Control system and method of enhanced grading cyclone

Abstract

The invention discloses a control system and method for an enhanced classification cyclone in the technical field of coal slime separation. The control method comprises the steps that the overflow product granularity of a fine-fraction feeding buffer box and the overflow product granularity of the cyclone are obtained; the particle sizes of the overflow products of the fine-fraction feeding buffer tank and the cyclone are compared with a preset overflow product particle size threshold value, and a particle size comparison result is obtained; on-off adjustment is conducted on a feeding pump and an adjusting valve of the cyclone based on the particle size comparison result; on the basis of the adjusted states of the feeding pump and the adjusting valve, the pressure value of the cyclone is obtained, and the motor frequency of the feeding pump and the opening degree of the adjusting valve are adjusted on the basis of the pressure value of the cyclone; and the adjusted cyclone overflow product granularity is obtained and compared with a preset overflow product granularity threshold value. According to the invention, automatic adjustment of density and pressure in the cyclone is realized, the operation difficulty of personnel is reduced, accurate classification is realized, the phenomenon of'coarse particles' caused by mixing of overflow products of the cyclone into coarse particles is avoided, and the effect of the cyclone is improved.

Description

Technical Field

[0001] The present invention relates to a control system and method for an enhanced classification hydrocyclone, belonging to the technical field of coal slime separation. Background Technique

[0002] As the main mineral resource in China, in recent years, the research on coal washing process technology has paid more attention to improving the separation and flotation efficiency of coal slime. Among them, the separation of coarse coal slime is one of the particularly important links in coal preparation plants. The commonly used coal slime separation equipment in coal preparation plants is a hydrocyclone. A hydrocyclone is a classification operation device based on the basic principle of centrifugal sedimentation, and realizes the classification of particles in the pulp by means of the centrifugal field generated by the high-speed swirl inside it. Under the action of pressure, the pulp enters the cylindrical end of the hydrocyclone from the tangential feed port height, forming an outer swirl and an inner swirl. The tangential inlet ensures that the fluid has sufficient rotational speed to generate centrifugal force. Larger particles are more affected by the centrifugal force and are thrown towards the wall, moving downward along the outer swirl and finally discharged through the underflow port. Smaller particles are less affected by the centrifugal force and move upward along the inner swirl and are discharged from the overflow port. In the actual production process, the classification efficiency and particle size distribution are adjusted by adjusting the feed pressure and the ratio of the underflow port to the overflow port.

[0003] As the core separation and classification equipment in coal preparation plants, the performance of hydrocyclones directly affects the clean coal yield, product quality and resource utilization rate. However, in recent years, during the intelligent construction of coal preparation plants, the control of the hydrocyclone production process is not fine. Some coal preparation plants still rely too much on manual control for parameter adjustment of hydrocyclones, resulting in poor real-time performance of parameter adjustment and inability to meet the requirements of precise separation. The deficiencies existing in the current production process are as follows: In practical applications, the adjustment of the density and pressure inside the hydrocyclone is achieved by manually controlling the frequency of the feed variable-frequency pump. The operation difficulty for personnel is large and the labor intensity is high. Moreover, due to the lack of an intelligent control system and a large range of particle size changes, the hydrocyclone cannot achieve precise classification. The coupling of the above multiple factors leads to the mixing of coarse particles in the hydrocyclone overflow product, resulting in the phenomenon of "coarse particle running", affecting the hydrocyclone effect, further leading to unstable production process and deterioration of production indicators. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a control system and method for an enhanced classification hydrocyclone, which realizes the automatic adjustment of the density and pressure inside the hydrocyclone, reduces the operation difficulty for personnel, achieves precise classification, avoids the mixing of coarse particles in the hydrocyclone overflow product resulting in the "coarse particle running" phenomenon, and improves the hydrocyclone effect.

[0005] To achieve the above purpose, the present invention is implemented by adopting the following technical solutions: In the first aspect, the present invention provides a control method for an enhanced classification hydrocyclone, including: Obtain the particle size of the overflow product of the fine-grained feed buffer tank and the hydrocyclone; Compare the particle size of the overflow product of the fine-grained feed buffer tank and the hydrocyclone with a preset overflow product particle size threshold to obtain a particle size comparison result; Based on the particle size comparison result, perform on-off adjustment on the feed pump and regulating valve of the hydrocyclone; Based on the adjusted states of the feed pump and regulating valve, obtain the hydrocyclone pressure value, and adjust the motor frequency of the feed pump and the opening degree of the regulating valve based on the hydrocyclone pressure value; Obtain the particle size of the hydrocyclone overflow product after adjustment and compare it with the preset overflow product particle size threshold. When the comparison result meets the particle size requirement, do not perform on-off adjustment on the feed pump and regulating valve of the hydrocyclone, otherwise, re-perform on-off adjustment on the feed pump and regulating valve of the hydrocyclone based on the particle size comparison result.

[0006] Further, the particle size comparison result includes: d2 < d1 < a d2 < a < d1 < b a < d2 < d1 < b a < d2 < b < d1 d2 < d1 < a < b Where: d2 is the particle size of the pulp entering the fine-grained feed buffer tank, d1 is the particle size of the pulp entering the second-stage hydrocyclone, and a and b are the upper and lower particle size threshold values respectively.

