A wet dust collector with self-circulation spraying

Abstract

The utility model relates to the technical field of circulating spray wet dust collector, especially relates to a wet dust collector with self -circulation spray. Including washing tower, sewage pool and circulating pool, the upper end of washing tower is provided with the smoke outlet, the upper end arc surface of washing tower is provided with the air inlet pipeline, the arc surface of washing washing tower is installed with the access hole, the bottom end one side of washing tower is fixedly connected with the smoke inlet pipeline, the bottom end of washing tower and the inner wall of sewage pool are fixedly connected, one side of sewage pool and one side of circulating pool are fixedly connected, the bottom end one side of circulating pool and sewage pool all is provided with the blow -off port, the upper end of circulating pool is installed with circulating water pump, the output of circulating water pump is installed with the water delivery pipe, the position of water delivery pipe corresponding the smoke inlet pipeline is provided with second spray pipe, the position of water delivery pipe corresponding the both ends in washing tower is provided with first spray pipe and third spray pipe respectively. The wet dust collector with self -circulation spray has the advantage that it is convenient to discharge flue gas purification.

Description

Technical Field

[0001] This utility model relates to the technical field of circulating spray wet dust collectors, and in particular to a wet dust collector with self-circulating spray. Background Technology

[0002] In industrial production processes such as power generation, metallurgy, chemical industry, papermaking, and waste incineration, large amounts of industrial flue gas rich in dust and harmful gases are inevitably generated. Direct emission of these pollutants will seriously harm the atmospheric environment and human health. Wet scrubbers, commonly known as "demisters," are devices that bring dust-laden gas into close contact with a liquid, utilizing the inertial collision of water droplets and particles, the thorough mixing of water and dust, and other mechanisms to capture particles, enlarge them, or retain them in a fixed container, achieving the effect of separating water and dust. Wet scrubbers are frequently used for air purification and dust removal.

[0003] Existing technologies, such as the utility model patent with publication number CN218653625U, disclose a wet dust collector with a water recycling function. This patent includes a housing, with a distribution pipe extending through the top left side of the housing. The distribution pipe has a distribution hole at its top. The inner cavity of the housing is fixedly connected to a first partition and a second partition from top to bottom. This utility model has the advantages of automatic cleaning of the air supply duct and water recycling, solving some shortcomings of existing wet dust collectors in practical use. A significant shortcoming is the lack of water recycling, which prevents the filtration and recycling of sprayed water, resulting in a large waste of water resources. Additionally, the lack of duct cleaning function leads to the accumulation of dust and impurities on the inner wall of the air supply duct over long-term use, causing blockages, affecting air supply efficiency, and reducing the applicability of the wet dust collector.

[0004] When purifying and removing dust from exhaust gas, the water level in the circulating water tank will fluctuate continuously due to evaporation, sewage discharge, and spraying losses. This can lead to unstable operation of the spraying system, reduced dust removal efficiency, and problems such as pump idling and damage or excessive water consumption. Utility Model Content

[0005] The purpose of this invention is to solve the problem that in the existing technology, when purifying and removing dust from exhaust gas, the water level in the circulating water tank will fluctuate continuously due to evaporation, sewage discharge and spray loss, which will lead to unstable operation of the spray system, reduced dust removal efficiency, and easy damage to the water pump due to dry running or excessive consumption of water resources.

