Product quality automatic regulation and control method of coarse slime separation system

Abstract

The invention discloses an automatic product quality regulation and control method for a coarse slime separation system in the technical field of slime separation and recovery. The method comprises the steps that the real-time feeding concentration value, the real-time feeding size fraction, the feeding flow, the clean coal size fraction, the tailing size fraction, the clean coal ash content detection value and the tailing ash content detection value of a teetered bed separator are obtained; based on the real-time feeding concentration value of the teetered bed sorting machine, controlling the backflow amount of the grading cyclone group; setting the water jacking amount of the teetered bed sorting machine based on the real-time feeding size fraction and the feeding flow of the teetered bed sorting machine; the water jacking amount of the teetered bed separator is adjusted based on the feeding size fraction, the clean coal size fraction and the tailing size fraction of the teetered bed separator; and the set density is adjusted based on the clean coal ash content detection value and the tail coal ash content detection value of the teetered bed sorting machine. According to the method, the coarse slime separation process is stabilized from the source in a feed-forward and feedback adjusting mode, so that the product quality is stabilized, and the problem that production regulation is not timely or incomplete is effectively solved.

Description

Technical Field

[0001] The invention relates to a product quality automatic control method for a coarse coal slime sorting system, belonging to the technical field of coal slime sorting and recovery. Background Art

[0002] Coarse coal slime sorting, commonly used process equipment in coal preparation plants include coal slime heavy medium cyclone, water medium cyclone, interference bed separator, spiral separator, etc. Coking coal preparation plants generally use interference bed separators for coarse coal slime sorting. The sorting principle of the interference bed separator is the interference sedimentation principle. During the sorting process, the slurry enters the feed well tangentially through the feed pipe, and forms an interference bed in the trough under the action of the rising water flow and its own gravity. The low-density particles move upward, overflow to the overflow trough and are discharged from the overflow port. The high-density particles move downward and pass through the interference bed, concentrate at the bottom of the trough body, and are discharged from the bottom flow port. A density meter is set in the middle and lower part of the interference bed, and a discharge valve is set at the bottom of the trough body. The discharge valve is automatically opened or closed and the opening of the discharge valve is controlled by the detected bed density.

[0003] The coarse coal slime sorting link is a typical profit growth point of the coal preparation plant, but the production management has always been relatively extensive. In actual production, the product index adjustment of the coarse coal slime sorting system mainly relies on manual sampling and testing. The particle size and ash content of the tested product are used to feedback and adjust the set density and top water volume of the coarse coal slime sorting system. However, the particle size test results and the ash content have a strong lag, generally at least 1.5 hours, which makes it impossible to adjust the sorting parameters in real time, resulting in poor timeliness and poor stability of the sorting product indicators, which does not meet the product market requirements.

[0004] In recent years, some coal preparation plants have upgraded the production control systems of interference bed separators during intelligent construction. By adding online monitoring sensors for clean coal and tail coal of the interference bed separators, and real-time linkage between the online monitoring data and the set density and top water volume of the interference bed separators, the stability of product quality has been improved. However, this decision-making algorithm based on the linkage between online detection data and production parameters is relatively extensive, resulting in poor regulation effect. In addition, this associated control often only focuses on the particle size and ash content of clean coal products, and ignores the adjustment needs of tail coal product indicators. Therefore, it can only solve some production regulation problems, but cannot completely solve the problems of poor timeliness of regulation of the interference bed production process, poor regulation effect and unstable feed, including unstable production process caused by unstable feed concentration, flow rate or particle size, and deterioration of production indicators. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for automatically controlling the product quality of a coarse coal slime sorting system. Through the "feedforward + feedback" adjustment method, the coarse coal slime sorting process is stabilized from the source, thereby stabilizing the product quality and effectively solving the problem of untimely or imperfect production regulation.

[0006] To achieve the above object, the present invention is implemented by adopting the following technical solutions: In a first aspect, the present invention provides a method for automatically controlling product quality of a coarse coal slime sorting system, comprising: Obtain the real-time feed concentration value, real-time feed particle size, feed flow rate, clean coal particle size and tail coal particle size of the interference bed separator, as well as the clean coal ash content detection value and tail coal ash content detection value; The return flow rate of the classifying cyclone group is controlled based on the real-time feed concentration value of the interference bed separator; The top water volume of the interference bed separator is set based on the real-time feed size and feed flow rate of the interference bed separator; Adjust the top water volume of the interference bed separator based on the feed size, clean coal size and tail coal size of the interference bed separator; The set density is adjusted based on the clean coal ash content test value and the tail coal ash content test value of the interference bed separator.

[0007] Furthermore, the return flow rate of the classifying cyclone group is controlled based on the real-time feed concentration value of the interference bed separator, including: Set the feed concentration range of the interference bed separator; Compare the real-time feed concentration value of the interference bed separator with the feed concentration range; In response to the real-time feed concentration value of the interference bed separator being within the feed concentration range, the underflow reflux regulating valve of the grading cyclone group and the overflow reflux regulating valve of the grading cyclone group are controlled to remain in a normally closed state; In response to the real-time feed concentration value of the interference bed separator being higher than the feed concentration range, the overflow reflux regulating valve of the grading cyclone group is opened to return a part of the overflow of the grading cyclone to the coal slime bucket, thereby reducing the feed concentration of the grading cyclone group and thus reducing the feed concentration of the interference bed separator; In response to the real-time feed concentration value of the interference bed separator being lower than the feed concentration range, the underflow reflux regulating valve of the grading cyclone group is opened to return part of the underflow of the grading cyclone to the coal slime bucket, thereby increasing the feed concentration of the grading cyclone group and thus increasing the feed concentration of the interference bed separator.

[0008] Furthermore, the calculation method for adjusting the opening of the underflow reflux regulating valve of the graded cyclone group and the overflow reflux regulating valve of the graded cyclone group is: setting a basic value, an upper limit and a lower limit for the valve opening, and adjusting the valve opening within the upper and lower limits during the reflux flow regulation process, and the calculation formula is: Where: m is the valve opening, m0 is the basic value of the valve opening, is the upper limit of valve opening, is the lower limit of valve opening, k1 is the calculation slope, y is the actual feed concentration of the interference bed separator, and x is the optimal feed concentration of the interference bed separator.

