WO2011147556A1 - Exhaust gas after-treatment device - Google Patents

Exhaust gas after-treatment device Download PDF

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Publication number
WO2011147556A1
WO2011147556A1 PCT/EP2011/002546 EP2011002546W WO2011147556A1 WO 2011147556 A1 WO2011147556 A1 WO 2011147556A1 EP 2011002546 W EP2011002546 W EP 2011002546W WO 2011147556 A1 WO2011147556 A1 WO 2011147556A1
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WO
WIPO (PCT)
Prior art keywords
reducing agent
exhaust gas
exhaust
aftertreatment device
agent addition
Prior art date
Application number
PCT/EP2011/002546
Other languages
German (de)
French (fr)
Inventor
Alexander Schneider
Original Assignee
Mtu Friedrichshafen Gmbh
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Publication date
Application filed by Mtu Friedrichshafen Gmbh filed Critical Mtu Friedrichshafen Gmbh
Publication of WO2011147556A1 publication Critical patent/WO2011147556A1/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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/08—Gas passages being formed between the walls of an outer shell and an inner chamber
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/18—Structure or shape of gas passages, pipes or tubes the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/02—Two or more expansion chambers in series connected by means of tubes
    • F01N2490/06—Two or more expansion chambers in series connected by means of tubes the gases flowing longitudinally from inlet to outlet in opposite directions
    • 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
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • 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 present invention relates to an exhaust aftertreatment device according to the preamble of claim 1.
  • Exhaust aftertreatment devices are used, for example, in the treatment of exhaust gases generated by a diesel engine.
  • An example of such an exhaust aftertreatment device is known from DE 10 2008 009 564 A1.
  • the exhaust aftertreatment device according to DE 10 2008 009 564 A1 has an introduction device, a hydrolysis catalyst, and an SCR catalyst (nitrogen oxide reduction catalyst).
  • the introduction device is formed in its interior as a Venturi nozzle for introducing urea into the exhaust gas stream flowing through it.
  • the urea to be introduced is in the form of urea pellets, which are conveyed via an air flow generated by an external compressor and decomposed into ammonia and isocyanic acid before being introduced into the exhaust gas stream in a thermolysis reactor.
  • the exhaust aftertreatment device according to DE 10 2008 009 564 A1 also requires a relatively large amount of energy, in particular since the thermolysis reactor has to be heated to about 250 ° to 400 °.
  • a handling of the urea pellets when refilling the inventory in-vehicle for the driver is cumbersome.
  • a further exhaust aftertreatment device which has an exhaust gas inlet, a reducing agent addition system for adding reducing agent into the exhaust gas flow, a nitrogen oxide reduction catalytic converter and an exhaust gas outlet.
  • the exhaust gas stream entering the exhaust aftertreatment device passes, after passing through a particle filter, into a collecting pipe in which a urea-water solution is injected under pressure-air support.
  • a supply line for the urea-water solution is attached to one end of the collecting tube in its middle. orders, from which the solution is injected into the exhaust stream.
  • a hydrolysis catalyst is arranged downstream of the feed line.
  • the exhaust gas aftertreatment device according to EP 1 556 587 B1 also has a relatively high energy requirement, since the hydrolysis catalytic converter is energy-intensive. Furthermore, deposits may occur in the inlet region of the urea-water solution, since polymers which are formed from the urea-water solution, if it is not heated quickly enough in their entirety, can accumulate.
  • the present invention has the object to provide an exhaust aftertreatment device, which acts energy-efficient and forms as little as possible deposits.
  • an exhaust gas aftertreatment device in particular for a diesel engine, which can flow through an exhaust gas stream in an exhaust gas flow direction and has an exhaust gas inlet, a reducing agent addition system for adding reducing agent into the exhaust gas stream, a nitrogen oxide reduction catalyst and an exhaust gas outlet, wherein the reducing agent addition system comprises at least two reducing agent addition devices, in particular injectors.
  • the exhaust aftertreatment device has an approximately annular chamber-type reducing agent addition region in which the addition of the reducing agent into the exhaust gas flow takes place.
  • the reductant delivery area is through an approximately tubular exhaust gas delivery device and a thereto formed concentrically arranged, approximately tubular reductant-receiving area-limiting device.
  • the reductant addition devices are disposed at an upstream end of the reductant addition region.
  • the exhaust gas inlet be formed adjacent to the upstream end of the reducing agent addition region in the exhaust gas supply device.
  • the annular chamber reductant access region of the exhaust aftertreatment device is housed in a housing, wherein the tubular exhaust gas supply device and the tubular restriction device extend between a first housing end wall and a second housing end wall in the housing, the exhaust inlet into the reductant access region in the exhaust gas supply device adjacent to the second end of the restriction device closing housing end wall is formed, and wherein the Reduktionsstoffzugabevoriquesen adjacent to the second housing end wall in the region of the exhaust gas inlet at the upstream end of the Reduktionsstoffzugabe Schemes are arranged.
  • the exhaust gas supply device and / or the reducing agent addition region limiting device have a circular or an elliptical cross-sectional shape.
  • the exhaust gas supply device and the reducing agent adding region limiting device have an identical cross-sectional shape.
  • the reducing agent adding devices have a common feed line. Furthermore, it is proposed that the reducing agent addition devices can be controlled individually, ie they can be opened and closed individually.
  • Figure 1 is an illustration of a possible embodiment of an exhaust aftertreatment device according to the invention in longitudinal section.
  • FIG. 2 shows a sectional view of the embodiment according to FIG. 1 along the line A-A.
  • an exhaust aftertreatment device 1 is arranged in an approximately cylindrical housing 2 which has a cylinder jacket 3, a first end wall 4 and a second end wall 5.
  • a first recess 6 is arranged, through which an exhaust gas supply device in the form of a feed tube 7 extends in the axial direction into the housing 2 inside.
  • the feed tube 7 has an approximately elliptical cross-section in the described embodiment, but in alternative embodiments, any other cross-sectional shape, for example a circular, square or rectangular cross-section is conceivable.
  • the exhaust aftertreatment device 1 is one of a (not shown) produced exhaust gas flow through the exhaust aftertreatment device 1 in an exhaust gas flow direction (indicated by arrows 8).
