EP2150765B1 - Flow channel for a mixer-heat exchanger - Google Patents

Flow channel for a mixer-heat exchanger Download PDF

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Publication number
EP2150765B1
EP2150765B1 EP08748356A EP08748356A EP2150765B1 EP 2150765 B1 EP2150765 B1 EP 2150765B1 EP 08748356 A EP08748356 A EP 08748356A EP 08748356 A EP08748356 A EP 08748356A EP 2150765 B1 EP2150765 B1 EP 2150765B1
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EP
European Patent Office
Prior art keywords
flow channel
web plates
planes
longitudinal axis
inside diameter
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EP08748356A
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German (de)
French (fr)
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EP2150765A1 (en
Inventor
Martin SCHÖCHLIN
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Atlas Holding AG
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Atlas Holding AG
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/4316—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod
    • B01F25/43161—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod composed of consecutive sections of flat pieces of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90—Heating or cooling systems
    • B01F35/93—Heating or cooling systems arranged inside the receptacle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/24—Arrangements for promoting turbulent flow of heat-exchange media, e.g. by plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0052—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for mixers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0098—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for viscous or semi-liquid materials, e.g. for processing sludge

Definitions

  • the invention relates to a flow channel for a mixer-heat exchanger, which flow channel is tubular with a longitudinal axis and a circular in cross-section inner surface with an inner diameter and at least one mixing insert a length with a plurality of parallel to the longitudinal axis of the flow channel over the length of the mixing insert guided tubes having an inner diameter and arranged with a plurality of crossed, with the longitudinal axis of the flow channel at an angle including web plates of a width, wherein the web plates are arranged in two intersecting, a plurality of parallel planes with an intermediate spacing plane shares, and a third, a plurality of parallel planes having a width of the web plates corresponding spacing having plane group which intersects two intersecting plane shares at right angles, wherein the intersection lines of the planes of two intersecting planes of planes with the planes of the third layer family of longitudinal edges of the web plates arranged alternately between adjacent planes of the third group of planes in the planes of the two intersecting planes of planes, the tubes being passed through opening
  • a flow channel of the type mentioned is out EP 1 067 352 B1 known.
  • the invention has for its object to provide a flow channel of the type mentioned above, which leads in particular in highly viscous liquids to a significant improvement in heat exchange and allows the construction of a compact heat exchanger.
  • each mixing insert has at least twenty-eight crossed web plates, the ratio of the web width to the inner diameter of the flow channel is at most 0.25, the ratio of the length of the mixing insert to the inner diameter of the flow channel is at least 0.4 and the angle of the web plates to the longitudinal axis of the flow channel 30 ° to 60 ° and the ratio of the distance between adjacent planes of the intersecting, the web plates having plane shares to the inner diameter of the flow channel is at most 0.3 and the inner diameter of the tubes is less than 6.
  • the ratio of the distance between adjacent planes the intersecting, the web plates having level coulters to the inner diameter of the tubes less than 4, in particular less than 3.
  • Nusselt number is a dimensionless measure from the theory of similarity of heat transfer, which measures the improvement of heat transfer from a surface, if one compares the actual conditions with the conditions in which only heat conduction through a dormant layer would occur.
  • the crossed web plates can have a different angle to the longitudinal axis of the flow channel. However, an equal angle is preferred.
  • the planes of the two intersecting layers of planes can have different distances between them. However, an equal spacing is preferred.
  • the planes of the two intersecting planes of planes can have a slight curvature in the longitudinal axis of the flow channel.
  • the planes of the third layer of planes may have a different pitch, i.
  • the web plates can be different widths. However, an equal spacing of the planes and, accordingly, a same width of all web plates is preferred.
  • the mixing inserts in the flow channel are arranged one behind the other, wherein the adjacent mixing inserts are rotated by an angle of 90 ° about the longitudinal axis of the flow channel against each other.
  • the freely positionable tubes may be brazed or welded to the web plates, or the web plates may have shrunk to the tubes.
