EP0422314B1 - A method and device for the production of cellulose pulp of improved quality - Google Patents

A method and device for the production of cellulose pulp of improved quality Download PDF

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Publication number
EP0422314B1
EP0422314B1 EP89850341A EP89850341A EP0422314B1 EP 0422314 B1 EP0422314 B1 EP 0422314B1 EP 89850341 A EP89850341 A EP 89850341A EP 89850341 A EP89850341 A EP 89850341A EP 0422314 B1 EP0422314 B1 EP 0422314B1
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EP
European Patent Office
Prior art keywords
suspension
consistency
pump
hydrocyclone unit
flow
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
EP89850341A
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German (de)
English (en)
French (fr)
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EP0422314A1 (en
Inventor
Nils Anders Lennart Wikdahl
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Individual
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Individual
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Application filed by Individual filed Critical Individual
Priority to DE198989850341T priority Critical patent/DE422314T1/de
Priority to DE68914666T priority patent/DE68914666T2/de
Priority to AT89850341T priority patent/ATE104382T1/de
Priority to ES89850341T priority patent/ES2023626T3/es
Priority to EP89850341A priority patent/EP0422314B1/en
Priority to DD90343169A priority patent/DD296722A5/de
Priority to JP3500294A priority patent/JPH0781240B2/ja
Priority to BR909006945A priority patent/BR9006945A/pt
Priority to PCT/SE1990/000648 priority patent/WO1991005912A1/en
Priority to CA002042366A priority patent/CA2042366C/en
Publication of EP0422314A1 publication Critical patent/EP0422314A1/en
Priority to NO912197A priority patent/NO178348C/no
Publication of EP0422314B1 publication Critical patent/EP0422314B1/en
Application granted granted Critical
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • 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
    • D21D5/18—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force
    • D21D5/24—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force in cyclones
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water