  • the restriction tube 13 has the same cross-sectional shape as the delivery tube 7 (elliptical). However, it is also conceivable that the limiting tube 13 can have a different cross-sectional shape, for example a circular, square or rectangular cross-sectional shape. The cross-sectional shape may correspond to that of the feed tube 7 or be different therefrom, so that the most varied cross sections for the reducing agent addition region 12 are conceivable.
  • the limiting tube 13 extends from the first end wall 4 of the housing 2 to the second end wall 5 of the housing 2 and is connected to both the first end wall 4 and the second end wall 5, preferably welded.
  • the reducing agent addition portion 12 on the second end face 5 of the housing 2, ie, at an upstream end of the reducing agent addition portion 12, there is disposed an annular member 14 to which are disposed four reducing agent addition means in the form of injectors 15 dedicated to a reducing agent addition system aqueous urea solution (HWL, urea-water solution) in the current flowing through the reducing agent addition portion 12 exhaust stream (the exhaust stream in the reducing agent addition area 12 is indicated by arrows 16) inject.
  • HWL aqueous urea solution
  • the injectors 15 are on arranged uniformly distributed over the annular element 14. Alternatively, it would be conceivable to arrange the injection nozzles not evenly distributed, ie provide areas with an increased number or density of injectors 15 so as to be able to achieve optimum injection or injection of Reduktonsstoffs under consideration of the (each plant-specific) flow dynamics of the exhaust stream ,
  • the injection nozzles 15 are fed by a common feed line 17 with the aqueous urea solution and operated by means of a common rail method. That is, the urea aqueous solution in the common rail is pressurized at any time when the internal combustion engine produces exhaust gas.
  • the injectors 15 are opened and closed as desired (i.e., as needed) via a controller (not shown), ensuring desirable metering of the aqueous urea solution added to the exhaust stream.
  • the common supply line 17 and the control of the injection nozzles 15 are components of the reducing agent addition system.
  • the reducing agent-adding region limiting device in the form of the limiting tube 13 has elliptical recesses 19, which are arranged over the entire circumference of the limiting tube 13.
  • the exhaust gas (indicated by arrows 20) passes from the restricting pipe 13 into an SCR (nitrogen oxide reduction catalyst) prechamber 21, which is arranged upstream of an SCR catalytic converter 22.
  • the SCR prechamber 21 is bounded at an upstream end 23 by the first end wall 4 and at a downstream end 24 adjacent to the SCR catalyst 22 by a partition wall 25 having four recesses 26 through which the exhaust stream mixed with the reductant (indicated by arrows 27) may enter the SCR catalyst 22.
  • an outlet chamber 28 Downstream of the SCR catalyst 22, an outlet chamber 28 is formed, which at an upstream end 29 of an SCR Catalyst outlet 30 and at a downstream end 31 is limited by the second end wall 5.
  • both the SCR prechamber 21 and the outlet chamber 28 are bounded by the housing 2, more precisely by the cylinder jacket 3 of the housing 2.
  • the cylinder jacket 3 has an exhaust gas outlet arranged in the region of the outlet chamber in the form of a recess 32, in which an outlet pipe 33 is arranged, through which the exhaust gas flow (indicated by arrows 34) leaves the exhaust gas aftertreatment device 1.
  • An exhaust gas flow generated by the internal combustion engine is supplied to the exhaust aftertreatment device 1 via the supply pipe 7.
  • the exhaust gas flow (indicated by arrows 11) passes from the feed tube 7 into the reducing agent addition zone 12, in which the aqueous urea solution is added as a reducing agent to the exhaust gas flow by means of the injection nozzles 15.
  • the exhaust gas stream passes into the SCR catalytic converter 22, in which a catalytic reaction of the nitrogen oxides contained in the exhaust gas stream takes place with the aqueous urea solution.
  • the after-treated exhaust gas flow leaves the exhaust aftertreatment device 1 via the outlet pipe 33 arranged in the exhaust gas outlet.
  • an exhaust gas aftertreatment device 1 can also have two, three or more than four injection nozzles 15
  • a better treatment of the exhaust gas flow HWL mixture occurs since the reducing agent does not ( as in the prior art) centrally in a certain spray angle, but in smaller amounts at different (injection) points by means of a plurality of injection nozzles 15 which are located corresponding to the respective (injection) points located or arranged, is introduced.
  • the reducing agent in the form of fine drops (the drop or Droplet size can be significantly reduced in contrast to the prior art) can be introduced. Accordingly, the reducing agent is better and faster evaporated.

Abstract

The invention relates to an exhaust gas after-treatment device (1), in particular for a diesel engine, through which an exhaust gas stream can flow in an exhaust gas flow direction and which comprises an exhaust gas inlet (10), a reducing agent addition system for adding reducing agent into the exhaust gas stream, a nitrogen oxide reduction catalyst (22) and an exhaust gas outlet (32), wherein the reducing agent addition system comprises at least two reducing agent addition devices, in particular injection nozzles (15).

Description

Abgasnachbehandlunqsvorrichtung  Abgasnachbehandlunqsvorrichtung
Die vorliegende Erfindung betrifft eine Abgasnachbehandlungsvorrichtung gemäß dem Oberbegriff von Anspruch 1. The present invention relates to an exhaust aftertreatment device according to the preamble of claim 1.
