+

WO1998055849A1 - Detection optique d'un gaz piege dans un systeme de refroidissement - Google Patents

Detection optique d'un gaz piege dans un systeme de refroidissement Download PDF

Info

Publication number
WO1998055849A1
WO1998055849A1 PCT/US1998/011793 US9811793W WO9855849A1 WO 1998055849 A1 WO1998055849 A1 WO 1998055849A1 US 9811793 W US9811793 W US 9811793W WO 9855849 A1 WO9855849 A1 WO 9855849A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
detector
light source
probe
electronic signal
Prior art date
Application number
PCT/US1998/011793
Other languages
English (en)
Inventor
Steven R. Green
Original Assignee
Texaco Development Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Texaco Development Corporation filed Critical Texaco Development Corporation
Priority to CA002292561A priority Critical patent/CA2292561A1/fr
Priority to PL98337214A priority patent/PL337214A1/xx
Priority to EP98928926A priority patent/EP0990132A4/fr
Priority to AU80612/98A priority patent/AU741819B2/en
Priority to US09/445,165 priority patent/US6552355B1/en
Priority to JP50301799A priority patent/JP2002505003A/ja
Publication of WO1998055849A1 publication Critical patent/WO1998055849A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/38—Investigating fluid-tightness of structures by using light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light

Definitions

  • the invention relates in general to the field of cooling systems and, more particularly, to pressurized cooling systems and the optical detection of leaks within such systems. Specifically, the invention relates to an optical leak detector for use in a pressurized cooling system for a gasification unit.
  • Gasification is a partial oxidation process that generates gases from the injection of carbonaceous feed, steam, and oxygen.
  • Feed, steam, and oxygen are injected into the gasification chamber through a feed-injector.
  • the feed-injector has a feed channel and one or two oxygen channels so that the feed remains isolated from the oxygen until exiting the feed injector at the feed-injector tip.
  • the temperatures within the gasification chamber typically range from approximately 2000 °F (1093 °C) to approximately 2700 °F (1482 °C).
  • the operation of the gasification chamber depends upon the condition and design of the feed-injector.
  • a cooling system coupled to a cooling jacket or cooling coils around the tip of the feed injector is used to keep the temperature of the feed- injector tip within a given tolerance range.
  • the presence of a leak in the cooling system may allow carbon monoxide, synthesis gas or other gases to enter the cooling system because the gas pressure of the reactor is significantly higher than the pressure in the cooling system. As a result of even a very fine leak, significant gas may enter the cooling system and lead to improper cooling of the feed-injector tip and poor reactor performance.
  • a detection system to detect entrapped gas caused by leaks in the cooling system is important to the safe and efficient operation of a gasification unit.
  • One type of conventional gas detection system that attempts to detect leaks utilizes gas sensitive probes to monitor the presence of gases, such as carbon monoxide, air, and so forth in the cooling system.
  • the coolant typically water or treated cooling water, travels through a coolant supply channel and encounters the feed-injector tip and becomes hot and in turn travels through a coolant return channel.
  • the hot coolant is routed back to a heat exchanger where the heat is removed and the coolant is returned to the coolant supply channel for further use.
  • a leak in the system may cause gases to be entrapped into the cooling system, especially if the leak occurs at the feed injector.
  • the gas bubbles can be caused to naturally float upward into a leak detection channel which is an alternative branch of the return channel.
  • the amount of gas is detected by a gas sensor located at a high point or at the top of the leak detection channel. In the presence of gas, the gas sensor generates an electronic signal that could be routed to a control system; the control system could activate an alarm if the amount of gas present indicates that a leak has occurred within the cooling system and corrective action may be taken.
  • the present invention is generally directed to an optical gas detector for use in cooling systems, particularly cooling systems associated with a gasification unit.
  • the detection system includes a light source, a light detector, a conversion devise, and a control system.
  • the light source should be operatively coupled to a first optical fiber the first optical fiber connecting the light source to a first probe the first probe being functionally effective to transmit light.
  • the light detector should be coupled to a second optical fiber, the second optical fiber connecting the light detector to a second probe, the second probe being functionally effective to receive light from the light source.
  • the conversion device should be operatively coupled to the light detector, the conversion device generating an adjusted electronic signal in response to the light emitted by the light source and received by the light detector.
  • the control system receives the adjusted electronic signal from the conversion device with the control system functionally responding to the electronic signal to provide an indication of at least one leak in the pressurized cooling system.
  • the detection of the leak is due to the variability of the adjusted electronic signal with traversal of a gas bubble across an optical path formed between the light source and the light detector.
  • at least one of the probes is selected from a group consisting of a high-pressure probe, a high-temperature probe and a high-pressure high-temperature probe and preferably at least one of the probes is a sapphire probe.
  • the light source may be a coherent light source or it may be a collimated light source that is not coherent.
  • the light detector may be selected from the group including a photodiode, phototransistor, photomultiplier tube, and a charged-coupled device.
  • Figure 1 illustrates some of the components in a optical gas detection system in accordance with the invention.
  • Figure 2 illustrates a exemplary embodiment of the invention for a high-pressure cooling system.
  • Figure 3 illustrates a conversion device used in the embodiment shown in Figure 2.
  • Figure 4 illustrates another illustrative embodiment of the invention for a low-pressure cooling system.
  • Figure 1 illustrates some of the components of an optical gas detector 200 in accordance with the invention.
