EP0045705B1 - Procédé et dispositif pour fractionner des suspensions de particules solides dans un liquide, notamment pour traiter des suspensions fibreuses dans l'industrie papetière - Google Patents

Procédé et dispositif pour fractionner des suspensions de particules solides dans un liquide, notamment pour traiter des suspensions fibreuses dans l'industrie papetière Download PDF

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Publication number
EP0045705B1
EP0045705B1 EP81420103A EP81420103A EP0045705B1 EP 0045705 B1 EP0045705 B1 EP 0045705B1 EP 81420103 A EP81420103 A EP 81420103A EP 81420103 A EP81420103 A EP 81420103A EP 0045705 B1 EP0045705 B1 EP 0045705B1
Authority
EP
European Patent Office
Prior art keywords
sleeve
suspension
flow
low pressures
sequence
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
EP81420103A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0045705A1 (fr
Inventor
Bernard Perrin
Bernard Bianchin
Georges Sauret
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 AT81420103T priority Critical patent/ATE16207T1/de
Publication of EP0045705A1 publication Critical patent/EP0045705A1/fr
Application granted granted Critical
Publication of EP0045705B1 publication Critical patent/EP0045705B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • D21D5/02—Straining or screening the pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water

Definitions

  • the invention relates to a method and a device for the fractionation of suspensions of solid particles in a liquid; it relates more particularly, but not specifically, to a method and a device for treating fibrous suspensions in the paper industry.
  • German patent DE-C-366,127 a horizontal sieve with slots has been associated with fins arranged in the filtrate collection chamber and, rotating in the direction of flow of the suspension to be purified.
  • this device suitable for extracting fiber agglomerates does not make it possible to economically split more individual fibers, by the very fact of the slotted sieve, namely; low flow rates and significant fiber losses, therefore unsuitable for the treatment of very dilute suspensions.
  • Document FR-A-2,232,345 describes a process for draining the milk curd by passing it through a conical filter sleeve which rests on a rigid sole and pressing this sleeve by means of a train of rollers which moves in the direction of flow of the curd and thus ensures its progression.
  • This technique cannot be used to fractionate suspensions, particularly fibrous, because first of all, under the effect of compression, solid particles which one wishes to keep in the retentate would pass through the sleeve, thus preventing separation. selective, and then quickly the particles will agglomerate to form a compact mattress which will then oppose filtration and clog the whole.
  • the object of the invention is a method and a device for the selective separation of a fraction of solid particles in a fibrous suspension in a liquid which is rapid, economical, even at high flow rates and low concentration, for example between 0.2 and 2 g per liter.
  • the invention is suitable for the treatment of paper mill effluents, upstream of the purification station, a treatment in which it is sought to selectively recover the recoverable fibers.
  • the deformation of the section of the sleeve is propagated along a generator and on the external face of this sleeve.
  • the means able to create inside the deformable sleeve a succession of pressures and depressions is formed by an endless belt moving in the opposite direction to the flow of the suspension flow and having rigid bars spaced along of said belt, part of said bars resting transversely and in turn on the flexible sleeve by deforming it.
  • These rigid bars can have shapes and cross sections. Likewise, they can be mounted idly on their axis.
  • the purification device can have several parallel sleeves and a single means capable of creating inside these sleeves a succession of pressures and depressions which then acts simultaneously on said sleeves.
  • the device may also include in the sleeve auxiliary introduction means for the suspension, these means, such as supply conduits, being substantially directed in the direction of the flow of the suspension, in order to compensate for the gradual fall velocities resulting from the reduction in flow rate as the filtrate is evacuated. This also makes it possible to carry out an additional purification of the fibrous fraction to be recovered.
  • a fibrous suspension (2) is sent in a flexible filter sleeve (1), for example in a woven fabric, in the longitudinal direction of said sleeve (1) (direction indicated by arrow A), at the level of the wall (1), the elementary fibers (3) of said suspension are preferably oriented in this direction A.
  • a depression (8) is then formed which in turn detaches the remainder (7) from the mattress (6) and puts the fibers back in the suspension (9). This suspension is then accelerated by the vortex created by the movement of the member (4) along the sleeve (1).
  • the return of which to the suspension is favored.
  • the return in the suspension of the fibers partially engaged in the meshes of the sleeve is due to the speed of the fluid relative to the fabric of the sleeve which creates a boundary layer in which the fine elements can flow through the fabric, while the fibers, one end of which is in front of a mesh generally have the other end in a layer of the fluid more distant from the fabric and whose speed relative to the sleeve is clearly greater than the speed of "crossing" of the fluid through the sleeve; this thus promotes the return of the fibers in the suspension.
  • the fibrous mat (6) when the fibrous mat (6) is formed at the inlet of the sleeve (1), it initially contains not only fibers (recoverable materials) but also "fines” (mineral fillers, fragments of fibers and other materials that are not very valuable) which are "trapped" in the structure of said mattress during its formation and can therefore no longer migrate to the filtering wall.
  • the fibrous mat (6) is released and it is detached from the wall, which releases the “fines "and allows them to be entrained with the liquid through the filter cloth.
  • the fibrous mat (6) is more and more concentrated in fibers.
