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本文采用FDS软件,对西安地铁2号线某岛式站台端部火源强度为5 MW的火灾工况进行了数值模拟。在采用事故风机(TVF)+站台空调通风与回风(SEF)+站台下侧排烟的强制通风(UPE)模式下,分析了屏蔽门的不同开启模式对能见度、烟气温度、CO浓度、热辐射和新风风速的影响。结果表明,着火6 min时,强制通风可以使站台和进入站台层的楼梯入口处的温度小于60℃,CO浓度小于312.5 mg/m3(250 ppm);全部或部分开启屏蔽门可以实现站台烟气层向站台隧道的抽吸,增加站台安全撤离区域。
In this paper, FDS software was used to simulate the fire conditions of 5 MW fire intensity at the end of an island platform of Xi’an Metro Line 2. In the mode of forced ventilation with exhaust fan (TVF) + site air conditioning ventilation and return air (SEF) + station smoke exhaust (UPE) mode, the effects of different opening modes of shielding door on visibility, flue gas temperature, CO concentration, Heat radiation and fresh air velocity effects. The results show that the forced ventilation can make the temperature of the platform and the entrance to the landing staircase less than 60 ℃ and the concentration of CO less than 312.5 mg / m3 (250 ppm) when the fire is ignited for 6 min, and the platform flue gas can be realized by opening the screen door in whole or in part The pumping of the tunnel to the platform increases the safety evacuation area of the platform.