  • Light source 203 is aligned with light detector 205 such that an optical path 210 is formed between them.
  • the optical path 210 transverses a coolant channel 211, which is defined by a coolant channel pipe through which coolant flows.
  • the coolant may be any fluid that is suitable for such use including aqueous solutions in which corrosion treatment compounds have been dissolved.
  • Light source 203 may be any type of coherent or incoherent source of electromagnetic radiation (e.g., a laser or a xenon lamp). If an incoherent light source is used, it is preferred that it be collimated by conventional collimating means such as lenses or apertures.
  • Light detector 205 may be any type of conventional light detector (e.g., a photodiode, a phototransistor, a photomultiplier tube, or a charge coupled device). Light detector 205 generates an electronic signal corresponding to the amount of light received from light source 203. Conversion device 215 converts the electronic signal received from light detector 205 into an adjusted electronic signal (e.g., 4-20 mA electronic signal) which is routed to a control system 220.
  • an adjusted electronic signal e.g., 4-20 mA electronic signal
  • gases can enter the cooling system when the pressure of the gas is greater than the pressure of the cooling system.
  • the pressure of the gas in a gasifier reactor is much higher than the pressure in the cooling jacket or cooling coils employed to cool the feed injector tip.
  • the presence of gas in the cooling system generate bubbles in the coolant and thus in the coolant channel.
  • the detection of bubbles within the coolant channel can indicate the presence of a leak in the cooling system.
  • the present invention utilizes the detection of bubbles in the coolant as an early indicator of a leak in the cooling jacket or cooling coils of the feed injector tip. If bubbles are detected, the control system compares the difference between the received signal to a reference signal to determine if there is a leak. If the comparison indicates a leak, the control system activates an alarm to alert operations personnel to the presence of a leak.
  • FIG. 2 illustrates an embodiment of the invention used in a high-pressure cooling system 300.
  • High pressure as used in this application means pressures from approximately 400 to approximately 1000 psig.
  • the high-pressure system includes channel pipe 303, power supply 305, light source 310, light source 315, detector 320, detector 325, and conversion device 340.
  • Channel pipe 303 encloses the coolant channel through which coolant flows in the cooling system.
  • Figure 2 illustrates a cross-sectional view of the channel pipe.
  • the channel pipe is designed with four threaded orifices (not shown) in which the light probes, or alternatively the light sources and detectors themselves, are connected.
  • a light source/light detector pair (e.g., 310 and 320) are connected in opposing orifices such that they form optical path 330. Similarly, light source 315 and light detector 325 form optical path 335. Any object that traverses an optical path will scatter the light in multiple directions.
  • One skilled in the art will realize that the number and the placement of the pairs of orifices in Figure 2 has been done for illustrative purposes.
  • the light sources and light detectors of Figure 2 are connected to the channel pipe via four conventional optical fibers.
  • the interface between the channel pipe and the optical fibers are probes should be conventional connectors used for such purposes and are not shown.
  • the probes are conventional sapphire probes that can be selected to have either a high-pressure, high- temperature, or high-pressure, high-temperature tolerance.
  • High-temperature as used in this application relates to temperatures greater than the atmospheric boiling point of water and preferably values greater than approximately 500°F (260 C).
  • the use of probes and optical fibers allows the remote placement of the light sources and light detectors. However, an alternative embodiment could result from directly connecting the light sources and detectors to the channel pipe.
  • a laser diode is utilized as the light source and a feedback loop including a beam-splitter and detector may be used to prevent the attenuation of the laser diode overtime.
  • the initial laser beam generated from the laser diode is split and part is used to detect leaks while the other part is reflected back to a detector.
  • the signal from the detector may be amplified and used in a feedback system to the laser diode power supply so as to maintain a constant intensity of light. In this manner, the attenuation of the light source overtime may be reduced.
  • a band pass filter in front of the light detector may also be utilized in the present invention to prevent stray or scattered light from reaching the detector.
  • Each of the detectors (i.e., detector 320 and detector 325) is connected to conversion device 340 which receives signals corresponding to the amount of light detected.
  • Figure 3 shows an enlarged view of conversion device 340.
  • the conversion device receives a signal from detector 320 along line 400 and a signal from detector 325 along line 405.
  • Conversion device 340 includes amplifiers 410 and 415, adder 420, and transducer 425.
  • Amplifier 410 amplifies the electronic signal received from detector 320 along line 400; similarly, amplifier 415 amplifies the electronic signal received from detector 325 along line 405.
  • the two amplified signals are sent to adder 420.
  • Adder 420 combines the two amplified signals to generate a combined electronic signal which is routed to transducer 425.
  • the transducer generates an adjusted electronic signal (e.g., a 4-20 raA signal) which can be routed to a control system (not shown).
  • the control system can analyze the signal received from the transducer to determine if a leak is present in the cooling system. If the control system has determined that a leak is present, an appropriate alarm can be activated before the feed-injector tip becomes damaged.
  • Scattering causes the emitted light to travel in multiple directions; thus, detector 320 will receive less light because only a small portion of the light will be in the direction of detector 320. Similar results occur when a bubble traverses optical path 335.
  • the detection of a smaller amount of light causes the electronic signal generated by detector 320 to be smaller.
  • a smaller signal is amplified and a smaller signal is generated by the transducer.
  • the difference between signals from an unobstructed optical path and signals from an obstructed optical path can be compared by a control system. If the signal differential is greater than a specified value, the bubbles indicate the presence of a leak in the cooling system.
