EP0590433B1 - Procédé de commande pour diriger la production de pâte à papier à travers le contrÔle de pression et température - Google Patents

Procédé de commande pour diriger la production de pâte à papier à travers le contrÔle de pression et température Download PDF

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Publication number
EP0590433B1
EP0590433B1 EP93114964A EP93114964A EP0590433B1 EP 0590433 B1 EP0590433 B1 EP 0590433B1 EP 93114964 A EP93114964 A EP 93114964A EP 93114964 A EP93114964 A EP 93114964A EP 0590433 B1 EP0590433 B1 EP 0590433B1
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EP
European Patent Office
Prior art keywords
cooking
pressure
phase
pulp
temperature
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.)
Expired - Lifetime
Application number
EP93114964A
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German (de)
English (en)
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EP0590433A2 (fr
EP0590433A3 (en
Inventor
Herbert Dr. Furumoto
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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Publication of EP0590433A2 publication Critical patent/EP0590433A2/fr
Publication of EP0590433A3 publication Critical patent/EP0590433A3/de
Application granted granted Critical
Publication of EP0590433B1 publication Critical patent/EP0590433B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/22—Other features of pulping processes
    • D21C3/228—Automation of the pulping processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C7/00—Digesters
    • D21C7/12—Devices for regulating or controlling

