Research on fire extinguishing effect of perfluorohexanone through physical and chemical actions

doi:10.11949/0438-1157.20250746

Abstract

Abstract:

As a clean and efficient halon-alternative fire extinguishing agent, perfluorohexanone has garnered significant attention in fire prevention. To quantitatively evaluate its physicochemical fire suppression mechanisms for optimized system design, this study assessed the physical and chemical extinguishing effects by comparing perfectly stirred reactor (PSR) model results with enhanced cup-burner experimental data. PSR simulations revealed that chemical inhibition dominates when heat absorption in the combustion core zone is below 20% of its latent heat absorption capacity; physical and chemical effects become comparable between 20% and 30%; and physical effects prevail when exceeding 30% of latent heat absorption, reducing the critical extinguishing concentration by over 50%. Cup-burner tests comparing gaseous perfluorohexanone with its liquid mist (about 2 μm droplet size) demonstrated that the mist effectively mitigates the gas-phase combustion-promoting effect, lowering critical extinguishing concentrations for ethanol from 6.06% to 5.06% (16.5% reduction) and for n-heptane from 4.51% to 3.79% (16.0% reduction). Compared with the PSR simulation results, it is estimated that under experimental conditions, the heat absorption of perfluorohexanone in the core combustion zone utilized only 5% of its latent heat. Changing the perfluorohexanone droplet size can enhance its physical effect.

Key words: perfluorohexanone, physicochemical effects, chemical reactor, extinguish fire, numerical simulation

摘要：

作为哈龙替代灭火剂，全氟己酮在火灾防治中备受关注。为定量评估其物理和化学灭火作用进而优化系统设计，通过对比PSR（完全搅拌反应器）模型结果与改进后杯式燃烧器实验数据定量评价了全氟己酮的物理和化学灭火作用。PSR模拟发现，全氟己酮在燃烧核心区的吸热量不足其潜热吸热量的20%时化学抑制占主导，处于其潜热吸热量的20%~30%时物理作用和化学作用相当，大于其潜热吸热量的30%后物理效应占主导且临界灭火浓度降低超过50%。杯型燃烧器实验对比了全氟己酮气体和粒径约为2 μm的全氟己酮液雾，结果表明全氟己酮液雾能够有效减弱其气体的助燃效应，使其对乙醇和正庚烷燃料的临界灭火浓度分别从 6.06% 降至 5.06%（降幅 16.5%）和从 4.51% 降至 3.79%（降幅 16.0%）。与PSR模拟结果对比，估算实验工况下全氟己酮在核心燃烧区的吸热量发挥了其潜热的5%，改变全氟己酮液滴粒径可以提高其物理作用。

关键词: 全氟己酮, 理化作用, 化学反应器, 灭火, 数值模拟

CLC Number:

TQ 028.8

Tianshui LIANG, Sen ZHAO, Wenbin ZHANG, Wei ZHONG, Xiaolei GAO, Huiming FU, Jiabang WHANG. Research on fire extinguishing effect of perfluorohexanone through physical and chemical actions[J]. CIESC Journal, 2025, 76(12): 6761-6767.

梁天水, 赵森, 张文彬, 钟委, 高晓蕾, 傅慧明, 王家帮. 全氟己酮物理和化学作用灭火效果研究[J]. 化工学报, 2025, 76(12): 6761-6767.

Figures/Tables 4

Fig.1 Schematic diagram of experimental setup

Fig.2 Schematic diagram of PSR reactor

Fig.3 Minimum extinguishing concentration of perfluorohexanone and proportion of physical contribution under different heat absorption ratios

Fig.4 Flame height and width of ethanol and n-heptane under action of perfluorohexane liquid mist and gas

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