Re: --- Horizontal bed kiln #kiln

Mark Ludlow

Thank You, very much, Nando!



From: on behalf of Paul S Anderson <psanders@...>
Sent: Wednesday, March 4, 2020 3:00 PM
To:; Nando
Cc: Anderson, Paul
Subject: Re: [Biochar] --- Horizontal bed kiln



It has been many years since we corresponded directly about pyrolysis and TLUD cookstoves.   It seems that you have been very very busy and with substantial results.


Without giving away any sensitive information, could you please provide a bit more info than what is on your excellent website:    (or point me to where that info is at.)


You wrote:

Our base capacity unit will process about 550 kgs of wood chip per hour (dry weight basis) 690 kgs @ 20% moisture content, producing 170 liters of dilute wood vinegar (4% acetic acid), 165 kgs of char, and 500 kw of chemical energy in the syngas stream.


1.  That is about a half ton of dry chips or 2/3rd ton of air-dried chips per hour.  Could be 12 to 16 tons per 24 hour continuous operation.   With 20% biochar yield, that would be 2.4 to 3.2 t of biochar per full day. 

I assume that  there is a moving drag-chain.  Do you sometimes stop the  movement if sensors indicate?


2.  About the chemical energy in the syngas stream, I assume that the “raw” gases coming off of the final chamber (the pyrolysis area) are essentially woodgas (without much moisture because of the two previous sections).   The clean-up of woodgas to become a syngas stream is  important, but it is not the fundamental processing done by your horizontal bed kin (Or is it?)   Can you please tell us more about getting those off-gases into good condition to run engines for electricity generation?  (or simply say that you have a proprietary process.)  


3.  Please give some indication of costs of fabrication (prototype costs vs. expected line-production costs will be quite different;  a range would be userful).   My purpose is to have your system in some general “ballpark” range.   Multi-millions of dollars per unit is far different from “under $800,000”  or some other guideline/target.   This can then be contrasted with the costs of rotary kilns.  Thank you for pointing out the major differences with rotary kiln.  


Disregard any questions that are too sensitive to discuss.  


Congratulations!!!   And best wishes for success.    Can your first unit be visited in upstate New York?   (as of when?)




Doc / Dr TLUD / Paul S. Anderson, PhD --- Website:

     Email:  psanders@...       Skype:   paultlud

     Phone:  Office: 309-452-7072    Mobile & WhatsApp: 309-531-4434

Exec. Dir. of Juntos Energy Solutions NFP

     Go to:  to support woodgas (TLUD) projects

     incl. purchase of Woodgas Emission Reduction (WER) carbon credits

     and please tell you friends about these distinctive service efforts.

Author of “A Capitalist Carol” (free digital copies at

     with pages 88 – 94 about  solving the world crisis for clean cookstoves.


From: <> On Behalf Of nando via Groups.Io
Sent: Sunday, March 1, 2020 4:34 PM
Subject: Re: [Biochar] Biomethane Report - California #bioenergy #AD


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On Sun, Mar 1, 2020 at 03:17 PM, Ron Larson wrote:

I haven’t heard much of your own recent biochar work.  What’s happening for you?

We're developing a horizontal bed kiln, the prototype is nearly ready for testing in upstate New York ->
It's generating a lot of regional interest. John Schwarz informs me that he is running from one meeting to the next. 

At the moment, I'm translating the documentation for the Stockholm biochar urban plant bed project from Swedish into English to place here (text is also on the way) as part of a general effort to document a variety of biochar / wood vinegar scenarios as completely as I can. I was in Stockholm to see this project first hand and was very impressed to see how successful it is. I'm informed that it is being replicated in other part of Sweden, particularly in Uppsala (just north of Stockholm), where they are using the biochar structural soil under the roads to increase the storm water retention capacity to 100 year floods. I hope that having the documentation and construction drawings will help other cities to replicate this project. 

AD systems are on my list to research more fully, particularly as we have a dairy farm with a digester 4 miles away from the plant location. We already have an AD research project in the planning stage with someone at Cornell, which is also close to the plant location. 

So far, I've managed to read "A review of biochar properties and their roles in mitigating challenges with anaerobic digestion" (very good paper)
and "Biochar increases biogas production in a batch digester charged with cattle manure"

So, back to translating ... 
Nando Breiter
CarbonZero Sagl
Astano, Switzerland

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