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<DIV>j</DIV>
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<DIV>In a message dated 1/28/2015 11:16:54 A.M. Pacific Standard Time,
stoves-request@lists.bioenergylists.org writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial>Send
Stoves mailing list submissions to<BR>
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Subject line so it is more specific<BR>than "Re: Contents of Stoves
digest..."<BR><BR><BR>Today's Topics:<BR><BR> 1. compiled a video
on the new "mobile adam-retort" for improved<BR> char
making (scda2@t-online.de)<BR> 2. Reports from ETHOS meetings: the
future of TLUD research<BR> (Julien
Winter)<BR><BR><BR>----------------------------------------------------------------------<BR><BR>Message:
1<BR>Date: Wed, 28 Jan 2015 00:23:28 +0100<BR>From: "scda2@t-online.de"
<scda2@t-online.de><BR>To: stoves@lists.bioenergylists.org<BR>Subject:
[Stoves] compiled a video on the new "mobile adam-retort" for<BR>
improved char making<BR>Message-ID:
<1YGFTk-0enYtk0@fwd25.aul.t-online.de><BR>Content-Type: text/plain;
charset="UTF-8"<BR><BR>https://www.youtube.com/watch?v=pXxhg78IH0A&feature=youtu.be<BR><BR>Dear
All<BR>finally i compiled a video on the new "mobile adam-retort" for a more
environmentally friendly charcoal making.<BR>The unit is based on 2 oil drums
and we have a volume for biomass to be carbonized of about 430
litres.<BR>Most of the smoke is burnt,<BR>Efficiency is high ~30%<BR>If
anybody wants to take up manufacturing these units -. welcome<BR><BR>Dr. Chris
ADAM<BR>scda2@ymail.com<BR><BR><BR><BR><BR><BR><BR>------------------------------<BR><BR>Message:
2<BR>Date: Wed, 28 Jan 2015 12:45:15 -0500<BR>From: Julien Winter
<winter.julien@gmail.com><BR>To: Discussion of biomass cooking
stoves<BR> <stoves@lists.bioenergylists.org><BR>Subject:
[Stoves] Reports from ETHOS meetings: the future of TLUD<BR>
research<BR>Message-ID:<BR>
<CALv4xTwNAT8X1DVGKcEoFks=fG+Qe-GCvXGjKM3HUWk6pPvWAA@mail.gmail.com><BR>Content-Type:
text/plain; charset="utf-8"<BR><BR>I was at ETHOS this year presenting some of
my basic investigations of TLUD<BR>function, and I will circulate a copy of my
presentation shortly. Kirk<BR>Harris presented his fascinating burner
design.<BR><BR>For me, one of the most interesting things at ETHOS was not
what was<BR>presented, but what is coming. The Colorado State University
has received<BR>a very large grant from the US Department of Energy to improve
our<BR>scientific understanding of natural draft TLUDs. This year at
ETHOS, they<BR>didn't present any results, but they described the laboratory
equipment<BR>that they have assembled. They will be able to measure the
flow rates of<BR>primary and secondary air, fuel bed and gas flame
temperatures, gas flame<BR>structure, the composition of the pyrogas as it
exists the fuel bed, and<BR>exhaust gas and particulate emissions. They
are able to test a variety of<BR>gas burners to increase clean-burning --- the
most pressing issue today.<BR>Knowledge gained on pyrolysis, combustion, and
gas flows will be<BR>systematized into computer simulation models.<BR><BR>This
work is much needed. Since the early 1980s, forced draft systems
have<BR>been extensively studied, however, except for a couple of recent
papers,<BR>natural draft systems, have not been studied at all. Research
on forced<BR>draft has provided us with some very important information, but
it doesn't<BR>extrapolate sufficiently well to natural draft systems.
Natural draft<BR>systems different from forced draft systems, in three
basic ways: (1) they<BR>operate at lower gas velocities, near atmospheric
pressure, (2) operational<BR>temperatures cover a lower range, and (3) and
their processes, are<BR>interconnected through feed-back mechanisms. We
have to understand how<BR>these feedbacks work for designing ND-TLUD
stoves. For example, how does<BR>the size and shape of the pyrogas flame
affect draft for primary air --><BR>gasification rate --> size and shape
of the pyrogas flame --> ...<BR><BR>It will be interesting to see what the
workers at Colorado State University<BR>come up with. I expect they will
be able to tell us what the control or<BR>limiting points are in the TLUD
reaction, such as resistance to gas flow in<BR>the fuel bed, or heat
production at the pyrolytic front. They should be<BR>able to tell us how
the thickness and temperature of the char layer above<BR>the pyrolytic front
changes the composition of pyrogas rising through it.<BR>They should be able
to tell us how the composition of pyrogas changes over<BR>a turndown
curve. Most importantly, I hope they will provide
guidelines<BR>for designing burners, reasons for why one thing works and not
another, and<BR>a computer program to simulate design decisions.<BR><BR>The
results from the Colorado State University lab can't come too
soon.<BR><BR>Cheers,<BR>Julien.<BR><BR>---------------------<BR><BR><BR>--
<BR>Julien Winter<BR>Cobourg, ON, CANADA<BR>-------------- next part
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