EP3441521B1 - Procédé et dispositif de commande d'une unité d'usinage, produit- programme informatique ainsi que machine à papier - Google Patents

Procédé et dispositif de commande d'une unité d'usinage, produit- programme informatique ainsi que machine à papier Download PDF

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Publication number
EP3441521B1
EP3441521B1 EP17185535.6A EP17185535A EP3441521B1 EP 3441521 B1 EP3441521 B1 EP 3441521B1 EP 17185535 A EP17185535 A EP 17185535A EP 3441521 B1 EP3441521 B1 EP 3441521B1
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EP
European Patent Office
Prior art keywords
processing unit
detector
thz
paper machine
fibre
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.)
Active
Application number
EP17185535.6A
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German (de)
English (en)
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EP3441521A1 (fr
Inventor
Hermann Schwarz
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.)
Siemens Energy Global GmbH and Co KG
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Siemens Energy Global GmbH and Co KG
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Filing date
Publication date
Application filed by Siemens Energy Global GmbH and Co KG filed Critical Siemens Energy Global GmbH and Co KG
Priority to ES17185535T priority Critical patent/ES2935374T3/es
Priority to EP17185535.6A priority patent/EP3441521B1/fr
Priority to FIEP17185535.6T priority patent/FI3441521T3/de
Publication of EP3441521A1 publication Critical patent/EP3441521A1/fr
Application granted granted Critical
Publication of EP3441521B1 publication Critical patent/EP3441521B1/fr
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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
    • 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 and a device for controlling a processing unit.
  • the invention also relates to a computer program product and a paper machine.
  • a solution of (pulp) fibers is sprayed evenly onto a conveyor belt. After removing the excess water, a paper web is formed on the pulp fibers. After drying, the paper web is rolled up onto a paper roll.
  • the moisture, thickness and/or ash content are determined before the paper is rolled onto the paper roll.
  • the other processing units of the paper machine such as the refiner or the dryer section, are controlled with the aid of these variables.
  • WO 2009/062315 A1 describes a device for material measurement comprising a terahertz generator, which is set up to emit pulsed terahertz radiation at a measurement location of a material produced in a processing system.
  • the document EP 2 781 911 A1 describes a contactless sensor system and a method for determining the quality of paper material, for example dimensions, basis weight and moisture using terahertz radiation.
  • the method includes emitting a terahertz radiation signal in the direction of the paper material so that the terahertz radiation signal acts on the paper material, detecting a time and/or frequency response to the terahertz radiation signal, determining model parameters of a physical Model of the paper material and the determination of quality features of the paper material from it.
  • the document U.S. 2012/049070 A1 describes a device which can be arranged between a transmitter and a receiver of a terahertz time domain spectrometer and by means of which a laser pulse can be divided into a measurement pulse and a reference pulse.
  • WO 2011/045090 A1 describes a method of controlling a refiner for refining fibrous material.
  • the object is further achieved by a method according to claim 9.
  • THz waves it is possible to determine the properties of (pulp) fibers.
  • the orientation of the fibers, the length, in particular the average length, of the fibers and/or the overlapping of the fibers can be determined using THz waves or a THz detector.
  • the fiber composite is influenced in particular by where and to what extent the drying of the paper takes place.
  • the fiber properties in the fibrous material web are determined at short regular intervals, for example every 1 to 5 seconds, or in a continuous manner.
  • the fiber properties determined can significantly improve the control of the paper machine, in particular the refiner.
  • parameters such as process temperatures, amounts of steam, speeds and/or torques of motors and amounts of additives are controlled or regulated using specifications.
  • the specifications are preferably determined by simulating the respective process using control software.
  • the control software has inputs for measured variables such as determined temperatures or speed values.
  • the measured variables are used to support the simulation of the individual processes in the paper machine.
  • THz waves With the help of THz waves, it is also possible to easily determine the moisture content of the fibrous material web. For this purpose, the absorption of the THz waves during interaction with the fibrous web is determined. Water or moisture absorbs THz waves strongly.
  • a THz detector includes a detector for waves with a frequency of 0.1 THz to 100 THz.
  • a THz detector optionally has a source for waves in the THz range from 0.1 THz to 100 THz.
  • a frequency range between 0.5 THz and 10 THz is preferably detected with the THz detector.
  • the device for controlling a processing unit of a paper machine has at least one detector and a control device, the detector being designed to determine fiber properties of a fiber composite of a fibrous material web, the control device being provided on the basis of the fiber properties of the fiber composite for controlling or regulating the processing unit.
  • Specifications such as the speed of a drive of the processing unit, a torque of a drive or a process temperature in a processing unit are preferably controlled or regulated.
  • the specifications are preferably determined on the basis of the respective fiber property of the fiber composite of the fibrous material web.
  • An ultra-fast camera can serve as a detector, which takes pictures of the surface of the fibrous material web in quick succession.
