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WO2004111401A1 - Dispositif d'epuration des gaz d'echappement d'un moteur a combustion et procede associe - Google Patents

Dispositif d'epuration des gaz d'echappement d'un moteur a combustion et procede associe Download PDF

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Publication number
WO2004111401A1
WO2004111401A1 PCT/DE2004/000592 DE2004000592W WO2004111401A1 WO 2004111401 A1 WO2004111401 A1 WO 2004111401A1 DE 2004000592 W DE2004000592 W DE 2004000592W WO 2004111401 A1 WO2004111401 A1 WO 2004111401A1
Authority
WO
WIPO (PCT)
Prior art keywords
catalytic converter
exhaust gas
nitrogen oxides
reducing agent
internal combustion
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.)
Ceased
Application number
PCT/DE2004/000592
Other languages
German (de)
English (en)
Inventor
Johannes Schaller
Wolfram Veigel
Hartmut Lueders
Christian Walz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO2004111401A1 publication Critical patent/WO2004111401A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series
    • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/36—Arrangements for supply of additional fuel
    • 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
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • 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
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/12—Combinations of different methods of purification absorption or adsorption, and catalytic conversion
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • 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
    • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/12—Other methods of operation
    • F02B2075/125—Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a device for cleaning the exhaust gas of an internal combustion engine with an arrangement for selective catalytic reduction.
  • the invention further relates to a method for cleaning exhaust gases from an internal combustion engine, in which an exhaust gas stream is passed through a device for selective catalytic reduction.
  • a suitable reducing agent is, for example, NH 3 , which can be introduced as a gas into the exhaust gas stream.
  • SCR selective catalytic reduction
  • the ammonia is contained in the exhaust gas
  • Nitrogen oxides selectively converted to molecular nitrogen and water are selectively converted to molecular nitrogen and water.
  • One problem the insufficient activity of the known SCR system is to be considered at exhaust temperatures below about 25O 0 C.
  • a prescreening of an oxidation catalyst the one hand ensures a reduction in the proportions of deactivating acting hydrocarbons and on the other hand for oxidation of NO to NO 2, which overall leads to a substantial increase in NOx conversion at exhaust gas temperatures above about 150 0 C.
  • MVEG Motor Vehicles Emissions Expert Group; an expert group of the European Commission
  • a mixing distance of approx. 40 cm can be provided, which may be with a
  • a mixing device for an exhaust gas cleaning system is described in the older German patent application with the file number 101 31 803.0.
  • a mixing body arranged in the exhaust pipe has a gas impact surface and a beam impact surface, so that exhaust gas flowing from the internal combustion engine onto the gas impact surface and transversely to the
  • Exhaust gas feed reductant can hit the jet impact surface.
  • DE 197 40 702 provides, by connecting an adsorption catalyst upstream of a catalyst for selective catalytic reduction, to further reduce the nitrogen oxide emission, in particular when the internal combustion engine is warming up, than is the case with conventional ones
  • the adsorption catalyst is regenerated by supplying fuel after the engine.
  • the device according to the invention and the method according to the invention have the advantage, in contrast, that denitrification of the exhaust gas is ensured with simple means even at low exhaust gas temperatures, the storage catalytic converter regenerating itself without additional means in a regulating manner depending on the temperature of the exhaust gas and the nitrogen oxides released can be eliminated by the existing arrangement for selective catalytic reduction.
  • the storage catalytic converter thus effectively buffers nitrogen oxides as long as the arrangement for selective catalytic reduction has not yet reached its working temperature.
  • a reduction in the NO x emission limit values can be achieved below an amount of NO x emitted, which ensures compliance with the permissible exhaust gas standards during the MVEG test cycle.
  • Such a reduction in the NO x emission can be achieved in that the temperature-resistant one that is already present and used for nitrogen oxidation
  • Oxidation catalyst is used in addition to NOx reduction during a cold start phase. In a close-fitting position of the oxidation catalyst has reached a temperature of more than 100 0 C after about 50 seconds, which is a NO x for reduction by means of NH3 or an NH3-releasing reducing agent is sufficient. Oxidation catalysts mainly have as an active component
  • Precious metals such as platinum. This favors oxidation reactions of hydrocarbons, carbon monoxide and nitrogen monoxide even at low temperatures. If NH3 is injected as a reducing agent, these catalysts show a relatively strong De-NO x activity even at temperatures below 100 ° C.
