EP0634207A1 - Combined mixing and direction-changing device - Google Patents

Combined mixing and direction-changing device Download PDF

Info

Publication number
EP0634207A1
EP0634207A1 EP94110282A EP94110282A EP0634207A1 EP 0634207 A1 EP0634207 A1 EP 0634207A1 EP 94110282 A EP94110282 A EP 94110282A EP 94110282 A EP94110282 A EP 94110282A EP 0634207 A1 EP0634207 A1 EP 0634207A1
Authority
EP
European Patent Office
Prior art keywords
flow
guide arrangement
guide
flow channel
flow medium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94110282A
Other languages
German (de)
French (fr)
Other versions
EP0634207B1 (en
Inventor
Dipl.-Ing. Herr Wolfgang
Ralf Dipl.-Ing. Sigling
Horst Dipl.-Ing. Spielmann
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 AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0634207A1 publication Critical patent/EP0634207A1/en
Application granted granted Critical
Publication of EP0634207B1 publication Critical patent/EP0634207B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30Injector mixers
    • B01F25/31Injector mixers in conduits or tubes through which the main component flows
    • B01F25/313Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • B01F25/3132Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit by using two or more injector devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30Injector mixers
    • B01F25/31Injector mixers in conduits or tubes through which the main component flows
    • B01F25/313Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • B01F25/3131Injector 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30Injector mixers
    • B01F25/31Injector mixers in conduits or tubes through which the main component flows
    • B01F25/313Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • B01F25/3132Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit by using two or more injector devices
    • B01F25/31322Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit by using two or more injector devices used simultaneously
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40Static mixers
    • B01F25/42Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction

Definitions

  • the invention relates to a combined mixing and deflection device for a flow medium with a guide arrangement and a flow channel bent at a kink.
  • guide vanes are known for deflecting a flow medium, which deflect the flow medium from a first flow direction into a second desired flow direction that is different by a deflection angle ⁇ .
  • guide vanes have a curved profile, which is initially aligned parallel to the incoming flow, then deflects the flow on a piece that is usually circular-arc-shaped and then runs out in the direction of the desired flow direction.
  • static mixers are known for mixing a flow medium.
  • static mixers are known that have a variety of deflecting elements distributed regularly over the cross section of the flow channel, the dimensions of the deflecting elements being small in relation to the dimensions of the flow channel and the deflecting elements being arranged at an angle to the main flow direction of the flow medium.
  • intensive mixing of the flow medium is achieved locally and across the entire cross section of the flow channel.
  • the invention is therefore based on the object of demonstrating a way in which a deflection and a mixing of a flow medium are to be carried out with an extremely small space requirement.
  • a combined mixing and deflecting device for a flow medium comprises a guide arrangement for deflecting the flow medium from a main flow direction, the guide arrangement being arranged in the region of a kink in a flow channel, the plane of the guide arrangement being approximately parallel to the direction , which the flow channel has in the flow direction of the flow medium after the kink, is aligned and the guide arrangement has openings which are uniformly distributed over the cross section of the flow channel.
  • the blocking ratio is approximately 0.35 to 0.65, preferably approximately 0.5, the blocking ratio being the ratio of the area of the Breakthroughs to the total area of the guide arrangement is defined.
  • the guide arrangement comprises a plurality of uniformly spaced guide vanes which are essentially arranged in one plane. It is particularly advantageous if the guide vanes are trapezoidal and are alternately aligned with the narrow and wide edge to the flow of the flow medium.
  • FIG. 1 shows a first guide arrangement 2, which is designed here as a guide plate 2.
  • the guide plate 2 comprises a metallic frame 4.
  • the frame 4 has a rectangular base. Between a first longitudinal side part, hereinafter referred to as the leading edge 6, and a second longitudinal side part, hereinafter referred to as the trailing edge 8, five trapezoidal guide vanes 10a to 10e are installed, which are spaced evenly apart alternately with the narrow and the wide side on the leading and trailing edge 6, 8 are attached. Openings 12 are enclosed by the frame 4 and the guide flags 10a to 10e. These can be punched out openings.
  • the guide vanes 10a to 10e can also be attached to the frame 4 by welding.
  • the blocking ratio of the guide plate 2 is approximately 0.54, the blocking ratio being defined as the ratio of the area of the openings 12 to the total area of the guide plate 2.
  • the leading edge 6 and trailing edge 8 are bent in opposite directions when viewed on the surface according to FIG. 1. This will become clear later with reference to FIG. 3.
  • a transverse side of the frame 4 is designated 4a.
  • FIG. 2 shows a second guide arrangement 14, which also comprises five trapezoidal guide vanes 16a-16e, which are each fastened to opposite inner walls of a flow channel 24 by means of two support tubes 18.
  • the guide vanes 16a-16e each have their own leading edges 20 and trailing edges 22, which are bent away in the opposite direction.
  • the blocking ratio of this guide arrangement 14 is about 60%.
  • the plate level of the guide arrangement 2, 14 is in each case the representation level in FIGS. 1 and 2.
  • Figure 3 shows a schematic representation of a section of a flue gas duct 24 of an incinerator, not shown.
  • a kink region 26 and a 90 ° deflection 28 can be seen in the flue gas duct 24.
  • the deflection by 90 ° of a flue gas 30 heavily loaded with dust and nitrogen oxides is effected by means of guide vanes 32 installed in the 90 ° deflection 28.
  • the guide plate 2 shown in FIG. 1 is installed in the flue gas duct 24 on connecting pieces, here rod-shaped bases 34.
  • a section parallel to the transverse side 4a of the metallic frame 4 of FIG. 1 is shown.
  • the plane 36 of the guide plate 2 is oriented approximately parallel to the direction which the flue gas 30 has in the flow direction thereof after the kink region 26.
  • the plane 36 of the guide plate 2 is approximately aligned in the direction of gravity, as a result of which the dust located in the flue gas 30 is largely avoided on the guide plate 2.
  • an ammonia injection device 38 is also installed, by means of which ammonia gas can be supplied to the flue gas 30, which is subsequently used in a DeNO x system (not shown further here) for the catalytic conversion of the nitrogen oxides.
  • a bypass duct 40 opens into the flue gas duct 24.
  • a part 42 of the flue gas that has previously branched off from the rest of the flue gas 30 flows through the bypass duct 40.
  • the part 42 flowing through the bypass duct 40 can, for example, be considerably hotter than the flue gas 30 flowing in the flue gas duct 24, because its heat content has previously been used in a waste heat boiler (not shown here) to generate steam.
  • the guide plate 2 installed in the kink area 26 fulfills three functions simultaneously.
  • the guide plate 2 effects a deflection of the flue gas 30 in the flow direction of the flue gas 30 after the kink region 26 in accordance with the orientation of its guide vanes 10a-10e.
  • the flue gas deflected by the guide vanes 10a-10e is raised around the edges of the guide vanes 10a-10e deflected turbulent flow paths, whereby mixing of the hot part 42 with the remaining flue gas 30 is achieved.
  • the turbulent flows induced by means of the guide plate 2 ensure that the ammonia gas injected directly into the kink region 26 is mixed homogeneously with the flue gas 30.
  • the pressure drop caused by the guide plate 2 set up at an angle to the main flow direction is only approximately 1.0 mbar. This low pressure drop is so low because, in the exemplary embodiment, only five guide vanes 10a to 10e are set up almost parallel to the flow direction of the flue gas 30 after the kink region 26. In general, a number of 4 - 10 guide vanes per guide plate 2 is useful. Such a division results, as already shown, in the negligible pressure drop as well as a sufficiently good mixing and deflection of the flue gas 30 in the area after the kink 26.
  • the guide arrangement 14 shown in FIG. 2 could have been installed at this point in the flow channel 24.
  • attachment of the support tubes 18 directly to the inner walls of the flue gas duct 24 is conceivable.
  • the support tubes 18 can also be attached to the bases 34 shown in FIG. 3 just as well.
  • the shape of the guide vanes 10a to 10e, 16a to 16e can also be rectangular, triangular, semi-circular or semi-elliptical.

