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
  • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
  • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
  • F28F21/081—Heat exchange elements made from metals or metal alloys
  • F28F21/087—Heat exchange elements made from metals or metal alloys from nickel or nickel alloys
• • 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
  • F28D9/0062—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 spaced plates with inserted elements
  • F28D9/0068—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 spaced plates with inserted elements with means for changing flow direction of one heat exchange medium, e.g. using deflecting zones
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
  • F28F13/14—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by endowing the walls of conduits with zones of different degrees of conduction of heat
• • 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
  • F28F2255/04—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes comprising shape memory alloys or bimetallic elements

Definitions

• the present invention relates to a plate of a bundle of heat exchange plates.
• the present invention also relates to methods of manufacturing such a plate and a bundle of heat exchange plates.
• the number of tube bundles is often from four to six and sometimes more.
• the chemical composition of fluids can vary during heat exchange taking into account temperature variations and it is necessary to adapt the materials of the tubes of the tube bundles according to these changes in order to avoid phenomena of corrosion can occur both at low temperatures and at high temperatures.
• the so-called "cold" tubular bundles comprise tubes for example made of carbon steel and the tubular bundles operating at high temperatures of the order of 400 to 500 ° C. comprise tubes for example stainless steel.
• This type of heat exchanger generally comprises bundles of plates formed by a stack of plates parallel to each other and delimiting between them a double circulation circuit of two independent fluids.
• Each plate is made of a single material which is determined according to the most severe conditions of use so as to be able to withstand high temperatures.
• the plates of the plate bundles are generally made of stainless steel, which penalizes the use of such plate bundles in certain fields of application, given the cost of this material.
• plate heat exchangers are more expensive than tube bundle heat exchangers so that their economic interest is only justified if all the bundles of tubes are replaced by a single plate heat exchanger.
• the invention aims to avoid these drawbacks.
• the subject of the invention is therefore a plate of a bundle of heat exchange plates, of the type comprising a central part provided with corrugations and edges with a smooth surface, characterized in that it is formed by at least two portions of metal plate of different metallurgical compositions, placed edge to edge to form at least one joint plane and connected together by a continuous and sealed weld bead extending over the entire length of said joint plane.
• the portions of metal plates have at their joint plane a smooth surface edge on which is fixed at least one insert covering said joint plane and comprising corrugations arranged in the extension of the corrugations of said plate portions to form continuous passages , the joint plane extends over the entire width of said plate or over the entire length of this plate,
• the weld bead is of the through type and is produced by means of a high energy density beam or by the TIG process with or without filler metal or by the MIG or MAG process,
• metal plate is made of stainless steel, the chromium content of which is greater than 13%, - at least one portion of metal plate is made of alloyed or unalloyed steel,
• metal plate is made of nickel alloy.
• the subject of the invention is also a method of manufacturing such a plate from a bundle of heat exchange plates, characterized in that it consists:
• the subject of the invention is a method of manufacturing such a plate from a bundle of heat exchange plates, characterized in that it consists:
• the subject of the invention is a method of manufacturing such a plate from a bundle of heat exchange plates, characterized in that it consists:
• the subject of the invention is a bundle of heat exchange plates formed by a stack of plates each comprising a central part provided with corrugations and edges with a smooth surface and delimiting between them at least two circulation circuits of at least two independent fluids, said plates comprising, on the one hand, a heat exchange zone between the fluids and, on the other hand, at their free ends, an inlet and outlet area for said fluids, characterized in that it comprises at least one plate as mentioned above.
• the fluid inlet and outlet areas are formed by the planar ends of the plates between which are inserted independent plates and provided with reliefs to ensure the distribution of fluids in the heat exchange zone,
• the independent plates are made of stainless steel with a chromium content of more than 13%, or of alloyed or unalloyed steel or of nickel alloy.
• Fig. 1 is a schematic perspective view partially cut away of a bundle of plates according to the invention
• FIG. 2 is a schematic top view of a first embodiment of a heat exchange plate according to the invention
• FIG. 2 is a cross-sectional view along line 3-3 of FIG. 2,
• FIG. 4 is a schematic top view of a second embodiment of a heat exchange plate according to the invention.
• FIG. 5 is a sectional view along line 4-4 of FIG. 4,
• FIG. 6 is a schematic perspective view of an insert for connecting the plate portions making up the plate shown in FIG. 4,
• FIG. 7 is a schematic perspective view of a variant of a heat exchange plate according to the invention.
• Fig.l there is shown schematically a bundle of heat exchange plates, generally designated by the reference 1 and of generally parallelepipedal shape.
• the bundle of plates 1 is made up of three parts, a central part A and two end parts, respectively B and C.
• the central part A which constitutes the actual heat exchange zone consists of a stack of plates 10 parallel to each other.
• Each plate 10 consists of a thin sheet and comprises, in a conventional manner, edges with a smooth surface and, between these edges, undulations 11 by which they are in contact with each other and by which they delimit circuits of circulation of independent fluids.
• the circulation of the fluids in the bundle of plates 1 is for example cocurrent, counter-current or cross-current.
• the plates 10 are joined together with the au- very at their longitudinal edges by connecting means constituted for example by bars 2 extending over the entire length of the longitudinal edges of said plates 10 and by a layer of weld 3 deposited over the entire length and over the entire height of each lateral surface of the bundle of plates 1 to form a sealed weld wall.
• connecting means constituted for example by bars 2 extending over the entire length of the longitudinal edges of said plates 10 and by a layer of weld 3 deposited over the entire length and over the entire height of each lateral surface of the bundle of plates 1 to form a sealed weld wall.
• the stack of plates 10 is placed between an upper plate 4 and a lower plate 5 extending over the entire surface of the plates 10 and the edges of which are connected to the edges of said plates 10 by the layers of solder 3.
• this bundle of plates 1 comprises, at each of its ends, an inlet zone and an outlet zone of said fluids which constitute the end parts B and C of said bundle of plates 1.
• the bundle of plates 1 comprises, at the inlet and outlet areas of the fluids, closed ends 6 and open ends 7 for these fluids circulating in the corresponding circuits.
• the closed ends ⁇ are closed by tongues 8 assembled to the adjacent plates 10.
• a first embodiment of a plate 10 of the bundle of plates 1 will be described.
• the plate 10 is formed, in this embodiment, by two portions of metal plate, respectively 12 and 13, of different metallurgical compositions. These plate portions 12 and 13 are placed edge to edge to form a joint plane 14 and are interconnected by a continuous and sealed weld bead 15 extending over the entire length of this joint plane 14.
• the corrugations 11 of each portion of metal plate 12 and 13 extend to the joint plane 14 to form continuous passages for the corresponding fluids.
• the joint plane 14 extends over the entire width of the plate 10. According to a variant, and more particularly in the case of a flow of cross-current fluids, the joint plane 14 can extend over the entire plate length 10.
• the ends of the plate 10 corresponding to the inlet and outlet zones of the fluids are provided with end plates, respectively 30 and 31, provided with reliefs 30a and 31a which make it possible to channel the corresponding fluid in the circuits of the bundle of plates 1.
• the manufacture of the plate 10 is carried out as follows.
• the two portions of metal plate 12 and 13 planes of different metallurgical compositions are placed edge to edge to form the joint plane 14, then said portions of plates 12 and 13 are maintained by conventional clamping members. , such as hydraulic or pneumatic cylinders, and we carry out on any the length of the joint plane 14 the weld bead 15 continuous and sealed.
• the corrugations 11 are formed, for example by explosion forming.
• the plate 10 is also formed by two portions of metal plate, respectively 22 and 23, of compositions different metallurgicals.
• These metal plate portions 22 and 23 are placed edge to edge to form a joint plane 14 and are interconnected by a continuous and sealed weld bead 15 extending over the entire length of said joint plane.
• the metal plate portions 22 and 23 comprise at the joint plane 14 an edge with a smooth surface, respectively 22a and 22b.
• the joint plane 14 extends over the entire width of the plate 10.
• the joint plane 14 can extend over the entire length of the plate 10.
• the ends of the plate 10 corresponding to the inlet and outlet areas of the fluids are provided with end plates, respectively 30 and 31, provided with reliefs 30a and 31a which make it possible to orient the corresponding fluid in the circuits of the beam of plates 1.
