EP1048823A2 - Alimentation de vapeur de barrage - Google Patents

Alimentation de vapeur de barrage Download PDF

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Publication number
EP1048823A2
EP1048823A2 EP00810328A EP00810328A EP1048823A2 EP 1048823 A2 EP1048823 A2 EP 1048823A2 EP 00810328 A EP00810328 A EP 00810328A EP 00810328 A EP00810328 A EP 00810328A EP 1048823 A2 EP1048823 A2 EP 1048823A2
Authority
EP
European Patent Office
Prior art keywords
steam
barrier
temperature
point
live
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Withdrawn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
EP00810328A
Other languages
German (de)
English (en)
Other versions
EP1048823A3 (fr
Inventor
Gerald Charoton
Jean-Pierre Rickli
Ernst Walz
Peter Zeller
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 Switzerland GmbH
Original Assignee
ABB Alstom Power Switzerland Ltd
Alstom Schweiz 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 ABB Alstom Power Switzerland Ltd, Alstom Schweiz AG filed Critical ABB Alstom Power Switzerland Ltd
Publication of EP1048823A2 publication Critical patent/EP1048823A2/fr
Publication of EP1048823A3 publication Critical patent/EP1048823A3/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Withdrawn legal-status Critical Current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
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
    • 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
    • F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
    • F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
    • F01D11/06—Control thereof

