A flue gas multi-pollutant co-processing device

Abstract

The application discloses a flue gas multi-pollutant collaborative treatment device, and belongs to the technical field of flue gas treatment devices. In order to solve the problems that the existing liquid spraying treatment can cause corrosion of metal components of equipment, a large amount of wastewater can be generated by the liquid spraying, and the overall treatment cost can be increased, the application comprises a treatment tank and a gas inlet connected to one side of the treatment tank, an inner cavity is arranged in the middle of the inner side of the treatment tank, a flow pipe is communicated with one side of the bottom of the inner cavity, and a plurality of groups of dry spraying mechanisms are installed on the inner side of the inner cavity. The double-fluid spraying driven by airflow can treat various pollutants such as sulfur dioxide, nitrogen oxides and heavy metals in flue gas, the separation of large-particle dust, the separation of small dust, the adsorption of gaseous pollutants and the catalytic reaction of the gaseous pollutants can be simultaneously completed in the same cavity of the treatment tank, the treatment does not generate wastewater, additional wastewater treatment is not needed, a plurality of devices are not needed to be connected in series, and system resistance and energy consumption are reduced.

Description

Technical Field

[0001] This invention relates to the field of flue gas treatment device technology, specifically to a multi-pollutant synergistic treatment device for flue gas. Background Technology

[0002] Flue gas treatment devices are environmental protection equipment used to purify pollutants in industrial exhaust gases. They remove harmful components from flue gas through physical, chemical, or biological methods to meet environmental emission standards. Their core purpose is to reduce air pollution, and they are widely used in industries such as power, metallurgy, and chemicals.

[0003] Currently, liquid spraying is often used for flue gas treatment. When the flue gas temperature is low, the spray liquid will condense on the inner wall of the equipment, causing corrosion of metal components and clogging of filter bags. In addition, liquid spraying will generate a large amount of wastewater containing sulfur and nitrate, which requires supporting wastewater treatment systems such as neutralization tanks and sedimentation tanks, which will increase the footprint and cost. At the same time, when treating solids, series processes are often used, which will lead to an increase in overall energy consumption.

[0004] To address the above issues, a multi-pollutant synergistic treatment device for flue gas is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-pollutant co-treatment device for flue gas. By using this device, the problems mentioned above are solved, such as corrosion of metal components caused by existing liquid spraying treatment, and the increase in overall treatment costs due to the large amount of wastewater generated by liquid spraying.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-pollutant synergistic treatment device for flue gas, comprising a treatment tank and an air inlet connected to one side of the treatment tank, wherein an inner cavity is provided in the middle of the inner side of the treatment tank, and a flow pipe is connected to the bottom side of the inner cavity, wherein a plurality of dry spray mechanisms are installed above the interior of the inner cavity, and a collection chamber is provided at the bottom of the inner cavity.

[0007] A material box is installed on the top of the processing tank, and a feeding pipe is connected to one side of the material box. An air outlet pipe is connected to the upper part of the inner cavity, and a dust collector is connected to the output end of the air outlet pipe. An air pump is connected to the lower side of the dust collector, and an exhaust pipe is connected to the output end of the air pump.

[0008] Furthermore, the processing tank includes an outer cavity that communicates with the air inlet, a guide vane is fixed inside the outer cavity, an air vent is provided above the outer cavity, and an intermediate cavity is provided inside the outer cavity.

[0009] Furthermore, a dust discharge port one is provided at the bottom of the outer cavity, and a dust discharge port two is provided at the bottom of the middle cavity.

[0010] Furthermore, the flow pipe includes a bracket fixed to the inner wall of the air inlet, and a connecting shaft is rotatably connected to the middle of the bracket, with an impeller fixed to one end of the connecting shaft.

[0011] Furthermore, an impeller is fixed to the other end of the connecting shaft, and a bracket is rotatably connected to the front end of the impeller.

[0012] Furthermore, a dust filter is provided on the outer side of the connecting shaft, and connecting springs are fixed at the upper and lower ends of one side of the surface of the dust filter, and a rubber sleeve is provided at the connection between the dust filter and the surface of the flow pipe.