Abgasnachbehandlungsvorrichtungen finden beispielsweise bei der Behandlung von Abgasen, die von einem Dieselmotor erzeugt werden, Verwendung. Ein Beispiel für eine derartige Abgasnachbehandlungsvorrichtung ist aus der DE 10 2008 009 564 A1 bekannt. Die Abgasnachbehandlungsvorrichtung gemäß der DE 10 2008 009 564 A1 weist eine Einleitvorrichtung, einen Hydrolysekatalysator, sowie einen SCR-Katalysator (Stickoxid-Reduktionskatalysator) auf. Die Einleitvorrichtung ist in ihrem Inneren als Venturidüse zur Einleitung von Harnstoff in den durch sie strömenden Abgasstrom ausgebildet. Der einzuleitende Harnstoff liegt in Form von Harnstoffpellets vor, welche über einen von einem externen Kompressor erzeugten Luftstrom gefördert werden und vor der Einleitung in den Abgasstrom in einem Thermolysereaktor in Ammoniak und Isocyansäure zersetzt werden. Exhaust aftertreatment devices are used, for example, in the treatment of exhaust gases generated by a diesel engine. An example of such an exhaust aftertreatment device is known from DE 10 2008 009 564 A1. The exhaust aftertreatment device according to DE 10 2008 009 564 A1 has an introduction device, a hydrolysis catalyst, and an SCR catalyst (nitrogen oxide reduction catalyst). The introduction device is formed in its interior as a Venturi nozzle for introducing urea into the exhaust gas stream flowing through it. The urea to be introduced is in the form of urea pellets, which are conveyed via an air flow generated by an external compressor and decomposed into ammonia and isocyanic acid before being introduced into the exhaust gas stream in a thermolysis reactor.
Neben einem komplizierten Aufbau benötigt die Abgasnachbehandlungsvorrichtung gemäß der DE 10 2008 009 564 A1 auch eine relativ große Energiemenge, insbesondere da der Thermolysereaktor auf ca. 250° bis 400° aufgeheizt werden muss. Außerdem ist eine Handhabung der Harnstoffpellets beim Nachfüllen der im Fahrzeug befindlichen Vorräte für den Fahrer umständlich. In addition to a complicated structure, the exhaust aftertreatment device according to DE 10 2008 009 564 A1 also requires a relatively large amount of energy, in particular since the thermolysis reactor has to be heated to about 250 ° to 400 °. In addition, a handling of the urea pellets when refilling the inventory in-vehicle for the driver is cumbersome.
Aus der EP 1 556 587 B1 ist eine weitere Abgasnachbehandlungsvorrichtung bekannt, welche einen Abgaseinlass, ein Reduktionsmittelzugabesystem zur Zugabe von Reduktionsmittel in den Abgasstrom, einen Stickoxid- Reduktionskatalysator und einen Abgasauslass aufweist. Der in die Abgasnachbehandlungsvorrichtung eintretende Abgasstrom gelangt nach Durchlaufen eines Partikelfilters in ein Sammelrohr, in dem druckluftunterstützt eine Harnstoff-Wasser-Lösung eingeblasen wird. Hierzu ist an einem Ende des Sammelrohres in dessen Mitte eine Zuleitung für die Harnstoff-Wasser-Lösung ange- ordnet, aus der die Lösung in den Abgasstrom eingeblasen wird. Zur Verbesserung der Freisetzung von Ammoniak ist stromabwärts der Zuleitung ein Hydrolysekatalysator angeordnet. From EP 1 556 587 B1 a further exhaust aftertreatment device is known, which has an exhaust gas inlet, a reducing agent addition system for adding reducing agent into the exhaust gas flow, a nitrogen oxide reduction catalytic converter and an exhaust gas outlet. The exhaust gas stream entering the exhaust aftertreatment device passes, after passing through a particle filter, into a collecting pipe in which a urea-water solution is injected under pressure-air support. For this purpose, a supply line for the urea-water solution is attached to one end of the collecting tube in its middle. orders, from which the solution is injected into the exhaust stream. To improve the release of ammonia, a hydrolysis catalyst is arranged downstream of the feed line.
Auch die Abgasnachbehandlungsvorrichtung gemäß der EP 1 556 587 B1 weist einen relativ hohen Energiebedarf auf, da der Hydrolysekatalysator energieintensiv ist. Ferner kann es zu Ablagerungen im Einlassbereich der Harnstoff-Wasser-Lösung kommen, da sich Polymerisate, welche aus der Harnstoff- Wasser-Lösung gebildet werden, wenn diese nicht schnell genug in ihrer Gesamtheit erwärmt wird, anlagern können. The exhaust gas aftertreatment device according to EP 1 556 587 B1 also has a relatively high energy requirement, since the hydrolysis catalytic converter is energy-intensive. Furthermore, deposits may occur in the inlet region of the urea-water solution, since polymers which are formed from the urea-water solution, if it is not heated quickly enough in their entirety, can accumulate.
Ausgehend hiervon liegt der vorliegenden Erfindung die Aufgabe zugrunde, eine Abgasnachbehandlungsvorrichtung anzugeben, die energieeffizient wirkt und möglichst wenig Ablagerungen bildet. Proceeding from this, the present invention has the object to provide an exhaust aftertreatment device, which acts energy-efficient and forms as little as possible deposits.
Diese Aufgabe wird erfindungsgemäß durch eine Abgasnachbehandlungsvorrichtung mit den Merkmalen des Anspruchs 1 gelöst. This object is achieved by an exhaust aftertreatment device with the features of claim 1.
Vorgeschlagen wird erfindungsgemäß eine Abgasnachbehandlungsvorrichtung, insbesondere für einen Dieselmotor, welche von einem Abgasstrom in einer Abgasstromrichtung durchströmbar ist und einen Abgaseinlass, ein Reduktionsmittelzugabesystem zur Zugabe von Reduktionsmittel in den Abgasstrom, einen Stickoxid-Reduktionskatalysator und einen Abgasauslass aufweist, wobei das Reduktionsmittelzugabesystem wenigstens zwei Reduktionsmittelzugabevorrichtungen, insbesondere Einspritzdüsen, aufweist. According to the invention, an exhaust gas aftertreatment device is proposed, in particular for a diesel engine, which can flow through an exhaust gas stream in an exhaust gas flow direction and has an exhaust gas inlet, a reducing agent addition system for adding reducing agent into the exhaust gas stream, a nitrogen oxide reduction catalyst and an exhaust gas outlet, wherein the reducing agent addition system comprises at least two reducing agent addition devices, in particular injectors.
Gemäß einem Aspekt der Erfindung weist die Abgasnachbehandlungsvorrichtung einen in etwa ringkammerförmigen Reduktionsmittelzugabebereich auf, in dem die Zugabe des Reduktionsmittels in den Abgasstrom erfolgt. In accordance with one aspect of the invention, the exhaust aftertreatment device has an approximately annular chamber-type reducing agent addition region in which the addition of the reducing agent into the exhaust gas flow takes place.
