EP4259909A2 - Plaque chauffante en céramique utilisée comme élément chauffant - Google Patents

Plaque chauffante en céramique utilisée comme élément chauffant

Info

Publication number
EP4259909A2
EP4259909A2 EP21835605.3A EP21835605A EP4259909A2 EP 4259909 A2 EP4259909 A2 EP 4259909A2 EP 21835605 A EP21835605 A EP 21835605A EP 4259909 A2 EP4259909 A2 EP 4259909A2
Authority
EP
European Patent Office
Prior art keywords
heating element
flow
deflections
section
cross
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.)
Withdrawn
Application number
EP21835605.3A
Other languages
German (de)
English (en)
Inventor
Peter Hirth
Rolf BRÜCK
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.)
Vitesco Technologies GmbH
Original Assignee
Vitesco Technologies GmbH
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 Vitesco Technologies GmbH filed Critical Vitesco Technologies GmbH
Publication of EP4259909A2 publication Critical patent/EP4259909A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
    • F01N3/2889—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices with heat exchangers in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0892—Electric or magnetic treatment, e.g. dissociation of noxious components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/16—Selection of particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
    • F01N3/2026—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means directly electrifying the catalyst substrate, i.e. heating the electrically conductive catalyst substrate by joule effect
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/16—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an electric heater, i.e. a resistance heater
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a device for the aftertreatment of exhaust gases, with a flow path through which exhaust gas can flow, with at least one honeycomb body acting as a catalyst and at least one heating element, the heating element being made of a ceramic material that runs along a plurality of flow channels from an inflow side to an outflow side can be flowed through, the heating element being electrically conductive along the walls delimiting the flow channels.
  • Heating elements are used to heat catalytic converters, for example in the exhaust lines of internal combustion engines, in order to reach the so-called light-off temperature of the catalytic converters at an early stage, from which point the chemical conversion of the exhaust gases functions particularly efficiently.
  • the heating elements are formed, for example, by electrically conductive conductor structures, which are connected to a power source and thus generate heat using the ohmic resistance.
  • heating discs for use in exhaust systems of internal combustion engines are known in the prior art.
  • metallic honeycomb bodies are used, which are formed from a plurality of metallic foils which are stacked and wound up.
  • honeycomb bodies are formed with a plurality of flow channels that can be flowed through, through which the exhaust gas can flow.
  • the heating discs are connected to a voltage source via an electrical connection.
  • heating disks made of ceramic materials which have a metallic conductor which is connected to a voltage source and can be heated using the ohmic resistance.
  • a particular disadvantage of the devices in the prior art is that complex insulation measures have to be taken in order to prevent the current from following an undesired path and causing electrical short circuits.
  • Undesired hot spots can also occur along the heating element if the current flows along the shortest possible path, resulting in sections on the heating element through which the current flows significantly more and are therefore heated than other areas. Hot spots can be disadvantageous, particularly with regard to durability, and non-homogeneous heat distribution over the cross section of the flow-through catalytic converter is also disadvantageous with regard to the efficiency of the catalytic converter.
  • One exemplary embodiment of the invention relates to a device for the aftertreatment of exhaust gases, with a flow section through which exhaust gas can flow, with at least one honeycomb body acting as a catalyst and at least one heating element, the heating element being formed from a ceramic material that runs along a plurality of flow channels from an inflow side can be flowed through to an outflow side, the heating element being electrically conductive along the walls delimiting the flow channels and by means an electrical contact can be connected to a voltage source, the heating element running in a meandering manner over a cross-section of the flow path that can be flowed through.
  • the heating element can preferably be produced from a disk-shaped honeycomb body, which can be produced, for example, by extrusion.
  • the disk-like honeycomb body can be machined, for example, using a machining process, and a desired shape can thus be produced.
  • the heating element is preferably designed in a meandering manner and thus forms a heating section which extends over the cross section of the device for exhaust gas aftertreatment through which flow can take place.
  • the heating element can also be produced by a suitable shaping process as a meandering shaped heating section.
  • the heating element preferably has a structure similar to that of a ceramic honeycomb body of a catalytically active catalyst.
  • a large number of fine channels runs through the honeycomb body from an inflow side to an outflow side, so that the honeycomb body and the heating element as a whole are gas-permeable along a defined main direction.
  • the electrical conductivity of the heating element is achieved by the channel walls delimiting the flow channels.
  • the ceramic can be provided with an electrically conductive coating, for example.
  • metallic particles can be admixed to the ceramic, so that the metallic-ceramic mixture as a whole is electrically conductive.
  • the heating element is particularly well suited to covering as large a part as possible of the cross-section through which flow can take place, in order to achieve heating of the flowing exhaust gas that is as homogeneous and strong as possible.
  • the heating element can be constructed by alternating 180-degree deflections in a row, so that sections of the heating element running parallel to one another are formed.
  • a spiral arrangement of the individual sections of the heating element Mentes are preferred, which are known for example from metallic honeycomb bodies for heating discs in the prior art.
  • the aim is to achieve the largest possible area of coverage of the cross-section through which flow can take place, without individual sections of the heating element coming into electrically conductive contact with one another.
  • the heating element can be arranged entirely in a single plane.
  • the heating element can also be arranged, for example, in two or more planes that are spaced apart from one another. For this purpose, after a deflection, the heating element would run along the main flow direction of the honeycomb body and thus connect the two levels to one another. The heating element can thus also extend along the main flow direction of the honeycomb body.
  • the heating element has a number of deflections within one plane. Deflections through 180 degrees are particularly advantageous in order to achieve the best possible utilization of the available cross-sectional area of the honeycomb body and thus generate the highest possible heating output.
  • the heating element is formed of a ceramic honeycomb body.
  • a heating element which is formed from a disc-shaped honeycomb body by a machining process is particularly advantageous.
  • the heating element has a cross-sectional thickening of the electrically conductive structure at the deflections compared to the remaining areas of the heating element.
  • the electrically conductive structure is formed by the channel walls.
  • more channel walls can be arranged in sections per unit area, for example, or the thickness of the channel walls can be increased in sections.
  • the porosity of the channel walls can be different. High porosity allows more air per Unit volume bound in the material, resulting in less conductive material there overall. Decreased porosity thus results in more material per unit volume, which means there is relatively more material there.
  • a material thickening in the area of the deflections is advantageous in order to avoid the occurrence of so-called hotspots or hot spots. Due to the material thickening, there is locally more material through which the current can flow along the heating element. The heat generated at the heating element is thus distributed over more mass, which reduces the maximum local heating.
  • the cross-sectional thickening of the electrically conductive structure can also be formed to different extents over the cross-section of the heating element, so that, for example, areas that are close to the inner, smaller radius of curvature in the area of the deflection experience a smaller cross-sectional thickening, or even a cross-sectional reduction. while areas that are close to the outer larger radius of curvature in the area of the deflection experience a greater cross-sectional thickening.
  • This can be advantageous in particular in order to influence the current flow along the heating element in a targeted manner and thus to avoid the occurrence of hot spots due to an increased current flow.
  • a preferred exemplary embodiment is characterized in that the heating element has a different thermal conductivity over the cross section of the heating element in the areas of the deflections than in the sections before and after the deflections.
  • a reduced thermal conductivity can be produced, for example, by a special choice of material, for example by making the areas of the deflections from a different material than the rest of the heating element.
  • the base material of the heating element for example in the area of the deflections be mixed with another material or with another element.
  • the thermal conductivity at the inner edge of the deflection, adjacent to the smaller radii of curvature, is preferably different than at the outer edge of the deflection, adjacent to the larger radii of curvature.
  • the thermal conductivity can be designed in such a way that the occurrence of hot spots, particularly in the area of the smaller radii of curvature, is reduced.
  • the thermal conductivity can be influenced, among other things, by the choice of material, the porosity, the cross-sectional area of the heating element or the number and thickness of the channel walls.
  • the heating element has a different heat capacity over the cross section of the heating element in the areas of the deflections than in the sections before and after the deflections.
  • the local generation of a higher heat capacity also counteracts the development of local hot spots, which means that a more homogeneous heat distribution is achieved overall.
  • the heat capacity generated by the selection of the parameters in the area of the smaller radii of curvature is preferably different from the heat capacity in the area of the larger radii of curvature.
  • the heating element has a different electrical resistance over the cross section of the heating element in the areas of the deflections.
  • the specific electrical resistance can also be influenced by the material properties already mentioned.
