EP0200652A1 - Wärmeaustauscher mit durch Abstandsgitter quergehaltenem Geradrohrbündel und seine Anwendung - Google Patents

Wärmeaustauscher mit durch Abstandsgitter quergehaltenem Geradrohrbündel und seine Anwendung Download PDF

Info

Publication number
EP0200652A1
EP0200652A1 EP86400941A EP86400941A EP0200652A1 EP 0200652 A1 EP0200652 A1 EP 0200652A1 EP 86400941 A EP86400941 A EP 86400941A EP 86400941 A EP86400941 A EP 86400941A EP 0200652 A1 EP0200652 A1 EP 0200652A1
Authority
EP
European Patent Office
Prior art keywords
openings
tubes
heat exchanger
grids
spacer grids
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.)
Withdrawn
Application number
EP86400941A
Other languages
English (en)
French (fr)
Inventor
René Traiteur
Jean-Luc Minguet
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.)
Novatome SA
Original Assignee
Novatome 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 Novatome SA filed Critical Novatome SA
Publication of EP0200652A1 publication Critical patent/EP0200652A1/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/007—Auxiliary supports for elements
    • F28F9/013—Auxiliary supports for elements for tubes or tube-assemblies
    • F28F9/0135—Auxiliary supports for elements for tubes or tube-assemblies formed by grids having only one tube per closed grid opening

Definitions

  • the invention relates to a heat exchanger with a bundle of straight tubes with circular pitch, the transverse support of which is ensured by spacer grids.
  • Straight tube bundle heat exchangers are very often used as steam generators in nuclear reactors, in particular those cooled by liquid metal.
  • the reactor coolant allows the heating and the vaporization of feed water which can be circulated inside the tubes or, on the contrary, in contact with the external surface of these tubes.
  • the reactor coolant circulates either outside the tubes, inside the envelope of the steam generator containing the bundle, or inside the tubes, respectively.
  • the size of the steam generators can be considerable and in particular, in the case of a steam generator with straight tubes, the length of the tubes and of the envelope enclosing the bundle as well as the number of tubes can be very large. It is therefore necessary to use spacer grids fixed inside the envelope of the steam generator, spaced from one another along the length of the tubes, to ensure the transverse maintenance and the intersection of the tubes of the bundle. Such spacer grids must allow not only the maintenance of the tubes against the stresses of the exchange fluids circulating in contact with them at high speed but also the passage of the exchange fluid circulating outside the tubes in the longitudinal direction of the generator. steam. The pressure drop in this fluid change must be as small as possible and it is therefore necessary to provide a large passage section for this fluid relative to the total straight section of the steam generator.
  • this arrangement cannot be used in the case of other types of network, for example in the case of networks with circular pitch, that is to say constituted by circular, coaxial and equidistant rows of tubes, inside which the tubes are spaced by a constant arc length.
  • networks with circular pitch that is to say constituted by circular, coaxial and equidistant rows of tubes, inside which the tubes are spaced by a constant arc length.
  • spacer grids comprising a first set of openings for holding the tubes and a second set of openings for the passage of the coolant.
  • spacer grids are however very difficult to machine and are produced by juxtaposing pre-factory plates of limited size.
  • the coolant passage openings do not have a constant section over the entire plate and / or the wall thicknesses vary within unacceptable limits.
  • the object of the invention is therefore to propose a heat exchanger with a bundle of straight tubes and with circular pitch, the transverse maintenance of which is ensured by spacer grids, comprising an envelope enclosing the tubes inside which circulates a first fluid d exchange, a second exchange fluid circulating in the envelope, outside the tubes, and a set of spacer grids for transversely holding the tubes, fixed inside the envelope, spaced apart from one another according to the length of the tubes and constituted by flat metal plates traversed by a first set of openings arranged in a regular network with circular pitch corresponding to the arrangement of the tubes in the planes of cross section of the bundle and by a second set of openings for the passage of the second exchange fluid, interposed between the openings of the first assembly, this heat exchanger operating under very good thermal and useful conditions ising of spacer grids whose design and machining are relatively simple and satisfactory thermal shock resistance.
  • the openings of the second set have a quadrilateral section and a substantially constant area and provide between them and with the openings of the first set of partition walls having a substantially constant thickness.
  • the openings constituting the second set have a section in the form of a parallelogram.
  • Fig. 1 is a sectional view through a vertical plane of symmetry of the steam generator with straight tubes.
  • Fig. 2 is a fragmentary top view of a spacer grid of the steam generator shown in FIG. 1.
  • Fig. 3 is a sectional view along III-III of FIG. 2 showing a support means for the spacer grid.
  • a steam generator comprising an external envelope 1 enclosing a bundle of straight tubes 2.
  • Each of the tubes 3 of the bundle is fixed at one of its ends in a lower tubular plate 4 and at its other end in a plate upper tubular 5.
  • the casing 1 comprises a cylindrical central body constituting the casing of the bundle 2 and two end portions 6 and 7 with a larger diameter sur_lesrise which are fixed the tubular plates 4 and 5, respectively.
  • the lower tubular plate 4 is in communication via its external face with a water collector 10 receiving the supply water from the steam generator by a tube 11.
  • the collector 10 makes it possible to distribute the supply water in the tubes 3 of the bundle 2, this feed water constituting the first exchange fluid of the steam generator.
  • the upper part 7 of the casing 1 receives, via an inlet pipe 12, hot liquid sodium, which then flows from top to bottom in the bundle casing 1, in contact with the outer surface of the tubes 3 and which constitutes the second exchange fluid.
  • the feed water circulating in the tubes 3 is thus heated and then vaporized, the vapor formed being recovered by a vapor collector 14 then evacuated by a tube 15.
  • the cooled liquid sodium after its circulation in contact with the tubes of the bundle, leaves the envelope 1 by a tube 13 provided in part 6 of this envelope.
  • the tubes 3 of the bundle 2 are maintained and braced by spacer grids 18 fixed inside the central body of the envelope. These spacer grids 18 allow both the holding of the tubes in the transverse directions and the passage of the sodium, outside the tubes, in the vertical direction, according to the arrows 19.
  • a spacer grid 18 comprising a first set of openings 20 of circular shape and a second set of openings 21 in the form of a quadrilateral.
  • the openings 20 have diameters very slightly greater than the diameters of the tubes 3 and are arranged in successive rows 20a, 20b, 20c circular, equidistant and coaxial. In each of the rows, the successive openings 20 have identical spacings in arc distance.
  • the tubes 3 of the bundle are engaged in the openings 20 and perfectly maintained inside these, the clearance between the tube 3 and the opening 20 being small.
  • tubes of bundle 2 which have a diameter of 15.10 m
  • the pitch of the circular network of tubes is 35.10 m and the clearance between the tubes 3 and the openings 20, from 0.2 to 0.5.10 m, depending on the tolerances.
  • the openings 21 are in the form of parallelograms with rounded or flattened angles.
  • the shape and dimensions of these parallelograms are slightly modified from one row to another and strongly mo- d i f ied in the vicinity of the periphery of the spacer grid, where openings 30 replacing the openings 21 approximately correspond to the half of the section of the openings 21.
  • the shape and the distribution of the openings 21 are profoundly modified in the vicinity of the axis XX 'of the spacer grid 18 along which is placed a set of supports 32 of the spacer grid 18 which will be described later in the text.
  • the openings 21 however keep the form of quadrilaterals in the vicinity of the axis XX '.
  • the shape and distribution of the openings 20 and 21 make it possible to obtain a thickness of the walls 23 for the separation of the openings which is practically constant.
  • This wall thickness corresponds to the thickness of metal between two adjacent openings, in a direction contained in the plane of the spacer grid 18.
  • the area of the openings 21 remains practically constant over the whole of the spacer grid 18, with the exception of the peripheral zone where the openings 30 have a shape and a size different from those of the openings 21. This constant area allows '' obtain a homogeneous distribution of the liquid sodium flow throughout the section of the spacer grid.
  • a spacer grid as shown in FIG. 3 can be obtained by molding or by electrochemical machining of a steel plate.
  • the spacer grid 18 shown in FIG. 3 includes notches such as 33 in the direction X'X.
  • One in check mark 33 is formed on the spacer grid 18, at each of its ends, in the radial direction X'X and also at each of its ends, in the radial direction perpendicular to X'X.
  • each of the support devices 32 of the plate 18 comprises a support element 34 welded at 35 on the inner surface of the casing 1, by means of its lower part and engaged, by its upper part, with the interior of the corresponding notch 33 of the grid 18.
  • the upper part of the support element 34 is notched so as to provide bearing edges for the spacer grid 18 engaged with play in the element 34 by its part 33.
  • the spacer grid 18 is thus maintained in the vertical directions relative to the casing 1 but remains free to expand in the radial direction.
  • the plates used to make the spacer grids can be made of ferritic steel containing 2.25% chromium and 1% molybdenum or steel with 5 / or 9% chromium and 1% molybdenum or even austenitic steel of the grade 316L.
  • a surface treatment such as chrome plating or aluminization.
  • Such a surface treatment makes it possible to limit the wear of the tubes and the attack of these tubes by fretting corrosion, during the operation of the steam generator.
  • the liquid sodium circulates in the vertical direction, outside the tubes, in the casing 1 and passes through the spacer plates by the openings 21 almost exclusively, the clearance between the tubes 3 and the openings 20 being very small.
  • the distribution of the sodium flow in the straight sections of the steam generator is thus perfectly homogeneous, which provides excellent thermal operating conditions.
  • the small and substantially constant thickness of the walls 23 surrounding the openings 20 and 21 prevents the appearance of thermal gradients at the level of the spacer grids and reduces the risk of damage by thermal shock.
  • the main advantages of the heat exchanger according to the invention are therefore very good thermal operation, thanks to a homogeneous distribution of the exchange fluid circulating outside the tubes, a precise arrangement and effective maintenance of the beam tubes, very good thermal shock resistance of the spacer grids and easier design and machining of these spacer grids.
  • openings of different forms from those which have been described, for example other forms of quadrilateral, more or less deformed and with rounded angles, to constitute the second set.
  • the openings of the first set can be used only for holding the tubes or both for holding the tubes and the passage of the second exchange fluid; for example, three-lobed sections will be used in the second case, for the openings of the first set.
  • complementary forms of the openings belonging to one and to the other. of the two assemblies in order to obtain a wall thickness separating these openings and a fluid passage section as constant as possible.
  • the heat exchanger according to the invention can not only be used as a steam generator in a nuclear reactor but also for any heat exchange between two fluids in industries such as the chemical industry.

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)
EP86400941A 1985-05-03 1986-04-29 Wärmeaustauscher mit durch Abstandsgitter quergehaltenem Geradrohrbündel und seine Anwendung Withdrawn EP0200652A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8506766 1985-05-03
FR8506766A FR2581443B1 (fr) 1985-05-03 1985-05-03 Echangeur de chaleur a faisceau de tubes droits dont le maintien transversal est assure par des grilles entretoises et ses applications

Publications (1)

Publication Number Publication Date
EP0200652A1 true EP0200652A1 (de) 1986-11-05

Family

ID=9318938

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86400941A Withdrawn EP0200652A1 (de) 1985-05-03 1986-04-29 Wärmeaustauscher mit durch Abstandsgitter quergehaltenem Geradrohrbündel und seine Anwendung

Country Status (2)

Country Link
EP (1) EP0200652A1 (de)
FR (1) FR2581443B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107388584A (zh) * 2017-08-25 2017-11-24 东方电气集团东方锅炉股份有限公司 一种阔通流的加热器导流装置
CN109237755A (zh) * 2018-11-08 2019-01-18 上海士诺净化科技有限公司 一种可通用不同换热芯的热交换机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2128747A1 (de) * 1971-03-10 1972-10-20 Siemens Ag
US4192374A (en) * 1977-02-04 1980-03-11 United Kingdom Atomic Energy Authority Heat exchangers
GB2057669A (en) * 1979-08-15 1981-04-01 Sulzer Ag Supporting grid for heat exchanger elements and method of making such grids
EP0036347A1 (de) * 1980-03-07 1981-09-23 COMMISSARIAT A L'ENERGIE ATOMIQUE Etablissement de Caractère Scientifique Technique et Industriel Zwischenwärmeaustauscher für Nuklear-Reaktor mit schnellen Neutronen
WO1983000381A1 (en) * 1981-07-15 1983-02-03 Turbine Metal Technology Inc Bearing surfaces in nuclear reactor heat exchangers and the like

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3989105A (en) * 1972-02-22 1976-11-02 Georges Trepaud Heat exchanger
FR2293684A2 (fr) * 1974-12-05 1976-07-02 Trepaud Georges Echangeur de chaleur a faisceau tubulaire

