[Stoves] Hensel Paint Can Gasifier Stove

[Paul S. Anderson]

Andrew and all,

I am way behind on my stoves readings.  But I found your comment that deserves
as reply.

Quoting AJH <list at sylva.icuklive.co.uk>:  (snipped)

> Yes if the secondary air holes are angled tangentially and down the
> flame is held in a central vortex ... snip..., I make do with 3
> holes [using short tubes]. Increase the air pressure and you don't 
> need the primary air.
> Also then the char burns nearly concurrently with the pyrolysis
> offgas.

The above configuration does work, but there will be problems if the 
fuel column
is tall, meaning that the surface would be getting lower and lower away 
from the
entry of the air jets.  Increasing the force of the jets of air could 
compensate
for the increased distance (perhaps).

By not needing the primary air (the air coming in underneath the fuel), 
it is no
longer a TLUD operation.  What is actually doing the "primary air" work 
is part
of the air coming in from the top with a downward angle.

This is actually a large part of how the Philips stove works.  There is some
primary air from below, but the incoming "secondary air" from above is also
consuming the char that is created.  The Philips stove is NOT tall, and the
fuel level is not receding.  Instead the fuel level is maintained by 
constantly
(at 1 to 3 minute intervals, I believe) manually dropping in additional pieces
of fuel.  I wrote about that as "Fan-blaster combustors...." found at:
http://www.bioenergylists.org/en/search/node/fanblaster

Andrew, your work confirms that such systems function.  In fact, I 
would not be
surprised to learn that you did your experiments before the Philips 
people even
got started.  Great minds run on the same tracks (but with different
schedules?).  Lately I have thought that "air-jet" is a better name than
"fan-blaster."  But I leave that name to others as long as they do not call it
a TLUD.

The Hensell Paint Can Stove seems to be an excellent example of TLUD 
principles.

Paul

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