CN110208321A - A kind of combustible gas explosion limit analysis system - Google Patents

A kind of combustible gas explosion limit analysis system Download PDF

Info

Publication number
CN110208321A
CN110208321A CN201910597769.9A CN201910597769A CN110208321A CN 110208321 A CN110208321 A CN 110208321A CN 201910597769 A CN201910597769 A CN 201910597769A CN 110208321 A CN110208321 A CN 110208321A
Authority
CN
China
Prior art keywords
gas
combustion
negative
sample
pressure
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
CN201910597769.9A
Other languages
Chinese (zh)
Inventor
杨国强
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.)
Shanghai Zhiang Environmental Protection Technology Co Ltd
Original Assignee
Shanghai Zhiang Environmental Protection Technology 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 Shanghai Zhiang Environmental Protection Technology Co Ltd filed Critical Shanghai Zhiang Environmental Protection Technology Co Ltd
Priority to CN201910597769.9A priority Critical patent/CN110208321A/en
Publication of CN110208321A publication Critical patent/CN110208321A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00Investigating or analyzing materials by the use of thermal means
    • G01N25/20Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
    • G01N25/22Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures
    • G01N25/28Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures the rise in temperature of the gases resulting from combustion being measured directly

Abstract

The invention discloses a kind of combustible gas explosion limit analysis systems, including combustion gas transportation system, combustion reaction system, sample gas transportation system, the reaction induction system of heat in combustion reaction system can be detected, range gas transportation system and compressed gas negative-pressure sucking extraction system, the combustion gas transportation system and sample gas transportation system are connect with combustion reaction system respectively, and reaction induction system is provided in combustion reaction system, the compressed gas negative-pressure sucking extraction system is connected between combustion gas transportation system and combustion reaction system, and range gas transportation system is connected to, between sample gas transportation system and combustion reaction system, here pass through burning, inorganic fuel gas and organic combustible gas can be measured, and the content of oxygen, it is more complete.

