EP4399366A1 - Procédé et dispositif destinés à améliorer le processus de séchage dans une machine à papier - Google Patents

Procédé et dispositif destinés à améliorer le processus de séchage dans une machine à papier

Info

Publication number
EP4399366A1
EP4399366A1 EP22772940.7A EP22772940A EP4399366A1 EP 4399366 A1 EP4399366 A1 EP 4399366A1 EP 22772940 A EP22772940 A EP 22772940A EP 4399366 A1 EP4399366 A1 EP 4399366A1
Authority
EP
European Patent Office
Prior art keywords
drying
web
negative pressure
sensors
fibrous web
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.)
Pending
Application number
EP22772940.7A
Other languages
German (de)
English (en)
Inventor
Andreas Ziegelwanger
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 EP4399366A1 publication Critical patent/EP4399366A1/fr
Pending legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
    • D21F5/046—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices using pocket ventilation systems
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
    • 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
    • D21G9/0036—Paper-making control systems controlling the press or drying section

Definitions

  • the invention relates to a method for optimizing the efficiency of the drying process in a paper machine with a process control system in the production of a fibrous web, which for drying is guided in a meandering pattern together with a permeable drying fabric in at least one drying group over steam-heated drying cylinders and drying fabric suction rolls.
  • a vacuum-loaded take-off device and a vacuum-loaded stabilization device are used to stabilize the removal of the fibrous web from the respective drying cylinder by the removal device and to stabilize the path of the fibrous web through the stabilization device to the subsequent vacuum-loaded dryer suction roll, and preferably two lateral overpressure chambers for the formation of air knives.
  • Document DE102019124500 A1 discloses a device for drying a fibrous web of a machine for producing or finishing the fibrous web.
  • the device comprises two drying cylinders which, together with a guide roll, form a pocket.
  • a pick-up device is associated with a drying cylinder for picking up the fibrous web from the drying cylinder at a pick-up point.
  • the take-off device In the area of the take-off point, the take-off device has a vacuum chamber which, viewed in the running direction of the fibrous web, has a machine-wide seal at the inlet and at the outlet of the fibrous web.
  • a stabilization zone following the vacuum zone is disclosed, which can also be placed under vacuum. The negative pressure in the negative pressure space can be set and controlled separately from the vacuum in the stabilization zone.
  • the known devices have various disadvantages. During the operation of a paper machine, various changing and disturbing influences occur.
  • the drying process must be designed in such a way that operation is more or less possible.
  • the type of paper produced, the speed of operation, the type of fabric, etc. can change.
  • the drying process must take place as far as possible without web breaks or web damage, which can lead to disruptions in the further processing of the fibrous web, with high productivity of the paper machine.
  • this is not always possible. For example, the speed of the paper machine often has to be reduced in order to keep the drying process stable.
  • the drying process can be optimized both with regard to drying and the drying process and also with regard to the runability of the fibrous web in that, on the one hand, process data from the paper machine, such as the machine speed and/or the basis weight of the fibrous web and/or the material composition in the Arithmetic unit evaluated together with the operating parameters of the web stabilizers and / or the drying cylinder and new control signals are sent to the actuators of several web stabilizers to specifically influence the operating parameters.
  • process data from the paper machine such as the machine speed and/or the basis weight of the fibrous web and/or the material composition in the Arithmetic unit evaluated together with the operating parameters of the web stabilizers and / or the drying cylinder and new control signals are sent to the actuators of several web stabilizers to specifically influence the operating parameters.
