EP0297968A1 - Dampferzeuger mit einem Speisewasserrohr mit einer Einrichtung zum Verhindern von thermischer Stratifikation - Google Patents

Dampferzeuger mit einem Speisewasserrohr mit einer Einrichtung zum Verhindern von thermischer Stratifikation Download PDF

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Publication number
EP0297968A1
EP0297968A1 EP88401636A EP88401636A EP0297968A1 EP 0297968 A1 EP0297968 A1 EP 0297968A1 EP 88401636 A EP88401636 A EP 88401636A EP 88401636 A EP88401636 A EP 88401636A EP 0297968 A1 EP0297968 A1 EP 0297968A1
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EP
European Patent Office
Prior art keywords
supply pipe
steam generator
stratification
thermal
hub
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.)
Granted
Application number
EP88401636A
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English (en)
French (fr)
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EP0297968B1 (de
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
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Filing date
Publication date
Application filed by Framatome SA filed Critical Framatome SA
Publication of EP0297968A1 publication Critical patent/EP0297968A1/de
Application granted granted Critical
Publication of EP0297968B1 publication Critical patent/EP0297968B1/de
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
    • F22B37/22—Drums; Headers; Accessories therefor
    • F22B37/228—Headers for distributing feedwater into steam generator vessels; Accessories therefor
    • 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
    • F22B37/10—Water tubes; Accessories therefor
    • F22B37/18—Inserts, e.g. for receiving deposits from water

