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WO2015191672A1 - Système d'échappement pour véhicule - Google Patents

Système d'échappement pour véhicule Download PDF

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Publication number
WO2015191672A1
WO2015191672A1 PCT/US2015/035033 US2015035033W WO2015191672A1 WO 2015191672 A1 WO2015191672 A1 WO 2015191672A1 US 2015035033 W US2015035033 W US 2015035033W WO 2015191672 A1 WO2015191672 A1 WO 2015191672A1
Authority
WO
WIPO (PCT)
Prior art keywords
passageway
urea
particulate filter
diesel particulate
exhaust
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/US2015/035033
Other languages
English (en)
Inventor
Homayoun Ahari
Michael G. ZAMMIT
Luis Cattani
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.)
FCA US LLC
Original Assignee
FCA US LLC
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 FCA US LLC filed Critical FCA US LLC
Publication of WO2015191672A1 publication Critical patent/WO2015191672A1/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
    • F01N3/02—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
    • B01D53/9463—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on one brick
    • B01D53/9472—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on one brick in different zones
    • 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
    • F01N3/10—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
    • 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]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2067—Urea
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/80—Type of catalytic reaction
    • B01D2255/808—Hydrolytic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/01—Engine exhaust gases
    • B01D2258/012—Diesel engines and lean burn gasoline engines
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/40—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a hydrolysis catalyst
    • 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
    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • F01N2510/068—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings
    • F01N2510/0682—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings having a discontinuous, uneven or partially overlapping coating of catalytic material, e.g. higher amount of material upstream than downstream or vice versa
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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 present disclosure relates generally to an exhaust system for a vehicle, such as an exhaust system operable to remove nitrogen oxides and particulate matter from exhaust gases.
  • One of the methods for purifying exhaust gas includes the step of injecting aqueous urea into the exhaust passageway to generate ammonia by hydrolysis.
  • the urea decomposes into ammonia and carbon dioxide by being intermixed with the relatively hot and moisture-rich exhaust gas.
  • the ammonia is then utilized with a nitrogen oxide catalyst, such as a selective catalytic reduction (SCR) type catalyst.
  • SCR selective catalytic reduction
  • the temperature of the exhaust gas can fall below 200"C and compromise urea decomposition.
  • the water component of the aqueous urea evaporates before the urea decomposes.
  • the urea then crystallizes and forms undesirable deposits within the system.
  • an exhaust system for a vehicle in accordance with the teachings of the present disclosure.
  • an exhaust system for a vehicle includes a passageway, a selective catalytic reduction system, a diesel particulate filter, a urea injection system, and a hydrolysis catalyst.
  • the passageway is operable to direct a flow of exhaust gas emitted from an engine of the vehicle.
  • the selective catalytic reduction system and the diesel particulate filter are positioned along the passageway spaced from one another.
  • the urea injection system includes an injection port positioned along the passageway upstream of the selective catalytic reduction system.
  • the urea injection system is operable to inject urea into the passageway.
  • the hydrolysis catalyst coats at least a portion of the diesel particulate filter.
  • Urea injected into the passageway through the injection port decomposes into ammonia and carbon dioxide upon contact with the hydrolysis catalyst.
  • the decomposition of the urea is not dependent on mixing the urea with the exhaust gases.
  • a method of treating exhaust from an engine includes the step of arranging a passageway to direct the flow of exhaust.
  • the method also includes the step of positioning a selective catalytic reduction system and a diesel particulate filter along the passageway to treat the exhaust.
  • the method also includes the step of positioning an injection port of a urea injection system along the passageway to inject urea into the passageway upstream of the selective catalytic reduction system.
  • the method also includes the step of coating at least a portion of the diesel particulate filter with a hydrolysis catalyst. Urea injected into the passageway through the injection port decomposes into ammonia and carbon dioxide upon contact with the hydrolysis catalyst. As a result, the decomposition of the urea is not dependent on mixing the urea with the exhaust gases.
  • the positioning of the hydrolysis catalyst can be varied.
  • the hydrolysis catalyst can be arranged on the diesel particulate filter proximate to the injection port rather than on the entire diesel particulate filter.
  • a quantity of hydrolysis catalyst applied to the diesel particulate filter can be minimized.
  • the position of the injection port can be arranged such that the urea is injected at least partially against the flow of exhaust. This can enhance the distribution of urea about the coated portion of the diesel particulate filter.
  • Figure 1 is a schematic view of a first exemplary exhaust system for a vehicle according to the principles of the present disclosure.
  • Figure 2 is a schematic view of a second exemplary exhaust system for a vehicle according to the principles of the present disclosure.
  • exhaust system 10 includes a passageway 12 to direct the flow of exhaust gas.
  • Exhaust gas is referenced in the Figures by arrows, such as arrow 14.
  • Exhaust gas 14 is received from an engine 16.
  • the engine 16, in the exemplary implementation, is a diesel engine.
  • the exhaust system 10 includes a diesel oxidation catalyst 18 in the exemplary implementation.
  • the diesel oxidation catalyst 18 is operable to oxidize several exhaust gas components within the exhaust gas 14, including carbon monoxide, gas phase hydrocarbons, and the organic fraction of diesel particulates.
  • the diesel oxidation catalyst 18 is also operable to reduce the odor of the exhaust gas 14.
  • the exhaust system 10 also includes a diesel particulate filter 20 positioned along the passageway 12.
  • the diesel particulate filter 20 is positioned downstream of the diesel oxidation catalyst 18 along the passageway 12 in the exemplary implementation.
  • the diesel particulate filter 20 is operable to remove or accumulate diesel particulate matter or soot from the exhaust gas 14.
  • the diesel particulate filter 20 is operable to facilitate burning off the accumulated particulate matter.
  • the diesel particulate filter 20 may burn off accumulated particulate through the use of a catalyst or with a fuel burner that heats the diesel particulate filter 20 to a combustion temperature of the particulate.
  • the exhaust system 10 also includes a selective catalytic reduction system 22.
  • the selective catalytic reduction system 22 is spaced downstream from the diesel particulate filter 20.
  • the selective catalytic reduction system 22 is operable to convert nitrogen oxides within the exhaust gas 14 into diatomic nitrogen and water.
  • the exhaust system 10 also includes a urea injection system 24.
  • the urea injection system 24 includes an injection port 26 positioned along the passageway 12 upstream of the selective catalytic reduction system 22.
  • the urea injection system 24 is operable to inject urea into the passageway 12.
