Dear Bruce
----- Original Message -----
From: "Bruce Jackson" <[email protected]>
To: "Discussion of biomass pyrolysis and gasification"
<[email protected]>
Sent: Wednesday, December 15, 2010 10:36 PM
Subject: [Gasification] heat transfer properties....
Before I forget this yet again...
Is it possible that the zone that produces heat, needs a catalyst like iron?
# I don't think so. CO and H2 as pure gases burn, and there is radiated heat
from them.
My uninformed opinon (without reviewing my heat transfer tomes) would be
that
the gas is invisible to the infrared component.
# I recall from calculation of radiant heat from flames that three factors
are important:
1: Flame luminosity, as caused by glowing particles
2: The presence of CO2
3: The presence of H2O
# These three factors all contribute to the radiation capability of the
flame. Moist air, steam and CO2 could pick up heat by radiation.
I suspect the gas is only
picking up heat from conduction. I don't know the percentages of which
components are domainant (thats the home work part), but if the IR component
is
significant, then its being lost on the gas. This especially if the ash is
what
the gas impinges on.
# The dominant factor in radiation form flames is the presence of glowing
carbon particles. As I recall, CO2 and H2O have approximately equal
radiation coefficients.
This idea occurs to me from watching the fires. I can hold my hand in the
flames but I can't hold it near the coals because I am picking up too much
IR.
# Something wrong here!! Flames are releasing teh heat of combustion, and a
burn is guaranteed, unless you mofe your hand through the flame quickly. If
you passed your hand over glowing coals equally quickly, you would not get a
burn.
Best wishes,
Kevin
BPJ
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