EP0418887B1 - Kreisringförmiger Diffusor für Dampfturbinen - Google Patents

Kreisringförmiger Diffusor für Dampfturbinen Download PDF

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Publication number
EP0418887B1
EP0418887B1 EP19900118119 EP90118119A EP0418887B1 EP 0418887 B1 EP0418887 B1 EP 0418887B1 EP 19900118119 EP19900118119 EP 19900118119 EP 90118119 A EP90118119 A EP 90118119A EP 0418887 B1 EP0418887 B1 EP 0418887B1
Authority
EP
European Patent Office
Prior art keywords
annular
diffusor
chamber
mounting rim
gap
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.)
Expired - Lifetime
Application number
EP19900118119
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0418887A1 (de
Inventor
Miroslav Stastny
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.)
SKODA KONCERN PLZEN
Skoda kp
Original Assignee
SKODA KONCERN PLZEN
Skoda kp
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 SKODA KONCERN PLZEN, Skoda kp filed Critical SKODA KONCERN PLZEN
Publication of EP0418887A1 publication Critical patent/EP0418887A1/de
Application granted granted Critical
Publication of EP0418887B1 publication Critical patent/EP0418887B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/30—Exhaust heads, chambers, or the like
    • 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
    • F01D25/32—Collecting of condensation water; Drainage ; Removing solid particles

Definitions

  • the invention relates to a diffuser for the low pressure part of a steam turbine of the type specified in the preamble of claim 1.
  • Diffusers of this type are arranged downstream of the last working stage of the steam turbine for pressure recovery in order to ensure the uniform discharge of the relaxed steam.
  • the function of the diffusers can be improved by providing a gap for aspirating or blowing in a liquid medium, but this is associated with various problems.
  • suction gaps there is a complicated removal of the extracted steam into zones of low pressure and the desired mode of operation is only possible within a relatively narrow range of the amount of steam to be extracted.
  • the energy consumption required to extract the steam is disadvantageous.
  • the provision of blowing gaps leads to a complicated supply of steam and losses due to the energy required for blowing.
  • a guide vane arrangement for a steam turbine which is formed by the guide vanes and an outer mounting ring, an annular chamber provided in the mounting ring via inflow openings is connected to the interiors between the guide vanes and has outflow openings in its outer peripheral wall. Radial slots are provided in the side walls of the guide vanes for the condensate discharge into the annular chamber.
  • the invention has for its object to provide an improved circular diffuser for steam turbines that allows effective evacuation of relaxed exhaust steam and possibly condensate in a wide working range of the turbine with virtually no energy consumption with a simple structure and improved efficiency.
  • the diffuser formed from a ring of the last guide wheel, its guide vanes, an outer and an inner jacket contains an annular chamber in the ring of the last guide wheel above the guide vanes with gaps, which, according to the invention, is connected via channels to a peripheral collecting chamber which is between the front and is formed in the rear part of the outer casing and is connected to the free space of the expanded diffuser part via an injection gap provided on the inner surface of the outer casing.
  • the diffuser according to the invention ensures adequate removal of the condensate through the gaps in the hollow guide vanes and through the vertical gap from the space between the guide vanes and the rotor blades of the last stage.
  • the condensate is entrained by a steam component and, in addition to a noticeable reduction in blade erosion, this steam component is advantageously blown tangentially into the expanded part of the diffuser through the blowing gap.
  • Such a tangential injection reduces the area of flow separation on the outer wall of the diffuser and at the same time increases the output of the steam turbine.
  • a preferred embodiment of the diffuser according to the invention is explained in more detail below with reference to the schematic drawing, which shows a longitudinal section of the last stage of a steam turbine and the downstream diffuser.
  • the illustrated annular diffuser with blowing is made up of a ring 2 of the last guide wheel mounted in a body 01 of the LP part of the steam turbine, the guide vanes 1 fixed with their outer ends in the ring 2, an outer jacket 11 fastened to the end face of the ring 2, and one formed the front part of a guide element 13 forming the outer jacket.
  • a vertical gap 8 is provided between a fastening flange 31 on the guide element 13 of the outer casing and the end face of the ring 2.
  • the outer jacket 11 is fastened directly to the end face of the body 01 by means of an annular flange 30.
  • An annular collecting chamber 7 is provided in the end part 11 of the outer jacket and the outer surface of the guide element 13.
  • This annular chamber 5 is arranged in the ring 2 above the guide vanes 1, in each of which a long radial gap 3 is formed on the belly and several shorter gaps 4 on the back.
  • this steam water mixture mixes with the steam water mixture which flows via the gaps or grooves 3 and 4 on the two side surfaces of the guide vanes 1 into the annular chamber 5 and from there via the channels 6 into the collecting chamber 7.
  • the pressure of the steam continuously supplied through the gap 8 and the channels 6 displaces the steam from the collecting chamber 7 through the blow gap 10 into the outer peripheral region of the diffuser.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP19900118119 1989-09-20 1990-09-20 Kreisringförmiger Diffusor für Dampfturbinen Expired - Lifetime EP0418887B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CS5359/89 1989-09-20
CS895359A CS275328B2 (en) 1989-09-20 1989-09-20 Annular diffuser for steam turbine

Publications (2)

Publication Number Publication Date
EP0418887A1 EP0418887A1 (de) 1991-03-27
EP0418887B1 true EP0418887B1 (de) 1994-03-16

Family

ID=5398355

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900118119 Expired - Lifetime EP0418887B1 (de) 1989-09-20 1990-09-20 Kreisringförmiger Diffusor für Dampfturbinen

Country Status (3)

Country Link
EP (1) EP0418887B1 (cs)
CS (1) CS275328B2 (cs)
DE (1) DE59005000D1 (cs)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5149248A (en) * 1991-01-10 1992-09-22 Westinghouse Electric Corp. Apparatus and method for adapting an enlarged flow guide to an existing steam turbine
US5257906A (en) * 1992-06-30 1993-11-02 Westinghouse Electric Corp. Exhaust system for a turbomachine
US5518366A (en) * 1994-06-13 1996-05-21 Westinghouse Electric Corporation Exhaust system for a turbomachine
US5494405A (en) * 1995-03-20 1996-02-27 Westinghouse Electric Corporation Method of modifying a steam turbine
DE19755982C2 (de) * 1997-12-17 2000-05-31 Abb Patent Gmbh Leitschaufeln zum Einsatz im Naßdampfbereich einer Dampfturbine
EP1561909A1 (de) * 2004-02-09 2005-08-10 Siemens Aktiengesellschaft Diffusor, Turbinenanlage und Verfahren zur Druckrückgewinnung bei einer Turbinenanlage
DE102010064450B3 (de) * 2010-01-20 2015-01-08 Gardner Denver Deutschland Gmbh Entspannungs-Turbine zur Entspannung von Gas
KR101671650B1 (ko) * 2012-07-11 2016-11-01 미츠비시 히타치 파워 시스템즈 가부시키가이샤 축류 배기 터빈
EP3653850B1 (en) 2018-11-16 2021-09-29 Doosan Skoda Power S.r.o. Exhaust diffuser for a steam turbine and corresponding steam turbine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3058720A (en) * 1960-11-10 1962-10-16 Westinghouse Electric Corp Moisture removing apparatus for steam turbine or the like
US3318077A (en) * 1963-10-16 1967-05-09 Zd Y V I Plzen Narodni Podnik Device for removing water from the stages of steam turbines

Also Published As

Publication number Publication date
CS535989A2 (en) 1991-04-11
EP0418887A1 (de) 1991-03-27
DE59005000D1 (de) 1994-04-21
CS275328B2 (en) 1992-02-19

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