Study on the influence of coal spontaneous combustion processin goaf on thermal environment of working face in high ground temperature mine
The coal mining face is the most serious area of heat damage in high-temperature mines,and the high temperature generated by spontaneous combustion of coal in goaf will exacerbate the heat damage of working face.The influence of coal spontaneous combustion process in goaf on the thermal environment of working face under dynamic advancing of working face was studied through numerical simulation method,and the improvement effect of thermal environment under different inlet air temperature conditions of working face was predicted.The research results indicated that under normal advancing speed of the working face,the spontaneous combustion process of coal in the goaf had little impact on the thermal environment of the working face;when the working face advancing at 2.4 m/d for 30 days,the average temperature of the working face only increased by 0.3 ℃,and the temperature at the return air corner increased by 0.6 ℃;when a coal spontaneous combustion fire occurred in the goaf,the temperature at the return air corner of the working face exceeded 1 ℃;when the inlet air temperature of the working face was 20 ℃,the average temperature of the working face reduced by 4.8 ℃ compared with the inlet air temperature of 27 ℃.This research result could provide theoretical reference for the treatment of heat damage in high-temperature mining working faces.
mine heat damagemine goafspontaneous combustion of coalcoal mining facenumerical simulation
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