EP1302236A1 - 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
EP1302236A1
EP1302236A1 EP02405807A EP02405807A EP1302236A1 EP 1302236 A1 EP1302236 A1 EP 1302236A1 EP 02405807 A EP02405807 A EP 02405807A EP 02405807 A EP02405807 A EP 02405807A EP 1302236 A1 EP1302236 A1 EP 1302236A1
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EP
European Patent Office
Prior art keywords
pipe
wing
wings
pair
part according
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
EP02405807A
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German (de)
French (fr)
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EP1302236B1 (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-in points and with a static one Mixing element.
  • the invention also relates to a pipeline with the according to the invention pipe piece and uses of the pipe section.
  • the Additives are introduced into a flowing low-viscosity fluid by means of mixed static static element.
  • the static mixing element consists from a pair of wings and a third wing, the crosswise is arranged with respect to the pair of wings.
  • Under wing is one plate-like body understood that is flat or slightly bent can, which has an elongated shape and which is located between a base and a narrow end.
  • the pipe piece according to the invention may in particular be a ring which between flanges from upstream and downstream Piping parts is clamped.
  • a flange ring for Dosing and mixing one additive (or several additives) into one Fluid flow is known, for example, from US Pat. No. 5,839,828.
  • the additive is fed via spigot into the interior of the ring, where it under the Influence of a vortex-inducing aperture mixed into the fluid stream becomes.
  • a Blending element with intersecting wings which at the aperture present symmetry does not have to use.
  • the should improved device in the form of a Ringdosier leverage be formed in which the admixture of the additive using a variety of Point of entry is performed, these feed points are positioned on an annular channel around the mixing element.
  • the object of the invention is a piece of pipe for mixing one or to provide a plurality of additives in a flowing low-viscosity fluid, wherein the pipe section contains a mixing element with intersecting wings and the Additive feed is done in a way that is simpler than that mentioned Ringdosier worn and without a loss in the mixing quality is feasible.
  • This object is defined by the in claim 1 Pipe piece solved.
  • the pipe section with a feed point for one or more additives Feeders includes a tube wall and a static mixing element.
  • the feed points are for introducing the additives in a flowing low viscosity fluid provided.
  • the static mixing element consists of a pair of wings and a third wing.
  • the pair of wings, the one the flow of fluid deflecting bottleneck is relative to one in Direction of the flow extending center plane substantially formed mirror-symmetrically.
  • the third wing is relative to the Pair of wings in a crossing manner as well as in the area of the middle plane arranged horizontally. He has with respect to the flow on a back, the extending from a base on the pipe wall to a downstream one End extends. Each entry point is at the back of the third wing arranged.
  • the feed point is on the back of the third Arranged wing.
  • Figures 1 and 2 represent a pipe piece 1 according to the invention with a Feed point 2 for an additive 20 is a cylindrical pipe wall 11 has an input side 13 for connection to an upstream one Pipe 3 on and an output side 14 for connection to a downstream pipe 4.
  • 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.
  • Das Pair of wings 5, which is a flow 10 'of the fluid 10 deflecting diaphragm is, with respect to a direction of the flow 10 'extending Center plane 15 formed substantially mirror-symmetrical.
  • the third Wing 6 is located in the area of the median plane 15, through which it passes along the dotted line 156 is cut.
  • the third wing 6 is with respect arranged the pair of wings 5 in a crossing manner. He points in relation on the flow 10 'on a back 60, extending from a base on the Tube wall 11 extends to a downstream end and thereby forms a lying in the median plane 15 angle 61 of 30 ° to 60 °.
