Efficient wet dust removal system for recovering zinc suboxide from flue gas

Abstract

This invention discloses a high-efficiency wet dust removal system for recovering zinc oxide from flue gas, comprising a Venturi dust collector, a spray mixing chamber connected to the side of the Venturi dust collector, a flue gas inlet at the top of the spray mixing chamber, and a flue gas outlet at the top of the Venturi dust collector; a first drain port at the bottom of the Venturi dust collector, which is directly connected to a thickener via a pipe and a first drain pump; a central drain port at the middle of the Venturi dust collector, connected to a circulation pipe, the end of which is connected to the inlet pipe of an atomizer; and a conical liquid collection device at the bottom of the spray mixing chamber. The system also includes an online concentration monitoring unit, a liquid level monitoring unit, an anti-clogging cleaning mechanism, and an intelligent controller. This system can monitor and actively regulate the concentration of the circulating slurry in real time and effectively prevent clogging caused by ash accumulation at the bottom of the spray mixing chamber.

Description

Technical Field

[0001] This invention patent belongs to the field of pyrometallurgical flue gas treatment technology, specifically relating to a high-efficiency wet dust removal system for recovering zinc oxide from flue gas. Background Technology

[0002] In pyrometallurgical lead smelting processes (such as the Kifset furnace process), the resulting high-temperature slag needs to be treated in a fuming furnace. Through reduction, volatilization, and re-oxidation processes, the zinc in the slag is recovered in the form of zinc oxide (mainly ZnO). The flue gas generated in this process is high in temperature and dust content, and contains valuable metals. Therefore, it needs to be separated into gas and solid gases by a dust removal system to achieve resource recovery.

[0003] In the prior art, Chinese invention patent CN117443108A discloses a wet dust removal system for recovering zinc oxide from flue gas. The system mainly comprises a Venturi dust collector and a spray mixing chamber, which collects dust through atomized droplets. The improvement lies in directly connecting the first drain port at the bottom of the Venturi dust collector to a thickener via a drain pump, and opening a middle drain port connected to a circulation pipe in the middle of the collector. Simultaneously, a conical collection device and a second drain port are installed at the bottom of the spray mixing chamber. This scheme, through staged drainage, aims to reduce the concentration of the circulating slurry and prevent clogging.

[0004] However, in practical industrial applications, especially when dealing with high-concentration flue gas or system load fluctuations, the above-mentioned solutions still have the following technical bottlenecks: First, although a central drain port is set up, the slurry concentration control in the circulation pipe depends on the continuous replenishment of the second replenishment pipe. The control method is relatively passive and has a lag. Once the replenishment is not timely or the incoming material concentration changes abruptly, the atomizer is still at risk of clogging, resulting in uneven atomized particle size distribution and reduced dust removal efficiency. Second, the conical liquid collection device at the bottom of the spray mixing chamber relies solely on gravity for liquid drainage. For materials like zinc oxide slurry with specific crystallization characteristics (easily precipitating crystals at specific temperatures and concentrations), the second drain port is very prone to clogging, causing high-concentration slurry to accumulate in the mixing chamber. This not only affects the flue gas flow cross section but also causes the atomizer nozzle to be submerged due to the rising liquid level, resulting in equipment damage. Third, the existing solutions lack a real-time monitoring and collaborative control mechanism for key parameters within the system, making it impossible to achieve stable and efficient operation of the system over a long period without human intervention.

[0005] Therefore, there is an urgent need for a wet dust removal system and intelligent control method that can monitor and actively regulate the concentration of circulating slurry in real time, while effectively preventing ash accumulation and blockage at the bottom of the spray mixing chamber. Summary of the Invention

