RU2537585C2 - Method for air cleaning, and device for its implementation - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: method of air cleaning involves alternate passing of air under cleaning through adsorbent located in at least two adsorbers. At that operation of one adsorber is performed in drying mode, and operation of the other adsorber is performed in regeneration mode. Regeneration mode of one of adsorbers is performed using part of air consumption dried in the other adsorber. Dry air of regeneration mode is supplied to regenerated adsorber by counter flow in relation to air flow supplied to the same adsorber in drying mode. On the way of regeneration air flow, in outlet of adsorber housing, installed is a profiled washer-filter used for formation of cavity for condensate collection. Internal surface of flange with nozzle for delivery of air under cleaning to cavity of housing with adsorbent is designed profiled, preferably conical. The top of cone is directed to nozzle inlet, and on the specified surface there made are profiled channels in the form of alternating rings of various diameters. For this method implementation proposed is a device containing at least two adsorbers with adsorbent interconnected by pipeline system. Each adsorbent includes a housing designed as a hollow cylinder, profiled flanges with nozzles installed on both ends of housing for supply and extraction of dried air, longitudinal stringers installed inside the housing, valves with control system providing switching of adsorbers from drying mode to regeneration mode, throttle with pipeline of dried air delivery under reduced pressure to regenerated adsorber and the main condensate collector with valve for moisture carrying. In pipeline system there installed is an additional condensate collector and at least in one adsorber, preferably in two ones, before the flange with nozzle for air supply to adsorber cavity there installed is a profiled washer-filter forming cavity for condensate, at that this cavity is connected to cavity of additional condensate collector. In this version internal surface of the flange with nozzle for air supply to adsorber cavity is designed profiled, preferably conical. The top of cone is directed to nozzle inlet. On the specified surface there made are profiled channels in the form of alternating rings of various diameters.

EFFECT: manufacturing drying unit with adsorber, which design allows excluding condensed moisture occurrence on adsorbent crystals.

2 cl, 2 dwg

Description

The invention relates to air purification and can be used in gas, oil, petrochemical and other industries.

Known devices for cleaning and drying air, including two adsorbers connected by pipelines that are connected to valves, providing switching of their operating modes from the drying mode to the regeneration mode on command from the valve control system (see Japanese application N 61-35891 B, MKI B01D 53/26, 53/02 of 08/08/15; application EPO N 0212101, MKI B01D 53/04, 53/26 of 87.03.04; application of Germany N 3514473, MKI B01D 53/26 of 86.10.23).

A device for cleaning and drying compressed air (application Germany N 3304722, class B01D 53/26), containing two adsorbers connected by pipelines with valves installed on them, which provide alternating adsorbers from drying mode to regeneration mode, a throttle with a supply pipe dried gas under reduced pressure into a regenerated adsorber and a moisture separator with a moisture drain valve opening according to the rhythm of switching adsorbers.

A disadvantage of the known device is that the accumulated condensate is released into the environment, as well as at high pressure, therefore, the use of this device is impossible when drying, for example, natural gas, where the condensate may contain components that are harmful to the human body and harmful to the environment Wednesday

A device is known for drying compressed gas, including air, including two adsorbers connected by pipelines containing valves, which switch adsorbers from drying mode to regeneration mode, a throttle with a pipeline for supplying dried gas at reduced pressure to a regenerated adsorber and a moisture separator with a dehumidifier valve in which the dehumidifier is divided into two tanks: a high pressure tank, in the cavity of which a check valve is placed mechanically connected to the float device , and a low-pressure tank with an autonomously controlled dehumidifier valve equipped with a safety valve (RF patent No. 2165786, IPC B01D 53/26).

The device operates as follows.

Wet gas with condensate enters the primary condensate collector, where condensate accumulates. Separated from the condensate, the moist gas enters one of the adsorbers operating alternately: one in the drying mode, the other in the regeneration mode. Switching of the adsorbers from the drying mode to the regeneration mode, as it is saturated with moisture, is provided by means of control valves.

For the regeneration of the adsorber, a part of the dried gas is used, which is passed through the regenerated adsorber at reduced pressure due to throttling by the throttle. In the regeneration mode, part of the dry gas is fed back to the adsorber. Gas passing through the inner cavity of the adsorber and the adsorbent layer is saturated with moisture. Having reached the upper flange of the casing having a temperature different from the gas temperature, the moist gas condenses on the inner surface of the flange. Drops of condensate flowing down from the surface of the flange fall onto the upper layers of the adsorbent, which leads to waterlogging, partial clogging or cracking of the surface of the adsorbent granules.

The main disadvantage of this adsorber is that droplets of condensed moisture, falling on the adsorbent layer, are absorbed by the adsorbent granules, which leads to accelerated destruction of the adsorbent and shorten the life of the entire adsorber as a whole.

The task of the invention is to eliminate these drawbacks and create a method of air purification, the use of which will eliminate the ingress of drip moisture onto the adsorbent granules.

The problem is achieved in that in the proposed method of air purification, which consists in alternately passing the cleaned air through an adsorbent located in at least two adsorbers, while the operation of one adsorber is carried out in the drying mode, and the second adsorber is in the regeneration mode, according to the invention, the mode the regeneration of one of the adsorbers is carried out part of the air flow, which has passed drying in the other adsorber, while the dry air of the regeneration mode is supplied to the regenerated adsorber in a current direction with respect to the air flow supplied to the same adsorber in the drying mode, and on the path of the regeneration air flow, in the outlet part of the adsorber body, a profiled filter washer is installed, with the help of which a cavity for collecting condensate is formed, while the inner surface of the flange with the nozzle for supplying the cleaned air into the cavity of the body with the adsorbent is shaped, predominantly conical, with the top of the cone facing the inlet of the nozzle, while on this surface they take profiled grooves in the form of alternating rings of various diameters.

