EP2224096A1 - Turbine à vapeur et procédé pour extraire de l'humidité d'une turbine à vapeur - Google Patents

Turbine à vapeur et procédé pour extraire de l'humidité d'une turbine à vapeur Download PDF

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Publication number
EP2224096A1
EP2224096A1 EP09153874A EP09153874A EP2224096A1 EP 2224096 A1 EP2224096 A1 EP 2224096A1 EP 09153874 A EP09153874 A EP 09153874A EP 09153874 A EP09153874 A EP 09153874A EP 2224096 A1 EP2224096 A1 EP 2224096A1
Authority
EP
European Patent Office
Prior art keywords
slot
steam turbine
stator
end wall
moisture
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Withdrawn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
EP09153874A
Other languages
German (de)
English (en)
Inventor
Sergey Kostyuchenko
Benjamin Megerle
Thomas Mokulys
Said Havakechian
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 EP09153874A priority Critical patent/EP2224096A1/fr
Priority to DE102010007985A priority patent/DE102010007985A1/de
Priority to JP2010039512A priority patent/JP2010203438A/ja
Priority to CN201010151618.XA priority patent/CN101818660A/zh
Priority to US12/713,818 priority patent/US20100221095A1/en
Publication of EP2224096A1 publication Critical patent/EP2224096A1/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Withdrawn legal-status Critical Current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
    • F01D5/12—Blades
    • F01D5/14—Form or construction
    • F01D5/141—Shape, i.e. outer, aerodynamic form
    • F01D5/142—Shape, i.e. outer, aerodynamic form of the blades of successive rotor or stator blade-rows
    • F01D5/143—Contour of the outer or inner working fluid flow path wall, i.e. shroud or hub contour
    • 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
    • F01D25/32—Collecting of condensation water; Drainage ; Removing solid particles
    • 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
    • F05D2220/00—Application
    • F05D2220/30—Application in turbines
    • F05D2220/31—Application in turbines in steam turbines

