EP2963251A1 - Wärmekraftwerkanordnung - Google Patents

Wärmekraftwerkanordnung Download PDF

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Publication number
EP2963251A1
EP2963251A1 EP14175289.9A EP14175289A EP2963251A1 EP 2963251 A1 EP2963251 A1 EP 2963251A1 EP 14175289 A EP14175289 A EP 14175289A EP 2963251 A1 EP2963251 A1 EP 2963251A1
Authority
EP
European Patent Office
Prior art keywords
pressure turbine
steam
high pressure
outlet
inlet
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.)
Withdrawn
Application number
EP14175289.9A
Other languages
English (en)
French (fr)
Inventor
Wolfgang Franz Dietrich Mohr
Klaus Helbig
Bringfried Siegfried Goll
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Technology GmbH
Original Assignee
Alstom Technology AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Alstom Technology AG filed Critical Alstom Technology AG
Priority to EP14175289.9A priority Critical patent/EP2963251A1/de
Publication of EP2963251A1 publication Critical patent/EP2963251A1/de
Withdrawn legal-status Critical Current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
    • 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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type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

Definitions

  • the present disclosure relates generally to thermal power plant configurations and more specifically to arrangements for start-up and low load operation of steam turbines of such plants.
  • a commonly used thermal power plant comprises a steam system in which steam that is generated in a boiler passed through a steam regulating valve, a high pressure turbine, a reheater and an intercept valve and then into an intermediate pressure turbine and finally into a low pressure turbine.
  • the first turbine which is commonly referred to as the high pressure turbine is a so called back pressure turbine.
  • the high pressure turbine is a so called back pressure turbine.
  • back pressure turbine During start-up or during low load operation such high pressure turbines may suffer windage.
  • US patent no 4744723 describes a start-up solution that involves the following steps.
  • the steam generated in the boiler is delivered through a high pressure bypass system that bypasses the steam regulating valve and the high pressure turbine directly into the intermediate and the low pressure turbines so as to accelerate these turbines.
  • a passage is used to connect the steam condenser and the high pressure turbine to each other so that an interior of the high pressure turbine can be kept under a vacuum condition.
  • the steam is then preferentially provided to the high pressure turbine via through the steam regulating valve instead of the high pressure bypass system.
  • a steam turbine plant arrangement is disclosed that is intended to provide a means of enabling the control of the wetness of steam at the last stage blade row of a low pressure steam.
  • the disclosure is based on the general idea of providing a bypass line connecting the exhaust of the high pressure turbine with the exhaust of the intermediate pressure steam turbine.
  • a thermal power patent comprising a boiler with a reheater and a pressure series of steam turbines.
  • the series of steam turbines includes a high pressure turbine having a high pressure turbine inlet connected to the boiler and a high pressure turbine outlet, an intermediate pressure turbine having an intermediate pressure turbine inlet connected to the high pressure turbine outlet via the reheater and an intermediate pressure turbine outlet, and a low pressure turbine with a low pressure turbine inlet connected to the medium pressure turbine outlet via the reheater.
  • the thermal power plant further includes a bypass line that fluidly connects the high pressure turbine outlet to one of a selection of the high pressure steam turbine outlet, the low pressure steam turbine inlet and a point fluidly between the medium pressure steam turbine outlet and the low pressure steam turbine inlet, while bypassing the intermediate pressure turbine and the reheater.
  • exhausted steam of the high pressure turbine may have a higher enthalpy than the steam at the inlet of the low pressure turbine.
  • the inlet temperature and pressure of the hot re-heat may be such that steam entropy-enthalpy falls below the expansion line at base load. If this occurs, the wetness of the steam at the last stage guiding blades may be too high and thus lead to serious droplet erosion during start-up.
  • the enthalpy of the steam may be increased thus avoiding the problem.
  • a thermal power patent comprises a boiler 10 with a reheater 12. Steam from the boiler 10 is feed into a high pressure turbine 20 via a high pressure turbine inlet 22 where it is expanded and work extracted. Steam exhausted from the high pressure turbine outlet 24 then passes through the reheater 12 before being fed into an intermediate pressure turbine 30 via an intermediate pressure turbine inlet 32. After expansion and extracting work in the intermediate pressure turbine 30, steam is exhausted via an intermediate turbine outlet 34 from where it is fed into a low pressure turbine inlet 42 of a low pressure turbine 40. Exhaust from the low pressure turbine 40 is then condensed in a condenser 50 before being fed back to the boiler 10 where it is boiled and fed back to the high pressure turbine 20.
  • the thermal plant further includes a bypass line 14 that connects the high pressure turbine outlet 24 with the low pressure turbine inlet 42 while bypassing the reheater 12 and the intermediate pressure turbine 30.
  • the bypass line 14 is connected to the intermediate pressure turbine outlet 34, the low pressure turbine inlet 42 or a point fluidly between the intermediate pressure turbine out 34 and the low pressure turbine inlet 42.
EP14175289.9A 2014-07-01 2014-07-01 Wärmekraftwerkanordnung Withdrawn EP2963251A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14175289.9A EP2963251A1 (de) 2014-07-01 2014-07-01 Wärmekraftwerkanordnung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14175289.9A EP2963251A1 (de) 2014-07-01 2014-07-01 Wärmekraftwerkanordnung

Publications (1)

Publication Number Publication Date
EP2963251A1 true EP2963251A1 (de) 2016-01-06

Family

ID=51162483

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14175289.9A Withdrawn EP2963251A1 (de) 2014-07-01 2014-07-01 Wärmekraftwerkanordnung

Country Status (1)

Country Link
EP (1) EP2963251A1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4744723A (en) 1986-03-07 1988-05-17 Hitachi, Ltd. Method for starting thermal power plant
US4873827A (en) * 1987-09-30 1989-10-17 Electric Power Research Institute Steam turbine plant
JPH09256815A (ja) * 1996-03-21 1997-09-30 Toshiba Corp 蒸気冷却ガスタービン，このガスタービンを用いた蒸気冷却コンバインドサイクルプラントおよびその運転方法
EP0939200A1 (de) * 1996-10-29 1999-09-01 Mitsubishi Heavy Industries, Ltd. Kühldampfsystem für dampfgekühlte Gasturbine
DE10227709A1 (de) * 2001-06-25 2003-02-27 Alstom Switzerland Ltd Dampfturbinenanlage sowie Verfahren zu deren Betrieb
WO2011030285A1 (en) * 2009-09-09 2011-03-17 Andrew Ochse Method and apparatus for electrical power production

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4744723A (en) 1986-03-07 1988-05-17 Hitachi, Ltd. Method for starting thermal power plant
US4873827A (en) * 1987-09-30 1989-10-17 Electric Power Research Institute Steam turbine plant
JPH09256815A (ja) * 1996-03-21 1997-09-30 Toshiba Corp 蒸気冷却ガスタービン，このガスタービンを用いた蒸気冷却コンバインドサイクルプラントおよびその運転方法
EP0939200A1 (de) * 1996-10-29 1999-09-01 Mitsubishi Heavy Industries, Ltd. Kühldampfsystem für dampfgekühlte Gasturbine
DE10227709A1 (de) * 2001-06-25 2003-02-27 Alstom Switzerland Ltd Dampfturbinenanlage sowie Verfahren zu deren Betrieb
WO2011030285A1 (en) * 2009-09-09 2011-03-17 Andrew Ochse Method and apparatus for electrical power production

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