  • the specific electrical resistance is also adjusted over the cross section of the heating element, so that the occurrence of hot spots is reduced or completely avoided.
  • the heating element preferably has a higher electrical resistance in the area of the smaller or narrower radii of curvature than in the area of the larger or wider radii of curvature.
  • the proportion of electrically conductive material per unit area is different in some areas. In this way, particularly well conductive areas and less well conductive areas can be produced within the heating element. In this way, the flow of current along the heating element can be advantageously influenced.
  • FIG. 1 is a top view of a heating element which is arranged on one of the end faces of a heating disk formed by a honeycomb body,
  • FIG. 2 shows a top view of a deflection area of the heating element, the cell density in the area of the deflection being higher than in the rest of the heating element,
  • FIG. 3 shows a plan view of a deflection area of the heating element, the walls delimiting the flow channels being thicker in the area of the deflection than in the rest of the heating element, and FIG
  • FIG. 4 shows a plan view of a deflection area of the heating element, the walls delimiting the flow channels being formed in sections from a material with different material properties.
  • FIG. 1 shows a flow cross section 1 of the device for exhaust gas aftertreatment in a schematically indicated manner.
  • a heating element 2 is arranged, which has a plurality of flow channels Baren flow through which can be flowed along a main flow direction, which is parallel to a surface normal on the plane of the drawing.
  • the individual flow channels are delimited by walls in a direction transverse to the main flow direction.
  • the heating element 2 is made of a ceramic material, it is either provided with an electrically conductive surface coating or has a certain proportion of electrically conductive material.
  • the ceramic can be mixed with metallic particles, for example, in order to generate sufficient electrical conductivity.
  • the heating element 2 is heated by energizing the heating element 2.
  • the heating element 2 can be connected at the end via electrical contacts 3 to a voltage source. Using the ohmic resistance, the heating element 2 is thus heated if current flows through the heating element 2 .
  • the meandering heating element 2 in the exemplary embodiment in FIG. 1 can be produced, for example, by a machining process from a honeycomb body designed as a disc.
  • the heating element 2 is arranged in a meandering manner over the cross section 1 of the catalytic converter that is upstream or downstream in the direction of flow (not shown in FIG. 1). Arrangements deviating from this can also be provided in order to optimally utilize the cross-sectional area of the catalytic converter and to ensure the best possible heat transfer and the most homogeneous heat generation possible. Deviating from the exemplary embodiment in FIG. 1, the heating element can also run in a direction which follows a surface normal on the plane of the drawing. This is particularly important in the case of a heating element arranged in several levels one behind the other.
  • the heating element 2 has a plurality of deflection areas 4 in which it changes its direction. These deflection areas 4 are preferably designed in such a way that the generation of local hot spots is avoided or at least significantly reduced.
  • the deflection area 4 can be thickened, for example, have a reduced porosity compared to the rest of the heating element 2, have a lower thermal conductivity or have an increased thermal capacity.
  • the material used or the wall thickness can also vary over the cross section of the deflection area 4 .
  • FIG. 2 shows a detailed view of a deflection area 4, with a greater cell density being provided in the curved area 6 of the deflection 4 in comparison to the remaining structure 5 of the heating element 2.
  • the area 6 has more flow channels per unit area than the rest of the heating element 2.
  • Figure 3 shows an alternative embodiment of the deflection area 7, the existing walls in the curved area 8 of the deflection 7, which delimit the flow channels, have a greater wall thickness than in the remaining structure 5 of the heating element 2.
  • the increased wall thickness also increases the electrical Conductivity affected.
  • FIG. 4 shows a further alternative embodiment of a deflection area 9, the walls delimiting the flow channels being formed from different materials in the curved area 10 of the deflection 9.
  • FIG. The walls arranged in the area 11 of the smaller inner radius are formed from a first material, while the walls arranged in the area 12 of the larger outer radius are formed from a second material.
  • the materials can differ from one another in particular in terms of the specific electrical resistance, the metal content, the porosity, the surface coating or a combination of the aforementioned properties.
  • the aim is in particular to produce a suitable influencing of the current flow within the heating element 2 in order to avoid the occurrence of local hot spots.
  • the specific resistance can be adjusted in particular areas in order to locally limit or promote the flow of current.
  • the changes described above can also directly influence the thermal conductivity of the heating conductor, which means that heat can be better dissipated and can be distributed, which can also reduce the occurrence of hot spots.
  • FIGS. 1 to 4 in particular do not have any restrictive character and serve to clarify the idea of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Catalysts (AREA)
  • Incineration Of Waste (AREA)

Abstract

L'invention concerne un dispositif de post-traitement de gaz d'échappement, comprenant une voie d'écoulement pouvant être parcourue par les gaz d'échappement et pourvue d'au moins un corps en nid d'abeilles (1) servant de catalyseur et d'au moins un élément chauffant (2), l'élément chauffant (2) étant constitué d'un matériau céramique qui peut être parcouru le long d'une pluralité de canaux d'écoulement d'un côté entrée à un côté sortie, l'élément chauffant (2) étant électroconducteur le long des parois délimitant les canaux d'écoulement et pouvant être relié à une source de tension au moyen d'un contact électrique (3), l'élément chauffant (2) s'étendant en forme de méandres sur une section transversale du trajet d'écoulement pouvant être parcourue.
EP21835605.3A 2020-12-11 2021-12-01 Plaque chauffante en céramique utilisée comme élément chauffant Withdrawn EP4259909A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020215753.7A DE102020215753B4 (de) 2020-12-11 2020-12-11 Keramische Heizscheibe als Heizelement
PCT/EP2021/083848 WO2022122516A2 (fr) 2020-12-11 2021-12-01 Plaque chauffante en céramique utilisée comme élément chauffant

Publications (1)

Publication Number Publication Date
EP4259909A2 true EP4259909A2 (fr) 2023-10-18

Family

ID=79185421

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21835605.3A Withdrawn EP4259909A2 (fr) 2020-12-11 2021-12-01 Plaque chauffante en céramique utilisée comme élément chauffant

Country Status (5)

Country Link
US (1) US12085003B2 (fr)
EP (1) EP4259909A2 (fr)
CN (1) CN116917601A (fr)
DE (1) DE102020215753B4 (fr)
WO (1) WO2022122516A2 (fr)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5519191A (en) * 1992-10-30 1996-05-21 Corning Incorporated Fluid heater utilizing laminar heating element having conductive layer bonded to flexible ceramic foil substrate
US5526462A (en) * 1993-03-22 1996-06-11 Ngk Insulators, Ltd. Honeycomb heater with mounting means preventing axial-displacement and absorbing radial displacement
DE4339686C1 (de) 1993-11-22 1994-11-03 Daimler Benz Ag Elektrisch beheizbarer Abgaskatalysator
US5536478A (en) * 1994-12-01 1996-07-16 Corning Incorporated Electrical leads for a fluid heaters
US5749223A (en) * 1996-03-06 1998-05-12 General Motors Corporation Exhaust management system
DE19943846A1 (de) * 1999-09-13 2001-03-15 Emitec Emissionstechnologie Vorrichtung mit Heizelement zur Abgasreinigung
DE102012109391A1 (de) * 2012-10-02 2014-04-03 Emitec Gesellschaft Für Emissionstechnologie Mbh Elektrisch beheizbarer, aus keramischem Material extrudierter Wabenkörper
FR3065027B1 (fr) * 2017-04-07 2019-11-29 Faurecia Systemes D'echappement Dispositif de purification des gaz d'echappement d'un vehicule et procede de pilotage correspondant
DE102017124276A1 (de) 2017-10-18 2019-04-18 Eberspächer Exhaust Technology GmbH & Co. KG Mischanordnung

Also Published As

Publication number Publication date
US20240102411A1 (en) 2024-03-28
WO2022122516A2 (fr) 2022-06-16
CN116917601A (zh) 2023-10-20
DE102020215753B4 (de) 2022-07-21
WO2022122516A3 (fr) 2022-08-04
US12085003B2 (en) 2024-09-10
DE102020215753A1 (de) 2022-06-15

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