摘要
为治理保护层工作面的瓦斯,平煤股份四矿施工了大直径长距离高位钻孔,钻孔终孔直径193 mm,平均孔深100 m以上,抽采了采空区裂隙带的高浓度瓦斯,对高位钻场、钻孔参数进行了优化,并对钻孔封孔技术进行了改进。通过采取上述措施,高位钻场的抽放瓦斯体积分数增加到12%～30%,混合流量增加到25.68～45.70 m3/m in,纯流量增加到3.08～8.73 m3/m in,上隅角瓦斯体积分数下降到0.2%～0.6%,回风流瓦斯体积分数下降到0.2%～0.7%,保护层工作面月产原煤10万t以上,利用瓦斯日发电3.5万～3.8万kW.h,实现了煤与瓦斯共采。
In order to control the gas of the coal mining face in the protective seam,the long distance and large diameter boreholes at the high level was drilled by No.4 Mine of Pingdingshan Coal Mining Group Corporation limited.The completed diameter of the borehole was 193 mm,the average depth of the borehole was over 100 m and the boreholes were applied to drain the high density gas in the crack zone of the goaf.The paper in detail introduced the high level drilling site,borehole parameters optimization and improved borehole sealing technology.The results showed that with the above measures,the volume fraction of the gas drained from the high level drilling site was increased to 12%～30%,the combined gas flow value was increased to 25.68～45.70 m3/min,the pure flow value was increased to 3.08～8.73 m3/min,the gas volume fraction at the top corner was decreased to 0.2%～0.6%,the gas volume fraction in the air return gateway was decreased to 0.2%～0.7%,the coal production per month of the coal mining face in protective seam would be over 100 000 t,the gas-fired power generation would be 35 000～38 000 kW·h and the coal and gas could be mined at the same time.
出处
《煤炭科学技术》
CAS
北大核心
2010年第8期63-65,69,共4页
Coal Science and Technology
关键词
高位钻孔
保护层工作面
瓦斯抽采
参数优化
high level borehole
coal mining face in protected seam
gas drainage
parameter optimization