[0009] Furthermore, during the process of adjusting the valve opening: In response to the feed concentration of the grading cyclone group being higher than the preset upper limit or the feed flow rate being lower than the preset lower limit, the overflow reflux regulating valve and the underflow reflux regulating valve of the grading cyclone group are closed, and when the set time has not returned to the threshold range, a pop-up message is pushed to remind the upstream desludging link to increase the water spraying amount; In response to the feed concentration of the grading cyclone group being lower than the preset lower limit or the feed flow rate being higher than the preset upper limit, the overflow reflux regulating valve and the underflow reflux regulating valve of the grading cyclone group are closed, and when the set waiting time has not returned to the threshold range, a pop-up message is pushed to remind the upstream desludging link to reduce the amount of water sprayed; The number of opened cyclones in the grading cyclone group is adapted to the feed flow rate of the grading cyclone group and is automatically controlled according to the real-time feed concentration and feed flow rate of the grading cyclone group.

[0010] Furthermore, the top water volume of the interference bed separator is set based on the real-time feed particle size and feed flow rate of the interference bed separator, including: Set the threshold range of the feed size and feed flow rate of the interference bed separator; Compare the real-time feed size and feed flow rate of the interference bed separator with the threshold range; In response to the feed flow rate being within a threshold range, setting the top water volume as a basic value; In response to the feed flow rate exceeding the threshold range, the top water volume is set to is the basic value of topwater volume, k2 is the calculation coefficient 2 for top water adjustment. is the feed flow rate; In response to the 1-0.5mm feed particle size exceeding the threshold range, the top water volume is set to , Q d1 is the calculation of top water volume based on flow comparison, k3 is the calculation coefficient three for top water volume adjustment, The feed size is 1-0.5 mm, and z2 is the optimal proportion under the particle size of 1-0.5 mm; In response to the feed size less than 0.25 mm exceeding the threshold range, the top water volume is set to , Q d1 is the calculation of top water volume based on flow comparison, k4 is the calculation coefficient of top water volume adjustment, The feed particle size is less than 0.25 mm, and z4 is the optimal proportion under the particle size of less than 0.25 mm.

[0011] Furthermore, the top water volume of the interference bed separator is adjusted based on the feed size, clean coal size and tail coal size of the interference bed separator, including: Set the mapping relationship between the feed size of the interference bed separator and the clean coal size and tail coal size; Compare the feed size, clean coal size and tail coal size of the interference bed separator with the preset mapping relationship; In response to the fact that the clean coal particle size ratio of the 1-0.5 mm coarse particle size class is greater than the clean coal particle size ratio threshold of the particle size class and the clean coal particle size ratio of the fine particle size class less than 0.25 mm is less than the clean coal particle size ratio threshold of the particle size class, it is determined that the top water volume is too large, and the top water volume is reduced within the top water volume threshold range until the clean coal particle size ratio falling into the particle size class is within the threshold range; In response to the fact that the clean coal particle size ratio of the 1-0.5 mm coarse particle size class is less than the clean coal particle size ratio threshold of the particle size class and the clean coal particle size ratio of the fine particle size class less than 0.25 mm is greater than the clean coal particle size ratio threshold of the particle size class, it is determined that the top water amount is too small, and the top water is increased within the top water range until it falls within the clean coal particle size ratio threshold range of the particle size class; In response to the fact that the proportion of the coarse-grained clean coal of 1-0.5 mm or the proportion of the fine-grained clean coal of less than 0.25 mm is not within the threshold range, the top water amount is not adjusted.

[0012] Further, the set density is adjusted based on the clean coal ash detection value and the tail coal ash detection value of the interference bed separator, including: Set the clean coal ash target value A1 or tail coal ash target value A2 of the coarse coal slime separation system; Based on the clean coal ash target value A1 or the tail coal ash target value A2, the appropriate clean coal ash content in the production process is set as A dj And the appropriate tailing ash is divided into A dw , where: A1-Δ j ×A1≤A dj ≤A1+Δ j ×A1,Δ j is the fluctuating threshold of clean coal ash content, A2-Δ w ×A2≤A dw ≤A2+Δ w ×A2,Δ w is the fluctuation threshold of tail coal ash content; The clean coal ash content detection value A j And tail coal ash detection value A w With appropriate clean coal ash is divided into A dj And the appropriate tailing ash is divided into A dw Make comparisons and judge the way production is organized; In response to the production organization mode of preserving clean coal, the clean coal ash value A j Compared with the preset suitable clean coal ash content Adj If the clean coal ash value Aj is greater than the preset appropriate clean coal ash value A dj , reduce the set density until it falls within the preset clean coal ash content threshold; if the clean coal ash content value A j Less than the preset suitable clean coal ash content A dj , increase the set density until it falls within the preset clean coal ash content threshold; In response to the production organization mode of preserving tailing coal, the detected tailing coal ash value A w The preset suitable tailing ash content A dw By comparison, if the tailing ash value is A w Greater than the preset appropriate tailing ash threshold A dw , then the clean coal ash value A j With A dj Compare, if A j If the tail coal ash value is within the threshold range, the set density will not be adjusted. Otherwise, the set density will be reduced until it falls within the preset tail coal ash content threshold. w Less than the preset suitable tailing ash content A dw , increase the set density until it falls within the preset tailing coal ash content threshold.

[0013] In a second aspect, the present invention provides a product quality automatic control system for a coarse coal slime sorting system, comprising: Data acquisition module: obtains the real-time feed concentration value, real-time feed particle size, feed flow rate, clean coal particle size and tail coal particle size of the interference bed separator, as well as the clean coal ash content detection value and tail coal ash content detection value; Backflow control module: the backflow control of the classification cyclone group is carried out based on the real-time feed concentration value of the interference bed separator; Top water volume setting module: the top water volume of the interference bed separator is set based on the real-time feed particle size and feed flow rate of the interference bed separator; Top water volume adjustment module: adjusts the top water volume of the interference bed separator based on the feed size, clean coal size and tail coal size of the interference bed separator; Set density adjustment module: adjust the set density based on the clean coal ash detection value and tail coal ash detection value of the interference bed separator.

[0014] In a third aspect, the present invention provides a product quality automatic control device for a coarse coal slime sorting system, comprising 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 any of the above methods.

[0015] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of any of the above methods when executed by a processor.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention proposes a method for automatically controlling the product quality of a coarse coal slime sorting system, including controlling the feed concentration, controlling the clean coal yield, and controlling the clean coal ash content or the tail coal ash content. It not only realizes the automatic adjustment of the sorting parameters of the interference bed sorting machine according to the feed concentration, feed flow rate, feed particle size, clean coal product particle size, tail coal product particle size, clean coal ash content and tail coal ash content during the production process, but also can adjust and stabilize the feed concentration of the interference bed sorting machine online, and realizes the stabilization of the coarse coal slime sorting process from the source through this "feedforward + feedback" adjustment mode, thereby stabilizing the product quality, and effectively solving the problem of untimely or imperfect production regulation; 2. The present invention improves the production efficiency and sorting accuracy of coarse coal slime sorting, can dynamically adapt to raw material fluctuations, and optimizes the sorting accuracy and feed particle size matching; in addition, in terms of product quality and resource utilization, it achieves maximization of clean coal yield and controllable tail coal ash content; in terms of process stability and operating costs, this scheme enhances the stability of feed concentration while saving energy consumption, reduces manual intervention through intelligence and operation and maintenance advantages, realizes data-driven optimization, and achieves environmental and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings: Figure 1 A schematic diagram of a product quality automatic control system for a coarse coal slime separation system provided in Embodiment 1 of the present invention; Figure 2 A schematic flow chart of a method for automatically controlling product quality of a coarse coal slime separation system provided in Embodiment 2 of the present invention.

[0018] Figure 3 for Figure 2 Specific process diagram of S1; Figure 4 for Figure 2 The specific process diagram of S2 in FIG. Figure 5 for Figure 2 The specific process diagram of S3 in the figure; Figure 6 for Figure 2 Schematic diagram of the specific process of S4.

[0019] In the figure: 1. Coal slurry bucket; 2. Coal slurry pump; 3. Classified cyclone group; 4. Interference bed separator; 5. Top water bucket; 6. Top water pump; 7. First emergency discharge valve; 8. Classified cyclone group feed concentration meter; 9. Classified cyclone group feed flow meter; 10. Classified cyclone group feed pressure detection meter; 11. Classified cyclone group overflow reflux regulating valve; 12. Classified cyclone group bottom flow particle size detector; 13. Classified cyclone group bottom flow concentration meter; 14. Classified cyclone 1. Underflow flow meter of the device group; 2. Underflow reflux regulating valve of the grading cyclone group; 3. Clean coal particle size detector of the interference bed separator; 4. Clean coal ash detector of the interference bed separator; 5. Second emergency discharge valve; 6. Top water flow meter; 7. Top water pressure detection gauge; 8. Tail coal discharge valve of the interference bed separator; 9. Tail coal particle size detector of the interference bed separator; 10. Tail coal ash detector of the interference bed separator; 11. Programmable controller; 12. Industrial control integrated machine. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0021] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. 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.

[0022] Embodiment 1: See also Figure 1 The present embodiment provides a coarse coal slime sorting system, including: a grading cyclone group 3, an interference bed separator 4, a top water pump 6, an overflow reflux regulating valve 11 of the grading cyclone group, an underflow particle size detector 12 of the grading cyclone group, an underflow concentration meter 13 of the grading cyclone group, an underflow reflux regulating valve 15 of the grading cyclone group, an interference bed separator clean coal particle size detector 16, an interference bed separator clean coal ash detector 17, an interference bed separator 4 tail coal discharge valve, an interference bed separator tail coal particle size detector 22, and an interference bed separator tail coal ash detector 23. , programmable controller 24, industrial control integrated machine 25; a coal slurry bucket 1 and a coal slurry pump 2 are provided in the process upstream of the grading cyclone group 3, the coal slurry bucket 1 and the coal slurry pump 2 are connected by a pipeline, and a first emergency discharge valve 7 is connected in the middle of the pipeline to facilitate shutdown and maintenance; the grading cyclone group 3 is connected with a feed pipe, an underflow pipe and an overflow pipe, the starting end of the feed pipe is connected to the outlet of the coal slurry pump 2, and the terminal end of the underflow pipe is connected to the interference bed separator 4; the feed pipe is connected to the grading cyclone group feed concentration meter 8 and the grading cyclone group feed flowmeter 9 through a pipeline; In this embodiment, the feed pipeline is connected to the feed pressure detection meter 10 of the graded cyclone group through a pipeline; the overflow pipe is connected to the overflow reflux regulating valve 11 of the graded cyclone group through a pipeline; the underflow pipe is connected to the underflow particle size detector 12 of the graded cyclone group, the underflow concentration meter 13 of the graded cyclone group, the underflow flowmeter 14 of the graded cyclone group and the underflow reflux regulating valve 15 of the graded cyclone group through a pipeline; the interference bed separator 4 is connected with a feed pipe, a top water pipe, an overflow pipe and an underflow pipe, and the bottom of the interference bed separator 4 is connected with an interference bed separator tail coal discharge valve 21, and the discharge valve is integrated with the interference bed separator 4; the feed pipe is the underflow pipe of the graded cyclone group 3, the starting end of the feed pipe is the underflow port of the graded cyclone group 3, and the end end is the inlet of the interference bed separator 4; the top water pipe is connected to the top water flowmeter 19 and the top water pump 6 through a pipeline; In this embodiment, the top water pipe is connected to the top water pressure detection gauge 20 through a pipeline; the starting end of the overflow pipe is the overflow port of the interference bed separator 4, and is connected to the interference bed separator clean coal particle size detector 16 and the interference bed separator clean coal ash detector 17 through a pipeline; the starting end of the bottom flow pipe is the bottom flow discharge port of the interference bed separator 4, and is connected to the interference bed separator tail coal particle size detector 22 and the interference bed separator tail coal ash detector 23 through a pipeline; the top water pump 6 is connected to the top water bucket 5 through a pipeline, and a second emergency discharge valve 18 is provided on the pipeline to facilitate shutdown and maintenance. The input material of the top water bucket 5 is generally the circulating water of the coal preparation plant; the coal slurry pump 2, the graded cyclone group feed concentration meter 8, the graded cyclone group feed flowmeter 9, and the graded cyclone group feed pressure The force detection meter 10, the overflow return regulating valve 11 of the classified cyclone group, the underflow particle size detector 12 of the classified cyclone group, the underflow concentration meter 13 of the classified cyclone group, the underflow flow meter 14 of the classified cyclone group, the underflow return regulating valve 15 of the classified cyclone group, the clean coal particle size detector 16 of the interference bed separator, the clean coal ash detector 17 of the interference bed separator, the top water flow meter 19, the top water pressure detection meter 20, the tail coal discharge valve 21 of the interference bed separator, the tail coal particle size detector 22 of the interference bed separator, and the tail coal ash detector 23 of the interference bed separator are all connected by wires to the programmable controller 24; the industrial control integrated machine 25 can simultaneously realize the detection data access, detection data analysis, detection method execution, control instruction issuance and front-end display; In this embodiment, the programmable controller 24 is a programmable logic controller (PLC for short). In this embodiment, the industrial control integrated machine 25 is connected to the PLC system via Ethernet, and the TCP / IP protocol is used for data transmission.

[0023] Please refer to Figure 2This embodiment provides a method for automatically controlling the product quality of a coarse coal slime separation link in a coal preparation plant, including controlling the feed concentration, controlling the clean coal yield, and controlling the clean coal ash content or tail coal ash content, as follows: S1. Set the optimal value and threshold of the feed concentration of the interference bed separator, adjust the return flow rate according to the feed concentration detection value, and stabilize the feed concentration of the interference bed separator within the threshold range; S2. Set the top water volume of the interference bed separator according to the feed size and feed flow rate; S3. According to the feed size, clean coal size and tail coal size, the top water volume of the interference bed separator is adjusted, thereby adjusting the clean coal size and / or tail coal size and the clean coal yield; S4. Adjust the set density according to the detected real-time clean coal ash content and tail coal ash content, thereby adjusting the clean coal ash content and / or tail coal ash content.

[0024] See also Figure 3 , S1 specific steps include: S101, setting the optimal value and threshold of the feed concentration of the interference bed separator; S102, reading the real-time feed concentration value of the interference bed separator; S103, comparing with a preset concentration threshold; S104. According to the comparison result, determine the underflow or overflow reflux of the classification cyclone, and control the reflux amount.

[0025] In this embodiment, the concentration threshold value of S103 is set as follows: Assuming that the optimal feed concentration of the interference bed separator is xg / L, the actual feed concentration (i.e., the displayed value of the underflow concentration meter 13 of the grading cyclone group) is yg / L, and the allowable concentration fluctuation threshold is ag / L, then: In this embodiment, the comparison and control method of S104 is as follows: When y is within the threshold range, the underflow reflux regulating valve 15 of the grading cyclone group and the overflow reflux regulating valve 11 of the grading cyclone group both remain in a normally closed state and do not act; When y>x+a, the feed concentration is too high, and the overflow reflux regulating valve 11 of the grading cyclone group is opened to return part of the overflow of the grading cyclone to the coal slime bucket 1, thereby reducing the feed concentration of the grading cyclone group 3, thereby reducing the bottom flow of the grading cyclone group after concentration and classification by the grading cyclone group, that is, the feed concentration of the interference bed separator; When y<xa, the feed concentration is too low, and the reflux regulating valve 15 of the bottom flow of the grading cyclone group is opened to return part of the bottom flow of the grading cyclone group 3 to the coal slurry bucket 1, thereby increasing the feed concentration of the grading cyclone group 3, thereby increasing the bottom flow of the grading cyclone group after concentration and classification by the grading cyclone group, that is, the feed concentration of the interference bed separator; In this embodiment, the calculation method for adjusting the opening of the underflow return regulating valve and the overflow return regulating valve is to set a basic value, an upper limit and a lower limit for the valve opening m (%), which are m0, and During the backflow regulation process, the valve opening is adjusted within the upper and lower limits. The calculation formula is: , k1 in the above formula is the calculation slope. When the return flow is adjusted, the m0 of the underflow return flow and the overflow return flow, and The configuration value can be different.

[0026] In this embodiment, in order to ensure that the actual flow rate of coal slurry water matches the processing capacity of the coal slurry water system, the upper limit of the feed concentration of the grading cyclone group is set. , lower limit and upper limit of feed flow rate , lower limit The regulation of the overflow reflux regulating valve 11 and the underflow reflux regulating valve 15 of the grading cyclone group should ensure that the feed concentration displayed by the grading cyclone group feed concentration meter 8 and the feed flow displayed by the grading cyclone group feed flow meter 9 fluctuate within the threshold range; In this embodiment, the programmable controller 24 automatically controls the number of cyclones in the grading cyclone group to be opened according to the flow detection value of the feed flow meter 9 of the grading cyclone group to adapt to the feed flow of the grading cyclone group and ensure the grading effect of the grading cyclone 3.

[0027] In this embodiment, when the feed concentration meter 8 of the grading cyclone group shows that the feed concentration is higher than the upper limit of the concentration, , while the feed flow meter 9 shows that the feed flow is within the threshold range or the feed concentration meter 8 of the grading cyclone group shows that the feed concentration is within the threshold range, while the feed flow meter 9 shows that the feed flow is lower than the lower limit of the feed flow , the overflow return regulating valve 11 or the underflow return regulating valve 15 of the grading cyclone group is closed, and when the threshold value is not returned to the range after waiting for the time t1, the industrial control integrated machine 25 pushes a pop-up message to remind the upstream desludging link to increase the water spraying amount; In this embodiment, when the feed concentration displayed by the feed concentration meter 8 of the grading cyclone group is lower than the feed concentration lower limit , while the feed flow meter 9 shows the feed flow rate within the threshold range or the feed concentration meter 8 of the grading cyclone group shows the feed concentration within the threshold range, while the feed flow meter 9 shows the feed flow rate higher than the upper limit of the feed flow rate , the overflow return regulating valve 11 or the underflow return regulating valve 15 of the graded cyclone group is closed, and when the waiting time t1 has not returned to the threshold range, the industrial control integrated machine 25 pushes a pop-up message to remind the upstream desludging link to reduce the water spraying amount.

