EP1767690A2 - Procédé pour la régulation de systèmes de triage et système de triage pour l'application du procédé - Google Patents

Procédé pour la régulation de systèmes de triage et système de triage pour l'application du procédé Download PDF

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Publication number
EP1767690A2
EP1767690A2 EP07000198A EP07000198A EP1767690A2 EP 1767690 A2 EP1767690 A2 EP 1767690A2 EP 07000198 A EP07000198 A EP 07000198A EP 07000198 A EP07000198 A EP 07000198A EP 1767690 A2 EP1767690 A2 EP 1767690A2
Authority
EP
European Patent Office
Prior art keywords
sorter
sorting system
sorting
fraction
fine fraction
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.)
Withdrawn
Application number
EP07000198A
Other languages
German (de)
English (en)
Other versions
EP1767690A3 (fr
Inventor
Samuel Dr. Schabel
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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 Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1767690A2 publication Critical patent/EP1767690A2/fr
Publication of EP1767690A3 publication Critical patent/EP1767690A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0018—Paper-making control systems controlling the stock preparation
    • 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

Definitions

  • the invention relates to a method for controlling in particular multi-stage sorting systems in paper production according to the preamble of claim 1 and a sorting system suitable for carrying out this method.
  • Sorting systems for paper production serve to divide a pulp suspension into at least two fractions, namely a so-called fine fraction and a so-called coarse fraction.
  • the fine fraction consists of a large part of the water contained in the pulp suspension and as many paper fibers, while the coarse fraction, i. the fraction which can not pass through the screens used in the respective sorters of the sorting system, should contain as few fibers as possible and as far as possible all interfering impurities.
  • the highest possible purity of the final fine fraction the lowest possible fiber loss, i. minimum fiber content in the coarse fraction, as well as the largest possible production amount sought, which is understood under production or production volume, the amount of accepts received.
  • a particular problem associated with the achievement of this objective stems mainly from fluctuations in the quality of raw materials, which can be negatively caused by larger volumes of advertising leaflets in newspapers, and in a positive sense by falling commodity prices, which encourages the processing of materials lead to an above-average quality of raw materials.
  • These issues make it difficult to control sorting systems of a known type such that a certain target size, such as e.g. Efficiency or minimum fiber loss is achieved.
  • the object of the invention is to optimize a method of the type indicated in the preamble of claim 1 in such a way that, on the one hand, the abovementioned objectives of a good sorting method can be achieved in the best possible way and, on the other hand, predefinable target variables, e.g. Efficiency and fiber loss can be specified and fluctuations in the quality of the raw materials can be taken into account.
  • predefinable target variables e.g. Efficiency and fiber loss can be specified and fluctuations in the quality of the raw materials can be taken into account.
  • the sorting system can be modeled by a linear system of equations, in which case this model, by implementing a state controller, is used according to the invention to drive the system in the optimum operating state.
  • Fig. 1 shows an example of how certain selectable parameters of sorters affect the purity of the fine fraction or the accept.
  • the overflow parameter refers to the amount of reject that can be set during operation of the sorter, measured volumetrically here.
  • the slot width refers to the strainer of the sorter used.
  • Profile angle is the angle at which the top edge of a screen is inclined relative to the circumference. A large profile angle corresponds to a relatively strong turbulence in the inlet region of the slotted screen, which means on the one hand a higher throughput, but on the other hand, a lower purity of the accept.
  • the slot speed refers to the suspension as it passes through the slot. It results essentially from the entire slot area and from the volume flow pumped through the sorting machine.
  • the speed is the speed of the rotor of a sorter, which is provided for Siebzynnen and preferably can be operated at different speeds.
  • Fig. 2 shows a diagram of an embodiment of the invention performing, three-stage sorting system.
  • the parameters that can be influenced during operation have overflow quantity and slot speed a considerable influence on the system efficiency.
  • Such correlations are decisive for the fact that the sorting system can be mathematically modeled by a linear system of equations and, using such a model in a state controller, the respective system can be driven in the desired optimum operating state.
  • the sorting system shown as an example in FIG. 2 has a three-stage design and is regulated by a state controller 25 during operation.
  • the plant comprises a first sorter 1, in which a sieve 2 is located.
  • the screen contains a multiplicity of openings, which are designed in such a way that part of the inflowing pulp suspension S as fine fraction F can pass through the openings, while a coarse fraction G is rejected.
  • the feed of the suspension S takes place via a pump 24.
  • a flow sensor 7 and a control valve 8 are arranged, and a corresponding flow sensor 6 and a corresponding control valve 4 are provided in the output line for the coarse fraction ,
  • the flow sensors 6, 7 deliver their signals to the state controller 25, while the control valves 4, 8 receive their control signals from the state controller 25.
  • the coarse fraction G of the first sorter 1 is fed via a collecting unit 3 and a pump 24 to a second sorter 9 with a sieve 10. Also in this sorter 9, a flow sensor 13 and a control valve 14 are disposed in the fine fraction outlet line, and a flow sensor 11 and a control valve 12 are provided in the coarse flow outlet line, the sensors in turn providing their signals to the state controller 25 and the control valves 12, 14 are controlled by the state controller 25.
  • the coarse fraction of the second sorter 9 passes through a collection unit 3 and a pump 24 to a third sorter 15 having a separation screen 16.
  • this third sorter 15 that both in the output line for the fine fraction and in the output line for the coarse fraction each have a flow sensor 20 and 17 and a control valve 21 and 18 are provided, again in an analogous manner to the previous sorters the flow sensors provide their measurement signals to the state controller 25, while the control valves 21 and 18 of this State controller 25 are controlled or regulated.
  • the fine fraction of the third sorter 15 is fed via the collecting unit 3 and the pump 24 to the second sorter 9, which also receives the coarse fraction of the first sorter via the collecting unit 3.
  • the target variable efficiency or acceptable quality can also be detected via an online quality sensor 5, whose output signals are fed to the state controller 25 for further processing. But this is not mandatory. Meaningful regulation or control is also possible because the operator specifies qualitatively whether he wants to drive a higher quality or a higher production.
  • a development of the invention is characterized in that at least for the first sorter 1 a return flow RC is provided.
  • This return is branched off from the fine fraction F before the flow sensor 7 and fed to the inlet line for the suspension S, the return expediently before the feed pump 24 opens.
  • a flow sensor 22 and a control valve 23 are arranged in the return line RC, wherein the sensor 22 delivers its signals to the state controller 25 and the control valve 23 is controlled or regulated by the state controller 25.
  • the return flow of the fine fraction can be incorporated as an additional operating parameter in the control concept.
  • the advantage that can be achieved in this case is that this additional operating parameter has a significant influence on the sorting efficiency, but only a small influence on the other operating parameters.
  • Fig. 3 shows a particularly preferred embodiment of the invention, which differs from the embodiment of FIG. 2 in that the return RC is not provided on the first sorter, but rather on the second sorter 9 of the system shown.
  • this feedback RC is analogous to the embodiment of FIG. 2, a flow sensor 22 'and a control valve 23' is provided, the flow sensor 22 'provides its output signals to the state controller 25, while the control valve 23' its control or control signals from State controller 25 receives.
  • the use of a return RC in a higher level of the overall arrangement, as in the embodiment of FIG. 3 in connection with the stage 9, is therefore particularly advantageous because in these stages, the pollution load is already greater and thus the return can develop the best possible effectiveness.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Sorting Of Articles (AREA)
  • Discharge Of Articles From Conveyors (AREA)
  • Branching, Merging, And Special Transfer Between Conveyors (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
EP07000198A 2001-12-10 2002-11-04 Procédé pour la régulation de systèmes de triage et système de triage pour l'application du procédé Withdrawn EP1767690A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10160603A DE10160603A1 (de) 2001-12-10 2001-12-10 Verfahren zur Regelung von Sortiersystemen sowie zur Durchführung dieses Verfahrens geeignetes Sortiersystem
EP02024605A EP1318229B1 (fr) 2001-12-10 2002-11-04 Procédé pour la régulation de systèmes de triage et système de triage pour l'application du procédé

