CN110639685A - Coordinated optimization control method of grinding system - Google Patents
Coordinated optimization control method of grinding system Download PDFInfo
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- CN110639685A CN110639685A CN201910871367.3A CN201910871367A CN110639685A CN 110639685 A CN110639685 A CN 110639685A CN 201910871367 A CN201910871367 A CN 201910871367A CN 110639685 A CN110639685 A CN 110639685A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
Abstract
The invention discloses a coordinated optimization control method of a grinding system, belonging to the technical field of automatic control and comprising the following steps: acquiring controlled variables and manipulated variables from a distributed control system; calculating the next controlled variable according to the functional relation between the controlled variable and the manipulated variable so that the distributed control system can adjust the controlled variable in the grinding system according to the next controlled variable; and (3) carrying out real-time dynamic optimization on the yield of the system by adopting expert loop control, and setting a limiting condition for the dynamic yield optimization. Compared with the traditional method that whether the rotating speed of the circulating fan needs to be increased or not is judged according to the visual sense of the operator on the yield, the method is more accurate.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to a coordinated optimization control method of a grinding system.
Background
The roller press grinding system is a commonly used technological configuration in a grinding system, and the control process of the existing grinding system generally depends on manual adjustment of the system according to the laboratory timing manual sampling test result. The main problems with this approach are: firstly, according to the difference of the easy abrasiveness of material, system's output exists undulantly, lead to the little storehouse load undulantly thereupon, well accuse operator only just can adjust little storehouse feeding when little storehouse position in storehouse has obvious change, the manual adjustment of the little storehouse feeding of the small in storehouse of the low frequency by a wide margin, can't accomplish the stable control to little storehouse position in storehouse, when can't guarantee low position in storehouse operation, the untimely empty storehouse of operation is taken care of, also can't guarantee the stability of entering roll squeezer material particle distribution, and then can't guarantee the high-efficient stable operation of roll squeezer. Secondly, the manual adjustment mode cannot adjust the system in real time, the fluctuation of the process parameters is large, and the stability cannot be ensured. While the technological parameters fluctuate, operators need to ensure the quality of finished cement products to be qualified, and inevitably grind the cement into thinner products, so that the specific surface area of the cement is higher, the clamping edge optimization cannot be achieved, and the waste of the system capacity is caused. Thirdly, the manual adjustment mode of operators, because different operators have different operation habits and adjustment modes, the operation consistency of the system cannot be ensured. Meanwhile, operators adjust the system based on current system parameters, mostly depend on respective operation experiences, and do not have a scientific and reasonable calculation method for the adjustment amplitude under the condition of low adjustment frequency.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and realize the accurate control of the grinding system.
In order to achieve the above object, a coordinated optimization control method of a grinding system is adopted, which comprises the following steps S1 to S6:
s1, acquiring controlled variables and manipulated variables from the distributed control system;
s2, calculating the next controlled variable according to the functional relation between the controlled variable and the manipulated variable, so that the distributed control system can adjust the controlled variable in the grinding system according to the next controlled variable;
s3, calculating the average yield of the grinding system in the current period t1 every other fixed period t1, and comparing the calculated average yield with the average yield of the grinding system in the last period t 1;
s4, if the average output of the grinding system in the current period t1 is increased, the rotating speed of the circulating fan is continuously increased;
s5, if the average output of the grinding system in the current period t1 is unchanged, keeping the rotating speed of the circulating fan unchanged;
and S6, if the average output of the grinding system in the current period t1 is reduced, reducing the rotating speed of the circulating fan.
Further, the grinding system comprises an open circuit grinding system, a raw material final grinding system and a double closed circuit grinding system.
Further, when the pulverizing system is an open circuit mill system or a double closed circuit mill system, after the step S2, the method further includes:
comparing the specific surface area of the product detected by the laboratory in a fixed sampling time period with the specific surface area of the product detected on line, and if the difference between the specific surface area of the product detected on line and the specific surface area of the product detected by the laboratory is greater than a certain allowable value, keeping the rotating speed of the circulating fan unchanged;
if the value is not greater than the allowable value, the steps S3-S6 are executed in sequence.
Further, when the grinding system is a raw material final grinding system, the method further comprises the following steps:
and comparing the screen residue detected by the laboratory in the sampling time period with the screen residue detected on line every fixed sampling time period, and if the difference between the screen residue detected on line and the screen residue detected by the laboratory is less than a certain allowable value, keeping the rotating speed of the circulating fan unchanged.
