[Stoves] Charcoal as space filler in TLUD reactors

[Ron]

Martin

  Thanks for the input.  Two additions.  

    A.  The use of char to turn any batch stove into a double fuel stove is mainly to enable the use of small crooked sticks than otherwise couldn't be used at all.  There has been an implication that if some of the char is consumed, that is a loss in efficiency.  Not true.  Efficiency shouldn't change much as energy reaches the pot from char rather than wood.  It will hard to pick out a char joule from a wood joule.  No test results yet?

      B.  I really like york idea of the aquarium pump, but ask you and others knowledgeable on fans, blowers, pumps what might be the downsides.  Where AC electricity is no problem, and one has such pumps (I have several), can you describe a scheme to both vary the output and measure the air flow quantities?  

      A few years ago, Andrew Heggie gave me a small homemade $1 or $2 device to do this.  Anyone found such in local hardware stoves?  Wall dimmer switches?  A single speed device won't tell us enough.  Knowing quantities of air flow would be a big help.

Ron

On May 6, 2013, at 2:56 PM, "Boll, Martin Dr." <boll.bn at t-online.de> 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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