EP0648974B1 - Dampferzeuger mit radialer Haltevorrichtung für die Rohrbündelhülle und die Rohrabstandsplatten - Google Patents

Dampferzeuger mit radialer Haltevorrichtung für die Rohrbündelhülle und die Rohrabstandsplatten Download PDF

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Publication number
EP0648974B1
EP0648974B1 EP94402296A EP94402296A EP0648974B1 EP 0648974 B1 EP0648974 B1 EP 0648974B1 EP 94402296 A EP94402296 A EP 94402296A EP 94402296 A EP94402296 A EP 94402296A EP 0648974 B1 EP0648974 B1 EP 0648974B1
Authority
EP
European Patent Office
Prior art keywords
envelope
steam generator
bundle
axis
pressure
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
EP94402296A
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English (en)
French (fr)
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EP0648974A1 (de
Inventor
Gil Cornic
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
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Filing date
Publication date
Application filed by Framatome SA filed Critical Framatome SA
Publication of EP0648974A1 publication Critical patent/EP0648974A1/de
Application granted granted Critical
Publication of EP0648974B1 publication Critical patent/EP0648974B1/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
    • 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
    • F22B37/10—Water tubes; Accessories therefor
    • F22B37/20—Supporting arrangements, e.g. for securing water-tube sets
    • F22B37/205—Supporting and spacing arrangements for tubes of a tube bundle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/06—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits having a single U-bend
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/005—Other auxiliary members within casings, e.g. internal filling means or sealing means

