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<DIV><FONT size=2 face=Arial>Dean,</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Thank you for bringing this up. I have never
really thought about there being a difference between pyrolysis and
gasification. The definition of gasification in Wikipedia, "<FONT size=3
face="Times New Roman">This is achieved by reacting the material at high
temperatures (>700 °C), without combustion, with a controlled amount
of </FONT><FONT size=3 face="Times New Roman">oxygen</FONT><FONT size=3
face="Times New Roman"> and/or </FONT><FONT size=3
face="Times New Roman">steam",</FONT> is different from the definition
of pyrolysis which is without additional oxygen. Your statement seems
correct according to this. </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>As I read further in Wikipedia, there is a section
on chemical reactions. Here there are 5 different processes which the fuel
undergoes, pyrolysis being one of those. This would lead me to believe
that pyrolysis is part of the more general process of gasification.
Rather than it being one or the other, a TLUD would include
both. The small amount of added air supports the combustion of a
small amount of the gas to produce heat, but that air is soon used up and most
of the fuel pyrolyzes without added air. The combination, including
pyrolysis, would be gasification.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>I will look further to see if Christa
Roth adresses this question in her Micro-gasification manual.
</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Kirk</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=deankstill@gmail.com href="mailto:deankstill@gmail.com">Dean
Still</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=stoves@lists.bioenergylists.org
href="mailto:stoves@lists.bioenergylists.org">Discussion of biomass cooking
stoves</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, May 16, 2015 3:50
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [Stoves] Pyrolysis: No
Air?</DIV>
<DIV><BR></DIV>
<DIV dir=ltr>
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<LI
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<DIV style="PADDING-BOTTOM: 20px; OVERFLOW: hidden">Hi All,</DIV></LI></OL>
<DIV><SPAN style="LINE-HEIGHT: 16px">When I look up the word pyrolysis I find
the following:</SPAN></DIV>
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<LI
style="BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px; LINE-HEIGHT: 1.24; LIST-STYLE-TYPE: none; MARGIN: 0px; PADDING-LEFT: 20px; PADDING-RIGHT: 20px; CLEAR: none; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 20px">
<DIV style="PADDING-BOTTOM: 20px; OVERFLOW: hidden"><B
style="LINE-HEIGHT: 1.24; FONT-SIZE: 16px">Pyrolysis</B><SPAN
style="LINE-HEIGHT: 1.24; FONT-SIZE: 16px"> </SPAN><SPAN
style="LINE-HEIGHT: 1.24; FONT-SIZE: 16px">is a thermochemical decomposition
of organic material at elevated temperatures in the absence of oxygen (or
any halogen). It involves the simultaneous change of chemical composition
and physical phase, and is irreversible. The word is coined from the
Greek-derived elements pyro "fire" and lysis "separating".</SPAN></DIV>
<LI
style="BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px; LINE-HEIGHT: 1.24; LIST-STYLE-TYPE: none; MARGIN: 0px; PADDING-LEFT: 20px; PADDING-RIGHT: 20px; CLEAR: none; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 20px">
<DIV style="PADDING-BOTTOM: 20px; OVERFLOW: hidden"><SPAN
style="LINE-HEIGHT: 1.24; FONT-SIZE: 16px">However, I think that folks use
it to describe what happens in a TLUD, etc? Isn't that gasification not
pyrolysis because of the presence of some air?</SPAN></DIV></LI></OL>
<DIV><SPAN style="LINE-HEIGHT: 19px; FONT-SIZE: 16px">Best,</SPAN></DIV>
<DIV><SPAN style="LINE-HEIGHT: 19px; FONT-SIZE: 16px"><BR></SPAN></DIV>
<DIV><SPAN style="LINE-HEIGHT: 19px; FONT-SIZE: 16px">Dean</SPAN></DIV></DIV>
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