[Gasification] Why dry gassification fuel?

[Greg Manning]

 Hi Steve, (and list members)

 Steve, first off, do you subscribe to the list ? as in receive the posts
directly ? I do, and because I sent to both you and the list I'm getting 2
copies of each (NOT that this is a problem, it's my own fault), I guess what
I'm saying is... will you see my replies if I only send to the list ?

 Anyhow, the critical temperature range of 700 to 900 c needed to thermally
un-bind the woods structures into H2, Ch4, Co, Co2, and dilution with N2
(from the air) appears only attainable with dryer chips (when NOT using an
external heating source). I'm speaking of air operated, burn a portion of
your gasifiers feedstock to obtain the heat required to gasify, type
configuration.

Dryer chips, being under 14%MC (combined free and cellular water) at the
tuyere line and below, when speaking downdraft...

 Excess water, robs the critical internal heat from the system, as well as
being entrained moisture within the producer gas output, that still requires
being "stripped out" before the engine (rust formation in the engine).

Therefore, even though with some extra water , the gasifier will run
correctly, the engine will not...

Upstream moisture removal is simpler as well as preheating the feedstock.

My air entrained, wire mesh cased auger, does this job very well, as so does
the basic monorator upper hopper, on the gasifier (Still have to update that
on my website).

The Final auger that fills the top hopper on the gasifier, is actually an
8", but the auger that feeds this one from the outside bin, is only a 6"
therefore the 8" always runs partially empty and recirculates the chips many
times while moving them upward (both augers are running at the same speed,
from the same shaft...) The 6" is a normal "grain auger" with standard outer
casing, but the 8" has a casing of expanded wire mesh of the 3/16" variety
(non-swedged), it (the 8") actually does about 3 jobs... A) Polish the chips
in the final stage, bringing the final MC to the 14% mark. B) preheats the
chips. C) Removes any final "fines" from the chip content.

Around the 8" is a larger 12" casing that the preheat air moves through.

These augers actually move slowly, in the range of 12- 45 Revolutions per
HOUR, continually "topping up" the upper hopper on the gasifier.

All of this will be added to my website in the next little bit, as we
finally shutdown for winter today (heavy construction), so I'll be home now
for the next couple of months or so..

Greg





-----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 2:43 PM
To: gasification at listserv.repp.org
Subject: [Gasification] Why dry gassification fuel?


Why not do the conversion directly from green?




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