EP0216667B1 - Rückhaltevorrichtung für eine Flüssigkeit um zu verhindern, dass eine offene, im wesentlichen horizontale Leitung beim Unterschreiten einer bestimmten Zuflussmenge leer läuft - Google Patents

Rückhaltevorrichtung für eine Flüssigkeit um zu verhindern, dass eine offene, im wesentlichen horizontale Leitung beim Unterschreiten einer bestimmten Zuflussmenge leer läuft Download PDF

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Publication number
EP0216667B1
EP0216667B1 EP86401838A EP86401838A EP0216667B1 EP 0216667 B1 EP0216667 B1 EP 0216667B1 EP 86401838 A EP86401838 A EP 86401838A EP 86401838 A EP86401838 A EP 86401838A EP 0216667 B1 EP0216667 B1 EP 0216667B1
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EP
European Patent Office
Prior art keywords
tubes
pipe
liquid
duct
tube
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
Application number
EP86401838A
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English (en)
French (fr)
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EP0216667A1 (de
Inventor
Jean-Claude Fenet
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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Commissariat a lEnergie Atomique CEA
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Publication of EP0216667A1 publication Critical patent/EP0216667A1/de
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Publication of EP0216667B1 publication Critical patent/EP0216667B1/de
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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

Definitions

  • the present invention relates to a device for retaining a liquid in a pipe of substantially horizontal axis and having an open outlet end, when the flow of this liquid is stopped or its flow drops below a threshold given.
  • the temperature of the feed water injected into the steam generator can be reduced and the flow rate can be reduced.
  • the previously mentioned stratification phenomenon is therefore likely to occur, causing severe thermal stresses on the connection pipe between the envelope of the generator and the feed water inlet pipe.
  • the subject of the invention is precisely a device making it possible to solve these problems by ensuring at low flow rate the retention of the liquid in an open pipe of substantially horizontal axis, without however disturbing too much the flow of the liquid in this pipe in normal operating conditions.
  • a device for retaining liquid in a substantially horizontal axis pipe having an outlet end opening into a gaseous medium when the flow rate of said liquid drops below a threshold comprising four tubes placed in the pipeline and wound helically around a central hub disposed along the axis of the pipeline, each of these tubes having at least one low point for which the tube is located entirely below the axis of the pipe and a high point for which the tube is located entirely above said axis and has an opening communicating with the outlet end of the pipe, the high point being closer to the outlet end than the low point, the tubes as well as the central hub being supported inside the pipe by a sealed support plate interposed between the pipe and the said tubes, at one end of the latter opposite to said outlet end of the pipe.
  • the tubes remain permanently filled with water on the side of their inlet end.
  • each of the tubes having an opening at its highest point, no siphon effect occurs. Therefore, the circulation of the liquid in each tube is determined only by the flow in the pipeline. When this flow is canceled out or becomes very low, stagnant liquid remains in each tube and somehow forms a plug opposing the flow of the liquid it contains. The desired effect is thus obtained.
  • the device is designed to disturb as little as possible the flow of the liquid under normal operating conditions, that is to say when the flow rate is high.
  • the use of four helically wound tubes makes it possible to reduce the passage section as little as possible.
  • the ends of the central hub are preferably tapered.
  • said opening is a hole formed in the highest part of the wall of the tube.
  • the other end of the tube is located at said high point and forms said opening.
  • FIG. 1 very schematically represents a steam generator ensuring the heat exchange between the primary water circuit and the secondary water-steam circuit in a pressurized water nuclear reactor.
  • the steam generator 10 represented in FIG. 1 is of the same type as that which is the subject of patent FR-A 2 428 787. It will therefore not be described in detail.
  • the generator 10 comprises a cylindrical casing 12, of vertical axis, in the lower part of which is disposed a bundle of inverted U-shaped tubes 14.
  • the ends of the tubes 14 are fixed on a horizontal tube plate 16 delimiting with the end hemispherical lower part of the casing 12 a primary water inlet chamber 18 and a primary water outlet chamber 20.
  • Tubing 22 and 24 opening respectively into the chambers 18 and 20 make it possible to connect these to the rest of the primary circuit.
