Fuel Heating in Combined Cycle Turbomachinery
OwnerJohn Edward Sholes, Douglas Frank Beadie +1inventors
InventorsJohn Edward Sholes, Douglas Frank Beadie, Kamlesh Mundra
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Abstract
Combined cycle efficiency can be improved by heating fuel in a gas turbine fuel line in two stages using (i) hot water from an HP economizer of a heat recovery steam generator (HRSG) in a second stage and (ii) hot water from an IP economizer of the HRSG and water output flow from the second stage in a first stage. Efficiency may be further improved by adding one or more fuel preheaters using hot water from the IP feedpump and sequential injections of hot water into the fuel.
Claims18
A method of improving efficiency of a combined cycle turbomachine, the turbomachine including a gas turbine, a heat recovery steam generator (HRSG) receiving gas turbine exhaust and generating steam, and a steam turbine receiving the steam from the HRSG, the method comprising:
- (a) providing a fuel line for inputting fuel into the gas turbine;
- (b) heating the fuel in a first fuel heater using water input from an intermediate pressure economizer of the HRSG to an inlet of the first fuel heater;
- (c) heating the fuel in a second fuel heater downstream from the first fuel heater using water input from a high pressure economizer of the HRSG;
- and
- (d) directing water output from the second fuel heater to one of an intermediate pressure section of the HRSG or the inlet of the first fuel heater.
A method of improving efficiency of a combined cycle turbomachine, the method comprising:
- (a) providing a fuel line for inputting fuel into the gas turbine;
- and
- (b) heating the fuel in two stages using (i) hot water from an HP economizer of a heat recovery steam generator (HRSG) in a second stage and (ii) hot water from an IP economizer of the HRSG and water output flow from the second stage in a first stage.
A fuel heating circuit for a combine cycle turbomachine, the turbomachine including a gas turbine, a heat recovery steam generator (HRSG) receiving gas turbine exhaust and generating steam, and a steam turbine receiving the steam from the HRSG, the fuel heating circuit comprising:
- a fuel line that supplies fuel to the gas turbine;
- a first heater on the fuel line, the first heater receiving hot water output from an intermediate pressure economizer of the HRSG via a heater inlet;
- a second heater on the fuel line, downstream from the first heater, the second heater receiving hot water output from a high pressure economizer of the HRSG;
- and
- an output line from the second heater delivering water output from the second heater to one of an intermediate pressure section of the HRSG or the heater inlet of the first fuel heater.
Dependencies are inferred from the claim text.