双U型通风工作面瓦斯浓度分布规律研究

Research of distribution law of gas concentration of double U-shape ventilation working face

为了掌握双U型通风工作面瓦斯浓度分布规律,预防工作面瓦斯浓度超限,运用Fluent软件对某工作面推进到2个联络巷之间不同位置时采空区内漏风进行了模拟分析,并对工作面瓦斯涌出规律进行了实测和统计研究分析。模拟与观测结果表明,双U型通风工作面在推进过程中,工作面刮板输送机后部、上隅角和回风巷后部瓦斯浓度变化不大,尾巷瓦斯浓度随着工作面在2个联络巷之间位置的改变而变化,联络巷打开时,瓦斯浓度最大,当工作面距离打开联络巷23m左右时瓦斯浓度最小,当工作面距离打开联络巷40m时尾巷瓦斯浓度又增加到初期最大值,且进一步增大。因此,从治理瓦斯角度考虑,回风巷和瓦斯排放巷之间的联络巷合理间距应为40m,考虑经济性,建议不要超过50m。

In order to grasp distribution law of gas concentration of double U-shape ventilation and prevent gas exceeding problem,the paper simulated and analyzed air leakage of goaf at different positions between two crossheadings using Fluent software.It also measured and researched gas emission law on working face.The results of simulation and observation show that changes of the gas concentration of the rear scraper conveyor of the working face,the upper concern and rear return airway are small in the process of advancing the working face;the gas concentrations of tailing way have a big change with the change of position of the working face between the two crossheadings.The gas concentration of the tailing way will be the maximum when the crossheadings are opened,it reaches the minimum when the distance between working face and the opened crossheading is 23meters,reaches the maximum when the distance is40meters,and further increase with the distance increasing.Therefore,the reasonable distance of the crossheadings between return airway and gas drainage way is 40 meters from the perspective of gas controlling,and the distance should be no larger than 50meters from the economic perspecitve.