WO2012000582A1 - Système d'addition d'agent de réduction - Google Patents

Système d'addition d'agent de réduction Download PDF

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Publication number
WO2012000582A1
WO2012000582A1 PCT/EP2011/002316 EP2011002316W WO2012000582A1 WO 2012000582 A1 WO2012000582 A1 WO 2012000582A1 EP 2011002316 W EP2011002316 W EP 2011002316W WO 2012000582 A1 WO2012000582 A1 WO 2012000582A1
Authority
WO
WIPO (PCT)
Prior art keywords
inner tube
tube
exhaust gas
reducing agent
injector
Prior art date
Application number
PCT/EP2011/002316
Other languages
German (de)
English (en)
Inventor
Antonio Pepe
Original Assignee
Daimler Ag
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 Daimler Ag filed Critical Daimler Ag
Publication of WO2012000582A1 publication Critical patent/WO2012000582A1/fr

Links

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]
    • 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
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
    • B01F25/3141—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit with additional mixing means other than injector mixers
    • 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
    • B01F25/30—Injector mixers
    • B01F25/32—Injector mixers wherein the additional components are added in a by-pass of the main flow
    • 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
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • 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
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • 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
    • F01N13/14—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 thermal insulation
    • F01N13/141—Double-walled exhaust pipes or housings
    • 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
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled
    • 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
    • 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 invention relates to an exhaust gas system for a motor vehicle, in particular for a passenger car, with at least one tube which surrounds an inner tube, which can be bypassed by exhaust gas and flowed through by exhaust gas in the axial direction. Furthermore, an injector is provided, by means of which a reduction agent suitable for reducing nitrogen oxides to nitrogen reducing agent in the inner tube can be introduced.
  • SCR Selective Catalytic Reduction
  • an aqueous urea solution is introduced into an exhaust gas system of the motor vehicle.
  • the solution is not injected directly into the exhaust line in front of the SCR catalyst, but a little way in front of the catalyst, for example about 60 cm upstream of the same.
  • a pipe section of the exhaust line from the injection to the SCR catalyst is referred to as a mixing section. In this mixing section, the evaporation of the aqueous urea solution takes place, and from the urea, ammonia is released, which is then available in the SCR catalyst for the selective catalytic reduction of nitrogen oxides to nitrogen available.
  • DE 10 2004 020 138 A1 describes a reducing agent addition system for a commercial vehicle, in which a first pipe is connected to a second pipe via a corrugated hose. Within the corrugated hose, an inner tube is arranged, which can be flowed through by exhaust gas both in the axial direction and by the exhaust gas on the outside. An injector passes through the first tube, and an exit nozzle of the injector is angled so that the aqueous urea solution exits the nozzle in the axial direction during operation of the injector.
  • Object of the present invention is to provide an exhaust system of the type mentioned, which is designed to save space and allows a particularly good mixing of the reducing agent with exhaust gas.
  • the exhaust gas line according to the invention which can be used in particular in a passenger car, comprises at least one tube which surrounds an inner tube which can be flowed around by exhaust gas and can be flowed through by exhaust gas in the axial direction.
  • An injector for introducing a reducing agent suitable for reducing nitrogen oxides to nitrogen in the inner tube opens into the inner tube obliquely to the axial direction of the inner tube. Due to the obliquely with respect to the inner tube arrangement of the injector space requirements of the injector is particularly low, and the exhaust system can be designed to save space. Due to the fact that the reducing agent enters the inner tube obliquely to the axial main direction of the exhaust gas flowing through the inner tube, a particularly good mixing of the reducing agent with the exhaust gas is also achievable.
  • the inner tube is also surrounded on the outer peripheral side of exhaust gas.
  • the inner tube has a particularly high surface temperature, and the reducing agent introduced into the inner tube by means of the injector is vaporized particularly quickly.
