煤巷高冒区自燃升温特征的数值模拟  

Numerical Simulation Study of Heating up Features During Spontaneous Combustion in Coal Roadway Caving Zoo

作　　者：刘星魁 LIU Xingkui(College of Safety Engineering,Henan Institute of Engineering,Zhengzhou 451191,China)

机构地区：[1]河南工程学院安全工程学院,河南郑州451191

出　　处：《湖南科技大学学报（自然科学版）》2022年第3期1-6,共6页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：河南省高等学校重点科研项目资助(19A620001)。

摘　　要：为了了解煤巷中高冒区由自燃引起的温度变化规律,利用数值方法分析了高冒区内漏风趋势,以及100 m长度煤巷温度受高冒区自燃的影响,并与热成像采集数据进行了比对.结果表明:迂回进出高冒区的漏风引起温度上升,高温区位置与以漏风风速标准划分的易自燃区吻合;高冒区自燃会沿风向引起下游碎煤同时升温,并连成一片;充分供氧前,风速提高会加快高冒区升温速率,充分供氧后,则反之,而孔隙率对升温速率影响仅体现出单调增减关系.依据研究结论,控制煤巷自燃首先应对高冒区及时密闭,完全密闭情况下可显著降低高冒区内温度,并防止由自燃衍生出的二次高温区,条件允许时应尽量延长密闭墙长度.Aiming at studying heating up features during spontaneous combustion in coal roadway caving zoo, the numerical simulation method is used to analyze the caving zoo air leakage direction and its influence on 100 m coal roadway. Results are also companied with thermal imager data. The computation results indicate that heating up reason is the air lekage which detours into and out the caving zoo, and the high temperture zoo positon also fits the easy combusition area which is divided by air leakage velocity standard. The spontaneous combustion in caving zoo can lead to broken coal heating up in downstream along wind, and these two areas will be connected into one piece. Before adequate oxygen supply, increasing wind velocity can speed up heating up rate in caving zoo and reverse effect results exist after it, and porosity only reflects monotone decreasing effect to the heating up rate. According to the research conclusion, the caving zoo should be airtight first when controlling coal roadway spontaneous combusion, obturation can decrease temperature in caving zoo and prevent second high temperature zoo which is induced by caving zoo, finally the obturation should extend as long as possible when adaptive condition permits.

关 键 词：高冒区 漏风 煤巷 温度 下游 

分 类 号：TD712[矿业工程—矿井通风与安全]