EP0326709B1 - Dampfturbine - Google Patents

Dampfturbine Download PDF

Info

Publication number: EP0326709B1
Authority: EP; European Patent Office
Prior art keywords: flow; steam; group; steam turbine; stage group
Prior art date: 1988-02-01
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.): Expired - Lifetime

Application number

EP88121746A

Other languages

German (de)

English (en)

French (fr)

Other versions

EP0326709A1 (de

Inventor

Jan-Erik Bertilsson

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.)

ABB Asea Brown Boveri Ltd

Original Assignee

ABB Asea Brown Boveri Ltd

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.)

1988-02-01

Filing date

1988-12-28

Publication date

1993-03-10

1988-12-28 Application filed by ABB Asea Brown Boveri Ltd filed Critical ABB Asea Brown Boveri Ltd

1989-08-09 Publication of EP0326709A1 publication Critical patent/EP0326709A1/de

1993-03-10 Application granted granted Critical

1993-03-10 Publication of EP0326709B1 publication Critical patent/EP0326709B1/de

2008-12-28 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

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Images

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
- F01D1/00—Non-positive-displacement machines or engines, e.g. steam turbines
- F01D1/02—Non-positive-displacement machines or engines, e.g. steam turbines with stationary working-fluid guiding means and bladed or like rotor, e.g. multi-bladed impulse steam turbines
- F01D1/023—Non-positive-displacement machines or engines, e.g. steam turbines with stationary working-fluid guiding means and bladed or like rotor, e.g. multi-bladed impulse steam turbines the working-fluid being divided into several separate flows ; several separate fluid flows being united in a single flow; the machine or engine having provision for two or more different possible fluid flow paths

Definitions

the invention is based on a steam turbine according to the preamble of patent claim 1.
the invention relates to a prior art as known from CH-A-211 167.
a multi-stage steam or gas turbine in the event of an overload, one or more pressure stages can be bridged by a bypass channel or by a bypass line in which a controllable valve is arranged. Only the remaining part of the steam or gas flows through the bridged pressure stages.
Regulating wheels with separately opening nozzle groups are used to control the output in steam turbine construction, because the efficiency that can be achieved in this way is better for the essential output range than in other systems.
the control wheel itself causes work to be extracted from the steam in such a way that the power control itself works optimally.
a compensation chamber is provided which enables the transition from partial loading to full loading.
the invention seeks to remedy this.
the invention as defined in claim 1, solves the problem of bringing about a smoothing of the flow during the transition from partial loading in the control stage to full loading of the remaining stages in a steam turbine which is operated in the partial load range with nozzle group control.
the effect of the proposal is that the steam flow is divided into two partial flows after the nozzle group. While a first partial flow acts on a first step group, the other partial flow flows via a bypass channel directly to the second step group, which is now also acted upon by the first partial flow and is therefore a fully acted on step group, in contrast to the step group solely acted upon by the first partial flow.
the main advantage of the invention can be seen in the fact that only a subset is applied to the first group of stages. This reduces the dynamic excitation of the blading to approx. 50%. Due to the fact that this partially loaded stage group receives a lower blade height due to the reduced mass flows, higher blade natural frequencies can be expected, which significantly reduces the risk of excitation.
the only figure shows the section between the nozzle group control and the first rows of blades of the turbine.
a section of a steam turbine can be seen, which shows the area between control wheel 2, nozzle 3 and the first rows of blades 11, 12 of the turbine.
the diameter of the control wheel 2 is larger than the diameter of the hub 1.
the difference in diameter must be kept such that the length of the overflow channel between the control stage and the reaction stage is acceptable in terms of construction costs, so that the channel volume is sufficient to completely homogenize the flow over the entire circumference of the channel.
this optimization itself can be dispensed with, because the steam flow is divided into two partial flows 4, 5 from the outlet of the control wheel 2, in the sense that the partial flow 5 flows through a bypass channel 8, in order then to act upon the stage group Turbine 11, 12 to merge with the other partial flow 4.
This second partial flow 4 initially acts on a first stage group 9, 10 of blades, which has a lower blade height than the other stage group 11, 12 provided downstream.
this is possible insofar as a reduced mass flow is applied to this first stage group 9, 10.
the advantages are eminent: the higher blade natural frequencies of this first stage group 9, 10 bring about a substantial reduction in the risk of excitation, as a result of which the second downstream stage group 11, 12 is subjected to a homogeneous flow.
Deflection elements 7 are provided which bring about a uniform distribution of the steam flow over the entire circumference.
the division of the steam flow into two partial flows 4, 5, in which the stage group 9, 10 initially acted upon by the partial flow 4 preferably consists of two blade stages, has the effect that the dynamic excitation of the turbine blading is reduced to approximately 50%.
the admixture of the partial stream 4 after the first stage group 9, 10 with the other partial stream 5 flowing through the bypass duct 8 takes place in such a way that the following stage group 11, 12 is acted upon almost completely by a single steam stream 6. This is achieved with the participation of the deflection elements 7 which have already been tightened.
a good admixture is further achieved in that the bypass channel 8 is designed spirally.
a channel 13 to the hub 1 is designed so that at a fourth valve point, i.e.
the steam flow initially acts on the first stage group 9, 10 for the most part.
An uneven flow with flow inhomogeneities is not to be feared in this operating mode, because in this case the steam flow is not influenced by the nozzle group control.
the steam flow is deflected upward in the direction of the bypass channel 8 by the swirl caused by the nozzle group control 2, 3, as a result of which the desired compensation of the flow irregularities resulting from the partial load is accomplished.
a distribution of the partial flow in the sense of achieving a flow homogeneity of the steam flow can also be achieved by installing throttle elements (not shown).

