EP2085510B1 - Vorrichtung zum Trennen und Waschen von in einem Schlamm enthaltenen Fasern - Google Patents

Vorrichtung zum Trennen und Waschen von in einem Schlamm enthaltenen Fasern Download PDF

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Publication number
EP2085510B1
EP2085510B1 EP09290074A EP09290074A EP2085510B1 EP 2085510 B1 EP2085510 B1 EP 2085510B1 EP 09290074 A EP09290074 A EP 09290074A EP 09290074 A EP09290074 A EP 09290074A EP 2085510 B1 EP2085510 B1 EP 2085510B1
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EP
European Patent Office
Prior art keywords
nozzles
filter wall
wall
arm
jets
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Application number
EP09290074A
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English (en)
French (fr)
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EP2085510A1 (de
Inventor
Serge Kocimski
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.)
K PAP SARL
FBI (Fabrication de Batiments Industriels) SA
Original Assignee
K PAP SARL
FBI (Fabrication de Batiments Industriels) SA
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Publication of EP2085510A1 publication Critical patent/EP2085510A1/de
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/40—Washing the fibres
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
    • D21C9/06—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents in filters ; Washing of concentrated pulp, e.g. pulp mats, on filtering surfaces
    • 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 the treatment of sludge, in particular paper mills.
  • the paper is produced in a papermaking unit from fibers suspended in water.
  • These fibers are first laid on a dewatering mat to form a layer, and after dewatering, this layer is mechanically compressed and then heated to form a sheet of paper.
  • Such a manufacturing unit works with large quantities of water: the production of one ton of paper requires about one hundred and fifty tons of water.
  • the different stages of production such as dewatering and compression, generate fibrous suspensions, i.e., water containing less than one to five percent by weight of fiber.
  • the separation is ensured by draining in a filter which can be conical such as that which is marked by 1 in the figure 1 , in order to concentrate the fibers while recovering the water that contains them.
  • the filter according to the figure 1 comprises an enclosure 2 containing a frustoconical filtering wall 3, forming a funnel, and a pipe 4 pouring on this wall the fibrous suspension to be treated, and a rotating head 6 located above the frustoconical wall for watering it with water. water.
  • Such an installation has a diameter of the order of two meters, the basic cone frustum of the filtering wall having an angle of the order of forty-five degrees, and the rotating head rotates at a speed of between five and fifteen revolutions per minute.
  • the fibrous suspension to be reduced is poured into the upper part of the wall 3, and it descends along it forming a mattress covering the entire surface of this wall.
  • the rotary head 6 has several arms supplied with water, such as the arms 7 and 8, which extend parallel to the generatrices of the frustoconical wall.
  • Each arm produces a curtain of continuous water formed by several water jets 11 overlapping, which come from different nozzles 9 spaced from each other along the arm.
  • the water curtain forms a squeegee that lifts the fibrous suspension layer and promotes its flow along the wall 3, while cleaning the wall.
  • This waste is treated in a wastewater treatment plant separate from the paper manufacturing unit. They are first decanted to form the sludge, which is biologically treated, before being spread or shipped to a landfill.
  • Such sludge contains fibers of two to three millimeters in length which are lost while they could be recovered for blending with longer fibers to make paper.
  • the object of the invention is to provide a device for washing the fibers contained in this sludge for use in the manufacture of paper.
  • the subject of the invention is a device for extracting and washing fibers contained in a sludge, comprising a filter wall having a frustoconical shape with a vertical axis opening upwards, a pipe conveying sludge. to be treated in the upper part of this filtering wall, and a rotary head carrying at least one series of nozzles aligned parallel to a generatrix of the frustoconical filtering wall, each nozzle projecting a jet of water towards the filtering wall, in which the nozzles a series of nozzles are arranged to produce jets having imprints on the filter wall which are spaced apart from each other.
  • the mud forms a bead on the inner surface of the filter wall, which has a significant adhesion to the wall. Thanks to this adhesion, the time required for the sludge to descend along the entire wall is large enough that the jets can wash the sludge sufficiently efficiently to extract the fibers.
  • the invention also relates to a device as defined above, wherein the frustoconical filtering wall forms, with respect to a plane normal to its axis of revolution, an angle of between ten and thirty degrees, preferably equaling twenty degrees.
  • a frustoconical filtering wall having a high opening angle contributes to further reducing the speed of travel of the sludge towards the lower opening of this filtering wall, in order to increase the time and efficiency of the washing of this sludge.
  • the invention also relates to a device as defined above, wherein the rotary head comprises at least one arm carrying a series of nozzles producing flat water jets having on the filtering wall indentations spaced from each other, and at least one other arm carrying another series of nozzles producing so-called conical water jets having on the filter wall disk-shaped impressions which are spaced apart from each other.
  • the mud forms a helical bead which dilutes when it passes under a conical jet, and which is gathered on itself as it passes between two adjoining planes.
