EP1902266B1 - Ensemble d'echange de chaleur, notamment pour reacteur nucleaire a haute temperature - Google Patents

Ensemble d'echange de chaleur, notamment pour reacteur nucleaire a haute temperature Download PDF

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Publication number
EP1902266B1
EP1902266B1 EP06778635A EP06778635A EP1902266B1 EP 1902266 B1 EP1902266 B1 EP 1902266B1 EP 06778635 A EP06778635 A EP 06778635A EP 06778635 A EP06778635 A EP 06778635A EP 1902266 B1 EP1902266 B1 EP 1902266B1
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EP
European Patent Office
Prior art keywords
fluid
assembly according
axial
output
input
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Not-in-force
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EP06778635A
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German (de)
English (en)
French (fr)
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EP1902266A1 (fr
Inventor
Alain Cros
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Areva NP SAS
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Areva NP SAS
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Publication of EP1902266A1 publication Critical patent/EP1902266A1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • 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
    • F28F9/02—Header boxes; End plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0006—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the plate-like or laminated conduits being enclosed within a pressure vessel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0054—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for nuclear applications
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/10—Particular pattern of flow of the heat exchange media
    • F28F2250/108—Particular pattern of flow of the heat exchange media with combined cross flow and parallel flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/26—Safety or protection arrangements; Arrangements for preventing malfunction for allowing differential expansion between elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2280/00—Mounting arrangements; Arrangements for facilitating assembling or disassembling of heat exchanger parts
    • F28F2280/02—Removable elements

Definitions

  • the invention generally relates to heat exchangers, in particular for high temperature (HTR) or very high temperature (VHTR) nuclear reactor.
  • HTR high temperature
  • VHTR very high temperature
  • the invention aims to provide a heat exchange assembly where the risk of such breaks is greatly reduced, both in normal operation and in an accident situation.
  • the invention relates to an assembly of the above-mentioned type, characterized in that it comprises an inlet chamber provided with a first axial side of the exchangers, putting into communication the inlet (s) of the second fluid with at least several axial inlet manifolds.
  • the set 1 represented on the figures 1 and 2 is intended to be used in a high temperature or very high temperature nuclear reactor (HTR / VHTR), to achieve a heat exchange between a first fluid and a second fluid.
  • HTR / VHTR very high temperature nuclear reactor
  • the first fluid is the primary fluid of the nuclear reactor, and circulates in a closed loop therein. It passes through the heart of the nuclear reactor (not shown), then crosses the assembly 1 and finally returns to the entrance of the heart.
  • the primary fluid is heated in the reactor core, and exits from it for example at a temperature of about 850 ° C. He gives up some of its heat to the secondary fluid in the assembly 1, and leaves it for example at a temperature of 450 ° C.
  • the primary fluid is typically substantially pure helium gas.
  • the second fluid is the secondary fluid of the nuclear reactor, and circulates in a closed loop therein. It passes through the assembly 1, then passes into a gas turbine driving an electric generator and returns to the input of the assembly 1.
  • the secondary fluid enters the assembly 1, for example at a temperature of 405. ° C about and comes out for example at 805 ° C.
  • the secondary fluid is a gas comprising mainly helium and nitrogen.
  • the chamber 2 comprises a tank 30 inside which are disposed the exchangers 12 and the collectors 14, 16, 18, 20, presenting upwardly an opening 32, and a removable cover 34 for sealing the opening 32 of the tank 30.
  • the tank 30 comprises a cylindrical top ferrule 36, coaxial with the X axis, a cylindrical lower ferrule 38, coaxial with the X axis, disposed under the upper ferrule 36, of slightly reduced diameter with respect to the ferrule 36, a frustoconical ferrule 40 interposed between the ferrules 36 and 38, and a bottom curved bottom 42, closing the ferrule 38 downwards.
  • the upper free edge of the ferrule 36 surrounds the opening 32 and forms a flange 44.
  • the lid 34 is curved upwards, and has a free edge forming a flange 46 complementary to the flange 44 of the tank 30.
  • the lid 34 has a bottom section substantially in elliptical portion in a plane containing the axis X.
  • the cover 34 is capable of being rigidly fixed to the tank 30 by means of eighty tie rods 50 engaged in holes 52 formed on the flange 46, and screwed into threaded orifices 54 formed on the flange 44.
  • flange 46 carries a high-sealing metal gasket 55, for example of the type sold under the trade name "HELICOFLEX", sealing between the lid 34 and the tank 30 when they are fixed to one another.
  • the inputs 8 of the secondary fluid are provided at the bottom of the ferrule 36, on the same circumference thereof. They are arranged all four on the same half of the ferrule 36, as shown in FIG. figure 4 . These inputs are circular, and have axes arranged at 42 ° from each other.
  • the outputs of the secondary fluid 10 are formed at the top of the upper ferrule 36, and are arranged on the same circumference of this ferrule ( figure 3 ). They are located on the same half of the shell 36 as the inputs 8. As for the inputs, these outlets 10 are circular and their axes are spaced 42 °.
  • the lower shell 38 comprises a single stitching through which are formed the inlet 4 and the outlet 6 of the primary fluid.
  • Input 4 and output 6 are coaxial, as shown in figure 2 , the output 6 surrounding the input 4.
  • the bottom 42 is curved downwards, and has a central, round opening, centered on the X axis, in which the fan 28 is fixed.
  • the eight heat exchangers 12 are arranged in a circle about the X axis, and regularly distributed around it.
  • the exchangers 12 are plate type heat exchangers. Each exchanger 12 comprises eight modules 56 stacked vertically, identical to each other.
  • each module 56 has a parallelepipedal shape.
  • Each module 56 comprises an outer casing 58 in which are machined inlet and outlet ports 60 and 62 of the primary fluid and inlet and outlet ports 64 and 66 of the secondary fluid, and a plurality of plates 67 disposed at inside the casing 58, stacked axially.
  • the slots 60 and 62 are arranged on two opposite faces of the casing 58, turned respectively inwards and outwards of the assembly 1.
  • the apertures 64 and 66 are formed on two substantially radial and opposite sides of the casing. envelope 58 ( Figures 6A to 6C ).
  • the stacked plates 67 define between them a plurality of primary fluid flow channels extending radially from the lumen 60 to the lumen 62.
  • the plates 67 also define between them a plurality of secondary fluid circulation channels, extending substantially circumferentially, from the lumen 64 to the lumen 66. It will be noted that the lumen 64 is offset radially outwards with respect to the light 66, so that the secondary fluid circulates Z in the module 56, as shown in FIG. Figure 6B .
  • the circulation channels of the primary and secondary fluids are superimposed alternately in the module 56, so as to improve the efficiency of the heat exchange between the fluids.
  • the radial circulation channels of the primary fluid do not open along the two radial faces of the module 56, so that the secondary fluid can not enter these channels through the slots 64 and 66.
  • the circulation channels substantially circumferences of the secondary fluid do not open along the inner and outer faces of the module 56, so that the primary fluid can not enter these channels through the lights 60 and 62.
  • the parallelepipedal modules 56 have machined angles over the entire axial height of the exchanger 12.
  • This exchanger 12 furthermore comprises forged and machined metal bars 68 arranged in the machined angles of the modules 56. These bars 68 extend over the entire axial height of the exchanger 12.
  • the modules 56 are welded to each other by their respective envelopes 58, and are also welded to the metal bars 68.
  • the bars 68 comprise a main portion 70 of rectangular section perpendicular to the X axis, disposed in the machined portions of the modules 56, and a flange 72 projecting circumferentially with respect to the modules 56.
  • the main part 70 is welded to the modules 56 along two axial welding lines 74 and 76, visible on the Figures 7, 8A and 8B .
  • the line 74 extends along radial faces of the modules 56
  • the line 76 extends along the inner faces or along the outer faces of the modules 56, depending on the case.
  • axial empty channels 78 are machined in the modules 56 and in the bars 68, behind the weld lines 74 and 76, and over the entire length thereof. The presence of these empty channels 78 makes it possible to carry out quality control of the welds 74 and 76 by ultrasound.
  • the wings 72 are connected to the radial faces of the modules 56 according to a predetermined radius of curvature R, calculated so as to reduce the stresses in the bars 68.
  • the modules 56 are also welded to one another along the weld lines 79. These weld lines 79 follow the edges delimiting the radial, inner and outer faces of the modules 56, downwards and upwards.
  • the assembly 1 comprises four axial inlet manifolds 18 communicating with the inlet 8 of the secondary fluid via the inlet chamber 22, and four axial output channels 20 communicating with each other. with the outlet 10 of the secondary fluid via the outlet chamber 24.
  • the collectors 18 and 20 are interposed circumferentially between the exchangers 12, as shown in FIG. figure 5 .
  • the axial inlet and outlet manifolds 18 are distributed alternately around the central axis X, so that one can find successively, by turning around the central axis X, an exchanger 12, an axial collector of input 18, an exchanger 12, an axial outlet manifold 20, an exchanger 12, an axial inlet manifold 18, etc.
  • the axial collectors 18 and 20 each have a section perpendicular to the axis X in ring sector, delimited inwards and outwards by circumferential plates respectively 80 and 82, and on the sides by the radial faces of the exchangers 12 between which extends said collector.
  • the inner and outer plates 80 and 82 of an axial collector 18 or 20 given are welded edge to edge on the flanges 72 of the bars 68 of the two adjacent exchangers 12 of the collector.
  • the shape of the wings 72 is determined such that these wings are in the continuity of the inner or outer plates 80 or 82 ( Figures 8A and 8B ).
  • the modules 56 are oriented such that the input window 64 opens into an axial input channel 18, and the output window 66 opens into an axial output channel 20.
  • the assembly 1 further comprises a central collector 14 extending along the axis X and communicating with the inlet 4 of the primary fluid, and an annular channel 16 communicating with the outlet 6 of the primary fluid.
  • the central collector 14 extends radially inside the exchangers 12 and is delimited by the inner faces of the modules 56 and the inner plates 80. It has substantially a circular section perpendicular to the axis X. The windows 60 open into the central collector 14.
  • the annular collector 16 extends around the exchangers 12, radially outwardly with respect thereto. It is bounded inwards by the outer plates 82 and the outer faces of the modules 56. The windows 62 open into the annular collector 16.
  • the inlet and outlet chambers 22 and 24 of the secondary fluid are respectively located under the exchangers 12 and above these exchangers 12 (FIG. figures 1 and 2 ).
  • the central collector 14 is extended axially downwards by an intermediate cylindrical section 84 arranged under the exchangers 12.
  • the annular collector 16 extends axially downwards by an intermediate annular section 86 surrounding the intermediate cylindrical section 84.
  • the inlet chamber 22 has an annular shape and is located axially at the inputs 8 of the secondary fluid. It surrounds the intermediate cylindrical section 84 and extends radially inside the intermediate annular section 86. The inlet chamber 22 is delimited radially outwards by a cylindrical wall 85.
  • the assembly 1 comprises a visiting channel 88 extending the collector 14 axially upwards beyond the exchangers 12.
  • This channel 88 is isolated from the central collector 14 by a removable door 90. It is also closed to the top by another detachable inspection hatch 92.
  • the outlet chamber 24 also has an annular shape and surrounds the visit channel 88.
  • the axial inlet channels 18 are open downwards and communicate with the inlet chamber 22. They are closed upwards and isolated from the outlet chamber 24. Conversely, the axial outlet channels 20 are closed downwards. and isolated from the inlet chamber 22, and are open upwards and communicate with the outlet chamber 24.
  • the annular collector 16 is closed upwards and does not communicate with the outlet chamber 24.
  • the heat exchangers 12, the inlet and outlet chambers 22 and the collectors 14, 16, 18 and 20 are assembled in a removable mechanical subassembly 94 in one piece out of the enclosure 2. This subassembly is represented on the figure 9 .
  • the subassembly 94 has a generally cylindrical shape, of axis X.
  • the subassembly 94 is delimited upwards by a plane circular plate 96, radially outwards by a cylindrical envelope 98, and downwards by a frustoconical envelope 100 extending the cylindrical envelope 98 downwards and converging from of it.
  • the upper plate 96 delimits the outlet chamber 24 upwards ( figures 1 and 2 ).
  • the survey channel 88 extends upwardly projecting above the plate 96 and forms a grasping head 102 of the subassembly 94.
  • the trap 92 is located at the top plate 96.
  • the subassembly 94 further comprises an engagement ring 104 surrounding the upper plate 96 ( figure 9 ), projecting radially outwardly relative to the casing 98.
  • This ring 96 forms downwardly a bearing surface 106.
  • the flange 44 comprises, on a radially internal side, a complementary bearing surface 108, on which rests the bearing 106 when the subassembly 94 is disposed inside the tank 30.
  • the subassembly 94 further comprises four stiffeners 108 extending radially from the mushroom 102 to the crown 104.
  • the outer casing 98 delimits radially outwardly the outlet chamber 24 and the annular collector 16, in particular the intermediate section 86 of this collector. It is pierced with four circular holes 110 in the upper part and four circular holes 112 in the lower part, arranged in the extension respectively of the outputs 10 of the secondary fluid and the inputs 8 of the secondary fluid when the subassembly 94 is disposed in the enclosure 2.
  • the subassembly 94 also includes a horizontal annular floor 114 ( figures 1 and 2 ), delimiting the inlet chamber 22 downwards and extending between the respective sections 84 and 86 of the central and annular collectors 14 and 16.
  • central collector 14 extends under the section 84 by a lower cylindrical section 116 of axis X, ending downwards by a free edge 118 ( figure 2 ).
  • the frustoconical envelope 100 surrounds the lower section 116, and ends downwards by a cylindrical rim 120, of axis X.
  • the annular section 86 of the annular collector 16 opens downwards between the lower section 116 and the frustoconical envelope 100.
  • the subassembly 94 comprises a stiffening ferrule 122, perforated to allow the circulation of the primary fluid, arranged around the lower section 116.
  • This lower ferrule 122 is welded up on the floor 114 and down on the frustoconical ferrule 100.
  • Radial stiffeners 124 are welded to both the floor 114 on the frustoconical shell 100 and the lower shell 122, and increase the stiffness of the subassembly 94 in the lower part.
  • An external cylindrical shell 126 ( figure 12 ) is welded under the frustoconical casing 100. It extends near the frustoconical shell 40 of the tank 30.
  • This outer shell is reinforced by six radial stiffeners 128, welded to both the frustoconical casing 100 and on the outer shell 126.
  • These stiffeners 128 carry three keys 130, represented on the figure 12 , cooperating with axial grooves 132 formed on the ferrule 40 of the tank 30.
  • the keys 130 and the grooves 132 are arranged at 120 ° from each other about the X axis and allow the subassembly 94 to be indexed in rotation around the X axis.
  • the outlet chamber 24 is sealingly connected to the outlets 10 of the second fluid by external 140 and internal 142 cuffs, visible on the figure 10A .
  • the outer sleeve 140 is screwed onto an annular piece 144 welded into the outlet 10. It has a tubular shape and extends from the outlet 10 inwards, so that it is engaged in the hole 110 of the outer casing 98.
  • the fixing screws 146 are accessible from the inside of the outlet chamber 24.
  • the hole 110 is surrounded by an edge 148 raised towards the inside of the outlet chamber 24 from the casing 98.
  • the internal cuff 142 has a tubular shape and is interposed between the outer sleeve 140 and the erected edge 148. It is fixed by screws 150 on the free end of the erected edge 148.
  • High-sealing metal seals of known type, sold under the trade name "HELICOFLEX", are interposed between the outer sleeve 140 and the crown piece 144, on the one hand, and between the inner sleeve 142 and the upright edge 148, on the other hand.
  • a tubular bellows 154 connects the sleeves 140 and 142 to one another in a sealed manner.
  • the sleeves 140 and 142 are free to slide relative to each other in a direction radial to the X axis, the seal being maintained by the bellows 144.
  • Insulation blocks 156 isolate the bellows 154 and the screws 146 of the secondary fluid flowing from the outlet chamber 24 to the outlet 10.
  • the inlet chamber 22 is sealingly connected to the inlets 8 by external cuffs 158 and internal 160 similar to the outer and inner cuffs 140 and 142 described above (FIG. figure 10B ).
  • the erected edge 148 extends, in this case, from the outer casing 98 beyond the cylindrical wall 85 to the inside of the inlet chamber 22.
  • the cylindrical wall 85 is welded on the erected edge 148.
  • the erected edge 148 thus provides a sealed passage from the inlet chamber 22 through the annular intermediate portion 86 of the collector 16, to the outer casing 98.
  • the outer and inner cuffs 158 and 160 and the bellows 154 are not insulated due to the moderate temperature of the secondary gas at the inlet of the assembly 1.
  • the visiting channel 88 comprises a wide opening (163) which provides access to the disconnection systems of the outlet chamber 24.
  • the intermediate section 84 of the manifold 14 comprises a manhole 164 communicating with the inlet chamber 22 ( figure 2 ). This manhole 164 is closed sealingly by a removable hatch. A manhole (not shown) provided with a removable hatch makes it possible to access the annular channel 16 from one of the axial outlet channels 20.
  • the lower internals 26 include coaxial X-axis lower input 170 and output 172 collectors communicating with each other. respectively with the inlet 4 and the outlet 6 of the primary fluid ( figure 2 ).
  • the lower outlet manifold 172 surrounds the lower inlet manifold 170.
  • the lower inlet manifold 172 is connected to the inlet 4 by a radial pipe 174, which passes through the lower outlet manifold 172.
  • the manifold 172 is welded with sealed manner around the piping 174.
  • the lower inlet manifolds 170 and outlet 172 end one and the other upwards by flanges 176 capable of sealingly receiving the free edge 118 of the central collector 14 and the flange 120 of the frustoconical envelope 100 by simple interlocking.
  • the flanges 176 have inward frustoconical bearing surfaces guiding the free edge 118 and the flange 120. Moreover, the latter carry outwardly metal seals providing a sealed contact with the inner face of the flanges 176.
  • the lower outlet manifold 172 is closed downward by a bottom 178 perpendicular to the X axis.
  • the lower inlet manifold 170 comprises a cylindrical shell 180 of X axis extending to the bottom 178 and a bottom 182. perpendicular to the X axis closing the ferrule 180 at an intermediate level between the pipe 174 and the bottom 178.
  • the bottom 178 is pierced by a central opening 184 receiving the suction of the fan 28. Furthermore, the shell 180 has passage openings 186 under the bottom 182, thus creating a passage path for the primary fluid from the lower collector outlet 172 through the openings 186 to the volume between the funds 178 and 182 and in the suction of the fan 28.
