EP0647814B1 - Générateur de vapeur à éléments de blocage de la rue d'eau à pivotement - Google Patents

Générateur de vapeur à éléments de blocage de la rue d'eau à pivotement Download PDF

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Publication number
EP0647814B1
EP0647814B1 EP94402195A EP94402195A EP0647814B1 EP 0647814 B1 EP0647814 B1 EP 0647814B1 EP 94402195 A EP94402195 A EP 94402195A EP 94402195 A EP94402195 A EP 94402195A EP 0647814 B1 EP0647814 B1 EP 0647814B1
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EP
European Patent Office
Prior art keywords
block
tubes
steam generator
pin
tube plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94402195A
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German (de)
English (en)
French (fr)
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EP0647814A1 (fr
Inventor
Christian Valadon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Areva NP SAS
Original Assignee
Framatome SA
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Publication date
Application filed by Framatome SA filed Critical Framatome SA
Publication of EP0647814A1 publication Critical patent/EP0647814A1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/48—Devices or arrangements for removing water, minerals or sludge from boilers ; Arrangement of cleaning apparatus in boilers; Combinations thereof with boilers
    • F22B37/483—Devices or arrangements for removing water, minerals or sludge from boilers ; Arrangement of cleaning apparatus in boilers; Combinations thereof with boilers specially adapted for nuclear steam generators

Definitions

  • the present invention relates to a steam generator, in particular for a nuclear power plant, comprising an outer casing with a vertical axis, a horizontal tube plate, fixed in a sealed manner inside and at the lower end of the casing, a bundle of inverted U-shaped tubes, comprising vertical branches, respectively hot and cold, joined by a curved part at their upper end and traversed by a primary fluid yielding its calories, inside the exchanger, to a secondary fluid circulating in the outer casing, the branches of the tubes having their ends connected to the tube plate and opening out under the latter, respectively in an intake manifold for the hot primary fluid and an evacuation manifold for this cooled fluid, an inner envelope covering the bundle of tubes, the lower edge of which is spaced from the tube plate and delimits with the outer envelope there is an annular space traversed by the secondary fluid introduced inside this envelope into this space before vaporizing on contact with the tubes traversed by the primary fluid, means for extracting the vapor, disposed above the bundle of tubes in the outer casing, and means
  • the secondary fluid usually water, contains particles of matter, mainly in the form of iron oxides or copper compounds, or traces of other metals, which tend to deposit on the tube plate, in particular in the central region thereof, between the branches closest to the U-shaped tubes where the flow speed of the secondary fluid from one end to the other of the plate is insufficient to prevent the deposition of mud or other residues, harmful, because creating concentrations of corrosion agents along the external walls of these tubes.
  • the blocking or partial occupation means arranged in this central region generally called “water street”, by reference to the classic Anglo-Saxon expression in the technique of "tube lane blocking device”, the term blocking signifying rather obstructs this region, therefore aims to minimize the flow of secondary fluid in the corresponding passage between the closest tubes, in order to increase the lateral flow through the bundle, reducing the deposition mud in this passage.
  • These means are generally constituted by metal blocks, parallelepiped, mounted in a fixed position in the central region between the tubes and resting on the plate according to the diameter of the latter in this region (see FR-A-2,352,269).
  • the street of water constituting the aforementioned central region is or is not separated in the median plane of the generator by a vertical deflector, fixed to the tube plate and extending in the middle of the passage delimited between the branches of the tubes in this region, the blocking means being in one piece and housed in the latter in the first case, or formed by two symmetrical parts, disposed respectively on either side of the vertical deflector in the other, between this deflector and the branches of the tubes opposite.
  • the subject of the present invention is a steam generator of the aforementioned kind, in which the means for blocking the water street are arranged so as not to hinder the maintenance of the tube plate, in particular allowing access to that -this by tools introduced into the outer casing through suitable orifices, and also eliminating dead zones which are hardly or not accessible during the operations of cleaning the tube plate or servicing the tubes.
  • the generator considered comprising blocking means in the form of at least one block, preferably of generally parallelepipedal shape, housed in the central region, is characterized in that said block is articulated on an axis of fixed, horizontal pivoting mounted inside the outer casing and extending perpendicular to the median plane of said region between the hot and cold branches of the bundle tubes, so as to allow this block to tilt at away from the tube plate, clearing said region above this plate.
  • the pivot axis is supported by a yoke integral with the deflection and flow distribution plate carried by the inner envelope, extending parallel and above the tube plate.
  • the parallelepipedal block comprises at least one open housing, suitable for receiving a temporary immobilization pin, keeping the block in abutment on the tube plate, preventing it from being lifted under the effect of the flow secondary fluid flowing between the bundle of tubes, this pin being slidably mounted relative to the housing of the block so as to be able to release the latter and then authorize its tilting around the pivot axis.
  • the pin is supported by a closure cover closing an access and inspection hole formed in the outer envelope in the vicinity of the tube plate, substantially in the median plane of the central region.
  • the pin engages in its housing after passing through a sliding shutter, carried by the inner envelope covering the bundle of tubes and suitable for being brought in line with the parallelepipedic block, this pin comprising a telescopic mounting comprising a support finger integral with the cover penetrating into a blind bore formed in the pin, a return spring being mounted between the cover and a bearing shoulder on the pin, so as to exert on the latter a permanent engagement force in block housing.
  • a sliding shutter carried by the inner envelope covering the bundle of tubes and suitable for being brought in line with the parallelepipedic block
  • this pin comprising a telescopic mounting comprising a support finger integral with the cover penetrating into a blind bore formed in the pin, a return spring being mounted between the cover and a bearing shoulder on the pin, so as to exert on the latter a permanent engagement force in block housing.
  • the pin has a conical profile, able to cooperate with a homologous profile of the housing of the block.
  • the sliding shutter is supported by the inner envelope so as to be able to retract in the direction of the upper part thereof, after removal of the pin and release of the block, in order to allow free tilting of it, without disturbing the flow of the secondary fluid arriving through the annular space between the outer and inner envelopes.
  • the block is guided laterally in its tilting movement by two parallel slides, delimiting the sides of the central region between the tubes on either side of the block.
  • the slides are integral with the tube plate or the sliding shutter.
  • the block is made in one piece (in the case of a generator of the boiler type), or in two parallel parts (in the case of a generator of the economizer type), the pawn of immobilization being simple or split by overlapping in the latter case the vertical deflector secured to the tube plate.
  • the block is formed of a plurality of juxtaposed elements, arranged in the extension of one another in the longitudinal direction of the central region, these elements each comprising passage openings for the fluid. secondary.
  • FIG 1 there is shown schematically a steam generator of the boiler type illustrating a first possible embodiment of the invention.
  • This steam generator is designed to transfer heat between the primary water circuit and the secondary water / steam circuit of a pressurized water nuclear reactor.
  • the reference 10 designates the outer envelope of revolution, of vertical axis, of the steam generator.
  • This envelope 10 delimits an enclosed interior space which is separated into a primary lower zone and a secondary upper zone by a horizontal tube plate 12 tightly connected to the envelope 10.
  • a vertical partition 14 divides the primary lower zone, usually called a water box, into a intake manifold 16 and an evacuation manifold 18 of the water circulating in the primary circuit of the reactor.
  • Tubing 20 and 22, welded or forged or molded on the outer casing 10 of the steam generator connect the collectors 16 and 18 respectively to this primary circuit.
  • a bundle of inverted U-shaped tubes 24 is tightly connected to the tube plate 12, in the secondary upper zone delimited by the latter, so that the two ends of each of the tubes open respectively into the intake manifold 16 and in the discharge manifold 18.
  • the vertical branches 24a of the tubes 24 which open into the intake manifold 16 are called hot branches and the vertical branches 24b of the tubes 24 which open into the discharge manifold 18 are called cold branches .
  • the bundle of tubes 24 is surrounded and capped by an inner casing 26, arranged coaxially in the outer casing 10.
  • the upper horizontal wall of this inner casing 26 opens into water / vapor separators 28 surmounted by dryers 29 which communicate the space 27 formed inside the envelope 26 with a steam outlet pipe 30 located at the top of the outer envelope 10.
  • the lower edge of the inner envelope 26 is placed at a determined distance above the tube plate 12, so as to form a passage between an annular recirculation space 32 delimited between the envelopes 10 and 26 and the space 27 formed in the inner envelope 26.
  • the steam generator is supplied with secondary water by a toroidal feed distributor 38 located immediately above the annular recirculation space 32.
  • a feed pipe 34 passes through the outer casing 10 of the steam generator in leaktight manner and opens into the feed distributor 38.
  • the latter can in particular be connected to the annular recirculation space 32 by tubes 36 in the form of an inverted J.
  • Horizontal flow distribution plates 41 are mounted inside the inner casing 26. These plates have perforations making it possible to support the tubes 24 of the bundle over their entire height and to carry out a distribution radial as homogeneous as possible of the secondary water flow which rises in the casing 26.
  • the lower flow distribution plate designated by the reference 40 in Figure 1, is located slightly above the lower edge of the inner casing 26. It is distinguished from other plates 41 by the fact that it has an opening central 42 of relatively large section. This lower plate 40 thus makes it possible to prevent the secondary water descending through the annular recirculation space 32 from rising immediately as soon as it has crossed the lower edge of the inner envelope 26, which would in particular have the consequence of creating above the central part of the tube plate 12 a static area.
  • Figure 2 illustrates a steam generator practically identical to that shown in Figure 1, but this time of the so-called axial economizer type, the central region or street of water between the closest branches in the exchanger, being separated by a vertical partition 44, integral with the tube plate 12 and extending vertically from the latter.
  • the blocks occupying the water street are formed by means of separate elements, respectively 47 and 48, arranged on either side of the vertical partition 44.
  • FIGs 3 and 4 illustrate in more detail the structure of the shutter blocks 46 housed in the central region of the bundle of tubes in the case of a generator of the boiler type according to Figure 1, similar arrangements being of course implemented. works with the generator in Figure 2.
  • the blocks 46 have vertical support uprights 54 and are advantageously provided with orifices 56, intended not to unduly prevent the circulation of the secondary fluid.
  • These blocks rest side by side on the tube plate 12 extending transversely in the waterway and being associated, in the vicinity of this plate, with a longitudinal tube 49 for collecting sludge and other residues accumulating on where appropriate on the plate, being joined at one end substantially at the center of the plate to a collector 50, provided with sampling orifices 53, of the kind more particularly described in patent application FR-A-2 692 965 already cited , and extending at its opposite end so as to exit laterally from the plate under the lower end of the outer casing 10 to be connected by a conduit 52 associated with a hollow end piece 55 to an installation for eliminating this sludge or residues.
  • the blocks 46 partially occupying the street of water above the tube plate 12 are immobilized with respect to the latter, which causes the drawbacks already mentioned.
  • a yoke 60 for supporting a transverse axis 61, making it possible to articulate on this plate a block 62 for occupying the street d water, by means of a lateral extension of this block, as illustrated in the drawing.
  • the block 62 extends transversely in the generator, inside the region 64 constituting the water street between the branches closest to the tubes 24 and, in the normal position, during the use of the steam generator, rests at its lower end on a support sole 66 carried by the plate, or is directly in contact with the upper face of the latter.
  • a support sole 66 carried by the plate, or is directly in contact with the upper face of the latter.
  • an elongated slot 40a is also provided, the transverse dimension of which is slightly greater than that of this block, so as to allow the passage thereof. through the plate, as detailed below.
  • the block 62 thus pivotally mounted about its axis 61 must be immobilized in the position shown in Figures 5A and 5B, in particular to avoid that, under the effect of the flow of the secondary fluid coming from the intermediate space 32 and rising between the tubes 24 of the bundle after passing under the lower end of the inner envelope 26, this block does not rise in an inappropriate manner .
  • a blocking pin 68 secured to a cover 70 for closing an access or inspection hole.
  • suitable arranged in the side wall of the outer casing 10, in line with the deflection and distribution plate 40.
  • the pin 68 consists, in the embodiment considered but which is given only by way of indication, of a fixed finger 71, carried by the cover 70 towards the inside of the enclosure of the generator, and d an end piece 72, slidably mounted on the finger 71, this end piece comprising a support shoulder 73 for a spring 74 applied at its opposite end against the cover 70, so as to permanently exert a force on the end piece 72 and to allow the engagement of the end 75 thereof in a housing of the same shape 63, provided in the side wall opposite the block 62.
  • the end 75 of the end piece 72 of the pin 68 and the housing 63 of the block 62 which receives it both have a conical profile.
  • the lower end of the casing 26 with a sliding shutter 76, extending this casing downwards towards the pin 68, this shutter having a notch 77, adapted to overlap the tip 75 of the pin behind the shoulder 73, improving the immobilization of this pin and therefore of the block 62 in normal operation of the generator.
  • the shutter 76 is raised by sliding against the wall of the casing 26, advantageously in lateral guides 80 (FIG. 5B) fixed on the latter, so that, after removal of the pin and raising the shutter, the block 62 can be tilted without risk of encountering any obstacle which would prevent its pivoting.
  • Figures 6 and 7 illustrate an alternative embodiment where the block 62 occupying the water street is arranged so as to have a substantially greater longitudinal dimension, for example being made up of three juxtaposed elements, respectively 82, 84 and 86, each provided with at least one orifice for the passage of the secondary fluid, these elements being secured to each other and arranged in the extension one of the other.
  • the first element 82 located furthest to the left in Figure 6, has an extension for the articulation of the block 62 around the axis 61 on the yoke 60 carried by the plate 40, while the opposite element 86 has a greater height dimension and is if necessary fitted with a protective jacket 88.
  • slides 90 are arranged parallel to the lateral faces of this element, these slides being secured to the plate 12 in the example. represented.
  • they could be carried by another fixed structure of the generator inside the region 64, if necessary even by the lower end of the sliding shutter 76, the withdrawal of the latter upwards against the wall of the inner casing 26, not preventing the positioning of these slides at an appropriate level for, precisely, guiding the block in its pivoting movement without of course hampering or hindering it.
  • FIGS. 8 and 9 show diagrammatically the adaptation of the arrangements implemented in a steam generator of the boiler type according to FIG. 1, to a generator of the economiser type according to FIG. 2.
  • FIG 8 there is shown a fraction of the vertical partition 44 which extends longitudinally in the water street, the parallelepipedal block 62 consisting of two blocks similar, respectively 62a and 62b, articulated together around the axis 61 and arranged parallel to each other on each side of the partition 44.
  • the invention thus makes it possible to arrange the street water of a steam generator, of the boiler or economiser type, in a particularly advantageous manner, by ensuring the obstruction or the "blocking" of the corresponding region in the center of the generator between the branches of the closest tubes, without limiting the possibilities of maintenance and servicing of the generator, in particular to allow the passage towards the center of the tube plate of the tools necessary for checking or repairing the tubes or of the plate.
  • the pivoting mounting of the blocks is carried out so that, thanks to the immobilization pins, themselves locked by the sliding shutter of the inner casing, the device does not present any risk of the blocks taking off or being lifted during the use in service of the generator, notably under the effect of the pressure and / or the speed of the secondary fluid in circulation.
  • the assembly is simple to produce, does not present any difficulties for its installation in the generator water street and can be very easily implemented, in particular when the generator is stopped, by deploying only the effort required to tilt the block to clear the region that occupies it.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
EP94402195A 1993-10-08 1994-09-30 Générateur de vapeur à éléments de blocage de la rue d'eau à pivotement Expired - Lifetime EP0647814B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9312031 1993-10-08
FR9312031A FR2711008B1 (fr) 1993-10-08 1993-10-08 Générateur de vapeur à éléments de blocage de la rue d'eau à pivotement.

Publications (2)

Publication Number Publication Date
EP0647814A1 EP0647814A1 (fr) 1995-04-12
EP0647814B1 true EP0647814B1 (fr) 1997-06-11

Family

ID=9451680

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94402195A Expired - Lifetime EP0647814B1 (fr) 1993-10-08 1994-09-30 Générateur de vapeur à éléments de blocage de la rue d'eau à pivotement

Country Status (9)

Country Link
US (1) US5492169A (cg-RX-API-DMAC7.html)
EP (1) EP0647814B1 (cg-RX-API-DMAC7.html)
JP (1) JPH07158801A (cg-RX-API-DMAC7.html)
KR (1) KR950012479A (cg-RX-API-DMAC7.html)
CN (1) CN1106531A (cg-RX-API-DMAC7.html)
DE (1) DE69403747D1 (cg-RX-API-DMAC7.html)
FR (1) FR2711008B1 (cg-RX-API-DMAC7.html)
TW (1) TW268130B (cg-RX-API-DMAC7.html)
ZA (1) ZA947490B (cg-RX-API-DMAC7.html)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8238114B2 (en) 2007-09-20 2012-08-07 Ibiden Co., Ltd. Printed wiring board and method for manufacturing same
TWI394506B (zh) 2008-10-13 2013-04-21 Unimicron Technology Corp 多層立體線路的結構及其製作方法
JP2012220043A (ja) * 2011-04-04 2012-11-12 Mitsubishi Heavy Ind Ltd 蒸気発生器
US9233402B2 (en) 2011-11-22 2016-01-12 Techtronic Floor Care Technology Limited Scaling reduction in a boiler used in a surface cleaning apparatus
US9892806B2 (en) * 2012-05-04 2018-02-13 Smr Inventec, Llc Space saver flanged joint for a nuclear reactor vessel
US11901088B2 (en) 2012-05-04 2024-02-13 Smr Inventec, Llc Method of heating primary coolant outside of primary coolant loop during a reactor startup operation
CN103673723B (zh) * 2013-12-21 2015-09-09 哈尔滨锅炉厂有限责任公司 壳程整体包壳结构的换热器
CN104197307B (zh) * 2014-08-25 2015-12-30 华北电力大学 一种具有高效传热性能的蒸汽发生器支撑隔板结构

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4037569A (en) * 1976-01-30 1977-07-26 Westinghouse Electric Corporation Flow distribution arrangement for a steam generator
US4079701A (en) * 1976-05-17 1978-03-21 Westinghouse Electric Corporation Steam generator sludge removal system
US4664178A (en) * 1985-10-30 1987-05-12 Westinghouse Electric Corp. One-piece removable tube lane blocking device for nuclear steam generator
US5104611A (en) * 1989-11-13 1992-04-14 Combustion Engineering, Inc. Flow blocker for access opening
FR2690224B1 (fr) * 1992-04-15 1994-06-03 Framatome Sa Generateur de vapeur equipe d'un dispositif de deflection et de purge perfectionne.

Also Published As

Publication number Publication date
JPH07158801A (ja) 1995-06-20
KR950012479A (ko) 1995-05-16
ZA947490B (en) 1995-08-17
TW268130B (cg-RX-API-DMAC7.html) 1996-01-11
FR2711008A1 (fr) 1995-04-14
EP0647814A1 (fr) 1995-04-12
FR2711008B1 (fr) 1995-11-24
DE69403747D1 (de) 1997-07-17
US5492169A (en) 1996-02-20
CN1106531A (zh) 1995-08-09

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