EP2100997A2 - Machine de fabrication et/ou de traitement d'une bande de matière fibreuse - Google Patents

Machine de fabrication et/ou de traitement d'une bande de matière fibreuse Download PDF

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Publication number
EP2100997A2
EP2100997A2 EP08171275A EP08171275A EP2100997A2 EP 2100997 A2 EP2100997 A2 EP 2100997A2 EP 08171275 A EP08171275 A EP 08171275A EP 08171275 A EP08171275 A EP 08171275A EP 2100997 A2 EP2100997 A2 EP 2100997A2
Authority
EP
European Patent Office
Prior art keywords
press
machine according
press section
regulating device
control
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.)
Withdrawn
Application number
EP08171275A
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German (de)
English (en)
Other versions
EP2100997A3 (fr
Inventor
Markus Dr. Schoisswohl
Andreas Dr. Eichler
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
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2100997A2 publication Critical patent/EP2100997A2/fr
Publication of EP2100997A3 publication Critical patent/EP2100997A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/06—Means for regulating the pressure
    • 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 machine for producing and / or treating a fibrous web, in particular paper or board web, with a press section comprising a plurality of press nips.
  • dewatering in a press depends on the applied pressure, speed and paper grade, which means that under most operating conditions the Niplast is set too high for the required moisture and moisture content. While dewatering above certain pressures is essentially no longer increasing, the energy consumption of the press and wear are directly dependent on the applied nip loads.
  • the invention has for its object to provide an improved machine of the type mentioned, with the energy consumption can be reduced to a minimum, especially in the press section without affecting the quality of the fibrous web.
  • a control and / or regulating device which is designed so that the individual pressing effects of at least a portion of the press nips of the press section as a function of a predeterminable total pressing action, in particular depending on a predetermined target total pressing action of the press section are adjustable.
  • the press nip load can be reduced to the minimum required to achieve a certain quality of the fibrous web.
  • a certain moisture of the fibrous web produced can be achieved with a minimum press nip.
  • the energy consumption of the press or press section is thus reduced to a minimum.
  • the felts are less squeezed, whereby their life is increased accordingly.
  • the various press parts (for example, sheath) are subject to less wear, whereby their life is increased again accordingly.
  • the volume of the end product in question can be substantially increased, which is particularly important for cardboard.
  • control and / or regulating device is designed so that a predetermined target total pressing action, viewed in the web running direction and / or in the cross machine direction, is compared with a particular online determined total actual pressing effect and the individual pressing effects of the respective press nips as a function of the difference be set between the predetermined target total pressing effect and the determined actual total pressing effect.
  • control and / or regulating device is designed such that the individual pressing effects of at least part of the press nips of the press section are influenced by predefinable weighting factors.
  • preference is given to the individual pressing except for the pressing action of the last press nip in the web running direction Pressing effects of all press nips of the press section influenced by specifiable weight factors.
  • the weighting factors can be fixed, for example.
  • the weighting factors determined for the various press nips can be predetermined depending on the operating state of the respective press, the respective felt moisture, the respective type of felt, the particular felt age, the type of paper, the weight per unit area and / or the like.
  • control and / or regulating device is designed so that the weighting factors are optimized, in particular online, with a view to achieving the lowest possible total pressing effect.
  • control and / or regulating device may in particular be designed so that the weighting factors are advantageously optimized online with a view to minimizing the overall resulting in the press section pressing work.
  • the absolute line force, the force related to the maximum force, the absolute pressure, the pressure related to the maximum pressure and / or the like may be selected as a measure of the pressing work per press nip passage.
  • control and / or regulating device comprises means for compensating for changes in the operating state of the machine, in particular means for Compensation for changes in machine speed, paper grade, basis weight, press condition, felt moisture, felt type, felt age, and / or the like.
  • control and / or regulating device comprises a model scaling.
  • An advantageous embodiment of the machine according to the invention is characterized in that a device for measuring the actual moisture content of the fibrous web in the web running direction behind the press section is provided, that the target total pressing effect in dependence on a nominal moisture of the fibrous web in the area behind the Press section is selected and that the actual total pressing effect is selected as a function of the measured actual moisture content of the fibrous web.
  • the device for measuring the actual moisture content of the fibrous web is preferably arranged immediately after the press section.
  • the desired total pressing action is selected as a function of a desired dewatering amount of the press section and the actual total pressing action as a function of the actual dewatering amount of the press section.
  • the desired total pressing action is selected as a function of a plurality of variables such as, in particular, the amount of dewatering, the change in humidity of the fibrous web, the change in humidity of a particular felt and / or the like and means for measuring the actual total pressing effect. Values of the respective sizes are provided.
  • the tax and / or Control means comprise in particular means to at least partially weight the different sizes for determining the target total pressing effect or the actual total pressing effect differently.
  • the control and / or regulating device may in particular comprise a PI controller.
  • control and / or regulating device comprises a fuzzy controller.
  • control and / or regulating device is designed such that it determines the individual pressing effects of at least part of the press nips of the press section on the basis of a prediction of a maximum energy saving Niplast distribution which can be predefined, in particular, online Drainage influenced.
  • the control and / or regulating device preferably comprises a moisture content controller in order to set a predeterminable moisture content of the fibrous web after the press section via a corresponding adjustment of the pressing action of at least one press nip of the press section.
  • the moisture content controller is expediently designed so that the pressing action of at least a portion of the press nips of the press section can be influenced via predeterminable weighting factors.
  • the moisture content controller is designed so that, apart from the pressing action of the last press nip, as viewed in the web running direction, the pressing action of all press nips of the press section can be influenced by predeterminable weighting factors.
  • the moisture content controller is designed such that it determines the pressing action of at least part of the press nips of the press section on the basis of a prediction of a maximum energy saving Niplast distribution for a predefinable drainage or, in particular, online. influenced a specified moisture content.
