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EP4211305B1 - Fonctionnement d'une section de séchage d'une machine à papier - Google Patents

Fonctionnement d'une section de séchage d'une machine à papier Download PDF

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Publication number
EP4211305B1
EP4211305B1 EP21801021.3A EP21801021A EP4211305B1 EP 4211305 B1 EP4211305 B1 EP 4211305B1 EP 21801021 A EP21801021 A EP 21801021A EP 4211305 B1 EP4211305 B1 EP 4211305B1
Authority
EP
European Patent Office
Prior art keywords
paper web
temperature
melting point
dryer section
determined
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
EP21801021.3A
Other languages
German (de)
English (en)
Other versions
EP4211305A1 (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
Original Assignee
Siemens Energy Global GmbH and Co KG
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 Siemens Energy Global GmbH and Co KG filed Critical Siemens Energy Global GmbH and Co KG
Publication of EP4211305A1 publication Critical patent/EP4211305A1/fr
Application granted granted Critical
Publication of EP4211305B1 publication Critical patent/EP4211305B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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 operating a drying section of a paper machine.
  • Waste paper is an important raw material in paper production.
  • the waste paper In order to prepare waste paper for paper production, the waste paper is shredded and any impurities contained in the waste paper are removed and additives are added if necessary.
  • the waste paper is usually dissolved in a pulper to form a fiber suspension. Impurities, which consist of plastic, metal, glass or ash, for example, are separated from the usable fibers of the waste paper during material preparation.
  • the processed fiber suspension is fed to a paper machine for paper production.
  • the DE 1194692 A a temperature control device for the drying cylinders of a paper machine with rules assigned to several individual cylinders or groups of cylinders.
  • the WO 2012055897 A1 a method and a device for detecting deposits on surfaces of moving machine parts in paper machines.
  • Some of these contaminants remain in the paper produced and can reduce the quality of the paper.
  • Other contaminants stick to paper web contact surfaces that are in contact with a paper web passing through the drying section of the paper machine. Such paper web contact surfaces are in particular the surfaces of drying cylinders over which the paper web is guided in the drying section. These deposits can be carried along by the paper web and cause paper web breaks, which in turn lead to paper production downtimes and/or impair the quality of the paper produced.
  • scrapers are placed on the surfaces of drying cylinders to scrape deposits from the surfaces and feed them into collecting containers.
  • deposits build up on such a scraper instead of falling into a collecting container. In this case, the scrapers must be replaced.
  • the invention is based on the object of reducing deposits of contaminants on paper web contact surfaces in the drying section of a paper machine.
  • the object is achieved according to the invention by a method having the features of claim 1 and by a drying section having the features of claim 12.
  • a melting point of a deposit is determined on at least one paper web contact surface which, in the drying section, is in contact with a paper web passing through the drying section, and a temperature in at least one region of the drying section is controlled or regulated as a function of the at least one determined melting point.
  • the invention is based on the knowledge that deposits on paper web contact surfaces in a drying section of a paper machine form in particular because impurities contained in a paper web passing through the drying section melt due to the increased temperature in the drying section and subsequently stick to paper web contact surfaces.
  • the method according to the invention therefore provides for determining a melting point of a deposit on at least one paper web contact surface. Knowledge of the melting point makes it possible to control or regulate a temperature in the drying section depending on the determined melting point, so that melting of impurities in the drying section and thus deposits on paper web contact surfaces in the drying section can be reduced.
  • the melting point of a deposit on at least one paper web contact surface is repeatedly determined.
  • This embodiment of the method according to the invention takes into account that the composition of the waste paper from which the fiber suspension is produced and fed to the paper machine can change. Therefore, the contaminants contained in the paper web passing through the drying section can also change. Repeated determination of the melting points of deposits on paper web contact surfaces in the drying section enables the control or regulation of the temperature in the drying section to be adapted to changing contaminants and in particular to changing melting points of these contaminants.
  • the melting point of a deposit on at least one paper web contact surface which is arranged in an entrance area of the drying section in which the paper web enters the drying section.
  • the melting point of a deposit on a paper web contact surface is determined, which is arranged in an area of the drying section in which the temperature of the paper web is increased within the drying section.
  • the melting point of a deposit on at least one paper web contact surface which is a surface of a drying cylinder
  • the temperature of the paper web is increased on a drying cylinder, which can lead to the melting of contaminants in the paper web when contacting the surface of the drying cylinder and to deposits of melted contaminants on the surface. Therefore, in the method according to the invention, melting points of deposits on the surfaces of drying cylinders are preferably determined.
  • the melting point of a deposit is determined using differential scanning calorimetry (DSC).
