EP2653663A2 - Joint pour système de turbine - Google Patents

Joint pour système de turbine Download PDF

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Publication number
EP2653663A2
EP2653663A2 EP13163564.1A EP13163564A EP2653663A2 EP 2653663 A2 EP2653663 A2 EP 2653663A2 EP 13163564 A EP13163564 A EP 13163564A EP 2653663 A2 EP2653663 A2 EP 2653663A2
Authority
EP
European Patent Office
Prior art keywords
seal
rotor
tip strip
end portion
packing head
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Withdrawn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
EP13163564.1A
Other languages
German (de)
English (en)
Inventor
Bhaskar Ram
Kevin Joseph Barb
Srinivas Pakkala
Kunal Sakekar Upendra
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 Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of EP2653663A2 publication Critical patent/EP2653663A2/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Withdrawn legal-status Critical Current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
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/001—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between stator blade and rotor

Definitions

  • the subject matter disclosed herein relates generally to turbine systems, and more particularly to a seal for such turbine systems.
  • Turbine systems such as steam turbine systems, for example, often include different sections that operate at various pressures, including a high pressure (HP) section and an intermediate pressure (IP) section, each housing a portion of a rotor.
  • HP high pressure
  • IP intermediate pressure
  • a cooling source it is common for a cooling source to be introduced to the area of the IP section proximate the rotor, in order to maintain the temperature of the rotor below the temperature of the general IP section.
  • Failure to achieve maintenance of the rotor surface at a cooler temperature results in a need to reduce the rotor diameter design, but the reduced diameter negatively impacts overall steam turbine system performance.
  • a seal for a turbine system includes a rotor, a bowl region and a stator assembly having a tip strip disposed proximate the rotor. Also included is a packing head disposed proximate the tip strip. Further included is a flex seal having a first end portion fixedly secured to at least one of the tip strip and the packing head, with a second end portion slidably engaged with at least one of the tip strip and the packing head.
  • a seal for a steam turbine system includes a rotor, a bowl region and a stator assembly including a stator tip strip, wherein the stator tip strip is disposed proximate the rotor. Also included is a first steam source injected into the bowl region at a first temperature. Further included is a packing head disposed proximate the stator tip strip. Yet further included is a rotor cooling steam source injected at a second temperature along a path in close proximity to the rotor, wherein the second temperature is lower than the first temperature.
  • a flex seal having a fixed portion and a free portion, wherein the flex seal is fixedly coupled at the fixed portion to at least one of the stator assembly, the packing head and the stator tip strip, wherein the flex seal prevents the first steam source from entering the path in close proximity to the rotor.
  • a seal for a steam turbine system includes an intermediate pressure section having a rotor, a bowl region, an outer casing and a stator assembly having a tip strip disposed proximate the rotor, wherein the intermediate pressure section comprises an axial direction corresponding to a longitudinal direction of the rotor and a radial direction extending relatively from the rotor to the outer casing. Also included is a packing head disposed proximate the tip strip.
  • a flex seal having a first end portion fixedly secured to at least one of the tip strip and the packing head, with a second end portion slidably engaged with at least one of the tip strip and the packing head and configured to be displaced in the axial direction and the radial direction.
  • the steam turbine system 10 includes a high pressure (HP) section 12 and an intermediate pressure (IP) section 14, with the HP section 12 being defined by an HP casing 16, and similarly the IP section 14 being defined by an IP casing 18.
  • HP high pressure
  • IP intermediate pressure
  • a central section 20 disposed between the HP section 12 and the IP section 14 includes a high pressure steam inlet 22 and an intermediate pressure steam inlet 24.
  • An annular section divider 26 extends radially inwardly from the central section 20 towards a rotor 28 that extends between the HP section 12 and the IP section 14. More specifically, the annular section divider 26 extends circumferentially around a portion of the rotor 28 between an HP section inlet nozzle 30 and an IP section inlet nozzle 32.
  • the annular section divider 26 has a packing structure 50 annularly fitted close to the rotor 28.
  • the high pressure steam inlet 22 receives high pressure, high temperature steam from a steam source, such as a boiler (not illustrated), for example.
  • Steam is routed through the HP section 12 from the first HP section inlet nozzle 30, from which work is extracted from the steam to mechanically rotate the rotor 28 via a plurality of turbine blades 27, or buckets (shown in FIG. 2 ) which are operably coupled to the rotor 28.
  • Each set of buckets includes a corresponding stator 29 (shown in FIG. 2 ) that facilitates routing of steam to the associated buckets.
  • the steam exits the HP section 12 and is returned to the boiler, where the steam is then reheated.
  • the reheated steam is then routed to the intermediate pressure steam inlet 24 and returned to the IP section 14 via the IP section inlet nozzle 32 at a reduced pressure than steam entering the HP section 12, but at a temperature that is approximately equal to the temperature of the steam entering the HP section 12.
  • Work is extracted from the steam in the IP section 14 in a similar manner as that employed for the HP section 12 via a system of rotating and stationary components. Accordingly, an operating pressure within the HP section 12 is higher than an operating pressure within the IP section 14, such that steam within the HP section 12 tends to flow towards the IP section 14 through leakage paths that may develop between the HP section 12 and the IP section 14.
