煤矿平巷火灾数值模拟及其特征参数研究
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摘要
为了研究火灾产生的烟气在巷道中的运移和分布规律,采用单混合分数PDF非预混燃烧模型进行了三维瞬态数值模拟,分析研究了煤矿水平巷道发生火灾时期的温度场和烟气逆流层的变化规律。结果表明:火源强度一定时,通过对火灾过程中0.5、1.0、1.5、1.8、2.0、2.5 m/s等不同进风速度的模型求解,得出存在阻止高温烟气向火源点上风侧传播和运移的极限风速,模型中的极限风速V_(min)=2.0~2.5 m/s;并推出了逆流层关于风流速度的函数表达式。风流速度一定时,通过对火灾过程中5.24、10.48、15.72、20.96 MW等不同火源强度的模型求解,得出不同火源强度,巷道内温度场的瞬态变化规律;并推算出逆流层关于火源强度的函数表达式。
In order to study migration and distribution law of a mine fire disaster smoke in the mine roadway,a PDF non pre-mixed combustion model with a single mixture fraction was applied to the 3D transient numerical simulation. The variation law of the temperature field and the smoke countercurrent layer during a fire disaster occurred in a drift of a coal mine were analyzed and studied. The results showed that when the fire source intensity was certain,with the solution of the model with 0.5,1.0,1.5,1.8,2.0 and 2.5 m/s and other different air intake velocity in the mine fire disaster process,the results showed that there was a limit air velocity existed to prevent the spread and migration of the high temperature smoke to the top air side of the fire source and the limit air velocity Vminin the model was 2.0 ~ 2.5 m/s. Also a function expression of the air flow velocity for the countercurrent layer was provided. When the air flow velocity was certain,with the solution on the model with 5.24,10.48,15.72 and 20.96 MW and other different fire source intensity in the fire disaster process,the results showed that under the different fire source intensity,the transient variation law of the temperature field within the mine roadway was obtained and a function expression of the fire source intensity for the countercurrent layer was provided.
In order to study migration and distribution law of a mine fire disaster smoke in the mine roadway,a PDF non pre-mixed combustion model with a single mixture fraction was applied to the 3D transient numerical simulation. The variation law of the temperature field and the smoke countercurrent layer during a fire disaster occurred in a drift of a coal mine were analyzed and studied. The results showed that when the fire source intensity was certain,with the solution of the model with 0.5,1.0,1.5,1.8,2.0 and 2.5 m/s and other different air intake velocity in the mine fire disaster process,the results showed that there was a limit air velocity existed to prevent the spread and migration of the high temperature smoke to the top air side of the fire source and the limit air velocity Vminin the model was 2.0 ~ 2.5 m/s. Also a function expression of the air flow velocity for the countercurrent layer was provided. When the air flow velocity was certain,with the solution on the model with 5.24,10.48,15.72 and 20.96 MW and other different fire source intensity in the fire disaster process,the results showed that under the different fire source intensity,the transient variation law of the temperature field within the mine roadway was obtained and a function expression of the fire source intensity for the countercurrent layer was provided.
引文
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[15]李玉福.矿井火灾过程烟流参数变化规律数值模拟研究[D].阜新:辽宁工程技术大学,2012.
[16]刘经纬,李玉福.水平巷道烟流逆流层长度CFD数值模拟[J].辽宁工程技术大学学报:自然科学学报,2014,33(8):1053-1057.Liu Jingwei,Li Yufu.CFD numerical simulation of the length of countercurrent layer in level tunnel[J].Journal of Liaoning Technical University:Natural Science,2014,33(8):1053-1057.
[17]郑力铭.ANSYS fluent 15.0:流体计算从入门到精通[M].北京:电子工业出版社,2015:15-19.
[18]Ghenai Chaouki,Janajreh Isam.CFD analysis of the effects of cofiring biomass with coal[J].Energy Conversion and Management2010,51(8):1694-1701.
[19]蒋军成,王省身.矿井火灾巷道烟气流动模型[J].矿冶工程,1997,17(2):6-10.Jiang Juncheng,Wang Xingshen.The mine tunnel fire smoke flow field model[J].Mining and Metallurgy Engineering,1997,17(2):6-10.
[20]周心权.矿井火灾救灾理论与实践[M].北京:煤炭工业出版社,1996,26-34.
[21]周福宝,王德明.巷(隧)道火灾烟流滚退距离的无因次关系式[J].中国矿业大学学报,2003,32(4):407-410.Zhou Fubao,Wang Deming.Non-dimensional expression for backflow distances of smoke and hot gases in roadway or tunnel fire[J].Journal of China University of Mining&Technology,2003,32(4):407-410.
[2]邓军,文虎,徐精彩.煤自然发火预测理论及技术[M].西安:陕西科学技术出版社,2001:42-47.
[3]徐精彩.煤自燃危险区域判定理论[M].北京:煤炭工业出版社,2002:37-43.