  • the invention comprises an embodiment with separate and separately controllable supply devices for reducing agents.
  • the switchover device for optionally supplying the reducing agent into the exhaust gas flow upstream or into the oxidation catalytic converter or into the SCR catalytic converter can be designed as a valve, in particular as a 3/2-way valve. In this way, the reducing agent can be supplied either to the oxidation catalytic converter or to the SCR catalytic converter, depending on which temperature levels they have reached while driving.
  • One embodiment of the invention provides that the switching device is designed as a mixing valve. In this way, simultaneous loading of the oxidation and SCR catalysts can take place during a transition period
  • the switching device is preferably temperature-controlled, so that during a cold start phase with still low exhaust gas temperatures, the oxidation catalytic converter and after a warm-up phase, the SCR catalytic converter can be charged with reducing agent.
  • the feed device preferably comprises in each case a metering device for metering quantities and nozzles for distributing or atomizing the reducing agent in the exhaust gas stream.
  • the at least one oxidation catalyst is preferably in the immediate vicinity of one
  • Exhaust gas outlet of the internal combustion engine arranged so that it reaches relatively high temperatures and thus a high cleaning effect after only a short time.
  • ammonia-containing or ammonia-releasing substance for example, can be used as the reducing agent, which can bring about NO x reduction.
  • Urea or ammonium carbamate are examples of such substances.
  • a reducing agent is supplied to the exhaust gas stream, which according to the invention the exhaust gas flow is optionally supplied upstream of or within the at least one oxidation catalytic converter.
  • the reducing agent is fed to both catalysts or only one of the catalysts at a time.
  • Reducing agent is preferably distributed or atomized by means of a nozzle.
  • One embodiment of the method according to the invention provides a temperature-controlled supply of the reducing agent into the oxidation catalyst and / or into the device for selective catalytic reduction.
  • NH3 is applied to the oxidation catalyst, it shows a relatively pronounced de-NO x activity at temperatures above 100 ° C.
  • the usable temperature window for NO x reduction is relatively limited, because above con about 250 ° C to 300 0 C there is no more nitrogen oxide reduction, but an additional Nitrogen oxide production is observed through an oxidation of ammonia. It must therefore be ensured that the oxidation catalyst is only exposed to the reducing agent in a starting phase (in the MVEG test only up to about 350 s).
  • the reducing agent into the oxidation catalytic converter at exhaust gas temperatures of less than about 15O 0 C to 200 0 C is fed in the oxidation catalyst.
  • the SCR catalytic converter After such a period of time, the SCR catalytic converter has normally also reached its working temperature and the reducing agent injection is switched over to the SCR catalytic converter. This can be done at temperatures of about 150 0 C to 200 0 C in the SCR catalyst. Reducing agent metering onto the oxidation catalytic converter is in principle possible at operating points with a low exhaust gas temperature - i.e. not only during a cold start - and provides a very effective NOx reduction potential where the SCR catalytic converter achieves insufficient activity. With an injection in front of the oxidation catalyst up to a time of about 600 s, a significant increase in sales of the exhaust gas cleaning system can be achieved.
  • a suitable meaningful switching point of the temperature-controlled switching valve can at 100 to 200 ° C, preferably at 130 to 180 0 C.
  • a practical embodiment of the system can, for example, provide a 3/2-way changeover valve, which depends on the catalyst temperatures and the
  • the oxidation catalyst can be designed as a catalytically coated particle filter.
  • the catalytic coating of the particle filter has a similar effect to the coating of a known oxidation catalyst.
  • a separate particle filter can be provided, which effects a filtering of the soot particles.
  • the oxidation catalytic converter can be omitted and the additional injection position is in front of the storage catalytic converter.
  • the platinum-containing storage catalytic converter takes over the function of the oxidation catalytic converter.
  • FIG. 1 shows a schematic illustration of an internal combustion engine with an exhaust gas aftertreatment unit in an exhaust gas duct.
  • an oxidation catalytic converter 4 and a device for selective catalytic reduction, referred to as an SCR catalytic converter 6, are arranged.
  • the internal combustion engine 2 has an inlet duct 21 for the supply of fresh gas 22 and outlet ducts 26 which are in a collector 27 to the exhaust duct
  • An exhaust gas turbine 24 of an exhaust gas turbocharger 23 is arranged in the exhaust gas duct and is coupled via a shaft 25 to a compressor (not shown here).
  • the exhaust gas turbocharger 23 is optional and serves to improve the performance and exhaust gas behavior of the internal combustion engine 2.
  • the internal combustion engine 2 is preferably a diesel internal combustion engine with auto-ignition or a gasoline engine with direct fuel injection. Both types of engine each emit a relatively oxygen-rich exhaust gas.
