高抽巷抽采负压优化的数值模拟

Numerical Simulation of Optimization for Drainage Negative Pressure of High Level Suction Roadway

基于山西某矿9101工作面的实际情况,利用Fluent模拟软件针对高抽巷不同抽采负压对采空区瓦斯分布规律的影响进行研究。结果表明:采空区在高抽巷不同抽采负压下均呈高瓦斯区域逐渐减小,低瓦斯区域逐渐增加的趋势,采空区内回风侧瓦斯浓度降低的速度比进风侧采空区大,且距离工作面越近,高抽巷瓦斯抽采的影响越明显;随着高抽巷抽采负压的增加,高抽巷抽采混量和抽采瓦斯纯量都逐渐增加,抽采负压超过12 k Pa后,抽采瓦斯纯量增速明显减小;抽采瓦斯浓度呈先增大后减小的趋势,当抽采负压为12 k Pa时存在1个峰值即14.25%,综合考虑高抽巷抽采瓦斯纯量和瓦斯浓度的变化,确定9101工作面高抽巷抽采负压为12 k Pa左右最合理。通过现场实测的采空区瓦斯浓度值与模拟值基本吻合,误差在工程允许的范围内。

Based on the actual situation of 9101 working surface of a mine in Shanxi Province, we use Fluent simulation software to study the effect of different drainage negative pressure of high level suction roadway on gas migration laws of gob. The results show that： gob area shows a tendency of gradually decreasing in high gas area and gradually increasing in low gas area under different drainage negative pressure in high level suction roadway, the gas concentration in the turn air in the goaf is lower than that in the wind side, and the closer the distance to the working face, the more obvious the influence of gas extraction; with the increase of drainage negative pressure in high level suction roadway, the mixing amount of the high suction roadway and the amount of gas extraction are gradually increasing. When the negative pressure is over 12 k Pa, the growth rate of extraction gas is obviously decreased; the concentration of extraction gas increases first and then decreases, there is a peak of 14.25% when the negative pressure is 12 k Pa. Comprehensively considering the change of gas purity and gas concentration in high extraction roadway, it is reasonable to confirm that the negative pressure of the 9101 working face is 12 k Pa. The gas concentration in the goaf is basically consistent with the simulated value, the error is within the allowable error range of the projec.