WO2017201558A1 - Dispositif de post-traitement des gaz d'échappement d'un moteur à combustion interne - Google Patents

Dispositif de post-traitement des gaz d'échappement d'un moteur à combustion interne Download PDF

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Publication number
WO2017201558A1
WO2017201558A1 PCT/AT2017/060136 AT2017060136W WO2017201558A1 WO 2017201558 A1 WO2017201558 A1 WO 2017201558A1 AT 2017060136 W AT2017060136 W AT 2017060136W WO 2017201558 A1 WO2017201558 A1 WO 2017201558A1
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WO
WIPO (PCT)
Prior art keywords
exhaust gas
channel
section
cross
aftertreatment device
Prior art date
Application number
PCT/AT2017/060136
Other languages
German (de)
English (en)
Inventor
Michael PFRAGNER
Marko DECKER
Alexander RUTH
Martin Schüssler
Original Assignee
Avl List Gmbh
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 Avl List Gmbh filed Critical Avl List Gmbh
Priority to DE112017002612.1T priority Critical patent/DE112017002612A5/de
Publication of WO2017201558A1 publication Critical patent/WO2017201558A1/fr

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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]
    • F01N3/2073—Selective catalytic reduction [SCR] with means for generating a reducing substance from the exhaust gases
    • 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
    • B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • B01F25/3131—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
    • 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
    • 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
    • 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
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • 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
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F2025/91—Direction of flow or arrangement of feed and discharge openings
    • B01F2025/913—Vortex flow, i.e. flow spiraling in a tangential direction and moving in an axial direction
    • 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
    • B01F2025/93—Arrangements, nature or configuration of flow guiding elements
    • B01F2025/931—Flow guiding elements surrounding feed openings, e.g. jet nozzles
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/16—Methods or apparatus for fitting, inserting or repairing different elements by using threaded joints
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/30—Tubes with restrictions, i.e. venturi or the like, e.g. for sucking air or measuring mass flow
    • 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
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • F01N2610/102—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance after addition to exhaust gases, e.g. by a passively or actively heated surface in the exhaust conduit
    • 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
    • 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 aftertreatment device for an internal combustion engine, comprising: at least one exhaust gas supply line, at least one inner channel with an inlet end and an exit end, the outer channel portion surrounding the inner channel shell with an inlet end and an exit end, and at least one injector for introducing an additive, in particular a reducing agent into an exhaust gas flow, wherein the inner channel and the outer channel portion pass downstream of their outlet-side ends into a common channel portion and are interconnected in the region of the inlet-side end of the inner channel via a connecting passage.
  • exhaust gases from an internal combustion engine are removed by means of a suitable exhaust aftertreatment device, e.g. in the form of catalyst elements to convert environmentally harmful combustion products to harmless gaseous compounds.
  • a suitable exhaust aftertreatment device e.g. in the form of catalyst elements to convert environmentally harmful combustion products to harmless gaseous compounds.
  • Increasingly stringent emissions regulations require ever more complex structures.
  • DE 10 2009 036511 A1 shows an exhaust aftertreatment device for internal combustion engines, in particular an SCR catalytic converter, with an input device for water-urea mixture. Downstream of the input device, a mixing device and a deflection device are provided.
  • DE 10 2010 056314 A1 discloses (in particular in Fig. 3) a device for distributing fluids (esp. Water-urea mixture) in exhaust systems of an internal combustion engine, wherein a plurality of individual measures is combined.
  • an inner tube is arranged, in which an injection nozzle of an injection device opens.
  • a portion of the exhaust stream is passed on the outside of the inner tube.
  • Downstream of the inner tube the proportion of the exhaust gas flow flowing through the inner tube and the proportion of the exhaust gas flow flowing through the inner tube reunite.
  • By flowing around the inner tube is heated and thus promotes evaporation of fluid on the surfaces of the inner tube and the mixing device.
  • the distribution of the exhaust gas flows takes place exclusively through the choice of pipe diameter.
