EP2900868B1 - Procédé de réglage de la formation d'une bande continue de matière fibreuse dans un processus de production de fibres ou de papier - Google Patents

Procédé de réglage de la formation d'une bande continue de matière fibreuse dans un processus de production de fibres ou de papier Download PDF

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Publication number
EP2900868B1
EP2900868B1 EP13770855.8A EP13770855A EP2900868B1 EP 2900868 B1 EP2900868 B1 EP 2900868B1 EP 13770855 A EP13770855 A EP 13770855A EP 2900868 B1 EP2900868 B1 EP 2900868B1
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EP
European Patent Office
Prior art keywords
formation
manipulated variables
function
processes
control
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Application number
EP13770855.8A
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German (de)
English (en)
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EP2900868A1 (fr
Inventor
Oliver Kaufmann
Jens Haag
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Voith Patent GmbH
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Voith Patent GmbH
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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
    • D21G9/0054—Paper-making control systems details of algorithms or programs
    • 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
    • D21G9/0027—Paper-making control systems controlling the forming section
    • 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
    • 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
    • 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

Definitions

  • the invention relates to a method for regulating the formation of a fibrous web of a fiber or paper manufacturing process.
  • Fibrous webs can also be tissue or cardboard webs, among other things.
  • the fiber or paper production process essentially consists of a number of successive individual process stages in which controllable chemical and / or physical processes or process steps take place as a function of measured values.
  • the substances required to form the fibrous web are treated, combined and / or dewatered in the individual process steps.
  • the measured values can be recorded inline and used directly or indirectly to regulate the formation. In addition, the measured values can also be determined offline in the laboratory.
  • a particularly important measured variable when assessing the quality of the fibrous web is the formation, i.e. the fiber distribution and composition in the web.
  • the formation i.e. the fiber distribution and composition in the web.
  • the formation is influenced by various variable influencing variables or manipulated variables such as vacuum, screen tension, etc.
  • variable influencing variables or manipulated variables such as vacuum, screen tension, etc.
  • every adjustment of a manipulated variable not only influences the process it is supposed to influence, but also subsequent processes. Adjustments of a process cause consequential effects such as B. greater screen wear, more chemicals, etc. These effects always have an influence on the total costs.
  • WO 03/040465 A1 discloses a method for regulating the formation of a fibrous web of a fiber or paper manufacturing process, which consists of a plurality of successive individual process stages in which controllable chemical and / or physical processes or process steps take place as a function of measured values in which the substances required to form the fibrous web treated, merged and / or dewatered, in which at least some of the measured values are recorded inline and used directly or indirectly to regulate the formation and at least the manipulated variables of the individual operations or processes in the overall process that influence the formation are formed depending on definable secondary conditions.
  • One of the objects of the invention is to propose a formation control which pre-improves the formation in the fibrous web.
  • Another object of the invention is to provide a method for regulation of formation which allows the paper machine operation to be stabilized.
  • the formation is influenced by a plurality of successive individual process stages in which controllable chemical and / or physical processes or process steps take place as a function of measured values, at least some of the measured values being recorded inline and used directly or indirectly to regulate the formation.
  • the substances required to form the fibrous web are treated, combined and / or dewatered.
  • all measured values are processed in a data processing system and manipulated variables are generated from them according to defined specifications.
  • control values When the control values are adjusted, consequential effects occur that are undesirable. Thus, by adjusting a control value, the formation can be improved as a result of increased screen wear occur when z. B. the vacuum is set too high.
  • the manipulated variables of the individual procedures or processes in the overall process are formed as a function of definable secondary conditions such negative effects can be prevented.
