摘要
30702采煤工作面顶底板存在有瓦斯含量较高的2号、7号、9号、11号、12号等可采煤层以及部分不可采煤层,采面回采后邻近层大量卸压瓦斯会沿着采动裂隙向回采空间涌入,从而导致回风巷及回风隅角位置瓦斯浓度偏高,出现瓦斯超限风险。结合现场条件,提出综合采用本煤层钻孔、高位裂隙钻孔、采空区埋管抽采以及邻近层底板瓦斯抽采等方式抽采瓦斯,减少本煤层、采空区以及邻近层瓦斯涌出量,同时通过适当增大瓦斯抽采负压、提高封孔质量等方式提高抽采效果。现场应用后30702采煤工作面采用的瓦斯治理方式瓦斯抽采量总量达到瓦斯涌出量的74.5 m^(3)/min,回风巷及回风隅角位置瓦斯浓度均在安全范围内,瓦斯治理效果显著。
There are high gas content minable coal seams such as No.2,No.7,No.9,No.11,and No.12,as well as some non minable coal seams on the top and bottom of the 30702 coal mining face.After the mining face is mined,a large amount of pressure relief gas from adjacent layers will flow into the mining space along the mining cracks,resulting in high gas concentration in the return air roadway and return air corner positions,posing a risk of gas exceeding the limit.Based on the on-site conditions,it is proposed to comprehensively adopt methods such as drilling in the coal seam,drilling in high level fractures,burying pipes in goaf,and gas extraction from adjacent layer floor to reduce the gas emission from the coal seam,goaf,and adjacent layers.At the same time,the gas extraction effect is improved by appropriately increasing the negative pressure of gas extraction and improving the sealing quality.After on-site application,the gas control method adopted in the 30702 coal mining face achieved a total gas extraction amount of 74.5 m^(3)/min of the gas emission amount.The gas concentration in the return air roadway and return air corner positions was within the safe range,and the gas control effect was significant.
作者
高云
Gao Yun(Mining and Construction Branch of Shanxi Lu'an Chemical Engineering Group Engineering Co.,Ltd.,Tunliu Shanxi 046100,China)
出处
《山西冶金》
CAS
2023年第10期230-232,共3页
Shanxi Metallurgy
关键词
煤层群开采
瓦斯治理
卸压瓦斯
穿层钻孔
coal seam group mining
gas control
pressure relief gas
layer drilling
作者简介
高云(1976-),男,山西黎城人,本科,毕业于太原科技大学电气工程及其自动化专业,工程师,从事煤矿瓦斯抽采及巷道掘进工程技术研究工作。