供风量对采空区自燃动态影响及防灭火技术
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摘要
为有效防治采空区遗煤自燃,以瑞安矿014N1~(-1)综放工作面为研究对象,监测工作面供风量为1 150 m~3/min时的氧气浓度及漏风速度数据;基于采空区自燃"三带"划分标准和数值模拟方法,利用Comsol软件研究工作面不同供风量时采空区自燃带随回采时间的动态变化,确定稳定阶段自燃带的范围,得到工作面供风量与自燃带宽度的拟合曲线;提出构筑风流隔离墙与注氮相结合的防灭火技术。结果表明:随工作面供风量的增加,自燃带边界向采空区深部延伸,自燃带宽度也逐渐加大;在现有开采条件及推进速度下,工作面供风量应低于1 500 m~3/min;风流隔离墙与注氮相结合的防灭火技术,可使采空区自燃带宽度降至24. 6 m,防灭火效果较好。
In order to effectively prevent and control coal spontaneous combustion in goafs,studies were carried out with 014 N1~(-1) fully mechanized mining face of Ruian Mine as an object to acquire the data of oxygen concentration and air leakage speed under the condition where the actual air supply volume of the working face was 1 150 m~3/min. According to the " three zones" division standard of coal spontaneous combustion in goafs and numerical simulation method,the dynamic change of spontaneous combustion zones under different supply volumes of air was studied by using Comsol software,then the scope of spontaneous combustion zone was determined,and the fitting curve of the mining face's air supply volumes and width of the zone was obtained. Finally,the fire prevention and extinguishing technology,which combined air flow separation wall with nitrogen injection,was put forward. The results show that as the air supply volume raises,the boundary of the spontaneous combustion zone expands to the deep section of goafs and its width also increases gradually,and the air supply of working faces should be lower than1 500 m~3/min in view of the current mining conditions and heading speed. It is also found that the technology which features a combination of air flow separation wall and nitrogen injection can shrink the spontaneous combustion zone to a width of 24. 6 m,and it proves to have better effect in fire prevention and extinguishment.
In order to effectively prevent and control coal spontaneous combustion in goafs,studies were carried out with 014 N1~(-1) fully mechanized mining face of Ruian Mine as an object to acquire the data of oxygen concentration and air leakage speed under the condition where the actual air supply volume of the working face was 1 150 m~3/min. According to the " three zones" division standard of coal spontaneous combustion in goafs and numerical simulation method,the dynamic change of spontaneous combustion zones under different supply volumes of air was studied by using Comsol software,then the scope of spontaneous combustion zone was determined,and the fitting curve of the mining face's air supply volumes and width of the zone was obtained. Finally,the fire prevention and extinguishing technology,which combined air flow separation wall with nitrogen injection,was put forward. The results show that as the air supply volume raises,the boundary of the spontaneous combustion zone expands to the deep section of goafs and its width also increases gradually,and the air supply of working faces should be lower than1 500 m~3/min in view of the current mining conditions and heading speed. It is also found that the technology which features a combination of air flow separation wall and nitrogen injection can shrink the spontaneous combustion zone to a width of 24. 6 m,and it proves to have better effect in fire prevention and extinguishment.
引文
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[8]唐明云,戴广龙,秦汝祥,等.综采工作面采空区漏风规律数值模拟[J].中南大学学报:自然科学版,2012,43(4):1 494-1 498.TANG Mingyun,DAI Guanglong,QIN Ruxiang,et al.Numerical analysis of air-leakage law in goaf of fully mechanized face[J].Journal of Central South University:Science and Technology,2012,43(4):1 494-1 498.
[9]汪东.回采工作面配风量对采空区漏风及自燃影响分析[J].煤炭科学技术,2016,44(12):96-101.WANG Dong.Analysis on the effect of air quantity of coal mining face to air leakage and spontaneous combustion in goaf[J].Coal Science and Technology,2016,44(12):96-101.
[10]李宗翔.采空区遗煤自燃过程及其规律的数值模拟研究[J].中国安全科学学报,2005,15(6):15-19.LI Zongxiang.Numerical simulation of spontaneous combustion process of residual coal in goaf[J].China Safety Science Journal,2005,15(6):15-19.
[11]PAN Rongkun,CHENG Yuanping,YU Minggao,et al.New technological partition for“three zones”sponta-neous coal combustion in goaf[J].International Journal of Mining Science and Technology,2013,23:489-493.
[12]董强,周西华,李昂,等.低透自燃煤层综放采空区瓦斯与火共治方法研究[J].中国安全科学学报,2016,26(7):41-45.DONG Qiang,ZHOU Xihua,LI Ang,et al.A method for dealing with both gas and fire in low permeability and spontaneous combustion seam full-mechanized mine goaf[J].China Safety Science Journal,2016,26(7):41-45.
[13]赵宏,齐庆杰,孙占国,等.瑞安公司综采放顶煤综合防灭火技术和煤层瓦斯赋存情况及综合防治技术研究[R].阜新:辽宁工程技术大学,2016.
[2]贾宝山,汪伟,祁云,等.晋牛矿1 303综放面采空区注氮方案研究及数值模拟[J].中国安全生产科学技术,2018,14(3):82-88.JIA Baoshan,WANG Wei,QI Yun,et al.Research and numerical simulation on nitrogen injection scheme in goaf of1 303 fully mechanized caving face in Jinniu Mine[J].Journal of Safety Science and Technology,2018,14(3):82-88.
[3]李宗翔.采空区遗煤自燃过程及其规律的数值模拟研究[J].中国安全科学学报,2005,15(6):15-19.LI Zongxiang.Numerical simulation of spontaneous combustion process of residual coal in goaf[J].China Safety Science Journal,2005,15(6):15-19.
[4]周西华,白刚,李诚玉,等.天池矿102综放孤岛工作面控制风量防灭火技术研究[J].中国安全生产科学技术,2015,11(3):105-111.ZHOU Xihua,BAI Gang,LI Chengyu,et al.Study on fire prevention and control technology by controlling air volume on102 fully-mechanized isolated island caving face of Tianchi coal mine[J].Journal of Safety Science and Technology,2015,11(3):105-111.
[5]秦跃平,刘伟,杨小彬,等.基于非达西渗流的采空区自然发火数值模拟[J].煤炭学报,2012,37(7):1 177-1 183.QIN Yueping,LIU Wei,YANG Xiaobin,et al.Numerical simulation of impact of non-Darcy seepage on spontaneous combustion in goaf[J].Journal of China Coal Society,2012,37(7):1 177-1 183.
[6]余为,李强,黄伟,等.破碎岩体中的气体渗流规律研究[J].燕山大学学报,2007,31(4):317-321.YU Wei,LI Qiang,HUANG Wei,et al.Study on the laws of gas flow in over-broken rock mass[J].Journal of Yanshan University,2007,31(4):317-321.
[7]梁运涛,张腾飞,王树刚,等.采空区孔隙率非均质模型及其流场分布模拟[J].煤炭学报,2009,34(9):1 203-1 207.LIANG Yuntao,ZHANG Tengfei,WANG Shugang,et al.Heterogeneous model of porosity in gobs and its airflow field distribution[J].Journal of China Coal Society,2009,34(9):1 203-1 207.
[8]唐明云,戴广龙,秦汝祥,等.综采工作面采空区漏风规律数值模拟[J].中南大学学报:自然科学版,2012,43(4):1 494-1 498.TANG Mingyun,DAI Guanglong,QIN Ruxiang,et al.Numerical analysis of air-leakage law in goaf of fully mechanized face[J].Journal of Central South University:Science and Technology,2012,43(4):1 494-1 498.
[9]汪东.回采工作面配风量对采空区漏风及自燃影响分析[J].煤炭科学技术,2016,44(12):96-101.WANG Dong.Analysis on the effect of air quantity of coal mining face to air leakage and spontaneous combustion in goaf[J].Coal Science and Technology,2016,44(12):96-101.
[10]李宗翔.采空区遗煤自燃过程及其规律的数值模拟研究[J].中国安全科学学报,2005,15(6):15-19.LI Zongxiang.Numerical simulation of spontaneous combustion process of residual coal in goaf[J].China Safety Science Journal,2005,15(6):15-19.
[11]PAN Rongkun,CHENG Yuanping,YU Minggao,et al.New technological partition for“three zones”sponta-neous coal combustion in goaf[J].International Journal of Mining Science and Technology,2013,23:489-493.
[12]董强,周西华,李昂,等.低透自燃煤层综放采空区瓦斯与火共治方法研究[J].中国安全科学学报,2016,26(7):41-45.DONG Qiang,ZHOU Xihua,LI Ang,et al.A method for dealing with both gas and fire in low permeability and spontaneous combustion seam full-mechanized mine goaf[J].China Safety Science Journal,2016,26(7):41-45.
[13]赵宏,齐庆杰,孙占国,等.瑞安公司综采放顶煤综合防灭火技术和煤层瓦斯赋存情况及综合防治技术研究[R].阜新:辽宁工程技术大学,2016.
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