If not, the steps S3-S6 are executed in sequence.
Further, when the milling system is an open mill system or a raw meal finish milling system, a first powder concentrator is arranged in the roller press system, and after the step S2, the method further includes:
calculating the average rotating speed of the first powder concentrator in the current period t2 every other fixed period t2, and comparing the average rotating speed of the first powder concentrator in the current period t2 with a set average rotating speed value;
if the average rotating speed of the first powder concentrator in the current period t2 is greater than the set average rotating speed value, the rotating speed of the circulating fan is unchanged;
and if the average rotating speed of the first powder concentrator in the current period t2 is less than or equal to the set average rotating speed value, sequentially executing the steps S3-S6.
Further, when the grinding system is a double closed-circuit grinding system, a first powder concentrator and a second powder concentrator are arranged in the roller press system, and the double closed-circuit grinding system further comprises:
calculating the average rotating speed of the first powder concentrator in the current period t3 every other fixed period t3, and comparing the average rotating speed of the first powder concentrator in the current period t3 with a set first average rotating speed value;
if the average rotating speed of the first powder concentrator in the current period t3 is greater than the set first average rotating speed value, the rotating speed of the circulating fan is unchanged;
if the average rotating speed of the first powder concentrator in the current period t3 is less than or equal to the set first average rotating speed value, sequentially executing the steps S3-S6;
calculating the average rotating speed of the second powder concentrator in the period t4 every fixed period t4, and comparing the average rotating speed with a set second rotating speed value;
if the average rotating speed of the second powder concentrator in the period t4 is greater than the set second rotating speed value, the rotating speed of the circulating fan is unchanged;
and if the average rotating speed of the second powder concentrator in the period t4 is less than or equal to the set second rotating speed value, executing according to the judgment result of yield optimization.
Further, the step of calculating the next controlled variable according to the functional relationship between the controlled variable and the manipulated variable to enable the distributed control system to adjust the controlled variable in the grinding system according to the next controlled variable includes:
establishing a functional relation between the controlled variable and the manipulated variable to obtain a linear combination matrix between the controlled variable and the manipulated variable;
calculating the next controlled variable according to a pre-constructed controlled variable calculation model, wherein the pre-constructed controlled variable calculation model is as follows:
wherein: u. oftIs the controlled variable of the next step, ut-1W is a soft tracking trajectory matrix, H is a linear combination matrix between the controlled variables and the manipulated variables, G is the controlled variables of the previous step2Is a model parameter coefficient matrix, lambda is a control weighting coefficient, gamma is a step factor, NU is a control step length, and T is a transposed symbol;
and sending the next controlled variable to the distributed control system, so that the distributed control system adjusts the controlled variable in the grinding system according to the next controlled variable.
Further, the establishing a functional relationship between the controlled variable and the manipulated variable to obtain a linear combination matrix between the controlled variable and the manipulated variable includes:
establishing a functional relation between the controlled variable and the manipulated variable as follows: a (q)-1)yt＝B(q-1)ut-d+ξtA,/Δ, wherein A (q)-1)＝a0+a1q-1…anαq-1；B(q-1)＝b0+b1q-1…bnbq-1，ytIs a manipulated variable at time t, utThe controlled variable, { ξ, { which represents time ttD is the minimum pure delay step number of the system, delta is a difference factor, and delta is 1-q-1，q-1Is a backward translation factor;
substituting the acquired manipulated variable and controlled variable intoThe functional relation between the controlled variable and the manipulated variable, and the identification coefficient A (q)-1) And B (q)-1) Thereby obtaining a linear combination matrix between the manipulated variables and the controlled variables.
Further, when the grinding system is an open-circuit grinding system, the system comprises three groups of controlled variables and manipulated variables, namely a mill tail row and grinding head negative pressure, a roller press system powder concentrator, finished product quality, total feeding amount and small bin weight;
when the grinding system is a double closed-circuit grinding system, the system comprises four groups of controlled variables and manipulated variables, namely negative pressure of a tail row and a grinding head of the grinding machine, quality of a powder selecting machine and a finished product of the grinding system, current of the powder selecting machine and the grinding machine of a roller press system, total feeding amount and weight of a small bin;
when the cement grinding system is a raw material final grinding system, the system comprises two groups of controlled variables and manipulated variables, namely a powder concentrator of a roller press system, the quality of finished products, the total feeding amount and the weight of a small bin.
