The Law Of Gas Releasing In Heating And Oxidation Process Of Coal

In order to study the law of coal spontaneous combustion and oxidation process in different particle sizes, according to the theory of all-stage coal spontaneous combustion experiment by using a new designed oven, a set of temperature programming experiments using Wuhu coal samples selected in Inner Mongolia Autonomous Region were conducted. CO, C2H4, C2H6 and C3H8 generated in the experiment were analyzed, the corresponding relationship between gas generation and coal sample temperature was found, and indicator gases for the Wuhu coal were obtained. CO can be used as the indicator gas, C2H4, C2H6 can be auxiliary indicator. When the particle size of coal samples is smaller, the crossing-point temperature will be lower, the spontaneous combustion tendency can be stronger. The wider the coal granule size range is, the easier it can be self-ignited. The results can be helpful in terms of safety and prediction of the spontaneous combustion tendency.