  • the exhaust gas stream 29 successively passes through a storage catalytic converter 111, the oxidation catalytic converter 4 and the SCR catalytic converter 6 and leaves the exhaust gas cleaning system as cleaned
  • Exhaust gas 14 which is passed into the open via a silencer (not shown).
  • the exhaust gas cleaning system furthermore has a feed device 8 for feeding a reducing agent 81 into the exhaust gas stream 29.
  • the feed device 8 comprises a switchover device 83 as well as a first connecting line 84 connected to a first nozzle 85 and a second connecting line 86 connecting to a second nozzle 87.
  • the first nozzle 85 is arranged and serves in the exhaust gas duct 28 upstream of the oxidation catalytic converter 4 for fine distribution or atomization of the reducing agent 81 upstream of the oxidation catalytic converter 4.
  • the second nozzle 87 is upstream of the SCR catalytic converter 6 and downstream of the oxidation catalytic converter 4 arranged and serves to supply reducing agent 81 into the exhaust gas stream 29 upstream of the SCR catalytic converter 6.
  • First and second connecting lines 84, 86 open into the switching device 83, which are used for an optional distribution of the reducing agent to the first and / or second
  • Connection line 84, 86 can provide.
  • the control of the switching device 83 is preferably temperature-dependent, so that the oxidation catalytic converter 4 can be acted upon in a cold-running phase and, after a certain temperature has been reached, the reducing agent 81 can be applied to the SCR catalytic converter 6.
  • the storage catalytic converter located between the exhaust gas turbocharger 23 and the nozzle 85, ie in front of the catalytic converter arrangement 4, can in particular be arranged close to the engine.
  • a storage catalytic converter provided in this way stores the nitrogen oxide emissions of the engine in the low temperature range below 100 ° C. After a certain time, the storage capacity of the storage catalytic converter is exhausted and this allows the nitrogen oxide molecules to pass through. If the storage catalytic converter is heated further, its nitrogen oxide storage capacity decreases and the previously stored amount of nitrogen oxides is released again.
  • the storage catalytic converter arranged close to the engine thus causes a delayed release of the nitrogen oxides.
  • the time delay here is given the appropriate dimensioning of the
  • Storage catalyst preferably at least 300 seconds, so that after exhausting the storage capacity of the storage catalyst, the downstream system for selective catalytic reduction has reached its working temperature and can reduce the nitrogen oxides to nitrogen and water.
  • the storage catalytic converter should have the following properties:
  • Nitrogen oxide storage even at low temperatures Decrease in the storage capacity already at temperatures of approx. 300 ° C. in order to ensure that the storage catalytic converter is driven empty towards the end of a driving cycle during normal driving operation and is available for nitrogen oxide storage at the following cold start; good regenerability solely due to heating, especially good
  • a storage catalytic converter that contains A12O3, CeO2 and ZrO2 and contains platinum in a concentration of approx. 90 g per cubic foot can be used to meet the required properties.
  • a storage catalytic converter that contains A12O3, CeO2 and ZrO2 and contains platinum in a concentration of approx. 90 g per cubic foot can be used to meet the required properties.
  • a typical transition temperature can be approximately 100 ° C. to 200 ° C., preferably approximately 130 to 180 ° C., above which a switchover to
  • the reducing agent 81 can be applied to the SCR catalytic converter 6. Switching can advantageously also take place by means of a mixing valve, which can ensure simultaneous action on the oxidation catalytic converter 4 and the SCR catalytic converter 6 in the region of the transition temperature.
  • the choice of the transition temperature is explained by a clever use of the different operating temperatures of the oxidation catalytic converter and the SCR catalytic converter. This fact is already described in Figures 4 to 6 of the German patent application with the file number 10162383.6; this description is hereby incorporated into the present patent application.
  • the invention also encompasses an alternative configuration which provides two separate feed devices for the oxidation catalytic converter and for the SCR catalytic converter.
  • the oxidation catalyst 4 can be a catalytically coated particle filter which, due to its catalytic coating, has the same effect as a known oxidation catalyst.
  • a separate particle filter can be arranged between the oxidation catalytic converter 4 and the SCR catalytic converter 6. This brings about a further improvement in the cleaning effect of the exhaust gases.
  • the storage catalytic converter and the oxidation catalytic converter or the storage catalytic converter and the catalytically coated filter can be integrated in a single component, so that the nozzle 85 is arranged in front of this single component. This can be done by using an oxidation catalyst Nitric oxide storage capacity. The simultaneous integration of the particle filter takes place via catalytic coating of a particle filter.
  • the oxidation catalyst can also be omitted.

