EP2452012A1 - Appareil de classage de suspensions fibreuses - Google Patents

Appareil de classage de suspensions fibreuses

Info

Publication number
EP2452012A1
EP2452012A1 EP10796769A EP10796769A EP2452012A1 EP 2452012 A1 EP2452012 A1 EP 2452012A1 EP 10796769 A EP10796769 A EP 10796769A EP 10796769 A EP10796769 A EP 10796769A EP 2452012 A1 EP2452012 A1 EP 2452012A1
Authority
EP
European Patent Office
Prior art keywords
slots
drum
respect
screening
ridges
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.)
Granted
Application number
EP10796769A
Other languages
German (de)
English (en)
Other versions
EP2452012A4 (fr
EP2452012B1 (fr
Inventor
Risto Ljokkoi
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.)
Andritz Oy
Original Assignee
Andritz Oy
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 Andritz Oy filed Critical Andritz Oy
Publication of EP2452012A1 publication Critical patent/EP2452012A1/fr
Publication of EP2452012A4 publication Critical patent/EP2452012A4/fr
Application granted granted Critical
Publication of EP2452012B1 publication Critical patent/EP2452012B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/06—Rotary screen-drums
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/16—Cylinders and plates for screens

Definitions

  • the present invention relates to an apparatus for screening fibers and corresponding in the chemical pulp and paper industry, especially coarse screening for separating coarse particles, such as knots, stones and other solid particles from fiber suspension.
  • the invention relates to an apparatus having a rotating screen drum.
  • a typical screen structure has a feed conduit for fiber suspension that may have been produced in digestion of wood chips or in a defibrator for secondary pulp fibers.
  • a suspension can include knots, slivers, bark particles, dirt, metal particles and other non-desired substances.
  • the fiber suspension flows in the vicinity of a cylindrical screen, often referred to as a plate or a basket, whereby acceptable fiber fraction, the accept, passes through the screen plate, while the reject remains on the first side of the screen plate and exits via a reject opening in the casing.
  • a cylindrical screen plate i.e. screen drum
  • the cylindrical screen plate passes by impulse or turbulence elements for intensifying the flow of the fiber suspension through the surface of the screen plate, and thus also the screening is intensified.
  • the screen plate has apertures, either holes or slots, having a size suitable for the screening process. The size of the screen plate apertures has to be appropriate so that the accepted fibers get through the screening surface while the non-desired substance is prevented from passing through.
  • EP-patent publication 275967 presents a method and an apparatus for knot separation, wherein approximately a lower MC-consistency level (6-8 %) is achieved.
  • the increase of usable consistency range is achieved by proper dimensioning and design of the profile of the screening surface and by optimizing the rota- tional speed of the screen drum and the feed velocity of the pulp in respect to each other.
  • the direction of rotation of the drum is the same as the feed direction of the pulp and the reject discharge direction is the same as the direction of rotation of the drum.
  • the screen drum is profiled so that ridges are provided on the outer surface of the drum between the screen apertures, which ridges are comprised of front surfaces ascending in a declined position from the outer surface of the drum and of rear surfaces that are essentially perpendicular against the outer surface.
  • the declination angle of the ridges in relation to the drum axis is between -45 and +45 degrees.
  • the apertures on the drum can be holes or slots, but typically the screening surface of this kind of screens is provided with round holes, the diameter of which can vary in the range of 5-15 mm depending on the object of application.
  • EP 1357222 (US2004004032) describes a fine screen for fiber suspension having a stationary screen drum, inside which a blade member rotates cleaning the screening surface.
  • the screening surface is provided with elongated apertures having a width of 1-8 mm, and a ratio of length and width between 2 and 20.
  • An object of this republic- cation is to increase the proportion of long fibers in the accept.
  • US-patent 490417 presents a screen having a stationary screen drum. Slots in the screening surface are parallel to each other, but can de declined with respect to the axis of the drum.
  • An object of the present invention is to provide a rotating screen drum for a coarse screen, by means of which high consistencies (even over 6 %) can be reached, but in a way that is more energy-efficient than before.
  • the present invention relates to an apparatus for screening fiber suspension, espe- cially coarse screening for removing coarse particles, such as knots, comprising a casing, a feed conduit for fiber suspension and outlet conduits for reject and accept, a drum arranged inside the casing and rotating with respect to the vertical axis, the screening surface of which drum is provided with apertures, wherethrough the accept fraction flows, the feed and outlet conduits of said apparatus being arranged so that the fiber suspension is fed in a space between the casing and the screen drum and the accept is discharged from the interior of the screen drum.