  • DSC differential scanning calorimetry
  • DTA differential thermal analysis
  • Dynamic differential calorimetry and differential thermal analysis are known methods for the thermal analysis of samples, with which the amount of heat absorbed or released by the sample or temperature changes when the sample is heated or cooled in comparison to a reference container or a reference substance, in particular when the sample undergoes a phase transition, are determined. In particular, these methods can be used to determine the temperature at which a phase transition of the sample occurs. These methods are therefore also suitable for determining the melting point of a deposit on a paper web contact surface in the drying section.
  • a temperature in at least one region of the drying section is controlled or regulated in such a way that the temperature of the paper web in this region does not exceed the determined melting point of a deposit.
  • This embodiment of the method according to the invention aims to prevent melting of contaminants in the paper web in at least one region of the drying section by keeping the temperature in this region below the melting temperature of these contaminants.
  • a temperature function for a temperature depending on the melting point of a deposit on at least one paper web contact surface is specified for at least one area of the drying section and a temperature in this area is controlled or regulated using the temperature function.
  • a temperature in at least one area of the drying section is set or regulated to a value which is the function value of the temperature function specified for this area. Temperature function at the point defined by the at least one determined melting point.
  • the aforementioned embodiment of the method according to the invention provides for the temperature in at least one area of the drying section to be controlled or regulated using a predetermined temperature function that specifies a temperature in this area depending on a melting point of a deposit on at least one paper web contact surface.
  • the temperature function is determined, for example, by a mathematical model, experimental investigations and/or empirical values.
  • the temperature function can also be generated and improved by machine learning.
  • the temperature function is stored, for example, in a memory unit of a control or regulating unit that is set up to control or regulate a temperature in at least one area of the drying section.
  • a temperature in at least one region of the drying section is controlled or regulated by heating drying cylinders of the drying section.
  • This embodiment of the method according to the invention makes use of the fact that a drying section has heatable drying cylinders for drying a paper web, the drying cylinders generally being heated with steam. Temperatures in the drying section can therefore be influenced in particular by changes in the heating of drying cylinders.
  • a drying section of a paper machine comprises a measuring arrangement which is designed to determine a melting point of a deposit on at least one paper web contact surface which is in contact with a paper web passing through the drying section in the drying section, and a control or regulating unit which is designed to determine a temperature in at least one range the drying section depending on the determined melting point.
  • the measuring arrangement and the control or regulating unit enable the implementation of the method according to the invention for operating the drying section with the above-mentioned advantages.
  • the single figure shows a schematic section of a drying section 1 of a paper machine according to the invention.
  • the drying section 1 has several drying cylinders 3, of which only one is shown in the figure.
  • a paper web 5 is guided over the drying cylinders 3.
  • the drying cylinders 3 can each be heated by a heater 7 in order to dry the paper web 5.
  • the heaters 7 are designed as steam heaters, through which steam can be supplied to the drying cylinders 3.
  • deposits 11 can form on paper web contact surfaces 9 that are in contact with the paper web 5, which are caused in particular by the melting of contaminants contained in the paper web 5 and stick to paper web contact surfaces 9.
  • Such paper web contact surfaces 9 are in particular the surfaces of drying cylinders 3.
  • the drying section 1 comprises a measuring arrangement 13 which is designed to determine a melting point of a deposit on at least one paper web contact surface 9, which is a surface of a drying cylinder 3. Furthermore, the drying section 1 comprises a control or regulating unit 15 which is designed to control or regulate a temperature in at least one region of the drying section 1 depending on the determined melting point. The heating 7 of at least one drying cylinder 3 is controlled or regulated by the control or regulating unit 15.
  • a scraper 17 is placed on the surface of a drying cylinder 3, by which deposits 11 are scraped off the surface of the drying cylinder 3 and fed to a collecting container 19.
  • a sample of such a deposit 11 is fed from the collecting container 19 to the measuring arrangement 13 via a feed line 21, for example via a hose.
  • the melting point of the deposit 11 is determined by the measuring arrangement 13.
  • the melting point of the deposit 11 is determined by the measuring arrangement 13 using dynamic differential calorimetry or differential thermal analysis. The determined melting point is transmitted to the control or regulating unit 15.
  • a temperature function is specified for the temperature as a function of the melting point of a deposit 11 on at least one paper web contact surface 9.
  • the control or regulating unit 15 sets or regulates the temperature in the area of the drying section 1 to a value that is the function value of the specified temperature function at the point defined by the at least one determined melting point.
  • the temperature is controlled or regulated in such a way that it does not exceed a determined melting point.

