EP0800857A1 - Mixer tube for low viscosity fluids - Google Patents

Mixer tube for low viscosity fluids Download PDF

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Publication number
EP0800857A1
EP0800857A1 EP96810224A EP96810224A EP0800857A1 EP 0800857 A1 EP0800857 A1 EP 0800857A1 EP 96810224 A EP96810224 A EP 96810224A EP 96810224 A EP96810224 A EP 96810224A EP 0800857 A1 EP0800857 A1 EP 0800857A1
Authority
EP
European Patent Office
Prior art keywords
mixing
tube
bottleneck
mixing tube
gap
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.)
Granted
Application number
EP96810224A
Other languages
German (de)
French (fr)
Other versions
EP0800857B1 (en
Inventor
Markus Fleischli
Gottlieb Schneider
Marc Bruno Dr. Wehrli
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
Priority to ES96810224T priority Critical patent/ES2203673T3/en
Priority to AT96810224T priority patent/ATE246036T1/en
Priority to EP96810224A priority patent/EP0800857B1/en
Priority to DE59610627T priority patent/DE59610627D1/en
Priority to TW086101299A priority patent/TW358039B/en
Priority to JP9036291A priority patent/JPH09276678A/en
Priority to US08/808,380 priority patent/US5813762A/en
Priority to KR1019970006982A priority patent/KR100481930B1/en
Priority to CA002199332A priority patent/CA2199332C/en
Priority to MXPA/A/1997/002575A priority patent/MXPA97002575A/en
Priority to PL97319395A priority patent/PL182950B1/en
Priority to CZ19971091A priority patent/CZ291563B6/en
Priority to BR9701784-1A priority patent/BR9701784A/en
Priority to CN97109584A priority patent/CN1078817C/en
Publication of EP0800857A1 publication Critical patent/EP0800857A1/en
Application granted granted Critical
Publication of EP0800857B1 publication Critical patent/EP0800857B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • 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 mixing tube for low-viscosity fluids, in particular for fluids with suspended solids, according to the preamble of claim 1.
  • a static mixing device is known with which fluids containing solid particles can be mixed without causing blockages.
  • This device comprises mixing elements in a tube, each consisting of two outer webs and at least one inner web. The webs are connected at one end or sides to the housing without a gap, while their other ends end at a distance from the pipe wall. Adjacent webs intersect, leaving a space at each intersection. The mixing takes place essentially within the mixing elements by crosswise deflection of individual partial flows.
  • the object of the invention is to provide a mixing tube with static internals, which in terms of known static mixing device is cheaper to produce. This object is achieved by the mixing tube defined in claim 1, in which the mixing takes place due to the bottlenecks mentioned in the claim and the mixing sections following the bottlenecks. Such a mixing device can also be used for low-viscosity liquids that do not contain any solids.
  • the mixing tube according to the invention for low-viscosity fluids contains plate-shaped elements which partially cover its cross section at one or at individual points on the tube.
  • the bottlenecks left open by the elements each comprise at least one gap-shaped area, with a longitudinal extent of this gap, which runs from pipe wall to pipe wall through the pipe axis or from the pipe wall through the pipe axis to a second partial area.
  • the gap forms an angle with the tube axis in the range between approximately 20 and 60 °, preferably between 35 and 45 °.
  • a mixing section is provided in the direction of flow.
  • the bottleneck or bottlenecks of the mixing device according to the invention are shaped and arranged in such a way that two opposing vortices form in the flowing fluid when it passes through a bottleneck. Partial mixing occurs in the vortices while flowing through the mixing section. Compared to the known mixing device, fewer mixing elements and only two webs per mixing element are required in order to achieve a largely equally good mixing effect. However, a longer pipe is required. Furthermore, the mixing device according to the invention causes a lower pressure loss.
  • the dependent claims 2 to 11 relate to advantageous embodiments of the mixing tube according to the invention.
  • Claim 12 relates to the use of the mixing tube.
  • FIGS. 1 and 2 represent a mixing tube 1 according to the invention for low-viscosity fluids.
  • the tube wall 10 is only indicated by dash-dotted lines.
  • the circular tube has a diameter D.
  • the mixing tube 1 contains plate-shaped elements 2 as internals, which partially cover its cross section at individual points of the tube 1 and thus create bottlenecks 3.
  • the elements 2 are arranged in elliptical surfaces with the main axes d and e.
  • the bottleneck 3 left free in the elements 2 comprises two sections 31 and 32: a wide gap 31, which extends from the pipe wall 10 through the pipe axis c to the second section 32 along the axis e, and a flow opening 32 adjacent to the pipe wall 10 of an elongated, here crescent-like shape, which is arranged transversely to the first portion 31.
  • the shape of the second partial area 32 can also be lenticular, for example.
  • the axis e (or the gap 31) forms an angle ⁇ with the tube axis c, which lies in the range between approximately 20 and 60 °, preferably between 35 and 45 °.
  • the second partial area 32 is arranged downstream of the gap 31.
  • the open area of the bottleneck 3 is around 50-70% of the pipe cross-sectional area, with the gap being assigned around 60-70% of the open area.
  • the plate-shaped elements 2 of a bottleneck 3 form an arrangement with two segments 21 and 22.
  • the edges of these segments essentially each comprise the following sections: an edge piece a with the shape of an elliptical arc, which adjoins the tube wall 10; a straight edge piece s which forms a boundary with the gap 31; and an edge piece b which adjoins the second partial area 32 of the bottleneck 3.
  • the elliptical edge can be approximated by straight pieces, for example. Instead of the straight edge piece s there can also be a curved one.
  • the two segments 21 and 22 are connected to one another by a narrow web 23, which lies on the border between the two partial areas 31 and 32 of the bottleneck 3.
  • This web 23 results in a stabilization which is favorable in terms of construction and which allows a smaller plate thickness to be selected for the plate-shaped elements 2 than if the web 23 were not present.
  • the flowing fluid is indicated in Figure 1 by arrows 5, 5 '.
  • the bottleneck 3 induces two opposing vortices in the flow, which are indicated in the projection onto a cross-sectional area with arrows 6, 6 '.
  • the gap 31 is essentially trapezoidal (corner points A, B, B 'and A'); it widens towards the second section 32 of the bottleneck 3. With this gap shape, an optimal pair of vertebrae 6, 6 'is created. So that there are two vortices of equal strength, the bottleneck 3 is mirror-symmetrical; the plane of symmetry lies on the tube axis c.
  • the plate-shaped elements 2 assigned to a bottleneck 3 are shown in the exemplary embodiment in FIGS arranged on one level. They can be made from a piece of sheet metal together with the connecting web 23. 3 shows how these elements 2 can be cut out of a strip of sheet metal to save material.
  • the plate-shaped elements 2 can also be curved or bent instead of just.
  • At least two bottlenecks 3 are provided in the mixing tube 1, with a bottleneck 3 ′ adjacent to a first bottleneck 3 and located downstream of the mixing section 4 at a distance m of approximately 3 to 5 tube diameters D.
  • the free space between adjacent bottlenecks 3, 3 'thus has a length of around 2 to 4 pipe diameters D.
  • the gaps 31 of adjacent bottlenecks 3, 3 ' are arranged transversely to one another.
  • FIGS. 4 to 8 represent further embodiments of possible bottlenecks 3.
  • the two segments 21 and 22, which have the same shape, are arranged at an angle to one another.
  • the shape of the segment 21 or 22 can be seen in Fig.5.
  • the segments 21 and 22 can of course also be connected by a web 23 - for example as shown in dashed lines.
  • Figures 6 and 7 show bottlenecks 3 for mixing tubes 1 according to the invention, the cross sections of which are square or rectangular. 6 additionally shows that a web 23 can be arranged at a different location than at the boundary between the two partial areas of the pass 3.
  • the web 23 can be, for example, a rod with a circular cross section.
  • the fifth exemplary embodiment according to FIG. 8 shows a bottleneck 3, which only consists of a gap-shaped area 31.
  • the area 31 can be trapezoidal (with two curved sides AA ', BB') and can widen in or against the flow direction.
  • the mixing tube 1 according to the invention can be used to mix a fluid with suspended solids. This use is particularly advantageous if the solids are fibrous.

