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Premixed Flame Inhibition by Manganese and Tin Compounds

Published

Author(s)

Gregory T. Linteris, Vadim D. Knyazev, Valeri I. Babushok

Abstract

In this work we presented the first experimental measurements of influence of manganese- and tin-containing compounds (MMT, TMT0 on burning velocity of methane/air flames. We have also developed kinetic models describing the inhibition mechanisms. Comparisons with Fe(CO)5 and CF3Br demonstrate that manganese and tin-containing agents are effective inhibitors. The inhibition efficiency of MMT is about a factor of two less than that of iron pentacarbonyl, and that of TMT is about twenty-six times less effective, although TMT is about twice as effective as CF3Br. There exist conditions for which both MMT and TMT show a loss of effectiveness beyond that expected due to radical depletion, and the cause is believed to be particle formationl. Simulations of MMT- and TMT-inhibited flames show reasonable agreement with experimental data. The decomposition of the parent molecule for the tin and manganese species is found to have a small effect on the inhibition properties for the concentrations in this work calculations confirmed that the main species of tin compounds in the flame zone is SnO, while the concentration of SnO2, SnOH and Sn are relatively small. The inhibition effect of TMT is determined mostly by the rate of the association reaction H+SnO+M, and the catalytic recombination cycle is completed by the reactions SnOH+H=SnO+H2 and SnOH+OH=SnO+H2O =Mn(OH)2; Mn(OH2 + H = MnOH + OH(or H) = MnO + H (orH2) and the burning velocity is most sensitive to the rate of the second of these.
Proceedings Title
Halon Options Technical Working Conference, 2001
Conference Dates
April 24-26, 2001
Conference Title
Halon Options Technical Working Conference

Keywords

fire suppression, flame inhibition, halon replacement, kinetic mechanism, manganese, organometallic, tin

Citation

Linteris, G. , Knyazev, V. and Babushok, V. (2001), Premixed Flame Inhibition by Manganese and Tin Compounds, Halon Options Technical Working Conference, 2001, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=861094 (Accessed April 25, 2024)
Created April 1, 2001, Updated February 19, 2017