地铁轨顶排热系统协同站台火灾排烟方案研究

Scheme study on rail top heat exhaust system cooperating with platform fire smoke exhaust

以武汉某地铁车站为例,通过数值模拟和实验测试,对地铁车站站台发生火灾时轨顶排热系统协同站台火灾排烟方案和站台端部专用排烟风管方案进行研究。研究表明,轨顶排热系统协同站台火灾排烟方案可行,各楼梯、扶梯口处均能形成向下不小于1.5 m/s阻止烟气向上蔓延的气流;当轨顶侧排烟口均匀布置时,站台火灾联动设备最少,协同排烟效果最好。站台端部专用排烟风管协同站台火灾排烟方案,在车站楼梯、扶梯口数量较多时,楼梯、扶梯口部阻挡气流风速存在低于1.5 m/s的风险,应慎重选用。

Through numerical simulation and experimental tests,different cooperative smoke exhaust schemes are studied when a fire occurs on the platform of a subway station in Wuhan.The results show that the scheme of the rail top heat exhaust system cooperating with platform fire smoke exhaust is feasible,and the air flow of no less than 1.5 m/s downward can be formed at the escalators of each building to prevent the smoke from spreading upward;when the smoke outlet on the top side of the rail is uniformly arranged,the platform fire linkage equipment is the least,and the cooperative smoke exhaust effect is the best.There is a risk that the wind speed at the escalator entrance of the building is less than 1.5 m/s,when adopt the scheme of special smoke exhaust duct at the end of the platform cooperates with platform fire smoke exhaust,if there are a large number of escalator entrances in the station building,so it should be carefully selected.