In order to reduce the risk of coal mine accidents,the spontaneous combustion character-istics of typical coal samples in Huainan mining area are studied.With four coal samples of 6,8,11-2 and 13-1 from Huainan Zhangji Coal Mine as examples,the mass changes and the characteristics of gas-phase product precipitation of the coal samples are analyzed by thermogravimetric-infrared(TG-FTIR)coupling technology in the process of heating and oxidation.The experimental results show that the four coal samples can be divided into five stages,including six characteristic temperature points;and the activation energies of the coal samples during the combustion stage are 6,8,11-2 and 13-1 coal in descending order,and the intensities of absorption peaks of the main gas-phase products are 13-1,11-2,8 and 6 coal in descending order;and according to the activation energy and the intensity of the absorption peaks of the main gas phase products,the risk of spontaneous combustion of each coal sample was ranked from high to low as 13-1,11-2,8 and 6 coal.This paper can provide basic theoretical support for the prevention and control of mine fires in similar mining areas.
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