[0006] To address the aforementioned problems, this invention aims to provide a highly efficient wet dust removal system for recovering zinc oxide from flue gas. This system can monitor and actively regulate the concentration of the circulating slurry in real time and effectively prevent ash accumulation at the bottom of the spray mixing chamber from causing blockage.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a high-efficiency wet dust removal system for recovering zinc oxide from flue gas, comprising a Venturi dust collector, a spray mixing chamber connected to the side of the Venturi dust collector, a flue gas inlet at the top of the spray mixing chamber, and a flue gas outlet at the top of the Venturi dust collector; the middle of the Venturi dust collector is connected to a first replenishment pipe, and the bottom of the Venturi dust collector has a first drain port, which is directly connected to a thickener via a pipe and a first drain pump; the Venturi dust collector... A central drain outlet is provided at the middle position, connected to a circulation pipe. A second circulation pump is installed on the circulation pipe, which is also connected to a second replenishment pipe. The end of the circulation pipe is connected to an atomizer inlet pipe, which is connected to an atomizer located within the spray mixing chamber. A conical liquid collecting device is provided at the bottom of the spray mixing chamber, with a second drain outlet at its bottom. This second drain outlet is connected to a slurry discharge pipe, the end of which is connected to a dust slurry tank. The system also includes: An online concentration monitoring unit includes an online concentration detector installed on the circulation pipe for real-time monitoring of the concentration of the circulating slurry; The liquid level monitoring unit includes a liquid level gauge installed on the side wall of the Venturi dust collector for real-time monitoring of the slurry liquid level inside the Venturi dust collector. An anti-clogging and dust removal mechanism is installed inside the conical liquid collection device, including a rotating shaft, a drive motor, and a scraper assembly. The rotating shaft is vertically installed at the center of the conical liquid collection device, with its upper end extending out of the conical liquid collection device and connected to the output end of the drive motor. The scraper assembly includes a scraper that fits against the inclined inner wall of the conical liquid collection device, and the scraper is fixedly connected to the rotating shaft via a connecting rod. The intelligent controller is connected to the online concentration monitoring unit, the liquid level monitoring unit, the automatic regulating valve installed on the second replenishment pipe, the first drain pump, the second circulation pump, and the drive motor.

[0008] Furthermore, the concentration detector is an online slurry density meter or an ultrasonic concentration meter.

[0009] Furthermore, the number of scraper assemblies is at least two sets, which are evenly distributed circumferentially along the rotation axis; a wear-resistant rubber pad is provided on the side of the scraper that contacts the inclined inner wall of the conical liquid collection device.

[0010] Furthermore, the vertical opening height of the central drain outlet is higher than 1 / 2 of the total height of the Venturi dust collector.

[0011] Furthermore, the slurry discharge pipe is also equipped with a flushing water pipe interface, and the flushing water pipe interface is equipped with a flushing valve that is connected to the intelligent controller via a signal.

[0012] The present invention also provides a wet dust control method for recovering zinc oxide from flue gas based on the above system, specifically including the following steps: S1. Data Acquisition: The intelligent controller receives the circulating slurry concentration signal C(t) from the online concentration monitoring unit and the liquid level signal L(t) from the liquid level monitoring unit in real time; S2, Concentration Control: The intelligent controller compares the real-time concentration C(t) with a preset first upper limit threshold C_max1 and a second upper limit threshold C_max2, where C_max1 < C_max2; When C(t) > C_max1 and C(t) ≤ C_max2, the controller controls the automatic regulating valve to increase the opening, increasing the amount of liquid replenished by the second replenishment pipe, and at the same time adjusts the speed of the second circulation pump to dilute the circulating slurry; When C(t) > C_max2, the controller determines that there is a risk of blockage in the system. At the same time as starting the above liquid replenishment program, it triggers the anti-blockage cleaning mechanism to start and issues a warning signal. S3, Coordinated control of liquid level and drainage: The intelligent controller compares the real-time liquid level L(t) with the preset safe liquid level upper limit L_max; When L(t) > L_max, the controller increases the discharge frequency or power of the first discharge pump to speed up the discharge of the high-concentration slurry at the bottom of the Venturi dust collector to the thickener; at the same time, the controller correlates the concentration data in step S2. If C(t) is also higher than C_max1 at this time, the controller further increases the replenishment volume of the first replenishment pipe to quickly reduce the bottom slurry concentration and liquid level. S4. Intermittent operation control of the anti-clogging dust removal mechanism: The intelligent controller starts the drive motor according to the preset time period T, or according to the trigger signal C(t) > C_max2 in step S2, and drives the scraper assembly to scrape the inner wall of the conical liquid collection device. Each run takes t. After the run is completed, the controller detects the flow rate or pressure downstream of the second drain port to determine whether the drain is unobstructed. If a blockage is detected, the controller controls the flushing valve to open for backwashing.

[0013] Furthermore, in step S4, the preset time period T is dynamically adjusted based on the dust content of the flue gas or historical operating data.

