US20110131958A1 - System and method for mitigating potential for formation of urea deposits in an engine exhaust system during cold ambient conditions - Google Patents

System and method for mitigating potential for formation of urea deposits in an engine exhaust system during cold ambient conditions Download PDF

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Publication number
US20110131958A1
US20110131958A1 US12/631,228 US63122809A US2011131958A1 US 20110131958 A1 US20110131958 A1 US 20110131958A1 US 63122809 A US63122809 A US 63122809A US 2011131958 A1 US2011131958 A1 US 2011131958A1
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United States
Prior art keywords
exhaust gas
exhaust system
set forth
engine
electric heater
Prior art date
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Abandoned
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US12/631,228
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English (en)
Inventor
Brad J. Adelman
Vadim Strots
Shyam Santhanam
Edward M. Derybowski
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International Engine Intellectual Property Co LLC
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International Engine Intellectual Property Co 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 International Engine Intellectual Property Co LLC filed Critical International Engine Intellectual Property Co LLC
Priority to US12/631,228 priority Critical patent/US20110131958A1/en
Assigned to INTERNATIONAL ENGINE INTELLECTUAL PROPERTY COMPANY, LLC reassignment INTERNATIONAL ENGINE INTELLECTUAL PROPERTY COMPANY, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ADELMAN, BRAD J., SANTHANAM, SHYAM, STROTS, VADIM, DERYBOWSKI, EDWARD M.
Priority to EP10835164A priority patent/EP2507487A1/en
Priority to PCT/US2010/058824 priority patent/WO2011069030A1/en
Priority to ARP100104479A priority patent/AR079262A1/es
Priority to CN2010800546449A priority patent/CN102639828A/zh
Priority to AU2010325892A priority patent/AU2010325892A1/en
Priority to BR112012013486A priority patent/BR112012013486A2/pt
Publication of US20110131958A1 publication Critical patent/US20110131958A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
    • 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
    • F01N2240/20—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 flow director or deflector
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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

