WO2024120933A1 - Exhaust-gas aftertreatment system - Google Patents

Exhaust-gas aftertreatment system Download PDF

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Publication number
WO2024120933A1
WO2024120933A1 PCT/EP2023/083567 EP2023083567W WO2024120933A1 WO 2024120933 A1 WO2024120933 A1 WO 2024120933A1 EP 2023083567 W EP2023083567 W EP 2023083567W WO 2024120933 A1 WO2024120933 A1 WO 2024120933A1
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WO
WIPO (PCT)
Prior art keywords
aftertreatment system
exhaust
catalyst
exhaust gas
designed
Prior art date
Application number
PCT/EP2023/083567
Other languages
German (de)
French (fr)
Inventor
Mirco Conitz
Melanie Lücke
Carlo Schuhmann
Original Assignee
Daimler Truck AG
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Publication date
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Publication of WO2024120933A1 publication Critical patent/WO2024120933A1/en

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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
    • F01N3/02—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
    • F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—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 using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F01N3/0253—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 using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
    • 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
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1616—NH3-slip from catalyst

Definitions

  • the invention relates to an exhaust gas aftertreatment system which is designed to treat an exhaust gas flow resulting from the combustion of an internal combustion engine.
  • the exhaust gases emitted by internal combustion engines consist of a heterogeneous mixture containing, for example, gaseous emissions of carbon monoxide (CO), unburned hydrocarbons (HC) and nitrogen oxides (NOx) as well as materials in the condensed phase that can form particulate matter.
  • CO carbon monoxide
  • HC unburned hydrocarbons
  • NOx nitrogen oxides
  • catalyst systems are therefore provided to convert some or all of these exhaust gas components into non-limited exhaust gas components and to filter them.
  • DOC oxidation catalyst
  • DPF particulate filter
  • SRC selective reduction catalyst
  • DE 102012 209 197 B4 shows an exhaust aftertreatment system which has an electrically heated catalyst device, an oxidation catalyst device, a hydrocarbon absorber and a control module.
  • EP 3 111 067 B1 describes an exhaust gas aftertreatment system comprising a first oxidation catalyst for oxidizing compounds such as nitrogen, carbon and hydrogen, and comprising a first metering device which is arranged downstream of the first oxidation catalyst and is designed to release a first additive into the exhaust gas flow. Furthermore, a reduction catalyst device is included, which is arranged downstream of the first metering device and reduces nitrogen oxides in the exhaust gas flow by means of the first additive. The same arrangement is arranged again downstream of the first reduction catalyst device, wherein a second additive is used instead of the first additive.
  • the exhaust gas aftertreatment device comprises a particle filter, a NOx adsorber and an SCR catalyst downstream of the NOx adsorber in the direction of exhaust gas flow.
  • the SCR catalyst reaches the light-off temperature at an earlier point in time than the NOx adsorber reaches the desorption temperature.
  • US 2008/0264 042 A1 discloses a method for reducing NOx in exhaust gases produced by an internal combustion engine.
  • the method includes activating a heat source when the exhaust gases are below a certain temperature. Furthermore, this method includes injecting a reducing agent into the segment of the exhaust path upstream of the SCR catalyst in order to react with NOx in the exhaust gases in the segment.
  • an exhaust aftertreatment system for an internal combustion engine which has an exhaust line, a first injection direction in fluid communication with the exhaust line, which is conflicted in such a way that selectively injects fuel containing unburned hydrocarbon (HC) into the exhaust line, and an oxidation catalyst arranged in the exhaust line downstream of the first injection device.
  • the system comprises a catalyst for hydrocarbon selective catalytic reduction (HC-SCR) applied to the oxidation catalyst, a heating device positioned on an upstream side of the oxidation catalyst and set to heat the oxidation catalyst and the HC-SCR catalyst.
  • HC-SCR hydrocarbon selective catalytic reduction
  • exhaust aftertreatment systems must comply with Euro VI legislation.
  • Euro VII and higher even lower exhaust emission limits are being discussed.
  • significant performance improvements are therefore required for known exhaust aftertreatment systems.
  • Future aftertreatment systems must therefore comply with the ensure compliance with the prescribed emission parameters, in particular concerning NOx, NO2, NH3 and PN values.
  • the object of the present invention is to provide an exhaust gas aftertreatment system which can meet the aforementioned requirements.
  • the core of the exhaust gas aftertreatment system according to the invention is formed by a first metering device which is designed to add a first additive to the exhaust gas stream, comprising a heating device arranged downstream which is designed to introduce thermal energy, and further downstream an oxidation catalyst which is designed to oxidize nitrogen, carbon and hydrogen compounds contained in the exhaust gases.
  • the exhaust gas aftertreatment system is used to treat an exhaust gas flow resulting from the combustion of an internal combustion engine and can, for example, meet future exhaust gas legislation, such as Euro VII in particular.
  • future exhaust gas legislation such as Euro VII in particular.
  • the exhaust gas aftertreatment system according to the invention can achieve a significant increase in performance compared to known systems. This can be achieved in particular by arranging the elements, i.e. the first metering device, the heating device and the oxidation catalyst, and was downstream in this order.
  • the heating device is an electric heater or an electrically heated oxidation catalyst. If the heating device is designed as an electric heater, the NO2/NOx ratio, the HC light-off, the SCR light-off and the urea preparation can be improved. Instead of an electric heater, an electrically heated oxidation catalyst can also be used. The oxidation catalyst already mentioned can be used here. This can also release thermal energy. The electrically heated oxidation catalyst can also be used to oxidize compounds made of nitrogen, carbon and hydrogen in the exhaust gas. The invention significantly improves cold start emission performance while at the same time requiring minimal installation space. The core is therefore the arrangement and positioning of heating, dosing and catalyst devices in order to obtain maximum overall system performance.
  • an exhaust aftertreatment system is therefore proposed that enables rapid heating of all components during a cold start.
  • NOx reduction can be achieved.
  • low PN values and low secondary emissions, such as NH3 and NO2 in particular, can be maintained at the same time.