  • the apertures in the screening surface are slots, the longitudinal direction of which in relation to the direction of rotation of the drum being between -40 degrees and +40 degrees and the ratio of the length and the width of the slots being 1.05-10, and said slots form rows of slots and the outer side of the screening surface is profiled such that ridges are provided between the rows of slots.
  • the longitudinal direction/longitudinal axis of the apertures is between -30 and +30 degrees with respect to the direction of rota- tion of the drum, preferably between -15 and +15 degrees.
  • the direction of the longitudinal extension of the apertures is essentially the same as the direction of rotation of the drum, i.e. perpendicular to the longitudinal axis of the screen drum.
  • the slots are of rectangular or oval shape. The edges of their ends are rectangular or rounded. A typical slot is elongated. The width is typically 4-12 mm. The ratio of the length and the width of the slots is 1.05-10, preferably 2-8.
  • the slots are arranged one above another in the axial direction of the drum, whereby rows/zones of slots are formed, which are located at a distance from each other in the circumferential direction of the drum.
  • rows/zones of slots are formed, which are located at a distance from each other in the circumferential direction of the drum.
  • vertical rows of slots are in a declined position.
  • the outer side of the screening surface of the drum is profiled such that ridges are arranged between the rows/zones of slots.
  • the outer surface refers to the side of the drum whereto the fiber suspension is fed and wherefrom the accept fraction flows through the apertures to the other surface, and whereon the reject fraction remains.
  • the profile ridges are preferably arranged so that they are at an angle of -5...+20 degrees, typically 15 degrees with respect to the vertical axis of the drum.
  • the line of the vertical rows of slots with respect to the ver- tical axis of the drum may vary so that the ends of the slots form a line that is essentially parallel to the ridges, i.e. typically in a declined position in respect to the longitudinal axis of the drum.
  • the profile is formed of ridges having a front surface and a rear surface at a certain angle with respect to the plane of the screen surface and possibly therebetween a surface essentially parallel to the plane of the plate.
  • the front surface of the profile ridge can according to an embodiment be also perpendicular against the plane of the screen surface, whereby the rear surface is descending. In this case the front surface opposes to and mixes the flow, whereby the flow through the screening surface increases, and thus the capacity of the apparatus increases, but simultaneously the separating capacity decreases.
  • the front surface and the rear surface of the ridge of the profile can also be symmetrically declined.
  • profile ridges are arranged also in the slot zone so that ridges are provided between the slots located one above another.
  • the profile is formed by a row of ridges broken by slots.
  • the slot zone may be provided with one or more thus formed profiles, which are at the same declination angle with respect to the vertical axis of the drum as the rows/zones of slots and the profiles between them. That is, the ridges are parallel to the rows of slots.
  • the slots of the vertical rows of slots are in the horizon- tal direction arranged so that the slots of every second row of slots are located on the same horizontal lines, i.e. in a first group of horizontal lines, and respectively the slots of every second row of slots are located in a second group of horizontal lines.
  • the longitudinal position/angle of the slots located in one row of slots with respect to the direction of rotation of the drum changes from above downwards seen along the axis of the drum.
  • the longitudinal direction of the uppermost slot is parallel to the direction of rotation of the drum.
  • the longitudinal direction of a lower slot is declined downwards, starting from the front end of the slot in the direction of rotation of the drum, whereby the front end of the slot is located higher than its trailing end (in the direction of rotation of the drum).
  • a lower slot is declined downwards more than an upper one.
  • the angle of declination of the lower slot is 1-5, typically 2-4 degrees larger.
  • the longitudinal direction of the uppermost slot is also parallel to the direction of rotation of the drum, while the following lower slot is declined upwards with respect to the direction of rotation, whereby the front end of said slot, in the direction of rotation of the drum, is located lower than its trailing end.
  • the next lower slot is declined at the trailing end upwards to a greater extent than the upper slot.
  • the declination angle of the lower slot is 1-5, typically 2-4 degrees larger.
  • two slots located one above another can be es- sentially parallel, but it is pertinent that most of the slots in a row of slots are located at different declination angles with respect to each other.
  • the position/angle of the longitudinal direction of the slots in one row of slots with respect to the direction of rotation changes from down upwards seen along the drum axis so that the longitudinal direction of the lowermost slot is parallel to the direction of rotation of the drum, while a slot located above is declined with respect to the direction of rotation.
  • the next upper slot can be declined upwards, whereby the front end of the slot in the direction of rotation of the drum is located lower than the trailing end of the slot.
  • the upper slot is more declined than the lower slot.
