[Stoves] Carbonizing coffee husks etc., 3 designs

[dr.adam]

Dear Stovers,for CARiTAS-SWiSS / Ethiopia i was developing some units to carbonize coffee husks. The char will be briquetted. (ECOCOFFEE CHARCOAL )
I designed 3 different low-cost units.2 of them we already built, and they work well.If anybody is interested in them- contact me. 
I assume they will work with rice husks, etc. too.CheersChris ADAM
They are all built on the base of oil drums and built with locally available materials 
They all work kind of smokeless and with clear and clean combustion of the off-gas.

* Open-PitDrum Carbonizer,  it works on the down-draft system and needs continuous attention, about 1/2 oil drum of char can be produced per one hour. (see photo)

* Drum-RetortCarbonizer, it works as a batch system. Carbonization in about 3 hours.
 
*  RotatingDrum Carbonizer it works on the base of an exchangeable closed oil drums (retort system). The drum is turning by hand or by a motor. Drawings available, not yet built.

Coffee char made by the  Open-PitDrum Carbonizer within about one hour,  ( 1/2 oil drum)



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adam + partner
Appropriate Technologist + Industrial Designer

Box 10 10 17, Addis Abeba, 
E T H I O P I A

Mob:  +251- (0) 94 550 1215
(Mob: +49-(0)175-528 96 24, German Telekom does not always work in Ethiopia!)

www.biocoal.org
scda2 at ymail.com
 

    On Tuesday, 28 June 2022 at 00:45:53 GMT+3, Richard Stanley <rstanley at mind.net> wrote:  
 
 Rok, Good to hear from you! Thanks as ever for your work on finding practical ways to extend the life of ceramic liners . Its an issue which has promised alot of folks as much -in terms of thermal insulation and resulting thermal efficiency as it frustrates-in terms of your mentioned issue of low structural durability. Do you find it easier to use a cubic shape for the clay sand exterior? I wonder because , it seems that a simple cylindrical form would be easier to shape and use less material and still be  as effective as a thermal ‘ cushion given the cylindrical shape of the rocket stove itself .
Richard Stanley

Sent from my iPhone
On Jun 27, 2022, at 7:46 AM, Rok Oblak <rok.stoves at gmail.com> wrote:

Dear stovers,
it's been a long time since I've written in the list, but we recently organized a Building with Earth workshop and one detail in the cob table was an integrated cooking stove - a ceramic liner, using biomass briquettes, same type as from Richard Stanley. 
It showed up as a great update to the holey Roket stove https://briquettestoves.com/ as durability is a big issue as ceramic liners tend to crack and break pretty easily due to temperature shocks, but the cob here is making it last for a long time. 
I have mixed local found clay and a lot of fine sawdust in the liner and it doesn't make any smoke, only when you push in a new briquette, there is black fumes for a few seconds, until a new one ignites.
If you happen to know any projects this principle would be good to integrate, even for other types of wood, I would be happy to share my experiences and possibly collaborate on redesigning existing stoves with this alternative solution. 
Happy and healthy cooking!Rok

-- 
Rok Oblak, MAA Design

rok.stoves at gmail.com
briquettestoves.com

Gregorciceva ulica 5
4224 Gorenja vas
Slovenia
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