[0007] Further, performing on-off adjustment on the feed pump and regulating valve of the hydrocyclone based on the particle size comparison result includes: In response to d2 < d1 < a, control to turn on the feed pump of the first-stage hydrocyclone, turn off the reflux pump of the second-stage hydrocyclone, turn off the reflux regulating valve of the first-stage hydrocyclone, and turn off the reflux regulating valve of the second-stage hydrocyclone; In response to d2 < a < d1 < b, control to turn on the feed pump of the first-stage hydrocyclone, turn off the reflux pump of the second-stage hydrocyclone, turn on the reflux regulating valve of the first-stage hydrocyclone, and turn off the reflux regulating valve of the second-stage hydrocyclone; In response to a < d2 < d1 < b, control to turn on the feed pump of the first-stage hydrocyclone, turn on the reflux pump of the second-stage hydrocyclone, turn on the reflux regulating valve of the first-stage hydrocyclone, and turn off the reflux regulating valve of the second-stage hydrocyclone; In response to a < d2 < b < d1 or d2 < d1 < a < b, control to turn on the feed pump of the first-stage hydrocyclone, turn on the reflux pump of the second-stage hydrocyclone, turn on the reflux regulating valve of the first-stage hydrocyclone, and turn on the reflux regulating valve of the second-stage hydrocyclone.

[0008] Further, obtaining the hydrocyclone pressure value based on the adjusted states of the feed pump and regulating valve, and adjusting the motor frequency of the feed pump and the opening degree of the regulating valve based on the hydrocyclone pressure value includes: When the feed pump of the first-stage cyclone is turned on and the reflux pumps of the second-stage cyclone, the reflux regulating valve of the first-stage cyclone, and the reflux regulating valve of the second-stage cyclone are turned off, the frequency of the feed pump of the first-stage cyclone is adjusted by the feedback values of the pressure gauges on the feed pipes of the first-stage cyclone and the second-stage cyclone; When the feed pump of the first-stage cyclone and the reflux pump of the second-stage cyclone are turned on and the reflux regulating valve of the first-stage cyclone and the reflux regulating valve of the second-stage cyclone are turned off, the frequencies of the feed pump of the first-stage cyclone and the reflux pump of the second-stage cyclone are adjusted by the feedback values of the pressure gauges on the feed pipes of the first-stage cyclone, the second-stage cyclone, and the reflux pipe of the second-stage cyclone; When the feed pump of the first-stage cyclone, the reflux pump of the second-stage cyclone, and the reflux regulating valve of the first-stage cyclone are turned on and the reflux regulating valve of the second-stage cyclone is turned off, the frequencies of the feed pump and the reflux pump and the opening degree of the reflux regulating valve of the first-stage cyclone are adjusted by the feedback values of the pressure gauges on the feed pipes of the first-stage cyclone, the second-stage cyclone, and the reflux pipe of the second-stage cyclone; When the feed pump of the first-stage cyclone, the reflux pump of the second-stage cyclone, the reflux regulating valve of the first-stage cyclone, and the reflux regulating valve of the second-stage cyclone are all turned on, the frequencies of the feed pump and the reflux pump and the opening degrees of the reflux regulating valve of the first-stage cyclone and the reflux regulating valve of the second-stage cyclone are adjusted by the feedback values of the pressure gauges on the feed pipes of the first-stage cyclone, the second-stage cyclone, and the reflux pipe of the second-stage cyclone.

[0009] Furthermore, the frequency of the feed pump of the first-stage cyclone is adjusted by the feedback values of the pressure gauges on the feed pipes of the first-stage cyclone and the second-stage cyclone. The formula is: Wherein, is the feedback value of the pressure gauge on the feed pipe of the first-stage cyclone, is the feedback value of the pressure gauge on the feed pipe of the second-stage cyclone, is the optimal pressure setting value for the feed of the first-stage cyclone, is the optimal pressure setting value for the feed of the second-stage cyclone, is the frequency of the feed pump of the first-stage cyclone, is the pump frequency adjustment function.

[0010] Furthermore, the frequencies of the feed pump of the first-stage cyclone and the reflux pump of the second-stage cyclone are adjusted by the feedback values of the pressure gauges on the feed pipes of the first-stage cyclone, the second-stage cyclone, and the reflux pipe of the second-stage cyclone. The formula is: Wherein, is the feedback value of the pressure gauge on the reflux pipe of the second-stage cyclone, is the optimal pressure setting value for the reflux feed of the second-stage cyclone, is the frequency of the reflux pump of the second-stage cyclone.

[0011] Further, by the feedback values of the pressure gauges of the feed pipe of the first-stage cyclone, the feed pipe of the second-stage cyclone, and the return pipe of the second-stage cyclone, the frequencies of the feed pump and the return pump and the opening degree of the return flow regulating valve of the first-stage cyclone are adjusted. The formula is: Among them, is the opening degree of the return flow regulating valve of the first-stage cyclone, is the regulating function of the opening degree of the regulating valve; By the feedback values of the pressure gauges of the feed pipe of the first-stage cyclone, the feed pipe of the second-stage cyclone, and the return pipe of the second-stage cyclone, the frequencies of the feed pump and the return pump and the opening degrees of the return flow regulating valve of the first-stage cyclone and the return flow regulating valve of the second-stage cyclone are adjusted. The formula is: Among them, is the opening degree of the return flow regulating valve of the second-stage cyclone.

[0012] In a second aspect, the present invention provides a control system for an enhanced classification cyclone, including: Particle size acquisition module: acquiring the particle sizes of the fine particle feed buffer tank and the overflow product of the cyclone; Particle size comparison module: comparing the particle sizes of the fine particle feed buffer tank and the overflow product of the cyclone with a preset overflow product particle size threshold to obtain a particle size comparison result; Switch adjustment module: performing switch adjustment on the feed pump and the regulating valve of the cyclone based on the particle size comparison result; Control and regulation module: obtaining the cyclone pressure value based on the adjusted states of the feed pump and the regulating valve, and regulating the motor frequency of the feed pump and the opening degree of the regulating valve based on the cyclone pressure value; Particle size determination module: acquiring the particle size of the overflow product of the adjusted cyclone and comparing it with the preset overflow product particle size threshold. When the comparison result meets the particle size requirement, no switch adjustment is performed on the feed pump and the regulating valve of the cyclone, otherwise, the feed pump and the regulating valve of the cyclone are re-switched and adjusted based on the particle size comparison result.