  • the first additive can be, for example, a HC hydrocarbon.
  • Other substances or mixtures of substances are also conceivable.
  • the electrically heated oxidation catalyst can additionally or alternatively serve as a poison scavenger, whereby in particular chemical elements can be accumulated which can lead to a deactivation of the catalytic surface.
  • a second metering device is connected downstream of the oxidation catalyst, which is designed to supply a second additive to the exhaust gas flow.
  • the second additive can be a urea solution, for example.
  • Other solutions, substances or mixtures of substances are also conceivable.
  • a first selective reduction catalyst is arranged after the second metering device.
  • the first selective reduction catalyst can be used for reducing nitrogen oxides NOx in the exhaust gas flow, in particular using a urea solution as a second additive.
  • a first slip catalyst is arranged after the first selective reduction catalyst, which serves to oxidize additive residues and/or to support the first reduction catalyst.
  • the first slip catalyst can, for example, oxidize NH3 slip.
  • the oxidation of additive residues and/or the support of the first reduction catalyst can take place through additional reduction of nitrogen oxides NOx in the exhaust gas flow.
  • the second additive is supplied depending on a diesel particle filter temperature. This makes it possible to provide sufficient NO2, in particular for passive regeneration.
  • a particle filter is connected downstream of the first slip catalyst, which is designed to retain and/or oxidize soot particles.
  • an oxidation layer that can be applied to the particle filter can lead to an exothermic reaction leading to soot regeneration and/or desulfurization of the following catalysts.
  • a sufficient NO2/NOx ratio is provided for NO2-based soot regeneration and/or NOx reduction on any subsequent SCR catalysts.
  • a third metering device is connected downstream of the particle filter, which is designed to supply a third additive to the exhaust gas flow.
  • the third additive can be a urea solution.
  • Other solutions, substances or mixtures of substances are also conceivable.
  • a second selective reduction catalyst is arranged after the third metering device. This makes it possible to achieve a reduction of nitrogen oxides NOx in the exhaust gas flow, in particular by using the second and/or third additive.
  • a second slip catalyst is arranged after the second selective reduction catalyst, which serves to oxidize additive residues and/or to support the first reduction catalyst. This advantageously allows NH3 slip to oxidize.
  • Fig. 1 is a schematic representation of a possible embodiment of the exhaust aftertreatment system
  • Fig. 2 shows a further schematic representation of a possible embodiment of the exhaust gas aftertreatment system.
  • the exhaust gas aftertreatment system 1 is designed to treat an exhaust gas flow resulting from the combustion of an internal combustion engine 20.
  • a first metering device 2 is provided, which serves to release a first additive into the exhaust gas flow.
  • a heating device 3 is provided downstream in order to supply thermal energy to the system and in particular to improve the HC light-off, the SRC light-off and/or the urea preparation by means of a NO2/NOx ratio.
  • an oxidation catalyst 4 which serves to oxidize nitrogen, carbon and hydrogen compounds in the exhaust gas.
  • the oxidation catalyst 4 can additionally be used as a poison trap to collect chemical elements, which can lead to deactivation of the catalytic surface.
  • a second metering device 5 can be arranged further downstream, specifically after the first oxidation catalyst 4.
  • the second metering device 5 is used in particular to supply a second additive to the exhaust gas flow.
  • the second additive can be a urea solution, for example.
  • Other substances, solutions or compositions are also conceivable as a second additive.
  • a first selective reduction catalyst 6 can be arranged further downstream, after the second metering device 5.
  • the first selective reduction catalyst 6 serves to reduce nitrogen oxides NOx in the exhaust gas flow, using a second additive.
  • the second additive can also contain a urea solution or another solution.
  • a first slip catalyst 7 can be arranged further downstream, in particular to oxidize NH3 slip.
  • the slip catalyst 7 serves in particular to oxidize an additive residue and/or to support the first reduction catalyst 6 by additionally reducing nitrogen oxides in the exhaust gas flow.
  • a control of the addition of the second additive can be provided depending on a diesel particulate filter temperature (DPF temperature) in order to provide sufficient NO2 for passive regeneration.
  • a particle filter 8 can also be arranged downstream of the first slip catalyst 7. This is designed in particular to retain and/or oxidize soot particles.
  • an oxidizing coating can be applied to the particle filter 8 in order to generate an exothermic reaction for soot regeneration and desulfurization of the following catalysts.
  • this can also provide a sufficient NO2/NOx ratio for NO2-based soot regeneration and/or NOx reduction on the following SCR catalysts.
  • a third metering device 9 can be provided to release a third additive into the exhaust gas flow.
  • the third additive can also be a urea solution, or another solution or composition.
  • a second selective reduction catalyst 10 can be arranged downstream of the third metering device 9. This serves in particular to reduce nitrogen oxides in the exhaust gas flow using the second and/or the third additive.
  • a second slip catalyst 11 can be provided to oxidize NH3 slip.
  • the second slip catalyst 11 is provided in particular to oxidize additive residues and/or to assist the second reduction catalyst 10 by additionally reducing nitrogen oxides NOx in the exhaust gas flow.
  • FIG. 2 A further embodiment of the exhaust gas aftertreatment system 1 can be seen in Fig. 2.
  • the same elements are provided with the same reference numerals, so that this does not need to be discussed in detail.
  • an electrically heated oxidation catalyst is provided here as the heating device 3, instead of an electrical heater and an oxidation catalyst 4.
  • This electrically heated oxidation catalyst can also be used as a poison trap to collect chemical elements, which can lead to deactivation of the catalytic surface.

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  • 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

The invention relates to an exhaust-gas aftertreatment system (1) designed to treat an exhaust-gas stream that results from the combustion in an internal combustion engine. The invention is characterized in that a first dosing device (2) is included which is designed to add a first additive into the exhaust-gas stream, wherein a heating device (3) is included which is arranged downstream and is designed to introduce thermal energy, and an oxidation catalytic converter (4) is included which is situated further downstream and is designed to oxidize compounds of nitrogen, carbon and hydrogen that are contained in the exhaust gases. 