  • secondary conditions are understood to mean conditions that define value ranges that must not be left or that only allow adjustment of the control values in a defined range, so that the measured values do not exceed and / or exceed certain limits at the measuring points assigned to the processes. or fall below.
  • the manipulated variables are formed as a function of definable cost functions.
  • the cost function can also be used to evaluate the expenditure costs that arise as a result of the change in the manipulated variables. Furthermore, the cost function can also evaluate the follow-up costs.
  • the secondary conditions can be formed both as a function of the starting materials or raw materials and / or of the chemicals, auxiliary materials and energies supplied in the successive process stages as well as the materials and emissions to be disposed of.
  • an optimization algorithm is used by means of which the cost functions are optimized while observing the secondary conditions, in that all decisive manipulated variables, taking into account the secondary conditions and the consequential effects, are only adjusted to the extent that the formation reaches a target value or formation value.
  • the optimization algorithm can control the influencing variables of the individual operations or processes in the
  • the overall process is influenced in such a way that the amount of a possible deviation of the formation from the target value is minimized.
  • a model can also be stored in the optimization algorithm, which qualitatively reproduces the influence of the manipulated variables on the formation either via a priori prior knowledge or by evaluating the effects of the previous adjustments, whereby the dead times of the processes are advantageously taken into account.
  • the individual processes within the meaning of the invention essentially take place in the stock preparation, the headbox and the wet end of a fibrous web manufacturing machine.
  • One of the particular advantages of the invention is that the operational stability and the formation can be stabilized in such a way that the costs of the overall process can be reduced to an optimal minimum.
  • Figure 1 shows a block diagram to illustrate the formation control, with the help of which the function of the system or the control of the formation can be described.
  • the system or the regulation 1 of the formation of a fibrous web of a fiber or paper manufacturing process is dependent on a plurality of successive individual process stages. In the individual process steps, different controllable chemical and / or physical processes or process steps take place as a function of measured values in order to treat, bring together and / or dewater the material required for the formation of the fibrous web.
  • the secondary conditions have an influence on the formation in that individual relevant manipulated variables are formed as a function of definable secondary conditions.
  • the secondary conditions are defined in such a way that particularly stable paper machine operation is guaranteed. Certain measured values must therefore not exceed certain limits that must be adhered to in order to optimize the formation.
  • the control strategy can be implemented with the help of an optimization algorithm that minimizes the cost function while maintaining the constraints.
  • the subsequent effects 5 result from the individual adjustments to the manipulated variables of the processes.
  • the secondary effects can be measured online or in the laboratory and are incorporated directly or indirectly into the secondary conditions. In other words, the limits of the secondary conditions are influenced by the subsequent conditions. Consequential effects can be wear and tear, energy consumption, chemical consumption, etc.
  • Figure 2 is a line diagram to show the relationships between manipulated variables, constraints and costs in relation to a constant formation.
  • the influencing variables (expenditure) that can be adjusted by the regulation are evaluated as expenditure costs using a corresponding price function.
  • Follow-up costs that arise from the adjustable influencing variables are also determined.
  • the cost function is thus calculated from the total costs from expenditure and follow-up costs of setting the formation-relevant control variables. This cost function is minimized by means of an optimization algorithm in compliance with the secondary conditions defined above, so that an (iterative) step-by-step change in setting takes place at a cost-optimal operating point, with the formation as a control variable remaining within a permissible tolerance band.
  • the optimization algorithm is / can design the adjustments in such a way that the amount of a possible deviation of the formation from the target value (range) is minimized (ideally to 0). This can be done using a model that quantitatively reproduces the influence of the manipulated variables on the formation either using prior knowledge known a priori or by evaluating the effects of the previous adjustments.

