FR2807336A1 - Static mixer with open or closed outer casing includes inclined perforated baffles covering entire flow cross section, with flow-arrestors at each end - Google Patents

Static mixer with open or closed outer casing includes inclined perforated baffles covering entire flow cross section, with flow-arrestors at each end Download PDF

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Publication number
FR2807336A1
FR2807336A1 FR0004476A FR0004476A FR2807336A1 FR 2807336 A1 FR2807336 A1 FR 2807336A1 FR 0004476 A FR0004476 A FR 0004476A FR 0004476 A FR0004476 A FR 0004476A FR 2807336 A1 FR2807336 A1 FR 2807336A1
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FR
France
Prior art keywords
static mixer
section
flow
open
arrestors
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Granted
Application number
FR0004476A
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French (fr)
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FR2807336B1 (en
Inventor
Basile Bekakis
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POUR LE DEV de l ANTIPOLLUTION
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POUR LE DEV de l ANTIPOLLUTION
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Priority to FR0004476A priority Critical patent/FR2807336B1/en
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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
    • B01F25/4316—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod
    • B01F25/43161—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod composed of consecutive sections of 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
    • 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
    • B01F25/4316—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod
    • 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
    • B01F25/45—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
    • B01F25/452—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces
    • B01F25/4521—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces the components being pressed through orifices in elements, e.g. flat plates or cylinders, which obstruct the whole diameter of the tube

Abstract

Planar, perforated flow deflector (or baffle) surfaces (D2) each occupy the full cross section of the casing (E2). They are inclined with respect to the principal axis of flow. Each baffle has one peripheral flow-arrestor (R2) at each of its ends.

Description

<U>Mélangeur statique</U>. L'invention concerne un mélangeur statique se composant d'une enveloppe dans laquelle est disposé au moins un étage de mélange. Divers types d'éléments de mélangeurs statiques sont connus à ce jour ; par exemple FR-A-2468401 décrit un mélangeur statique dans lequel les éléments de mélange sont constitués par des barrettes juxtaposées qui s'interpénètrent ; FR-A-2372652 décrit un procédé de soudage entre elles des barrettes dont les champs coïncident ; US-A-4929088 montre un mélangeur statique avec des déflecteurs pleins placés en périphérie de l'enveloppe ; EP-A-0655275 montre une structure échancrée continue pouvant avoir des parties saillantes. Ces mélangeurs statiques sont de fabrication compliquée et onéreuse, ont une action de mélange souvent insuffisante et sont encombrants. <U> Static mixer </U>. The invention relates to a static mixer consisting of an envelope in which at least one mixing stage is arranged. Various types of static mixer elements are known to date; for example FR-A-2468401 describes a static mixer in which the mixing elements consist of juxtaposed bars which interpenetrate; FR-A-2372652 describes a method of welding between them bars whose fields coincide; US-A-4929088 shows a static mixer with solid deflectors placed at the periphery of the envelope; EP-A-0655275 shows a continuous scalloped structure which may have projecting parts. These static mixers are complicated and expensive to manufacture, have an often insufficient mixing action and are bulky.

