Mine Fire Prevention and Control Technology in Solids Backfill Coal Mining Face

According to the residual coal spontaneous combustion occurred in the mining process of No.63d04-1 fully-mechanized solid backfill coal mining face in Jining No. 3 Mine,a comprehensive analysis was conducted on the spontaneous combustion conditions of the goaf in coal mining face and the goaf in neighboring coal mining face to judge the locations of spontaneous combustion. According to the difficulties in the solid backfill coal mining face,for example,the fire source was high,the backfill mass was imperfect compacted,the goaf scope was wide ,the air leakage radius was large,the spontaneous combustion speed was fast and others,so the coal mi ning face sealed,nitrogen injection,equalized pressure,liquid carbon dioxide injection,and other fire prevention and control methods were applied to control the residual coal spontaneous combustion. The monitoring results showed that after the fire controlled,the carbon monoxide volume fraction in the fire zone would be reduced from 7 231 x 10-6to below 24 x 10-6 ethylene volume fraction would be reduced from 129 x10-6to 0,acetylene volume fraction would be reduced from6. 47 x 10-6to O,the re sidual coal spontaneous combustion in the goaf was effectively controlled.