"It is known that carbon interaction with carbon dioxide with the formation of carbon monoxide that enters into the reaction with oxygen at a certain distance from the particle surface turns out to be the limiting stage governing the rate of combustion of coal particles in a high temperature medium".
Computation of the rate of high-temperature interaction of carbon with carbon dioxide.
I have noticed that it takes much less time for the flare to sustain a woodgas flame using the charcoal from the previous run instead of starting with a new batch of charcoal. In the cases of new charcoal I have been filling it with larger chunks (~<2.5in) of charcoal that have been sieved above .25 inches. I believe that the smaller char particulates from the previous run are able to get up to temperature faster to promote the CO reaction and they increase the surface area for the reduction reaction in the char bed.
The last time I started the reactor it took about 5 minutes to sustain a woodgas flare. It seems like it has taken twice as long in cases when particle sized <.25 were sieved out.
char particle distribution and start-up time
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