EP1105560B1 - Plaque de raffineur a chicanes - Google Patents

Plaque de raffineur a chicanes Download PDF

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Publication number
EP1105560B1
EP1105560B1 EP98940991A EP98940991A EP1105560B1 EP 1105560 B1 EP1105560 B1 EP 1105560B1 EP 98940991 A EP98940991 A EP 98940991A EP 98940991 A EP98940991 A EP 98940991A EP 1105560 B1 EP1105560 B1 EP 1105560B1
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EP
European Patent Office
Prior art keywords
refiner
refining
segment
chicanes
radially
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
EP98940991A
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German (de)
English (en)
Other versions
EP1105560A1 (fr
Inventor
Luc Gingras
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.)
Durametal Corp
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Durametal Corp
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Filing date
Publication date
Application filed by Durametal Corp filed Critical Durametal Corp
Publication of EP1105560A1 publication Critical patent/EP1105560A1/fr
Application granted granted Critical
Publication of EP1105560B1 publication Critical patent/EP1105560B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D21D1/30—Disc mills
    • 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
    • D21D1/30—Disc mills
    • D21D1/306—Discs

Definitions

  • the present invention relates generally to disc refiners for lignocellulosic material. More particularly, the present invention relates to refiner plate segments for such an apparatus.
  • the wood fibers are worked between two relatively rotating discs on which refiner plates are mounted.
  • the plates usually have radial bars and grooves.
  • a large volume of steam is produced between the plates as a result of this refining work.
  • the fibrous material must be retained between the plates on the bar surfaces despite the high velocity of the flowing steam, and the enormous centrifugal forces.
  • the steam is exhausted via the grooves, and dams are provided in the grooves to interrupt material flow and thus improve the retention time of the material in the refining region.
  • the bars provide impacts or pressure pulses which separate and fibrillate the fibers.
  • the grooves enable radially directed feeding of the fibers and steam extraction. Near the perimeter of the plates, high radial steam flow and high centrifugal force both act to sweep the fibers outwardly from between the plates prematurely, thus reducing the refining effectiveness.
  • the flow restrictions due to a small gap between opposed plates and fiber-filled grooves result in a steam pressure peak between the plates, located radially inward from the perimeter. This pressure peak is a major source of the refining thrust load, and can induce control instability at high motor loads. It is thus desirable that the steam generated during refining be discharged from the refining region as quickly as possible, while retaining the pulp within the region as long as possible.
  • the invention includes a refiner plate which is constituted from a plurality of refiner plate segments, each of the segments formed with a pattern including a refining zone having a plurality of radially disposed bar segments.
  • Each of the bar segments has oppositely disposed radially inner and outer ends.
  • a chicane extends obliquely from the outer end of an inner bar segment to the inner end of an outer bar segment to form a zig-zag shaped rib.
  • Adjacent ribs define a plurality of zig-zag shaped grooves alternating with the ribs.
  • the chicanes define at least one substantially arcuate line extending radially and laterally across at least the refining zone.
  • This object is achieved by, in a preferred form, by providing chicanes that form a zig-zag flow path for most of the steam generated during the refining operation.
  • a sloping leading face on each chicane directs the flow of the lignocellulosic material into the gap between the refiner plates for comminution on the grinding surfaces of the bars.
  • the upwelling of lignocellulosic material into the refining gap restricts flow of steam through the gap in the vicinity of the chicanes, the chicanes are positioned to form arcuate lines extending to the peripheral edge of the disc. Consequently, steam may flow in the gap to the edge of the disc in the arcuate corridors formed between the lines of chicanes.
  • the object of achieving good fiber quality with good steam management is accomplished by providing chicanes that direct the fiber into contact with the grinding surface while providing a plurality of flow paths for directing steam through the refining gap to the peripheral edge of the disc.
  • chicanes that direct the fiber into contact with the grinding surface while providing a plurality of flow paths for directing steam through the refining gap to the peripheral edge of the disc.
  • a refiner plate in accordance with the present invention comprises a plurality of refiner plate segments 10 which are securable to the front face 12 of a substantially circular refiner disc 14 ( Figure 2).
  • each segment 10 has two zones 16, 18 each having a differently oriented set of patterns, each segment 10 could alternatively have a single or three or more zones having respective sets of patterns ( Figure 1).
  • the plate segments 10 are attached to the disc face 12, in any convenient or conventional manner, such as by bolts (not shown) passing through bores 20. One end of the bolt engages the disc 14 and at the other end has head structure bearing against a countersunk surface.
  • the refiner plate segments 10 are arranged side-by-side on the face 12 of the disc 14, to form a substantially annular refiner face, shown generally at 22 ( Figure 2).
  • the face 22 forms a portion of a refiner region, when confronting another refiner plate (not shown) carried by another disc.
  • each refiner plate segment 10 has an inner edge 24 near the center of the disc, an outer edge 26 near the periphery of the disc, and leading and trailing side edges 28, 30 which abut the trailing and leading side edges 30, 28 of adjacent refiner plate segments 10', respectively ( Figure 4).
  • the remainder of this description will refer to a single plate segment 10, but it should be understood that all the segments which define the annular plate, are preferably substantially similar.
  • the bars 32, 34 and grooves 36, 38 extend substantially radially, i.e., radially, or parallel to a radius of the disc, or obliquely at an acute angle to such a radius.
  • the plate segment 10 has, on its face, at least one, and preferably two or three, distinct patterns of bars and grooves between the bars, whereby material to be refined can flow in the grooves in the general direction from the inner edge 24 to the outer edge 26 of the plate segment 10, 10'.
  • a first or inlet zone 16 has a multiplicity of bars 34 and grooves 38 between adjacent bars 34, all of which extend substantially in the radial direction. This pattern is especially adapted for receiving wood chips, wood pulp, or the like and performing an initial refining operation thereon to reduce the size of the material and funnel it radially outward into a second, refining zone 18.
  • the refining zone 18 has a multiplicity of bars 32 and grooves 36 between adjacent bars 32, which also extend in parallel, substantially radially.
  • a third, outer zone may be provided between the refining zone 18 and the outer edge 26 of the plate. As shown in Figure 1, each zone 16, 18 may comprise a plurality of fields, where each field has a uniform pattern.
  • the segment has two fields in each zone.
  • the patterns promote the flow of steam radially outward to the outer edge 26 of the disc 14 and radially inward to the inner edge 24 of the disc 14 for evacuation while retarding the flow of material to ensure that the material is fully refined.
  • the partially refined material is directed, as a result of centrifugal force, radially outward.
  • Substantial quantities of steam are also generated in the refining zone 18 producing a steam flow with high radial velocity.
  • the centrifugal forces acting on the steam and partially refined chips increase dramatically as the material moves farther and farther radially outward.
  • the steam be quickly exhausted from the refining region, it is essential that the partially refined fibers not be prematurely exhausted along with the steam. This condition is influenced by the radial pressure profile along the disc face 22 due to steam generated by the refining at high consistency. Since the pressure peak is between the inner and outer edges 24, 26 of the plate, the steam flows forward (radially outward) from the outer side of the pressure peak and backward (radially inward) inside the pressure peak, against the material feed.
  • the refining zone 18 of the refiner plate segment 10 includes a plurality of radially extending first rib segments 40.
  • each first rib segment 40 is connected at its radially outer end 42 to the radially inner end 44 of the next outer first rib segment 40' by a chicane 46.
  • Each chicane 46 comprises a second rib segment that extends obliquely in the direction of disc rotation 48 from the inner first rib segment 40 to the outer first rib segment 40' to form a radially extending zig-zag bar 32.
  • the inner side 50 of each chicane 46 slopes from the top 52 of the chicane 46 toward the adjacent chicane 46' to form a ramp face 54.
  • the grooves 36 formed between adjoining ribs 32 define a zig-zag path substantially across the refining zone 18 for the movement of fibers.
  • the lignocellulosic material traveling in the groove 36 is drawn into the corner of the chicane 46 and up the ramp face 54 of the chicane 46 by centrifugal force.
  • the lignocellulosic material is therefore directed into the space or gap between the opposing refiner plates for additional comminution.
  • the zig-zag path therefore retards movement of the lignocellulosic material, preventing material from exiting the refiner without having being sufficiently refined.
  • the majority of the steam, which is less affected by the centrifugal force, continues traveling in the groove 36 to the periphery of the plate where it exits the refiner.
  • the chicanes 46 define a series of substantially arcuate lines 56.
  • the radially innermost end 58 of the lines 56 define an arc segment 60 positioned intermediate the outer edge 26 of the plate and the junction of the inlet and refining zones 16, 18.
  • Each of the lines 56 extends from the arc segment 60 in the direction opposite to the direction of rotation 48 of the disc to the outer edge 26 of the plate such that the arc formed by the line of chicanes 46 has a substantially uniform radius from a point P.
  • the chicanes 46 of the present invention cause an upwelling of feed material that constricts the plate gap in the vicinity of the chicanes 46.
  • steam generated during the refining operation may flow radially through the corridor 82 between the lines 56, 56' of chicanes 46.
  • the inner most end of the lines of chicanes 46 may be positioned at the junction of the inlet and refining zones 16, 18 and the lines may not extend to the outer edge 26.
  • interrupted bars 84 may be disposed intermediate pairs of zig-zag bars 86, 88.
  • the interrupted bars 84 are formed by providing a gap 90 between the radially outer end 92 of an inner rib segment 94 and the radially inner end 96 of an outer rib segment 98.
  • the gaps 90 are disposed intermediate the chicanes 100 of the zig-zag bar pair 86, 88 and therefore extend obliquely in the direction of disc rotation 48.
  • each line 56 of chicanes 46 that terminate on the trailing side edge 30 of a refiner plate segment 10 is positioned adjacent the radially inner end 63 of a line 56 of chicanes 46 on the leading side edge 28 of the adjacent refiner plate segment 10'. Consequently, the line of chicanes 56 may extend across two refiner plate segments 10, 10' to provide a continuous line from the arc segment to the outer edge 26 of the plate.

