Parameter control methods and systems, storage media and equipment for coal slurry water settling process

Abstract

This invention relates to a parameter control method for the coal slurry settling process. The method includes: starting a dosing pump based on operating signals during the coal washing process; determining the initial frequency setpoint of the dosing pump based on the coal type; collecting and preprocessing process data to obtain the actual values ​​of the mud layer interface height and the rake torque and pressure; adjusting the set mud layer interface height based on the actual values ​​of the rake torque and pressure under initial and normal operating conditions to obtain the mud layer interface height setpoint; controlling the start and stop of the dosing pump under abnormal operating conditions to restore the abnormal conditions to normal operating conditions; adjusting the current set frequency value of the dosing pump based on the mud layer interface height setpoint, the actual mud layer interface height, and the actual values ​​of the rake torque and pressure under both initial and normal operating conditions; and stopping the dosing pump based on a stop signal during the coal washing process. Its beneficial effects include reducing the incidence of "black run" (coal slurry runaway) and rake-related accidents, and achieving the rational addition of flocculants.

Description

Technical Field

[0001] This invention relates to the field of intelligent control technology for coal slurry water concentration and dosing, and in particular to a parameter control method and system, storage medium and equipment for the coal slurry water settling process. Background Technology

[0002] The coal slurry water thickening process treats the coal slurry water generated from the coal slurry sorting and plate pressing processes. The underflow is processed by plate pressing to form coal slurry, while the overflow is used as production water for recycling in the main washing workshop. The mud layer interface height and torque pressure are important control parameters in the thickening and settling process. The settling effect during thickening is closely related to the flocculant added to the coal slurry water. Excessive flocculant addition leads to rapid coal slurry settling, a low mud layer interface, increased underflow concentration, and increased thickener torque, potentially causing a "rake" accident. Insufficient flocculant addition results in poor coal slurry floc formation, poor coal slurry settling, a turbid mud layer, and a raised interface, causing the overflow water to fail to meet production requirements.

[0003] Because the coal slurry water treatment process is a process with a large lag and a large inertia, the coal slurry layer interface is difficult to detect accurately, and it has a complex nonlinear relationship with parameters such as torque, making it difficult to achieve operational control of flocculation and dosing for a long time.

[0004] Currently, the frequency setting of the flocculant dosing machine during the concentration and sedimentation process is still done manually. Every hour, the operator uses a transparent probe to obtain sedimentation data and manually adjusts the dosing pump frequency via the dosing machine's touchscreen to control the flocculation and sedimentation effect of the coal slurry. Because it is difficult for the operator to measure the mud layer interface in a timely manner to adjust the flocculant dosage, overdosing often results in high underflow concentration, high torque, and even "rake" problems; or underdosing results in "blackening" problems, making it difficult to guarantee the sedimentation effect, and the use of flocculants is unreasonable.

[0005] Therefore, how to solve the problems of untimely and unreasonable manual setting of flocculant dosing machine frequency in the existing concentration dosing process, reduce labor intensity, realize dynamic adjustment and automatic start and stop of flocculant dosing machine frequency setting, improve concentration and sedimentation effect, reduce chemical consumption, and reduce the incidence of accidents such as blackening and rake-down have become a hot research topic in the industry. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a parameter control method and system, storage medium and equipment for the coal slurry sedimentation process, which solves the technical problem of untimely and unreasonable manual setting of the flocculant dosing frequency during the coal slurry sedimentation concentration dosing process.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0010] In a first aspect, the present invention provides a parameter control method for a coal slurry settling process, comprising: starting a dosing pump based on an operating signal during the washing and beneficiation process, and determining an initial frequency setpoint for the dosing pump based on the coal type; collecting process data, including mud layer interface height data and rake torque and pressure data, and preprocessing the process data to obtain actual values ​​of the mud layer interface height and rake torque and pressure; adjusting the set mud layer interface height based on the actual values ​​of the rake torque and pressure under initial and normal operating conditions to obtain a set mud layer interface height value, wherein the initial operating condition is the condition within a preset time period after the operating signal is acquired; the normal operating condition is the condition where, after the initial operating condition ends, the mud layer interface height value and the rake torque and pressure value do not exceed a preset range; and controlling the start and stop of the dosing pump based on the actual values ​​of the mud layer interface height or the rake torque and pressure to restore the abnormal operating condition to the normal operating condition, wherein the abnormal operating condition is the condition where, after the initial operating condition ends, the mud layer interface height value or the rake torque and pressure value exceeds a preset range. Under both initial and normal operating conditions, the current set frequency of the dosing pump is adjusted based on the set value of the mud interface height, the actual value of the mud interface height, and the actual value of the rake torque pressure. Specifically, when the dosing pump is first started, its current set frequency is the initial set frequency value. The dosing pump is stopped based on a stop signal received during the washing and beneficiation process.

[0011] Optionally, the operating signal includes the actual value of the combined medium density, the start signal of the washing and screening equipment, or the start signal of the conveyor belt. The step of starting the dosing pump according to the operating signal in the washing and screening production process includes: starting the dosing pump when any combined medium density is greater than the density judgment threshold, or when the washing and screening equipment is turned on, or when the conveyor belt is turned on.

[0012] Optionally, determining the initial frequency setting value of the dosing pump based on the coal type includes: when the coal type is No. 32 coal, u sp (k) = e1. When the coal type is No. 52 coal, u sp (k) = e2. When the coal type is mixed coal, u sp (k) = e3. Where, u sp (k) is the initial frequency setting value of the dosing pump, and e1, e2, and e3 are empirical values.

[0013] Optionally, the preprocessing of the process data includes:

[0014] The time-series process data is subjected to first-order inertial filtering within a time window to obtain the filtered value. Within the time window, the process data is manually measured at n time points at equal intervals. The error between the manually measured value and the filtered value at each of the n time points is calculated, and the average error is used to compensate for the filtered value. The formula is as follows: Y(k)=αX(k)+(1-α)Y(k-1)+V(k), where α is the filtering coefficient, X(k) is the process data collected in this instance, Y(k-1) is the previous filtered output value, Y(k) is the current filtered output value, and V(k) is the average error. Ya(k) is the value measured manually in this study.

[0015] Optionally, adjusting the set mud interface height based on the actual value of the rake torque pressure under initial and normal operating conditions to obtain the set mud interface height includes: calculating the set mud interface height y according to the following formula. sp (k): y sp (k)=[y hsp (k)+y lsp (k)] / 2. In P pv When (k) > b1, y hsp (k)=P pv (k)+c1,y lsp (k)=P pv (k)-d1. In b2 < P pv When (k)≤b1, y hsp (k)=P pv (k)+c2,y lsp (k)=P pv (k)-d2. In P pv When (k)≤b2, y hsp (k)=P pv (k)+c3,y lsp (k)=P pv (k)-d3. Where P pv (k) represents the actual value of the rake's torque pressure, y hsp (k) represents the upper limit of the set value for the mud layer interface height, y lsp (k) is the lower limit of the mud layer interface height setting value, and b1, b2, c1, c2, c3, d1, d2, and d3 are empirical values.

[0016] Optionally, the step of controlling the start and stop of the dosing pump under abnormal operating conditions based on the actual value of the mud layer interface height or the actual value of the rake torque pressure, so as to restore the abnormal operating conditions to normal operating conditions, includes: in (Y pv (k)-Y sp (k))<-f4, and, Ppv If (k) > h6, stop the dosing pump. Or, if P pv If (k) > h7, stop the dosing pump. At P pv If (k) < h8, turn on the dosing pump. In (Y) pv (k)-Y sp (k))>f5, and Y pv Given that (k) > j1 for five minutes, determine whether P is true. pv (k) < h8. In P pv When (k) < h8, turn on the standby dosing pump and set its dosing frequency to 15Hz. In Y pv (k) < j2, or, P pv If (k) > h7, stop the dosing and standby pump. Here, f4, f5, h6, h7, h8, j1, and j2 are empirical values.

[0017] Optionally, adjusting the current set frequency value of the dosing pump under the initial operating conditions based on the set value of the mud layer interface height, the actual value of the mud layer interface height, and the actual value of the rake torque pressure includes: in |Y pv (k)-Y sp (k)|≤f1, and,us p When (k)≤g, Δu sp (k) = 0. In |Y pv (k)-Y sp (k)|≤f1, and, u sp When (k)>g, Δu sp (k) = -h′. In |Y pv (k)-Y sp (k)|>f1, and P pv When (k) < h1, Δu sp (k)=KP1[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI1(Y pv (k)-Y sp (k)). In |Y pv (k)-Y sp (k)|>f1, and P pv When (k)≤h2, Δu sp (k)=KP2[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI2(Ypv (k)-Y sp (k)). In |Y pv (k)-Y sp (k)|>f1, and P pv When (k)≥h2, Δu sp (k)=KP3[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI3(Y pv (k)-Y sp (k)). Adjust the current set frequency value of the dosing pump according to the following formula: u sp (k)=u sp (k-1)+Δu sp (k). Wherein, let the current time be k, Y pv (k) represents the actual height of the mud layer interface, Y sp (k) is the set value for the mud layer interface height, u sp (k) is the frequency setting value of the dosing pump, Δu sp (k) represents the change in the frequency setpoint, P pv (k) represents the actual value of the rake's torque pressure, f1, h1, h2, h', g, and KP. i KI i For empirical values, i = [1, 3].

[0018] Optionally, adjusting the current set frequency value of the dosing pump under normal operating conditions based on the set value of the mud layer interface height, the actual value of the mud layer interface height, and the actual value of the rake torque pressure includes: in |Y pv (k)-Y sp (k)|≤f1, and, u sp When (k)≤g, Δu sp (k) = 0. In |Y pv (k)-Y sp (k)|≤f1, and,us p (k)> g In the case of Δu sp (k) = -h′. In f1 < Y pv (k)-Y sp (k)≤f3, or -f2≤Y pv (k)-Y sp When (k) < -f1, Δu is determined based on the actual value of the rake torque pressure. sp (k). In f3 < Y pv (k)-Y spWhen (k)≤f5, Δu is determined based on the actual value of the rake's torque pressure. s p(k). In Y pv (k)-Y sp When (k) > f5, Δu is determined based on the actual value of the mud layer interface height and the actual value of the rake torque pressure. sp (k). In -f4≤Y pv (k)-Y sp When (k) < -f2, Δu is determined based on the actual value of the rake torque pressure. sp (k). In Y pv (k)-Y sp When (k) < -f4, Δu is determined based on the actual value of the rake torque pressure. sp (k). Adjust the current set frequency value of the dosing pump according to the following formula: u sp (k)=u sp (k-1)+Δu sp (k). Wherein, let the current time be k, Y pv (k) represents the actual height of the mud layer interface, Y sp (k) is the set value for the mud layer interface height, u sp (k) is the frequency setting value of the dosing pump, Δu sp (k) represents the change in the frequency setpoint, and f1, f2, f3, f4, f5, g, and h' are empirical values.

[0019] Optionally, the condition when f1 < Y pv (k)-Y sp (k)≤f3, or -f2≤Y pv (k)-Y sp When (k) < -f1, Δu is determined based on the actual value of the rake torque pressure. sp (k), including: in f1 < Y pv (k)-Y sp (k)≤f3, and, P pv When (k) < h3, Δu sp (k)=KP4[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI4(Y pv (k)-Y sp (k)). In -f2≤Y pv (k)-Y sp (k) < -f1, and, P pv When (k) < h3, Δu sp (k)=KP4[(Y pv (k)-Ysp (k))-(Y pv (k-1)-Y sp (k-1))]+KI4(Y pv (k)-Y sp (k)). In f1 < Y pv (k)-Y sp (k)≤f3, and h3≤P pv When (k)≤h4, Δu sp (k)=KP5[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI5(Y pv (k)-Y sp (k)). In -f2≤Y pv (k)-Y sp (k) < -f1, and h3 ≤ P pv When (k)≤h4, Δu sp (k)=KP5[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI5(Y pv (k)-Y sp (k)). In f1 < Y pv (k)-Y sp (k)≤f3, and h4<P pv In the case of (k), Δu sp (k)=KP6[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI6(Y pv (k)-Y sp (k)). In -f2≤Y pv (k)-Y sp (k) < -f1, and h4 < P pv In the case of (k), Δu sp (k)=KP6[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI6(Y pv (k)-Y sp (k)). Among them, P pv(k) represents the actual value of the rake torque pressure, h3 and h4 are empirical values, and KP i KI i For empirical values, i = [4, 6].

[0020] Optionally, the condition that f3 < Y pv (k)-Y sp When (k)≤f5, Δu is determined based on the actual value of the rake's torque pressure. sp (k), including: in f3 < Y pv (k)-Y sp (k)≤f5, and, P pv When (k) < h4, Δu sp (k)=KP7[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI7(Y pv (k)-Y sp (k)). In f3 < Y pv (k)-Y sp (k)≤f5, and, P pv When (k)≥h4, Δu sp (k)=KP8[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI8(Y pv (k)-Y sp (k)). Among them, KP7 and KI7 are empirical values.

[0021] Optionally, the statement in Y pv (k)-Y sp When (k) > f5, Δu is determined based on the actual value of the mud layer interface height and the actual value of the rake torque pressure. sp (k), including: in Y pv (k)-Y sp (k)>f5, and Y pv (k) < j1, and, P pv When (k) < h4, Δu sp (k)=KP9[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI9(Y pv (k)-Y sp (k)). In Y pv(k)-Y sp (k)>f5, and Y pv (k) < j1, and, P pv When (k)≥h4, Δu sp (k)=KP 10 [(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI 10 (Y pv (k)-Y sp (k)). In Y pv (k)-Y sp (k)>f5, and Y pv (k)≥j1, and, P pv When (k) < h4, Δu sp (k)=KP 11 [(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI 11 (Y pv (k)-Y sp (k)). In Y pv (k)-Y sp (k)>f5, and Y pv (k)≥j1, and, P pv When (k)≥h4, Δu sp (k)=KP 12 [(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI 12 (Y pv (k)-Y sp (k)). Where j1 is an empirical value, KP i KI i For empirical values, i = [9, 12].

[0022] Optionally, the condition -f4≤Y pv (k)-Y sp When (k) < -f2, Δu is determined based on the actual value of the rake torque pressure. sp (k), including: in -f4≤Y pv (k)-Y sp (k) < -f2, and, P pvWhen (k) < h3, Δu sp (k)=KP 13 [(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI 13 (Y pv (k)-Y sp (k)). In -f4≤Y pv (k)-Y sp (k) < -f2, and, P pv When (k)≥h3, Δu sp (k)=KP 14 [(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI 14 (Y pv (k)-Y sp (k)). Where KPi and KIi are empirical values, i = [13, 14].

[0023] Optionally, the statement in Y pv (k)-Y sp When (k) < -f4, Δu is determined based on the actual value of the rake torque pressure. sp (k), including: in Y pv (k)-Y sp (k) < -f4, and P pv When (k) < h3, Δu sp (k)=KP 15 [(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI 15 (Y pv (k)-Y sp (k)). In Y pv (k)-Y sp (k) < -f4, and h3 < P pv When (k) < h5, Δu sp (k)=KP 16 [(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI 16 (Ypv (k)-Y sp (k)). In Y pv (k)-Y sp (k) < -f4, and P pv When (k)>h5, Δu sp (k)=KP 17 [(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI 17 (Y pv (k)-Y sp (k)). Among them, h5, KPi, and KIi are empirical values, and i = [15, 17].

[0024] Optionally, the method further includes: according to KP i and KI i Limit the output amplitude of the set frequency value of the dosing pump:

[0025]

[0026] in, Set the maximum frequency for the dosing pump. Set the minimum frequency for the dosing pump, i = [1, 17].

[0027] Optionally, stopping the dosing pump based on a stop signal during the washing and beneficiation process includes stopping the dosing pump when all media densities are less than a density judgment threshold, or when the washing and beneficiation equipment stops, or when the conveyor belt stops.

