EP4211305B1 - Operation of a dryer section of a paper machine - Google Patents
Operation of a dryer section of a paper machine Download PDFInfo
- 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
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- Prior art keywords
- paper web
- temperature
- melting point
- dryer section
- determined
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- 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
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- 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
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- 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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Description
Die Erfindung betrifft ein Verfahren zum Betreiben einer Trockenpartie einer Papiermaschine.The invention relates to a method for operating a drying section of a paper machine.
Altpapier ist ein wichtiger Rohstoff der Papierproduktion. Um Altpapier für die Papierproduktion aufzubereiten, wird das Altpapier zerfasert und es werden in dem Altpapier enthaltene Störstoffe entfernt und gegebenenfalls Zusatzstoffe hinzugefügt. Für die Zerfaserung wird das Altpapier in der Regel in einem Pulper zu einer Fasersuspension aufgelöst. Störstoffe, die beispielsweise aus Kunststoff, Metall, Glas oder Asche bestehen, werden von den nutzbaren Fasern des Altpapiers bei einer Stoffaufbereitung getrennt. Die aufbereitete Fasersuspension wird einer Papiermaschine zur Papierherstellung zugeführt.Waste paper is an important raw material in paper production. 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. For the shredding, 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.
Beispielsweise offenbart die
Jedoch können bei der Stoffaufbereitung nicht alle im Altpapier enthaltenen Störstoffe von den nutzbaren Fasern des Altpapiers getrennt werden. Ferner wird bei der Stoffaufbereitung oft eine eingeschränkte Entfernung von Störstoffen in Kauf genommen, um bei der Trennung von Fasern und Störstoffen des Altpapiers Faserverluste zu reduzieren. Dadurch bleiben Störstoffe wie Stärke, Binder oder Aschen an den Fasern haften. Teilweise werden auch Störstoffe im engen Wasserkreislauf der Papierproduktion zunächst von Fasern gelöst, kommen jedoch später wieder mit Fasern in Verbindung. In jedem Fall gelangen Störstoffe bis zur Papiermaschine.However, during stock preparation, not all of the contaminants contained in the waste paper can be separated from the usable fibers of the waste paper. Furthermore, during stock preparation, a limited removal of contaminants is often accepted in order to reduce fiber losses when separating fibers and contaminants in the waste paper. As a result, contaminants such as starch, binders or ash stick to the fibers. In some cases, contaminants are initially released from fibers in the tight water cycle of paper production, but later come back into contact with fibers. In any case, contaminants reach the paper machine.
Diese Störstoffe verbleiben zu einem Teil im produzierten Papier und können die Qualität des Papiers mindern. Ein anderer Teil der Störstoffe lagert sich klebend an Papierbahnkontaktflächen ab, die in einer Trockenpartie der Papiermaschine in Kontakt mit einer die Trockenpartie durchlaufenden Papierbahn stehen. Derartige Papierbahnkontaktflächen sind insbesondere Oberflächen von Trockenzylindern, über die die Papierbahn in der Trockenpartie geführt wird. Diese Ablagerungen können von der Papierbahn mitgerissen werden und Papierbahnabrisse verursachen, die wiederum Stillstände der Papierproduktion nach sich ziehen, und/oder die Qualität des produzierten Papiers beeinträchtigen.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.
Um derartigen Ablagerungen zu begegnen, werden beispielsweise Schaber an die Oberflächen von Trockenzylindern gestellt, um Ablagerungen von den Oberflächen abzukratzen und Auffangbehältern zuzuführen. Es kommt jedoch häufig vor, dass sich an einem derartigen Schaber Ablagerungen aufbauen, statt in einen Auffangbehälter zu fallen. In diesem Fall müssen die Schaber gewechselt werden.To combat such deposits, for example, scrapers are placed on the surfaces of drying cylinders to scrape deposits from the surfaces and feed them into collecting containers. However, it often happens that deposits build up on such a scraper instead of falling into a collecting container. In this case, the scrapers must be replaced.
Der Erfindung liegt die Aufgabe zugrunde, Ablagerungen von Störstoffen an Papierbahnkontaktflächen in der Trockenpartie einer Papiermaschine zu reduzieren.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.