  • the rapid evaporation of the reducing agent also allows a rapid processing of the reducing agent, such as when using an aqueous urea solution, a release of ammonia from the urea, and a particularly uniform distribution of the reducing agent in the exhaust gas.
  • the reducing agent injected directly into the inner tube is entrained by the partial flow of the exhaust gas which flows in the axial direction through the inner tube. After flowing through the inner tube, the exhaust gas acted upon by the reducing agent is mixed with the partial flow of the exhaust gas which has flowed past the inner tube on the outer peripheral side.
  • the inner tube is arranged in the region of a decoupling element, by means of which a first tube is connected to a second pipe of the exhaust gas line.
  • the inner tube shields the decoupling of the in the reducing gas introduced from the exhaust line, so that it can not come to a deposition of ingredients of the reducing agent on the decoupling.
  • the reduction of vibrations also contributes to the fact that the exhaust line has a particularly high durability, since it leads to a lower
  • Ingredients of the reducing agent can come to the decoupling element.
  • the injector can open into the inner tube upstream of the decoupling element or in the region of the decoupling element, since it is ensured by the inner tube that no reducing agent comes into contact with the inner tube.
  • An exhaust system 10 of a passenger car comprises a first tube 12, which is connected by means of a corrugated tube 14 with a second tube 16.
  • the corrugated tube 14 serves as a decoupling element, since it reduces a transmission of vibrations from the first tube 12 to the second tube 16.
  • the tubes 12, 16 and the corrugated tube 14 surround an inner tube 18, which is connected via holders 20 fixed to the first tube 12.
  • An injector 22 opens obliquely into the inner tube 18, so that a urea solution 24 emerging from the injector 22 enters the inner tube 18 transversely to the axial flow direction of the exhaust gas through the inner tube 18.
  • the exhaust gas flowing through the inner pipe 18 is illustrated by flow arrows 26 which simultaneously indicate the axial direction of the inner pipe 18.
  • the inner pipe 18 can also be flowed around on the outside by exhaust gas, wherein this partial flow of the exhaust gas is also illustrated by flow arrows 28.
  • the inner tube 18 has a very high surface temperature, and a particularly rapid evaporation of the aqueous urea solution 24 takes place.
  • the injector 22 opens obliquely into the inner tube 18, a particularly intensive and rapid mixing of the urea solution 24 and released from this ammonia with the exhaust gas is possible.
  • this mixing is assisted by a mixer 30 which, as shown here by way of example, is arranged downstream of a metering nozzle 32 receiving the injector 22.
  • the mixer 30 may also be disposed downstream of an outlet 34 of the inner tube 18 in alternative embodiments.
  • the outlet 34 of the inner tube 18 protrudes into the second tube 16, so that it comes to lie downstream of an end 36 of the corrugated tube 14. As a result, it is particularly reliably avoided that the corrugated tube 14 comes into contact with the urea solution 24.
  • the inner tube 18 is tapered towards an inlet 38 of the inner tube 18. This results in a region downstream of the inlet 38 favorable pressure conditions for introducing the aqueous urea solution 24 in this area. These pressure conditions are the rapid and intensive mixing of the urea solution 24 with the exhaust gas in the inner tube 18 beneficial.
  • both the first tube 12 and the second tube 16 are double-walled, so that an air gap insulation ensures particularly good thermal insulation of the exhaust gas located in the exhaust line 10. This can also be a particularly rapid evaporation and processing of the urea solution 24 can be achieved.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Dispersion Chemistry (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

L'invention concerne une ligne d'échappement (10) pour une voiture particulière, comprenant au moins un tuyau (12, 14, 16) entourant un tuyau intérieur (18) autour duquel peuvent circuler les gaz d'échappement et dans lequel les gaz d'échappement peuvent s'écouler en direction axiale. Un injecteur (22) est conçu pour introduire dans le tuyau intérieur (18) un agent de réduction (24) pouvant réduire les oxydes d'azote en azote et débouche dans le tuyau intérieur (18) en oblique par rapport à la direction axiale de ce dernier.
PCT/EP2011/002316 2010-06-30 2011-05-10 Système d'addition d'agent de réduction WO2012000582A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010025611A DE102010025611A1 (de) 2010-06-30 2010-06-30 Abgasstrang für ein Kraftfahrzeug
DE102010025611.0 2010-06-30

Publications (1)

