EP0576511B1 - Method of providing heat transfer plates with a layer of a surface protecting material - Google Patents

Method of providing heat transfer plates with a layer of a surface protecting material Download PDF

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Publication number
EP0576511B1
EP0576511B1 EP92906823A EP92906823A EP0576511B1 EP 0576511 B1 EP0576511 B1 EP 0576511B1 EP 92906823 A EP92906823 A EP 92906823A EP 92906823 A EP92906823 A EP 92906823A EP 0576511 B1 EP0576511 B1 EP 0576511B1
Authority
EP
European Patent Office
Prior art keywords
surface protecting
transfer plates
heat transfer
plate
heat exchanger
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.)
Expired - Lifetime
Application number
EP92906823A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0576511A1 (en
Inventor
Ladislav Novak
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alfa Laval Thermal AB
Original Assignee
Alfa Laval Thermal 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 Thermal AB filed Critical Alfa Laval Thermal AB
Publication of EP0576511A1 publication Critical patent/EP0576511A1/en
Application granted granted Critical
Publication of EP0576511B1 publication Critical patent/EP0576511B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/60—Deposition of organic layers from vapour phase
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
    • 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
    • F28F19/04—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of rubber; of plastics material; of varnish
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate

Definitions

  • Heat transfer plates are made of many different materials which are more or less resistant to corrosion or other influence by different heat exchange fluids.
  • heat transfer plates of metal which for a certain purpose are not sufficiently resistant to corrosion, it is technically possible, but in practice difficult, to increase the resistance to corrosion of the plates to an acceptable cost by providing the plates with an outer layer of another metal.
  • heat transfer plates of thin sheet metal are often provided with corrugations or other protuberances in their heat transferring portions, which in a plate heat exchanger abut against each other by a large force at a great number of contact places distributed across the heat transferring portions. If the plates were covered by thin plastic layers, such layers would easily be broken at the said contact places.
  • the present invention relates to a novel and inexpensive way of providing heat transfer plates with a layer of a surface protecting material, which method is characterized in that the heat transfer plates are first assembled to a plate heat exchanger, in which plate interspaces for the through flow of two heat exchange fluids are formed, and that a gaseous medium containing the surface protecting material is then introduced into the plate heat exchanger at least in those plate interspaces being intended for through flow of one of said heat exchange fluids, the surface protecting material in a way known per se being caused to form a layer on the surfaces of the heat transfer plates.
  • the surface protecting material contained by the gaseous medium can be a vapour forming part or all of the gaseous medium, or may be suspended in the gaseous medium.
  • the method according to the invention may be applied on any kind of plate heat exchanger but is particularly intended for plate heat exchangers having permanently assembled heat transfer plates, e.g. welded or brazed plate heat exchangers.
  • the invention provides in addition to a surface protection for the heat transfer plates also a surface protection for the brazing material used between the heat transfer plates. This means that the area in which brazed plate heat exchangers may be used can be extended, since the brazing material sometimes constitutes an obstacle for such heat exchangers to be used in connection with certain liquids.
  • plastics is used as a surface protecting material.
  • the plastic material then may be introduced into the plate heat exchanger either in the form of a mist, i.e. in the form of small liquid drops suspended in a gas, or in an evaporated form. In the latter case the gaseous medium being introduced into the plate heat exchanger may completely consist of evaporated plastics.
  • a technique that may be used is described in the patent specification SU-A-1151546.
  • a substance, di-p-xylylene may be transformed from a solid state to a gas by sublimation in a first chamber at a pressure of 1 mm Hg and a temperature of 200°C, after which the substance is subjected to pyrolysis in a second chamber at 600°C.
  • a substance, e.g. di-p-xylylene, treated in this manner would then according to the invention be sucked into an assembled plate heat exchanger kept at a relatively low temperature. e.g. room temperature, so that the gaseous substance is condensated onto the surfaces of the heat transfer plates in the plate heat exchanger and, simultaneously, a polymerization takes place.
  • the sucking of the gaseous plastic material into the plate heat exchanger may be performed in several steps for obtainment of several layers of plastics on the surfaces in question. If necessary for a sufficient covering of all the surfaces by layers of plastics, the suction of the gaseous plastic material into the plate heat exchanger may be performed alternately from the inlet and the outlet, respectively, of the plate heat exchanger for the heat exchange fluids.
  • a permanently assembled brazed plate heat exchanger 1 of a conventional kind which has an inlet 2 and an outlet 3 for a first heat exchange fluid and an inlet 4 and an outlet 5 for a second heat exchange fluid.
  • the plate heat exchanger may be for instance of the kind described more closely in WO 88/09473 or GB-A 2.005.398.
  • the drawing shows schematically an apparatus 6 for evaporation of a plastic material.
  • This apparatus communicates through a conduit 7 with an apparatus 8 for a pyrolysis of evaporated plastic material.
  • the apparatus 8 in turn communicates through conduits 9 and 10 with the inlet 2 of the plate heat exchanger for said first heat exchange fluid.
  • the plate heat exchanger outlet 3 for the same heat exchange fluid communicates through conduits 11 and 12 with a liquid trap 13 which in turn through a conduit 14 communicates with a vacuum pump 15.
  • the shown plant is intended to operate in the following manner.
  • the evaporating apparatus 6 is charged batchwise or continuously with a plastic material in a solid or liquid state.
  • a subpressure is generated in the apparatus 6 corresponding to an absolute pressure of about 1 mm Hg.
  • a desired subpressure prevails in the apparatus 6, this is heated to a temperature of between 150°C and 200°C, the supplied plastic material being evaporated.
  • the vacuum pump 15 By means of the vacuum pump 15 the formed vapour is sucked through the conduit 7, which may comprise a suitable throttle, into the apparatus 8 in which there is maintained by means of the vacuum pump a subpressure corresponding to an absolute pressure of about 0,5 mm Hg.
  • a temperature of between 600 and 700°C prevails in the apparatus 8, so that a pyrolysis is obtained of the incoming vapour of plastic material.
  • the vacuum pump 15 By means of the vacuum pump 15 the vapour of plastic material is sucked further on through the conduit 9, which may contain a suitable throttle, and through the conduit 10 into every second plate interspace in the plate heat exchanger 1. Within these plate interspaces a subpressure corresponding to an absolute pressure of 0,1 mm Hg is maintained.
  • the whole plate heat exchanger is kept at a relatively low temperature, e.g. room temperature, vapour condensating onto one side of each of the plates in the plate heat exchanger. Vapour also condensates onto such inner parts of the plate heat exchanger which delimit inlet and outlet channels to and from, respectively, the plate interspaces.
  • a certain excess amount of vapour may be sucked further on through the conduits 11 and 12 to the liquid trap 13, in which it is condensed.
  • conduits 16 and 17 are used. Either, all of the conduits 10, 11, 16 and 17 may be open for simultaneous through flow, or the through flow may be controlled by means of not shown valves such that evaporated plastic material is first introduced only into every second plate interspace of the plate heat exchanger and, thereafter, evaporated plastic material is introduced only into the rest of the plate interspaces.
  • valves are preferably arranged at least in the branch conduits corresponding to the conduits 10 and 17, so that the different plate heat exchangers, or parts thereof, may be successively connected to the apparatus 8. In this manner a relatively small vacuum pump may be used even if a large number of heat exchangers are connected to the plant.
  • valves are arranged in all of the branch conduits, i.e. even those corresponding to the conduits 11 and 16, it is possible during operation of the plant to remove treated heat exchangers successively from the plant and replace them by new heat exchangers to be treated.
  • the plant thus may be kept in operation continuously as long as desired.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Laminated Bodies (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
EP92906823A 1991-03-25 1992-03-20 Method of providing heat transfer plates with a layer of a surface protecting material Expired - Lifetime EP0576511B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9100889A SE468159B (sv) 1991-03-25 1991-03-25 Foerfarande foer att belaegga vaermeoeverfoeringsplattor i en plattvaermevaexlare med ett skikt av ytskyddande material
SE9100889 1991-03-25
PCT/SE1992/000172 WO1992016310A1 (en) 1991-03-25 1992-03-20 Method of providing heat transfer plates with a layer of a surface protecting material

Publications (2)

Publication Number Publication Date
EP0576511A1 EP0576511A1 (en) 1994-01-05
EP0576511B1 true EP0576511B1 (en) 1995-10-25

Family

ID=20382269

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92906823A Expired - Lifetime EP0576511B1 (en) 1991-03-25 1992-03-20 Method of providing heat transfer plates with a layer of a surface protecting material

Country Status (5)

Country Link
EP (1) EP0576511B1 (sv)
JP (1) JPH06506053A (sv)
DE (1) DE69205679T2 (sv)
SE (1) SE468159B (sv)
WO (1) WO1992016310A1 (sv)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9402904L (sv) * 1994-09-01 1996-03-02 Lars Persson Värmeväxlare och förfarande för tillverkning därav
EP1129789B1 (en) * 2000-03-03 2006-06-21 Riello S.p.A. Protection of the water-side surfaces of heat exchangers used in boilers and gas fired water heaters
SE535209C2 (sv) 2010-06-15 2012-05-22 Alfa Laval Corp Ab Korrosionsbeständig plattvärmeväxlare med tantalhaltig beläggning
EP2458030A1 (en) 2010-11-30 2012-05-30 Alfa Laval Corporate AB Method of coating a part of a heat exchanger and heat exchanger
CA2934772C (en) 2013-12-23 2021-04-27 Bcn Peptides, S.A. Bicalutamide analogs or (s)-bicalutamide as exocytosis activating compounds for use in the treatment of a lysosomal storage disorder or glycogenosis

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2059548C3 (de) * 1970-10-24 1979-07-05 Metallgesellschaft Ag, 6000 Frankfurt Verfahren zum Beschichten der Innenfläche von Metallrohren mit Kunststoffen
AT375295B (de) * 1979-03-06 1984-07-25 Voest Alpine Ag Verfahren und vorrichtung zur innenbeschichtung von rohren
US4518623A (en) * 1982-11-24 1985-05-21 Riley Thomas J Polymeric film coating method with continuous deposition pressure control
DE3531150A1 (de) * 1985-08-31 1987-03-05 Kreiselmaier Ernst Gmbh Co Verfahren zur beschichtung von rohrboeden od.dgl. von kondensatoren, kuehlern, waermetauschern od.dgl. mit einem korrosionsschutzmittel
SE458884B (sv) * 1987-05-29 1989-05-16 Alfa Laval Thermal Ab Permanent sammanfogad plattvaermevaexlare med sammanhaallande organ vid portarna

Also Published As

Publication number Publication date
DE69205679D1 (de) 1995-11-30
EP0576511A1 (en) 1994-01-05
WO1992016310A1 (en) 1992-10-01
SE9100889D0 (sv) 1991-03-25
SE9100889L (sv) 1992-09-26
SE468159B (sv) 1992-11-16
DE69205679T2 (de) 1996-03-21
JPH06506053A (ja) 1994-07-07

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