[0028] Secondly, this invention provides a parameter control system for the coal slurry settling process, comprising: a start-up module, which starts a dosing pump based on the operating signal during the washing and beneficiation process and determines the initial frequency setpoint of the dosing pump according to the coal type; a data acquisition and processing module, which acquires process data, including mud layer interface height data and rake torque and pressure data, and preprocesses the process data to obtain the actual values ​​of the mud layer interface height and the rake torque and pressure; and a mud layer interface height adjustment module, which adjusts the set mud layer interface height based on the actual values ​​of the rake torque and pressure under initial and normal operating conditions to obtain the set mud layer interface height value. The initial operating condition is the condition within a preset time period after the operating signal is acquired. The normal operating condition is the condition where, after the initial operating condition ends, the mud layer interface height value and the rake torque and pressure value do not exceed a preset range. The anomaly handling module controls the start and stop of the dosing pump under abnormal operating conditions based on the actual value of the mud interface height or the actual value of the rake torque and pressure, so as to restore the abnormal operating conditions to normal operating conditions. The abnormal operating conditions are defined as the mud interface height or rake torque and pressure values ​​exceeding a preset range after the initial operating conditions have ended. The dosing pump frequency setting adjustment module adjusts the current set frequency value of the dosing pump based on the set mud interface height, the actual mud interface height, and the actual value of the rake torque and pressure under both initial and normal operating conditions. When the dosing pump is first started, the current set frequency value is the initial set frequency value. The stop module stops the dosing pump based on a stop signal during the washing and beneficiation process.

[0029] Thirdly, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the program, when executed, implements the parameter control method for the coal slurry water settling process as described in any one of the first aspects above.

[0030] Fourthly, the present invention provides a storage device, including a storage medium and a processor, wherein the storage medium stores a computer program, and when the program is executed by the processor, it implements the parameter control method for the coal slurry water settling process described in any one of the first aspects above.

[0031] (III) Beneficial Effects

[0032] The beneficial effects of this invention are as follows: This invention provides a parameter control method for the coal slurry sedimentation process. During the coal slurry thickening and sedimentation process, the start and stop of the dosing pump are controlled based on operating and stopping signals. Considering the changes in rake torque pressure and mud layer interface height, the mud layer interface height setpoint is adjusted based on the actual value of the rake torque pressure. Furthermore, the current set frequency of the dosing pump is adjusted based on the mud layer interface height setpoint, the actual value of the rake torque pressure, and the actual value of the mud layer interface height to control the amount of flocculant added to the coal slurry. This achieves dynamic adjustment and automatic start / stop of the flocculant dosing pump frequency during the thickening dosing process, enabling unattended and autonomous adjustment of the thickening dosing process. Compared to manual dosing, it improves the thickening and sedimentation effect, increases the pass rate of mud layer height ranges, reduces the incidence of "black run" (illegible material leakage) and rake-over accidents, and achieves the rational addition of flocculant. Attached Figure Description

[0033] Figure 1 A flowchart illustrating the parameter control method for the coal slurry water settling process provided in an embodiment of the present invention;

[0034] Figure 2 A schematic diagram showing the manual setting of the dosing pump frequency;

[0035] Figure 3 A graph showing the actual change in mud layer interface height when the dosing pump frequency is manually set.

[0036] Figure 4 A graph showing the frequency setpoint of the dosing pump in the parameter control method for the coal slurry settling process of the present invention.

[0037] Figure 5 This is a graph showing the actual change in mud layer interface height when the dosing pump frequency setting value of the present invention is used;

[0038] Figure 6 A block diagram of a parameter control system for the coal slurry settling process provided in an embodiment of the present invention.

[0039] [Explanation of Labels in the Attached Image]

[0040] 1: Actual value of mud layer interface height;

[0041] 2: Upper limit of mud layer interface height setting;

[0042] 3: Lower limit of mud layer interface height setting;

[0043] 600: Parameter control system for coal slurry water settling process;

[0044] 601: Startup module;

[0045] 602: Data acquisition and processing module;

[0046] 603: Mud layer interface height adjustment module;

[0047] 604: Exception handling module;

[0048] 605: Dosing pump frequency adjustment module;

[0049] 606: Stop module. Detailed Implementation

[0050] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] Due to the complexity of the coal slurry water system, the large fluctuations in the content of fine raw coal and the large fluctuations in the coal washing rate, as well as the instability of process equipment parameters, the coal slurry water system operates poorly, especially in the coal slurry water settling stage. Most coal preparation plants add polymeric flocculants to their coal slurry water treatment processes to accelerate the settling of coal slurry particles.

[0052] Because the coal slurry water treatment process is a process with a large lag and a large inertia, the coal slurry layer interface is difficult to detect accurately, and it has a complex nonlinear relationship with parameters such as torque, making it difficult to achieve operational control of flocculation and dosing for a long time.

[0053] Currently, the frequency setting of the flocculant dosing machine during the concentration and sedimentation process is still done manually. Operators use a transparent probe to observe the sedimentation process and then manually adjust the dosing pump frequency based on experience to control the flocculation and sedimentation effect of the coal slurry. Because operators cannot promptly measure the mud layer interface to adjust the flocculant dosage, problems often arise: excessive dosage leads to high underflow concentration and torque, potentially causing "rake" issues; or insufficient dosage causes "blackening" issues, making it difficult to guarantee sedimentation effectiveness and resulting in inappropriate flocculant use.

[0054] To address this complex industrial process, this invention proposes a parameter control method for the coal slurry sedimentation process, which intelligently sets the frequency of the automatic flocculant dosing pump. In this embodiment, the production conditions are automatically identified using the experience and knowledge of on-the-job workers. Combining expert experience with the domain knowledge base under different conditions, a cascade control approach is adopted. Based on the collected torque and pressure data of the rake, a set value for the mud layer interface height is obtained. Through intelligent switching between different controllers, using PI control and output limiting compensation, the current set frequency of the dosing pump is adjusted. Simultaneously, in abnormal operating conditions, the dosing pump automatically starts and stops, and alarms are triggered, ensuring rapid recovery from abnormal conditions to normal operating conditions.

[0055] The parameter control method for the coal slurry water settling process proposed in this invention achieves real-time dynamic adjustment and automatic start-stop of the flocculant dosing pump frequency during the concentration and dosing process by using operating condition identification, feedback information and rule reasoning.

[0056] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0057] Example:

[0058] Taking the coal slurry water treatment process of a coal preparation plant as an example, the coal slurry water separated at each stage enters the thickener through the feed pipe of the thickener. A dosing pump adds an appropriate amount of flocculant to the coal slurry water feed pipe of the thickener. The coal slurry particles in the slurry water settle and are concentrated under the action of the flocculant. After thickening by the thickener, the clarified water at the top overflows to the main washing workshop for recycling. The coal slurry deposited at the bottom of the thickener is pumped to the plate pressing workshop for further filtration by the underflow pump under the rotation of the rake. Information that can be monitored online includes: the torque and pressure of the thickener rake, and the height of the slurry interface.

[0059] Reference Figure 1 The first aspect of this invention provides a parameter control method for a coal slurry settling process, comprising:

[0060] S101, start the dosing pump according to the operating signal in the coal washing process, and determine the initial frequency setting value of the dosing pump according to the coal type.

[0061] S102, Collect process data, including mud layer interface height data and rake torque and pressure data, and preprocess the process data to obtain the actual values ​​of mud layer interface height and rake torque and pressure.

[0062] S103, under initial and normal operating conditions, adjusts the set mud layer interface height according to the actual value of the rake torque pressure to obtain the set mud layer interface height value.

[0063] The initial operating condition refers to the operating condition within a preset time after the operating signal is received. The normal operating condition refers to the operating condition where the mud layer interface height and the rake torque pressure value do not exceed the preset range after the initial operating condition ends.

[0064] S104, under abnormal working conditions, controls the start and stop of the dosing pump according to the actual value of the mud layer interface height or the actual value of the rake torque pressure, so as to restore the abnormal working conditions to normal working conditions.

[0065] Among them, abnormal working conditions are those in which the mud layer interface height or the rake torque pressure value exceeds the preset range after the initial working condition ends.

[0066] S105 adjusts the current set frequency value of the dosing pump based on the set value of the mud layer interface height, the actual value of the mud layer interface height, and the actual value of the rake torque pressure under both initial and normal operating conditions.

[0067] Specifically, when the dosing pump is first started, the current set frequency value of the dosing pump is the initial frequency set value of the dosing pump.

