EP1069236A2 - Régulation de la pression dans une caisse de tête - Google Patents

Régulation de la pression dans une caisse de tête Download PDF

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Publication number
EP1069236A2
EP1069236A2 EP00110345A EP00110345A EP1069236A2 EP 1069236 A2 EP1069236 A2 EP 1069236A2 EP 00110345 A EP00110345 A EP 00110345A EP 00110345 A EP00110345 A EP 00110345A EP 1069236 A2 EP1069236 A2 EP 1069236A2
Authority
EP
European Patent Office
Prior art keywords
headbox
pressure
distribution device
sensor
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Withdrawn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
EP00110345A
Other languages
German (de)
English (en)
Other versions
EP1069236A3 (fr
Inventor
Erwin Binder
Hans-Jörg Burbach
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 Paper 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 Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1069236A2 publication Critical patent/EP1069236A2/fr
Publication of EP1069236A3 publication Critical patent/EP1069236A3/fr
Withdrawn legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/024—Details of the feed chamber
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/06—Regulating pulp flow

Definitions

  • the invention relates to a control device for control, preferably for fine control, of pressure in a headbox with a headbox nozzle a paper or board machine hydraulically connected space, with at least a feed line for a fiber suspension, at least one distribution device for the fiber suspension and at least one derivative for the Excess fiber suspension from the distribution device (recirculation line). Furthermore, the invention relates to a control device according to the invention feasible procedure.
  • An essential quality factor of a paper or board web is that Uniformity of the properties, such as the weight per unit area or the formation, the manufactured track.
  • Uniformity of the properties such as the weight per unit area or the formation, the manufactured track.
  • CD machine width
  • MD longitudinal direction
  • a major disruptive factor that is mainly in the longitudinal direction affects, is the temporal variation in the amount of ejected through the headbox Fibrous suspension, which in turn directly with the course of time the pressure in the headbox nozzle and the pulp suspension feed system related.
  • the pressure is made up of a dynamic and a static portion, which form the total pressure in the headbox nozzle.
  • the task is characterized by the features of the device claim 1 and Features of the method claim 14 solved.
  • the inventors have recognized that it is possible to adjust the time fluctuations of the Throughput of fiber suspension through a headbox very sensitive to influence that a control loop between the measured pressure in a room connected to the headbox nozzle, for example in the headbox itself, in particular in the headbox nozzle, or in a feed line of the fiber suspension in the headbox or in front of a throttle device further derivation from the distribution device.
  • a control loop between the measured pressure in a room connected to the headbox nozzle, for example in the headbox itself, in particular in the headbox nozzle, or in a feed line of the fiber suspension in the headbox or in front of a throttle device further derivation from the distribution device.
  • This considered pressure more precisely the pressure fluctuations, both the Total pressure, consisting of the dynamic and static pressure, or the static pressure alone or the static pressure together with one after Bernoulli calculated dynamic pressure can be used.
  • the temporal Pressure fluctuations are in the total pressure as well as in the dynamic and recognizable in the static pressure component, measurable and usable for regulation.
  • the headbox nozzle On the preferred location for pressure measurement is naturally the headbox nozzle itself, however, measurements can be taken in the overall fiber suspension supply of the headbox or other hydraulically coupled to the headbox nozzle Rooms can be used.
  • the space in which the pressure is kept constant is preferably the headbox nozzle itself.
  • due to the hydraulic connection also has another space in the area of the headbox, such as the distribution device or the feed of the fiber suspension after a conveyor unit or further derivation from the distribution device be used in front of a throttle device.
  • the inventors propose a control device for control, preferably for fine control, the pressure in one with a headbox nozzle a headbox of a paper or board machine hydraulically connected Space, with at least one supply line for a fiber suspension, at least a distribution device for the fiber suspension and at least one discharge line for the excess fiber suspension from the distribution device (Recirculation line) to further develop that at least one sensor to measure the pressure in the hydraulically connected to the headbox nozzle Space is provided and at least one in the supply line a speed-controlled and acted upon by the at least one sensor Pump (headbox pump) is located by changing its speed controls the pressure over time in the headbox nozzle.
  • This gives the advantage that by means of an inexpensive unit in the form of a speed-controlled Pump the flow rate in the supply line to the headbox nozzle and thus the pressure prevailing in the headbox nozzle and its time Course can be regulated with constant cross sections.
  • the headbox nozzle is particularly suitable as a measuring point for the pressure measurement sensor. however also the supply line, the discharge line (recirculation line) or the Distribution device.
  • a particularly advantageous embodiment of the invention results when in the at least one distribution device and / or at least one feed line at least one further derivative with at least one of the at least one a sensor acted throttle device is located by opening and Closing regulates the time course of the pressure in the headbox nozzle.
