火灾烟气毒性成分向远距离走廊传播危害性分析

Toxic analysis on toxic species of firesmoke in the transport to the remotelocation in the corridor

以试验方法研究燃烧过程中有毒烟气的传播。试验台尺寸约为普通建筑房间的1/3,在20~70 cm高度每隔10cm设置取样点,取样点的CO体积分数降为峰值的10%时停止测量。以峰宽时间（烟气体积分数曲线各部分中维持高于体积分数积分中值的时间）和体积分数积分中值的乘积为总危害性参数。测量CO及CO2的体积分数并计算其积分中值和峰宽时间。结果：垂直方向在40-60 cm高度范围内总危害性参数随高度增加而快速增大。水平方向总危害性参数曲线出现交织,远距离处总危害性可能出现大于近距离处的情况。

The toxic smoke propagation of fire was studied by experiment, The size of experiment room is 1/3 size of normal room. There are sampling point every 10 cm from the height of 20 cm to 70 cm. The testing was stopped when the volume concentration of CO at sampling point decline to 10% of the peak value. The peak width time is the corresponding time to the part of volume concentration curve which value is higher than integral middle value. The total hazard index is the product of peak width time and integral middle value of volume concentration. The volume concentration of CO and CO2 were tested to calculate the integral middle value and peak width time. Results： The total hazard index increases quickly with the increasing of height form 40 cm to 60 cm. The total hazard index curve of horizontal direction shows that the hazard at beyond could be bigger than vicinity.