EP2508670B1 - Refinerscheibe oder Refinerscheibensegment - Google Patents

Refinerscheibe oder Refinerscheibensegment Download PDF

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Publication number
EP2508670B1
EP2508670B1 EP11160992.1A EP11160992A EP2508670B1 EP 2508670 B1 EP2508670 B1 EP 2508670B1 EP 11160992 A EP11160992 A EP 11160992A EP 2508670 B1 EP2508670 B1 EP 2508670B1
Authority
EP
European Patent Office
Prior art keywords
disc
teeth
segment
refining
base
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.)
Not-in-force
Application number
EP11160992.1A
Other languages
English (en)
French (fr)
Other versions
EP2508670A1 (de
Inventor
Peter Ek
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.)
Cellwood Machinery AB
Original Assignee
Cellwood Machinery AB
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 Cellwood Machinery AB filed Critical Cellwood Machinery AB
Priority to EP11160992.1A priority Critical patent/EP2508670B1/de
Priority to PCT/EP2012/056164 priority patent/WO2012136704A1/en
Priority to US14/009,600 priority patent/US20140091163A1/en
Publication of EP2508670A1 publication Critical patent/EP2508670A1/de
Application granted granted Critical
Publication of EP2508670B1 publication Critical patent/EP2508670B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills
    • D21D1/306—Discs
    • 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
    • D21D1/004—Methods of beating or refining including disperging or deflaking
    • D21D1/006—Disc mills
    • D21D1/008—Discs