  • effects can also be taken into account that affect the drying process or the running behavior of the fibrous web, for example due to changes in the machine speed and/or the basis weight of the fibrous web and/or the substance composition affect.
  • the tendency of the fibrous web to stick should be mentioned as an example, which the operating personnel cannot easily and immediately recognize. If one compares the effects of different stock inputs for different types of paper on the runnability of the fibrous web, the tendency to stick with a first type of paper over several drying cylinders can be higher than with a second type of paper. According to the invention, the higher adhesive effect can now be counteracted, for example by increasing the negative pressure in the removal device and the stabilization device, and thus tears in the fibrous web or a reduction in the machine speed can be avoided. A reduction in the vacuum with a reduction in the adhesive effect is also conceivable. This anticipatory mode of operation enables the paper machine to achieve high productivity.
  • the removal device In the area of the pick-up point, the removal device has a vacuum space, also called a vacuum chamber, which, seen in the running direction of the fibrous web, has a machine-wide seal at the inlet and outlet of the fibrous web.
  • the fibrous web In this area, the fibrous web is in direct contact with the drying cylinder and is pressed against the drying cylinder by the drying fabric.
  • the two machine-wide seals thus seal off the vacuum space from the dryer fabric.
  • lumps can therefore come into contact between the dryer fabric and the seals.
  • These seals are therefore subject to wear and tear and must therefore be adjusted or replaced from time to time.
  • a proactive adjustment advantageously results in an increase in productivity during operation and an advantageous proactive, efficient planning of the replacement for upcoming maintenance is possible.
  • air knives For lateral sealing of the respective vacuum chamber of the removal device and the stabilization device, air knives (not shown here) can be provided on both sides, i.e. on the driver-side edge and the drive-side edge of the first web stabilizer and the second web stabilizer, each with an air chamber under overpressure for generating of an air jet, which is deflected with the help of the Coanda effect.
  • Air knives for sealing off a space from a moving wall, in this case the moving drying fabric are known and are formed by an air curtain. Mechanical seals can also be provided instead of the air knives.
  • each web stabilizer can have an exhaust fan or a throttle element for generating or influencing the negative pressure in the removal device and/or in the stabilization device.
  • the individual actuators can be controlled by individual control signals. This enables a very good optimization of the drying process.
  • actuators in a group are controlled with the same control signal.
  • the negative pressure in the removal device and/or the negative pressure in the stabilization device and/or the negative pressure in the respective dryer fabric suction roll is generated by at least one exhaust air fan which is connected directly or indirectly to the removal device and/or the stabilization device and/or to connected to the following dryer fabric suction roll by a pipeline.
  • the at least one exhaust air fan is driven by a speed-controllable motor and/or the pipeline is equipped with at least one controllable throttle element.
  • the motor and/or the throttle element can preferably be used as the actuator.
  • the at least two sensors of the web stabilizers can be selected from the group of pressure sensors, displacement sensors, position sensors, and wear sensors.
  • the at least two sensors and the actuators constantly deliver operating parameters or data to the process control system, in addition to further process data.
  • the data from the at least two sensors and/or the data from the settings of the actuators, preferably individual actuators, in combination with the process data can allow conclusions to be drawn about various developments or trends in the process parameters due to changes in operation, for example the data can be used to take off and/or sticking of the web can be detected at an early stage and counteracted by reducing and/or increasing the negative pressure in the web stabilizers.
  • Predictive control of the downstream web stabilizers based on the preceding web stabilizer data is also possible. This ensures constant optimization and monitoring.
