EP2576998B1 - Dampfturbineneinheit und Verfahren zur Montage einer Dampfturbine - Google Patents

Dampfturbineneinheit und Verfahren zur Montage einer Dampfturbine Download PDF

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Publication number
EP2576998B1
EP2576998B1 EP11723933.5A EP11723933A EP2576998B1 EP 2576998 B1 EP2576998 B1 EP 2576998B1 EP 11723933 A EP11723933 A EP 11723933A EP 2576998 B1 EP2576998 B1 EP 2576998B1
Authority
EP
European Patent Office
Prior art keywords
inner casing
stationary blade
guide blade
blade carrier
blade ring
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.)
Not-in-force
Application number
EP11723933.5A
Other languages
English (en)
French (fr)
Other versions
EP2576998A1 (de
Inventor
Gaurav Bajaj
Sukesh Kakar
Dipankar Sen
Kamaljeet Singh
Vikas Tiwari
Raman Sharma
Indranil Acharya
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 EP11723933.5A priority Critical patent/EP2576998B1/de
Publication of EP2576998A1 publication Critical patent/EP2576998A1/de
Application granted granted Critical
Publication of EP2576998B1 publication Critical patent/EP2576998B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01D25/246—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
    • 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
    • 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
    • F05D2230/64—Assembly methods using positioning or alignment devices for aligning or centring, e.g. pins
    • F05D2230/642—Assembly methods using positioning or alignment devices for aligning or centring, e.g. pins using maintaining alignment while permitting differential dilatation
    • 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
    • F05D2230/64—Assembly methods using positioning or alignment devices for aligning or centring, e.g. pins
    • F05D2230/644—Assembly methods using positioning or alignment devices for aligning or centring, e.g. pins for adjusting the position or the alignment, e.g. wedges or eccenters
    • 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
    • F05D2250/00—Geometry
    • F05D2250/20—Three-dimensional
    • F05D2250/29—Three-dimensional machined; miscellaneous
    • F05D2250/292—Three-dimensional machined; miscellaneous tapered

