<div dir="ltr"><div>Kevin,<br><br></div>You write:<br><br><i><span style="font-family:'Arial','sans-serif'">In Paul O's case, where he is interested in char
making, I would guess that most of the siliceous components would remain
embedded within the char particles, in a safe and non-hazardous manner.
However, some ash particles would be liberated in that some of the char would
be burned in the pyrolysis process. </span></i>
<div>
<p class="">Does char get "burned" in the sense of being fully oxidized? I do not think that this should happen under normal operating conditions. If the biomass is uniform and if channeling does not occur, then there should not be pockets where char has been reduced to ash. This only happens when too much oxygen is supplied in one particular area of the reactor, as when channeling occurs. When this happens the reactor wall gets extremely hot, and CO2 is emitted at some of the burner holes.</p>
<p class="">That is why I believe that it is most helpful to work with a burner that has a series of burner holes. <i>If CO2 is being generated, the operator spots this in an instant.</i> I did not make a single change to the original burner design that I inherited from Belonio. Any attempt to change the diameter of the holes or distance between holes did not work at all. But I did figure out how to scale up his burner design for much larger reactor diameters.</p>
<p class="">The Belonio burner forces all of the syngas to the outside of the burner. This is very important. This makes it easy to supply secondary air all along the periphery of the burner. This I accomplished by means of a housing that horizontally forces air into the vertically rising jets of gas. Until I added a burner housing, all that I got out of the Belonio burner was a long diffusion flame. With the housing, all of the flameletts stay neatly under the pot.</p>
<p class="">Thanks.</p><p class="">Paul<br></p><p class=""><br></p><p class=""><br></p><p class=""><br></p></div><br><br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Jun 18, 2013 at 9:08 PM, Kevin <span dir="ltr"><<a href="mailto:kchisholm@ca.inter.net" target="_blank">kchisholm@ca.inter.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>
<div link="blue" bgcolor="white" vlink="purple" lang="EN-CA">
<div><font face="Arial">Dear Crispin</font></div>
<blockquote style="BORDER-LEFT:#000000 2px solid;PADDING-LEFT:5px;PADDING-RIGHT:0px;MARGIN-LEFT:5px;MARGIN-RIGHT:0px"><div class="im">
<div style="FONT:10pt arial">----- Original Message ----- </div>
<div style="FONT:10pt arial;BACKGROUND:#e4e4e4"><b>From:</b>
<a title="crispinpigott@gmail.com" href="mailto:crispinpigott@gmail.com" target="_blank">Crispin
Pemberton-Pigott</a> </div>
<div style="FONT:10pt arial"><b>To:</b> <a title="stoves@lists.bioenergylists.org" href="mailto:stoves@lists.bioenergylists.org" target="_blank">'Discussion of biomass cooking
stoves'</a> </div>
</div><div class="im"><div style="FONT:10pt arial"><b>Sent:</b> Friday, June 14, 2013 6:37 PM</div>
<div style="FONT:10pt arial"><b>Subject:</b> Re: [Stoves] Insulation and
stove life</div>
<div><br></div>
</div><div><div class="im">
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt">Dear
Kevin<u></u><u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt">I
think it is pretty obvious that a fan-powered stove will loft a lot more small
particles than a natural draft version. They can easily be blown up through
the fuel bed. If it is chimney-type ND stove then it is not such an
issue.</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt"></span> </p>
</div><p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt">#
Agreed. However, the big thing is the need for test work to quantify the
nature and extent of such particles. A forced draft system that puts a large
quantity of the small particles into the atmosphere of the Living space is