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  • Paper (AREA)

Claims (12)

  1. Procédé pour faire fonctionner une partie (1) sèche d'une machine à papier, dans lequel
    - on détermine un point de fusion d'un dépôt (11) sur au moins une surface (9) de contact de bande de papier, qui dans la partie (1) sèche est en contact avec une bande (5) de papier, passant dans la partie (1) sèche, et
    - on commande ou on règle une température dans au moins une partie de la partie (1) sèche en fonction du au moins un point de fusion déterminé.
  2. Procédé suivant la revendication 1, dans lequel on détermine, de manière répétée, le point de fusion d'un dépôt (11) sur au moins une surface (9) de contact de bande de papier.
  3. Procédé suivant la revendication 1 ou 2, dans lequel on détermine le point de fusion d'un dépôt (11) sur au moins une surface (9) de contact de bande de papier, qui est disposée dans une partie d'entrée de la partie (1) sèche, dans laquelle la bande (5) de papier entre dans la partie (1) sèche.
  4. Procédé suivant l'une des revendications précédentes, dans lequel on détermine le point de fusion d'un dépôt (11) sur une surface (9) de contact de bande de papier, qui est disposée dans la partie de la partie (1) sèche, dans laquelle on élève la température de la bande (5) de papier dans la partie (1) sèche.
  5. Procédé suivant l'une des revendications précédentes, dans lequel on détermine le point de fusion d'un dépôt (11) sur au moins une surface (9) de contact de bande de papier, qui est une surface d'un cylindre (3) de séchage.
  6. Procédé suivant l'une des revendications précédentes, dans lequel on détermine le point de fusion d'un dépôt (11) par une calorimétrie différentielle dynamique.
  7. Procédé suivant l'une des revendications précédentes, dans lequel on détermine le point de fusion d'un dépôt (11) par une thermoanalyse différentielle.
  8. Procédé suivant l'une des revendications précédentes, dans lequel on commande ou on règle une température dans au moins une partie de la partie (1) sèche, de manière à ce que la température de la bande (5) de papier dans cette partie ne dépasse pas le point de fusion déterminé d'un dépôt (11).
  9. Procédé suivant l'une des revendications précédentes, dans lequel, pour au moins une partie de la partie (1) sèche, on prescrit une fonction de température pour une température en fonction du point de fusion d'un dépôt (11) sur au moins une surface (9) de contact de bande de papier et on commande ou on règle une température dans cette partie à l'aide de la fonction de température.
  10. Procédé suivant la revendication 9, dans lequel on établit ou on règle une température dans au moins une partie de la partie (1) sèche a une valeur, qui est la valeur de la fonction de température prescrite pour cette partie au point défini par le au moins un point de fusion déterminé.
  11. Procédé suivant l'une des revendications précédentes, dans lequel on commande ou on règle une température dans au moins une partie de la partie (1) sèche par un chauffage (7) d'au moins un cylindre (3) de séchage de la partie (1) sèche.
  12. Partie (1) sèche d'une machine à papier, la partie (1) sèche comprenant
    - un agencement (13) de mesure, qui est agencé pour déterminer un point de fusion d'un dépôt (11) sur au moins une surface (9) de contact de bande de papier, qui est en contact dans la partie (1) sèche avec une bande (5) de papier passant dans la partie (1) sèche, et
    - une unité (15) de commande ou de réglage, qui est agencée pour commander ou régler une température dans au moins une partie de la partie (1) sèche en fonction du point de fusion déterminé.
EP21801021.3A 2020-11-09 2021-10-14 Fonctionnement d'une section de séchage d'une machine à papier Active EP4211305B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020214048.0A DE102020214048A1 (de) 2020-11-09 2020-11-09 Betreiben einer Trockenpartie einer Papiermaschine
PCT/EP2021/078515 WO2022096248A1 (fr) 2020-11-09 2021-10-14 Fonctionnement d'une section de séchage d'une machine à papier

Publications (2)

Publication Number Publication Date
EP4211305A1 EP4211305A1 (fr) 2023-07-19
EP4211305B1 true EP4211305B1 (fr) 2025-02-19

Family

ID=78463442

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21801021.3A Active EP4211305B1 (fr) 2020-11-09 2021-10-14 Fonctionnement d'une section de séchage d'une machine à papier

Country Status (6)

Country Link
EP (1) EP4211305B1 (fr)
CN (1) CN116457530A (fr)
DE (1) DE102020214048A1 (fr)
ES (1) ES3027614T3 (fr)
FI (1) FI4211305T3 (fr)
WO (1) WO2022096248A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1194692B (de) * 1961-12-22 1965-06-10 Siemens Ag Temperaturregeleinrichtung fuer die Trockenzylinder einer Papiermaschine
US4016030A (en) 1975-01-29 1977-04-05 Fort Howard Paper Company Calendering paper containing thermoplastic contaminants
DE19736847A1 (de) 1997-08-23 1999-02-25 Voith Sulzer Papiermasch Gmbh Vorrichtung zur Vermeidung von Ablagerungen hydrophober Störstoffe
DE102004037215A1 (de) 2004-07-30 2006-03-23 Voith Paper Patent Gmbh Verfahren zur Reinigung der Oberflächen von Walzen
US7735435B2 (en) * 2006-05-24 2010-06-15 Diamond Power International, Inc. Apparatus for cleaning a smelt spout of a combustion device
FI121938B3 (fi) * 2007-10-01 2012-02-29 Kemira Oyj Menetelmä kerrostumien muodostumisen kontrolloimiseksi
DE102011085220A1 (de) * 2010-10-29 2012-05-03 Emtec Electronic Gmbh Verfahren und Vorrichtung zur Erkennung von Stickyablagerungen bei der Papierproduktion

Also Published As

Publication number Publication date
DE102020214048A1 (de) 2022-05-12
FI4211305T3 (fi) 2025-05-20
ES3027614T3 (en) 2025-06-16
CN116457530A (zh) 2023-07-18
EP4211305A1 (fr) 2023-07-19
WO2022096248A1 (fr) 2022-05-12

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