Definitions

  • the present invention relates to steam turbines, used, for example, in power generation.
  • the present invention relates to assembly of such a steam turbine.
  • a steam turbine conventionally includes an outer casing and an inner casing arranged therein. Inside the inner casing is mounted one or more stationary blade rings and guide blade carriers. Guide blade carriers are normally placed in the regions having high steam temperature and pressure whereas stationary blade rings are placed after in the regions having relatively lower steam temperature and pressure. Guide blade carriers are typically formed by casting wherein stationary blades are assembled in the guide blade carrier via grooves machined in the inner diameter of the guide blade carrier. Stationary blade rings are normally fabricated wherein the stationary blades are welded in the inner diameter of stationary blade rings.
  • Each Stationary blade ring or guide blade carrier On each Stationary blade ring or guide blade carrier are mounted one or more rows of guide blades axially separated from each other.
  • Each guide blade row includes several guide blades arranged next to each other in a circumferential direction.
  • transverse fixing of the inner casing to the components within, such as guide blade carriers or stationary blade ring are done by using flat faced fixing keys or liners.
  • the thicknesses of the keys or liners are adjusted by machining on site based on the available space for fitment of the keys or liners as measured at the site. This adjustment of thickness of the keys by machining on site is required for proper fastening of these components each time the steam turbine needs to be reassembled following an overhaul, outage or upgrade.
  • the object of the present invention is the overcome the above-mentioned disadvantages of the state of the art, in particular, to obviate the need for machining the fixing keys on site every time during assembly of a steam turbine.
  • the underlying idea of the present invention is to provide transverse fixing of the guide blade carrier or stationary blade ring to the inner casing in a steam turbine using tapered keys having varying thickness fitted therebetween.
  • the guide blade carrier or stationary blade ring comprises a radially outward arm supported between a pair of transversely separated support faces of said inner casing.
  • a pair of keys are slidably fitted respectively between the arm and each of the support faces, for transversely fastening said guide blade carrier or stationary blade ring to said inner casing.
  • An essential feature of the present invention is that each said key is tapered to have a varying thickness between said radial arm and the respective support face.
  • An advantage of the present invention is that it provides easy assembly of the turbine by eliminating the need for on the site machining of the surface of the keys to adjust the thickness prior to assembly of the steam turbine.
  • a second advantage of the present invention is that the use of tapered keys provides improved alignment of such components.
  • each of the support faces of the inner casing is correspondingly tapered to interface with a respective tapered surface of each of the keys.
  • vertical adjustment is provided by the use of shims in the vertical gap between a transverse portion of the keys and a corresponding transverse surface of the inner casing, which vertical gap resulting from the fitting of the keys between the inner casing and the guide blade carrier or stationary blade ring.
  • FIG. 1 a longitudinal cross-section from the top of a low pressure steam turbine assembly 1 where the present invention finds an exemplary application.
  • the steam turbine assembly 1 includes an outer casing 2, enclosing an inner casing 3 arranged around a rotor 6 having a longitudinal axis 4 along a horizontal direction Y-Y.
  • the inner casing 3 and rotor 6 form an annular steam flow path between themselves, the inner casing 3 forming the outer periphery of the flow path.
  • a plurality of stationary guide blades 7 and rotating blades 8 are arranged in alternate rows interspaced axially.
  • Each row of moving blades includes a plurality of blades 8 affixed to the rotor 6 and arranged side by side in a circumferential direction, each blade having an airfoil portion extending radially outward from the rotor 6 into the steam flow path.
  • Each row of guide blades includes a plurality of guide blades 7 arranged side by side in a circumferential direction on a stationary blade ring or guide blade carrier or stationary blade ring 5 that is affixed to the inner casing 3.
  • Each stationary guide blade 7 has an airfoil portion extending radially inwardly from the guide blade carrier or stationary blade ring 5 into the steam flow path.
  • the present invention provides a means for fastening the blade carrier or stationary blade ring 5 to the inner casing 3 in the transverse direction X-X.
  • An exemplary arrangement for transverse fastening of the guide blade carrier or stationary blade ring 5 to the inner casing 3 is shown in FIG 2 , which shows a simplified cross-sectional view through the section A-A in FIG 1 .
  • the inner casing 3 and the guide blade carrier or stationary blade ring 5 are each made of an upper half and a lower half affixed to each other.
  • FIG 2 only the lower halves of the inner casing 3 and the guide blade carrier or stationary blade ring 5 are shown, wherein the essential features of the present invention are incorporated.
  • the guide blade carrier or stationary blade ring 5 i.e., the lower half thereof, includes a radial arm 10.
  • the radial arm 10 of the guide blade carrier or stationary blade ring 5 is supported between the faces 11a and 11b of the inner casing 3.
  • a pair of keys 13a and 13b are inserted on opposite sides of the radial arm 10, between the arm 10 and the respective support face 11a and 11b.
  • each of the keys 13a and 13b is tapered to have a varying thickness between the radial arm 10 and the respective support faces 11a and 11b
  • each of the keys 13a and 13b includes a tapered surface 14a and 14b.
  • the support faces 11a and 11b are machined to have a corresponding taper that interfaces with the surfaces 14a and 14b of the keys 13a and 1b respectively.
  • the assembly method includes positioning the guide blade carrier or stationary blade ring 5 within the inner casing 3 such that the radial arm 10 of the guide blade carrier or stationary blade ring 5 extends between the support faces 11a and 11b.
  • the keys 13a and 13b are then vertically inserted into the spaces between the arm 10 and the support faces 11a and 11b, such that the surfaces 14a and 14b slide over the surfaces 12a and 12b till a tight fit is obtained, whereby the guide blade carrier or stationary blade ring 5 is locked or fastened in the transverse direction X-X.
  • the above method of fastening obviates the need for machining the surfaces of the keys for providing the required clearance with the guide blade carrier or stationary blade ring each time during assembly or reassembly, for example, following an overhaul, outage or upgrade of the steam turbine. Further using tapered keys of the above type provides a better transverse alignment of the guide blade carrier or stationary blade ring with respect to the inner casing.
  • each of the keys 13a and 13b includes a transverse arm 15a and 15b which is supported over a respective transverse surface 12a and 12b on the inner casing.
  • the keys 13a and 13b are inserted to the required extent to obtain the necessary clearance.
  • a pair of shims 16a,16b are inserted into the resultant vertical gaps 18a and 18b between the transverse arms 15a,15b and the surfaces 12a,12b after the fitment of the keys.
  • the shims 16a and 16b are fastened by bolts 17a and 18b, to provide fastening in the vertical direction Z-Z.
  • the vertical gaps 18a and 18b may vary in thickness from assembly to assembly. Accordingly, shims of a required thickness may be inserted into these gaps to provide vertical adjustment to the assembly. Such a practice is less time consuming and more economical than the process of machining the surface of the flat keys for each assembly.

