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综放工作面瓦斯综合抽采治理技术

Comprehensive Gas Drainage Control Technologies in Fully-Mechanized Top Coal Caving Mining Face

  • 摘要: 针对保德煤矿随着开采深度不断加大,煤层瓦斯含量逐步增加的问题,建立了深部煤层瓦斯综合抽采治理模式。回采工作面采用本煤层顺层钻孔和千米钻孔相结合的瓦斯抽采方法,掘进工作面采用母巷羽翼超前预抽方法,采空区采用在联络巷埋管抽采瓦斯的方法。结果表明:采用上述瓦斯综合抽采治理技术后,采煤工作面瓦斯抽采浓度和预抽率均在10%以上,残余瓦斯含量控制在4.5m3/t以下;掘进工作面残余瓦斯含量降低至4.5 m3/t以下,残余瓦斯压力均降低至0.2 MPa以下,且掘进期间工作面和回风流中最高瓦斯浓度均在0.3%以下;采用联络巷埋管抽取采空区瓦斯后,工作面上隅角瓦斯浓度由之前平均0.6%降低到0.3%以下,最大抽采瓦斯纯量13.60 m3/min,最高瓦斯浓度40%。通过瓦斯综合抽采技术,有效降低了工作面瓦斯浓度,有效保障了工作面安全高效回采。

     

    Abstract: According to the problems of mining depth continuously increased and seam gas content steadily increased in Baode Mine, the gas comprehensive contr ol mode of deep seam was established. A gas drainage method combined with a borehole along mining seam and 1 000 m borehole was applied to coal mining face, a gas pre- drainage method of a mather gateway and assistant gateways was applied to the gateway driving face, and a gas drainage method with pipeline buried in the C onnection gateways was applied to the mining goaf. The results showed that after above gas comprehensive drainage and control technologies applied, the gas drainag e concentration of the coal mining face and the pre- drainage rate were all over 10% and residual gas content was controlled below 4.5 m3/ t. The residual gas content of driving face was reduced below 4.5 m3/ t, a residual gas pressure was all reduced below 0.2 MPa and the max gas content in the driving face and in the air retuning flow was all below 0.3%. After the goaf gas were drained with the pipe buried in the connection gateway, a gas content at the upper corner of the coal mining face was reduced from previous 0. 6% in average to below 0. 3%. After a gas drainage pipe applied to the goaf, the max drained gas net quantity was 13. 60 m3/ min. The highes t gas concentration was 40%. The gas comprehensive drainage technology applied could effectively reduce the gas content of coal mining face and could effectively en sure the safety and high efficient mining.

     

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