  • the control system activates an alarm in response to the detection of a leak.
  • both light source/light detector pairs could be used simultaneously to indicate if a leak is present in the cooling system. Simultaneous use of both light detectors (i.e., 320 and 325) would provide better resolution enabling more efficient detection of a slow leak which generates fewer bubbles.
  • a second embodiment of the invention which can be used in a low-pressure cooling system 500 is illustrated in Figure 4.
  • Low pressure as defined in this application relates to pressures less than approximately 400 psig.
  • the low-pressure system includes coolant channel 505, escape path 510, power supply 305, light source 310, light detector 320, conversion device 500, and sight tube 515.
  • the low-pressure system functions similarly to the high-pressure system.
  • a portion of coolant channel 505 is shown in Figure 4 with escape path 510 which allows some fluid to leave the coolant channel.
  • a sight tube 515 is connected to escape path 510.
  • Light source 310 and light detector 320 are placed on opposite sides of the sight tube such that optical path 520 is formed; a portion of optical path 520 is within sight tube 515.
  • Conversion device 500 includes an amplifier and a transducer. When the electronic signal generated by detector 320 is received by conversion device 510, the electronic signal becomes amplified and converted into an adjusted electronic signal (e.g., a 4-20 mA signal) that can be received by the main control system (not shown). Leaks in the cooling system cause bubbles to form in the coolant channel.
  • a control system analyzes the signal differential corresponding to the amount of light received with bubbles in the optical path to the amount of light received without bubbles in the optical path. If the signal differential is greater than a specified value, the control system activates an alarm because a leak has been detected.
  • the present invention uses bubbles as indicators; the detection of bubbles provide early detection of leaks in a pressurized cooling system for a gasification unit.
  • the present invention also allows the detection of various types of gases (e.g., carbon monoxide and hydrogen) which may have entered the coolant channel through the feed- injector tip or in the synthesis gas cooling heat exchangers.
  • gases e.g., carbon monoxide and hydrogen
  • the gas detection system of the present invention need no be limited to use on cooling systems associated with synthesis gas reactors.
  • gas will be entrapped in the cooling system.
  • the gas detection system of the present invention may be used in any of these situations in which cooling systems are at a lower pressure than the surrounding gas..
  • the present invention does not require significant amounts of additional piping.
  • the invention utilizes pre-existent piping.
  • the components of the present invention are common and relatively inexpensive. The cost associated with the light sources and light detectors reduces the equipment cost of the cooling system by more than five percent over conventional cooling systems equipped with gas monitoring equipment.
  • one illustrative embodiment of the present invention is an optical leak detector for use in a pressurized cooling system in which the cooling system includes at least one coolant channel through which coolant flows.
  • the detector includes a light source, a light detector, a conversion device and a control system.
  • the light source should be operatively coupled to a first optical fiber which connects the light source to a first probe, the first probe being functionally effective to transmit light.
  • the light source is a coherent light source such as a laser, but it may also be a non-coherent light source that is collimated to form a beam of light.
  • the light detector should be coupled to a second optical fiber, the second optical fiber connecting the light detector to a second probe which should be functionally effective to receive light from the light source.
  • the probes may be selected from a group including a high-pressure probe, a high- temperature probe and a high-pressure high-temperature probe, more preferably the probe may be a sapphire probe resistant to high pressure and temperature and the other properties of the coolant.
  • the light detector may be selected from the group including a photodiode, phototransistor, photomultiplier tube, and a charged-coupled device.
  • the conversion device should be operatively coupled to the light detector. The conversion device generates an adjusted electronic signal in response to the light emitted by the light source and received by the light detector.
  • the adjusted electronic signal functionally varies with traversal of a bubble in the coolant across an optical path formed between the light source and the light detector.
  • the conversion device includes an amplifier coupled to the first light detectors, the amplifier being functionally effective at amplifying electronic signals from the light detectors.
  • the conversion devise further includes a transducer coupled to the amplifier, the transducer should be functionally effective to receive the electronic signal from amplifier and generate the adjusted electronic signal for the control system.
  • the adjusted electronic signal from the conversion device is received by the control system which functionally responds to the electronic signal to provide an indication of a leak in the cooling system.
  • the optical leak detector for a low-pressure cooling system, the low-pressure cooling system including at least one coolant channel through which coolant flows.
  • the optical leak detector includes a light source, a light detector, an escape tube, a conversion device and a control system.
  • the light source should be operatively coupled to a first optical fiber which connects the light source to a first probe which is functionally effective to transmit light.
  • the light source should be a coherent light source, however it may also be a non-coherent light source which has been collimated.
  • the light detector should be coupled to a second optical fiber, the second optical fiber connecting the light detector to a second probe.
  • the second probe should be functionally effective to receive light from the light source and transmit it to the light detector.
  • the light detector should be selected from the group including a photodiode, phototransistor, photomultiplier tube, and a charged-coupled device.
