[Terrapreta] Folke's retort kiln

[folke Günther]

>
> My 200 l drum retort is too big for cooking. Really, I would like to find
> out how to control the process and store the extra gas for other purposes.

*Perhaps it would help if you lead the gasses through a Fishcer -Tropsch
catalyst <http://en.wikipedia.org/wiki/Fischer-Tropsch_process>? (Mainly
consisting of iron fillings)*

>
>
> Someone told me once not to complicate subjects when talking to simple
> folks. KISS, KISS ( Keep It Simple Stupid)
>
> We have no choice in audience on internet, but if we want to influence
> large
> numbers to become of active participants in applying TP for its many
> benefits, perhaps the experts should try hard to introduce KISS KISS
> technology and use KISS KISS communication. And a drum equals a bag of rice
> in cost here. That's a big investment when many earn less than that per
> month.
>
> Kind regards,
>
> Bakary Jatta
>
>
> Francoise Precy <f.precy at hotmail.co.uk wrote:
> >
> >
> > Hi everyone,
> >
> > http://www.holon.se/folke/carbon/simplechar/simplechar.shtml
> > Trying to piece things together and clear up my understanding. What got
> > said so far:
> >
> > On 27 May 2008 22:51:33 -0700 "Philip Small" wrote:
> > ?when the pyrolysis front advances "upwind", against the draft, and that
> > draft comes from below, it corresponds to the same principles as both top
> > lit updraft pyrolysis and reverse downdraft pyrolysis. The draft carries
> > smoke, generated between the pyrolysis front and the charcoal, across the
> > hot char to the flame.? This device is top-lit so we ?get some of this
> > effect.? ?The more he controls his Superficial Velocity (Source - PDF
> > http://www.woodgas.com/Superficial%20Velocity.pdf), the more benefit he
> > can get from this effect.? ?Only a toplit "stage 1" is a candidate (for
> > that effect).
> > ?after the initial batch burns down, (...) the retort is still putting
> out
> > woodgas?. When the fuel (is topped up), (the pyrolizing) does ?not
> conform
> > to the same effect.?  ?Superficial Velocity effects (affects?) the
> > pyrolysis gas temp as it closes in on the charcoal. ie slower SV cracks
> > more CO2, until it's too slow to keep the flame above the charcoal
> burning
> > red hot enough to radiate down (so as) to push the pyrolysis front
> > (advancing upwind, away from the charcoal). OK my head hurts now. -philip
> >
> > This gets me confused b/c I imagine the draft going down (towards the
> only
> > way out, so there is a downdraft inside that inner barrel), and the
> > flame(s) being mostly up albeit outside. Assuming that the pyrolysis
> > starts within at the top, is the pyrolysis front on top of the layer of
> > charcoal or underneath it?
> > If it's underneath, then the gases get 'filtered' mostly by the biomass /
> > wood etc, not by the charcoal. If the pyrolysis front is on top, which
> > doesn't make much sense to me so far, then the gases get filtered both by
> > charcoal and by biomass. Was seeing it underneath but Philip ain't the
> > only one who gets a headache from it, so by now I just can't work out
> > anything further
> > The only sort of sensible thing I can think of is a system of 3 barrels
> of
> > progressive sizes, the smallest (with a few small vents at the bottom
> > maybe) filled with wood / biomass, sitting upstraight inside the largest;
> > with the intermediary barrel turned over (bottom up) coming on top of the
> > smallest barrel. So the smoke would have to go through the charcoal, come
> > out by the top, go down the inner side of the intermediate barrel, and
> get
> > burnt on the outside of it.
> > One notable advantage as far as I am concerned: saves lugging full
> barrels
> > about (can't see myself lifting ? not dragging ? on my own 2 metal bins
> > with the smaller one full of wood). So allows for bigger batches than a
> > poxy 20 litres-sized one. Don't know about any advantage re. elimination
> > of gases.
> > Serious potential downfall: it'll probably take longer to heat up as the
> > fire is not in direct contact with the container that holds the wood.
> > Wonder if anyone's got any more precise idea on that point?
> >
> > ?Wok pan?:
> > 2008/5/27 Ron Larson wrote: ?enjira. This is a (delicious) thin sourdough
> > flat bread cooked on a homemade thick ceramic disk (a "magogo"), of about
> > 60 cm diameter.... this plate (disc) maybe sitting on top of the interior
> > can (barrel).?
> > Folke answers: ?when putting something flat on the stove, it easily
> starts
> > smoking (=incomplete burning of the gasses).? So it's not the
> > wok-pan-shape that's necessarily needed: if the 'plate / disc' is sitting
> > on top of the inner barrel without overlapping (too much) the gap between
> > the inner and outer barrel, the combustion of gases should still be
> > effective. May also raise the disc on 3 stones so it leaves a gap between
> > itself and the outer barrel's rim.
> > _________________________________________________________________
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> >
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> > End of Terrapreta Digest, Vol 16, Issue 96
> > ******************************************
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-- 
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----------------------------------------
Folke Günther
Kollegievägen 19
224 73 Lund
Sweden
Phone: +46 (0)46 141429
Cell: +46 (0)709 710306
URL: http://www.holon.se/folke
BLOG: http://folkegunther.blogspot.com/
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