EP1321643B1 - Device and method for after-treatment of exhaust gases - Google Patents
Device and method for after-treatment of exhaust gases Download PDFInfo
- Publication number
- EP1321643B1 EP1321643B1 EP02028305A EP02028305A EP1321643B1 EP 1321643 B1 EP1321643 B1 EP 1321643B1 EP 02028305 A EP02028305 A EP 02028305A EP 02028305 A EP02028305 A EP 02028305A EP 1321643 B1 EP1321643 B1 EP 1321643B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- catalytic converter
- internal combustion
- combustion engine
- nitrogen oxides
- exhaust gases
- 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.)
- Expired - Lifetime
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- 239000007789 gas Substances 0.000 title claims description 28
- 238000000034 method Methods 0.000 title claims description 17
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 74
- 230000003197 catalytic effect Effects 0.000 claims description 27
- 238000002485 combustion reaction Methods 0.000 claims description 18
- 230000003647 oxidation Effects 0.000 claims description 17
- 238000007254 oxidation reaction Methods 0.000 claims description 17
- 239000000446 fuel Substances 0.000 claims description 13
- 239000000919 ceramic Substances 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 description 30
- 239000002245 particle Substances 0.000 description 19
- 230000008929 regeneration Effects 0.000 description 11
- 238000011069 regeneration method Methods 0.000 description 11
- 239000004071 soot Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 2
- 230000003685 thermal hair damage Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910002089 NOx Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
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
- F01N3/02—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
- F01N3/029—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 by adding non-fuel substances to exhaust
- F01N3/0293—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 by adding non-fuel substances to exhaust injecting substances in exhaust stream
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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
- 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
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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
- F01N3/02—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
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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
- F01N3/02—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]
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- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- 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
- F01N3/025—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 fuel burner or by adding fuel to exhaust
- F01N3/0253—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 fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- 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
- 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
- F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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
- F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
- F01N3/0885—Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps
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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
- F01N2250/00—Combinations of different methods of purification
- F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
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- F01N2250/00—Combinations of different methods of purification
- F01N2250/12—Combinations of different methods of purification absorption or adsorption, and catalytic conversion
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- F01N2250/00—Combinations of different methods of purification
- F01N2250/14—Combinations of different methods of purification absorption or adsorption, and filtering
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- 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
- F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
- F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture
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- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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- 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
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- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- 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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- 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
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- 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
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- 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
- F01N3/30—Arrangements for supply of additional air
- F01N3/32—Arrangements for supply of additional air using air pump
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- 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
Definitions
- the invention is based on an arrangement or one Process for the treatment of exhaust gases, in particular one Diesel engine, according to the genre of the independent Expectations.
- DE 199 21 974 already has one Device for reducing harmful components in the Exhaust gas from an internal combustion engine is known, in which one Particulate filter is arranged downstream of a storage catalytic converter. This can lead to a cold start in particular of the engine and / or at low engine load or low Speeds of the motor insufficient efficiency Denitrification of the exhaust gas can be achieved.
- the means and the furnishings complement each other in an ideal way Way, also with regard to soot oxidation, so that Combined exhaust aftertreatment system for simultaneous High reduction of nitrogen oxide and particle emissions Efficiency in denitrification achieved a safe Soot oxidation ensures and thermal damage the system components, especially the agent, safely can be prevented.
- This Auxiliary arrangement advantageously enables Particle filter regeneration or regeneration and / or Desulfation of a denitrification catalyst Facility. This can be done easily by feeding an appropriate amount of an auxiliary, i.e. through a operation of an aid supply unit as required, depending on the desired measure (Particulate filter regeneration, regeneration of the Denitrification catalyst or desulfation of Denitrification catalyst) happen.
- Oxidation catalyst or an electrically heated (Oxidation) catalyst, which works the way support supplied aids in a suitable manner can.
- Fuel in particular, can also be obtained in a simple manner Diesel fuel, used as an aid.
- The also enables the regeneration of the Particulate filter or for regeneration / desulfation of the denitrification catalyst of the facility required Conditions not only through the auxiliary arrangement need to be adjusted, but additional motor Interventions are possible, provided they are the means to Do not endanger the reduction of nitrogen oxides.
- It can in particular be provided over a moderate Late adjustment of the start of injection in the Internal combustion engine already part of the temperature increase to achieve so that the fuel supply on the Auxiliary arrangement quasi as a fine-tuning over the Oxidation catalyst achieved an additional exotherm, so to ensure that those for Diesel particle filter regeneration required temperature is achieved.