certainly a problem. </span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt"></span> </p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt">Best
wishes,</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt"></span> </p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt">Kevin</span></p><div class="im">
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt">Regards<br>Crispin<u></u><u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt"><u></u> <u></u></span></p>
<div>
<div style="BORDER-BOTTOM:medium none;BORDER-LEFT:medium none;PADDING-BOTTOM:0mm;PADDING-LEFT:0mm;PADDING-RIGHT:0mm;BORDER-TOP:#e1e1e1 1pt solid;BORDER-RIGHT:medium none;PADDING-TOP:3pt">
<p class="MsoNormal"><b><span style="FONT-FAMILY:'Calibri','sans-serif';FONT-SIZE:11pt" lang="EN-US">++++++++</span></b><span style="FONT-FAMILY:'Calibri','sans-serif';FONT-SIZE:11pt" lang="EN-US"><u></u><u></u></span></p>
</div></div>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal"><span style="FONT-FAMILY:'Arial','sans-serif'">Dear
Crispin</span><u></u><u></u></p></div>
<div>
<p class="MsoNormal"> <u></u><u></u></p></div>
<div>
<p class="MsoNormal"><span style="FONT-FAMILY:'Arial','sans-serif'">Thanks very
much for your helpful comments. </span><u></u><u></u></p></div>
<div>
<p class="MsoNormal"> <u></u><u></u></p></div>
<div>
<p class="MsoNormal"><span style="FONT-FAMILY:'Arial','sans-serif'">Clearly, a
chimney that vents products of combustion outside the Living Space is
advantageous, compared to a stove system that vents into the Living Space.
</span><u></u><u></u></p></div>
<div>
<p class="MsoNormal"> <u></u><u></u></p></div>
<div>
<p class="MsoNormal"><span style="FONT-FAMILY:'Arial','sans-serif'">I was aware
of the great importance of the size of the Particulate Matter. Basically, "big
dirt particles" are not nearly as bad as are fine particles that can lodge
deep in the lungs. Clearly also, "more bad-sized particles", with "bad type
composition", are worse than fewer "safer sized particles", of "relatively
neutral composition.</span><u></u><u></u></p></div>
<div>
<p class="MsoNormal"> <u></u><u></u></p></div>
<div>
<p class="MsoNormal"><span style="FONT-FAMILY:'Arial','sans-serif'">The only
way to "digitize the generalities" is with a scientifically sound test program
that identifies and then measures the relevant parameters. Once numbers have
been attached to the relevant parameters, then it is relatively easy to
determine whether or not a given stove system is "safe" or
"hazardous."</span><u></u><u></u></p></div>
<div>
<p class="MsoNormal"> <u></u><u></u></p></div>
<div>
<p class="MsoNormal"><span style="FONT-FAMILY:'Arial','sans-serif'">Rice Hulls
are very interesting. While they have a high percentage of highly siliceous
ash, complete combustion could potentially make the ash available in a
hazardous manner. In Paul O's case, where he is interested in char
making, I would guess that most of the siliceous components would remain
embedded within the char particles, in a safe and non-hazardous manner.
However, some ash particles would be liberated in that some of the char would
be burned in the pyrolysis process. </span><u></u><u></u></p></div>
<div>
<p class="MsoNormal"> <u></u><u></u></p></div>
<div>
<p class="MsoNormal"><span style="FONT-FAMILY:'Arial','sans-serif'">Best
wishes,</span><u></u><u></u></p></div>
<div>
<p class="MsoNormal"> <u></u><u></u></p></div>
<div>
<p class="MsoNormal"><span style="FONT-FAMILY:'Arial','sans-serif'">Kevin</span><u></u><u></u></p></div></div></div>
<p>
</p><hr><div class="im">
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<br></blockquote></div><br><br clear="all"><br>-- <br>Paul A. Olivier PhD<br>26/5 Phu Dong Thien Vuong<br>Dalat<br>Vietnam<br>
<br>Louisiana telephone: 1-337-447-4124 (rings Vietnam)<br>Mobile: 090-694-1573 (in Vietnam)<br>Skype address: Xpolivier<br><a href="http://www.esrla.com/" target="_blank">http://www.esrla.com/</a>
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