EP2158027B2 - Elément de mélange statique - Google Patents

Elément de mélange statique Download PDF

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Publication number
EP2158027B2
EP2158027B2 EP08760786.7A EP08760786A EP2158027B2 EP 2158027 B2 EP2158027 B2 EP 2158027B2 EP 08760786 A EP08760786 A EP 08760786A EP 2158027 B2 EP2158027 B2 EP 2158027B2
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EP
European Patent Office
Prior art keywords
arrangement
static mixing
plane
accordance
bar elements
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.)
Active
Application number
EP08760786.7A
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German (de)
English (en)
Other versions
EP2158027A1 (fr
EP2158027B1 (fr
Inventor
Sebastian Hirschberg
Joachim Schoeck
Markus Fleischli
Felix Moser
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.)
Sulzer Chemtech AG
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Sulzer Chemtech AG
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Publication date
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Application filed by Sulzer Chemtech AG filed Critical Sulzer Chemtech AG
Priority to EP10182884.6A priority Critical patent/EP2277620B2/fr
Priority to EP08760786.7A priority patent/EP2158027B2/fr
Publication of EP2158027A1 publication Critical patent/EP2158027A1/fr
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Publication of EP2158027B1 publication Critical patent/EP2158027B1/fr
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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
    • 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
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/47—Mixing liquids with liquids; Emulsifying involving high-viscosity liquids, e.g. asphalt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/2805—Mixing plastics, polymer material ingredients, monomers or oligomers

