EP0647815A1 - Dampferzeuger mit übereinandergesetzten Blockierungselementen in einer Rohrgasse - Google Patents

Dampferzeuger mit übereinandergesetzten Blockierungselementen in einer Rohrgasse Download PDF

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Publication number
EP0647815A1
EP0647815A1 EP94402196A EP94402196A EP0647815A1 EP 0647815 A1 EP0647815 A1 EP 0647815A1 EP 94402196 A EP94402196 A EP 94402196A EP 94402196 A EP94402196 A EP 94402196A EP 0647815 A1 EP0647815 A1 EP 0647815A1
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EP
European Patent Office
Prior art keywords
blocks
steam generator
stack
block
generator according
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.)
Withdrawn
Application number
EP94402196A
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English (en)
French (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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Framatome SA filed Critical Framatome SA
Publication of EP0647815A1 publication Critical patent/EP0647815A1/de
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
    • F22B37/483—Devices for removing water, salt, or sludge from boilers; Arrangements 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.
  • 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 in which the blocking means are in the form of a plurality of blocks, preferably of generally parallelepipedal shape, removable, these blocks being capable of being individually extracted or placed in the central region, in the inner envelope of the generator, through an access passage formed laterally therein, is characterized in that the blocks are superimposed in the central region to form a stack resting on the tube plate, these blocks being immobilized at their ends close to the axis of the envelope by means of a bridge stop, integral with the tube plate, extending perpendicularly to the latter and to the direction of the blocks stacked in the central region, an anti-theft blocking member being provided at the opposite ends of the blocks to prevent them from being lifted from the tube plate.
  • the bridge immobilization stop for the blocks comprises an opening for receiving the end of the latter, comprising a face having a recessed slope formed opposite a homologous profile provided on the block disposed at the part top of the stack.
  • the superimposed blocks each comprise at least one orifice for circulation of the secondary fluid; preferably also, the stop trigger guard has an inverted U-shaped arch profile, the central part of which has the embedding slope.
  • the blocking blocking device for blocking the stack of blocks comprises a support stop, arranged under the lower end of the inner envelope and in contact with the block at the upper part of the stacking, this stop being immobilized against this block by means of a shutter engaged in the access passage through which the blocks are put in place and extracted from the enclosure.
  • the shutter has one end with a substantially conical profile, cooperating with an inclined face which is homologous to the support stop.
  • the bearing stop comprises a flat face on which a piston is applied, slidably mounted in the shutter under the effect of a thrust spring housed between the shutter and a tight closing cover of the passage. access.
  • the support stop comprises at least one lug penetrating into a housing formed in the block disposed at the upper part of the stack.
  • the tube plate comprises at least one pin for centering the block arranged at the lower part of the stack, so that the latter is thus maintained in the upper part and in the lower part, opposite from the tube plate.
  • each block has in its upper face a centering stud capable of cooperating with a hole (blind or opening) of the block superimposed in the stack.
  • each block has a rib forming a slide for the positioning of successive blocks superimposed in the stack.
  • the blocks superimposed in the stack are separated from one block to the next by a sliding sole, having a flat face, engaged between two successive blocks and an external vertical rim, for holding the block located under the sole.
  • the stack of superimposed blocks is surrounded, along its lateral sides, by parallel guide rails, mounted in line with the access passage formed in the outer envelope.
  • each of these blocks possibly the block disposed at the top of said stack, comprises a curved metal blade, forming a spring, mounted between the end of the block opposite to the trigger guard and the inner wall of the outer casing.
  • each of them usefully comprises, opposite the access passage in the outer envelope, an ear provided with a gripping hole.
  • 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 an intake manifold 16 and an evacuation manifold 18 of the water circulating in the primary circuit of the reactor.
  • An inverted U-shaped tube bundle 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 supply of secondary steam to the steam generator is carried out by a toroidal feed distributor 38 located immediately above the annular recirculation space 32.
  • a feed pipe 34 passes tightly through the outer casing 10 of the steam generator and opens into the feed distributor 38.
  • the latter can in particular be connected to the annular recirculation space 32 by inverted J-shaped tubes 36.
  • Horizontal flow distribution plates 40 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 achieve 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 times 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 this one.
  • 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, by being joined at one end substantially in the center of the plate to a manifold 50, provided with sampling orifices 53, of the kind more particularly described in patent application 92 07903 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 removing these sludges or residues.
  • a stack 62 formed of a set of juxtaposed parallelepipedal blocks, these blocks being removable in the manner described below.
  • the stack consists, from a support sole 64 on the tube plate 12, of three individual blocks, respectively 66, 68 and 70, each of these blocks, in the form general of elongated parallelepiped, extending in the longitudinal direction of region 60, consisting of several adjacent elements, integral with one another according to the length of the block considered, such as 66a, 66b and 66c for the block lower 66 for example, the upper block itself being formed of three homologous elements 70a, 70b and 70c.
  • the elements constituting the blocks of the stack comprise transverse orifices 72 for the circulation of the secondary fluid.
  • the blocks of the stack 62 cooperate with a bridge immobilization stop 74, having in the form of an inverted U-shaped arch overlapping the blocks, the lower ends of this stop being made integral during the construction of the generator of the support sole 64.
  • the stop is arranged practically at the end of the stack blocks, and internally has an inclined embedding slope 75, under which engages the nose 76 of the element 70a of the upper block 70 of the stack, shaped so as to have the same profile as the embedding slope 75.
  • the various blocks 66, 68 and 70 of the stack are preferably provided with an external sliding sole 78.
  • the sole 64 secured to the tube plate 12 on the one hand preferably the upper face of the protective jacket of each of the blocks 66 and 68 (excluding the upper block 70) on the other hand, have pins 80 which engage mutually, from one block to the next, in a hole 81 made in the sole sliding block superimposed on the lower part of the latter.
  • the positioning of the various blocks in the stack could be achieved by means of guide grooves cooperating with ribs from one block to the other, or even by means of appropriate slides.
  • the stack 62 of the various blocks thus superimposed is also blocked against the soleplate 64 and the tube plate 12 by means of a blocking member 82, constituting an anti-flight element for the various blocks, in particular under the effect of the thrust exerted by the secondary fluid under pressure which circulates in the generator coming from the annular space 32 and passing through the bundle of tubes under the lower end of the inner casing 26.
  • the blocking member 82 mainly comprises a support stop 84 and a shutter 86.
  • the stop 84 is in the form of a shoe, applied against the upper face of the last block 70 in the stack 62, this stop advantageously comprising at least one and preferably two lugs 85 (see FIG. 6), each engaged at through a slot 87 formed in the protective jacket of this block, in line with its element 70.
  • the stop also has an inclined face 88 against which applies a bearing of the same profile 89 of the shutter 86, itself resting on its opposite edge against a slide 90 fixed to the lower end of the inner casing 26.
  • the shutter 86 is permanently subjected to the action of a return spring 91 which rests on the opposite side on a cover (not shown) closing an access passage formed in the external envelope 10 of the generator, the diametrical dimensions of this passage being determined by construction so that they can allow the introduction or the withdrawal of each of the blocks 66, 68 or 70 in the enclosure of the generator.
  • the upper block 70 comprises, in its straight part directed towards the internal wall of the external envelope 10, an extension 93 provided, as seen in more detail in Figures 7 to 9, with flanges 94 and 95, allowing to imprison the ends and consequently to keep curved a leaf spring 96, able to come to bear against this internal wall, so as to immobilize the stack, thus held at its left end by the trigger guard 74 and his straight end opposite by the anti-takeoff member 82 with its support stop 84.
  • the sliding sole 78 of the upper block 70 has in its lower face supported on the block 68, at the end of the element 70c, a return 97 forming an angle iron, completing the immobilization of this block vis-à-vis of those located under it in stack 62.
  • the blocks which constitute this stack can be on demand, and in particular outside the normal phases of use of the generator, in particular during periods requiring maintenance of the tube plate or of the bundle. , or even when it is necessary to intervene on the connection between these tubes and the plate, be easily installed or extracted from the generator enclosure.
  • Figure 10 illustrates schematically, but on a larger scale, along a plane perpendicular to the median plane of the central region 60 or water street, the corresponding part of the latter with in particular the vertical partition 44, implemented when the generator is of the economiser type, unlike the solution more particularly envisaged with the example of FIGS. 5 to 9, concerning a generator of the boiler type.
  • the stack 62 of the blocks is split, each of the blocks 66, 68 and 70 being separated between two adjacent blocks arranged symmetrically on either side of the partition 44
  • the upper block 70 thus consists of two symmetrical blocks 70/1 and 70/2, each of these blocks being associated with a shutter 86/1 and 86/2 housed side by side in the access passage. 92.
  • FIGS. 12 and 13 illustrate other alternative embodiments of the stack 62 of the various blocks 66, 68 and 70, with different structural modifications, both for these blocks and for the holding members, immobilization and guidance with which they are associated.
  • the support stop 84 is directly secured to the shutter 86 mounted in the passage 92 of the outer casing 10, in the manner of a piston subjected to the effect of the support spring 91, the front end of this stop comprising a groove 100 cooperating with a key 102 provided in the upper face of the block 70.
  • each of the blocks of the stack 62 is advantageously provided with a gripping lug 104, provided with a hole 106 for the passage of a hook or the like (not shown), making it possible to grasp or deposit each of the blocks successively.
  • the stop 84 and the shutter 86 are again distinct, this stop being immobilized in the blocking position of the stack 62 by a bearing surface 108 engaged under the end of the plate deflection 40.
  • the two upper blocks 68 and 70 are capable of being linked to each other, once put in place by a screw-nut assembly 110.
  • the invention thus makes it possible, whatever the variant chosen, to ensure the installation inside the water street of the steam generator, of effective "blocking" means, achieving a suitable obstruction of the region. corresponding during operation of the generator, these means being able to be removed in a particularly simple manner to release this region and allow access to the plate and to the bundle of tubes in the vicinity thereof, by any desired maintenance or repair tool.
  • the removable blocks offered and the various arrangements provided for immobilizing them give the stack great security, in particular to with regard to the thrust of the secondary fluid, the association of a trigger guard at one end, of an anti-flight device to the other, making it possible to keep the blocks in abutment on the tube plate, whatever generator operating conditions.

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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)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)
EP94402196A 1993-10-08 1994-09-30 Dampferzeuger mit übereinandergesetzten Blockierungselementen in einer Rohrgasse Withdrawn EP0647815A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9312032 1993-10-08
FR9312032A FR2711009B1 (fr) 1993-10-08 1993-10-08 Générateur de vapeur à éléments de blocage de la rue d'eau superposés.

Publications (1)

Publication Number Publication Date
EP0647815A1 true EP0647815A1 (de) 1995-04-12

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EP94402196A Withdrawn EP0647815A1 (de) 1993-10-08 1994-09-30 Dampferzeuger mit übereinandergesetzten Blockierungselementen in einer Rohrgasse

Country Status (8)

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US (1) US5529020A (de)
EP (1) EP0647815A1 (de)
JP (1) JPH07158802A (de)
KR (1) KR950012478A (de)
CN (1) CN1106532A (de)
FR (1) FR2711009B1 (de)
TW (1) TW295668B (de)
ZA (1) ZA947495B (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2851031B1 (fr) * 2003-02-12 2005-05-06 Framatome Anp Generateur de vapeur comportant un dispositif de fourniture d'eau d'alimentation realisant le piegeage de corps etrangers
JP2012220043A (ja) * 2011-04-04 2012-11-12 Mitsubishi Heavy Ind Ltd 蒸気発生器
CN103867715B (zh) * 2012-12-11 2016-08-03 中国核动力研究设计院 一种管束套筒开孔的盖板式密封装置

Citations (4)

* 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
FR2352269A1 (fr) * 1976-05-17 1977-12-16 Westinghouse Electric Corp Systeme pour eliminer les depots de boues dans les generateurs a vapeur
EP0077255A1 (de) * 1981-10-06 1983-04-20 Framatome Verfahren und Einrichtung zum Entfernen von Schlamm an der Rohrplatte von Dampferzeugern
FR2597577A1 (fr) * 1986-04-16 1987-10-23 Westinghouse Electric Corp Echangeur de chaleur pour generateur de vapeur, notamment de centrale nucleaire

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2690224B1 (fr) * 1992-04-15 1994-06-03 Framatome Sa Generateur de vapeur equipe d'un dispositif de deflection et de purge perfectionne.

Patent Citations (4)

* 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
FR2352269A1 (fr) * 1976-05-17 1977-12-16 Westinghouse Electric Corp Systeme pour eliminer les depots de boues dans les generateurs a vapeur
EP0077255A1 (de) * 1981-10-06 1983-04-20 Framatome Verfahren und Einrichtung zum Entfernen von Schlamm an der Rohrplatte von Dampferzeugern
FR2597577A1 (fr) * 1986-04-16 1987-10-23 Westinghouse Electric Corp Echangeur de chaleur pour generateur de vapeur, notamment de centrale nucleaire

Also Published As

Publication number Publication date
US5529020A (en) 1996-06-25
FR2711009A1 (fr) 1995-04-14
KR950012478A (ko) 1995-05-16
TW295668B (de) 1997-01-11
ZA947495B (en) 1995-09-28
CN1106532A (zh) 1995-08-09
FR2711009B1 (fr) 1995-11-24
JPH07158802A (ja) 1995-06-20

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