  • a rapid succession is understood to mean, for example, between 1 image and 1,000 images per second. Preferably 1 to 50 images per second are recorded.
  • the images can be analyzed and the orientation of the fibre, the average length of the fibre, and other properties of the fibrous web can be determined.
  • average values of the orientation of the fibers and/or an average length of the fibers are determined.
  • the quality of the fibrous material web can be determined easily and reliably. Based on the determination of the fiber properties of the fibrous material web, in particular after drying, the quality of the fibrous material web can be increased by the processing unit being controlled or regulated on the basis of the fiber properties.
  • the processing unit can be a drying unit, a smoothing unit, a spraying unit, a refiner or a preparation unit for the fibers of the fibrous material web, in particular for processing the pulp.
  • the control of the refiner to influence the fiber properties is particularly advantageous.
  • the processing unit can better control or regulate the production of the fiber-containing material web, for example a paper web, based on the determined fiber properties.
  • the detector determines the fiber properties of the fibrous material web with the aid of terahertz waves.
  • the fiber properties of the fibrous material web are determined with the aid of terahertz waves (THz waves), preferably after the fibrous material web has been dried.
  • a processing unit in particular the refiner, can then be adjusted in terms of its control or regulation on the basis of the fiber properties.
  • the THz waves are preferably provided using a semiconductor diode.
  • the fiber properties are measured by absorption measurement and/or by reflection measurement.
  • a THz detector is preferably used as the detector. With the help of THz waves, the orientation of the fibers in the fibrous web can be easily determined.
  • the source of the THz waves is arranged on one side of the fibrous web and the detector on the other side of the fibrous web.
  • the source of the THz waves and the detector are arranged on the same side of the fibrous web.
  • the detector usually determines the intensity of the THz waves, the frequency of the THz waves or the phase of the THz waves.
  • the fiber property is preferably determined online. Online determination means that the respective fiber property determined with the detector is provided directly and preferably in real time.
  • detectors for the THz range in combination with sources for THz waves are already commercially available as components, a detector is understood below to mean a combination of a THz wave source and a THz wave detector.
  • the alignment of the fibers of the fiber composite and/or the length of the individual fibers can be determined by using THz waves.
  • the detector is located near a surface of the fibrous web.
  • the detector detects the THz waves that are reflected by the fibrous material web.
  • the detector can detect THz waves that have penetrated the fibrous material web.
  • the detection takes place with a THz detector.
  • An emitter for THz waves serves as the source. This is preferably arranged close to the THz detector and assigned to it.
  • the processing unit or the paper machine is controlled or regulated online.
  • An online control can be characterized by a model calculation of the processing units to be controlled.
  • the model calculation is supported by determined values of the respective processing unit.
  • online control takes place via a digital twin of the respective processing unit.
  • the fiber properties of the fibrous material web are determined and fed to the control device.
  • the control device serves to control the respective processing unit.
  • the method is designed to determine the fiber length, the fiber orientation and/or the overlapping of the fibers in the fiber composite.
  • the individual fiber properties of the fibrous web can be determined with a THz detector.
  • the fiber properties are determined before and after the fibrous material web has passed through the respective processing unit.
  • the processing device is a refiner.
  • a refiner is typically used to modify the fibers before they are applied to a web to form the fibrous web.
  • the fiber properties of the fiber-containing web can be influenced particularly efficiently.
  • a first detector for determining the fiber properties is provided before the respective processing unit and a second detector for determining the fiber properties is provided after the respective processing unit.
  • a before and after comparison of the fiber properties of the fibrous material web is advantageous in particular when controlling or regulating the press section and/or the dryer section.
  • a THz detector can advantageously determine the fiber properties before the press section, after the dryer section and/or between the press section and the dryer section.
  • the function of controlling or regulating the respective processing unit can take place. In this way, the respective processing unit can be optimized for itself.
  • the detector emits waves in the THz frequency range and detects reflected waves in the THz range.
  • the fiber properties of the fibrous material web can be determined with the aid of a detector as an assembly.
  • the respectively determined fiber property is provided for controlling or regulating the speed of the fibrous material web.
  • the control or regulation of the speed of the fibrous web serves, for example, to adjust the thickness of the fibrous web. Furthermore, the respective fiber properties can be changed by adjusting the speed. In this case, the fibrous material web has a higher web tension, in particular before it runs through the drying section.
  • the quality of the fiber-containing material web can advantageously be easily modified.
  • the processing unit is a dryer section, in particular an extended dryer section.
  • an extended dryer section has a pre-dryer section and/or an after-dryer section.
  • a particularly precise control or regulation of the dryer section, in particular the extended dryer section can take place on the basis of the fiber properties.