  • This further derivation with adjustable throttle device in the form of a subordinate Control loop has the advantage that it can be attached to the inlet into the Distribution device the excess fiber suspension very quickly and effectively dissipates from the distribution device, and this with low investment and operating costs.
  • At least one further sensor is used Measurement of the pressure provided in the at least one distribution device, wherein in the at least one distribution device and / or at least one Supply at least one further derivation with at least one of the at least another sensor acted throttle device is located by opening and closing the pressure over time in the headbox nozzle regulates.
  • the inventors propose a control device that a time filter is provided in the control circuit which is exclusively disturbances with a time constant t of greater equal to half a second, preferably greater than or equal to one second, for Fine control allows.
  • the time interval between two is used as the time constant t consecutive disorders viewed both periodically and stochastically can be done.
  • a very sensitive throttle device for example, is advantageous a special throttle valve known per se, in particular a control valve, which is very sensitive to the flow rate in a certain range regulates, but does not allow complete curtailment.
  • a control valve which is very sensitive to the flow rate in a certain range regulates, but does not allow complete curtailment.
  • DE 43 05 688 A1 PA04956 DE
  • DE 44 02 515 A1 PA10048 DE
  • the known one Distribution device to be a cross or central distributor.
  • the invention Control device a well-known single or multi-layer headbox be assigned.
  • This fine control according to the invention ensures that - due to the tests now carried out - instead of the currently usual, no longer settable Pressure fluctuations in the range of 3% to 4%, at best 2%, now maximum pressure fluctuations in the range of ⁇ 1%, often ⁇ 0.5%, and partially even only ⁇ 0.3% can be realized.
  • the inventors continue to propose a method to control, preferably fine control, the pressure in one with a Headbox nozzle of a headbox of a paper or board machine hydraulic connected space, with at least one feed line for a fiber suspension, at least one distribution device for the fiber suspension and at least one derivation for the excess fiber suspension from the Distribution device (recirculation line), which the following process steps comprises: measuring the pressure in at least one with the headbox nozzle hydraulically connected space, preferably in the headbox nozzle and Regulation of the speed of the at least one in the feed line for the fiber suspension attached pump (headbox pump) depending on the measured Print.
  • the pressure to be regulated lies, for example, in the supply line, the distribution device, the recirculation line or preferably in the headbox nozzle.
  • the headbox nozzle is particularly suitable for the pressure measurement sensor, however also the supply line, the discharge line (recirculation line) or the distribution device.
  • a particularly advantageous method of the invention results if the temporal Course of the pressure in the headbox nozzle also by opening and closing at least one in at least one further, in the at least one distribution device and / or attached at least one feed line integrated lead Throttle device, which is acted upon by the at least one sensor is regulated.
  • This procedure using another derivative with adjustable throttle device in the form of a subordinate control loop the advantage that they are very close to the inlet in the distributor the excess fiber suspension from the distribution device quickly and effectively dissipates.
  • Another method according to the invention provides that the time course the pressure in the headbox nozzle also by opening and closing at least one in at least one other, in the at least one distribution device and / or attached at least one feed line integrated lead Throttle device by at least one other, in the at least one Distributor attached sensor is acted upon, is regulated.
  • the control engineering advantage results in the shortest possible dead time thanks to a subordinate control loop with its own sensor at low costs.
  • Fine control only faults with a time constant t greater than or equal half a second, preferably one second.
  • the distribution device used can be in the feed line for the fiber suspension be both a cross and a central distributor, as in the modern paper or board machines that work according to the dilution principle, for controlling the basis weight and fiber orientation cross profile is used.
  • the distribution device can be used both for the fiber suspension and equipped for the white water with the control according to the invention become.
  • time filter specified above is in itself known way electronically or by appropriate computer programs can be realized.
  • FIG. 1 shows a control device according to the invention using the example of a Headbox 1, consisting of a distribution device 2 in the form of a cross distributor 3, a turbulence generator 4 and a headbox nozzle 5 that machine-width the pulp suspension 100 on sieve, not shown, or distributed between two sieves, not shown. Further there is at least one derivative 6 at the end of the distribution device 2 (Recirculation line) through which the in the distribution device 2 possibly excess fiber suspension 100 removed becomes; the derivation 6 can also consist of several small derivation channels, the flow cross-sections and thus the flow rates individually, in Groups or in their entirety controlled or regulated, for example by a manually operated manual valve or, as shown in Figure 1, by a controlled Control valve, can be.
  • a distribution device 2 in the form of a cross distributor 3, a turbulence generator 4 and a headbox nozzle 5 that machine-width the pulp suspension 100 on sieve, not shown, or distributed between two sieves, not shown.
  • the derivation 6 can also
  • the fiber suspension 100 which is shown as arrow 7 is shown, passes through a feed line 8, in which a speed-controlled pump 9th (Headbox pump) is arranged in the cross distributor 3 and becomes mostly via the turbulence generator 4 to the headbox nozzle 5, in the it creates a pressure.
