不同风速下采空区瓦斯分布及抽采技术研究

Study on Gas Distribution and Drainage Technology in Goaf under Different Wind Speeds

为了解决采空区漏风,遗煤容易发生自燃,瓦斯超限的问题,采用理论分析、数值模拟、现场实验的方法对某矿采空区不同深度瓦斯分布规律及不同风速瓦斯浓度变化进行数值模拟。研究结果表明:在走向方向,距离进风口越远瓦斯浓度逐渐增大,进风口浓度几乎为0,而在采空区深部约250 m位置,瓦斯浓度可达80%左右;随着采空区深度增加,瓦斯浓度呈曲线式变化,同一标高下,采空区越深,瓦斯浓度越高;在采空区相同的位置,风速增大时可以减少工作面瓦斯浓度;确定出上隅角瓦斯抽采管路布置在距离顶板2.6 m附近,当深度达到15 m时上隅角浓度降至1.2%.

In order to solve the tion, and of gas problem of air leakage into limitation. The theoretical goal, of left coal being prone to spontaneous combus- analysis, numerical simulation and field experiment are used to analyze the gas distribution law at different depths of a mine and the variation of gas concentration at different wind speeds. The results show that in the direction of the strike, the gas concentration increases gradually from the inlet off the airway where the concentration is near zero. While the gas concentration can reach to 80% at 250 m away in goal. As the depth increases, the gas concentration changes in a curve. Under the same elevation, the deeper the goal is, the higher the gas concentration is. In the same position of the goal, when the air speed increases, the gas concentration of the working face can be reduced ; it is determined that if the drainage pipeline is placed 2.6 m below the roof with the depth reaches 15 m, the upper corner gas concentration drops to 1.2%.