EP3303786A1 - Mélangeur dans un système d'échappement - Google Patents

Mélangeur dans un système d'échappement

Info

Publication number
EP3303786A1
EP3303786A1 EP16726854.9A EP16726854A EP3303786A1 EP 3303786 A1 EP3303786 A1 EP 3303786A1 EP 16726854 A EP16726854 A EP 16726854A EP 3303786 A1 EP3303786 A1 EP 3303786A1
Authority
EP
European Patent Office
Prior art keywords
mixer
housing
central axis
downstream
inlet opening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16726854.9A
Other languages
German (de)
English (en)
Inventor
Tobias INCLÁN
Thomas Kremer
Eric Hein
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tenneco GmbH
Original Assignee
Tenneco 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 Tenneco GmbH filed Critical Tenneco GmbH
Publication of EP3303786A1 publication Critical patent/EP3303786A1/fr
Withdrawn legal-status Critical Current

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
    • F01N3/08—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
    • F01N2470/02—Tubes being perforated
    • F01N2470/04—Tubes being perforated characterised by shape, disposition or dimensions of apertures
    • 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
    • F01N2470/18—Structure or shape of gas passages, pipes or tubes the axis of inlet or outlet tubes being other than the longitudinal axis of 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
    • F01N2610/00—Adding substances to exhaust gases
    • 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 static mixer for use in an exhaust system of an internal combustion engine and for the mixing of an additive injected in an exhaust system and a system consisting of a mixer and at least one housing part of a first converter of an exhaust system.
  • the mixer is formed of a tubular housing surrounding a central axis X.
  • the housing has an inlet opening in the direction of the center axis X and an outlet opening at the end, the inlet opening serving to receive injected additive.
  • the housing is closed in the region of the inlet opening and in the region of the outlet opening in the circumferential direction about the central axis X, that is, regardless of a possible perforation in the circumferential closed edge, the edge is closed.
  • an exhaust system with a longitudinal axis having overflow pipe which has certain properties of a static mixer.
  • This overflow tube has a lateral surface and a first, flow-tight end, wherein in the lateral surface adjacent to the flow-tight end, a radially arranged inflow opening is provided.
  • the overflow pipe is received with its flow-tight end and the inflow opening in a first exhaust pipe element.
  • the reducing agent injected by an injector unit can be injected into the first exhaust gas conduit element.
  • DE 10 2011 120 685 A1 describes an exhaust system for a vehicle with an inlet, via which a reducing agent for the exhaust aftertreatment can be introduced into the exhaust gas by means of an injector, wherein downstream of the inlet arranged for mixing the reducing agent with the exhaust mixing device is.
  • DE 11 2012 000 035 T5 describes an apparatus for mixing an aqueous reducing agent solution for adding an aqueous reducing agent solution to an exhaust gas, wherein the device for mixing an aqueous reducing agent solution between a filter capturing particulate substances contained in the exhaust gas, and a reduction catalyst that reduces and processes nitrogen oxide in the exhaust gas.
  • the object of the invention is to design and arrange a static mixer in such a way that it generates little back pressure, ensures rapid and complete reduction agent preparation and at the same time is insensitive to manufacturing tolerances.
  • the housing forms a tube segment upstream of the XY plane, which oriented several in the radial direction to the center axis X.
  • Having openings as a perforation and downstream or in the main flow direction S behind the XY plane forms a tube segment having a recess in which a plurality of baffles are arranged.
  • the perforation in the part in the tube of the mixer which is directed towards the exhaust flow and located upstream of the XY plane, reduces the counterpressure of the mixer.
  • baffles are inserted into the housing. Above and below the recess, the housing has a closed edge in the circumferential direction about the central axis X. - -
