Fire extinguishing performance and fire extinguishing mechanism of perfluorobutyl methyl ether

doi:10.16265/j.cnki.issn1003-3033.2023.12.0775

Abstract

Abstract:

In order to comprehensively reveal the fire-extinguishing reaction path of perfluorobutyl methyl ether, its fire extinguishing performance and fire extinguishing mechanism were investigated by combining experimental and theoretical methods. The fire extinguishing performance of perfluorobutyl methyl ether was evaluated by cup combustion test, and its high-temperature thermal decomposition process was simulated by a gas high-temperature pyrolysis mechanism analysis platform, and the pyrolysis products at different temperatures were analyzed by gas chromatography-mass spectrometry. It was found that the critical fire extinguishing volume fraction of perfluorobutyl methyl ether was about 5.90%, and the fire extinguishing performance was good. The initial thermal decomposition temperature of perfluorobutyl methyl ether was 400 ℃, and the pyrolysis products include nonafluoro-1-butane, octafluoro-1-butene, hexafluoropropane and trifluoromethane. The test results revealed the fire-extinguishing mechanism of perfluorobutyl methyl ether, indicating its potential to become a substitute for halon fire-extinguishing agents.

Key words: perfluorobutyl methyl ether, fire extinguishing performance, fire extinguishing mechanism, thermal decomposition, gas fire extinguishing agent

WANG Kai, WANG Dezheng, ZHOU Biao, LI Xueyao. Fire extinguishing performance and fire extinguishing mechanism of perfluorobutyl methyl ether[J]. China Safety Science Journal, 2023, 33(12): 47-52.

Figures/Tables 9

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空气体积流量/ (L·min^-1)	灭火剂质量流量/ (g·min^-1)	灭火剂体积流量/ (L·min^-1)	燃烧器内混合气体温度/℃	临界灭火体积分数/%
15.10	8.272	1.013	36	6.29
28.83	15.642	1.916	37	6.23
41.19	21.206	2.597	35.5	5.93
54.92	28.125	3.445	36	5.90

气体灭火剂	临界灭火体积分数/%
三氟甲烷	16.1
六氟丙烷	7.8
七氟丙烷	8.4

序号	质荷比	对应物质
1	CF+(31); CHF₂+(51); CF₃+(69)	三氟甲烷
2	CF+(31); C₂F+(43); CF₂+(50); CF₃+(69); C₂F₃+(81); C₃F₃+(93); C₂F₄+(100); C₃F₄+(112); C₃F₅+(131)	六氟丙烯
3	CF+(31); CF₂+(50); CF₃+(69); C₂F₃+(81); C₃F₃+(93); C₂F₅+(119); C₃F₅+(131); C₃F₆+(150); C₄F6+(162); C₄F₇+(181); C₅F₇+(200)	八氟-1- 丁烯
4	CF+(31); CF₂+(50); CHF₂+(51); CF₃+(69); C₂F₄+(100); C₂F₅+(119); C₃F₅+(131); C₃F₆+(150); C₃F₇+(169); C₄F₇+(181); C₄F₉+(219)	九氟-1- 丁烷
5	CH₃O+(31); CF₂+(50); CF₃+(69); C₂F₄+(100); C₂F₅+(119); C₃F₆+(150); C₃F₇+(169); C₄F₉+(219); C₄F₉O+(235)	全氟丁基甲醚