Abstract

The static mixing tube (1) is suitable for low viscosity fluids, especially containing suspended solids, and has plates (2) in individual locations of the tube, each partly covering the cross section. Through the plates, open narrow passages (3) each include a gap region (31) running from wall to wall through the tube axis (c), or running from wall to wall though the tube axis to a second partial region (32). The gap encloses an angle of 20-60 degrees , preferably 35-45 degrees with the tube axis. There is also a mixing length (4).

Description

Die Erfindung betrifft ein Mischrohr für niedrigviskose Fluide, insbesondere für Fluide mit suspendiert enthaltenen Feststoffen, gemäss Oberbegriff von Anspruch 1.The invention relates to a mixing tube for low-viscosity fluids, in particular for fluids with suspended solids, according to the preamble of claim 1.

Aus der CH-PS 669 336 (= P.6005) ist eine statische Mischvorrichtung bekannt, mit der Feststoffteilchen enthaltende Fluide vermischt werden können, ohne dass Verstopfungen entstehen. Diese Vorrichtung umfasst Mischelemente in einem Rohr, die jeweils aus zwei äusseren Stegen und mindestens einem inneren Steg bestehen. Die Stege sind an ihren einen Enden beziehungsweise Seiten mit dem Gehäuse spaltfrei verbunden, während ihre anderen Enden in einem Abstand vor der Rohrwand enden. Benachbarte Stege kreuzen sich, wobei an jeder Kreuzungsstelle ein Zwischenraum frei bleibt. Die Mischung erfolgt im wesentlichen innerhalb der Mischelemente durch ein kreuzweises Umlenken einzelner Teilströme.From CH-PS 669 336 (= P.6005) a static mixing device is known with which fluids containing solid particles can be mixed without causing blockages. This device comprises mixing elements in a tube, each consisting of two outer webs and at least one inner web. The webs are connected at one end or sides to the housing without a gap, while their other ends end at a distance from the pipe wall. Adjacent webs intersect, leaving a space at each intersection. The mixing takes place essentially within the mixing elements by crosswise deflection of individual partial flows.

