CN102227532A - Procedure and system for control of refiner to improve energy efficiency and pulp quality - Google Patents

Abstract

A method is described for controlling a process section for thermo-mechanical pulp (TMP) refining. The process section has at least one first refiner having a plurality of sensors arranged in a predetermined position on a refiner plate of the at least one first refiner. The method comprises measuring, alternatively estimating, one or more process variables representing external states outside of the refiner Formula (I) for said process section and measuring, alternatively estimating, one or more values representing one or more internal states states Formula (II) inside said at least one first refiner, and calculating a change for said at least one manipulated variable (u 1 ) for said at least one refiner using said measurement of an internal state Formula (II) of said at least one refiner and a measurement of said one or more process external states Formula (I); for said process section by means of a mathematical process model.

Description

The control that is used for refiner is to improve the process and the system of energy efficiency and slurry quality

Technical field

The present invention relates to be used for controlling the improved method that hot mechanical slurry (TMP) finish grindes one or more refiners of procedure segment.The present invention can be applicable to use all technical fields of refiner, such as slurrying and paper industry and relevant industries.

Background technology

The refiner of one type or another type plays a key effect the high yield slurry production of slurrying and paper industry and relevant industries by begin to grind for example hot mechanical slurry (TMP) or chemi thermo mechanical slurry (CTMP) from lignocellulosic materials (such as wood chip).The refiner of mentioning two types herein is important: low denseness (LC) correct grinding, and wherein the slurry that is finish grinded is about 4 percent denseness (dried content); And high-consistency (HC) correct grinding, wherein denseness approximately is 40 percent usually.The LC correct grinding carries out in binary system (sheet/slurry and water), and the HC correct grinding has three-phase: sheet/slurry, water and steam.Other industry is used in (such as the manufacturing of wood-fiber board) and is also used refiner.

Most refiners comprise two plectanes, and pending material is passed to the periphery of plate betwixt internally.Usually, a rotation refiner plates that has a static refiner plates and rotate with very high speed.

Provided the more comprehensively schematic diagram of known refiner 1 among Fig. 4.The raw material that may comprise the slurry that wood chip 5 or prime are treated enter at the center C place of refiner.In first order refiner as shown in the figure, material transports via one or more screw feeders 7.Before entering actual refiner, usually raw material are mixed with dilution water 2, usually the mobile of this dilution water 2 measured and controlled.Alternatively, water directly can be added in the refiner.Then go in the way of periphery of refiner plates processed at material.Static refiner plates 3 or stator are usually by dynamo-electric ground or hydraulically push swivel plate 4 or rotor to.One or more dishes of rotation are driven by one or two motor 10.Milling zone (perhaps usually alleged correct grinding district) can also have the design of depending on plate, along the variable gap of radius.Accompanying drawing also shows the exit position 6 of gaging pressure Poutlet, and point that can measurement products inlet pressure Pinlet 8.

The diameter of refiner plates is according to the size (production capacity) of refiner and brand and different.At first, plate (being also referred to as part) is cast as one, but at present, it generally includes and is installed in stator or epitrochanterian a plurality of module together.These parts have the grinding pattern, and referring to Fig. 5, it has according to supplier and different bar 15,15 ' and groove 16.Bar serves as cutter, and it is with sheet defibrillation or the further slurry produced of correct grinding.In the HC refiner, fiber, water and steam also are transported in the groove between the bar.The amount of steam is space correlation, so water and steam can be present in the correct grinding district with sheet/slurry.In the HC refiner, water will be incorporated on the fiber usually.Different stream mode will take place in the design according to part in refiner.In the LC refiner, do not generate steam.

The refiner that also has other types is such as double plate (wherein two plates reciprocally rotate) or jordan mill.Another type is called two refiners, wherein has four refiner plates.The rotor that is positioned at the center has two refiner plates that are installed in its both sides, and has two static refiner plates then, for example uses hydraulic cylinder and it is pushed each other, produces two correct grinding districts thus.

When correct grinding wood chip or the previous slurry that has finish grinded, refiner plates is pushed usually each other to obtain the sheet separation of about 0.2-0.7mm, and this depends on the refiner that uses what type.

In traditional control concept of refiner control, controlled variable comprises that particular energy (promptly, ratio between refiner motor load and the slurry output), alternatively, only comprise the slurry denseness that motor load, refiner produce, and under the best circumstances, also comprise the slurry quality is described at least one variable (for example, Canadian Standard Freeness, CSF).In order to control these process variables, has manipulated variable usually, such as the output of hydraulic pressure, dilution water flow and wood chip or slurry.In addition, typical refiner production line comprises two refiners of series connection: main refiner (PR) and auxilliary refiner (SR).Usually, also there is the treatment step that is called the refusal correct grinding.

Therefore, the control of complete refiner production line becomes quite complicated usually.The example of the commercial control concept that gets can find in the academic dissertation [1] of Lid é n and patent application US2005/263259 (A1) [2].These control concepts are based on the Model Predictive Control (MPC) of using above-mentioned controlled variable, the large-scale complicated system that is used for comprising a plurality of refiner production lines or comprises single line or single refiner.

For example the alternative control variables of core is the sheet separation in [2], and it is then by operating hydraulically operated pressure P _HydrControl.At present, have the sheet separation sensor on the market, it is applied directly in the refiner plates.Usually, each correct grinding district only uses a gap sensor, is mainly used in and avoids plate to collide together, and reliably be not used in control gap inadequately because of it.

The system that also has other on the market is wherein along correct grinding region measurement temperature and/or pressure, to be used for displays temperature curve and/or pressure curve.Environment in refiner (for example, gap, output or dilution water) when changing, temperature change, and it is controlled thus, usually, use some temperature and/or pressure sensor directly to be placed in the plate, perhaps can be encapsulated in] along in the measurement band (being also referred to as sensor array) of the effective radius of refiner, referring to EP0788407[3.

At US6024309[4] in, a kind of control concept that is used to finish grind district's control has been described, wherein temperature curve is used for control procedure.Inquire into the similar later patents of same concept, for example US634381[5] also the serviceability temperature curve control refiner.

Verified, the design of refiner part is extremely important for the shape along the temperature curve of radius, and when being placed into temperature and/or pressure sensor in the sensor array, includes this point in to consider it is very crucial.

Except above-mentioned, there are not other measurement devices to be applied in the correct grinding district.Yet existence can be placed on the instrument in the pipeline of spurting of refiner, wherein can use with NIR (near-infrared) and measure the denseness that the algorithm that is coupled calculates slurry, for example at US 7,381,303[2] in hypothesis this be available.

Transfer Honeywell company, name is called the US 7 of " System and Method for Controlling a Thermo-Mechanical Wood Pulp Refiner ", 381, in 303, a kind of system has been described, wherein use independently controller to be respectively applied for fast dynamically (motor load and spurt the pipeline denseness) and slow motion attitude (slurry quality), being optimized cooperation thereon and controlling.Described stability controller and preferably regulated the refiner motor load and spurt the pipeline denseness, and quality controller is preferably controlled the slow motion attitude that is associated with the slurry quality variable.Also described by allowing motor load to operate the refiner production line,, automatically made maximum production at given slurry window with maximum.

Yet, be clear that, the inventor who controls the correct grinding process based on the measurement of the particular energy that motor load is represented does not provide the reliable control to the slurry mass parameter, because may produce different slurry quality under the situation of identical particular energy or motor load.

Summary of the invention

The objective of the invention is to solve above-mentioned one or more problem.In a first aspect of the present invention, this purpose and other purposes have been reached by method according to claim 1.

In a first aspect of the present invention, a kind of method that is used to control the procedure segment of hot mechanical slurry (TMP) correct grinding has been described, this procedure segment comprises at least one first refiner, it has a plurality of sensors in the precalculated position on the refiner plates that is arranged in described at least one first refiner, this method comprises: measure one or more process variables that (alternatively estimating) represents the external status outside the refiner of procedure segment, and one or more values of measuring the one or more internal states within described at least one first refiner of (alternatively estimating) expression, and the possibility of handling one or more variablees, wherein by means of the mathematical procedure model, the change at described at least one manipulated variable of described at least one refiner is calculated in the measurement of the described measurement of the internal state of described at least one refiner of use and described one or more process external status of described procedure segment.

According to an embodiment of the invention, a kind of method that is used to control the procedure segment of hot mechanical slurry correct grinding has been described, this procedure segment comprises at least one first refiner, it has a plurality of sensors in the precalculated position on the refiner plates that is arranged in described at least one first refiner, and this method comprises: measure the one or more process variables of (alternatively estimating) expression at the external status outside the refiner of procedure segment; And one or more values of measuring the one or more internal states within described at least one first refiner of (alternatively estimating) expression, and by means of the possibility of the one or more variablees of mathematical procedure model manipulation, and wherein use the mathematical procedure model to calculate change at described at least one manipulated variable of described at least one refiner, this mathematical procedure model is described by one group of nonlinear differential equation with vector value nonlinear function or difference equation.

According to another embodiment of the present invention, a kind of method that is used to control the procedure segment of hot mechanical slurry correct grinding has been described, this procedure segment comprises at least one first refiner, it has a plurality of sensors in the precalculated position on the refiner plates that is arranged in described at least one first refiner, this method comprises: measure the one or more process variables of (alternatively estimating) expression at the external status outside the refiner of procedure segment, and one or more values of measuring the one or more internal states within described at least one first refiner of (alternatively estimating) expression, and use the mathematical procedure model to handle the possibility of one or more variablees, and wherein this mathematical procedure model is described by one group of linear differential equation or difference equation.

According to another embodiment of the invention, a kind of method that is used to control the procedure segment of hot mechanical slurry correct grinding has been described, this procedure segment comprises at least one first refiner, it has a plurality of sensors in the precalculated position on the refiner plates that is arranged in described at least one first refiner, and this method comprises: measure the one or more process variables of (alternatively estimating) expression at the external status outside the refiner of procedure segment; And one or more values of measuring the one or more internal states within described at least one first refiner of (alternatively estimating) expression, and use the mathematical procedure model to handle the possibility of one or more variablees, and wherein this mathematical procedure model is described by Laplace transform and transfer function.

According to another embodiment of the invention, a kind of method that is used to control the procedure segment of hot mechanical slurry correct grinding has been described, this procedure segment comprises at least one first refiner, it has a plurality of sensors in the precalculated position on the refiner plates that is arranged in described at least one first refiner, and this method comprises: measure the one or more process variables of (alternatively estimating) expression at the external status outside the refiner of procedure segment; And one or more values of measuring the one or more internal states within described at least one first refiner of (alternatively estimating) expression, and use the mathematical procedure model to handle the possibility of one or more variablees, wherein said internal state is that the measurement of temperature comes computational process to change, and this temperature is used by the temperature survey array along the radius of the dish within described at least one refiner and calculated.

According to another embodiment of the invention, a kind of method that is used to control the procedure segment of hot mechanical slurry correct grinding has been described, this procedure segment comprises at least one first refiner, it has a plurality of sensors in the precalculated position on the refiner plates that is arranged in described at least one first refiner, and this method comprises: measure the one or more process variables of (alternatively estimating) expression at the external status outside the refiner of procedure segment; And one or more values of measuring the one or more internal states within described at least one first refiner of (alternatively estimating) expression, and use the mathematical procedure model to handle the possibility of one or more variablees, wherein computational process changes and changes at least one manipulated variable with the measurement that influence the slurry quality or the change in the estimation.

According to another embodiment of the invention, a kind of method that is used to control the procedure segment of hot mechanical slurry correct grinding has been described, this procedure segment comprises at least one first refiner, it has a plurality of sensors in the precalculated position on the refiner plates that is arranged in described at least one first refiner, and this method comprises: measure the one or more process variables of (alternatively estimating) expression at the external status outside the refiner of procedure segment; And one or more values of measuring the one or more internal states within described at least one first refiner of (alternatively estimating) expression, and use the mathematical procedure model to handle the possibility of one or more variablees, wherein use the mathematical procedure model to minimize the function of internal state and/or external status or the deviation between measured value and the reference value.

According to another embodiment of the invention, a kind of method that is used to control the procedure segment of hot mechanical slurry correct grinding has been described, this procedure segment comprises at least one first refiner, it has a plurality of sensors in the precalculated position on the refiner plates that is arranged in described at least one first refiner, and this method comprises: measure the one or more process variables of (alternatively estimating) expression at the external status outside the refiner of procedure segment; And one or more values of measuring the one or more internal states within described at least one first refiner of (alternatively estimating) expression, and use the mathematical procedure model to handle the possibility of one or more variablees, wherein use the mathematical procedure model to minimize the estimated value of internal state and/or external status and the deviation between the reference value.

According to another embodiment of the invention, a kind of method that is used to control the procedure segment of hot mechanical slurry correct grinding has been described, this procedure segment comprises at least one first refiner, it has a plurality of sensors in the precalculated position on the refiner plates that is arranged in described at least one first refiner, and this method comprises: measure the one or more process variables of (alternatively estimating) expression at the external status outside the refiner of procedure segment; And one or more values of measuring the one or more internal states within described at least one first refiner of (alternatively estimating) expression, and use the mathematical procedure model to handle the possibility of one or more variablees, wherein will be fed to from the output of described at least one first refiner in second refiner so that described procedure segment comprises the two-stage refiner.