Die Aufgabe wird erfindungsgemäß durch ein Verfahren mit den Merkmalen des Anspruchs 1 und durch eine Trockenpartie mit den Merkmalen des Anspruchs 12 gelöst.The object is achieved according to the invention by a method having the features of
Vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Advantageous embodiments of the invention are the subject of the subclaims.
Bei dem erfindungsgemäßen Verfahren zum Betreiben einer Trockenpartie einer Papiermaschine wird ein Schmelzpunkt einer Ablagerung an wenigstens einer Papierbahnkontaktfläche ermittelt, die in der Trockenpartie in Kontakt mit einer die Trockenpartie durchlaufenden Papierbahn steht, und es wird eine Temperatur in wenigstens einem Bereich der Trockenpartie in Abhängigkeit von dem wenigstens einen ermittelten Schmelzpunkt gesteuert oder geregelt.In the method according to the invention for operating a drying section of a paper machine, 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.
Der Erfindung liegt die Erkenntnis zugrunde, dass sich Ablagerungen an Papierbahnkontaktflächen in einer Trockenpartie einer Papiermaschine insbesondere dadurch bilden, dass in einer die Trockenpartie durchlaufenden Papierbahn enthaltene Störstoffe aufgrund der erhöhten Temperatur in der Trockenpartie schmelzen und nachfolgend an Papierbahnkontaktflächen kleben bleiben. Daher sieht das erfindungsgemäße Verfahren vor, einen Schmelzpunkt einer Ablagerung an wenigstens einer Papierbahnkontaktfläche zu ermitteln. Die Kenntnis des Schmelzpunktes ermöglicht, eine Temperatur in der Trockenpartie in Abhängigkeit von dem ermittelten Schmelzpunkt zu steuern oder zu regeln, so dass ein Schmelzen von Störstoffen in der Trockenpartie und dadurch Ablagerungen an Papierbahnkontaktflächen der Trockenpartie reduziert werden können.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.
Bei einer Ausgestaltung des erfindungsgemäßen Verfahrens wird der Schmelzpunkt einer Ablagerung an wenigstens einer Papierbahnkontaktfläche wiederholt ermittelt. Diese Ausgestaltung des erfindungsgemäßen Verfahrens berücksichtigt, dass sich die Zusammensetzung des Altpapiers, aus dem die Fasersuspension erzeugt wird, die der Papiermaschine zugeführt wird, ändern kann. Daher können sich auch die Störstoffe ändern, die in der die Trockenpartie durchlaufenden Papierbahn enthalten sind. Eine wiederholte Bestimmung der Schmelzpunkte von Ablagerungen an Papierbahnkontaktflächen in der Trockenpartie ermöglicht eine Anpassung der Steuerung oder Regelung der Temperatur in der Trockenpartie an sich ändernde Störstoffe und insbesondere an sich ändernde Schmelzpunkte dieser Störstoffe.In one embodiment of the method according to the invention, 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.
Bei einer weiteren Ausgestaltung des erfindungsgemäßen Verfahrens wird der Schmelzpunkt einer Ablagerung an wenigstens einer Papierbahnkontaktfläche ermittelt, die in einem Eingangsbereich der Trockenpartie angeordnet ist, in dem die Papierbahn in die Trockenpartie einläuft. Diese Ausgestaltung des erfindungsgemäßen Verfahrens berücksichtigt, dass die Papierbahn im Eingangsbereich der Trockenpartie einer besonders großen Temperaturerhöhung ausgesetzt ist und daher Störstoffe in der Papierbahn insbesondere in dem Eingangsbereich der Trockenpartie schmelzen.In a further embodiment of the method according to the invention, 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. This embodiment of the method according to the invention takes into account that the paper web is exposed to a particularly large increase in temperature in the entrance area of the drying section and therefore impurities in the paper web melt, in particular in the entrance area of the drying section.
Bei einer weiteren Ausgestaltung des erfindungsgemäßen Verfahrens wird der Schmelzpunkt einer Ablagerung an einer Papierbahnkontaktfläche ermittelt, die in einem Bereich der Trockenpartie angeordnet ist, in dem die Temperatur der Papierbahn innerhalb der Trockenpartie erhöht wird. Diese Ausgestaltung des erfindungsgemäßen Verfahrens berücksichtigt, dass auch Temperaturerhöhungen der Papierbahn innerhalb der Trockenpartie zum Schmelzen von Störstoffen in der Papierbahn führen können.In a further embodiment of the method according to the invention, 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. This embodiment of the method according to the invention takes into account that temperature increases of the paper web within the drying section can also lead to the melting of contaminants in the paper web.
