Research on Residual Coal Spontaneous Combustion and Early Prediction Technology in Fully Mechanized Caving Face

Through the analysis on the pressure energy distribution law in the main gate and tail gate in working face and on the sealing wall and the detection of the indicator gases in Dayangquan Coal Mine,the variation regularity of the air leakage,even air pressure and indicator gas including O2,CO,CO2,C2H6,C2H4 and C3H8 in the gob was obtained,which provided the technical support for the determination of the spontaneous combustion hazard and its development in the broken coal zone within the sealing walls of the main gate 2120 and 8124.Based on the characteristics of the residual coal spontaneous combustion in the gob,a comprehensive prevention and control system for residual coal spontaneous combustion was made from strengthening ventilation management,the detection of gas and temperature,fireproof by elimination of pressure difference,grouting three-phase foam and so on.