[go: up one dir, main page]

US20150361842A1 - Exhaust system for a vehicle - Google Patents

Exhaust system for a vehicle Download PDF

Info

Publication number
US20150361842A1
US20150361842A1 US14/301,707 US201414301707A US2015361842A1 US 20150361842 A1 US20150361842 A1 US 20150361842A1 US 201414301707 A US201414301707 A US 201414301707A US 2015361842 A1 US2015361842 A1 US 2015361842A1
Authority
US
United States
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.)
Abandoned
Application number
US14/301,707
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
Priority to US14/301,707 priority Critical patent/US20150361842A1/en
Assigned to CHRYSLER GROUP LLC reassignment CHRYSLER GROUP LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AHARI, HOMAYOUN, CATTANI, LUI, ZAMMIT, MICHAEL G
Assigned to FCA US LLC reassignment FCA US LLC CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: CHRYSLER GROUP LLC
Priority to PCT/US2015/035033 priority patent/WO2015191672A1/fr
Publication of US20150361842A1 publication Critical patent/US20150361842A1/en
Abandoned legal-status Critical Current

Links

Images

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.
  • the exhaust system 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.
  • An injector portion of the urea system will be located downstream or upstream of the coated portion of the diesel particulate filter to inject urea into the diesel particulate filter passageways.
  • 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 in accordance with the teachings of the present disclosure.
  • the method includes providing a passageway to direct the flow of exhaust.
  • the method also includes providing a selective catalytic reduction system and a diesel particulate filter along the passageway to treat the exhaust.
  • An injection port of a urea injection system is provided along the passageway to inject urea into the passageway upstream of the selective catalytic reduction system.
  • the method also includes providing a hydrolysis catalyst coating on 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. 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. As a result, 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.
  • the exhaust system includes a diesel oxidation catalyst positioned along the passageway upstream of and spaced from the diesel particulate filter.
  • the urea injection system is positioned between the diesel oxidation catalyst and the diesel particulate filter.
  • FIG. 1 is a schematic view of a first exemplary exhaust system for a vehicle according to the principles of the present disclosure.
  • FIG. 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 , such as an exhaust pipe or pipes, 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. In accordance with other aspects of the present disclosure, the engine 16 could be a direct injection, gasoline/lean burn 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, nitrogen monoxide, and nitrous oxide, 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. It will be appreciated that while only a portion of the passageway 12 is shown for clarity of illustration, items, systems or components positioned along passageway 12 are in fluid communication with and/or coupled to passageway 12 .
  • the diesel particulate filter 20 is operable to remove or accumulate diesel particulate matter, ash and soot from the exhaust gas 14 .
  • the diesel particulate filter 20 is operable to facilitate burning off the accumulated particulate matter. For example, the diesel particulate filter 20 may burn off accumulated soot particulates 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. However, 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.
  • 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
  • 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 .
  • the full length of the diesel particulate filter 20 can be coated with the hydrolysis coating 30 .
  • the injection port 26 is downstream of the diesel particulate filter 20 , coating only a portion of the diesel particulate filter is sufficient.
  • a forward portion of the diesel particulate filter 20 may be coated with oxidation catalyst and a rearward portion with hydrolysis catalyst, since urea spray will likely not penetrate deep into 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 112 to direct the flow of exhaust gas 114 received from an engine 116 .
  • the exhaust system 110 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 112 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 partially 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 114 .
  • 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 .

Landscapes

  • 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)
US14/301,707 2014-06-11 2014-06-11 Exhaust system for a vehicle Abandoned US20150361842A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US14/301,707 US20150361842A1 (en) 2014-06-11 2014-06-11 Exhaust system for a vehicle
PCT/US2015/035033 WO2015191672A1 (fr) 2014-06-11 2015-06-10 Système d'échappement pour véhicule

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
US20150361842A1 true US20150361842A1 (en) 2015-12-17

Family

ID=53443020

Family Applications (1)

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

Country Status (2)

Country Link
US (1) US20150361842A1 (fr)
WO (1) WO2015191672A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108999680A (zh) * 2017-06-06 2018-12-14 通用汽车环球科技运作有限责任公司 利用涡轮前还原剂喷射器的排气系统及其控制方法
CN113750948A (zh) * 2021-09-09 2021-12-07 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
WO2022173921A1 (fr) * 2021-02-12 2022-08-18 Corning Incorporated Appareil de traitement d'échappement doté d'un disque cellulaire

