综放开采工作面回风隅角瓦斯治理技术研究

Study on Gas Control Technology in Return Air Corner of Fully Mechanized Top Coal Caving Face

在对采面回风隅角瓦斯集聚原因分析基础上,发现采空区以及裂隙瓦斯是导致回风隅角瓦斯浓度偏高的主要原因。为此,针对性提出采用大直径钻孔对采空区瓦斯进行抽采、高位钻孔拦截裂隙瓦斯,现场应用后,大直径钻孔、高位钻孔瓦斯抽采纯量稳定在7.242 m^(3)/min、1.35 m^(3)/min,可明显降低采空区及裂隙瓦斯向回风隅角涌出,同时后续回采过程中回风隅角瓦斯浓度均控制在0.5%以内,瓦斯治理取得显著效果。

Based on the analysis of the causes of gas concentration in the return air corner of the mining face, it is found that the goaf and fissure gas are the main reasons for the high gas concentration in the return air corner. Therefore, it is proposed to adopt large-diameter boreholes to extract gas from goaf and high-level boreholes to intercept fissure gas. After field application, the net amount of gas extraction from large-diameter boreholes and high-level boreholes is stable at 7.242 m^(3)/min and 1.35 m^(3)/min, which can significantly reduce the emission of goaf and fissure gas to the return air corner. At the same time, the gas concentration in the return air corner in the subsequent mining process is controlled within 0.5%, and remarkable results have been achieved in gas control.