EP4211305A1 - Betreiben einer trockenpartie einer papiermaschine - Google Patents
Betreiben einer trockenpartie einer papiermaschineInfo
- Publication number
- EP4211305A1 EP4211305A1 EP21801021.3A EP21801021A EP4211305A1 EP 4211305 A1 EP4211305 A1 EP 4211305A1 EP 21801021 A EP21801021 A EP 21801021A EP 4211305 A1 EP4211305 A1 EP 4211305A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- paper web
- melting point
- temperature
- determined
- deposit
- 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.)
- Granted
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
-
- 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 dryer section of a paper machine.
- Waste paper is an important raw material in paper production.
- the waste paper is shredded and impurities contained in the waste paper are removed and, if necessary, additives are added.
- the waste paper is usually dissolved in a pulper to form a fiber suspension. Impurities, such as plastic, metal, glass or ash, are separated from the usable fibers of the waste paper during material processing.
- the prepared fiber suspension is fed to a paper machine for paper production.
- impurities such as starch, binders or ashes stick to the fibres.
- impurities in the narrow water cycle of paper production are first detached from the fibers, but later come into contact with the fibers again. In any case, impurities reach the paper machine.
- paper web contact surfaces that are in contact with a paper web running through the dryer section of the paper machine.
- Such paper web contact surfaces are in particular surfaces of Drying cylinders over which the paper web is guided in the drying section.
- scrapers are placed on the surfaces of drying cylinders in order to scrape deposits from the surfaces and
- the object of the invention is to reduce deposits of disruptive substances 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 dryer section having the features of claim 12 .
- a melting point of a deposit on at least one paper web contact surface is determined, which is in contact with a paper web running through the dryer section, and a temperature in at least one area of the dryer section is determined as a function controlled or regulated by the at least one determined melting point.
- the invention is based on the finding that deposits on paper web contact surfaces in a dryer section of a paper machine, in particular as a result form that impurities contained in a paper web running through the dryer section melt due to the increased temperature in the dryer 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. Knowing 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 that is fed to the paper machine is produced can change. Therefore, the impurities contained in the paper web running through the dryer section can also change.
- a repeated determination of the melting points of deposits on paper web contact surfaces in the drying section allows an adaptation of the control or regulation of the temperature in the drying section to changing impurities and in particular to changing melting points of these impurities.
- the melting point of a deposit is determined on at least one paper web contact surface which is arranged in an entry area of the dryer section, in which the paper web enters the dryer section.
- This embodiment of the method according to the invention takes into account that the paper web is exposed to a particularly high temperature increase in the entry area of the dryer section and therefore impurities in the paper web especially in the entry area of the drying section.
- the melting point of a deposit on a paper web contact surface is determined, which is arranged in a region of the dryer section in which the temperature of the paper web is increased within the dryer section.
- the melting point of a deposit on at least one paper web contact surface is determined. Drying cylinders in the dryer section are heated (usually with steam) to dry the paper web. Therefore, the temperature of the paper web at a drying cylinder is increased, which can lead to the melting of impurities in the paper web upon contacting the surface of the drying cylinder and the deposition of melted impurities on the surface.
- the melting points of deposits on the surfaces of drying cylinders are preferably determined in the method according to the invention.
- the melting point of a deposit is determined using differential scanning calorimetry (DSC for short).
- the melting point of a deposit is determined using differential thermal analysis (DTA).
- DSC differential scanning calorimetry
- DTA differential thermal analysis
- Differential scanning calorimetry and differential thermal analysis are known methods for the thermal analysis of samples, with which the sample absorbed or released amounts of heat or temperature changes when heated or cooling of the sample in comparison to a reference container or a reference substance, in particular during a phase transition of the sample.
- this method can be used to determine the temperature at which a phase transition of the sample occurs. Therefore, these methods are also suitable for determining the melting point of a deposit on a paper web contact surface in the dryer section.
- a temperature in at least one area of the drying section is controlled or regulated in such a way that the temperature of the paper web in this area does not exceed the determined melting point of a deposit.
- This embodiment of the method according to the invention aims to prevent the melting of impurities in the paper web at least in one area of the dryer section by keeping the temperature in this area below the melting temperature of these impurities.
