Fire Prevention Technology by Full-section Shotcrete Plugging During Equipment Recycling of Fully Mechanized Caving Face

Taking No.1305 working face equipment recycling period of Dananhu No.1 mine of Shenhua Guoneng Hami Coal Power Co., Ltd. as the research object, based on the data of the surface coal temperature of the goaf collected by the infrared thermal imager and the gas volume fraction of the goaf analyzed by the gas chromatograph, the OriginLab data analysis software is used to systematically analyze the changes in the surface coal temperature and the gas volume fraction of the goaf before and after full-section shotcrete plugging. The results show that after full-section shotcrete plugging of surface coal in the goaf, the heat dissipation period is about 5 days and the heat stabilization period is about 5 days. Then, the surface temperature of the coal increases by about 0.5 to 1　℃ every 2 days; the volume fraction of O2 decreases about 3%~4% and N2 increases about 3%~4% in the goaf.