  • the invention also relates to a device as defined above, in which the pipe is carried by the rotating head while being positioned to deposit sludge on the filtering wall at a position situated upstream of a conical jet taking into account the direction of rotation of the rotating head.
  • the sludge is first diluted by a conical jet, and then collected when the flat jets pass, so that it takes very early form having good adhesion to the filter wall.
  • the invention also relates to a device as defined above, comprising at least one nozzle producing a flat jet having a so-called forward orientation, to produce a jet having on the filtering wall an offset offset forwardly relative to to an orthogonal projection of this nozzle on the filtering wall.
  • the flat jets form squeegee able to take off the mud from the wall to better collect it as a bead.
  • the invention also relates to a device as defined above, comprising at least one nozzle producing a flat jet having a so-called upward orientation, to produce a flat jet having on the filtering wall an inclined imprint towards an upper edge of the filtering wall with reference to the direction of advance of the impression when the head rotates.
  • the invention also relates to a device as defined above, comprising at least one nozzle producing a flat jet having a so-called downward orientation, to produce a flat jet having on the filtering wall an inclined imprint towards an orifice of the wall. filtering by reference to the direction of advancement of the footprint when the head rotates.
  • the invention also relates to a device as defined above, comprising an arm carrying at least one nozzle pointing upwards and at least one nozzle pointing downwards, these nozzles being situated respectively at the upper part and at the lower part of the arm. wearing them.
  • the invention also relates to a device as defined above, comprising an arm carrying a series of nozzles producing flat jets, wherein the nozzles located on the upper two thirds of this arm are oriented upwards, and in which the other nozzles carried by this arm are oriented downwards.
  • the invention also relates to a device as defined above, in which the oriented nozzles upwards are inclined at a decreasing angle from the upper edge of the filter wall.
  • the invention also relates to a device as defined above, wherein the downwardly directed nozzles are inclined at a decreasing angle from the lower edge of the filter wall.
  • the idea behind the invention is to adapt a separation device fibrous suspension operated within a paper manufacturing unit, the treatment of waste from such an installation.
  • first jets called flat jets which agglomerate the cord to pick it up on its own and secondly with second jets called conical jets which spray the cord for wash it.
  • the device according to the invention which is schematically represented in figure 2 being identified by 12 has a general structure of the same type as that of the apparatus of the figure 1 .
  • the filtering wall 14 is made of a material comprising meshes measuring between one hundred and two hundred and fifty microns so as to let the sludge particles pass and recover the fibers.
  • This rotating head comprises firstly one or more arms such as the arm 17 carrying nozzles 21 to 24 which produce flat jets 26 to 29, and secondly one or more arms such as the arm 18 carrying nozzles 31. 34 which produce jets 36 to 39 called conical.
  • the arm 17 extends parallel to the filtering wall, which means that the distance separating it from the latter is substantially constant all along the arm 17.
  • the nozzles 21 to 24 that it carries are spaced apart from each other along this arm by distances such that the jets 26 to 29 they produce do not overlap. On the contrary, there is a substantial gap between the successive jets along the arm 17.
  • the footprints e27 and e28 on the wall 14 of two consecutive flat jets that are the jets 27 and 28 are spaced apart from each other.
  • Each imprint has a rectilinear shape, length L between seven and eight centimeters, and the footprints e27 and e28 are spaced from each other by a gap e of about one centimeter, parallel to the arm 17.
  • the arm 18 also extends parallel to the filtering wall 14, the distance separating it from this wall being the same all along this arm 18.
  • the nozzles 31 to 34 that it carries are also spaced apart from each other. a distance such that the jets 36 to 39 produced by these nozzles do not overlap, and are instead spaced apart from each other.
  • Two consecutive conical jets such as jets 37 and 38 have imprints on the filtering wall 14 which are marked by e37 and e38 in the figure 4 .
  • Each imprint has a disc shape, of a diameter noted L ', and two consecutive jet impressions along the arm are spaced apart by a difference noted e'.
  • the device according to the invention advantageously comprises a number of arms that are much greater, being for example provided with four arms producing flat jets and four arms producing conical jets. Each arm producing conical jets then being interposed, in plan view, between two arms producing flat jets.
  • the rotating head then comprises eight arms, spaced from each other by an eighth of a turn, as in the example of the figure 5 which partially shows such a device in top view.
  • this head also carries a pipe 41 for supplying sludge 42.
  • This pipe extends radially so as to deposit the sludge at the upper part, that is to say peripheral, of the filtering wall 14 by rotating with the head to form the bead of mud.
  • This cord moves very slowly down the filter wall 14 due to its own weight.
  • the cord With reference to the direction of rotation of the head 16, which rotates at a speed of between five and fifteen revolutions per minute, after having been deposited on the filtering wall 14, the cord is sprayed with a first conical jet 36.
