EP1707739A1 - Turbine à vapeur avec arbre creux refroidi et méthode de refroidissement correspondante - Google Patents

Turbine à vapeur avec arbre creux refroidi et méthode de refroidissement correspondante Download PDF

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Publication number
EP1707739A1
EP1707739A1 EP05006651A EP05006651A EP1707739A1 EP 1707739 A1 EP1707739 A1 EP 1707739A1 EP 05006651 A EP05006651 A EP 05006651A EP 05006651 A EP05006651 A EP 05006651A EP 1707739 A1 EP1707739 A1 EP 1707739A1
Authority
EP
European Patent Office
Prior art keywords
shaft
cooling medium
steam turbine
axial bore
cooling
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Withdrawn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
EP05006651A
Other languages
German (de)
English (en)
Inventor
Albert Dr. Bagaviev
Yevgen Dr. Kostenko
Traugott Paul
Kai Dr. Wieghardt
Uwe Zander
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Priority to EP05006651A priority Critical patent/EP1707739A1/fr
Publication of EP1707739A1 publication Critical patent/EP1707739A1/fr
Withdrawn legal-status Critical Current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
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/02—Blade-carrying members, e.g. rotors
    • F01D5/08—Heating, heat-insulating or cooling means
    • F01D5/085—Heating, heat-insulating or cooling means cooling fluid circulating inside the rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/60—Shafts
    • F05D2240/61—Hollow

