EP1001841A1 - Cross-arm mixing nozzle - Google Patents

Cross-arm mixing nozzle

Info

Publication number
EP1001841A1
EP1001841A1 EP98943781A EP98943781A EP1001841A1 EP 1001841 A1 EP1001841 A1 EP 1001841A1 EP 98943781 A EP98943781 A EP 98943781A EP 98943781 A EP98943781 A EP 98943781A EP 1001841 A1 EP1001841 A1 EP 1001841A1
Authority
EP
European Patent Office
Prior art keywords
medium
cross
flow
line
behind
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.)
Withdrawn
Application number
EP98943781A
Other languages
German (de)
French (fr)
Inventor
Götz LAUSCHKE
Wilfried Schierholz
Stefan Ott
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Axiva GmbH and Co KG
Original Assignee
Axiva GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Axiva GmbH filed Critical Axiva GmbH
Publication of EP1001841A1 publication Critical patent/EP1001841A1/en
Withdrawn legal-status Critical Current

Links

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
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • B01F25/3131—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements

Definitions

  • the invention relates to a device for metering and mixing flowable media, comprising a line through which a first medium can flow, and at least two means for admixing a second medium into the first medium, which are arranged in the line and have a tubular design.
  • Devices of this type are known to the person skilled in the art from the prior art, for example as a nozzle with a swirl chamber, as a static mixer or as a mixing system with movable internals.
  • a nozzle with a swirl chamber for example as a static mixer or as a mixing system with movable internals.
  • some of the devices mentioned at the outset are used to make streamlines visible by coloring.
  • first-mentioned devices partly have the disadvantage of a high pressure loss, partly they tend to become soiled due to large surfaces, partly they involve high construction and assembly costs and partly they require an additional drive and additional seals.
  • the second group serves for dosing, but not for rapid mixing, as is required for applications in chemical process engineering, for example.
  • the invention was therefore based on the object of providing a device mentioned at the outset with improved properties with regard to quick and effective metering and mixing, which is also still easy to manufacture and maintain.
  • a device for metering and mixing flowable media comprising a line through which a first medium can flow, and at least two means for admixing a second medium into the first medium, which are arranged in the line and have a tubular design, characterized in that the at least two means each have one or more openings through which the second medium can be mixed into the first medium, and are arranged in a cross shape with respect to one another and one behind the other in the direction of flow.
  • the inner diameter of the line is referred to below as Dj, the outer diameter of the means as D a . Special configurations result from the subclaims.
  • a first embodiment is characterized in that the tubular means have at least 4 openings with the same or different diameters.
  • the outer diameters D a can also be the same or different.
  • the cross-shaped arrangement is advantageously chosen so that the free cross-sectional area of the line is a minimum.
  • An angular, preferably square, cross-sectional area is particularly favorable, as are the distances between the means from one another of at most 10 * D a , preferably at most 5 * D a ., Particularly preferably at most 2 * D a and very particularly preferably of at most 1 * D a . of the agent arranged at the front.
  • Favorable ratios of D a to Dj are in the range from 0.1 to 0.33.
  • the device according to the invention is also referred to below as a crossbar mixing nozzle (KMD).
  • the advantages of the KMD are due to its simple and compact design: low manufacturing and assembly costs, strong swirling of the flow directly at the point of addition of the second medium and therefore short mixing lengths with a small outer surface, no moving parts.
  • 1 shows a KMD in a broken, perspective side view
  • 2 shows a cross section through the KMD perpendicular to the flow direction
  • 3 shows a cross section through the KMD parallel to the direction of flow
  • Fig. 4 calculated flow conditions on a KMD.
  • a KMD 1 essentially consists of a line 2 for a first medium, usually a tube with an inner diameter 9 (Dj), into which several - in Fig. 2 four - tubular means 3 - hereinafter called crossbar 3 - for admixing a second Medium are installed.
  • the means have a square cross section and are arranged in the flow direction 4 one behind the other and in a cross shape.
  • the distance 5 between two crossbars 3 is less than whose outer diameter 6 (D a )., the diagonal of the cross section.
  • the crossbars are offset from one another so that the free cross-sectional area of the line 2 is minimal.
  • the order of the arrangement can be chosen arbitrarily.
  • the second medium is added via feed lines 7 and openings (bores or holes) 8.
  • the openings 8 are preferably located radially in the middle between the outer wall of the tube 2 and the outer edge of one of the other crossbars 3 (FIG. 2). They are preferably attached to the downstream side of the crossbar 3.
  • FIG. 4 shows calculated flow conditions on a KMD 1 with two square crossbeams 3.
  • the crossbars 3 disturb the flow in two axes and ensure an intensive swirling directly behind them.
  • the metering of the second medium takes place at the location of strong turbulence. This creates a quick and low-pressure mixing.
  • the dimensions are matched to the flow in such a way that the vortex road that arises behind the crossbeam oscillates unsteadily. Such preferred dimensions can be determined using such calculated flow conditions. The person skilled in the art is familiar with the numerical methods for this.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