Definitions

  • the present invention relates to the field of refining, and in particular to refining discs or refining disc segments for disc refiners.
  • Disc refiners (sometimes referred to as double-disc refiners) are traditionally used in the pulp- and paper industry for dispersing pulp of recycled paper and thereby improve the appearance of the paper product (e.g. reduce the impurities in the recycled paper pulp to an invisible size).
  • the disc refiners comprise refining discs or refining disc segments.
  • the refining disc segments are arranged to form full refining discs in the disc refiner. Toothed refining discs are sometimes referred to as dispersing discs.
  • US4116392 discloses a pulp refining disc composed of an annular base and sets of radially oriented, tempered knife blades projecting from the base. The knife blades are made of a relatively high temperature resistant material.
  • US5868330 discloses another pulp refining disc comprising a base member and a plurality of refiner bars integrally informed with the base member and extending upwardly from it. Portions of the bars are formed of a material having gains of abrasive imbedded therein such that surface portions of the uppermost surface of each bar wear rough.
  • the inventors have realized that it is desirable to find a structure of the refining discs or refining disc segments that improves their performance and/or resistance to wear.
  • disc refiners may have new applications, such as the disintegration of wood chips or wood pellets and that the new structure is particularly important in such cases.
  • the present disclosure thus provides a refining disc or a segment thereof, comprising a base composed of a cast iron and teeth composed of a metal carbide composite, which teeth protrude from the base, wherein the teeth are partially embedded in the base.
  • the teeth are cast in the base, i.e. fixed in the base by means of casting.
  • the present disclosure also provides a disc refiner comprising a first and a second disc composed of such discs or according, said first and second discs being arranged such that the teeth of the first disc face the teeth of the second disc.
  • a refining disc or a segment thereof comprising a base composed of a cast iron and teeth composed of a metal carbide composite, which teeth protrude from the base, wherein the teeth are partially embedded in the base.
  • the metal carbide composite of the teeth is hard and resistant to wear.
  • the hardness of the metal carbide composite is at least 1000 Vickers (HV10).
  • the metal carbide of the metal carbide composite may for example be WC (tungsten carbide), TiC (titanium carbide), TaC (thallium carbide) or a metal carbonitride, such as TiCN.
  • the metal carbide composite may comprise a metal alloy binder, such as Co (cobalt), Ni (nickel) or Iron (Fe).
  • the metal carbide particles of a metal carbide composite may be evenly distributed in the metallic alloy binder.
  • Such a material is frequently referred to as a cemented carbide.
  • Cemented carbide is normally produced by powder metallurgy.
  • the process of casting cemented carbide teeth into cast iron follows largely common sand molding methods.
  • the teeth may be arranged in their pattern in a sand core and the molding process may be performed in accordance with what is described in the patent application EP 0 374 116 A1 (see e.g. column 3, lines 9-26 and the example). Further information on casting cemented carbide in cast iron is found in the patent application WO 92/13651 (however, in the normal case centrifugal casting is not performed in connection with the present disclosure).
  • the base may be composed of a material having a hardness of HRC 30-70, such as HRC 50-60 (Rockwell scale).
  • HRC 30-70 such as HRC 50-60 (Rockwell scale).
  • HRC 50-60 Rockwell scale
  • the cast iron may for example be ductile iron, grey cast iron or white cast iron.
  • Ductile iron, such as nodular cast iron, may be preferred as it is impact resistant and has a relatively high tensile strength.
  • the grey cast iron may be preferred as it is relatively easy to form in a casting process.
  • the white cast iron may however also be preferred as it is relatively hard (compared to other types of cast iron, such as grey cast iron) and thus relatively resistant to wear during use.
  • the cast iron may for example comprise 1-30 % Cr (chromium), such as 5-30 % Cr, such as 10-30 % Cr, such as 15-30 % Cr. A higher Cr content makes the cast iron harder.
  • White cast iron is one example of a cast iron that may have high Cr content.
  • the cast iron of the present disclosure may also have a lower carbon content and be classified as steel.
  • the refining discs are normally ring shaped.
  • the refining disc of the present disclosure may have such a shape.
  • a plurality of refining disc segments are arranged to form a refining disc in a disc refiner.
  • the refining disc segment of the present disclosure may have the shape of a ring segment. Examples of segments having such a curved shape are shown in figures 4-6 .
  • each segment may have a shape corresponding to 1/4 th 1/6 th or 1/8 th of a ring.
  • the shape may also correspond to half of a ring, a third of a ring, a fifth of a ring or any other fraction of a ring within practical limits.
  • the material to be disintegrated is normally fed centrally, i.e. to the center of the refining discs (see figure 3 ). As the material is disintegrated/refined/dispersed, it moves outwards towards the outer circumference of the refining discs. Thus, the teeth closest to the inner edge of the refining disc/segments work the biggest pieces of material. Therefore, it may be beneficial if the teeth arranged closer to the inner edge are bigger and/or more widely spaced than the teeth arranged closer to the outer edge. This is exemplified in figures 1 and 4-6 .
  • the teeth may have the shape of a pyramid or truncated pyramid (see e.g. figures 1 and 2 ).
  • the base area of a tooth according to the present disclosure may be larger than its top area.
