DE10140295A1 - Diesel engine exhaust gas system has several catalytic modules incorporated within a single housing - Google Patents

Diesel engine exhaust gas system has several catalytic modules incorporated within a single housing

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Publication number
DE10140295A1
DE10140295A1 DE10140295A DE10140295A DE10140295A1 DE 10140295 A1 DE10140295 A1 DE 10140295A1 DE 10140295 A DE10140295 A DE 10140295A DE 10140295 A DE10140295 A DE 10140295A DE 10140295 A1 DE10140295 A1 DE 10140295A1
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Germany
Prior art keywords
scr
gas
cat element
exhaust gas
outlet
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Granted
Application number
DE10140295A
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German (de)
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DE10140295B4 (en
Inventor
Georg Huethwohl
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Eberspaecher Unna GmbH and Co KG
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Purem Abgassysteme GmbH and Co KG
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Priority to DE10140295A priority Critical patent/DE10140295B4/en
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Publication of DE10140295B4 publication Critical patent/DE10140295B4/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]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/011—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more purifying devices arranged in parallel
    • F01N13/017—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more purifying devices arranged in parallel the purifying devices are arranged in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

A diesel engine exhaust pre-catalytic filter oxidises particles and forms nitric oxide discharging to a selective catalytic reduction (SCR) catalyst with incoming ammonia. The pre-catalyst and SCR esp. share a common housing (1) with a gas inlet (14) on one side and a gas outlet (15) on the other. The housing is sub-divided into a number of gas-tight chambers (2, 3, 4) by panels (16, 17). The modules are arranged in parallel within chambers. Each chamber contains a catalytic module (5) with a pre-catalytic element (51), pre-catalyst (512), SCR catalyst element (52) and SCR catalyst (522). Ammonia is introduced (6) into the second chamber.

Description

Die Erfindung betrifft eine Abgasnachbehandlungsvorrichtung zur Verringerung von Partikel- und NO-Emissionen bei Dieselmotoren, insbesondere für Nutzfahrzeuge, bei der einem der Partikeloxidation und der Bildung von Stickoxid dienenden Vorkatalysator nach einer gesteuerten Ammoniakzuführung ein SCR-Katalysator nachgeschaltet ist. The invention relates to an exhaust gas aftertreatment device for Reduction of particle and NO emissions in diesel engines, especially for commercial vehicles, in one of particle oxidation and formation of nitrogen oxide pre-catalyst after a controlled Ammonia supply is an SCR catalyst downstream.

Ein Verfahren zur Reduktion von Stickoxiden (NOx) an einem SCR- Katalysator der im Abgasstrang eines Dieselmotors angeordnet ist mit Ammoniak (NH3), welches vorzugsweise vor dem Katalysator in den Abgasstrom eingebracht wird, ist beispielsweise aus der DE 197 20 209 C1 bekannt. Insbesondere wird hier über eine gesteuerte Zuführung von Ammoniak gesprochen. A method for reducing nitrogen oxides (NO x ) on an SCR catalytic converter which is arranged in the exhaust line of a diesel engine with ammonia (NH 3 ), which is preferably introduced into the exhaust gas stream upstream of the catalyst, is known, for example, from DE 197 20 209 C1 , In particular, a controlled supply of ammonia is discussed here.

Bekannt sind aber auch Verfahrensprinzipien zur Abgasnachbehandlung zum Zwecke der Verringerung von Partikel- und NOx-Emissionen bei Nutzfahrzeug-Dieselmotoren, bei denen ein Vorkatalysator vorgesehen ist, in dem reaktives Stickstoffoxid erzeugt wird, welches die spätere SCR- Reaktion beschleunigt. Hierbei kommt ein entsprechender Vorkatalysator zum Einsatz, dem verfahrensmäßig ein externer Harnstoffkonverter zur Erzeugung von Ammoniak nachgeschaltet ist, von dem das erzeugte Ammoniak in den Abgasstrom zum nachgeschalteten SCR-Katalysator erfolgt. (s. Berichte zur Energie- und Verfahrenstechnik BEV, Schriftenreihe Heft 2001.1, Herausgeber Prof. Dr.-Ing. A. Leipertz, Erlangen 2001, veröffentlicht Essen 13./14. März 2001). Eine solche bekannte Abgasnachbehandlungsvorrichtung besteht aus mehreren Aggregaten, die einen hohen Platzbedarf haben bzw. eine große Baulänge erfordern, die in entsprechenden Nutzfahrzeugen zu konstruktiven Problemen führt. However, process principles for exhaust gas aftertreatment for the purpose of reducing particle and NO x emissions in commercial vehicle diesel engines are also known, in which a pre-catalytic converter is provided in which reactive nitrogen oxide is generated, which accelerates the subsequent SCR reaction. Here, a corresponding pre-catalyst is used, which, in terms of the process, is followed by an external urea converter for generating ammonia, from which the ammonia generated is carried into the exhaust gas stream to the downstream SCR catalyst. (see reports on energy and process engineering BEV, series Heft 2001.1, publisher Prof. Dr.-Ing. A. Leipertz, Erlangen 2001, published Essen March 13/14, 2001). Such a known exhaust gas aftertreatment device consists of several units that require a large amount of space or require a large overall length, which leads to design problems in corresponding commercial vehicles.

