CN109539810A - The control method for the safety system for preventing liquefied ammonia from spreading - Google Patents

The control method for the safety system for preventing liquefied ammonia from spreading Download PDF

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Publication number
CN109539810A
CN109539810A CN201811549401.7A CN201811549401A CN109539810A CN 109539810 A CN109539810 A CN 109539810A CN 201811549401 A CN201811549401 A CN 201811549401A CN 109539810 A CN109539810 A CN 109539810A
Authority
CN
China
Prior art keywords
ammonia
spray
control cabinet
ammonia detector
ball valve
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
CN201811549401.7A
Other languages
Chinese (zh)
Inventor
汪鹏飞
陈永波
徐刚
王礼龙
王其辉
俞庆
周湘
夏雁飞
汪晓明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anhui Conch Construction Materials Design Institute Co Ltd
Baimashan Cement Plant of Anhui Conch Cement Co Ltd
Anhui Conch Holdings Co Ltd
Original Assignee
Anhui Conch Construction Materials Design Institute Co Ltd
Baimashan Cement Plant of Anhui Conch Cement Co Ltd
Anhui Conch Holdings Co Ltd
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 Anhui Conch Construction Materials Design Institute Co Ltd, Baimashan Cement Plant of Anhui Conch Cement Co Ltd, Anhui Conch Holdings Co Ltd filed Critical Anhui Conch Construction Materials Design Institute Co Ltd
Priority to CN201811549401.7A priority Critical patent/CN109539810A/en
Publication of CN109539810A publication Critical patent/CN109539810A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62CFIRE-FIGHTING
    • A62C3/00Fire prevention, containment or extinguishing specially adapted for particular objects or places
    • A62C3/06Fire prevention, containment or extinguishing specially adapted for particular objects or places of highly inflammable material, e.g. light metals, petroleum products
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/18Absorbing units; Liquid distributors therefor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D21/00Arrangements of monitoring devices; Arrangements of safety devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D21/00Arrangements of monitoring devices; Arrangements of safety devices
    • F27D21/04Arrangements of indicators or alarms
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02Alarms for ensuring the safety of persons
    • G08B21/12Alarms for ensuring the safety of persons responsive to undesired emission of substances, e.g. pollution alarms
    • G08B21/16Combustible gas alarms
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D21/00Arrangements of monitoring devices; Arrangements of safety devices
    • F27D2021/0057Security or safety devices, e.g. for protection against heat, noise, pollution or too much duress; Ergonomic aspects
    • F27D2021/0071Security or safety devices, e.g. for protection against heat, noise, pollution or too much duress; Ergonomic aspects against explosions

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Toxicology (AREA)
  • Public Health (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention discloses the control methods for the safety system for preventing liquefied ammonia from spreading; reach alarming value when there is one or more to measure freezing unit workshop concentration of toxic gases in the ammonia detector (5), then ammonia detector control cabinet exports alarm signal to DCS system and electric control loop;The DCS system is interlocked by software, electric control loop by hardware realization, issues starting order to ventilation blower (4) and spray switch ball valve (7).By adopting the above technical scheme, it can be when there is liquefied ammonia or ammonia leakage in a closed environment in cryotherapy with liquid nitrogen machine and its pipeline, ventilation blower is interlocked firmly by ammonia detector alarm signal in ammonia refrigerator room, sprinkling equipment carries out automatic ventilation spray, indoor ammonia level and weak ammonia are reduced, guarantees the safety and reliability of refrigerator room ammonia system;And reliability is improved by software interlock, guarantee is provided to the subsequent maintenance of maintenance personal, personnel easy to repair enter investigation.