[0013] In a third aspect, the present invention provides a control device for an enhanced classification cyclone, including a processor and a storage medium; The storage medium is used to store instructions; The processor is used to operate according to the instructions to execute the steps of the method according to any one of the above.

[0014] In a fourth aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the steps of the method according to any one of the above are implemented.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention: I. The present invention provides a control system and method for an enhanced classification cyclone. By obtaining the particle sizes of the fine - sized feed buffer tank and the overflow product of the cyclone and comparing them with a preset overflow product particle size threshold, the on - off adjustment of the feed pump and regulating valve of the cyclone is carried out, and based on the cyclone pressure value, the motor frequency of the feed pump and the opening degree of the regulating valve are adjusted, realizing the automatic adjustment of the density and pressure in the cyclone, reducing the operation difficulty of personnel, achieving precise classification, avoiding the mixing of coarse particles into the overflow product of the cyclone resulting in the "coarse - running" phenomenon, and improving the cyclone effect; II. The present invention realizes the feedback control of the frequency of the feed pump through the pressure value of the overflow pipe during the production process of the cyclone, thereby stabilizing the cyclone pressure within its working requirements. Through the particle size sensor and density sensor, by monitoring the density and particle size of the overflow product, it is judged whether the cyclone has the coarse - running phenomenon. When the cyclone has the coarse - running phenomenon, the overflow product is led to the respective cyclone feed inlets and re - sorted through the cyclone; by setting a two - stage cyclone, the overflow product of the first - stage cyclone is further enhanced and sorted. The real - time feedback control of the cyclone is realized by online adjusting parameters through the sensor values, thereby achieving the purpose of enhanced classification and stabilizing the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The attached drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 is the system connection diagram of a control method for an enhanced classification cyclone provided in Embodiment 1 of the present invention; Figure 2 is the flow chart of a control method for an enhanced classification cyclone provided in Embodiment 1 of the present invention; Figure 3 is Figure 2 the flow chart of S2 in Figure 4 is Figure 2 the flow chart of S3 in In the figure: 1. Feed pump for the first - stage cyclone; 2. First - stage cyclone; 3. Overflow particle size detector for the first - stage cyclone; 4. Overflow flowmeter for the first - stage cyclone; 5. Feed pipe pressure gauge for the second - stage cyclone; 6. Second - stage cyclone; 7. Overflow particle size detector for the second - stage cyclone; 8. Overflow flowmeter for the second - stage cyclone; 9. Feed pipe pressure gauge for the first - stage cyclone; 10. Fine - sized feed buffer tank; 11. Return pump for the second - stage cyclone; 12. Return regulating valve for the second - stage cyclone; 13. First non - return valve for the return flow of the second - stage cyclone; 14. Return regulating valve for the first - stage cyclone; 15. Non - return valve for the return flow of the first - stage cyclone; 16. Coarse particle machine feed buffer tank; 17. Return pipe pressure gauge for the second - stage cyclone; 18. Second non - return valve for the return flow of the second - stage cyclone. Detailed Embodiments

[0017] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0018] The following detailed descriptions are all exemplary descriptions, aiming to provide further detailed descriptions of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention pertains. The terms used in the present invention are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention.

[0019] Embodiment 1: The present invention provides a strengthened classification cyclone and its control system, as Figure 1 and Figure 2 shown. This strengthened classification cyclone includes a first-stage cyclone feed pump 1, a first-stage cyclone 2, and a second-stage cyclone 6 that are sequentially connected through pipelines. The discharge pipes of the first-stage cyclone 2 and the second-stage cyclone 6 are commonly connected to a coarse particle machine feed buffer tank 16, where: A first-stage cyclone feed pipe pressure gauge 9 is arranged between the first-stage cyclone feed pump 1 and the first-stage cyclone 2. A first-stage cyclone overflow particle size detector 3, a first-stage cyclone overflow flowmeter 4, and a second-stage cyclone feed pipe pressure gauge 5 are sequentially arranged between the overflow pipe of the first-stage cyclone 2 and the feed pipe of the second-stage cyclone 6; A reflux pipeline is connected from between the second-stage cyclone feed pipe pressure gauge 5 and the second-stage cyclone 6 to the front end of the first-stage cyclone feed pump 1, and a first-stage cyclone reflux regulating valve 14 and a first-stage cyclone reflux check valve 15 are arranged in the reflux pipeline; The overflow pipe of the second-stage cyclone 6 is connected to a fine particle size feed buffer tank 10, and a second-stage cyclone overflow particle size detector 7 and a second-stage cyclone overflow flowmeter 8 are arranged therebetween; The overflow pipe of the fine particle size feed buffer tank 10 is connected to a second-stage cyclone reflux pump 11. The second-stage cyclone reflux pump 11 is connected to the reflux pipeline of the first-stage cyclone 2 and the feed pipe of the second-stage cyclone 6 through two pipelines respectively; A second-stage cyclone reflux regulating valve 12 and a first second-stage cyclone reflux check valve 13 are arranged between the second-stage cyclone reflux pump 11 and the reflux pipeline of the first-stage cyclone 2; A second-stage cyclone reflux pipe pressure gauge 17 and a second second-stage cyclone reflux check valve 18 are arranged between the second-stage cyclone reflux pump 11 and the second-stage cyclone 6.

