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<DIV>What percentage of char production would be expected if the wood
was cooked in an oxygen free reactor?</DIV>
<DIV>Some of the liberated gasses could possibly be used to provide the
heat externally, is it possible to "COKE" wood?</DIV>
<DIV> </DIV>
<DIV>GFWHELL</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 2/10/2014 11:47:18 A.M. Eastern Standard Time,
tmiles@trmiles.com writes:</DIV>
<BLOCKQUOTE
style="BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><FONT
style="BACKGROUND-COLOR: transparent" color=#000000 size=2
face=Arial>Evan,<BR><BR>Studies that we have seen show that about 50% of the
char is derived from<BR>lignin and about 25% each from cellulose and
hemicellulose. I'd have to dig<BR>into the studies to qualify the conditions
of gasification and the species<BR>involved but it is clear that each of the
fractions is carbonized with the<BR>dominant char fraction being from the
lignin. <BR><BR>Tom <BR><BR>-----Original Message-----<BR>From: Gasification
[mailto:gasification-bounces@lists.bioenergylists.org] On<BR>Behalf Of Evan
Marks<BR>Sent: Monday, February 10, 2014 5:09 AM<BR>To:
gasification@lists.bioenergylists.org<BR>Subject: Re: [Gasification] Cellulose
Gas and Biochar option<BR><BR>Tom M.<BR><BR>Rather, it would seem that perhaps
a study is needed! -EM<BR><BR><BR><BR><BR><BR>Tom,<BR><BR><BR><BR>While it is
easy to visualize the concept of lignin converting to char It<BR>would be more
correct to say that a portion of the lignin decomposes during<BR>gasification
and partial oxidation. Since lignin degrades starting at<BR>200-300 C the
gaseous and vaporous products of this degradation are surely<BR>carried off in
the gas that burns when exposed to the secondary air. You can<BR>get less char
from grasses that have a higher lignin content (22%, bagasse)<BR>than wood
(15% eucalyptus). The net char yield of charring either of these<BR>in a TLUD
can be (24%) greater than the intrinsic lignin content. Also in
a<BR>TLUD air/gas flows are rarely uniform. Surely some of the char itself
is<BR>oxidized by the primary air, generating heat to help drive the
gasification.<BR>I suspect that while lignin may be the principal precursor of
char, the char<BR>is probably a blend of products of decomposition of lignin,
hemicellulose<BR>and cellulose. I would think that someone has done a study of
the<BR>decomposition of cellulose, hemicellulose and lignin in a TLUD.
<BR><BR><BR><BR>Tom Miles
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