EP0165846A1 - Flüssigkeitsinjektionseinrichtung in einem Rohr und Dampferzeuger mit solcher Einrichtung - Google Patents

Flüssigkeitsinjektionseinrichtung in einem Rohr und Dampferzeuger mit solcher Einrichtung Download PDF

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Publication number
EP0165846A1
EP0165846A1 EP85401000A EP85401000A EP0165846A1 EP 0165846 A1 EP0165846 A1 EP 0165846A1 EP 85401000 A EP85401000 A EP 85401000A EP 85401000 A EP85401000 A EP 85401000A EP 0165846 A1 EP0165846 A1 EP 0165846A1
Authority
EP
European Patent Office
Prior art keywords
cannula
tube
fluid
sheath
inlet
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
EP85401000A
Other languages
English (en)
French (fr)
Other versions
EP0165846B1 (de
Inventor
Jean Edmond Chaix
Michel Metteey
Jean-Paul Badoux
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
Original Assignee
Commissariat a lEnergie Atomique CEA
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 Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP0165846A1 publication Critical patent/EP0165846A1/de
Application granted granted Critical
Publication of EP0165846B1 publication Critical patent/EP0165846B1/de
Expired 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
    • F22B21/00—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
    • F22B21/22—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from water tubes of form other than straight or substantially straight
    • F22B21/26—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from water tubes of form other than straight or substantially straight bent helically, i.e. coiled
    • 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
    • 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
    • F22B37/62—Component parts or details of steam boilers specially adapted for steam boilers of forced-flow type
    • F22B37/70—Arrangements for distributing water into water tubes
    • F22B37/72—Arrangements for distributing water into water tubes involving injection devices