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

Claims (6)

  1. Dampfturbinenanordnung (1), die Folgendes umfasst:
    - ein Innengehäuse (3), das um eine longitudinale Rotorachse (4) angeordnet ist,
    - einen Leitschaufelträger oder stationären Schaufelring (5), der in dem Innengehäuse (3) in Umfangsrichtung um die Rotorachse (4) angeordnet ist, wobei der Leitschaufelträger oder stationäre Schaufelring (5) einen radial auswärts gerichteten Arm (10) aufweist, der zwischen einem Paar in Querrichtung getrennter Unterstützungsoberflächen (11a, 11b) des Innengehäuses (3) unterstützt ist, und
    - ein Paar Keile (13a, 13b), die gleitend zwischen den radialen Arm (10) und jede der Unterstützungsflächen (11a, 11b) eingepasst sind, um den Gleitschaufelträger oder stationären Schaufelring (5) an dem Innengehäuse (3) in Querrichtung zu befestigen, dadurch gekennzeichnet, dass jeder Keil (13a, 13b) konisch zuläuft, so dass er zwischen dem radialen Arm (10) und der jeweiligen Unterstützungsfläche (11a, 11b) eine veränderliche Dicke besitzt,
    wobei jede der Unterstützungsflächen (11a, 11b) des Innengehäuses (3) entsprechend konisch zuläuft, um mit einer entsprechenden konisch zulaufenden Oberfläche (14a, 14b) jedes der Keile (13a, 13b) eine Grenzfläche zu bilden.
  2. Dampfturbinenanordnung (1) nach Anspruch 1, wobei jeder der Keile (13a, 13b) ferner einen Querarm (15a, 15b) umfasst, der über einer entsprechenden Queroberfläche (12a, 12b) des Innengehäuses (3) unterstützt ist, und wobei in einem vertikalen Spalt (18a, 18b) zwischen dem Querarm (16a, 16b) jedes Keils (13a, 13b) und der entsprechenden Queroberfläche (12a, 12b) des Innengehäuses (3) ein Abstandshalter (16a, 16b) angeordnet ist, wobei sich der vertikale Spalt (18a, 18b) aus der gleitenden Einpassung des Keils (13a, 13b) ergibt.
  3. Dampfturbinenanordnung (1) nach einem der vorhergehenden Ansprüche, wobei
    - das Innengehäuse (3) eine obere Hälfte des Innengehäuses und eine untere Hälfte des Innengehäuses umfasst und das Paar Unterstützungsflächen (11a, 11b) an der unteren Hälfte des Innengehäuses vorgesehen ist und
    - der Leitschaufelträger oder stationäre Schaufelring (5) eine obere Hälfte des Leitschaufelträgers oder stationären Schaufelrings und eine untere Hälfte des Leitschaufelträgers oder stationären Schaufelrings umfasst und der radiale Arm (10) an der unteren Hälfte des Leitschaufelträgers oder stationären Schaufelrings vorgesehen ist.
  4. Verfahren zum Montieren einer Dampfturbine (1), das Folgendes umfasst:
    - Anordnen eines Innengehäuses (3) um eine longitudinale Rotorachse (4),
    - Anordnen eines Leitschaufelträgers oder stationären Schaufelträgers (5) in dem Innengehäuse (3) in Umfangsrichtung um die Rotorachse (4), wobei das Anordnen des Leitschaufelträgers oder stationären Schaufelrings (5) das Positionieren eines radial nach außen gerichteten Arms (10) des Leitschaufelträgers oder stationären Schaufelrings (5) zwischen einem Paar in Querrichtung getrennter Unterstützungsflächen (11a, 11b) des Innengehäuses (3) umfasst,
    - gleitendes Einpassen eines Paars Keile (13a, 13b) zwischen den radialen Arm (10) und jede der Unterstützungsflächen (11a, 11b), um den Leitschaufelträger oder stationären Schaufelring (5) an dem Innengehäuse (3) in Querrichtung zu befestigen,
    dadurch gekennzeichnet, dass jeder Keil (13a, 13b) konisch zuläuft, damit er zwischen dem radialen Arm (10) und der jeweiligen Unterstützungsfläche (11a, 11b) eine veränderliche Dicke besitzt,
    wobei jede der Unterstützungsflächen (11a, 11b) des Innengehäuses (3) entsprechend konisch zuläuft, um mit einer entsprechenden konischen Oberfläche (14a, 14b) jedes der Keile (13a, 13b) eine Grenzfläche zu bilden.
  5. Verfahren nach Anspruch 4,
    wobei jeder der Keile (13a, 13b) ferner einen Querarm (15a, 15b) umfasst, der über einer entsprechenden Queroberfläche (12a, 12b) des Innengehäuses (3) unterstützt ist, wobei das Verfahren ferner das Anordnen eines Abstandshalters (16a, 16b) in einem vertikalen Spalt (18a, 18b) zwischen dem Querarm (15a, 15b) jedes Keils (13a, 13b) und der entsprechenden Queroberfläche (12a, 12b) des Innengehäuses (3) umfasst, wobei sich der vertikale Spalt (18a, 18b) aus der Gleiteinpassung des Keils (13a, 13b) ergibt.
  6. Verfahren nach Anspruch 4 oder 5, wobei
    - das Anordnen des Innengehäuses (3) das Anordnen einer oberen Hälfte des Innengehäuses und einer unteren Hälfte des Innengehäuses umfasst, wobei das Paar Unterstützungsflächen (11a, 11b) an der unteren Hälfte des Innengehäuses vorgesehen wird und
    - das Anordnen des Leitschaufelträgers oder des stationären Schaufelträgers (5) das Anordnen einer oberen Hälfte des Leitschaufelträgers oder stationären Schaufelrings und einer unteren Hälfte des Leitschaufelträgers oder stationären Schaufelrings umfasst und wobei der radiale Arm (10) an der unteren Hälfte des Leitschaufelträgers oder stationären Schaufelrings vorgesehen ist.
EP11723933.5A 2010-06-04 2011-05-31 Dampfturbineneinheit und Verfahren zur Montage einer Dampfturbine Not-in-force EP2576998B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11723933.5A EP2576998B1 (de) 2010-06-04 2011-05-31 Dampfturbineneinheit und Verfahren zur Montage einer Dampfturbine

