US20080213091A1 - Steam Turbine - Google Patents

Steam Turbine Download PDF

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Publication number
US20080213091A1
US20080213091A1 US12/033,091 US3309108A US2008213091A1 US 20080213091 A1 US20080213091 A1 US 20080213091A1 US 3309108 A US3309108 A US 3309108A US 2008213091 A1 US2008213091 A1 US 2008213091A1
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US
United States
Prior art keywords
steam
steam turbine
inner casing
passages
blade carriers
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
Application number
US12/033,091
Other languages
English (en)
Inventor
Heinrich Lageder
Lucjan Lukasik
Ralf Greim
Thomas Schreier
Michael Fischer
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
Individual
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 Individual filed Critical Individual
Assigned to ALSTOM TECHNOLOGY LTD reassignment ALSTOM TECHNOLOGY LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GREIM, RALF, LAGEDER, HEINRICH, FISCHER, MICHAEL, LUKASIK, LUCJAN, SCHREIER, THOMAS
Publication of US20080213091A1 publication Critical patent/US20080213091A1/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
    • 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
    • F01D25/26—Double casings; Measures against temperature strain in casings
    • 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
    • F01D25/28—Supporting or mounting arrangements, e.g. for turbine casing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/30—Retaining components in desired mutual position
    • F05B2260/301—Retaining bolts or nuts
    • 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
    • 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
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/21—Manufacture essentially without removing material by casting
    • 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
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
    • F05D2230/232—Manufacture essentially without removing material by permanently joining parts together by welding
    • 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
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
    • F05D2230/232—Manufacture essentially without removing material by permanently joining parts together by welding
    • F05D2230/235—TIG or MIG welding
    • 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 the field of thermal machines, and more particularly to a steam turbine.
  • the inlet scroll is integrated into the inner casing, as well as a plurality of steam extraction chambers into which steam, at a specified pressure, can flow from the steam passages through openings in the inner casing, and be extracted. Furthermore, the inner casing, on the sides which delimit the steam passages, serves as a carrier for a multiplicity of fixed stator blades which project into the steam passages.
  • the inner casing With the known low-pressure steam turbines, the inner casing, with the inlet scroll and the steam extraction chambers, is divided along a horizontal parting plane into an upper half and a lower half.
  • the two halves are produced in each case as one-piece cast parts, preferably from nodular cast iron. This technique allows the production of large castings with complicated shape (with inlet scroll, steam extraction chambers and exhaust diffuser) at low cost.
  • the stator blade carriers in this case are integrated into the inner casing.
  • a low-pressure turbine section which is designed in a multi-shell, entirely welded construction, is known from U.S. Pat. No. 3,594,095.
  • a scroll-shaped inlet duct in this case is not provided.
  • One of numerous aspects of the invention includes creating a steam turbine which addresses the disadvantages of known steam turbines and which, in particular, includes an inner casing which can be more easily and more cost-effectively produced.
  • the inner casing is formed as a welded construction, in which the blade carriers, for fastening the stator blades, which blade carriers delimit the steam passages and are produced as castings, are supported by additional forged or rolled steel elements. Since the cast parts with this solution are limited to the blade carriers and, therefore, are formed in a smaller and less complicated manner, fewer fabrication and repair problems result. At the same time, radial and axial deformations of the blade carriers are less than with an integrated cast casing, so that narrower gaps at the blade tips, and therefore higher efficiency of the turbine, are possible.
  • the inlet duct which tapers in the flow cross section, is formed as an inlet scroll.
  • Another aspect includes a plurality of steam extraction chambers formed in the inner casing, and the steam extraction chambers are formed or delimited by the blade carriers and the steel elements which are welded to them.
  • a further aspect of the invention includes that support rings, which are arranged concentrically to the axis with axial spacing and which support the blade carriers on their rear side, are provided for stiffening the inner casing, tie rods are provided between the support rings for absorbing transverse forces, and the steel elements are welded to the support rings.
  • the tie rods can especially be welded or screwed to the support rings.
  • At least one radial guide vane is arranged in the inlet duct.
  • the blade carriers consist of nodular cast iron or cast steel.
  • FIG. 1 shows, in longitudinal section, a double-flow low-pressure steam turbine with its inner casing according to an exemplary embodiment of the invention
  • FIG. 2 shows the section along the center plane II-II in FIG. 1 .
  • FIG. 1 a double-flow low-pressure steam turbine, with its inner casing according to an exemplary embodiment of the invention, is represented in longitudinal section.
  • FIG. 2 shows the section of this turbine in the center plane (plane II-II in FIG. 1 ).
  • the steam turbine 10 is constructed with its two flows mirror-symmetrical to a vertical center plane 30 . It includes a rotor 11 , which is rotatable around a horizontal axis 21 and concentrically enclosed with a spacing by an inner casing 13 .
  • Outwards widening annular steam passages 28 , 29 are formed between the rotor and the inner boundary wall of the inner casing, through which the steam, which is fed radially in the center, flows outwards and, expanding on the rotor blades 12 which are fastened on the rotor 11 , performs work.
  • the blade carriers 14 are cast parts and preferably are formed of nodular cast iron or cast steel. They are a part of the inner casing 13 and form the boundary walls for the steam passages 28 , 29 .
  • the inner casing 13 is altogether formed as a welded construction, in which the blade carriers 14 are supported on the outside in an axially movable manner by forged or rolled steel elements 20 , and are sealed by sealing elements.
  • the welded plate-form steel elements 20 not only form a scroll-shaped inlet duct or an inlet scroll 15 in the central section of the steam turbine, but also form a plurality of steam extraction chambers 16 on the two sides of the center plane 30 .
  • the steel elements 20 do not bear directly on the blade carriers 14 , but bear via support rings 18 , which are arranged concentrically to the axis 21 with axial spacing for stiffening the inner casing 13 .
  • Tie rods 17 which by their ends are fastened on the support rings 18 , especially screwed or welded, are provided between the support rings 18 for absorbing transverse forces.
  • the scroll-shaped inlet duct 15 is delimited on the outside by a scroll casing 24 which (on account of the splitting of the inner casing 13 in the parting plane 25 ) is constructed from simple steel plates.
  • At least one radial guide vane 19 which serves for deflection of the steam which flows in through the steam inlet 23 , is arranged in the inlet duct 15 .
  • the inner casing 13 is split in the horizontal parting plane 25 . As well as the outer casing 26 , it is supported by a support construction 27 which lies beneath it and which in turn bears upon the outer casing 22 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
US12/033,091 2007-03-02 2008-02-19 Steam Turbine Abandoned US20080213091A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3492007 2007-03-02
CH00349/07 2007-03-02