  • the data determined can also advantageously be used for predictive maintenance of the components included without having to install another sensor precisely for this purpose. Due to the recorded variations in operation, trends can advantageously be determined with implemented and/or self-learning algorithms and can be output to the operating personnel as information for the upcoming next maintenance.
  • wear on the seals can advantageously be determined from the data from the sensors and/or actuators in combination with the known process data. As an example, data from pressure sensors and/or data from the vacuum actuators may be used to determine seal wear
  • the at least two sensors can preferably be pressure sensors.
  • the at least two sensors can also include a displacement sensor, for example to measure the wear of seals. With the information from the wear sensor, the negative pressure in the negative pressure chamber can be adjusted, thus avoiding negative consequences for the drying process.
  • the at least two sensors can be designed as speed sensors or sensors for determining the volume flow of the air for generating the negative pressure.
  • the process data can be selected from the group of basis weight of the fibrous web, machine speed, drying fabric tension, steam pressure in the drying cylinders, dryness of the fibrous web in the area of the respective web stabilizer.
  • the take-off point of the fibrous web from the drying cylinder surface is a particularly critical point with regard to the runability of the fibrous web, since the fibrous web tends to stick to the cylinder surface to a greater or lesser extent, depending on the operating conditions.
  • the tendency to stick depends, for example, on the value of the stock input, the speed of the paper machine, the basis weight and the dry content of the fibrous web.
  • the tendency to stick can therefore change over time and also during the progress of drying. For this reason, it is also advantageous to measure and, if necessary, to influence the operating parameters at least in at least two phases of the manufacturing process of the fibrous web that are offset in time. This is achieved by using the operating parameters of several web stabilizers, i.e. at least two, to optimize the drying process.
  • three or four or 5 web stabilizers can be used to optimize the drying process.
  • the invention can also be applied to individual dryer groups or to a complete dryer section.
  • the computing unit it is also possible for the computing unit to be equipped with a self-learning algorithm for determining the control signals for an optimized efficiency of the drying process.
  • a device for optimizing the efficiency of the drying process in a paper machine with a Process control system in particular for implementing the method according to claim 1, in the production of a fibrous web which, for drying, together with a permeable drying fabric in at least one drying group, is guided in meandering fashion alternately over steam-heated drying cylinders and drying-fabric suction rolls and web stabilizers between the steam-heated drying cylinders, each with a vacuum applied removal device and a stabilization device each subjected to negative pressure for stabilizing the removal of the fibrous web from the respective drying cylinder by the removal device and stabilizing the course of the fibrous web through the stabilization device up to the subsequent drying-wire suction roll subjected to negative pressure, and preferably with two lateral overpressure chambers for the formation of air knives, characterized that a) several web stabilizers, each with at least two sensors, and preferably subsequent dryer wire suction roll is equipped with a sensor for measuring operating parameters and that b) a computing unit is provided and that
  • the drying process 2 comprises a device 1 with a single-row drying arrangement with three drying cylinders 4.1, 4.2, 4.3 heated in a horizontal plane and heated by steam.
  • the fibrous web 3 is meandering out alternately together with a drying wire 6 over the drying cylinders 4.1, 4.2, 4.3 and over drying-wire suction rolls 5.
  • the fibrous web 3 comes into direct contact with the hot cylinder surface of the drying cylinders 4.1, 4.2, 4.3.