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP10005811A EP2392784A1 (de) 2010-06-04 2010-06-04 Dampfturbineneinheit und Verfahren zur Montage einer Dampfturbine
PCT/EP2011/058955 WO2011151329A1 (en) 2010-06-04 2011-05-31 Steam turbine assembly and method of assembling a steam turbine
EP11723933.5A EP2576998B1 (de) 2010-06-04 2011-05-31 Dampfturbineneinheit und Verfahren zur Montage einer Dampfturbine

Publications (2)

Publication Number Publication Date
EP2576998A1 EP2576998A1 (de) 2013-04-10
EP2576998B1 true EP2576998B1 (de) 2014-06-25

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EP10005811A Withdrawn EP2392784A1 (de) 2010-06-04 2010-06-04 Dampfturbineneinheit und Verfahren zur Montage einer Dampfturbine
EP11723933.5A Not-in-force EP2576998B1 (de) 2010-06-04 2011-05-31 Dampfturbineneinheit und Verfahren zur Montage einer Dampfturbine

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Application Number Title Priority Date Filing Date
EP10005811A Withdrawn EP2392784A1 (de) 2010-06-04 2010-06-04 Dampfturbineneinheit und Verfahren zur Montage einer Dampfturbine

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EP (2) EP2392784A1 (de)
CN (1) CN102933800B (de)
WO (1) WO2011151329A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120009058A1 (en) * 2010-07-09 2012-01-12 General Electric Company Compressible supports for turbine engines
WO2015156692A1 (en) * 2014-04-11 2015-10-15 General Electric Company Adjustable wedge-shaped shim for an exhaust frame assembly of a turbomachine
EP3299591B1 (de) 2016-09-27 2019-12-18 Siemens Aktiengesellschaft Leitschaufelträger, turbinengehäuse und turbine
CN106988794B (zh) * 2017-06-02 2018-12-14 中国航发南方工业有限公司 静子组合件夹紧方法及静子组合件

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB846918A (en) * 1957-01-11 1960-09-07 Power Jets Res & Dev Ltd Shroud ring for an axial-flow compressor or turbine
CH589799A5 (de) * 1975-07-04 1977-07-15 Bbc Brown Boveri & Cie
CH664191A5 (de) * 1984-01-09 1988-02-15 Bbc Brown Boveri & Cie Von aussen zustellbare axialfixierung eines schaufeltraegers in einer turbine.
US6722846B2 (en) * 2002-07-30 2004-04-20 General Electric Company Endface gap sealing of steam turbine bucket tip static seal segments and retrofitting thereof
US7419355B2 (en) * 2006-02-15 2008-09-02 General Electric Company Methods and apparatus for nozzle carrier with trapped shim adjustment
US8070431B2 (en) * 2007-10-31 2011-12-06 General Electric Company Fully contained retention pin for a turbine nozzle
US8186947B2 (en) * 2008-09-16 2012-05-29 Honeywell International Inc. Conical pin to maintain bearing system
US8047779B2 (en) * 2008-10-23 2011-11-01 General Electric Company Combined axial and transverse constraint and alignment system and method for rotary machines

Also Published As

Publication number Publication date
WO2011151329A1 (en) 2011-12-08
EP2576998A1 (de) 2013-04-10
EP2392784A1 (de) 2011-12-07
CN102933800A (zh) 2013-02-13
CN102933800B (zh) 2015-02-25

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