  • the feed point 2 is on the back of the third Wing 6 arranged.
  • the angle 61 preferably has a value of 40 ° to 50 °.
  • the feed point 2 comprises a connecting piece 2 'and one through the pipe wall 11 leading nozzle channel 21, which is in particular a bore.
  • One Internal thread 22 is in the embodiment of Fig. 2 for a connection to provided a line through which the additive 20 can be supplied.
  • the pipe wall 11 with the input side 13 and the output side 14 is as Formed intermediate flange piece.
  • a downstream pipe 4 is the imprelansch Federation eleventh clamped.
  • the two flanges 31 and 41 can be by means of holes Connect 32 inserted screws, not shown, and pull together.
  • the wings 5a, 5b of the pair 5 lie on two levels, at least approximated in the median plane 15 at a shallow angle ( ⁇ , see Fig. 7) to cut.
  • the pipe wall 11 is shown with a shape in which the Tube cross-section is circular. But this can also be other forms exhibit.
  • Fig. 3 shows a second embodiment of the pipe section 1: the wishessseite13 is formed as an input-side flange 13 '; output side a second flange 14 'is arranged, which is connected to the downstream Pipe 4 can be connected via a flange 41.
  • the feeding point 2 is a pipe with a relatively large diameter, which without a bottleneck in the interior of the pipe wall 11 opens.
  • the third wing 6 can by means of a reinforcing rib 63 to be stiffened.
  • the three wings 5a, 6, 5b (5b not visible) can contribute to a further reinforcement at the wing tips be connected to a cross member 64. Through this reinforcement is a Swinging of the wings prevented. It can also be the input side flange 13 'or the output side flange 14' is 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 with connected to such.
  • This ring 7 is between the flange 31 of Pipe 3 and the input side 13 inserted tightly, preferably with Seals 70 (only one shown).
  • the ring 7 can also be in a groove be inserted (not shown), said groove on a shallow depression the end face 31 a of the flange 31 forms.
  • a pipeline into which the pipe section 1 according to the invention is installed includes parts 3 and 4, which are upstream and downstream of the built-in Pipe piece 1 lie. These parts 3 and 4 have the same or largely the same inner diameter D as the built-pipe section. 1
  • the additive distribution 8 - see the diagram on the right in FIG.
  • FIG. 6 shows measurement results for three static mixers, wherein a mixing ratio of 1: 2000 (0.05%) has been chosen:
  • the two points at the ends of stretch 9 (squares) are readings for the tube piece 1 according to the invention.
  • the arrow 91 points to the position L / D, where a homogeneous additive distribution is achieved: L / D is approximately there 2.5.
  • Corresponding measured values (circles) on the path 9 'are for a Ring dosing with sixteen feed points have been obtained.
  • L / D approximately equal to 3.5 (arrow 91 '), so much bigger.
  • the pipe section according to the invention is suitable for producing a fluid, low viscosity additive 20 in a main stream 10 'mix.
  • Additive flow is usually not greater than the main flow. It can be also practically arbitrarily small mixing ratios (for example 1: 10 000) produce.
  • the diameter of the feed point must be adapted in each case.
  • Fig. 7 the flow conditions in the static mixing element 12 of inventive pipe section 1 (wall 11) shown, as they are made Flow calculations have shown: Through the pair of wings 5 is the inflowing fluid 10 partially directed to the third wing 6. That by the Bottleneck of the wing pair 5 passing fluid 10 forms on the lee side the wings 5a, 5b and 6, two counter-rotating vortices 10a and 10b. At the base of the third wing additionally small vortices 10c and 10d, which abate quickly. Due to these flow conditions caused by the static mixing element are induced results in the experimental confirmed, excellent mixing effect.
  • the pair of wings 5 forms a shallow angle ⁇ which is smaller than 180 ° and which is advantageous to the Training the vertebrae 10a and 10b effects.
  • Fig. 8 shows a device in which three inventive pipe sections 1, the have rectangular cross sections, parallel in a common channel are arranged.

