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Marc, A reply to an older message. see below<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 2/3/2015 1:47 AM, Marquitusus wrote:<br>
</div>
<blockquote cite="mid:DUB127-W15DFEAE794E85A9ED5BB0AA83D0@phx.gbl"
type="cite">
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<div dir="ltr">Hi Julien and all,
<div><br>
</div>
<div><i>You have mentioned the problem with temperature control,
and the solution: turning down the primary air.</i><br>
Yes. It is possible in theory, but in the practice it is not
easy to built a TLUD stove with primary air control. Almost
for me! It is what I'm trying to do now: testing any sliding
little doors or other methods. It is my poor tinsmith skills I
guess!</div>
</div>
</blockquote>
For primary air control, try a tube or thin pipe into the area under
the grate. Near the outer end of the pipe, cut down half-way a
slit (use a hack saw). Into the slit you can slide a thin piece of
metal that is a barrier that closes inside the pipe and has an upper
piece that you can hold. Make several of the barriers, and into
them put different numbers of small holes (2 mm maybe) so that there
are different amounts of air that can pass the barrier (plus what
air leaks past.).<br>
<blockquote cite="mid:DUB127-W15DFEAE794E85A9ED5BB0AA83D0@phx.gbl"
type="cite">
<div dir="ltr">
<div><br>
</div>
<div><i style="font-size: 12pt;">Would you say that the solution
to this is to build a TLUD-oven unit that is designed to use
only pellets as fuel, and use a TLUD of sufficient depth to
pyrolyze for two hours? </i><span style="font-size: 12pt;">Yes,
this is what I think would be the best. Changing the reactor
in the middle of a baking process can be challenging for a
baker when you have a lot of loaves of bread you have to
manage! Pellets or any other well working fuel.</span></div>
</div>
</blockquote>
If the baker has a second TLUD unit, ignite it and insert it
promptly when the initial unit has finished the pyrolysis. Repeat
as many times as needed. This should not impact the bread at all.<br>
<br>
Paul<br>
<br>
<blockquote cite="mid:DUB127-W15DFEAE794E85A9ED5BB0AA83D0@phx.gbl"
type="cite">
<div dir="ltr">
<div><br>
</div>
<div><i>I find that 30 cm of softwood pellets lasts about that
long, and there is a slight reduction in power output over
time. </i>I also think 30cm of pellets would last this long,
but since now I have found challenging building a TLUD stove
with a reactor of more than 20cm in length, because lack of
primary air draft. This normally leads to little power and the
extinguish of the flame due to too much distance between the
combustion zone and the pyrolisis front. As Crispin has
suggested a lot of times, some early secondary air near the
fuel bed should do the trick. I wonder when I will have time
to try this...</div>
<div><br>
</div>
<div>About measuring temperature in an oven with a thermocouple,
I answer in the next mail<br>
<br>
Thanks!<br>
Marc<br>
<br>
<div>
<hr id="stopSpelling">Date: Mon, 2 Feb 2015 17:20:37 -0500<br>
From: <a class="moz-txt-link-abbreviated" href="mailto:winter.julien@gmail.com">winter.julien@gmail.com</a><br>
To: <a class="moz-txt-link-abbreviated" href="mailto:stoves@lists.bioenergylists.org">stoves@lists.bioenergylists.org</a><br>
Subject: [Stoves] TLUD Oven paper updated<br>
<br>
<div dir="ltr">
<div>Hi Marc;</div>
<div><br>
</div>
<div>Thanks for your paper on baking with a TLUD. There
is a lot we can learn from your experience.</div>
<div><br>
</div>
<div>You have mentioned the problem with temperature
control, and the solution: turning down the primary air.</div>
<div><br>
</div>
<div>You have also mentioned a problem with duration of
temperature, with about 2 hours being best. Would you
say that the solution to this is to build a TLUD-oven
unit that is designed to use only pellets as fuel, and
use a TLUD of sufficient depth to pyrolyze for two
hours? I find that 30 cm of softwood pellets lasts
about that long, and there is a slight reduction in
power output over time. Otherwise, if using nut shells,
would it be possible to have a second TLUD to exchange
with the first when pyrolysis is complete?</div>
<div><br>
</div>
<div>You may be aware that measuring air temperature with
a thermocouple is prone to some inaccuracy due to
radiant energy exchange between the thermocouple and the
environment. In your case, since the walls of the oven
heat up, the error may not be of practical consequence
... but it is something you may want to check into.</div>
<div><br>
</div>
<div>A radiation shield can be used to improve the
accuracy of thermocouple measurements in air. I need to
solve this problem myself. At the moment, I am
considering inserting a K-type thermocouple probe into a
thin-walled stainless steel tube with openings at both
ends, such as described here:</div>
<div><a moz-do-not-send="true"
href="http://www.msm.cam.ac.uk/utc/thermocouple/pages/ThermocouplesInGasTurbines.html"
target="_blank">http://www.msm.cam.ac.uk/utc/thermocouple/pages/ThermocouplesInGasTurbines.html</a></div>
<div><br>
</div>
<div>Perhaps someone else has some suggestions?</div>
<div><br>
</div>
<div>Thanks again for the informative paper.</div>
<div><br>
</div>
<div>Cheers,</div>
<div>Julien.</div>
<div><br>
</div>
<div>(ps: Gmail's spelling checker has a sense of humor.
It wants to change "pyrolyze" into "paralyze". Good
thing I did a little proof-reading.)<br clear="all">
<br>
-- <br>
</div>
<div class="ecxgmail_signature">
<div dir="ltr">Julien Winter<br>
Cobourg, ON, CANADA<br>
</div>
</div>
</div>
<br>
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