Landscapes

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

Abstract

In order to achieve sufficiently good change in direction and mixing of a fluid medium with a very low space requirement in the flow channel, a combined mixing and deflecting device is provided having a guide arrangement (2, 14) and a flow channel (24) bent at a bending point (26), the guide arrangement (2, 14) being arranged to the flow channel in the region of the bending point (26), the plane (36) of the guide arrangement (2, 14) being virtually parallel to the direction which the flow channel (24) has in the direction of flow of the fluid medium (30) after the bending point (26), and the guide arrangement (2, 14) having through-holes (12) uniformly distributed over the cross-section of the flow channel (24). The invention is suitable with all liquid, gaseous fluid media for deflecting and mixing the fluid medium in a flow channel. <IMAGE>

Description

Die Erfindung bezieht sich auf eine kombinierte Misch- und Umlenkeinrichtung für ein Strömungsmedium mit einer Leitanordnung und einem an einer Knickstelle abgeknickten Strömungskanal.The invention relates to a combined mixing and deflection device for a flow medium with a guide arrangement and a flow channel bent at a kink.

Zur Umlenkung eines Strömungsmediums sind sogenannte Leitschaufeln bekannt, die das Strömungsmedium aus einer ersten Strömungsrichtung in eine zweite gewünschte, um einen Umlenkwinkel α verschiedene Strömungsrichtung umlenken. Dazu haben Leitschaufeln ein gebogenes Profil, das zunächst parallel zur anströmenden Strömung ausgerichtet ist, dann auf einem meist kreisbogenähnlichen Stück die Strömung umlenkt und anschließend in Richtung der gewünschten Strömungsrichtung ausläuft. Hierbei ist besonders bei Leitschaufeln, die in Umlenkungen mit relativ kleinen Umlenkwinkeln eingebaut sind, nachteiligerweise zu tolerieren, daß die Leitschaufeln den Strömungskanal in Strömungsrichtung des Strömungsmediums im Bereich der Umlenkung für das Strömungsmedium "blickdicht" machen müssen, damit die Leitschaufeln eine Umlenkung des Strömungsmediums erzwingen. Dies bedeutet im einzelnen, daß sich die Leitschaufeln besonders weit in den nach der Umlenkung befindlichen Strömungskanal erstrecken, was einen besonders hohen Platzbedarf im Nachlaufgebiet der Leitschaufeln erforderlich macht. Aufgrund des dabei meist auftretenden großen Druckunterschiedes zwischen Lee- und Luvseite der Leitschaufel bestehen im besonderen bei im Winkel zur Schwerkraft ausgerichteten Leitschaufeln besonders große Bereiche, in denen sich im Strömungsmedium vorhandene Partikel ablagern können.So-called guide vanes are known for deflecting a flow medium, which deflect the flow medium from a first flow direction into a second desired flow direction that is different by a deflection angle α. For this purpose, guide vanes have a curved profile, which is initially aligned parallel to the incoming flow, then deflects the flow on a piece that is usually circular-arc-shaped and then runs out in the direction of the desired flow direction. In this case, particularly in the case of guide vanes which are installed in deflections with relatively small deflection angles, it is disadvantageously tolerated that the guide vanes in the direction of flow of the flow medium have to make the flow channel “opaque” in the region of the deflection for the flow medium so that the guide vanes force a deflection of the flow medium . In particular, this means that the guide vanes extend particularly far into the flow channel located after the deflection, which requires a particularly large amount of space in the wake region of the guide vanes. Due to the large pressure difference that usually occurs between the leeward and windward side of the guide vane, especially in the case of guide vanes oriented at an angle to gravity, there are particularly large areas in which particles present in the flow medium can be deposited.