Compared with the prior art, the invention has the following technical effects: the invention applies the advanced process control algorithm to the grinding system and carries out real-time on-line adjustment on the controlled variable of the system according to the manipulated variable. And by means of an expert control loop, according to the integral of the real-time yield of the DCS in the period t1, averaging to the time period t1 to obtain the average yield in the time period t1, and according to the average yield of the system in the adjacent period t1, carrying out real-time dynamic optimization on the yield of the system. Compared with the traditional method that whether the rotating speed of the circulating fan needs to be increased or not is judged according to the visual sense of the operator on the yield, the method is more accurate.
Drawings
The following detailed description of embodiments of the invention refers to the accompanying drawings in which:
fig. 1 is a flow chart diagram of a coordinated optimization control method of a grinding system;
FIG. 2 is a schematic diagram of an open circuit mill control system;
FIG. 3 is a schematic diagram of a dual closed circuit grinding system;
fig. 4 is a schematic structural diagram of a raw material final grinding system.
Detailed Description
To further illustrate the features of the present invention, refer to the following detailed description of the invention and the accompanying drawings. The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present disclosure.
As shown in fig. 1, the present embodiment discloses a coordinated optimization control method for a pulverizing system, which includes the following steps S1 to S6:
s1, acquiring controlled variables and manipulated variables from the distributed control system;
s2, calculating the next controlled variable according to the functional relation between the controlled variable and the manipulated variable, so that the distributed control system can adjust the controlled variable in the grinding system according to the next controlled variable;
s3, calculating the average yield of the grinding system in the current period t1 every other fixed period t1, and comparing the calculated average yield with the average yield of the grinding system in the last period t 1;
specifically, in this embodiment, the average yield in the t time period is obtained by integrating the real-time yield of a Distributed Control System (DCS) in the t time period and averaging the integrated real-time yield to the t time period, which is more accurate than the conventional method of directly judging the average yield of the System by manpower.
S4, if the average output of the grinding system in the current period t1 is increased, the rotating speed of the circulating fan is continuously increased;
s5, if the average output of the grinding system in the current period t1 is unchanged, keeping the rotating speed of the circulating fan unchanged;
and S6, if the average output of the grinding system in the current period t1 is reduced, reducing the rotating speed of the circulating fan.
In the embodiment, after the controlled variables of the system are adjusted online in real time according to the manipulated variables, the expert control loop is adopted to dynamically optimize the yield of the system, the average yield of the system in adjacent periods is compared, and the rotating speed of the circulating fan is controlled according to the comparison result, so that the yield of the system is accurately controlled in real time.
It should be noted that the grinding system includes an open circuit grinding system, a raw material final grinding system and a double closed circuit grinding system.
Specifically, when the pulverizing system is an open circuit mill system or a double closed circuit mill system, after the step S2, the method further includes:
and comparing the specific surface area of the product detected by the laboratory in a fixed sampling time period with the specific surface area of the product detected on line, and if the difference between the specific surface area of the product detected on line and the specific surface area of the product detected by the laboratory is greater than a certain allowable value, keeping the rotating speed of the circulating fan unchanged. The value of the limit value can be 10, and technicians can also carry out debugging and verification according to field requirements.
If the value is not greater than the allowable value, the steps S3 to S6 are performed in sequence.
It should be noted that the specific surface area detected by the laboratory is the standard for controlling the quality of cement, and the specific surface area detected on line is the standard for automatically controlling the cement, and the detection results of the two may have a deviation. Under the condition of small deviation, performing control by on-line detection; when the specific surface area of the product detected on line is much larger than that of the product detected in a laboratory, the result of the laboratory is used as the standard for ensuring the cement quality, and at the moment, the rotating speed of the circulating fan is not increased any more, namely the yield is not lifted upwards, so that the cement is ground to be finer, and the cement quality is ensured.