  • the base area of a typical tooth may be 50-400 mm 2 , such as 75-250 mm 2 .
  • the height of a typical tooth may be 5-30 mm, such as 10-20 mm. Normally, at least 5 %, such as at least 10 %, such as at least 15 % of the height of a tooth according to the present disclosure is embedded in the base. Further, less than 50 % of the height is normally embedded.
  • the base are of a tooth according to the present disclosure may for example have the shape of a quadrilateral (foursided polygonal).
  • the top of a tooth of according to the present disclosure may for example be flat, and optionally have the shape of a quadrilateral.
  • a tooth of the present disclosure may have one or two slits as in the refining disc segments marketed by Andritz. The person of skill in the art understands that the embodiments related to the tooth characteristics described in this paragraph not necessarily concern all teeth of the disc or segment. A disc or segment having a few teeth of differing characteristics is still encompassed by the embodiments. It is however preferred that at least the majority, such as at least 75 %, of the teeth have the characteristics of a certain embodiment.
  • a refining disc segment of the present disclosure typically weighs 1-15 kg and has an area of 100-1000 cm 2 .
  • two discs facing each other are arranged such that a row of teeth of one disc run between rows of teeth of another disc when the one disc rotates relative the other.
  • the teeth of the discs may be arranged in concentric rows (see the rows in figures 1 and 4-6 ).
  • the present disclosure also provides a disc refiner comprising a first and a second disc composed of discs or segments according to any one of the embodiments described above, wherein said first and second discs are arranged such that the teeth of the first disc face the teeth of the second disc.
  • a disc refiner two whole refining discs may thus be arranged to face each other.
  • a plurality of refining disc segments may be arranged to form two full discs that face each other.
  • the second disc may be fixed and the first disc may be rotatably arranged such that it may rotate in respect of the second disc.
  • the rotatable disc may be connected to a rotatable shaft.
  • the shaft may be movable in the direction of its elongation such that the gap between the teeth of the first disc and the teeth of the second disc may be adjusted. Accordingly, the degree of disintegration may also be adjusted.
  • An embodiment of a disc refiner is illustrated in figure 3 .
  • the present disclosure also provides a method of disintegration of a material, wherein a disc refiner according to any one of the embodiments described above is used for disintegrating the material.
  • the disc refiner is particularly suitable for the disintegration of a material comprising cellulose fibers.
  • An example of such a material is pulp.
  • the paper pulp may for example be the pulp of recycled paper, which is the type of material traditionally disintegrated with a disc refiner. Other examples of pulp are reject pulp and virgin pulp.
  • Wood-based material such as saw dust, cutter dust, wood chips and, in particular, wood pellets have been found to be difficult to disintegrate.
  • disc refining using discs having teeth of cast iron e.g. the base and the teeth cast in one piece
  • disintegrate wood pellets with a satisfactory result (see figure 7 ) and low energy consumption but to the surprise of the inventors, the wear of the discs during such refining is unacceptable.
  • the inventors found that the disc refining technique works surprisingly well with a wood-based material, such as wood pellets, and the introduction of the teeth of harder material solves the wear problem.
  • alternative machinery such as hammer mills, has been found to be associated with various problems and safety issues.
  • the purpose of disintegrating (raw) wood chips may be to set free drying surfaces or to produce a material having a particle size suitable for wood pellets production.
  • material comprising cellulose fibers are straw, straw briquettes (pucks), agro chips form one-year plants and bagasse.
  • the material may also be torrefied material (torrefied biomass), other types of bio-coal, pellets of torrefied material or pellets of other types of bio-coal.
  • the material may also be pellets of organic material different from the above, such as pellets of an organic compound.
  • materials are organic sludge, household waste, rejects from sewage treatment plants, cotton, tobacco, grain, manure and slaughtering residues.
  • a power plant requested a wood powder (disintegrated wood pellets) according to the following specification: Particle size Proportion ⁇ 2.0 mm > 100% ⁇ 1.5 mm > 99 % ⁇ 0.5 mm > 55 % ⁇ 0.25 mm > 20%
  • the wood pellets are less bulky and more suitable for transport and storage than the wood powder.
  • the wood powder is preferably produced at the site of the power plant.
  • the wood pellets which had a density of 0.670 kg/dm 3 and a dry matter content of 91 %, were disintegrated with a disc refiner (KRIMA Disperser, marketed by Cellwood Machinery) having refining disc segments with widely spaced teeth (marketed by Cellwood Machinery) using the following conditions: Sample no Temp (°C) Disc gap (mm) Density of product (kg/dm 3 ) Motor load (Gross kW) Average load (kW) Flow (dm 3 /min) Specific energy (net kWh/ton dry) 1 25 0.5 0.33 10-15 13 25 9 2 30 2.0 - 15-23 18 50 7
  • the run time was two minutes for both samples.
  • FIG 7b represents the result of sample no 1
  • figure 7a represent the result of sample no 2.
  • the results were considered to meet the specification to a sufficient degree.
  • disc refiners having toothed disc segments were found to successfully disintegrate the wood pellets. At a later time, it was however found that the disc segments were worn down considerably during disintegration of wood pellets.
  • the wear problem is solved by the introduction of teeth of harder material embedded in the base of the disc or segment as described herein.

