EP2508670A1 - Refining disc or refining disc segment - Google Patents
Refining disc or refining disc segment Download PDFInfo
- Publication number
- EP2508670A1 EP2508670A1 EP11160992A EP11160992A EP2508670A1 EP 2508670 A1 EP2508670 A1 EP 2508670A1 EP 11160992 A EP11160992 A EP 11160992A EP 11160992 A EP11160992 A EP 11160992A EP 2508670 A1 EP2508670 A1 EP 2508670A1
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- European Patent Office
- Prior art keywords
- disc
- teeth
- segment
- refining
- base
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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
- D21D1/306—Discs
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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
- D21D1/004—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.
- 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 first 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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Abstract
Description
- 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.
- 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. In particular, they have found that 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.
- Further, the inventors have found that the combination of a cast iron base and metal carbide composite teeth provides the desired refining disc structure.
- 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. Preferably 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.
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Figure 1 is a top view of a refining disc segment according to an embodiment of the present disclosure. -
Figure 2 is a simplified radial cross section view of a refining disc segment according to an embodiment of the present disclosure. -
Figure 3 is a cross-section view of a disc refiner. -
Figure 4 shows various examples of refining discs segments (a-c), of which four are needed to form a full disc (d). The teeth of 4a are widely spaced. The teeth of 4b are medium spaced. The teeth of 4c are closely spaced. -
Figure 5 shows various examples of refining discs segments (a-c), of which six are needed to form a full disc (d). The teeth of 5a are widely spaced while the teeth of 5b are closely spaced. -
Figure 6 shows various examples of refining discs segments (a-c), of which eight are needed to form a full disc (d). The teeth of 6a are widely spaced. The teeth of 6b are medium spaced. The teeth of 6c are medium+ spaced. -
Figure 7 shows the result a disintegration of pellets using segments having a tooth geometry and a teeth pattern according to embodiments of the present disclosure. The diagrams shall be interpreted as the proportion of disintegrated material that is larger than a cut-off determined by a sieve. The numbers on the x-axis are in millimeter (mm). - There is thus provided 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. To cast prefabricated teeth in the base has proven to be a particularly suitable fixation technique.
- The metal carbide composite of the teeth is hard and resistant to wear. Typically, 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. Further, 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. Thus, the hardness and strength of the metal carbide is combined with the toughness and plasticity of 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. To produce discs or segments of the present disclosure, 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 applicationWO 92/13651 - The hardness requirements for the base material are much lower than for the teeth. For example, the base may be composed of a material having a hardness of HRC 30-70, such as HRC 50-60 (Rockwell scale). Thus, a cheaper and in at least in some aspects more workable material may be used for the base. However, the base must be capable of fixing the teeth, and cast iron generally meets this requirement. 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.
- In commercial disc refiners, the refining discs are normally ring shaped. Thus, the refining disc of the present disclosure may have such a shape. Sometimes, a plurality of refining disc segments are arranged to form a refining disc in a disc refiner. Thus, 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 . Thus, each segment may have a shape corresponding to 1/4th 1/6th or 1/8th of a ring. The skilled person understands that 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. - In disc refiners, 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 infigures 1 and4-6 . - The teeth may have the shape of a pyramid or truncated pyramid (see e.g.
figures 1 and2 ). Thus, 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 mm2, such as 75-250 mm2. Further, 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. It is generally preferred that at least 2 mm of the height of a tooth according to the present disclosure is embedded in the base to obtain a sufficient fixation. 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 cm2.
- In some disc refiners, 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. To facilitate such rotation of one disc relative another, the teeth of the discs may be arranged in concentric rows (see the rows in
figures 1 and4-6 ). - 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. In such a disc refiner, two whole refining discs may thus be arranged to face each other. Alternatively, a plurality of refining disc segments may be arranged to form two full discs that face each other. In the disc refiner construction, the second disc may be fixed and the first disc may be rotatably arranged such that it may rotate in respect of the first 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. As an example, 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. Thus, 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. Here, it may also be noted that the disintegration of wood pellets with 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.
- Other examples of 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.
- Further examples of materials are organic sludge, household waste, rejects from sewage treatment plants, cotton, tobacco, grain, manure and slaughtering residues.
