[Gasification] Design Parameters based on Superficial Velocity

[Steve Carroll]

 Thanks for those replies.  So I guess that at least
with a fuel like wood that it would pyrolysize in any
number of environments, each giving off a different
mixture of products.  So I could pyrolysize wood in a
vacuum, in air, in CO2, or whatever else I wanted to. 
Interesting information, probably even more
interesting to someone with a chemistry background. 
There is a company in my town that holds a patent for
a gasifier whose end product is acetylene.  I don't
remember if they added the additional material in the
pyrolysis stage or in the gasification stage.

> There are indications that once started, pyrolysis
> is autothermic for 
> *bone dry wood*.  I have set up very well insulated
> systems to test 
> this, but haven't accomplished it yet.  However, the
> energy required for 
> pyrolytic gasification of Denver dry (8% moisture)
> wood is probably < 5% 
> of the heat of combustion (21 MJ/kg; 8500 Btu/lb). 
> 
> But of course BDW doesn't occur in nature.  We are
> planning to measure 
> the minimum air required for flaming pyrolysis as a
> function of moisture 
> content, but don't hole your breath....

Autothermic pyrolysis?  I haven't found a good
definition for that term yet but it sounds impossible.
 Maybe someone would enlighten me.

My original question in context:

--snip-- 
  Volume of primary air:  Kind of a side question here
but; does the volume of air control how much fuel can
be pyrolysized or can pyrolysis take place in a
complete vacuum?  Same question for gasification.
/--snip

The gist of the question was about how much control
can I excersize over the entire process just by
modulating the flow of primary air.  I would imagine
that the range would be limited by your throat size
due to the change in SV.  Has anyone designed anything
with a modulating throat?

BTW Tom, how did you change the velocity in that TLUD
sv test?

Holding My Breath,
Steve



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