[0013] A fixing seat is fixed in the middle of the surface of the dust filter screen, and several arc-shaped protrusions are fixed in a ring on the surface of the fixing seat. A fixing disk is fixed on one side of the impeller, and pressing blocks are fixed on the upper and lower surfaces of the fixing disk.

[0014] Furthermore, the dry spraying mechanism includes several powder spray guns fixedly installed on the side wall of the inner cavity, and each group of powder spray guns is connected to an air guide pipe on its lower side.

[0015] Furthermore, each set of powder spray guns has an acceleration chamber in the middle of its inner side, and a powder suction pipe is connected above the acceleration chamber, with a nozzle connected to the front end of the acceleration chamber.

[0016] Furthermore, two sets of discharge pipes are installed on the lower side of one side of the material box, and the output end of the discharge pipe is connected to a diversion pipe, which is connected to the powder suction pipe.

[0017] Furthermore, the inner cavity is provided with several sets of conical covers, and the conical covers are fixedly connected to the inner wall of the inner cavity through a fixing frame.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. This invention employs a dual-fluid jet of airflow-driven powder, which can treat various pollutants such as sulfur dioxide, nitrogen oxides, and heavy metals in flue gas. Simultaneously, it completes the graded and synergistic treatment of large dust particles, fine dust particles, and gaseous pollutant adsorption and catalytic reaction within the same chamber of the treatment tank. Moreover, the treatment does not generate wastewater, requires no additional wastewater treatment, and eliminates the need for multiple devices connected in series, thus reducing system resistance and energy consumption.

[0020] 2. The present invention captures and filters fine particles in the flue gas, thereby reducing the dust content in the flue gas. After the flue gas undergoes two dust suppression treatments, the gaseous pollutants can be fully exposed and come into contact with the powder during the subsequent powder spraying process. This greatly reduces the possibility of dust and gaseous pollutants competing for the active sites of the powder adsorption, which could lead to a reduction in the effective adsorption area. This helps to ensure the high efficiency of the subsequent powder spraying process.

[0021] 3. When the airflow of the present invention flows upward in the inner cavity, it has an accelerating swirling effect, which helps to increase the path and time of flue gas flow in the inner cavity. This allows for sufficient contact and reaction time between the flue gas and the powder during subsequent powder spraying, thus ensuring the effectiveness of flue gas treatment. In addition, while accelerating the flow, it can also shake off the dust filtered on the flow pipe, preventing blockage and ensuring the dust reduction effect and smooth airflow. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall external three-dimensional structure of the present invention;

[0023] Figure 2 This is a cross-sectional view of the internal structure of the processing tank of the present invention;

[0024] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle;

[0025] Figure 4 This is a partial cross-sectional view of the internal three-dimensional structure of the inner cavity of the present invention;

[0026] Figure 5 For the present invention Figure 4 A schematic diagram of the three-dimensional structure viewed from below;

[0027] Figure 6 For the present invention Figure 4 Enlarged 3D structural diagram at point B;

[0028] Figure 7 This is a cross-sectional three-dimensional structural diagram of the air inlet of the present invention;

[0029] Figure 8 This is a cross-sectional three-dimensional structural diagram of the extrusion block and the arc-shaped protrusion after separation according to the present invention.

[0030] In the diagram: 1. Treatment tank; 11. Outer cavity; 12. Guide vane; 13. Vent; 14. Intermediate cavity; 15. Dust discharge port one; 16. Dust discharge port two; 2. Air inlet; 3. Flow pipe; 31. Support one; 32. Connecting shaft; 33. Impeller one; 34. Impeller two; 35. Support two; 36. Dust filter; 37. Connecting spring; 38. Fixing base; 39. Arc-shaped protrusion; 310. Fixing plate 311. Extrusion block; 312. Rubber sleeve; 4. Inner cavity; 5. Dry spraying mechanism; 51. Powder spray gun; 52. Air guide pipe; 53. Acceleration chamber; 54. Powder suction pipe; 55. Nozzle; 6. Collection bin; 7. Air outlet pipe; 8. Material box; 9. Feeding pipe; 10. Dust removal box; 20. Air pump; 30. Exhaust pipe; 40. Discharge pipe; 50. Fixing frame; 60. Conical cover; 70. Diverter pipe. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] To address the technical problems of existing liquid spraying treatments, such as corrosion of metal components and increased overall treatment costs due to the large amounts of wastewater generated, such as... Figure 1 - Figure 6 As shown, the following preferred technical solutions are provided:

[0033] A multi-pollutant co-treatment device for flue gas includes a treatment tank 1 and an air inlet 2 connected to one side of the treatment tank 1. The air inlet 2 is connected to an existing exhaust fan installed outside the device, which can accelerate the flue gas to be treated into the treatment tank 1. An inner cavity 4 is provided in the middle of the inner side of the treatment tank 1, and a flow pipe 3 is connected to the bottom side of the inner cavity 4. The treatment tank 1 has three chambers. The flue gas introduced into the air inlet 2 first enters the outermost chamber of the treatment tank 1. When the flue gas is in the outermost chamber of the treatment tank 1, it will be subjected to centrifugal force and obstruction, which can cause large-diameter dust particles in the flue gas to fall after being impacted by centrifugal force, thereby reducing the dust content of the flue gas. Then the flue gas will enter the middle chamber of the treatment tank 1. After circulating in the middle chamber of the treatment tank 1, the flue gas will enter the innermost inner cavity 4 through the flow pipe 3. Over time, fine particles in the flue gas will be captured and filtered, further reducing the dust content in the flue gas. After two dust suppression treatments, the gaseous pollutants can be fully exposed and come into contact with the powder during subsequent powder spraying, ensuring the high efficiency of the subsequent powder spraying process. At the same time, the flue gas is accelerated as it passes through the flow pipe 3, and the dust filtered on the flow pipe 3 is shaken off during the acceleration, which can prevent blockage and ensure the dust suppression effect and smooth ventilation. When the dust-suppressed flue gas enters the inner cavity 4, the airflow enters the inner cavity 4 vertically and tangentially, so that the accelerated airflow has a swirling effect when it flows upward in the inner cavity 4, which helps to increase the path and time of the flue gas in the inner cavity 4. This allows sufficient contact and reaction time between the flue gas and the powder during the subsequent powder spraying process, thus helping to ensure the effectiveness of the flue gas treatment.

[0034] Currently, liquid spraying is often used for flue gas treatment. However, when the flue gas temperature is low, the spray liquid condenses on the inner wall of the equipment, leading to corrosion of metal components and clogging of filter bags. This is especially common in northern winters or in low-temperature flue gas environments such as steel sintering machines. Liquid spraying also generates large amounts of sulfur- and nitrate-containing wastewater, requiring additional wastewater treatment systems such as neutralization tanks and sedimentation tanks, which increases the footprint and cost. Several sets of dry spraying mechanisms 5 are installed above the inner cavity 4. The spraying positions of the dry spraying mechanisms 5 are tilted upwards towards the inner cavity 4, and multiple sets of dry spraying mechanisms 5 can spray solid powder. The powder can be a mixture of calcium oxide, activated carbon, and manganese dioxide. When the powder is sprayed, it comes into contact with the upward-swirling flue gas in the inner cavity 4, utilizing the calcium oxide and... Activated carbon can treat various pollutants in flue gas, such as sulfur dioxide, nitrogen oxides, and heavy metals, while manganese dioxide can act as a catalyst to improve the efficiency of flue gas treatment. By using solid powder injection without the participation of liquid media, the risk of condensation is eliminated at the source, and the equipment can be protected from liquid corrosion damage. At the same time, the dry spray mechanism 5 uses airflow to drive the powder in a two-fluid injection, which can refine the powder particles and avoid agglomeration, which is conducive to ensuring the effect of flue gas treatment. Meanwhile, the treatment tank 1 completes the staged and synergistic treatment of large dust particles, fine dust particles, and gaseous pollutant adsorption and catalytic reaction in the same cavity. Moreover, no wastewater is generated, no additional wastewater treatment is required, and multiple devices do not need to be connected in series, reducing system resistance and energy consumption.

