薄煤层工作面上隅角瓦斯治理实践

Gas Control on Upper Corner of Thin-seam Working Face

针对寺河煤矿二号井94311工作面回采过程中出现上隅角瓦斯浓度频繁超限的问题,采取相应措施对工作面通风系统进行了优化,并结合高位顶板钻孔对临近层采空区瓦斯进行抽采,将原有的"一进两回"通风方式调整为"两进一回"通风方式,调整后,工作面进风量由1120m3/min增大至2040m3/min,回风量平均值由960m3/min增大至1920m3/min,工作面上隅角瓦斯浓度得到了较好控制,监测期间无上隅角瓦斯浓度超限现象发生。

Aiming at the gas concentration overrun on the upper corner at 94311 working face of No. 2 Shaft of Si- he Colliery,the author presents the measures of optimizing the ventilation system by gas drainage in goal of adja- cent layer with high--level roof drilling, changing the original ＂one entry and two returns＂ ventilation mode into ＂two entries and one return＂ one, which increases the air intake from 1120 m3/min to 2040 m3/min, the average air return from 960 m3/min to 1920 m3/min,and control the gas concentration on upper corner without overrun in the period of monitoring.