Zur Vermischung eines Strömungsmediums sind eine Vielzahl von statischen Mischern bekannt. Aus der DE-OS 41 23 161 sind beispielsweise statische Mischer bekannt, die eine Vielzahl von regelmäßig über den Querschnitt des Strömungskanals verteilte Auslenkelemente aufweisen, wobei die Abmessungen der Auslenkelemente im bezug zu den Abmessungen des Strömungskanals klein sind und die Auslenkelemente in einem Winkel zur Hauptströmungsrichtung des Strömungsmediums angeordnet sind. Mit solchen statischen Mischern wird eine intensive Vermischung des Strömungsmediums lokal und über den gesamten Querschnitt des Strömungskanals hinweg erreicht.A large number of static mixers are known for mixing a flow medium. From DE-OS 41 23 161, for example, static mixers are known that have a variety of deflecting elements distributed regularly over the cross section of the flow channel, the dimensions of the deflecting elements being small in relation to the dimensions of the flow channel and the deflecting elements being arranged at an angle to the main flow direction of the flow medium. With such static mixers, intensive mixing of the flow medium is achieved locally and across the entire cross section of the flow channel.

Nachteiligerweise ist mit diesen statischen Mischern keine Änderung der Hauptströmungsrichtung des Strömungsmediums zu erzielen. Ist aber eine Änderung der Hauptströmungsrichtung und eine Vermischung des Strömungsmediums gewünscht, so ist es üblich, eine Umlenkeinrichtung, wie z.B. Leitschaufeln, und zusätzlich eine Mischeinrichtung, wie z.B. einen statischen Mischer, zu verwenden. Im besonderen bei Umlenkungen mit kleinem Umlenkwinkel, d. h. mit Winkeln kleiner als 90°, kann der Platzbedarf für die Umlenkeinrichtung und die Mischeinrichtung größer sein als der in dem Strömungskanal zur Verfügung stehende Raum.Disadvantageously, no change in the main direction of flow of the flow medium can be achieved with these static mixers. However, if a change in the main flow direction and a mixing of the flow medium is desired, it is common to use a deflection device, e.g. Guide vanes, and in addition a mixing device, e.g. a static mixer. In particular for deflections with a small deflection angle, i.e. H. with angles smaller than 90 °, the space required for the deflection device and the mixing device can be larger than the space available in the flow channel.

Der Erfindung liegt daher die Aufgabe zugrunde, einen Weg aufzuzeigen, in welcher Weise eine Umlenkung und eine Vermischung eines Strömungsmediums mit einem äußerst geringen Platzbedarf durchzuführen sind.The invention is therefore based on the object of demonstrating a way in which a deflection and a mixing of a flow medium are to be carried out with an extremely small space requirement.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß eine kombinierte Misch- und Umlenkeinrichtung für ein Strömungsmedium eine Leitanordnung zur Ablenkung des Strömungsmediums aus einer Hauptströmungsrichtung umfaßt, wobei die Leitanordnung im Bereich einer Knickstelle in einem Strömungskanal angeordnet ist, die Ebene der Leitanordnung annähernd parallel zu der Richtung, die der Strömungskanal in Strömungsrichtung des Strömungsmediums nach der Knickstelle hat, ausgerichtet ist und die Leitanordnung über den Querschnitt des Strömungskanals gleichmäßig verteilte Durchbrüche aufweist.This object is achieved in that a combined mixing and deflecting device for a flow medium comprises a guide arrangement for deflecting the flow medium from a main flow direction, the guide arrangement being arranged in the region of a kink in a flow channel, the plane of the guide arrangement being approximately parallel to the direction , which the flow channel has in the flow direction of the flow medium after the kink, is aligned and the guide arrangement has openings which are uniformly distributed over the cross section of the flow channel.

Hierdurch wird erreicht, daß das Strömungsmedium aufgrund der Ausrichtung der Leitanordnung zumindest teilweise in die gewünschte Strömungsrichtung nach der Knickstelle umgelenkt wird, und daß der nicht umgelenkte Teil des Strömungsmediums an den Rändern der Durchbrüche verwirbelt wird. Unmittelbar im Bereich hinter der kombinierten Misch- und Umlenkeinrichtung vermischt sich der umgelenkte Teil des Strömungsmediums mit dem verwirbelten Teil des Strömungsmediums, so daß das Strömungsmedium hinreichend umgelenkt und hinreichend turbulent hinter der Knickstelle abströmt. Aufgrund der gleichmäßigen Verteilung der Durchbrüche wird erreicht, daß auf der Leeseite (Windschattenseite) der Leitanordnung nur sehr geringe Strömungstoträume aufgebaut werden, so daß auch eine Ablagerung von im Strömungsmedium enthaltenen Partikeln besonders gering ist.This ensures that the flow medium is at least partially deflected into the desired flow direction after the kink due to the orientation of the guide arrangement, and that the non-deflected part of the flow medium is swirled at the edges of the openings. Immediately in the area behind the combined mixing and deflecting device, the deflected part of the flow medium mixes with the swirled part of the flow medium, so that the flow medium is deflected sufficiently and flows out behind the kink sufficiently turbulently. Due to the uniform distribution of the breakthroughs it is achieved that only very small flow dead spaces are built up on the leeward side (slipstream side) of the guide arrangement, so that a deposition of particles contained in the flow medium is also particularly low.