[0035] A collection chamber 6 is located at the bottom of the inner cavity 4. The collection chamber 6 can collect the solid mixture after flue gas treatment. It can also be used with an existing screw conveyor to transport and process the collected solid mixture without the need for a wastewater treatment system, significantly reducing environmental costs. Furthermore, the solid products can be recycled and utilized, generating additional revenue for the enterprise. A material box 8 is installed on the top of the treatment tank 1, and a feeding pipe 9 is connected to one side of the material box 8. The material box 8 stores the aforementioned solid powder used for treatment, providing powder material to the dry spraying mechanism 5. Simultaneously, using the feeding pipe 9 in conjunction with the existing screw conveyor, the material box 8 can be fed... The inner cavity 4 is filled with materials. An air outlet pipe 7 is connected to the upper part of the inner cavity 4, and the output end of the air outlet pipe 7 is connected to a dust collector 10. An air pump 20 is connected to the lower side of the dust collector 10, and the output end of the air pump 20 is connected to an exhaust pipe 30. The treated flue gas is introduced into the dust collector 10 through the air outlet pipe 7. The dust collector 10 is an existing bag filter dust collector with top blowing dust reduction. The dust collector 10 can filter the treated flue gas to filter and separate the powder contained in the flue gas. The air pump 20 can provide a negative pressure suction to accelerate the flow of the airflow. Finally, the treated and filtered airflow can be discharged through the exhaust pipe 30.

[0036] The dry spraying mechanism 5 includes several powder spray guns 51 fixedly installed on the side wall of the inner cavity 4, and each group of powder spray guns 51 is connected to an air guide pipe 52 on one side below. The air guide pipe 52 is connected to the existing high-pressure air equipment outside the device, and can introduce high-pressure airflow into the powder spray guns 51, thereby providing power for powder spraying.

[0037] Each powder spray gun 51 has an acceleration chamber 53 located in the middle of its inner side, and a powder suction pipe 54 is connected to the top of the acceleration chamber 53. A nozzle 55 is connected to the front end of the acceleration chamber 53, and the nozzle 55 is angled upwards towards the inner cavity 4. The powder suction pipe 54 contains a mixture of calcium oxide, activated carbon, and manganese dioxide powder. When a high-pressure airflow exits from the acceleration chamber 53, it generates a suction force on the powder in the powder suction pipe 54, causing the powder to be sprayed from the nozzle 55 into the inner cavity 4. The calcium oxide and activated carbon in the powder can be used to treat sulfur dioxide and nitrogen oxides in the flue gas. It treats various pollutants such as heavy metals, while manganese dioxide can act as a catalyst to improve the efficiency of powder and flue gas treatment. By using solid powder spraying without the participation of liquid media, the risk of condensation is eliminated at the source, and the equipment can be protected from liquid corrosion damage. At the same time, the powder spray gun 51 uses airflow to drive the powder in a two-fluid spray, which can refine the powder particles and avoid the problem of powder agglomeration, which helps to ensure the effect of flue gas treatment. Moreover, no wastewater is generated during the treatment, eliminating the need for additional wastewater treatment and multiple devices in series, thus reducing system resistance and energy consumption.

[0038] Two sets of discharge pipes 40 are installed on the lower side of one side of the material box 8, and the output end of the discharge pipe 40 is connected to the diversion pipe 70. The diversion pipe 70 is connected to the powder suction pipe 54. The discharge pipe 40 is equipped with a screw conveyor of the existing principle, which can pass the solid powder stored in the material box 8 for reaction into the powder suction pipe 54 through the diversion pipe 70, thereby providing material transportation for the powder spraying process.

