EP0226879B1 - Static mixer for fluids containing or composed of solid particles - Google Patents

Static mixer for fluids containing or composed of solid particles Download PDF

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Publication number
EP0226879B1
EP0226879B1 EP86116622A EP86116622A EP0226879B1 EP 0226879 B1 EP0226879 B1 EP 0226879B1 EP 86116622 A EP86116622 A EP 86116622A EP 86116622 A EP86116622 A EP 86116622A EP 0226879 B1 EP0226879 B1 EP 0226879B1
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EP
European Patent Office
Prior art keywords
webs
casing
mixing device
mixing
static mixing
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
EP86116622A
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German (de)
French (fr)
Other versions
EP0226879A1 (en
Inventor
Hans Meyer
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 AG
Original Assignee
Gebrueder Sulzer 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 Gebrueder Sulzer AG filed Critical Gebrueder Sulzer AG
Priority to AT86116622T priority Critical patent/ATE52939T1/en
Publication of EP0226879A1 publication Critical patent/EP0226879A1/en
Application granted granted Critical
Publication of EP0226879B1 publication Critical patent/EP0226879B1/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
    • B01F25/4316—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

Definitions

  • the invention relates to a static mixing device for fluids containing or consisting of solid particles according to the preamble of claim 1.
  • Such cases occur, for example, in municipal wastewater treatment, e.g. when mixing chemicals in sludge, in the paper industry or also in the food industry, e.g. when mixing fruit pieces in yogurt.
  • a mixing device is also known from US-A-3733057, the mixing device consisting of a tubular housing with at least one mixing element arranged therein, which has two or more webs inclined with respect to the longitudinal axis of the housing, the outer contour of the webs being adapted to the housing wall .
  • This mixing device is essentially a mixer of the so-called "KENICS-NISCHER-TYPE", but there is a through channel in the center.
  • the invention is based, for media of the type mentioned above, i. even fluids consisting of piece goods or containing piece goods to create a blockage-free, static mixing device which also ensures homogeneous mixing with an acceptable pressure loss.
  • the design according to the invention of a static mixing device prevents the settling or catching of solid particles between the webs and casing wall or between crossing webs with simple means, so that a perfect mixing can be carried out in the device.
  • the outer webs or the one ends of the inner webs can be welded or soldered to the tube wall, for example.
  • the device cross section can be both circular and have a different contour, e.g. be a rectangle.
  • the web cross sections can taper towards the free ends.
  • the cross sections and the longitudinal section shapes advantageously have aerodynamic contours, e.g. rectangular, elliptical or semicircular.
  • the angle between the webs and the tube axis is advantageously in the range from 30 to 60 °, in particular 45 and 30 °.
  • mixing elements are arranged in a mixing device, an advantageous development of the invention can consist in that the successive ones.
  • Mixing elements are each arranged at an angle, in particular offset by 90 °, in the housing. This ensures spatial homogeneity.
  • Another application can e.g. consist of mixing flocculation chemicals in secondary sewage sludge in front of a centrifugal decanter of a municipal sewage treatment plant for sludge dewatering.
  • the installation of a mixer according to the invention takes into account the requirement for an efficient use of the quantity of chemicals for rapid and uniform mixing.
  • each mixing element pivoted relative to one another by 90 ° are arranged in a casing tube 1.
  • each mixing element consists of three webs 2a to 2c, with a space remaining between the crossing webs, as can be clearly seen from FIGS. 2a to 2d.
  • FIGS. 1 to 2d is a particularly advantageous embodiment, it is in principle also possible, depending on the process in which the mixing device is to be used, to design the mixing device with a plurality of webs. 3 and 4, a mixing element is shown, which is arranged in a tube 3 and which consists of two outer webs 4a and 4c and inner webs 4b, 4d and 4e.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Gas Separation By Absorption (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Detergent Compositions (AREA)
  • Lubricants (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

The static mixing device employs mixing elements, each of which has at least three transversely spaced webs. The webs are spaced transversely from each other to provide gaps through which a fluid may pass during mixing. In addition, each web while being secured to the casing at the upper ends relative to a downward flow has lower terminal ends which are spaced from the casing to provide further gaps through which the liquid may pass during a downward descent.

Description

Die Erfindung betrifft eine statische Mischvorrichtung für Feststoffteilchen enthaltende oder daraus bestehende Fluide gemäss Oberbegriff von Patentanspruch 1.The invention relates to a static mixing device for fluids containing or consisting of solid particles according to the preamble of claim 1.

