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国际上关于火灾烟气毒性最大工况的争议已有多年,有人认定它发生在有焰燃烧工况,也有人认定它发生在无焰燃烧工况。该文作者采用热重-Fourier变换红外分析仪(TG-FTIR),并结合他人DIN53436的试验结果,在氮气氛下,对木材进行热解实验。对不同特性的材料在纯热解、无焰燃烧和有焰燃烧条件下一氧化碳的生成规律进行了分析。结果表明:烟气毒性最大工况与材料的特性和燃烧条件密切相关,对于固定碳含量较高的材料,烟气毒性最大工况发生在有焰燃烧工况,反之则发生在无焰燃烧工况。
International controversy over the maximum toxic condition of fire smoke has been around for many years, and some have argued that it occurs in a flaming combustion condition, while others believe it occurs in a flameless combustion condition. The author uses TG-FOURIER transform infrared analyzer (TG-FTIR), combined with the test results of others DIN53436, in a nitrogen atmosphere, the pyrolysis experiments on wood. The formation characteristics of carbon monoxide under different conditions of pure pyrolysis, flameless combustion and flame propagation were analyzed. The results show that the most toxic condition of flue gas is closely related to the characteristics of the material and the combustion conditions. For the materials with higher carbon content, the maximum flue gas toxicity occurs in the flaming combustion condition, and vice versa in the flameless combustion condition.