[0020] This solution includes regulating the first-stage cyclone feed pump 1, regulating the second-stage cyclone reflux pump 11, regulating the second-stage cyclone reflux regulating valve 12, and regulating the first-stage cyclone reflux regulating valve 14, specifically as follows: S1. Set the particle size thresholds of the overflow products of the first-stage cyclone and the second-stage cyclone, and the optimal values of the feed pressure according to production requirements and classification requirements; S2. Control the reflux pump and the reflux valve according to the particle size sensor, and formulate different enhanced classification control strategies to make the fine particle feed buffer tank meet the particle size requirements; S3. Under different control strategies, control the frequencies of the reflux pump and the feed pump to ensure that the feed pressures of the first-stage cyclone and the second-stage cyclone are at the optimal values; S4. Judge the particle size of the products entering the fine particle feed buffer tank. If the particle size requirements are not met (coarse particles running through), return to S2.

[0021] In this embodiment, the methods for setting the particle size thresholds of the overflow products of the first-stage cyclone and the second-stage cyclone and the optimal values of the feed pressure in S1 are as follows: Please refer to Figure 1 , under normal circumstances, the coal slime water undergoes secondary separation through the second-stage cyclone 6, and the particle size d2 entering the fine particle feed buffer tank 10 should be smaller than the pulp particle size d1 entering the second-stage cyclone 6. Combining the production situation and classification requirements, set the upper and lower limit thresholds a and b (a < b) of the particle size. By judging the relationships among d1, d2, a, and b, the operating state of the current enhanced classification cyclone group is given. In addition, set the optimal feed pressure of the cyclone according to the working conditions and actual usage to ensure that the cyclone reaches the optimal classification working state.

[0022] The specific steps of S2 include: S201. Judge the relationships among d1, d2, a, and b; S202. If d2 < d1 < a, control to turn on the feed pump of the first-stage cyclone, turn off the reflux pump of the second-stage cyclone, turn off the reflux regulating valve of the first-stage cyclone, and turn off the reflux regulating valve of the second-stage cyclone; S203. If d2 < a < d1 < b, control to turn on the feed pump of the first-stage cyclone, turn off the reflux pump of the second-stage cyclone, turn on the reflux regulating valve of the first-stage cyclone, and turn off the reflux regulating valve of the second-stage cyclone; S204. If a < d2 < d1 < b, control to turn on the feed pump of the first-stage cyclone, turn on the reflux pump of the second-stage cyclone, turn on the reflux regulating valve of the first-stage cyclone, and turn off the reflux regulating valve of the second-stage cyclone; S205. If a < d2 < b < d1, d2 < d1 < a < b, control to turn on the feed pump of the first-stage cyclone, turn on the reflux pump of the second-stage cyclone, turn on the reflux regulating valve of the first-stage cyclone, and turn on the reflux regulating valve of the second-stage cyclone; In this embodiment, the method for judging the cyclone state by judging the particle size concentration threshold in S202 is as follows: When d2 < d1 < a, that is, the overflow particle sizes of the first-stage cyclone 2 and the second-stage cyclone 6 are smaller than the particle size lower limit threshold a, it is determined that there is no coarse particle running phenomenon in the current enhanced classification cyclone group. At this time, only the feed pump 1 of the first-stage cyclone is opened, and the rest of the reflux valves and the reflux pump 11 of the second-stage cyclone are all closed; In this embodiment, the method for determining the cyclone state by judging the particle size concentration threshold in S203 is as follows: When d2 < a < d1 < b, that is, the overflow particle size of the first-stage cyclone 2 is greater than the particle size threshold lower limit a but smaller than the particle size upper limit b, while the overflow particle size of the second-stage cyclone 6 is smaller than the particle size lower limit a, it is determined that there is a coarse particle running phenomenon in the first-stage cyclone 2 in the current enhanced classification cyclone group, and there is no coarse particle running phenomenon in the second-stage cyclone 6. At this time, the reflux regulating valve 14 of the first-stage cyclone is opened, and the overflow product of the first-stage cyclone 2 is sent back to the feed pipe of the first-stage cyclone 2 for re-separation to achieve the purpose of reducing the particle size of the overflow product of the first-stage cyclone.

[0023] In this embodiment, the method for determining the cyclone state by judging the particle size concentration threshold in S204 is as follows: When a < d2 < d1 < b, that is, the overflow particle sizes of the first-stage cyclone 2 and the second-stage cyclone 6 are greater than the particle size threshold lower limit a and smaller than the particle size upper limit b, it is determined that there is a coarse particle running phenomenon in the first-stage cyclone in the current enhanced classification cyclone group, and there is a slight coarse particle running phenomenon in the second-stage cyclone 6. At this time, the feed pump 1 of the first-stage cyclone is opened, the reflux pump 11 of the second-stage cyclone is opened, the reflux regulating valve 14 of the first-stage cyclone is opened, and the reflux regulating valve 12 of the second-stage cyclone is closed. On the basis of S203, the slurry in the fine particle feed buffer tank 10 is sent back to the feed pipe of the second-stage cyclone 6 for re-separation through the reflux pump 11 of the second-stage cyclone to achieve the purpose of reducing the particle sizes of the overflow products of the first-stage cyclone 2 and the second-stage cyclone 6.

[0024] In this embodiment, the method for determining the cyclone state by judging the particle size concentration threshold in S205 is as follows: When a < d2 < b < d1, d2 < d1 < a < b, that is, the overflow particle sizes of both the first-stage cyclone 2 and the second-stage cyclone 6 are greater than the particle size threshold upper limit a and the threshold lower limit b, it is determined that there is a serious coarse particle running phenomenon in both the first-stage cyclone 2 and the second-stage cyclone 6 in the current enhanced classification cyclone group. At this time, on the basis of S204, the reflux regulating valve 12 of the second-stage cyclone is opened, and while introducing the slurry in the fine particle feed buffer tank 10 into the feed port of the second-stage cyclone 6, it is introduced into the feed port of the first-stage cyclone 2 for re-separation to achieve the purpose of quickly reducing the particle sizes of the overflow products of the first-stage cyclone 2 and the second-stage cyclone 6.

