Exhaust heat augmentation in a combined cycle power plant
First Claim
1. A combined cycle power plant comprising:
- a base topping cycle comprising a base gas turbine combusting fuel to produce power and a base exhaust gas flow;
a base bottoming cycle comprising an exhaust gas flow path receiving the base exhaust gas flow, the exhaust gas flow path comprising a heat recovery steam generator producing steam, and a steam turbine receiving the steam and producing power; and
a complementary gas turbine combusting fuel to produce power and providing a complementary exhaust gas flow to the base bottoming cycle exhaust gas flow path for augmenting the base bottoming cycle power production.
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Accused Products
Abstract
A method and system for augmenting the output of a combined cycle power plant having a base gas turbine (22) driving a generator (36) and a heat recovery steam generator (42) that recovers exhaust heat (30) from the base gas turbine (22) to drive a steam turbine (60). A complementary gas turbine engine (12) is added to the power plant to drive a complementary generator (14). The exhaust (A, B, C) of the complementary gas turbine (12) is merged into the flow path of exhaust gas (30) from the base gas turbine (22) upstream of a selected one or more heat exchangers (46, 50, 52) in the heat recovery steam generator (42). Such a complementary system (10) may be used together with supplemental duct burners (48) in a hybrid augmentation embodiment.
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Citations
20 Claims
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1. A combined cycle power plant comprising:
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a base topping cycle comprising a base gas turbine combusting fuel to produce power and a base exhaust gas flow;
a base bottoming cycle comprising an exhaust gas flow path receiving the base exhaust gas flow, the exhaust gas flow path comprising a heat recovery steam generator producing steam, and a steam turbine receiving the steam and producing power; and
a complementary gas turbine combusting fuel to produce power and providing a complementary exhaust gas flow to the base bottoming cycle exhaust gas flow path for augmenting the base bottoming cycle power production. - View Dependent Claims (2, 3, 4, 5)
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6. A combined cycle power plant comprising:
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a heat recovery steam generator comprising an exhaust gas flow path and a heat exchanger disposed in the exhaust gas flow path to transfer heat from the exhaust gas flow path to a working fluid;
a topping cycle comprising an exhaust connected to the exhaust gas flow path; and
a complementary internal combustion engine comprising an exhaust connected to the exhaust gas flow path for providing complementary exhaust gas to the heat exchange. - View Dependent Claims (7, 8)
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9. In a combined cycle power plant comprising a base gas turbine driving a first electrical generator, a heat recovery steam generator comprising a plurality of heat exchangers mounted in a flow path of exhaust gas received from the base gas turbine, and a steam turbine receiving steam from at least one of the heat exchangers and driving the first or a second electrical generator, an energy augmentation apparatus comprising:
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a complementary gas turbine driving a complementary electrical generator and comprising an exhaust section producing complementary exhaust gas; and
a connection introducing the complementary exhaust gas into the flow path of exhaust gas from the base gas turbine upstream of a selected one or more of the heat exchangers. - View Dependent Claims (10)
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11. A method for augmenting the power output of a combined cycle power plant, the power plant comprising a base gas turbine with an exhaust section ducted to a heat recovery steam generator comprising an exhaust flow path in which are disposed a plurality of heat exchangers for transferring heat from the exhaust flow path to a working fluid, the method comprising;
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adding to the power plant a complementary internal combustion engine comprising an exhaust section that produces complementary exhaust gas;
ducting the complementary exhaust gas into the exhaust flow path; and
controlling the complementary internal combustion engine to add complementary heat to the heat recovery steam generator. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method of generating power in a combined cycle power plant, the method comprising:
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producing shaft power by expanding a first hot compressed gas flow through a first gas turbine, thereby producing a first flow of hot expanded gas;
passing the first flow of hot expanded gas through a heat exchanger to produce pressurized steam;
producing additional shaft power expanding the pressurized steam through a steam turbine;
producing further additional shaft power by expanding a second hot compressed gas flow through a second gas turbine, thereby producing a second flow of hot expanded gas; and
merging the second flow of hot expanded gas with the first flow of hot expanded gas at a position upstream of said heat exchanger for augmenting the pressurized steam production. - View Dependent Claims (19, 20)
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Specification