Die Aufgabe der Erfindung besteht darin, eine Abgasnachbehandlungsvorrichtung der eingangs genannten Art in ihrer Baulänge zu optimieren und eine entsprechende Baueinheit zu schaffen. The object of the invention is a To optimize exhaust gas aftertreatment device of the type mentioned in its length and to create a corresponding structural unit.

Gelöst wird die Erfindungsaufgabe mit einer Abgasnachbehandlungsvorrichtung mit den Merkmalen des Anspruchs 1. Bei einer solchen erfindungsgemäßen Vorrichtung sind die beiden Katalysatoren, der Vorkatalysator und der SCR-Katalysator in vorzugsweise rohrförmigen Katalysatormodulen vereinigt, die in Mehrfachanordnung vorzugsweise parallel zueinander in einem gemeinsamen Gehäuse untergebracht sind. Durch Zwischenwände im Gehäuse sind Kammern gebildet, wobei im Bereich der Überführung des aus dem Vorkatalysator austretenden Abgases zum Eintritt in den SCR-Katalysator in der Art einer Mischkammer um die entsprechenden Abschnitte des Katalysatormoduls herum Ammoniak direkt gasförmig zugeführt wird. The invention task is solved with a Exhaust gas aftertreatment device with the features of claim 1 device according to the invention are the two catalysts, the Pre-catalyst and the SCR catalyst in preferably tubular Combined catalyst modules, preferably in parallel in multiple arrangement are housed together in a common housing. By Partitions are formed in the housing, whereby in the area the transfer of the exhaust gas emerging from the pre-catalyst to Entry into the SCR catalytic converter in the manner of a mixing chamber around the corresponding sections of the catalyst module around ammonia directly is supplied in gaseous form.

Eine bevorzugte Ausführungsart eines Katalysatormoduls wird mit Anspruch 2 vorgeschlagen. Eine solche erfindungsgemäße Anordnung von Vorkatelement und SCR-Katelement führt zu einer kurzen Baulänge und einer besonders guten Mischung des aus dem Vorkatelement austretenden Abgases mit dem in dieser Mischkammer zugeführten Ammoniaks und ermöglicht die günstige Einströmung in das SCR-Katelement. Vorzugsweise kann die Ammoniakzuführung entsprechend verteilt in der Mischkammer in der Form einer Ammoniakeindüsung erfolgen. A preferred embodiment of a catalyst module is described with Claim 2 proposed. Such an arrangement according to the invention of Pre-cat element and SCR cat element result in a short overall length and a particularly good mixture of that from the pre-cat element escaping exhaust gas with the ammonia supplied in this mixing chamber and enables the favorable inflow into the SCR cat element. Preferably, the ammonia feed can be distributed accordingly in the Mixing chamber in the form of an ammonia injection.

Eine radiale Eintrittsgasführung und Gasaustrittsführung wird erreicht durch radial perforierte Rohrabschnitte an den entsprechenden Stellen des Katmoduls. Radial inlet gas routing and gas outlet routing is achieved through radially perforated pipe sections at the appropriate points of the cat module.

Um die Impulsbeaufschlagung der Rückwand des Gehäuses im Bereich der Gasaustritte aus dem SCR-Katelement durch das Abgas zu verhindern, wird gemäß den Ansprüchen 5 und 6 vorgeschlagen, hinter diesen Katelementen mit Abstand Prallscheiben vorzusehen, die eine Umlenkung des Abgasstromes in der entsprechenden Kammer bewirken. Aus dieser Kammer strömt das Abgas durch den entsprechenden Gasaustritt in der Rückwand des Gehäuses heraus. To impulse the rear wall of the housing in the area the gas escapes from the SCR catalytic converter through the exhaust gas prevent is proposed according to claims 5 and 6, behind them Provide catalytic elements with baffle plates at a distance that deflect cause the exhaust gas flow in the corresponding chamber. From this The exhaust gas flows through the corresponding gas outlet in the chamber Back of the housing.

