Multilayer circulating wet dust removal integrated device

Abstract

The utility model discloses a multilayer circulating wet dust removal integrated equipment relates to industrial dust gas purification field. The utility model discloses a multilayer circulating wet dust removal integrated equipment for the traditional wet dust removal water quality mixed use, nozzle easy scale blockage, fine dust removal is not stable and the problem of high water consumption, propose. The device is by the main part and washing chamber, inlet, nozzle, circulating pump, back liquid tank, liquid ring groove of throwing liquid constitute the directional back liquid closed loop, with the air -solid circulation channel of drop hopper, fan, circulating air duct composition: material is after the spray wetting and enters the ring groove and returns to back liquid tank through centrifugal sieve throwing liquid, and airflow is sent back cavity top again and washes from drop hopper, and repeatedly circulates. The scheme realizes liquid solid path separation and stratified management, reduces the water supplement and the pollution frequency, restrains the liquid carrying and scale, improves fine particle trapping efficiency and stabilizes the pressure drop, and long -term continuous operation is convenient.

Description

Technical Field

[0001] This utility model relates to the field of industrial dust-laden gas purification, specifically a multi-layer circulating wet dust removal integrated equipment. Background Technology

[0002] Existing wet dust collection systems are widely used in dust-generating environments such as mining, building materials, metallurgy, and chemical industries. Typical forms include spray towers, packed scrubbers, Venturi scrubbers, and combined towers with demisters. Their basic principle is to utilize the contact between the spray liquid and the dust-laden gas, wetting the dust and separating it with the liquid. The dust is then discharged after the entrained liquid droplets are removed by the demister. However, existing wet dust collection equipment (publication number: CN110614002A) has the following drawbacks and requires further improvement.

[0003] Traditional single-cavity or single-loop wet scrubbing equipment commonly suffers from the problem of mixed water quality: the spray return liquid is mixed indiscriminately with the coarse and fine washes in the tower, the solid content of the return liquid rises rapidly, leading to nozzle scaling and clogging, easy fouling of the demister, and the need for frequent water replenishment and drainage, resulting in increased energy and water consumption; at the same time, the flow field in the tower is prone to short circuits and dead zones, insufficient gas-liquid contact, and the fine particle removal rate fluctuates with the operating conditions, resulting in a short maintenance window.

[0004] Traditional structures rely heavily on single-pass gravity settling and spray collection, lacking internal channels for recycling materials or gas-solid mixtures back to the upper part for rewashing. They also lack structures for directional collection and stable return of the ejected cleaning liquid, making it difficult to form a layered management system of gas-solid circulation and liquid return circulation. When the dust particle size range is large or the adhesion is strong, the efficiency of solid-liquid separation and liquid return clarification is limited, and sludge easily accumulates at the bottom and is carried away again at the top, resulting in decreased dust removal efficiency, increased operating pressure drop, and increased maintenance frequency. Utility Model Content

[0005] The main purpose of this utility model is to provide a multi-layer circulating wet dust removal integrated equipment, which can effectively solve the problems in the background technology.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a multi-layer circulating wet dust removal integrated device, wherein a washing chamber is provided on the upper inner side of the main body, and a material inlet is provided on the side wall of the main body and communicates with the washing chamber; A motor is fixedly installed on the outside of the main body. The motor is driven by a drive shaft assembly that passes through the side wall of the main body. The inner end of the drive shaft assembly is fixedly connected to a centrifugal sieve located below the washing chamber. The centrifugal sieve is provided with a liquid-throwing ring hole on its outer periphery, and the liquid-throwing ring hole is connected to the return tank located at the lower part of the main body; The centrifugal screen is provided with a hopper below it. The hopper is connected to the air inlet side of the fan arranged on the outside of the main body. The air outlet side of the fan is connected to the circulating air duct arranged vertically along the outside of the main body. The upper end of the circulating air duct is connected to the upper space of the washing chamber, thereby forming a gas-solid circulation channel from the hopper through the fan and the circulating air duct back to the washing chamber. The return tank is connected to the suction port of the circulation pump via a suction pipe. The discharge port of the circulation pump is connected to a nozzle arranged in the washing chamber. The nozzle sprays towards the washing chamber, and the sprayed liquid is thrown into the throwing ring hole through the centrifugal sieve and flows back to the return tank.

