EP1925808B1 - Echangeur thermique, en particulier échangeur thermique pour gaz d'échappement - Google Patents

Echangeur thermique, en particulier échangeur thermique pour gaz d'échappement Download PDF

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Publication number
EP1925808B1
EP1925808B1 EP07022450.6A EP07022450A EP1925808B1 EP 1925808 B1 EP1925808 B1 EP 1925808B1 EP 07022450 A EP07022450 A EP 07022450A EP 1925808 B1 EP1925808 B1 EP 1925808B1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
exhaust gas
coating
gas heat
protection layer
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.)
Ceased
Application number
EP07022450.6A
Other languages
German (de)
English (en)
Other versions
EP1925808A3 (fr
EP1925808A2 (fr
Inventor
Peter Dipl.-Ing. Englert
Snjezana Dr. Boger
Matthias Dipl.-Ing. Pfitzer
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.)
Mahle Behr GmbH and Co KG
Original Assignee
Mahle Behr GmbH and Co KG
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 Mahle Behr GmbH and Co KG filed Critical Mahle Behr GmbH and Co KG
Publication of EP1925808A2 publication Critical patent/EP1925808A2/fr
Publication of EP1925808A3 publication Critical patent/EP1925808A3/fr
Application granted granted Critical
Publication of EP1925808B1 publication Critical patent/EP1925808B1/fr
Ceased legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/11—Manufacture or assembly of EGR systems; Materials or coatings specially adapted for EGR systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters

Definitions

  • the invention relates to a heat exchanger, in particular exhaust gas heat exchanger, with at least one of a medium, in particular of exhaust gas, acted upon surface of metal, in particular of aluminum or stainless steel, which is provided with a coating.
  • the invention also relates to a method for producing a heat exchanger described above.
  • Exhaust gas mainly from diesel engines, leads in exhaust gas heat exchangers together with moisture and temperature to corrosion attacks on the metallic materials used. To protect against corrosion, temperature-resistant coatings can be used.
  • the WO 2005/089960 A1 discloses a heat exchanger according to the preamble of claim 1 and a method according to the preamble of claim 5.
  • the object of the invention is to provide a heat exchanger with a comparison with the prior art improved protective layer.
  • the object is in a heat exchanger, in particular exhaust gas heat exchanger, with at least one of a medium, in particular exhaust gas, acted upon surface of metal, in particular of aluminum or stainless steel, which is provided with a coating, achieved in that the coating by a first high operating temperature of more than 250 ° C, in a corrosion-resistant, partially ceramic and difficult to wet oleophobic protective layer can be implemented and / or implemented.
  • the heat exchanger is delivered with the unreacted coating and mounted. According to the invention, this coating automatically converts into the desirable and necessary exhaust-gas-side protective layer during the first start-up due to the high operating temperature occurring in the process.
  • a preferred embodiment of the heat exchanger is characterized in that the coating and / or the protective layer has catalytically active additives. Advantageously, this can reduce the proportion of unburned hydrocarbons and / or soot. As a result, the power of a coupled to the exhaust gas heat exchanger engine can be optimized, so an optimal heat transfer of the exhaust gas heat exchanger can be ensured.
  • the additives can be incorporated directly into the protective layer.
  • Another preferred embodiment of the heat exchanger is characterized in that the additives are microencapsulated.
  • a further preferred embodiment of the heat exchanger is characterized in that the coating and / or the protective layer comprises nanoparticles.
  • the nanoparticles can increase the adhesion of the protective layer and its resistance to abrasion.
  • the above-described object is achieved by the following step: reacting the coating during operation by the high operating temperature of more than 250 ° C in the protective layer.
  • a heat exchanger provided with the coating will be provided with the protective layer by the first startup of the heat exchanger.
  • the exhaust gas heat exchanger can be provided with the necessary protective layer already after the first startup.
  • the invention relates to an exhaust gas heat exchanger made of aluminum or stainless steel.
  • the exhaust gas heat exchanger has a cavity and / or a channel, which is traversed by exhaust gas during operation of the exhaust gas heat exchanger.
  • the cavity has a coating with a coating material.
  • the coating material may contain catalytically active additives which reduce the proportion of hydrocarbons and soot in the exhaust gas. This will increase the performance of a motor coupled to the exhaust gas heat exchanger positively affects and reduces the performance degradation of the exhaust gas heat exchanger during operation of the engine.
  • additives may be incorporated directly in the coating or may be incorporated in the micro-encapsulated form in the form of microcapsules.
  • the microcapsules may have a depot effect and release the additives or the catalyst over a longer period.
  • the coating material is based on nanotechnology, ie contains nanoparticles. As a result, for example, the adhesion of the coating and its resistance to abrasion can be increased.
  • the coating materials may comprise, for example, polymerisable (or polycondensable) organometallic compounds such as Ti, Zr, Si based organometallic compounds (silanes, siloxanes, silazanes, silicates) such as tretra-n-propoxysilane, zirconium n-propoxide, titanium n-propoxide; Trialkoxysilane, the vinyl, methacrylic or epoxy units and / or their halogenated with fluorine, chlorine, bromine and / or iodine derivatives.
  • organometallic compounds such as Ti, Zr, Si based organometallic compounds (silanes, siloxanes, silazanes, silicates) such as tretra-n-propoxysilane, zirconium n-propoxide, titanium n-propoxide; Trialkoxysilane, the vinyl, methacrylic or epoxy units and / or their halogenated with fluorine, chlorine, bromine and /
  • coating material polymer systems which crosslink at high temperatures and pass by splitting off of low molecular weight compounds in high temperature resistant forms (for example, organic silicone compounds (for example, silicone resins), polyamide-imide paints or the like).
  • high temperature resistant forms for example, organic silicone compounds (for example, silicone resins), polyamide-imide paints or the like).
  • Such systems can be radiation, temperature or chemical curing.
  • additives elements and their compounds from VIII.
  • Subgroup ruthenium, rhodium, palladium, osmium, iridium, platinum
  • the additives may comprise mixed metal oxides of V.VIII subgroup metals, for example, vanadium and / or manganese.
  • the coating material may also comprise particles and / or consist of particles.
  • the particles may, for example, oxides, oxide hydrates, nitrides and / or carbides of main group elements, such as aluminum, silicon, indium, boron, and / or transition metals, preferably the IV and V. subgroup and / or cerium and / or zinc and / or metallic particles of, for example, silicon, aluminum, zirconium, titanium. It is also possible to provide coated and / or grafted particles with the aforementioned substances or compounds.
  • the particles may be metallic particles of the elements and their compounds from subgroup VIII (ruthenium, rhodium, palladium, osmium, iridium, platinum).
  • the particles can have a size between 1 and 50,000 nanometers.
  • the particles Preferably, the particles have a size between 1 and 1,000 nanometers, preferably between 1,000 and 10,000 nanometers, preferably between 10,000 and 50,000 nanometers.
  • microcapsules may contain the substances and / or compounds listed for the additives and particles.
  • the listed coating materials of the coating or the protective layer can be incorporated as a solution in an organic and / or inorganic solvent or as a dispersion in which a chemical compound, in particular salt as a solid, and / or applied as an aerosol, depending on the solubility and the state of aggregation ,
  • the application of the coating material can be carried out by methods available according to the prior art.
  • the coating material can be made by immersion, forced flooding, filling, steaming and / or aerosol exposure. It is possible to use excess coating material by flowing out of the heat exchanger to remove. In addition, it is possible to accelerate the emptying process, for example, by spinning and / or blowing.
  • the protective layer thus applied is dried after application. The drying takes place at temperatures between 60 ° C and 150 ° C, preferably between 80 ° C and 110 ° C. The merely dried layer does not yet have the advantageous properties.
  • the formation of the advantageous layer properties takes place at high temperatures, that is, regardless of the drying process, for example at a later date, take place.
  • the treatment will be effected by the high temperatures during the operation of the heat exchanger, for example during the operation of an associated vehicle.
  • the layer forming at high temperatures has the anti-corrosive properties.
  • the formed protective layer may be partially ceramic and / or difficult to wet, in particular oleophobic.
  • the required temperatures for forming the layer properties are in a range higher than 250 ° C.
  • the protective layers in a temperature range between 250 ° C and 350 ° C, preferably 300 ° C to 1000 ° C, preferably 250 ° C to 500 ° C. , preferably 300 ° C to 700 ° C, preferably 350 ° C to 450 ° C, preferably 400 ° C to 550 ° C, preferably 500 ° C to 700 ° C, are.
  • the heat exchanger may include metals such as aluminum and aluminum alloys. Also suitable are steels, in particular Chromium nickel steels, nickel-based alloys, copper, bronze, brass as well as titanium and titanium alloys.
  • the coating or the layer composition can be adapted to the respective operating temperature of the heat exchanger, in particular the exhaust gas heat exchanger or intercooler.
  • the layer composition can be matched to the material of the heat exchanger.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Catalysts (AREA)
  • Coating With Molten Metal (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Claims (5)