Definitions

  • the present invention relates to a method and a device for the treatment of suspensions of cellulose fibers, which are to be cleaned and concentrated, wherein the cleaning also encompasses the elimination of light impurities.
  • hydrocyclones Cleaning out light impurities by means of hydrocyclones is also previously known, particularly in the treatment of recycled paper, which often contains significant amounts of waste plastic and ink etc.
  • the hydrocyclones normally used in this case are dimensioned and disposed in such a way that the base fraction contains the light impurities and the apex fraction the major portion of the input cellolose fibers.
  • Hydrocyclones for this purpose are also known in which both fractions are taken out at the same end through separate outlets.
  • the first mentioned type of hydrocyclone is referred to below as an A-cyclone, while the second is referred to as a B-cyclone.
  • the suspension produced by whatever method is first diluted to be able to be screened and/or cyclontreated, whereafter the cleaned suspension is thickened to be able to be intermediately stored.
  • This thickening is normally done in open thickeners.
  • This thickening, intermediate storage and dilution involves extra costs, which can be eliminated by concentrating the pulp coming from the cycloning step and directly leading it to the wet machine, particulary by using the same pump for the primary cycloning step and a closed thickener working under pressure, as disclosed in Swedish Lay-open Print 8305036-9.
  • One purpose of the present invention is to provide an improved system for manufacturing paper pulp of good quality, aspecially as regards elimination of impurities, both in the form of heavy and light particles.
  • Light particles are meant to include not only particles of low density, but also particles which due to their shape perform as lighter than cellulose fibers in hydrocyclones).
  • Another purpose is to provide a system which eliminates the need for thickening for intermediate storage of already cleaned pulp suspension. Instead, the invention provides an essentially continous process which performs, in one sequence, cleaning, concentration and final treatment in a wet machine or paper machine.
  • One particular advantage of the invention is the synergetic effect achieved by the combination of the functions of thickening and cleaning from light impurities, preferably whilst simultaneously eliminating an intermediate storage step and a diluting step.
  • hydrocyclones function best if the liquid flows and pressure ratios are kept rather constant at the rated values.
  • This recycling can be done to a point immediately in front of the main pump, without changing the fiber flow to the wet machine or paper machine, but with the result that the consistency of the suspension to the headbox will be increased.
  • the feedback can be to a point prior to the consistency control in connection with a first dilution, thus keeping the consistency of the suspension to the headbox constant and reducing the flow to the headbox.
  • the schematic figure shows an example of a plant functioning in accordance with the invention.
  • the major portion of the fiber material passing through it flows from a conventional silo 1 to a wet machine or paper machine 9 along a main path drawn as a thick line.
  • the pulp with a consistency of 10-12% is diluted in the lower portion of the silo 1 to about 3.5%, and is diluted at the input side of a pump 103 to a controlled consistency of 3.0% and is then led to a silo 2, where the level is kept constant.
  • the diluting water is taken via a pump 12 from the white water of the wet or paper machine.
  • the level and consistency in the silo 2 will be controlled and therefore it is sufficient to state that the dilution is controlled by actuating the valves 100 and 101 by the sensor 102 and the level by the level sensor 200, which controls the speed regulator 104 to the pump 103.
  • 105 is a control unit which opens the valves 100 and 101 in parallel and controls the flow therethrough in a predetermined ratio. In the silo 2, there is thereby achieved a constant level and a constant consistency for the suspension.
  • the suction side of the pump 3 is connected to the silo 2, and it receives diluting water from the pump 12 via the valve 300, which is controlled by the sensor 301, which senses the consistency of the suspension exiting from the pressure side of the pump 3. The consistency is controlled thereby to 2.5%.
  • the flow of the suspension supplied is led through a valve 400 under the control of a flow sensor 401 at a desired level. The flow of fibers through the valve 400 is thus kept constant.
  • the pump 4 a centrifugal pump, provides an essentially constant flow, and the pressure on the suction side is determined by the level in the white water tank 10, the level of which is kept constant in a known manner.
  • the suspension thus diluted is led through a screen 5, which is primarily intended to eliminate scrap particles and other larger particles, which could damage the cyclones, to a multi-hydrocyclone unit 6 with A-cyclones, the base fraction of which is conducted further.
  • the consistency of the base fraction will be 0.45%, i.e. somewhat thinner than the suspension supplied.
  • This base fraction is moved on without intermediate pumping to a multi-hydrocyclone unit 7 with B-cyclones, where the fiber is removed as an apex fraction, which the lighter particles go into the base fraction.
  • the cellulose fibers are enriched to a higher consistency, in the example to 1.5%, thus thickened by a factor of 3.33.
  • the headbox thus receives the suspension at a controlled pressure.
  • the sensor 801 can be a level sensor or a flow sensor.
  • Recovery units are connected to the two multi-hydrocyclone units 6 and 7.
  • the recovery units are shown here as cascade coupled units with individual pumps at the inlets and with the outlets connected to a common level in the tank 10. Although only two steps in each unit have been shown, the number of steps is determined by the desired degree of recovery and purification.
