EP1302236B1 - Pipe segment with a feeding port for an additiv - Google Patents

Pipe segment with a feeding port for an additiv Download PDF

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Publication number
EP1302236B1
EP1302236B1 EP02405807A EP02405807A EP1302236B1 EP 1302236 B1 EP1302236 B1 EP 1302236B1 EP 02405807 A EP02405807 A EP 02405807A EP 02405807 A EP02405807 A EP 02405807A EP 1302236 B1 EP1302236 B1 EP 1302236B1
Authority
EP
European Patent Office
Prior art keywords
pipe
accordance
pipe member
vane
conduit
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
EP02405807A
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German (de)
French (fr)
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EP1302236A1 (en
Inventor
Markus Fleischli
Peter Mathys
Albert Breiter
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Sulzer Chemtech AG
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Sulzer Chemtech AG
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Filing date
Publication date
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Priority to EP02405807A priority Critical patent/EP1302236B1/en
Publication of EP1302236A1 publication Critical patent/EP1302236A1/en
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Publication of EP1302236B1 publication Critical patent/EP1302236B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/4316—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod
    • 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
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
    • B01F25/3141—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit with additional mixing means other than injector 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
    • B01F25/4315—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being deformed flat pieces of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • 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
    • B01F25/431974—Support members, e.g. tubular collars, with projecting baffles fitted inside the mixing tube or adjacent to the inner wall

