六氟丙烯的灭火性能研究

Study on fire extinguishing performance of hexafluoropropylene

六氟丙烯(HFP)因双键的存在满足哈龙替代灭火剂在环保性方面的要求,但目前对其灭火性能研究较少,其与火焰作用的效果尚不清楚。利用杯式燃烧器研究HFP对甲烷和丙烷火焰的灭火性能,并与结构相似的饱和含氟烷烃六氟丙烷(HFC-236fa)和七氟丙烷(HFC-227ea)进行对比。结果表明,HFP比HFC-236fa和HFC-227ea更早出现了火焰高度和亮度下降的趋势,且对火焰温度的提升和降低作用更明显。HFP的双键结构使含氟基团与火焰中的自由基更容易发生反应,放出大量热,导致火焰温度急剧上升,随后大量消耗火焰中的自由基,使温度骤降。

Hexafluoropropylene(HFP) meets the environmental friendly requirements of Halon alternative fire extinguishing agent due to the existence of the C=C double bond. However,there are few studies focus on its fire extinguishing performance, and the interaction with flame is still unclear. In this paper, the fire extinguishing performance of HFP on methane and propane flames is studied by cup burner, and it was compared with saturated fluoroalkane, hexafluoropropane(HFC-236fa)and heptafluoropropane(HFC-227ea). The results indicated that HFP has an earlier trend of decreasing flame height and brightness than HFC-236fa and HFC-227ea, and has a more obvious effect on the increase or decrease of flame temperature.The C=C double bond structure of HFP makes it easier for fluorine-containing groups to react with free radicals in the flame, resulting in a sharp rise in the flame temperature, and then consume a lot of free radicals in the flame, resulting in a sudden drop in the temperature.