  • the large-width cord continues to descend slowly along the wall 14, until it is reached by flat jets produced by the arm 17.
  • the cord of large width then has its center located between the two consecutive flat jets 26 and 27, but its width is greater than the spacing e which separates the footprints e26 and e27 of these two jets on the wall 14.
  • the bead After being reformed by the flat jets 26 and 27, the bead is again swept by a conical jet, not visible in the figure, which corresponds to a new washing step in which other impurities of this mud are evacuated through the filter wall 14, this step causing a new crushing of the bead.
  • the cord thus passes at the level of different arms not visible in the figure, which alternately wash it by crushing it, then put it back in the shape of a cord.
  • the bead was reshaped by passing under the arm 48 which produces the flat jets 43 to 47.
  • the entire cord thus has a general shape of axis AX helicoid projected on the frustoconical filter wall 14, which corresponds to a spiral view from above. As shown in the figure, the cord extends over several turns of the inner surface of the wall 14, and in operation, it travels vertically downwards thereof, that is to say towards its lower opening 15.
  • This cord thus has its upper end continuously renewed by the supply of sludge 42 deposited by the end of the pipe 41, while its lower end is continuously discharged through the lower central opening 15 of the filtering wall 14.
  • the jets and the sludge flow delivered by the pipe 41 are dimensioned in such a way that after being collected or picked up by a pair of plane jets, ie before being washed by a conical jet, the bead has a width 1 which is between half and fifth the diameter D of a conical jet on the wall 14.
  • the nozzles forming the conical jets may be placed opposite the middle of the interval between two flat jets. But the position of these nozzles depends on the operating conditions, in particular the speed of descent of the mud bead and the angle between two successive arms. These nozzles should simply be placed to be in the path of the mud bead.
  • each arm carries four nozzles to produce four jets. But in practice, given the dimensions of the device which is of the order of two meters in diameter, each arm carries a number of nozzles much greater than four.
  • the jets advantageously have specific orientations.
  • the jets producing the flat jets 21 to 23 which are located in the upper two thirds of the arm 17 are oriented upwards to oppose the descent of the cord, and the nozzles located on the lower third of the arms are oriented downward to facilitate its evacuation to the lower opening.
  • nozzles producing flat jets are all oriented to produce inclined jets such as squeegees so as to effectively peel off the sludge from the filter wall 14 to effectively gather this bead.
  • the upwardly directed nozzle 22 produces a flat stream 27 whose rectilinear footprint e27 extends along an axis a27 which is inclined with respect to the line of greatest slope p17 of the wall 14.
  • the axis a27 thus forms an angle D ⁇ noted with the axis p17, this axis p17 also corresponding to the projection on the wall 14 of the arm 17, that is to say at the intersection with the wall 14 of a plane containing the axis of rotation AX of the head 16 and the axis of the arm 17.
  • the impression e27 thus has a lower end i27 which is having more than its upper end s27, in the direction of advance A of the jet along the wall 14.
  • the distance dhi separating the lower end i27 and the axis p17 is greater than the distance dhs separating the upper end s27 and this axis p17.
  • the orientation of the nozzle 21 also gives the flat jet 27 that it produces a forward inclination so that it constitutes a squeegee, which results in the fact that the whole of the footprint e27 is located in before the axis p17.
  • the projection p27 of the nozzle 27 on the wall 14, which is carried by the axis p17, is thus separated from the center c27 of the cavity by a horizontal distance denoted DH.
  • nozzles carried by the lower third of the arm 17 as the nozzle 24 they are inclined downward, which means that they each have a footprint whose upper end is more or as far advanced as the end
  • the lower nozzles are further oriented so that the jets they produce are inclined forwardly.
  • the upward orientation of the upper nozzles of the arm 17 is intended to slow down the descent of the mud bead when in the upper part of the filtering wall 14.
  • the downward orientation of the lower nozzles of the arm 17 is intended to promote the evacuation of the portion of the cord located in the lower part of the wall 14.
  • the orientations of the nozzles 21 to 24 may, instead of being identical for two successive nozzles, evolve gradually along the arm, as in the example of the figure 8 .
  • each nozzle 21 to 23 inclined upwards has an inclination
  • each nozzle 24 inclined downwards has an inclination
  • the angle oriented D ⁇ from the axis of the impression considered towards the axis p17, decreases gradually from the top of the arm 17 towards the bottom thereof, as visible on the figure 8 .
  • the device according to the invention thus makes it possible to treat a low-viscosity sludge, such as a sludge comprising fibers having lengths of less than two millimeters and a half, by regulating the descent of this sludge along the filtering wall 14, in such a way that to avoid that this descent is too fast, thus making the washing of the fibers sufficiently effective.
  • a low-viscosity sludge such as a sludge comprising fibers having lengths of less than two millimeters and a half
  • the conical wall advantageously has an opening angle of between one hundred and twenty and one hundred and sixty degrees, so that the angle of inclination of this wall is between thirty and ten degrees.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Treatment Of Sludge (AREA)
  • Paper (AREA)
  • Filtration Of Liquid (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Claims (11)

