Abstract
In order to explore the possibility of
C2HF3Cl2(R123) for the fire extinguishing agent of aircraft cargo compartment,
this paper conducted experimental and theoretical research on the fire
extinguishing performance and mechanism of R123, furthermore, the
analogous C2HF5 (R125) was compared to
explore the in-depth fire extinguishing mechanism. The minimum
extinguishing concentration (MEC) of R123 in methane/air flames is 7.31
%, which is lower than 8.91 % of R125. And the experimental results
reveal interesting examples of flame height and temperature changed with
the addition of R123. The flame height had a phenomenon to increase
first and then decrease, in comparison, the flame height kept rising
with R125 adding. And the change in height reflected the addition of
R123 to affect the movement of the reaction kernel, so that the
temperature at different heights changed, but the temperature as a whole
showed the tendence of decreasing. In addition, theoretical calculations
indicated that R123 and pyrolysis products could affect the combustion
reaction, such as
CF3CHCl2+H=CF3CHCl+HCl,
HCl + OH = Cl + H2O,
CF3CH2Cl=CF3+CH2Cl,
these fluorine-containing or chlorine-containing groups generated had an
excellent effect on the suppression of combustion chain reactions. The
in-depth experimental and theoretical study of R123 boost the
development of ideal halon replacement in aircraft cargo compartment.