[Stoves] RE Central channel combustion stoves. Was RE: HensonCenterFiure Burner System

[Paul S. Anderson]

Quoting Dean Still <dstill at epud.net>:
(snip)
> What I can't figure
> out is why CO is burned out more successfully when using a batch of charcoal
> compared to wood. At times, as can be seen in the graph that Tom posted, CO
> goes down close to zero. And almost no particulates as usual...
>
> Charcoal burns cleaner than wood, keeps going, needs almost no tending. Too
> bad 2/3 of the energy in wood is lost making it!

Stovers,

Wood CAN be burned cleanly with little CO.  The data below is extracted 
from the
Stove Camp 2005 results (full results are available at:
http://bioenergylists.org/stovesdoc/ethos/2005camp/hood%20summary_8_30_05.xls

see lines 24 to 27 of that spreadsheet.

I have extracted the data from 2 Rocket stoves and the 2 tests of Paul's one
stove.  Paul's stove won the Cat Pee Award for clean combustion and is now
called the "Champion Stove" and it uses the T-LUD gasification/combustion
technology pioneered by Tom Reed.  See the data, then I discuss it in relation
to the topic of CO burning and Dean's quote above. (I hope the formating of
your e-mail will retain the display.  Sorry if it does not.)  The difference
between tests Paul 1 and Paul 2 is that Paul 1 was without a chimney (the pot
is in direct contact with the flame and had a skirt) while Paul 2 was with a
chimney and used a small "plancha-type" body where only the pot bottom had
contact with the flame.

Carbon Monoxide Emissions:	          Ken's   WFP     Paul 1    Paul 2
CO to Boil 1 Liter of Water	  g/Liter	  0.69	0.68	0.33	0.19

CO to Simmer 1 Liter 45 min. g/Liter	  1.10	1.80	3.16	2.32

CO to Cook 1 L (total)	  g/Liter	  1.79	2.48	3.49	2.51

1.  I operated the Champion stove both times.  The BOIL part was exclusively
with the pyrolysis stage of the T-LUD operation.  The CO is less than 
half that
of the Rocket examples.  I do not know if the T-LUD technology can get the CO
any lower, but I will test it again at Stove Camp 2006.

2.  The SIMMER part was more complicated to interprete because extra 
wood pieces
were occassionally placed in with the burning of the charcoal.

3.  Because it is possible to remove the fuel container with the created
charcoal (and continue the Water Boiling Test (WBT) with another batch of fuel
using the same pyrolysis process),

    a.  The entire WBT could be done with the pyrolysis stage of the T-LUD
processes, with the "CO to Simmer for 45 minutes" possibly as low as 0.60,
resulting in the TOTAL CO to be under 1.00 g/liter.

AND/OR

    b.  The charcoal could be used immediately (or saved for later use) in a
stove that is optimized for charcoal burning.  I do not know if the basic
structure of the Champion stove or of any T-LUD device could be improved
specifically for the charcoal burning phase.

-----
What are the comparable figures from tests of charcoal stoves for boil and
simmer and total?  If already posted, please direct me to them.

Paul
-- 
Paul S. Anderson, Ph.D., Geography professor - Emeritus
Telephone:  USA-309-452-7072 (residence and office)
Internet site:  www.ilstu.edu/~psanders
For my gasifier stoves info, go to (below) and click on my name:
http://www.repp.org/discussiongroups/resources/stoves/contributions.html

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