  • a second component via at least one tube with at least one hole for a liquid outlet, preferably via a plurality of tubes with a plurality Holes, a first, flowing in the flow channel component can be admixed.
  • mixing inserts can be arranged one behind the other with intervals of at most three times the length of a mixing insert, wherein the mixing inserts are rotated by the distances by an angle of 90 ° to each other.
  • the flow channel according to the invention is suitable as a static mixer.
  • a length L having mixing inserts 10, 12 for flowing in a flow channel media have according to Fig. 2 a tube bundle 14 with 188 arranged parallel to the longitudinal axis m, over the entire length L extending tubes 16.
  • Each mixing insert 10, 12 has a plurality of intersecting web plates 18 A, 18 B.
  • the web plates 18 A, 18 B all have an equal width b and lie in parallel to each other with the same spacing a arranged planes EA, EB, the two intersecting plane shares A, B form.
  • the planes EA of the plane group A include with the longitudinal axis m in each case an equal angle ⁇ A, ⁇ B of 45 °.
  • a third plane group C parallel to the longitudinal axis m and intersect the planes EA, EB of the two intersecting plane shares A, B at right angles.
  • the lines of intersection of the planes EA, EB of the two intersecting planes A, B form the planes EC of the third plane group C longitudinal edges 20 A, 20 B alternately between adjacent planes EC in the planes EA, EB of the two intersecting planes A, B arranged web plates 18 A, 18 B.
  • Fig. 3 are the by an angle of 90 ° about its longitudinal axis m against each other twisted mixing inserts 10, 12 arranged in a tubular flow channel 22 having an inner circumferential surface 24 with a circular cross-section, an inner diameter Di and a pipe or Strömungskanall Kunststoffsachse x.
  • the longitudinal axes m of the mixing inserts 10, 12 lie in the longitudinal axis x of the flow channel 22.
  • All web plates 18 A, 18 B extend within each mixing insert 10, 12 via their respective maximum through the end faces of the mixing inserts 10, 12 and through the inner wall of the flow channel, maximum length, the contour of the web plates 18 A, 18 B the circular Cross-section of the flow channel 22 is adapted so that the web plates 18 A, 18 B adjoin the inner circumferential surface 24 of the flow channel 22 with a small clearance.
  • the tubes 16 pass through the web plates 18 A, 18 B via openings arranged in these, which have according to the angle between the web plate 18 A, 18 B and tube 16 an elliptical edge boundary.
  • the tubes 16 are secured in the region of the openings via a soldering or welding point on the web plates 18 A, 18 B.
  • the web plates 18 A, 18 B are connected to each other at their intersections via soldering or welding points.
  • the individual mixing inserts 10, 12 When assembling a mixer-heat exchanger, the individual mixing inserts 10, 12 by the crossed arrangement of the corresponding number of web plates 18 A, 18 B prefabricated.
  • the prefabricated mixing inserts 10, 12 are rotated by 90 ° against each other in their longitudinal axis m strung together. Subsequently, the tubes 16 are pushed parallel to the longitudinal axis m through the openings in the web plates 18 A, 18 B and secured thereto. The insert thus manufactured is subsequently inserted into the flow channel.
  • FIG. 5 the results of measurements of the heat transfer at three differently constructed flow channels S1, S2, S3 as Nusseltiere (Nu) as a function of the ratio web distance (a) / tube inner diameter (di) at a constant reference Pecleteahl (Pe ref ) are shown graphically.
  • the structure of the flow channels S1, S2, S3 can be seen from the table below. Table: Structure of the investigated flow channels flow channel S1 S2 S3 Inner diameter (Di) of the flow channel [mm] 145 279.3 358 Number of pipes 52 180 180 Inner diameter (di) of the tubes [mm] 10 10 10 10
  • the web distance (a) results from the measured values from the ratio web distance (a) / pipe internal diameter (di) in Fig. 5 , From the Fig. 5 is the surprising effect that the heat transfer suddenly rises unexpectedly when falling below a certain ratio, clearly visible.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Fluid Mechanics (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention relates to a flow channel having a mixing insert and a plurality of tubes guided parallel to the longitudinal axis of the flow channel over the length of the mixing insert, each mixing insert including at least twenty-eight pairwise crossed multi-wall sheets, the ratio of the width of the multi-wall sheets to the inside diameter of the flow channel being no more than 0.25, the ratio of the length of the mixing insert to the inside diameter of the flow channel being no less than 0.4, and the angle of the multi-wall sheets to the longitudinal axis of the flow channel being 30° to 60° and the ratio of the intermediate spacing of neighboring planes to the inside diameter of the flow channel being no more than 0.3, and to the inside diameter of the tubes being less than 6.