Gemäß einem weiteren Aspekt der Erfindung ist der Reduktionsmittelzugabebereich durch eine in etwa röhrenförmige Abgaszuführvorrichtung und eine hierzu konzentrisch angeordnete, in etwa röhrenförmig ausgebildete Reduktionsmittelzugabebereich-Begrenzungsvorrichtung gebildet. In accordance with another aspect of the invention, the reductant delivery area is through an approximately tubular exhaust gas delivery device and a thereto formed concentrically arranged, approximately tubular reductant-receiving area-limiting device.
Gemäß einem weiteren Aspekt der Erfindung sind die Reduktionsmittelzugabevorrichtungen an einem stromaufwärtigen Ende des Reduktionsmittelzugabebereichs angeordnet. According to another aspect of the invention, the reductant addition devices are disposed at an upstream end of the reductant addition region.
Ebenfalls vorgeschlagen wird, dass der Abgaseinlass benachbart zum stromaufwärtigen Ende des Reduktionsmittelzugabebereichs in der Abgaszuführvorrichtung ausgebildet ist. It is also proposed that the exhaust gas inlet be formed adjacent to the upstream end of the reducing agent addition region in the exhaust gas supply device.
Vorzugsweise ist der ringkammerförmige Reduktionsmittelzugabebereich der Abgasnachbehandlungsvorrichtung in einem Gehäuse aufgenommen, wobei sich die röhrenförmige Abgaszuführvorrichtung und die röhrenförmige Begrenzungsvorrichtung zwischen einer ersten Gehäusestirnwand und einer zweiten Gehäusestirnwand im Gehäuse erstrecken, wobei der Abgaseinlass in den Reduktionsmittelzugabebereich in der Abgaszuführvorrichtung benachbart zur zweiten, das Ende der Begrenzungsvorrichtung verschließenden Gehäusestirnwand ausgebildet ist, und wobei die Reduktionsmittelzugabevorrichtungen benachbart zur zweiten Gehäusestirnwand im Bereich des Abgaseinlasses am stromaufwärtigen Ende des Reduktionsmittelzugabebereichs angeordnet sind. Preferably, the annular chamber reductant access region of the exhaust aftertreatment device is housed in a housing, wherein the tubular exhaust gas supply device and the tubular restriction device extend between a first housing end wall and a second housing end wall in the housing, the exhaust inlet into the reductant access region in the exhaust gas supply device adjacent to the second end of the restriction device closing housing end wall is formed, and wherein the Reduktionsmittelzugabevorrichtungen adjacent to the second housing end wall in the region of the exhaust gas inlet at the upstream end of the Reduktionsmittelzugabebereichs are arranged.
Weiterhin wird vorgeschlagen, dass die Abgaszuführvorrichtung und/oder die Reduktionsmittelzugabebereich-Begrenzungsvorrichtung eine kreisförmige oder eine elliptische Querschnittsform aufweisen. Furthermore, it is proposed that the exhaust gas supply device and / or the reducing agent addition region limiting device have a circular or an elliptical cross-sectional shape.
Ferner wird vorgeschlagen, dass die Abgaszuführvorrichtung und die Reduktionsmittelzugabebereich-Begrenzungsvorrichtung eine identische Querschnittsform aufweisen. Further, it is proposed that the exhaust gas supply device and the reducing agent adding region limiting device have an identical cross-sectional shape.
Gemäß einem weiteren Aspekt der Erfindung weisen die Reduktionsmittelzugabevorrichtungen eine gemeinsame Zuleitung auf. Weiterhin wird vorgeschlagen, dass die Reduktionsmittelzugabevorrichtungen einzeln ansteuerbar, d.h. einzeln offen- und schließbar sind. According to another aspect of the invention, the reducing agent adding devices have a common feed line. Furthermore, it is proposed that the reducing agent addition devices can be controlled individually, ie they can be opened and closed individually.
Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung einer Ausführungsform der Erfindung, anhand der Figuren der Zeichnungen, die erfindungswesentliche Einzelheiten zeigen, und aus den Ansprüchen. Die einzelnen Merkmale können je einzeln für sich oder zu mehreren in beliebiger Kombination bei einer Variante der Erfindung verwirklicht sein. Further features and advantages of the invention will become apparent from the following description of an embodiment of the invention, with reference to the figures of the drawings showing essential to the invention, and from the claims. The individual features can be realized individually for themselves or for several in any combination in a variant of the invention.
Eine bevorzugte Ausführungsform der Erfindung wird nachfolgend anhand der beigefügten Zeichnungen näher erläutert. Es zeigen: A preferred embodiment of the invention will be explained in more detail with reference to the accompanying drawings. Show it:
Fig. 1 eine Darstellung einer möglichen Ausführungsform einer erfindungsgemäßen Abgasnachbehandlungsvorrichtung im Längsschnitt; und Figure 1 is an illustration of a possible embodiment of an exhaust aftertreatment device according to the invention in longitudinal section. and
Fig 2 eine Schnittansicht der Ausführungsform gemäß Fig. 1 entlang der Linie A-A. 2 shows a sectional view of the embodiment according to FIG. 1 along the line A-A.
Wie aus den Figuren (insbesondere Fig. 1) entnommen werden kann, ist die beschriebene Ausführungsform einer erfindungsgemäßen Abgasnachbehandlungsvorrichtung 1 in einem in etwa zylinderförmigen Gehäuse 2 angeordnet, das einen Zylindermantel 3, eine erste Stirnwand 4 und eine zweite Stirnwand 5 aufweist. As can be seen from the figures (in particular FIG. 1), the described embodiment of an exhaust aftertreatment device 1 according to the invention is arranged in an approximately cylindrical housing 2 which has a cylinder jacket 3, a first end wall 4 and a second end wall 5.
