EP0186957B1 - Schwingungsneutralisierende Stangen für einen Nukleardampferzeuger - Google Patents

Schwingungsneutralisierende Stangen für einen Nukleardampferzeuger Download PDF

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Publication number
EP0186957B1
EP0186957B1 EP85308234A EP85308234A EP0186957B1 EP 0186957 B1 EP0186957 B1 EP 0186957B1 EP 85308234 A EP85308234 A EP 85308234A EP 85308234 A EP85308234 A EP 85308234A EP 0186957 B1 EP0186957 B1 EP 0186957B1
Authority
EP
European Patent Office
Prior art keywords
vibration
tubes
vibration bars
bars
tube 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
Application number
EP85308234A
Other languages
English (en)
French (fr)
Other versions
EP0186957A1 (de
Inventor
Byre Venkataramana Gowda
Robert Mcconaughty Wilson
Robert Mackness Wepfer
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.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Publication of EP0186957A1 publication Critical patent/EP0186957A1/de
Application granted granted Critical
Publication of EP0186957B1 publication Critical patent/EP0186957B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • 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
    • F22B37/206—Anti-vibration supports for the bends of U-tube steam generators
    • 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
    • F28F9/007—Auxiliary supports for elements
    • F28F9/013—Auxiliary supports for elements for tubes or tube-assemblies
    • F28F9/0132—Auxiliary supports for elements for tubes or tube-assemblies formed by slats, tie-rods, articulated or expandable rods

Definitions

  • This invention relates to mechanisms for supporting the tubes of a nuclear steam generator to prevent vibration and, more particularly, to anti-vibration bars as disposed between rows of the tubes of a nuclear steam generator.
  • This invention relates to a novel method of installing and design of anti-vibration bars installed in the U-bend region of the tube bundle of nuclear steam generators to control tube vibration caused by the steam/water mixture flowing by the U-shaped tubes.
  • the U-shaped tubes would vibrate and, if not controlled, would leak resulting in the loss of the primary coolant into the steam supplied to the turbine generator.
  • Anti-vibration bars of the prior art are typically of uniform cross-section, e.g., square or cylinder.
  • the U-shaped tubes are of substantially uniform cylindrical cross-section with the result that there is a gap/clearance between the anti-vibration bars and the U-shaped tubes. Gaps between the U-shaped tubes and the anti-vibration bars are not desirable for tube performance or from a reliability point of view and are difficult to make small.
  • the U-shaped tubes and the anti-vibration bars have dimensioned tolerances and are assembled such that close contact therebetween is difficult to maintain. For example, normal tolerances occur in the outer diameters of the anti-vibration bars and the U-shaped tubes.
  • the forming of the U-shaped tubes results in oval cross-sections in their bend areas and their straight portions may not be aligned precisely parallel with each other. Further, the openings within the tube support plate 14 may not be precisely spaced so that the spacing between adjacent U-shaped tubes in the region of their bends may not be uniform.
  • the present invention relates to a method of forming and installing anti-vibration bars into a tube bundle of a steam generator, which tube bundle is comprised of rows of tubes, each of which carries a high temperature coolant, with each of said anti-vibration bars having a tubular configuration and being disposed between adjacent rows of said tube bundle for stabilizing said tubes so as to prevent vibration thereof, wherein after insertion of said anti-vibration bars between adjacent rows of said tube bundle a pressurized fluid is admitted to said anti-vibration bars, and said anti-vibration bars are expanded thereby to minimize any gaps between said anti-vibration bars and the tubes of adjacent rows.
  • a pressurized fluid is admitted to said anti-vibration bars, and said anti-vibration bars are expanded thereby to minimize any gaps between said anti-vibration bars and the tubes of adjacent rows.
  • a nuclear steam generator 8 of the type found in the prior art is shown in Figures 1A and 1B of the attached drawings, as comprising a bundle 11 of a large number of vertically oriented U-shaped tubes 13.
  • the tubes 13 are disposed in a lower, cylindrically shaped shell 9 of the steam generator 8, whose bottom end is associated with a channel head 17, typically of a hemi-spherical configuration as shown in Figure 1A.
  • the channel head 17 is divided by a partition 18 into a first half typically known as a hot leg 20, and a second half typically known as a cold leg 22.
  • the high-temperature coolant water from the nuclear reactor is introduced into the steam generator 8, through a primary coolant inlet 24 into the hot leg 20.
  • the high-temperature coolant passes from the hot leg 20 into the exposed openings of the plurality of U-shaped tubes 13, passing therethrough to be introduced into the cold leg 22 and, finally, exiting from the steam generator 8 through a primary coolant outlet 26.
  • the steam generator 8 further includes a steam drum section 32 comprising an upper shell 30, which contains a moisture separator 34.
  • Feedwater enters the steam generator 8 through inlet nozzle 28 disposed in the upper shell 30 to be distributed and mixed with the water removed by the moisture separator 34.
  • This feedwater travels down an annular channel surrounding the tube bundle 11 and is introduced into the bottom of the tube bundle 11.
  • the mixture of feedwater and recirculating water boils as the high temperature coolant is circulated through the U-shaped tubes 13 of the tube bundle 11.
  • the steam so produced rises into the steam drum section 32.
  • the moisture separator 34 removes the entrained water from the steam before the steam exits from the steam generator 8 through a steam outlet 36 to a turbine generator (not shown).
  • the U-shaped tubes 13 are supported in the configuration of the tube bundle 11 by a series of lower tube supports 12 and an upper tube support plate 14.
  • the upper tube support assembly 14 comprises a plurality of retainer rings 16a, 16b and 16c.
  • each of the retainer rings 16 is of generally oval configuration.
  • the major and minor diameters of the retainer rings 16a, b and c are progressively smaller, noting that the retainer 16c is disposed at the upper-most portion of the tube bundle 11.
  • a plurality of sets of anti-vibration bars 15 is disposed between adjacent rows of the U-shaped tubes 13.
  • Each of the anti-vibration bars 15a, 15b and 15c is of a V-shaped configuration with the ends thereof extending to the circumference of the tube bundle 11 and connected to a corresponding one of the retainer rings 16.
  • one end of the anti-vibration bar 15a is secured as by tack-welding to the retainer ring 16a and, in similar fashion, the other end of the anti-vibration bar 15a is secured to the same retainer ring 16a.
  • Figure 1B illustrates a cross-sectioned view taken through the tube bundle 11 showing that the anti-vibration bars 15a, 15b and 15c are disposed to support the upper ends of the U-shaped tubes 13, noting the arrangement of the U-shaped tubes 13a to 13n in a row.
  • test rig 40 for receiving and imparting a series of indentations 50 to an anti-vibration bar 15.
  • the test rig 40 comprises an upper plate 42a, front and back plates 42d and 42b and a lower plate 42c, rigidly held together by bolts as shown.
  • the upper plate 42b has first and second rows of openings 46 and 48, for respectively receiving first and second rows of test tubes 13" and 13'.
  • the anti-vibration bar 15 is disposed between the first and second rows of test tubes 13' and 13".
  • Each of the first set of openings 48 has a configuration and dimension substantially similar to those of the test tubes 13 for rigidly disposing the test tubes 13, whereas each of the second set of openings 46 is of substantially oval configuration to permit the second set of test tubes 13" to be directed toward the first rows of test tube 13' whereby the spacings between corresponding pairs of the test tubes 13' and 13" may be variably set, thus duplicating the inconsistent spacings between U-shaped tubes 13 of a typical tube bundle 11.
  • a set of micrometer heads 44a, 44b and 44c may be manually rotated to variably set the spacings between opposing test tubes 13' and 13".
  • the oval-shaped, tubular anti-vibration bars 15 have initially a uniform minor diameter before they are compressed as will be explained.
  • the anti-vibration bars 15 of this invention are tubular in character to permit their deformation by the application of fluidized pressure, whereby a minimum gap contact is achieved with the U-shaped tubes 13, thus improving the vibration support provided to these tubes 13.
  • a series of indentations 50a, 50b and 50c, etc. is provided in the anti-vibration bar 15 by applying a pressurized fluid thereto.
  • the diameter B along the minor axis of the oval-shaped anti-vibration bar 15 is shown in Figure 4 before the application of pressure.
  • opposing indentations 50a, 50b, 50c, etc. are imparted to the anti-vibration bar 15 and the minor diameter A of the anti-vibration bar 15 therebetween is slightly increased by the application of pressurized fluid with respect to the minor diameter B.
  • the application of the fluidized pressure increases significantly the minor diameter C of the deformed anti-vibration bar 15 at a point approximately midway between adjacent indentations 50. It is realized that deformation may increase slightly the minor diameter A from the original minor diameter B.
  • the surfaces of the indentations 50 tend to conform to the configuration of the opposing test tubes 13' and 13", whereby the size of the gap between the anti-vibration bars 15 and the tubes is minimized.
  • FIG. 7 illustrates an anti-vibration bar 15 disposed between first and second rows of the test tubes 13' and 13" as supported by the test rig 40 as explained above.
  • a pump 72 supplies a regulated, pressurized fluid, such as water, to the anti-vibration bar 15, whereby the anti-vibration bar 15 is expanded and a series of indentations 50a, 50b, 50c, etc., as shown in Figure 5 is imparted to the anti-vibration bar 15.
  • the U-shaped tubes 13 are first assembled into the tube bundle 11 as illustrated in Figures 1A and B, and thereafter the pump 72 is coupled sequentially or in another desirable order to each of the anti-vibration bars 15 to impart the desired deformations.
  • the pump 72 is coupled by a conduit 64 and a fluid coupling 64b to the one end of the anti-vibration bar 15.
  • the opposite end of the anti-vibration bar 15 is attached to a fluid coupling 64a, which serves to prevent the leakage of the pressurized fluid, thus serving to permit the increase of pressure within the anti-vibration bar 15.
  • the pump 72 pumps the fluid via the conduit 66 and coupling 64b to the anti-vibration bar 15.
  • a pressure gauge 68 is coupled in circuit between the pump 72 and the anti-vibration bar 15, whereby a measurement of fluid pressure is obtained.
  • a pressure recorder 70 is connected to the pressure gauge 68, whereby a record of the fluid pressure may be kept, primarily, to ascertain the maximum fluid pressure.
  • an oval-shaped anti-vibration bar 15' as illustrated in Figures 8A and 8B, having a major diameter of 1 cm and a minor diameter of 0.75 cm was disposed between first and second rows 13' and 13" as positioned by the test rig 40. Fluid pressure was established within the anti-vibration bar 15 and gradually increased by the pump 72 to a maximum pressure.
  • the oval-shaped anti-vibration bar 15' may have a wall thickness of 0.5 mm and be made of that stainless steel known as type 304.
  • the pairs of test tubes 13' and 13" are deposed at six locations 1,2,3, 4, 5, and 6, each pair spaced 2.5 cm from an adjacent pair.
  • the spacings of the tube pairs 1 to 6 were set respectively to be 9.4, 8.6, 9.4, 7.6, 9.4 and 7.6 mm as would simulate the variations and spacings found within the tubes 13 of a typical tube bundle 11.
  • the pressure was incrementally raised by the pump 72 in steps of 35 kg/cm 2 until a maximum of 350 kg/cm 2 was reached, before returning the pressure to 0.
  • the following series of relatively uniformed diameters A and C resulted:
  • an anti-vibration bar 15" is configured as a rectangle having relative thick top and bottom sides 15a and 15c as compared to side walls 15b and 15d.
  • Dimensions B and C as shown in Figure 9A are, respectively, 7.5 and 12.5 mm.
  • Figure 9B illustrates the anti-vibration bar 15" after it was pneumatically expanded, whereby the side 15d is curved.
  • anti-vibration bar 15"' has side walls 15f and 15h interconnected by flexible side walls 15e and 15g.
  • the dimensions B and C are similar to those of the anti-vibration bar 15" as shown in Figure 9A.
  • the oval-shaped anti-vibration bar 15' is the preferred embodiment in that it is relatively easy and inexpensive to manufacture.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Vibration Prevention Devices (AREA)
  • Supports For Pipes And Cables (AREA)
  • Motor Or Generator Frames (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)

Claims (3)

1. Verfahren zur Bildung und zum Einbau von schwingungshemmenden Stangen (15) in ein Rohrbundel (11) eines Dampferzeugers, das aus Reihen von Rohren (13) besteht, die ein Hoch temperaturkühmittel aufnehmen, wobei die schwingungshemmenden Stangen (15) rohförmig sind und zur Stabilisierung der Rohre (13) zwischen benachbarten Rohr-Reihen des Bündels (11) angeordnet sind um dadurch Rohr-schwingungen zu verhindern, und wobei nach Einführung der schwingungshemmenden Stangen (15) zwischen benachbarten Rohr-Reihen des Bündels (11) ein Druckmittel in die schwingungshemmenden Stangen (15) angeleitet wird sodass die schwingungshemmenden Stangen (15) ausgedehnt werden und dadurch Spalte zwischen den schwingungshemmenden Stangen und den Rohren (13) in benachbarten Reihen auf ein Minimum reduziert werden, dadurch gekennzeichnet, dass der Druck des Druckmittels schrittweise erhöht wird bis die schwingungshemmenden Stangen (15) und den Rohren der benachbarten Rohr-Reihen in Berührung kommen wobei der Druck des Drucksmittels aber unter einem vorgegebenen Maximumwert gehalten wird bei dem ein Einbuchten der Rohre (13) mit Sicherheit vermieden wird.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Druck des Druckmittels in Schritten von 35 kg/cm2 erhöht wird bis der vorgegebene Maximumwert erreicht ist.
3. Verfahren nach Anspruch 1 oder 2, wobei die schwingunghemmenden Stangen (15) aus Edelstahl bestehen, dadurch gekennzeichnet, dass der Maximum wert auf etwa 350 kg/cm2 festgelegt ist.
EP85308234A 1984-11-13 1985-11-13 Schwingungsneutralisierende Stangen für einen Nukleardampferzeuger Expired EP0186957B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US67072884A 1984-11-13 1984-11-13
US670728 1984-11-13

Publications (2)

Publication Number Publication Date
EP0186957A1 EP0186957A1 (de) 1986-07-09
EP0186957B1 true EP0186957B1 (de) 1989-01-25

Family

ID=24691616

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85308234A Expired EP0186957B1 (de) 1984-11-13 1985-11-13 Schwingungsneutralisierende Stangen für einen Nukleardampferzeuger

Country Status (7)

Country Link
EP (1) EP0186957B1 (de)
JP (1) JPH0631712B2 (de)
CN (1) CN85108329A (de)
CA (1) CA1255984A (de)
DE (1) DE3567953D1 (de)
ES (1) ES8800408A1 (de)
ZA (1) ZA858048B (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2603364B1 (fr) * 1986-08-27 1988-11-10 Framatome Sa Procede de placement de tubes dans un generateur de vapeur
NO933519L (no) * 1993-10-01 1995-04-03 Kvaerner Rosenberg As Fremgangsmåte ved tilveiebringelse av en særlig mot vibrasjoner avstivet rörbunt, og slik avstivet rörbunt
JP2991027B2 (ja) * 1994-02-15 1999-12-20 住友金属工業株式会社 熱交換器およびその熱交換器用ｕベンド管の製造に用いる管曲げ方法
JP6071298B2 (ja) 2012-07-20 2017-02-01 三菱重工業株式会社 伝熱管の隙間拡張治具及び振動抑制部材の追設方法
JP2014043970A (ja) * 2012-08-24 2014-03-13 Mitsubishi Heavy Ind Ltd 振動抑制部材及び振動抑制部材の配設方法
CN103868051B (zh) * 2012-12-13 2015-08-26 中国核动力研究设计院 压水堆核电厂蒸汽发生器用分列式防振条结构
FR3008779B1 (fr) * 2013-07-19 2018-01-26 Areva Np Barre antivibratoire pour faisceau de tubes d'un generateur de vapeur

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB813152A (en) * 1956-04-09 1959-05-13 Konink Machinenfabriek Gebr St Improvements in and relating to heat exchangers
US3199582A (en) * 1962-04-06 1965-08-10 Foster Wheeler Corp Heat exchanger tube anti-vibration structure
GB1188564A (en) * 1967-11-14 1970-04-22 Hick Hargreaves And Company Lt Tube supports
US3864811A (en) * 1972-09-20 1975-02-11 Hick Hargreaves And Company Lt Methods of assembling tube supports
GB1532100A (en) * 1977-06-29 1978-11-15 Ass Elect Ind Tubular heat exchangers

Also Published As

Publication number Publication date
JPH0631712B2 (ja) 1994-04-27
DE3567953D1 (en) 1989-03-02
CN85108329A (zh) 1986-10-15
ES8800408A1 (es) 1987-11-01
EP0186957A1 (de) 1986-07-09
CA1255984A (en) 1989-06-20
JPS61122495A (ja) 1986-06-10
ES548633A0 (es) 1987-11-01
ZA858048B (en) 1986-06-25

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