不同通风方式下顶板高位定向钻孔瓦斯抽放效果研究  

Gas drainage effect of high-level directional drilling in roof under different ventilation modes

作　　者：张志敏 Zhang Zhimin(Nanwasi Coal Industry Co.,Ltd.,Shanxi Qinhe Energy Group,Jincheng 048000,China)

机构地区：[1]山西沁和能源集团南凹寺煤业有限公司,山西晋城048000

出　　处：《煤炭与化工》2021年第11期107-110,113,共5页Coal and Chemical Industry

摘　　要：顶板高位定向钻孔配合上隅角埋管抽放是解决综采工作面采空区瓦斯聚积、回风流瓦斯浓度高的主要手段,顶板高位定向钻孔抽放采空区聚积瓦斯期间,工作面不同通风方式对钻孔的抽放量影响差异较大。通过对常村煤矿W3309综采工作面在2种不同通风方式下的顶板高位定向钻孔抽放量进行监测,结果表明,采用两进一回前置回风比三进一回后置回风顶板高位定向钻孔抽放量高10 m^(3)/min以上,工作面回风流瓦斯浓度下降0.23%,两进一回前置回风较三进一回后置回风更有利于顶板高位定向钻孔抽放,综采工作面瓦斯治理效果明显。同时,通过分析三进一回后置回风通风方式对抽放效果的不利影响因素,并对高位抽放钻孔进行优化,有效解决三进一回后置回风通风方式下瓦斯抽放浓度低、工作面回风流瓦斯浓度偏高问题。Roof high-level directional drilling combined with upper corner buried pipe drainage is the main means to solve the gas accumulation in goaf of fully mechanized mining face and the high concentration of return air flow gas.During the period of roof high-level directional drilling drainage of goaf gas accumulation,the influence of different ventilation methods on drilling drainage is different.Through monitoring the drainage amount of high-level directional drilling in the roof of W3309 fully mechanized working face in Changcun Coal Mine under two different ventilation modes,the results show that the drainage amount of high-level directional drilling in the roof with two-in-one-return pre-return is more than 10 m^(3)/min higher than that with three-in-one-return post-return,and the gas concentration in the return air flow of the working face decreases by 0.23%.The two-in-one-return pre-return is more conducive to the drainage of high-level directional drilling in the roof than the three-in-one-return post-return,and the gas control effect of the fully mechanized working face is obvious.At the same time,by analyzing the adverse factors of the three-in-one-loop rear return air ventilation mode on the drainage effect,and optimizing the high-level drainage borehole,the low gas drainage concentration and the high gas concentration of the return air flow in the working face under the three-in-one-loop rear return air ventilation mode are effectively solved.

关 键 词：综采工作面 顶板高位定向钻孔 通风方式 抽放效果 

分 类 号：TD712[矿业工程—矿井通风与安全]