  • the fiber properties are preferably determined as part of the quality determination of the fibrous material web.
  • the fiber properties are preferably determined at the end of the manufacturing process of the fibrous material web. Accordingly, at least one detector is arranged in front of the winding device of a paper machine.
  • the at least one processing unit is controlled or regulated based on specifications such as speed, torque and/or process temperatures, with a detector determining fiber properties of a fibrous material web to provide the specifications.
  • the control or regulation method serves to control the respective processing unit and/or to control or regulate the paper machine.
  • the method enables a particularly precise control of the respective processing unit and/or the paper machine.
  • the detector determines the fiber properties using THz waves.
  • the detector is preferably used to determine the frequency, the phase or the intensity of the THz waves.
  • the fiber properties are preferably determined on the basis of the signals recorded by the detector.
  • a computer program product or a part of such a computer program product is preferably used to determine the respective fiber property based on the recorded signals.
  • the signals correspond in particular to the phase, the frequency, the intensity and/or the spatial and/or temporal intensity distribution of the THz waves.
  • the processing device is controlled or regulated online.
  • the processing unit is a refiner
  • the control device using the determined fiber properties controls or regulates the functioning of the refiner.
  • the refiner is used to adjust the length and shape of the fibers, especially the pulp fibers.
  • the setting is usually done by mechanical means.
  • the respective fiber properties in the fibrous web can be directly influenced.
  • the invention described here is implemented with the computer program product.
  • the computer program is installed and executable on a computing unit.
  • the computer program product can be part of an online control of the paper machine and/or individual processing units of the paper machine.
  • the computer program product is preferably designed to ensure the quality of the fiber web.
  • FIG 1 shows part of an exemplary paper machine.
  • the paper machine has a control device 3 and a fibrous web 1 , the fibrous web 1 passing through a processing unit 5 .
  • the fibrous web 1 is moved through the paper machine with the aid of a conveyor belt 1a.
  • the speed v and the direction of movement of the fibrous web 1 is represented by the arrow above the fibrous web 1 .
  • the processing unit 5 is controlled or regulated by the control device 3 .
  • the processing unit 5 can be a drying section of a paper machine.
  • Properties of the fibrous material web are determined by a detector 7 .
  • the detector 7 provides fiber properties FE to the Controller 3 ready.
  • Another detector 7 ′ is also used to determine fiber properties FE of the fibrous web 1 , the other detector 7 ′ determining the fiber properties FE before the fibrous web 1 enters the processing unit 5 .
  • the fibrous material web 1 is fixed in position by a respective deflection roller 10 .
  • the fibrous material web 1 has a speed v.
  • the control device 3 serves both to control the processing unit 5 and, optionally, to control the speed v of the fibrous material web 1.
  • the fiber properties FE are determined with the aid of a THz detector.
  • FIG 2 shows part of an exemplary paper machine.
  • the paper machine has three processing units 5a, 5b, 5c.
  • the first processing unit 5a serves to spray the cellulose-containing solution 9 onto the web 1.
  • the first processing device 5a preferably includes a refiner for modifying the fiber properties FE. By spraying on the cellulose-containing solution 9, the web becomes a fibrous web 1.
  • the second processing unit 5b is a drying section or an extended drying section.
  • the third processing unit 5c can be a quality control unit of the paper machine.
  • the third processing unit 5c has the detector 7, the detector 7 being designed to determine fiber properties FE.
  • the fiber properties FE of the fibrous material web 1 are made available to the control device 3 .
  • the control device 3 uses the fiber properties FE to control or regulate the first processing unit 5a and/or the second processing unit 5b.
  • the individual processing units 5a, 5b, 5c are preferably controlled or regulated online using the control device 3.
  • the detector 7 is preferably a THz detector.
  • the paper machine includes a first processing unit 5a, which is designed as a refiner.
  • the paper machine also has a second processing unit 5b, which is designed as a drying section or press section, and a third processing unit 5c, which is designed as a winding unit (winding section).
  • a conveyor belt 1a is used to convey a sprayed-on solution 9 containing cellulose.
  • the conveyor belt 1a serves to transport the fibrous material web 1.
  • the cellulose-containing solution 9 is provided by the first processing unit 5a.
  • the fiber properties FE of the cellulose-containing solution 9 sprayed on are determined by a first detector 7 .
  • the fiber properties FE are determined with the aid of a second detector 7'.
  • the fiber properties FE which are respectively determined by the first or second detector 7, 7', are made available to the control device 3.
  • the first, the second and optionally the third processing unit 5a, 5b, 5c are controlled or regulated.
  • water 12 and/or solid matter 14, in particular a wood-based pulp, to the refiner (first processing unit 5a) is controlled or regulated with the aid of the control device 3.
  • the invention relates to a method and a device for controlling a processing unit 5, 5a, 5b, 5c.
  • the invention also relates to a computer program product and a paper machine.
  • the respective fiber property FE of a fiber-containing material web 1, in particular a paper web, is determined with a detector 7, 7', in particular a THz detector.
  • a processing unit 5, 5a, 5b, 5c is controlled or regulated on the basis of the fiber properties FE.
  • the processing unit 5, 5a, 5b, 5c is preferably a refiner.

