【摘要】 结合东滩煤矿的现场实际,采用ZRM-15型煤自然发火实验装置对东滩矿煤样进行了历时78 d的煤自然发火实验,模拟了从常温至452.7℃煤自燃的全过程,掌握了煤自燃高温区域的发生、发展及其动态变化过程和指标气体体积浓度随温度的变化趋势。实验结果表明:实验装置内煤体高温点动态变化的总趋势是由煤体中上部向下部移动。氧化初期,距供风表面一定距离的炉体中上部温度变化较快;随着煤氧化时间加长,温度变化较快的区域不断向进风侧移动,高温点最终移至供风侧煤体表面,形成明火。更多还原

【Abstract】 Combined with practical conditions of Dongtan colliery,an experiment of spontaneous combustion of coal samples lasted for 78 days was conducted by using the ZRM-15 experimental apparatus,simulating the whole process of coal spontaneous combustion from normal temperature to above 452.7 ℃,and mastering the generation,develop-ment and dynamical change of high temperature zone induced by coal spontaneous ignition and the dynamical change trend of volume and concentration of the indicative gas with the temperature.The results showed that the whole trend of dynamical change at high temperature point was moved from upper part to lower part in coal body.During initial period of oxidation,the temperature change rate at upper part of the furnace above the air supply point was higher.Along with lengthening of coal oxidation,the region with higher change rate of temperature would conti-nuously move toward the side of air intake and the high temperature point would finally move to the surface of coal body at the side of air intake,forming the naked light.更多还原