Definitions

  • the present invention relates to a steam generator comprising a device radial support of the beam envelope and spacer plates of the steam generator according to the preamble of claims 1 and 4.
  • a steam generator is described in document US-A-4,503,903.
  • Heat exchangers such as steam generators of a water nuclear reactor under pressure have a tube bundle made up by a very large number of small diameter tubes arranged vertically inside an envelope of generally cylindrical shape itself disposed inside the envelope under rigid pressure external thickness of the steam generator.
  • Pressurized water from the nuclear reactor circulates inside the small diameter tubes and the water to be vaporized is introduced inside the envelope of the bundle where it comes into contact with the outer surface of the tubes. Steam is recovered at the top of the beam envelope then it is generally dried in separators steam-water arranged in the outer envelope of the steam generator above the envelope of the beam.
  • Steam generators are very tall units in which the different coaxial envelopes are arranged with generally small radial spacing.
  • spacer plates through which the bundle tubes pass, distributed depending on the height of the beam, to maintain the tubes in fixed radial positions one by compared to others. These spacer plates are connected between them by vertical tie rods, the assembly being placed inside the bundle envelope.
  • This radial support is obtained by stops attached to the bundle envelope at the spacer plates and at the rate of several stops by spacer plate. These stops are then regularly distributed around the periphery of spacer plates.
  • stops have the disadvantage of occupying much of the width of the placeholder between the beam envelope and the external envelope and thus appreciably limit the section of passage for the water to vaporize circulating in this space without ensuring a perfect seal.
  • stops also have the disadvantage of requiring the introduction of wedging parts in notches machined at the peripheral part of spacer plates. These notches decrease accordingly the distance between the peripheral tubes of the beam and the edge of the spacer plates. If we want maintain sufficient distance between tubes peripherals and plaque, then you have to decrease the number of tubes in the bundle.
  • the stops must have shapes that do not facilitate their fixing by welding in the wall of the envelope beam.
  • the invention therefore relates to a generator of steam comprising a pressure envelope of form stretched along a given axis, a bundle envelope steam generator tubes, also shaped elongated along the same axis and contained in the envelope pressure so as to leave an annular space between the two envelopes, spacer plates being arranged at given intervals and transversely to said axis in the beam envelope for supporting said tubes by means of a device holding device, the holding device being constituted of stops passing through the wall of the bundle envelope and fixed to this wall at the level of spacer plates, the stops being distributed at the periphery of each spacer plate to separate radially the envelope beam of the envelope pressure and to exercise maintenance constraints rigid between the spacer plates and the casing beam, each stop comprising a first part attached to the beam casing and comprising means allowing their possible sliding on the face internal pressure envelope along said axis and means for varying their radial dimension with respect to said axis, each stop also comprising a second part which can be moved radially relative to to the first room and having
  • the first part comprises a cavity in which the second part is housed forming a piston in this cavity, said fluid being introduced into the cavity, in the space between the first room and the second room. This facilitates assembly operations of the steam generator.
  • This fluid can be introduced through a conduit crossing the second room.
  • the invention also relates to a generator of steam including a pressure envelope of elongated shape given axis, an envelope of the bundle of tubes of the steam generator, also elongated according to the same axis and contained in the pressure envelope so as to leave an annular space between the two envelopes, with spacer plates arranged at given intervals and across the audit axis in the beam envelope to support said beams tubes by means of a holding device, the holding device consisting of stops crossing the wall of the bundle envelope and fixed at this wall at the level of the spacer plates, the stops being distributed around the periphery of each spacer plate to radially separate the casing pressure envelope beam and to exercise rigid support constraints between spacer plates and the bundle shell, each stop comprising a first part fixed on the beam envelope and comprising means allowing their possible sliding on the internal face the pressure envelope along said axis and means to vary their radial dimension with respect said axis, each stop also comprising a second part that can be moved radially relative to to the first room and having means to exercise said rigid
  • These elastic means may include a spring arranged between the first part and the second room.
  • the means allowing the possible sliding of a stop on the internal face of the pressure envelope and the means to make vary their radial dimension are constituted by at minus a screw screwed into the first part, the contact between said screw and the inner face of the envelope pressure taking place at a convex end of the opinion.
  • Figure 1 which is an axial sectional view, we see a steam generator whose external envelope 1, resistant to pressure, contains in its lower part of smaller diameter a tubular bundle 2 comprising a set of bent tubes in the shape of an inverted U. These tubes are traversed by pressurized water forming part of the primary circuit and introduced into the steam generator under the tubular plate 3 by an inlet orifice 4. The pressurized water traverses the tubes of the tubular bundle 2 then returns under the tube plate 3 to exit through the orifice 5.