  • Additive may be added in liquid and / or gaseous form to the mixer according to the invention.
  • the axial direction and the radial direction as well as the circumferential direction refer to the center axis X of the mixer, unless otherwise specified.
  • baffles are arranged at a distance ax in the axial direction one behind the other and in the radial direction at a distance az offset from each other.
  • the radial direction corresponds to a direction Z, at right angles to the XY plane.
  • This step-shaped arrangement also prefers simple manufacturing tolerances because each baffle can be used individually.
  • the baffles cover the flow cross-section of the downstream tube segment between 80% and 100%.
  • baffles may also be advantageous due to the thermo-mechanical loading of the baffles when the baffles are not formed exclusively of flat and straight pieces of sheet metal, but also or alternatively of wave-shaped and / or bent sheet metal pieces, which are inserted into the housing and materially connected to the housing.
  • the cohesive connection prevents the baffles of the baffles in the exhaust stream.
  • a wavy and / or angled shape is advantageous for the compensation of temperature-induced changes in length of the baffles.
  • the baffles are arranged parallel to each other and at right angles to the central axis X or at right angles to an injection direction.
  • an injection direction runs parallel to the central axis X.
  • an injection direction is not parallel to the center line - -
  • the baffles may be aligned either at right angles to the central axis X or at right angles to the direction of injection.
  • a low back pressure it may be, if further openings are provided in the downstream tube segment adjacent to the recess, which form a perforation.
  • the perforation is provided in the area where the housing or the edge of the housing is closed.
  • the backpressure in the upstream pipe segment and through the perforation in the downstream pipe segment can reduce the backpressure which is generated by the mixer in the exhaust gas flow.
  • the housing has a constant housing cross-section Q2 in the axial direction at least in the area of the perforation and downstream of the perforation.
  • a tubular housing is simple and inexpensive to manufacture.
  • the inlet opening has a flow cross-section which is equal to or smaller than the flow cross-section of the outlet opening. This creates similar properties to a tube.
  • the ratios of the two openings at the input and the output to each other may also be larger or smaller. It can be provided that the housing has a conical shape.
  • a system consisting of a mixer and at least one housing part of a first converter or filter of an exhaust system with a longitudinal axis, wherein the housing part designed as a hood forms a flow channel in which the mixer is arranged and at least partially leads around the mixer. Due to the inventive flow through the pipe wall through the perforation and the recess, the structure of the mixer permits an arrangement in an end section or in a hood of a converter or filter. The use in an end section is so - -
  • the hood forms a tapered flow channel from the converter or filter to the exhaust pipe.
  • a system may be advantageous in which upstream of the mixer, a first converter or filter is arranged with a housing, wherein the housing of the converter or filter is connected to the housing of the mixer medium or directly.
  • the mixer and the housing of the converter or filter form an assembly in which the central axis X is advantageously arranged at an angle ⁇ between 75 ° and 90 ° with respect to the longitudinal axis of the first converter.
  • the mixer downstream of the perforation forms an exhaust pipe or is accommodated in a separate tube.
  • the flow direction in the mixer extends at an angle approximately between 75 ° and 90 ° to the main flow direction S. Due to the cylindrical design, the mixer can serve in its extension as an exhaust pipe.
  • the serving as an exhaust pipe part has neither perforations nor other recesses.
  • a separate tube would be provided in addition to the housing part and fixed to the housing part.
  • the mixer when the mixer is connected via the exhaust pipe or pipe downstream with another converter or filter in which acts the introduced reducing agent.