[0014] Advantages of the present invention: Through the collaborative cooperation of the online concentration monitoring unit and the intelligent controller, the present invention realizes the real-time perception and active regulation of the concentration of the circulating slurry, breaking through the limitations of passive liquid replenishment and lagging regulation in traditional technologies. When the concentration exceeds the first threshold, the system can automatically increase the liquid replenishment amount and adjust the rotational speed of the circulating pump for dilution; when the concentration exceeds the second threshold, the system synchronously starts the anti-blocking and dust cleaning mechanism and issues an early warning, forming a closed-loop control mechanism of "monitoring - judgment - execution - early warning", effectively avoiding the problem of atomizer blockage caused by sudden changes in concentration, and ensuring the stability of the atomization particle size and the dust removal efficiency.

[0015] Aiming at the technical problem that the conical liquid collection device at the bottom of the spray mixing chamber is prone to blockage, the present invention innovatively sets an anti-blocking and dust cleaning mechanism. The driving motor drives the rotating shaft and the scraper assembly to periodically sweep the conical inner wall. With the design of the wear-resistant rubber gasket, it effectively removes the wall deposits while reducing the mechanical damage to the equipment. The multi-group circumferential uniform distribution design of the scraper assembly ensures the integrity of the sweeping coverage. The intelligent controller's linkage monitoring of the sweeping cycle, operation duration, and downstream liquid drainage status realizes the precision and intelligence of the dust cleaning operation, significantly reducing the blockage probability of the second liquid drainage port and avoiding the adverse effects of high-concentration slurry accumulation on the flue gas flow and the safe operation of the atomizer.

[0016] In addition, through the collaborative control of the liquid level monitoring unit, the first liquid drainage pump, and the first liquid replenishment pipe, the present invention constructs a dual-parameter coupling regulation strategy for liquid level and concentration. When the liquid level exceeds the safety upper limit, the system not only accelerates the discharge of the high-concentration slurry at the bottom but also dynamically adjusts the liquid replenishment strategy in combination with the real-time concentration data, realizing the global optimization of the slurry state in the Venturi dust collector. The setting of the flushing valve on the slurry discharge pipe and the introduction of the backwashing function further strengthen the self-cleaning ability and operation reliability of the system.

[0017] In summary, through the system architecture of multi-parameter real-time monitoring and multi-execution mechanism intelligent linkage, the present invention realizes the long-term stable operation of the secondary zinc oxide wet dust removal process, significantly improves the automation level and anti-interference ability of the system, and has important industrial application value for the efficient recovery of valuable metals in the flue gas of pyrometallurgy. Brief Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Those skilled in the art can also obtain other drawings based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic structural diagram of the high-efficiency wet dust removal system for recovering secondary zinc oxide in the flue gas in the embodiment of the present invention; Figure 2 This is a logic flowchart of the control method of the present invention.

[0020] The attached diagram lists the components represented by each number as follows: 1. Venturi dust collector; 2. Spray mixing chamber; 3. Flue gas inlet; 4. Flue gas outlet; 5. First replenishment pipe; 6. First drain outlet; 7. First drain pump; 8. Thickener; 9. Circulation pipe; 10. Second circulation pump; 11. Second replenishment pipe; 12. Atomizer inlet pipe; 13. Atomizer; 14. Conical liquid collection device; 15. Second drain outlet; 16. Slurry discharge pipe; 17. Dust slurry tank; 18. Concentration detector; 19. Automatic regulating valve; 20. Rotary shaft; 21. Drive motor; 22. Scraper; 23. Connecting rod; 24. Wear-resistant rubber gasket; 25. Level gauge; 26. Intelligent controller; 27. Flushing valve. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. Example 1

[0022] like Figure 1 As shown, this embodiment provides a high-efficiency wet dust removal system for recovering zinc oxide from flue gas, the main structure of which is an improvement based on prior art document 1 (CN117443108A). The system includes a Venturi dust collector 1 and a spray mixing chamber 2 connected to its side. The spray mixing chamber 2 has a flue gas inlet 3 at the top, and the Venturi dust collector 1 has a flue gas outlet 4 at the top.

[0023] The middle part of the Venturi dust collector 1 is connected to the first replenishment pipe 5 for replenishing process water. The bottom of the Venturi dust collector 1 is provided with a first drain port 6, which is directly connected to the thickener 8 through a pipe and a first drain pump 7, so that the high-concentration bottom slurry is directly transported to the thickener 8 for sedimentation and concentration.

