Experimental Study on Spontaneous Combustion Prediction System of No.12 Coal Seam in TongXin Coal Mine

To reduce coal spontaneous combustion hazards, establishing accurate and reliable prediction system, with 12 # coal seam with TongXin ore as object, using the large platform of coal spontaneous combustion simulation of coal spontaneous combustion process, the oxygen consumption rate, exothermal intensity and other characteristic parameters were analyzed, and based on the method of index gases, temperature programmed experiments, summarizes the characteristics of the temperature and gas change rule. The experimental results show that the oxygen consumption rate and heat release intensity increase with the increase of coal temperature. At 70.1 °C, it reaches the critical temperature of coal; at 132.7 °C, the dry cracking temperature of coal is reached;when the temperature is 244.8 °C, it reaches the growth temperature of coal; when the coal temperature is between 22.9.1-70.1 °C, CO and C 2 H 6 /CH 4 can be selected as the main index gas of No.12 coal seam in TongXin Mine; when the coal temperature is between 132.7-320.5 °C, CO can be selected as the index gas. Since C 2 H 4 can only be detected when the coal temperature reaches about 85 °C, C 2 H 4 and C 2 H 4 /CH 4 can be used as auxiliary marker gas.