US20100133756A1 - Shaft seal for steam turbines - Google Patents

Shaft seal for steam turbines Download PDF

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Publication number
US20100133756A1
US20100133756A1 US12/598,609 US59860908A US2010133756A1 US 20100133756 A1 US20100133756 A1 US 20100133756A1 US 59860908 A US59860908 A US 59860908A US 2010133756 A1 US2010133756 A1 US 2010133756A1
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US
United States
Prior art keywords
steam
chamber
shaft seal
sealing
condensation chamber
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
US12/598,609
Inventor
Edwin Gobrecht
Achim Hammann
Dirk Knudsen
Karsten Peters
Jan Walkenhorst
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
Assigned to SIEMENS AKTIENGESELLSCHAFT reassignment SIEMENS AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KNUDSEN, DIRK, GOBRECHT, EDWIN, HAMMANN, ACHIM, PETERS, KARSTEN, WALKENHORST, JAN
Publication of US20100133756A1 publication Critical patent/US20100133756A1/en
Abandoned legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/16Sealings between relatively-moving surfaces
    • F16J15/32Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3284Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
    • F16J15/3288Filamentary structures, e.g. brush seals
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02CGAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/24Heat or noise insulation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00Application
    • F05D2220/30Application in turbines
    • F05D2220/31Application in turbines in steam turbines
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00Components
    • F05D2240/55Seals
    • F05D2240/56Brush seals

Definitions

  • the present invention refers to a shaft seal for steam turbines, in which the shaft-seal sealing steam is fed with a slight overpressure.
  • Shaft seals of steam turbines are constructed with sealing steam.
  • the sealing steam is fed to the shaft seal with a slight overpressure.
  • the sealing-steam system is supplied with steam from the steam turbine at a suitable pressure and temperature.
  • the sealing steam is extracted from an auxiliary steam system.
  • the sealing-steam system comprises a sealing-steam chamber which is under a slight overpressure, and a leakoff-steam chamber which is held under a slight negative pressure in relation to atmosphere.
  • a leakoff-steam chamber In the leakoff-steam chamber the ingressing air and a partial mass flow of the steam from the sealing-steam chamber mix together. This so-called leakoff vapor is exhausted by means of a blower.
  • the steam which is contained herein is re-liquefied in a condenser and fed to the water-steam system.
  • a costly piping construction for the leakoff lines, including exhaust blowers, valves and leakoff steam condenser is required.
  • FIG. 1 shows the principle construction of a known shaft seal
  • FIG. 2 shows the principle construction of a shaft seal according to the invention.
  • FIG. 1 in which the prior art is shown, the turbine casing is identified by 1 and the shaft identified by 2 .
  • the shaft seal which is shown here has a sealing-steam chamber 3 and a leakoff-steam chamber 4 .
  • Seals for example labyrinth seals, are located between the leakoff-steam chamber 4 and the surrounding air 5 , and also between the leakoff-steam chamber 4 and the sealing-steam chamber 3 , and also between the sealing-steam chamber 3 and the inside of the turbine.
  • FIG. 2 a shaft seal according to the present invention is shown in principle.
  • the turbine casing is identified by 6 and the shaft is identified by 7 .
  • the shaft seal according to the invention has a sealing-steam chamber 8 which is sealed in relation to the inside of the turbine by a labyrinth seal.
  • a condensation chamber 11 is now located between the ambient air 5 and the sealing-steam chamber 8 and is sealed by brush seals 9 and 10 both in relation to the surrounding air 5 and in relation to the sealing-steam chamber 8 .
  • the condensation chamber 11 in this case is constructed so that it discharges the heat which develops therein to the outside, that is to say, it is not integrated into the actual steam turbine.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Sealing Devices (AREA)

Abstract

A shaft seal for steam turbines is provided. The shaft seal steam barrier is supplied with a slight excess pressure. In order to avoid complex additional devices necessary for liquefying the water vapor once again, a condensation chamber, which is sealed from the surrounding air as well as from the steam barrier chamber with brush seals, is provided between the steam barrier chamber and the surrounding air. The condensation chamber is constructed in such a manner that the heat, developing in the interior thereof, is discharged to the outside.

