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<div class="moz-cite-prefix">Dear Crispin and all,<br>
<br>
First, the quote:<br>
<br>
<blockquote type="cite"><span
style="font-size:10.0pt;font-family:"ArialMT","serif";mso-fareast-language:EN-US">Designed
by Paul Anderson, the top light upward draught (tlud)
gasifying cook stove works o</span></blockquote>
<br>
This statement can be correct if referring to a specific TLUD
stove that I designed, which I think is the case of the author who
is quoted. However, it should NOT be taken that I originated
the TLUD stoves. The originators are Thomas Reed and Paal
Wendelbo, working independently in the 1980s and 1990s. Note
that we do not credit the Norwegian resistance fighters who
influenced Wendelbo as originators of TLUD stoves. Those men
were doing top-lighting of open fires, that is, fires that were
NOT contained inside the walls of stoves. We needed Wendelbo to
accomplish that!!!<br>
<br>
Second, Crispin wrote:<br>
<blockquote type="cite"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The
TLUD was invented centuries ago as a way to burning with
little smoke. The Romans used TLUD fires. </span></blockquote>
<br>
Until Crispin or others can produce hard evidence to support such
a statement, please consider the above to be utterly false and
should NOT be quoted.<br>
<br>
Crispin, let's have the documentation or a retraction or at least
stop writing such nonsense. Maybe the Romans did. Maybe cavemen
did. But no proof, no credit. Forty years ago I observed a
"TLUD-like" fire in the top of a burn barrel on an windless day.
But I did not understand it, and I did not develop the
concept/technique, and I do not take any credit for the original
work about TLUDs. If some Roman or caveman ignited some pile of
brush or wood on the top, that does not constitute inventing TLUD
gasifier cookstoves.<br>
<br>
By the way, I did coin the term "top-lit updraft" and the acronym
"TLUD" back in 2004 and 2005 respectively, but that is not the
same as originating it or initially identifying it. Wendelbo had
no name for what was happening. (Peko Pe is the stove name.)
And Tom Reed called it "inverted down-draft" or IDD, which
actually it is not, because down-draft gasifiers have their hot
zones at the bottom all of the time. Actually, with hindsight, I
should have called it something like "Top-Lit, Downward Migrating
Pyrolysis Zone" (maybe " TLDMPZ") because the MIGRATING PYROLYSIS
FRONT is by far the most distinctive feature of TLUD gasifiers.
The real important feature is that the hot spot does not stay in
one position, but migrates downward. In that way it is unlike
any other up-draft or down-draft or cross-draft gasifiers, in
which the fuel moves and the hot spot stays in one position (which
is at the bottom on up-draft AND down-draft gasifiers.) <br>
<br>
I hope this helps clarify some of the background about TLUD
stoves.<br>
<br>
Paul<br>
<br>
<pre class="moz-signature" cols="72">Paul S. Anderson, PhD aka "Dr TLUD"
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>
On 9/18/2012 11:24 AM, Crispin Pemberton-Pigott wrote:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Dear
Steve<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">That
was an interesting excursion. To be brief, there are a great
number of technical misconceptions contained in the document
</span><span style="color:#1F497D"><a moz-do-not-send="true"
href="http://www.soil-carbon-regeneration.co.uk/biochar/wp-content/uploads/2012/05/Biochar-Rocket-Stove-building-instructions.pdf">http://www.soil-carbon-regeneration.co.uk/biochar/wp-content/uploads/2012/05/Biochar-Rocket-Stove-building-instructions.pdf</a>
</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">so
my advice is to try to gain some knowledge from the general
approach and from the unusual layout of the product but not
take it all as literally true. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">It
is interesting that anything with a side feed is being
termed a Rocket Stove. That rather undermines the actual
Rocket Stove as a unique design, in my view. I guess people
will call it what they want.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I
have copied here a paragraph from a the document:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span
style="font-family:"Arial-BoldMT","sans-serif";mso-fareast-language:EN-US">The
tlud</span></b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"ArialMT","serif";mso-fareast-language:EN-US">Designed
by Paul Anderson, the top light upward draught (tlud)
gasifying cook stove works on more than just one level. It
is a very efficient cook stove, producing a lot of heat from
a small amount of wood. It is smokeless and it produces
biochar. Paul Anderson has also been instrumental in getting
these stoves distributed and used in developing countries
where wood or charcoal is otherwise used in conventional
fires for cooking. By being more efficient, less wood is
needed. By being smokeless, diseases and deaths caused by
smoke in living spaces are reduced. By producing biochar,
subsistence growers are able to [maintain] soil fertility
and improve soil structure, biological activity and moisture
holding capacity. Atmospheric carbon is also being
sequestered by the use of these stoves.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">So,
I have some issues with some of this and because the whole
list was referred to it there is merit in correcting some of
the impressions given.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The
TLUD was invented centuries ago as a way to burning with
little smoke. The Romans used TLUD fires. A TLUD cooking
stove may or may not be ‘efficient’ depending entirely on
how well it transfers heat from the flame to the pot and
whether or not the remaining char( if any) is counted as
‘consumed by the stove’ or not. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The
heat produced by a TLUD is no greater than the heat released
by burning the same amount of fuel to the same extent in any
other stove. That is, if you gasify wood in some other
device the heat is exactly the same. TLUD’s are renowned for
making lots of smoke when things are not working properly,
like in the beginning and at the end of a burn there can be
lots of smoke. Mitigation of this involves timely
intervention by the cook. They are, after all, smoke
producing devices that then burn the smoke. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">You
have no doubt seen Paul Anderson throwing a lit match into a
smoke bomb of a stove re-lighting the fire when it has blown
out. I have done it myself dozens of times. When they are
running well, especially during the main part of the burn,
they are amazingly smokeless, like any other really good
biomass stove. I hope that the products evolve to the extent
that they really are smokeless.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<br>
</div>
</blockquote>
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