[0025] The specific steps of S3 include: S301. Judge the states of the reflux valves and the feed pumps of the current enhanced classification cyclone group; S302. When the feed pump is turned on, the reflux pump is turned off, and the regulating valve is closed, adjust the frequency of the feed pump of the first-stage cyclone by the feedback values of the pressure gauges of the first-stage cyclone feed pipe and the second-stage cyclone feed pipe. S303. When the feed pump and the reflux pump are turned on and the regulating valve is closed, adjust the frequencies of the feed pump of the first-stage cyclone and the reflux pump of the second-stage cyclone by the feedback values of the pressure gauges of the first-stage cyclone feed pipe, the second-stage cyclone feed pipe, and the reflux pipe pressure gauge of the second-stage cyclone. S304. When the feed pump and the reflux pump are turned on and the reflux regulating valve of the first-stage cyclone is opened, adjust the frequencies of the feed pump and the reflux pump and the opening degree of the reflux regulating valve of the first-stage cyclone by the feedback values of the pressure gauges of the first-stage cyclone feed pipe, the second-stage cyclone feed pipe, and the reflux pipe pressure gauge of the second-stage cyclone. S305. When the feed pump and the reflux pump are turned on and the regulating valve is opened, adjust the frequencies of the feed pump and the reflux pump and the opening degrees of the reflux regulating valve of the first-stage cyclone and the reflux regulating valve of the second-stage cyclone by the feedback values of the pressure gauges of the first-stage cyclone feed pipe, the second-stage cyclone feed pipe, and the reflux pipe pressure gauge of the second-stage cyclone. PID (Proportional-Integral-Derivative) control is a widely used control algorithm in industrial automation. By adjusting the motor frequency of the variable-frequency pump in real time, the feed pressure of the cyclone is maintained stable, thereby optimizing the separation efficiency. According to industry practice, the optimal operating pressure of the cyclone is usually controlled between 0.1 and 0.3 MPa. The signal transmission link of "pressure sensor → PLC (PID operation) → frequency converter → pump motor" is used to maintain the feed pressure stable within the optimal operating pressure .

[0026] The output of the PID algorithm is: where is the adjustment time, is the current time, is the pressure deviation, is the optimal operating pressure value, is the feed pressure value, , , are the proportional, integral, and derivative coefficients respectively, where: the proportional coefficient can quickly adapt to the pressure deviation and output an adjustment amount proportional to the deviation; the integral coefficient can eliminate the steady-state error and continuously accumulate the historical deviation. When is lower than the set value for a long time, the integral term gradually increases the frequency until the deviation returns to zero; the derivative coefficient Predict the pressure change trend, suppress overshoot and oscillation. When the pressure drops rapidly, the differential term increases the frequency in advance to slow down the trend. Consider , where is the frequency of each feed pump after tuning by the PID algorithm.

[0027] The opening degree of each reflux valve will affect the change of its feed pressure. When the frequency of the feed pump remains unchanged, closing the valve will increase the short-term ore inlet pressure, and opening the valve will decrease the short-term ore inlet pressure. Consider , where is the opening degree of each reflux valve ( ).

[0028] In this embodiment, S302 adjusts the frequency of the feed pump 1 of the first-stage cyclone by feeding back the values through the pressure gauge 9 of the first-stage cyclone feed pipe and the pressure gauge 5 of the second-stage cyclone feed pipe. The method is as follows: Among them, is the feedback value of the pressure gauge of the first-stage cyclone feed pipe, is the feedback value of the pressure gauge of the second-stage cyclone feed pipe, is the optimal pressure setting value of the first-stage cyclone feed, is the optimal pressure setting value of the second-stage cyclone feed, is the frequency of the feed pump of the first-stage cyclone, is the pump frequency adjustment function.

[0029] In this embodiment, S303 adjusts the frequencies of the feed pump 1 of the first-stage cyclone and the reflux pump 11 of the second-stage cyclone by feeding back the values through the pressure gauge 9 of the first-stage cyclone feed pipe, the pressure gauge 5 of the second-stage cyclone feed pipe, and the pressure gauge 17 of the second-stage cyclone reflux pipe. The method is as follows: Among them, is the feedback value of the pressure gauge of the second-stage cyclone reflux pipe, is the optimal pressure setting value of the second-stage cyclone reflux feed, where and The settings should ensure that the pressure in the second-stage cyclone 6 is between 0.1 and 0.3 MPa, is the frequency of the reflux pump of the second-stage cyclone.

[0030] In this embodiment, S304 adjusts the frequencies of the feed pump and the reflux pump and the opening degree of the reflux regulating valve 14 of the first-stage cyclone by feeding back the values through the pressure gauge 9 of the first-stage cyclone feed pipe, the pressure gauge 5 of the second-stage cyclone feed pipe, and the pressure gauge 17 of the second-stage cyclone reflux pipe. The method is as follows: Among them, is the opening degree of the reflux regulating valve of the first-stage cyclone, is the regulating valve opening degree adjustment function.

[0031] In this embodiment, S305 adjusts the frequencies of the feed pump and the reflux pump, and the opening degrees of the first-stage cyclone reflux regulating valve 14 and the second-stage cyclone reflux regulating valve 12 by means of the feedback values of the first-stage cyclone feed pipe pressure gauge 9, the second-stage cyclone feed pipe pressure gauge 5, and the second-stage cyclone reflux pipe pressure gauge 17. The method is as follows: Among them, is the opening degree of the second-stage cyclone reflux regulating valve.