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

Abstract

Tubular piece (1) comprises injection sites (2) for an additive (20); a tubular wall (11); and a stationary mixing element (12). The injection sites introduce the additive into a flowing low viscosity fluid. The mixing element comprises a pair of blades (5a, 5b) and a third blade (6). The blade pair is formed in the central plane (15) extending in the flow direction. The third blade has a rear side extending from a base on the tubular wall to an end lying downstream. <??>Preferred Features: Each injection site comprises a support and a nozzle channel, especially a bore, leading through the tubular wall. The angle of the third blade is 30-60 degrees , preferably 40-50 degrees . The blade pair is connected to a flat ring (7) between a flange (31) of a pipe (3) and the inlet side (13).

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-in points and with a static one Mixing element. The invention also relates to a pipeline with the according to the invention pipe piece and uses of the pipe section. The Additives are introduced into a flowing low-viscosity fluid by means of mixed static static element. The static mixing element consists from a pair of wings and a third wing, the crosswise is arranged with respect to the pair of wings. Under wing is one plate-like body understood that is flat or slightly bent can, which has an elongated shape and which is located 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 (europäische, nicht vorveröffentlichte Anmeldung Nr. 01810359.8 = P.7032), 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 may in particular be a ring which between flanges from upstream and downstream Piping parts is clamped. Such a flange ring for Dosing and mixing one additive (or several additives) into one Fluid flow is known, for example, from US Pat. No. 5,839,828. The additive is fed via spigot into the interior of the ring, where it under the Influence of a vortex-inducing aperture mixed into the fluid stream becomes. To improve the quality of mixing has been proposed (European, unpublished application No. 01810359.8 = P.7032), instead of the aforementioned aperture, which has a special symmetry, a Blending element with intersecting wings, which at the aperture present symmetry does not have to use. In addition, the should improved device in the form of a Ringdosiereinrichtung be formed in which the admixture of the additive using a variety of Point of entry is performed, 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 a piece of pipe for mixing one or to provide a plurality of additives in a flowing low-viscosity fluid, wherein the pipe section contains a mixing element with intersecting wings and the Additive feed is done in a way that is simpler than that mentioned Ringdosiereinrichtung and without a loss in the mixing quality is feasible. This object is defined by the in claim 1 Pipe piece solved.

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 additives Feeders includes a tube wall and a static mixing element. The feed points are for introducing the additives in a flowing low viscosity fluid provided. The static mixing element consists of a pair of wings and a third wing. The pair of wings, the one the flow of fluid deflecting bottleneck is relative to one in Direction of the flow extending center plane substantially formed mirror-symmetrically. The third wing is relative to the Pair of wings in a crossing manner as well as in the area of the middle plane arranged horizontally. He has with respect to the flow on a back, the extending from a base on the pipe wall to a downstream one End extends. Each entry point is at the back of the third wing arranged.

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 on the back of the third Arranged wing. It has surprisingly been found that with such an arrangement, thanks to a single feed point structurally very simple, results in a mixed quality, the much better than expected. This mixing quality is better than the constructive more sophisticated Ringdosiereinrichtung in which the additive - in anticipation of a better mixing quality - by an annular channel and a plurality of Nozzle channels is fed into the mixing chamber, being in this Mixing a same mixing element as in the cheaper arrangement is installed.

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 pipe section according to the invention. 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 represent a pipe piece 1 according to the invention with a Feed point 2 for an additive 20 is a cylindrical pipe wall 11 has an input side 13 for connection to an upstream one Pipe 3 on and an output side 14 for connection to a downstream pipe 4. Through the interior of the pipe section. 1 leads the flow 10 'of a low viscosity fluid 10. 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. Das Pair of wings 5, which is a flow 10 'of the fluid 10 deflecting diaphragm is, with respect to a direction of the flow 10 'extending Center plane 15 formed substantially mirror-symmetrical. The third Wing 6 is located in the area of the median plane 15, through which it passes along the dotted line 156 is cut. The third wing 6 is with respect arranged the pair of wings 5 in a crossing manner. He points in relation on the flow 10 'on a back 60, extending from a base on the Tube wall 11 extends to a downstream end and thereby forms a lying in the median plane 15 angle 61 of 30 ° to 60 °. According to the invention, the feed point 2 is on the back of the third Wing 6 arranged. 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 one through the pipe wall 11 leading nozzle channel 21, which is in particular a bore. One Internal thread 22 is in the embodiment of Fig. 2 for a connection to provided a line through which the additive 20 can be supplied. The pipe wall 11 with the input side 13 and the output side 14 is as Formed intermediate flange piece. Between a flange 31 of the upstream pipe 3 and a flange 41 a downstream pipe 4 is the Zwischenflanschstück eleventh clamped. The two flanges 31 and 41 can be by means of holes Connect 32 inserted screws, not shown, and pull 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 levels, at least approximated in the median plane 15 at a shallow angle (φ, see Fig. 7) to cut. Preferably, the wings 5a, 5b on peripheral edges 51 a or 51 b without gaps on the pipe wall 11 at; they can work with the pipe wall 11 connected.

