CN115569483A - Self-holding one-step purification equipment and purification process - Google Patents

Abstract

The application discloses a self-sustaining one-step purification device and a purification process, which are used for purifying flue gas containing water vapor, ammonia gas and acidic pollutants; the purification equipment comprises a flue gas air inlet, a flue gas air outlet and a flue gas purification channel from the flue gas air inlet to the flue gas air outlet; the low-temperature condensation module is arranged in the flue gas purification channel and used for cooling and condensing the flue gas in the flue gas purification channel from the flue gas air inlet, condensing the water vapor into condensed water, dissolving the ammonia gas in the condensed water and generating acid-base neutralization reaction in the condensed water to generate salt which is soluble in non-volatile substances of the condensed water. The problem that ammonia escapes can effectively be solved to this application.

Description

Self-supporting one-step purification equipment and purification process

technical field

This application relates to the technical field of environmental protection equipment, in particular, to a self-sustaining one-step purification equipment and purification process.

Background technique

At present, the vast majority of cement kiln tail gas NOx treatment technologies still use ammonia source (ammonia water, urea, etc.) reducing agents. Air secondary pollution caused by ammonia escape phenomenon specified in national standard (less than 8mg/m3).

The known prior art discloses a recovery and circulation system and control method for escaped ammonia in the tail gas of cement kiln ammonia denitrification, and the system includes a spray tower, a heat exchanger, a storage tank, and a receiving tank. The denitrification tail gas in the flue is transported by the fan to the heat exchanger to cool down, and then enters the tower through the bottom of the spray tower; then the absorbent in the storage tank is pumped to the spray tower to contact and react with the bottom-up denitrification tail gas , to obtain ammonia-containing absorbent and de-ammonia tail gas; after that, the ammonia-containing absorbent flows into the receiving tank, and the supernatant after precipitation is recirculated into the spray tower and repeatedly contacted with the de-nitration tail gas until the saturated ammonia absorbent is formed; and the receiving tank The mud settled at the bottom of the tank is regularly pumped to the cement kiln; the saturated ammonia absorbent is pumped to the ammonia water storage tank, mixed with ammonia water for denitrification reaction, and the ammonium salt is decomposed into ammonia in the SNCR process as part of the ammonia source and Nitrogen oxide reaction, so as to realize the recycling of escaped ammonia.

Although this prior art can solve the problem of ammonia escape, the ammonia removal efficiency is low, the equipment volume is large, and the cost is high. The specific analysis is as follows:

1. The exhaust gas treatment in this prior art needs to be heat-exchanged and then sprayed before being collected and recycled. Many processing steps lead to complicated deamination process and low deamination efficiency.

2. The exhaust gas in the prior art can only achieve limited cooling through the heat exchanger before it enters the spray tower. Cooling the tail gas can improve the absorption efficiency of the spray tower for ammonia. On the other hand, the cooling treatment in front of the heat exchanger can reduce the working pressure of the spray tower, that is, reduce the spray water volume of the spray tower, but the spray tower is used to carry out Absorption of ammonia, the amount of spraying water is still huge, which also causes the receiving capacity of the follow-up receiving tank of the prior art to be large, the equipment volume is large, and the processing capacity for the ammonia-containing absorbent to circulate into the spray tower is huge.

3. The ammonia-containing absorbent in the prior art needs to settle for a long time when it flows into the receiving tank, which further reduces the ammonia removal efficiency in the prior art.

Therefore, on the whole, the recovery and circulation system of escaped ammonia in the prior art has the problems of complex process, low ammonia removal efficiency, large equipment volume, high cost and large amount of wastewater treatment.

Contents of the invention

The main purpose of this application is to provide a self-sustaining one-step purification equipment and purification process to solve the problems of complex process, low ammonia removal efficiency, large equipment volume and high cost in the purification equipment for escaped ammonia in the related art.

In order to achieve the above object, the first aspect of the present application provides a self-supporting one-step purification equipment for purifying flue gas containing water vapor, ammonia and acidic pollutants; the purification equipment includes:

a flue gas inlet and a flue gas outlet, and a flue gas purification channel from the flue gas inlet to the flue gas outlet;

A low-temperature condensation module, which is arranged in the flue gas purification channel, cools and condenses the flue gas entering the flue gas purification channel from the flue gas air inlet, and condenses the water vapor into condensed water, The ammonia gas and the acidic pollutants are dissolved in the condensed water, and an acid-base neutralization reaction occurs in the condensed water to form a non-volatile salt easily soluble in the condensed water.

Optionally, the low temperature condensation module is connected to the cooling water inlet and the cooling water return port; The end joint assembly at the upper and lower ends of the cooling water tube bundle, the end joint assembly together with the cooling water tube bundle constitutes a cooling water circulation pipeline for cooling water to flow from the cooling water inlet to the cooling water return port .

Optionally, the cooling water tube bundles are arranged in a forked tube bundle array.

Optionally, the cooling water tube bundle is divided into several cooling water tube areas along the flue gas flow direction, each of the cooling water tube areas includes multiple rows of cooling water tubes arranged along the flue gas flow direction, and the multiple rows of cooling water tubes Two adjacent rows of the cooling water pipes are arranged in a staggered manner in the flue gas flow direction and there is no gap between the orthographic projection planes.

Optionally, the three adjacent cooling water pipes in two adjacent rows of cooling water pipes form a triangular arrangement of cooling water pipe units, and the arrangement size range of the cooling water pipe units is:

C=1.8A～2A;

D=0.8B～1.5B;

Among them, A is the maximum width dimension of the pipe section; B is the maximum length dimension of the pipe section; C is the center distance dimension of the pipe section of two adjacent cooling water pipes in the same row; D is the center of the pipe section of the adjacent row of cooling water pipes pitch size.

Optionally, the cooling water pipe is an arc-shaped diamond cooling water pipe, and the arc-shaped rhombic cooling water pipe includes: a cooling water pipe body, the cross section of the cooling water pipe body is in the shape of an arc-arc rhombus, and the two ends of the short diagonal line are respectively It is a large arc end, and the two ends of the long diagonal are respectively small arc ends; the large arc ends at the two ends of the short diagonal are connected to the small arc ends at the two ends of the long diagonal respectively through straight edges , the straight side is tangent to the arc lines of the large arc end and the small arc end.

Optionally, the large arc ends at the two ends of the short diagonal are arranged concentrically.

Optionally, a line connecting the midpoints of the large arc ends at both ends of the short diagonal is perpendicular to a line connecting the small arc ends at both ends of the long diagonal.

Optionally, both the large arc end and the small arc end include an inner fillet and an outer fillet.

Optionally, the applicable ranges of the dimensions of the cross-section of the cooling water pipe body are as follows:

A=20～100mm;

B=A～2A;

R ₁ =1/2×A;

R ₂ =R ₁ -t;

r ₁ =6～1/2×R ₁ ;

r ₂ =r ₁ -t;

Wherein, A is the short diagonal length of the cooling water pipe body 1020; B is the long diagonal length of the cooling water pipe body 1020; R1 is the outer diameter _of the large arc end _; R2 is the inner diameter of the large arc end; is the wall thickness of the cooling water pipe body 1020; r ₁ is the outer diameter of the small arc end; r ₂ is the inner diameter of the small arc end.

Optionally, the arc-shaped rhombic cooling water pipe also includes an upper joint and a lower joint respectively provided at both vertical ends of the cooling water pipe body; wherein, the upper joint and the lower joint have the same structure, and both include plugs and joints, The plug is sealed and fixed at both vertical ends of the cooling water pipe body, the first end of the joint is sealed and fixed on the plug and communicates with the interior of the cooling water pipe body, and the second end extends out of the cooling water pipe body. Said plug.

Optionally, the cross-section of the plug is set in the same arc rhombus shape as the cross-section of the cooling water pipe body, and a joint installation hole is opened on the plug along its axial direction; the first of the joint An end seal is secured within the fitting mounting hole.

Optionally, an annular groove is provided in the joint installation hole, and a sealing ring is embedded in the annular groove, and the joint is screwed into the joint installation hole and the sealing ring is pressed against the annular groove Inside.

Optionally, the end joint assembly includes an upper end joint assembly and a lower end joint assembly, and the upper end joint assembly and the lower end joint assembly pass along the flue gas above and below the cooling water tube bundle The directions are arranged alternately in sequence, and each end joint passes through the ends of multiple rows of cooling water pipes to form a parallel pipeline for at least two rows of parallel water flows to flow in the same direction in the cooling water tube bundle.

Optionally, the upper end assembly is an upper water tank, the lower end assembly is a lower water tank, and the upper end assembly includes a plurality of end pipes arranged above the cooling water tube bundle along the flue gas flow direction. The upper water tank sub-section of the end joint, the lower water tank includes a plurality of lower water tank sub-sections as the end joints arranged below the cooling water tube bundle along the flue gas flow direction, each water tank sub-section penetrates The multiple rows of cooling water pipes include water inlet pipes and water outlet pipes arranged side by side along the flue gas flow direction, and the number of rows of the water inlet pipes and the water outlet pipes is the same.

Optionally, one of the upper water tank and the lower water tank further includes a cooling water inlet tank communicated with the cooling water inlet, and the other further includes a cooling water return tank communicated with the cooling water return port, so The cooling water inlet tank and the cooling water return tank are respectively connected with at least two rows of cooling water pipes.

Optionally, the cooling water tube bundle is divided into multiple cooling water tube areas along the flue gas flow direction, each of the cooling water tube areas includes multiple rows of cooling water tubes arranged along the flue gas flow direction, and each of the cooling The water pipe sections communicate with a group of the cooling water inlets and the cooling water return ports correspondingly, and the cooling water flows between the multiple cooling water pipe sections are not connected in the cooling water tube bundle.

Optionally, the cooling water flow rate of the cooling water pipe area near the flue gas outlet is smaller than the cooling water flow rate of the cooling water pipe area near the flue gas air inlet.

Optionally, there are three cooling water pipe areas, and the cooling water flow in the cooling water pipe areas decreases sequentially along the flue gas flow direction.

Optionally, a cooling water inlet main pipe is also included, and the cooling water inlet main pipe communicates with each of the cooling water inlets through a flow regulating valve.

Optionally, the upper end assembly is an upper water tank that penetrates the upper ends of all cooling water pipes, the lower end assembly is a lower water tank that penetrates the lower ends of all cooling water pipes, and one of the upper water tank and the lower water tank communicates with the The cooling water inlet is connected to the cooling water return port.

Optionally, the cooling water flow in the cooling water pipe area from the flue gas inlet to the flue gas outlet decreases sequentially.

Optionally, the upper end component is an upper water tank that runs through the upper ends of all cooling water pipes, and the lower end component is a lower water tank, and the lower water tank includes a plurality of lower water tank subsections arranged along the flue gas circulation direction Each of the lower water tank subsections is connected with multiple rows of cooling water pipes; the upper water tank is connected with a cooling water return port, and each of the lower water tank subsections is connected with a cooling water inlet.

Optionally, a cooling water inlet main pipe is also included, and the cooling water inlet main pipe communicates with each of the cooling water inlets through a flow regulating valve.

Optionally, the end joint assembly is a round pipe elbow assembly that sequentially connects ends of two adjacent cooling water pipes.

Optionally, the cooling water tube bundle is divided into several cooling water tube areas along the flow direction of the flue gas, each of the cooling water tube areas includes multiple rows of cooling water pipes arranged along the flow direction of the flue gas; each of the cooling water tubes The zone is connected to a collection pipe and a return pipe.

Optionally, it also includes a box, the two sides of the box are provided with the flue gas inlet and the flue gas outlet; the upper box plate and the lower box plate of the box are provided with The water pipe installation holes at the upper end and the lower end of the cooling water pipe bundle, the hole wall of the water pipe installation hole is provided with an annular groove along its circumference; the end of the cooling water pipe is arranged in the water pipe installation hole, and the cooling The part of the water pipe body corresponding to the annular groove is provided with an annular protrusion, and the annular protrusion is sealed and embedded in the annular groove so that the end of the cooling water pipe body and the water pipe installation hole form a curved surface seal.

Optionally, a sealant is provided in the annular groove.

Optionally, the annular groove is arranged coaxially with the water pipe installation hole.

Optionally, a rubber gasket is also provided in the annular groove, and the annular protrusion presses the rubber gasket into the annular groove.

Optionally, the annular groove includes a plurality of grooves arranged at intervals along the circumference of the hole wall of the water pipe installation hole, and the extension depths of the plurality of grooves on the hole wall are the same or different.

Optionally, multiple annular grooves are provided and distributed along the axial direction of the water pipe installation hole.

Optionally, two annular grooves are provided, including a first annular groove and a second annular groove, and the groove opening direction of the first annular groove is different from that of the groove of the second annular groove. The opening direction is inclined in the opposite direction on the axial direction of the water pipe installation hole; correspondingly, the annular protrusion includes a first annular protrusion and a second annular protrusion, and the first annular protrusion and the second annular protrusion The protrusions of the annular protrusions are inclined in opposite directions in the axial direction of the water pipe installation hole.

