CN111443597A - Device and method for controlling granularity of vertical mill mineral powder - Google Patents
Device and method for controlling granularity of vertical mill mineral powder Download PDFInfo
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Abstract
The invention provides a device and a method for controlling the granularity of vertical mill mineral powder, wherein the device comprises the following components: the control error acquisition unit is used for acquiring the control error of the granularity of the ore powder of the vertical mill; the first controller and the second controller are used for adjusting the rotating speed of the powder concentrator, and the rotating speed of the powder concentrator is adjusted by the controllers according to the error condition; the vertical mill grinding unit receives the mineral powder output by the powder concentrator, and performs vertical milling and grinding to obtain a mineral powder finished product; and the online granularity analysis unit is configured for performing online granularity analysis on the finished mineral powder product and transmitting an analysis result to the control error acquisition unit. The method comprises the following steps: obtaining the control error of the granularity of the vertical mill mineral powder; selecting a controller to adjust the rotating speed of the powder concentrator according to the error condition; and repeating the steps until the granularity of the vertical mill mineral powder meets the set target condition. The method has ideal control effect on the control of the complex industrial process of mineral powder production, and brings practical economic benefit increase for mineral powder factories.
Description
Technical Field
The invention relates to the field of intelligent control of cement, in particular to a device and a method for controlling the granularity of vertical mill mineral powder.
Background
The cement is the most basic and important raw material for the national infrastructure and national economic development, and is needed for building and road paving in life. The mineral powder used as the admixture of cement has the advantages of improving various properties of cement, such as cement strength, durability, workability and the like. The mineral powder with proper specific surface area is basically required, and the activity indexes of the mineral powder with different specific surface areas are different. At present, the domestic slag micropowder grinding production line reaches more than 400 bars, the capacity reaches 2.3 hundred million tons, and the production technology level and the quality of slag micropowder grinding need to be concerned while the slag micropowder grinding is high in yield. In the last 80 th century, DCS (distributed control system) is introduced, automatic control technology in the cement industry in China is developed rapidly, automation level is further improved in the 21 st century, and most of mineral powder factories in China still keep operators manually adjusting the rotating speed of a powder concentrator and the rotating speed of a main exhaust fan to control mineral powder production, so that a large amount of manpower resources are consumed, timely and accurate production control cannot be realized, and efficiency is low. Therefore, the intelligent control method is applied to mineral powder production, and the automation level of mineral powder production is improved urgently. The mineral powder production process is complex and changeable, and has the characteristics of large time lag, nonlinearity, time variation and the like, so that an accurate mathematical model of a controlled object is difficult to establish, and the controller is difficult to design and implement due to low model precision. In recent years, many researches on automatic control methods of mineral powder production process are carried out, such as fuzzy control, PID control and the like. The traditional control method lacks the adaptability to the change of model parameters and is often difficult to achieve the ideal control effect.
In a vertical grinding system of mineral powder, a powder concentrator and a main exhaust fan are key important devices, and the rotation speed of the powder concentrator determines the fineness of mineral powder discharged from a mill and stored in a warehouse. Slag from a slag storage enters an intermediate buffer bin, a quantitative feeding scale is arranged below the bin, and the slag is metered and sent into a vertical mill by a belt conveyor to be ground. The material fed into the vertical mill forms a stable material layer on the grinding disc and is crushed under the continuous action of the grinding pressure. The hot air introduced into the vertical mill sends the ground material into a high-efficiency powder concentrator arranged at the upper part of the vertical mill, the material is separated into fine powder and coarse powder under the action of the powder concentrator, the coarse powder falls into the millstone again, and the finer particles leave the powder concentrator along with the carrier gas, are collected by an external powder concentrator, and are sent into a finished product system through a chute and a lifter. The specific surface area of the mineral powder is influenced by the particle size distribution of the mineral powder, the specific surface area is required to be controlled to be 420 square meters per kg, and the control of the particle size of the mineral powder is very important for ensuring the quality of the mineral powder in a vertical mill grinding system.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention is directed to at least provide a device and a method for controlling the particle size of ore powder in a vertical mill, which are flexible and versatile compared to the conventional PID controller, have an ideal control effect on the complex industrial process control of the ore powder production, control the ore powder production timely and accurately, save the manpower consumption, and bring practical economic benefits to the ore powder plant.
