Ron,
On 24/01/2012 12:35 PM, [email protected] wrote:
Alex and list:
This is to further explore the idea of char production in your
device (which we should call??).
We could call it the thinking-outside-the-box-stove stove:) Suggestions?
In the exchange below, I think I have to side with Crispin - is not
the fuel essentially all combusted? Of course it is the usual
two-step combustion - with pyrolysis first leaving a pile of char -
which is then itself more slowly combusted? As the char disappears,
more pellets are able to fall down. You seem to have established
stable rates of pellet and air flows such that the pyrolysis zone is
unable to travel up into the hopper.
A combination of forces are moving the pellets down and over while they
burn, completely.
The Venturi effect you mentioned is one drawing both pellets and
air down from the hopper - yes? (When I wrote yesterday I was
fixated on char movement.)
No, the venturi is the shape of pile at the end of the grate. It is not
a functioning venturi. The chimney effect draws the air.
My reason for still pursuing the char production possibility is
that your geometry seems very similar to the Dasifier (concept of Agua
Das - being ccd). Das tells me he can produce char. Somehow your
grate has to be replaced by one that allows char to fall through??
Is there any alternative then to an auger?
Air and gravity may be able to move the char enough to create a
continuous flow. As the pellets lighten during charring they are more
subject to the force of moving gasses. A bit f a long shot, but possible.
Might it make sense to replace the tall chimney in some
circumstances with a blower? (To lower first costs - allowing a much
shorter chimney?)
Yes.
Is this development related at all to backup heating of your
greenhouse? Or manly intended for home heating? Any applicability to
cooking?
No No this is pure science:) My first choice is to succeed with wood
chips as they are cheap and available and cordwood and chainsaws has
taken a toll on my old tendons and ligaments. Combustion processes are
adaptable to local needs and circumstances. I won't predict how they
will be used. I used Tom's TLUD camp stove to heat phosphoric acid to
clean a copper heat exchanger at the greenhouse last fall. It was
perfect for the job. Who'd a thunk.
Alex
Ron
[email protected]
*To: *"Discussion of biomass cooking stoves"
<[email protected]>, "Alex English" <[email protected]>
*Sent: *Monday, January 23, 2012 9:38:55 PM
*Subject: *Re: [Stoves] The upside of Down feed
Alex and list:
My interest is in the first several lines, which read:
Crispin: "This is interesting news. The grate looks great, and if
there is a pile of char that is maintained in front, we must conspire
to burn it."
Alex: "Not so fast. I rather like the idea of a naturally formed
biochar venturi:)"
RWL: I have totally missed the possibility of a char output in your
design. I can't even see a Venturi possibility.. Can you explain a
bit more on how that can be accomplished? Have you accomplished any
char preservation yet?
Thanks. Ron
------------------------------------------------------------------------
*From: *"Alex English" <[email protected]>
*To: *"Discussion of biomass cooking stoves"
<[email protected]>
*Sent: *Monday, January 23, 2012 6:45:36 PM
*Subject: *Re: [Stoves] The upside of Down feed
Dear Crispin,
On 22/01/2012 10:36 PM, Crispin Pemberton-Pigott wrote:
Dear Alex
This is interesting news. The grate looks great, and if there is a
pile of char that is maintained in front, we must conspire to burn it.
Not so fast. I rather like the idea of a naturally formed biochar
venturi:)
<snip remainder>
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