EP0649347B1 - A cyclone separator - Google Patents

A cyclone separator Download PDF

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Publication number
EP0649347B1
EP0649347B1 EP93915089A EP93915089A EP0649347B1 EP 0649347 B1 EP0649347 B1 EP 0649347B1 EP 93915089 A EP93915089 A EP 93915089A EP 93915089 A EP93915089 A EP 93915089A EP 0649347 B1 EP0649347 B1 EP 0649347B1
Authority
EP
European Patent Office
Prior art keywords
chamber
cyclone separator
angle
wide end
cyclone
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
EP93915089A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0649347A1 (en
Inventor
Karl-Erik Larsson
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.)
Cyclotech AB
Original Assignee
Cyclotech 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 Cyclotech AB filed Critical Cyclotech AB
Publication of EP0649347A1 publication Critical patent/EP0649347A1/en
Application granted granted Critical
Publication of EP0649347B1 publication Critical patent/EP0649347B1/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
    • B04C5/103—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
    • B04C5/08—Vortex chamber constructions
    • B04C5/081—Shapes or dimensions
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/18—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force
    • D21D5/24—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force in cyclones

Definitions

  • the present invention relates to a cyclone separator for separating substances from a fibre-liquid-suspension, particularly paper pulp suspensions, of the kind defined in the preamble of the following Claim 1.
  • Cyclones of the kind used in the paper industry to cleanse a paper pulp suspension from contaminants and impurities in the form of sand grains, metal particles, chips, splinters and larger companionl objects, such as paper clips and paper staples that are liable to be contained by paper pulp produced from wastepaper will typicelly comprise an elongated cyclone chamber which tapers in a direction towards one end thereof and which is provided at its wider end with a tangentially directed inlet for the suspension to be cleaned and an axially directed outlet for cleaned suspension, the accept, and which further includes an axially directed second outlet for the contaminants or impurities, i.e. the reject.
  • a cyclone separator of this kind operates in the following manner:
  • the suspension to be cleaned is fed at high speed into the chamber, through the tangentially directed inlet provided in the upper, wider part of the chamber.
  • the input suspension thereby moves helically or spirally on the inner surface of the wall of the separator, in a direction towards the opposite, narrower end of the chamber, i.e. towards the axially directed second outlet.
  • the heavier particles in the suspension i.e. the contaminants, endeavour to collect against the wall of the cyclone, while the lighter particles, i.e. the fibres, collect in the centre of the cyclone.
  • the contaminants are moved down into the tapering or narrowing part of the cyclone and exit therefrom through the axially directed second outlet.
  • the inner part of the vortex turns at the lower end of the tapering part of the cyclone and moves axially in an opposite direction, forming a helical or spiralling vortex, and leaves the cyclone through the upper end thereof in the form of a light, clean fraction called the accept.
  • the accept will essentially contain fibres of the desired nature.
  • the cyclone chamber of those cyclone separators known hitherto for cleansing paper pulp suspensions have an inner wall which is either smooth or is provided with helically extending screw grooves which facilitate movement of the coarser and heavier contaminants down towards the bottom outlet of the cyclone, as illustrated for instance in Prior Publications US-A 3,399,770, DE-C 2,285,233 and SE-C 187,435.
  • an individual particle will move in a circular path around the inner wall of the conical chamber without shifting axially.
  • the particle is held in suspension by buoyancy and entraining forces.
  • the buoyancy forces acting on the particle tend to counteract the entraining forces that endeavour to move the particle axially and thus hold the particle in suspension.
  • the particle thus continuously moves on the same level.
  • the particle is also subjected to a centrifugal force, such that the particle will be held against the inner chamber wall and move around the wall in a closed circular path.
  • the particle will cut into the surface of the inner wall as it moves therearound.
  • the effect of these particles on the inner chamber wall will gradually wear the wall to a state in which it must be repaired or replaced.
  • the present invention is intended to remove effectively primarily the kind of contaminants that are found in paper pulp which is produced, e.g., from recycled paper, such as paper clips, staples and other heavier particles.
  • the extraction, of such contaminants places completely different requirements on cyclone construction.
