为研究粒径对煤自燃特性的影响，以刘庄矿8煤为研究对象，开展不同粒径煤样的程序升温实验，构建煤样耗氧速率、气体产物生成速率与温度及粒径的关系模型。研究结果表明，煤样耗氧速率、气体产物生成速率随着煤样粒径的增大先线性减小后迅速下降，且温度越高，粒径对煤自燃特性参数的影响越大；当煤样粒径从0.125 mm增大至0.425 mm时，煤样的临界温度从80 ℃降低至60 ℃，干裂温度从120 ℃降低至110 ℃；在临界温度前煤的活化能随着粒径增大而逐渐增大，但混合粒径范围越大，活化能相应减小，而在干裂温度后煤的活化能变化规律与此相反；在一定粒径及温度范围内，煤样耗氧速率、气体产物生成速率随煤样粒径及温度的变化规律可用2D高斯函数分布来描述。

To investigate the influence of particle size on spontaneous combustion characteristic of coal, by taking No.8 coal in Liuzhuang Coal Mine as the research object, the programmed temperature experiment of coal samples with different particle sizes was carried out, and the relationship model of oxygen consumption rate, gas product generation rate and temperature and particle size of coal samples was established. The results indicate that the oxygen consumption rate and gas product generation rate of coal sample decreases linearly first and then rapidly with the increase of coal particle size, and the higher the temperature, the greater the influence of particle size on coal spontaneous combustion characteristic parameters. When the particle size of coal sample increases from 0.125 mm to 0.425 mm, the critical temperature of coal sample decreases from 80 ℃ to 60 ℃, and the dry cracking temperature decreases from 120 ℃ to 110 ℃. The activation energy before the critical temperature gradually increases with the increase of particle size, but the larger the range of mixed particle sizes, the activation energy decreases correspondingly. The change law of coal activation energy after the cracking temperature is opposite to this. In a certain range of particle size and temperature, the variation of oxygen consumption rate and gas product rate of coal sample with particle size and temperature can be described by 2D Gaussian function distribution.