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Premixed Flame Inhibition by Manganese and Tin Compounds.

pdf icon Premixed Flame Inhibition by Manganese and Tin Compounds. (292 K)
Linteris, G. T.; Knyazev, V.; Babushok, V. I.

Halon Options Technical Working Conference. Proceedings. HOTWC 2001. Sponsored by: University of New Mexico, Fire Suppression Systems Assoc., Fire and Safety Group, GlobeTech, Inc., Halon Alternative Research Corp., Hughes Associates, Inc., Kidde, plc., Modular Protection, Corp., Next Generation Fire Suppression Technology Program, Sandia National Laboratories, Summit Environmental Corp., Inc. and 3M Specialty Materials. April 24-26, 2001, Albuquerque, NM, Daniels, B. L.; Cole, D. G., Editor(s)(s), 72-82 pp, 2001.

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halon alternatives; premixed flames; manganese; tin; flame inhibition; fire suppression; kinetic mechanism; organometallics; halons


Flame inhibition data exist for a few metallic compounds (Fe(CO)5, Pb(C2H5)4, CrO2Cl2) which show them to be one or two orders of magnitude more effective than halon 1301 at reducing the burning velocity of premixed methane-air flames. Little burning velocity data exist, however, for other metallic compounds. We present the first data on the effect of methylcyclopentadienylmanganese tricarbonyl (MMT) and tetramethyltin TMT on the burning velocity of premixed methane-air flames for a range of stoichiometries and oxygen mole fractions in the oxidizer. We also present kinetic mechanisms for tin and manganese in flames, and use these to predict the effect of these compounds on burning velocity and hence the overall reaction rate. We use the kinetic descriptions to infer the mechanism of flame inhibition and compare the performance of these compounds with that of Fe(CO)5. Finally, we discuss the implications of the present results with respect to the utility of metals as additives to inert gases fire suppressants for unoccupied spaces.