FI115081B - Method and apparatus for controlling the operation of a pulp department of a paper machine - Google Patents

Description

115081

Method and apparatus for controlling the operation of a pulp department of a paper machine

The invention relates to a method for controlling the operation of a pulp compartment 5 of a papermaking machine adapted to produce a pulp of a pulp which is fed to a papermaking machine by mixing one or more submassages, each comprising a plurality of successive mixing points / or mas-10 is diluted by mixing dilution water with pulp, and which method controls the flow and / or consistency of one or more pulps entering the mixing point and / or the concentration of the second feedstock in the pulp and / or adjusting the flow and consistency and / or pulp leaving the mixing point. the concentration of the second raw material in the pulp.

The invention further relates to an apparatus for controlling the operation of a pulp section of a papermaking machine adapted to produce a pulp fed to a papermaking machine by mixing one or more submassages together and each pulp section comprising a plurality of successive mixing points where adding to the pulp another raw material of the pulp and / or diluting the pulp by mixing the dilution water, which apparatus is adapted to adjust the flow and / or consistency of one or more pulps entering the mixing point and / or the concentration of the second raw material or to control the flow and consistency of mass i · * 25 from the mixing point and / or the concentration of the second raw material in the pulp.

The invention also relates to a method for controlling the operation of a pulp section of a papermaking machine adapted to produce a pulp fed to a papermaking machine by mixing one part or more of the pulp and mixing the pulp into the pulp section. the second raw material and / or pulp is diluted by mixing the dilution water with the pulp, and wherein the method adjusts the flow and consistency of the pulp going forward in the pulp dosing line and / or the concentration of the second pulp * 35 in the pulp.

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The measured basis weight of the papermaking paper web or derived quantities, such as air dry or completely dry basis weight of the paper web, is controlled by controlling the dose of pulp or pulp from the pulp compartment to a short cycle of the papermaking machine. The pulp that is fed into a short cycle of a paper machine is typically called machine pulp. Since the pulp cannot be manufactured in such a uniform quality and quantity that the pulp could be led directly from the manufacturing equipment to the paper machine, the pulp compartment comprises a large variety of storage or intermediate containers. The different partial pulps entering the machine pulp, i.e. pulps containing different types of fibers, form the first raw material of the pulp, i.e. the fibrous raw material of the pulp. The various fillers, additives, or chemicals added to the pulp or partial pulps form another raw material for the pulp. These various fillers, additives, and chemicals are used to improve the quality properties, printability, or process performance of the finished paper. Particles, fillers, additives, and chemicals are typically stored in large storage containers. The composition of the pulp going to the papermaking machine is controlled by a pulp dosing system where the various pulp components entering the pulp are mixed with each other both in the mixing tank tube and the mixing tank itself, from which the pulp is led to the machine tank. Typically, the consistency of short-circuiting pulp is maintained at 3%. Since the consistency of the pulps to be stored in storage tanks is usually 10-14% and the pulp pulp is usually about 5%, I 'is diluted to a consistency of ≤ 25 different pulps and, if appropriate, mixed pulp by adding water, typically stripped water. The consistency of the pulp fed to the papermaking machine is thus adjusted by changing the amount of dilution water to be fed to the pulp, i.e.: · *: Adjusting the pulp consistency is always about adding dilution water to the pulp in an appropriate proportion to the pulp volume and consistency.

• · · 30 The basis weight of the paper web being manufactured is adjusted by changing the fiber flow to the paper machine. In practice, adjusting the basis weight-> · ·. this is done by changing the flow of the pulp. Since the basis weight control cannot know the incoming pulp consistency variations, the consistency variation can be eliminated, for example, by adding an additional specification of "3% consistency" to the mass flow request of the machine pulp, i.e., 3% consistency of the pulp consistency. target 3 115081

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5 teas, adjust the flow target accordingly. The desired fiber flow is thus supplied to the paper machine. The basis weight control requests the amount of fiber stream or machine stock flow required from the pulp department machine reservoir, which aims to maintain a constant amount of pulp at all times. The change in the basis weight results in a change in the flow of the pulp, i.e. a flow disturbance, from the paper machine towards the bulk storage tanks, which is further exacerbated by the adjustment of the level of each intermediate container in the dispensing line. Due to the strong and rapid flow disturbances, the consistency adjustments are not kept, but the consistency disturbances occur, which propagate with the mass flow of the chicken towards the paper machine. Due to the large volume of the intermediate containers and the considerable length of the dispensing line, the process has long delays, which makes pulp control very sensitive both to particle consistency variations and filler, additive, and chemical concentrations which in turn easily result in retention variations. Variation in retention on the wire section also causes changes in the ash content and basis weight of the paper web. The flow disturbance caused by the change in basis weight thus first proceeds as a flow disturbance from the machine container through the dispensing tanks towards the mass towers and returns as a consistency disturbance through the dilution steps of the dispensing line to its pulp and further up to the basis weight of paper. The weight of the square-20 is measured at the dry end of the papermaking machine just prior to the web being rolled into a machine roll, whereby the basis weight error detected from the measurement causes a new change, i.e. flow disturbance, by changing the machine pulp flow. As a result, vibration is difficult to control, resulting in paper or board containing the wrong "basis weight and ash content. This vibration also causes other disturbances in the operation of the process, for example through dilution lines.

»> · ',' ·· The dosing solution based on the mixing capacity of the machine tank and the mixing tank above is not the only viable solution. Dosing and mixing of the partial masses can also be solved in other ways. The machine tank and the mixing tank 30 may be, for example, two successive mixing tanks and:. machine tank as the third tank, whereby mixing is believed to be even better controlled. If the consistency and other properties of the partial masses are well controlled, one container can be satisfied. The new solutions aim to mix the partial masses in a separate mixing device in a short cycle, whereby no mixing tank and machine tank are in the process.

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Nowadays, the pulp compartment dosing is controlled by adjusting the surface heights of various pulp tanks, as well as the consistency and flow rates of the pulp streams at various points in the process by feed-in unit control, such as for controlling the basis weight of paper or paperboard by means of fractional metering, each of which utilizes feedbacks to control the process. However, the use of feed-back in control is problematic because when using feed-in, it is not possible to take into account the effects of control changes in the post-process part of the process.

The object of the present invention is to provide a novel type of solution for controlling the operation of a mass department.

The process according to the invention is characterized in that the consistency of one or more pulps entering the mixing point or the concentration of the second raw material in the pulp is determined and the consistency of the pulp leaving the mixing point or the concentration of the second raw material in the pulp an exiting mass flow rate, determining a consistency prediction of the consistency of one or more pulps entering the mixing point or a prediction of the concentration of the second raw material in the pulp, determining a flow rate exiting the mixing point, determining one or more incoming points; pulp consistency target or target pulp target material concentration: 25 and / or determine the consistency of target pulp from the mixing point or target pulp at one or more of the following:: ··: man mass flow rate target and / or mixing point mass flow target ** and adjusting the flow and / or consistency of the one or more pulps entering the mixing point and / or the concentration of the second raw material in the pulp from the mixing point !! the predicted flow rate and / or one or more of the following at the mixing point: * * the predicted consistency of the pulp and / or the concentration of the second raw material in the pulp, with the flow of one or more of the mass entering the mixing point / or the consistency follows the determined consistency target and / or the concentration of the second feedstock 5 115081 in the pulp follows the determined target concentration and / or adjusts the flow from the mixing point and the consistency and / or the concentration of the second raw material in the pulp from the mixing point on the basis of the predicted flow rate and / or the predicted consistency of one or more pulps entering the mixing point and / or the second feedstock concentration of the pulp, with the flow leaving the mixing point following the determined flow target and the consistency following the determined consistency target and / or the concentration of the second raw material in the pulp follows the determined target concentration.

Further, the apparatus according to the invention is characterized in that the apparatus is adapted to determine the consistency of one or more pulps entering the mixing point or the concentration of the second raw material in the pulp and to determine the consistency of the pulp leaving the mixing point. determining the consistency consistency of one or more pulps coming from the mixing point and determining the consistency of one or more pulps entering the mixing point the target concentration of the second feedstock in the pulp and / or to determine the consistency target of the pulp leaving the mixing point or the target mass concentration of the feedstock to determine the flow target for one or more mass flows to the mixing point • * '25 and / or the mass flow target from the mixing point and to control the flow of one or more masses to the mixing point and / or »· Y - consistency and / or concentration of the second feedstock in the pulp *: * ·: based on the predicted pulp flow from the mixing point and / or the predicted consistency of the one or more pulps entering the mixing point and / or the second raw material in the pulp, that the flow of one or more pulps to the mixing point follows '··, the determined flow target and / or the consistency follows the determined consistency target »l' and / or the concentration of the second feedstock mass in the pulp follows the determined target concentration and / or san flow j a the consistency and / or the concentration of the second raw material in the pulp, based on the predicted mass flow from the mixing point and / or the predicted consistency of one or more pulps entering the mixing point and / or the second raw material in the pulp, the pulp flow follows the determined flow target and the consistency follows the determined consistency target and / or the concentration of the second machine machine-5 sanitary pulp follows the determined target concentration.