L'invention a pour but de fournir un mélangeur constitué d'éléments découpés plans dont la géométrie garantit l'homogénéité requise et assemblés de façon à garantir l'intégrité mécanique nécessaire pour résister aux applications mettant en oeuvre fluides très visqueux, facilement réalisable notamment avec les moyens modernes de découpe laser. A cet effet, le mélangeur statique selon l'invention est caractérisé en ce qu'il comprend au moins deux surfaces déflectrices planes ajourées disposées en oblique par rapport à l'axe d'écoulement principal, au moins l'une desdites surfaces s'inscrivant dans toute la section de passage. La forme de ces surfaces découle de 'enveloppe dans laquelle elles s'inscrivent. Par exemple, dans le cas d'une enveloppe à section carrée ou rectangulaire ces surfaces ajourées constituant l'élément de mélange seront elles-mêmes carrées ou rectangulaires. Dans le cas d enveloppe circulaire, les surfaces ajourées seront forme elliptique ou de fraction d'ellipse. Elles peuvent également s'interpénétrer suivant le pas à respecter pour obtenir l'homogénéité nécessaire. En effet, l'expérience a montré la disposition relative des surfaces déflectrices ajourées, la forme des ouvertures et le pourcentage du vide ainsi créé sont des critères importants à respecter pour répondre à l'intérêt des mélangeurs statiques qui réside dans l'obtention d'un mélange efficace, sur une faible longueur de traitement avec une perte de pression compatible avec 'application. Par ailleurs, ce nouveau type de mélangeur étant réalisé à partir de surface plantes découpées, ses coûts de fabrication sont réduits et sa construction extrêmement robuste. Selon les particularités essentielles de l'invention, les surfaces déflectrices sont découpées de façon à - présenter des lumières créant le pourcentage de vide désiré - être de structure homogène, c'est-à-dire ne comportant pas d'élément rapporté - venir en contact avec l'enveloppe sur tout ou partie de leur périphérie pour assurer la résistance mécanique par -boutement - comporter en entrée et en sortie de chaque étage un elément périphérique de renfort fermé assurant sa rigidité permettant d'assembler les différents étages entre eux soit par des moyens mécaniques - boulons, vis clips - soit soudure. The object of the invention is to provide a mixer made up of planar cut elements whose geometry guarantees the required homogeneity and assembled so as to guarantee the mechanical integrity necessary to withstand applications using very viscous fluids, easily achievable in particular with modern means of laser cutting. For this purpose, the static mixer according to the invention is characterized in that it comprises at least two perforated planar deflecting surfaces arranged obliquely to the main flow axis, at least one of said surfaces registering throughout the passage section. The shape of these surfaces follows from the envelope in which they are inscribed. For example, in the case of an envelope with a square or rectangular section, these perforated surfaces constituting the mixing element will themselves be square or rectangular. In the case of a circular envelope, the openwork surfaces will be elliptical or fractional elliptical. They can also interpenetrate according to the step to be taken to obtain the necessary homogeneity. In fact, experience has shown the relative arrangement of the openwork deflecting surfaces, the shape of the openings and the percentage of the vacuum thus created are important criteria to be met in order to meet the interest of static mixers which lies in obtaining an effective mixture, over a short treatment length with a pressure loss compatible with the application. In addition, this new type of mixer being produced from cut plants, its manufacturing costs are reduced and its construction extremely robust. According to the essential features of the invention, the deflecting surfaces are cut so as to - have lights creating the desired percentage of vacuum - be of homogeneous structure, that is to say having no added element - come in contact with the envelope over all or part of their periphery to ensure mechanical strength by -butting - include at the input and output of each stage a closed reinforcing peripheral element ensuring its rigidity making it possible to assemble the different stages between them either by mechanical means - bolts, screw clips - or welding.

Ces eléments, anneaux dans le cas d'une enveloppe tubulaire ou cadres dans le cas d'une enveloppe rectangulaire, peuvent soit épouser totalement la surface intérieure l'enveloppe soit comporter des évidements. Leur profil est adapté au type d'ecoulement, soit carré, rectangulaire ou biseauté. Ces renforts peuvent être réunis par des éléments droits - ronds ou plats - placés parallèlement aux géneratrices de l'enveloppe de façon à augmenter la resistance à l'ecrasement. These elements, rings in the case of a tubular casing or frames in the case of a rectangular casing, can either fully match the interior surface of the casing or have recesses. Their profile is adapted to the type of flow, either square, rectangular or beveled. These reinforcements can be joined by straight elements - round or flat - placed parallel to the generators of the envelope so as to increase the resistance to crushing.

De préférence, chacune des surfaces déflectrices est inclinée sur l'axe principal d'écoulement de façon l'angle d'attaque soit compris entre 45 et 30 . Preferably, each of the deflecting surfaces is inclined on the main flow axis so that the angle of attack is between 45 and 30.

Avantageusement, le pourcentage de vide ouvertures pratiquées dans les surfaces déflectrices est fonction du régime d'écoulement. Dans ce cas, on peut prévoir que ledit pourcentage est d'environ 65 % pour un nombre Reynolds à 400, d'environ 50 % pour un nombre de Reynolds compris entre 1000, d'environ 48 % pour un nombre Reynolds compris entre 1000 et 2000 et d'environ 46 % pour un nombre Reynolds supérieur à 2000. Advantageously, the percentage of vacuum openings made in the deflecting surfaces is a function of the flow regime. In this case, it can be predicted that said percentage is around 65% for a Reynolds number of 400, around 50% for a Reynolds number between 1000, around 48% for a Reynolds number between 1000 and 2000 and around 46% for a Reynolds number greater than 2000.

Selon forme de réalisation préférée de l'invention, les ouvertures des surfaces déflectrices planes sont rectangulaires, le grand axe de l'ouverture étant situé dans un plan passant par l'axe principal d'écoulement, le rapport longueur/largeur de l'ouverture étant supérieur à 5. According to a preferred embodiment of the invention, the openings of the flat deflecting surfaces are rectangular, the major axis of the opening being located in a plane passing through the main flow axis, the length / width ratio of the opening being greater than 5.