Optionally, the cooling water pipe body is further provided with two ring-shaped snap-in protrusions, the two ring-shaped snap-in protrusions are located on the inner side and the outer side of the installation base, and the two ring-shaped snap-in protrusions The opposite surfaces respectively abut against the inner surface and the outer surface of the installation foundation.

Optionally, it also includes several defogging and water-collecting baffles arranged vertically at the flue gas outlet, and the surface of the defogging and water-collecting baffles is a curved surface.

Optionally, at least part of the demisting and water-collecting baffle is formed with vertically extending oblong holes along the surface of the demisting and water-collecting baffle.

Optionally, it also includes a steel wire mesh arranged on the outside of the defogging and water-collecting baffle.

Optionally, the air temperature of the flue gas at the flue gas inlet is 70°C-170°C, the moisture content of the flue gas is 5%-10%, the escape ammonia is 9mg/m ³ -200mg/m ³ , the cooling water inlet temperature 26°C-32°C, SO ₂ content 5mg/m ³ -100mg/m ³ , NOx content 30mg/m ³ -60mg/m ³ , CO ₂ concentration 18%-22%, dust content 5mg/m ³ -15 mg/m ³ ;

The air temperature of the flue gas at the flue gas outlet is 30°C-50°C, the water content of the flue gas is 3%-6%, and the escape ammonia is 0mg/m ³ -7mg/m ³ .

Optionally, an atomizing device is also included, which is arranged at the air inlet of the flue gas, and sprays water toward this position to increase the water content in the flue gas.

Optionally, chemicals for deammonization and/or desulfurization and/or denitrification are added to the atomized water of the atomization device.

Optionally, it also includes a spray cleaning device, which is arranged at the air inlet of the flue gas, and is used for spraying cleaning water into the flue gas, and the cleaning water scours the cooling water pipe of the low-temperature condensation module along with the flue gas. Surface to wash away the particles bonded to the surface of the water pipe.

Optionally, the box body includes an upper box plate, a lower box plate, a front box plate and a rear box plate, the upper box plate is sealed with the front box plate and the rear box plate, and the lower box plate is connected with the front box plate and the rear box plate. The box plates are sealed and connected together to form the upper, lower, front and rear seals of the low-temperature condensation module, and the left and right directions of the purification equipment are the flue gas inlet and the flue gas outlet.

Optionally, it also includes a condensed water collecting device arranged at the bottom of the low-temperature condensing module for collecting the condensed water, and the condensed water collecting device is connected to a condensed water discharge port.

Optionally, the acidic pollutants include at least one of sulfur dioxide, carbon dioxide and NOx.

The second aspect of the present application also provides a purification process of the above-mentioned self-sustaining one-step purification equipment, including the following steps:

Install the self-supporting one-step purification equipment to the flue gas outlet of the flue gas discharge equipment to be purified, so that the flue gas air inlet of the self-supporting one-step purification equipment is connected to the flue gas discharge equipment of the equipment to be purified. Flue gas outlet sealed connection;

Start the self-sustaining one-step purification equipment to work, by cooling the flue gas, the water vapor in the flue gas is condensed into condensed water, and the ammonia gas and acidic pollutants contained in the flue gas are dissolved in the An acid-base neutralization reaction occurs in the condensed water to generate a non-volatile salt that is easily soluble in the condensed water.

Description of drawings

The accompanying drawings, which constitute a part of this application, are included to provide a further understanding of the application and make other features, objects and advantages of the application apparent. The drawings and descriptions of the schematic embodiments of the application are used to explain the application, and do not constitute an improper limitation to the application. In the attached picture:

Fig. 1A is a schematic flow chart of the self-sustaining one-step purification process of the embodiment of the present application;

Fig. 1B is a schematic structural view (front view) of the self-supporting one-step purification equipment of the embodiment of the present application;

Figure 1C is a top view of Figure 1B;

Fig. 1 D is the structural diagram (front view) of the self-supporting one-step purification equipment of the embodiment of the present application;

Figure 1E is a side view of Figure 1D;

Fig. 2A is the structural representation (front view) of the self-supporting one-step purification equipment (circular tube) of the embodiment of the present application;

Figure 2B is a top view of Figure 2A;

Fig. 2C is a structural diagram (front view) of the self-supporting one-step purification equipment (circular tube grouping) of the embodiment of the present application;

Figure 2D is a top view of Figure 2C;

2E is a perspective view of the self-sustaining one-step purification equipment (circular tube grouping) of the embodiment of the present application;

Fig. 3A is the front view of the low-temperature condensation module (cooling water circulates along the grouping water pipe) of the embodiment of the present application;

Figure 3B is a top view of Figure 3A;

Figure 3C is a left side view of Figure 3A;

Fig. 3D is a three-dimensional cross-sectional view of the low-temperature condensation module (cooling water circulates along the grouped water pipes) of the embodiment of the present application;

Fig. 4A is the front view of the low-temperature condensation module of the embodiment of the present application (straight-through cooling water in each zone circulates along the grouping water pipes and the amount of cooling water is adjustable);

Figure 4B is a top view of Figure 4A;

Fig. 4C is a left view of the low-temperature condensation module of the embodiment of the present application (straight-through cooling water in each zone circulates along the grouping water pipes and the amount of cooling water is adjustable);

Fig. 5A is the front view of the low-temperature condensation module (straight-through type with adjustable cooling water in each zone) of the embodiment of the present application;

Figure 5B is a top view of Figure 5A;

Figure 5C is a left side view of Figure 5A;

Fig. 6A is the front view of the low-temperature condensation module of the embodiment of the present application (straight-through cooling water in each zone circulates along the grouping water pipes and the cooling water volume is adjustable);

Figure 6B is a top view of Figure 6A;

Figure 6C is a left side view of Figure 6A;

Fig. 6D is a three-dimensional cross-sectional view of the low-temperature condensation module of the embodiment of the present application (straight-through cooling water in each zone circulates along the grouping water pipes and the cooling water volume is adjustable);

Fig. 7A is a top view of the arc rhomboid tube of the embodiment of the present application;

Fig. 7B is a front view of the arc rhomboid tube of the embodiment of the present application;

Fig. 7C is a cross-sectional view of a circular rhomboid tube according to an embodiment of the present application;

Fig. 8 is a diagram of the arrangement of arc rhomboid tubes according to the embodiment of the present application;

Fig. 9A is the front view of the arc rhomboid tube expander of the embodiment of the present application;

Fig. 9B is a partially enlarged view of Fig. 9A;

Fig. 10A is the rear front view of the arc rhomboid tube expanded in the embodiment of the present application;

Figure 10B is a partially enlarged view of Figure 10A;

Figure 10C is a top view of Figure 10A;

Fig. 11A is a front view of the modular self-supporting one-step purification equipment of the embodiment of the present application;

Figure 11B is a top view of the modular self-supporting one-step purification equipment of the embodiment of the present application;

Fig. 11C is a left view of the modularized self-sustaining one-step purification equipment of the embodiment of the present application;

Fig. 12 is a schematic structural diagram of a defogging and water-collecting baffle according to an embodiment of the present application;

FIG. 13 is a simplified schematic diagram of the convective heat transfer of the low temperature condensation module of the embodiment of the present application.

Among them, 1 low-temperature condensing module, 101 box body, 1011 upper box plate, 1012 lower box plate, 1013 front box plate, 1014 rear box plate, 102 cooling water tube bundle, 102a cooling water pipe, 1020 cooling water pipe body, 1020b large arc end , 1020a small arc end, 1020c straight edge, 1022 plug, 103 cooling water inlet pipe, 1031 flow regulating valve, 1032 cooling water inlet main pipe, 1033 water distribution pipe, 104 cooling water return pipe, 105 round pipe elbow, 2 Spray device, 3 atomization device, 4 flue gas inlet, 5 flue gas outlet, 9 water pump, 10 condensed water discharge port, 11 upper water tank, 111 upper water tank division, 12 lower water tank, 121 lower water tank division, 13 defogging water collection water retaining plate, 14 steel wire mesh, 15 rubber gasket, 16 sealant, 17 annular groove, 18 annular protrusion, 19 annular clamping protrusion, 20 installation base, 21 lower joint, 211 plug , 212 sealing ring, 213 joint, 22 upper joint, 23 condensate collection device, 24 cooling water pipe area, 103a cooling water inlet, 104a cooling water return port, 102b water pipe installation hole.

detailed description

In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is an embodiment of a part of the application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

It should be noted that the terms "first" and "second" in the description and claims of the present application and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It should be understood that the data so used may be interchanged under appropriate circumstances for the embodiments of the application described herein.

In the present application, the orientation or positional relationship indicated by the terms "upper", "lower", "inner", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation.

Moreover, some of the above terms may be used to indicate other meanings besides orientation or positional relationship, for example, the term "upper" may also be used to indicate a certain attachment relationship or connection relationship in some cases. Those skilled in the art can understand the specific meanings of these terms in this application according to specific situations.

Furthermore, the terms "disposed", "provided", "connected", "fixed", etc. are to be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediary, or two devices, components or Internal connectivity between components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

In addition, the term "plurality" shall mean two or more than two.

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

At present, the vast majority of high-temperature flue gas treatment, such as cement kiln flue gas NOx treatment technology, still uses ammonia source (ammonia water, urea, etc.) reducing agent. Due to the limitation of denitration rate, there are more or less excessive use of reducing agent. The air secondary pollution caused by ammonia escape phenomenon exceeding or even seriously exceeding the national standard (less than 8mg/m ³ ).

The known prior art discloses a recovery and circulation system and a control method for escaped ammonia in the flue gas of cement kiln ammonia denitrification, and the recovery and circulation system includes a spray tower, a heat exchanger, a storage tank, and a receiving tank. The denitrification flue gas is first transported by the fan to the heat exchanger to cool down, and then enters the tower through the bottom of the spray tower, and then the absorbent in the storage tank is pumped to the spray tower to contact and react with the denitrification flue gas from bottom to top. The ammonia-containing absorbent and the denitrification flue gas, after which the ammonia-containing absorbent flows into the receiving tank, and the supernatant after precipitation is recirculated into the spray tower and repeatedly contacted with the denitrification flue gas until the saturated ammonia absorbent is formed, and the receiving tank The mud settled at the bottom of the tank is regularly pumped to the cement kiln. The saturated ammonia absorbent is pumped to the ammonia water storage tank and mixed with ammonia water for denitration reaction. The ammonia salt is denitrated in the SNCR (selective non-catalytic reduction) process. Ammonia is decomposed as part of the ammonia source to react with nitrogen oxides, thereby realizing the recycling of escaped ammonia.

Although this prior art can solve the problem of ammonia escape, it has the defects of low ammonia removal efficiency, large equipment volume, and high cost. The specific analysis is as follows:

1. The flue gas treatment in this prior art needs heat exchange first, then spraying, and then collecting and recycling. Many processing steps lead to complex deamination process and low deamination efficiency. Due to the complex process, heat exchangers, spraying The leaching tower, storage tank, receiving tank, etc. lead to large volume and high cost of the overall deammonization equipment.

2. This prior art discloses that the flue gas is first transported to the heat exchanger to cool down, but from the understanding of the entire technical solution disclosed in the prior art, it can be concluded that the prior art uses a pre-heat exchanger to cool the flue gas On the one hand, the purpose is to avoid that the volatile high-temperature ammonia is not easily absorbed by the absorbent in the subsequent spray tower process, and the limited cooling of the high-temperature flue gas through the pre-heat exchanger can improve the ammonia resistance of the spray tower. Absorption efficiency, on the other hand, the pre-cooling of high-temperature ammonia through the heat exchanger can reduce the working pressure of the spray tower, but the existing technology still uses the spray tower, which shows that the means of solving the problem of ammonia escape in the prior art is still traditional The idea of ammonia absorption in the spray tower, but the use of the spray tower has the problem of a large amount of spray water and a large amount of subsequent sewage purification and treatment.

3. In the prior art, it takes a long time for the ammonia-containing absorbent to flow into the receiving tank, which further leads to the low efficiency of ammonia removal in the prior art.

Therefore, on the whole, the recovery and circulation system of escaped ammonia in the prior art has the problems of complex process, low ammonia removal efficiency, large equipment volume, high cost and large amount of wastewater treatment.

In order to solve the problems of ammonia escape and the deamination system in the known prior art with complex process, low deamination efficiency, large equipment volume, high cost and large amount of wastewater treatment, the application proposes a kind of composition in the flue gas to be treated that can Self-contained physical and chemical reactions to realize ammonia absorption (self-sustaining), small equipment size (compact), simple process (one-step method), low cost, and self-sustaining one-step purification equipment and purification methods with small wastewater treatment volume. The purification equipment provided in this application can not only be applied to the scene of cement kiln flue gas purification, but also can be applied to scenes such as power plant or coal yard flue gas purification. However, it should be noted that the purification equipment provided in this application can only be applied to the purification treatment of flue gas containing water vapor, ammonia gas, and acid pollutants.