Definitions

  • the present invention relates to a steam turbine and a method for extracting moisture from a steam turbine.
  • the present invention refers to low pressure steam turbines.
  • Steam turbine plants (in particular plants for electricity generation) are known to comprise a steam generator that feeds a turbine; the turbine expands the steam to operate an electrical generator and then discharges the exhausted steam in a condenser.
  • steam turbines in particular low pressure stages of steam turbines
  • devices that extract the moisture and discharge it to the outside.
  • stator blades With reference to the stator blades, such devices are often provided upstream of the stator blades and/or downstream of the stator blades.
  • Each stator airfoil has an end wall that is connected to the casing and from which a stator blade extends.
  • the casing Downstream of the stator airfoil the casing is provided with a circumferential slot arranged to receive the moisture that during operation (due to the centrifugal forces caused by the swirling steam flow and the rotating parts) concentrates near the end wall of the airfoils.
  • the amount of moisture that is extracted trough the slot must be as high as possible; thus the slot should be as large as possible to let a large amount of moisture be seized therein.
  • the technical aim of the present invention is therefore to provide a steam turbine and a method for extracting moisture from a steam turbine by which the said problems of the known art are eliminated.
  • an object of the invention is to provide a steam turbine and a method that let a large amount of moisture be extracted from the low pressure expansion stages with respect to traditional steam turbines, but at the same time that cause only a small extraction of dry steam.
  • Another object of the invention is to provide a steam turbine and a method that let both performance and reliability be increased with respect to traditional steam turbines.
  • the steam turbine comprises a casing 1 that contains a plurality of expansion stages.
  • Each expansion stage comprises a plurality of stator airfoils 2 downstream of which a plurality of rotor airfoils 5 are provided; in particular, each stator airfoil 2 comprises an end wall 3 that is connected to the casing 1 and from which a stator blade 4 extends.
  • the casing 1 In order to extract moisture from the steam turbine, downstream of the stator airfoils 2 of one or all the expansion stages (the enclosed figures show only one stage), the casing 1 has a circumferential slot 7 that is arranged to receive the moisture that concentrates on the end wall 3 of the stator airfoils 2 and discharge it to the outside of the steam turbine, for example via holes 8.
  • Each stator airfoil 2 has the end wall 3 that defines with the slot 7 a passage 10 through which the moisture may pass.
  • This passage 10 is smaller or closed at the suction side 12 and is larger at the pressure side 13 of each stator blade 4, to at least partially prevent the dry steam from entering the slot 7 at the suction side 12 of the blades 4.
  • each end wall 3 has a portion facing the slot 7 having a variable radial obstruction in a tangential direction.
  • the portion facing the slot 7 of the end wall 3 has at the suction side 12 a thick zone 15 that is located adjacent to the stator blade 4 and partially or completely obstructs the slot 7.
  • the portion facing the slot 7 of the end wall 3 has a thin zone 17 that is adjacent to the thick zone 15 in a tangential direction.
  • the thin zone 17 has a thickness that, in a tangential direction, continuously decreases from that of the thick zone 15 towards the side of the end wall 3.
  • the thin zone 17 also has a thickness that, in an axial direction, continuously decreases from its portion opposite the portion facing the slot 7 toward the portion facing the slot 7.
  • the steam flow flows in the axial direction (as shown by arrows F) and, when passing through the stator and rotor blades 4, 5, it turns to follow the curved channels.
  • the particular shape of the end walls 3 forces the moisture to run towards the zone of the end walls 3 at the pressure side 13 of the blades 4 (see arrows M).
  • the steam turbine of the invention lets the amount of moisture discharged be increased and/or the amount of dry steam discharged be reduced with respect to traditional steam turbines.
  • FIG. 5A shows a different embodiment of the invention.
  • the same reference numbers are used for elements already described.
  • variable radial obstruction is defined by a slope at the end wall.
  • the step has a wall 20 perpendicular to the surfaces of the thick zone 15 and thin zone 17 or, alternatively, tilted with respect to them (or at least one of them).
  • FIGS 7-9 show a further different embodiment of the invention.
  • the same reference numbers are used for elements already described.
  • variable radial obstruction is defined by a slope at the end wall; the slope projects inwardly from the leading edge 18 of each stator blade 4 to the trailing edge 19 of the same stator blade 4. Moreover the slope is adjacent to each stator blade 4 at its suction side 12.
  • the present invention also relates to a method for extracting moisture from a steam turbine that comprises a casing 1 containing a plurality of expansion stages each comprising stator and rotor airfoils and downstream of the stator airfoils of at least a stage the casing 1 is provided with a circumferential slot 7 arranged to receive the moisture that concentrates on an end wall 3 of the stator airfoils 2 and discharge it to the outside.
  • the end wall 3 of the stator airfoils 2 drives the moisture away from the suction side 12 of its blade and at least partially prevents the dry steam from entering the slot 7 at the suction side 12 of the blade 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP09153874A 2009-02-27 2009-02-27 Turbine à vapeur et procédé pour extraire de l'humidité d'une turbine à vapeur Withdrawn EP2224096A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP09153874A EP2224096A1 (fr) 2009-02-27 2009-02-27 Turbine à vapeur et procédé pour extraire de l'humidité d'une turbine à vapeur
DE102010007985A DE102010007985A1 (de) 2009-02-27 2010-02-15 Dampfturbine und Verfahren zum Extrahieren von Feuchtigkeit aus einer Dampfturbine
JP2010039512A JP2010203438A (ja) 2009-02-27 2010-02-25 蒸気タービンから水分を抽出する蒸気タービン及び方法
CN201010151618.XA CN101818660A (zh) 2009-02-27 2010-02-26 汽轮机以及用于从汽轮机吸取水分的方法
US12/713,818 US20100221095A1 (en) 2009-02-27 2010-02-26 Steam turbine and method for extracting moisture from a steam turbine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09153874A EP2224096A1 (fr) 2009-02-27 2009-02-27 Turbine à vapeur et procédé pour extraire de l'humidité d'une turbine à vapeur