  • an injector unit for an additive is provided in the axial direction immediately in front of the inlet opening, the injection direction is aligned coaxially to the central axis X or at an angle between 5 ° and 90 ° to the central axis X or the additive through the inlet opening of the Mischers can be introduced.
  • Figure 1 is a schematic diagram of a housing for a mixer and its
  • Figure 2 is a perspective view of a mixer on the XZ plane with subsequent exhaust pipe and attached injector unit;
  • Figure 3 is a plan view of a sectional view of a mixer according to FIG.
  • Figure 4 is a perspective view of a mixer on the XY plane without
  • Figure 5 is a schematic diagram of a system consisting of a mixer according to Figure 2, a housing part, a DPF and a DOC;
  • FIG. 6 shows a first perspective view of the mixer with housing part according to FIG. 5;
  • FIG. 7 shows a second perspective view of the mixer with housing part according to FIG. 5.
  • the mixer 1 has certain physical characteristics relative to a Cartesian coordinate system XYZ.
  • the one-piece housing 2 of the mixer 1 extends along a central axis X with a peripheral in a YZ plane lateral surface which is divided into two tube segments 21, 22. Both pipe segments 21, 22 are essentially - -
  • the housing 2 has a radius r2, which is constant over the entire length L2 of the housing 2 according to this embodiment.
  • the result of this constant radius r2 is that an inlet opening 31 and an outlet opening 32, which are arranged opposite one another in the direction of the central axis X, have a flow cross-section S31, S32 identical to the housing cross-section Q2.
  • FIG. 2 shows a perspective view of a mixer 1, formed from the housing 2.
  • the housing 2 has, in the region of the tube segment 22, a recess 5, which partially runs around the entire tube segment 22.
  • a plurality of baffles 51 are arranged in the region of the recess 5, which run parallel to each other in the direction of the Y-axis.
  • the guide plates 51 are arranged offset in the direction of the central axis X by a distance ax and in the direction of the Z axis by a distance az to each other.
  • the arrangement and geometry, in particular with respect to the segmentation of the housing 2 in the two pipe segments 21, 22 and the baffles 51 is shown schematically in Fig.
  • openings 4 are provided in the form of a perforation, through which an exhaust gas stream can flow into the housing 2.
  • an injector unit 9 is placed on the housing 2, through which an additive can be injected into the exhaust gas stream.
  • the housing 2 is extended by an exhaust pipe 11. - -
  • FIG. 5 shows a system consisting of a mixer 1, which is extended by an exhaust pipe 11 and accommodated in a housing part 61.
  • An exhaust gas stream flows through a converter 6 formed as a catalyst in this embodiment into the flow channel 62 formed by the housing part 61.
  • the housing part 61 encloses the mixer 1 in such a way that the mixer shears in the direction of the central axis X at two positions P1, P2 in FIG Housing part 61 is mounted.
  • the housing part 61 forms two flow channels 62, which lead around the mixer 1.
  • the exhaust gas stream in the flow channel 62 is led into the mixer 1 as well as guided around the mixer 1 via the flow channel 62.
  • the exhaust gas stream guided around the mixer 1 between the housing part 61 and the mixer 1 through the flow channels 62 is shown with a dashed arrow in FIG.
  • the exhaust gas flowing through the openings 4 into the mixer 1 mixes with the exhaust gas, which first flows around the mixer 1 and also through the recess 5 into the mixer 1.
  • the exhaust stream located in the mixer 1 is mixed with the injected additive.
  • the entire exhaust stream flows out of the mixer 1 after merging and mixing from the outlet port 32 and into the exhaust pipe 11.
  • the exhaust gas flow flows through a converter 8 designed as a particle filter in this embodiment with a longitudinal axis L8.
  • the exhaust gas flow is deflected by an angle ⁇ between 140 ° and 160 ° degrees.
  • a first deflection takes place due to the arrangement of the central axis X to the longitudinal axis L6 of the converter 6, which are inclined at an angle of 110 ° to each other.

