Standards for the Installation of Temperature Sensors in Coal Mines:
“Regulations on the Management of Safety Monitoring Systems and Detection Instruments in Coal Mines (AQ1029-2019)”
7.7.1 Temperature sensors should be vertically suspended, no more than 300mm from the roof (top beam), and no less than 200mm from the wall, and should be easy to install and maintain without obstructing personnel and vehicles.
Standards for the Installation of Temperature Sensors in Coal Mines:
New “Coal Mine Safety Regulations”
Article 541In the gas extraction pump station, the suction pipeline must be equipped with flow, temperature and pressure sensors.For gas extraction pump stations in self-igniting and easily self-igniting coal seams, a carbon monoxide sensor should also be installed in the suction pipeline,with the alarm concentration determined by the chief engineer of the coal mine.
Return air lanes in coal mining working faces,return air flows in excavation working faces,and return air lanes in the mining area should be equipped with carbon monoxide and temperature sensors.The carbon monoxide alarm concentration should be greater than or equal to0.24％.The temperature alarm value is determined by the chief engineer of the coal mine.
In the wind entry lane, the head and tail rollers of the belt conveyor should have carbon monoxide~20m range should be equipped with carbon monoxide, temperature and smoke sensors.The carbon monoxide alarm concentration should be greater than or equal to0.1％.The temperature alarm value is determined by the chief engineer of the coal mine.
The charging chamber should be equipped with methane, hydrogen, carbon monoxide, smoke and temperature sensors.The methane alarm and power cut concentration should be greater than or equal to0.5％;The hydrogen alarm and power cut concentration should be greater than or equal to0.5％The carbon monoxide alarm and power cut concentration should be greater than or equal to 0.24％The temperature alarm value is determined by the chief engineer of the coal mine;The power cut range includes all non-intrinsically safe equipment power in the charging chamber.
Article 712
When the air temperature in the mining face exceeds26℃, and the temperature in the electromechanical equipment chamber exceeds30℃, the working time of personnel in the overheated area must be shortened,and high-temperature health care measures should be provided.
When the air temperature in the mining face exceeds30℃, and the temperature in the electromechanical equipment chamber exceeds34℃, work must be stopped.
When designing new or expanded mines,temperature prediction calculations must be conducted,and cooling facilities must be provided in overheated areas.
“Coal Mine Fire Prevention and Extinguishing Regulations”
Article 51
In mines that extract easily self-igniting and self-igniting coal seams, a natural fire monitoring system must be established, using continuous automatic or manual sampling methods to monitor changes in gas components such as methane, carbon monoxide, carbon dioxide, oxygen, ethylene, and acetylene, and temperature monitoring should be increased based on actual conditions.
Article 53
In mines that extract easily self-igniting and self-igniting coal seams, carbon monoxide sensors and temperature sensors should be installed. The installation of sensors should comply with the following provisions:
(1) At least one carbon monoxide sensor must be installed in the coal mining working face, which can be located in the return air corner, working face, or return air lane of the working face. A temperature sensor should be installed in the coal mining working face or return air lane of the working face.
(2) Return air lanes in the mining area, one wing return air lane, and the total return air lane should be equipped with carbon monoxide sensors, and temperature sensors should be installed as appropriate.
(5) Carbon monoxide sensors and temperature sensors should be vertically suspended, no more than 300mm from the roof (top beam), and no less than 200mm from the wall, and should be easy to install and maintain without obstructing personnel and vehicles.
Article 55
Belt conveyors must be equipped with anti-slip, deviation, coal pile, and tearing protection devices, and should also be equipped with temperature, smoke monitoring devices, and automatic sprinkler systems, and it is advisable to set up an automatic fire extinguishing system with real-time monitoring capabilities.
Smoke sensors should be installed 10 to 15m downwind of the drive roller of the belt conveyor, and carbon monoxide sensors should be installed as appropriate. For belt conveyors that use unloading rollers as drive rollers, smoke sensors should be installed directly above the roller.
Article 56
The electromechanical equipment chamber should be equipped with temperature sensors, and sufficient fire extinguishing equipment for electrical fires must be provided in the chamber.
Article 57
Air compressors should be equipped with temperature sensors, and when the temperature exceeds the limit, an automatic sound and light alarm should be triggered, and the power supply to the air compressor should be cut off.
Article 58
When extracting gas from easily self-igniting and self-igniting coal seams in mined-out areas, the extraction pipeline should be equipped with carbon monoxide, methane, and temperature sensors for real-time monitoring and control.
“Regulations on the Prevention of Coal and Gas Outbursts”
Article 47
For regional prediction, pre-extraction, and effect verification drilling, video monitoring and other means should be used to check and confirm the drilling depth, and a verification and analysis system should be established.
For pre-extraction gas drilling with a depth exceeding 120m, at least 2 trajectories should be measured for every 10 drill holes, and for depths of 60 to 120m, at least 1 trajectory should be measured for every 10 drill holes. For drilling holes where the actual coal exposure (stop) length exceeds one-third of the designed exposure (stop) length, the trajectory of that drill hole should be measured. When the control range of the drill hole is insufficient or there are blank areas, regional anti-outburst measures must be supplemented.
When pre-extracting gas from coal seams, the extraction time for each drill hole should be recorded, and the concentration and negative pressure of the drill holes should be measured regularly; automatic metering devices should be installed for each unit, and the concentration, negative pressure, flow, temperature, carbon monoxide, etc. of the pipeline gas should be monitored or detected separately according to the effectiveness of the measures, and the gas extraction amount of the automatic metering or statistical calculation unit. The data from the automatic metering or statistical calculation will serve as the basic data for verifying the effectiveness of the pre-extraction.
Regulations on the Management of Safety Monitoring Systems and Detection Instruments in Coal Mines (AQ1029-2019)
7.5 Installation of Other Sensors in Gas Extraction Pipelines
In the input pipeline of the gas extraction pump station, it is advisable to install flow sensors, temperature sensors, and pressure sensors; when utilizing gas, flow sensors, temperature sensors, and pressure sensors should be installed in the output pipeline. Safety devices for backfire should have differential pressure sensors installed.
7.7.2 In coal mining working faces where easily self-igniting, self-igniting coal seams and high ground temperatures are present, temperature sensors should be installed in the working face or return air lane. The alarm value for temperature sensors is 30 ℃
7.7.3 Temperature sensors should be installed in the electromechanical equipment chamber, with an alarm value of 34℃
7.7.4 Air compressors should be equipped with temperature sensors, and when the temperature exceeds the limit, sound and light alarms should be triggered, and the power supply to the air compressor should be cut off.
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