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Ron,<br>
<br>
On 24/01/2012 12:35 PM, <a class="moz-txt-link-abbreviated" href="mailto:rongretlarson@comcast.net">rongretlarson@comcast.net</a> wrote:
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<div style="font-family: Arial; font-size: 12pt; color: rgb(0, 0,
0);">Alex and list:<br>
<br>
This is to further explore the idea of char production in
your device (which we should call??). <br>
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We could call it the thinking-outside-the-box-stove stove:)
Suggestions?<br>
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<div style="font-family: Arial; font-size: 12pt; color: rgb(0, 0,
0);"><br>
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.
<br>
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A combination of forces are moving the pellets down and over while
they burn, completely. <br>
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0);"><br>
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.)<br>
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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.<br>
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0);"><br>
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?<br>
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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.<br>
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Might it make sense to replace the tall chimney in some
circumstances with a blower? (To lower first costs - allowing a
much shorter chimney?)<br>
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Yes.<br>
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0);"><br>
Is this development related at all to backup heating of your
greenhouse? Or manly intended for home heating? Any
applicability to cooking?<br>
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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.<br>
<br>
Alex<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
Ron
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<div style="font-family: Arial; font-size: 12pt; color: #000000"><a class="moz-txt-link-abbreviated" href="mailto:ongretlarson@comcast.net">ongretlarson@comcast.net</a><br>
<b>To: </b>"Discussion of biomass cooking stoves"
<a class="moz-txt-link-rfc2396E" href="mailto:stoves@lists.bioenergylists.org"><stoves@lists.bioenergylists.org></a>, "Alex English"
<a class="moz-txt-link-rfc2396E" href="mailto:english@kingston.net"><english@kingston.net></a><br>
<b>Sent: </b>Monday, January 23, 2012 9:38:55 PM<br>
<b>Subject: </b>Re: [Stoves] The upside of Down feed<br>
<br>
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<div style="font-family: Arial; font-size: 12pt; color: #000000">Alex
and list:<br>
<br>
My interest is in the first several lines, which read:<br>
<br>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">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."</span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><br>
</span></p>
Alex: "Not so fast. I rather like the idea of a naturally
formed biochar venturi:)"<br>
<br>
<br>
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?<br>
<br>
Thanks. Ron<br>
<br>
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<br>
<hr id="zwchr"><b>From: </b>"Alex English"
<a class="moz-txt-link-rfc2396E" href="mailto:english@kingston.net"><english@kingston.net></a><br>
<b>To: </b>"Discussion of biomass cooking stoves"
<a class="moz-txt-link-rfc2396E" href="mailto:stoves@lists.bioenergylists.org"><stoves@lists.bioenergylists.org></a><br>
<b>Sent: </b>Monday, January 23, 2012 6:45:36 PM<br>
<b>Subject: </b>Re: [Stoves] The upside of Down feed<br>
<br>
Dear Crispin,<br>
<br>
On 22/01/2012 10:36 PM, Crispin Pemberton-Pigott wrote:
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<p class="MsoNormal"><span style="color:#1F497D">Dear Alex</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73,
125);">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.</span></p>
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Not so fast. I rather like the idea of a naturally formed
biochar venturi:)<br>
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<snip remainder></span><br>
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