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。
In order to solve the problems of sudden increase in gas emission during coal cutting,the amount of gas emission continues to increase in goaf,and gas exceeding seriously at the upper corner under ＂ U＂ type ventilation in the working face for coal seam poor in gas under extremely intensive mining condition. Tashan coal mine was taken as an example,and experiments were carried out to study the inhibition effect of coal seam water injection on gas emission during the fall of coal. A combined control technique for tnm-staging evacuation in the dedicated gas roadway of goaf was developed. The results show that the sudden increase of gas emission can be controlled by using the technology of coal seam water injection during mining,that the maximum volume fraction of gas in return air can be lowered to 0. 58%,that U ＋ I-type ventilation of natural evacuation is established during incipient mining in dedicated gas roadway,and the share of windblown gas reaches 30 m^3/ min,and that the gas emission is raised to 40 m^3/ min through inclosed vacuum drainage during the middle and later periods of mining.The technology controlled gas density of working face under critical value 0.6% during mining time,which protected mining face with high efficiency and safety.
作者
王春光
WANG Chunguang(School of Safety Science ＆ Engineering, Henan Polytechnic University, Jiaozuo Henan 454000, China State Key Laboratory of Coal Mine Safety Technology, Fushun Liaoning 113122, China Shenyang Research Institute, China Coal Technology ＆ Engineering Group Fushun Liaoning 113122, China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2017年第1期71-76,共6页
China Safety Science Journal
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)
关键词
低瓦斯含量
超高强度开采
煤层注水
瓦斯专用巷
密闭抽采
low content
ultrahigh strength
water injection technology for coal seam
gas roadway
closed drain
