EP0616853B1 - Hydrocyclone - Google Patents

Hydrocyclone Download PDF

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Publication number
EP0616853B1
EP0616853B1 EP94103498A EP94103498A EP0616853B1 EP 0616853 B1 EP0616853 B1 EP 0616853B1 EP 94103498 A EP94103498 A EP 94103498A EP 94103498 A EP94103498 A EP 94103498A EP 0616853 B1 EP0616853 B1 EP 0616853B1
Authority
EP
European Patent Office
Prior art keywords
immersion tube
tube
hydrocyclone
distributor
blade
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.)
Expired - Lifetime
Application number
EP94103498A
Other languages
German (de)
French (fr)
Other versions
EP0616853A1 (en
Inventor
Michael Jerabek
Wolfgang Ruf
Thomas Martin
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.)
JM Voith GmbH
Original Assignee
JM Voith 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 JM Voith GmbH filed Critical JM Voith GmbH
Publication of EP0616853A1 publication Critical patent/EP0616853A1/en
Application granted granted Critical
Publication of EP0616853B1 publication Critical patent/EP0616853B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/08—Vortex chamber constructions
    • B04C5/081—Shapes or dimensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/08—Vortex chamber constructions
    • B04C5/103—Bodies or members, e.g. bulkheads, guides, in the vortex chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/12—Construction of the overflow ducting, e.g. diffusing or spiral exits
    • B04C5/13—Construction of the overflow ducting, e.g. diffusing or spiral exits formed as a vortex finder and extending into the vortex chamber; Discharge from vortex finder otherwise than at the top of the cyclone; Devices for controlling the overflow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/24—Multiple arrangement thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/12—Construction of the overflow ducting, e.g. diffusing or spiral exits
    • B04C5/13—Construction of the overflow ducting, e.g. diffusing or spiral exits formed as a vortex finder and extending into the vortex chamber; Discharge from vortex finder otherwise than at the top of the cyclone; Devices for controlling the overflow
    • B04C2005/136—Baffles in the vortex finder

Definitions

  • the invention relates to a hydrocyclone according to the preamble of claim 1.
  • a hydrocyclone is known from US-A-3764006 and JP-A-52-149666.
  • the hydrocyclones known from US-A-3764006 and JP-A-52-149666 comprise a slim, conical main part of the cyclone body with the discharge end, a heavy fraction at the truncated cone tip and a preferably cylindrical dip tube at the other end of the cyclone for removal a light fraction.
  • the guide device for deflecting the flow within the dip tube is arranged at a minimum distance from the inlet end of the dip tube.
  • a similar device is known from AU-A-75100/74, but the guide apparatus is accommodated outside the dip tube.
  • a hydrocyclone is known from DE 1072024, in which the blades of the guide apparatus have an arcuate leading edge, the blades being simply curved plates.
  • FR-A-1483525 shows a gas exhaust pipe arranged in addition to and within the dip tube, but this arrangement does not have a guide device which is arranged at a distance from the inlet end of the dip tube.
  • the arcuate design of the leading edges of the blades should not be used.
  • other aspects have proven to be essential.
  • dip tube it is also not necessary for the dip tube to have any conical shape, but a straight dip tube is advantageous according to the invention, at least because it is easier to manufacture in terms of production technology.
  • FIG. 1 shows a first schematic sketch in axial section
  • FIG. 2 shows a similar sketch of another embodiment
  • FIG. 3 shows a detail of FIG. 1 in relation to the guide apparatus and the inlet area of the dip tube.
  • the hydrocyclone 1 is shown with a tangential inflow tube 2, the conical lower part 12, which is only indicated in broken lines here, and with a central immersion tube 3 projecting from above into the entry area of the cyclone the leading edge of the guide device 5 is arranged with the guide blades 7.
  • the distance of the guide apparatus - that is to say the leading edge of the blades 7 - from the leading edge of the dip tube 3 is at least equal to half the inner diameter of the dip tube. If, for example, the inner diameter of the immersion tube is 50 mm, the minimum distance should be set at around 25 mm. It has been found that this enables the guide apparatus to function properly because disruptive edge currents are avoided at the inlet area of the dip tube.
  • blades 7 sharpened in the entry region which blades may run with their radially inner edge, for example, following a parabolic curve - based on a branch thereof.
  • the curvature of the blades decreases from the inlet area to the outlet end of the guide apparatus, so that they finally run flat and straight, corresponding to a radial plane of the hydrocyclone drawn through them.
  • an additional gas discharge pipe 6 ' is provided centrally in and concentrically with the dip pipe 3, this time a somewhat larger distance of the guide apparatus from the inlet end of the gas pipe is chosen, which is approximately equal to the inside pipe diameter and preferably at least 170% of the inside pipe diameter is. This is approximately considered a minimum distance.
  • the leading edge of the dip tube 3 is rounded, approximately with a radius of curvature between 0.65 times and 0.9 times the wall thickness s of the dip tube 3.
  • this is also a thickening 10 , which is preferably located at least partially within the dip tube.
  • the measures described also result in the immersion tube not being too large in length because of the internals thereof, so that additional friction losses do not occur.
  • the minimum distances mentioned are indicated in the figures as I min .

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  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Cyclones (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

A wet cyclone having a slender body with a truncated cone at an end thereof includes a heavy fraction outlet at an apex of the truncated cone and an immersion tube on the other end of the body. The immersion tube is cylindrical for withdrawal of a light non-gaseous fraction. A diffuser within the immersion tube deflects the flow within the tube for recovery of pressure head. The diffuser is disposed at a distance from the inlet end of the immersion tube of at least about half the inside diameter of the immersion tube.

Description

Die Erfindung betrifft einen Hydrozyklon entsprechend dem Oberbegriff des Patentanspruchs 1. Ein solcher Hydrozyklon ist bekannt aus US-A-3764006 und JP-A-52-149666. Die aus der US-A-3764006 und der JP-A-52-149666 bekannten Hydrozyklone umfassen einen schlanken, kegelförmigen Hauptteil des Zyklonkörpers mit dem Ausstoßende fuhr eine Schwerfraktion an der Kegelstumpfspitze und mit einem vorzugsweise zylindrisch ausgebildeten Tauchrohr am anderen Ende des Zyklons zur Abfuhr einer Leichtfraktion. Der Leitapparat zur Ablenkung der Strömung innerhalb des Tauchrohres ist in einem Mindestabstand vom Eintrittsende des Tauchrohres angeordnet. Aus der AU-A-75100/74 ist eine ähnliche Vorrichtung bekannt, wobei jedoch der Leitapparat außerhalb des Tauchrohres untergebracht ist. Aus der DE 1072024 ist ein Hydrozyklon bekannt, bei dem die Schaufeln des Leitapparates eine bogenförmige Eintrittskante aufweisen, wobei die Schaufeln einfach gekrümmte Platten sind.The invention relates to a hydrocyclone according to the preamble of claim 1. Such a hydrocyclone is known from US-A-3764006 and JP-A-52-149666. The hydrocyclones known from US-A-3764006 and JP-A-52-149666 comprise a slim, conical main part of the cyclone body with the discharge end, a heavy fraction at the truncated cone tip and a preferably cylindrical dip tube at the other end of the cyclone for removal a light fraction. The guide device for deflecting the flow within the dip tube is arranged at a minimum distance from the inlet end of the dip tube. A similar device is known from AU-A-75100/74, but the guide apparatus is accommodated outside the dip tube. A hydrocyclone is known from DE 1072024, in which the blades of the guide apparatus have an arcuate leading edge, the blades being simply curved plates.

Die FR-A-1483525 zeigt ein zusätzlich zum Tauchrohr und innerhalb derselben angeordnetes Gasabzugsrohr, wobei jedoch diese Anordnung keinen Leitapparat der mit Abstand vom Eintrittsende des Tauchrohres angeordnet ist, aufweist. Erfindungsgemäß soll die bogenförmige Ausbildung der Eintrittskanten der Schaufeln wie in der DE-AS 1072024 gerade nicht verwendet werden. Für den hauptsächlich vorgesehenen Anwendungszweck bei Fasersuspensionen haben sich andere Gesichtspunkte als wesentlich herausgestellt.FR-A-1483525 shows a gas exhaust pipe arranged in addition to and within the dip tube, but this arrangement does not have a guide device which is arranged at a distance from the inlet end of the dip tube. According to the invention, the arcuate design of the leading edges of the blades, as in DE-AS 1072024, should not be used. For the main intended application in fiber suspensions, other aspects have proven to be essential.

Ferner ist es auch nicht nötig, daß das Tauchrohr eine irgendwie geartete konische Form hat, sondern ein gerades Tauchrohr ist erfindungsgemäß von Vorteil, zumindest weil es fertigungstechnisch einfacher herzustellen ist.Furthermore, it is also not necessary for the dip tube to have any conical shape, but a straight dip tube is advantageous according to the invention, at least because it is easier to manufacture in terms of production technology.

Nachfolgend wird die Erfindung der in den Figuren der Zeichnung dargestellten Ausführungsbeispiele erläutert. Dabei stellt Figur 1 eine erste schematische Skizze im Axialschnitt, Figur 2 eine ähnliche Skizze einer anderen Ausführungsform und Figur 3 eine Einzelheit von Figur 1 in Bezug auf den Leitapparat und den Eintrittsbereich des Tauchrohres dar.The invention of the exemplary embodiments illustrated in the figures of the drawing is explained below. 1 shows a first schematic sketch in axial section, FIG. 2 shows a similar sketch of another embodiment, and FIG. 3 shows a detail of FIG. 1 in relation to the guide apparatus and the inlet area of the dip tube.

In Figur 1 ist der Hydrozyklon 1 dargestellt mit tangentialem Einströmrohr 2, dem konischen Unterteil 12, das hier nur gebrochen angedeutet ist, sowie mit einem zentralen, von oben in den Eintrittsbereich des Zyklons hineinragenden Tauchrohr 3. Innerhalb des Tauchrohrs ist in einem bestimmten Abstand von dessen Eintrittskante der Leitapparat 5 mit den Leitschaufeln 7 angeordnet. Der Abstand des Leitapparats - also der Eintrittskante der Schaufeln 7 - von der Eintrittskante des Tauchrohrs 3 ist mindestens gleich dem halben Tauchrohrinnendurchmesser. Beträgt z.B. der Innendurchmesser des Tauchrohrs 50 mm, so ist der Mindestabstand mit 25 mm etwa anzusetzen. Es hat sich herausgestellt, daß auf diese Weise eine einwandfreie Wirkungsweise des Leitapparats ermöglicht wird, weil störenden Randströmungen am Eintrittsbereich des Tauchrohres ausgewichen wird. Für den vorgesehenen Zweck sollte vorzugsweise der Leitapparat entsprechend Figur 2 im Eintrittsbereich angespitzte Schaufeln 7 aufweisen, die etwa nach einer parabelförmigen Kurve - bezogen auf einen Ast derselben - mit ihrer radial inneren Kante verlaufen können. Die Krümmung der Schaufeln nimmt vom Eintrittsbereich zum Austrittsende des Leitapparats ab, so daß sie schließlich eben und gerade verlaufen, entsprechend einer durch sie gezogenen Radialebene des Hydrozyklons. Man braucht nicht sehr viele Schaufeln anzuwenden - wie es auch aus der eingangs erwähnten Schrift nach dem Stand der Technik bekannt ist - so daß etwa ein Abstand von einem Viertel des Innenumfangs des Tauchrohrs genügt. Das bedeutet natürlich, daß der Leitapparat 5 etwa vier Schaufeln 7 aufweist.In FIG. 1, the hydrocyclone 1 is shown with a tangential inflow tube 2, the conical lower part 12, which is only indicated in broken lines here, and with a central immersion tube 3 projecting from above into the entry area of the cyclone the leading edge of the guide device 5 is arranged with the guide blades 7. The distance of the guide apparatus - that is to say the leading edge of the blades 7 - from the leading edge of the dip tube 3 is at least equal to half the inner diameter of the dip tube. If, for example, the inner diameter of the immersion tube is 50 mm, the minimum distance should be set at around 25 mm. It has been found that this enables the guide apparatus to function properly because disruptive edge currents are avoided at the inlet area of the dip tube. For the intended purpose, the guide apparatus according to FIG. 2 should preferably have blades 7 sharpened in the entry region, which blades may run with their radially inner edge, for example, following a parabolic curve - based on a branch thereof. The curvature of the blades decreases from the inlet area to the outlet end of the guide apparatus, so that they finally run flat and straight, corresponding to a radial plane of the hydrocyclone drawn through them. You do not need to use very many blades - as is also known from the above-mentioned prior art - so that a distance of a quarter of the inner circumference of the dip tube is sufficient. Of course, this means that the guide device 5 has about four blades 7.

Im Fall von Figur 2 ist ein zusätzliches Gasabfuhrrohr 6' zentral im und konzentrisch zum Tauchrohr 3 vorgesehen, wobei diesmal ein etwas größerer Abstand des Leitapparats vom Eintrittsende des Gasrohres gewählt ist, der etwa gleich dem Tauchrohr-Innendurchmesser ist und vorzugsweise mindestens 170 % des Tauchrohrinnendurchmessers beträgt. Dies wird ungefähr als ein Mindestabstand angesehen.In the case of FIG. 2, an additional gas discharge pipe 6 'is provided centrally in and concentrically with the dip pipe 3, this time a somewhat larger distance of the guide apparatus from the inlet end of the gas pipe is chosen, which is approximately equal to the inside pipe diameter and preferably at least 170% of the inside pipe diameter is. This is approximately considered a minimum distance.

In Figur 3 ist erkennbar, daß die Eintrittskante des Tauchrohrs 3 abgerundet ausgeführt ist, und zwar etwa mit einem Abrundungsradius zwischen dem 0,65-fachen und dem 0,9-fachen der Wandstärke s des Tauchrohrs 3. Vorzugsweise ist dies auch eine Verdickung 10, die sich vorzugsweise mindestens zum Teil innerhalb des Tauchrohrs befindet. Hierdurch kann den Sekundärströmungen im Eintrittsbereich des Tauchrohrs in erheblichem Maße begegnet werden. Insgesamt ergibt sich mit den geschilderten Maßnahmen auch eine nicht zu große Länge des Tauchrohrs wegen der Einbauten desselben, so daß zusätzliche Reibungsverluste nicht auftreten. Die genannten Mindestabstände sind in den Figuren mit Imin angegeben.In Figure 3 it can be seen that the leading edge of the dip tube 3 is rounded, approximately with a radius of curvature between 0.65 times and 0.9 times the wall thickness s of the dip tube 3. Preferably, this is also a thickening 10 , which is preferably located at least partially within the dip tube. As a result, the secondary flows in the inlet area of the dip tube can be countered to a considerable extent. Overall, the measures described also result in the immersion tube not being too large in length because of the internals thereof, so that additional friction losses do not occur. The minimum distances mentioned are indicated in the figures as I min .

Claims (8)

  1. Hydrocyclone, preferably with a slender, conical main part of the cyclone body with the outlet end of a heavy fraction at the apex of the truncated cone and with an immersion tube at the other end of the cyclone, which preferably has a cylindrical construction, for the discharge of a light fraction, which is essentially not gas, as well as with a distributor within the immersion tube for deflecting the flow within the latter for the purpose of recovering the pressure height, the distributor (5) being located at a minimum distance from the inlet end of the immersion tube (3) of half the inner diameter of the immersion tube (3); characterised in that the hydrocyclone comprises an additional gas outlet tube (6) located concentrically with respect to the immersion tube and within the latter and the distance of the distributor (5) from the inlet opening of the gas tube (6) amounts to at least one, preferably to at least 1.7 times the inner diameter of the immersion tube.
  2. Hydrocyclone according to Claim 1, characterised in that the radial extent (blade width) of the blades (7) of the distributor (5) amounts to 15-30% and in the case of the additional central gas tube (6) between 15 and 20% of the inner diameter of the immersion tube.
  3. Hydrocyclone according to one of Claims 1 to 2, characterised by a rounding of the inlet edge of the immersion tube (3) with a radius between 0.65 times and 0.9 times the wall thickness of the immersion tube (3).
  4. Hydrocyclone according to one of Claims 1 to 3, characterised by a peripheral, rounded thickening (10) at the inlet edge of the immersion tube (3).
  5. Hydrocyclone according to Claim 4, characterised in that the thickening (10) is located at least partly inside the immersion tube (3).
  6. Hydrocyclone according to one of Claims 1 to 5, characterised by a narrowing-down of the blade (7) reducing the blade width at the beginning (inlet end) of the blade (7) to a width of 0 over a length of the latter of up to 20% of the inner diameter of the immersion tube.
  7. Hydrocyclone according to Claim 6, characterised in that the narrowing-down takes place in the form of a branch or a section of the branch of a parabola or hyperbola.
  8. Hydrocyclone according to one of Claims 1 to 7, characterised in that the distributor comprises blades (7) having a simple curvature for the smooth impingement of the flow at the beginning (inlet region of the distributor 5) with a curvature or inclination decreasing in the downstream direction towards the radial planes of the cyclone passing through the blades, the curvature decreasing to a straight extent of the blade (7) at its outlet end and they lie with their outlet end in a corresponding radial plane of the hydrocyclone.
EP94103498A 1993-03-26 1994-03-08 Hydrocyclone Expired - Lifetime EP0616853B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4309920A DE4309920A1 (en) 1993-03-26 1993-03-26 Hydro-cyclone separator with central outlet tube for lighter fraction - which has internal guide vanes at a distance from end equal to half diameter of tube.
DE4309920 1993-03-26

Publications (2)

Publication Number Publication Date
EP0616853A1 EP0616853A1 (en) 1994-09-28
EP0616853B1 true EP0616853B1 (en) 1997-10-22

Family

ID=6483970

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94103498A Expired - Lifetime EP0616853B1 (en) 1993-03-26 1994-03-08 Hydrocyclone

Country Status (9)

Country Link
US (1) US5466372A (en)
EP (1) EP0616853B1 (en)
JP (1) JPH07864A (en)
KR (1) KR940021128A (en)
AT (1) ATE159434T1 (en)
BR (1) BR9400884A (en)
DE (2) DE4309920A1 (en)
FI (1) FI941416A (en)
TW (1) TW285646B (en)

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DE4309920A1 (en) * 1993-03-26 1993-08-26 Voith Gmbh J M Hydro-cyclone separator with central outlet tube for lighter fraction - which has internal guide vanes at a distance from end equal to half diameter of tube.
GB2354724B (en) * 1997-03-24 2001-09-05 Vision Almet Ltd Moisture separator for digester gases and landfill gases and raw natural gases
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US6500345B2 (en) 2000-07-31 2002-12-31 Maritime Solutions, Inc. Apparatus and method for treating water
US6599422B2 (en) 2001-06-20 2003-07-29 Maritime Solutions Technology, Inc. Separator for liquids containing impurities
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JP2006055622A (en) * 2004-08-23 2006-03-02 Samsung Kwangju Electronics Co Ltd Cyclone dust collector and vacuum cleaner having the same
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US20070235090A1 (en) * 2006-04-10 2007-10-11 David Thompson Fluid processing system
FR2908673B1 (en) * 2006-11-20 2009-11-06 Fcb Ciment Sa APPARATUS FOR SELECTING GRANULOMETRIC AND / OR DRYING MATERIAL.
DE102009016045A1 (en) 2009-04-02 2010-10-07 Linde Aktiengesellschaft Flux guiding device for immersion pipe of cyclone filter, has multiple flux guiding blades which have flat upper section that lies in longitudinal section plane of immersion pipe
AT512151B1 (en) * 2012-05-24 2013-06-15 A Tec Holding Gmbh Device for separating substances from a medium
CN102886316B (en) * 2012-09-18 2014-07-02 东北石油大学 Hydrocyclone used for three-phase medium separation
CN103752426B (en) * 2014-01-22 2016-11-09 太原理工大学 Cyclone on-line control device based on overflow pipe
US9700186B2 (en) 2014-01-30 2017-07-11 Vista Outdoor Operations Llc Portable vacuuming device for collecting and neutralizing flammable residue
EP3184178B1 (en) * 2015-12-23 2018-10-17 J. Wagner AG Powder coating equipment for coating workpieces
WO2019146100A1 (en) * 2018-01-29 2019-08-01 三菱電機株式会社 Oil separator, compressor and refrigeration cycle device
CN113182086B (en) * 2021-05-19 2023-02-07 重庆工商大学 Emulsion breaking and dewatering separation method for emulsion
WO2024013885A1 (en) * 2022-07-13 2024-01-18 三菱電機株式会社 Foreign matter removal device

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Also Published As

Publication number Publication date
BR9400884A (en) 1994-11-08
TW285646B (en) 1996-09-11
DE4309920A1 (en) 1993-08-26
ATE159434T1 (en) 1997-11-15
FI941416A0 (en) 1994-03-25
JPH07864A (en) 1995-01-06
EP0616853A1 (en) 1994-09-28
DE59404379D1 (en) 1997-11-27
KR940021128A (en) 1994-10-17
US5466372A (en) 1995-11-14
FI941416A (en) 1994-09-27

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