Aufgabe der Erfindung ist es, ein Mischrohr mit statischen Einbauten zu schaffen, das hinsichtlich der bekannten statischen Mischvorrichtung kostengünstiger herstellbar ist. Diese Aufgabe wird durch das in Anspruch 1 definierte Mischrohr gelöst, bei dem die Mischung aufgrund der im Anspruch genannten Engpässe und der an die Engpässe anschliessenden Mischstrecken erfolgt. Eine derartige Mischvorrichtung ist auch für niedrigviskose Flüssigkeiten verwendbar, die keine Feststoffe enthalten.The object of the invention is to provide a mixing tube with static internals, which in terms of known static mixing device is cheaper to produce. This object is achieved by the mixing tube defined in claim 1, in which the mixing takes place due to the bottlenecks mentioned in the claim and the mixing sections following the bottlenecks. Such a mixing device can also be used for low-viscosity liquids that do not contain any solids.

Das erfindungsgemässe Mischrohr für niedrigviskose Fluide enthält plattenförmige Elemente, die an einer oder an einzelnen Stellen des Rohrs dessen Querschnitt teilweise abdecken. Die durch die Elemente freigelassenen Engpässe umfassen jeweils mindestens einen spaltförmigen Bereich, mit einer Längserstreckung dieses Spalts, die von Rohrwand zu Rohrwand durch die Rohrachse oder von der Rohrwand durch die Rohrachse zu einem zweiten Teilbereich verläuft. Der Spalt schliesst mit der Rohrachse einen Winkel im Bereich zwischen rund 20 und 60°, vorzugsweise zwischen 35 und 45°, ein. Nach dem Engpass ist in Strömungsrichtung eine Mischstrecke vorgesehen.The mixing tube according to the invention for low-viscosity fluids contains plate-shaped elements which partially cover its cross section at one or at individual points on the tube. The bottlenecks left open by the elements each comprise at least one gap-shaped area, with a longitudinal extent of this gap, which runs from pipe wall to pipe wall through the pipe axis or from the pipe wall through the pipe axis to a second partial area. The gap forms an angle with the tube axis in the range between approximately 20 and 60 °, preferably between 35 and 45 °. After the bottleneck, a mixing section is provided in the direction of flow.

Der Engpass oder die Engpässe der erfindungsgemässen Mischvorrichtung sind derart geformt und angeordnet, dass in dem strömenden Fluid beim Durchtritt durch einen Engpass sich zwei gegenläufige Wirbel ausbilden. Während des Durchströmens der Mischstrecke ergibt sich in den Wirbeln eine teilweise Durchmischung. Verglichen mit der bekannten Mischeinrichtung sind weniger Mischelemente und pro Mischelement jeweils nur zwei Stege nötig, um eine weitgehend gleich gute Mischwirkung zu erzielen. Allerdings wird ein längeres Rohr benötigt. Ferner verursacht die erfindungsgemässe Mischvorrichtung einen niedrigeren Druckverlust.The bottleneck or bottlenecks of the mixing device according to the invention are shaped and arranged in such a way that two opposing vortices form in the flowing fluid when it passes through a bottleneck. Partial mixing occurs in the vortices while flowing through the mixing section. Compared to the known mixing device, fewer mixing elements and only two webs per mixing element are required in order to achieve a largely equally good mixing effect. However, a longer pipe is required. Furthermore, the mixing device according to the invention causes a lower pressure loss.

Die abhängigen Ansprüche 2 bis 11 betreffen vorteilhafte Ausführungsformen des erfindungsgemässen Mischrohrs. Der Anspruch 12 bezieht sich auf die Verwendung des Mischrohrs.The dependent claims 2 to 11 relate to advantageous embodiments of the mixing tube according to the invention. Of the Claim 12 relates to the use of the mixing tube.

Nachfolgend wird die Erfindung anhand der Zeichnungen erläutert. Es zeigen:

Fig. 1
ein erstes Ausführungsbeispiel der Einbaute eines erfindungsgemässen Mischrohrs mit einem kreisförmigen Rohrquerschnitt,
Fig. 2
zwei benachbarte Einbauten des Typs gemäss Fig.1,
Fig. 3
mehrere, aus einem Blechstreifen herausgeschnittene Einbauten,
Fig. 4
ein zweites Ausführungsbeispiel,
Fig. 5
ein Segment zu der Einbaute der Fig.4,
Fig. 6
ein drittes Ausführungsbeispiel, nämlich ein Rohr mit rechteckigem Querschnitt,
Fig. 7
eine Variante zu dem Beispiel der Fig.6 und
Fig. 8
ein fünftes Ausführungsbeispiel.
The invention is explained below with reference to the drawings. Show it:
Fig. 1
a first embodiment of the installation of a mixing tube according to the invention with a circular tube cross section,
Fig. 2
two adjacent internals of the type shown in FIG. 1,
Fig. 3
several internals cut out of a metal strip,
Fig. 4
a second embodiment,
Fig. 5
a segment to the built-in of Figure 4,
Fig. 6
a third embodiment, namely a tube with a rectangular cross section,
Fig. 7
a variant of the example of Fig.6 and
Fig. 8
a fifth embodiment.

Die Figuren 1 und 2 stellen ein erfindungsgemässes Mischrohr 1 für niedrigviskose Fluide dar. Die Rohrwand 10 ist nur strichpunktiert angedeutet. Das kreisförmige Rohr hat einen Durchmesser D. Das Mischrohr 1 enthält plattenförmige Elemente 2 als Einbauten, die an einzelnen Stellen des Rohrs 1 dessen Querschnitt teilweise abdecken und so Engpässe 3 herstellen. Die Elemente 2 sind in elliptischen Flächen mit den Hauptachsen d und e angeordnet.FIGS. 1 and 2 represent a mixing tube 1 according to the invention for low-viscosity fluids. The tube wall 10 is only indicated by dash-dotted lines. The circular tube has a diameter D. The mixing tube 1 contains plate-shaped elements 2 as internals, which partially cover its cross section at individual points of the tube 1 and thus create bottlenecks 3. The elements 2 are arranged in elliptical surfaces with the main axes d and e.

Der in den Elementen 2 freigelassene Engpass 3 umfasst zwei Teilbereiche 31 und 32: einen breiten Spalt 31, der sich von der Rohrwand 10 durch die Rohrachse c zu dem zweiten Teilbereich 32 längs der Achse e erstreckt, und eine an die Rohrwand 10 angrenzende Durchflussöffnung 32 von einer länglichen, hier halbmondähnlichen Form, die quer zu dem ersten Teilbereich 31 angeordnet ist. Die Form des zweiten Teilbereichs 32 kann auch beispielsweise linsenförmig sein.The bottleneck 3 left free in the elements 2 comprises two sections 31 and 32: a wide gap 31, which extends from the pipe wall 10 through the pipe axis c to the second section 32 along the axis e, and a flow opening 32 adjacent to the pipe wall 10 of an elongated, here crescent-like shape, which is arranged transversely to the first portion 31. The shape of the second partial area 32 can also be lenticular, for example.

Die Achse e (oder der Spalt 31) schliesst mit der Rohrachse c einen Winkel ϕ ein, der im Bereich zwischen rund 20 und 60°, vorzugsweise zwischen 35 und 45°, liegt. Der zweite Teilbereich 32 ist stromabwärts nach dem Spalt 31 angeordnet. Nach dem Engpass 3 folgt eine Mischstrecke 4.The axis e (or the gap 31) forms an angle ϕ with the tube axis c, which lies in the range between approximately 20 and 60 °, preferably between 35 and 45 °. The second partial area 32 is arranged downstream of the gap 31. After the bottleneck 3, a mixing section 4 follows.

In der Normalprojektion auf einen Rohrquerschnitt beträgt die offene Fläche des Engpasses 3 rund 50 - 70% der Rohrquerschnittsfläche, wobei dem Spalt rund 60 - 70% der offenen Fläche zugeordnet ist. Bei diesen Verhältnissen ist der Materialbedarf gering und die Strömung des zu mischenden Fluids erleidet lediglich kleine Druckverluste.In the normal projection onto a pipe cross-section, the open area of the bottleneck 3 is around 50-70% of the pipe cross-sectional area, with the gap being assigned around 60-70% of the open area. With these conditions, the material requirement is low and the flow of the fluid to be mixed suffers only small pressure drops.

Die plattenförmigen Elemente 2 eines Engpasses 3 bilden eine Anordnung mit zwei Segmenten 21 und 22. Die Ränder dieser Segmente umfassen im wesentlichen jeweils folgende Teilstücke: ein Randstück a mit der Form eines elliptischen Bogens, das an die Rohrwand 10 angrenzt; ein gerades Randstück s, das eine Grenze zum Spalt 31 bildet; und ein Randstück b, das an den zweiten Teilbereich 32 des Engpasses 3 angrenzt. Zwischen der Rohrwand 10 und dem bogenförmigen Rand a kann sich eine kleine Lücke befinden, die an einzelnen Stellen durch Verbindungsmittel, beispielsweise Schweissmaterial, überbrückt sind. Der elliptische Rand kann beispielsweise durch gerade Stücke angenähert sein. Anstelle des geraden Randstücks s kann auch ein gekrümmtes vorliegen.The plate-shaped elements 2 of a bottleneck 3 form an arrangement with two segments 21 and 22. The edges of these segments essentially each comprise the following sections: an edge piece a with the shape of an elliptical arc, which adjoins the tube wall 10; a straight edge piece s which forms a boundary with the gap 31; and an edge piece b which adjoins the second partial area 32 of the bottleneck 3. There may be a small gap between the tube wall 10 and the arcuate edge a, which is made at individual points by connecting means, for example welding material. are bridged. The elliptical edge can be approximated by straight pieces, for example. Instead of the straight edge piece s there can also be a curved one.

