火灾烟气危害性气体在狭长通道内水平方向迁移的模拟实验研究

利用狭长通道的小型实验台模拟研究了火灾烟气毒性成分在水平方向上的迁移规律.结果发现,火灾烟气危害性成分水平方向上的演变非常相似,而不同高度水平面上的烟气成分浓度有些差别,这主要是建筑结构中各种开口或者空气流动造成的.数据表明,CO等气体到达浓度峰值的时间随着高度的降低而逐渐增加.其中,O2和CO2到达峰值的时间比较一致,而CO则与前两者不一致,整体滞后80秒左右,这可能因为热烟气在传播过程又新生成了CO.

EXPERIMENTAL STUDY ON THE HORIZONTAL TRANSPORT OF THE TOXICANT SPECIES IN FIRES IN THE LONG CORRIDOR

A set of reduced-scale fire tests were conducted in a long corridor structure apparatus to study the characteristic of the toxicant species in the transport of fires smoke.Results indicate that the toxicant species concentrations are approximate horizontally and the vents in the buildings play a key role on leading the asymmetric distribution of the species in the horizontal level noticeably.It is found that the time to maximum of O_2 and CO_2 is approximate,but they are not consistent with that of CO with ahead of about 80 seconds which is due to the sub-formation of CO by the deoxidization of O_2,CO_2 and unburned hydrocarbon in the smoke movement.