Nous décrivons ci-après l'invention au moyen d'exemples realisation en référence au dessin annexé. We describe below the invention by means of example embodiments with reference to the accompanying drawing.

figure 1 montre un mélangeur à deux étages disposé dans une enveloppe E1 à section rectangulaire, surfaces déflectrices D1 étant de forme rectangulaire. FIG. 1 shows a two-stage mixer placed in an envelope E1 of rectangular section, deflecting surfaces D1 being of rectangular shape.

figure 2 montre la disposition des surfaces déflectrices ajourées D2 placées dans une enveloppe E2 à section circulaire. FIG. 2 shows the arrangement of the perforated deflecting surfaces D2 placed in an envelope E2 of circular section.

figures 3 et 4 représentent respectivement deux surfaces déflectrices D3, D4 découpées pour s'inscrire l'une dans l'autre. La surface D3 (figure 3) s'appuie sur toute la surface intérieure de l'enveloppe à section circulaire. La surface D4 (figure 4) est placée dans la surface D3 symétriquement par rapport à l'axe principal d'écoulement fluides à mélanger. Des encoches A permettent un encastrement deux surfaces D3 et D4. Figures 3 and 4 show respectively two deflecting surfaces D3, D4 cut to fit one into the other. The surface D3 (FIG. 3) rests on the entire interior surface of the circular section envelope. The surface D4 (FIG. 4) is placed in the surface D3 symmetrically with respect to the main axis of fluid flow to be mixed. Notches A allow two surfaces D3 and D4 to be embedded.

figure 5 montre un renfort périphérique R1 utilisable dans une enveloppe à section carrée. FIG. 5 shows a peripheral reinforcement R1 usable in an envelope with a square section.

La figure 6 montre un renfort périphérique R2 dans une enveloppe à section circulaire. Figure 6 shows a peripheral reinforcement R2 in a circular section envelope.

figure 7 montre un exemple de renforts longitudinaux placés entre les renforts périphériques R2 de la figure 6.FIG. 7 shows an example of longitudinal reinforcements placed between the peripheral reinforcements R2 of FIG. 6.

Dans tous les exemples décrits et représentés, les enveloppes et E2 peuvent être ouvertes, du type canal, ou fermées, type tubulaire. In all the examples described and shown, the envelopes and E2 can be open, of the channel type, or closed, of the tubular type.

Claims (4)

REVENDICATIONS 1. Mélangeur statique comportant une enveloppe ouverte ou fermée (E1, E2) dans laquelle est disposé au moins un étage de mélange, caractérisé en ce qu'il comprend au moins deux surfaces déflectrices planes ajourées (D1, D2, D3, D4), au moins l'une desdites surfaces s'inscrivant dans toute la section de passage, lesdites surfaces étant inclinées par rapport à l'axe principal d'écoulement et comportant, de part et d'autre le long de l'enveloppe (E1, E2) des moyens périphériques d'arrêt (R1, R2).1. Static mixer comprising an open or closed envelope (E1, E2) in which is arranged at least one mixing stage, characterized in that it comprises at least two perforated flat deflecting surfaces (D1, D2, D3, D4), at least one of said surfaces being part of the entire passage section, said surfaces being inclined relative to the main flow axis and comprising, on either side along the envelope (E1, E2 ) peripheral stop means (R1, R2). 2. Mélangeur statique selon la revendication 1, caractérisé en ce que l'inclinaison des surfaces déflectrices (D1, , D3, D4) par rapport à l'axe d'écoulement principal est telle que l'angle d'attaque est compris entre 45" et 30 .2. Static mixer according to claim 1, characterized in that the inclination of the deflecting surfaces (D1,, D3, D4) relative to the main flow axis is such that the angle of attack is between 45 "and 30. 3. Mélangeur statique selon l'une des revendications 1 2, caractérisé en ce que le pourcentage de vide des ouvertures pratiquées dans les surfaces déflectrices est d'environ 65 pour un nombre de Reynolds inférieur à 400, d'environ 50 pour un nombre de Reynolds compris entre 400 et 1000, d'environ 48 % pour un nombre de Reynolds compris entre 1000 et 2000 et d'environ 46 % pour un nombre de Reynolds supérieur à 2000.3. Static mixer according to one of claims 1 2, characterized in that the percentage of vacuum of the openings made in the deflecting surfaces is approximately 65 for a Reynolds number less than 400, approximately 50 for a number of Reynolds between 400 and 1000, approximately 48% for a Reynolds number between 1000 and 2000 and approximately 46% for a Reynolds number greater than 2000. 4. Mélangeur statique selon l'une des revendications 1 3, caractérisé en ce que les ouvertures des surfaces déflectrices planes sont rectangulaires, le grand axe de l'ouverture étant situé dans un plan passant par l'axe principal d'écoulement, le rapport longueur/largeur de l'ouverture étant supérieur à 5.4. Static mixer according to one of claims 1 3, characterized in that the openings of the flat deflecting surfaces are rectangular, the major axis of the opening being located in a plane passing through the main flow axis, the ratio length / width of the opening being greater than 5.
FR0004476A 2000-04-07 2000-04-07 STATIC MIXER Expired - Fee Related FR2807336B1 (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100586544C (en) * 2004-12-16 2010-02-03 希尔蒂股份公司 Static mixing element for mixing flowable masses
EP2286904A1 (en) * 2009-08-12 2011-02-23 Fluitec Invest AG Static mixing device for flowable materials
WO2014142869A1 (en) * 2013-03-14 2014-09-18 Dow Global Technologies Llc Two part molded part useful as a mixer for viscous curable materials
JP2016055261A (en) * 2014-09-10 2016-04-21 旭有機材工業株式会社 Fluid mixer
US9726063B2 (en) 2011-09-08 2017-08-08 Tenneco Automotive Operating Company Inc. In-line flow diverter
US10077702B2 (en) 2011-09-08 2018-09-18 Tenneco Automotive Operating Company Inc. In-line flow diverter
CN114832706A (en) * 2022-04-15 2022-08-02 杭州正创新材料有限公司 Static mixing arrangement is used in silicone adhesive production