[0007] Preferably, the drive shaft assembly includes a through-wall bushing welded and fixed to the side wall of the main body, a bearing seat connected to the inner end of the bushing by bolts, and a mechanical seal disposed between the bearing seat and the centrifugal sieve. The drive shaft assembly is connected to the motor by a coupling. The diameter of the drive shaft is 20-40mm, and the inner hole of the bushing and the drive shaft are fitted with H7 / h6.

[0008] Preferably, the centrifugal screen is a cylindrical screen structure with straight screen holes evenly distributed along the circumference of the cylinder wall. The screen hole diameter is 1.0 to 3.0 mm and the hole spacing is 6 to 12 mm. The upper end of the centrifugal screen is connected to the end of the drive shaft assembly through a flange, and the lower end is provided with a downward guide cone and coaxially arranged with the discharge hopper.

[0009] Preferably, the liquid-throwing ring hole is an annular liquid-collecting trough set on the outer periphery of the centrifugal sieve. The liquid-collecting trough is fixed to the inner wall of the main body by welding. The bottom of the trough has a slope of 2 to 4 degrees along the liquid return direction and multiple rows of overflow holes are opened. The diameter of a single overflow hole is 8 to 12 mm and the hole spacing is 15 to 25 mm.

[0010] Preferably, the return tank is located at the bottom of the main body and is integrally welded to the main body base plate to form a tank. The bottom surface of the return tank is provided with a slope of 2 to 5 degrees along the sludge discharge direction and a DN25 to DN40 sewage outlet is opened at the lowest point. The sewage outlet is connected to the external sewage pipe by an internal threaded short connector. The top surface of the return tank is provided with a DN20 overflow short pipe and is coaxially arranged with the return interface of the liquid return short pipe of the liquid throwing ring hole.

[0011] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes a centrifugal sieve, a liquid-throwing ring trough, a return liquid trough, a suction pipe, a circulating pump, nozzles, and a washing chamber to form a directional return liquid closed loop. The mixture flow, after being sprayed and wetted, first passes through the centrifugal sieve to throw the liquid phase into the ring trough and directly guide it back to the return liquid trough, while the solid phase falls into the discharge hopper through the sieve holes, achieving physical separation of the liquid and solid paths and preventing solids carried in the coarse washing zone from flowing back to the nozzle side. This significantly reduces the rate of increase in the solid content of the returned liquid, keeps the nozzle spray particle size and cone angle stable for a long time, reduces the risk of scaling / clogging, reduces the frequency of sewage discharge and water replenishment, and simultaneously reduces water and energy consumption. At the same time, the return liquid trough centrally collects the returned liquid and settles impurities, ensuring that the circulating pump and nozzles are in a relatively clean operating condition for a long time.

[0012] This invention forms a dual circulation channel inside and outside the main body: First, the gas-solid circulation return path composed of the fan, circulating air duct, washing chamber, centrifugal screen, and discharge hopper allows the initially separated particles to be lifted back into the spray zone for repeated wetting and separation, significantly extending the effective contact residence and inhibiting liquid carry-out; Second, the above-mentioned directional liquid return closed loop maintains a stable spray liquid supply and continuously removes the fine mud generated by the sticky particles. The combination of the two achieves stable collection and stratified management of wide-particle-size, sticky dust, reducing the diffusion of accumulated mud in the bottom area and the liquid carry-back in the upper space, thereby reducing the fluctuation of operating pressure drop and extending the continuous operation and maintenance cycle. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] In the diagram: 1. Main body; 2. Washing chamber; 3. Feed inlet; 4. Motor; 5. Drive shaft assembly; 6. Centrifugal sieve; 7. Liquid ejection ring hole; 8. Feed hopper; 9. Circulating air duct; 10. Fan; 11. Return liquid tank; 12. Circulating pump; 13. Liquid extraction pipe; 14. Nozzle. Detailed Implementation

[0015] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0016] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example

