Re: Theory and terminology questions about combustion

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

Stovers,

Andrew has been very helpful, and this comment is to re-state a fact that 
will be very important in a future message I am preparing.

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.
PSA:  I used the word "regular", and Andrew points out "possibly" one 
exception (a fine powder) which I will say is therefore not "regular biomass."

> >  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

Summary:  Except for exceptional cases that might be theoretical or 
artificially generated (that is, NOT regular biomass burning), "regular 
biomass can only be consumed in fire when first it undergoes the release of 
the gases (pyrolysis and gasification) that are subsequently combusted when 
mixed with oxygen and sufficient ignition."
(If not ignited, then there is "smoke" and released gases into the air).

Paul
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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