In der ersten Stirnwand 4 ist eine erste Aussparung 6 angeordnet, durch welche sich eine Abgaszuführvorrichtung in Form eines Zuführrohres 7 in axialer Richtung in das Gehäuse 2 hinein erstreckt. Das Zuführrohr 7 hat in der beschriebenen Ausführungsform einen in etwa ellipsenförmigen Querschnitt, es ist aber in alternativen Ausführungsformen jegliche andere Querschnittsform, beispielsweise ein kreis-, quadrat- oder rechteckförmiger Querschnitt denkbar. In the first end wall 4, a first recess 6 is arranged, through which an exhaust gas supply device in the form of a feed tube 7 extends in the axial direction into the housing 2 inside. The feed tube 7 has an approximately elliptical cross-section in the described embodiment, but in alternative embodiments, any other cross-sectional shape, for example a circular, square or rectangular cross-section is conceivable.
Durch das Zuführrohr 7, das sich bis zu der zweiten Stirnwand 5 durch das Gehäuse hindurch erstreckt, und mit dieser verbunden (vorzugsweise verschweißt) ist, wird der Abgasnachbehandlungsvorrichtung 1 ein von einer (nicht dargestellten) Verbrennungskraftmaschine erzeugter Abgasstrom, der die Abgasnachbehandlungsvorrichtung 1 in einer Abgasstromrichtung durchströmt, zugeführt (angedeutet durch Pfeile 8). Hierfür weist das Zuführrohr 7 an einem der zweiten Stirnwand 5 benachbarten stromabwärtigen Ende 9 ellipsenförmige Aussparungen 10 (Abgaseinlass der Abgasnachbehandlungsvorrichtung 1 ) auf, welche über den gesamten Umfang des Zuführrohres 7 angeordnet sind. Durch die Aussparungen 10 gelangt der Abgasstrom (angedeutet durch Pfeile 1 1 ) aus dem Zuführrohr 7 in einen in etwa ringkammerförmigen Reduktionsmittelzugabebereich 12, der einerseits durch das Zuführrohr 7 und andererseits durch eine Reduktionsmittelzugabebereich-Begrenzungsvorrichtung in Form eines Begrenzungsrohres 13, welches konzentrisch zu dem Zuführrohr 7 angeordnet ist, begrenzt ist. By the feed tube 7, which extends through the housing up to the second end wall 5 and is connected (preferably welded) to the second end wall 5, the exhaust aftertreatment device 1 is one of a (not shown) produced exhaust gas flow through the exhaust aftertreatment device 1 in an exhaust gas flow direction (indicated by arrows 8). For this purpose, the feed tube 7 at one of the second end wall 5 adjacent downstream end 9 elliptical recesses 10 (exhaust inlet of the exhaust aftertreatment device 1), which are arranged over the entire circumference of the feed tube 7. Through the recesses 10 of the exhaust gas stream (indicated by arrows 1 1) from the feed tube 7 enters an approximately annular chamber reducing agent addition portion 12, on the one hand by the feed tube 7 and on the other hand by a reducing agent addition range limiting device in the form of a limiting tube 13, which concentric with the feed tube 7 is arranged is limited.
Das Begrenzungsrohr 13 hat dieselbe Querschnittsform wie das Zuführrohr 7 (ellipsenförmig). Es ist aber auch denkbar, dass das Begrenzungsrohr 13 eine andere Querschnittsform, beispielsweise eine kreis-, quadrat- oder recht- eckförmige Querschnittsform haben kann. Die Querschnittsform kann dabei derjenigen des Zuführrohres 7 entsprechen oder von dieser verschieden sein, so dass die verschiedensten Querschnitte für den Reduktionsmittelzugabebereich 12 denkbar sind. The restriction tube 13 has the same cross-sectional shape as the delivery tube 7 (elliptical). However, it is also conceivable that the limiting tube 13 can have a different cross-sectional shape, for example a circular, square or rectangular cross-sectional shape. The cross-sectional shape may correspond to that of the feed tube 7 or be different therefrom, so that the most varied cross sections for the reducing agent addition region 12 are conceivable.
Das Begrenzungsrohr 13 erstreckt sich von der ersten Stirnwand 4 des Gehäuses 2 bis zu der zweiten Stirnwand 5 des Gehäuses 2 und ist sowohl mit der ersten Stirnwand 4 als auch mit der zweiten Stirnwand 5 verbunden, vorzugsweise verschweißt. Im Reduktionsmittelzugabebereich 12 ist an der zweiten Stirnseite 5 des Gehäuses 2, d.h. an einem stromaufwärtigen Ende des Reduktionsmittelzugabebereichs 12, ein ringförmiges Element 14 angeordnet, an welchem vier zu einem Reduktionsmittelzugabesystem gehörende Reduktionsmittelzugabevorrichtungen in Form von Einspritzdüsen 15 angeordnet sind, welche dazu vorgesehen sind, eine wässrige Harnstoff-Lösung (HWL, Harnstoff-Wasser-Lösung) in den durch den Reduktionsmittelzugabebereich 12 strömenden Abgasstrom (der Abgasstrom im Reduktionsmittelzugabebereich 12 ist durch Pfeile 16 angedeutet) einzuspritzen. Die Einspritzdüsen 15 sind an dem ringförmigen Element 14 gleichverteilt angeordnet. Alternativ hierzu wäre es denkbar, die Einspritzdüsen nicht gleichverteilt anzuordnen, d.h. Bereiche mit einer erhöhten Anzahl bzw. Dichte von Einspritzdüsen 15 vorzusehen, um somit unter der Brücksichtigung der (jeweils anlagenspezifischen) Strömungsdynamik des Abgasstromes eine optimale Eindüsung bzw. Einspritzung des Reduktonsmittels erreichen zu können. The limiting tube 13 extends from the first end wall 4 of the housing 2 to the second end wall 5 of the housing 2 and is connected to both the first end wall 4 and the second end wall 5, preferably welded. In the reducing agent addition portion 12, on the second end face 5 of the housing 2, ie, at an upstream end of the reducing agent addition portion 12, there is disposed an annular member 14 to which are disposed four reducing agent addition means in the form of injectors 15 dedicated to a reducing agent addition system aqueous urea solution (HWL, urea-water solution) in the current flowing through the reducing agent addition portion 12 exhaust stream (the exhaust stream in the reducing agent addition area 12 is indicated by arrows 16) inject. The injectors 15 are on arranged uniformly distributed over the annular element 14. Alternatively, it would be conceivable to arrange the injection nozzles not evenly distributed, ie provide areas with an increased number or density of injectors 15 so as to be able to achieve optimum injection or injection of Reduktonsmittels under consideration of the (each plant-specific) flow dynamics of the exhaust stream ,
Die Einspritzdüsen 15 werden durch eine gemeinsame Zuleitung 17 mit der wässrigen Harnstoff-Lösung gespeist und mittels eines Common-Rail- Verfahrens betrieben. D.h., die in der gemeinsamen Zuleitung befindliche wässrige Harnstoff-Lösung steht zu jedem Zeitpunkt, zu dem die Verbrennungskraftmaschine Abgas produziert unter Druck. Die Einspritzdüsen 15 werden über eine (nicht dargestellte) Steuerung beliebig (d.h. nach Bedarf) geöffnet und geschlossen, was eine wunschgemäße Dosierung der wässrigen Harnstoff-Lösung, die dem Abgasstrom zugegeben wird, sicherstellt. Auch die gemeinsame Zuleitung 17 und die Steuerung der Einspritzdüsen 15 sind Bestandteile des Reduktionsmittelzugabesystems. The injection nozzles 15 are fed by a common feed line 17 with the aqueous urea solution and operated by means of a common rail method. That is, the urea aqueous solution in the common rail is pressurized at any time when the internal combustion engine produces exhaust gas. The injectors 15 are opened and closed as desired (i.e., as needed) via a controller (not shown), ensuring desirable metering of the aqueous urea solution added to the exhaust stream. The common supply line 17 and the control of the injection nozzles 15 are components of the reducing agent addition system.
