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style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'">Julien
and all,</SPAN><SPAN
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style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'"></SPAN> </P>
<P style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'">May
16 Julien proposed a way of improving the method 3 turn-down arrangement by
perching char on an upper grate. I have tried this and found that it does
work. I have only made it work and have not done any measurements yet to get
turn down ratio. From flame size I would estimate no less than 3 to 1 and
probably closer to 4 to 1. Attached is a diagram showing some observations
made during the successful trial. It was the fourth trial that finally worked.
This being a variation of method 3, it should probably be designated Method
3.2 or 3B. </SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt; mso-fareast-font-family: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'"></SPAN> </P>
<P style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'">During
the test, one thing that I tried was to make quick adjustments from low to
high and high to low. This could easily happen during field use and so it is
important to know how the method responds. Method 1 has the problem that quick
adjustments can blow the flame out. This method however stubbornly kept the
flame going. From high to low, after a quick adjustment, the flame took about
one minute to reduce to a small flame, and continued over several minutes to
reduce to a very small flame. Some puffs of visible smoke came out but very
little. From low to high the flame again took about a minute to enlarge to a
high flame. Considerable puffs of visible smoke came out but stopped after the
large flame became stable. The flame however remained alive and that is very
important for field use.</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt; mso-fareast-font-family: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'"></SPAN> </P>
<P style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'">As
with the other methods, it is possible for the flame be stable but be so small
that the temperature cools and allows unburned aromatic hydrocarbons to exit
the stove. This could be a problem since some of these hydrocarbons are
toxic. A stove using this method should be designed to
allow some primary air leakage into the reactor so that it cannot be
adjusted this low.</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt; mso-fareast-font-family: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'"></SPAN> </P>
<P style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'">I
need to continue with a wonderful idea from Dr. Larson for reducing the flame
height and thus the stove height, so I will not be working on turn-down Method
3.2 or 3B for a while. I will have a demonstration of this turn-down method at
stove camp at Aprovecho this July.</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt; mso-fareast-font-family: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'"></SPAN> </P>
<P style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'">Kirk</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt; mso-fareast-font-family: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P style="MARGIN: 0in 0in 10pt" class=MsoNormal><FONT size=3
face=Calibri>Santa Rosa, CA. USA</FONT></P></DIV>
<DIV style="FONT: 10pt arial"> </DIV>
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=winter.julien@gmail.com href="mailto:winter.julien@gmail.com">Julien
Winter</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=kgharris@sonic.net
href="mailto:kgharris@sonic.net">Kirk Harris</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Cc:</B> <A title=psanders@ilstu.edu
href="mailto:psanders@ilstu.edu">Paul Anderson</A> ; <A
title=ronal.larson@gmail.com href="mailto:ronal.larson@gmail.com">Ronal
Larson</A> ; <A title=crispinpigott@outlook.com
href="mailto:crispinpigott@outlook.com">Crispin Pembert-Pigott</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, May 16, 2014 5:06 AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Perched Charcoal and Pilot
Secondary Air</DIV>
<DIV><BR></DIV>
<DIV dir=ltr>
<DIV>Hello Kirk;</DIV>
<DIV><BR></DIV>
<DIV>In you work with sustaining low power rates in a TLUD you propose a
"<FONT size=+0>Method 3 Char-supported method"</FONT></DIV>
<DIV><FONT size=+0></FONT><BR></DIV>
<DIV>Instead of moving the charcoal bed upwards, would it help to keep some of
the charcoal perched on an upper grate, or ring-shaped ledge grate, plus
introduce a small amount of secondary air below the perch through pilot
holes?</DIV>
<DIV><BR></DIV>
<DIV>Nice work,</DIV>
<DIV>Julien<BR clear=all><BR>-- <BR></DIV>
<DIV dir=ltr>Julien Winter<BR>Cobourg, ON,
CANADA<BR></DIV></DIV></BLOCKQUOTE></BODY></HTML>