Anhand eines prinzipiell abgebildeten Ausführungsbeispieles wird die Erfindung näher erläutert. Es zeigen: Based on an embodiment shown in principle, the Invention explained in more detail. Show it:

Fig. 1 einen Längsschnitt durch eine erfindungsgemäße Abgasnachbehandlungsvorrichtung mit mehreren Katalysatormodulen und Fig. 1 shows a longitudinal section through an exhaust gas aftertreatment device according to the invention with a plurality of catalyst modules and

Fig. 2 eine prinzipielle perspektivische Darstellung der Anordnung der Katalysatormodule im nur teilweise dargestellten Gehäuse. Fig. 2 is a basic perspective view of the arrangement of the catalyst modules in the housing only partially shown.

Die abgebildete Abgasnachbehandlung zeigt ein mit der Ziffer 1 bezeichnetes Gehäuse mit einem Mantel 11, einer Vorderwand 12 und einer Rückwand 13. Im Bereich der Vorderwand 12 ist mit der Ziffer 14 und entsprechender Pfeilangabe der vom Motor her einströmende Abgaseintritt bezeichnet. Die nachbehandelten Abgase treten an der Rückwand 13 im Bereich des Abgasaustrittes 15 aus. Durch die im Gehäuse vorgesehenen Zwischenwände 16 und 17 sind die Kammern 2, 3 und 4 gebildet, die gegeneinander abgetrennt sind. The exhaust gas aftertreatment shown shows a housing designated by the number 1 with a jacket 11 , a front wall 12 and a rear wall 13 . In the area of the front wall 12 , the number 14 and the corresponding arrow indicate the exhaust gas inlet flowing in from the engine. The aftertreated exhaust gases emerge from the rear wall 13 in the region of the exhaust gas outlet 15 . The chambers 2 , 3 and 4 , which are separated from one another, are formed by the partition walls 16 and 17 provided in the housing.

Mehrere parallel zueinander angeordnete rohrförmige Katalysatormodule sind mit ihren entsprechenden Abschnitten durch die Zwischenwände 16 und 17 abgedichtet hindurchgeführt. Dieses Katalysatormodul 5 besteht aus einem ersten Abschnitt, dem Vorkatelement 51, in welchem eine Partikeloxidation und die Bildung von Stickoxid erfolgt und einem zweiten Abschnitt, dem SCR-Katelement 52, in dem nach der Zugabe von Ammoniak die SCR-Reaktion erfolgt. A plurality of tubular catalyst modules arranged parallel to one another are led with their corresponding sections through the intermediate walls 16 and 17 in a sealed manner. This catalyst module 5 consists of a first section, the pre-cat element 51 , in which particle oxidation and the formation of nitrogen oxide takes place, and a second section, the SCR cat element 52 , in which the SCR reaction takes place after the addition of ammonia.

