US20120144812A1 - Dosing module for exhaust post treatment system of vehicle - Google Patents

Dosing module for exhaust post treatment system of vehicle Download PDF

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Publication number
US20120144812A1
US20120144812A1 US13/174,075 US201113174075A US2012144812A1 US 20120144812 A1 US20120144812 A1 US 20120144812A1 US 201113174075 A US201113174075 A US 201113174075A US 2012144812 A1 US2012144812 A1 US 2012144812A1
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United States
Prior art keywords
exhaust gas
dosing
main body
treatment system
post treatment
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
US13/174,075
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English (en)
Inventor
Gisoo Hyun
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.)
Hyundai Motor Co
Kia Corp
Original Assignee
Hyundai Motor Co
Kia Motors Corp
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Filing date
Publication date
Application filed by Hyundai Motor Co, Kia Motors Corp filed Critical Hyundai Motor Co
Assigned to HYUNDAI MOTOR COMPANY, KIA MOTORS CORPORATION reassignment HYUNDAI MOTOR COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HYUN, GISOO
Publication of US20120144812A1 publication Critical patent/US20120144812A1/en
Abandoned legal-status Critical Current

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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
    • F01N3/10—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
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/21—Mixing gases with liquids by introducing liquids into gaseous media
    • B01F23/213—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids
    • B01F23/2132—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids using nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
    • B01F25/25—Mixing by jets impinging against collision plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/421—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions by moving the components in a convoluted or labyrinthine path
    • B01F25/423—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions by moving the components in a convoluted or labyrinthine path by means of elements placed in the receptacle for moving or guiding the components
    • B01F25/4231—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions by moving the components in a convoluted or labyrinthine path by means of elements placed in the receptacle for moving or guiding the components using baffles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—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
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106—Auxiliary oxidation catalysts
    • 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