  • the escape tube is coupled to the cooling channel and functionally effective to receive coolant and any entrapped bubbles from the coolant channel. Further the escape tube should be positioned between the first and the second probes and intersecting at least part of the optical path formed between the two probes. Preferably the escape tube is a high-pressure sight tube.
  • the conversion device should be, operatively coupled to the light detector, the conversion device generating an adjusted electronic signal in response to light emitted by the light source and received by the light detector.
  • the conversion device includes an amplifier coupled to the first light detector, the amplifier should be functionally effective at amplifying electronic signals from the light detector; and a transducer coupled to the amplifier, the transducer should be functionally effective to receive the electronic signal from amplifier and generate the adjusted electronic signal for the control system.
  • the adjusted electronic signal functionally varies with traversal of a bubble in the coolant across an optical path formed between the light source and the light detector, entrapped air or gas may be detected.
  • the adjusted electronic signal is sent to the which functionally responds to the adjusted electronic signal to provide an indication of a leak in the low-pressure cooling system.
  • the control system may then trigger an alarm and take automated and preprogrammed corrective action as needed.
  • Yet another illustrative embodiment of the present invention is an optical leak detector for a high-pressure cooling system, especially such a system as used in a gasification unit.
  • the cooling system should include at least one cooling channel through which coolant flows, however it may contain may such channels.
  • the optical leak detector of the present illustrative embodiment includes: a first light source, a first light detector, a second light source, a second light detector, a channel pipe, which defines the cooling channel, a conversion device and a control system.
  • the first light source should be operatively coupled to a first optical fiber which connects the first light source to a first probe, the first probe being functionally effective to transmit light.
  • the first light detector should be coupled to a second optical fiber, the second optical fiber connecting the first light detector to a second probe, the second probe being functionally effective to receive light from the first light source.
  • the first light source is optically coupled to the first light detector by an optical path which is created between the two within the cooling channel.
  • the second light source should be operatively coupled to a third optical fiber which connects the second light source to a third probe.
  • the third probe like the first probe should be functionally effective to transmit light.
  • the second light detector should be coupled to a fourth optical fiber, the fourth optical fiber connecting the second light detector to a fourth probe. Like the second probe, the fourth probe should be functionally effective to receive light from the second light source.
  • the second light source is optically coupled to the second light detector by an second optical path which is created between the two within the cooling channel.
  • the second optical path may be parallel, perpendicular or in a different plane that the first optical path described above.
  • the light sources may be coherent light sources such as lasers, or they may be non-coherent light sources that have been collimated into beams of light.
  • the channel pipe defines the coolant channel, but it also serves to align the light source probes with the light detection probes.
  • the channel pipe has four threaded orifices, the threaded orifices operatively coupled to the probes and aligning the probes as described above.
  • the probes may be selected from a group consisting of a high-pressure probe, a high-temperature probe and a high-pressure high-temperature probe, but preferably the probes are sapphire probes which are capable of withstanding the high pressures and temperatures encountered.
  • the conversion device should be operatively coupled to the both the first and the second light detector. The role of the conversion device is to generate an adjusted electronic signal in response to light emitted by the light sources and received by the light detectors. The adjusted electronic signal functionally varies with traversal of a bubble in the coolant across one or both of the optical paths formed between the light sources and the light detectors.
  • the conversion device includes at least two amplifiers coupled to the first and second light detectors, the amplifiers being functionally effective at amplifying electronic signals from the first and second light detectors.
  • the light detectors are selected from the group consisting of a photodiode, phototransistor, photomultiplier tube, and a charged-coupled device.
  • the conversion device further includes an adder which should be functionally effective to generate a combined electronic signal in response to adding an electronic signal from the first light detector to an electronic signal from the second light detector.
  • the conversion device includes a transducer coupled to the adder, the transducer should be functionally effective to receive the combined electronic signal from the adder and generate the adjusted electronic signal for the control system.
  • the control system receives the adjusted electronic signal from the conversion device and functionally responds to the electronic signal to provide an indication of at least one leak in the high-pressure cooling system. This response may include the triggering of alarms and the automated predetermined actions needed in response.
  • the present invention also encompasses a method of optically detecting leaks in a cooling system.
  • a method includes: transmitting light from a light source; detecting light transmitted from the light source; generating an adjusted electronic signal in response to detected light; and analyzing the electronic signal to determine if a leak is present in the cooling system. Because the adjusted electronic signal functionally varies with traversal of a bubble in the coolant across an optical path formed between the light source and the light detector, the electronic signal may be analyzed by a control system and if necessary the control system activates an alarm indicating a leak in the cooling system.
  • the light source is a coherent light source or it may be an incoherent light source which has be collimated.
  • the light detector utilized in the method may be a photodiode, phototransistor, photomultiplier tube, or a charged-coupled device.

