Tag Archives: tlud gassifier

Coffee Husk Biochar

Biochar coffee husk question the Community helps answer

Biochar Coffee Husk

I approved this comment about 1 day after I asked the

question. It always amazes me how willing to help

most people are. So for Green Mountain Coffee folks I hope this gives you more to work with on your Project to Biochar coffee husks in Australia.

Comment from Paul Olivier Email him here

It is easy to gasify coffee bean husks in a top-lit updraft gasifier. But a small fan is needed to force air through the husks. I use a small 40 x 40 mm fan, and the speed of the fan is controlled by a speed regulator. The amount of power consumed by this fan in the gasification of coffee bean husks is generally less than one watt.

Virtually no smoke is created during the gasification of coffee bean husks.
Here are two pictures of coffee bean husk being gasified: Creating Biochar coffee husk.

Biochar coffee husk

Biochar coffee husk

Biochar coffee husk biochar gasifier for coffee husks

biochar gasifier for coffee husks




I did a similar experiment with much drier coffee husks, and I got a much bluer flame that what you see in these two pictures.
Of course I get a much better result gasifying rice hulls:

tlud gasifier for coffee husks Biochar coffee husk

tlud gasifier for coffee husks

closer look Biochar coffee husk

closer look

Here are some of the latest designs of my 150 mm gasifier:


Biochar coffee husk

Biochar coffee husk

All of these gasifiers are fabricated out of stainless steel so that they can be used over many years.

My 100 gasifier sells for about $30 US.
The 150 gasifier sell for about $50 US.

This is a totally non-profit effort.
I also design larger gasifiers of a 100 kW capacity.
Here equipment price drop to less than $5.00/kW.

For the larger waste management concept that I am promoting in developing countries, see:


This is a great resource and I would like to thank the author for his rapid response to a  Biochar coffee husk question.

Charmaster Dolph Cooke

biochar tlud gassifier Assembled 200 l TLUD

Tlud gassifier with awesome mods by Karl J. Frogner, PhD

Tlud gassifier

I love being a charmaster and I love having a website that people are happy to use. So to all you readers check this out…

Introducing the UB 200 l  natural draft Tlud gassifier oven 2 July ‘11

E, Dolph, aloha kaua-
Just came upon your web page and thought you might like to take a look at the modifications we made to John Rogers’ 200 l TLUD based on what little I know from a bit of reading of TLUDs.
I’ll send a set of pictures that should give you the basic idea if your page input allows me to, otherwise send me an email address and I’ll send them.
An extended set of pictures is available that I would be happy to send if you think they would help. We are calling it the UB 200 l  natural draft TLUD oven, or the UB T- oven  or t-oven for short. But please, please, please don’t call it a stove.


Biochar Tlud Gassifier Component parts of 200 l TLUD

Biochar Tlud Gassifier Component parts of 200 l TLUD

1 of 5 Component parts (l to r):

1.Primary air chamber with adjustable slip ring intake ports;
200 l feedstock chamber;
afterburner (also with adjustable slip ring intake ports) with chimney.

Biochar Tlud Gassifier Chimney damper

Biochar Tlud Gassifier Chimney damper

2. Chimney damper
Only a power drill and a power grinder are needed to make the design, although the student who was doing the work had access to a welder and used it to put the handles on the slip rings on the primary air & afterburner air, the male slip coupe for the chimney and the handle for the chimney flue. Easy workarounds could be used if welding is a problem.
I’ve run two trials so far, both with cow manure that was air dried after being shoveled out of the cowshed. Both runs were smokeless. The first, in which hand to 20-30 x 20-30 x 5-10 cm sized on down burned down in 55 min, the second that was filled with fairly uniform 7-10 x 7-10 x 5-10 pieces together with the fins from chopping up the larger pieces burned down in 1 hr 40 min. The charing was compleat throughout the charge, slightly oily on the rub to the hand rub test.
Another run was made (I was absent) using birch branch & twigs segments (2 cm on down) about 10 cm long. They had smoke problems with keeping the afterburner lit in an exposed site on a windy day, but the char came out good. Devising a wind shield should not be much of a problem.
biochar Tlud Gasifier Primary air hole pattern

biochar Tlud Gasifier Primary air hole pattern

3: The circled square pattern of 45 holes, each 13 mm in diameter.
We are very interested in developing these large TLUDs for getting serious amounts of biochar into the ground, leveraging smallholder benefits of biochar in sustainable rural development into timely climate change mitigation. We are thinking of initiating another sib-project based on a virtual community of low-tech biochar producers, TLUD designers and tinkers who would want to test and improve the design. Joining might be a good sub project for your Biochar Project or any of your interested readers.
Me ke aloha-frog
biochar tlud gassifier Assembled 200 l TLUD

biochar tlud gassifier Assembled 200 l TLUD

4. Assembled 200 l TLUD
biochar tlud gassifier Burn line at 20 min

biochar tlud gassifier Burn line at 20 min

5. Burn line 20 min after spreading starting fire coals
and putting afterburner/chimney in place.
(Coals were spread 10 min after igniting starting fire)
Note smokeless burn

Karl J. Frogner, PhD, OZP
President & Project Development Head; UB International (UBI)
Project Development Head; Mongolian Biochar Initiative (MoBI)
Project Development Consultant; Thai Biochar Initiative (ThBI)
Project Development Head; UBI Hawaii (UBI Ha
Member, Advisory Committee, International Biochar Initiative (IBI)
47-481 Ho’opala St.,
Kane’ohe HI 96744 USA
Hawaii:  1-808 234-3486
Ulaanbaatar:   976 9600-3688
Bangkok:   085 328-3731

I am so very happy to see our biochar project family extending to all corners of our planet. Yes I know it is impossible for a round planet to have corners:P.
Thank you Karl and thank you to your assistant(s) for inspiring sustainable biochar, Reusing, Refashioning, Repairing, Reinventing and of course sharing (Y)our Biochar Project with the world.
If you folks are ever in Australia come stay with me for a visit and I will treat you like the royalty you are. On behalf of Biochar Industries, Biochar Project and Biochar enthusiast the world over we salute you.
Charmaster Dolph Cooke