  1. Echangeur de chaleur, en particulier échangeur de chaleur de gaz d'échappement, comprenant au moins une surface en métal, en particulier en aluminium ou en acier spécial, surface qui est sollicitée par un milieu, en particulier des gaz d'échappement, et dotée d'un revêtement, caractérisé en ce que le revêtement, sous l'effet d'une première température de fonctionnement élevée de plus de 250°C, peut être transformé et / ou est transformé en une couche de protection oléophobe résistant à la corrosion, partiellement en céramique et pouvant difficilement être mouillée.
  2. Echangeur de chaleur selon la revendication 1, caractérisé en ce que le revêtement et / ou la couche de protection présente des additifs catalytiquement actifs.
  3. Echangeur de chaleur selon la revendication précédente, caractérisé en ce que les additifs sont microencapsulés.
  4. Echangeur de chaleur selon l'une quelconque des revendications précédentes, caractérisé en ce que le revêtement et / ou la couche de protection présente des nanoparticules.
  5. Procédé de fabrication d'un échangeur de chaleur, en particulier d'un échangeur de chaleur de gaz d'échappement, selon l'une quelconque des revendications précédentes, caractérisé par l'étape suivante consistant :
    - au cours du fonctionnement, sous l'effet de la température de fonctionnement élevée de plus de 250°C, à transformer le revêtement en couche de protection.
EP07022450.6A 2006-11-21 2007-11-20 Echangeur thermique, en particulier échangeur thermique pour gaz d'échappement Ceased EP1925808B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006054723A DE102006054723A1 (de) 2006-11-21 2006-11-21 Wärmetauscher, insbesondere Abgaswärmetauscher

Publications (3)

Publication Number Publication Date
EP1925808A2 EP1925808A2 (fr) 2008-05-28
EP1925808A3 EP1925808A3 (fr) 2013-03-06
EP1925808B1 true EP1925808B1 (fr) 2018-10-03

Family

ID=38893999

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07022450.6A Ceased EP1925808B1 (fr) 2006-11-21 2007-11-20 Echangeur thermique, en particulier échangeur thermique pour gaz d'échappement

Country Status (2)

Country Link
EP (1) EP1925808B1 (fr)
DE (1) DE102006054723A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2399036B1 (es) * 2010-06-28 2014-01-28 Valeo Térmico, S.A. Intercambiador de calor para gases en especial de los gases de escape de un motor.
DE102013100887A1 (de) * 2013-01-29 2014-07-31 Benteler Automobiltechnik Gmbh Leitblech im Wärmetauscher
US20170131046A1 (en) * 2015-11-09 2017-05-11 Electro-Motive Diesel, Inc. Foul-resistant heat exhanger
DE102020203339A1 (de) * 2020-03-16 2021-09-16 Mahle International Gmbh Wärmeübertrager

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3809774A1 (de) * 1987-10-29 1989-10-05 Rennebeck Klaus Verfahren zur abscheidung von russ aus abgasen mit entschwefelung und katalyse
IT1248980B (it) * 1990-06-22 1995-02-11 Nuovo Pignone Spa Scambiatore di calore in rame perfezionato per caldaie murali
DE50200547C5 (de) * 2002-07-31 2007-09-20 Esk Ceramics Gmbh & Co. Kg Keramische Beschichtung für Verbrennungskessel
DE102004013306A1 (de) * 2004-03-17 2005-10-06 Behr Gmbh & Co. Kg Beschichtungsverfahren
WO2006100072A1 (fr) * 2005-03-24 2006-09-28 Behr Gmbh & Co. Kg Echangeur thermique pour gaz d'echappement, notamment refroidisseur de gaz d'echappement pour le recyclage des gaz d'echappement dans les vehicules a moteur

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP1925808A3 (fr) 2013-03-06
EP1925808A2 (fr) 2008-05-28
DE102006054723A1 (de) 2008-05-29

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