Description

The control method for the safety system for preventing liquefied ammonia from spreading
Technical field
The invention belongs to the technical fields of the flue gas treating process equipment in manufacture of cement.More particularly it relates to A kind of control method for the safety system for preventing liquefied ammonia from spreading.
Background technique
The process units of carbon dioxide in recycling cement kiln flue gas controls China and is slowed down electric power and water CO in mud production2Discharge is of great significance, and in " Paris agreement ", China promises to undertake the CO2 emission before the year two thousand thirty Reach peak value.Therefore, the saving of Yao Jiaqiang energy resources and ecological environmental protection enhance the capability of sustainable development, exploitation and popularization Save, substitute, recycling advanced and applicable technology with pollution administration, increasing energy conservation and environmental protection investment, emphasis reinforce water, atmosphere, The prevention and cure of pollution such as soil improve town and country living environment.Under existing science and technology and economic condition, the daily life of the mankind, Production also be unable to do without the use of fossil fuel, and can not also change this situation within considerable time;In energy knot In the case that structure is also difficult to happen radical change, CO2Separation and recovery control global CO using can yet be regarded as2Total emission volumn it is effective One of method.
Liquid ammonia is as refrigerant main in carbon dioxide capture system, according to " national security supervises general bureau about public affairs The notice of the hazardous chemical register of the first batch of emphasis supervision of cloth " (safety supervision general pipeline tri- (2011) 95), " national security supervision general bureau About the notice for announcing second batch emphasis supervision hazardous chemical register " (safety supervision general pipeline tri- (2013) 12) identification, project relates to And refrigerant liquefied ammonia belong to emphasis supervision hazardous chemical.
However, the carbon dioxide capture system refrigerator room ammonia system of manufacture of cement in the prior art but exist it is serious Security risk lacks monitoring if liquefied ammonia, ammonia leakage, will cause great hidden danger without discovery in time.
Summary of the invention
The present invention provides a kind of safety system for preventing liquefied ammonia from spreading, and the purpose is to improve refrigerator room ammonia system Safety and reliability.
To achieve the goals above, the technical scheme adopted by the invention is as follows:
The safety system for preventing liquefied ammonia from spreading of the invention, applied to returning for the carbon dioxide in cement kiln flue gas Receiving apparatus, the recyclable device include compressor, evaporative condenser;Refrigerator room is arranged in the safety system, The compressor, evaporative condenser are arranged in refrigerator room;The multiple ammonia detectors of setting in the refrigerator room.
Sprinkling equipment is set in the refrigerator room, the evaporative condenser is sprayed;The spray The DCS system that the control unit of equipment passes through the recyclable device of the carbon dioxide in signal line and the cement kiln flue gas Connection.
The sprinkling equipment includes spray waterpipe;Spray switch ball valve is set on the spray waterpipe;It is spraying Multiple spray heads are also set up on water pipe.
Multiple spray heads are equally distributed at the 500mm of evaporative condenser over top.
The safety system is equipped with ammonia detector control cabinet;The spray switch ball valve uses dedicated electricity Air circuit is controlled;When ammonia level is exceeded, the ammonia detector control cabinet outputs signal to ball valve electric loop, Automatically turn on spray switch ball valve.
Air duct is set in the refrigerator room, is equipped with ventilation blower in the air duct;The control list of the ventilation blower Member is connect by signal line with the DCS system of the recyclable device of the carbon dioxide in the cement kiln flue gas.
The safety system be equipped with ammonia detector control cabinet, the ammonia detector by signal line with The ammonia detector control cabinet connection;The ammonia detector control cabinet passes through signal line and the cement kiln cigarette The DCS system of the recyclable device of carbon dioxide in road gas connects.
The ammonia detector control cabinet is arranged in someone's Central Control Room on duty, and whistle and flash of light letter are issued when alarm Number.
The quantity of the ammonia detector is 5, is arranged in: the both ends of the evaporative condenser each one It is a;Each one of the both ends of the compressor;One between the evaporative condenser and compressor.
In order to realize goal of the invention identical with above-mentioned technical proposal, liquefied ammonia is prevented the present invention also provides above-described The control method of the safety system of diffusion, technical solution are:
Reach alarm when there is one or more to measure freezing unit workshop concentration of toxic gases in the ammonia detector Value, then ammonia detector control cabinet exports alarm signal to DCS system and electric control loop;
