Method of operating a power station plant with steam cooling
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United States of America Patent
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May 25, 1999
Grant Date -
N/A
app pub date -
Feb 27, 1997
filing date -
Mar 14, 1996
priority date (Note) -
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Abstract
In a method of operating a power station plant, which essentially comprises a gas-turbine group, a waste-heat steam generator and a steam cycle, at least one portion of the steam (15, 29, 44) generated indirectly or directly in the waste-heat steam generator (14) is used for cooling thermally loaded structures of the gas-turbine group, this steam being at a varying preparation stage: the superheated steam (15) cools the structures (21, 25) on the high-pressure side, and the intermediate-pressure steam (29) and the flash steam (44) cool the structures (32, 36, 46) of the gas-turbine group which are on the low-pressure side. After cooling is effected, the respective cooling-steam quantity (22, 26; 33, 37) is directed into a working-air flow (3, 6; 8, 11) of the gas-turbine process.
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