[0028] See also Figure 4 , S2 specific steps include: S201, setting the optimal value and threshold of the feed particle size and feed flow rate of the interference bed separator; S202, reading the real-time feed particle size and feed flow rate of the interference bed separator; S203, comparing with the preset feed particle size ratio and flow rate threshold; S204. According to the comparison result, the top water volume (feedforward) of the interference bed separator is set.

[0029] In this embodiment, the effective feed size of the interference bed separator of S201 is generally 1-0.25 mm, and the feed size is divided into four sizes: +1.0 mm over-limit size, 1-0.5 mm coarse size, 0.5-0.25 mm medium size, -0.25 mm fine size. The optimal proportion and threshold of the preset feed size are as follows: Where: The feed size is 1-0.5mm. The feed size is 0.5-0.25mm. The feed particle size is less than 0.25mm.

[0030] Assume that the optimal feed flow rate of the interference bed separator is Q0 m 3 / h, Q0 matches the diameter of the interference bed separator; the allowable flow fluctuation threshold is set to cm 3 / h, the feed flow rate is Q 入 , then the appropriate feed flow rate is: In this embodiment, S202, reading the feed flow rate of the interference bed separator (the detection value of the underflow concentration meter 13 of the classification cyclone group and the feed particle size of the interference bed separator (the detection value of the underflow particle size detector 12 of the classification cyclone group); In this embodiment, S203 and S204 are compared with the preset value of S201. If the proportion of the over-limit particle size of +1.0 mm is greater than z1, a pop-up message should be pushed to the industrial control integrated machine 25 to remind the upstream link that "running coarse" has occurred; the control method of the top water volume setting is as follows. During the setting process, it is first executed based on the comparison result of the feed flow rate. After the execution is completed, the feed particle size is further compared based on the current flow calculation value, and the comparison result is executed: In the above table: Q d0 is the basic value of topwater volume, Q d1 is the calculation of top water volume based on flow comparison, k2, k3 and k4 are the calculation coefficients 2, 3 and 4 for top water volume adjustment, The feed size is 1-0.5mm. The feed particle size is less than 0.25mm.

[0031] See also Figure 5 , S3 specific steps include: S301, setting the mapping relationship between the feed particle size of the interference bed separator and the clean coal particle size and tail coal particle size; S302, reading the feed particle size, clean coal particle size and tail coal particle size of the interference bed separator detected in real time; S303, comparing with a preset mapping relationship; S304. According to the comparison relationship, adjust the top water volume (feedback) of the interference bed separator.

[0032] In this embodiment, the feed size of S301 accounts for z, and the clean coal size accounts for z j , the tailing coal particle size ratio is z w , the theoretical distribution rate is η, the particle size ratio threshold is Δ, and the mapping relationship between the feed particle size of the interference bed separator and the clean coal particle size and tail coal particle size is established as follows: In this embodiment, the essence of the separation principle of the interference bed separator is to rely on the density difference of the feed for separation. The theoretical distribution rate is calculated based on the feed density composition of the interference bed separator. The distribution rate of each particle size grade is different. Before the next density composition test data comes out, no matter whether the feed property changes or not, the previous calculation result is always used. The granularity ratio threshold Δ set for different granularity levels is different, and it is more reasonable to set it within the range of 10%~30%.

[0033] In this embodiment, the interference bed sorting process of S302 focuses on the particle size proportion of 1-0.5mm coarse particles and -0.25mm fine particles detected by the interference bed sorting machine clean coal particle size detector 16 and the interference bed sorting machine tail coal particle size detector 22.

[0034] In this embodiment, when comparing S303 and S304 with the mapping relationship of the particle size in the above table, the upper limit of the top water volume is set to , the lower limit is ; If the detected 1-0.5mm coarse-grained clean coal particle size ratio is greater than the clean coal particle size ratio threshold of this particle size ratio and the -0.25mm fine-grained clean coal ratio is less than the clean coal particle size ratio threshold of this particle size ratio, it means that the top water volume is too large, then the top water volume is reduced within the top water volume threshold range until the clean coal particle size ratio of this particle size ratio is within the threshold range; If the detected 1-0.5mm coarse-grained clean coal particle size ratio is less than the clean coal particle size ratio threshold of this particle size class and the -0.25mm fine-grained clean coal ratio is greater than the clean coal particle size ratio threshold of this particle size class, it means that the top water volume is too small, then the top water volume is increased within the top water range until it falls within the clean coal particle size ratio threshold range of this particle size class; If the proportion of 1-0.5mm coarse-grained clean coal or the proportion of -0.25mm fine-grained clean coal is not within the threshold range, the top water volume will not be adjusted for the time being.

[0035] See also Figure 6 , S4 specific steps include: S401, setting a clean coal ash target value or a tail coal ash target value for a coarse coal slime separation system; S402, setting a clean coal ash content threshold value and a tail coal ash content threshold value in the production process based on the clean coal ash content target value or the tail coal ash content target value; S403, reading the clean coal ash content detection value and tail coal ash content detection value of the interference bed separator; S404, comparing the detected clean coal ash content and tail coal ash content with the preset clean coal ash content threshold value and tail coal ash content threshold value; S405: Adjust the set density according to the comparison result.

[0036] In this embodiment, the clean coal ash content target value of S401 is A1, the tail coal ash content target value is A2, and the appropriate clean coal ash content is A dj , the tailing ash is divided into A dw ,but: A1-Δ j ×A1≤A dj ≤A1+Δ j ×A1, where the clean coal ash fluctuation threshold Δ j Fluctuations within the range of 3% to 15% are more reasonable; A2-Δ w ×A2≤A dw ≤A2+Δ w ×A2, where the tail coal ash fluctuation threshold Δ w It is more reasonable to fluctuate within the range of 2%~10%.

