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<DIV style="FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: 12pt">
<DIV>Hello gents,</DIV>
<DIV>before making money got back in the way of gassing, I too made this
benchmark. </DIV>
<DIV>I built a few different rolling barrel shaped screens and made some
pressure drop measurements with a mock hearth, knowing that the real thing in
operation would be somewhat different. ending up with several different sized
chips with different pressure drops per size. It seemed to me that I came
to the conclusion that since they are all about the same thickness that the “x”
and “y” measure didn’t seem to make any real change in test or actual use.
the only important revalation I remember is to screen to get the super
fines out and not much changes after that.</DIV>
<DIV>I’m totally with you Pete, If I can’t use wood chips, I’m done, call me
lazy that’s fine. But I still wonder how much energy a guy would spend in
december here in the pacific northwest sifting the fines out and drying the rest
to an accepable level vs the energy made from those now sifted and
dry chips. </DIV>
<DIV>It seems like you have to tumble those things to get them to dry out in a
confined space, as they can sit wet forever in an open bucket and will never dry
out. The other option is spread them out thin over acerage on a nice day,
and then gather them back up.</DIV>
<DIV>either way it kinda takes the thrill out of gassing.</DIV>
<DIV>I will take it one step further, than you Pete, if I can’t shovel wet/green
chips into a hopper and make the thing work, then I’m checking out. I plan
on working on drying them on delivery from the hopper to the hearth as they flow
between the two. Next time I have some “free time”.</DIV>
<DIV>I suppose a guy could do a preliminary energy calculation just for
fun. </DIV>
<DIV>Energy required to bring “x”pounds of soaked and green wood chips at 60%
water down to one pound of 20% water wood chips. Vs the energy that
can be made from that pound of dried wood chips.</DIV>
<DIV>Note,, vent the evaporated wood moisture outside, or everything in your
shop will get wet and rust in a very quick manner.</DIV>
<DIV>Roger that,,,, “along way to go” </DIV>
<DIV>Fuel prep sucks.</DIV>
<DIV>Luke</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV
style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none">
<DIV style="FONT: 10pt tahoma">
<DIV> </DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A title=kchisholm@ca.inter.net
href="mailto:kchisholm@ca.inter.net">Kevin</A> </DIV>
<DIV><B>Sent:</B> Wednesday, April 11, 2012 4:09 PM</DIV>
<DIV><B>To:</B> <A title=gasification@lists.bioenergylists.org
href="mailto:gasification@lists.bioenergylists.org">Discussion of biomass
pyrolysis and gasification</A> </DIV>
<DIV><B>Subject:</B> Re: [Gasification] Wood Chip
classificaton</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV
style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none">
<DIV><FONT face=Arial>Dear Pete</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>An "ideal situation" would be if you had a constant flow
rate of air, which you then flowed through such chips screened to different
sizes. Then you could measure the pressure drop across a length of the bed. This
would tell you just how much pressure drop various sizes of chips would give
you. Then you could decide how small a chip size you could consider using.
</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>"Too small a chip" will likely give tar, unless the
gasifier is specifically designed to handle such fine chip sizes. However, this
is a lesser concern for gasifiers producing "Heating Grade Gas."</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Best wishes,</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Kevin</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"
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=spaco@baldwin-telecom.net
href="mailto:spaco@baldwin-telecom.net">Pete & Sheri</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=gasification@lists.bioenergylists.org
href="mailto:gasification@lists.bioenergylists.org">'Discussion of biomass
pyrolysis and gasification'</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, April 11, 2012 6:59
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Gasification] Wood Chip
classificaton</DIV>
<DIV> </DIV>
<DIV class=WordSection1>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">Hi,
Kevin.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">Thanks for the input. I
had better go out and check the sizes of my screens.