To achieve the above and other related objects, an embodiment of the present invention provides an apparatus for controlling a particle size of a mill powder of a vertical mill, including:
the control error acquisition unit is configured for acquiring a control error of the granularity of the vertical mill mineral powder;
the first controller and the second controller are respectively used for adjusting the rotating speed of the powder concentrator, when the error meets a first set condition, the first controller is used for adjusting the rotating speed of the powder concentrator, and when the error meets a second set condition, the second controller is used for adjusting the rotating speed of the powder concentrator;
the vertical mill grinding unit is configured for receiving the mineral powder output by the powder concentrator, and performing vertical milling and grinding to obtain a mineral powder finished product;
and the online granularity analysis unit is configured for performing online granularity analysis on the finished mineral powder product and transmitting an analysis result to the control error acquisition unit.
Optionally, the first controller is a bang-bang controller.
Optionally, the second controller is an expert PID controller.
Optionally, the expert PID controller comprises:
the knowledge acquisition unit is used for acquiring historical data related to the granularity of the vertical mill mineral powder;
the knowledge base unit is used for storing the data acquired by the knowledge acquisition unit;
the inference machine is used for calculating parameter adjustment values according to the data in the knowledge base;
and the PID controller is used for receiving the calculation result of the inference engine and adjusting the parameters according to the result.
To achieve the above and other related objects, an embodiment of the present invention also provides a method for controlling a particle size of a vertical mill powder, comprising the steps of:
obtaining the control error of the granularity of the vertical mill mineral powder;
when the error meets a first set condition, adjusting the rotating speed of the powder concentrator by using a first controller;
when the error meets a second set condition, adjusting the rotating speed of the powder concentrator by using a second controller;
and repeating the steps until the granularity of the vertical mill mineral powder meets the set target condition.
Optionally, the first setting condition is: the control error is greater than the maximum value of the error set point.
Optionally, the second setting condition is: the control error is smaller than the minimum value of the error set value, or the control error is larger than or equal to the minimum value of the error set value and smaller than or equal to the maximum value of the error set value.
Optionally, the step of adjusting the rotational speed of the powder concentrator by the first controller comprises:
and the first controller is used for adjusting the rotating speed of the powder concentrator, so that the variation of the rotating speed of the powder concentrator is maximized.
Optionally, the step of adjusting the rotation speed of the powder concentrator by using the second controller comprises:
acquiring a middle value of the error setting value;
when e (k) × Δ e (k) > 0 or Δ e (k) ═ 0, and | e (k) | > MmidThen the output of the controller is:
u(k)＝u(k-1)±k1{kp[e(k)-e(k-1)]+kie(k)+kd[e(k)-2e(k-1)+e(k-2)]}；
when e (k) × Δ e (k) > 0 or Δ e (k) ≦ MmidThen the controller output is:
u(k)＝u(k-1)±kp[e(k)-e(k-1)]+kie(k)+kd[e(k)-2e(k-1)+e(k-2)]；
when e (k) Δ e (k) < 0 and Δ e (k) Δ e (k-1) < 0, and | e (k) | > MmidThen the output of the controller is:
u(k)＝u(k-1)±k1kpe(k)；
when e (k) < 0 and Δ e (k) < 0, and | e (k) | ≦ MmidThen controlThe output of the system is:
u(k)＝u(k-1)±k2kpe(k)；
when | e (k) | < MminThen the output of the controller is:
u(k)＝u(k-1)±kp[e(k)-e(k-1)]+kie(k)。
according to the technical scheme provided by the embodiment of the invention, the bang-bang controller and the expert PID controller are adopted to realize the control of the mineral powder granularity content smaller than 45 μm, parameters required by the expert rule setting controller are formulated according to expert experience, and the effectiveness of the composite control method is proved through simulation verification and field practice. Compared with the traditional PID controller, the controller is flexible and changeable, has ideal control effect on the complex industrial process control of mineral powder production, can timely and accurately control the mineral powder production, can save the manpower loss, and brings practical economic benefit increase for mineral powder factories.