  1. Vorrichtung zum Extrahieren und Waschen von in einem Schlamm enthaltenen Fasern, umfassend eine Filterwand (14), die eine kegelstumpfförmige Form mit vertikaler Achse (AX) hat und nach oben offen ist, eine Leitung (41), die den zu behandelnden Schlamm (42) in den oberen Teil dieser Filterwand (14) befördert, und einen Drehkopf (16), der mindestens eine Reihe von Düsen (26-29, 36-39) trägt, die parallel zu einer Mantellinie der kegelstumpfförmigen Filterwand (14) ausgerichtet sind, wobei jede Düse (26-29, 36-39) einen Wasserstrahl auf die Filterwand (14) spritzt, dadurch gekennzeichnet, dass die Düsen (26-29, 36-39) einer Düsenreihe so ausgebildet sind, dass sie Strahlen erzeugen, die auf der Filterwand (14) Abdrücke (e27, e28) haben, die zueinander beabstandet sind.
  2. Vorrichtung nach Anspruch 1, wobei die kegelstumpfförmige Filterwand (14) in Bezug auf eine zu ihrer Drehachse (AX) senkrechte Ebene einen Winkel zwischen zehn und dreißig Grad bildet, der vorzugsweise zwanzig Grad beträgt.
  3. Vorrichtung nach Anspruch 1, wobei der Drehkopf (16) mindestens einen Arm (17) umfasst, der eine Reihe von Düsen (21-24) trägt, die flache Wasserstrahlen erzeugen, die auf der Filterwand (14) Abdrücke (e27, e28) haben, die zueinander beabstandet sind, sowie mindestens einen weiteren Arm (18), der eine weitere Reihe von Düsen (31, 34) trägt, die so genannte konische Wasserstrahlen erzeugen, die auf der Filterwand (14) Abdrücke (e37, e38) in Form von Scheiben haben, die zueinander beabstandet sind.
  4. Vorrichtung nach Anspruch 3, wobei die Leitung (41) von dem Drehkopf (16) getragen wird, indem sie so positioniert ist, dass sie den Schlamm (42) auf der Filterwand (14) an einer Stelle aufbringt, die sich unter Berücksichtigung der Drehrichtung des Drehkopfes (16) stromaufwärts eines konischen Strahls (36) befindet.
  5. Vorrichtung nach Anspruch 3, umfassend mindestens eine Düse (21, 24), die einen flachen Strahl (26-29) erzeugt, der eine so genannte Vorwärtsausrichtung hat, um einen Strahl (26-29) zu erzeugen, der auf der Filterwand (14) einen Abdruck hat, der in Bezug auf ein senkrechtes Spritzen dieser Düse (21, 29) auf die Filterwand (14) einen versetzten Abdruck hat.
  6. Vorrichtung nach Anspruch 5, umfassend mindestens eine Düse (21-23), die einen flachen Strahl (26-28) erzeugt, der eine so genannte Aufwärtsausrichtung hat, um einen flachen Strahl (26-28) zu erzeugen, der auf der Filterwand (14) einen Abdruck (e27) hat, der in Bezug auf die Vorschubrichtung (A) des Abdrucks bei sich drehendem Kopf (16) zu einem oberen Rand der Filterwand (14) geneigt ist.