Publication Number Publication Date
WO2012000582A1 true WO2012000582A1 (fr) 2012-01-05

Family

ID=43307987

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/002316 WO2012000582A1 (fr) 2010-06-30 2011-05-10 Système d'addition d'agent de réduction

Country Status (2)

Country Link
DE (1) DE102010025611A1 (fr)
WO (1) WO2012000582A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023145671A1 (fr) * 2022-01-28 2023-08-03 株式会社 三五 Dispositif de vaporisation d'agent réducteur

Families Citing this family (11)

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Publication number Priority date Publication date Assignee Title
DE102010035311A1 (de) * 2010-08-25 2012-03-01 Boa Balg- Und Kompensatoren-Technologie Gmbh Entkopplungselement, insbesondere für Abgasanlagen
FR2971546B1 (fr) * 2011-02-10 2015-04-24 Peugeot Citroen Automobiles Sa Ligne d'echappement pour moteur a combustion, dotee d'un organe de guidage d'un melange entre des gaz d'echappement et un agent reducteur
FR2975727B1 (fr) * 2011-05-25 2015-08-21 Peugeot Citroen Automobiles Sa Dispositif de melange d'un additif a l'etat liquide dans un gaz d'echappement, procede associe et ligne d'echappement comportant un tel dispositif
FR2981692B1 (fr) * 2011-10-20 2013-12-20 Peugeot Citroen Automobiles Sa Systeme d echappement d un vehicule automobile
US9410461B2 (en) 2011-12-14 2016-08-09 Avl List Gmbh Internal combustion engine
DE102012218565B4 (de) * 2012-10-11 2015-07-16 Eberspächer Exhaust Technology GmbH & Co. KG Abgasanlage mit Leitungselement
DE102013213484A1 (de) * 2013-07-10 2015-01-15 Witzenmann Gmbh Flexibles Leitungselement
EP3498995B1 (fr) 2014-01-31 2020-09-09 Donaldson Company, Inc. Agencement de dosage et de mélange pour utilisation dans un post-traitement d'échappement
DE102014015868A1 (de) * 2014-10-25 2016-04-28 Daimler Ag Abgasnachbehandlungseinrichtung für eine Verbrennungskraftmaschine, insbesondere eines Kraftwagens
CN105134349B (zh) * 2015-08-21 2017-08-29 天纳克（苏州）排放系统有限公司 排气处理装置
SE541082C2 (en) 2017-06-14 2019-04-02 Scania Cv Ab Exhaust additive distribution arrangement and system

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WO2005073524A1 (fr) * 2004-01-30 2005-08-11 Robert Bosch Gmbh Procede et dispositif de traitement posterieur de gaz d'echappement d'un moteur a combustion interne
DE102004020138A1 (de) 2004-04-24 2005-11-17 Daimlerchrysler Ag Reduktionsmittelzugabesystem
EP1712756A1 (fr) * 2005-04-15 2006-10-18 Iveco S.p.A. Module de mélange pour fluides dans un flux de gaz
EP1936137A1 (fr) * 2006-12-12 2008-06-25 Bayerische Motoren Werke Aktiengesellschaft Dispositif destiné à mélanger un moyen de réduction dans un flux de gaz d'échappement d'un moteur à combustion interne

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005073524A1 (fr) * 2004-01-30 2005-08-11 Robert Bosch Gmbh Procede et dispositif de traitement posterieur de gaz d'echappement d'un moteur a combustion interne
DE102004020138A1 (de) 2004-04-24 2005-11-17 Daimlerchrysler Ag Reduktionsmittelzugabesystem
EP1712756A1 (fr) * 2005-04-15 2006-10-18 Iveco S.p.A. Module de mélange pour fluides dans un flux de gaz
EP1936137A1 (fr) * 2006-12-12 2008-06-25 Bayerische Motoren Werke Aktiengesellschaft Dispositif destiné à mélanger un moyen de réduction dans un flux de gaz d'échappement d'un moteur à combustion interne

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023145671A1 (fr) * 2022-01-28 2023-08-03 株式会社 三五 Dispositif de vaporisation d'agent réducteur

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