Definitions

  • the present invention relates to a system for supplying sealing steam in shaft seals of a steam turbine, the steam turbine by one Boiler is supplied with live steam, which boiler from at least one Evaporator and a superheater, and at least one Place the superheater below the live steam temperature Tapping point is provided
  • Blocking system prevents steam from escaping the high pressure shaft seal prevented.
  • the leakage steam is therefore discharged into a separate system, instead of pouring into the atmosphere.
  • This steam can be used for Low-pressure shaft seal, where it flows out as sealing steam, and displaced air from the shaft seal.
  • the high-pressure leakage quantity and the Sealing steam quantity to the low-pressure shaft seal in equilibrium are usually provided over which excess Leakage vapor is discharged into the condenser, for example, or vice versa Additional barrier steam is supplied.
  • the additional sealing steam feed particularly important in transient operating conditions if for example, when starting the machine, the pressure in the High-pressure housings are not yet sufficient to provide sufficient sealing steam deliver. In the case of strongly throttled or closed control valves, The high pressure shaft seals are even supplied with sealing steam.
  • the additional barrier steam is usually from the live steam line fed. This creates sealing steam with the high thermodynamic data of live steam at the turbine inlet, which is successively is reduced to conditions, for example by water injection especially the material temperature of the shaft and housing Steam turbine are adapted to the respective sealing point.
  • EP 0 605 156 B1 proposes the possibility of providing the live steam line of different temperature levels of the boiler to dine. While the turbine is starting up, the supply of the the highest superheated steam to the live steam line in whole or in part interrupted. In this case, the live steam supply comes from a Intermediate stage of the superheater with reduced temperature level. By Another admixture of saturated steam from the boiler drum Possibility to control the live steam temperature.
  • thermodynamic state of the steam which is used as an additional barrier steam Barrier steam system is still directed to the live steam state coupled.
  • the result of this is that even when implementing the specified circuit measures for the conditioning of the barrier steam are necessary in certain operating states.
  • Steam turbine quick shutdown therefore also exists when using the Circuit and the method according to EP 0 605 156 B1 are very dangerous, especially in the field of high-pressure shaft seals, the shaft and that To impose large temperature jumps on the housing:
  • the steam from the high pressure shaft seal namely expanded at least over a few labyrinth tips and thus already considerably cooler than live steam.
  • water injection can also be used do not compensate for this temperature jump and continue to lead to the Danger of dropping water on the surface of the hot wave.
  • the invention seeks to remedy this.
  • the aim of the invention is in a Circuit for feeding steam into the barrier steam system Steam turbine, the steam turbine passing from a boiler Live steam line is supplied with live steam, which boiler is off there is at least one evaporator and a superheater, and wherein at least at one point of the superheater below the Fresh steam temperature there is a tapping point, the circuit so execute that the sealing steam temperature to the material temperatures in Range of shaft seals is adjusted.
  • this is achieved in that the tapping point is such is chosen that the steam temperature at this point of withdrawal Material temperature is adjusted in the area of a high pressure shaft seal, that a feed line to the barrier steam system with this tapping point is connected, and that the feed line and the sealing steam system are completely isolated from the live steam line.
  • the essence of the invention is therefore to supply the steam turbine with the additional steam from the live steam supply to the machine to decouple.
  • a withdrawal point on Superheater of the boiler created, at which superheated steam below the live steam temperature is taken, which is used as additional barrier steam is being used.
  • the feed line for the additional barrier steam is therefore connected to a removal point of the superheater, at which
  • the tapping point is the steam temperature below the live steam temperature lies and with the material temperature of the shaft and housing especially in High pressure shaft seal range is compatible.
  • the feed line can be directly from the Lead the tapping point of the superheater to the sealing steam system; at a appropriate design of the water-steam cycle can Removal point of the superheater but also with an auxiliary steam rail be connected, for example, steam at a pressure of 20 bar and a temperature of around 400 ° C. from this auxiliary steam rail can then other subsystems such as for example, the evacuation ejectors are supplied with steam.
  • a Auxiliary steam rail is also advantageous if several steam sources, such as for example the waste heat boilers of several gas turbines or an additional one Auxiliary boilers to be connected to the steam turbine subsystems.
  • Fig. 1 shows an embodiment of the invention, in which the Intermediate tapping point of the superheater directly with the Barrier steam system is connected.
  • Fig. 2 shows another preferred Embodiment in which an auxiliary steam rail between the Barrier steam system and the tapping point is switched.
  • Fig. 1 shows a first embodiment of the invention.
  • Feed water is supplied by one Pump 12 brought to a pressure and evaporated in an evaporator 1.
  • the saturated steam in is a superheater 2 to the live steam state overheated and via a live steam line 3, the quick-closing valve 44 and the turbine control valve 43 fed to the steam turbine 5 and relaxed.
  • the relaxed steam is liquefied in the condenser 6 and stands available again as feed water.
  • the pressure in the sealing steam system 9 is in the interaction of the valves 8 and 45 regulated.
  • an amount of steam flows from the high pressure part of the turbine 5 to the high pressure shaft seal 55 and from there into the barrier steam system.
  • This amount of steam is in one Injection cooler 10 cooled by the injection of water into the steam and led as sealing steam to the low pressure shaft seal 56, the Water injection branches off the feed water line, and the Injection quantity is set by an injection control valve 46.
  • the pressure relief valve 45 is derived, for example, into the condenser.
  • sealing steam i.e. a minimum pressure in the Barrier steam system 9
  • the additional vapor control valve opens 8 if the pressure in the sealing steam system is too low
  • Additional vapor control valve 8 and a feed line 7 is that Additional steam system 9 with the superheater 2 at a suitable Tapping point 24 connected to the superheated steam at a temperature is available that is compatible with the material temperature that is used in stationary operation is present on the high pressure shaft seal.
  • the feed line 7 is not permanently flowed through by superheated steam is, it is appropriate, in this line, if possible, directly upstream of the Additional bubble control valve 8 to provide drainage. Otherwise there is a risk that 7 steam has condensed out in the feed line, and this condensate when opening the additional vapor control valve in the Barrier steam system 9 is entrained into it.
  • the drainage 11 Avoided that under certain circumstances condensate droplets on hot Impact material in the area of the high pressure shaft seal and Cause jumps in temperature.
  • the mode of operation of the invention is as follows: Barrier steam system in normal operation has already been explained. The invention now comes into play especially when additional barrier steam is used High pressure shaft seal must be performed, especially as above mentioned, when starting up and during a turbine shutdown. After this State of the art is the feed line 7 with the live steam line 3 connected upstream of the quick-closing valve 44. Especially with one Rapid shutdown would mean that live steam immediately High-pressure shaft seal 55 flows, which in normal operation with partially relaxed Steam is applied from the high pressure part of the turbine 5. It follows from this a temperature shock for the material of the shaft and the housing in the Area of high pressure shaft seal 55. To local Avoiding overheating of the material can result in one such cases also in the sealing steam supply line to the high pressure shaft seal a water injection may be present.
  • FIG. 2 shows a further embodiment variant of the invention.
  • the The water-steam cycle is identical to that described above.
  • the barrier steam system is supplied with a Auxiliary steam rail 20 between the removal point 24 of the superheater 2 and the barrier steam system 9 switched.
  • a reducing valve 21 in the feed line 71.
  • the pressure of the auxiliary steam rail is regulated.
  • the variant is suitable especially if several steam sources are on one or more Consumers are switched on.
  • the Barrier steam system 9 also evacuation ejectors 22 on the Auxiliary steam rail switched on.
  • another steam source is connected to the auxiliary steam rail. This could be another kettle, or a small auxiliary kettle, as is often the case is used in combi systems to accelerate auxiliary steam for an Ready to start the system.
  • the auxiliary steam rail is also advantageous equipped with a drainage 11.
  • the reducing valve 21 regulates the pressure of the Auxiliary steam system.
  • the pressure in the auxiliary steam system 9 becomes as above described by the additional vapor control valve 8 and that Pressure relief valve 45 set.
EP00810328A 1999-04-29 2000-04-14 Alimentation de vapeur de barrage Withdrawn EP1048823A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19919653A DE19919653A1 (de) 1999-04-29 1999-04-29 Sperrdampfeinspeisung
DE19919653 1999-04-29

Publications (2)

Publication Number Publication Date
EP1048823A2 true EP1048823A2 (fr) 2000-11-02
EP1048823A3 EP1048823A3 (fr) 2002-11-27