Further, the method according to the invention, wherein the flow and consistency of the pulp leaving the mixing point and / or the concentration of the second raw material in the pulp is characterized by determining the pulp flow information and flow prediction, determining the flow information and flow prediction of one or background information and flow forecast backward along the pulp dosing line so that the flow controls for the dosing line utilize predicted future flow changes; and the consistency forecast and / or the concentration of the second raw material in the pulp and the concentration in the pulp dosing line forward, so that the controls controlling the pulp consistency or the concentration of the second raw material in the pulp utilize predicted future consistency changes or changes in the pulp concentration of the second raw material in the pulp.

· '. It is an essential idea of the invention that the pulp compartment of a paper machine adapted to produce a short circulation of a paper machine feed; the pulp to be processed by mixing one or more pulps, each pulp compartment comprising a plurality of successive mixing points where the pulps are mixed, the pulp is added to the pulp and / or the pulp is diluted by mixing 30 the dilution water is controlled by controlling the flow and / or consistency of one or more pulps entering the mixing point and / or the concentration of the second feedstock in the pulp and / or adjusting the flow and consistency of the pulp leaving the mixing point and / or concentration of the second feedstock. mass. The essential idea is to determine the consistency of one or more pulps entering the mixing point or the concentration of the second feedstock in the pulp, determine the consistency of the pulp leaving the mixing point or the concentration of the second raw material in the pulp entering one or more pulps. flow and mass flow from the mixing point. Further, the essential idea is to determine a consistency prediction of one or more pulps to the mixing point or a prediction of the concentration of the second raw material in the pulp, determine a flow rate from the mixing point, determine a consistency target for one or more pulps to another. the target concentration in the pulp and / or defining the consistency consistency of the pulp leaving the mixing point or the target concentration of the second raw material of the machine pulp in the pulp and determining the flow rate of one or more pulp flows to the mixing point and / or. Further, the essential idea is to control the flow and / or consistency of one or more pulps entering the mixing point and / or the concentration of the second feedstock in the pulp so that the flow of one or more pulps to the mixing point follows the determined flow target and / or consistency. / or the concentration of the second raw material in the pulp follows the target target concentration 20 and / or adjusts the flow and consistency of the pulp leaving the mixing point and / or the concentration of the second raw material in the pulp following the defined flow target and consistency. and / or the concentration of the second raw material in the pulp follows the determined target concentration.

·: 25 According to the essence of the invention, instead of a consistency forecast, it is possible

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use the predicted change in consistency and the mass of the pulp · · ·! change in concentration. According to a preferred embodiment of the invention, the control of the operation of the pulp compartment utilizes a model-predetermined control method 30 comprising a process model describing the process or part thereof and optimization so that the cost function associated with optimization is optimally controlled. According to another preferred embodiment of the invention, dynamic models are used as process models.

: 35 An advantage of the invention is that the pulp department is able to respond to changes in the production of the paper machine in a fast, precise and precise manner such as paper web breaks, paper machine start-up, grade changes, and speed changes. The present solution eliminates the very common oscillations of pulp compartments currents, surfaces, consistency and concentrations, and thus the effect of these interferences on paper quality, and allows for a much more accurate control over time than currently used methods.

The solution according to the invention is also quite similar in the manufacture of paperboard and tissue paper, and in the context of this description, the term '' paper 'is understood to mean not only paper but also paperboard and tissue paper.

The invention is explained in more detail in the accompanying drawings, in which Figure 1 schematically illustrates a pulp section of a papermaking machine, Figure 2 schematically illustrates the principle of controlling the flow of machine pulp, Figure 3 schematically illustrates Fig. 5 is a schematic representation of the dilution of a part mass after the osmosis tank; Fig. 6 is a schematic representation of the dispensing of a part mass from a mass tower; Fig. 7 is a schematic representation of the dilution of a part mass into a mass tower. after, t; Fig. 8 schematically shows the calculation of the fractional consistency estimate! Fig. 9 schematically illustrates the determination of a container outlet flow Figure 10 schematically illustrates the modeling of the dilution phase, Figure 11 schematically illustrates dosing into the mixing tank, Figures 12 and 13 schematically illustrate the flow to the container and Figure 14 schematically illustrates the principle of the control solution used in the solution of the invention.

Figure 1 schematically illustrates a pulp ": 35 compartment or a pulp making and dispensing line for a papermaking machine. The papermaking machine 8 is shown schematically in Fig. 1 by means of a rectangular box.

j in the pulp compartment according to j

j is formed of three intermixed particles OM1, OM2 and OM3. For the sake of clarity, only the OM1 metering of the first particle is shown in its entirety. The dispensing lines for the second particle OM2 and the third particle 5 OM3 are essentially similar. Partial mass OM1 dispensing line comprises particle OM1 acting as a storage tank 1. A mass pump 1 is fed by a first pump P1 along a feed tube 2 to a metering tank operating from a submassage tank 3 to a second pump via a second pump p 6, to which the partial masses OM2 and OM3 are led in a similar manner. The particle masses OM1, OM2 and OM3 begin to mix with one another in main line 6, but more efficient mixing of the particle masses OM1, OM2 and OM3 occurs only in the mixing / machine tank 5, which uses efficient mixers to mix the particle masses OM1, OM2 and OM3. From the mixing / machine reservoir 5, the machine mass KM formed by the partial pulps OM1, OM2 and OM3 is fed by a third pump P3 along the pulp dispensing tube 7 to the short circulation of the papermaking machine 8 and further to the headbox to feed the pulp. The pulp compartment of Figure 1 shows three intermixed pulps, but it will be appreciated that the number of pulps used to make the paper web may vary so that one or more pulps are used to make the web. Typically 2-6 parts by weight are used in the preparation. Further, in Fig. 1, the mixing tank and machine tank "are shown as a combined mixing / machine tank 5, but they can be, and usually are, physically separate tanks.

: The consistency of the pulp fed to the wire section of a papermaking machine typically ranges from 0.3 to 1.5%. In the upper part 1a of the mass tower 1, where the new fractional mass OM1 is fed, the consistency of the fractional mass OM1 is typically 10-14%. Thus, the pulp OM1 must be diluted before it can be pumped to 30 paper machines 8. The partial pulps OM1, OM2 and OM3 are diluted by adding dilution water to the pulp, which in the short run is fed to a consistency of about 3% KM. Typically, the dilution water is tap water separated from the papermaking machine 8 from short circuits, from which fibers and fines and ash are generally removed by means of a disk filter. Dilution of partial masses *! 35 is done in several steps. Fig. 1 shows the dilution of the partial mass OM1 immediately after the mass tower 1 at the mixing point DP6 of the first pump.

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! »I i» 10 115081 pun P1 to the inlet side with dilution water supplied through control valve V6 and dilution water channel DW6. At this point, the consistency of the pulp is diluted from a level of 10 to 14% to a level of 5 to 6%. Further, the particle mass OM1 is diluted after the particle mass reservoir 3 at the mixing point DP4 to the suction side 5 of the second pump P2 with dilution water supplied through control valve V4 and dilution water channel DW4, typically to a level of 3.2 - 3.5%. The particle dispensing line may have several particle bulk tanks and subsequent mixing points in succession, but for clarity only one particle mass reservoir 3 is shown in Figure 1. Also, a further mass dilution step is usually arranged between the physically separated mixing tank and the machine tank. Also in the lower part 1b of the massator 1, the fraction OM1 can be diluted by recycling and adding dilution water to the fraction OM1 at the mixing point DP7 via the control valve V7 and the dilution water channel DW7.

The size 15 of the pulp tower 1, the partial pulp container 3 and the mixing / machine container 5 depends on the production capacity of the paper machine 8 and the grades of paper produced therefrom, and therefore the size of the containers can vary considerably. When producing the same paper type, larger containers are used than when the paper type changes very often. Newsprint mills typically use large pulp towers 1 and fractional bulk tanks 3. In this case, pulp tower 1 can have a volume of up to thousands of cubic meters. In fine paper mills producing many types of paper, the pulp tower 1 or particle container 3 can only have a few tens of cubic meters. The mass tower 1 is usually considerably larger than the partial mass reservoir 3 and the mixing / machine reservoir • ·: · '5.