  • the declination angle of the upper slot is 1-5, typically 2-4 degrees larger.
  • an upper slot can be declined correspondingly so that the front end of the slot in the direction of rotation of the drum is located higher than the trailing end of the slot. In that case, the slots are declined downwards with respect to the direction of rotation.
  • two slots located one above another can be essentially parallel, such as two lowermost, but it is pertinent that most of the slots in a row of slots are located at different declination angles with respect to each other.
  • the capacity of the apparatus increases and the consistency is higher.
  • the separating capacity of the apparatus is increased, i.e. cleaner accept is obtained.
  • the apparatus according to the embodiments of the present invention allows separation of coarse particles, such as knots and corresponding, from the fiber suspension more efficiently than before and at a higher consistency (even over 6%). Thanks to the elongated slots, the speed of the screen drum can be increased, because the "projections" of the slots remain adequately large. A greater speed allows a higher consistency. If the screening surface is provided with circular holes, the upper speed limit is met earlier, because with increasing speed the holes get clogged faster, as their projection is decreased. In the apparatus according to the embodiments of the invention, the screening is more energy efficient, typically due to either a decreased rotational speed or increased capacity.
  • Figure 2 illustrates a screening surface according to an embodiment as a view from above
  • Figures 3a and b illustrate a screening surface according to another embodiment as a view from above
  • Figure 4 illustrates a screening surface according to an embodiment as a view from above
  • Figure 5 illustrates a screening surface profile according to an embodiment as a straightened and cut side view
  • Figures 6 a, b, c and d illustrate screening surfaces according to some embodiments as a view from above.
  • FIG. 1 illustrates a screen according to a preferred embodiment of the invention, which screen comprises an essentially cylindrical outer casing 1 , to which casing a fiber suspension inlet conduit 2, an accept outlet conduit 3 and a reject outlet conduit 4 are connected, a screen drum 5 and one or more stationary blades 6 inside the screen drum 5, which extend in the vicinity of the screen drum's surface.
  • the rotating screen drum 5 is attached in a way known per se to a shaft 7 functioning e.g. by belt drive (not shown).
  • the space 8 between the screen drum 5 and the outer casing 1 is annular.
  • the above mentioned conduits 2 and 4 are connected to the outer casing 1 of the annular space.
  • the fiber suspension is fed into the space 8 and the accept flown through the screening surface is discharged from the interior of the screen drum.
  • the blades 6 are attached by means of arms 9 to a stationary frame 10, which also forms a support for the shaft 7 via bearings.
  • the blades 6 are located inside the drum 5.
  • said blades generate a suitable impulse, positive and negative, onto the drum 5, thus cleaning the screening surface of the drum.
  • Figure 2 illustrates a straightened screening surface profile according to a preferred embodiment.
  • the profile plate 20 is formed of apertures 21 and profiles 22 between them.
  • the apertures 21 are slots in accordance with the invention.
  • the form of the slots is rectangular, whereby the edges of their ends can be either rectangular or rounded.
  • the ratio of the length L and width W of the slots is 1.05-10, preferably 2-8, depending on the object of application.
  • the width W is typi- cally 4-12 mm.
  • the longitudinal direction 23 of the slots 21 is parallel to the direction 24 of rotation of the drum 5.
  • slots are arranged one above another, whereby rows/zones 11 of slots are formed at a distance from each other in the circumferential direction of the drum.
  • the profile ridges 22 and the vertical rows of slots are not aligned with respect to the vertical axis of the drum, but they are declined rows.
  • the ridges and rows of slots are at an angle of -5...+20 degrees, typically 15 degrees, angle ⁇ , with respect to the vertical shaft 7 of the drum.
  • the slots of the vertical rows 11 of slots can be arranged in the horizontal direction so that they form parallel horizontal rows.
  • Figure 2 illustrates an alternative embodi- ment, where the slots 21 of the vertical rows 11 of slots are in the horizontal direction arranged so that the slots of every second row of slots are located on the same horizontal lines.
  • the slots of the vertical rows of slots are in the horizontal direction arranged so that the slots of every second vertical row 11 of slots are located on the same horizontal lines, i.e. in a first group of horizontal lines 12a, and respectively the slots of every second row of slots are located in a second group of horizontal lines 12b.
  • Figure 4 illustrates profiles of the outer surface of the plate 20.
  • the screening surface can be regarded to be formed of a plate with ridges 22 and planar portions 26 therebetween, which are provided with machined apertures 21.
  • profile ridges are additionally provided in the zone of slots so that ridges 25 are arranged between slots located one above another.
  • the profile is formed by a row of ridges broken by slots.
  • the slot zone may be provided with one or more thus formed profiles, which are preferably at the same declination angle with respect to the vertical axis of the drum as the rows/zones 11 of slots and the profiles 22 between them.