Publications (1)

Publication Number Publication Date
EP2224096A1 true EP2224096A1 (fr) 2010-09-01

Family

ID=40673661

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09153874A Withdrawn EP2224096A1 (fr) 2009-02-27 2009-02-27 Turbine à vapeur et procédé pour extraire de l'humidité d'une turbine à vapeur

Country Status (5)

Country Link
US (1) US20100221095A1 (fr)
EP (1) EP2224096A1 (fr)
JP (1) JP2010203438A (fr)
CN (1) CN101818660A (fr)
DE (1) DE102010007985A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5834538B2 (ja) 2011-06-27 2015-12-24 株式会社Ihi 廃熱発電装置
JP6125351B2 (ja) 2013-06-27 2017-05-10 株式会社東芝 蒸気タービン
US10781722B2 (en) * 2015-12-11 2020-09-22 General Electric Company Steam turbine, a steam turbine nozzle, and a method of managing moisture in a steam turbine
ES2819128T3 (es) 2017-03-03 2021-04-15 MTU Aero Engines AG Contorneo de una plataforma de una rejilla de paletas
US11486255B2 (en) * 2017-09-05 2022-11-01 Mitsubishi Heavy Industries, Ltd. Steam turbine blade, steam turbine, and method for manufacturing steam turbine blade
JP7439285B2 (ja) * 2020-09-28 2024-02-27 三菱重工業株式会社 蒸気タービン

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1426836A1 (de) * 1964-05-12 1969-01-30 Merz & Mclellan Service Ltd Axial-Dampfturbine
JPS5267404A (en) * 1975-12-01 1977-06-03 Hitachi Ltd Blades structure
GB2079399A (en) * 1980-06-24 1982-01-20 Mtu Muenchen Gmbh Improvements in and relating to a rotary machine
US5112187A (en) * 1990-09-12 1992-05-12 Westinghouse Electric Corp. Erosion control through reduction of moisture transport by secondary flow
WO1998044240A1 (fr) * 1997-04-01 1998-10-08 Siemens Aktiengesellschaft Structure superficielle pour la paroi d'un canal d'ecoulement ou d'une aube de turbine
DE10327977A1 (de) * 2003-06-21 2005-01-05 Alstom Technology Ltd Seitenwandgestaltung eines umlenkenden Strömungskanals

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2111878A (en) * 1935-07-02 1938-03-22 Hermannus Van Tongeren Means for draining moisture from steam in steam turbines
DE102004043036A1 (de) * 2004-09-06 2006-03-09 Rolls-Royce Deutschland Ltd & Co Kg Strömungsarbeitsmaschine mit Fluidentnahme

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1426836A1 (de) * 1964-05-12 1969-01-30 Merz & Mclellan Service Ltd Axial-Dampfturbine
JPS5267404A (en) * 1975-12-01 1977-06-03 Hitachi Ltd Blades structure
GB2079399A (en) * 1980-06-24 1982-01-20 Mtu Muenchen Gmbh Improvements in and relating to a rotary machine
US5112187A (en) * 1990-09-12 1992-05-12 Westinghouse Electric Corp. Erosion control through reduction of moisture transport by secondary flow
WO1998044240A1 (fr) * 1997-04-01 1998-10-08 Siemens Aktiengesellschaft Structure superficielle pour la paroi d'un canal d'ecoulement ou d'une aube de turbine
DE10327977A1 (de) * 2003-06-21 2005-01-05 Alstom Technology Ltd Seitenwandgestaltung eines umlenkenden Strömungskanals

Also Published As

Publication number Publication date
CN101818660A (zh) 2010-09-01
JP2010203438A (ja) 2010-09-16
DE102010007985A1 (de) 2010-09-02
US20100221095A1 (en) 2010-09-02

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