中文摘要：

为了研究粒径对松散煤体自燃的影响,利用自制试验装置对松散煤体进行了绝热低温氧化试验.在试验过程中,对煤样的温度及试验装置出口氧体积分数进行监测,得到了各煤样的氧化升温及耗氧规律.研究结果表明,总体上煤样的平均氧化升温速率和在同一温度下的耗氧速率随煤样粒径的增加而减小,耗氧及温升拐点出现也较晚;煤样粒径与拐点温度近似呈对数函数关系,与拐点出现时间近似呈二次抛物线函数关系;混合煤样的氧化升温过程受其比表面积和空隙率的共同影响,粒径越小,空隙率对混合煤样氧化升温的影响比重越大;混合煤样加权粒径越小,各粒径煤样间的相互影响越强;混合煤样中各煤样间的粒径差距越大,煤样间的相互影响越弱.

英文摘要：

In order to find out the regularities of particle size influencing loose coal spontaneous combustion,adiabatic experiments of low temperature oxidation on loose coal were designed,based on a self-developed device.The temperature of coal samples and the oxygen volume fraction at device outlet were observed in the experiments.The regularities of temperature rise and oxygen consumption were obtained. The results show that the average value of oxidation heating rate and that of the oxygen consumption rate at the same temperature of loose coal with composite particle size were inversely proportional to the coal particle size on the whole,that the occurrence of the knee points of the oxygen consumption and the temperature rise were late with the increase of coal particle size,that the relationship between the particle size of coal and the temperature of knee point is a logarithmic function,and that the relationship between the particle size of coal and the occurrence of the knee point is a parabolic function. The oxidation process of loose coal with composite particle size is affected by its porosity and specific surface area. The effect proportion of porosity is inversely proportional to the coal particle size. When the weighted size of loose coal is smaller,the interrelationship of coal samples is stronger. With the difference of particle size between coal samples becoming larger,the interrelationship of coal samples becomes weaker.