[Stoves] Burning wet wood

[Frank Shields]

Hi All,

 

If we were to inject a spray of moisture in (or after) the pri would that
result be the same? Are we sure it's the moisture IN the wood? For example
depending on the experiment and how the moisture was adjusted it may be the
water on the outside. Just making sure. : )   Perhaps due to slowing down
the pyrolysis or formation of particles. 

 

 

 

 

Frank 

 

 

 

 

From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of
Dean Still
Sent: Wednesday, June 12, 2013 12:43 PM
To: Discussion of biomass cooking stoves
Subject: Re: [Stoves] Burning wet wood

 

Hi All,

 

I find that pellets burn cleaner in TLUDs when at about 10% to 15% moisture
content like sticks of wood. In both cases a slower burn helps to meter the
fuel.

 

Best,

 

Dean

On Wed, Jun 12, 2013 at 12:22 PM, <rongretlarson at comcast.net> wrote:

Crispin, list etal

   This below may be true for "burning", but it has not been my experience
for pyrolysis.  Colorado is pretty dry and I never experienced a smoke
problem due to dryness.  I hope someone with a TLUD will "bake" some wood or
pellets for awhile and report their results.  If a fuel dryness problem
exists for TLUDs, it is not clear why that should be so.  During pyrolysis a
lot of water is created through numerous chemical reactions.

  Yes problems for wet wood with TLUDs.  Explicit detail is somewhere in
this list's archives.  Andrew H is expert on fuel wetness.

Ron

  _____  

From: "Crispin Pemberton-Pigott" <crispinpigott at gmail.com>
To: "Discussion of biomass cooking stoves" <stoves at lists.bioenergylists.org>
Sent: Wednesday, June 12, 2013 1:11:31 PM
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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