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WO2018001651A1 - Ensemble turbine - Google Patents

Ensemble turbine Download PDF

Info

Publication number
WO2018001651A1
WO2018001651A1 PCT/EP2017/062745 EP2017062745W WO2018001651A1 WO 2018001651 A1 WO2018001651 A1 WO 2018001651A1 EP 2017062745 W EP2017062745 W EP 2017062745W WO 2018001651 A1 WO2018001651 A1 WO 2018001651A1
Authority
WO
WIPO (PCT)
Prior art keywords
casing
turbine
nozzle valve
blade carrier
valve casing
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.)
Ceased
Application number
PCT/EP2017/062745
Other languages
English (en)
Inventor
Libor Chroboczek
Peter Jankura
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
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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, Siemens Corp filed Critical Siemens AG
Publication of WO2018001651A1 publication Critical patent/WO2018001651A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F01D25/243—Flange connections; Bolting arrangements
    • 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
    • F01D25/246—Fastening of diaphragms or stator-rings
    • 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
    • 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 turbine assembly, in par ⁇ ticular to a steam turbine assembly. More particularly the present invention relates to a turbine assembly, for example a steam turbine assembly, including an outer turbine casing, a nozzle valve casing and a stator blade carrier.
  • Each stage of the turbine includes a row of stator blades which channel the hot steam into a corresponding row of rotor blades.
  • the stator blades extend radially inwardly from stator components of the turbine.
  • the rotor blades extend radially outwardly from a rotor of the turbine.
  • the flowing and the expansion of the steam through the turbine stages cause the rotation of the rotor blades and of the rotor itself around its axis.
  • the rotation of the rotor is the source of work which is usable as output for powering one or more devices which converts power.
  • the outer turbine casing of a steam turbine has an axis of symmetry, which is normally coincident with the axis of rotation of the rotor, and is constituted by a lower part and an upper part joined together by means of joining bolts at a splitting plane.
  • the splitting plane is
  • the turbine further comprises a nozzle valve casing and a stator blade carrier, which are fixed to the outer turbine casing for supporting, respectively, the plurality of nozzle blades and the plurality of stator blades.
  • the outer turbine casing, the nozzle valve casing and the stator blade carrier comprise respective lower half portions and upper half portions joined together at the horizontal splitting plane.
  • the nozzle valve casing and the stator blade carrier are fixed to the casing in such a way that :
  • the nozzle valve casing is coupled to at least a seat provided in the outer turbine casing.
  • stator blade carrier is attached to the nozzle valve casing, by means of a plurality of coupling bolts distributed around the central axis of symmetry of the rotor, and is also coupled to at least a second seat provided in the outer turbine casing.
  • a turbine comprising:
  • nozzle valve casing supporting the plurality of nozzle blades, the nozzle valve casing being fixed to the casing
  • stator blade carrier supporting the plurality of stator blades, the stator blade carrier being supported by the nozzle valve casing.
  • the casing comprises at least one seat to which the nozzle valve casing is coupled, the nozzle valve casing being interposed between the casing and the stator blade carrier in such a way that the casing and the stator blade carrier are separated from each other.
  • the above described turbine may be a steam turbine .
  • stator blade carrier no coupling between the stator blade carrier and the casing.
  • the stator blade carrier is in contact only with the nozzle valve casing, which is interposed between the casing and the stator blade carrier.
  • the nozzle valve casing and the stator blade carrier are distinct components, the stator comprising at least a fixing connection between the nozzle valve casing and the stator blade carrier.
  • the fixing connection may include a plurality of bolts or a welding.
  • this allows, with respect to known stators mean term, an easier manufacturing process of the nozzle valve casing and of the stator blade carrier.
  • the nozzle valve casing and the stator blade carrier are integrated in a single component.
  • nozzle valve casing and the stator blade carrier may be obtained through casting of a single
  • this permits to avoid the use of connecting means between the nozzle valve casing and the stator blade carrier .
  • the casing comprises at least two seats to which the nozzle valve casing is coupled, for example by a forced coupling .
  • this permits to further improve the stiffness and strength of the stator assembly and to further facilitate the assembly of the with the nozzle valve casing and of the stator blade carrier to the outer turbine casing.
  • Fig. 1 is a partial sectional view of a first embodiment of a steam turbine according to the present invention
  • FIG. 2 is a partial sectional view of a second embodiment of a steam turbine according to the present invention. Detailed Description
  • FIG. 1 shows an example of a steam turbine 1 in a vertical sectional view.
  • the steam turbine 1 comprises an outer casing 12 and rotor 13, having a common axis of symmetry Y, also coincident with the rotational axis of the rotor 13. Both the turbine outer casing 12 and the rotor 13 are partially represented in Fig. 1.
  • the rotor 13 comprises a plurality of rows of rotor blades 19.
  • the rotor blades 19 extend radially outwardly from the rotor 13 of the steam turbine 1. In each row, which
  • the rotor blades 19 are regularly distributed around the
  • the outer turbine casing 12 is constituted by a first lower portion and a second upper portion (only the latter is represented in the attached figures) .
  • Each of the lower and upper portions of the casing 12 extends circumferentially for angle of 180° around the rotational axis Y and are joined together, by means of joining bolts (not represented in the attached figures) , at an intermediate horizontal splitting plane (in the attached figures the dot-dashed line Y also represent the trace of the horizontal splitting plane) .
  • the outer casing 12 comprises an external surface 12a, towards the external environment, an internal surface 12b towards the rotational axis Y.
  • the outer casing 12 extends radially between a first axial end 11a and a second axial end lib. Inside the casing, steam flows mainly according to an axial direction oriented from the first axial end 11a towards second axial end lib.
  • upstream and downstream refer to the flow direction of the steam flow through the casing 12 of the turbine 1, unless otherwise stated.
  • the turbine 1 further comprises a nozzle valve casing 14 for supporting a plurality of nozzle blades 16. Through the nozzle blades 16, the flow of steam is channelled towards a plurality of stages of the steam turbine 1. Each stage of the steam turbine 1 comprises a row of stator blades 18 which channel the hot steam into a corresponding row of the rotor blades 19.
  • the plurality of nozzle blades 16 are connected to the nozzle valve casing 14 by means of a nozzle ring 26.
  • the nozzle ring 26 is radially supported by a wheel 27 fixed to the rotor 13.
  • the plurality nozzle blades 16, the nozzle ring 26 and the connections between the nozzle ring 26 and the nozzle valve casing 14 and between the nozzle ring 26 and the wheel 27 are not described in further detail, as they are conventional and do not form specific part of the present invention.
  • the nozzle valve casing 14 is fixed to the outer casing 12.
  • at least one seat in the casing is provided.
  • a first upstream seat 23 is provided as a circumferential cylindrical groove to be coupled, for example by means of a forced coupling, to a correspondent cylindrical surface 14a of the nozzle valve casing 14.
  • a second downstream seat 24, axially adjacent to the first upstream seat 23, is provided as a circumferential surface at the radial end of an annular protrusion 34 extending radially inward from the internal surface 12b of the casing 12 towards the rotational axis Y.
  • the second downstream seat 24 is coupled, for example by means of a forced coupling, to a correspondent
  • the turbine 1 further comprises a stator blade carrier 22 supporting the plurality of stator blades 18.
  • the stator blades 18 are distributed into a plurality of rows of stator blades 18, one for each of the stages of the steam turbine 1.
  • the stator blades 18 extend radially inwardly from the stator blade carrier 22 and are regularly distributed around the rotational axis Y. In each stage of the steam turbine 1, a row of stator blades 18 are axially upstream a corresponding row of rotor blades 19.
  • the stator blade carrier 22 is supported by the nozzle valve casing 14.
  • the nozzle valve casing 14 is interposed between the casing 12 and the stator blade carrier 22 in such a way that the casing 12 and the stator blade carrier 22 are separated from each other, i.e. no seat is provided in the casing 12 for coupling with the stator blade carrier 22.
  • the nozzle valve casing 14 and the stator blade carrier 22 are connected in series between the casing 12 and the stator blades 18.
  • the nozzle valve casing 14 and the stator blade carrier 22 are distinct components.
  • the turbine 1 comprises a plurality of bolts, parallel to the rotational axis Y and circumferentially distributed around the rotational axis Y.
  • the length of the bolts 25 are long enough to assure the connection between the nozzle valve casing 14 and the stator blade carrier 22 and are considerably shorter than in other known-in-the-art application where bolts are provided to couple the stator blade carrier 22 to the nozzle valve casing 14 and at the same time to the casing 12 of the turbine.
  • connections may be provided between the stator blade carrier 22 and the nozzle valve casing 14, for example a welding.
  • the nozzle valve casing 14 and the stator blade carrier 22 are integrated in a single component 15.
  • such single component may be obtained through casting.
  • the stator blade carrier 22 is identified as the portion of the single component 15 which is downstream of the nozzle valve casing 14 and of the annular protrusion 34.
  • stator blade carrier 22 has not direct connection to the outer casing 12 of the turbine 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