• an insert 25 is fixed at this joint plane 14 and on the corresponding face of the plate
• this insert 25 has corrugations 26 which are arranged in the extension of the corrugations 11 of the plate portions 22 and 23 to form continuous passages for the corresponding fluid.
• This insert 25 is fixed to the plate 10 by any suitable method.
• the manufacture of the plate 10 shown in Figures 4 and 5 is carried out as follows.
• the corrugations 11 are formed, for example by explosion, in the central part of the first portion of flat metal plate 22, by providing edges with a smooth surface on the edges of this plate portion 22 and forms, for example by explosion, in the central part of the second portion of flat metal plate 23 of the corrugations 11 by providing on the edges of this second portion of plate 23 edges with a smooth surface.
• the plate portions 22 and 23 each have a different metallurgical composition.
• the plate portions 22 and 23 are placed edge to edge to form the joint plane 14 and these plate portions 22 and 23 are held in position using conventional clamping means, such as, for example, hydraulic jacks or tires.
• the weld bead 15 is produced over the entire length of this joint plane 14 and at least one insert 25 is fixed at this joint plane by placing the corrugations 26 of said insert 25 in the extension of the corrugations 11 of the portions plate 22 and 23 to form continuous passages.
• the manufacture of the plate 10 formed from the plate portions 22 and 23 is carried out as follows.
• the two flat metal plate portions 22 and 23 of compositions are placed side by side. different metallurgicals to form the joint plane 14, then the plate portions 22 and 23 are kept in position using conventional clamping means, such as for example hydraulic or pneumatic cylinders, and the entire length of this plane is produced seal 14 the weld bead 15.
• the corrugations 11 are formed, for example by explosion, in the central part of each plate portion 22 and 23, by providing edges with smooth surfaces on the edges of these plate portions 22 and 23.
• At least one insert 25 is fixed at the joint plane 14 and on the face of the plate portions 22 and 23 provided with the corrugations 11, by arranging the corrugations 26 of this insert 25 in the extension of the corrugations 11 of said plate portions 22 and 23 to form continuous passages for the corresponding fluid.
• the weld bead 15 is of the through type and is produced by means of a high energy density beam or by the TIG process with or without filler metal or by the MIG or MAG process.
• the plate portions 12, 13 and 22, 23 are of different metallurgical compositions and, for example, a plate portion is made of stainless steel whose chromium content is greater than 13% while the other plate portion is made of alloyed or unalloyed steel or nickel alloy.
• the metallurgical composition of the plate portions 11, 12 and 22, 23 is determined as a function of the heat exchange coefficient and / or as a function of the temperature of the fluids and / or of the nature of these fluids circulating in the beam of plates 1.
• the plate 10 may comprise, at the cold part, a portion of plate made of alloyed or unalloyed steel which has good resistance to corrosion and, in the hot part, a portion of plate made of stainless steel which has good mechanical strength.
• the plate 10 comprises two portions of plates.
• the plate 10 can comprise more than two plate portions.
• a variant of a heat exchange plate 10 has been shown.
• the plate 10 is formed by two portions of metal plate
• the inlet and outlet zones for the fluids are formed by the planar ends of the plates 10 between which are inserted independent plates 35 provided with reliefs to ensure the distribution of the fluids in the heat exchange zone .
• the independent plates 35 have the same metallurgical composition as the plate portions 12 and 13 or a different metallurgical composition.
• the independent plates 35 are made of stainless steel whose chromium content is greater than 13% or of alloyed or unalloyed steel or else of nickel alloy.
• the metallurgical composition of the independent plates 35 is determined as a function of the heat exchange coefficient and / or as a function of the temperature of the fluids and / or of the nature of the fluids.
• the bundle of plates according to the invention makes it possible to be able to carry out a significant heat exchange between a hot fluid and a cold fluid whose temperature variations on this cold fluid can reach 300 to 400 ° C.

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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)

Applications Claiming Priority (3)

Publications (1)

Family

ID=9511573

Family Applications (1)

Country Status (4)

Families Citing this family (8)

Family Cites Families (8)

• 1997
  • 1997-09-29 FR FR9712078A patent/FR2769082B1/fr not_active Expired - Lifetime
• 1998
  • 1998-09-23 WO PCT/FR1998/002050 patent/WO1999017070A1/fr not_active Application Discontinuation
  • 1998-09-23 EP EP98946508A patent/EP1019665A1/fr not_active Withdrawn
  • 1998-09-23 JP JP2000514096A patent/JP2001518602A/ja not_active Withdrawn

Non-Patent Citations (1)

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