[Stoves] Particles and particle types (was Charcoal MakingStove)

[Paul S. Anderson]

Quoting Tom Miles <tmiles at trmiles.com>:

> The biggest influence on temperature is likely to be fuel moisture. That's
> going to determine your peak flame temperature and heat load in combustion.
> Moisture in wood also regulates the rate of combustion as it diffuses to the
> wood surface and evaporates.

Tom M and Tom R and all,

In a T-LUD, the lower (gasifier) section must fight the moisture content
(MC)issue, with need for more air and more char consumption to sustain the
pyrolysis process.  The moisture present (up to MC 30%) is turned into vapor,
that is, all of the latent heat for evaporation is provided down in the
gasifier.

But when the pyrolysis gases plus the water vapor rise up to the combustion
zone, no more latent heat is needed.  Therefore, will the combustion of the
gases from high MC wood (30%) yield temperatures about the same as the gases
from moderate (20%) or low (10%) MC wood?

(I acknowledge that some heat is needed to take the water vapor molecules from
initial temperature (perhaps 500 deg C after pyrolysis) up to the temperature
of the final flame at perhaps 900 to 1100 deg C).

The question:  In regard to higher moisture content in the fuel, is there any
advantage in the FINAL flame temperature attained when using a T-LUD versus
using the traditional combustion devices?  In theory, yes or maybe or no.  But
in practice, I doubt if it has ever been tested.

Paul
-- 
Paul S. Anderson, Ph.D., Geography professor - Emeritus
Telephone:  USA-309-452-7072 (residence and office)
Internet site:  www.ilstu.edu/~psanders
For my gasifier stoves info, go to:
http://bioenergylists.org/contributors#Paul_Anderson






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