[Gasification] Cellulose Gas and Biochar option

[GFWHELL at aol.com]

What percentage of  char production would be expected if the wood  was 
cooked in an oxygen free reactor?
Some of the liberated gasses could possibly be used to provide the  heat 
externally,  is it possible to "COKE" wood?
 
GFWHELL
 
 
 
 
In a message dated 2/10/2014 11:47:18 A.M. Eastern Standard Time,  
tmiles at trmiles.com writes:

Evan,

Studies that we have seen show that about 50% of the  char is derived from
lignin and about 25% each from cellulose and  hemicellulose. I'd have to dig
into the studies to qualify the conditions  of gasification and the species
involved but it is clear that each of the  fractions is carbonized with the
dominant char fraction being from the  lignin. 

Tom 

-----Original Message-----
From: Gasification  [mailto:gasification-bounces at lists.bioenergylists.org] 
On
Behalf Of Evan  Marks
Sent: Monday, February 10, 2014 5:09 AM
To:  gasification at lists.bioenergylists.org
Subject: Re: [Gasification] Cellulose  Gas and Biochar option

Tom M.

Rather, it would seem that perhaps  a study is needed! -EM





Tom,



While it is  easy to visualize the concept of lignin converting to char It
would be more  correct to say that a portion of the lignin decomposes during
gasification  and partial oxidation. Since lignin degrades starting at
200-300 C the  gaseous and vaporous products of this degradation are surely
carried off in  the gas that burns when exposed to the secondary air. You 
can
get less char  from grasses that have a higher lignin content (22%, bagasse)
than wood  (15% eucalyptus). The net char yield of charring either of these
in a TLUD  can be (24%)  greater than the intrinsic lignin content. Also in 
 a
TLUD air/gas flows are rarely uniform. Surely some of the char itself  is
oxidized by the primary air, generating heat to help drive the  
gasification.
I suspect that while lignin may be the principal precursor of  char, the 
char
is probably a blend of products of decomposition of lignin,  hemicellulose
and cellulose. I would think that someone has done a study of  the
decomposition of cellulose, hemicellulose and lignin in a TLUD.  



Tom Miles   

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