Das rohrförmige Vorkatelement 51 weist eine axiale und radiale Eintrittsgasführung 511 auf in Form des entsprechend perforierten Eingangsrohrabschnittes. Diese Abschnitte ragen in die aus der Vorderwand 12 des Gehäuses 1 und der Zwischenwand 16 gebildete Kammer 2, in die über den Gaseintritt 14 das Abgas einströmt. Nach dem Einströmen des Abgases durch die Eintrittsgasführung 511 gelangt das Abgas in den eigentlichen Vorkatalysator 512, tritt daraus rückseitig aus und strömt radial durch den in der Kammer 3 angeordneten Abschnitt der Austrittsgasführung 513 heraus. In dieser Kammer 3, der eigentlichen Mischkammer, wird dem Abgas über die Ammoniakeindüsung 6, die nach außen über eine Zuleitung 61 angeschlossen ist, Ammoniak zugemischt in Gasform. Dieses Gemischt strömt dann über die Eintrittsgasführung 521 in das SCR- Katelement 52. Das jeweilige rohrförmige Vorkatelement 51 ist mit einem Schräganschnitt und entsprechender Schottwand 7 gegen das nachfolgende SCR-Katelement 52 in axialer Richtung abgeschottet. Einen entsprechenden Schräganschnitt weist daher auch das SCR-Katelement 52 in seinem Eintrittsgasführungsabschnitt 521 auf. Über diese Eintrittsgasführung 521 strömt das Gemisch aus vorbehandeltem Abgas und Ammoniak zum eigentlichen SCR-Katalysator 522, in dem die SCR-Reaktion erfolgt. The tubular pre-cat element 51 has an axial and radial inlet gas guide 511 in the form of the correspondingly perforated inlet pipe section. These sections protrude into the chamber 2 formed from the front wall 12 of the housing 1 and the intermediate wall 16 , into which the exhaust gas flows via the gas inlet 14 . After the exhaust gas has flowed in through the inlet gas duct 511 , the exhaust gas enters the actual pre-catalytic converter 512 , emerges from the rear thereof and flows out radially through the section of the outlet gas duct 513 arranged in the chamber 3 . In this chamber 3 , the actual mixing chamber, ammonia is admixed to the exhaust gas in gaseous form via the ammonia injection 6 , which is connected to the outside via a feed line 61 . This mixture then flows into the SCR cat element 52 via the inlet gas guide 521 . The respective tubular pre-cat element 51 is sealed off in the axial direction against the subsequent SCR cat element 52 with a bevel cut and corresponding bulkhead 7 . The SCR cat element 52 therefore also has a corresponding oblique cut in its inlet gas guide section 521 . The mixture of pretreated exhaust gas and ammonia flows via this inlet gas duct 521 to the actual SCR catalytic converter 522 , in which the SCR reaction takes place.

Die Austrittsgasführung 523 des SCR-Katelementes 52 befindet sich in der Kammer 4, die von der Zwischenwand 17 und der Rückwand 13 gebildet wird. Das entsprechend behandelte Abgas tritt sowohl axial als auch teilweise radial aus. Das axial ausströmende Abgas wird gegen die mit Abstand angeordneten Prallscheiben 524 geführt und umgelenkt. Diese Prallscheiben 54 sind mit in entsprechendem radialen Abstand zueinander angeordneten Stegen 525 am SCR-Katelement 52 gehalten. Aus der Kammer 4 strömt das behandelte Abgas über den Abgasaustritt 15 aus dem Gehäuse 1 heraus, in der Regel zu einer Schalldämpferanlage. Bezugszeichenliste 1 Gehäuse
11 Mantel
12 Vorderwand
13 Rückwand
14 Abgaseintritt
15 Abgasaustritt
16 Zwischenwand
17 Zwischenwand
2 Kammer
3 Kammer
4 Kammer
5 Katalysatormodul
51 Vorkatelement
511 Eintrittsgasführung
512 Vorkatalysator
513 Austrittsgasführung
52 SCR-Katelement
521 Eintrittsgasführung
522 SCR-Katalysator
523 Austrittsgasführung
524 Prallscheibe
525 Steg
6 Ammoniakeindüsung
61 Zuleitung
7 Schottwand
The outlet gas duct 523 of the SCR cat element 52 is located in the chamber 4 , which is formed by the intermediate wall 17 and the rear wall 13 . The correspondingly treated exhaust gas exits both axially and partially radially. The axially outflowing exhaust gas is guided and deflected against the baffle plates 524 arranged at a distance. These baffle plates 54 are held on the SCR cat element 52 with webs 525 arranged at a corresponding radial distance from one another. The treated exhaust gas flows out of the chamber 4 via the exhaust outlet 15 out of the housing 1 , usually to a silencer system. LIST OF REFERENCE NUMERALS 1 Housing
11 coat
12 front wall
13 rear wall
14 exhaust gas inlet
15 Exhaust gas outlet
16 partition
17 partition
2 chamber
3 chamber
4 chamber
5 catalyst module
51 pre-cat element
511 inlet gas duct
512 pre-catalytic converter
513 outlet gas duct
52 SCR cat element
521 inlet gas duct
522 SCR catalytic converter
523 outlet gas duct
524 baffle plate
525 footbridge
6 ammonia injection
61 supply line
7 bulkhead

Claims (6)