[0006] To solve the above technical problems, this utility model provides a wet scrubber with self-circulating spraying, comprising: a scrubbing tower, a sewage tank, and a circulating water tank. The scrubbing tower has a smoke exhaust port at its upper end, an air inlet pipe on its upper arc surface, and an inspection port on its arc surface. An air inlet pipe is fixedly connected to one side of the bottom of the scrubbing tower. The bottom of the scrubbing tower is fixedly connected to the inner wall of the sewage tank, and one side of the sewage tank is fixedly connected to one side of the circulating water tank. Both the circulating water tank and the sewage tank have sewage outlets on one side of their bottom ends. A circulating water pump is installed at the upper end of the circulating water tank, and a water supply pipe is installed at the output end of the circulating water pump. A second spray pipe is installed on the water supply pipe corresponding to the position of the smoke inlet pipe. A first spray pipe and a third spray pipe are respectively installed at the two ends of the water supply pipe inside the scrubbing tower. A water replenishment pipe is fixedly connected to one side wall of the circulating water tank, and an opening and closing device is installed on the inner wall of the circulating water tank corresponding to the position of the water replenishment pipe. The opening and closing device includes a support frame. The support frame is fixedly connected to the inner wall of the circulating water tank. A wedge is fixedly connected to the bottom end of the inner wall of the support frame corresponding to the adjusting ball. The surface of the wedge abuts against the arc surface of the adjusting ball. Several through holes are opened on the lower surface of the support frame. The position of the support frame corresponds to the position of the water supply pipe. A rotating rod is rotatably connected to the inner wall of the support frame. A connecting plate is fixedly connected to the arc surface of the rotating rod. An adjusting ball (made of wood) is fixedly connected to the bottom end of the connecting plate. An active bevel tooth is fixedly connected to one end of the rotating rod. A support frame is fixedly connected to the side wall of the circulating water tank corresponding to the position of the rotating rod. A driven bevel tooth is rotatably connected to the inner wall of the support frame. The tooth surface of the driven bevel tooth meshes with the tooth surface of the active bevel tooth. A moving rod is threaded through the inner wall of the driven bevel tooth. A closing plate is rotatably connected to the upper end of the moving rod. A positioning frame is fixedly connected to the inner wall of the circulating water tank corresponding to the position of the water supply pipe. A sealing ring is fixedly connected to the inner wall of the positioning frame, and the position of the sealing ring corresponds to the position of the water supply pipe.

[0007] The aforementioned components achieve the following effect: automatic water replenishment control of the circulating water tank is realized through the opening and closing device. When the water level in the circulating water tank drops, the wooden regulating ball moves down with the water level, pushing the connecting plate and rotating rod to rotate under the action of the inclined block. This drives the active and driven bevel teeth to mesh and transmit power, causing the moving rod to move upward, thereby lifting the closing plate and opening the water replenishment pipe for water replenishment. When the water level rises, the regulating ball floats up, the rotating rod rotates in the opposite direction, and the moving rod presses down on the closing plate, making it tightly fit with the sealing ring in the positioning frame, thus closing the water replenishment pipe. This automatic adjustment mechanism ensures the stability of the water level in the circulating water system, maintains the continuous operation of the spray system, improves dust removal efficiency, and reduces manual intervention. At the same time, the multi-stage spray pipes in the scrubbing tower thoroughly scrub the flue gas, and the dust is carried into the sewage tank, achieving efficient dust removal.

[0008] Preferably, side plates are fixedly connected to the inner wall surface of the circulating water tank at positions corresponding to both sides of the closed plate. The side plates have an "L" shaped cross-section, and one side of the side plate is slidably connected to the side wall surface of the closed plate.

[0009] The effects achieved by the above components are as follows: the "L"-shaped design of the side plate provides guidance and limit for the movement of the closing plate, preventing the closing plate from shifting or getting stuck during the opening and closing process, ensuring that the sealing surface of the closing plate is aligned with the positioning frame, improving the sealing performance when closed, reducing the risk of leakage from the water supply pipe, thereby enhancing the reliability and durability of the opening and closing device.

[0010] Preferably, a baffle is fixedly connected to the upper end of the inner wall of the support frame, the end of the baffle near the closing plate has an inclined cross section, and a protective pad, which is a rubber pad, is fixedly connected to the lower surface of the baffle.

[0011] The effects achieved by the above components are as follows: the inclined structure of the baffle can effectively prevent the adjusting ball from accidentally detaching from the support frame, thus avoiding failure of the opening and closing device; the protective pad is made of rubber material, which plays a role in buffering and reducing friction, reducing noise and wear when the adjusting ball collides with the baffle, extending the service life of the adjusting ball and the support frame, and ensuring the stability of automatic water replenishment control.

[0012] Preferably, a magnetic sheet is fixedly connected to the upper arc surface of the closed plate, the positioning frame is a stainless steel frame, and the cross-sectional dimensions of the magnetic sheet are adapted to the cross-sectional dimensions of the inner wall of the positioning frame.

[0013] The effects achieved by the above components are as follows: the magnetic attraction between the magnetic sheet and the stainless steel positioning frame provides additional closing force, making the closing plate fit more tightly with the sealing ring when closed, enhancing the sealing effect of the water supply pipe, preventing water droplet leakage, ensuring accurate water level control in the circulating water tank, and reducing energy loss and maintenance requirements.

