EP0037347B1 - Procédé et dispositif pour la séparation de particules dans un fluide, notamment pour l'épuration de suspensions papetières - Google Patents

Procédé et dispositif pour la séparation de particules dans un fluide, notamment pour l'épuration de suspensions papetières Download PDF

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Publication number
EP0037347B1
EP0037347B1 EP81420035A EP81420035A EP0037347B1 EP 0037347 B1 EP0037347 B1 EP 0037347B1 EP 81420035 A EP81420035 A EP 81420035A EP 81420035 A EP81420035 A EP 81420035A EP 0037347 B1 EP0037347 B1 EP 0037347B1
Authority
EP
European Patent Office
Prior art keywords
suspension
chamber
longitudinal axis
zone
periphery
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
Application number
EP81420035A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0037347A1 (fr
Inventor
François Julien Saint Amand
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.)
Centre Technique Industriel dit "CENTRE TECHNIQUE DE L'INDUSTRIE DES PAPIERS CARTONS ET CELLULOSES"
Original Assignee
Centre Technique Industriel dit "CENTRE TECHNIQUE DE L'INDUSTRIE DES PAPIERS CARTONS ET CELLULOSES"
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 Centre Technique Industriel dit "CENTRE TECHNIQUE DE L'INDUSTRIE DES PAPIERS CARTONS ET CELLULOSES" filed Critical Centre Technique Industriel dit "CENTRE TECHNIQUE DE L'INDUSTRIE DES PAPIERS CARTONS ET CELLULOSES"
Priority to AT81420035T priority Critical patent/ATE6598T1/de
Publication of EP0037347A1 publication Critical patent/EP0037347A1/fr
Application granted granted Critical
Publication of EP0037347B1 publication Critical patent/EP0037347B1/fr
Expired 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
    • B04B—CENTRIFUGES
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/02—Continuous feeding or discharging; Control arrangements therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • 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
    • B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
    • 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
    • B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
    • B04C2009/005—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks with external rotors, e.g. impeller, ventilator, fan, blower, pump

