Judgment on Signs of Gas for Coal Spontaneous Combustion in Typical Integrated Mine

According to many damage zones in Maying Mine mining area damaged by previous small mines, serious ventilation leakage and other problems occurr ed in the typical integrated mine, coal samples collected from No. 9 coal seam were applied to the gas product simulation experiment of the coal spontaneous combusti on. The generation laws of CO, alkene, alkane and alkyne were analyzed, the prediction and forecast technology of the coal spontaneous combustion was conducted. T he results showed that CO would appear at about 61。C and the predicted temperature scope would be 61 ~ 175 °C. C 2 H 4 would appear at about 165 °C, which indica ted the coal was in an oxidation acceleration stage. C 3 H 6 would appear at about 216 °C, which indicated the coal in a violent oxidation stage. C 2 H 2 would generate at about 486。C, which indicted the coal with open fire or smoldering and the measures should be taken carefully. The φ( C2H 4)/φ( C 2 H 6) could be the signs of ga S in the coal spontaneous combustion process. Theφ(C3H8)/φ(C2 H 6) could be the auxiliary signs of gas to predict the coal spontaneous combustion process.