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Method and device for passive fire extinguishing of liquid carbon dioxide in underground coal mine

A technology of liquid carbon dioxide and fire extinguishing device, which is applied to the method of container discharge, the installation device of container structure, fire prevention and other directions, can solve the problems of lag in fire prevention and extinguishing measures, prone to fire, monitoring and prevention difficulties, etc., to overcome the time lag. , low cost, good effect of promotion and application value

Active Publication Date: 2016-08-17
四川省科建煤炭产业技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention overcomes the deficiencies of the prior art, and provides a method for passive fire prevention and extinguishing of liquid carbon dioxide in coal mine goafs or blind alleys and the implementation of the device, in order to solve the problem of fire hazards in goafs or blind alleys. Problems such as fire outbreak, delay in fire prevention and extinguishing measures, and difficulty in monitoring and prevention

Method used

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  • Method and device for passive fire extinguishing of liquid carbon dioxide in underground coal mine
  • Method and device for passive fire extinguishing of liquid carbon dioxide in underground coal mine

Examples

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Effect test

Embodiment 1

[0030] Vacuumize the tank body of the above-mentioned device of the present invention, and the vacuum degree is 5KPa, then inject sulfur hexafluoride gas from the liquid carbon dioxide injection port, and then inject liquid carbon dioxide (temperature -18~-20°C), sulfur hexafluoride gas and liquid The volume ratio of carbon dioxide is 0.5:1000, and the internal pressure of the tank after filling is 2MPa, then close the cryogenic ball valve at the injection port of liquid carbon dioxide. The above-mentioned device filled with liquid carbon dioxide is placed anywhere behind the working face of the mine, in the goaf or blind alley of the coal mine, or the device of the present invention is placed in the area where the threat of fire is considered to be high. For example, the device of the present invention is pre-placed in the goaf, and can be put into the goaf from the upper corner or the lower corner, and then tied to the handling handle with a steel wire rope, and the device of...

Embodiment 2

[0032] Vacuumize the tank body of the above-mentioned device of the present invention, and the vacuum degree is 9KPa, then inject sulfur hexafluoride gas from the liquid carbon dioxide injection port, and then inject liquid carbon dioxide (temperature -18~-20°C), sulfur hexafluoride gas and liquid The volume ratio of carbon dioxide is 1:1000, the internal pressure of the tank after filling is 3MPa, and then close the cryogenic ball valve at the injection port of liquid carbon dioxide. The above-mentioned device filled with liquid carbon dioxide is placed anywhere behind the working face of the mine, in the goaf or blind alley of the coal mine, or the device of the present invention is placed in the area where the threat of fire is considered to be high. Blind alley is a closed roadway, and people cannot go inside, and the coal inside may also be natural. Steel wire ropes can be used to be tied on the carrying handle, and the device of the present invention can be pulled to a su...

Embodiment 3

[0034] Vacuumize the tank body of the above-mentioned device of the present invention, and the vacuum degree is 10KPa, then inject sulfur hexafluoride gas from the liquid carbon dioxide injection port, and then inject liquid carbon dioxide (temperature -18~-20°C), sulfur hexafluoride gas and liquid The volume ratio of carbon dioxide is 0.8:1000, the internal pressure of the tank after filling is 2.5MPa, and then close the cryogenic ball valve at the injection port of liquid carbon dioxide. The above-mentioned device filled with liquid carbon dioxide is placed anywhere behind the working face of the mine. Along with the advancing of working face, above-mentioned device just is farther and farther away from working face. When the residual coal and oxygen in the goaf undergo a chemical reaction and the heat generated is greater than the heat taken away by the wind, the temperature of the coal body rises. When the ambient temperature is higher than 31°C (the normal temperature in ...

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Abstract

The invention discloses a device for carrying out passive fire prevention and extinguishment by liquid carbon dioxide. A carrying handle, a liquid carbon dioxide filling port and a liquid carbon dioxide release port are formed in a tank body of the device; a low-temperature ball valve is arranged at the liquid carbon dioxide filling port; a safety valve is arranged at the liquid carbon dioxide release port; a set pressure of the safety valve is 7MPa. The invention also discloses a method for carrying out underground coal mine fire prevention and extinguishment by adopting the device. After being vacuumized, the device is filled with sulfur hexafluoride gas and liquid carbon dioxide; then the device is placed in a region which easily catches a fire, such as a gob or a blind lane; when the temperature of the device reaches a preset temperature, the device takes effects; whether the region where the device is placed catches a fire or has a trend of catching the fire is judged every day by detecting whether the air contains the sulfur hexafluoride gas. The invention overcomes the defect of time delay of fire prevention and extinguishment of the prior art; the used device and method are simple, are convenient to operate, are wide in gas sources, are low in cost, have a good fire extinguishing effect and are easy to detect.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of coal mine safety, and more specifically, the embodiments of the present invention relate to a method and device for passive fire prevention and extinguishing of liquid carbon dioxide in goafs or blind alleys in coal mines. Background technique [0002] Coal mine fire is one of the main disasters restricting the safety of coal mine production, that is, in the process of coal mine mining, gobs often bring harm to the normal production of coal mines. Because there is a large amount of floating coal left in the goaf during coal mining, the existence of floating coal provides material conditions for spontaneous combustion in coal mines. Spontaneous combustion in coal mines seriously threatens the safe production of coal mines and restricts the production of coal mines, and the spontaneous combustion of coal mines in goafs occupies an important part in the total occurrence of spontaneo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F5/00F17C1/14F17C13/04F17C13/00
CPCE21F5/00F17C1/14F17C13/00F17C13/04F17C2201/054F17C2205/0323F17C2205/0332F17C2221/013
Inventor 蒋志刚伍厚荣高正强唐金陵陈曦余玉江
Owner 四川省科建煤炭产业技术研究院有限公司
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