Combined cycle power plant having condensate recirculation pump using venturi effect
AssigneeSiemens Energy, Inc.
InventorMohamed Elfadli
Life of this patent
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Abstract
A combined cycle power plant and a method for operating a combined cycle power plant are presented. The combined cycle power plant includes a condensate recirculation pump to recirculate flow medium from downstream of a condensate preheater system to upstream of the condensate preheater system. An adequate flow temperature at the upstream of the condensate preheater system may be maintained to prevent acid gas dew point corrosion. The condensate recirculation pump may use a venturi effect to convert a high pressure of a condensate supplied by a condensate extraction pump to a suction pressure for the recirculation.
Claims20
A combined cycle power plant comprising:
- a gas turbine that is configured to generate power output and produce exhaust gas;
- a heat recovery steam generator that is configured to receive the exhaust gas from the gas turbine and produce steam by extracting energy from the exhaust gas;
- a steam turbine that is configured to receive the steam produced in the heat recovery steam generator and generate power output;
- and
- a condenser that is configured to receive condensate from the steam turbine,
- wherein the heat recovery steam generator comprises:
- a condensate extraction pump that is configured to extract the condensate from the condenser;
- a condensate preheater system arranged downstream of the condensate extraction pump that is configured to preheat the condensate;
- and
- a condensate recirculation pump that is configured to recirculate flow medium from downstream of the condensate preheater system to upstream of the condensate preheater system to maintain a temperature of the condensate at the upstream of the condensate preheater system at a predetermined temperature,
- wherein the condensate recirculation pump comprises a suction zone formed by a venturi effect for the recirculation.
A method for operating a combined cycle power plant, wherein the combined cycle power plant comprises a gas turbine, a heat recovery steam generator, a steam turbine and a condenser, the method comprising:
- operating the gas turbine to generate power output and produce exhaust gas;
- producing steam in the heat recovery steam generator by extracting energy from the exhaust gas;
- operating the steam turbine to generate power output from the steam produced in the heat recovery steam generator;
- and
- receiving condensate from the steam turbine to the condenser,
- wherein the heat recovery steam generator comprises a condensate exaction pump, a condensate preheater system arranged downstream of the condensate exaction pump, and a condensate recirculation pump,
- wherein the method further comprising:
- extracting the condensate from the condenser by the condensate exaction pump;
- preheating the condensate in the condensate preheater system;
- recirculating flow medium from downstream of the condensate preheater system to upstream of the condensate preheater system by the condensate recirculation pump, wherein the condensate recirculation pump comprises a suction zone formed by a venturi effect for the recirculation;
- and
- maintaining a temperature of the condensate at the upstream of the condensate preheater system at a predetermined temperature by mixing the flow medium from the downstream of the condensate preheater system with the condensate extracted from the condenser.
A heat recovery steam generator in a combined cycle power plant, wherein the combined cycle power plant comprises a gas turbine, a steam turbine and a condenser, wherein the heat recovery steam generator comprising:
- a condensate extraction pump that is configured to extract the condensate from the condenser;
- a condensate preheater system arranged downstream of the condensate extraction pump that is configured to preheat the condensate;
- and
- a condensate recirculation pump that is configured to recirculate flow medium from downstream of the condensate preheater system to upstream of the condensate preheater system to maintain a temperature of the condensate at the upstream of the condensate preheater system at a predetermined temperature,
- wherein the condensate recirculation pump comprises a suction zone formed by a venturi effect for the recirculation.
Dependencies are inferred from the claim text.