Relativ gute Mischwirkungen erhält man auch, wenn die Segmente 21 und 22 stark verkürzt sind und die offene Fläche des Engpasses 75% beträgt. Für solche Segmente 21, 22 ist die Mischwirkung weniger gut; dafür ist der Druckverlust geringer. Dies gilt generell: grössere offene Fläche bedeutet einen geringen Druckverlust und umgekehrt.Relatively good mixing effects can also be obtained if the segments 21 and 22 are shortened considerably and the open area of the bottleneck is 75%. The mixing effect is less good for such segments 21, 22; but the pressure loss is less. This generally applies: a larger open area means less pressure loss and vice versa.

In der Ausführungsform der Figuren 1 und 2 sind die beiden Segmente 21 und 22 durch einen schmalen Steg 23 miteinander verbunden, der auf der Grenze zwischen den zwei Teilbereichen 31 und 32 des Engpasses 3 liegt. Mit diesem Steg 23 ergibt sich eine hinsichtlich der Konstruktion günstige Stabilisierung, die es erlaubt, für die plattenförmigen Elemente 2 eine kleinere Plattendicke zu wählen, als wenn der Steg 23 nicht vorhanden wäre.In the embodiment of FIGS. 1 and 2, the two segments 21 and 22 are connected to one another by a narrow web 23, which lies on the border between the two partial areas 31 and 32 of the bottleneck 3. This web 23 results in a stabilization which is favorable in terms of construction and which allows a smaller plate thickness to be selected for the plate-shaped elements 2 than if the web 23 were not present.

Das strömende Fluid ist in Fig.1 durch Pfeile 5, 5' angedeutet. Der Engpass 3 induziert in der Strömung zwei gegenläufige Wirbel, die in der Projektion auf eine Querschnittsfläche mit Pfeilen 6, 6' angedeutet sind.The flowing fluid is indicated in Figure 1 by arrows 5, 5 '. The bottleneck 3 induces two opposing vortices in the flow, which are indicated in the projection onto a cross-sectional area with arrows 6, 6 '.

Der Spalt 31 ist im wesentlichen trapezförmig (Eckpunkte A, B, B' und A'); er erweitert sich gegen den zweiten Teilbereich 32 des Engpasses 3 hin. Mit dieser Spaltform entsteht ein optimales Wirbelpaar 6, 6'. Damit sich zwei gleich starke Wirbel ergeben, ist der Engpass 3 spiegelsymmetrisch ausgebildet; die Symmetrieebene liegt auf der Rohrachse c.The gap 31 is essentially trapezoidal (corner points A, B, B 'and A'); it widens towards the second section 32 of the bottleneck 3. With this gap shape, an optimal pair of vertebrae 6, 6 'is created. So that there are two vortices of equal strength, the bottleneck 3 is mirror-symmetrical; the plane of symmetry lies on the tube axis c.

Die einem Engpass 3 zugeordneten plattenförmigen Elemente 2 sind beim Ausführungsbeispiel der Figuren 1 und 2 in einer Ebene angeordnet. Sie lassen sich zusammen mit dem Verbindungssteg 23 aus einem Stück Blech fertigen. Fig.3 zeigt, wie diese Elemente 2 materialsparend aus einem Streifen Blech ausgeschnitten werden können.The plate-shaped elements 2 assigned to a bottleneck 3 are shown in the exemplary embodiment in FIGS arranged on one level. They can be made from a piece of sheet metal together with the connecting web 23. 3 shows how these elements 2 can be cut out of a strip of sheet metal to save material.

Die plattenförmigen Elemente 2 können statt eben auch gekrümmt oder geknickt sein.The plate-shaped elements 2 can also be curved or bent instead of just.

Im Mischrohr 1 sind mindestens zwei Engpässe 3 vorgesehen, wobei jeweils ein zu einem ersten Engpass 3 benachbarter, stromabwärts liegender Engpass 3' ausserhalb der Mischstrecke 4 in einem Abstand m von rund 3 bis 5 Rohrdurchmessern D angeordnet ist. Der einbautenfreie Raum zwischen benachbarten Engpässen 3, 3' weist somit ein Länge von rund 2 bis 4 Rohrdurchmesser D auf. Die Spalte 31 benachbarter Engpässe 3, 3' sind quer zueinander angeordnet.At least two bottlenecks 3 are provided in the mixing tube 1, with a bottleneck 3 ′ adjacent to a first bottleneck 3 and located downstream of the mixing section 4 at a distance m of approximately 3 to 5 tube diameters D. The free space between adjacent bottlenecks 3, 3 'thus has a length of around 2 to 4 pipe diameters D. The gaps 31 of adjacent bottlenecks 3, 3 'are arranged transversely to one another.