Definitions

  • the invention relates to a static mixing element according to the preamble of claim 1.
  • the invention also relates to a static mixer containing such a mixing element.
  • a static mixing device which consists of a tubular housing and contains at least one mixing element arranged therein.
  • the mixing element consists of intersecting webs, which have an angle with respect to the tube axis.
  • the webs of the mixing elements are arranged in at least two groups. The ridges within each group are directed substantially parallel. The webs of one group intersect with the webs of the other group.
  • a static mixer which has a mixer insert, which consists of three or four mutually twisted around the Strörnungsraum gratings parallel bars.
  • the bars of a grid can be held in position by the bars of the other grid, without having to be connected to one another. Therefore, no additional effort for the welding together of the webs is required.
  • DE 44 28 813 shows a static mixing device, which unlike CH 642 564 has intersecting webs which overlap in the region of the crossing points.
  • This local broadening of the webs used in the DE 44 28 813 are designed as steel sheet bars, serves to reinforce and / or to form a positive connection of adjacent webs. In the widening a groove is cut, which receives an adjacent steel sheet bar.
  • EP 0 856 353 A1 shows a module which is part of a static mixing device, which is intended for a residence time critical, plastically flowable mix.
  • the device comprises a tubular housing in which webs are arranged. The webs are inclined against the longitudinal axis of the housing; they essentially intersect on a straight line perpendicular to the longitudinal axis.
  • the module comprises a sleeve which can be inserted into the housing.
  • the mixing material conducting inner wall of the static mixing device is formed by inner sides of the sleeve.
  • the webs are formed like a spike, each with a pointing against the direction of movement of the mix and a vertex attached to the sleeve inside base. Each vertex forms a gap with the interior wall of the device.
  • the object of the invention is to provide for said static mixer an improvement with which a lower pressure loss can be achieved with comparable or improved mixing efficiency.
  • An inventive static mixing element is designed according to claim 1.
  • the main flow direction is preferably in the direction of the longitudinal axis of a hollow body, in which the mixing element is received.
  • the spacing element can be designed as a local thickening or widening of at least one stake element.
  • the number of web elements can be 4 to 10 in the projection plane.
  • at least two web elements per arrangement are provided.
  • the first and the third web element are part of a first arrangement of web elements lying in a first plane.
  • the second and the fourth web element are part of a second arrangement of web elements lying in a second plane. At least a part of the web elements of the first arrangement may be arranged in a third plane, which is arranged offset to the first plane.
  • a part of the web elements of the second arrangement may be arranged in a fourth plane, wherein the fourth plane is arranged offset to the second plane.
  • the web elements have a width (H).
  • the sum ( ⁇ Hi) of the widths (H) of the web elements in the projection plane in relation to the diameter (D) of the hollow body is defined by the size z defined below.
  • the size z is in particular less than 95%, preferably less than 85%, in particular less than 75%, particularly preferably less than 65%.
  • the static mixing device comprises a static mixing element, as well as a hollow body or a sleeve to receive the static mixing element.
  • the static mixing element may be attached to the hollow body or the sleeve, wherein the static mixing element and the hollow body or the sleeve may consist of a single component.
  • the static mixing element may be fastened to the inner wall of the hollow body or the sleeve in the region of the intersection of the first plane with the second plane and / or in the region of at least part of the ends of the web elements.
  • a static mixing element for laminar flowing media, in particular polymer melts or other highly viscous fluids.
  • Fig. 1 shows four mixing elements, which are arranged one behind the other in a hollow body 10. Successive mixing elements 2 are pivoted at an angle of 90 'against each other about the hollow body axis 8, which acts as an axis of rotation.
  • the main flow direction of the fluid flowing through the hollow body 10 lies in the direction of the hollow body axis 8.
  • Each mixing element consists of arrangements of web elements (3, 4) arranged in two intersecting planes (5, 6).
  • An arrangement of web elements designates a number of web elements which lie substantially in one plane.
  • the first plane 5 contains a first arrangement 21 of web elements 3, a second plane 6 a second arrangement 31 of web elements 4.
  • the first and the second plane (5, 6) are arranged at an angle to one another, so that the first arrangement 21 of FIG Web elements 3 with the second arrangement 31 of web elements 4 crosses.
  • Adjacent web elements lie side by side in such a way that the sum of the widths (H) of the web elements is equal to the pipe diameter (D). In this case, therefore, the web elements directly adjoin one another.
  • each flowing fluid molecule encounters a web element, under the idealizing assumption that the fluid molecule was flowing along the main flow direction.
  • Each web element thus represents an obstacle to the flowing fluid molecule, so that a deflection of the fluid molecule takes place before it impinges on the web element.
  • a static mixing element 2 according to the invention for installation in a hollow body 10 contains a plurality of web elements.
  • a first web element 3 and a third web element 13 are arranged crosswise relative to a second web element 4 and a fourth web element 14.
  • the first web element 3 and the third web element 13 form a first arrangement 21 of web elements.
  • the second web element 4 and the fourth web element 14 form a second arrangement 31 of web elements.
  • a web element can be configured, for example, as a tube or as a plate, disk or bar-shaped element.
  • the cross section of the stake element can be edge-free, eg have a circular or elliptical cross-section.
  • the cross section may include edges, that is, for example, have a rectangular or diamond-shaped cross-section.
  • the connecting lines between the edges may be straight or curved, in particular convex or concave, which, for example, in the EP 1 305 108 B1 is realized.
  • a web element can protrude at least in sections from the associated arrangement, for example, have a corrugated structure. In this case, the previously described level of the arrangement is to be understood as a middle level.
  • the web elements can also be moved in the direction of an arrangement, i. in the corresponding plane or parallel to the middle plane, have an irregular structure, e.g. a wavy surface.