The DCS system is interlocked by software, electric control loop by hardware realization, to ventilation blower and spray switch Ball valve issues starting order.
The present invention by adopting the above technical scheme, can cryotherapy with liquid nitrogen machine and its pipeline occur in a closed environment liquefied ammonia or When ammonia leakage, ventilation blower, sprinkling equipment are interlocked by ammonia detector alarm signal in ammonia refrigerator room firmly and led to automatically Wind spray reduces indoor ammonia level and weak ammonia, guarantees the safety and reliability of refrigerator room ammonia system;And pass through Software interlock improves reliability, provides guarantee to the subsequent maintenance of maintenance personal, personnel easy to repair enter investigation.
Detailed description of the invention
Content shown in attached drawing and figure acceptance of the bid are denoted as being briefly described as follows:
Fig. 1 is the plan view of equipment in refrigerator room of the invention;
Fig. 2 is the fan motor electric control theory figure in the present invention;
Fig. 3 is the pneumatic on-off valve electric control theory figure in the present invention;
Fig. 4 is ventilation blower, spray ball valve interlocked control figure in the present invention.
In the figure, it is marked as
1, refrigerator room, 2, compressor, 3, evaporative condenser, 4, ventilation blower, 5, ammonia detector, 6, spray waterpipe, 7, spray switch ball valve, 8, spray head.
Specific embodiment
Below against attached drawing, by the description of the embodiment, making to a specific embodiment of the invention further details of Illustrate, to help those skilled in the art to have more complete, accurate and deep reason to inventive concept of the invention, technical solution Solution.
Structure of the invention as shown in Figure 1 is applied to cement kiln cigarette for a kind of safety system for preventing liquefied ammonia from spreading The recyclable device of carbon dioxide in road gas, the recyclable device include compressor 2, evaporative condenser 3.Make in the present invention The liquid ammonia of co 2 liquefaction cooling is provided by refrigeration system.Refrigeration system uses compressor 2, and structure is screw Ammonia compressor.
Gaseous ammonia, which enters in screw compressor, to be compressed, and into evaporative condenser 3, is condensed into liquid ammonia, storage In the reservoir.
The invention belongs to cement plant cement kiln flue gas CO2Purifying project is trapped, for the ventilation for the use for preventing liquefied ammonia from spreading Spray safety measure.This safety measure of the present invention can reduce caused by A leak of liquefied ammonia to producers and ring Border harm, in collecting carbonic anhydride project have it is initiative, have the meaning of biggish popularization and application in secure context.
Exist to overcome the problems, such as defect of the existing technology and solve it, realizes and improve refrigerator room ammonia system Safety and reliability goal of the invention, the technical scheme adopted by the invention is as follows:
As shown in Figure 1, the safety system setting refrigerator room 1 for preventing liquefied ammonia from spreading of the invention, the compression Machine 2, evaporative condenser 3 are arranged in refrigerator room 1;The multiple ammonia detectors 5 of setting in the refrigerator room 1.
Ammonia refrigerator room 1 of the invention is an enclosure space.
It is an object of the invention to overcome the deficiencies in the prior art, it is conventional use software interlock it is possible that malfunction and Software fault is based on existing enterprise's cement kiln flue gas CO2Trapping purifying (CCS) demonstrative project actual demand, in conjunction in the industry Various interlock requirements, ammonia refrigerator room 1 by 5 alarm signal of ammonia detector interlock firmly ventilation blower, sprinkling equipment carry out Automatic ventilation spray reduces indoor ammonia level and weak ammonia, guarantees the safety and reliability of refrigerator room ammonia system.
Above-described safety measure liquefied ammonia or ammonia can occur in cryotherapy with liquid nitrogen machine and its pipeline in a closed environment When leakage, effectively automatic ventilation spray is carried out, and is led to using 5 alarm signal of ammonia detector interlocking ventilation blower 4, sprinkling equipment It crosses software interlock and improves reliability, reduce indoor ammonia level and weak ammonia, the safety after improving ammonia system leakage is convenient for Maintenance personal enters investigation.
Sprinkling equipment is set in the refrigerator room 1, the evaporative condenser 3 is sprayed;The spray The control unit for drenching equipment passes through the DCS system of signal line and the recyclable device of the carbon dioxide in the cement kiln flue gas System connection.
The sprinkling equipment includes spray waterpipe 6;Spray switch ball valve 7 is set on the spray waterpipe 6;It is spraying Multiple spray heads 8 are also set up on spray pipe 6.
Multiple spray heads 8 are equally distributed at the 500mm of 3 over top of evaporative condenser.
The safety system is equipped with ammonia detector control cabinet;The spray switch ball valve 7 is using dedicated Electric loop is controlled;When ammonia level is exceeded, the ammonia detector control cabinet outputs signal to ball valve and electrically returns Road automatically turns on spray switch ball valve 7.