Drawings
FIG. 1 is a schematic diagram of a vertical mill grinding process;
FIG. 2 shows a control block diagram;
FIG. 3 shows a control block diagram for an expert PID;
FIG. 4 is a graph showing the comparison of the ore powder particle size tracking effect of an expert PID controller and a PID controller;
FIG. 5 is a graph showing the particle size fluctuation curve under the action of the bang-bang controller and the expert PID controller;
FIG. 6 is a graph showing the particle size fluctuation under manual operator adjustment;
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
The schematic diagram of the vertical mill grinding process is shown in figure 1. The process flow of the opposite milling and grinding is briefly introduced as follows: slag from a slag storage enters an intermediate buffer bin, a quantitative feeding scale is arranged below the bin, and the slag is metered and sent into a vertical mill by a belt conveyor to be ground. The material fed into the vertical mill forms a stable material layer on the grinding disc and is crushed under the continuous action of the grinding pressure. Feeding hot air introduced into the vertical mill to send the ground material into a high-efficiency powder concentrator arranged at the upper part of the vertical mill, separating the material into fine powder and coarse powder under the action of the powder concentrator, dropping the coarse powder into a grinding disc again, enabling the fine particles to leave the powder concentrator along with carrier gas to be collected by an external powder concentrating dust collector, sending the fine particles into a finished product system through a chute and a lifter, installing an online particle size analyzer at a warehousing chute, and detecting the particle size distribution of the warehoused mineral powder, such as the content of particles smaller than 3 microns, 3-32 microns, smaller than 45 microns, larger than 80 microns and the like. The particle size distribution is transmitted to a central control room computer through Ethernet, and an operator can adjust the rotating speed of the powder concentrator according to the particle size distribution condition and the change of a particle size curve. The quality of the mineral powder is directly influenced by the condition of the mineral powder particle size distribution, and the mineral powder particle size distribution is controlled in a more reasonable range, so that the indexes of the mineral powder such as quality, activity index and the like are more stable.
The particle size content of the mineral powder smaller than 45 mu m is influenced by factors such as the rotating speed of the powder concentrator, the rotating speed of the main exhaust fan and the like, the influence of the rotating speed of the powder concentrator is most visual and main, and the influence of other factors can be ignored to a certain extent.
To achieve the above and other related objects, an embodiment of the present invention provides an apparatus for controlling a particle size of a mill powder of a vertical mill, including:
the control error acquisition unit is configured for acquiring a control error of the granularity of the vertical mill mineral powder;
the first controller and the second controller are respectively used for adjusting the rotating speed of the powder concentrator, when the error meets a first set condition, the first controller is used for adjusting the rotating speed of the powder concentrator, and when the error meets a second set condition, the second controller is used for adjusting the rotating speed of the powder concentrator;
the vertical mill grinding unit is configured for receiving the mineral powder output by the powder concentrator, and performing vertical milling and grinding to obtain a mineral powder finished product;
and the online granularity analysis unit is configured for performing online granularity analysis on the finished mineral powder product and transmitting an analysis result to the control error acquisition unit.
In one embodiment, the first controller is a bang-bang controller.
In one embodiment, the second controller is an expert PID controller.
In one embodiment, the expert PID controller includes:
the knowledge acquisition unit is used for acquiring historical data related to the granularity of the vertical mill mineral powder;
the knowledge base unit is used for storing the data acquired by the knowledge acquisition unit;
the inference machine is used for calculating parameter adjustment values according to the data in the knowledge base;
and the PID controller is used for receiving the calculation result of the inference engine and adjusting the parameters according to the result.