  • the fibers (3) are preferably arranged in this fibrous mat (6) parallel to the longitudinal axis and therefore will not tend to plant it in the canvas, which limits the tendency to clogging.
  • the preferential orientation of the fibers in the longitudinal direction allows the use of fabrics with larger mesh, which promotes both a better selectivity of the separation (easier evacuation of the "fines") and a more high speed of treatment (higher filtration speed).
  • the filtration effect is also favored by the displacement of the member (4) in contact with the outer wall of the sleeve (1), which "wipes" the drop of runoff which would oppose filtration.
  • the sleeve has neither a blind spot nor a stagnation zone.
  • Figures 1 to 3 illustrate a summary explanation of the phenomena in question.
  • Figures 4 and 5 schematically show a first device for implementing the invention, respectively seen in front section ( Figure 4) and seen in longitudinal section (Figure 5).
  • Figure (6) shows a detail of this device seen from above.
  • FIG. 7 represents another embodiment of the invention.
  • Figures 8 and 9 show respectively in longitudinal and cross section a preferred device of the invention.
  • FIG. 10 is a schematic summary view of an improved installation implementing this method.
  • Figures 4, 5 and 6 show a first device in which the succession of pressures and depressions is caused by deformation of the section of the filter sleeve from the outside and in which this deformation is propagated along a generator of the sleeve and this, in the opposite direction to the flow of the suspension flow.
  • FIG. 6 shows seen from above a detail (deformed to facilitate understanding) of the sleeve (11) fixed by the nuts (14) on the clamping plates (12) on the exterior side and bearing on the interior side on a support (28) tapered in the direction of flow A.
  • this tapered shape gives the sleeve (11) a generally frusto-conical shape that tapers in the direction of flow and this, in order to compensate for the progressive fall in resulting speeds the decrease in flow rate as the filtrate is evacuated.
  • the inclination of the entire system also helps to maintain the speed of the flow by taking advantage of gravity to reduce the effect of the pressure drop.
  • FIG. 7 illustrates another embodiment with a flexible sleeve (11) and deformation from the outside.
  • the deformation is caused by a set of successive parallel rollers (40) spaced along an endless belt (42) driven in continuous rotation by two drive pulleys s (43) and (44) synchronized.
  • These rollers are mounted idly around the axis (41) in order to reduce the friction on the sleeve (11) and thus reduce the wear of this fabric (11) and the energy consumption.
  • a succession of pressures and depressions is thus formed inside the sleeve thanks to these rollers moving in the opposite direction to the flow of the flow of the suspension, only part of said rollers being supported transversely and in turn on the flexible sleeve by deforming it.
  • FIGs 8 and 9 show respectively in longitudinal section and in cross section a preferred device according to the invention.
  • This device essentially comprises a frame (50) mounted on casters (51) which receives a motor (52) which, by means of a variator (53) drives a pulley (54).
  • This motor pulley (54) drives an endless chain (55) which passes over two other return pulleys (56) and (57) carried by the cross-member (58).
  • This horizontal crosspiece (58) also has a tensioning chain guide (59).
  • the chain (55) carries rigid cylindrical bars (60) regularly spaced, so that there is always at least one point of contact between a bar (60) and the deformable sleeve (11).
  • adjustable supports (61) maintain in height and laterally a plate (62) which, seen from above, presents from left to right a generally tapered shape in order to give the sleeve (11) a general frustoconical shape.
  • This assembly (62) is connected to the flexible perforated sleeve (11) produced as previously in a stationery fabric.
  • the upstream end (63) of this fabric (11) is connected, when the time comes, to the conduit (10) for supplying the suspension to be purified, while its downstream end (64) opens into a box (65) where we will recover the concentrated fibers (similar to 27).
  • (66) designates a conduit through which the filtrate will be discharged (similar to the chute 26).
  • a filtrate (in 26) is obtained having an average concentration of solid matter (the values indicated are obtained by the average of 20 measurements) of 0.11 g / liter, while the fibrous fraction accepted in (27) has an average concentration of 7.5 g / liter.
  • the fibrous yield is approximately 75%.
  • Example 2 is repeated with a mud having a solids concentration of 1 g / liter, an ash rate of 45% and a drip index of 75 ° SR (Schopper-Riegler degrees).
  • Example 3 the same mud is used as in Example 3 in a purifier with rigid curved grids of the trade of the type of that described in the preambles.
  • FIGS. 9 and 10 having the following general characteristics:
  • Example 2 Using this device, the same suspension is treated as in Example 1. The same results are obtained, but with a flow rate of the order of 80 m 3 / h.
  • the device is preferably placed on the final sewer, just before the treatment plant or at specific points in the production line.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Filtration Of Liquid (AREA)
  • Filtering Materials (AREA)
  • Detergent Compositions (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
EP81420103A 1980-07-25 1981-07-08 Procédé et dispositif pour fractionner des suspensions de particules solides dans un liquide, notamment pour traiter des suspensions fibreuses dans l'industrie papetière Expired EP0045705B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81420103T ATE16207T1 (de) 1980-07-25 1981-07-08 Verfahren und vorrichtung zum ausscheiden von suspensionen fester teilchen in einer fluessigkeit, insbesondere zum bearbeiten von fasersuspensionen bei der papierfabrikation.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8016756 1980-07-25
FR8016756A FR2487216A1 (fr) 1980-07-25 1980-07-25 Procede et dispositif pour fractionner des suspensions de particules solides dans un liquide, notamment pour traiter des suspensions fibreuses dans l'industrie papetiere