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Dispersion Chemistry (AREA)
  • Examining Or Testing Airtightness (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Abstract

La présente invention concerne un détecteur optique (200) de fuite utilisé dans un système de refroidissement. Le détecteur optique de fuite comprend une source lumineuse (203), un détecteur de lumière (205) et un dispositif de conversion (215). La source lumineuse est couplée optiquement au détecteur de lumière à l'aide d'un parcours optique (210). Le détecteur de lumière produit un signal électronique en réponse à la lumière provenant de la source lumineuse. Le dispositif de conversion relié au détecteur de lumière produit un signal électronique, en réponse à la quantité de lumière provenant de la source lumineuse. Ce signal électronique indique la présence d'une fuite dans le système de refroidissement par la transversale d'une bulle de gaz piégée sur le parcours optique, formé par la source lumineuse et le détecteur de lumière.
PCT/US1998/011793 1997-06-06 1998-06-05 Detection optique d'un gaz piege dans un systeme de refroidissement WO1998055849A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CA002292561A CA2292561A1 (fr) 1997-06-06 1998-06-05 Detection optique d'un gaz piege dans un systeme de refroidissement
PL98337214A PL337214A1 (en) 1997-06-06 1998-06-05 Optical detectionb of gas entrapped in a cooling system
EP98928926A EP0990132A4 (fr) 1997-06-06 1998-06-05 Detection optique d'un gaz piege dans un systeme de refroidissement
AU80612/98A AU741819B2 (en) 1997-06-06 1998-06-05 Optical detection of entrapped gas in a cooling system
US09/445,165 US6552355B1 (en) 1997-06-06 1998-06-05 Optical detection of entrapped gas in a cooling system
JP50301799A JP2002505003A (ja) 1997-06-06 1998-06-05 冷却装置内に入り込んだガスの光学的検知

