Patent US3884036A successfully refreshed from Google Patents.
US3884036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam plant with pressure-fired boiler
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1973-11-27
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Granted: 1975-05-20
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Expires: 1993-11-27
Abstract
Abstract A steam power plant providing steam to drive a steam turbine coupled to an electrical generator includes a pressure-fired boiler the fuel flow rate of which is controlled by a livesteam regulator and a pressure-charging set consisting of turbocompressor for providing combustion air and which is driven by a gas turbine powered by the exhaust gas from the boiler and a starter motor, all on the same shaft. The speed of the pressurecharging set is regulated by varying the throughput of the gas turbine and/or the temperature of the gas turbine inlet in such manner that it neither produces surplus power nor requires power from the outside in accordance with variations in the steam power demand from the boiler as the load on the steam turbine changes. The starter motor for the pressure charging set is disconnected after starting and, at full load on the plant, the charging pressure for the combustion air is at least 9 bar, and the exhaust gas at the gas turbine outlet is no higher than 165*.
Inventors
- 👤 Hans Pfenninger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:47
CPC Classifications
F; F01; F01K; F01K13/00; F01K13/02; F01K23/00; F01K23/02; F01K23/06; F01K23/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
269 words
A combined steam and gas turbine plant comprising a pressurefired boiler providing steam for driving a steam turbine coupled to a power consumer such as an electrical generator, means including a condenser at the discharge side of said steam turbine for converting the discharged steam into feed water and a return line for the feed water to the inlet side of said boiler for recycling, a heat exchanger for pre-heating the returned feed water by heat exchange with combustion gas at the gas discharge side of said boiler, a by-pass for the combustion gas passing through said heat exchanger, valve means for controlling said by-pass, the respective portions of the combustion gas put through said by-pass and through said heat exchanger being combined at the outlet thereof and delivered to the inlet of a gas turbine at a temperature variable in accordance with the portion of the gas put through said by-pass and constituting the sole motive fluid for driving said gas turbine, a live-steam regulator responsive to a change in load on the power plant for correspondingly regulating the fuel supply to said boiler and for regulating said valve means which controls the by-pass to said feed water heat exchanger thereby to increase or decrease, respectively the temperature of the discharged combustion gas and thereby increase or decrease, respectively the speed of the gas turbine and air compressor coupled thereto in dependence upon the sense of the change in load on the power plant so as to maintain a match between the required power input to said gas turbine and the required pressurized air output from said compressor.
Claim 2
Dependent Claim
269 words
A combined steam and gas turbine plant comprising a pressurefired boiler providing steam for driving a steam turbine coupled to a power consumer such as an electrical generator, means including a condenser at the discharge side of said steam turbine for converting the discharged steam into feed water and a return line for the feed water to the inlet side of said boiler for recycling, a heat exchanger for pre-heating the returned feed water by heat exchange with combustion gas at the gas discharge side of said boiler, a by-pass for the combustion gas passing through said heat exchanger, valve means for controlling said by-pass, the respective portions of the combustion gas put through said by-pass and through said heat exchanger being combined at the outlet thereof and delivered to the inlet of a gas turbine at a temperature variable in accordance with the portion of the gas put through said by-pass and constituting the sole motive fluid for driving said gas turbine, a live-steam regulator responsive to a change in load on the power plant for correspondingly regulating the fuel supply to said boiler and for regulating said valve means which controls the by-pass to said feed water heat exchanger thereby to increase or decrease, respectively the temperature of the discharged combustion gas and thereby increase or decrease, respectively the speed of the gas turbine and air compressor coupled thereto in dependence upon the sense of the change in load on the power plant so as to maintain a match between the required power input to said gas turbine and the required pressurized air output from said compressor.
Claim 3
Dependent Claim
210 words
A power plant as defined in claim 1 and which further includes an additional by-pass provided between the inlet and outlet sides of said gas turbine, and valve means for controlling said additional by-pass and which are likewise regulated by said live-steam regulator in such sense as to move said valve means to a more closed or open position respectively in response to an increase or decrease respectively in load on the power plant, said valve means for controlling the amount of combustion gas put through the by-pass for the heat exchanger being moved to a more open position followed by a movement of said valve means for controlling the amount of combustion gas by-passed between the inlet and outlet sides of said gas turbine to a more closed position in the event of an increase in load on the power plant, and said valve means for controlling the amount of combustion gas put through the by-pass for the heat exchanger being moved to a more closed position followed by movement of said valve means for controlling the amount of combustion gas by-passed between the inlet and outlet sides of said gas turbine to a more open position in the event of a decrease in load on the power plant.
Claim 4
Dependent Claim
31 words
A power plant as defined in claim 2 wherein both of said valve means for controlling said by-passes are closed when said power plant is operating at its full load rating.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |