Liquid nitrogen cooling and fireproof device for coal mine

Abstract

The invention discloses a liquid nitrogen cooling and fireproof device for a coal mine, and relates to the technical field of coal mine liquid nitrogen fire prevention. The liquid nitrogen cooling andfireproof device aims to improve the environmental monitoring function, and specifically comprises a liquid nitrogen device and a monitoring mechanism. A control room is arranged on one side of the liquid nitrogen device. An electric control valve is arranged at the output end of the liquid nitrogen device. The electric control valve is electrically connected with the control room. The monitoringmechanism comprises heat transfer plugs, a mounting frame and an expansion air bag. A heat conducting column is fixed to the inner wall of the mounting frame through a screw. An expansion air bag sleeves the circumferential out wall of the heat conducting column. The outer wall of the heat conducting column is matched with the size of the expansion air bag. The heat transfer plugs are respectively connected with the outer wall of the bottom of the heat conducting column through heat transfer guide wires. One side of the expansion air bag is provided with a moving plate. According to the liquid nitrogen cooling and fireproof device for the coal mine, due to the arrangement of the plurality of heat transfer plugs and the expansion air bag, the liquid nitrogen device can output nitrogen through the electric control valve according to the specific environment situations, and the effect of cooling and fire prevention is achieved; and in addition, because the heat transfer guide wires havecertain lengths, multi-position monitoring can be conducted.

Description

technical field [0001] The invention relates to the technical field of liquid nitrogen fire prevention in coal mines, in particular to a liquid nitrogen cooling and fire prevention device for coal mines. Background technique [0002] In recent years, top coal caving has been carried out rapidly in my country. This method throws a lot of coal in the goaf, resulting in a large area of ​​dangerous accumulation of coal, which is very easy to cause spontaneous combustion of coal. At this time, the effect of nitrogen injection is the most significant for fire extinguishing. In addition, in some cases Under normal circumstances, coal powder accumulation often exists inside the mining area, posing potential safety hazards; at present, the automatic cooling of fire protection devices is mostly based on the monitoring of air temperature, and effective and reliable monitoring of the inside of the accumulated coal powder cannot be carried out, so there may be coal powder The phenomenon th...

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Problems solved by technology

The fire extinguishing equipment in the above-mentioned patent has the following disadvantages: the detection of the external environment temperature is too rough, and because the pulverized coal is generally stacked to prevent, and the pulverized coal is flammable, the above-mentioned device cannot reliably detect the internal temperature of the accumulation of pulverized coal, so as to objectively It reflects that in a certain environment, the fire prevention capability is still lacking.

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