Apparatus and methods for supplying auxiliary steam in a combined cycle system
- Ballston Spa, NY
- Ballston Lake, NY
To provide auxiliary steam, a low pressure valve is opened in a combined cycle system to divert low pressure steam from the heat recovery steam generator to a header for supplying steam to a second combined cycle's steam turbine seals, sparging devices and cooling steam for the steam turbine if the steam turbine and gas turbine lie on a common shaft with the generator. Cooling steam is supplied the gas turbine in the combined cycle system from the high pressure steam turbine. Spent gas turbine cooling steam may augment the low pressure steam supplied to the header by opening a high pressure valve whereby high and low pressure steam flows are combined. An attemperator is used to reduce the temperature of the combined steam in response to auxiliary steam flows above a predetermined flow and a steam header temperature above a predetermined temperature. The auxiliary steam may be used to start additional combined cycle units or to provide a host unit with steam turbine cooling and sealing steam during full-speed no-load operation after a load rejection.
- Research Organization:
- General Electric Co., Schenectady, NY (United States)
- DOE Contract Number:
- FC21-95MC31176
- Assignee:
- General Electric Company (Schenectady, NY)
- Patent Number(s):
- US 6422022
- OSTI ID:
- 874600
- Country of Publication:
- United States
- Language:
- English
Development Requirements for an Advanced Gas Turbine System
|
journal | October 1995 |
Advances in Steam Path Technology
|
journal | April 1996 |
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generator
header
cycles
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seals
sparging
devices
cooling
gas
lie
common
shaft
supplied
spent
augment
flows
attemperator
reduce
temperature
response
predetermined
flow
start
additional
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host
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load
rejection
gas turbine
steam generator
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