Um eine hinreichend gute Umlenkung und Vermischung des Strömungsmediums bei gleichzeitig relativ geringem Druckabfall zu erreichen, ist es vorteilhaft, wenn das Versperrungsverhältnis etwa 0,35 bis 0,65, vorzugsweise etwa 0,5, beträgt, wobei das Versperrungsverhältnis als das Verhältnis der Fläche der Durchbrüche zur Gesamtfläche der Leitanordnung definiert ist.In order to achieve a sufficiently good deflection and mixing of the flow medium with a relatively low pressure drop at the same time, it is advantageous if the blocking ratio is approximately 0.35 to 0.65, preferably approximately 0.5, the blocking ratio being the ratio of the area of the Breakthroughs to the total area of the guide arrangement is defined.

Eine einfache konstruktive Ausgestaltung des Erfindungsgedankens ergibt sich, wenn die Leitanordnung mehrere gleichmäßig beabstandete, untereinander im wesentlichen in einer Ebene angeordnete Leitfahnen umfaßt. Dabei ist es besonders vorteilhaft, wenn die Leitfahnen trapezförmig sind und abwechselnd mit der schmalen und breiten Kante zur Strömung des Strömungsmediums ausgerichtet sind.A simple constructive embodiment of the concept of the invention results if the guide arrangement comprises a plurality of uniformly spaced guide vanes which are essentially arranged in one plane. It is particularly advantageous if the guide vanes are trapezoidal and are alternately aligned with the narrow and wide edge to the flow of the flow medium.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind den übrigen Unteransprüchen zu entnehmen.Further advantageous embodiments of the invention can be found in the remaining subclaims.

Ausführungsbeispiele der Erfindung werden nachstehend anhand von drei Figuren erläutert. Dabei zeigen:

Figur 1
eine Aufsicht auf eine erste Leitanordnung;
Figur 2
eine Aufsicht auf eine zweite Leitanordnung; und
Figur 3
einen Ausschnitt aus dem Rauchgaskanal einer Verbrennungsanlage.
Exemplary embodiments of the invention are explained below with reference to three figures. Show:
Figure 1
a supervision of a first guide arrangement;
Figure 2
a supervision of a second guide arrangement; and
Figure 3
a section of the flue gas duct of an incinerator.

In Figur 1 ist in Aufsicht eine erste Leitanordnung 2 dargestellt, die hier als Leitplatte 2 ausgebildet ist. Die Leitplatte 2 umfaßt einen metallischen Rahmen 4. Der Rahmen 4 hat eine rechteckige Grundfläche. Zwischen einem ersten Längsseitenteil, nachfolgend als Anströmkante 6 bezeichnet, und einem zweiten Längsseitenteil, nachfolgend als Abströmkante 8 bezeichnet, sind fünf trapezförmige Leitfahnen 10a bis 10e eingebaut, die gleichmäßig beabstandet abwechselnd mit der schmalen und der breiten Seite an der An- bzw. der Abströmkante 6, 8 befestigt sind. Von dem Rahmen 4 und den Leitfahnen 10a bis 10e sind Durchbrüche 12 eingeschlossen. Hierbei kann es sich um ausgestanzte Durchbrüche handeln. Auch können die Leitfahnen 10a bis 10e durch Schweißen am Rahmen 4 befestigt sein. Das Versperrungsverhältnis der Leitplatte 2 beträgt im Ausführungsbeispiel etwa 0,54, wobei das Versperrungsverhältnis als das Verhältnis der Fläche der Durchbrüche 12 zur Gesamtfläche der Leitplatte 2 definiert ist. Die Anströmkante 6 und Abströmkante 8 sind - bei Betrachtung auf die Fläche gemäß Figur 1 - gegensinnig abgeknickt. Dies wird später anhand von Figur 3 deutlich werden. Eine Querseite des Rahmens 4 ist mit 4a bezeichnet.FIG. 1 shows a first guide arrangement 2, which is designed here as a guide plate 2. The guide plate 2 comprises a metallic frame 4. The frame 4 has a rectangular base. Between a first longitudinal side part, hereinafter referred to as the leading edge 6, and a second longitudinal side part, hereinafter referred to as the trailing edge 8, five trapezoidal guide vanes 10a to 10e are installed, which are spaced evenly apart alternately with the narrow and the wide side on the leading and trailing edge 6, 8 are attached. Openings 12 are enclosed by the frame 4 and the guide flags 10a to 10e. These can be punched out openings. The guide vanes 10a to 10e can also be attached to the frame 4 by welding. In the exemplary embodiment, the blocking ratio of the guide plate 2 is approximately 0.54, the blocking ratio being defined as the ratio of the area of the openings 12 to the total area of the guide plate 2. The leading edge 6 and trailing edge 8 are bent in opposite directions when viewed on the surface according to FIG. 1. This will become clear later with reference to FIG. 3. A transverse side of the frame 4 is designated 4a.

