EP3610141A1 - Système d'échappement - Google Patents

Système d'échappement

Info

Publication number
EP3610141A1
EP3610141A1 EP18715624.5A EP18715624A EP3610141A1 EP 3610141 A1 EP3610141 A1 EP 3610141A1 EP 18715624 A EP18715624 A EP 18715624A EP 3610141 A1 EP3610141 A1 EP 3610141A1
Authority
EP
European Patent Office
Prior art keywords
flow direction
scr
catalyst
scr catalyst
exhaust system
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Withdrawn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
EP18715624.5A
Other languages
German (de)
English (en)
Inventor
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 EP3610141A1 publication Critical patent/EP3610141A1/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Withdrawn legal-status Critical Current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
    • F01N3/18—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
    • 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
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • 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
    • F01N13/0097—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 arranged 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
    • F01N3/02—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
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • 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
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106—Auxiliary oxidation catalysts
    • 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
    • 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
    • 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
    • F01N2240/40—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 a hydrolysis catalyst
    • 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
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/04—Filtering activity of 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
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/22—Monitoring or diagnosing the deterioration of exhaust systems of electric heaters for exhaust systems or their power supply
    • 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
    • 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 system for the aftertreatment of exhaust gases of an internal combustion engine with successively arranged viewed in the flow direction of the exhaust gas, a catalyst for the oxidation of the exhaust gas and / or a catalyst for
  • catalysts are used, for example, which absorb and bind nitrogen oxides (NO x ).
  • NO x nitrogen oxides
  • catalysts are also known which stimulate a conversion of nitrogen oxides to less harmful reaction products.
  • filters are known which filter out particles of a certain size from the exhaust gas.
  • a disadvantage of the known in the prior art devices for cleaning exhaust gases of an internal combustion engine is that the arrangement of the individual catalysts in the exhaust system is not optimal and thus the individual catalysts do not achieve their individual optimum effect.
  • the so-called SCR catalysts for the selective catalytic reduction of nitrogen oxides are often arranged downstream of the particle filter. This has As a result, the SCR catalyst can not operate at its optimum operating point.
  • the object relating to the exhaust system is achieved by a ⁇ From gas system having the features of claim. 1
  • An embodiment of the invention relates to an exhaust system for the aftertreatment of exhaust gases of an internal combustion engine with viewed in the flow direction of the exhaust gas arranged sequentially, a catalyst for the oxidation of the exhaust gas and / or a catalyst for storing nitrogen oxides, with an introduction point for supplying a reducing agent, with an SCR Catalyst for the selective catalytic reduction of nitrogen oxides and with a particulate filter, wherein the particulate filter in the flow direction after the SCR catalyst is arranged and arranged in the flow direction downstream of the particulate filter, a second SCR catalyst and / or an ammonia slip catalyst.
  • SCR catalyst in a particulate filter for example, by a partial coating of the particulate filter is not optimal, since the commonly used cell densities and cell geometries of the honeycomb body of the particulate filter is not optimal for the selective catalytic reduction of the exhaust gas in the
  • SCR catalysts are.
  • a first aftertreatment of the exhaust gas can be carried out, in particular a conversion of the nitrogen oxides to water and nitrogen can take place with the aid of the already introduced and vaporized reducing agent, which is typically formed by an aqueous urea solution.
  • the subsequent particle filter a purification of the exhaust gas flow is achieved.
  • An SCR catalytic converter downstream of the particulate filter can then convert nitrogen oxides still contained in the exhaust gas.
  • the second SCR catalyst can particularly advantageously have a cell geometry and / or cell density deviating from the first SCR catalyst and also have a different chemically active coating.
  • a conversion of the nitrogen oxides can be achieved even at lower temperatures and flow rates.
  • the first SCR catalytic converter arranged in the flow direction upstream of the particle filter is electrically heatable.
  • the electrical heating of the SCR catalyst is advantageous in order as quickly as possible, the exhaust gas to the required To heat operating temperature in order to perform the selective catalytic reduction can.
  • the first SCR catalytic converter in the flow direction has an extension of not more than 80 mm along the flow direction, wherein it preferably has an extension of less than 50 mm, with particular preference having an extension of less than 40 mm.
  • a particulate filter or to the second SCR catalyst relatively short ER- stretching of the first SCR catalyst is advantageous in order to influence the flow for the subsequent particulate filter only slightly and thus maintain a good filtering result in the Parti ⁇ particulate filters.
  • a preferred embodiment is characterized in that the first SCR catalyst in the flow direction is arranged at a distance along the flow direction of not more than 20 mm, preferably less than 10 mm and more preferably less than 5 mm to the particle filter.
  • the smallest possible distance is advantageous in order to be able to summarize the pressure loss arising from the first SCR catalytic converter and the particle filter. This facilitates the design of the exhaust system. It is also preferable if the first SCR catalyst in the flow direction and the second in the flow direction
  • SCR catalyst are formed with the particulate filter as a modular unit. This is advantageous to facilitate the assembly.
  • the SCR catalysts and the particle filter are formed by a common honeycomb body. This is advantageous to keep the number of installed elements as low as possible, whereby the assembly is simplified.
  • the honeycomb body of the particle filter one of the honeycomb body of the flow direction first SCR catalyst and the honeycomb body of the second SCR catalyst in Strö ⁇ tion deviating Zellgeo ⁇ metry and / or cell density. This is especially before ⁇ geous to adjust the individual components perfectly to their JE pier purpose and overall to achieve the lowest possible pressure drop over the individual components of time.
  • the filter characteristics and the VELOCITY ⁇ speed distribution can be influenced by the cell geometries, for example.
  • the cell geometry and / or the cell density and / or the chemically active coating of the honeycomb body and / or the coating amount of the honeycomb body of the first SCR catalyst in the direction of flow is determined by the cell geometry and / or the cell density and / or the cell density chemically active coating of the honeycomb body deviates in the flow direction second SCR catalyst.
  • the coating can also be advantageously adapted to the regularly lower concentration of ammonia and nitrogen oxides, in order nevertheless to produce as complete a conversion of the nitrogen oxides as possible.
  • the coating amount of the first SCR catalyst in the flow direction is higher than the coating amount of the second SCR catalyst in the flow direction.
  • Fig. 1 is a sectional view through an exemplary exhaust system with a plurality of catalysts.
  • the exhaust system 1 shows a sectional view through an exhaust system of an exhaust system 1.
  • the exhaust system 1 has a plurality of catalysts, which are arranged in housings and connected to each other by pipelines such that exhaust gas can flow through the catalysts.
  • a catalyst 3 for the oxidation of the exhaust gas is first arranged in the flow direction 2 of the exhaust gas.
  • a reducing agent such as an aqueous urea solution
  • an evaporation element 5 is arranged, on which the reducing agent can be evaporated, in order subsequently to react as ammonia with the nitrogen oxides in the exhaust gas.
  • a first SCR catalyst 6 Downstream follows then a first SCR catalyst 6, in which the nitrogen oxides in the exhaust gas react with the ammonia and the chemically active coating of the SCR catalyst 6 and thus form nitrogen and water.
  • the first SCR catalytic converter 6 is followed by a particle filter 7, which serves to filter the exhaust gas and in particular filters out soot particles from the exhaust gas.
  • a second SCR catalyst follows 8. In this chemical reaction takes place the same reaction as in the first SCR catalyst 6.
  • the advantage of such a structure is that already takes place a reduction of nitrogen oxides in the exhaust gas before Exhaust gas flows into the particle filter.
  • the exhaust gas flowing into the first SCR catalytic converter therefore still has a particularly high temperature and the exhaust gas distribution over the cross section of the flow path is not adversely affected by the particulate filter. This can be done a particularly we ⁇ kung full conversion of the nitrogen oxides in the exhaust gas.
  • the temperature of the exhaust gas drops significantly, as a result of which the chemical reaction in the downstream SCR catalyst usually does not proceed optimally.
  • the second SCR catalyst essentially serves to reduce the not yet reduced in the first SCR catalyst nitrogen oxide content.
  • an ammonia slip catalyst which can bind excess ammonia (NH 3 ) which was not reacted in the reduction of the nitrogen oxides in the exhaust gas. In this way, for example, a breakthrough of ammonia can be avoided in the exhaust, which ammonia could escape into the environment and could lead to an odor nuisance or pollution of the environment.
  • Figure 1 has in particular no limiting character and serves to illustrate the inventive concept.

