WO2014048811A1 - 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
WO2014048811A1
WO2014048811A1 PCT/EP2013/069370 EP2013069370W WO2014048811A1 WO 2014048811 A1 WO2014048811 A1 WO 2014048811A1 EP 2013069370 W EP2013069370 W EP 2013069370W WO 2014048811 A1 WO2014048811 A1 WO 2014048811A1
Authority
WO
WIPO (PCT)
Prior art keywords
formation
manipulated variables
processes
fiber
control
Prior art date
Application number
PCT/EP2013/069370
Other languages
German (de)
English (en)
Inventor
Oliver Kaufmann
Jens Haag
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=49232280&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2014048811(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to US14/432,242 priority Critical patent/US20150292158A1/en
Application filed by Voith Patent Gmbh filed Critical Voith Patent Gmbh
Priority to EP13770855.8A priority patent/EP2900868B1/fr
Priority to CN201380050700.5A priority patent/CN104704168B/zh
Publication of WO2014048811A1 publication Critical patent/WO2014048811A1/fr

Links

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 controlling the formation of a fibrous web of a fiber or papermaking process.
  • Fibrous webs can also be tissue or board web.
  • the fiber or papermaking process consists essentially 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.
  • 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 control the formation. In addition, the measured values can also be determined offline in the laboratory.
  • a particularly important measure in assessing the quality of the fibrous web is the formation, ie the fiber distribution and composition in the web.
  • the formation ie the fiber distribution and composition in the web.
  • other quality parameters such as printability, surface finish, strength, rigidity, optical quality, etc. can be improved.
  • the formation is influenced by various variable influencing variables or manipulated variables such as vacuum, screen tension, etc.
  • Each adjustment of a manipulated variable does not only influence the process that it should influence, but also subsequent processes. Adjustments of a process thus cause consequential effects such. B. greater Siebverschl build, more chemicals use, etc. These effects thus always have an impact on the total cost.
  • a number of publications are known from the prior art. For example, a method of optimizing formation by altering headbox consistency via lip opening is known. Further arrangements are disclosed in EP 1 454 012 A1 or WO 00/34575.
  • One of the objects of the invention is to propose a formation control which pre-conditions the formation in the fibrous web.
  • Another object of the invention is to provide a formation control method which makes it possible to stabilize paper machine operation.
  • a method is proposed for regulating the formation of a fibrous web of the type mentioned above, in which at least the manipulated variables of the individual processes or processes relevant to the formation are formed in the overall process as a function of definable secondary conditions.
  • 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, wherein at least some of the measured values are recorded inline and used directly or indirectly to control the formation.
  • the materials required to form the fibrous web are treated, combined and / or dehydrated.
  • the manipulated variables of the individual processes or processes in the overall process are formed as a function of definable secondary conditions Such negative effects can be prevented.
  • Subordinate conditions in the sense of the invention therefore mean conditions which define ranges of values which must not be left or which allow an adjustment of the manipulated variables only in a defined range, so that the measured values do not exceed certain limits at the measuring points assigned to the processes. or fall below.
  • the manipulated variables can be formed as a function of definable cost functions. A consequence could also be the costs. In this way, the formation or the overall process can be additionally optimized in such a way that the costs are reduced, whereby always the other constraints and finally also the formation must be within certain limits.
  • the cost function can also be used to assess the cost of expenditure resulting from the change in the manipulated variables. Furthermore, the cost function can also rate 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, auxiliaries and energies supplied in the successive process stages as well as the materials and emissions to be disposed of.
  • an optimization algorithm can be used by means of which the cost functions are optimized in compliance with the secondary conditions by adjusting all critical manipulated variables, taking into account the secondary conditions and the consequential effects, only to the extent that the formation reaches a target value or formation value.
  • the optimization algorithm for compliance with the formation constraints, the influencing manipulated variables of the individual processes or processes in the Total process influenced so that the amount of a possible deviation of the formation is minimized from the target value.
  • the optimization algorithm can also be provided with a model 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.
  • At least one of the following manipulated variables can be used to control the formation:
  • control variables can be used to control the formation: suspension jet geometry
  • control variables can be used to control the formation:
  • FIG. 1 shows a block diagram for the representation of the formation control
  • Figure 2 is a line diagram illustrating the relationships between
  • FIG. 1 shows a block diagram for the representation of the formation control with the aid of which the function of the system or the regulation of the formation can be described.
  • the system 1 of the formation of a fibrous web of a fiber or papermaking process is dependent on a plurality of successive individual process steps. Thus, in the individual process stages, different controllable chemical and / or physical processes or process steps take place as a function of measured values, in order to treat, combine and / or dewater the substance required for forming the fiber web.
  • FIG. 1 The individual process stages which are responsible for formation formation have been summarized in FIG. 1 in block 3.
  • the processes or processes can take place in the stock preparation, the wet-end process, the headbox and the former, wherein each process can be influenced by at least one manipulated variable 2.
  • manipulated variables a1, a2 reference is made to those already mentioned, although this is not an exhaustive list.
  • the secondary conditions have an influence on the formation by forming individual relevant manipulated variables as a function of definable secondary conditions.
  • the control strategy can be done using an optimization algorithm that minimizes the cost function while maintaining the constraints.
  • the consequential effects 5 result from the individual adjustments of the manipulated variables of the processes.
  • the follow-up effects can be measured online or in the lab and directly or indirectly fit into the constraints. In other words, the limits of the constraints are affected by the following conditions.
  • follow-up effects can be wear, energy consumption, chemicals consumption, etc.
  • FIG. 2 shows a line diagram for representing the relationships between manipulated variables, secondary conditions and costs with respect to a constant formation.
  • the parameters that can be adjusted by the control are valued by means of a corresponding price function as cost of expenditure.
  • follow-up costs resulting from the adjustable influencing variables are determined.
  • the cost function is thus calculated from the total costs of expenses and follow-up costs of setting the formation-relevant manipulated variables. This cost function is minimized via an optimization algorithm, while maintaining the constraints defined above, so that an (iterative) stepwise adjustment change takes place to a cost-optimal operating point, whereby the formation remains within a permissible tolerance band as a controlled variable.
  • the optimization algorithm may / may make the adjustments to comply with the formation constraint such that the amount of any deviation of the formation from the set point (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 through prior knowledge known a priori or through the evaluation of the effects of the previous adjustments. LIST OF REFERENCE NUMBERS