Figur 2 zeigt eine zweite Leitanordnung 14, die auch fünf trapezförmige Leitfahnen 16a - 16e umfaßt, die mittels jeweils zweier Tragrohre 18 an gegenüberliegenden Innenwänden eines Strömungskanals 24 befestigt sind. Die Leitfahnen 16a - 16e verfügen jeweils über eigene Anströmkanten 20 und Abströmkanten 22, die in entgegengesetzter Richtung weggebogen sind. Das Versperrungsverhältnis dieser Leitanordnung 14 beträgt etwa 60 %. Die Plattenebene der Leitanordnung 2, 14 ist in den Figuren 1 und 2 jeweils die Darstellungsebene.FIG. 2 shows a second guide arrangement 14, which also comprises five trapezoidal guide vanes 16a-16e, which are each fastened to opposite inner walls of a flow channel 24 by means of two support tubes 18. The guide vanes 16a-16e each have their own leading edges 20 and trailing edges 22, which are bent away in the opposite direction. The blocking ratio of this guide arrangement 14 is about 60%. The plate level of the guide arrangement 2, 14 is in each case the representation level in FIGS. 1 and 2.

Figur 3 zeigt in schematischer Darstellung einen Ausschnitt aus einem Rauchgaskanal 24 einer nicht weiter dargestellten Verbrennungsanlage. In dem Rauchgaskanal 24 sind ein Knickbereich 26 und eine 90°-Umlenkung 28 erkennbar. Die Umlenkung um 90° eines stark mit Staub und Stickoxiden beladenen Rauchgases 30 wird mittels in der 90°-Umlenkung 28 eingebauter Leitschaufeln 32 bewirkt.Figure 3 shows a schematic representation of a section of a flue gas duct 24 of an incinerator, not shown. A kink region 26 and a 90 ° deflection 28 can be seen in the flue gas duct 24. The deflection by 90 ° of a flue gas 30 heavily loaded with dust and nitrogen oxides is effected by means of guide vanes 32 installed in the 90 ° deflection 28.

Im Knickbereich 26 ist die in Figur 1 gezeigte Leitplatte 2 auf Verbindungsstücken, hier stabförmigen Sockeln 34, in den Rauchgaskanal 24 eingebaut. Gezeigt ist ein Schnitt parallel zur Querseite 4a des metallischen Rahmens 4 der Figur 1. Die Ebene 36 der Leitplatte 2 ist annähernd parallel zu der Richtung ausgerichtet, die das Rauchgas 30 in Strömungsrichtung desselben nach dem Knickbereich 26 aufweist. Ebenso ist die Ebene 36 der Leitplatte 2 angenähert in Richtung der Schwerkraft ausgerichtet, wodurch eine Ablagerung des im Rauchgas 30 befindlichen Staubes auf der Leitplatte 2 weitestgehend vermieden wird. Im Knickbereich 26 ist außerdem eine Ammoniakeindüsvorrichtung 38 eingebaut, mittels der dem Rauchgas 30 Ammoniakgas zugeführt werden kann, welcher nachfolgend in einer hier nicht weiter dargestellten DeNOx-Anlage zur katalytischen Umsetzung der Stickoxide verwendet wird. Im Bereich des Rauchgaskanals 24 vor der Leitplatte 2 mündet ein Bypasskanal 40 in den Rauchgaskanal 24. Über den Bypasskanal 40 strömt im Ausführungsbeispiel ein zuvor von dem übrigen Rauchgas 30 abgezweigter Teil 42 des Rauchgases. Der durch den Bypasskanal 40 strömende Teil 42 kann beispielsweise erheblich heißer als das in dem Rauchgaskanal 24 strömende Rauchgas 30 sein, weil dessen Wärmeinhalt zuvor in einem hier nicht weiter dargestellten Abhitzekessel zur Dampferzeugung genutzt worden ist.In the kink region 26, the guide plate 2 shown in FIG. 1 is installed in the flue gas duct 24 on connecting pieces, here rod-shaped bases 34. A section parallel to the transverse side 4a of the metallic frame 4 of FIG. 1 is shown. The plane 36 of the guide plate 2 is oriented approximately parallel to the direction which the flue gas 30 has in the flow direction thereof after the kink region 26. Likewise, the plane 36 of the guide plate 2 is approximately aligned in the direction of gravity, as a result of which the dust located in the flue gas 30 is largely avoided on the guide plate 2. In the kink area 26, an ammonia injection device 38 is also installed, by means of which ammonia gas can be supplied to the flue gas 30, which is subsequently used in a DeNO x system (not shown further here) for the catalytic conversion of the nitrogen oxides. In the area of the flue gas duct 24 in front of the guide plate 2, a bypass duct 40 opens into the flue gas duct 24. In the exemplary embodiment, a part 42 of the flue gas that has previously branched off from the rest of the flue gas 30 flows through the bypass duct 40. The part 42 flowing through the bypass duct 40 can, for example, be considerably hotter than the flue gas 30 flowing in the flue gas duct 24, because its heat content has previously been used in a waste heat boiler (not shown here) to generate steam.