Definitions

  • the invention relates to a pipe section with a feed point for an additive or with several such feed points and with a static mixing element.
  • the invention also relates to a pipeline with the pipe section according to the invention and to uses of the pipe section.
  • the additives are mixed into a flowing low-viscosity fluid by means of the static mixing element.
  • the static mixing element consists of a pair of wings and a third wing which is arranged crosswise with respect to the pair of wings. Under wing is understood a plate-like body, which is flat or can be slightly curved, which has an elongated shape and which extends between a base and a narrow end.
  • the pipe piece according to the invention can in particular be a ring which can be clamped between flanges of upstream and downstream pipe parts.
  • Such an intermediate flange ring for metering and admixing an additive (or several additives) into a fluid stream is known, for example, from US Pat. No. 5,839,828.
  • the additive is fed via sockets into the interior of the ring, where it is mixed into the fluid flow under the action of a vortex-inducing orifice.
  • a Blending element with intersecting wings which does not have the present in the aperture symmetry to use.
  • the improved device should be designed in the form of a ring metering device, in which the admixing of the additive is carried out using a plurality of point feed points, wherein these feed points are positioned on an annular channel around the mixing element.
  • the object of the invention is to provide a piece of pipe for mixing one or more additives in a flowing low-viscosity fluid, wherein the pipe section includes a mixing element with intersecting wings and the additive feed takes place in a manner that is simpler than in said Ringdosier boots and without A loss in the quality of mixing is feasible.
  • This object is achieved by the defined in claim 1 piece of pipe.
  • the pipe section with a feed point for one or more such feed points comprises a pipe wall and a static mixing element.
  • the feed points are provided for introducing the additives into a flowing low-viscosity fluid.
  • the static mixing element consists of a pair of wings and a third wing.
  • the pair of wings which forms a constriction which deflects the flow of the fluid, is designed essentially mirror-symmetrically with respect to a center plane extending in the direction of the flow.
  • the third wing is arranged with respect to the wing pair in a crossing manner as well as in the region of the median plane. It has a rear side with respect to the flow, which extends from a base on the pipe wall to a downstream end. Each entry point is located on the back of the third wing.
  • the feed point is arranged on the rear side of the third wing.
  • the dependent claims 2 to 7 relate to advantageous embodiments of the inventive pipe section.
  • the claims 8 and 9 relate to a pipeline in which the pipe piece according to the invention is installed. A use is subject of claim 10.
  • FIGS 1 and 2 illustrate a pipe piece 1 according to the invention with a feed point 2 for an additive 20.
  • a cylindrical pipe wall 11 has an inlet side 13 for connection to an upstream pipe 3 and an outlet side 14 for connection to a downstream pipe 4.
  • the flow 10 'of a low-viscosity fluid 10 leads with a static mixing element 12, which is arranged downstream of the input side 13, the additive 20 is mixed into the fluid 10.
  • the mixing element 12 is made from a pair of wings 5 with wings 5a, 5b and a third wing 6.
  • the pair of wings 5, which forms a 10 'flow deflecting the flow 10' is formed with respect to a in the direction of the flow 10 'extending median plane 15 is substantially mirror-symmetrical.
  • the third wing 6 is located in the region of the median plane 15, through which it is cut along the dot-dash line 156.
  • the third wing 6 is arranged with respect to the pair of wings 5 in a crossing manner. It has, with respect to the flow 10 ', a back side 60 which extends from a base on the tube wall 11 to a downstream end and thereby forms an angle 61 of 30 ° to 60 ° lying in the median plane 15.
  • the feed point 2 is arranged on the rear side of the third wing 6.
  • the angle 61 preferably has a value of 40 ° to 50 °.
  • the feed point 2 comprises a connecting piece 2 'and a nozzle channel 21 leading through the pipe wall 11, which is in particular a bore.
  • An internal thread 22 is provided in the embodiment of FIG. 2 for connection to a conduit through which the additive 20 can be supplied.
  • the pipe wall 11 with the input side 13 and the output side 14 is formed as insects. Between a flange 31 of the upstream pipeline 3 and a flange 41 of a downstream pipeline 4, the insects 11 can be clamped.
  • the two flanges 31 and 41 can be connected by means of inserted in holes 32, screws, not shown, and clamp together.
  • the wings 5a, 5b of the pair 5 lie on two planes, which intersect at least approximately in the median plane 15 at a shallow angle ( ⁇ , see FIG. 7).
  • the wings are 5a, 5b at peripheral edges 51 a and 51 b without gaps on the pipe wall 11 at; they can be connected to the pipe wall 11.
  • the pipe wall 11 is shown with a shape in which the pipe cross-section is circular. This can also have other shapes.
  • Fig. 3 shows a second embodiment of the pipe section 1: the input side 13 is formed as an input-side flange 13 '; On the output side, a second flange 14 'is arranged, which can be connected to the downstream pipeline 4 via a flange 41.
  • This embodiment is suitable for large amounts of additive.
  • the feed point 2 is a tube with a relatively large diameter, which opens without a bottleneck in the interior of the tube wall 11.
  • the third wing 6 may be stiffened by means of a reinforcing rib 63.
  • the three wings 5a, 6, 5b (5b not visible) may be connected to a further reinforcement at the wing tips with a cross member 64. This reinforcement prevents the wings from swinging. It is also the input-side flange 13 'or the output-side flange 14' missing.
  • Fig. 4 shows a pipe section 1 with a specially designed mixing element 12.
  • the wings 5a, 6 and 5b are attached to a flat ring 7 or connected to such.
  • This ring 7 is tightly inserted between the flange 31 of the pipe 3 and the input side 13, preferably with seals 70 (only one shown).
  • the ring 7 may also be inserted into a groove (not shown), said groove forms a shallow recess on the end face 31 a of the flange 31.
  • a pipeline in which the pipe section 1 according to the invention is installed, comprises parts 3 and 4 which lie upstream and downstream of the installed pipe section 1. These parts 3 and 4 have the same or largely the same inner diameter D as the built-pipe section. 1
  • L length of the pipe section 114.
  • the diagram of FIG. 6 shows measurement results for three static mixers, wherein a mixing ratio of 1: 2000 (0.05%) has been selected:
  • the two points at the ends of the segment 9 are measured values for the pipe piece 1 according to the invention 91 points to point L / D, where a homogeneous additive distribution is achieved: L / D is approximately 2.5.
  • Corresponding measured values (circles) on the line 9 ' have been obtained for a ring feeder with sixteen feed points.
  • L / D is about 3.5 (arrow 91 '), so much bigger.
  • the tube piece 1 according to the invention which has a very simple construction, has an unexpectedly good mixing action, and that is unexpectedly good over other mixers for which good mixing effects have also been expected.
  • the tube piece according to the invention is suitable for mixing a fluid, low-viscosity additive 20 into a main flow 10 '.
  • the additive stream is usually not larger than the main stream. It is also possible to produce practically any desired small mixing ratios (for example 1: 10,000).
  • the diameter of the feed point must be adapted in each case.
  • Fig. 7 the flow conditions in the static mixing element 12 of the inventive pipe section 1 (wall 11) are shown, as they have resulted from flow calculations:
  • the inflowing fluid 10 is partially directed to the third wing 6.
  • the passing through the bottleneck of the wing pair 5 fluid 10 forms on the leeward sides of the wings 5a, 5b and 6 two counter-rotating vortexes 10a and 10b.
  • small vortices 10c and 10d are formed, which rapidly abate. Due to these flow conditions induced by the static mixing element, the experimentally confirmed excellent mixing effect results.
  • the pair of wings 5 forms a shallow angle ⁇ which is smaller than 180 ° and which has an advantageous effect on the formation of the vertebrae 10a and 10b.
  • Fig. 8 shows a device in which three inventive pipe sections 1, which have rectangular cross-sections, are arranged in parallel in a common channel.

Description

Die Erfindung betrifft ein Rohrstück mit einer Einspeisestelle für ein Additiv oder mit mehreren solchen Einspeisestellen und mit einem statischen Mischelement. Die Erfindung bezieht sich auch auf eine Rohrleitung mit dem erfindungsgemässen Rohrstück und auf Verwendungen des Rohrstücks. Die Additive werden in ein strömendes niedrigviskoses Fluid mittels dem statischen Mischelement eingemischt. Das statische Mischelement besteht aus einem Paar von Flügeln und einem dritten Flügel, der kreuzweise bezüglich dem Flügelpaar angeordnet ist. Unter Flügel ist dabei ein plattenartiger Körper verstanden, der flach ist oder auch leicht gebogen sein kann, der eine längliche Gestalt aufweist und der sich zwischen einer Basis und einem schmalen Ende erstreckt.The invention relates to a pipe section with a feed point for an additive or with several such feed points and with a static mixing element. The invention also relates to a pipeline with the pipe section according to the invention and to uses of the pipe section. The additives are mixed into a flowing low-viscosity fluid by means of the static mixing element. The static mixing element consists of a pair of wings and a third wing which is arranged crosswise with respect to the pair of wings. Under wing is understood a plate-like body, which is flat or can be slightly curved, which has an elongated shape and which extends between a base and a narrow end.