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

Abstract

L'invention concerne un procédé de réglage de la formation d'une bande continue de matière fibreuse dans un processus de production de fibres ou de papier, comprenant une pluralité d'étapes de procédé consécutives dans lesquelles, en fonction de valeurs de mesure, on effectue des opérations ou des étapes de transformation chimiques et/ou physiques réglables dans lesquelles les substances nécessaires pour former la bande continue de matière fibreuse sont traitées, réunies et/ou égouttées, en déterminant au moins certaines des valeurs de mesure en ligne et en les utilisant directement ou indirectement pour régler la formation. Le procédé de l'invention est caractérisé en ce qu'au moins les grandeurs de réglage des différentes opérations ou étapes de l'ensemble du processus influant de manière pertinente sur la formation sont formées en fonction de conditions secondaires définissables.
PCT/EP2013/069370 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 WO2014048811A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US14/432,242 US20150292158A1 (en) 2012-09-28 2012-09-18 Method for controlling the formation of a fiber web of a fiber or paper producing process
EP13770855.8A 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
CN201380050700.5A CN104704168B (zh) 2012-09-28 2013-09-18 控制纤维制造过程或造纸过程的纤维料幅的成型的方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012217729.9 2012-09-28
DE102012217729A DE102012217729A1 (de) 2012-09-28 2012-09-28 Verfahren zur Regelung einer Faserstoffbahnherstellungsmaschine zum Verbessern der Formation

Publications (1)

Publication Number Publication Date
WO2014048811A1 true WO2014048811A1 (fr) 2014-04-03

Family

ID=49232280

Family Applications (1)

Application Number Title Priority Date Filing Date
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

Country Status (5)

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

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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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WO2003040465A1 (fr) * 2001-11-09 2003-05-15 Metso Automation Oy Procede et appareil pour ajuster le fonctionnement d'une partie toile
EP1801288A1 (fr) * 2005-12-24 2007-06-27 Voith Patent GmbH Procédé et installation pour la fabrication d'une bande fibreuse
DE102010041052A1 (de) * 2010-09-20 2012-03-22 Voith Patent Gmbh Verfahren zum Regeln der Formation einer Faserstoffbahn

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EP1801288A1 (fr) * 2005-12-24 2007-06-27 Voith Patent GmbH Procédé et installation pour la fabrication d'une bande fibreuse
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Also Published As

Publication number Publication date
DE102012217729A1 (de) 2013-10-17
CN104704168B (zh) 2017-03-08
EP2900868B1 (fr) 2021-11-10
US20150292158A1 (en) 2015-10-15
CN104704168A (zh) 2015-06-10
EP2900868A1 (fr) 2015-08-05

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