[0024] A central drain port is located at the middle of the Venturi dust collector 1 (preferably above half its total height), and this port is connected to a circulation pipe 9. A second circulation pump 10 is installed on the circulation pipe 9 and is connected to a second replenishment pipe 11 to replenish low-concentration liquid to adjust the concentration of the circulating liquid. The end of the circulation pipe 9 is connected to the atomizer inlet pipe 12, and then to the atomizer 13 located in the spray mixing chamber 2, so that the circulating liquid is atomized and used to capture dust in the flue gas.

[0025] The bottom of the spray mixing chamber 2 is equipped with a conical liquid collection device 14 for collecting the high-concentration slurry that settles there. The bottom of the conical liquid collection device 14 has a second drain port 15, which is connected to the dust slurry tank 17 through a slurry discharge pipe 16.

[0026] The core improvement of this invention lies in the addition of an online concentration monitoring unit, a liquid level monitoring unit, an anti-clogging and dust removal mechanism, and an intelligent controller, and a collaborative control method is constructed based on these.

[0027] like Figure 1 As shown, the online concentration monitoring unit includes an online concentration detector 18 (an online slurry density meter is used in this embodiment) installed on the circulation pipe 9. The liquid level monitoring unit includes a liquid level gauge 25 installed on the side wall of the Venturi dust collector 1.

[0028] like Figure 1 As shown, the anti-clogging and dust-removing mechanism is disposed within the conical liquid collection device 14. This mechanism includes a rotating shaft 20, a drive motor 21, and a scraper assembly. The rotating shaft 20 is vertically installed at the central axis of the conical liquid collection device 14, with its upper end passing through the top of the conical liquid collection device 14 via a sealed bearing, and mechanically connected to the output end of the drive motor 21 fixed above it. The scraper assembly includes at least two sets (two sets in this embodiment) of scrapers 22 evenly distributed circumferentially along the rotating shaft 20. The scrapers 22 are fixedly connected to the rotating shaft 20 via connecting rods 23, and the outer edge of the scrapers 22 is completely fitted to the inclined inner wall of the conical liquid collection device 14. A wear-resistant rubber pad 24 is fixedly provided on the side of the scraper 22 that contacts the inner wall.

[0029] The intelligent controller 26 (which can be a PLC or DCS system) is connected to the concentration detector 18, the level gauge 25, the automatic regulating valve 19 installed on the second replenishment pipe 11, the first discharge pump 7, the second circulation pump 10, and the drive motor 21. The slurry discharge pipe 16 is also equipped with a flushing water pipe interface and a flushing valve 27, which is also connected to the intelligent controller 26.

[0030] The control method and synergistic principle of the present invention are as follows (in combination with...) Figure 2 ): S1. Data Acquisition: The intelligent controller 26 receives the concentration signal C(t) and the liquid level signal L(t) in real time.

[0031] S2. Active Concentration Control: The controller compares C(t) with preset thresholds (e.g., C_max1 = 40%, C_max2 = 50%). When C(t) exceeds C_max1, the automatic regulating valve 19 opens wider to increase liquid replenishment. If C(t) continues to rise and exceeds C_max2, it indicates that the atomizer 13 is at risk of clogging. The controller immediately activates the anti-clogging cleaning mechanism (drives the motor 21) for preventative cleaning and issues a warning. This concentration-cleaning linkage mechanism changes the passive liquid replenishment and clogging-only-handling mode in Comparative Document 1, enabling early intervention against risks.

[0032] S3. Liquid Level and Drainage Synergy: When L(t) exceeds the safe liquid level L_max, the controller increases the power of the first drainage pump 7 for rapid drainage. If C(t) is also high at this time, the replenishment volume of the first replenishment pipe 5 is increased simultaneously, forming a synergistic "rapid drainage + rapid replenishment" mode to quickly replace the high-concentration slurry in the dead zone at the bottom of the Venturi dust collector 1 and prevent scale buildup at the bottom.