<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"> I realize that the APA
gauge is focused on thin chips for pulping. But you folks have been
telling me that I need thicker chips (in relation to the length and
height). I have actually been using a 3 screen system, with a smaller
screen (1/4 X ¼) to get the dust out before I even think of saving
anything. <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">But even with the 1X1 screen,
I could get chips that are only 1/32 thick, and therefore, very light in
weight.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">I am learning that those chips
may be okay in some circumstances, but I want to be able to see the difference
for myself.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">I still have a long way to
go.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">Pete
Stanaitis<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="COLOR: #1f497d">----------------<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p></o:p></SPAN> </P>
<DIV>
<DIV
style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">From:</SPAN></B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">
gasification-bounces@lists.bioenergylists.org
[mailto:gasification-bounces@lists.bioenergylists.org] <B>On Behalf Of
</B>Kevin<BR><B>Sent:</B> Wednesday, April 11, 2012 2:47 PM<BR><B>To:</B>
Discussion of biomass pyrolysis and gasification<BR><B>Subject:</B> Re:
[Gasification] Wood Chip classificaton<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p></o:p> </P>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 12pt">Dear
Pete</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"> <o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 12pt">I would suggest
that a simpler, and better way to evaluate wood chips is to use a "Two
Screen System." For example, if you used square mesh screen with 1/2"x1/2",
and 1"x1" openings, you would end up with 3 products:</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 12pt">1: +1"</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 12pt">2: -1", +
1/2"</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 12pt">3:
-1/2"</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"> <o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 12pt">The APA Gage is
intended for a different purpose... to give a reflection of wood fibre length,
because that is what is important to Pulp Mills. For gasifier applications,
uniformity of size, and the percentage of void space is what is important. The
"two screen system" should give screened chips from "between the screen decks"
that are much more uniform, and having much better gas flow
characteristics.</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"> <o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 12pt">Best
wishes,</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"> <o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 12pt">Kevin</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"> <o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"> <o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"> <o:p></o:p></SPAN></P></DIV>
<BLOCKQUOTE
style="BORDER-BOTTOM: medium none; BORDER-LEFT: black 1.5pt solid; PADDING-BOTTOM: 0in; MARGIN: 5pt 0in 5pt 3.75pt; PADDING-LEFT: 4pt; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">
<DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">----- Original
Message ----- <o:p></o:p></SPAN></P></DIV>
<DIV>
<P style="BACKGROUND: #e4e4e4" class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">From:</SPAN></B><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt"> <A
title=spaco@baldwin-telecom.net href="mailto:spaco@baldwin-telecom.net">Pete
& Sheri</A> <o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">To:</SPAN></B><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt"> <A
title=Gasification@bioenergylists.org
href="mailto:Gasification@bioenergylists.org">Gasification@bioenergylists.org</A>
<o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">Sent:</SPAN></B><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt"> Wednesday, April
11, 2012 3:37 PM<o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">Subject:</SPAN></B><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt"> [Gasification]
Wood Chip classificaton<o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></SPAN> </P></DIV>
<P class=MsoNormal>My only interest for gasifier fuel is wood chips.
If I cant understand them and make them work well, I wont be using a
gasifier at all.<o:p></o:p></P>
<P class=MsoNormal><o:p></o:p> </P>
<P class=MsoNormal>I know this may be old news to many of you, but I
recently found a couple of ways to characterize wood chips. Although
there are plenty of good systems out there the best ones are way to complex
and expensive for me. <o:p></o:p></P>
<P class=MsoNormal>So, I am using a simple gauge from the APA
(American Pulpwood Association.<o:p></o:p></P>
<P class=MsoNormal> My simple page to explain the process is
at:<o:p></o:p></P>
<P class=MsoNormal><o:p></o:p> </P>
<P class=MsoNormal><A
href="http://www.spaco.org/Woodgas/WoodChipMeasurement.htm">http://www.spaco.org/Woodgas/WoodChipMeasurement.htm</A><o:p></o:p></P>
<P class=MsoNormal><o:p></o:p> </P>
<P class=MsoNormal>It has links to a couple of in-depth sources for
understanding wood chips, too.<o:p></o:p></P>
<P class=MsoNormal><o:p></o:p> </P>
<P class=MsoNormal>Pete Stanaitis<o:p></o:p></P>
<P class=MsoNormal>----------------<o:p></o:p></P></BLOCKQUOTE></DIV>
<P>
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