  • This disclosure relates to internal combustion engines, especially diesel engines like those used to propel large trucks, and in particular the disclosure relates to engine exhaust after-treatment that comprises injecting urea solution into the engine exhaust system for promoting selective catalytic reduction (SCR) of certain constituents of engine exhaust.
  • SCR selective catalytic reduction
  • An example of a diesel engine exhaust after-treatment system that uses selective catalytic reduction (SCR) comprises an injector through which aqueous urea solution is injected into the exhaust flow. Ideally the solution should completely vaporize and thoroughly mix with the exhaust gas before the flow passes across catalytic surfaces.
  • SCR selective catalytic reduction
  • the geometry of an exhaust after-treatment system and the spray pattern of a urea injector may cause some of the injected solution to wet interior surfaces of the exhaust system before it vaporizes. When the temperature of those surfaces is low enough, a potential exists for urea to come out of solution and form deposits on those surfaces. Accumulations of solid deposits may, over time, impair the effectiveness of the after-treatment system, such as by altering flow characteristics of the exhaust and/or the spray pattern of the urea injector, and/or they may damage exhaust and after-treatment system components.
  • Urea can potentially deposit even on the tip of the injector, and if it does so, spray quality and uniformity may be adversely affected, potentially leading to lower NOx conversion efficiency by selective catalytic reduction. Removal of significant urea deposits typically requires disassembly of components because of lack of acceptable ways to satisfactorily remove them without such disassembly.
  • the injection of urea may be temporarily delayed when a cold engine is first started, especially during cold ambient conditions. That however delays the onset of exhaust gas treatment by selective catalytic reduction.
  • the present disclosure provides a system and method for mitigating the potential for formation of urea deposits in an engine exhaust system, especially during cold ambient conditions, e.g. below the freezing point of typical urea solution, approximately ⁇ 10° C.
  • One or more electric heater elements are associated with certain surfaces of the exhaust system. They are effective to heat those surfaces when the potential for formation of urea deposits on those surfaces is indicated.
  • the surfaces include the urea injection boss, the exhaust system wall both upstream and downstream of the boss, and structure within that wall, such as a grid for breaking up spray droplets and a mixer for mixing the entrained fluids.
  • Electric heating may occur when exhaust gas temperature, as measured by a sensor centrally located upstream of the point of injection, is lower than a selected temperature (200° C. being a typical example) below which urea injection is disallowed. The heating is continued until the measured exhaust gas temperature is high enough to reasonably assure that temperature of the surfaces being heated will be kept above some minimum above which urea deposits are unlikely to form.
  • the power requirement of the heater element or elements is based on maintaining a minimum temperature of at least about 150° C. to about 200° C. (please explain last sentence)
  • the heater element or elements can be integrated with the wall of the exhaust system, specifically to heat surfaces in the direct path of the urea spray and surfaces that might have too low a temperature both prior to and during the urea injection in the absence of electric heating.
  • the heater can also be activated for a short time during warmer conditions, for instance if a large urea injection is performed in order to more quickly charge the SCR catalyst.
  • the disclosed system and method can mitigate the potential for urea deposit formation and/or decrease the amount of time for which urea injection is disallowed when a cold engine is first started.
  • a general aspect of the disclosure relates to an internal combustion engine comprising an exhaust system through which exhaust gas created by combustion in engine combustion chambers passes to atmosphere and which comprises an after-treatment device for treating the exhaust gas before the exhaust gas leaves the exhaust system, an injector for injecting a liquid phase reductant for the after-treatment device's treatment of the exhaust gas into the exhaust system upstream of the after-treatment device for entrainment with, and vaporization in, flow of the exhaust gas through the exhaust system, and one or more electric heater elements for heating a surface that may be wetted by the liquid phase to a temperature that is high enough to prevent reductant from coming out of the liquid phase and depositing on the surface.
  • Still another general aspect relates to a method for mitigating the deposit of reductant out of liquid phase on a surface of an internal combustion engine exhaust system through which exhaust gas created by combustion in engine combustion chambers passes to atmosphere and which comprises an after-treatment device for treating the exhaust gas before the exhaust gas leaves the exhaust system, and an injector for injecting liquid phase reductant for the after-treatment device's treatment of the exhaust gas into the exhaust system upstream of the after-treatment device for entrainment with, and vaporization in, flow of the exhaust gas through the exhaust system.
  • the method comprises operating one or more electric heater elements to heat a surface that may be wetted by the liquid phase to a temperature that is high enough to prevent reductant from coming out of the liquid phase and depositing on the surface.
  • FIG. 1 is a general schematic diagram of an engine and its exhaust system, including after-treatment.
  • FIG. 2 is a schematic diagram of a urea spray pattern in the exhaust system.
  • FIG. 1 shows an example of a turbocharged diesel engine 10 having an intake system 12 through which charge air enters and an exhaust system 14 through which exhaust gas resulting from combustion exits, not all details of those two systems that are typically present being shown.
