WO2004027228A1 - Systeme et procede d'epuration de gaz d'echappement - Google Patents

Systeme et procede d'epuration de gaz d'echappement Download PDF

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Publication number
WO2004027228A1
WO2004027228A1 PCT/DE2003/001932 DE0301932W WO2004027228A1 WO 2004027228 A1 WO2004027228 A1 WO 2004027228A1 DE 0301932 W DE0301932 W DE 0301932W WO 2004027228 A1 WO2004027228 A1 WO 2004027228A1
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WO
WIPO (PCT)
Prior art keywords
exhaust gas
particle filter
storage
purification system
gas purification
Prior art date
Application number
PCT/DE2003/001932
Other languages
German (de)
English (en)
Inventor
Markus Windenmeyer
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 WO2004027228A1 publication Critical patent/WO2004027228A1/fr

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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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/0231—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using special exhaust apparatus upstream of the filter for producing nitrogen dioxide, e.g. for continuous filter regeneration systems [CRT]
    • 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
    • B01D53/9481—Catalyst preceded by an adsorption device without catalytic function for temporary storage of contaminants, e.g. during cold start
    • 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
    • B01D53/9495—Controlling the catalytic process
    • 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
    • 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
    • F01N13/0093—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 of the same type
    • 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, e.g. catalysed diesel particulate filters
    • 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
    • F01N3/0821—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with particulate filters
    • 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
    • F01N3/103—Oxidation catalysts for HC and CO only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—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
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
    • 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 an exhaust gas purification system with a regenerable exhaust gas aftertreatment unit.
  • the invention further relates to a method for purifying exhaust gases, in which an exhaust gas stream is passed through a regenerable exhaust gas aftertreatment unit.
  • the known design measures such as, for example, a favorable combustion chamber design are no longer sufficient to comply with future exhaust gas limit values of internal combustion engines.
  • internal combustion engines whose exhaust gas has a high proportion of oxygen for example diesel engines or gasoline engines with direct fuel injection, require more effort to reduce pollutants, in particular to reduce NO x emissions.
  • An additional problem with the diesel engine is that its particle emissions have to be reduced.
  • the particles contained in the exhaust gas of diesel engines consist largely of soot, which is, for example, in a particle filter can be held back and collected. Such a filter must, however, be regenerated, ie usually burned free, after reaching a certain particle load.
  • a filter must, however, be regenerated, ie usually burned free, after reaching a certain particle load.
  • One possibility for regeneration is to heat the exhaust gases to a temperature of approximately 450 to 650 ° C., which can be done, for example, by metering in hydrocarbons, in particular vaporized or atomized fuel, into the exhaust system upstream of an oxidation catalytic converter.
  • the exothermic conversion to CO, C0 2 and H 2 0 releases the heat required for free burning.
  • the soot is burned off with the help of the oxygen in the exhaust gas. This method has disadvantages due to the relatively high temperatures that arise.
  • nitrogen dioxide is suitable as an oxidizing agent for the carbon-containing soot for the regeneration of the diesel particle filter. This process is suitable for the oxidation of soot at much lower temperatures.
  • the required N0 2 is usually provided by an oxidation catalyst, which contains precious metals and in particular platinum, from the nitrogen monoxide (NO) contained in the exhaust gas.
  • Another way to lower the temperature required for the regeneration of the diesel particle filter is to use catalytically coated diesel particle filters.
  • the catalyst coatings suitable for such processes can also oxidize NO to NO 2 .
  • a catalyst for reducing the ignition temperature of diesel soot is described in DE 31 41 713 AI.
  • the active substance of this known catalyst consists of silver vanada, which can be applied to a filter element serving as a structural amplifier.
  • a monolithic ceramic body is proposed in particular as a structural amplifier.
