EP0546989B1 - Static mixing element with guiding faces - Google Patents

Static mixing element with guiding faces Download PDF

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Publication number
EP0546989B1
EP0546989B1 EP92810882A EP92810882A EP0546989B1 EP 0546989 B1 EP0546989 B1 EP 0546989B1 EP 92810882 A EP92810882 A EP 92810882A EP 92810882 A EP92810882 A EP 92810882A EP 0546989 B1 EP0546989 B1 EP 0546989B1
Authority
EP
European Patent Office
Prior art keywords
baffles
mixing element
accordance
channel
guide surfaces
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.)
Expired - Lifetime
Application number
EP92810882A
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German (de)
French (fr)
Other versions
EP0546989A1 (en
Inventor
Willy Dr. Tauscher
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
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 Sulzer Chemtech AG filed Critical Sulzer Chemtech AG
Publication of EP0546989A1 publication Critical patent/EP0546989A1/en
Application granted granted Critical
Publication of EP0546989B1 publication Critical patent/EP0546989B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B01F25/43197—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor characterised by the mounting of the baffles or obstructions
    • B01F25/431971—Mounted on the wall
    • 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

Definitions

  • the invention relates to a static mixing element according to the preamble of claim 1.
  • static mixing elements are known from international application WO 90/00929.
  • Simple static mixing elements with baffles are known, but they still have a very limited mixing and homogenizing effect and still cause a relatively high pressure drop.
  • More complex static mixers e.g. Consisting of intersecting subchannels of fins (Sulzer SMV mixer), they have very good mixing properties, but are often still relatively expensive to manufacture.
  • the dependent claims relate to advantageous developments of the invention.
  • intersecting partial streams are generated in the radial direction with a particularly good mixing effect in the simplest possible way.
  • the projection FZ of the guide surfaces in the main flow direction can only be 5% to 30% of the channel cross section and thus achieve optimal mixing even with little effort and pressure drop.
  • the guiding surfaces can be trapezoidal or rounded, they can be offset from one another and can be distributed substantially uniformly over the entire channel cross section. Adjacent or successive guide surfaces can be offset from one another, or can also be arranged rotated with respect to the main flow direction Z and the normal N to the channel wall.
  • FIG. 1 shows a mixing element according to the invention with two guide surfaces 10 fixed to the wall of a flow channel 7 in a cross-sectional surface 21 in two views.
  • the trapezoidal guide surfaces 10 widen towards the interior of the channel.
  • the width A on the channel wall 7 is smaller than the width B in the interior of the channel. This allows better flow around the back of the guide surfaces 11 in the direction of the arrows 9.
  • the guide surfaces 10 are offset from one another and by an angle W of e.g. 30 ° inclined to the main flow direction Z of the fluid 2 with opposite orientations.
  • the guide surfaces produce corresponding flow cones deflected in the directions 5, 6, which result in intensive mixing. Cross currents generated by offset guiding surfaces are particularly effective.
  • the projection FZ of the guide surfaces in the flow direction Z is less than 30% of the cross-sectional area F of the flow channel (FIG. 1b).
  • FC cross-sectional area
  • FC e.g. 10% to 20% of F
  • two further wall guide surfaces 10 are arranged, these being offset against the guide surfaces of the first cross section 21. This results in a further intensive mixing of the partial flows of the individual guide surfaces 10.
  • Also known guide surfaces that become narrower towards the inside could also be arranged offset. As explained, however, this would result in poor flow around the rear.
  • FIGS. 2a to c show guide surfaces 10 with different possible shapes. These can be trapezoidal 12, rounded 13 or combined 14, for example his.
  • the guide surfaces can also have different shapes or sizes.
  • the guide surfaces could also be split, kinked, bent or twisted. Particularly for high speeds and high loads, the guide surfaces can also have reinforcements and stiffeners, for example in the form of a rib 18 in FIG. 2a.
  • Opposing guide surfaces can also be connected to form truss-like structures, as shown, for example, with the struts 19 in FIG. 3.
  • an example is shown with a plurality of guide surfaces 10, which are evenly distributed over the entire channel cross section F with (in the figure) alternating upward and downward partial streams 5, 6 and cross currents thus generated.
  • FIG. 4 shows a further example with twisted guide surfaces 10 in a round flow channel 7. These twisted guide surfaces also produce intersecting partial flows, for example in directions 5, 6, which do not run radially. A slight twisting of the guide surfaces 10 again significantly improves the flow around the rear 11.
  • FIG. 5 shows a mixing element with guide surfaces in two cross-sectional planes 21, 22.
  • the guide surfaces of plane 22 are offset from those of first plane 21.
  • the guiding surfaces create radial partial flows, which also mix intensively.
  • a larger distance can also be provided between two levels, which acts as a post-mixing section.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)