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1807922A1 (en) * 1967-11-09 1969-06-12 Teijin Ltd Device for mixing liquids in pipes
US4019719A (en) * 1975-06-05 1977-04-26 Schuster Hans H Fluid mixing device
US4062524A (en) * 1973-06-06 1977-12-13 Bayer Aktiengesellschaft Apparatus for the static mixing of fluid streams
DE2810648A1 (en) * 1978-03-11 1979-09-13 Basf Ag Static mixer tube for fluids - with holes in some inclined elliptical mixing elements
FR2468401A1 (en) * 1979-10-26 1981-05-08 Sulzer Ag STATIC MIXER
US4600544A (en) * 1982-11-29 1986-07-15 Merix Corporation Packing unit and method of making
US4929088A (en) * 1988-07-27 1990-05-29 Vortab Corporation Static fluid flow mixing apparatus
US5813762A (en) * 1996-04-12 1998-09-29 Sulzer Chemtech Ag Mixer tube for low viscosity fluids

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1807922A1 (en) * 1967-11-09 1969-06-12 Teijin Ltd Device for mixing liquids in pipes
US4062524A (en) * 1973-06-06 1977-12-13 Bayer Aktiengesellschaft Apparatus for the static mixing of fluid streams
US4019719A (en) * 1975-06-05 1977-04-26 Schuster Hans H Fluid mixing device
DE2810648A1 (en) * 1978-03-11 1979-09-13 Basf Ag Static mixer tube for fluids - with holes in some inclined elliptical mixing elements
FR2468401A1 (en) * 1979-10-26 1981-05-08 Sulzer Ag STATIC MIXER
US4600544A (en) * 1982-11-29 1986-07-15 Merix Corporation Packing unit and method of making
US4929088A (en) * 1988-07-27 1990-05-29 Vortab Corporation Static fluid flow mixing apparatus
US5813762A (en) * 1996-04-12 1998-09-29 Sulzer Chemtech Ag Mixer tube for low viscosity fluids

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100586544C (en) * 2004-12-16 2010-02-03 希尔蒂股份公司 Static mixing element for mixing flowable masses
EP2286904A1 (en) * 2009-08-12 2011-02-23 Fluitec Invest AG Static mixing device for flowable materials
US8807826B2 (en) 2009-08-12 2014-08-19 Fluitec Invest Ag Static mixing device for flowable substances
US9726063B2 (en) 2011-09-08 2017-08-08 Tenneco Automotive Operating Company Inc. In-line flow diverter
US10077702B2 (en) 2011-09-08 2018-09-18 Tenneco Automotive Operating Company Inc. In-line flow diverter
WO2014142869A1 (en) * 2013-03-14 2014-09-18 Dow Global Technologies Llc Two part molded part useful as a mixer for viscous curable materials
US9675943B2 (en) 2013-03-14 2017-06-13 Dow Global Technologies Llc Two part molded part useful as a mixer for viscous curable materials
US10265666B2 (en) 2013-03-14 2019-04-23 Dow Global Technologies Llc Two part molded part useful as a mixer for viscous curable materials
JP2016055261A (en) * 2014-09-10 2016-04-21 旭有機材工業株式会社 Fluid mixer
CN114832706A (en) * 2022-04-15 2022-08-02 杭州正创新材料有限公司 Static mixing arrangement is used in silicone adhesive production

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