Bei einer weiteren Ausgestaltung des erfindungsgemäßen Verfahrens wird der Schmelzpunkt einer Ablagerung an wenigstens einer Papierbahnkontaktfläche ermittelt, die eine Oberfläche eines Trockenzylinders ist. Trockenzylinder in der Trockenpartie werden (in der Regel mit Dampf) beheizt, um die Papierbahn zu trocknen. Daher wird die Temperatur der Papierbahn an einem Trockenzylinder erhöht, was zum Schmelzen von Störstoffen in der Papierbahn beim Kontaktieren der Oberfläche des Trockenzylinders und zu Ablagerungen geschmolzender Störstoffe an der Oberfläche führen kann. Daher werden bei dem erfindungsgemäßen Verfahren vorzugsweise Schmelzpunkte von Ablagerungen an den Oberflächen von Trockenzylindern ermittelt.In a further embodiment of the method according to the invention, the melting point of a deposit on at least one paper web contact surface, which is a surface of a drying cylinder, is determined. Drying cylinders in the drying section are heated (usually with steam) in order to dry the paper web. Therefore, 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.
Bei einer weiteren Ausgestaltung des erfindungsgemäßen Verfahrens wird der Schmelzpunkt einer Ablagerung mit einer dynamischen Differenzkalorimetrie (engl. Differential Scanning Calorimetry, abgekürzt DSC) ermittelt. Alternativ oder zusätzlich wird der Schmelzpunkt einer Ablagerung mit einer Differenzthermoanalyse (engl. Differential Thermal Analysis, abgekürzt DTA) ermittelt. Die dynamische Differenzkalorimetrie und die Differenzthermoanalyse sind bekannte Verfahren zur thermischen Analyse von Proben, mit denen von der Probe aufgenommene oder abgegebene Wärmemengen beziehungsweise Temperaturänderungen bei Erwärmung oder Abkühlung der Probe im Vergleich zu einem Referenzbehälter beziehungsweise einer Referenzsubstanz, insbesondere bei einem Phasenübergang der Probe, ermittelt werden. Insbesondere kann durch diese Verfahren die Temperatur ermittelt werden, bei der ein Phasenübergang der Probe eintritt. Daher eignen sich diese Verfahren auch zum Bestimmen des Schmelzpunktes einer Ablagerung an einer Papierbahnkontaktfläche in der Trockenpartie.In a further embodiment of the method according to the invention, the melting point of a deposit is determined using differential scanning calorimetry (DSC). Alternatively or in addition, the melting point of a deposit is determined using differential thermal analysis (DTA). 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.
Bei einer weiteren Ausgestaltung des erfindungsgemäßen Verfahrens wird eine Temperatur in wenigstens einem Bereich der Trockenpartie derart gesteuert oder geregelt, dass die Temperatur der Papierbahn in diesem Bereich den ermittelten Schmelzpunkt einer Ablagerung nicht überschreitet. Diese Ausgestaltung des erfindungsgemäßen Verfahrens zielt darauf, ein Schmelzen von Störstoffen in der Papierbahn wenigstens in einem Bereich der Trockenpartie zu verhindern, indem die Temperatur in diesem Bereich unterhalb der Schmelztemperatur dieser Störstoffe gehalten wird.In a further embodiment of the method according to the invention, 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.
Bei einer weiteren Ausgestaltung des erfindungsgemäßen Verfahrens wird für wenigstens einen Bereich der Trockenpartie eine Temperaturfunktion für eine Temperatur in Abhängigkeit von dem Schmelzpunkt einer Ablagerung an wenigstens einer Papierbahnkontaktfläche vorgegeben und eine Temperatur in diesem Bereich wird anhand der Temperaturfunktion gesteuert oder geregelt. Beispielsweise wird eine Temperatur in wenigstens einem Bereich der Trockenpartie auf einen Wert eingestellt oder geregelt, der der Funktionswert der für diesen Bereich vorgegebenen Temperaturfunktion an der durch den wenigstens einen ermittelten Schmelzpunkt definierten Stelle ist.In a further embodiment of the method according to the invention, 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. For example, 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.