  • the main object of the present invention is to provide a cyclone separator which will effectively extract heavy particles from a fibre suspension.
  • Another object of the invention is to provide a cyclone separator which will have a long useful life.
  • a further object of the invention is to provide a cyclone separator which will have few operational breakdowns.
  • Still another object of the invention is to provide a cyclone separator which will achieve a fully satisfactory cleansing result.
  • Yet another object of the invention is to provide a cyclone separator which will enable both heavy reject and light reject to be separated more effectively, i.e. a separator which can be readily constructed for the extraction of heavy contaminants and for the extraction of light contaminants in manufacture.
  • Another positive effect achieved with the invention is that by increasing the angle ⁇ and the pitch S, the liquid flow inwardly of the inclined plane can be urged closer to the gas core that is generated in the centre of the chamber. This is highly beneficial when wishing to separate light particles, so-called light reject. These particles are influenced by centripetal forces and are drawn into the centre of the cyclone. The flank of the helical screw groove assists in ⁇ pushing ⁇ these light particles in towards the centre, where they are separated.
  • Figure 1 illustrates a vertically mounted inventive cyclone separator and is a sectioned view of the separator taken in a vertical plane.
  • the cyclone separator includes a main part 3 which has an inner, conical chamber 4 which includes an essentially tangential inlet at the wider end 5 of the chamber.
  • the chamber 4 tapers downwardly and its inner wall has a screw-like configuration including series of contiqous helical threads.
  • Each of these threads includes a first upper surface or flank 1 and a second lower surface or flank 2.
  • the upper surface 1 faces towards the wide end 5 of the chamber 4, and defines an angle ⁇ with a line that extends parallel with the centre line of the main cyclone part.
  • the reference sign ⁇ identifies the angle between a line that extends parallel with the centre line of the main cyclone part and a conical, inner imaginary surface A containing the intersections of the upper and lower surfaces 1, 2 of the extending helical threads.
  • the second surface or flank 2 faces away from the wide end 5, towards the narrower end 6 of the cyclone chamber and intersects with the upper surface or flank 1 of the next underlying thread at an angle ⁇ .
  • the angle ⁇ lies within the range (90°- ⁇ )-90° so that the lower thread surface 2 acts as an inclined plane to advance downwardly particles moved against the inner surface of the chamber 4 and under this lower thread surface.
  • the reference S identifies the pitch of the helical thread.
  • the pitch may vary according to requirements and the area of use.
  • the second flank 2 and its extension form a triangle together with the first flank 1 of the nearest underlying screw-thread and an inner imaginary surface containing the intersections of the upper and lower flanks or surfaces of the extending helical threads.
  • Figure 2 illustrates the different forces that are generated in an inventive cyclone separator.
  • CFN acts perpendicularly to the flank and CFu acts in a direction in which the particle is pressed up to the ⁇ ceiling ⁇ of the helical screw-thread or helix, i.e. said second flank 2.
  • HF represents the downwardly acting force of the liquid flow, this force acting from the wider end of the chamber in a direction opposite to CFu.
  • the particle is also subjected to the force of gravity G. The force of gravity, however, is negligible in this connection.
  • the particle will travel in a horizontal orbit and will sooner or later strike ⁇ the ceiling ⁇ of the helical screw-thread and accompany the screw-thread downwards, since the screw-thread has a downwardly extending helical form.
  • the heavy particules will be moved up towards the screw flank extending helically along the inner cyclone wall and slide down along the inclined surface of the helical screw-thread or helix, so as to reach ultimately the lower outlet end 7 of the cyclone, at the same time as the accept outlet 8 is located in the centre of the wider end 5 of the chamber 4.
  • This novel configuration of the cyclone wall thus functions as a latch hook which while permitting movement in one direction will block movement in the opposite direction. This is particularly important in the vicinity of the lower outlet 7, where the dimensions are small and the gas core lies close to the chamber wall.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Cyclones (AREA)
  • Paper (AREA)
EP93915089A 1992-06-30 1993-06-29 A cyclone separator Expired - Lifetime EP0649347B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9202008A SE510561C2 (sv) 1992-06-30 1992-06-30 Cyklonavskiljare
SE9202008 1992-06-30
PCT/SE1993/000592 WO1994000242A1 (en) 1992-06-30 1993-06-29 A cyclone separator

