盖下列车运用库火灾工况机械排烟效果研究

Research on Mechanical Smoke Exhaust Effect of Covered Train Operation Depot under Fire Condition

以某盖下列车运用库为例,对火灾工况下不同排烟方式的效果进行模拟分析。无喷淋装置时,与单纯采取机械排烟相比,开启射流风机辅助机械排烟可有效降低CO体积分数、烟气温度,使远离火源点的大部分区域CO体积分数低于限值。射流风机射流俯角向下7.5°时,可最大限度降低CO体积分数及烟气温度。有喷淋装置时,开启射流风机辅助机械排烟可降低CO体积分数、烟气温度,但效果不显著。从经济角度出发,对于有喷淋装置的运用库,发生火灾时,可不开启射流风机辅助机械排烟。

Taking a covered train operation depot as an example,the effect of different smoke exhaust modes under fire condition is simulated and analyzed.When there is no sprinkler device,compared with mechanical smoke exhaust alone,turning on the jet fan to assist mechanical smoke exhaust can effectively reduce the CO volume fraction and flue gas temperature,making the CO volume fraction in most areas far from the fire source lower than the limit value.When the jet depression angle of the jet fan is 7.5°downward,the CO volume fraction and flue gas temperature can be minimized.When there is a sprinkler device,turning on the jet fan to assist mechanical smoke exhaust can reduce the CO volume fraction and flue gas temperature,but the effect is not significant.From an economic point of view,for the operation depot with sprinkler device,in the event of a fire,it is not necessary to turn on the jet fan to assist mechanical smoke exhaust.