Mit anderen Worten sieht die vorgenannte Ausgestaltung des erfindungsgemäßen Verfahrens vor, die Temperatur in wenigstens einem Bereich der Trockenpartie anhand einer vorgegebenen Temperaturfunktion zu steuern oder zu regeln, die eine Temperatur in diesem Bereich in Abhängigkeit von einem Schmelzpunkt einer Ablagerung an wenigstens einer Papierbahnkontaktfläche vorgibt. Die Temperaturfunktion wird beispielsweise durch ein mathematisches Modell, experimentelle Untersuchungen und/oder Erfahrungswerte festgelegt. Ferner kann die Temperaturfunktion auch durch maschinelles Lernen erzeugt und verbessert werden. Die Temperaturfunktion wird beispielsweise in einer Speichereinheit einer Steuer- oder Regeleinheit hinterlegt, die eingerichtet ist, eine Temperatur in wenigstens einem Bereich der Trockenpartie zu steuern oder zu regeln.In other words, 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. 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 regulating unit that is set up to control or regulate a temperature in at least one area of the drying section.
Bei einer weiteren Ausgestaltung des erfindungsgemäßen Verfahrens wird eine Temperatur in wenigstens einem Bereich der Trockenpartie durch eine Beheizung von Trockenzylindern der Trockenpartie gesteuert oder geregelt. Diese Ausgestaltung des erfindungsgemäßen Verfahrens nutzt aus, dass eine Trockenpartie beheizbare Trockenzylinder zum Trocknen einer Papierbahn aufweist, wobei die Trockenzylinder in der Regel mit Dampf beheizt werden. Daher können Temperaturen in der Trockenpartie insbesondere durch Änderungen der Beheizung von Trockenzylindern beeinflusst werden.In a further embodiment of the method according to the invention, 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.
Eine erfindungsgemäße Trockenpartie einer Papiermaschine umfasst eine Messanordnung, die eingerichtet ist, einen Schmelzpunkt einer Ablagerung an wenigstens einer Papierbahnkontaktfläche, die in der Trockenpartie in Kontakt mit einer durch die Trockenpartie durchlaufenden Papierbahn steht, zu ermitteln, und eine Steuer- oder Regeleinheit, die eingerichtet ist, eine Temperatur in wenigstens einem Bereich der Trockenpartie in Abhängigkeit von dem ermittelten Schmelzpunkt zu steuern oder zu regeln.A drying section of a paper machine according to the invention 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.
Die Messanordnung und die Steuer- oder Regeleinheit ermöglichen die Durchführung des erfindungsgemäßen Verfahrens zum Betreiben der Trockenpartie mit den oben genannten Vorteilen.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.
Die oben beschriebenen Eigenschaften, Merkmale und Vorteile dieser Erfindung sowie die Art und Weise, wie diese erreicht werden, werden klarer und deutlicher verständlich im Zusammenhang mit der folgenden Beschreibung von Ausführungsbeispielen, die im Zusammenhang mit der Zeichnung näher erläutert werden.The above-described properties, features and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more clearly understood in connection with the following description of embodiments, which are explained in more detail in connection with the drawings.