[0068] S106, stop the dosing pump according to the stop signal in the washing and beneficiation process.

[0069] This embodiment proposes a parameter control method for the coal slurry sedimentation process. During the coal slurry thickening and sedimentation process, the start and stop of the dosing pump are controlled based on operating and stopping signals. Considering the changes in rake torque pressure and mud layer interface height, the mud layer interface height setpoint is adjusted based on the actual value of the rake torque pressure. Furthermore, the current set frequency of the dosing pump is adjusted based on the mud layer interface height setpoint, the actual value of the rake torque pressure, and the actual value of the mud layer interface height to control the amount of flocculant added to the coal slurry. This achieves dynamic adjustment and automatic start / stop of the flocculant dosing pump frequency during the thickening dosing process, enabling unattended and autonomous adjustment of the thickening dosing process. Compared to manual dosing, this method improves the thickening and sedimentation effect, increases the pass rate of mud layer height ranges, reduces the incidence of "black runaway" and rake-over accidents, and achieves rational addition of flocculant.

[0070] Optionally, the operating signals include the actual value of the combined medium density, the start signal of the washing and screening equipment, or the start signal of the conveyor belt. The dosing pump is started according to the operating signals in the washing and screening production process, including: starting the dosing pump when any combined medium density is greater than the density judgment threshold, or when the washing and screening equipment is started, or when the conveyor belt is started.

[0071] The density judgment threshold is set to 1.4. Since there are multiple combined media densities (densities of qualified media) during the washing and screening process, the dosing pump needs to be turned on if any combined media density exceeds the density judgment threshold.

[0072] During the washing and screening process, each dosing machine has two dosing pumps. Due to uncertainties such as maintenance or malfunction of the dosing pumps, a manual selection is required when starting the dosing pump. If no selection is made, the dosing pump used before the last shutdown will be automatically started by default. The other pump serves as a backup dosing pump in case of abnormal operating conditions.

[0073] Optionally, the initial frequency setting of the dosing pump is determined according to the coal type, including: when the coal type is No. 32 coal, u sp (k) = e1. When the coal type is No. 52 coal, u sp (k) = e2. When the coal type is mixed coal, u sp (k) = e3. Where, u sp(k) is the initial frequency setting value of the dosing pump, and e1, e2, and e3 are empirical values.

[0074] Optionally, the coal type can be determined by feeding equipment or manually. Different coal types require different feeding equipment, thus allowing the coal type to be identified through the feeding equipment. Alternatively, the coal type can be determined by manually issuing signals.

[0075] Optionally, e1, e2, and e3 are 12Hz, 20Hz, and 14Hz, respectively.

[0076] Optionally, the process data is preprocessed, including:

[0077] The time-series process data is subjected to first-order inertial filtering within a time window to obtain the filtered value. Within the time window, the process data is manually measured at n time points at equal intervals. The error between the manually measured value and the filtered value at each of the n time points is calculated, and the average error is used to compensate for the filtered value. The formula is as follows: Y(k)=αX(k)+(1-α)Y(k-1)+V(k), where α is the filtering coefficient, X(k) is the process data collected in this instance, Y(k-1) is the previous filtered output value, Y(k) is the current filtered output value, and V(k) is the average error. Ya(k) is the value measured manually in this study.

[0078] Due to the burr phenomenon at the mud interface height caused by the rotation of the rake, the fluctuations in torque and pressure transmission, and the inherent errors of the instruments, the collected time-series data needs to be preprocessed to improve data reliability. Specifically, in the rake torque and pressure filtering process, α is set to 0.1; in the mud interface height filtering process, α is set to 0.01, and n is set to [5, 15], with n specifically set to 10.

[0079] Optionally, under initial and normal operating conditions, the set mud interface height is adjusted based on the actual value of the rake's torque pressure to obtain the set mud interface height value, including: calculating the set mud interface height value y according to the following formula. sp (k): y sp (k)=[y hsp (k)+y lsp (k)] / 2. In P pv When (k) > b1, y hsp (k)=P pv (k)+c1,y lsp (k)=P pv (k)-d1. In b2 < P pv When (k)≤b1, y hsp (k)=P pv(k)+c2,y lsp (k)=P pv (k)-d2. In P pv When (k)≤b2, y hsp (k)=P pv (k)+c3,y lsp (k)=P pv (k)-d3. Where P pv (k) represents the actual value of the rake's torque pressure, y hsp (k) represents the upper limit of the set value for the mud layer interface height, y lsp (k) is the lower limit of the mud layer interface height setting value, and b1, b2, c1, c2, c3, d1, d2, and d3 are empirical values.

[0080] The adjustment cycle for the mud layer interface height setting is 3 minutes. b1 and b2 are 2 and 1 respectively, and c1, c2, c3, d1, d2, and d3 are 0.2, 0.1, 0.2, 0.2, 0.3, and 0.1 respectively. Therefore, the mud layer interface height setting is determined based on the actual torque and pressure of the rake, and is adjusted promptly according to actual working conditions. This allows for adjustment of the flocculant dosage based on the actual mud layer interface height, thereby improving the flocculation and sedimentation effect.

[0081] Optionally, under abnormal operating conditions, the start and stop of the dosing pump are controlled according to the actual value of the mud layer interface height or the actual value of the rake torque pressure, so as to restore the abnormal operating conditions to normal operating conditions, including: in (Y pv (k)-Y sp (k))<-f4, and, P pv If (k) > h6, stop the dosing pump. Or, if P pv If (k) > h7, stop the dosing pump. At P pv If (k) < h8, turn on the dosing pump. In (Y) pv (k)-Y sp (k))>f5, and Y pv Given that (k) > j1 for five minutes, determine whether P is true. pv (k) < h8. In P pv When (k) < h8, turn on the standby dosing pump and set its dosing frequency to 15Hz. In Y pv (k) < j2, or, P pv If (k) > h7, stop the dosing and standby pump. Here, f4, f5, h6, h7, h8, j1, and j2 are empirical values.

[0082] f4, f5, h6, h7, h8, j1, and j2 are 0.3, 0.5, 2.4, 3.0, 2.5, 2.2, and 2.5, respectively. After the initial operating condition ends, if the fluctuations in torque pressure and mud layer height exceed a certain range, the condition is defined as an abnormal operating condition. This includes black mud accidents caused by poor flocculation and sedimentation leading to increased mud layer height, and rake accidents caused by excessive flocculation and sedimentation leading to increased torque pressure. Under these two abnormal operating conditions, a series of automatic processing actions are performed, including automatic start / stop and alarm of the corresponding dosing pumps, ensuring a rapid return to normal operating conditions. When the mud layer interface height deviation is less than the threshold -f4 and the torque pressure feedback is greater than the threshold h6, or the torque pressure feedback is greater than the threshold h7, it is judged that the pressure is too high and there is a risk of rake damage. At this time, the dosing pump currently dosing is stopped. After the bottom coal slime is treated in the filter press (plate press or pressurization) stage, when the torque pressure feedback is less than the safety threshold h8, the dosing pump that was stopped due to the abnormal operating condition is automatically restarted. Under normal operating conditions, when the mud layer interface height deviation exceeds the threshold f5 and the mud layer interface feedback exceeds the threshold j1, the software timing is activated. This timing avoids misjudgments caused by short-term mud layer fluctuations due to fluctuations in the incoming coal slurry or underflow (this situation can be eliminated quickly with appropriate dosing). If this condition is met for 5 minutes, the mud layer is considered too high. When the torque pressure feedback is less than the safety threshold h8, another dosing pump of the dosing machine is automatically started, and the dosing frequency is set. After the coal slurry flocculation and sedimentation effect improves, i.e., when the mud layer interface feedback is less than the threshold j2 or the torque pressure feedback is greater than the threshold h7, the dosing pump started due to abnormal operating conditions is automatically stopped.