[0014] Preferably, a filter device is provided on the upper surface of the washing tower at the position corresponding to the exhaust port. The filter device includes a mounting frame with a cylindrical cross-section. The inner wall of the mounting frame is slidably connected to the upper inner wall of the washing tower. A filter cylinder, which is an activated carbon cotton cylinder, is rotatably connected to the inner wall of the mounting frame. Connecting blocks are fixedly connected to both sides of the upper surface of the mounting frame. The inner wall of the connecting block has a "U"-shaped cross-section. A connecting column is fixedly connected to the upper surface of the washing tower at the position of the connecting block. The arc surface of the connecting column is inserted into the inner wall of the connecting block. A connecting shaft is threadedly connected to the arc surface of the connecting column. The lower surface of the connecting shaft abuts against the surface of the connecting block.

[0015] The effects achieved by the above components are as follows: the filtration device performs secondary purification of the flue gas after washing through the activated carbon cotton filter cartridge, adsorbing residual odors, harmful gases or fine particles, and improving the cleanliness of the emitted flue gas; the sliding connection between the mounting frame and the scrubbing tower and the plug-in design of the connecting block and the connecting column facilitate the quick installation and disassembly of the filter cartridge, simplify the cleaning or replacement process, and improve maintenance efficiency.

[0016] Preferably, a guide frame is fixedly connected to the lower surface of the mounting frame, and the cross-section of the guide frame is flared.

[0017] The effects achieved by the above components are as follows: the flared structure of the guide frame can guide the flue gas to diffuse evenly and enter the filter cartridge, avoid the flue gas velocity being too high in some areas, which would lead to uneven filtration, improve the utilization rate and purification effect of the filter cartridge, and at the same time reduce airflow resistance and reduce energy consumption.

[0018] Preferably, an insert block is fixedly connected to the inner wall of the mounting frame. The insert block has a pointed conical cross-section and is located inside the filter cylinder.

[0019] The effects achieved by the above components are as follows: the conical design of the insert supports the inside of the filter cartridge, preventing it from deforming or collapsing under the impact of flue gas, and maintaining the structural stability of the filter cartridge; at the same time, the conical shape can disperse the flue gas flow, increase the contact area between the flue gas and the activated carbon cotton, and improve the adsorption efficiency and filtration effect.

[0020] Compared with related technologies, the wet dust collector with self-circulating spray provided by this utility model has the following beneficial effects:

[0021] This invention provides a wet scrubber with a self-circulating spray system, which achieves automatic and precise adjustment of the circulating water level through the operation of the opening and closing device. The device utilizes the buoyancy of a wooden adjusting ball as the water level changes, and drives the opening and closing of the closing plate through a purely mechanical bevel gear and lever transmission, achieving automatic water replenishment without external power. This not only ensures a continuous and stable water supply for the spray system, preventing pump idling or reduced dust removal efficiency due to low water levels, but also effectively prevents water overflow and waste, significantly reducing equipment maintenance needs and operating costs.

[0022] By operating the filtration device, deep purification of the emitted flue gas and convenient maintenance of the filter element are achieved. The activated carbon cotton filter cartridge installed at the exhaust port effectively adsorbs residual odors, moisture, and trace harmful substances in the flue gas, improving the cleanliness of the final emitted gas. Simultaneously, the plug-in fixing method of the connecting block and connecting column, combined with the rotatable filter cartridge design, allows the entire filter unit to be quickly removed from the scrubbing tower for cleaning or replacement. This modular design greatly simplifies the maintenance process, shortens equipment downtime, and ensures the long-term stable purification performance of the dust collector. Attached Figure Description

[0023] Figure 1 A schematic diagram of a wet dust collector with self-circulating spray provided by this utility model;

[0024] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the three-dimensional structure.

[0025] Figure 3 for Figure 2 The diagram shows the structure of the opening and closing device.

[0026] Figure 4 for Figure 3 The enlarged structural diagram at point A is shown below;

[0027] Figure 5 for Figure 1 The diagram shows the structure of the filtration device.

[0028] Figure 6 for Figure 5 A schematic diagram of a partial cross-sectional structure of the filter device shown.