  • An exemplary embodiment of the present invention relates to an exhaust system of a vehicle. More particularly, the present invention relates to a dosing module of a selective catalyst reduction (SCR) unit for exhaust gas post treatment.
  • SCR selective catalyst reduction
  • an exhaust system of an engine is provided with exhaust gas post treatment such as with a diesel oxidation catalyst (DOC), a diesel particulate filter (DPF), a selective catalyst reduction (SCR) unit, etc., so as to reduce diesel particulate matter (PM) and nitrogen oxide (NO x ).
  • DOC diesel oxidation catalyst
  • DPF diesel particulate filter
  • SCR selective catalyst reduction
  • a reducing agent for example, a urea solution
  • the reducing agent (urea) is hydrolyzed to ammonia (NH 3 ) by the heat of the exhaust gas, and nitrogen oxide (NO x ) of the exhaust gas reacts with the ammonia (NH 3 ) through a catalyst of the SCR unit to be transformed into nitrogen (N 2 ) gas and water (H 2 O).
  • the DOC and the DPF are disposed in a flowing direction of the exhaust gas, and the SCR unit is disposed at a downstream side of the DPF. Further, a dosing module having an injector is disposed between the DPF and the SCR unit to inject the reducing agent.
  • the injection speed of the reducing agent is increased by raising the injection pressure according to EM (emission) standards.
  • the spray depth of the reducing agent from the injector is increased in the conventional art such that the injected reducing agent is accumulated on the interior wall of the exhaust gas line, i.e., there is a problem that a wall wetting phenomenon is generated.
  • the wall wetting phenomenon of the reducing agent that is injected is a cause of deterioration of purification efficiency of nitrogen oxide and activation of the SCR, and in a case that the liquid element of the reducing agent evaporates on the interior wall of the exhaust gas line, a solid residue thereof remains, and resultantly it becomes difficult to control the injection amount.
  • a mixer is disposed in the exhaust gas line so as to mix the reducing agent that is injected by the injector with the exhaust gas and so as to prevent the wall wetting.
  • the injector is disposed at a curved pipe portion of the exhaust gas line so as to prevent the wall wetting phenomenon such that the reducing agent is injected into the exhaust gas passing the curved pipe portion.
  • the injector since the injector is disposed at the curved portion of the exhaust gas line, it is necessary to secure appropriate positioning such that the reducing agent may be hydrolyzed to ammonia (NH 3 ) by the heat of the exhaust gas. Accordingly, it is necessary to secure the shape of the exhaust pipe to provide the appropriate positioning, the entire post treatment layout becomes complicated thereby, and there is a problem that it is difficult to dispose the injector on the layout.
  • NH 3 ammonia
  • Various aspects of the present invention are directed to providing a dosing module for an exhaust gas post treatment system of a vehicle having advantages of substantially preventing a wall wetting phenomenon of a reducing agent and improving efficiency of a selective catalyst reduction (SCR) unit without injecting the reducing agent into a curved pipe and without disposing a mixer in the exhaust pipe.
  • SCR selective catalyst reduction
  • a dosing module for an exhaust gas post treatment system of a vehicle which may be used to inject a reducing agent along a flow direction of exhaust gas at a front side of a selective catalyst reduction (SCR) unit, may include a dosing main body having a connection portion that may be connected to the SCR unit and an inflow portion into which the exhaust gas flows, an injector that may be disposed at a boss portion that may be mounted on the dosing main body to inject the reducing agent into the dosing main body, and a guide member that may be disposed inside the dosing main body to guide the exhaust gas flowing into the dosing main body along a predetermined route.
  • SCR selective catalyst reduction
  • the guide member may have a plate shape to separate the connection portion from the inflow portion in the dosing main body.
  • One end of the guide member may be fixed to an inside wall of the dosing main body and the other end thereof may be bent from the inside wall to may have a curved shape, wherein the curved shape may be bent toward the injector with a predetermined curvature to enclose the inflow portion therein.
  • the guide member may have a plurality of holes, wherein a baffle member may be mounted in the dosing main body to be engaged with the guide member and an inside wall of the dosing main body to form the inflow portion.
  • the baffle member may have a plate shape except at the inflow portion in the dosing main body, wherein the baffle member forms a flow passage between the guide member and an inside wall of the dosing main body.
  • the baffle member may be disposed on a slant toward the inflow portion in the dosing main body.
  • the injector may be disposed on a slant along the flow direction of the exhaust gas on the boss member, wherein the injector injects the reducing agent toward the curved portion of the guide member.
  • the connecting portion forms a connecting passage that may be connected to the SCR unit at a lower portion of the dosing main body.
  • the dosing module for an exhaust gas post treatment system of a vehicle prevents the wall wetting phenomenon in an exemplary embodiment of the present invention without injecting the reducing agent to the curved pipe and without disposing the mixer in the exhaust pipe, and the mixture of the exhaust gas and the reducing agent and the uniformity and the reaction activity thereof are improve regardless of the layout of the vehicle such that the efficiency of the SCR unit is increased.
