US20160146060A1 - Method for operating a combined cycle power plant - Google Patents

Method for operating a combined cycle power plant Download PDF

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Publication number
US20160146060A1
US20160146060A1 US14/905,412 US201414905412A US2016146060A1 US 20160146060 A1 US20160146060 A1 US 20160146060A1 US 201414905412 A US201414905412 A US 201414905412A US 2016146060 A1 US2016146060 A1 US 2016146060A1
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United States
Prior art keywords
power
steam
turbine
operating
parked
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US14/905,412
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English (en)
Inventor
Edwin Gobrecht
Matthias Heue
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Siemens AG
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Siemens AG
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Filing date
Publication date
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Assigned to SIEMENS AKTIENGESELLSCHAFT reassignment SIEMENS AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GOBRECHT, EDWIN, HEUE, MATTHIAS
Publication of US20160146060A1 publication Critical patent/US20160146060A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
    • F01K23/101—Regulating means specially adapted therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/02—Controlling, e.g. stopping or starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
    • F01K7/22—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
    • F01K7/24—Control or safety means specially adapted therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
    • F22B1/1807—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines using the exhaust gases of combustion engines
    • F22B1/1815—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines using the exhaust gases of combustion engines using the exhaust gases of gas-turbines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]

Definitions

  • the invention relates to a method for operating a combined cycle power plant, wherein the gas turbine is operated at a GT operating power and the steam turbine is operated at an ST operating power, wherein the power of the steam turbine is reduced to an ST part power, wherein the ST part power is lower than the ST operating power.
  • Combined cycle power plants are used to generate electrical energy for communal energy supply.
  • a combined cycle power plant supplies electrical energy to a supply grid, the energy requirement being dependent on the time profile. This means that the energy requirement is not constant over the course of a day.
  • the electrical supply grid is supplied with electrical energy by multiple power plants.
  • use is made for example of conventional power plants and power plants which convert renewable energies into electrical energy. Feeding-in of the renewable energies is subject to fluctuations, which leads to increasing demands on the conventional power plants. This means that conventional power plants must be operated longer and lower in what are termed part loads or parked loads. In combined cycle power plants, such low part loads are associated—depending on the configuration of the gas turbine—with reduced gas turbine outlet temperatures.
  • the invention is based on an object of indicating another possibility for reducing thermal stresses.
  • This object is achieved by a method for operating a combined cycle power plant, wherein the gas turbine is operated at a GT operating power and the steam turbine is operated at an ST operating power, wherein the power of the steam turbine is reduced to an ST part power, wherein the ST part power is lower than the ST operating power, wherein the power of the gas turbine is then reduced to a GT parked power, wherein the GT parked power is lower than the GT operating power.
  • the power of the steam turbine is increased to an ST parked power, wherein the ST parked power is 20% to 60% of the ST operating power.
  • the invention thus proposes indicating an operating method wherein the steam turbine is involved in the parked load.
  • the steam turbine rotor keeps as much rotating mass as possible on the grid.
  • the ST power of the steam turbine is reduced to a very low power shortly before the planned commencement of the parked load.
  • the gas turbine is then operated in parked load.
  • service life consumption is significantly lower as a consequence of lowering the steam temperature. In that context, the steam turbine cools down slowly.
  • the ST part power is set at 5% to 40%, 5% to 30%, 5% to 20%, or 5% to 10% of the ST operating power.
  • the GT parked power is 20% to 60% of the gas turbine operating power.
  • the steam turbine could be held in this low part load until the end of the parked load.
  • the invention thus proposes reducing the power of the steam turbine to an ST part power.
  • the ST part power is lower than the ST operating power.
  • Reducing to the ST part power is effected by closing a steam inlet valve.
  • the steam inlet valve is controlled such that almost no fresh steam flows through the steam turbine.
  • a bypass station is formed such that there results a fluidic connection between the steam inlet and the condenser.
  • the steam turbine then cools down. After this, the power of the gas turbine is reduced to a GT parked power. This affects the steam inlet temperature. That means that the steam inlet temperature drops.
  • the steam inlet valve is then once again opened and the fluidic connection between the steam inlet and the condenser is interrupted. Thus, all of the steam generated in the steam generator is then fed through the steam turbine.
  • the steam turbine comprises a high-pressure, intermediate-pressure and low-pressure turbine section, wherein—the high-pressure turbine section,—the high-pressure turbine section and the intermediate-pressure turbine section,—the intermediate-pressure turbine section,—the intermediate-pressure turbine section and the low-pressure turbine section or—the low-pressure turbine section is/are not charged with steam.
  • one pressure stage is completely closed.
  • the service life consumption is even lower since here the components cool down naturally.
  • the pressure in the steam turbine or in the remaining operational turbine sections is reduced as much as possible, which is made possible by drains, evacuation lines, start-up lines or also process steam lines.
  • FIG. 1 shows a schematic representation of a combined cycle power plant.
  • FIG. 1 shows a schematic representation of a combined cycle power plant.
  • a combined cycle power plant 1 comprises a gas turbine 2 that can be operated with fossil fuels.
  • This gas turbine 2 comprises a compressor part 3 in which air is heated and compressed, a combustion chamber 4 in which the air from the compressor part 3 is mixed with fuel and ignited, and a turbine part 5 in which—in various stages consisting of guide vanes and rotor blades that are not shown—the hot exhaust gases turn a rotor.
  • a shaft 6 transfers this rotation to a generator 7 .
  • the generator 7 then supplies a supply grid with electrical energy (not shown).
  • the hot exhaust gases from the gas turbine 2 are fed into a steam generator 8 .
  • fresh steam is generated by means of a line 9 and is then fed via a steam turbine fresh steam line 10 into a high-pressure turbine section 11 .
  • An HP valve 12 is arranged in the steam turbine fresh steam line 10 .
  • the steam leaving the HP turbine section 11 is conveyed to an intermediate superheater 13 . This takes place via the cold intermediate superheater line 14 .
  • the hot intermediate superheater line 15 supplies steam to an intermediate-pressure turbine section 16 .
  • the steam flows via an overflow line 17 into two low-pressure turbine sections 18 .
  • the cold, expanded steam flows into a condenser 19 where it condenses to water which is conveyed, via a pump 20 , back into the fresh steam generator 8 via the fresh steam line 9 .
  • the steam turbine fresh steam line 10 is fluidically directly connected to the condenser 19 via a redirection station 21 .
  • An overflow valve 22 is arranged in the overflow line 21 .
  • An electric generator 23 is connected, in a torque-transmitting manner via a common shaft 24 , to the high-pressure turbine section 11 , the intermediate-pressure turbine section 16 and the low-pressure turbine section 18 .
  • the HP turbine section 11 , the IP turbine section 16 and the LP turbine sections 18 form the steam turbine 25 .
  • the combined cycle power plant comprises a redirection system.
  • This redirection system comprises a high-pressure redirection station 22 and a high-pressure redirection valve 21 arranged in the high-pressure redirection station 22 , wherein the high-pressure redirection station 22 establishes a fluidic connection between the steam turbine fresh steam line 10 and the cold intermediate superheater line 14 .
  • the redirection system comprises an intermediate-pressure redirection station 22 a and an intermediate-pressure redirection valve 21 a arranged in the intermediate-pressure redirection station 22 a, wherein the intermediate-pressure redirection station 22 a establishes a fluidic connection between the hot intermediate superheater line 15 and the condenser 19 .
  • steam can flow from the steam turbine fresh steam line 10 to the condenser 19 , via the redirection system comprising the high-pressure redirection station 22 and the intermediate-pressure redirection station 22 a.
  • the combined cycle power plant comprises an intermediate-pressure valve 12 a arranged in the hot intermediate superheater line 15 .
  • the combined cycle power plant is operated as follows. First, the gas turbine 2 is operated at a gas turbine operating power. Equally, the steam turbine 25 is operated at an ST operating power. The power of the steam turbine 25 is reduced to an ST part power, wherein the ST part power is lower than the ST operating power. Then, in this context, the ST part power is 5% to 40%, 5% to 30%, 5% to 20%, or 5% to 10% of the ST operating power.
  • the overflow valve 22 or the redirection system 22 , 21 ; 22 a, 21 a is opened such that the majority of the steam generated in the steam generator 8 is fed directly into the condenser 19 .
  • this is disadvantageous for the overall efficiency of the combined cycle power plant.
  • the power of the steam turbine 25 is increased to an ST parked power.
  • This ST parked power is 20% to 60% of the ST operating power. This is achieved by opening the HP valve 12 and the intermediate-pressure valve 12 a.
  • the overflow valve 22 in the overflow line 21 is closed again.
  • the volumetric flow of fresh steam is also lower.
  • the power of the steam turbine 25 is reduced by reducing the pressure of the steam. It is now possible, once the ST part power and the GT parked power have been reached, to operate the steam turbine 25 as follows.
  • the steam turbine 25 comprises a high-pressure turbine section 11 , an intermediate-pressure turbine section 16 and a low-pressure turbine section 18 , wherein the high-pressure turbine section 11 , the high-pressure turbine section 11 and the intermediate-pressure turbine section 16 , the intermediate-pressure turbine section 16 , the intermediate-pressure turbine section 16 and the low-pressure turbine section 18 or the low-pressure turbine section 18 is/are not charged with steam.
  • the remaining turbine sections remain closed and can cool down naturally.
  • the pressure of the steam in the turbine sections not charged with steam is then reduced as far as possible. To that end, drains, evacuation lines, start-up lines or process steam lines are opened.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Control Of Turbines (AREA)
US14/905,412 2013-07-25 2014-07-03 Method for operating a combined cycle power plant Abandoned US20160146060A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP13177932.4A EP2829691A1 (de) 2013-07-25 2013-07-25 Verfahren zum Betreiben einer GuD-Anlage
EP13177932.4 2013-07-25
PCT/EP2014/064182 WO2015010870A2 (de) 2013-07-25 2014-07-03 Verfahren zum betreiben einer gud-anlage