[0083] Optionally, under initial operating conditions, the current set frequency value of the dosing pump is adjusted based on the set value of the mud interface height, the actual value of the mud interface height, and the actual value of the rake torque pressure, including: in |Y pv (k)-Y sp (k)|≤f1, and,us p When (k)≤g, Δu sp (k) = 0. In |Y pv (k)-Y sp (k)|≤f1, and,us p When (k)>g, Δu sp (k) = -h′. In |Y pv (k)-Y sp (k)|>f1, and P pv When (k) < h1, Δu sp (k)=KP1[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI1(Ypv (k)-Y sp (k)). In |Y pv (k)-Y sp (k)|>f1, and P pv When (k)≤h2, Δu sp (k)=KP2[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI2(Y pv (k)-Y sp (k)). In |Y pv (k)-Y sp (k)|>f1, and P pv When (k)≥h2, Δu sp (k)=KP3[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI3(Y pv (k)-Y sp (k)). Adjust the current set frequency value of the dosing pump according to the following formula: u sp (k)=u sp (k-1)+Δu sp (k). Wherein, let the current time be k, Y pv (k) represents the actual height of the mud layer interface, Y sp (k) is the set value for the mud layer interface height, u sp (k) is the frequency setting value of the dosing pump, Δu sp (k) represents the change in the frequency setpoint, P pv (k) represents the actual value of the rake torque pressure, and f1, h1, h2, h', g, KPi, and KIi are empirical values, i = [1, 3].

[0084] The values ​​of f1, h1, h2, h', g, KP1, KI1, KP2, KI2, KP3, and KI3 are 0.1, 1.0, 1.5, 0.2, 14.0, 1.0, 5.0, 1.0, 5.0, 1.0, and 5.0, respectively. The initial operating condition is within 40 minutes of the dosing pump being turned on. The adjustment cycle for the dosing pump frequency setting is 1 minute. When the absolute value of the mud interface height deviation is less than or equal to f1, and the delivery pump frequency setting is less than or equal to g, the current setting of the dosing pump remains unchanged. When the absolute value of the mud interface height deviation is less than or equal to f1, and the delivery pump frequency setting is greater than g, the current setting of the dosing pump is reduced to conserve pesticides. In other cases, the concentration effect is improved by adjusting the current setting of the dosing pump.

[0085] Optionally, under normal operating conditions, the current set frequency value of the dosing pump is adjusted based on the set value of the mud interface height, the actual value of the mud interface height, and the actual value of the rake torque pressure, including: in |Y pv (k)-Y sp (k)|≤f1, and, u sp (k)≤ g In the case of Δu sp (k) = 0. In |Y pv (k)-Y sp (k)|≤f1, and, u sp When (k)>g, Δu sp (k) = -h′. In f1 < Y pv (k)-Y sp (k)≤f3, or -f2≤Y pv (k)-Y sp When (k) < -f1, Δu is determined based on the actual value of the rake torque pressure. sp (k). In f3 < Y pv (k)-Y sp When (k)≤f5, Δu is determined based on the actual value of the rake's torque pressure. sp (k). In Y pv (k)-Y sp When (k) > f5, Δu is determined based on the actual value of the mud layer interface height and the actual value of the rake torque pressure. sp (k). In -f4≤Y pv (k)-Y sp When (k) < -f2, Δu is determined based on the actual value of the rake torque pressure. sp (k). In Y pv (k)-Y sp When (k) < -f4, Δu is determined based on the actual value of the rake torque pressure. sp(k). Adjust the current set frequency value of the dosing pump according to the following formula: u sp (k)=u sp (k-1)+Δu sp (k). Wherein, let the current time be k, Y pv (k) represents the actual height of the mud layer interface, Y sp (k) is the set value for the mud layer interface height, u sp (k) is the frequency setting value of the dosing pump, Δu sp (k) represents the change in the frequency setpoint, and f1, f2, f3, f4, f5, g, and h' are empirical values.

[0086] The values ​​for f1, f2, f3, f4, f5, g, and h' are 0.1, 0.2, 0.3, 0.3, 0.5, 14.0, and 0.2, respectively. The adjustment cycle for the dosing pump frequency setting is 1 minute. When the absolute value of the mud interface height deviation is less than or equal to f1, and the frequency setting of the delivery pump is less than or equal to g, the current setting of the dosing pump remains unchanged. When the absolute value of the mud interface height deviation is less than or equal to f1, and the frequency setting of the delivery pump is greater than g, the current setting of the dosing pump is reduced to conserve pesticides. In other cases, the concentration effect is improved by adjusting the current setting of the dosing pump.

[0087] Optionally, when f1 < Y pv (k)-Y sp (k)≤f3, or -f2≤Y pv (k)-Y sp When (k) < -f1, Δu is determined based on the actual value of the rake torque pressure. sp (k), including: in f1 < Y pv (k)-Y sp (k)≤f3, and, P pv When (k) < h3, Δu sp (k)=KP4[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI4(Y pv (k)-Y sp (k)). In -f2≤Y pv (k)-Y sp (k) < -f1, and, P pv When (k) < h3, Δu sp (k)=KP4[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp(k-1))]+KI4(Y pv (k)-Y sp (k)). In f1 < Y pv (k)-Y sp (k)≤f3, and h3≤P pv When (k)≤h4, Δu sp (k)=KP5[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI5(Y pv (k)-Y sp (k)). In -f2≤Y pv (k)-Y sp (k) < -f1, and h3 ≤ P pv When (k)≤h4, Δu sp (k)=KP5[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI5(Y pv (k)-Y sp (k)). In f1 < Y pv (k)-Y sp (k)≤f3, and h4<P pv In the case of (k), Δu sp (k)=KP6[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI6(Y pv (k)-Y sp (k)). In -f2≤Y pv (k)-Y sp (k) < -f1, and h4 < P pv In the case of (k), Δu sp (k)=KP6[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI6(Y pv (k)-Y sp (k)). Among them, P pv (k) represents the actual value of the rake torque pressure, h3 and h4 are empirical values, and KP i KI iFor empirical values, i = [4, 6].

[0088] Among them, h3 and h4 take values ​​of 1.0 and 2.0 respectively, and KP4, KI4, KP5, KI5, KP6, and KI6 take values ​​of 5.0, 1.0, 5.0, 1.0, 5.0, and 1.0 respectively.

[0089] Optionally, when f3 < Y pv (k)-Y sp When (k)≤f5, Δu is determined based on the actual value of the rake's torque pressure. sp (k), including: in f3 < Y pv (k)-Y sp (k)≤f5, and, P pv When (k) < h4, Δu sp (k)=KP7[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI7(Y pv (k)-Y sp (k)). In f3 < Y pv (k)-Y sp (k)≤f5, and, P pv When (k)≥h4, Δu sp (k)=KP8[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI8(Y pv (k)-Y sp (k)). Among them, KP7, KI7, KP8, and KI8 are empirical values.

[0090] The values ​​of KP7, KI7, KP8, and KI8 are 8.0, 0.4, 8.0, and 0.4, respectively.

[0091] Optionally, in Y pv (k)-Y sp When (k) > f5, Δu is determined based on the actual value of the mud layer interface height and the actual value of the rake torque pressure. sp (k), including: in Y pv (k)-Y sp (k)>f5, and Y pv (k) < j1, and, P pv When (k) < h4, Δu sp (k)=KP9[(Y pv (k)-Ysp (k))-(Y pv (k-1)-Y sp (k-1))]+KI9(Y pv (k)-Y sp (k)). In Y pv (k)-Y sp (k)>f5, and Y pv (k) < j1, and, P pv When (k)≥h4, Δu sp (k)=KP 10 [(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI 10 (Y pv (k)-Y sp (k)). In Y pv (k)-Y sp (k)>f5, and Y pv (k)≥j1, and, P pv When (k) < h4, Δu sp (k)=KP 11 [(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI 11 (Y pv (k)-Y sp (k)). In Y pv (k)-Y sp (k)>f5, and Y pv (k)≥j1, and, P pv When (k)≥h4, Δu sp (k)=KP 12 [(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI 12 (Y pv (k)-Y sp (k)). Where j1 is an empirical value, KPi and KIi are empirical values, and i = [9, 12].

[0092] j1, KP9, KI9, KP 10 KI 10 KP 11 KI11 KP 12 KI 12 The values ​​are 2.2, 10.0, 0.5, 10.0, 0.5, 10.0, 0.6, 10.0, and 0.6.