  • a disadvantage is in particular the complex construction that results from the majority of individual measures. Such a construction requires a lot of space, especially in the longitudinal direction of the device. If a corresponding construction is selected, a change or adaptation is hardly possible or only with great effort.
  • the production is to be made possible with low construction and expense.
  • the at least one exhaust gas supply line opens into the outer channel portion and that in the outer channel portion between the junction of the exhaust gas supply line and the transition to the common channel section at least a cross-section regulating element for flow regulation is arranged ,
  • cross-section-regulating element forms at least one passage or passage opening.
  • cross-section-regulating element thus allows the passage of exhaust gas, but specifically determines that portion of the exhaust gas, which flows through the outer channel directly to the common channel section.
  • the portion of the exhaust gas flow that does not flow through the cross-section regulating element passes into the common passage section via the connecting passage and the inner passage.
  • the previously divided exhaust gas streams unite.
  • the exhaust gas flow conducted in the outer channel ensures a reliable and uniform heating of the walls delimiting the inner channel and thereby prevents attaching of - in particular liquid - additives and / or reducing agents such as urea (mixtures) on the inner wall of the inner channel. It is preferred that the exhaust gas flow in the outer channel section is not yet offset with the additive in order to prevent deposition on the outer walls of the outer channel.
  • the admixture takes place only after the exhaust gas flow has been divided, preferably in the connecting passage and / or in the inner passage.
  • the solution according to the invention allows a division such that 10-30% (preferably about 20%) of the exhaust gas flow through the cross-section regulating element, while the rest (70-90%, preferably 80%) is passed through the inner channel.
  • the cross-section regulating element may, for. B. be designed as a flange, aperture or obstacle in the outer channel; it may be releasably, firmly or integrally connected to the wall of the inner or outer channel.
  • the inner channel is formed by an inner tube and the outer channel portion between the inner tube and an outer tube surrounding the inner tube (tube-in-tube arrangement). This allows a particularly simple and inexpensive construction. A coaxial arrangement of the tubes is preferred.
  • the inner channel and the outer channel section are completely separated from each other in the area between the opposite ends of the inner channel. This prevents premature mixing of the exhaust gas portion flowing in the outer channel section (preferably not yet offset with the additive) and the exhaust gas component flowing in the inner channel.
  • the division of the exhaust gas flow emerging from the at least one exhaust gas supply line is well defined: the partial flow running along the first exhaust path has the function of heating the walls bounding the inner channel; the partial flow running along the second exhaust path serves for mixing with the additive.
  • the cross-section-regulating element is formed by a preferably exchangeable flange part, wherein the gas flow is divided so that the inner tube flows around and is heated.
  • the element which alters the cross section of the outer channel section thus has flange surfaces and preferably also has fastening holes along its circumference.
  • a flange part can be formed in a simple manner in the form of a disc with recesses or passage openings. A flange also allows for flexible application, depending on requirements, flange parts can be used with different cross sections.
  • the flange part may have attachment holes (preferably peripherally arranged) in its peripheral region, with which the flange part may be detachably connected to a fastening flange (of a component or component) of the exhaust gas aftertreatment device.
  • a fastening flange of a component or component
  • Such a flexible solution is particularly suitable for a prototype application, since the flow-through cross section in the region of the flange (by replacing the flange) can be increased if necessary and can be easily exchanged in the design as a flange.
  • the cross-sectional constriction of the cross-sectional regulating element is at least 50%, preferably at least 66%, relative to the cross section of the outer channel in the region of the outer channel adjacent to the cross-sectional regulating element.
  • a backflow is caused on the cross-section regulating element, so that a large part of the exhaust gas flow is conducted through the connecting passage and the inner channel.
  • the cross-section-regulating element has passages which are preferably open towards the jacket of the inner tube and / or are distributed around the inner channel. This forces the partial flow to flow more directly along the jacket of the inner tube.
  • the cross-section-regulating element is formed circumferentially around the inner tube and / or forms a holder for the inner tube.
  • the outer tube is connected via a mounting flange to a component of the exhaust aftertreatment device and the cross-section regulating element is fixed by the mounting flange.
