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<p><font size="+1">Dear Crispin,</font></p>
<p><font size="+1">The TGA contains small buckets of biomass, purged
with nitrogen and heated to a temperature at a specified
temperature and rate of increase. The weight loss is plotted.
How does it report "</font><span
style="mso-fareast-language:EN-US">is a large spike in heat
released at 360 C." ? <font size="+1">When I get a run-a-way
temperature i still get a very good char in the pipe, just not
at the temperature I want.</font> <br>
</span></p>
<p><span style="mso-fareast-language:EN-US">I care not to re-visit
spontaneous combustion but perhaps that the reaction you refer
to. That would include outside oxygen.<br>
</span></p>
<p><span style="mso-fareast-language:EN-US"><br>
</span></p>
<p><span style="mso-fareast-language:EN-US">Regards</span></p>
<p><span style="mso-fareast-language:EN-US">Frank<br>
</span></p>
<p><span style="mso-fareast-language:EN-US"><br>
</span></p>
<br>
<div class="moz-cite-prefix">On 12/14/17 11:18 AM, Crispin
Pemberton-Pigott wrote:<br>
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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Dear
Frank<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">The
charts provided to the thermogrametric analyser results show
that the partial decomposition of the biomass is exothermic,
and that there is a large spike in heat released at 360 C.
Some of the gas production (distillation) you are witnessing
is driven by that heat. If it cools rapidly, that heat is
lost and there is no more fuel to convert. Above that
temperature the gas production is driven by external heat.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">So
the answer is part and part, if the biomass is not well
insulated. Given enough insulation, the biomass not only
self-pyrolyses, it can experience thermal runaway as the
heat released is more than the heat needed to pyrolyse the
next fuel particle. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Regards<br>
Crispin<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span
lang="EN-US"> Stoves
[<a class="moz-txt-link-freetext" href="mailto:stoves-bounces@lists.bioenergylists.org">mailto:stoves-bounces@lists.bioenergylists.org</a>]
<b>On Behalf Of </b>Andrew Heggie<br>
<b>Sent:</b> 14-Dec-17 22:29<br>
<b>To:</b> Discussion of biomass cooking stoves
<a class="moz-txt-link-rfc2396E" href="mailto:stoves@lists.bioenergylists.org"><stoves@lists.bioenergylists.org></a><br>
<b>Subject:</b> Re: [Stoves] Understanding TLUDs, MPF and
more. (was Re: Bangladesh TLUD )<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">On 13 December 2017 at 05:43, Frank
Shields <<a href="mailto:franke@cruzio.com"
target="_blank" moz-do-not-send="true">franke@cruzio.com</a>>
wrote:<o:p></o:p></p>
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<div>
<p><span style="font-size:13.5pt">This is an
interesting topic and one i have wondered about.
When packing hard a pipe with biomass then
flushing with N2 then placing in an oven to heat
from the outside to a temperature to 550c a lot of
gases come out the small hole at the end. That
will ignite if the door is opened and O2 contact.
I have wondered if any heat is being produced in
the pipe itself? or all from external heat? If
there is it can't be much because the temperature
advances at a continuous rate. Should you see the
temperature jump well above 550c its because air
leaked in to the furnace and there is a flame.
</span><o:p></o:p></p>
</div>
</blockquote>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<p class="MsoNormal"><span style="font-size:13.5pt">Frank
it is interesting what you seem to be showing when
opening the door is that the pyrolysis offgas coming
out of the hole is above its auotignition point.
What would be relevant to the current discussion is
:</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:13.5pt">1
the temperature variation inside the tube
</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:13.5pt">2
the varying analysis of the composition of offgas as
the tube heats up.</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:13.5pt">Andrew</span><o:p></o:p></p>
</div>
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<pre class="moz-signature" cols="72">--
Frank Shields
444 Main Street Apt. 4205
Watsonville, CA 95076
(831) 246-0417 cell
<a class="moz-txt-link-abbreviated" href="mailto:franke@cruzio.com">franke@cruzio.com</a></pre>
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