[Gasification] Why dry gasification fuel?

[Greg Manning]

  Hi Steve, and List.

 Steve, you bring some valid points to the table.

item 2 can be somewhat  Eliminated, from the standpoint of, if the heat
value is enough for the reduction reaction to take place, 2 does not apply,
except as a possible gain from the water gas reaction that would happen
along with our reduction (a bonus in this case).

SO lets focus on Item 1.

Woods sensible heat value under ideal conditions if memory serves correct,
is 7200btu/lb. (Bone dry basis) note that this is "per pound", oak is denser
than balsa, therefore more pounds per limb or trunk, and more btu's per
tree, etc.

Water content and the requirement to bring it to a vapor from a liquid,
requires X amount of those btu's therefore "robbing" that heat from our heat
needed for thermal gasification.

 One can supplement the required heat at the throat section, by the addition
of electric heating coils wrapped around the throat, or some other form of
external heat source (external being not from our feedstock, but internally
mounted within the gasifier vessel). This is the dilemma, In a system where
we want to maximize the advantage of not requiring external energy to do the
job.

I'll say this, Steve, if you know of a method that I can attempt with one of
the 5 gasifiers I have here, I would love to know about it, 4 of the
gasifiers are test beds, (2 table top units under 10KwT , 2 mid sized units
under 50KwT, and one stationary 300KwT unit (non test bed)).

Of the four testers, they are expendable, and are disassemble-able and can
be modified at wimp. The Large stationary unit is hands off.

Do tell......

Greg Manning



-----Original Message-----
From: gasification-bounces at listserv.repp.org
[mailto:gasification-bounces at listserv.repp.org]On Behalf Of Steve Redmond
Sent: Friday, December 15, 2006 5:41 PM
To: gasification at listserv.repp.org
Subject: [Gasification] Why dry gasification fuel?


I understand about the reaction process in gassification, but then that is
the area you believe wouldn't be hot enough, rather than the pyrolisis
itself.

Rather than getting into the specifics of an existing reactor architecture,
lets back up a little.

It seems to me that the objection (whether it applies in all cases or not)
to producing gas with green wood is:

1.) Temperatures in the reactor would be too low, and
2.) That heat in the steam is too high.

So how would we solve that?


_______________________________________________
Gasification mailing list
Gasification at listserv.repp.org
http://listserv.repp.org/mailman/listinfo/gasification_listserv.repp.org
http://gasifiers.bioenergylists.org

--
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.1.409 / Virus Database: 268.15.20/588 - Release Date: 12/15/2006

--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.409 / Virus Database: 268.15.20/588 - Release Date: 12/15/2006