地铁站毒气泄漏事故模拟及后果分析

The Simulation and Consequence Analysis of Toxic Gas Leakage in a Subway Station

针对地铁站可能发生的毒气泄漏或恐怖袭击,借助FDS软件,进行事故模拟及后果分析。结果表明,无排烟情况下,氯气向四周稳定扩散和富集,空间内毒气总量线性增加,但浓度上升缓慢,利于事故初期的人员疏散;有排烟情况下,氯气流快速上升并形成漩涡,造成局部区域浓度较高,但有利于排尽,其控灾效果更为显著。

Considering the potential toxic gas leakage or terrorist attacks inside the subway station,the FDS software was used to simulate this disaster.And also the simulation results were analyzed.The results show that,on the condition of no smoke evacuation,the chlorine would spread over and cumulate somewhere.The total mass of the toxic gas would rise linearly.But the concentration of the chlorine would grow slowly,which would benefit the evacuation.However with a smoke evacuation,the chlorine went up quickly and formed a vortex,which resulted in a high gas concentration locally,but was good for clearly exhaustion and the smoke evacuation was more efficient for gas control.