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<p><font size="+1">Andrew,</font></p>
<p><font size="+1">A pipe filled with sand, purged with N2 and
temperature probe placed inside and placed in a furnace,- the
temperature should lag behind the oven temperature as the heat
slowly goes into the pipe. The temperature of biomass inside the
pipe should also lag behind unless heat is produced inside from
the biomass. I will not be permitted to drill two holes through
the furnace wall to test this out. But I think the experiment
would show if Oxygen in the biomass structure already reacted
with surrounded C and H would free up and increase heat as a
secondary 'structure shift'(?) occurs. <br>
</font></p>
<p><font size="+1"><br>
</font></p>
<p><font size="+1">When charring biomass at increasing temperatures
(450c to 900c in 50deg increments) it needs to be done very
slowly or fire happens and a run-a-way temperature ruining the
experiment. The char produced is used to plot Activity to find
the optimum temperature for highest activity char. This heated
slowly to allow the gases to escape and dilute below
concentrations supporting combustion. <br>
</font></p>
<p><font size="+1">I don't have equipment for gas analysis. The lab
I now work in is very small using cheap equipment. It can do all
I would want for biomass testing (Box-1) and a lab like it could
be set up anywhere. <br>
</font></p>
<p><font size="+1">Regards</font></p>
<p><font size="+1"><br>
</font></p>
<p><font size="+1">Frank<br>
</font></p>
<p><font size="+1"></font><br>
</p>
<br>
<div class="moz-cite-prefix">On 12/14/17 8:28 AM, Andrew Heggie
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAPSaZeaOQx_O5-r8BoZQu=utkH1K+4-q+jDxv8qNopbcwLhCrw@mail.gmail.com">
<div dir="ltr"><br>
<div class="gmail_extra"><br>
<div class="gmail_quote">On 13 December 2017 at 05:43, Frank
Shields <span dir="ltr"><<a
href="mailto:franke@cruzio.com" target="_blank"
moz-do-not-send="true">franke@cruzio.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
<p><font size="+1">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. <br>
</font></p>
</div>
</blockquote>
<div><br>
</div>
<div><font size="+1">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 :</font></div>
<div><font size="+1">1 the temperature variation inside the
tube <br>
</font></div>
<div><font size="+1"><br>
</font></div>
<div><font size="+1">2 the varying analysis of the
composition of offgas as the tube heats up.</font></div>
<div><font size="+1"><br>
</font></div>
<div><font size="+1">Andrew</font><br>
</div>
</div>
</div>
</div>
<br>
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<br>
<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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