As a preferred embodiment of this application, the purification equipment is applied to the purification of cement kiln ammonia denitrification flue gas. At present, ammonia escape is common in cement kiln flue gas. The flue gas emitted by cement kiln is high temperature, containing water vapor, ammonia gas and acid pollutants.

The purification device in this embodiment has a flue gas inlet 4, a flue gas outlet 5, and a flue gas purification channel from the flue gas inlet 4 to the flue gas outlet 5, and the purification device also includes a low-temperature condensation module 1, The low-temperature condensation module 1 is arranged in the flue gas purification channel.

The main structure of the above-mentioned purification equipment can realize the purification treatment of cement kiln flue gas. The purification principle is as follows:

The cement kiln flue gas enters the flue gas purification channel from the flue gas inlet 4 of the purification equipment, and the low-temperature condensation module 1 in the flue gas channel cools and condenses the incoming flue gas to cool and condense the water vapor in the flue gas As condensed water (ideally, it is hoped that all the water vapor will be condensed into condensed water), the self-contained ammonia gas and acidic pollutants (such as SO2 and CO2) in the flue gas are dissolved in the condensed water (physical purification), which is The first layer of purification achieved by the purification equipment of this application, but due to the high temperature of the flue gas, the ammonia gas or acidic pollutants dissolved in condensed water are easy to volatilize from the condensed water, but the innovation of the purification equipment of this application is that ammonia Gas and acidic pollutants are dissolved in condensed water to undergo acid-base neutralization (chemical purification) to form non-volatile salts that are easily soluble in condensed water.

The low-temperature condensation module 1 in the purification equipment of the present application can be of various types, such as oil-immersed self-cooling low-temperature condensation, refrigerated low-temperature condensation, and the like. As a preferred embodiment of the present application, the low-temperature condensation module 1 adopts water-cooled low-temperature condensation. The purification equipment is provided with a cooling water inlet 103a and a cooling water return port 104a, and the low-temperature condensation module 1 is connected to the cooling water inlet 103a and the cooling water return port 104a. The low-temperature condensation module 1 includes cooling water tube bundles 102 vertically arranged in the flue gas purification channel and arranged in an array, and end joint assemblies connected to the upper and lower ends of the cooling water tube bundle 102, the end joints The components together with the cooling water tube bundle 102 form a cooling water circulation pipeline for cooling water to flow from the cooling water inlet to the cooling water return port.

After the flue gas enters the flue gas purification channel from the flue gas air inlet 4, it fully contacts with the surface of the cooling water tube bundle 102 flowing with cooling water, and the water vapor in the flue gas condenses on the surface of the water pipes of the cooling water tube bundle 102 into condensed water , flows along the surface of the cooling water pipe to the bottom of the purification equipment. Since the cooling water in the present application is not in direct contact with the flue gas, the cooling water in the cooling water tube bundle 102 is not polluted and can be recycled after cooling down. And after calculation, the cooling water consumption and consumption of the cooling water tube bundle 102 are far less than the water consumption and consumption in the spray tower in the prior art, and the condensed water of this purification equipment can completely make up for the cooling water after purification and recovery. The amount of volatilized water in the cooling process of water.

Fig. 1B shows the working principle of the purification equipment of the present application. The purification equipment of the present application can be used in conjunction with the water pump 9, the cooling water circulation pipeline and the cooling tower. The water pump 9 provides driving force to the cooling water that enters from the cooling water inlet 103a through the cooling water inlet pipeline 103 of the cooling water circulation pipeline, and the cooling water flows in the cooling water circulation pipeline, and then flows out from the cooling water outlet 104a into the In the cooling tower, the water in the cooling tower flows back to the water pump 9 to realize cooling water circulation. The cement kiln flue gas enters the interior of the low-temperature condensation module 1 through the flue gas inlet 4 of the low-temperature condensation module 1 to fully exchange heat with the cooling water tube bundle 102. The cooling water tube bundle 102 quickly cools the flue gas. The water vapor of the flue gas is condensed into condensed water when the temperature is lowered, and the condensed water absorbs the alkaline ammonia molecules (ammonia gas), cement raw meal dust (containing calcium) and the acidic SO ₂ contained in the flue gas. with _CO2 and other gases. Alkaline ammonia molecules and cement raw meal dust, and acidic SO2 and _CO2 undergo acid _- base neutralization reaction in condensed water to form non-volatile salts such as ammonium bisulfate, ammonium bicarbonate, calcium sulfate and calcium carbonate .

The purification equipment of the present application also includes a condensed water collecting device 23 , which is arranged at the bottom of the low-temperature condensing module 1 , and the condensed water collecting device 23 is connected to the condensed water discharge port 10 . The condensed water produced on the surface of the cooling water tube bundle 102 flows along the surface of the water pipes to the bottom of the purification equipment, and then is collected by the condensed water collecting device 23 , and finally the condensed water is discharged from the condensed water discharge port 10 .

Further, the drained condensed water can be treated by membrane separation method into recycled or drained purified water (about 90%) and about 10% salty high-concentration water (salt dust content is less than 3%), high salt content Concentrated water is pumped and sprayed into the clinker grate cooler at the kiln head of the cement kiln. On the one hand, the clinker can be cooled rapidly; The ammonia salt is decomposed into ammonia and SO ₂ by the clinker rapid heating, and then enters the decomposition furnace of the cement kiln with the tertiary air, in which the ammonia molecule is used for denitrification in the decomposition furnace, and the SO ₂ reacts with CaO to form calcium sulfate and enters the clinker , There is no secondary pollution in the whole process, and all substances are recycled.

In the prior art known above, although it also discloses the use of heat exchangers to cool down the denitration flue gas, the role of the heat exchangers in the above prior art is the same as that of the low-temperature condensation module 1 in this application. The function in is completely different. The specific difference is:

1. Different invention concepts

The above-mentioned prior art mainly uses the spray tower to spray the absorbent for deamination, and the purpose of setting the heat exchanger is to reduce the load of the spray tower; this application utilizes the characteristic of water vapor contained in the flue gas of the cement kiln, through low temperature The condensation module 1 cools and condenses the water vapor in the high-temperature flue gas into condensed water. Acidic gases such as ammonia, SO ₂ and CO ₂ are easily dissolved in the condensed water in the low-temperature environment of the low-temperature condensation module 1 (physical process), and present The basic ammonia molecule neutralizes the acidic and alkaline substances in the acidic SO ₂ and CO ₂ to form non-volatile substances such as ammonium bisulfate, ammonium bicarbonate, calcium sulfate and calcium carbonate (chemical process). exhaust, so that the problem of ammonia escape in cement kilns is effectively solved; in this application, the deamination reaction occurs directly in the heat exchanger without adding any absorbent.

2. The function of the above-mentioned prior art heat exchanger is objectively different from that of the low-temperature condensation module 1 of the present application

1) Although the prior art records that the heat exchanger can cool the flue gas to 50 degrees, it does not disclose that the deammonization is carried out in the heat exchanger. From the full text of the prior art, the heat exchanger does not have Deamination, this is because, starting from the concept of the invention, the denitrification flue gas after being cooled by the heat exchanger enters the spray tower, and the spray tower realizes ammonia absorption by spraying the absorbent. For the designer, it is not necessary Ammonia absorption will be deliberately divided into two steps, that is, ammonia absorption in the heat exchanger part, and ammonia absorption in the subsequent spray tower, which will only increase the difficulty of ammonia recovery;

2), starting from the inventive concept of the prior art, the heat exchanger does not need to play a role in deamination, because it needs to be deaminized by spraying the absorbent. If the heat exchanger can achieve deamination, it does not need to be treated by a spray tower .

3) It is very important that for traditional heat exchangers, the general pursuit is to minimize the generation of condensed water during the heat exchange process, because the condensed water will corrode the pipeline of the heat exchanger for a long time, resulting in The service life of the heat exchanger is reduced, so it can be concluded that this prior art heat exchanger is also not aimed at generating condensed water.

3. There are many defects in the above-mentioned known prior art

1) There is a risk of absorbent escape. The ammonia absorbent used is formic acid. The volatilization and escape of the absorbent also need further treatment, and formic acid is also a flammable substance;

2) The amount of waste water after the absorbent absorbs ammonia is large, and the treatment cost is high;

3) Since the way of spraying the absorbent cannot make full use of the absorbent, in order to improve the utilization rate of the absorbent, the absorbent has to be recycled, which not only requires a long precipitation period, but also the return pipeline for the long-term circulation will suffer severe corrosion, The plan is difficult to implement;

4) It is difficult to detect whether the absorbent is saturated, and it is easy to cause ammonia escape due to invalid absorption.

The purification equipment of the present application is different from the heat exchanger of the prior art, because the applicable scene of the purification equipment of the present application is limited to the purification of flue gas containing water vapor, ammonia and acidic pollutants, and the pursuit of More condensed water is used to realize the purification of physical and chemical processes, which is completely different from the existing heat exchanger concept. In addition, the purification equipment of the present application realizes self-sustaining, one-step deamination, and has the advantages of simple deamination process, small equipment volume and low cost.

In addition, the purification equipment of this application is not only suitable for deamination, because in the condensed water produced by the low-temperature condensation module 1, alkaline ammonia, cement raw meal dust and acidic SO ₂ , CO ₂ , NOx and other acids in the flue gas Alkaline substances undergo a neutralization reaction, so the purification equipment of this application can also be used for removing SO ₂ , removing CO ₂ and removing NOx.

The cooling water tube bundle 102 of the low temperature condensation module 1 of the present application is arranged in a forked tube bundle array. Specifically, as shown in FIG. 2B , the cooling water tube bundle 102 includes multiple rows of cooling water pipes 102a arranged along the direction of flue gas flow, two adjacent rows of cooling water pipes 102a are arranged alternately in the direction of flue gas flow There is no gap between the orthographic planes.

As a preferred embodiment of the present application, the orthographic projection planes of two adjacent rows of cooling water pipes 102a in the plurality of rows of cooling water pipes 102a in the flue gas flow direction intersect. This arrangement makes the flue gas that enters the flue gas purification channel meander in the gap of the cooling water tube bundle 102, increases the heat exchange contact area between the flue gas and the cooling water tube bundle 102 as much as possible, and can ensure the normal flow of the flue gas. The circulation will not affect the purification treatment of the continuous new incoming flue gas.

As a modification of the arrangement of the cooling water tube bundles 102, in other embodiments, the boundaries of the orthographic projection planes of two adjacent rows of cooling water tubes 102a in the flow direction of the flue gas among the multiple rows of cooling water tubes 102a coincide. That is, the maximum width of one cooling water pipe 102a in the previous row is just equal to the width of the gap between two adjacent cooling water pipes 102a in the latter row. This arrangement can also avoid the situation that part of the flue gas directly passes through the gaps between two adjacent rows of cooling water pipes 102a in the front and back directions without contacting the surface of the cooling water pipes 102a to exchange heat.

In this application, the cooling water pipe 102a may be in the shape of a round pipe, an elliptical pipe, a rectangular pipe, or a diamond pipe. However, considering how to realize that the resistance encountered by the flue gas in the cooling water tube bundle 102 is as small as possible, the heat exchange contact area between the flue gas and the cooling water tube bundle 102 is as large as possible, and the heat exchange efficiency between the cooling water pipe 102 and the flue gas is as high as possible. , the shape of the cooling water pipe 102 needs to be finely designed.

For this reason, as a preferred embodiment of the present application, a circular-arc diamond-shaped cooling water pipe is proposed, as shown in Figures 7A-7C, the circular-arc diamond-shaped cooling water pipe includes: a cooling water pipe body 1020, the cross section of which is a circular arc In a rhombus shape, the two ends of the short diagonal of the cross section of the cooling water pipe body 1020 are respectively large arc ends 1020b, and the ends of the long diagonal are respectively small arc ends 1020a;

The large arc ends 1020b at both ends of the short diagonal are connected to the small arc ends 1020a at both ends of the long diagonal through straight edges 1020c, and the straight edges 1020c are tangent to the arc of the large arc ends 1020b.

As shown in Figures 7A-7C, the radius of curvature of the large arc end 1020b is much larger than the radius of curvature of the small arc end 1020a, that is, the curvature of the large arc end 1020b is much smaller than the curvature of the small arc end 1020a, because the small arc end 1020a has a large curvature and forms an acute angle with two straight sides 1020c.

The cooling water pipe body 1020 is in the shape of a strip, and its interior is a hollow structure, which can be used for cooling water flow. When the cooling water pipe 102a is used in a low-temperature condensing device, the small arc end 1020a of the cooling water pipe body 1020 is arranged horizontally along the direction from the flue gas inlet 4 to the flue gas outlet 5, that is, horizontally arranged along the left and right directions of the low-temperature condensing device, The line connecting the midpoints of the two large arc ends 1020b is perpendicular to the line connecting the two small arc ends 1020a, that is, the two large arc ends 1020b are arranged horizontally along the front and rear directions of the cryogenic condensing device.