  • the tubular bundle 2 is surrounded, until near its lower part, by an envelope of beam 6 constituting the vaporization enclosure inside which the food water in contact with the tube bundle 2, traversed by water at high temperature coming from the reactor core, gradually vaporizes while rising inside of enclosure 6.
  • the tallest part of the dome of steam is provided with a steam outlet 7 towards the turbine.
  • a non-potable water supply device depicted keeps water level 8 food in the steam generator to a certain distance above tube bundle 2 and below cyclones 10 constituting the first stage of the vapor separator and communicating with the top of the vaporization enclosure 6 via the tubular columns 11. These tubular columns are welded to the roof 9 of the vaporization enclosure 6 and allow communication with the interior of this enclosure. This food water goes first in the space between the outer envelope 1 and enclosure 6 to reach the lower end of this enclosure.
  • the vapor which has abandoned most of the entrained water, passes through the secondary separators 12 formed by baffles allowing more complete drying steam before exiting through port 7.
  • Beam tubes are held laterally by spacer plates 13 arranged transversely inside the envelope of harness 6. Tie rods 14 attached to their part lower on the tube plate 1 allow maintain the axial spacing of the spacer plates 13.
  • Figure 2 is an enlargement of the area marked II in Figure 1. It allows you to see one retaining stops for a spacer plate 13.
  • the stop 15 is fixed to the bundle envelope 6.
  • the casing 6 is pierced a radial opening 16 allowing passage and fixing a structure comprising a sheath radial 17 welded to the casing 6 by one of its ends and slightly protruding in space ring between pressure envelope 1 and the beam envelope 6.
  • the structure further comprises an annular plate 18 welded to the end of the sheath 17 which is in the annular space and partially closing the sheath 17.
  • the structure finally includes a second sheath 19 placed in alignment of the first sleeve 17 and welded to the edge of the hole in the annular plate 18.
  • the stop includes a shaped part 20 general cylindrical which is engaged in the structure described above until contact with the internal wall of the pressure envelope 1.
  • the part 20 comprises a portion 21 of large diameter, this diameter being very slightly smaller than the inside diameter of the sheath 17, and a portion 22 of small diameter, this diameter being slightly less than the diameter inside of the sheath 19.
  • the face of the part 20 directed inward of the bundle envelope 6 is machined to constitute a bearing surface 23 inclined by relative to the vertical of an angle close to 5 °. The angle of inclination of this bearing surface corresponds to the machining angle of the shims 24 interposed between the spacer plate 13 and part 20.
  • the end of part 22 of part 20 directed to the pressure casing is machined to constitute a spherical bearing surface on the envelope pressure.
  • the parts 20 are placed in their housings and contact with pressure casing 1. Each part 20 is then welded by a circular weld bead 25 on the inner face of the sheath 17. Next comes place and weld a set of shims 24 between the surface support 23 and the edge of the spacer plate 13 for provide rigid support between spacer plates and the bundle casing.
  • FIGS 3 and 4 illustrate a first variant.
  • a first circular piece 31 is fixed by a weld bead 34 on a axial and circular opening made on the envelope beam 6 at a spacer plate 13. This part occupies part of the annular space 33 separating the two envelopes.
  • the welding of the first piece 31 of each stop on the envelope of beam is made prior to assembly operations of the steam generator.
  • the first part 31 has in its center a circular cavity 35 on the inside of the generator steam.
  • the peripheral part of part 31, in crown shape 37, has four threaded holes 36 regularly arranged on this crown. In these threaded holes 36, we screw four screws 38 for the adjusting the position of the beam envelope 6 with respect to the pressure envelope 1. The contact between the pressure jacket and each end of the screw 38 is made on a curved face 39.
  • the second part 32 acts as a piston in the cavity 35 of the first Exhibit 31. It is intended to come to bear on the spacer plate 13 by its rear face 41.
  • a conduit 42 passes right through the part 32, connecting the rear face 41 of this part to the cavity 35.
  • the duct 42 communicates with the face rear 41 through an orifice 43 adapted to receive a nozzle compressed air supply.
  • the bundle envelope 6 is positioning in the pressure envelope 1 in respecting the spacing required between the two envelopes by means of rods through a hole provided for this purpose in the beam envelope.
  • Screws 38 for example of the hexagon socket type, are then adjusted by means of an Allen key to get into contact with the wall internal pressure envelope. They can then be stopped by a welding point made between each of the screws 38 and the first part 31.
  • the piston 32 is introduced into the cavity 35, then brought into contact with the spacer plate 13, duly positioned, by inflation.
  • the inflation can be done by compressed air under a pressure of 7 bars.
  • the position obtained is then stopped using a weld bead 44 connecting the parts 31 and 32.
  • Figure 5 illustrates a second variant of achievement.
  • the elastic pressure intended to put the part 32 in contact with the spacer plate 13 in this case is ensured by a coil spring 45 housed in cavity 35.

