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Study on the inhibition of hydrogen explosion pressure and flame propagation by trifluoroiodomethane.

Study on the inhibition of hydrogen explosion pressure and flame propagation by trifluoroiodomethane.

Authors :
Luo, Zhen-min
Nan, Fan
Cheng, Fang-ming
Xiao, Yang
Wang, Tao
Li, Rui-kang
Su, Bin
Source :
International Journal of Hydrogen Energy. Jan2024:Part D, Vol. 49, p670-680. 11p.
Publication Year :
2024

Abstract

A 20L spherical device and a schlieren system were used to study the suppression effect of CF 3 I on the hydrogen explosion pressure and flame characteristics. The results show that CF 3 I can promote and inhibit the pressure parameters of hydrogen under lean fuel, but only inhibit the pressure parameters of hydrogen under equivalence ratios and rich fuel. Such as, φ = 0.6, adding 10 % CF 3 I, the maximum explosion pressure increased by 8.8 %. φ = 1, adding 5 % CF 3 I, the maximum explosion pressure decreased by 25 %. Different from the explosion pressure, the laminar burning velocity of hydrogen with different equivalence ratio decreases gradually with the increase of CF 3 I concentration. Numerical simulation was used to reveal the mechanism of CF 3 I inhibiting hydrogen. The results show that the concentration of active free radicals(H, O, OH) decreases with the increase of trifluoroiodomethane concentration. Further analysis on the rate of production and sensitivity of H free radicals found that R822 and R839 are the main generation reactions of H free radicals in the fluorine- and iodine-containing elemental reactions, and R1397, R1396, R1391 and R859 are the main consumption of H free radicals reaction. The elementary reaction with the greatest inhibitory effect on H free radicals is R1391, and the elementary reaction with the greatest promoting effect is R850. • CF 3 I has two effects of promoting and suppressing hydrogen explosion pressure. • Analysis of the effect of suppressant on hydrodynamic instability. • CF 3 I has inhibitory effect on laminar burning velocity of hydrogen. • The kinetic mechanism of CF 3 I suppressing hydrogen explosion was analyzed. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
03603199
Volume :
49
Database :
Academic Search Index
Journal :
International Journal of Hydrogen Energy
Publication Type :
Academic Journal
Accession number :
174060198
Full Text :
https://doi.org/10.1016/j.ijhydene.2023.10.182