[0033] S4. Intelligent Anti-clogging and Dust Removal: The controller drives the scraper 22 to rotate and scrape according to the time period T (e.g., running for 10 minutes every 2 hours) or the high concentration trigger signal in S2. After operation, the controller detects the flow rate or pressure of the slurry discharge pipe 16 to determine whether the discharge is unobstructed. If a blockage is detected, the flushing valve 27 is automatically opened for backwashing, realizing self-verification and self-repair of the dust removal effect.

[0034] Through the synergy of the above four steps, this invention integrates concentration control, liquid level control, and dust removal operation into an organic whole, realizing adaptive adjustment of the system under multiple operating conditions and significantly improving the system's stability, reliability, and automation level.

[0035] The working principle of this invention is as follows: High-temperature flue gas containing zinc oxide enters the spray mixing chamber 2 from the flue gas inlet 3, and comes into full contact with the atomized droplets sprayed by the atomizer 13. Dust particles in the flue gas are captured by the droplets and undergo inertial collision, interception, and coagulation to form a dust-laden slurry. Most of the dust-laden slurry falls into the conical liquid collection device 14 at the bottom of the spray mixing chamber 2 under the action of gravity, and is discharged into the dust slurry tank 17 for further treatment through the second drain port 15 and the slurry discharge pipe 16. A small amount of fine slurry carried by the airflow enters the Venturi dust collector 1, where it is further mixed with the replenished liquid and captured under the action of the Venturi effect.

[0036] During system operation, the circulating slurry in the middle of the Venturi dust collector 1 is transported to the atomizer 13 for recycling via the circulation pipe 9 under the action of the second circulation pump 10. A concentration detector 18 installed on the circulation pipe 9 monitors the slurry concentration in real time. When the concentration rises to the first threshold, the intelligent controller 26 automatically increases the replenishment volume of the second replenishment pipe 11 to dilute the circulating slurry and maintain the stable operation of the atomizer 13. If the concentration continues to rise to the second threshold, the anti-clogging and dust removal mechanism is triggered, and an early warning is issued to remind the operator to pay attention to changes in the incoming material conditions. The level gauge 25 at the bottom of the Venturi dust collector 1 continuously monitors the slurry level. When the level approaches the safe upper limit, the controller coordinates to increase the discharge capacity of the first discharge pump 7 and the replenishment volume of the first replenishment pipe 5, forming a rapid replacement and preventing high-concentration slurry from depositing and scaling at the bottom.

[0037] For the zinc oxide slurry within the conical collection device 14, the intelligent controller 26 activates the drive motor 21 according to a preset cycle or a high-concentration trigger signal, driving the rotating shaft 20 and scraper 22 to continuously scrape the inner wall. The wear-resistant rubber liner 24 effectively removes the attached crystal deposits while protecting the conical wall surface. After scraping, the system verifies the cleaning effect by monitoring the flow state of the slurry discharge pipe 16. If drainage is obstructed, the flushing valve 27 is automatically opened for hydraulic backwashing to ensure that the second discharge port 15 remains unobstructed. This closed-loop control mechanism of monitoring-regulation-cleaning-verification enables the system to maintain stable operation over a long period under fluctuating zinc oxide flue gas conditions, significantly reducing the frequency of manual intervention and equipment failure rate.

[0038] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-efficiency wet dust removal system for recovering zinc oxide from flue gas, comprising a Venturi dust collector (1), wherein a spray mixing chamber (2) is provided on the side of the Venturi dust collector (1), a flue gas inlet (3) is provided at the top of the spray mixing chamber (2), and a flue gas outlet (4) is provided at the top of the Venturi dust collector (1); the middle part of the Venturi dust collector (1) is connected to a first replenishment pipe (5), and the bottom of the Venturi dust collector (1) is provided with a first drain port (6), which is directly connected to a thickener (8) through a pipe and a first drain pump (7); a middle drain port is also provided in the middle part of the Venturi dust collector (1), and the middle drain port is provided with a central drain port. A circulation pipe (9) is connected to the port, and a second circulation pump (10) is provided on the circulation pipe (9). The circulation pipe (9) is also connected to a second replenishment pipe (11). The end of the circulation pipe (9) is connected to the atomizer inlet pipe (12), and the atomizer inlet pipe (12) is connected to the atomizer (13) located in the spray mixing chamber (2). A conical liquid collecting device (14) is provided at the bottom of the spray mixing chamber (2). A second drain port (15) is opened at the bottom of the conical liquid collecting device (14). The second drain port (15) is connected to a slurry discharge pipe (16), and the end of the slurry discharge pipe (16) is connected to a dust slurry tank (17). The feature is that... The system also includes: The concentration online monitoring unit includes an online concentration detector (18) installed on the circulation tube (9); The liquid level monitoring unit includes a liquid level gauge (25) disposed on the side wall of the Venturi dust collector (1). The anti-clogging and dust removal mechanism is installed inside the conical liquid collection device (14) and includes a rotating shaft (20), a drive motor (21), and a scraper assembly. The rotating shaft (20) is vertically installed at the center of the conical liquid collection device (14), and its upper end extends out of the conical liquid collection device (14) and is connected to the output end of the drive motor (21). The scraper assembly includes a scraper (22) that fits against the inclined inner wall of the conical liquid collection device (14). The scraper (22) is fixedly connected to the rotating shaft (20) through a connecting rod (23). The intelligent controller (26) is connected to the concentration online monitoring unit, the liquid level monitoring unit, the automatic regulating valve (19) set on the second replenishment pipe (11), the first drain pump (7), the second circulation pump (10) and the drive motor (21) respectively.