[0032] The working process is as follows: 1) A first-stage cyclone feed pipe pressure gauge 9 is arranged in front of the feed port of the first-stage cyclone 2, and a first-stage cyclone overflow particle size detector 3, a first-stage cyclone overflow flowmeter 4, and a second-stage cyclone feed pipe pressure gauge 5 are arranged between the overflow pipe of the first-stage cyclone 2 and the feed pipe of the second-stage cyclone 6; a second-stage cyclone overflow particle size detector 7 and a second-stage cyclone overflow flowmeter 8 are arranged between the overflow pipe of the second-stage cyclone 6 and the fine particle feed buffer tank 10; a second-stage cyclone reflux pipe pressure gauge 17 is arranged behind the second-stage reflux pump 6. The operating state of the enhanced classification cyclone is judged by monitoring the changes of the above sensor values.

[0033] 2) The overflow pipe of the first-stage cyclone 2 is introduced into the feed port of the second-stage cyclone 6 to complete the preliminary two-stage separation.

[0034] 3) According to the production situation and classification requirements, the upper and lower limit thresholds a and b (a < b) of the particle size and the optimal feed pressure of the cyclone are set.

[0035] 4) Judge the relationship between the pulp particle size d1 entering the second-stage cyclone 6 and the pulp particle size d2 (d2 < d1) entering the fine particle feed buffer tank 10 and the set upper and lower limit thresholds a and b (a < b) of the particle size. If d2 < d1 < a, control to turn on the first-stage cyclone feed pump 1, turn off the second-stage cyclone reflux pump 11, turn off the first-stage cyclone reflux regulating valve 14, and turn off the second-stage cyclone reflux regulating valve 12. If d2 < a < d1 < b, control to turn on the first-stage cyclone feed pump 1, turn off the second-stage cyclone reflux pump 11, turn on the first-stage cyclone reflux regulating valve 14, and turn off the second-stage cyclone reflux regulating valve 12. If a < d2 < d1 < b, control to turn on the first-stage cyclone feed pump 1, turn on the second-stage cyclone reflux pump 11, turn on the first-stage cyclone reflux regulating valve 14, and turn off the second-stage cyclone reflux regulating valve 12. If a < d2 < b < d1, d2 < d1 < a < b, control to turn on the first-stage cyclone feed pump 1, turn on the second-stage cyclone reflux pump 11, turn on the first-stage cyclone reflux regulating valve 14, and turn on the second-stage cyclone reflux regulating valve 12, so that finally the particle size d1 entering the fine particle feed buffer tank 10 < a and the state converges.

[0036] 5) Judge the states of the reflux valves and feed pumps of the current enhanced classification hydrocyclone group. When the feed pump is turned on, the reflux pump is turned off, and the regulating valve is turned off, adjust the frequency of the feed pump 1 of the first-stage hydrocyclone through the feedback values of the pressure gauge 9 of the feed pipe of the first-stage hydrocyclone and the pressure gauge 5 of the feed pipe of the second-stage hydrocyclone; when the feed pump and the reflux pump are turned on and the regulating valve is turned off, adjust the frequency of the feed pump 1 of the first-stage hydrocyclone and the reflux pump 11 of the second-stage hydrocyclone through the feedback values of the pressure gauge 9 of the feed pipe of the first-stage hydrocyclone, the pressure gauge 5 of the feed pipe of the second-stage hydrocyclone, and the pressure gauge 17 of the reflux pipe of the second-stage hydrocyclone; when the feed pump and the reflux pump are turned on and the reflux regulating valve 14 of the first-stage hydrocyclone is turned on, adjust the frequencies of the feed pump and the reflux pump and the opening degree of the reflux regulating valve 14 of the first-stage hydrocyclone through the feedback values of the pressure gauge 9 of the feed pipe of the first-stage hydrocyclone, the pressure gauge 5 of the feed pipe of the second-stage hydrocyclone, and the pressure gauge 17 of the reflux pipe of the second-stage hydrocyclone; when the feed pump and the reflux pump are turned on and the regulating valve is turned on, adjust the frequencies of the feed pump and the reflux pump and the opening degrees of the reflux regulating valve 14 of the first-stage hydrocyclone and the reflux regulating valve 12 of the second-stage hydrocyclone through the feedback values of the pressure gauge 9 of the feed pipe of the first-stage hydrocyclone, the pressure gauge 5 of the feed pipe of the second-stage hydrocyclone, and the pressure gauge 17 of the reflux pipe of the second-stage hydrocyclone, so as to maintain the stability of the feed pressure of the first-stage hydrocyclone 2 and the second-stage hydrocyclone 6.

[0037] The present invention provides an enhanced classification hydrocyclone and its control system. By comparing the feedback value measured by the particle size sensor with the preset particle size threshold, various components of the enhanced classification hydrocyclone system are regulated according to different situations, and different strategies are formulated to send the overflow products of the first-stage hydrocyclone 2 and the second-stage hydrocyclone 6 back to the feed inlet of the hydrocyclone for re-separation; and the PID algorithm is adopted for different control strategies, taking the pressure values of each pipeline as feedback quantities, adjusting the parameters of the variable-frequency feed pump and the opening degree of the regulating valve, and stabilizing the pressure inside the hydrocyclone. It effectively overcomes the phenomenon of coarse particles running away in the hydrocyclone overflow.