  • Figure 5a and b illustrate a screening surface profile as a straightened and cut side view.
  • the inner surface 27 plate 20 is flat, except for the apertures.
  • the outer surface profile ridge 22 of the plate 20 is formed of front surfaces 29 ascending at a certain angle from the plane 28 of the plate 20, surfaces 30 essentially parallel to the plane 28 of the plate 20, rear surfaces 31 essentially perpendicular to the plane 28 of the plate 20 and portions 26 of the plane 28 between the apertures 21.
  • the screen plate can be regarded as being formed of a plate provided with ridges 22 formed of said parts 29, 30 and 31, and between them planar parts 28 provided with machined apertures 21.
  • the front surface 29 is perpendicular against the plane 28 of the plate and the rear surface is declined.
  • the declined front surface receives the pulp entering the drum, aiming e.g. to accelerate its speed, but an even flow through the screening surface apertures in the screening surface is obtained anyway. This eliminates disturbing flow of the suspension in the opposite direction, which happens under some circumstances.
  • the front surface of the profile ridge is perpendicular against the plane of the screening surface and the rear surface of the ridge is descending ( Figure 5a) the front surface resists and mixes the flow, whereby the flow through the screening surface increases, and thus the capacity of the apparatus increases.
  • the ridges 22 are somewhat declined with respect to the axis of the drum, as well as with respect to the direction of rotation of the drum.
  • the direction of the ridges 22 has the influence that if the ridges 22 on the screen drum 5 are declined backwards, they tend to lift the fiber suspension upwards on the screen drum, whereby the circulation time of the fiber suspension in the screen is increased, separation becomes more exact and the reject amount is decreased while the accept amount is increased.
  • the circulation time is decreased and the capacity is increased.
  • the height of the screen drum has an influence on the operational speeds, declination angles etc.
  • the position of the longitudinal direction 23 of the slots 21 in one row of slots with respect to the direction 24 of rotation of the drum changes from up downwards seen along the shaft 7 of the drum ( Figure 6a).
  • the longitudinal direction of the uppermost slot 21 ' is parallel to the direction of rota- tion of the drum (i.e. perpendicular with respect to the axis of the drum). Meanwhile, the longitudinal direction of a next lower slot 21" is declined (with respect to the axis of the drum), starting from the front end 32 of the slot in the direction of rotation of the drum, whereby the front end 32 of the slot is located higher than its trailing end 33 (in the direction of rotation of the drum). Thus, the next lower slot is declined downwards more than the upper one.
  • the declination angle of the lower slot is typically 1-5 degrees, typically 2-4 degrees larger. In this kind of embodiment, the change in the direction of the slots can be regarded as descending from above downwards. According to another embodiment (Fig.
  • the longitudinal direction of the uppermost slot is also parallel to the direction of rotation of the drum, while a following lower slot is declined upwards with respect to the direction of rotation, whereby the front end 32 ' of said slot, in the direction of rotation of the drum, is located lower than its trailing end 33 ' .
  • the next lower slot is declined at the trailing end upwards to a greater extent than the upper slot.
  • the declination angle of the lower slot is 1-5, typically 2-4 degrees larger.
  • the change in the direction of the slots can be regarded as ascending from above downwards.
  • two slots located one above another can be essentially parallel, but it is pertinent that most of the slots in a row of slots are located at different declination angles with respect to each other.
  • the position/angle of the longitudinal direction of the slots in one row of slots with respect to the direction of rotation of the drum changes from down upwards seen along the drum's axis so that the longitudinal direction of the lowermost slot is parallel to the direction of rotation of the drum, while a slot located next above is declined with respect to the direction of rotation.
  • the next upper slot can be declined upwards ( Figure 6c), whereby the front end 32" of the slot in the direction of rotation of the drum is located lower than the trailing end 33" of the slot.
  • the upper slot is more declined than the lower slot.
  • the declination angle of the upper slot is 1-5, typically 2-4 degrees larger.
  • the change in the direction of the slots can be regarded as from down upwards ascending.
  • an upper slot can be declined correspondingly so that the front end 32 '" of the slot in the direction of rotation of the drum is located higher than the trailing end 33 "' of the slot.
  • the slots are declined downwards with respect to the direction of rotation.
  • the change in the direction of the slots can be regarded as from down upwards descending.
  • the slots are declined downwards (Fig. 6a and d)
  • a greater capacity is obtained.
  • the slots are declined upwards (Fig. 6b and c)
  • higher cleanliness is achieved, as contaminated particles flow from above downwards.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Combined Means For Separation Of Solids (AREA)

