EP2418321B1 - Procédé et dispositif de réglage de l'humidité d'une bande de matériau - Google Patents

Procédé et dispositif de réglage de l'humidité d'une bande de matériau Download PDF

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Publication number
EP2418321B1
EP2418321B1 EP20110174640 EP11174640A EP2418321B1 EP 2418321 B1 EP2418321 B1 EP 2418321B1 EP 20110174640 EP20110174640 EP 20110174640 EP 11174640 A EP11174640 A EP 11174640A EP 2418321 B1 EP2418321 B1 EP 2418321B1
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EP
European Patent Office
Prior art keywords
moisture
moistening
moistening device
web
virtual
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.)
Not-in-force
Application number
EP20110174640
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German (de)
English (en)
Other versions
EP2418321A1 (fr
Inventor
Uwe Fetzer
Hartmut Abel
Niels Hardt
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.)
Voith Patent GmbH
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Voith Patent GmbH
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/003—Indicating or regulating the moisture content of the layer

Definitions

  • the invention relates to a method for controlling the final moisture content of a fibrous web, in particular a paper, board or tissue web, during its production in a paper machine with a former section, a press section, a dryer section, a moistening device and a moisture sensor, wherein the moisture in front of the moistening device is regulated by a first web moisture control and the final moisture after the moistening device (5) by a second web moisture control.
  • the invention also relates to a control device for carrying out the method.
  • the known methods and devices of this kind are very complex and use at least two measuring frames with humidity sensors or comparable moisture measuring devices, as in US Pat GB 1430 264 A disclosed for determining the moisture of the fibrous web both before and after the moistening device.
  • the measurement of the moisture before the moistening device is dispensed with. This has the disadvantage that the quality parameters of the fibrous web are subject to fluctuations and the quality of the fibrous web suffers.
  • the object is achieved by a method for controlling the final moisture content of a fibrous web, in particular a paper, board or tissue web, during its production in a paper machine with a former section, a Press section, a dryer section, a moistening device and a humidity sensor, wherein the moisture is controlled before the moistening device by a first web moisture control and the final moisture after the moistening device by a second web moisture control dissolved.
  • the actual value of the moisture of the first web moisture control is determined by a first virtual humidity sensor and the actual value of the final moisture of the second web moisture control after the moistening device is measured by a physical humidity sensor and as a function of a determined by a second virtual humidity sensor virtual actual value of the moisture is controlled in front of the moistening device by changing the moistening effect of the moistening device.
  • the quality of the fibrous web also depends on the moisture level of the fibrous web in front of the moistening device.
  • the moisture of the fibrous web before the moistening device is determined by so-called virtual moisture sensors.
  • the measured quantity determined is not measured directly by means of expensive measuring instruments, but calculated using known process variables.
  • the moisture level of the fibrous web upstream of the moistening device can be adjusted with regard to a constant quality of the fibrous web and also limit the application of water to a minimum. This has the advantage that no drying energy has to be expended for too much applied water.
  • Virtual sensors are often referred to as soft sensors.
  • a soft sensor or virtual sensor can be designed in various ways. It can be based on physical models, statistical models, neural networks or a combination of these models.
  • Another advantage of solution according to the invention lies in a faster stabilization of the moisture profile in the direction of the paper machine. This is particularly advantageous when starting the paper machine or when restarting after a demolition.
  • the moisture control method according to the invention relates to the regulation of the moisture profile of the fibrous web in the machine direction (MD). However, this regulation can be superimposed on a moisture cross profile control (CD).
  • MD machine direction
  • CD moisture cross profile control
  • the first virtual humidity sensor determines the actual value of the humidity from the difference between the measured value for the final moisture of the physical humidity sensor and the desired value difference from the setpoint value of the final moisture after the humidifying device and the desired value of the moisture before the humidifying device.
  • the second virtual humidity sensor determines the virtual actual value of the moisture before the humidifying device from the difference between the humidity applied by the humidifying device and the measured value of the final moisture of the physical humidity sensor.
  • the difference between the desired value of the moisture before the humidifying device and the virtual actual value of the moisture in front of the humidifying device in the second rail moisture control is used to influence the humidifying effect of the humidifying device used.
  • process parameters of the production process in the second web moisture control are used to determine the virtual actual value of the moisture before the moistening device.
  • Another aspect of the invention for solving the problem relates to a control device for carrying out the method according to claim 1, with a first control unit for controlling the humidity before a humidifier and a second control unit for controlling the final moisture after the humidifier and a physical humidity sensor for measuring the final moisture ,
  • the device is characterized in that the first control unit is associated with a first calculation unit for calculating a first virtual actual value of the humidity before the humidification device and that the second control unit has a second calculation unit for calculating a second virtual actual value of the humidity a humidifying device, as well as a connection to the process control system for reading in process parameters.
  • the moistening device is designed as a per se known Düsenbefeuchtungvoriques with a plurality of arranged in rows transversely to the direction of the fibrous web nozzles.
  • a plurality of nozzle rows are provided one behind the other in the running direction of the fibrous web, wherein the nozzles of adjacent rows are arranged offset from one another in the transverse direction. This results in a uniform spray application.
  • the moistening device preferably operates with water and in particular when using multi-substance nozzles, with a water-air mixture. Each nozzle sprays a predetermined amount of water on the fibrous web.
  • the nozzle moistening device may be configured so that each nozzle has the same, constant amount, e.g. Liters per minute, spraying water onto the fibrous web. As a result, the moisture level of the fibrous web is adjusted.
  • the nozzle moistening device is designed such that the water or water-air throughput of the nozzles is adjustable in zones over the width of the fibrous web. As a result, damp streaks in the fibrous web can be corrected. In this case, the zonal different amounts can be superimposed on an adjustable, constant amount.
  • the moistening device may be located inside the dryer section at the end or outside directly after the dryer section.
  • the moisture sensor may be arranged to be stationary or transverse to the running direction of the fibrous web traversing.
  • a part of a paper machine is shown in a schematic representation.
  • the fibrous web is guided by a forming section, not shown, via a press section 3 into and through a drying section 4. Subsequently, it passes through a moistening device 5 before it is wound by the reel 7 to a paper roll.
  • the moistening device 5 is designed as a per se known Düsenbefeuchtungvoriques with a plurality of arranged in rows transversely to the direction of the fibrous web nozzles. Appropriately, a plurality of nozzle rows are provided one behind the other in the running direction of the fibrous web, wherein the nozzles of adjacent rows are arranged offset from one another in the transverse direction. This results in a uniform spray application.
  • the moistening device 5 preferably operates with water and in particular when using multi-substance nozzles, with a water-air mixture. Each nozzle sprays a predetermined amount of water on the fibrous web.
  • the nozzle moistening device may be configured so that each nozzle has the same, constant amount, eg liters per minute, of water on the fibrous web sprayed. As a result, the moisture level of the fibrous web is adjusted.
  • the nozzle moistening device is designed such that the water or water-air throughput of the nozzles is adjustable in zones over the width of the fibrous web. As a result, damp streaks in the fibrous web can be corrected. In this case, the zonal different amounts can be superimposed on an adjustable, constant amount.
  • the moistening device 5 can be arranged inside the dryer section 4 at the end or outside directly after the dryer section 4. Between the reel 7 and the moistening device 5, a moisture sensor 6 is provided for measuring the final moisture content 6.11 of the fibrous web.
  • the moisture sensor may be arranged to be stationary or transverse to the running direction of the fibrous web traversing.
  • To regulate the moisture 6.1 of the fibrous web two web moisture control systems 1, 2 are provided. With the first web moisture control 1, the moisture 6.0 of the fibrous web before the moistening device 5 is regulated to a predefinable humidity setpoint 6.00.
  • the first rail moisture control 1 comprises a humidity control 10, which receives a calculated actual moisture value 6.01 from the humidification device 5 from a calculation unit 15.
  • the calculation unit 15 obtains the final moisture actual value 6.11 from the physical humidity sensor 6. In order to obtain the moisture value 6.01 before the moistening device, the difference between the final moisture reference value 6.10 and the moisture reference value 6.00 before the moistening device 5 is subtracted from the measured final moisture value 6.11. The determination of the humidity setpoint for the humidity control 10 is analogous. In the calculation unit 14, the difference between the final humidity setpoint 6.10 and the humidity setpoint 6.00 is subtracted from the final humidification setpoint 6.10 before the humidification device 5.
  • the second web moisture control 2 regulates the final moisture content 6.1 of the fibrous web.
  • the actual value of the final moisture 6.11 after the moistening device 5 is measured by a physical humidity sensor 6 and regulated in response to a determined by a second virtual sensor virtual actual humidity 6.01 before the moistening 5 by changing the moistening effect of the moistening device 5.
  • the determination of the virtual actual value of the moisture 6.01 before the humidification device 5 takes place in a calculation unit 28 of the control unit 20.
  • the moisture content applied by the humidification device 5 is subtracted from the measured final moisture 6.11. This moisture content is determined by a signal converter 24 from the reported back from the water station 25, actual water consumption and forwarded to the calculation unit 28.
  • process parameters of the manufacturing process from the process control system 27 are taken into account.
  • the effects of moistening and the moisture 6.0 before the moistening device on the quality of the fibrous web at different process parameters in favor of a good and constant quality can be considered.
  • one of the process parameters production speed, web width, tear-off information, steam consumption in the dryer section 4, dewatering conditions in the forming section or press section 3, moisture values of the fibrous web in or after the press section 3 or material properties of the fibrous material are used.
  • the difference between the setpoint value of the humidity 6.00 before the humidifying device 5 and the virtual actual value of the humidity 6.01 is calculated before the humidifying device 5 and fed to the controller 22, which contains a ramp function, as the control variable.
  • the output of the Controller 22 is connected to a signal converter 23, which converts the controller signal into a physical throughput (liters per minute) and controls the water station 25 so that the moistening effect of the moistening device 5 is such that the target / actual deviation of the virtual actual value of the moisture 6.01 is reduced or eliminated.
  • the water station may additionally be connected to a transverse profile control unit 26, which activates the nozzles zonally differently for influencing the moisture transverse profile of the fibrous web.

