摘要
为了研究公乌素煤矿16^(#)煤层采空区在上覆多层采空区影响下,各气体浓度分布特征及温度场动态运移规律,基于采空区多场耦合作用机理,建立了动态数学模型,利用流体计算软件CFD对采空区流场、温度场进行数值模拟。结果表明:对于16^(#)煤采空区,其高氧浓度区域主要位于进风侧和回风侧,在进风巷侧形成宽为70 m的高CO_(2)浓度带,向回风巷方向高CO_(2)浓度带逐渐减小;回风侧甲烷浓度最低值位于停采线附近,最高温度达到44℃。对于上覆采空区,高氧浓度区域主要集中在工作面进风巷附近的上部以及停采线附近,均未形成蔓延至回风巷侧的CO_(2)浓度带,进风侧甲烷浓度呈扇形向采空区内部逐渐升高。上覆采空区不会影响到16^(#)煤层的安全回采,对探究公乌素煤矿遗煤自然发火的演化规律具有借鉴意义。
In order to study the distribution characteristics of gas concentrations and the dynamic migration law of temperature field in the goaf of the No.16 coal seam of Gongwusu coal mine under the influence of the overlying multi-layer goaf,a dynamic mathematical model was established based on the coupling mechanism of multiple fields in the goaf,and the flow field and temperature field of the goaf were numerically simulated by using the fluid calculation software CFD.The results show that for the No.16 coal goaf,the high oxygen concentration area is mainly located on the inlet side and the return air side,and a high CO_(2)concentration band with a width of 70 m is formed on the side of the air inlet roadway,and the high CO_(2)concentration band gradually decreases in the direction of the return air roadway.The lowest methane concentration on the return air side was located near the stoppage line,and the maximum temperature reached 44℃.For the overlying goaf,the high oxygen concentration area is mainly concentrated in the upper part near the air inlet lane of the working face and near the stop line,and the CO_(2)concentration zone that spreads to the side of the return air lane does not form a CO_(2)concentration zone,and the methane concentration on the air inlet side gradually increases to the inside of the goaf in a fan shape.The overlying goaf will not affect the safe mining of the No.16 coal seam,which has reference significance for exploring the evolution law of natural ignition of the residual coal in Gongwusu coal mine.
作者
李孟达
李辉
梁强强
LI Mengda;LI Hui;LIANG Qiangqiang(CCTEG Shenyang Research Institute Co.,Ltd.,Fushun 113122,China;National Key Laboratory of Coal Mine Disaster Prevention and Control,Fushun 113122,China;CHN Energy Wuhai Energy Huangbaici Mining Co.,Ltd.,Wuhai 016000,China;Wuhai Gongwusu Coal Industry Co.,Ltd.,Wuhai 016000,China)
出处
《煤炭技术》
2025年第6期62-66,共5页
Coal Technology
关键词
多层采空区
多场耦合
动态运移
自然发火
multi-layer goaf
multi-field coupling
dynamic migration
natural ignition