Publications (1)

Publication Number Publication Date
US20080213091A1 true US20080213091A1 (en) 2008-09-04

Family

ID=38093606

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/033,091 Abandoned US20080213091A1 (en) 2007-03-02 2008-02-19 Steam Turbine

Country Status (4)

Country Link
US (1) US20080213091A1 (ru)
JP (1) JP2008240725A (ru)
CN (1) CN101255802A (ru)
DE (1) DE102008000284A1 (ru)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120195752A1 (en) * 2011-02-01 2012-08-02 General Electric Company Stiffening system for steam turbine casing
EP2487336A1 (en) * 2011-02-11 2012-08-15 Alstom Technology Ltd Exhaust device for a steam turbine module
US9091181B2 (en) 2010-12-24 2015-07-28 Alstom Technology Ltd. Module for a steam turbine
US9447699B2 (en) 2011-07-15 2016-09-20 Siemens Aktiengesellschaft Steam turbine housing
US9605561B2 (en) 2013-03-13 2017-03-28 General Electric Company Modular turbomachine inlet assembly and related inlet transition section
US9683450B2 (en) 2013-03-13 2017-06-20 General Electric Company Turbine casing inlet assembly construction
US20170234162A1 (en) * 2016-02-17 2017-08-17 General Electric Technology Gmbh Steam turbine inner casing component and repair method therefor
CN114508392A (zh) * 2021-12-29 2022-05-17 东方电气集团东方汽轮机有限公司 一种汽轮机高压进汽室结构
US20220220862A1 (en) * 2019-04-17 2022-07-14 General Electric Company Turbine casing component and repair method therefor

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2184445A1 (de) * 2008-11-05 2010-05-12 Siemens Aktiengesellschaft Axial segmentierter Leitschaufelträger für einen Gasturbine
RU112275U1 (ru) * 2010-10-01 2012-01-10 Альстом Текнолоджи Лтд Узел паровой турбины
JP5606299B2 (ja) * 2010-12-08 2014-10-15 三菱重工業株式会社 タービンの蒸気入口構造
JP2012132380A (ja) * 2010-12-22 2012-07-12 Mitsubishi Heavy Ind Ltd 舶用低圧タービン車室
JP5669591B2 (ja) * 2011-01-21 2015-02-12 三菱重工業株式会社 蒸気タービン

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1483995A (en) * 1922-04-24 1924-02-19 Taylor Harvey Birchard Composite spiral casing
US3594095A (en) * 1968-12-03 1971-07-20 Siemens Ag Casing for low-pressure stages of steam turbines of completely welded multishell construction
US3915588A (en) * 1973-10-16 1975-10-28 Bbc Brown Boveri & Cie Two-shell axial-plane split casing structure for high-capacity low-pressure sections of a steam turbine
US3982849A (en) * 1974-12-16 1976-09-28 Bbc Brown Boveri & Company Limited Low pressure steam turbine construction
US4029432A (en) * 1974-11-18 1977-06-14 Bbc Brown Boveri & Company Limited Thermal turbomachine
US4900223A (en) * 1989-02-21 1990-02-13 Westinghouse Electric Corp Steam turbine
US5888318A (en) * 1994-07-06 1999-03-30 The Kansai Electric Power Co., Inc. Method of producing ferritic iron-base alloys and ferritic heat resistant steels