Das erfindungsgemässe Rohrstück kann insbesondere ein Ring sein, der zwischen Flanschen von stromaufwärts sowie stromabwärts liegenden Rohrleitungsteilen einspannbar ist. Ein derartiger Zwischenflanschring zum Zudosieren und Zumischen eines Additivs (oder mehrerer Additive) in einen Fluidstrom ist beispielsweise aus der US-A- 5 839 828 bekannt. Das Additiv wird über Stutzen in den Innenraum des Rings eingespeist, wo es unter der Einwirkung einer Wirbel induzierenden Blende in den Fluidstrom eingemischt wird. Zu einer Verbesserung der Mischgüte ist vorgeschlagen worden (siehe EP-A- 1 153 650, eine nicht vorveröffentlichte Anmeldung), anstelle der genannten Blende, die eine besondere Symmetrie aufweist, ein Mischelement mit sich kreuzenden Flügeln, welches die bei der Blende vorliegende Symmetrie nicht aufweist, zu verwenden. Ausserdem soll die verbesserte Einrichtung in Form einer Ringdosiereinrichtung ausgebildet sein, bei der die Einmischung des Additivs unter Verwendung einer Vielzahl von punktuellen Einspeisestellen durchgeführt wird, wobei diese Einspeisestellen auf einem ringförmigen Kanal um das Mischelement positioniert sind.The pipe piece according to the invention can in particular be a ring which can be clamped between flanges of upstream and downstream pipe parts. Such an intermediate flange ring for metering and admixing an additive (or several additives) into a fluid stream is known, for example, from US Pat. No. 5,839,828. The additive is fed via sockets into the interior of the ring, where it is mixed into the fluid flow under the action of a vortex-inducing orifice. To improve the mixing quality has been proposed (see EP-A-1 153 650, a non-prepublished application), instead of said aperture, which has a special symmetry, a Blending element with intersecting wings, which does not have the present in the aperture symmetry to use. In addition, the improved device should be designed in the form of a ring metering device, in which the admixing of the additive is carried out using a plurality of point feed points, wherein these feed points are positioned on an annular channel around the mixing element.

Aufgabe der Erfindung ist es, ein Rohrstück zum Einmischen eines oder mehrerer Additive in ein strömendes niedrigviskoses Fluid zu schaffen, wobei das Rohrstück ein Mischelement mit sich kreuzenden Flügeln enthält und die Additiveinspeisung in einer Weise erfolgt, die einfacher als bei der genannten Ringdosiereinrichtung und ohne eine Einbusse bei der Mischgüte durchführbar ist. Diese Aufgabe wird durch das im Anspruch 1 definierte Rohrstück gelöst.The object of the invention is to provide a piece of pipe for mixing one or more additives in a flowing low-viscosity fluid, wherein the pipe section includes a mixing element with intersecting wings and the additive feed takes place in a manner that is simpler than in said Ringdosiereinrichtung and without A loss in the quality of mixing is feasible. This object is achieved by the defined in claim 1 piece of pipe.

Das Rohrstück mit einer Einspeisestelle für ein Additiv oder mehreren solchen Einspeisestellen umfasst eine Rohrwand und ein statisches Mischelement. Die Einspeisestellen sind zum Einbringen der Additive in ein strömendes niedrigviskoses Fluid vorgesehen. Das statische Mischelement besteht aus einem Paar von Flügeln und einem dritten Flügel. Das Flügelpaar, das einen die Strömung des Fluids umlenkenden Engpass bildet, ist bezüglich einer in Richtung der Strömung sich erstreckenden Mittelebene im wesentlichen spiegelsymmetrisch ausgebildet. Der dritte Flügel ist bezüglich dem Flügelpaar in einer kreuzenden Weise sowie im Bereich der Mittelebene liegend angeordnet. Er weist bezüglich der Strömung eine Rückseite auf, die sich von einer Basis an der Rohrwand zu einem stromabwärts liegenden Ende erstreckt. Jede Einspeisestelle ist auf der Rückseite des dritten Flügels angeordnet.The pipe section with a feed point for one or more such feed points comprises a pipe wall and a static mixing element. The feed points are provided for introducing the additives into a flowing low-viscosity fluid. The static mixing element consists of a pair of wings and a third wing. The pair of wings, which forms a constriction which deflects the flow of the fluid, is designed essentially mirror-symmetrically with respect to a center plane extending in the direction of the flow. The third wing is arranged with respect to the wing pair in a crossing manner as well as in the region of the median plane. It has a rear side with respect to the flow, which extends from a base on the pipe wall to a downstream end. Each entry point is located on the back of the third wing.