Die bekannten statischen Mischvorrichtungen, wie sei beispielsweise in den schweizerischen Patentschriften 642 564, 547 120 oder 578 370 beschrieben sind, weisen alle den Nachteil auf, dass sie zur Verstopfung bei Einsatz von Feststoffteilchen enthaltenden oder daraus bestehenden Fluiden neigen. Derartige Fluide können z.B. aus verschiedenen Granulaten bestehen, die miteinander homogen vermischt werden sollen oder Flüssigkeiten sein, welche beispielsweise Fasern oder andere Feststoffteilchen enthalten.The known static mixing devices, as described, for example, in Swiss patents 642 564, 547 120 or 578 370, all have the disadvantage that they tend to become blocked when using fluids containing or consisting of solid particles. Such fluids can e.g. consist of different granules which are to be mixed homogeneously with one another or be liquids which contain fibers or other solid particles, for example.

Derartige Fälle kommen beispielsweise in der kommunalen Abwasseraufbereitung, z.B. beim Einmischen von Chemikalien in Schlamm, in der Papierindustrie oder auch in der Nahrungsmittelindustrie, z.B. beim Einmischen von Fruchtstückchen in Joghurt vor.Such cases occur, for example, in municipal wastewater treatment, e.g. when mixing chemicals in sludge, in the paper industry or also in the food industry, e.g. when mixing fruit pieces in yogurt.

Aus der US-A-3733057 ist auch eine Mischvorrichtung bekannt wobei die Mischeinrichtung aus einem rohrartigen Gehäuse mit mindestens einem darin angeordneten Mischelement besteht, welches zwei oder mehr, gegenüber der Längsachse des Gehäuses geneigte Stege aufweist, wobei die Aussenkontur der Stege der Gehäusewand angepasst ist.A mixing device is also known from US-A-3733057, the mixing device consisting of a tubular housing with at least one mixing element arranged therein, which has two or more webs inclined with respect to the longitudinal axis of the housing, the outer contour of the webs being adapted to the housing wall .

Bei dieser Mischvorrichtung handelt es sich im wessentlichen um einem Mischer vom sogennanten "KENICS-NISCHER-TYP" bei de, aber ein Zentrum ein Durchgangs-Kanal vorhanden ist.This mixing device is essentially a mixer of the so-called "KENICS-NISCHER-TYPE", but there is a through channel in the center.

Der Erfindung liegt die Aufgabe zugrunde, für Medien der vorstehend genannten Art, d.h. selbst aus Stückgut bestehende oder Stückgut enthaltende Fluide eine verstopfungsfreie, statische Mischvorrichtung zu schaffen, welche darüber hinaus eine homogene Vermischung bei annehmbarem Druckverlust sicherstellt.The invention is based, for media of the type mentioned above, i. even fluids consisting of piece goods or containing piece goods to create a blockage-free, static mixing device which also ensures homogeneous mixing with an acceptable pressure loss.

Diese Aufgabe wird erfindungsgemäss mit Merkmalen gemäss dem Kennzeichen das Patentanspruchs 1 gelöst.This object is achieved with features according to the characterizing part of patent claim 1.

Die erfindungsgemässe Ausbildung einer statischen Mischvorrichtung verhindert mit einfachen Mitteln das Absetzen oder Verfangen von Feststoffteilchen zwischen Stegen und Mantelrohrwand bzw. zwischen sich kreuzenden Stegen, so dass ein einwandfreies Vermischen in der Vorrichtung durchgeführt werden kann.The design according to the invention of a static mixing device prevents the settling or catching of solid particles between the webs and casing wall or between crossing webs with simple means, so that a perfect mixing can be carried out in the device.

Die äusseren Stege bzw. die einen Enden der inneren Stege können beispielsweise mit der Rohrwand verschweisst oder verlötet werden.The outer webs or the one ends of the inner webs can be welded or soldered to the tube wall, for example.

Der Vorrichtungsquerschnitt kann sowohl kreisförmig sein als auch eine andere Kontur aufweisen, z.B. ein Rechteck sein.The device cross section can be both circular and have a different contour, e.g. be a rectangle.

Zu einem verbesserten Strömungsverhalten in bezug auf eine gute Ablösung an den Stegenden, können die Stegquerschnitte gegen die freien Enden zu sich verjüngen.To improve flow behavior with regard to good detachment at the web ends, the web cross sections can taper towards the free ends.

