[Stoves] Burning wet wood

[Frank Shields]

Dear Crispin and all,

 

To cut-to-the-chase and avoid all the testing that likely means little or
endless interpretation of all the variables I am thinking a test on biomass
where you burn it and determine burn characteristics. 

Suggest making a series of pipes of different 'standard sizes' with metal
screen at the bottom. Add a known and established amount of fire starter
then tap in the fuel. With Boy Scout skills light the starter from below the
screen using one match and then monitor the progress of the combustion.
Could be temperature of the pipe, height of the flame for X duration,
completeness of combustion etc. all with natural draft.  This could better
predict how a specific fuel will work in a group of stoves. The pipes size
could be based on standard size of typical combustion chambers. One could
report 'Using standard pipe #2 this fuel gave the following characteristic:
Temperature profile along the pipe, temperature profile 30cm above pipe,
length of time to completion, Biomass left, smoke observed etc.' A simple
test anyone could do when describing the fuel used when testing and
comparing a group of stoves.         

 

Regards

 

Frank

 

 

Thanks 

 

Frank Shields

 

BioChar Division

Control Laboratories, Inc. 

42 Hangar Way

Watsonville, CE  95076

 

(831) 724-5422 tel

(81) 724-3188 fax

 <mailto:frank at biocharlab.com> 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 12:12 PM
To: 'Discussion of biomass cooking stoves'
Subject: Re: [Stoves] Burning wet wood

 

Dear Frank

 

Burning very dry wood is difficult and it makes a lot of smoke. That is why
stoves should not be evaluated with very dry wood when they are designed to
burn 'ordinary wood'.

 

If you get the conditions right for the early fire they are
double-guaranteed o be wrong for the late fire. Much better a continuous
input of damp material.

 

Regards

Crispin

++++++

 

 

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

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