WO2022069433A1 - Commande du traitement d'un matériau fibreux - Google Patents

Commande du traitement d'un matériau fibreux Download PDF

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Publication number
WO2022069433A1
WO2022069433A1 PCT/EP2021/076575 EP2021076575W WO2022069433A1 WO 2022069433 A1 WO2022069433 A1 WO 2022069433A1 EP 2021076575 W EP2021076575 W EP 2021076575W WO 2022069433 A1 WO2022069433 A1 WO 2022069433A1
Authority
WO
WIPO (PCT)
Prior art keywords
treatment
distance
gap
value
total power
Prior art date
Application number
PCT/EP2021/076575
Other languages
German (de)
English (en)
Inventor
Martin Kemper
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
Priority to EP21786124.4A priority Critical patent/EP4222308A1/fr
Priority to CN202180066903.8A priority patent/CN116324083A/zh
Publication of WO2022069433A1 publication Critical patent/WO2022069433A1/fr
Priority to US18/127,770 priority patent/US20230243097A1/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/002—Control devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/14—Disintegrating in mills
    • 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

Definitions

  • the invention relates to a method for controlling a device for treating fibrous material, the device having a housing in which at least a first treatment tool and a second treatment tool are arranged.
  • the treatment tools are each mounted on a base plate and have a rotationally symmetrical shape and are arranged coaxially with one another and rotate relative to one another about a common axis.
  • the treatment tools delimit a treatment gap through which the fibrous material flows and each have a treatment profile pointing towards the treatment gap, with at least one base plate of a treatment tool being mounted in an axially displaceable manner to compensate for the wear of the treatment profiles.
  • the width of the treatment gap is adjusted until the predetermined total power is reached.
  • Devices of the above kind become e.g. B. used to improve the quality of pulp, TMP or pulp that was obtained from waste paper.
  • the grinding surfaces are formed by replaceable grinding sets screwed to the corresponding base plate.
  • the beating clothing In order to achieve the desired fiber properties, in particular the degree of beating, the beating clothing must be optimally adapted to the fibrous material to be treated, also in order to prevent excessive wear of the clothing.
  • a constant overall performance is regulated by an axial displacement of the axially displaceable base plate.
  • the object of the invention is to enable safe and efficient operation of these devices with the simplest possible means.
  • the object is achieved in that the distance between the base plates of the treatment tools of a treatment gap is changed during operation of the device for controlling the total power, and the value of the total power is selected as a function of the measured distance between the base plates of the treatment gap.
  • the measured distance is also understood to mean, in particular, a change in distance starting from an initial value.
  • the distance can be measured directly by measuring the distance, for example, between the treatment tools or the base plates on which the treatment tools are attached.
  • the distance can also be measured indirectly.
  • the position of the drive for tracking the axially displaceable base plate of the treatment tool can be inferred from the change in distance.
  • the total power which is made up of the no-load or pump power and the specific power relevant to the desired treatment intensity, must be adjusted accordingly. In this way, an unwanted increase in the specific power and thus also the intensity of the treatment of the fibers can be effectively and easily counteracted.
  • the usual width of the treatment gap is many times smaller than the profile height of the treatment tools and so the width of the treatment gap can be neglected in the control.
  • a treatment gap is formed during operation and a treatment gap width is set until a predetermined overall output is reached. Since the gap width of the treatment gap is negligible compared to the profile height, the variation in the gap width of the treatment gap is thus also the treatment gap width also dependent on the throughput can be negligible compared to the change in position due to wear of the clothing.
  • the profile height can thus be determined from the measured distance/distance change, or a change in the profile height based on an initial value.
  • the profile height corresponds to half the distance between the base plates and in a device with two treatment gaps, the profile height after deducting the width of the distances caused by non-profile components is a quarter of the determined distance value.
  • the reduction in the distance can also be determined by measurement and the reduction in the profile heights can be determined directly from this.
  • the corresponding overall performance is set.
  • the wear of each set should be indicated rounded to 0.1 mm, preferably rounded to 0.5 mm.
  • a displacement sensor or an incremental encoder can be used as sensors for determining the position or the change in position.
  • the value of the total power should be chosen solely as a function of the measured distance between the base plates of the treatment gap or in connection with the desired grinding energy.
  • the measured distance corresponds to the determination of the profile height.
  • the relationships between the profile height and the idle power associated with it are preferably stored in a characteristic map. This characteristic map can be read in by the operator before it is put into operation or it can also be made available by the manufacturer of the device. This means that it is not necessary to determine the no-load power during operation.
