[Gasification] small scale charcoal making design

[Benjamin Domingo Bof]

Doctor Thomas B. Reed, all beginners makes the same error . When we start to make charcoal with FAO 41 see one photo in Africa showing horizontal steel drum with liquid tube collector. We make charcoal with many problems. 
  Horizontal drum is very difficult to seal then any air inlet mantain inner fire with risk of charge losses. We go to region where coalmakers work and they suggest to use steel drum vertical placed. We make this and using three inches diameter firewood with an hole two inches in bottom center gives very good results. 
  Our intention is to remake this project using cyclone to liquid recovering to use this in horticultural pests control. Another design is use 2,5 HP motor ethanol gas sniffed from distill column and exhaust gases sended to charcoal drum to obtain positive pressure and neutral gas to improve pyroligneous liquid.
   
  Regards; Benjamin Bof

Thomas Reed <tombreed at comcast.net> escribió:
  Dear Jim:

But fire on the top, fresh wood on the bottom is best of all and gives a 
good yield of charcoal (20-30%) PLUS a very combustible and very steady 
operation, since each layer of wood has to heat the next one below. 

TOM REED BEF

jim mason wrote:
>> Here's the instructables method of feeding the smoke back into the fire:
>> http://www.instructables.com/id/How-to-Make-some-Charcoal/
>> 
>
>
> here is a nice design for a small scale retort type charcoal maker.
> this is an improvement on the classic 55 gal drum charcoal retort as
> the volitile gas out pipe is buried in a wood fire, so the smoke is
> burned even before it is flammable by itself.
>
> the smoke problem on charcoal makers is during startup, when the smoke
> is mostly steam, and thus not flammable. you need to vaporize all the
> water out of the wood before the gas quality will get reasonably high
> and burn. in practice, there will nearly always be some combination
> of steam and tarry pyrolysis smoke. and the transition to an
> adequately energy dense gas to burn can be long, and the smoke
> produced voluminous.
>
> a retort design like the above is much more controllable than a "fire
> in the bottom and raw biomass on the top" design. such are famously
> smoky. properly started, this design can make charcoal without nasty
> smoke.
>
> better insulation, flue gas control, and temp sensors could be added
> for controlled temp char making.
>
> jim
>
>
> 

-- 
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