According to another embodiment of the invention, a kind of method that is used to control the procedure segment of hot mechanical slurry correct grinding has been described, this procedure segment comprises at least one first refiner, it has a plurality of sensors in the precalculated position on the refiner plates that is arranged in described at least one first refiner, this method comprises: measure the one or more process variables of (alternatively estimating) expression at the external status outside the refiner of procedure segment, and one or more values of measuring the one or more internal states within described at least one first refiner of (alternatively estimating) expression, and use the mathematical procedure model to handle the possibility of one or more variablees, wherein by means of Mathematical Modeling, use second refiner internal state described measurement and calculate process change at the measurement of one or more external status of described procedure segment at least one manipulated variable of second refiner.

According to another embodiment of the invention, a kind of method that is used to control the procedure segment of hot mechanical slurry correct grinding has been described, this procedure segment comprises at least one first refiner, it has a plurality of sensors in the precalculated position on the refiner plates that is arranged in described at least one first refiner, this method comprises: measure the one or more process variables of (alternatively estimating) expression at the external status outside the refiner of procedure segment, and one or more values of measuring the one or more internal states within described at least one first refiner of (alternatively estimating) expression, and use the mathematical procedure model to handle the possibility of one or more variablees, wherein use at described at least one measurement of the internal state of each refiner with at the measurement of the external status of each refiner and the mass measurement at least after second refiner and calculate process change at least one manipulated variable of the procedure segment that comprises two or more refiners.

According to another embodiment of the invention, a kind of method that is used to control the procedure segment of hot mechanical slurry correct grinding has been described, this procedure segment comprises at least one first refiner, it has a plurality of sensors in the precalculated position on the refiner plates that is arranged in described at least one first refiner, this method comprises: measure the one or more process variables of (alternatively estimating) expression at the external status outside the refiner of procedure segment, and one or more values of measuring the one or more internal states within described at least one first refiner of (alternatively estimating) expression, and use the mathematical procedure model to handle the possibility of one or more variablees, wherein use at the described measurement of the internal state of each refiner with at the mass measurement of the measurement of the external status of each refiner and second refiner and calculate process change, so that optimize energy input to described procedure segment at least one manipulated variable of the procedure segment that comprises two or more refiners.

According to another embodiment of the invention, a kind of method that is used to control the procedure segment of hot mechanical slurry correct grinding has been described, this procedure segment comprises at least one first refiner, it has a plurality of sensors in the precalculated position on the refiner plates that is arranged in described at least one first refiner, this method comprises: measure the one or more process variables of (alternatively estimating) expression at the external status outside the refiner of procedure segment, and one or more values of measuring the one or more internal states within described at least one first refiner of (alternatively estimating) expression, and use the mathematical procedure model to handle the possibility of one or more variablees, wherein using wherein said internal state is pressure (P ₁) measurement come computational process to change, this pressure uses along the measurement array of the radius of the dish within described at least one refiner and calculates.

In another aspect of this invention, a kind of system that comprises the procedure segment that is used for hot mechanical slurry (TMP) correct grinding has been described, this procedure segment comprises at least one first refiner, it has a plurality of sensors in the precalculated position on the refiner plates that is arranged in described at least one first refiner, method comprises that surveyingpin is to one or more process variables of described procedure segment and measure one or more internal states in described at least one first refiner, wherein this system also comprises and being used for by means of Mathematical Modeling, use the measurement of internal state of described at least one refiner or estimation and come application process to change with monitoring and control the device of described at least one first refiner at the measurement of described one or more process variables of described procedure segment, this process change calculates according at least one manipulated variable at described at least one refiner.

According to another embodiment of the present invention, a kind of system that comprises the procedure segment that is used for hot mechanical slurry correct grinding has been described, this procedure segment comprises at least one first refiner, it has a plurality of sensors in the precalculated position on the refiner plates that is arranged in described at least one first refiner, method comprises that surveyingpin is to one or more process variables of described procedure segment and measure one or more internal states in described at least one first refiner, wherein this system also comprises and being used for by means of Mathematical Modeling, use the described measurement of internal state of described at least one refiner or estimation and come application process to change to control the device of described at least one first refiner at the measurement of described one or more process variables of described procedure segment, this process change calculates according at least one manipulated variable at described at least one refiner, and one or more in wherein said a plurality of sensors are arranged on the effective radius of making beating dish of the refiner in the described procedure segment.

According to another embodiment of the invention, a kind of system that comprises the procedure segment that is used for hot mechanical slurry correct grinding has been described, this procedure segment comprises at least one first refiner, it has a plurality of sensors in the precalculated position on the refiner plates that is arranged in described at least one first refiner, method comprises that surveyingpin is to one or more process variables of described procedure segment and measure one or more internal states in described at least one first refiner, wherein this system also comprises and being used for by means of Mathematical Modeling, use the described measurement of internal state of described at least one refiner or estimation and come application process to change to control the device of described at least one first refiner at the measurement of described one or more process variables of described procedure segment, this process change calculates according at least one manipulated variable at described at least one refiner, and wherein said procedure segment comprises two or the more a plurality of refiner that series connection (alternatively in parallel) is arranged.

According to another embodiment of the invention, a kind of system that comprises the procedure segment that is used for hot mechanical slurry correct grinding has been described, this procedure segment comprises at least one first refiner, it has a plurality of sensors in the precalculated position on the refiner plates that is arranged in described at least one first refiner, method comprises that surveyingpin is to one or more process variables of described procedure segment and measure one or more internal states in described at least one first refiner, wherein this system also comprises and being used for by means of Mathematical Modeling, use the described measurement of internal state of described at least one refiner or estimation and come application process to change to control the device of described at least one first refiner at the measurement of described one or more process variables of described procedure segment, this process change calculates according at least one manipulated variable at described at least one refiner, and wherein this system also comprises the one or more control modules that are arranged as the Control and Optimization device.

According to another embodiment of the invention, a kind of system that comprises the procedure segment that is used for hot mechanical slurry correct grinding has been described, this procedure segment comprises at least one first refiner, it has a plurality of sensors in the precalculated position on the refiner plates that is arranged in described at least one first refiner, method comprises that surveyingpin is to one or more process variables of described procedure segment and measure one or more internal states in described at least one first refiner, wherein this system also comprises and being used for by means of Mathematical Modeling, use the described measurement of internal state of described at least one refiner or estimation and come application process to change to control the device of described at least one first refiner at the measurement of described one or more process variables of described procedure segment, this process change calculates according at least one manipulated variable at described at least one refiner, and wherein this system also comprises the one or more control modules that are arranged as state estimator.