Definitions

  • the present invention relates to a thermal anti-stratification device for supply pipes to steam generators, and more particularly to pressurized water steam generators used in nuclear power plants.
  • the steam generators of such power stations frequently include a ring-shaped distributor, the shape of which resembles a torus with a vertical axis or with lobes, supplied by a substantially horizontal pipe.
  • a ring-shaped distributor the shape of which resembles a torus with a vertical axis or with lobes, supplied by a substantially horizontal pipe.
  • This stratification maintains a high temperature gradient between the lower part and the upper wall of the pipe, which generates thermal stresses such as to cause cracking, including in the weld connecting the pipe to the enclosure. This phenomenon is further aggravated by the fatigue induced by the oscillations of the interface between the layers.
  • the bent pipes supposed to favor the accumulation of cold water in an upstream part at a lower altitude where the areas to be protected do not appreciably reduce this phenomenon of stratification, which seems to indicate that it is maintained in particular by the heat exchange due to natural convection between the hot water occupying the tank and the inside of the pipe.
  • Various attempts have been made to eliminate this stratification.
  • One is to introduce drinking water into the pipe through an annular weir opening into a water box where some mixing occurs.
  • Such a device has only a very low efficiency: in fact, when the flow is low, that is to say when looking for a mixture, the trickle of cold supply water is content to bypass the obstacle thus constituted.
  • the invention aims to provide means for eliminating this problem of stratification in the supply pipes of steam generators, and this by using only simple means, imposing only a small pressure drop on the 'flow, and purely static.
  • the invention relates, housed downstream of an ascending step of the supply pipe itself downstream of an area of the supply pipe where thermal stratification is to be avoided, a fixed propeller constituted by '' a central hub and blades joining the hub to the feed pipe, the blades making at least a half-turn around the hub and delimiting twisted channels arranged so that the feed water does not flow downstream of the propeller, flowing by gravity in the channels, only after having completely filled the supply pipe upstream of the setback.
  • the step advantageously consists of two horizontal parts of the supply pipe connected by a middle portion, oblique of about thirty degrees, of said supply pipe.
  • FIG. 1 a conventional water supply pipe 1 penetrating through the envelope 2 of the steam generator, to which it is joined by the welds 9, into the interior 3 thereof to lead into a feed toroid not shown.
  • the supply pipe 1 can be connected to two separate supplies.
  • a hot water supply 4 is used in normal service, and the flow is then large enough to completely fill the supply pipe 1.
  • a second cold water supply 5 is used to cool the interior 3 of the steam generator, it is generally with a low flow rate, so that the cold water circulates according to arrow F in the form of a layer 6 in a lower part of the supply pipe 1 while being surmounted by a residual layer of hot water 7, of lower density, which is maintained in the supply pipe 1.
  • the two layers 6 and 7 do not mix and no equalization of their temperatures is observed, due to a permanent renewal of hot water in the supply pipe 1: the circulation of hot water s '' according to arrows C1, upstream thereof by the top of the residual layer 7 before being driven downstream, according to arrows C2, under the action of the flow of layer 6 of cold water.
  • the supply pipe according to the invention is made up of three parts: an upstream part 11 passing through the envelope 2, a downstream part inside the envelope 2 which leads to the feed toroid and a median section 12 connecting the two previous parts.
  • the upstream 11 and downstream 13 parts are horizontal, the downstream part being situated at a somewhat higher altitude, so that they constitute an ascending vertical step and the median section 12 is oblique and makes an angle A with respect to the horizontal, angle chosen essentially not to create an excessive pressure drop and which can be around thirty degrees.
  • a fixed propeller 14 is housed in the downstream part 13. It consists of a long cylindrical hub 15 with an axis parallel to that of the downstream part 13 and blades 16, here four in number as best seen in FIG. 3, joining the hub 15 to the pipe of the downstream part 13.
  • the blades 16 extend over the length of the hub 15 and are twisted so as to travel three quarters of a turn in the pipe. They can be plausibly identical and angularly distributed at equal intervals.
  • Two neighboring blades 16, the hub 15 and the pipe of the downstream part 13 delimit channels 17 whose section is an angular sector of the crown; the channels 17 are twisted due to the twisted shape of the blades 16.
  • the end 18 of the blades 16 closest to the middle section 12 is oriented at forty-five degrees from the horizontal: we can therefore distinguish in FIG. 3 an upper channel 17s at above the hub 15 at this location, a lower channel 17f which is opposite to it with respect to the hub 15, and two lateral channels left and right 17g and 17d likewise opposite.
  • the water circulating downstream that is to say to the right in FIG. 2, passes through the propeller 14 and inside the channels 17.
  • each channel 17 has a section above the hub 15: the upper channel 17s at the inlet of the propeller 14, the right lateral channel 17d at one third of its length, the lower channel 17f two-thirds and the left lateral channel 17g at the outlet (abscissa l / 3, 2l / 3 and l respectively).
  • the entire protective device operates in the manner which we will now describe.
  • the propeller simultaneously blocks the convection currents of hot water upstream.
  • a correct implementation of the invention therefore depends on the compatibility of the propeller 14 and the recess created using the middle section 12.
  • each channel 17 delimited by the blades 16 of the propeller 14 must have a section which or entirely above the upstream part 11 of the supply pipe to be protected.
  • At least one hole 30 is formed in the upper part of a blade 16, thus enabling the assembly of all the channels.
  • the propeller 14 can first of all be welded to the downstream part 13 by a spacer 21 at the end of the hub 15, after which the clearance between the blades 16 and the downstream part is filled 13 by welding or brazing for example.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Pipeline Systems (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)
EP88401636A 1987-06-30 1988-06-27 Dampferzeuger mit einem Speisewasserrohr mit einer Einrichtung zum Verhindern von thermischer Stratifikation Expired - Lifetime EP0297968B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8709219A FR2617570B1 (fr) 1987-06-30 1987-06-30 Dispositif anti-stratification thermique pour tuyau d'alimentation de generateur de vapeur
FR8709219 1987-06-30

Publications (2)

Publication Number Publication Date
EP0297968A1 true EP0297968A1 (de) 1989-01-04
EP0297968B1 EP0297968B1 (de) 1992-01-02

Family

ID=9352681

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88401636A Expired - Lifetime EP0297968B1 (de) 1987-06-30 1988-06-27 Dampferzeuger mit einem Speisewasserrohr mit einer Einrichtung zum Verhindern von thermischer Stratifikation

Country Status (8)

