EP2884213B1 - Method for producing a plate heat exchanger - Google Patents
Method for producing a plate heat exchanger Download PDFInfo
- Publication number
- EP2884213B1 EP2884213B1 EP13197164.0A EP13197164A EP2884213B1 EP 2884213 B1 EP2884213 B1 EP 2884213B1 EP 13197164 A EP13197164 A EP 13197164A EP 2884213 B1 EP2884213 B1 EP 2884213B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heat exchanger
- plate
- plates
- gasket
- heat transfer
- 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.)
- Active
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 238000000576 coating method Methods 0.000 claims description 24
- 230000003373 anti-fouling effect Effects 0.000 claims description 21
- 239000011248 coating agent Substances 0.000 claims description 21
- 239000003566 sealing material Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 238000004140 cleaning Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000000748 compression moulding Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000003599 detergent Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229920001875 Ebonite Polymers 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 235000013365 dairy product Nutrition 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 150000003961 organosilicon compounds Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/08—Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning
- F28F3/083—Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning capable of being taken apart
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/08—Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning
- F28F3/10—Arrangements for sealing the margins
Definitions
- the invention relates to a method for producing a plate heat exchanger according to the preamble of claim 1.
- Plate heat exchangers provided with gaskets normally comprise a package of heat exchanger plates arranged adjacent to one another. Gaskets are disposed between the heat exchanger plates, or the plates may also be permanently joined together in pairs to form so-called cassettes, e.g. by welding, with gaskets placed between the respective cassettes. The gaskets are accommodated in gasket grooves formed during the form-pressing of the heat exchanger plates. Plate heat exchangers further comprise inlet and outlet ports, which extend through the plate package, for two or more media.
- Heat exchanger plates are normally made by form-pressing of sheet metal and are arranged in the plate package in such a way as to form first plate intermediate spaces which communicate with the first inlet port and the first outlet port, and second plate intermediate spaces which communicate with the second inlet port and the second outlet port.
- the first and second plate intermediate spaces are disposed alternately in the plate package.
- a heat exchanger plate for a plate heat exchanger normally includes a heat transfer area and a border area, which is located outside the heat transfer area and which extends along and delimits the heat transfer area. Such a heat exchanger plate further has a number of open portholes. The heat exchanger plates are kept together to a plate package by means of tie bolts.
- the gaskets which are used between the heat exchanger plates in the plate heat exchanger, are manufactured separately, for instance by compression moulding or injection moulding.
- the gaskets are usually manufactured in any relatively hard rubber material such as nitrile; EFDM or fluorine rubber.
- the gasket may be attached to the heat exchanger plate by gluing.
- the gasket may also include various guide members, for instance so called T-tabs, which extend outwardly from the gasket and which are pressed to attachment in corresponding grooves in the heat exchanger plate.
- Plate heat exchangers are used in many applications where the object is to transfer heat to or from a media having a tendency to stick to a surface, e g dairy products. Over time the plates of the plate heat exchangers in use may get fouled by deposits arising e g from the fluids in the equipment, microbial growth and/or dirt, which leads to a decreased heat transfer and increased pressure drop. This results in an overall reduced performance of the heat exchanger. Eventually, it will be necessary to open the plate heat exchanger and clean the heat exchanger plates. Depending on the fluids used in the heat exchanger, the plates may be seriously fouled and difficult to clean, requiring strong detergents and/or powerful mechanical cleaning over a substantial time period in order to restore the performance of the heat exchanger. The cleaning of the plates may both be time consuming and costly. Also, the process system in which the plate heat exchanger is installed may have to be shut down during said cleaning of the plate heat exchanger.
- the plates of heat exchangers are predominantly made of metal sheets.
- the base material i.e. metals used, have a high surface free energy resulting in that most liquids easily wet the surface of the sheets.
- the forming operation of sheet metal increases the surface roughness which often is associated with faster build-up of fouling deposits.
- anti-fouling coatings are used in order to prevent media from adhering to the surface of the plates and to keep the heat exchangers running for longer time periods. Anti-fouling coatings further provides for easier cleaning and a reduced shut down time for processes where plate heat exchangers are involved.
- WO 2012/018296 describes plates for a gasketed plate heat exchanger being coated with a sol-gel composition which results in plates with reduced fouling of the plate when in use in a heat exchanger.
- a coating composition comprising sol-gel material with organosilicon compounds to the heat exchanger plate both the surface free energy and roughness is lowered, leading to reduction of fouling and easy cleaning of heat exchanger plates.
- a problem encountered with presently known plate heat exchangers provided with antifouling coatings is the phenomenon of "snakeing", i e a phenomenon wherein the plates of the plate package slide when they are assembled or a short period after they are assembled. This problem is related to the non-sticking surface properties of anti-fouling coated plates and to the lack of or low friction between the anti-fouling surface in the gasket groove and the gasket. Furthermore, cracks in the coating may occur due to torque and tension forces acting on the plates when the plate package is exhibiting snakeing.
- Another objective is to provide a method for producing a plate heat exchanger provided with an antifouling coating wherein the phenomenon of "snakeing" has been eliminated or at least alleviated in comparison with previously known plate heat exchangers.
- the plate heat exchanger 1 comprises also a first inlet port 8 and a first outlet port 9 for a first medium, and a second inlet port 10 and a second outlet port 11 for a second medium.
- the inlet and outlet ports 8-11 extend through one of the end plates 4 and the plate package 2.
- the ports 8-11 may be arranged in many different ways and also through the second end plate 5.
- Each heat exchanger plate 3 comprises a heat transfer area 12 and an edge area 13, which extends around and outside the heat transfer area 12.
- the heat transfer area 12 is substantially centrally located on the heat exchanger plate 3, and in a known manner provided with a corrugation 14 of ridges and valleys.
- the corrugation 14 is obtained through compression-moulding of the metal sheet.
- the corrugation 14 has merely been indicated schematically as extending obliquely over the heat transfer area 12. It is to be noted that the corrugation 14 also may comprise significantly more complicated extensions of the ridges and valleys, for instance along the fishbone pattern known per se.
- heat exchanger plates 3 having a substantially plane heat transfer area may be used within the scope of this invention.
- the edge area 13 have longitudinal portions 13A extending along the longitudinal edges of the heat exchanger plates 3 and short end portions 13B situated in the edge area 13 of the short ends of the plates 3.
- Each heat exchanger plate 3 also comprises a number of portholes 15, (four portholes 15) which extend through the heat exchanger plate 3 and are located inside and in the proximity of the edge area 13.
- the portholes 15 are located in the proximity of a respective corner of the heat exchanger plate 3 and are substantially concentric with the above mentioned inlet and outlet ports 8-11 of the plate heat exchanger 1.
- the base material for the plates may be chosen from several metals and metal alloys.
- the base material is chosen from titanium, nickel, copper, any alloys of the before mentioned, stainless steel and/or carbon steel.
- titanium, any alloys of the before mentioned or stainless steel is preferred.
- the heat exchanger plates 3 are provided in such a manner in the plate package 2 that first plate interspaces 16, which communicate with the first inlet port 8 and the first outlet port 9, and second plate interspaces 17, which communicate with the second inlet port 10 and the second outlet port 11 , are formed, see fig 1 .
- the first and second plate interspaces 16 and 17 are provided in an alternating order in the plate package 2.
- Such a separation of the plate interspaces 16, 17 may be achieved by means of one or several gaskets 18, which extend in gasket grooves 19 which are formed during the compression-moulding of the heat exchanger plates 3.
- the gasket groove 19 of each heat exchanger plate 3 extends, as can be seen in fig. 3 , between the heat transfer area 12 and the edge area 13, in the longitudinal portions 13A extending along the longitudinal edges of the heat exchanger plates 3 and in the short end portions 13B situated in the edge area 13 of the short ends of the plates 3, around the heat transfer area 12 and around each of the portholes 15.
- a gasket 18 is provided before the mounting of the plate heat exchanger 1.
- the gasket 18 extends in a part of the gasket groove 19 in such a way that the gasket 18 encloses the heat transfer area 12 and two of the portholes 15 and also each of the two remaining portholes 15.
- the gasket 18 thus forms three separate areas which are delimited from each other by means of the gasket 18. It is to be noted that the gasket 18 does not necessarily need to be shaped as one single gasket but may also consist of several different gaskets.
- the portholes 15 may however also have any other suitable regular or irregular shape, for instance an oval shape or a polygonal shape, for instance a triangular, a square, a pentagonal etc. shape suitably with somewhat rounded corners.
- the heat exchanger plate 3 may be used in various plate heat exchanger applications and include fewer or more than the portholes disclosed.
- the gasket groove 19 in the longitudinal portions 13A of the edge area 13 extending along the longitudinal edges of the heat exchanger plates 3 is covered by a sealing material before the antifouling coating is applied.
- the plates are then coated on at least one side by the antifouling coating, such that the antifouling coating is not applied on the surfaces of the gasket groove. If both sides of the plate is to be coated by the antifouling coating, then both sides of the gasket groove 19 should be covered by the sealing material.
- the sealing material may cover only the gasket groove per se or all of the longitudinal portions 13A of the edge area 13.
- the sealing material may be a removable piece of adhesive or tape, known in the art.
- the gasket groove may also be masked by a fixture holding the plate and covering the gasket groove 19 on one side or both the front and back sides during the coating. After the antifouling coating step the sealing material is removed.
- the method is quick, cheap and easy to implement in order to manufacture a plate heat exchanger which does not show the phenomenon of "snakeing" i.e. gliding of the gaskets and the plates in the plate package such that the plate package is distorted.
- the method of the invention provides a quick and easy method by which a higher friction is achieved between the plates and the gaskets at the same time as the remaining part of the plates are covered by the antifouling coating and experiencing all the benefits of the coating.
- the coating used according to the present invention may be referred to as a non-stick coating or an antifouling coating and makes it easy to clean the plates of a fouled heat exchanger.
- the coated plates according to the present invention show a better heat transfer over time compared to conventional heat exchanger plates since the latter ones gets fouled much quicker and thus decrease the heat transfer performance to a larger extent.
- the coating of the plates also results in a much more even surface thus resulting in better flow characteristics.
- the pressure drop is reduced over time for a plate heat exchanger according to the present invention in comparison with conventional plate heat exchangers, since the buildup of impurities, microorganisms and other substances is not as pronounced.
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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)
Description
- The invention relates to a method for producing a plate heat exchanger according to the preamble of
claim 1. - Plate heat exchangers provided with gaskets normally comprise a package of heat exchanger plates arranged adjacent to one another. Gaskets are disposed between the heat exchanger plates, or the plates may also be permanently joined together in pairs to form so-called cassettes, e.g. by welding, with gaskets placed between the respective cassettes. The gaskets are accommodated in gasket grooves formed during the form-pressing of the heat exchanger plates. Plate heat exchangers further comprise inlet and outlet ports, which extend through the plate package, for two or more media.
- Heat exchanger plates are normally made by form-pressing of sheet metal and are arranged in the plate package in such a way as to form first plate intermediate spaces which communicate with the first inlet port and the first outlet port, and second plate intermediate spaces which communicate with the second inlet port and the second outlet port. The first and second plate intermediate spaces are disposed alternately in the plate package.
- A heat exchanger plate for a plate heat exchanger, normally includes a heat transfer area and a border area, which is located outside the heat transfer area and which extends along and delimits the heat transfer area. Such a heat exchanger plate further has a number of open portholes. The heat exchanger plates are kept together to a plate package by means of tie bolts.
- The gaskets, which are used between the heat exchanger plates in the plate heat exchanger, are manufactured separately, for instance by compression moulding or injection moulding. The gaskets are usually manufactured in any relatively hard rubber material such as nitrile; EFDM or fluorine rubber. The gasket may be attached to the heat exchanger plate by gluing. The gasket may also include various guide members, for instance so called T-tabs, which extend outwardly from the gasket and which are pressed to attachment in corresponding grooves in the heat exchanger plate.
- Plate heat exchangers are used in many applications where the object is to transfer heat to or from a media having a tendency to stick to a surface, e g dairy products. Over time the plates of the plate heat exchangers in use may get fouled by deposits arising e g from the fluids in the equipment, microbial growth and/or dirt, which leads to a decreased heat transfer and increased pressure drop. This results in an overall reduced performance of the heat exchanger. Eventually, it will be necessary to open the plate heat exchanger and clean the heat exchanger plates. Depending on the fluids used in the heat exchanger, the plates may be seriously fouled and difficult to clean, requiring strong detergents and/or powerful mechanical cleaning over a substantial time period in order to restore the performance of the heat exchanger. The cleaning of the plates may both be time consuming and costly. Also, the process system in which the plate heat exchanger is installed may have to be shut down during said cleaning of the plate heat exchanger.
- The plates of heat exchangers are predominantly made of metal sheets. The base material, i.e. metals used, have a high surface free energy resulting in that most liquids easily wet the surface of the sheets. Also, when heat exchanger plates are produced the forming operation of sheet metal increases the surface roughness which often is associated with faster build-up of fouling deposits. In order to avoid sticking of the media to the heat transfer surface different kinds of anti-fouling coatings are used in order to prevent media from adhering to the surface of the plates and to keep the heat exchangers running for longer time periods. Anti-fouling coatings further provides for easier cleaning and a reduced shut down time for processes where plate heat exchangers are involved.
-
WO 2012/018296 describes plates for a gasketed plate heat exchanger being coated with a sol-gel composition which results in plates with reduced fouling of the plate when in use in a heat exchanger. By applying a coating composition comprising sol-gel material with organosilicon compounds to the heat exchanger plate both the surface free energy and roughness is lowered, leading to reduction of fouling and easy cleaning of heat exchanger plates. - A problem encountered with presently known plate heat exchangers provided with antifouling coatings is the phenomenon of "snakeing", i e a phenomenon wherein the plates of the plate package slide when they are assembled or a short period after they are assembled. This problem is related to the non-sticking surface properties of anti-fouling coated plates and to the lack of or low friction between the anti-fouling surface in the gasket groove and the gasket. Furthermore, cracks in the coating may occur due to torque and tension forces acting on the plates when the plate package is exhibiting snakeing.
- It is an object of the invention to at least partly overcome one or more limitations of the prior art.
- Another objective is to provide a method for producing a plate heat exchanger provided with an antifouling coating wherein the phenomenon of "snakeing" has been eliminated or at least alleviated in comparison with previously known plate heat exchangers.
- This object has been achieved by a method for producing a plate heat exchanger which is characterized in that the longitudinal portions of the gasket groove are covered by a sealing material on each side of the plate before the anti-fouling coating is applied, the plates are then coated by an anti-fouling coating, and the sealing material is removed after the antifouling coating step. Still other objects, features, aspects and advantages of the present invention will appear from the following detailed description, from the attached claim as well as from the drawings.
- The invention will now be described in more detail with reference to the appended schematic drawings, in which
-
Fig. 1 discloses schematically a side view of a plate heat exchanger. -
Fig. 2 discloses schematically a plan view of the plate heat exchanger inFig 1 . -
Fig. 3 discloses schematically a heat exchanger plate of the plate heat exchanger inFig 1 . -
Fig. 4 discloses the heat exchanger plate inFig 3 with gaskets provided. -
Figs 1 and 2 disclose aplate heat exchanger 1 comprising aplate package 2 havingheat exchanger plates 3 which are provided beside each other. Theplate package 2 is provided between twoend plates end plates plate package 2 and against each other by means oftie bolts 6 which extend through theend plates tie bolts 6 comprise threads and theplate package 2 may thus be compressed by screwingnuts 7 on thetie bolts 6 in a manner known per se. Fourtie bolts 6 are indicated. It is to be noted that the number oftie bolts 6 may vary and be different in different applications. - The
plate heat exchanger 1 comprises also afirst inlet port 8 and afirst outlet port 9 for a first medium, and asecond inlet port 10 and asecond outlet port 11 for a second medium. The inlet and outlet ports 8-11 extend through one of theend plates 4 and theplate package 2. The ports 8-11 may be arranged in many different ways and also through thesecond end plate 5. - Each
heat exchanger plate 3 comprises aheat transfer area 12 and anedge area 13, which extends around and outside theheat transfer area 12. Theheat transfer area 12 is substantially centrally located on theheat exchanger plate 3, and in a known manner provided with acorrugation 14 of ridges and valleys. Thecorrugation 14 is obtained through compression-moulding of the metal sheet. Thecorrugation 14 has merely been indicated schematically as extending obliquely over theheat transfer area 12. It is to be noted that thecorrugation 14 also may comprise significantly more complicated extensions of the ridges and valleys, for instance along the fishbone pattern known per se. Alsoheat exchanger plates 3 having a substantially plane heat transfer area may be used within the scope of this invention. Theedge area 13 havelongitudinal portions 13A extending along the longitudinal edges of theheat exchanger plates 3 andshort end portions 13B situated in theedge area 13 of the short ends of theplates 3. - Each
heat exchanger plate 3 also comprises a number ofportholes 15, (four portholes 15) which extend through theheat exchanger plate 3 and are located inside and in the proximity of theedge area 13. Theportholes 15 are located in the proximity of a respective corner of theheat exchanger plate 3 and are substantially concentric with the above mentioned inlet and outlet ports 8-11 of theplate heat exchanger 1. - The base material for the plates may be chosen from several metals and metal alloys. Preferably, the base material is chosen from titanium, nickel, copper, any alloys of the before mentioned, stainless steel and/or carbon steel. However, titanium, any alloys of the before mentioned or stainless steel is preferred.
