Re: Theory and terminology questions about combustion

["Paul S. Anderson" <psanders@ilstu.edu>]

Andrew,

Thanks for your informative reply.  (I did not see it before my previous 
message.)  YOU and a few others can get the highest scores.  People like me 
need the tutoring!!!

I will leave "zoomass" to others, but wonder if sewerage (and dung and 
feces) is "zoo- or phyto-"   (Not a topic for this list serve.)

Thanks for the clarification about producer gas and water gas.  Clearly the 
"very small gasifiers" such as mine do NOT yield producer gas.

Is it acceptable to use the term "wood-gas" if the phyto-mass is actually 
corn cobs or other clearly NON-wood material?   Is the gasification of 
straw (being discussed currently) producing "wood-gas"?   If we start 
speaking of phyto-gas (or "fito-gas" in many of the Romance languages), we 
should be clear that we include "wood-gas" and other 
"dry-vegetative-matter-gas".

:-))  No interest in the term "vegie-gas"?    I thought it was cute.

Thanks again.

Paul

At 12:10 AM 10/18/02 +0100, AJH wrote:
>On Tue, 15 Oct 2002 16:22:22 -0500, "Paul S. Anderson" <psand
> >
> >1.  Can regular biomass (I am not referring to the charcoal that is a stage
> >of biomass consumption) be consumed in fire ***without first undergoing the
> >release of the gases (pyrolysis and gasification)*** that are subsequently
> >combusted when mixed with oxygen and sufficient ignition?
>
>Possibly if burned as a fine powder the combustion would be so short
>that there would be no way of separating the reactions.
>
> >  In other words,
> >even in a regular "fire" of biomass, is it not true that the gases are
> >created first, even if the gases are almost immediately "burned"?  Hence,
> >there is no "fire" without gasification first.
>
>OK in general
>
> >
> >If yes to the above, then all stoves COULD be considered to be gasifiers,
> >and we therefore need to clarify that what we have been calling "gasifier
> >stoves" are ones in which ***the creation of the gases takes place in a
> >location at least slightly and control-ably removed in space and in time
> >from the point of the combustion of those gases***.
>
>I think this is the distinction that has been made in the past.
> >
> >2.  What are the real differences between "producer gas" and "wood-gas" and
>
>Producer gas is generally taken to be CO and Nitrogen formed by the
>gasification of carbon by air, water gas is H2 and CO formed by the
>gasification of carbon by steam. Woodgas is a mixture of these
>reactions and chemicals plus the pyrolysis (offgas) products of
>thermal decomposition, it contains many compounds ranging from weak
>organic acids, alcohols etc through to tars as vapours. Gasifiers
>making gas for other than thermal uses attempt to "crack" these
>pyrolysis compounds thermally to reduce them to simple gaseous
>compounds.
>
> >pyrolysis / gasification of any DRY plant-origin biomass.
>
>This is phytomass whether wet or dry.
>
> >  (We do not do
> >much gasification of dry animal-origin biomass.)
>
>This is zoomass and yes we do, there is much discussion on GAS-L of
>sewage sludge gasification. I suspect one of the most successful
>gasifiers operating is in a chrome leather works where the off cuts
>are recycled as heat and the chromium is recovered commercially from
>the ash.
>
> >
> >Paul S. Anderson, Ph.D.,  Fulbright Prof. to Mozambique
>
>How many marks out of ten do I score teach :-)?
>
>AJH
>
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>http://www.crest.org/articles/static/1/1011975672_7.html Carbon
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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


-
Stoves List Archives and Website:
http://www.crest.org/discussion/stoves/200209/
http://crest.org/discussiongroups/resources/stoves/
>
Stoves List Moderators:
Ron Larson, ronallarson@qwest.net
Elsen L. Karstad, elk@wananchi.com www.chardust.com

Other Biomass Stoves Events and Information:
http://www.crest.org/articles/static/1/1010424940_7.html Bioenergy
http://www.crest.org/articles/static/1/1011975339_7.html Gasification
http://www.crest.org/articles/static/1/1011975672_7.html Carbon

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