  • the pressure especially a temporal change in the Pressure is measured by a sensor 10 and as a measured variable to the two control units 11 and 12 (PIC and SIC) connected in series are forwarded, which according to the laws of a control loop known per se make a possible correction to the speed of the speed-controlled pump 9 and thus the flow rate of fiber suspension and the prevailing Determine temporal pressures in the headbox with unchanged cross sections.
  • FIG. 1a shows a control according to Figure 1, but is additional in addition to the speed-controlled pump 9 in the designed as a cross distributor 3 Distributor 2 attached a further derivative 13, the flow rate is regulated by means of a throttle device 14.
  • the throttle device 14 receives their control variables directly from the two control units connected in series 11 and 12 (PIC and SIC), which, as already mentioned above, their measured variables again from the sensor 10 which is in the headbox nozzle 5 of the headbox 1 is attached, receives, In this embodiment, the rough control of the Pressure in the headbox nozzle 5 by the speed-controlled pump 9, while the fine control exclusively via the throttle device 14 is realized in the further derivation 13.
  • PIC and SIC two control units connected in series 11 and 12
  • Control device for the flow of excess Fibrous suspension 100 is in this figure as a manually operated manual valve executed; the leads 6 can also be designed as described in FIG. 1 his.
  • the fiber suspension 100 which is shown as arrow 7 is represented by a feed line 8, in which a speed-controlled pump 9 (Headbox pump) is arranged, enters the cross-distributor 3.
  • FIG. 1b shows a control according to Figure 1, but is additional in addition to the speed-controlled pump 9 in the designed as a cross distributor 3 Distributor 2 attached a further derivative 13, the flow rate is regulated by means of a throttle device 14.
  • the throttle device 14 receives their controlled variables directly from one of the control unit 15 (PIC), which their measured variables from a sensor 16, which is attached in the distribution device 2 of the headbox 1 is received.
  • PIC control unit 15
  • sensor 16 which is attached in the distribution device 2 of the headbox 1
  • the rough regulation of Pressure in the headbox 5 by the speed-controlled already described above Pump 9 together with control circuit components (attached to the headbox nozzle 5 Sensor 10, control units 11 and 12) made during the Fine control exclusively via the throttle device 14 in the further derivation 13 is realized.
  • fluctuations in larger intervals of e.g. Viewed 1.5 seconds while fine tuning the fluctuations occurring at short intervals ( ⁇ 1.5 s) are accepted.
  • FIG. 2 shows a pressure control according to the invention on a dilution water-regulated headbox 1 with a distribution device 2.1 for the fibrous suspension 100 and a distribution device 2.2 for the white water 101 as a dilution strand.
  • fiber suspension 100 which is shown as arrow 7.1
  • the speed-controlled pump 9.1 headbox pump
  • the white water 101 which is shown as arrow 7.2
  • the speed-controlled pump 9.2 of the distribution device 2.2 is supplied.
  • the flow rate of white water 101 is measured in the feed line 8.2 by means of a flow meter 20 and passed on as a measured variable to the two control units 12.2 and 12.3 (FIC and SIC) connected in series, which, as already described for the fiber suspension 100, according to the laws of one make a possible correction to the speed of the speed-controlled pump 9.2 in a known control circuit and thus determine the delivery rate of white water 101.
  • FIG. 2 it can also be seen that at least one further discharge line 13.1 and 13.2 are attached to the distribution devices 2.1 and 2.2 designed as cross distributors 3, the flow rates of which can be regulated by means of a respective throttle device 14.1 and 14.2.
  • the throttle devices 14.1 and 14.2 receive their controlled variables directly from the respective control units 15.1 and 15.2 (PIC), which receive their measured variables from their associated sensors 16.1 and 16.2, which in turn are attached in their distributing devices 2.1 and 2.2 of the headbox 1.
  • PIC control units 15.1 and 15.2
  • the rough control of the pressure in the headbox nozzle 5 is carried out by the above-described speed-controlled pump 9.1 together with control circuit components (sensor 10, control units 11 and 12.1 attached to the headbox nozzle 5), while the fine controls are carried out exclusively via the throttle devices 14.1 and 14.2 in the further derivatives 13.1 and 13.2 are realized.
  • FIG. 3 shows a further, modern variant of a fiber suspension supply system for a headbox 1 with a central distributor 19 and the control according to the invention similar to Figure 1b.
  • the supplied pulp suspension 100 which is shown as arrow 7, through a feed line 8 to a central distributor 19 and from there via a large number of feeds 17.1 to 17.5, which are not shown here
  • Cross section control are regulated, headed into the headbox 1.
  • 17.1 to 17.5 are regulated white water supplies 18.1 to for each feed 18.5 shown, which are also connected to the cross profile control and in a manner known per se, the cross profile of the paper or Set the cardboard web.
  • the coarse control is speed-controlled in the supply line 8 Pump 9 together with control circuit components (attached to the headbox nozzle 5 Sensor 10, control units 11 and 12) made during the fine control based on that measured in the central distributor 19 by means of a sensor 16 Pressure exclusively on the attached in the further derivation 13 and throttle device 14 controlled by the control unit 15 is realized.
  • a valve is attached that in a known manner as a manual valve (manual actuation) or as a control valve (actuation by means of a control circuit) can be executed.
  • a control device and an overall Process for regulating the pressure in the headbox nozzle of a headbox a paper or board machine which allow a very fine correction of the pressure in the headbox nozzle and thus the throughput to make fiber suspension through a headbox.