Definitions

  • the invention relates to a method for control cooking a suspension of wood pulp and cooking liquid in a plant for the production of pulp at which, in a first phase, heats up at a given one Print as impregnation print and in a second Phase the actual cooking at a given temperature and reduced pressure as cooking pressure.
  • the procedure for the production of pulp is in Principle previously known from SU-A-1 325 110 A.
  • the invention In addition to the process, it also relates to the associated one Device for performing the method.
  • the process is carried out for the production of pulp in a batch working stove essentially by taking suitable measures for chemical process control, in particular the tracking of at least one component of the cooking liquid. This makes it possible to comply with the for cooking a batch with a view to sufficient Productivity available time the desired pulp quality with the lowest possible To use chemicals and energy.
  • the object of the invention is specify a procedure by which the controllability of the procedural process of cooking a suspension from wood pulp and cooking liquid to pulp improved is, and thus the optimal described above Cancellation of the cooking with regard to the exact Achievement of predetermined values of yield and if necessary the tensile strength of the finished pulp more precisely can be met.
  • the task is in a method of the aforementioned Art according to the invention through the use of fuzzy logic solved according to the characterizing part of claim 1.
  • the control advantageously takes place with fuzzy input variables, including the actual values of one previous batch can be used. It will generated such output variables for the control with which the process control is improved, whereby the impregnation pressure in the first phase of cooking when heating up the suspension and the cooking pressure in the second phase at Ready cooking of the suspension consistently optimized values receive.
  • An associated device for performing the method has a program-controlled computer, in particular a programmable logic controller, an automation system or a process computer, which a Cooking control program includes with a Fuzzy controller for controlling the pressure and the finished cooking temperature in the plant for pulp production.
  • the suspension of wood pulp and cooking liquid in the first phase T1 during the cooking heating a pressure with the highest possible value exposed.
  • This print is also called “impregnation print” called.
  • the Suspension with finished cooking temperature becomes the value of Pressure lowered. This is also "cooking pressure” called.
  • the diagram in FIG. 2 shows the time course of the yield A and the tensile strength R of the pulp essentially in the second phase of the boil T2 and the subsequent area of the overboil, for example for a smaller value TM1 in a solid line and for a larger value TM2 of the finished cooking temperature TM in dashed line.
  • the "yield” is the mass of the finished pulp produced based on the mass of the wood introduced.
  • the tensile strength R (t) of the pulp for example for the smaller value TM1, has increasing values only starting at time t 0 .
  • the time course of the tensile strength R (t) of the pulp has a maximum at point t2, and decreases with the yield as the cooking time increases.
  • the cooking should theoretically be depending on the respective production target in the abruptly aborted, e.g. in 2 at time t1 when requesting a high Pulp yield or at time t2 when requesting high tensile strength of the finished pulp. Practically can but the plant for pulp production an end time by reducing the high cooking temperature and the internal pressure only gradually reduced will. In this "braking phase”, however, the cooking fluid acts further on the pulp fibers and shifts the based on FIG 2 operating points in principle Direction to the area of "overcooking". So in Period between a stop command for cooking and the final opening of e.g. discontinuously operated Kocher's marked loss of yield Finished cellulose and, if necessary, additional tensile strength of the finished pulp occur.
  • the pressure curve (p (t) is shown in detail in FIG.
  • the impregnation pressure p (T1) in the first phase T1 of cooking a very high value of for example 10 bar.
  • TM (T2) with the value of 130 ° C at the time for example of about 4.5 hours in the example of FIG Value of the pressure on the so-called "cooking pressure" p (T2) lowered from 6 bar as an example.
  • the invention In contrast to the previous constant cooking pressure over the entire period of cooking, i.e. for the sum of the two phases p1 and p2, the invention teaches the default a "pressure profile". This can be particularly advantageous an equalization of the achievable product quality and thus an improvement in the controllability of the process can be achieved. The reason for this is that through the high value of pressure in the first phase of high heating the suspension more reproducible starting conditions for the beginning of the second phase T2 of cooking, i.e. of the so-called main cooking phase can be achieved.
  • the inventive specification of the "pressure profile” comes essentially the improvement of accurate achievement a desired target value for the tensile strength of the Finished pulp benefits. It can therefore be the same Overall yield of finished pulp an increase in tear strength of the finished pulp can be achieved.
  • the pressure in the first phase of cooking can preferably be to the maximum permissible operating pressure of the system can be increased.
  • the Operating pressure is designed so that in the piping system the system and especially with seals in Pipe flanges as the weakest elements of the system no damage occurs. If necessary, the lowered Value of "cooking pressure" in the second phase of cooking in Dependence on a given target value of the tensile strength of the finished pulp.
  • the pressure in the first phase of the Kochuna one above and in the second phase of cooking an underlying value.
  • the "impregnation print” is an example in the first phase T1 of cooking in the area from 9 to 12 bar.
  • the "cooking pressure” in the second phase T2 of cooking in the range of 5 to 7 bar.
  • the pressure reduction from the high value p (T1) in the first phase to the lowered value p (T2) in the second phase should be at least Amount to 2 bar.
  • the "impregnation pressure” a value of 10 bar and the reduced “cooking pressure” a value of 6 bar.
  • Procedures are made when changes in value occur at the concentrations of the chemical reaction substances in the cooking liquid the values of the pressure p (T1), p (T2) in the first and / or second phase of cooking T1, T2 the Suspension with reverse direction of action changed. At Concentration increases or decreases the pressure values are questionable reduced or increased.
  • the concentrations of the chemical reactants high in the cooking liquid are e.g. the concentrations of the chemical reactants high in the cooking liquid, so in the first phase the Boil one below the maximum allowable operating pressure the "impregnation pressure value" lying in the cellulose cooking plant is sufficient be. In this case, the pressure around 20 is preferred up to 30% less than the maximum permissible operating pressure.
  • the time lowering the pressure between the first and the second phase of cooking brought forward or postponed if the tensile strength R of the finished pulp at the end of the Cooking should assume a higher or lower value.
  • the time of switching between the two Pressure levels, i.e. the point of pressure reduction, brought forward will. This may be due to the current situation Production constraints may sometimes be necessary, though this measure is at the expense of the achievable yield. Because of the less intensive impregnation in the first Phase T1 can therefore only produce less pulp, which has the desired high level of tear resistance.
