See comments.<br><br><div class="gmail_quote">On Wed, Oct 12, 2011 at 8:30 AM, Kevin <span dir="ltr"><<a href="mailto:kchisholm@ca.inter.net">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 bgcolor="#ffffff">
<div><font face="Arial" size="2">Dear Paul</font></div>
<blockquote style="border-left:#000000 2px solid;padding-left:5px;padding-right:0px;margin-left:5px;margin-right:0px" dir="ltr"><div class="im">
<div style="font:10pt arial">----- Original Message ----- </div>
<div style="font:10pt arial;background:#e4e4e4"><b>From:</b>
<a title="paul.olivier@esrla.com" href="mailto:paul.olivier@esrla.com" target="_blank">Paul
Olivier</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> Tuesday, October 11, 2011 9:44
PM</div>
<div style="font:10pt arial"><b>Subject:</b> Re: [Stoves] High mass space
heating options Re: Rocket Stove forthe PLACE</div>
<div><br></div>
</div><div>...del...</div><div class="im">
<div> </div>
<div>For example, one kg of rice hulls produces about $0.21 in gas but only
about $0.07 in biochar.<br>In other words, biochar comes in at only one third
of the value of the gas.</div>
<div> </div>
</div><div><font face="Arial" size="2"># Very interesting!! </font></div><font face="Arial" size="2"></font></blockquote>
<blockquote style="border-left:#000000 2px solid;padding-left:5px;padding-right:0px;margin-left:5px;margin-right:0px" dir="ltr">
<div><font face="Arial" size="2">1: Does the 1.0 kG of rice hulls yield EITHER
$.21 of gas OR $.07 worth of char</font></div>
<div><font face="Arial" size="2">OR, </font></div>
<div><font face="Arial" size="2">does it yield $.21 worth of gas + $.07 of char,
total $.28 per kG?</font></div></blockquote></div></blockquote><div>It's not "or" but "plus".<br>Another way to put it is one metric ton of rice hulls is worth $283 US in gas <u>and </u>biochar.<br>
<br> </div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div bgcolor="#ffffff"><blockquote style="border-left: 2px solid rgb(0, 0, 0); padding-left: 5px; padding-right: 0px; margin-left: 5px; margin-right: 0px;" dir="ltr">
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">2: What is the weight yield of biochar from 1 kG
of rice hull?</font></div></blockquote></div></blockquote><div><br>From 30% to 50% by weight: this depends on the rate of gasification.<br> <br></div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div bgcolor="#ffffff"><blockquote style="border-left: 2px solid rgb(0, 0, 0); padding-left: 5px; padding-right: 0px; margin-left: 5px; margin-right: 0px;" dir="ltr">
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">3: Are the people actually using this biochar for
agricultural purposes?</font></div></blockquote></div></blockquote><div><br>Yes, it is commonly used throughout Vietnam. <br></div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div bgcolor="#ffffff"><blockquote style="border-left: 2px solid rgb(0, 0, 0); padding-left: 5px; padding-right: 0px; margin-left: 5px; margin-right: 0px;" dir="ltr">
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">Thanks!!</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">Kevin</font></div><div><div></div><div class="h5">
<div><br>Biochar production therefore is a by-product of gas
production.<br>But if the the rice hull can be obtained, as is usually the
case, free-of-charge,<br>and if biochar can be sold at a nice profit,<br>then
gas is produced at a negative cost.<br>Also note that when rice hulls are
properly gasified,<br>no smoke is produced.<br>So in producing gas, one earns
a profit in the sale of biochar.<br>The big economic driver in this instance
is the production of gas.<br><br>There are people in Vietnam who know nothing
about the value of rice hull gas,<br>and they are busy each day making rice
hull biochar in crude retorts.<br>These low-temperature retorts emit clouds of
smoke that can be seen from miles around.<br>Focusing only on biochar
production, these people do a lot of damage to the environment and should be
shut down.<br>The biochar that they produce is anything but
uniform.<br><br>For more on this, see: <br><a href="http://dl.dropbox.com/u/22013094/Paper/park.pdf" target="_blank">http://dl.dropbox.com/u/22013094/Paper/park.pdf</a><br>See
the section on gasification starting on page 79.<br>I am a big believer in
utilizing a multiplicity of approaches with regard to
biomass.<br><br>Thanks.<br>Paul Olivier<br>Vietnam<br><br></div>
<div class="gmail_quote">On Wed, Oct 12, 2011 at 6:40 AM, Steve Taylor <span dir="ltr"><<a href="mailto:steve@thetaylorfamily.org.uk" target="_blank">steve@thetaylorfamily.org.uk</a>></span>
wrote:<br>
<blockquote style="border-left:#ccc 1px solid;margin:0px 0px 0px 0.8ex;padding-left:1ex" class="gmail_quote"><br><br>
<div class="gmail_quote">
<div>On 11 October 2011 17:55, Fireside Hearth <span dir="ltr"><<a href="mailto:firesidehearthvashon@hotmail.com" target="_blank">firesidehearthvashon@hotmail.com</a>></span> wrote:<br>
<blockquote style="border-left:#ccc 1px solid;margin:0px 0px 0px 0.8ex;padding-left:1ex" class="gmail_quote">
<div>
<div dir="ltr">Dear Steve,<br><br>
I spent most of my adult life teaching people how to heat their homes
without smoke coming from the chimney, when I see pictures of areas where
bio char is being made I see horrible air pollution from the
fires,<br></div></div></blockquote></div>
<div><br>I see "biochar" being used as an excuse for burning to clear land
rather than the emissions generated being considered pollution from the
process of making it. <br><font color="#888888"><br>Steve
<br></font></div></div>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Paul A. Olivier PhD<br>27C Pham Hong Thai Street<br>Dalat<br>Vietnam<br><br>Louisiana telephone: 1-337-447-4124 (rings Vietnam)<br>Mobile: 090-694-1573 (in Vietnam)<br>
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