EP0359682B1 - Dispositif pour la séparation sélective de particules dans un liquide, notamment pour l'épuration de suspensions fibreuses papetières - Google Patents

Dispositif pour la séparation sélective de particules dans un liquide, notamment pour l'épuration de suspensions fibreuses papetières Download PDF

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Publication number
EP0359682B1
EP0359682B1 EP89420338A EP89420338A EP0359682B1 EP 0359682 B1 EP0359682 B1 EP 0359682B1 EP 89420338 A EP89420338 A EP 89420338A EP 89420338 A EP89420338 A EP 89420338A EP 0359682 B1 EP0359682 B1 EP 0359682B1
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EP
European Patent Office
Prior art keywords
chamber
suspension
rotation
central body
revolution
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
EP89420338A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0359682A1 (fr
Inventor
Alain Serres
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 DE L'INDUSTRIE DES PAPIERS CARTONS ET CELLULOSE
Kadant Lamort SAS
Original Assignee
CENTRE TECHNIQUE DE L'INDUSTRIE DES PAPIERS CARTONS ET CELLULOSE
E&M Lamort Fils SA
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 DE L'INDUSTRIE DES PAPIERS CARTONS ET CELLULOSE, E&M Lamort Fils SA filed Critical CENTRE TECHNIQUE DE L'INDUSTRIE DES PAPIERS CARTONS ET CELLULOSE
Priority to AT89420338T priority Critical patent/ATE78533T1/de
Publication of EP0359682A1 publication Critical patent/EP0359682A1/fr
Application granted granted Critical
Publication of EP0359682B1 publication Critical patent/EP0359682B1/fr
Anticipated expiration legal-status Critical
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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
    • 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
    • D21D5/22—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force in apparatus with a vertical axis

