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<div class="moz-cite-prefix">Crispin,<br>
<br>
Indeed this is quite useful info. I knew about DD combustors
and have also seen them in operation (at <i>Chip Energy</i> in
Illinois during "CHAB Camp" in 2010)... and have seen the way the
char could be "extracted" from the 'base' of their gasifier "at
just the right time" using a simple screw conveyor hooked up to
one side of the gasifier chamber, prior to where the ash was
pulled off ~ which also allowed the DD unit to operate at "full
load" (complete combustion to ash) or in a 'mode' that allowed for
char take-off (at the user's discretion -- by simply turning off
the char extraction conveyor).<br>
It was the type of system I would <i>probably</i> be looking
for, but on a somewhat smaller footprint -- since the <i>Chip
Energy</i> DD system was mounted inside a 20ft shipping
container. However my client has only a very limited amount of
space (~4ftX4ft), and I also wanted to get more info about <i>other</i>
devices that may be out there (available on the market) before
deciding on any particular technology. Do you know if
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<a href="http://www.allpowerlabs.org/"><span
style="font-family:Arial;font-size:9.15pt" lang="en-US">All
Power Labs</span></a>
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has anything smaller than the "power pallet"? (As far as I know
they also do not make their BEK anymore either.)<br>
<br>
Do you have more info about that "biomass burning DD stove <i>that</i>
was produced in Swaziland and test marketed around Johannesburg in
2004-2005" and/or the "Wood burning BLDD 6" from Johannesburg?<br>
A website? Spec sheets? A key contact in Swaziland/Johannesburg?
Pricing??<br>
<br>
My task right now is to bring forward and present three [3]
char-producing technologies to my client so that we can review
them and decide how to move forward based on the specifications,
price, features etc.<br>
While we are only at the "information gathering stage", it would
be good to have as mush concrete info as possible from as many
technology providers as possible so that we can make an educated
decision about how we will move forward (i.e. whether to purchase
'off-the-shelf' ~ if available ~ or to use some kind of
'open-source' plans to build a unit ourselves ... with the final
decision likely coming down to the all-in cost -- including
labour, shipping etc. etc.).<br>
<br>
P.S. I don't need any info about the lignite-burning BLDD 3
(developed in Mongolia) since I doubt that we will ever be
using/burning "50mm semi-coked briquettes".<br>
<br>
P.P.S. Does anyone know info about Greg Manning? I was once told
that he had built a Downdraft 'rig' in Brandon, Manitoba that
allowed for "unattended operation". Apparently he had developed an
800 lb "side bunker hopper" gasifier unit (with integrated Drying
Process) that ran about 7lb/hr (of chips) for ~ 4 3/4 days
(unattended).<br>
<br>
--<br>
P.P.P.S. Yes, it was a bit annoying to read so many (incomplete)
messages in a row from you. It seems that "BlackBerry 10
smartphone" that you are using could probably use a bit more
"software tweaking" for its 'virtual keyboard' so that users are
not continually annoying their own clients/friends/family with
unfinished (and repetitive) emails... [And I'm sure that you can
find a way to let BlackBerry know about this 'issue'. :-) ]<br>
<br>
Regards,<br>
<pre class="moz-signature" cols="72"> Lloyd Helferty, Engineering Technologist
Principal, Biochar Consulting (Canada)
<a class="moz-txt-link-abbreviated" href="http://www.biochar-consulting.ca">www.biochar-consulting.ca</a>
48 Suncrest Blvd, Thornhill, ON, Canada
905-707-8754
CELL: 647-886-8754
Skype: lloyd.helferty
Steering Committee coordinator
Canadian Biochar Initiative (CBI)
CURRENTS, A working group of Science for Peace
<a class="moz-txt-link-freetext" href="http://www.scienceforpeace.ca/currents/">http://www.scienceforpeace.ca/currents/</a>
President, Co-founder & CBI Liaison, Biochar-Ontario
National Office, Canadian Carbon Farming Initiative (CCFI)
Organizing team member, 2013 N/A Biochar Symposium:
<a class="moz-txt-link-abbreviated" href="http://www.carbon-negative.us/symposium">www.carbon-negative.us/symposium</a>
Member of the Don Watershed Regeneration Council (DWRC)
Manager, Biochar Offsets Group:
<a class="moz-txt-link-freetext" href="http://www.linkedin.com/groups?home=&gid=2446475">http://www.linkedin.com/groups?home=&gid=2446475</a>
Advisory Committee Member, IBI
<a class="moz-txt-link-freetext" href="http://www.linkedin.com/groups?gid=1404717">http://www.linkedin.com/groups?gid=1404717</a>
<a class="moz-txt-link-freetext" href="http://www.facebook.com/group.php?gid=42237506675">http://www.facebook.com/group.php?gid=42237506675</a>
<a class="moz-txt-link-freetext" href="http://groups.google.com/group/biochar-ontario">http://groups.google.com/group/biochar-ontario</a>
<a class="moz-txt-link-freetext" href="http://www.meetup.com/biocharontario/">http://www.meetup.com/biocharontario/</a>
<a class="moz-txt-link-freetext" href="http://www.biocharontario.ca">http://www.biocharontario.ca</a>
<a class="moz-txt-link-abbreviated" href="http://www.biochar.ca">www.biochar.ca</a>
"Producing twice as much food with diminishing resources, without further loss of natural habitats and biodiversity and in a changing climate may be the greatest challenge facing humanity."
