Method of controlling seal steam source in a combined steam and

Details Method of controlling seal steam source in a combined steam and Method of controlling seal steam source in a combined steam and

1992-09-11

1995-02-14

Lazarus, Ira S.

Power plants

Motive fluid energized by externally applied heat

Process of power production or system operation

60657, F01K 1302

Patent

active

053884116

ABSTRACT:
A method of operating a combined gas and steam turbine cycle system including a steam turbine provided with steam from at least one heat recovery steam generator having a high pressure section and a low pressure section, wherein the steam turbine includes high pressure seals and low pressure seals, includes the steps of:
a) when the steam turbine is operating at a load below a self-sealing load, supplying steam at a controlled, predetermined pressure to the high and low pressure seals from the high pressure section of the heat recovery steam generator; and
b) after steam from the lower pressure section of the heat recovery stem generator exceeds the predetermined pressure, supplying the high and low pressure seals with steam from the lower pressure section of the heat recovery steam generator at a pressure higher than the predetermined pressure, and
c) supplying steam from the high pressure section of the heat recovery steam generator whenever a turbine metal inlet temperature exceeds a predetermined reference temperature and turbine load is less than a predetermined reference load.

REFERENCES:
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patent: 4282708 (1981-08-01), Kuribayashi et al.
patent: 4437313 (1984-03-01), Taber et al.
patent: 4519207 (1985-05-01), Okabe et al.
patent: 4561254 (1985-12-01), Martens et al.
patent: 4589256 (1986-05-01), Akiba et al.
patent: 4793141 (1988-12-01), Yanai et al.
patent: 5029443 (1991-07-01), Hauser
patent: 5042246 (1991-08-01), Moore et al.
"GE Combined-Cycle Product Line and Performance", Chase et al., GE Power Generation, GE Turbine Reference Library.

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