  • the at least one exhaust gas supply is formed in the relevant component.
  • the cross-section regulating element therefore no separate attachment mechanisms must be provided.
  • a component of the exhaust aftertreatment device in which the at least one exhaust gas supply is formed, also forms the connection passage.
  • the connecting passage is closed at the front. This results in lateral supply of exhaust gases a particularly compact and space-saving design.
  • the at least one exhaust gas supply between the connecting passage and the cross-section regulating element opens into the outer channel.
  • the at least one exhaust gas inlet opens transversely, preferably perpendicularly to the longitudinal direction of the outer channel in this. This results in a lateral inflow of the exhaust gas.
  • the inlet opening of the exhaust gas supply in the outer channel facing the lateral surface of the inner tube.
  • At least two exhaust gas feeds open into the outer channel preferably from opposite sides or in the longitudinal direction of the outer channel one behind the other.
  • the invention thus also allows the integration of two exhaust gas feeders, the degree of turbulence also increasing on entry.
  • the outer channel at least between the mouth of the exhaust gas supply and the transition into the common channel portion has a substantially constant cross-section. This achieves the most uniform possible heating along the longitudinal direction of the channels.
  • connection passage is asymmetrical with respect to the axis of the inner channel and / or that the exhaust gas aftertreatment device has at least one asymmetric structure, preferably baffles and / or airfoils, for swirling the flow through the inner one Channel, wherein preferably the at least one asymmetric structure in the region of the inlet-side end of the inner channel is formed.
  • the outlet opening of the injector is arranged in the connection passage or in the inner channel or directed towards the inlet-side end of the inner channel.
  • the additive is added only in the partial flow flowing through the connecting passage and the inner passage (second exhaust path).
  • the injector is designed to introduce the additive in the axial direction of the inner channel, preferably centrally (axial dosing). As a result, the degree of mixing is additionally increased.
  • the common channel section narrows in the flow direction, whereby an increase in the flow velocity is achieved.
  • a particular embodiment provides two tubes, wherein an inner tube is surrounded by an outer tube and between the inner and the outer tube is an area (outer channel), in which a part of the exhaust gas flow can flow through.
  • the inner tube is connected via a flange with the outer tube, which flange not only serves as a "support” for the inner tube, but also limits the mass flow in the space between the inner and outer tube.
  • the flange part has a plurality of recesses or bores via which a part of the total exhaust gas flow is led outside along the inner tube. Through the openings in the flange part of a part of the mass flow, which flows between the inner and outer tube is forwarded and so the jacket of the inner tube can be heated with this partial mass flow.
  • the injector is preferably positioned to inject into the inner tube heated from the outer tube, the mass flow into the inner tube being preferably displaced by baffles, setting vanes, etc., or an asymmetric feed into a swirl.
  • a uniform distribution is achieved in addition by the fact that the injector is metered axially into a tube, which should be largely avoided, to spray on the walls.
  • the tubes can be chosen such that the cross sections in the flow direction are getting smaller and therefore increases the flow rate.
  • a portion (e.g., of about 20%) of the exhaust gas is not supplied to the injector, but used to heat the inner tube from the outside. As a result, urea deposits on the inner tube are additionally avoided.
  • the two exhaust gas streams are brought together again at the end of the two pipes.
  • FIG. 1 shows an exhaust gas aftertreatment device according to the invention in an exploded view
  • Figure 2 shows the exhaust aftertreatment device in section parallel to the longitudinal axis.
  • Fig. 5 shows a variant of the exhaust aftertreatment device in a
  • Fig. 6 shows a further variant of the invention with an asymmetric
  • an additive in particular a Reducing agent, for example, a urea solution
  • the inner channel 3 is formed by an inner tube 13 and the outer channel 4 extends between the inner tube 13 and an outer tube 14, which - concentrically arranged - the inner tube 13 surrounds.
  • the inner channel 3 and the outer channel 4 are completely separated from each other in the area between the opposite ends 3a, 3b of the inner channel 3 by the inner tube 13.
  • the exhaust gas is supplied from the exhaust gas supply lines 2 substantially in the outer channel. 4
  • the channels 3, 4 are connected to one another via a connecting passage 6.
  • exhaust gases pass from the inlet-side end 4a of the outer channel 4 into the inlet-side end 3a of the inner channel 3.