Description

A kind of combustible gas explosion limit analysis system
Technical field
The present invention relates to combustible gas explosion limit analysis technical field, specially a kind of combustible gas explosion limit analysis System.
Background technique
A large amount of organic and inorganic combustible gases are generated during industrial production (medication chemistry, packages printing, surface spraying etc.) How body ensures fuel gas safe transport and utilization, prevents fire and explosion danger accident from occurring, increasingly by country and Enterprises and institutions' concern and attention.With environmental requirement and the raising of supervision, to the standard and essence of the monitoring of gas concentration Exactness is also higher and higher.Especially in recent years, the industries waste gas emission standard such as medication chemistry, packages printing, surface spraying mentions Out, how to ensure that concentration guarantees below Flammability limits value, it is ensured that the conveying of exhaust gas safety compliance and utilization are more next in production process More further is paid attention to and paid close attention to.
Usual fuel gas needs certain safety margin, is generally indicated with the percentage of lower explosion limit LEL, such as 20% LEL.For oxygen, it is ensured that in a safe range, under limit oxygen concentration, explode without enough oxygen, such as There are 3-4% oxygen, safe explosion danger also be can avoid.Meanwhile country has formulated Specification, further ensures that monitoring The healthy and orderly development of technology, for example national standard specification " continuously supervise by HJ 1013-2018 stationary source exhaust gas non-methane total hydrocarbons Examining system technical requirements and detection method " series that defines non-methane total hydrocarbons continuous monitor system in stationary source exhaust gas wants It asks.
The quick LEL monitoring instrument of industrial process fuel gas measurement analysis is usual are as follows: catalysis burning, infrared absorption analysis Instrument or flame ionisation detector FID testing principle limit to obvious, wherein Analysis of Defects to application environmental working condition It is as follows:
Although catalysis burning is temperature methods, reaction speed is slow, is easy failure and catalyst poisoning, maintenance is big, Wrong report and failure risk height etc.;
Although infrared absorption analysis principle is relatively stable, NDIR is infrared, and there are spectral wavelength coverings, and to being mixed with The response of machine object is uncertain, and the response time, to the requirement of measurement gas temperature and dual symmetry gas, inorganic gas is without sound The problems such as answering etc.;
FID is one of analysis most commonly used method of hydrocarbon, passes through hydrocarbon combustion shape in measurement flame At ionic current.Although principle is relatively stable quick, there is to inorganic gas the problems such as without response.
For this reason, it may be necessary to which one kind can measure organic gas and inorganic gas, and the system of measurement oxygen content.
Summary of the invention
The purpose of the present invention is to provide a kind of combustible gas explosion limit analysis systems, to solve in above-mentioned background technique The problem of proposition.
To achieve the above object, the invention provides the following technical scheme: a kind of combustible gas explosion limit analysis system, packet Include combustion gas transportation system, combustion reaction system, sample gas transportation system, the reaction sense that heat in combustion reaction system can be detected System, range gas transportation system and compressed gas negative-pressure sucking extraction system are answered, the combustion gas transportation system and sample gas are defeated It send system to connect respectively with combustion reaction system, and is provided with reaction induction system in combustion reaction system, the compressed gas is negative Pressure suction extraction system be connected between combustion gas transportation system and combustion reaction system, and range gas transportation system be connected to, Between sample gas transportation system and combustion reaction system;
The combustion reaction system includes flame unit assembly, and the flame unit assembly includes the chamber for accommodating combustion test Room shape flame unit, and burner platform is provided in flame unit, the spark plug of igniting is provided on the burner platform;
The combustion gas transportation system includes the burning letter shoot connecting with flame unit and to be connected to combustion gas defeated Send the combustion gas pressure-control valve and combustion-gas flow meter on pipe;
