Mark, Forget it! When you drag on a gasifier you are working on a
temperature of 800-900 degreesC. When gas gets hot it expands, and the
velocity goes up and the pressure goes down, not up!. Have you ever measured
the pressure through the throat of a gasifier? Furthermore, it means that
to compress it you first have to cool it down. And even on a stationary
setup you need an awful lot of cooling water, plus a heat exchanger if you
don't want to get had up for polluting the local water supply. If its to
be aircooled then you have to blow an awful lot of air which either sucks
out the horsepower that you might have though thatyou have available, or
worse still, it takes up electricity that you would use even more gas to
generate. You burn up a lot of energy to cool the gas before you even start
to compress, and then after even one stage of compression the gas is hot
again, so that like the intercooler on a turbo, you need to cool it again,
and again.. So any thought of calculating a compressibility factor starts
needing a redhot computer. If you are prepared to gasifiy with oxygen and
get synthesis gas you might come out of the exercise about even, but to do
it with 50% nitrogen outof a downdraft gasifier means thatyou are pouring
far more energy into the system than you will ever get out. "Madness."
Two cents worth from a 73 year old who has thought it and tried it and
come back a lot older and a lot wiser! Ken C.
----- Original Message -----
From: "Mark Anderson" <[email protected]>
To: <[email protected]>
Sent: Monday, August 23, 2010 7:46 AM
Subject: [Gasification] Compressibility Factor
Hey
Does anyone know or can they work out a compressibility factor ( Z factor)
for a typical producer gas from a down draft biomass system?
Mark
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