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP02024605A Division EP1318229B1 (fr) 2001-12-10 2002-11-04 Procédé pour la régulation de systèmes de triage et système de triage pour l'application du procédé

Publications (2)

Publication Number Publication Date
EP1767690A2 true EP1767690A2 (fr) 2007-03-28
EP1767690A3 EP1767690A3 (fr) 2007-10-24

Family

ID=7708666

Family Applications (2)

Application Number Title Priority Date Filing Date
EP02024605A Expired - Lifetime EP1318229B1 (fr) 2001-12-10 2002-11-04 Procédé pour la régulation de systèmes de triage et système de triage pour l'application du procédé
EP07000198A Withdrawn EP1767690A3 (fr) 2001-12-10 2002-11-04 Procédé pour la régulation de systèmes de triage et système de triage pour l'application du procédé

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP02024605A Expired - Lifetime EP1318229B1 (fr) 2001-12-10 2002-11-04 Procédé pour la régulation de systèmes de triage et système de triage pour l'application du procédé

Country Status (6)

Country Link
US (1) US7083049B2 (fr)
EP (2) EP1318229B1 (fr)
JP (1) JP2003239186A (fr)
AT (1) ATE358742T1 (fr)
CA (1) CA2413486A1 (fr)
DE (2) DE10160603A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11193238B2 (en) * 2016-08-31 2021-12-07 Seiko Epson Corporation Sheet manufacturing apparatus and control method for sheet manufacturing apparatus
US11384482B2 (en) * 2018-11-07 2022-07-12 Seiko Epson Corporation Web manufacturing apparatus and sheet manufacturing apparatus

