Inhibitor Influence on the Bistability of a CSTR.
Inhibitor Influence on the Bistability of a CSTR.
(1123 K)
Babushok, V. I.; Noto, T.; Burgess, D. R. F., Jr.;
Hamins, A.; Tsang, W.
Combustion and Flame, Vol. 108, No. 1/2, 61-70, January
1997.
Keywords:
inhibitors; methane; combustion; kinetics; heat
transfer; autoignition
Abstract:
Methane combustion in a continuously stirred flow tank
reactor (CSTR) in the presence and absence of chemical
inhibitors such as CF3I, CF3Br, CF3H, and a chemically
inert gas with high heat capacity is simulated with the
CHEMKIN program. The aim of the work is to determine
the differences in results arising from the use of the
various inhibitors with the aim of establishing the
capability of CSTR experiments to give a rank ordering
of suppressant power. The chemical inhibitors have the
general tendency to raise the steady-state temperature.
A high heat capacity inert gas leads to the opposite
effect. Only near extinction and self-ignition can one
obtain a proper scale of flame suppression capability.
The curves for combustion efficiency, (CO2/[CO + CO2]),
near the extinction point lead to results where the data
for the additives all fall within the envelope for
stoichiometric methane/air combustion in the extinction
region. For self-ignition, the transition from the
mushroom to the isola form of the stability curves
appears to be another property that is highly sensitive
to suppression power. These observations may serve as a
basis for testing inhibiiton capabilities.