The specific algorithm and controller design process involved in the device is as follows:
the control block diagram of the present invention is shown in fig. 2. Wherein, yr(k) Representing the expected given value of the granularity content of the ore powder smaller than 45 mu m, y representing the real-time value (detected by online granularity analysis) of the granularity content of the ore powder smaller than 45 mu m, and u (k) representing the rotating speed of the powder concentrator. Firstly, the error range is judged, and the error range is sent to a bang-bang controller or an expert PID controller, and the rotating speed of the powder concentrator is calculated to act on a granularity control system so that the granularity content of the mineral powder smaller than 45 mu m can track the expected value.
In a complex industrial process of mineral powder grinding production, due to factors such as material uncertainty, sampling error and the like, real-time data fluctuation of an on-site online particle analyzer is large and cannot be directly used for a control process, and filtering processing is needed, so that a mean filtering method is adopted to carry out denoising processing on collected data.
The mean filter has the form:
wherein y (k) represents the average value of the particle size content of the mineral powder with the particle size of less than 45 mu m from the moment k-n +1 to the moment k, and n represents the number of the mean value filtering. And in the same way, y (k-1) represents the average value of the granularity content of the mineral powder with the granularity less than 45 mu m from the moment k-2n + 1 to the moment k-n, and y (k-2) represents the average value of the granularity content of the mineral powder with the granularity less than 45 mu m from the moment k-3n + 1 to the moment k-2 n.
The design of the controller follows.
First, a control error is defined as
Setting a maximum value of the deviation, denoted Mmax(ii) a The median value with a large deviation is set and recorded as Mmid(ii) a Setting a minimum value of deviation, denoted as Mmin. According to the setting of the deviation, the deviation increment and the deviation extreme value, a bang-bang controller and an expert PID controller can be designed, and the controller can be designed according to the following conditions:
(1) bang-bang controller
If | e (k) | > MmaxIt shows that the deviation is large, at this time, no matter how the deviation changes, it should be considered that selecting the bang-bang controller to make the variation of the controlled variable maximum to achieve the effect of quickly adjusting the deviation, so that | e (k) | is reduced at the maximum speed, and at the same time, overshoot is avoided, and the controller output is:
u(k)＝u(k-1)±Δumax(3)
this corresponds to the implementation of open loop control, which is a fast response to the extreme case of deviation.
(2) Expert PID controller
The structure of the PID controller is incremental, and the output of the conventional PID controller is as follows:
u(k)＝u(k-1)±kp[e(k)-e(k-1)]+kie(k)+kd[e(k)-2e(k-1)+e(k-2)](4)
wherein k isp,ki,kdProportional coefficient, integral coefficient and differential coefficient of PID controller, and k of expert PID when the deviation is differentp,ki,kdThe parameters are different.
Let e (k) denote the discretized offset value of the current sampling time, and e (k-1) and e (k-2) denote the offset values of the previous sampling time and the previous two sampling times, respectively, then the two offset increments can be obtained as:
(2.1) if Mmin≤|e(k)|≤Mmax
(2.1.1) when e (k) × Δ e (k) > 0 or Δ e (k) ═ 0, it indicates that the deviation is changed in a direction in which the absolute value of the deviation is increased, or the error is not changed by a fixed value.
