Acid Gas Production in Inhibited Diffusion Flames.
Acid Gas Production in Inhibited Diffusion Flames.
(815 K)
Linteris, G. T.; King, M. D.; Liu, A.; Womeldorf, C. A.;
Hsin, Y. E.
Halon Options Technical Working Conference.
Proceedings. HOTWC 1994. May 3-5, 1994, Albuquerque, NM,
177-191 pp, 1994.
Keywords:
halons; diffusion flames; halon 1301; experiments; halon
alternatives
Abstract:
The proposed replacements to halon 1301, mainly
fluorinated and chlorinated hydrocarbons, are expected
to be required in significantly higher concentrations
than CF3Br to extinguish fires. At these higher
concentrations the by-products of the inhibited flames
may include correspondingly higher portions of corrosive
gases, including HF and HCl. To examine the chemical
and transport-related mechanisms important in producing
these acid gases, a series of inhibited flame tests have
been performed with several types of laboratory-scale
burners, varying agent type and concentration, and fuel
type. A wet-chemistry analysis of the final products of
the flames using ion-selective electrodes for F and Cl
provided an experimental basis for quantitative
understanding of the HF and HCl production. Production
rates were measured for co-flow laminar and turbulent
diffusion flames. Systematic selection of the agent
concentrations, burner type, and air flow rates allowed
an assessment of the relative importance of agent
transport and chemical kinetics on the acid gas
production rates. These experimental results were then
compared to a model which estimates the maximum HF and
HCl production rates based on stoichiometric reaction to
the most stable products. The results demonstrate the
relative significance of F, Cl, and H in the inhibitor
and fuel, as well as the effect of different burner
configurations.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899