[Stoves] Charcoal from waste - home cooking or other markets? (Re: Crispin, Anand Karve)

Ken Boak ken.boak at gmail.com
Thu Oct 13 16:52:55 CDT 2016


Andrew & list

Hello again after a few years off.

I like the high thermal mass cyclone burner idea.

Pyrolyse the sawdust into char in a micro cyclone ( Think Dyson Root 8,
Root 12 technology - but cast in alumina refracory material)

Char drops into a hopper - pyro gases are separated and go to a burner to
keep the cyclones hot.



regards



Ken

On 13 October 2016 at 22:19, <ajheggie at gmail.com> wrote:

> [Default] On Thu, 13 Oct 2016 09:46:26 -0500,Paul Anderson
> <psanders at ilstu.edu> wrote:
>
> >Rebecca, I do not know of any "small, reasonable size" method to make
> >raw sawdust directly into charcoal.
>
> As I said Chardust in Kenya initially did it in a simple down draught
> burner.
>
>
> >Of course it can be done in
> >scientific laboratories, and probably in some expensive pyrolyzer-style
> >large burners at some sawmill that wants heat, or in some fluidized bed
> >gasifier that sprays in the sawdust (utilizing its small particle
> >size).  I hope that somebody has a brilliant idea someday for a small
> >inexpensive method, but not being done yet, as far as I know.
>
> There have been many ways to pyrolyse sawdust, I was told of one where
> the sawdust was metered into the exhaust of a diesel generator, I bet
> that made some smoke.
>
> One can envisage a simple vortex burner of high thermal mass being
> initially heated up by the sawdust and later the sawdust would
> centrifuge to the side and then down whilst the offgas burned  in the
> upper area, the radiant heat from the walls then further carbonising
> the sawdust as it fell.
>
> Alex has shown how a chip stoker can be set to produce char and make
> use of the heat, whether the char produced is marketable is another
> matter.
>
> In the Chardust case it looks like there is still lots of vendor's
> waste char fines which is easier picking than making fresh from
> sawdust.
>
> Andrew
>
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