In the embodiment of the present application, the cooling water pipe body 1020 whose cross-section is arc-shaped and diamond-shaped is defined as an arc-arc diamond-shaped pipe. Large heat transfer contact area, smaller flue gas resistance. The specific analysis is as follows:

Compared to a round tube:

The length of the short diagonal of the arc rhomboid tube is the same as the diameter of the original circular cooling water pipe, while the length of the long diagonal is greater than the diameter of the original circular cooling water pipe, so that the surface area of the improved arc rhomboid tube at both ends is relatively Because the surface area of the original circular cooling water pipe is larger, the contact area between the cooling water pipe and the flue gas of the cement kiln is increased, that is, the heat exchange area is increased.

In addition, since the radius of curvature of the small arc end 1020a of the cooling water pipe body 1020 is much smaller than the curvature radius of the large arc end, that is, the two ends of the cooling water pipe body 1020 form a small acute angle, compared to the shape of the two ends of the circular cooling water pipe In other words, the cooling water pipe body 1020 in the shape of arc rhombus will have smaller wind resistance at both ends, so the arc rhombus shape can achieve lower drag than the circle shape.

Compared with oval tube:

Compared with the elliptical tube, the arc rhomboid tube has two differences. The first difference is that the large arc end 1020b and the small arc end 1020a in the cooling water pipe body 1020 of the present application are connected by a straight edge 1020c, while the elliptical tube is Connected by arc edges. When the two cooling water pipes 102a are arranged in a staggered arrangement, the flow space formed between the two elliptical pipes has a structure in which both ends are large and the middle is small, while the flow space formed between the two arc rhombic pipes is more flat in size, Therefore, the flow of the exhaust gas is more favorable, and the influence on the flow of the exhaust gas caused by the change of the size of the flow space can be avoided.

The second difference is that in this application, in order to form a circular rhombus structure, in the case that the large circular arc end 1020b with a large curvature radius is uniform in size, the curvature radius of the other small circular arc end 1020a must be larger than that of the circular arc. The rhomboid tube, therefore, makes the arc rhombus tube have smaller wind resistance at both ends than the elliptical tube, and can also achieve the technical effect of reducing drag.

Compared with conventional diamond tubes:

Compared with the rhomboid tube, the cross-sectional shape of the circular rhomboid tube is equivalent to replacing the upper and lower sharp corners of the rhomboid tube cross section with a large arc end 1020b with a small curvature, and the left and right sharp corners Replaced with small arc ends of high curvature. The upper and lower ends of the arc rhomboid tube are large arc ends 1020b. Compared with the obtuse ends of the upper and lower ends of the rhombus tube, the use of arc transition can make the flow of smoke more stable. In addition, the left and right sharp corners are replaced by The small arc end with large curvature can prevent the smoke from flowing out at the rear end.

In addition, the rhombic tube with sharp corners at the left and right ends will cause excessive deformation at the left and right ends, which is prone to breakage, and due to structural limitations, the thickness at both ends of the rhomboid tube is generally greater than the thickness of other parts, resulting in cooling water in the rhomboid tube. The heat conduction path increases at both ends, which reduces the heat transfer efficiency. However, if the structure is set as a small arc, the thickness of the two ends of the arc rhomboid tube is close to the thickness of other parts, so that the heat conduction path of the cooling water at both ends will not be increased, and the heat exchange efficiency will not be affected.

This embodiment achieves the purpose of increasing the heat exchange area at both ends of the cooling water pipe body 1020, and using the large arc end 1020b and the small arc end 1020a to reduce the resistance encountered when the cement kiln exhaust gas flows, so that the cement kiln exhaust gas flows smoothly, thereby achieving In order to increase the contact area between the cement kiln exhaust gas and the cooling water pipe body 1020, and make the cement kiln exhaust gas flow smoothly, the technical effect of improving the cooling efficiency of the cement kiln exhaust gas is solved, and the cooling water pipe in the related art has a small heat exchange area. Moreover, the resistance to the flow of cement kiln exhaust gas is relatively large, and the cooling efficiency of cement kiln exhaust gas cannot be improved very well.

The line connecting the midpoints of the large arc ends 1020b at both ends of the short diagonal is perpendicular to the line connecting the small arc ends 1020a at both ends of the long diagonal.

Both the large arc end 1020b and the small arc end 1020a include inner fillets and outer fillets. In order to avoid the problem that the thickness of the cooling water pipe body 1020 changes due to the setting of rounded corners at the upper and lower ends and the left and right ends, in this embodiment, the inner rounded corners and outer rounded corners of the large arc end 1020b are set concentrically, and the small arc end 1020b is set concentrically. The inner and outer fillets of 1020a are arranged concentrically.

Since the size design of the cross-section of the cooling water pipe body 1020 still has a great influence on the heat exchange efficiency, in order to make reasonable use of the space and improve the heat exchange efficiency, in this embodiment, the dimensions of the cross-section of the cooling water pipe body 1020 are applicable to The scope is as follows:

A=20～100mm;

B=A～2A;

R ₁ =1/2×A;

R ₂ =R ₁ -t;

r ₁ =6～1/2×R ₁ ;

r ₂ =r ₁ -t;

Wherein, A is the short diagonal length of the cooling water pipe body 1020; B is the long diagonal length of the cooling water pipe body 1020; R1 is the outer diameter _of the large arc end 1020b _; R2 is the diameter of the small arc end 1020a Inner diameter; t is the wall thickness of the cooling water pipe body 1020; r ₁ is the outer diameter of the small arc end 1020a; r ₂ is the inner diameter of the large arc end 1020b.

Since the cooling water pipe 102a in this application is an arc-shaped diamond pipe, it is more difficult to install than a circular pipe, and it is difficult to ensure the sealing of its connection, and it is not convenient to connect with the water inlet and return pipes. connect. Therefore, the cooling water pipe 102a provided in this embodiment also includes an upper joint 22 and a lower joint 21 respectively arranged at both ends of the cooling water pipe body 1020; wherein, the upper joint 22 and the lower joint 21 have the same structure, and both include a plug 211 and a joint 213, The plug 211 is sealed and fixed on both ends of the cooling water pipe body 1020 , the first end of the joint 213 is sealed and fixed on the plug 211 and communicates with the interior of the cooling water pipe body 1020 , and the second end extends out of the plug 211 .

Specifically, it should be noted that the two ends of the cooling water pipe body 1020 are blocked by the plug 211. The cross section of the plug 211 can be equal to or greater than the cross section of the cooling water pipe body 1020. Seals at both ends of the body 1020. The installation position of the joint 213 can be provided by the plug 211, so that the joint 213 can be installed on the plug 211, and then the joint 213 can be connected with the water inlet and return pipes. The joint 213 can be configured as a structure convenient for connection, such as a circular shape. Through the setting of the plug 211 and the joint 213, the sealing performance of the cooling water pipe body 1020 is improved, and at the same time, it is convenient to connect with the water inlet and return water pipes, thereby solving the problem of non-circular cooling water pipe installation in the related art. It is difficult to ensure the tightness of the connection, and it is not convenient to connect with the water inlet and return pipes, which leads to troublesome installation.

Further, the cross-section of the plug 211 is set in the same circular arc diamond shape as the cross-section of the cooling water pipe body 1020, and a joint installation hole is opened on the plug 211 along its axial direction, and the joint installation hole communicates with the inside of the cooling water pipe; the joint 213 The first end of the first end is sealed and fixed in the joint installation hole.

In order to improve the sealing performance of the joint 213 and the joint installation hole, the first end of the joint 213 is screwed into the joint installation hole, and thread glue can be injected to improve the sealing performance. In order to facilitate the connection between the joint 213 and external equipment, the end of the joint 213 away from the plug 211 is also provided with an internal thread or an external thread.

An annular groove is arranged in the joint installation hole, and a sealing ring 212 is embedded in the annular groove. The joint 213 is threadedly connected with the joint installation hole and the sealing ring 212 is pressed against the annular groove, thereby improving the sealing of the joint 213 and the joint installation hole sex.

In this application, as shown in FIG. 8 , two adjacent rows of cooling water pipe bodies 1020 and three adjacent cooling water pipe bodies 1020 form a triangular arrangement of cooling water pipe units, and the arrangement size range of the cooling water pipe units is :

C=1.8A～2A;

D=0.8B～1.5B;

Among them, A is the maximum width dimension of the pipe section; B is the maximum length dimension of the pipe section; C is the center distance dimension of the pipe section of two adjacent cooling water pipe bodies 1020 in the same row; D is the distance between the adjacent cooling water pipe bodies 1020 The center-to-center dimension of the tube section.

When the cooling water pipe 102a is an arc rhombus tube, A is the maximum width of the short diagonal of the arc rhombus tube; B is the maximum length of the long diagonal line of the arc rhombus tube; C is two adjacent arc rhombus tubes in the same row The center-to-center distance of the tubes; D is the horizontal center-to-center distance between two arc-shaped diamond-shaped tubes in adjacent rows.

Fig. 13 shows a simplified diagram of the convective heat transfer of the low-temperature condensing module of the present application, in which s ₁ is the row spacing of the forked tube bundles, and s ₂ is the column spacing of the forked tube bundles.

The heat exchange on the flue gas side of the low-temperature condensation module of this application is a fluid sweeping fork tube bundle, and the relationship between the surface average heat transfer coefficient h and the dimensionless heat transfer coefficient Nu is:

Where l is the characteristic length and λ is the thermal conductivity of the fluid.

For the studied flue gas heat transfer conditions, the Reynolds number of the flow ranges from about Re=10 ³ to 2×10 ⁵ , and the value of Nu can be expressed as:

Among them, s ₁ is the row spacing of the fork tube bundle, and s ₂ is the column spacing of the fork tube bundle. Re _f is the Reynolds number of the flue gas flow, Pr _f is the Prandtl number of the flue gas, and Pr _w is the Prandtl number of the flue gas with the wall temperature as the characteristic temperature.

In engineering calculations, if the logarithmic mean temperature difference of convective heat transfer is given in the design as Δt _m , then according to the heat transfer equation, the overall heat transfer Φ is:

Φ＝kAΔt _m

Among them, k is the comprehensive heat transfer coefficient, and A is the heat transfer area.

From the above analysis, it can be seen that the heat exchange area of the arc-shaped diamond tube is larger than that of the round tube, so the application uses the arc-shaped rhombic tube as the cooling water pipe 102a to increase the overall heat transfer capacity of the equipment.

The use of circular rhombus tubes will also have an impact on the flow resistance of flue gas. The circular pipe and the preferred circular rhomboid pipe of the present application will be compared and analyzed below.

The flow resistance relational expression of the circular tube fork row is:

When the gas flows around the tube bundle, the flow resistance is a function of fluid velocity, tube bundle arrangement, fluid physical properties and row number, and its correlation is

Among them, χ is the correction coefficient of the fork tube bundle, which is the relational expression of pipeline parameters s ₁ and s ₂ , N _L is the number of pipeline rows, f is the resistance coefficient, and f is a value dependent on the change of flow Reynolds number Re.

The relational expression of the flow resistance resistance of the circular rhombic tube fork row is:

The long side of the arc-shaped diamond tube is l ₁ , the short side is l ₂ , and the design correction coefficient ε, then the flow resistance relation of the arc-shaped rhombic tube fork row is:

Among them, ε(l ₁ , l ₂ ) is a correction coefficient related to the side length of the circular rhombus tube compared with the round tube fork tube bundle, and ε(l ₁ , l ₂ ) is greater than 1. The rest of the parameters have the same meaning as the above formula.

The edge of the arc rhombus is similar to the streamline nature of the airfoil. Compared with the circular tube, the flow boundary layer separation area at the tail is reduced, and the reverse pressure gradient is reduced, so the overall resistance will decrease.

As shown in Figures 3A-3B, the box structure of the purification equipment of the present application is preferably a rectangular box structure, specifically: the box 101 includes an upper box 1011, a lower box 1012, a front box 1013 and a rear box 1014 , the upper box plate 1011, the front box plate 1013, the lower box plate 1012 and the rear box plate 1014 are sequentially sealed and connected; the left and right sides of the box body 101 are opened to form the flue gas inlet 4 and the flue gas for flue gas circulation. The gas outlet 5, and the flue gas passage from the flue gas inlet 4 to the flue gas outlet 5; the flue gas passage is used to accommodate the vertically arranged cooling water tube bundles 102 arranged in an array; the The upper box plate 1011 and the lower box plate 1012 are provided with a plurality of water pipe installation holes 102b for sealing and assembling the ends of the cooling water pipes 102a; The space for assembling the end joint assembly connecting the upper and lower ends of the cooling water tube bundle 102 . However, this application does not limit the box structure to be a rectangular structure. Those skilled in the art should understand that in some special application scenarios, the box structure can be properly deformed, such as an arc-shaped box structure with a certain radian , such as a trapezoidal box structure with different sizes of flue gas inlet and flue gas outlet.