[0029] The diagram labels are as follows: 1. Scrubber; 2. Wastewater tank; 3. Circulating water tank; 4. Opening and closing device; 401. Bearing frame; 402. Adjusting ball; 403. Through hole; 404. Inclined block; 405. Positioning frame; 406. Baffle; 407. Protective pad; 408. Sealing ring; 409. Magnetic sheet; 410. Side plate; 411. Closing plate; 412. Moving rod; 413. Rotating rod; 414. Connecting plate; 415. Support frame; 416. 417 Driven bevel gear; 5 Filter device; 51 Mounting frame; 52 Filter cylinder; 53 Inlay block; 54 Connecting block; 55 Connecting column; 56 Connecting shaft; 57 Guide frame; 6 Smoke inlet pipe; 7 Water supply pipe; 8 Sewage outlet; 9 Inspection port; 10 Circulating water pump; 11 Water supply pipe; 12 First spray pipe; 13 Second spray pipe; 14 Air inlet pipe; 15 Third spray pipe; 16 Smoke outlet. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0031] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0032] Please see Figures 1 to 6This utility model provides a wet dust collector with self-circulating spray, comprising: a scrubbing tower 1, a sewage tank 2, and a circulating water tank 3. The upper end of the scrubbing tower 1 is provided with a smoke exhaust port 16, and an air inlet duct 14 is provided on the arc-shaped surface of the upper end of the scrubbing tower 1. An inspection port 9 is installed on the arc-shaped surface of the scrubbing tower 1. A smoke inlet duct 6 is fixedly connected to one side of the bottom end of the scrubbing tower 1. The bottom end of the scrubbing tower 1 is fixedly connected to the inner wall of the sewage tank 2, and one side of the sewage tank 2 is fixedly connected to one side of the circulating water tank 3. Both the bottom ends of the circulating water tank 3 and the sewage tank 2 are provided with... A sewage outlet 8 is provided. A circulating water pump 10 is installed at the upper end of the circulating water tank 3. A water supply pipe 11 is installed at the output end of the circulating water pump 10. A second spray pipe 13 is provided at the position of the water supply pipe 11 corresponding to the position of the smoke inlet pipe 6. A first spray pipe 12 and a third spray pipe 15 are respectively provided at the two ends of the water supply pipe 11 corresponding to the positions inside the scrubbing tower 1. A water supply pipe 7 is fixedly connected to one side wall of the circulating water tank 3. An opening and closing device 4 is provided on the inner wall of the circulating water tank 3 corresponding to the position of the water supply pipe 7. A filter device 5 is provided on the upper surface of the scrubbing tower 1 corresponding to the position of the smoke outlet 16.

[0033] In the embodiments of this utility model, please refer to Figure 2 , Figure 3 and Figure 4The opening and closing device 4 includes a support frame 401. One side of the support frame 401 is fixedly connected to the inner wall surface of the circulating water tank 3. An inclined block 404 is fixedly connected to the bottom end of the inner wall of the support frame 401 corresponding to the adjusting ball 402. The surface of the inclined block 404 abuts against the arc surface of the adjusting ball 402. Several through holes 403 are opened on the lower surface of the support frame 401. The position of the support frame 401 corresponds to the position of the water supply pipe 7. A rotating rod 413 is rotatably connected to the inner wall of the support frame 401. A connecting plate 414 is fixedly connected to the arc surface of the rotating rod 413. An adjusting ball 402, which is made of wood, is fixedly connected to the bottom end of the connecting plate 414. An active bevel gear 417 is fixedly connected to one end of the rotating rod 413. A support frame 415 is fixedly connected to the side wall of the circulating water pool 3 at the position corresponding to the rotating rod 413. A driven bevel gear 416 is rotatably connected to the inner wall of the support frame 415. The tooth surface of the driven bevel gear 416 meshes with the tooth surface of the active bevel gear 417. A movable rod 412 is threaded through the inner wall of the circulating water tank 3. A closing plate 411 is rotatably connected to the upper end of the movable rod 412. A positioning frame 405 is fixedly connected to the inner wall of the circulating water tank 3 at the position corresponding to the water supply pipe 7. A sealing ring 408 is fixedly connected to the inner wall of the positioning frame 405. The position of the sealing ring 408 corresponds to the position of the water supply pipe 7. Side plates 410 are fixedly connected to both sides of the inner wall surface of the circulating water tank 3 at the positions corresponding to the closing plate 411. The cross-section of the side plates 410 is "L" shaped. One side of the frame is slidably connected to the side wall surface of the closing plate 411. A baffle 406 is fixedly connected to the upper end of the inner wall of the bearing frame 401. The cross section of the baffle 406 near the closing plate 411 is inclined. A protective pad 407 is fixedly connected to the lower surface of the baffle 406. The protective pad 407 is a rubber pad. A magnetic sheet 409 is fixedly connected to the upper arc surface of the closing plate 411. The positioning frame 405 is a stainless steel frame. The cross-sectional dimensions of the magnetic sheet 409 are adapted to the cross-sectional dimensions of the inner wall of the positioning frame 405.