Erfindungsgemäss ist die Einspeisestelle auf der Rückseite des dritten Flügels angeordnet. Es hat sich überraschenderweise herausgestellt, dass mit einer solchen Anordnung, die dank einer einzigen Einspeisestelle konstruktiv sehr einfach ist, sich eine Mischgüte ergibt, die wesentlich besser als erwartet ist. Diese Mischgüte ist besser als bei der konstruktiv aufwändigeren Ringdosiereinrichtung, in der das Additiv - in Erwartung einer besseren Mischgüte - durch einen ringförmigen Kanal und eine Mehrzahl von Düsenkanälen in den Mischraum eingespeist wird, wobei in diesem Mischraum ein gleiches Mischelement wie bei der günstigeren Anordnung eingebaut ist.According to the invention, the feed point is arranged on the rear side of the third wing. It has surprisingly been found that with such an arrangement, which is structurally very simple thanks to a single feed point, results in a quality of mixing, which is much better than expected. This quality of mixing is better than in the structurally more complex Ringdosiereinrichtung in which the additive - in anticipation of better mixing quality - by an annular channel and a plurality of Nozzle channels is fed into the mixing chamber, wherein in this mixing chamber, a same mixing element is installed as in the cheaper arrangement.

Die abhängigen Ansprüche 2 bis 7 betreffen vorteilhafte Ausführungsformen des erfindungsgemässen Rohrstücks. Die Ansprüche 8 und 9 beziehen sich auf eine Rohrleitung, in der das erfindungsgemässe Rohrstück eingebaut ist. Eine Verwendung ist Gegenstand des Anspruchs 10.The dependent claims 2 to 7 relate to advantageous embodiments of the inventive pipe section. The claims 8 and 9 relate to a pipeline in which the pipe piece according to the invention is installed. A use is subject of claim 10.

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

Fig. 1
ein erfindungsgemässes Rohrstück,
Fig. 2
einen Querschnitt durch das Rohrstück der Fig. 1,
Fig. 3
eine zweite Ausführungsform des Rohrstücks,
Fig. 4
ein Rohrstück mit einem speziell ausgeführten Mischelement,
Fig. 5
eine schematische Darstellung zur Erläuterung von Messungen,
Fig. 6
ein Diagramm mit Messergebnissen,
Fig. 7
eine Darstellung der Strömungsverhältnisse im statischen Mischer des erfindungsgemässen Rohrstücks und
Fig. 8
eine Einrichtung, in der drei erfindungsgemässe Rohrstücke parallel angeordnet sind.
The invention will be explained with reference to the drawings. Show it:
Fig. 1
a pipe piece according to the invention,
Fig. 2
a cross section through the pipe section of Fig. 1,
Fig. 3
a second embodiment of the pipe section,
Fig. 4
a piece of pipe with a specially designed mixing element,
Fig. 5
a schematic representation for explaining measurements,
Fig. 6
a diagram with measurement results,
Fig. 7
a representation of the flow conditions in the static mixer of the inventive pipe section and
Fig. 8
a device in which three pipe pieces according to the invention are arranged in parallel.

Die Figuren 1 und 2 stellen ein erfindungsgemässes Rohrstück 1 mit einer Einspeisestelle 2 für ein Additiv 20 dar. Eine zylindrische Rohrwand 11 weist eine Eingangseite 13 für einen Anschluss an eine stromaufwärts liegende Rohrleitung 3 auf und eine Ausgangseite 14 für einen Anschluss an eine stromabwärts liegende Rohrleitung 4. Durch den Innenraum des Rohrstücks 1 führt die Strömung 10' eines niedrigviskosen Fluids 10. Mit einem statischen Mischelement 12, das stromabwärts nach der Eingangseite 13 angeordnet ist, wird das Additiv 20 in das Fluid 10 eingemischt. Das Mischelement 12 besteht aus einem Flügelpaar 5 mit Flügeln 5a, 5b und einem dritten Flügel 6. Das Flügelpaar 5, das eine die Strömung 10' des Fluids 10 umlenkende Blende bildet, ist bezüglich einer in Richtung der Strömung 10' sich erstreckenden Mittelebene 15 im wesentlichen spiegelsymmetrisch ausgebildet. Der dritte Flügel 6 befindet sich im Bereich der Mittelebene 15, durch die er entlang der strichpunktierten Linie 156 geschnitten wird. Der dritte Flügel 6 ist bezüglich dem Flügelpaar 5 in einer kreuzenden Weise angeordnet. Er weist in Bezug auf die Strömung 10' eine Rückseite 60 auf, die sich von einer Basis an der Rohrwand 11 zu einem stromabwärts liegenden Ende erstreckt und dabei einen in der Mittelebene 15 liegenden Winkel 61 von 30° bis 60° bildet. Erfindungsgemäss ist die Einspeisestelle 2 auf der Rückseite des dritten Flügels 6 angeordnet. Der Winkel 61 hat vorzugsweise einen Wert von 40° bis 50°.Figures 1 and 2 illustrate a pipe piece 1 according to the invention with a feed point 2 for an additive 20. A cylindrical pipe wall 11 has an inlet side 13 for connection to an upstream pipe 3 and an outlet side 14 for connection to a downstream pipe 4. Through the interior of the pipe section 1, the flow 10 'of a low-viscosity fluid 10 leads with a static mixing element 12, which is arranged downstream of the input side 13, the additive 20 is mixed into the fluid 10. The mixing element 12 is made from a pair of wings 5 with wings 5a, 5b and a third wing 6. The pair of wings 5, which forms a 10 'flow deflecting the flow 10', is formed with respect to a in the direction of the flow 10 'extending median plane 15 is substantially mirror-symmetrical. The third wing 6 is located in the region of the median plane 15, through which it is cut along the dot-dash line 156. The third wing 6 is arranged with respect to the pair of wings 5 in a crossing manner. It has, with respect to the flow 10 ', a back side 60 which extends from a base on the tube wall 11 to a downstream end and thereby forms an angle 61 of 30 ° to 60 ° lying in the median plane 15. According to the invention, the feed point 2 is arranged on the rear side of the third wing 6. The angle 61 preferably has a value of 40 ° to 50 °.