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 Tube cross-section is circular. But this can also be other forms exhibit.

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 Eingangsseite13 is formed as an input-side flange 13 '; output side a second flange 14 'is arranged, which is connected to the downstream Pipe 4 can be connected via a flange 41. These Embodiment is suitable for large amounts of additive. The feeding point 2 is a pipe with a relatively large diameter, which without a bottleneck in the interior of the pipe wall 11 opens. The third wing 6 can by means of a reinforcing rib 63 to be stiffened. The three wings 5a, 6, 5b (5b not visible) can contribute to a further reinforcement at the wing tips be connected to a cross member 64. Through this reinforcement is a Swinging of the wings prevented. It can also be the input side flange 13 'or the output side flange 14' is 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 with connected to such. This ring 7 is between the flange 31 of Pipe 3 and the input side 13 inserted tightly, preferably with Seals 70 (only one shown). The ring 7 can also be in a groove be inserted (not shown), said groove on a shallow depression the end face 31 a of the flange 31 forms.

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 into which the pipe section 1 according to the invention is installed, includes parts 3 and 4, which are upstream and downstream of the built-in Pipe piece 1 lie. 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 at x = L (length of the pipe section 114) is located. 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 chosen: The two points at the ends of stretch 9 (squares) are readings for the tube piece 1 according to the invention. The arrow 91 points to the position L / D, where a homogeneous additive distribution is achieved: L / D is approximately there 2.5. Corresponding measured values (circles) on the path 9 'are for a Ring dosing with sixteen feed points have been obtained. Here is L / D approximately equal to 3.5 (arrow 91 '), so much bigger. The measured values (Crosses) of the range 9 "have been found for another mixing element which has a very simple shape and that in EP-A-800 857 (= P.6730) is described. For this mixing element, it was expected that the Mixing effect is also relatively good. Here, however, has the required Mixing section 4 proved to be much longer (see arrow 91 ") Measurements for the pipe section 1 according to the invention in others Mixing ratios have led to largely identical results. For example, for the mixing ratio 1: 5 (20%) has a little shorter mixing distance L result. Interestingly, for the other dependencies of other known mixing devices give the mixing ratio. The corresponding mixing section is for the inventive device always turned out to be significantly shorter.

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 pipe piece 1 according to the invention, the structurally very simple, an unexpectedly good mixing effect has and unexpectedly good compared to other mixers, for the well good mixing effects have 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 pipe section according to the invention is suitable for producing a fluid, low viscosity additive 20 in a main stream 10 'mix. Of the Additive flow is usually not greater than the main flow. It can be also practically arbitrarily small mixing ratios (for example 1: 10 000) produce. 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 inventive pipe section 1 (wall 11) shown, as they are made Flow calculations have shown: Through the pair of wings 5 is the inflowing fluid 10 partially directed to the third wing 6. That by the Bottleneck of the wing pair 5 passing fluid 10 forms on the lee side the wings 5a, 5b and 6, two counter-rotating vortices 10a and 10b. At the base of the third wing additionally small vortices 10c and 10d, which abate quickly. Due to these flow conditions caused by the static mixing element are induced results in the experimental confirmed, excellent mixing effect. The pair of wings 5 forms a shallow angle φ which is smaller than 180 ° and which is advantageous to the Training the vertebrae 10a and 10b effects.

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, the have rectangular cross sections, parallel in a common channel are arranged.

Claims (10)