Definitions

  • the invention relates to a method for the separation of particles in a fluid; it also relates to an improved device for the separation of such particles, solid, liquid or gaseous.
  • the invention is particularly, but not limited to, suitable for the paper industry, in particular for the purification of particulate suspensions, such as for example fibrous suspensions formed from recovered paper, pulps to be purified, machine effluents to which fibers and / or fillers, waste water, etc. are to be recovered separately
  • particulate suspensions such as for example fibrous suspensions formed from recovered paper, pulps to be purified, machine effluents to which fibers and / or fillers, waste water, etc. are to be recovered separately
  • the invention will be more particularly described, in its application to the paper industry, it is understood that this preferred form of implementation is only given by way of illustration. In fact, the invention can find other applications in classification or fractionation techniques by centrifugation, in the recovery of immiscible liquids of different density, from mixtures, etc. Similarly, if the fluid is most generally liquid, such as in particular water, it can also be gaseous.
  • the operation of purifying the suspensions consists in separating from said suspensions one or more fractions of undesirable particles, then, in particular in stationery, collecting a suspension of fibers free of contaminants harmful to their future reuse.
  • the suspended particle is lighter than the carrier fluid, the effect of the radial pressure gradient is greater than that of the centrifugal force and thus, the light particle is directed towards the longitudinal axis of the vortex.
  • the particle is denser than the carrier fluid, the effect of the radial gradient is less than that of the centrifugal force and the dense particle is then placed on the periphery of the vortex.
  • hydrocyclones or “centricleaners” have thus been proposed, which are constituted by a fixed conical enclosure.
  • the suspension to be purified is introduced tangentially at the head of the conical enclosure and the heaviest particles are removed at the opposite end, the suspension thus purified being then collected at the head of the enclosure in the vicinity of the longitudinal axis.
  • This device is generally effective for the separation of heavy particles (sand, metallic particles, etc.), but gives poor results with regard to the separation of light particles, in particular those whose density is close to that of the carrier fluid. .
  • the high speeds maintain a very high level of turbulence in the suspension which counteracts the separation effect between the different particles.
  • the invention overcomes the drawbacks of these different types of known purifiers. It relates to a method and a device for the purification of particulate suspensions based on the effect of a free vortex on a rotating wall, but in which a minimum state of agitation is maintained in the entire peripheral zone of the vortex, which allows to effectively separate and continuously extract different fractions of the treated suspension. In particular in the stationery sector, this type of device makes it possible to obtain fibrous suspensions practically free of contaminants.
  • the value of the oblique angle of introduction of the suspension into the enclosure is fixed by the ratio of the modules of the axial speed, a function of the flow rate and of the speed relative to the wall, determined as a function of the degree agitation desired.
  • the "radial migration speed of the particles" with respect to the fluid is essentially a function of the shape, the dimensions, the density of said particles, and the characteristics of the flow itself. This speed is lower when the density difference between the particle and the carrier fluid is lower, the dimensions of the particles are smaller and their shape is more unfavorable for their migration.
  • an auxiliary fluid is also introduced along the walls of the enclosure, which makes it possible to dilute the suspension in this area and to increase the mobility of the particles therein.
  • this ring of auxiliary fluid reduces the distance that the light particles of the suspension entering the device must travel to reach their elimination zone located towards the axis of the vortex.
  • the assembly located on the side of the supply means acts as a pump, while the means located opposite act as a turbine.
  • the mobile means for outputting the fluid can be extended at the level of the bearings by means, such as a pump, integral with said mobile means, for the particular purpose of supplying the downstream circuit.
  • Fiugres 8 and 9 represent two improved devices for the purification of large quantities of suspension.
  • the axis of rotation 2 is horizontal, it can also be vertical.
  • the bearings 6 and 7 can be positioned elsewhere, for example, on the enclosure itself, or even replaced by equivalent means, such as treads possibly mounted on tires.
  • the concentric movable supply conduits 10 and 11 deflect the incoming suspension current from the axis 2 towards the periphery and comprise a plurality of channels inclined relative to a plane passing through the axis, so as to favor the setting in motion swirling of the incoming suspension and the auxiliary fluid and allowing the angular speed to be adjusted using only the variations in the inlet flow rate of the suspension and the auxiliary fluid respectively.
  • the movable outlet conduits 12 and 13 are constituted in a similar manner to the conduits 10 and 11, but bring the outgoing suspension from the periphery towards the axis 2. This structural symmetry between the inlet section and the outlet section promotes the recovery at the outlet of the rotary enclosure of most of the kinetic energy of rotation supplied to the fluid in the inlet section.
  • the enclosure of revolution 1 is cylindrical.
  • the paper suspension to be purified containing a mixture of fibers and light contaminants is introduced into the interior of the device, via the conduit 10, in the peripheral zone of the vortex.
  • the suspension By flowing in inclined channels, not shown, formed inside the supply duct 10, the suspension is driven in a swirling rotational movement whose angular speed has been set at a value greater than the angular speed of the wall by inclination of said channels relative to a plane passing through the axis of rotation 2.