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)
  • Materials Engineering (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

L'invention concerne un système d'échappement (1) servant à traiter ultérieurement des gaz d'échappement d'un moteur à combustion interne avec, disposés les uns après les autres vus dans la direction d'écoulement (2) des gaz d'échappement, un catalyseur (3) d'oxydation des gaz d'échappement et/ou un catalyseur de stockage d'oxydes d'azote pourvu d'un point d'introduction (4) servant à amener un agent de réduction, d'un catalyseur SCR (6) de réduction sélective catalytique d'oxydes d'azote et d'un filtre à particules (7). Le filtre à particules (7) est disposé, dans la direction d'écoulement (2), après le catalyseur SCR (6), et un deuxième catalyseur SCR (8) et/ou un catalyseur contre les dégagements d'ammoniac sont disposés dans la direction d'écoulement (2) après le filtre à particules (7).
EP18715624.5A 2017-04-13 2018-03-29 Système d'échappement Withdrawn EP3610141A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017206425.0A DE102017206425A1 (de) 2017-04-13 2017-04-13 Abgassystem
PCT/EP2018/058157 WO2018188968A1 (fr) 2017-04-13 2018-03-29 Système d'échappement

Publications (1)

Publication Number Publication Date
EP3610141A1 true EP3610141A1 (fr) 2020-02-19

Family

ID=61899250

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18715624.5A Withdrawn EP3610141A1 (fr) 2017-04-13 2018-03-29 Système d'échappement

Country Status (7)

Country Link
US (1) US20200040783A1 (fr)
EP (1) EP3610141A1 (fr)
JP (1) JP2020516815A (fr)
KR (1) KR20190122259A (fr)
CN (1) CN110537008A (fr)
DE (1) DE102017206425A1 (fr)
WO (1) WO2018188968A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019131829B3 (de) * 2019-11-25 2021-01-14 Volkswagen Aktiengesellschaft Verfahren zur Abgasnachbehandlung eines Verbrennungsmotors

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JP2020516815A (ja) 2020-06-11
US20200040783A1 (en) 2020-02-06
WO2018188968A1 (fr) 2018-10-18
DE102017206425A1 (de) 2018-10-18
CN110537008A (zh) 2019-12-03

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