采空区自燃火区温度场演化规律分析研究

Sduty of Temperature Evolution of Spontaneous Combustion Area in Goaf

鉴于采空区遗煤自燃环境的封闭、隐藏及动态等特殊性,根据传热学、燃烧学、多孔介质学等基础理论,运用FLAC软件自身携带的热力耦合功能,对石圪节煤矿3#煤层采空区A、B火区温度场进行了理论计算和数值模拟,得出了遗煤厚度是自燃的物质基础,采空区漏风量是自燃的决定因素,燃烧时间是温度场的关键因子,温度场则是自燃的宏观表现。模拟方案中改变遗煤厚度、漏风量等影响因素的参数,得出了火区温度场的时空演变趋势,为下层煤开采设计提供理论参考。

In view of special environment of coal spontaneous combustion in goaf such as closed,hidden and dynamic,the theoretical calculation and numerical simulation of A and B temperature evolution of spontaneous combustion area in goaf are made according to heat transfer,combustion theory、porous medium theory and so on,by FLAC thermal coupling function.draw the conclusion that thickness of residual coal is material base of spontaneous combustion and goaf air leaking is its determinants,burning time is the key factor of the temperature field and the temperature field is the macroreaction of sontaneous combustion.The temperature evolution of spontaneous combustion area in goaf was obtained from different parameters such as thickness of residual coal and goaf air leaking in schemes,which will provide some references for mining design of lower seam.