[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

EP0165846B1 - Dispositif d'injection d'un liquide dans un tube et générateur de vapeur comportant ce dispositif - Google Patents

Dispositif d'injection d'un liquide dans un tube et générateur de vapeur comportant ce dispositif Download PDF

Info

Publication number
EP0165846B1
EP0165846B1 EP85401000A EP85401000A EP0165846B1 EP 0165846 B1 EP0165846 B1 EP 0165846B1 EP 85401000 A EP85401000 A EP 85401000A EP 85401000 A EP85401000 A EP 85401000A EP 0165846 B1 EP0165846 B1 EP 0165846B1
Authority
EP
European Patent Office
Prior art keywords
tube
cannula
centering
cone
fluid
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
EP85401000A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0165846A1 (fr
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/fr
Application granted granted Critical
Publication of EP0165846B1 publication Critical patent/EP0165846B1/fr
Expired legal-status Critical Current

Links

Images

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 enters 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 area of the steam generator to the base of the tubes wound by which 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.
  • a device for injecting a liquid into a tube of the type defined above is already known (US-A-4191 246).
  • This device comprises a cannula placed in the tube, and which has, in the direction of injection of the fluid, a passage of narrowed section followed by a divergent.
  • this device does not apply to the problem which is the basis of the invention. Its purpose is to reduce the heat transfer between the secondary fluid which circulates outside the tubes of the exchanger and the primary fluid which circulates inside these tubes at the orifices of passage of the tube plates.
  • the cannula is only a sleeve which has the function of partially isolating the wall of the tube from the primary fluid which circulates there.
  • 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 cannula comprising, in the direction of injection of the fluid, a passage of narrowed cross section relative to the diameter of the tube followed by a diverging portion at its bottom , and in that the means for centering and immobilizing in translation the cannula on the tube are constituted by a cylindrical centering part for centering the sheath in the tube, at least one slot and an internal cone formed in the sheath at its lower part , by an outer cone formed in the lower part of the cannula, the inner cone and the outer cone being adapted to cooperate, means being provided for resiliently applying the outer cone to the inner cone.
  • 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, located 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 enclosure, an inlet and an outlet for a secondary fluid, located in the water box, a plurality of vertical 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 cannula disposed inside from the inlet end of a tube and having a passage section narrowed relative to the diameter of the tube for the secondary fluid.
  • Said passage section of the cannula is followed, in the direction of circulation of the secondary fluid, by a diverging portion at its lower part, a sheath being coaxially 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.
  • the means for centering and immobilizing in translation the cannula on the tube are constituted by a cylindrical centering part, for centering the sheath in the tube, at least one slot and an internal cone formed in the sheath. at its lower part, by an outer cone formed at the lower part of the cannula, the inner cone and the outer cone being adapted to cooperate, means being provided for elastically applying the outer cone to the inner cone.
  • FIG 1 is a sectional and 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 casing 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.
  • a line 18 evacuates the vapor.
  • 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 and 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 conditions.
  • the Applicant has been able to establish that during its fall into the straight tubes, the water heats up and has time to reach its saturation temperature. Consequently, vapor bubbles are formed which tend to flow up the current too weak to entrain them. These bubbles accumulate at the entrance of the steam generator in the central area of the water box 7 and form there a mattress of steam, which abruptly condenses on contact with cold water which enters the steam generator. . This brutal condensation produces a depression which causes a reversal of the flow by sucking up 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 shows a sectional view of a preferred embodiment of an injection device of the invention.
  • Reference 8 designates the tube plate and reference 10a 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 the cannula.
  • the piece added by welding, in which the diverging part 222 is made, externally has 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 which the shoulder 221 ′ is produced 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 outside diameter is close to the inside diameter of the tube 10a.
  • the sheath also has a female cone 250 'adapted to cooperate with the male cone 250 of the cannula.
  • 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 plug 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 allowing the differential expansions between the cannula and the sheath to be made up for when injecting cold water.
  • the relative movement of the cannula relative to the sheath is done freely at the level of the head pieces and not under frictional 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)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Detergent Compositions (AREA)
EP85401000A 1984-05-29 1985-05-21 Dispositif d'injection d'un liquide dans un tube et générateur de vapeur comportant ce dispositif Expired EP0165846B1 (fr)

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 EP0165846A1 (fr) 1985-12-27
EP0165846B1 true EP0165846B1 (fr) 1988-09-28

Family

ID=9304496

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85401000A Expired EP0165846B1 (fr) 1984-05-29 1985-05-21 Dispositif d'injection d'un liquide dans un tube et générateur de vapeur comportant ce dispositif