  • the recovery units to the unit 6 consist of A-cyclones, while the recycling units to unit 7 are B-cyclones.
  • the unit 7 provides both a cleaning from light impurities and a thickening of the suspension thus cleaned, which combination is the great advantage of the invention.
  • This thickening can be done in different degrees depending on the cyclone dimensions, the pressure drop and the distribution of apex and base flows of the incoming suspension.
  • the thickening factor which always exceeds 1, and in this example is 3.33, can be increased to 5 for example, if so required, and this can be done without negatively effecting the separation of light impurities: on the contrary, the separation effect will tend to increase.
  • the fiber content in the base fraction may thereby increase, so that the processing work in the recovery units increases.
  • the above mentioned thickening is a result of separation of water and fibers.
  • the degree of thickening in a hydrocyclone is determined by the effectiveness of this separation.
  • the hydrocyclone is made with a smaller base opening than the apex opening.
  • the conical separation chamber should have a largest diameter of less than 125 mm and preferably less than 100 mm.
  • the diameter of the base opening should be less than a fifth of the largest diameter of the separation chamber.
  • hydrocyclones should be operated with predetermined liquid flows.
  • the consistency at constant flow, can be controlled by controlling the flow and consistency of the suspension supplied via the valve 400.
  • the flow to the headbox 8 can be controlled by a return line 13 with the valve 130 controlled by a pressure sensor 131.
  • This return line 13 can, in accordance with the first embodiment, open into the suction side of the pump 4, which will cause the fiber flow to the headbox 8 to be unchanged while the consistency is changed.
  • the return flow is effected via a line 13′ back to a point prior to the pump 3, in this case upstream of the dilution control valve 300, but in any case to a point upstream of the consistency and flow control which determined the fiber flow supplied to the suction side of the pump 4. Controlling the liquid flow to the headbox 8 by means of the valve 130 does not effect the consistency of the suspension supply.
  • control measures within the scope of the invention to vary for example the degree of thickening in the system.
  • a single main pump 4 pumps the diluted suspension to the units 6 and 7 coupled in series and then to the headbox 8.
  • the pressure drop between the inlet and the base in a A-cyclone is 1 bar and the pressure drop in a B-cyclone between the inlet and the apex is 1.5 bar. These pressure drops are essentially a function of the flow.
  • the pump 4 is dimensioned so that it can both compensate these pressure drops and produce sufficient pressure to the headbox 8.
  • Control of the valves 800 and 130 must be done in such a manner that the operating conditions for the multi-hydrocyclone units are not affected negatively.
  • the main pump 4 is a centrifugal pump, driven at essentially constant rotational speed, with falling pressure head as flow increases.
  • the system is designed so that at the rated flow the pressure head is sufficient for the pressure drops in the multi-hydrocyclone units 6 and 7 and the valve 800 at a normal work point, and controlling within reasonable limits of the flow through the valve 800 to keep the pressure or the level in the headbox 8 does not involve any appreciable disruption.
  • Major changes in the pressure drop over the valve 800 cannot be tolerated, however, since the working conditions for the units 6 and 7 would be adversely affected.
  • the shunt valve 130 In order to make significant changes in the feed flow to the box 8, there must therefore be a diversion via the shunt valve 130 so that the pressure on the suspension can be kept reasonably constant.
  • the shunt valve 130 can then either be controlled manually with reference to a manometer or can be pressure controlled in the manner shown in the drawing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Silicon Compounds (AREA)
  • Materials For Medical Uses (AREA)
  • Magnetic Record Carriers (AREA)
  • Bakery Products And Manufacturing Methods Therefor (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
EP89850341A 1989-10-10 1989-10-10 A method and device for the production of cellulose pulp of improved quality Expired - Lifetime EP0422314B1 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
DE198989850341T DE422314T1 (de) 1989-10-10 1989-10-10 Verfahren und vorrichtung zur herstellung eines cellulosebreis von verbesserter qualitaet.
DE68914666T DE68914666T2 (de) 1989-10-10 1989-10-10 Verfahren und Vorrichtung zur Herstellung eines Cellulosebreis von verbesserter Qualität.
AT89850341T ATE104382T1 (de) 1989-10-10 1989-10-10 Verfahren und vorrichtung zur herstellung eines cellulosebreis von verbesserter qualitaet.
ES89850341T ES2023626T3 (es) 1989-10-10 1989-10-10 Metodo y dispositivo para la produccion de pulpa de celulosa de calidad mejorada.
EP89850341A EP0422314B1 (en) 1989-10-10 1989-10-10 A method and device for the production of cellulose pulp of improved quality
DD90343169A DD296722A5 (de) 1989-10-10 1990-07-31 Verfahren und vorrichtung zur erzeugung von zellulosebrei mit verbeserter qualitaet
JP3500294A JPH0781240B2 (ja) 1989-10-10 1990-10-09 改良された品質のセルロースパルプの製造の方法及び装置
BR909006945A BR9006945A (pt) 1989-10-10 1990-10-09 Processo e aparelho para fabricacao de polpa de celulose com propriedades de qualidade aperfeicoadas
PCT/SE1990/000648 WO1991005912A1 (en) 1989-10-10 1990-10-09 A method and device for the production of cellulose pulp of improved quality
CA002042366A CA2042366C (en) 1989-10-10 1990-10-09 Method and device for the production of cellulose pulp of improved quality
NO912197A NO178348C (no) 1989-10-10 1991-06-07 Fremgangsmåte og anordning for fremstilling av cellulosemasse med forbedrede kvalitetsegenskaper