At this time, if | e (k) | > MmidIndicating a large error, a strong control by the controller may be considered
The absolute value of the error is rapidly changed towards the decreasing direction, and the controller outputs:
u(k)＝u(k-1)±k1{kp[e(k)-e(k-1)]+kie(k)+kd[e(k)-2e(k-1)+e(k-2)]} (6)
in this case, if | e (k) | ≦ MmidIt is shown that although the deviation changes in the direction of increasing the absolute value of the deviation, the absolute value of the deviation itself is not so large, and it is conceivable that the controller performs a general control action, and the tendency of the change in the torsional error is changed in the direction of decreasing the absolute value of the error, and the controller outputs:
u(k)＝u(k-1)±kp[e(k)-e(k-1)]+kie(k)+kd[e(k)-2e(k-1)+e(k-2)](7)
(2.1.2) when e (k) × Δ e (k) < 0 and Δ e (k) × Δ e (k-1) > 0 or e (k) ═ 0, it indicates that the absolute value of the deviation is changing toward a decreasing direction, or that an equilibrium state has been reached. At this time, the controller output is unchanged.
(2.1.3) when e (k) Δ e (k) < 0 and Δ e (k) Δ e (k-1) < 0, the deviation is in an extreme value state.
If | e (k) | > MmidThe absolute value of the deviation is large, the controller can be considered to implement a strong control action, and the controller outputs:
u(k)＝u(k-1)±k1kpe(k) (8)
if | e (k) | ≦ MmidAbsolute value of deviation is comparedSmall, a weaker control action can be considered by the controller, and the controller output is:
u(k)＝u(k-1)±k2kpe(k) (9)
(2.2) if | e (k) | < MminAnd if the absolute value of the error is small, an integral link is added to reduce the steady-state error. The controller outputs are:
u(k)＝u(k-1)±kp[e(k)-e(k-1)]+kie(k) (10)
when the deviation is small to a certain degree, even the concept of dead zone can be introduced, and the system is stabilized without adjustment.
In the above formulas, u (k) and u (k-1) are respectively the kth output and the k-1 th output of the controller; mmax、Mmid、 MminRespectively, set error limits. Δ umaxOutputting the maximum constant value change of the bang-bang controller; k is a radical ofp,ki,kdIs an initial parameter of an expert PID controller, k1Is a gain amplification factor, k2Is the suppression factor. The controller design is completed up to this point, (4) the bang-bang controller output, and (6) - (10) the expert PID controller output under the established expert rules.
2.3matlab simulation
According to the existing modeling result, the mathematical model of the particle size content of the mineral powder smaller than 45 μm and the rotating speed of the powder concentrator can be expressed as follows:
wherein the initial parameter and PID parameter of the expert PID controller are selected as kp＝0.6，ki＝0.03，kd0.01, gain amplification factor k 12, suppression factor k2＝0.4，Mmax＝0.8，Mmid＝0.4，Mmin＝0.1，Δumax0.45. The simulation results are shown in fig. 3.
Fig. 4 compares the ore powder particle size tracking effect under the expert PID control with the ore powder particle size tracking effect under the PID control, so that it can be clearly seen that the expert PID controller has a higher regulation speed, a smaller overshoot, and a better performance than the PID controller.
2.4 field practice
And then compiling control software by combining the bang-bang controller and an expert PID controller control strategy to carry out field practice verification, and debugging the controller parameters.
Maximum increment delta u of bang-bang controllermax10, the initial parameter of the expert PID controller is selected as kp＝4，ki＝2，kd0.5, gain amplification factor k11.5, suppression factor k2＝0.5， Mmax＝2.5，Mmid＝1.5，Mmin0.5 is the margin of error. The values of the proportional coefficient, the integral coefficient and the differential coefficient of the expert PID controller under the expert rule are shown in the table 1:
TABLE 1 expert PID controller proportionality coefficient, integral coefficient, differential coefficient
According to experience obtained by quality examination of mineral powder of a mineral powder plant, when the content of the mineral powder with the particle size of less than 45 mu m is controlled to be 88 percent, the specific surface area of the mineral powder is qualified, so that the target value of the content of the mineral powder with the particle size of less than 45 mu m is set as yr(k) The actual effect of the 88 percent is shown in figures 4, 5 and table 2 when the method is applied to a mineral powder production site.
