基于Ventsim的矿井运输巷火灾风烟流应急调控技术

    Emergency control technology of air and smoke flow in mine belt roadway fire based on Ventsim software

    • 摘要: 矿井带式输送机火灾因突发性强、救灾灭火难度大而易导致重大人员伤亡,快速有效地控风、排烟和撤人是救灾关键。通过研究井巷火灾及其次生灾害的风烟流致灾机理及防控机制,优化了原控风排烟方案的风量分配和供风路径,提出了不同火灾场景的风烟流应急联动调控方法;基于弗劳德数守恒模型(Froude)研究倾斜巷道中火灾风烟流达平衡的临界条件,得到了防止烟流逆退的临界风速和最小排烟风量的计算公式,量化了最佳的控风排烟方案;利用Ventsim软件建立羊场湾煤矿三维可视化通风网络模型,分别模拟了不同火源点场景的风烟流蔓延规律与采取控风排烟方案前后的排烟效果和风量分配。结果表明:优化后的调控方案能够既满足控排烟路径最小风量,也能保障采区人员逃生及稀释瓦斯最低所需风量,进一步完善了灾变风烟流应急调控方案。

       

      Abstract: Mine belt fires are prone to cause heavy casualties due to their strong suddenness and difficulty in disaster relief and fire fighting. Quick and effective wind control, smoke exhaust, and evacuation are the keys to disaster relief. By studying the disaster mechanism and prevention and control mechanism of wind and smoke flow of well fire and its secondary disasters, the air volume distribution and air supply path of the original air control and smoke exhaust scheme were optimized, and the emergency linkage control method of wind and smoke flow in different fire scenarios was proposed. Based on the Froude number conservation model(Froude), the critical conditions for the balance of fire wind and smoke flow in inclined roadways are studied, and the formulas of critical wind speed and minimum exhaust air volume to prevent backsliding of smoke flow are obtained, and the optimal air control and exhaust scheme is quantified. The three-dimensional visualization ventilation network model of Yangchangwan Coal Mine is established by Ventsim software. The spreading law of wind and smoke flow in different fire source point scenarios and the smoke exhaust effect and air volume distribution before and after adopting the air control and smoke exhaust scheme are simulated respectively. The simulation results show that the optimized regulation scheme can not only satisfy the minimum air volume of the smoke control and exhaust path but also ensure the minimum air volume required for the escape of the people in the mining area and the gas dilution. The emergency control plan for catastrophic wind and smoke flow has been further improved.

       

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