EP1204816A1 - Element melangeur pour un fluide guide dans un tuyau - Google Patents

Element melangeur pour un fluide guide dans un tuyau

Info

Publication number
EP1204816A1
EP1204816A1 EP00951497A EP00951497A EP1204816A1 EP 1204816 A1 EP1204816 A1 EP 1204816A1 EP 00951497 A EP00951497 A EP 00951497A EP 00951497 A EP00951497 A EP 00951497A EP 1204816 A1 EP1204816 A1 EP 1204816A1
Authority
EP
European Patent Office
Prior art keywords
mixing element
guide surface
tube
flow
pipe
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Withdrawn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
EP00951497A
Other languages
German (de)
English (en)
Inventor
Rolf BRÜCK
Katrin Schaper
Jan Hodgson
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.)
Vitesco Technologies Lohmar Verwaltungs GmbH
Original Assignee
Emitec Gesellschaft fuer Emissionstechnologie mbH
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 Emitec Gesellschaft fuer Emissionstechnologie mbH filed Critical Emitec Gesellschaft fuer Emissionstechnologie mbH
Publication of EP1204816A1 publication Critical patent/EP1204816A1/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Withdrawn legal-status Critical Current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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • 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
    • 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
    • B01F25/43151—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being deformed flat pieces of material composed of consecutive sections of deformed flat pieces of material
    • 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
    • B01F25/4317—Profiled elements, e.g. profiled blades, bars, pillars, columns or chevrons
    • 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

