[Gasification] Fwd: Gasification of torrefied biomass

[Mike Weaver]

Dear Greg,

Please note this was forwarded to the Gasification list at its new
home: gasification at bioenergylists.org.  Please be sure you are using
the new list address.

Thank you,

Mike Weaver



---------- Forwarded message ----------
From: Greg Manning <a31ford at gmail.com>
Date: Sat, Oct 2, 2010 at 11:08 AM
Subject: Re: [Gasification] Gasification of torrefied biomass
To: Discussion of biomass pyrolysis and gasification
<gasification at listserv.repp.org>

 Greetings Billy, and list members.

 In most designs of "homemade" downdraft gasifiers, IMO the feedstock can
only push moisture content to the area of about 15%, however, if an "air
dryer" is used in the tuyere air, 18% is attainable.

 Why I say the above, is that on the opposite side of things, having too
little moisture will cause an excess clinkering due to the gasifier running
"too hot".

 In your case a simple water injector system could be used to temper the
overall reaction temperature, AND it kept at the high-end of reaction, could
also employ the water/gas shift just above the reduction zone. this would
have to be carefully managed, but could be done.

 Most gasifiers suffer from a massive excess's of moisture, my personal
observations are that 4-9% is ideal for most feedstocks total moisture (air
and feedstock combined).

 hope this helps.

Greg Manning,
Canadian Gasifier Ltd.
Building Hi-Performance Gasifiers, Since 2001

Brandon, Manitoba, Canada
1 (204) 726-1851