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<DIV><FONT size=2 face=Arial>Roberto,</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Nice. I would like to see test results for
particulates. It should be very clean. It looks like it is
loosely based on Crispins flame tube design with holes added in the tube where
the Venturi low pressure area is. The holes are at the bottom of the
burner, so there is better draft and a good burning area above.
If I understand correctly Crispin is using the tube differently, to
concentrate the heat and increase the dwell time for the flame in that hot
environment. His secondary air is all added before the flame tube.
Your design looks more compact and perhaps would be a better choice for a
TLUD. </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>There is a limit to how much gas the burner can
handle. When the foil is removed and more primary air is added the burner
is overloaded with gas and a tall diffusion flame forms. I have been
trying to handle this problem by adding more mixing capability, and have
had some improvment, but further work is needed. The problem with the
mixing tubes I am using is that along the edges of the combustor, the air
exiting the tubes exits at an angle instead of straight out. This holds
the gasses below the burner along the edges, and adds to blowing them
to the center, overloading the center of the mixer and wasting air at the edges
of the combustor. This would not be a problem with your design.
You might be able to use two or three of theses mixers side by side to gain
a clean higher fire power. </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>The concentrator ring is intended to mix the
wood gas and air, and the Venturi mixer is intended to mix the wood gas and the
air, so you have a duplicate mixing system. I am not saying good or bad,
just something I notice. </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>I see Julian has expressed some doubts about the
Venturi concept. Good for him. I would be very happy if someone with
adiquate equipment and technical ability proved or disproved the TLUD Venturi
concept, either way. I perhaps will have to bite the bullet and buy a
manometer with the ability to measure down to .001 inch of water column.
My rather primative home made manometer did show a slight pressure drop at the
mixer, but not enough to get any measurments. Our local college
science department didn't seem to be interested.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Attached are some photos of the primary control
valve I am currently using very successfully. It looks like something
similar might work for you.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Good work Roberto, </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Kirk</FONT></DIV>
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dir=ltr>
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=roberto.poehlmann@gmail.com
href="mailto:roberto.poehlmann@gmail.com">Roberto Poehlmann</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=stoves@lists.bioenergylists.org
href="mailto:stoves@lists.bioenergylists.org">stoves@lists.bioenergylists.org</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, October 06, 2015 5:53
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [Stoves] TLUD pellets stove with
a venturi burner.</DIV>
<DIV><BR></DIV>
<DIV dir=ltr>
<DIV>Hi,</DIV>
<DIV><BR></DIV>
<DIV>This is a video of one of my prototypes of a TLUD pellet stove.</DIV>
<DIV><FONT size=2 face=Arial></FONT><BR></DIV>
<DIV>The difference with a "normal" TLUD burner, is that it has a 3 inch tube
with secondary air holes after the concentrator ring.<BR></DIV>
<DIV>On top of the the tube, i put a cone to expand the path of the gases, to
shorten the flame, and to have a little internal chimney for draft.</DIV>
<DIV><BR></DIV>
<DIV>One advantage of this burner, is that you can also burn all of the
charcoal made at the pyrolysis stage, with a nice secondary blue flame (if you
wish) .</DIV>
<DIV><BR></DIV>
<DIV><A
href="https://youtu.be/uXMeGcZEYX0">https://youtu.be/uXMeGcZEYX0</A><BR></DIV><BR
clear=all>
<DIV>
<DIV class=gmail_signature>Greetings<BR>Roberto Poehlmann</DIV></DIV>
<DIV class=gmail_signature>Valdivia, Chile.</DIV></DIV>
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