Abstract

La présente invention concerne un classeur pour suspension fibreuse, particulièrement pour éliminer des particules grossières, ledit classeur comprenant un boîtier (1), des conduits (2, 3, 4) raccordés audit boîtier pour que la suspension fibreuse soit distribuée dans l’appareil et pour les rejetés et les acceptés déchargés, un tambour (5) qui est agencé à l’intérieur du boîtier et qui tourne par rapport à son axe vertical, la surface de classage dudit tambour étant pourvue d’ouvertures (21) à travers lesquelles la fraction acceptée s’écoule. Les conduits d’alimentation et de sortie sont agencés pour que la suspension fibreuse soit distribuée dans un espace (8) entre le boîtier et le tambour de classeur et l’accepté soit déchargé à partir de l’intérieur du classeur tambour. Les ouvertures dans la surface de classage sont des fentes, dont la direction longitudinale par rapport à la direction de rotation (24) du tambour est entre -40 degrés et + 40 degrés et le rapport de la longueur et de la largeur est 1,05 à 10. Les fentes forment des rangées (11) de fentes et le côté extérieur de la surface de classage est profilé pour que des arêtes (22) soient prévues entre les rangées de fentes.
EP10796769.7A 2009-07-07 2010-06-10 Appareil de classage de suspensions fibreuses Not-in-force EP2452012B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20095769A FI20095769A (fi) 2009-07-07 2009-07-07 Laite kuitususpension käsittelemiseksi
PCT/FI2010/050482 WO2011004060A1 (fr) 2009-07-07 2010-06-10 Appareil de classage de suspensions fibreuses

Publications (3)

Publication Number Publication Date
EP2452012A1 true EP2452012A1 (fr) 2012-05-16
EP2452012A4 EP2452012A4 (fr) 2012-12-05
EP2452012B1 EP2452012B1 (fr) 2014-01-15

Family

ID=40935850

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10796769.7A Not-in-force EP2452012B1 (fr) 2009-07-07 2010-06-10 Appareil de classage de suspensions fibreuses

Country Status (7)

Country Link
EP (1) EP2452012B1 (fr)
JP (1) JP2012532999A (fr)
CN (1) CN102472008A (fr)
BR (1) BRPI1014007A2 (fr)
FI (1) FI20095769A (fr)
RU (1) RU2012104023A (fr)
WO (1) WO2011004060A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101438798B1 (ko) * 2012-02-08 2014-09-05 서울대학교산학협력단 매크로셀­펨토셀 기지국 간 협력 운용 방법
JP6248616B2 (ja) * 2013-12-25 2017-12-20 セイコーエプソン株式会社 シート製造装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1631585A (en) * 1927-06-07 Screen plate
US3713541A (en) * 1971-05-10 1973-01-30 Bird Machine Co Screening machine with slotted screen
SE450711B (sv) * 1985-11-14 1987-07-20 Besam Ag Silorgan
FI76139C (fi) * 1987-01-19 1988-09-09 Ahlstroem Oy Foerfarande och anordning foer kvistseparering.
US4795560A (en) * 1987-04-16 1989-01-03 The Black Clawson Company Screen plates
CN2069430U (zh) * 1990-07-20 1991-01-16 上海造纸机械总厂沪光分厂 异形筛板
FI89521C (fi) * 1991-10-04 1993-10-11 Cae Investments Bv Foerfarande foer framstaellning av en silprodukt och genom foerfarandet framstaelld silprodukt
DE10217926A1 (de) * 2002-04-23 2003-11-13 Voith Paper Patent Gmbh Verfahren zum Nasssieben von Faserstoffsuspensionen
DE502006008007D1 (de) * 2005-10-19 2010-11-18 Voith Patent Gmbh Siebvorrichtung zur Nasssiebung von Papierfasersuspensionen

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
No further relevant documents disclosed *
See also references of WO2011004060A1 *

Also Published As

Publication number Publication date
EP2452012A4 (fr) 2012-12-05
EP2452012B1 (fr) 2014-01-15
FI20095769A0 (fi) 2009-07-07
CN102472008A (zh) 2012-05-23
WO2011004060A1 (fr) 2011-01-13
RU2012104023A (ru) 2013-08-20
FI20095769A (fi) 2011-01-08
JP2012532999A (ja) 2012-12-20
BRPI1014007A2 (pt) 2016-04-12

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