Die Figuren 4 bis 8 stellen weitere Ausführungsformen möglicher Engpässe 3 dar. In Fig.4 sind die beiden Segmente 21 und 22, die gleich geformt sind, winkelig zueinander angeordnet. Die Form des Segments 21 bzw. 22 ist in Fig.5 zu sehen. Die Segmente 21 und 22 können selbstverständlich auch durch einen Steg 23 - beispielsweise wie gestrichelt dargestellt - verbunden sein.FIGS. 4 to 8 represent further embodiments of possible bottlenecks 3. In FIG. 4, the two segments 21 and 22, which have the same shape, are arranged at an angle to one another. The shape of the segment 21 or 22 can be seen in Fig.5. The segments 21 and 22 can of course also be connected by a web 23 - for example as shown in dashed lines.

Die Figuren 6 und 7 zeigen Engpässe 3 für erfindungsgemässe Mischrohre 1, deren Querschnitte quadratisch oder rechteckig sind. Fig.6 zeigt zusätzlich, dass ein Steg 23 an einer anderen Stelle als an der Grenze zwischen den beiden Teilbereichen des Enpasses 3 angeordnet sein kann. Der Steg 23 kann beispielsweise ein Stab mit kreisförmigem Querschnitt sein.Figures 6 and 7 show bottlenecks 3 for mixing tubes 1 according to the invention, the cross sections of which are square or rectangular. 6 additionally shows that a web 23 can be arranged at a different location than at the boundary between the two partial areas of the pass 3. The web 23 can be, for example, a rod with a circular cross section.

Das fünfte Ausführungsbeispiel gemäss Fig. 8 zeigt einen Engpass 3, der nur aus einem spaltförmigen Bereich 31 besteht. Der Bereich 31 kann trapezförmig sein (mit zwei gekrümmten Seiten AA', BB') und sich dabei in oder gegen die Strömungsrichtung erweitern.The fifth exemplary embodiment according to FIG. 8 shows a bottleneck 3, which only consists of a gap-shaped area 31. The area 31 can be trapezoidal (with two curved sides AA ', BB') and can widen in or against the flow direction.

Das erfindungsgemässe Mischrohr 1 kann das Mischen eines Fluids mit suspendiert enthaltenen Feststoffen verwendet werden. Besonders wenn die Feststoffe faserförmig sind, ist diese Verwendung vorteilhaft.The mixing tube 1 according to the invention can be used to mix a fluid with suspended solids. This use is particularly advantageous if the solids are fibrous.

Claims (12)

