煤低温氧化动力学参数与粒度关系实验研究

探讨煤样粒度与表征煤氧化速度的活化能、指前因子的关系，了解粒度对煤的氧化反应速率等自然参数的影响，通过不同粒度东滩煤样的程序升温实验，测定了其不同温度下在空气中的耗氧速度。利用回归分析计算出反应的指前因子及活化能，并进行了分析。研究发现，随粒度降低，煤样氧化的活化能和指前因子均增加，并且在3mm处出现了突跃现象。说明煤的自燃性取决于粒度小于3mm颗粒的比例，而不是其平均粒度。

Study on Dynamic Parameters of Coal Oxidation in Lower Temperature Varying with Particle Size by Means of Programmed Heating Experiment

The effect of particle size on spontaneous combustion parameters like reaction rate of coal with oxygen is tremendous. However, up to now, seldom is there any report on the relation between kinetic parameters of coal oxidation and particle size. By means of programmed heating experiments, oxygen consumption rate of coal with different particle size is determined, pre-exponential factors and activation energy of the coal samples are calculated through regression analysis, and relationship between particle size and kinetic parameters is determined eventually. Pre-exponential factor and activation energy increase as particle size of the coal samples react with oxygen increases. As particle size decreased from a larger diameter to the smaller one below 3 millimeter, activation energy and pre-exponential factors increase suddenly. It proved that self-ignition of coal depends on the proportion of the coal particle smaller than 3 millimeter rather than the average particle size.