• · · i V 25 When adjusting the basis weight of the paper, the basis weight control unit 9 requests the required fiber flow or mechanical pulp KM. Since the fiber stream:. * ·· produces the desired basis weight on a paper machine, the solution for the basis weight control is: • «·

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30 MS · L · BW = F · Cs · k, (1) where MS is the machine speed on the reel [m / s],: 35 L is the width of the web on the reel [m],} 11 115081 BW is the fiber weight or paper dry weight, if the filler is not dosed [g / rn2], F is the flowrate KM [l / s],

Cs is the consistency of the machine mass KM in g / l and 5 k is a correction factor that takes into account the mass rotation loss and the proportion of rejects in the short cycle.

Since the basis weight control unit 9 cannot know the future pulp consistency variations, the term "3% consistency" is added to the machine pulp KM request, i.e. in all cases the desired fiber flow is directed to the paper machine 8. Machine pulp KM is pumped from mixing / machine container 5 by pump P3 along machine pulp dispensing tubes 7 for short circulation of paper machine 8. New pulp is pumped from the mixing tank to the machine tank so that the mass flows back through the overflow trap between the machine tank and the mixing tank all the time back into the mixing tank. This ensures constant conditions for pumping the machine mass KM, and accordingly the machine tank has a constant amount of machine mass KM at all times. The level of the mixing tank varies, and based on the measurement of the level of the mixing tank, the flow of the partial masses entering the mixing tank is adjusted to keep the surface of the mixing tank at the desired level. In a process dynamical man-agitator, the agitator is an integrating reservoir, which causes the agitator to adjust the level of the agitator slowly and leads to excesses, since when the outlet flow increases, for example, 0.01 m3 / s, the flow into the agitator must be temporarily adjusted to 0.02 m3 / sec. to the desired level. Thus, the individual change in the flow rate of the machine mass KM is gradually increased: V 25 per pulley towers up to 0.2 m3 / s, whereby the currently available control methods do not allow the BW to be adjusted sufficiently quickly and in a controlled manner. .

In the solution of the invention, the pulp compartment 8 of the paper machine; The control of the operation utilizes the ability of Model 30 Predictive Control (MPC) to calculate a prediction, i.e. incoming control commands, for the control messages required to control the operation of the mass department. These calculated control predictions are utilized by transmitting the flow information and forecast of the partial mass OM1, OM2 35 and OM3 determined on the basis of the flow information and prediction of the machine mass KM caused by the basis weight control unit 9, the adjustments utilize predicted future flow changes. Thus, based on the prediction of the feed flow of a particular tank, it is known how much mass will be pumped from the tank. Since it is also desired to control pulp dilution steps and pulp consistency, in addition to pulping flows, consistency data and consistency prediction along the dispensing line can be used to predict and account for pulping consistency variations in pulp flow changes by adjusting the fiber flow and pulverization.

In the following, the operation of the solution 10 according to the invention in connection with the adjustment of the basis weight of the paper web is examined. The operation of the pulp section can be subdivided and, for the sake of clarity, the solution according to the invention is presented by means of sub-processes describing the parts of the pulp section.

When adjusting the basis weight of the paper, the basis weight control unit 9 requests the required fiber flow or machine flow KM flow from the mixing / machine tank 5, from which the feed of the machine feed KM is controlled by the first control unit CONTROL! The first control unit CONTROL1 controls the metering of machine mass KM by controlling the third pump P3 or by controlling the flow control setpoint. Flow control can also be performed by the control valve installed after pump P3. Specially designed, 20 valves are known as the basis weight valve and have a very high accuracy. Generally, flow control can be accomplished by varying the valve opening, changing the pump speed or rpm, or in combination in these known ways. The basis weight BW of the paper web is measured at the dry end of the papermaking machine 8, for example just before the reel, whereby the basis weight control unit 9 requests • · *: V 25 the required machine flow KM based on the difference between the desired basis weight BW and the measured value. The flow control of the pulp KM forms the first sub-process 10, which is schematically shown; · | Fig. 2, which also shows the CONTROL1 of the first control unit. ·. action in block diagram representation. In the first step, the consistency estimate KMCsPr of the machine mass KM leaving the mixer / machine container 5 determined in the previous 30 rounds of calculation is read. Subsequently, the consistency of the pulp KM1, which may be either total consistency or fiber consistency, is measured and calculated from the pulp output consistency prediction KMCsPr and the measured pulp consistency DT1, the pulp consistency prediction DT1Pr. After this: 35, the mass flow rate FT1 is measured and the set mass flow control setpoint FIC1 is calculated and the target mass flowrate KMFFTr, i.e. the volume flow rate, at 3% consistency calculated by the basis weight control unit 9. Calculate from the calculated pulp consistency estimate DT1Pr, the measured pulp flow FT1, the pulp flow control setpoint FIC1 and the target pulp flowrate KMFFTr! Based on 5 model predetermined control MPC, the machine mass control message KMFmv, which may be the new flow control setpoint FIC1 or the corresponding actuator, in this case the pump P3 speed control message SIC 1. Calculate the new machine mass flow based on the measured machine mass flow FT1 10 how much of the mix / machine tank 5 is pumping machine pulp KM to the paper machine 8. The MPC model includes a response from the PID control setpoint to the flow. This is an advantageous alternative because known methods of control technology can be used to determine the response of the control circuit to how the control circuit must behave when changing the setpoint. According to known control circuit tuning methods 15, the control circuit can be tuned to provide that response. The MPC smooths the flow target control performance limits, optimizing the cost function of output error and control change. The KMFPr of the pulp flow is forwarded to the second control unit CONTROL2, which controls the metering of the OM1, OM2 and OM3.

Figure 2 does not show the dilution step between the mixing tank and the machine tank. If used, the solutions shown in Figures 4 and 5 for metering and diluting the partial mass OM1 can be applied.

• ·: ** Modern paper machine basis weight control calculates a number of future flow changes for fiber flow I t ·: 25 to form a future target trajectory. Based on this information and by calculating the incidence density curve of the preceding tank, it is possible to fit the optimal current • | the background rector that the flow control performs. Since the dilution step of this method is known as the pulp entering the mixing point, i.e. the consistency in the future, and the flow point and consistency target from the mixing point, the optimum dilution water or fractional flow achieving the flow control can be fitted. Similarly to the consistency of the pulp, it is possible to monitor the concentration of another feedstock raw material, such as various fillers, additives or chemicals in the pulp, in addition to or instead of the pulp consistency. concentrations of chemicals in the pulp. Both diluent water and several different fillers, additives and chemicals can be added at the same mixing point, which is usually before the pump. Fillers, additives, or chemicals may also be fed into a feed tank without dilution. For the sake of clarity, the figures do not show the addition of fillers, additives or chemicals to the pulp or particle mass or the measurement of their concentrations in the pulp.

Figure 14 schematically illustrates the principle of pattern prediction control. Model Predictive Control (MPC) is a technique known per se in control technology 10. Fig. 14 is a schematic representation of a control message 12 or a control variable 12 and a measurable or controllable quantity 13. The time t0 is adapted to correspond to the current time at which the historical information of the control variable 12 and the controlled variable 13 is available. The solution of the invention utilizes the ability of the MPC to calculate a prediction based on the process output 15, i.e., the controllable quantity 13, based on the MPC's ability to compute prior process control variables, measurements, predicted interference , whereby MPC can be used to solve the process control problem with the available control variables, i.e. manipulable quantities, such that the process output quantities, i.e., the controllable or controllable quantities, are as close as possible to the target value at each instant. A number of future control changes 16 calculated for control variable 12 by adjustment and optimization are shown as as-· · · · · · · The target value controlled by the MPC 25 can also be used as a time-dependent variable value, i.e. a target value tracer 14, which can be adapted to start from the last measured value of the controllable quantity 13, or can be predefined, ·: ··· Example. Further, Fig. 14 shows a control. * ·. projections 15a and 15b calculated for size 13. Prediction 15b corresponds to the situation that occurs if no new control measures are performed. This corresponds to the initial optimization situation. As the optimization decreases, control changes 16 result in a process output prediction 15a, which is the result of control measures. The adjustment takes the first action and the adjustment interval dt; ··· After t0 + dt, the new control changes are calculated accordingly. Thus, in addition to process 35 simulations, model predetermined control includes, as an integral part, optimization, which determines future process controls for the desired operation of the process on the basis of predicted interference rates, a cost function that represents goodness or purpose, and constraints on optimization. Thus, the invention utilizes the ability of the MPC technology cost optimization function to fine both process output error and control change calculated by the weather controller. In this way, the operation of the process can be stabilized and so-called soft, or slow-acting, changes can be made, but the changes are timely. There is an abundance of literature on model-based control, including D. Clarke, Advances in Model-Based Predictive Control, Oxford Science Publications, 1994, and R. Soeterboek, Predictive Control A Unified Approach, Prentice Hall, 1992.