Description

Die Erfindung betrifft ein statisches Mischelement gemäß dem Oberbegriff von Anspruch 1. Solche Mischelemente sind aus der Internationalen Anmeldung WO 90/00929 bekannt. Es sind einfache statische Mischelemente mit Leitflächen bekannt, welche jedoch noch eine sehr beschränkte Misch- und Homogenisierungswirkung aufweisen und dabei immer noch einen relativ hohen Druckabfall bewirken. Aufwendigere statische Mischer, z.B. bestehend aus sich kreuzenden Teilkanälen von Lamellen (Sulzer-SMV-Mischer), weisen wohl sehr gute Mischeigenschaften auf, sind aber oft noch relativ aufwendig herzustellen.The invention relates to a static mixing element according to the preamble of claim 1. Such mixing elements are known from international application WO 90/00929. Simple static mixing elements with baffles are known, but they still have a very limited mixing and homogenizing effect and still cause a relatively high pressure drop. More complex static mixers, e.g. Consisting of intersecting subchannels of fins (Sulzer SMV mixer), they have very good mixing properties, but are often still relatively expensive to manufacture.

Es ist daher Aufgabe der vorliegenden Erfindung, mit sehr einfachen Mitteln eine gute Mischwirkung bei relativ geringem Druckabfall zu erreichen. Diese Aufgabe wird erfindungsgemäss gelöst nach Anspruch 1. Die Fixierung der Leitflächen an der Kanalwand ist einfach und mechanisch stabil. Damit die Leitflächen dennoch möglichst verlustfrei auf Vorder- und Rückseite umströmt werden, sind sie an der Wand schmaler ausgebildet als im Kanalinnern, und in Richtung des Winkels W entsteht gleichzeitig eine effiziente Ablenkung und Verwirbelung.It is therefore an object of the present invention to achieve a good mixing effect with a relatively low pressure drop using very simple means. According to the invention, this object is achieved according to claim 1. The fixing of the guide surfaces on the channel wall is simple and mechanically stable. So that the flow around the front and back of the guide surfaces is as loss-free as possible, they are narrower on the wall than in the interior of the channel, and in the direction of the angle W there is an efficient deflection and swirl.

Die abhängigen Ansprüche betreffen vorteilhafte Weiterbildungen der Erfindung. Durch die Anordnung von wenigen Leitflächen mit unterschiedlichen Orientierungen werden sich kreuzende Teilströme in radialer Richtung mit besonders guter Mischwirkung auf möglichst einfache Art erzeugt. Die Projektion FZ der Leitflächen in Hauptströmungsrichtung kann nur 5 % bis 30 % des Kanalquerschnitts betragen und damit schon bei geringem Aufwand und Druckabfall eine optimale Vermischung erzielen. Die Leitflächen können trapezförmig oder gerundet sein, sie können gegeneinander versetzt angeordnet und im wesentlichen gleichmässig über den ganzen Kanalquerschnitt verteilt sein. Benachbarte oder aufeinanderfolgende Leitflächen können gegeneinander versetzt, oder auch bezüglich der Hauptströmungsrichtung Z und der Normalen N zur Kanalwand verdreht angeordnet sein.The dependent claims relate to advantageous developments of the invention. By arranging a few guide surfaces with different orientations, intersecting partial streams are generated in the radial direction with a particularly good mixing effect in the simplest possible way. The projection FZ of the guide surfaces in the main flow direction can only be 5% to 30% of the channel cross section and thus achieve optimal mixing even with little effort and pressure drop. The guiding surfaces can be trapezoidal or rounded, they can be offset from one another and can be distributed substantially uniformly over the entire channel cross section. Adjacent or successive guide surfaces can be offset from one another, or can also be arranged rotated with respect to the main flow direction Z and the normal N to the channel wall.