Description

Technisches GebietTechnical area

Die Erfindung betrifft einen Strömungskanal für einen Mischer-Wärmetauscher, welcher Strömungskanal rohrförmig mit einer Längsachse und mit einer im Querschnitt kreisrunden Innenmantelfläche mit einem inneren Durchmesser ausgebildet ist und mindestens einen Mischeinsatz einer Länge mit einer Vielzahl von parallel zur Längsachse des Strömungskanals über die Länge des Mischeinsatzes geführten Rohren mit einem inneren Durchmesser und mit einer Vielzahl von gekreuzt angeordneten, mit der Längsachse des Strömungskanals einen Winkel einschliessenden Stegplatten einer Breite aufweist, wobei die Stegplatten in zwei sich kreuzenden, eine Vielzahl von parallelen Ebenen mit einem Zwischenabstand aufweisenden Ebenenscharen angeordnet sind, und eine dritte, eine Vielzahl von parallelen Ebenen mit einen der Breite der Stegplatten entsprechenden Zwischenabstand aufweisende Ebenenschar die zwei sich kreuzenden Ebenenscharen rechtwinklig schneidet, wobei die Schnittlinien der Ebenen der zwei sich kreuzenden Ebenenscharen mit den Ebenen der dritten Ebenenschar Längskanten der zwischen benachbarten Ebenen der dritten Ebenenschar alternierend in den Ebenen der zwei sich kreuzenden Ebenenscharen angeordneten Stegplatten bilden, wobei die Rohre durch Öffnungen in den Stegplatten hindurchgeführt und an den Stegplatten befestigt sind.The invention relates to a flow channel for a mixer-heat exchanger, which flow channel is tubular with a longitudinal axis and a circular in cross-section inner surface with an inner diameter and at least one mixing insert a length with a plurality of parallel to the longitudinal axis of the flow channel over the length of the mixing insert guided tubes having an inner diameter and arranged with a plurality of crossed, with the longitudinal axis of the flow channel at an angle including web plates of a width, wherein the web plates are arranged in two intersecting, a plurality of parallel planes with an intermediate spacing plane shares, and a third, a plurality of parallel planes having a width of the web plates corresponding spacing having plane group which intersects two intersecting plane shares at right angles, wherein the intersection lines of the planes of two intersecting planes of planes with the planes of the third layer family of longitudinal edges of the web plates arranged alternately between adjacent planes of the third group of planes in the planes of the two intersecting planes of planes, the tubes being passed through openings in the web plates and fixed to the web plates.

Stand der TechnikState of the art

Aus DE 28 08 854 C3 ist ein nach üblichem Sprachgebrauch als "statischer Mischer" bezeichneter Strömungskanal für einen Wärmeaustausch mit Einbauten aus parallelen Gruppen von einander durchkreuzenden, an ihren Kreuzungsstellen miteinander verbundenen Stegen bekannt. Diese Vorrichtung mischt hauptsächlich den Stoffstrom. Das Umlenken der Stoffströme bewirkt an der Rohrwand eine Verbesserung des Wärmeüberganges. Die Doppelmantelkonstruktion wird jedoch sehr lang und der Druckverlust entsprechend hoch.Out DE 28 08 854 C3 is a conventional usage of the term "static mixer" designated flow channel for heat exchange with internals of parallel groups of intersecting, at their intersections interconnected webs known. This device mainly mixes the material flow. The deflection of the streams causes the pipe wall to improve the heat transfer. However, the double-jacket construction becomes very long and the pressure loss correspondingly high.

Ein Strömungskanal der eingangs genannten Art ist aus EP 1 067 352 B1 bekannt.A flow channel of the type mentioned is out EP 1 067 352 B1 known.

Darstellung der ErfindungPresentation of the invention

Der Erfindung liegt die Aufgabe zugrunde, einen Strömungskanal der eingangs genannten Art zu schaffen, der insbesondere bei hochviskosen Flüssigkeiten zu einer wesentlichen Verbesserung des Wärmeaustausches führt und den Bau eines kompakten Wärmetauschers ermöglicht.The invention has for its object to provide a flow channel of the type mentioned above, which leads in particular in highly viscous liquids to a significant improvement in heat exchange and allows the construction of a compact heat exchanger.

Zur erfindungsgemässen Lösung der Aufgabe führt, dass jeder Mischeinsatz mindestens achtundzwanzig paarweise gekreuzte Stegplatten aufweist, das Verhältnis der Stegbreite zum Innendurchmesser des Strömungskanals höchstens 0.25, das Verhältnis der Länge des Mischeinsatzes zum Innendurchmesser des Strömungskanals mindestens 0.4 und der Winkel der Stegplatten zur Längsachse des Strömungskanals 30° bis 60° und das Verhältnis des Abstandes zwischen benachbarten Ebenen der sich kreuzenden, die Stegplatten aufweisenden Ebenenscharen zum Innendurchmesser des Strömungskanals höchstens 0.3 und zum Innendurchmesser der Rohre weniger als 6 beträgt.For solving the problem according to the invention, each mixing insert has at least twenty-eight crossed web plates, the ratio of the web width to the inner diameter of the flow channel is at most 0.25, the ratio of the length of the mixing insert to the inner diameter of the flow channel is at least 0.4 and the angle of the web plates to the longitudinal axis of the flow channel 30 ° to 60 ° and the ratio of the distance between adjacent planes of the intersecting, the web plates having plane shares to the inner diameter of the flow channel is at most 0.3 and the inner diameter of the tubes is less than 6.

Bevorzugt beträgt das Verhältnis des Abstandes zwischen benachbarten Ebenen der sich kreuzenden, die Stegplatten aufweisenden Ebenenscharen zum Innendurchmesser der Rohre weniger als 4, insbesondere weniger als 3.Preferably, the ratio of the distance between adjacent planes the intersecting, the web plates having level coulters to the inner diameter of the tubes less than 4, in particular less than 3.