Definitions

  • the invention relates to a device for the selective separation of particles in a liquid, in particular in a suspension.
  • the invention is particularly suitable for the paper industry, in particular for the purification of particulate suspensions, such as for example fibrous suspensions.
  • the invention may however find other applications in classification or fractionation techniques by centrifugation, in the recovery of immiscible liquids of different densities, etc.
  • This device gives excellent results in terms of efficiency, rejection rate and energy consumption, in particular for productions of less than about three hundred cubic meters per hour in diluted paste (concentration of the order from 1 %).
  • concentration of the order from 1 %) concentration of the order from 1 %.
  • Document US-A-2,748,668 describes an apparatus intended for purifying paper pulp comprising a fixed external enclosure, in which a rotary central body with fins is disposed. This device is mainly intended to purify heavy contaminants. In this way, the dough is collected in the center with the light fraction. The general divergent shape of the central body prevents the exit of the light components which then accumulate at the entry because of their tendency to migrate radially towards the axis.
  • the present invention overcomes these drawbacks.
  • the invention also relates to an improved device of the type in question as claimed in claim 1, making it possible to purify high quantities of pasta of the order of five hundred cubic meters per hour (500 m3 / h) and more .
  • the invention consists in providing in the device described in document EP-B-0037 347 of the Applicant, a single rigid central body of generally tapered and convergent shape inside the enclosure, which occupies degressive part of the interval between the supply and exit means, associated with a scooping means arranged in the vicinity of its smallest section and intended to extract the light fraction from the suspension.
  • the scoop system arranged in the central body of revolution of the device converts the residual energy of the vortex (dynamic and static pressure) into static pressure. This avoids back pressure on the outlet side and therefore allows the inlet pressure to be reduced by the same amount, thus resulting in appreciable energy savings.
  • This central body generally comprises scraping or scooping elements of the heavy particles decanted against the internal wall of the rotor, in order to bring them close to the axis and to extract them from the device (see for example FR-A- 1,450,895 (US correspondent US-A-3,467,304); US-A-4,332,350 or GB-A-1,366,170).
  • the central body is necessarily of a different shape from the internal wall of the enclosure, in particular at the level of the scooping devices, so as to bring it back to the vicinity of the central body and to extract from the axis no longer the heavy particles, but the light fraction of the suspension.
  • the invention consists, for this new application and in order to achieve the objective of extracting the light fraction, to define a particular and specific shape of central body with respect to the internal wall of the enclosure, namely converging and positioning the scooping point on this central body at the point of smallest section.
  • the apparatus is in this case particularly suitable for the field of fine purification in diluted paste, because the presence of the central body makes it possible to better channel the flow, in particular at the outlet of the injection channels of the inlet head.
  • the parasitic recirculation flows, as well as the radial variations in the angular speed of the dough, are reduced, which makes the flow more uniform, with in particular a more homogeneous state of agitation.
  • the central body is driven in rotation separately from the rotary body of the device, but jointly with the inlet and / or outlet heads of the suspension, the device is then perfectly suited for purifying suspensions more concentrated.
  • the improvement of the control of the flow in the external peripheral zone is ensured not only by the presence of the central body, but also by the choice of its differential speed of rotation, which makes it possible to re-train the dough in rotation, in order to keep the suspension at the optimum degree of agitation.
  • the differential in speed of rotation of the central body is chosen in accordance with the difference in speed of the suspension relative to the wall at the level of the injection zone, according to the characteristics of the supply head.
  • the enclosure, the supply means, the mobile deflection means, the output means, the rotation drive means are produced in a known manner, in particular according to the teachings of document EP-B-0037 347 referred to in the preamble , for example stainless steel.
  • the internal wall of the enclosure is cylindrical.
  • Figure 1 shows schematically in longitudinal section an apparatus in which the characteristic central body is integral with the enclosure of the apparatus.
  • Figure 2 shows schematically in longitudinal section an apparatus where the central body is adapted to be driven in rotation separately from the enclosure of the apparatus.
  • Figure 3 shows schematically in longitudinal section a preferred embodiment of the invention, while Figure 4 illustrates in cross section a detail of Figure 3 (scooping) along the axis IV-IV '.
  • the central body (11) and the inlet (6) and outlet (7) means constitute an integral assembly driven in rotation separately from the enclosure.
  • the fixed means (5) and (8) are respectively connected to the mobile means (6) and (10) by tight connections (20-24) and (22-23), and the central body has a form of diabolo.
  • This diabolo (11) is also equipped at the periphery with fins (14,15) for driving the suspension to be purified, arranged along generators and equidistant from each other.
  • Bearings (16,17) associated with conventional seals (23,24) allow the central diabolo (11) to rotate around the longitudinal axis (2) at an appropriate speed.
  • the scoop (12) formed in the central body forms a movable means for leaving the light fraction and is extended downstream by a discharge duct (13) disposed along the axis (2).
  • a scoop (18) formed in the outlet head (19) allows the heaviest fraction to be extracted in the peripheral zone (7) by forming the movable means for leaving this heavy fraction.
  • This scoop (18) is extended downstream by an outlet duct (25) arranged along the longitudinal axis (2).
  • Movable means (26) for supplying an auxiliary dilution fluid are provided along the outlet head (19) secured to the central diabolo (11) and are connected, by means of sealed connections (21-22), to fixed means (27) for supplying the auxiliary dilution fluid. It is important that the characteristic scoop (12) is placed in the vicinity of the weakest section of the converging central body (11) and preferably on this point, to properly recover the entire light fraction.
  • washing water minimizes, in the case of paper pulps, the fiber losses which tend to concentrate towards the wall, with heavy contaminants.
  • the continuous evacuation assembly (18,25) of heavy rejects is associated with devices (26,27) for continuous injection of washing water which put take advantage of the space (26) located between the outlet head (19) linked to the central body (11) in diabolo and the outlet flange of the enclosure (1) of the device.
  • the same devices (18,25) can be used alternately for the discontinuous injection of washing water from the heavy fraction and for the discontinuous extraction of the heavy contaminants, the extraction phase being advantageously very short. relative to the washing phase, in order to minimize the heavy refusal losses.
  • the cylindrical enclosure (1) has an internal diameter of 0.75 m for a length of 2.5 m.
  • the inlet cylindrical portion (32) has a diameter of 0.62 m for a length of 0.2 m.
  • the first frustoconical inlet portion (30) has a length of 1.7 m for a diameter which gradually decreases from 0.6 to 0.36 m.
  • the cylindrical scooping section (33) has a length of 0.2 m for a diameter of 0.36 m.
  • the third frustoconical outlet portion (45) has a length of 0.4 m with a diameter which increases from 0.45 to 0.55 m.
  • the orifices (35,36) have a diameter of 0.05 m and the axial duct (47) a diameter of 0.05 m.
  • Such a purifying device can treat flow rates of the order of five hundred cubic meters per hour (500 m3 / h) and more.
  • the fiber concentration of which is of the order of 0 to 3%, preferably of the order of 1.5%
  • the effectiveness of this purifier is between 90 and 99%, with a fiber loss rate of less than 0.5%.
  • the energy consumption is considerably reduced compared to that of an installation comprising two usual purifiers in parallel (21 kw against 2 x 17 kw), a saving to which must be added a saving of pumping energy of 12 kw, for a total of 21 kw against 46 kw for a nominal flow of 450 m3 / hour.
  • This considerable reduction is due to the increase in capacity of the device and the fact that it is no longer necessary to provide back pressure at the outlet of the device.
  • this device can be successfully used for the treatment and purification of various suspensions, such as for example suspensions of various paper pulps, waste water or polluted water, water-petroleum suspensions, etc.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Centrifugal Separators (AREA)
  • Treatment Of Liquids With Adsorbents In General (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
EP89420338A 1988-09-13 1989-09-12 Dispositif pour la séparation sélective de particules dans un liquide, notamment pour l'épuration de suspensions fibreuses papetières Expired - Lifetime EP0359682B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89420338T ATE78533T1 (de) 1988-09-13 1989-09-12 Vorrichtung zur selektiven 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
FR8812156 1988-09-13
FR8812156A FR2636251B1 (fr) 1988-09-13 1988-09-13 Dispositif pour la separation de particules dans un liquide, notamment pour l'epuration de suspensions papetieres

Publications (2)