The dynamic process models for the mass production process used in the solution of the invention are fully known per se. For example, Donald P. Campbell, Process Dynamics, John Wiley & Sons, 15 Inc., 1958, describes the basic theory for creating dynamic models of physical processes. Thus, the invention provides a solution for linking generic models of process dynamics and model predetermined controls. The present invention utilizes the ability of dynamic models to compute a prediction of process flows, surfaces, and consistency, and the ability of model predictions to predict a prediction of the last process measurement and utilize it in control computation. In addition, model-driven control intelligently links consecutive control rounds, both by finishing control changes and by utilizing historical information on control changes from previous control rounds. The present invention utilizes the ability of the MPC to calculate a prediction for the control: V 25 message, i.e., incoming control commands. This control prediction is utilized by moving the process flow through the flow prediction caused by the basis weight adjustment or other similar action, such as species change: · · backward, whereby the forward flow controls utilize the predicted future flow changes, thus supplying the tank feed. knows how much of the tank will be pumped. Because of the need to control dilution processes and consistency in addition to flows, dynamic process models can predict and take into account the fluctuation in consistency of the process, both in fiber flow control and in flow control. In this case, the calculation is progressive.

35 shows schematically the determination of the total flow of the partial masses OM1 to OM3 into the mixing / machine vessel 5 which forms a second sub-process 20. FIG. 3 also shows a block diagram representation of the internal control of the second control unit controlling the second part 20. Particle mass flows FTS ^ n, where n is the number of particle masses, and the mixing tank surface height LT2 are measured and the mixing / machine tank 5 surface height gradient LT2Tr is calculated. In addition, the mechanical pulp flow estimate KMFPr calculated in the first subprocess 10 is read. The partial flow target OMFTr of the partial masses is then calculated using MPC. Once the target flow path OMFTr for the total flow to the mixer / machine container 5 is calculated, the consistency measurements of the partial masses are read from 10 DT3i., And the consistency predictions of the output of the bulk container from the previous calculation round of OMCsPri. Based on these, the consistency estimate DT3Pri.n for each particle mass j is calculated. Since a certain amount of each mass is desired, and the ratio of the masses is also desired, equations (7), (8a), (8b) and (8c) 15 presented below are used to calculate the flow target OMFTri for each particle.

Figure 4 shows the dispensing of the partial mass OM1 from the partial mass reservoir 3, which constitutes a partial process 30 controlled by a third control unit CONTROL3. Figure 4 also illustrates the internal operation of the third control unit 3 which controls the third subprocess 30 as a block diagram presentation 20. Fig. 4 shows only the dispensing of the partial mass OM1 from the dispensing container 3, but the principle shown in Fig. 4 applies in a similar manner to all sub-masses OM1, OM2 and OM3, therefore sub-index 1 denoting the partial mass OM1 is omitted. First read -. * “The partial flow mass FT3, the partial mass flow control setpoint FIC3, and: the partial flow mass target OMFTr calculated by 25 other control units CONTROL2.

• * »_ The MPC then calculates the partial flow control FT3, the partial flow control set point FIC3, and the partial flow target ·: ·· OMFTr, which may be a new flow; ··. control setpoint FIC3 or the corresponding actuator, in this case pump S2 speed control message SIC3. Based on the OMFmv of the partial mass control message and the measured flow FT3 of the partial mass, the partial mass is further calculated; flow forecast FT3Pr. The flow prediction FT3Pr of the fractional OM1 is transmitted to the fourth control unit ß CONTROL 4 controlling the dilution of the fractional OM1 and to the control unit 5 controlling the dispensing of the fractional OM1 from the mass tower 1.

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Fig. 5 schematically shows the dilution of the fractional mass OM1 after the fractional mass container 3, which constitutes the fourth subprocess 40, which is controlled by the fourth control unit CONTROL4. Figure 5 also shows an internal operation of the fourth control unit 4 for controlling the fourth subprocess 40 as a block diagram representation. If multiple dilution steps are used, each dilution step is done in the same way. Similarly, Figure 5 also applies to particle masses OM2 and OM3. First, the consistency estimate of OMCsPr from the particle tank 3 output calculated in the previous round is read. The partial consistency, either total or fiber consistency, DT3 is then measured, and the partial consistency consistency DT3Tr is calculated to drive the consistency to the desired target value. DT3Tr can also be a predefined consistency target that does not change over time. The dilution water flow FT4 is then measured and both the dilution water flow control setpoint FIC4 and the 15-flow flow prediction FT3Pr calculated by the third control unit CONTROL3 are read. Then calculate the particle tank outlet consistency prediction OMCsPr, the fractional consistency trajectory DT3Tr, the measured dilution water flow rate FT4, the dilution water flow control setpoint FIC4, and the partial flow flow prediction FT3Pr using the dilution control, flow control setpoint. Based on the dilution water control message DFmv, the dynamic process model, and the measured dilution water flow FT4, the dilution water flow prediction FT4Pr is calculated and transmitted to the fifth control unit CONTROL5 for controlling particle dose OM1 dose i '**. Sat · ·: 25 calculates the consistency prediction DT3Pr, which is transmitted to the third control unit CONTROL3, and the mixing / machine container 5 output consistency predictive process model.

·: ·· ;. Figure 6 schematically illustrates the dispensing of a partial mass OM1 from a pulp tower 1 which constitutes a fifth sub-process 50 controlled by a fifth control unit CONTROL5. Figure 6 also shows the internal operation of the fifth control unit 5 controlling the fifth sub-process 50; block diagram representation. Similarly, Figure 6 also applies to the partial constituents OM2 and OM3. First, the surface height ί LT1 of the partial mass container 3 is read and the target height trajectory LT1Tr is calculated, which is used to drive the surface of the container to the desired height. The partial flow rate FT5 is then measured and the partial flow rate set point FIC5 is read. In addition, 18 115081 further calculates the flow forecast FT3Pr - FT4Pr of the 3 outlets of the bulk container. Thereafter, the MPC calculates the partial mass flow rate FT5, the partial mass flow control setpoint FIC5, the partial mass tank 3 outlet flow forecast FT3Pr - FT4Pr, and the partial mass container 3 surface height target 5 with the setpoint traverse LT1Tr which can be set to the speed control signal SIC5 of the corresponding actuator, in this case pump P1. On the basis of the partial mass control message OMFmv and the measured partial mass flow rate FT5, the partial mass flow prediction FT5Pr is transmitted to the sixth control unit 6 for controlling the dilution of 10 partial mass OM1 to be dispensed from the mass tower 1.

Figure 7 shows the dilution of the partial mass OM1 after the mass tower 1, which constitutes the sixth sub-process 60, which is controlled by the sixth control unit CONTROL6. Figure 7 also shows a block diagram representation of the internal operation of the sixth control unit 6 which controls the sixth sub-15 process 60. Fig. 7 also applies in a similar way to the partial masses OM2 and OM3. First, the calculated consistency forecast MTCSPr of the mass tower 1 output calculated in the previous round is read. The partial consistency, either total consistency or fiber consistency, DT5 is then measured and the 20 partial density target DT5Tr is calculated to direct the consistency to the desired target value. Further, the dilution water flow FT6 is measured and the dilution water flow control set point FIC6 is read, as well as the partial mass flow prediction FT5Pr as determined by the Fifth Control Unit CONTROL5. Thereafter: * ·· calculate the MTCsPr of the calculated consistency of the mass tower output with the MPC, DW6 control valve V6. ···. position or FIC6 setpoint for flow control. Based on the dilution water control message 30 DFmv and the measured dilution water flow FT6, the dilution water flow prediction FT6Pr is calculated. Also calculated after the dilution step; keystone consistency consistency prediction DT5Pr, which is transmitted after the mixing point to the * keystore output consistency predictor process model. The dilution water flow prediction FT6Pr and the measured dilution water flow FT6 are further transmitted: 35 mass dilutions to the seventh control unit 7B to control the lower part 1b of the mass tower 1, if such dilution is applied to the lower part 1915081a 1b. In its function, the seventh control unit CONTROL7 is similar to the sixth control unit CONTROL6. The output consistency MTCsPr of the mass tower 1 can be determined by taking into account the effect of dilution water flow on the lower part 1b of the mass tower 1, measuring the consistency of the partial mass 5 from the mass tower 1 by any indirect method or statistical methods.