[0018] Please see Figure 1 This utility model provides a technical solution: A multi-layer circulating wet dust removal integrated device, wherein a washing chamber 2 is provided on the upper inner side of the main body 1, and a feed inlet 3 is provided on the side wall of the main body 1 and communicates with the washing chamber 2; A motor 4 is fixedly installed on the outside of the main body 1. The motor 4 is driven by a transmission shaft assembly 5 that passes through the side wall of the main body 1. The inner end of the transmission shaft assembly 5 is fixedly connected to a centrifugal sieve 6 located below the washing chamber 2. The centrifugal sieve 6 is provided with a liquid-throwing ring hole 7 on its outer periphery, and the liquid-throwing ring hole 7 is connected to the liquid return tank 11 located at the lower part of the main body 1; Below the centrifugal sieve 6 is a discharge hopper 8, which is connected to the air inlet side of the fan 10 arranged on the outside of the main body 1. The air outlet side of the fan 10 is connected to the circulation duct 9 arranged vertically along the outside of the main body 1. The upper end of the circulation duct 9 is connected to the upper space of the washing chamber 2, thereby forming a gas-solid circulation channel from the discharge hopper 8 through the fan 10 and the circulation duct 9 back to the washing chamber 2. The return tank 11 is connected to the suction port of the circulation pump 12 via the suction pipe 13. The discharge port of the circulation pump 12 is connected to the nozzle 14 arranged in the washing chamber 2. The nozzle 14 sprays towards the washing chamber 2, and the sprayed liquid is thrown into the throwing ring hole 7 through the centrifugal sieve 6 and flows back to the return tank 11. This embodiment provides a multi-layer circulating wet dust removal integrated device. The device mainly consists of the following components: a main body, a washing chamber located inside the upper part of the main body, a feed inlet on the side wall of the main body, a motor fixedly installed on the outside of the main body, a drive shaft assembly connected to the motor and passing through the side wall of the main body, a centrifugal screen connected to the inner end of the drive shaft assembly, liquid-throwing ring holes surrounding the outer periphery of the centrifugal screen, a discharge hopper located below the centrifugal screen, a circulating air duct arranged on the outside of the main body, a fan connected to the circulating air duct, a return liquid tank located at the bottom of the main body, a suction pipe connected to the return liquid tank and a circulating pump thereon, and nozzles installed in the washing chamber. All components are connected through pipes and interfaces to jointly achieve the multi-layer circulating wet dust removal function.

[0019] The main body is the outer shell structure of this equipment, which can be a cylindrical tank or similar container, with the upper internal space forming a washing chamber. An inlet is opened on the side wall of the main body for the entry of dust-laden gas or powder. The inlet can be positioned at an appropriate height on the side of the washing chamber as needed, so that the incoming dust-laden airflow has sufficient retention space within the chamber to fully contact the liquid. A motor is fixedly mounted on the external side wall of the main body, and the motor is connected to a drive shaft assembly via a coupling to transmit power to the drive shaft assembly. The drive shaft assembly passes through the side wall of the main body, with its inner end extending into the lower space of the washing chamber and fixedly connected to the central shaft of the centrifugal sieve. To ensure reliable sealing and stable operation at the drive shaft penetration point, the drive shaft assembly includes: a through-wall bushing welded and fixed to the main body wall, a bearing seat bolted to the inner end of the bushing, and a mechanical seal structure installed between the bearing seat and the centrifugal sieve. Preferably, the diameter of the drive shaft is approximately 30mm, and the inner hole of the bushing and the drive shaft are fitted with an H7 / h6 tolerance to ensure both good coaxiality and appropriate clearance lubrication. With the above structure, when the motor drives the transmission shaft to rotate, the centrifugal sieve can rotate smoothly and at high speed with the shaft, while avoiding leakage of liquid inside the washing chamber along the shaft.

[0020] The centrifugal screen is a cylindrical screen structure located below the washing chamber and rotated by a drive shaft. Numerous through-holes are evenly arranged along the circumference of the screen cylinder wall. In this embodiment, the screen hole diameter is 2.0 mm, and the hole spacing is approximately 10 mm. This screen hole size design allows liquids and fine particles to pass smoothly through the screen holes, while larger particles or agglomerated dust clumps are intercepted and thrown towards the cylinder wall by centrifugal force. The upper end of the centrifugal screen is connected to the end of the drive shaft assembly via a flange, allowing the screen cylinder to rotate synchronously with the drive shaft; the lower end forms a downward-contracting guide cone structure. This short cone extends downward in a funnel shape and is coaxially arranged with the hopper below it, guiding solid particles and liquid droplets falling from the screen cylinder to the center of the hopper, preventing material from scattering on the outside of the screen cylinder and making collection difficult.