Description

Abgasnachbehandlungssystem Exhaust aftertreatment system
Die Erfindung betrifft ein Abgasnachbehandlungssystem, das zur Behandlung eines aus der Verbrennung eines Verbrennungsmotors resultierenden Abgasstroms ausgebildet ist. The invention relates to an exhaust gas aftertreatment system which is designed to treat an exhaust gas flow resulting from the combustion of an internal combustion engine.
Die von Verbrennungsmotoren ausgestoßenen Abgase bestehen aus einer heterogenen Mischung, die beispielsweise gasförmige Emissionen aus Kohlenmonoxid (CO), unverbrannten Kohlenwasserstoffen (HC) und Stickoxiden (NOx) sowie Materialien in kondensierter Phase, die Partikelmaterial bilden können, enthalten. In einem Motorauslasssystem, beispielsweise bei einem Dieselmotor, sind daher Katalysatorsysteme vorgesehen, um bestimmte oder auch alle diese Abgasbestandteile in nicht limitierte Abgasbestandteile umzuwandeln und zu filtern. The exhaust gases emitted by internal combustion engines consist of a heterogeneous mixture containing, for example, gaseous emissions of carbon monoxide (CO), unburned hydrocarbons (HC) and nitrogen oxides (NOx) as well as materials in the condensed phase that can form particulate matter. In an engine exhaust system, for example in a diesel engine, catalyst systems are therefore provided to convert some or all of these exhaust gas components into non-limited exhaust gas components and to filter them.
Bekannte Abgasnachbehandlungssysteme bestehen meist aus einem Oxidationskatalysator (DOC), einem Partikelfilter (DPF) und einem selektiven Reduktionskatalysator (SRC), angeordnet in dieser Reihenfolge. Ebenso können die Elemente beispielsweise genau andersrum angeordnet sein. Known exhaust aftertreatment systems usually consist of an oxidation catalyst (DOC), a particulate filter (DPF) and a selective reduction catalyst (SRC), arranged in this order. The elements can also be arranged the other way around, for example.
So zeigt die DE 102012 209 197 B4 ein Abgasnachbehandlungssystem, das eine elektrisch beheizte Katalysatorvorrichtung, eine Oxidationskatalysatorvorrichtung, einen Kohlenwasserstoffabsorber und ein Steuermodul aufweist. For example, DE 102012 209 197 B4 shows an exhaust aftertreatment system which has an electrically heated catalyst device, an oxidation catalyst device, a hydrocarbon absorber and a control module.
Die EP 3 111 067 B1 beschreibt ein Abgasnachbehandlungssystem, umfassend einen ersten Oxidationskatalysator zur Oxidation von Verbindungen wie Stickstoff, Kohlenstoff und Wasserstoff, sowie umfassend eine erste Dosiereinrichtung, die stromabwärts des erstem Oxidationskatalysators angeordnet ist und zur Abgabe eines ersten Additivs in den Abgasstrom eingerichtet ist. Weiterhin ist eine Reduktionskatalysatoreinrichtung umfasst, die stromabwärts der ersten Dosiereinrichtung angeordnet ist und Stickoxide im Abgasstrom mittels des ersten Additivs reduziert. Dieselbe Anordnung ist nochmals stromabwärts der ersten Reduktionskatalysatoreinrichtung angeordnet, wobei ein zweites Additiv anstatt des ersten Additivs verwendet wird. EP 3 111 067 B1 describes an exhaust gas aftertreatment system comprising a first oxidation catalyst for oxidizing compounds such as nitrogen, carbon and hydrogen, and comprising a first metering device which is arranged downstream of the first oxidation catalyst and is designed to release a first additive into the exhaust gas flow. Furthermore, a reduction catalyst device is included, which is arranged downstream of the first metering device and reduces nitrogen oxides in the exhaust gas flow by means of the first additive. The same arrangement is arranged again downstream of the first reduction catalyst device, wherein a second additive is used instead of the first additive.
Die DE 10 2008 026 191 A1 beschreibt ein Abgasnachbehandlungssystem sowie ein Verfahren zur Partikel- und Stickoxidminderung. Die Abgasnachbehandlungseinrichtung umfasst einen Partikelfilter sowie einen NOx-Adsorber und einen in Abgasströmungsrichtung dem NOx-Adsorber nachgeschalteten SCR-Katalysator. Hier wird durch Zufuhr vom erhitzten Abgas zum NOx-Adsorber der SCR-Katalysator die Anspringtemperatur zu einem früheren Zeitpunkt erreicht als der NOx-Adsorber die Desorptionstemperatur. DE 10 2008 026 191 A1 describes an exhaust gas aftertreatment system and a method for reducing particles and nitrogen oxides. The exhaust gas aftertreatment device comprises a particle filter, a NOx adsorber and an SCR catalyst downstream of the NOx adsorber in the direction of exhaust gas flow. Here, by supplying heated exhaust gas to the NOx adsorber, the SCR catalyst reaches the light-off temperature at an earlier point in time than the NOx adsorber reaches the desorption temperature.
Die US 2008 / 0264 042 A1 offenbart eine Methode zur Reduzierung von NOx in Abgasen, die von einem Verbrennungsmotor erzeugt werden. Das Verfahren umfasst die Aktivierung einer Wärmequelle, wenn die Abgase unter einer bestimmten Temperatur liegen. Des Weiteren umfasst diese Methode die Einspritzung eines Reduktionsmittels in das Segment des Abgaswegs vor dem SCR-Katalysator, um in dem Segment mit NOx in den Abgasen zu reagieren. US 2008/0264 042 A1 discloses a method for reducing NOx in exhaust gases produced by an internal combustion engine. The method includes activating a heat source when the exhaust gases are below a certain temperature. Furthermore, this method includes injecting a reducing agent into the segment of the exhaust path upstream of the SCR catalyst in order to react with NOx in the exhaust gases in the segment.
