GAS-L: Gasifier terminology clarification

["Tom Reed" <tombreed@attbi.com>]

Dear Paul and aul:

Concerning the choice of "pyrolyser" of "gasifier" or "pyrolytic gasifier":

There are many kinds of gasifiers (>20,000 by my recent note).  ALL
gasifiers (and combustors) by necessity include a pyrolytic stage as they go
through the heating from 20-500C which releases volatiles and sometimes
partially oxidized (to CH4, CO and H2) pyrolytic gases (in flaming
pyrolysis).  Other gasifiers then (at higher temperatures) gasify the
charcoal for a higher production of gas, less charcoal.

So if we stop at the end of the flaming pyrolysis, Wendelbroe chooses to
call it a pyrolyser. We are talking about the same reality.  These fine
points are more than the average user can absorb, so  I choose to call it a
gasifier.

Only heavy duty steam reforming or oxidation can get rid of all tars, so all
gasifiers produce some char, some tar and some gas.  Just a difference of
proportions.  I suspect that the tars in our "inverted downdraft gasifiers"
might be as high as 1% and I hope to measure them soon.

~~~~~
Sounds like Wendelbroe and company have lost interest, since I haven't heard
since.  Please see if you can find Per S. Nielson at Danish Technical
University and send him an Email.  I'm curious too.

Onward,          TOM REED


----- Original Message -----
From: "Paul S. Anderson" <psanders@ilstu.edu>
To: <stoves@crest.org>
Sent: Monday, October 28, 2002 2:45 PM
Subject: Fwd: Re: History of small gasifiers. Re: straw briquettes


> Tom Reed sent this great attachment about this 1996 gasifier.
>
> >Dear Paul:
> >
> >On my "World Odyssey Trip" in 1996 I heard the Wendelbro stove discussed
at
> >the Danish Technical University and tracked it down.  Attached is a
> >description.  They call it a pyrolysis stove - I call it a gasifier
stove,
> >but some deal as far as I can see.
> Tom, Can you say why you call it a gasifier, when in fact it seems to
> depend on pyrolysis?
>
> Also, is there any background about when he actually got started building
> it.  You began in 1985 and published in 1995, but no indication in the
> bibliography of the attachment about how this Wendelbro got started.
>
> >Have they lost interest?
> >
> >TOM
> >
> >
> >----- Original Message -----
> >From: "Paul S. Anderson" <psanders@ilstu.edu>
> >To: <english@kingston.net>; <stoves@crest.org>
> >Sent: Monday, October 28, 2002 9:06 AM
> >Subject: Re: History of small gasifiers. Re: straw briquettes
> >
> > > Stovers,
> > >
> > > Alex sent this informative message.  I wonder if anyone can carry this
> >lead
> > > any further, such as to contact Per S. Nielsen.
> > >
>


----------------------------------------------------------------------------
----


> Paul S. Anderson, Ph.D.,  Fulbright Prof. to Mozambique 8/99 - 7/00
> Rotary University Teacher Grantee to Mozambique >10 mo of 2001-2003
> Dept of Geography - Geology (Box 4400), Illinois State University
> Normal, IL  61790-4400   Voice:  309-438-7360;  FAX:  309-438-5310
> E-mail: psanders@ilstu.edu - Internet items: www.ilstu.edu/~psanders
>


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