Analysis of the fire-extinguishing effect and the weakening of flame intensification of nonionic liquid water mist*
Analysis of the fire-extinguishing effect and the weakening of flame intensification of nonionic liquid water mist*
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DOI：
10.1080/00102202.2019.1596900
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发表时间：
2020-05
影响因子：
1.9
通讯作者：
Hailin Jia;H. Shen;Haijun Xiang;Dihui Li;R. Zhai
中科院分区：
文献类型：
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作者：
Hailin Jia;H. Shen;Haijun Xiang;Dihui Li;R. Zhai
摘要细水雾添加剂的确定对细水雾强化火焰的减弱具有重要意义，在一定程度上影响着细水雾灭火技术的安全性和适用性。本文以物理化学理论为基础，采用非离子型液体烷基酚环氧化合物（APE）作为细水雾添加剂，对非离子型液体细水雾扑灭油池火灾进行了系统的实验研究。结果表明，非离子液体细水雾具有较好的雾化参数。在非离子液体细水雾作用下，灭火时间和最高温度均随非离子液体质量分数的增加而降低。随着非离子液体质量分数的增加，火灾烟气中CO体积分数的最大值和维持高体积分数的时间减小。最小O2体积分数和从该最小值到正常值的恢复率随着非离子液体质量分数的增加而增加。非离子液体细水雾比纯水雾能更好地减弱火焰的强化作用，扑灭油池火。这是因为非离子液体水雾喷射后形成的悬浮空气和水气泡可以阻挡热辐射，切断氧气供应并隔离可燃物与氧气的接触。此外，由于高温，表面活性剂与水分子之间通过氢键连接的醚基断裂，导致HLB值降低，从而增强了在链式反应中捕获烃分子和H·、OH·自由基的能力。
ABSTRACT The determination of a water mist additive is important to weaken the flame enhanced by water mist, which affects the safety and applicability of the water mist fire-fighting technology to a certain extent. Based on the theory of physical chemistry, in this study, a water mist additive, that is, a nonionic liquid alkyl phenol epoxide (APE) condensate to weaken the flame intensification and systematically perform an experimental study on extinguishing the fire in oil pool with nonionic liquid water mist. The results show that the nonionic liquid water mist has better atomization parameters. The extinguishing time and the maximum temperature are all decreased with the increase of nonionic liquid mass fraction under the action of nonionic liquid water mist. The maximum CO volume fraction and the time to maintain a high CO volume fraction in fire flue gas decreases with the increasing nonionic liquid mass fraction. The minimum O2 volume fraction and the recovery rate from this minimum value to the normal value increases with increasing nonionic liquid mass fraction. The nonionic liquid water mist can weaken the flame intensification and extinguish the oil pool fire better than pure water mist. This is because the suspended air and water bubbles formed after the spraying of the nonionic liquid water mist can block heat radiation, cutting off the oxygen supply and isolating the contact of combustibles with oxygen. In addition, owing to high temperature, surfactant and water molecules linked by hydrogen bond ether group rupture, resulting in reduced HLB, thus enhancing the ability to trap hydrocarbon molecules and capture H• and OH• radicals in the chain reaction.