Mischrohr (1) für niedrigviskose Fluide, insbesondere für Fluide mit suspendiert enthaltenen Feststoffen, welches Mischrohr plattenförmige Elemente (2) enthält, die an einer oder an einzelnen Stellen des Rohrs dessen Querschnitt teilweise abdecken,
   dadurch gekennzeichnet, dass durch die Elemente freigelassene Engpässe (3) jeweils mindestens einen spaltförmigen Bereich (31) umfassen, mit einer Längserstreckung dieses Spalts (31), die von Rohrwand (10) zu Rohrwand durch die Rohrachse (c) oder von der Rohrwand durch die Rohrachse (c) zu einem zweiten Teilbereich (32) verläuft, wobei der Spalt mit der Rohrachse einen Winkel (ϕ) im Bereich zwischen rund 20 und 60°, vorzugsweise zwischen 35 und 45°, einschliesst, und dass ferner nach dem Engpass in Strömungsrichtung eine Mischstrecke (4) vorgesehen ist.Mixing tube (1) for low-viscosity fluids, in particular for fluids with suspended solids, which mixing tube contains plate-shaped elements (2) that partially cover the cross-section of one or at individual points of the tube,
characterized in that bottlenecks (3) left free by the elements each comprise at least one gap-shaped region (31), with a longitudinal extent of this gap (31), which runs from tube wall (10) to tube wall through the tube axis (c) or from the tube wall the pipe axis (c) extends to a second partial area (32), the gap with the pipe axis forming an angle (ϕ) in the range between approximately 20 and 60 °, preferably between 35 and 45 °, and that further after the bottleneck in Flow direction a mixing section (4) is provided. Mischrohr nach Anspruch 1, dadurch gekennzeichnet, dass der Engpass (3) zwei Teilbereiche umfasst, nämlich den Spalt (31), der durch die Rohrachse (c) zu dem zweiten Teilbereich (32) verläuft, und den zweiten Teilbereich, der eine an die Rohrwand (10) angrenzende Durchflussöffnung von einer länglichen, beispielsweise halbmondähnlichen oder linsenartigen Form bildet, wobei diese Durchflussöffnung quer zu dem ersten Teilbereich angeordnet ist, und dass die Mischstrecke (4) eine Länge (m) im Bereich von 1 bis 10 Rohrdurchmessern (D) aufweist.Mixing tube according to claim 1, characterized in that the bottleneck (3) comprises two sub-areas, namely the gap (31) which runs through the tube axis (c) to the second sub-area (32), and the second sub-area which one to the Pipe wall (10) adjoining flow opening of an elongated, for example crescent-like or lenticular shape, this flow opening being arranged transversely to the first partial area, and that the Mixing section (4) has a length (m) in the range of 1 to 10 pipe diameters (D). Mischrohr nach Anspruch 2, dadurch gekennzeichnet, dass die jeweils einer Engpassstelle (3) zugeordneten plattenförmigen Elemente (2) eine Anordnung mit zwei Segmenten (21, 22) bilden, wobei die Ränder dieser Segmente im wesentlichen jeweils folgende Teilstücke umfassen: ein Randstück (a), insbesondere in Form eines elliptischen Bogens, das dicht oder mit einem kleinen Abstand an die Rohrwand (10) angrenzt, ein Randstück (s), das eine Grenze zu dem Spalt (31) bildet, und ein Randstück (b), das an den zweiten Teilbereich (32) des Engpasses angrenzt.Mixing tube according to claim 2, characterized in that the plate-shaped elements (2) each associated with a bottleneck (3) form an arrangement with two segments (21, 22), the edges of these segments essentially each comprising the following sections: an edge piece (a ), in particular in the form of an elliptical arc, which adjoins the tube wall (10) closely or at a small distance, an edge piece (s) which forms a boundary with the gap (31), and an edge piece (b) which forms an borders the second section (32) of the bottleneck. Mischrohr nach Anspruch 3, dadurch gekennzeichnet, dass die beiden Segmente (21, 22) durch mindestens einen schmalen Steg (23) miteinander verbunden sind, wobei der oder ein Steg insbesondere auf der Grenze zwischen den zwei Teilbereichen (31, 32) des Enpasses (3) liegt.Mixing tube according to claim 3, characterized in that the two segments (21, 22) are connected to one another by at least one narrow web (23), the or a web in particular on the boundary between the two partial areas (31, 32) of the passport ( 3) lies. Mischrohr nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Spalt (31) im wesentlichen trapezförmig ist und sich in Strömungsrichtung erweitert.Mixing tube according to one of claims 1 to 4, characterized in that the gap (31) is substantially trapezoidal and widens in the direction of flow. Mischrohr nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Engpass (3) spiegelsymmetrisch ausgebildet ist, wobei die Symmetrieebene auf der Rohrachse (c) liegt.Mixing tube according to one of claims 1 to 5, characterized in that the bottleneck (3) is mirror-symmetrical, the plane of symmetry being on the tube axis (c). Mischrohr nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die dem Engpass (3) zugeordneten plattenförmigen Elemente (2) in einer Ebene angeordnet sind.Mixing tube according to one of claims 1 to 6, characterized in that the plate-shaped elements (2) assigned to the bottleneck (3) are arranged in one plane. Mischrohr nach den Ansprüchen 7 und 4, dadurch gekennzeichnet, dass die in einer Ebene angeordneten plattenförmigen Elemente (3) zusammen mit dem Verbindungssteg (23) aus einem Stück Blech gefertigt sind.Mixing tube according to claims 7 and 4, characterized in that the plate-shaped elements (3) arranged in one plane are made from a piece of sheet metal together with the connecting web (23). Mischrohr nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass mindestens zwei Engpässe (3, 3') vorgesehen sind, wobei jeweils der benachbarte stromabwärts liegende Engpass (3') ausserhalb der Mischstrecke (4) in einem Abstand (m) von rund 3 bis 5 Rohrdurchmessern (D) angeordnet ist oder der einbautenfreie Raum zwischen benachbarten Engpässen ein Länge von rund 2 bis 4 Rohrdurchmesser aufweist.Mixing tube according to one of claims 1 to 8, characterized in that at least two bottlenecks (3, 3 ') are provided, the adjacent downstream bottleneck (3') outside the mixing section (4) at a distance (m) of around 3 to 5 pipe diameters (D) is arranged or the built-in space between adjacent bottlenecks has a length of around 2 to 4 pipe diameters. Mischrohr nach Anspruch 9, dadurch gekennzeichnet, dass die Spalte (31) benachbarter Engpässe (3, 3') quer zueinander angeordnet sind.Mixing tube according to claim 9, characterized in that the gaps (31) of adjacent bottlenecks (3, 3 ') are arranged transversely to one another. Mischrohr nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass in der Normalprojektion auf einen Rohrquerschnitt die offene Fläche des Engpasses (3) rund 50 - 75% der Rohrquerschnittsfläche beträgt.Mixing tube according to one of claims 1 to 10, characterized in that in the normal projection onto a tube cross-section the open area of the bottleneck (3) is approximately 50-75% of the tube cross-sectional area. Verwendung eines Mischrohrs (1) gemäss einem der Ansprüche 1 bis 11 für das Mischen eines Fluids mit suspendiert enthaltenen Feststoffen, wobei insbesondere die Feststoffe faserförmig sind.Use of a mixing tube (1) according to one of claims 1 to 11 for mixing a fluid with suspended solids, the solids in particular being fibrous.
EP96810224A 1996-04-12 1996-04-12 Mixer tube for low viscosity fluids Expired - Lifetime EP0800857B1 (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
ES96810224T ES2203673T3 (en) 1996-04-12 1996-04-12 MIXING TUBE FOR LOW VISCOSITY FLUIDS.
AT96810224T ATE246036T1 (en) 1996-04-12 1996-04-12 MIXING TUBE FOR LOW VISCOSITY FLUIDS
EP96810224A EP0800857B1 (en) 1996-04-12 1996-04-12 Mixer tube for low viscosity fluids
DE59610627T DE59610627D1 (en) 1996-04-12 1996-04-12 Mixing tube for low-viscosity fluids
TW086101299A TW358039B (en) 1996-04-12 1997-02-04 Mixer tube for low viscosity fluids and use thereof
JP9036291A JPH09276678A (en) 1996-04-12 1997-02-20 Mixer pipe for low viscosity fluid
US08/808,380 US5813762A (en) 1996-04-12 1997-02-28 Mixer tube for low viscosity fluids
KR1019970006982A KR100481930B1 (en) 1996-04-12 1997-03-04 Low Viscosity Fluid Mixer Tubes
CA002199332A CA2199332C (en) 1996-04-12 1997-03-06 Mixer tube for low viscosity fluids
MXPA/A/1997/002575A MXPA97002575A (en) 1996-04-12 1997-04-09 Mixing pipe for viscosity fluids b
PL97319395A PL182950B1 (en) 1996-04-12 1997-04-09 Mixing tube for low-viscosity fluids
CZ19971091A CZ291563B6 (en) 1996-04-12 1997-04-10 Mixer tube for low-viscosity fluids
BR9701784-1A BR9701784A (en) 1996-04-12 1997-04-11 Mixing tube for low viscosity fluids
CN97109584A CN1078817C (en) 1996-04-12 1997-04-11 Pipe for mixing low viscosity liquid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96810224A EP0800857B1 (en) 1996-04-12 1996-04-12 Mixer tube for low viscosity fluids

