EP0566477B1 - Générateur de vapeur équipé d'un dispositif de déflexion et de purge - Google Patents

Générateur de vapeur équipé d'un dispositif de déflexion et de purge Download PDF

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Publication number
EP0566477B1
EP0566477B1 EP93400959A EP93400959A EP0566477B1 EP 0566477 B1 EP0566477 B1 EP 0566477B1 EP 93400959 A EP93400959 A EP 93400959A EP 93400959 A EP93400959 A EP 93400959A EP 0566477 B1 EP0566477 B1 EP 0566477B1
Authority
EP
European Patent Office
Prior art keywords
deflection
purging
steam generator
box
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
EP93400959A
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German (de)
English (en)
French (fr)
Other versions
EP0566477A1 (fr
Inventor
Thierry Daffos
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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Filing date
Publication date
Application filed by Framatome SA filed Critical Framatome SA
Publication of EP0566477A1 publication Critical patent/EP0566477A1/fr
Application granted granted Critical
Publication of EP0566477B1 publication Critical patent/EP0566477B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • 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
    • 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

Definitions

  • the invention relates to a steam generator designed for use in a pressurized water nuclear reactor, the secondary part of which is fitted, in the immediate vicinity of the tube plate, with a deflection and purge device of original design.
  • a steam generator equipping a nuclear power plant usually comprises an outer envelope, of vertical axis, the interior space of which is divided into two parts, in the direction of the height, by a horizontal plate called “tube plate” (in English, "tube sheet”).
  • the ends of the tubes of an inverted U-shaped tube bundle are fixed on the tube plate and open below it respectively in an intake manifold and in a collector for evacuating the water circulating in the circuit.
  • reactor primary called “primary water”.
  • the water circulating in the secondary circuit of the steam generator called “secondary water” is a mixture of water called “food water” coming from outside the steam generator and water called “recirculated water coming from the part upper part of the steam generator.
  • Food water is injected into the part of the steam generator located above the tube plate by a supply distributor, in toric or semi-toric form. supply is usually placed above an annular recirculation space formed between the outer casing and an inner casing covering the tube bundle and the lower edge of which is spaced from the tube plate.
  • Another problem which arises in the area of the steam generator situated immediately above the tube plate relates to the homogenization of the temperature of the mixture between the drinking water introduced into the generator by its supply manifold and the recirculation water from the water / steam separators placed in the upper part of the generator and which descends through the annular recirculation space. It is also desirable to ensure good regulation of the flow rates of this mixture before it rises in the inner envelope around the bundle tubes.
  • document US-A-4 664 178 describes a steam generator equipped with purge piping near the tube plate and comprising L-shaped deflection means mounted above the purge piping, at the base of the inner casing covering the tube bundle.
  • the invention specifically relates to a steam generator with inverted U tubes, comprising deflection and purging means of a new type, consisting of a single structure simultaneously fulfilling these two functions.
  • the deflection box and purge extends in height up to an intermediate level between the flow distribution plate and the lower edge of the inner casing.
  • manholes formed in the latter as well as in the outer casing of the steam generator open immediately above the longitudinal ends of the deflection and purge box.
  • the deflection and purge box according to the invention is connected to drainage means by at least one drainage tube which opens at at least one of the ends of the box, at the bottom of the latter.
  • At least two drainage tubes open laterally into a central part of the deflection and purge box, on either side of this box, which has orifices facing the tube plate. This feature improves the efficiency of the drainage in the central part of the steam generator located immediately above the tube plate.
  • the deflection and purge box has a bottom forming a longitudinal recovery groove into which the purge orifices open.
  • the deflection and purge box can have a uniform cross-section over its entire length or, on the contrary, can change.
  • the invention applies equally to all types of tube plate steam generators and in particular to steam generators of the "boiler” type, such as to steam generators of the "axial preheater” type.
  • the deflection and purge box rests on the tube plate by means of support studs between which the purge orifices are formed.
  • a vertical separation plate is placed between the hot and cold branches of the bundle tubes and connected to the tube plate.
  • the deflection and purge box comprises two parts located on either side of the separation plate and supported by this plate.
  • 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.
  • 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 interior envelope 26, arranged coaxially in the exterior envelope 10.
  • the upper horizontal wall of this interior envelope 26 opens into water / vapor separators 28 surmounted by dryers 29 which communicate the space 27 formed inside the casing 26 with a steam outlet pipe 30 situated at the top of the outer casing 10.
  • the lower edge of the inner casing 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 delimited in the interior 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 tubes 36 in the form of an inverted J.
  • 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 41 in FIG. 1, is situated slightly above the lower edge of the inner casing 26. It is distinguished from the other plates 40 by the fact that it has an opening central 42 of relatively large section. This lower plate 41 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 casing 26, which would in particular have the effect of creating a static area above the central part of the tube plate 12.
  • a deflection and purge box 44 is mounted in the space formed between the tube plate 12, the lower flow distribution plate 41 and the hot 24a and cold 24b branches of the tubes 24.
  • This space is designated by the reference 46 in Figure 4.
  • the deflection and purge box 44 extends horizontally and radially over the entire length of the space 46, up to the proximity of the inner casing 26.
  • the deflection and purge box 44 rests on the tube plate 12 by means of support studs 48 which guarantee a spacing between the bottom of the box and the upper face of the tube plate.
  • This spacing allows purge orifices 50 formed in the bottom of the box 44 to drain inside this box the secondary fluid which is in the immediate vicinity of the tube plate 12 in the space 46.
  • the purge orifices 50 open out between the support pads 48.
  • they are advantageously more numerous and / or of larger section in the central part of the steam generator than near the outer casing 10, in order to favor drainage in this central part, in which the displacements of the secondary fluid are the smallest.
  • vent 72 ( Figures 3 and 4) is formed on the roof of the deflection box 44, in the central part of the steam generator. This vent ensures the penetration of the secondary fluid into the box 44 when the steam generator is put into water.
  • the deflection and purge box 44 has a substantially rectangular shape in cross section and extends in height from the support pads 48 to a level lower than that of the lower flow distribution plate 41 and higher than that of the lower edge of the inner casing 26.
  • the box 44 thus provides a deflector function, that is to say that it constitutes a obstacle which opposes a horizontal flow of the secondary fluid in a transverse direction relative to this box.
  • the deflection and purge box 44 thus fulfills the functions of homogenizing the temperature of the secondary fluid before it rises in space 27 and contributes to a good distribution of the flow rates of this fluid near the tube plate 12.
  • the drainage means 54 make it possible to pump a small amount of secondary fluid out of the steam generator, in order to check the chemical concentrations of this fluid to keep them at a level acceptable and to remove suspended solids which tend to deposit in space 46 on the tube plate 12.
  • the bottom of the box 44 forms a horizontal recovery groove 55, in the bottom of which open the drain holes 50.
  • the groove 55 has for example, as illustrated in FIG. 4, a V-shaped section. This shape can in particular be obtained by machining the upper face of a rail 56 forming the bottom of the box 44 and by which the latter rests on the support pads 48.
  • the rest of the box 44 can be constituted by a plate 58 folded to form a U whose ends are welded to the lateral faces of the rail 56.
  • the ends of the box 44 are also formed by plates welded to the plate 58 and to the rail 56.
  • the drainage tubes 52 are welded to the latter plates, so as to open into the bottom of the V machined on the upper face of the rail 56.
  • the substantially rectangular shape presented in section by the box 44 in the embodiment shown can optionally be replaced by a square, triangular or other shape.
  • the box 44 can also have an evolving cross section as it has been illustrated for example in phantom. This evolving section can in particular lead to reducing the height of the box in the central part of the steam generator, compared to the height presented by this box near the inner casing 26. In this way, the efficiency of the samples of the secondary fluid which are carried out in the central part of the space 46.
  • the samples in the central part of the steam generator can be further improved by adding to the deflection and purge box 44 two purge tubes 60 which are connected on each side lateral of the box 44, in the central part of the latter and also comprise, in the lower part, purge orifices 62 facing the tube plate 12.
  • the geometry of the deflection and purge box 44 is also designed to take account of the requirements linked to the maintenance operations which must be able to be carried out on the steam generator, at the base of the bundle of tubes 24.
  • the upper wall of the box 44 is located substantially at the same level as the lower edge of inspection holes 64 formed in the inner casing 26 of the steam generator.
  • These inspection holes 64 are themselves formed in front of inspection holes 66 provided in the outer casing 10 of the generator and normally closed by plugs (not shown). As illustrated in FIG. 3, the inspection holes 64 and 66 are located in the extension of the space 46, in order to allow operators to access between the hot and cold branches of the tubes 24 of the bundle.
  • the invention is not limited to steam generators of the boiler type, but also applies to steam generators of the axial preheater type, in which a vertical separation plate 68 is disposed between the hot 24a and cold 24b branches of the tubes 24 and connected on the tube plate 12.
  • This connection can in particular be ensured by fitting a profile 69 in inverted U forming the lower edge of the separation plate 68 on a rib 13 welded on or mechanically fixed to the upper face of the plate to tubes 12, in the axis of the water street.
  • the deflection and purge box 44 comprises two compartments 45, located on either side of the plate 68 and arranged symmetrically with respect to the latter. As illustrated in FIGS. 5 and 6, these two compartments 45 can be delimited by two plates 70 folded and welded on either side of the separation plate 68, to define two separate compartments.
  • each of them comprises, in the bottom of the box 44, purge orifices 50 whose section and / or number decreases from the center of the generator vapor towards its periphery.
  • the bottom of each of the compartments 45, in which the purge orifices 50 are made is inclined downward as it approaches the separation plate 68, in order to promote the drainage of the fluid secondary.
  • the roof of each of the compartments 45 is inclined upwards as it approaches the separation plate 68, in order to bend upwards the flow of secondary fluid.
  • each of the compartments 45 of the deflection and purge box communicates with drainage means (not shown) situated outside the steam generator by a separate drainage tube 52, at each end of the box 44.
  • the roof of each of the compartments of the deflection and purge box 44 comprises, in the central part of the steam generator, at least one vent 72 (FIG. 5) ensuring penetration secondary fluid in the box 44 through the purge orifices 50 when the steam generator is put into water.
  • the steam generator in this case comprises an intermediate semi-cylindrical envelope 74 which externally doubles the internal envelope 26, in the part of the latter surrounding the cold branches of the tubes 24.
  • the feed toroid 38 of FIG. 1 then has a semicircular shape, in order to supply potable water only with the space formed between the inner envelope 26 and the intermediate envelope 74.
  • the ends of the box 44 can then be closed off by the intermediate envelope 74.
  • the deflection and purge box 44 fulfills the same functions as in the first embodiment described and moreover has the same characteristics.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Separating Particles In Gases By Inertia (AREA)
EP93400959A 1992-04-15 1993-04-13 Générateur de vapeur équipé d'un dispositif de déflexion et de purge Expired - Lifetime EP0566477B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9204642A FR2690224B1 (fr) 1992-04-15 1992-04-15 Generateur de vapeur equipe d'un dispositif de deflection et de purge perfectionne.
FR9204642 1992-04-15

Publications (2)

Publication Number Publication Date
EP0566477A1 EP0566477A1 (fr) 1993-10-20
EP0566477B1 true EP0566477B1 (fr) 1996-02-28

Family

ID=9428906

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93400959A Expired - Lifetime EP0566477B1 (fr) 1992-04-15 1993-04-13 Générateur de vapeur équipé d'un dispositif de déflexion et de purge

Country Status (8)

Country Link
US (1) US5335631A (enrdf_load_stackoverflow)
EP (1) EP0566477B1 (enrdf_load_stackoverflow)
JP (1) JPH06129601A (enrdf_load_stackoverflow)
KR (1) KR930022389A (enrdf_load_stackoverflow)
CN (1) CN1033829C (enrdf_load_stackoverflow)
DE (1) DE69301624D1 (enrdf_load_stackoverflow)
FR (1) FR2690224B1 (enrdf_load_stackoverflow)
TW (1) TW221486B (enrdf_load_stackoverflow)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2711008B1 (fr) * 1993-10-08 1995-11-24 Framatome Sa Générateur de vapeur à éléments de blocage de la rue d'eau à pivotement.
FR2711009B1 (fr) * 1993-10-08 1995-11-24 Framatome Sa Générateur de vapeur à éléments de blocage de la rue d'eau superposés.
KR100900730B1 (ko) * 2007-11-09 2009-06-05 한국원자력연구원 일체형원자로 유동혼합을 위한 증기발생기카세트 구조
JP2012220043A (ja) * 2011-04-04 2012-11-12 Mitsubishi Heavy Ind Ltd 蒸気発生器
JP2012220077A (ja) * 2011-04-07 2012-11-12 Mitsubishi Heavy Ind Ltd 蒸気発生器用給水管
CN109681858A (zh) * 2019-01-30 2019-04-26 中广核工程有限公司 一种用于压水堆核电站蒸汽发生器的泥渣收集装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH560351A5 (enrdf_load_stackoverflow) * 1973-01-09 1975-03-27 Sulzer Ag
US4566406A (en) * 1983-07-13 1986-01-28 Westinghouse Electric Corp. Sludge removing apparatus for a steam generator
US4704994A (en) * 1986-04-16 1987-11-10 Westinghouse Electric Corp. Flow boosting and sludge managing system for steam generator tube sheet
EP0315870B1 (de) * 1987-11-11 1990-09-12 Siemens Aktiengesellschaft Dampferzeuger
US4972804A (en) * 1989-04-25 1990-11-27 Alexander T. Kindling Method and apparatus for organizing the flow of fluid in a vertical steam generator
US5088451A (en) * 1990-04-09 1992-02-18 Westinghouse Electric Corp. Sludge removal system for removing sludge from heat exchangers

Also Published As

Publication number Publication date
DE69301624D1 (de) 1996-04-04
FR2690224A1 (fr) 1993-10-22
US5335631A (en) 1994-08-09
CN1033829C (zh) 1997-01-15
CN1079544A (zh) 1993-12-15
TW221486B (enrdf_load_stackoverflow) 1994-03-01
FR2690224B1 (fr) 1994-06-03
KR930022389A (ko) 1993-11-24
JPH06129601A (ja) 1994-05-13
EP0566477A1 (fr) 1993-10-20

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