  • Engine 10 comprises a number of cylinders 16 forming combustion chambers into which fuel is injected by fuel injectors to combust with the charge air that has entered through intake system 12 .
  • Energy released by combustion powers the engine via pistons connected to a crankshaft.
  • engine 10 When used in a motor vehicle, such as a truck, engine 10 is coupled through a drivetrain to driven wheels that propel the vehicle. Intake valves control the admission of charge air into cylinders 16 , and exhaust valves control the outflow of exhaust gas through exhaust system 14 and ultimately to atmosphere. Before entering the atmosphere however, the exhaust gas is treated by one or more after-treatment devices in an after-treatment system 18 .
  • After-treatment system 18 comprises a walled housing 20 circumscribing an exhaust flow path and having an exhaust gas inlet 22 through which exhaust gas from cylinder 16 enters for passage through the housing.
  • the interior of housing contains, in succession along the exhaust flow path from inlet 22 , a diesel particulate filter (DPF) element 24 , a perforate impingement plate, or mesh 26 , and a mixer 28 .
  • DPF diesel particulate filter
  • a urea injector 30 is mounted in a boss 32 in the housing wall for spraying aqueous urea solution as a liquid phase reductant from a nozzle 34 into the exhaust gas flowing through the housing.
  • Flow that has passed through mixer 28 is conveyed to pass across catalytic surfaces of an SCR catalyst 36 where catalytic reduction of NOx by the reductant occurs before the flow exits the exhaust system through a tailpipe.
  • a supply of aqueous urea solution is stored in a tank 38 .
  • a representative urea solution has approximately a 32.5% concentration by weight.
  • controller 40 that is associated with the supply in tank 38 and with injector 30 .
  • a control input to controller 40 is a measurement of exhaust gas temperature obtained from a temperature sensor 42 that is disposed to measure temperature of exhaust gas upstream of the injector at a generally central location of the flow.
  • Injector nozzle 34 lies substantially on an imaginary centerline aimed downstream of the flow, but at an acute angle to the prevailing axial flow coming from filter element 24 .
  • Injector 30 injects urea solution as a spray having a representative pattern 44 shown in FIG. 2 .
  • Plate, or mesh, 26 is disposed in the spray path and intended to promote rapid vaporization of droplets in the urea solution spray by deflecting/dispersing/breaking up the droplets.
  • Mixer 28 is intended to promote thorough mixing of the vapor with the exhaust gas flow before it arrives at SCR 36 .
  • SCR catalyst 40 promotes the reaction of exhaust gas constituents with the decomposition products of urea solution vaporization.
  • One or more electric heater elements are associated with certain surfaces of the exhaust system.
  • the heater elements are intended to heat those surfaces when the potential for formation of urea deposits on those surfaces is indicated.
  • the surfaces include boss 32 , the wall of housing 20 both upstream and downstream of boss 32 , plate, or mesh 26 , and mixer 28 .
  • a representative use of heater elements 46 occurs when exhaust gas temperature, as measured by sensor 42 , is lower than a selected temperature below which controller 40 disallows urea injection because of concern that deposits could form on surfaces wetted by the liquid phase reductant.
  • the heater elements are activated, with heating being continued until the measured exhaust gas temperature is high enough to reasonably assure that temperature of the surfaces being heated will be kept above some minimum above which urea deposits are unlikely to form.
  • the heater elements can be integrated with the housing wall and boss, specifically to heat surfaces in the direct path of the urea spray and surfaces that might have too low a temperature both prior to and during the urea injection in the absence of electric heating.
  • a heater element in the boss can have a high enough rating to cause heat to flow through the boss and into the injector through which liquid passes.
  • the heater can also be activated for a short time during warmer conditions, for instance if a large urea injection is performed in order to more quickly charge the SCR catalyst.
  • the disclosed system and method can mitigate the potential for urea deposit formation and/or decrease the amount of time for which urea injection is disallowed when a cold engine is first started.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
US12/631,228 2009-12-04 2009-12-04 System and method for mitigating potential for formation of urea deposits in an engine exhaust system during cold ambient conditions Abandoned US20110131958A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US12/631,228 US20110131958A1 (en) 2009-12-04 2009-12-04 System and method for mitigating potential for formation of urea deposits in an engine exhaust system during cold ambient conditions
EP10835164A EP2507487A1 (en) 2009-12-04 2010-12-03 Mitigating potential for urea deposit formation in engine exhaust
PCT/US2010/058824 WO2011069030A1 (en) 2009-12-04 2010-12-03 Mitigating potential for urea deposit formation in engine exhaust
ARP100104479A AR079262A1 (es) 2009-12-04 2010-12-03 Sistema y metodo para mitigar el potencial para la formacion de depositos de urea en un sistema de escape a motor durante condiciones ambientales frias
CN2010800546449A CN102639828A (zh) 2009-12-04 2010-12-03 降低发动机排气中形成尿素沉积物的可能性
AU2010325892A AU2010325892A1 (en) 2009-12-04 2010-12-03 Mitigating potential for urea deposit formation in engine exhaust
BR112012013486A BR112012013486A2 (pt) 2009-12-04 2010-12-03 atenuação de potencial para formação de depósito de ureia em descarga de motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12/631,228 US20110131958A1 (en) 2009-12-04 2009-12-04 System and method for mitigating potential for formation of urea deposits in an engine exhaust system during cold ambient conditions