Specifically, when the grinding system is a raw material final grinding system, the method further comprises:
and comparing the screen residue detected by the laboratory in the sampling time period with the screen residue detected on line every fixed sampling time period, and if the difference between the screen residue detected on line and the screen residue detected by the laboratory is less than a certain allowable value, keeping the rotating speed of the circulating fan unchanged. Wherein, the value of the limit value can be-0.5, and technicians can also carry out debugging and verification according to the field requirements.
In the embodiment, the on-line residue is measured by an on-line laser particle size analyzer based on the laser diffraction principle, the particle size distribution is measured according to different diffraction angles of particles with different sizes, and the residue is calculated; the laboratory screen residue is obtained by placing a certain amount of raw material powder in a screen, vibrating for a period of time, allowing fine particles to leak, and allowing coarse particles to remain, weighing the coarse particles, and calculating the weight percentage of the coarse particles in the total experimental total material to obtain the screen residue.
In this embodiment, the oversize detected by the laboratory is the standard for controlling the quality of raw meal, the oversize detected on line is the standard for automatically controlling the grinding of raw meal, and the detection results of the two may have deviation. Under the condition of small deviation, performing control by on-line detection; when the screen residue detected by the online detection is much smaller than that detected by a laboratory, the result of the laboratory is used as the standard for ensuring the quality of the raw material finished product, and the rotating speed of the circulating fan is not increased any more, namely the raw material is not lifted upwards to increase the yield, so that the raw material is ground to be finer, and the quality of the raw material is ensured.
In particular, in the fixed sampling period described in this embodiment, the laboratory generally tests the raw meal remaining for one time in 1 hour or 2 hours, and the sampling period for online detection needs to correspond to the sampling period of the laboratory, which is also 1 hour or 2 hours.
Specifically, when the milling system is an open mill system or a raw meal finish milling system, a first powder concentrator is disposed in the roller press system, and after step S2, the method further includes:
calculating the average rotating speed of the first powder concentrator in the current period t2 every other fixed period t2, and comparing the average rotating speed of the first powder concentrator in the current period t2 with a set average rotating speed value;
if the average rotating speed of the first powder concentrator in the current period t2 is greater than the set average rotating speed value, the rotating speed of the circulating fan is unchanged;
and if the average rotating speed of the first powder concentrator in the current period t2 is less than or equal to the set average rotating speed value, sequentially executing the steps S3-S6.
It should be noted that, the process is the same as the process for obtaining the average yield, and the obtaining of the average rotating speed here is also based on the integral of the real-time rotating speed of the powder concentrator of the DCS in the time period t2, and then averaging the integral to the time period t2 to obtain the average rotating speed in the time period t 2.
The set rotation speed value is obtained according to the operation experience of each site operator, and the numerical value of each site is different. The method is related to the field process configuration and the grindability of materials. The maximum value of the rotating speed of the powder concentrator is determined in the previous operation process of an operator under the conditions of normal raw material condition, normal mechanical equipment, stable production process and qualified finished product quality.
It should be noted that, in a normal production line, the process configuration and the raw material condition should have a corresponding adjustment range of the equipment, and the adjustment range is obtained through a production test at the initial debugging stage. The rotating speed value set by the powder concentrator is the maximum rotating speed value of the powder concentrator, and after the rotating speed value exceeds the maximum rotating speed value, the grindability of the materials is not good, the yield is not increased, and therefore the circulating fan is not started.
Particularly, when the grinding system is a double closed-circuit grinding system, a first powder concentrator and a second powder concentrator are arranged in the roller press system, and the double closed-circuit grinding system further comprises:
calculating the average rotating speed of the first powder concentrator in the current period t3 every other fixed period t3, and comparing the average rotating speed of the first powder concentrator in the current period t3 with a set first average rotating speed value;
if the average rotating speed of the first powder concentrator in the current period t3 is greater than the set first average rotating speed value, the rotating speed of the circulating fan is unchanged;
if the average rotating speed of the first powder concentrator in the current period t3 is less than or equal to the set first average rotating speed value, sequentially executing the steps S3-S6;
calculating the average rotating speed of the second powder concentrator in the period t4 every fixed period t4, and comparing the average rotating speed with a set second rotating speed value;
if the average rotating speed of the second powder concentrator in the period t4 is greater than the set second rotating speed value, the rotating speed of the circulating fan is unchanged;
and if the average rotating speed of the second powder concentrator in the period t4 is less than or equal to the set second rotating speed value, executing according to the judgment result of yield optimization.