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  • Paper (AREA)

Claims (15)

  1. Refinerscheibe oder ein Segment (1) davon, aufweisend
    eine Basis (4) bestehend aus Gusseisen, und
    Zähne (5), wobei die Zähne (5) von der Basis (4) abstehen und teilweise in die Basis (4) eingebettet sind,
    dadurch gekennzeichnet, dass
    die Zähne (5) aus einem Metall-Karbid-Komposit aufgebaut sind.
  2. Scheibe oder Segment (1) gemäß Anspruch 1, wobei das Gusseisen Weißguss oder Grauguss ist.
  3. Scheibe oder Segment (1) gemäß einem der vorangegangenen Ansprüche, wobei das Metall-Karbid-Komposit einen Metalllegierungsbinder aufweist, wie zum Beispiel Co, Ni oder Fe.
  4. Scheibe oder Segment (1) gemäß einem der vorangegangenen Ansprüche, wobei das Metall-Karbid des Metall-Karbid-Komposits WC, TiC und/oder TaC ist.
  5. Scheibe oder Segment (1) gemäß einem der vorangegangenen Ansprüche, wobei das Metall-Karbid-Komposit ein Sinterkarbid ist.
  6. Scheibe oder Segment (1) gemäß einem der vorangegangenen Ansprüche, wobei die Härte des Metall-Karbid-Materials mindestens 1.000 Vickers beträgt.
  7. Scheibe oder Segment (1) gemäß einem der vorangegangenen Ansprüche, welche oder welches die Form eines Rings oder eines Ringsegments aufweist.
  8. Scheibe oder Segment (1) gemäß einem der vorangegangenen Ansprüche, aufweisend eine - in radialer Richtung gesehen - innere Kante (2) und eine - in radialer Richtung gesehen - äußere Kante (3), wobei diejenigen Zähne (5), welche näher an der inneren Kante (2) angeordnet sind, größer sind als diejenigen Zähne (5), welche näher an der äußeren Kante (3) angeordnet sind.
  9. Scheibe oder Segment (1) gemäß einem der vorangegangenen Ansprüche, wobei ein Zahngrundflächenbereich der Mehrheit der Zähne (5) im Bereich von 50 - 400 mm2 liegt, wie zum Beispiel im Bereich von 75 - 250 mm2.
  10. Scheibe oder Segment (1) gemäß einem der vorangegangenen Ansprüche, wobei die Zahnhöhe der Mehrheit der Zähne (5) im Bereich von 5 - 30 mm liegt, wie zum Beispiel im Bereich von 10 - 20 mm.
  11. Scheibe oder Segment (1) gemäß einem der vorangegangenen Ansprüche, wobei die Zähne (5) in konzentrischen Reihen angeordnet sind.
  12. Scheiben-Refiner (30) aufweisend eine erste (1a) und eine zweite (1b) Scheibe, welche aus den Scheiben oder Segmenten gemäß einem der vorangegangenen Ansprüche aufgebaut sind, wobei die erste (1a) und die zweite (1b) Scheibe so angeordnet sind, dass die Zähne (5) der ersten Scheibe (1a) in Richtung der Zähne (5) der zweiten Scheibe (1b) weisen.
  13. Scheiben-Refiner (30) gemäß Anspruch 12, wobei die zweite Scheibe (1b) feststehend ist und die erste Scheibe (1a) drehbar angeordnet ist, sodass sie sich im Bezug zu der zweiten Scheibe (1b) drehen kann.
  14. Verfahren zum Zerkleinern eines Materials, wobei ein Scheiben-Refiner (30) gemäß Anspruch 12 oder 13 verwendet wird, um das Material zu zerkleinern.
  15. Verfahren gemäß Anspruch 14, wobei das Material Zellulose-Fasern aufweist.
EP11160992.1A 2011-04-04 2011-04-04 Refinerscheibe oder Refinerscheibensegment Not-in-force EP2508670B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP11160992.1A EP2508670B1 (de) 2011-04-04 2011-04-04 Refinerscheibe oder Refinerscheibensegment
PCT/EP2012/056164 WO2012136704A1 (en) 2011-04-04 2012-04-04 Refining disc or refining disc segment
US14/009,600 US20140091163A1 (en) 2011-04-04 2012-04-04 Refining Disc or Refining Disc Segment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11160992.1A EP2508670B1 (de) 2011-04-04 2011-04-04 Refinerscheibe oder Refinerscheibensegment

Publications (2)

Publication Number Publication Date
EP2508670A1 EP2508670A1 (de) 2012-10-10
EP2508670B1 true EP2508670B1 (de) 2013-08-21

Family

ID=44114333

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11160992.1A Not-in-force EP2508670B1 (de) 2011-04-04 2011-04-04 Refinerscheibe oder Refinerscheibensegment

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US (1) US20140091163A1 (de)
EP (1) EP2508670B1 (de)
WO (1) WO2012136704A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103174049B (zh) * 2013-03-25 2015-02-18 南通醋酸纤维有限公司 浆粕磨片
WO2015044414A1 (en) * 2013-09-30 2015-04-02 Philippe Saint Ger Ag Disperger plate
FR3024951B1 (fr) * 2014-08-21 2021-01-08 Maasson Disque de dispersion pour la trituration a chaud d'une matiere fibreuse
WO2018110855A1 (ko) * 2016-12-14 2018-06-21 민병걸 마이크로 파인바를 포함하는 리파이너 바 플레이트 및 그 제조방법
DE202017100135U1 (de) 2017-01-12 2018-04-15 Valmet Ab Refinerscheibensegment
FI129745B (en) * 2021-04-29 2022-08-15 Valmet Technologies Oy BLADE ELEMENT

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4166584A (en) * 1975-09-05 1979-09-04 Asplund Arne J A Apparatus for producing pulp from lignocellulose-containing material
US4116392A (en) * 1977-02-22 1978-09-26 Inox Industria E Comercio De Aco S/A Pulp refining disk and method of making same
CA1151926A (en) * 1979-10-04 1983-08-16 Macmillan Bloedel Limited Refiner plates
SE464226B (sv) 1988-12-13 1991-03-25 Sandvik Ab Valsring, sammansatt av haardmetall och gjutjaern samt saett foer framstaellning av densamma
SE9100405D0 (sv) 1991-02-11 1991-02-11 Sandvik Ab Vals, sammansatt av haardmetall och gjutjaern, samt saett foer framstaellning av densamma
FR2718469B1 (fr) * 1994-04-08 1996-03-29 Arte Garniture pour raffineur de pâte.
US5690286A (en) * 1995-09-27 1997-11-25 Beloit Technologies, Inc. Refiner disc with localized surface roughness

Also Published As

Publication number Publication date
WO2012136704A1 (en) 2012-10-11
EP2508670A1 (de) 2012-10-10
US20140091163A1 (en) 2014-04-03

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