[0093] Optionally, when -f4≤Y pv (k)-Y sp When (k) < -f2, Δu is determined based on the actual value of the rake torque pressure. sp (k), including: in -f4≤Y pv (k)-Y sp (k) < -f2, and, P pv When (k) < h3, Δu sp (k)=KP 13 [(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI 13 (Y pv (k)-Ys p (k)). In -f4≤Y pv (k)-Y sp (k) < -f2, and, P pv When (k)≥h3, Δu sp (k)=KP 14 [(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI 14 (Y pv (k)-Y sp (k)). Where KPi and KIi are empirical values, i = [13, 14].

[0094] KP 13 KI 13 KP 14 KI 14 The values ​​are 5.0, 1.3, 5.0, and 1.3.

[0095] Optionally, in Y pv (k)-Y sp When (k) < -f4, Δu is determined based on the actual value of the rake torque pressure. sp (k), including: in Y pv (k)-Y sp (k) < -f4, and P pv When (k) < h3, Δusp (k)=KP 15 [(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI 15 (Y pv (k)-Y sp (k)). In Y pv (k)-Y sp (k) < -f4, and h3 < P pv When (k) < h5, Δu sp (k)=KP 16 [(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI 16 (Y pv (k)-Y sp (k)). In Y pv (k)-Y sp (k) < -f4, and P pv When (k)>h5, Δu sp (k)=KP 17 [(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI 17 (Y pv (k)-Y sp (k)). Among them, h5 and KP i KI i For empirical values, i = [15, 17].

[0096] h5, KP 15 KI 15 KP 16 KI 16 KP 17 KI 17 The values ​​are 1.6, 5.0, 1.2, 5.0, 1.2, 5.0, and 2.0.

[0097] Optionally, the method also includes: based on KP i and KI i Limit the output amplitude of the set frequency value of the dosing pump:

[0098]

[0099] in, The maximum frequency was set for the dosing pump, with the following values ​​in sequence: 19.0, 17.0, 14.0, 22.0, 22.0, 18.0, 24.0, 18.0, 25.0, 18.0, 26.0, 18.0, 15.0, 15.0, 13.0, 13.0, and 9.0. Set the minimum frequency for the dosing pump, and take the values ​​10.0, 8.0, 6.0, 12.0, 12.0, 6.0, 15.0, 8.0, 17.0, 10.0, 19.0, 12.0, 9.0, 6.0, 8.0, 6.0, 3.0 in sequence, i = [1, 17].

[0100] By limiting the set frequency value of the dosing pump, it is possible to avoid the frequency setting being too high or too low during the adjustment of the dosing pump frequency, thus ensuring the normal operation of the coal slurry concentration and sedimentation process.

[0101] Optionally, the dosing pump may be stopped based on a stop signal during the washing and beneficiation process, including: stopping the dosing pump when all media densities are less than the density judgment threshold, or when the washing and beneficiation equipment stops, or when the conveyor belt stops.

[0102] The density judgment threshold is set to 1.4. Since there are multiple combined media densities (densities of qualified media) during the washing and screening process, the dosing pump can only be stopped when all combined media densities are less than the density judgment threshold.

[0103] like Figure 2 The image shows the manually set dosing pump frequency, such as... Figure 3 The figure shows the actual value variation curve of the mud layer interface height when the dosing pump frequency is manually set. It is clear from the figure that, with the manually set dosing pump frequency, the actual value 1 of the mud layer interface height fluctuates too much and is unstable, limited by the upper limit 2 and the lower limit 3 of the mud layer interface height setting. Figure 4 As shown, this is the frequency setpoint curve of the dosing pump using the parameter control method for the coal slurry settling process of the present invention. Figure 5The figure shows the actual value variation curve of the mud layer interface height when using the dosing pump frequency setting value of the present invention. It is clear from the figure that by manually setting the dosing pump frequency, the actual value 1 of the mud layer interface height can be well controlled within the range of the upper limit 2 and the lower limit 3 of the mud layer interface height setting value. Compared with the effect of manual setting, the parameter control method of the coal slurry water settling process of the present invention can adjust the flocculant dosing pump frequency in a timely manner to adapt to changes in complex working conditions, and control the mud layer height better within the reference range. The interval qualification rate is increased by 13.14% compared with manual setting, and the flocculant consumption per ton of raw coal is reduced by 0.5%. This effectively ensures the quality of the mud layer height (i.e., the circulating water), saves the production water added during the process, improves the settling effect, ensures continuous production, and reduces the incidence of rake accidents. It achieves precise dosing and rational use of chemicals, and reduces labor intensity.

[0104] Second aspect of the embodiment, such as Figure 6As shown, this invention provides a parameter control system 600 for the coal slurry settling process, including: a start-up module 601, a data acquisition and processing module 602, a mud layer interface height adjustment module 603, an anomaly handling module 604, a dosing pump set frequency adjustment module 605, and a stop module 606. The start-up module 601 starts the dosing pump based on the operating signals during the washing and beneficiation process and determines the initial frequency set value of the dosing pump according to the coal type. The data acquisition and processing module 602 acquires process data, including mud layer interface height data and rake torque and pressure data, and preprocesses the process data to obtain the actual values ​​of the mud layer interface height and rake torque and pressure. The mud layer interface height adjustment module 603 adjusts the set mud layer interface height based on the actual values ​​of the rake torque and pressure under initial and normal operating conditions to obtain the set mud layer interface height value. The initial operating condition is the condition within a preset time after the operating signal is acquired. The normal operating condition is the condition where the mud layer interface height value and the rake torque and pressure value do not exceed a preset range after the initial operating condition ends. The abnormality handling module 604 controls the start and stop of the dosing pump under abnormal operating conditions based on the actual value of the mud layer interface height or the actual value of the rake torque pressure, so as to restore the abnormal operating conditions to normal operating conditions. The abnormal operating condition is defined as the condition where, after the initial operating condition ends, the mud layer interface height or the rake torque pressure exceeds a preset range. The dosing pump frequency setting adjustment module 605 adjusts the current set frequency value of the dosing pump based on the set value of the mud layer interface height, the actual value of the mud layer interface height, and the actual value of the rake torque pressure under both the initial and normal operating conditions. When the dosing pump is first started, the current set frequency value is the initial set frequency value. The stop module 606 stops the dosing pump based on a stop signal during the washing and beneficiation process. The parameter control system for the coal slurry settling process provided by the technical solution of the present invention, since it is used to implement the steps of the parameter control method for the coal slurry settling process provided in the first aspect of the present invention, possesses all the technical effects of the parameter control method for the coal slurry settling process, which will not be elaborated further here.

[0105] In a third aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the program, when executed, implements a parameter control method for the coal slurry water settling process of any of the first aspects described above.

[0106] In a fourth aspect, the present invention provides a storage device, including a storage medium and a processor, wherein the storage medium stores a computer program, and when the program is executed by the processor, it implements the parameter control method for the coal slurry settling process of any one of the first aspects described above.

[0107] In addition, in order to realize the parameter control method of the above-mentioned coal slurry water settling process, this embodiment also provides a control system for the coal slurry water concentration and dosing process that implements the above-mentioned control method. The control system may include: multiple detection devices and control devices.

[0108] The first detection device is used to detect the torque and pressure information of the rake in different thickeners. The first detection device can be a pressure gauge. The first detection device is located in the central area of ​​the thickener.

[0109] The second detection device is used to detect the height of the sludge interface in the thickener. This second detection device can be a sludge interface meter, with a minimum detection cycle of 10 seconds. The second detection device also needs to be installed in the central area of ​​the thickener.

[0110] The control program is deployed in the newly added Rockwell PLC. The flocculant preparation and delivery system can use Siemens' S7-200 system, and data communication between the flocculant preparation and delivery system and the new Rockwell PLC is achieved using Profibus DP communication. Two sludge interface height detection devices are used to measure the sludge interface height in the thickener, acquire the torque and flocculant flow rate measurement signals in the thickener, and connect them to the control system.

[0111] The control system's process control software and process monitoring software utilize Studio5000 and RSview32, respectively. Intelligent dosing control software and intelligent dosing monitoring software for the concentration and sedimentation process were developed on these software platforms.

[0112] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0113] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, then this invention should also include these modifications and variations.

