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Char-makers,<br>
<br>
This good discussion on the Stoves Listserv is being shared with the
Biochar Listserv. Let discussions proceed on each and both and see
what happens.<br>
<br>
It is great to see so much discussion. And Bill's video of his 350
gallon unit is very informative. We await info and photos of the
500 gallon unit he is making now. <br>
<br>
Bill wrote:<br>
<blockquote type="cite">the larger the diameter of the <span>TLUD</span>,
the greater the chance that the pyrolysis front will not reach the
hearth in all areas at the same time. If this happens you risk
overheating tha hearth if you wait for all the fuel to pyrolyse
and burn some of the biochar. </blockquote>
I completely agree. And when we report on our actual experience,
please specify the diameter (which is probably more important that
the volume).<br>
<br>
Diameters: <br>
1. A 200 Liter (55 gal) drum or barrel is about 23 inches (58 cm)
in diameter. And that works rather well in the Jolly Roger Ovens
(J-ROs) and similar units.<br>
<br>
2. From Bill's video, his unit 350 gallon (over 1000 liter) unit
is quite tall and has a diameter about the same as at 55 gal drum.
It is good to see that it works well.<br>
<br>
3. If I remember correctly, Alex's largest unit was 42 inch
diameter (107 cm) and had problems with uneven descent of the
Migratory Pyrolytic Front (MPF). That matches well with Bill
comment that is quoted above. <br>
<br>
So, is Bill's 500 gal unit even taller but still "slender"? And
how well does it work?<br>
<br>
An interesting question is about the possible favorable impact of
having some of the following changes in the big TLUDs:<br>
<br>
A. Impact of a tapering the inside diameter in the lower section.
But as I think more about that, I have my doubts if it will resolve
the irregular MPF issue.<br>
<br>
B. impact of having sensors around the circumference of the TLUD at
perhaps 1 meter vertical distances. And if the temperature
(indicating the MPF) is greater on one side too soon, EITHER <br>
inject addition primary air via tuyers (nozzels) on the colder sides
to hasten the MPF in those areas, OR<br>
inject a bit of water into the area of the hot side to slow its
movement a bit. <br>
<br>
With serious char-making devices such as what Bill has, a relatively
small cost would be the welding of some pipe nipples (each with a
screw on cap) at the appropriate places for the air or water entries
(B above) and where thermocouples could be inserted to check
temperatures including in the center of the cylindrical column of
fuel.<br>
<br>
If anyone tries these ideas, please let us all know you progress and
results.<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 5/14/2015 8:20 PM, biocharFIRST .
wrote:<br>
</div>
<blockquote
cite="mid:CAL+JJxOzHWiXU2U6bXQCgVw-6PUhS7Pw=_-JzdRZPr59c7ZLvA@mail.gmail.com"
type="cite">
<div dir="ltr">I don't know how big you can build a <span>TLUD</span>.
However about three years ago I built a 350 gallon <span>TLUD</span>
that is working out very well, except for the fact that we do
not have a use for the sen gas where the <span>TLUD</span> is
now located at my home. You can see a video at, <span>vhttps</span>://www.<span>youtube</span>.com/watch?v=5Kfr4NRhJ0s.
<div><br>
</div>
<div>Currently we have almost completed a 500 gallon <span>TLUD</span>
that is designed to exhaust all of the sen gas down a tube in
the center of the tank so the heat from the gas can easily be
captured for various uses. </div>
<div>r be uniformly dry, and the larger the diameter of the <span>TLUD</span>,
the greater the chance that the pyrolysis front will not reach
the hearth in all areas at the same time. If this happens you
risk overheating tha hearth if you wait for all the fuel to
pyrolyse and burn some of the biochar. If you shut off the
primary before pyrolysis is complete you will get some smoke
and some biomass that is not completely pyrolysed. </div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Thu, May 14, 2015 at 4:46 PM,
Crispin Pemberton-Pigott <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:crispinpigott@outlook.com" target="_blank">crispinpigott@outlook.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">AJH
>Yes and/or premixing but why does burning rice hulls
tend more to the<br>
blue flame?<br>
<br>
Lower volatiles? The carbon/hydrogen ratio is not the same
as wood. Maybe<br>
that helps.<br>
<br>
Apparently the reactions can be shifted from CO to H2 by
using different<br>
catalysts:<br>
Crispin<br>
<br>
From <a moz-do-not-send="true"
href="http://www.sciencedirect.com/science/article/pii/0141460786900727"
target="_blank">http://www.sciencedirect.com/science/article/pii/0141460786900727</a><br>
<br>
Catalytic gasification of rice hull and other biomass. The
general effect of<br>
catalyst.<br>
<br>
Abstract:<br>
Thermochemical decomposition and catalytic conversion of
rice hull and some<br>
other cellulosic materials in a fluidized bed reactor
containing different<br>
catalysts as the bed material were studied. The use of
catalyst invariably<br>
gave gas yields above that of the non-catalyzed gasification
process and<br>
also changed the product distribution according to the
nature of the<br>
catalyst. Generally, an acidic catalyst favored the
formation of carbon<br>
monoxide and olefins while a supported-metal catalyst
increased the amounts<br>
of hydrogen and carbon dioxide. Nickel catalyst yielded as
much as 60%<br>
hydrogen at a reaction temperature of 650°C. The gas yield
and product<br>
distribution are mainly decided by the properties of the
catalyst and less<br>
by the properties of the biomass.<br>
<div class="HOEnZb">
<div class="h5"><br>
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-- <br>
<div class="gmail_signature">
<div dir="ltr"><a moz-do-not-send="true"
href="http://www.ithakajournal.com" target="_blank">http://www.ithakajournal.com</a></div>
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