  • An exhaust gas cleaning system for cleaning the exhaust gas of an internal combustion engine, in particular an internal combustion engine with auto-ignition has an exhaust gas aftertreatment unit with at least one particle filter.
  • the exhaust gas aftertreatment unit also has at least one NO ⁇ store. This can be integrated in the at least one particle filter or upstream of this. With such a configuration, it is possible to burn off the soot accumulated on the filter again without auxiliary materials supplied from the outside and without significant additional fuel consumption of the internal combustion engine and with little additional technical effort.
  • the desorption of NO x takes place primarily thermally and less so that the air-fuel ratio of the combustible mixture of the internal combustion engine is enriched, ie is reduced.
  • the particle filter has a coating with a storage component for storing NO x .
  • the NO x storage can be made from one Carrier material, a so-called washcoat, which can consist of Al 2 0 3 Si0 2 or other materials commonly used for such a purpose and is applied, for example, to a honeycomb body.
  • One embodiment variant provides that the NO x store is located on an oxidation catalytic converter which is connected upstream of the particle filter.
  • the NO x store preferably has nitrogen oxide-storing components or compounds, for example basic oxides and / or noble metals, for example platinum.
  • Nitrogen oxides can be stored in the NO x store, this storage preferably taking place in particular at temperatures at which N0 2 does not react significantly with the soot located in the particle filter. Such temperatures are typically below 300 ° C. At temperatures at which a significant conversion of N0 2 with soot takes place, the nitrogen oxides are released from the NO x storage and are available for soot oxidation.
  • the NO x storage component can be connected upstream of the particle filter or can be integrated into the particle filter. With the invention, it is possible to use NO x in the exhaust gas much better for the purposes of particle filter regeneration.
  • the NO x storage contains basic oxides or compounds which can store nitrogen oxides as main components. Examples of these are alkali and Alkaline earth metals, the lanthanides including yttrium and scandium, as well as Ti0 2 , ZrO 2 , Bi 2 0 3 , copper oxides, silver or silver oxides and lead oxides.
  • the NO x storage catalytic converter components which, in addition to N0 X, can also store larger amounts of oxygen, are not a disadvantage for this application.
  • the NO x storage device can also contain one or more precious metal components, preferably platinum.
  • the NO x storage stores under lean, ie oxygen-rich exhaust gas NOx. It preferably has a high storage capacity at medium temperatures between approx. 150-350 ° C. At higher temperatures above 250-400 ° C, preferably 300-350 ° C, the NO x storage begins to desorb the stored NO x , which is then available for the regeneration of the particle filter.
  • the storage behavior can be influenced by a warming-up device.
  • a heating device can be an electric heater, for example.
  • the exhaust gas temperature can be brought specifically to ranges above 350 ° C, for example immediately after the internal combustion engine starts, where it still emits exhaust gas at relatively low temperatures.
  • the particle filter which can be a surface filter or a depth filter, can furthermore be provided with an active component, the function of which is to support the oxidation of nitrogen monoxide and / or the trapped soot. In this way, very effective exhaust gas cleaning is possible.
  • the exhaust gas aftertreatment system can furthermore have at least one oxidation catalytic converter, which can be arranged, for example, upstream of the at least one particle filter or the at least one NO x store.
  • the oxidation catalytic converter can also be connected downstream of the particle filter or the NO x store.
  • the exhaust gas aftertreatment system can have an additional device for reducing NO x , which is connected downstream of the at least one particle filter.
  • a device can be, for example, a further NO x store, for example a NO x storage catalytic converter.
  • the exhaust gas aftertreatment system can have an additional device for selective catalytic reduction.
  • This device can be connected downstream of the exhaust gas aftertreatment system or integrated into it.
  • the device for selective The catalytic reduction (so-called SCR process) can preferably have a metering device for supplying reducing agents into the exhaust gas flow upstream of the device for selective catalytic reduction. This also enables a further reduction in the nitrogen oxide content in the exhaust gas.
  • SCR process a reducing agent is introduced into the catalyst via a metering system.
  • Common reducing agents are, for example, an aqueous urea solution or diesel fuel.