Dabei zeigt die einzige Figur schematisch einen Abschnitt einer erfindungsgemäßen Trockenpartie 1 einer Papiermaschine. Die Trockenpartie 1 weist mehrere Trockenzylinder 3 auf, von denen in der Figur nur einer gezeigt ist. Über die Trockenzylinder 3 wird eine Papierbahn 5 geführt. Die Trockenzylinder 3 sind jeweils durch eine Beheizung 7 beheizbar, um die Papierbahn 5 zu trocknen. Beispielsweise sind die Beheizungen 7 als Dampfbeheizungen ausgebildet, durch die den Trockenzylindern 3 Dampf zuführbar ist.The single figure shows a schematic section of a
In der Trockenpartie 1 können sich an Papierbahnkontaktflächen 9, die in Kontakt mit der Papierbahn 5 stehen, Ablagerungen 11 bilden, die insbesondere durch Schmelzen in der Papierbahn 5 enthaltener Störstoffe entstehen und an Papierbahnkontaktflächen 9 kleben bleiben. Derartige Papierbahnkontaktflächen 9 sind insbesondere die Oberflächen von Trockenzylindern 3.In the
Die Trockenpartie 1 umfasst eine Messanordnung 13, die eingerichtet ist, einen Schmelzpunkt einer Ablagerung an wenigstens einer Papierbahnkontaktfläche 9 zu ermitteln, die eine Oberfläche eines Trockenzylinders 3 ist. Ferner umfasst die Trockenpartie 1 eine Steuer- oder Regeleinheit 15, die eingerichtet ist, eine Temperatur in wenigstens einem Bereich der Trockenpartie 1 in Abhängigkeit von dem ermittelten Schmelzpunkt zu steuern oder zu regeln. Dabei wird von der Steuer- oder Regeleinheit 15 die Beheizung 7 wenigstens eines Trockenzylinders 3 gesteuert oder geregelt.The
In dem dargestellten Ausführungsbeispiel ist ein Schaber 17 an die Oberfläche eines Trockenzylinders 3 gestellt, von dem Ablagerungen 11 von der Oberfläche des Trockenzylinders 3 abgekratzt und einem Auffangbehälter 19 zugeführt werden. Aus dem Auffangbehälter 19 wird der Messanordnung 13 über eine Zuführungsleitung 21, beispielsweise über einen Schlauch, eine Probe einer derartigen Ablagerung 11 zugeführt. Von der Messanordnung 13 wird der Schmelzpunkt der Ablagerung 11 bestimmt. Beispielsweise wird der Schmelzpunkt der Ablagerung 11 von der Messanordnung 13 mit einer dynamischen Differenzkalorimetrie oder mit einer Differenzthermoanalyse ermittelt. Der ermittelte Schmelzpunkt wird der Steuer- oder Regeleinheit 15 übermittelt.In the embodiment shown, a
Um die Temperatur in einem Bereich der Trockenpartie 1 zu steuern oder zu regeln, wird beispielsweise eine Temperaturfunktion für die Temperatur in Abhängigkeit von dem Schmelzpunkt einer Ablagerung 11 an wenigstens einer Papierbahnkontaktfläche 9 vorgegeben. Von der Steuer- oder Regeleinheit 15 wird die Temperatur in dem Bereich der Trockenpartie 1 dann auf einen Wert eingestellt oder geregelt, der der Funktionswert der vorgegebenen Temperaturfunktion an der durch den wenigstens einen ermittelten Schmelzpunkt definierten Stelle ist. Beispielsweise wird die Temperatur dabei derart gesteuert oder geregelt, dass sie einen ermittelten Schmelzpunkt nicht übersteigt.In order to control or regulate the temperature in an area of the
Obwohl die Erfindung im Detail durch bevorzugte Ausführungsbeispiele näher illustriert und beschrieben wurde, so ist die Erfindung nicht durch die offenbarten Beispiele eingeschränkt und andere Variationen können vom Fachmann hieraus abgeleitet werden, ohne den Schutzumfang der Erfindung zu verlassen.Although the invention has been illustrated and described in detail by preferred embodiments, the invention is not limited to the disclosed examples and other variations may be devised by those skilled in the art. derived from this without departing from the scope of the invention.
Claims (12)
- Method for operating a dryer section (1) of a paper machine, wherein- a melting point of a deposit (11) is determined on at least one paper web contact surface (9) which in the dryer section (1) is in contact with a paper web (5) running through the dryer section (1); and- a temperature in at least one region of the dryer section (1) is controlled in an open or closed loop as a function of the at least one determined melting point.
- Method according to Claim 1, wherein the melting point of a deposit (11) on at least one paper web contact surface (9) is determined repeatedly.
- Method according to Claim 1 or 2, wherein the melting point of a deposit (11) is determined on at least one paper web contact surface (9) which is arranged in an entry region of the dryer section (1) in which the paper web (5) enters the dryer section (1) .
- Method according to one of the preceding claims, wherein the melting point of a deposit (11) is determined on a paper web contact surface (9) which is arranged in a region of the dryer section (1) in which the temperature of the paper web (5) within the dryer section (1) is increased.
- Method according to one of the preceding claims, wherein the melting point of a deposit (11) is determined on at least one paper web contact surface (9) which is a surface of a drying cylinder (3).
- Method according to one of the preceding claims, wherein the melting point of a deposit (11) is determined using a dynamic differential calorimetry.