  • the injected urea is referenced at 28.
  • the diesel particulate filter 20 is positioned downstream and spaced from the diesel oxidation catalyst 18 and the urea 28 is injected into the space between the diesel oxidation catalyst 18 and the diesel particulate filter 20.
  • the urea 28 is a reductant and is utilized in the selective catalytic reduction system 22 to decompose nitrogen oxides into nitrogen and water. However, the urea 28 itself is first decomposed by a catalyst.
  • Effective decomposition of the urea in current exhaust systems requires that the urea sufficiently mix with the exhaust gas.
  • Sufficient mixing in current exhaust systems is achieved by extending the length of the system in order to increase the amount of time that the urea and the exhaust intermix prior to encountering the selective catalytic reduction system.
  • the extended length increases costs and compromises packaging efficiency of current exhaust systems.
  • Some current systems include a mixer to reduce the amount of extended length.
  • the mixer does not eliminate the need for extended length and also increases the cost and complexity of current exhaust systems.
  • Another challenge associated with effective intermixing of urea and exhaust arises in medium-duty applications. In these applications, the temperature of the exhaust gas can fall below 200°C, which compromises urea decomposition. In such medium-duty systems, the water component of the aqueous urea evaporates before the urea decomposes. As a result, at least some portion of the urea crystallizes and forms deposits within the system.
  • the exhaust system 10 in the exemplary implementation includes a hydrolysis catalyst coating 30 on at least a portion of the diesel particulate filter 20.
  • the diesel particulate filter 20 includes a first portion 32 that is coated with the hydrolysis catalyst coating 30 and a second portion 34 that is not coated with the hydrolysis catalyst coating 30.
  • the first portion 32 is upstream of the second portion 34 and is facing the space between the diesel oxidation catalyst 18 and the diesel particulate filter 20.
  • the urea 28 that is injected into the passageway 12 through the injection port 26 decomposes into ammonia and carbon dioxide upon contact with the hydrolysis catalyst coating 30.
  • the exhaust system 10 is not dependent on the extent of intermixing between the exhaust gas 14 and the urea 28.
  • the hydrolysis catalyst coating 30, in one exemplary implementation is titanium oxide and is wash-coated on the diesel particulate filter 20.
  • the components of the urea 28, ammonia and carbon dioxide travel along the passageway 12 with the exhaust gas 14 from the diesel particulate filter 20 to the selective catalytic reduction system 22.
  • the components of the urea 28 are utilized at the selective catalytic reduction system 22 to convert nitrogen oxides within the exhaust gas 14 into diatomic nitrogen and water.
  • the hydrolysis catalyst coating 30 coats less than a full length of the diesel particulate filter 20 along the passageway 12 in the exemplary implementation.
  • the passageway 12 extends along an axis 36, and the first portion 32 extends less than half of the full length of the diesel particulate filter 20 along the axis 36 in the exemplary implementation.
  • the hydrolysis catalyst coating 30 coats less than one quarter of the diesel particulate filter 20 along the axis 36 in the exemplary implementation.
  • the extent of the hydrolysis catalyst coating 30 on the diesel particulate filter 20 can be selected in view of operation conditions. For example, the extent of coating can be increased if the conversion of nitrogen oxides within the exhaust gas 14 into diatomic nitrogen and water is less than complete. Also, the thickness of the coating can be chosen in view of the desired or expected useful life of the diesel particulate filter 20.
  • an exemplary exhaust system for a vehicle is schematically shown and generally identified at reference numeral 110.
  • the exhaust system 110 includes a passageway 1 12 to direct the flow of exhaust gas 114 received from an engine 1 16.
  • the exhaust system 1 10 also includes a diesel oxidation catalyst 118, a diesel particulate filter 120, a selective catalytic reduction system 122, and a urea injection system 124.
  • the urea injection system 124 includes an injection port 126 positioned along the passageway 112 upstream of the selective catalytic reduction system 122 and downstream of the diesel particular filter 120.
  • the urea injection system 124 is operable to inject urea 128 into the passageway 112.
  • the exhaust system 110 in the exemplary implementation includes a hydrolysis catalyst coating 130 a first portion 132 of the diesel particulate filter 120.
  • a second portion 134 of the diesel particulate filter 20 is uncoated.
  • the urea 128 that is injected into the passageway 112 through the injection port 126 decomposes into ammonia and carbon dioxide upon contact with the hydrolysis catalyst coating 130.
  • the components of the urea 128 travel along the passageway 1 12 with the exhaust gas 114 from the diesel particulate filter 120 to the selective catalytic reduction system 122 and are utilized to convert nitrogen oxides within the exhaust gas 114 into diatomic nitrogen and water.
  • a rearward portion and a forward portion of a diesel particulate filter can be coated with the hydrolysis catalyst in various implementations of the present disclosure.
  • the portion of the diesel particulate filter closest to the injection port can be coated with the hydrolysis catalyst to minimize the extent of coating required.
  • the pattern of the coating on the diesel particulate filter can be selected in view of the relative directions and strengths of the flows of exhaust gas and urea. For example, the interaction of the flows of exhaust and urea can result in a dispersion pattern of the urea solution on the diesel particulate filter. This dispersion pattern can be predicted, for example, using computational fluid dynamics software.
  • the hydrolysis catalyst can be coated on the diesel particulate filter in a pattern predicted by the computational fluid dynamics software.
  • the hydrolysis catalyst coating 30 coats a leading edge of the diesel particulate filter 20 along the passageway 12.
  • the injection port 26 is arranged to direct urea 28 into the passageway 12 in a direction that is transverse to a direction of exhaust flow 14.
  • the injection port 26 is perpendicular to the direction of the exhaust flow 14.
  • the interaction between the flow of urea 28 and the exhaust 14, as well as the flow dynamics associated with the port 26, allow the urea 28 to disperse across the first portion 32 of the diesel particulate filter 20.
  • the dispersed urea 28 contacts the coating of hydrolysis catalyst coating 30 on the first portion 32 and decomposes.
  • the components of the urea 28, ammonia and carbon dioxide then pass through the remainder of the diesel particulate filter 20 with the exhaust 14.
  • the hydrolysis catalyst coating 130 coats a trailing edge of the diesel particulate filter 120 along the passageway 112.
  • the injection port 126 is arranged to direct urea 128 into the passageway 112 in a direction that is transverse to a direction of exhaust flow 114.
  • the direction of the injection port 126 is partialiy opposite to the direction of exhaust flow 14.
  • a vector component of the flow of urea 128 is opposite to the corresponding vector component of the flow of exhaust 1 14.
  • the urea 128 is directed partially upstream of the passageway 112, and the exhaust 114 flows downstream.
  • the dispersed urea 128 contacts the coating of hydrolysis catalyst coating 130 on the first portion 132 and decomposes.
  • the components of the urea 128, ammonia and carbon dioxide, then pass through the remainder of the diesel particulate filter 120 with the exhaust 114.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Materials Engineering (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

