风速对近距离煤层采空区漏风及煤自燃影响研究
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摘要
为研究进风巷风速变化条件下近距离煤层采空区漏风强度及煤自燃规律,基于采空区"横三区"、"竖三带"理论,以某矿综采工作面为原型建立了U型通风近距离煤层采空区三维模型,运用Fluent软件对进风巷不同风速下采空区的流场状态进行模拟计算,根据模拟结果对采空区自燃三带进行划分;利用面积计算软件和Origin数值分析软件,分析计算得到进风巷不同风速条件下的采空区氧化带面积变化曲线,并推导出不同风速下采空区高度所对应的煤自燃氧化带面积的计算公式。研究结果表明:采空区漏风区域主要集中在至工作面进风端起水平距离0～23 m,采空区漏风过程中,上覆采空区煤自燃危险性大于下伏采空区煤自燃危险性;当进风巷风速一定时,采空区氧化带面积与其高度成正比,当采空区高度一定时,在风速为3 m/s条件下,采空区氧化带面积达到最大值;不同风速情况下,采空区氧化带面积与其对应高度成正比;在实际应用时,应结合采空区具体情况合理控制进风巷风速,加强采空区内气体的实时监测及煤自燃预测技术手段,提高矿井开采作业安全性。
This paper studies the distributions of air leakage and coal spontaneous combustion in gob of contiguous seams under different intake air velocities.Based on the theory of"three horizontal zones"and"three vertical zones",a three dimensional model of a U type ventilation contiguous seams gob was established to simulate a real mine working face.Numerical simulation was conducted in Fluent to study the airflow in gob under different intake air velocities.The three zones of spontaneous combustion in gob were determined according to the simulation results.Using area calculation software and Origin numerical analysis,the area changes of gob oxidized zone under different intake air velocities were illustrated and a mathematical model was developed to calculate the area of coal spontaneous combustion zone.The results show that the air leakage in gob was concentrated in the area which has a horizontal distance between 0 and 23 m from the inlet of working face.Due to air leaking into gob,the risk of coal spontaneous combustion in overlying gob was greater than that of mined out area.The results also show that the area of oxidized zone in gob was proportional to the height of gob when the air velocity is constant and the area of oxidized zone reaches the maximum value when the velocity is 3 m/s and the height of gob is constant.Moreover,the area of oxidation zone in gob is proportional to the height of gob under different air velocities.The results suggest that,to improve mine safety,the determination of air velocity should take into consideration of gob conditions,the real-time gas monitoring in gob should be implemented,and coal spontaneous combustion prediction technology should be improved.
This paper studies the distributions of air leakage and coal spontaneous combustion in gob of contiguous seams under different intake air velocities.Based on the theory of"three horizontal zones"and"three vertical zones",a three dimensional model of a U type ventilation contiguous seams gob was established to simulate a real mine working face.Numerical simulation was conducted in Fluent to study the airflow in gob under different intake air velocities.The three zones of spontaneous combustion in gob were determined according to the simulation results.Using area calculation software and Origin numerical analysis,the area changes of gob oxidized zone under different intake air velocities were illustrated and a mathematical model was developed to calculate the area of coal spontaneous combustion zone.The results show that the air leakage in gob was concentrated in the area which has a horizontal distance between 0 and 23 m from the inlet of working face.Due to air leaking into gob,the risk of coal spontaneous combustion in overlying gob was greater than that of mined out area.The results also show that the area of oxidized zone in gob was proportional to the height of gob when the air velocity is constant and the area of oxidized zone reaches the maximum value when the velocity is 3 m/s and the height of gob is constant.Moreover,the area of oxidation zone in gob is proportional to the height of gob under different air velocities.The results suggest that,to improve mine safety,the determination of air velocity should take into consideration of gob conditions,the real-time gas monitoring in gob should be implemented,and coal spontaneous combustion prediction technology should be improved.
引文
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[13]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 andspontaneous combustion in goaf[J].CoalScience and Technology,2016,44(12):96-101.
[14]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):1494-1498.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:Natural Science Edition,2012,43(4):1494-1498.
[15]秦波涛,鲁义,殷少举,等.近距离煤层综放面瓦斯与煤自燃复合灾害防治技术研究[J].采矿与安全工程学报,2013,30(2):311-316.QIN Botao,LU Yi,YIN Shaoju,et al.Prevention and control technique of complex disaster caused by gas andspontaneous combustion for fully mechanized sublevel caving face in close-distance seams[J].Journal of Mining&Safety Engineering,2013,30(2):311-316.