  • the suspension flow conditions are then of the "free vortex" type, as used in cyclone devices; however, maintaining a minimum degree of agitation at the periphery over the entire length of the vortex makes it possible to reduce friction to the level strictly necessary for the free mobility of the particles in the suspension.
  • the gaseous particles of this suspension gather in the axial zone 20 of the vortex where they form a gaseous core, generally in depression.
  • Such a simple device with a cylindrical or slightly convergent wall is particularly suitable for the extraction of light components from fibrous suspensions, such as pulp.
  • this dissociation of the fibrous network can be accentuated by diluting the suspension to be purified in contact with the wall by means of an auxiliary fluid introduced by the external supply duct 11 with a flow rate adjustable at will.
  • outlet end of the enclosure of revolution comprises three concentric conduits 12, 13 and 17.
  • a fiber suspension containing light components is introduced at 10 and at 11 the auxiliary fluid (water).
  • the light components are extracted at 16.
  • a fraction of the purified suspension enriched in long fibers is collected in 12, in 17 "fines” (fragments of fibers and particles of small size) and in 13 the intermediate fraction.
  • This embodiment is particularly suitable for the fractionation of paper fiber suspensions.
  • means 19 for introducing an auxiliary fluid intended to wash the heavy contaminants before their extraction.
  • the light contaminants are collected at 16, at 13 a completely purified suspension, at 12 a fraction of the suspension still containing some heavy contaminants and at 17 a fraction of the suspension still containing some light contaminants.
  • the fractions collected in 12 and 17 can possibly be recycled to perfect the purification.
  • FIGS. 6a and 6b illustrate another embodiment in which the general diverging conical shape of the assembly is given by a succession of elementary cylindrical sections 23 of increasing diameters with inlet of water or auxiliary fluid at 9.
  • Such an apparatus is particularly suitable for the purification of a suspension containing very finely divided contaminants, the speed of migration of which is practically negligible with respect to that of the other components of the suspension.
  • the suspension to be purified is introduced at 8, preferably in concentrated form, and at 9 the auxiliary fluid.
  • the mobile means corresponding to the outputs 14, 24, 25 and 26 are each extended by a pump 22, which makes it possible to supply the downstream circuit and the recycling circuits with the desired pressure.
  • the fluid curtain formed along the wall acts as a selective screen which lets heavy particles (fibers, for example) migrate towards the periphery, while it screens very fine particles.
  • Such a device is particularly advantageous for effecting the removal of the ink in the de-inking processes for old paper.
  • sections 23 would be slightly, either convergent or divergent, depending on the conditions of use envisaged (divergent sections favoring in particular the elimination of the heaviest particles, convergent sections increasing the speeds fluid rotation).
  • FIG. 7 represents the rotating part of an experimental apparatus (rotation speed 27 revolutions / second) produced in accordance with the invention and in which the enclosure 1 has a length about 0.75 m and an internal diameter of 0.245 m. This enclosure has a slightly conical wall (3.5% taper).
  • Such a device which is a little more difficult to machine than a device with a cylindrical enclosure, is particularly suitable for preventing clogging and promoting the elimination of light components.
  • a paper suspension to be purified, containing fibers and light contaminants, is introduced in 10 and in water (in water from the plant recycling) is introduced in 11.
  • the purified suspension is collected in 14, in an incompletely purified and more diluted fraction which can be recycled in 8 or 9, in 16 the light contaminants free of fibers, possibly in 17 a suspension containing the finest elements.
  • the elimination rate of a conventional commercial hydrocyclone with a fixed wall, called “Triclean" of 0.1 meters in diameter constructed by the company BIRD 96 Co Inc., for a passage is approximately 30 % of particles 0.0005 meters in diameter, density 0.98, for a flow rate of 0.0025 m 3 per second of paper pulp having a concentration of 7.5 kilograms per m 3 .
  • the elimination rate will be in a single pass of 97% for a flow rate of 0.005 m 3 per second and the fiber losses will be ten times lower (fiber losses reduced from around 1.5% to around 0.15%).
  • the suspension (water-petroleum) to be purified is introduced at 9.
  • the purified fraction (water) is collected at 14, at 15 an incompletely purified fraction which is recycled to 8, and at 16 the light fraction (petroleum).
  • FIG. 9 represents a purifier also with a conical enclosure sand sealing ring for large flows, particularly suitable for the purification of diluted suspensions, such as, for example, a very little concentrated paper pulp and containing light contaminants.
  • the air core is regulated in depression in the same way as previously through the conduit 32.
  • a more advantageous mode of use exertion adapted to the purification of concentrated suspensions consists in introducing the suspension to be purified on the side of the top of the vortex, said vortex then being formed mainly by the auxiliary fluid; especially in the case of recycling, by the recycled suspension, introduced in 10 and 11.
  • the initially concentrated suspension is thus introduced via a conduit 17 into the central region of the vortex, at the start of the axial return movement, amplified by a sufficient extraction flow from the conduit 16.
  • This arrangement which practically does not modify the structure of the flow since the flow introduced at 17 is low compared to the total flow passing through the apparatus, makes it possible to increase the radial distance to be traveled by the heavy components and thereby improves selectivity for these heavy components.
  • This operating mode can be adopted for all the embodiments of the device, comprising an outlet for heavy contaminants. It implies, as the only construction modification, the reversal of the direction of the oblique canals in 17.