[0038] Embodiment 2: A control system for an enhanced classification hydrocyclone can implement the control method of an enhanced classification hydrocyclone described in Embodiment 1, including: Particle size acquisition module: acquire the particle sizes of the fine-grained feed buffer tank and the overflow product of the hydrocyclone; Particle size comparison module: compare the particle sizes of the fine-grained feed buffer tank and the overflow product of the hydrocyclone with the preset overflow product particle size threshold to obtain a particle size comparison result; Switch adjustment module: perform switch adjustment on the feed pump and the regulating valve of the hydrocyclone based on the particle size comparison result; Control adjustment module: based on the adjusted states of the feed pump and the regulating valve, acquire the hydrocyclone pressure value, and adjust the motor frequency of the feed pump and the opening degree of the regulating valve based on the hydrocyclone pressure value; Particle size determination module: Obtain the particle size of the adjusted hydrocyclone overflow product and compare it with the preset overflow product particle size threshold. When the comparison result meets the particle size requirement, do not perform on-off adjustment on the feed pump and regulating valve of the hydrocyclone; otherwise, re-perform on-off adjustment on the feed pump and regulating valve of the hydrocyclone based on the particle size comparison result.

[0039] Embodiment 3: The embodiment of the present invention further provides a control device for an enhanced classification hydrocyclone, which can implement the control method of an enhanced classification hydrocyclone described in Embodiment 1, including a processor and a storage medium; The storage medium is used to store instructions; The processor is used to operate according to the instructions to execute the steps of the following method: Obtain the particle sizes of the fine particle size feed buffer tank and the hydrocyclone overflow product; Compare the particle sizes of the fine particle size feed buffer tank and the hydrocyclone overflow product with the preset overflow product particle size threshold to obtain a particle size comparison result; Perform on-off adjustment on the feed pump and regulating valve of the hydrocyclone based on the particle size comparison result; Based on the adjusted states of the feed pump and regulating valve, obtain the hydrocyclone pressure value, and adjust the motor frequency of the feed pump and the opening degree of the regulating valve based on the hydrocyclone pressure value; Obtain the particle size of the adjusted hydrocyclone overflow product and compare it with the preset overflow product particle size threshold. When the comparison result meets the particle size requirement, do not perform on-off adjustment on the feed pump and regulating valve of the hydrocyclone; otherwise, re-perform on-off adjustment on the feed pump and regulating valve of the hydrocyclone based on the particle size comparison result.

[0040] Embodiment 4: The embodiment of the present invention further provides a computer-readable storage medium, which can implement the control method of an enhanced classification hydrocyclone described in Embodiment 1. A computer program is stored thereon, and when the program is executed by a processor, the steps of the following method are implemented: Obtain the particle sizes of the fine particle size feed buffer tank and the hydrocyclone overflow product; Compare the particle sizes of the fine particle size feed buffer tank and the hydrocyclone overflow product with the preset overflow product particle size threshold to obtain a particle size comparison result; Perform on-off adjustment on the feed pump and regulating valve of the hydrocyclone based on the particle size comparison result; Based on the adjusted states of the feed pump and regulating valve, obtain the hydrocyclone pressure value, and adjust the motor frequency of the feed pump and the opening degree of the regulating valve based on the hydrocyclone pressure value; Obtain the adjusted particle size of the cyclone overflow product and compare it with the preset overflow product particle size threshold. In response to the comparison result meeting the particle size requirement, do not perform switching adjustments on the feed pump and regulating valve of the cyclone; otherwise, re-perform switching adjustments on the feed pump and regulating valve of the cyclone based on the particle size comparison result.

[0041] As is known by common technical knowledge, the present invention can be implemented by other embodiments that do not depart from its spirit or essential features. Therefore, the above-disclosed embodiments are illustrative in all aspects and not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are encompassed by the present invention.

[0042] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. 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. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) that contain computer-usable program code.

[0043] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0044] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0045] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are performed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide means for implementing the functions in the flowFigure 1 One process or multiple processes and / or boxes Figure 1 Steps of the functions specified in one box or multiple boxes.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the specific implementation manners of the present invention, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A control method for an enhanced classification cyclone, characterized in that: include: Obtain the particle size of the overflow product from the fine-grained feed buffer box and the cyclone; Compare the particle sizes of the overflow products of the fine-grained material buffer box and the cyclone with the preset overflow product particle size threshold to obtain a particle size comparison result; Based on the particle size comparison results, the feed pump and regulating valve of the cyclone are switched on and off; Based on the adjusted state of the feed pump and the regulating valve, the cyclone pressure value is obtained, and the motor frequency of the feed pump and the opening of the regulating valve are adjusted based on the cyclone pressure value; The adjusted cyclone overflow product particle size is obtained and compared with a preset overflow product particle size threshold. In response to the comparison result meeting the particle size requirement, the feed pump and the regulating valve of the cyclone are not switched on and off. Otherwise, the feed pump and the regulating valve of the cyclone are switched on and off again based on the particle size comparison result.

2. The control method of the enhanced classification cyclone according to claim 1 is characterized in that: The particle size comparison results include: d2<d1<a d2<a<d1<b a<d2<d1<b a<d2<b<d1 d2<d1<a<b Among them: d2 is the slurry particle size entering the fine-grained material buffer box, d1 is the slurry particle size entering the second-stage cyclone, and a and b are the upper and lower limit thresholds of the particle size respectively.

3. The control method of the enhanced classification cyclone according to claim 2 is characterized in that: Based on the particle size comparison results, the feed pump and regulating valve of the cyclone are switched on and off, including: In response to d2<d1<a, the feed pump of the first stage cyclone is opened, the return pump of the second stage cyclone is closed, the return regulating valve of the first stage cyclone is closed, and the return regulating valve of the second stage cyclone is closed; In response to d2<a<d1<b, the feed pump of the first stage cyclone is opened, the return pump of the second stage cyclone is closed, the return regulating valve of the first stage cyclone is opened, and the return regulating valve of the second stage cyclone is closed; In response to a<d2<d1<b, the feed pump of the first stage cyclone is controlled to be turned on, the return pump of the second stage cyclone is turned on, the return regulating valve of the first stage cyclone is turned on, and the return regulating valve of the second stage cyclone is turned off; In response to a<d2<b<d1 or d2<d1<a<b, control to open the first stage cyclone feed pump, open the second stage cyclone reflux pump, open the first stage cyclone reflux regulating valve, and open the second stage cyclone reflux regulating valve.