According to another embodiment of the invention, a kind of system that comprises the procedure segment that is used for hot mechanical slurry correct grinding has been described, this procedure segment comprises at least one first refiner, it has a plurality of sensors in the precalculated position on the refiner plates that is arranged in described at least one first refiner, method comprises that surveyingpin is to one or more process variables of described procedure segment and measure one or more internal states in described at least one first refiner, wherein this system also comprises and being used for by means of Mathematical Modeling, use the described measurement of internal state of described at least one refiner or estimation and come application process to change to control the device of described at least one first refiner at the measurement of described one or more process variables of described procedure segment, this process change calculates according at least one manipulated variable at described at least one refiner, wherein this system also comprises memory storage device, and wherein storage is used to carry out the one or more computer programs according to the method for claim 1.

The purpose of all refiner control systems is to guarantee the slurry quality under the situation that the particular energy of refiner is imported.Yet problem is that the existing control system on the market is slower, and this causes being difficult to least energy input demand is guaranteed specific slurry quality.

Traditionally; the Process Control System that is used for refiner does not have the information from true correct grinding process, that is, and and the process that takes place in the correct grinding district; and process prescription is usually based on wanting controlled output, such as particular energy E or motor load M and may also comprise the measurement denseness C that spurts in the pipeline.These outputs usually by Change Example such as sheet separation (by the hydraulic pressure P that is applied _Hydr(it produces power onboard) or for example control based on the power of electromechanics on the plate) and the dilution water flow F that goes to refiner _DHandle, be described below:

$Y=\left[\begin{array}{c}E\\ C\end{array}\right]=\mathrm{GU}=\left[\begin{array}{cc}{g}_{11}& g_{12}\\ g_{21}& g_{22}\end{array}\right]\left[\begin{array}{c}{P}_{\mathrm{hydr}}\\ F_D\end{array}\right]$

Wherein Y represents vector to be controlled, and G is transfer function matrix, and it has described element g _IjProcess dynamic.Vector U describes the input vector with the variable that can handle.

Traditional control system is (such as the US 7 that describes based on the system of above type, 381,303/263259[2]) shortcoming be: particular energy or motor load are subjected to the influence of a plurality of process variables except above-mentioned two process variables, and this makes and to be difficult to specify in advance the optimum action pane that is used to move refiner.

Another problem of this structure is: particular energy or motor load are with always relevant with the integration of the power distribution of distinguishing radius along correct grinding, and it can not provide any information that consumes about dimensional energy.List is clear that particular energy or motor load provide the limited information that how to influence final slurry quality about local process condition from this on the one hand, and this is necessary for obtaining good control performance.

Mentioned herein to problem outside the accessory problem that exists be traditional control system for example do not handle by plate wearing and tearing, fiber mat distribution fluctuates, different operating point or the like cause non-linear naturally, this also can reduce control performance.

Therefore, the controllability in aforesaid traditional control concept may be improved in slurry quality angle, because may produce different quality under identical particular energy or motor load.

Solution

In the present invention, Internal stateζ promptly, directly plays a key effect aspect the improvement strategy that how to find process control describing from the information of correct grinding district (estimate or measure).In order to distinguish internal state and other states, introduced External statusη is as the state of the acquisition of the measurement device outside refiner or the state of estimating from Mathematical Modeling.These states may be used for sampling relatively quickly usually, but compare with internal state, still are in slower sampling rate.Other External statusThe slurry quality that the Q ordinary representation is measured, it only can be sampled with slow a lot of sampling rate, and it also is very important following these other external status.All states that can control are the elements among the state vector x, and state vector x promptly

$x=\left[\begin{array}{c}\mathrm{\ζ}\\ \mathrm{\η}\\ Q\end{array}\right]$

And utilize this term, can utilize new process optimization method to describe clear difference between traditional control concept and the present invention.Note, each component of state vector x can then become vector.

Input vector u _iWith state vector x _iBetween relation can be by one group by vector value nonlinear function f _iThe nonlinear differential equation that characterizes is described,

${\stackrel{\·}{x}}_i\left(t\right)=f_i(x_i\left(t\right),u_i\left(t\right))$

Wherein, the i refiner of indicating to describe.

Usually, input vector can change size according to the type of the refiner of being studied, but may be usually represented by sheet or slurry product flow, dilution water flow and sheet separation (perhaps influencing the device such as the sheet separation of hydraulic pressure or alternative electro-mechanical force).At some refiner, also may handle the inlet pressure in the slurry feeder system.

In order more specifically to describe, that will use among the present invention is typical Internal stateFor example can be described as finish grinding temperature, the pressure in the correct grinding district or the power measurement in the district or pass through to use different software solvers according to physics or the estimated state of empirical model.Its example is the predictive power along the radius in the correct grinding district, the estimation denseness in this district, the average fiber time of staying in this district in the zones of different, sheet separation, from the slurry quality in correct grinding district etc.When the estimation of slurry quality was compared with the slurry quality of measuring according to the downstream analysis device, it can be valuable that the slurry quality is estimated.Therefore, variable can refer to describe the one group of soft sensor estimation of model (perhaps according to) of the hiding process variables in the correct grinding district.In this model, for example temperature survey can be used to obtain the suitable estimation of energy balance, and it provides indirectly with district's particular data and is difficult to the directly information of measurement usually, is similar to the time of staying, fiber separation/Fibrillation work or the like.Variable can also refer to the estimation that obtains from algorithm, and this algorithm usage space correct grinding region measurement is to find some optimum condition, to be similar to the position of the maximum temperature that is used for finish grinding the district, and it can for example be subjected to for example Sikter[6] P that describes _InletControl.

Typically External statusExample (its may be outside correct grinding district very fast relatively but measure slowly) than internal state will be to spurt pipeline denseness, pressure, motor load etc.This type of external status can also be estimated by Mathematical Modeling.The external status of other types (only may slowly how to sample) is placed among the vectorial Q.Basically, this type of state is slurry quality variable CSF, average fiber length and the lumps etc. in the measured downstream of refiner.If the slurry quality variable is estimated (for example, using the ARMAX model) to use the input of doing FEEDBACK CONTROL according to the conventional system identification procedure, then along with sampling rate will become enough fast, the variable of this type of estimation can be placed among the vectorial η.

