<div dir="ltr">Kirk,<div><br></div><div>That's very interesting! Thanks! </div><div><br></div><div>You say:</div><div><br></div><div><span style="font-family:Arial">"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."</span></div><div><span style="font-family:Arial"><br></span></div><div><font face="Arial">I experience that a constant supply of air is needed to keep the TLUD going. Without added air I see the gas making eventually stop so I've wondered if the word gasification is a better descriptor. I agree that it is a small amount of primary air which, if too much, makes too much gas and then produces visible smoke since the mixing/time can't handle the overly rich mixture. </font></div><div><font face="Arial"><br></font></div><div><font face="Arial">Too little primary air and the reactions stop? You experience that no primary air is needed to continue the reactions?</font></div><div><font face="Arial"><br></font></div><div><font face="Arial">What about a Rocket or an open fire? No pyrolysis? Always has oxygen?</font></div><div><font face="Arial"><br></font></div><div><font face="Arial">Best,</font></div><div><font face="Arial"><br></font></div><div><font face="Arial">Dean<br></font><div class="gmail_extra"><br><div class="gmail_quote">On Sat, May 16, 2015 at 8:34 PM, kgharris <span dir="ltr"><<a href="mailto:kgharris@sonic.net" target="_blank">kgharris@sonic.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><u></u>
<div bgcolor="#ffffff">
<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>
<blockquote style="border-left-color:rgb(0,0,0);border-left-width:2px;border-left-style:solid;padding-left:5px;padding-right:0px;margin-left:5px;margin-right:0px" dir="ltr">
<div style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:10pt;line-height:normal;font-family:arial">----- Original Message ----- </div>
<div style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:10pt;line-height:normal;font-family:arial;background:rgb(228,228,228)"><b>From:</b>
<a title="deankstill@gmail.com" href="mailto:deankstill@gmail.com" target="_blank">Dean
Still</a> </div>
<div style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:10pt;line-height:normal;font-family:arial"><b>To:</b> <a title="stoves@lists.bioenergylists.org" href="mailto:stoves@lists.bioenergylists.org" target="_blank">Discussion of biomass cooking
stoves</a> </div>
<div style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:10pt;line-height:normal;font-family:arial"><b>Sent:</b> Saturday, May 16, 2015 3:50
PM</div>
<div style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:10pt;line-height:normal;font-family:arial"><b>Subject:</b> [Stoves] Pyrolysis: No
Air?</div>
<div><br></div>
<div dir="ltr">
<ol style="border:0px;padding:0px;line-height:15px;margin:0px;font-size:13px">
<li style="border:0px;padding:20px 20px 0px;line-height:1.24;list-style-type:none;margin:0px;clear:none">
<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>
<ol style="border:0px;padding:0px;line-height:15px;margin:0px;font-size:13px">
<li style="border:0px;padding:20px 20px 0px;line-height:1.24;list-style-type:none;margin:0px;clear:none">
<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><li style="border:0px;padding:20px 20px 0px;line-height:1.24;list-style-type:none;margin:0px;clear:none">
<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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