  • the rotor is mounted in a floating manner in a device with a double gap. This allows an adjustment of the distance between the treatment tools corresponding to the Height of the profiles for both gaps is carried out by an axially displaceable treatment tool.
  • a more precise control is possible if the value of the total output is selected taking into account other values such as flow and consistency and/or the quality of the pulp suspension.
  • the value of the total power should be adjusted at least when a change in the distance between the base plates of the treatment gap of at least 1 mm is detected. This corresponds to a reduction of each treatment profile of 0.5 mm at a treatment gap.
  • the value of the total power is reselected at predetermined time intervals at most once a day, preferably at least once a week, depending on the measured change in the distance between the base plates of the treatment gap. Between these time intervals, the distance between the base plates is reduced according to the wear of the treatment profile in order to keep the total output constant at the current value.
  • the no-load power which relates to the throughput of fibrous material per unit of time and is usually between 40 and 250, in particular between 40 and 150, kWh per ton of dry weight in refiners, should also be included if possible.
  • a distance value measured when opening and/or closing the treatment gap can be used once as a new output value for no-load power for establishing a reference to an interleaved characteristic map.
  • further links with other parameter values can be used to control the overall performance and thus also the specific performance of the device.
  • a determination of the no-load power is determined only after a predetermined minimum operating time. This prevents the no-load power being determined every time the device is stopped several times a day. An idle determination every 1 to 2 weeks is completely sufficient due to the stored maps and a corresponding tracking of the overall performance. As a result, an undesirably high grinding capacity can be reliably prevented.
  • the value of the total power for controlling the device should be selected in such a way that the specific power of the device relevant to the desired treatment intensity, which results from the difference between the total power and the no-load power, is constant over the operating period. This ensures a constant treatment intensity will.
  • the specific power is regarded as constant if the specific power deviates by less than 5% from its arithmetic mean.
  • the length of these time intervals must be selected in such a way that possible changes due to wear of the processing profile with regard to the then increasing specific power are tolerable.
  • a change of less than 5% of the last assumed idle power and/or a change in position of less than 1 mm per gap is considered to be tolerable.
  • values stored in a memory of the controller should advantageously be used.
  • the stored values or the map were specified by the manufacturer of the device or determined in advance by the operator of the device in tests.
  • one treatment tool should rotate and the other should not, with at least one treatment tool being mounted so that it can be displaced axially.
  • the treatment tool and base plate can also be made in one piece. It is also possible for the housing to have several, in particular two parallel, treatment gaps arranged next to one another, each with a treatment tool rotating on a shaft and a non-rotating treatment tool. As a rule, the two treatment tools adjacent to the other treatment gap are attached to a common base plate, this common base plate and at least one of the treatment tools not attached to this base plate being mounted so as to be axially displaceable.
  • the fibrous material can in particular also be TMP, high-yield cellulose, MDF fibrous material, wood chips or similar substances.
  • Figure 1 a schematic cross section through a refiner
  • Figure 2 the change in no-load power PL and the adjustment of the total power PG over time t and over the distance s between the base plates 7.8.
  • the paper pulp 1 is pressed directly into the central, i.e. radially inner area of the refiner clothing, which is formed by the two treatment tools 3,4.
  • the treatment tools 3.4 each have a rotationally symmetrical shape, with the two annular grinding surfaces being arranged parallel to one another.
  • the treatment gap 6 between the grinding surfaces is adjusted via an axial displacement in order to achieve a predetermined overall performance.
  • the treatment intensity of the paper pulp 1 flowing into the gap also referred to as fiber suspension, is determined by the gap width of the treatment gap 6 .
  • the axial extent of this gap width of the treatment gap 6 is negligible in comparison with the height of the treatment profiles 9 of the treatment tools 3 , 4 .
  • the rotating grinding surface 9 is here moved in the direction of rotation by a shaft rotatably mounted in the housing 2 .
  • This shaft is driven by a drive that is also present in the housing 2 .
  • the fiber suspension 1 to be ground passes via an inlet through the center into the treatment gap 6 between the grinding surfaces of the two treatment tools 3,4.
  • the fiber suspension 1 passes the interacting beating surfaces radially outwards and leaves the adjoining annular space through an outlet.
  • Both grinding surfaces are each formed by a plurality of grinding plates, each of which extends over a peripheral segment of the corresponding grinding surface. Arranged side by side in the circumferential direction, the grinding plates form a continuous grinding surface.
  • the refining plates and thus also the refining surfaces have a treatment profile 9 directed towards the treatment gap 6, which is generally formed by a multiplicity of essentially radially running grinding bars and grooves in between.