Landscapes

  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Cyclones (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Centrifugal Separators (AREA)
  • Lubricants (AREA)
  • Paper (AREA)
  • Treatment Of Liquids With Adsorbents In General (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
EP81420035A 1980-03-21 1981-03-13 Procédé et dispositif pour la séparation de particules dans un fluide, notamment pour l'épuration de suspensions papetières Expired EP0037347B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81420035T ATE6598T1 (de) 1980-03-21 1981-03-13 Verfahren und vorrichtung zur abscheidung von partikeln in einem fluidum, insbesondere zur reinigung von suspensionen in der papierindustrie.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8007244A FR2478489B1 (fr) 1980-03-21 1980-03-21 Procede et dispositif pour la separation de particules dans un fluide, notamment pour l'epuration de suspensions papetieres
FR8007244 1980-03-21

Publications (2)

Publication Number Publication Date
EP0037347A1 EP0037347A1 (fr) 1981-10-07
EP0037347B1 true EP0037347B1 (fr) 1984-03-14

Family

ID=9240352

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81420035A Expired EP0037347B1 (fr) 1980-03-21 1981-03-13 Procédé et dispositif pour la séparation de particules dans un fluide, notamment pour l'épuration de suspensions papetières

Country Status (11)

Country Link
US (1) US4443331A (sv)
EP (1) EP0037347B1 (sv)
JP (1) JPS56163767A (sv)
AT (1) ATE6598T1 (sv)
BR (1) BR8101386A (sv)
CA (1) CA1153989A (sv)
DE (1) DE3162573D1 (sv)
ES (1) ES8206220A1 (sv)
FI (1) FI72760C (sv)
FR (1) FR2478489B1 (sv)
NO (1) NO155380C (sv)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4533468A (en) * 1982-12-06 1985-08-06 The Broken Hill Proprietary Company Limited Centrifugal separation method and apparatus
FR2592324B1 (fr) * 1986-01-02 1988-03-18 Total Petroles Separateur tournant a vortex pour liquide heterogene.
JPS6416385U (sv) * 1987-07-17 1989-01-26
FR2636251B1 (fr) * 1988-09-13 1992-01-17 Lamort E Dispositif pour la separation de particules dans un liquide, notamment pour l'epuration de suspensions papetieres
FI82495C (sv) * 1989-06-08 1991-03-11 Ahlstroem Oy Förfarande och anordning för separering av tunga föroreningar från fib ersuspensioner i samband med pumpning
DE4105903C2 (de) * 1991-02-26 1994-10-06 Escher Wyss Gmbh Vollmantelzentrifuge als Reiniger für Stoffsuspensionen
FI90358C (sv) * 1992-05-19 1994-01-25 Pom Technology Oy Ab Förfarande och anordning för sortering av en fibersuspension
FR2703602B1 (fr) * 1993-04-06 1995-06-09 Callec Paul Procede de separation de produits particulaires de densites differentes en suspension dans un fluide et dispositif pour sa mise en oeuvre.
FI97332B (sv) * 1993-12-23 1996-08-30 Pom Technology Oy Ab Anordning och förfarande för att pumpa och avskilja en blandning av gas och vätska samt användning därav i en pappersmaskin
DE9415521U1 (de) * 1994-09-24 1995-02-02 Gall, Holger, 21629 Neu Wulmstorf Vorrichtung zur mechanischen Gewinnung von pflanzlichem Öl
US5542542A (en) * 1994-12-07 1996-08-06 Pulp And Paper Research Institute Of Canada System for detecting contaminants
FR2771029B1 (fr) 1997-11-18 2000-01-28 Total Sa Dispositif pour la separation des constituants d'un melange heterogene
US6767461B1 (en) 1999-03-24 2004-07-27 Environmental Separation Technologies Pty Ltd Separator
PT102320A (pt) * 1999-06-09 2000-12-29 Finidro Financiamento Energeti Processo e aparelho para a preparacao de pasta de papel a partir de aparas de papel
EP1069234B1 (de) * 1999-07-06 2004-05-26 Voith Paper Patent GmbH Verfahren und Vorrichtung zum Ausbringen von Störstoffen aus einem Hydrozyklon
FR2856317B1 (fr) * 2003-06-20 2006-10-13 Perche Activites Dispositif et procede pour separer les phases solides et huileuses d'une matieres oleagineuse, notamment d'une pate de karite
AU2008241422B2 (en) * 2007-04-18 2012-05-03 Thomas A. Valerio Method and system for sorting and processing recycled materials
FR2919206B1 (fr) * 2007-07-27 2009-10-16 Total Sa Separateur a ecoulement cyclonique
US11319218B2 (en) * 2009-06-22 2022-05-03 Verno Holdings, Llc System for decontaminating water and generating water vapor
US11407655B2 (en) 2009-06-22 2022-08-09 Verno Holdings, Llc System for decontaminating water and generating water vapor
FR2954187B1 (fr) * 2009-12-18 2014-08-01 Total Sa Separateur a ecoulement cyclonique.
FR2972365B1 (fr) * 2011-03-07 2015-04-24 Total Sa Separateur a ecoulement cyclonique.
WO2022010629A1 (en) * 2020-07-07 2022-01-13 Verno Holdings, Llc System for decontaminating water and generating water vapor