A device for dosing and mixing fluid media has a pipe (2) with an inner diameter Di (9) through which a first medium can flow, and at least two tubular means (3) arranged in the pipe (2) and having an outer diameter Da (6) for mixing a second medium with the first medium. The device is characterised in that the at least two means (3) have each one or more openings (8) through which the second medium can be mixed with the first medium, the at least two means (3) having a polygonal cross-section and being arranged in a cross-shape one behind the other in the flow direction at a distance (5) of maximum 10*Da.

Description

Beschreibungdescription
KreuzbalkenmischdüseCrossbar mixing nozzle
Die Erfindung betrifft eine Vorrichtung zur Dosierung und zur Vermischung fließfähiger Medien, aufweisend eine Leitung, durchströmbar für ein erstes Medium, sowie mindestens zwei Mittel zum Zumischen eines zweiten Mediums in das erste Medium, die in der Leitung angeordnet und rohrförmig gestaltet sind.The invention relates to a device for metering and mixing flowable media, comprising a line through which a first medium can flow, and at least two means for admixing a second medium into the first medium, which are arranged in the line and have a tubular design.
Vorrichtungen dieser Art sind dem Fachmann aus dem Stand der Technik bekannt, beispielsweise als eine Düse mit Drallkammer, als statische Mischer oder als Mischsysteme mit bewegbaren Einbauten. In der Strömungsmeßtechnik werden manche der eingangs genannten Vorrichtungen benutzt, um Stromlinien durch Einfärbung sichtbar zu machen.Devices of this type are known to the person skilled in the art from the prior art, for example as a nozzle with a swirl chamber, as a static mixer or as a mixing system with movable internals. In flow measurement technology, some of the devices mentioned at the outset are used to make streamlines visible by coloring.
Diese erstgenannten Vorrichtungen haben teils den Nachteil eines hohen Druckverlustes, teils neigen sie infolge großer Oberflächen zur Verschmutzung, teils verursachen sie hohen Konstruktions- und Montageaufwand und teils erfordern sie einen zusätzlichen Antrieb und zusätzliche Dichtungen. Dagegen dient die zweitgenannte Gruppe zum Dosieren, nicht aber zum schnellen Mischen, wie es für Anwendungen in der chemischen Verfahrenstechnik beispielsweise erforderlich ist.These first-mentioned devices partly have the disadvantage of a high pressure loss, partly they tend to become soiled due to large surfaces, partly they involve high construction and assembly costs and partly they require an additional drive and additional seals. In contrast, the second group serves for dosing, but not for rapid mixing, as is required for applications in chemical process engineering, for example.
Der Erfindung lag daher die Aufgabe zugrunde, eine eingangs genannte Vorrichtung mit verbesserten Eigenschaften bezüglich des schnellen und effektiven Dosierens und Mischens bereitzustellen, die zudem noch einfach herzustellen und zu warten ist.The invention was therefore based on the object of providing a device mentioned at the outset with improved properties with regard to quick and effective metering and mixing, which is also still easy to manufacture and maintain.