Publications (1)

Publication Number Publication Date
US20160146060A1 true US20160146060A1 (en) 2016-05-26

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ID=48914057

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US14/905,412 Abandoned US20160146060A1 (en) 2013-07-25 2014-07-03 Method for operating a combined cycle power plant

Country Status (6)

Country Link
US (1) US20160146060A1 (de)
EP (2) EP2829691A1 (de)
JP (1) JP2016528430A (de)
KR (1) KR20160023811A (de)
RU (1) RU2016106172A (de)
WO (1) WO2015010870A2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150135721A1 (en) * 2012-07-12 2015-05-21 Siemens Aktiengesellschaft Method for supporting a mains frequency
US20190040766A1 (en) * 2016-02-25 2019-02-07 Mitsubishi Hitachi Power Systems, Ltd. Combined cycle plant, method for reducing minimum output thereof, and control device therefor
US10734662B2 (en) 2016-10-17 2020-08-04 Toyota Jidosha Kabushiki Kaisha Fuel cell system and control method therefor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3258074A1 (de) * 2016-06-14 2017-12-20 Siemens Aktiengesellschaft Dampfkraftwerk zur erzeugung elektrischer energie

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5042246A (en) * 1989-11-06 1991-08-27 General Electric Company Control system for single shaft combined cycle gas and steam turbine unit
US8028511B2 (en) * 2007-05-30 2011-10-04 Mitsubishi Heavy Industries, Ltd. Integrated gasification combined cycle power generation plant

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5532916A (en) * 1978-08-25 1980-03-07 Hitachi Ltd Method of making temperature of steam turbine metal of combined plant constant and its device
JPS59180014A (ja) * 1983-03-30 1984-10-12 Hitachi Ltd コンバインドサイクル発電プラントの負荷制御方法
JPS6077704U (ja) * 1983-11-02 1985-05-30 株式会社東芝 コンバインドサイクルの主蒸気温度制御装置
CA1245282A (en) * 1984-10-25 1988-11-22 Alan Martens Steam turbine load control in a combined cycle electrical power plant
JPS62197604A (ja) * 1986-02-25 1987-09-01 Hitachi Ltd コンバインドプラントの起動方法
JPS6334404A (ja) * 1986-07-30 1988-02-15 株式会社日立製作所 コンバインドサイクルプラントにおける脱気システム
JPH0441908A (ja) * 1990-06-01 1992-02-12 Hitachi Ltd 蒸気タービンの運転制御システム
JP3073429B2 (ja) * 1995-06-20 2000-08-07 三菱重工業株式会社 多軸コンバインドプラントの蒸気系切離制御方法
JPH09303114A (ja) * 1996-05-14 1997-11-25 Mitsubishi Heavy Ind Ltd 蒸気冷却型ガスタービンを用いたコンバインドサイクル用蒸気サイクル
DE10227709B4 (de) * 2001-06-25 2011-07-21 Alstom Technology Ltd. Dampfturbinenanlage sowie Verfahren zu deren Betrieb
JP2006002576A (ja) * 2004-06-15 2006-01-05 Tlv Co Ltd 蒸気タービンを利用したプロセス蒸気の制御装置
EP1710400A1 (de) * 2005-04-05 2006-10-11 Siemens Aktiengesellschaft Verfahren zum Starten einer Gas- und Dampfturbinenanlage
US20100242430A1 (en) * 2009-03-31 2010-09-30 General Electric Company Combined cycle power plant including a heat recovery steam generator
US20100310356A1 (en) * 2009-06-04 2010-12-09 General Electric Company Clutched steam turbine low pressure sections and methods therefore
US8776523B2 (en) * 2010-12-01 2014-07-15 General Electric Company Steam-driven power plant

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5042246A (en) * 1989-11-06 1991-08-27 General Electric Company Control system for single shaft combined cycle gas and steam turbine unit
US8028511B2 (en) * 2007-05-30 2011-10-04 Mitsubishi Heavy Industries, Ltd. Integrated gasification combined cycle power generation plant

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150135721A1 (en) * 2012-07-12 2015-05-21 Siemens Aktiengesellschaft Method for supporting a mains frequency
US20190040766A1 (en) * 2016-02-25 2019-02-07 Mitsubishi Hitachi Power Systems, Ltd. Combined cycle plant, method for reducing minimum output thereof, and control device therefor
US10883389B2 (en) * 2016-02-25 2021-01-05 Mitsubishi Power, Ltd. Combined cycle plant, method for reducing minimum output thereof, and control device therefor
US10734662B2 (en) 2016-10-17 2020-08-04 Toyota Jidosha Kabushiki Kaisha Fuel cell system and control method therefor

Also Published As

Publication number Publication date
KR20160023811A (ko) 2016-03-03
WO2015010870A2 (de) 2015-01-29
WO2015010870A3 (de) 2015-03-26
JP2016528430A (ja) 2016-09-15
EP2992187A2 (de) 2016-03-09
EP2829691A1 (de) 2015-01-28
RU2016106172A (ru) 2017-08-30

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