Re: New Coal Power Plants

peterwezeman@xxxxxxxxxxx wrote:

I heard on the radio that utilities building new coal fired plants
generally prefer conventional steam plants rather than the newer design
where the coal is gasified and then burned in a gas turbine with steam
bottoming cycle. I find this somewhat surprising as the gasification
plants have a thermal efficiency of 45 percent versus 30-35 percent for
steam plants, and gasification plants have been operating successfully
in this country for over a decade. Are the costs of a gasification
system so great as to offset the increase in efficiency?

I'm not sure there *is* any increase in efficiency. At
http://pepei.pennnet.com/Articles/Article_Display.cfm?Section=Archives&Subsection=Display&ARTICLE_ID=152601
are efficiency data for some power plants
that were going into service in 2000;
percentage efficiencies were over 40.


--- Graham Cowan, former hydrogen fan
Boron: fire with nuclear cachet http://tinyurl.com/4xt8g
.

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