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP89850341A EP0422314B1 (en) 1989-10-10 1989-10-10 A method and device for the production of cellulose pulp of improved quality

Publications (2)

Publication Number Publication Date
EP0422314A1 EP0422314A1 (en) 1991-04-17
EP0422314B1 true EP0422314B1 (en) 1994-04-13

Family

ID=8203268

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89850341A Expired - Lifetime EP0422314B1 (en) 1989-10-10 1989-10-10 A method and device for the production of cellulose pulp of improved quality

Country Status (10)

Country Link
EP (1) EP0422314B1 (no)
JP (1) JPH0781240B2 (no)
AT (1) ATE104382T1 (no)
BR (1) BR9006945A (no)
CA (1) CA2042366C (no)
DD (1) DD296722A5 (no)
DE (2) DE422314T1 (no)
ES (1) ES2023626T3 (no)
NO (1) NO178348C (no)
WO (1) WO1991005912A1 (no)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9317817D0 (en) * 1993-08-27 1993-10-13 Wiggins Teape Group The Ltd Papermaking process and apparatus for use therewith
DE19522761C2 (de) * 1995-06-27 2000-11-16 Voith Sulzer Papiermasch Gmbh Schuh-Preßeinrichtung
SE507387C2 (sv) * 1996-09-16 1998-05-25 Alfa Laval Ab Förfarande och anläggning för behandling av en förorenad massasuspension
SE507386C2 (sv) * 1996-09-16 1998-05-25 Alfa Laval Ab Förfarande och anläggning för behandling av en förorenad massasuspension
FI103734B (fi) * 1997-11-11 1999-08-31 Ahlstrom Machinery Oy Menetelmä ja laitteisto kuitususpension käsittelemiseksi
FI112806B (fi) * 2001-03-09 2004-01-15 Metso Paper Inc Menetelmä kuitumassan laadun ohjaamiseksi
FI110699B (fi) * 2001-08-15 2003-03-14 Metso Paper Inc Paperikoneen tai vastaavan perälaatikko
DE10358567A1 (de) * 2003-12-15 2005-09-08 Nordland Papier Gmbh Verfahren und Vorrichtung zur Behandlung eines Faserstoffs
RU2708110C1 (ru) * 2019-04-09 2019-12-04 Николай Васильевич Байкин Устройство сортирования волокнистых материалов
CN110409212B (zh) * 2019-07-19 2021-09-03 王洲 一种三明治式的擦手纸及其生产工艺

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3912579A (en) * 1969-06-04 1975-10-14 Bergstrom Paper Co Reverse cleaning and de-inking of paper stock
USRE29472E (en) * 1971-09-29 1977-11-15 Clark & Vicario Corporation Conduit system for conveying fibrous stock from deaerator chamber to headbox in papermaking machine
US4312701A (en) * 1980-11-07 1982-01-26 Hydro-Thermal Corporation Method for defibrating waste paper and dispersing contaminants
US4437984A (en) * 1982-04-05 1984-03-20 Clark & Vicario Corporation Multiple hydrocyclone apparatus
SE435581B (sv) * 1982-08-16 1984-10-08 Celleco Ab Forfarande for uppdelning av en blandning av en relativt tyngre fibersuspension (accept) och letta fororeningar (reject)
SE451736B (sv) * 1983-09-19 1987-10-26 Nils Anders Lennart Wikdahl Sett vid urvattning av en vattenhaltig suspension innehallande cellulosafibrer
US4738779A (en) * 1984-11-28 1988-04-19 Noel Carroll Cyclone separator
SU1376325A1 (ru) * 1986-07-10 1990-08-23 Научно-производственное объединение по крахмалопродуктам Многоступенчата мультициклонна установка

Also Published As

Publication number Publication date
JPH04502188A (ja) 1992-04-16
DE68914666T2 (de) 1994-08-18
CA2042366C (en) 1995-07-04
DE422314T1 (de) 1991-07-25
NO912197D0 (no) 1991-06-07
EP0422314A1 (en) 1991-04-17
DE68914666D1 (de) 1994-05-19
ES2023626A4 (es) 1992-02-01
NO178348C (no) 2001-03-05
JPH0781240B2 (ja) 1995-08-30
NO912197L (no) 1991-06-07
DD296722A5 (de) 1991-12-12
ATE104382T1 (de) 1994-04-15
NO178348B (no) 1995-11-27
BR9006945A (pt) 1991-10-08
WO1991005912A1 (en) 1991-05-02
ES2023626T3 (es) 1994-07-01
CA2042366A1 (en) 1991-04-11

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