The compressed gas negative-pressure sucking extraction system include negative inspiratory pressure device, the negative tube being connect with negative inspiratory pressure device and The negative pressure pressure valve and negative pressure flowmeter being connected on negative tube, and the end of negative tube is connected to burning letter shoot close to fire On one end of flame unit;
The sample gas transportation system includes the sample gas appendix connecting with flame unit, and sample gas appendix and negative Sample gas meter is provided between pressure pipe;
The range gas transportation system includes the range tracheae connecting with sample gas appendix and is connected to range tracheae On range atmospheric pressure valve and range air-flow meter;
The end of the flame unit is connected with exhaust pipe, and the end of exhaust pipe is connected on negative inspiratory pressure device.
Preferably, the reaction induction system includes flame detector, can be electric signal by the converting heat of burning generation Temperature detector and the analog-digital converter that is connect with temperature detector, the analog-digital converter be connected with microprocessor, and Microprocessor connection can show that the configuration of under test gas content is shown.
Preferably, it is provided with exhaust fire arrester between the exhaust pipe and flame unit, and is provided with exhaust on exhaust pipe Flowmeter.
It preferably, further include the pressure sensor being arranged on sample exhaust pipe, and pressure sensor is electrically connected micro process Device, the microprocessor are connected with police instruction.
Preferably, the police instruction is warning lamp and buzzer.
Preferably, the gas that the burning letter shoot is passed through is one kind of hydrogen and person's propane.
Preferably, exhaust fire arrester is provided between the flame unit and exhaust pipe, and flame unit and sample gas are defeated Sample gas fire arrester is provided between tracheae.
Preferably, discharge filter and sample air filter are respectively arranged on the exhaust pipe and sample gas appendix.
Preferably, the exhaust flow-meter, range air-flow meter, negative pressure flowmeter and sample gas meter are orifice plate stream Meter.
Compared with prior art, the beneficial effects of the present invention are:
1, by sample gas appendix, input sample is entered in flame unit, meanwhile, it is sent into through burning letter shoot Fuel guarantees the oxygen completely burned in sample, by not being easily ignited by the spark plug on burner platform, burns, then temperature The heat generated when degree detector detection burning, is transformed into electric signal through analog-digital converter, is transmitted to microprocessor, then micro process Device is transmitted to configuration and shows, shows oxygen content;
2, similar with oxygen determination gas likewise, when measuring fuel gas content, only, it is not passed through combustible fuel gas, but It is passed through the air of compression by negative tube, oxygen is provided, carries out full combustion, in conjunction with sample gas meter and negative pressure flowmeter Flow is calculated through microprocessor, through Dynamically Announce, shows the content of fuel gas;
Here the content of inorganic fuel gas and organic combustible gas and oxygen can be measured, more entirely.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention;
Fig. 2 is circuit theory schematic diagram of the invention.
In figure: 1 negative inspiratory pressure device, 2 exhaust flow-meters, 3 pressure sensors, 4 exhaust fire arresters, 5 exhaust fire arresters, 6 combustions Burner plate, 7 flame unit assemblies, 8 flame units, 9 sample gas fire arresters, 10 combustion-gas flow meters, 11 burning atmospheric pressure controls Valve, 12 burning letter shoots, 13 range air-flow meters, 14 range tracheaes, 15 negative pressure flowmeters, 16 negative pressure pressure valve, 17 negative pressure Pipe, 18 range atmospheric pressure valves, 19 sample air filters, 20 sample gas meters, 21 sample gas appendixs, 22 exhaust pipes.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
Fig. 1 to 2 is please referred to, the present invention provides a kind of technical solution: a kind of combustible gas explosion limit analysis system, including Combustion gas transportation system, combustion reaction system, sample gas transportation system, the reaction induction that heat in combustion reaction system can be detected System, range gas transportation system and compressed gas negative-pressure sucking extraction system, combustion gas transportation system and sample gas transportation system It is connect respectively with combustion reaction system, and is provided with reaction induction system in combustion reaction system, compressed gas negative-pressure sucking extracts System is connected between combustion gas transportation system and combustion reaction system, and range gas transportation system is connected to, sample gas conveying Between system and combustion reaction system.
