DE102014201390A1 - exhaust aftertreatment arrangement - Google Patents
exhaust aftertreatment arrangement Download PDFInfo
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- DE102014201390A1 DE102014201390A1 DE102014201390.9A DE102014201390A DE102014201390A1 DE 102014201390 A1 DE102014201390 A1 DE 102014201390A1 DE 102014201390 A DE102014201390 A DE 102014201390A DE 102014201390 A1 DE102014201390 A1 DE 102014201390A1
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- Germany
- Prior art keywords
- exhaust
- exhaust aftertreatment
- aftertreatment component
- exhaust gas
- gas flow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- 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]
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0842—Nitrogen oxides
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- 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
- F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
-
- 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
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- 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
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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)
- Exhaust Gas After Treatment (AREA)
Abstract
Die vorliegende Erfindung betrifft eine Abgasnachbehandlungsanordnung zur Nachbehandlung von Abgasen eines Verbrennungsmotors, mit einer Abgasnachbehandlungskomponente (13, 23) und einer Bypassleitung (15, 25), über welche diese Abgasnachbehandlungskomponente (13, 23) vom Abgasstrom selektiv umgehbar ist, dadurch gekennzeichnet, dass die Abgasnachbehandlungsanordnung wenigstens eine weitere Abgasnachbehandlungskomponente (17, 27) aufweist, welche einen SCR-Katalysator aufweist.The present invention relates to an exhaust aftertreatment arrangement for the aftertreatment of exhaust gases of an internal combustion engine, comprising an exhaust aftertreatment component (13, 23) and a bypass line (15, 25), over which this exhaust aftertreatment component (13, 23) is selectively bypassed by the exhaust stream, characterized in that Exhaust after-treatment arrangement comprises at least one further exhaust aftertreatment component (17, 27) comprising an SCR catalyst.
Description
Die vorliegende Erfindung betrifft eine Abgasnachbehandlungsanordnung zur Nachbehandlung von Abgasen eines Verbrennungsmotors.The present invention relates to an exhaust aftertreatment arrangement for the aftertreatment of exhaust gases of an internal combustion engine.
Im Abgasnachbehandlungsanordnungen für Magergemisch-Verbrennungsmotoren führt die Speicherung von Stickoxiden (NOx) in NOx-Speicherkatalysatoren jeweils auch zur Speicherung bzw. Ablagerung von Schwefel, was eine Beeinträchtigung der Leistungsfähigkeit des betreffenden NOx-Speicherkatalysators bzw. der Abgasnachbehandlungsanordnung zur Folge hat. Zur Beseitigung der Schwefelablagerungen wird eine Entschwefelung durchgeführt, welche üblicherweise mit einer wechselweisen Einstellung magerer und fetter Betriebszustände bei hohen Temperaturen (typischerweise oberhalb von 550°C) einhergeht. Hierbei tritt das Problem auf, dass einerseits die Einstellung einer zu niedrigen Temperatur dazu führt, dass der Schwefel nicht beseitigt wird, wohingegen anderseits eine zu hohe Temperatur zu einem Sintern der in der jeweiligen Abgasnachbehandlungskomponente befindlichen Platingruppenmetalle (PGM) führt und eine irreversible Deaktivierung der jeweiligen Abgasnachbehandlungskomponente zur Folge hat. In the exhaust aftertreatment arrangements for lean burn internal combustion engines, the storage of nitrogen oxides (NO x ) in NO x storage catalysts also leads to the storage or deposition of sulfur, which has an impairment of the performance of the respective NO x storage catalytic converter or the exhaust aftertreatment arrangement result. Desulphurization is performed to remove the sulfur deposits, which is usually associated with alternate setting of lean and rich operating conditions at high temperatures (typically above 550 ° C). In this case, the problem arises that on the one hand the setting of a too low temperature causes the sulfur is not eliminated, whereas on the other hand too high a temperature leads to sintering in the respective exhaust aftertreatment component platinum group metals (PGM) and irreversible deactivation of the respective Exhaust aftertreatment component has the consequence.
Ein zusätzliches im Betrieb auftretendes Problem ist, das im stromaufwärtigen Abschnitt der Abgasnachbehandlungskomponente (welcher den höchsten Betriebstemperaturen und den fettesten Betriebsbedingungen ausgesetzt ist) während der Entschwefelung desorbierter Schwefel im stromabwärtigen Bereich der Abgasnachbehandlungskomponente (wo geringere Betriebstemperaturen oder nicht hinreichend fette Betriebsbedingungen vorliegen können) wieder absorbiert werden können. Im letzteren Falle wird der Schwefel nicht beseitigt, sondern lediglich umverteilt.An additional operational problem that is re-absorbed in the upstream portion of the exhaust aftertreatment component (which is exposed to the highest operating temperatures and fattest operating conditions) during desulfurized sulfur desulfurization in the downstream portion of the exhaust aftertreatment component (where lower operating temperatures or insufficiently rich operating conditions may exist) can be. In the latter case, the sulfur is not eliminated, but merely redistributed.