Figure 8 is a block diagram showing the calculation of the consistency estimate of the partial mass OM1. The one shown in Fig. 8 applies in a similar manner also partial masses OM2 and OM3. In the first step, the flow forecast FT5Pr and the consistency forecast DT5Pr of the mass flow into the partial mass container 3 are read. At the same time, the partial flow mass FT5 and the partial mass consistency DT5 are measured. From these four quantities, the feed consistency prediction of the particle container 3 or the fiber flow prediction F5CsinPr is calculated. The partial height LT1 of the partial mass reservoir 3 is measured and read as the LT1Pr of the partial mass reservoir 3 and the FT3Pr of the partial mass flow prediction and the FT4Pr of the dilution water to be added to the mass after the partial mass reservoir 3. On the basis of these four large and fractional mass feed predictions, F5CsinPr, the volume prediction of the partial mass reservoir 3, VOMSPr, and the partial mass reservoir 3, OMSCsPr, are calculated from the two mass and partial volumetric computations FT3Pr, and the dilution water

Fig. 9 schematically illustrates the determination of the outlet flow of a container, particularly a machine container or the last particle bulk container of a dispensing line, without a dilution step. The consistency of the flow from the tank at the measurement point can be calculated from the formula • »·

Cs (t) = Csto (t - tdl) - Csto (t0 - tdl) + Cs (tO), (2) 30 where Cs (t) is the tank outlet consistency [g / l],

Csto (t) is the consistency of the mass in the tank [g / l],! t0 is the time of calculation, tdl is the time delay from the tank to the consistency measurement due to flow, and i 35 t is the time in the future after moment of calculation tO.

20 115081

Equation (2) corrects the effect of errors in the process model. The desired flow at the mixing point in the future can in turn be solved by the formula 5 F (t) = FF (t) / Cs (t - td2), tmax> t> tO, (3) where td2 is the flow delay from the consistency measurement to the mixing point SP and 10 F (t) is the output flow [l / s] and FF (t) is the desired fiber flow.

The modeling of the dilution phase, in turn, can be represented schematically by means of Figure 10. The outlet consistency of the container can be calculated from the formulas

Cstou (t0-td3-td4) = - nCS (^ F <l ~ f * (4) F (t0-td4) -F2 (t0-td4)

Cstou (t) = Csto (t) - Csto (t0 - td3 - td4) + Cstou (t0 - td3 - td4) and (5) 20 F2 (t) = F (t) f 1 - ^ Cs (t + td20 (6)

V Cstou (t-tdl) J

where Cstou (t) is the outlet consistency of the container [g / l],

Cs (t) is the output consistency [g / l],

Csto (t) is the tank consistency [g / l], * 25 F (t) is the outlet flow [l / s], V ·! F2 (t) is the dilution water flow in the dilution step [l / s], t0 is the counting time, td3 is the flow delay from the tank to the mixing point, 30 td4 is the flow delay from the mixing point to consistency measurement and t is the time to future counting time t0.

: 35 Equations (4) to (6) can be used to determine the level of consistency of the container outlet at the start of the count. This level calibrates the measurements so that the material balance is maintained. The consistency of the container is derived from the output consistency taking into account the predicted changes in the density of the container.

The dosing into the mixing tank is schematically represented by the formulas (7) and (8a) to (8c) of Figures 11 and 5: X (t) = - K 2 K 3 '^ 1 (t-tdl) + Cs 2 (r ^ t ^ + Cs3 (t ^ td3j K1 F, (t) = CsT (rS) X (,) · <8a) 10 K2 F2 (t) = c ^ n) X (t) '(8b) K3 F3 (t) = cS (r ^ x (t) '<8c) 15 where X (t) is the total fiber flow determined by the feed densities, F (t) is the desired total flow rate [l / s], K1 is the desired fiber fraction of OM1, .. Fl (t ) is the partial flow of OM1 fiber fraction K.1- ** the mass flow of OM1 [l / s] 20 masses,> * »: 'K2 is the desired fiber fraction of OM2 and F2 (t) is the partial fiber fraction of OM2 K2,': mass flow OM2 [l / s], '': K3 is the desired fiber mass fraction of OM3 and 25 F1 (t) is the flow mass [l / s] corresponding to the mass fraction K3 of OM3 mass fraction.

'·

When dispensing to the mixing tank, the desired flowrate flow rate is determined simultaneously so that both the total flow target and the desired fiber fraction target are simultaneously achieved. Instead, the overall consistency goal cannot be met. The equations shown do not take into account, for example, the changes between the inlet and return flow of the wafer filter 11, but are eliminated in the tank level control, whereby it can be assumed that the fiber flow to and from the wafer filter 11 is the same.

The flow modeling of the container is schematically shown in Figures 12 and 13 by means of a particle container 3. The flow to the tank can be modeled using formulas

Fi (t) = Fo (t) + A (LTr (t)), (8) 10 LTr (t) = f (Lsp, L (tO)), tmax> t> t0, (10) where Fi (t ) is the inlet flow into the tank [l / s],

Fo (t) is the outlet flow rate from the tank [l / s], L (t) is the tank surface height [m], 15 LTr (t) is the desired height change curve,

Lsp is the desired surface height and A is the surface area of the tank at height L.

Depending on the difference between the measurement and the setpoint, different target functions LTr (t) can be used. Furthermore, if the process is accompanied by an unknown disturbance flow, its effect can be eliminated by means of control techniques known per se.

Thus, the solution of the invention utilizes the normal! · · The process operation and all mass departments can be adjusted according to the solution presented. In addition, the solution is also well suited for water circulation management, whereby controlling the inlet and outlet of the tanks can be used to control the water volumes and flows of the tanks. The solution leverages the ability of the MPC- optimization cost function to fine both process output error and controller-calculated control change. In this way, the operation of the process can be stabilized and so-called soft, i.e. slow-acting, but timely control measures can be provided. The solution presented below enables accurate monitoring of individual measurements, actuators and controls, and alerts the operator if the process does not perform as predicted by the models.

Thus, almost all mixing tanks also have a 35 disk filter 11 or other fiber recovery apparatus shown in Figure 1. The disc filter 11 provides a long-fiber pulp (Sweetener) to which the fines and filler are bonded. In the solution presented, it is assumed that both the mass entering and leaving the disk filter 11 is in equilibrium both in terms of consistency and flow, i.e., the sum flow and the sum fiber flow are zero. If this is not the case, both currents and their densities can be taken into account in calculating the control2 of the second control unit.

The drawings and the description related thereto are intended only to illustrate the idea of the invention. The details of the invention may vary within the scope of the claims. Thus, it is clear that the solution of the invention is used for continuous control of the pulp compartment, i.e., it is not intended to be used only during change situations such as adjusting the basis weight or any other change in the product being manufactured. In addition to the production of paper and board pulp, the solution disclosed below can be used in other chained processes in which changing and leveling of consistency and concentration constitute a significant factor in the process. The control units used to control the operation of the mass department are preferably based on a microprocessor or a signal processor from the data processing unit, where at least some of the required functions can be implemented programmatically. A single control unit could be used to control the operations of the mass department, which would perform all the necessary functions, but preferably the functions would be implemented in a decentralized manner in several different control units. All sensors or other measuring devices known per se can be used to measure flows, densities and concentrations.

*> • »'>« »·' · 1)» t

Claims (42)