In this application, the upper and lower ends of the cooling water tube bundle 102 are installed on the upper box plate 1011 and the lower box plate 1012 . Considering that the purification equipment needs to be operated for a long time, the cooling water pipe 102a will vibrate frequently when the low-temperature condensation module 1 is impacted by the flue gas during operation, which will easily lead to the problem of flue gas leakage at the connection between the upper and lower ends of the cooling water pipe 102a and the upper and lower box plates. In order to solve this problem, as shown in Figures 9A to 10B, the present application proposes a sealed installation structure for cooling water pipes and box plates, the sealed installation structure includes an installation base 20 and a cooling water pipe body 1020; wherein,

The installation base 20 is provided with a water pipe installation hole 102b, and the hole wall of the water pipe installation hole 102b is provided with an annular groove 17 along its circumference; .

The end of the cooling water pipe body 1020 is arranged in the water pipe installation hole 102b, the part of the cooling water pipe body 1020 corresponding to the annular groove 17 is provided with an annular protrusion 18, and the annular protrusion 18 is sealed and embedded in the annular groove 17 to facilitate cooling. The end of the water pipe body 1020 forms a curved surface seal with the water pipe installation hole 102b.

In this embodiment, the cooling water pipe body 1020 has a long strip structure, and its interior is hollow, which can be used for cooling water flow. The installation base 20 is the upper box board 1011 or the lower box board 1012 of the present application. In the prior art, in order to improve the sealing performance between the cooling water pipe body 1020 and the installation base 20, the sealing ring is generally fixed on the installation base 20, the cooling water pipe body 1020 is fixed in the sealing ring, and the cooling water pipe body is improved by the sealing ring. 1020 and the sealing of the connection of the installation base 20.

However, since the outer side of the cooling water pipe body 1020 is still a straight curved surface structure, and the corresponding position of the sealing ring and the installation base 20 is also a straight curved surface structure, so when the cooling water pipe body 1020 is installed on the sealing ring and the installation base 20 At the same time, the straight curved surface structure is still difficult to maintain the sealing performance for a long time, so the sealing effect is still not ideal.

Therefore, in order to solve this problem, as shown in Figures 9B and 10B, in this embodiment, a water pipe installation hole 102b is provided on the installation base 20, and an annular groove 17 is provided in the water pipe installation hole 102b. The end of the cooling water pipe body 1020 is sleeved in the water pipe installation hole 102b. In order to make the cooling water pipe body 1020 fit with the annular groove 17, an annular protrusion 18 can be set on the outside of the cooling water pipe body 1020, and the annular protrusion The protrusion 18 is sealingly embedded in the annular groove 17, so that a curved surface seal is formed between the annular protrusion 18 and the annular groove 17.

Due to the setting of the annular groove 17, the inner surface of the water pipe installation hole 102b on the installation base 20 changes from a straight curved surface structure to a zigzag curved surface structure, while the outer surface of the end of the cooling water pipe body 1020 changes from a straight curved surface The structure transforms into a sinuous surface structure. It can be understood that when the cooling water pipe body 1020 is installed in the water pipe installation hole 102b, the connection between the cooling water pipe body 1020 and the water pipe installation hole 102b is also changed from a straight curved surface structure to a zigzag curved surface structure, thereby improving the cooling water pipe. The tightness of the connection between the body 1020 and the water pipe installation hole 102b. An interference fit can be adopted between the annular protrusion 18 and the annular groove 17 to further improve the sealing performance.

This embodiment achieves the technical effect of improving the sealing between the cooling water pipe body 1020 and the installation base 20 and preventing the exhaust gas from leaking from the connection between the two, and further solves the problem that the cooling water pipe and the installation base 20 in the related art generally only use Sealant 16 or sealing ring are sealed, and the sealing performance is still difficult to meet the problem of use requirements.

As shown in Figures 9B and 10B, the annular groove 17 in the water pipe installation hole 102b can be grooved by special tooling, and the width of the section of the annular groove 17 can gradually decrease from the inside to the outside, thereby forming a A small rounded end structure with a smaller diameter. Compared with the structure of the annular groove 17 , when the annular protrusion 18 cooperates with the structure of the rectangular groove or grooves of other shapes, the sealing performance will be better. The annular protrusion 18 on the cooling water pipe body 1020 can be realized by expanding the pipe. Specifically, the cooling water pipe body 1020 can be set in the water pipe installation hole that has been opened with the annular groove 17, and the special pipe expansion tool can be used. Apply outward expansion pressure to the portion of the cooling water pipe body 1020 corresponding to the annular groove 17 , so that the corresponding portion of the cooling water pipe body 1020 is deformed to form the first annular protrusion 18 and be squeezed and fixed in the annular groove 17 .

In order to further improve the sealing of the joint between the cooling water pipe body 1020 and the installation base 20, a sealant 16 is provided in the annular groove 17, and the sealant 16 can be applied in the annular groove 17 before the cooling water pipe body 1020 is installed. After the water pipe body 1020 expands to form an annular protrusion 18 embedded in the annular groove 17 , the sealing performance is improved under the action of the sealant 16 .

In order to improve the uniformity of the depth of the annular groove 17, the annular groove 17 is coaxially arranged with the water pipe installation hole.

As shown in FIGS. 9B and 10B , a rubber gasket 15 is also provided in the annular groove 17 , and the annular protrusion 18 presses the rubber gasket 15 against the annular groove 17 . The formation of the rubber gasket 15 matches the shape of the annular groove 17. The rubber gasket 15 can be embedded in the annular groove 17 first, then the sealant 16 is injected into the annular groove 17, and finally the cooling water pipe body 1020 Set in the water pipe installation hole 102b.

The annular groove 17 includes a plurality of grooves arranged at intervals along the circumference of the wall of the water pipe installation hole 102b, and the extension depths of the plurality of grooves on the hole wall are the same or different. The contact points between the cooling water pipe body 1020 and the inner wall of the water pipe installation hole 102b can be increased through multiple grooves. When the extension depths of multiple grooves are inconsistent, the sealing properties between different contact points can be different, and the groove depth can be adjusted according to the actual exhaust gas flow conditions to improve the application range.

In order to further improve the sealing of the connection between the cooling water pipe body 1020 and the installation base 20, multiple annular grooves 17 are arranged and distributed along the axial direction of the water pipe installation hole 102b, thereby forming a multi-stage seal, and the sealing method of each stage is different. same.

In order to further improve the sealing performance, as shown in FIG. 10B, there are two annular grooves 17 in this embodiment, including a first annular groove 171 and a second annular groove 172. The groove of the first annular groove 171 The opening direction and the groove opening direction of the second annular groove 172 are inclined in the opposite direction in the axial direction of the water pipe installation hole; correspondingly, the annular protrusion 18 includes a first annular protrusion 18 and a second annular protrusion 18, the second annular protrusion 18 The protrusions of the first annular protrusion 18 and the second annular protrusion 18 are inclined in opposite directions in the axial direction of the water pipe installation hole.

Specifically, it should be noted that the first annular groove 171 and the second annular groove 172 are arranged sequentially from the inside to the outside, the groove opening direction of the first annular groove 171 can be inclined toward the inside of the installation base 20, and the second The groove opening direction of the two annular grooves 172 can be inclined toward the outside of the installation base 20 , so that the connection between the cooling water pipe body 1020 and the water pipe installation hole 102 b can be sealed in different directions.

Moreover, in this embodiment, the depth of the second annular groove 172 is greater than the depth of the first annular groove 171 . Through this arrangement, the second annular groove 172 forms a secondary seal with better airtightness, further improving the airtightness of the overall joint.

After the annular groove 17 cooperates with the annular groove 17 located in the water pipe installation hole 102b, the partial sealing performance in the water pipe installation hole 102b is effectively improved, but the parts at both ends of the water pipe installation hole 102b are still straight curved surface structures , its tightness still needs to be improved. Therefore, as shown in FIG. 10B , in this embodiment, two ring-shaped engaging protrusions 19 are provided on the cooling water pipe body 1020 . At both ends of the hole 102b, the opposite surfaces of the two ring-shaped locking protrusions 19 are respectively pressed against the inner surface and the outer surface of the installation base 20 . The first seal and the last seal at the connection between the cooling water pipe body 1020 and the installation base 20 are respectively formed by two ring-shaped snap-in protrusions 19, which can further strengthen the sealing performance, and at the same time improve the sealing performance between the cooling water pipe body 1020 and the installation base 20. connection strength.

As a preferred embodiment of the present application, the water pipe installation hole 102b is an arc rhombus hole consistent with the end cross-sectional profile and size of the arc rhombus pipe, and the annular groove 17 includes a plurality of grooves, which are sequentially arranged at the ends of the arc rhombus hole. On the four straight sides 1020c and the two large arc ends 1020b, correspondingly, the annular protrusion 18 includes a plurality of protrusions arranged on the four straight sides 1020c and the two large arc ends 1020b at the end of the arc diamond tube In addition, multiple grooves fit together with multiple protrusions, combined with different fitting depths of grooves and protrusions, combined with the special shape of the upper arc rhombus, so that the cooling water pipe 102a and the installation base 20 (The upper box plate 1011 and the lower box plate 1012) The sealing performance of the connection can meet the requirements of the long-term operation of the purification equipment without smoke leakage.

In this application, the structural form of the end joint assembly will affect the flow form of the cooling water from the cooling water inlet 103a to the cooling water return port 104a. The present application proposes five embodiments of cryogenic condensation modules 1 with different end fitting assemblies.

2C-2E illustrate an embodiment of a cryogenic condensation module with round pipe elbows as end fittings. It can be seen from the figure that the end joint assembly is a round pipe elbow assembly that sequentially communicates the ends of two adjacent cooling water pipes 102a. Along the direction from the flue gas inlet 4 to the flue gas outlet 5, the ends of two adjacent rows of cooling water pipes 102 are connected by a round pipe elbow 105 located outside the box plate.

In this embodiment, the cooling water circulation pipeline is arranged above the box body 101 of the low-temperature condensation module 1, and may also be arranged below in other embodiments, and the specific location is set according to actual needs. The cooling water circulation pipeline is set in two groups. The cooling water tube bundle 102 is divided into two cooling water pipe areas 24 in the front and back along the direction from the flue gas inlet 4 to the outlet in the box body 101. The cooling water inlet pipeline 103 of the two groups of cooling water circulation pipelines and the cooling water return pipeline 104 communicate with the water inlet cooling water pipeline and the water outlet cooling water pipeline of the front and rear two cooling water pipe areas 24 respectively. Due to the high temperature of the flue gas near the flue gas inlet 4, the cooling temperature of the cooling water pipe 102a near the flue gas inlet 4 needs to be greatly reduced, and the temperature of the flue gas near the flue gas outlet 5 is higher than that of the cooling water pipe on the front side. 102a on the basis of cooling, the cooling temperature drop requirement of the cooling water pipe 102a near the flue gas outlet 5 is small, so in this embodiment, the cooling water flow rate in the cooling water pipe area 24 near the outlet side can be reduced, so that Can save cooling water consumption. Specifically, the way to reduce the cooling water flow near the cooling water pipe area 24 on the outlet side may be to reduce the pipe diameter (ie cross-sectional area size) of the cooling water pipe 102a or reduce the water inlet flow of the cooling water inlet pipe 103 . In other embodiments, the cooling water flow rate of the cooling water pipe area 24 on the outlet side may not be reduced, that is, the cooling water consumption of the cooling water pipe area 24 on the inlet side is consistent with the flow rate of the cooling water pipe area 24 on the outlet side. In addition, it should be noted that the present application does not limit the number of cooling water pipe areas 24 , and in other embodiments, it can be set to three, four, five, etc. according to actual needs.

In the above embodiment, due to the large number of cooling water pipes 102, the same number of round pipe elbows 105 needs to be used, and a large number of round pipe elbows 105 will cause the loss of kinetic energy resistance of the cooling water at the turning point, reducing the The heat exchange efficiency of the cryogenic condensation module 1. At the same time, in order to reduce the overall volume of the low-temperature condensation module 1, the distance between the cooling water pipes 102 is small, and the round pipe elbow 105 is to realize the end connection of the two cooling water pipes 102, and the arc of the round pipe elbow 105 is relatively small. It is more difficult.

In order to solve the problem of large loss of cooling water kinetic energy resistance at the round pipe elbow 105 and the difficulty of processing the round pipe elbow 105, Figures 3A-6D show the implementation of using a water tank instead of the round pipe elbow 105 as an end joint assembly example.