  • the means known per se, with which the non-rotating treatment tool 3 is displaced axially, are not shown.
  • the extent of this axial displacement is measured by a displacement sensor 10.
  • the rotating treatment tool 4 does not change its axial position. It can also be measured by means of an incremental encoder on the drive for setting the axial position of the non-rotating but axially displaceable treatment tool 3 (not shown).
  • the treatment tools 3.4 are attached to corresponding base plates 7.8.
  • the treatment gap 6 can run not only perpendicular but also inclined to the axis of rotation 5, as in the case of cone refiners.
  • the housing 2 can also include several, in particular two, treatment gaps 6 .
  • FIG. 2 illustrates the change in the real no-load power PL of the refiner over the distance S, which decreases with increasing operating time t and thus also with increasing wear of the treatment profile 9 of the treatment tools 3, 4.
  • the total power PG which is supplied to the treatment device, is made up of the no-load power PL and the specific power Ps responsible for the treatment intensity of the fibrous material 1, i.e. the beating power.
  • the total power is set to a predetermined value that corresponds to the desired treatment intensity with a known idle power.
  • the assumed no-load power PL depends on the measured distance s between the base plates 7 , 8 or the distance between the treatment tools 3, 4 is adjusted accordingly with recourse to the stored values or the stored characteristics map.
  • the value of the total power PG is preferably chosen such that the specific power Ps of the device, which is relevant for the desired treatment intensity, is as constant as possible over the operating time.
  • values stored in a memory of the controller are used, which are specified by the manufacturer of the device or determined by the operator of the device in tests.
  • the value of the total power PG specified for the control of the device can be continuously adapted to the distance s between the base plates 7, 8 of the treatment gap 6, as shown in FIG. 2 as a dashed line.
  • the total power PG in FIG. 2 it is also possible to readjust the value of the total power PG to the distance s between the base plates 7.8 of the treatment gap 6 at specific time intervals.
  • the total power is adjusted as a function of the change s. The adaptation is based on the no-load power assigned to the distance s.
  • the specified value of the total power PG remains constant between the respective adjustments.
  • the slight increase in the specific power Ps that has occurred in the meantime can be tolerated.
  • the value of the no-load power PL relevant for the control of the treatment device is updated via the measured distance.
  • a no-load power PL is verified when fibrous material 1 is present during an opening and/or closing of the treatment gap 6 with normal operating parameters such as pressure, flow rate and consistency. This verification can be scheduled every 1-2 weeks up to once a day.
  • the no-load power PL of the treatment device is measured when the treatment gap is opened and/or closed, and it is checked whether the assumed value of the no-load power PL matches the measured value.
  • a malfunction in the distance measurement can also be reliably detected if the measured value of the no-load power deviates significantly from the value stored for the respective distance.
  • the no-load power PL is measured when the treatment gap 6 is closed and stored in the memory as a starting value for the controller.
  • the knowledge of the at least approximately real no-load power PL not only has an influence on the specific power and the corresponding total power to be adjusted, but if a specified, minimum no-load power PL is not reached, a correspondingly high level of wear on the treatment tools 3.4 can be concluded, which makes change necessary. Provision can also be made for informing the user if the distance falls below a predetermined value, so that the user can plan and prepare for an soon-to-be-needed replacement of the grinding sets.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un procédé de commande d'un dispositif de traitement de matériau fibreux (1), ledit dispositif comprenant un boîtier (2), dans lequel sont agencés un premier outil de traitement (3) et un second outil de traitement (4), dans chaque cas, les outils de traitement (3, 4) étant fixés à une plaque de base (7, 8), revêtant une forme symétrique en rotation, étant agencés coaxialement l'un par rapport à l'autre, étant en rotation l'un par rapport à l'autre autour d'un axe commun (5), délimitant une ligne de contact de traitement (6) à travers laquelle s'écoule le matériau fibreux (1) et présentant dans chaque cas un profilé de traitement (9) qui pointe vers la ligne de contact de traitement (6), au moins une plaque de base (7, 8) d'un outil de traitement (3, 4) étant montée déplaçable axialement pour compenser l'usure des profilés de traitement (9). La commande du dispositif doit être améliorée en ce que la ou les distances entre les plaques de base (7, 8) des outils de traitement (3, 4) d'une ligne de contact de traitement (6) sont déterminées et, dans le but de réguler la puissance totale (PG), la valeur de la puissance totale (PG) est réglée en fonction d'un changement de distance(s) entre les plaques de base (7, 8) de la ligne de contact de traitement (6).
PCT/EP2021/076575 2020-09-30 2021-09-28 Commande du traitement d'un matériau fibreux WO2022069433A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP21786124.4A EP4222308A1 (fr) 2020-09-30 2021-09-28 Commande du traitement d'un matériau fibreux
CN202180066903.8A CN116324083A (zh) 2020-09-30 2021-09-28 纤维材料处理的控制
US18/127,770 US20230243097A1 (en) 2020-09-30 2023-03-29 Controlling the treatment of fibrous material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020125487 2020-09-30
DE102020125487.3 2020-09-30