Notice that the external status that is similar to motor load or is used to obtain the combination of particular energy (load/output) is not considered as being different from the part of the notion that the present invention of traditional control concept describes.Optimizing the motor load measured in the routine can be with the constraint of opposing and optimizing.

In addition, it should be noted that words if necessary can be punctured into less vector with vectorial u, if and/or for example can accurately measure the sheet separation (because can replacement liquid pressure pressure P _Hydr), then it can be expanded the size of its inevitable influence matrix.In matrix i, that is, the number i={1 of included refiner, 2} is not appointment, and a plurality of possible combinations are provided, and the selection of each structure will be that refiner is specific.

By distinguishing internal state and external status, can handle in the correct grinding district fast dynamically, and comparing with traditional control concept can be controlled quickly, and can handle such as the thermometric internal state in correct grinding district and give that optimizing process distributes preferably why and the slurry quality estimates it why is the reason of local non-linear (that is, particular energy (perhaps motor load) do not catch spatial correlation information).This type of nonlinear example is before the temperature maximum of finish grinding in distinguishing and the various process condition that is faced afterwards.The time of staying that early stage work shows the paste materials in these two parts in the correct grinding district will be depended on the complex phenomena set.In other words, provide the fiber separation/Fibrillated information that how in refiner, to realize indirectly, because it is with relevant from the difficulty of correct grinding district exhaust steam such as thermometric internal state.

Therefore, from the angle of mathematics, the master variable that (that is not being based on motor load or particular energy control from traditional concept) acquisition will be controlled from the correct grinding district.In fact, compare with traditional concept, soft sensor and the measurement of distinguishing from correct grinding provide the information that can use immediately.Certainly,, can use and spurt the denseness of measuring in the pipeline if available, but usage space denseness preferably, and it can get from model.

If control comprises the refiner production line of two refiners, then can be by making up the model that individual refiner model is configured to whole line.For example, ignore the melange effect that spurts pipeline, and only consider time delay D ₁(it is usually in the magnitude of 5-10s) can obtain

${\stackrel{\·}{x}}_2\left(t\right)=f_2(x_1(t-D_1),x_2\left(t\right),u_2\left(t\right))$

Certainly, actual measurement to meeting change along with the difference of installing.

Usually, in this application, expect that these measurements only are the subclass of process status, and more usually, the model formation of describing the relation between measurement and the state can comprise nonlinear function, promptly

y(t)＝h(x(t)，u(t))

In each iteration of control, that is, at any time collect new the measurement, all need to solve two optimization problems; A problem is the estimated state vector x, and one is to optimize control variables u in the future.Then, use the rollback control method, send the control variables in first moment to process, and when next measures constantly, repeat to optimize.

The invention describes a kind of mode, except other, it directly uses temperature and/or pressure measxurement in the correct grinding district, with the process condition in control and the optimization refiner, so that improve energy efficiency and slurry quality.This process means that the internal state of being represented by temperature and/or pressure measxurement is mainly used in the change that minimizes in slurry quality or the energy consumption.Owing to the availability of the internal state that uses in the reponse system, can the number of interactive elements be minimized.

The present invention proposes solution to described problem, and relate to and be used in combination robust temperature and/or pressure measxurement and, so that to control the slurry quality and the energy of refiner is imported the two than faster speed at present from the available measuring-signal and the Mathematical Modeling of process.

Basic advantage of the present invention is that owing to the internal state of directly measuring such as temperature and/or pressure, the control response faster that can produce variable is compared with traditional refiner control concept, and is relevant with final slurry quality better in the correct grinding district.The present invention also by introducing relate to refiner internal state based on Model Optimization, significant improvement compared with prior art is provided.In one aspect of the invention, this method:

A) comprise temperature (and the possible power) measurement of finish grinding in the district, but may not comprise motor load.More importantly,

B) it is handled whole two-stage refiner production line as (many speed) optimal control problem, hereinafter describes in detail.

In another aspect of this invention, a kind of computer program and be recorded in computer program on the computer-readable medium is disclosed.

Description of drawings

With reference to following detailed description, can understand method and system of the present invention more all sidedly in conjunction with the drawings, in the accompanying drawings:

Fig. 1 shows the schematic block diagram according to the method and system that is used to control the TMP slurry correct grinding process that comprises first refiner of one embodiment of the present invention;

Fig. 2 shows the invention according to Fig. 1 according to one embodiment of the present invention, and wherein diagrammatic sketch also shows the process that comprises two refiners;

Fig. 3 shows according to the invention of Fig. 1 or Fig. 2 and especially for the schematic flow diagram of realization according to the step of the method for one embodiment of the present invention.

Prior art

Fig. 4 shows the schematic diagram of known main refiner, and Fig. 5 shows the known refiner abrasive sheet that is furnished with temperature or pressure sensor, and Fig. 6 shows known temperature sensor (perhaps pressure sensor) array that is arranged on the refiner plates.

The specific embodiment

Fig. 1 shows the schematic diagram of the method for control TMP slurry refiner.This diagrammatic sketch shows the process with single refiner 33 and first control module 32.Import one or more set-points 30 to first control module or Control and Optimization device 32 or similar devices with identical function.First control module, promptly the Control and Optimization device is arranged to be used to handle the external procedure variable of conduct to the input of process 33, such as the hydraulic pressure P that refiner plates is pressed together _Hydr, be designated as F _pWood chip 5 _FlowFlow and be designated as F _DDilution water 2 '.Produce the slurry of correct grinding from process 33.To second control module is state estimator 39 input external variables 37, and these external variable 37 expressions are from the slurry denseness 37 of process and from the quality Q of sampling unit 35.Present intrinsic value 36 to state estimator 39,36 expressions of this intrinsic value use that the sensor shown among Fig. 6 21 obtains from temperature curve within the refiner or pressure curve.The state estimator computing mode is estimated And with its transmission 40 to first control modules, promptly the Control and Optimization device 32.In the Control and Optimization device, estimated state be used as be used for based on process model calculate all state variables future trend starting point.Then compared with model output in the set-point, to obtain departure.Utilization minimizes this departure as changing in the future of the manipulated variable of the free variable in optimizing.

At main refiner, will handle input variable and be summarised in following vectorial u ₁In:

$u_1=\left[\begin{array}{c}{F}_P\\ F_D\\ P_{\mathrm{hydr}}\end{array}\right]$

F wherein _pExpression flake products flow, F _DExpression dilution water flow, and P _HydrExpression is applied to the hydraulic pressure on the refiner plates.Note, also have other potential methods that are used to handle the power that plate is pressed together, such as using electromechanical equipment.When measuring the sheet separation, the control structure of cascade also is a kind of alternative, wherein the manipulated variable in the control that the set-point of sheet separation is considered as describing among the present invention.Yet the result is P _HydrTo be used as and be used to describe the variable that all these type of sheet separations change.At the refiner of some type, inlet pressure P _InletAlso can be used as manipulated variable.

