巷道火灾时期流场及瓦斯浓度变化规律数值模拟研究
|
摘要
为了合理控制巷道入口风速,减少火灾的发生并降低灾害造成的损失,利用Fluent数值模拟软件对某煤矿巷道发生火灾时的流场进行数值模拟研究,探讨了不同的入口风速对火灾的速度场、温度场以及对瓦斯涌出分布的影响。结果表明:入口风速越大,对巷道内风流分布的影响越小,火焰区域速度最低,速度的纵向分布呈现出"圆弧层状"降低分布,并且圆弧顶部不同程度向下凹陷;火灾会引起巷道内瓦斯浓度增大,风速低时瓦斯最高浓度可达到瓦斯爆炸下限,造成瓦斯爆炸;风速的变化,会使"烟流滚退"的距离有较大的改变,且风速越大,巷道内排烟效果越显著。通过分析模拟结果发现,合理控制巷道入口风速对防止瓦斯爆炸和灾后巷道内烟气排放有显著作用。
This paper aims to properly control the inlet air velocity of roadway and reduce the occurrence of fire and its damage in coal mines. Fluent is used to conduct the numerical simulation of airflow in a coal mine roadway in the presence of fire. The effects of different inlet speeds on the velocity field,temperature field and distribution of gas emission are discussed. The results show that the greater inlet air velocity is associated with smaller influence on air flow distribution in the roadway and the lowest air velocity is located in the flame zone.The longitudinal distribution profile of the velocity forms an"arc layered"shape.As fire increases the gas concentration in the roadway,when air velocity is low,the gas concentration can reach the lower limit of gas explosion,causing gas explosion. Changes of air velocity would cause large change in the distance of"smoke flow back". The greater the air velocity is,the more significant the smoke exhaust effect in the roadway is. The simulation results show that properly control of the inlet air velocity of roadways has a significant effect on preventing gas explosion and smoke emission in the roadway after fire and explosion.
This paper aims to properly control the inlet air velocity of roadway and reduce the occurrence of fire and its damage in coal mines. Fluent is used to conduct the numerical simulation of airflow in a coal mine roadway in the presence of fire. The effects of different inlet speeds on the velocity field,temperature field and distribution of gas emission are discussed. The results show that the greater inlet air velocity is associated with smaller influence on air flow distribution in the roadway and the lowest air velocity is located in the flame zone.The longitudinal distribution profile of the velocity forms an"arc layered"shape.As fire increases the gas concentration in the roadway,when air velocity is low,the gas concentration can reach the lower limit of gas explosion,causing gas explosion. Changes of air velocity would cause large change in the distance of"smoke flow back". The greater the air velocity is,the more significant the smoke exhaust effect in the roadway is. The simulation results show that properly control of the inlet air velocity of roadways has a significant effect on preventing gas explosion and smoke emission in the roadway after fire and explosion.
引文
[1]ZHANG S,WU Z,ZHANG R,et al.Dynamic numerical simulation of coal mine fire for escape capsule installation[J].Safety Science,2012,50:600-606.
[2]RAN Vijay,KUMAR Singh.Spontaneous heating and fire in coal mines[J].Procedia Engineering,2013,62:78-90.
[3]SONG Z,KUENZERC.Coal fires in China over the last decade:Acomprehensive review[J].International Journal of Coal Geology,2014,133:72-99.
[4]安敬鱼,牛会永,邓军,等.矿井火灾原因综合分析及防治技术[J].矿业工程研究,2015,30(3):40-44.AN Jingyu,NIU Huiyong,DENG Jun,et al.Comprehensive causes and treatment technology of mine’s fire[J].Mineral Engineering Research,2015,30(3):40-44.
[5]王凯,蒋曙光,张卫青,等.矿井火灾应急救援系统的数值模拟及应用研究[J].煤炭学报,2012,37(5):857-862.WANG Kai,JIANG Shuguang,ZHANG Weiqing,et al.Numerical simulation and application research of mine fire emergency rescue system[J].Journal of China Coal Society,2012,37(5):857-862.