Definitions

  • the invention relates to a steam turbine with a rotatably mounted shaft and a method for cooling a rotatably mounted shaft of a steam turbine.
  • a steam turbine of known type has a rotor arranged on a shaft with rotor blades rotatable between guide vanes of a surrounding housing. Expansion of incoming steam propels and rotates the blades.
  • the rotating shaft usually drives a generator to generate electrical energy.
  • a steam turbine can be configured as single-flow or multi-flow. Also, the steam turbine may include a number of part steam turbine, which are connected in series.
  • a distinction is made with respect to the vapor pressure in this case a high-pressure turbine section, the steam is fed, a medium-pressure turbine section, which is supplied to the steam from the outlet of the high-pressure turbine section, and a low-pressure turbine section, which is supplied to the steam from the outlet of a medium-pressure turbine section.
  • To increase the temperature of the drive steam at medium-pressure and low-pressure steam turbine parts is passed before inflow via a reheater.
  • the steam turbine parts can also be arranged on a common shaft.
  • the rotor and the shaft of a steam turbine are subjected to the drive steam depending on the turbine type with temperatures well above 500 ° C and are also exposed to high mechanical loads.
  • the material selection is therefore subject to significant restrictions. It must be used high quality material.
  • the object of the invention is to provide a steam turbine of the type mentioned with an effective cooling of the shaft. Further, it is an object of the invention to provide an effective method for cooling the shaft.
  • the first-mentioned object is achieved for a steam turbine with a rotatably mounted shaft according to the invention in that the shaft is formed at least along a partial section as a hollow shaft with an axial bore through which a cooling medium can flow.
  • the invention is based on the consideration that a cooling medium flowing through a hollow shaft of a steam turbine acts on the wall of the axial bore due to the centrifugal acceleration caused by the rotation of the shaft. This leads to an effective heat exchange between the cooling medium and the shaft with the rotor arranged thereon. Cooling via cooling steam can be omitted.
  • a cooling medium for example, oil or water is suitable. However, other suitable cooling media are also conceivable.
  • the introduction of the cooling medium into the axial bore can be effected axially (for instance on one of the two end faces of the shaft) or radially through the shaft.
  • a pump arrangement with suitable control or control can be provided.
  • the cooling medium can be cooled in particular outside the axial bore by a cooling device or by a heat exchanger.
  • a flow through the axial bore can be achieved in its entire length. It can be introduced into the shaft in particular with respect to the cross section of the shaft a plurality of radial channels. It is also conceivable to guide the shaft with the introduced radial channels in a surrounding bearing for the cooling medium. In this way, the supply or discharge of the cooling medium is ensured in a suitable amount.
  • the axial bore in areas of the shaft with very high heat input due to the vapor wetting to increase the effective cooling surface is increased locally.
  • Such an area is, for example, the area of the steam inflow. Due to the enlargement or thickening of the bore and thus by the reduced wall thickness of the shaft, the cooling effect of the cooling medium, in particular as a result of the centrifugal acceleration, can be further enhanced.
  • the object with regard to a method for cooling a rotatably mounted shaft of a steam turbine is inventively achieved in that a cooling medium is passed through an axial bore of the shaft.
  • the advantages achieved by the invention are in particular that by the introduction of a liquid cooling medium In an axial bore of a steam turbine shaft, a particularly effective cooling of the shaft and the rotor components arranged on it can be achieved.
  • An increase in the creep rupture strength and slowing down of the material creep that can be achieved thereby contribute to an increased service life of the components concerned.
  • the guided in the axial bore of the shaft cooling medium can be used as a heating medium during transient operating phases of the steam turbine, especially when starting and stopping.
  • pre- or post-heating the shaft By pre- or post-heating the shaft, shorter arrival and departure times can be realized. Compressive stresses in the shaft interior, such as occur during cold start of the steam turbine, are reduced by the preheating of the shaft.
  • a combined high-pressure / medium-pressure steam turbine 1 is shown in a longitudinal section schematically.
  • the steam turbine 1 comprises a high-pressure expansion section 2 and a medium-pressure expansion section 3, which are flowed through in opposite directions by steam.
  • the rotors 4 and 5 are arranged on a common shaft 6.
  • the shaft 6 is formed in sections as a hollow shaft with a centrally extending axial bore 8.
  • the shaft 6 is mounted on the shaft bearing 10 in bearing journals, not shown.
  • Radial channels 12 and 13 open into the axial bore 8 at the shaft bearings 10, wherein the radial channels 12 for the removal and the radial channels 13 for the supply of a cooling medium 14 are provided from or into the axial bore 8.
  • the radial channels 12 and 13 are fluidically connected to a bearing 15 for the cooling medium 14 or during the rotation of the shaft 6 connectable.
  • the introduced into the shaft 6 radial channels 12 and 13 are shown in more detail in the cross-section A-A shown in FIG 2.
  • the cooling medium 14 flows through the axial bore 8 and thereby absorbs heat.
  • the cooling medium is pressed outwards against the wall of the axial bore 8, so that a good heat transfer between the material of the shaft 6 and the cooling medium 14 is automatically established.
  • the cooling medium 14 oil is used in the embodiment.
  • the axial bore 8 does not continuously pass through the shaft 6, but is divided by separating devices 17.
  • a separator 17 in particular the shaft 6 can not be pierced at this point.
  • the shaft 6 is divided into individual sections 18, which are flowed through separately from the cooling medium. This allows a better heat dissipation and thus an increase in the cooling effect.
  • this is introduced into the radial channels 13 by means of a pressure pump 20 not shown under pressure. After flowing through the section 18 in the direction of arrows 22 occurs the cooling medium via the radial channels 12 again from the axial bore 8, and then before a renewed feed z. B. are cooled by a heat exchanger.
  • the rotor 4 or 5 and the shaft 6 are exposed to a particularly high temperature load.
  • the cooling effect of the cooling medium 14 is increased.
  • FIG. 2 shows in a cross section A-A through the shaft 6 at the location of a shaft bearing 10 according to FIG. 1 for the removal of the cooling medium introduced radial channels 13.
  • the provided for oil supply radial channels 12 are introduced into the shaft 6 in the same way.
  • the radial channels 13 each extend obliquely outward starting from the axial bore 8.
  • the shaft cooling can be designed so that the cooling medium 14, for example oil or water, is present in liquid form over the entire course of the flow path within the shaft 6 and thereby completely fills the axial bore 8.
  • the cooling medium 14, in this case preferably water is at least partially vaporized when flowing through the hollow shaft, the heat being extracted from the rotor 4, 5 in a particularly effective manner by the evaporation.
  • the undiluted portion of cooling medium 14 is due to the prevailing in the rotating shaft 6 centrifugal forces as liquid film 27 down the walls of the axial bore 8 and is discharged at the outlet end 28 of the shaft 6, for example, through a hole in the end face.
  • the vapor 29 forming inside the axial bore 8 by evaporation of the cooling medium 14 and under pressure is in the form of saturated steam through a number of the shaft walls penetrating radial channels 12 discharged from the shaft 6 and introduced into a surrounded by the outer casing 32 of the steam turbine 1 steam space.
  • the vapor removal takes place automatically due to the pressure difference between the shaft interior and the steam space, so that no additional funding such as pumps, etc. are necessary.
  • steam outlet pipes 30 are inserted into the radial ducts 12.
  • the steam outlet pipes 30 protrude so far into the cavity of the shaft 6 formed by the axial bore 8 that only the vapor portion of the cooling medium 14, but not the liquid film 27 on the wall of the axial bore 8 can escape through the steam outlet pipes 30.
  • cooling medium 14 usable water can be removed in a preferred embodiment of the invention from the water-steam cycle of a steam turbine 1 and a steam generator comprehensive steam turbine plant.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP05006651A 2005-03-24 2005-03-24 Turbine à vapeur avec arbre creux refroidi et méthode de refroidissement correspondante Withdrawn EP1707739A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05006651A EP1707739A1 (fr) 2005-03-24 2005-03-24 Turbine à vapeur avec arbre creux refroidi et méthode de refroidissement correspondante