Definitions

  • the present invention relates to a device for injecting a Liquid into a tube comprising a cannula disposed in said tube, this cannula comprising, in the direction of injection of the fluid, a passage of narrowed section followed by a divergent. It is particularly applicable to the injection of water into a steam generator, in particular of the single pass type with vertical penetration.
  • Single-pass helical steam generators have a pressure-resistant jacket containing coiled tubes.
  • a first heat transfer fluid called the primary fluid circulates outside these tubes.
  • a secondary fluid flows through the network of tubes. It penetrates through the cover of the envelope into the tubes by thermal sleeves which pass through a tube plate, then descends by bundles of straight tubes placed in the central zone of the steam generator to the base of the tubes wound by When it rises and leaves in the form of vapor through sleeves which pass through the cover at its periphery.
  • the flow rate of the secondary fluid can be the seat of instabilities which appear particularly in low power conditions and which seriously disturb the operation of the device.
  • the invention relates to a device for injecting a fluid into a tube which overcomes these drawbacks.
  • This device is characterized in that it comprises a cannula disposed in said tube, said canute comprising, in the direction of injection of the fluid, a passage of reduced section followed by a divergent.
  • the cross section of the fluid in the cannula is determined in such a way that the speed of this fluid is greater than 0.7 m / s.
  • the invention relates to a steam generator.
  • This generator comprises an envelope, a tube plate, situated inside the envelope and dividing the envelope into a water box and a heat exchange zone, an inlet and an outlet for a primary fluid, located in the heat exchange zone of the envelope, an inlet and an outlet for a secondary fluid, located in the water box, a plurality of tubes having an inlet end and an outlet end for the secondary fluid, said inlet and outlet ends being fixed to the tube plate, each tube comprising a rectilinear part on the side of its inlet end, a device for injecting the secondary fluid into a tube comprising a tube, called a cannula, disposed at The interior of the inlet end of a tube and having a passage section for the secondary fluid.
  • Said passage section of the cannula is followed, in the direction of circulation of the secondary fluid, by a divergent, a sheath being disposed between said cannula and the straight part of the tube, means being provided for centering the cannula relative to this straight part of the tube.
  • FIG 1 is a sectional perspective view of a steam generator of the single pass type with vertical penetration equipped with an injection device produced in accordance with the present invention; this generator, designated by the general reference 2, comprises a pressure-resistant envelope 4, of generally elongated cylindrical shape and of vertical axis.
  • the envelope 4 has a curved bottom 11. It is closed at its upper part by a cover 6. Between the cover and the envelope is a thick plate 8 called tube plate.
  • the cover 6 has a domed shape which delimits a volume 7 called "water box".
  • the water box 7 is divided into two zones by the ferrule 16, a circular central zone for the entry of water and an annular zone for the exit of steam. Line 18 drains steam.
  • Each tube has a straight part 10a arranged vertically and fixed to the tube plate.
  • the straight part 10a ends in a bend which connects it to a spiral part 10b connected to the peripheral zone of the tube plate 8.
  • An inlet 4a and an outlet 4b are arranged in the casing 4 to allow the circulation of a primary fluid.
  • a secondary fluid circulates inside the network of tubes 10. The secondary fluid, for example water, penetrates in the direction indicated by the arrow 14 then into the water box 7 in the right part 10a of the tubes 10.
  • the flow rate of the secondary fluid can be the seat of instabilities in low power regime.
  • the Applicant has been able to establish that during its fall in the straight tubes, the water heats up and has time to reach its saturation temperature. Consequently, vapor bubbles form which tend to rise. The current is too weak to entrain them. These bubbles accumulate at the entrance to the steam generator in the central area of the water box 7 and form a vapor blanket there, which abruptly condenses on contact with the cold water which enters the steam generator. . This brutal condensation produces a depression which causes a reversal of the flow by sucking upwards the water which has just been injected. This transient phenomenon is followed by a return to normal conditions and the sequence begins periodically.
  • the invention relates to a device for injecting a fluid into a tube which eliminates this phenomenon. This result is obtained by increasing the injection speed so that the water does not have time to reach its saturation temperature during its passage through the straight tubes 10a. Tests have shown that for a steam generator such as that shown in FIG. 1, the injection speed must be greater than 0.7 m / s.
  • FIG. 2 a sectional view of a preferred embodiment of an injection device of the invention.
  • Reference 8 designates the tube plate and Reference 10 has a tube fixed in this tube plate.
  • the tube 10a is surmounted by a head piece 228. This piece is fixed to the tube by forced fitting or by welding.
  • the injection device comprises a cannula 220 constituted by a tube comprising a central duct 238 of reduced section and the diameter of which has been determined so that the speed of the secondary fluid is always greater than 0.7 m / sec.
  • the cannula 220 has a divergent 222 making it possible to increase the passage section offered to the fluid and consequently to reduce its speed to a low value, so as not to produce erosion in the bend of the tube located immediately downstream of La cannule.
  • the insert by welding, in LaqueLLe is produced
  • the divergent 222 externally comprises a conical part 250 intended for centering and immobilizing the cannula relative to the tube 10a.
  • the cannula has a threaded part 260.
  • a clamping ring 262 is screwed onto the threaded part 260.
  • the ring 262 is immobilized by a lock nut 264 stopped in rotation in a known manner.
  • the cannula 220 is surrounded by a sheath 220 'which has an outer shoulder 221'.
  • the part on LaqueLLe is made the shoulder 221 'is attached by welding to the main part of the sheath.
  • the sheath At its lower part, the sheath has a cylindrical centering part 226 ′ whose external diameter is close to the internal diameter of the tube 10a.
  • the sheath also has a female cone 250 'adapted to cooperate with the male cone 250 of the cannula. Longitudinal slots 224 'are made to give elasticity and allow the expansion of the conical part 250'.
  • the head piece 228 has an internal shoulder intended to support the shoulder 221 ′ of the sheath.
  • a plug 230 is screwed into an internal threaded part of the head piece. This cap tightens the shoulder 221 'on the head piece.
  • the plug has a housing for a helical spring 266 which surrounds the cannula 220 and which is located between the plug 230 and the clamping ring 262.
  • the spring 266 has the function of ensuring the tightening and expansion of the part. conical 250 'of the sheath.
  • This embodiment has the advantage of making it possible to compensate for the differential expansions between the cannula and the sheath at the time of cold water injection.
  • the relative displacement of the cannula relative to the sheath is done freely at the level of the head pieces and not under friction stress in the tube 10a.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • External Artificial Organs (AREA)
  • Detergent Compositions (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
EP85401000A 1984-05-29 1985-05-21 Flüssigkeitsinjektionseinrichtung in einem Rohr und Dampferzeuger mit solcher Einrichtung Expired EP0165846B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8408414 1984-05-29
FR8408414A FR2565322B1 (fr) 1984-05-29 1984-05-29 Dispositif d'injection d'un liquide dans un tube et generateur de vapeur comportant ce dispositif