  7. Vorrichtung nach Anspruch 5 oder 6, umfassend mindestens eine Düse (24), die einen flachen Strahl (29) erzeugt, der eine so genannte Abwärtsausrichtung hat, um einen flachen Strahl (29) zu erzeugen, der auf der Filterwand (14) einen Abdruck (e27) hat, der in Bezug auf die Vorschubrichtung (A) dieses Abdrucks bei sich drehendem Kopf (16) zu einer Öffnung der Filterwand (14) geneigt ist.
  8. Vorrichtung nach den Ansprüchen 6 und 7, umfassend einen Arm (17), der mindestens eine nach oben gerichtete Düse (21-23) und mindestens eine nach unten gerichtete Düse (24) trägt, wobei diese Düsen (21-24) im oberen Teil bzw. im unteren Teil des Arms (17) angeordnet sind, der sie trägt.
  9. Vorrichtung nach Anspruch 8, umfassend einen Arm, der eine Reihe von Düsen (21-24) trägt, die flache Strahlen erzeugen, wobei die Düsen (21-23), die auf den beiden oberen Dritteln dieses Arms (17) angeordnet sind, nach oben gerichtet sind, und wobei die anderen Düsen (24), die von diesem Arm (17) getragen werden, nach unten gerichtet sind.
  10. Vorrichtung nach Anspruch 9, wobei die nach oben gerichteten Düsen (21-23) gemäß einem Winkel ( |Dα| ) geneigt sind, der ab dem oberen Rand der Filterwand (14) abnimmt.
  11. Vorrichtung nach Anspruch 9, wobei die nach unten gerichteten Düsen (24) gemäß einem Winkel ( |Dα| ) geneigt sind, der ab dem unteren Rand der Filterwand (14) abnimmt.
EP09290074A 2008-02-04 2009-02-02 Vorrichtung zum Trennen und Waschen von in einem Schlamm enthaltenen Fasern Active EP2085510B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0800588A FR2927093A1 (fr) 2008-02-04 2008-02-04 Dispositif de separation et de lavage de fibres contenues dans une boue

Publications (2)

Publication Number Publication Date
EP2085510A1 EP2085510A1 (de) 2009-08-05
EP2085510B1 true EP2085510B1 (de) 2010-06-30

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EP (1) EP2085510B1 (de)
AT (1) ATE472632T1 (de)
DE (1) DE602009000047D1 (de)
ES (1) ES2347852T3 (de)
FR (1) FR2927093A1 (de)
PT (1) PT2085510E (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110393967B (zh) * 2019-08-26 2020-12-25 车智路数据管理有限公司 一种污水处理用水中浮物处理装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5839142A (en) * 1996-07-09 1998-11-24 Thermo Fibertek Inc. Stock washer for washing, thickening and classifying solids

Also Published As

Publication number Publication date
ATE472632T1 (de) 2010-07-15
ES2347852T3 (es) 2010-11-04
EP2085510A1 (de) 2009-08-05
PT2085510E (pt) 2010-09-16
DE602009000047D1 (de) 2010-08-12
FR2927093A1 (fr) 2009-08-07

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