Publications (2)

Publication Number Publication Date
EP0649347A1 EP0649347A1 (en) 1995-04-26
EP0649347B1 true EP0649347B1 (en) 1998-09-30

Family

ID=20386649

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93915089A Expired - Lifetime EP0649347B1 (en) 1992-06-30 1993-06-29 A cyclone separator

Country Status (10)

Country Link
US (1) US5653347A (fi)
EP (1) EP0649347B1 (fi)
JP (1) JP2803038B2 (fi)
AU (1) AU4520193A (fi)
CA (1) CA2136983C (fi)
DE (2) DE4392971T1 (fi)
FI (1) FI110490B (fi)
GB (1) GB2282088B (fi)
SE (1) SE510561C2 (fi)
WO (1) WO1994000242A1 (fi)

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AU3195897A (en) 1996-05-24 1998-01-05 Jury Bronislavovich Ekhin Method for converting the rotation of a solid body into linear traction force according to a directional unbalance process, and devices for realising the same
US5944197A (en) * 1997-04-24 1999-08-31 Southwestern Wire Cloth, Inc. Rectangular opening woven screen mesh for filtering solid particles
WO2003012217A1 (en) * 2001-07-30 2003-02-13 Vortech-Eco Systems Limited Centripetal separator
US8075668B2 (en) 2005-03-29 2011-12-13 Dresser-Rand Company Drainage system for compressor separators
MX2009002982A (es) 2006-09-19 2009-05-25 Dresser Rand Co Sello de tambor separador rotatorio.
WO2008036394A2 (en) 2006-09-21 2008-03-27 Dresser-Rand Company Separator drum and compressor impeller assembly
BRPI0717088B1 (pt) 2006-09-25 2019-10-29 Dresser Rand Co sistema de proteção de acoplamento
BRPI0717087B1 (pt) 2006-09-25 2018-10-16 Dresser Rand Co sistema de carretel conector para conectar um primeiro componente e um segundo componente de um sistema de compressão industrial
EP2066948A4 (en) 2006-09-25 2012-01-11 Dresser Rand Co ACCESS COVER FOR PRESSURED BOND DRAWER
MX2009003178A (es) 2006-09-25 2009-04-03 Dresser Rand Co Sistema de montaje de compresor.
MX2009003179A (es) 2006-09-25 2009-04-03 Dresser Rand Co Deflector de fluidos para dispositivos separadores de fluido.
EP2415507A1 (en) 2006-09-26 2012-02-08 Dresser-Rand Company Improved static fluid separator device
SE531578C2 (sv) * 2008-01-31 2009-05-26 Glv Finance Hungary Kft Hydrocyklon
BRPI0908051A2 (pt) 2008-03-05 2015-08-11 Dresser Rand Co Conjunto compressor que inclui separador e bomba ejetora
US8245532B2 (en) 2008-05-15 2012-08-21 Concepts Eti, Inc. Semi-closed air-cycle refrigeration system and a positive-pressure snow removal cyclone separator therefor
US7931740B2 (en) * 2008-06-20 2011-04-26 The Boeing Company Cyclone separator
US8079805B2 (en) 2008-06-25 2011-12-20 Dresser-Rand Company Rotary separator and shaft coupler for compressors
US7922218B2 (en) 2008-06-25 2011-04-12 Dresser-Rand Company Shear ring casing coupler device
US8062400B2 (en) 2008-06-25 2011-11-22 Dresser-Rand Company Dual body drum for rotary separators
US8210804B2 (en) 2009-03-20 2012-07-03 Dresser-Rand Company Slidable cover for casing access port
US8087901B2 (en) 2009-03-20 2012-01-03 Dresser-Rand Company Fluid channeling device for back-to-back compressors
US8061972B2 (en) 2009-03-24 2011-11-22 Dresser-Rand Company High pressure casing access cover
EP2478229B1 (en) 2009-09-15 2020-02-26 Dresser-Rand Company Improved density-based compact separator
WO2011100158A2 (en) 2010-02-10 2011-08-18 Dresser-Rand Company Separator fluid collector and method
US8663483B2 (en) 2010-07-15 2014-03-04 Dresser-Rand Company Radial vane pack for rotary separators
US8673159B2 (en) 2010-07-15 2014-03-18 Dresser-Rand Company Enhanced in-line rotary separator
US8657935B2 (en) 2010-07-20 2014-02-25 Dresser-Rand Company Combination of expansion and cooling to enhance separation
US8821362B2 (en) 2010-07-21 2014-09-02 Dresser-Rand Company Multiple modular in-line rotary separator bundle
JP5936144B2 (ja) 2010-09-09 2016-06-15 ドレッサー ランド カンパニーＤｒｅｓｓｅｒ−Ｒａｎｄ Ｃｏｍｐａｎｙ 洗浄可能に制御された排水管
US9024493B2 (en) 2010-12-30 2015-05-05 Dresser-Rand Company Method for on-line detection of resistance-to-ground faults in active magnetic bearing systems
US8994237B2 (en) 2010-12-30 2015-03-31 Dresser-Rand Company Method for on-line detection of liquid and potential for the occurrence of resistance to ground faults in active magnetic bearing systems
WO2012138545A2 (en) 2011-04-08 2012-10-11 Dresser-Rand Company Circulating dielectric oil cooling system for canned bearings and canned electronics
US8876389B2 (en) 2011-05-27 2014-11-04 Dresser-Rand Company Segmented coast-down bearing for magnetic bearing systems
US8851756B2 (en) 2011-06-29 2014-10-07 Dresser-Rand Company Whirl inhibiting coast-down bearing for magnetic bearing systems
US8997310B2 (en) 2012-10-12 2015-04-07 Electrolux Home Care Products, Inc. Vacuum cleaner cyclone with helical cyclone expansion region