Une turbine (1) comprend :-un carter extérieur (12), -une pluralité d'aubes d'injecteur (16),-une pluralité d'aubes de stator (18),-un carter de soupape d'injecteur (14) supportant la pluralité d'aubes d'injecteur (16). Le carter de soupape d'injecteur (14) est fixé au carter (12), un support (22) soutenant la pluralité d'aubes de stator (18) est porté par le carter de vanne buse (14). Le carter (12) comprend au moins un siège (23, 24) auquel le carter de soupape d'injecteur (14) est accouplé. Le carter de soupape d'injecteur (14) est intercalé entre le carter (12) et le support d'aubes de stator (22) de façon que le carter (12) et le support d'aubes de stator (22) soient séparés l'un de l'autre.
PCT/EP2017/062745 2016-07-01 2017-05-26 Ensemble turbine Ceased WO2018001651A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16177535.8A EP3263851B1 (fr) 2016-07-01 2016-07-01 Ensemble de turbine
EP16177535.8 2016-07-01

Publications (1)

Publication Number Publication Date
WO2018001651A1 true WO2018001651A1 (fr) 2018-01-04

Family

ID=56292604

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2017/062745 Ceased WO2018001651A1 (fr) 2016-07-01 2017-05-26 Ensemble turbine

Country Status (2)

Country Link
EP (1) EP3263851B1 (fr)
WO (1) WO2018001651A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2076065A (en) * 1980-05-20 1981-11-25 Forster Terence Owen Turbine
EP1098070A1 (fr) * 1999-10-29 2001-05-09 Mitsubishi Heavy Industries, Ltd. Turbine à vapeur à refroidissement amélioré de la carcasse d'enveloppe
US20140334925A1 (en) * 2013-05-10 2014-11-13 General Electric Company System for supporting a turbine nozzle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2076065A (en) * 1980-05-20 1981-11-25 Forster Terence Owen Turbine
EP1098070A1 (fr) * 1999-10-29 2001-05-09 Mitsubishi Heavy Industries, Ltd. Turbine à vapeur à refroidissement amélioré de la carcasse d'enveloppe
US20140334925A1 (en) * 2013-05-10 2014-11-13 General Electric Company System for supporting a turbine nozzle

Also Published As

Publication number Publication date
EP3263851B1 (fr) 2018-10-17
EP3263851A1 (fr) 2018-01-03

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