WO2020152138A1 - Système de retraitement de gaz d'échappement pour un moteur à combustion interne - Google Patents

Système de retraitement de gaz d'échappement pour un moteur à combustion interne Download PDF

Info

Publication number
WO2020152138A1
WO2020152138A1 PCT/EP2020/051365 EP2020051365W WO2020152138A1 WO 2020152138 A1 WO2020152138 A1 WO 2020152138A1 EP 2020051365 W EP2020051365 W EP 2020051365W WO 2020152138 A1 WO2020152138 A1 WO 2020152138A1
Authority
WO
WIPO (PCT)
Prior art keywords
exhaust gas
coating
aftertreatment system
gas aftertreatment
heating element
Prior art date
Application number
PCT/EP2020/051365
Other languages
German (de)
English (en)
Inventor
Stephan Kellner
Marcus Lücking
Ekkehard Pott
Nicola SÖGER
Wulf Hauptmann
Original Assignee
Volkswagen Ag
Umicore Ag & 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 Volkswagen Ag, Umicore Ag & Co. Kg filed Critical Volkswagen Ag
Publication of WO2020152138A1 publication Critical patent/WO2020152138A1/fr

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
    • F01N3/02—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
    • F01N3/033—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 in combination with other devices
    • F01N3/035—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 in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • 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
    • F01N13/009—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 having two or more separate purifying devices arranged in series
    • 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
    • F01N13/009—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 having two or more separate purifying devices arranged in series
    • F01N13/0093—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 having two or more separate purifying devices arranged in series the purifying devices are of the same type
    • 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
    • F01N3/08—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
    • F01N3/103—Oxidation catalysts for HC and CO only
    • 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
    • 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
    • F01N3/2066—Selective catalytic reduction [SCR]
    • 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
    • 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
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • 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
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/60—Discontinuous, uneven properties of filter material, e.g. different material thickness along the longitudinal direction; Higher filter capacity upstream than downstream in same 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
    • F01N2370/00—Selection of materials for exhaust purification
    • F01N2370/02—Selection of materials for exhaust purification used in catalytic reactors
    • F01N2370/04—Zeolitic material
    • 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
    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • F01N2510/063—Surface coverings for exhaust purification, e.g. catalytic reaction zeolites
    • 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
    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • F01N2510/068—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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 an exhaust gas aftertreatment system for internal combustion engines and a vehicle with such an exhaust gas aftertreatment system.
  • Exhaust gas aftertreatment system with a uniform oxidation catalytic converter and a downstream device for selective reduction, an electrical heating element for exhaust gas heating being positioned upstream.
  • the invention is based on the object of enabling high conversion rates and thus reducing exhaust gas emissions, in particular at low temperatures, during the cold start and heating phase of the internal combustion engine.
  • an exhaust gas aftertreatment system for an internal combustion engine includes one
  • the exhaust gas aftertreatment system comprises a device for selective catalytic reduction which is arranged downstream relative to the oxidation catalytic converter and which is equipped with the oxidation catalytic converter for carrying out the exhaust gas
  • the exhaust aftertreatment system includes one relative to the device for selective catalytic reduction downstream particle filter, which with the device for selective catalytic reduction for
  • Carrying the exhaust gas is fluid. This also includes
  • Exhaust gas aftertreatment system an electrical heating element set up for heating the exhaust gas, which is positioned in such a way to heat at least part of the oxidation catalytic converter.
  • the oxidation catalyst comprises at least two spatially separate coating sections with different coatings.
  • the oxidation catalyst is preferably a diesel oxidation catalyst.
  • a urea-water solution HWL
  • the term spatial separation means that the sections do not overlap, but can contact each other.
  • the heating element is preferably designed as a heating disk, the invention being not restricted to this.
  • the heating disk can be part of an electrical catalyst. Electrical heating heats up at least part of the oxidation catalytic converter.
  • the light-off temperature for carbon monoxide (CO) and hydrocarbons (HC) can be reached in a short time.
  • nitrogen monoxide (NO) is converted to nitrogen dioxide (N0 2 ) more quickly, so that a ratio of 1: 1 can be achieved earlier or even an excess of N02 over NO can be achieved.
  • the advantage of the invention sometimes lies in the fact that the combination of heating on the one hand and the various coatings enables the NO / NO 2 ratio of about 1: 1 to be formed more quickly and also at a comparatively low exhaust gas temperature, and also the oxidation of carbon monoxide and Hydrocarbons can be improved by coatings.
  • pure Pt coatings or Pt-Pd coatings with a ratio of 20: 1 to 1: 1, preferably 10: 1 to 2: 1, ideally 5: 1 to 3: 1, are to be used as noble metals.
  • Pt and Pd coatings are particularly effective in oxidizing HC and CO, while pure Pt coatings are particularly effective in oxidizing NO to N02.
  • the preferred precious metal loading is 10 to 200 g / ft 3 , particularly 30 to 130 g / ft 3 , ideally 40 to 100 g / ft 3 , perfectly 60 to 80 g / ft 3 .
  • the heating of the exhaust gas and its current path also transfers heat to the device for selective catalytic reduction.
  • This enables the urea-water solution to be released earlier after a cold engine start.
  • the particle filter is also heated earlier, so that NO x emissions can be reduced quickly and effectively.
  • the heating in combination with the different coating can advantageously be used to obtain an optimized NO / N0 2 ratio.
  • the improved NO / N0 2 ratio, processed NH 3 and warm particle filter make it possible to improve the overall conversion in a downstream catalytic converter or in a
  • the electric heating element is positioned upstream relative to the oxidation catalyst. This can influence the heating of the subsequent route, in particular the
  • Oxidation catalyst to achieve the HC-CO light-off and setting the N0 / N0 2 ratio are taken.
  • the position and the coatings used can also be optimized here.
  • the electrical heating element is integrated in the oxidation catalytic converter.
  • An electrically heated catalytic converter (E-cat) is formed with the integrated heating element. The heating element can then specifically heat a specific part of the oxidation catalytic converter.
  • the electrical heating element is between two
  • Coating sections positioned with different coatings can be specifically heated.
  • the heating element moves closer to the device for selective catalytic reduction and to the particle filter, so that they are also better heated.
  • the coating of the coating section positioned downstream relative to the electrical heating element is designed to convert nitrogen monoxide into nitrogen dioxide and / or that the coating of the coating section positioned upstream relative to the electrical heating element
  • Coating section is formed such, hydrocarbons and / or
  • a desired ratio of N0 / N0 2 of approximately 1: 1 can thus be generated relatively quickly even at low exhaust gas temperatures, for example at 150-250 ° C.
  • the particle filter has at least two spatially separated coating sections, the coating sections having a different coating for selective reduction.
  • the multiple coatings can now be designed such that these interact optimally with the heated and divided oxidation catalyst.
  • coatings can be formed for a first coating section, which is positioned upstream, which have a good turnover with a good NO / NO 2 ratio, that is to say close to 1, and rather lower temperatures, for example at 150-250 ° C. .
  • a first coating section positioned upstream has iron zeolite as a coating for selective reduction and / or a second coating section positioned downstream as a coating for selective reduction has copper zeolite.
  • Iron zeolite has a very good NO x reduction at low exhaust gas temperatures of, for example, 150 to 250 ° C. under the condition of a very good NO / NO 2 ratio, as is indicated by the
  • Copper zeolite is particularly stable to aging and rather insensitive to different N0 / N0 2 ratios. The combination exploits both advantages, in particular the high sales due to the iron zeolite.
  • volume ratio of the first coating section to the second coating section is between 10:90 and 40:60, in particular between 20:80 and 30:70 or at 25:75.
