EP2339122A1 - Turbine avec chambre d'admission à volume réglable - Google Patents

Turbine avec chambre d'admission à volume réglable Download PDF

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Publication number
EP2339122A1
EP2339122A1 EP09015958A EP09015958A EP2339122A1 EP 2339122 A1 EP2339122 A1 EP 2339122A1 EP 09015958 A EP09015958 A EP 09015958A EP 09015958 A EP09015958 A EP 09015958A EP 2339122 A1 EP2339122 A1 EP 2339122A1
Authority
EP
European Patent Office
Prior art keywords
turbine
casing
inlet
diaphragm unit
sealing
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Withdrawn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
EP09015958A
Other languages
German (de)
English (en)
Inventor
Thomas Foglander
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 EP09015958A priority Critical patent/EP2339122A1/fr
Publication of EP2339122A1 publication Critical patent/EP2339122A1/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Withdrawn legal-status Critical Current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
    • F01D9/00—Stators
    • F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
    • F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
    • 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
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
    • 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
    • F05D2230/00—Manufacture
    • F05D2230/50—Building or constructing in particular ways
    • 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
    • F05D2230/00—Manufacture
    • F05D2230/60—Assembly methods
    • F05D2230/61—Assembly methods using limited numbers of standard modules which can be adapted by machining
    • 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
    • F05D2240/10—Stators
    • F05D2240/14—Casings or housings protecting or supporting assemblies within