[0039] The inner cavity 4 is equipped with several sets of conical hoods 60, which are fixedly connected to the inner wall of the inner cavity 4 via a fixing bracket 50. The conical hoods 60 are positioned with their cone bottoms facing downwards and are located below each set of powder spray guns 51. A gap is left between the conical hoods 60 and the inner wall of the inner cavity 4. When the swirling flue gas in the inner cavity 4 rises, the airflow of the swirling part will rise through the gap between the conical hoods 60 and the inner cavity 4, allowing the swirling airflow to have sufficient flow path and flow time within the inner cavity 4, ensuring sufficient contact reaction time and effect with the powder. At the same time, the vertically rising airflow from the center of the inner cavity 4 is blocked by the conical hoods 60, allowing the airflow to be buffered and slowed down by the conical hoods 60 before it can flow out of the conical hoods 60. As the airflow continues to flow upwards from the edge of the conical hood 60, the vertically flowing airflow, after being decelerated by the conical hood 60, can also prolong its residence time in the inner cavity 4. This allows the airflow entering the inner cavity 4 to undergo sufficient reaction and treatment, ensuring the effectiveness of flue gas treatment. At the same time, the conical hood 60 can catch the falling powder, allowing the powder to be buffered by the top surface of the conical hood 60 and finally fall along the bottom edge of the conical hood 60, thereby prolonging the residence time of the powder in the inner cavity 4 and allowing the powder to undergo sufficient reaction. Meanwhile, the powder falling along the bottom edge of the conical hood 60 will meet and contact the airflow flowing upwards from the edge of the conical hood 60, further enhancing the full reaction between the powder and the airflow, thereby improving the flue gas treatment effect.

[0040] To address the technical challenges of dust content in flue gas competing for active adsorption sites during powder coating, thus reducing the effective adsorption area, and the increased system resistance and energy consumption resulting from multiple devices connected in series, such as… Figure 1 , Figure 2 and Figure 7 As shown, the following preferred technical solutions are provided:

[0041] The treatment tank 1 includes an outer cavity 11 connected to the air inlet 2. Guide vanes 12 are fixed inside the outer cavity 11, arranged in multiple annular groups within the outer cavity 11. The guide vanes 12 are inclined and can guide the flue gas to form a swirling flow. An air vent 13 is provided above the outer cavity 11, and an intermediate cavity 14 is provided inside the outer cavity 11. A sandwich wall is provided between the outer cavity 11 and the intermediate cavity 14, and the guide vanes 12 are fixed to the sandwich wall. The air vent 13 is also located on the sandwich wall. The flue gas introduced into the air inlet 2... The flue gas is first introduced into the outer cavity 11. When the flue gas is in the outer cavity 11, it will be subjected to the centrifugal force of the guide vanes 12 and the blocking effect, which will cause large-diameter dust particles in the flue gas to fall after being impacted by the centrifugal force, thereby reducing the dust content of the flue gas. This will prevent large-diameter dust particles from mixing and agglomerating with the sprayed powder during subsequent powder spraying, which could easily cause blockage and affect the flue gas adsorption effect. The flue gas after dust settling in the outer cavity 11 can be introduced into the middle cavity 14 through the vent 13. The middle cavity 14 and the inner cavity 4 are also provided with a sandwich wall.

[0042] A dust discharge port 15 is provided at the bottom of the outer cavity 11. This port can be opened during regular maintenance to treat the dust accumulation in the outer cavity 11. After flowing through the intermediate cavity 14, the flue gas enters the innermost inner cavity 4 through the flow pipe 3. As the flue gas passes through the flow pipe 3, fine particles in the flue gas are captured and filtered, further reducing the dust content. This double dust reduction process allows gaseous pollutants to be fully exposed and in contact with the powder during subsequent powder coating, significantly reducing competition between dust and gaseous pollutants in the flue gas. The active sites for adsorbing powder may reduce the effective adsorption area, which helps ensure the high efficiency of subsequent powder spraying. At the same time, the flow pipe 3 and the inner cavity 4 are vertically tangentially connected, so that the airflow has a swirling effect when flowing upward in the inner cavity 4, which helps to increase the path and time of flue gas flow in the inner cavity 4, so that the flue gas can have sufficient contact reaction time with the powder during subsequent powder spraying. The bottom of the intermediate cavity 14 is provided with a dust discharge port 2 16, which can be opened during regular maintenance to treat the dust in the intermediate cavity 14.

