数值模拟研究确定高抽巷最佳位置

Numerical Simulation Study to Determine Best Position of High Pumping Alley

为了确定高抽巷抽采瓦斯的合理位置,通过构建19201工作面采空区瓦斯运移模型,借助FLUENT软件模拟分析高抽巷距回风巷不同平距、煤层顶板不同垂高条件下的瓦斯抽放效果,结果表明:在垂距为40 m的层位下,高抽巷距回风巷水平距离为30 m时,其所能抽采的瓦斯浓度最大,工作面上隅角瓦斯浓度为0.48%;在水平距为30 m的基准条件下,当高抽巷距离采空区底板垂直高度为40 m时,高抽巷抽采瓦斯浓度最大,抽采瓦斯纯量最高。从而确定了高抽巷的最佳位置为距离回风巷水平距离30 m,距离采空区顶板垂直距离40 m。

In order to determine the reasonable location of gas drainage from high drainage roadway, a methane migration model of goaf in 19201 working face is constructed. With the help of FLUENT software, the effect of gas drainage under different horizontal spacing and different roof height of high seam lane and return roadway is simulated and analyzed. The results show: when the vertical distance is 40 m, the horizontal distance between the high draw lane and the return air lane is 30 m. The gas concentration is the largest, and the upper corner gas concentration is 0.48%;under the standard condition of horizontal distance of 30 m, when the vertical height of the bottom floor of the goaf is 40 m, the gas concentration is maximum and the purity of gas extraction is the highest. It is determined that the best location of high drainage roadway is the horizontal distance 30 m of the distance air return lane, and the vertical distance from the roof of the goaf is 40 m.