College of Mining Engineering, Hebei United University Mining Development and Safety Technology Key Lab of
Hebei Province

为了考察煤的微观孔隙结构对其自燃倾向性的影响,选取气煤、肥煤和焦煤煤样为研究对象,通过压汞试验测量得到不同煤样的微观孔隙分布数据,结果分析表明:直径小于100 nm的孔隙分形维数在2~3内,煤样微观孔隙具有良好的分形特征,满足分形理论描述多孔介质的微观孔隙分布特性。通过煤自然发火模拟系统,对气煤、肥煤和焦煤煤样进行升温氧化模拟试验,并绘制煤样升温氧化过程中气体产物浓度随温度变化的曲线,试验结果显示了煤微观孔隙结构与其自燃倾向性的关系:煤样的变质程度越高,其内部结构越致密、内生裂隙相对较少,发生氧化反应的温度也越高。

In order to investigate the impact of microscopic pore structure of coal to its spontaneous combustion tendency, taking gas coal, fat coal and coking coal samples as the research objects, the microscopic pore distribution data of different coal samples were measured by using the mercury injection experiment. The results showed that pore fractal dimension was between 2 and 3 when the diameter less than100 nm, the coal fractal characteristics of microscopic pore was good, meeting th e fractal theory to describe the microscopic pore distribution properties of porous medium. The temperature programmed oxidation simulation experiment of gas coal, fa t coal and coking coal samples were done by coal spontaneous combustion simulation system, the curve of gas product concentration with temperature variation was dr awn, the experimental results showed the relationship between microscopic pore structure and its spontaneous combustion tendency: the metamorphic degree of coal s amples were higher, its internal structure was compact, endogenous fracture was relatively small, the temperature of the oxidation reaction was also higher.

教育部科学技术研究重点资助项目(211017)；