EP0626536B1 - Dampferzeuger ausgerüstet mit einem Fremdpartikelfilter - Google Patents

Dampferzeuger ausgerüstet mit einem Fremdpartikelfilter Download PDF

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Publication number
EP0626536B1
EP0626536B1 EP94401140A EP94401140A EP0626536B1 EP 0626536 B1 EP0626536 B1 EP 0626536B1 EP 94401140 A EP94401140 A EP 94401140A EP 94401140 A EP94401140 A EP 94401140A EP 0626536 B1 EP0626536 B1 EP 0626536B1
Authority
EP
European Patent Office
Prior art keywords
steam generator
trapping
envelope
tubes
bundle
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
EP94401140A
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English (en)
French (fr)
Other versions
EP0626536A1 (de
Inventor
Yves Pascal
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.)
Areva NP SAS
Original Assignee
Framatome SA
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 Framatome SA filed Critical Framatome SA
Publication of EP0626536A1 publication Critical patent/EP0626536A1/de
Application granted granted Critical
Publication of EP0626536B1 publication Critical patent/EP0626536B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/002—Component parts or details of steam boilers specially adapted for nuclear steam generators, e.g. maintenance, repairing or inspecting equipment not otherwise provided for
    • F22B37/003—Maintenance, repairing or inspecting equipment positioned in or via the headers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/023—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers with heating tubes, for nuclear reactors as far as they are not classified, according to a specified heating fluid, in another group
    • F22B1/025—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers with heating tubes, for nuclear reactors as far as they are not classified, according to a specified heating fluid, in another group with vertical U shaped tubes carried on a horizontal tube sheet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers

Definitions

  • the invention relates to a steam generator adapted for use in a nuclear power plant.
  • a steam generator equipping a nuclear power plant usually comprises an envelope with a vertical axis, the interior space of which is divided into two parts , in the height direction, by a horizontal plate called “tube plate” (in English "tube sheet”).
  • the ends of the tubes of an inverted U-shaped tube bundle are fixed on the tube plate and open below it, respectively in an intake manifold and in a collector for evacuating the water circulating in the primary reactor circuit, called “primary water”.
  • the water circulating in the secondary circuit of the reactor called “secondary water” or “edible water” is injected into the part of the steam generator located above the tube plate.
  • This edible water vaporizes on contact with the tubes, due to the heat carried by the primary water.
  • the steam thus formed is extracted from the steam generator after having successively passed through cyclone separators placed in substantially vertical pipes, then dryers situated in the upper part of the envelope, above the pipes containing the cyclone separators.
  • Migrant bodies can also arrive in the tube bundle through the conduits of the cyclone separators connecting the part where the tube bundle is located to the dryers.
  • These migrant bodies coming from the dryer area are either objects such as a screw detaching from a dryer during operation, or objects introduced into the space located between the upper plate of the cyclone separators and the dryers during assembly or maintenance work in the generator and forgotten in the steam generator.
  • the subject of the invention is precisely a steam generator comprising a device making it possible to trap the migrant bodies coming from the dryers, in order to prevent them from being able to come to be caught between the tubes of the bundle.
  • the means for trapping migrant bodies can occupy either substantially the entire section of the envelope of the steam generator, or only be located above each of the pipes.
  • the means for trapping migrant bodies preferably comprise several trapping elements forming slabs, for example square, placed above a horizontal plate to which the upper ends of the conduits are fixed.
  • Each trapping element may in particular comprise a supporting structure forming a floor, on which a trapping grid is placed. This arrangement makes it possible to use the trapping means as a working floor during assembly or maintenance work.
  • Each trapping element is advantageously fixed, by removable and preferably captive fixing means such as bolts, on horizontal beams fixed above the above-mentioned horizontal plate and the outlets of the separators.
  • the reference 10 designates the outer envelope of revolution, of vertical axis, of a steam generator intended to ensure the transfer of heat between the primary water circuit and the secondary water / steam circuit of a pressurized water nuclear reactor.
  • This envelope 10 delimits an enclosed interior space which is separated into a primary lower zone and a secondary upper zone by a horizontal tube plate 12 tightly connected to the envelope 10.
  • a vertical partition 14 divides the primary lower zone, usually called “water box”, into an intake manifold 16 and an evacuation manifold 18 of the water flowing in the primary circuit (not shown) of the reactor.
  • a bundle of inverted U-shaped tubes 24 is tightly connected to the tube plate 12, in the secondary upper zone delimited by the latter. More precisely, the two ends of each of the tubes 24 open respectively into the intake manifold 16 and into the exhaust manifold 18. Thus, the primary water admitted into the steam generator through the intake manifold 16 circulates in the tubes 24 before leaving the device through the evacuation manifold 18.
  • the bundle of tubes 24 is surrounded and capped by an interior envelope 26 arranged coaxially in the exterior envelope 10.
  • the lower edge of the interior envelope 26 is placed at a predetermined distance above the tube plate 12, so to form a passage by which an annular space 28, delimited between the envelopes 10 and 26, communicates with a space 30 inside the envelope 26.
  • drinking water is introduced into the steam generator via a supply line 42 which passes radially through the outer envelope 10 at a level close to the upper part of the inner envelope 26, covering the bundle of tubes 24.
  • This supply line 42 opens into a manifold O-ring 44 centered on the vertical axis of the steam generator and provided over its entire periphery with inverted J-shaped tubes 46 by which the drinking water is injected into the top of the annular space 28.
  • the invention applies to steam generators of different structures and in particular to steam generators in which the introduction of drinking water takes place directly in the annular space 28, near the tube plate 12.
  • Drainage pipes 32 substantially vertical are connected by their lower end to the upper part of the inner casing 26, which covers the bundle of tubes 24.
  • the upper end of these drain pipes 32 is welded to a horizontal plate 34 whose peripheral edge is supported by the outer casing 10 of the steam generator.
  • Centrifugal or cyclone separators (not shown) are housed in each of the discharge pipes 32, in order to trap part of the water entrained by the steam, in order to recycle it towards the bottom part of the steam generator.
  • These centrifugal or cyclone separators are usually constituted by fixed fins, in the form of propellers, housed in the evacuation pipes 32.
  • the steam which reaches the upper part of the outer casing 10 through the discharge pipes 32 then passes through driers 36 placed at a certain distance above the horizontal plate 34, before leaving the steam generator by a secondary steam extraction pipe 38, disposed at the top of the outer casing 10, along the vertical axis of the steam generator.
  • the dryers 36 which can have various shapes, constitute a set of baffles which the steam must pass through before leaving the steam generator. These baffles help dry out the vapor by recycling part of the water entrained by the latter.
  • the recycling water thus recovered is brought back to the lower part of the steam generator by at least one substantially vertical pipe 40, which crosses the horizontal plate 34 and the lower end of which is situated at the above the upper part of the inner envelope 26 covering the bundle of tubes 24.
  • means 48 are provided above the horizontal plate 34 for trapping migrant bodies coming from the dryers 36.
  • the means 48 for trapping migrant bodies have the main function of retaining objects accidentally falling from the dryers 36, in order to prevent these objects from being able to become trapped between the tubes 24 after passing through the evacuation pipes 32.
  • the objects which may fall from the dryers 36 may be either objects inadvertently remaining in the dryers following the installation of the steam generator or subsequent intervention work, or objects accidentally detaching from the dryers in operation, such as screws .
  • the trapping means also retain objects that risk accidentally falling during intervention in the upper part of the steam generator.
  • the means 48 for trapping migrant bodies can also have the function of forming, in the upper part of the steam generator, a work floor facilitating interventions both during assembly work of the steam generator and during maintenance operations.
  • the means 48 for trapping migrant bodies can also contribute to improving the efficiency of the dryers 36, by interrupting the rotating movements of the steam at the outlet of the cyclone separators housed in the evacuation pipes 32.
  • the means 48 for trapping migrant bodies occupy substantially the entire horizontal section of the steam generator, above the horizontal plate 34. Since the migrant bodies cannot descend towards the tubes 24 of the bundle that, through the evacuation conduits 32, the means for trapping migrant bodies may also have a smaller cross-section, and, for example, be formed by separate assemblies placed at the top of each of the conduits d 'Evacuation 32. It is understood, however, that the means 48 for trapping migrant bodies can only constitute an effective working floor if they occupy the major part of the section of the steam generator as illustrated in FIG. 1.
  • the means 48 can effectively fulfill their function of trapping migrant bodies, they are advantageously in the form of a grid, the structure of which opposes as weakly as possible the escape of the steam towards the pipe 38 while guaranteeing the retention of objects whose size implies a risk of jamming between the tubes 24 of the bundle, if they reached the zone 30 inside the envelope 26.
  • this result is obtained by giving the meshes defined by the grid forming the means 48 for trapping migrant bodies a maximum dimension less than the minimum distance separating the tubes 24 from the beam.
  • the means 48 for trapping migrant bodies are advantageously formed by the juxtaposition of several trapping elements such as the element 50 in FIG. 2.
  • Each element 50 is then in the form of a slab, for example square, which rests on the horizontal plate 34 by means of beams 52.
  • These beams 52 bear at their ends on the outer casing 10 of the steam generator, in order to give the structure a sufficiently rigid character so that it constitutes a floor capable of supporting one or more people during assembly work or maintenance interventions.
  • Each of the trapping elements 50 is advantageously fixed to the beams 52 in a removable manner, for example using screws or studs 54 preferably made captive.
  • each trapping element 50 is formed of a support structure 56 forming a floor and a trapping grid 58 resting on the support structure 56.
  • the support structure 56 consists of a frame in which is fixed a large mesh grid giving the structure 56 sufficient mechanical rigidity so that it can support the intervention personnel.
  • the trapping grid 58 ensures the trapping function of the migrant bodies. It has for this purpose a mesh defining passages whose maximum dimension is less than the minimum distance separating the tubes 24 from the beam. In the embodiment illustrated in FIG. 2, the grid 58 has in itself insufficient mechanical characteristics to support the personnel called upon to intervene in the steam generator.
  • the trapping elements 50 are fixed edge to edge to form a paving as shown schematically in FIG. 2.
  • one or more trapping elements 50 can be placed above each of the evacuation pipes 32.
  • the means 48 for trapping migrant bodies can also be made in one piece over all or part of the section of the steam generator.
  • they can have any shape.
  • the structure ensuring the trapping of migrant bodies can also have sufficient mechanical rigidity to avoid the addition of a supporting structure.
  • the shape of the passages and the structure which delimits them is not limited to a grid but covers all the forms and structures making it possible to define passages of limited dimensions (circular, triangular, polygonal passages, etc., structures obtained by assembling plates, rods, etc. or by machining a solid part, etc. .).

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Separating Particles In Gases By Inertia (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)

Claims (6)

  1. Dampferzeuger, umfassend:
    - eine Hülle mit vertikaler Achse;
    - eine horizontale Röhrenplatte (12), dicht im Innern der Hülle befestigt;
    - ein Bündel aus einem umgekehrten U entsprechenden Rohren (24), von denen jedes mit seinen Enden in der Röhrenplatte befestigt ist und unter dieser letzteren mündet, jeweils in einem Eintrittssammler (16) und in einen Austrittssammler (18) des Primärfluids;
    - Sekundärwasser-Zuleitungseinrichtungen (42,44), in der Hülle (10) über der horizontalen Röhrenplatte (12) mündend; und
    - Sekundärdampf-Ableitungseinrichtungen (32,36,38), in der Hülle (10) über dem Rohrbündel (24) angebracht und im wesentlichen vertikale Abführleitungen (32) umfassend, angebracht unterhalb Trocknungseinrichtungen (36);
    dadurch gekennzeichnet, daß Fremdpartikel-Fangeinrichtungen (48) zwischen den Ableitungseinrichtungen (32) und den Trocknungseinrichtungen (36) angeordnet sind, wenigstens über jeder der Abführleitungen (32), wobei die Fremdpartikel-Fangeinrichtungen (48) Durchlässe abgrenzen, deren größte Abmessung kleiner ist als der die Rohre (24) des Bündels trennende Mindestabstand.
  2. Dampferzeuger nach Anspruch 1, dadurch gekennzeichnet, daß die Fremdkörper-Fangeinrichtungen (48) im wesentlichen den ganzen Querschnitt der Hülle (10) einnehmen.
  3. Dampferzeuger nach Anspruch 1, dadurch gekennzeichnet, daß die Fremdkörper-Fangeinrichtungen (48) durch verschiedene Einheiten gebildet werden, angebracht im Innern des oberen Teils von jeder der Abführleitungen (32).
  4. Dampferzeuger nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Fremdpartikel- Fangeinrichtungen (48) mehrer Fangelemente (50) umfassen, angeordnet über einer horizontalen Platte (34), an der obere Enden der Abführleitungen (32) befestigt sind.
  5. Dampferzeuger nach Anspruch 4, dadurch gekennzeichnet, daß jedes Fangelement (50) eine einen Boden bildendende Tragstruktur (56) umfaßt, auf der ein Fanggitter (58) angebracht ist.
  6. Dampferzeuger nach einem der Ansprüche 4 und 5, dadurch gekennzeichnet, daß jedes Fangelement (50) durch demontierbare Befestigungseinrichtungen (54) auf horizontalen Trägern (52) befestigt ist, die sich über der genannten horizontalen Platte (34) befinden.
EP94401140A 1993-05-27 1994-05-24 Dampferzeuger ausgerüstet mit einem Fremdpartikelfilter Expired - Lifetime EP0626536B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9306372 1993-05-27
FR9306372A FR2705759B1 (fr) 1993-05-27 1993-05-27 Générateur de vapeur équipé d'un dispositif de piégeage de corps migrants.