Description

    CROSS REFERENCE TO RELATED APPLICATIONS
  • This application is the US National Stage of International Application No. PCT/EP2008/054868, filed Apr. 22, 2008 and claims the benefit thereof. The International Application claims the benefits of German application No. 10 2007 021 742.2 DE filed May 9, 2007, both of the applications are incorporated by reference herein in their entirety.
  • FIELD OF INVENTION
  • The present invention refers to a shaft seal for steam turbines, in which the shaft-seal sealing steam is fed with a slight overpressure.
  • BACKGROUND OF INVENTION
  • Shaft seals of steam turbines are constructed with sealing steam. The sealing steam is fed to the shaft seal with a slight overpressure. During operation, the sealing-steam system is supplied with steam from the steam turbine at a suitable pressure and temperature. When evacuating before start-up of the machine, and at low load, the sealing steam is extracted from an auxiliary steam system.
  • SUMMARY OF INVENTION
  • The sealing-steam system comprises a sealing-steam chamber which is under a slight overpressure, and a leakoff-steam chamber which is held under a slight negative pressure in relation to atmosphere. In the leakoff-steam chamber the ingressing air and a partial mass flow of the steam from the sealing-steam chamber mix together. This so-called leakoff vapor is exhausted by means of a blower. The steam which is contained herein is re-liquefied in a condenser and fed to the water-steam system. For this, a costly piping construction for the leakoff lines, including exhaust blowers, valves and leakoff steam condenser, is required.
  • It is the object of the present invention to disclose a shaft seal of the type referred to in the introduction, in which complex additional devices are not necessary in order to re-liquefy the leakoff vapor.
  • This object is achieved for the shaft seal which is referred to in the introduction by a condensation chamber being provided between the sealing-steam chamber and the surrounding air and being sealed by brush seals both in relation to the surrounding air and in relation to the sealing-steam chamber, wherein the condensation chamber is constructed so that the heat which develops therein is discharged to the outside.
  • As a result of the condensation directly on the turbine, the entire piping construction for the leakoff lines, including exhaust blower, valves and leakoff steam condenser, is dispensed with. Appreciable savings therefore result in the case of the shaft seal according to the invention.
  • Advantageous developments of the present invention result from the dependent claims and also from the description of an exemplary embodiment with reference to the attached drawing.
  • With reference to the attached drawing, the principle construction of a current embodiment of a shaft seal, and also the principle construction of a shaft seal according to the invention, are shown in the following.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • In the drawing:
  • FIG. 1 shows the principle construction of a known shaft seal, and
  • FIG. 2 shows the principle construction of a shaft seal according to the invention.
  • DETAILED DESCRIPTION OF INVENTION
  • In FIG. 1, in which the prior art is shown, the turbine casing is identified by 1 and the shaft identified by 2. The shaft seal which is shown here has a sealing-steam chamber 3 and a leakoff-steam chamber 4. Seals, for example labyrinth seals, are located between the leakoff-steam chamber 4 and the surrounding air 5, and also between the leakoff-steam chamber 4 and the sealing-steam chamber 3, and also between the sealing-steam chamber 3 and the inside of the turbine.
  • The leakoff lines and the valves which are associated with them, and the leakoff-steam condenser, shall not be dealt with in more detail here since these are known to the person skilled in the art and these are not essential for the actual inventive idea either.
  • In FIG. 2, a shaft seal according to the present invention is shown in principle. The turbine casing is identified by 6 and the shaft is identified by 7. The shaft seal according to the invention has a sealing-steam chamber 8 which is sealed in relation to the inside of the turbine by a labyrinth seal.
  • A condensation chamber 11 is now located between the ambient air 5 and the sealing-steam chamber 8 and is sealed by brush seals 9 and 10 both in relation to the surrounding air 5 and in relation to the sealing-steam chamber 8. The condensation chamber 11 in this case is constructed so that it discharges the heat which develops therein to the outside, that is to say, it is not integrated into the actual steam turbine.
  • By the use of modern sealing technologies, such as the use of brush seals, only a fraction of the previous leakoff steam volume is produced. This can then be condensed directly on the steam turbine by means of the condensation chamber 11.
  • As a result of the condensation directly on the steam turbine the entire piping construction for the leakoff lines and also the leakoff-steam condenser, the valves and the exhaust blower, are dispensed with.

Claims (5)

1.-3. (canceled)
4. A shaft seal for steam turbines, comprising:
a shaft-seal sealing chamber;
a condensation chamber provided between the sealing-steam chamber and a surrounding air;
a plurality of brush seals,
wherein the shaft-seal sealing chamber is fed with a slight overpressure,
wherein the condensation chamber is sealed by the plurality of brush seals both in relation to the surrounding air and in relation to the sealing-steam chamber, and
wherein the condensation chamber is constructed so that the heat which develops therein is discharged to the outside.
5. The shaft seal as claimed in claim 4, wherein the condensation chamber is fixed with a flange and wherein an insulating layer is arranged between the condensation chamber and steam turbine.
6. The shaft seal as claimed in claim 4, wherein the condensation chamber is cast onto the steam turbine and is insulated in relation to the steam turbine.
7. The shaft seal as claimed in claim 4, wherein the sealing-steam chamber is sealed in relation to an inside of the steam turbine by a labyrinth seal.
US12/598,609 2007-05-09 2008-04-22 Shaft seal for steam turbines Abandoned US20100133756A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007021742.2 2007-05-09
DE102007021742A DE102007021742B4 (en) 2007-05-09 2007-05-09 Shaft seal for steam turbines
PCT/EP2008/054868 WO2008138713A1 (en) 2007-05-09 2008-04-22 Shaft seal for steam turbines

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/054868 A-371-Of-International WO2008138713A1 (en) 2007-05-09 2008-04-22 Shaft seal for steam turbines