- Method according to one of the preceding claims, wherein the melting point of a deposit (11) is determined using a differential thermal analysis.
- Method according to one of the preceding claims, wherein a temperature in at least one region of the dryer section (1) is controlled in an open or closed loop in such a manner that the temperature of the paper web (5) in this region does not exceed the determined melting point of a deposit (11).
- Method according to one of the preceding claims, wherein for at least one region of the dryer section (1) a temperature function for a temperature is specified as a function of the melting point of a deposit (11) on at least one paper web contact surface (9), and a temperature in this region is controlled in an open or closed loop by means of the temperature function.
- Method according to Claim 9, wherein a temperature in at least one region of the dryer section (1) is set or controlled in a closed loop to a value which is the functional value of the temperature function specified for this region at the point defined by the at least one determined melting point.
- Method according to one of the preceding claims, wherein a temperature in at least one region of the dryer section (1) is controlled in an open or closed loop by heating (7) at least one drying cylinder (3) of the dryer section (1).
- Dryer section (1) of a paper machine, the dryer section (1) comprising- a measuring assembly (13) which is designed to determine a melting point of a deposit (11) on at least one paper web contact surface (9) which in the dryer section (1) is in contact with a paper web (5) running through the dryer section (1); and- an open-loop or closed-loop control unit (15) which is specified to control in an open or closed loop a temperature in at least one region of the dryer section (1) as a function of the melting point determined.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020214048.0A DE102020214048A1 (en) | 2020-11-09 | 2020-11-09 | Operating a dryer section of a paper machine |
| PCT/EP2021/078515 WO2022096248A1 (en) | 2020-11-09 | 2021-10-14 | Operation of a dryer section of a paper machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4211305A1 EP4211305A1 (en) | 2023-07-19 |
| EP4211305B1 true EP4211305B1 (en) | 2025-02-19 |
Family
ID=78463442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21801021.3A Active EP4211305B1 (en) | 2020-11-09 | 2021-10-14 | Operation of a dryer section of a paper machine |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP4211305B1 (en) |
| CN (1) | CN116457530A (en) |
| DE (1) | DE102020214048A1 (en) |
| ES (1) | ES3027614T3 (en) |
| FI (1) | FI4211305T3 (en) |
| WO (1) | WO2022096248A1 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1194692B (en) * | 1961-12-22 | 1965-06-10 | Siemens Ag | Temperature control device for the drying cylinder of a paper machine |
| US4016030A (en) | 1975-01-29 | 1977-04-05 | Fort Howard Paper Company | Calendering paper containing thermoplastic contaminants |
| DE19736847A1 (en) | 1997-08-23 | 1999-02-25 | Voith Sulzer Papiermasch Gmbh | Paper or cardboard web cleaner |
| DE102004037215A1 (en) | 2004-07-30 | 2006-03-23 | Voith Paper Patent Gmbh | Process for cleaning the surfaces of rolls |
| US7735435B2 (en) * | 2006-05-24 | 2010-06-15 | Diamond Power International, Inc. | Apparatus for cleaning a smelt spout of a combustion device |
| FI121938B3 (en) * | 2007-10-01 | 2012-02-29 | Kemira Oyj | Procedure for controlling the formation of deposits |
| DE102011085220A1 (en) * | 2010-10-29 | 2012-05-03 | Emtec Electronic Gmbh | Method and device for detecting sticky deposits during paper production |
-
2020
- 2020-11-09 DE DE102020214048.0A patent/DE102020214048A1/en not_active Withdrawn
-
2021
- 2021-10-14 EP EP21801021.3A patent/EP4211305B1/en active Active
- 2021-10-14 FI FIEP21801021.3T patent/FI4211305T3/en active
- 2021-10-14 WO PCT/EP2021/078515 patent/WO2022096248A1/en not_active Ceased
- 2021-10-14 CN CN202180075263.7A patent/CN116457530A/en active Pending
- 2021-10-14 ES ES21801021T patent/ES3027614T3/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DE102020214048A1 (en) | 2022-05-12 |
| FI4211305T3 (en) | 2025-05-20 |
| ES3027614T3 (en) | 2025-06-16 |
| CN116457530A (en) | 2023-07-18 |
| EP4211305A1 (en) | 2023-07-19 |
| WO2022096248A1 (en) | 2022-05-12 |
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