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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

L'invention concerne un dispositif et un procédé pour épurer les gaz d'échappement d'un moteur à combustion. D'après ce dispositif et ce procédé, les gaz d'échappement passent à travers un catalyseur à stockage lors d'une première étape, puis à travers un système de réduction catalytique sélective lors d'une deuxième étape, ce système de réduction catalytique sélective comprenant des moyens servant à acheminer un agent de réduction en aval du moteur. Selon l'invention, le catalyseur à stockage (111) est conçu de façon à pouvoir stocker, en particulier en cas de démarrage à froid du moteur à combustion, au moins partiellement les oxydes d'azote contenus dans les gaz d'échappement tant que le système de réduction catalytique sélective (6) n'a pas atteint sa température de travail. Par ailleurs, le catalyseur à stockage (111) libère les oxydes d'azote stockés jusqu'à présent et laisse passer les oxydes d'azote arrivant nouvellement du moteur à combustion au plus tard lorsque le système de réduction catalytique sélective a atteint sa température de travail, de sorte qu'aussi bien les oxydes d'azote stockés jusqu'à présent que ceux arrivant nouvellement soient réduits à leur sortie du catalyseur à stockage (111).
PCT/DE2004/000592 2003-05-27 2004-03-23 Dispositif d'epuration des gaz d'echappement d'un moteur a combustion et procede associe Ceased WO2004111401A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10324013.6 2003-05-27
DE10324013A DE10324013A1 (de) 2003-05-27 2003-05-27 Vorrichtung zur Reinigung des Abgases einer Brennkraftmaschine und Verfahren hierzu

Publications (1)

Publication Number Publication Date
WO2004111401A1 true WO2004111401A1 (fr) 2004-12-23

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PCT/DE2004/000592 Ceased WO2004111401A1 (fr) 2003-05-27 2004-03-23 Dispositif d'epuration des gaz d'echappement d'un moteur a combustion et procede associe

Country Status (2)