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US20110131958A1 true US20110131958A1 (en) 2011-06-09

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US (1) US20110131958A1 (zh)
EP (1) EP2507487A1 (zh)
CN (1) CN102639828A (zh)
AR (1) AR079262A1 (zh)
AU (1) AU2010325892A1 (zh)
BR (1) BR112012013486A2 (zh)
WO (1) WO2011069030A1 (zh)

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WO2013127955A1 (de) * 2012-03-02 2013-09-06 Emitec Gesellschaft Für Emissionstechnologie Mbh Vorrichtung zur abgasreinigung
CN103821595A (zh) * 2012-11-16 2014-05-28 大陆汽车系统公司 用于scr系统的具有改善的沉积抵抗的还原剂输送单元
US8822887B2 (en) 2010-10-27 2014-09-02 Shaw Arrow Development, LLC Multi-mode heater for a diesel emission fluid tank
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USD729141S1 (en) 2014-05-28 2015-05-12 Shaw Development LLC Diesel emissions fluid tank
USD729722S1 (en) 2014-05-28 2015-05-19 Shaw Development LLC Diesel emissions fluid tank floor
US9091189B2 (en) 2012-07-13 2015-07-28 Cummins Ip, Inc. Method and system for mitigating urea deposits within an SCR catalyst system
US9581067B2 (en) 2012-09-28 2017-02-28 Faurecia Emissions Control Technologies, Usa, Llc Exhaust system mixer with impactor
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US20180306081A1 (en) * 2015-10-30 2018-10-25 Continental Automotive Gmbh Fluid Injection System
CN108729990A (zh) * 2017-04-20 2018-11-02 北华航天工业学院 一种防尿素结晶的柴油机后处理加热混合装置
US10287948B1 (en) 2018-04-23 2019-05-14 Faurecia Emissions Control Technologies, Usa, Llc High efficiency mixer for vehicle exhaust system
US10316721B1 (en) 2018-04-23 2019-06-11 Faurecia Emissions Control Technologies, Usa, Llc High efficiency mixer for vehicle exhaust system
US10337380B2 (en) 2017-07-07 2019-07-02 Faurecia Emissions Control Technologies, Usa, Llc Mixer for a vehicle exhaust system
US10493410B2 (en) 2015-01-09 2019-12-03 Cummins Emission Solutions Inc. Selective catalytic reduction with integrated decomposition chamber with exhaust flow swirl generating design
US10577995B2 (en) 2017-08-25 2020-03-03 Faurecia Emissions Control Technologies, Usa, Llc Double wall mixer with active heat transfer
US10787946B2 (en) 2018-09-19 2020-09-29 Faurecia Emissions Control Technologies, Usa, Llc Heated dosing mixer
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US11181027B2 (en) 2018-04-02 2021-11-23 Cummins Emission Solutions Inc. Aftertreatment system including noise reducing components
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US8822887B2 (en) 2010-10-27 2014-09-02 Shaw Arrow Development, LLC Multi-mode heater for a diesel emission fluid tank
CN104160124A (zh) * 2012-03-02 2014-11-19 排放技术有限公司 用于排气净化的设备
WO2013127955A1 (de) * 2012-03-02 2013-09-06 Emitec Gesellschaft Für Emissionstechnologie Mbh Vorrichtung zur abgasreinigung
US9617895B2 (en) 2012-03-02 2017-04-11 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Device for exhaust-gas purification and motor vehicle having the device
US10391450B2 (en) 2012-07-13 2019-08-27 Cummins Ip, Inc. Method and system for mitigating urea deposits within an SCR catalyst system
US9718027B2 (en) 2012-07-13 2017-08-01 Cummins Ip, Inc. Method and system for mitigating urea deposits within an SCR catalyst system
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WO2011069030A1 (en) 2011-06-09
AU2010325892A1 (en) 2012-06-21
AR079262A1 (es) 2012-01-04
CN102639828A (zh) 2012-08-15
EP2507487A1 (en) 2012-10-10

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