Combustion reaction system includes flame unit assembly 7, and flame unit assembly 7 includes the chamber shape fire for accommodating combustion test Flame unit 8, and burner platform 6 is provided in flame unit 8, the spark plug of igniting is provided on burner platform 6.
Combustion gas transportation system include the burning letter shoot 12 being connect with flame unit 8 and be connected to combustion gas conveying Combustion gas pressure-control valve 11 and combustion-gas flow meter 10 on pipe 12.
Compressed gas negative-pressure sucking extraction system include negative inspiratory pressure device 1, the negative tube being connect with negative inspiratory pressure device 1 17 and The negative pressure pressure valve 16 and negative pressure flowmeter 15 being connected on negative tube 17, and the end of negative tube 17 is connected to combustion gas conveying Pipe 12 is on one end of flame unit 8.
Sample gas transportation system includes the sample gas appendix 21 connecting with flame unit 8, and sample gas appendix 21 with Sample gas meter 20 is provided between negative tube 17.
Range gas transportation system includes the range tracheae 14 connecting with sample gas appendix 21 and is connected to range tracheae Range atmospheric pressure valve 18 and range air-flow meter 13 on 14.
The end of flame unit 8 is connected with exhaust pipe 22, and the end of exhaust pipe 22 is connected on negative inspiratory pressure device 1, row It is provided with exhaust fire arrester 5 between tracheae 22 and flame unit 8, and is provided with exhaust flow-meter 2 on exhaust pipe 22, measurement exhaust Flow further includes the pressure sensor 3 being arranged on sample exhaust pipe 22, and pressure sensor 3 is electrically connected microprocessor, micro- place Reason device is connected with police instruction, once gas circulation is unsmooth, just will call the police, and reminds staff's maintenance, and police instruction is warning Lamp and buzzer can be seen in this way, can also hear, the gas that burning letter shoot 12 is passed through is the one of hydrogen and person's propane Kind, it can burn with oxygen association reaction, flame is avoided to flow out, guarantee that measurement is accurate, exhaust pipe 22 and sample gas appendix It is respectively arranged with discharge filter 4 and sample air filter 19 on 21, impurity is avoided to enter, exhaust flow-meter 2, range throughput Meter 13, negative pressure flowmeter 15 and sample gas meter 20 are orifice flowmeter, more accurately.
Reaction induction system includes flame detector, the temperature detector that the converting heat that can generate burning is electric signal And the analog-digital converter being connect with temperature detector, analog-digital converter is connected with microprocessor, and microprocessor connection can The configuration of display under test gas content is shown, shows the content of fuel gas, the heat generated by burning, and the sample being passed through The amount of product gas and fuel gas is calculated, when what is be passed through is fuel gas, be in order to consume the intracorporal oxygen of sample gas gas, Estimate oxygen content, and when what is be passed through is the oxygen of negative tube 17, be exactly in order to by sample organic gas and it is inorganic can Fire full combustion of gas.
Working principle: by sample gas appendix 21, input sample is entered in flame unit 8, meanwhile, through combustion gas Delivery pipe 12 is sent into fuel, guarantees the oxygen completely burned in sample, by not being easily ignited by the spark plug on burner platform 6, into Row burning, the heat then generated when temperature detector detection burning, is transformed into electric signal through analog-digital converter, is transmitted to micro process Device, then microprocessor is transmitted to configuration and shows, shows oxygen content, likewise, when measurement fuel gas content, with oxygen determination gas class Seemingly, only, it is not passed through combustible fuel gas, but is passed through the air of compression by negative tube 17, oxygen is provided, is sufficiently fired It burns, is calculated in conjunction with the flow of sample gas meter 22 and negative pressure flowmeter 15 through microprocessor, through Dynamically Announce, display The content of fuel gas.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding And modification, the scope of the present invention is defined by the appended.

Claims (9)

1. a kind of combustible gas explosion limit analysis system, it is characterised in that: including combustion gas transportation system, combustion reaction system System, sample gas transportation system, the reaction induction system that heat in combustion reaction system can be detected, range gas transportation system and pressure Contracting gas negative-pressure sucking extraction system, the combustion gas transportation system and sample gas transportation system connect with combustion reaction system respectively It connects, and is provided with reaction induction system in combustion reaction system, the compressed gas negative-pressure sucking extraction system is connected to combustion gas Between transportation system and combustion reaction system, and range gas transportation system is connected to, sample gas transportation system and combustion reaction system Between system;
The combustion reaction system includes flame unit assembly (7), and the flame unit assembly (7) includes accommodating combustion test Chamber shape flame unit (8), and be provided with burner platform (6) in flame unit (8), it is arranged a little on the burner platform (6) The spark plug of fire;
The combustion gas transportation system includes the burning letter shoot (12) connecting with flame unit (8) and is connected to combustion gas Combustion gas pressure-control valve (11) and combustion-gas flow meter (10) in delivery pipe (12);
The negative tube that the compressed gas negative-pressure sucking extraction system includes negative inspiratory pressure device (1), is connect with negative inspiratory pressure device (1) , and the end of negative tube (17) (17) and the negative pressure pressure valve (16) and negative pressure flowmeter (15) that are connected on negative tube (17) Burning letter shoot (12) is connected on the one end of flame unit (8);
The sample gas transportation system includes the sample gas appendix (21) connecting with flame unit (8), and sample gas appendix (21) it is provided between negative tube (17) sample gas meter (20);
The range gas transportation system includes the range tracheae (14) connecting with sample gas appendix (21) and is connected to range Range atmospheric pressure valve (18) and range air-flow meter (13) on tracheae (14);
The end of the flame unit (8) is connected with exhaust pipe (22), and the end of exhaust pipe (22) is connected to negative inspiratory pressure device (1) on.
2. a kind of combustible gas explosion limit analysis system according to claim 1, it is characterised in that: the reaction induction System includes flame detector, temperature detector and and temperature detector that the converting heat that can generate burning is electric signal The analog-digital converter of connection, the analog-digital converter is connected with microprocessor, and microprocessor connection can show under test gas The configuration of content is shown.
3. a kind of combustible gas explosion limit analysis system according to claim 2, it is characterised in that: the exhaust pipe (22) it is provided with exhaust fire arrester (5) between flame unit (8), and is provided with exhaust flow-meter (2) on exhaust pipe (22).
4. a kind of combustible gas explosion limit analysis system according to claim 3, it is characterised in that: further include that setting exists Pressure sensor (3) on sample exhaust pipe (22), and pressure sensor (3) is electrically connected microprocessor, the microprocessor connects It is connected to police instruction.
5. a kind of combustible gas explosion limit analysis system according to claim 4, it is characterised in that: the police instruction For warning lamp and buzzer.
6. a kind of combustible gas explosion limit analysis system according to claim 1, it is characterised in that: the combustion gas is defeated Sending the pipe gas that (12) are passed through is one kind of hydrogen and person's propane.
7. a kind of combustible gas explosion limit analysis system according to claim 5, it is characterised in that: the flame unit (8) it is provided with exhaust fire arrester (5) between exhaust pipe (22), and is set between flame unit (8) and sample gas appendix (21) It is equipped with sample gas fire arrester (9).
8. a kind of combustible gas explosion limit analysis system according to claim 7, it is characterised in that: the exhaust pipe (22) and on sample gas appendix (21) discharge filter (4) and sample air filter (19) are respectively arranged with.
9. a kind of combustible gas explosion limit analysis system according to claim 8, it is characterised in that: the extraction flow Counting (2), range air-flow meter (13), negative pressure flowmeter (15) and sample gas meter (20) is orifice flowmeter.
CN201910597769.9A 2019-07-04 2019-07-04 A kind of combustible gas explosion limit analysis system Pending CN110208321A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910597769.9A CN110208321A (en) 2019-07-04 2019-07-04 A kind of combustible gas explosion limit analysis system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910597769.9A CN110208321A (en) 2019-07-04 2019-07-04 A kind of combustible gas explosion limit analysis system

Publications (1)

Publication Number Publication Date
CN110208321A true CN110208321A (en) 2019-09-06

Family

ID=67796141

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910597769.9A Pending CN110208321A (en) 2019-07-04 2019-07-04 A kind of combustible gas explosion limit analysis system

Country Status (1)

Country Link
CN (1) CN110208321A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111366609A (en) * 2020-03-15 2020-07-03 莱浦顿(上海)工程技术有限公司 Combustible gas analyzer
CN111766330A (en) * 2020-06-30 2020-10-13 南京三鸣智自动化工程有限公司 Gas detection device and detection method