[6]梁栋.矿内瓦斯运移规律及其应用[D].北京:中国矿业大学(北京),1996.
[7]ZHANG Q,QIN B,YAN,H,et al.A methodology to predict shock over pressure decay in a tunnel produced by a premixed methane/air explosion[J].Loss Prevention in the Process Industries,2016,44:275-281.
[8]高建良,王春霞,徐昆伦.贯通巷道风流流场数值模拟若干关键问题研究[J].中国安全科学学报,2009,19(8):21-27,177.GAO Jianliang,WANG Chunxia,XU Kunlun.Research of several key problemsin numerical simulation of flow field of airway[J].China Safety Science Journal,2009,19(8):21-27,177.
[9]程卫民,姚玉静,吴立荣,等.基于Fluent的矿井火灾时期温度及浓度分布数值模拟[J].煤矿安全,2012,43(2):20-24.CHENG Weimin,YAO Yujing,WU Lirong,et al.Fluent-based numerical simulation of temperature and concentration during mine fire[J].Safety in Coal Mines,2012,43(2):20-24.
[10]苏传荣,王海燕.矿井掘进巷道火灾数值模拟研究[C]//2006(沈阳)国际安全科学与技术学术研讨会论文集,2006.
[11]HARLOWF H,WELCH J E.Numerical calculation of time-dependent viscous incompressible flow of fluid with free surface[J].Physics of Fluids,1965,8(12):2182.
[12]马洪亮,周心权,王轩.多单元区域方法在矿井火灾模拟中的应用[J].煤炭科学技术,2008,36(1):62-64,81.MA Hongliang,ZHOU Xinquan,WANG Xuan.Application of multi element area method to mine fire disaster simulation[J].Coal Science and Technology,2008,36(1):62-64,81.
[13]周西华,王继仁,卢国斌,等.回采工作面温度场分布规律的数值模拟[J].煤炭学报,2002,27(1):59-63.ZHOU Xihua,WANG Jiren,LU Guobin,et al.The numerical simulation of distribution law of temperature field in coal face[J].Journal of Coal Society,2002,27(1):59-63.
[14]王文才,乔旺,李刚,等.矿井巷道火灾烟流运动理论研究[J].工矿自动化,2011,37(3):22-25.WANG Wencai,QIAO Wang,LI Gang,et al.Research of movement theory of fire smoke flow of mine roadway[J].Industry and Mine Automation,2011,37(3):22-25.
[15]史文芳.矿井火灾烟气流动及温度分布规律数值模拟研究[D].太原:太原理工大学,2013.
[16]何学秋.中国煤矿灾害防治理论与技术[M].徐州:中国矿业大学出版社,2006.
[17]秦跃平,王浩,郭开元,等.巷道围岩温度场有限体积法模拟计算及实验分析[J].煤炭学报,2017,42(12):3166-3175.QIN Yueping,WANG Hao,GUO Kaiyuan,et al.Simulation of finite volume method and experimental analysis for temperature field of roadway surrounding rock[J].Journal of China Coal Society,2017,42(12):3166-3175.
[18]丁翠.矿井巷道风流状态“关键环”实验与数值研究[D].北京:中国矿业大学(北京),2013.
[19]李文蜜.六面体和三棱柱网格形态对煤矿开采沉陷数值模拟的影响研究[D].北京:中国地质大学(北京),2013.
[20]RYBDYLOVA O,POULTON L,AL QUBEISSI M,et al.A model for multi-component droplet heating and evaporation and its implementation into ANSYS Fluent[J].International Communications in Heat and Mass Transfer,2018,90:29-33.
[21]张辛亥,丁峰,张玉涛,等.井下烟道在巷道火灾中的作用数值模拟[J].煤矿安全,2017,48(4):48-51.ZHANG Xinhai,DING Feng,ZHANG Yutao,et al.Numerical analysis of underground flue effect on mine roadway fire[J].Safety in Coal Mines,2017,48(4):48-51.