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US13/525,688 Continuation US9175775B2 (en) 2007-05-09 2012-06-18 Shaft seal for steam turbines

Publications (1)

Publication Number Publication Date
US20100133756A1 true US20100133756A1 (en) 2010-06-03

Family

ID=39673036

Family Applications (2)

Application Number Title Priority Date Filing Date
US12/598,609 Abandoned US20100133756A1 (en) 2007-05-09 2008-04-22 Shaft seal for steam turbines
US13/525,688 Expired - Fee Related US9175775B2 (en) 2007-05-09 2012-06-18 Shaft seal for steam turbines

Family Applications After (1)

Application Number Title Priority Date Filing Date
US13/525,688 Expired - Fee Related US9175775B2 (en) 2007-05-09 2012-06-18 Shaft seal for steam turbines

Country Status (6)

Country Link
US (2) US20100133756A1 (en)
EP (1) EP2142762B1 (en)
JP (1) JP2010526249A (en)
CN (1) CN101680307B (en)
DE (1) DE102007021742B4 (en)
WO (1) WO2008138713A1 (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1562019A (en) * 1922-09-05 1925-11-17 Gen Electric Shaft packing for elastic-fluid turbines and the like
US4924817A (en) * 1988-04-15 1990-05-15 Josef Seelen Seal for blast pipe or shaft
US5941506A (en) * 1995-06-07 1999-08-24 Electric Boat Corporation Steam seal air removal system
US6082740A (en) * 1998-03-10 2000-07-04 General Electric Co. Bolted-ring seal casing for hydrogen cooled generators
US6685190B1 (en) * 2000-10-17 2004-02-03 General Electric Company Ventilated trickle seal
US6790001B2 (en) * 2002-11-22 2004-09-14 General Electric Company Brush seal arrangement for high pressure applications
US20050098958A1 (en) * 2003-11-07 2005-05-12 The Boeing Company Gas-buffered seal assembly and method therefor
US6976679B2 (en) * 2003-11-07 2005-12-20 The Boeing Company Inter-fluid seal assembly and method therefor
US7559554B2 (en) * 2002-10-03 2009-07-14 Alstom Technology Ltd Sealing arrangement using brush seals

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1201361A (en) * 1958-08-20 1959-12-30 Bretagne Atel Chantiers Improvement in sealing devices, especially steam turbines
DE4020587A1 (en) * 1990-06-28 1992-01-02 Siemens Ag VAPOR STEAM CONDENSER ARRANGEMENT
JP3006295B2 (en) * 1992-07-07 2000-02-07 富士電機株式会社 Ground seal part of steam turbine
JP3977546B2 (en) * 1999-03-25 2007-09-19 株式会社東芝 Steam turbine power generation equipment
JP4776249B2 (en) * 2005-02-25 2011-09-21 株式会社東芝 Liquid shaft seal device and rotating electric machine using the shaft seal device
US20070132190A1 (en) * 2005-12-12 2007-06-14 Charles Trabert Axial dynamic brush seal

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1562019A (en) * 1922-09-05 1925-11-17 Gen Electric Shaft packing for elastic-fluid turbines and the like
US4924817A (en) * 1988-04-15 1990-05-15 Josef Seelen Seal for blast pipe or shaft
US5941506A (en) * 1995-06-07 1999-08-24 Electric Boat Corporation Steam seal air removal system
US6082740A (en) * 1998-03-10 2000-07-04 General Electric Co. Bolted-ring seal casing for hydrogen cooled generators
US6685190B1 (en) * 2000-10-17 2004-02-03 General Electric Company Ventilated trickle seal
US7559554B2 (en) * 2002-10-03 2009-07-14 Alstom Technology Ltd Sealing arrangement using brush seals
US6790001B2 (en) * 2002-11-22 2004-09-14 General Electric Company Brush seal arrangement for high pressure applications
US20050098958A1 (en) * 2003-11-07 2005-05-12 The Boeing Company Gas-buffered seal assembly and method therefor
US6976679B2 (en) * 2003-11-07 2005-12-20 The Boeing Company Inter-fluid seal assembly and method therefor

Also Published As

Publication number Publication date
DE102007021742B4 (en) 2009-04-09
US9175775B2 (en) 2015-11-03
US20120251294A1 (en) 2012-10-04
CN101680307B (en) 2013-10-16
WO2008138713A1 (en) 2008-11-20
DE102007021742A1 (en) 2008-11-13
CN101680307A (en) 2010-03-24
EP2142762A1 (en) 2010-01-13
JP2010526249A (en) 2010-07-29
EP2142762B1 (en) 2013-05-29

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SIEMENS AKTIENGESELLSCHAFT,GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GOBRECHT, EDWIN;HAMMANN, ACHIM;KNUDSEN, DIRK;AND OTHERS;SIGNING DATES FROM 20090917 TO 20090927;REEL/FRAME:023460/0558

STCB Information on status: application discontinuation

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