Re: charcoal stove

[AJH <andrew.heggie@dtn.ntl.com>]

On Tue, 04 Jun 2002 02:42:28 -0700, "Kituyi, Evans"
<E.KITUYI@CGIAR.ORG> wrote:

>RE: FARM WASTE CHARCOAL STOVE
>
>I commend your in your efforts in finding cheap energy for the poor. 
>
>I would like to produce charcoal from farm waste e.g. coffee husks and would
>really appreciate if you have any information on how I could obtain a
>machine which could convert farm waste to charcoal. I would also like to
>know the process of doing so.

I suggest you look through the archives linked from the CREST site 
http://www.crest.org/discussion/stoves/current/ if you do not see this
reply on the list.

The two Karves in India have a simple system doing this from an
initial idea from Yury Yudkevich from Russia.

In essence the method is to pack dry agriwaste into drums and seal the
top except for a small vent. This is then loaded upside down into a
(preferably) enclosed large stove which is lit.

The heat from the stove brings the biomass in the stove up to
temperature at which point offgas is driven out of the drum at the
bottom and ignites, augmenting the heat from the stove and further
cooking the drum. Once evolution of offgas is finished the drum is
placed still upside down in sand to cool.

The offgas being forced to exit at the bottom of the drum means both
that its heat is used to heat unreacted biomass in the drum as it
passes down through it as well as the flame at the vent then heating
the drum above it.

A friend using one of my woodchip burners (internal capacity 700
litres) reports successfully making charcoal with seasoned wood by
this method, a 200ltre drum charred in 2 hrs.

Another method with dry particles which may be simpler for coffee
husks is a large idd kiln. Alex Engish did some work on this and I
have successfully used one up to 100 litres capacity. Whilst this
method has the advantage of needing no support fuel, yields are lower.

Both methods are cheap, fast and flare offgas cleanly.

AJH

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