自燃煤层放顶煤开采采空区“三带”划分研究  

Three-zone distribution in goaf of top-coal caving mining in spontaneous combustion coal seam

作　　者：李飞 LI Fei(CCTEG Shenyang Research Institute,Fushun 113122,China;State Key Laboratory of Coal Mine Safety Technology,Fushun 113122,China)

机构地区：[1]中煤科工集团沈阳研究院有限公司,辽宁抚顺113122 [2]煤矿安全技术国家重点实验室,辽宁抚顺113122

出　　处：《煤炭工程》2023年第4期152-155,共4页Coal Engineering

摘　　要：针对采空区遗煤氧化升温导致火灾现象,采用现场实测方法,研究采空区O_(2)、CO、CH_(4)浓度以及温度变化特征,结合遗煤氧化升温特性,对采空区发火趋势进行了预测。研究结果表明:当工作面推进超过80 m时,煤体已经充分压实,氧气浓度降低制约遗煤氧化升温反应,采空区进入窒息带,CO浓度稳定在18×10^(-6);CH_(4)浓度变化随推进距离呈现连续增长趋势,略有下降后逐渐稳定,由工作面中部向两侧巷道纵向递减,最大CH_(4)浓度为1.15%;采空区各测点达到温度峰值呈现滞后性,工作面中部测点温度出现峰值时间早于回风巷早于进风巷,最高温度不超过21.2℃;采用氧浓度指标法确定氧化升温带为42.8 m,工作面最小安全推进速度0.658 m/d,在正常回采期间不会发生遗煤自燃现象。Aiming at the fire hazard caused by oxidation and heating of residual coal in goaf,field measurement method is used to study the variation of O_(2),CO,CH_(4) concentrations and temperature in the goaf,and the ignition trend of goaf is predicted combining with the oxidation and temperature rise characteristics of residual coal.The results show that:when the working face advances more than 80 m,the coal body has been fully compacted,the reduction of oxygen concentration restricts the oxidation and heating reaction of residual coal,the goaf enters the asphyxiation zone and the CO concentration is stable at 0.0018%.CH_(4) concentration grows continuously with the advancing distance and gradually stabilizes after a slight decrease.And it decreases longitudinally from the middle of the working face to the sidewalls of roadway,the maximum CH_(4) concentration is 1.15%.The peak temperature of each measuring point in the goaf lags behind,and the peak value appears earlier in the middle of the working face than the return air way and earlier than the intake air way,and the peak temperature is within 21.2℃.The oxygen concentration index method is used to determine that the oxidation temperature rise zone is 42.8 m,the minimum safe advancing speed of the working face is 0.658 m/d.

关 键 词：自燃煤层 三带划分 氧化升温 氧浓度指标 防灭火 

分 类 号：TD75[矿业工程—矿井通风与安全]