Rohrstück (1) mit einer Einspeisestelle (2) für ein Additiv (20) oder mehreren solchen Einspeisestellen, mit einer Rohrwand (11) und mit einem statischen Mischelement (12), wobei die Einspeisestellen zum Einbringen der Additive in ein strömendes niedrigviskoses Fluid (10) vorgesehen sind, das statische Mischelement aus einem Paar von Flügeln (5a, 5b) und einem dritten Flügel (6) besteht, das Flügelpaar (5) - einen die Strömung (10') des Fluids umlenkenden Engpass bildend - bezüglich einer in Richtung der Strömung sich erstreckenden Mittelebene (15) im wesentlichen spiegelsymmetrisch ausgebildet ist, der dritte Flügel bezüglich dem Flügelpaar in einer kreuzenden Weise sowie im Bereich der Mittelebene liegend angeordnet ist und bezüglich der Strömung eine Rückseite (60) aufweist, die sich von einer Basis an der Rohrwand zu einem stromabwärts liegenden Ende erstreckt und dabei einen in der Mittelebene liegenden Winkel (61) bildet, und jede Einspeisestelle auf der Rückseite des dritten Flügels angeordnet ist.Pipe section (1) with a feed point (2) for an additive (20) or a plurality of such feed points, with a pipe wall (11) and with a static mixing element (12), wherein the feed points for Introducing the additives into a flowing low-viscosity fluid (10) are provided, the static mixing element of a pair of Wings (5a, 5b) and a third wing (6), the wing pair (5) - a narrowing the flow (10 ') of the fluid bottleneck forming - with respect to an extending in the direction of the flow Center plane (15) is formed substantially mirror-symmetrical, the third wing relative to the wing pair in a crossing manner and is arranged lying in the region of the median plane and with respect the flow has a back (60) extending from a base the pipe wall extends to a downstream end and forming an angle (61) lying in the median plane, and each Feed point is arranged on the back of the third wing. Rohrstück nach Anspruch 1, dadurch gekennzeichnet, dass jede Einspeisestelle (2) einen Stutzen (2') und mindestens einen durch die Rohrwand (11) führenden Düsenkanal (21), insbesondere eine Bohrung, umfasst.Pipe part according to claim 1, characterized in that each feed point (2) comprises a connecting piece (2 ') and at least one through the pipe wall (11) leading nozzle channel (21), in particular a bore. Rohrstück nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der genannte Winkel (61) des dritten Flügels (6) einen Wert zwischen 30° und 60°, vorzugsweise einen Wert zwischen 40° und 50° hat.Pipe part according to claim 1 or 2, characterized in that said angle (61) of the third vane (6) has a value between 30 ° and 60 °, preferably a value between 40 ° and 50 °. Rohrstück nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass eine Eingangseite (13) für einen Anschluss an eine stromaufwärts liegende Rohrleitung (3) ausgebildet ist und/oder eine Ausgangseite (14) für einen Anschluss an eine stromabwärts liegende Rohrleitung (4) ausgebildet ist. Pipe part according to one of claims 1 to 3, characterized in that an input side (13) for connection to an upstream pipe (3) is formed and / or an output side (14) for connection to a downstream pipe (4) is trained. Rohrstück nach Anspruch 3, dadurch gekennzeichnet, dass die Flügel (5a, 5b, 6) des statischen Mischerelements (12) mit einem flachen Ring (7) verbunden sind und dass dieser Ring zwischen einem Flansch (31) der Rohrleitung (3) und der Eingangseite (13) eingelegt ist.Pipe part according to claim 3, characterized in that the wings (5a, 5b, 6) of the static mixer element (12) are connected to a flat ring (7) and that this ring between a flange (31) of the pipe (3) and the Input side (13) is inserted. Rohrstück nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass die Eingangseite (13) als eingangseitiger Flansch (13') ausgebildet ist und/oder die Ausgangseite (14) als ausgangseitiger Flansch (14') ausgebildet ist.Pipe part according to claim 4 or 5, characterized in that the input side (13) as an input-side flange (13 ') is formed and / or the output side (14) as an output-side flange (14') is formed. Rohrstück nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass die Rohrwand (11) als Zwischenflanschstück, insbesondere als ein Ringzylinder, ausgebildet ist, das zwischen Flansche (31, 41) der stromaufwärts liegenden Rohrleitung (3) sowie der stromabwärts liegenden Rohrleitung (4) einspannbar ist, wobei die beiden Flansche vorzugsweise mittels Schrauben verbindbar sind.Pipe part according to claim 4 or 5, characterized in that the pipe wall (11) as Zwischenflanschstück, in particular as a ring cylinder, formed between flanges (31, 41) of the upstream pipe (3) and the downstream pipe (4) can be clamped, wherein the two flanges are preferably connectable by means of screws. Rohrstück nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Flügel (5a, 5b) des Paars (5) auf zwei Ebenen angeordnet sind, die sich zumindest angenähert unter einem flachen Winkel in der Mittelebene (15) schneiden, und dass vorzugsweise diese Flügel an peripheren Kanten (51a, 51b) ohne Lücken an die Rohrwand (11) anliegen, insbesondere mit ihr verbunden sind.Pipe part according to one of claims 1 to 7, characterized in that the wings (5a, 5b) of the pair (5) are arranged on two planes which intersect at least approximately at a shallow angle in the median plane (15), and preferably these wings on peripheral edges (51 a, 51 b) rest without gaps on the pipe wall (11), in particular connected to it. Rohrleitung mit einem Rohrstück (1) gemäss einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass stromabwärts nach einer Ausgangsseite des Mischelements (12) eine Rohrstrecke (114) besteht, deren Länge L um einen Faktor 1 bis 5, vorzugsweise 2 bis 3, grösser als der innere Durchmesser D des Rohrstücks ist.Pipe having a pipe section (1) according to one of claims 1 to 7, characterized in that downstream of an outlet side of the mixing element (12) a pipe section (114) whose length L by a factor of 1 to 5, preferably 2 to 3, greater than the inner diameter D of the pipe section is. Verwendung eines Rohrstücks (1) gemäss einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass ein fluides, niedrigviskoses Additiv (20) in einen Hauptstrom (10') eingemischt wird.Use of a pipe section (1) according to any one of claims 1 to 8, characterized in that a fluid, low-viscosity additive (20) in a main stream (10 ') is mixed.
EP02405807A 2001-10-16 2002-09-17 Pipe segment with a feeding port for an additiv Expired - Lifetime EP1302236B1 (en)