Aus DE 102014 105 043 A1 ist ein Abgasnachbehandlungssystem für einen Verbrennungsmotor bekannt, das eine Abgasleitung, eine erste Einspritzrichtung in Fluidkommunikation mit der Abgasleitung, die derart konfligiert ist, selektiv Kraftstoff, der nicht verbrannten Kohlenwasserstoff (KW) enthält, in die Abgasleitung einspritzt und einen Oxidationskatalysator aufweist, der in der Abgasleitung stromabwärts von der ersten Einspritzeinrichtung angeordnet ist. Das System umfasst einen Katalysator für kohlenwasserstoffselektive katalytische Reduktion (KW-SCR), der auf den Oxidationskatalysator aufgebracht ist, eine Heizvorrichtung, die an einer stromaufwärtigen Seite des Oxidationskatalysators positioniert und derart eingestellt ist, den Oxidationskatalysator und den KW-SCR- Katalysator zu heizen. From DE 102014 105 043 A1 an exhaust aftertreatment system for an internal combustion engine is known, which has an exhaust line, a first injection direction in fluid communication with the exhaust line, which is conflicted in such a way that selectively injects fuel containing unburned hydrocarbon (HC) into the exhaust line, and an oxidation catalyst arranged in the exhaust line downstream of the first injection device. The system comprises a catalyst for hydrocarbon selective catalytic reduction (HC-SCR) applied to the oxidation catalyst, a heating device positioned on an upstream side of the oxidation catalyst and set to heat the oxidation catalyst and the HC-SCR catalyst.
Das Abgasnachbehandlungssysteme müssen nach heutigen Standards die Euro-Vl- Gesetzgebung erfüllen. Für weitere noch kommende Standards, wie beispielsweise Euro- VII und höher, sind noch niedrigere Abgasgrenzwerte im Gespräch. Insbesondere bei einem Kaltstart sind daher bei bekannten Abgasnachbehandlungssystemen deutliche Leistungssteigerungen notwendig. Zukünftige Nachbehandlungssysteme müssen daher die vorgeschriebenen Emissionsparameter gewährleisten, die insbesondere NOx-, NO2-, NH3- und PN-Werte betreffen. According to current standards, exhaust aftertreatment systems must comply with Euro VI legislation. For further upcoming standards, such as Euro VII and higher, even lower exhaust emission limits are being discussed. Particularly during a cold start, significant performance improvements are therefore required for known exhaust aftertreatment systems. Future aftertreatment systems must therefore comply with the ensure compliance with the prescribed emission parameters, in particular concerning NOx, NO2, NH3 and PN values.
Die Aufgabe der vorliegenden Erfindung besteht nun darin, ein Abgasnachbehandlungssystem anzugeben, welches die vorgenannten Anforderungen erfüllen kann. The object of the present invention is to provide an exhaust gas aftertreatment system which can meet the aforementioned requirements.
Erfindungsgemäß wird diese Aufgabe durch ein Abgasnachbehandlungssystem mit den Merkmalen im Anspruch 1 , und hier insbesondere im kennzeichnenden Teil des Anspruchs 1 gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen ergeben sich aus den hiervon abhängigen Unteransprüchen. According to the invention, this object is achieved by an exhaust gas aftertreatment system with the features in claim 1, and here in particular in the characterizing part of claim 1. Advantageous embodiments and further developments emerge from the dependent subclaims.
Den Kern des erfindungsgemäßen Abgasnachbehandlungssystems bildet eine erste Dosiereinrichtung, die zur Zugabe eines ersten Additivs in den Abgasstrom eingerichtet ist, wobei eine stromabwärts angeordnete Heizeinrichtung umfasst ist, die zur Einbringung thermischer Energie eingerichtet ist, sowie weiter stromabwärts ein Oxidationskatalysator, der zur Oxidation von in den Abgasen enthaltenen Stickstoff-, Kohlenstoff- und Wasserstoffverbindungen eingerichtet ist. The core of the exhaust gas aftertreatment system according to the invention is formed by a first metering device which is designed to add a first additive to the exhaust gas stream, comprising a heating device arranged downstream which is designed to introduce thermal energy, and further downstream an oxidation catalyst which is designed to oxidize nitrogen, carbon and hydrogen compounds contained in the exhaust gases.
Das Abgasnachbehandlungssystem dient zur Behandlung eines aus der Verbrennung eines Verbrennungsmotors resultierenden Abgasstroms und kann beispielsweise kommende Abgasgesetzgebungen, wie insbesondere Euro-Vll, erfüllen. Insbesondere bei einem Kaltstart kann mit dem erfindungsmäßen Abgasnachbehandlungssystem eine deutliche Leistungssteigerung in Bezug zu bekannten Systemen erreicht werden. Dies kann insbesondere durch die Anordnung der Elemente, das heißt der ersten Dosiereinrichtung, der Heizeinrichtung und des Oxidationskatalysators, und war stromabwärts in dieser Reihenfolge, erzielt werden. The exhaust gas aftertreatment system is used to treat an exhaust gas flow resulting from the combustion of an internal combustion engine and can, for example, meet future exhaust gas legislation, such as Euro VII in particular. Particularly during a cold start, the exhaust gas aftertreatment system according to the invention can achieve a significant increase in performance compared to known systems. This can be achieved in particular by arranging the elements, i.e. the first metering device, the heating device and the oxidation catalyst, and was downstream in this order.