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US4879997P 1997-06-06 1997-06-06
US60/048,799 1997-06-06

Publications (1)

Publication Number Publication Date
WO1998055849A1 true WO1998055849A1 (fr) 1998-12-10

Family

ID=21956507

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/011793 WO1998055849A1 (fr) 1997-06-06 1998-06-05 Detection optique d'un gaz piege dans un systeme de refroidissement

Country Status (8)

Country Link
EP (1) EP0990132A4 (fr)
JP (1) JP2002505003A (fr)
KR (1) KR20010013495A (fr)
CN (1) CN1264469A (fr)
AU (1) AU741819B2 (fr)
CA (1) CA2292561A1 (fr)
PL (1) PL337214A1 (fr)
WO (1) WO1998055849A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7372063B2 (en) * 2002-11-26 2008-05-13 Sc2N Societe Anonyme Optical detector for the presence of gas bubbles in a liquid

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102128771A (zh) * 2010-12-20 2011-07-20 中国石油大学(北京) 高温气溶胶检测导管
CN102141499A (zh) * 2010-12-20 2011-08-03 中国石油大学(北京) 高压气溶胶检测导管
CN102539091A (zh) * 2011-12-21 2012-07-04 合肥工业大学 一种用于袋式除尘器的滤袋破损检测装置
CN105424331B (zh) * 2014-09-18 2019-07-05 中国石油化工股份有限公司 用于大型压裂时水泥环的机械密封性评价的装置和方法
CN106197896B (zh) * 2016-08-10 2018-11-23 怡维怡橡胶研究院有限公司 一种轮胎内胎或内衬层气密性测定装置及气密性测定方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3935876A (en) * 1974-11-15 1976-02-03 Renal Systems, Inc. Air leak detector
US5241368A (en) * 1991-01-07 1993-08-31 Custom Sample Systems, Inc. Fiber-optic probe for absorbance and turbidity measurement
US5263361A (en) * 1988-08-22 1993-11-23 Gates Donald C Apparatus for leak testing a fluid containing chamber utilizing a laser beam

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56112626A (en) * 1980-02-11 1981-09-05 Toshiba Corp Detecting device for leakage of fluid in nuclear power plant
JPS5755769A (en) * 1980-09-18 1982-04-02 Toshiba Corp Detector for leakage of water from water-cooled type thyristor valve
JPS5875041A (ja) * 1981-10-30 1983-05-06 Showa Electric Wire & Cable Co Ltd 漏水検知方法
JPH0311955A (ja) * 1989-06-06 1991-01-21 Toshiba Corp 冷却装置
JPH0989422A (ja) * 1995-09-21 1997-04-04 Hitachi Bill Shisetsu Eng Kk 密閉循環系内に封入されている液体の漏出監視方法及び同装置
JPH1048064A (ja) * 1996-08-08 1998-02-20 Mitsubishi Electric Corp 水冷式電気機器の温度センサ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3935876A (en) * 1974-11-15 1976-02-03 Renal Systems, Inc. Air leak detector
US5263361A (en) * 1988-08-22 1993-11-23 Gates Donald C Apparatus for leak testing a fluid containing chamber utilizing a laser beam
US5241368A (en) * 1991-01-07 1993-08-31 Custom Sample Systems, Inc. Fiber-optic probe for absorbance and turbidity measurement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0990132A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7372063B2 (en) * 2002-11-26 2008-05-13 Sc2N Societe Anonyme Optical detector for the presence of gas bubbles in a liquid