Publications (2)

Publication Number Publication Date
EP0800857A1 true EP0800857A1 (en) 1997-10-15
EP0800857B1 EP0800857B1 (en) 2003-07-30

Family

ID=8225586

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96810224A Expired - Lifetime EP0800857B1 (en) 1996-04-12 1996-04-12 Mixer tube for low viscosity fluids

Country Status (13)

Country Link
US (1) US5813762A (en)
EP (1) EP0800857B1 (en)
JP (1) JPH09276678A (en)
KR (1) KR100481930B1 (en)
CN (1) CN1078817C (en)
AT (1) ATE246036T1 (en)
BR (1) BR9701784A (en)
CA (1) CA2199332C (en)
CZ (1) CZ291563B6 (en)
DE (1) DE59610627D1 (en)
ES (1) ES2203673T3 (en)
PL (1) PL182950B1 (en)
TW (1) TW358039B (en)

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DE19748383C2 (en) * 1997-11-03 2000-11-23 U & A Gmbh Static mixer
EP0918146A1 (en) 1997-11-19 1999-05-26 Sulzer Chemtech AG Apparatus for decomposing pollutants of exhaust gases by means of catalytic converters
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EP3479893A1 (en) 2017-11-06 2019-05-08 Sulzer Chemtech AG An improved mixer duct and a process of using it
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Also Published As

Publication number Publication date
ES2203673T3 (en) 2004-04-16
CN1167007A (en) 1997-12-10
DE59610627D1 (en) 2003-09-04
PL319395A1 (en) 1997-10-13
TW358039B (en) 1999-05-11
US5813762A (en) 1998-09-29
PL182950B1 (en) 2002-05-31
EP0800857B1 (en) 2003-07-30
CZ291563B6 (en) 2003-04-16
CA2199332A1 (en) 1997-10-12
KR100481930B1 (en) 2005-07-18
MX9702575A (en) 1997-10-31
CN1078817C (en) 2002-02-06
CZ109197A3 (en) 1997-10-15
KR970069108A (en) 1997-11-07
JPH09276678A (en) 1997-10-28
CA2199332C (en) 2000-11-21
ATE246036T1 (en) 2003-08-15
BR9701784A (en) 1999-10-19

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