Dabei ist die Heizeinrichtung eine elektrische Heizung oder ein elektrisch beheizter Oxidationskatalysator. Ist die Heizeinrichtung als elektrische Heizung ausgebildet, kann beispielsweise das NO2/NOx- Verhältnis, das HC-Light-off, das SCR-Light-off und die Harnstoffaufbereitung verbessert werden. Anstelle einer elektrischen Heizung kann ebenso ein elektrisch beheizter Oxidationskatalysator eingesetzt werden. Hierbei kann der bereits erwähnte Oxidationskatalysator verwendet werden. Dieser kann ebenso thermische Energie abgeben. Weiterhin kann der elektrisch beheizte Oxidationskatalysator zur Oxidation von Verbindungen aus Stickstoff, Kohlenstoff und Wasserstoff im Abgas dienen. Die Erfindung verbessert die Kaltstart-Emissionsleistung signifikant, während gleichzeitig ein minimaler Bauraum benötigt wird. Der Kern ist daher die Anordnung und Positionierung von Heiz-, Dosier- und Katalysatorvorrichtungen, um die maximale Gesamtsystemleistung zu erhalten. Insgesamt wird daher ein Abgasnachbehandlungssystem vorgeschlagen, das eine schnelle Erwärmung aller Komponenten bei einem Kaltstart ermöglicht. Dabei kann insbesondere eine NOx-Reduktion erzielt werden. Vorteilhafterweise kann gleichzeitig eine Beibehaltung von niedrigen PN-Werten sowie niedrigen Sekundäremissionen, wie insbesondere NH3 und NO2 gewährleistet werden. The heating device is an electric heater or an electrically heated oxidation catalyst. If the heating device is designed as an electric heater, the NO2/NOx ratio, the HC light-off, the SCR light-off and the urea preparation can be improved. Instead of an electric heater, an electrically heated oxidation catalyst can also be used. The oxidation catalyst already mentioned can be used here. This can also release thermal energy. The electrically heated oxidation catalyst can also be used to oxidize compounds made of nitrogen, carbon and hydrogen in the exhaust gas. The invention significantly improves cold start emission performance while at the same time requiring minimal installation space. The core is therefore the arrangement and positioning of heating, dosing and catalyst devices in order to obtain maximum overall system performance. Overall, an exhaust aftertreatment system is therefore proposed that enables rapid heating of all components during a cold start. In particular, NOx reduction can be achieved. Advantageously, low PN values and low secondary emissions, such as NH3 and NO2 in particular, can be maintained at the same time.
Das erste Additiv kann beispielsweise ein HC- Kohlenwasserstoff sein. Andere Stoffe oder Stoffgemische sind ebenso denkbar. The first additive can be, for example, a HC hydrocarbon. Other substances or mixtures of substances are also conceivable.
In einer vorteilhaften Ausführungsform kann der elektrisch beheizte Oxidationskatalysator zusätzlich oder alternativ als Giftfänger dienen, wobei insbesondere chemische Elemente angesammelt werden können, die zu einer Deaktivierung der katalytischen Oberfläche führen können. In an advantageous embodiment, the electrically heated oxidation catalyst can additionally or alternatively serve as a poison scavenger, whereby in particular chemical elements can be accumulated which can lead to a deactivation of the catalytic surface.
Gemäß einer sehr vorteilhaften Weiterbildung der Idee kann es dabei vorgesehen sein, dass eine zweite Dosiereinrichtung dem Oxidationskatalysator nachgeschaltet ist, die dazu eingerichtet ist, dem Abgasstrom ein zweites Additiv zuzuführen. Bei dem zweiten Additiv kann es sich beispielsweise um eine Harnstofflösung handeln. Andere Lösungen, Stoffe oder Stoffgemische sind ebenso denkbar. According to a very advantageous development of the idea, it can be provided that a second metering device is connected downstream of the oxidation catalyst, which is designed to supply a second additive to the exhaust gas flow. The second additive can be a urea solution, for example. Other solutions, substances or mixtures of substances are also conceivable.
Dabei kann es gemäß einer vorteilhaften Ausgestaltung vorgesehen sein, dass ein erster selektiver Reduktionskatalysator nach der zweiten Dosiereinrichtung angeordnet ist. Der erste selektive Reduktionskatalysator kann für eine Reduktion von Stickoxiden NOx im Abgasstrom, insbesondere unter Verwendung einer Harnstofflösung als zweites Additiv, herangezogen werden. According to an advantageous embodiment, it can be provided that a first selective reduction catalyst is arranged after the second metering device. The first selective reduction catalyst can be used for reducing nitrogen oxides NOx in the exhaust gas flow, in particular using a urea solution as a second additive.
Gemäß einer sehr vorteilhaften Weiterbildung der Idee kann es dabei vorgesehen sein, dass ein erster Schlupfkatalysator nach dem ersten selektiven Reduktionskatalysator angeordnet ist, der zur Oxidation von Additivrückständen und/oder zur Unterstützung des ersten Reduktionskatalysators dient. Durch den ersten Schlupfkatalysator kann beispielsweise NH3-Schlupf oxidieren. Die Oxidation von Additivrückständen und/oder die Unterstützung des ersten Reduktionskatalysators kann durch zusätzliche Reduktion von Stickoxiden NOx im Abgasstrom erfolgen. Dabei kann es gemäß einer vorteilhaften Ausgestaltung vorgesehen sein, dass eine Zufuhr des zweiten Additivs in Abhängigkeit von einer Diesel-Partikelfilter-Temperatur erfolgt. Dadurch kann ausreichend NO2, insbesondere für eine passive Regeneration, bereitgestellt werden. According to a very advantageous development of the idea, it can be provided that a first slip catalyst is arranged after the first selective reduction catalyst, which serves to oxidize additive residues and/or to support the first reduction catalyst. The first slip catalyst can, for example, oxidize NH3 slip. The oxidation of additive residues and/or the support of the first reduction catalyst can take place through additional reduction of nitrogen oxides NOx in the exhaust gas flow. According to an advantageous embodiment, it can be provided that the second additive is supplied depending on a diesel particle filter temperature. This makes it possible to provide sufficient NO2, in particular for passive regeneration.
Gemäß einer sehr vorteilhaften Weiterbildung der Idee kann es dabei vorgesehen sein, dass dem erster Schlupfkatalysator ein Partikelfilter nachgeschaltet ist, der dazu eingerichtet ist, Rußpartikel zurückzuhalten und/oder zu oxidieren. Beispielsweise kann eine Oxidationsschicht, die auf den Partikelfilter aufgetragen werden kann, eine exotherme Reaktion zu einer Rußregeneration und/oder zu einer Entschwefelung der folgenden Katalysatoren führen. Vorteilhafterweise ist ein ausreichendes NO2/NOx-Verhältnis für eine NO2-basierte Rußregeneration und/oder NOx-Reduktion an eventuell folgenden SCR- Katalysatoren vorgesehen. According to a very advantageous development of the idea, it can be provided that a particle filter is connected downstream of the first slip catalyst, which is designed to retain and/or oxidize soot particles. For example, an oxidation layer that can be applied to the particle filter can lead to an exothermic reaction leading to soot regeneration and/or desulfurization of the following catalysts. Advantageously, a sufficient NO2/NOx ratio is provided for NO2-based soot regeneration and/or NOx reduction on any subsequent SCR catalysts.
