[Stoves] Charcoal Rocket Stove, Charing in a "low-cost retort kiln" ICPS

[AJH]

On Mon, 11 Jun 2007 08:55:30 +0200, Crispin Pemberton-Pigott wrote:

>With charcoal making, there is enough heat available in the biomass 
>volatiles that there may be no need to light a fire more than once in the 
>beginning.

This is how Yury first described the technique to this list, he  had
his inverted drums over a manifold that took the offgas back upstream
of the "pyrolysing" room and burned it so all the combustion products
bathed the drums with heat. He then sequentially removed and replaced
drums with freshly loaded ones.
>
>I foresee two problems: the drums will vanish in the hot, oxygen-rich air 
>after a few 'rounds' 

Yes this does appear to be the problem, the drums are subjected to
full temperatures of the offgas flame and they have to transmit all
the heat necessary to cause the pyrolysis through their walls. So the
compromise is between cutting the heat transfer by lowering the
temperature in the "pyrolysis room" or having the drums suffer.


>and there might be a massive, unexpected  production of 
>unburned combustible gas somewhere in the middle of the system after it gets 
>going.

Yes the curve of production of offgas is peaky and with a long tail,
Yury evens this out by swapping drums every few hours.

AJH