WO2006084570A1 - Dispositif pour delivrer une charge additive dans le conduit d'echappement d'un moteur a combustion interne - Google Patents

Dispositif pour delivrer une charge additive dans le conduit d'echappement d'un moteur a combustion interne Download PDF

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Publication number
WO2006084570A1
WO2006084570A1 PCT/EP2006/000577 EP2006000577W WO2006084570A1 WO 2006084570 A1 WO2006084570 A1 WO 2006084570A1 EP 2006000577 W EP2006000577 W EP 2006000577W WO 2006084570 A1 WO2006084570 A1 WO 2006084570A1
Authority
WO
WIPO (PCT)
Prior art keywords
exhaust pipe
pipe section
internal combustion
combustion engine
delivery points
Prior art date
Application number
PCT/EP2006/000577
Other languages
German (de)
English (en)
Inventor
Christoph Espey
Uwe Gärtner
Peter Kozuch
Stephan Schenkel
Original Assignee
Daimlerchrysler 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 Daimlerchrysler Ag filed Critical Daimlerchrysler Ag
Publication of WO2006084570A1 publication Critical patent/WO2006084570A1/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]
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/02—Exhaust treating devices having provisions not otherwise provided for for cooling the device
    • F01N2260/024—Exhaust treating devices having provisions not otherwise provided for for cooling the device using a liquid
    • 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
    • F01N2610/11—Adding substances to exhaust gases the substance or part of the dosing system being cooled
    • 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
    • F01N3/08—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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • 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 a device for delivering an additive, in particular a reducing agent, in an exhaust pipe of an internal combustion engine according to the preamble of claim 1.
  • the object of the invention is therefore to provide a device for uniformly distributed delivery of an additive in an exhaust pipe, which is simpler.
  • the delivery points for the aggregate are arranged on an exhaust pipe section along a circumferential line, and a profile is connected to the exhaust pipe section such that an annular channel bounded by the profile and the outer wall of the exhaust pipe section is formed and aggregate fed from the delivery points into the annular channel via an inlet Inside the exhaust pipe section can be discharged.
  • the exhaust pipe section can be made in one piece.
  • the profile defining the annular channel together with the outer wall is arranged on the outside of the exhaust-gas line section and covers the annularly arranged delivery points. These can be formed as introduced into the exhaust pipe section nozzle body, which protrude into the exhaust pipe section or terminate flush with the inner wall of the exhaust pipe section discharge side.
  • the nozzle body are pressed or soldered into corresponding openings in the exhaust pipe section.
  • the profile is preferably approximately U-shaped and welded or soldered at the open end on the legs with the outer wall of the exhaust pipe. For the manufacture of the device, therefore, only the profile needs to be placed around the delivery points and connected to the exhaust gas. line section to be connected tightly. It can therefore be easily manufactured a dispensing device, which makes it possible to dispense an additive evenly distributed in an exhaust pipe.
  • An aggregate is to be understood here as a substance which can be distributed in the exhaust gas and which serves primarily for exhaust gas purification.
  • the additive may also be present as a solid, in particular as a powder
  • the device according to the invention is preferably provided for dispensing a liquid medium, for example an organic reducing agent.
  • the device according to the invention is particularly preferably used for dispensing an aqueous urea solution or another solution of a reducing agent suitable for the selective reduction of nitrogen oxides.
  • a corresponding catalytic converter is provided downstream of the device or the exhaust pipe section.
  • the aqueous urea solution can also be in atomized form before being fed to the annular channel, ie. be aerosolized.
  • the device has a plurality of delivery points, a particularly uniform distribution of the additive over the exhaust-gas line cross-section can be achieved. There are therefore preferably provided at least four delivery points.
  • the delivery points are formed as a wall of the exhaust pipe section passing through openings. This results in a particularly simple production, since the openings can be mounted in a simple manner, for example, as holes all around.
  • the openings may be slit-shaped or have any other shape.
  • the openings passing through the wall of the exhaust pipe section are at least approximately circular.
  • they have a small diameter lying in the millimeter range or less.
  • the diameter is in the range of 0, 3 mm to 3, 0 mm and more preferably between 0, 8 mm and 1, 5 mm.
  • a pressurized reducing agent liquid can be dispensed or sprayed so finely distributed.
  • the exhaust pipe section has a flange for connection to the exhaust pipe.
  • a flange is provided at both ends of the exhaust pipe section.
  • the annular channel is formed circumferentially over 360 ° and in a still further embodiment, the delivery points are arranged at a uniform distance from one another along the circumferential line. In this way, a particularly uniform distribution of the discharged aggregate can be achieved in the exhaust pipe.
  • the exhaust pipe section is assigned a displaceable inner sleeve, with which the delivery points can be covered on the delivery side.
  • the inner sleeve is preferably tight against the inner wall of the exhaust pipe section.
  • the displaceability of the inner sleeve may be given in the axial direction with respect to the exhaust pipe section and / or be realized by a rotatable embodiment.