An einem der ersten Stirnwand 4 benachbarten, stromabwärtigen Ende 18 weist die Reduktionsmittelzugabebereich-Begrenzungsvorrichtung in Form des Begrenzungsrohres 13 ellipsenförmige Aussparungen 19 auf, welche über den gesamten Umfang des Begrenzungsrohres 13 angeordnet sind. Durch die Aussparungen 19 gelangt das Abgas (angedeutet durch Pfeile 20) aus dem Begrenzungsrohr 13 in eine SCR- (Stickoxid-Reduktionskatalysator-) Vorkammer 21 , welche stromaufwärts eines SCR-Katalysators 22 angeordnet ist. Die SCR- Vorkammer 21 ist an einem stromaufwärtigen Ende 23 von der ersten Stirnwand 4 und an einem stromabwärtigen, an den SCR-Katalysator 22 grenzenden Ende 24 von einer Trennwand 25 begrenzt, welche vier Aussparungen 26 aufweist, durch welche der mit dem Reduktionsmittel vermischte Abgasstrom (angedeutet durch Pfeile 27) in den SCR-Katalysator 22 eintreten kann. At a downstream end 18 adjacent to the first end wall 4, the reducing agent-adding region limiting device in the form of the limiting tube 13 has elliptical recesses 19, which are arranged over the entire circumference of the limiting tube 13. Through the recesses 19, the exhaust gas (indicated by arrows 20) passes from the restricting pipe 13 into an SCR (nitrogen oxide reduction catalyst) prechamber 21, which is arranged upstream of an SCR catalytic converter 22. The SCR prechamber 21 is bounded at an upstream end 23 by the first end wall 4 and at a downstream end 24 adjacent to the SCR catalyst 22 by a partition wall 25 having four recesses 26 through which the exhaust stream mixed with the reductant (indicated by arrows 27) may enter the SCR catalyst 22.
Stromabwärts des SCR-Katalysators 22 ist eine Auslasskammer 28 ausgebildet, welche an einem stromaufwärtigen Ende 29 von einem SCR- Katalysatoraustritt 30 und an einem stromabwärtigen Ende 31 durch die zweite Stirnwand 5 begrenzt ist. In radialer Richtung sind sowohl die SCR-Vorkammer 21 , als auch die Auslasskammer 28 durch das Gehäuse 2, genauer gesagt durch den Zylindermantel 3 des Gehäuses 2 begrenzt. Der Zylindermantel 3 weist einen im Bereich der Auslasskammer angeordneten Abgasauslass in Form einer Aussparung 32 auf, in der ein Auslassrohr 33 angeordnet ist, durch welches der Abgasstrom (angedeutet durch Pfeile 34) die Abgasnachbehandlungsvorrichtung 1 verlässt. Downstream of the SCR catalyst 22, an outlet chamber 28 is formed, which at an upstream end 29 of an SCR Catalyst outlet 30 and at a downstream end 31 is limited by the second end wall 5. In the radial direction, both the SCR prechamber 21 and the outlet chamber 28 are bounded by the housing 2, more precisely by the cylinder jacket 3 of the housing 2. The cylinder jacket 3 has an exhaust gas outlet arranged in the region of the outlet chamber in the form of a recess 32, in which an outlet pipe 33 is arranged, through which the exhaust gas flow (indicated by arrows 34) leaves the exhaust gas aftertreatment device 1.
In der Folge sei die Funktionsweise der Abgasnachbehandlungsvorrichtung 1 erläutert. Ein von der Verbrennungskraftmaschine erzeugter Abgasstrom wird der Abgasnachbehandlungsvorrichtung 1 über das Zuführrohr 7 zugeführt. Über die im Zuführrohr 7 angeordneten Aussparungen 10 gelangt der Abgasstrom (angedeutet durch Pfeile 11) aus dem Zuführrohr 7 in den Reduktionsmittelzugabebereich 12, in dem dem Abgasstrom mittels der Einspritzdüsen 15 die wässrige Harnstoff-Lösung als Reduktionsmittel beigemischt wird. Nach dem Durchströmen des Reduktionsmittelzugabebereichs 12 und der SCR- Vorkammer 21 gelangt der Abgasstrom in den SCR-Katalysator 22, in dem eine katalytische Reaktion der im Abgasstrom enthaltenen Stickoxide mit der wässrigen Harnstoff-Lösung erfolgt. Nach dem Verlassen des SCR- Katalysators 22 verlässt der nachbehandelte Abgasstrom die Abgasnachbehandlungsvorrichtung 1 über das in dem Abgasauslass angeordnete Auslassrohr 33. In the following, the operation of the exhaust aftertreatment device 1 will be explained. An exhaust gas flow generated by the internal combustion engine is supplied to the exhaust aftertreatment device 1 via the supply pipe 7. Via the recesses 10 arranged in the feed tube 7, the exhaust gas flow (indicated by arrows 11) passes from the feed tube 7 into the reducing agent addition zone 12, in which the aqueous urea solution is added as a reducing agent to the exhaust gas flow by means of the injection nozzles 15. After flowing through the reducing agent addition region 12 and the SCR prechamber 21, the exhaust gas stream passes into the SCR catalytic converter 22, in which a catalytic reaction of the nitrogen oxides contained in the exhaust gas stream takes place with the aqueous urea solution. After leaving the SCR catalytic converter 22, the after-treated exhaust gas flow leaves the exhaust aftertreatment device 1 via the outlet pipe 33 arranged in the exhaust gas outlet.
