WO2019029880A1 - Dispositif de préparation de mélange, système de post-traitement de gaz d'échappement - Google Patents

Dispositif de préparation de mélange, système de post-traitement de gaz d'échappement Download PDF

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Publication number
WO2019029880A1
WO2019029880A1 PCT/EP2018/066105 EP2018066105W WO2019029880A1 WO 2019029880 A1 WO2019029880 A1 WO 2019029880A1 EP 2018066105 W EP2018066105 W EP 2018066105W WO 2019029880 A1 WO2019029880 A1 WO 2019029880A1
Authority
WO
WIPO (PCT)
Prior art keywords
exhaust
mixing tube
mixing
exhaust gas
vortex chamber
Prior art date
Application number
PCT/EP2018/066105
Other languages
German (de)
English (en)
Inventor
Marco DE PELLEGRINI
Daqing JI
Christian Alt
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2019029880A1 publication Critical patent/WO2019029880A1/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
    • 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
    • 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
    • F01N3/103—Oxidation catalysts for HC and CO only
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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 mixture preparation with the features of the preamble of claim 1. Furthermore, the invention relates to an exhaust aftertreatment system with a device for mixture preparation, in particular for the evaporation and mixing of a reducing agent with exhaust gas.
  • SCR Selective Catalytic Reduction
  • NH3 ammonia
  • HWL urea-water solution
  • AI is an example of an exhaust aftertreatment system with an exhaust pipe and the exhaust pipe to ordered injector for an exhaust aftertreatment agent. Downstream of the injector means are provided which serve to mix the exhaust aftertreatment agent with the exhaust gas to achieve optimum mixture treatment upstream of a catalyst.
  • the device comprises for this purpose a mixing device with a plurality of wing-like air guide elements which are static and extend from radially outside to radially inside a mixing tube. About the air guide elements, the exhaust stream is set in a swirling motion, which promotes mixing with the exhaust aftertreatment agent in the mixing tube.
  • Known devices for mixture preparation in an exhaust aftertreatment system usually have a mixing tube with a length between 400 mm and 1000 mm.
  • the length of the mixing tube also increases the degree of mixing.
  • the available space is usually limited, so that no optimal mixing is achieved.
  • the present invention is therefore based on the object of specifying a device for mixture preparation for an exhaust aftertreatment system, which is particularly compact and at the same time allows optimal mixing in order to increase the efficiency of the exhaust gas purification.
  • the device proposed for mixture preparation comprises an injection device for injecting a liquid reducing agent into an exhaust gas stream and a mixing tube leading the exhaust gas flow with static flow guide elements for vaporizing and mixing the reducing agent with the exhaust gas.
  • the mixing tube opens in the flow direction of the exhaust gas into a cylindrical vortex chamber, the mixing tube at least is aligned in the region of the mouth substantially tangential with respect to the cross section of the vortex chamber.
  • the device according to the invention accordingly includes in the flow direction of the exhaust gas, a swirl chamber to the mixing tube.
  • the vortex chamber lengthens the mixing section, since the gas mixture undergoes further mixing in the vortex chamber. Accordingly, the mixing and thus the mixture preparation is optimized, which leads to an efficient exhaust gas purification in a downstream SCR catalytic converter.
  • the further mixing in the vortex chamber is based on an additional turbulence of the gas mixture, which is due to further mixing and / or Strömungsleitimplantation in the vortex chamber, the geometry of the vortex chamber and / or on the substantially tangential connection of the mixing tube to the vortex chamber.
  • substantially tangential means that the pipe section of the mixing tube which opens into the vortex chamber is arranged radially eccentrically or parallel offset relative to a radial with respect to the cross section of the vortex chamber.
  • the mixture flow is caused to swirl as it flows into the vortex chamber, thereby further increasing the degree of mixing.
  • the static flow guide elements are preferably used to set the mixture flow into a twist, so that an angular momentum promoting the mixing is already generated in the mixing tube. This means that preferably a first turbulence of the gas mixture in the mixing tube and a further turbulence takes place in the vortex chamber, whereby the mixture preparation is further optimized.
  • the mixing tube has a bent pipe section and a straight pipe section, wherein the straight pipe section has a longitudinal axis A, with respect to a longitudinal axis B of the swirl chamber in an angle ⁇ ⁇ 90 ° is employed.
  • the mixing tube preferably has a curved pipe section for connection to an exhaust pipe.
  • the exhaust gas flows via the bent pipe section into the mixing tube, so that the static flow guide elements provided in the mixing pipe are optimally flown.
  • the exhaust pipe has a longitudinal axis C, which is preferably employed with respect to the longitudinal axis A of the straight pipe section of the mixing tube at an angle ß, which is also smaller than 90 °.
  • an angle ⁇ ⁇ 60 °, further preferably an angle ⁇ 45 ° is selected. In this way, the space requirement of the device can be further reduced.
  • the injection device for injecting the reducing agent at the opposite end of the vortex chamber of the mixing tube is arranged.
  • the injection device is aligned coaxially with the longitudinal axis A of the straight tube section of the mixing tube, in order to ensure that the drops of the reducing agent impinge on the static flow guide elements. Because when hitting the drops are broken up into smaller drops, so that the reducing agent evaporates faster.
  • the static flow guide elements of the mixing tube are designed like a wing. This means that they are designed flat to form a sufficiently large hit area for the drops.
  • the wing-like static flow guide elements are preferably employed with respect to a radial plane in order to set the exhaust gas flow flowing therethrough into a swirl, wherein the exhaust gas flow entrains the droplets.
  • the wing-like static flow guide elements protrude from radially outward to radial inside into the mixing tube, wherein they may be mounted radially outward on the inner peripheral side of the mixing tube or a tube piece inserted therein.
  • the additionally proposed exhaust aftertreatment system has an S CR catalyst and a device according to the invention for mixture preparation.
  • the device for mixture preparation is upstream of the SCR catalyst in the flow direction of the exhaust gas, so that in the SCR catalyst improved exhaust gas purification is achieved due to the good mixture preparation. In this way, the efficiency of the exhaust aftertreatment system can be increased.
  • the device for mixture preparation itself is preceded by an oxidation catalytic converter and / or a particle filter in the flow direction of the exhaust gas, so that the exhaust gas purification is further optimized.
  • the particulate matter load can be reduced by an upstream particle filter.
  • FIG. 1 shows a schematic illustration of an exhaust aftertreatment system with a device according to the invention for mixture preparation
  • Fig. 2 is a schematic side view of the device for mixture preparation of the exhaust aftertreatment system of Fig. 1 and
  • FIG. 3 is a schematic plan view of the device for mixture preparation of the exhaust aftertreatment system of FIG. 1.
  • the exhaust aftertreatment system shown in FIG. 1 for the aftertreatment of the exhaust gas of an internal combustion engine comprises an S CR catalyst 7, which is to reduce the nitrogen oxide emissions of the internal combustion engine.
  • a reducing agent 3 is supplied in advance to the exhaust gas, with the reducing agent 3 in particular being an aqueous urea.
  • Substance solution can act.
  • the liquid reducing agent 3 is introduced by means of an injection device 2 as a spray, that is, in drop form, so that evaporation and mixing of the reducing agent 3 with the exhaust gas is brought about.
  • the S CR catalyst 7 is preceded by a device 1 for mixture preparation.
  • the device 1 for mixture preparation comprises a mixing tube 4 and a vortex chamber 5. Via the vortex chamber 5, the device 1 is connected to the S CR catalytic converter 7. Via the mixing tube 4, a connection with an exhaust pipe 6 is made, via which the exhaust gas enters the device 1. In the transition region from the exhaust pipe 6 in the mixing tube 4, the injection device 2 is arranged, in such a way that the spray is introduced into the mixing tube 4 in the axial direction. The introduced by means of the injector 2 reducing agent 3 meets in
  • the mixing tube 4 is oriented substantially tangentially with respect to the vortex chamber 5, so that the turbulence of the mixture flow in the vortex chamber 5 is continued.
  • the mixing section is extended. If necessary, therefore, the mixing tube 4 can be shortened to make the device 1 for mixture preparation more compact.
  • the space requirement of the device 1 is further reduced if - as shown in Figures 1 and 2 - the mixing tube 4 and a straight pipe section 4.2 of the mixing tube 4 is made at an angle ⁇ relative to the vortex chamber 5.
  • Belsch 5 intersects at the angle ⁇ , wherein in the present case the angle ⁇ is 45 °.
  • the straight running pipe section 4.2 of the mixing tube 4 has at its ends in each case a bent pipe section 4.1, 4.3, so that the transition into the swirl chamber 5 on the one hand and in the exhaust pipe 6 on the other hand is designed to optimize flow.
  • a position of the mixing tube 4 or of the straight tube section 4.2 of the mixing tube 4 relative to the exhaust pipe 6 can also be achieved via the bent pipe section 4.2, so that the longitudinal axis A of the mixing pipe 4 intersects the longitudinal axis C of the exhaust pipe 6 at an angle .beta in the present case also 45 °. In this way, the space requirement of the device can be minimized.
  • FIG. 1 In order to further reduce the particulate matter pollution in addition to the reduction of nitrogen oxides, it is possible-as shown in FIG. 1 -for the device 1 for mixture preparation to be preceded by a particle filter 9. This can be combined with an oxidation catalytic converter 8 in order to make exhaust gas purification even more efficient.

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

Abstract

L'invention concerne un dispositif (1) de préparation de mélange pour un système de post-traitement de gaz d'échappement. Le dispositif comprend un système d'injection (2) servant à injecter un agent de réduction (3) liquide dans un flux de gaz d'échappement, ainsi qu'un tube mélangeur (4) guidant le flux de gaz d'échappement, pourvu d'éléments d'acheminement d'écoulement (10) statiques servant à évaporer et à mélanger l'agent de réduction (3) aux gaz d'échappement. Selon l'invention, le tube mélangeur (4) débouche, dans la direction d'écoulement des gaz d'échappement, dans une chambre de turbulence (5) de forme cylindrique. Le tuyau mélangeur (4) est orienté au moins dans la zone de l'embouchure sensiblement de manière tangentielle par rapport à la section transversale de la chambre de turbulence (5). L'invention concerne en outre un système de post-traitement de gaz d'échappement comprenant un catalyseur SCR (7) et un dispositif (1) selon l'invention.
PCT/EP2018/066105 2017-08-10 2018-06-18 Dispositif de préparation de mélange, système de post-traitement de gaz d'échappement WO2019029880A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017213954.4A DE102017213954A1 (de) 2017-08-10 2017-08-10 Vorrichtung zur Gemischaufbereitung, Abgasnachbehandlungssystem
DE102017213954.4 2017-08-10

Publications (1)

Publication Number Publication Date
WO2019029880A1 true WO2019029880A1 (fr) 2019-02-14

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Country Link
DE (1) DE102017213954A1 (fr)
WO (1) WO2019029880A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021112826A1 (fr) * 2019-12-03 2021-06-10 Cummins Emission Solutions Inc. Système de distribution de réducteur pour système de post-traitement de gaz d'échappement
US11828214B2 (en) 2020-05-08 2023-11-28 Cummins Emission Solutions Inc. Configurable aftertreatment systems including a housing
US11982219B2 (en) 2017-06-06 2024-05-14 Cummins Emission Solutions Inc. Systems and methods for mixing exhaust gases and reductant in an aftertreatment system

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2395211A1 (fr) * 2009-02-03 2011-12-14 Yanmar Co., Ltd. Appareil de purification d'échappement
WO2012008572A1 (fr) * 2010-07-16 2012-01-19 いすゞ自動車株式会社 Dispositif de purification de gaz d'échappement
DE112012000089T5 (de) * 2011-12-27 2013-09-12 Komatsu Ltd. Vorrichtung zum Mischen einer wässrigen Reduktionsmittellösung und Abgasnachbehandlungsvorrichtung
DE112012000035T5 (de) * 2011-12-27 2013-09-12 Komatsu Ltd. Vorrichtung zum Mischen einer wässrigen Reduktionsmittellösung und Abgasnachbehandlungsvorrichtung
DE202015102092U1 (de) * 2014-05-07 2015-08-11 Faurecia Systemes D'echappement Abgasreinigungsbaugruppe
US20150308316A1 (en) * 2014-04-29 2015-10-29 GM Global Technology Operations LLC Integrated mixing system for exhaust aftertreatment system
DE102015106876A1 (de) * 2014-05-07 2015-11-12 Faurecia Systemes D'echappement Abgasreinigungsbaugruppe und Abgasleitung mit einer solchen Baugruppe
DE102014208743A1 (de) 2014-05-09 2015-11-12 Robert Bosch Gmbh Einrichtung, Abgasnachbehandlungseinrichtung

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2395211A1 (fr) * 2009-02-03 2011-12-14 Yanmar Co., Ltd. Appareil de purification d'échappement
WO2012008572A1 (fr) * 2010-07-16 2012-01-19 いすゞ自動車株式会社 Dispositif de purification de gaz d'échappement
DE112012000089T5 (de) * 2011-12-27 2013-09-12 Komatsu Ltd. Vorrichtung zum Mischen einer wässrigen Reduktionsmittellösung und Abgasnachbehandlungsvorrichtung
DE112012000035T5 (de) * 2011-12-27 2013-09-12 Komatsu Ltd. Vorrichtung zum Mischen einer wässrigen Reduktionsmittellösung und Abgasnachbehandlungsvorrichtung
US20150308316A1 (en) * 2014-04-29 2015-10-29 GM Global Technology Operations LLC Integrated mixing system for exhaust aftertreatment system
DE202015102092U1 (de) * 2014-05-07 2015-08-11 Faurecia Systemes D'echappement Abgasreinigungsbaugruppe
DE102015106876A1 (de) * 2014-05-07 2015-11-12 Faurecia Systemes D'echappement Abgasreinigungsbaugruppe und Abgasleitung mit einer solchen Baugruppe
DE102014208743A1 (de) 2014-05-09 2015-11-12 Robert Bosch Gmbh Einrichtung, Abgasnachbehandlungseinrichtung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11982219B2 (en) 2017-06-06 2024-05-14 Cummins Emission Solutions Inc. Systems and methods for mixing exhaust gases and reductant in an aftertreatment system
WO2021112826A1 (fr) * 2019-12-03 2021-06-10 Cummins Emission Solutions Inc. Système de distribution de réducteur pour système de post-traitement de gaz d'échappement
US11828214B2 (en) 2020-05-08 2023-11-28 Cummins Emission Solutions Inc. Configurable aftertreatment systems including a housing

Also Published As

Publication number Publication date
DE102017213954A1 (de) 2019-02-14

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