  • the profile at least partially enclosing the cooling channel is provided to which a cooling fluid can be supplied.
  • a cooling fluid can be supplied.
  • the cooling fluid is a resource of the internal combustion engine.
  • a coolant is used or a lubricant of the internal combustion engine or air as the cooling fluid.
  • a corresponding fuel supply of the internal combustion engine can be used in an advantageous manner.
  • Fig. 1 is a schematic representation of an internal combustion engine with an exhaust system in which the apparatus according to the invention for the delivery of an aggregate is installed,
  • FIG. 2 shows a first advantageous embodiment of the device according to the invention for dispensing an aggregate
  • Fig. 3 shows a second advantageous embodiment of the device according to the invention for dispensing an additive
  • Fig. 4 shows a third advantageous embodiment of the device according to the invention for dispensing an additive.
  • the in Fig. 1 arrangement comprises a preferably designed as a diesel engine internal combustion engine 1, which receives its combustion air via an air line 2 and emits combustion exhaust gases via an exhaust pipe 3 to the environment.
  • an exhaust gas catalyst 9 is arranged in the exhaust pipe 3.
  • a device 6 for dispensing an additive hereinafter referred to briefly as a dispenser 6, inserted into the exhaust pipe 3.
  • the dispenser 6 may be designed to dispense any, preferably j edoch fluid additive, such as fuel or air. Without limiting the generality, however, it is assumed below that the dispensing device 6 is a device for the delivery of urea.
  • the catalytic converter 9 is formed as a so-called SCR catalyst for the reduction of nitrogen oxides by means of the discharged from the dispenser 6 urea.
  • the dispenser 6 is connected via a metering line 8 to a metering device, not shown, which carries out the needs-based dimensioning of the urea.
  • the metering device can be designed for a delivery of the urea in single-phase, liquid form or as a finely divided aerosol, wherein in the latter case expediently a compressed air support, not shown, is provided.
  • the dispenser 6 comprises an exhaust pipe section 4, which is inserted by means of end flanges 5 and 5 X in the exhaust pipe 3. Urea discharged into the exhaust gas line section 4 is transported by the exhaust gas flow to the catalytic converter 9, where conversion of the urea or ammonia liberated therefrom on the transport route with nitrogen oxides contained in the exhaust gas takes place.
  • Fig. 2 shows a first advantageous embodiment of the dispensing device 6 according to the invention in longitudinal section and in cross section, corresponding to the section line A - A shown.
  • the exhaust pipe section 4 on a circumferential line evenly distributed four as openings of circular cross-section formed discharge points 11, through which urea solution can be injected into the exhaust pipe section 4.
  • the openings 11 are in the radial direction with respect to the exhaust pipe section 4 nozzle-shaped narrowing or conical, whereby a particularly favorable spray behavior is achieved.
  • a manner not shown may be introduced as discharge points 11 and special spray body or spray nozzles in openings of the exhaust pipe section 4.
  • the injection thus takes place preferably in the radial direction with respect to exhaust gas routed through the exhaust gas conduit section 4, which leads to a turbulence of the injected urea solution and assists in its mixing and evaporation.
  • the distribution of the supplied via the supply line 8 urea solution to the openings 11 via a circumferential annular channel 10, which is bounded by the outer wall of the exhaust pipe section 4 and the profile 7.
  • the dispenser 6 shown in FIG. 3 differs from the dispenser 6 shown in FIG. 2 through an inner sleeve 12, which, as indicated by the double arrow 12, is axially displaceable and tight against the inner wall of the Abgastechnischs- section 4. It is envisaged that when the metering is stopped or ended, the inner sleeve 12 is displaced into a position in which the openings 11 are covered. In this way, an undesirable penetration or dripping of urea solution from the distribution channel 10 via the openings 11 into the exhaust pipe section 4 and the downstream exhaust system can be avoided. In addition, a crystallization of urea in the openings 11 and thus clogging of the openings 11 is avoided.
  • any existing deposits on the inner wall of the exhaust pipe section 4 can be mechanically removed by moving the inner sleeve. If urea solution is to be metered, then the inner sleeve 12 is pushed back again, so that the openings 11 are released.
  • other means for closing the openings 11 may be provided.
  • a rotatable inner sleeve is advantageous. Preferably, this has circumferentially extending slots, which are arranged at a dosage above the openings 11, so that urea solution can be sprayed off unhindered. If the openings 11 are to be covered, then the inner sleeve is twisted, so that the openings are covered.
  • a further advantageous embodiment of the dispensing device 6 according to the invention is shown, which extends through a cooling channel 14 from that shown in FIG. 2 distinguishes dispensing device.
  • the cooling channel 14 surrounds the profile 7 at least in sections, preferably, however, as shown completely along its extension, so that a concentric arrangement results.
  • the cooling channel 14 is preferably delimited, as shown, by a likewise approximately U-shaped profile 15 into which a feed line 16 and a discharge line 17 for a cooling fluid are introduced. These are preferably mounted at diametrically opposite locations so that the cooling fluid can circulate all around. Cooling fluid or lubricating oil of the internal combustion engine 1 is preferably used as the cooling fluid. But it can also be used cooling air or compressed air.

