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Hello Selvakumar
It is unlikely that spontaneous ignition will take place by adding cold air
to hot gas. If it did, all that would happen is that it would flash back to
the point where the air is being mixed with the gas.
The spontaneous ignition temperature of producer gas is about 570 degrees C,
but the hydrogen content does change this as you would expect. The key
factor is the temperature, not the air/gas ratio which surprised me when I
first saw this demonstrated last year.
In the presence of excess air the ignition didn't initiate until we had
630 degrees C on the gauge. The gas/air ratio only becomes critical when
the gas is cold as you experience with engines.
Another factor to consider in your research is that your hot gas is likely
to contain soot or char particles. These are always hotter than the gas
stream and could cause ignition when they come into contact with air.
Hope this is of assistance to your understanding.
Regards
Doug Williams
Fluidyne Gasification.
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