  • the inner channel 3 and the outer channel 4 merge into a common channel section 5 at their outlet-side ends 3b, 4b.
  • the exhaust gas portions of the inner 3 and the outer channel 4 are reunited into a total flow in the connecting passage 5.
  • at least one cross-section regulating element 8 for regulating the flow is arranged between the junction of the exhaust gas feeders 2 and the transition into the common channel section 5.
  • the exhaust gas supply lines 2 open between the connecting passage 6 and the cross-section regulating element 8 and transversely (here: perpendicular) to the longitudinal direction of the outer channel 4 in this.
  • the longitudinal direction of the outer channel 4 is understood here essentially the longitudinal central axis 40.
  • the exhaust gas supply lines 2 open into the outer channel 4 from opposite sides.
  • Fig. 5 shows a variant in which the exhaust gas supply lines 2 offset in the outer channel 4 in the longitudinal direction of the outer channel 4 open - a preferred variant, if there is little space available.
  • a first exhaust gas path 15 is formed from the junction of the exhaust gas supply lines 2 into the outer channel 4, through the cross-section regulating element 8 and the outer channel 4 until the transition into the common channel section 5;
  • a second exhaust path 16 is formed from the junction of the exhaust gas supply lines 2 into the outer channel 4, through the communication passage 6, and through the inner passage 3 until the transition to the common passage section 5.
  • the cross-section regulating element 8 is formed by an exchangeable flange part, which for this purpose has passage openings 9 or recesses.
  • the passage openings 9 are only partially marked with reference lines in the figures for reasons of clarity.
  • the flange part extends in a direction normal to the longitudinal central axis 40 extending plane at least between the outer tube 14 and the inner tube 13 and in the radial direction beyond.
  • the passage openings 9 are here open to the jacket of the inner tube 13 and arranged distributed around the inner channel 3.
  • the cross-sectional constriction of the cross-section regulating element 8 relative to the cross section of the outer channel 4 in the region of the outer channel 4 adjoining the cross-sectional regulating element 8 upstream or downstream is at least 50%, preferably at least 66%.
  • the cross-section regulating element 8 here in the form of the flange, is formed circumferentially around the inner tube 13 and at the same time forms a holder for the inner tube 13.
  • the outer tube 14 is connected via a mounting flange 12 to a component 11 in which the at least one Exhaust gas supply line 2 is formed, connected.
  • the cross-section regulating element 8 is fixed by the mounting flange 12.
  • the component 11, in which the at least one exhaust gas supply line 2 is formed, also forms the connection passage 6 closed on the end side.
  • the outer channel 4 at least between the junction of the exhaust gas supply line 2 and the transition into the common channel section 5, apart from the cross-section regulating element, a substantially constant cross-section.
  • a temperature expansion section in the form of a fold structure 41 in the outer tube 14 may be provided, which also serves to compensate for movements.
  • the connecting passage 6 may be formed asymmetrically with respect to the longitudinal central axis of the inner channel 3.
  • the exhaust aftertreatment device 1 may have at least one spiral or circular structure 10, preferably baffles and / or airfoils, for in-twisting the flow through the inner channel 3, as shown in FIG. 6 are shown.
  • the asymmetrical structure 10 is preferably formed in the region of the inlet-side end 3a of the inner channel 3 - in FIG. 2 a baffle region 10a is shown, in which the spiral or circular structures 10 shown in FIG. For reasons of clarity, only some of the structures are provided with reference lines in FIG.
  • the baffles or blade blades protrude radially from the outer tube 14 to approximately half the radius of the inner tube 13 in the direction of the longitudinal axis 40 of the outer tube 14.
  • outlet opening of the injector 7 can be arranged in the axial direction within the inner channel 3 or the inner tube 13 (alternatively: in the connecting passage 6).
  • the outlet opening of the injector can / may also face the inlet-side end 3a of the inner channel 3, ie in this embodiment, not shown, run normal to the longitudinal axis 40.
  • the injector 7 of the present embodiment is designed to introduce the additive in the axial direction of the inner channel 3, preferably centrally. That the outlet opening is located in the region of the longitudinal axis of the inner channel 3 or inner tube 13.
  • Fig. 2 From Fig. 2 is also seen that the common channel section 5 narrows in the flow direction, in addition to increase the flow rate.
  • the invention is not limited to the illustrated embodiments. Thus, for example, only one exhaust gas supply can be provided or open it in another way into the outer channel.
  • the cross-section regulating member (s) may be formed differently than illustrated, e.g. B. as a panel, obstacle, etc., - as well as the other aspects can be modified within the scope of the invention.

