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

[Energies Naturals C.B.]

Dear Anil and others,

the low density gasification is very interesting.
A friend of mine, a ceramist, has develloped a unique way to recycle granite and slate waste from cutting and grinding into a very strong and resisting ceramic .
For this, she needs 1250 - 1300 °C. 
Do you know whether your described gasifyer-kiln combination can reach this high?

Our fuel would be low grade forest waste, coarsly shredded oak and pine branches.
The bulk density is around 100 - 150 kg. 

It would make a fine project if it worked!

Rolf



On Thu, 6 Oct 2016 16:55:00 +0530
nari phaltan <nariphaltan at gmail.com> wrote:

> Hi stovers,
> 
> It is very wasteful to convert agricultural residues to char in simple
> containers. The ensuing pollution and heat transfer makes it very
> inefficient. A better way is pyrolysis/gasification that we did long
> ago (1995). www.nariphaltan.org/Gasifier.pdf
> 
> Cheers.
> 
> Anil
> 
> On 10/6/16, Ken Boak <ken.boak at gmail.com> wrote:
> > Hi Teddy, Tom, List
> >
> > Thanks for that very useful link to the Thailand charcoal gasifier site.
> >
> > My interest lie in a simple low tech charcoal gasifier, and a conversion
> > aimed at the single cylinder Lister, Petter and Changfa type diesel engines
> > that are very common in India, Asia and Africa.
> >
> > I'd like to make a "magazine" that holds several briquettes,  like bullets
> > in the chambers of a revolver, and so even slightly damp, fresh biomass
> > briquettes could go through a drying stage, a pyrolysation stage - and once
> > completely converted to charcoal, a gasification stage.
> >
> > The dryer and pyrolyser are driven from the hot engine exhaust and
> > supplemented by burning the tars and volatiles - the pyrolysis gas.
> >
> > Separating drying and pyrolysation in separate chambers from the
> > gasification, means that the volatiles and tars produced in the pyrolysing
> > process can be kept completely separate from the gasification - and result
> > in a very low tar gas - which is more acceptable and forgiving to the
> > engine valve gear.
> >
> > Initial tests were conducted (spring 2012 at APL) in pyrolysing 3 litres of
> > woodchips (0.8kg) directly  with a Lister exhaust.
> >
> > These tests showed that complete conversion of  to charcoal could be
> > achieved within 45 minutes - just by direct action of the hot  Lister
> > exhaust through the container holding the chips.
> >
> > After 20 minutes of such direct heating action, the emerging gas was
> > sufficiently rich in hydrocarbons to sustain a flame.
> >
> > After 45 minutes there was no further smoke, and on examination I was left
> > with a fine charcoal similar to biochar - about 20% by volume of the
> > original woodchip sample. Whilst this might not appear a good charcoal
> > conversion efficiency - half of the charcoal fines were blown out of the
> > container by the pulsating Lister exhaust!
> >
> >
> >
> >
> >
> > Ken
> >
> 
> 
> -- 
> Nimbkar Agricultural Research Institute (NARI)
> Tambmal, Phaltan-Lonand Road
> P.O.Box 44
> Phaltan-415523, Maharashtra, India
> Ph:91-2166-220945/222842
> e-mail:nariphaltan at gmail.com
>            nariphaltan at nariphaltan.org
> 
> http://www.nariphaltan.org
> 
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Energies Naturals C.B. <energiesnaturals at gmx.de>