WO2003040643A1 - Procede d'accroissement de la duree de vie utile de joints pour echangeurs thermiques a plaques et utilisation de ces joints dans un echangeur thermique a plaques - Google Patents

Procede d'accroissement de la duree de vie utile de joints pour echangeurs thermiques a plaques et utilisation de ces joints dans un echangeur thermique a plaques Download PDF

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Publication number
WO2003040643A1
WO2003040643A1 PCT/SE2002/001118 SE0201118W WO03040643A1 WO 2003040643 A1 WO2003040643 A1 WO 2003040643A1 SE 0201118 W SE0201118 W SE 0201118W WO 03040643 A1 WO03040643 A1 WO 03040643A1
Authority
WO
WIPO (PCT)
Prior art keywords
gaskets
fluoropolymer
plates
gasket
plate heat
Prior art date
Application number
PCT/SE2002/001118
Other languages
English (en)
Inventor
Bernt Erik Tagesson
Original Assignee
Alfa Laval Corporation Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alfa Laval Corporation Ab filed Critical Alfa Laval Corporation Ab
Priority to DE10297400T priority Critical patent/DE10297400T5/de
Publication of WO2003040643A1 publication Critical patent/WO2003040643A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/104—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by structure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/064—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces the packing combining the sealing function with other functions
    • 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 present invention relates to a method to increase the life of gaskets intended to be used in plate heat exchangers.
  • the gaskets are placed in gasket grooves in the plates which constitute the plate heat exchanger and the gaskets are on one side in contact with a medium giving off or taking up heat and on its other side with surrounding, atmospheric air.
  • the temperature of the medium giving off heat is very high.
  • an oxidative degradation of the surface of the gasket takes place, which gives a surface layer, which forms a protection for the gasket.
  • the gaskets in a plate heat exchanger must have such an elasticity that they are compressed when the plate heat exchanger is tightened by means of clamping bolts, are pressed out and give a tightening force such that the medium giving off or taking up heat can not leak out from the plate heat exchanger.
  • a usual gasket material for high temperature applications is fluorocarbon rubber (FKM), which is a material which may withstand high temperatures (180 °C), but which is very expensive.
  • FKM fluorocarbon rubber
  • HNBR hydrogenated nitrile
  • EPDM ethylene, propylene and an ethylidenenorborene.
  • This material may be used at temperatures up to 160 °C and has at this temperature a life of about one year. At temperatures below 130 - 140 °C the surface of the gasket is not attacked. In continuous operation at 130 - 140 °C the gasket has a life of about 2-3 years.
  • a thin layer of a fluoropolymer is applied at least on the parts of the gaskets which bear against adjacent plates and are situated at the part of the gasket which is turned against surrounding air alternatively that the bottoms of the gaskets grooves in the plates on both sides of the plates at least in its outer part turned against the surrounding air are coated with a thin layer of fluoropolymer.
  • Each gasket bears with one of its sides against the bottom of the gasket groove and with its other side against the lower side of the gasket groove of an adjacent plate.
  • Each plate shall consequently be coated both in the gasket groove on one side of the plate and on the back (lower side) of the gasket groove on the other side of the plate.
  • the thin layer of fluoropolymer may be applied on the whole part of the gasket which abuts the bottom of the gasket groove and the lower side of the gasket groove of an adjacent plate. If the gasket grooves in the heat exchanger plate instead are coated with fluoropolymer the bottom of the groove may at its whole width be coated with fluoropolymer.
  • gasket may if so is suitable be coated with fluoropolymer over its whole circumference, the important thing is however that there is a layer of fluoropolymer on the side turned against the surrounding air.
  • heat exchanger plate may, if so is suitable, be completely coated with fluoropolymer.
  • the layer of fluoropolymer applied to the surface of the gasket has a thickness which is below 0,25 mm, preferably 0,1 mm.
  • the fluoropolymer used for the coating may consist of polytetrafluoroethylene (PTFE), fluorinated ethylene propylene (FEP), perfluoroalkoxy (PFA), polyvinyl fluoride (PVF), polyvinylidene fluoride (PVDF) or fluorocarbon rubber (FKM). It is known per se to produce gaskets of fluoropolymers and to provide gasket material with a protecting layer of fluoropolymer. The purpose of the earlier described use of fluoropolymer is however to make use of the high chemical resistance of fluoropolymers in surroundings where aggressive fluids are treated.
  • gaskets are however not suitable when one desires a gasket with a high elasticity, since a gasket of fluoropolymer is rigid and at that cumbersome and lacks the flexibility which is needed in order to obtain a tightening between the plates in a plate heat exchanger.
  • the fluoropolymer is suitably applied on the surface of the gasket by painting or spraying or by dipping the gasket in a mixture of fluoropolymer and a binder followed by curing or vulcanization.
  • the fluoropolymer may be dispersed in a binder which after curing binds the fluoropolymer to the surface of the gasket. If the coating material consists of fluorocarbon rubber this may be dispersed in a solvent with an addition of vulcanizing agent to bind the polymer to the gasket surface.
  • the invention may use a gasket material which retains its flexibility also under difficult operation conditions as has been described above and which life through the coating is at least doubled. This effect may probably be attributed to the low permeability for oxygen in the fluoropolymer.
  • the invention also comprises use of plates or gaskets coated according to the method of the main claim in plate heat exchangers intended for heat exchange at a high temperature.
  • figure 1 and 2 of which show a cross section of a gasket coated according to the invention
  • figure 3 and 4 show how the plates in a plate heat exchanger are coated according to the invention.
  • Figure 1 shows a gasket 1 in cross-section.
  • the gasket is on its upper and lower side coated with a thin layer 2 of fluoropolymer.
  • the gasket has been coated with fluoropolymer only on a part of its upper and lower side.
  • the right side of the gasket should be turned against the surrounding atmosphere.
  • the thickness of the coating shown on the drawing has been exaggerated for drawing technical reasons, since the thickness of the coating according to the invention is below 0,25 mm.
  • Figure 2 shows a gasket 3 which on its whole upper and lower side has been coated with a thin layer 4 of fluoropolymer.
  • FIG 3 shows two neighbouring plates 5 in a plate heat exchanger.
  • the plates 5 each have a groove intended for the gasket which shall seal the space 7 between the plates, where a medium giving off or taking up heat is brought to flow.
  • the space 8 on the other side of the gasket groove is open against the atmospheric air.
  • the part of the gasket groove that is turned against the atmospheric air has been coated with a thin layer 9 of fluoropolymer. Also a part of the lower side of the gasket groove has been coated with a layer 10 of fluoropolymer. Also in this figure the proportions between the thickness of the plates and the layer of fluoropolymer are incorrect, since it should be impossible to be able to see the layer of fluoropolymer in a correctly executed drawing.
  • Figure 4 shows two neighbouring plates 11 in a plate heat exchanger, where however the whole bottom 12 of the gasket groove on both sides has been coated with a layer 13 of fluoropolymer.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Gasket Seals (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

L'invention concerne un procédé permettant d'accroître la durée de vie utile de joints utilisés dans des échangeurs thermiques à plaques dans lesquels l'échange thermique est effectué à hautes températures. Ces joints sont destinés à être disposés dans des rainures de joints formées dans les plaques constituant l'échangeur thermique à plaques, et ils sont en contact par un côté avec un milieu dégageant ou absorbant de la chaleur, et par l'autre côté avec l'air ambiant. Selon ce procédé, une fine couche de fluoropolymère est appliquée au moins sur les parties de la circonférence des joints qui reposent contre des plaques adjacentes et qui sont situées à côté du joint tourné vers l'air ambiant, de manière alternée, de sorte que le fond des rainures de joints formées dans les deux côtés des plaques est revêtu d'une fine couche de fluoropolymère, au moins sur le côté extérieur tourné vers l'air ambiant. Les joints et les plaques revêtus au moyen du procédé selon l'invention sont utilisés dans des échangeurs thermiques à plaques conçus pour effectuer un échange thermique à hautes températures.
PCT/SE2002/001118 2001-11-06 2002-06-10 Procede d'accroissement de la duree de vie utile de joints pour echangeurs thermiques a plaques et utilisation de ces joints dans un echangeur thermique a plaques WO2003040643A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE10297400T DE10297400T5 (de) 2001-11-06 2002-06-10 Verfahren zum Erhöhen der Lebensdauer von Dichtungen für Plattenwärmetauscher und Verwendung von Dichtungen in einem Plattenwärmetauscher