  • the drying wire suction rolls 5 have a drilled shell, which can have its own vacuum connection via the bearing journal, or—as in the present case—is singed through the web stabilizer 7, 8 via the drilled shell. In the area of the drying wire suction rolls 5, the drying wire 6 lies between the drilled mantle and the fibrous web 3. The negative pressure in the drying wire suction rolls 5 ensures that the fibrous web does not tear off at higher paper machine speeds or when using inferior stock furnishes to produce the fibrous web 3 .
  • a web stabilizer 7, 8 is installed in each pocket to stabilize the web run.
  • the first web stabilizer 7 and the second web stabilizer 8 have the same structure.
  • You have a removal device 7.1, 8.1 and a stabilization device 7.2, 8.2.
  • the removal device 7.1, 8.1 has a vacuum chamber 7.5, 8.5, which is sealed in the direction of travel 15 by machine-wide seals 7.6, 7.7, 8.6, 8.7 towards the drying fabric 6.
  • the vacuum chamber 7.5, 8.5 is arranged opposite the point at which the fibrous web 3 leaves the surface of the drying cylinder 4.1, 4.2.
  • the tendency to stick depends, for example, on the value of the stock input, the speed of the paper machine, the basis weight and the dry content of the fibrous web 3 .
  • the tendency to stick can therefore change over time and also during the progress of drying.
  • the negative pressure chamber 7.5, 8.5 of the removal device 7.1, 8.1 is connected via a pipe 16 to an exhaust air fan 12, which is driven by a variable-speed drive motor, to generate negative pressure.
  • the web stabilizer 7, 8 also has a vacuum-actuated stabilization device 7.2, 8.2 for stabilizing the fibrous web 3 lying on the dryer wire 6 between the drying cylinder 4.1, 4.2 and the dryer-wire suction roll 5.
  • the vacuum-acted stabilization device 7.2, 8.2 is via a channel, in which a throttle element 7.8, 8.8 designed as a throttle valve 7.8, 8.8 is connected to the vacuum chamber 7.5, 8.5 of the removal device 7.1, 8.1 for generating and maintaining the vacuum in the stabilization device 7.2, 8.2. Since the negative pressure in the stabilization device 7.2, 8.2 is always lower than the negative pressure in the negative pressure chamber 7.5, 8.5 of the removal device 7.1, 8.1, the negative pressure in the stabilization device 7.2, 8.2 can be adjusted via the throttle valve.
  • air knives can be provided on both sides, i.e. on the driver-side edge and the drive-side edge of the first web stabilizer 7 and the second web stabilizer 8 , each of which is connected to a pressurized air chamber to generate an air jet that is deflected using the Coanda effect.
  • Air knives for sealing off a space from a moving wall, in this case the moving drying fabric, are known and are formed by an air curtain. Mechanical seals can also be provided instead of the air knives.
  • Pressure sensors 7.3, 7.4, 8.3, 8.4 are provided in the vacuum chamber 7.5, 8.5 of the removal device 7.1, 8.1 and the stabilization device 7.2, 8.2, which are connected to a computing unit 10 via measurement data lines 11.1, 11.2, 11.3, 11.4.
  • the measurement data lines transmit the current operating parameters of the web stabilizers 7, 8 measured by the sensors to the arithmetic unit 10. It is also possible within the scope of the invention to connect further sensors to the arithmetic unit 10 via further measurement data lines.
  • the other sensors can be pressure sensors in the drying wire suction rolls, in the air chambers that are under overpressure to generate an air jet or wear sensors to measure the wear of the machine-wide seals 7.6, 7.7, 8.6, 8.7 of the removal device 7.1, 8.1.
  • the computing unit 10 is also connected to the process control system of the paper machine via a process data line 9.1.
  • the process data can include, for example, the basis weight of the fibrous web produced, the machine speed, the dryer fabric tension, the steam pressure in the drying cylinders 4.1, 4.2, 4.3, the dry content of the fibrous web 3 in the area of the respective web stabilizer 7, 8.
  • the operating parameters transmitted by the measurement data lines 11.1, 11.2, 11.3, 11.4 are evaluated in the arithmetic unit 10, taking into account the process data of the process control system 9.
  • Control signals for influencing the operating parameters are determined.
  • the control signals are transmitted to the corresponding actuators 7.8, 8.8, 12.1, 13, 14 via control signal lines 10.1, 10.2, 10.3.
  • these actuators are the throttle valve 7.8, 8.8, the drive motor 12.1, and the throttle valves 13, 14.

