Re: Coal + hydrogen question
From: Dez Akin (dezakin_at_usa.net)
Date: 07/20/04
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Date: 20 Jul 2004 15:36:23 -0700
bri1600bv@hotmail.com (brianb) wrote in message news:<68a6629.0407191917.43a535c0@posting.google.com>...
> Would it be possible to instead of converting coal to oil, convert
> coal + hydrogen to oil? Would this allow the process to use more of
> the carbon in the coal?
Yes. William Mook proposes this as part of his business model over the
next decade. I'm not sure where he gets the capital to build the
fischer-tropsh reactors, but if he can provide the very cheap
hydrogen, maybe he can sell it to some big name synthetic fuel
company, or a company that does oil refining, as hydrogen is utilized
in the refining process.
For the easier way, if you're right next to a large natural gas
source, you can do partial reformation of the methane for synthesis
gas thats heavy on hydrogen, and then do partial oxidation of the coal
for CO to mix in. After you have Mook's inexpensive hydrogen you can
discard the natural gas source and the coal/water shift reaction and
make maximum use of your carbon source. Hopefully William will
deliver.
> How much energy would this take to add the heat and whatnot?
>
> I think about 100kgs of hydrogen and 1000kgs of coal (which is 6%
> hydrogen) would do it.
>
> Would it be cheaper to use sequestered carbon dioxide? Or would
> splitting the carbon from the oxygen require too much work?
It would require much more energy certainly. You would have to have
fiat mandate from the government to persuede industry to pursue this
option while the inexpensive coal lies around everywhere.
> Does anyone know? Is this even possible? I would think so, it would
> also allow liquid fuels to be made from renewable energy (wind for
> example) rather than just hydrogen. Right now wind is limited on the
> grid due to intermittency.
Add more dams or pumped storage and you can rev up wind all you
want... as long as you can get wind itself competitive, which I have
some reservations about.
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