Bei der aus EP 1 067 352 B1 bekannten und im Markt eingeführten Vorrichtung weisen die Stegplatten aus fertigungstechnischen Gründen einen Winkel von 45° auf, und das Verhältnis des definierten senkrechten Stegabstandes zwischen zwei benachbarten Stegplatten zum Rohrdurchmesser ergibt sich mit 0.3 bis 0.35. Bei den verfahrenstechnischen Untersuchungen haben sich diese Geometrien ausserordentlich bewährt und werden zunehmend in High-Tech-Prozessen eingesetzt.At the EP 1 067 352 B1 known and introduced on the market device, the web plates for manufacturing reasons, an angle of 45 °, and the ratio of the defined vertical web distance between two adjacent web plates to the pipe diameter is 0.3 to 0.35. In the field of process engineering, these geometries have proven extremely successful and are increasingly used in high-tech processes.

Da bei Wärmetauschern ein Scale-Up mit einem geometrisch ähnlichen Apparat immer zu einem schlechteren Oberflächen/Volumen-Verhältnis führt, muss mit zusätzlicher Oberfläche, bei der vorliegenden Erfindung mit zusätzlichen Rohren, das Oberflächen/Volumen-Verhältnis verbessert werden.Since a scale-up with a geometrically similar apparatus always leads to a poorer surface / volume ratio in heat exchangers, with additional surface area, in the present invention with additional tubes, the surface / volume ratio must be improved.

Aus Fig. 4 ist jedoch deutlich zu erkennen, dass mit zunehmender Anzahl Rohre die Nusselt-Zahl abnimmt, so dass mit zusätzlichen Rohren kein und nur ein geringer zusätzlicher Wärmübergang erzielt wird.Out Fig. 4 However, it can be clearly seen that with increasing number of tubes the Nusselt number decreases, so that with additional tubes no and only a small additional heat transfer is achieved.

Aus diesem Grund werden erfindungsgemäss zur Verbesserung der Wärmeübertragung zusätzliche Stegplatten eingesetzt. Mit der Erhöhung der Anzahl Stegplatten verringert sich auch das Verhältnis des definierten senkrechten Stegabstandes zwischen zwei benachbarten Stegplatten zum Innendurchmesser des Strömungskanals. Diese zusätzliche Massnahme führt zu einer bis zu 60 % verbesserten Wärmeübertragung.For this reason, according to the invention, additional web plates are used to improve the heat transfer. As the number of web plates increases, so does the ratio of the defined perpendicular web distance between two adjacent web plates to the inner diameter of the flow channel. This additional measure leads to up to 60% improved heat transfer.

Die erwähnte Nusselt-Zahl (Formelzeichen: Nu, nach Wilhelm Nusselt) ist eine dimensionslose Kennzahl aus der Ähnlichkeitstheorie der Wärmeübertragung, die die Verbesserung der Wärmeübertragung von einer Oberfläche misst, wenn man die tatsächlichen Verhältnisse mit den Verhältnissen vergleicht, bei denen nur Wärmeleitung durch eine ruhende Schicht auftreten würde.The mentioned Nusselt number (symbol: Nu, after Wilhelm Nusselt) is a dimensionless measure from the theory of similarity of heat transfer, which measures the improvement of heat transfer from a surface, if one compares the actual conditions with the conditions in which only heat conduction through a dormant layer would occur.

Überraschenderweise tritt beim Unterschreiten des Verhältnisses des vorstehend definierten Stegabstandes zum Innendurchmesser der Rohre unter einen bestimmten Wert eine bislang nicht erklärbare weitere Verbesserung der Wärmeübertragung ein. Dieses Phänomen ist aus der Fig. 5 ersichtlich.Surprisingly, falls below the ratio of the above-defined land distance to the inner diameter of the tubes below a certain value, a hitherto unexplained further improvement of heat transfer. This phenomenon is from the Fig. 5 seen.

Die gekreuzt angeordneten Stegplatten können zur Längsachse des Strömungskanals einen unterschiedlichen Winkel aufweisen. Bevorzugt ist jedoch ein gleicher Winkel.The crossed web plates can have a different angle to the longitudinal axis of the flow channel. However, an equal angle is preferred.

Die Ebenen der zwei sich kreuzenden Ebenenscharen können unterschiedliche Zwischenabstände aufweisen. Bevorzugt ist jedoch ein gleicher Zwischenabstand.The planes of the two intersecting layers of planes can have different distances between them. However, an equal spacing is preferred.

Die Ebenen der zwei sich kreuzenden Ebenenscharen können in der Längsachse des Strömungskanals eine leichte Krümmung aufweisen.The planes of the two intersecting planes of planes can have a slight curvature in the longitudinal axis of the flow channel.