Country Link
US (1) US4870927A (de)
EP (1) EP0297968B1 (de)
JP (1) JPS6423003A (de)
KR (1) KR0139646B1 (de)
CN (1) CN1007450B (de)
DE (2) DE297968T1 (de)
ES (1) ES2005536T3 (de)
FR (1) FR2617570B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993020386A1 (en) * 1992-04-03 1993-10-14 Vítkovice A.S. Feed system of a heat exchanger

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5365891A (en) * 1993-12-16 1994-11-22 Rheem Manufacturing Company Inlet water turbulator for a water heater
US5943984A (en) * 1997-05-29 1999-08-31 Bradford White Corporation Side inlet for a water heater
US5988117A (en) * 1997-05-29 1999-11-23 Bradford White Corp Top inlet for a water heater
US6935280B1 (en) 2004-09-17 2005-08-30 Bradford White Corporation Cold water inlet for reducing accumulation of scale
US7634976B2 (en) * 2006-03-30 2009-12-22 Bradford White Corporation Apparatus and method for delivering water into a water heater
US20070227468A1 (en) * 2006-03-30 2007-10-04 Bradford White Corporation Apparatus and method for introducing and drawing water in a water heater
US10730630B2 (en) * 2016-01-14 2020-08-04 Hamilton Sundstrand Corporation Low pressure pack
CN113340000B (zh) * 2021-06-28 2022-06-14 栾东存 一种可减少积碳的有机热载体锅炉导热油管
CN114278574A (zh) * 2021-12-27 2022-04-05 上海艺迈实业有限公司 一种高效节能循环泵
CN114198586B (zh) * 2021-12-27 2023-11-28 大唐长春热力有限责任公司 一种用于供热管道的电池系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0045034A1 (de) * 1980-07-21 1982-02-03 Kraftwerk Union Aktiengesellschaft Einrichtung zur Vermeidung von Rissbildungen an den Innenflächen von in Druckbehälter mündenden Speisewasserleitungsstutzen
GB2157407A (en) * 1984-04-09 1985-10-23 Westinghouse Electric Corp Open channel steam generator feedwater system
EP0210895A1 (de) * 1985-07-02 1987-02-04 Framatome Dampferzeuger mit Verteiler, insbesondere für Atomkraftwerk
EP0216667A1 (de) * 1985-08-23 1987-04-01 Commissariat A L'energie Atomique Rückhaltevorrichtung für eine Flüssigkeit um zu verhindern, dass eine offene, im wesentlichen horizontale Leitung beim Unterschreiten einer bestimmten Zuflussmenge leer läuft

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0045034A1 (de) * 1980-07-21 1982-02-03 Kraftwerk Union Aktiengesellschaft Einrichtung zur Vermeidung von Rissbildungen an den Innenflächen von in Druckbehälter mündenden Speisewasserleitungsstutzen
GB2157407A (en) * 1984-04-09 1985-10-23 Westinghouse Electric Corp Open channel steam generator feedwater system
EP0210895A1 (de) * 1985-07-02 1987-02-04 Framatome Dampferzeuger mit Verteiler, insbesondere für Atomkraftwerk
EP0216667A1 (de) * 1985-08-23 1987-04-01 Commissariat A L'energie Atomique Rückhaltevorrichtung für eine Flüssigkeit um zu verhindern, dass eine offene, im wesentlichen horizontale Leitung beim Unterschreiten einer bestimmten Zuflussmenge leer läuft

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993020386A1 (en) * 1992-04-03 1993-10-14 Vítkovice A.S. Feed system of a heat exchanger

Also Published As

Publication number Publication date
CN88104070A (zh) 1988-12-21
FR2617570A1 (fr) 1989-01-06
CN1007450B (zh) 1990-04-04
DE3867337D1 (de) 1992-02-13
ES2005536A4 (es) 1989-03-16
DE297968T1 (de) 1989-04-20
ES2005536T3 (es) 1992-07-01
KR890000827A (ko) 1989-03-16
FR2617570B1 (fr) 1989-12-01
KR0139646B1 (ko) 1998-07-01
EP0297968B1 (de) 1992-01-02
JPS6423003A (en) 1989-01-25
US4870927A (en) 1989-10-03

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