- This has the additional advantage that the Process of fuel injection into the Internal combustion engine can be designed more freely, as a fine-tuned post-motor fuel supply the optimal Setting the conditions for exhaust gas aftertreatment guaranteed.
- Figure 1 shows a diesel engine 1, the an exhaust manifold 3 and an exhaust gas turbocharger 5 with an arrangement 2 for exhaust gas aftertreatment is connected.
- the connected to the exhaust gas turbocharger 5 near the engine exhaust pipe 10 leads to one designed as a storage catalytic converter Denitrification catalyst 14.
- a middle exhaust pipe 16 connects the denitrification catalyst 14 with one Oxidation catalyst 20.
- An auxiliary supply unit 18 to supply fuel to the exhaust tract is on the middle exhaust pipe 16 introduced so that fuel behind the denitrification catalyst 14 and before Catalyst 20 can be introduced into the arrangement 2.
- An exhaust gas connection line 22 leads from Oxidation catalyst 20 to a particulate filter 24.
- Ein Denitrification catalyst 26 in the form of a Storage catalytic converter immediately follows that Particle filter 24; the exit of the Denitrification catalyst 26 is not one with one Exhaust pipe 28 shown in more detail connected.
- the storage catalysts 14 and 26 are used for temporary Storage of the nitrogen oxides contained in the exhaust gas. in the so-called regeneration operation by a internal engine and / or a post engine supply of Desorb fuel that is introduced into the exhaust system the nitrogen oxides and are reduced to nitrogen.
- the Particle filter 24 is used to separate the particles a filtering medium. At times a regeneration of the Particle filter take place in which the settled solid or soot particles oxidized to carbon dioxide or carbon monoxide become.
- the storage catalytic converter 14 near the engine reaches after the optimum operating temperature quickly when the engine is started. They are in the position close to the engine in the exhaust system Exhaust gas temperatures so high that immediately after Starting the engine high NOx sales rates can be achieved.
- Thermal damage to the near-engine nitrogen oxide storage catalytic converter 14 will avoid the Exhaust gas temperature via a corresponding control of the Check the fuel supply to the engine so that the near-engine nitrogen oxide storage catalytic converter 14 harmful Exhaust temperatures cannot be reached.
- the for the Regeneration and desulfation of the storage catalytic converter 14 required conditions are about motor Interventions shown.
- a first mode is via the fuel supply unit 18 hydrocarbons in one Amount supplied that with sufficient remaining Residual oxygen content via the oxidation catalyst Temperature increase in the exhaust gas is achieved, which is sufficient is to regenerate the particle filter.
- hydrocarbons in a second Mode are hydrocarbons in such an amount supplied that over the oxidation catalyst reducing atmosphere is generated, so that on the absorbed second nitrogen oxide storage catalyst 26 Nitrogen oxides can be desorbed and reduced to nitrogen.
- a third mode uses hydrocarbons in one such amount timed so that the for a desulfation of the second nitrogen oxide storage catalyst 26 required temperature and the required reducing or alternating reducing / oxidizing atmosphere is represented.
- the storage catalytic converter 14 close to the engine can be of its size be dimensioned so small that it from medium Engine load, or from medium engine speeds, due to the then high space velocities of the exhaust gas only stores little or no nitrogen oxides.
- the below these conditions the storage catalytic converter 14 near the engine Passing nitrogen oxides represent the particulate filter Soot oxidation using nitrogen dioxide is available, whereby the required conversion of nitrogen monoxide too Nitrogen dioxide either on the particle filter upstream oxidation catalytic converter or in the particle filter itself (if it is coated catalytically) can. Because in this process via the particle filter Nitrogen oxides are not reduced, are behind Particulate filters still nitrogen oxides in the following second nitrogen oxide storage catalyst 26 can be stored.
- the engine speeds up the nitrogen oxides only up to the first storage catalytic converter near the engine, while at medium or high loads or speeds only in the particle filter downstream storage catalyst can be stored.
- the soot particles become independent of the operating situation stored in the particle filter 24.
- the Regeneration of the particle filter by adding a catalytic additive to diesel fuel get supported.
