低含量超强开采工作面瓦斯异常涌出防治技术

发布时间：2018-04-05 05:01

本文选题：低瓦斯含量　切入点：超高强度开采　出处：《中国安全科学学报》2017年01期

【摘要】：为解决低瓦斯含量煤层在超高强度开采工艺下,U型通风回采面割煤期间瓦斯涌出量突增、采空区持续高瓦斯涌出以及上隅角瓦斯频繁超限等问题,在确认瓦斯异常涌出原因基础上,以塔山煤矿为例,研究煤层注水抑制落煤瓦斯涌出和专用巷分期排抽采空区瓦斯联合防治技术。结果表明,煤层注水消除了割煤期间瓦斯突增现象——回风流中最大瓦斯体积分数仅0.58%;在开采初期瓦斯专用巷自然引排使回采面形成U+I型通风方式,分担风排瓦斯量约30 m~3/min,在开采中、后期的密闭负压抽采,瓦斯排放量提升至40 m~3/min。采用该技术,已将回采期间的工作面瓦斯体积分数有效控制在0.6%以下,实现安全高效开采。
[Abstract]:In order to solve the problems of increasing gas emission during cutting coal face of U-type ventilation coal seam with low gas content under ultra-high intensity mining technology, continuous high gas emission in goaf and frequent overrun of gas in upper corner, etc.On the basis of confirming the cause of abnormal gas emission, taking Tashan coal mine as an example, the combined prevention and control technology of coal seam water injection to restrain gas emission from falling coal and special roadway to drain gas from goaf by stages is studied.The results show that the phenomenon of gas explosion during coal cutting is eliminated by water injection in coal seams, the maximum gas volume fraction in the return air flow is only 0.58, and in the early stage of mining, the natural drawing and drainage of special gas roadway make the mining face form U-type ventilation mode.Share the amount of gas out of the air about 30 mm2 / min, in mining, the later stage of closed negative pressure drainage, gas discharge increased to 40 mV3 / min.By using this technology, the gas volume fraction in the face during the mining period has been effectively controlled below 0.6%, and the safe and efficient mining has been realized.
【作者单位】：河南理工大学安全科学与工程学院;煤矿安全技术国家重点实验室;煤科集团沈阳研究院有限公司;
【基金】：国家“十三五”大型油气田及煤层气开发科技重大专项项目(2016ZX05045-004-001)
【分类号】：TD712

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