Publications (2)

Publication Number Publication Date
EP0045705A1 EP0045705A1 (fr) 1982-02-10
EP0045705B1 true EP0045705B1 (fr) 1985-10-23

Family

ID=9244681

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81420103A Expired EP0045705B1 (fr) 1980-07-25 1981-07-08 Procédé et dispositif pour fractionner des suspensions de particules solides dans un liquide, notamment pour traiter des suspensions fibreuses dans l'industrie papetière

Country Status (11)

Country Link
US (2) US4477359A (sv)
EP (1) EP0045705B1 (sv)
JP (1) JPS57113814A (sv)
AT (1) ATE16207T1 (sv)
BR (1) BR8104691A (sv)
CA (1) CA1173793A (sv)
DE (1) DE3172704D1 (sv)
ES (1) ES8205571A1 (sv)
FI (1) FI70524C (sv)
FR (1) FR2487216A1 (sv)
NO (1) NO155833C (sv)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA87553B (en) * 1986-01-31 1988-03-30 Water Res Commission Dewatering slurries
WO1997002087A1 (en) 1995-06-30 1997-01-23 Pall Corporation Separation systems and methods
DE60319736T2 (de) 2002-07-12 2008-07-17 Whitewater Solutions Corp., Appleton System zur abtrennung eines in einer flüssigkeit enthaltenen materials von der daneben auch noch partikuläre stoffe enthaltenden flüssigkeit
US6622868B1 (en) * 2002-07-12 2003-09-23 Whitewater Solutions Corp. System for recovering and recycling usable fibers from white water in a papermaking process