The present invention increase sprinkling equipment, above ammonia condensing module increase by five spray heads 8, by spray switch ball valve 7 come Control the start-stop of spray nozzle 8;Spray switch ball valve 7 is controlled using dedicated electric loop, as shown in Figure 3.
The present invention increases ammonia controlling alarm case K3 opened point newly, when ammonia detector 5 issues alarm signal, passes through alarm K3 inside device, which is obtained, electric starts spray switch ball valve 7;After start completion by scene confirmation it is errorless after, scene stop spray switch Ball valve 7.
When ammonia level is exceeded, ammonia detector control cabinet outputs signal to ball valve electric loop, automatically turns on spray and opens Close ball valve 7.
Air duct is set in the refrigerator room 1, is equipped with ventilation blower 4 in the air duct;The control of the ventilation blower 4 Unit is connect by signal line with the DCS system of the recyclable device of the carbon dioxide in the cement kiln flue gas.
It is as shown in Figure 2:
Ventilation blower 4 is controlled using dedicated electric loop, when ammonia level is exceeded, the output of ammonia detector control cabinet Signal automatically turns on ventilation blower 4 to ventilation blower electric loop.
When liquefied ammonia or ammonia leakage occur in refrigerator room 1 in cryotherapy with liquid nitrogen machine and its pipeline, by ammonia in refrigerator room Detector 5 monitors that ammonia level is exceeded, issues signal to ammonia detector control cabinet, is exported by ammonia detector control cabinet Node signal by control cable be respectively connected to ventilation blower 4 and spray pneumatic operated valve electric loop in, automatically turn on ventilation blower 4 and Sprinkling equipment.
Meanwhile detector control cabinet exports alarm signal to DCS system, opens ventilation blower 4 and spray by DCS software interlock Pneumatic operated valve realizes the dual fail-safe of software and hardware.
The safety system is equipped with ammonia detector control cabinet, is used for output signal, the ammonia detector 5 It is connect by signal line with the ammonia detector control cabinet;The ammonia detector control cabinet by signal line with The DCS system of the recyclable device of carbon dioxide in the cement kiln flue gas connects.
The present invention increases ammonia controlling alarm case K2 opened point newly, when ammonia detector 5 issues alarm signal, passes through alarm K2 inside device, which is obtained, electric starts ventilation blower 4;After start completion by scene confirmation it is errorless after, scene stop blower work.
The ammonia detector control cabinet is arranged in someone's Central Control Room on duty, and whistle and flash of light letter are issued when alarm Number.
Software control is carried out using DCS system, it is intelligent in the AI/AO card selection of device DCS system, with site intelligent instrument Table communication, realizes AMS equipment management on DCS;To the online configuration of the carry out such as field intelligent instrument, debugging, verification management, diagnosis And Database Events record.
Whole device DCS system touches block for CPU, power supply, communication, process control network considers dual;When ammonia contains When measuring exceeded, ammonia detector control cabinet exports alarm signal to DCS system, and software interlock opens ventilation blower and sprinkling equipment.
The quantity of the ammonia detector 5 is 5, is arranged in: the both ends each one of the evaporative condenser 3 It is a;Each one of the both ends of the compressor 2;One between the evaporative condenser 3 and compressor 2.
As shown in Figure 1, the different location in refrigerator room 1, five ammonia detectors 5 are arranged in different height.Its code name point It Wei not AT-0501~0505.
In order to realize goal of the invention identical with above-mentioned technical proposal, liquefied ammonia is prevented the present invention also provides above-described The control method of the safety system of diffusion, technical solution are:
It is as shown in Figure 4:
Reach alarm when there is one or more to measure freezing unit workshop concentration of toxic gases in the ammonia detector 5 Value, then ammonia detector control cabinet exports alarm signal to DCS system and electric control loop;
The DCS system is interlocked by software, electric control loop by hardware realization, is opened to ventilation blower 4 and spray It closes ball valve 7 and issues starting order.
The alarming value is 85ppm.
After implementation through the invention, cement kiln flue gas CO ensure that2The security reliability of purifying project ammonia system is trapped, By air draft, spray in the case where refrigerator room NH_3 leakage, the concentration of interior ammonia level and weak ammonia is reduced, to maintenance The subsequent maintenance of personnel provides safety guarantee.
The present invention is exemplarily described above in conjunction with attached drawing, it is clear that the present invention implements not by aforesaid way Limitation, as long as the improvement for the various unsubstantialities that the inventive concept and technical scheme of the present invention carry out is used, or without changing It is within the scope of the present invention into the conception and technical scheme of the invention are directly applied to other occasions.