To implement this method, a device is proposed that according to the invention contains at least two adsorbers with an adsorbent connected to each other by a piping system, each adsorber comprising a housing mainly made in the form of a hollow cylinder, profiled flanges with fittings installed on both ends of the housing for supply and drainage of drained air, longitudinal ribs installed inside the body, valves with a control system for switching adsorbers from drying mode to re a choke with a pipeline for supplying dried air under reduced pressure to the regenerated adsorber and the main condensate collector with a drain valve, while an additional condensate collector is installed in the piping system, and at least in one adsorber, preferably in both, in front of the flange with a nozzle for supplying air into the cavity adsorber, a profiled washer-filter is installed, forming a cavity for condensate, and this cavity is connected to the cavity of the additional condensate collector.

In an embodiment, the inner surface of the flange with a nozzle for supplying air into the adsorber cavity is shaped, preferably conical, with the top of the cone facing the inlet of the nozzle, and on this surface, shaped grooves are made in the form of alternating rings of different diameters.

The invention is illustrated in the drawing, where figure 1 shows a schematic diagram of a block of drying air, figure 2 is a longitudinal section of an adsorber.

A device for implementing the proposed method consists of adsorbers 1 and 2, the main condensate collector 3, control valves 4 and 5, designed to periodically switch the adsorbers, as they are saturated with moisture, from the drying mode to the regeneration mode; chokes 6 and 7 with pipelines for supplying dried low-pressure air to the regenerated adsorber, additional condensate collector 8.

The adsorber 1 contains a housing 9, mainly made in the form of a hollow cylinder, profiled flanges 10 and 11 with fittings 12 and 13, respectively, installed from both ends of the housing 9 for supplying and draining drained air. Inside the housing 1, longitudinal ribs are installed 14. In front of the flange 10 with a fitting 12 for supplying air into the adsorber cavity, a profiled washer-filter 15 is installed, which forms a cavity 16 for condensate, and this cavity 16 is connected to the cavity of the additional condensate collector 8.

The proposed method using the specified device can be implemented as follows.

Wet air with condensate is supplied to the main condensate collector 3, where the condensate accumulates. The moist air separated from the condensate is supplied to one of the adsorbers 1 or 2, which operate alternately: one in the drying mode, the other in the regeneration mode.

Switching the adsorbers from the drying mode to the regeneration mode, as they are saturated with moisture, is ensured by means of control valves 4 and 5. To regenerate the adsorbers, both 1 and 2 use part of the drained air, which at reduced pressure, due to throttling with a throttle 6 or 7, passed through a regenerated adsorber.

In the drying mode, moist air is fed into the housing 9 of the adsorber 1 from above, through the nozzle 12, after which it passes through the adsorbent layer, is dried and leaves the adsorber through the nozzle 13.

In the regeneration mode, part of the dry air is fed into the inner cavity of the adsorber casing 1 in the opposite direction, through the nozzle 13. Air passing through the inner cavity of the adsorber casing 1 and the adsorbent layer is saturated with moisture. Having reached the upper flange 10 having a temperature different from the air temperature, moist air condenses on the inner surface of the flange. Drops of condensate, flowing down from the surface of the flange 10, accumulate on the surface of the profiled filter washer 15, and accumulate in the cavity 16, from where they are removed through the nozzle into an additional condensate collector 8.

In an embodiment, moisture droplets flowing down the conical surface of the flange 10 fall onto the profiled grooves 17 and break down under the influence of gravity, which allows localization of the places where droplet moisture is collected.

The installation of a profiled washer filter 15 will protect the upper layers of the adsorbent from contact with drip moisture, improve drainage conditions and thereby increase the service life of the adsorbent.

Using the proposed technical solution will improve the working conditions of the adsorbent and thereby increase the service life of the adsorber and the drying unit as a whole.

Claims (2)

1. The method of air purification, which consists in alternately passing the purified air through an adsorbent located in at least two adsorbers, while the operation of one adsorber is carried out in the drying mode, and the second adsorber is in the regeneration mode, characterized in that the regeneration mode of one of the adsorbers carry out part of the air flow, dried in another adsorber, while the dry air of the regeneration mode is fed into the regenerated adsorber in countercurrent with respect to the air flow, Go to the same adsorber in the drying mode, and on the path of the regeneration air flow, in the output part of the adsorber body, a profiled filter washer is installed, with which a cavity is formed to collect condensate, while the inner surface of the flange with a fitting for supplying cleaned air to the cavity the case with the adsorbent is conical, with the top of the cone facing the inlet of the nozzle, while profiled grooves are made on the indicated surface in the form of alternating rings of different diameters. 2. The device for implementing the method according to claim 1, characterized in that it contains at least two adsorbers with an adsorbent connected to each other by a piping system, each adsorber comprising a housing mainly made in the form of a hollow cylinder, profiled flanges with fittings installed from both ends of the casing for supplying and discharging drained air, longitudinal ribs installed inside the casing, valves with a control system for switching adsorbers from the drying mode to the regeneration mode, throttling sel with a pipeline for supplying dried air at reduced pressure to the regenerated adsorber and the main condensate collector with a drain valve, while an additional condensate collector is installed in the piping system, and in at least one adsorber, preferably in both, in front of the flange with a fitting for supplying air to the adsorber cavity, a profiled washer filter is installed, forming a cavity for condensate, and the specified cavity is connected to the cavity of the additional condensate collector, while the internal the surface of the flange with a fitting for supplying air into the adsorber cavity is made conical, with the top of the cone facing the inlet of the fitting, and profiled grooves made in the form of alternating rings of different diameters are made on the indicated surface.

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