Fig. 5. Reaction rate constant of thermal decomposition pathway
1 of CF3I.
3.3. Fire extinguishing performance of
CF3I
Considering the above physiochemical characteristics and thermal
decomposition products, CF3I may be a candidate for
clean fire-extinguishing agent. Therefore, the FEC of
CF3I, HFO-1336mzz(E) and three HFCs were determined by
using the cup-burner method involving methane/propane fuel. And the
reliability of our experimental measurement was
verified14 by comparing our measured FEC value
(9.70vol%) for propane-air flame with that tested by the standard ISO
14520-1-2006 Part 8 (9.7vol%). As listed in Table.2 ,
CF3I exhibits the lowest FEC (3.61vol%) for
extinguishing the propane-air flame, even lower than that of Halon 1301
(3.8vol%-4.3vol%) measured by Fumiaki18. For
propane-air flame, the FEC performance of CF3I is much
better than three HFCs and HFO-1336mzz(E). For extinguishment of
methane-air flame, the FEC of CF3I is also the lowest
(3.42vol%), which is comparable to that of Halon 1301
(2.9vol%-4.0vol%). Therefore, the fire-extinguishing performance of
CF3I is obviously better than those of HFCs and is
comparable to that of Halons.