Dabei kann es gemäß einer vorteilhaften Ausgestaltung vorgesehen sein, dass eine dritte Dosiereinrichtung dem Partikelfilter nachgeschaltet ist, die dazu eingerichtet ist, dem Abgasstrom ein drittes Additiv zuzuführen. Bei dem dritten Additiv kann es sich um eine Harnstofflösung handeln. Andere Lösungen, Stoffe oder Stoffgemische sind ebenso denkbar. According to an advantageous embodiment, it can be provided that a third metering device is connected downstream of the particle filter, which is designed to supply a third additive to the exhaust gas flow. The third additive can be a urea solution. Other solutions, substances or mixtures of substances are also conceivable.
Gemäß einer sehr vorteilhaften Weiterbildung der Idee kann es dabei vorgesehen sein, dass ein zweiter selektiver Reduktionskatalysator nach der dritten Dosiereinrichtung angeordnet ist. Dadurch kann eine Reduktion von Stickoxiden NOx im Abgasstrom, insbesondere unter Verwendung des zweiten und/oder dritten Additivs, erreicht werden. According to a very advantageous development of the idea, it can be provided that a second selective reduction catalyst is arranged after the third metering device. This makes it possible to achieve a reduction of nitrogen oxides NOx in the exhaust gas flow, in particular by using the second and/or third additive.
Dabei kann es gemäß einer vorteilhaften Ausgestaltung vorgesehen sein, dass ein zweiter Schlupfkatalysator nach dem zweiten selektiven Reduktionskatalysator angeordnet ist, der zur Oxidation von Additivrückständen und/oder zur Unterstützung des ersten Reduktionskatalysators dient. Dadurch kann vorteilhafterweise NH3-Schlupf oxidieren. According to an advantageous embodiment, it can be provided that a second slip catalyst is arranged after the second selective reduction catalyst, which serves to oxidize additive residues and/or to support the first reduction catalyst. This advantageously allows NH3 slip to oxidize.
Weitere vorteilhafte Ausgestaltungen des erfindungsgemäßen Abgasnachbehandlungssystems ergeben sich auch aus dem Ausführungsbeispiel, welches nachfolgend unter Bezugnahme auf die Figuren näher dargestellt ist. Further advantageous embodiments of the exhaust gas aftertreatment system according to the invention also emerge from the exemplary embodiment which is described in more detail below with reference to the figures.
Dabei zeigen: Showing:
Fig. 1 eine schematische Darstellung einer möglichen Ausführungsform des Abgasnachbehandlungssystem; Fig. 2 eine weitere schematische Darstellung einer möglichen Ausführungsform des Abgasnachbehandlungssystems. Fig. 1 is a schematic representation of a possible embodiment of the exhaust aftertreatment system; Fig. 2 shows a further schematic representation of a possible embodiment of the exhaust gas aftertreatment system.
In der Darstellung der Fig. 1 ist eine mögliche Ausführungsform des Abgasnachbehandlungssystems 1 in einer schematischen Darstellung gezeigt. Das Abgasnachbehandlungssystem 1 ist zur Behandlung eines aus der Verbrennung eines Verbrennungsmotors 20 resultierenden Abgasstroms ausgelegt. Dazu ist eine erste Dosiereinrichtung 2 vorgesehen, die zur Abgabe eines ersten Additivs in den Abgasstrom dient. Stromabwärts ist eine Heizeinrichtung 3 vorgesehen, um dem System thermische Energie zuzuführen und insbesondere durch ein NO2/NOx-Verhältnis, das HC-Light-Off, das SRC-Light-Off und/oder die Harnstoffzubereitung zu verbessern. In the illustration in Fig. 1, a possible embodiment of the exhaust gas aftertreatment system 1 is shown in a schematic representation. The exhaust gas aftertreatment system 1 is designed to treat an exhaust gas flow resulting from the combustion of an internal combustion engine 20. For this purpose, a first metering device 2 is provided, which serves to release a first additive into the exhaust gas flow. A heating device 3 is provided downstream in order to supply thermal energy to the system and in particular to improve the HC light-off, the SRC light-off and/or the urea preparation by means of a NO2/NOx ratio.
Weiter stromabwärts ist ein Oxidationskatalysator 4 vorgesehen, der zur Oxidation von Stickstoff-, Kohlenstoff- und Wasserstoffverbindungen im Abgas dient. Der Oxidationskatalysator 4 kann zusätzlich als Giftfalle verwendet werden, um chemische Elemente zu sammeln, was zu einer Deaktivierung der katalytischen Oberfläche führen kann. Further downstream, an oxidation catalyst 4 is provided, which serves to oxidize nitrogen, carbon and hydrogen compounds in the exhaust gas. The oxidation catalyst 4 can additionally be used as a poison trap to collect chemical elements, which can lead to deactivation of the catalytic surface.
Eine zweite Dosiereinrichtung 5 kann weiter stromabwärts angeordnet sein, und zwar nach dem ersten Oxidationskatalysator 4. Die zweite Dosiereinrichtung 5 wird insbesondere dazu verwendet, dem Abgasstrom ein zweites Additiv zuzuführen. Das zweite Additiv kann beispielsweise eine Harnstofflösung sein. Andere Stoffe, Lösungen oder Zusammensetzungen sind ebenso als zweites Additiv denkbar. A second metering device 5 can be arranged further downstream, specifically after the first oxidation catalyst 4. The second metering device 5 is used in particular to supply a second additive to the exhaust gas flow. The second additive can be a urea solution, for example. Other substances, solutions or compositions are also conceivable as a second additive.
