细水雾抑制巷道火灾蔓延影响因素研究

Study on influencing factors of fine water mist inhibiting fire spread in roadway

为探索细水雾抑制矿井胶带蔓延火灾的影响因素,利用火灾动力学模拟器(FDS)构建矿井巷道火灾蔓延几何模型,使用控制变量法,通过设置不同火源功率、雾通量、喷头安装距离与风速模拟细水雾抑制巷道火灾,观察不同工况的火场温度与热释放速率变化特征,揭示不同因素对火灾发展的影响。结果表明,细水雾对矿井火灾蔓延有良好的抑制作用,通过优化设计各种影响参数,可以更好地发挥细水雾冷却降温的作用;合理增加风速、雾通量和喷雾有效范围,可以有效提高灭火效率,降低温度和热释放效率;火源初始功率的变化也对细水雾灭火有较大影响,在其他条件相同的情况下,初始功率由2 MW增加到4 MW时,温度下降率由72.7%下降到32.7%。

In order to explore the influencing factors of fine water mist inhibiting the spread of mine tape fire,the fire dynamics simulator(FDS)was used to construct the geometric model of mine roadway fire spread.The control variable method was used to simulate the water mist inhibiting of roadway fire by setting different fire source powers,fog fluxes,nozzle installation distances and wind speeds.The characteristics of fire field temperature and heat release rate under different working conditions were observed,and the influence of different factors on fire development was revealed.The results show that the fine water mist has a good inhibitory effect on the spread of mine fire,and the effect of fine water mist cooling can be better played by optimizing the design of various influencing parameters.Reasonable increase of wind speed,fog flux and spray effective range can effectively improve the fire extinguishing efficiency and reduce the temperature and heat release efficiency.The change of the initial power of the fire source also has a great influence on the fine water mist fire extinguishing.Under the same other conditions,when the initial power increases from 2 MW to 4 MW,the temperature drop rate decreases from 72.7%to 32.7%.