Landscapes

  • Paper (AREA)
  • Crushing And Grinding (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Confectionery (AREA)

Claims (16)

  1. Segment d'une plaque à raffineur (10), adapté pour être fixé à un disque d'un raffineur à disques pour le raffinage de matières lignocelluloses, ce disque portant une pluralité de ces segments de plaque à raffineur, ce segment de plaque à raffineur ayant une zone de raffinage (18) avec bouts radiaux intérieurs et extérieurs ainsi qu'une pluralité de segments à barrette (40, 40') disposés essentiellement radialement et que chacun de ces segments à barrette a des bouts radiaux intérieurs et extérieurs opposés (44, 42), caractérisé en ce que la zone de raffinage a en outre une pluralité de chicanes (46), chacune de ces chicanes s'étendant en biais du bout extérieur radial (42) d'un segment à barrette intérieur (40) au bout radial intérieur (44) d'un segment à barrette extérieur (40') pour ainsi former une barrette zigzaguée (32), une pluralité de rainures zigzaguées (36) étant disposées entre barrettes adjacentes, les chicanes (46) définissant au moins une ligne essentiellement arquée (56).
  2. Segment de raffineur (10) selon la revendication 1, caractérisé en ce que le segment est rotatif à un sens de rotation (48), et les chicanes (46) s'étendent au sens de rotation.
  3. Segment de raffineur (10) selon la revendication 2, caractérisé en ce qu'au moins une ligne (56) s'étend à un sens opposé au sens de rotation (48).
  4. Segment de raffineur (10) selon la revendication 1 à 3, caractérisé en ce que chacune des chicanes (46) a une face supérieure (52) et un côté avant (50), ce côté avant s'inclinant de la surface supérieure vers une chicane adjacente pour former une rampe (54).
  5. Segment de raffineur (10) selon la revendication 1, caractérisé en ce que les chicanes (46) définissent une pluralité de lignes (56) essentiellement arquées s'étendant radialement et latéralement à travers le segment.
  6. Segment de raffineur (10) selon la revendication 1, caractérisé en ce que la ligne (56) de chicanes (46) s'étend à partir d'un point entre les bouts intérieur et extérieur de la zone de raffinage (18) vers le bout extérieur de la zone de raffinage.
  7. Segment de raffineur (10) selon la revendication 1, caractérisé en ce que la zone de raffinage (18) définit une pluralité de fentes (90) s'étendant en biais à partir du bout radial extérieur (92) d'un segment à barrette (94) au bout radial intérieur (96) d'un segment à barrette (98) extérieur, pour former au moins une barrette interrompue (84), cette barrette interrompue étant disposée entre une paire de barrettes zigzaguées (86, 88).
  8. Raffineur avec disques relativement opposés (14), chacun de ces disques (14) ayant une arête extérieure et une pluralité de segments (10, 10') de plaque de raffinage, caractérisé en ce que les plaques de raffinage (10, 10') montées sur les disques (14) sont conformes à la revendication 1 et que les zones de raffinage (18) des segments (10, 10') sont combinés à former une zone de raffinage du raffineur, les chicanes (46) ayant une pluralité de lignes arquées (56) s'étendant radialement et latéralement à travers la zone de raffinage.
  9. Raffineur selon la revendication 8, caractérisé en ce qu'au moins un des disques (14) est rotatif à un sens de rotation (48) et les chicanes (46) des segments (10) s'étendent au sens de rotation.
  10. Raffineur selon la revendication 9, caractérisé en ce que les lignes arquées (56) des segments (10) s'étendent en direction opposée au sens de rotation.