Die Erfindung wird im folgenden anhand von Figuren und Ausführungsbeispielen weiter erläutert. Es zeigt:

Fig. 1a, b
Ein erfindungsgemässes Mischelement mit zwei Leitflächen in einer Querschnittsebene in zwei Ansichten;
Fig. 2a bis d
Beispiele von Leitflächenformen und -orientierungen;
Fig. 3
ein Beispiel mit mehreren, regelmässig über den Kanalquerschnitt verteilten Leitflächen;
Fig. 4
ein Beispiel mit verdrehten Leitflächen in einem runden Strömungskanal;
Fig. 5a, b
ein Beispiel mit versetzten Leitflächen in zwei Querschnittsebenen des Strömungskanals.
The invention is explained in more detail below with reference to figures and exemplary embodiments. It shows:
Fig. 1a, b
A mixing element according to the invention with two guide surfaces in a cross-sectional plane in two views;
2a to d
Examples of control surface shapes and orientations;
Fig. 3
an example with several baffles that are regularly distributed over the channel cross-section;
Fig. 4
an example with twisted guide surfaces in a round flow channel;
5a, b
an example with staggered guide surfaces in two cross-sectional planes of the flow channel.

Fig. 1 zeigt ein erfindungsgemässes Mischelement mit zwei an der Wand eines Strömungskanals 7 fixierten Leitflächen 10 in einer Querschnittsfläche 21 in zwei Ansichten. Die trapezförmigen Leitflächen 10 verbreitern sich gegen das Kanalinnere hin. Die Breite A an der Kanalwand 7 ist kleiner als die Breite B im Kanalinnern. Dadurch kann die Rückseite der Leitflächen 11 in Richtung der Pfeile 9 besser umströmt werden. Die Leitflächen 10 sind gegeneinander versetzt und um je einen Winkel W von z.B. 30° gegen die Hauptströmungsrichtung Z des Fluids 2 geneigt mit entgegengesetzten Orientierungen. Die Leitflächen erzeugen entsprechende, in die Richtungen 5, 6 abgelenkte Strömungskegel, welche eine intensive Vermischung ergeben. Besonders wirkungsvoll sind durch versetzte Leitflächen erzeugte Kreuzströme. Die Projektion FZ der Leitflächen in Strömungsrichtung Z beträgt weniger als 30 % der Querschnittsfläche F des Strömungskanals (Fig. 1b). Schon mit einem Anteil FZ von z.B. 10 % bis 20 % von F können turbulente, sich intensiv vermischende Strömungen erzeugt werden. In einer darauffolgenden nächsten Querschnittsebene 22 sind zwei weitere Wandleitflächen 10 angeordnet, wobei diese gegen die Leitflächen des ersten Querschnitts 21 versetzt sind. Dies ergibt eine weitere intensive Vermischung der Teilströmungen der einzelnen Leitflächen 10. Auch bekannte, nach innen schmaler werdende Leitflächen könnten so versetzt angeordnet werden. Dies ergäbe jedoch wie erläutert eine schlechte Umströmung der Rückseite.1 shows a mixing element according to the invention with two guide surfaces 10 fixed to the wall of a flow channel 7 in a cross-sectional surface 21 in two views. The trapezoidal guide surfaces 10 widen towards the interior of the channel. The width A on the channel wall 7 is smaller than the width B in the interior of the channel. This allows better flow around the back of the guide surfaces 11 in the direction of the arrows 9. The guide surfaces 10 are offset from one another and by an angle W of e.g. 30 ° inclined to the main flow direction Z of the fluid 2 with opposite orientations. The guide surfaces produce corresponding flow cones deflected in the directions 5, 6, which result in intensive mixing. Cross currents generated by offset guiding surfaces are particularly effective. The projection FZ of the guide surfaces in the flow direction Z is less than 30% of the cross-sectional area F of the flow channel (FIG. 1b). Already with a share of FC of e.g. 10% to 20% of F can generate turbulent, intensely mixing flows. In a subsequent next cross-sectional plane 22, two further wall guide surfaces 10 are arranged, these being offset against the guide surfaces of the first cross section 21. This results in a further intensive mixing of the partial flows of the individual guide surfaces 10. Also known guide surfaces that become narrower towards the inside could also be arranged offset. As explained, however, this would result in poor flow around the rear.