Landscapes

  • 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 mélangeur statique (1) destiné à être utilisé dans une installation d'échappement d'un moteur à combustion interne et pour le mélange d'un additif injecté dans l'installation d'échappement. Le mélangeur (1) est formé à partir d'un boîtier (2) tubulaire s'étendant autour d'un axe médian X. Le boîtier (2) comprend, dans la direction de l'axe médian X, une ouverture d'entrée (31) du côté de l'une de ses extrémités et une ouverture de sortie (32) du côté de l'extrémité opposée, l'ouverture d'entrée (31) servant à recevoir de l'additif injecté dans l'installation d'échappement. Le boîtier (2) est, dans la région de l'ouverture d'entrée (31) et dans la région de l'ouverture de sortie (32), fermé par un bord autour de l'axe médian X dans la direction périphérique. Le mélangeur statique (1) doit générer peu de contre-pression, garantir un traitement rapide et complet de l'agent de réduction et simultanément être insensible aux tolérances de fabrication. À cet effet, le boîtier (2) forme, par rapport à un plan XY orienté parallèlement à l'axe médian X du mélangeur (1) et perpendiculairement à une direction d'écoulement principal S, en amont du plan XY, un segment tubulaire (21) qui comprend plusieurs ouvertures (4) orientées dans la direction radiale par rapport à l'axe médian X en tant que perforations et, en aval du plan XY, un segment tubulaire (22) qui comprend un évidement (5) dans lequel sont disposées plusieurs tôles déflectrices (51).
EP16726854.9A 2015-06-01 2016-05-30 Mélangeur dans un système d'échappement Withdrawn EP3303786A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015108655.7A DE102015108655B4 (de) 2015-06-01 2015-06-01 Mischer
PCT/EP2016/062180 WO2016193221A1 (fr) 2015-06-01 2016-05-30 Mélangeur dans un système d'échappement

Publications (1)

Publication Number Publication Date
EP3303786A1 true EP3303786A1 (fr) 2018-04-11

Family

ID=56098238

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16726854.9A Withdrawn EP3303786A1 (fr) 2015-06-01 2016-05-30 Mélangeur dans un système d'échappement

Country Status (5)

Country Link
US (1) US10480372B2 (fr)
EP (1) EP3303786A1 (fr)
CN (1) CN107709718B (fr)
DE (1) DE102015108655B4 (fr)
WO (1) WO2016193221A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10137421B2 (en) * 2015-11-12 2018-11-27 Doosan Heavy Industries Construction Co., Ltd. Static mixer
US10787946B2 (en) 2018-09-19 2020-09-29 Faurecia Emissions Control Technologies, Usa, Llc Heated dosing mixer
DE102019109983A1 (de) * 2019-04-16 2020-10-22 Eberspächer Exhaust Technology GmbH & Co. KG Mischer
WO2021010964A1 (fr) * 2019-07-15 2021-01-21 Cummins Emission Solutions Inc. Systèmes et procédés pour délivrer un écoulement de gaz d'échappement uniforme à un composant de post-traitement
EP3812557B1 (fr) * 2019-10-22 2023-01-25 Purem GmbH Mélangeur

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202007010324U1 (de) 2007-07-25 2008-11-27 Heinrich Gillet Gmbh Vorrichtung zum Nachbehandeln der Abgase von Dieselmotoren
DE102011120685A1 (de) * 2011-12-09 2012-07-05 Daimler Ag Abgasstrang für ein Fahrzeug
JP5349574B2 (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
DE102012209087A1 (de) * 2012-05-30 2013-12-05 Robert Bosch Gmbh Vorrichtung zum Einbringen einer Flüssigkeit in einen Abgasstrang einer Brennkraftmaschine
DE102012021017A1 (de) 2012-10-26 2014-04-30 Daimler Ag Abgassystem
US9289724B2 (en) 2013-05-07 2016-03-22 Tenneco Automotive Operating Company Inc. Flow reversing exhaust gas mixer
US9435240B2 (en) 2013-08-06 2016-09-06 Tenneco Automotive Operating Company Inc. Perforated mixing pipe with swirler

Also Published As

Publication number Publication date
WO2016193221A1 (fr) 2016-12-08
CN107709718B (zh) 2019-09-10
DE102015108655B4 (de) 2017-07-13
US20180156092A1 (en) 2018-06-07
US10480372B2 (en) 2019-11-19
CN107709718A (zh) 2018-02-16
DE102015108655A1 (de) 2016-12-01

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