[0037] In this embodiment, S403 reads the online detection ash content A of the clean coal ash content detector 17 of the interference bed separator. j And interference bed separator tail coal ash detector 23 online detection ash A w ; In this embodiment, S404 and S405, according to the production organization mode of the coal preparation plant, it is determined whether the production organization mode is "keeping clean coal" or "keeping tail coal", and further comparison and adjustment methods are as follows: If clean coal is to be kept, the clean coal ash value A j Compared with the preset suitable clean coal ash content A dj If the clean coal ash value Aj is greater than the preset appropriate clean coal ash value A dj , reduce the set density until it falls within the preset clean coal ash content threshold; if the clean coal ash content value A j Less than the preset suitable clean coal ash content A dj , increase the set density until it falls within the preset clean coal ash content threshold; If the tail coal is to be retained, the ash content of the tail coal to be detected will be A w The preset suitable tailing ash content A dw By comparison, if the tailing ash value is A w Greater than the preset appropriate tailing ash threshold A dw , then the clean coal ash value A j With A dj Compare, if A j If the tail coal ash value is within the threshold range, the set density does not need to be adjusted. Otherwise, the set density is reduced until it falls within the preset tail coal ash threshold. w Less than the preset suitable tailing ash content A dw , increase the set density until it falls within the preset tailing coal ash content threshold.

[0038] In this embodiment, whether it is "keeping the clean coal" or "keeping the tail coal", after increasing / decreasing the top water once or increasing / decreasing the set density once, the online detection data should be re-read and compared and judged again. If it falls within the preset threshold range, the adjustment is completed; otherwise, the adjustment should continue until it finally falls within the preset threshold range.

[0039] The working process is as follows: According to the density composition of the raw coal fed to the interference bed sorter, each target clean coal ash content or target tailing coal ash content corresponds to a theoretical sorting density. Before the next density composition test data comes out, the previous calculation result should always be used regardless of whether the feed properties have changed; at the same time, if the clean coal ash content target value or the tailing coal ash content target value is consistent with that of the previous production shift, the set density and set top water volume of the previous production shift should be used, otherwise the theoretical sorting density and theoretical top water volume should be used.

[0040] A series of parameters are set before starting the machine (if not reset, the previous setting value will be used), including the optimal value and threshold of feed concentration, the optimal value and threshold of feed particle size and feed flow rate, the mapping relationship between feed particle size and concentrate particle size and tailings particle size, the target value of clean coal ash content or tailings ash content, as well as the basic value, upper and lower limits of valve opening, etc.

[0041] The interference bed separator 4 is started remotely or on-site, and the slime water in the slime water bucket 1 is transported to the grading cyclone group 3 through the pipeline by the slime water pump 2. After being concentrated and classified by the grading cyclone group 3, the overflow flows by gravity through the pipeline to the fine slime treatment system, and the bottom flow is tangentially fed into the feeding well of the interference bed separator 4. The circulating water in the top water bucket 5 is transported to the bottom of the top water plate inside the interference bed separator 4 through the pipeline by the top water pump 6 to form an ascending water flow. Under the action of the ascending water flow and its own gravity, the feed forms an interference bed layer in the trough. Under the action of the ascending water flow, the low-density particles move upward, overflow to the overflow trough and are discharged from the overflow port, and the high-density particles move downward and pass through the interference bed layer, concentrate at the bottom of the trough body, and are discharged from the bottom flow port.

[0042] Call the optimal value and threshold of the feed concentration of the interference bed separator 4, read the detection data of the underflow concentration meter 13 of the classification cyclone group, compare the results according to the preset method and control the switch and opening of the overflow reflux regulating valve 11 of the classification cyclone group or the underflow reflux regulating valve 15 of the classification cyclone group, and stabilize the feed concentration of the interference bed separator within the threshold range; By adjusting the reflux flow rate to stabilize the feed concentration process of the interference bed separator 4, the real-time detection data of the feed concentration meter 8 and the feed flow meter 9 of the grading cyclone group will be further read, and compared according to the preset method, and the opening of the overflow reflux regulating valve 11 or the bottom flow reflux regulating valve 15 of the grading cyclone group will be kept unchanged or the valve will be closed, the number of cyclones in the grading cyclone group that are opened will be automatically controlled, or a pop-up window will be pushed on the industrial control integrated machine 25 to remind manual intervention.

[0043] The optimal values ​​and thresholds of the feed particle size and feed flow rate of the interference bed separator 4 are called, the detection data of the bottom flow particle size detector 12 of the grading cyclone group and the bottom flow flow meter 14 of the grading cyclone group are read, the results are compared according to the preset method, and the frequency of the top water pump 6 is adjusted to achieve stability of the top water volume within the threshold range.

[0044] The mapping relationship between the feed particle size of the interference bed separator 4 and the clean coal particle size and tail coal particle size is called up, and the detection data of the grading cyclone bottom flow particle size detector 12, the interference bed separator clean coal particle size detector 16 and the interference bed separator tail coal particle size detector 22 are read. The results are compared according to the preset mapping relationship, and the frequency of the top water pump 6 is adjusted to achieve stability of the top water volume within the threshold range.

[0045] According to the different production organization modes of the coal preparation plant, the clean coal ash target value or the tail coal ash target value of the interference bed separator 4 is called, and the clean coal ash threshold value or the tail coal ash threshold value in the production process is set based on the clean coal ash target value or the tail coal ash target value, and the detection data of the clean coal ash detector 17 of the interference bed separator or the tail coal ash detector 23 of the interference bed separator are compared with the preset clean coal ash threshold value or the tail coal ash threshold value according to the preset method, and the set density is adjusted to stabilize the product indicators within the threshold range.

[0046] In this embodiment, during the production process, based on the detection data of the underflow particle size detector 12 of the grading cyclone group, the underflow concentration meter 13 of the grading cyclone group, the underflow flow meter 14 of the grading cyclone group, the clean coal particle size detector 16 of the interference bed separator, the tail coal particle size detector 22 of the interference bed separator, the clean coal ash detector 17 of the interference bed separator and the tail coal ash detector 23 of the interference bed separator, a single control or different combinations of control including control of feed concentration, control of clean coal yield (clean coal particle size), control of clean coal ash content or tail coal ash content will be automatically triggered and executed according to the preset algorithm.

[0047] In this embodiment, after all the above operations are performed, they will be re-judged according to the preset comparison algorithm. If the threshold range is not reached, it will be adjusted again until the preset indicator reaches the threshold value.

[0048] Embodiment 2: A product quality automatic control system of a coarse coal slime sorting system can realize a product quality automatic control method of a coarse coal slime sorting system described in embodiment 1, comprising: Data acquisition module: obtains the real-time feed concentration value, real-time feed particle size, feed flow rate, clean coal particle size and tail coal particle size of the interference bed separator, as well as the clean coal ash content detection value and tail coal ash content detection value; Backflow control module: the backflow control of the classification cyclone group is carried out based on the real-time feed concentration value of the interference bed separator; Top water volume setting module: the top water volume of the interference bed separator is set based on the real-time feed particle size and feed flow rate of the interference bed separator; Top water volume adjustment module: adjusts the top water volume of the interference bed separator based on the feed size, clean coal size and tail coal size of the interference bed separator; Set density adjustment module: adjust the set density based on the clean coal ash detection value and tail coal ash detection value of the interference bed separator.

[0049] Embodiment three: The embodiment of the present invention further provides a product quality automatic control device of a coarse coal slime sorting system, which can realize the product quality automatic control method of a coarse coal slime sorting system described in the first embodiment, 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 perform the steps of the following method: Obtain the real-time feed concentration value, real-time feed particle size, feed flow rate, clean coal particle size and tail coal particle size of the interference bed separator, as well as the clean coal ash content detection value and tail coal ash content detection value; The return flow rate of the classifying cyclone group is controlled based on the real-time feed concentration value of the interference bed separator; The top water volume of the interference bed separator is set based on the real-time feed size and feed flow rate of the interference bed separator; Adjust the top water volume of the interference bed separator based on the feed size, clean coal size and tail coal size of the interference bed separator; The set density is adjusted based on the clean coal ash content test value and the tail coal ash content test value of the interference bed separator.

[0050] Embodiment 4: The embodiment of the present invention further provides a computer-readable storage medium, which can implement the method for automatically controlling product quality of a coarse coal slime sorting system described in the first embodiment, and stores a computer program thereon, which implements the steps of the following method when executed by a processor: Obtain the real-time feed concentration value, real-time feed particle size, feed flow rate, clean coal particle size and tail coal particle size of the interference bed separator, as well as the clean coal ash content detection value and tail coal ash content detection value; The return flow rate of the classifying cyclone group is controlled based on the real-time feed concentration value of the interference bed separator; The top water volume of the interference bed separator is set based on the real-time feed size and feed flow rate of the interference bed separator; Adjust the top water volume of the interference bed separator based on the feed size, clean coal size and tail coal size of the interference bed separator; The set density is adjusted based on the clean coal ash content test value and the tail coal ash content test value of the interference bed separator.

[0051] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

[0052] It should be understood by those skilled in the art that the embodiments of the present invention may be provided as methods, systems or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware aspects. Moreover, the present invention may take the form of a computer program product implemented 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.

[0053] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the process in the flowchart. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0054] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0055] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for automatically controlling product quality of a coarse coal slime sorting system, characterized in that: include: Obtain the real-time feed concentration value, real-time feed particle size, feed flow rate, clean coal particle size and tail coal particle size of the interference bed separator, as well as the clean coal ash content detection value and tail coal ash content detection value; The return flow rate of the classifying cyclone group is controlled based on the real-time feed concentration value of the interference bed separator; The top water volume of the interference bed separator is set based on the real-time feed size and feed flow rate of the interference bed separator; Adjust the top water volume of the interference bed separator based on the feed size, clean coal size and tail coal size of the interference bed separator; The set density is adjusted based on the clean coal ash content test value and the tail coal ash content test value of the interference bed separator.

2. The method for automatically controlling product quality of a coarse coal slime separation system according to claim 1, characterized in that: The return flow of the classifying cyclone group is controlled based on the real-time feed concentration value of the interference bed separator, including: Set the feed concentration range of the interference bed separator; Compare the real-time feed concentration value of the interference bed separator with the feed concentration range; In response to the real-time feed concentration value of the interference bed separator being within the feed concentration range, the underflow reflux regulating valve of the grading cyclone group and the overflow reflux regulating valve of the grading cyclone group are controlled to remain in a normally closed state; In response to the real-time feed concentration value of the interference bed separator being higher than the feed concentration range, the overflow reflux regulating valve of the grading cyclone group is opened to return a part of the overflow of the grading cyclone to the coal slime bucket, thereby reducing the feed concentration of the grading cyclone group and thus reducing the feed concentration of the interference bed separator; In response to the real-time feed concentration value of the interference bed separator being lower than the feed concentration range, the underflow reflux regulating valve of the grading cyclone group is opened to return part of the underflow of the grading cyclone to the coal slime bucket, thereby increasing the feed concentration of the grading cyclone group and thus increasing the feed concentration of the interference bed separator.

3. The method for automatically controlling product quality of a coarse coal slime sorting system according to claim 2, characterized in that: The calculation method for adjusting the opening of the underflow reflux regulating valve of the grading cyclone group and the overflow reflux regulating valve of the grading cyclone group is as follows: a basic value, an upper limit and a lower limit are set for the valve opening, and the valve opening is adjusted within the upper and lower limits during the reflux flow adjustment process. The calculation formula is: Where: m is the valve opening, m0 is the basic value of the valve opening, is the upper limit of valve opening, is the lower limit of valve opening, k1 is the calculation slope, y is the actual feed concentration of the interference bed separator, and x is the optimal feed concentration of the interference bed separator.