Claims (1)

1. the control method for the safety system for preventing liquefied ammonia from spreading, applied to returning for the carbon dioxide in cement kiln flue gas Receiving apparatus, the recyclable device include compressor (2), evaporative condenser (3);Freezing is arranged in the safety system Computer room (1), the compressor (2), evaporative condenser (3) setting are in refrigerator room (1);The refrigerator room (1) The interior multiple ammonia detectors (5) of setting;
Sprinkling equipment is set in the refrigerator room (1), the evaporative condenser (3) is sprayed;The spray The control unit for drenching equipment passes through the DCS system of signal line and the recyclable device of the carbon dioxide in the cement kiln flue gas System connection;
The sprinkling equipment includes spray waterpipe (6);Spray switch ball valve (7) are set on the spray waterpipe (6);? Multiple spray heads (8) are also set up on spray waterpipe (6);
Multiple spray heads (8) are equally distributed at the 500mm of evaporative condenser (3) over top;
The safety system is equipped with ammonia detector control cabinet;The spray switch ball valve (7) uses dedicated electricity Air circuit is controlled;When ammonia level is exceeded, the ammonia detector control cabinet outputs signal to ball valve electric loop, It automatically turns on spray switch ball valve (7);
Air duct is set in the refrigerator room (1), is equipped with ventilation blower (4) in the air duct;The control of the ventilation blower (4) Unit processed is connect by signal line with the DCS system of the recyclable device of the carbon dioxide in the cement kiln flue gas;
The safety system be equipped with ammonia detector control cabinet, the ammonia detector (5) by signal line with The ammonia detector control cabinet connection;The ammonia detector control cabinet passes through signal line and the cement kiln cigarette The DCS system of the recyclable device of carbon dioxide in road gas connects;
The ammonia detector control cabinet is arranged in someone's Central Control Room on duty, and whistle and flashing signal are issued when alarm;
The quantity of the ammonia detector (5) is 5, is arranged in: the both ends each one of the evaporative condenser (3) It is a;Each one of the both ends of the compressor (2);One between the evaporative condenser (3) and compressor (2);
It is characterized by:
Reach alarm when there is one or more to measure freezing unit workshop concentration of toxic gases in the ammonia detector (5) Value, then ammonia detector control cabinet exports alarm signal to DCS system and electric control loop;
The DCS system is interlocked by software, electric control loop by hardware realization, to ventilation blower (4) and spray switch Ball valve (7) issues starting order.
CN201811549401.7A 2018-12-18 2018-12-18 The control method for the safety system for preventing liquefied ammonia from spreading Pending CN109539810A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811549401.7A CN109539810A (en) 2018-12-18 2018-12-18 The control method for the safety system for preventing liquefied ammonia from spreading

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811549401.7A CN109539810A (en) 2018-12-18 2018-12-18 The control method for the safety system for preventing liquefied ammonia from spreading

Publications (1)

Publication Number Publication Date
CN109539810A true CN109539810A (en) 2019-03-29

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Country Status (1)

Country Link
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103557623A (en) * 2013-11-14 2014-02-05 赵强 Ammonia machine refrigeration ternary-circulation device
CN204902348U (en) * 2015-07-09 2015-12-23 福建省燕京惠泉啤酒股份有限公司 Refrigeration station ammonia leaks emergent electrical control device of reporting to police
CN207035597U (en) * 2017-07-12 2018-02-23 广州麦芽有限公司 Safety and energy-saving ammonia refrigeration system
CN207960945U (en) * 2017-12-29 2018-10-12 安徽六国化工股份有限公司 A kind of NH_3 leakage automatic control protecting device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103557623A (en) * 2013-11-14 2014-02-05 赵强 Ammonia machine refrigeration ternary-circulation device
CN204902348U (en) * 2015-07-09 2015-12-23 福建省燕京惠泉啤酒股份有限公司 Refrigeration station ammonia leaks emergent electrical control device of reporting to police
CN207035597U (en) * 2017-07-12 2018-02-23 广州麦芽有限公司 Safety and energy-saving ammonia refrigeration system
CN207960945U (en) * 2017-12-29 2018-10-12 安徽六国化工股份有限公司 A kind of NH_3 leakage automatic control protecting device

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Application publication date: 20190329

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