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR889192A (sv) * 1944-01-03
US1712184A (en) * 1926-10-07 1929-05-07 Reinhold M Wendel Centrifugal concentrator
CH253544A (it) * 1943-09-03 1948-03-15 Crosti Piero Macchina centrifugatrice di fluidi a flusso continuo.
US2864499A (en) * 1951-09-21 1958-12-16 Skb Schuechtermann & Kremer Ba Heavy media centrifugal separating apparatus and method
US2796808A (en) * 1955-12-06 1957-06-25 Vickerys Ltd Vortex separators
US3010579A (en) * 1959-08-17 1961-11-28 Duesling Clarence Lehi Mineral desliming concentrating and separating apparatus
US2967618A (en) * 1960-03-28 1961-01-10 Vane Zdenek Vortical separator
GB1058914A (en) * 1965-06-14 1967-02-15 Outokumpu Oy Froth flotation apparatus
US3399773A (en) * 1967-04-14 1968-09-03 Read Ivan Jay Apparatus for separating solids from liquids
US3616992A (en) * 1969-06-06 1971-11-02 James S Deacon Partial vacuum centrifugal separator
US3648840A (en) * 1969-08-01 1972-03-14 Roy A Bobo Rotating cyclone centrifuge
US3642129A (en) * 1969-09-19 1972-02-15 Southwest Resources Inc Apparatus and method for continuously separating solid particles in a fluid medium
FR2080117A5 (en) * 1970-02-24 1971-11-12 Pennwalt France Centrifugal separator - esp for milk
CA949941A (en) * 1970-05-08 1974-06-25 Queen's University At Kingston Vortex clarifier
AU465775B2 (en) * 1971-12-15 1975-10-09 Bobo Roya. Rotating cyclone centrifuge
BE794399A (fr) * 1972-01-28 1973-07-23 Walmsleys Bury Ltd Unite de separation
US3928186A (en) * 1973-07-24 1975-12-23 Boise Cascade Corp Combined pulp cleaning system including high and low pressure drop hydrocyclone cleaners
CH568446A5 (sv) * 1973-08-27 1975-10-31 Escher Wyss Gmbh
FR2293983A1 (fr) * 1974-12-09 1976-07-09 Univ Kingston Appareil separateur a tourbillon
GB1476670A (en) * 1974-12-10 1977-06-16 Univ Kingston Vortex clarifier
US4178234A (en) * 1978-07-20 1979-12-11 Bobo Roy A Rotating cyclone centrifuge apparatus

Also Published As

Publication number Publication date
FR2478489B1 (fr) 1985-08-30
BR8101386A (pt) 1981-09-29
JPS56163767A (en) 1981-12-16
US4443331A (en) 1984-04-17
FI72760B (fi) 1987-03-31
CA1153989A (fr) 1983-09-20
NO810940L (no) 1981-09-22
DE3162573D1 (en) 1984-04-19
FI810839L (fi) 1981-09-22
JPS6137989B2 (sv) 1986-08-27
ES500516A0 (es) 1982-08-16
FI72760C (sv) 1987-07-10
NO155380B (no) 1986-12-15
FR2478489A1 (fr) 1981-09-25
ATE6598T1 (de) 1984-03-15
NO155380C (no) 1987-03-25
EP0037347A1 (fr) 1981-10-07
ES8206220A1 (es) 1982-08-16

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