[0034] In the embodiments of this utility model, please refer to Figure 5 and Figure 6 The filter device 5 includes a mounting frame 51 with a cylindrical cross-section. The inner wall of the mounting frame 51 is slidably connected to the upper inner wall of the washing tower 1. A filter cylinder 52, which is an activated carbon cotton cylinder, is rotatably connected to the inner wall of the mounting frame 51. Connecting blocks 54 are fixedly connected to both sides of the upper surface of the mounting frame 51. The inner wall of the connecting block 54 has a "U" shaped cross-section. A connecting column 55 is fixedly connected to the upper surface of the washing tower 1 at the position of the connecting block 54. The arc surface of the connecting column 55 is inserted into the inner wall of the connecting block 54. A connecting shaft 56 is threadedly connected to the arc surface of the connecting column 55. The lower surface of the connecting shaft 56 abuts against the surface of the connecting block 54. A guide frame 57 is fixedly connected to the lower surface of the mounting frame 51. The guide frame 57 has an flared cross-section. An insert block 53 is fixedly connected to the inner wall of the mounting frame 51. The insert block 53 has a pointed conical cross-section and is located inside the filter cylinder 52.

[0035] The working principle of the wet scrubber with self-circulating spray provided by this utility model is as follows: The dust-laden flue gas to be treated first enters the middle of the scrubbing tower 1 through the inlet pipe 14 and flows downward. Inside the tower, the flue gas is strongly washed by the scrubbing liquid sprayed from different positions and angles by the first spray pipe 12, the second spray pipe 13, and the third spray pipe 15. The droplets collide, intercept, and agglomerate with the dust particles in the flue gas, causing the dust to be captured by the water. The purified clean gas rises and, after deep adsorption and odor removal by the activated carbon cotton filter cartridge 52 in the filter device 5, is discharged from the exhaust port 16 at the top, meeting the emission standards. The scrubbing liquid that has captured the dust, under the action of gravity, enters the sewage tank 2 along with part of the flue gas through the inlet pipe 6 at the bottom of the scrubbing tower 1. In the sewage tank 2, large dust particles settle rapidly, while sewage containing fine particles overflows into the adjacent circulating water tank 3. Both pools have drain outlets 8 at the bottom for periodically removing accumulated sludge and keeping the system clean. Relatively clean water is collected in the circulating water pool 3. The circulating water pump 10 continuously pumps water from the pools back to the spray pipes of each layer through the water supply pipe 11, realizing the recycling of washing liquid and greatly saving water resources. At the same time, the opening and closing device 4 automatically maintains the water level balance of the circulating water pool 3: when the water level drops, the wooden adjusting ball 402 sinks due to reduced buoyancy, driving the active bevel gear 417 to rotate through the rotating rod 413 and connecting plate 414, driving the driven bevel gear 416 that meshes with it, causing the moving rod 412 to move upward, lifting the closing plate 411, thereby opening the water supply pipe 7 for water replenishment; when the water level rises back to the set height, the adjusting ball 402 floats up, driving the transmission mechanism to move in the opposite direction, so that the closing plate 411 is tightly pressed against the sealing ring 408 of the positioning frame 405, closing the water supply, thereby achieving fully automatic and precise water level control without external power consumption.

[0036] The circuits and controls involved in this utility model are all existing technologies and will not be described in detail here.

