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<p style="line-height: normal;" class="MsoNormal"
style="margin:0px;"><span lang="EN-US" style="font-size:
10pt;">Literature:<br /></span></p><p style="line-height: normal;"
class="MsoNormal" style="margin:0px;"><span lang="EN-US"
style="font-size: 10pt;">When the wood is dry and heated to around
280°C, it begins to
spontaneously break down to produce charcoal plus water vapor, methanol,
acetic
acid and more complex chemicals, chiefly in the form of tars and
non-condensable gas consisting mainly of hydrogen, carbon monoxide and
carbon
dioxide. Air is admitted to the carbonizing kiln or pit to allow some
wood to
be burned and the nitrogen from this air will also be present in the
gas. The
oxygen of the air is used up in burning part of the wood
charged.<span> </span>The spontaneous breakdown or carbonization of
the wood above a temperature of 280°C liberates energy and hence this
reaction
is said to be <b>exothermic</b>. This process of spontaneous breakdown
or
carbonization continues until only the carbonized residue called
charcoal
remains. Unless further external heat is provided, the process stops and
the
temperature reaches a maximum of about 400°C. <br /></span></p><p
style="line-height: normal;" class="MsoNormal" style="margin:0px;"><br
/><span lang="EN-US" style="font-size: 10pt;"></span></p><p
style="line-height: normal;" class="MsoNormal" style="margin:0px;"><span
lang="EN-US" style="font-size: 10pt;">ADAM:<br /></span></p>
<p style="line-height: normal;" class="MsoNormal"
style="margin:0px;"><span lang="EN-US" style="font-size: 10pt; color:
red;">Comment: “exothermic” is still <b>a kind of mystery
for me, </b>because I often realized that If the wood chamber of a
retort already heats up
to ~300°C – still a lot of heat Is needed from <b>outside</b> to push
gasification. </span></p>
<p style="line-height: normal;" class="MsoNormal"
style="margin:0px;"><span lang="EN-US" style="font-size: 10pt; color:
red;">I am really tempted to make a laboratory experiment.
Place a piece of oven dry wood in a small container, and place it in in
electric oven by 500°C., record the temperature inside the small
container
wood, ideally the temperature should jump up more quickly above 280°C,
because
of additional “exothermic” heat supplied from “inside the wood-charcoal
piece?<br />
<b>But I don’t recall to have seen such a jump in a plotted
graph?<span> </span>Also anyone has an idea about that”amount” of
that expected “exothermic” heat??<span> </span></b><br
/></span></p><p style="line-height: normal;" class="MsoNormal"
style="margin:0px;"><span lang="EN-US" style="font-size: 10pt; color:
red;">THANKS Chris</span></p>
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