[22]朱海刚,周心权,姜伟,等.矿井火灾对巷道瓦斯积聚影响的研究[J].矿业安全与环保,2008,35(3):18-20,91.ZHU Haigang,ZHOU Xinquan,JIANG Wei,et al.Study on the influence of mine fire on gas accumulation in roadway[J].Mining Safety&Environmental Protection,2008,35(3):18-20,91.
[23]齐庆杰,赵尤信,李兴华.采空区CO涌出量预测模型[J].煤炭科学技术,2018,46(2):182-186.QI Qingjie,ZHAO Youxin,LI Xinghua,et al.Prediction modal of CO emission volume from goaf[J].Coal Science and Technology,2018,46(2):182-186.
[24]陈亮,邬长福,陈祖云,等.矿井巷道火灾安全区域划分数值模拟[J].消防科学与技术,2016,35(5):633-636.CHEN Liang,WU Changfu,CHEN Zuyun,et al.Numerical simulation of fire safety zone division in mine roadway[J].Fire Science and Technology,2016,35(5):633-636.
[25]贾进章,马恒,刘剑.矿井火灾时期温度分布数值模拟研究[J].辽宁工程技术大学学报,2003,22(4):35-41.JIA Jinzhang,MA Heng,LIU Jian.Numerical simulation for temperature distribution during mine fire period[J].Journal of Liaoning Technical University,2003,22(4):35-41.
[2]RAN Vijay,KUMAR Singh.Spontaneous heating and fire in coal mines[J].Procedia Engineering,2013,62:78-90.
[3]SONG Z,KUENZERC.Coal fires in China over the last decade:Acomprehensive review[J].International Journal of Coal Geology,2014,133:72-99.
[4]安敬鱼,牛会永,邓军,等.矿井火灾原因综合分析及防治技术[J].矿业工程研究,2015,30(3):40-44.AN Jingyu,NIU Huiyong,DENG Jun,et al.Comprehensive causes and treatment technology of mine’s fire[J].Mineral Engineering Research,2015,30(3):40-44.
[5]王凯,蒋曙光,张卫青,等.矿井火灾应急救援系统的数值模拟及应用研究[J].煤炭学报,2012,37(5):857-862.WANG Kai,JIANG Shuguang,ZHANG Weiqing,et al.Numerical simulation and application research of mine fire emergency rescue system[J].Journal of China Coal Society,2012,37(5):857-862.
[6]梁栋.矿内瓦斯运移规律及其应用[D].北京:中国矿业大学(北京),1996.
[7]ZHANG Q,QIN B,YAN,H,et al.A methodology to predict shock over pressure decay in a tunnel produced by a premixed methane/air explosion[J].Loss Prevention in the Process Industries,2016,44:275-281.
[8]高建良,王春霞,徐昆伦.贯通巷道风流流场数值模拟若干关键问题研究[J].中国安全科学学报,2009,19(8):21-27,177.GAO Jianliang,WANG Chunxia,XU Kunlun.Research of several key problemsin numerical simulation of flow field of airway[J].China Safety Science Journal,2009,19(8):21-27,177.
[9]程卫民,姚玉静,吴立荣,等.基于Fluent的矿井火灾时期温度及浓度分布数值模拟[J].煤矿安全,2012,43(2):20-24.CHENG Weimin,YAO Yujing,WU Lirong,et al.Fluent-based numerical simulation of temperature and concentration during mine fire[J].Safety in Coal Mines,2012,43(2):20-24.
[10]苏传荣,王海燕.矿井掘进巷道火灾数值模拟研究[C]//2006(沈阳)国际安全科学与技术学术研讨会论文集,2006.
[11]HARLOWF H,WELCH J E.Numerical calculation of time-dependent viscous incompressible flow of fluid with free surface[J].Physics of Fluids,1965,8(12):2182.