La présente invention concerne un système d'échappement (10) destiné à un véhicule et qui comprend un passage (12), un système de réduction catalytique sélectif (22), un filtre à particules Diesel (20), un système d'injection d'urée (24) et un catalyseur d'hydrolyse (32). Le passage (12) est utilisable pour diriger un écoulement de gaz d'échappement émis par un moteur (16) du véhicule. Le système de réduction catalytique sélectif (22) (SCR) et le filtre à particules Diesel (20) (DPF) sont positionnés le long du passage et espacés l'un de l'autre. De manière facultative, un catalyseur d'oxydation peut être positionné en amont du filtre à particules Diesel (20). Au moins une partie (32) du filtre à particules Diesel (20) est revêtue d'un revêtement catalyseur d'hydrolyse (30). Le système d'injection d'urée (24) comprend un orifice d'injection (26) positionné le long du passage en amont ou alors en aval du système de réduction catalytique sélectif (22) et il est utilisable pour injecter de l'urée vers le revêtement catalyseur d'hydrolyse (30) sur le filtre à particules Diesel (20). L'urée injectée se décompose en ammoniac et en dioxyde de carbone lors d'un contact avec le catalyseur d'hydrolyse. Ainsi, la décomposition de l'urée ne dépend pas du mélange de l'urée avec les gaz d'échappement.
PCT/US2015/035033 2014-06-11 2015-06-10 Système d'échappement pour véhicule Ceased WO2015191672A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14/301,707 2014-06-11
US14/301,707 US20150361842A1 (en) 2014-06-11 2014-06-11 Exhaust system for a vehicle