Die Figuren 2a bis c zeigen Leitflächen 10 mit verschiedenen möglichen Formen. Diese können beispielsweise trapezförmig 12, gerundet 13 oder kombiniert 14 ausgebildet sein. Die Leitflächen können auch unterschiedliche Formen oder Grössen aufweisen. Die Leitflächen könnten auch gespalten, abgeknickt, gebogen oder verdreht ausgeführt sein. Besonders für hohe Geschwindigkeiten und starke Belastungen können die Leitflächen auch Verstärkungen und Versteifungen, z.B. in Form einer Rippe 18 in Fig. 2a aufweisen. Gegenüberliegende Leitflächen können auch zu fachwerkartigen Strukturen verbunden sein, wie beispielsweise mit den Verstrebungen 19 in Fig. 3 dargestellt. Hier ist ein Beispiel gezeigt mit mehreren Leitflächen 10, welche über den ganzen Kanalquerschnitt F gleichmässig verteilt sind mit (in der Figur) abwechselnd nach oben und nach unten gerichteten Teilströmen 5, 6 und damit erzeugten Kreuzströmungen. In Fig. 2d ist eine Leitfläche 10 bezüglich der Hauptströmungsrichtung Z und der Normalen N zur Kanalwand 7 verdreht angeordnet; d.h. die Normale 15 der Leitfläche 10 liegt nicht in der Ebene Z, N. Sie ist in Richtung V herausgedreht. Fig. 4 zeigt ein weiteres Beispiel mit verdreht angeordneten Leitflächen 10 in einem runden Strömungskanal 7. Diese verdrehten Leitflächen erzeugen ebenfalls sich kreuzende Teilströmungen z.B. in die Richtungen 5, 6, welche nicht radial verlaufen. Eine leichte Verdrehung der Leitflächen 10 verbessert die Umströmung auf der Rückseite 11 nochmals deutlich.FIGS. 2a to c show guide surfaces 10 with different possible shapes. These can be trapezoidal 12, rounded 13 or combined 14, for example his. The guide surfaces can also have different shapes or sizes. The guide surfaces could also be split, kinked, bent or twisted. Particularly for high speeds and high loads, the guide surfaces can also have reinforcements and stiffeners, for example in the form of a rib 18 in FIG. 2a. Opposing guide surfaces can also be connected to form truss-like structures, as shown, for example, with the struts 19 in FIG. 3. Here, an example is shown with a plurality of guide surfaces 10, which are evenly distributed over the entire channel cross section F with (in the figure) alternating upward and downward partial streams 5, 6 and cross currents thus generated. 2d, a guide surface 10 is arranged rotated with respect to the main flow direction Z and the normal N to the channel wall 7; ie the normal 15 of the guide surface 10 is not in the plane Z, N. It is turned out in the direction V. FIG. 4 shows a further example with twisted guide surfaces 10 in a round flow channel 7. These twisted guide surfaces also produce intersecting partial flows, for example in directions 5, 6, which do not run radially. A slight twisting of the guide surfaces 10 again significantly improves the flow around the rear 11.