- The
heat exchanger plates 3 are provided in such a manner in theplate package 2 that first plate interspaces 16, which communicate with thefirst inlet port 8 and thefirst outlet port 9, and second plate interspaces 17, which communicate with thesecond inlet port 10 and thesecond outlet port 11 , are formed, seefig 1 . The first and second plate interspaces 16 and 17 are provided in an alternating order in theplate package 2. - Such a separation of the plate interspaces 16, 17 may be achieved by means of one or
several gaskets 18, which extend ingasket grooves 19 which are formed during the compression-moulding of theheat exchanger plates 3. Thegasket groove 19 of eachheat exchanger plate 3 extends, as can be seen infig. 3 , between theheat transfer area 12 and theedge area 13, in thelongitudinal portions 13A extending along the longitudinal edges of theheat exchanger plates 3 and in theshort end portions 13B situated in theedge area 13 of the short ends of theplates 3, around theheat transfer area 12 and around each of theportholes 15. - At each heat exchanger plate 3 a
gasket 18 is provided before the mounting of theplate heat exchanger 1. Thegasket 18 extends in a part of thegasket groove 19 in such a way that thegasket 18 encloses theheat transfer area 12 and two of theportholes 15 and also each of the two remainingportholes 15. Thegasket 18 thus forms three separate areas which are delimited from each other by means of thegasket 18. It is to be noted that thegasket 18 does not necessarily need to be shaped as one single gasket but may also consist of several different gaskets. - During the mounting, every second
heat exchanger plate 3 may be rotated 180°, for instance around a central normal axis or round a central longitudinal axis. Thereafter theheat exchanger plates 3 are compressed so that the desired first and second plate interspaces are obtained. In theplate package 2, the first medium may be introduced through thefirst inlet port 8, through the first plate interspaces 16 and out through thefirst outlet port 9. The second medium may be introduced through thesecond inlet port 10, through the second plate interspaces 17 and out through thesecond outlet port 11. The two media may for instance be conveyed in a counter current flow, as indicated infigs. 2 and3 , or in parallel flow in relation to each other. Theportholes 15 have a cylindrical or substantially circular shape. Theportholes 15 may however also have any other suitable regular or irregular shape, for instance an oval shape or a polygonal shape, for instance a triangular, a square, a pentagonal etc. shape suitably with somewhat rounded corners. Furthermore, theheat exchanger plate 3 may be used in various plate heat exchanger applications and include fewer or more than the portholes disclosed. - According to the method of the invention the
gasket groove 19 in thelongitudinal portions 13A of theedge area 13 extending along the longitudinal edges of theheat exchanger plates 3 is covered by a sealing material before the antifouling coating is applied. The plates are then coated on at least one side by the antifouling coating, such that the antifouling coating is not applied on the surfaces of the gasket groove. If both sides of the plate is to be coated by the antifouling coating, then both sides of thegasket groove 19 should be covered by the sealing material. The sealing material may cover only the gasket groove per se or all of thelongitudinal portions 13A of theedge area 13. The sealing material may be a removable piece of adhesive or tape, known in the art. The gasket groove may also be masked by a fixture holding the plate and covering thegasket groove 19 on one side or both the front and back sides during the coating. After the antifouling coating step the sealing material is removed. - By protecting the
gasket groove 19 from being coated by the antifouling material a clean metal surface is achieved in the gasket groove. The clean metal has a higher friction to thegasket 18 which is to be arranged in thegasket groove 19 when the heat exchanger is assembled. The higher friction between thegasket groove 19 and thegasket 18 prevents thegasket 18 from sliding and accordingly theplates 3 in theplate package 2 from sliding. The method is quick, cheap and easy to implement in order to manufacture a plate heat exchanger which does not show the phenomenon of "snakeing" i.e. gliding of the gaskets and the plates in the plate package such that the plate package is distorted. The method of the invention provides a quick and easy method by which a higher friction is achieved between the plates and the gaskets at the same time as the remaining part of the plates are covered by the antifouling coating and experiencing all the benefits of the coating. - The coating used according to the present invention may be referred to as a non-stick coating or an antifouling coating and makes it easy to clean the plates of a fouled heat exchanger. The coated plates according to the present invention show a better heat transfer over time compared to conventional heat exchanger plates since the latter ones gets fouled much quicker and thus decrease the heat transfer performance to a larger extent. The coating of the plates also results in a much more even surface thus resulting in better flow characteristics. Also the pressure drop is reduced over time for a plate heat exchanger according to the present invention in comparison with conventional plate heat exchangers, since the buildup of impurities, microorganisms and other substances is not as pronounced.
