Underground coal mine cooling method

Abstract

The invention provides an underground coal mine cooling method, which comprises the following steps of (1) conveying liquid nitrogen in a liquid nitrogen tank wagon into a liquid nitrogen chamber in an underground coal mine; (2) conveying the liquid nitrogen in the liquid nitrogen chamber into a finned tube, and exchanging heat between the liquid nitrogen and air outside the finned tube; (3) after heat exchange, conveying low-temperature air outside the finned tube to a working face goaf through a fan, and cooling the working face goaf; (4) gasifying the liquid nitrogen in the finned tube into nitrogen after heat exchange, and conveying the nitrogen to the working face goaf of the coal mine to further cool the working face goaf. According to the underground coal mine cooling method, the working face and the goaf are cooled by using a liquid nitrogen gasification characteristic, the gasified nitrogen can also enable an oxygen concentration distribution range in the goaf to be obviously narrowed and has an effect of inerting internal air of the goaf to effectively control spontaneous ignition of the goaf, the liquid nitrogen gasification is carried out in closed pipelines and devices, and refrigerated cold air is mixed with hot air to fulfill the cooling aim.

Description

technical field [0001] The invention relates to a cooling method, in particular to a coal mine cooling method. Background technique [0002] With the development of society and the increasing development of coal resources, the mining depth of mines continues to increase. With the construction of high-yield and high-efficiency mines and the continuous extension of mining depths, affected by the heat dissipation of surrounding rocks and electromechanical equipment and the gradient of ground temperature, underground heat damage It has become an important factor affecting mine safety production. According to the 2008 survey data of the my country Coal Research Institute, 65 pairs of mines in China have experienced heat damage to varying degrees, of which 38 pairs of mines have mining face temperatures exceeding 30°C. For example, Shenhua Ningyang Coal Mine Yangchangwan Coal Mine, the lower part of Mining Area 12 and Mining Area 13 of Shaft No. 1 of Shenhua Ningmei Coal Mine Yan...

AI Technical Summary

Problems solved by technology

According to on-site measurements, the initial temperature of the coal mining face is generally 31°C to 34°C. In summer, the temperature in the return air tunnel of the working face reaches 34°C, and the relative humidity exceeds 95%. The working face is hot and humid, which can easily induce eczema, Heatstroke and other high-temperature diseases will seriously affect the normal operation of underground electromechanical equipment, affecting the safe production of the mine. As the mining depth of the mine further increases, the temperature of the coal mining face will further increase, and the heat damage of the mine will become more serious.

Images