PVC燃烧时HCl的释放规律

火灾中PVC燃烧后会产生大量HCl气体,危及人的生命安全.利用火灾烟气发生装置和红外傅立叶变换气体分析仪(FTIR)对PVC热解和燃烧时产生的烟气中的HCl气体浓度进行了实时在线的定量分析,结果表明PVC在受热升温后的热解阶段就会释放出大部分HCl气体,使得烟气毒性达到峰值.对于PVC燃烧产生的火灾,其烟气毒性最大工况发生在火焰出现之前.

THE RELEASE PATTERN OF HCl FROM THE COMBUSTION OF PVC

When PVC is burning during fire,it will produce a lot of HCl that is harmful to human beings.As the concentration of HCl is the main criterion of the HCl toxicity,it is important to detect the HCl concentration during the PVC fire.A fire smoke releasing device and a Fourier transform infrared spectrometer (FTIR) were used to conduct a quantitative on-line analysis on the concentration of HCl in smokes of PVC in a burning process.The results showed that although the concentration of HCl increased slightly when the PVC was on fire,PVC released most of HCl (about 80 percents) before that in the stage of thermal degradation,and the smoke toxicity reached a peak value.The phenomena indicated that the release pattern of HCl is quite different from that of CO and CO_2.So when the fire is caused by the combustion of PVC,it must be noticed that the worst case will happen before the flame occurs.