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目的:研究当火灾发生时,楼梯间装有正压送风系统对火灾烟气浓度以及周围温度的影响,为高层建筑火灾防火规范设计做出理论支持。方法:应用FDS(Fire Dynamics Simulator)软件对高层建筑火灾进行模拟,来测定当火灾发生时,楼梯间有无正压送风系统对烟气浓度以及温度的影响。结果当楼梯间无正压送风时,楼梯间温度照比楼梯间设有正压送风系统时的温度要高很多,CO浓度也照比有正压送风系统时高很多。结论当高层建筑火灾发生时,楼梯间设有正压送风系统可抑制火灾烟气的蔓延,同时也可减少楼梯间烟气浓度以及可有效的控制楼梯间的温度,从而为火灾中逃生人员提供了便利的条件。
Objective: To study the influence of the positive pressure air supply system on the concentration of flue gas and the ambient temperature in the event of a fire, and to provide theoretical support for the fire protection design of high-rise buildings. Methods: FDS (Fire Dynamics Simulator) software was used to simulate the fire in high-rise buildings to determine the influence of positive pressure air supply system on the flue gas concentration and temperature in the event of a fire. Results When there was no positive pressure supply to the stairwell, the temperature of the staircase was much higher than the temperature of the staircase with the positive pressure air supply system, and the CO concentration was much higher than that of the positive pressure air supply system. Conclusion When a high-rise building fire occurs, a positive pressure air supply system in the staircase can suppress the spread of fire flue gas, reduce the flue gas concentration in the stairwell and effectively control the temperature of the stairway so that fire escape personnel Provides a convenient condition.