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060234387A1 (en) * 2002-06-27 2006-10-19 Schaeffer Christopher G Gas analyzer for measuring the flammability of mixtures of combustible gases and oxygen
CN101906993A (en) * 2010-08-26 2010-12-08 周泉清 Method and device for early warning explosion of gas and other combustible gases
CN201983961U (en) * 2011-03-25 2011-09-21 昆明醋酸纤维有限公司 Negative pressure sampling analytical system for gas analyzer
CN203941102U (en) * 2014-03-25 2014-11-12 南京霍普斯科技有限公司 A kind of solid waste incineration is processed on-line analysis system
CN106168591A (en) * 2016-08-22 2016-11-30 苏州工业园区姑苏科技有限公司 Combustible gas detecting device in a kind of stove
CN107064406A (en) * 2017-04-14 2017-08-18 中国石油化工股份有限公司 Online total hydrocarbon concentration alarming method by monitoring
CN207964721U (en) * 2018-01-11 2018-10-12 北京泰时康达科技有限公司 Carbohydrate content analysis system
CN210294133U (en) * 2019-07-04 2020-04-10 上海智昂环保科技有限公司 Combustible gas explosion limit analysis system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060234387A1 (en) * 2002-06-27 2006-10-19 Schaeffer Christopher G Gas analyzer for measuring the flammability of mixtures of combustible gases and oxygen
CN101906993A (en) * 2010-08-26 2010-12-08 周泉清 Method and device for early warning explosion of gas and other combustible gases
CN201983961U (en) * 2011-03-25 2011-09-21 昆明醋酸纤维有限公司 Negative pressure sampling analytical system for gas analyzer
CN203941102U (en) * 2014-03-25 2014-11-12 南京霍普斯科技有限公司 A kind of solid waste incineration is processed on-line analysis system
CN106168591A (en) * 2016-08-22 2016-11-30 苏州工业园区姑苏科技有限公司 Combustible gas detecting device in a kind of stove
CN107064406A (en) * 2017-04-14 2017-08-18 中国石油化工股份有限公司 Online total hydrocarbon concentration alarming method by monitoring
CN207964721U (en) * 2018-01-11 2018-10-12 北京泰时康达科技有限公司 Carbohydrate content analysis system
CN210294133U (en) * 2019-07-04 2020-04-10 上海智昂环保科技有限公司 Combustible gas explosion limit analysis system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111366609A (en) * 2020-03-15 2020-07-03 莱浦顿(上海)工程技术有限公司 Combustible gas analyzer
CN111766330A (en) * 2020-06-30 2020-10-13 南京三鸣智自动化工程有限公司 Gas detection device and detection method
CN111766330B (en) * 2020-06-30 2022-04-19 南京三鸣智自动化工程有限公司 Gas detection device and detection method

Similar Documents

Publication Publication Date Title
CN110208321A (en) A kind of combustible gas explosion limit analysis system
CN104457852A (en) On-line monitoring system for greenhouse gas emission of fixed combustion source
CN209690223U (en) A kind of fixed combustible gas detector
CN104217518A (en) Intelligent fire alarm and operating method thereof
CN210294133U (en) Combustible gas explosion limit analysis system
BRPI1010448A2 (en) burner monitoring burner tower pilots
CN209485675U (en) A kind of fire arrester flow resistance coefficient test device
CN111157477A (en) Total hydrocarbon concentration detector and total hydrocarbon concentration detection method
CN106871139A (en) A kind of burned waste gas convey explosion-proof anti-backfire security system
CN106501452A (en) Integrated flue gas discharge hot test device with the burner of power curve test
CN113567613A (en) Device and method for testing combustion characteristics of material in low-pressure oxygen-enriched environment
CN209745930U (en) Flue gas hygrometer with drainage function
CN208847648U (en) Dangerous waste processing system with laser oxygen analyzer
CN208223756U (en) The detection device of micro-leakage gas
CN106168591B (en) Combustible gas detecting device in a kind of furnace
CN217604122U (en) Novel organic gas explosion-proof safety detection system
CN204241032U (en) A kind of stationary combustion source greenhouse gas emission on-line monitoring system
CN208155956U (en) Gas hazard attribute testing instrument
CN206057230U (en) Combustible gas detecting device in stove
CN203811371U (en) Natural gas line bleeding valve on-line testing device
CN215911005U (en) Quality testing device for gas alarm used before sale
CN110044836A (en) FUSION WITH MULTISENSOR DETECTION device towards toxic gas
CN214148787U (en) Safety protection device for combustion system of rotary kiln
CN210037597U (en) Multi-sensor detection device for toxic gas
CN217443286U (en) Gas detection device for dangerous chemical accidents

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination