EP0441697A1 - Dampferzeuger mit Verteiler, insbesondere für Atomkraftwerk - Google Patents

Dampferzeuger mit Verteiler, insbesondere für Atomkraftwerk Download PDF

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Publication number
EP0441697A1
EP0441697A1 EP91400270A EP91400270A EP0441697A1 EP 0441697 A1 EP0441697 A1 EP 0441697A1 EP 91400270 A EP91400270 A EP 91400270A EP 91400270 A EP91400270 A EP 91400270A EP 0441697 A1 EP0441697 A1 EP 0441697A1
Authority
EP
European Patent Office
Prior art keywords
pipes
steam generator
distributor
enclosure
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.)
Ceased
Application number
EP91400270A
Other languages
English (en)
French (fr)
Inventor
Patrick Sundheimer
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 EP0441697A1 publication Critical patent/EP0441697A1/de
Ceased 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
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • 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
    • F22B37/22—Drums; Headers; Accessories therefor
    • F22B37/228—Headers for distributing feedwater into steam generator vessels; Accessories therefor

Definitions

  • the invention relates to steam generators of the type comprising a pressure-resistance enclosure containing a bundle of exchange tubes and the upper part of which constitutes a steam balloon, enclosure in which a distributor is placed which is at least approximately toroidal in shape , connected to a supply line for drinking water passing through the wall of the enclosure and provided with distribution means intended for discharging the drinking water into the enclosure, constituted by nozzles in the butt connected to the upper generator of the distributor .
  • the invention finds a particularly important application in nuclear power plants which include a steam generator whose bundle of exchange tubes is traversed by the primary fluid of the reactor.
  • Document FR-A-2 333 200 (Westinghouse Electric Corporation) describes a generator in which, among the outlet pipes in the form of a butt or an inverted J which allow the dispenser to remain filled with drinking water, one at less, close to the water supply pipe, is shorter than the others and prevents steam from being trapped in the distributor.
  • the beam exchange tubes being in vertical hairpin shape with a "hot" inlet branch and a "cold” outlet branch, the tubes are distributed with a smaller interval on the portion of the distributor which surmounts the hot branch than on the portion of the distributor which overcomes the cold branch.
  • the great asymmetry of distribution of the openings makes this arrangement unfavorable to the resistance to fatigue of the toric distributor. Manufacturing is further complicated by the very close arrangement of the pipes above the hot branch.
  • the invention aims to provide a steam generator of the type defined above, whose exchange tubes have a cold branch and a hot branch which must be subjected to a more intense cooling than the other, responding better than those previously known to the requirements of the practice, in particular in that it does not have an asymmetry of distribution of the pipes and consequently has a better resistance to fatigue and a simpler manufacture.
  • the invention proposes in particular a generator characterized in that the stick pipes are distributed at equal angular intervals and have, at least locally, a different internal section according to their location on the distributor.
  • the pipes will generally have one or the other of two internal diameters, at the less over a fraction of their length, the tubes placed above the hot branches having the largest diameter, while the tubes placed above the cold branches have a smaller diameter.
  • the ratio of the flow rates to be supplied over the hot and cold branches is approximately 80/20, the ratio between the diameters can be 2/1.
  • the tubes are generally oriented radially, in alternating directions. This arrangement makes it possible to give the approximately toroidal distributor a smaller overall diameter than when the pipes are all directed inwards.
  • the possible reduction in diameter can be further increased by directing the outlet of the tubes in the butt stock not vertically, but obliquely, with a slope relative to the vertical generally between 5 ° and 30 °.
  • the steam generator shown in Figure 1 has a well-known general constitution, currently used in nuclear power plants with a pressurized water reactor. This general constitution appears for example in the document FR-A-2 333 200 already mentioned.
  • the exchanger comprises an enclosure 10 of resistance to pressure, containing a bundle of exchange tubes 12 in hairpin and the upper part of which constitutes a steam balloon fitted with a steam outlet pipe 14.
  • a distributor 16 of generally toric shape, which may or may not have lobes.
  • a pipe 18 for supplying edible water to the distributor 16 has a straight and horizontal part fixed to a sleeve (not shown) for crossing the enclosure 10. It is extended by a section 20 of connection with the distributor 16, forming a connection tee.
  • Line 18 is provided with a main supply which receives water, preheated or not, and an emergency water supply line, closed during normal operation (not shown).
  • connection tee 20 is fixed, for example by welding, on the one hand, to the supply pipe 18, on the other hand, at the ends of the distributor 16.
  • the supply pipe 18 or the portion of the tee placed in upstream of the arms for connection with the distributor 16 advantageously contains a deflector with helical blades of the kind described in document EP-A-0 210 895, which avoids or at least reduces the risk of water hammer.
  • Two butted tubes are advantageously provided on the connection tee 20. They have an inverted J shape whose jamb opens in the connection tee, at the level of the upper generator of the latter.
  • the two crooked tubes 22 are identical, but directed in opposite directions transversely to the median plane of the distributor 16, with a longitudinal offset.
  • These tubes can, conventionally, have a semicircle loop, as shown in Figure 3. But, as shown in Figure 3A, the loop of the J may not be complete, so that the direction of exit of the drinking water has a slope on the vertical which will then generally be between 5 and 30 ° and in particular allows the water streams to be directed in a direction such that they do not strike the wall of the connection tee 20.
  • the butt tubes 22 are placed downstream of the deflector, when a deflector is provided.
  • the distributor 16 is, in the embodiment shown, in the form of a ring of constant section, having a symmetry of revolution around an axis coincident with that of the enclosure 10.
  • the horizontal median plane of the distributor 16 is at the same level as that of the supply pipe 18 but its diameter is smaller, given that the flow rate supplied by the pipe is distributed between the two outputs of the connection tee 20.
  • the butt pipes are distributed at equal angular intervals on the distributor. These pipes, sixteen in number in the illustrated embodiment, all have an inverted J shape and are directed radially. But they have alternate meanings. Because of the protection provided by the deflector (or deflectors) placed in the connection tee 20 or in the pipe 18, it will often be possible to give the distributor the exactly toric shape shown in FIG. 2.
  • the pipes 24 placed above above the cold branches of the exchange tubes have an internal diameter d less than the internal diameter D of the pipes 26 which open above the hot branches. Often, a diameter D approximately equal to 2d will give good results. Often also, it will be possible to adopt for the internal diameter d0 tubing 22 a value equal to that of d .
  • the pipes 24 and 26 can have either a semicircular stock, or - as shown in Figures 4 and 5 - an incomplete stock, in the sense that the outlet is oriented so that the threads water coming out of the pipes have an inclination a on the vertical of between 5 ° and 30 °.
  • This arrangement makes it possible, due to the divergence of the flow from the distributor-tubing assembly, to give the distributor a diameter much smaller than that of the enclosure 10.
  • the tubing 22 replaces the tubing distributed circumferentially, on the connection tee 20.
  • the difference in cross-section between tubing may affect only part of the length of the tubing; all the tubes then have the same internal diameter, locally reduced by a diaphragm.
  • an end section of section adjustment is reported.
  • the end section 28 of FIG. 6 constitutes a ring with cylindrical external surface and converging internal surface fixed, for example by welding or brazing, on the end face of the tubing.
  • the end section of Figure 7 differs from the previous in that it comprises an annular lip 30 for welding to a similar lip provided on the tube.

Landscapes

  • 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)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)
EP91400270A 1990-02-08 1991-02-05 Dampferzeuger mit Verteiler, insbesondere für Atomkraftwerk Ceased EP0441697A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9001472A FR2657948B1 (fr) 1990-02-08 1990-02-08 Generateur de vapeur a distributeur, en particulier pour centrale nucleaire.
FR9001472 1990-02-08

Publications (1)

Publication Number Publication Date
EP0441697A1 true EP0441697A1 (de) 1991-08-14

Family

ID=9393502

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91400270A Ceased EP0441697A1 (de) 1990-02-08 1991-02-05 Dampferzeuger mit Verteiler, insbesondere für Atomkraftwerk

Country Status (8)

Country Link
US (1) US5083529A (de)
EP (1) EP0441697A1 (de)
JP (1) JPH05157202A (de)
KR (1) KR910015816A (de)
CN (1) CN1063927A (de)
CA (1) CA2035766A1 (de)
FR (1) FR2657948B1 (de)
ZA (1) ZA91915B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0640792A2 (de) * 1993-08-02 1995-03-01 Westinghouse Electric Corporation Sekundärfluidzufuhrsystem für einem Dampferzeuger

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5350011A (en) * 1993-08-02 1994-09-27 Westinghouse Electric Corporation Device and method for thermally insulating a structure to prevent thermal shock therein
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
FR2853047B1 (fr) * 2003-03-31 2005-06-24 Framatome Anp Generateur de vapeur comportant un dispositif d'alimentation en eau de secours
JP2012220077A (ja) * 2011-04-07 2012-11-12 Mitsubishi Heavy Ind Ltd 蒸気発生器用給水管

Citations (3)

* 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
EP0035450A1 (de) * 1980-02-29 1981-09-09 Framatome Dampferzeuger mit Vorwärmung
EP0161894A2 (de) * 1984-05-14 1985-11-21 Westinghouse Electric Corporation Abzugsrohr zum Verhindern von Stratifikation in Speisewassersammlern und Dampferzeugern

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991720A (en) * 1975-01-29 1976-11-16 Westinghouse Electric Corporation J tube discharge or feedwater header
SE465591B (sv) * 1987-05-22 1991-09-30 Asea Atom Ab Aanggenerator med u-formade tubknippen att anvaendas i en tryckvattenreaktor

Patent Citations (3)

* 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
EP0035450A1 (de) * 1980-02-29 1981-09-09 Framatome Dampferzeuger mit Vorwärmung
EP0161894A2 (de) * 1984-05-14 1985-11-21 Westinghouse Electric Corporation Abzugsrohr zum Verhindern von Stratifikation in Speisewassersammlern und Dampferzeugern

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0640792A2 (de) * 1993-08-02 1995-03-01 Westinghouse Electric Corporation Sekundärfluidzufuhrsystem für einem Dampferzeuger
EP0640792A3 (de) * 1993-08-02 1995-06-28 Westinghouse Electric Corp Sekundärfluidzufuhrsystem für einem Dampferzeuger.

Also Published As

Publication number Publication date
CA2035766A1 (en) 1991-08-09
FR2657948B1 (fr) 1992-05-29
FR2657948A1 (fr) 1991-08-09
US5083529A (en) 1992-01-28
JPH05157202A (ja) 1993-06-22
ZA91915B (en) 1991-12-24
KR910015816A (ko) 1991-09-30
CN1063927A (zh) 1992-08-26

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