[12]马洪亮,周心权,王轩.多单元区域方法在矿井火灾模拟中的应用[J].煤炭科学技术,2008,36(1):62-64,81.MA Hongliang,ZHOU Xinquan,WANG Xuan.Application of multi element area method to mine fire disaster simulation[J].Coal Science and Technology,2008,36(1):62-64,81.
[13]周西华,王继仁,卢国斌,等.回采工作面温度场分布规律的数值模拟[J].煤炭学报,2002,27(1):59-63.ZHOU Xihua,WANG Jiren,LU Guobin,et al.The numerical simulation of distribution law of temperature field in coal face[J].Journal of Coal Society,2002,27(1):59-63.
[14]王文才,乔旺,李刚,等.矿井巷道火灾烟流运动理论研究[J].工矿自动化,2011,37(3):22-25.WANG Wencai,QIAO Wang,LI Gang,et al.Research of movement theory of fire smoke flow of mine roadway[J].Industry and Mine Automation,2011,37(3):22-25.
[15]史文芳.矿井火灾烟气流动及温度分布规律数值模拟研究[D].太原:太原理工大学,2013.
[16]何学秋.中国煤矿灾害防治理论与技术[M].徐州:中国矿业大学出版社,2006.
[17]秦跃平,王浩,郭开元,等.巷道围岩温度场有限体积法模拟计算及实验分析[J].煤炭学报,2017,42(12):3166-3175.QIN Yueping,WANG Hao,GUO Kaiyuan,et al.Simulation of finite volume method and experimental analysis for temperature field of roadway surrounding rock[J].Journal of China Coal Society,2017,42(12):3166-3175.
[18]丁翠.矿井巷道风流状态“关键环”实验与数值研究[D].北京:中国矿业大学(北京),2013.
[19]李文蜜.六面体和三棱柱网格形态对煤矿开采沉陷数值模拟的影响研究[D].北京:中国地质大学(北京),2013.
[20]RYBDYLOVA O,POULTON L,AL QUBEISSI M,et al.A model for multi-component droplet heating and evaporation and its implementation into ANSYS Fluent[J].International Communications in Heat and Mass Transfer,2018,90:29-33.
[21]张辛亥,丁峰,张玉涛,等.井下烟道在巷道火灾中的作用数值模拟[J].煤矿安全,2017,48(4):48-51.ZHANG Xinhai,DING Feng,ZHANG Yutao,et al.Numerical analysis of underground flue effect on mine roadway fire[J].Safety in Coal Mines,2017,48(4):48-51.
[22]朱海刚,周心权,姜伟,等.矿井火灾对巷道瓦斯积聚影响的研究[J].矿业安全与环保,2008,35(3):18-20,91.ZHU Haigang,ZHOU Xinquan,JIANG Wei,et al.Study on the influence of mine fire on gas accumulation in roadway[J].Mining Safety&Environmental Protection,2008,35(3):18-20,91.
[23]齐庆杰,赵尤信,李兴华.采空区CO涌出量预测模型[J].煤炭科学技术,2018,46(2):182-186.QI Qingjie,ZHAO Youxin,LI Xinghua,et al.Prediction modal of CO emission volume from goaf[J].Coal Science and Technology,2018,46(2):182-186.
[24]陈亮,邬长福,陈祖云,等.矿井巷道火灾安全区域划分数值模拟[J].消防科学与技术,2016,35(5):633-636.CHEN Liang,WU Changfu,CHEN Zuyun,et al.Numerical simulation of fire safety zone division in mine roadway[J].Fire Science and Technology,2016,35(5):633-636.
[25]贾进章,马恒,刘剑.矿井火灾时期温度分布数值模拟研究[J].辽宁工程技术大学学报,2003,22(4):35-41.JIA Jinzhang,MA Heng,LIU Jian.Numerical simulation for temperature distribution during mine fire period[J].Journal of Liaoning Technical University,2003,22(4):35-41.