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  • Paper (AREA)
EP00110345A 1999-07-14 2000-05-15 Régulation de la pression dans une caisse de tête Withdrawn EP1069236A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19932745 1999-07-14
DE1999132745 DE19932745A1 (de) 1999-07-14 1999-07-14 Regelung des Druckes in einer Stoffauflaufdüse

Publications (2)

Publication Number Publication Date
EP1069236A2 true EP1069236A2 (fr) 2001-01-17
EP1069236A3 EP1069236A3 (fr) 2003-07-09

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ID=7914638

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00110345A Withdrawn EP1069236A3 (fr) 1999-07-14 2000-05-15 Régulation de la pression dans une caisse de tête

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EP (1) EP1069236A3 (fr)
DE (1) DE19932745A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1987329A4 (fr) * 2006-02-01 2010-03-10 Astenjohnson Inc Caisse de tete et systeme d'alimentation en pate de machine a papier

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2598852A (en) * 1946-07-24 1952-06-03 Black Clawson Co Feed regulator for paper machinery
US4086130A (en) * 1976-07-16 1978-04-25 Beloit Corporation Control system and method for a multi-channel paper machine distributor
CH619777A5 (fr) * 1977-10-20 1980-10-15 Escher Wyss Gmbh
SE422091B (sv) * 1978-03-23 1982-02-15 Karlstad Mekaniska Ab Inloppslada for en pappersmaskin
AT376251B (de) * 1980-12-19 1984-10-25 Escher Wyss Gmbh Einrichtung zur beschickung eines mehrlagen-stoffauflaufes fuer papiermaschinen
SE431663B (sv) * 1982-07-06 1984-02-20 Karlstad Mekaniska Ab Forfarande och anordning for avgivande av en flerskiktsmeldstrale till en formningsyta i en pappersmaskin

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1987329A4 (fr) * 2006-02-01 2010-03-10 Astenjohnson Inc Caisse de tete et systeme d'alimentation en pate de machine a papier

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Publication number Publication date
DE19932745A1 (de) 2001-03-22
EP1069236A3 (fr) 2003-07-09

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