WO2019004926A1 - Dispositif de séparation continue de particules à partir d'un liquide - Google Patents

Dispositif de séparation continue de particules à partir d'un liquide Download PDF

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Publication number
WO2019004926A1
WO2019004926A1 PCT/SE2018/050722 SE2018050722W WO2019004926A1 WO 2019004926 A1 WO2019004926 A1 WO 2019004926A1 SE 2018050722 W SE2018050722 W SE 2018050722W WO 2019004926 A1 WO2019004926 A1 WO 2019004926A1
Authority
WO
WIPO (PCT)
Prior art keywords
cyclone
liquid
cyclone tube
flow
outlet pipe
Prior art date
Application number
PCT/SE2018/050722
Other languages
English (en)
Inventor
Ingvar HÄLLGREN
Original Assignee
Alfa Laval Corporate Ab
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 Alfa Laval Corporate Ab filed Critical Alfa Laval Corporate Ab
Publication of WO2019004926A1 publication Critical patent/WO2019004926A1/fr

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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
    • B04C5/02—Construction of inlets by which the vortex flow is generated, e.g. tangential admission, the fluid flow being forced to follow a downward path by spirally wound bulkheads, or with slightly downwardly-directed tangential admission
    • B04C5/04—Tangential inlets
    • 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
    • B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
    • 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
    • B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
    • B04C5/181—Bulkheads or central bodies in the discharge opening
    • 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
    • B04C5/20—Apparatus in which the axial direction of the vortex is reversed with heating or cooling, e.g. quenching, means
    • 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
    • B04C5/22—Apparatus in which the axial direction of the vortex is reversed with cleaning means
    • 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
    • B04C7/00—Apparatus not provided for in group B04C1/00, B04C3/00, or B04C5/00; Multiple arrangements not provided for in one of the groups B04C1/00, B04C3/00, or B04C5/00; Combinations of apparatus covered by two or more of the groups B04C1/00, B04C3/00, or B04C5/00

Definitions

  • the invention relates to a device for continuous separation of particles from a liquid of lower density than the particles.
  • liquid cyclone Compared to a gas cyclone, a liquid cyclone is more difficult to dimension and has also a very limited separation ability, in part because a high density difference between liquid and particles is required, and in part because the liquid, through its high viscosity, gives a low falling speed for the particles towards the cyclone wall.
  • liquid cyclones have found their niche as thickener of a particle-filled liquid and then often in multiple stages, as well as a pre-separator to protect sensitive process equipment from harmful heavy particles, such as gravel.
  • Traditional liquid cyclones have a tangential inlet at one end and are basically of two types, those that thicken a flow with large sludge content along a tapered tube with central sludge outlet, while the partially purified liquid exits at the opposite end where the inlet is located, and the conical or straight cyclones, which accumulate separated sludge in a collecting chamber underneath, i.e. in the opposite end relative to the inlet and the outlet for the unpurified and purified liquid, respectively.
  • the disadvantage of the first type is that the ability to concentrate is low and the length tends to be impractically long, and that in the case of a high choking of the sludge outlet, or at increased flow, the efficiency is reduced due to the fact that an inlet for unpurified liquid and outlet for purified liquid are short-circuited, i.e. the flow goes the shortest way to the outlet.
  • the present invention partially solves the above related problems of the prior art liquid cyclones by having the features specified in claim 1.
  • Figure 1 is a sectional view and in Figure 2 a top view, and in Figure 3 a 3D view in a slightly different embodiment.
  • the present invention is basically a liquid cyclone without a conical bottom part, provided with a so-called boundary layer diversion (or rather boundary layer suction) of the particles separated against the cyclone wall in the boundary layer, including a smaller partial flow of liquid.
  • the main flow of particles enters the cyclone through a tangential inlet, in its upper part, whose cross sectional area and the flow that the flow-driving pump
  • the centrifugal force on a particle is proportional to the square of the tangential flow rate at the point at which it is located, divided by the radius at this point.
  • the downwardly directed vortex finally turns against a vortex reflector, or against a bottom if a vortex reflector is missing, and proceeds out of the cyclone through an upwardly directed central outlet pipe.
  • the particles separated against the cyclone tube, together with a partial flow, can continuously leave the separation process in different ways by means of boundary layer suction.
  • the most effective way is to place a vortex reflector above a collection chamber at the bottom of the cyclone. Between the vortex reflector and the inner wall of the cyclone tube, there is one or more slots through which the trapped particles are sucked down to the collecting chamber. Depending on the width of the slot, a more or less weak swirl is also obtained in the collecting chamber, which prevents the particles from sticking to the wall, while preventing them from leaving the wall on their way toward the sludge outlet.
  • the sludge outlet in its simplest form can be a suction pipe in the wall of the collection chamber, or in its bottom, preferably tangentially oriented.
  • the collection chamber can be made funnel-shaped toward the suction pipe, or provided with appropriate flow conductors to deliver the particles to the suction pipe.
  • Other manners, or complementary, for boundary layer suction is to suck in one or more slots in the cyclone tube above the vortex reflector, and / or down in the collecting chamber wall. In some situations, it is also possible to omit a vortex reflector and let the vortex turn against the bottom, which is more brutal and also results in a poorer result.
  • Departing sludge flow should be less than 10% of the main flow and so high that the boundary layer suction becomes effective in relation to the application area, thickening or protection of processing equipment downstream.
  • the cyclone efficiency can be increased by installing a vortex accelerator below the inlet, where the flow is led between curved guiding vanes which reduces the flow area and increases the tangential velocity of the swirl, while ensuring a laminar flow.
  • this arrangement results in a higher pressure drop.
  • the geometry of the cyclone is chosen so that the time to fall, for the smallest particle to capture, from a worst position close to the outlet pipe to the inner wall of the cyclone is shorter than the liquid's residence time in the downward vortex.
  • An approximate measure of residence time is obtained if the rotating amount of liquid (liters) is divided by the flow (liters / sec). Liquid below the vortex reflector is not considered to rotate in this regard.
  • An embodiment of the invention is made up of a cyclone tube 1, which is coupled at 2 with a particle chamber 3.
  • a vortex reflector 4 can be installed consisting of a disc that is centered to form one or more circumferential slots 5 for passage into the particle collecting chamber 3 of particles trapped in the boundary layer.
  • a vortex accelerator 6 can be mounted whose outer radius is the same as the inner radius of the cyclone tube 1.
  • An outlet pipe 7 is in this case extending through the vortex accelerator 6 and further extends past one or more tangential inlet tubes 8 to finally pass out of the cyclone tube through its top at the position 11.
  • the inlet pipe(s) 8 force(s) the liquid with particles to rotate with the tangential velocity given by its area and the flow that the flow-driving pump delivers. Since the density of the particles is higher than that of the liquid, they accumulate on the inner surface of the cyclone tube 1, due to the centrifugal force, in its path down toward the vortex reflector 4. The liquid continues to swirl down toward the vortex reflector 4, forming a stagnation point 9, which forces it to turn, partly because of the actual stop and partly because the only way out is through the outlet pipe 7.
  • the relatively large distance between the separated particles in the boundary layer along the inside of the cyclone tube 1 and the phenomenon at the stagnation point 9, where liquid suddenly accelerates in the opposite direction, allows the particles in the boundary layer to be very effectively sucked into the particulate chamber 3.
  • the vortex accelerator 6 consists of, for example, two vanes 10 that revolve at least 180 degrees each, seen from above, or three vanes that revolve at least 120 degrees each, or four vanes, etc.
  • the flow area between all vanes 10, as well as the flow determines the instantaneous velocity the liquid and particles obtain as they have just left the vortex accelerator 6.
  • the cyclone tube can be cooled, for example by means of a refrigerant circulating in a double jacket 12, whereby the particles in the process liquid through thermophoresis are influenced by an additional driving force directed towards the inner wall of the chilled cyclone tube (1), while stabilizing the liquid in the boundary layer because of its slightly increased density, as well as an increased viscosity.

Landscapes

  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Fluid Mechanics (AREA)
  • Cyclones (AREA)

Abstract

La présente invention concerne un cyclone liquide efficace pour la séparation de particules à partir d'un liquide. Un hydrocyclone conventionnel ayant une partie inférieure conique présente, entre autres, un problème de gestion efficace de débits variables, et le type avec une chambre de collecte inférieure présente des problèmes de drainage à des charges de particules élevées et un écoulement continu. L'invention résout ce problème au moyen d'un cyclone liquide avec un tube de cyclone cylindrique (1), dans un mode de réalisation préféré, dans le fond pourvu d'un disque formant un réflecteur de tourbillon (4) avec des fentes périphériques (5) jusqu'à une chambre de collecte (3). Les particules séparées dans la couche limite contre le tube de cyclone (1) sont aspirées à travers les fentes (5) et quittent le processus de séparation dans un écoulement partiel, à travers une ou plusieurs ouvertures d'aspiration (16) dans le côté d'une chambre de collecte et/ou dans son fond. Une aspiration de couche limite supplémentaire peut être fournie dans la partie inférieure du tube de cyclone (1) au-dessus du réflecteur de vortex (4). L'invention est adaptée pour nettoyer un liquide d'épurateur de la suie et de particules lourdes et dures similaires.
PCT/SE2018/050722 2017-06-30 2018-07-02 Dispositif de séparation continue de particules à partir d'un liquide WO2019004926A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SESE1700137-1 2017-06-30
SE1700137A SE541832C2 (sv) 2017-06-30 2017-06-30 Anordning för att kontinuerligt avskilja partiklar från en vätska

Publications (1)

Publication Number Publication Date
WO2019004926A1 true WO2019004926A1 (fr) 2019-01-03

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Family Applications (1)

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PCT/SE2018/050722 WO2019004926A1 (fr) 2017-06-30 2018-07-02 Dispositif de séparation continue de particules à partir d'un liquide

Country Status (2)

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SE (1) SE541832C2 (fr)
WO (1) WO2019004926A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115213674A (zh) * 2022-08-30 2022-10-21 中国航发湖南动力机械研究所 一种燃烧室拆装工装及使用方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9114607U1 (de) * 1991-11-23 1992-02-20 Häberle, Wilhelm, 7486 Scheer Abscheidewirbelrohr
US20040256312A1 (en) * 2001-11-27 2004-12-23 Gomez Rodolfo Antonio M Advanced liquid vortex separation system
US8182684B1 (en) * 2011-03-28 2012-05-22 Tamkang University Department of Chemical and Materials Engineering Hydrocyclone separator
US20130199137A1 (en) * 2011-10-06 2013-08-08 Husqvarna Ab Dust collector with a constant suction force
WO2016195602A1 (fr) * 2015-06-02 2016-12-08 Yoavaphankul Metha Séparateur hydrocyclone à flux axial à étages multiples

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9114607U1 (de) * 1991-11-23 1992-02-20 Häberle, Wilhelm, 7486 Scheer Abscheidewirbelrohr
US20040256312A1 (en) * 2001-11-27 2004-12-23 Gomez Rodolfo Antonio M Advanced liquid vortex separation system
US8182684B1 (en) * 2011-03-28 2012-05-22 Tamkang University Department of Chemical and Materials Engineering Hydrocyclone separator
US20130199137A1 (en) * 2011-10-06 2013-08-08 Husqvarna Ab Dust collector with a constant suction force
WO2016195602A1 (fr) * 2015-06-02 2016-12-08 Yoavaphankul Metha Séparateur hydrocyclone à flux axial à étages multiples

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115213674A (zh) * 2022-08-30 2022-10-21 中国航发湖南动力机械研究所 一种燃烧室拆装工装及使用方法
CN115213674B (zh) * 2022-08-30 2024-04-30 中国航发湖南动力机械研究所 一种燃烧室拆装工装及使用方法

Also Published As

Publication number Publication date
SE1700137A1 (sv) 2018-12-31
SE541832C2 (sv) 2019-12-27

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