烟气“分层”条件下高大空间自然排烟

Natural Smoke Extraction in Large Space under the Condition of Smoke Stratification

阐述了烟气流动模型、烟气“分层”原因、自然排烟原理,主要讨论生烟气“分层”条件下高大空间的自然排烟可行性,并应用PyroSim建立火灾模型进行验证,结果表明:即使在没有排烟设施情况下,随着烟气增加,烟气“分层”现象消失。烟气“分层”条件下,自然排烟仍然有效,排烟窗也不必安装在烟气到达高度,其高度越高其自然排烟效果越好。

This paper describes the smoke flow model,the reason of smoke stratification and the principle of natural smoke exhausting.This paper mainly discusses the feasibility of natural smoke exhausting in large space under the condition of smoke stratification.The fire model was established by pyrosim.The results show that:Even in the absence of smoke extraction facilities,With the increase of flue gas,smoke stratification will disappear.Under the condition of smoke stratification,natural smoke exhausting is still effective.The smoke exhaust window does not need to be installed at the height where the smoke reaches.The higher the height,the better the natural smoke exhausting effect.