1. Abgasnachbehandlungsvorrichtung zur Verringerung von Partikel- und NO-Emissionen bei Dieselmotoren, bei der einem der Partikeloxidation und der Bildung von Stickoxid dienenden Vorkatalysator nach einer gesteuerten Ammoniakzuführung ein SCR- Katalysator nachgeschaltet ist, gekennzeichnet durch ein gemeinsames Gehäuse (1) mit einem Abgaseintritt (14) an einer Seite und einem Abgasaustritt (15) an der anderen Seite, in welchem Gehäuse (1) durch Zwischenwände (16, 17) gegeneinander abgedichtete Kammern (2, 3, 4) gebildet und durch diese Zwischenwände mehrere Katalysatormodule (5) hindurchgeführt sind, deren erster Abschnitt jeweils ein Vorkatelement (51) ist mit axialer und/oder radialer Eintrittsgasführung (511) und radialer Austrittsgasführung (513) und deren gegen das Vorkatelement (51) axial abgeschotteter zweiter Abschnitt ein SCR-Katelement (52) ist mit radialer Gaseintrittsführung (521) und axialer und/oder radialer Gasaustrittsführung (513), wobei die Eintrittsgasführung (511) des Vorkatelementes (51) in einer ersten Kammer (2) mit dem Abgaseintritt (14), die radiale Austrittsgasführung (513) des Vorkatelements (51) und die radiale Eintrittsgasführung (521) des SCR- Katelementes (52) in einer zweiten Kammer (3), in die gasförmiges Ammoniak zugeführt wird, und die Gasaustrittsführung (523) des SCR-Katelementes (52) in einer dritten Kammer (4) mit dem Abgasaustritt (15) angeordnet sind. 1. Exhaust gas aftertreatment device for reducing particle and NO emissions in diesel engines, in which an SCR catalytic converter is used after a controlled ammonia supply and a particle catalyst is used for particle oxidation and nitrogen oxide formation, characterized by a common housing ( 1 ) with an exhaust gas inlet ( 14 ) on one side and an exhaust gas outlet ( 15 ) on the other side, in which housing ( 1 ) is formed by chambers ( 2 , 3 , 4 ) sealed against one another by partition walls ( 16 , 17 ) and a plurality of catalyst modules ( 5 ) are passed through these partition walls are, the first section of which is a pre-cat element ( 51 ) with an axial and / or radial inlet gas duct ( 511 ) and a radial outlet gas duct ( 513 ) and whose second section axially partitioned off from the pre-cat element ( 51 ) is an SCR-cat element ( 52 ) with a Gas inlet guide ( 521 ) and axial and / or radial gas outlet guide ( 513 ), the inlet gas duct ( 511 ) of the pre-cat element ( 51 ) in a first chamber ( 2 ) with the exhaust gas inlet ( 14 ), the radial outlet gas duct ( 513 ) of the pre-cat element ( 51 ) and the radial inlet gas duct ( 521 ) of the SCR cat element ( 52 ) in a second chamber ( 3 ), into which gaseous ammonia is fed, and the gas outlet guide ( 523 ) of the SCR cat element ( 52 ) is arranged in a third chamber ( 4 ) with the exhaust gas outlet ( 15 ). 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß jeweils das Vorkatelement (51) mit einem Schräganschnitt und entsprechender Schottwand (7) gegen das nachfolgende SCR- Katelement (52) angrenzt, wobei dieser Angrenzungsbereich mit der radialen Austrittsgasführung (513) des Vorkatelementes (51) und der radialen Eintrittsgasführung (521) des SCR-Katelementes (52) sich in der zweiten Kammer (3) des Gehäuses (1) befindet. 2. Device according to claim 1, characterized in that in each case the pre-cat element ( 51 ) with a bevel cut and corresponding bulkhead ( 7 ) adjoins the subsequent SCR cat element ( 52 ), this adjoining area with the radial outlet gas duct ( 513 ) of the pre-cat element ( 51 ) and the radial inlet gas guide ( 521 ) of the SCR cat element ( 52 ) is located in the second chamber ( 3 ) of the housing ( 1 ). 3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Ammoniakzuführung in der zweiten Kammer (2) des Gehäuses (1) als Ammoniakeindüsung (6) ausgebildet ist. 3. Apparatus according to claim 1 or 2, characterized in that the ammonia feed in the second chamber ( 2 ) of the housing ( 1 ) is designed as an ammonia injection ( 6 ). 4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die rohrförmigen Katalysatormodule (5) radial perforierte Eintrittsgasführungen (511, 521) und radial perforierte Gasaustrittsführungen (513, 523) aufweisen. 4. The device according to claim 1, characterized in that the tubular catalyst modules ( 5 ) have radially perforated inlet gas guides ( 511 , 521 ) and radially perforated gas outlet guides ( 513 , 523 ). 5. Vorrichtung nach einem oder mehreren der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß mit Abstand von der axialen Austrittsgasführung (523) des SCR-Katelementes (52) jeweils eine Prallscheibe (524) angeordnet ist zur Umlenkung der aus dem SCR-Katelement austretenden Abgase. 5. The device according to one or more of the preceding claims, characterized in that a baffle plate ( 524 ) is arranged at a distance from the axial outlet gas duct ( 523 ) of the SCR cat element ( 52 ) for deflecting the exhaust gases emerging from the SCR cat element. 6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die Prallscheiben (524) jeweils mit zueinander beabstandeten Stegen (525) an der Austrittsseite des SCR-Katelementes (52) angeordnet sind. 6. The device according to claim 5, characterized in that the baffle plates ( 524 ) are each arranged with mutually spaced webs ( 525 ) on the outlet side of the SCR cat element ( 52 ).
DE10140295A 2001-08-16 2001-08-16 Exhaust aftertreatment device for diesel engines Expired - Lifetime DE10140295B4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE10140295A DE10140295B4 (en) 2001-08-16 2001-08-16 Exhaust aftertreatment device for diesel engines

