[Stoves] T-LUD heat feedback. Was: Particles and particle types

[Paul S. Anderson]

Quoting AJH <list at sylva.icuklive.co.uk>:

snipped
>> I am investigating the poor heat feedback of the top lit
>> approach with an aim to recuperate heat to make the thing self
>> sustaining at high (70% mc wwb) moisture levels without support fuel.
>> It's a follow up to the ideas we used in our high speed wood dryer.

Andrew,

Your description of your work was highly interesting.  I need some 
explanations
so that I can accompany it better.

1.  Heat feedback in the T-LUDs:  can you please restate/describe that and say
what is strong heat feedback or the overall objective.  I assume it is more
than just pre-drying the fuel by using the flue gases.

2.  Tom Reed has reported T-LUD operation with 30% moisture content.  
Do you or
others have experience with higher MC, such as 50% or 60%?   70% is so
fantastically high that success in your work would revolutionize our views of
fuels and stoves/furnaces.

3.  Please send a description and results of your high speed wood 
dryer. Specifically, is it applicable for chips, chunks, and/or cord 
wood?

4.  If the T-LUD pyrolysis gases are in with such vast amounts of water vapor,
what are the prospects or requirements for successful combustion of the gases?

(You might want to create new Subjects/threads so that we can discuss the
separate issues.  Similarly, I hope that the thread on "Particles and particle
types" can be continued and actually stay close to that subject.  Sometimes I
loose interest in a long-time thread without realizing that the topic has
gradually shifted to something that would be of interest.)

Thanks,

Paul
-- 
Paul S. Anderson, Ph.D., Geography professor - Emeritus
Telephone:  USA-309-452-7072 (residence and office)
Internet site:  www.ilstu.edu/~psanders
For my gasifier stoves info, go to:
http://bioenergylists.org/contributors#Paul_Anderson

>
> Recently I have been trying to burn very wet material with green
> foliage just to see what the possibilities are. I have air control
> with a centrifugal fan (12V for pumping up air beds) and I sample
> exhaust temperature just below the entry to the flue pipe. This
> material will not burn at all cleanly until some char is formed, then
> the char will provide all the heat to dry and pyrolyse the rest of the
> sample but the offgas and steam will not ignite, so essentially it
> smoulders away producing loads of whitish blue smoke, a mixture of
> sooty pics, water and tarry condensates. I can add some propane
> support fuel under the firebed. I add just the minimum amount to
> sustain a flame and a visibly clean exhaust. In the early stages the
> propane contributes a lot of the heat energy but over time I can
> reduce it and still maintain 700C (note this may well be an under read
> temperature) as measured by my digital multimeter and a K type thermo
> couple. I am investigating the poor heat feedback of the top lit
> approach with an aim to recuperate heat to make the thing self
> sustaining at high (70% mc wwb) moisture levels without support fuel.
> It's a follow up to the ideas we used in our high speed wood dryer.
>


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