Andrew,
Can we melt steel with torrified wood?
I'm trying to follow your thinking on the propane flame, inner/outer
business. Are your suggesting that the pyrolysis gasses be kept
separated from the CO from charcoal gasification in one device like the
Dasifier and then burn the latter inside the former.
The other Das trick to elevating the useful temperature is the intense
mixing he generates with his compressor induced flows, thereby
maximizing the heat flux in a small volume.
Is the necessary retention time for complete combustion inversely
proportional to the turbulent mixing rate of the fuel gas and air?
Alex
An 1 Further musings: [1] it should be just about possible to melt steel
with a wood flame if the wood is perfectly dry, in practice it doesn't
happen and iron was not produced until charcoal was used, the reason is
simple; whilst the charcoal only has <50% of the heat of the raw wood it
was produced from, it is dry nearly pure carbon with about 30MJ per kg
available to be released on full oxidation. C+O2+4N2=>4N2+ CO2+30MJ heat
per kg of C is a low massflow reaction and heats of over 2000C are
achievable. Consider a propane torch flame, when premixed with the
correct amount of air the flame is two blue flames, a bright blue inner
flame surrounded by a paler blue enveloping flame, the hottest part is
at the tip of the inner cone where nearly all of the premixed oxygen is
consumed burning hydrogen and some carbon to H2O and CO/CO2, remaining
CO is then burned in the outer enveloping flame by oxygen that has
survive the first flame and oxygen that diffuses in from the surrounding
air. Can we consider doing something similar with the dasifier, using
the high mass flow ~1600C pyrolysis offgas flame to form a hot envelope
around the lower heat capacity but higher temperature CO+N2 flame?
Without destroying the burner pipe from the heat? AJH
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