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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)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Claims (8)

  1. Dampferzeuger mit einer Druckhülle (1) länglicher Form entlang einer gegebenen Achse, einer Rohrbündelhülle des Dampferzeugers, ebenfalls länglicher Form entlang derselben Achse und in der Druckhülle derart enthalten, einen Ringraum zwischen den zwei Hüllen zu lassen, Abstandsplatten (13), die in gegebenen Abständen und quer zu der genannten Achse in der Bündelhülle angeordnet sind, um die genannten Rohre mittels einer Haltevorrichtung zu halten, wobei die Haltevorrichtung von Anschlägen gebildet ist, die die Wand der Bündelhülle durchqueren und an dieser Wand auf der Höhe der Abstandsplatten befestigt sind, wobei die Anschläge über den Umfang einer jeden Abstandsplatte verteilt sind, um die Bündelhülle von der Druckhülle radial zu trennen und eine starre Lagespannung zwischen den Abstandsplatten und der Bündelhülle auszuüben, wobei jeder Anschlag ein erstes Teil (31) umfaßt, das an der Bündelhülle (6) angebracht ist und Mittel, die seine etwaige Verschiebung auf der Innenseite der Druckhülle entlang der genannten Achse erlauben, und Mittel aufweist, um ihre radiale Abmessung in bezug auf die genannte Achse zu ändern, wobei jeder Anschlag auch ein zweites Teil (32) umfaßt, das radial in bezug auf das erste Teil verschiebbar ist und Mittel besitzt, um die genannte Zwangskraft zur starren Halterung auf die Abstandsplatte auszuüben, wobei Befestigungsmittel vorgesehen sind, um das zweite Teil (32) in bezug auf die Bündelhülle nach der Herstellung einer Berührung des zweiten Teils (32) und der Abstandsplatte (13) festzulegen, dadurch gekennzeichnet, daß jeder Anschlag Mittel umfaßt, um das zweite Teil (32) mit der entsprechenden Abstandsplatte (13) durch Einführung eines Fluids zwischen das zweite Teil (32) und das erste Teil (31) in Berührung zu bringen.
  2. Dampferzeuger gemäß Anspruch 1, dadurch gekennzeichnet, daß das erste Teil (31) einen Hohlraum (35) umfaßt, in dem das zweite Teil (32) untergebracht ist, das einen Kolben in diesem Hohlraum bildet, wobei das Fluid in den Hohlraum, in den sich zwischen dem ersten Teil (31) und dem zweiten Teil (32) befindenden Raum, eingebracht wird.
  3. Dampferzeuger gemäß Anspruch 2, dadurch gekennzeichnet, daß das genannte Fluid durch eine das zweite Teil (32) durchquerende Leitung (42) eingebracht wird.
  4. Dampferzeuger mit einer Druckhülle (1) länglicher Form entlang einer gegebenen Achse, einer Rohrbündelhülle des Dampferzeugers, ebenfalls länglicher Form entlang derselben Achse und in der Druckhülle derart enthalten, einen Ringraum zwischen den zwei Hüllen zu lassen, Abstandsplatten (13), die in gegebenen Abständen und quer zu der genannten Achse in der Bündelhülle angeordnet sind, um die genannten Rohre mittels einer Haltevorrichtung zu halten, wobei die Haltevorrichtung von Anschlägen gebildet ist, die die Wand der Bündelhülle durchqueren und an dieser Wand auf der Höhe der Abstandsplatten befestigt sind, wobei die Anschläge über den Umfang einer jeden Abstandsplatte verteilt sind, um die Bündelhülle von der Druckhülle radial zu trennen und eine starre Lagespannung zwischen den Abstandsplatten und der Bündelhülle auszuüben, wobei jeder Anschlag ein erstes Teil (31) umfaßt, das an der Bündelhülle (6) angebracht ist und Mittel, die seine etwaige Verschiebung auf der Innenseite der Druckhülle entlang der genannten Achse erlauben, und Mittel aufweist, um ihre radiale Abmessung in bezug auf die genannte Achse zu ändem, wobei jeder Anschlag auch ein zweites Teil (32) umfaßt, das radial in bezug auf das erste Teil verschiebbar ist und Mittel besitzt, um die genannte Zwangskraft zur starren Halterung auf die Abstandsplatte auszuüben, wobei Befestigungsmittel vorgesehen sind, um das zweite Teil (32) in bezug auf die Bündelhülle nach der Herstellung einer Berührung des zweiten Teils (32) und der Abstandsplatte (13) festzulegen, dadurch gekennzeichnet, daß das die Mittel, um die radiale Abmessung in bezug auf die genannte Achse zu ändern, von elastischen Mitteln gebildet sind, die das zweite Teil (32) mit dem ersten Teil (31) verbinden und dazu neigen, das zweite Teil von diesem ersten Teil in einer radialen Richtung in bezug auf die genannte Achse zwischen einer ersten Position, die einer minimalen radialen Abmessung des Anschlags entspricht, und einer zweiten Position zu beabstanden, die der Berührung mit der Abstandsplatte entspricht.
  5. Dampferzeuger gemäß Anspruch 4, dadurch gekennzeichnet, daß die elastischen Mittel eine Feder (45) umfassen, die zwischen dem ersten Teil (31) und dem zweiten Teil (32) angeordnet ist.
  6. Dampferzeuger gemäß irgendeinem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Mittel, die die etwaige Verschiebung eines Anschlags auf der Innenseite der Druckhülle erlauben, und die Mittel, um ihre radiale Abmessung zu ändern, von wenigstens einer Schraube (38) gebildet sind, die in das erste Teil (31) geschraubt ist, wobei die Berührung zwischen der genannten Schraube (38) und der Innenseite der Druckhülle (1) mit einem gewölbten Ende (39) der Schraube erfolgt.
  7. Dampferzeuger gemäß irgendeinem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Befestigungsmittel durch eine Schweißung gebildet sind, die zwischen dem ersten Teil (31) und dem zweiten Teil (32) ausgeführt ist.
  8. Dampferzeuger gemäß irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Berührung zwischen dem zweiten Teil (32) und der Abstandsplatte (13) entlang einer großen Seite des zweiten Teils erfolgt, die auf die Schmalseite der Abstandsplatte einen Druck ausübt.
EP94402296A 1993-10-14 1994-10-12 Dampferzeuger mit radialer Haltevorrichtung für die Rohrbündelhülle und die Rohrabstandsplatten Expired - Lifetime EP0648974B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9312217A FR2711223B1 (fr) 1993-10-14 1993-10-14 Dispositif de maintien radial de l'enveloppe de faisceau et des plaques entretoises d'un générateur de vapeur par des butées à positionnement élastique.
FR9312217 1993-10-14

Publications (2)

Publication Number Publication Date
EP0648974A1 EP0648974A1 (de) 1995-04-19
EP0648974B1 true EP0648974B1 (de) 1998-12-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP94402296A Expired - Lifetime EP0648974B1 (de) 1993-10-14 1994-10-12 Dampferzeuger mit radialer Haltevorrichtung für die Rohrbündelhülle und die Rohrabstandsplatten

Country Status (7)

Country Link
US (1) US5497827A (de)
EP (1) EP0648974B1 (de)
KR (1) KR100334152B1 (de)
CN (1) CN1111740A (de)
DE (1) DE69415467T2 (de)
FR (1) FR2711223B1 (de)
TW (1) TW270206B (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6401803B1 (en) 2000-12-13 2002-06-11 The Atlantic Group, Inc. Stake for tube bundle
US9506701B2 (en) * 2006-05-29 2016-11-29 Webasto Ag Cold and/or heat accumulator
US8549748B2 (en) * 2008-07-25 2013-10-08 Babcock & Wilcox Canada Ltd. Tube support system for nuclear steam generators
US8572847B2 (en) * 2008-07-25 2013-11-05 Babcock & Wilcox Canada Ltd. Tube support system for nuclear steam generators
US20100276550A1 (en) * 2009-04-29 2010-11-04 Klarner Richard G Tube support structure
CN102161143A (zh) * 2011-04-01 2011-08-24 上海电气核电设备有限公司 一种用于蒸汽发生器管束的抗震条装配辅助工装
EP2843304A1 (de) 2013-08-29 2015-03-04 Casale SA Rohrbündelvorrichtung zur Wärmerückgewinnung aus einem heißen Prozessstrom
JP6579768B2 (ja) * 2015-03-24 2019-09-25 三菱日立パワーシステムズ株式会社 ボイラ
CN107388584B (zh) * 2017-08-25 2023-07-11 东方电气集团东方锅炉股份有限公司 一种阔通流的加热器导流装置

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
US4336614A (en) * 1978-09-19 1982-06-22 Nuclear Power Company Limited Tube-in-shell heat exchangers
US4415021A (en) * 1981-08-17 1983-11-15 Westinghouse Electric Corp. Positioning a thin wall round wrapper within a heavy wall out-of-round shell of a heat exchanger
US4503903A (en) * 1982-07-06 1985-03-12 Westinghouse Electric Corp. Heat exchanger tube sheet radial support
US4596689A (en) * 1982-08-27 1986-06-24 Ga Technologies Inc. Lateral restraint assembly for reactor core
FR2562996B1 (fr) * 1984-04-11 1986-06-20 Framatome Sa Echangeur de chaleur comportant un faisceau de tubes dispose dans une enveloppe de faisceau cylindrique maintenue radialement a l'interieur d'une enveloppe cylindrique externe
US4583584A (en) * 1984-10-19 1986-04-22 Westinghouse Electric Corp. Seismic snubber accommodating variable gaps in pressure vessels
DE3662461D1 (en) * 1985-01-23 1989-04-20 Westinghouse Electric Corp Steam generator wrapper accommodating tube support members of high thermal expansion coefficient material
US4690206A (en) * 1985-07-22 1987-09-01 Westinghouse Electric Corp. Nuclear steam generator wrapper barrel/tube support plate connection assembly and radial tuning method for assembling same

Also Published As

Publication number Publication date
DE69415467T2 (de) 1999-06-24
TW270206B (de) 1996-02-11
CN1111740A (zh) 1995-11-15
FR2711223A1 (fr) 1995-04-21
DE69415467D1 (de) 1999-02-04
FR2711223B1 (fr) 1995-11-03
US5497827A (en) 1996-03-12
KR960015602A (ko) 1996-05-22
EP0648974A1 (de) 1995-04-19
KR100334152B1 (ko) 2002-11-27

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