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
  • 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
  • F28D9/0031—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 conduits for one heat-exchange medium being formed by paired plates touching each other
  • F28D9/0037—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 conduits for one heat-exchange medium being formed by paired plates touching each other the conduits for the other heat-exchange medium also being formed by paired plates touching each other
• • 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
  • 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
  • F28F2250/104—Particular pattern of flow of the heat exchange media with parallel flow

Definitions

• the present invention relates to the design of plate type heat exchangers. They are generally distinguished from tubular exchangers by the fact that the fluids in a heat exchange situation circulate longitudinally on either side of corrugated plates arranged parallel to one another so as to rest on each other. others by ridges of their respective undulations.
• exchangers of this type include a bundle of parallel flat plates which are made of thin sheets , most often made of stainless steel, provided with corrugations by which they are in contact with one another and by which they organize the circulation of fluids longitudinally from one end to the other of the exchanger (in general against -current one of 1'autre), creating turbulence favorable to the heat exchanges which take place between the fluids through each plate.
• the plates are welded together by means of tongues or frames forming spacers which maintain the spacing between two successive joint plates.
• the stack of plates is framed by two relatively thick sheets, which transfer the weight of the beam onto a support.
• the tongues are placed continuously along the flat lateral edges of the plates. Their thickness balances that of the corrugations by which the thin sheets constituting the plates rest on each other, while providing circulation channels for an exchange fluid between two successive plates.
• Such an embodiment of the beam is particularly difficult to implement.
• the welding operation relates to substantially different thicknesses of material to be welded, between the tongues and the thin sheets, this leads to stresses and cracks due to differences in thermal inertia.
• the present invention aims in particular to design an easier production beam which is lighter and which overcomes the above drawbacks. It is situated in a usual technological context, where this beam is placed in an enclosure suitable for receiving and containing that of the fluids with the highest pressure.
• the present invention is characterized in that it consists of a stack of pairs of plates provided with corrugations and joined in pairs by welding by their respective lateral edges, thus providing closed passage channels for a first heat exchange fluid longitudinally from one end to the other of the bundle, the intervals between two pairs of neighboring plates, in contact by external ridges of the corrugations of the plates alternately providing open passage channels for a second fluid d heat exchange, the latter being preferably allowed to fill an enclosure containing the bundle.
• the invention makes it possible to eliminate the intermediate tongues between plates on the lateral edges, whereby this not only leads to a noticeable reduction in the overall weight of the beam, but above all, the consequences of welding operations relating to thicknesses are avoided. of materials to be welded substantially different, between the tongues and the thin sheets, where tensions and cracks due to the differences of thermal inertia.
• a first welding step consists in welding two by two the lateral edges of the plates, pressed against each other, preferably without filler metal. Each pair of two plates thus forms a fluid passage channel, longitudinally from one end to the other of the bundle.
• the present invention also relates to the production of a plate-type heat exchanger comprising a pressure resistance enclosure in which the bundle of heat exchange plates is placed.
• the exchanger according to the invention then advantageously comprises means for supplying and evacuating the heat exchange fluids between the outside of the enclosure and the ends of the bundle, at the level of intermediate tabs which join the plates while sparing inputs and outputs for said fluids.
• these supply and evacuation means are preferably arranged so that the second fluid flowing in the open passage channels fills the enclosure.
• This second fluid will preferably be the fluid at higher pressure, so that it is not necessary to provide elements for taking up pressure forces on the bundle, the holding of the stack being ensured by the fluid at higher pressure filling the enclosure, preferably upstream of the pressure drop which it undergoes when crossing the beam.
• Such an embodiment which does not require the welding operation of the entire beam on its lateral edges, also allows in a variant to embodiment, to ensure better filling in volume of the enclosure, generally cylindrical, by authorizing the production of a bundle of plates from pairs of plates of different widths. A better exchange capacity of the exchanger is therefore obtained for a given size.
• the latter is advantageously surrounded by a substantially parallelepipedal box open at its two longitudinal ends.
• this box is of particularly simple constitution, insofar as it does not need to ensure a resumption of pressure forces.
• the second higher pressure fluid circulating in the open channels and in the volume of the enclosure makes it possible to avoid elements for taking up these forces.
• the box is replaced by two plates constituting side panels of length identical to the length of the plates and of width somewhat greater than the height of the stack.
• the beam will be placed directly in the enclosure and the stack will be maintained once the pressurization has been carried out by the second higher fluid pressure.
• the latter advantageously comprises at its longitudinal ends, intermediate tabs which, to determine access passages for fluids at the inlet and at the beam exit, are placed so that the laterally closed passage channels are open at the ends in the central part and the open channels for the second fluid between two adjoining pairs of two laterally welded plates are on the contrary closed by tabs in the same central area.
• tabs closing the closed passage channels while the passage channels for the first fluid remain open.
• the tongues intended to close each closed passage channel in the lateral zones be cut at a bevel at their end opposite the lateral edges of the plates, in order to allow their welding to be easily connected to the watertight welding of the corresponding channel. .
• the means for supplying and evacuating the first fluid between the exterior of the enclosure and the ends of the bundle advantageously comprise, according to the invention, at each longitudinal end of the bundle, an internal collector circuit consisting of a connection box internal, welded by its longitudinal edges on the overlapping area of the lateral and central tabs and by its transverse edges on the external plates of the stack, and an internal conduit ensuring the connection between the connection box and the outside of The enclosure by crossing the latter.
• the means for discharging the second exchange fluid advantageously comprise an external collector circuit, consisting of an external connection box, welded by its edges to the end of the box, and an external conduit coaxial with the internal conduit of the collector internal constituting the means for supplying the first fluid, ensuring the connection between the external box and the outside of the enclosure.
• connection boxes are preferably made in the form of half-cylinders, the inlet box for the first fluid being inside the outlet box for the second fluid.
• the means for supplying the second fluid may be produced in a similar manner to its means of evacuation, but they advantageously consist of a simple orifice in the enclosure, the second higher pressure fluid thus freely entering the bundle at the same time as it fills the enclosure, designed to withstand high pressure.
• the invention also relates to a method for producing a plate type exchanger consisting of:
• FIG. 2 shows in cross section a bundle of plates according to the invention, the section being made in the region of one of the longitudinal ends of the bundle;
• FIG. 3 shows a partial exploded perspective view of an exchanger according to the invention
• FIG. 4 schematically shows a cross section of an alternative embodiment of a heat exchanger according to the invention.
• FIG. 5 shows schematically and partially a perspective view of an exchanger according to the invention.
• a bundle 1 of heat exchange plates according to the invention as shown in Figures 1 and 2 consists of a stack of pairs 2 of plates 3, 3 '.
• Each pair 2 of plates 3, 3 ' is produced by superimposing two thin sheets constituting the plates 3, 3' bearing one on the other by internal ridges 4 of undulations which they comprise and which constitute their own means to organize the circulation of heat exchange fluids passing between two neighboring plates belonging to the same couple.
• the plates 3, 3 ′ furthermore comprise a frame with a smooth surface, devoid of undulations and allowing in particular that two plates 3, 3 'constituting a couple 2 are welded to each other by the respective lateral edges 5, 5' of the plates 3, 3 'pressed against each other, without metal of input.
• the pairs 2 of plates 3, 3 ′ thus produced constitute closed passage channels 6, longitudinally from one end to the other of the bundle 1, for a first heat exchange fluid.
• pairs 2 of plates 3, 3 ′ are then stacked on each other and the intervals between two pairs of neighboring plates, in contact with external ridges 7 of the undulations of their plates, provide open passage channels 8 for a second heat exchange fluid.