  • a method for cleaning exhaust gases from an internal combustion engine, in particular a diesel internal combustion engine, in which an exhaust gas flow through an exhaust gas aftertreatment unit. is routed, which comprises at least one particle filter, provides according to the invention that the exhaust gas stream is passed through at least one NO x storage.
  • the exhaust gas flow can either be passed through a NO x accumulator integrated in the particle filter, or successively through the NO x accumulator or the particle filter. Both configurations can have advantages, depending on whether a modular structure or maximum integration of the exhaust gas aftertreatment unit is desired in the smallest space.
  • the nitrogen oxides contained in the exhaust gas are preferably stored in the NO x accumulator at low exhaust gas temperatures between approximately 150 ° C. and approximately 350 ° C. Furthermore, the nitrogen oxides contained in the exhaust gas are preferably released in the NO x storage at higher exhaust gas temperatures above about 300-350 ° C. and react exothermically with soot particles in the particulate particulate filters. In this way, the particle filter can be continuously regenerated.
  • the desorption of the nitrogen oxides in the NO x store can be initiated in a targeted manner by heating the NO x store if necessary by means of an external heater, so that exhaust gas temperatures above 350 ° C can be reached.
  • Oxidation of nitrogen monoxide and / or the stored soot particles can also be supported by active components applied to the particle filter.
  • the exhaust gases can also be passed through an additional oxidation catalyst. This can be connected upstream or downstream of the particle filter or the NO x store. With a very compact exhaust gas cleaning device, a very extensive cleaning effect can be achieved.
  • the exhaust gases can also be passed through a device for selective catalytic reduction, a reducing agent being added to the exhaust gases before or in the device for selective catalytic reduction. In this way, a further reduction in the nitrogen oxide content in the exhaust gas can be achieved.
  • Figure 1 is a schematic representation of an internal combustion engine with an exhaust gas aftertreatment unit in an exhaust duct
  • Figure 2 is a schematic representation of an exemplary configuration of the exhaust gas aftertreatment system.
  • FIG. 1 shows a schematic illustration of an internal combustion engine 2 with an inlet channel 21, in which an adjustable throttle valve 22 for regulating a supply of fresh gas 23 can be arranged, if necessary.
  • the internal combustion engine can be a diesel engine (with compression ignition) or, for example, a gasoline engine (with spark ignition) with direct fuel injection. Both have a relatively high proportion of NO x in the exhaust gas.
  • the diesel engine also emits soot particles to a significant extent.
  • An exhaust gas aftertreatment unit 4 is arranged in an exhaust duct 24 of the internal combustion engine in a housing 43 or in a plurality of separate housings.
  • An exhaust gas stream 41 upstream of the exhaust gas aftertreatment unit 4 is cleaned of soot particles and nitrogen oxides in it and leaves the exhaust gas channel 24 as a cleaned exhaust gas stream 42.
  • the exhaust gas aftertreatment unit 4 has at least one NO x accumulator 44 and a particle filter 45. Further components can optionally be provided and are explained in more detail with reference to the schematic illustration in FIG. 2.
  • the NO x store 44 can be arranged in front of the particle filter 45.
  • both modules 44, 45 can be integrated in one structural unit.
  • the particle filter 45 can optionally be coated with a component that is capable of storing or desorbing N0 X at the temperatures mentioned.
  • An oxidation catalytic converter 47 connected upstream of the NO x store is optional and can also be located behind the particle filter 45.
  • Another optional module is a NO x storage catalytic converter 46 or a device for the selective catalytic reduction of the exhaust gas.
  • a supply device 6 for supplying an active substance 61 for regeneration of the catalyst can be provided in front of the NO x storage catalytic converter 46 or in front of the mentioned device for selective catalytic reduction, so that the active substance 61 can be supplied with the desired amount by means of a metering device 62 Exhaust gas is supplied.
  • Nitrogen oxides are stored in the NO x store 44. This storage takes place in particular at temperatures at which nitrogen dioxide does not react significantly with the soot located in the particle filter 45. Such temperatures are between approx. 150 and 350 ° C. At temperatures at which a significant conversion of nitrogen dioxide with soot takes place, NO x is released from the NO x store and used for the soot oxidation in the particle filter 45. This is regenerated. In this way it is possible to use N0 X in the exhaust gas for the purpose of particle filter regeneration. The soot is burned off at a relatively low temperature level, for example 300 to 450 ° C., since soot is oxidized with the aid of N0 2 at significantly lower temperatures than by means of 0 2 .

