[Stoves] re Topic Changed: Working on biochar/heat systems (Gordon West)

Crispin Pemberton-Pigott crispinpigott at outlook.com
Mon Sep 4 20:46:43 CDT 2017


Dear Andrew and All

The continuous upfeed char makers seem to be common enough and work if the fuel is homogenized. Do you recall the discussion about the rice hull gasifiers in Cambodia that ‎feed rice hull in the bottom and pull char off the top? It was making gas to run an engine for mechanical power (large rice processing factory) and some electric power production to operate a few machines and lights. Tom Miles said there are more than 200 of them in Cambodia.

I remind the group of the work of Anton Soedjarwo at YDD (Yayasan Dian Desa) in Yogyakarta. He has a top loaded gasifier that can accept rather inconsistent fuel size and moisture. He is promoting it as a way to use empty palm bunch hands (EHB?).

‎The point is his system is: open the hatch and drop. Some in now and then.

Regards
Crispin


‎

On 4 September 2017 at 16:00, Ronal W. Larson <rongretlarson at comcast.net> wrote:
> Andrew and list:
>
> I have just sent you an invitation to the biochar list.  I can do so easily
> for anyone else. - let me know off list.

Thanks Ronal, I've rejoined
>
> To all - the stove list started off (1996) mostly on char-making stoves -
> before any of us had ever heard of biochar.  Andrew is correct that this
> list stopped talking about biochar on this list in about 2005 or 2006 -
> since by then the stove list was about equal on rocket and TLUDs.  Biochar
> discussion is now mostly about its soil improvement benefits (and only a
> little on CDR), although there is still a nice amount on char production
> (that can be helpful to stove folk). Thanks to both Gordon and Andrew for
> keeping this interchange alive.   It is natural that there should be some
> overlap from time to time.

Yes and Gordon's device reminds me of a  discussion with Kevin
Chisholm on [stoves] a continuous TLUD (I suspect  still using the
three letter acronym coined by Tom Reed in those days Inverted Down
Draught) using an auger to push the fuel up at the same rate the
pyrolysis from was moving down relative to the fuel. All with the aim
of co producing char and making use of the heat. Soon after the
biochar discussion group was formed

Later Alex English demonstrated  large scale co producing char from
his large wood chip stoker by restricting primary air and using the
combustion of the offgas to keep the combustion chamber and heavy
steel recirculating stoker chain  hot enough to pyrolyse wood chip
delivered onto it. Following his results I was able to run a 500kW Kob
woodchip boiler to similarly produce a lower yield of char without
impacting on its heat output too much.

Andrew

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