  • the second coating section with age-resistant copper zeolite continues to be the main part of the particle filter, with the smaller coated iron zeolite achieving high conversions in the low temperature range and with a good NO / N0 2 ratio in the range around 1: 1.
  • a precise division is part of the optimization process of the
  • Particle filter a catalyst is positioned for selective catalytic reduction. This eliminates the need for coating or zoning in sections and simplifies the system.
  • the material, cell number, cell shape and wall thickness of the catalyst can differ from that of the particle filter, so that a
  • the catalyst for selective catalytic reduction is coated with iron zeolite and the particle filter with Copper zeolite is coated.
  • iron zeolite which has a very good NO x reduction at low exhaust gas temperatures of, for example, 150 to 250 ° C under the condition of a very good NO / NO 2 ratio, as is the case with the upstream heated oxidation catalyst is produced.
  • Copper zeolite on the other hand, is particularly stable to aging and rather insensitive to different NO / N0 2 ratios.
  • the volume ratio can be as in the case of the particle filter divided into coating sections, that is to say between 10:90 and 40:60, in particular between 20:80 and 30:70 or at 25:75.
  • the catalyst for the selective catalytic reduction has a mass which is more than 10, 20, 30 or 50% below the total mass of the catalyst for the selective catalytic reduction and particle filter. This means that with an assumed volume distribution of 25:75, the mass fraction of the catalyst is 22.5; 20; 17.5; 12.5% of the total mass of the catalyst and particle filter. In the interest of a quick light-off, a low thermal inertia of the upstream iron-zeolite catalyst is thereby advantageously achieved.
  • vehicles with a diesel engine and NO x tailpipe emissions do not exceed 35; 30; 25; 20; 15; 10 mg / km in the WLTP cycle a specific precious metal sum loading of platinum (Pt) and palladium (Pd) of the upstream
  • FIG. 1 shows an exhaust gas aftertreatment system according to a first embodiment of the
  • FIG. 2 shows an exhaust gas aftertreatment system according to a second embodiment of the
  • FIG. 1 shows an exhaust gas aftertreatment system 1 for an internal combustion engine according to a first exemplary embodiment of the invention.
  • the exhaust gas aftertreatment system 1 comprises an oxidation catalytic converter 10. This is in particular a
  • the oxidation catalytic converter 10 is connected, for example, to an exhaust gas duct 5, on which an exhaust gas inlet 3 is provided.
  • exhaust gas from an internal combustion engine (not shown here), in particular a diesel engine, can thus enter exhaust gas aftertreatment system 1 via
  • a device for selective catalytic reduction 20 is arranged downstream of the oxidation catalytic converter 10.
  • the direction of flow of the exhaust gas flow path is shown by arrows in FIG. 1 as well as in the following FIG.
  • the device for the selective catalytic function is fluidly connected to the oxidation catalytic converter 10 for carrying out the exhaust gas.
  • the device points to selective
  • Dosing valve 22 can be supplied to the flowing exhaust gas, a urea-water solution 24. Furthermore, a mixer 26 is provided as an example, which is opposite the
  • Metering valve 22 is positioned downstream and is set up to mix or homogenize the urea-water solution 24 with the exhaust gas. Exhaust gas and urea-water solution 24 mix on a mixing section 28, in particular downstream of the mixer 26, in order to be able to initiate or initiate the desired chemical reactions.
  • a particle filter 30 is positioned downstream, which is fluidly connected to the device for selective catalytic reduction 20 for carrying out the exhaust gas.
  • the particulate filter 30 is located downstream of the mixer 20.
  • the particulate filter is, in particular, a diesel particulate filter, more preferably a coated diesel particulate filter.
  • An exhaust gas duct 5 and an exhaust gas outlet 7 are also connected to the particle filter 30 by way of example.
  • the oxidation catalytic converter 10 comprises at least two spatially
  • the different coatings and the coating sections 12, 16 in combination with the electrical heating element 14 have the advantage of an optimized NO / NO 2 ratio in the range of 1: 1 even at comparatively low levels
  • a heating disk is used as the heating element 14, the invention being not restricted to this.
  • support pins 18 are provided for supporting the heating disk on the catalytic converter, this being only a special embodiment and the invention not being restricted thereto.
  • the electrical heating element 14 is within the
  • Oxidation catalyst 10 integrated in order to achieve specific heating of certain areas.