Specifically, the end joint assembly includes an upper end joint assembly 25 and a lower end joint assembly 26, and the upper end joint assembly 25 and the lower end joint assembly 25 are above and below the cooling water tube bundle 102 along the The flue gas flow directions are arranged alternately in sequence, and each end joint passes through the ends of multiple rows of cooling water pipes 102a to form parallel pipes in the cooling water tube bundle 102 for at least two rows of parallel water flows to flow in the same direction. Specifically, the upper end assembly 25 is the upper water tank 11, the lower end assembly 26 is the lower water tank 12, and the upper water tank 11 includes multiple pipes arranged above the cooling water tube bundle 102 along the flue gas circulation direction. An upper water tank subsection 111 as the end joint, and the lower water tank 12 includes a plurality of lower water tank subsections as the end joint arranged in a row below the cooling water tube bundle 102 along the flue gas flow direction Part 121, the multiple rows of cooling water pipes 102a through which each water tank subdivides include water inlet pipes and water outlet pipes arranged side by side along the flue gas flow direction, the number of rows of the water inlet pipes and the water outlet pipes same.

Figures 3A-3D illustrate an embodiment in which cooling water circulates along grouped water pipes. In this embodiment, a water tank is provided on the outside of the upper and lower box panels of the box body 101 to replace the round pipe elbow 105 in the first embodiment to realize the communication at the end of the cooling water pipe 102 . An upper water tank 11 is arranged above the upper tank plate 1011, and a lower water tank 12 is arranged below the lower tank plate 1012. Several partitions are arranged in the upper water tank 11 to divide the upper water tank 11 into the first to N upper water tank subsections 111. A plurality of partitions are arranged in the lower water tank 12 to divide the lower water tank 12 into the 1st to Nth lower water tank subsections 121, and each upper water tank subsection 111 or lower water tank subsection 121 communicates with the ends of at least two rows of cooling water pipes 102 correspondingly. department. The cooling water inlet pipeline 103 communicates with the first lower water tank subdivision 121 near the flue gas inlet 4, while the cooling water return pipeline 104 communicates with the Nth upper water tank subdivision 111 farthest from the flue gas air inlet 4. The 2nd to N lower water tank subsections 121 of the water tank 121 are respectively arranged alternately with the 1st to N−1 upper water tank subsections 111 of the upper water tank 111 . Specifically, as shown in FIG. 3A , the cooling water enters the first lower water tank subsection 121 of the lower water tank from the cooling water inlet, and the first lower water tank subsection 121 corresponds to four rows of cooling water pipes 102a. Driven by pressure, the cooling water flows upward along the 4 rows of cooling water pipes 102a and flows out from the first 4 rows of cooling water pipes 102a of the first upper water tank subsection 111. As can be seen from the figure, the first upper water tank subsection 111 corresponds to 8 rows of cooling water pipes 102a. The cooling water flowing in from the first 4 rows passes through the first upper water tank subdivision 111 and then flows downward to the rear 4 rows of cooling water pipes 102a. The second lower water tank subdivision 121 corresponds to 8 Row of cooling water pipes 102a, the cooling water of the 4 rows of cooling water pipes 102a flowing down through the first upper water tank subsection 111 flows upwards from the rear 4 rows of cooling water pipes 102a after being diverted by the second lower water tank subsection 111, the second to N- 1. The upper water tank subsection 111 and the third to N lower water tank subsections 121 are sequentially arranged according to the above-mentioned rules. The cooling water return port on the Nth upper water tank subsection 11 of the water tank 11 flows out.

In this embodiment, the round pipe elbow in the above-mentioned embodiment is replaced by water tank divisions, so that the cooling water route turns from the one-way steering in the above-mentioned embodiment to multi-way steering, which reduces the number of turns and turns of the cooling water. The resistance loss of the water tank improves the heat exchange efficiency of the cooling water tube bundle; secondly, the water tank also reduces the processing difficulty and cost compared with the round pipe elbow.

As for the water flow resistance, because it flows in the pipe, its flow resistance is composed of the along-path resistance of the straight pipe section and the local resistance of flowing through elbows, joints and sudden changes.

The resistance along the way is expressed as:

Where λ is the resistance coefficient along the way, l is the length of the pipe, d is the inner diameter of the pipe, V _i is the flow velocity in the pipe, and g is the acceleration of gravity;

The local resistance is expressed as:

where ξ is the local resistance coefficient, and N is the number of local resistance components.

From the above two formulas, the longer the tube length l, the larger h _f is, the larger N is, and the larger _hξ is. When changing from an elbow form to an integral water tank, the distance of water flow from one side to the other is greatly reduced, and the flow resistance is only composed of a small section of resistance along the way and two local resistances. Because the tube bundle array is changed from series arrangement to parallel arrangement, at this time, the flow resistance of each channel is the same and greatly reduced.

It should be noted that in the present application, the water tank subsections can also be set independently, that is, the water tank subsections are independently formed, and the water tank subsections can be fixed by a fixing structure. In addition, the shape of the water tank subsection is not limited to the rectangular shape in the embodiment of the present application. In other embodiments, in order to further reduce the resistance loss of cooling water turning, the outer right angles of the rectangular water tank subsection can also be processed into rounded corners. .

Considering that the flue gas temperature near the flue gas inlet 4 is high and the amount of cooling water is large, and the flue gas temperature far away from the flue gas inlet 4 is low and the amount of cooling water is small, in order to further reduce the amount of cooling water, as the application of low temperature condensation The best embodiment of module 1, Figure 4A-4C shows the embodiment in which the cooling water in each zone of the straight-through circulation circulates along the grouped water pipes and the amount of cooling water is adjustable. 102 is divided into the 1st to Nth zones, and the cooling water pipes 102 in each zone are correspondingly provided with a set of cooling water inlets 103a and cooling water return ports 104a, and several cooling water pipe zones are isolated from each other, and the cooling water circulation is carried out independently. In this application, the purpose of saving the overall water consumption of the low-temperature condensation module 1 is achieved by reducing the water intake in the cooling water pipe area on the side away from the flue gas air inlet 4 . Specifically, in this embodiment, the cooling water pipe 102 is divided into three zones, and the cooling water consumption of the first zone to the third zone is set to decrease sequentially. The present application does not limit the number of subdivisions of the cooling water pipe 102. In other embodiments, the cooling water pipe 102 can be divided into two zones, four zones, five zones, etc. according to actual needs. Correspondingly, the cooling water inlet 103a and the cooling water return port 104a are also arranged in two groups, four groups, five groups, etc.

Further, in the embodiment of the present application, the way to sequentially reduce the amount of cooling water on the side away from the flue gas inlet 4 is: by setting at the cooling water inlet 103a of the first lower water tank subsection 121 of each cooling water pipe area Flow regulating valve 1031, by adjusting the inlet area of flow valve 1031, the adjustment of cooling water consumption in each cooling water pipe area can be realized. Specifically, a water distribution pipe 1033 communicating with the lower water tank subsection 121 is provided on the first lower water tank subsection 121 of each cooling water pipe area, and a flow regulating valve 1031 is provided on the water distribution pipe 1033 .

Still further, a cooling water inlet main pipe 1032 is arranged below the lower water tank 12 of each cooling water pipe area, and communicates with each water distribution pipe 1033 respectively, and cooling water enters from the cooling water inlet main pipe 1032, and the cooling water inlet main 1032 divides the cooling water into each water distribution pipe 1033 according to the opening size of each flow regulating valve 1031. The openings are successively reduced, so that the amount of cooling water diverted from the main cooling water inlet pipe to the water distribution pipe 1033 far away from the flue gas inlet 4 is successively reduced, and the overall consumption of cooling water is reduced on the basis of meeting the condensation efficiency of the low temperature condensation module 1 .

As an alternative embodiment of the low-temperature condensation module 1 of the present application, the upper end component is an upper water tank that runs through the upper ends of all cooling water pipes, and the lower end component is a lower water tank, and the lower water tank includes A plurality of sub-sections of the lower water tank arranged in a row, each of the sub-sections of the lower water tank is connected with multiple rows of the cooling water pipes; the upper water tank is connected to a cooling water return port, and each sub-section of the lower water tank is connected to a cooling water inlet Shuikou. It also includes a cooling water inlet main pipe, and the cooling water inlet main pipe communicates with each of the cooling water inlets through a flow regulating valve. Specifically, as shown in Fig. 5A-5C, in the straight-through type adjustable cooling water embodiment in each zone, several partitions are arranged in the lower water tank 12 to divide the lower water tank 12 into several lower water tank subsections 121, and each group of lower water tank subdivisions 121 is connected correspondingly. The number of cooling water pipes 102a can be the same or different, and it can be set according to actual needs. No clapboard is provided in the upper water tank 11, and the upper water tank is a return water tank covering and communicating with the first to Nth rows of cooling water pipes 102.

The cooling water enters from the cooling water inlet main pipe 1032, and is shunted to the corresponding lower water tank subsection 121 by the flow regulating valve 1031 of each water distribution pipe 1033. In this embodiment, each lower water tank subsection 121 is a water inlet tank. Water flows from bottom to top along the cooling water pipes 102a into the upper water tank 11 from each branch, and finally flows out from the cooling water return port 104a provided at the Nth row of cooling water pipes 102a.

Further, considering that the flue gas temperature near the flue gas inlet 4 is high and the amount of cooling water is large, and the flue gas temperature far away from the flue gas inlet 4 is low and the amount of cooling water is small, in order to further reduce the low temperature and low temperature of the embodiment of the present application For the cooling water consumption of the condensing module 1, set the cooling water volume of the subsection away from the flue gas inlet 4 to be smaller than the cooling water volume of the subsection near the flue gas inlet 4, specifically, along the flue gas inlet 4 to In the direction of the outlet, the openings of the flow regulating valves 1031 of the water distribution pipes 1033 of each subsection decrease sequentially.

As an alternative embodiment of the low-temperature condensation module 1 of the present application, the upper end assembly 25 is the upper water tank 11 passing through the upper ends of all the cooling water pipes 102a, and the lower end assembly 26 is the lower water tank passing through the lower ends of all the cooling water pipes 102a. 12. One of the upper water tank 11 and the lower water tank 12 is connected to the cooling water inlet 103a, and the other is connected to the cooling water return port 104a. Specifically, as shown in Figures 6A-6D, the straight-through cooling water in each zone circulates along the grouping water pipes and the cooling water volume is adjustable. There is no partition in the upper water tank 11, and the upper water tank 11 is a return water tank connected to the cooling water return port 104a; There is no partition set in the water tank 12, and the lower water tank 12 is a water inlet tank connected to the cooling water inlet 103a. Both the upper water tank 11 and the lower water tank 12 cover and communicate with the first to N rows of cooling water pipes 102a. Cooling water enters the lower water tank 12 from the cooling water inlet 103a, then flows from bottom to top to the upper water tank 11 from each row of cooling water, and finally flows out from the cooling water return port 104a provided at the cooling water pipe 102a of the Nth row.

Further, considering that the flue gas temperature near the flue gas inlet 4 is high and the cooling water consumption is large, and the flue gas temperature far away from the flue gas inlet 4 is low and the cooling water consumption is small, in order to further reduce the temperature of the low-temperature low-temperature condensation module 1 The amount of cooling water, in the embodiment of this application, along the direction from the flue gas inlet 4 to the outlet, the size of the opening connecting the lower water tank 12 with each row of cooling water pipes 102a is sequentially reduced, so that the direction from the flue gas inlet 4 to the outlet The cooling water volume of each row of cooling water pipes 102a decreases sequentially, so as to realize the overall water consumption of the low-temperature low-temperature condensation module 1 .

In addition, as shown in Figures 3C, 4C, 5C, and 6C, the cooling water inlet 103a and the cooling water return port 104a are arranged on opposite sides, so that the running distance and resistance of the cooling water in the water distribution pipes 1033 flowing in parallel are the same, so that It is ensured that the flow rate of water in each parallel water distribution pipe 1033 is the same and the cooling efficiency of the corresponding flue gas is the same.

In addition, in order to ensure the overall appearance of the purification equipment, this application installs a closed grille cover on the outside of the lower box plate 1012 to cover the exposed water tank or elbow 105 at the bottom of the box body 101 .

The embodiment of the present application also provides a low-temperature condensation module 1 with a defogging and water-collecting baffle structure.

The wind speed of the flue gas discharged from the cement kiln is high, and the time for heat exchange and condensation through the low-temperature condensation module 1 is relatively short. Condensed water containing ammonia will be discharged from the flue gas outlet 5 to cause pollution. Therefore, in this embodiment, the demisting and water-collecting baffle 13 is provided at the air outlet of the flue gas to further collect the moisture in the flue gas cooled to the dew point.

In order to further ensure that ammonia-containing condensed water will not be discharged from the flue gas outlet 5 to the outside world, in the embodiment of the present application, as shown in Figure 3A, a number of vertically arranged defogging and water-collecting water barriers are arranged at the flue gas outlet 5 Plate 13, the surface of the defogging and water-collecting water-retaining plate 13 is a folded plate with multiple corners. After the smoke is discharged from the last row of cooling water pipes 102a, it will pass through the defogging and water-collecting water-retaining plate 13. Under the action of the surface, the velocity of the flue gas will decrease, and the condensed water in the flue gas will be bonded to the surface of the defogging and water-collecting water retaining plate 13 and stay to the bottom of the device along the surface of the defogging and water-collecting water retaining plate 13. The setting of the mist-removing water-collecting baffle 13 can prevent the condensed water in the flue gas from being discharged to the outside from the flue gas port.

