Method of operating a combined-cycle power plant

Details Method of operating a combined-cycle power plant Method of operating a combined-cycle power plant

1998-09-18

2000-11-07

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

60 39182, F02C 618

Patent

active

061419524

ABSTRACT:
In a method of operating a combined-cycle plant, valves (21) acting upstream of a high-pressure steam turbine (12) are completely closed in the event of load shedding. The gas-turbine group (A+8) is uncoupled from an intermediate-pressure/low-pressure steam turbine (11) in such a way that the gas-turbine group can go into island mode. In this case, the speed of the uncoupled steam turbine (11) is not greater than the speed of the gas-turbine group (A+8), and steam (16) in the flow path of a reheater (10a) belonging to the heat-recovery steam generator (10) expands freely through the intermediate-pressure/low-pressure steam turbine (11), in the course of which this expansion does not cause the speed of the gas-turbine group (A+8) to exceed its protective speed.

REFERENCES:
patent: 3879616 (1975-04-01), Baker et al.
patent: 4519207 (1985-05-01), Okabe et al.
patent: 5099643 (1992-03-01), Moore
patent: 5301499 (1994-04-01), Jensen et al.

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