  • FIG. 1 is a schematic block diagram showing an exhaust gas post treatment system of a vehicle according to an exemplary embodiment of the present invention.
  • FIG. 2 is an exploded perspective view showing a dosing module for an exhaust gas post treatment system of a vehicle according to an exemplary embodiment of the present invention.
  • FIG. 3 is a schematic diagram of an assembled front view of FIG. 2 .
  • FIG. 4A and FIG. 4B show operational states of a dosing module for an exhaust gas post treatment system of a vehicle according to an exemplary embodiment of the present invention.
  • FIG. 1 is a schematic block diagram showing an exhaust gas post treatment system of a vehicle according to an exemplary embodiment of the present invention.
  • an exemplary embodiment of the present invention can be applied to an exhaust gas post treatment system 200 that purifies exhaust gas generated from a diesel engine for a commercial vehicle.
  • the exhaust gas post treatment system 200 for example, includes a diesel oxidation catalyst (DOC) 1 that is disposed on the exhaust line, a diesel particulate filter (DPF) 3 that is disposed at a downstream side of the DOC 1 , and a selective catalyst reduction (SCR) unit 5 that is disposed at a downstream side of the DPF 3 .
  • DOC diesel oxidation catalyst
  • DPF diesel particulate filter
  • SCR selective catalyst reduction
  • the DOC 1 oxidizes all hydrocarbons and carbon monoxide of the exhaust gas and oxidizes nitrogen monoxide to nitrogen dioxide.
  • the DPF 3 includes a catalyst support for trapping particulate matter (PM) included in the exhaust gas, and the catalyst support eliminates the PM through a chemical reaction.
  • PM particulate matter
  • the SCR unit 5 chemically reduces nitrogen oxide passing the DOC 1 and the DPF 3 to N 2 gas by using a reducing agent such as a urea solution.
  • the reducing agent is transformed to ammonia by the oxidation heat, and the nitrogen oxide reacts with the ammonia through the catalyst of the SCR 5 to be transformed into N 2 gas and water.
  • the exhaust gas post treatment system 200 includes a dosing module 100 that is disposed between the DPF 3 and the SCR 5 according to the present exemplary embodiment, which is used to inject the reducing agent along a flowing direction of the exhaust gas.
  • the dosing module 100 is not limited by a layout of a vehicle, and it enhances mixing of the exhaust gas and the reducing agent and improves efficiency of the SCR unit 5 by reaction activation and improved uniformity.
  • FIG. 2 is an exploded perspective view showing a dosing module for an exhaust gas post treatment system of a vehicle according to an exemplary embodiment of the present invention
  • FIG. 3 is a schematic diagram of an assembled front view of FIG. 2 .
  • the dosing module 100 for an exhaust gas post treatment system of a vehicle basically includes a dosing main body 10 , an injector 30 , a guide member 50 , and a baffle member 70 , and these are described as follows.
  • the dosing main body 10 can connects the DPF 3 and the SCR unit 5 of the exhaust gas post treatment system 200 in the present exemplary embodiment.
  • One side of the dosing main body 10 is closed and the other side thereof is opened to have a cylinder shape, and the dosing main body 10 has an inflow portion 11 into which the exhaust gas flows and a connecting portion 13 that is connected to the SCR unit 5 .
  • the inflow portion 11 is an inlet into which the exhaust gas flows, and can be formed in another side of the dosing main body 10 through the guide member 50 that is to be described hereafter and the baffle member 70 .
  • the connecting portion 13 is connected to the SCR unit 5 through a pipe to form a connecting passage 12 that is connected to the SCR unit 5 .
  • the connecting passage 12 has a narrower cross-section than that of the dosing main body 10 , and can be formed at a lower side of the dosing main body 10 .
  • the injector 30 that is to be described hereafter is disposed at a boss member of an upper side of the dosing main body 10 .
  • An opening is formed to be connected to an interior space of the dosing main body 10 , and the boss member 15 is disposed around the opening to be welded on the exterior circumference of the dosing main body 10 .
  • the boss member 15 is biased from the upper center of the exterior circumference of the dosing main body 10 in one direction by a predetermined distance, and a mounting bracket 17 for mounting the injector 30 is disposed on the boss member 15 .
  • the injector 30 is used to inject the reducing agent into the dosing main body 10 , and is mounted on the opening of the boss member 15 through the mounting bracket 17 .
  • the injector 30 is mounted at the boss member on a slant along the flowing direction of the exhaust gas.
  • the injector 30 is a secondary injection device of a conventional art that is used in an exhaust system of this field, and a detailed description thereof will be omitted in this specification.
  • the guide member 50 guides the exhaust gas flowing into the dosing main body 10 through the inflow portion 11 along a predetermined line in the present exemplary embodiment.
  • the guide member 50 promotes mixing of the reducing agent injected by the injector 30 with the exhaust gas and atomizing of the reducing agent to improve mixture uniformity of the exhaust gas and the reducing agent.