Durch die Mehrzahl von Einspritzdüsen 15 (es sei an dieser Stelle angemerkt, dass eine erfindungsgemäße Abgasnachbehandlungsvorrichtung 1 auch zwei, drei oder mehr als vier Einspritzdüsen 15 aufweisen kann) kommt es zu einer besseren Aufbereitung des Abgasstrom-HWL-Gemisches, da das Reduktionsmittel nicht (wie beim Stand der Technik) zentral in einem bestimmten Spraywinkel, sondern in kleineren Mengen an verschiedenen (Einsprüh-) Punkten mittels mehrerer Einspritzdüsen 15, welche korrespondierend zu den jeweiligen (Einsprüh-)Punkten lokalisiert bzw. angeordnet sind, eingebracht wird. Dadurch kann des Reduktionsmittel in Form feiner Tropfen (die Tropfen- bzw. Tröpfchengröße kann im Gegensatz zum Stand der Technik deutlich verringert werden) eingebracht werden. Dementsprechend wird das Reduktionsmittel besser und schneller verdampft. Dies führt dazu, dass einer Bildung von Ablagerungen im Bereich der Eindüsstellen entgegengewirkt wird, da im Vergleich zum Stand der Technik weniger Reduktionsmittel an abgaswärmeren Stellen eingesprüht bzw. eingedüst wird. Die eingesprühte Menge kann ferner an den Bedarf angepasst werden, da es möglich ist, jede Einspritzdüse 15 wunschgemäß zu steuern. Es ist sogar möglich, einzelne Einspritzdüsen 15 zu- oder abzuschalten, um somit für optimale Parameter zu sorgen. Due to the plurality of injection nozzles 15 (it should be noted at this point that an exhaust gas aftertreatment device 1 according to the invention can also have two, three or more than four injection nozzles 15), a better treatment of the exhaust gas flow HWL mixture occurs since the reducing agent does not ( as in the prior art) centrally in a certain spray angle, but in smaller amounts at different (injection) points by means of a plurality of injection nozzles 15 which are located corresponding to the respective (injection) points located or arranged, is introduced. As a result, the reducing agent in the form of fine drops (the drop or Droplet size can be significantly reduced in contrast to the prior art) can be introduced. Accordingly, the reducing agent is better and faster evaporated. This leads to the formation of deposits being counteracted in the region of the injection points, since, compared to the prior art, less reducing agent is sprayed or injected at more heat-exhaustive points. The sprayed amount can be further adapted to the needs, since it is possible to control each injector 15 as desired. It is even possible to switch individual injection nozzles 15 on or off, in order thus to provide optimum parameters.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
1 Abgasnachbehandlungsvorrichtung 1 exhaust aftertreatment device
2 Gehäuse  2 housings
3 Zylindermantel  3 cylinder jacket
4 erste Stirnwand  4 first end wall
5 zweite Stirnwand  5 second end wall
6 Aussparung  6 recess
7 Zuführrohr  7 feed tube
8 Pfeil  8 arrow
9 der zweiten Stirnwand 5 benachbartes Ende des Zuführrohres 7 9 of the second end wall 5 adjacent end of the feed pipe. 7
10 Aussparung 10 recess
11 Pfeil  11 arrow
12 Reduktionsmittelzugabebereich  12 reductant addition area
13 Begrenzungsrohr  13 boundary tube
14 ringförmiges Element  14 annular element
15 Einspritzdüse  15 injection nozzle
16 Pfeil  16 arrow
17 Zuleitung  17 supply line
18 der ersten Stirnwand 4 benachbartes Ende des Begrenzungsrohres 13  18 of the first end wall 4 adjacent end of the limiting tube thirteenth
19 Aussparung  19 recess
20 Pfeil  20 arrow
21 SCR-Vorkammer  21 SCR prechamber
22 SCR-Katalysator  22 SCR catalyst
23 stromaufwärtiges Ende der SCR-Vorkammer 21  23 upstream end of the SCR prechamber 21
24 stromabwärtiges Ende der SCR-Vorkammer 21  24 downstream end of the SCR prechamber 21
25 Trennwand  25 partition
26 Aussparung  26 recess
27 Pfeil  27 arrow
28 Auslasskammer  28 outlet chamber
29 stromaufwärtiges Ende der Auslasskammer 28  29 upstream end of the discharge chamber 28
30 SCR-Katalysatoraustritt stromabwärtiges Ende der Auslasskammer 28 Aussparung 30 SCR catalyst outlet downstream end of the outlet chamber 28 recess
Auslassrohr outlet pipe
Pfeil arrow
Schnittlinie intersection

Claims

Patentansprüche claims
1. Abgasnachbehandlungsvorrichtung (1), insbesondere für einen Dieselmotor, welche von einem Abgasstrom durchströmbar ist und einen Abgaseinlass (10), ein Reduktionsmittelzugabesystem zur Zugabe von Reduktionsmittel in den Abgasstrom, einen Stickoxid-Reduktionskatalysator (22) und einen Abgasauslass (32) aufweist, dadurch gekennzeichnet, dass das Reduktionsmittelzugabesystem wenigstens zwei Reduktionsmittelzugabevorrichtungen, insbesondere Einspritzdüsen (15), aufweist. 1. exhaust aftertreatment device (1), in particular for a diesel engine, which is traversed by an exhaust gas stream and an exhaust gas inlet (10), a reducing agent addition system for adding reducing agent in the exhaust stream, a nitrogen oxide reduction catalyst (22) and an exhaust gas outlet (32), characterized in that the reducing agent addition system comprises at least two reducing agent adding devices, in particular injection nozzles (15).