Weiter stromabwärts kann ein erster selektiver Reduktionskatalysator 6 angeordnet sein, und zwar nach der zweiten Dosiereinrichtung 5. Der erste selektive Reduktionskatalysator 6 dient zur Reduktion von Stickoxiden NOx im Abgasstrom, und zwar unter Verwendung eines zweiten Additivs. Das zweite Additiv kann ebenso eine Harnstofflösung, oder eine andere Lösung enthalten. A first selective reduction catalyst 6 can be arranged further downstream, after the second metering device 5. The first selective reduction catalyst 6 serves to reduce nitrogen oxides NOx in the exhaust gas flow, using a second additive. The second additive can also contain a urea solution or another solution.
Ein erster Schlupfkatalysator 7 kann weiter stromabwärts angeordnet sein, insbesondere um NH3 Schlupf zu oxidieren. Der Schlupfkatalysator 7 dient insbesondere dazu, einen Additivrückstand zu oxidieren und/oder den ersten Reduktionskatalysator 6 durch eine zusätzliche Reduktion von Stickoxiden in dem Abgasstrom zu unterstützen. Weiterhin kann eine Regelung der Zugabe des zweiten Additivs in Abhängigkeit von einer Dieselpartikelfilter-Temperatur (DPF-Temperatur) vorgesehen sein, um genügend NO2 für eine passive Regeneration bereitzustellen. Gemäß der dargestellten Ausführung kann weiterhin ein Partikelfilter 8 stromabwärts des ersten Schlupfkatalysators 7 angeordnet sein. Dieser ist insbesondere dazu ausgelegt, Rußpartikel zurückzuhalten und/oder zu oxidieren. Weiterhin kann eine oxidierende Beschichtung auf dem Partikelfilter 8 angebracht sein, um eine exotherme Reaktion zur Rußregeneration und Entschwefelung der folgenden Katalysatoren zu erzeugen. Vorteilhafterweise kann dadurch ebenso ein ausreichendes NO2/NOx-Verhältnis für eine NO2 basierte Rußregeneration und/oder NOx-Reduktion an den folgenden SCR-Katalysatoren bereitgestellt werden. A first slip catalyst 7 can be arranged further downstream, in particular to oxidize NH3 slip. The slip catalyst 7 serves in particular to oxidize an additive residue and/or to support the first reduction catalyst 6 by additionally reducing nitrogen oxides in the exhaust gas flow. Furthermore, a control of the addition of the second additive can be provided depending on a diesel particulate filter temperature (DPF temperature) in order to provide sufficient NO2 for passive regeneration. According to the embodiment shown, a particle filter 8 can also be arranged downstream of the first slip catalyst 7. This is designed in particular to retain and/or oxidize soot particles. Furthermore, an oxidizing coating can be applied to the particle filter 8 in order to generate an exothermic reaction for soot regeneration and desulfurization of the following catalysts. Advantageously, this can also provide a sufficient NO2/NOx ratio for NO2-based soot regeneration and/or NOx reduction on the following SCR catalysts.
Weiter stromabwärts kann eine dritte Dosiereinrichtung 9 vorgesehen sein, um ein drittes Additiv in den Abgasstrom abzugeben. Bei dem dritten Additiv kann es sich ebenso um eine Harnstofflösung, oder auch um eine andere Lösung oder Zusammensetzung handeln. Further downstream, a third metering device 9 can be provided to release a third additive into the exhaust gas flow. The third additive can also be a urea solution, or another solution or composition.
Ein zweiter selektiver Reduktionskatalysator 10 kann stromabwärts der dritten Dosiereinrichtung 9 angeordnet sein. Dieser dient insbesondere zur Reduktion von Stickoxiden im Abgasstrom unter Verwendung des zweiten und/oder des dritten Additivs. A second selective reduction catalyst 10 can be arranged downstream of the third metering device 9. This serves in particular to reduce nitrogen oxides in the exhaust gas flow using the second and/or the third additive.
Weiter stromabwärts kann ein zweiter Schlupfkatalysator 11 vorgesehen sein, um NH3- Schlupf zu oxidieren. Der zweite Schlupfkatalysator 11 ist insbesondere vorgesehen, um Additivrückstände zu oxidieren und/oder den zweiten Reduktionskatalysator 10 durch eine zusätzliche Reduktion von Stickoxiden NOx in dem Abgasstrom zu unterstützen. Further downstream, a second slip catalyst 11 can be provided to oxidize NH3 slip. The second slip catalyst 11 is provided in particular to oxidize additive residues and/or to assist the second reduction catalyst 10 by additionally reducing nitrogen oxides NOx in the exhaust gas flow.
Eine weitere Ausführungsvariante des Abgasnachbehandlungssystems 1 ist in Fig. 2 zu erkennen. Dieselben Elemente sind dabei mit denselben Bezugszeichen versehen, sodass hierauf im Detail nicht weiter eingegangen werden muss. Im Unterschied zu Fig. 1 ist hier ein elektrisch beheizter Oxidationskatalysator als Heizeinrichtung 3 vorgesehen, und zwar anstelle einer elektrischen Heizung und eines Oxidationskatalysators 4. Auch dieser elektrisch beheizte Oxidationskatalysator kann als Giftfalle verwendet werden, um chemische Elemente zu sammeln, was zu einer Deaktivierung der katalytischen Oberfläche führen kann. A further embodiment of the exhaust gas aftertreatment system 1 can be seen in Fig. 2. The same elements are provided with the same reference numerals, so that this does not need to be discussed in detail. In contrast to Fig. 1, an electrically heated oxidation catalyst is provided here as the heating device 3, instead of an electrical heater and an oxidation catalyst 4. This electrically heated oxidation catalyst can also be used as a poison trap to collect chemical elements, which can lead to deactivation of the catalytic surface.
Selbstverständlich lassen sich die beschriebenen Ausführungsvarianten des Abgasnachbehandlungssystems 1 in den Figuren 1 und 2 auch im Sinne der Erfindung abwandeln, sodass verschiedene Möglichkeiten entstehen, die eine schnelle Erwärmung des Abgasnachbehandlungssystems 1 bei einem Kaltstart ermöglichen. Of course, the described embodiments of the exhaust gas aftertreatment system 1 in Figures 1 and 2 can also be modified in accordance with the invention, so that various possibilities arise that enable rapid heating of the exhaust gas aftertreatment system 1 during a cold start.