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  • Paper (AREA)
  • Sewing Machines And Sewing (AREA)

Claims (13)

  1. Installation de commande d'une unité (5, 5a, 5b, 5c) de traitement d'une machine à papier, comportant au moins un premier détecteur (7) et un deuxième détecteur (7') et un dispositif (3) de commande, dans laquelle les détecteurs (7, 7') sont constitués pour la détermination de propriétés (FE) des fibres d'un composite de fibre d'une nappe (1) fibreuse, à l'aide d'ondes tétra-hertziennes (THz), dans laquelle le dispositif (3) de commande est prévu pour la commande ou la régulation de l'unité (5, 5a, 5b, 5c) de traitement à l'aide des propriétés (FE) des fibres du composite de fibre, caractérisée en ce que le premier détecteur (7) est prévu pour la détermination des propriétés (FE) de fibres avant l'unité (5, 5a, 5b, 5c) de traitement respective, et le deuxième détecteur (7') est prévu pour la détermination des propriétés (FE) des fibres après l'unité (5, 5a, 5b, 5c) de traitement respective.
  2. Installation suivant la revendication 1, dans laquelle un détecteur (7, 7') détecte les ondes THz, qui sont réfléchies par la nappe (1) fibreuse.
  3. Installation suivant l'une des revendications précédentes, dans laquelle la commande ou la régulation de l'unité (5, 5a, 5b, 5c) de traitement ou de la machine à papier s'effectue en ligne.
  4. Installation suivant l'une des revendications précédentes, dans laquelle un détecteur (7, 7') est constitué pour la détermination de la longueur des fibres, de l'orientation des fibres et/ou du chevauchement des fibres dans le composite de fibre.
  5. Installation suivant l'une des revendications précédentes, dans laquelle le dispositif (5, 5a, 5b, 5c) de traitement est un raffineur.
  6. Installation suivant l'une des revendications précédentes, dans laquelle un détecteur (7, 7') émet des ondes dans le domaine fréquentiel du THz et détecte des ondes réfléchies dans le domaine du THz.
  7. Installation suivant l'une des revendications précédentes, dans laquelle les propriétés (FE) déterminées des fibres sont prévues pour la commande ou la régulation de la vitesse de la nappe (1) fibreuse.
  8. Installation suivant l'une des revendications précédentes, dans laquelle l'unité (5, 5a, 5b, 5c) de traitement est un train de séchage, notamment un train de séchage agrandi.
  9. Procédé de commande d'une unité (5, 5a, 5b, 5c) de traitement d'une machine à papier comprenant une installation suivant l'une des revendications précédentes, dans lequel on commande ou on régule la au moins une unité (5, 5a, 5b, 5c) de traitement, à l'aide de prescriptions, comme de vitesse, de couple et/ou de températures opératoires, dans lequel, pour disposer des prescriptions, le premier détecteur (7) détermine des propriétés (FE) des fibres d'une nappe (1) fibreuse avant l'unité (5, 5a, 5b, 5c) de traitement, et le deuxième détecteur (7') détermine des propriétés (FE) des fibres d'une nappe (1) fibreuse après l'unité (5, 5a, 5b, 5c) de traitement.