A method of controlling a pulp compartment's function in a papermaking machine, which pulp compartment is arranged to produce machine pulp 5 (KM), which is measured in the short circulation of the papermaking machine (8), by either a sub-pulp or several sub-pulp (OM1, OM2, OM3 ) by mixing these with each other and which pulp compartment comprises a plurality of consecutive mixing points (DP4, DP6) where the sub-masses (OM1, OM2, OM3) are mixed with each other, the other raw material of the pulp is mixed to the pulp 10 (KM, OM1, The OM2, OM3) and / or the pulp (KM, OM1, OM2, OM3) are diluted by mixing dilution water to the pulp (KM, OM1, OM2, OM3), and in which method the flow and / or consistency of one or more tiles is controlled. a mixing point (DP4, DP6) incoming masses (KM, OM1, OM2, OM3) and / or the concentration of other raw material in the mass (KM, OM1, OM2, OM3) and / or controlled from a mixing point (DP4, DP6) ) outgoing mass (KM, OM1, OM2, OM3) flow (FT1, FT3, FT5) and consistency (DT1, DT3, DT5) and / or the concentration of other raw material in the mass (KM, OM1, OM2, OM3), characteristic watt: ·, one defines the consistency for one or more tili at a mixing point * 4 ·!,. (DP4, DP6) incoming masses (KM, OM1, OM2, OM3) or the concentration of the machine pulp / other raw material in the mass (KM, OM1, OM2, OM3) and it is defined from a mixing point (DP4, DP6) consistency of the pulp (KM, OM1, OM2, OM3) (DT1, DT3, DT5) or other mass of the raw material in the pulp (KM, OM1, OM2, OM3) v: defining the flow for one or more tile mixing points (DP4, DP6) incoming masses (KM, OM1, OM2, OM3) and the flowing mass (KM, OM1, OM2, OM3) of the mixing point (DP4, DP6), defining (FT1, FT3, FT5), defined a consistency prediction (KMCsPr, OMCsPr) of one or more incoming masses (KM, OM1, OM2, OM3) of the mass of incoming mass (KM, OM1, OM2, OM3) or a prediction of the concentration of the other raw material in the mass (KM, OM1, OM2); OM3), defining a flow prediction (KMFPr, FT3Pr, FT5Pr) for the exiting mixing point (DP4, DP6) sense (KM, OM1, OM2, OM3) flow (FT1, FT3, FT5), a consistency melt is defined for the consistency of one or more incoming masses (DP4, DP6) incoming masses (KM, OM1, OM2, OM3) or melt concentration for the other raw material of the machine stock in the pulp (KM, OM1, OM2, OM3) and / or defining a consistency meal (DT3Tr, DT5Tr) for the consistency (DT1, DT3, DT5) of the pulp (KM4, DP6) departing mass (KM, OM1, OM2, OM3) or the melt concentration of the other raw material of the machine mass in the pulp (KM, OM1, OM2, OM3), defining a flow melt for the flow of one or more to the mixing point (DP4, DP6) incoming masses (KM, OM1 , OM2, OM3) and / or a flow target (KMFFTr, OMFTr) for the flow of the mass (KM, OM1, OM2, OM3) flowing from the mixing point (DP4, DP6) (FT1, FT3, FT5) and controlling the flow. / or the consistency of one or Hera to the mixing point (DP4, DP6) incoming masses (KM, O M1, OM2, OM3) and / or the concentration of other raw material in the pulp (KM, OM1, OM2, OM3) on the basis of the prediction of the mass (KM, OM1, OM2, OM3) flow prediction (KMFPr) from the mixing point (DP4, DP6) , FT3Pr, FT5Pr) and / or consistency prediction (KMCsPr, OMCsPr) for one or more masses entering the mixing point (DP4, DP6) (KM, OM1, OM2, OM3): ·. and / or the concentration prediction for the other raw material of the machine mass, such that the flow of one or more tiles entering the mixing point (DP4, DP6) following masses (KM, OM1, OM2, OM3) follows the determined flow target and / or the consistency follows the particular consistency meal and / or the concentration of the other raw material of the pulp in the pulp (KM, OM1, OM2, OM3):: follows the determined milk concentration and / or \: it is controlled from the mixing point (DP4 , DP6) Exhaust flow (KM, OM1, OM2, OM3) flow (FT1, FT3, FT5) and texture (DT1, DT3, DT5) and / or the concentration of other raw material in the pulp (KM, OM1, OM2, OM3) based on the flow prediction from the mixing point (DP4, DP6) of the mass (KM, OM1, OM2, OM3) flow prediction (KMFPr, FT3Pr, FT5Pr) and / or the consistency prediction (KMCsPr, OMCsPr) of one or more to the mixing point (DP4) , DP6) incoming masses (KM, OM1, O M2, OM3) and / or consistency prediction of the other material of the machine mass so that the flow of the mass (KM, OM1, OM2, OM2, OM3) flowing from the mixing point (DP4, DP6) (FT1, FT3, FT5) follows the determined flow template ( KMFFTr, OMFTr) and the consistency (DT1, DT3, DT5) follow the determined consistency meal (DT3Tr, DT5Tr) and / or the concentration of the other raw material in the pulp (KM, OM1, OM2, OM3) follows the determined flour concentration. 2. A method according to claim 1, characterized in that the second frame material of the machine stock is a filler, an additive or a chemical. 3. A method according to claim 1 or 2, characterized in that the flow of the machine mass (KM) is controlled from a mixing / machine container (5) in the pulp compartment such that a control message (KMFmv) for the flow of the machine mass (KM) is defined on the basis of the consistency prediction of the machine mass (KM). (KMCsPr), machine mass (KM) flow (FT1), a setpoint (FIC1) for machine mass (KM) flow regulation, and a setpoint trajectory (KMFFTr) for machine mass (KM) fiber flow and machine mass (KM) flow are controlled from mixing / machine flow. the holder (5) on the basis of said control message (KMFmv) for the machine mass 20 (KM). ·. 4. A method according to claim 3, characterized by •. machine mass (KM) flow prediction (KMFPr) is defined as:,; * basis of measured mass of the mass of the machine (KM) (FT 1) and the control message • «'' (KMFmv) of the mass of the machine (KM) and '·” the dosage of the sub-masses (OM1, OM2, OM3) and / or the other of the mass frame material is controlled on the basis of machine mass (KM) Current prediction (KMFPr). Method according to claim 4, characterized in that the total flow targets (OMFTr) of the sub-masses (OM1, OM2, OM3) are defined on the basis of the measured flows of the sub-masses (OM1, OM2, OM3), a setpoint trajectory (LT2Tr) for the surface level of the mixing / machine container (5); · In and machine mass (KM) flow prediction (KMFPr). 115081 40 6. A method according to claim 5, characterized in that respective partial mass (OM1, OM2, OM3) consistency prediction (DTSPn.n) is defined on the basis of a consistency prediction (OMCsPri.n) for a partial mass container (3). output and the consistency of the measured mass (OM1, OM2, OM3) (DT3 ^). 7. A method according to claim 6, characterized in that the respective partial mass (OM1, OM2, OM3) flow target (OMFTrn) is defined on the basis of the respective prediction (DT1, OM2, OM3) consistency prediction (DT3Pri.n) and the sub-masses. (OM1, OM2, OM3) total flow targets (OMFTr). 8. A method according to claim 7, characterized in that the dosing of the respective sub-mass (OM1, OM2, OM3) from the sub-mass container (3) is controlled so that a control message (OMFmv) for the sub-mass (OM1, OM2, OM3) flow is defined on the basis of the flow. (FT3) of the sub-mass (OM1, OM2, OM3) from the sub-mass container (3), a setpoint (FIC3) for the sub-mass flow (OM1, OM2, OM3) flow control and the sub-mass (OM1, OM2, OM3) flow rate (OMFTr) and the dosing of the sub-mass (OM1, OM2, OM3) from the sub-mass container (3) is controlled on the basis of said control message (OMFmv) for the sub-mass (OM1, OM2, OM3). • · Method according to claim 8, characterized in that the flow prediction (FT3Pr) of the sub-mass (OM1, OM2, OM3) flowing from the sub-mass container (3) is defined on the basis of the control message (OMFmv): for the sub-mass (OM1, OM2). ) and the sub-mass (OM1, OM2, OM3) measured flow (FT3). Method according to claim 9, characterized in that the dosage of the sub-mass (OM1, OM2, OM3) is controlled from a massager (1) on the basis of the flow prediction (FT3Pr) of the sub-mass (OM1, OM2, OM3). A method according to claim 9 or 10, characterized in that the dilution of the sub-mass (OM1, OM2, OM3) flowing from the diluted water container (3) with dilution water is controlled so that a control message (DFmv) for the dilution water flow -finished on the basis of the consistency prediction (OMCsPr) of the output of the sub-mass container (3), the setpoint trajectory (DT3Tr) for the consistency of the mass (OM1, OM2, OM3) (DT3), the dilution water's measured flow (FT4), a set-point flow rate (FIC4) and the flow prediction of the sub-mass (OM1, OM2, OM3) (FT3Pr) and the dilution water flow are controlled on the basis of the defined dilution water control message (DFmv). 12. The method of claim 11, characterized by the dilution water flow prediction (FT4Pr) being defined on the basis of the dilution water control message (DFmv) and the dilution water's measured flow (FT4). 13. A method according to claim 12, characterized in that the dosing of the sub-mass (OM1, OM2, OM3) is controlled from the mass compartment (1) of the pulp compartment 15 on the basis of the dilution water flow prediction (FT4Pr). 