Publications (2)

Publication Number Publication Date
EP0626536A1 EP0626536A1 (de) 1994-11-30
EP0626536B1 true EP0626536B1 (de) 1997-08-27

Family

ID=9447512

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94401140A Expired - Lifetime EP0626536B1 (de) 1993-05-27 1994-05-24 Dampferzeuger ausgerüstet mit einem Fremdpartikelfilter

Country Status (6)

Country Link
US (1) US5566647A (de)
EP (1) EP0626536B1 (de)
KR (1) KR100318170B1 (de)
CN (1) CN1071878C (de)
ES (1) ES2108392T3 (de)
FR (1) FR2705759B1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2778222B1 (fr) 1998-05-04 2000-07-21 Framatome Sa Dispositif de filtration et d'arret de corps etrangers vehicules par l'eau d'alimentation d'un generateur de vapeur
DE10218313B4 (de) * 2002-04-24 2018-02-15 Arnold & Richter Cine Technik Gmbh & Co. Betriebs Kg Digitale Laufbildkamera
FR2851031B1 (fr) * 2003-02-12 2005-05-06 Framatome Anp Generateur de vapeur comportant un dispositif de fourniture d'eau d'alimentation realisant le piegeage de corps etrangers
US7434546B2 (en) * 2006-11-28 2008-10-14 Westinghouse Electric Co. Llc Steam generator loose parts collector weir
TW201121783A (en) 2009-07-23 2011-07-01 Setec Pty Ltd Multilayer film
KR101194748B1 (ko) 2011-06-24 2012-10-25 강림중공업 주식회사 폐열보일러의 배기가스 배출용 원형댐퍼 장치
CN104014202B (zh) * 2014-05-15 2016-02-03 华东理工大学 压水堆核电站蒸汽发生器中组合汽-液分离方法及装置
CN112833381B (zh) * 2020-12-25 2022-05-20 华电电力科学研究院有限公司 一种蒸汽吹管集粒器及其使用方法

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3507099A (en) * 1966-10-25 1970-04-21 Combustion Eng Centrifugal liquid-vapor separator
US3503440A (en) * 1968-12-23 1970-03-31 Combustion Eng Formed plate tube support
US3735569A (en) * 1971-09-07 1973-05-29 Combustion Eng Water-steam separator
GB1475222A (en) * 1974-06-21 1977-06-01 Westinghouse Electric Corp Steam generator including moisture separator
US3906905A (en) * 1974-08-20 1975-09-23 Commissariat Energie Atomique Steam generator
US4318368A (en) * 1980-12-29 1982-03-09 Combustion Engineering, Inc. Orificing of steam separators for uniform flow distribution in riser area of steam generators
FR2507742A1 (fr) * 1981-06-16 1982-12-17 Commissariat Energie Atomique Generateur de vapeur muni d'un dispositif de purge dynamique
US4554889A (en) * 1984-06-22 1985-11-26 Westinghouse Electric Corp. Hybrid preheat/recirculating steam generator
DE3573827D1 (en) * 1984-11-15 1989-11-23 Westinghouse Electric Corp Perforated flow distribution plate
FR2616883B1 (fr) * 1987-06-18 1990-03-30 Framatome Sa Bac d'epuration d'eau de generateur de vapeur

Also Published As

Publication number Publication date
EP0626536A1 (de) 1994-11-30
ES2108392T3 (es) 1997-12-16
KR950033240A (ko) 1995-12-22
CN1097855A (zh) 1995-01-25
FR2705759A1 (fr) 1994-12-02
US5566647A (en) 1996-10-22
FR2705759B1 (fr) 1995-07-07
CN1071878C (zh) 2001-09-26
KR100318170B1 (ko) 2002-05-13

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