[0043] To address the technical problem that particles in the airflow easily become clogged during powder coating treatment, resulting in insufficient airflow velocity and thus affecting the flue gas treatment effect, such as... Figure 1 , Figure 2 as well as Figure 7 and Figure 8 As shown, the following preferred technical solutions are provided:

[0044] The flow pipe 3 includes a bracket 31 fixed to the inner wall of the air inlet 2, and a connecting shaft 32 is rotatably connected to the middle of the bracket 31. An impeller 33 is fixed to one end of the connecting shaft 32. After being accelerated by the existing exhaust fan outside the device, the flue gas in the treatment tank 1 is introduced into the air inlet 2. The airflow will generate a rotational force on the impeller 33, so that the impeller 33 can drive the connecting shaft 32 to rotate.

[0045] Impeller 2 34 is fixed to the other end of connecting shaft 32. Impeller 2 34 is set inside flow pipe 3. When impeller 1 33 drives connecting shaft 32 to rotate, it can synchronously drive impeller 2 34 to rotate. The front end of impeller 2 34 is rotatably connected to bracket 2 35. Bracket 2 35 is fixed to the inner wall of flow pipe 3. Using bracket 2 35 and bracket 1 31, connecting shaft 32, impeller 1 33 and impeller 2 34 can be supported, so that impeller 1 33 and impeller 2 34 can rotate stably. When impeller 2 34 rotates in flow pipe 3, it can accelerate and guide the airflow in flow pipe 3. At the same time, the middle of the inner wall of flow pipe 3 is narrowed, so that the airflow entering the inner cavity 4 from flow pipe 3 can be accelerated. This allows the accelerated tangential airflow entering the inner cavity 4 to have a better swirling effect, so as to ensure the effect of subsequent powder spraying.

[0046] A dust filter 36 is provided on the outer side of the connecting shaft 32. The dust filter 36 is a fine-pore metal filter. The dust filter 36 is located at the air inlet end of the flow pipe 3, and the dust filter 36 is rotatably sealed with the connecting shaft 32. Using the dust filter 36, when the airflow enters the flow pipe 3, it can be treated to reduce dust, thereby further reducing the particles in the flue gas. Connecting springs 37 are fixed at the upper and lower ends of one side of the surface of the dust filter 36. The dust filter 36 is elastically connected to the flow pipe 3 through the connecting springs 37. A rubber sleeve 312 is provided at the surface connection between the dust filter 36 and the flow pipe 3. The elastically expandable rubber sleeve 312 can seal the edge gaps when the dust filter 36 and the flow pipe 3 elastically expand and contract, thereby preventing the problem of filtered particles escaping.