  • the pressure at the moment of reaching the is preferred desired value of the finished cooking temperature lowered. If necessary, the pressure drop can also be waited for be until the process of home cooking at the beginning of the second phase has started. In this case the pressure drop preferably 30% after the end of the period between the expected reaching of the finished cooking temperature and the end of cooking.
  • the final cooking temperature T (T2) is in the process second phase T2 of cooking is limited if due to existing process conditions the expected yield Finished cellulose with a desired level of tear strength decreases.
  • the measure of limiting the cooking pressure according to the invention in the second phase of cooking "Controllability" of the process with the aim of maintaining it with a desired high yield of pulp a predetermined value of tensile strength further improved. Due to the reduced cooking pressure in the second phase the chemical reactants in the cooking liquid act anyway only slowed down on the pulp fibers. Becomes in addition, especially when there is a risk of "overcooking" the pulp by boiling also the final cooking temperature limited, so it's easier to get one Finished pulp e.g. with a defined residual lignin concentration or tensile strength.
  • the cooking temperature can preferably be limited to two different types are made. For example, for the whole second phase T2 of cooking the maximum allowable value Tmax of the finished cooking temperature T (T2) must be reduced. This is particularly advantageous if the value of the "cooking pressure" at the beginning of the second phase due to the existing process boundary conditions at the upper limit of the permissible value range lies. Limiting the maximum allowable Value of the cooking temperature favors "controllability" of the system and thus reduces the risk of misconduct the desired yield and if necessary tear strength in the finished pulp at the end of cooking.
  • the limitation of the finished cooking temperature also by lowering the setpoint for the finished cooking temperature in the second phase T2.
  • the setpoint is preferred towards the end of cooking or lowered in the last third of the second phase T2. This is shown in the example of FIG 1. It takes place in about Time 7.7 hours one entered in dashed line Reduction of the cooking temperature from approx. 130 ° C to approx. 120 ° C. in pulp production after the "sulfite process" the temperature drop preferably has a value of 5 to 10 ° C.
  • the measures of pressure reduction according to the invention at the beginning the second cooking phase and a possible additional one Increase the temperature limit in the second cooking phase by Harmonization of the process flow, its controllability. It is therefore by more precise specification of an abort time possible with greater accuracy, a desired one Value of finished pulp with tensile strength to produce with the greatest possible yield.
  • a particularly advantageous device for performing the The inventive method has a program-controlled Computer, in particular a so-called programmable logic controller Controller, an automation system or one Process computer.
  • the optimal values of the "Impregnation pressure" p (T1), the “cooking pressure” p (T2), the Switching point between the two pressure values, the optimal one Ready cooking temperature TM (T2), its possible limitation or lowering towards the end of cooking and in With regard to achieving a pulp with the desired Tear strength determines the optimal termination point of the boil.
  • fuzzy controllers are preferred as input variables Target values for the tensile strength and yield of the Finished pulp, and actual values for the current wood quality and the concentrations of the chemical reactants given in the cooking liquid.
  • the fuzzy controller can be used as input variables additionally the pulp at the end of the previous batch actual values of tensile strength and yield are supplied as input variables.
  • FIG. 3 there is an exemplary set of Input variables preferred for a fuzzy controller for guidance a system operated batchwise in batch mode shown.
  • the supplement (s) characterize Actual values, which at the start of processing the current Batch were recorded. This applies in particular to the quality of the wood Q and the concentrations 1.2 of two by way of example chemical reactants in the cooking liquid. Possibly can also have a change value ⁇ Q of Wood quality can also be supplied as an input variable.
  • the addition (n-1) indicates that it is at this actual value by a result value of the cooking one previous batch. This applies in particular the tensile strength R, the achievable yield B and the Committee A. occurring in these cases too additionally change values ⁇ R, ⁇ B, ⁇ A additionally as input variables be fed.
  • the output variable is the Fuzzy controller at least manipulated variables for the "impregnation pressure" p (T1) in the first phase of cooking, for the “cooking pressure” p (T2) in the second phase of cooking and preferred for the maximum permitted final cooking temperature TM (T2).
  • the Program for controlling the cooking in the device for Carrying out the method additionally a "neural network" NZ to manage the pressure and, if necessary, the finished; cooking temperature in the plant for pulp production.
  • NZ a "neural network” NZ to manage the pressure and, if necessary, the finished; cooking temperature in the plant for pulp production.
  • the system is managed by the fuzzy controller.
  • the neural network is indeed with the same input variables supplied, but runs for the duration of it Adaptation without connection to the system in parallel with. First takes over after the adaptation of the neural network instead of the fuzzy controller, the management of the system.
  • a neural network NZ, the set of input variables already described above is fed.
  • the rough structure of the neural network is the structure of the fuzzy controller is adequate. This manifests itself at least in a matching set of inputs and Output variables.
  • a neural network has one Large number of so-called “neurons” grouped together on.
  • each input variable is one Neuron from the set assigned to the input neurode EN.
  • each Neuron to deliver an output variable.
  • two further sets of neurons available which are referred to as "hidden layers" HL1, HL2 will.
  • the network's neurons are over a variety of Connections interconnected, which with so-called “Weights” are rated.
  • the “adaptation” of the network is the structure of these connections and the Values of the "weights" per connection as part of a regression calculation depending on the current values of the respective input variables. Only after graduation this adaptation, the neural network can set the Map input variables in the set of output variables.
  • the neural network has to do this at least once Commissioning of the plant for pulp production for Go through the adaption a certain time with current Input variables are supplied. It runs parallel to Fuzzy controller in so-called "off-line” operation. Only after Completion of the adaptation, i.e. after determining the "weights" for each new neuron connection, the neural network can Replacing the fuzzy controller and the process control of the Take over plant for pulp production.
  • the adaptation of the neural network constantly in operation and it will do this at least the actual values of the tensile strength and yield of the Finished pulp is constantly returned as input variables.
  • a neural network is particularly well suited for execution of the method according to the invention.

