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Crispin,<br>
<br>
1. Use the WORDS up draft and top lit to describe other things.
But the acronym of TLUD has a rather distinctive meaning to most
people who want some clarity when referring to stove types.
Attempts to usurp meaningful names or cause confusion about meanings
are not to be encouraged (to say that mildly).<br>
<br>
2. Referring to burning charcoal, tell me about lighting of cold
CHARCOAL on the top. The reality is that charcoal fires are lit at
the bottom (bottom burning) and the when the pyrolytic front reaches
the bottom of a batch TLUD operation, the fire (the glowing char) is
at the bottom. <br>
<br>
So where do you get this stuff about a descending "fire front" in
charcoal fires? Air coming in on the top does burn some char, but
that is hardly the way that a charcoal fire works.<br>
<br>
Paul<br>
<pre class="moz-signature" cols="72">Doc / Dr TLUD / Prof. Paul S. Anderson, PhD
Email: <a class="moz-txt-link-abbreviated" href="mailto:psanders@ilstu.edu">psanders@ilstu.edu</a>
Skype: paultlud Phone: +1-309-452-7072
Website: <a class="moz-txt-link-abbreviated" href="http://www.drtlud.com">www.drtlud.com</a></pre>
<div class="moz-cite-prefix">On 12/12/2017 8:26 PM, Crispin
Pemberton-Pigott wrote:<br>
</div>
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<p class="MsoPlainText">Dear Andrew<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">You are correct: the gasifier that burns
charcoal with a descending "fire front" (is that OK with you?)
is a TLUD gasifier, not a TLUD pyrolyser.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I object to the attempts to assign a
principle of operation, a lighting position, and a burn
direction, to
<i>one particular implementation</i> of it. Top lit refers to
something lit on top. Updraft refers to the direction of air
flow.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">It is inappropriate for promoters of
TLUD pyrolysers to claim that the term does not/cannot be
applied to other devices that are top lit updraft combustors.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">We need another term for the moving fire
front (if you will) that is descending through the fuel in a
downwards migrating direction.
<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">There is a rule on the internet that
once a conversation has descended to the point that one party
calls another a Nazi it is time to stop.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Crispin<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><span style="mso-fareast-language:EN-CA"
lang="EN-US">-----Original Message-----<br>
From: Stoves
[<a class="moz-txt-link-freetext" href="mailto:stoves-bounces@lists.bioenergylists.org">mailto:stoves-bounces@lists.bioenergylists.org</a>] On Behalf
Of Andrew Heggie<br>
Sent: 13-Dec-17 02:56<br>
To: Discussion of biomass cooking stoves
<a class="moz-txt-link-rfc2396E" href="mailto:stoves@lists.bioenergylists.org"><stoves@lists.bioenergylists.org></a><br>
Subject: Re: [Stoves] Understanding TLUDs, MPF and more.
(was Re: Bangladesh TLUD )</span></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">On Tue, 12 Dec 2017 02:29:42
+0000,Crispin Pemberton-Pigott <<a
href="mailto:crispinpigott@outlook.com"
moz-do-not-send="true"><span
style="color:windowtext;text-decoration:none">crispinpigott@outlook.com</span></a>>
wrote:<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">>Dear Gordon<o:p></o:p></p>
<p class="MsoPlainText">><o:p> </o:p></p>
<p class="MsoPlainText">>The MPF in an Adams Report is seen
when using small biomass, just as in a TLUD small-fuel
pyrolyser. It is also seen in gasifiers that does not make
char. The YDD charcoal gasifier (used to run engines) has an
MPF and it burns pure charcoal. As Andrew says, it is a
natural phenomenon, not something unique to TLUD's (or BLDD's)
nor to char-makers.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">That wilful misinterpretation of my post
is another example of your spin.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">We often see common words used in
combinations that come to have a meaning understood by all.
Americans have some simple examples, side and walk when
combined become understood by everyone to mean a footway at
the side of a highway. The german language accepts portmanteau
words, an obvious one that springs to mind is combining
National Sozialistische Deutsche Arbeiterpartei which we
english speakers know as the national socialist party and
wouldn't use that term to describe anything else. More
recently we have seen and old phenomenom mentioned by John
Evelyn in his 1662 book for making char in the open described
as flame curtain, we have come to accept this term for the
process because it is descriptive.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">As I said there are many processes where
a front moves steadily through a medium but the term migrating
pyrolysis front has come to be understood as describing the
TLUD process even if I prefer descending pyrolysis front.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Andrew<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
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</pre>
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