[0047] A fixing seat 38 is fixed in the middle of the surface of the dust filter 36, and several arc-shaped protrusions 39 are fixed in a ring on the surface of the fixing seat 38. A fixing disk 310 is fixed on one side of the impeller 34, and pressing blocks 311 are fixed on the upper and lower surfaces of the fixing disk 310. The surface of the pressing block 311 is arc-shaped and the pressing block 311 is arranged between the arc-shaped protrusions 39. When the impeller 34 drives the fixing disk 310 and the pressing block 311 to rotate, the pressing block 311 will continuously squeeze through the multiple sets of arc-shaped protrusions 39, so that the dust filter 36 will be intermittently pushed and rebounded by the connecting spring 37, so that there will be a vibration effect between the dust filter 36 and the flow pipe 3, which can shake off the dust filtered on the dust filter 36, avoid the dust filter 36 from being blocked for a long time, ensure the dust reduction effect of the dust filter 36 on the flue gas, and ensure the smooth flow of the dust filter 36 during ventilation, thus ensuring the effect of subsequent flue gas treatment.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-pollutant co-treatment device for flue gas, comprising a treatment tank (1) and an air inlet (2) connected to one side of the treatment tank (1), characterized in that: The processing tank (1) has an inner cavity (4) in the middle of its inner side, and a flow pipe (3) is connected to the bottom side of the inner cavity (4). Several sets of dry spraying mechanisms (5) are installed in the upper part of the inner cavity (4), and a collection chamber (6) is provided at the bottom of the inner cavity (4). The top of the processing tank (1) is equipped with a material box (8), and a feeding pipe (9) is connected to one side of the material box (8). An air outlet pipe (7) is connected to the top of the inner cavity (4), and a dust collector (10) is connected to the output end of the air outlet pipe (7). An air pump (20) is connected to the lower side of one side of the dust collector (10), and an exhaust pipe (30) is connected to the output end of the air pump (20). The processing tank (1) includes an outer cavity (11) that communicates with the air inlet (2). A guide vane (12) is fixed inside the outer cavity (11). An air vent (13) is opened above the outer cavity (11), and an intermediate cavity (14) is provided inside the outer cavity (11). The bottom of the outer cavity (11) is provided with a dust discharge port one (15), and the bottom of the middle cavity (14) is provided with a dust discharge port two (16). The flow pipe (3) includes a bracket (31) fixed to the inner wall of the air inlet (2), and a connecting shaft (32) is rotatably connected to the middle of the bracket (31), and an impeller (33) is fixed to one end of the connecting shaft (32). The other end of the connecting shaft (32) is fixed with an impeller (34), and the front end of the impeller (34) is rotatably connected to a bracket (35). A dust filter (36) is provided on the outer side of the connecting shaft (32). A connecting spring (37) is fixed at the upper and lower ends of one side of the surface of the dust filter (36), and a rubber sleeve (312) is provided at the connection between the dust filter (36) and the surface of the flow pipe (3). A fixing seat (38) is fixed in the middle of the surface of the dust filter (36), and a number of arc-shaped protrusions (39) are fixed in a ring on the surface of the fixing seat (38). A fixing disk (310) is fixed on one side of the impeller (34), and a pressing block (311) is fixed above and below the surface of the fixing disk (310). The dry spraying mechanism (5) includes several powder spray guns (51) fixedly installed on the side wall of the inner cavity (4), and each group of powder spray guns (51) is connected to an air guide pipe (52) on one side below. Each powder spray gun (51) has an acceleration chamber (53) in the middle of its inner side, and a powder suction pipe (54) is connected above the acceleration chamber (53). The front end of the acceleration chamber (53) is connected to a nozzle (55). Two sets of discharge pipes (40) are installed on one side of the material box (8), and the output end of the discharge pipe (40) is connected to a diversion pipe (70), and the diversion pipe (70) is connected to the powder suction pipe (54); The flue gas introduced into the inlet (2) will first enter the outer cavity (11). When the flue gas is in the outer cavity (11), it is affected by the centrifugal force of the guide vane (12) and the obstruction, which allows the large-diameter dust particles in the flue gas to fall after being impacted by the centrifugal force. The flue gas after dust settling in the outer cavity (11) is introduced into the middle cavity (14) through the air inlet (13). After the flue gas flows in the middle cavity (14), it enters the innermost inner cavity (4) through the flow pipe (3). When the impeller (34) drives the fixed disk (310) and the extrusion block (311) to rotate, the extrusion block (311) will continuously squeeze through the multiple sets of arc-shaped protrusions (39), so that the dust filter (36) is intermittently pushed and rebounded by the connecting spring (37), thus creating a vibration effect between the dust filter (36) and the flow pipe (3).

2. The multi-pollutant synergistic treatment device for flue gas according to claim 1, characterized in that: The inner cavity (4) is provided with several sets of conical covers (60), and the conical covers (60) are fixedly connected to the inner wall of the inner cavity (4) through a fixing frame (50).

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