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Crispin,<br>
<br>
In one sentence you say:<br>
<blockquote type="cite"><span style="color:#1F497D">The top lit
version does not mean an MPF. You can only really get an MPF if
it is a packed bed gasifier and virtually no one is doing that.</span></blockquote>
And then say:<br>
<blockquote type="cite"><span style="color:#1F497D">Bottom lit
updraft (BLUD) is common, and TLUD is also common. MPF is not
going to be seen, not a real one. That would require complete
air control and there is no attempt to do that in an mbaula.</span></blockquote>
So, please do not confuse the TLUD (which is MPF) with something
that is lit at the top maintains its burning at the top. This
research paper is clearly NOT referring to what has become known as
the TLUD micro-gasifier. <br>
<br>
Yes, people can light fires at the top. They can be just regular
fires. Light them at the bottom and they are just regular fires.
That is why I am emphasizing MPF as being the important
characteristic of TLUD stoves. Others that are LIT on the top or
bottom are not necessarily gasifiers. <br>
<br>
The designations of UP and DD for updraft and downdraft are term for
GASIFIERS (PHYSICAL DEVICES) WHERE THERE IS AN INTENTIONAL AND CLEAR
SEPARATION OF WHERE AND WHEN THE GASES ARE CREATED AND WHERE AND
WHEN THE GASES ARE BEING BURNED. <br>
<br>
A TLUD is a gasifier. Lighting coal or wood in a bucket is not a
gasifier. All fires involve gasification (a process), but that
does not make the device (bucket, open air, tube, whatever)
automatically to be a gasifier DEVICE. <br>
<br>
Paul<br>
<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 9/20/2015 9:34 AM, Crispin
Pemberton-Pigott wrote:<br>
</div>
<blockquote
cite="mid:COL401-EAS32785EBA4CF73FEE2494608B1470@phx.gbl"
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<div class="WordSection1">
<p class="MsoNormal"><span style="color:#1F497D">Dear Paul<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">></span>Please
confirm: Something like a bucket with holes in the bottom.
<span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Yes.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal">No upper extension. <span
style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Added during
ignition. Removed once coked. Behaviour varies.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal">No attempt to have a TLUD-type concentrator
or directed horizontal entrance of the secondary air. <span
style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">That is not
special to TLUD’s. Upper holes serve as horizontal air
entrances.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal">Just light one at the bottom (bottom
burning only - BB) and the other at the top (meaning that the
pyrolytic front will be moving downward through the stack of
fuel, as migratory pyrolytic front MPF until it reaches the
bottom.) <br>
<br>
<span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The two
approaches are used. Top lit is advertised as ‘improved’ but
it goes back a long way. The top lit version does not mean
an MPF. You can only really get an MPF if it is a packed bed
gasifier and virtually no one is doing that.<o:p></o:p></span></p>
<p class="MsoNormal"><br>
2. So the fuel-bed temperatures were always measured in the
bottom of the BB unit, but were measured at the position of
the MPF as the MPF progressed downward. Right? If not,
please describe.<br>
<br>
<span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Don’t know.<o:p></o:p></span></p>
<p class="MsoNormal"><br>
3. How did the experimenters control (make hotter or less
hot) the fuel bed temperatures? <span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Don’t know. I
don’t think they did.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal">4. How deep is the pile of coal fuel?<span
style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Typical is <
150mm.</span><br>
<br>
5. Please describe the "secondary" burning. Flames
flickering on the top? tall, short, etc.<br>
<br>
<span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Tall in the
beginning and short after pyrolysis.<o:p></o:p></span></p>
<p class="MsoNormal"><br>
6. And which way (BB or MPF) is the common practice in South
Africa?<br>
<br>
<span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Bottom lit
updraft (BLUD) is common, and TLUD is also common. MPF is
not going to be seen, not a real one. That would require
complete air control and there is no attempt to do that in
an mbaula.</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif;color:#1F497D;mso-fareast-language:EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-CA">Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-CA">Crispin<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-CA"><o:p> </o:p></span></p>
</div>
<br>
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