EP1302236A1 - Pipe segment with a feeding port for an additiv - Google Patents
Pipe segment with a feeding port for an additiv Download PDFInfo
- 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
- Authority
- 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
Links
- 238000002156 mixing Methods 0.000 claims abstract description 45
- 239000000654 additive Substances 0.000 claims abstract description 26
- 230000000996 additive effect Effects 0.000 claims abstract description 20
- 239000012530 fluid Substances 0.000 claims abstract description 16
- 230000003068 static effect Effects 0.000 claims description 16
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000002347 injection Methods 0.000 abstract 3
- 239000007924 injection Substances 0.000 abstract 3
- 230000000694 effects Effects 0.000 description 7
- 238000005259 measurement Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 235000014366 other mixer Nutrition 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Images
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.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
Abstract
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
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.
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.
- 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
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
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
Die Rohrwand 11 ist mit einer Form dargestellt, bei welcher der
Rohrquerschnitt kreisförmig ist. Dieser kann aber auch andere Formen
aufweisen. The
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
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
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
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
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
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
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,
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
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
Claims (10)
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 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1302236A1 true EP1302236A1 (en) | 2003-04-16 |
EP1302236B1 EP1302236B1 (en) | 2007-02-14 |
Family
ID=26077428
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02405807A Expired - Lifetime EP1302236B1 (en) | 2001-10-16 | 2002-09-17 | Pipe segment with a feeding port for an additiv |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP1302236B1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
-
2002
- 2002-09-17 EP EP02405807A patent/EP1302236B1/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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)
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 |
Also Published As
Publication number | Publication date |
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EP1302236B1 (en) | 2007-02-14 |
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