<div dir="ltr"><div><div><div><div><div><div><div><div><div><div>Why burn wet wood?<br></div></div>Designing stoves around improperly prepared fuels is a real headache.<br><br></div>The same logic applies to coal.Coal preparation facilities run coal through centrifuges and other devices to bring down the moisture content.<br>
</div></div>Every percentage of moisture or ash takes away from the BTU content of the coal.It is so inefficient to burn dirty coal or coal of a high moisture content.<br></div><br></div>Some say that there is no such thing as a bad fuels, just bad stoves. Just ask anyone in the coal industry if there is any such thing as a bad coal.<br>
</div></div>They will immediately point to many things that could make coal unfit for combustion. They will point to things such as moisture content, ash content, sulfur content, grindability, ash fusion temperature, grain size, MAF calorific value, volatile matter content, fixed carbon content and much more. Imagine how inefficient the coal industry would be if it had to design power stations around each type of bad coal presented to it.<br>
</div><div><br></div><div>If we prepare fuels correctly, designing stoves is so easy. We focus far too much on designing stoves and surely not enough on preparing fuels. This is the big mistake that most funding organizations make in their promotion of clean cook stoves.<br>
<br></div><div>Thanks.<br></div><div>Paul Olivier<br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Jun 13, 2013 at 8:34 AM, Paul Anderson <span dir="ltr"><<a href="mailto:psanders@ilstu.edu" target="_blank">psanders@ilstu.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<div>Crispin,<div class="im"><br>
<br>
<blockquote type="cite">Some TLUD's heat pretty much all the wood
at once (they vary). </blockquote></div>
Please describe in detail. I want to know what you call a TLUD
in this case.<br>
<br>
Paul<br>
<br>
<br>
<br>
<pre cols="72">Paul S. Anderson, PhD aka "Dr TLUD"
Email: <a href="mailto:psanders@ilstu.edu" target="_blank">psanders@ilstu.edu</a> Skype: paultlud Phone: +1-309-452-7072
Website: <a href="http://www.drtlud.com" target="_blank">www.drtlud.com</a></pre><div><div class="h5">
On 6/12/2013 11:04 AM, Crispin Pemberton-Pigott wrote:<br>
</div></div></div>
<blockquote type="cite"><div><div class="h5">
<div>
<p>Dear Dale<u></u><u></u></p>
<p><u></u> <u></u></p>
<p>I believe it is easiest to burn wet wood
in a continuous feed fashion. I have had some recent
experience in Indonesia trying burn wet (pretty damp) wood in
a TLUD. Some TLUD's heat pretty much all the wood at once
(they vary). When that happens there is a huge burst of
moisture in the emissions. This is visible on the HPT data
quality check chart as depressed∑O<sub>2</sub> and ∑CO<sub>2</sub>
lines (they should depress in synch). The evaporation of all
the moisture early makes for problems later because then the
wood it so dry it won’t stop self-pyrolysing. In other words
if combustion conditions favour wet wood, later they do not
favour dry wood remaining.<u></u><u></u></p>
<p><u></u> <u></u></p>
<p>Tom has some experience, as does
UK-Andrew in burning pretty wet biomass. The essential point
is to keep the primary combustion zone hot enough to run the
fire and still evaporate all that moisture. Heat recycling is
by far the easiest way to do that.<u></u><u></u></p>
<p><u></u> <u></u></p>
<p>Good to hear from you. Any recent
experiments to repot? I have missed your great lab work.<u></u><u></u></p>
<p><u></u> <u></u></p>
<p>Regards<br>
Crispin<u></u><u></u></p>
<p><span lang="EN-US"><u></u> <u></u></span></p>
<p><span lang="EN-US"><u></u> <u></u></span></p>
<p><span lang="EN-US">+++++++<u></u><u></u></span></p>
<p><span lang="EN-US"><u></u> <u></u></span></p>
<p>Have we ever looked at the question of
how to design a stove to burn wood that is higher in
moisture? It would seem that this is very important practical
issue, and that a stove that could burn wet wood would be very
popular. What makes a stove burn wet wood well or poorly?<u></u><u></u></p>
<p>The only time I remember someone saying
something about this was Crispin, who I believe said recently
that preheating the primary air makes it possible to burn
wetter wood. This would be easy with a batch stove, harder
with continuous feed. Other than that, I can think of a
couple things that might help burn wetter wood. <u></u><u></u></p>
<p><u></u> <u></u></p>
<p>Dale Andreatta <u></u><u></u></p>
</div>
<br>
<fieldset></fieldset>
<br>
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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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