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080041036A1 (en) * 2006-08-16 2008-02-21 Emitec Gesellschaft Fur Emissionstechnologie Mbh Method for Adding at Least One Reactant to an Exhaust Gas Stream and Device for Treating an Exhaust Gas Stream of an Internal Combustion Engine
US20110232267A1 (en) * 2008-12-17 2011-09-29 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Method and device for the addition in droplet form of a liquid reducing agent into an exhaust gas line
US20130149207A1 (en) * 2011-12-12 2013-06-13 Johnson Matthey Public Limited Company Substrate monolith comprising scr catalyst

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10226975A1 (de) * 2002-06-17 2004-01-15 Siemens Ag Vorrichtung und Verfahren zur Reinigung von Abgas eines Dieselmotors
JP2009114930A (ja) * 2007-11-06 2009-05-28 Hino Motors Ltd 排気浄化装置
DE102008048806A1 (de) * 2008-09-24 2010-03-25 Emitec Gesellschaft Für Emissionstechnologie Mbh Abgasreinigungsanordnung und Verfahren zur Abgasreinigung mittels eines Reaktionsmittels
US20110064633A1 (en) * 2009-09-14 2011-03-17 Ford Global Technologies, Llc Multi-Functional Catalyst Block and Method of Using the Same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080041036A1 (en) * 2006-08-16 2008-02-21 Emitec Gesellschaft Fur Emissionstechnologie Mbh Method for Adding at Least One Reactant to an Exhaust Gas Stream and Device for Treating an Exhaust Gas Stream of an Internal Combustion Engine
US20110232267A1 (en) * 2008-12-17 2011-09-29 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Method and device for the addition in droplet form of a liquid reducing agent into an exhaust gas line
US20130149207A1 (en) * 2011-12-12 2013-06-13 Johnson Matthey Public Limited Company Substrate monolith comprising scr catalyst

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108999680A (zh) * 2017-06-06 2018-12-14 通用汽车环球科技运作有限责任公司 利用涡轮前还原剂喷射器的排气系统及其控制方法
WO2022173921A1 (fr) * 2021-02-12 2022-08-18 Corning Incorporated Appareil de traitement d'échappement doté d'un disque cellulaire
CN113750948A (zh) * 2021-09-09 2021-12-07 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

Also Published As

Publication number Publication date
WO2015191672A1 (fr) 2015-12-17

Similar Documents

Publication Publication Date Title
US10450925B2 (en) Exhaust gas purification apparatus for an internal combustion engine
US9057312B2 (en) System and apparatus for reducing reductant deposit formation in exhaust aftertreatment systems
US9021794B2 (en) Decomposition chamber
EP2960456B1 (fr) dispositif de traitement de gaz d'echappement compact et angulair
US9821282B2 (en) Diesel exhaust fluid mixing system for a linear arrangement of diesel oxidation catalyst and selective catalytic reduction filter
JP6433676B2 (ja) 還元剤の加熱を行う自動車用の選択触媒還元用の還元剤デリバリユニット
US9341097B2 (en) Reductant material deposit reduction in exhaust aftertreatment systems
US11060434B2 (en) Reductant injection in exhaust manifold
GB2500059A (en) Mixer for an exhaust gas after-treatment system
EP2703612A1 (fr) Épurateur de gaz d'échappement destiné à un moteur à combustion interne
US9074511B2 (en) Reductant delivery unit for SCR systems having improved deposit resistance
US20190232224A1 (en) Engine Exhaust Aftertreatment Incorporating Vanadium-Based SCR
US20150361842A1 (en) Exhaust system for a vehicle
US10113462B2 (en) Advanced exhaust aftertreatment system architecture
US11041419B2 (en) Exhaust gas post-processing system
KR20180130919A (ko) 선택적 촉매 환원 시스템
US9421496B2 (en) Exhaust gas purification apparatus for internal combustion engine
KR101283507B1 (ko) Ｓｃｒ시스템의 환원제 믹싱장치
US10082065B2 (en) Heating system for an exhaust gas treatment system
FR3028286A1 (fr) Dispositif de traitement des gaz d’echappement d’un vehicule automobile
Fadul et al. Urea mixing in selective catalytic reduction systems

Legal Events

Date Code Title Description
AS Assignment

Owner name: CHRYSLER GROUP LLC, MICHIGAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:AHARI, HOMAYOUN;ZAMMIT, MICHAEL G;CATTANI, LUI;REEL/FRAME:033077/0619

Effective date: 20140528

AS Assignment

Owner name: FCA US LLC, MICHIGAN

Free format text: CHANGE OF NAME;ASSIGNOR:CHRYSLER GROUP LLC;REEL/FRAME:035225/0202

Effective date: 20141203

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION