EP3524357A1 - Dispositif separateur - Google Patents

Dispositif separateur Download PDF

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Publication number
EP3524357A1
EP3524357A1 EP18155889.1A EP18155889A EP3524357A1 EP 3524357 A1 EP3524357 A1 EP 3524357A1 EP 18155889 A EP18155889 A EP 18155889A EP 3524357 A1 EP3524357 A1 EP 3524357A1
Authority
EP
European Patent Office
Prior art keywords
separation
secondary separator
inlet
dip tube
hydrocyclone
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.)
Pending
Application number
EP18155889.1A
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German (de)
English (en)
Inventor
Michael KRAXNER
Thomas SENFTER
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.)
MCI Management Center Innsbruck - Internationale Hochschule GmbH
Original Assignee
MCI Management Center Innsbruck - Internationale Hochschule 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 MCI Management Center Innsbruck - Internationale Hochschule GmbH filed Critical MCI Management Center Innsbruck - Internationale Hochschule GmbH
Priority to EP18155889.1A priority Critical patent/EP3524357A1/fr
Publication of EP3524357A1 publication Critical patent/EP3524357A1/fr
Pending legal-status Critical Current

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    • 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
    • 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
    • B04C3/00—Apparatus in which the axial direction of the vortex flow following a screw-thread type line remains unchanged ; Devices in which one of the two discharge ducts returns centrally through the vortex chamber, a reverse-flow vortex being prevented by bulkheads in the central discharge duct
    • B04C3/06—Construction of inlets or outlets to 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

Definitions

  • the invention relates to a device for separating solid particles from a suspension or for concentration of densely divergent substances in a suspension comprising a hydrocyclone with at least one feed for the raw liquid, a cylindrical segment, a conical segment, at least one overflow nozzle and at least one underflow nozzle ( discharge). Furthermore, the invention relates to a method for the separation of solid particles from the underflow stream of a hydrocyclone or for the concentration of densely divergent substances in a suspension.
  • hydrocyclones For the separation or classification of solid particles contained in suspensions, for concentration and for the separation of emulsions such as oil-water mixtures often hydrocyclones are used.
  • This separation method is based on the interaction of mass-dependent centrifugal and flow forces.
  • the raw liquid flowing tangentially into the cylindrical part of the hydrocyclone is forced onto a circular path, with mass denser solid particles being conveyed to the outer wall of the hydrocyclone and to the discharge direction.
  • a tapering of the cylinder (cone) leads to a displacement of the less mass-dense liquid in particular, resulting in an inner, upwardly directed vortex.
  • the loss of liquid poses no problem, since only an enrichment of the solid particles in the underflow is required.
  • the enrichment is determined by the design and the operation of the hydrocyclone. Difficult to influence are the properties of the concentrated suspension, which, however, should be designed selectively in many technical applications. In other applications, the loss of liquid effluent from the underflow stream should be minimized as much as possible. For example, in waterjet cutting, the separation of solid particles without loss of water is required for the jet.
  • the underflow stream can be fed to downstream separation processes.
  • a hydrocyclone is followed by another hydrocyclone.
  • the underflow stream coming from the first hydrocyclone is in turn passed tangentially into the second hydrocyclone, the centrifugal force being used again for separation.
  • the US 3928186 A describes the sequential deposition of light paper fibers from a paper waste suspension. In this case, instead of the underflow stream of a hydrocyclone, the overflow stream and thus particle-poor liquid are fed to a second separation process.
  • the object of the present invention is to separate separated particles located in the underflow (discharge), which have been concentrated by a hydrocyclone in the discharge, from the underflow. Furthermore, the composition of the concentrated suspension can be selectively influenced.
  • a device for separating solid particles from suspensions comprising a hydrocyclone with at least a) a hydrocyclone feed for raw liquid, b) a cylindrical segment, c) a conical segment, d) an overflow nozzle and e) an underflow nozzle, characterized by a secondary separator, comprising a secondary separator inlet, a separation chamber and a dip tube, wherein the underflow nozzle is fluidly connected to a secondary separator inlet, wherein at least one lateral separation wall with the separation lid and a separation bottom delimits the separation space, wherein a dip tube into the separation chamber protrudes and acts as a spout for a secondary current.
  • a secondary separator characterized by a secondary separator inlet, a separation chamber and a dip tube, wherein the underflow nozzle is fluidly connected to a secondary separator inlet, wherein at least one lateral segregation wall with the separation cover and a separation bottom delimits the separation space, a dip tube protruding into the separation space and acting as outlet for a secondary flow.
  • a secondary separator is connected downstream of the hydrocyclone.
  • the hydrocyclone has at least one hydrocyclone inlet for the raw liquid, at least one segment in the form of a straight circular cylinder jacket and a conical segment, at least one overflow nozzle and at least one underflow nozzle.
  • the underflow nozzle is fluidly connected to a secondary separator inlet, wherein the underflow stream flows through a secondary separator inlet into the secondary separator.
  • the secondary separator according to the invention is characterized by a separation chamber, wherein at least one lateral separation wall with the separation lid and a separation bottom delimits the separation space, a dip tube protruding into the separation space and functioning as outlet for a secondary flow.
  • the secondary separator preferably has a circular hollow cylindrical shape, but the shape is not limited to a circular hollow cylinder.
  • a secondary separator according to the invention may also have the shape of a general cylinder or a conical shape and also be spherical.
  • the lateral separation wall forms the lateral surface and is preferably made of aluminum, steel or plastic.
  • the separating lid closes the secondary separator at the top in a substantially fluid-tight manner, an opening being provided for an inlet.
  • the Abscheidedeckel can be permanently connected to the lateral Abscheidewand, as well as it can be made removable.
  • the separation bottom closes the secondary separator downwards in a substantially fluid-tight manner, whereby an opening for the immersion tube is preferably provided.
  • the separation bottom like the cover, can be permanently connected to the lateral separation wall, as well as being removable.
  • the secondary separator according to the invention makes use of the angular momentum of the underflow stream coming from the hydrocyclone.
  • An optional fluid diffuser in the area of the secondary separator inlet can additionally strengthen the swirl.
  • the centrifugal force acting on the particles is used for solid-liquid separation.
  • no additional external electrical or mechanical energy is needed for this separation process.
  • the dip tube is arranged such that the underflow nozzle facing the opening of the dip tube and the opening of the underflow nozzle are arranged substantially concentric.
  • the dip tube is preferably continuously straight but not necessarily running continuously straight and can only be performed piecewise straight.
  • the dip tube may have a bend or bent in one embodiment.
  • the dip tube can be displaceable relative to the separation chamber in the direction of separation bottom and / or separation cover.
  • a particular embodiment provides for a dip tube with a diving tube cover, wherein this is provided at the underflow nozzle facing the dip tube fluid-permeable.
  • the diving tube cover can for example be flat, conical or curved.
  • a bent or bent immersion tube makes it possible for a secondary flow to be guided laterally out of the separation space through the lateral surface or out of the separation space obliquely through the separation bottom.
  • particles can be removed from the separation chamber as a particle stream by periodic or continuous actuation of a valve in the axial flow direction.
  • the axial displacement of the dip tube and its geometric proportions (diameter, length, shape, mounting position) allows optimization of the secondary flow in terms of volume flow, continuity, selectivity and separation efficiency.
  • a diving tube cover prevents the direct entry of particles into the dip tube and brings additional advantages in terms of purity and suspension properties of the secondary stream.
  • the separation bottom is preferably flat. In a special design, this has a converging in the direction Abscheidedeckel and from the lateral separation wall to the dip tube towards cone. Alternatively, it is conceivable that the separation bottom has a cone which extends in the direction of the deposition cover and from the dip tube to the lateral separation wall.
  • a conical design of the separation bottom can have advantageous effect in terms of separation efficiency.
  • the flow behavior of the secondary flow is positively influenced.
  • the separation bottom has a depression in each region of the transition to the lateral separation wall, the depression functioning as a trough or as a discharge trough.
  • the recess is designed annular.
  • a special design provides a removable part of the separation bottom in the area of the tub in order to remove dirt manually.
  • At least one rinsing inlet and at least one rinsing outlet are provided, wherein these are connected in a fluid-conducting manner to the secondary separator.
  • the at least one flushing inlet and the at least one flushing sequence can be arranged substantially tangentially to the lateral separation wall and orthogonal to the longitudinal axis of the secondary separator inlet.
  • the at least one flushing inlet and the at least one flushing outlet can be arranged substantially parallel to the secondary separator inlet, wherein the at least one flushing inlet is connected to the separating lid and the at least one flushing outlet is connected to the separating plate.
  • Such a flushing unit has the advantage that the manual cleaning of a person maintaining a device according to the invention can be largely removed.
  • the object of the separation of solid particles from the underflow stream of a hydrocyclone or the concentration of a suspension is achieved by a method in which a raw liquid flows as an inlet stream into a hydrocyclone, wherein at least a first solid-liquid separation takes place in the hydrocyclone, wherein an overflow stream and an underflow stream from the hydrocyclone flows.
  • the method is also characterized in that the underflow stream flows into a secondary separator according to the invention, wherein in the secondary separator at least a second solid-liquid separation or concentration takes place and a secondary stream flows from at least one secondary separator.
  • One variant of the method provides for recirculating the secondary flow coming from the secondary separator into the at least one hydrocyclone inlet.
  • the secondary stream can be returned to the overflow stream, for example continuously, discontinuously or after any number of deposition cycles.
  • the recycling of the secondary stream into the at least one hydrocyclone feed has the advantage that the total separation efficiency or selectivity can be increased. Thereby the purity or composition of the secondary flow can be controlled according to the requirements.
  • a flow sensor can be provided, whereby the mass flow or volume flow of the secondary flow can be measured in a special process variant.
  • the measurement result of the flow sensor thereby provides a variable for controlling a valve or a pump.
  • the flow conditions in the secondary separator can thereby be dynamically adapted in order to positively influence the separation efficiency or selectivity as required.
  • Regardless of the embodiment is taken to ensure that separated particles are removed from the separation chamber as a particle stream or concentrated suspension. This can be done periodically or continuously. In general, different process variants can be combined with each other.
  • An essential object of the invention is to provide an apparatus and method for the effective separation of solid particles from the underflow stream 5 of a hydrocyclone 10 to minimize the loss of liquid. Another objective is the selective concentration of a suspension emerging from the underflow of a hydrocyclone.
  • a secondary separator 20 according to the invention has a special geometry for optimum operation. Without restricting the design to it, in the following preferred embodiments according to Fig. 1 to 11 described.
  • Fig. 1 shows a secondary separator 20 according to the invention, wherein this is a hydrocyclone 10 directly downstream.
  • the raw liquid in the form of a suspension flows through a hydrocyclone inlet 11 tangentially into an upper, cylindrical segment 14 'of the hydrocyclone 10.
  • the raw liquid is thereby forced onto a circular path and there is subsequently a downwardly directed vortex.
  • An axial taper of the cylindrical segment 14 ' forms a conical segment 14. This causes bulk denser solid particles to be promoted to the wall of the conical segment 14, thereby driving low-particle liquid into the center of the hydrocyclone.
  • the lower mass density of the particle-poorer liquid leads to an upward flow and consequently to the outflow of a part of the particle-poor liquid through an overflow nozzle 12 as overflow stream 2 (FIG. Fig. 2 ).
  • Particles, residual liquid or concentrated suspension leave the hydrocyclone 10 as underflow stream 3 (FIG. Fig. 2 ) via the underflow nozzle 13 and flows into a secondary separator 20 according to the invention, wherein the underflow nozzle 13 is correspondingly fluid-conductively connected to a secondary separator inlet 21.
  • the secondary separator inlet 21 is preferably a tube with a circular cross-section.
  • the dimensioning can be adjusted depending on the volume flow and viscosity of the raw fluid.
  • the twist can be additionally reinforced.
  • the secondary separator inlet 21 is connected to a separating lid 22, for example by welding, gluing or screwing. Via the inlet 21 passes the still present as a suspension underflow stream 3 ( Fig. 2 ) in a separation chamber 24.
  • This is essentially formed by a circular cylindrical lateral surface or lateral separation wall 23, for example, aluminum, steel or plastic.
  • a variant may be designed to be transparent in at least one region of the lateral separation wall 23 and / or the deposition cover 22 and / or the deposition base 26, wherein this is intended to serve as a viewing window at least one region.
  • the Abscheidedeckel 22 and the Abscheideière 26 closes the hollow cylinder at its end faces substantially fluid-tight, wherein openings for the at least one inlet 21 and the at least one dip tube 25 are provided.
  • the tightness can be produced by a welded connection.
  • a releasable screw or clamp connection can be provided with corresponding sealing elements, whereby the Abscheidedeckel 22 and Abscheideière 26 are removable.
  • the dip tube 25 and the outlet 27 are preferably formed from the same tube. That part of the tube which extends into the separating space substantially filled with suspension is designated accordingly as dip tube 25. That part of the tube which leads away from the separation chamber 24 in the flow direction is referred to as outlet 27.
  • the tube may be formed like the tube for the secondary separator inlet 21.
  • FIG Fig. 4 A schematic representation of the flow course within a secondary separator 20 according to the invention is shown in FIG Fig. 4 shown.
  • the underflow stream 3 coming from the hydrocyclone 10 has an angular momentum which originates from the mode of operation of the hydrocyclone 10.
  • Sekundärabscheider inlet 21 mass density particles or suspension components are pressed due to the centrifugal force against the inside of the tube.
  • the centripetal force counteracting the inner side of the pipe is eliminated, as a result of which more dense particles are forced against the lateral separation wall 23 and finally come to rest on the separation bottom.
  • the less mass-dense liquid remains in the inner region of the separation chamber 24 and experiences a buoyancy.
  • the freed of solid particles liquid flows through the dip tube 25 and via the outlet 27 as a secondary flow 5 from.
  • a dip tube cover 25 ' may be provided to prevent the direct entry of a bulk dense solid particle into the dip tube 25.
  • Fig. 5 shows a particular embodiment of a secondary separator according to the invention 20.
  • the dip tube 25 in this case has a kink, so that it either penetrates the conically shaped Abscheideière 26 to one side, or above the cylindrical part of the separation wall (23) leaves.
  • the secondary flow 5 flows through the outlet 27.
  • the separated particles or the concentrated suspension can be discharged downwards.
  • the introduction of a valve into the particle stream allows the periodic or preferably continuous discharge of solid particles or concentrated suspension.
  • FIG. 6a A special design of the separation bottom is in Fig. 6a and 6b shown.
  • the conical separation bottom 28 runs together from the lower region of the lateral separation wall 23 in the direction of separation cover 22 and dip tube 25. This influences the course of the flow in the lower region of the separating chamber 24 in such a way that the buoyancy of the less dense liquid is favored.
  • Fig. 6b the variant of a conical separation bottom 28 "with opposite inclination is shown, which also allows the flow within the secondary separator 20 to be influenced positively depending on the viscosity of a suspension or a gas mixture.
  • Fig. 6c shows a special design of the Abscheidedeckels 22.
  • the secondary divider inlet 21 in the direction of lateral separation wall 23 downwardly divergent cone 29 thereby acts on the prevailing in the upper region of the separation chamber 24 flow.
  • an abrupt flow which in the case of highly viscous masses desirably leads to loosening, can be contained, in order to counteract turbulence and a concomitant reduced deposition of solid particles on the separation wall 23.
  • Such a cone 29 may be provided for any conceivable embodiment of a secondary separator 20 according to the invention.
  • Fig. 6d shows a special design of the secondary separator, wherein the separation bottom can be partially perforated, open or run completely open.
  • This embodiment has advantageous properties in terms of concentration, in particular in the case of freely discharging systems against ambient pressure.
  • the Abscheidedeckel can also diverge conically ( Fig. 6e ).
  • FIG Fig. 7 Another particular embodiment of the deposition tray 26 is shown in FIG Fig. 7 shown.
  • the design has a recess 26 'in the separation bottom in the region of the lateral separation wall.
  • the recess preferably forms an annular trough.
  • the separation bottom can be made completely removable or identify a removable element only in the region of the depression 26 '. This should facilitate cleaning.
  • the advantage of the depression 26 'per se is that solid particles deposit in this region in particular, as a result of which the formation of particle accumulations on the otherwise flat deposition soil 26 can largely be avoided or at least retarded. Such accumulations can be obstacles to the flow, in the worst case already deposited solid particles are entrained by the particle-poor liquid.
  • FIG. 8a shows tangential rinsing inlets and outlets 30, 31.
  • the rinsing feeds are preferably positioned horizontally and tangentially to the lateral separation wall 23 in the upper area of the secondary separator 20 and connected in a fluid-conducting manner to the separation space 24.
  • Two flushing inlets 30 ', 30 are preferably provided, which are parallel to each other in addition to the arrangement mentioned, that inflowing liquid flows in the same direction through both inlets on the circular path of the lateral separation wall 23.
  • the flow entrains previously separated particles, wherein the flushing liquid flows tangentially with the contaminants in the lower region via preferably two flushing outlets 31 ', 31 ".
  • These are arranged analogously to the scavenging inlets 30, but offset in the lower region of the secondary separator and according to the flow direction.
  • flushing inlets 30 ", 30" and outflows 31 ', 31 ", and three inlets or outlets, which are each offset by an angle of 120 °, or more, are conceivable
  • the flushing inlets can also be used as flushing outlets and the flushing outlets can be used as flushing inlets
  • each flushing inlet can be used as a flushing outlet, and vice versa.
  • Fig. 8b shows axially arranged flushing inlets and outlets 32, 33.
  • two feeds 32 ', 32 "" are provided, which are arranged vertically and parallel to the secondary separator inlet 21, the inlets 32 attached to the separating lid 22 and to the separating chamber 24 fluidly connected.
  • two processes are preferred 33 ', 33 "provided, which are arranged analogously to the inlets 32, but attached to the separation bottom and the separation chamber 24 are fluid-conductively connected.
  • rinsing feeds can be used as rinsing processes and the rinsing processes as rinsing feeds.
  • Fig. 9 Possible variants of a method according to the invention with regard to recycling the secondary stream are in Fig. 9 shown.
  • a feedback to influence the selectivity in the hydrocyclone inlet 11 with an inlet stream 1 Fig. 9a ).
  • the return of the secondary flow 5 can be carried out in a second inlet, which is arranged below the one hydrocyclone inlet 11. In both cases, the secondary flow 5 is returned to the separation process.
  • the secondary flow 5 can also be returned directly to the overflow stream 2 ( Fig. 9c ).
  • particles or suspension continuously for example with a in Fig. 5 illustrated design, or periodically, with a in Fig. 8 illustrated embodiment, are discharged from the secondary separator 20 according to the invention as a particle stream or suspension 4.
  • the pressure-driven operation provides ( Fig. 10a ), to influence the delivery rate of the secondary flow 5 with a pump 6.
  • a control valve 7 is provided instead of the pump 6.
  • a flow sensor 8 can be connected downstream, with its measurement result thereby providing a variable for regulating the pumping power or the position of the valve 7.
  • the return of the secondary flow into the hydrocyclone inlet ( Fig. 9a ), into a second hydrocyclone feed ( Fig. 9b ) or in the overflow stream ( Fig. 9c ).
  • the waiting times and the respective pressures of the rinsing streams can be adapted to the degree of soiling or to the nature of the solid particles.
EP18155889.1A 2018-02-08 2018-02-08 Dispositif separateur Pending EP3524357A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18155889.1A EP3524357A1 (fr) 2018-02-08 2018-02-08 Dispositif separateur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18155889.1A EP3524357A1 (fr) 2018-02-08 2018-02-08 Dispositif separateur