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Claims (8)

  1. Procédé pour se rendre maítre de la cuisson d'une suspension de pâte de bois et de liqueur de cuisson dans une installation de fabrication de pâte à papier, dans lequel dans une première phase on effectue un chauffage sous une pression prescrite en tant que pression d'imprégnation et dans une seconde phase on effectue la cuisson proprement dite à une température prescrite et à une pression abaissée en tant que pression de cuisson, caractérisé par l'utilisation de la logique floue pour mener les opérations, en utilisant comme entrées pour la logique floue au moins les valeurs de consigne pour la qualité et le rendement de la pâte à papier finie ainsi que les valeurs réelles de la pâte en traitement utilisée, et on obtient comme sorties des valeurs réglantes au moins pour la pression d'imprégnation dans la première phase de la cuisson ainsi que de la pression de cuisson dans la seconde phase de la cuisson, de sorte que
    a) on peut soumettre dans la première phase (T1) de la cuisson la suspension à la pression d'imprégnation ayant une valeur (p(T1)) aussi haute que possible, et
    b) on peut amener pour la seconde phase (T2) de la cuisson de la suspension, sous une pression de cuisson (p(T2)) abaissée, la température de cuisson finale (TM(T2)) à une valeur appropriée (Tmin ≤ (TM (T2) ≤ (Tmax),
    c) on peut prévoir l'instant d'interruption avec une grande précision.
  2. Procédé suivant la revendication 1, caractérisé en ce que. s'il survient des modifications de valeur des concentrations des substances chimiques de réaction dans la liqueur de cuisson, les valeurs de la pression (p(T1)) et (p(T2)) dans la première et/ou dans la seconde phase de la cuisson (T1) ou (T2) de la suspension sont modifiées en sens inverse des variations des valeurs.
  3. Procédé suivant l'une des revendications précédentes. caractérisé en ce que l'instant de l'abaissement de la pression entre la première et la seconde phase (T1, T2) de la cuisson est avancé ou retardé si la résistance (R) à la rupture de la pâte à papier finie doit prendre à la fin de la cuisson une valeur plus grande ou plus petite.
  4. Procédé suivant l'une des revendications précédentes, caractérisé en ce que la température (T(T2)) de cuisson finale dans la seconde phase (T2) de la cuisson est limitée si, en raison des conditions opératoires qui règnent. le rendement en pâte à papier finie auquel on peut s'attendre. ayant une valeur souhaitée de résistance (R) à la rupture. diminue à la fin de la cuisson.
  5. Procédé suivant la revendication 4, caractérisé en ce que l'on abaisse pour la seconde phase (T2) de la cuisson la température de la cuisson terminée (p(T2)) par rapport à sa valeur (Tmax) maximum admissible.
  6. Procédé suivant la revendication 4 ou 5. caractérisé en ce que la valeur de consigne pour la température (T(T2) de cuisson finie est abaissée en tant que grandeur d'entrée pour la régulation en logique floue.
  7. Installation pour la mise en oeuvre du procédé suivant la revendication 1 ou l'une des revendications 2 à 6. comprenant un ordinateur commandé par programme, notamment un automate programmable, un système d'automatisation ou un ordinateur de processus. qui comporte un programme pour se rendre maítre de la cuisson avec un régulateur en logique floue pour commander la pression (p(T1), p(T2)) et la température de cuisson finie (TM(T2)) dans l'installation de fabrication de la pâte à papier.
  8. Installation suivant la revendication 7, caractérisée en ce que
    a) le programme pour se rendre maítre de la cuisson comporte en plus un réseau (NZ) neuronal pour commander la pression et/ou la température de cuisson finie dans l'installation de fabrication de la pâte à papier. et
    b) après la mise en fonctionnement, l'installation est guidée par le régulateur en logique floue et le réseau neuronal est alimenté par les mêmes grandeurs d'entrée. le réseau fonctionnant en parallèle pendant la durée de l'adaptation sans liaison avec l'installation de fabrication de pâte à papier et. après la fin de l'adaptation, prenant en charge le guidage de l'installation de fabrication de pâte à papier à la place du dispositif de régulation en logique floue.
EP93114964A 1992-10-02 1993-09-16 Procédé de commande pour diriger la production de pâte à papier à travers le contrÔle de pression et température Expired - Lifetime EP0590433B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4233264 1992-10-02
DE4233264 1992-10-02