Die Einspeisestelle 2 umfasst einen Stutzen 2' und einen durch die Rohrwand 11 führenden Düsenkanal 21, der insbesondere eine Bohrung ist. Ein Innengewinde 22 ist in der Ausführungsform der Fig. 2 für einen Anschluss an eine Leitung vorgesehen, durch die das Additiv 20 zugeführt werden kann.
Die Rohrwand 11 mit der Eingangseite 13 und der Ausgangseite 14 ist als Zwischenflanschstück ausgebildet. Zwischen einem Flansch 31 der stromaufwärts liegenden Rohrleitung 3 und einem Flansch 41 einer stromabwärts liegenden Rohrleitung 4 ist das Zwischenflanschstück 11 einspannbar. Die beiden Flansche 31 und 41 lassen sich mittels in Bohrungen 32 eingelegten, nicht dargestellten Schrauben verbinden und zusammenspannen.The feed point 2 comprises a connecting piece 2 'and a nozzle channel 21 leading through the pipe wall 11, which is in particular a bore. An internal thread 22 is provided in the embodiment of FIG. 2 for connection to a conduit through which the additive 20 can be supplied.
The pipe wall 11 with the input side 13 and the output side 14 is formed as Zwischenflanschstück. Between a flange 31 of the upstream pipeline 3 and a flange 41 of a downstream pipeline 4, the Zwischenflanschstück 11 can be clamped. The two flanges 31 and 41 can be connected by means of inserted in holes 32, screws, not shown, and clamp together.

Die Flügel 5a, 5b des Paars 5 liegen auf zwei Ebenen, die sich zumindest angenähert in der Mittelebene 15 unter einem flachen Winkel (ϕ, siehe Fig. 7) schneiden. Vorzugsweise liegen die Flügel 5a, 5b an peripheren Kanten 51 a bzw. 51 b ohne Lücken an die Rohrwand 11 an; sie können mit der Rohrwand 11 verbunden sein.The wings 5a, 5b of the pair 5 lie on two planes, which intersect at least approximately in the median plane 15 at a shallow angle (φ, see FIG. 7). Preferably, the wings are 5a, 5b at peripheral edges 51 a and 51 b without gaps on the pipe wall 11 at; they can be connected to the pipe wall 11.

Die Rohrwand 11 ist mit einer Form dargestellt, bei welcher der Rohrquerschnitt kreisförmig ist. Dieser kann aber auch andere Formen aufweisen.The pipe wall 11 is shown with a shape in which the pipe cross-section is circular. This can also have other shapes.

Fig. 3 zeigt eine zweite Ausführungsform des Rohrstücks 1: die Eingangseite13 ist als eingangseitiger Flansch 13' ausgebildet; ausgangseitig ist ein zweiter Flansch 14' angeordnet, der an die stromabwärts liegende Rohrleitung 4 über einen Flansch 41 anschliessbar ist. Diese Ausführungsform eignet sich für grosse Additivmengen. Die Einspeisestelle 2 ist ein Rohr mit relativ grossem Durchmesser, welches ohne einen Engpass in den Innenraum der Rohrwand 11 mündet. Der dritte Flügel 6 kann mittels einer Verstärkungsrippe 63 versteift sein. Die drei Flügel 5a, 6, 5b (5b nicht sichtbar) können zu einer weiteren Verstärkung an den Flügelenden mit einem Querträger 64 verbunden sein. Durch diese Verstärkung wird ein Schwingen der Flügel verhindert. Es kann auch der eingangseitige Flansch 13' oder der ausgangseitige Flansch 14' fehlen.Fig. 3 shows a second embodiment of the pipe section 1: the input side 13 is formed as an input-side flange 13 '; On the output side, a second flange 14 'is arranged, which can be connected to the downstream pipeline 4 via a flange 41. This embodiment is suitable for large amounts of additive. The feed point 2 is a tube with a relatively large diameter, which opens without a bottleneck in the interior of the tube wall 11. The third wing 6 may be stiffened by means of a reinforcing rib 63. The three wings 5a, 6, 5b (5b not visible) may be connected to a further reinforcement at the wing tips with a cross member 64. This reinforcement prevents the wings from swinging. It is also the input-side flange 13 'or the output-side flange 14' missing.