  • the lower internals 26 further comprise a frustoconical ferrule 188 converging upwards, whose large base is welded to the lower ferrule 38 of the tank 30 and whose small base is welded around the lower outlet manifold 172.
  • the frustoconical ferrule 188 has passage openings 190. These openings put in communication the volume located under the lower inlet and outlet collectors 170 and 172 with the volume located around these same lower collectors.
  • the outlet 6 of the primary fluid opens directly into the volume located around the lower collectors 170 and 172.
  • the fan 28 discharges the primary fluid through radial openings inside the curved lower bottom 42, the primary fluid being able to flow from there through the openings 190 upwards, then through the outlet 6.
  • the tank 30 comprises three support blocks 194, integrated and welded into the lower shell 38.
  • the blocks 194 are arranged at 120 ° from each other about the X axis. As shown in FIG. figure 13 the assembly 1 rests, through the blocks 194, on concrete masses 196 projecting from the walls of the cell 197 in which the assembly 1 is arranged.
  • Flying buttresses 198 interposed between the walls of the cell and the upper ferrule 36 of the tank 30, stabilize the assembly 1 in the vertical position.
  • the hottest parts of the assembly 1 are insulated, for example by blocks comprising Al 2 O 3 fibers or carbon fibers. These parts operate at temperatures close to or above 800 ° C in nominal operation. These are the pipework 174, the lower inlet manifold 170, the central manifold 14, including its intermediate sections 84 and lower 116, the axial outlet manifolds 20, the outlet chamber 24, and the cuffs 140. and 142 connecting the outlet chamber 24 to the outlets 10 of the secondary fluid.
  • the enclosure 2 has a total height of about 27 m, and a diameter of about 7 m.
  • the cylindrical envelope 98 has a diameter of about 6300 mm.
  • Each exchanger 12 has an axial height of about 4800 mm, a radial depth of about 1300 mm, and a circumferential width of about 560 mm.
  • Each module 56 has a height of about 600 mm.
  • the diameter of the central collector 14 is about 2800 mm. It is determined so that the inner sheets 80 delimiting the axial collectors 18 and 20 have a circumferential developed length and a sufficient flexibility to recover the deformations imposed in a plane perpendicular to the X axis by the exchangers 12.
  • the radial depth of the annular collector 16 is about 500 mm. It is determined so that an operator can slip inside the annular collector 16, so as to perform checks and / or repairs on the outer face of the exchangers 12.
  • the secondary fluid inlets 8 have passage diameters of 850 mm minimum and the outputs 10 of the secondary fluid have passage diameters of 1 m minimum.
  • the assembly 1 is dimensioned for example for a pressure of about 50 bars of the primary fluid, a flow rate of about 200 kg / s of the primary fluid, a flow rate of about 600 kg / s of the secondary fluid, and a difference of pressure between the primary and secondary fluids of about 5 bar in normal operation.
  • the primary fluid enters the assembly 1 through the inlet 4, passes into the pipe 174, into the lower inlet manifold 170 and into the central manifold 14. It is distributed from this central manifold 14 to the different heat exchangers 12 distributed around the central collector, which it passes radially to the annular collector 16, yielding part of its heat to the secondary fluid.
  • the primary fluid then flows down along the annular collector 16, its lower section 86, passes through the openings of the perforated ferrule 122, then flows around the lower section 116 of the central collector 14, then between the collector lower 170 and the lower collector 172.
  • the primary fluid then passes through the openings 186 of the shell 180, is sucked by the fan 28 and discharged radially down the tank 30. It then passes through the openings 190 of the frustoconical ferrule 188 and leaves the assembly 1 by the outlet 6 formed around the inlet 4.
  • the secondary fluid enters the assembly 1 through the inlets 8, flows through the cuffs 158 and 160 to the inlet chamber 22, and is distributed, from the inlet chamber 22, in the different collectors
  • the secondary fluid passes through the exchangers 12 circumferentially and is collected in the axial outlet manifolds 20. It follows the collectors 20 axially to the outlet chamber 24, and is then distributed from the chamber 24 in the different exits 10.
  • the lid 34 of the external enclosure 2 is first removed. Then the operator opens the hatch 92 and gains the inspection channel 88. If the repair is to be carried out on one side of a 12-way exchanger towards an axial outlet channel 20, the operator passes through the opening 163 ( figure 2 ), enters the outlet chamber 24, and descends into the appropriate axial outlet manifold from the chamber 24.
  • the operator enters the annular manifold 16 from the chamber 24, via the axial outlet channel 20 having a manhole, and performs the repair to from the collector 16.
  • the operator opens the hatch 90 and passes from the inspection channel 88 to the central collector 14. It performs the repair from the central collector 14.
  • a maintenance cell 200 ( figure 13 ) is provided above the cell 197 in which is located the assembly 1.
  • the two cells communicate through an opening 202 closed by a mobile isolation trap 203 arranged above the assembly 1.