Die Ebenen der dritten Ebenenschar können einen unterschiedlichen Zwischenabstandaufweisen, d.h. die Stegplatten können unterschiedlich breit sein. Bevorzugt ist jedoch ein gleicher Zwischenabstand der Ebenen und dementsprechend eine gleiche Breite aller Stegplatten.The planes of the third layer of planes may have a different pitch, i. The web plates can be different widths. However, an equal spacing of the planes and, accordingly, a same width of all web plates is preferred.

Bevorzugt sind die Mischeinsätze im Strömungskanal hintereinander angeordnet, wobei die aneinander grenzenden Mischeinsätze um einem Winkel von 90° um die Längsachse des Strömungskanals gegeneinander verdreht sind.Preferably, the mixing inserts in the flow channel are arranged one behind the other, wherein the adjacent mixing inserts are rotated by an angle of 90 ° about the longitudinal axis of the flow channel against each other.

Die frei positionierbaren Rohre können an die Stegplatten gelötet oder geschweisst sein, oder die Stegplatten können an die Rohre geschrumpft sein.The freely positionable tubes may be brazed or welded to the web plates, or the web plates may have shrunk to the tubes.

Bei der Verwendung des erfindungsgemässen Strömungskanals als Mischer kann eine zweite Komponente über mindestens ein Rohr mit mindestens einem Loch für einen Flüssigkeitsaustritt, vorzugsweise über mehrere Rohre mit mehreren Löcher, einer ersten, im Strömungskanal fliessenden Komponente beigemischt werden.When using the inventive flow channel as a mixer, a second component via at least one tube with at least one hole for a liquid outlet, preferably via a plurality of tubes with a plurality Holes, a first, flowing in the flow channel component can be admixed.

Im Strömungskanal können mehrere Mischeinsätze hintereinander mit Abständen der maximal dreifachen Länge eines Mischeinsatzes angeordnet sein, wobei die Mischeinsätze nach den Abständen um einem Winkel von 90° gegeneinander verdreht sind.In the flow channel several mixing inserts can be arranged one behind the other with intervals of at most three times the length of a mixing insert, wherein the mixing inserts are rotated by the distances by an angle of 90 ° to each other.

Der erfindungsgemässe Strömungskanal ist als statischer Mischer geeignet.The flow channel according to the invention is suitable as a static mixer.

Kurze Beschreibung der ZeichnungShort description of the drawing

Weitere Vorteile, Merkmale und Einzelheiten ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels sowie anhand der Zeichnung; diese zeigt in

  • Fig. 1 eine Seitenansicht von zwei aneinander grenzenden Mischeinsätzen für einen Strömungskanal;
  • Fig. 2 eine Schrägsicht auf einen Mischeinsatz;
  • Fig. 3 eine Sicht auf einen Mischeinsatz in einem Strömungskanal in Blickrichtung der Längsachse des Strömungskanals;
  • Fig. 4 die Abhängigkeit der Nusselt-Zahl von der Anzahl Rohre in einem Strömungskanal;
  • Fig. 5 die Abhängigkeit der Nusselt-Zahl vom Verhältnis des Stegabstandes zum Rohrinnendurchmesser.
Further advantages, features and details emerge from the following description of an embodiment and with reference to the drawing; this shows in
  • Fig. 1 a side view of two adjacent mixing inserts for a flow channel;
  • Fig. 2 an oblique view of a mixing insert;
  • Fig. 3 a view of a mixing insert in a flow channel in the direction of the longitudinal axis of the flow channel;
  • Fig. 4 the dependence of the Nusselt number on the number of tubes in a flow channel;
  • Fig. 5 the dependence of the Nusselt number on the ratio of the web distance to the pipe inside diameter.

Beschreibung von AusführungsbeispielenDescription of exemplary embodiments

Zwei in Fig. 1 gezeigte, in ihrer Längsachse m aneinander grenzende, eine Länge L aufweisende Mischeinsätze 10, 12 für in einem Strömungskanal strömende Medien weisen gemäss Fig. 2 ein Rohrbündel 14 mit 188 parallel zur Längsachse m angeordneten, sich über die gesamte Länge L erstreckenden Rohren 16 auf. Jeder Mischeinsatz 10, 12 weist eine Vielzahl von sich kreuzenden Stegplatten 18 A, 18 B auf. Die Stegplatten 18 A, 18 B weisen alle eine gleiche Breite b auf und liegen in parallel zueinander mit gleichem Zwischenabstand a angeordneten Ebenen EA, EB, die zwei sich kreuzende Ebenenscharen A, B bilden. Die Ebenen EA der Ebenenschar A schliessen mit der Längsachse m jeweils einen gleich grossen Winkel αA, αB von 45° ein.Two in Fig. 1 shown, in their longitudinal axis m adjacent, a length L having mixing inserts 10, 12 for flowing in a flow channel media have according to Fig. 2 a tube bundle 14 with 188 arranged parallel to the longitudinal axis m, over the entire length L extending tubes 16. Each mixing insert 10, 12 has a plurality of intersecting web plates 18 A, 18 B. The web plates 18 A, 18 B all have an equal width b and lie in parallel to each other with the same spacing a arranged planes EA, EB, the two intersecting plane shares A, B form. The planes EA of the plane group A include with the longitudinal axis m in each case an equal angle αA, αB of 45 °.

