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Crispin,<br>
<br>
There are numerous examples of 210 liter barrel TLUD char-makers.
One document by me (ETHOS a few years ago) showed several.<br>
<br>
AIR CONTROL is the key. There must be sufficient <u>potential </u>for
primary air flow, meaning to have sufficient holes or slots, etc to
let in the primary air. But then have a way of controlling the
amount of air that can get into the space under those holes!!! It
is not reliable to expect the fuel to do the control of the air flow
(except perhaps for the case of industrially processed pellets that
have great consistency).<br>
<br>
My general recommendation is for people to make a TLUD that is known
to work well (and know its fuel also). Gain experience. And only
then make changes and new designs, with the intention of getting
better results. I have observed that some people who launch into a
new design (and/or new fuel) without much prior experience can be
disappointed with their results and blame the technology because
they lack any prior positive experiences for comparison.<br>
<br>
I do not discourage people from trying new variations and fuels, but
I encourage them to understand what has been shown to work rather
well. THEN go for the improvements and new fuels, etc.<br>
<br>
Paul<br>
<pre class="moz-signature" cols="72">Doc / Dr TLUD / Prof. Paul S. Anderson, PhD
Email: <a class="moz-txt-link-abbreviated" href="mailto:psanders@ilstu.edu">psanders@ilstu.edu</a>
Skype: paultlud Phone: +1-309-452-7072
Website: <a class="moz-txt-link-abbreviated" href="http://www.drtlud.com">www.drtlud.com</a></pre>
<div class="moz-cite-prefix">On 6/22/2015 5:52 PM, Crispin
Pemberton-Pigott wrote:<br>
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Dear Paul</div>
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<br>
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I am willing to give the 210 litre drum a go with non-woody
biomass. </div>
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Offhand, if I scale it from something smaller, is there
anything you think changes the functions fundamentally?</div>
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<br>
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I am presuming the same general rules apply: wetter fuel means
less charcoal, lower temperature means more char, and particle
size dominates the air flow. </div>
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<br>
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From the message below it seems the fuel is being used as the
air flow controller more than the hardware. That could be risky
if the fuel is not homogeneous. Maybe it is best to plan for
complete control of the air. </div>
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<br>
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Thoughts welcome</div>
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Crispin </div>
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<div class="PlainText">Josh and Biochar folks (and to Stovers
because it relates to the TLUD
<br>
cookstove),<br>
<br>
Josh had a truly excellent and important presentation today as
an IBI <br>
Webinar about water treatment with charcoal / biochar. And
TLUD <br>
technology for char making was well recognizied in the
presentation.<br>
<br>
He was asked about control of primary air in barrel-size TLUD
ovens. <br>
He uses barrels with lots of holes in the grate (even using
expanded <br>
steel. His control method was mainly via the careful
attention to the <br>
sized of the biomass feedstock.<br>
<br>
There are other methods that should help simplify the char
making. <br>
Simplest one is to have the barrel over a shallow pit, with
one (or a <br>
few) entries as fist-size "notches" in the dirt for entry of
the primary <br>
air. Then, when the reaction is getting to be too much, put
some dirt <br>
over most of the notches (be sure to leave some air entry,
learn by <br>
experimenting.)<br>
<br>
How to know when the reaction (pyrolysis plus the flaring of
the gases) <br>
is too much? Create a visual "gauge" in the side of the
chimney (or <br>
upper barrel, in Josh's configuration). I like to use 1/8th
inch (3mm) <br>
holes drilled into the side in a straight vertical line, with
spacing of <br>
4 inches (10 cm) between the holes. Do this all the way to
the top of <br>
the chimney. So 10 holes would be 40 inches or 100 cm. You
can see <br>
the flames flickering inside the chimney. It could be a 4
hole (16 <br>
inch or 40 cm) tall flame. This is nice for being able to see
the height <br>
of the flame even if you are away from the unit but can see
the holes.<br>
*********<br>
Josh was also asked about use of the heat, but his interest is
in the <br>
char. EITHER the value of the heat or the value of the char
might <br>
justify the use of the TLUD. But when you have use for BOTH,
each one <br>
supports the other. Char of water filtration and heat for <br>
institutional cooking or a bakery, etc can match with the
barrel-size <br>
TLUDs. Or use many household cookstoves to gather the
quantity of char <br>
for a village-size water purification installation that Josh
has. <br>
Either way can get the benefits of using the heat and getting
the char.<br>
**********<br>
About the last question to him: Scaling up the TLUD
technology larger <br>
than 55 gallon (200 liter) barrels has not been very
successful. If <br>
you try it, please report your results (favorable or not).<br>
<br>
Paul<br>
<br>
-- <br>
Doc / Dr TLUD / Prof. Paul S. Anderson, PhD<br>
Email: <a class="moz-txt-link-abbreviated" href="mailto:psanders@ilstu.edu">psanders@ilstu.edu</a><br>
Skype: paultlud Phone: +1-309-452-7072<br>
Website: <a moz-do-not-send="true"
href="http://www.drtlud.com">www.drtlud.com</a><br>
<br>
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