低O_2含量条件下煤自燃产物生成规律的实验研究  

Experimental Research on Combustion Product Formation During Coal Spontaneous Combustion Under Reduced Oxygen Concentrations

作　　者：周福宝[1] 邵和[1] 李金海[1] 张晞[1] 史波波[1] 

机构地区：[1]中国矿业大学安全工程学院煤炭资源与安全开采国家重点实验室,江苏徐州221116

出　　处：《中国矿业大学学报》2010年第6期808-812,共5页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(50604014);教育部新世纪优秀人才资助项目(NCET-08-0838);中国矿业大学煤炭资源与安全开采国家重点实验室开放研究基金项目(09KF11)

摘　　要：针对采空区自燃带、巷道高冒区、封闭火区等自燃危险区域内O2体积分数φ(O2)低于矿内大气中O2含量的实际情况,开展了φ(O2)分别为21%,17%,13%,9%,5.8%的煤自燃试验,分析了氧化产物CO,C2H4,CO2的生成规律.结果表明,氧化产物的生成随φ(O2)的降低总体呈现"滞后效应":氧化产物生成的初始温度滞后;相同温度时氧化产物的生成量减小.由于滞后效应的存在,如按正常O2含量条件下测定的煤自燃特性预测自燃进程,会造成延迟预报或误报,因此,采用实际O2含量测定煤的自燃特性更符合现场情况.The volume fraction of oxygen in areas prone to spontaneous combustion,such as the spontaneous combustion zone of the goaf,the high caving area of the roadway,or the sealed fire zone,is lower than the oxygen concentration in the mine,itself.Model experiments simulating spontaneous combustion were carried out at 21,16,13,9,and 5.8percent volume fractions of oxygen.The formation of the oxidation products CO,C2H4,and CO2was studied.The formation of oxidation products shows a hysteresis effect at reduced oxygen concentrations：The temperature for initial production is suppressed and the amount of products produced decreased.When the normal volume fraction of oxygen is used to predict spontaneous combustion a delayed,or fallacious,prediction is caused by the hysteresis effect.The use of actual volume fractions of oxygen would better fit the practical situation when testing for potential coal spontaneous combustion.

关 键 词：煤自燃 低O2含量 氧化产物 滞后效应 

分 类 号：TD75[矿业工程—矿井通风与安全]