  • a moisture content controller which receives the moisture either from a moisture measuring device arranged directly behind the press or press section or, for example, from a moisture measuring device after the subsequent drying group.
  • Fig. 1 shows a schematic partial view of a double felted tandem NipcoFlex press 10 comprehensive press section 12 of a machine for producing and / or treating a fibrous web, which is in the present case, for example, a paper or board web.
  • the press section 12 or tandem NipcoFlex press 10 comprises a plurality of press nips 14, 16.
  • the relevant machine comprises a control and / or regulating device 18.
  • the press section 12 need not necessarily comprise such a tandem NipcoFlex press 10. This is only given as an example here. Generally, the press section 12 may comprise one or more press nips.
  • the control and / or regulating device 18 is designed so that the individual pressing effects of at least a portion of the press nips 14, 16 of the press section 12 in response to a predetermined total pressing action, in particular depending on a predetermined target total pressing action of the press section 12 are adjustable.
  • Fig. 2 shows a simplified schematic partial representation of an exemplary control and / or regulating device for example, a tandem NipcoFlex press 10th
  • Nipco-P-roll 20 there are in the Fig. 2 to recognize a so-called Nipco-P-roll 20 and a so-called NipcoFlex roll 22, in the present case, the NipcoFlex roll 22 is arranged below.
  • the pressing action in the nip formed between the two rolls 20, 22 can be influenced by supporting elements 24 and 26 assigned via the rolls 20, 22, which can be acted upon correspondingly by the control and / or regulating device 18.
  • the support elements 24 of the upper roller 20 are driven together in the present case. With the control of these upper support members 24 and the central support members 26 of the lower roller 22 can be controlled accordingly. In contrast, in the present embodiment, the edge-side support members 26 'of the lower roller 22 are controlled separately from the central support elements. However, the support elements 24, 26 or zones with support elements can also be controlled individually, so that the Pressing action in the cross machine direction by means of the control and regulating device 18 can be influenced.
  • Fig. 3 shows a schematic simplified representation of an embodiment of a controller 28 of the control and / or regulating device 18th
  • This controller 28 can be supplied as input signals, for example, a target total pressing effect and an actual total pressing effect, in the present case, the target total pressing effect, for example, based on a target total moisture and the actual total pressing effect, for example, based on a measured actual moisture of the fibrous web.
  • the controller 28 includes a controller 30, which is provided here for example as a PI controller. Basically, for example, a fuzzy controller is conceivable.
  • the controller 28 sets the loads of the individual press nips based on the measured humidity after the press section 12 and the difference with the setpoint.
  • the controller 28 provided, for example, as a moisture controller, it acts on all nips, with the exception of the last nip considered in the web running direction, with predeterminable weighting factors.
  • the controller 28 may influence the individual nip loads based on an online optimization algorithm that makes a prediction of, for example, a maximum energy savings associated with maximum energy savings for a given dewatering or moisture content.
  • the controller 28 includes, as already mentioned, a controller 30, which may be, for example, a standard PI controller, the response time of this controller is for example in the minute range.
  • the controller 28 is based in the present embodiment on a model scaling, for example, the nonlinearity of the control loop into account (see also Fig. 4 ).
  • control and / or regulating device 18 may be designed such that a predefinable desired total pressing effect is compared with an actual overall pressure determined in particular online, and the individual pressing effects of the relevant press nips as a function of the difference between the predefinable desired total pressing effect and the determined actual total pressure effect can be adjusted.
  • the controller 28 and the respective control and / or regulating device 18 may be designed so that the individual pressing effects of at least a portion of the press nips 14, 16 of the press section 12 (see also Fig. 1 and 2 ) are influenced by specifiable weight factors.
  • the weight factors can be fixed. However, it is also possible in particular for the weighting factors determined for the various press nips 14, 16 to be predeterminable depending on the operating state of the particular press, the respective felt moisture, the respective type of felt, the particular felt age, the type of paper, the basis weight and / or the like ,
  • the weighting factors can be optimized online with regard to the lowest possible total pressing effect.
  • the weighting factors in particular with regard to minimizing the be optimized overall in the press section 12 resulting press work.
  • the absolute line force, the force related to the maximum force, the absolute pressure, the pressure related to the maximum pressure and / or the like can be selected as a measure of the pressing work per press nip passage.
  • controller 18 and controller 28 may also include means for compensating for changes in the operating condition of the machine, particularly means for compensating for changes in machine speed, paper grade, basis weight, condition of a particular press, the Felt moisture, felt type, felt age and / or the like.
  • control and / or regulating device 18 or the controller 28 may also include a model scaling.
  • a device for measuring the actual moisture content of the fibrous web in the web running direction behind the press section 12 can be provided.
  • the desired total pressing effect for example, depending on a desired moisture content of the pulp in the area concerned can be selected behind the press section 12, while the actual total pressing effect of the measured actual moisture of the web depends.
  • the device for measuring the actual moisture is preferably provided immediately after the press section 12.
  • the desired overall pressing action may in particular also be selected as a function of a desired dewatering quantity of the press section 12, while the actual total pressing effect is selected as a function of the actual amount of dewatering of the press section 12.
  • control and / or regulating device 18 or the controller 28 may moreover comprise means for weighting, at least in part, differently, the various variables for determining the desired total pressing effect or the actual total pressing effect.
  • the controller 28 may be e.g. to act a moisture content controller, by a corresponding adjustment of the pressing action of at least one of the press nips 14, 16 of the press section 12 a specifiable moisture content of the fibrous web after the press section 12 is adjustable.
  • the moisture content controller may in particular be designed so that the pressing action of at least a portion of the press nips 14, 16 of the press section 12 can be influenced via predeterminable weighting factors.
  • Fig. 4 shows a diagram in which, for example, for a shoe press profile (profile A) and a shoe press profile with rewet (profile B), the dry content T is shown above the pressing pulse.
  • the resulting nonlinearity of the control loop can be determined, for example, by the model scaling of the controller 28 (cf. Fig. 3 ).
  • the respective machine speed and paper grade compensation may be based on a spreadsheet format or an N-dimensional neural network, allowing the controller 28 to be easily set for the correct work area.
  • a feed forward estimation and feedback on the basis of an algorithm implemented in the control and / or regulating device 18 or controller 28 may be used the humidity measurement, the press nips are controlled or regulated.