Fig. 5 zeigt ein Mischelement mit Leitflächen in zwei Querschnittsebenen 21, 22. Die Leitflächen der Ebene 22 sind gegen jene der ersten Ebene 21 versetzt angeordnet. Die Leitflächen erzeugen hier radiale Teilströmungen, welche sich aber ebenfalls intensiv vermischen. Bei Mischelementen mit Leitflächen in mehreren Ebenen kann zwischen zwei Ebenen auch ein grösserer Abstand vorgesehen sein, welcher als Nachmischstrecke wirkt.FIG. 5 shows a mixing element with guide surfaces in two cross-sectional planes 21, 22. The guide surfaces of plane 22 are offset from those of first plane 21. The guiding surfaces create radial partial flows, which also mix intensively. In the case of mixing elements with baffles in several levels, a larger distance can also be provided between two levels, which acts as a post-mixing section.

BezeichnungslisteLabel list

22nd
Fluid in 7Fluid in 7
5, 65, 6
TeilstromrichtungenPartial flow directions
77
Stömungskanal, WandFlow channel, wall
99
Umströmungsrichtung nach 11Flow direction according to 11
1010th
LeitflächenControl surfaces
1111
Rückseite von 10Back of 10
12 bis 1412 to 14
Beispiele von 10Examples of 10
1515
Normale von 10Normal of 10
1818th
VersteifungsrippeStiffening rib
1919th
VerbindungselementFastener
21, 2221, 22
Querschnittsebenen von 7Cross-sectional planes of 7
AA
Breite von 10 an der WandWidth of 10 on the wall
BB
Breite von 10 im InnernWidth of 10 inside
FF
KanalquerschnittChannel cross section
FZFZ
in Z-Richtung projizierte Fläche von 10 in einer EbeneArea of 10 projected in the Z direction in one plane
NN
Normale zu 7Normal to 7
VV
Verdrehung von 10Twist by 10
WW
Winkel der Leitfläche zu ZAngle of the guide surface to Z
ZZ.
HaupströmungsrichtungMain flow direction

Claims (9)

  1. Static mixing element in a flow channel (7) having at least two baffles (10), wherein the baffles (10) are mounted on the channel wall (7) and have an angle W to the main flow directions Z of 10° to 45°, characterised in that the baffles are broader (B) in the interior of the channel than at the channel wall (A).
  2. Static element in accordance with claim 1, characterised in that adjacent guided surfaces are arranged with different orientations (5, 6) substantially crossing each other.
  3. Mixing element in accordance with one of the preceding claims, characterised in that the projection FZ of the baffles in the main flow direction amounts to 5 % to 30 % of the channel cross-section F.
  4. Mixing element in accordance with one of the preceding claims, characterised in that laterally adjacent or sequential baffles (10) are arranged displaced relative to one another.
  5. Mixing element in accordance with one of the preceding claims, characterised in that the baffles (10) are trapezoidal or rounded.
  6. Mixing element in accordance with one of the preceding claims, characterised in that oppositely disposed baffles are connected together at their free inner ends by a holder element (19).
  7. Mixing element in accordance with one of the preceding claims, characterised in that the baffles (10) are arranged substantially uniformly distributed in a cross-sectional surface F of the channel.
  8. Mixing element in accordance with one of the preceding claims, characterised in that the baffles are arranged in at least two sequential cross-sectional planes (21, 22).
  9. Mixing element in accordance with one of the preceding claims, characterised in that the baffles are arranged twisted or turned V relative to the channel wall (7) with respect to the main flow direction Z and the normal N.
EP92810882A 1991-12-10 1992-11-13 Static mixing element with guiding faces Expired - Lifetime EP0546989B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3632/91 1991-12-10
CH363291 1991-12-10

Publications (2)

Publication Number Publication Date
EP0546989A1 EP0546989A1 (en) 1993-06-16
EP0546989B1 true EP0546989B1 (en) 1995-11-15

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EP92810882A Expired - Lifetime EP0546989B1 (en) 1991-12-10 1992-11-13 Static mixing element with guiding faces

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US (1) US5330267A (en)
EP (1) EP0546989B1 (en)
DE (1) DE59204349D1 (en)

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DE59204349D1 (en) 1995-12-21
EP0546989A1 (en) 1993-06-16
US5330267A (en) 1994-07-19

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