Landscapes

Engineering & Computer Science (AREA)
Physics & Mathematics (AREA)
Fluid Mechanics (AREA)
Mechanical Engineering (AREA)
General Engineering & Computer Science (AREA)
Turbine Rotor Nozzle Sealing (AREA)
Control Of Turbines (AREA)

EP88121746A 1988-02-01 1988-12-28 Dampfturbine Expired - Lifetime EP0326709B1 (de)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
CH332/88A CH675146A5 (ja)	1988-02-01	1988-02-01
CH332/88		1988-02-01

Publications (2)

Publication Number	Publication Date
EP0326709A1 EP0326709A1 (de)	1989-08-09
EP0326709B1 true EP0326709B1 (de)	1993-03-10

Family

ID=4184607

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP88121746A Expired - Lifetime EP0326709B1 (de)	1988-02-01	1988-12-28	Dampfturbine

Country Status (5)

Country	Link
US (1)	US4979873A (ja)
EP (1)	EP0326709B1 (ja)
JP (1)	JPH01224401A (ja)
CH (1)	CH675146A5 (ja)
DE (1)	DE3879170D1 (ja)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US5676521A (en) *	1996-07-22	1997-10-14	Haynes; Christopher J.	Steam turbine with superheat retaining extraction
DE59808650D1 (de)	1998-12-16	2003-07-10	Alstom Switzerland Ltd	Modulare Dampfturbine mit Standardbeschaufelung
DE10102899A1 (de) *	2001-01-23	2002-08-08	Martin Ziegler	Perpetuum Mobile der Dritten Art
DE102010042412A1 (de) *	2010-10-13	2012-04-19	Robert Bosch Gmbh	Dampfturbine
JP5913910B2 (ja) *	2011-04-26	2016-04-27	国際計測器株式会社	直動アクチュエータ及び加振装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US1090110A (en) *	1910-11-17	1914-03-10	Gen Electric	Multistage turbine.
FR731766A (fr) *	1931-03-24	1932-09-08	Ljungstroms Angturbin Ab	Dispositif applicable aux jeux d'aubes axiales de turbines à gaz ou à vapeur
DE663207C (de) *	1936-07-11	1938-08-01	Oskar Jebens	Turbine, insbesondere fuer Schiffsanlagen, mit UEberbrueckung von Stufen
GB530022A (en) *	1938-06-17	1940-12-03	British Thomson Houston Co Ltd	Improvements in and relating to elastic fluid turbines
CH211167A (de) *	1939-06-15	1940-08-31	Escher Wyss Maschf Ag	Mehrstufige Dampf- oder Gasturbine, deren erstes Stufengefälle unterkritisch ist, und welcher zur Erhöhung der Leistungsfähigkeit zusätzliches Arbeitsmittel zugeführt wird.
US2269235A (en) *	1939-12-22	1942-01-06	Gen Electric	Multistage elastic fluid turbine
DE831580C (de) *	1948-10-02	1952-02-14	Steinmueller Gmbh L & C	Vorrichtung zur Foerderung staubhaltiger Gase mittels Axialgeblaese
US2952973A (en) *	1958-06-02	1960-09-20	Gen Motors Corp	Turbofan-ramjet engine
DE2844681B1 (de) *	1978-10-13	1980-04-10	Blohm Voss Ag	Entnahmekondensationsturbine
JPS5990703A (ja) *	1982-11-15	1984-05-25	Fuji Electric Co Ltd	蒸気タ−ビンの調速段
US4527387A (en) *	1982-11-26	1985-07-09	General Electric Company	Particle separator scroll vanes