Diese Aufgabe wird erfindungsgemäß gelöst durch eine Vorrichtung zur Dosierung und zur Vermischung fließfähiger Medien, aufweisend eine Leitung, durchströmbar für ein erstes Medium, sowie mindestens zwei Mittel zum Zumischen eines zweiten Mediums in das erste Medium, die in der Leitung angeordnet und rohrförmig gestaltet sind, dadurch gekennzeichnet, daß die mindestens zwei Mittel jeweils eine oder mehrere Öffnungen aufweisen, durch die das zweite Medium in das erste Medium einmischbar ist, und kreuzförmig zueinander und in Strömungsrichtung hintereinander angeordnet sind.This object is achieved according to the invention by a device for metering and mixing flowable media, comprising a line through which a first medium can flow, and at least two means for admixing a second medium into the first medium, which are arranged in the line and have a tubular design, characterized in that the at least two means each have one or more openings through which the second medium can be mixed into the first medium, and are arranged in a cross shape with respect to one another and one behind the other in the direction of flow.
Der inneren Durchmesser der Leitung wird im folgenden mit Dj, der äußere Durchmesser der Mittel mit Da, bezeichnet. Besondere Ausgestaltungen ergeben sich aus den Unteransprüchen.The inner diameter of the line is referred to below as Dj, the outer diameter of the means as D a . Special configurations result from the subclaims.
Eine erste Ausgestaltung ist dadurch gekennzeichnet, daß die rohrförmigen Mittel mindestens 4 Öffnungen mit gleichem oder unterschiedlichen Durchmessern aufweisen. Die äußeren Durchmesser Da können ebenfalls gleich oder unterschiedlich sein Außerdem wird die kreuzförmige Anordnung vorteilhafterweise so gewählt, daß die freie Querschnittsfläche der Leitung ein Minimum ist. Eine eckige, vorzugsweise quadratische Querschnittsfläche ist besonders günstig, ebenso wie Abstände der Mittel zueinander von höchstens 10*Da, bevorzugt höchstens 5*Da., besonders bevorzugt höchstens 2*Da und ganz besonders bevorzugt von höchstens 1*Da. des jeweils vorne angeordneten Mittels. Günstige Verhältnisse von Da zu Dj liegen im Bereich von 0,1 bis 0,33. Die erfindungsgemäße Vorrichtung wird im folgenden auch Kreuzbalkenmischdüse (KMD) genannt.A first embodiment is characterized in that the tubular means have at least 4 openings with the same or different diameters. The outer diameters D a can also be the same or different. In addition, the cross-shaped arrangement is advantageously chosen so that the free cross-sectional area of the line is a minimum. An angular, preferably square, cross-sectional area is particularly favorable, as are the distances between the means from one another of at most 10 * D a , preferably at most 5 * D a ., Particularly preferably at most 2 * D a and very particularly preferably of at most 1 * D a . of the agent arranged at the front. Favorable ratios of D a to Dj are in the range from 0.1 to 0.33. The device according to the invention is also referred to below as a crossbar mixing nozzle (KMD).
Die Vorteile der KMD liegen in ihrer einfachen und kompakten Bauweise begründet: geringer Fertigungs- und Montageaufwand, starke Verwirbelung der Strömung direkt an dem Ort der Zugabe des zweiten Mediums und dadurch kurze Mischlängen bei kleiner äußerer Oberfläche, keine bewegten Teile.The advantages of the KMD are due to its simple and compact design: low manufacturing and assembly costs, strong swirling of the flow directly at the point of addition of the second medium and therefore short mixing lengths with a small outer surface, no moving parts.
Im folgenden wird die Erfindung anhand einer möglichen Ausgestaltung der KMD, dargestellt in den Fig. 1 und 3 sowie dem Ergebnis einer Strömungsberechnung in Fig. 4, näher erläutert.The invention is explained in more detail below on the basis of a possible configuration of the KMD, shown in FIGS. 1 and 3 and the result of a flow calculation in FIG. 4.
Eine Beschränkung der Erfindung in irgendeiner Weise ist dadurch nicht beabsichtigt.It is not intended to limit the invention in any way.
Es zeigt:It shows:
Fig.1 eine KMD in aufgebrochener, perspektivischer Seitenansicht; Fig.2 einen Querschnitt durch die KMD senkrecht zur Strömungsrichtung; Fig.3 einen Querschnitt durch die KMD parallel zur Strömungsrichtung; Fig. 4 berechnete Strömungsverhältnisse an einer KMD.1 shows a KMD in a broken, perspective side view; 2 shows a cross section through the KMD perpendicular to the flow direction; 3 shows a cross section through the KMD parallel to the direction of flow; Fig. 4 calculated flow conditions on a KMD.
Eine KMD 1 besteht im wesentlichen aus einer Leitung 2 für ein erstes Medium, üblicherweise ein Rohr mit einem inneren Durchmesser 9 (Dj), in das mehrere - in Fig. 2 vier - rohrförmige Mittel 3 - nachfolgend Kreuzbalken 3 genannt - zum Zumischen eines zweiten Mediums eingebaut sind. Die Mittel haben einen quadratischen Querschnitt und sind in Strömungsrichtung 4 hintereinander und kreuzförmig angeordnet. Der Abstand 5 zwischen zwei Kreuzbalken 3 ist kleiner als deren äußerer Durchmesser 6 (Da)., die Diagonale des Querschnitts. In Fig. 2 sind die Kreuzbalken so gegeneinander versetzt angeordnet, daß die freie Querschnittsfläche der Leitung 2 minimal ist. Die Reihenfolge der Anordnung kann dabei beliebig gewählt werden. Die Zumischung des zweiten Mediums erfolgt über Zuleitungen 7 und Öffnungen (Bohrungen oder Löcher) 8. Bevorzugt liegen die Öffunngen 8 radial in der Mitte zwischen der Außenwand des Rohres 2 und der Außenkante eines der anderen Kreuzbalken 3 (Fig 2.). Sie sind bevorzugt auf der stromabwärtigen Seite der Kreuzbalken 3 angebracht.A KMD 1 essentially consists of a line 2 for a first medium, usually a tube with an inner diameter 9 (Dj), into which several - in Fig. 2 four - tubular means 3 - hereinafter called crossbar 3 - for admixing a second Medium are installed. The means have a square cross section and are arranged in the flow direction 4 one behind the other and in a cross shape. The distance 5 between two crossbars 3 is less than whose outer diameter 6 (D a )., the diagonal of the cross section. In Fig. 2, the crossbars are offset from one another so that the free cross-sectional area of the line 2 is minimal. The order of the arrangement can be chosen arbitrarily. The second medium is added via feed lines 7 and openings (bores or holes) 8. The openings 8 are preferably located radially in the middle between the outer wall of the tube 2 and the outer edge of one of the other crossbars 3 (FIG. 2). They are preferably attached to the downstream side of the crossbar 3.
Fig. 4 zeigt berechnete Strömungsverhältnisse an einer KMD 1 mit zwei quadratischen Kreuzbaiken 3. Wie zu sehen ist, stören die Kreuzbalken 3 die Strömung in zwei Achsen und sorgen für eine intensive Verwirbelung direkt hinter ihnen. Die Dosierung des zweiten Mediums erfolgt so an dem Ort starker Verwirbelung. Dadurch entsteht eine schnelle und druckverlustarme Vermischung. In einer bevorzugten Betriebsweise sind die Maße so auf die Strömung abgestimmt, daß die hinter den Kreuzbalken entstehende Wirbelstraße instationär pendelt. Solche bevorzugten Abmessungen kann man über solche berechneten Strömungsverhältnisse ermitteln. Die numerischen Methoden hierzu sind dem Fachmann geläufig. FIG. 4 shows calculated flow conditions on a KMD 1 with two square crossbeams 3. As can be seen, the crossbars 3 disturb the flow in two axes and ensure an intensive swirling directly behind them. The metering of the second medium takes place at the location of strong turbulence. This creates a quick and low-pressure mixing. In a preferred mode of operation, the dimensions are matched to the flow in such a way that the vortex road that arises behind the crossbeam oscillates unsteadily. Such preferred dimensions can be determined using such calculated flow conditions. The person skilled in the art is familiar with the numerical methods for this.