[0021] A ring-shaped liquid collection groove, or liquid-throwing ring hole, is fixed along the inner wall of the main body around the outer periphery of the centrifugal screen. This ring groove is welded to the inner wall of the main body, with its opening facing the centrifugal screen, and is used to collect the liquid thrown out by the centrifugal screen during high-speed rotation. The ring-shaped liquid collection groove is actually a liquid collection ring groove surrounding the screen cylinder. Its bottom is inclined at approximately 3° along the liquid return direction, allowing the collected liquid to flow slowly along the bottom of the groove towards the designated return outlet under gravity. Near the lowest point, multiple rows of overflow holes are formed at the bottom of the ring groove to guide the liquid out of the ring groove. In this embodiment, the overflow hole diameter is 10mm, and the hole spacing is approximately 20mm. These overflow holes quickly discharge the liquid accumulated in the groove, flowing into a short dropper pipe connected to it, and finally returning to the return groove at the bottom. Through the above structural design, when the centrifugal screen rotates and throws out droplets, these droplets are intercepted and collected by the ring groove and discharged through the overflow holes, achieving efficient separation of liquid and gas-solid mixtures and preventing a large amount of liquid from entering the subsequent fan duct with the airflow.

[0022] A funnel-shaped hopper is positioned directly below the centrifugal screen. The upper opening of the hopper is aligned with the guide cone at the lower end of the centrifugal screen. Its function is to collect dust particles and a small amount of airflow that leaks through the screen openings or is ejected by the guide cone, and guide them to the fan inlet. The material collected by the hopper mainly consists of fine dust particles not captured by the liquid and a small amount of liquid droplets carried by the airflow. The lower part of the hopper is connected to the fan inlet via a pipe or a direct structure. The fan is preferably a moisture-resistant centrifugal fan, installed on the outside of the main body near the hopper outlet, and its outlet is sealed to the fan inlet via a pipe. The fan outlet is connected to the upper space of the washing chamber via a vertically arranged circulating air duct. The circulating air duct can be arranged as a straight pipe along the outer wall of the main body or spiraling upwards around the main body. In this embodiment, it is a straight pipe running vertically upwards along the outer side of the main body, with its upper opening located in the top area of ​​the washing chamber and facing inwards. Thus, the fan, circulating air duct, washing chamber, and hopper together form a closed gas-solid circulation channel: the dust-laden gas from the hopper is drawn out by the fan, pressurized by the fan, and sent back to the top of the washing chamber along the circulating air duct, where it re-enters the washing chamber for circulation and purification.

[0023] A return liquid tank is installed at the bottom of the main body to collect the recycled washing liquid. The return liquid tank can be a tank structure welded together from the bottom plate and side walls of the main body, covering the entire bottom of the main body. To facilitate the discharge of liquid and sediment in the tank, the bottom surface of the return liquid tank has an incline of about 4° along the sludge discharge direction, so that the settled dust and sludge gradually gather to the lowest point under its own gravity and liquid flow. A drain outlet is opened at this lowest point for periodically discharging the sludge accumulated in the tank. In this embodiment, the drain outlet diameter is DN32, and it is connected to the external drain pipeline in the form of an internally threaded short pipe to ensure sealing and convenient connection during discharge. A DN20 diameter overflow short pipe is opened on the top surface of the return liquid tank, which is positioned directly opposite and coaxially arranged with the discharge short pipe outlet of the upper liquid-throwing ring tank. This overflow pipe acts as an interface for the return channel, allowing liquid overflowing from the annular collection tank to fall directly into the return tank. At the same time, when the liquid level in the return tank rises abnormally, a portion of the liquid can overflow back into the main body through this short pipe to prevent the liquid level from becoming too high.