  10. Procédé suivant la revendication 9, dans lequel la commande ou la régulation de l'unité (5, 5a, 5b, 5c) de traitement s'effectue en ligne, des paramètres opératoires étant, à l'aide d'un logiciel de commande, déterminés au moyen d'une simulation de l'opération respective.
  11. Procédé suivant l'une des revendications 9 ou 10, dans lequel l'unité (5, 5a, 5b, 5c) de traitement est un raffineur et dans lequel le dispositif (3) de commande commande ou régule la façon de fonctionner du raffineur, à l'aide des propriétés (FE) des fibres, qui ont été déterminées.
  12. Produit de programme d'ordinateur à monter et à dérouler sur unité informatique, le programme d'ordinateur étant constitué pour effectuer un procédé suivant l'une des revendications 9 à 11.
  13. Machine à papier ayant une installation suivant l'une des revendications 1 à 8.
EP17185535.6A 2017-08-09 2017-08-09 Procédé et dispositif de commande d'une unité d'usinage, produit- programme informatique ainsi que machine à papier Active EP3441521B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
ES17185535T ES2935374T3 (es) 2017-08-09 2017-08-09 Procedimiento y dispositivo para controlar una unidad de procesamiento, producto de programa informático, así como máquina para fabricar papel
EP17185535.6A EP3441521B1 (fr) 2017-08-09 2017-08-09 Procédé et dispositif de commande d'une unité d'usinage, produit- programme informatique ainsi que machine à papier
FIEP17185535.6T FI3441521T3 (en) 2017-08-09 2017-08-09 Method and device for controlling a processing unit, computer program product and paper machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17185535.6A EP3441521B1 (fr) 2017-08-09 2017-08-09 Procédé et dispositif de commande d'une unité d'usinage, produit- programme informatique ainsi que machine à papier

Publications (2)

Publication Number Publication Date
EP3441521A1 EP3441521A1 (fr) 2019-02-13
EP3441521B1 true EP3441521B1 (fr) 2022-10-05

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EP17185535.6A Active EP3441521B1 (fr) 2017-08-09 2017-08-09 Procédé et dispositif de commande d'une unité d'usinage, produit- programme informatique ainsi que machine à papier

Country Status (3)

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EP (1) EP3441521B1 (fr)
ES (1) ES2935374T3 (fr)
FI (1) FI3441521T3 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7609366B2 (en) * 2007-11-16 2009-10-27 Honeywell International Inc. Material measurement system for obtaining coincident properties and related method
WO2011045090A1 (fr) * 2009-10-14 2011-04-21 Abb Research Ltd Technique et système pour broyer un matériau fibreux avec rendement d'énergie et qualité de pâte améliorés
US8378304B2 (en) * 2010-08-24 2013-02-19 Honeywell Asca Inc. Continuous referencing for increasing measurement precision in time-domain spectroscopy
EP2781911B1 (fr) * 2013-03-18 2019-10-16 ABB Schweiz AG Système de capteur et procédé pour déterminer des paramètres de qualité de feuilles de papier

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EP3441521A1 (fr) 2019-02-13
ES2935374T3 (es) 2023-03-06
FI3441521T3 (en) 2023-01-13

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