Fig. 4 zeigt ein Rohrstück 1 mit einem besonders ausgeführten Mischelement 12. Die Flügel 5a, 6 und 5b sind an einem flachen Ring 7 befestigt oder mit einem solchen verbunden. Dieser Ring 7 ist zwischen dem Flansch 31 der Rohrleitung 3 und der Eingangseite 13 dicht eingelegt, vorzugsweise mit Dichtungen 70 (nur eine dargestellt). Der Ring 7 kann auch in eine Nut eingelegt sein (nicht dargestellt), wobei diese Nut eine flache Vertiefung auf der Stirnseite 31 a des Flansches 31 bildet.Fig. 4 shows a pipe section 1 with a specially designed mixing element 12. The wings 5a, 6 and 5b are attached to a flat ring 7 or connected to such. This ring 7 is tightly inserted between the flange 31 of the pipe 3 and the input side 13, preferably with seals 70 (only one shown). The ring 7 may also be inserted into a groove (not shown), said groove forms a shallow recess on the end face 31 a of the flange 31.

Eine Rohrleitung, in die das erfindungsgemässe Rohrstück 1 eingebaut ist, umfasst Teile 3 und 4, die stromaufwärts und stromabwärts vom eingebauten Rohrstück 1 liegen. Diese Teile 3 und 4 haben den gleichen oder weitgehend den gleichen inneren Durchmesser D wie das eingebaute Rohrstück 1.A pipeline, in which the pipe section 1 according to the invention is installed, comprises parts 3 and 4 which lie upstream and downstream of the installed pipe section 1. These parts 3 and 4 have the same or largely the same inner diameter D as the built-pipe section. 1

Anhand einer schematischen Darstellung, die in Fig. 5 abgebildet ist, werden einige Grössen im Hinblick auf die in Fig. 6 gezeigten Messresultate erläutert: Die Rohrwand 11 allein oder zusammen mit einem Teil der stromabwärts liegenden Rohrleitung 4 enthalten eine Rohrstrecke 114, deren Anfang 16 bei x = 0 (Austrittsseite des statischen Mischelements 12) liegt und deren Ende 17 bei x = L (Länge der Rohrstrecke 114) liegt. Für eine vorgegebene Homogenität einer Additivverteilung 8 muss der Quotient L/D (D = Rohrinnendurchmesser) einen Wert annehmen, der von der Mischwirkung der das Mischelement 12 und die Einspeisestelle 2 umfassenden Einrichtung abhängt. Die Additivverteilung 8 - siehe das Diagramm auf der rechten Seite in Fig. 5 - ist für jede Wegkoordinate x durch eine Konzentration c(y, z) darstellbar (wobei die Koordinaten x, y und z ein Orthogonalsystem bilden). Diese Konzentration variiert um einen Mittelwert cm im Bereich eines Intervalls der Breite Δc. Je grösser x ist, desto kleiner ist Δc aufgrund der Wirkung des statischen Mischers. Ein experimentell bestimmbarer Verteilungskoeffizient CoV ist ein Mass für das Verhältnis Δc/cm (wobei CoV = Standardabweichung dividiert durch cm: CoV2 = Σ(ci/cm - 1)2/(n-1) für n Messwerte ci, i = 1 ... n). Ist dieser Koeffizient CoV gleich 0.05, so kann die Additivverteilung für die meisten Anwendungen als genügend homogen bezeichnet werden.On the basis of a schematic representation, which is shown in Fig. 5, some sizes are explained with respect to the measurement results shown in Fig. 6: The pipe wall 11 alone or together with a portion of the downstream pipe 4 include a pipe section 114, the beginning of the 16th at x = 0 (outlet side of the static mixing element 12) and the end 17 is at x = L (length of the pipe section 114). For a given homogeneity of an additive distribution 8, the quotient L / D (D = inner tube diameter) must assume a value that depends on the mixing effect of the device comprising the mixing element 12 and the feed point 2. The additive distribution 8 - see the diagram on the right in FIG. 5 - can be represented by a concentration c (y, z) for each path coordinate x (where the coordinates x, y and z form an orthogonal system). This concentration varies around an average value c m in the range of an interval of width Δc. The larger x, the smaller Δc due to the effect of the static mixer. An experimentally determinable distribution coefficient CoV is a measure of the ratio Δc / c m (where CoV = standard deviation divided by c m : CoV 2 = Σ (c i / c m -1) 2 / (n-1) for n measured values c i , i = 1 ... n). If this CoV coefficient is 0.05, the additive distribution for most applications can be said to be sufficiently homogeneous.