  • the steam turbine system 10 has been described as an opposed-flow high pressure and intermediate pressure steam turbine combination, it is to be appreciated that the steam turbine system 10 may be employed with any individual turbine including, but not limited to, low pressure turbines. Additionally, the steam turbine system 10 is not limited to being configured as an opposed-flow steam turbine, but may instead be configured as a single-flow or double-flow steam turbine system, for example. Moreover, it is contemplated that embodiments disclosed herein may be used in conjunction with gas turbine systems as well.
  • the IP section 14 includes an IP bowl 40 proximate the IP section inlet nozzle 32, wherein a stream 42 of high temperature, intermediate pressure steam is injected into the IP bowl 40 for routing through the IP section 14, as described above.
  • the stator 29 within the IP section 14 is operably connected at a radially outward position to the IP casing 18 and includes a tip strip 46 that is disposed proximate the rotor 28. Adjacent to, and in close proximity with, the tip strip 46 of the stator 29 is a packing head 48 of the packing structure 50 disposed between the HP section 12 and the IP section 14.
  • a cooling source may be introduced proximate the rotor 28.
  • a cooling source may comprise a leaked flow 52 from the HP section 12 that has leaked across the N2 packing structure 50.
  • the leaked flow 52 that comprises high pressure steam from the HP section 12 naturally tends to flow in the direction of the lower pressure IP section 14.
  • the temperature of the leaked flow 52 decreases, thereby providing a cooler flow to the rotor 28 than would otherwise be felt by the rotor 28 as a result of heat transfer stemming from the stream 42 generally flowing through the IP section 14.
  • the cooling source has been described as the leaked flow 52 from the HP section 12 across the N2 packing structure 50, however, various alternative cooling sources may be employed to maintain the temperature of the rotor 28 below that of the general IP section 14.
  • a gap 54 between the packing head 48 and the tip strip 46 of the stator 29 is present. Unsealed, the gap 54 may result in a direct path of the stream 42, which may have a varying temperature of about 1,100°F, toward the rotor 28. Additionally, mixing of the stream 42 with a cooling source, such as the leaked flow 52, hinders the efficiency of the rotor cooling effort.
  • a flex seal 60 is disposed within the gap 54.
  • the flex seal 60 includes a first end portion 62 and a second end portion 64, with one of the first end portion 62 or the second end portion 64 being operably coupled to the tip strip 46, or more generally the stator 29, or the packing head 48.
  • the end not operably coupled to an object that being either the first end portion 62 or the second end portion 64 is fittingly engaged with either the tip strip 46 or the packing head 48 and relatively free to displace.
  • the other end is fittingly engaged with the other object, specifically the tip strip 46 or the packing head 48.
  • the ability of the first end portion 62 or the second end portion 64 to displace is based on the tendency of stator components, such as the tip strip 46 and the packing head 48 to displace in an axial and/or a radial direction during operation of the steam turbine system 10. Therefore, tight seals having a pressure fit at both the first end portion 62 and the second end portion 64 or an operable connection at the first end portion 62 and the second end portion 64 are not adequately held within the gap 54.
  • the allowance of the flex seal 60 to displace proximate at least one end in correspondence with an associated structure, such as the tip strip 46 or the packing head 48 maintains a robust seal of the gap 54, while accommodating the axial and/or radial displacement of the tip strip 46 or the packing head 48.
  • FIGS. 3-6 enlarged views of various embodiments of the flex seal 60 are illustrated. It is to be appreciated that the geometries of the flex seal 60 shown are merely illustrative, and are not limiting, as numerous geometric variations of the flex seal 60 are contemplated. Irrespective of the specific geometry employed for the flex seal 60, included is the first end portion 62 and the second end portion 64, with each being disposed in contact with the tip strip 46 and the packing head 48, respectively. As previously described, only one end of the flex seal 60 is operably coupled to one of the tip strip 46 and the packing head 48.
  • the first end portion 62 may be operably coupled to the tip strip 46 via mechanical fastening, such as bolting, riveting, or welding.
  • mechanical fastening such as bolting, riveting, or welding.
  • any suitable fastener may be employed to ensure retention of the first end portion 62 to the tip strip 46.
  • the second end portion 64 is in fitting engagement with the packing head 48, yet not operably coupled in a fixed manner, such that displacement may be achieved during axial and/or radial displacement of the tip strip 46 and/or the packing head 48. Adequate sealing and engagement of the second end portion 64 with the packing head 48 is achieved by pre-pressurizing the flex seal 60 to maintain sealing during even relatively large displacements.
  • the various embodiments of the flex seal 60 are illustrated and may be characterized as "Y-shaped" ( FIG. 3 ), "S-shaped” ( FIG. 4 ), or variations thereof ( FIGS. 5 and 6 ). While described as having the first end portion 62 and the second end portion 64 that are either operably coupled or in fitting engagement with the associated structural components, it is to be appreciated that the end is not necessarily the portion that requires such a connection. As seen in FIG. 6 , for example, the second end portion 64 is not disposed in contact with the packing head 48, and as such it may be another portion of the flex seal 60 that provides the operable connection or the fitting engagement. As described above, the illustrated embodiments of the flex seal 60 are merely examples of the numerous contemplated configurations that may be employed to prevent the high temperature steam, in the form of the stream 42, from intruding the rotor area through the gap 54.
  • the flex seal 60 prevents the high temperature steam routing through the IP section 14 from being imposed on the surface of the rotor 28, while maintaining adequate structural integrity at seal contact points.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Sealing Devices (AREA)
EP13163564.1A 2012-04-19 2013-04-12 Joint pour système de turbine Withdrawn EP2653663A2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13/451,126 US20130280048A1 (en) 2012-04-19 2012-04-19 Seal for a turbine system

