A supercritical heat recovery steam generator includes a duct defining an interior area and having a gas inlet and a gas outlet. The duct is configured to convey gas from the gas inlet to the gas outlet. A portion of the duct between the gas inlet and the gas outlet defines an exhaust gas flow segme
A supercritical heat recovery steam generator includes a duct defining an interior area and having a gas inlet and a gas outlet. The duct is configured to convey gas from the gas inlet to the gas outlet. A portion of the duct between the gas inlet and the gas outlet defines an exhaust gas flow segment of the interior area. A supercritical evaporator is disposed in the interior area and a reheater is disposed in the interior area. The reheater and the supercritical evaporator are disposed in the exhaust gas flow segment, adjacent to each other with respect to the flow of the exhaust gas.
대표청구항▼
1. A supercritical heat recovery steam generator comprising: a duct defining an interior area and having a gas inlet and a gas outlet, the duct being configured to convey gas from the gas inlet to the gas outlet, and a portion of the duct between the gas inlet and the gas outlet defining an exhaust
1. A supercritical heat recovery steam generator comprising: a duct defining an interior area and having a gas inlet and a gas outlet, the duct being configured to convey gas from the gas inlet to the gas outlet, and a portion of the duct between the gas inlet and the gas outlet defining an exhaust gas flow segment of the interior area;a moveable partition positioned in the interior area;a supercritical evaporator disposed in the interior area;a first stage reheater disposed in the interior area; andthe first stage reheater and the supercritical evaporator being disposed in the exhaust gas flow segment, adjacent to each other with respect to the flow of the exhaust gas,wherein the moveable partition is configured to adjust a volume between the supercritical evaporator and the first stage reheater within the interior area based on a load condition. 2. The supercritical heat recovery steam generator of claim 1, wherein: the exhaust gas flow segment has a first length extending along a longitudinal axis of the duct, from the gas inlet to the gas outlet;the supercritical evaporator has a second length extending along the longitudinal axis; andthe first stage reheater has a third length extending along the longitudinal axis, the third length being approximately equal to the second length. 3. The supercritical heat recovery steam generator of claim 1, comprising: a high pressure economizer positioned between the supercritical evaporator and the gas outlet, the high pressure economizer being in fluid communication with the supercritical evaporator. 4. The supercritical heat recovery steam generator of claim 1, wherein the first stage reheater defines a steam inlet for receiving cold reheat steam from a high pressure turbine. 5. The supercritical heat recovery steam generator of claim 1, wherein the movable partition is positioned in the interior area and configured to cause a first flow rate of the gas around a first exterior surface defined by the first stage reheater and to cause a second flow rate of the gas around second exterior surfaces of the supercritical evaporator; and the movable partition positioned to cause the first flow rate and the second flow rate to be proportional to a first heat absorption of the first reheater and a second heat absorption of the supercritical evaporator. 6. The supercritical heat recovery steam generator of claim 5, wherein the position of the movable partition is initially set for full load conditions. 7. The supercritical heat recovery steam generator of claim 1, wherein: the first stage reheater has steam flowing through a second interior area defined by the first stage reheater and the supercritical evaporator has a fluid flowing through a third interior area defined by the supercritical evaporator. 8. The supercritical heat recovery steam generator of claim 1, wherein the supercritical evaporator is a once through type. 9. A combined cycle power plant, comprising: a gas turbine system having an exhaust port configured to discharge exhaust gas;a steam turbine system comprising a high pressure section, an intermediate pressure section and a low pressure section positioned on a common shaft; anda supercritical heat recovery steam generator comprising: a duct defining an interior area and having a gas inlet and a gas outlet, the duct being configured to convey gas from the gas inlet to the gas outlet, and a portion of the duct between the gas inlet and the gas outlet defining an exhaust gas flow segment of the interior area;a moveable partition positioned in the interior area;a supercritical evaporator disposed in the interior area; a first stage reheater disposed in the interior area; andthe first stage reheater and the supercritical evaporator being disposed in the exhaust gas flow segment, adjacent to each other with respect to the flow of the exhaust gas,wherein the moveable partition is configured to adiust a volume between the supercritical evaporator and the first stage reheater within the interior area based on a load condition. 10. The combined cycle power plant of claim 9, wherein: the exhaust gas flow segment has a first length extending along a longitudinal axis of the duct, from the gas inlet to the gas outlet;the supercritical evaporator has a second length extending along the longitudinal axis; andthe first stage reheater has a third length extending along the longitudinal axis, the third length being approximately equal to the second length. 11. The combined cycle power plant of claim 9, comprising: a high pressure economizer positioned between the supercritical evaporator and the gas outlet, the high pressure economizer being in fluid communication with the supercritical evaporator. 12. The combined cycle power plant of claim 9, wherein: the high pressure section of the steam turbine system defines a cold reheat discharge line for conveying cold reheat steam therefrom; andthe first stage reheater defines steam inlet that is in communication with the cold reheat discharge line. 13. The combined cycle power plant of claim 9, wherein the partition is positioned in the interior area and configured to cause a first flow rate of the gas around a first exterior surface defined by the first steam reheater and to cause a second flow rate of the gas around second exterior surfaces of the supercritical evaporator; and the moveable partition being positioned to cause the first flow rate and the second flow rate to be proportional to a first heat absorption of the first reheater and a second heat absorption of the supercritical evaporator. 14. The combined cycle power plant of claim 13, wherein the position of the moveable partition is initially set for full load conditions. 15. The combined cycle power plant of claim 9, wherein: the first stage reheater has steam flowing through a second interior area defined by the first stage reheater and the supercritical evaporator has a fluid flowing through a third interior area defined by the supercritical evaporator. 16. The combined cycle power plant of claim 9, wherein the supercritical evaporator is a once through type. 17. A method for operating a combined cycle power plant comprising; providing a gas turbine system having an exhaust port;providing a steam turbine system comprising a high pressure section;providing a supercritical heat recovery steam generator comprising a duct defining an interior area, a moveable partition positioned in the interior area, a supercritical evaporator disposed in the interior area and a first steam reheater disposed in the interior area, the first stage reheater and the supercritical evaporator being disposed, adjacent to each other with respect to the flow of the exhaust gas, in a common exhaust gas flow segment defined by a portion of the interior area;moving the partition to adjust a volume between the supercritical evaporator and the first stage reheater within the interior area based on a load condition;discharging exhaust from the gas turbine system;supplying cold reheat steam from the steam turbine system to the first stage reheater; supplying a fluid to the supercritical evaporator; andflowing the exhaust gas in parallel flow paths around exterior surfaces defined by the first stage reheater and the supercritical evaporator. 18. The method of claim 17 wherein the cold reheat steam and the fluid are at approximately equal temperatures.
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이 특허에 인용된 특허 (6)
Fujita, Issaku; Osone, Toru; Hayashi, Kazuki, Combined cycle electric power generation plant and heat exchanger.
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