- the additive supply can be in the normally provided fuel tank or else after-engine into the exhaust system. It is also possible, only the fuel that over the Aid supply unit 18 in the exhaust tract is introduced to add an additive.
- connection line 22 the output of a secondary air pump be attached to the intended desulfation clocked is operated to be bold together with the then set exhaust gas an oscillation of the lambda value around the To achieve value 1 (so-called "Lambda wobble").
- Figure 2 shows an alternative arrangement 21 to Exhaust aftertreatment, which also has a Exhaust gas turbocharger 5 and an exhaust manifold 3 with a Diesel engine 1 is connected. Same or Similar components as in Figure 1 are the same Provide reference numerals and will not be repeated described.
- the arrangement 2 an integrated exhaust gas aftertreatment 30, in which is a denitrification catalyst and a diesel particulate filter are integrated on a ceramic block. Unit 30 therefore takes over the function of separately in Figure 1 executed units 24 and 26. It is also in the Unit 30 of the denitrification catalyst to the particle filter downstream.
- the mode of operation is the same as that in FIG. 1 .
- the use of an integrated Exhaust aftertreatment unit 30 enables a compact, space-saving arrangement and enables, for example, behind the oxidation catalyst 20 several Denitrification catalysts and particle filters in alternate order.
- oxidation catalyst 20 As well in Figure 1 a heatable catalyst or a heated oxidation catalyst can be used.
- Aid supply unit 18 can be, for example Arrangement used as in the German Patent application with the file number 44 36 415.6 described is.
Description
Die Erfindung geht aus von einer Anordnung bzw. von einem Verfahren zur Nachbehandlung von Abgasen, insbesondere einer Dieselbrennkraftmaschine, nach der Gattung der unabhängigen Ansprüche. Aus der DE 199 21 974 ist bereits eine Vorrichtung zum Reduzieren von schädlichen Bestandteilen im Abgas einer Brennkraftmaschine bekannt, bei der einem Partikelfilter ein Speicherkatalysator nachgeordnet ist. Dies kann dazu führen, daß insbesondere bei einem Kaltstart des Motors und/oder bei niedriger Motorlast bzw. niedrigen Drehzahlen des Motors keine ausreichenden Wirkungsgrade zur Entstickung des Abgases erzielt werden.The invention is based on an arrangement or one Process for the treatment of exhaust gases, in particular one Diesel engine, according to the genre of the independent Expectations. DE 199 21 974 already has one Device for reducing harmful components in the Exhaust gas from an internal combustion engine is known, in which one Particulate filter is arranged downstream of a storage catalytic converter. This can lead to a cold start in particular of the engine and / or at low engine load or low Speeds of the motor insufficient efficiency Denitrification of the exhaust gas can be achieved.
Die erfindungsgemäße Anordnung bzw. das erfindungsgemäße Verfahren mit den kennzeichnenden Merkmalen der unabhängigen Ansprüche haben demgegenüber den Vorteil, daß unabhängig von der Betriebssituation der Brennkraftmaschine hohe Wirkungsgrade bei der Entstickung des Abgases erzielt werden können. Hierbei übernimmt eine Einrichtung der Anordnung die Entstickung, insbesondere bei warmem Motor bzw. bei mittleren und hohen Drehzahlen bzw. Motorlasten, während das vorgeordnete Mittel in vorteilhafter Weise die Entstickung insbesondere bei niedriger Last und/oder niedriger Drehzahl der Brennkraftmaschine gewährleistet. Damit können insbesondere bei Verbrennungsmotoren mit Selbst- bzw. Kompressionszündung (Dieselverfahren) die Abgasnormen EURO 5 bzw. die Vorgaben auf dem US-amerikanischen Markt für SULEV-Anwendungen erfüllt werden.The arrangement according to the invention or the one according to the invention Process with the characteristic features of the independent In contrast, claims have the advantage that regardless of the operating situation of the internal combustion engine high Efficiencies in the denitrification of the exhaust gas can be achieved can. Here, a device of the arrangement takes over Denitrification, especially when the engine is warm or when medium and high speeds or engine loads, while the upstream means advantageously denitrification especially at low load and / or low speed the internal combustion engine guaranteed. So that can especially for internal combustion engines with self- or Compression ignition (diesel process) the EURO 5 emissions standards or the requirements on the US market for SULEV applications be fulfilled.
Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der in den unabhängigen Ansprüchen angegebenen Anordnung bzw. der angegebenen Verfahren möglich.By those listed in the dependent claims Measures are advantageous training and Improvements in the independent claims specified arrangement or the specified method possible.
Wird das Mittel in geeigneter Weise dimensioniert, so ergänzen sich das Mittel und die Einrichtung in idealer Weise, auch hinsichtlich der Rußoxidation, so daß das kombinierte Abgasnachbehandlungssystem zur simultanen Verringerung von Stickoxid- und Partikelemissionen hohe Wirkungsgrade bei der Entstickung erzielt, eine sichere Rußoxidation gewährleistet und eine thermische Schädigung der Systemkomponenten, speziell des Mittels, sicher verhindert werden kann.If the agent is dimensioned in a suitable manner, then the means and the furnishings complement each other in an ideal way Way, also with regard to soot oxidation, so that Combined exhaust aftertreatment system for simultaneous High reduction of nitrogen oxide and particle emissions Efficiency in denitrification achieved a safe Soot oxidation ensures and thermal damage the system components, especially the agent, safely can be prevented.
Insbesondere vorteilhaft ist es, zwischen dem Mittel und der Einrichtung eine Hilfsanordnung vorzusehen, mit deren Hilfe ein Hilfsmittel zur Unterstützung der Abgasnachbehandlung in der Einrichtung dem Abgastrakt zugeführt werden kann. Diese Hilfsanordnung ermöglicht in vorteilhafter Weise eine Partikelfilter-Regeneration bzw. eine Regeneration und/oder Desulfatisierung eines Entstickungskatalysators der Einrichtung. Dies kann in einfacher Weise durch die Zufuhr einer geeigneten Menge eines Hilfsmittels, d.h. durch einen bedarfsgerechten Betrieb einer Hilfsmittel-Zuführungseinheit, je nach gewünschter Maßnahme (Partikelfilter-Regeneration, Regeneration des Entstickungskatalysators oder Desulfatisierung des Entstickungskatalysators) geschehen.It is particularly advantageous between the agent and the To provide an auxiliary arrangement, with whose help a tool to support exhaust aftertreatment in the device can be supplied to the exhaust system. This Auxiliary arrangement advantageously enables Particle filter regeneration or regeneration and / or Desulfation of a denitrification catalyst Facility. This can be done easily by feeding an appropriate amount of an auxiliary, i.e. through a operation of an aid supply unit as required, depending on the desired measure (Particulate filter regeneration, regeneration of the Denitrification catalyst or desulfation of Denitrification catalyst) happen.
Weiterhin vorteilhaft ist das Vorsehen eines Oxidationskatalysators oder eines elektrisch beheizbaren (Oxidations-) Katalysators, der die Wirkungsweise des zugeführten Hilfsmittels in geeigneter Weise unterstützen kann.It is also advantageous to provide one Oxidation catalyst or an electrically heated (Oxidation) catalyst, which works the way support supplied aids in a suitable manner can.
In einfacher Weise kann auch Kraftstoff, insbesondere Dieselkraftstoff, als Hilfsmittel verwendet werden. Das ermöglicht darüber hinaus, daß die für die Regeneration des Partikelfilters bzw. für die Regenerierung/Desulfatisierung des Entstickungskatalysators der Einrichtung erforderlichen Bedingungen nicht alleine über die Hilfsanordnung eingestellt werden müssen, sondern zusätzliche motorische Eingriffe möglich werden, sofern sie das Mittel zur Reduktion von Stickoxiden nicht gefährden. Dabei kann insbesondere vorgesehen sein, über eine moderate Spätverstellung des Einspritzbeginns in der Brennkraftmaschine bereits einen Teil der Temperaturerhöhung zu erzielen, so daß die Kraftstoffzufuhr über die Hilfsanordnung quasi als Feinabstimmung über den Oxidationskatalysator eine zusätzliche Exotherme erzielt, so daß sichergestellt wird, daß die für die Dieselpartikelfilterregeneration erforderliche Temperatur erreicht wird. Dies hat den zusätzlichen Vorteil, daß das Verfahren der Kraftstoffeinspritzung in die Brennkraftmaschine freier gestaltet werden kann, da eine feinoptimierte nachmotorische Kraftstoffzufuhr die optimale Einstellung der Bedingungen zur Abgasnachbehandlung gewährleistet. Fuel, in particular, can also be obtained in a simple manner Diesel fuel, used as an aid. The also enables the regeneration of the Particulate filter or for regeneration / desulfation of the denitrification catalyst of the facility required Conditions not only through the auxiliary arrangement need to be adjusted, but additional motor Interventions are possible, provided they are the means to Do not endanger the reduction of nitrogen oxides. It can in particular be provided over a moderate Late adjustment of the start of injection in the Internal combustion engine already part of the temperature increase to achieve so that the fuel supply on the Auxiliary arrangement quasi as a fine-tuning over the Oxidation catalyst achieved an additional exotherm, so to ensure that those for Diesel particle filter regeneration required temperature is achieved. This has the additional advantage that the Process of fuel injection into the Internal combustion engine can be designed more freely, as a fine-tuned post-motor fuel supply the optimal Setting the conditions for exhaust gas aftertreatment guaranteed.
Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein erstes Ausführungsbeispiel und Figur 2 ein zweites Ausführungsbeispiel.Embodiments of the invention are in the drawing shown and in the description below explained. 1 shows a first embodiment and Figure 2 shows a second embodiment.
Figur 1 zeigt eine Dieselbrennkraftmaschine 1, die über
einen Abgaskrümmer 3 und über einen Abgasturbolader 5 mit
einer Anordnung 2 zur Abgasnachbehandlung verbunden ist. Die
mit dem Abgasturbolader 5 verbundene motornahe Abgasleitung
10 führt zu einem als Speicherkatalysator ausgeführten
Entstickungskatalysator 14. Eine mittlere Abgasleitung 16
verbindet den Entstickungskatalysator 14 mit einem
Oxidationskatalysator 20. Eine Hilfsmittel-Zuführungseinheit
18 zur Zufuhr von Kraftstoff in den Abgastrakt ist an der
mittleren Abgasleitung 16 eingebracht, so daß Kraftstoff
hinter dem Entstickungskatalysator 14 und vor dem
Katalysator 20 in die Anordnung 2 eingebracht werden kann.
Eine Abgasverbindungsleitung 22 führt vom
Oxidationskatalysator 20 zu einem Partikelfilter 24. Ein
Entstickungskatalysator 26 in Form eines
Speicherkatalysators schließt sich unmittelbar an das
Partikelfilter 24 an; der Ausgang des
Entstickungskatalysators 26 ist mit einem zu einem nicht
näher dargestellten Schalldämpfer führenden Auspuffrohr 28
verbunden.Figure 1 shows a diesel engine 1, the
an exhaust manifold 3 and an
Die Speicherkatalysatoren 14 und 26 dienen zur temporären
Einspeicherung der im Abgas enthaltenen Stickoxide. Im
sogenannten Regenerationsbetrieb, der durch eine
innermotorische und/oder eine nachmotorische Zufuhr von
Kraftstoff in den Abgastrakt eingeleitet wird, desorbieren
die Stickoxide und werden zu Stickstoff reduziert. Das
Partikelfilter 24 dient zur Abscheidung der Partikel durch
ein filterndes Medium. Zeitweise muß eine Regeneration des
Partikelfilters erfolgen, bei der die abgesetzten Feststoff-
bzw. Rußpartikel zu Kohlendioxid bzw. Kohlenmonoxid oxidiert
werden. Der motornahe Speicherkatalysator 14 erreicht nach
einem Motorstart schnell seine optimale Betriebstemperatur.
In der motornahen Position im Abgassystem sind die
Abgastemperaturen so hoch, daß auch unmittelbar nach dem
Start des Motors hohe NOx-Umsatzraten erzielt werden können.