Publication Number Publication Date
EP0359682A1 EP0359682A1 (fr) 1990-03-21
EP0359682B1 true EP0359682B1 (fr) 1992-07-22

Family

ID=9370102

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89420338A Expired - Lifetime EP0359682B1 (fr) 1988-09-13 1989-09-12 Dispositif pour la séparation sélective de particules dans un liquide, notamment pour l'épuration de suspensions fibreuses papetières

Country Status (11)

Country Link
US (1) US5131544A (fi)
EP (1) EP0359682B1 (fi)
JP (1) JP2661757B2 (fi)
AT (1) ATE78533T1 (fi)
BR (1) BR8907082A (fi)
CA (1) CA1331956C (fi)
DE (1) DE68902205T2 (fi)
ES (1) ES2034729T3 (fi)
FI (1) FI95056C (fi)
FR (1) FR2636251B1 (fi)
WO (1) WO1990002839A1 (fi)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5156586A (en) * 1990-07-10 1992-10-20 Bardyne Orbital separator for orbitally separating a mixture
DE4105903C2 (de) * 1991-02-26 1994-10-06 Escher Wyss Gmbh Vollmantelzentrifuge als Reiniger für Stoffsuspensionen
FI90358C (fi) * 1992-05-19 1994-01-25 Pom Technology Oy Ab Menetelmä ja laite kuitususpension lajittelemiseksi
US5368735A (en) * 1993-03-08 1994-11-29 Claude Laval Corporation Liquid/solid separator with a conduit between a vortex and a quiescent collector zone
US5468396A (en) * 1994-03-16 1995-11-21 Pulp And Paper Research Institute Of Canada Centrifugal cleaning of pulp and paper process liquids
US5578209A (en) * 1994-09-21 1996-11-26 Weiss Enterprises, Inc. Centrifugal fluid separation device
EP0868565B1 (de) * 1995-12-21 1999-12-01 Hermann Finckh Maschinenfabrik GmbH & Co. Gerät zum aufbereiten von für die papier- bzw. pappeproduktion vorgesehenen fasersuspensionen
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
AUPR080100A0 (en) * 2000-10-17 2000-11-09 Filtra Limited A solids separator
SE517532C2 (sv) * 2000-10-25 2002-06-18 Rolf Ekholm Metod och apparat för tvättning av en fibersuspension
CN1291796C (zh) * 2001-10-17 2006-12-27 费尔特拉有限公司 固体分离器
FR2954187B1 (fr) 2009-12-18 2014-08-01 Total Sa Separateur a ecoulement cyclonique.
FR2991593B1 (fr) * 2012-06-11 2017-09-15 Commissariat Energie Atomique Dispositif de fractionnement d'un fluide comportant des particules et d'extraction d'un volume d'interet
US10596580B2 (en) 2016-04-15 2020-03-24 Layne Christensen Company Fluid separator device

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2748668A (en) * 1952-07-11 1956-06-05 Beloit Iron Works Separator-pumping operation for paper stock
FR1115888A (fr) * 1954-12-17 1956-04-30 Séparateur centrifuge à traversée de liquide présentant un grand écartement entre le plan d'entrée du liquide à clarifier et le plan de sortie des matières décantées
FR1450895A (fr) * 1964-10-06 1966-06-24 Werkspoor Nv Centrifugeuse pour la séparation d'un mélange de deux phases liquides en fonctionnement continu
GB1366170A (en) * 1971-10-15 1974-09-11 Ec Corp Processes and apparatus for effecting exchange crystallisation and co mponent separation
SU417167A1 (fi) * 1972-02-15 1974-02-28
FR2478489B1 (fr) * 1980-03-21 1985-08-30 Centre Tech Ind Papier Procede et dispositif pour la separation de particules dans un fluide, notamment pour l'epuration de suspensions papetieres
US4332350A (en) * 1980-07-30 1982-06-01 Mcclellan Jack A Centrifuge apparatus for separating entrained solids from industrial waste water
SU952350A1 (ru) * 1981-01-21 1982-08-23 Московский Ордена Трудового Красного Знамени Институт Химического Машиностроения Гидроциклон-классификатор
ZA839064B (en) * 1982-12-06 1985-07-31 Broken Hill Pty Co Ltd Centrifugal separation method and apparatus

Also Published As

Publication number Publication date
FR2636251B1 (fr) 1992-01-17
FI95056C (fi) 1995-12-11
ATE78533T1 (de) 1992-08-15
FI95056B (fi) 1995-08-31
EP0359682A1 (fr) 1990-03-21
FR2636251A1 (fr) 1990-03-16
WO1990002839A1 (fr) 1990-03-22
JPH03501279A (ja) 1991-03-22
DE68902205D1 (de) 1992-08-27
JP2661757B2 (ja) 1997-10-08
CA1331956C (fr) 1994-09-13
FI902374A0 (fi) 1990-05-11
US5131544A (en) 1992-07-21
BR8907082A (pt) 1991-01-08
ES2034729T3 (es) 1993-04-01
DE68902205T2 (de) 1992-12-10

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