GF,
There may be a couple of other ways that we could include in the list of
"possibles".
The first is a variation of the VSA and PSA you mention in your post. That
would be a poly "sieve" or filter. By pressuring one side, but having
flow, the air that passes through is the smaller molecule. The air on the
inlet side would concentrate and a butterfly valve discharge the wanted (or
unwanted) gas. It would seem one could do it in a through feed process,
especially for a pressurized gasification system. A backflow may be necessary
to clean a filter, like on some dust collectors.
The second and interesting to me is the combination of wind power and
gasification. Making hydrogen gas by electrolysis, made by wind, also makes
oxygen. Lots of wind would be making lots of H and O, so about any use would
be correlated to the wind...if not stored. While it's giving some quantity ??
of oxygen and hydrogen, it may not be as much as may be needed for any larger
gasifier. Could one pressurize and store both of them (H & O) to smooth out a
system, in high pressure tanks, or does that eat any energy gained? Of course
if one is turning an engine by the gas, combined with producer gas, a
mechanically connected piston pump could be energy efficient.
With a PSA / VSA or classification filter system, while it gets more complex,
it may be a good CHP combination, as a strategy for reduction of nitrogen in a
gasification system. I can especially see it for a liquid FT process, since
the proportions of gases closely match the requirements to make liquid
fuels (the goal in my "prosyn" reactor).
High energy content gas must have reduced significantly or eliminated the
nitrogen in incoming air, I believe.
Best regards,
Toby Seiler
Seilertechco
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