Parallel zueinander mit einem der Breite b der Stegplatten 18 A, 18 B entsprechenden Zwischenabstand b angeordnete Ebenen EC einer dritten Ebenenschar C verlaufen parallel zur Längsachse m und schneiden die Ebenen EA, EB der zwei sich kreuzenden Ebenenscharen A, B rechtwinklig. Hierbei bilden die Schnittlinien der Ebenen EA, EB der zwei sich kreuzenden Ebenenscharen A, B mit den Ebenen EC der dritten Ebenenschar C Längskanten 20 A, 20 B der zwischen benachbarten Ebenen EC alternierend in den Ebenen EA, EB der zwei sich kreuzenden Ebenenscharen A, B angeordneten Stegplatten 18 A, 18 B.Parallel to each other with one of the width b of the web plates 18 A, 18 B corresponding intermediate distance b arranged planes EC a third plane group C parallel to the longitudinal axis m and intersect the planes EA, EB of the two intersecting plane shares A, B at right angles. Here, the lines of intersection of the planes EA, EB of the two intersecting planes A, B form the planes EC of the third plane group C longitudinal edges 20 A, 20 B alternately between adjacent planes EC in the planes EA, EB of the two intersecting planes A, B arranged web plates 18 A, 18 B.

Wie in Fig. 1 gezeigt, sind die aneinander grenzenden Mischeinsätze 10, 12 um einen Winkel von 90° um ihre Längsachse m gegeneinander verdreht angeordnet.As in Fig. 1 are shown, the adjoining mixing inserts 10, 12 arranged at an angle of 90 ° about its longitudinal axis m against each other.

In Fig. 3 sind die um einen Winkel von 90° um ihre Längsachse m gegeneinander verdrehten Mischeinsätze 10, 12 in einem rohrförmigen Strömungskanal 22 mit einer Innenmantelfläche 24 mit kreisförmigem Querschnitt, einem Innendurchmesser Di und einer Rohr- oder Strömungskanallängsachse x angeordnet. Hierbei Liegen die Längsachsen m der Mischeinsätze 10, 12 in der Längsachse x des Strömungskanals 22.In Fig. 3 are the by an angle of 90 ° about its longitudinal axis m against each other twisted mixing inserts 10, 12 arranged in a tubular flow channel 22 having an inner circumferential surface 24 with a circular cross-section, an inner diameter Di and a pipe or Strömungskanallängsachse x. In this case, the longitudinal axes m of the mixing inserts 10, 12 lie in the longitudinal axis x of the flow channel 22.

Sämtliche Stegplatten 18 A, 18 B erstrecken sich innerhalb jedes Mischeinsatzes 10, 12 über jeweils ihre durch die Stirnseiten der Mischeinsätze 10, 12 und durch die Innenwand des Strömungskanals begrenzte, maximal mögliche Länge, wobei die Kontur der Stegplatten 18 A, 18 B dem kreisförmigen Querschnitt des Strömungskanals 22 so angepasst ist, dass die Stegplatten 18 A, 18 B mit kleinem Spiel an die Innenmantelfläche 24 des Strömungskanals 22 angrenzen.All web plates 18 A, 18 B extend within each mixing insert 10, 12 via their respective maximum through the end faces of the mixing inserts 10, 12 and through the inner wall of the flow channel, maximum length, the contour of the web plates 18 A, 18 B the circular Cross-section of the flow channel 22 is adapted so that the web plates 18 A, 18 B adjoin the inner circumferential surface 24 of the flow channel 22 with a small clearance.

Die Rohre 16 durchsetzen die Stegplatten 18 A, 18 B über in diesen angeordnete Öffnungen, die entsprechend dem Winkel zwischen Stegplatte 18 A, 18 B und Rohr 16 eine elliptische Randbegrenzung aufweisen. Die Rohre 16 sind im Bereich der Öffnungen über eine Löt- oder Schweissstelle an den Stegplatten 18 A, 18 B befestigt. Ebenso sind die Stegplatten 18 A, 18 B an ihren Kreuzungsstellen über Löt- oder Schweissstellen miteinander verbunden.The tubes 16 pass through the web plates 18 A, 18 B via openings arranged in these, which have according to the angle between the web plate 18 A, 18 B and tube 16 an elliptical edge boundary. The tubes 16 are secured in the region of the openings via a soldering or welding point on the web plates 18 A, 18 B. Likewise, the web plates 18 A, 18 B are connected to each other at their intersections via soldering or welding points.