Similarly, corresponding process status variable is at x ₁In provide:

$x_1=\left[\begin{array}{c}{\mathrm{\ξ}}_1\\ T_1\\ C_1\\ Q_1\end{array}\right]$

ξ wherein ₁Be the power of within refiner, measuring (the perhaps soft sensor of power), T ₁Be temperature survey array along the radius within the refiner, C ₁Be to spurt the pipeline denseness, and Q ₁It is the vector of slurry quality variable (such as Canadian Standard Freeness CSF and average fiber length MFL).ξ ₁Perhaps T ₁Alternative use refiner within pressure P ₁As state variable.

u ₁With x ₁Between relation can be by one group by vector value nonlinear function f ₁The nonlinear differential equation that characterizes is described:

${\stackrel{\·}{x}}_1\left(t\right)=f_1(x_1\left(t\right),u_1\left(t\right))$

The active attitude of refiner is to activate and sensing (hereinafter more about sensing).By u _1cExpression comes the output of self-controller, following linear differential equation approximate description to the input in correct grinding district:

$\mathrm{\τ}{\stackrel{\·}{u}}_1=-u_1+u_{1c}$

Timeconstant is equal roughly for all inputs, and usually at the 1-5 order of magnitude of second.

Alternatively, this relation can be described as by Laplace transform and transfer function:

$U_1=\frac{1}{\mathrm{\τs}+1}{U}_{1c}$

Fig. 2 shows the schematic block diagram of control TMP slurry refiner process line method.This diagrammatic sketch shows the process with first refiner 33 and second refiner 34, and first refiner 33 and second refiner 34 preferably are arranged as main refiner and auxilliary refiner.Provide at first control module or have one or more set-points 30 of the similar devices of identical function to first control module or Control and Optimization device 32.First control module is that the Control and Optimization device is arranged to the external procedure variable of manipulation conduct to the input of first refiner 33, such as the hydraulic pressure P that refiner plates is pressed together _Hydr, wood chip 5 _FlowFlow and dilution water 2 '; And handle the hydraulic pressure P of conduct to the input of auxilliary refiner _HydrWith dilution water 2 '.Slurry from first refiner is directed to second refiner 34 by spurting the pipeline (not shown).Produce the slurry P of correct grinding from auxilliary refiner 34.Slurry to correct grinding is sampled, to measure one or more mass parameter Q.To second control module is state estimator 39 input external variables 37, and its expression comes the slurry denseness (C) of autonomous refiner and from the quality 38 (Q) of sampling unit 35.Present intrinsic value to state estimator 39, this intrinsic value represents to use that the sensor shown among Fig. 6 21 obtains from (master) refiner 36 at T1 place and (assisting) refiner 36 at T2 place " within temperature curve or pressure curve.The state estimator computing mode is estimated

And sending it to first control module is Control and Optimization device 32.In the Control and Optimization device, estimated state be used as based on process model calculate all state variables future trend starting point.Then compared with model output in the set-point, to obtain departure.Utilization minimizes this departure as changing in the future of the manipulated variable of the free variable in optimizing.

Usually, two refiners are arranged during the course together, as above for example in conjunction with as described in Fig. 2.For auxilliary refiner, manipulated variable is:

${\mathrm{<figure-callout\; id="2"\; label="u"\; filenames="HPA00001378434900041.png"\; state="\{\{state\}\}">u</figure-callout>}}_2=\left[\begin{array}{c}{F}_D\\ P_{\mathrm{hydr}}\end{array}\right]$

It exports dynamical correlation with controller once more:

$\mathrm{\&tau;}{\stackrel{\&CenterDot;}{u}}_2=-{\mathrm{<figure-callout\; id="2"\; label="u"\; filenames="HPA00001378434900041.png"\; state="\{\{state\}\}">u</figure-callout>}}_2+u_{2c}$

The canonical process state variable that is used for auxilliary refiner is:

$x_2=\left[\begin{array}{c}{\mathrm{\&xi;}}_2\\ T_2\\ C_2\\ {\mathrm{<figure-callout\; id="2"\; label="Q"\; filenames="HPA00001378434900041.png"\; state="\{\{state\}\}">Q</figure-callout>}}_2\end{array}\right]$

Equally, the alternative state variable is the pressure P within the refiner ₂

If the pipeline that spurts between main refiner and the auxilliary refiner is considered as static:

${\stackrel{\&CenterDot;}{x}}_2\left(t\right)=f_2(x_1(t-D_1),x_2\left(t\right),u_2\left(t\right))$

Yet,, spurt pipeline itself and introduced time delay D as indicated in the formula ₁, common magnitude at 5-10s.

Typical measuring assembly can be:

$y=\left[\begin{array}{c}{T}_1\\ T_2\\ C_1\\ {\mathrm{<figure-callout\; id="2"\; label="Q"\; filenames="HPA00001378434900041.png"\; state="\{\{state\}\}">Q</figure-callout>}}_2\end{array}\right]$

T wherein ₁And T ₂Be respectively the temperature survey (may be vector value) in main refiner and the auxilliary refiner, C ₁Be measured main refiner output spurt the pipeline denseness, and Q ₂It is auxilliary refiner slurry quality afterwards.

Herein, except final slurry quality Q ₂Outside, all signals can be measured once by per second, final slurry quality Q ₂Use sampling analysis device equipment to measure, each sampling needs 5 minutes usually.In addition, identical equipment can be served some measurement points, wherein in fact normally 20-30 minute sampling interval.Usually have latency chest before measuring, it serves as then and is similar to anti alias filter.

Total model becomes one group of non-linear differential and algebraic equation (DAE), and it in many speed sample mode is:

$\stackrel{\&CenterDot;}{x}\left(t\right)=f(x\left(t\right),u\left(t\right))$

y(t)＝h(x(t)，u(t))

Wherein

$u\left(t\right)=\left[\begin{array}{c}{u}_{1c}\\ u_{2c}\end{array}\right]$

And state variable x (t) is by x ₁(t) and x ₂(t) and possible additivity make up, dynamic with explanation actuator and sensor.

In each iteration of control, that is, when whenever collecting new measurements, need to solve two optimization problems: a problem is the estimated state vector x, and one is to optimize the control variables in future.Then use the rollback control method, send the control variables in first moment to process, and when next measures constantly, repeat to optimize.