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ITBO20110533A1 (en) * 2011-09-16 2013-03-17 Magneti Marelli Spa DISCHARGE SYSTEM OF AN INTERNAL COMBUSTION ENGINE PROVIDED WITH AN ADDITIVE INJECTION DEVICE
US20130176814A1 (en) * 2010-09-28 2013-07-11 Dow Global Technologies Llc Reactive flow static mixer with cross flow obstructions
WO2015003871A1 (en) * 2013-07-11 2015-01-15 Evonik Industries Ag Process for producing metal oxides
WO2015003873A1 (en) * 2013-07-11 2015-01-15 Evonik Industries Ag Method for producing silicic acid with variable thickening
US9403133B2 (en) 2011-01-15 2016-08-02 Statiflo International Limited Static mixer assembly

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US5839828A (en) * 1996-05-20 1998-11-24 Glanville; Robert W. Static mixer
EP1153650A1 (en) * 2000-05-08 2001-11-14 Sulzer Chemtech AG Mixing element for a flange junction in a pipe

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US4758098A (en) * 1985-12-11 1988-07-19 Sulzer Brothers Limited Static mixing device for fluids containing or consisting of solid particles
US5839828A (en) * 1996-05-20 1998-11-24 Glanville; Robert W. Static mixer
EP1153650A1 (en) * 2000-05-08 2001-11-14 Sulzer Chemtech AG Mixing element for a flange junction in a pipe

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130176814A1 (en) * 2010-09-28 2013-07-11 Dow Global Technologies Llc Reactive flow static mixer with cross flow obstructions
US20170197189A1 (en) * 2010-09-28 2017-07-13 Dow Global Technologies Llc Reactive flow static mixer with cross-flow obstructions
US9975094B2 (en) * 2010-09-28 2018-05-22 Dow Global Technologies Llc Reactive flow static mixer with cross-flow obstructions
US9403133B2 (en) 2011-01-15 2016-08-02 Statiflo International Limited 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
WO2015003871A1 (en) * 2013-07-11 2015-01-15 Evonik Industries Ag Process for producing metal oxides
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
US10280088B2 (en) 2013-07-11 2019-05-07 Evonik Degussa Gmbh Method for producing silicic acid with variable thickening
US11242259B2 (en) 2013-07-11 2022-02-08 Evonik Operations Gmbh Method for producing silicic acid with variable thickening

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