  • a sealing ring 204 is placed around the upper part of the assembly 1. Seals ensure the seal between the ring 204 and the flange 44 of the tank 30, on the one hand, and between the ring 204 and the peripheral edge of the flap 202.
  • a vinyl sock 206 is disposed above the sealing ring 204, and is suspended from the lifter of the bridge 201 of the cell 200.
  • the cover 34 of the enclosure 2 is first removed by means of the bridge 201.
  • the enclosure 2 is then isolated from the maintenance cell 200 by putting in place the trap 203 during the evacuation of the cover 34.
  • replacement of the vinyl sleeve 206 and opening of the hatch 203 the operators enter the outlet chamber 24 through the hatch 92 and the opening 163. They remove the insulation blocks 156 protecting the cuffs 140 and 142, then remove the screws 146 and 150 using suitable tools. Once the cuffs 140 and 142 have been released, the operators pull these cuffs (with specific tools) inside the outlet chamber 24. They thus proceed for the four secondary fluid outlets 10.
  • the rudder of the bridge 201 then mates with the mushroom 102 of the subassembly 94.
  • This subassembly is then lifted by raising the rudder of the bridge 201, out of the tank 30 and lifted through the flap 202 to the 200 cell. It is then inside the vinyl sock 206, isolation of the enclosure 1 by closing the hatch of 202.
  • the overhead crane then moves inside the maintenance cell 200, to come deposit the subassembly 94 in a suitable receiving stool. The heavy maintenance operations are performed in this cell 200.
  • the subassembly 94 must be guided in rotation about the X axis when it is put back in place, so that the indexing keys 130 engage in the appropriate grooves 132.
  • the maintenance cell 200 may be common to several sets 1, serving the same nuclear reactor, or serving several different nuclear reactors.
  • the axial collectors 18 and 20 open into the inlet and outlet chambers 22 and 24 and are not mechanically connected directly to the inputs and outputs 8 and 10 of the secondary fluid.
  • This configuration is favorable vis-à-vis the differential expansions between the outlets 8 and 10 connected to the tank and the chambers 22 and 24 belonging to the subset of the exchanger 94 thus significantly limiting the thermomechanical stresses of these connections.
  • the arrangement of the exchangers 12 and the axial inlet and outlet manifolds 18 and 20 makes it possible to give these collectors 18 and 20 a large passage section.
  • the axial circulation velocity of the secondary fluid along these collectors is for example between 10 and 20 m / s. In other exchanger concepts, these speeds reached 60 m / s. These reduced speeds are favorable for maintaining a hydraulic balance between the inputs and the outputs 64 and 66 of the secondary fluid of each module 56, in normal operation. These reduced speeds also allow a distribution of the uniform secondary fluid to the different modules 56 stacked along the same axial collector 18, and are favorable, from a thermo-hydraulic point of view, in transient operation. The overall efficiency of the exchangers 12 is improved.
  • thermomechanical behavior of the collectors is also particularly favorable.
  • the axial collectors 18 and 20 are delimited by inner circumferential plates 80 and outer 82 flexible, easily deformed under the effect of the constraints imposed by the exchangers 12.
  • the exchangers 12 are in fact high rigidity blocks compared to the plates 80 and 82, which impose their deformation to these sheets.
  • the sheets 80 and 82 are thin shells, large radii of curvature, which gives them great flexibility.
  • the entry and exit chambers 22 and 24 are large in size and not internally partitioned. As a result, the inlet chamber allows a distribution of the uniform secondary fluid in the different axial inlet manifolds 18. Moreover, because of their large passage sections, these chambers offer little resistance to the circulation of the secondary fluid. . They also make it easy to access the inputs 8 and the outputs 10, and thus to easily and quickly disconnect the cuffs 140, 142, 158 and 160 of the inputs 8 and the outputs 10.
  • the fact that the chambers are devoid of internal partitioning makes it possible to have the inputs 8 and the outlets 10 on one and the same side of the enclosure 2.
  • the subassembly 94 which contains all the exchangers and the main primary and secondary fluid flow collectors, can be removed in one piece from the outer enclosure 2. This operation is carried out in a particularly simple manner and convenient, using the bridge of the maintenance cell located above the heat exchanger assembly 1, after evacuation of the cover 34 and retraction of the sleeves 40 and 42 inside the inlet chambers 22 and 24. The retraction of the sleeves 40 and 42 is achieved using tools adapted quickly and easily, so that the doses integrated by the operators are low.
  • the lower manifolds 170 and 172 have flanges 176 of a shape adapted to guide the lower portion of the subassembly 94 when it is put back in place.
  • the sealed connection of the central collector 14 and the annular collector 16 with the lower collectors 170 and 172 is by simple interlocking in a vertical direction.