  • the width H of the web elements in this case is defined as the width of the web elements averaged over the web length.
  • the individual web elements also need not run parallel to one another, but they may have an angle relative to the other web elements of the same arrangement.
  • the surprising effect of the invention occurs in each of the mentioned web element cross sections and each of the web element shapes, that is, it is largely independent of the cross section and the shape of the web element. If the two arrangements 21 and 31 are projected onto a plane which is normal to the main flow direction, ie normal to the longitudinal axis 8 of the enveloping hollow body 10, the web elements of the arrangements 21 and 31 follow Fig. 1 in the projection flush with each other, that is, there are no gaps visible between the thus projected web elements. On the other hand, assuming the same projection in one of the embodiments Fig. 2 to Fig. 4 before, there are such gaps between the web elements.
  • Fig. 2 shows a radial section through a hollow body 10, in which exactly these projections of the web elements 3,13 and the web elements 4,14 are shown.
  • the web elements have in this illustration, the width (H) and have a distance (a) from each other, wherein the widths (H) and the distances (a) of adjacent web elements according to this particularly preferred embodiment are the same.
  • the surprising effect of the invention also occurs when the distances (a) and / or the widths (H) differ from each other.
  • Fig. 3 shows an embodiment of a mixing element according to the invention.
  • a plurality of web elements forms an arrangement of web elements if all web elements of the arrangement lie substantially in the same plane as in FIG Fig. 3 or if all the web elements are in substantially parallel but slightly offset planes in the direction of the longitudinal axis, as in FIG Fig. 4
  • the first arrangement 21 of web elements lying in a plane 5 comprises the two web elements 3, 13.
  • the second arrangement 31 of web elements lying on a plane 6 consists of the web elements 4, 14, 24.
  • two intersecting planes 5,6 are spanned.
  • the first and the second plane 5, 6 are arranged at an angle to one another, so that the web elements lying in the first plane 5 intersect with the web elements of the second plane 6, and form a cutting line 7.
  • z N * H / D .
  • N is the sum of the ridge elements of the first array 21 and the second array 31.
  • the outermost web elements of an arrangement bear on the inner wall of the hollow body, or at most have only a small distance from the inner wall.
  • the diameter of the hollow body is specified here in particular for hollow bodies with a circular cross-section.
  • the hollow body may also have an elliptical, polygonal, in particular rectangular or square cross-section.
  • the width dimension Db of the hollow body substantially corresponds to the width dimension Db of the mixing element, neglecting manufacturing and installation tolerances.
  • the sum of the areas of the web elements of two intersecting arrangements projected onto a plane perpendicular to the main flow direction is in each case less than 95% of the total cross-sectional area of the plane, preferably less than 85% of the entire plane, in particular less than 75% of the total Level, and more preferably less than 65% of the total level.
  • the number N of the web elements is a minimum of 4 and a maximum of 10.
  • FIG. 4 Another embodiment is in Fig. 4 shown. Deviating from Fig. 3 Now not all web elements (3, 13, 23) of a first arrangement 21 lie in a plane 5, but a part of the web elements lies in a plane 5 'which is essentially parallel but at least slightly displaced in the direction of the longitudinal axis.
  • the CoV becomes smaller.
  • the reduction of the coefficient of variation CoV was determined over a given mixer length with the same distribution and therefore also the same CoV before the mixers; the mixer, which has a smaller CoV after the given length, mixes more intensively or better.
  • the result of this study shows that mixing elements have significantly more favorable properties, which have a distance (a) between the intersecting web elements.
  • the distance (a) is preferably approximately the same size as the width (H) of the web elements.
  • FIG. 5 is the result of this study with respect to the pressure loss per mixer length and the mixing quality according to predetermined mixer length of the mixing element according to the invention in different variants in comparison with the prior art according to CH 642 564 shown.
  • the pressure loss is plotted relative to the pressure loss of the prior art and on the ordinate, the mixing quality after a predetermined mixer length relative to the mixing quality of the prior art for the same mixer length.
  • the single point 19 corresponds to the value pair for relative pressure loss and mixing quality according to the prior art. In the illustration, this value pair has been normalized to (1,1), so that the relative pressure loss according to the invention is between 20 and 80% of the pressure loss according to the prior art.
  • the CoV after a given mixer length is between 75% and 125% of the value according to the prior art.
  • the course of the graph 20 thus clearly shows that, despite the much lower pressure loss, even a significant improvement in the mixing quality, in particular a CoV of between 75 and 100%, can be achieved.
  • a smaller CoV according to the above definition stands for a better mixing quality.
  • the relative pressure loss can be reduced by more than 2/3 of the pressure loss of the prior art.
  • the mixing quality can be up to 20% compared to the prior art according to a predetermined mixer length CH 642 564 be improved, while reducing the pressure loss to over 50% compared to the mixer according to the CH 642 564 is achievable.
  • the illustrated mixing element in the diagram corresponds to a point with about 60% lower pressure loss than the prior art of at the same time with 20% better mixing quality after the same mixer length.
  • spacer elements are at least partially spacer elements (15,16) arranged between adjacent web elements.
  • the spacer elements By means of the spacer elements, the mounting of the web elements can be made possible or simplified.
  • the spacer elements can serve to increase the stability of the static mixing element.
  • Spacer elements may be separate components that can be connected to the web elements, for example by welding, or be designed in the form of local thickening or widening. An example of such widening in the area near the wall of the bar is in Fig. 6 shown.
  • Fig. 6 shows a detail of a crossing region of two web elements 3,4 with spacers 15, 16 in the form of local thickening and widening. These thickenings serve to connect the two web elements together.
  • the thickenings are essentially limited to the crossing area. Since the thickening 16 represents only a local connection of the web elements, it has at most a small influence on the flow.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Claims (13)