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CH524758A (de) * 1970-12-08 1972-06-30 Bbc Brown Boveri & Cie Mehrschaliges Turbinengehäuse für hohe Drücke und hohe Temperaturen
US4102598A (en) * 1975-11-11 1978-07-25 Westinghouse Electric Corp. Single case low pressure turbine
JPS5685502A (en) * 1979-12-15 1981-07-11 Kawasaki Heavy Ind Ltd Axial flow turbine
US4863341A (en) * 1988-05-13 1989-09-05 Westinghouse Electric Corp. Turbine having semi-isolated inlet
US4915581A (en) * 1989-01-03 1990-04-10 Westinghouse Electric Corp. Steam turbine with improved inner cylinder
US5104285A (en) * 1990-10-18 1992-04-14 Westinghouse Electric Corp. Low pressure inlet ring subassembly with integral staybars
DE19909056A1 (de) * 1999-03-02 2000-09-07 Abb Alstom Power Ch Ag Gehäuse für eine thermische Turbomaschine
JP2004100482A (ja) * 2002-09-05 2004-04-02 Mitsubishi Heavy Ind Ltd 低圧蒸気タービン
JP2007009820A (ja) * 2005-06-30 2007-01-18 Mitsubishi Heavy Ind Ltd タービン車室

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1483995A (en) * 1922-04-24 1924-02-19 Taylor Harvey Birchard Composite spiral casing
US3594095A (en) * 1968-12-03 1971-07-20 Siemens Ag Casing for low-pressure stages of steam turbines of completely welded multishell construction
US3915588A (en) * 1973-10-16 1975-10-28 Bbc Brown Boveri & Cie Two-shell axial-plane split casing structure for high-capacity low-pressure sections of a steam turbine
US4029432A (en) * 1974-11-18 1977-06-14 Bbc Brown Boveri & Company Limited Thermal turbomachine
US3982849A (en) * 1974-12-16 1976-09-28 Bbc Brown Boveri & Company Limited Low pressure steam turbine construction
US4900223A (en) * 1989-02-21 1990-02-13 Westinghouse Electric Corp Steam turbine
US5888318A (en) * 1994-07-06 1999-03-30 The Kansai Electric Power Co., Inc. Method of producing ferritic iron-base alloys and ferritic heat resistant steels

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
BLAIR, M., and MONROE, R. Cast or Forgings? A Realistic Evaluation. Steel Founders' Society of America[online], Engineered Casting Solutions, Spring 2000 [Retrieved on 2012-08-10]. Retrieved from the internet: *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9091181B2 (en) 2010-12-24 2015-07-28 Alstom Technology Ltd. Module for a steam turbine
US20120195752A1 (en) * 2011-02-01 2012-08-02 General Electric Company Stiffening system for steam turbine casing
EP2487336A1 (en) * 2011-02-11 2012-08-15 Alstom Technology Ltd Exhaust device for a steam turbine module
US9243516B2 (en) 2011-02-11 2016-01-26 Alstom Technology Ltd Exhaust device for a steam turbine module
US9447699B2 (en) 2011-07-15 2016-09-20 Siemens Aktiengesellschaft Steam turbine housing
US9683450B2 (en) 2013-03-13 2017-06-20 General Electric Company Turbine casing inlet assembly construction
US9605561B2 (en) 2013-03-13 2017-03-28 General Electric Company Modular turbomachine inlet assembly and related inlet transition section
US20170234162A1 (en) * 2016-02-17 2017-08-17 General Electric Technology Gmbh Steam turbine inner casing component and repair method therefor
CN107091126A (zh) * 2016-02-17 2017-08-25 通用电器技术有限公司 蒸汽涡轮内壳部件及其维修方法
US10619513B2 (en) * 2016-02-17 2020-04-14 General Electric Technology Gmbh Steam turbine inner casing component and repair method therefor
US20220220862A1 (en) * 2019-04-17 2022-07-14 General Electric Company Turbine casing component and repair method therefor
US11708770B2 (en) * 2019-04-17 2023-07-25 General Electric Company Turbine casing component and repair method therefor
CN114508392A (zh) * 2021-12-29 2022-05-17 东方电气集团东方汽轮机有限公司 一种汽轮机高压进汽室结构

Also Published As

Publication number Publication date
DE102008000284A1 (de) 2008-09-04
JP2008240725A (ja) 2008-10-09
CN101255802A (zh) 2008-09-03

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Owner name: ALSTOM TECHNOLOGY LTD, SWITZERLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LAGEDER, HEINRICH;LUKASIK, LUCJAN;GREIM, RALF;AND OTHERS;REEL/FRAME:020975/0791;SIGNING DATES FROM 20080429 TO 20080505

Owner name: ALSTOM TECHNOLOGY LTD, SWITZERLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LAGEDER, HEINRICH;LUKASIK, LUCJAN;GREIM, RALF;AND OTHERS;SIGNING DATES FROM 20080429 TO 20080505;REEL/FRAME:020975/0791

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION