屏蔽门开启对地铁站台烟气控制的影响

Influence of screen door on the smoke control in metro station platform

利用FDS软件建立的模型,研究地铁车站岛式站台在不同火灾场景(火源功率为2 MW或5 MW,屏蔽门开启数量为两组或三组)下火灾烟气的水平蔓延。通过数值计算,得出火灾时站台层内烟气温度、CO体积分数以及烟气层高度随时间的变化情况,并确定地下车站站台层不同火灾场景下的烟气控制优化方案。研究结果表明:在火源功率为2 MW时,开启两组或是三组屏蔽门,人员均可安全疏散。在火源功率为5 MW时,开启两组屏蔽门,人员均不能安全疏散;开启三组屏蔽门时,风机流量在607 248~948 780 m^3/h时,人员可以安全疏散。

Based on the model of FDS software,the horizontal spread of fire flue gas in underground metro station platform was studied in different fire scenes(the power of the combustion source is 2 MW or 5 MW,and the number of doors opening is two or three).By numerical calculation,the temperature of smoke,CO concentration and the height of smoke layer in the platform during the fire were obtained.And then the optimization scheme of smoke control under different fire scenes in underground metro station platform was determined.Research results showed that:when the power of the combustion source is 2 MW and two or three screen door sare opened,the passengers can evacuate safely.When the power of the combustion source is 5 MW,the passengers cannot evacuate safely if two screen doors are opened,but the passengers can evacuate safely when three screen doors are opened and fan flow rate is in the range of 607 248~948 780 m3/h.