<div dir="ltr">Dear Paul and Crispin,<div><br></div><div>My hope is that someone will do the experiments to detail how the work with TLUDs, etc has resulted in progress and publish the results in a peer reviewed journal. It might take a while but it's a job worth doing. Maybe find an interested student or professor to instruct?</div><div><br></div><div>Best,</div><div><br></div><div>Dean</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Dec 16, 2014 at 7:42 AM, Paul Anderson <span dir="ltr"><<a href="mailto:psanders@ilstu.edu" target="_blank">psanders@ilstu.edu</a>></span> wrote:<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<div>Stovers,<br>
<br>
This is about Crispin's story and showing slow progress, but it is
progress. <br>
<br>
On 12/16/2014 12:51 AM, Crispin Pemberton-Pigott wrote:<br>
</div>
<blockquote type="cite">
<div><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u><u></u></span>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">There
are dozens of ways to make a stove work improperly. Paul and
I have tried all of them, I think. Paul told me that a TLUD
fuelled with wood could not be refuelled. We were on the
back patio of my home in Ezulwini Valley in Swaziland and he
went off to do something, leaving a small TLUD can-stove
running,. I fed in some wood vertically and it worked just
fine. I continued to do so and it continued to run long
after it should have gone out. Thus I proved to myself (and
Paul) that TLUD’s can be refuelled but not too much at a
time. OK, that was valuable and contradicted received
wisdom. <br>
</span></p>
</div>
</blockquote>
His story is correct. I remember it well (now that I have been
reminded). But it also tells us something about the progression of
our science. <br>
<br>
Back then, the importance of the MPF (Migratory Pyrolytic Front) had
not been realized. What Crispin did then in 2002 was what
BP-Oorja, Biolite and Philips and others did years later. They
were all trickle feeding additional fuel into the TLUD well above
the pyrolytic zone. Heat from below was (and still is, if you do
it) sufficient to pyrolyze the new fuel by heat WITHOUT the small
flames of the pyrolytic front at that fuel. The char can be fine,
but probably a little different (not made at the higher temperatures
of the MPF). <br>
<br>
And when the MPF reached the bottom, and with new fuel placed on top
of the char (not into the hot zone), the unit switched over to
operating with Bottom Burning (BB) as a rather normal UpDraft
gasifier. And that leads to higher temperatures in the bottom (air
coming onto charcoal) and the need for the different materials (cast
iron, ceramics, special metals) to protect that hot zone.<br>
<br>
As I have written in "Micro-gasification Terminology: An
Instructional Summary of MG", available at my website. See:
<a href="http://www.drtlud.com/wp-content/uploads/2013/11/micro-gasification-terminology-14nov2013.pdf" target="_blank">http://www.drtlud.com/wp-content/uploads/2013/11/micro-gasification-terminology-14nov2013.pdf</a>
<br>
<blockquote type="cite">Therefore, there are actually two types of
TLUD (device name) gasifiers, one being TLUD-MPF and the other
being TLUD-BB. The two types are quite distinctive in operation,
and deserve separate recognition and study. The common usage of
the “TLUD” name today means more than the TL of “Top-Lit” can
signify. ...... snip ... In essence, TLUD is a name for the small
updraft gasifier processes/stoves and is not a description of what
process (MPF or BB) is actually happening. However, we expect that
in common usage, the TLUD name will designate TLUD-MPF, unless the
UD-BB mode is specified.</blockquote>
However, many people continue to ignore the transition from MPF to
BB. Back in 2002 I had no clue about this. Now I consider it
essential knowledge for understanding the variations within
micro-gasification technology. (Note that I wrote
"micro-gasification technology" and not "TLUD technology.")<br>
<br>
I repeat:
<blockquote type="cite">However, we expect that in common usage, the
TLUD name will designate TLUD-MPF, unless the UD-BB mode is
specified.</blockquote>
Of course I can only suggest and request. People will do what they
want to do, sometimes unfortunately.<br>
<br>
Paul<br>
<br>
<pre cols="72">Doc / Dr TLUD / Prof. Paul S. Anderson, PhD
Email: <a href="mailto:psanders@ilstu.edu" target="_blank">psanders@ilstu.edu</a>
Skype: paultlud Phone: <a href="tel:%2B1-309-452-7072" value="+13094527072" target="_blank">+1-309-452-7072</a>
Website: <a href="http://www.drtlud.com" target="_blank">www.drtlud.com</a></pre>
</div>
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