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Crispin, Frank and all,<br>
<br>
Interesting. Some comments:<br>
1. You say
<blockquote type="cite"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif;mso-fareast-language:EN-CA">investigated in a
typical informal brazier/imbaula. </span></blockquote>
Please confirm: Something like a bucket with holes in the
bottom. No upper extension. No attempt to have a TLUD-type
concentrator or directed horizontal entrance of the secondary air.
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>
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>
3. How did the experimenters control (make hotter or less hot) the
fuel bed temperatures? That would be dome by delivery of more
primary air (O2 content) into the bottom of the imbuela units,
right? Used a fan? Or some primary air restricter or
obstruction? And what were the temperatures (high and low) in both
situation><br>
<br>
4. How deep is the pile of coal fuel?<br>
<br>
5. Please describe the "secondary" burning. Flames flickering on
the top? tall, short, etc.<br>
<br>
6. And which way (BB or MPF) is the common practice in South
Africa?<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 9/19/2015 1:22 PM, Crispin
Pemberton-Pigott wrote:<br>
</div>
<blockquote
cite="mid:COL401-EAS3901F276DC14751C8159279B1580@phx.gbl"
type="cite">
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<div class="WordSection1">
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-CA">Dear
Friends<o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-CA">From
the SeTAR Centre group:<o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-CA">“Influence
of fuel-bed temperatures on CO and condensed matter
emissions from packed-bed residential coal combustion”<o:p></o:p></span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span
style="font-family:"Times New
Roman",serif;mso-fareast-language:EN-CA"><a
moz-do-not-send="true"
href="https://www.researchgate.net/publication/281804591_Influence_of_fuel-bed_temperatures_on_CO_and_condensed_matter_emissions_from_packed-bed_residential_coal_combustion?requestFulltext=true">Abstract</a><o:p></o:p></span></b></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif;mso-fareast-language:EN-CA">In this paper,
the influence of fire-ignition methods (which determine the
progression of the pyrolytic zone) and combustion
temperatures on CO and condensed matter (smoke) emissions
during fixed-bed coal combustion were investigated in a
typical informal brazier/imbaula. Particle and gaseous
samples were drawn from the exhaust through a rapid dilution
sampling system (the SeTAR dilution system) before being
channelled to respective gas and particle analysers.
Particle morphologies and chemical composition of the
particles were investigated by a VEGA3 SEM unit with EDS.
Results showed that the propagation of bed temperatures in
fixed-bed residential combustion has an influence on the
characteristics of CO and PM10 emissions. Temperature
stratification was found to depend on the fire-ignition
methods. The top-lit up-draft (TLUD) fire-ignition method
produced less emissions compared to bottom-lit up-draft
(BLUD) fire-ignition method. Bed temperatures and the
propagation front have an impact on aerosol formation and
can highlight differences in the morphology of the emitted
particles and the modes of formation. Increasing combustion
temperature yields a decrease in emissions liquid 'tarry'
substances and super-aggregates (>10 μm) but also leads
to an increase in emissions of sub-micron soot particles.
This work is significant in that there is still scarce
information available in literature on fuel-bed temperature
profiles/stratification for packed-bed residential
coal-burning devices.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
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