4. The control method of the enhanced classification cyclone according to claim 3 is characterized in that: Based on the adjusted state of the feed pump and the regulating valve, the cyclone pressure value is obtained, and the motor frequency of the feed pump and the opening of the regulating valve are adjusted based on the cyclone pressure value, including: In response to the first-stage cyclone feed pump being turned on and the second-stage cyclone return pump, the first-stage cyclone return regulating valve, and the second-stage cyclone return regulating valve being turned off, the first-stage cyclone feed pipe pressure gauge and the second-stage cyclone feed pipe pressure gauge feedback values ​​to adjust the first-stage cyclone feed pump frequency; In response to the first-stage cyclone feed pump and the second-stage cyclone return pump being turned on and the first-stage cyclone return regulating valve and the second-stage cyclone return regulating valve being closed, the first-stage cyclone feed pipe pressure gauge, the second-stage cyclone feed pipe pressure gauge, and the second-stage cyclone return pipe pressure gauge feedback values ​​to adjust the first-stage cyclone feed pump and the second-stage cyclone return pump frequency; In response to the first-stage cyclone feed pump, the second-stage cyclone return pump, and the first-stage cyclone return regulating valve being turned on and the second-stage cyclone return regulating valve being turned off, the feed pump and the return pump frequency and the opening of the first-stage cyclone return regulating valve are adjusted through the feedback values ​​of the first-stage cyclone feed pipe pressure gauge, the second-stage cyclone feed pipe pressure gauge, and the second-stage cyclone return pipe pressure gauge; In response to the first-stage cyclone feed pump, the second-stage cyclone reflux pump, the first-stage cyclone reflux regulating valve and the second-stage cyclone reflux regulating valve being turned on, the first-stage cyclone feed pipe pressure gauge, the second-stage cyclone feed pipe pressure gauge and the second-stage cyclone reflux pipe pressure gauge feedback values ​​to adjust the feed pump, reflux pump frequency and the first-stage cyclone reflux regulating valve and the second-stage cyclone reflux regulating valve opening.

5. The control method of the enhanced classification cyclone according to claim 4 is characterized in that: The frequency of the first-stage cyclone feed pump is adjusted by the feedback value of the first-stage cyclone feed pipe pressure gauge and the second-stage cyclone feed pipe pressure gauge. The formula is: in, This is the feedback value of the pressure gauge of the cyclone feeding pipe. It is the feedback value of the pressure gauge of the second-stage cyclone feed pipe. The optimal pressure setting value for feeding ore to a cyclone is: The optimal pressure setting value for feeding ore to the second-stage cyclone is: is the frequency of the cyclone feed pump, is the pump frequency adjustment function.

6. The control method of the enhanced classification cyclone according to claim 5 is characterized in that: Adjust the frequency of the first-stage cyclone feed pump and the second-stage cyclone return pump through the feedback values ​​of the first-stage cyclone feed pipe pressure gauge, the second-stage cyclone feed pipe pressure gauge, and the second-stage cyclone return pipe pressure gauge. The formula is: in, It is the feedback value of the pressure gauge of the return pipe of the second-stage cyclone. The optimal pressure setting value for the return flow to the second-stage cyclone is is the frequency of the second-stage cyclone reflux pump.

7. The control method of the enhanced classification cyclone according to claim 6 is characterized in that: Through the feedback values ​​of the first-stage cyclone feed pipe pressure gauge, the second-stage cyclone feed pipe pressure gauge, and the second-stage cyclone return pipe pressure gauge, the feed pump, the return pump frequency and the first-stage cyclone return regulating valve opening are adjusted. The formula is: in, is the opening of the cyclone return regulating valve, is the regulating valve opening adjustment function; Through the feedback values ​​of the first-stage cyclone feed pipe pressure gauge, the second-stage cyclone feed pipe pressure gauge, and the second-stage cyclone return pipe pressure gauge, the feed pump and return pump frequency and the first-stage cyclone return flow regulating valve and the second-stage cyclone return flow regulating valve opening are adjusted. The formula is: in, It is the opening of the second-stage cyclone return flow regulating valve.

8. A control system for an enhanced classification cyclone, characterized in that: include: Particle size acquisition module: obtains the particle size of the overflow product of the fine-grained feed buffer box and the cyclone; Particle size comparison module: compares the particle size of the overflow product from the fine-grained feed buffer box and the cyclone with the preset overflow product particle size threshold to obtain the particle size comparison result; Switch adjustment module: based on the particle size comparison results, the feed pump and regulating valve of the cyclone are adjusted on and off; Control and regulation module: based on the adjusted feed pump and regulating valve status, obtain the cyclone pressure value, and adjust the motor frequency of the feed pump and the opening of the regulating valve based on the cyclone pressure value; Particle size determination module: obtains the adjusted cyclone overflow product particle size and compares it with the preset overflow product particle size threshold. When the comparison result meets the particle size requirement, the cyclone feed pump and regulating valve are not switched on or off. Otherwise, the cyclone feed pump and regulating valve are switched on and off again based on the particle size comparison result.

9. A control device for an enhanced classification cyclone, characterized in that: including processor and storage medium; The storage medium is used to store instructions; The processor is used to operate according to the instructions to execute the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method described in any one of claims 1 to 7 are implemented.

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