EP1835139A2 - Procédé de fabrication d'un dispositif de mélange pour un dispositif de traitement des gaz d'échappement, dispositif de mélange pour un dispositif de traitement des gaz d'échappement tout comme agencement doté d'un tel dispositif de mélange - Google Patents

Procédé de fabrication d'un dispositif de mélange pour un dispositif de traitement des gaz d'échappement, dispositif de mélange pour un dispositif de traitement des gaz d'échappement tout comme agencement doté d'un tel dispositif de mélange Download PDF

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Publication number
EP1835139A2
EP1835139A2 EP07101246A EP07101246A EP1835139A2 EP 1835139 A2 EP1835139 A2 EP 1835139A2 EP 07101246 A EP07101246 A EP 07101246A EP 07101246 A EP07101246 A EP 07101246A EP 1835139 A2 EP1835139 A2 EP 1835139A2
Authority
EP
European Patent Office
Prior art keywords
mixing
mixing device
exhaust gas
elements
exhaust
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Withdrawn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
EP07101246A
Other languages
German (de)
English (en)
Other versions
EP1835139A3 (fr
Inventor
Rainer Haeberer
Matthias Horn
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.)
Robert Bosch GmbH
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 EP1835139A2 publication Critical patent/EP1835139A2/fr
Publication of EP1835139A3 publication Critical patent/EP1835139A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/4315—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being deformed flat pieces of material
    • 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
    • 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]

Definitions

  • the invention is based on a method for producing a mixing device for an exhaust aftertreatment device, a mixing device for an exhaust aftertreatment device and an arrangement with such a mixing device according to the preambles of the independent claims.
  • a method for selective catalytic reduction has proven to be advantageous for such internal combustion engines which are operated with excess air.
  • nitrogen oxides are converted together with ammonia in a selective catalyst to nitrogen and water.
  • the necessary for the catalytic conversion of nitrogen oxides reducing agent is carried instead of the ammonia in the form of an aqueous urea solution in a storage tank in the vehicle, from which the ammonia can be released by thermolysis and hydrolysis of the urea solution in the amount required in each case for the implementation. It is known to introduce the aqueous urea solution through a metering device in the reduction catalyst.
  • a so-called static mixer between the metering valve and the catalyst.
  • a mixer usually a ring member or a tube is provided, which are welded into the flaps.
  • At least one carrier element with at least one integrally attached mixing element is formed from a plate-shaped base material, wherein the mixing element and the carrier element are bent in accordance with their later intended use.
  • the production method according to the invention is characterized in particular by the fact that arbitrarily complicated mixing devices, even those with very compact constructions, can be produced particularly simply and with the required mechanical stability. Thus, the manufacturing costs can be reduced.
  • a plate-shaped base material for example, already serve a simple bending stamped part.
  • a flat sheet metal plate can be used, from which the at least one mixing element is singulated, for example punched or cut.
  • a plurality of mixing elements is singled, wherein the mixing elements are preferably formed tongue-shaped.
  • the mixing elements can be bent out of the plane of the plate-shaped base material, wherein an angle of up to 180 ° is formed between the mixing elements and the plane.
  • the mixing elements In the assembled final state, the mixing elements can be directed in the proposed angular range both in and against the flow direction, which leads to a particularly favorable turbulence.
  • the mixing elements can be twisted along their longitudinal axis, whereby advantageously additional turbulences can occur, which in turn leads to a particularly advantageous mixing of the fluids introduced into the mixing device and to be mixed.
  • the support member may be formed into a tube such that the mixing elements protrude inwardly into the flow channel forming an axially extending interface.
  • the mixing device produced according to the invention can be used in particular for an exhaust aftertreatment device, wherein exhaust gas with the vaporized aqueous urea solution or ammonia is mixed.
  • the mixing device is also suitable for any other application.
  • the mixing device is preferably inserted between the metering valve and the catalyst in an exhaust pipe.
  • the mixing device can be attached via a non-positive or positive connection in the exhaust pipe.
  • the mixing element is tongue-shaped.
  • a particularly favorable turbulence of an air flow or a uniform distribution with a further component can be achieved.
  • a region may be formed, on which a bead is arranged, wherein the region is preferably located in the angled region of the mixing elements.
  • the bead is conveniently formed centrally along longitudinal axes of the mixing elements and advantageously result in later operation to increased stability of the mixing device.
  • Recesses are preferably formed in the mixing element, which may be distributed in regions or over the entire surface of the mixing elements.
  • a favorable turbulence of the exhaust gas flow or the uniform distribution of a further component in the exhaust gas, for example in the form of the aqueous urea solution, can be advantageously achieved via the shaping of the preferred tongue-shaped mixing elements, via a twisting of the mixing elements and / or via additional recesses in the form of holes in the Mixed elements achieved or adjusted as needed.
  • a latching element may be formed on one side, which engages in a corresponding recess on the opposite side.
  • the mixing device in an exhaust aftertreatment device for the aftertreatment of exhaust gases of an internal combustion engine of a motor vehicle, is inserted into an exhaust pipe, that the locking element is in a frictional connection with the inside of the exhaust pipe.
  • the locking element can serve as a spring element which presses against the exhaust pipe at the seam of the mixing device from the inside and thus produces a non-positive connection between the mixing device and the exhaust pipe.
  • the tubular mixing device has an oval cross section and is thus brought into a self-locking against unintentional release connection with the exhaust pipe.
  • Fig. 1 shows a plan view of a plate-shaped base material, which is used as starting material for a method according to the invention for producing a mixing device according to the invention.
  • the mixing device 10 is preferably used for an exhaust gas aftertreatment device for after-treatment of exhaust gases of an internal combustion engine and used in an exhaust pipe, on the one hand to swirl the exhaust gas stream and on the other hand to mix the exhaust gas stream with other components, in particular with an aqueous urea solution.
  • the plate-shaped base material is formed as a simple bending stamped part made of sheet metal and comprises a carrier element 11 with integrally attached mixing elements 12.
  • the mixing elements 12 are preferably punched out of the plate-shaped base material and are formed, for example tongue-shaped. Both the mixing elements 12 and the carrier element 11 are then bent according to their later intended use.
  • the mixing elements 12 are first bent out of the plane of the plate-shaped base material, as shown in FIG. 2.
  • the bending of the mixing elements 12 takes place in one direction, ie in Fig. 1 down.
  • the mixing elements 12 are thereby bent at different angles ⁇ , ⁇ 'against the plane of the support member 11, wherein the angle ⁇ , ⁇ ' can be different depending on demand and can range from 0 ° to 180 °.
  • the individual mixing elements 12 are bent in this example in the final assembled state so that they are both in the flow direction 21 and against the flow direction 21.
  • the mixing elements 12 can be twisted along their longitudinal axis 13, which is not apparent from the figures.
  • a region 15 formed as a neck part is formed at a transition between the tongue-shaped mixing elements 12 and the carrier element 11, on each of which a bead 16 is arranged.
  • the bead 16 is formed centrally on the neck portion 15 and extends along the longitudinal axis 13 of the mixing elements 12.
  • the bead 16 serves to increase the stability.
  • a bead 16 may also be formed a recess. It can be formed on the mixing elements 12 and recesses in different sizes and arrangements in order to influence the flow characteristics as needed. The recesses are not shown in the figures.
  • the support member 11 is bent according to its intended use and thereby formed into a one-piece tube 14 that the mixing elements 12 depending on demand inwardly project into the future flow channel. This creates an axially extending seam 18 on the carrier element 11.
  • FIG. 5 shows a detailed view of the seam 18, wherein on one side a latching element 19 is formed, which engages in a corresponding recess 20 on the opposite side. This produces a stable latching connection at the seam 18.
  • a diameter of the tubular mixing device 10 can be adapted to the diameter of an exhaust pipe, not shown.
  • the diameter of the tubular mixing device 10 is slightly smaller than the diameter of the exhaust pipe, in which the mixing device 10 is to be used.
  • the seam 18 is secured tangentially through the inside of the exhaust pipe. If the locking element 19 protrudes slightly from the surface of the tube 14 to the outside, the locking element 19 acts as a spring element, whereby an additional protection against unintentional release of the tube 14 is made at the seam 18.
  • the locking element 19 is thus in a frictional connection with the inside of the exhaust pipe.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Dispersion Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
EP07101246A 2006-03-15 2007-01-26 Procédé de fabrication d'un dispositif de mélange pour un dispositif de traitement des gaz d'échappement, dispositif de mélange pour un dispositif de traitement des gaz d'échappement tout comme agencement doté d'un tel dispositif de mélange Withdrawn EP1835139A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006011890A DE102006011890A1 (de) 2006-03-15 2006-03-15 Verfahren zur Herstellung einer Mischvorrichtung für eine Abgasnachbehandlungsvorrichtung, Mischvorrichtung für eine Abgasnachbehandlungsvorrichtung sowie Anordnung mit einer solchen Mischvorrichtung