4. The method for automatically controlling product quality of a coarse coal slime sorting system according to claim 3 is characterized in that: During the valve opening adjustment process: In response to the feed concentration of the grading cyclone group being higher than the preset upper limit or the feed flow rate being lower than the preset lower limit, the overflow reflux regulating valve and the underflow reflux regulating valve of the grading cyclone group are closed, and when the set time has not returned to the threshold range, a pop-up message is pushed to remind the upstream desludging link to increase the water spraying amount; In response to the feed concentration of the grading cyclone group being lower than the preset lower limit or the feed flow rate being higher than the preset upper limit, the overflow reflux regulating valve and the underflow reflux regulating valve of the grading cyclone group are closed, and when the set waiting time has not returned to the threshold range, a pop-up message is pushed to remind the upstream desludging link to reduce the amount of water sprayed; The number of opened cyclones in the grading cyclone group is adapted to the feed flow rate of the grading cyclone group and is automatically controlled according to the real-time feed concentration and feed flow rate of the grading cyclone group.

5. The method for automatically controlling product quality of a coarse coal slime sorting system according to claim 1, characterized in that: The top water volume of the interference bed separator is set based on the real-time feed size and feed flow of the interference bed separator, including: Set the threshold range of the feed size and feed flow rate of the interference bed separator; Compare the real-time feed size and feed flow rate of the interference bed separator with the threshold range; In response to the feed flow rate being within a threshold range, setting the top water volume as a basic value; In response to the feed flow rate exceeding the threshold range, the top water volume is set to , Q d0 is the basic value of top water volume, k2 is the calculation coefficient 2 for top water volume adjustment, is the feed flow rate; in response to the feed particle size of 1-0.5mm exceeding the threshold range, the top water volume is set to , Q d1 is the calculation of top water volume based on flow comparison, k3 is the calculation coefficient three for top water volume adjustment, The feed size is 1-0.5 mm, and z2 is the optimal proportion under the particle size of 1-0.5 mm; In response to the feed size less than 0.25 mm exceeding the threshold range, the top water volume is set to , Q d1 is the calculation of top water volume based on flow comparison, k4 is the calculation coefficient of top water volume adjustment, The feed particle size is less than 0.25 mm, and z4 is the optimal proportion under the particle size of less than 0.25 mm.

6. The method for automatically controlling product quality of a coarse coal slime sorting system according to claim 1, characterized in that: The top water volume of the interference bed separator is adjusted based on the feed size, clean coal size and tail coal size of the interference bed separator, including: Set the mapping relationship between the feed size of the interference bed separator and the clean coal size and tail coal size; Compare the feed size, clean coal size and tail coal size of the interference bed separator with the preset mapping relationship; In response to the fact that the clean coal particle size ratio of the 1-0.5 mm coarse particle size class is greater than the clean coal particle size ratio threshold of the particle size class and the clean coal particle size ratio of the fine particle size class less than 0.25 mm is less than the clean coal particle size ratio threshold of the particle size class, it is determined that the top water volume is too large, and the top water volume is reduced within the top water volume threshold range until the clean coal particle size ratio falling into the particle size class is within the threshold range; In response to the fact that the clean coal particle size ratio of the 1-0.5 mm coarse particle size class is less than the clean coal particle size ratio threshold of the particle size class and the clean coal particle size ratio of the fine particle size class less than 0.25 mm is greater than the clean coal particle size ratio threshold of the particle size class, it is determined that the top water amount is too small, and the top water is increased within the top water range until it falls within the clean coal particle size ratio threshold range of the particle size class; In response to the fact that the proportion of the coarse-grained clean coal of 1-0.5 mm or the proportion of the fine-grained clean coal of less than 0.25 mm is not within the threshold range, the top water amount is not adjusted.

7. The method for automatically controlling product quality of a coarse coal slime sorting system according to claim 1, characterized in that: Adjust the set density based on the clean coal ash test value and tail coal ash test value of the interference bed separator, including: Set the clean coal ash target value A1 or tail coal ash target value A2 of the coarse coal slime separation system; Based on the clean coal ash target value A1 or the tail coal ash target value A2, the appropriate clean coal ash content in the production process is set as A dj And the appropriate tailing ash is divided into A dw , where: A1-Δ j ×A1≤A dj ≤A1+Δ j ×A1,Δ j is the fluctuating threshold of clean coal ash content, A2-Δ w ×A2≤A dw ≤A2+Δ w ×A2,Δ w is the fluctuation threshold of tail coal ash content; The clean coal ash content detection value A j And tail coal ash content detection value A w With appropriate clean coal ash is divided into A dj And the appropriate tailing ash is divided into A dw Make comparisons and judge the way production is organized; In response to the production organization mode of preserving clean coal, the clean coal ash value A j Compared with the preset suitable clean coal ash content A dj If the clean coal ash value Aj is greater than the preset appropriate clean coal ash value Aj, dj , reduce the set density until it falls within the preset clean coal ash content threshold; if the clean coal ash content value A j Less than the preset suitable clean coal ash content A dj , increase the set density until it falls within the preset clean coal ash content threshold; In response to the production organization mode of preserving tailing coal, the detected tailing coal ash value A w The preset suitable tailing ash content A dw By comparison, if the tailing ash value is A w Greater than the preset appropriate tailing ash threshold A dw , then the clean coal ash value A j With A dj Compare, if A j If the tail coal ash value is within the threshold range, the set density will not be adjusted. Otherwise, the set density will be reduced until it falls within the preset tail coal ash content threshold. w Less than the preset suitable tailing ash content A dw , increase the set density until it falls within the preset tailing coal ash content threshold.

8. A product quality automatic control system for a coarse coal slime sorting system, characterized in that: include: Data acquisition module: obtains the real-time feed concentration value, real-time feed particle size, feed flow rate, clean coal particle size and tail coal particle size of the interference bed separator, as well as the clean coal ash content detection value and tail coal ash content detection value; Backflow control module: the backflow control of the classification cyclone group is carried out based on the real-time feed concentration value of the interference bed separator; Top water volume setting module: the top water volume of the interference bed separator is set based on the real-time feed particle size and feed flow rate of the interference bed separator; Top water volume adjustment module: adjusts the top water volume of the interference bed separator based on the feed size, clean coal size and tail coal size of the interference bed separator; Set density adjustment module: adjust the set density based on the clean coal ash detection value and tail coal ash detection value of the interference bed separator.

9. An automatic product quality control device for a coarse coal slime sorting system, 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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