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WO2012063661A1 - Method for producing steam generator - Google Patents

Method for producing steam generator Download PDF

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Publication number
WO2012063661A1
WO2012063661A1 PCT/JP2011/074997 JP2011074997W WO2012063661A1 WO 2012063661 A1 WO2012063661 A1 WO 2012063661A1 JP 2011074997 W JP2011074997 W JP 2011074997W WO 2012063661 A1 WO2012063661 A1 WO 2012063661A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat transfer
transfer tube
steam generator
bracing
interval
Prior art date
Application number
PCT/JP2011/074997
Other languages
French (fr)
Japanese (ja)
Inventor
康輔 北村
宣隆 中島
崇 香川
Original Assignee
三菱重工業株式会社
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 三菱重工業株式会社 filed Critical 三菱重工業株式会社
Publication of WO2012063661A1 publication Critical patent/WO2012063661A1/en

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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 long 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 long 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
    • 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
    • F28F9/007—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/30—Safety or protection arrangements; Arrangements for preventing malfunction for preventing vibrations
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21D—NUCLEAR POWER PLANT
    • G21D1/00—Details of nuclear power plant
    • G21D1/006—Details of nuclear power plant primary side of steam generators

Definitions

  • the present invention relates to a method for manufacturing a steam generator, for example, in which a bracing member is inserted at a predetermined position between heat transfer tubes.
  • the steam generator is a series of U-shaped heat transfer tubes.
  • a bracing member is used to prevent fluid excitation vibration in a U-shaped arc portion when the gas-liquid two-phase fluid flows outside the heat transfer tube.
  • the bracing member is substantially V-shaped inserted between the heat transfer tubes in the arc portion.
  • a member in which a substantially V-shaped anti-vibration member is further inserted inside a substantially V-shaped anti-vibration member is known (for example, see Patent Document 1).
  • Such a bracing member is inserted from the substantially V-shaped bent portion side between the heat transfer tubes laminated so that the arc portion is horizontal when the steam generator is manufactured, and the outermost peripheral heat transfer tube Both ends of the substantially V-shape project outside the arc portion. Thereafter, each end of the bracing member is connected.
  • a method in which a spacer is interposed between the anti-vibration members and fastened with bolts for example, refer to Patent Document 2
  • the slot is formed in the long portion.
  • a method of inserting a stop member, closing a space formed by a slot with a cover, and fastening the cover to a long portion with a bolt for example, see Patent Document 3 is known.
  • the vibration preventing member itself may vibrate. If the distance between adjacent members is smaller than a predetermined distance, the heat transfer tube may be damaged. For this reason, it is necessary to connect the adjacent bracing members at a predetermined interval.
  • the bracing members adjacent to each other by the spacer or the slot of the elongated portion are set at a predetermined interval. If the bolts are loosened, the spacers and the long part may fall off and fall, damaging the heat transfer tubes.
  • This invention solves the subject mentioned above, and while connecting the adjacent bracing member with a predetermined space
  • a method of manufacturing a steam generator according to the present invention is a method of manufacturing a steam generator in which an anti-vibration member is disposed between heat transfer tubes.
  • a spacing holding jig is disposed between the respective bracing members to hold the spacing between the bracing members, and the bracing members that are held by the spacing holding jig are mutually connected.
  • adjacent bracing members are connected by welding holding members, and the interval between the bracing members is set by a spacing holding jig that is attached during welding and removed after welding. Retained. For this reason, there is no gap holding jig when the steam generator is in operation. As a result, it is possible to connect adjacent anti-vibration members at a predetermined interval and prevent a member having the predetermined interval from falling into the steam generator.
  • the distance between the neighboring bracing members is measured, and the measured value
  • the distance holding jig having a size according to the above is used.
  • the spacing between the heat transfer tube and the bracing member is designed in consideration of the design tolerance by using the spacing holding jig according to the spacing between adjacent bracing members. Adjacent bracing members can be connected at predetermined intervals as required.
  • the heat transfer tube has a circular arc portion formed in a U shape, and the heat transfer tube in which a large diameter is arranged from the center toward the outside.
  • the arc portion is formed into a hemispherical shape by changing the diameter of the outermost heat transfer tube while overlapping the heat transfer tube layers, and the bracing member is inserted between the heat transfer tube layers.
  • an end projecting outside the arc portion forms a row provided along the hemispherical shape along the direction in which the heat transfer tube layers are stacked, and a plurality of the rows are provided following the hemispherical shape.
  • Each of the steps is performed from the center of the hemisphere to the outside in one row of the end portions of the bracing member.
  • this steam generator manufacturing method when welding is performed from the center of the hemisphere in the row of end portions of the bracing member, the interval between the bracing members at the center is first determined. It becomes easy to keep the balance of the spacing of the bracing members in the stacked direction. As a result, a highly accurate steam generator can be efficiently manufactured.
  • the heat transfer tube has a circular arc portion formed in a U shape, and the heat transfer tube in which a large diameter is arranged from the center toward the outside.
  • the arc portion is formed into a hemispherical shape by changing the diameter of the outermost heat transfer tube while overlapping the heat transfer tube layers, and the bracing member is inserted between the heat transfer tube layers.
  • an end projecting outside the arc portion forms a row provided along the hemispherical shape along the direction in which the heat transfer tube layers are stacked, and a plurality of the rows are provided following the hemispherical shape.
  • Each step is performed from the hemispherical outer side to the center in each row of the end portions of the anti-vibration member.
  • the hemispherical outer side is narrow due to the configuration of the steam generator. Is difficult. Furthermore, the interval adjustment and welding operations are difficult because the pre-adjustment width of the subsequent row is eliminated as much as the previous row is adjusted. For this reason, when welding is performed from the hemispherical outer row to the middle row, a reduction in work efficiency is suppressed. As a result, the steam generator can be efficiently manufactured.
  • the gap between the heat transfer tube and the bracing member is larger than a predetermined interval.
  • the holding member that connects the stop members is reduced and adjusted by contraction heating.
  • the interval between the respective bracing members can be corrected to a predetermined interval.
  • FIG. 1 is a schematic side sectional view of a steam generator according to an embodiment of the present invention.
  • FIG. 2 is a schematic plan view of the heat transfer tube group. 3 is a cross-sectional view taken along the line AA in FIG.
  • FIG. 4 is a schematic perspective view of the heat transfer tube group.
  • FIG. 5 is a schematic diagram showing a method for manufacturing a steam generator according to an embodiment of the present invention.
  • FIG. 6A is a process diagram illustrating a procedure for assembling a heat transfer tube in the method of manufacturing a steam generator according to the embodiment of the present invention.
  • FIG. 6B is a process diagram showing the procedure for assembling the heat transfer tube in the method for manufacturing the steam generator according to the embodiment of the present invention.
  • FIG. 6A is a process diagram illustrating a procedure for assembling a heat transfer tube in the method of manufacturing a steam generator according to the embodiment of the present invention.
  • FIG. 6B is a process diagram showing the procedure for assembling the heat transfer tube in the method
  • FIG. 6-3 is a process diagram showing a heat transfer tube assembling procedure in the steam generator manufacturing method according to the embodiment of the present invention.
  • FIG. 6-4 is a process diagram illustrating a procedure for assembling the heat transfer tube in the method for manufacturing the steam generator according to the embodiment of the present invention.
  • FIG. 6-5 is a process diagram showing the procedure for assembling the heat transfer tubes in the method for manufacturing the steam generator according to the embodiment of the present invention.
  • FIG. 7 is a cross-sectional view taken along line BB in FIG. 6-3.
  • FIG. 8-1 is a schematic diagram illustrating an example of a spacing unit used in the method for manufacturing a steam generator according to the embodiment of the present invention.
  • FIG. 8-2 is a schematic diagram illustrating an example of a spacing unit used in the method for manufacturing a steam generator according to the embodiment of the present invention.
  • FIG. 8-3 is a schematic diagram illustrating an example of a spacing unit used in the method for manufacturing a steam generator according to the embodiment of the present invention.
  • FIG. 9 is a schematic view showing the order in which the holding members are welded in the method of manufacturing the steam generator according to the embodiment of the present invention.
  • FIG. 1 is a schematic side sectional view of a steam generator according to the present embodiment.
  • the steam generator 1 is used, for example, in a pressurized water reactor (PWR: Pressurized Water Reactor).
  • the pressurized water reactor uses light water as a reactor coolant and neutron moderator.
  • the pressurized water reactor sends primary cooling water to the steam generator 1 as high-temperature and high-pressure water that does not boil light water over the entire core.
  • the heat of the primary cooling water at high temperature and high pressure is transmitted to the secondary cooling water, and water vapor is generated in the secondary cooling water. Then, the steam generator is rotated by this steam to generate electricity.
  • the steam generator 1 has a hollow cylindrical shape that extends in the vertical direction and is hermetically sealed, and has a body portion 2 in which the lower half is slightly smaller in diameter than the upper half.
  • the trunk portion 2 is provided with a tube group outer cylinder 3 having a cylindrical shape disposed at a predetermined distance from the inner wall surface of the trunk portion 2 in the lower half portion thereof.
  • the lower end portion of the tube group outer tube 3 extends to the vicinity of the tube plate 4 disposed below in the lower half of the body portion 2.
  • a heat transfer tube group 51 is provided in the tube group outer tube 3.
  • the heat transfer tube group 51 includes a plurality of heat transfer tubes 5 having an inverted U shape.
  • Each heat transfer tube 5 is arranged with the U-shaped arc portion facing upward, the lower end portion thereof is supported by the tube plate 4, and the intermediate portion thereof via the plurality of tube support plates 6. It is supported by.
  • a number of through holes are formed in the tube support plate 6, and the heat transfer tubes 5 are passed through the through holes.
  • the body 2 is provided with a water chamber 7 at its lower end.
  • the water chamber 7 is divided into an entrance chamber 71 and an exit chamber 72 by a partition wall 8.
  • the entrance chamber 71 communicates with one end of each heat transfer tube 5, and the exit chamber 72 communicates with the other end of each heat transfer tube 5.
  • the entrance chamber 71 is formed with an inlet nozzle 711 leading to the outside of the body portion 2, and the exit chamber 72 is formed with an exit nozzle 721 leading to the outside of the body portion 2.
  • the inlet nozzle 711 is connected to a cooling water pipe (not shown) through which primary cooling water is sent from the pressurized water reactor, and the outlet nozzle 721 passes the primary cooling water after heat exchange to the pressurized water reactor.
  • the cooling water piping (not shown) to send is connected.
  • an air-water separator 9 that separates feed water into steam and hot water, and a moisture separator that removes the moisture of the separated steam and makes it close to dry steam. 10 is provided.
  • a water supply pipe 11 for supplying secondary cooling water from the outside into the body 2 is inserted.
  • drum 2 has the vapor
  • the body 2 has a tube plate in the lower half of which the secondary cooling water supplied from the water supply pipe 11 into the body 2 flows down between the body 2 and the tube group outer tube 3.
  • a water supply path 13 that is folded back at 4 and raised along the heat transfer tube group 51 is formed.
  • the steam outlet 12 is connected to a cooling water pipe (not shown) for sending steam to the turbine, and the water supply pipe 11 has two steams used in the turbine cooled by a condenser (not shown).
  • a cooling water pipe (not shown) for supplying the next cooling water is connected.
  • the primary cooling water heated in the pressurized water reactor is sent to the entrance chamber 71, circulates through the numerous heat transfer tubes 5, and reaches the exit chamber 72.
  • the secondary cooling water cooled by the condenser is sent to the water supply pipe 11 and rises along the heat transfer pipe group 51 through the water supply path 13 in the trunk portion 2. At this time, heat exchange is performed between the high-pressure and high-temperature primary cooling water and the secondary cooling water in the trunk portion 2. Then, the cooled primary cooling water is returned from the outlet chamber 72 to the pressurized water reactor.
  • the secondary cooling water subjected to heat exchange with the high-pressure and high-temperature primary cooling water rises in the body portion 2 and is separated into steam and hot water by the steam separator 9.
  • the separated steam is sent to the turbine after moisture is removed by the moisture separator 10.
  • FIG. 2 is a schematic plan view of the heat transfer tube group
  • FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2
  • FIG. 4 is a schematic perspective view of the heat transfer tube group.
  • an inverted U-shaped arc portion of the heat transfer tube 5 is disposed at the upper end portion of the heat transfer tube group 51.
  • the heat transfer tubes 5 are arranged in such a manner that the arc portions having large diameters are arranged from the center toward the outside, and the arranged outermost outer circumferences are stacked side by side as shown in FIG.
  • the upper end portion of the heat transfer tube group 51 is formed in a hemispherical shape by changing the diameter of the heat transfer tube.
  • the bracing member 14 is inserted between the stacked rows of heat transfer tubes 5.
  • the bracing member 14 has a rectangular cross section, is formed by being bent into a substantially V shape, and a bent portion is disposed at a portion (predetermined position) having the same diameter in the row of the stacked heat transfer tubes 5. Then, both ends of the bracing member 14 protrude from the outer side of the arc portion of the heat transfer tube 5 having the largest diameter.
  • the ends of the bracing members 14 are arranged in a line along the hemispherical arc of the heat transfer tube group 51.
  • a small V-shaped member is disposed inside a large substantially V-shaped member to form a pair, and for example, three pairs are disposed in a semicircular portion of the heat transfer tube 5.
  • the bracing member 14 is formed of a metal material (for example, stainless steel 405 or 410) that is preferable for suppressing vibration of the heat transfer tube 5.
  • the joining member 15 is provided in the both ends which protrude outside the circular arc part of the heat exchanger tube 5. As shown in FIG.
  • the joining member 15 is formed of a metal material (for example, Inconel 690) which is the same metal material as the holding member 16 described later and has excellent corrosion resistance in a high temperature atmosphere.
  • the holding member 16 is welded to the joining member 15 provided on the bracing member 14.
  • the holding member 16 is formed of a metal material (for example, Inconel 690) excellent in corrosion resistance in a high temperature atmosphere, and is a rod-like member attached along the hemispherical outer periphery of the heat transfer tube group 51, and the outermost heat transfer tube. It is attached to the heat transfer tube group 51 by being welded to both ends of a substantially U-shaped attachment portion 17 inserted between the heat transfer tube 5 and the heat transfer tube 5 inside thereof.
  • the bracing member 14 is disposed in the heat transfer tube group 51 in a form inserted at a predetermined position between the heat transfer tubes 5.
  • FIG. 5 is a schematic diagram showing a method for manufacturing the steam generator according to the present embodiment
  • FIGS. 6-1 to 6-5 are methods for manufacturing the steam generator according to the present embodiment.
  • FIG. 7 is a process diagram showing a procedure for assembling a heat tube
  • FIG. 7 is a front view showing a spacing holding jig used in the method of manufacturing a steam generator according to the present embodiment, and is a cross-sectional view taken along line BB in FIG.
  • FIGS. 8A to 8C are schematic diagrams illustrating an example of the interval holding unit used in the method for manufacturing the steam generator according to the present embodiment
  • FIG. 9 illustrates the embodiment. It is the manufacturing method of the steam generator which concerns on this, and is the schematic which shows the order which welds a holding member.
  • the heat transfer tube 5 includes an upper half portion of the body portion 2, an air / water separator 9, a moisture separator 10, and a water supply tube 11 provided in the upper half portion. It is attached to the lower half part of the body part 2 before. As shown in FIG. 5, the tube group outer cylinder 3, the tube plate 4, and each tube support plate 6 are attached to the lower half of the body portion 2 in a state of being horizontally placed on the gantry 20. Thereafter, the heat transfer tube 5 is penetrated through the tube support plates 6 at both ends from the upper side in the lower half portion of the trunk portion 2 (right side for horizontal placement in FIG. 5), and is penetrated and fixed to the tube plate 4. It is arranged in a hemispherical shape on the upper side in the lower half of the part 2.
  • the heat transfer tube 5 penetrating the tube support plate 6 and the tube plate 4 has a single layer in which a plurality of large tubes are arranged horizontally from the center to the outside where the diameter of the arcuate portion formed in the U shape is the smallest.
  • the heat tube layer 5A (see FIG. 3) is used as a reference. And while this heat transfer tube layer 5A is laminated
  • bracing member 14 is inserted between the heat transfer tube layers 5A, and the end protruding outside the arc portion of the heat transfer tube 5 follows the hemispherical shape along the direction in which the heat transfer tube layers 5A are laminated.
  • a row is provided side by side, and a plurality of the rows are provided following the hemispherical shape (see FIG. 9).
  • Each heat transfer tube layer 5A has a lifter on the upper side (the right side in FIG. 5) of the lower half of the body portion 2 so that the heat transfer tube layers 5A can be taken out in order from the top with the layers stacked in reverse order. 21 is put on. A lifter 22 is provided between the lifter 21 and the lower half of the body 2 for a worker who performs an operation of penetrating the heat transfer tube 5 through the tube support plate 6 and the tube plate 4.
  • the end of the bracing member 14 inserted at a predetermined position between the heat transfer tube layers 5A and the outermost heat transfer tube 5 having the largest diameter are temporarily fixed such as a binding band.
  • the baffle member 14 is temporarily fixed to the heat transfer tube 5 (heat transfer tube group 51) by binding with the tool 18.
  • the horizontally laminated heat transfer tube layers 5A are vertically raised as shown in FIG. 6-2.
  • the heat transfer tube group 51 is rotated 90 degrees around the center line S shown in FIG.
  • the end of the bracing member 14 is fixed to the heat transfer tube 5 by the fixing jig 19 instead of the temporary fastener 18.
  • the fixing jig 19 described in Japanese Patent Application Laid-Open No. 2009-168398 may be used.
  • the holding member 16 is welded to the joining member 15 of the other end part of the bracing member 14.
  • FIG. The holding member 16 is welded so as to connect the row of end portions of the bracing member 14.
  • a gap holding jig 25 is interposed between the other ends of the anti-vibration member 14 not fixed by the fixing jig 19, and the clamp is performed.
  • a predetermined interval between the heat transfer tube 5 and the anti-vibration member 14 is maintained by sandwiching the joining member 15 at the other end of the anti-vibration member 14 on both sides with the interval holding jig 25 interposed therebetween (not shown).
  • the holding member 16 is welded to the joining member 15 at the other end of the bracing member 14 that is not fixed by the fixing jig 19.
  • the fixing jig 19 is removed, and one end is similarly held by the joining member 15 while holding the predetermined interval between the heat transfer tube 5 and the anti-rest member 14 using the interval holding jig 25 and the clamp.
  • the member 16 is welded.
  • the holding members 16 are continuously welded in the same row of the end portions of the bracing members 14, the welded bracing members 14 are adjacent to the bracing members 14 as shown in FIG. 6-4.
  • the interval holding jig 25 is inserted between the anti-vibration members 14, the respective anti-vibration members 14 are brought close to the interval holding jig 25, and fixed with clamps.
  • the holding member 16 is welded to the joining member 15 of the unwelded bracing member 14 fixed by the clamp.
  • the attaching part 17 is inserted between the outermost periphery in the heat exchanger tube 5 (heat exchanger tube group 51), and its inner side, and this attaching part The both ends of 17 and the holding member 16 are welded.
  • the interval holding jig 25 is protruded from the interval holding portion 25 a so as to be hung on the edge of the adjacent holding member 14 and the interval holding portion 25 a holding the interval between the adjacent holding members 14. And an arcuate portion 25c at the insertion end for facilitating insertion between the anti-vibration members 14.
  • the interval Wa formed by the interval holding unit 25 a takes into consideration the plate thickness Wb of the anti-vibration member 14, the diameter Wc of the heat transfer tube 5, and the thickness Wd of the joining member 15.
  • the distance W between the heat pipe 5 and the bracing member 14 is set to meet the designed requirements.
  • the interval holding jig 25 has four types according to the arrangement of the bracing member 14 and the joining member 15 with respect to the heat transfer tube 5. Specifically, as shown in FIG. 8A, it is inserted between the bracing member 14 and between the bracing member 14 and the joining member 15 as shown in FIG. 8B, and the configuration in which the anti-vibration member 14 and the joining member 15 are disposed in the reverse direction in FIG. As shown in FIG. 3, there is a form inserted between the joining members 15. These interval holding jigs 25 may be used according to the arrangement of the bracing member 14 and the joining member 15 with respect to the heat transfer tube 5.
  • the spacing holding jig 25 is a design that is a difference between the maximum dimension and the minimum dimension of an allowable error with respect to the plate thickness Wb of the bracing member 14, the diameter Wc of the heat transfer tube 5, and the thickness Wd of the joining member 15.
  • the interval Wa of the interval holding portion 25a is different so that the interval W between the heat transfer tube 5 and the bracing member 14 becomes a designed requirement.
  • the spacing member 14 is brought close to the heat transfer tube 5 to measure the spacing between the damping member 14 and the spacing W between the heat transfer tube 5 and the damping member 14.
  • the interval holding jig 25 is selected so as to be a predetermined interval. In this manner, the interval is adjusted so as to be allowed for the entire row of end portions of the bracing member 14.
  • welding of the holding member 16 to the joining member 15 of the bracing member 14 includes each row of end portions of the bracing member 14 as one area (indicated by ⁇ in FIG. 9), and each The area is defined as a zone (indicated by ⁇ in FIG. 9) divided into a plurality of zones in the direction in which the heat transfer tube layers 5A are laminated, and the order is determined for each zone and each area.
  • Each area is divided into 12 areas because in FIG. 9 there are 12 rows at the end of the bracing member 14.
  • each zone has a hemispherical central portion of the heat transfer tube group 51 as one zone, and is divided into three zones toward both outer sides, for a total of four zones.
  • each zone starting from the hemispherical central zone ⁇ 1 of the heat transfer tube group 51, welding is performed in the order of zone ⁇ 2 ⁇ zone ⁇ 3 ⁇ zone ⁇ 4. In each zone, welding is performed every predetermined number (for example, 10) of the anti-vibration members 14 from the inside to the outside. As described above, when welding is performed from the center of the hemispherical shape of the heat transfer tube group 51 in the zone, the interval between the anti-vibration members 14 at the center is first determined. It becomes easy to maintain the balance of the interval between the members 14.
  • each area welding is performed from the hemispherical outer side of the heat transfer tube group 51 to the center.
  • the uppermost outer area ⁇ 1 ⁇ the inner area ⁇ 2 ⁇ the lower outermost area ⁇ 3 ⁇ the inner area ⁇ 4 ⁇ the inner area ⁇ 5.
  • Inside area ⁇ 6 Inside area ⁇ 2 Inside area ⁇ 7 ⁇ Inside area ⁇ 8 ⁇ Inside area ⁇ 9 ⁇ Inside (uppermost inside) area ⁇ 10 ⁇ Inside of area ⁇ 6
  • Welding is performed in the order of area ⁇ 11 ⁇ area ⁇ 12 on the inner side (lower innermost side).
  • the hemispherical outer area of the heat transfer tube group 51 is narrow and close to the tube group outer tube 3 as shown in FIG. Furthermore, the interval adjustment and the welding work are difficult because the pre-adjustment width of the subsequent area is lost as the previous area is adjusted. For this reason, when welding is performed from the hemispherical outer area of the heat transfer tube group 51 to the center area, a reduction in work efficiency is suppressed.
  • welding is performed by combining each zone and each area. That is, starting from the zone ⁇ 1, welding is performed in the order of the area ⁇ 1 to the area ⁇ 12 in the zone ⁇ 1, and this is sequentially welded up to the zone ⁇ 4. If it does in this way, the balance of the space
  • the steam generator manufacturing method according to the present embodiment is inserted between the heat transfer tubes 5 and adjacent to each other in the steam generator manufacturing method in which the bracing member 14 is disposed between the heat transfer tubes 5.
  • the spacing holding jig 25 is disposed between the respective bracing members 14 to hold the spacing between the respective bracing members 14 and the respective bracing members 14 held by the spacing holding jig 25.
  • adjacent bracing members 14 are connected by welding holding members 16, and the spacing between the respective bracing members 14 is a spacing hold that is attached during welding and removed after welding. It is held by the jig 25. For this reason, the interval holding jig 25 does not exist when the steam generator is in operation. As a result, it is possible to connect adjacent anti-vibration members 14 at a predetermined interval and prevent a member having the predetermined interval from falling into the steam generator.
  • the spacing holding jig 25 between the adjacent bracing members 14 is measured, An interval holding jig 25 having a dimension corresponding to the measured value is used.
  • the heat transfer tube 5 and the anti-vibration member 14 are considered in consideration of design tolerances.
  • Adjacent bracing members 14 can be connected at a predetermined interval so that the interval W becomes a designed requirement.
  • the heat transfer tube 5 has a circular arc portion formed in a U shape, and a large diameter is arranged from the center toward the outside.
  • the heat transfer tube layer 5A is formed, and the arc portion is formed in a hemispherical shape by changing the diameter of the outermost heat transfer tube while overlapping the heat transfer tube layer 5A, and the bracing member 14 is provided between the heat transfer tube layers 5A.
  • an end projecting outward from the arc portion along the direction in which the heat transfer tube layers 5A are stacked along the hemispherical shape is formed, and the row follows the hemispherical shape.
  • Each step is performed from the center of the hemisphere to the outside in one row at the end of the anti-vibration member 14.
  • this steam generator manufacturing method when welding is performed from the center of the hemispherical shape of the heat transfer tube group 51 in the end row of the bracing members 14, the interval between the bracing members 14 at the center is first determined. For this reason, it becomes easy to maintain the balance of the spacing of the bracing members 14 in the direction in which the heat transfer tube layers 5A are laminated. As a result, a highly accurate steam generator can be efficiently manufactured.
  • each of the steps is performed from the outer side of the hemisphere to the center in each row of the end portion of the anti-vibration member 14.
  • the hemispherical outer area is narrow and close to the tube group outer tube 3 as shown in FIG. Compared to the side, it is difficult to adjust the distance and perform welding. Furthermore, the interval adjustment and the welding work are difficult because the pre-adjustment width of the subsequent area is lost as the previous area is adjusted. For this reason, when welding is performed from the hemispherical outer area of the heat transfer tube group 51 to the center area, a reduction in work efficiency is suppressed. As a result, the steam generator can be efficiently manufactured.
  • each said The portion of the holding member 16 that connects the anti-vibration members 14 is reduced and adjusted by contraction heating.

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  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

A method for producing a steam generator in which vibration-preventing members (14) are positioned between heating tubes (5) comprises: a step for a positioning spacing jigs (25) between adjoining vibration-preventing members (14) so as to insert the vibration-preventing members (14) between the heating tubes (5), thereby retaining the spacing of the vibration-preventing members (14); a step for welding a holding member (16) to the vibration-preventing members (14) such that the vibration-preventing members (14), the spacing of which is retained by the spacing jigs (25), are linked to each other; and a step for removing the spacing jigs (25) after the holding member (16) has been welded to the vibration-preventing members (14).

Description

蒸気発生器の製造方法Steam generator manufacturing method
　本発明は、例えば、伝熱管の間の所定位置に振止部材を挿入して成る蒸気発生器の製造方法に関するものである。 The present invention relates to a method for manufacturing a steam generator, for example, in which a bracing member is inserted at a predetermined position between heat transfer tubes.
　蒸気発生器は、Ｕ字形状の伝熱管が複数整列されたものである。この蒸気発生器では、伝熱管外に気液二相流体が流れる際のＵ字形状の円弧部での流体励起振動を防ぐため、振止部材が用いられている。振止部材は、円弧部において伝熱管の間に挿入されたほぼＶ字形状のものである。そして、十分な防振性能を得るため、ほぼＶ字形状の振止部材の内側に、さらにほぼＶ字形状の振止部材を挿入したものが知られている（例えば、特許文献１参照）。 The steam generator is a series of U-shaped heat transfer tubes. In this steam generator, a bracing member is used to prevent fluid excitation vibration in a U-shaped arc portion when the gas-liquid two-phase fluid flows outside the heat transfer tube. The bracing member is substantially V-shaped inserted between the heat transfer tubes in the arc portion. In order to obtain a sufficient vibration-proof performance, a member in which a substantially V-shaped anti-vibration member is further inserted inside a substantially V-shaped anti-vibration member is known (for example, see Patent Document 1).
　このような振止部材は、蒸気発生器の製造時において、円弧部が水平になるように積層された伝熱管の間に、ほぼＶ字形状の屈曲部側から挿入され、かつ最外周伝熱管の円弧部の外側にほぼＶ字形状の両端部が突出される。その後、振止部材は、それぞれの端部を連結される。ここで、振止部材の端部を連結するにあたり、振止部材間にスペーサを介在してボルトで締め付け固定する方法（例えば、特許文献２参照）や、長尺部に形成されたスロットに振止部材を挿入し、スロットにより形成される空間をカバーで閉鎖するとともに、このカバーを長尺部にボルトで締結する方法（例えば、特許文献３参照）が知られている。 Such a bracing member is inserted from the substantially V-shaped bent portion side between the heat transfer tubes laminated so that the arc portion is horizontal when the steam generator is manufactured, and the outermost peripheral heat transfer tube Both ends of the substantially V-shape project outside the arc portion. Thereafter, each end of the bracing member is connected. Here, when connecting the end portions of the anti-vibration member, a method in which a spacer is interposed between the anti-vibration members and fastened with bolts (for example, refer to Patent Document 2), or the slot is formed in the long portion. A method of inserting a stop member, closing a space formed by a slot with a cover, and fastening the cover to a long portion with a bolt (for example, see Patent Document 3) is known.
特開昭６１－２９１８９６号公報JP 61-291896 A 特開２００７－７８３０８号公報JP 2007-78308 A 特許第３９２３９９１号公報Japanese Patent No. 3923991
　ところで、振止部材は、隣接する間隔が所定よりも大きいと振止部材自体が振動するおそれがあり、隣接する間隔が所定よりも小さいと伝熱管に傷を発生させるおそれがある。このため、隣接される振止部材は、所定間隔にして連結する必要がある。 By the way, if the spacing between adjacent members is larger than a predetermined distance, the vibration preventing member itself may vibrate. If the distance between adjacent members is smaller than a predetermined distance, the heat transfer tube may be damaged. For this reason, it is necessary to connect the adjacent bracing members at a predetermined interval.
　上述した特許文献２および特許文献３の方法は、スペーサまたは長尺部のスロットによって隣接される振止部材を所定間隔にしているが、ボルトによる締結で固定されているため、蒸気発生器の稼働中にボルトが緩んだ場合、スペーサや長尺部が外れて落下し伝熱管を損傷させるおそれがある。 In the methods of Patent Document 2 and Patent Document 3 described above, the bracing members adjacent to each other by the spacer or the slot of the elongated portion are set at a predetermined interval. If the bolts are loosened, the spacers and the long part may fall off and fall, damaging the heat transfer tubes.
　本発明は、上述した課題を解決するものであり、隣接する振止部材を所定間隔で連結するとともに、当該所定間隔とする部材が蒸気発生器内に落下する事態を防ぐことのできる蒸気発生器の製造方法を提供することを目的とする。 This invention solves the subject mentioned above, and while connecting the adjacent bracing member with a predetermined space | interval, the steam generator which can prevent the situation where the member made into the said predetermined space | interval falls in a steam generator It aims at providing the manufacturing method of.
　上述の目的を達成するために、本発明の蒸気発生器の製造方法は、伝熱管の間に、振止部材を配置する蒸気発生器の製造方法において、前記伝熱管の間に挿入されて隣接する各前記振止部材の間に間隔保持治具を配置し、各前記振止部材の間隔を保持する工程と、前記間隔保持治具にて間隔を保持されている各前記振止部材を相互に連結する態様で保持部材を各前記振止部材に溶接する工程と、前記保持部材を各前記振止部材に溶接した後に前記間隔保持治具を取り外す工程と、を含むことを特徴とする。 In order to achieve the above-described object, a method of manufacturing a steam generator according to the present invention is a method of manufacturing a steam generator in which an anti-vibration member is disposed between heat transfer tubes. A spacing holding jig is disposed between the respective bracing members to hold the spacing between the bracing members, and the bracing members that are held by the spacing holding jig are mutually connected. And a step of welding the holding member to each of the bracing members, and a step of removing the spacing holding jig after welding the holding member to each of the bracing members.
　この蒸気発生器の製造方法によれば、隣接する振止部材が保持部材を溶接することで連結され、各振止部材間の間隔は、溶接時に取り付けられて溶接後に取り外される間隔保持治具により保持される。このため、蒸気発生器の稼働時には、間隔保持治具は存在しない。この結果、隣接する振止部材を所定間隔で連結するとともに、当該所定間隔とする部材が蒸気発生器内に落下する事態を防ぐことができる。 According to this method of manufacturing a steam generator, adjacent bracing members are connected by welding holding members, and the interval between the bracing members is set by a spacing holding jig that is attached during welding and removed after welding. Retained. For this reason, there is no gap holding jig when the steam generator is in operation. As a result, it is possible to connect adjacent anti-vibration members at a predetermined interval and prevent a member having the predetermined interval from falling into the steam generator.
　また、本発明の蒸気発生器の製造方法は、隣接する各前記振止部材の間に間隔保持治具を配置する工程では、隣接する各前記振止部材間の間隔を測定し、当該測定値に応じた寸法の前記間隔保持治具を用いることを特徴とする。 Further, in the method of manufacturing a steam generator according to the present invention, in the step of disposing an interval holding jig between the adjacent bracing members, the distance between the neighboring bracing members is measured, and the measured value The distance holding jig having a size according to the above is used.
　この蒸気発生器の製造方法によれば、隣接する各振止部材間の間隔に応じた間隔保持治具を用いることで、設計公差を考慮して伝熱管と振止部材との間隔が設計した要求となるように、隣接する振止部材を所定間隔で連結することができる。 According to this steam generator manufacturing method, the spacing between the heat transfer tube and the bracing member is designed in consideration of the design tolerance by using the spacing holding jig according to the spacing between adjacent bracing members. Adjacent bracing members can be connected at predetermined intervals as required.
　また、本発明の蒸気発生器の製造方法は、前記伝熱管は、Ｕ字形状に形成された円弧部を有し、当該円弧部の径が中央から外側に向けて大きなものを配列した伝熱管層とされ、かつ当該伝熱管層を重ねつつ最外周伝熱管の径を変えることで前記円弧部の部分が半球形状に形成され、前記振止部材は、各伝熱管層の間に挿入されるとともに、前記円弧部の外側に突出された端部が前記伝熱管層を積層した方向に沿いつつ半球形状に倣って並んで設けられた列をなし、かつ当該列が半球形状に倣って複数設けられており、各前記工程は、前記振止部材の端部の１つの列において半球状の中央から外側に至り行うことを特徴とする。 Further, in the method for manufacturing a steam generator according to the present invention, the heat transfer tube has a circular arc portion formed in a U shape, and the heat transfer tube in which a large diameter is arranged from the center toward the outside. The arc portion is formed into a hemispherical shape by changing the diameter of the outermost heat transfer tube while overlapping the heat transfer tube layers, and the bracing member is inserted between the heat transfer tube layers. In addition, an end projecting outside the arc portion forms a row provided along the hemispherical shape along the direction in which the heat transfer tube layers are stacked, and a plurality of the rows are provided following the hemispherical shape. Each of the steps is performed from the center of the hemisphere to the outside in one row of the end portions of the bracing member.
　この蒸気発生器の製造方法によれば、振止部材の端部の列において、半球状の中央から溶接を行うと、中央での振止部材の間隔を最初に決めることから、伝熱管層を積層した方向での振止部材の間隔の均衡が保ちやすくなる。この結果、精度の高い蒸気発生器を効率よく製造することができる。 According to this steam generator manufacturing method, when welding is performed from the center of the hemisphere in the row of end portions of the bracing member, the interval between the bracing members at the center is first determined. It becomes easy to keep the balance of the spacing of the bracing members in the stacked direction. As a result, a highly accurate steam generator can be efficiently manufactured.
　また、本発明の蒸気発生器の製造方法は、前記伝熱管は、Ｕ字形状に形成された円弧部を有し、当該円弧部の径が中央から外側に向けて大きなものを配列した伝熱管層とされ、かつ当該伝熱管層を重ねつつ最外周伝熱管の径を変えることで前記円弧部の部分が半球形状に形成され、前記振止部材は、各伝熱管層の間に挿入されるとともに、前記円弧部の外側に突出された端部が前記伝熱管層を積層した方向に沿いつつ半球形状に倣って並んで設けられた列をなし、かつ当該列が半球形状に倣って複数設けられており、各前記工程は、前記振止部材の端部の各前記列において半球状の外側から中央に至り行うことを特徴とする。 Further, in the method for manufacturing a steam generator according to the present invention, the heat transfer tube has a circular arc portion formed in a U shape, and the heat transfer tube in which a large diameter is arranged from the center toward the outside. The arc portion is formed into a hemispherical shape by changing the diameter of the outermost heat transfer tube while overlapping the heat transfer tube layers, and the bracing member is inserted between the heat transfer tube layers. In addition, an end projecting outside the arc portion forms a row provided along the hemispherical shape along the direction in which the heat transfer tube layers are stacked, and a plurality of the rows are provided following the hemispherical shape. Each step is performed from the hemispherical outer side to the center in each row of the end portions of the anti-vibration member.
　この蒸気発生器の製造方法によれば、振止部材の端部の各列において、半球状の外側は、蒸気発生器の構成上狭隘であるため、中央側と比較すると間隔調整および溶接の作業が難しい。さらに、間隔調整および溶接の作業は、前の列が調整されている分だけ後の列ほど調整の予幅がなくなるため難しい。このため、半球状の外側の列から中央の列に至り溶接を行うと、作業効率の低下が抑えられる。この結果、蒸気発生器を効率よく製造することができる。 According to this steam generator manufacturing method, in each row of the end portions of the bracing member, the hemispherical outer side is narrow due to the configuration of the steam generator. Is difficult. Furthermore, the interval adjustment and welding operations are difficult because the pre-adjustment width of the subsequent row is eliminated as much as the previous row is adjusted. For this reason, when welding is performed from the hemispherical outer row to the middle row, a reduction in work efficiency is suppressed. As a result, the steam generator can be efficiently manufactured.
　また、本発明の蒸気発生器の製造方法は、前記保持部材を各前記振止部材に溶接した後、前記伝熱管と前記振止部材との間隔が所定間隔よりも大きい場合、当該各前記振止部材間を連結する保持部材の部位を収縮加熱により縮小調整することを特徴とする。 Further, in the method for manufacturing a steam generator according to the present invention, after the holding member is welded to each of the bracing members, the gap between the heat transfer tube and the bracing member is larger than a predetermined interval. The holding member that connects the stop members is reduced and adjusted by contraction heating.
　この蒸気発生器の製造方法によれば、各振止部材の間隔を所定間隔に補正することができる。 According to this method for manufacturing a steam generator, the interval between the respective bracing members can be corrected to a predetermined interval.
　本発明によれば、隣接する振止部材を所定間隔で連結するとともに、当該所定間隔とする部材が蒸気発生器内に落下する事態を防ぐことができる。 According to the present invention, it is possible to connect adjacent anti-vibration members at a predetermined interval and prevent a member having the predetermined interval from falling into the steam generator.
図１は、本発明の実施の形態に係る蒸気発生器の側断面概略図である。FIG. 1 is a schematic side sectional view of a steam generator according to an embodiment of the present invention. 図２は、伝熱管群の平面視概略図である。FIG. 2 is a schematic plan view of the heat transfer tube group. 図３は、図２のＡ－Ａ断面図である。3 is a cross-sectional view taken along the line AA in FIG. 図４は、伝熱管群の斜視概略図である。FIG. 4 is a schematic perspective view of the heat transfer tube group. 図５は、本発明の実施の形態に係る蒸気発生器の製造方法を示す概略図である。FIG. 5 is a schematic diagram showing a method for manufacturing a steam generator according to an embodiment of the present invention. 図６－１は、本発明の実施の形態に係る蒸気発生器の製造方法であって伝熱管の組み立て手順を示す工程図である。FIG. 6A is a process diagram illustrating a procedure for assembling a heat transfer tube in the method of manufacturing a steam generator according to the embodiment of the present invention. 図６－２は、本発明の実施の形態に係る蒸気発生器の製造方法であって伝熱管の組み立て手順を示す工程図である。FIG. 6B is a process diagram showing the procedure for assembling the heat transfer tube in the method for manufacturing the steam generator according to the embodiment of the present invention. 図６－３は、本発明の実施の形態に係る蒸気発生器の製造方法であって伝熱管の組み立て手順を示す工程図である。FIG. 6-3 is a process diagram showing a heat transfer tube assembling procedure in the steam generator manufacturing method according to the embodiment of the present invention. 図６－４は、本発明の実施の形態に係る蒸気発生器の製造方法であって伝熱管の組み立て手順を示す工程図である。FIG. 6-4 is a process diagram illustrating a procedure for assembling the heat transfer tube in the method for manufacturing the steam generator according to the embodiment of the present invention. 図６－５は、本発明の実施の形態に係る蒸気発生器の製造方法であって伝熱管の組み立て手順を示す工程図である。FIG. 6-5 is a process diagram showing the procedure for assembling the heat transfer tubes in the method for manufacturing the steam generator according to the embodiment of the present invention. 図７は、図６－３のＢ－Ｂ断面図である。FIG. 7 is a cross-sectional view taken along line BB in FIG. 6-3. 図８－１は、本発明の実施の形態に係る蒸気発生器の製造方法に用いられる間隔保持部の例を示す概略図である。FIG. 8-1 is a schematic diagram illustrating an example of a spacing unit used in the method for manufacturing a steam generator according to the embodiment of the present invention. 図８－２は、本発明の実施の形態に係る蒸気発生器の製造方法に用いられる間隔保持部の例を示す概略図である。FIG. 8-2 is a schematic diagram illustrating an example of a spacing unit used in the method for manufacturing a steam generator according to the embodiment of the present invention. 図８－３は、本発明の実施の形態に係る蒸気発生器の製造方法に用いられる間隔保持部の例を示す概略図である。FIG. 8-3 is a schematic diagram illustrating an example of a spacing unit used in the method for manufacturing a steam generator according to the embodiment of the present invention. 図９は、本発明の実施の形態に係る蒸気発生器の製造方法であって保持部材を溶接する順序を示す概略図である。FIG. 9 is a schematic view showing the order in which the holding members are welded in the method of manufacturing the steam generator according to the embodiment of the present invention.
　以下に、本発明に係る実施の形態を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。また、下記実施の形態における構成要素には、当業者が置換可能かつ容易なもの、あるいは実質的に同一のものが含まれる。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.
　図１は、本実施の形態に係る蒸気発生器の側断面概略図である。蒸気発生器１は、例えば、加圧水型原子炉（ＰＷＲ：Pressurized　Water　Reactor）に用いられる。加圧水型原子炉は、原子炉冷却材および中性子減速材として軽水を使用している。加圧水型原子炉は、軽水を炉心全体にわたって沸騰しない高温高圧水としての一次冷却水を蒸気発生器１に送る。蒸気発生器１では、高温高圧の一次冷却水の熱を二次冷却水に伝え、二次冷却水に水蒸気を発生させる。そして、この水蒸気によりタービン発電機が回されて発電する。 FIG. 1 is a schematic side sectional view of a steam generator according to the present embodiment. The steam generator 1 is used, for example, in a pressurized water reactor (PWR: Pressurized Water Reactor). The pressurized water reactor uses light water as a reactor coolant and neutron moderator. The pressurized water reactor sends primary cooling water to the steam generator 1 as high-temperature and high-pressure water that does not boil light water over the entire core. In the steam generator 1, the heat of the primary cooling water at high temperature and high pressure is transmitted to the secondary cooling water, and water vapor is generated in the secondary cooling water. Then, the steam generator is rotated by this steam to generate electricity.
　蒸気発生器１は、上下方向に延在され、かつ密閉された中空円筒形状を成し、上半部に対して下半部が若干小径とされた胴部２を有している。胴部２は、その下半部内に、該胴部２の内壁面と所定間隔をもって配置された円筒形状を成す管群外筒３が設けられている。この管群外筒３は、その下端部が、胴部２の下半部内の下方に配置された管板４近傍まで延設されている。管群外筒３内には、伝熱管群５１が設けられている。伝熱管群５１は、逆Ｕ字形状をなす複数の伝熱管５から成る。各伝熱管５は、Ｕ字形状の円弧部を上方に向けて配置され、下端部が管板４に支持されているとともに、中間部が複数の管支持板６を介して管群外筒３に支持されている。管支持板６には、多数の貫通孔（図示せず）が形成されており、この貫通孔内に各伝熱管５が貫通されている。 The steam generator 1 has a hollow cylindrical shape that extends in the vertical direction and is hermetically sealed, and has a body portion 2 in which the lower half is slightly smaller in diameter than the upper half. The trunk portion 2 is provided with a tube group outer cylinder 3 having a cylindrical shape disposed at a predetermined distance from the inner wall surface of the trunk portion 2 in the lower half portion thereof. The lower end portion of the tube group outer tube 3 extends to the vicinity of the tube plate 4 disposed below in the lower half of the body portion 2. A heat transfer tube group 51 is provided in the tube group outer tube 3. The heat transfer tube group 51 includes a plurality of heat transfer tubes 5 having an inverted U shape. Each heat transfer tube 5 is arranged with the U-shaped arc portion facing upward, the lower end portion thereof is supported by the tube plate 4, and the intermediate portion thereof via the plurality of tube support plates 6. It is supported by. A number of through holes (not shown) are formed in the tube support plate 6, and the heat transfer tubes 5 are passed through the through holes.
　胴部２は、その下端部に水室７が設けられている。水室７は、内部が隔壁８により入室７１と出室７２とに区画されている。入室７１は、各伝熱管５の一端部が連通され、出室７２は、各伝熱管５の他端部が連通されている。また、入室７１は、胴部２の外部に通じる入口ノズル７１１が形成され、出室７２は、胴部２の外部に通じる出口ノズル７２１が形成されている。そして、入口ノズル７１１は、加圧水型原子炉から一次冷却水が送られる冷却水配管（図示せず）が連結され、出口ノズル７２１は、熱交換された後の一次冷却水を加圧水型原子炉に送る冷却水配管（図示せず）が連結される。 The body 2 is provided with a water chamber 7 at its lower end. The water chamber 7 is divided into an entrance chamber 71 and an exit chamber 72 by a partition wall 8. The entrance chamber 71 communicates with one end of each heat transfer tube 5, and the exit chamber 72 communicates with the other end of each heat transfer tube 5. In addition, the entrance chamber 71 is formed with an inlet nozzle 711 leading to the outside of the body portion 2, and the exit chamber 72 is formed with an exit nozzle 721 leading to the outside of the body portion 2. The inlet nozzle 711 is connected to a cooling water pipe (not shown) through which primary cooling water is sent from the pressurized water reactor, and the outlet nozzle 721 passes the primary cooling water after heat exchange to the pressurized water reactor. The cooling water piping (not shown) to send is connected.
　胴部２は、その上半部内に、給水を蒸気と熱水とに分離する気水分離器９、および分離された蒸気の湿分を除去して乾き蒸気に近い状態とする湿分分離器１０が設けられている。気水分離器９と伝熱管群５１との間には、外部から胴部２内に二次冷却水の給水を行う給水管１１が挿入されている。さらに、胴部２は、その上端部に、蒸気排出口１２が形成されている。また、胴部２は、その下半部内に、給水管１１からこの胴部２内に給水された二次冷却水を、胴部２と管群外筒３との間を流下させて管板４にて折り返させ、伝熱管群５１に沿って上昇させる給水路１３が形成されている。なお、蒸気排出口１２は、タービンに蒸気を送る冷却水配管（図示せず）が連結され、給水管１１は、タービンで使用された蒸気が復水器（図示せず）で冷却された二次冷却水を供給するための冷却水配管（図示せず）が連結される。 In the upper half of the body portion 2, an air-water separator 9 that separates feed water into steam and hot water, and a moisture separator that removes the moisture of the separated steam and makes it close to dry steam. 10 is provided. Between the steam / water separator 9 and the heat transfer tube group 51, a water supply pipe 11 for supplying secondary cooling water from the outside into the body 2 is inserted. Furthermore, the trunk | drum 2 has the vapor | steam exhaust port 12 formed in the upper end part. Further, the body 2 has a tube plate in the lower half of which the secondary cooling water supplied from the water supply pipe 11 into the body 2 flows down between the body 2 and the tube group outer tube 3. A water supply path 13 that is folded back at 4 and raised along the heat transfer tube group 51 is formed. The steam outlet 12 is connected to a cooling water pipe (not shown) for sending steam to the turbine, and the water supply pipe 11 has two steams used in the turbine cooled by a condenser (not shown). A cooling water pipe (not shown) for supplying the next cooling water is connected.
　このような蒸気発生器１では、加圧水型原子炉で加熱された一次冷却水は、入室７１に送られ、多数の伝熱管５内を通って循環して出室７２に至る。一方、復水器で冷却された二次冷却水は、給水管１１に送られ、胴部２内の給水路１３を通って伝熱管群５１に沿って上昇する。このとき、胴部２内で、高圧高温の一次冷却水と二次冷却水との間で熱交換が行われる。そして、冷やされた一次冷却水は出室７２から加圧水型原子炉に戻される。一方、高圧高温の一次冷却水と熱交換を行った二次冷却水は、胴部２内を上昇し、気水分離器９で蒸気と熱水とに分離される。そして、分離された蒸気は、湿分分離器１０で湿分が除去されてからタービンに送られる。 In such a steam generator 1, the primary cooling water heated in the pressurized water reactor is sent to the entrance chamber 71, circulates through the numerous heat transfer tubes 5, and reaches the exit chamber 72. On the other hand, the secondary cooling water cooled by the condenser is sent to the water supply pipe 11 and rises along the heat transfer pipe group 51 through the water supply path 13 in the trunk portion 2. At this time, heat exchange is performed between the high-pressure and high-temperature primary cooling water and the secondary cooling water in the trunk portion 2. Then, the cooled primary cooling water is returned from the outlet chamber 72 to the pressurized water reactor. On the other hand, the secondary cooling water subjected to heat exchange with the high-pressure and high-temperature primary cooling water rises in the body portion 2 and is separated into steam and hot water by the steam separator 9. The separated steam is sent to the turbine after moisture is removed by the moisture separator 10.
　このように構成された蒸気発生器１において、一次冷却水が各伝熱管５内を通過する際、逆Ｕ字形状の円弧部にて流体励起振動が発生する。そこで、伝熱管５の円弧部には、振止部材が設けられている。図２は、伝熱管群の平面視概略図であり、図３は、図２のＡ－Ａ断面図であり、図４は、伝熱管群の斜視概略図である。 In the steam generator 1 configured as described above, when the primary cooling water passes through each heat transfer tube 5, fluid-excited vibration is generated in the inverted U-shaped arc portion. Therefore, a bracing member is provided on the arc portion of the heat transfer tube 5. 2 is a schematic plan view of the heat transfer tube group, FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2, and FIG. 4 is a schematic perspective view of the heat transfer tube group.
　伝熱管群５１の上端部には、上述したように伝熱管５の逆Ｕ字形状の円弧部が配置されている。伝熱管５は、図３に示すように、中央から外側に向けて円弧部の径が大きなものを配列し、かつ該配列したものを、図２に示すように、側方に重ねつつ最外周伝熱管の径を変えることで、伝熱管群５１の上端部を半球形状に形成している。 As described above, an inverted U-shaped arc portion of the heat transfer tube 5 is disposed at the upper end portion of the heat transfer tube group 51. As shown in FIG. 3, the heat transfer tubes 5 are arranged in such a manner that the arc portions having large diameters are arranged from the center toward the outside, and the arranged outermost outer circumferences are stacked side by side as shown in FIG. The upper end portion of the heat transfer tube group 51 is formed in a hemispherical shape by changing the diameter of the heat transfer tube.
　振止部材１４は、図４に示すように、重ねられた伝熱管５の列の間に挿入されている。振止部材１４は、矩形断面を成し、ほぼＶ字形状に折り曲げて形成され、重ねられた各伝熱管５の列における同径の部位（所定位置）に屈曲部が配置される。そして、振止部材１４は、最も大きい径の伝熱管５の円弧部の外側に両端部が突出されている。この振止部材１４の端部は、伝熱管群５１の半球形状の円弧に沿って一列に並んで配置される。また、振止部材１４は、大きいほぼＶ字形状のものの内側に小さいＶ字形状のものが配置されて対を成し、この対が伝熱管５の半円部分に例えば３つ配置されている。この振止部材１４は、伝熱管５の振動を抑止するのに好ましい金属材（例えば、ステンレス４０５あるいは４１０）で形成されている。また、伝熱管５の円弧部の外側に突出されている両端部には、接合部材１５が設けられている。この接合部材１５は、後述する保持部材１６と同一の金属材であって、高温雰囲気での耐食性に優れた金属材（例えば、インコネル６９０）で形成されている。 As shown in FIG. 4, the bracing member 14 is inserted between the stacked rows of heat transfer tubes 5. The bracing member 14 has a rectangular cross section, is formed by being bent into a substantially V shape, and a bent portion is disposed at a portion (predetermined position) having the same diameter in the row of the stacked heat transfer tubes 5. Then, both ends of the bracing member 14 protrude from the outer side of the arc portion of the heat transfer tube 5 having the largest diameter. The ends of the bracing members 14 are arranged in a line along the hemispherical arc of the heat transfer tube group 51. In addition, as for the bracing member 14, a small V-shaped member is disposed inside a large substantially V-shaped member to form a pair, and for example, three pairs are disposed in a semicircular portion of the heat transfer tube 5. . The bracing member 14 is formed of a metal material (for example, stainless steel 405 or 410) that is preferable for suppressing vibration of the heat transfer tube 5. Moreover, the joining member 15 is provided in the both ends which protrude outside the circular arc part of the heat exchanger tube 5. As shown in FIG. The joining member 15 is formed of a metal material (for example, Inconel 690) which is the same metal material as the holding member 16 described later and has excellent corrosion resistance in a high temperature atmosphere.
　振止部材１４に設けられた接合部材１５は、図２～図４に示すように、保持部材１６が溶接される。保持部材１６は、高温雰囲気での耐食性に優れた金属材（例えば、インコネル６９０）で形成され、伝熱管群５１の半球状の外周に沿って取り付けられた棒状のもので、最外周の伝熱管５とその内側の伝熱管５との間に挿入されたほぼコ字形状の取付部１７の両端に溶接されることで伝熱管群５１に取り付けられる。このように、振止部材１４は、伝熱管５の間の所定位置に挿入された形態で前記伝熱管群５１に配設されている。 As shown in FIGS. 2 to 4, the holding member 16 is welded to the joining member 15 provided on the bracing member 14. The holding member 16 is formed of a metal material (for example, Inconel 690) excellent in corrosion resistance in a high temperature atmosphere, and is a rod-like member attached along the hemispherical outer periphery of the heat transfer tube group 51, and the outermost heat transfer tube. It is attached to the heat transfer tube group 51 by being welded to both ends of a substantially U-shaped attachment portion 17 inserted between the heat transfer tube 5 and the heat transfer tube 5 inside thereof. Thus, the bracing member 14 is disposed in the heat transfer tube group 51 in a form inserted at a predetermined position between the heat transfer tubes 5.
　図５は、本実施の形態に係る蒸気発生器の製造方法を示す概略図であり、図６－１～図６－５は、本実施の形態に係る蒸気発生器の製造方法であって伝熱管の組み立て手順を示す工程図であり、図７は、本実施の形態に係る蒸気発生器の製造方法に用いられる間隔保持治具を示す正面図であって図６－３のＢ－Ｂ断面図であり、図８－１～図８－３は、本実施の形態に係る蒸気発生器の製造方法に用いられる間隔保持部の例を示す概略図であり、図９は、本実施の形態に係る蒸気発生器の製造方法であって保持部材を溶接する順序を示す概略図である。 FIG. 5 is a schematic diagram showing a method for manufacturing the steam generator according to the present embodiment, and FIGS. 6-1 to 6-5 are methods for manufacturing the steam generator according to the present embodiment. FIG. 7 is a process diagram showing a procedure for assembling a heat tube, and FIG. 7 is a front view showing a spacing holding jig used in the method of manufacturing a steam generator according to the present embodiment, and is a cross-sectional view taken along line BB in FIG. FIGS. 8A to 8C are schematic diagrams illustrating an example of the interval holding unit used in the method for manufacturing the steam generator according to the present embodiment, and FIG. 9 illustrates the embodiment. It is the manufacturing method of the steam generator which concerns on this, and is the schematic which shows the order which welds a holding member.
　上述した蒸気発生器１を製造するにあたり、伝熱管５は、胴部２の上半部や、当該上半部に設けられる気水分離器９、湿分分離器１０および給水管１１が配置される以前の胴部２の下半部に取り付けられる。図５に示すように、胴部２の下半部は、架台２０の上に横置きされた状態で、管群外筒３、管板４および各管支持板６が取り付けられる。その後、伝熱管５が、胴部２の下半部における上側（図５では横置きのため右側）から、両端部を各管支持板６に貫通され、かつ管板４に貫通固定され、胴部２の下半部における上側に半球形状に配置される。 In manufacturing the steam generator 1 described above, the heat transfer tube 5 includes an upper half portion of the body portion 2, an air / water separator 9, a moisture separator 10, and a water supply tube 11 provided in the upper half portion. It is attached to the lower half part of the body part 2 before. As shown in FIG. 5, the tube group outer cylinder 3, the tube plate 4, and each tube support plate 6 are attached to the lower half of the body portion 2 in a state of being horizontally placed on the gantry 20. Thereafter, the heat transfer tube 5 is penetrated through the tube support plates 6 at both ends from the upper side in the lower half portion of the trunk portion 2 (right side for horizontal placement in FIG. 5), and is penetrated and fixed to the tube plate 4. It is arranged in a hemispherical shape on the upper side in the lower half of the part 2.
　管支持板６および管板４に貫通される伝熱管５は、Ｕ字形状に形成された円弧部の径が最も小さい中央から外側に向けて大きなものを水平に複数配列される１層の伝熱管層５Ａ（図３参照）が基準とされる。そして、この伝熱管層５Ａが最下層から積層されつつ、各伝熱管層５Ａの間の所定位置に振止部材１４が挿入される。これにより、伝熱管５の円弧部の部分が半球形状に形成される。また、振止部材１４は、各伝熱管層５Ａの間に挿入され、伝熱管５の円弧部の外側に突出された端部が伝熱管層５Ａを積層した方向に沿いつつ半球形状に倣って並んで設けられた列をなし、かつ当該列が半球形状に倣って複数設けられる（図９参照）。 The heat transfer tube 5 penetrating the tube support plate 6 and the tube plate 4 has a single layer in which a plurality of large tubes are arranged horizontally from the center to the outside where the diameter of the arcuate portion formed in the U shape is the smallest. The heat tube layer 5A (see FIG. 3) is used as a reference. And while this heat transfer tube layer 5A is laminated | stacked from the lowest layer, the bracing member 14 is inserted in the predetermined position between each heat transfer tube layer 5A. Thereby, the part of the circular arc part of the heat exchanger tube 5 is formed in hemispherical shape. Further, the bracing member 14 is inserted between the heat transfer tube layers 5A, and the end protruding outside the arc portion of the heat transfer tube 5 follows the hemispherical shape along the direction in which the heat transfer tube layers 5A are laminated. A row is provided side by side, and a plurality of the rows are provided following the hemispherical shape (see FIG. 9).
　なお、各伝熱管層５Ａは、最下層から積層される順番を逆に重ねられた状態で、上から順に取り出せるように、胴部２の下半部における上側（図５の右側）において、リフタ２１の上に置かれる。なお、リフタ２１と胴部２の下半部との間には、伝熱管５を管支持板６および管板４に貫通する作業を行う作業者が乗るためのリフタ２２が設けられる。 Each heat transfer tube layer 5A has a lifter on the upper side (the right side in FIG. 5) of the lower half of the body portion 2 so that the heat transfer tube layers 5A can be taken out in order from the top with the layers stacked in reverse order. 21 is put on. A lifter 22 is provided between the lifter 21 and the lower half of the body 2 for a worker who performs an operation of penetrating the heat transfer tube 5 through the tube support plate 6 and the tube plate 4.
　そして、図６－１に示すように、伝熱管層５Ａの間の所定位置に挿入した振止部材１４の端部と、最も大きい径の外側の伝熱管５とを、結束バンドなどの仮止具１８によって結束することで、振止部材１４を伝熱管５（伝熱管群５１）に対して仮止めする。 Then, as shown in FIG. 6A, the end of the bracing member 14 inserted at a predetermined position between the heat transfer tube layers 5A and the outermost heat transfer tube 5 having the largest diameter are temporarily fixed such as a binding band. The baffle member 14 is temporarily fixed to the heat transfer tube 5 (heat transfer tube group 51) by binding with the tool 18.
　そして、全ての伝熱管層５Ａの積層および振止部材１４の挿入および仮止めが終了した後、図６－２に示すように、水平に積層された伝熱管層５Ａを縦に起こした形態に、図３に示す中心線Ｓを中心に伝熱管群５１を９０度回転させる。そして、伝熱管群５１を回転させた後、仮止具１８に代えて振止部材１４の端部を固定治具１９により伝熱管５に対して固定する。固定治具１９は、例えば、特開２００９－１６８３９８号公報に記載されたものを用いればよい。 After the lamination of all the heat transfer tube layers 5A and the insertion and temporary fixing of the bracing member 14, the horizontally laminated heat transfer tube layers 5A are vertically raised as shown in FIG. 6-2. Then, the heat transfer tube group 51 is rotated 90 degrees around the center line S shown in FIG. Then, after rotating the heat transfer tube group 51, the end of the bracing member 14 is fixed to the heat transfer tube 5 by the fixing jig 19 instead of the temporary fastener 18. For example, the fixing jig 19 described in Japanese Patent Application Laid-Open No. 2009-168398 may be used.
　なお、振止部材１４を固定治具１９により伝熱管５に対して固定する場合、振止部材１４の一方の端部のみ固定する。そして、固定治具１９により振止部材１４を伝熱管５に固定した後、振止部材１４の他方の端部の接合部材１５に保持部材１６を溶接する。保持部材１６は、振止部材１４の端部の列を連結するように溶接される。 Note that when the bracing member 14 is fixed to the heat transfer tube 5 by the fixing jig 19, only one end of the bracing member 14 is fixed. And after fixing the bracing member 14 to the heat exchanger tube 5 with the fixing jig 19, the holding member 16 is welded to the joining member 15 of the other end part of the bracing member 14. FIG. The holding member 16 is welded so as to connect the row of end portions of the bracing member 14.
　保持部材１６の溶接においては、図６－３に示すように、固定治具１９で固定されていない振止部材１４の他方の端部の相互間に間隔保持治具２５を介在させ、かつクランプ（図示せず）により、間隔保持治具２５を介在させた両側の振止部材１４の他方の端部の接合部材１５を挟んで、伝熱管５と振止部材１４との所定間隔を維持する。その後、固定治具１９で固定されていない振止部材１４の他方の端部の接合部材１５に保持部材１６を溶接する。さらにその後、固定治具１９を外し、一方の端部も同様に間隔保持治具２５およびクランプを用いて伝熱管５と振止部材１４との所定間隔を保持しつつ、その接合部材１５に保持部材１６を溶接する。 In the welding of the holding member 16, as shown in FIG. 6-3, a gap holding jig 25 is interposed between the other ends of the anti-vibration member 14 not fixed by the fixing jig 19, and the clamp is performed. A predetermined interval between the heat transfer tube 5 and the anti-vibration member 14 is maintained by sandwiching the joining member 15 at the other end of the anti-vibration member 14 on both sides with the interval holding jig 25 interposed therebetween (not shown). . Thereafter, the holding member 16 is welded to the joining member 15 at the other end of the bracing member 14 that is not fixed by the fixing jig 19. After that, the fixing jig 19 is removed, and one end is similarly held by the joining member 15 while holding the predetermined interval between the heat transfer tube 5 and the anti-rest member 14 using the interval holding jig 25 and the clamp. The member 16 is welded.
　具体的に、振止部材１４の接合部材１５に保持部材１６を溶接する際には、図６－３に示すように、振止部材１４の端部の列で、最初に溶接される隣接する３つの振止部材１４の各間に、１つずつ２個の間隔保持治具２５を挿入し、当該各間隔保持治具２５に対して外側２つの振止部材１４を寄せ、クランプで固定する。そして、クランプで固定された隣接する３つの振止部材１４の接合部材１５に保持部材１６を溶接する。 Specifically, when the holding member 16 is welded to the joining member 15 of the bracing member 14, as shown in FIG. Two spacing members 25 are inserted between each of the three retaining members 14, and the two outer retaining members 14 are brought close to each spacing member 25 and fixed with clamps. . And the holding member 16 is welded to the joining member 15 of the three adjacent bracing members 14 fixed by the clamp.
　さらに、振止部材１４の端部の同じ列で続けて保持部材１６を溶接する場合、図６－４に示すように、溶接が済んだ振止部材１４と、この振止部材１４に隣接する振止部材１４との間に間隔保持治具２５を挿入し、当該間隔保持治具２５に対して各振止部材１４を寄せ、クランプで固定する。そして、クランプで固定された溶接されていない振止部材１４の接合部材１５に保持部材１６を溶接する。 Further, when the holding members 16 are continuously welded in the same row of the end portions of the bracing members 14, the welded bracing members 14 are adjacent to the bracing members 14 as shown in FIG. 6-4. The interval holding jig 25 is inserted between the anti-vibration members 14, the respective anti-vibration members 14 are brought close to the interval holding jig 25, and fixed with clamps. And the holding member 16 is welded to the joining member 15 of the unwelded bracing member 14 fixed by the clamp.
　なお、隣接する振止部材１４の接合部材１５に保持部材１６を溶接した後、伝熱管５と振止部材１４との間隔Ｗが所定間隔よりも大きい場合、図６－５に示すように、クランプを外して間隔保持治具２５を付けたままの状態で、各振止部材１４間を連結する保持部材１６の部位Ｈを加熱し、収縮加熱により縮小調整する。間隔保持治具２５は、溶接部が周囲の温度まで冷却されて、熱収縮が終了してから取り外す。 When the interval W between the heat transfer tube 5 and the anti-vibration member 14 is larger than the predetermined interval after the holding member 16 is welded to the joining member 15 of the adjacent anti-vibration member 14, as shown in FIG. In a state where the clamp is removed and the interval holding jig 25 is attached, the portion H of the holding member 16 that connects the respective anti-vibration members 14 is heated, and the reduction adjustment is performed by contraction heating. The interval holding jig 25 is removed after the welded portion is cooled to the ambient temperature and the thermal contraction is completed.
　そして、保持部材１６を各振止部材１４の接合部材１５に溶接した後、間隔保持治具２５およびクランプを取り外す。 Then, after the holding member 16 is welded to the joining member 15 of each bracing member 14, the interval holding jig 25 and the clamp are removed.
　そして、全ての振止部材１４の接合部材１５に保持部材１６を溶接した後、伝熱管５（伝熱管群５１）における最外周とその内側との間に取付部１７を挿入し、該取付部１７の両端と保持部材１６とを溶接する。 And after welding the holding member 16 to the joining member 15 of all the bracing members 14, the attaching part 17 is inserted between the outermost periphery in the heat exchanger tube 5 (heat exchanger tube group 51), and its inner side, and this attaching part The both ends of 17 and the holding member 16 are welded.
　間隔保持治具２５は、図７に示すように、隣接する振止部材１４の間隔を保持する間隔保持部２５ａと、隣接する振止部材１４の縁に掛かるように間隔保持部２５ａから突出された突起部２５ｂと、振止部材１４間への挿入を容易とするための挿入端の円弧部２５ｃとを有している。間隔保持部２５ａがなす間隔Ｗａは、図６－５および図７に示すように、振止部材１４の板厚Ｗｂ、伝熱管５の径Ｗｃ、接合部材１５の厚さＷｄを考慮し、伝熱管５と振止部材１４との間隔Ｗが設計した要求となるように設定される。 As shown in FIG. 7, the interval holding jig 25 is protruded from the interval holding portion 25 a so as to be hung on the edge of the adjacent holding member 14 and the interval holding portion 25 a holding the interval between the adjacent holding members 14. And an arcuate portion 25c at the insertion end for facilitating insertion between the anti-vibration members 14. As shown in FIGS. 6-5 and 7, the interval Wa formed by the interval holding unit 25 a takes into consideration the plate thickness Wb of the anti-vibration member 14, the diameter Wc of the heat transfer tube 5, and the thickness Wd of the joining member 15. The distance W between the heat pipe 5 and the bracing member 14 is set to meet the designed requirements.
　また、間隔保持治具２５は、伝熱管５に対する振止部材１４および接合部材１５の配置に応じて４種類の形態を有する。具体的には、図８－１に示すように、振止部材１４の間に挿入される形態と、図８－２に示すように、振止部材１４と接合部材１５との間に挿入される形態と、図８－２において、振止部材１４と接合部材１５とが逆に配置されている場合に、振止部材１４と接合部材１５との間に挿入される形態と、図８－３に示すように、接合部材１５の間に挿入される形態とがある。これらの間隔保持治具２５は、伝熱管５に対する振止部材１４および接合部材１５の配置に応じて用いればよい。 Further, the interval holding jig 25 has four types according to the arrangement of the bracing member 14 and the joining member 15 with respect to the heat transfer tube 5. Specifically, as shown in FIG. 8A, it is inserted between the bracing member 14 and between the bracing member 14 and the joining member 15 as shown in FIG. 8B, and the configuration in which the anti-vibration member 14 and the joining member 15 are disposed in the reverse direction in FIG. As shown in FIG. 3, there is a form inserted between the joining members 15. These interval holding jigs 25 may be used according to the arrangement of the bracing member 14 and the joining member 15 with respect to the heat transfer tube 5.
　また、間隔保持治具２５は、振止部材１４の板厚Ｗｂ、伝熱管５の径Ｗｃ、接合部材１５の厚さＷｄについて、許容される誤差の最大寸法と最小寸法との差である設計公差を考慮し、伝熱管５と振止部材１４との間隔Ｗが設計した要求となるように、間隔保持部２５ａの間隔Ｗａが異なる複数種類の形態を有する。例えば、５／１００［ｍｍ］単位で５種類の間隔Ｗａの形態を有する。なお、この間隔Ｗａの異なる形態は、図８－１～図８－３に示す４種類の形態のそれぞれに用意される。 The spacing holding jig 25 is a design that is a difference between the maximum dimension and the minimum dimension of an allowable error with respect to the plate thickness Wb of the bracing member 14, the diameter Wc of the heat transfer tube 5, and the thickness Wd of the joining member 15. In consideration of tolerances, there are a plurality of types in which the interval Wa of the interval holding portion 25a is different so that the interval W between the heat transfer tube 5 and the bracing member 14 becomes a designed requirement. For example, there are five types of intervals Wa in units of 5/100 [mm]. Note that different forms of the interval Wa are prepared for each of the four types of forms shown in FIGS. 8-1 to 8-3.
　間隔Ｗａの異なる形態を用いるには、例えば、伝熱管５に振止部材１４を寄せて振止部材１４の間の間隔、および伝熱管５と振止部材１４との間隔Ｗを測り、間隔Ｗが所定間隔となるように、間隔保持治具２５を選択する。このようにして、振止部材１４の端部の列全体として許容する範囲の間隔に調整する。 In order to use different forms of the spacing Wa, for example, the spacing member 14 is brought close to the heat transfer tube 5 to measure the spacing between the damping member 14 and the spacing W between the heat transfer tube 5 and the damping member 14. The interval holding jig 25 is selected so as to be a predetermined interval. In this manner, the interval is adjusted so as to be allowed for the entire row of end portions of the bracing member 14.
　振止部材１４の接合部材１５への保持部材１６の溶接は、図９に示すように、振止部材１４の端部の各列を１つのエリア（図９において□で示す）とし、かつ各エリアを、伝熱管層５Ａを積層した方向で複数に区分したゾーン（図９において△で示す）とし、各ゾーンおよび各エリアで順序を決めて行われる。各エリアは、図９では振止部材１４の端部の列が１２列あるため、１２エリアに区分されている。また、各ゾーンは、図９では伝熱管群５１の半球状の中央部分を１つのゾーンとし、その両外側に向かって３つのゾーンに分けられ、計４ゾーンに区分けされている。 As shown in FIG. 9, welding of the holding member 16 to the joining member 15 of the bracing member 14 includes each row of end portions of the bracing member 14 as one area (indicated by □ in FIG. 9), and each The area is defined as a zone (indicated by Δ in FIG. 9) divided into a plurality of zones in the direction in which the heat transfer tube layers 5A are laminated, and the order is determined for each zone and each area. Each area is divided into 12 areas because in FIG. 9 there are 12 rows at the end of the bracing member 14. In addition, in FIG. 9, each zone has a hemispherical central portion of the heat transfer tube group 51 as one zone, and is divided into three zones toward both outer sides, for a total of four zones.
　各ゾーンにおいては、伝熱管群５１の半球状の中央のゾーン△１から始め、ゾーン△２→ゾーン△３→ゾーン△４の順で外側に至り溶接を行う。また、各ゾーンでは、内側から外側に至り振止部材１４の所定数（例えば１０個）ごとに溶接を行う。このように、ゾーンにおいて、伝熱管群５１の半球状の中央から溶接を行うと、中央での振止部材１４の間隔を最初に決めることから、伝熱管層５Ａを積層した方向での振止部材１４の間隔の均衡が保ちやすくなる。 In each zone, starting from the hemispherical central zone Δ1 of the heat transfer tube group 51, welding is performed in the order of zone Δ2 → zone Δ3 → zone Δ4. In each zone, welding is performed every predetermined number (for example, 10) of the anti-vibration members 14 from the inside to the outside. As described above, when welding is performed from the center of the hemispherical shape of the heat transfer tube group 51 in the zone, the interval between the anti-vibration members 14 at the center is first determined. It becomes easy to maintain the balance of the interval between the members 14.
　また、各エリアにおいては、伝熱管群５１の半球状の外側から中央に至り溶接を行う。具体的には、図９に示すように、上方の最外側のエリア□１→その内側のエリア□２→下方の最外側のエリア□３→その内側のエリア□４→その内側のエリア□５→その内側のエリア□６→エリア□２の内側のエリア□７→その内側のエリア□８→その内側のエリア□９→その内側（上方の最内側）のエリア□１０→エリア□６の内側のエリア□１１→その内側（下方の最内側）のエリア□１２の順で溶接を行う。エリアにおいて、伝熱管群５１の半球状の外側のエリアは、図５に示すように管群外筒３に近く狭隘であるため、中央側と比較すると間隔調整および溶接の作業が難しい。さらに、間隔調整および溶接の作業は、前のエリアが調整されている分だけ後のエリアほど調整の予幅がなくなるため難しい。このため、伝熱管群５１の半球状の外側のエリアから中央のエリアに至り溶接を行うと、作業効率の低下が抑えられる。 Also, in each area, welding is performed from the hemispherical outer side of the heat transfer tube group 51 to the center. Specifically, as shown in FIG. 9, the uppermost outer area □ 1 → the inner area □ 2 → the lower outermost area □ 3 → the inner area □ 4 → the inner area □ 5. → Inside area □ 6 → Inside area □ 2 Inside area □ 7 → Inside area □ 8 → Inside area □ 9 → Inside (uppermost inside) area □ 10 → Inside of area □ 6 Welding is performed in the order of area □ 11 → area □ 12 on the inner side (lower innermost side). In the area, the hemispherical outer area of the heat transfer tube group 51 is narrow and close to the tube group outer tube 3 as shown in FIG. Furthermore, the interval adjustment and the welding work are difficult because the pre-adjustment width of the subsequent area is lost as the previous area is adjusted. For this reason, when welding is performed from the hemispherical outer area of the heat transfer tube group 51 to the center area, a reduction in work efficiency is suppressed.
　そして、各ゾーンおよび各エリアを組み合わせて溶接を行う。すなわち、ゾーン△１から始め、当該ゾーン△１におけるエリア□１～エリア□１２の順で溶接を行い、これをゾーン△４まで順に溶接を行う。このようにすると、伝熱管層５Ａを積層した方向での振止部材１４の間隔の均衡を保ち、かつ間隔調整および溶接の作業効率の低下が抑えられる。 And, welding is performed by combining each zone and each area. That is, starting from the zone Δ1, welding is performed in the order of the area □ 1 to the area □ 12 in the zone Δ1, and this is sequentially welded up to the zone Δ4. If it does in this way, the balance of the space | interval of the bracing member 14 in the direction which laminated | stacked the heat exchanger tube layer 5A is maintained, and the fall of the work efficiency of space | interval adjustment and welding is suppressed.
　このように、本実施の形態の蒸気発生器の製造方法は、伝熱管５の間に、振止部材１４を配置する蒸気発生器の製造方法において、伝熱管５の間に挿入されて隣接する各振止部材１４の間に間隔保持治具２５を配置し、各振止部材１４の間隔を保持する工程と、間隔保持治具２５にて間隔を保持されている各振止部材１４を相互に連結する態様で保持部材１６を各振止部材１４に溶接する工程と、保持部材１６を各振止部材１４に溶接した後に間隔保持治具２５を取り外す工程と、を含む。 As described above, the steam generator manufacturing method according to the present embodiment is inserted between the heat transfer tubes 5 and adjacent to each other in the steam generator manufacturing method in which the bracing member 14 is disposed between the heat transfer tubes 5. The spacing holding jig 25 is disposed between the respective bracing members 14 to hold the spacing between the respective bracing members 14 and the respective bracing members 14 held by the spacing holding jig 25. And a step of welding the holding member 16 to each bracing member 14 and a step of removing the interval holding jig 25 after welding the holding member 16 to each bracing member 14.
　この蒸気発生器の製造方法によれば、隣接する振止部材１４が保持部材１６を溶接することで連結され、各振止部材１４間の間隔は、溶接時に取り付けられて溶接後に取り外される間隔保持治具２５により保持される。このため、蒸気発生器の稼働時には、間隔保持治具２５は存在しない。この結果、隣接する振止部材１４を所定間隔で連結するとともに、当該所定間隔とする部材が蒸気発生器内に落下する事態を防ぐことが可能になる。 According to this method of manufacturing a steam generator, adjacent bracing members 14 are connected by welding holding members 16, and the spacing between the respective bracing members 14 is a spacing hold that is attached during welding and removed after welding. It is held by the jig 25. For this reason, the interval holding jig 25 does not exist when the steam generator is in operation. As a result, it is possible to connect adjacent anti-vibration members 14 at a predetermined interval and prevent a member having the predetermined interval from falling into the steam generator.
　また、本実施の形態の蒸気発生器の製造方法は、隣接する各振止部材１４の間に間隔保持治具２５を配置する工程では、隣接する各振止部材１４間の間隔を測定し、当該測定値に応じた寸法の間隔保持治具２５を用いる。 Further, in the method of manufacturing the steam generator according to the present embodiment, in the step of arranging the spacing holding jig 25 between the adjacent bracing members 14, the spacing between the neighboring bracing members 14 is measured, An interval holding jig 25 having a dimension corresponding to the measured value is used.
　この蒸気発生器の製造方法によれば、隣接する各振止部材１４間の間隔に応じた間隔保持治具２５を用いることで、設計公差を考慮して伝熱管５と振止部材１４との間隔Ｗが設計した要求となるように、隣接する振止部材１４を所定間隔で連結することが可能になる。 According to this method for manufacturing a steam generator, by using the interval holding jig 25 according to the interval between the adjacent anti-vibration members 14, the heat transfer tube 5 and the anti-vibration member 14 are considered in consideration of design tolerances. Adjacent bracing members 14 can be connected at a predetermined interval so that the interval W becomes a designed requirement.
　また、本実施の形態の蒸気発生器の製造方法は、伝熱管５は、Ｕ字形状に形成された円弧部を有し、当該円弧部の径が中央から外側に向けて大きなものを配列した伝熱管層５Ａとされ、かつ当該伝熱管層５Ａを重ねつつ最外周伝熱管の径を変えることで円弧部の部分が半球形状に形成され、振止部材１４は、各伝熱管層５Ａの間に挿入されるとともに、円弧部の外側に突出された端部が伝熱管層５Ａを積層した方向に沿いつつ半球形状に倣って並んで設けられた列をなし、かつ当該列が半球形状に倣って複数設けられており、各前記工程は、振止部材１４の端部の１つの列において半球状の中央から外側に至り行う。 Further, in the steam generator manufacturing method of the present embodiment, the heat transfer tube 5 has a circular arc portion formed in a U shape, and a large diameter is arranged from the center toward the outside. The heat transfer tube layer 5A is formed, and the arc portion is formed in a hemispherical shape by changing the diameter of the outermost heat transfer tube while overlapping the heat transfer tube layer 5A, and the bracing member 14 is provided between the heat transfer tube layers 5A. And an end projecting outward from the arc portion along the direction in which the heat transfer tube layers 5A are stacked along the hemispherical shape is formed, and the row follows the hemispherical shape. Each step is performed from the center of the hemisphere to the outside in one row at the end of the anti-vibration member 14.
　この蒸気発生器の製造方法によれば、振止部材１４の端部の列において、伝熱管群５１の半球状の中央から溶接を行うと、中央での振止部材１４の間隔を最初に決めることから、伝熱管層５Ａを積層した方向での振止部材１４の間隔の均衡が保ちやすくなる。この結果、精度の高い蒸気発生器を効率よく製造することが可能になる。 According to this steam generator manufacturing method, when welding is performed from the center of the hemispherical shape of the heat transfer tube group 51 in the end row of the bracing members 14, the interval between the bracing members 14 at the center is first determined. For this reason, it becomes easy to maintain the balance of the spacing of the bracing members 14 in the direction in which the heat transfer tube layers 5A are laminated. As a result, a highly accurate steam generator can be efficiently manufactured.
　また、本実施の形態の蒸気発生器の製造方法は、各前記工程は、振止部材１４の端部の各列において半球状の外側から中央に至り行う。 Further, in the method of manufacturing the steam generator of the present embodiment, each of the steps is performed from the outer side of the hemisphere to the center in each row of the end portion of the anti-vibration member 14.
　この蒸気発生器の製造方法によれば、振止部材１４の端部の各列において、半球状の外側のエリアは、図５に示すように管群外筒３に近く狭隘であるため、中央側と比較すると間隔調整および溶接の作業が難しい。さらに、間隔調整および溶接の作業は、前のエリアが調整されている分だけ後のエリアほど調整の予幅がなくなるため難しい。このため、伝熱管群５１の半球状の外側のエリアから中央のエリアに至り溶接を行うと、作業効率の低下が抑えられる。この結果、蒸気発生器を効率よく製造することが可能になる。 According to this steam generator manufacturing method, in each row of the end portions of the bracing member 14, the hemispherical outer area is narrow and close to the tube group outer tube 3 as shown in FIG. Compared to the side, it is difficult to adjust the distance and perform welding. Furthermore, the interval adjustment and the welding work are difficult because the pre-adjustment width of the subsequent area is lost as the previous area is adjusted. For this reason, when welding is performed from the hemispherical outer area of the heat transfer tube group 51 to the center area, a reduction in work efficiency is suppressed. As a result, the steam generator can be efficiently manufactured.
　また、本実施の形態の蒸気発生器の製造方法は、保持部材１６を各振止部材１４に溶接した後、伝熱管５と振止部材１４との間隔が所定間隔よりも大きい場合、当該各振止部材１４間を連結する保持部材１６の部位を収縮加熱により縮小調整する。 Moreover, the manufacturing method of the steam generator of this Embodiment WHEREIN: After welding the holding member 16 to each bracing member 14, when the space | interval of the heat exchanger tube 5 and the bracing member 14 is larger than predetermined spacing, each said The portion of the holding member 16 that connects the anti-vibration members 14 is reduced and adjusted by contraction heating.
　この蒸気発生器の製造方法によれば、各振止部材１４の間隔を所定間隔に補正することが可能になる。 According to this steam generator manufacturing method, it is possible to correct the interval between the respective bracing members 14 to a predetermined interval.
　１　蒸気発生器
　５　伝熱管
　５Ａ　伝熱管層
　５１　伝熱管群
　１４　振止部材
　１５　接合部材
　１６　保持部材
　１７　取付部
　２５　間隔保持治具
　２５ａ　間隔保持部
　２５ｂ　突起部
　２５ｃ　円弧部 DESCRIPTION OF SYMBOLS 1 Steam generator 5 Heat transfer tube 5A Heat transfer tube layer 51 Heat transfer tube group 14 Stall member 15 Joining member 16 Holding member 17 Mounting part 25 Spacing holding jig 25a Spacing holding part 25b Protrusion part 25c Arc part

Claims (5)

  1. 　伝熱管の間に、振止部材を配置する蒸気発生器の製造方法において、
    　前記伝熱管の間に挿入されて隣接する各前記振止部材の間に間隔保持治具を配置し、各前記振止部材の間隔を保持する工程と、
    　前記間隔保持治具にて間隔を保持されている各前記振止部材を相互に連結する態様で保持部材を各前記振止部材に溶接する工程と、
    　前記保持部材を各前記振止部材に溶接した後に前記間隔保持治具を取り外す工程と、
    　を含むことを特徴とする蒸気発生器の製造方法。     In a method for manufacturing a steam generator in which a bracing member is disposed between heat transfer tubes,
    A step of placing an interval holding jig between each of the adjacent anti-vibration members inserted between the heat transfer tubes, and maintaining an interval between the anti-vibration members;
    Welding the holding member to each of the bracing members in a manner of interconnecting the bracing members that are spaced apart by the gap holding jig;
    Removing the interval holding jig after welding the holding member to each of the bracing members;
    A method for producing a steam generator, comprising:
  2. 　隣接する各前記振止部材の間に間隔保持治具を配置する工程では、隣接する各前記振止部材間の間隔を測定し、当該測定値に応じた寸法の前記間隔保持治具を用いることを特徴とする請求項１に記載の蒸気発生器の製造方法。 In the step of disposing a gap holding jig between the adjacent bracing members, the gap between the neighboring bracing members is measured, and the gap holding jig having a dimension corresponding to the measured value is used. The method for producing a steam generator according to claim 1.
  3. 　前記伝熱管は、Ｕ字形状に形成された円弧部を有し、当該円弧部の径が中央から外側に向けて大きなものを配列した伝熱管層とされ、かつ当該伝熱管層を重ねつつ最外周伝熱管の径を変えることで前記円弧部の部分が半球形状に形成され、
    　前記振止部材は、各伝熱管層の間に挿入されるとともに、前記円弧部の外側に突出された端部が前記伝熱管層を積層した方向に沿いつつ半球形状に倣って並んで設けられた列をなし、かつ当該列が半球形状に倣って複数設けられており、
    　各前記工程は、前記振止部材の端部の１つの列において半球状の中央から外側に至り行うことを特徴とする請求項１または２に記載の蒸気発生器の製造方法。     The heat transfer tube has a circular arc portion formed in a U-shape, and is formed into a heat transfer tube layer in which a large diameter is arranged from the center toward the outside, and the heat transfer tube layer is overlapped with the heat transfer tube layer. By changing the diameter of the outer heat transfer tube, the arc portion is formed in a hemispherical shape,
    The bracing member is inserted between the heat transfer tube layers, and an end protruding outside the arc portion is provided along the hemispherical shape along the direction in which the heat transfer tube layers are stacked. And a plurality of such rows are provided following the hemispherical shape,
    3. The method of manufacturing a steam generator according to claim 1, wherein each of the steps is performed from a hemispherical center to an outer side in one row of end portions of the bracing member. 4.
  4. 　前記伝熱管は、Ｕ字形状に形成された円弧部を有し、当該円弧部の径が中央から外側に向けて大きなものを配列した伝熱管層とされ、かつ当該伝熱管層を重ねつつ最外周伝熱管の径を変えることで前記円弧部の部分が半球形状に形成され、
    　前記振止部材は、各伝熱管層の間に挿入されるとともに、前記円弧部の外側に突出された端部が前記伝熱管層を積層した方向に沿いつつ半球形状に倣って並んで設けられた列をなし、かつ当該列が半球形状に倣って複数設けられており、
    　各前記工程は、前記振止部材の端部の各前記列において半球状の外側から中央に至り行うことを特徴とする請求項１～３のいずれか一つに記載の蒸気発生器の製造方法。     The heat transfer tube has a circular arc portion formed in a U-shape, and is formed into a heat transfer tube layer in which a large diameter is arranged from the center toward the outside, and the heat transfer tube layer is overlapped with the heat transfer tube layer. By changing the diameter of the outer peripheral heat transfer tube, the arc part is formed into a hemispherical shape,
    The bracing member is inserted between the heat transfer tube layers, and an end protruding outside the arc portion is provided along the hemispherical shape along the direction in which the heat transfer tube layers are stacked. And a plurality of such columns are provided following the hemispherical shape,
    The method of manufacturing a steam generator according to any one of claims 1 to 3, wherein each of the steps is performed from the hemispherical outer side to the center in each row of the end portion of the anti-rest member. .
  5. 　前記保持部材を各前記振止部材に溶接した後、前記伝熱管と前記振止部材との間隔が所定間隔よりも大きい場合、当該各前記振止部材間を連結する保持部材の部位を収縮加熱により縮小調整することを特徴とする請求項１～４のいずれか一つに記載の蒸気発生器の製造方法。 After the holding member is welded to each of the bracing members, when the interval between the heat transfer tube and the bracing member is larger than a predetermined interval, the portion of the holding member that connects the respective bracing members is contracted and heated. The method for producing a steam generator according to any one of claims 1 to 4, wherein the reduction adjustment is performed by the method.
PCT/JP2011/074997 2010-11-09 2011-10-28 Method for producing steam generator WO2012063661A1 (en)

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EP2693149A1 (en) * 2012-08-02 2014-02-05 Mitsubishi Heavy Industries, Ltd. Heat exchanger, gap expansion jig of heat transfer tube, and method of disposing vibration suppression member

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JP2014070821A (en) * 2012-09-28 2014-04-21 Mitsubishi Heavy Ind Ltd Steam generator and steam generator assembly method

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JP2009168398A (en) * 2008-01-18 2009-07-30 Mitsubishi Heavy Ind Ltd Manufacturing method of steam generator and fixture
JP2009242823A (en) * 2008-03-28 2009-10-22 Netsusan Heat Kk Induction-heating apparatus
JP2009264279A (en) * 2008-04-25 2009-11-12 Toyota Industries Corp Motor-driven compressor

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JP2009168398A (en) * 2008-01-18 2009-07-30 Mitsubishi Heavy Ind Ltd Manufacturing method of steam generator and fixture
JP2009242823A (en) * 2008-03-28 2009-10-22 Netsusan Heat Kk Induction-heating apparatus
JP2009264279A (en) * 2008-04-25 2009-11-12 Toyota Industries Corp Motor-driven compressor

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2693149A1 (en) * 2012-08-02 2014-02-05 Mitsubishi Heavy Industries, Ltd. Heat exchanger, gap expansion jig of heat transfer tube, and method of disposing vibration suppression member

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