- Lloyd Helferty</pre>
On 2014-05-21 7:23 AM, Crispin Pemberton-Pigott wrote:<br>
</div>
<blockquote
cite="mid:COL401-EAS262BD8C52AFDDD924F91078B13C0@phx.gbl"
type="cite">
<div style="width: 100%; font-size: initial; font-family: Calibri,
'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align:
initial; background-color: rgb(255, 255, 255);"><span
style="font-size: initial; line-height: initial; text-align:
initial; font-family: Calibri, 'Slate Pro', sans-serif;"></span>Sorry
for the tedious repetitions, I keep sending the message
accidently - virtual keyboard... :( </div>
<div style="width: 100%; font-size: initial; font-family: Calibri,
'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align:
initial; background-color: rgb(255, 255, 255);"><br
style="display:initial">
</div>
<div style="font-size: initial; font-family: Calibri, 'Slate Pro',
sans-serif; color: rgb(31, 73, 125); text-align: initial;
background-color: rgb(255, 255, 255);"><br>
</div>
Dear Jason and Lloyd
<div><br>
</div>
<div>The downdraft combustor can be very clean burning, it is
agreed. A biomass burning DD stove was produced in Swaziland and
test marketed around Johannesburg in 2004-2005. It also had a
retrofit combustor that had an additional feature which was that
the gas outlet was angled. This allowed the insert to be rotated
with respect to the stove body sending the hottest gases
directly against the side wall for space heating or against the
side of a sunken pot for high efficiency cooking. </div>
<div><br>
</div>
<div>I think it was the first DD stove that made a serious efforts
to implement the 'floating fuel' approach to the grate, the
grate was made from thin high temperature wire. </div>
<div><br>
</div>
<div>The insert was conical at the bottom with preheated secondary
air. It is also possible to cook on the upper side of such a
layout, something incorporated into the BLDD stoves at the SeTAR
Centre In Johannesburg now at version 6. The Wood burning BLDD 6
can cook three pots at once. </div>
<div><br>
</div>
<div>The BLDD 3 developed in Mongolia was tuned to burn lignite
and was the only stove available there in 2009 that could
properly burn 50mm semi-coked briquettes. The DD approach still
has much unexplored merit. </div>
<div><br name="BB10" caretmarkerset="INVALID"
class="markedForCaretMarkerRemoval">
</div>
<div>To make char with a DD stove requires removing it at just the
right time. It is easier to do that with a cross draft burner
which is just as clean and easier to light. </div>
<div><br name="BB10" caretmarkerset="INVALID"
class="markedForCaretMarkerRemoval">
</div>
<div>Regards </div>
<div>Crispin </div>
<div><br>
</div>
<div><br>
<div style="background-color: rgb(255, 255, 255);">
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
<div>Jason,<br>
<br>
I've taken a look at your website and the info about the
"IntensiFire", however one of the main points of the project
will be to produce biochar (for use with the compost that
they are already making). If the IntensiFire is only meant
to increase efficiency and to reduce emissions for wooid
burning stoves, this may not be quite what we are looking
for, although it might be possible to "adapt" the
IntensiFire to the application in some way [?] (in order to
maximize the efficiency and minimize the emissions) ~
although the total cost might be quite prohibitive, given
that the IntensiFire (Mk II) is already starting at $499 NZD
(not including shipping all the way from NZ to Canada).<br>
I will, however, keep your downdraft technology in mind as
we move forward with our project.<br>
<br>
Regards,<br>
<pre cols="72"> Lloyd </pre>
</div>
</div>
</div>
<br>
<br>
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