基于PyroSim的粮食储备库火灾仿真模拟分析

Simulation Analysis of the Grain Storage Fire Based on the PyroSim

为研究粮食储备库发生火灾后对作业人员的影响,应用PyroSim软件对粮食储备库进行火灾模拟。选取应用较为广泛的平房仓为研究对象建立物理模型,针对磷化氢熏蒸口引起的火灾场景,分析火灾烟气发展和温度分布情况,并提出预防措施。结果表明:烟气形成阶段和向上发展阶段为灭火和作业人员疏散的最佳时期,此时烟气尚未弥漫至整个仓房;烟气在顶部扩散时作业人员应马上撤离;烟气充满仓房时作业人员严禁进入仓内;10~100 s之间是火灾发生和发展阶段,1.5 m以下范围仓房温度未达到人员极限忍受范围;100 s到10 min由于燃烧物充分燃烧,温度不断升高,作业人员面临烧伤风险。

In order to study the effect of the fire on the workers,the PyroSim was used to simulate the fire of in grain reserve storages in this paper.The widely used warehouse was selected as the research object,and the physical model was established.Aiming at the fire scenario caused by phosphine fumigation port,the development of fire smoke and temperature distribution were analyzed,and preventive measures were proposed.The results showed that the formation stage and upward development stage of smoke are the best time for fire fighting and evacuation of operators,and the smoke has not diffused to the entire warehouse.And the operators should evacuate immediately when the smoke diffuses at the top.The operators are forbidden to enter the warehouse when the smoke fills the warehouse.The temperature of the warehouse below 1.5 meters does not reach the limit of the personnel endurance range between 10 seconds and 100 seconds.And due to the full combustion of the combustor,the temperature keeps rising,and the operators are facing the risk of burns in 100 seconds to 10 minutes.