Beim Betrieb der hier nicht weiter dargestellten Verbrennungsanlage erfüllt die im Knickbereich 26 eingebaute Leitplatte 2 drei Funktionen gleichzeitig. Erstens bewirkt die Leitplatte 2 entsprechend der Ausrichtung ihrer Leitfahnen 10a - 10e eine Umlenkung des Rauchgases 30 in die Strömungsrichtung des Rauchgases 30 nach dem Knickbereich 26. Zweitens wird dabei das mittels der Leitfahnen 10a - 10e abgelenkte Rauchgas um die Ränder der Leitfahnen 10a - 10e auf turbulente Strömungsbahnen umgelenkt, wodurch eine Vermischung des heißen Teils 42 mit dem übrigen Rauchgas 30 erreicht wird. Drittens sorgen die mittels der Leitplatte 2 induzierten turbulenten Strömungen dafür, daß das unmittelbar im Knickbereich 26 eingedüste Ammoniakgas homogen mit dem Rauchgas 30 vermischt wird.When operating the incineration plant, which is not shown here, the guide plate 2 installed in the kink area 26 fulfills three functions simultaneously. First, the guide plate 2 effects a deflection of the flue gas 30 in the flow direction of the flue gas 30 after the kink region 26 in accordance with the orientation of its guide vanes 10a-10e. Secondly, the flue gas deflected by the guide vanes 10a-10e is raised around the edges of the guide vanes 10a-10e deflected turbulent flow paths, whereby mixing of the hot part 42 with the remaining flue gas 30 is achieved. Third, the turbulent flows induced by means of the guide plate 2 ensure that the ammonia gas injected directly into the kink region 26 is mixed homogeneously with the flue gas 30.

Der Druckabfall, der durch die im Winkel zur Hauptströmungsrichtung aufgestellte Leitplatte 2 verursacht wird, beträgt nur etwa 1,0 mbar. Dieser geringe Druckabfall ist deshalb so niedrig, weil im Ausführungsbeispiel nur fünf Leitfahnen 10a bis 10e nahezu parallel zur Strömungsrichtung des Rauchgases 30 nach dem Knickbereich 26 aufgestellt sind. Im allgemeinen ist eine Anzahl von 4 - 10 Leitfahnen pro Leitplatte 2 sinnvoll. Mit einer solchen Aufteilung ergibt sich, wie schon dargestellt, der vernachlässigbare Druckabfall sowie eine hinreichend gute Vermischung und Umlenkung des Rauchgases 30 im Bereich nach der Knickstelle 26.The pressure drop caused by the guide plate 2 set up at an angle to the main flow direction is only approximately 1.0 mbar. This low pressure drop is so low because, in the exemplary embodiment, only five guide vanes 10a to 10e are set up almost parallel to the flow direction of the flue gas 30 after the kink region 26. In general, a number of 4 - 10 guide vanes per guide plate 2 is useful. Such a division results, as already shown, in the negligible pressure drop as well as a sufficiently good mixing and deflection of the flue gas 30 in the area after the kink 26.

Ähnlich wie die in Figur 1 dargestellte Leitplatte 2 hätte auch die in Figur 2 dargestellte Leitanordnung 14 an dieser Stelle in den Strömungskanal 24 eingebaut werden können. Hierzu ist eine Befestigung der Tragrohre 18 direkt an den Innenwänden des Rauchgaskanals 24 denkbar. Ebenso gut können die Tragrohre 18 auch auf den in Figur 3 gezeigten Sockeln 34 befestigt sein. Die Form der Leitfahnen 10a bis 10e, 16a bis 16e kann auch rechteckig, dreieckig, halbkreisförmig oder halbelliptisch sein.Similar to the guide plate 2 shown in FIG. 1, the guide arrangement 14 shown in FIG. 2 could have been installed at this point in the flow channel 24. For this purpose, attachment of the support tubes 18 directly to the inner walls of the flue gas duct 24 is conceivable. The support tubes 18 can also be attached to the bases 34 shown in FIG. 3 just as well. The shape of the guide vanes 10a to 10e, 16a to 16e can also be rectangular, triangular, semi-circular or semi-elliptical.

Claims (9)