Die Querschnitte sowie die Längsschnittformen weisen vorteilhaft strömungsgünstige Konturen auf, z.B. rechteckig, eliptisch oder halbkreisförmig. Der Winkel zwischen den Stegen und der Rohrachse liegt worteilhaft im Bereich von 30 bis 60°, insbesondere 45 und 30°.The cross sections and the longitudinal section shapes advantageously have aerodynamic contours, e.g. rectangular, elliptical or semicircular. The angle between the webs and the tube axis is advantageously in the range from 30 to 60 °, in particular 45 and 30 °.

Bei Anordnung von mehreren Mischelementen in einer Mischvorrichtung kann eine vorteilhafte Weiterbildung der Erfindung darin bestehen, dass die aufeinanderfolgenden. Mischelemente jeweils um einen Winkel, insbesondere von 90° gegeneinander versetzt im Gehäuse angeordnet sind. Hierdurch wird eine räumliche Homogenität erzielt.If several mixing elements are arranged in a mixing device, an advantageous development of the invention can consist in that the successive ones. Mixing elements are each arranged at an angle, in particular offset by 90 °, in the housing. This ensures spatial homogeneity.

Vorteilhafte Anwendungen, die bereits experimentell erprobt worden sind, bestehen z.B. darin, dass eingefärbtes und nicht eingefärbtes Kunststoffgranulat durch eine Fall-Leitung in die Mischvorrichtung eingeleitet wird. Bei der Mischung kann eine gleichmässige Farbverteilung erzielt werden.Advantageous applications that have already been experimentally tested are e.g. in that colored and non-colored plastic granulate is introduced into the mixing device through a drop pipe. When mixing, an even color distribution can be achieved.

Eine andere Anwendung kann z.B. im dem Einmischen von Flockungs-Chemikalien in Sekundär-Klärschlamm vor einem Zentrifugaldekanter eines kommunalen Klärwerks zur Schlammentwässerung bestehen. Durch den Einbau eines erfindungsgemässen Mischers wird der für eine wirksame Nutzung der Chemikalienmenge gestellten Forderung nach rascher und gleichmässiger Vermischung Rechnung getragen.Another application can e.g. consist of mixing flocculation chemicals in secondary sewage sludge in front of a centrifugal decanter of a municipal sewage treatment plant for sludge dewatering. The installation of a mixer according to the invention takes into account the requirement for an efficient use of the quantity of chemicals for rapid and uniform mixing.

Die Erfindung wird im folgenden anhand von Ausführungsbeispielen erläutert.

  • Fig. 1 zeigt in perspektivischer Darstellungsweise ein zylindrisches Mantelrohr, in welchem zwei Mischelemente angeordnet sind,
  • Fig. 2a-2d je einen Querschnitt durch ein solches Mischelement, und zwar in vier jeweils um 90° gegeneinander verschwenkten Stellungen.
  • Fig. 3 und 4 zeigen einen Querschnitt bzw. einen Längsschnitt durch eine abgewandelte Form eines Mischelementes.
The invention is explained below using exemplary embodiments.
  • 1 shows a perspective representation of a cylindrical jacket tube in which two mixing elements are arranged,
  • Fig. 2a-2d each have a cross section through such a mixing element, in four positions pivoted by 90 ° relative to each other.
  • 3 and 4 show a cross section and a longitudinal section through a modified form of a mixing element.

Gemäss Fig. 1 sind in einem Mantelrohr 1 zwei gegeneinander um 90° verschwenkte Mischelemente angeordnet. Hierbei besteht jedes Mischelement aus drei Stegen 2a bis 2c, wobei zwischen den sich kreuzenden Stegen ein Zwischenraum frei bleibt, wie aus den Fig. 2a bis 2d deutlich hervorgeht.1, two mixing elements pivoted relative to one another by 90 ° are arranged in a casing tube 1. Here, each mixing element consists of three webs 2a to 2c, with a space remaining between the crossing webs, as can be clearly seen from FIGS. 2a to 2d.

Es kann zweckmässig sein, an den Kreuzungsstellen nutenartige Einschnürungen vorzusehen, um den freien Zwischenraum zu vergrössern.It may be expedient to provide groove-like constrictions at the crossing points in order to enlarge the free space.