  • the guide member 50 is disposed inside the dosing main body 10 to have a plate shape that separates the inflow portion 11 from the connecting portion 13 in the dosing main body 10 .
  • the guide member 50 is welded on the interior wall of the dosing main body 10 , wherein one end thereof is fixed on the interior wall corresponding to the inflow portion 11 and the other end thereof is extended from the fixed portion.
  • the other end portion of the guide member 50 is bent to have a semi-circular shape, and one end portion thereof has a softly curved shape to be fixed on the interior wall of the dosing main body 10 .
  • a round portion 51 of the other end portion of the guide member 50 generates a strong turning flow in the exhaust gas flowing into the dosing main body 10 to improve the mixture uniformity of the exhaust gas and the reducing agent.
  • a plurality of holes 53 are formed on all areas of the guide member 50 and the holes 53 promotes mixing of the exhaust gas and the reducing agent, wherein the reducing agent is injected by the injector 30 and the exhaust gas is guided by the guide member 50 .
  • the injector 30 is biased toward one side direction from the upper center of the dosing main body 10 by the boss member 15 that is described above such that the injector 30 injects the reducing agent toward the round portion 51 of the guide member 50 .
  • the reducing agent of the injector 30 since the reducing agent of the injector 30 is injected toward the round portion 51 of the guide member 50 in which the holes 53 are formed, the reducing agent does not collide with the interior wall of the dosing main body 10 at an early injection stage.
  • the baffle member 70 forms the inflow portion 11 into which the exhaust gas flows, induces the exhaust gas to the inflow portion 11 , and improves the straightness of the reducing agent by preventing axial movement of the exhaust gas in the present exemplary embodiment.
  • the baffle member 70 is fixed on the interior wall and the guide member 50 to have a plate shape covering a part except the inflow portion 11 in the dosing main body 10 .
  • the baffle member 70 contacts the guide member 50 to be fixed on the interior wall of the dosing main body 10 , and the inflow portion 11 corresponding to the shape of the guide member 50 is formed.
  • the baffle member 70 covers between the guide member 50 and the dosing main body 10 except at the inflow portion 11 to form a flow passage 71 of the exhaust gas, and an inlet of the exhaust gas is formed by the inner side of the guide member 50 and the interior wall of the dosing main body 10 .
  • baffle member 70 it is desirable for the baffle member 70 to be slanted toward the inflow portion 11 on the interior surface of the dosing main body 10 so as to induce the exhaust gas toward the inflow portion 11 .
  • the exhaust gas that has passed the DOC 1 and the DPF 3 is induced to the inflow portion 11 by the baffle member 70 of the dosing main body 10 to flow through the inflow portion 11 .
  • the exhaust gas collides with the round portion 51 of the guide member 50 to form a strong turning flow and flows through the flow passage 71 between the guide member 50 and the dosing main body 10 .
  • the injector 30 injects the reducing agent and is disposed on the slant toward one side direction from the upper center of the dosing main body 10 such that the reducing agent is injected toward the round portion 51 of the member 50 .
  • the baffle member 70 prevents axial direction flowing of the exhaust gas to improve the straightness of the reducing agent that is injected from the injector 30 .
  • the reducing agent that is injected from the injector 30 is injected toward the round portion 51 of the guide member 50 where the holes 53 are formed in the present exemplary embodiment, the reducing agent is prevented from being attached to the interior wall of the dosing main body 10 at an early stage thereof.
  • the reducing agent injected by the injector 30 collides with the guide member 50 of a high temperature in the present exemplary embodiment and the atomization thereof is improved thereby, and the mixing time of the exhaust gas and the reducing agent is secured.
  • the reducing agent collides with the exhaust gas flowing through the holes 53 of the guide member 50 to be mixed therewith and the atomization thereof is promoted.
  • the reducing agent is uniformly mixed by the strong turning flow of the exhaust gas that is formed by the flow passage 71 .
  • the reducing agent is transformed to ammonia (NH 3 ) by the heat of the exhaust gas in the dosing main body 10 in the present exemplary embodiment, and the NH 3 flows into the SCR unit ( 5 of FIG. 1 ) through the connecting portion 13 to react with nitrogen oxide in all areas of the SCR 5 by an venturi effect.
  • a dosing module 100 for an exhaust gas post treatment system of a vehicle prevents the wall wetting phenomenon in an exemplary embodiment of the present invention without injecting the reducing agent into a curved pipe and without disposing the mixer in the exhaust pipe.
  • the mixture of the exhaust gas and the reducing agent and the uniformity and the reaction activity thereof are improved regardless of the layout of the vehicle in the present exemplary embodiment such that the efficiency of the SCR unit 5 is increased.
US13/174,075 2010-12-09 2011-06-30 Dosing module for exhaust post treatment system of vehicle Abandoned US20120144812A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2010-0125531 2010-12-09
KR1020100125531A KR101251518B1 (ko) 2010-12-09 2010-12-09 차량의 배기가스 후처리 시스템용 도징 모듈