Publications (2)

Publication Number Publication Date
EP0165846A1 true EP0165846A1 (de) 1985-12-27
EP0165846B1 EP0165846B1 (de) 1988-09-28

Family

ID=9304496

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85401000A Expired EP0165846B1 (de) 1984-05-29 1985-05-21 Flüssigkeitsinjektionseinrichtung in einem Rohr und Dampferzeuger mit solcher Einrichtung

Country Status (5)

Country Link
US (1) US4721067A (de)
EP (1) EP0165846B1 (de)
JP (1) JPS60256702A (de)
DE (1) DE3565310D1 (de)
FR (1) FR2565322B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2694071B1 (fr) * 1992-07-22 1994-10-14 Framatome Sa Procédé et dispositif de réglage d'un débit d'eau d'alimentation dans un tube d'un générateur de vapeur.
WO2012034050A2 (en) * 2010-09-09 2012-03-15 Certek Heat Machine Usa, Llc Dugout heating system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE554160C (de) * 1932-07-02 L & C Steinmueller Wasserrohrkessel
DE1811596A1 (de) * 1968-01-15 1969-08-07 Waagner Biro Ag Verfahren und Einrichtung zur Vergleichmaessigung des Waermeueberganges
GB1439413A (en) * 1972-10-16 1976-06-16 Mitsui Shipbuilding Eng Boilers
US4191246A (en) * 1979-03-05 1980-03-04 Combustion Engineering, Inc. Device to reduce local heat flux through a heat exchanger tube
DE2927977A1 (de) * 1979-06-20 1981-01-22 Bbc Brown Boveri & Cie Waermeaustauscher

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3357409A (en) * 1964-10-07 1967-12-12 Atomic Energy Authority Uk Vertical tube module once-through steam generator
US3596638A (en) * 1968-10-15 1971-08-03 Siemens Ag Forced-flow steam generator to be heated by pressurized coolant of a nuclear reactor
US3707186A (en) * 1971-01-18 1972-12-26 Foster Wheeler Corp Cooling tube ferrule
US3992172A (en) * 1975-03-06 1976-11-16 Foster Wheeler Energy Corporation Separator arrangement for start-up system
US4285396A (en) * 1979-01-25 1981-08-25 Wachter Associates, Inc. Steam generator tube support system
DE3027510A1 (de) * 1980-07-19 1982-02-18 Hochtemperatur Reaktorbau Gmbh Gewoelbter deckel zum verschliessen einer vertikalen ausnehmung in einem druckgefaess
US4579087A (en) * 1983-12-21 1986-04-01 Westinghouse Electric Corp. Corrosion resistant steam generator and method of making same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE554160C (de) * 1932-07-02 L & C Steinmueller Wasserrohrkessel
DE1811596A1 (de) * 1968-01-15 1969-08-07 Waagner Biro Ag Verfahren und Einrichtung zur Vergleichmaessigung des Waermeueberganges
GB1439413A (en) * 1972-10-16 1976-06-16 Mitsui Shipbuilding Eng Boilers
US4191246A (en) * 1979-03-05 1980-03-04 Combustion Engineering, Inc. Device to reduce local heat flux through a heat exchanger tube
DE2927977A1 (de) * 1979-06-20 1981-01-22 Bbc Brown Boveri & Cie Waermeaustauscher

Also Published As

Publication number Publication date
EP0165846B1 (de) 1988-09-28
DE3565310D1 (en) 1988-11-03
JPS60256702A (ja) 1985-12-18
US4721067A (en) 1988-01-26
FR2565322A1 (fr) 1985-12-06
FR2565322B1 (fr) 1986-08-01

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