Also Published As

Publication number Publication date
CN1264469A (zh) 2000-08-23
EP0990132A4 (fr) 2000-07-26
KR20010013495A (ko) 2001-02-26
CA2292561A1 (fr) 1998-12-10
EP0990132A1 (fr) 2000-04-05
JP2002505003A (ja) 2002-02-12
PL337214A1 (en) 2000-08-14
AU741819B2 (en) 2001-12-13
AU8061298A (en) 1998-12-21

Similar Documents

Publication Publication Date Title
US11823805B2 (en) Acousto-optic leakage monitoring system for nuclear power plant main steam pipeline
US6552355B1 (en) Optical detection of entrapped gas in a cooling system
CN209621401U (zh) 一种基于温度场分布式光纤监测的预警系统
EP0069930A1 (fr) Installation de surveillance pour systèmes laser transmettant le rayon laser à travers des fibres optiques
AU741819B2 (en) Optical detection of entrapped gas in a cooling system
CN111189592A (zh) 酸性介质输送管道泄漏分布式光纤检测系统及其检测方法
GB2097529A (en) Detecting oil in water
CN108375555A (zh) 光纤甲烷传感模块、光纤多点光电式甲烷传感器及系统
CN109087719A (zh) 一种安全壳内主蒸汽管道泄漏监测系统
KR102684604B1 (ko) 변압기의 유중 가스 분석 시스템 및 그에 사용되는 유중 가스 측정 모듈
JPH04151546A (ja) ガス検出装置
CN119246454B (zh) 一种基于热辐射背景的co激光探测系统
CN204573600U (zh) 基于分布式光纤测温的核电厂管道泄漏探测装置
NO159424B (no) Fotoelektrisk roekdetektor.
MXPA99011279A (en) Optical detection of entrapped gas in a cooling system
CN113218592A (zh) 一种电厂锅炉管式ggh泄漏监测方法和系统
CN211477522U (zh) 酸性介质输送管道泄漏分布式光纤检测系统
JPH0443934A (ja) 漏洩検出装置
CZ9904298A3 (cs) Optická detekce plynu zachyceného v chladicím systému
CN212083225U (zh) 一种光纤气体检测装置及光纤传感器
CN209747139U (zh) 一种用于核电厂主蒸汽管道的声光结合泄漏监测系统
US5059383A (en) Sodium leak detection system for liquid metal cooled nuclear reactors
CN209624385U (zh) 一种光纤气体传感器激光器波长精密监控装置
JPS62273436A (ja) 混合ガスの成分ガス濃度の検知方法およびその装置
RU2315230C1 (ru) Система для контроля утечки газа из магистрального газопровода

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 98807307.2

Country of ref document: CN

AK Designated states

Kind code of ref document: A1

Designated state(s): AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GE GH GM GW HU ID IL IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG US UZ VN YU ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW SD SZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN ML MR NE SN TD TG

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
ENP Entry into the national phase

Ref document number: 2292561

Country of ref document: CA

Ref document number: 2292561

Country of ref document: CA

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: PV1999-4298

Country of ref document: CZ

WWE Wipo information: entry into national phase

Ref document number: PA/a/1999/011279

Country of ref document: MX

Ref document number: 1019997011501

Country of ref document: KR

Ref document number: 80612/98

Country of ref document: AU

WWE Wipo information: entry into national phase

Ref document number: 1998928926

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 09445165

Country of ref document: US

WWP Wipo information: published in national office

Ref document number: 1998928926

Country of ref document: EP

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

WWP Wipo information: published in national office

Ref document number: PV1999-4298

Country of ref document: CZ

WWP Wipo information: published in national office

Ref document number: 1019997011501

Country of ref document: KR

WWG Wipo information: grant in national office

Ref document number: 80612/98

Country of ref document: AU

WWW Wipo information: withdrawn in national office

Ref document number: 1998928926

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: PV1999-4298

Country of ref document: CZ

WWW Wipo information: withdrawn in national office

Ref document number: 1019997011501

Country of ref document: KR

点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载