The invention relates to a method for operating a steam power plant, particularly a combined cycle power plant, which includes a gas turbine an a steam/water cycle with a heat recovery steam generator, through which the exhaust gases of the gas turbine flow, a water-cooled condenser, a feedwater pum
The invention relates to a method for operating a steam power plant, particularly a combined cycle power plant, which includes a gas turbine an a steam/water cycle with a heat recovery steam generator, through which the exhaust gases of the gas turbine flow, a water-cooled condenser, a feedwater pump and a steam turbine. A cooling water pump is provided for pumping cooling water through said water-cooled condenser. Evacuating means are connected to the water-cooled condenser for evacuating at least said water-cooled condenser. The method relates to a shut down and start-up of the power plant after the shutdown. The method includes: a) shut down of the steam turbine and gas turbine and/or a combustor of said gas turbine ;b) restoration of a good vacuum within the condenser by using said evacuating means;c) stopping said cooling water pump of said water-cooled condenser and said evacuating means, and filling up at least said condenser with steam up to slightly above atmospheric pressure;d) controlling the pressure with a flow of said cooling water;e) after a certain shut-down period starting the cooling water pump just before start-up of the plant; andf) starting the plant.
대표청구항▼
1. A method for operating a steam power plant, comprising a steam generator, a steam turbine and a steam/water cycle, at least consisting of a water-cooled condenser, a deaerator and a feedwater pump, whereby a cooling water pump is provided for pumping cooling water through said water-cooled conden
1. A method for operating a steam power plant, comprising a steam generator, a steam turbine and a steam/water cycle, at least consisting of a water-cooled condenser, a deaerator and a feedwater pump, whereby a cooling water pump is provided for pumping cooling water through said water-cooled condenser, and evacuating means are connected to said water-cooled condenser for evacuating at least said water-cooled condenser, said operating method being related to a shut down and start-up of said power plant after said shut down and comprising the steps of: a) shut down of the steam turbine;b) restoration of a good vacuum within the condenser by using said evacuating means;c) stopping said cooling water pump of said water-cooled condenser and said evacuating means, and filling up the vacuum portion of the steam/water cycle, at least said condenser, with steam up to slightly above atmospheric pressure;d) controlling the pressure with a flow of said cooling water;e) after a certain shut-down period starting the cooling water pump just before start-up of the plant; andf) starting the plant. 2. A method for operating a combined cycle power plant, comprising a gas turbine and a steam/water cycle with a heat recovery steam generator, through which the exhaust gases of the gas turbine flow, a water-cooled condenser, a feedwater pump and a steam turbine, whereby a cooling water pump is provided for pumping cooling water through said water-cooled condenser, and evacuating means are connected to said water-cooled condenser for evacuating at least said water-cooled condenser, said operating method being related to a shut down and start-up of said power plant after said shut down and comprising the steps of: a) shut down of the steam turbine and gas turbine and/or a combustor of said gas turbine ;b) restoration of a good vacuum within the condenser by using said evacuating means;c) stopping said cooling water pump of said water-cooled condenser and said evacuating means, and filling up the vacuum portion of the steam/water cycle, at least said condenser, with steam up to slightly above atmospheric pressure;d) controlling the pressure with a flow of said cooling water;e) after a certain shut-down period starting the cooling water pump just before start-up of the plant; andf) starting the plant. 3. The method according to claim 1, wherein the steam turbine comprises a low-pressure steam turbine, and the condenser and said low-pressure steam turbine are filled up with steam in step (c). 4. The method according to claim 1, wherein the steam for filling up said condenser is taken from the steam/water cycle. 5. The method according to claim 4, wherein the steam turbine has a steam-sealed gland, and gland steam is used for filling up said condenser. 6. The method according to claim 4, wherein the steam turbine has a low-pressure steam turbine with a steam bypass, and the steam for filling up the vacuum portion of the steam/water cycle, at least said condenser, is taken from the LP steam bypass. 7. The method according to claim 4, wherein the steam turbine has a low-pressure steam turbine with an auxiliary LP drum, and the steam for filling up the vacuum portion of the steam/water cycle, at least said condenser, is taken from the LP steam bypass. 8. The method according to claim 1, wherein at least the condenser has an insulation. 9. The method according to claim 1, further comprising a condenser bypass is used to control the pressure in the condenser. 10. The method according to claim 1, wherein the built up inversion layer on the hot well is used to avoid heat loss. 11. The method according to claim 1, wherein the ejector is started as soon as possible at startup procedure to extract the gases diffused into the steam.
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이 특허에 인용된 특허 (4)
Labbe Donald E. (Woburn MA) Brown ; Jr. Mayo E. (Milton MA), Attemperator-deaerator condenser.
Martz Lyle F. (Verona PA) Kiscaden Roy W. (Springfield PA) Uram Robert (East Pittsburgh PA), Gas turbine and steam turbine combined cycle electric power generating plant having a coordinated and hybridized control.
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