[0024] Spraying and Circulation: Liquid in the return tank is drawn to the suction port of the circulation pump through a set suction pipe. The circulation pump is installed on the lower outer side of the main body and connected to the suction pipe through a pipeline; a corrosion-resistant centrifugal water pump can be selected. The pump's pressure outlet delivers liquid to the nozzles above the inside of the washing chamber through a pipeline. In this embodiment, multiple nozzles are arranged around the top of the washing chamber, evenly covering the entire cross-section of the chamber to ensure that the spray liquid is fully sprayed into the dust-laden airflow. The nozzles spray towards the inside of the washing chamber, preferably spraying downwards in a cone-shaped atomized water curtain, so that the droplets fully contact the rising or entering dust-laden airflow. The spray liquid is water or a solution with added dust removal agent, which is recycled to save water. When the spray liquid is sprayed from the nozzles, it forms a fine water mist in the washing chamber, which mixes with the dust-laden gas, causing the dust particles to be wetted and captured by the water mist, forming dust-laden droplets. These dust-laden droplets settle downwards under gravity, while some are carried by the airflow to the area where the centrifugal screen is located. The rotating centrifugal screen separates the airflow: on one hand, larger dust-laden droplets and some uncaptured dust collide with the screen surface, are flung against the screen cylinder wall by centrifugal force, and exit the cylinder through the screen holes into the annular liquid collection tank; on the other hand, the airflow enters the discharge hopper through the screen holes or the lower end of the screen cylinder. Thus, the centrifugal screen achieves the first separation of liquid and solid—the liquid is retained and recovered, while fine solids are allowed to pass through and enter the next cycle. The ejected liquid is collected in the annular tank and flows into the return liquid tank, where most of the entrained dust settles, thus removing dust from the airflow and enriching it within the tank. The liquid collected in the return liquid tank is then pumped back to the nozzles for spraying, and this cycle repeats, achieving liquid recycling in wet dust removal. It is necessary to periodically discharge some sludge through the drain outlet and replenish with clean water to maintain the cleanliness and stability of the liquid path.

[0025] This equipment utilizes a multi-stage dust removal principle combining airflow and liquid circulation to efficiently purify dust-laden gas. The specific working process is as follows: Dust-laden gas enters the spray zone: The dust-laden gas enters the main washing chamber through the inlet. At this time, nozzles located at the top of the washing chamber continuously spray atomized washing liquid, forming a falling water mist curtain. As the dust-laden gas passes through the water mist curtain, a large amount of dust is captured by the impact of water droplets, and the dust particles agglomerate into larger dust-laden droplets after their surfaces are wetted. This step is equivalent to the first dust removal, using inertial collision and agglomeration mechanisms to remove most of the coarser dust particles.

[0026] Initial liquid-solid separation: Dust-laden droplets settle under gravity and move downwards with the airflow into the high-speed rotating centrifugal sieve area. The centrifugal sieve, driven by a motor, rotates at high speed, applying a centrifugal force field to the passing mixture. Larger dust-laden droplets and partially undried dust particles are thrown towards the cylinder wall by the centrifugal force, passing through the sieve holes and exiting the main airflow. The thrown-out liquid is captured and collected by an annular collection tank adjacent to the sieve cylinder. The airflow continues to flow downwards through the sieve holes. Through this centrifugal separation process, a second dust removal and gas-liquid separation are achieved: most of the dust, already adhering to the droplets, is captured and thrown out, separating from the airflow, and the water content in the airflow is significantly reduced.

[0027] Gas-solid recirculation reprocessing: After separation by the centrifugal sieve, the remaining airflow converges into the hopper below the centrifugal sieve. A blower draws this airflow from the hopper and forces it into the external circulating air duct. The airflow rises along the circulating air duct and re-enters the upper space of the washing chamber from its top. In this way, the gas that is not yet fully purified is not directly discharged from the equipment but is guided back to the spray area for further cleaning. Because the dust concentration has been greatly reduced in the preceding process, the remaining dust content decreases with each cycle, and repeated cycles further improve the collection efficiency of fine dust. This closed-loop gas-solid circulation constitutes a multi-layer circulating dust removal system. After multiple cycles, the dust content in the gas approaches a very low level. When it is necessary to discharge purified gas, the clean airflow can be drawn out from the outlet located at the top of the washing chamber and discharged into the atmosphere or subsequent processing units; alternatively, a portion of the purified gas can be intermittently extracted as output by controlling the operation of the blower.

[0028] Liquid circulation and recovery: The dust-laden liquid ejected by the centrifugal screen overflows into the return tank via the annular trough. The dust contained within settles in the return tank, forming sludge at the bottom. The cleaner upper layer of liquid is drawn out by the circulation pump through the extraction pipe and re-poured to the nozzles for spraying. This constitutes a liquid circulation loop, ensuring the repeated use of the washing liquid and significantly reducing water consumption. Simultaneously, the settled sludge is periodically discharged through the bottom drain and fresh washing liquid is replenished, maintaining the stability of the liquid circulation and the dust removal effect. Throughout the operation, liquid circulation and gas circulation complement each other: liquid circulation continuously provides new washing media to capture dust, while gas circulation ensures that uncaptured dust passes through the washing area multiple times until it is captured, achieving a multi-layered, repeated dust removal and purification process.

