分析某大型餐厅的火灾危险性,设定不同火源位置下的火灾场景,利用火灾模拟动力学软件FDS结合人员疏散的经验公式,计算相应的可用疏散时间与必须疏散时间,得出安全评价结果。结果表明:同样的火灾功率,不同火源位置的火灾场景下的疏散情况有很大不同;机械排烟系统对火灾蔓延控制十分重要。建议该餐厅加大排烟能力,增设安全出口。 The risk of fire in a large restaurant is analyzed. The fire scene under different fire sources is set up. Based on the fire evacuation dynamics software FDS combined with the evacuation experience formula, the available evacuation time and evacuation time are calculated to get the safety evaluation result . The results show that there is a great difference between the same fire power and the evacuation situations under different fire sources; the mechanical smoke evacuation system is very important to the control of fire spread. Suggest that the restaurant to increase smoke exhaust capacity, additional safety exit.