  • the water 26 of the secondary circuit in which the tubes 14 of the bundle bathe, is introduced into the upper part of the casing 12 by a substantially horizontal pipe 28.
  • This pipe 28 opens into a feed toroid 30 having perforated holes along its lower generatrix.
  • This torus 30 is placed in the water vapor formed by the heating of the water 26 of the secondary circuit resulting from the circulation of the primary water inside the U-shaped tubes 14.
  • the water vapor thus formed is evacuated through the dome formed at the upper end of the casing 12, by an outlet pipe 32, after having passed through the drying devices 13.
  • the secondary circuit also comprises, in a known manner, a turbine 34 and a circulation pump 36.
  • the horizontal pipe 28 which opens through the torus 30 into the atmosphere of water vapor prevailing in the upper part of the casing 12 has the drawbacks mentioned above. Indeed, a significant stop or drop in the flow of water admitted by the horizontal pipe 28 inside the steam generator leads to penetration of the water vapor inside the torus 30 and the pipe horizontal 28.
  • a lower flow of cold water than previously can be sent to the steam generator. Given the density effects between cold and hot water, stratification then tends to take place and progress along the piping. This stratification then creates severe thermal stresses, in particular on the connection pipe between the casing 12 of the steam generator and the piping 28.
  • This device shown in more detail in FIGS. 2 and 3 comprises a central hub 40, of relatively small cylindrical section, arranged along the axis of the pipe 28. In order to reduce the resistance to the flow of the liquid (arrow F on Figure 2) presented by this central hub 40, its ends are tapered.
  • a second plate 46 preferably arranged with some play inside of the pipe 28.
  • this plate 46 is not waterproof.
  • the passage of the fluid on either side of this plate can be done by the annular space formed between the periphery thereof and the pipe 28 and / or by perforations passing through it.
  • the tubes 42 have an outside diameter of very little less than the difference between the inside diameter of the piping 28 and the outside diameter of the hub 40.
  • the passage section of the device 38 is therefore also as large as possible, which makes it possible to present the minimum flow resistance inside the piping 28.
  • each of the tubes 42a to 42d are all of the same length, this length being such that each of them extends over at least one pitch of the propeller that it forms around the hub 40.
  • each of the tubes 42 passes through at least one high point for which it is entirely above the axis of the pipe 28 and at least one low point for which it is entirely below of this axis, this low point being located upstream of the high point, if we consider the direction of flow of the liquid indicated by the arrow F.
  • the high point of the tube 42a placed downstream from its low point is coincident with the end of this tube fixed to the plate 46. It therefore communicates directly with the open outlet end of the line 28, so that any siphon effect is impossible.
  • the high points of the tubes 42b, 42c and 42d are followed downstream of a portion of downward tube, so that a siphon effect is likely to occur.
  • a hole 48b, 48c and 48d is formed in the highest part of the wall of each of these tubes, at the location of this high point.
  • the gaseous medium in this case, water vapor
  • the steam quickly reaches this device, at least in the upper part of the pipe. Due to the non-sealed nature of the plate 46, the steam enters the high point of each of the tubes through the holes 48b to 48d for the tubes 42b to 42d and through the open left end of the tube 48a. This introduction of vapor into the high point of each of the tubes has the effect of avoiding any phenomenon of siphoning of the liquid present upstream of the device 38 towards the open end of the pipe 28.
  • the variant embodiment shown in FIG. 4 essentially differs from the variant embodiment which has just been described with reference to FIGS. 2 and 3 in that the admission of gaseous fluid through the high points of each of the tubes 42 ' b at 42'd is no longer made by means of a hole but by using tubes of different lengths, the end closest to the open outlet end of the pipe 28 (i.e. the left end in Figure 4) is located at the location of this high point.
  • the left ends of each of the tubes 42'a to 42'd are thus regularly spaced between the plate 46 and the plate 44. Consequently, only the tube 42'a is fixed to the plate 46.
  • FIG. 4 The operation of the device shown in FIG. 4 is also completely identical to that of the device described above with reference to FIGS. 2 and 3.
  • FIG. 4 a variant has also been shown of the case where the device 38 is installed inside a pipe 28 in one piece, the periphery of the plate 44 then being welded directly inside this pipe. .
  • tubes of circular section described can be replaced by tubes of different section.
  • such a device can be used in all hydraulic circuits comprising a substantially horizontal pipe, one end of which opens into a gaseous fluid, to avoid water hammer or thermal problems in such a pipe.

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  • 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)
  • Safety Valves (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • External Artificial Organs (AREA)

Claims (5)

1. Vorrichtung zum Zurückhalten einer Flüssigkeit in einer eine im wesentlichen waagerechte Achse sowie ein in einem gasförmigen Medium ausmündendes Austrittsende aufweisenden Leitung (28) bei Unterschreitung einer vorgegebenen Durchflußmenge, dadurch gekennzeichnet, daß die Vorrichtung (38) vier in der Leitung (28) angeordnete und entlang Schraubenlinien um einen in der Achse der Leitung (28) angeordneten Mittelkern (40) gewickelte Rohre (42a bis 42d) aufweist, welche jeweils einen tiefsten Punkt, an welchem das jeweilige Rohr insgesamt unterhalb der Achse der Leitung liegt, und einen höchsten Punkt aufweisen, an welchem das jeweilige Rohr insgesamt oberhalb der Achse der Leitung liegt und eine mit dem Austrittsende der Leitung in Strömungsverbindung stehende Öffnung (48b bis 48d) aufweist, wobei der höchste Punkt jeweils näher am Austrittsende liegt als der niedrigste Punkt und die Rohre (42a bis 42d) sowie der Mittelkern (40) im Inneren der Leitung
(28) durch eine Tragplatte (44) gehalten sind, welche an einem dem Austrittsende der Leitung gegenüberliegenden Ende der Rohre (42a bis 42d) abdichtend zwischen diesen und der Leitung (28) angeordnet ist.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Enden des Mittelkerns (40) stromlinienförmig sind.
3. Vorrichtung nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, daß die genannte Öffnung ein im höchstgelegenen Teil der Wandung des Rohrs (42b bis 42d) ausgebildetes Loch (48b bis 48d) ist.
4. Vorrichtung nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß das andere Ende des Rohrs (42a; 42'a bis 42'd) an dem genannten höchsten Punkt angeordnet ist und die genannte Öffnung bildet.
EP86401838A 1985-08-23 1986-08-19 Rückhaltevorrichtung für eine Flüssigkeit um zu verhindern, dass eine offene, im wesentlichen horizontale Leitung beim Unterschreiten einer bestimmten Zuflussmenge leer läuft Expired EP0216667B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8512667A FR2586465B1 (fr) 1985-08-23 1985-08-23 Dispositif de retenue de liquide dans une canalisation sensiblement horizontale presentant une extremite ouverte, lorsque le debit du liquide descend en dessous d'un seuil donne
FR8512667 1985-08-23

Publications (2)

Publication Number Publication Date
EP0216667A1 EP0216667A1 (de) 1987-04-01
EP0216667B1 true EP0216667B1 (de) 1989-02-22

Family

ID=9322361

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86401838A Expired EP0216667B1 (de) 1985-08-23 1986-08-19 Rückhaltevorrichtung für eine Flüssigkeit um zu verhindern, dass eine offene, im wesentlichen horizontale Leitung beim Unterschreiten einer bestimmten Zuflussmenge leer läuft

Country Status (5)

Country Link
US (1) US4773449A (de)
EP (1) EP0216667B1 (de)
JP (1) JPS6249101A (de)
DE (1) DE3662162D1 (de)
FR (1) FR2586465B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2617570B1 (fr) * 1987-06-30 1989-12-01 Framatome Sa Dispositif anti-stratification thermique pour tuyau d'alimentation de generateur de vapeur

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE123537C (de) *
US1672617A (en) * 1922-08-12 1928-06-05 Lasker George Boiler
US1887130A (en) * 1926-10-20 1932-11-08 James C Hobbs Tube for furnaces
GB381889A (en) * 1932-05-11 1932-10-13 John Lloyd Gibson Improved device for circulating the water in boiler water tubes
FR828942A (fr) * 1936-11-18 1938-06-03 Hungaria Kunstdu Nger Procédé de traitement de résidus de pyrites grillées
BE828942A (fr) * 1975-05-12 1975-09-01 Conduite d'alimentation en eau d'un generateur de vapeur

Also Published As

Publication number Publication date
DE3662162D1 (en) 1989-03-30
JPS6249101A (ja) 1987-03-03
FR2586465B1 (fr) 1988-05-13
EP0216667A1 (de) 1987-04-01
US4773449A (en) 1988-09-27
FR2586465A1 (fr) 1987-02-27

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