Die in
Im Betrieb der Abgasnachbehandlungsanordnung von
Zum Stand der Technik wird beispielhaft auf
Es ist eine Aufgabe der vorliegenden Erfindung, eine Abgasnachbehandlungsanordnung bereitzustellen, welche eine effektivere Abgasnachbehandlung ermöglicht.It is an object of the present invention to provide an exhaust aftertreatment assembly that enables more effective exhaust aftertreatment.
Diese Aufgabe wird durch die Abgasnachbehandlungsanordnung gemäß den Merkmalen des unabhängigen Patentanspruchs 1 gelöst. This object is achieved by the exhaust aftertreatment device according to the features of independent claim 1.
Eine erfindungsgemäße Abgasnachbehandlungsanordnung zur Nachbehandlung von Abgasen eines Verbrennungsmotors mit einer Abgasnachbehandlungskomponente und einer Bypassleitung, über welche diese Abgasnachbehandlungskomponente vom Abgasstrom selektiv umgehbar ist, weist wenigstens eine weitere Abgasnachbehandlungskomponente auf, welche einen SCR-Katalysator aufweist.An exhaust aftertreatment arrangement according to the invention for the after-treatment of exhaust gases of an internal combustion engine with an exhaust aftertreatment component and a bypass line over which this exhaust aftertreatment component is selectively bypassable by the exhaust gas stream, has at least one further exhaust aftertreatment component comprising an SCR catalyst.
Infolge des Vorhandenseins der zusätzlichen, einen SCR-Katalysator aufweisenden Abgasnachbehandlungskomponente kann auch in Betriebsphasen, in welchen der Abgasstrom über die Bypassleitung geführt wird, eine Umwandlung von Stickoxiden (NOx) unter Verwendung der zusätzlichen Abgasnachbehandlungskomponente erfolgen. Hierbei kann die Bypassleitung bereits zur Umleitung des Abgasstroms genutzt werden, sobald die Temperatur unmittelbar vor der zusätzlichen Abgasnachbehandlungskomponente bzw. des SCR-Katalysators ausreichend hoch ist, um eine NOx-Umwandlung in der den SCR-Katalysator aufweisenden Abgasnachbehandlungskomponente zu gewährleisten. Due to the presence of the additional exhaust aftertreatment component having an SCR catalyst, conversion of nitrogen oxides (NO x ) may also be accomplished using the additional exhaust aftertreatment component in operating phases in which the exhaust stream is passed over the bypass line. In this case, the bypass line can already be used to divert the exhaust gas flow, as soon as the temperature immediately before the additional exhaust aftertreatment component or the SCR catalyst is sufficiently high to ensure a NO x conversion in the SCR catalyst having exhaust aftertreatment component.
Weitere Vorteile, welche sich aus dem erfindungsgemäßen Aufbau mit der Kombination einer Bypassleitung zur Umgehung einer Abgasnachbehandlungskomponente während eines Entschwefelungsvorganges mit einer zusätzlichen, einen SCR-Katalysator aufweisenden Abgasnachbehandlungskomponente ergeben können, sind die Reduzierung des Gegendrucks in der Abgasnachbehandlungsanordnung, die zuverlässige Vermeidung eines Sinterns von Platingruppenmetallen (PGM) in einem in einer Abgasnachbehandlungskomponente vorhandenen NOx-Speicherkatalysator unter Betriebsbedingungen mit hoher Last bzw. hoher Temperatur, eine Reduzierung der Schwefelbelastung für den betreffenden NOx-Speicherkatalysator sowie die weitere Optimierung der Auspuffemissionen.Further advantages resulting from the construction according to the invention with the combination of a bypass line for bypassing a Exhaust after-treatment component during a desulfurization process with an additional exhaust aftertreatment component having an SCR catalyst may be the reliable avoidance of platinum group metal (PGM) sintering in an NO x storage catalyst present in an exhaust aftertreatment component under high operating conditions Load or high temperature, a reduction of the sulfur load for the respective NO x storage catalytic converter and the further optimization of the exhaust emissions.
Gemäß einer Ausführungsform ist der SCR-Katalysator auf einem Dieselpartikelfiltersubstrat ausgebildet.According to one embodiment, the SCR catalyst is formed on a diesel particulate filter substrate.
Gemäß einer Ausführungsform ist die weitere Abgasnachbehandlungskomponente bezogen auf den Abgasstrom stromabwärts der Bypassleitung angeordnet.According to one embodiment, the further exhaust aftertreatment component is arranged downstream of the bypass line with respect to the exhaust gas flow.
Gemäß einer Ausführungsform ist die weitere Abgasnachbehandlungskomponente bezogen auf den Abgasstrom stromaufwärts der Bypassleitung angeordnet.According to one embodiment, the further exhaust aftertreatment component is arranged upstream of the bypass line relative to the exhaust gas flow.