Abstract

L'invention concerne un dispositif de post-traitement des gaz d'échappement (1) d'un moteur à combustion interne, qui comprend : - au moins une arrivée de gaz d'échappement (2), - un canal intérieur (3), - un canal extérieur (4), qui entoure le canal intérieur (3) à la manière d'une enveloppe, - un injecteur (7) destiné à introduire un additif, en particulier un agent de réduction tel qu'une solution d'urée, dans le flux de gaz d'échappement. Le but de l'invention est d'augmenter le taux de mélange entre les gaz d'échappement et l'additif, d'éviter une fixation de l'additif et d'augmenter la flexibilité de la structure. A cet effet, ladite au moins une arrivée de gaz d'échappement (2) débouche dans le canal extérieur (4), et au moins un élément (8) modifiant la section de passage afin de réguler le débit est disposé dans le canal extérieur (4) entre l'embouchure de l'arrivée de gaz d'échappement (2) et le passage vers la partie de canal (5) commune.
PCT/AT2017/060136 2016-05-23 2017-05-23 Dispositif de post-traitement des gaz d'échappement d'un moteur à combustion interne WO2017201558A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112017002612.1T DE112017002612A5 (de) 2016-05-23 2017-05-23 Abgasnachbehandlungs-Vorrichtung für eine Brennkraftmaschine

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ATA50466/2016A AT518758B1 (de) 2016-05-23 2016-05-23 Abgasnachbehandlungs-vorrichtung für eine brennkraftmaschine
ATA50466/2016 2016-05-23

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US11603788B2 (en) 2020-06-16 2023-03-14 Cnh Industrial America Llc Mixing conduits including swirler vanes for use within an exhaust treatment system

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US20070110642A1 (en) * 2004-09-02 2007-05-17 Nissan Diesel Motor Co., Ltd. Exhaust gas purifying apparatus
US20080295497A1 (en) * 2007-05-08 2008-12-04 Friedrich Boysen Gmbh & Co. Kg Device for the distribution of flowable additives in exhaust gas systems
WO2012052690A1 (fr) * 2010-10-21 2012-04-26 Mgi Coutier Dispositif d'introduction d'un additif liquide dans une ligne d'échappement de moteur thermique
EP2465602A2 (fr) * 2010-12-14 2012-06-20 Proventia Emission Control Oy Procédé et dispositif de nettoyage des gaz d'échappement
WO2013136614A1 (fr) * 2012-03-15 2013-09-19 日立造船株式会社 Dispositif de purification de gaz d'échappement
US20160061078A1 (en) * 2014-09-03 2016-03-03 Friedrich Boysen Gmbh & Co. Kg Exhaust Gas System of an Internal Combustion Engine

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GB2452249A (en) * 2007-08-17 2009-03-04 Emcon Technologies Germany An exhaust system
SE535235C2 (sv) * 2010-10-22 2012-06-05 Scania Cv Abp Arrangemang för att införa ett vätskeformigt medium i avgaser från en förbränningsmotor
JP5349575B2 (ja) * 2011-12-27 2013-11-20 株式会社小松製作所 還元剤水溶液ミキシング装置及び排気ガス後処理装置
DE102012014333A1 (de) * 2012-07-20 2014-01-23 Man Truck & Bus Ag Mischvorrichtung zur Nachbehandlung von Abgasen

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Publication number Priority date Publication date Assignee Title
US20070110642A1 (en) * 2004-09-02 2007-05-17 Nissan Diesel Motor Co., Ltd. Exhaust gas purifying apparatus
US20080295497A1 (en) * 2007-05-08 2008-12-04 Friedrich Boysen Gmbh & Co. Kg Device for the distribution of flowable additives in exhaust gas systems
WO2012052690A1 (fr) * 2010-10-21 2012-04-26 Mgi Coutier Dispositif d'introduction d'un additif liquide dans une ligne d'échappement de moteur thermique
EP2465602A2 (fr) * 2010-12-14 2012-06-20 Proventia Emission Control Oy Procédé et dispositif de nettoyage des gaz d'échappement
WO2013136614A1 (fr) * 2012-03-15 2013-09-19 日立造船株式会社 Dispositif de purification de gaz d'échappement
US20160061078A1 (en) * 2014-09-03 2016-03-03 Friedrich Boysen Gmbh & Co. Kg Exhaust Gas System of an Internal Combustion Engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11603788B2 (en) 2020-06-16 2023-03-14 Cnh Industrial America Llc Mixing conduits including swirler vanes for use within an exhaust treatment system

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AT518758B1 (de) 2018-11-15
DE112017002612A5 (de) 2019-02-21

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