It should be noted that, in this embodiment, the average rotation speed of the two powder separators is controlled, so as to ensure that the equipment operates within a normal rotation speed range.
Specifically, the process flow of the open circuit grinding is shown in fig. 2, wherein: 1 is a batching belt; 2 is a weighing bin; 3 is a manual bar valve; 4 is a pneumatic valve; 5, a roller press; 6 is a material cake hoister; 7 is a V-shaped powder concentrator; 8 is a roller press system powder concentrator; 9 is a cyclone cylinder; 10 is a flap valve; 11 is a circulating fan; 12 is a ball mill; 13 is a flap valve; 14 is a milling chute; 15 is a chute fan; 16 is a mill discharging hoister; 17 is a chute; 18 is a chute fan; 19 is a wind discharging dust collector; 20 is a wind discharging and dust collecting fan; 21 is a tail grinding dust collector; 22 is a tail grinding dust collecting fan; 23 is an iron remover. The process flow is as follows:
the method comprises the steps of proportioning materials such as clinker, mixed materials and the like according to a certain proportion, deironing the materials by a belt conveyor through a belt deironing device, feeding the materials and cakes extruded by a roller press into a cake elevator, and then feeding the materials and cakes into a V-shaped classifier (V selection) for dispersion and classification by the cake elevator, wherein coarse materials enter the roller press for secondary extrusion through a weighing bin, fine materials are further separated by adjusting the rotating speed through the frequency conversion of an upper efficient powder concentrator, fine powder is brought into a cylinder for collection along with air, and coarse powder also enters the roller press for secondary extrusion through the weighing bin. The cyclone cylinder collects fine powder and sends the fine powder to a subsequent ball mill grinding process through a chute.
The air for the whole pre-grinding system of the roller press is induced by a circulating fan, most of the dust-containing air after being collected by a cyclone cylinder passes through the circulating fan, the dust-containing air returns to V to be selected for internal circulation, a small part of the dust-containing air is introduced into an air discharge dust collector and a fan for treatment, the collected dust is ground in a mill, and the waste gas is discharged to the atmosphere. The grinding powder comprises fine powder collected by a cyclone cylinder of a pre-grinding system of a roller press, fine powder collected by an air-bleeding dust collector, possibly added fly ash ingredients and the like, and the cement grinding is further realized by a ball mill. The materials entering the ball mill are ground and then sent to a mill elevator through a mill tail chute, namely cement finished products are obtained, and the cement finished products are conveyed to a cement storage bin through a finished product chute. The ventilation and dust collection in the mill are carried out by a mill tail dust collector and a mill tail dust collection fan, and the fine powder collected by the mill tail dust collector is also taken as a cement finished product and is conveyed to a cement storage room together with the fine powder obtained by grinding by the ball mill by a finished product chute.
The structure of the open circuit mill system is combined to determine that three groups of controlled variables and manipulated variables in the open circuit mill system are respectively mill tail row and grinding head negative pressure, mill concentrator system powder concentrator and finished product quality, total feeding amount and small bin weight.
Specifically, the process flow of the double closed circuit grinding system is shown in fig. 3, wherein: 1 is a batching belt; 2 is a weighing bin; 3 is a manual bar valve; 4 is a pneumatic valve; 5, a roller press; 6 is a material cake hoister; 7 is a V-shaped powder concentrator; 8 is a roller press system powder concentrator; 9 is a cyclone cylinder; 10 is a flap valve; 11 is a circulating fan; 12 is a ball mill; 13 is a flap valve; 14 is a milling chute; 15 is a chute fan; 16 is a mill discharging hoister; 17 is a chute; 18 is a chute fan; 19 is a mill system powder concentrator; 20 is a chute; 21 is a chute fan; 24 is a dust collector of the grinding system; 25 is a fan; 26 is a dust collecting fan; 27 is a chute; 28 is a chute fan; 29 is a tail grinding dust collector; 30 is a tail grinding dust collecting fan; 31 is a travelling crane; 32 is a butterfly valve; and 33 is a butterfly valve. The process flow is as follows:
the method comprises the steps of proportioning materials such as clinker, mixed materials and the like according to a certain proportion, conveying the materials into a weighing bin of a pre-grinding system of a roller press after deironing by a belt conveyor through a belt deironing device, extruding the materials by the roller press, conveying the materials into a V-shaped classifier (V selection) by a cake elevator for dispersing and classifying, wherein coarse materials are returned to the weighing bin for secondary extrusion, fine materials are subjected to frequency conversion adjustment of rotating speed by an upper efficient powder concentrator for further separation, fine powder is conveyed into a cyclone cylinder along with wind for collection, and coarse powder is also returned to the weighing bin of the roller press for re-extrusion. The cyclone cylinder collects fine powder and sends the