2. Abgasnachbehandlungsvorrichtung (1) nach Anspruch 1 , dadurch gekennzeichnet, dass die Abgasnachbehandlungsvorrichtung (1 ) einen in etwa ringkammer- förmigen Reduktionsmittelzugabebereich (12) aufweist, in dem die Zugabe des Reduktionsmittels in den Abgasstrom erfolgt. 2. exhaust aftertreatment device (1) according to claim 1, characterized in that the exhaust gas aftertreatment device (1) has an approximately annular chamber-shaped reducing agent addition area (12), in which the addition of the reducing agent in the exhaust gas stream.
3. Abgasnachbehandlungsvorrichtung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Reduktionsmittelzugabebereich (12) durch eine in etwa röhrenförmige Abgaszuführvorrichtung (7) und eine hierzu konzentrisch angeordnete, in etwa röhrenförmig ausgebildete Reduktionsmittelzugabe- bereich-Begrenzungsvorrichtung (13) gebildet ist. 3. exhaust aftertreatment device (1) according to any one of the preceding claims, characterized in that the reducing agent addition area (12) by an approximately tubular Abgaszuführvorrichtung (7) and a concentrically arranged for this purpose, approximately tubular formed Reduktionsmittelzugabe- area-limiting device (13) is formed ,
4. Abgasnachbehandlungsvorrichtung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Reduktionsmittelzugabevorrichtungen (15) an einem stromaufwärtigen Ende des Reduktionsmittelzugabebereichs (12) angeordnet sind. An exhaust aftertreatment device (1) according to any one of the preceding claims, characterized in that the reducing agent adding means (15) are disposed at an upstream end of the reducing agent addition section (12).
5. Abgasnachbehandlungsvorrichtung (1) nach Anspruch 4, dadurch gekennzeichnet, dass der Abgaseinlass (10) benachbart zum stromaufwärtigen Ende des Reduktionsmittelzugabebereichs (12) in der Abgaszuführvorrichtung (7) ausgebildet ist. An exhaust aftertreatment device (1) according to claim 4, characterized in that the exhaust gas inlet (10) is formed adjacent to the upstream end of the reducing agent addition section (12) in the exhaust gas supply device (7).
6. Abgasnachbehandlungsvorrichtung (1) nach Anspruch 3, 4 oder 5, dadurch gekennzeichnet, dass der ringkammerförmige Reduktionsmittelzugabebereich (12) der Abgasnachbehandlungsvorrichtung (1) in einem Gehäuse (2) aufgenommen ist, dass sich die röhrenförmige Abgaszuführvorrichtung (7) und die röhrenförmige Begrenzungsvorrichtung (13) zwischen einer ersten Gehäusestirnwand (4) und einer zweiten Gehäusestirnwand (5) im Gehäuse (2) erstrecken, dass der Abgaseinlass (10) in den Reduktionsmittelzugabebereich (12) in der Abgaszuführvorrichtung (7) benachbart zur zweiten, das Ende der Begrenzungsvorrichtung (13) verschließenden Gehäusestirnwand (5) ausgebildet ist, wobei die Reduktionsmittelzugabevorrichtungen benachbart zur zweiten Gehäusestirnwand (5) im Bereich des Abgaseinlasses (10) am stromaufwärtigen Ende des Reduktionsmittelzugabebereichs (12) angeordnet sind. An exhaust aftertreatment device (1) according to claim 3, 4 or 5, characterized in that the annular chamber-shaped reducing agent addition portion (12) of the exhaust aftertreatment device (1) is housed in a housing (2) such that the tubular exhaust gas supply device (7) and the tubular restriction device (13) between a first housing end wall (4) and a second housing end wall (5) in the housing (2), that the exhaust gas inlet (10) into the reducing agent addition area (12) in the Abgaszuführvorrichtung (7) adjacent to the second, the end of the limiting device (13) closing housing end wall (5) is formed, wherein the Reduktionsmittelzugabevorrichtungen adjacent to the second housing end wall (5) in the region of the exhaust gas inlet (10) at the upstream end of the Reduktionsmittelzugabebereichs (12) are arranged.
7. Abgasnachbehandlungsvorrichtung (1) nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, dass die Abgaszuführvorrichtung (7) und/oder die Reduktionsmittelzugabebereich-Begrenzungsvorrichtung (13) eine kreisförmige oder eine elliptische Querschnittsform aufweisen. 7. exhaust aftertreatment device (1) according to one of claims 3 to 6, characterized in that the Abgaszuführvorrichtung (7) and / or the Reduktionsmittelzugabebereich limiting device (13) have a circular or an elliptical cross-sectional shape.
8. Abgasnachbehandlungsvorrichtung (1) nach einem der Ansprüche 3 bis 7, dadurch gekennzeichnet, dass die Abgaszuführvorrichtung (7) und die Reduktionsmittelzugabebereich-Begrenzungsvorrichtung (13) eine identische Querschnittsform aufweisen. 8. Exhaust after-treatment device (1) according to one of claims 3 to 7, characterized in that the Abgaszuführvorrichtung (7) and the Reduktionsmittelzugabebereich limiting device (13) have an identical cross-sectional shape.
9. Abgasnachbehandlungsvorrichtung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Reduktionsmittelzugabevorrichtungen (15) eine gemeinsame Zuleitung aufweisen. 9. exhaust aftertreatment device (1) according to any one of the preceding claims, characterized in that the Reduktionsmittelzugabevorrichtungen (15) have a common feed line.
10. Abgasnachbehandlungsvorrichtung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Reduktionsmittelzugabevorrichtungen (15) einzeln ansteuerbar, d.h. einzeln offen- und schließbar sind. 10. Aftertreatment device (1) according to any one of the preceding claims, characterized in that the reducing agent adding devices (15) are individually controllable, i. individually openable and closable.
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