基于Fluent对火区下近距离煤层工作面CO异常涌入的数值模拟

Abnormal CO inrush numerical simulation of contiguous seams under fire area based on FLUENT

针对火区下近距离煤层工作面上部火区顶板垮落的危险情况,建立了采空区顶板垮落形成冲击气流的理论模型。在对采空区渗流特性进行分析的基础上,确定了采空区气体流动的数学模型。并结合龙华煤矿30110工作面的实际情况,确定了数值模拟的物理模型及相关参数设置。在工作面采用正压通风,上部采空区发生顶板垮落情况下利用Fluent软件对采空区的漏风及CO分布情况进行了数值模拟。模拟结果与现场实际情况一致,充分说明了正压通风对于保障火区下近距离煤层工作面安全开采的重要性。

According to the particularity of mining contiguous seams under fire area, considering the special case of roof caving in the upper fire area, the theoretical model of impact air-flow hazard after roof caving was established. Based on the analysis of seepage characteristics in the goaf mathematical model was determined. Then the paper determined the physical model of numerical Simulation and the setting of related parameters and did the numerical simulation of air leakage and distribution of CO under the condition that the working face applied positive pressure ventilation and roof caved in the upper fire area by Fluent. The simulation results are consistent with the site actual conditions which speak volumes for the importance of positive pressure ventilation to guarantee the safety mining of working face of contiguous seams under fire area.