fine powder to a subsequent ball mill grinding process through a chute. The air for the whole pre-grinding system of the roller press is induced by a circulating fan, most of the dust-containing air after being collected by a cyclone cylinder passes through the circulating fan, the dust-containing air returns to V to be selected for internal circulation, a small part of the dust-containing air is introduced into an air discharge dust collector and a fan for treatment, the collected dust is ground in a mill, and the waste gas is discharged to the atmosphere. The grinding process of the ball mill adopts a closed-circuit grinding system process, the materials discharged from the ball mill are lifted to a powder selecting machine of a grinding system through a mill discharging hoister, coarse powder returns to the ball mill for re-grinding after powder selection, and fine powder is collected by a system dust collector to be used as a finished product of ground cement and sent to a subsequent cement warehouse. And an independent tail grinding dust collection system, a dust collector, a tail grinding fan and the like are configured in consideration of ventilation of the ball mill, and the collected fine powder is used as a cement finished product to be put in storage.
The process flow of the combined double closed-circuit grinding system determines that the control process comprises four groups of controlled variables and manipulated variables, namely negative pressure of a tail row and a grinding head of the grinding machine, quality of a powder concentrator and a finished product of the grinding system, current of the powder concentrator and the grinding machine of the roller press system, total feeding amount and weight of a small bin.
Specifically, the process flow diagram of the raw meal finish grinding system is shown in fig. 4, in which: 1 is a batching belt; 2 is a weighing bin; 3 is a manual bar valve; 4 is a pneumatic valve; 5, a roller press; 6 is a material cake hoister; 7 is a V-shaped powder concentrator; 8 is a powder concentrator; 9 is a cyclone cylinder; 10 is a flap valve; 11 is a circulating fan; 12 is a material cake hoister; 13 is a chute; 14 is a chute fan; 15 is an iron remover; 16 is a dust collector; 17-20 are electric butterfly valves. The process flow is as follows:
conveying mixed raw materials (limestone, clay, iron sand, shale and the like) from a raw material proportioning bin to a roller press workshop through a belt conveyor, feeding the mixed raw materials and materials out of a roller press into an airflow classifier for drying and sorting, returning the sorted coarse powder to a steady flow weighing bin of the roller press through an elevator, re-extruding the materials in the weighing bin through the roller press, and feeding the materials into a feeding hole of a static airflow classifier (V-selection) through another elevator; the fine powder after V-sorting enters the efficient powder sorting machine along with the airflow, is subjected to secondary sorting by the powder sorting machine, the coarse powder returns to the weighing bin of the roller press to be ground again, and the fine powder enters the cyclone cylinder along with the airflow to be collected as a finished product and is conveyed to a warehousing elevator by the air conveying chute. And after the dust-containing gas out of the cyclone cylinder is discharged by the circulating fan, part of the dust-containing gas returns to the V-shaped separation as circulating air to participate in powder separation again, and the rest dust-containing gas flow is directly discharged into a dust collector at the tail of the kiln and is discharged into the atmosphere by the fan after dust collection and purification. Therefore, in combination with the process flow of the raw material final grinding system, the raw material final grinding system comprises two groups of controlled variables and manipulated variables, namely the powder concentrator of the roller press system, the quality of finished products, the total feeding amount and the weight of the small bin.
Further, the above step S2: calculating the next controlled variable according to the functional relation between the controlled variable and the manipulated variable, so that the distributed control system realizes the adjustment of the controlled variable in the grinding system according to the next controlled variable, wherein the steps of S21-S23 are as follows:
s21, establishing a functional relation between the controlled variable and the manipulated variable to obtain a linear combination matrix between the controlled variable and the manipulated variable;
s22, calculating the next controlled variable according to a pre-constructed controlled variable calculation model, wherein the pre-constructed controlled variable calculation model is as follows:
wherein: u. oftIs the controlled variable of the next step, ut-1W is a soft tracking trajectory matrix, H is a linear combination matrix between the controlled variables and the manipulated variables, G is the controlled variables of the previous step2Is a model parameter coefficient matrix, lambda is a control weighting coefficient, gamma is a step factor, NU is a control step length, and T is a transposed symbol;
and S23, sending the controlled variable of the next step to the distributed control system, so that the distributed control system adjusts the controlled variable in the grinding system according to the controlled variable of the next step.