Family Cites Families (8)

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SE187435C1 (fi) * 1963-01-01
US3399770A (en) * 1966-01-19 1968-09-03 Beloit Corp Method for centrifugal separation of particles from a mixture
CA941753A (en) * 1970-09-28 1974-02-12 Elast-O-Cor Products And Engineering Limited Hydrocyclones
US4224145A (en) * 1977-12-02 1980-09-23 Cellwood Grubbens Ab Vortex cleaner
SE434709B (sv) * 1981-12-04 1984-08-13 Celleco Ab Hydrocyklonseparator for rening av massasuspension med hog ingaende fiberhalt
GB8821161D0 (en) * 1988-09-09 1988-10-12 Serck Baker Ltd Separator
GB9106574D0 (en) * 1991-03-27 1991-05-15 Bagghley Jack Improvements in or relating to material treatment apparatus
SE469511B (sv) * 1991-12-02 1993-07-19 Celleco Hedemora Ab Hydrocyklon med turbulensskapande organ

Also Published As

Publication number Publication date
GB9423243D0 (en) 1995-01-11
CA2136983C (en) 2000-02-22
DE4392971T1 (de) 1995-07-20
SE9202008D0 (sv) 1992-06-30
AU4520193A (en) 1994-01-24
EP0649347A1 (en) 1995-04-26
JP2803038B2 (ja) 1998-09-24
CA2136983A1 (en) 1994-01-06
SE9202008L (sv) 1993-12-31
FI946155A (fi) 1994-12-29
JPH07508460A (ja) 1995-09-21
GB2282088A (en) 1995-03-29
FI110490B (fi) 2003-02-14
GB2282088B (en) 1996-10-30
FI946155A0 (fi) 1994-12-29
WO1994000242A1 (en) 1994-01-06
DE4392971C2 (de) 1998-07-16
US5653347A (en) 1997-08-05
SE510561C2 (sv) 1999-06-07

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