Landscapes

  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (7)

  1. Procédé de réglage de l'humidité ultime (6.1) d'une bande de matériau fibreux, en particulier d'une bande de papier, carton ou papier essuie-tout lors de sa fabrication dans une machine à papier comportant une partie formage, une partie presse (3), une partie séchage (4), un dispositif de mouillage (5) et un détecteur d'humidité (5), l'humidité (6.0) en amont du dispositif de mouillage (5) étant réglée par un premier système de réglage d'humidité de bande (1) et l'humidité ultime (6.1) en aval du dispositif de mouillage (5) étant réglée par un second système de réglage d'humidité de bande (2), la valeur réelle de l'humidité ultime (6.11) étant mesurée par un détecteur d'humidité physique (6),
    caractérisé en ce que,
    pour le réglage de l'humidité (6.0) en amont du dispositif de mouillage (5), la valeur réelle virtuelle de l'humidité (6.01) du premier système de réglage d'humidité de bande (1) est déterminée par un premier détecteur d'humidité virtuel et la valeur réelle de l'humidité ultime (6.11) du second système de réglage d'humidité de bande (2) en aval du dispositif de mouillage (5) est mesurée par le détecteur d'humidité physique (6) et réglée en fonction d'une valeur réelle déterminée par un second détecteur d'humidité virtuel (6.01) en amont du dispositif de mouillage (5) par modification de l'effet mouillant du dispositif de mouillage (5).
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    le premier détecteur d'humidité virtuel détermine la valeur réelle de l'humidité (6.01) à partir de la différence entre la valeur mesurée pour l'humidité ultime (6.11) du détecteur d'humidité physique (6) et la différence de valeur théorique entre la valeur théorique de l'humidité ultime (6.10) en aval du dispositif de mouillage (5) et la valeur théorique de l'humidité ultime (6.00) en amont du dispositif de mouillage (5).
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    le second détecteur d'humidité virtuel détermine la valeur réelle virtuelle de l'humidité (6.01) en amont du dispositif de mouillage (5) à partir de la différence entre l'humidité appliquée par le dispositif de mouillage (5) et la valeur mesurée d'humidité ultime (6.11) du détecteur d'humidité physique (6).
  4. Procédé selon une des revendications précédentes,
    caractérisé en ce que
    la différence entre la valeur théorique de l'humidité (6.00) en amont du dispositif de mouillage (5) et la valeur réelle virtuelle de l'humidité (6.01) en amont du dispositif de mouillage (5) est utilisée dans le second système de réglage d'humidité de bande (2) pour jouer sur l'effet mouillant du dispositif de mouillage (5).
  5. Procédé selon une des revendications précédentes,
    caractérisé en ce que
    des paramètres de traitement du procédé de fabrication sont utilisés dans le second système de réglage d'humidité de bande (2) pour déterminer la valeur réelle virtuelle de l'humidité (6.01) en amont du dispositif de mouillage (5).
  6. Procédé selon la revendication 5,
    caractérisé en ce
    qu'au moins un des paramètres de procédé suivants : vitesse de production, largeur de bande, informations de déchirement, consommation de vapeur dans la partie séchage (4), conditions de déshydratation dans la partie formage ou partie presse (3), valeurs d'humidité de la bande de matériau fibreux dans ou en aval de la partie presse (3) ou propriétés du matériau fibreux est utilisé.
  7. Dispositif de réglage pour la réalisation du procédé selon la revendication 1, comportant une première unité de réglage (10) pour le réglage de l'humidité (6.01) en amont d'un dispositif de mouillage (5) et une seconde unité de réglage (20) pour le réglage de l'humidité ultime (6.11) en aval du dispositif de mouillage (5) et un détecteur d'humidité physique (6) pour mesurer l'humidité ultime (6.11) ainsi qu'un système conducteur de procédé (27),
    caractérisé en ce
    qu'à la première unité de réglage (10) est associée une première unité de calcul (15) pour le calcul d'une première valeur réelle virtuelle d'humidité (6.01) en amont du dispositif de mouillage (5) et que la seconde unité de réglage (20) comprend une seconde unité de calcul (28) pour le calcul d'une seconde valeur réelle virtuelle d'humidité (6.01) en amont du dispositif de mouillage (5) ainsi qu'une connexion avec le système conducteur de procédé (27) pour la consultation de paramètres de procédé.
EP20110174640 2010-08-09 2011-07-20 Procédé et dispositif de réglage de l'humidité d'une bande de matériau Not-in-force EP2418321B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201010039093 DE102010039093A1 (de) 2010-08-09 2010-08-09 Verfahren und Vorrichtung zur Regelung der Feuchte einer Materialbahn