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  • Engineering & Computer Science (AREA)
  • Software Systems (AREA)
  • Paper (AREA)

Claims (13)

  1. Procédé de commande de la formation d'une nappe de fibres d'un processus de fabrication de fibres ou de papier, qui est constitué de plusieurs étapes de processus individuelles successives, dans lesquelles se déroulent des processus ou des étapes de processus chimiques et/ou physiques commandables en fonction de valeurs de mesure, dans lesquelles les substances nécessaires à la formation de la nappe de fibres sont traitées, combinées et/ou déshydratées, dans lesquelles au moins une partie des valeurs de mesure est saisie en ligne et utilisée directement ou indirectement pour la commande de la formation, et au moins les grandeurs de réglage des processus individuels ou des processus du processus global, qui ont une influence importante sur la formation, sont formées en fonction de conditions secondaires définissables,
    caractérisé en ce que
    les variables manipulées sont formées en fonction de fonctions de coût définissables et que les coûts sont minimisés au moyen de la fonction de coût via un algorithme d'optimisation tout en respectant les contraintes.
  2. Méthode selon la revendication 1,
    caractérisé en ce que
    la fonction de coût évalue les coûts d'effort encourus par la modification des variables manipulées.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    la fonction de coût évalue les coûts conséquents qui découlent de la modification des variables manipulées.
  4. Méthode selon la revendication 1,
    caractérisé en ce que
    la contrainte est une contrainte d'égalité.
  5. Méthode selon la revendication 1,
    caractérisé en ce que
    la contrainte est une inégalité.
  6. Méthode selon la revendication 1,
    caractérisé en ce que
    les conditions secondaires sont formées à la fois en fonction des matériaux de départ ou des matières premières et/ou des produits chimiques, des matières auxiliaires et des énergies ajoutés au cours des étapes successives du processus et des matériaux et émissions à éliminer.
  7. Méthode selon la revendication 1,
    caractérisé en ce que
    l'algorithme d'optimisation, afin de respecter les contraintes de formation, influence les variables de commande influentes des séquences ou processus individuels dans le processus global de telle sorte que la quantité de tout écart de la formation par rapport à la valeur de consigne soit minimisée.
  8. Procédé selon la revendication 1 ou 7,
    caractérisé en ce que
    l'algorithme d'optimisation est basé sur un modèle qui reflète qualitativement l'influence des variables manipulées sur la formation, soit par une connaissance a priori, soit en évaluant les effets des ajustements précédents.
  9. Méthode selon la revendication 1,
    caractérisé en ce que
    les différents processus se déroulent essentiellement dans les sections de préparation de la pâte, de la caisse de tête et de la partie humide d'une machine de production de bandes de fibres.
  10. Méthode selon la revendication 9,
    caractérisé en ce que
    dans la préparation des actions, au moins une des variables manipulées suivantes est utilisée pour contrôler la formation :
    - Type d'agent de rétention
    - Point de dosage de l'agent de rétention
    - Quantité d'agent de rétention
    - Capacité de broyage
    - Performance du disperseur
    - Composition du tissu
    - Quantité de fixateur
  11. Méthode selon la revendication 9,
    caractérisé en ce que
    dans la caisse de tête, au moins une des variables manipulées suivantes est utilisée pour contrôler la formation :
    - Géométrie de la poutre de suspension
    - Ouverture des lèvres
    - Position de l'ouverture
    - Position des lamelles
    - Position d'insertion
    - Différence de vitesse jet-sieve
  12. Méthode selon la revendication 9,
    caractérisé en ce que
    dans la section humide, au moins une des variables manipulées suivantes est utilisée pour contrôler la formation :
    - Géométrie de la bande de drainage
    - Pression des barres de drainage
    - Vide
    - Tension du tamis
  13. Méthode selon la revendication 1,
    caractérisé en ce que
    l'une des variables manipulées est la vitesse de la machine.
EP13770855.8A 2012-09-28 2013-09-18 Procédé de réglage de la formation d'une bande continue de matière fibreuse dans un processus de production de fibres ou de papier Active EP2900868B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012217729A DE102012217729A1 (de) 2012-09-28 2012-09-28 Verfahren zur Regelung einer Faserstoffbahnherstellungsmaschine zum Verbessern der Formation
PCT/EP2013/069370 WO2014048811A1 (fr) 2012-09-28 2013-09-18 Procédé de réglage de la formation d'une bande continue de matière fibreuse dans un processus de production de fibres ou de papier

Publications (2)

Publication Number Publication Date
EP2900868A1 EP2900868A1 (fr) 2015-08-05
EP2900868B1 true EP2900868B1 (fr) 2021-11-10

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EP13770855.8A Active EP2900868B1 (fr) 2012-09-28 2013-09-18 Procédé de réglage de la formation d'une bande continue de matière fibreuse dans un processus de production de fibres ou de papier

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Country Link
US (1) US20150292158A1 (fr)
EP (1) EP2900868B1 (fr)
CN (1) CN104704168B (fr)
DE (1) DE102012217729A1 (fr)
WO (1) WO2014048811A1 (fr)

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US20150292158A1 (en) * 2012-09-28 2015-10-15 Voith Patent Gmbh Method for controlling the formation of a fiber web of a fiber or paper producing process
DE102016216387A1 (de) 2016-08-31 2018-03-01 Voith Patent Gmbh Verfahren zur Steuerung einer Faserstoffbahnherstellungsmaschine
DE102016120647B4 (de) * 2016-10-28 2018-07-26 Voith Patent Gmbh Verfahren zum Betreiben einer Maschine zur Herstellung einer Faserstoffbahn

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Also Published As

Publication number Publication date
WO2014048811A1 (fr) 2014-04-03
US20150292158A1 (en) 2015-10-15
CN104704168B (zh) 2017-03-08
CN104704168A (zh) 2015-06-10
EP2900868A1 (fr) 2015-08-05
DE102012217729A1 (de) 2013-10-17

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