复合采空区遗煤自燃极限参数变化及危险区域判定  

Limit parameter changes and hazardous area determination of residual coal spontaneous combustion in compound goaf

作　　者：章飞[1,2] ZHANG Fei(State Key Laboratory of the Gas Disaster Detecting,Preventing and Emergency Controlling,Chongqing 400037,China;CCTEG Chongqing Research Institute,Chongqing 400037,China)

机构地区：[1]瓦斯灾害监控与应急技术国家重点实验室,重庆400037 [2]中煤科工集团重庆研究院有限公司,重庆400037

出　　处：《矿业安全与环保》2020年第4期66-72,共7页Mining Safety & Environmental Protection

摘　　要：特厚煤层采用分层综放开采时,上分层遗煤易发生二次氧化,致使煤自燃预防和治理的难度加大。为了准确判定下沟矿ZF1801工作面上、下分层采空区遗煤自燃危险区域,通过程序升温实验分析4^#煤层煤的自燃极限参数,并根据气体监测数据判定采空区遗煤自燃危险区域。研究结果表明:4^#煤层煤的耗氧速率和放热强度随温度的变化均符合高斯型函数关系;随遗煤厚度的增加,下限氧气体积分数逐渐降低,而上限漏风强度逐渐升高;当遗煤厚度一定,温度达到90℃时二者的极限参数最低;遗煤自燃危险区域在ZF1801工作面下分层采空区回风侧20~125 m、宽105 m,在上分层回风巷、进风巷侧0~40 m、宽40 m;当ZF1801工作面推进速度低于2.34 m/d且停采28 d以上时,采空区存在自燃危险。研究结果可为下分层综放工作面末采期间采空区自燃危险区域判定提供参考。Secondary oxidation of residual coal is easy to occur in the upper layer when the layered fully mechanized mining is used in the extra-thick coal seam,which makes it more difficult to prevent and control coal spontaneous combustion.In order to accurately determine the hazardous area of spontaneous combustion in upper and lower stratified goaf in ZF1801 working face of Xiagou Coal Mine,the spontaneous combustion limit parameters of 4^#coal seam were analyzed through programmed heating experiment,and the hazardous area of residual coal spontaneous combustion in goaf was analyzed according to the gas monitoring data.The results show that the oxygen consumption rate and exothermic intensity of 4^#coal seam change with temperature both in accordance with Gaussian Function relationship;with the increase of residual coal thickness,the lower limit of oxygen concentration gradually decreases,while the upper limit of air leakage intensity gradually increases;when the residual coal thickness is constant and the temperature reaches 90℃,the limit parameters of the two are the lowest;the hazardous area of residual coal spontaneous combustion is 20 m to 125 m on the return air side of lower stratified goaf`in ZF1801 working face and its width is 105 m,while it is 0 m to 40 m on side of upper layered return air roadway and inlet air roadway and its width is 40 m;when the advancing speed of the working face is lower than 2.34 m/d and its mining is stopped for more than 28 days,there is a danger of spontaneous combustion in the goaf.The results can provide reference for the determination of spontaneous combustion hazardous area in goaf during the final mining period in lower layered fully mechanized working face.

关 键 词：特厚煤层 分层开采 复合采空区 遗煤自燃 极限参数 自燃危险区域 

分 类 号：TD752.2[矿业工程—矿井通风与安全]