Definitions

  • the present invention relates to a mixing element for a fluid guided in a pipe and a pipe, in particular an exhaust pipe of a motor vehicle, in which at least one such mixing element is installed.
  • Hot fluids guided in pipes for example the exhaust gas of an internal combustion engine, which are fed to a device, for example a three-way catalytic converter or a so-called NO ⁇ store, usually have an external flow cooled by the outer surface of the pipe and thus viewed over the flow cross section an inhomogeneous temperature distribution.
  • mixing elements in a tube, which in a cross-sectional plane of the tube either "peel" parts of the cooler external flow from the inner surface of the tube and guide them inward (also referred to below as the outer guide surface) or parts of the hotter internal flow to the outside (hereinafter also referred to as the inner guide surface).
  • the mixing elements are arranged inclined to a main flow direction. Therefore, and because of their series arrangement, a pair of known mixing elements requires a relatively long flow path for the mixing.
  • the outer guide surfaces have the disadvantage that, in the flow shadow behind the outer guide surfaces, a considerable part of the inner surface of the tube is hardly flowed through and is therefore eliminated for the heat exchange desired in most applications. This compensates for the cooling almost the advantage that the mixing of the inner and outer currents otherwise brings.
  • the use of the entire inner surface of the tube for cooling should essentially be ensured.
  • the fluid after flowing through the mixing element, the fluid should have a temperature distribution as uniform as possible over the flow cross-section, for example to avoid thermally induced local damage to a downstream device or premature aging.
  • the mixing element should be characterized by the possibility of its automatic production and compact design.
  • Another object of the invention is to provide a tube in which at least one such mixing element is installed.
  • the mixing element according to the invention for a fluid guided in a tube is characterized in that means are present in approximately a cross-sectional plane of the tube, by means of which parts of the external flow adjacent to the inner surface of the tube are simultaneously directed inwards and parts of the internal flow to the outside, which advantageously mixes hot and cooler flows with one another in such a way that there is an overall flow with a temperature distribution which is as homogeneous as possible and thermal damage to a downstream device is avoided.
  • Another advantage is that the mixing element according to the invention compared to the known mixing elements arranged in series as described above requires a significantly shorter flow path for the mixing of the external and internal flows of a fluid.
  • the mixing element preferably has at least one outer guide surface for deflecting the outer flow inwards and at least one inner guide surface for deflecting the inner flow outwards.
  • outer and inner guide surfaces inclined to the main flow direction.
  • the greater the inclination towards the main flow direction the greater the pressure loss but also the mixing.
  • the angle of inclination of the guide surfaces can therefore be adjusted depending on the flow conditions. They can also be different in the case of inner and outer guide surfaces, in particular if the total areas of the inner and outer guide surfaces are also different.
  • outer and inner guide surfaces be held on a common holding frame.
  • the holding frame is designed to be at least quadrangular, preferably hexagonal or as another polygon with an even number of corners.
  • the outer guide surface is preferably at least partially adapted to the contour of the inner surface of the tube, so that parts of an edge flow are advantageously “peeled off” from the inner surface of the tube and directed inwards.
  • the outer guide surface has at least one opening through which part of the outer flow continues to flow. This means that the part of the pipe surface directly behind an outer guide surface can also contribute to heat exchange.
  • the size of the opening should preferably be about 20 to 40% of the outer guide surface.
  • the opening is preferably designed as a circle segment open to the inner surface of the tube, so that the use of the entire tube surface for cooling is advantageously essentially ensured.
  • This circle segment can be cut out completely.
  • the segment used to form the opening is not completely cut off, but is only bent outward in the form of a tab connected to the mixing element, where it can serve for fastening to the inner surface of the tube.
  • the inner flow directed from the inside to the outside also gets a swirl in the circumferential direction, so that hot flows are again directed from the inside into the flow shadows behind the outer guide surfaces. It is therefore proposed to design the inner guide surfaces as swirl vanes.
  • the mixing element is preferably connected to the tube by joining technology, in particular welded or soldered, via the outer guide surfaces or the tabs bent outward therefrom.
  • the mixing element is preferably stamped from a sheet metal part or can be produced in one piece with a laser cut, which advantageously enables inexpensive automatic production.
  • the mixing element is at least partially coated. Coating the mixing element has the advantage that it ensures that the mixing element can withstand the thermal and dynamic loads that occur over a very long period of time. Furthermore, for example, a partial coating supports the formation of a joining connection of the mixing element with the pipe.
  • the pipe according to the invention in particular the exhaust pipe of a motor vehicle, is characterized in that at least one mixing element according to one of claims 1 to 16 is installed.
  • the arrangement according to the invention has at least the advantages of a largely homogeneous temperature distribution in the fluid after mixing the inner and outer flows and a small axial space requirement due to the reduced flow distance of the mixing element according to the invention.
  • the degree of mixing can advantageously be increased somewhat further if a second mixing element is arranged in the main flow direction in the tube behind the first mixing element in such a way that its inner or outer guide surfaces are offset from the inner or outer guide surfaces of the first mixing element.
  • a second mixing element is arranged in the main flow direction in the tube behind the first mixing element in such a way that its inner or outer guide surfaces are offset from the inner or outer guide surfaces of the first mixing element.
  • FIG. 1 is a side view of an inventive mixing element installed in an exhaust pipe of an internal combustion engine
  • FIG. 2 shows the mixing element according to the invention according to FIG. 1 in a front view
  • FIG 3 is a schematic development of the mixing element according to the invention according to Figures 1 and 2.
  • Fig. 4 is a swirl wing formed inner guide surface of the mixing element according to the invention in front view
  • Fig. 5 in the longitudinal axial section or partially in side view of a tube with two mixing elements according to the invention in series.
  • a mixing element 1 shows a side view of a mixing element 1 according to the invention installed in a pipe 2, for example an exhaust pipe of an internal combustion engine, not shown. Exhaust gas from an internal combustion engine (not shown) enters the exhaust pipe 2, in which the mixing element 1 is arranged such that parts of the outer surface adjacent to the inner surface 3 of the pipe 2 are simultaneously in approximately one plane Flow A is directed inwards and parts of the inner flow I outwards.
  • the mixing element 1 has three outer 4 and inner 5 guide surfaces, wherein, as is particularly clear from FIGS. 2 and 3, the outer guide surfaces 4 are trapezoidal and the inner guide surfaces 5 are triangular.
  • the outer guide surfaces 4 serve to deflect external flows A inwards; the inner guide surfaces 5 of the deflection of internal flows I to the outside.
  • outer 4 and inner 5 guide surfaces have an inclination to the main flow direction S, which in the mixing element 1 according to the exemplary embodiment for the outer guide surface 4 against the main flow direction S is approximately 45 ° and for the inner guide surface 5 in the main flow direction S is approximately 60 °.
  • Outer 4 and inner 5 guide surfaces are held on a common holding frame 6, which is preferably hexagonal in the mixing element 1 according to the exemplary embodiment.
  • the outer 4 and inner 5 guide surfaces are alternately arranged on the circumference of the holding frame 6 which lies completely within the flow cross-section and runs essentially in a flow-favorable manner parallel to the main flow direction S.
  • the sum of the areas of the outer guide surfaces 4 preferably corresponds approximately to the sum of the area of the inner guide surfaces 5, so that approximately equal proportions of external flows A are directed inwards and internal flows I are directed outwards.
  • the outer guide surface 4 preferably has at least one opening 7 through which part of the external flow continues to flow.
  • the opening 7 is designed as an approximately semicircular circle segment which is open to the inner surface 3 of the tube 2.
  • the outer guide surface 4 can have through holes (not shown) through which parts of the outer flow can also continue to flow.
  • the circle segment 9 to be removed to form the opening 7 can, as indicated in FIG. 3, also be incompletely separated from the guide surface 4 and bent outward along a bending line 10.
  • the internal flow I directed from the inside to the outside also gets a swirl in the circumferential direction, so that hot flow I from the inside is directed again in the flow shadow behind the outer guide surfaces 4 becomes. It is therefore advantageous if the inner guide surfaces 5 are designed as so-called swirl vanes, as is shown schematically in FIG. 4.
  • the mixing element 1 according to the embodiment of the invention is advantageously stamped from a sheet metal part or can be produced in one piece with a laser cut.
  • a corresponding development of the mixing element according to the invention is shown schematically in FIG. 3.
  • the mixing element can also be made from other materials, in particular correspondingly suitable plastics his. Manufacturing or cutting, stamping and forming, in particular deep drawing, injection molding and similar processes are used.
  • the outer 4 or inner 5 guide surfaces can first be reached to the desired one using known forming techniques, in particular by means of suitable presses Bend or bend the inclination and then form the corner shape of the frame, which ultimately only requires a joining connection, for example a weld, on its abutting sides 8.
  • Mixing elements 1 according to the invention that can be mass-produced at low cost are preferably suitable for installation in an exhaust pipe 2 of a motor vehicle, in particular in front of a honeycomb body, in particular a honeycomb body coated with catalytically active and / or acting as an adsorber.
  • a honeycomb body installed at the beginning, which guides the exhaust gas in a laminar flow for a long distance, in particular essentially without heat exchange from the outside in and vice versa
  • pipes according to the invention with one or more mixing elements 1 advantageously have a stronger cooling effect with lower pressure losses.
  • a second mixing element 1 ' can be arranged in the main flow direction S in the exhaust pipe 2 behind the first mixing element 1. It has proven to be advantageous to arrange the second mixing element 1 'in such a way that its outer 5' or inner 4 'guide surfaces are offset from the outer 5 or inner 4 guide surfaces of the first mixing element 1.
  • the teaching according to the invention is not limited to the area of exhaust technology shown in the exemplary embodiment. Rather, according to the invention Mixing elements 1, 1 'can be used wherever fluids guided in a pipe 2 are cooled or heated uniformly and / or should have a temperature distribution that is as homogeneous as possible, in particular in order to thermally cause local damage to a downstream device, in particular a NO ⁇ - To avoid memory.