Applications Claiming Priority (1)

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DE10140295A DE10140295B4 (en) 2001-08-16 2001-08-16 Exhaust aftertreatment device for diesel engines

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FR2855767A1 (en) * 2003-06-06 2004-12-10 Area Impianti Spa Catalytic purifier, e.g. for gases, fumes and vapors, has series of independent cells with catalysts connected separately to collector and outlet
DE10331693A1 (en) * 2003-07-14 2005-02-17 Roth-Technik Austria Ges.M.B.H. Exhaust after-treatment or particle filter arrangement of an exhaust system of an internal combustion engine of a commercial vehicle
DE102005025045A1 (en) * 2005-05-30 2006-12-14 J. Eberspächer GmbH & Co. KG exhaust system
DE102005016645B4 (en) * 2005-04-12 2016-04-07 Eberspächer Exhaust Technology GmbH & Co. KG Apparatus for aftertreatment of exhaust gases
CN112879141A (en) * 2021-02-26 2021-06-01 徐州徐工矿业机械有限公司 Post-processing device for reducing smoke intensity of high-power engine of non-road mobile machinery
CN116348195A (en) * 2020-10-22 2023-06-27 康明斯排放处理公司 Exhaust aftertreatment system

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US5829250A (en) * 1994-08-16 1998-11-03 Caterpillar Inc. Series combination catalytic converter

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DE4005189C2 (en) * 1989-02-17 1994-09-01 Toyoda Automatic Loom Works Exhaust gas purification device for a diesel engine
US5367875A (en) * 1992-12-07 1994-11-29 Coltec Industries Inc Automated catalytic reduction system
US5829250A (en) * 1994-08-16 1998-11-03 Caterpillar Inc. Series combination catalytic converter

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2855767A1 (en) * 2003-06-06 2004-12-10 Area Impianti Spa Catalytic purifier, e.g. for gases, fumes and vapors, has series of independent cells with catalysts connected separately to collector and outlet
DE10331693A1 (en) * 2003-07-14 2005-02-17 Roth-Technik Austria Ges.M.B.H. Exhaust after-treatment or particle filter arrangement of an exhaust system of an internal combustion engine of a commercial vehicle
DE10331693B4 (en) * 2003-07-14 2005-11-03 Roth-Technik Austria Ges.M.B.H. Exhaust gas purification arrangement of an exhaust system of an internal combustion engine of a commercial vehicle
DE102005016645B4 (en) * 2005-04-12 2016-04-07 Eberspächer Exhaust Technology GmbH & Co. KG Apparatus for aftertreatment of exhaust gases
DE102005025045A1 (en) * 2005-05-30 2006-12-14 J. Eberspächer GmbH & Co. KG exhaust system
US7836688B2 (en) 2005-05-30 2010-11-23 J. Eberspaecher Gmbh & Co. Kg Exhaust system
CN116348195A (en) * 2020-10-22 2023-06-27 康明斯排放处理公司 Exhaust aftertreatment system
CN112879141A (en) * 2021-02-26 2021-06-01 徐州徐工矿业机械有限公司 Post-processing device for reducing smoke intensity of high-power engine of non-road mobile machinery

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