Beim Zusammenbau eines Mischer-Wärmetauschers werden die einzelnen Mischeinsätze 10, 12 durch die gekreuzte Anordnung der entsprechenden Anzahl von Stegplatten 18 A, 18 B vorgefertigt. Die vorgefertigten Mischeinsätze 10, 12 werden um 90° gegeneinander verdreht in ihrer Längsachse m aneinandergereiht. Anschliessend werden die Rohre 16 parallel zur Längsachse m durch die Öffnungen in den Stegplatten 18 A, 18 B hindurch geschoben und an diesen befestigt. Das so gefertigte Einsatzteil wird nachfolgend in den Strömungskanal eingeschoben.When assembling a mixer-heat exchanger, the individual mixing inserts 10, 12 by the crossed arrangement of the corresponding number of web plates 18 A, 18 B prefabricated. The prefabricated mixing inserts 10, 12 are rotated by 90 ° against each other in their longitudinal axis m strung together. Subsequently, the tubes 16 are pushed parallel to the longitudinal axis m through the openings in the web plates 18 A, 18 B and secured thereto. The insert thus manufactured is subsequently inserted into the flow channel.

In Fig. 5 sind die Ergebnisse von Messungen der Wärmeübertragung an drei unterschiedlich aufgebauten Strömungskanälen S1, S2, S3 als Nusseltzahl (Nu) in Abhängigkeit vom Verhältnis Stegabstand (a) / Rohrinnendurchmesser (di) bei einer konstanten Referenz-Pecletzahl (Peref) grafisch dargestellt. Der Aufbau der Strömungskanäle S1, S2, S3 ist aus der nachstehenden Tabelle ersichtlich. Tabelle: Aufbau der untersuchten Strömungskanäle Strömungskanal S1 S2 S3 Innendurchmesser (Di) des Strömungskanals [mm] 145 279.3 358 Anzahl Rohre 52 180 180 Innendurchmesser (di) der Rohre [mm] 10 10 10 In Fig. 5 the results of measurements of the heat transfer at three differently constructed flow channels S1, S2, S3 as Nusseltzahl (Nu) as a function of the ratio web distance (a) / tube inner diameter (di) at a constant reference Pecleteahl (Pe ref ) are shown graphically. The structure of the flow channels S1, S2, S3 can be seen from the table below. Table: Structure of the investigated flow channels flow channel S1 S2 S3 Inner diameter (Di) of the flow channel [mm] 145 279.3 358 Number of pipes 52 180 180 Inner diameter (di) of the tubes [mm] 10 10 10

Der Stegabstand (a) ergibt sich aus dem Messwerten aus dem Verhältnis Stegabstand (a) / Rohrinnendurchmesser (di) in Fig. 5. Aus der Fig. 5 ist der überraschende Effekt, dass der Wärmeübergang beim Unterschreiten eines bestimmten Verhältnisses plötzlich unerwartet ansteigt, klar ersichtlich.The web distance (a) results from the measured values from the ratio web distance (a) / pipe internal diameter (di) in Fig. 5 , From the Fig. 5 is the surprising effect that the heat transfer suddenly rises unexpectedly when falling below a certain ratio, clearly visible.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
erster Mischeinsatzfirst mixed use
1212
zweiter Mischeinsatzsecond mixing insert
1414
Rohrbündeltube bundle
1616
RohreTube
18 A, B18 A, B
Stegplattenwall sheets
2020
Längskantenlongitudinal edges
2222
Strömungskanalflow channel
2424
InnenmantelflächeInner surface area
EAEA
erste Ebenenfirst levels
EBEB
zweite Ebenensecond levels
ECEC
dritte Ebenenthird levels
AA
erste Ebenenscharfirst level crowd
BB
zweite Ebenenscharsecond level crowd
CC
dritte Ebenenscharthird level group
LL
Länge von 10, 12Length of 10, 12
aa
Zwischenabstand von EA, EBDistance between EA, EB
bb
Zwischenabstand von EC (Breite der Stegplatten 15 A, B)Distance between EC (width of web plates 15 A, B)
mm
Längsachse von 10, 12Longitudinal axis of 10, 12
xx
Längsachse von 22Longitudinal axis of 22

Claims (11)