TABLE 2 Manual and automatic control operation report form of certain mineral powder group
Fig. 5 is a particle size fluctuation curve under automatic control, and fig. 6 is a particle size fluctuation curve under manual control. It can be clearly seen that under the condition that the powder concentrator is adjusted in two different modes, the expert PID controller adjusts the rotating speed of the powder concentrator to enable the fluctuation of the particle size curve to be smaller and have smaller overshoot, and the excessive grinding is prevented to improve the yield.
Table 2 is a running report of granularity manual and automatic control. Compared with manual control, the qualification rate of the specific surface area and the average bench time under automatic control are improved, the qualification rate of the specific surface area is improved by 6.25%, and the average bench time is improved by 3.99t and 3.005%. The quality of the mineral powder under automatic control is more stable, and the yield is higher.
To achieve the above and other related objects, an embodiment of the present invention also provides a method for controlling a particle size of a vertical mill powder, comprising the steps of:
obtaining the control error of the granularity of the vertical mill mineral powder;
when the error meets a first set condition, adjusting the rotating speed of the powder concentrator by using a first controller;
when the error meets a second set condition, adjusting the rotating speed of the powder concentrator by using a second controller;
and repeating the steps until the granularity of the vertical mill mineral powder meets the set target condition.
In one embodiment, the first setting condition is: the control error is greater than the maximum value of the error set point.
In one embodiment, the second setting condition is: the control error is smaller than the minimum value of the error set value, or the control error is larger than or equal to the minimum value of the error set value and smaller than or equal to the maximum value of the error set value.
In one embodiment, the step of adjusting the rotational speed of the powder concentrator by the first controller comprises:
and the first controller is used for adjusting the rotating speed of the powder concentrator, so that the variation of the rotating speed of the powder concentrator is maximized.
In one embodiment, the step of adjusting the rotation speed of the powder concentrator by using the second controller comprises:
acquiring a middle value of the error setting value;
when e (k) × Δ e (k) > 0 or Δ e (k) ═ 0, and | e (k) | > MmidThen the output of the controller is:
u(k)＝u(k-1)±k1{kp[e(k)-e(k-1)]+kie(k)+kd[e(k)-2e(k-1)+e(k-2)]}；
when e (k) × Δ e (k) > 0 or Δ e (k) ≦ MmidThen the controller outputsComprises the following steps:
u(k)＝u(k-1)±kp[e(k)-e(k-1)]+kie(k)+kd[e(k)-2e(k-1)+e(k-2)]；
when e (k) Δ e (k) < 0 and Δ e (k) Δ e (k-1) < 0, and | e (k) | > MmidThen the output of the controller is:
u(k)＝u(k-1)±k1kpe(k)；
when e (k) < 0 and Δ e (k) < 0, and | e (k) | ≦ MmidThen the output of the controller is:
u(k)＝u(k-1)±k2kpe(k)；
when | e (k) | < MminThen the output of the controller is:
u(k)＝u(k-1)±kp[e(k)-e(k-1)]+kie(k)。
the technical scheme of the invention has the beneficial effects that:
1. the controller designed by the bang-bang control and expert PID control method is applied to a vertical mill mineral powder granularity control system, is applied to field practice and obtains a better control effect;
2. the expert PID controller parameters are debugged by adopting the expert experience on site, the controller adjusts the value of the rotation speed of the powder concentrator on line, the ideal control effect is achieved on the control of the complex industrial process of mineral powder production, the mineral powder production is controlled timely and accurately, the manpower consumption can be saved, and the actual economic benefit increase is brought to enterprises.
