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.
• temperature-resistant coatings can be used.
• 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 of 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 high temperature, in particular a first-time high operating temperature, in a corrosion-resistant, partially ceramic and / or difficult to be wetted, in particular oleophobic, protective layer feasible and / or implemented.
• the coating can thus be advantageously applied as an inner coating on the exhaust side before the first use of the heat exchanger.
• this coating can be implemented by a high temperature in the necessary protective layer. This can happen, for example, before the first startup in an oven. However, it is also possible to first deliver the heat exchanger with the unreacted coating and assemble.
• 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 that occurs.
• a preferred embodiment of the heat exchanger is characterized in that the coating and / or the protective layer has catalytically active additives.
• this can reduce the proportion of unburned hydrocarbons and / or soot.
• 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.
• 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.
• a heat exchanger provided with the coating can be provided with the protective layer by a simple temperature treatment, particularly advantageously only by the first startup of the heat exchanger.
• a preferred embodiment of the method is characterized by the following step: reacting the coating in an oven. Through the implementation in an oven, a uniformly high temperature, ie a uniform conversion of the coating can be achieved.
• Another preferred embodiment of the method is characterized by the following step: Implementation when first reaching the high operating temperature.
• the exhaust gas heat exchanger can be provided with the necessary protective layer already after the first startup.
• a further exemplary embodiment of the method is characterized by the following step: Reaction of the coating in a corrosion-resistant, partially ceramic and / or difficultly wettable, in particular oleophobic, protective layer.
• 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.
• These 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 can be carried out by the high temperatures during operation of the heat exchanger, for example during operation of an associated vehicle.
• it is also possible to carry out a separate heat treatment at high temperatures for example in an oven and / or by acting on the heat exchanger with a hot medium, for example with hot air.
• a compression of the coating, or a reaction of the coating in the protective layer ie, a reaction of the previously applied and dried coating material can be achieved.
• 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.

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

Applications Claiming Priority (1)

Publications (3)

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Cited By (4)

Family Cites Families (5)

• 2006
  • 2006-11-21 DE DE102006054723A patent/DE102006054723A1/de not_active Withdrawn
• 2007
  • 2007-11-20 EP EP07022450.6A patent/EP1925808B1/fr not_active Ceased

Non-Patent Citations (1)

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