Inhibition of Combustion by Bromine-Free Polyfluorocarbons I. Burning Velocities of Methane Flames Containing Polyfluoroalkylamines
作者:
KAZUO TAKAHASHI,
YOSHINOBU SEKIUJI,
TADAAKI INOMATA,
TAKASHI ABE,
HARUHIKO FUKAYA,
EIJI HAYASHI,
GEN INOUE,
期刊:
Combustion Science and Technology
(Taylor Available online 1994)
卷期:
Volume 102,
issue 1-6
页码: 213-230
ISSN:0010-2202
年代: 1994
DOI:10.1080/00102209408935477
出版商: Taylor & Francis Group
关键词: Fire-extinguishers;halon alternatives;polyfluoroalkylamines;burning velocity;ozone depletion
数据来源: Taylor
摘要:
To estimate the inhibition effect of several bromine-free polyfluoroalkylamines such as (CF3CF2)N, (CF3)2NCF2CF3, (CF3)2NCF2,CHF2and (CF3)2NCF=CF2on flame propagation, the laminar burning velocity was measured for a mixture of 9.5% methane, 90.0% air, and 0.5% inhibitor, at an initial temperature of 298 ± 2 K. and a pressure of 1 atm. All of the polyfluoroalkylamines inhibited flame propagation less than CF3Br(Halon 1301), but more than CH3CHFCF3(FM200). Calculations showed that the inhibition effect of polyfluoroalkylamines was caused not only by physical factors, but also by a chemical process in which fluoric species capture chain carriers (H, O, and OH) ofcombustion reactions to form stable HF molecules. The inhibition efficiencies of polyfluoroalkylamines were found to be higher than those of polyfluoroalkanes because of polyfluoroalkylamines decomposition to reactive polyfluoroalkyl radicals in the lower temperature region of each flame. The application of polyfluoralkylamines to fire-extinguishers was also discussed
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