<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta name=Generator content="Microsoft Word 14 (filtered medium)"><!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Marc,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Producer gas usually ignites where it meets the air. I would have though that you would have seen higher CO in the cylinder. Where did you measure the CO? With a probe or a hood?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Tom<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><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:stoves-bounces@lists.bioenergylists.org] <b>On Behalf Of </b>Marc Pare<br><b>Sent:</b> Friday, January 18, 2013 8:26 PM<br><b>To:</b> Discussion of biomass cooking stoves<br><b>Subject:</b> [Stoves] is this new?<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>So, I was playing around with burners on a Belonio rice husk gasifier last night. <o:p></o:p></p></div><div><p class=MsoNormal>If you're not familiar, there are a bunch of photos of the basic design on google image: <a href="https://www.google.com/search?q=belonio+batch+stove&sugexp=chrome,mod%3D16&um=1&ie=UTF-8&hl=en&tbm=isch&source=og&sa=N&tab=wi&ei=kh76UMnkBOiriAforYHQCw&biw=1282&bih=717&sei=lB76UMTnOaSjigfp3YGgDw">batch stove images</a><o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I slid a metal cylinder into the opening of the top of the reactor, leaving a gap along the sides. Here's a picture:<o:p></o:p></p></div><div><p class=MsoNormal><img border=0 width=504 height=556 id="_x0000_i1025" src="cid:image001.png@01CDF5BC.7DCCC140" alt="Inline image 1"><o:p></o:p></p></div><div><p class=MsoNormal>Now, normally when you take the burner top off of these stoves, there's no combustion inside because there is no secondary air available.<o:p></o:p></p></div><div><p class=MsoNormal>Well, I saw a roaring flame inside after sliding in the metal cylinder (option #2 in the diagram)<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>As far as I can tell, the cylinder acts like a chimney, causing a pressure drop which sucks producer gas from the bed, not allowing it to escape through the gap on the sides. <o:p></o:p></p></div><div><p class=MsoNormal>As a result, secondary air sinks through the gap and you get combustion at the bottom of the cylinder.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Has anyone seen something like this before? I can't think of any examples. I called it a "heat pump" in my field notes.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>With the right dimensions is might be a good auto-regulating burner: more producer gas producers more heat, pulling in more secondary air. <o:p></o:p></p></div><div><div><p class=MsoNormal>I think it could be useful for charcoal stoves as well as TLUDs. <o:p></o:p></p></div></div><div><p class=MsoNormal>I measured lower CO than usual with Belonio burners. Similar excess air levels (though I only tested two sizings of the metal cylinder).<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Marc Paré<br>B.S. Mechanical Engineering<br>Georgia Institute of Technology | Université de Technologie de Compiègne<br><br><a href="http://notwandering.com" target="_blank">http://notwandering.com</a><o:p></o:p></p></div></div></body></html>