- The coated plates according to the present invention may easily be cleaned just using high pressure washing with water. With a plate according to the present invention there is no need for extensive time consuming mechanical cleaning or cleaning using strong acids, bases or detergents, such as e.g. NaOH and HNO3.
- The invention is not limited to the described embodiments but may be varied and modified within the scope of the following claim.
Claims (1)
- Method for producing a plate heat exchanger (1) comprising a plurality of heat exchanger plates (3), wherein the heat exchanger plates (3) are provided adjacent each other and form a plate package (2) with first plate interspaces (16) for a first medium and second plate interspaces (17) for a second medium, wherein each of the heat exchanger plates comprises
portholes (15) which form ports (8, 9, 10, 11) extending through the plate package,
a heat transfer area (12),
an edge area (13) extending outside the heat transfer area (12) and the ports (8, 9, 10, 11),
a gasket groove (19) extending in the edge area (13) outside the heat transfer area (12) and the ports (8, 9, 10, 11),
and wherein a gasket is provided in the gasket groove (19) for tight abutment against an adjacent plate (3) in the plate heat exchanger (1), the heat exchanger plates (3) being at least partly coated with an antifouling coating,
characterized in that
longitudinal portions (13A) of the gasket groove (19) are covered by a sealing material on at least one side of the plates (3) before the antifouling coating is applied, the plates (3) are then coated by an anti-fouling coating on at least one side, and the sealing material is removed after the antifouling coating step.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK13197164.0T DK2884213T3 (en) | 2013-12-13 | 2013-12-13 | PROCEDURE FOR PREPARING A PLATE HEAT EXCHANGE |
PL13197164T PL2884213T3 (en) | 2013-12-13 | 2013-12-13 | Method for producing a plate heat exchanger |
EP13197164.0A EP2884213B1 (en) | 2013-12-13 | 2013-12-13 | Method for producing a plate heat exchanger |
ES13197164T ES2701424T3 (en) | 2013-12-13 | 2013-12-13 | Method for manufacturing a plate heat exchanger |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13197164.0A EP2884213B1 (en) | 2013-12-13 | 2013-12-13 | Method for producing a plate heat exchanger |
Publications (2)
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EP2884213A1 EP2884213A1 (en) | 2015-06-17 |
EP2884213B1 true EP2884213B1 (en) | 2018-09-12 |
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EP13197164.0A Active EP2884213B1 (en) | 2013-12-13 | 2013-12-13 | Method for producing a plate heat exchanger |
Country Status (4)
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EP (1) | EP2884213B1 (en) |
DK (1) | DK2884213T3 (en) |
ES (1) | ES2701424T3 (en) |
PL (1) | PL2884213T3 (en) |
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CN113670097B (en) * | 2021-08-30 | 2024-05-10 | 兰州兰石换热设备有限责任公司 | Detachable plate heat exchanger for preventing marine microorganism from blocking |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2597412A1 (en) * | 2011-11-28 | 2013-05-29 | Alfa Laval Corporate AB | Block-type plate heat exchanger with anti-fouling properties |
Family Cites Families (2)
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US6261422B1 (en) * | 2000-01-04 | 2001-07-17 | Ionica, Llc | Production of hollowed/channeled protective thermal-barrier coatings functioning as heat-exchangers |
SA111320468B1 (en) * | 2010-05-26 | 2015-04-01 | الفا لافال كوربوريت ايه بي | Heat exchanger plates with anti-fouling properties |
-
2013
- 2013-12-13 ES ES13197164T patent/ES2701424T3/en active Active
- 2013-12-13 PL PL13197164T patent/PL2884213T3/en unknown
- 2013-12-13 EP EP13197164.0A patent/EP2884213B1/en active Active
- 2013-12-13 DK DK13197164.0T patent/DK2884213T3/en active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2597412A1 (en) * | 2011-11-28 | 2013-05-29 | Alfa Laval Corporate AB | Block-type plate heat exchanger with anti-fouling properties |
Also Published As
Publication number | Publication date |
---|---|
PL2884213T3 (en) | 2018-12-31 |
DK2884213T3 (en) | 2019-01-02 |
ES2701424T3 (en) | 2019-02-22 |
EP2884213A1 (en) | 2015-06-17 |
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