Um eine thermische Schädigung des motornahen Stickoxid-Speicherkatalysators
14 zu vermeiden, wird die
Abgastemperatur über eine entsprechende Steuerung der
Kraftstoffzufuhr zum Motor so kontrolliert, daß für den
motornahen Stickoxid-Speicherkatalysator 14 schädliche
Abgastemperaturen nicht erreicht werden. Die für die
Regeneration und Desulfatisierung des Speicherkatalysators
14 erforderlichen Bedingungen werden über motorische
Eingriffe dargestellt. Vor dem Partikelfilter 24 und dem ihm
folgenden zweiten Stickoxid-Speicherkatalysator 26 befindet
sich eine Kraftstoff-Zuführungseinheit 18 sowie ein
Oxidationskatalysator 20, die durch geeignete Ansteuerung in
verschiedenen Betriebsweisen eingesetzt werden können. In
einem ersten Modus werden über die Kraftstoff-Zuführungseinheit
18 Kohlenwasserstoffe in einer solchen
Menge zugeführt, daß bei ausreichendem verbleibendem
Restsauerstoffgehalt über den Oxidationskatalysator eine
Temperaturerhöhung im Abgas erzielt wird, die ausreichend
ist, um das Partikelfilter zu regenerieren. In einem zweiten
Modus werden Kohlenwasserstoffe in einer solchen Menge
zugeführt, daß über den Oxidationskatalysator eine
reduzierende Atmosphäre erzeugt wird, so daß die auf dem
zweiten Stickoxid-Speicherkatalysator 26 absorbierten
Stickoxide desorbiert und zu Stickstoff reduziert werden. In
einem dritten Modus werden Kohlenwasserstoffe in einer
solchen Menge zeitlich geregelt so zugeführt, daß die für
eine Desulfatisierung des zweiten Stickoxid-Speicherkatalysators
26 erforderliche Temperatur sowie die
erforderliche reduzierende bzw. alternierend
reduzierende/oxidierende Atmosphäre dargestellt wird.The
Der motornahe Speicherkatalysator 14 kann von seiner Größe
her so klein dimensioniert werden, daß er ab mittlerer
Motorlast, respektive ab mittleren Motordrehzahlen, aufgrund
der dann hohen Raumgeschwindigkeiten des Abgases nur noch
wenig oder gar keine Stickoxide einspeichert. Die unter
diesen Bedingungen den motornahen Speicherkatalysator 14
passierenden Stickoxide stehen dem Partikelfilter für eine
Rußoxidation mittels Stickstoffdioxid zur Verfügung, wobei
die erforderliche Konvertierung von Stickstoffmonoxid zu
Stickstoffdioxid entweder auf dem dem Partikelfilter
vorgeschalteten Oxidationskatalysator oder im Partikelfilter
selbst (sofern es katalytisch beschichtet ist) erfolgen
kann. Da bei diesem Prozeß über den Partikelfilter
Stickoxide nicht reduziert werden, liegen hinter den
Partikelfiltern noch Stickoxide vor, die im nachfolgenden
zweiten Stickoxid-Speicherkatalysator 26 gespeichert werden.
So gelangen also bei niedriger Last bzw. niedrigen
Drehzahlen des Motors die Stickoxide nur bis zum ersten
motornahen Speicherkatalysator, während sie bei mittleren
oder hohen Lasten bzw. Drehzahlen erst im dem Partikelfilter
nachgeordneten Speicherkatalysator eingespeichert werden.
Unabhängig von der Betriebssituation werden die Rußpartikel
im Partikelfilter 24 eingespeichert.The storage
In einer weiteren alternativen Ausführungsform kann die
Regeneration des Partikelfilters durch Zugabe eines
katalytisch wirkenden Additivs zum Dieselkraftstoff
unterstützt werden. Die Additiv-Zufuhr kann hierbei in den
normal vorgesehenen Kraftstofftank oder aber auch
nachmotorisch in den Abgastrakt hinein erfolgen. Es ist
ebenfalls möglich, lediglich den Kraftstoff, der über die
Hilfsmittel-Zuführungseinheit 18 in den Abgastrakt
eingeführt wird, mit einem Additiv zu versetzen.In a further alternative embodiment, the
Regeneration of the particle filter by adding a
catalytic additive to diesel fuel
get supported. The additive supply can be in the
normally provided fuel tank or else
after-engine into the exhaust system. It is
also possible, only the fuel that over the
In einer weiteren alternativen Ausführungsform kann an der
Verbindungsleitung 22 der Ausgang einer Sekundärluftpumpe
angebracht sein, die bei einer vorgesehenen Desulfatisierung
getaktet betrieben wird, um zusammen mit dem dann fett
eingestellten Abgas ein Oszillieren des Lambdawerts um den
Wert 1 zu erzielen (sogenanntes "Lambda-Wobbeln").In a further alternative embodiment, the
Figur 2 zeigt eine alternative Anordnung 21 zur
Abgasnachbehandlung, die ebenfalls über einen
Abgasturbolader 5 und einen Abgaskrümmer 3 mit einer
Dieselbrennkraftmaschine 1 verbunden ist. Gleiche oder
ähnliche Bestandteile wie in Figur 1 sind mit gleichen
Bezugszeichen versehen und werden nicht nochmals
beschrieben. Im Unterschied zu Figur 1 weist die Anordnung
nach Figur 2 eine integrierte Abgasnachbehandlung 30 auf, in
der ein Entstickungskatalysator und ein Dieselpartikelfilter
auf einem keramischen Block integriert sind. Die Einheit 30
übernimmt also die Funktion der in Figur 1 getrennt
ausgeführten Einheiten 24 und 26. Dabei ist auch bei der
Einheit 30 der Entstickungskatalysator dem Partikelfilter
nachgeordnet.Figure 2 shows an
Die Funktionsweise ist die gleiche wie die in Figur 1
beschriebene. Die Verwendung einer integrierten
Abgasnachbehandlungseinheit 30 ermöglicht eine kompakte,
platzsparende Anordnung und ermöglicht es beispielsweise,
hinter dem Oxidationskatalysator 20 mehrerer
Entstickungskatalysatoren und Partikelfilter in
alternierender Reihenfolge anzuordnen. The mode of operation is the same as that in FIG. 1
. described The use of an integrated
Alternativ zu einem Oxidationskatalysator 20 kann (wie auch
in Figur 1) ein beheizbarer Katalysator oder auch ein
beheizbarer Oxidationskatalysator eingesetzt werden. Als
Hilfsmittel-Zuführungseinheit 18 kann beispielsweise eine
Anordnung verwendet werden, wie sie in der deutschen
Patentanmeldung mit dem Aktenzeichen 44 36 415.6 beschrieben
ist.As an alternative to an oxidation catalyst 20 (as well
in Figure 1) a heatable catalyst or a
heated oxidation catalyst can be used. As
Claims (18)
- Arrangement for the aftertreatment of exhaust gases from an internal combustion engine (1), in particular a diesel internal combustion engine, having a device for eliminating particulates and nitrogen oxides, it being possible for the exhaust gases to flow through the device, characterized in that upstream of the device (24, 26; 30) there is a means (14) for reducing nitrogen oxides connected to the device via an exhaust pipe (16, 22), the means being arranged in the vicinity of the internal combustion engine, so that the exhaust gases heat the means to a greater extent than the device, and therefore the means can reduce nitrogen oxides in operating situations of the internal combustion engine in which the device is not active in this respect, in particular at a low load and/or low speed of the internal combustion engine.
- Arrangement according to Claim 1, characterized in that the means is dimensioned in such a way that above medium engine speeds or above medium engine load, it is outside its working range and allows the nitrogen oxides to pass through it, so that they are available to the device for eliminating particulates.
- Arrangement according to Claim 1 or 2, characterized in that an auxiliary arrangement (18, 20) is provided between the means (14) and the device (24, 26; 30), the auxiliary arrangement having a feed unit (18) for auxiliary medium, which is used to supply an auxiliary medium in order to boost the exhaust-gas aftertreatment in the device (24, 26; 30).
- Arrangement according to Claim 3, characterized in that the feed unit (18) for auxiliary medium can supply fuel.
- Arrangement according to Claim 3 or 4, characterized in that the auxiliary arrangement (18, 20) has a catalytic converter, in particular an oxidation catalytic converter or an electrically heatable catalytic converter, optionally an electrically heatable oxidation catalytic converter, arranged downstream of the feed unit (18) for auxiliary medium, in order to boost at least partial combustion of the auxiliary medium.
- Arrangement according to one of the preceding claims, characterized in that the means (14) is a deNOx catalytic converter, in particular a storage catalytic converter.
- Arrangement according to one of the preceding claims, characterized in that the device (24, 26; 30) comprises a particulate filter (24), in particular a catalytically coated particulate filter.
- Arrangement according to one of the preceding claims, characterized in that the device (24, 26; 30) includes a deNOx catalytic converter (26), in particular a storage catalytic converter.
- Arrangement according to Claims 7 and 8, characterized in that the particulate filter and the deNOx catalytic converter of the device (30) are integrated on a block, in particular on a ceramic block.
- Method for the aftertreatment of exhaust gases from an internal combustion engine, in particular a diesel internal combustion engine, in which the exhaust gases flow through a device for eliminating particulates and nitrogen oxides, characterized in that the exhaust gases, before they enter the device (24, 26; 30) first of all interact, in the vicinity of the internal combustion engine, with a means (14) for reducing nitrogen oxides and then pass through an exhaust pipe (16, 22) leading to the device, so that the exhaust gases heat the means to a greater extent than the device, and therefore the means is able to reduce nitrogen oxides in operating situations of the internal combustion engine in which the device is not active in this respect, in particular at low load and/or low speed of the internal combustion engine.
- Method according to Claim 10, characterized in that the means is dimensioned in such a way that beyond medium engine speeds or beyond medium engine load it is outside its working range and allows the nitrogen oxides to pass through it, so that they are available to the device for eliminating particulates.
- Method according to Claim 10 or 11, characterized in that an auxiliary medium for boosting the exhaust-gas aftertreatment in the device (24, 26; 30) is fed to the exhaust gases in the region of the exhaust pipe (16, 22).
- Method according to Claim 12, characterized in that the auxiliary medium used is fuel.
- Method according to Claim 12 or 13, characterized in that an at least partial combustion of the auxiliary medium is catalytically boosted.
- Method according to one of the preceding claims, characterized in that the means (14) used is a deNOx catalytic converter, in particular a storage catalytic converter.
- Method according to one of the preceding method claims, characterized in that the device (24, 26; 30) comprises a particulate filter (24), in particular a catalytically coated particulate filter.
- Method according to one of the preceding claims, characterized in that the device (24, 26; 30) includes a deNOx catalytic converter (26), in particular a storage catalytic converter.
- Method according to Claims 16 and 17, characterized in that the particulate filter and the deNOx catalytic converter of the device (30) are integrated on a block, in particular on a ceramic block.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE10162383A DE10162383A1 (en) | 2001-12-19 | 2001-12-19 | Arrangement and method for the treatment of exhaust gases |
DE10162383 | 2001-12-19 |
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EP1321643A1 EP1321643A1 (en) | 2003-06-25 |
EP1321643B1 true EP1321643B1 (en) | 2004-10-13 |
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JPH0441914A (en) * | 1990-06-01 | 1992-02-12 | Nissan Motor Co Ltd | Exhaust gas processor for internal combustion engine |
DE19543219C1 (en) * | 1995-11-20 | 1996-12-05 | Daimler Benz Ag | Diesel engine operating method |
DE19921974A1 (en) * | 1999-05-12 | 2000-11-16 | Volkswagen Ag | Device for reducing pollutant components in IC engine exhaust gas comprises an exhaust gas line containing an oxidation catalyst, a particle filter and a nitrogen oxides storage catalyst |
US6167696B1 (en) * | 1999-06-04 | 2001-01-02 | Ford Motor Company | Exhaust gas purification system for low emission vehicle |
DE19932790A1 (en) * | 1999-07-14 | 2001-01-18 | Volkswagen Ag | Exhaust gas purification device for an internal combustion engine and regeneration method for this device |
DE19945260A1 (en) * | 1999-09-21 | 2001-03-22 | Bayerische Motoren Werke Ag | Process for the simultaneous reaction of nitrogen oxides and soot particles in the exhaust gas of a diesel engine comprises feeding the exhaust gas that has been passed over |
DE10023439A1 (en) * | 2000-05-12 | 2001-11-22 | Dmc2 Degussa Metals Catalysts | Process for removing nitrogen oxides and soot particles from the lean exhaust gas of an internal combustion engine and exhaust gas purification system therefor |
-
2001
- 2001-12-19 DE DE10162383A patent/DE10162383A1/en not_active Ceased
-
2002
- 2002-12-17 DE DE2002501277 patent/DE50201277D1/en not_active Expired - Lifetime
- 2002-12-17 EP EP02028305A patent/EP1321643B1/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7930881B2 (en) | 2003-03-08 | 2011-04-26 | Johnson Matthey Public Limited Company | Exhaust system for lean burn IC engine including particulate filter and NOx absorbent |
CN101091039B (en) * | 2004-12-23 | 2010-05-12 | 乌米科雷股份两合公司 | Method for monitoring the nitrogen oxide storage capacity of a nitrogen oxide storage catalyst used in the form of a primary catalytic converter |
Also Published As
Publication number | Publication date |
---|---|
DE10162383A1 (en) | 2003-07-17 |
DE50201277D1 (en) | 2004-11-18 |
EP1321643A1 (en) | 2003-06-25 |
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