Study on Simulation of Coal Spontaneous Combustion Process Based on Large Coal Pile Experiment Rig

In order to study the spontaneous combustion law of No.15 seam in Wangtaipu Mine,a large coal storage pile experiment rig was applied to the experiment simulation study.With the temperature variation conditions of coal measured with the thermal electric couples,the coal sample spontaneous combustion feature parameters were obtained including the temperature rising rate in the coal,the oxygen consumption speed,the critical temperature and dry fracturing temperature.In combination with the gas phase chromatographer,the index gas occurred from the coal spontaneous combustion process was analyzed.The results showed that when the coal temperature was below 80 ℃ of the critical temperature,the thermal value occurred from the oxidized reaction process of coal would low,the oxygen consumption speed of coal sample would low and the spontaneous combustion of the coal would be difficult to be occurred.When the critical temperature was 80~110 ℃,the oxygen consumption speed would be steadily increased and the reaction would be steadily enhanced.When the coal temperature was over 110 ℃ of the dry fracturing temperature,the oxidized reaction would rapidly increased and the thermal emission value would be increased.Meanwhile,the CO and CO2 production rate would be increased and the spontaneous combustion of the coal would be easily occurred.