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<div class="moz-cite-prefix">Dean,<br>
<br>
Please tell us about those pellets: characteristics and source
and used in what stove(s). The experience by Awamu in Uganda
does not agree with your statement. But there could be different
sources and different stoves.<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>
On 3/6/2014 1:20 PM, Dean Still wrote:<br>
</div>
<blockquote
cite="mid:CA+tShZu1kxuVCBb4fQfPZW54tAOa4JyzgwU=2vDLicPj2NTHhg@mail.gmail.com"
type="cite">
<div dir="ltr">Hi Tom,
<div><br>
</div>
<div>In Uganda the pellets were too dense and were hard to
light. Do you know the density of USA heating stove pellets?</div>
<div><br>
</div>
<div>Best,</div>
<div><br>
</div>
<div>Dean</div>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Thu, Mar 6, 2014 at 11:02 AM, Tom
Miles <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:tmiles@trmiles.com" target="_blank">tmiles@trmiles.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="white" link="blue" vlink="purple" lang="EN-US">
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Richard,</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">You
probably mean 0.6 g/cm3 (37 lb/ft3) which is very
good that’s better than most commercial wood
pellets. For reference the dry density of sawdust is
often about .160 g/cm3 (or 10 lb/ft3). The loose
density of straw is about 0.08 g/cm3 or (5 lb/ft3).
The press roll on a pellet mill exerts about 142
bars (2000 psig). If you can get those densities by
selecting materials, wetting, pressing at 12 bar and
drying you are doing very well. </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><br>
Tom</span></p>
<p class="MsoNormal"><a moz-do-not-send="true"
name="14498c779ba49ea1__MailEndCompose"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></a></p>
<div>
<div style="border:none;border-top:solid #b5c4df
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
Stoves [mailto:<a moz-do-not-send="true"
href="mailto:stoves-bounces@lists.bioenergylists.org"
target="_blank">stoves-bounces@lists.bioenergylists.org</a>]
<b>On Behalf Of </b>Legacy Found<br>
<b>Sent:</b> Thursday, March 06, 2014 10:46 AM<br>
<b>To:</b> Discussion of biomass cooking stoves<br>
<b>Subject:</b> Re: [Stoves] Cuber and size of
densifying machines. (no longer Re: The wood and
char and fuel "debate" )</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<div>
<p class="MsoNormal">Crispin, what densities are you
seeking. We have seen densities of up to 0.6kg/cm^3
by use of really fine granular material charcoal
sawdust and certain other ag residues as infiller in
hand presses generating only about 12 bars pressure.</p>
</div>
<div>
<p class="MsoNormal">I have not attempted pellet
production but have no doubt that high pressure is
not needed: Rather its more about attention to
blend particle density and size and variations
between these (sorting coefficients) that makes the
difference density wise. </p>
</div>
<div>
<p class="MsoNormal">May look into it if anybody is
interested in the fuel pellet world.</p>
</div>
<div>
<p class="MsoNormal">Richard<br>
<br>
Sent from my iPhone</p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt">
<br>
On Mar 6, 2014, at 11:38, Crispin Pembert-Pigott
<<a moz-do-not-send="true"
href="mailto:crispinpigott@outlook.com"
target="_blank">crispinpigott@outlook.com</a>>
wrote:</p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Dear
Friends</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I
agree with Dean on this score. The air flow
through the pellets strongly affects the way
they burn if the device is constructed such
that the fuel contributes a significant
element of air control.</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">These
devices</span></p>
<p class="MsoNormal"><image002.jpg></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal">
<span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Are
‘cubers’ in that they are producing densified
lumps that can be put into a stove. But they
will work best in a large stove such as is
used in China for space heating and cooking.
The input material is straw and other stover.</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">The
mechanism is an eccentric roller running
inside a perforated cage at maybe 60-100 RPM.
As Tom notes, power consumption is about 110
kW.</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">So
far I don’t think the product is economically
viable as there is a subsidy involved. What we
need is a breakthrough technology that will
make densified fuel without the need for heat.</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Regards</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Crispin</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span></b></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<div>
<p class="MsoNormal">Hi Paul,</p>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">I have seen the very
small pellets sold for heating stoves in the
US burn very cleanly. Larger sized pellets
did not burn as cleanly. </p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">Best,</p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">Dean</p>
</div>
</div>
</div>
</div>
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