[0114] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A parameter control method for a coal slurry water settling process, characterized in that, include: The dosing pump is started according to the operating signals in the coal washing and beneficiation process, and the initial frequency setting value of the dosing pump is determined according to the coal type. Collect process data, including mud layer interface height data and rake torque and pressure data. Preprocess the process data to obtain the actual values ​​of mud layer interface height and rake torque and pressure. Under the initial and normal operating conditions, the set mud layer interface height is adjusted according to the actual value of the rake torque and pressure to obtain the set value of the mud layer interface height. The initial operating condition is the operating condition within a preset time after the operation signal is obtained; the normal operating condition is the operating condition where the mud layer interface height value and the rake torque and pressure value do not exceed the preset range after the initial operating condition ends. Under abnormal operating conditions, the start and stop of the dosing pump are controlled according to the actual value of the mud layer interface height or the actual value of the rake torque pressure, so as to restore the abnormal operating conditions to normal operating conditions. The abnormal operating conditions are those in which the mud layer interface height or the rake torque pressure exceeds the preset range after the initial operating conditions are completed. Under both initial and normal operating conditions, the current set frequency value of the dosing pump is adjusted based on the set value of the mud layer interface height, the actual value of the mud layer interface height, and the actual value of the rake torque pressure. Specifically, when the dosing pump is just started, the current set frequency value of the dosing pump is the initial set frequency value of the dosing pump. The dosing pump is stopped according to the stop signal during the washing and screening process.

2. The parameter control method for the coal slurry water settling process according to claim 1, characterized in that, The operating signals include the actual value of the mixed density, the start signal of the washing and beneficiation equipment, or the start signal of the conveyor belt. Starting the dosing pump based on the operating signals during the washing and beneficiation process includes: The dosing pump is started when any of the media densities exceeds the density threshold, or when the washing and screening equipment is turned on, or when the conveyor belt is turned on.

3. The parameter control method for the coal slurry water settling process according to claim 1, characterized in that, The determination of the initial frequency setting value of the dosing pump based on the coal type includes: When the coal type is No. 32 coal, u sp (k) = e1; When the coal type is No. 52 coal, u sp (k) = e2; When the coal type is mixed coal, u sp (k) = e3; Among them, u sp (k) is the initial frequency setting value of the dosing pump, and e1, e2, and e3 are empirical values.

4. The parameter control method for the coal slurry water settling process according to claim 1, characterized in that, The preprocessing of process data includes: The time series process data is subjected to first-order inertial filtering within a time window to obtain the filtered value; Within a time window, process data is manually measured at n time points at equal time intervals. The error between the manually measured values ​​and the filtered values ​​at the n time points is calculated, and the average error is used to compensate for the filtered values. The formula is as follows: Y(k)=αX(k)+(1-α)Y(k-1)+V(k) Where α is the filter coefficient, X(k) is the process data collected in this instance, Y(k-1) is the previous filter output value, Y(k) is the current filter output value, and V(k) is the average error value. Ya(k) is the value measured manually in this study.

5. The parameter control method for the coal slurry water settling process according to claim 1, characterized in that, The process of adjusting the set mud layer interface height based on the actual value of the rake's torque and pressure under initial and normal operating conditions to obtain the set mud layer interface height includes: The set value of mud layer interface height y is calculated using the following formula. sp (k): y sp (k)=[y hsp (k)+y lsp (k)] / 2; In P pv When (k)>b1, y hsp (k)=P pv (k)+c1,y lsp (k)=P pv (k)-d1; In B2 <P pv When (k)≤b1, y hsp (k)=P pv (k)+c2,y lsp (k)=P pv (k)-d2; In P pv When (k)≤b2, y hsp (k)=P pv (k)+c3,y lsp (k)=P pv (k)-d3; Among them, P pv (k) represents the actual value of the rake's torque pressure, y hsp (k) represents the upper limit of the set value for the mud layer interface height, y lsp (k) is the lower limit of the mud layer interface height setting value, and b1, b2, c1, c2, c3, d1, d2, and d3 are empirical values.

6. The parameter control method for the coal slurry water settling process according to claim 1, characterized in that, The method of controlling the start and stop of the dosing pump under abnormal operating conditions based on the actual value of the mud layer interface height or the actual value of the rake torque pressure, so as to restore the abnormal operating conditions to normal operating conditions, includes: In (Y) pv (k)-Y sp (k))<-f4, and, P pv If (k)>h6, stop the dosing pump; or, in case P pv If (k)>h7, stop the dosing pump; At P pv (k) When <h8, start the chemical dosing pump; In (Y) pv (k)-Y sp (k))>f5, and Y pv Given that (k)>j1 lasts for five minutes, determine whether P is true. pv (k) <h8; At P pv (k) When <h8, start the standby chemical dosing pump and set the chemical dosing frequency of the standby chemical dosing pump to 15 Hz; At Y pv (k) < j2, or, P pv When (k) > h7, stop the standby chemical dosing pump; Among them, f4, f5, h6, h7, h8, j1, and j2 are empirical values.

7. The parameter control method for the coal slurry water settling process according to claim 1, characterized in that, The adjustment of the current set frequency value of the dosing pump under the initial operating conditions, based on the set value of the mud layer interface height, the actual value of the mud layer interface height, and the actual value of the rake torque pressure, includes: In |Y pv (k)-Y sp (k)|≤f1, and, u sp When (k)≤g, Δu sp (k) = 0; In |Y pv (k)-Y sp (k)|≤f1, and, u sp When (k)>g, Δu sp (k) = -h′; At |Y pv (k)-Y sp (k)| > f1, and, P pv (k) < h1, in this case, Δu sp (k) = KP1[(Y pv (k)-Y sp (k))-(Y pv (k - 1)-Y sp (k - 1))]+KI1(Y pv (k)-Y sp (k)); In |Y pv (k)-Y sp (k)|>f1, and P pv When (k)≤h2, Δu sp (k)=KP2[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI2(Y pv (k)-Y sp (k)); In |Y pv (k)-Y sp (k)|>f1, and P pv When (k)≥h2, Δu sp (k)=KP3[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI3(Y pv (k)-Y sp (k)); Adjust the current set frequency value of the dosing pump according to the following formula: u sp (k)=u sp (k-1)+Δu sp (k); Let the current time be k, Y pv (k) represents the actual height of the mud layer interface, Y sp (k) is the set value for the mud layer interface height, u sp (k) is the frequency setting value of the dosing pump, Δu sp (k) represents the change in the frequency setpoint, P pv (k) represents the actual value of the rake's torque pressure, f1, h1, h2, h', g, and KP. i KI i For empirical values, i = [1, 3].

8. The parameter control method for the coal slurry water settling process according to claim 7, characterized in that, Under normal operating conditions, the current set frequency value of the dosing pump is adjusted based on the set value of the mud layer interface height, the actual value of the mud layer interface height, and the actual value of the rake torque pressure, including: In |Y pv (k)-Y sp (k)|≤f1, and, u sp When (k)≤g, Δu sp (k) = 0; In |Y pv (k)-Y sp (k)|≤f1, and, u sp When (k)>g, Δu sp (k) = -h′; In F1 <Y pv (k)-Y sp (k)≤f3, or -f2≤Y pv (k)-Y sp When (k) < -f1, Δu is determined based on the actual value of the rake's torque and pressure. sp (k); In F3 <Y pv (k)-Y sp When (k)≤f5, Δu is determined based on the actual value of the rake's torque pressure. sp (k); In Y pv (k)-Y sp When (k)>f5, Δu is determined based on the actual value of the mud layer interface height and the actual value of the rake torque pressure. sp (k); In -f4≤Y pv (k)-Y sp When (k) < -f2, Δu is determined based on the actual value of the rake's torque and pressure. sp (k); In Y pv (k)-U sp When (k) < -f4, Δu is determined based on the actual value of the rake's torque and pressure. sp (k); Adjust the current set frequency value of the dosing pump according to the following formula: u sp (k)=u sp (k-1)+Δu sp (k); Let the current time be k, Y pv (k) represents the actual height of the mud layer interface, Y sp (k) is the set value for the mud layer interface height, u sp (k) is the frequency setting value of the dosing pump, Δu sp (k) represents the change in the frequency setpoint, and f1, f2, f3, f4, f5, g, and h' are empirical values.