Das Diagramm der Fig. 6 zeigt Messergebnisse für drei statische Mischer, wobei ein Mischverhältnis von 1 : 2000 (0.05 %) gewählt worden ist: Die beiden Punkte an den Enden der Strecke 9 (Quadrate) sind Messwerte für das erfindungsgemässe Rohrstück 1. Der Pfeil 91 zeigt auf die Stelle L/D, an der eine homogene Additivverteilung erreicht ist: L/D beträgt dort ungefähr 2.5. Entsprechende Messwerte (Kreise) auf dem Streckenzug 9' sind für eine Ringdosiereinrichtung mit sechzehn Einspeisestellen erhalten worden. Hier ist L/D ungefähr gleich 3.5 (Pfeil 91'), also deutlich grösser. Die Messwerte (Kreuze) der Strecke 9" sind für ein anderes Mischelement gefunden worden, das eine sehr einfache Form hat und das in der EP-A- 800 857 (= P.6730) beschrieben ist. Für dieses Mischelement hat man erwartet, dass die Mischwirkung ebenfalls relativ gut ist. Hier hat sich aber die erforderliche Mischstrecke 4 als wesentlich länger erwiesen (siehe Pfeil 91"). Weitere Messungen für das erfindungsgemässe Rohrstück 1 bei anderen Mischverhältnissen haben zu weitgehend gleichen Resultate geführt. Beispielsweise für das Mischverhältnis 1:5 (20%) hat sich eine um Weniges kürzere Mischstrecke L ergeben. Interessanterweise haben sich für die anderen, bekannten Mischeinrichtungen ausgeprägtere Abhängigkeiten von dem Mischverhältnis ergeben. Die entsprechende Mischstrecke ist aber für die erfindungsgemässe Einrichtung immer deutlich kürzer ausgefallen.The diagram of FIG. 6 shows measurement results for three static mixers, wherein a mixing ratio of 1: 2000 (0.05%) has been selected: The two points at the ends of the segment 9 (squares) are measured values for the pipe piece 1 according to the invention 91 points to point L / D, where a homogeneous additive distribution is achieved: L / D is approximately 2.5. Corresponding measured values (circles) on the line 9 'have been obtained for a ring feeder with sixteen feed points. Here L / D is about 3.5 (arrow 91 '), so much bigger. The measured values (crosses) of the segment 9 "have been found for another mixing element which has a very simple shape and which is described in EP-A-800 857 (= P.6730) the mixing effect is also relatively good, but here the required mixing section 4 has proved to be considerably longer (see arrow 91 "). Further measurements for the pipe section 1 according to the invention at other mixing ratios have led to largely identical results. For example, for the mixing ratio 1: 5 (20%), a shorter mixing distance L has resulted. Interestingly, more pronounced dependencies on the mixing ratio have resulted for the other known mixing devices. However, the corresponding mixing section has always been significantly shorter for the device according to the invention.

Es lässt sich somit festhalten, dass das erfindungsgemässe Rohrstück 1, das konstruktiv sehr einfach aufgebaut ist, eine unerwartet gute Mischwirkung aufweist und zwar unerwartet gut gegenüber anderen Mischern, für die auch gute Mischwirkungen erwartet worden sind.It can thus be stated that the tube piece 1 according to the invention, which has a very simple construction, has an unexpectedly good mixing action, and that is unexpectedly good over other mixers for which good mixing effects have also been expected.

Das erfindungsgemässe Rohrstück eignet sich dazu, ein fluides, niedrigviskoses Additiv 20 in einen Hauptstrom 10' einzumischen. Der Additivstrom ist in der Regel nicht grösser als der Hauptstrom. Es lassen sich auch praktisch beliebig kleine Mischverhältnisse (z.B. 1 : 10 000) herstellen. Angepasst muss jeweils der Durchmesser der Einspeisestelle werden.The tube piece according to the invention is suitable for mixing a fluid, low-viscosity additive 20 into a main flow 10 '. The additive stream is usually not larger than the main stream. It is also possible to produce practically any desired small mixing ratios (for example 1: 10,000). The diameter of the feed point must be adapted in each case.

In Fig. 7 sind die Strömungsverhältnisse im statischen Mischelement 12 des erfindungsgemässen Rohrstücks 1 (Wand 11) dargestellt, wie sie sich aus Strömungsberechnungen ergeben haben: Durch das Flügelpaar 5 wird das zuströmende Fluid 10 teilweise zum dritten Flügel 6 gelenkt. Das durch den Engpass des Flügelpaars 5 durchtretende Fluid 10 bildet auf den Leeseiten der Flügel 5a, 5b und 6 zwei gegenläufig rotierende Wirbel 10a und 10b aus. An der Basis des dritten Flügels entstehen zusätzlich kleine Wirbel 10c und 10d, die rasch abebben. Aufgrund dieser Strömungsverhältnisse, die durch das statische Mischelement induziert werden, ergibt sich die experimentell bestätigte, hervorragende Mischwirkung. Das Flügelpaar 5 bildet einen flachen Winkel ϕ, der kleiner als 180° ist und der sich vorteilhaft auf die Ausbildung der Wirbel 10a und 10b auswirkt.In Fig. 7, the flow conditions in the static mixing element 12 of the inventive pipe section 1 (wall 11) are shown, as they have resulted from flow calculations: By the pair of wings 5, the inflowing fluid 10 is partially directed to the third wing 6. The passing through the bottleneck of the wing pair 5 fluid 10 forms on the leeward sides of the wings 5a, 5b and 6 two counter-rotating vortexes 10a and 10b. In addition, at the base of the third wing, small vortices 10c and 10d are formed, which rapidly abate. Due to these flow conditions induced by the static mixing element, the experimentally confirmed excellent mixing effect results. The pair of wings 5 forms a shallow angle φ which is smaller than 180 ° and which has an advantageous effect on the formation of the vertebrae 10a and 10b.