[16]杨胜强,秦毅,孙家伟,等.高瓦斯易自燃煤层瓦斯与自燃复合致灾机理研究[J].煤炭学报,2014,39(6):1094-1101.YANG Shengqiang,QIN Yi,SUN Jiawei,et al. Research on coupling hazard mechanism of mine gas and coal fire for agassy and high spontaneous combustion propensity coal seam[J]. Journal of China Coal Society,2014,39(6):1094-1101.
[17] DENG J,LEI C K,XIAO Y,et al.Determination and prediction on“three zones”of coal spontaneous combustion in a gob of fully mechanized caving face[J].Fuel,2018,211:458-470.
[18]吴根水,余伟健,王平,等.基于逾渗机理的含瓦斯煤体变形破坏机制及试验研究[J].煤炭学报,2018,43(3):724-734.WU Genshui,YU Weijian,WANG Ping,et al.Deformation failure mechanism and experimental study of gas-bearing coal rock mass basedon percolation mechanism[J]. Journal of China Coal Society,2018,43(3):724-734.
[19]黄戈,张勋,王继仁,等.近距离煤层上覆采空区自燃形成机理及防控技术[J].煤炭科学技术,2018,46(8):107-113.HUANG Ge,ZHANG Xun,WANG Jiren,et al. Ormationmechanism and prevention technology of spontaneous combustion occurred in overburden goaf in contiguous seams[J]. Coal Science and Technology,2018,46(8):107-113.
[20] XIE Z H,CAI J,ZHANG Y.Division of spontaneous combustion“three-zone”in goaf of fully mechanizd coal face with big dipand hard roof[C]//2012 internat-ional symposium on safety scienceand engineering in China.Procedia Engineering,2012:82-87.
[21]王刚,王锐,武猛猛,等.火区下近距离煤层开采有害气体入侵灾害防控技术[J].煤炭学报,2017,42(7):1765-1775.WANG Gang,WANG Rui,WU Mengmeng,et al. Prevention and control technology of harmful gas intrusion in closeup coal seam under fire area[J].Journal of China Coal Society,2017,42(7):1765-1775.
[22] WEI Lianjiang.Topology theory of mine ventilation network[J].Procedia Earthand Planetary Science,2009,1(1):354-360.
[2]牛会永,周心权,张辛亥.煤炭自燃防灭火技术的组织与管理[J].矿业安全与环保,2008,35(4):80-82.NIU Huiyong,ZHOU Xinquan,ZHANG Xinhai. Organization and management of coal spontaneous combustion fireprevention and extinguishing technology[J].Mining Safety and Environmental Protection,2008,35(4):80-82.
[3]裴桂红,冷静,刘玉学,等.采空区漏风及残煤瓦斯涌出对采场气流的影响[J].西南石油大学学报:自然科学版,2015,37(3):160-167.PEI Guihong,LENG Jing,LIU Yuxue,et al.Effects of god air leakage andresidual methane emissin on minin-g stope flow field[J].Journal of Southwest Petroleum University:Natural Science Edition,2015,37(3):160-167.
[4]黄金,杨胜强,褚廷湘,等.采空区自燃三带漏风流场的数值模拟[J].煤炭科学技术,2009,37(6):60-63.HUANG Jin,YANG Shengqiang,CHU Tingxiang,et al. Numerical simulation on air leakage field spontaneous combustion three zone of goaf[J].Coal Science and Technology,2009,37(6):60-63.
[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.LIU Wei,QIN Yueping,HAO Yongjiang,et al. Numerical simulation onair leakage flow field in spontaneous combustion three zone of goaf[J].Journal of Liaoning University of Engineering and Technology:Natural Science Edition,2013,32(7):874-879.
[6]崔岩,秦汝祥,史磊.采空区自燃“三带”分布的数值模拟[J].煤矿安全,2013,44(6):30-33.CUI Yan,QIN Ruxiang,SHI Lei.Numerical simulation of spontaneous combustion“three zones”distribution in goaf[J].Safety in Coal Mines,2013,44(6):30-33.
[7]高建良,孙望望.J型通风工作面采空区漏风与瓦斯浓度分布规律研究[J].煤炭工程,2018,50(1):132-136.GAO Jianliang,SUN Wangwang.Study on air leakage and gas concentration distribution law in working face goaf with J type ventilation system[J].Coal Engineering,2018,50(1):132-136.