14. A method according to claim 13, characterized in that the dosing of the sub-mass (OM1, OM2, OM3) from the pulp tower (1) is controlled so that! a control message (OMFmv) is defined for the sub-mass (OM1, OM2, 20 OM3) flowing from the pulp tower (1) to the sub-mass container (3) on the basis: ·. of the flow rate of the sub-mass (OM1, OM2, OM3) flowing from the pulp tower (1), a setpoint (FIC5) of the sub-mass (OM1, OM2, OM3) * flow control, a flow prediction (FT3Pr-FT4Pr) for the sub-mass'; · *! (OM1, OM2, OM3) leaving the bulk container (3) and setpoint trajectory; The surface level (LT 1Tr) tower in the sub-mass container (3) and * the dosing of the sub-mass (OM1, OM2, OM3) from the pulp tower (1) is controlled on the basis of the defined control message (OMFmv) of the sub-mass (OM1, OM2, OM3). The method according to claim 14, characterized in that the flow prediction (FT5Pr) of the sub-mass (OM1, OM2, OM3) as the current from the pulp tower. (1) to the sub-mass container (3) is defined on the basis of the control message (OMFmv) of the sub-mass flowing (OM1, OM2, OM3) and of the sub-mass (1) flowing of the sub-mass 1 (OM1, OM2), OM3) measured flow (FT5). 16. A method according to claim 15, characterized in that the dilution of the sub-mass (OM1, OM2, OM3) flowing from the mass tower (1) to the sub-mass container (3) with dilution water is mixed in the sub-mass (OM1, OM2, OM3) are controlled so that the control message (DFmv) for the dilution water flow is defined on the basis of the consistency prediction (MTCsPr) of the mass flow (1), a setpoint prediction (DT5Tr) for the consistency the pulp tower (1) flowing sub-mass (OM1, 10 OM2, OM3), the dilution water's measured flow (FT6), a set point (FIC6) for the dilution water flow control and the flow prediction (FT5Pr) of the pulp stream (OMT1) , OM3) and the dilution water flow (FT6) is controlled on the basis of the defined dilution water control message (DFmv). 17. A method according to any of the preceding claims, characterized in that the consistency (DT1, DT3, DT5) of one or more masses entering the mixing point (DP4, DP6) or from the mixing point (KM, OM1, OM2, OM3) is defined. ) or the concentration of the other raw material of the pulp in the pulp (KM, OM1, OM2, OM3) by measurement or indirectly using a process model describing the function of the pulp compartment or part thereof. . ; A method according to any of the preceding claims, characterized in; characterized by defining the flow (FT 1, FT3, FT5) of one or more incoming or from the mixing point (DP4, DP6) incoming or from the mixing: puncture leaving masses (KM, OM1, OM2, OM3) by measurement or indirectly using a process model that describes the function of the pulp department or part thereof. Process according to any of the preceding claims, characterized by defining a control message comprising several future control steps for the machine mass (KM), a sub-mass (OM1, OM2, OM3) or the flow of the other raw material of the machine mass. a setpoint trajectory (KMFFTr, OMFTr) for the machine mass (KM), a partial mass (OM1, OM2, OM3) or the flow of the other raw material, a setpoint trajectory (LT1Tr, LT2Tr) for surface level in the mixer / machine container (5) or partial mass container (3), and / or a control message comprising several future control steps for the dilution water flow (FT4, FT6) using a model predictive control method that includes a process model describing the pulp compartment or part thereof and optimization so that it is optimized. the ring-related cost function is minimized. 20. A method according to any of the preceding claims, characterized by the process model being a dynamic process model. 21. Device for controlling the function of a pulp compartment in a papermaking machine, which pulp compartment is arranged to produce machine pulp (KM), which is measured in the short circulation of the papermaking machine (8), by either a sub-pulp or several sub-pulp (OM1, OM2, OM3 ) by mixing these with each other and which pulp compartment comprises a plurality of consecutive mixing points (DP4, DP6) where the sub-masses (OM1, OM2, OM3) are mixed with each other, the other raw material of the machine mass is mixed to the mass 20 (KM, OM1, OM2, OM3) and / or the pulp (KM, OM1, OM2, OM3) are diluted by mixing dilution water to the pulp (KM, OM1, OM2, OM3), and which device is arranged to: v: regulate the flow and / or consistency of one or more incoming masses (KM, OM1, OM2, OM3) to a mixing point (DP4, DP6) ·; And / or the concentration of the second raw material of the machine stock in the pulp (KM, OM1, ell OM2, OM3) and / or regulate the flow (KM, OM1, OM2, OM3) flowing from a mixing point (DP4, DP6) ( FT1, FT3, FT5) and texture (DT1, DT3, DT5) and / or the concentration of the other frame materials in the mass: * 30 (KM, OM1, OM2, OM3), characterized in that the device is arranged to define the consistency of a or more to a mixture point (DP4, DP6) incoming masses (KM, OM1, OM2, OM3) or the other raw material's concentration in the mass (KM, OM1, OM2, OM3) and define it from a mixing point (DP4, DP6) the consistency of the pulp (KM, OM1, OM2, OM2, OM3) consistency (DT1, DT3, DT5) or the concentration of the other frame material in the pulp (KM, OM1, OM2, OM3), define the flow of one or more to the mixing point (DP4, DP6 ) incoming masses (KM, OM1, OM2, OM3) and the exiting mass (KM4, DP6, DP6) , OM1, OM2, OM3) flow (FT1, FT3, FT5), define a consistency prediction (KMCsPr, OMCsPr) of one or more masses (KM, OM1, OM2, OM3) consistency or prediction for the concentration of the second raw material of the machine stock in the pulp (KM, OM1, OM2, OM3), define a flow prediction (KMFPr, FT3Pr, FT5Pr) for the pulp (KM, OM1, OM2, OM3) exiting from the mixing point (DP4, DP6) flow (FT1, FT3, FT5), define a consistency flour for the consistency of one or more masses entering the mixing point (DP4, DP6) (KM, OM1, OM2, OM3) or melt concentration for the other raw material in the mass (KM, OM1, OM2, OM3) and / or define a consistency melt (DT3Tr, DT5Tr) for the consistency (DT1, DT3, DT5) of the mass from the mixing point (DP4, DP6) leaving the mass (KM, OM1, OM2, OM3) or the melt concentration of the machine. pulp's other raw material in the pulp (KM, OM1, OM2, OM3), define a flow mass for the flow of one or more tiles entering the mixing point (DP4, DP6) (KM, OM1, OM2, OM3) and / or a flow message (KMFFTr, OMFTr) for the outgoing mass of the mixing point (DP4, DP6) (KM, OM1) , OM2, OM3) flow (FT1, FT3, FT5) and 'regulate the flow and / or consistency of one or more mixing point (DP4, DP6) incoming masses (KM, OM1, OM2, OM3)' ': and / or the concentration of the other raw material of the pulp in the pulp (KM, OM1, · · OM2, OM3) on the basis of the flow prediction of the pulp (KM, OM1, OM2, OM3) from the mixing point (KM, OM1, OM2, OM3) (KMFPr, FT3Pr, FT5Pr ) j and / or consistency prediction (KMCsPr, OMCsPr) for one or more tili mixes *. masses (DP4, DP6) incoming masses (KM, OM1, OM2, OM3) and / or the concentration prediction of the other raw material of the machine mass so that the flow of one or more to the mixing point (DP4, DP6) is received by masses (KM, OM1, OM2, OM3) follow the determined flow agent and / or the consistency follows the determined consistency meal and / or the concentration of the second frame material of the pulp in the pulp (KM, OM1, OM2, OM3) follows the determined mill concentration and / or regulate it from the mixing point ( DP4, DP6) flow of the pulp (KM, OM1, OM2, OM3) flow (FT1, FT3, FT5) and consistency (DT1, DT3, DT5) and / or the concentration of other raw material in the pulp (KM, OM1, OM2, OM3) ) on the basis of the flow prediction (KMFPr, FT3Pr, FT5Pr) and / or consistency prediction (KMCsPr, OMCsPr) of one or more of the mixing point (DP4, DP6) departing from the mixing point (DP4, DP6) ) incoming masses (KM , OM1, OM2, OM3) and / or the consistency prediction of the other frame material of the machine mass such that the flow of mass (KM, OM1, OM2, OM2, OM3) exiting from the mixing point (DP4, DP6) follows the determined flow target I (KMFFTr, OMFTr) and consistency (DT1, DT3, DT5) follow the determined consistency meal (DT3Tr, DT5Tr) and / or the concentration of other raw material in the pulp (KM, OM1, OM2, OM3) follows the determined mälkoncentra reaction. 22. Apparatus according to claim 21, characterized in that the other raw material of the machine stock is a filler, an additive or a chemical. Device according to claim 21 or 22, characterized in that the device is arranged to control the flow of the machine mass (KM) from a mixing / machine container (5) in the pulp compartment so that the device is arranged to: ·· *. define a control message (KMFmv) for machine mass (KM) flow on the basis of machine mass (KM) consistency prediction (KMCsPr), t '! machine mass (KM) flow (FT 1), a setpoint (FIC1) for the machine mass! (KM) flow control and a setpoint trajectory (KMFFTr) for machine worm (KM) fiber flow and control of machine mass (KM) flow from the mixer / machine container (5) on the basis of said control message (KMFmv) for the machine mass (KM). 24. Apparatus according to claim 23, characterized in that the apparatus is arranged to define the flow prediction (KMFPr) of the machine mass (KMFPr) on the basis of the measured mass flow (FT1) and the control message (KMFmv) of the machine mass (KM) and to control the dosage of the sub-masses (OM1). OM2, OM3) and / or the other raw material of the machine mass based on the flow prediction (KMFPr) of the machine mass (KM). 