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Figures 1 and2 show a refining disc segment 1 according to an embodiment of the present disclosure. Six such segments may be arranged to form a full refining disc having an annular shape as shown inFig 5a and 5c . The segment 1 has aninner edge 2 and an outer edge 3. The segment 1 comprises abase 4 andteeth 5, which are embedded and fixed in thebase 4. In this particular embodiment, theteeth 5 have the shape of truncated pyramids. In the context of the present disclosure, the shape is considered to be pyramidal even though the surface plane of one side of theteeth 5 is perpendicular to the plane of thebase 4. Theteeth 5 are arranged in concentric rows, which allow theteeth 5 of a full disc to run between the teeth of an opposed disc when rotating in respect of the opposed disc. The distance betweenteeth 5 in the rows of an inner portion 6 of the segment 1 is generally greater than the distance between theteeth 5 in the rows of an outer portion 7 of the segment 1. Further, theteeth 5 closer to theinner edge 2 are bigger, i.e have a lager base area and/or a greater height and thus a bigger volume, than theteeth 5 closer to the outer edge 3. The inner portion 6 of the segment 1 may be referred to as the pre-milling zone, while the outer portion 7 may be referred to as the milling zone. The segment 1 has twoholes 8 which allow it to be fixed in a disc refiner apparatus. -
Fig 3 show part of adisc refiner 30. Thedisc refiner 30 comprises arotor 32 onto whichrefining disc segments 1 a are attached. Therotor 32 is connected to arotating shaft 33.Refining disc segments 1 b are also fixedly attached opposed to therefining disc segments 1 a on therotating body 32. Theshaft 33 may be moved in the direction of its elongation so as to adjust the width of the gap between thesegments disc refiner 30 through itsinlet 31. The material moves outwards (radially) as it is disintegrated, and the disintegrated material is collected in the collectingzone 34, from where is may be transported further (in the case of disintegrated pellets, to combustion or intermediate storage). -
Figure 4 shows three examples 4a, 4b, 4c of refining disc segments according to embodiments of the present disclosure. The teeth closer to the inner edges of the segments are generally bigger and more widely spaced than the teeth closer to the outer edges of the segments. Four segments according tofigure 4 may be arranged in a disc refiner to form one full refining disc 4d. A disc refiner having two opposing discs thus need eight segments according tofigure 4 . A segment according tofigure 4 typically weighs 1.5-3 kg. -
Figure 5 shows two examples 5a, 5b of refining disc segments according to embodiments of the present disclosure. The teeth closer to the inner edges of the segments are generally bigger and more widely spaced than the teeth closer to the outer edges of the segments. Six segments according tofigure 5 may be arranged in a disc refiner to form one full refining disc 5c. A disc refiner having two opposing discs thus need twelve segments according tofigure 5 . A segment according tofigure 5 typically weighs 5-7 kg. -
Figure 6 shows three examples 6a, 6b, 6c of refining disc segments according to embodiments of the present disclosure. The teeth closer to the inner edges of the segments are generally bigger and more widely spaced than the teeth closer to the outer edges of the segments. Eight segments according tofigure 6 may be arranged in a disc refiner to form one full refining disc 6d. A disc refiner having two opposing discs thus need 16 segments according tofigure 6 . A segment according tofigure 6 typically weighs 7-10 kg. - 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. Thus, the wood powder is preferably produced at the site of the power plant.
- The wood pellets, which had a density of 0.670 kg/dm3 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/dm3) Motor load (Gross kW) Average load (kW) Flow (dm3/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.
- The results are presented in
figure 7. Figure 7b represents the result of sample no 1, andfigure 7a represent the result of sample no 2. The results were considered to meet the specification to a sufficient degree. Thus, 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.
Claims (15)
- 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 disc or segment according to claim 1, wherein the cast iron is white cast iron or grey cast iron.
- The disc or segment according to any one of the preceding claims, wherein the metal carbide composite comprises a metal alloy binder, such as Co, Ni or Fe.
- The disc or segment according to any one of the preceding claims, wherein the metal carbide of the metal carbide composite is WC, TiC and/or TaC.
- The disc or segment according to any one of the preceding claims, wherein the metal carbide composite is cemented carbide.
- The disc or segment according to any one of the preceding claims, wherein the hardness of the iron carbide material is at least 1000 Vickers.
- The disc or segment according to any one of the preceding claims, having the shape of a ring or a ring segment.
- The disc or segment according to a any one of the preceding claims, having a radially inner edge and a radially outer edge, wherein the teeth arranged closer to the inner edge are bigger than the teeth arranged closer to the outer edge.
- The disc or segment according to any one of the preceding claims, wherein a tooth base area of the majority of the teeth is 50-400 mm2, such as 75-250 mm2.
- The disc or segment according to any one of the preceding claims, wherein the tooth height of the majority of the teeth is 5-30 mm, such as 10-20 mm.
- The disc or segment according to any one of the preceding claims, wherein the teeth are arranged in concentric rows.
- A disc refiner comprising a first and a second disc composed of discs or segments according to any one of the preceding claims, said first and second discs being arranged such that the teeth of the first disc face the teeth of the second disc.
- The disc refiner according to claim 12, wherein the second disc is fixed and the first disc is rotatably arranged such that it may rotate in respect of the first disc.
- Method of disintegration of a material, wherein a disc refiner according to claim 12 or 13 is used for disintegrating the material.
