Etude de la combustion de gaz de synthèse issus d'un processus de ...

Experimental set ups and diagnostics
100%
Ignition success (%)
80%
60%
40%
20%
Pi=1.0 bar
Pi=3.0 bar
0%
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
Equivalence ratio
tel-00623090, version 1 - 13 Sep 2011
Ignition success (%)
Figure 3.5– Flammability limits of the downdraft syngas-air mixture.
100%
80%
60%
Pi=1.0 bar
Pi=3.0 bar
40%
20%
0%
0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1
Equivalence ratio
Figure 3.6 – Flammability limits of the fluidized bed syngas-air mixture.
Figure 3.4 shows that the flammable region for the updraft syngas-air mixture for 1.0
bar and 293K is between 0.4 and 1.4 equivalence ratios. Increasing the initial pressure
to 3.0 bar, the lean flammability limit is reduced to φ=0.5.
Figure 3.5 shows that the flammable region for the downdraft syngas-air mixture for 1.0
bar and 293K is between 0.3 and 1.6 equivalence ratios. Pressure increase for φ=0.3 is
only 20% of the initial pressure. Increasing the initial pressure to 3.0 bar, the lean
flammability limit is reduced to φ=0.4.
Figure 3.6 shows that the flammable region for the fluidized bed syngas-air mixture for
1.0 bar and 293K is between 0.5 and 1.0 equivalence ratios. Increasing the initial
pressure to 3.0 bar, the lean flammability limit is reduced to φ=0.6.
70