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2128747A1 (de) * 1971-03-10 1972-10-20 Siemens Ag
US4192374A (en) * 1977-02-04 1980-03-11 United Kingdom Atomic Energy Authority Heat exchangers
GB2057669A (en) * 1979-08-15 1981-04-01 Sulzer Ag Supporting grid for heat exchanger elements and method of making such grids
EP0036347A1 (de) * 1980-03-07 1981-09-23 COMMISSARIAT A L'ENERGIE ATOMIQUE Etablissement de Caractère Scientifique Technique et Industriel Zwischenwärmeaustauscher für Nuklear-Reaktor mit schnellen Neutronen
WO1983000381A1 (en) * 1981-07-15 1983-02-03 Turbine Metal Technology Inc Bearing surfaces in nuclear reactor heat exchangers and the like

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107388584A (zh) * 2017-08-25 2017-11-24 东方电气集团东方锅炉股份有限公司 一种阔通流的加热器导流装置
CN109237755A (zh) * 2018-11-08 2019-01-18 上海士诺净化科技有限公司 一种可通用不同换热芯的热交换机

Also Published As

Publication number Publication date
FR2581443A1 (fr) 1986-11-07
FR2581443B1 (fr) 1988-12-02

Similar Documents

Publication Publication Date Title
EP0167418B1 (de) Doppelwandiges Rohr für Wärmetauscher und dessen Herstellungsverfahren
EP0639741B1 (de) Wärmetauscher mit Haltevorrichtung für zwischen die Rohre eingelegte Dämpfungsstangen
EP3405723B1 (de) Kondensationswärmetauscher mit einer wärmetauschervorrichtung
EP0006795B1 (de) Zwischenwärmeaustauscher für Kernreaktor mit schnellen Neutronen
EP1091169B1 (de) Dampferzeuger mit einer Verteilungsplatte zur Speisewasserströmungsverbesserung oberhalb der Rohrplatte
FR2832496A1 (fr) Echangeur de chaleur du type helicoidal
EP0078728B1 (de) Schwingungsdämpfende Halterung für ein Rohrbündel, insbesondere für einen Dampferzeuger, und Verfahren zum Montieren dieser Halterung
EP0467755B1 (de) Vorrichtung für schwingungsneutralisierendes Festsetzen von Wärmetauscherrohren
EP0654636B1 (de) Vorrichtung für schwingungsneutralisierendes Festsetzen von Wärmetauscherrohren und seine Verwendung
EP0955498A1 (de) Dampferzeuger mit verbesserter Wasserzufuhrvorrichtung
EP0076748A1 (de) Kernreaktor-Brennstoffbündel
FR2848292A1 (fr) Plaque d'un echangeur thermique et echangeur thermique a plaques
EP0200652A1 (de) Wärmeaustauscher mit durch Abstandsgitter quergehaltenem Geradrohrbündel und seine Anwendung
EP0173586B1 (de) Wärmetauscher mit Rohrbündel, von einer zylindrischen Hülle umgeben, welche radial in einer äusseren Hülle festgehalten wird
EP0173602B1 (de) Notwärmetauscher zur Kühlung des Primärmittels eines Kernreaktors und Verfahren zu dessen Zusammenbau
FR2694071A1 (fr) Procédé et dispositif de réglage d'un débit d'eau d'alimentation dans un tube d'un générateur de vapeur.
FR2880106A1 (fr) Dispositif d'echange de chaleur entre deux fluides comportant des couches de mousse metallique
FR2858845A1 (fr) Echangeur de chaleur et procede de fabrication
EP0277892A1 (de) Kühlvorrichtung eines thermonuklearen Fusionsreaktors und modularer Auskleidungsblock zur Herstellung einer Wand für eine derartige Vorrichtung
EP0287422B1 (de) Zwischenträgergitter zur Querabstützung der Rohre eines Wärmetauscherrohrbündels und Montageverfahren eines solchen Zwischenträgergitters
EP0082780B1 (de) Dampferzeuger durch Wärmeaustauschung zwischen einem flüssigen, kalorienreichen Metall und Speisewasser
FR2851031A1 (fr) Generateur de vapeur comportant un dispositif de fourniture d'eau d'alimentation realisant le piegeage de corps etrangers
FR2761453A1 (fr) Piece destinee en particulier a la fixation de deux corps de chauffe d'un radiateur de chauffage
FR2494421A1 (fr) Element d'echange de chaleur
BE1001020A3 (fr) Echangeur de chaleur a metal liquide, avec un rang de tubes.

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

Kind code of ref document: A1

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

17P Request for examination filed

Effective date: 19861010

17Q First examination report despatched

Effective date: 19871125

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

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19880329

RIN1 Information on inventor provided before grant (corrected)

Inventor name: MINGUET, JEAN-LUC

Inventor name: TRAITEUR, RENE