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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)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Materials Engineering (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

L'invention concerne un système pour l'épuration des gaz d'échappement d'un moteur à combustion interne, notamment d'un moteur à combustion interne à auto-allumage, présentant une unité de retraitement des gaz d'échappement qui comprend au moins un filtre à particules. Selon l'invention, l'unité de retraitement de gaz d'échappement (4) présente au moins un accumulateur de NOX (44). L'invention concerne en outre un procédé pour l'épuration des gaz d'échappement d'un moteur à combustion interne (2).
PCT/DE2003/001932 2002-09-12 2003-06-11 Systeme et procede d'epuration de gaz d'echappement WO2004027228A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10242303.2 2002-09-12
DE10242303A DE10242303A1 (de) 2002-09-12 2002-09-12 Abgasreinigungsanlage und Verfahren zur Reinigung von Absagen

Publications (1)

Publication Number Publication Date
WO2004027228A1 true WO2004027228A1 (fr) 2004-04-01

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PCT/DE2003/001932 WO2004027228A1 (fr) 2002-09-12 2003-06-11 Systeme et procede d'epuration de gaz d'echappement

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DE (1) DE10242303A1 (fr)
WO (1) WO2004027228A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008042048A1 (fr) * 2006-09-29 2008-04-10 Caterpillar Inc. Gestion de la temperature dans un systeme de traitement d'echappement
US7762060B2 (en) 2006-04-28 2010-07-27 Caterpillar Inc. Exhaust treatment system
FR3042813A1 (fr) * 2015-10-27 2017-04-28 Peugeot Citroen Automobiles Sa Dispositif de post-traitement des gaz d’echappement d’un moteur a combustion
CN111050885A (zh) * 2017-10-20 2020-04-21 优美科股份公司及两合公司 被动氮氧化物吸附催化剂

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10207986A1 (de) * 2002-02-25 2003-09-04 Daimler Chrysler Ag Abgasreinigungsanlage für eine Brennkraftmaschine
FR2873158B1 (fr) * 2004-07-15 2008-11-14 Peugeot Citroen Automobiles Sa Ligne d'echappement d'un moteur a combustion interne, et systeme d'epuration des gaz d'echappement la comprenant
DE102005013707A1 (de) * 2005-03-24 2006-09-28 Daimlerchrysler Ag Kraftfahrzeug mit Brennkraftmaschine und Verfahren zum Betreiben einer Brennkraftmaschine
FR2914946B1 (fr) * 2007-04-12 2009-05-22 Renault Sas Systeme de traitement des gaz d'echappement pour moteur a combustion interne
DE102007035937A1 (de) 2007-07-31 2009-02-05 Daimler Ag Abgasnachbehandlungsanlage und Verfahren zum Behandeln von Abgas
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WO2010041741A1 (fr) * 2008-10-09 2010-04-15 本田技研工業株式会社 Dispositif de purification de gaz d’échappement
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DE102020128786A1 (de) 2020-11-02 2022-05-05 Volkswagen Aktiengesellschaft Verfahren zur Verminderung der Lachgasemissionen eines Verbrennungsmotors sowie Abgasnachbehandlungssystem

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