[0029] In summary, the present invention has been described in detail through the above embodiments regarding its structural composition, working principle, and advantages. It should be emphasized that the above embodiments and modifications are merely illustrative to aid in understanding the present invention and are not intended to limit the invention. Those skilled in the art, after reading the specification, can make various changes and equivalent substitutions to the specific structure and process based on the concept of the present invention. Such changes, as long as they do not depart from the spirit of the present invention, should be covered within the scope of protection claimed by the present invention.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A multi-layer circulating wet dust removal integrated equipment, comprising a main body (1), characterized in that: A washing chamber (2) is provided on the upper inner side of the main body (1), and a feed inlet (3) is provided on the side wall of the main body (1) and communicates with the washing chamber (2); A motor (4) is fixedly installed on the outside of the main body (1). The motor (4) is driven by a drive shaft assembly (5) that passes through the side wall of the main body (1). The inner end of the drive shaft assembly (5) is fixedly connected to a centrifugal sieve (6) located below the washing chamber (2). The centrifugal sieve (6) is provided with a liquid-throwing ring hole (7) on its outer periphery, and the liquid-throwing ring hole (7) is connected to the return tank (11) located at the lower part of the main body (1); The centrifugal sieve (6) is provided with a discharge hopper (8) below it. The discharge hopper (8) is connected to the air inlet side of the fan (10) arranged on the outside of the main body (1). The air outlet side of the fan (10) is connected to the circulation duct (9) arranged vertically along the outside of the main body (1). The upper end of the circulation duct (9) is connected to the upper space of the washing chamber (2), thereby forming a gas-solid circulation channel from the discharge hopper (8) through the fan (10) and the circulation duct (9) back to the washing chamber (2). The return tank (11) is connected to the suction port of the circulation pump (12) through the suction pipe (13). The discharge port of the circulation pump (12) is connected to the nozzle (14) arranged in the washing chamber (2). The nozzle (14) sprays towards the washing chamber (2). The sprayed liquid is thrown into the throwing ring hole (7) through the centrifugal sieve (6) and flows back to the return tank (11).

2. The multi-layer circulating wet dust removal integrated equipment according to claim 1, characterized in that: The drive shaft assembly (5) includes a through-wall bushing welded and fixed to the side wall of the main body (1), a bearing seat connected to the inner end of the bushing by bolts, and a mechanical seal disposed between the bearing seat and the centrifugal screen (6). The drive shaft assembly (5) is connected to the motor (4) by a coupling. The diameter of the drive shaft is 20-40mm, and the inner hole of the bushing and the drive shaft are fitted with H7 / h6.

3. The multi-layer circulating wet dust removal integrated equipment according to claim 1, characterized in that: The centrifugal sieve (6) is a cylindrical sieve structure with straight sieve holes evenly distributed along the circumference of the cylinder wall. The sieve hole diameter is 1.0 to 3.0 mm and the hole spacing is 6 to 12 mm. The upper end of the centrifugal sieve (6) is connected to the end of the transmission shaft assembly (5) through a flange, and the lower end is provided with a downward guide cone and is coaxially arranged with the discharge hopper (8).

4. The multi-layer circulating wet dust removal integrated equipment according to claim 1, characterized in that: The liquid-receiving ring hole (7) is an annular liquid-collecting tank set on the outer periphery of the centrifugal sieve (6). The liquid-collecting tank is fixed to the inner wall of the main body (1) by welding. The bottom of the tank has a slope of 2 to 4 degrees along the return direction and multiple rows of overflow holes are opened. The diameter of a single overflow hole is 8 to 12 mm and the hole spacing is 15 to 25 mm.

5. The multi-layer circulating wet dust removal integrated equipment according to claim 1, characterized in that: The return tank (11) is located at the bottom of the main body (1) and is integrally welded to the bottom plate of the main body (1) to form a tank. The bottom surface of the return tank (11) is set with a slope of 2 to 5 degrees along the sludge discharge direction and a DN25 to DN40 sewage outlet is opened at the lowest point. The sewage outlet is connected to the external sewage pipe by an internal thread short connection. The top surface of the return tank (11) is provided with a DN20 overflow short pipe and is coaxially arranged with the return interface of the liquid drop short pipe of the liquid throwing ring hole (7).

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