Kombinierte Misch- und Umlenkeinrichtung für ein Strömungsmedium (30) mit einer Leitanordnung (2, 14) zur Ablenkung des Strömungsmediums (30) aus einer Hauptströmungsrichtung, wobei die Leitanordnung (2, 14) in einem Knickbereich (26) in einem Strömungskanal (24) angeordnet ist, die Ebene (36) der Leitanordnung (2, 14) annähernd parallel zu der Richtung, die der Strömungskanal (24) in Strömungsrichtung des Strömungsmediums (30) nach dem Knickbereich (26) hat, ausgerichtet ist und die Leitanordnung (2, 14) über den Querschnitt des Strömungskanals (24) gleichmäßig verteilte Durchbrüche (12) aufweist.Combined mixing and deflection device for a flow medium (30) with a guide arrangement (2, 14) for deflecting the flow medium (30) from a main flow direction, the guide arrangement (2, 14) in a bend region (26) in a flow channel (24) is arranged, the plane (36) of the guide arrangement (2, 14) is aligned approximately parallel to the direction which the flow channel (24) has in the flow direction of the flow medium (30) after the kink region (26), and the guide arrangement (2, 14) has openings (12) which are uniformly distributed over the cross section of the flow channel (24). Kombinierte Misch- und Umlenkeinrichtung nach Anspruch 1,
dadurch gekennzeichnet, daß das Versperrungsverhältnis etwa 0,35 bis 0,65 beträgt, wobei das Versperrungsverhältnis als das Verhältnis der Fläche der Durchbrüche (12) zur Gesamtfläche der Leitanordnung (2, 14) definiert ist.
Combined mixing and deflecting device according to claim 1,
characterized in that the blocking ratio is approximately 0.35 to 0.65, the blocking ratio being defined as the ratio of the area of the openings (12) to the total area of the guide arrangement (2, 14).
Kombinierte Misch- und Umlenkeinrichtung nach Anspruch 2,
dadurch gekennzeichnet, daß das Versperrungsverhältnis etwa 0,5 beträgt.
Combined mixing and deflecting device according to claim 2,
characterized in that the blocking ratio is about 0.5.
Kombinierte Misch- und Umlenkeinrichtung nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, daß die Leitanordnung (2, 14) mehrere gleichmäßig beabstandete, im wesentlichen in einer Ebene (36) liegende Leitfahnen (10a bis 10e, 16a bis 16e) umfaßt.
Combined mixing and deflecting device according to one of Claims 1 to 3,
characterized in that the guide arrangement (2, 14) comprises a plurality of equally spaced guide vanes (10a to 10e, 16a to 16e) lying essentially in one plane (36).
Kombinierte Misch- und Umlenkeinrichtung nach Anspruch 4,
dadurch gekennzeichnet, daß die Leitfahnen (10a - 10e, 16a - 16e) trapezförmig und abwechselnd mit der schmalen und der breiten Kante zur Strömung (30) des Strömungsmediums ausgerichtet sind.
Combined mixing and deflecting device according to claim 4,
characterized in that the guide vanes (10a - 10e, 16a - 16e) are aligned trapezoidally and alternately with the narrow and the wide edge to the flow (30) of the flow medium.
Kombinierte Misch- und Umlenkeinrichtung nach Anspruch 4
oder 5, dadurch gekennzeichnet, daß im Strömungskanal (24) vier bis zehn Leitfahnen (10a bis 10e, 16a bis 16e) angeordnet sind.
Combined mixing and deflecting device according to claim 4
or 5, characterized in that four to ten guide vanes (10a to 10e, 16a to 16e) are arranged in the flow channel (24).
Kombinierte Misch- und Umlenkeinrichtung nach einem der Ansprüche 1 bis 6, gekennzeichnet durch eine Orientierung, bei der die Ebene (36) der Leitanordnung (2, 14) angenähert in Richtung der Schwerkraft ausgerichtet ist.Combined mixing and deflecting device according to one of Claims 1 to 6, characterized by an orientation in which the plane (36) of the guide arrangement (2, 14) is aligned approximately in the direction of gravity. Kombinierte Leit- und Umlenkeinrichtung nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet, daß in Strömungsrichtung des Strömungsmediums (30) hinter der Leitanordnung (2, 14) eine Zugabestelle (38) für ein weiteres Strömungsmedium, wie z.B. Ammoniak NH₃, vorgesehen ist.
Combined guiding and deflecting device according to one of Claims 1 to 7,
characterized in that an addition point (38) for a further flow medium, such as ammonia NH₃, is provided behind the guide arrangement (2, 14) in the direction of flow of the flow medium (30).
Kombinierte Misch- und Umlenkeinrichtung nach einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet, daß in Strömungsrichtung des Strömungsmediums (30) vor der Leitanordnung (2, 14) ein heißerer Teil (42) des Strömungsmediums (30) mit einem kälteren Teil des Strömungsmediums (30) zusammengeführt ist.
Combined mixing and deflecting device according to one of claims 1 to 8,
characterized in that a hotter part (42) of the flow medium (30) is brought together with a colder part of the flow medium (30) in the flow direction of the flow medium (30) in front of the guide arrangement (2, 14).
EP94110282A 1993-07-14 1994-07-01 Combined mixing and direction-changing device Expired - Lifetime EP0634207B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4323541 1993-07-14
DE4323541A DE4323541A1 (en) 1993-07-14 1993-07-14 Combined mixing and deflection device

Publications (2)

Publication Number Publication Date
EP0634207A1 true EP0634207A1 (en) 1995-01-18
EP0634207B1 EP0634207B1 (en) 1996-10-16

Family

ID=6492766

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94110282A Expired - Lifetime EP0634207B1 (en) 1993-07-14 1994-07-01 Combined mixing and direction-changing device

Country Status (4)

Country Link
US (1) US6086241A (en)
EP (1) EP0634207B1 (en)
CA (1) CA2127818A1 (en)
DE (2) DE4323541A1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19929765A1 (en) * 1999-06-29 2001-01-11 Siemens Ag Flue gas cleaning device
US7056478B1 (en) 2002-11-26 2006-06-06 Alstom Technology Ltd Emission treatment system
US7118721B2 (en) * 2002-11-26 2006-10-10 Alstom Technology Ltd Method for treating emissions
US8939638B2 (en) 2008-04-21 2015-01-27 Tenneco Automotive Operating Company Inc. Method for mixing an exhaust gas flow
US9095827B2 (en) 2008-04-21 2015-08-04 Tenneco Automotive Operating Company Inc. Exhaust gas flow mixer
US8272777B2 (en) * 2008-04-21 2012-09-25 Heinrich Gillet Gmbh (Tenneco) Method for mixing an exhaust gas flow
US11040319B2 (en) * 2014-01-07 2021-06-22 Harry Glass Vortex mixing baffle
US9718037B2 (en) * 2014-12-17 2017-08-01 Caterpillar Inc. Mixing system for aftertreatment system
US9534525B2 (en) 2015-05-27 2017-01-03 Tenneco Automotive Operating Company Inc. Mixer assembly for exhaust aftertreatment system
WO2018232486A1 (en) * 2017-06-22 2018-12-27 Kelvin Thermal Energy, Inc. Stabilized thermal energy output system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2075258A (en) * 1933-07-01 1937-03-30 American Blower Corp Gas mixing apparatus
SU1011213A1 (en) * 1981-11-04 1983-04-15 Предприятие П/Я В-8808 Apparatus for preparing gaseous calibrated mixtures
DE3723618C1 (en) * 1987-07-17 1988-12-01 Steinmueller Gmbh L & C Apparatus for mixing two gases
WO1989000076A1 (en) * 1987-06-29 1989-01-12 Moore Barrett And Redwood Limited Static mixer for flowing materials