  • the heavy maintenance operations on the exchangers 12 are conveniently carried out in a special maintenance cell equipped with the appropriate equipment.
  • each exchanger 12 The modules 56 constituting each exchanger 12 are welded to each other along the edges delimiting, upwards and downwards, the inner, outer and radial faces of these modules.
  • the fillet welds are eliminated because of the presence of the bars 68 arranged in the machined angles of the modules 56.
  • the inner and outer circumferential plates 80 and 82 are welded to the flanges 72 of the bars 68. This weld is located at a distance from the modules 56 and can be conveniently controlled by radiography.
  • the critical zone C (see FIGS. 9A and 9B) in which the thermomechanical stresses are maximum is situated at the junction between the wing 72 and the main part 70 of the bar 68, and therefore extends into the mass of the bar 68. and not at the level of the weld.
  • the wing 72 is connected to the radial faces of the modules 56 by a radius of curvature (R) optimized according to the thermomechanical stresses in the critical zone C.
  • the heat exchange assembly described above can have multiple variants.
  • the exchangers 12 may not be plate type, but for example be heat exchangers tube and calender.
  • the fan 28 may not be arranged on the bottom of the tank 30, but rather be fixed to the cover 34. It is in this case necessary to modify the circulation of the primary fluid leaving the heat exchangers 12.
  • the annular collector 16 is extended upwardly to the fan 28 and is partitioned to define an upward portion channeling the primary fluid to the blower 28 and a downward portion channeling the primary fluid from the blower 28 to the outlet 6.
  • the evacuation of the subassembly 94 is more complex in this case, since it is necessary to disassemble the fan 28 before removing the cover 34 from the enclosure 2.
  • the heat exchange assembly may comprise more or fewer than eight heat exchangers 12.
  • the secondary fluid inlets 8 may be disposed at the top of the upper shell 36, the secondary fluid outlets 10 being, in this case, disposed below the heat exchangers 12.
  • the primary fluid can flow from the inlet 4 to the heat exchangers 12 in the annular collector 16, and return the exchangers to the outlet 6 through the central collector.
  • the primary fluid can flow from the inlet chamber 22 through the axial channels 18 and 20 to the outlet chamber 24, the secondary fluid circulating, in this case, in the central collector 14 and in the annular collector 16.
  • the primary fluid may not be substantially pure helium, but may be a mixture of helium and nitrogen.
  • the primary fluid may also comprise mainly water.
  • the secondary fluid may be substantially pure helium or a mixture of helium and nitrogen (for example 20% helium and 80% nitrogen or 40% helium and 60% nitrogen).
  • the secondary fluid may also be mainly water, and vaporized in the heat exchange assembly.
  • the heat exchange assembly acts as a steam generator.
  • heat exchange assembly 1 has several original aspects that can be protected independently of one another.
  • the assembly 1 comprises a mechanical subassembly extractable in one piece such as 94, while the axial manifolds 18 and 20 are connected to the inputs 8 and 10 outlets by connecting pipes and not by means of chambers such as 22 and 24.
  • the terminal parts of the connecting pipes are capable of being disassembled manually inputs and outputs 8 and 10, for example from the free space between the cover 34 and the exchangers 12, and from the free space between the frustoconical casing 100 and the exchangers 12. These end parts are retracted inside the connection pipes, or completely separated from them and outlets manually from the enclosure 2 by the operators.
  • the assembly 1 comprises exchangers 12 provided with bars 68 such as those described above while the axial collectors 18 and 20 are not connected to the inputs 8 and outputs 10 by chambers 22 and 24 and / or that the assembly 1 does not include removable subassembly 94.

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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)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Details Of Heat-Exchange And Heat-Transfer (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
EP06778635A 2005-06-27 2006-06-22 Ensemble d'echange de chaleur, notamment pour reacteur nucleaire a haute temperature Not-in-force EP1902266B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0506512A FR2887618B1 (fr) 2005-06-27 2005-06-27 Ensemble d'echange de chaleur, notamment pour reacteur nucleaire
PCT/FR2006/001430 WO2007000507A1 (fr) 2005-06-27 2006-06-22 Ensemble d'echange de chaleur, notamment pour reacteur nucleaire a haute temperature

Publications (2)

Publication Number Publication Date
EP1902266A1 EP1902266A1 (fr) 2008-03-26
EP1902266B1 true EP1902266B1 (fr) 2008-11-05

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EP06778635A Not-in-force EP1902266B1 (fr) 2005-06-27 2006-06-22 Ensemble d'echange de chaleur, notamment pour reacteur nucleaire a haute temperature

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US (1) US8081729B2 (xx)
EP (1) EP1902266B1 (xx)
JP (1) JP4714267B2 (xx)
KR (1) KR101329537B1 (xx)
CN (1) CN100559108C (xx)
AT (1) ATE413577T1 (xx)
DE (1) DE602006003562D1 (xx)
FR (1) FR2887618B1 (xx)
RU (1) RU2414661C2 (xx)
WO (1) WO2007000507A1 (xx)
ZA (1) ZA200710875B (xx)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2898404B1 (fr) * 2006-03-13 2008-09-05 Areva Np Sas Ensemble d'echange de chaleur entre un premier et un second fluides.