Further, the above step S21: establishing a functional relation between the controlled variable and the manipulated variable to obtain a linear combination matrix between the controlled variable and the manipulated variable, comprising the following steps:
establishing a functional relation between the controlled variable and the manipulated variable as follows: a (q)-1)yt＝B(q-1)ut-d+ξtA,/Δ, wherein A (q)-1)＝a0+a1q-1…anαq-1；B(q-1)＝b0+b1q-1…bnbq-1，ytIs a manipulated variable at time t, utThe controlled variable, { ξ, { which represents time ttIs a zero mean variance, bounded, uncorrelated, random noise sequence, d is the system minimum pure delay step number, a is a difference factor,Δ＝1-q-1，q-1is a backward translation factor;
substituting the obtained manipulated variable and controlled variable into a functional relation between the controlled variable and the manipulated variable, and identifying a coefficient A (q)-1) And B (q)-1) Thereby obtaining a linear combination matrix between the manipulated variables and the controlled variables.
The target value of the automatic control system in the embodiment is derived from sampled data, the accuracy is high, any slight change can be sensed, and therefore high-frequency adjustment can be performed, and the amplitude of each adjustment is reduced. And on the basis of automatic control, the total output is controlled by a circulating fan to realize the optimal control of the working condition of the ball mill and the output of the grinding system. Meanwhile, limiting conditions for real-time dynamic optimization of system output, such as average rotating speed, surplus screening, specific surface area and the like of the powder concentrator are set, so that excessive grinding is avoided for the system, limited grinding capacity can be used for production of more products, and the system output is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A coordinated optimization control method of a grinding system is characterized by comprising the following steps S1-S6:
s1, acquiring controlled variables and manipulated variables from the distributed control system;
s2, calculating the next controlled variable according to the functional relation between the controlled variable and the manipulated variable, so that the distributed control system can adjust the controlled variable in the grinding system according to the next controlled variable;
s3, calculating the average yield of the grinding system in the current period t1 every other fixed period t1, and comparing the calculated average yield with the average yield of the grinding system in the last period t 1;
s4, if the average output of the grinding system in the current period t1 is increased, the rotating speed of the circulating fan is continuously increased;
s5, if the average output of the grinding system in the current period t1 is unchanged, keeping the rotating speed of the circulating fan unchanged;
and S6, if the average output of the grinding system in the current period t1 is reduced, reducing the rotating speed of the circulating fan.
2. A coordinated optimization control method for a pulverizing system as set forth in claim 1, wherein said pulverizing system comprises an open-circuit mill system, a raw meal finish pulverizing system and a double closed-circuit mill system.
3. A method for controlling a grinding system according to claim 1, wherein when the grinding system is an open circuit grinding system or a double closed circuit grinding system, after the step S2, the method further comprises:
comparing the specific surface area of the product detected by the laboratory in a fixed sampling time period with the specific surface area of the product detected on line, and if the difference between the specific surface area of the product detected on line and the specific surface area of the product detected by the laboratory is greater than a certain allowable value, keeping the rotating speed of the circulating fan unchanged;
if the value is not greater than the allowable value, the steps S3-S6 are executed in sequence.
4. The method of claim 2, wherein when the grinding system is a raw meal finishing grinding system, the method further comprises:
and comparing the screen residue detected by the laboratory in the sampling time period with the screen residue detected on line every fixed sampling time period, and if the difference between the screen residue detected on line and the screen residue detected by the laboratory is less than a certain allowable value, keeping the rotating speed of the circulating fan unchanged.
If not, the steps S3-S6 are executed in sequence.