  1. Elément de mélange statique qui présente une dimension en largeur Db et qui convient pour le montage dans un corps creux (10) d'une dimension en largeur Db sensiblement égale, qui comporte une pluralité d'éléments de barrette, où l'élément de mélange statique est constitué d'un premier agencement (21) qui contient au moins un premier élément de barrette (3) et d'un deuxième agencement (31) qui contient au moins un deuxième élément de barrette (4), et le premier agencement (21) est disposé en croix relativement au deuxième agencement (31), où le premier agencement (21) et le deuxième agencement (31) forment un angle non égal à 0° à la direction d'écoulement principale, et le premier agencement forme avec le deuxième agencement un angle supérieur à 0°, et lors de la projection du premier agencement (21) et du deuxième agencement (31) sur un plan de projection, qui est perpendiculaire à la direction d'écoulement principale, se trouvent entre des éléments de barrette avoisinants au moins en partie des espaces intermédiaires, où chacun des éléments de barrette présente une largeur H, et la somme relative z des largeurs H des éléments de barrette, mesurée dans la direction de la dimension en largeur Db de l'élément de mélange, est plus petite que 95% de la dimension en largeur Db de l'élément de mélange, et où est formée par le premier agencement (21) et le deuxième agencement (31) une ligne de coupe (7) au voisinage de laquelle est disposé un élément d'écartement (15, 16).
  2. Elément de mélange statique selon la revendication 1, dans lequel la direction d'écoulement principale se situe dans la direction de l'axe longitudinal d'un corps creux dans lequel est reçu l'élément de mélange.
  3. Elément de mélange statique selon la revendication 1, dans lequel l'élément d'écartement (15, 16) est réalisé sous forme d'épaississement ou d'élargissement local d'au moins un élément de barrette.
  4. Elément de mélange statique selon l'une des revendications précédentes, dans lequel le nombre des éléments de barrette dans le plan de projection est de 4 à 10.
  5. Elément de mélange statique selon l'une des revendications précédentes, dans lequel au moins deux éléments de barrette sont prévus par agencement.
  6. Elément de mélange statique selon la revendication 5, dans lequel le premier et le troisième élément de barrette (3, 13) font partie du premier agencement (21) d'éléments de barrette se situant dans un premier plan (5), et le deuxième et le quatrième élément de barrette (4, 14) font partie d'un deuxième agencement (31) d'éléments de barrette (4, 14, 24) situé dans un deuxième plan (6).
  7. Elément de mélange statique selon la revendication 5, dans lequel au moins une partie des éléments de barrette du premier agencement (21) sont disposés dans un troisième plan (5') qui est décalé par rapport au premier plan (5) et/ou au moins une partie des éléments de barrette du deuxième agencement (31) sont disposés dans un quatrième plan, où le quatrième plan est décalé par rapport au deuxième plan (6).
  8. Elément de mélange statique selon l'une des revendications précédentes, dans lequel z est plus petit que 85%, en particulier plus petit que 75%, selon une préférence particulière plus petit que 65%.
  9. Dispositif de mélange statique (1) comprenant un élément de mélange statique selon l'une des revendications précédentes, ainsi qu'un corps creux (10) ou une douille pour recevoir l'élément de mélange statique.
  10. Dispositif de mélange statique selon la revendication 11, dans lequel l'élément de mélange statique est fixé au corps creux (10) ou à la douille.
  11. Dispositif de mélange statique selon la revendication 12, dans lequel l'élément de mélange statique et le corps creux (10) ou la douille sont formés par un seul composant.
  12. Dispositif de mélange statique selon les revendications 10 ou 11 dépendant des revendications 6 ou 7, où l'élément de mélange statique est fixé dans la zone de l'intersection du premier plan (5) avec le deuxième plan (6) et/ou dans la zone d'au moins une partie des extrémités des éléments de barrette à la paroi intérieure du corps creux ou de la douille.
  13. Utilisation d'un élément de mélange statique selon l'une des revendications précédentes pour le mélange ou pour la mise en contact de milieux, où au moins l'un d'eux est un milieu s'écoulant d'une manière laminaire, en particulier une fonte de polymère ou un autre fluide hautement visqueux.
EP08760786.7A 2007-06-22 2008-06-10 Elément de mélange statique Active EP2158027B2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP10182884.6A EP2277620B2 (fr) 2007-06-22 2008-06-10 Elément de mélange statique
EP08760786.7A EP2158027B2 (fr) 2007-06-22 2008-06-10 Elément de mélange statique