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

Abstract

L'invention concerne un dispositif permettant de délivrer une charge additive, notamment un agent de réduction, qui comprend plusieurs points de distribution (11), disposés en anneau, dans le conduit d'échappement (3) d'un moteur à combustion interne (1). Selon l'invention, les points de distribution (11) sont aménagés sur une section de conduit d'échappement (11), le long d'une ligne périphérique et un profilé (7) est relié à la section de conduit d'échappement (4), de sorte à former un canal annulaire (10) délimité par le profilé (7) et la paroi extérieure de la section de conduit d'échappement (4) et chevauchant les points de distribution. La charge additive provenant du canal annulaire (10), acheminée par l'intermédiaire d'une amenée (8), peut être délivrée à l'intérieur de la section de conduit d'échappement, en passant par les points de distribution (4). L'invention s'utilise notamment dans des véhicules utilitaires équipés d'un moteur à combustion interne à compression d'air.
PCT/EP2006/000577 2005-02-12 2006-01-24 Dispositif pour delivrer une charge additive dans le conduit d'echappement d'un moteur a combustion interne WO2006084570A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005006426.4 2005-02-12
DE102005006426A DE102005006426A1 (de) 2005-02-12 2005-02-12 Vorrichtung zur Abgabe eines Zuschlagstoffes in eine Abgasleitung einer Brennkraftmaschine

Publications (1)

Publication Number Publication Date
WO2006084570A1 true WO2006084570A1 (fr) 2006-08-17

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PCT/EP2006/000577 WO2006084570A1 (fr) 2005-02-12 2006-01-24 Dispositif pour delivrer une charge additive dans le conduit d'echappement d'un moteur a combustion interne

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Country Link
DE (1) DE102005006426A1 (fr)
WO (1) WO2006084570A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009071088A1 (fr) * 2007-12-05 2009-06-11 Grundfos Nonox A/S Agencement de buse

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008011329A1 (de) * 2008-02-27 2009-09-10 Bombardier Transportation Gmbh Schienenfahrzeug mit Abgasreinigung
DE102022132122A1 (de) 2022-12-05 2024-06-06 Purem GmbH Abgasbehandlungsanordnung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19738859A1 (de) * 1997-09-05 1999-03-11 Bosch Gmbh Robert Gemischabgabevorrichtung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19738859A1 (de) * 1997-09-05 1999-03-11 Bosch Gmbh Robert Gemischabgabevorrichtung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009071088A1 (fr) * 2007-12-05 2009-06-11 Grundfos Nonox A/S Agencement de buse
US9249708B2 (en) 2007-12-05 2016-02-02 Grundfos Nonox A/S Nozzle arrangement

Also Published As

Publication number Publication date
DE102005006426A1 (de) 2006-08-24

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