Abstract
Thermal evolution of the oxidation characteristics of pulverized coal with different particle sizes and heating rates was investigated using a C600 microcalorimeter system. The results show that the evolution of oxidative heat of pulverized coal has obvious stage characteristics. With the increase of temperature, the changes of heat flow and DHF curve increase with the decrease of pulverized coal particle size and the increase of the heating rate. Thermal evolution of the oxidation process of pulverized coal is characterized by heat absorption first and then releasing heat, and the maximum heat release of Stage3 can reach 281.15 J. At the same heating rate, the activation energy of pulverized coal with different particle sizes generally shows E106-180> E75-106> E62-75. The decrease of the particle size and the increase of the heating rate lead to an increase in the spontaneous combustion tendency of coal.
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