  • the heating element 14 can also be positioned upstream of the oxidation catalytic converter 10, so that the following route areas are warmed up, in particular the oxidation catalytic converter 10 and in particular then the first coating section 12.
  • the heating element 14 is positioned between two coating sections 12, 16 with a different coating, as a result of which the second coating section 16 positioned downstream is heated particularly quickly.
  • the heating element 14 can be controlled, for example, after starting the engine with a voltage of, for example, 12 V or preferably 48 V at 0.5 kW to 10 kW, more preferably at 1 kW to 4 kW of power.
  • the second coating section 16 positioned downstream may then, for example, reach the CO or HC light-off in 80 s to 150 s and the conversion of NO into NO 2 begins.
  • the coating of the second coating section 16 which is positioned downstream relative to the electrical heating element 14, is designed to convert nitrogen monoxide into nitrogen dioxide.
  • the coating of the first coating section 12 positioned upstream relative to the electrical heating element 14 is also embodied here in an advantageous manner,
  • Oxidize hydrocarbons and / or carbon monoxide In combination with the
  • Heating element 14 can thus produce a fast NO / NO 2 ratio of approximately 1.
  • the heat generated is also quickly transferred to the SCR device 20, so that the urea-water solution is released early. In the control described above, for example, this can be achieved after approx. 50 s to 180 s.
  • the particle filter 30 has two coating sections 32, 34 which are spatially separated from one another.
  • Coating sections 32, 34 have a different coating for selective reduction. These are specifically aimed at those that are rather low
  • a first coating section 32 positioned upstream can be used
  • Iron zeolite has a very good NO x reduction at low exhaust gas temperatures of, for example, 150 to 250 ° C. under the condition of a very good NO / NO 2 ratio, as is generated by the upstream heated oxidation catalytic converter 10.
  • Copper zeolite is particularly stable to aging and rather insensitive to different NO / N0 2 ratios. The combination exploits both advantages, in particular high sales due to the iron zeolite at rather low temperatures.
  • the invention is not limited to the choice of material.
  • FIG. 2 shows an exhaust gas aftertreatment system 1 for an internal combustion engine according to a second exemplary embodiment of the invention.
  • the exhaust gas aftertreatment system 1 differs only in the components downstream from the device for selective catalytic reduction 20, so that only these differences are dealt with in the description.
  • a catalytic converter for selective catalytic reduction 40 is positioned in the flow path of the exhaust gas between the device for selective catalytic reduction 20 and the particle filter 30.
  • the SCR catalytic converter 40 is coated with iron zeolite as an example.
  • the particle filter 30 is also coated with copper zeolite.
  • the SCR catalytic converter 40 therefore has a first coating and the particle filter 30 has a second coating, the first coating and the second coating differing from one another.
  • the first coating of the SCR catalytic converter 40 can be set up to achieve a good conversion in the low temperature range, that is to say at 150 ° -250 ° C.
  • the volume ratio can be selected as in FIG. 1 for the double-coated particle filter 30, for example between 10:90 and 40:60, in particular between 20:80 and 30:70 or 25:75.
  • a section-wise coating or zoning can be dispensed with and the system can thus be simplified.
  • the material, cell number, cell shape and wall thickness of the catalyst can differ from that of the particle filter, so that a
  • the catalyst for selective catalytic reduction 40 preferably has a mass which is more than 10, 20, 30 or 50% below the total mass of catalyst for selective catalytic reduction 40 and particle filter 30.
  • Mass fraction is achieved a quick light-off with low thermal inertia.
  • the advantages of the iron zeolite are exploited, which has a very good NO x reduction at low exhaust gas temperatures of, for example, 150 to 250 ° C. under the condition of a very good NO / NO 2 ratio, as is the case with the heated one upstream
  • Oxidation catalyst is generated.
  • the SCR catalytic converter 40 preferably has a mass which is more than 10, 20, 30 or 50% below the total mass of the SCR catalytic converter 40 and the particle filter 30. This means that with an assumed volume distribution of 25:75, the mass fraction of the catalyst is 22.5; 20; 17.5; 12.5% of the total mass of the catalyst and particle filter. This will in the interest of a fast light-off, a low thermal inertia of the upstream SCR catalytic converter 40 is advantageously achieved.
  • SCR device Selective catalytic reduction device