- Method according to claim 14, wherein the material comprises cellulose fibers.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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EP11160992.1A EP2508670B1 (en) | 2011-04-04 | 2011-04-04 | Refining disc or refining disc segment |
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 |
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EP11160992.1A EP2508670B1 (en) | 2011-04-04 | 2011-04-04 | Refining disc or refining disc segment |
Publications (2)
Publication Number | Publication Date |
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EP2508670A1 true EP2508670A1 (en) | 2012-10-10 |
EP2508670B1 EP2508670B1 (en) | 2013-08-21 |
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Application Number | Title | Priority Date | Filing Date |
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EP11160992.1A Not-in-force EP2508670B1 (en) | 2011-04-04 | 2011-04-04 | Refining disc or refining disc segment |
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US (1) | US20140091163A1 (en) |
EP (1) | EP2508670B1 (en) |
WO (1) | WO2012136704A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103174049A (en) * | 2013-03-25 | 2013-06-26 | 南通醋酸纤维有限公司 | Pulp abrasive disc |
WO2016027019A1 (en) * | 2014-08-21 | 2016-02-25 | Maasson | Dispersion disc for the hot refining of a fibrous material |
CN110088394A (en) * | 2016-12-14 | 2019-08-02 | 闵丙杰 | Refiner band rod milling disk and its manufacturing method including ultra-fine stick |
EP3568520B1 (en) | 2017-01-12 | 2021-01-27 | Valmet AB | Methods for manufacturing a refiner disc segment |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015044414A1 (en) * | 2013-09-30 | 2015-04-02 | Philippe Saint Ger Ag | Disperger plate |
FI129745B (en) * | 2021-04-29 | 2022-08-15 | Valmet Technologies Oy | Blade element |
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US4116392A (en) * | 1977-02-22 | 1978-09-26 | Inox Industria E Comercio De Aco S/A | Pulp refining disk and method of making same |
EP0374116A1 (en) | 1988-12-13 | 1990-06-20 | Sandvik Aktiebolag | Roll ring, comprising cemented carbide and cast iron, and method for manufacture of the same |
WO1992013651A1 (en) | 1991-02-11 | 1992-08-20 | Sandvik Ab | Roll cast in one piece, comprising cemented carbide and cast iron, and method for its manufacture |
US5868330A (en) * | 1995-09-27 | 1999-02-09 | J & L Fiber Services, Inc. | Refiner disc with localized surface roughness |
Family Cites Families (3)
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US4166584A (en) * | 1975-09-05 | 1979-09-04 | Asplund Arne J A | Apparatus for producing pulp from lignocellulose-containing material |
CA1151926A (en) * | 1979-10-04 | 1983-08-16 | Macmillan Bloedel Limited | Refiner plates |
FR2718469B1 (en) * | 1994-04-08 | 1996-03-29 | Arte | Garnish for dough refiner. |
-
2011
- 2011-04-04 EP EP11160992.1A patent/EP2508670B1/en not_active Not-in-force
-
2012
- 2012-04-04 US US14/009,600 patent/US20140091163A1/en not_active Abandoned
- 2012-04-04 WO PCT/EP2012/056164 patent/WO2012136704A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4116392A (en) * | 1977-02-22 | 1978-09-26 | Inox Industria E Comercio De Aco S/A | Pulp refining disk and method of making same |
EP0374116A1 (en) | 1988-12-13 | 1990-06-20 | Sandvik Aktiebolag | Roll ring, comprising cemented carbide and cast iron, and method for manufacture of the same |
WO1992013651A1 (en) | 1991-02-11 | 1992-08-20 | Sandvik Ab | Roll cast in one piece, comprising cemented carbide and cast iron, and method for its manufacture |
US5868330A (en) * | 1995-09-27 | 1999-02-09 | J & L Fiber Services, Inc. | Refiner disc with localized surface roughness |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103174049A (en) * | 2013-03-25 | 2013-06-26 | 南通醋酸纤维有限公司 | Pulp abrasive disc |
WO2016027019A1 (en) * | 2014-08-21 | 2016-02-25 | Maasson | Dispersion disc for the hot refining of a fibrous material |
FR3024951A1 (en) * | 2014-08-21 | 2016-02-26 | Maasson | DISPERSION DISK FOR HOT ROTATING A FIBROUS MATERIAL |
CN110088394A (en) * | 2016-12-14 | 2019-08-02 | 闵丙杰 | Refiner band rod milling disk and its manufacturing method including ultra-fine stick |
EP3568520B1 (en) | 2017-01-12 | 2021-01-27 | Valmet AB | Methods for manufacturing a refiner disc segment |
EP3568520B2 (en) † | 2017-01-12 | 2024-04-17 | Valmet AB | Methods for manufacturing a refiner disc segment |
Also Published As
Publication number | Publication date |
---|---|
US20140091163A1 (en) | 2014-04-03 |
EP2508670B1 (en) | 2013-08-21 |
WO2012136704A1 (en) | 2012-10-11 |
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