Publications (1)

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EP3524357A1 true EP3524357A1 (fr) 2019-08-14

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EP18155889.1A Pending EP3524357A1 (fr) 2018-02-08 2018-02-08 Dispositif separateur

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114431809A (zh) * 2020-11-05 2022-05-06 广东美的白色家电技术创新中心有限公司 一种旋流分离器

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1130339A (en) 1965-01-26 1968-10-16 Coal Industry Patents Ltd Mineral separation
US3928186A (en) 1973-07-24 1975-12-23 Boise Cascade Corp Combined pulp cleaning system including high and low pressure drop hydrocyclone cleaners
US4378289A (en) * 1981-01-07 1983-03-29 Hunter A Bruce Method and apparatus for centrifugal separation
EP0313197A2 (fr) * 1987-09-05 1989-04-26 Serck Baker Limited Séparateur
EP1133538A1 (fr) * 1998-11-06 2001-09-19 Shell Internationale Researchmaatschappij B.V. Separateur
WO2007144631A2 (fr) * 2006-06-16 2007-12-21 Cameron International Corporation Séparateur et procédé de séparation

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1130339A (en) 1965-01-26 1968-10-16 Coal Industry Patents Ltd Mineral separation
US3928186A (en) 1973-07-24 1975-12-23 Boise Cascade Corp Combined pulp cleaning system including high and low pressure drop hydrocyclone cleaners
US4378289A (en) * 1981-01-07 1983-03-29 Hunter A Bruce Method and apparatus for centrifugal separation
EP0313197A2 (fr) * 1987-09-05 1989-04-26 Serck Baker Limited Séparateur
EP1133538A1 (fr) * 1998-11-06 2001-09-19 Shell Internationale Researchmaatschappij B.V. Separateur
WO2007144631A2 (fr) * 2006-06-16 2007-12-21 Cameron International Corporation Séparateur et procédé de séparation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114431809A (zh) * 2020-11-05 2022-05-06 广东美的白色家电技术创新中心有限公司 一种旋流分离器

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