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  • Paper (AREA)
EP08171275A 2008-03-11 2008-12-11 Machine de fabrication et/ou de traitement d'une bande de matière fibreuse Withdrawn EP2100997A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810000597 DE102008000597A1 (de) 2008-03-11 2008-03-11 Maschine zur Herstellung und/oder Behandlung einer Faserstoffbahn

Publications (2)

Publication Number Publication Date
EP2100997A2 true EP2100997A2 (fr) 2009-09-16
EP2100997A3 EP2100997A3 (fr) 2012-04-04

Family

ID=40790459

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08171275A Withdrawn EP2100997A3 (fr) 2008-03-11 2008-12-11 Machine de fabrication et/ou de traitement d'une bande de matière fibreuse

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EP (1) EP2100997A3 (fr)
DE (1) DE102008000597A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4561939A (en) * 1984-03-26 1985-12-31 Beloit Corporation Extended nip press arrangement
DE19705360A1 (de) * 1997-02-12 1998-08-13 Voith Sulzer Papiermasch Gmbh Preßvorrichtung zum Entwässern oder Glätten einer Faserstoffbahn
US7115188B2 (en) * 2002-01-18 2006-10-03 Voith Paper Patent Gmbh Process and apparatus for monitoring dewatering in a wet section of a paper machine

Also Published As

Publication number Publication date
DE102008000597A1 (de) 2009-09-17
EP2100997A3 (fr) 2012-04-04

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