9. The parameter control method for the coal slurry water settling process according to claim 8, characterized in that, The above in f1 <Y pv (k)-Y sp (k)≤f3, or -f2≤Y pv (k)-Y sp When (k) < -f1, Δu is determined based on the actual value of the rake's torque and pressure. sp (k), including: When f1 < Y pv (k) - Y sp (k) ≤ f3, and, P pv (k) < h3, in this case, Δu sp (k) = KP4[(Y pv (k) - Y sp (k)) - (Y pv (k - 1) - Y sp (k - 1))] + KI4(Y pv (k) - Y sp (k)); When -f2 ≤ Y pv (k) - Y sp (k) < -f1, and, P pv (k) < h3, then Δu sp (k) = KP4[(Y pv (k) - Y sp (k)) - (Y pv (k - 1) - Y sp (k - 1))] + KI4(Y pv (k) - Y sp (k)); In F1 <Y pv (k)-Y sp (k)≤f3, and h3≤P pv When (k)≤h4, Δu sp (k)=KP5[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI5(Y pv (k)-Y sp (k)); In -f2≤Y pv (k)-Y sp (k) < -f1, and h3 ≤ P pv When (k)≤h4, Δu sp (k)=KP5[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI5(Y pv (k)-Y sp (k)); In F1 <Y pv (k)-Y sp (k)≤f3, and h4 <P pv In the case of (k), Δu sp (k)=KP6[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI6(Y pv (k)-Y sp (k)); In -f2≤Y pv (k)-Y sp (k) < -f1, and h4 <P pv In the case of (k), Δu sp (k)=KP6[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI6(Y pv (k)-Y sp (k)); Among them, P pv (k) represents the actual value of the rake torque pressure, h3 and h4 are empirical values, and KP i KI i For empirical values, i = [4, 6].

10. The parameter control method for the coal slurry water settling process according to claim 9, characterized in that, The above in f3 <Y pv (k)-Y sp When (k)≤f5, Δu is determined based on the actual value of the rake's torque pressure. sp (k), including: When f3 < Y pv (k) - Y sp (k) ≤ f5, and, P pv (k) < h4, then Δu sp (k) = KP7[(Y pv (k) - Y sp (k)) - (Y pv (k - 1) - Y sp (k - 1))] + KI7(Y pv (k) - Y sp (k)); In F3 <Y pv (k)-Y sp (k)≤f5, and, P pv When (k)≥h4, Δu sp (k)=KP8[(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI8(Y pv (k)-Y sp (k)); Among them, KP7 and KI7 are experience values.

11. The parameter control method for the coal slurry water settling process according to claim 10, characterized in that, The in Y pv (k)-Y sp When (k)>f5, Δu is determined based on the actual value of the mud layer interface height and the actual value of the rake torque pressure. sp (k), including: At Y pv (k) - Y sp (k) > f5, and, Y pv (k) < j1, and, P pv (k) < h4, in this case, Δu sp (k) = KP9[(Y pv (k) - Y sp (k)) - (Y pv (k - 1) - Y sp (k - 1))] + KI9(Y pv (k) - Y sp (k)); At Y pv (k)-Y sp (k)>f5, and, Y pc (k)<j1, and, P pc (k)≥h4, in this case, Δu sp (k)=KP 10 [(Y pv (k)-Y sp (k))-(Y pv (k - 1)-Y sp (k - 1))]+KI 10 (Y pv (k)-Y sp (k)); at Y pv (k)-Y sp (k)>f5, and, Y pv (k)≥j1, and, P pv (k)<h4, the case of, Δu sp (k)=KP 11 [(Y pv (k)-Y sp (k))-(Y pv (k - 1)-Y sp (k - 1))]+KI 11 (Y pv (k)-Y sp (k)); In Y pv (k)-Y sp (k)>f5, and Y pv (k)≥j1, and, P pv When (k)≥h4, Δu sp (k)=KP 12 [(Y pc (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI 12 (Y pc (k)-Y sp (k)); Where j1 is the empirical value, KP i KI i For empirical values, i = [9, 12].

12. The parameter control method for the coal slurry water settling process according to claim 11, characterized in that, The condition -f4≤Y pv (k)-Y sp When (k) < -f2, Δu is determined based on the actual value of the rake's torque and pressure. sp (k), including: when -f4 ≤ Y pv (k) - Y sp (k) < -f2, and, P pc (k) < h3, then Δu sp (k) = KP 13 [(Y pv (k) - Y sp (k)) - (Y pv (k - 1) - Y sp (k - 1))] + KI 13 (Y pv (k) - Y sp (k)); In -f4≤Y pv (k)-Y sp (k) < -f2, and P pv When (k)≥h3, Δu sp (k)=KP 14 [(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI 14 (Y pv (k)-Y sp (k)); Among them, KP i KI i For empirical values, i = [13, 14].

13. The parameter control method for the coal slurry water settling process according to claim 12, characterized in that, The in Y pv (k)-Y sp When (k) < -f4, Δu is determined based on the actual value of the rake's torque and pressure. sp (k), including: At Y pv (k)-Y sp (k)<-f4, and, P pv (k)<h3, in the case of, Δu sp (k) = KP 15 [(Y pv (k)-Y sp (k))-(Y pv (k - 1)-Y sp (k - 1))]+KI 15 (Y pv (k)-Y sp (k)); At Y pv (k) - Y sp (k) < -f4, and, h3 < P pv When (k) < h5, Δu sp (k) = KP 16 [(Y pv (k) - Y sp (k)) - (Y pv (k - 1) - Y sp (k - 1))] + KI 16 (Y pv (k) - Y sp (k)); In Y pv (k)-Y sp (k) < -f4, and P pv When (k)>h5, Δu sp (k)=KP 17 [(Y pv (k)-Y sp (k))-(Y pv (k-1)-Y sp (k-1))]+KI 17 (Y pv (k)-Y sp (k)); Among them, h5, KP i KI i For empirical values, i = [15, 17].

14. The parameter control method for the coal slurry water settling process according to claim 13, characterized in that, The method further includes: According to KP i and KI i Limit the output amplitude of the set frequency value of the dosing pump: in, Set the maximum frequency for the dosing pump. Set the minimum frequency for the dosing pump, i = [1, 17].

15. The parameter control method for the coal slurry water settling process according to claim 1, characterized in that, The step of stopping the dosing pump based on a stop signal during the washing and beneficiation process includes: Stop the dosing pump if all media densities are below the density threshold, or if the washing and screening equipment stops, or if the conveyor belt stops.

16. A parameter control system for a coal slurry settling process, characterized in that, include: The start-up module activates the dosing pump based on the operating signals during the washing and beneficiation process, and determines the initial frequency setting value of the dosing pump according to the type of coal. The data acquisition and processing module collects process data, including mud interface height data and rake torque and pressure data. It preprocesses the process data to obtain the actual values ​​of mud interface height and rake torque and pressure. The mud layer interface height adjustment module adjusts the set mud layer interface height according to the actual value of the rake torque and pressure under the initial working condition and normal working condition to obtain the set value of the mud layer interface height. The initial working condition is the working condition within a preset time after the operation signal is obtained; the normal working condition is the working condition after the initial working condition ends, where the mud layer interface height value and the rake torque and pressure value do not exceed the preset range. The abnormality handling module controls the start and stop of the dosing pump based on the actual value of the mud layer interface height or the actual value of the rake torque and pressure under abnormal working conditions, so as to restore the abnormal working conditions to normal working conditions. The abnormal working conditions are those in which the mud layer interface height or the rake torque and pressure exceeds the preset range after the initial working conditions end. The dosing pump frequency adjustment module adjusts the current set frequency value of the dosing pump under both initial and normal operating conditions, based on the set value of the mud interface height, the actual value of the mud interface height, and the actual value of the rake torque pressure. Specifically, when the dosing pump is just started, the current set frequency value of the dosing pump is the initial frequency set value of the dosing pump. The stop module stops the dosing pump based on the stop signal during the washing and beneficiation process.

17. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the parameter control method for the coal slurry water settling process as described in any one of claims 1 to 15.

18. A storage device comprising a storage medium and a processor, the storage medium storing a computer program, characterized in that, When the processor executes the computer program, it implements the parameter control method for the coal slurry water settling process as described in any one of claims 1 to 15.

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