易自燃煤层上隅角瓦斯抽采方法的选取
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摘要
针对回采工作面"偏Y"型改为"U"型通风方式下上隅角瓦斯超限的问题,进行了"U"型通风改造后上隅角瓦斯超限的原因分析,利用ANSYS-FLUENT数值模拟软件,构建了采空区遗煤瓦斯渗流的数学模型,定量对比研究了走向高抽巷抽采和邻近巷插管抽采2种抽采方法下采空区瓦斯浓度分布和"三带"宽度变化,确定了走向高抽巷抽采能够有效的减少采空区瓦斯涌入上隅角,控制采空区自燃带的宽度,并对其实际应用效果进行了考察。结果表明:采用走向高抽巷抽采方法后,抽采的卸压瓦斯纯量达100 m~3/min之多,抽采率也达90%以上,上隅角瓦斯浓度处于0.8%以下,采空区无自然发火征兆,有效的减少了上隅角瓦斯超限和采空区火灾发生的风险,为回采工作面的安全生产提供了技术支持。
According to the gas overrun problem of upper corner in working face "partial Y"to "U"type ventilation mode, the causes of gas overrun in upper corner after the transformation of the"U"type ventilation is analyzed, with ANSYS-FLUENT simulation software, the mathematical model of residual coal gas seepage in goaf is established, the gas concentration distribution in goaf and variation of"three zones"width by quantitative comparative study of two extraction methods of trend high suction lane extraction and the adjacent lane piping extraction. It is determined that the gas flow in the goaf can be effectively reduced and the width of the spontaneous combustion zone in goaf is controlled, and the practical application effect is also investigated. The results show that the trend high level suction roadway extraction method, the extracted pressure relief gas purity is more than 100 m~3/min,the extracting rate is above 90%, the gas concentration of upper corner is below 0.8% without the signs of spontaneous combustion in goaf, which effectively reduces gas overrun problem at the upper corner and fire risk and provides technical support for safety production of working face.
According to the gas overrun problem of upper corner in working face "partial Y"to "U"type ventilation mode, the causes of gas overrun in upper corner after the transformation of the"U"type ventilation is analyzed, with ANSYS-FLUENT simulation software, the mathematical model of residual coal gas seepage in goaf is established, the gas concentration distribution in goaf and variation of"three zones"width by quantitative comparative study of two extraction methods of trend high suction lane extraction and the adjacent lane piping extraction. It is determined that the gas flow in the goaf can be effectively reduced and the width of the spontaneous combustion zone in goaf is controlled, and the practical application effect is also investigated. The results show that the trend high level suction roadway extraction method, the extracted pressure relief gas purity is more than 100 m~3/min,the extracting rate is above 90%, the gas concentration of upper corner is below 0.8% without the signs of spontaneous combustion in goaf, which effectively reduces gas overrun problem at the upper corner and fire risk and provides technical support for safety production of working face.
引文
[1]周爱桃,王凯,臧杰,等.易自燃采空区瓦斯与火灾共治数值模拟[J].中国安全科学学报,2010,20(8):49.
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[7]朱光丽,赵文彬,张守勇,等.基于数值模拟的1307工作面“三带”分布规律预测研究[J].煤炭工程,2015,47(1):92-94.
[8]卢平,方良才,童云飞,等.深井煤层群首采层Y型通风工作面采空区卸压瓦斯抽采与综合治理研究[J].采矿与安全工程学报,2013,30(3):456-462.
[9]李英明,杨明东,付永刚.U型工作面上隅角埋管瓦斯抽采数值模拟研究[J].中国安全生产科学技术,2013,9(12):17-22.
[10]时国庆,王德明,奚志林.基于FLUENT对采空区氧气浓度场的数值模拟[J].煤炭科学技术,2009,37(6):76-79.
[11]钱鸣高,许家林.覆岩采动裂隙分布的“O”形圈特征研究[J].煤炭学报,1998,23(5):466-469.
[12]郭建行,鲁义.高位钻孔抽放对采空区瓦斯与火灾防治效果分析[J].现代矿业,2012,28(11):127-129.
[13]李亚伟,罗新荣,唐冠楚.高瓦斯综采工作面立体抽采模式的数值模拟优化[J].煤炭科学技术,2016,44(S2):124-129.
[14]吴兵,雷柏伟,华民国,等.回采工作面上隅角瓦斯拖管抽采技术参数研究[J].采矿与安全工程学报,2014,31(2):315-321.
[15]刘彦青,许兴林,孙依沛,等.工作面推进度对采空区遗煤瓦斯涌出的影响研究[J].煤炭科学技术,2016,44(S2):134-137.
[16]陈延可,戴广龙,汪大全,等.上保护层开采卸压瓦斯治理技术研究[J].煤炭科学技术,2013,41(3):77.
[2]张浪,范喜生,蔡昌宜,等.U型通风上隅角瓦斯浓度超限治理理论与模拟[J].煤炭科学技术,2013,41(8):129-132.
[3]周爱桃,李志磊,杜锋,等.采空区埋管抽放治理上隅角瓦斯技术研究[J].煤炭技术,2015,34(2):114.
[4]赵建安,李峰云,詹智伟.易自燃特厚煤层高瓦斯工作面瓦斯治理技术[J].煤矿安全,2015,46(3):119.
[5]刘伟,秦跃平,郝永江,等.“Y”型通风下采空区自然发火数值模拟[J].辽宁工程技术大学学报(自然科学版),2013,32(7):874-879.
[6]郭建行.高瓦斯易自燃煤层采空区抽采瓦斯方法对比分析[J].煤矿安全,2017,48(11):167-170.
[7]朱光丽,赵文彬,张守勇,等.基于数值模拟的1307工作面“三带”分布规律预测研究[J].煤炭工程,2015,47(1):92-94.
[8]卢平,方良才,童云飞,等.深井煤层群首采层Y型通风工作面采空区卸压瓦斯抽采与综合治理研究[J].采矿与安全工程学报,2013,30(3):456-462.
[9]李英明,杨明东,付永刚.U型工作面上隅角埋管瓦斯抽采数值模拟研究[J].中国安全生产科学技术,2013,9(12):17-22.
[10]时国庆,王德明,奚志林.基于FLUENT对采空区氧气浓度场的数值模拟[J].煤炭科学技术,2009,37(6):76-79.
[11]钱鸣高,许家林.覆岩采动裂隙分布的“O”形圈特征研究[J].煤炭学报,1998,23(5):466-469.
[12]郭建行,鲁义.高位钻孔抽放对采空区瓦斯与火灾防治效果分析[J].现代矿业,2012,28(11):127-129.
[13]李亚伟,罗新荣,唐冠楚.高瓦斯综采工作面立体抽采模式的数值模拟优化[J].煤炭科学技术,2016,44(S2):124-129.
[14]吴兵,雷柏伟,华民国,等.回采工作面上隅角瓦斯拖管抽采技术参数研究[J].采矿与安全工程学报,2014,31(2):315-321.
[15]刘彦青,许兴林,孙依沛,等.工作面推进度对采空区遗煤瓦斯涌出的影响研究[J].煤炭科学技术,2016,44(S2):134-137.
[16]陈延可,戴广龙,汪大全,等.上保护层开采卸压瓦斯治理技术研究[J].煤炭科学技术,2013,41(3):77.