地铁站厅中杂货亭火灾场景特性研究

Study on fire scenarios characteristic for subway fire

采用地铁站厅中的杂货亭模型实体火灾试验,研究地铁站厅杂货亭的火灾场景,得出了模拟站厅杂货亭在火灾中的热释放速率、烟气浓度、温度、烟密度的变化规律,站厅杂货亭发生轰燃的时间、最大热释放量。火灾中烟气是首先弥漫整个房顶,然后再向下蔓延。

Taking into account the arson terrorism, the fire scenarios characteristic of subway fire had been studied by substantiality model of grocery booth of subway platform. The change rule of heat release rate, smoke concentration, temperature and smoke density had been educed. We can get the conclusion that the time of boom burn was 190 s in the test and the most heat release quantity achieved at 2.58 MW. With burn processing, the concentration of both CO2 and CO was rapidly raised. After the boom burn, the concentration of CO achieved the highest value that was two times than of allowed exposure most concentration of CO. In the smoke, a lot of HCN was existed and the concentration of HCN is 63 times than of allowed concentration at 209 s. During fire, smoke and gas suffused all of booth roof firstly, then pervaded to floor. The cold atmosphere layer was under 0. 97 m and the most temperature of smoke achieved at 451.9 C.