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为研究工作面回采条件下采空区氧气浓度场分布规律,建立了采空区3D几何模型及遗煤耗氧升温的控制方程组,利用FLUENT软件的动网格功能实现工作面回采,通过数值模拟手段进行研究。结果表明:按氧浓度划分采空区自燃“三带”时,自燃带随着工作面回采向前移动;回采速度一定时,自燃带宽度随时间变化很小,可近似认为保持不变,且进风巷侧自燃带宽度最大,倾向中央及回风巷侧自燃带宽度相差不大,自燃带近似呈“L”型。
In order to study the distribution rule of oxygen concentration field in goaf under the conditions of working face recovery, a 3D geometric model of goaf and the governing equations of oxygen uptake by coal during coal mining were established. The working face was recovered by the dynamic grid function of FLUENT software. The numerical simulation Means to study. The results show that when the spontaneous combustion zone is divided into spontaneous combustion and “three zones” according to the oxygen concentration, the spontaneous combustion zone moves forward along with the working face recovery; when the recovery rate is constant, the spontaneous combustion zone width changes little with time and can be approximated as unchanged , And the maximum self-ignition band width of the inlet side of the air inlet, the width of the self-ignition band of the center of the return airway and the side of the return air path are not much different, and the spontaneous combustion band is approximately “L” type.