[4]王海燕,周心权.平巷烟流滚退火烟羽流模型及其特征参数研究[J].煤炭学报,2004,29(2):190-194.Wang Haiyan,Zhou Xinquan.Fire buoyant plume model and characteristic parameters of a reverse smoke in a horizontal airway during mine fire[J].Journal of China Coal Society,2004,29(2):190-194.
[5]周福宝,王德明.巷道火灾烟流滚退距离的理论研究[J].湘潭矿业学院学报,2003,18(4):22-24.Zhou Fubao,Wang Deming.Theoretical study on the backflow distance of smoke and hot gases in a roadway fire[J].Journal of Xiangtan Mining Institute,2003,18(4):22-24.
[6]周福宝,王德明.矿井火灾烟流滚退距离的数值模拟[J].中国矿业大学学报,2004,33(5):499-503.Zhou Fubao,Wang Deming.Numerical analysis of backflow distance of smoke in mine fire[J].Journal of China University of Mining&Technology,2004,33(5):499-503.
[7]周心权,王海燕,赵红泽.平巷烟流滚退逆行规律[J].北京科技大学学报,2004,26(2):118-121.Zhou Xinquan,Wang Haiyan,Zhao Hongze.Rollback law of reverse smoke flow in a horizontal airway during mine fire[J].Journal of University of Science and Technology Beijing,2004,26(2):118-121.
[8]焦宇,周心权,康与涛.矿井平巷木材火灾烟流滚退理论分析与实验研究[J].煤炭学报,2010,35(12):2106-2110.Jiao Yu,Zhou Xinquan,Kang Yutao.Theoretical analysis and experimental study on backflow smoke of mine laneway wood fire[J].Journal of China Coal Society,2010,35(12):2106-2110.
[9]李宗翔,王雅迪,高光超,等.巷道火灾火焰局部阻力模型构建及参数识别[J].煤炭学报,2015,40(4):909-914.Li Zongxiang,Wang Yadi,Gao Guangchao,et al.Development of local resistance model of roadway fire flames and parameter identification[J].Journal of China Coal Society,2015,40(4):909-914.
[10]李翠平,曹志国,钟媛.矿井火灾的场量模型构建及其可视化仿真[J].煤炭学报,2015,40(2):902-908.Li Cuiping,Cao Zhiguo,Zhou Yuan.Field variables modeling and visualization simulation of fire disaster in underground mine[J].Journal of China Coal Society,2015,40(2):902-908.
[11]段军,林俊森,陈绍祥,等.基于Fluent的火灾时期掘进巷道烟流变化的数值模拟[J].煤炭技术,2014,33(9):310-312.Duan Jun,Lin Junsen,Chen Shaoxiang,et al.Numerical simulation of fire smoke flow in tunnel changes based on fluentc[J].Coal Technology,2014,33(9):310-312.
[12]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.
[13]刘业娇,天志超,王文才,等.火灾巷道烟流速度变化规律研究[J].煤炭工程,2016,48(3):85-91.Liu Yejiao,Tian Zhichao,Wang Wencai,et al.Variation law of smoke flow speed in tunnel during fire period[J].Coal Engineering,2016,48(3):85-91.
[14]邓权龙.矿井巷道火灾烟流数值模拟及安全区域划分[D].赣州:江西理工大学,2015.
[15]李玉福.矿井火灾过程烟流参数变化规律数值模拟研究[D].阜新:辽宁工程技术大学,2012.
[16]刘经纬,李玉福.水平巷道烟流逆流层长度CFD数值模拟[J].辽宁工程技术大学学报:自然科学学报,2014,33(8):1053-1057.Liu Jingwei,Li Yufu.CFD numerical simulation of the length of countercurrent layer in level tunnel[J].Journal of Liaoning Technical University:Natural Science,2014,33(8):1053-1057.
[17]郑力铭.ANSYS fluent 15.0:流体计算从入门到精通[M].北京:电子工业出版社,2015:15-19.
[18]Ghenai Chaouki,Janajreh Isam.CFD analysis of the effects of cofiring biomass with coal[J].Energy Conversion and Management2010,51(8):1694-1701.
[19]蒋军成,王省身.矿井火灾巷道烟气流动模型[J].矿冶工程,1997,17(2):6-10.Jiang Juncheng,Wang Xingshen.The mine tunnel fire smoke flow field model[J].Mining and Metallurgy Engineering,1997,17(2):6-10.
[20]周心权.矿井火灾救灾理论与实践[M].北京:煤炭工业出版社,1996,26-34.
[21]周福宝,王德明.巷(隧)道火灾烟流滚退距离的无因次关系式[J].中国矿业大学学报,2003,32(4):407-410.Zhou Fubao,Wang Deming.Non-dimensional expression for backflow distances of smoke and hot gases in roadway or tunnel fire[J].Journal of China University of Mining&Technology,2003,32(4):407-410.