Further, the folded panel includes at least a pair of folded corners bent in opposite directions. In this way, the stroke of the flue gas traveling on the folded plate can be increased, which is beneficial to the collection of moisture contained in the flue gas.

As a preferred embodiment, the section of the folded panel close to the air outlet of the flue gas is a straight section, which serves to guide the flue gas to flow along the defogging and water-collecting baffle 13 . Further, at least part of the defogging and water-collecting water retaining plate 13 is formed with vertically extending oblong holes as drainage holes along the surface of the defogging and water-collecting water retaining plate 13, which are bonded to the surface of the defogging and water-collecting water retaining plate 13 The condensed water will flow along the oblong hole to the bottom of the device for discharge. Preferably, the oblong hole extends from the upper end to the bottom end of the flap.

In order to further improve the safety of flue gas emission, a steel wire mesh 14 is arranged outside the defogging water collecting water retaining plate 13 to make the last stop for the condensed water in the flue gas.

In summary, the self-sustaining one-step purification equipment provided by this application is applied to flue gas purification treatment scenarios such as cement kilns, power plants or coal yards, which can effectively reduce the content of fugitive ammonia, SO ₂ , NOx, CO ₂ and amount of dust.

In an embodiment of the purification equipment of the present application, when the flue gas temperature at the flue gas inlet is 105°C, the moisture content of the flue gas is 9.5%, the escape ammonia is 20 mg/m ³ , the SO ₂ content is 15 mg/m ³ , and the NOx content is 38 mg/m 3 . m ³ , CO ₂ concentration 20.5%, dust content 6mg/m ³ , cooling water inlet water temperature 28℃,

(1) The air temperature at the flue gas outlet is 60 degrees Celsius, the moisture content of the flue gas is 6.5%, the escape ammonia is 6mg/m ³ , the SO ₂ content is 5 mg/m ³ , the NOx content is 34 mg/m ³ , the CO ₂ concentration is 18.5%, and the The dust content is 3mg/m ³ , and the cooling water outlet temperature is 46°C.

(2) When increasing the amount of cooling water in the low-temperature condensation module so that the air temperature of the flue gas outlet of the purification equipment is 50 degrees Celsius, the moisture content of the flue gas is 5.0%, the escape ammonia is 3 mg/m ³ , the SO ₂ content is 2 mg/m ³ , and the NOx The content is 32mg/m ³ , the CO ₂ concentration is 17.5%, the dust content is 2mg/m ³ , and the cooling water outlet temperature is 41°C.

In another embodiment of the purification equipment of the present application, when the flue gas temperature at the flue gas inlet is 150°C, the moisture content of the flue gas is 7.5%, the escape ammonia is 80 mg/m ³ , the SO ₂ content is 150 mg/m ³ , and the NOx content is 40 mg /m ³ , CO ₂ concentration 21.0%, dust content 5mg/m ³ , cooling water inlet water temperature 28°C,

The air temperature at the flue gas outlet is 65 degrees Celsius, the moisture content of the flue gas is 6.0%, the escape ammonia is 15 mg/m ³ , the SO ₂ content is 42 mg/m ³ , the NOx content is 36 mg/m ³ , the CO ₂ concentration is 19.0%, and the dust content is 3 mg/m 3 . m ³ , and the water temperature at the cooling water outlet is 65°C.

For the situation where the air temperature at the flue gas inlet is high or the moisture content of the flue gas is low or the content of escaped ammonia at the flue gas inlet is high, in order to further improve the purification efficiency of escaped ammonia, as shown in Figure 1B and Figure 2A, the embodiment of the present application Provide a self-sustaining one-step purification equipment with an atomization device, the atomization device 3 is used to spray water towards the 4 places of the flue gas air inlet, and the atomization device 3 is set at the 4 places of the flue gas air inlet, more specifically , the atomizing device 4 is set at the trapezoidal joint where the flue gas outlet of the cement kiln is connected to the flue gas inlet 4 of the purification equipment, but it should be noted that the setting position of the atomizing device 3 is not limited to the flue gas inlet 4, for example, in some other embodiments, the atomizing device 3 can also be arranged at the flue gas discharge port of the cement kiln or at a position further in front. The water content in the flue gas can be increased by spraying water at the air inlet of the flue gas. The specific principle is: due to the high temperature of the flue gas, after the atomized water enters the flue gas, it will be evaporated into water vapor by the high temperature of the flue gas, thereby increasing the water vapor content in the flue gas. When the water vapor content in the flue gas is low, through The atomized water of the atomizing device 3 can increase the content of water vapor in the flue gas, thereby improving the efficiency of ammonia removal. In addition, chemicals (medicines that are helpful for deammonization, denitrification, and desulfurization) can also be added to the sprayed water. Adding chemicals through atomized water can make the chemicals fully contact with the flue gas and further improve the cleanliness of the exhausted flue gas. . Finally, the atomized water can also cool the flue gas and reduce the working pressure of the subsequent low-temperature condensation module 1 .

The atomization device includes an atomized water tank, a spray system and a spray water pipe connected in sequence, the atomized water tank is connected to a water source, and the spray water pipe is arranged at the air inlet of the flue gas for Spray water.

Further, the atomization device further includes an atomized water flow control mechanism, which is used to control the amount of atomized water sprayed by the spray water pipe to the flue gas air inlet.

When the temperature of the flue gas at the flue gas inlet is greater than 120°C or the moisture content of the flue gas at the flue gas inlet is less than 8% or the escaping ammonia at the flue gas inlet is 100mg/ ^m3 , start the atomization device .

When the SO ₂ content at the air inlet of the flue gas is greater than 100 mg/m ³ , start the atomization device, and add desulfurization agents to the atomized water; and/or, when the NOx content at the air inlet of the flue gas is greater than When the concentration is 50 mg/m ³ , start the atomization device, and add denitrification agent into the atomized water.

In one embodiment of the purification equipment of this application, when the flue gas temperature at the flue gas inlet is 150°C, the moisture content of the flue gas is 7.5%, the escape ammonia is 80 mg/m ³ , the SO ₂ content is 150 mg/m ³ , and the NOx content is 40 mg/m 3 . m ³ , CO ₂ concentration 21.0%, dust content 5mg/m ³ , cooling water inlet water temperature 28℃,

Enable the atomization device 3, adjust the moisture content of the inlet flue gas to 9.0%, reduce the inlet air temperature to 128°C, and increase the amount of cooling water so that when the air temperature of the flue gas outlet of the purification equipment is 55°C, the moisture content of the flue gas is 5.0%, Ammonia escape 4mg/m ³ , SO ₂ 18mg/m ³ , NOx content 34mg/m ³ , CO ₂ concentration 17.8%, dust content 1.5mg/m ³ , and the water temperature at the cooling water outlet is 48°C.

As a preferred embodiment of the present application, the purification equipment further includes a spray cleaning device 2 . Because the flue gas contains particulate matter, the cooling water pipe 102 of the low-temperature condensation module 1 is in contact with the flue gas for a long time, so that the particulate matter will stick to the surface of the cooling water pipe fitting and be difficult to remove, reducing the heat transfer efficiency of the low-temperature condensation module 1 (that is, for the flue gas cooling efficiency), for this reason, as shown in Figure 1B, spray water to the junction of cement kiln flue gas outlet 5 and deamination device by spraying device 2, and spray water is sprayed to the flue gas outlet place in columnar shape, The fast-flowing flue gas blown out from the flue gas outlet 5 of the cement kiln rushes onto the surface of the cooling water pipe fitting, and washes away the particles bonded on the pipe fitting surface.

The embodiment of the present application also provides a purification process using the above-mentioned self-supporting one-step purification equipment, which is used to purify the flue gas of the flue gas discharge equipment to be purified. The purification process mainly includes the following steps:

Install the self-sustaining one-step high-efficiency purification equipment to the flue gas outlet of the flue gas discharge equipment to be purified, so that the flue gas inlet of the self-sustaining one-step high-efficiency purification equipment and the flue gas discharge of the equipment to be purified The flue gas outlet of the equipment is sealed and connected;

Start the self-sustaining one-step high-efficiency purification equipment to work. By cooling the flue gas, the water vapor in the flue gas is condensed into condensed water, and the ammonia gas and acidic pollutants contained in the flue gas are dissolved in the An acid-base neutralization reaction occurs in the condensed water to generate a non-volatile salt that is easily soluble in the condensed water.

In order to improve the deamination rate, further, the purification process also includes: by setting an atomization device at the air inlet of the flue gas, spraying water to the air inlet of the flue gas to increase the water vapor content in the flue gas, experiments have proved that, The deamination rate can be greatly improved by increasing the water vapor content in the flue gas.

Because the flue gas contains particulate matter, the cooling water pipe 102 of the low-temperature condensation module 1 is in contact with the flue gas for a long time, so that the particulate matter will stick to the surface of the cooling water pipe fitting and be difficult to remove, reducing the heat transfer efficiency of the low-temperature condensation module 1 (that is, for the flue gas cooling efficiency), for this reason, the purification process also includes: spraying water to the joint of the cement kiln flue gas outlet 5 and the flue gas inlet of the self-sustaining one-step purification equipment through the spraying device 2, and the spray water is in the form of The column is sprayed to the flue gas outlet, and the fast-flowing flue gas blown out from the cement kiln flue gas outlet 5 rushes to the surface of the cooling water pipe fitting, washing away the particles bonded on the pipe fitting surface.

In addition, the purification process also includes: treating the salt-containing condensed water collected at the bottom of the self-sustaining one-step high-efficiency purification equipment through membrane separation into purified water that can be reused or discharged outside, and high-concentration salt-containing water. The salt high-concentration water is sprayed into the grate cooler of the flue gas discharge equipment to be purified. The advantages of this step have been described above and will not be repeated here.

The embodiment of the present application also provides a modularized purification equipment. The purification equipment in the above-mentioned embodiments is modularized. The modularized purification equipment includes several purification equipment sub-modules, and several purification equipment sub-modules can be connected in parallel and/or in series along the set up. Standardize the sub-modules, and adjust the number of stator modules and the connection mode between sub-modules according to the requirements and site layout.

Specifically, in one embodiment of the present application, one purification equipment can be made into two purification equipment sub-modules, and the two purification equipment sub-modules are placed side by side during on-site installation. Further, in order to ensure the reliability of the connection between the two sub-modules, the two purification equipment sub-modules can be connected by bolts or welding.

In addition, the sub-modules can also be placed at intervals, and the cement kiln flue gas outlet 5 is diverted to each sub-pipe to enter each sub-module respectively, and finally the flue gas of all sub-modules is collectively discharged.

Since the sub-modules are standardized designs, when the actual application scenario exceeds the purification capacity of the sub-modules, several sub-modules can be used in series along the flue gas flow direction.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, there may be various modifications and changes in the present application. Within the spirit and principles of this application, any modifications, equivalent replacements, improvements, etc., shall be included within the protection scope of this application.

Claims (45)

1. A self-sustaining one-step method purifying equipment is characterized in that the equipment is used for purifying flue gas containing water vapor, ammonia gas and acidic pollutants; the purification device comprises

The device comprises a flue gas air inlet, a flue gas air outlet and a flue gas purification channel from the flue gas air inlet to the flue gas air outlet;

the low-temperature condensation module is arranged in the flue gas purification channel and used for cooling and condensing the flue gas in the flue gas purification channel from the flue gas air inlet, condensing the water vapor into condensed water, dissolving the ammonia gas in the condensed water and generating acid-base neutralization reaction in the condensed water to generate salt which is soluble in non-volatile substances of the condensed water.

2. The self-sustaining one-step process clarification plant of claim 1, wherein the low temperature condensing module is connected to a cooling water inlet and a cooling water return; the low-temperature condensation module comprises a cooling water pipe bundle which is vertically arranged in the flue gas purification channel and is arranged in an array manner and end joint components which are communicated with the upper end part and the lower end part of the cooling water pipe bundle, and the end joint components and the cooling water pipe bundle form a cooling water circulation pipeline for cooling water to flow from the cooling water inlet to the cooling water return port.

3. The self-contained, one-step process purification apparatus of claim 2, wherein said bundles of chilled water are arranged in a bifurcated bundle array.

4. The self-sustaining one-step-method clarification plant according to claim 3, wherein the cooling water tube bundle is divided into a plurality of cooling water tube zones along a flue gas flowing direction, each cooling water tube zone comprises a plurality of rows of cooling water tubes arranged along the flue gas flowing direction, two adjacent rows of the plurality of rows of cooling water tubes are staggered in the flue gas flowing direction, and no gap exists between the orthographic projection surfaces.

5. The self-sustaining one-step method clarification plant of claim 4, wherein three adjacent cooling water pipes in two adjacent rows of cooling water pipes form a cooling water pipe unit with triangular arrangement, and the arrangement size range of the cooling water pipe unit is:

C＝1.8A～2A；

D＝0.8B～1.5B；

wherein A is the maximum width dimension of the tube cross section; b is the maximum length size of the pipe section; c is the size of the center distance of the pipe sections of two adjacent cooling water pipes in the same row; d is the center distance size of the tube sections of the adjacent rows of cooling water tubes.

