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Stoves Archive for May 2002
102 messages, last added Tue Nov 26 17:31:37 2002
[Date Index][Thread Index]

No Subject

Generalizations are dangerous=20

a) if there is a wide spread away from the center

b) if you don't generalize and get hung up on unimportant details. =20

c) including this one.=20

Hope this is useful.

TOM REED                 BEF STOVEWORKS              BEF GASWORKS

 =20
  ----- Original Message -----=20
  From: Crispin=20
  To: Stoves=20
  Sent: Saturday, May 25, 2002 2:53 AM
  Subject: Carbon content


  Dear Dean

  I did find the following analyses done by Gottlieb:

                  C               H             N              O         =
   Ash      Calories      B.t.u.
  Oak      50.16        6.02        0.09        43.36         0.37       =
 4620        8316
  Ash      49.18        6.27        0.07        43.91         0.57       =
 4711        8480
  Elm      48.99        6.20        0.06        44.25         0.50       =
 4728        8510
  Beech  49.06        6.11        0.09        44.17         0.57        =
4774        8591
  Birch    48.88        6.06        0.10        44.67         0.29       =
 4771        8586
  Fir        50.36        5.92        0.05        43.39         0.28     =
   5035        9063
  Pine     50.31        6.20        0.04        43.08         0.37       =
 5085        9153

  Regards
  Crispin

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<DIV><FONT face=3DArial size=3D2>Dear Crispin, Dean and =
All:&nbsp;&nbsp;&nbsp;=20
&nbsp;&nbsp;&nbsp; </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>I hope you all noticed that the carbon =
content of=20
the woods listed by Crispin (below) only varies by a few percent.&nbsp; =
This is=20
part of Mother Nature's Biomass Scheme in which She uses a mix of =
cellulose,=20
hemicellulose and lignin in approximately 2/1/1 ratio for most of her =
structural=20
work.&nbsp; (Check my website <A=20
href=3D"http://www.woodgas./proximat.com";>www.woodgas./proximat.com</A> =
and be=20
amazed at how similar the ultimate analysis is for most of the natural =
biomass=20
forms shown.)</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Note also here that the bone dry energy =
content=20
hovers close to 21 MJ/kg for most biomass species.&nbsp; So the Mass =
Energy=20
Density is not usually an important variable.&nbsp; I wish the table =
also listed=20
real and buld density, but that would be difficult in many cases since =
it=20
depsnds on packing, growth time (spring wood vs fall wood etc.) and many =
other=20
things.&nbsp; So the Volume Energy Density&nbsp;needs to =
be&nbsp;determined for=20
each load of biomass and can vary immensely.&nbsp; &nbsp;</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>From a practical viewpoint the real and =
bulk Volume=20
energy density and Mass energy density &nbsp;is MUCH more important in=20
evaluating fuel value, handling difficulties, combustion properties=20
etc....&nbsp; For combustion (T &gt;1200 C) the ash content and =
properties can=20
be all important, less&nbsp;so for gasification (T &lt; 1000 C), even =
less so=20
for pyrolysis (T&lt; 700 C).&nbsp;&nbsp;</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Generalizations are =
dangerous&nbsp;</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>a) if there is a wide spread away from =
the=20
center</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>b) if you don't generalize and =
get&nbsp;hung up on=20
unimportant details.&nbsp;&nbsp;</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>c) including this one. </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Hope this is useful.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>TOM=20
REED&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;=20
BEF=20
STOVEWORKS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;=20
BEF GASWORKS</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp; </FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3Dcrispin@newdawn.sz =
href=3D"mailto:crispin@newdawn.sz";>Crispin</A>=20
</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A title=3Dstoves@crest.org =

  href=3D"mailto:stoves@crest.org";>Stoves</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, May 25, 2002 =
2:53=20
AM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Carbon content</DIV>
  <DIV><FONT face=3DArial size=3D2></FONT><FONT face=3DArial =
size=3D2></FONT><FONT=20
  face=3DArial size=3D2></FONT><BR></DIV>
  <DIV><FONT face=3DArial size=3D3>Dear Dean</FONT></DIV>
  <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D3>I did find the following analyses =
done by=20
  Gottlieb:</FONT></DIV>
  <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D3>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; =

  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; C&nbsp;&nbsp;&nbsp;=20
  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  H&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  N&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  O&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  Ash&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
Calories&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  B.t.u.</FONT></DIV>
  <DIV><FONT face=3DArial size=3D3>Oak&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  50.16&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; 6.02&nbsp;&nbsp;&nbsp;=20
  &nbsp;&nbsp;&nbsp; 0.09&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;=20
  =
43.36&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.37&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4620&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;8316</FONT></DIV>
  <DIV><FONT face=3DArial size=3D3>Ash&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  49.18&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; 6.27&nbsp;&nbsp;&nbsp;=20
  &nbsp;&nbsp;&nbsp; 0.07&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;=20
  43.91&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp; =
0.57&nbsp;&nbsp;&nbsp;=20
  &nbsp;&nbsp;&nbsp; 4711&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; =
8480</FONT></DIV>
  <DIV><FONT face=3DArial size=3D3>Elm&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  48.99&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  6.20&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.06&nbsp;&nbsp;&nbsp;=20
  &nbsp;&nbsp;&nbsp; =
44.25&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  0.50&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; 4728&nbsp;&nbsp;&nbsp;=20
  &nbsp;&nbsp;&nbsp; 8510</FONT></DIV>
  <DIV><FONT face=3DArial=20
  =
size=3D3>Beech&nbsp;&nbsp;49.06&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
=20
  6.11&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; 0.09&nbsp;&nbsp;&nbsp;=20
  &nbsp;&nbsp;&nbsp; 44.17&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;=20
  0.57&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; 4774&nbsp;&nbsp;&nbsp;=20
  &nbsp;&nbsp;&nbsp; 8591</FONT></DIV>
  <DIV><FONT face=3DArial size=3D3>Birch&nbsp;&nbsp;&nbsp;=20
  48.88&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 6.06&nbsp;&nbsp;&nbsp; =

  &nbsp;&nbsp;&nbsp; 0.10&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;=20
  44.67&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
0.29&nbsp;&nbsp;&nbsp;=20
  &nbsp;&nbsp;&nbsp; 4771&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; =
8586</FONT></DIV>
  <DIV><FONT face=3DArial size=3D3>Fir&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;=20
  50.36&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5.92&nbsp;&nbsp;&nbsp; =

  &nbsp;&nbsp;&nbsp; 0.05&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;=20
  43.39&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp; =
0.28&nbsp;&nbsp;&nbsp;=20
  &nbsp;&nbsp;&nbsp; 5035&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; =
9063</FONT></DIV>
  <DIV><FONT face=3DArial size=3D3>Pine &nbsp;&nbsp;&nbsp;=20
  =
50.31&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.20&nbsp;&nbsp;&nbs=
p;=20
  &nbsp;&nbsp;&nbsp; 0.04&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;=20
  43.08&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp; =
0.37&nbsp;&nbsp;&nbsp;=20
  &nbsp;&nbsp;&nbsp; 5085&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; =
9153</FONT></DIV>
  <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D3>Regards</FONT></DIV>
  <DIV><FONT =
face=3DArial>Crispin</FONT></DIV></BLOCKQUOTE></BODY></HTML>

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