Zwar handelt es sich bei der in den Fig. 1 bis 2d dargestellten Ausführungsform der Erfindung um eine besonders vorteilhafte Ausbildung, jedoch ist es grundsätzlich auch möglich, je nach dem Prozess, in welchen die Mischvorrichtung eingesetzt werden soll, die Mischvorrichtung mit mehreren Stegen auszubilden. In Fig. 3 und 4 ist ein Mischelement dargestellt, welches in einem Rohr 3 angeordnet ist und das aus zwei äusseren Stegen 4a und 4c und inneren Stegen 4b, 4d und 4e besteht.Although the embodiment of the invention shown in FIGS. 1 to 2d is a particularly advantageous embodiment, it is in principle also possible, depending on the process in which the mixing device is to be used, to design the mixing device with a plurality of webs. 3 and 4, a mixing element is shown, which is arranged in a tube 3 and which consists of two outer webs 4a and 4c and inner webs 4b, 4d and 4e.

Claims (6)

1. A static mixing device for fluids containing or consisting of solid particles, the mixer comprising a tubular casing (1) having in it at least one mixing element having two or more webs which are at an inclination to the casing longitudinal axis, the outer contour of the webs being adapted to the casing wall, characterised in that each mixing element comprises at least three webs (2a, 2b, 2c) crossing adjacent webs, in that adjacent webs (2a/ 2b, 2b/2c) of the mixing element are directed in substantially opposite directions with respect to the cross-section of the tubular casing (1), in that the outer edges of the outer webs (2a, 2c), and one end of the at least one inner web (2b) are connected gaplessly to the wall of the casing (1), in that the at least one web (2b) is spaced at its other end from its opposite wall of the casing, and in that adjacent webs (2a/2b, 2b/2c) have a clear gap at their mutual crossing places.
2. A static mixing device according to claim 1, characterised in that the mixing element comprises a number of, preferably an odd number of, inner webs (4b, 4d, 4e).
3. A static mixing device according to claim 1 or 2 characterised in that the inner web or inner webs (4b, 4d, 4e) narrow towards their free end.
4. A static mixing device having a number of mixing elements according to any one of claims 1 to 3, characterised in that consecutive mixing elements are so arranged in the tubular casing (1) as each to be at an angle, preferably a 90° offset, from one another.
5. A static mixing device according to any one of claims 1 to 4, characterised in that the webs (2a, 2b, 2c) are formed with recessing near their places of crossing adjacent webs (2a/2b, 2b/2c).
6. A static mixing device according to any one of claims 1 to 5, characterised in that the webs (2a, 2b, 2c) are of flat constructon.
EP86116622A 1985-12-11 1986-11-29 Static mixer for fluids containing or composed of solid particles Expired - Lifetime EP0226879B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86116622T ATE52939T1 (en) 1985-12-11 1986-11-29 STATIC MIXING DEVICE FOR FLUIDS CONTAINING OR CONSISTING OF SOLID PARTICULATES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH5282/85 1985-12-11
CH5282/85A CH669336A5 (en) 1985-12-11 1985-12-11

Publications (2)

Publication Number Publication Date
EP0226879A1 EP0226879A1 (en) 1987-07-01
EP0226879B1 true EP0226879B1 (en) 1990-05-23

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EP86116622A Expired - Lifetime EP0226879B1 (en) 1985-12-11 1986-11-29 Static mixer for fluids containing or composed of solid particles

Country Status (11)

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US (1) US4758098A (en)
EP (1) EP0226879B1 (en)
JP (1) JPH0817927B2 (en)
AT (1) ATE52939T1 (en)
AU (1) AU601384B2 (en)
CA (1) CA1283652C (en)
CH (1) CH669336A5 (en)
DE (1) DE3671386D1 (en)
DK (1) DK167177B1 (en)
ES (1) ES2002196A6 (en)
FI (1) FI86808C (en)

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Also Published As

Publication number Publication date
CH669336A5 (en) 1989-03-15
JPS62140631A (en) 1987-06-24
FI86808C (en) 1992-10-26
EP0226879A1 (en) 1987-07-01
CA1283652C (en) 1991-04-30
ATE52939T1 (en) 1990-06-15
ES2002196A6 (en) 1988-07-16
DE3671386D1 (en) 1990-06-28
FI863868A (en) 1987-06-12
AU601384B2 (en) 1990-09-13
DK167177B1 (en) 1993-09-13
DK424586A (en) 1987-06-12
AU6638586A (en) 1987-06-18
FI863868A0 (en) 1986-09-25
JPH0817927B2 (en) 1996-02-28
FI86808B (en) 1992-07-15
DK424586D0 (en) 1986-09-04
US4758098A (en) 1988-07-19

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