6. The self-sustaining one-step process clarification plant of claim 2, wherein the condenser tube is a circular arc diamond condenser tube, the circular arc diamond condenser tube comprising: the cooling water pipe body is characterized by comprising a cooling water pipe body, wherein the cross section of the cooling water pipe body is in an arc rhombus shape, two ends of a short diagonal line of the cooling water pipe body are respectively large arc ends, and two ends of a long diagonal line of the cooling water pipe body are respectively small arc ends; the large arc ends at the two ends of the short diagonal line are connected with the small arc ends at the two ends of the long diagonal line through straight edges respectively, and the straight edges are tangent to the circular arc lines of the large arc ends and the small arc ends.

7. The self-sustaining one-step process purification apparatus of claim 6, wherein the large circular arc ends at both ends of the short diagonal are concentrically arranged.

8. The self-sustaining one-step process purification apparatus of claim 6, wherein the line of midpoints of the large arc ends at both ends of the short diagonal is perpendicular to the line of the small arc ends at both ends of the long diagonal.

9. The self-contained one-step process purification apparatus of claim 6, wherein the large and small arc ends each comprise an internal fillet and an external fillet.

10. The self-sustaining one-step process clarification plant according to claim 7, wherein the cross-section of the cooling water pipe body has the following dimensions:

A＝20～100mm；

B＝A～2A；

R ₁ ＝1/2×A；

R ₂ ＝R ₁ -t；

r ₁ ＝6～1/2×R ₁ ；

r ₂ ＝r ₁ -t；

wherein, a is the short diagonal length of the cooling water pipe body 1020; b is the length of the long diagonal of the cooling water tube body 1020; r ₁ The outer diameter of the large arc end is the size; r ₂ The inner diameter of the large arc end is the size; t is the wall thickness of the cooling water pipe body 1020; r is a radical of hydrogen ₁ The outer diameter of the small arc end is the size; r is ₂ Is the inner diameter size of the small arc end.

11. The self-sustaining one-step method clarification plant of claim 6, wherein the arc-shaped rhombus cooling water pipe further comprises an upper joint and a lower joint respectively arranged at the vertical two ends of the cooling water pipe body; wherein, top connection and lower clutch are the same in structure, all include end cap and joint, the end cap is sealed to be fixed the vertical both ends of cooling water pipe body, the first end of joint is sealed to be fixed on the end cap and with the inside intercommunication of cooling water pipe body, the second end extends the end cap.

12. The self-sustaining one-step method clarification plant of claim 11, wherein the cross section of the plug is set to be the same as the cross section of the cooling water pipe body in the shape of a circular arc diamond, and a joint mounting hole is provided on the plug along the axial direction thereof; the first end of the joint is fixed in the joint mounting hole in a sealing mode.

13. The self-sustaining, one-step process purification apparatus of claim 12, wherein the adaptor mounting hole has an annular groove therein, and a sealing ring is embedded in the annular groove, and the adaptor is screwed into the adaptor mounting hole and abuts against the sealing ring in the annular groove.

14. The self-contained one-step process purification apparatus of claim 2, wherein the end fitting assembly comprises an upper end fitting assembly and a lower end fitting assembly, the upper end fitting assembly and the lower end fitting assembly are sequentially and alternately arranged above and below the cooling water tube bundle along the flue gas flowing direction, and each end fitting penetrates the ends of the cooling water tubes to form a parallel pipeline for at least two rows of parallel water flows to flow in the same direction in the cooling water tube bundle.

15. The self-contained one-step purification apparatus according to claim 14, wherein the upper end assembly is an upper tank, the lower end assembly is a lower tank, the upper tank includes a plurality of upper tank sections as the end fittings arranged above the cooling water tube bundle in the flue gas flowing direction, the lower tank includes a plurality of lower tank sections as the end fittings arranged below the cooling water tube bundle in the flue gas flowing direction, the plurality of rows of cooling water tubes through which each of the water tank sections passes include water inlet tubes and water outlet tubes arranged side by side in the flue gas flowing direction, and the rows of the water inlet tubes and the water outlet tubes are the same.

16. The self-contained one-step purification device according to claim 15, wherein one of the upper water tank and the lower water tank further comprises a cooling water inlet tank communicated with the cooling water inlet, and the other further comprises a cooling water return tank communicated with the cooling water return port, and the cooling water inlet tank and the cooling water return tank are respectively communicated with at least two rows of cooling water pipes.

17. The self-contained one-step purification apparatus according to claim 16, wherein the cooling water tube bundle is divided into a plurality of cooling water tube zones along a flue gas flowing direction, each cooling water tube zone comprises a plurality of rows of cooling water tubes arranged along the flue gas flowing direction, each cooling water tube zone is correspondingly communicated with one group of the cooling water inlet and the cooling water return port, and cooling water among the plurality of cooling water tube zones is not communicated in the cooling water tube bundle.

18. The self-contained one-step purification apparatus of claim 17, wherein the flow rate of cooling water in said cooling water tube section adjacent to said flue gas outlet opening is less than the flow rate of cooling water in said cooling water tube section adjacent to said flue gas inlet opening.

19. A self-contained one-step purification apparatus according to claim 18, wherein the number of said cooling water pipe sections is three, and the flow rate of the cooling water in said cooling water pipe sections decreases in sequence along the flow direction of said flue gas.

20. The self-contained one-step process purification apparatus of claim 18, further comprising a cooling water inlet manifold, said cooling water inlet manifold communicating with each of said cooling water inlets through a flow control valve.

21. The self-contained one-step purification apparatus as claimed in claim 14, wherein the upper end assembly is an upper water tank penetrating the upper ends of all the cooling water pipes, the lower end assembly is a lower water tank penetrating the lower ends of all the cooling water pipes, one of the upper water tank and the lower water tank is connected to the cooling water inlet, and the other is connected to the cooling water return port.

22. The self-contained one-step process purification apparatus of claim 21, wherein the flow rate of cooling water from said flue gas inlet to said flue gas outlet decreases in sequence.

23. The self-contained one-step purification apparatus as claimed in claim 14, wherein said upper header assembly is an upper header tank passing through the upper ends of all the cooling water tubes, and said lower header assembly is a lower header tank comprising a plurality of lower header tank sections arranged in line along the direction of flow of said flue gas, each of said lower header tank sections passing through a plurality of rows of said cooling water tubes; the upper water tank is communicated with a cooling water return port, and each lower water tank is communicated with a cooling water inlet.

24. The self-contained, one-step process purification apparatus of claim 23, further comprising a cooling water inlet manifold in communication with each of said cooling water inlets via a flow control valve.

25. The self-contained one-step purification apparatus according to claim 2, wherein the end fitting assembly is a round pipe elbow assembly which connects the ends of two adjacent cooling water pipes in sequence.

26. The self-sustaining, one-step process cleaning apparatus according to claim 25, wherein said cooling water tube bundle is divided into a plurality of cooling water tube sections along a flue gas flow direction, each of said cooling water tube sections including a plurality of rows of cooling water tubes arranged along said flue gas flow direction; each cooling water pipe area is communicated with a water collecting pipe and a water return pipe.

27. The self-sustaining one-step process clarification plant of claim 2, further comprising a box body, wherein the flue gas inlet and the flue gas outlet are arranged on both sides of the box body; the upper box plate and the lower box plate of the box body are provided with water pipe mounting holes for mounting the upper end part and the lower end part of the cooling water pipe bundle, and the hole wall of each water pipe mounting hole is provided with an annular groove along the circumferential direction; the end part of the cooling water pipe is arranged in the water pipe mounting hole, the part of the cooling water pipe body corresponding to the annular groove is provided with an annular bulge, and the annular bulge is embedded in the annular groove in a sealing manner so that the end part of the cooling water pipe body and the water pipe mounting hole form a curved surface seal.

28. The self-sustaining, one-step process purification apparatus of claim 27, wherein a sealant is disposed within said annular recess.

29. The self-contained one-step process purification apparatus of claim 28, wherein said annular groove is disposed coaxially with said water pipe mounting hole.

30. The self-sustaining one-step process clarification plant of claim 28, wherein a rubber gasket is further disposed in the annular groove, and the annular protrusion abuts the rubber gasket in the annular groove.

31. The self-contained one-step purification apparatus as claimed in claim 27, wherein the annular groove comprises a plurality of grooves circumferentially spaced along the wall of the water pipe installation hole, and the plurality of grooves have the same or different extending depths on the wall of the hole.

32. The self-contained one-step process purification apparatus as claimed in claim 31, wherein said annular grooves are provided in plurality and distributed along the axial direction of said water pipe installation hole.

33. The self-sustaining one-step process purifying apparatus according to claim 32, wherein said annular grooves are provided in two, including a first annular groove and a second annular groove, and a groove opening direction of said first annular groove and a groove opening direction of said second annular groove are inclined in opposite directions in an axial direction of said water pipe installation hole; accordingly, the annular projection includes a first annular projection and a second annular projection, the projections of the first and second annular projections being directed to be inclined in opposite directions in the axial direction of the water pipe mounting hole.

34. The self-contained one-step purification equipment as claimed in claim 31, wherein the cooling water pipe body is further provided with two annular clamping protrusions, the two annular clamping protrusions are located on the inner side and the outer side of the installation foundation, and opposite surfaces of the two annular clamping protrusions abut against the inner side and the outer side of the installation foundation respectively.

35. The self-sustaining one-step process clarification plant of claim 1, further comprising a plurality of demisting water-collecting water-retaining plates vertically arranged at the flue gas outlet, wherein the plates of the demisting water-collecting water-retaining plates are zigzag.

36. The self-contained one-step process purification apparatus of claim 35, wherein at least a portion of the de-mist and catchment baffle is formed with a vertically extending oblong hole along a surface of the de-mist and catchment baffle.

37. The self-contained one-step process purification apparatus of claim 35, further comprising a steel wire mesh disposed outside said de-misting and water-collecting baffle.

38. The self-sustaining one-step-method clarification plant of any one of claims 1-37, wherein the flue gas air temperature of the flue gas inlet is 70-170 ℃, the moisture content of the flue gas is 5-10%, and the escaped ammonia is 9mg/m ³ -200 mg/m ³ The temperature of the cooling water inlet is 26-32 ℃, and the temperature of SO ₂ The content is 5mg/m ³ -100mg/m ³ NOx content of 30mg/m ³ -60 mg/m ³ 、CO ₂ The concentration content is 18-22%, and the dust content is 5mg/m ³ -15mg/m ³ ；

The air temperature of the flue gas at the flue gas outlet is 30-50 ℃, the water content of the flue gas is 3-6%, and the escaped ammonia is 0mg/m ³ -7 mg/m ³ 。

39. A self-contained one-step purification apparatus according to any one of claims 1 to 37, further comprising an atomising device located at the inlet to the flue gas to increase the water content of the flue gas by atomising water thereto.

40. The self-sustaining, one-step process purification apparatus of claim 39, wherein an agent for ammonia removal and/or desulfurization and/or denitrification is added to the atomized water of the atomization device.

41. The self-sustaining one-step process cleaning apparatus according to any one of claims 1-37, further comprising a spray cleaning device disposed at the flue gas inlet for spraying cleaning water into the flue gas, wherein the cleaning water washes the surface of the cooling water pipe of the cryocondensation module along with the flue gas to wash away particles adhered to the surface of the water pipe.

42. The self-contained one-step purification equipment as claimed in claim 2, wherein the box body comprises an upper box plate, a lower box plate, a front box plate and a rear box plate, the upper box plate is hermetically connected with the front box plate and the rear box plate, the lower box plate is hermetically connected with the front box plate and the rear box plate to jointly form the upper and lower front and rear seals of the low-temperature condensation module, and the left and right directions of the purification equipment are the flue gas inlet and the flue gas outlet.

43. The self-contained one-step purification apparatus according to claim 1, further comprising a condensate water collecting device disposed at the bottom of the low-temperature condensation module for collecting the condensate water, wherein the condensate water collecting device is connected to a condensate water discharge port.

44. The self-sustaining one-step process purification apparatus according to claim 1, wherein said acidic contaminants comprise at least one of sulfur dioxide, carbon dioxide, NOx.

45. A purification process using the self-sustaining one-step purification apparatus of any one of claims 1-44, comprising the steps of:

installing the self-sustaining one-step purification equipment to a smoke outlet of smoke emission equipment to be purified, and enabling the smoke air inlet of the self-sustaining one-step purification equipment to be in sealing connection with the smoke outlet of the smoke emission equipment to be purified;

starting the self-holding one-step purification equipment to work, cooling the flue gas to condense the water vapor in the flue gas into condensed water, dissolving the ammonia gas and acidic pollutants in the flue gas into the condensed water to generate acid-base neutralization reaction to generate nonvolatile salt which is easily dissolved in the condensed water.

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