  1. A flow channel for a mixer heat exchanger, which flow channel (22) is of tubular design with a longitudinal axis (x) and with an inner surface area of circular cross section with an inside diameter (Di) and having at least one mixing insert (10, 12) of a length (L) with a multiplicity of tubes (16) guided parallel to the longitudinal axis (x) of the flow channel (22) over the length (L) of the mixing insert (10, 12) and having an inside diameter (di) having a multiplicity of crosswise arranged web plates (18A, 18B) of a width (b) which forms with the longitudinal axis (x) of the flow channel (22) an angle (α), the web plates (18A, 18B) being arranged in two mutually intersecting plane groups (A, B) having a multiplicity of parallel planes (EA, EB) with a mutual spacing (a), and a third plane group (C) which has a multiplicity of parallel planes (EC) with a mutual spacing (b) corresponding to the width (b) of the web plates (18A, 18B) intersecting the two mutually intersecting plane groups (A, B) at right angles, the intersection lines of the planes (EA, EB) of the two mutually intersecting plane groups (A, B) forming, with the planes (EC) of the third plane group (C), longitudinal edges (20) of the web plates (18A, 18B) arranged between adjacent planes (EC) of the third plane group (C) alternately in the planes (EA, EB) of the two mutually intersecting plane groups (A, B), the tubes (16) being led through orifices in the web plates (18A, 18B) and being fastened to the web plates (18A, 18B), characterized in that each mixing insert (10, 12) has at least twenty eight web plates (18A, 18B) crossed in pairs, the ratio of the width (b) of the web plates (18A, 18B) to the inside diameter (Di) of the flow channel (22) amounts to at most 0.25, the ratio of the length (L) of the mixing insert (10, 12) to the inside diameter (Di) of the flow channel (22) amounts to at least 0.4 and the angle (α) of the web plates (18A, 18A) to the longitudinal axis (x) of the flow channel (22) amounts to 30° to 60°, and the ratio of the mutual spacing (a) of adjacent planes (EA, EB) of the mutually intersecting plane groups (EA, EB) having the web plates (18A, 18B) to the inside diameter (Di) of the flow channel (22) amounts to at most 0.3 and to the inside diameter (di) of the tubes (16) amounts to less than 6.
  2. The flow channel as claimed in claim 1, characterized in that the ratio of the mutual spacing (a) of adjacent planes (EA, EB) of the mutual intersecting plane groups (EA, EB) having the web plates (18A, 18B) to the inside diameter (di) of the tubes (16) amounts to less than 4, preferably to less than 3.
  3. The flow channel as claimed in claim 1, characterized in that the crosswise arranged web plates (18A, 18B) have an identical angle (α) to the longitudinal axis (x) of the flow channel (22).
  4. The flow channel as claimed in claim 1, characterized in that the planes (EA, EB) of the two mutually intersecting plane groups (A, B) have an identical mutual spacing (a).
  5. The flow channel as claimed in claim 1, characterized in that the planes (EA, EB) of the two mutually intersecting plane groups (A, B) have a slight curvature in the longitudinal axis (x) of the flow channel (20).
  6. The flow channel as claimed in claim 1, characterized in that the planes (EC) to the third plane group (C) have an identical mutual spacing (b) corresponding to the width (b) of the web plates (18A, 18B).
  7. The flow channel as claimed in claim 1, characterized in that the mixing inserts (10, 12) are arranged one behind the other in the flow channel (22), the mutually contiguous mixing inserts (10, 12) being rotated at an angle of 90° about the longitudinal axis (x) of the flow channel (22) with respect to one another.
  8. The flow channel as claimed in claim 1, characterized in that the tubes (14) are freely positionable.
  9. The flow channel as claimed in claim 1, characterized in that at least one tube (14) has at least one hole for fluid outflow.
  10. The flow channel as claimed in claim 1, characterized in that a plurality of mixing inserts (10, 12) are arranged one behind the other in the flow channel (22) with spacings corresponding to at most three times the length (L) of a mixing insert (10, 12), the mixing inserts (10, 12) being rotated at an angle of 90° with respect to one another according to the spacings.
  11. The use of a flow channel (22) as claimed in one of the preceding claims as a static mixer.
EP08748356A 2007-05-24 2008-05-20 Flow channel for a mixer-heat exchanger Active EP2150765B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08748356A EP2150765B1 (en) 2007-05-24 2008-05-20 Flow channel for a mixer-heat exchanger

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP07405151 2007-05-24
EP08748356A EP2150765B1 (en) 2007-05-24 2008-05-20 Flow channel for a mixer-heat exchanger
PCT/CH2008/000226 WO2008141472A1 (en) 2007-05-24 2008-05-20 Flow channel for a mixer-heat exchanger

Publications (2)

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EP2150765A1 EP2150765A1 (en) 2010-02-10
EP2150765B1 true EP2150765B1 (en) 2011-02-16

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US (1) US8628233B2 (en)
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AT (1) ATE498810T1 (en)
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WO (1) WO2008141472A1 (en)

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AU2017202129B2 (en) 2016-03-30 2022-02-03 Woodside Energy Technologies Pty Ltd Heat Exchanger and Method of Manufacturing a Heat Exchanger
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WO2008141472A1 (en) 2008-11-27
US20100163216A1 (en) 2010-07-01
EP2150765A1 (en) 2010-02-10
DE502008002619D1 (en) 2011-03-31
US8628233B2 (en) 2014-01-14
ATE498810T1 (en) 2011-03-15

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