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05006651A EP1707739A1 (fr) 2005-03-24 2005-03-24 Turbine à vapeur avec arbre creux refroidi et méthode de refroidissement correspondante

Publications (1)

Publication Number Publication Date
EP1707739A1 true EP1707739A1 (fr) 2006-10-04

Family

ID=34934534

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05006651A Withdrawn EP1707739A1 (fr) 2005-03-24 2005-03-24 Turbine à vapeur avec arbre creux refroidi et méthode de refroidissement correspondante

Country Status (1)

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EP (1) EP1707739A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110308251A1 (en) * 2009-02-10 2011-12-22 Matthias Heue Method for heating a turbine shaft

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE567576C (de) * 1931-11-25 1933-01-05 Bbc Brown Boveri & Cie Gasturbinenwelle mit Innenkuehlung
DE735505C (de) * 1940-03-01 1943-05-17 Maschf Augsburg Nuernberg Ag Turbinenlaeufer
DE915088C (de) * 1941-09-09 1954-07-15 Karl Leist Dr Ing Kuehlung fuer Turbomaschinenanlagen
DE1038839B (de) * 1957-06-07 1958-09-11 Basf Ag Anordnung zum Betrieb von Gasturbinen mit Verdampfungskuehlung des Laeufers
JPS5934402A (ja) * 1982-08-20 1984-02-24 Hitachi Ltd 蒸気タ−ビンのロ−タ装置
GB2136531A (en) * 1983-03-16 1984-09-19 Rolls Royce Fluid leakage prevention in shafts
US5498131A (en) * 1995-03-02 1996-03-12 General Electric Company Steam turbine with thermal stress reduction system
US6227799B1 (en) * 1997-06-27 2001-05-08 Siemens Aktiengesellschaft Turbine shaft of a steam turbine having internal cooling, and also a method of cooling a turbine shaft
WO2004113684A1 (fr) * 2003-06-16 2004-12-29 Siemens Aktiengesellschaft Turbomachine, en particulier turbine a gaz

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE567576C (de) * 1931-11-25 1933-01-05 Bbc Brown Boveri & Cie Gasturbinenwelle mit Innenkuehlung
DE735505C (de) * 1940-03-01 1943-05-17 Maschf Augsburg Nuernberg Ag Turbinenlaeufer
DE915088C (de) * 1941-09-09 1954-07-15 Karl Leist Dr Ing Kuehlung fuer Turbomaschinenanlagen
DE1038839B (de) * 1957-06-07 1958-09-11 Basf Ag Anordnung zum Betrieb von Gasturbinen mit Verdampfungskuehlung des Laeufers
JPS5934402A (ja) * 1982-08-20 1984-02-24 Hitachi Ltd 蒸気タ−ビンのロ−タ装置
GB2136531A (en) * 1983-03-16 1984-09-19 Rolls Royce Fluid leakage prevention in shafts
US5498131A (en) * 1995-03-02 1996-03-12 General Electric Company Steam turbine with thermal stress reduction system
US6227799B1 (en) * 1997-06-27 2001-05-08 Siemens Aktiengesellschaft Turbine shaft of a steam turbine having internal cooling, and also a method of cooling a turbine shaft
WO2004113684A1 (fr) * 2003-06-16 2004-12-29 Siemens Aktiengesellschaft Turbomachine, en particulier turbine a gaz

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 132 (M - 303) 20 June 1984 (1984-06-20) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110308251A1 (en) * 2009-02-10 2011-12-22 Matthias Heue Method for heating a turbine shaft

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