Claims

Patentansprüche Abgasnachbehandlungssystem (1), das zur Behandlung eines aus der Verbrennung eines Verbrennungsmotors resultierenden Abgasstroms ausgebildet ist, wobei eine erste Dosiereinrichtung Exhaust gas aftertreatment system (1) which is designed to treat an exhaust gas flow resulting from the combustion of an internal combustion engine, wherein a first metering device
(2) umfasst ist, die zur Zugabe eines ersten Additivs in den Abgasstrom eingerichtet ist, wobei eine stromabwärts angeordnete Heizeinrichtung (3) umfasst ist, die zur Einbringung thermischer Energie eingerichtet ist, sowie weiter stromabwärts ein Oxidationskatalysator (4), der zur Oxidation von in den Abgasen enthaltenen Stickstoff-, Kohlenstoff- und Wasserstoffverbindungen eingerichtet ist, dadurch gekennzeichnet, dass die Heizeinrichtung (2) which is designed to add a first additive to the exhaust gas flow, wherein a heating device (3) arranged downstream is included, which is designed to introduce thermal energy, and further downstream an oxidation catalyst (4) which is designed to oxidize nitrogen, carbon and hydrogen compounds contained in the exhaust gases, characterized in that the heating device
(3) eine elektrische Heizung, welche direkt stromaufwärts einem Oxidationskatalysator (4) vorgeschaltet ist, oder ein elektrisch beheizbarer Oxidationskatalysator ist. Abgasnachbehandlungssystem (1) nach Anspruch 1, dadurch gekennzeichnet, dass eine zweite Dosiereinrichtung (5) dem Oxidationskatalysator (3) an electric heater, which is connected directly upstream of an oxidation catalyst (4), or is an electrically heatable oxidation catalyst. Exhaust gas aftertreatment system (1) according to claim 1, characterized in that a second metering device (5) is connected to the oxidation catalyst
(4) nachgeschaltet ist, die dazu eingerichtet ist, dem Abgasstrom ein zweites Additiv zuzuführen. Abgasnachbehandlungssystem (1) nach Anspruch 2, dadurch gekennzeichnet, dass ein erster selektiver Reduktionskatalysator (6) nach der zweiten Dosiereinrichtung (4) which is designed to supply a second additive to the exhaust gas flow. Exhaust aftertreatment system (1) according to claim 2, characterized in that a first selective reduction catalyst (6) is arranged downstream of the second metering device
(5) angeordnet ist. Abgasnachbehandlungssystem (1) nach Anspruch 3, dadurch gekennzeichnet, dass ein erster Schlupfkatalysator (7) nach dem ersten selektiver Reduktionskatalysator(5) is arranged. Exhaust aftertreatment system (1) according to claim 3, characterized in that a first slip catalyst (7) after the first selective reduction catalyst
(6) angeordnet ist, der zur Oxidation von Additivrückständen und/oder zur Unterstützung des ersten Reduktionskatalysators (6) dient. Abgasnachbehandlungssystem (1) nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass eine Zufuhr des zweiten Additivs in Abhängigkeit von einer Diesel-Partikelfilter- Temperatur erfolgt. Abgasnachbehandlungssystem (1) nach einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, dass dem erster Schlupfkatalysator (7) ein Partikelfilter (8) nachgeschaltet ist, der dazu eingerichtet ist, Rußpartikel zurückzuhalten und/oder zu oxidieren. Abgasnachbehandlungssystem (1) nach Anspruch 6, dadurch gekennzeichnet, dass auf den Partikelfilter (8) eine Oxidationsschicht aufgetragen ist, die exotherme Reaktion zu einer Rußregeneration und/oder zu einer Entschwefelung der folgenden Katalysatoren führt. Abgasnachbehandlungssystem (1) nach einem der Ansprüche 6 oder 7, dadurch gekennzeichnet, dass eine dritte Dosiereinrichtung (9) dem Partikelfilter (8) nachgeschaltet ist, die dazu eingerichtet ist, dem Abgasstrom ein drittes Additiv zuzuführen. Abgasnachbehandlungssystem (1) nach Anspruch 8, dadurch gekennzeichnet, dass ein zweiter selektiver Reduktionskatalysator (10) nach der dritten Dosiereinrichtung (9) angeordnet ist. Abgasnachbehandlungssystem (1) nach Anspruch 9, dadurch gekennzeichnet, dass ein zweiter Schlupfkatalysator (11) nach dem zweiten selektiven Reduktionskatalysator (10) angeordnet ist, der zur Oxidation von Additivrückständen und/oder zur Unterstützung des ersten Reduktionskatalysators (6) dient. (6) is arranged, which serves to oxidize additive residues and/or to support the first reduction catalyst (6). Exhaust aftertreatment system (1) according to one of claims 2 to 4, characterized in that the second additive is supplied as a function of a diesel particle filter temperature. Exhaust aftertreatment system (1) according to one of claims 4 or 5, characterized in that the first slip catalyst (7) is followed by a particle filter (8) which is designed to retain and/or oxidize soot particles. Exhaust aftertreatment system (1) according to claim 6, characterized in that an oxidation layer is applied to the particle filter (8), the exothermic reaction leading to soot regeneration and/or to desulfurization of the following catalysts. Exhaust aftertreatment system (1) according to one of claims 6 or 7, characterized in that a third metering device (9) is arranged downstream of the particle filter (8), which is designed to supply a third additive to the exhaust gas flow. Exhaust aftertreatment system (1) according to claim 8, characterized in that a second selective reduction catalyst (10) is arranged downstream of the third metering device (9). Exhaust aftertreatment system (1) according to claim 9, characterized in that a second slip catalyst (11) is arranged downstream of the second selective Reduction catalyst (10) is arranged, which serves to oxidize additive residues and/or to support the first reduction catalyst (6).
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