Landscapes

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

Abstract

La présente invention concerne un élément mélangeur (1) pour un fluide qui est guidé dans un tuyau (2), notamment un élément mélangeur utilisé dans un tuyau d'échappement d'un moteur à combustion interne. Dans un plan approximativement commun et de façon simultanée, des parties du courant extérieur A, qui est adjacent à la surface interne (3) du tuyau (2), sont guidées vers l'intérieur au moyen d'une surface conductrice extérieure (4) et des parties du courant intérieur I sont guidées vers l'extérieur au moyen d'une surface conductrice intérieure (5). L'utilisation de la totalité de la surface intérieure (3) du tuyau (2) pour le refroidissement est de préférence assurée par au moins une ouverture (7) pourvue dans la surface conductrice extérieure (4). Cette invention fournit un moyen simple d'obtenir une répartition de température homogène et un bon refroidissement d'un fluide qui est guidé dans un tuyau (2). L'élément mélangeur (1) selon cette invention se distingue notamment des éléments mélangeurs connus par sa construction compacte.
EP00951497A 1999-08-17 2000-08-11 Element melangeur pour un fluide guide dans un tuyau Withdrawn EP1204816A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19938840A DE19938840A1 (de) 1999-08-17 1999-08-17 Mischelement für ein in einem Rohr geführtes Fluid
DE19938840 1999-08-17
PCT/EP2000/007831 WO2001012960A1 (fr) 1999-08-17 2000-08-11 Element melangeur pour un fluide guide dans un tuyau

Publications (1)

Publication Number Publication Date
EP1204816A1 true EP1204816A1 (fr) 2002-05-15

Family

ID=7918580

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00951497A Withdrawn EP1204816A1 (fr) 1999-08-17 2000-08-11 Element melangeur pour un fluide guide dans un tuyau

Country Status (7)

Country Link
US (1) US20020110047A1 (fr)
EP (1) EP1204816A1 (fr)
JP (1) JP2003507688A (fr)
CN (1) CN1148511C (fr)
AU (1) AU6441300A (fr)
DE (1) DE19938840A1 (fr)
WO (1) WO2001012960A1 (fr)

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Also Published As

Publication number Publication date
CN1370255A (zh) 2002-09-18
JP2003507688A (ja) 2003-02-25
WO2001012960A1 (fr) 2001-02-22
CN1148511C (zh) 2004-05-05
AU6441300A (en) 2001-03-13
DE19938840A1 (de) 2001-03-15
US20020110047A1 (en) 2002-08-15

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