KR101072329B1 (ko) * 2009-11-11 2011-10-11 현대자동차주식회사 열교환기
US11504814B2 (en) 2011-04-25 2022-11-22 Holtec International Air cooled condenser and related methods
US9786395B2 (en) * 2011-04-25 2017-10-10 Holtec International, Inc. Air-cooled heat exchanger and system and method of using the same to remove waste thermal energy from radioactive materials
WO2014089072A2 (en) 2012-12-03 2014-06-12 Holtec International, Inc. Brazing compositions and uses thereof
FR3009862B1 (fr) 2013-08-26 2015-09-11 Commissariat Energie Atomique Echangeur de chaleur entre deux fluides, utilisation de l'echangeur avec du metal liquide et du gaz, application a un reacteur nucleaire a neutrons rapides refroidi avec du metal liquide
KR101525041B1 (ko) * 2013-11-19 2015-06-10 한국원자력연구원 수소생산용 초고온 가스로 중간열교환기
DE112014005907T5 (de) * 2013-12-19 2016-09-08 Dana Canada Corporation Konischer Wärmetauscher
AU2018275482B2 (en) 2017-05-30 2020-12-24 Shell Internationale Research Maatschappij B.V. Method of using an indirect heat exchanger and facility for processing liquefied natural gas comprising such heat exchanger
CN110530174B (zh) * 2019-07-16 2020-10-13 武汉科技大学 一种基于自激振荡腔室的纵列管式环流换热器
RU2725068C1 (ru) * 2019-09-23 2020-06-29 Общество с ограниченной ответственностью "Полесье" (ООО "Полесье") Теплообменник
RU2725120C1 (ru) * 2019-09-23 2020-06-29 Общество с ограниченной ответственностью "Полесье" (ООО "Полесье") Теплообменник
RU2744607C1 (ru) * 2020-07-20 2021-03-11 Акционерное общество "Конструкторское бюро химавтоматики" Установка для получения горячей воды и пара с использованием водородного парогенератора
KR102484646B1 (ko) * 2021-02-23 2023-01-04 한국원자력연구원 인쇄기판형 증기발생기 및 이를 구비하는 원전
CN114633085B (zh) * 2022-03-15 2024-01-30 浙江嘉诚动能科技股份有限公司 一种核电用大型蒸发器内件安装方法
KR102679719B1 (ko) * 2022-04-26 2024-06-28 한국전력기술 주식회사 판형열교환기를 이용한 다단식 적층형 증기발생기

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US4098329A (en) * 1976-07-29 1978-07-04 The United States Of America As Represented By The United States Department Of Energy Modular heat exchanger
US5267281A (en) * 1991-11-08 1993-11-30 Westinghouse Electric Corp. Heat exchanger and water tank arrangement for passive cooling system
ATE171649T1 (de) * 1993-07-05 1998-10-15 Packinox Sa Verfahren und vorrichtung zur regulierung der temperaturen von reaktionen
FR2793875B1 (fr) * 1999-05-19 2001-08-03 Packinox Sa Echangeur thermique a plaques
JP2002090078A (ja) * 2000-09-18 2002-03-27 Sumitomo Precision Prod Co Ltd 高温用プレートフィン型熱交換器
JP3810728B2 (ja) * 2002-10-25 2006-08-16 三菱重工業株式会社 積層型熱交換器
JP4239077B2 (ja) * 2003-08-20 2009-03-18 独立行政法人 日本原子力研究開発機構 高温耐食性セラミックス製コンパクト熱交換器

Also Published As

Publication number Publication date
FR2887618B1 (fr) 2007-09-14
DE602006003562D1 (de) 2008-12-18
US20100038062A1 (en) 2010-02-18
RU2414661C2 (ru) 2011-03-20
KR101329537B1 (ko) 2013-11-18
CN100559108C (zh) 2009-11-11
ZA200710875B (en) 2008-12-31
JP4714267B2 (ja) 2011-06-29
WO2007000507A1 (fr) 2007-01-04
RU2008102989A (ru) 2009-08-10
KR20080025694A (ko) 2008-03-21
CN101208577A (zh) 2008-06-25
US8081729B2 (en) 2011-12-20
JP2008546985A (ja) 2008-12-25
EP1902266A1 (fr) 2008-03-26
ATE413577T1 (de) 2008-11-15
FR2887618A1 (fr) 2006-12-29

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