<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Arial; font-size: 12pt; color: #000000'>Alex and list:<br><br> Interesting that this mound forms. It seems there must be substantial velocity to the air. Can you guess as to the length of the mound - both actual and in diameters..<br><br> You say "<span style="font-style: italic;">This happens past the
end of the grate."</span> I have had a mental image of a rather complete blockage of the pipe with new pellets only able to fall down and begin pyrolysis as lower level char was burned up. Is that part still a correct image? Now I am envisioning enough high velocity air flow that there is also this separate "<em>long Kilimanjaro"</em> which is not physically connected to the "pile" directly under the hopper. Maybe this forms to a certain length and then can grow no more? Anything you can do to give a better mental image of why this shape would be appreciated. This mound is fully charred?.<br><br> I of course like the idea of the pot - and hope that char production can be part of the operation.<br><br> I am missing (after a few minutes of googling) the connection between coal (charcoal?) and Kilimanjaro<br><br> I also sent a different note with more questions about 8 hours before this response. Still hoping you can answer those questions also. <br><br> Thanks Ron<br><br><hr id="zwchr"><b>From: </b>"Alex English" <english@kingston.net><br><b>To: </b>"Discussion of biomass cooking stoves" <stoves@lists.bioenergylists.org><br><b>Sent: </b>Tuesday, January 24, 2012 7:14:10 PM<br><b>Subject: </b>Re: [Stoves] The upside of Down feed<br><br>
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Ron,<br>
As you know small dimensioned biomass generally chars as a first
stage of combustion. If the char moves into an air starved zone in
the furnace it will cool a bit and collect. This happens past the
end of the grate. It forms a long Kilimanjaro shaped mound in the
pipe. The peak is about half the pipe diameter. Perhaps its a
stretch, but it could be described as half of a convergent/divergent
nozzle. The acceleration over the peak seems to prevent further pile
growth, a form of mountain top removal, char-coal mining. I'm not
the first to link coal to Kilimanjaro.<br>
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I have not tried to turn it into a char maker. It is possible that a
pot could be placed under that portion of the pipe, et viola. For
now it remains a known unknown.<br>
Alex<br>
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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>
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Thanks. Ron<br>
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