Landscapes

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

Abstract

L'invention concerne un système de retraitement de gaz d'échappement (1) pour un moteur à combustion comprenant un catalyseur d'oxydation (10), un dispositif pour la réduction catalytique sélective (20) disposé en aval du catalyseur d'oxydation (10), lequel est relié en écoulement au catalyseur d'oxydation (10) pour le passage d'un gaz d'échappement et un filtre à particules (30) disposé en aval du dispositif pour la réduction catalytique sélective (20), lequel est relié en écoulement au dispositif pour la réduction catalytique sélective (20) pour le passage du gaz d'échappement. Un élément chauffant (14) électrique configuré pour chauffer le gaz d'échappement est en outre prévu, et lequel est positionné de façon à chauffer au moins une partie du catalyseur d'oxydation (10). Le catalyseur d'oxydation (10) comprend au moins deux sections de revêtement (12, 16) séparées l'une de l'autre dans l'espace, présentant un revêtement différent l'un de l'autre.
PCT/EP2020/051365 2019-01-22 2020-01-21 Système de retraitement de gaz d'échappement pour un moteur à combustion interne WO2020152138A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019101486.7 2019-01-22
DE102019101486.7A DE102019101486A1 (de) 2019-01-22 2019-01-22 Abgasnachbehandlungssystem für einen Verbrennungsmotor

Publications (1)

Publication Number Publication Date
WO2020152138A1 true WO2020152138A1 (fr) 2020-07-30

Family

ID=69185603

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2020/051365 WO2020152138A1 (fr) 2019-01-22 2020-01-21 Système de retraitement de gaz d'échappement pour un moteur à combustion interne

Country Status (2)

Country Link
DE (1) DE102019101486A1 (fr)
WO (1) WO2020152138A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008013777B4 (de) 2007-03-14 2011-04-14 GM Global Technology Operations, Inc., Detroit Abgasanlage und Verfahren zum Betreiben derselben
DE102011112877A1 (de) * 2010-09-13 2012-03-15 Gm Global Technology Operations Llc, ( N.D. Ges. D. Staates Delaware) Abgasnachbehandlungssystem und Betriebsverfahren
WO2014160289A1 (fr) * 2013-03-14 2014-10-02 Basf Corporation Système de catalyseur de réduction catalytique sélective
DE102015100986A1 (de) * 2014-01-23 2015-07-23 Johnson Matthey Public Limited Company Dieseloxidationskatalysator und Abgassystem
DE102015013284A1 (de) 2015-10-13 2017-04-13 Daimler Ag Verfahren zum Betreiben eines Fahrzeugs und Fahrzeug
EP3418518A1 (fr) * 2017-06-21 2018-12-26 Volkswagen Aktiengesellschaft Système de retraitement des gaz d'échappement et procédé de retraitement des gaz d'échappement d'un moteur à combustion interne

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140311123A1 (en) * 2013-04-19 2014-10-23 GM Global Technology Operations LLC Electrically heated doc using hcscr cold start nox controls
GB201405868D0 (en) * 2014-04-01 2014-05-14 Johnson Matthey Plc Diesel oxidation catalyst with NOx adsorber activity