[0037] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A wet dust collector with self-circulating spraying, characterized in that, include: The washing tower (1), the sewage tank (2), and the circulating water tank (3) are provided. The upper end of the washing tower (1) is provided with a smoke exhaust port (16). The upper arc surface of the washing tower (1) is provided with an air inlet pipe (14). The arc surface of the washing tower (1) is provided with an inspection port (9). The bottom end of the washing tower (1) is fixedly connected to one side of the smoke inlet pipe (6). The bottom end of the washing tower (1) is fixedly connected to the inner wall of the sewage tank (2). One side of the sewage tank (2) is fixedly connected to one side of the circulating water tank (3). The bottom end of the circulating water tank (3) and the sewage tank (2) are both provided with a sewage outlet (8). The upper end of the circulating water tank (3) is equipped with a circulating water pump (10). The output end of 10) is equipped with a water supply pipe (11). A second spray pipe (13) is set at the position of the water supply pipe (11) corresponding to the position of the smoke inlet pipe (6). A first spray pipe (12) and a third spray pipe (15) are respectively set at the two ends of the water supply pipe (1) corresponding to the positions inside the scrubbing tower (1). A water supply pipe (7) is fixedly connected to one side wall of the circulating water tank (3). An opening and closing device (4) is set at the position of the water supply pipe (7) corresponding to the position of the inner wall of the circulating water tank (3). The opening and closing device (4) includes a support frame (401). One side of the support frame (401) is fixedly connected to the inner wall surface of the circulating water tank (3). The inner wall of the support frame (401) corresponds to the position of the regulating ball (402). A wedge (404) is fixedly connected to one bottom end. The surface of the wedge (404) abuts against the arc surface of the adjusting ball (402). Several through holes (403) are opened on the lower surface of the support frame (401). The position of the support frame (401) corresponds to the position of the water supply pipe (7). A rotating rod (413) is rotatably connected to the inner wall of the support frame (401). A connecting plate (414) is fixedly connected to the arc surface of the rotating rod (413). An adjusting ball (402) is fixedly connected to the bottom end of the connecting plate (414). The adjusting ball (402) is a wooden ball. An active bevel tooth (417) is fixedly connected to one end of the rotating rod (413). The circulating water pool ( 3) A support frame (415) is fixedly connected to the side wall corresponding to the position of the rotating rod (413). A driven bevel tooth (416) is rotatably connected to the inner wall of the support frame (415). The tooth surface of the driven bevel tooth (416) meshes with the tooth surface of the driving bevel tooth (417). A moving rod (412) is threaded through the inner wall of the driven bevel tooth (416). A closing plate (411) is rotatably connected to the upper end of the moving rod (412). A positioning frame (405) is fixedly connected to the inner wall of the circulating water tank (3) corresponding to the position of the water supply pipe (7). A sealing ring (408) is fixedly connected to the inner wall of the positioning frame (405). The position of the sealing ring (408) corresponds to the position of the water supply pipe (7).

2. A wet dust collector with self-circulating spray according to claim 1, characterized in that, The inner wall surface of the circulating water tank (3) is fixedly connected with side plates (410) at positions corresponding to both sides of the closed plate (411). The cross-section of the side plate (410) is "L" shaped, and one side of the side plate (410) is slidably connected to the side wall surface of the closed plate (411).

3. A wet dust collector with self-circulating spray according to claim 1, characterized in that, A baffle (406) is fixedly connected to the upper end of the inner wall of the bearing frame (401). The baffle (406) has an inclined cross section at the end near the closing plate (411). A protective pad (407) is fixedly connected to the lower surface of the baffle (406). The protective pad (407) is a rubber pad.

4. A wet dust collector with self-circulating spray according to claim 1, characterized in that, A magnetic sheet (409) is fixedly connected to the upper arc surface of the closed plate (411). The positioning frame (405) is a stainless steel frame. The cross-sectional dimensions of the magnetic sheet (409) are adapted to the cross-sectional dimensions of the inner wall of the positioning frame (405).

5. A wet dust collector with self-circulating spray according to claim 1, characterized in that, A filter device (5) is provided on the upper surface of the washing tower (1) at the position corresponding to the exhaust port (16). The filter device (5) includes a mounting frame (51). The mounting frame (51) has a cylindrical cross-section. The inner wall of the mounting frame (51) is slidably connected to the upper inner wall of the washing tower (1). A filter cylinder (52) is rotatably connected to the inner wall of the mounting frame (51). The filter cylinder (52) is an activated carbon cotton cylinder. Connecting blocks (54) are fixedly connected to both sides of the upper surface of the mounting frame (51). The inner wall cross-section of the connecting block (54) is "U". A connecting column (55) is fixedly connected to the upper surface of the washing tower (1) at the position of the connecting block (54). The arc surface of the connecting column (55) is inserted into the inner wall of the connecting block (54). The arc surface of the connecting column (55) is threadedly connected to a connecting shaft (56). The lower surface of the connecting shaft (56) abuts against the surface of the connecting block (54).

6. A wet dust collector with self-circulating spray according to claim 5, characterized in that, A guide frame (57) is fixedly connected to the lower surface of the mounting frame (51), and the cross-section of the guide frame (57) is flared.

7. A wet dust collector with self-circulating spray according to claim 5, characterized in that, An inlay block (53) is fixedly connected to the inner wall of the mounting frame (51). The inlay block (53) has a pointed cone-shaped cross section and is located inside the filter cylinder (52).

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