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DE (1) DE10324013A1 (fr)
WO (1) WO2004111401A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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EP2058481A1 (fr) 2006-07-12 2009-05-13 Delphi Technologies, Inc. Dispositif de dosage de fluide
EP2253814A1 (fr) 2006-07-12 2010-11-24 Delphi Technologies Holding S.à.r.l. Dispositif de dosage isolé d'un réactif
EP2336514A2 (fr) 2009-12-15 2011-06-22 Delphi Technologies, Inc. Module de dosage réducteur de liquide avec dispositif de chauffage
EP2336515A2 (fr) 2009-12-15 2011-06-22 Delphi Technologies, Inc. Module de réservoir pour urée
US8122712B2 (en) 2008-01-03 2012-02-28 GM Global Technology Operations LLC Exhaust system with improved NOX emission control
CN103206288A (zh) * 2012-01-13 2013-07-17 通用汽车环球科技运作有限责任公司 排气后处理系统
WO2013127473A1 (fr) * 2012-03-02 2013-09-06 Haldor Topsøe A/S Procédé et système pour l'élimination de composés nocifs à partir de gaz d'échappement
EP2787187A1 (fr) 2013-04-03 2014-10-08 Delphi International Operations Luxembourg S.à r.l. Pompe de dosage de réactif

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DE102008026191B4 (de) 2008-05-30 2020-10-08 Daimler Ag Kraftfahrzeug mit Brennkraftmaschine und einer Abgasnachbehandlungseinrichtung sowie Verfahren zur Partikel- und Stickoxidverminderung
DE102009007765A1 (de) * 2009-02-06 2010-08-12 Daimler Ag Verfahren zum Betreiben einer Brennkraftmaschine mit einer einen SCR-Katalysator umfassenden Abgasreinigungsanlage
CN102575543B (zh) * 2009-10-09 2014-10-29 丰田自动车株式会社 内燃机的排气净化装置
DE102009060758B4 (de) 2009-12-30 2017-10-19 Huber Automotive Ag Vorrichtung und Verfahren zur Reinigung des Abgases einer Brennkraftmaschine
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JP2019190417A (ja) * 2018-04-27 2019-10-31 いすゞ自動車株式会社 排気浄化装置および車両
DE102018219851A1 (de) 2018-11-20 2020-05-20 Robert Bosch Gmbh Abgasnachbehandlungseinrichtung

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WO2007003380A1 (fr) * 2005-07-06 2007-01-11 Emitec Gesellschaft Für Emissionstechnologie Mbh Procede de reduction de la teneur en particules et en oxydes d'azote d'un flux de gaz d'echappement d'un moteur a combustion interne et unite de traitement de gaz d'echappement correspondante
US7563422B2 (en) 2005-07-06 2009-07-21 Emitec Gesellschaft Fuer Emissiontechnologie Mbh Method for reducing a particle and nitrogen oxide proportion in an exhaust gas flow of an internal combustion engine and corresponding exhaust gas treatment unit
EP2058481A1 (fr) 2006-07-12 2009-05-13 Delphi Technologies, Inc. Dispositif de dosage de fluide
EP2253814A1 (fr) 2006-07-12 2010-11-24 Delphi Technologies Holding S.à.r.l. Dispositif de dosage isolé d'un réactif
US8122712B2 (en) 2008-01-03 2012-02-28 GM Global Technology Operations LLC Exhaust system with improved NOX emission control
EP2336514A2 (fr) 2009-12-15 2011-06-22 Delphi Technologies, Inc. Module de dosage réducteur de liquide avec dispositif de chauffage
EP2336515A2 (fr) 2009-12-15 2011-06-22 Delphi Technologies, Inc. Module de réservoir pour urée
CN103206288A (zh) * 2012-01-13 2013-07-17 通用汽车环球科技运作有限责任公司 排气后处理系统
US20150020506A1 (en) * 2012-02-12 2015-01-22 Haldor Topsøe A/S Method and system for the removal of noxious compounds from engine exhaust gas
WO2013127473A1 (fr) * 2012-03-02 2013-09-06 Haldor Topsøe A/S Procédé et système pour l'élimination de composés nocifs à partir de gaz d'échappement
EA027298B1 (ru) * 2012-03-02 2017-07-31 Хальдор Топсёэ А/С Способ и система для удаления вредных соединений из выхлопного газа двигателя
EP2787187A1 (fr) 2013-04-03 2014-10-08 Delphi International Operations Luxembourg S.à r.l. Pompe de dosage de réactif

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