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10350073A1 (de) * 2003-10-27 2005-06-09 Siemens Ag Verfahren zur Weißeregelung für die Druckfarbenentfernung in Deinking-Anlagen und eine Deinking-Anlage mit einer Flotationszelle zur Druckfarbenentfernung
AT501723B1 (de) * 2005-06-16 2006-11-15 Andritz Ag Maschf Verfahren zum entfernen von verunreinigungen aus faserstoffsuspensionen
DE102008013034B3 (de) 2008-03-07 2009-09-17 Technische Universität Darmstadt Verfahren zum Einstellen und/oder Optimieren einer einen Gutstoff von einem Schlechtstoff trennenden Sortieranlage und Sortieranlage
US11214925B2 (en) 2015-08-21 2022-01-04 Pulmac Systems International, Inc. Method of preparing recycled cellulosic fibers to improve paper production
US10941520B2 (en) 2015-08-21 2021-03-09 Pulmac Systems International, Inc. Fractionating and refining system for engineering fibers to improve paper production
US10041209B1 (en) 2015-08-21 2018-08-07 Pulmac Systems International, Inc. System for engineering fibers to improve paper production
DE102019125317A1 (de) * 2019-09-20 2021-03-25 Voith Patent Gmbh Reinigungsverfahren
BR112022009347A2 (pt) * 2019-11-14 2022-08-09 Buckman Laboratories Int Inc Método implementado por computador e sistema para controle preditivo de tratamento de pasta crua em uma fábrica de celulose

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997032078A1 (fr) 1996-02-29 1997-09-04 Alfa Laval Ab Processus et appareil permettant de gerer la purification et la production de fibres a partir d'une suspension de fibres
WO2001059206A1 (fr) 2000-02-11 2001-08-16 Metso Paper Inc Procede de controle de qualite de la pate de bois

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US3110172A (en) * 1961-03-06 1963-11-12 Process & Steam Specialties In Consistancy and freeness measuring and regulating apparatus for thin stock pulp and paper
US3873416A (en) * 1970-11-27 1975-03-25 Alkibiadis Karnis System for the continuous measurement of the weight-average fiber length of a pulp
US3886035A (en) * 1973-03-12 1975-05-27 Kamyr Inc Process for separating knots from pulp
US4342618A (en) * 1979-05-14 1982-08-03 Alkibiadis Karnis Method and apparatus on-line monitoring of fibre length of mechanical pumps
SE8106985L (sv) * 1981-11-24 1983-05-25 Nils Anders Lennart Wikdahl Sett att forhindra igensettning av ett silorgan vid silning av en fibersuspension
DE3241876A1 (de) * 1982-11-12 1984-05-17 J.M. Voith Gmbh, 7920 Heidenheim Einrichtung zur fraktionierung von fasersuspension
SE470315B (sv) * 1992-06-05 1994-01-17 Sunds Defibrator Ind Ab Sätt att styra silningsprocessen vid silning av cellulosahaltiga massasuspensioner
US6080274A (en) * 1997-05-06 2000-06-27 Valmet Corporation Method for controlling a multi-phase screening apparatus
DE19802493C1 (de) * 1998-01-23 1999-10-14 Voith Sulzer Papiertech Patent Verfahren zur Entfernung von Verunreinigungen aus einer Altpapier-Faserstoffsuspension
DE19806734A1 (de) 1998-01-23 1998-09-17 Voith Sulzer Papiertech Patent Verfahren zur Entfernung von Störstoffen aus einer Papierfasersuspension mit Hilfe der Flotation
DE19819110A1 (de) * 1998-04-29 1999-11-04 Voith Sulzer Papiertech Patent Verfahren zum Sortieren einer Faserstoffsuspension
DE19910910A1 (de) 1999-03-11 2000-09-28 Voith Sulzer Papiertech Patent Verfahren zur Durchführung eines optimierten Faser- oder Papierherstellungsprozesses
FI112806B (fi) * 2001-03-09 2004-01-15 Metso Paper Inc Menetelmä kuitumassan laadun ohjaamiseksi

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997032078A1 (fr) 1996-02-29 1997-09-04 Alfa Laval Ab Processus et appareil permettant de gerer la purification et la production de fibres a partir d'une suspension de fibres
WO2001059206A1 (fr) 2000-02-11 2001-08-16 Metso Paper Inc Procede de controle de qualite de la pate de bois

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11193238B2 (en) * 2016-08-31 2021-12-07 Seiko Epson Corporation Sheet manufacturing apparatus and control method for sheet manufacturing apparatus
US11384482B2 (en) * 2018-11-07 2022-07-12 Seiko Epson Corporation Web manufacturing apparatus and sheet manufacturing apparatus

Also Published As

Publication number Publication date
EP1767690A3 (fr) 2007-10-24
ATE358742T1 (de) 2007-04-15
DE50209858D1 (de) 2007-05-16
EP1318229A1 (fr) 2003-06-11
US20030116661A1 (en) 2003-06-26
CA2413486A1 (fr) 2003-06-10
DE10160603A1 (de) 2003-06-26
JP2003239186A (ja) 2003-08-27
US7083049B2 (en) 2006-08-01
EP1318229B1 (fr) 2007-04-04

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