[Stoves] Pyrolytic gasifiers

[John Davies]

----- Original Message ----- 
From: "Paul S. Anderson" <psanders at ilstu.edu>
>
> My question is:  When the unit has been started and is functioning 
> normally, the
> primary air will enter into an area of charcoal that was created in the 
> initial
> minutes.  Will the oxygen of the limited air be all or mostly taken up by 
> the
> hot carbon (becoming CO or CO2??), and will that favor or hinder the 
> desired
> pyrolysis  process of the remaining raw biomass?

Paul,

All oxygen present will react with carbon above about  400c to form  CO2.-
 exothermic reaction.- heat evolved  ~2X

When CO2 without oxygen comes in contact with carbon at
about 800c it will react and form CO -
endothermic reaction.- Heat absorbed ~X

If any oxygen comes into contact with the CO at high temperature
it will react to form CO2 - exothermic reaction -Heat evolved ~X

I don't have the exact temperatures and heat units at hand.

Hope this helps,
John Davies..