• the stack is then, in the example described, maintained in a simple rectangular box 9 open at both ends.
• the purpose of this box 9 is firstly to channel the second heat exchange fluid into the open channels 8, and secondly, secondarily, to keep the stack in place until it is pressurized in an enclosure 10 ( Figure 5), designed to withstand the pressure of fluids.
• the fluid flowing in the closed channels 6 will preferably be the fluid at lower pressure, or at least that which does not fill the enclosure, generally with a cylindrical shell, containing the bundle of plates.
• the higher pressure fluid thus circulating in the open channels 8 at the same time as it fills the enclosure 10 as will be seen later, this makes it possible to prevent the box 9 having to take up the efforts of pressure.
• tongues are put in place spacers 11, 12 (FIG. 2) which determine the passages of the fluid at the entry and exit of the bundle, where the passage channels 6, 8 connect to connection boxes 13, 14 (FIG. 3), so then carry out the welding of the end tongues 11, 12 and of the transverse edges 15, 15 'with smooth surface of the plates 3, 3' at the same time as that of internal connection boxes 13, 16 (FIG. 5) for the first fluid.
• the exchanger as shown in FIG. 5 is an exchanger where the entire bundle 1 is suspended from the enclosure 10 with a cylindrical shell by an external manifold 17 of the first low-pressure heat exchange fluid, passing to the head end of the exchanger inside an internal manifold 18 of the second high-pressure heat exchange fluid, while at the foot end, the second high-pressure fluid freely enters the bundle 1 at the same time that it fills the enclosure 10, designed to resist high pressure, and that the first low pressure fluid leaves the bundle 1 via an internal manifold 19.
• collectors 17, 18, 19 constitute means for supplying and evacuating the heat exchange fluids from the outside of the enclosure 10 towards the ends of the bundle.
• the internal collecting circuits 18 and 19 each consist of an internal connection box 13, 16 of generally semi-cylindrical shape, and of an internal conduit 20, 21 ensuring the connection between the connection box 18 or 19 and the outside the enclosure 10.
• the external collector circuit 17 consists of an external connection box 14 of generally semi-cylindrical shape and of an external conduit 22 ensuring the connection between the connection box 17 and outside the enclosure 10, the internal 20 and external 22 conduits being coaxial.
• the channels 6 which were closed laterally during the plate 3 on plate 3 'welding step are open at the ends in a central zone 23 and are closed in the two lateral zones 24 and 25 on either side of the zone central 23 by the tongues 11, both at the head and at the bottom of the bundle.
• the open channels 8 formed for the second fluid between two couples 2 joined to two plates 3, 3 'welded laterally are on the contrary closed by tongues 12 in the central zone 23 so as not to communicate with the internal collectors 18, 19.
• the welding of these tongues is therefore carried out on the transverse edges of the plates at the same time as the welding of the internal connection boxes 13, 16 on an overlap zone 30 of the tongues 11, 12 at the two edges of the central zone 23 and on the central zone of the transverse edges of the two external plates of the bundle 1.
• a final welding step consists in welding the external connection box 17 on the end of the box 9 surrounding the bundle.
• FIG. 4 shows the best filling by volume which can be obtained according to the invention in a cylindrical shell 26 constituting the enclosure of
• the exchanger In this case, a beam 27 of plates 28 of different widths.
• a stepped section of the bundle as shown is made possible by the realization of the bundle in the form of pairs of stacked plates between which the passage channels for the second fluid can remain open.
• the invention is in no way limited to the preferred embodiments given above by way of examples. On the contrary, it will be understood that it extends to many other variants.

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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)
• Separation By Low-Temperature Treatments (AREA)
• Fuel Cell (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=9416304

Family Applications (1)

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• 1991
  • 1991-08-21 FR FR9110473A patent/FR2680566B1/fr not_active Expired - Fee Related
• 1992
  • 1992-08-19 WO PCT/FR1992/000804 patent/WO1993004330A1/fr active IP Right Grant
  • 1992-08-19 DE DE69208072T patent/DE69208072T2/de not_active Expired - Fee Related
  • 1992-08-19 JP JP50415193A patent/JP3190675B2/ja not_active Expired - Lifetime
  • 1992-08-19 AT AT92918527T patent/ATE133781T1/de active
  • 1992-08-19 EP EP92918527A patent/EP0553340B1/de not_active Expired - Lifetime

Non-Patent Citations (1)

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