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  • Paper (AREA)

Abstract

L'invention concerne un procédé destiné à optimiser l'efficacité du processus de séchage dans une machine à papier avec un système de commande de processus (9) dans la production d'une bande de matière fibreuse (3), qui est guidée en méandres alternativement sur des cylindres de séchage chauffés à la vapeur (4.1, 4.2, 4.3) et des rouleaux aspirants de tamis de séchage (5), conjointement avec un tamis de séchage perméable (6), dans au moins un groupe de séchage, à des fins de séchage, et des stabilisateurs de bande (7, 8) entre les cylindres de séchage chauffés à la vapeur (4.1, 4.2, 4.3), chacun comportant une unité d'enlèvement (7.1, 8.1) appliquée avec un vide, et un dispositif de stabilisation respectif (7.2, 8.2) appliqué avec un vide pour stabiliser l'enlèvement de la bande de matière fibreuse (3) du cylindre de séchage respectif par le dispositif d'enlèvement (7.1, 8.1), et stabiliser la trajectoire de la bande de matière fibreuse (3) à travers le dispositif de stabilisation (7.2, 8.2). Le procédé selon l'invention se caractérise en ce que des stabilisateurs de bande (7, 8) multiples sont chacun pourvus d'au moins deux capteurs respectifs (7.3, 7.4, 8.3, 8.4) pour mesurer des paramètres de fonctionnement, en ce que les paramètres de fonctionnement mesurés sont évalués dans une unité informatique (10) conjointement avec des données de processus du système de commande de processus (9), et en ce que des signaux de commande résultants (10.1, 10.2, 10.3) sont utilisés pour optimiser le processus de séchage.
EP22772940.7A 2021-09-07 2022-09-02 Procédé et dispositif destinés à améliorer le processus de séchage dans une machine à papier Pending EP4399366A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021123077.2A DE102021123077A1 (de) 2021-09-07 2021-09-07 Verfahren und Vorrichtung zur Verbesserung des Trocknungsprozesses in einer Papiermaschine
PCT/EP2022/074468 WO2023036704A1 (fr) 2021-09-07 2022-09-02 Procédé et dispositif destinés à améliorer le processus de séchage dans une machine à papier

Publications (1)

Publication Number Publication Date
EP4399366A1 true EP4399366A1 (fr) 2024-07-17

Family

ID=83361223

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22772940.7A Pending EP4399366A1 (fr) 2021-09-07 2022-09-02 Procédé et dispositif destinés à améliorer le processus de séchage dans une machine à papier

Country Status (4)

Country Link
EP (1) EP4399366A1 (fr)
CN (1) CN118076781A (fr)
DE (1) DE102021123077A1 (fr)
WO (1) WO2023036704A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102024111120A1 (de) * 2024-04-22 2025-10-23 Voith Patent Gmbh Trockenpartie einer Maschine zur Herstellung einer Faserstoffbahn und Verfahren zum Betrieb einer Trockenpartie

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1788153A2 (fr) * 2005-11-19 2007-05-23 Voith Patent GmbH Dispositif pour le traitement d'une bande de matériau

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5535527A (en) 1995-06-07 1996-07-16 Valmet Corporation Method and arrangement in a multi-cylinder dryer of a paper machine
DE10140800A1 (de) 2001-08-20 2003-03-06 Voith Paper Patent Gmbh Vorrichtung zur Behandlung einer Faserstoffbahn
FI115921B (fi) 2004-01-15 2005-08-15 Metso Paper Inc Menetelmä paperikoneen kuivatusosassa kuivatusviiran kireyden mittaamiseksi
DE102005057638A1 (de) * 2005-12-02 2007-06-06 Voith Patent Gmbh Bahnüberwachung
AT516191B1 (de) * 2014-09-15 2016-08-15 Röchling Leripa Papertech Gmbh & Co Kg Dichtleistensysteme für Saugwalzen
DE102017127664A1 (de) * 2017-11-23 2019-05-23 Voith Patent Gmbh Prozessluftsystem
EP3699701A1 (fr) 2019-02-25 2020-08-26 Siemens Aktiengesellschaft Procédé et dispositif de détermination ou de prédiction d'une position d'une déchirure de la bande, programme informatique et installation industrielle
DE102019124500A1 (de) 2019-09-12 2020-09-10 Voith Patent Gmbh Vorrichtung zur Trocknung einer Faserstoffbahn

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1788153A2 (fr) * 2005-11-19 2007-05-23 Voith Patent GmbH Dispositif pour le traitement d'une bande de matériau

Also Published As

Publication number Publication date
WO2023036704A1 (fr) 2023-03-16
CN118076781A (zh) 2024-05-24
DE102021123077A1 (de) 2023-03-09

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