- 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 dryer section and a temperature in this area is controlled or regulated using the temperature function.
- a temperature in at least one area of the dryer section is set or regulated to a value that is the functional value of the temperature function specified for this area at the point defined by the at least one melting point determined.
- the aforementioned embodiment of the method according to the invention to control or regulate the temperature in at least one area of the drying section using a predetermined temperature function, the temperature in this area as a function of a melting point of a deposit on at least one paper web contact surface.
- the temperature function is defined, for example, by a mathematical model, experimental investigations and/or empirical values. Furthermore, 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 regulation unit that is set up to control or regulate a temperature in at least one area of the dryer section.
- a temperature in at least one area of the drying section is controlled or regulated by heating drying cylinders in 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 usually being heated with steam. Therefore, temperatures in the dryer section can be influenced in particular by changes in the heating of drying cylinders.
- a dryer section of a paper machine comprises a measuring arrangement that is set up to determine a melting point of a deposit on at least one paper web contact surface that is in contact with a paper web running through the dryer section, and a control or regulating unit that is set up to control or regulate a temperature in at least one area of the dryer section as a function of the determined melting point.
- the measuring arrangement and the control or regulating unit enable the method according to the invention for operating the drying section to be carried out with the advantages mentioned above.
- the single figure shows schematically a section of a drying section 1 according to the invention of a paper machine.
- the drying section 1 has several drying cylinders 3 , only one of which 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 heating tongues 7 are designed as steam heating tongues 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 melting disruptive substances 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 set up 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 set up to control or regulate a temperature in at least one area 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, from 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 supplied from the collection container 19 to the measuring arrangement 13 via a supply 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 melting point determined is transmitted to the control or regulating unit 15 .
- a temperature function for the temperature as a function of the melting point of a deposit 11 on at least one paper web contact surface 9 is specified, for example.
- the control or regulating unit 15 sets or regulates the temperature in the area of the drying section 1 to a value which is the functional value of the predetermined temperature function at the point defined by the at least one melting point determined.
- the temperature is controlled or regulated in such a way that it does not exceed a determined melting point.
Landscapes
- Paper (AREA)
Abstract
Description
Claims
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 (de) | 2020-11-09 | 2021-10-14 | Betreiben einer trockenpartie einer papiermaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4211305A1 true EP4211305A1 (de) | 2023-07-19 |
| EP4211305B1 EP4211305B1 (de) | 2025-02-19 |
Family
ID=78463442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21801021.3A Active EP4211305B1 (de) | 2020-11-09 | 2021-10-14 | Betreiben einer trockenpartie einer papiermaschine |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP4211305B1 (de) |
| CN (1) | CN116457530B (de) |
| DE (1) | DE102020214048A1 (de) |
| ES (1) | ES3027614T3 (de) |
| FI (1) | FI4211305T3 (de) |
| WO (1) | WO2022096248A1 (de) |
Family Cites Families (7)
| 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 |
| WO2012055897A1 (de) * | 2010-10-29 | 2012-05-03 | Emtec Electronic Gmbh | Verfahren und vorrichtung zur erkennung von stickyablagerungen bei der papierproduktion |
-
2020
- 2020-11-09 DE DE102020214048.0A patent/DE102020214048A1/de not_active Withdrawn
-
2021
- 2021-10-14 EP EP21801021.3A patent/EP4211305B1/de active Active
- 2021-10-14 CN CN202180075263.7A patent/CN116457530B/zh active Active
- 2021-10-14 FI FIEP21801021.3T patent/FI4211305T3/fi active
- 2021-10-14 ES ES21801021T patent/ES3027614T3/es active Active
- 2021-10-14 WO PCT/EP2021/078515 patent/WO2022096248A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| CN116457530A (zh) | 2023-07-18 |
| CN116457530B (zh) | 2026-02-06 |
| DE102020214048A1 (de) | 2022-05-12 |
| ES3027614T3 (en) | 2025-06-16 |
| WO2022096248A1 (de) | 2022-05-12 |
| FI4211305T3 (fi) | 2025-05-20 |
| EP4211305B1 (de) | 2025-02-19 |
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