  11. Raffineur selon la revendication 8, caractérisé en ce que cette pluralité de segments de plaque a des premiers et deuxièmes segments de plaque (10, 10'), chacun de ces segments de plaque ayant une arête avant (28) et une arête arrière (30) et l'arête arrière (30) du premier segment de plaque (10) étant adjacente à l'arête avant (28) du deuxième segment de plaque (10'), au moins une des lignes (56) comportant une première partie avec bout extérieur (62) terminant à l'arête arrière (30) du premier segment de plaque (10) et une deuxième partie ayant un bout intérieur (63) naissant à l'arête avant (28) du deuxième segment de plaque (10').
  12. Raffineur selon la revendication 11, caractérisé en ce que le bout extérieur (62) de la première partie est disposée adjacent au bout intérieur (63) de la deuxième partie pour former une ligne continue (56).
  13. Raffineur selon la revendication 8, caractérisé en ce que le disque (14) a en outre une zone d'entrée intérieure (16) pour la matière lignocellulose, ainsi qu'une zone de raffinage radiale extérieure (18) pour raffiner la matière lignocellulose, ces segments à barrettes (40, 40') et ces chicanes (46) étant disposés dans la zone de raffinage.
  14. Raffineur selon la revendication 13, caractérisé en ce que chacune de ces lignes (56) a un bout radial intérieur (58) positionné entre l'arête extérieure (26) du disque (14) et la zone d'entrée (16) et que chacune de ces lignes s'étend vers l'arête extérieure du disque.
  15. Raffineur selon la revendication 8, caractérisé en ce que ces disques opposés (14) définissent une fente de raffinage et les lignes (56) de ces chicanes (46) définissent une pluralité de passages dans cette fente de raffinage.
  16. Procédé pour conduire le flux de matière d'alimentation et de vapeur, généré entre une paire de disques de raffinage (14) opposés relativement rotatifs définissant une fente de raffinage, pendant le raffinage d'une matière lignocelluose dans un raffineur, chacun des disques ayant des arêtes intérieure et extérieure (24, 26) ainsi qu'un dessin de surface avec zone de raffinage (18) ayant une pluralité de segments à barrette (40, 40') disposés essentiellement radialement, chacun de ces segments ayant des bouts radiaux intérieurs et extérieurs disposés opposés (44, 42), une pluralité de chicanes (46), chacune de ces chicanes s'étendant en biais à partir du bout radial extérieur (42) d'un segment à barrette intérieur (40) au bout radial intérieur (44) d'un segment de barrette extérieur (40') pour former une barrette zigzaguée (32) ayant une face d'attaque supérieure, les chicanes ayant une face avant inclinée (50) et définissant une pluralité de lignes (56) essentiellement arquées s'étendant radialement et latéralement à travers la zone de raffinage vers le bout extérieur (26) du disque ainsi qu'une pluralité de rainures zigzaguées (36) alternant avec les barrettes, ce procédé se composant des étapes suivantes :
    1. conduite de la matière d'alimentation vers le haut le long de la face avant inclinée (50) de la chicane (46) vers la fente de raffinage, une force centrifuge étant générée par la rotation d'au moins un des disques de raffinage pour le broyage sur la surface d'attaque de la barrette (32);
    2. conduite de la première partie de la vapeur à travers les rainures (36) vers l'arête extérieure (26) des disques par la force centrifuge, et de par là, élimination de la première partie de la vapeur d'entre les disques ; ainsi que
    3. conduite de la deuxième partie de la vapeur à travers la fente de raffinage entre lignes adjacentes (56) de chicanes (46) vers l'arête extérieure (26) des disques par la force centrifuge, et de par là, élimination de la deuxième partie de vapeur d'entre les disques.
EP98940991A 1998-08-19 1998-08-19 Plaque de raffineur a chicanes Expired - Lifetime EP1105560B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1998/017162 WO2000011264A1 (fr) 1998-08-19 1998-08-19 Plaque de raffineur a chicanes

