郭家山煤矿井下瓦斯的高位钻孔抽放系统优化实践

Optimization of Gas Drainage System with High-level Boreholes in Guojiashan Coal Mine

以山西蒲县宏源集团郭家山煤矿为例,通过更换瓦斯抽放泵、新增水闸分离器、调整上排终孔高度距工作面距离和上下排孔终孔与上隅角距离等措施,来优化高位钻孔瓦斯抽放系统,解决上隅角瓦斯超限的问题。结果表明:瓦斯抽放系统优化后,抽气量由90 m 3/min增加到235 m 3/min,抽放能力大大提高;钻孔布置优化后,管内瓦斯体积分数由2%增加至10%,上隅角瓦斯体积分数由1%降低至0.4%,采空区瓦斯抽放效果及上隅角瓦斯治理效果显著。

Taking Guojiashan Coal Mine in Puxian,Shanxi Province as an example,a series of measures have been taken to optimize the gas drainage system with high-level boreholes in order to solve the gas overrun in the upper corner.The measures include replacing gas drainage pump,adding a lock separator,and adjusting the distance between the borehole height of the upper row and the working surface as well as the distance between the boreholes of the upper and lower row and the upper corner.After the optimization of the gas drainage system,the gas extraction rate increased from 90 m 3/min to 235 m 3/min and the drainage capacity was greatly increased;after the optimization of the drilling layout,the gas concentration in pipes increased from 2%to 10%or so,and the upper corner gas concentration reduced from 1%to 0.4%.The gas drainage effect and treatment effect in the upper corner were significant.