At state estimation, optimization aim is that estimated service life can be used all states that measure, refiner best.This can use Kalman filter [7] (if perhaps model is non-linear, then using extended Kalman filter) to carry out, and has wherein disposed the stochastic modeling of process and measurement noise.Alternatively, use so-called rolling time domain and estimate [8].Then slack variable w in the discrete version that uses a model and v introduce process and measure noise:

x _k+1＝g(x _k，u _k)+w _k

y _k＝h(x _k，u _k)+v _k

Wherein, integer k is represented k signal value, and it is at moment t=kT _sShi Keyong, wherein T _sBe the sampling interval, that is, and x for example _k=x (kT _s).

Then, rolling time domain is estimated corresponding to minimizing:

$\min {(x_{k-M}-{\hat{x}}_{k-M})}^T{P}^{-1}(x_{k-M}-{\hat{x}}_{k-M})+\underset{n=k-M}{\overset{k}{\mathrm{\&Sigma;}}}{w}_n^T{R}_1^{-1}{w}_n+v_n^T{R}_2^{-1}{v}_n$

For example be limited by:

x _min≤x(k)≤x _max

Herein, P, R ₁And R ₂Be the tuning weight matrix that is used for estimator, its have with Kalman filtering in estimation and noise covariance matrix similarly explain and importance.

As indicated, if t is current Measuring Time, then should optimize usually at time domain [t-MT _s, t] on carry out.Because should the time interval in the past, so the applied manipulated variable u of hypothesis visit _kHistory value.First penalty term of this standard is to create the contact of optimizing window to next one optimization window from one, wherein

Expression is from the estimation at this particular moment of the optimization that operates in the previous cycle.But making this problem become non-type is not to be y _kAll elements all available in all sampling instants, this has produced many speed state estimation problem.State estimation produces the starting point of the optimization that is used for manipulated variable in the future, wherein set-point r in future _kWith state variable m (x by using the mathematical procedure model to calculate _k) some subclass or combination compare.The equation of optimization aim for example can be:

$\min \underset{k=0}{\overset{N_y}{\mathrm{\&Sigma;}}}{(r_k-m\left(x_k\right))}^T{W}_y(r_k-m\left(x_k\right))-+\underset{k=0}{\overset{N_u}{\mathrm{\&Sigma;}}}{\mathrm{\&Delta;u}}_k^T{W}_u{\mathrm{\&Delta;u}}_k$

For example be limited by:

x _min≤x _k≤x _max

u _min≤u _k≤u _max

Δu _min≤Δu _k≤Δu _max

Use Δ u herein, _k=u _k-u _K-1Be optimized as free variable, it has introduced the integral action in the controller.

In traditional refiner control concept, the typical candidate's variable with set-point is main refiner slurry denseness C ₁With the slurry quality Q after the auxilliary refiner ₂, but above equation should be limited to this selection.

Noting, because the number of manipulated variable is usually greater than 2, and is 6, so should have about the set-point more than two variablees sometimes.For example, a kind of possibility is the set-point that has at power within the refiner and/or peak temperature.The radial position of peak temperature is another candidate of set-point.

In above-described optimization problem, use nonlinear model as equality constraint, caused the Nonlinear Model Predictive Control problem.

Alternatively, make the model linearisation, produce the model of following form:

x _k+1＝Ax _k+Bu _k

y _k＝Cu _k

Notice that because many speed character of measuring, the dimension of Matrix C will change in time.If use this class model as the equality constraint in optimizing, then solved (many speed) linear model PREDICTIVE CONTROL problem on the contrary thus.

Fig. 3 shows the simplified flow chart of one or more methods according to a further aspect of the invention.The method of the figure shows begins (50) in initialization time t.Each cycle starts from obtaining from sensor 52 value of measurement.Then the value of these measurements (and may comprise also that length is the history value in the window of M) is used with process model, to calculate (53) state estimation

Then the starting point in this state estimation being optimized as forward direction, it is N in length _uFuture on the time domain, manipulated variable is produced a series of changes 55.Use rollback time domain principle, only send the change first time of manipulated variable to actuator 57; After this, the time increases (58), and repetitive process (52-57).

Above and the method for the condition monitoring described of other parts of specification can realize by computer application, computer application comprises computer program elements or software code, it is in being loaded into processor or computer the time, makes computer or processor manner of execution step.This method can be described as comprising:

Above and the control described of other parts of specification and the method for optimization can realize by computer application, computer application comprises computer program elements or software code, it is in being loaded into processor or computer the time, makes computer or processor manner of execution step.The function of method (all methods as shown in Figure 3) can realize by handling digital function, algorithm and/or computer program, and/or by simulated assembly or analog circuit, perhaps realizes by the two the combination of numeral and analog functuion.

As mentioned above, method of the present invention can realize that this computer program comprises computer program code or the software section that moves by means of one or more computer programs on computer or processor.Microprocessor (perhaps processor) comprises central processing unit CPU, and it carries out the step according to the method for one or more aspects of the present invention.This is carrying out down such as being stored in to small part in the memory and/or by the auxiliary of the addressable one or more described computer programs of one or more processors.Each processor can be in control module, perhaps can be used as independently Control and Optimization device unit, perhaps in state estimator unit or its part, perhaps also can in this locality in this locality or the distributed computer chemical control system system or central control system, move.Be appreciated that described computer program can also move on one or more universal industrial microprocessors or computer rather than one or more adaptive especially computer or processor.

Computer program comprises computer program code elements or software code part, and it makes computer use the value of previously described equation, algorithm, data, storage and calculates manner of execution.The part of program can be stored in the processor, as mentioned above, but also can be stored in ROM, RAM, PROM, EPROM or eeprom chip or the similar storage arrangement.Program can also be partly or integrally is stored on other suitable computer-readable mediums, such as disk, CD-ROM or DVD dish, hard disk, magneto-optic memory storage device, volatile memory, flash memory, as firmware stores on data server or one or more data server array.Also can use other known and suitable media, comprise removable memory medium and other removable flash memories, hard disk drive etc.Described computer program can also partly be arranged in the Distributed Application, and it can almost side by side move on some different computers or computer system.Can make program and can be used for obtaining, sending, perhaps under the situation of program, be used on the internet and carry out such as original position or with the data of the relevant information of sign.Can be by means of following any data that visit: OPC, opc server, Object Request Broker (such as COM, DCOM or CORBA), web service.

Should be noted that and above described illustrative embodiments of the present invention, can make some changes and modification, and do not break away from the scope of the present invention that appended claims limits disclosed solution.

List of references

[1]J.Lidén，Quality?Control?of?Single?Stage?Double?Disc?Chip?Refining，Licentiate?Thesis，Mid?Sweden?University，2003.