Definitions

  • the present invention relates to a turbine for converting energy from a flowing fluid flowing.
  • a steam turbine extracts energy from a flowing steam and is often used for the generation of electricity in thermal power plants.
  • the steam may thereby be generated using coal or fuel oil or nuclear power.
  • Gas turbines comprise upstream a compressor and a combustion chamber, where fuel is burned, wherein the burned fuel is used to drive the turbine, in particular the compressor.
  • a turbine In general a turbine comprises a rotor shaft which is rotatably supported by a bearing. Plural rotor blades are connected to the rotor shaft extending radially outwardly from the rotor shaft. The rotor blades are connected via rotor blade holders to the rotor shaft. A row of rotor blade holder may also be called a disk.
  • the rotor blades have a particularly defined surface profile such as to convert energy of a flowing fluid into a mechanical movement of the rotor blade.
  • plural rotor blades are arranged in a so-called rotor blade row substantially forming a row perpendicular to a rotation axis of the rotor shaft.
  • a turbine may comprise several rotor blade rows arranged spaced apart in an axial direction from each other.
  • a row of guide vanes is arranged that are connected to a stator part of the turbine.
  • the stator part also comprises the bearing for the rotor shaft.
  • the rotor blade rows may rotate relative to the static guide vane rows.
  • the flowing fluid used to drive the turbine often has a high temperature, a high pressure and a high velocity. Therefore, the rotor blades, the rotor blade holders as well as the guide vanes must be constructed and designed to withstand the impact of the hot, high pressure, high velocity fluid.
  • a further requirement of modern turbines is a compactness and flexible design of the turbine, in particular with respect of the casing of the turbine.
  • the volume of the fluid inputted into turbines may be different depending on the application.
  • a turbine which comprises a casing having an inlet terminal, a diaphragm unit, and a sealing ring arranged between the diaphragm unit and an inlet end sealing, wherein the casing, the diaphragm unit and the sealing ring form at least a portion of a boundary of an adjustable inlet chamber of the turbine.
  • the turbine may comprise one or more rows of rotor blades arranged on a rotor shaft.
  • the diaphragm unit may form a part or portion of a sealing element impeding the flow of the fluid through the turbine by bypassing the rotor blades, e.g. by flowing in a free region between the stator part including the casing and the rotor part including the rotor blades.
  • the inlet end sealing may be part of the stator.
  • the fluid may be either gas, e.g. combustion gas in case of a gas turbine, or steam, e.g. in case of a steam turbine.
  • gas e.g. combustion gas in case of a gas turbine
  • steam e.g. in case of a steam turbine.
  • the connecting or sealing ring together with the adjustable diaphragm unit may provide an efficient way to handle variances or tolerances introduced by the machining of the single elements.
  • the diaphragm unit comprises a plurality of diaphragm elements which are moveable with respect to each other.
  • diaphragm unit having diaphragm elements which are movable with respect to each other or relative to each other it may be possible to provide a diaphragm unit which is adjustable in length so that an efficient way to provide an adjustable inlet chamber, e.g. having an adjustable volume, may be possible.
  • Such an adjustable length of the diaphragm unit may also be an efficient way to take care of possible tolerance differences in building elements of the turbine.
  • the sealing ring is moveable with respect to the inlet end sealing.
  • the sealing ring may be moveable or slidable in an axial direction of the rotor shaft along the inlet end sealing.
  • a tight or at least substantially tight connection may be formed between the sealing ring and the inlet end sealing.
  • the sealing ring may be slidably mounted directly to the inlet end sealing while in another embodiment the sealing ring may be slidably mounted to the casing in which the inlet end sealing is mounted or fitted.
  • both mountings may provide for a sealing ring which is slidable with respect to the inlet end sealing.
  • the sealing ring is formed as a U-profile.
  • an end of the sealing ring is adapted to form fit into a recess in the diaphragm unit.
  • one leg of a U profile may form fit with a recess in the diaphragm unit.
  • the turbine further comprises a rotor shaft, wherein the inlet end sealing is part of a sealing arrangement sealing the inlet chamber with respect to the rotor shaft.
  • the inlet sealing may be part of the stator of the turbine, while the rotor shaft is part of the rotor of the turbine.
  • the inlet sealing may form part of the sealing of the stator with respect to the rotor.
  • the casing comprises a cast portion.
  • the main or bigger part of the casing may be formed by casting.
  • the inlet terminal is welded to the casing.
  • a welded inlet terminal together with a cast main body of the casing may enable a flexible adaptation of a common casing to a specific application or need.
  • a common casing may be used for different lengths of rotor assemblies or for turbine which have to handle different amount of input steam. That is, one type of casing may be used for turbines which have to handle different amounts of input fluid by just choosing an appropriate input terminal for the specific needs or application.
  • the diaphragm unit is mounted to the casing.
  • the diaphragm unit may be connected to the casing in a form fit way.
  • a projection or a ring on the diaphragm unit may fit into a recess or groove in the inner surface of the casing.
  • the recess or groove may be formed in a portion welded to the main body or cast body of the casing, for example, the groove may be formed in the region of the inlet terminal.
  • a gist of an exemplary aspect may be seen in providing a turbine having an inlet chamber which may be an efficient way to handle increasing and/or decreasing flow demands in the inlet end of the turbine.
  • This flexible handling may be provided by connecting a diaphragm unit or diaphragm package mounted in a casing to a sealing end of a stator of the turbine.
  • the main body of the casing may be cast while an inlet terminal or a region around the inlet terminal may be welded to the main body of the cast casing.
  • the welded inlet terminal or a welded inlet connection may enable the handling of a large amount of flowing fluid, e.g. steam, into the inlet end of the turbine.
  • a great flexibility of nominal size of the inlet connection may be possible while having only little impact on the total building length and smaller casing sizes by just welding another inlet terminal or inlet connection to the casing.
  • this flexibility may be increased by providing a flexible or adjustable diaphragm unit comprising a plurality of diaphragm elements which are moveable with respect to each other.
  • a flexible or adjustable sealing or connection ring may be provided which may connect the diaphragm unit mounted to the casing with an inlet end sealing arranged between the stator part of the turbine and the rotor shaft.
  • the sealing or connection ring may be flexible in that sense that it may be moveable with respect to the inlet end sealing, e.g. may be slidably mounted to the inlet end sealing.
  • a turbine comprising casing having a cast main body and an inlet terminal or inlet region which is welded to the main body of the casing.
  • the inlet region may be particularly denote the region or portion forming the inlet for gas or steam into an inlet chamber of the turbine.
  • Summarizing a turbine may enable to increase steam flow velocity and volume flow by providing an adjustable inlet chamber at least partially formed by connecting the diaphragm unit or package to the inlet end sealing, e.g. via a slidable or moveable sealing ring.
  • the inlet chamber may link the steam inputted via the inlet terminal into the steam path of the turbine, i.e. the path leading the steam through the one or more turbine blade rows.
  • the connecting or sealing ring may provide an efficient way to handle variances or tolerances introduced by the machining of the single elements.
  • the use of an inlet terminal or inlet connection welded to a main body of the casing may enable flexibility in inlet nominal size while using a standard casing size.
  • Fig. 1 shows a schematic longitudinal section of a steam turbine 100.
  • the turbine comprises a casing 101 having an inlet region or inlet terminal 102 which may be casted or welded to the cast casing 101.
  • a diaphragm unit or package 103 is mounted to the casing 101, preferably to the welded inlet region 102, e.g. by form fitting into a recess of the welded inlet region 102.
  • An additional sealing may be provided between the diaphragm unit 103 and the recess formed in the casing.
  • the turbine comprises a rotor part, formed by a rotor shaft which is not shown in Fig. 1 , which defines a longitudinal axis of the turbine.
  • the diaphragm unit 103 comprises a plurality of diaphragm elements 103a, 103b, 103c which are flexible or moveable with respect to each other, so that the length of the diaphragm unit at least along the longitudinal axis is variable or changeable.
  • the diaphragm elements may be moveable or slidably with respect to each other along a radial direction, i.e. perpendicular to the rotor shaft, so that as well a thickness or diameter of the diaphragm unit 103 with respect to the rotor shaft may be altered.
  • the diaphragm unit 103 is further connected to one end of a sealing or connection ring 104 which may be form fit to the diaphragm unit 103 and may have a U-shaped form as depicted in more detail in Fig. 2 .
  • the other end of the sealing ring 104 may be connected or mounted to an inlet end sealing 105 which is part of the stator of the turbine as well.
  • the connection of the inlet end sealing 105 and the sealing ring 104 may be slidable so that the diaphragm unit 103 can be moved with respect to the inlet end sealing at lest in the axial direction of the turbine.
  • the casing 101, the inlet terminal 102, the diaphragm unit 103, and the sealing ring 104 may form walls or borders of an inlet chamber 106 which may, even for a given size of the casing, have a variable size or volume due to the variable or slidable mounted diaphragm unit 103.
  • the inlet terminal may be adaptable to a specific application or specific needs with respect to the flow volume, even for a given size of the casing, as well, since specific different inlet terminals may be welded to the casing.
  • rotor blades 107 are schematically depicted in Fig. 1 , which may form rows of rotor blades optionally having guide vanes 110 arranged there between to guide the steam or gas from one rotor blade row downstream to the next one.
  • the inputted steam is schematically indicated by arrow 109.
  • Fig. 3 shows a schematic cross-sectional view of Fig. 1 . showing the main body of the casing 101 and the inlet terminal 102 welded to the main body of the casing at weld 308.
  • the diaphragm unit 103 and the main body of the casing 101 together may be part of or may form the casing or stator of the turbine.
  • the inlet terminal is welded to the main body of the casing different or specific inlet terminals may be implemented even for the same type or size of the main body of the casing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP09015958A 2009-12-23 2009-12-23 Turbine avec chambre d'admission à volume réglable Withdrawn EP2339122A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09015958A EP2339122A1 (fr) 2009-12-23 2009-12-23 Turbine avec chambre d'admission à volume réglable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09015958A EP2339122A1 (fr) 2009-12-23 2009-12-23 Turbine avec chambre d'admission à volume réglable

