[Stoves] Burning wet wood

[Inversiones Falcon]

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 <frank at compostlab.com>
To: 'Discussion of biomass cooking stoves' <stoves at lists.bioenergylists.org> 
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
frank at biocharlab.com
www.controllabs.com
 
 
 
 
 
From:Stoves [mailto:stoves-bounces at lists.bioenergylists.org] 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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