25. Device according to claim 24, characterized in that the device is defined to define the combined flow templates (OMFTr) of the sub-masses (OMFTr) on the basis of the sub-masses (OM1, OM2). 10 OM3) measured currents (FT3i.n), a setpoint trajectory (LT2Tr) for the surface level of the mixer / machine container (5), and the flow prediction (KMFPr) of the machine mass. 26. Device according to claim 25, characterized in that the device is defined to define the respective partial mass (OM1, OM2, OM3) consistency prediction (DTSP ^. N) on the basis of a consistency prediction (OMCsPr ^n) for the output of a partial mass container (3). the consistency of the measured sub-mass (OM1, OM2, OM3) (DT3i-n). 27. Device according to claim 26, characterized in that the device is defined to define the respective flow mass (OM1, OM2, OM3) flow template (OMFTri.n) on the basis of the respective sub-mass (OM1, OM2, OM3) consistency prediction (DT3Pri_n) and the sub-masses ( OM1, OM2, OM3) "total flow template (OMFTr). T ': 28. Device according to claim 27, characterized in that the device is arranged to control the dosing of the respective sub-mass (OM1, V.; OM2, OM3) from the sub-mass container (OM1, V. 3) so that the device is arranged to define a control message (OMFmv) for the flow of the sub-mass (OM1, OM2, OM3) on the basis of the flow (FT3) of the sub-mass (OM1, OM2, OM3) from the sub-mass container (3), setpoint (FIC3) for the sub-mass (OM1, OM2, OM3) flow control and the sub-mass (OM1, OM2, OM3) flow rate (OMFTr) and: control the dosage of the sub-mass (OM1, OM2, OM3) from the sub-mass: container (3) on the basis of said control message (OMFmv) f r part mass (OM1, OM2, OM3). 115 081 47 Device according to claim 28, characterized in that the device is arranged to define the flow prediction (FT3Pr) of the sub-mass (OM1, OM2, OM3) flowing from the sub-mass container (3) on the basis of the control message (OMFmv) for the sub-mass. (OM1, OM2, OM3) and sub-mass (OM1, OM2, OM3) measured flow (FT3). 30. Device according to claim 29, characterized in that the device is arranged to control the dosing of the sub-mass (OM1, OM2, OM3) from a massager (1) on the basis of the flow prediction (FT3Pr) of the sub-mass (0M1.0M2, OM3). Device according to claim 29 or 30, characterized in that the device is arranged to control the dilution of the sub-mass (OM1, OM2, OM3) flowing from the sub-mass container (3) with the dilution water so that the device is arranged to define a control message (DFmv) for dilution water flow based on consistency prediction (OMCsPr) for output of sub-mass container (3), setpoint trajectory (DT3Tr) for sub-mass (OM1, OM2, OM3) consistency (DT3), dilution water measured F (FT4) dilution water flow control and sub-mass (OM1, OM2, OM3) flow prediction (FT3Pr) and control dilution water flow based on the defined control message (DFmv) for dilution water. I f 32. Device according to claim 31, characterized in that the device is arranged to define the dilution water flow prediction (FT4Pr) on the basis of the dilution water control message (DFmv) and the dilution water measured flow (FT4). Device according to claim 32, characterized in that the device is arranged to control the dosage of the sub-mass (OM1, OM2, OM3) from the pulp compartment's massager (1) on the basis of the dilution water flow prediction (FT4Pr). 34. Device according to claim 33, characterized in that the device is arranged to control the dosage of the sub-mass (OM1, OM2, OM3) from the pulp tower (1) so that the device is arranged to define a control message (OMFmv) for the sub-mass (OM1, OM2) flowing from the pulp tower (1) to the sub-mass container (3) on the basis of the flow (F1 of the mass (OM1, OM2, OM3) of the pulp tower (1), a setpoint (FIC5) of the pulp (OM1) , OM2, OM3) flow control, a flow prediction (FT3Pr-FT4Pr) for the sub-mass 5 (OM1, OM2, OM3) leaving the sub-mass holder (3) and the setpoint controller (LT1Tr) for surface level in the sub-mass container (3) and control the dosing of the sub-mass (3). OM1, OM2, OM3) from the pulp tower (1) on the basis of the defined control message (OMFmv) of the sub-mass (OM1, OM2, OM3) flowing from the pulp tower (1) to the sub-mass container 10 (3). Device according to claim 34, characterized in that the device is arranged to define the flow prediction (FT5Pr) of the sub-mass (OM1, OM2, OM3) flowing from the mass tower (1) to the sub-mass container (3) on the basis of the control message (OMFmv) The flow rate of the mass tower (1) flowing sub-mass (OM1, OM2, OM3) and the flow measured from the mass flow rate (1) (OM1, OM2, OM3) (FT5). 36. Device according to claim 35, characterized in that! the arrangement is arranged to control the dilution of the partial mass (OM1, OM2, OM3) flowing from the mass (1) to the sub-mass container (3) with dilution water mixed in the mass (OM1, OM2, OM3) so that the device is arranged defining the control message (DFmv) for the dilution water flow on the basis of the consistency prediction (MTCsPr) of the mass flow (OM1, OM2, OM3), a setpoint trajectory (DT5Tr) for the consistency of the mass (1) flow sub-mass (OM1,,, OM2, OM3), dilution water measured flow (FT6), setpoint value (FIC6) for dilution water flow control, and flow prediction (FT5Pr) for mass flow (OM2, OM1, OM2, flow) ) and control the dilution water flow (FT6) on the basis of the defined dilution water control message (DFmv). 37. Apparatus according to any one of claims 21 to 36, characterized in that the device is adapted to define the consistency (DT1, DT3, DT5) of one or more of the mixing point (DP4, DP6) or from the mixing point. outgoing masses (KM, OM1, OM2, OM3) or the concentration of other machine materials in the mass (KM, OM1, OM2, OM3) by measurement or indirectly by using a process model describing the function of the pulp compartment or part thereof. 38. Device according to any one of claims 21 to 36, characterized in that the device is arranged to define the flow (FT1, FT3, FT5) of one or more masses entering the mixing point (DP4, DP6) or from the mixing point (KM, OM1, OM2). , OM3) by measurement or indirectly using a process model describing the function of the pulp compartment or part thereof. 39. Apparatus according to any one of claims 21 - 38, characterized in that the device is arranged to define a control message which comprises several future control steps for the machine mass (KM), a sub-mass (OM1, OM2, OM3) or the flow of the other frame material of the machine mass. a setpoint trajectory (KMFFTr, OMFTr) for the machine mass (KM), a partial mass (OM1, OM2, OM3) or the flow of the other mass of the machine mass, a setpoint trajectory (LT1Tr, LT2Tr) for surface level in the mixer / machine container (5) or the sub-mass container (3), and / or a control message comprising several future control steps for the dilution water flow (FT4, FT6) using a model predictive control method that includes a process model describing the pulp compartment or part thereof and optimization so that it with optimized, ; The cost associated with the ring is minimized. : 40. Device according to any of claims 21 - 39, characterized in that the process model is a dynamic process model. 41. A method for controlling the function of a pulp compartment in a papermaking machine, which pulp compartment is adapted to produce machine pulp 30 (KM), which is fed to the short circulation of the papermaker (8), by either a sub-pulp or several sub-pulp (OM1, OM2, OM3 ) by mixing them; with each other and in which the pulp compartment mixes the other frame material of the machine pulp to the pulp (KM, OM1, OM2, OM3) and / or the pulp (KM, OM1, OM2, OM3) is diluted by mixing dilution water to the pulp (KM, OM1, 115081 50 j OM2 , OM3), and in which method the flow (FT1, FT3, FT5) and consi; the stent (DT1, DT3, DT5) for the pulp (KM, OM1, OM2, OM3) flowing forward in the pulp compartment's dosing line and / or the concentration of the other raw material's concentration in the pulp (KM, OM1, OM2, OM3) is regulated, ) flow data (FT1) and a flow prediction (KMFPr) are defined, one or more sub-masses (OM1, OM2, OM3) flow data (FT3, FT5) and a flow prediction (FT3Pr, FT5Pr) are defined, a sub-mass (OM1, OM2, OM3) flow data (FT3, FT5) and flow prediction (FT3Pr, FT5Pr) are transmitted along the dosing line of the pulp compartment, baked so that the regulations governing the pulp flow forward along the dosing line utilize predicted future flow changes (DT3), DT5P (DT3), consistency data one or more sub-masses (OM1, OM2, OM3) and / or the concentration of other raw material in the mass (OM1, OM2, OM3) and a concentration prediction in the mass (OM1, OM2, O M3) is defined and the consistency data of a sub-mass (DT3, DT5) and consistency prediction (DT3Pr, DT5Pr) and / or the concentration of other raw material in the pulp (OM1, OM2, OM3) and a concentration prediction in the pulp (OM1, OM2, OM3) are forwarded. along the dosing line of the pulp compartment so that the controls governing the consistency of the pulp (KM, OM1, OM2, OM3) (DT1, DT3); DT5) or the concentration of other raw material in the pulp (KM, *> · OM1, OM2, OM3) utilizes predicted future consistency changes or changes in the concentration of the other raw material in the pulp (KM, OM1, OM2, OM3). 42. The method of claim 41, characterized in that the other raw material of the machine stock is a filler, an additive or a chemical.