5. A method for controlling a grinding system according to claim 2, wherein when the grinding system is an open mill system or a raw meal finish grinding system, a first powder selector is provided in the roller press system, and after the step S2, the method further comprises:
calculating the average rotating speed of the first powder concentrator in the current period t2 every other fixed period t2, and comparing the average rotating speed of the first powder concentrator in the current period t2 with a set average rotating speed value;
if the average rotating speed of the first powder concentrator in the current period t2 is greater than the set average rotating speed value, the rotating speed of the circulating fan is unchanged;
and if the average rotating speed of the first powder concentrator in the current period t2 is less than or equal to the set average rotating speed value, sequentially executing the steps S3-S6.
6. The grinding system of claim 2, wherein when the grinding system is a double closed-circuit grinding system, a first powder concentrator and a second powder concentrator are disposed in the roller press system, further comprising:
calculating the average rotating speed of the first powder concentrator in the current period t3 every other fixed period t3, and comparing the average rotating speed of the first powder concentrator in the current period t3 with a set first average rotating speed value;
if the average rotating speed of the first powder concentrator in the current period t3 is greater than the set first average rotating speed value, the rotating speed of the circulating fan is unchanged;
if the average rotating speed of the first powder concentrator in the current period t3 is less than or equal to the set first average rotating speed value, sequentially executing the steps S3-S6;
calculating the average rotating speed of the second powder concentrator in the period t4 every fixed period t4, and comparing the average rotating speed with a set second rotating speed value;
if the average rotating speed of the second powder concentrator in the period t4 is greater than the set second rotating speed value, the rotating speed of the circulating fan is unchanged;
and if the average rotating speed of the second powder concentrator in the period t4 is less than or equal to the set second rotating speed value, executing according to the judgment result of yield optimization.
7. A method for controlling a grinding system according to claim 1, wherein said calculating the next step of controlled variables according to the functional relationship between the controlled variables and the manipulated variables, so that the distributed control system adjusts the controlled variables of the grinding system according to the next step of controlled variables, comprises:
establishing a functional relation between the controlled variable and the manipulated variable to obtain a linear combination matrix between the controlled variable and the manipulated variable;
calculating the next controlled variable according to a pre-constructed controlled variable calculation model, wherein the pre-constructed controlled variable calculation model is as follows:
wherein: u. oftIs the controlled variable of the next step, ut-1W is a soft tracking trajectory matrix, H is a linear combination matrix between the controlled variables and the manipulated variables, G is the controlled variables of the previous step2Is a model parameter coefficient matrix, lambda is a control weighting coefficient, gamma is a step factor, NU is a control step length, and T is a transposed symbol;
and sending the next controlled variable to the distributed control system, so that the distributed control system adjusts the controlled variable in the grinding system according to the next controlled variable.
8. A method for controlling a pulverizing system according to claim 7, wherein said establishing a functional relationship between the controlled variables and the manipulated variables to obtain a linear combination matrix between the controlled variables and the manipulated variables comprises:
establishing a functional relation between the controlled variable and the manipulated variable as follows: a (q)-1)yt＝B(q-1)ut-d+ξtA,/Δ, wherein A (q)-1)＝a0+a1q-1…anαq-1；B(q-1)＝b0+b1q-1…bnbq-1，ytIs a manipulated variable at time t, utThe controlled variable, { ξ, { which represents time ttD is the minimum pure delay step number of the system, delta is a difference factor, and delta is 1-q-1，q-1Is a backward translation factor;
substituting the obtained manipulated variable and controlled variable into a functional relation between the controlled variable and the manipulated variable, and identifying a coefficient A (q)-1) And B (q)-1) Thereby obtaining a linear combination matrix between the manipulated variables and the controlled variables.
9. A coordinated optimization control method for a pulverizing system as claimed in claim 7, wherein when the pulverizing system is an open circuit pulverizing system, the system comprises three groups of controlled variables and manipulated variables, which are mill tail row and grinding head negative pressure, roller press system powder concentrator and finished product quality, total feeding amount and small bin weight, respectively;
when the grinding system is a double closed-circuit grinding system, the system comprises four groups of controlled variables and manipulated variables, namely negative pressure of a tail row and a grinding head of the grinding machine, quality of a powder selecting machine and a finished product of the grinding system, current of the powder selecting machine and the grinding machine of a roller press system, total feeding amount and weight of a small bin;
when the grinding system is a raw material final grinding system, the system comprises two groups of controlled variables and manipulated variables, namely a powder selecting machine of a roller press system, the quality of finished products, the total feeding amount and the weight of a small bin.
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