1988
- 1988-02-01 CH CH332/88A patent/CH675146A5/de not_active IP Right Cessation
- 1988-12-28 EP EP88121746A patent/EP0326709B1/de not_active Expired - Lifetime
- 1988-12-28 DE DE8888121746T patent/DE3879170D1/de not_active Expired - Fee Related
1989
- 1989-01-27 US US07/302,373 patent/US4979873A/en not_active Expired - Fee Related
- 1989-02-01 JP JP1020958A patent/JPH01224401A/ja active Pending

Also Published As

Publication number	Publication date
US4979873A (en)	1990-12-25
CH675146A5 (ja)	1990-08-31
DE3879170D1 (de)	1993-04-15
JPH01224401A (ja)	1989-09-07
EP0326709A1 (de)	1989-08-09

Legal Events

Date	Code	Title	Description
1989-06-24	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
1989-08-09	AK	Designated contracting states	Kind code of ref document: A1 Designated state(s): CH DE FR GB IT LI
1990-03-28	17P	Request for examination filed	Effective date: 19900131
1991-04-17	17Q	First examination report despatched	Effective date: 19910305
1993-01-22	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
1993-03-10	AK	Designated contracting states	Kind code of ref document: B1 Designated state(s): CH DE FR GB IT LI
1993-04-15	REF	Corresponds to:	Ref document number: 3879170 Country of ref document: DE Date of ref document: 19930415
1993-04-23	ITF	It: translation for a ep patent filed	Owner name: DE DOMINICIS & MAYER S.R.L.
1993-05-07	ET	Fr: translation filed
1993-06-16	GBT	Gb: translation of ep patent filed (gb section 77(6)(a)/1977)	Effective date: 19930517
1993-12-31	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: LI Effective date: 19931231 Ref country code: CH Effective date: 19931231
1994-01-13	PLBE	No opposition filed within time limit	Free format text: ORIGINAL CODE: 0009261
1994-01-13	STAA	Information on the status of an ep patent application or granted ep patent	Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT
1994-03-02	26N	No opposition filed
1994-08-31	REG	Reference to a national code	Ref country code: CH Ref legal event code: PL
1996-11-13	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: GB Payment date: 19961113 Year of fee payment: 9
1996-11-18	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: FR Payment date: 19961118 Year of fee payment: 9
1997-12-28	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19971228
1997-12-31	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: FR Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY Effective date: 19971231
1998-08-19	GBPC	Gb: european patent ceased through non-payment of renewal fee	Effective date: 19971228
1998-10-09	REG	Reference to a national code	Ref country code: FR Ref legal event code: ST
2000-12-13	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: DE Payment date: 20001213 Year of fee payment: 13
2002-07-02	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20020702
2005-12-28	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20051228

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