Country Status (5)

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

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

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE554160C (de) * 1932-07-02 L & C Steinmueller Wasserrohrkessel
US3357409A (en) * 1964-10-07 1967-12-12 Atomic Energy Authority Uk Vertical tube module once-through steam generator
AT278863B (de) * 1968-01-15 1970-02-10 Waagner Biro Ag Verfahren und Einrichtung zur Vergleichmäßigung des Wärmeüberganges
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
JPS5723761Y2 (ja) * 1972-10-16 1982-05-24
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
US4191246A (en) * 1979-03-05 1980-03-04 Combustion Engineering, Inc. Device to reduce local heat flux through a heat exchanger tube
CH640631A5 (de) * 1979-06-20 1984-01-13 Bbc Brown Boveri & Cie Waermeaustauscher.
DE3027510C2 (de) * 1980-07-19 1987-04-09 Hochtemperatur-Reaktorbau GmbH, 4600 Dortmund Gewölbter Deckel zum Verschließen einer vertikalen Ausnehmung in einem Druckgefäß
US4579087A (en) * 1983-12-21 1986-04-01 Westinghouse Electric Corp. Corrosion resistant steam generator and method of making same

Also Published As

Publication number Publication date
US4721067A (en) 1988-01-26
FR2565322B1 (fr) 1986-08-01
FR2565322A1 (fr) 1985-12-06
EP0165846A1 (fr) 1985-12-27
JPS60256702A (ja) 1985-12-18
DE3565310D1 (en) 1988-11-03

Similar Documents

Publication Publication Date Title
FR2801648A1 (fr) Injecteur a vapeur haute pression comportant un drain axial
EP0162441A2 (fr) Séparateur de mélanges par centrifugation
EP0142424A2 (fr) Ejecteur-mélangeur à effet de trompe à section variable
FR2533621A1 (fr) Generateur du type a thermosiphon
FR2895271A1 (fr) Organe de deversement d'une enceinte de traitement, notamment d'hydrocarbures, et enceinte correspondant
FR2541138A1 (fr) Systeme a circulation forcee de liquide comportant un appareil a vortex
EP0165846B1 (fr) Dispositif d'injection d'un liquide dans un tube et générateur de vapeur comportant ce dispositif
CH622330A5 (ja)
FR2566511A1 (fr) Generateur de vapeur hybride a prechauffage et recirculation
EP0068958A1 (fr) Générateur de vapeur muni d'un dispositif de purge dynamique
EP0163336B1 (fr) Appareillage pour la fabrication de tuyaux en matière plastique orientée moléculairement
EP0275776B1 (fr) Dispositif de contrôle de la surchauffe et de l'entartrage pour un appareil de chauffage d'un fluide et appareil équipe d'un tel dispositif
EP0014140A1 (fr) Dispositif pour refroidir un produit long en défilement
FR2500324A1 (fr) Dispositif de melange homogene de liquides en ecoulement a des temperatures differentes
EP0068957B1 (fr) Dispositif distributeur pour échangeurs multitubulaires
EP0216667B1 (fr) Dispositif de retenue de liquide dans une canalisation sensiblement horizontale présentant une extrémité ouverte lorsque, le débit du liquide descend en-dessous d'un seuil donné
FR2686408A1 (fr) Echangeur de chaleur utilise pour le rechauffement d'un fluide secondaire tel que de l'eau de piscine ou de l'eau de mer.
FR2541434A1 (fr) Chauffe-eau instantane a gaz
FR2476296A1 (en) Water heater heat exchanger - has heating medium flowing through tube inside insulated open-ended water tube within water reservoir
FR2582786A1 (fr) Chauffe-liquide industriel a gaz
FR2525294A1 (fr) Diffuseur d'eau froide pour l'entree d'appareils rechauffeurs d'eau
RU2079727C1 (ru) Инжектор
FR2630027A1 (fr) Separateur de melanges par centrifugation
BE566748A (ja)
RU2044949C1 (ru) Конденсатоотводчик

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): CH DE GB IT LI NL

17P Request for examination filed

Effective date: 19860430

17Q First examination report despatched

Effective date: 19861112

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: COMMISSARIAT A L'ENERGIE ATOMIQUE

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE GB IT LI NL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 19880928

Ref country code: NL

Effective date: 19880928

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
REF Corresponds to:

Ref document number: 3565310

Country of ref document: DE

Date of ref document: 19881103

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Effective date: 19890531

Ref country code: LI

Effective date: 19890531

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

26N No opposition filed
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19901027

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19920303

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19920508

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19930521

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19930521