Publications (1)

Publication Number Publication Date
EP2653663A2 true EP2653663A2 (fr) 2013-10-23

Family

ID=48139743

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13163564.1A Withdrawn EP2653663A2 (fr) 2012-04-19 2013-04-12 Joint pour système de turbine

Country Status (5)

Country Link
US (1) US20130280048A1 (fr)
EP (1) EP2653663A2 (fr)
JP (1) JP2013224657A (fr)
CN (1) CN103375194B (fr)
RU (1) RU2013117914A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015152742A1 (fr) * 2014-04-02 2015-10-08 General Electric Company Appareil et procédé permettant d'assurer l'étanchéité d'un ensemble turbine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10082085B2 (en) * 2013-12-17 2018-09-25 Rolls-Royce North American Technologies Inc. Seal for gas turbine engines
EP3333372A1 (fr) * 2016-12-09 2018-06-13 General Electric Technology GmbH Turbine, turbine à vapeur et procédé d'exploitation associés

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4318668A (en) * 1979-11-01 1982-03-09 United Technologies Corporation Seal means for a gas turbine engine
DE3310396A1 (de) * 1983-03-18 1984-09-20 Kraftwerk Union AG, 4330 Mülheim Md-dampfturbine in einflutiger bauweise fuer eine hochtemperaturdampfturbinenanlage mit zwischenueberhitzung
US5411365A (en) * 1993-12-03 1995-05-02 General Electric Company High pressure/intermediate pressure section divider for an opposed flow steam turbine
JPH08277701A (ja) * 1995-04-04 1996-10-22 Ishikawajima Harima Heavy Ind Co Ltd タービン静翼支持構造
US6637751B2 (en) * 2001-12-28 2003-10-28 General Electric Company Supplemental seal for the chordal hinge seals in a gas turbine
US6722850B2 (en) * 2002-07-22 2004-04-20 General Electric Company Endface gap sealing of steam turbine packing seal segments and retrofitting thereof
US6776577B1 (en) * 2003-02-06 2004-08-17 General Electric Company Method and apparatus to facilitate reducing steam leakage
GB0319002D0 (en) * 2003-05-13 2003-09-17 Alstom Switzerland Ltd Improvements in or relating to steam turbines
US7635250B2 (en) * 2006-03-22 2009-12-22 General Electric Company Apparatus and method for controlling leakage in steam turbines
JP2009108918A (ja) * 2007-10-30 2009-05-21 Toshiba Corp 回転機械のシール装置および回転機械
US8257015B2 (en) * 2008-02-14 2012-09-04 General Electric Company Apparatus for cooling rotary components within a steam turbine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015152742A1 (fr) * 2014-04-02 2015-10-08 General Electric Company Appareil et procédé permettant d'assurer l'étanchéité d'un ensemble turbine
CN106460558A (zh) * 2014-04-02 2017-02-22 通用电气公司 用于密封涡轮组件的设备和方法
CN106460558B (zh) * 2014-04-02 2018-05-15 通用电气公司 用于密封涡轮组件的设备和方法
US10704405B2 (en) 2014-04-02 2020-07-07 General Electric Company Apparatus and method for sealing turbine assembly

Also Published As

Publication number Publication date
JP2013224657A (ja) 2013-10-31
RU2013117914A (ru) 2014-10-27
US20130280048A1 (en) 2013-10-24
CN103375194B (zh) 2017-03-01
CN103375194A (zh) 2013-10-30

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