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008013777B4 (de) 2007-03-14 2011-04-14 GM Global Technology Operations, Inc., Detroit Abgasanlage und Verfahren zum Betreiben derselben
DE102011112877A1 (de) * 2010-09-13 2012-03-15 Gm Global Technology Operations Llc, ( N.D. Ges. D. Staates Delaware) Abgasnachbehandlungssystem und Betriebsverfahren
WO2014160289A1 (fr) * 2013-03-14 2014-10-02 Basf Corporation Système de catalyseur de réduction catalytique sélective
DE102015100986A1 (de) * 2014-01-23 2015-07-23 Johnson Matthey Public Limited Company Dieseloxidationskatalysator und Abgassystem
DE102015013284A1 (de) 2015-10-13 2017-04-13 Daimler Ag Verfahren zum Betreiben eines Fahrzeugs und Fahrzeug
EP3418518A1 (fr) * 2017-06-21 2018-12-26 Volkswagen Aktiengesellschaft Système de retraitement des gaz d'échappement et procédé de retraitement des gaz d'échappement d'un moteur à combustion interne

Also Published As

Publication number Publication date
DE102019101486A1 (de) 2020-07-23

Similar Documents

Publication Publication Date Title
EP3418518B1 (fr) Système de retraitement des gaz d'échappement et procédé de retraitement des gaz d'échappement d'un moteur à combustion interne
EP2326807B1 (fr) Système d'épuration des gaz d'échappement pour moteur diesel
EP2057360B1 (fr) Procédé et dispositif de mise à disposition d'un flux gazeux contenant un agent réducteur
EP3406873B1 (fr) Système de traitement de gaz d'échappement pour un moteur à combustion interne
DE60306305T2 (de) Bimodales Harnstoff-SCR-Katalysatorsystem zur verbesserten NOx Umwandlung und erhöhter Lebensdauer
DE4342652B4 (de) Honigwabenförmige Heizeinrichtung
EP2310113B1 (fr) Système d'épuration de gaz d'échappement pour des moteurs diesel de véhicules utilitaires
WO2014086440A1 (fr) Mélangeur de retraitement de gaz d'échappement
EP3652420B1 (fr) Système et méthode pour post-traitement des gaz d'échappement d'un moteur à combustion interne
EP1212521A1 (fr) Dispositif dote d'un element chauffant et destine a l'epuration des gaz d'echappement
DE2230663A1 (de) Katalytischer Konverter mit elektrisch vorerhitztem Katalysator
EP2904228B1 (fr) Dispositif d'épuration des gaz d'échappement
DE102015204296A1 (de) Kompaktes zylindrisches SCR-System zur Reduktion von Stickstoffoxiden im sauerstoffreichen Abgas von Verbrennungsmotoren mit 500 bis 4500 kW
DE102019101679A1 (de) Abgasheizelement
DE102019209304A1 (de) Vorrichtung zur Abgasnachbehandlung
EP4023864B1 (fr) Unité électrique de chauffage pour gaz d'échappement
WO2020152138A1 (fr) Système de retraitement de gaz d'échappement pour un moteur à combustion interne
WO2020182705A1 (fr) Dispositif de post-traitement de gaz d'échappement et procédé de fonctionnement du dispositif
DE102005057666A1 (de) Vorrichtung und Verfahren zur thermischen Behandlung eines Abgasstroms
EP3388646B1 (fr) Système d'échappement pour un moteur à combustion interne ainsi qu'un moteur à combustion interne
DE102004046918A1 (de) Vorrichtung zur Umwandlung unerwünschter Bestandteile von Abgasen
AT500737B1 (de) Abgasstrang einer brennkraftmaschine
DE102019115155A1 (de) Abgasnachbehandlungssystem sowie Verfahren zur Abgasnachbehandlung eines Verbrennungsmotors
DE102019110992A1 (de) Verfahren zur Abgasnachbehandlung eines Verbrennungsmotors sowie Abgasnachbehandlungssystem
DE102017010267A1 (de) Verbrennungsmotor, insbesondere Dieselmotor, mit Abgasnachbehandlung

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20701449

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 20701449

Country of ref document: EP

Kind code of ref document: A1