[Stoves] Charcoal as space filler in TLUD reactors

[Paul Anderson]

Martin,

Concerning "space fillers", I and probably others have put wood chips 
and small pieces into TLUDs where there is otherwise too much space 
between the main biomass fuel pieces.   Yes, the chips do pyrolyze.

But my point is that making small pieces of biomass for filler can be 
difficult.   But using char pieces from previous TLUD batches is very 
easy.   But just do not expect to get much energy from the charcoal 
filler, because it has already been pyrolyzed.

Concerning your comment/question about measuring the flow of primary 
air, it is not sufficient to measure characteristics of the 
fan/blower/pump because the holes in the bottom of the TLUD are 
intentionally small and the fuel is intended to (expected to) block some 
of the flow.   What is needed is to measure the flow INSIDE the fuel 
cylinder, such as in the bottom 2 cm of fuel. But how to do that?

Paul

Paul S. Anderson, PhD  aka "Dr TLUD"
Email:  psanders at ilstu.edu   Skype: paultlud  Phone: +1-309-452-7072
Website:  www.drtlud.com

On 5/6/2013 3:56 PM, Boll, Martin Dr. wrote:
> TLUD-ers turn it as you want;
> Charcoal as space-filler means  __somehow__  that "mixed fuel" is used in a TLUD.  From that aspect it is a "hybrid-fuelled" TLUD.
> Change the ratio of the "hybrid-fuelled" TLUD  to:  wood-pieces as space-filler (by charcoal-packing). Run this different mixture and look.
> Who did this already? Interesting to hear about.
> - It would be as well interesting to know the difference in performance between test-runs with natural draft and with forced air.
>
> Even by that different ratio, the burn can be stopped after outgassing, to get as final result charcoal.
>
> - Hybrid-fuelled TLUDs would get probably a better quality of resulting charcoal  ( Frank, mentioned that as important difference for bio-char)
>
> P.S. We could stop guessing about the amount of more or less _primary air_ (caused by the minimal pressure of a fan or natural draft in different-dense TLUD-packages), and make an exact air-dosage by a rotameter, or less expansive and simpler by an aquarium-air-pump.
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> Martin
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