Claims

Patentansprüche claims
1. Vorrichtung zur Dosierung und zur Vermischung fließfähiger Medien, aufweisend eine Leitung (2), durchströmbar für ein erstes Medium, sowie mindestens zwei Mittel (3) zum Zumischen eines zweiten Mediums in das erste Medium, die in der Leitung (2) angeordnet und rohrförmig gestaltet sind, dadurch gekennzeichnet, daß die mindestens zwei Mittel (3) jeweils eine oder mehrere Öffnungen (8) aufweisen, durch die das zweite Medium in das erste Medium einmischbar ist, und kreuzförmig zueinander und in Strömungsrichtung hintereinander angeordnet sind.1. Device for metering and mixing flowable media, comprising a line (2) through which a first medium can flow, and at least two means (3) for admixing a second medium into the first medium, which are arranged in the line (2) and are tubular, characterized in that the at least two means (3) each have one or more openings (8) through which the second medium can be mixed into the first medium, and are arranged in a cross shape to one another and one behind the other in the direction of flow.
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, daß die rohrförmigen Mittel (3) mindestens 4 Öffnungen (8) aufweisen.2. Device according to claim 1, characterized in that the tubular means (3) have at least 4 openings (8).
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die kreuzförmige Anordnung so gewählt ist, daß die freie Querschnittsfläche der Leitung ungefähr ein Minimum ist.3. Apparatus according to claim 1 or 2, characterized in that the cross-shaped arrangement is chosen so that the free cross-sectional area of the line is approximately a minimum.
4. Vorrichtung nach mindestens einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der Querschnitt der rohrförmigen Mittel (3) eckig, vorzugsweise quadratisch ist.4. The device according to at least one of the preceding claims, characterized in that the cross section of the tubular means (3) is angular, preferably square.
5. Vorrichtung nach mindestens einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Mittel einen äußeren Durchmesser Da (6) aufweisen und in einem Abstand (5) von höchstens 10*Da, bevorzugt höchstens 5*Da besonders bevorzugt höchstens 2*Da und ganz besonders bevorzugt höchstens 1*Da hintereinander angeordnet sind.5. The device according to at least one of the preceding claims, characterized in that the means have an outer diameter D a (6) and at a distance (5) of at most 10 * D a , preferably at most 5 * D a, particularly preferably at most 2 * D a and very particularly preferably at most 1 * D a are arranged one behind the other.
6. Vorrichtung nach mindestens einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Abmessungen der Vorrichtung so auf die Strömung abgestimmt, daß die hinter den Mitteln (3) zum Zumischen entstehende Wirbelstraße instationär pendelt.6. The device according to at least one of the preceding claims, characterized in that the dimensions of the device are matched to the flow so that the vortex road arising behind the means (3) for admixing oscillates unsteadily.
7. Vorrichtung nach mindestens einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Verhältnisse von äußerem Durchmesser Da (6) der7. The device according to at least one of the preceding claims, characterized in that the ratios of the outer diameter D a (6)
Mittel zu innerem Durchmesser Dj (9) der Leitung Werte aus dem Bereich von 0,1 und 0,33 haben. Average inner diameter Dj (9) of the line have values in the range of 0.1 and 0.33.
EP98943781A 1997-08-06 1998-07-24 Cross-arm mixing nozzle Withdrawn EP1001841A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19733973 1997-08-06
DE19733973A DE19733973C2 (en) 1997-08-06 1997-08-06 Device for dosing and mixing flowable media
PCT/EP1998/004656 WO1999007461A1 (en) 1997-08-06 1998-07-24 Cross-arm mixing nozzle

Publications (1)

Publication Number Publication Date
EP1001841A1 true EP1001841A1 (en) 2000-05-24

Family

ID=7838123

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98943781A Withdrawn EP1001841A1 (en) 1997-08-06 1998-07-24 Cross-arm mixing nozzle

Country Status (4)

Country Link
EP (1) EP1001841A1 (en)
BR (1) BR9811841A (en)
DE (1) DE19733973C2 (en)
WO (1) WO1999007461A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1319435A3 (en) * 2001-12-12 2004-10-06 Collectplan GmbH Method and apparatus for introducing a first medium in a second medium

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2406470A1 (en) * 1977-10-18 1979-05-18 Utilisation Ration Gaz MIXING DEVICE FOR TWO FLUIDS AND WING VALVE EQUIPPED WITH SUCH A DEVICE
JPS54127064A (en) * 1978-03-06 1979-10-02 Komax Systems Inc Charging instrument of stationary mixer
DE4421352C2 (en) * 1994-06-17 1997-03-20 Specker Helmut Method and device for diluting a liquid concentrate with water

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9907461A1 *

Also Published As

Publication number Publication date
DE19733973A1 (en) 1999-04-29
DE19733973C2 (en) 2000-08-24
BR9811841A (en) 2000-08-15
WO1999007461A1 (en) 1999-02-18

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