2. The high-efficiency wet dust removal system for recovering zinc oxide from flue gas according to claim 1, characterized in that, The concentration detector (18) is an online slurry density meter or an ultrasonic concentration meter.

3. The high-efficiency wet dust removal system for recovering zinc oxide from flue gas according to claim 1, characterized in that, The number of scraper assemblies is at least two sets, which are evenly distributed around the circumference of the rotating axis (20); a wear-resistant rubber pad (24) is provided on the side of the scraper (22) that contacts the inner wall slope of the conical liquid collection device (14).

4. The high-efficiency wet dust removal system for recovering zinc oxide from flue gas according to claim 1, characterized in that, The vertical opening height of the central drain outlet is higher than 1 / 2 of the total height of the Venturi dust collector (1).

5. The high-efficiency wet dust removal system for recovering zinc oxide from flue gas according to claim 1, characterized in that, The slurry discharge pipe (16) is also provided with a flushing water pipe interface and a flushing valve (27), and the flushing valve (27) is connected to the intelligent controller (26) via signal.

6. A wet dust control method for recovering zinc oxide from flue gas based on the system described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Data acquisition: The intelligent controller (26) receives the circulating slurry concentration signal C(t) from the online concentration monitoring unit and the liquid level signal L(t) from the liquid level monitoring unit in real time; S2, Concentration control: The intelligent controller (26) compares the real-time concentration C(t) with the preset first concentration upper limit threshold C_max1 and the second concentration upper limit threshold C_max2, where C_max1 < C_max2; When C(t) > C_max1 and C(t) ≤ C_max2, the controller controls the automatic regulating valve (19) to increase the opening, increase the amount of liquid replenished by the second replenishment pipe (11), and at the same time adjusts the speed of the second circulation pump (10) to dilute the circulating slurry; When C(t) > C_max2, the controller triggers the anti-clogging and dust removal mechanism to start and issues a warning signal at the same time as starting the above liquid replenishment program; S3, Liquid level and drainage coordinated control: The intelligent controller (26) compares the real-time liquid level L(t) with the preset safe liquid level upper limit L_max; When L(t) > L_max, the controller increases the discharge frequency or power of the first discharge pump (7) to accelerate the discharge of the high-concentration slurry at the bottom of the Venturi dust collector (1) to the thickener (8); at the same time, if C(t) is also higher than C_max1 at this time, the controller further increases the amount of liquid replenished by the first replenishment pipe (5); S4. Intermittent operation control of the anti-clogging and dust removal mechanism: The intelligent controller (26) controls the drive motor (21) to start according to the preset time period T, or according to the trigger signal of C(t) > C_max2 in step S2, so as to drive the scraper assembly to scrape the inner wall of the conical liquid collection device (14).

7. The wet dust control method for recovering zinc oxide from flue gas according to claim 6, characterized in that, In step S4, after the scraping operation is completed, the intelligent controller (26) detects the flow rate or pressure downstream of the second drain port (15). If it is determined that the draining is not smooth, it controls the flushing valve (27) to open for backwashing.

8. The wet dust control method for recovering zinc oxide from flue gas according to claim 6, characterized in that, In step S4, the preset time period T is dynamically adjusted based on the dust content of the flue gas or historical operating data.

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