摘要
为了减少厚煤层掘进工作面的煤壁瓦斯涌出量,降低巷道回风流瓦斯浓度,提出采用“钻墙”的方法截流厚煤层掘进期间的煤壁瓦斯涌出量。以毛家庄煤矿为研究对象,通过研究抽采负压的作用下,钻孔初始瓦斯涌出量和钻孔瓦斯流量衰减系数的变化规律,确定抽采负压对钻孔抽采流量的影响,以此作为“钻墙”参数设计的科学依据。研究结果表明:在恒定抽采负压影响下,抽采负压加快煤体瓦斯源涌向钻孔,钻孔初始瓦斯涌出量明显增大,钻孔瓦斯流量衰减速率也随之加快。在考虑煤壁瓦斯涌出量、煤层厚度、煤层有效抽采半径和单孔瓦斯抽采能力的基础上对钻孔的组合数量进行优化,8201工作面施工“钻墙”以来,风排瓦斯量最大为0.85 m3/min,回风流瓦斯浓度最大为0.11%;同比施工“钻墙”前的风排瓦斯量减少了4.19 m3/min,回风流瓦斯浓度减少了0.49个百分点。
In order to reduce the gas emission from the wall of thick coal seam driving face and reduce the gas concentration of return air flow in roadway,the method of"borehole wall"is proposed to intercept the gas emission from the wall of thick coal seam during driving.Taking Maojiazhuang coal mine as the research object,through studying the variation law of initial gas emission and attenuation coefficient of gas flow in borehole under the effect of negative pressure of drainage and extraction,the influence of negative pressure of drainage and extraction on drainage and extraction flow in borehole is determined,as a scientific basis for parameter design of"borehole wall".The results show that under the influence of constant negative pressure of gas drainage,the negative pressure of gas drainage accelerates the gas source from coal to borehole,the initial gas emission from borehole increases obviously,and the gas flow attenuation rate of borehole increases accordingly.Based on the consideration of gas emission from coal wall,thickness of coal seam,effective drainage radius of coal seam and single conhuas drainage capacity,the combination number of boreholes is optimized,the maximum amount of air exhaust gas is 0.85 m3/min,the maximum concentration of return air flow gas is 0.11%,and the amount of air exhaust gas is 4.19 m3/min less and the concentration of return air flow gas is 0.49 percent less than that before borehole wall.
作者
李润芝
LI Runzhi(China Coal Technology and Engineering Group Shenyang Research lnstitute,Fushun 113122,China;State Key Laboratory of Coal Mine Safety Technology,Fushun 113122,China)
出处
《煤炭技术》
CAS
北大核心
2023年第11期124-127,共4页
Coal Technology
基金
国家自然科学基金资助(51774165)。
关键词
煤壁瓦斯涌出量
掘进工作面
钻墙
单孔瓦斯抽采能力
gas emission from coal wall
driving face
borehole wall
single borehole gas drainage capacity