Publications (1)

Publication Number Publication Date
EP2339122A1 true EP2339122A1 (fr) 2011-06-29

Family

ID=42201006

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09015958A Withdrawn EP2339122A1 (fr) 2009-12-23 2009-12-23 Turbine avec chambre d'admission à volume réglable

Country Status (1)

Country Link
EP (1) EP2339122A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB222283A (en) * 1923-08-20 1924-10-02 Karl Baumann Improvements relating to elastic fluid turbines
US4441856A (en) * 1980-10-22 1984-04-10 Tokyo Shibaura Denki Kabushiki Kaisha Steam turbine for geothermal power generation
DE4425343A1 (de) * 1994-07-18 1996-01-25 Abb Patent Gmbh Dampfturbine mit mindestens einem Drehschieber zur geregelten Dampfentnahme
EP1249577A1 (fr) * 2001-04-12 2002-10-16 Siemens Aktiengesellschaft Turbine à gaz avec des éléments de virole axialement mobile
EP1273760A1 (fr) * 2000-05-10 2003-01-08 General Motors Corporation Turbocompresseur avec accouplement de l'anneau statorique
EP2028346A2 (fr) * 2007-08-22 2009-02-25 Kabushiki Kaisha Toshiba Turbine à vapeur
US7540708B2 (en) * 2006-06-30 2009-06-02 General Electric Company Methods and apparatus to facilitate sealing in a turbine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB222283A (en) * 1923-08-20 1924-10-02 Karl Baumann Improvements relating to elastic fluid turbines
US4441856A (en) * 1980-10-22 1984-04-10 Tokyo Shibaura Denki Kabushiki Kaisha Steam turbine for geothermal power generation
DE4425343A1 (de) * 1994-07-18 1996-01-25 Abb Patent Gmbh Dampfturbine mit mindestens einem Drehschieber zur geregelten Dampfentnahme
EP1273760A1 (fr) * 2000-05-10 2003-01-08 General Motors Corporation Turbocompresseur avec accouplement de l'anneau statorique
EP1249577A1 (fr) * 2001-04-12 2002-10-16 Siemens Aktiengesellschaft Turbine à gaz avec des éléments de virole axialement mobile
US7540708B2 (en) * 2006-06-30 2009-06-02 General Electric Company Methods and apparatus to facilitate sealing in a turbine
EP2028346A2 (fr) * 2007-08-22 2009-02-25 Kabushiki Kaisha Toshiba Turbine à vapeur

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