Publications (2)

Publication Number Publication Date
EP2418321A1 EP2418321A1 (fr) 2012-02-15
EP2418321B1 true EP2418321B1 (fr) 2013-09-11

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EP20110174640 Not-in-force EP2418321B1 (fr) 2010-08-09 2011-07-20 Procédé et dispositif de réglage de l'humidité d'une bande de matériau

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EP (1) EP2418321B1 (fr)
CN (1) CN102373647A (fr)
DE (1) DE102010039093A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103603074A (zh) * 2013-10-24 2014-02-26 南通江潮纤维制品有限公司 用于超吸水纤维的吸湿房及超吸水纤维吸湿工艺
DE102017127932A1 (de) * 2017-11-27 2019-05-29 Voith Patent Gmbh Verfahren

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1430264A (en) * 1972-03-08 1976-03-31 Industrial Nucleonics Corp Control of fibrous sheet making machines
DE19634997C2 (de) * 1996-08-30 1999-08-05 Voith Sulzer Papiermasch Gmbh Regeleinrichtung mit einer Sensoren-Mehrzahl
FI971301A (fi) * 1997-03-27 1998-09-28 Valmet Corp Menetelmä paperin käyristymän hallitsemiseksi paperikoneen kuivatusosalla ja paperi- tai kartonkikone
ATE262614T1 (de) * 1998-07-10 2004-04-15 Metso Paper Inc Verfahren und vorrichtung zur herstellung von oberflächenbehandeltem druckpapier
US6200422B1 (en) * 1999-06-24 2001-03-13 Neles Paper Automation Oy Method and apparatus for controlling a moving paper web
FI115981B (fi) * 2002-06-19 2005-08-31 Metso Paper Inc Menetelmä, järjestelmä ja kalanteri paperirainan kosteusprofiilin ja/tai -gradientin hallitsemiseksi sekä raina
DE10241944A1 (de) * 2002-09-10 2004-03-18 Voith Paper Patent Gmbh Einrichtung und Verfahren zur Herstellung und/oder Behandlung einer Faserstoffbahn
FI119574B (fi) * 2004-11-12 2008-12-31 Metso Paper Inc Menetelmä ja järjestelmä paperikoneessa sekä ohjelmistotuote

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DE102010039093A1 (de) 2012-02-09
EP2418321A1 (fr) 2012-02-15

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