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US18/127,770 Continuation US20230243097A1 (en) 2020-09-30 2023-03-29 Controlling the treatment of fibrous material

Publications (1)

Publication Number Publication Date
WO2022069433A1 true WO2022069433A1 (fr) 2022-04-07

Family

ID=78073905

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2021/076575 WO2022069433A1 (fr) 2020-09-30 2021-09-28 Commande du traitement d'un matériau fibreux

Country Status (5)

Country Link
US (1) US20230243097A1 (fr)
EP (1) EP4222308A1 (fr)
CN (1) CN116324083A (fr)
DE (1) DE102021125006A1 (fr)
WO (1) WO2022069433A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2612065A1 (de) * 1975-04-07 1976-10-28 Defibrator Ab Vorrichtung zum verhindern metallischer beruehrung und zum bestimmen und regeln des abstandes zwischen mahlgliedern
DE2939587A1 (de) 1978-10-06 1980-04-17 Beloit Corp Programmierbare refiner-steuerung fuer die papierherstellung
DE3602833A1 (de) 1985-01-31 1986-08-07 Beloit Corp Regelverfahren und -anordnung fuer einen papierherstellungsrefiner
US5500088A (en) * 1993-08-25 1996-03-19 Macmillan Bloedel Limited Automatic refiner load control
US5691636A (en) * 1993-08-25 1997-11-25 Andritz Sprout-Bauer, Inc. Probe assembly mounting for a grinding machine
US20040112997A1 (en) 2001-03-12 2004-06-17 Matthew John B. Method of diagnosing and controlling a grinding mill for paper and the like
DE102016207726A1 (de) 2016-05-04 2017-11-09 Voith Patent Gmbh Steuerung der Faserstoffbehandlung

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2612065A1 (de) * 1975-04-07 1976-10-28 Defibrator Ab Vorrichtung zum verhindern metallischer beruehrung und zum bestimmen und regeln des abstandes zwischen mahlgliedern
DE2939587A1 (de) 1978-10-06 1980-04-17 Beloit Corp Programmierbare refiner-steuerung fuer die papierherstellung
DE3602833A1 (de) 1985-01-31 1986-08-07 Beloit Corp Regelverfahren und -anordnung fuer einen papierherstellungsrefiner
US5500088A (en) * 1993-08-25 1996-03-19 Macmillan Bloedel Limited Automatic refiner load control
US5691636A (en) * 1993-08-25 1997-11-25 Andritz Sprout-Bauer, Inc. Probe assembly mounting for a grinding machine
US20040112997A1 (en) 2001-03-12 2004-06-17 Matthew John B. Method of diagnosing and controlling a grinding mill for paper and the like
DE102016207726A1 (de) 2016-05-04 2017-11-09 Voith Patent Gmbh Steuerung der Faserstoffbehandlung

Also Published As

Publication number Publication date
EP4222308A1 (fr) 2023-08-09
US20230243097A1 (en) 2023-08-03
CN116324083A (zh) 2023-06-23
DE102021125006A1 (de) 2022-03-31

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