Publications (2)

Publication Number Publication Date
EP1105560A1 EP1105560A1 (fr) 2001-06-13
EP1105560B1 true EP1105560B1 (fr) 2003-04-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP98940991A Expired - Lifetime EP1105560B1 (fr) 1998-08-19 1998-08-19 Plaque de raffineur a chicanes

Country Status (10)

Country Link
EP (1) EP1105560B1 (fr)
KR (1) KR20010106423A (fr)
CN (1) CN1097126C (fr)
AT (1) ATE238447T1 (fr)
AU (1) AU742445B2 (fr)
BR (1) BR9815989A (fr)
CA (1) CA2337419C (fr)
DE (1) DE69813910T2 (fr)
NO (1) NO313297B1 (fr)
WO (1) WO2000011264A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8028945B2 (en) * 2007-05-31 2011-10-04 Andritz Inc. Refiner plates having steam channels and method for extracting backflow steam from a disk refiner
CN103100471B (zh) * 2011-11-11 2015-04-22 吴进驻 乳化研磨装置
US9968938B2 (en) * 2012-09-17 2018-05-15 Andritz Inc. Refiner plate with gradually changing geometry
US10166546B2 (en) * 2013-05-15 2019-01-01 Andritz Inc. Reduced mass plates for refiners and dispersers
DE102015202318A1 (de) * 2015-02-10 2016-08-11 Voith Patent Gmbh Mahlgarnitur
US10953405B2 (en) * 2015-06-11 2021-03-23 Valmet Technologies, Inc. Blade element
CN111979825A (zh) * 2020-06-09 2020-11-24 南通华严磨片有限公司 一种具有仿生鸭嘴形导流端的定子疏解齿板

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI73256C (fi) * 1984-10-19 1987-09-10 Yhtyneet Paperitehtaat Oy Malsegment.
SE456223B (sv) * 1987-02-25 1988-09-19 Sunds Defibrator Malelement for skivraffinor
US5373995A (en) * 1993-08-25 1994-12-20 Johansson; Ola M. Vented refiner and venting process

Also Published As

Publication number Publication date
NO313297B1 (no) 2002-09-09
CN1303451A (zh) 2001-07-11
NO20010527D0 (no) 2001-01-31
EP1105560A1 (fr) 2001-06-13
DE69813910T2 (de) 2004-02-12
AU742445B2 (en) 2002-01-03
WO2000011264A1 (fr) 2000-03-02
BR9815989A (pt) 2001-05-02
DE69813910D1 (de) 2003-05-28
AU8914698A (en) 2000-03-14
NO20010527L (no) 2001-01-31
CN1097126C (zh) 2002-12-25
KR20010106423A (ko) 2001-11-29
ATE238447T1 (de) 2003-05-15
CA2337419A1 (fr) 2000-03-02
CA2337419C (fr) 2004-07-20

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