[2] M.S.Sidhu, R.J.van Fleet and M.R.Dion, System and Method for Controlling a Thermo-Mechanical Wood Pulp Refiner, U.S. Pat 7,381,303,2008.

[3] A.

And P.Engstrand, System for continuously measuring pressure and temperature in the beating zone of refiners. European patent application EP 0 788 407 was authorized on February 10th, 1999.

[4] A. A method for guiding the beating in a refiner and arrangement for performing the method, U.S. Pat 6,024,309,2000.

[5] O.M.Johansson, Refiner measurement system and method. U.S. Pat 6,314,381 was authorized November 6 calendar year 2001.

[6]D.Sikter，Quality?Control?of?Newsprint?TMP?Refining?Process?based?on?Refining?Zone?Temperature?Measurements，Licentiate?Thesis，Chalmers?University?of?Technology，2007.

[7]B.D.O?Anderson?and?J.B.Moore，Optimal?Filtering.Prentice-Hall，1979.

[8].C.V.Rao，Moving?Horizon?Strategies?for?the?Constrained?Monitoring?and?Control?of?Nonlinear?Discrete-Time?Systems，Ph.D.Thesis，University?of?Wisconsin，2000.

Claims (23)

1. one kind is used to control the method that hot mechanical slurry (TMP) finish grindes procedure segment, described procedure segment comprises at least one first refiner, it has a plurality of sensors on the precalculated position on the refiner plates that is arranged in described at least one first refiner (33), described method comprises: measure, estimate that alternatively expression is at the external status (η outside the described refiner of described procedure segment ₁, Q ₁) one or more process variables; And measure, alternatively estimate, represent the one or more internal state (ζ within described at least one first refiner ₁) one or more values, and operate one or more variable (u ₁) possibility, it is characterized in that:, use the internal state (ζ of described at least one refiner by means of the mathematical procedure model ₁) described measurement and at described one or more process external status (η of described procedure segment ₁, Q ₁) measurement, calculate described at least one manipulated variable (u at described at least one refiner ₁) change.

2. method according to claim 1 is characterized in that, wherein said mathematical procedure model is described by one group of nonlinear differential equation or difference equation with vector value nonlinear function.

3. method according to claim 1 is characterized in that, wherein said mathematical procedure model is described by one group of linear differential equation or difference equation.

4. method according to claim 1 is characterized in that, wherein said mathematical procedure model is described by Laplace transform and transfer function.

5. method according to claim 1 is characterized in that, using wherein said internal state is temperature (T ₁) measurement come computational process to change, described temperature (T ₁) use along the temperature survey array of the radius of the dish within described at least one refiner and calculate.

6. method according to claim 1 is characterized in that, computational process changes and changes at least one manipulated variable, to influence slurry quality (Q ₁) measurement or the change of estimation.

7. method according to claim 1 is characterized in that, computational process changes and change at least one manipulated variable, with the particular energy input (E of influence to described at least one first refiner ₁) or the motor load (M of described at least one first refiner ₁) change.

8. method according to claim 1 is characterized in that, uses described mathematical procedure model to minimize the function of internal state and/or external status or the deviation between measured value and the reference value.

9. method according to claim 1 is characterized in that, uses described mathematical procedure model to minimize the estimated value of internal state and/or external status and the deviation between the reference value.

10. method according to claim 1 is characterized in that, will be fed to second refiner from the output of described at least one first refiner, so that described procedure segment comprises the two-stage refiner.

11. method according to claim 9 is characterized in that, by means of Mathematical Modeling, uses the internal state (ζ of described second refiner ₂) measurement and at described one or more external status (η of described procedure segment ₂, Q ₂) measurement, calculate at least one manipulated variable (u at described second refiner ₂) process change.

12. method according to claim 1 is characterized in that, uses the internal state (ζ at each refiner ₁, ζ ₂) described at least one measurement and at the external status (η of each refiner ₁, η ₂) measurement and described second refiner after (the Q of mass measurement at least ₂), calculate the process change of at least one manipulated variable of the procedure segment that comprises two or more refiners.

13. method according to claim 1 is characterized in that, uses the internal state (ζ at each refiner ₁, ζ ₂) described measurement and at the external status (η of each refiner ₁, η ₂) measurement and the mass measurement (Q of described second refiner ₂), calculate the process change of at least one manipulated variable of the procedure segment that comprises two or more refiners, so that optimize energy input to described procedure segment.

14. method according to claim 1 is characterized in that, using wherein said internal state is pressure (P ₁) measurement come computational process to change, described pressure (P ₁) use along the measurement array of the radius of the dish within described at least one refiner and calculate.

15. computer program that is used to control the procedure segment of hot mechanical slurry (TMP) correct grinding, comprise software code part or computer code, it directly can be loaded in the internal storage of numerical calculation, so that computer or processor are carried out the step according to the method for claim 1.

16. system that comprises the procedure segment that is used for hot mechanical slurry (TMP) correct grinding, described procedure segment comprises at least one first refiner (33), it has a plurality of sensors (21) in the precalculated position on the refiner plates that is arranged in described at least one first refiner (20), and described method comprises: surveyingpin is to one or more external procedure variable (η of described procedure segment ₁, Q ₁); And measure one or more internal state (ζ in described at least one first refiner ₁), it is characterized in that arrange that being used for application process changes to monitor and to control the device of described at least one first refiner, wherein said process change is by means of Mathematical Modeling, uses the internal state (ζ of described at least one refiner ₁) described measurement and at described one or more external procedure variable (η of described procedure segment ₁, Q ₁) measurement, at least one manipulated variable (u of described at least one refiner ₁) calculate and come.

17. system according to claim 16 is characterized in that, one or more in described a plurality of sensors (21) are arranged on the effective radius of making beating dish of the refiner in the described procedure segment.

18. system according to claim 16 is characterized in that, described procedure segment comprises two or more refiners (33,34) that are connected in series.

19. system according to claim 16 is characterized in that, described procedure segment comprises two or more refiners that are connected in parallel.

20. system according to claim 16 is characterized in that, described system also comprises the one or more control modules that are arranged as Control and Optimization device (32).

21. system according to claim 16 is characterized in that, described system also comprises the one or more control modules that are arranged as state estimator (39).

22. system according to claim 14 is characterized in that, described system also comprises memory storage device, and wherein storage is used to carry out the one or more computer programs according to the method for claim 1.

23., handle in the following tabulation each process in order to monitoring and control: slurry, paper, wood pulp, cellulose slurry according to the purposes of each described system among the claim 16-22.

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