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE366127C (de) * 1921-08-20 1922-12-29 Max Mohn Rinnenartiger Planknotenfaenger fuer die Papierherstellung
US1505836A (en) * 1922-09-26 1924-08-19 Moore & White Company Screen box
GB485553A (en) * 1936-08-20 1938-05-20 Emil Gotthold Oesch Improvements in or relating to apparatus for producing liquid pulsations through screens
US2463814A (en) * 1944-11-07 1949-03-08 Marathon Corp Dewatering apparatus
FR1145263A (fr) * 1955-12-30 1957-10-24 Victor Halstrick K G Procédé et dispositif pour le séchage de produits à grains fins, à forte teneur en eau
US3363759A (en) * 1964-04-29 1968-01-16 Bird Machine Co Screening apparatus with rotary pulsing member
US3491021A (en) * 1967-10-18 1970-01-20 Morgan G Huntington Method and apparatus for non-cyclic concentration of solution-suspension
US3672250A (en) * 1970-04-27 1972-06-27 Usm Corp Cutting press having improved means for handling cut product
US3672506A (en) * 1970-05-06 1972-06-27 Jylhavaara Osakeyhtio Pressure strainer device
US3766059A (en) * 1970-12-28 1973-10-16 Toshin Science Co Filtering method and a filtering machine therefor
JPS488910U (sv) * 1971-06-11 1973-01-31
US3833468A (en) * 1971-08-27 1974-09-03 Dorr Oliver Inc System for recovery of fiber from paper mill effluent, including a sieve bend screen
FR2232345A1 (en) * 1973-06-08 1975-01-03 Chanet Jacques Semi-continuous sepn. of cheese curds from whey - by compressing mixt. as it passes through whey-permeable pipe
JPS5389727U (sv) * 1976-12-24 1978-07-22
JPS5474560A (en) * 1977-11-28 1979-06-14 Toray Ind Inc Solid-liquid separating material
DE2836866A1 (de) * 1978-08-23 1980-03-13 Dynofag Ag Verfahren und einrichtung zum abtrennen von fluessigkeiten aus suspensionen
DE2924794C2 (de) * 1979-06-20 1980-11-13 J.M. Voith Gmbh, 7920 Heidenheim Vorrichtung zur Entwässerung einer Faserstoffsuspension
US4337158A (en) * 1980-03-10 1982-06-29 Bodine Albert G Cyclic wave system for unclogging water screens
US4396502A (en) * 1982-03-18 1983-08-02 Beloit Corporation Screening apparatus for a papermaking machine

Also Published As

Publication number Publication date
JPS6328650B2 (sv) 1988-06-09
DE3172704D1 (en) 1985-11-28
FR2487216A1 (fr) 1982-01-29
BR8104691A (pt) 1982-04-06
US4518499A (en) 1985-05-21
NO812530L (no) 1982-01-26
ATE16207T1 (de) 1985-11-15
FI812313L (fi) 1982-01-26
FI70524B (fi) 1986-06-06
EP0045705A1 (fr) 1982-02-10
JPS57113814A (en) 1982-07-15
NO155833C (no) 1987-06-10
NO155833B (no) 1987-03-02
US4477359A (en) 1984-10-16
ES504261A0 (es) 1982-06-16
FI70524C (fi) 1986-09-24
CA1173793A (fr) 1984-09-04
ES8205571A1 (es) 1982-06-16
FR2487216B1 (sv) 1985-02-01

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