Dear all: I think someone can design a device to store wood and reuse the heat
to dry the wood, the owner must cook the first day with dry wood, after that
they will have dry firewood every day, for example a box to store up to 25
pounds of wood at the base of the chimney might work. I´ll tried to do
something as soon as I can.
Best regard
Gustavo
El Salvador
________________________________
From: Frank Shields <[email protected]>
To: 'Discussion of biomass cooking stoves' <[email protected]>
Sent: Wednesday, June 12, 2013 11:47 AM
Subject: Re: [Stoves] Burning wet wood
Dear Crispin, Tom and all,
I would think a batch mode would be better. A continuous mode means you have
water vapor all the time. In batch mode one would heat and find the gas
temperature goes to 100c. Then when the water is finally burned off the
temperature rises and you can then push the fuel forward to do what you want to
do with the now dry wood. Not sure this happens and have not seen a graph of
this but think this is what would happen.
Frank
Thanks
Frank Shields
BioChar Division
Control Laboratories, Inc.
42 Hangar Way
Watsonville, CE 95076
(831) 724-5422 tel
(81) 724-3188 fax
[email protected]
www.controllabs.com
From:Stoves [mailto:[email protected]] On Behalf Of
Crispin Pemberton-Pigott
Sent: Wednesday, June 12, 2013 9:05 AM
To: 'Discussion of biomass cooking stoves'
Subject: Re: [Stoves] Burning wet wood
Dear Dale
I believe it is easiest to burn wet wood in a continuous feed fashion. I have
had some recent experience in Indonesia trying burn wet (pretty damp) wood in a
TLUD. Some TLUD's heat pretty much all the wood at once (they vary). When that
happens there is a huge burst of moisture in the emissions. This is visible on
the HPT data quality check chart as depressed∑O2 and ∑CO2 lines (they should
depress in synch). The evaporation of all the moisture early makes for problems
later because then the wood it so dry it won’t stop self-pyrolysing. In other
words if combustion conditions favour wet wood, later they do not favour dry
wood remaining.
Tom has some experience, as does UK-Andrew in burning pretty wet biomass. The
essential point is to keep the primary combustion zone hot enough to run the
fire and still evaporate all that moisture. Heat recycling is by far the
easiest way to do that.
Good to hear from you. Any recent experiments to repot? I have missed your
great lab work.
Regards
Crispin
+++++++
Have we ever looked at the question of how to design a stove to burn wood that
is higher in moisture? It would seem that this is very important practical
issue, and that a stove that could burn wet wood would be very popular. What
makes a stove burn wet wood well or poorly?
The only time I remember someone saying something about this was Crispin, who I
believe said recently that preheating the primary air makes it possible to burn
wetter wood. This would be easy with a batch stove, harder with continuous
feed. Other than that, I can think of a couple things that might help burn
wetter wood.
Dale Andreatta
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