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.

中文翻译：

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不同粒径和升温速率煤粉氧化特性的热演化

摘要 使用C600 微量热仪系统研究了不同粒径和加热速率的煤粉氧化特性的热演化。结果表明，煤粉氧化热的演化具有明显的阶段性特征。随着温度的升高，热流和DHF曲线的变化随着煤粉粒径的减小和升温速率的增大而增大。煤粉氧化过程的热演化特点是先吸热后放热，Stage3最大放热可达281.15 J。在相同升温速率下，不同粒径煤粉的活化能一般表现为E106-180> E75-106> E62-75。