Publications (1)

Publication Number Publication Date
WO2015191672A1 true WO2015191672A1 (fr) 2015-12-17

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Country Link
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WO (1) WO2015191672A1 (fr)

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
US20180347426A1 (en) * 2017-06-06 2018-12-06 GM Global Technology Operations LLC Exhaust gas systems utilizing pre-turbine reductant injectors and methods for controlling the same
WO2022173921A1 (fr) * 2021-02-12 2022-08-18 Corning Incorporated Appareil de traitement d'échappement doté d'un disque cellulaire
CN113750948B (zh) * 2021-09-09 2023-04-28 西安热工研究院有限公司 一种烟气脱硝用尿素催化水解反应器及方法

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GB201200783D0 (en) * 2011-12-12 2012-02-29 Johnson Matthey Plc Substrate monolith comprising SCR catalyst

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DE10226975A1 (de) * 2002-06-17 2004-01-15 Siemens Ag Vorrichtung und Verfahren zur Reinigung von Abgas eines Dieselmotors
EP1890016A2 (fr) * 2006-08-18 2008-02-20 Emitec Gesellschaft für Emissionstechnologie mbH Procédé destiné à l'ajout d'au moins un additif à un flux de gaz d'échappement et dispositif destiné à la préparation d'un flux de gaz d'échappement d'un moteur à combustion interne
JP2009114930A (ja) * 2007-11-06 2009-05-28 Hino Motors Ltd 排気浄化装置
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