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JP (1) JP5779410B2 (ja)
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DE (1) DE102011051875B4 (ja)

Cited By (25)

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EP2823880A1 (en) * 2013-07-08 2015-01-14 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification appratus for an internal combustion engine
US20150020484A1 (en) * 2012-01-12 2015-01-22 Hino Motors, Ltd. Exhaust gas purification device
CN104487666A (zh) * 2012-07-25 2015-04-01 日野自动车株式会社 排气净化装置
EP2865861A1 (de) * 2013-10-22 2015-04-29 Eberspächer Exhaust Technology GmbH & Co. KG Kataylsatoranordnung mit Injektionsabschnitt
CN104594990A (zh) * 2015-02-27 2015-05-06 天纳克（苏州）排放系统有限公司 混合管及其排气处理装置
US9267417B2 (en) 2013-10-31 2016-02-23 Faurecia Emissions Control Technologies Usa, Llc Diffuser plate
US20160194994A1 (en) * 2013-08-13 2016-07-07 Emitec Gesellschaft Fur Emissionstechnologie Mbh Exhaust gas treatment unit comprising flow dividing and mixing guide elements
CN105822400A (zh) * 2015-01-26 2016-08-03 卡特彼勒公司 流搅拌器
CN106401711A (zh) * 2016-10-25 2017-02-15 无锡威孚力达催化净化器有限责任公司 蜂窝半球开口式尿素混合装置
US9932870B2 (en) 2014-10-07 2018-04-03 Daimler Ag Exhaust gas aftertreatment device for a combustion engine, in particular of a motor vehicle
WO2018156146A1 (en) * 2017-02-24 2018-08-30 Faurecia Emissions Control Technologies, Usa, Llc Injector spray protector
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US10316721B1 (en) 2018-04-23 2019-06-11 Faurecia Emissions Control Technologies, Usa, Llc High efficiency mixer for vehicle exhaust system
US10287948B1 (en) 2018-04-23 2019-05-14 Faurecia Emissions Control Technologies, Usa, Llc High efficiency mixer for vehicle exhaust system
WO2020216520A1 (de) * 2019-04-25 2020-10-29 Robert Bosch Gmbh Mischervorrichtung für ein abgasnachbehandlungssystem eines kraftfahrzeugs, abgasnachbehandlungssystem und kraftfahrzeug
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US10767537B1 (en) * 2019-06-28 2020-09-08 GM Global Technology Operations LLC Hydrocarbon injector deflector assembly for diesel exhaust system
CN110848005A (zh) * 2019-11-26 2020-02-28 无锡亿利环保科技有限公司 发动机尾气后处理混合装置
JP2021107703A (ja) * 2019-12-27 2021-07-29 フタバ産業株式会社 排気ガス浄化装置及び旋回流発生部材
JP7152385B2 (ja) 2019-12-27 2022-10-12 フタバ産業株式会社 排気ガス浄化装置及び旋回流発生部材
FR3111945A1 (fr) * 2020-06-25 2021-12-31 Faurecia Systemes D'echappement Mélangeur de réducteur pour gaz d’échappement
US11428140B1 (en) * 2021-03-31 2022-08-30 Faurecia Emissions Control Technologies, Usa, Llc Mixer assembly for vehicle exhaust system
US11549422B1 (en) 2021-12-06 2023-01-10 Tenneco Automotive Operating Company Inc. Exhaust system for a combustion engine including a flow distributor

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DE102011051875A1 (de) 2012-06-14

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