[8]刘雷政.浅埋藏近距离煤层群开采上覆采空区煤自燃危险区域判定[D].徐州:中国矿业大学,2015.
[9]张立国.浅埋深近距离易自燃煤层群复合采空区漏风规律研究[J].煤矿安全,2018,49(S1):5-8,13.ZHANG Liguo.Study on air leakage laws in complex goaf of shallow buried depth and close distance spontaneous combustion coal seams[J].Safety in Coal Mines,2018,49(S1):5-8,13.
[10]马砺,肖旸,文虎,等.深井伪俯斜综放采空区漏风规律数值模拟[J].湖南科技大学学报:自然科学版,2010,25(1):17-21.MA Li,XIAO Yang,WEN Hu,et al. Numerical simulation of air leakage in goaf of fully mechanized caving with pseudo-dipping deep mine[J].Journal of Hunan University of Science and Technology:Natural Science Edition,2010,25(1):17-21.
[11]牛会永,邓湘陵,李石林,等.封闭顺序对煤矿火区气体分布规律的影响[J].中南大学学报:自然科学版,2016,47(9):3239-3245.NIU Huiyong,DENG Xiangling,LI Shilin,et al. Influence of closed sequence on distribution of gas in coal mine fire zone[J].Journal of Central South University:Natural Science Edition,2016,47(9):3239-3245.
[12]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):1203-1207.LIANG Yuntao,ZHANG Tengfei,WANG Shugang,et al. Heterogeneous model of porosity in gobs and its air flow field distribution[J].Journal of China Coal Society,2009,34(9):1203-1207.
[13]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 andspontaneous combustion in goaf[J].CoalScience and Technology,2016,44(12):96-101.
[14]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):1494-1498.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:Natural Science Edition,2012,43(4):1494-1498.
[15]秦波涛,鲁义,殷少举,等.近距离煤层综放面瓦斯与煤自燃复合灾害防治技术研究[J].采矿与安全工程学报,2013,30(2):311-316.QIN Botao,LU Yi,YIN Shaoju,et al.Prevention and control technique of complex disaster caused by gas andspontaneous combustion for fully mechanized sublevel caving face in close-distance seams[J].Journal of Mining&Safety Engineering,2013,30(2):311-316.
[16]杨胜强,秦毅,孙家伟,等.高瓦斯易自燃煤层瓦斯与自燃复合致灾机理研究[J].煤炭学报,2014,39(6):1094-1101.YANG Shengqiang,QIN Yi,SUN Jiawei,et al. Research on coupling hazard mechanism of mine gas and coal fire for agassy and high spontaneous combustion propensity coal seam[J]. Journal of China Coal Society,2014,39(6):1094-1101.
[17] DENG J,LEI C K,XIAO Y,et al.Determination and prediction on“three zones”of coal spontaneous combustion in a gob of fully mechanized caving face[J].Fuel,2018,211:458-470.
[18]吴根水,余伟健,王平,等.基于逾渗机理的含瓦斯煤体变形破坏机制及试验研究[J].煤炭学报,2018,43(3):724-734.WU Genshui,YU Weijian,WANG Ping,et al.Deformation failure mechanism and experimental study of gas-bearing coal rock mass basedon percolation mechanism[J]. Journal of China Coal Society,2018,43(3):724-734.
[19]黄戈,张勋,王继仁,等.近距离煤层上覆采空区自燃形成机理及防控技术[J].煤炭科学技术,2018,46(8):107-113.HUANG Ge,ZHANG Xun,WANG Jiren,et al. Ormationmechanism and prevention technology of spontaneous combustion occurred in overburden goaf in contiguous seams[J]. Coal Science and Technology,2018,46(8):107-113.
[20] XIE Z H,CAI J,ZHANG Y.Division of spontaneous combustion“three-zone”in goaf of fully mechanizd coal face with big dipand hard roof[C]//2012 internat-ional symposium on safety scienceand engineering in China.Procedia Engineering,2012:82-87.
[21]王刚,王锐,武猛猛,等.火区下近距离煤层开采有害气体入侵灾害防控技术[J].煤炭学报,2017,42(7):1765-1775.WANG Gang,WANG Rui,WU Mengmeng,et al. Prevention and control technology of harmful gas intrusion in closeup coal seam under fire area[J].Journal of China Coal Society,2017,42(7):1765-1775.
[22] WEI Lianjiang.Topology theory of mine ventilation network[J].Procedia Earthand Planetary Science,2009,1(1):354-360.