Gemäß einer Ausführungsform weist die vom Abgasstrom selektiv umgehbare Abgasnachbehandlungskomponente einen NOx-Speicherkatalysator auf.According to one embodiment, the exhaust gas aftertreatment component selectively bypassable by the exhaust gas flow comprises a NO x storage catalytic converter.
Gemäß einer Ausführungsform ist bezogen auf den Abgasstrom stromaufwärts der Bypassleitung noch eine weitere Abgasnachbehandlungskomponente vorgesehen.According to one embodiment, based on the exhaust gas flow upstream of the bypass line, a further exhaust gas aftertreatment component is provided.
Gemäß einer Ausführungsform weist diese bezogen auf den Abgasstrom stromaufwärts der Bypassleitung vorgesehene Abgasnachbehandlungskomponente einen Dieseloxidationskatalysator auf.According to one embodiment, this exhaust aftertreatment component provided upstream of the bypass line relative to the exhaust gas flow comprises a diesel oxidation catalyst.
Gemäß einer anderen Ausführungsform weist diese bezogen auf den Abgasstrom stromaufwärts der Bypassleitung vorgesehene Abgasnachbehandlungskomponente einen NOx-Speicherkatalysator auf.According to another embodiment, this exhaust gas aftertreatment component provided upstream of the bypass line, based on the exhaust gas flow, has an NO x storage catalytic converter.
Gemäß einer Ausführungsform ist bezogen auf den Abgasstrom stromabwärts der den SCR-Katalysator aufweisenden Abgasnachbehandlungskomponente noch wenigstens eine zusätzliche Abgasnachbehandlungskomponente vorgesehen.According to one embodiment, based on the exhaust gas flow downstream of the exhaust aftertreatment component having the SCR catalytic converter, at least one additional exhaust gas aftertreatment component is provided.
Weitere Ausgestaltung der Erfindung sind der Beschreibung sowie den Unteransprüchen zu entnehmen.Further embodiment of the invention are described in the description and the dependent claims.
Die Erfindung nachstehend anhand von in den beigefügten Abbildungen dargestellten Ausführungsbeispielen näher erläutert.The invention is explained in more detail below with reference to embodiments illustrated in the accompanying drawings.
Es zeigen:Show it:
Im Weiteren werden mögliche Ausführungsformen einer erfindungsgemäßen Abgasnachbehandlungsanordnung unter Bezugnahme auf die schematischen Darstellungen in
Die in
Unmittelbar stromabwärts dieser ersten Abgasnachbehandlungskomponente
Im Betrieb der Abgasnachbehandlungsanordnung von
Das Ventil
Die in
Infolge des Vorhandenseins der zusätzlichen Abgasnachbehandlungskomponente
Im Abgasstrom nach der zweiten Abgasnachbehandlungskomponente
Im Unterschied zur Abgasnachbehandlungsanordnung von
Im Betrieb der Abgasnachbehandlungsanordnung von
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- EP 1148215 B1 [0007] EP 1148215 B1 [0007]
- US 8051647 B2 [0007] US8051647 B2 [0007]
Claims (9)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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DE102014201390.9A DE102014201390A1 (en) | 2014-01-27 | 2014-01-27 | exhaust aftertreatment arrangement |
DE202014100382.7U DE202014100382U1 (en) | 2014-01-27 | 2014-01-29 | exhaust aftertreatment arrangement |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE102014201390.9A DE102014201390A1 (en) | 2014-01-27 | 2014-01-27 | exhaust aftertreatment arrangement |
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DE102014201390A1 true DE102014201390A1 (en) | 2015-07-30 |
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DE102014201390.9A Withdrawn DE102014201390A1 (en) | 2014-01-27 | 2014-01-27 | exhaust aftertreatment arrangement |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3529471A4 (en) * | 2016-10-24 | 2020-04-08 | BASF Corporation | Integrated scr catalyst and lnt for nox abatement |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1148215B1 (en) | 1999-01-25 | 2011-06-29 | Toyota Jidosha Kabushiki Kaisha | Exhaust emission control device of internal combustion engine |
US8051647B2 (en) | 2007-02-23 | 2011-11-08 | Toyota Jidosha Kabushiki Kaisha | Exhaust purification device of internal combustion engine |
-
2014
- 2014-01-27 DE DE102014201390.9A patent/DE102014201390A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1148215B1 (en) | 1999-01-25 | 2011-06-29 | Toyota Jidosha Kabushiki Kaisha | Exhaust emission control device of internal combustion engine |
US8051647B2 (en) | 2007-02-23 | 2011-11-08 | Toyota Jidosha Kabushiki Kaisha | Exhaust purification device of internal combustion engine |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3529471A4 (en) * | 2016-10-24 | 2020-04-08 | BASF Corporation | Integrated scr catalyst and lnt for nox abatement |
US11339701B2 (en) | 2016-10-24 | 2022-05-24 | Basf Corporation | Integrated SCR catalyst and LNT for NOx abatement |
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