3. The bang-bang controller and the expert PID controller are adopted to realize the control of the mineral powder granularity content smaller than 45 mu m, the parameters required by the expert rule setting controller are formulated according to the expert experience, and the effectiveness of the composite control method is proved through simulation verification and field practice. Compared with the traditional PID controller, the controller is flexible and changeable, has ideal control effect on the complex industrial process control of mineral powder production, can timely and accurately control the mineral powder production, can save the manpower loss, and brings practical economic benefit increase for mineral powder factories.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. An apparatus for controlling the particle size of a vertically ground ore powder, comprising:
the control error acquisition unit is configured for acquiring a control error of the granularity of the vertical mill mineral powder;
the first controller and the second controller are respectively used for adjusting the rotating speed of the powder concentrator, when the error meets a first set condition, the first controller is used for adjusting the rotating speed of the powder concentrator, and when the error meets a second set condition, the second controller is used for adjusting the rotating speed of the powder concentrator;
the vertical mill grinding unit is configured for receiving the mineral powder output by the powder concentrator, and performing vertical milling and grinding to obtain a mineral powder finished product;
and the online granularity analysis unit is configured for performing online granularity analysis on the finished mineral powder product and transmitting an analysis result to the control error acquisition unit.
2. The apparatus of claim 1, wherein the first controller is a bang-bang controller.
3. The apparatus according to claim 1 or 2, wherein the second controller is an expert PID controller.
4. The apparatus for controlling the particle size of vertical mill mineral powder according to claim 3, wherein the expert PID controller includes:
the knowledge acquisition unit is used for acquiring historical data related to the granularity of the vertical mill mineral powder;
the knowledge base unit is used for storing the data acquired by the knowledge acquisition unit;
the inference machine is used for calculating parameter adjustment values according to the data in the knowledge base;
and the PID controller is used for receiving the calculation result of the inference engine and adjusting the parameters according to the result.
5. A method for controlling the particle size of vertical mill ore powder is characterized by comprising the following steps:
obtaining the control error of the granularity of the vertical mill mineral powder;
when the error meets a first set condition, adjusting the rotating speed of the powder concentrator by using a first controller;
when the error meets a second set condition, adjusting the rotating speed of the powder concentrator by using a second controller;
and repeating the steps until the granularity of the vertical mill mineral powder meets the set target condition.
6. The method for controlling the particle size of the vertical mill mineral powder according to claim 5, wherein the first set condition is: the control error is greater than the maximum value of the error set point.
7. The method for controlling the particle size of the vertical mill mineral powder according to claim 5, wherein the second setting condition is: the control error is smaller than the minimum value of the error set value, or the control error is larger than or equal to the minimum value of the error set value and smaller than or equal to the maximum value of the error set value.
8. The method for controlling the particle size of the vertical mill mineral powder according to claim 5 or 6, wherein the step of adjusting the rotation speed of the powder concentrator by using the first controller comprises:
and the first controller is used for adjusting the rotating speed of the powder concentrator, so that the variation of the rotating speed of the powder concentrator is maximized.
9. The method for controlling the particle size of the vertical mill mineral powder according to claim 5 or 7, wherein the step of adjusting the rotation speed of the powder concentrator by using the second controller comprises:
acquiring a middle value of the error setting value;
when e (k) × Δ e (k) > 0 or Δ e (k) ═ 0, and | e (k) | > MmidThen the output of the controller is:
u(k)＝u(k-1)±k1{kp[e(k)-e(k-1)]+kie(k)+kd[e(k)-2e(k-1)+e(k-2)]}；
when e (k) × Δ e (k) > 0 or Δ e (k) ≦ MmidThen the controller output is:
u(k)＝u(k-1)±kp[e(k)-e(k-1)]+kie(k)+kd[e(k)-2e(k-1)+e(k-2)]；
when e (k) Δ e (k) < 0 and Δ e (k) Δ e (k-1) < 0, and | e (k) | > MmidThen the output of the controller is:
u(k)＝u(k-1)±k1kpe(k)；
when e (k) < 0 and Δ e (k) < 0, and | e (k) | ≦ MmidThen the output of the controller is:
u(k)＝u(k-1)±k2kpe(k)；
when | e (k) | < MminThen the output of the controller is:
u(k)＝u(k-1)±kp[e(k)-e(k-1)]+kie(k)。
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