Publications (3)

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EP0590433A2 EP0590433A2 (fr) 1994-04-06
EP0590433A3 EP0590433A3 (en) 1996-09-25
EP0590433B1 true EP0590433B1 (fr) 1999-08-25

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EP93114964A Expired - Lifetime EP0590433B1 (fr) 1992-10-02 1993-09-16 Procédé de commande pour diriger la production de pâte à papier à travers le contrÔle de pression et température

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EP (1) EP0590433B1 (fr)
AT (1) ATE183786T1 (fr)
DE (1) DE59309744D1 (fr)
FI (1) FI934316A7 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4443193A1 (de) * 1994-12-05 1996-06-13 Siemens Ag Verfahren zum Betrieb neuronaler Netze in Industrieanlagen
DE19510008C2 (de) 1995-03-23 1997-01-30 Siemens Ag Verfahren und Vorrichtung zur Prozeßführung bei der Zellstoff- und/oder Papierherstellung
EP0854953B1 (fr) * 1995-10-09 2000-02-09 Siemens Aktiengesellschaft Procede pour determiner la fin de cuisson de la cellulose et dispositif pour commander le temps de cuisson lors de la cuisson dans un reacteur
DE19752442C2 (de) * 1997-11-26 2000-05-25 Siemens Ag Steuereinrichtung für einen kontinuierlich arbeitenden Kocher zur Herstellung von Zellstoff
WO1999028548A1 (fr) * 1997-11-26 1999-06-10 Siemens Aktiengesellschaft Dispositif de commande pour lessiveur fonctionnant en continu pour la production de cellulose

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1325110A1 (ru) * 1985-12-23 1987-07-23 Марийский филиал Всесоюзного научно-исследовательского института бумаги Способ получени целлюлозы
JPH07109074B2 (ja) * 1989-10-31 1995-11-22 横河電機株式会社 抄紙機制御装置及びその制御方法
DE9017325U1 (de) * 1990-12-21 1992-01-02 Siemens AG, 8000 München Prozeßleitsystem zur Steuerung der Herstellung von Zellstoff

Also Published As

Publication number Publication date
FI934316A7 (fi) 1994-04-03
EP0590433A2 (fr) 1994-04-06
DE59309744D1 (de) 1999-09-30
ATE183786T1 (de) 1999-09-15
FI934316A0 (fi) 1993-10-01
EP0590433A3 (en) 1996-09-25

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