[Stoves] Changing rate of pyrolysis front in TLUDs

[Dean Still]

Dear Paul,

I have observed in T-LUD stoves that it is the reduction of air feeding the
fire, both primary and secondary, that controls the gasification process. So
if very little air is allowed into the fire then the height of the chimney
above the fire will have less effect if air drawn into the fire continues to
be limited. Is this how you envision the process?

If too much air is drawn into the batch of wood gasification stops and
direct combustion begins which creates smoke, etc...

Best,

Dean

-----Original Message-----
From: stoves-bounces at listserv.repp.org
[mailto:stoves-bounces at listserv.repp.org] On Behalf Of Paul S. Anderson
Sent: Sunday, April 15, 2007 12:26 PM
To: Crispin Pemberton-Pigott; Discussion of biomass cooking stoves; Crispin
Pemberton-Pigott
Cc: Stoves
Subject: Re: [Stoves] Changing rate of pyrolysis front in TLUDs

Crispin,

Quoting Crispin Pemberton-Pigott <crispinpigott at gmail.com>:
>
> Conclusion:  It is not unreasonable to expect that the burn will remain
> nearly constant throughout the cooking. Also, variations in fuel moisture
> will have far more effect that any change in draft.

That conclusion matches closely what we observe in the TLUD operations. 
  Andrew
mentions his interest in much taller TLUDs.  When I get taller TLUDs
constructed, I will certainly look to see if the pyrolysis-front rate
changes
between the initial and final times in the batch.

Paul


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