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0103686A SE0103686D0 (sv) 2001-11-06 2001-11-06 Metod för att applicera ett beläggningsmaterial på en yta, packning respektive värmeväxlingsplatta belagd enligt metoden och plattvärmeväxlare med sådan packning respektive värmeväxlingsplatta
SE0103686-2 2001-11-06

Publications (1)

Publication Number Publication Date
WO2003040643A1 true WO2003040643A1 (fr) 2003-05-15

Family

ID=20285885

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2002/001118 WO2003040643A1 (fr) 2001-11-06 2002-06-10 Procede d'accroissement de la duree de vie utile de joints pour echangeurs thermiques a plaques et utilisation de ces joints dans un echangeur thermique a plaques

Country Status (3)

Country Link
DE (1) DE10297400T5 (fr)
SE (1) SE0103686D0 (fr)
WO (1) WO2003040643A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012018296A1 (fr) * 2010-05-26 2012-02-09 Alfa Laval Corporate Ab Plaques d'échangeur de chaleur présentant des propriétés antisalissures
DK178461B1 (en) * 2014-09-02 2016-03-29 Jørgen Pedersen Method for prolonged life of gaskets in plate heat exchangers

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1085271A (en) * 1964-01-06 1967-09-27 Bba Group Ltd Improved packing material and packing made therefrom
DE1525515A1 (de) * 1965-09-27 1969-06-12 Apv Co Ltd Elastische Dichtung
DE3643281A1 (de) * 1986-12-18 1988-07-07 Goetze Ag Flachdichtung, insbesondere zylinderkopfdichtung fuer verbrennungskraftmaschinen
EP0396277A1 (fr) * 1989-04-29 1990-11-07 Peter John Children Joints
SE468916B (sv) * 1988-06-17 1993-04-05 Gislaved Ab Packning foer plattvaermevaexlare
WO1995007422A1 (fr) * 1993-09-08 1995-03-16 W.L. Gore & Associates, Inc. Materiau d'etancheite pour appareil a plaques et cadres et ses procedes de fabrication et d'utilisation
DE19706226A1 (de) * 1997-02-18 1998-08-20 Thoenes Dichtungswerk Gmbh Flachdichtung aus einem Fasermaterial und Verfahren zu deren Herstellung
EP1025987A1 (fr) * 1997-10-27 2000-08-09 Daikin Industries, Ltd. Stratifie de caoutchouc perfluore et procede de production dudit stratifie

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1085271A (en) * 1964-01-06 1967-09-27 Bba Group Ltd Improved packing material and packing made therefrom
DE1525515A1 (de) * 1965-09-27 1969-06-12 Apv Co Ltd Elastische Dichtung
DE3643281A1 (de) * 1986-12-18 1988-07-07 Goetze Ag Flachdichtung, insbesondere zylinderkopfdichtung fuer verbrennungskraftmaschinen
SE468916B (sv) * 1988-06-17 1993-04-05 Gislaved Ab Packning foer plattvaermevaexlare
EP0396277A1 (fr) * 1989-04-29 1990-11-07 Peter John Children Joints
WO1995007422A1 (fr) * 1993-09-08 1995-03-16 W.L. Gore & Associates, Inc. Materiau d'etancheite pour appareil a plaques et cadres et ses procedes de fabrication et d'utilisation
DE19706226A1 (de) * 1997-02-18 1998-08-20 Thoenes Dichtungswerk Gmbh Flachdichtung aus einem Fasermaterial und Verfahren zu deren Herstellung
EP1025987A1 (fr) * 1997-10-27 2000-08-09 Daikin Industries, Ltd. Stratifie de caoutchouc perfluore et procede de production dudit stratifie

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012018296A1 (fr) * 2010-05-26 2012-02-09 Alfa Laval Corporate Ab Plaques d'échangeur de chaleur présentant des propriétés antisalissures
JP2013528276A (ja) * 2010-05-26 2013-07-08 アルファ・ラバル・コーポレイト・エービー 汚れ防止特性をもつ熱交換器プレート
DK178461B1 (en) * 2014-09-02 2016-03-29 Jørgen Pedersen Method for prolonged life of gaskets in plate heat exchangers

Also Published As

Publication number Publication date
DE10297400T5 (de) 2005-02-10
SE0103686D0 (sv) 2001-11-06

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