Family

ID=7906381

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00810328A Withdrawn EP1048823A3 (fr) 1999-04-29 2000-04-14 Alimentation de vapeur de barrage

Country Status (5)

Country Link
US (1) US6237543B1 (fr)
EP (1) EP1048823A3 (fr)
JP (1) JP2000328903A (fr)
CN (1) CN1274056A (fr)
DE (1) DE19919653A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1961921A1 (fr) * 2007-02-26 2008-08-27 Siemens Aktiengesellschaft Joint d'étanchéité pour turbomachine
EP2620600A1 (fr) * 2012-01-25 2013-07-31 Siemens Aktiengesellschaft Procédé destiné au fonctionnement d'une centrale à vapeur
WO2014048986A1 (fr) * 2012-09-28 2014-04-03 Man Diesel & Turbo Se Système à vapeur de barrage pourvu d'un dispositif de refroidissement de vapeur de barrage

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004012599A1 (de) * 2004-03-12 2005-09-29 Alstom Technology Ltd Druckentlastung einer Flanschverbindung in Überströmleitungen zwischen Frischdampfventil und HD-Dampfturbineneintritt
US20060233634A1 (en) * 2005-04-18 2006-10-19 General Electric Company Method of indicating sealing steam temperature and related apparatus
EP1806533A1 (fr) * 2006-01-05 2007-07-11 Siemens Aktiengesellschaft Cycle à vapeur d'une centrale électrique
US7640724B2 (en) * 2006-01-25 2010-01-05 Siemens Energy, Inc. System and method for improving the heat rate of a turbine
US20110110760A1 (en) * 2009-11-10 2011-05-12 General Electric Company Method and system for increasing an efficiency of a pressurized machine
US9003799B2 (en) * 2012-08-30 2015-04-14 General Electric Company Thermodynamic cycle optimization for a steam turbine cycle
CN103352734A (zh) * 2013-07-01 2013-10-16 广东博海昕能环保有限公司 一种汽封加热器疏水回收方法及系统
BE1021896B1 (nl) 2014-05-19 2016-01-25 Atlas Copco Airpower Naamloze Vennootschap Werkwijze voor het laten expanderen van een gasdebiet en inrichting daarbij toegepast
US11008896B2 (en) * 2015-11-06 2021-05-18 Jonathan Paul Gill Water driven turbine steam engine
JP7115968B2 (ja) * 2018-12-10 2022-08-09 東芝プラントシステム株式会社 発電システムおよび蒸気供給方法
DE102020006724A1 (de) * 2020-11-03 2022-05-05 Netzsch Trockenmahltechnik Gmbh Betriebsverfahren für einen Sichter und Sichter zur Klassifizierung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0605156B1 (fr) 1992-12-30 1997-09-03 General Electric Company Méthode de démarrage d'un turbine froide à vapeur dans une centrale combinée

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1105431B (de) * 1959-04-22 1961-04-27 Sulzer Ag Einrichtung zur Lieferung von Sperrdampf fuer Dichtungsstellen in Dampfkraftanlagen,insbesondere Dampfturbinenanlagen
US3789804A (en) * 1972-12-14 1974-02-05 Sulzer Ag Steam power plant with a flame-heated steam generator and a group of gas turbines
CH635401A5 (de) * 1978-08-31 1983-03-31 Bbc Brown Boveri & Cie Sperrdampfvorrichtung und verwendung desselben.
US4241701A (en) * 1979-02-16 1980-12-30 Leeds & Northrup Company Method and apparatus for controlling steam temperature at a boiler outlet
DE4313805A1 (de) * 1993-04-27 1994-11-03 Siemens Ag Dichtungsanordnung für zumindest eine Durchführung einer Welle durch ein Gehäuse
DE19538674A1 (de) * 1995-10-17 1997-04-24 Siemens Ag Verfahren und Einrichtung zur Erzeugung von überhitztem Dampf aus Sattdampf sowie Dampfkraftanlage

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0605156B1 (fr) 1992-12-30 1997-09-03 General Electric Company Méthode de démarrage d'un turbine froide à vapeur dans une centrale combinée

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1961921A1 (fr) * 2007-02-26 2008-08-27 Siemens Aktiengesellschaft Joint d'étanchéité pour turbomachine
EP2620600A1 (fr) * 2012-01-25 2013-07-31 Siemens Aktiengesellschaft Procédé destiné au fonctionnement d'une centrale à vapeur
WO2014048986A1 (fr) * 2012-09-28 2014-04-03 Man Diesel & Turbo Se Système à vapeur de barrage pourvu d'un dispositif de refroidissement de vapeur de barrage

Also Published As

Publication number Publication date
US6237543B1 (en) 2001-05-29
CN1274056A (zh) 2000-11-22
EP1048823A3 (fr) 2002-11-27
DE19919653A1 (de) 2000-11-02
JP2000328903A (ja) 2000-11-28

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