Fig. 8 zeigt eine Einrichtung, in der drei erfindungsgemässe Rohrstücke 1, die rechteckige Querschnitte aufweisen, in einem gemeinsamen Kanal parallel angeordnet sind.Fig. 8 shows a device in which three inventive pipe sections 1, which have rectangular cross-sections, are arranged in parallel in a common channel.

Claims (10)

  1. A pipe member (1) having an infeed point (2) for an additive (20), having a pipe wall (11) and having a static mixing element (12), wherein provision is made for introducing the additive into a flowing, low viscosity fluid (10), wherein the static mixing element consists of a pair of vanes (5a, 5b) and of a third vane (6), wherein the vane pair (5) - forming a restriction deflecting the flow (10') of the fluid - is formed with substantially mirror symmetry with respect to a central plane (15) extending in the direction of the flow, wherein the third vane is arranged in a crossing manner with respect to the vane pair and in a lying manner in the region of the central plane and has a rear side (60) with respect to the flow which extends from a base at the pipe wall to a downstream end and thereby forms an angle (61) disposed in the central plane, characterised in that a single feed point is provided and in that the feed point is arranged at the rear side of the third vane.
  2. A pipe member in accordance with claim 1, characterised in that each feed point (2) includes a stub (2') and at least one nozzle passage (21), in particular a bore, leading through the pipe wall (11).
  3. A pipe member in accordance with claim 1 or claim 2, characterised in that the said angle (61) of the third vane (6) has a value between 30° and 60°, preferably a value between 40° and 50°.
  4. A pipe member in accordance with any one of claims 1 to 3, characterised in that an inlet side (13) is made for a connection to an upstream conduit (3) and/or an outlet side (4) is made for a connection to a downstream conduit (4).
  5. A pipe member in accordance with claim 3, characterised in that the vanes (5a, 5b, 6) of the static mixer element (12) are connected to a shallow ring (7); and in that this ring is inserted between a flange (31) of the conduit (3) and the inlet side (13).
  6. A pipe member in accordance with claim 4 or claim 5, characterised in that the inlet side (13) is made as a flange (13') at the inlet side and/or the outlet side (14) is made as a flange (14') at the outlet side.
  7. A pipe member in accordance with claim 4 or claim 5, characterised in that the pipe wall (11) is made as an intermediate flange member, in particular as a ring cylinder, which can be clamped between flanges (31, 41) of the upstream conduit (3) and the downstream conduit (4), with the two flanges preferably being able to be connected by means of screws.
  8. A pipe member in accordance with any one of claims 1 to 7, characterised in that the vanes (5a, 5b) of the pair (5) are arranged on two planes which intersect at least approximately at a shallow angle in the central plane (15); and in that these vanes preferably contact the pipe wall (11) at peripheral edges (51a, 51b) without gaps and are in particular connected to it.
  9. A conduit having a pipe member (1) in accordance with any one of claims 1 to 7, characterised in that a pipe length (114) is present downstream of an outlet side of the mixing element (12) whose length L is larger by a factor of 1 to 5, preferably 2 to 3, than the inner diameter D of the pipe member.
  10. Use of a pipe member (1) in accordance with any one of claims 1 to 8, characterised in that a fluid, low viscosity additive (20) is mixed into a main flow (10').
EP02405807A 2001-10-16 2002-09-17 Pipe segment with a feeding port for an additiv Expired - Lifetime EP1302236B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02405807A EP1302236B1 (en) 2001-10-16 2002-09-17 Pipe segment with a feeding port for an additiv

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP01811015 2001-10-16
EP01811015 2001-10-16
EP02405807A EP1302236B1 (en) 2001-10-16 2002-09-17 Pipe segment with a feeding port for an additiv

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EP1302236A1 EP1302236A1 (en) 2003-04-16
EP1302236B1 true EP1302236B1 (en) 2007-02-14

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Publication number Priority date Publication date Assignee Title
BR112013003705B1 (en) * 2010-09-28 2020-02-04 Dow Global Technologies Llc mixing duct, static mixer and method for mixing
GB201100673D0 (en) 2011-01-15 2011-03-02 Statiflo Internat Ltd Static mixer assembly
ITBO20110533A1 (en) * 2011-09-16 2013-03-17 Magneti Marelli Spa DISCHARGE SYSTEM OF AN INTERNAL COMBUSTION ENGINE PROVIDED WITH AN ADDITIVE INJECTION DEVICE
WO2015003873A1 (en) * 2013-07-11 2015-01-15 Evonik Industries Ag Method for producing silicic acid with variable thickening
US9963354B2 (en) 2013-07-11 2018-05-08 Evonik Degussa Gmbh Process for producing metal oxides

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Publication number Priority date Publication date Assignee Title
CH669336A5 (en) * 1985-12-11 1989-03-15 Sulzer Ag
US5839828A (en) * 1996-05-20 1998-11-24 Glanville; Robert W. Static mixer
CA2343561C (en) * 2000-05-08 2004-11-30 Sulzer Chemtech Ag Mixing element for a flange transition in a pipeline

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