坡度对上行通风火灾影响的数值模拟
|
摘要
为探究上行通风时巷道坡度对矿井巷道火灾烟气流动的影响规律,应用火灾动力学模拟软件Pyrosim建立巷道线火源延燃模型,并依据美国职业安全与卫生研究所的全尺寸巷道火灾试验对模型参数有效性进行验证。基于以上参数,以山西省晋煤集团成庄某回风巷道为背景,建立了不同坡度上行通风巷道模型,对其火灾时期产生温度场和压力场进行数值模拟,分析巷道内部温度和压力分布,以及烟气蔓延规律。模拟结果显示:上行通风时巷道坡度增大,可使火灾初始蔓延速率加快,抑制烟气逆流的临界风速变小,同时火灾高温区域向下风侧偏移,温度整体下降,进出口压差增大。
In order to investigate the influence of roadway slope on the smoke flow of fire in mine roadway during updraft ventilation, the fire dynamics simulation software Pyrosim was used to establish the flame propagation model of the roadway line and the effectiveness of the model parameters was verified based on the full-size roadway fire test conducted by Institute of Occupational Safety and Health in the United States. Based on the above parameters, a wind tunnel model with different gradients was established with the return airway of Chengzhuang Coal Mine in Shanxi Province, and the temperature and pressure fields generated during the fire were numerically simulated to analyze the temperature, pressure distribution and the spread of smoke inside the tunnel. The simulation results show that when the uphill roadway slope is increased during updraft ventilation, the initial rate of fire propagation can be accelerated, the critical wind speed to restrain the reverse flow of flue gas decreased. At the same time, the high-temperature fire area is shifted to the downwind side, the temperature decreases as a whole, and the pressure difference at the inlet and outlet increases.
In order to investigate the influence of roadway slope on the smoke flow of fire in mine roadway during updraft ventilation, the fire dynamics simulation software Pyrosim was used to establish the flame propagation model of the roadway line and the effectiveness of the model parameters was verified based on the full-size roadway fire test conducted by Institute of Occupational Safety and Health in the United States. Based on the above parameters, a wind tunnel model with different gradients was established with the return airway of Chengzhuang Coal Mine in Shanxi Province, and the temperature and pressure fields generated during the fire were numerically simulated to analyze the temperature, pressure distribution and the spread of smoke inside the tunnel. The simulation results show that when the uphill roadway slope is increased during updraft ventilation, the initial rate of fire propagation can be accelerated, the critical wind speed to restrain the reverse flow of flue gas decreased. At the same time, the high-temperature fire area is shifted to the downwind side, the temperature decreases as a whole, and the pressure difference at the inlet and outlet increases.
引文
[1]张兴凯.矿井火灾严重程度评价[J].中国安全科学学报,2005,15(4):25-28.
[2] Yuan L, Mainiero R J, Rowland J H, et al. Numerical and experimental study on flame spread over conveyor belts in a large-scale tunnel[J]. Journal of Loss Prevention in the Process Industries, 2014,30(1):55-62.
[3]齐庆杰,王欢,董子文,等.矿井胶带运输巷火灾蔓延规律的数值模拟研究[J].中国安全科学学报,2016,26(10):36-41.
[4]王伟峰,马砺,王刘兵,等.矿井带式输送机火灾蔓延规律数值模拟研究[J].煤矿安全,2017,48(4):40.
[5]张晓涛,王莉霞,李列平.矿井下行通风巷道火灾的数值模拟研究[J].安全与环境工程,2014,21(3):94.
[6]张圣柱,程卫民,张如明,等.矿井胶带巷火灾风流稳定性模拟与控制技术研究[J].煤炭学报,2011,36(5):812-817.
[7]马洪亮,周心权.矿井火灾燃烧特性曲线的研究与应用[J].煤炭学报,2008,33(7):780-783.
[8]王德明,程远平,周福宝,等.矿井火灾火源燃烧特性的实验研究[J].中国矿业大学学报,2002,31(1):30.
[9]王思仪,李宗翔,李静.坡度对巷道火灾影响的数值模拟[J].辽宁工程技术大学学报(自然科学版),2013,32(12):1590-1594.
[10]齐庆杰,王欢,周新华,等.线火源与点火源在巷道火灾中烟流特性对比[J].辽宁工程技术大学学报(自然科学版),2017,36(2):147-153.
[11]王德明,周福宝,周延.矿井火灾中的火区阻力及节流作用[J].中国矿业大学学报,2001,30(4):328.
[2] Yuan L, Mainiero R J, Rowland J H, et al. Numerical and experimental study on flame spread over conveyor belts in a large-scale tunnel[J]. Journal of Loss Prevention in the Process Industries, 2014,30(1):55-62.
[3]齐庆杰,王欢,董子文,等.矿井胶带运输巷火灾蔓延规律的数值模拟研究[J].中国安全科学学报,2016,26(10):36-41.
[4]王伟峰,马砺,王刘兵,等.矿井带式输送机火灾蔓延规律数值模拟研究[J].煤矿安全,2017,48(4):40.
[5]张晓涛,王莉霞,李列平.矿井下行通风巷道火灾的数值模拟研究[J].安全与环境工程,2014,21(3):94.
[6]张圣柱,程卫民,张如明,等.矿井胶带巷火灾风流稳定性模拟与控制技术研究[J].煤炭学报,2011,36(5):812-817.
[7]马洪亮,周心权.矿井火灾燃烧特性曲线的研究与应用[J].煤炭学报,2008,33(7):780-783.
[8]王德明,程远平,周福宝,等.矿井火灾火源燃烧特性的实验研究[J].中国矿业大学学报,2002,31(1):30.
[9]王思仪,李宗翔,李静.坡度对巷道火灾影响的数值模拟[J].辽宁工程技术大学学报(自然科学版),2013,32(12):1590-1594.
[10]齐庆杰,王欢,周新华,等.线火源与点火源在巷道火灾中烟流特性对比[J].辽宁工程技术大学学报(自然科学版),2017,36(2):147-153.
[11]王德明,周福宝,周延.矿井火灾中的火区阻力及节流作用[J].中国矿业大学学报,2001,30(4):328.