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP07110892 2007-06-22
PCT/EP2008/057226 WO2009000642A1 (fr) 2007-06-22 2008-06-10 Élément de mélange statique
EP08760786.7A EP2158027B2 (fr) 2007-06-22 2008-06-10 Elément de mélange statique

Related Child Applications (3)

Application Number Title Priority Date Filing Date
EP10182884.6A Division EP2277620B2 (fr) 2007-06-22 2008-06-10 Elément de mélange statique
EP10182884.6A Division-Into EP2277620B2 (fr) 2007-06-22 2008-06-10 Elément de mélange statique
EP10182884.6 Division-Into 2010-09-29

Publications (3)

Publication Number Publication Date
EP2158027A1 EP2158027A1 (fr) 2010-03-03
EP2158027B1 EP2158027B1 (fr) 2011-11-09
EP2158027B2 true EP2158027B2 (fr) 2016-04-27

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ID=38657846

Family Applications (2)

Application Number Title Priority Date Filing Date
EP10182884.6A Active EP2277620B2 (fr) 2007-06-22 2008-06-10 Elément de mélange statique
EP08760786.7A Active EP2158027B2 (fr) 2007-06-22 2008-06-10 Elément de mélange statique

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP10182884.6A Active EP2277620B2 (fr) 2007-06-22 2008-06-10 Elément de mélange statique

Country Status (13)

Country Link
US (1) US8491180B2 (fr)
EP (2) EP2277620B2 (fr)
JP (2) JP5555622B2 (fr)
KR (1) KR101516331B1 (fr)
CN (2) CN102861522A (fr)
AT (2) ATE532579T1 (fr)
BR (1) BRPI0813433B1 (fr)
CA (1) CA2691049C (fr)
ES (2) ES2382230T5 (fr)
MX (1) MX2009013424A (fr)
RU (1) RU2470702C2 (fr)
TW (1) TWI417135B (fr)
WO (1) WO2009000642A1 (fr)

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ES2382230T5 (es) 2015-03-13
EP2277620A2 (fr) 2011-01-26
TW200906480A (en) 2009-02-16
MX2009013424A (es) 2010-01-15
RU2470702C2 (ru) 2012-12-27
EP2158027A1 (fr) 2010-03-03
JP2010530819A (ja) 2010-09-16
ATE549079T1 (de) 2012-03-15
ES2375592T3 (es) 2012-03-02
KR101516331B1 (ko) 2015-05-04
EP2277620B2 (fr) 2015-02-18
ES2375592T5 (es) 2016-06-08
KR20100022995A (ko) 2010-03-03
JP5555622B2 (ja) 2014-07-23
EP2277620A3 (fr) 2011-02-16
ATE532579T1 (de) 2011-11-15
JP2013212508A (ja) 2013-10-17
BRPI0813433B1 (pt) 2018-12-04
EP2158027B1 (fr) 2011-11-09
CA2691049A1 (fr) 2008-12-31
CA2691049C (fr) 2015-05-19
CN101743055B (zh) 2013-03-27
US8491180B2 (en) 2013-07-23
ES2382230T3 (es) 2012-06-06
TWI417135B (zh) 2013-12-01
WO2009000642A1 (fr) 2008-12-31
EP2277620B1 (fr) 2012-03-14
CN102861522A (zh) 2013-01-09
US20100202248A1 (en) 2010-08-12
RU2010101901A (ru) 2011-07-27
BRPI0813433A2 (pt) 2015-08-18

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