Publications (2)

Publication Number Publication Date
EP1835139A2 true EP1835139A2 (fr) 2007-09-19
EP1835139A3 EP1835139A3 (fr) 2009-04-08

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Family Applications (1)

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EP07101246A Withdrawn EP1835139A3 (fr) 2006-03-15 2007-01-26 Procédé de fabrication d'un dispositif de mélange pour un dispositif de traitement des gaz d'échappement, dispositif de mélange pour un dispositif de traitement des gaz d'échappement tout comme agencement doté d'un tel dispositif de mélange

Country Status (2)

Country Link
EP (1) EP1835139A3 (fr)
DE (1) DE102006011890A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1985356A3 (fr) * 2007-04-25 2009-03-18 J. Eberspächer GmbH & Co. KG Dispositif de mélange et/ou d'évaporation et procédé de fabrication correspondant
EP2006017A3 (fr) * 2007-06-18 2009-03-25 J. Eberspächer GmbH Co. KG Dispositif de mélange et/ou d'évaporation et procédé de fabrication correspondant
WO2010057508A1 (fr) * 2008-11-21 2010-05-27 Bayerische Motoren Werke Aktiengesellschaft Dispositif de mélange et/ou d'évaporation d'un agent de réduction et dispositif de mise en contact d'un flux de gaz d'échappement avec un agent de réduction

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007005497A1 (de) 2007-01-30 2008-07-31 J. Eberspächer GmbH & Co. KG Abgasanlage für eine Brennkraftmaschine
DE102008017395C5 (de) * 2008-04-05 2018-01-25 Eberspächer Exhaust Technology GmbH & Co. KG Misch- und/oder Verdampfungseinrichtung
DE102013223956A1 (de) 2013-11-22 2015-05-28 Robert Bosch Gmbh Einrichtung zur Abgasnachbehandlung
DE102014208743A1 (de) 2014-05-09 2015-11-12 Robert Bosch Gmbh Einrichtung, Abgasnachbehandlungseinrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4899812A (en) * 1988-09-06 1990-02-13 Westinghouse Electric Corp. Self-securing turbulence promoter to enhance heat transfer
WO1990010497A1 (fr) * 1989-03-09 1990-09-20 Gebrüder Sulzer Aktiengesellschaft Garniture a passages multiples pour la generation de tourbillons
US5407607A (en) * 1993-11-09 1995-04-18 Mix; Thomas W. Structured packing elements
GB2381218A (en) * 2001-10-25 2003-04-30 Eminox Ltd Gas treatment apparatus
EP1493485A1 (fr) * 2003-05-08 2005-01-05 Sulzer Chemtech AG Mélangeur statique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4899812A (en) * 1988-09-06 1990-02-13 Westinghouse Electric Corp. Self-securing turbulence promoter to enhance heat transfer
WO1990010497A1 (fr) * 1989-03-09 1990-09-20 Gebrüder Sulzer Aktiengesellschaft Garniture a passages multiples pour la generation de tourbillons
US5407607A (en) * 1993-11-09 1995-04-18 Mix; Thomas W. Structured packing elements
GB2381218A (en) * 2001-10-25 2003-04-30 Eminox Ltd Gas treatment apparatus
EP1493485A1 (fr) * 2003-05-08 2005-01-05 Sulzer Chemtech AG Mélangeur statique

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1985356A3 (fr) * 2007-04-25 2009-03-18 J. Eberspächer GmbH & Co. KG Dispositif de mélange et/ou d'évaporation et procédé de fabrication correspondant
US8495866B2 (en) 2007-04-25 2013-07-30 J. Eberspaecher Gmbh & Co., Kg Mixing and/or evaporation device and respective manufacturing method
EP2006017A3 (fr) * 2007-06-18 2009-03-25 J. Eberspächer GmbH Co. KG Dispositif de mélange et/ou d'évaporation et procédé de fabrication correspondant
US8302391B2 (en) 2007-06-18 2012-11-06 J. Eberspächer GmbH & Co. KG Mixing and/or evaporating device and process for manufacturing same
WO2010057508A1 (fr) * 2008-11-21 2010-05-27 Bayerische Motoren Werke Aktiengesellschaft Dispositif de mélange et/ou d'évaporation d'un agent de réduction et dispositif de mise en contact d'un flux de gaz d'échappement avec un agent de réduction

Also Published As

Publication number Publication date
EP1835139A3 (fr) 2009-04-08
DE102006011890A1 (de) 2007-09-20

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