上隅角不同插管深度瓦斯抽采效果研究

Research on Gas Drainage Effect with Different Depth of Cannula in Upper Corner

为研究上隅角插管深度对瓦斯抽采的影响,以党家河煤矿104工作面为背景建立数值模拟模型,使用FLUENT数值模拟软件对抽采前及插管深度为1、3、5 m时工作面及采空区瓦斯浓度分布进行数值模拟;数值模拟结果表明:上隅角插管深度越深,上隅角瓦斯浓度越低,但对除上隅角以外的工作面和采空区其它地方的瓦斯分布影响不大。将研究结果应用于现场实践,实测104工作面上隅角瓦斯浓度不超过0.7%。研究结果表明上隅角插管抽采瓦斯可以有效抽采上隅角瓦斯,降低上隅角瓦斯浓度。

In order to study the effect of different depth of cannula in upper corner on gas drainage, FLUENT is used to simulate the gas distribution of working face and goaf without gas drainage and under the condition of 1 m, 3 m, 5 m cannula depth at the background of 104 working face in Dangjiahe Coal Mine. Numerical simulation results show that the deeper of the cannula is, the lower gas concentration of the upper corner is. But the gas drainage of cannula can hardly influence the gas distribution of the other area except for the upper corner. Apply the research results into practice, measured data show that gas concentration of the upper corner of 104 working face is lower than 0.7%. Study shows that gas drainage of cannula can extract gas of upper corner effectively, the gas concentration of upper corner is effectively controlled at the same time.