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US385992A (en) * 1888-07-10 Albert t
US2645463A (en) * 1949-02-11 1953-07-14 Standard Oil Dev Co Method and apparatus for continuous flow mixing
US2747974A (en) * 1953-08-18 1956-05-29 Olin Mathieson Mixer
SE309645B (en) * 1963-06-17 1969-03-31 Svenska Maskinverken Ab
GB1305403A (en) * 1970-01-20 1973-01-31
DE2130826A1 (en) * 1971-06-22 1973-01-11 Metallgesellschaft Ag DEVICE FOR REDUCING AND EQUALIZATION
AT314983B (en) * 1971-07-14 1974-05-10 Klein Suction elbow for centrifugal pumps
DE3043239C2 (en) * 1980-11-15 1985-11-28 Balcke-Dürr AG, 4030 Ratingen Method and device for mixing at least two fluid partial flows
US4786185A (en) * 1988-02-29 1988-11-22 Phillips Petroleum Company Apparatus and method for affecting the flow paths of fluid flowing in a pipe
US4981368A (en) * 1988-07-27 1991-01-01 Vortab Corporation Static fluid flow mixing method
DE4123161A1 (en) * 1991-07-12 1993-01-14 Siemens Ag STATIC MIXER
US5362150A (en) * 1992-12-08 1994-11-08 Hughes Aircraft Company Fluid mixer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2075258A (en) * 1933-07-01 1937-03-30 American Blower Corp Gas mixing apparatus
SU1011213A1 (en) * 1981-11-04 1983-04-15 Предприятие П/Я В-8808 Apparatus for preparing gaseous calibrated mixtures
WO1989000076A1 (en) * 1987-06-29 1989-01-12 Moore Barrett And Redwood Limited Static mixer for flowing materials
DE3723618C1 (en) * 1987-07-17 1988-12-01 Steinmueller Gmbh L & C Apparatus for mixing two gases

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SOVIET INVENTIONS ILLUSTRATED Section Ch Week 8408, 4 April 1984 Derwent World Patents Index; Class J02, AN 84-047245 *

Also Published As

Publication number Publication date
US6086241A (en) 2000-07-11
EP0634207B1 (en) 1996-10-16
DE4323541A1 (en) 1995-01-19
DE59400846D1 (en) 1996-11-21
CA2127818A1 (en) 1995-01-15

Similar Documents

Publication Publication Date Title
EP0594657B1 (en) Static mixer
EP0526393B1 (en) mixing-in device
EP0526392B1 (en) Mixing-in device for small amounts of fluid
DE2635360C2 (en) Damping device for a liquid flow
EP0261544B1 (en) Nuclear reactor fuel element
EP1166861B1 (en) Mixer for mixing at least two gas streams or other Newtonian liquids
EP0634207B1 (en) Combined mixing and direction-changing device
DE2755914A1 (en) HOLDING GRID FOR CORE FUEL ELEMENTS
EP0751820B1 (en) Combined feed and mixing installation
WO2005098870A1 (en) Fuel element for a pressurized water reactor
WO1992022071A1 (en) Fuel element with a grid structure between the rods
EP1540662B1 (en) Spacer
DE2345287B2 (en) SUPPORT FOR THE HOUSING OF A HEAT EXCHANGER, PREFERABLY A STEAM GENERATOR
DE69833416T2 (en) incinerator
DE29615575U1 (en) Fuel element with debris filter
DE3329849C2 (en)
DE19916893C1 (en) Distance spacer for a nuclear reactor fuel element has protrusions each forming a long extended spring contact region axially along the fuel rod
EP0185219A1 (en) Nuclear-reactor fuel element
DE3528499C1 (en) Heat exchanger device with heat exchanger tubes and sheet-shaped fins
EP0697913B1 (en) Plate-type catalytic converter
EP0750318B1 (en) Spacer grid for nuclear reactor fuel assembly and fuel assembly with such a spacer grid
EP0415877B1 (en) Steam generator with furnace
DE1639031C (en) Fuel element arrangement for a nuclear reactor
DE4316131A1 (en) Plate catalyst
DE4316132A1 (en) Plate catalyst

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE GB IT

17P Request for examination filed

Effective date: 19950207

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

17Q First examination report despatched

Effective date: 19960325

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE GB IT

REF Corresponds to:

Ref document number: 59400846

Country of ref document: DE

Date of ref document: 19961121

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19961129

ITF It: translation for a ep patent filed

Owner name: STUDIO JAUMANN

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20030618

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20030930

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040701

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050201

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20040701

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050701