[Stoves] Fan-blaster Combustors / Trickle-fuel

[Paul S. Anderson]

Crispin,

Yes, the T-LUD has MUCH more fuel in it.  The fan-blaster trickle-fuel (FB-TF)
is a vastly different combustion type.

Also, the bottom remains cool in the T-LUD while the pyrolysis zone gradually
descends through the fuel.  In contrast, the FB-TF units have all the heat at
the bottom all the time.

And a NEW observation.  I finally unpacked the Reed Woodgas Campstove that I
took to Stove Camp 2006 and used there in its fan-blaster mode.  What I found
inside was a significant pile of metal scales (exfoliation, spalding, 
flakes). It must have come from the bottom and sides of the unit.

Interpretation:  The FB-TF mode of operation is continually making the 
fuel into
charcoal and then also consuming the charcoal.  The heat is therefore akin to
that of a forge with air blowing into a pile of red-hot carbon.  This is not
good for metal that is in close proximity (or in direct contact, as in the
fan-blasters).

A ceramic fan-blaster or one with protected metal (coated with furnace cement,
for example) might have a chance at survival, but I suspect that the the metal
interiors of the metal fan-blasters will not last very long.

Note:  The Reed and Philips stoves have lateral holes (only about 12 spaced
around the 4 inch-diameter fuel chamber) near the bottom for the major air
flow.  In contrast, the Woodflame Gusto stove has a perforated bottom (many
holes, perhaps 40??) so the entering air might slightly protect the floor of
the Gusto unit.

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:
http://bioenergylists.org/contributors#Paul_Anderson


Quoting Crispin <crispin at newdawnengineering.com>:

> Dear Paul
>
>> My main point is that T-LUD and TF (or T-F) are distinctly different
>> types of combustion.
>
> Would you agree that they are different types of operation?  If the fuel
> quantity is small, the combustion is about the same.  If the T-LUD has a lot
> more fuel in it, I lean towards its being different but I have not crossed
> the line yet...
>
> Regards
> Crispin
>
>
>
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