Flue gas treatment device and flue gas treatment method

Abstract

The invention relates to a flue gas treatment device and a flue gas treatment method. The flue gas treatment device comprises a tank body, a spraying unit, a filtering unit and a collecting unit, the tank body is used for bearing flue gas and providing a reaction place; the spraying unit is used for uniformly spraying ammonia water to react with the flue gas; the filtering unit is used for carrying out solid-liquid separation on mixed liquid generated after reaction and cleaning a filter screen while filtering to avoid blockage, and the collecting unit is used for collecting filtered and separated liquid and fixed substances; according to the flue gas treatment device, flue gas generated by a boiler can be subjected to efficient dust removal, desulfurization and denitration treatment, a mixed solution obtained after reaction can be filtered, solid-liquid separation and filtering are achieved, meanwhile, a filter screen can be cleaned, the filter screen can be prevented from being blocked in the long-time running process of equipment, and the service life of the equipment is prolonged. And the cleaned particles can be automatically pushed to a slag discharging position to be discharged, and the whole flue gas treatment device is compact in structure and can be suitable for small-displacement boilers.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas treatment devices, and in particular to a flue gas treatment device and a flue gas treatment method. Background Art

[0002] A boiler is a mechanical device that uses fuel or other energy to heat water or a medium and outputs heat energy for people's production and life use. During the use of the boiler, the flue gas generated by the combustion of the fuel needs to be treated to avoid polluting the atmosphere.

[0003] At present, when treating the flue gas generated by the boiler, it is necessary to first filter the particulate matter in the flue gas through dust removal equipment, and then transport the filtered flue gas to the desulfurization equipment and denitrification equipment in turn for treatment. The flue gas treatment process requires a large number of equipment, which will take up a large working space and the maintenance process is cumbersome; at the same time, the existing flue gas treatment equipment is mostly suitable for boilers with large flue gas displacement, and cannot be applied to small-displacement boilers. Summary of the invention

[0004] To this end, the technical problem to be solved by the present invention is to overcome the problem that in the prior art, when treating the flue gas generated by the boiler, it is necessary to first filter the particulate matter in the flue gas through a dust removal equipment, and then transport the filtered flue gas to the desulfurization equipment and the denitrification equipment in turn for treatment. The flue gas treatment process requires a large number of equipment, which will occupy a large working space and the maintenance process is cumbersome; at the same time, the existing flue gas treatment equipment is mostly suitable for boilers with large flue gas displacement, and cannot be applied to boilers with small displacement.

[0005] In order to solve the above technical problems, the present invention provides a flue gas treatment device, comprising: A tank body, the tank body comprising an internal cavity, the tank body being provided with a smoke inlet and an exhaust port connected to the cavity; A spray unit, the spray unit comprising a spray pipe, a water pump and an ammonia water tank, the spray pipe being arranged at the top of the cavity, the spray pipe being provided with a plurality of nozzles, the water pump being connected to the tank body, the input end of the water pump being connected to the ammonia water tank, and the output end being connected to the spray pipe; A filter unit, the filter unit comprising a rotating disk, an annular fixed part, an annular movable part, a filter screen and a driving source, the annular fixed part is arranged at the bottom of the cavity, the annular fixed part is rotatably arranged with the annular movable part, the rotating disk and a plurality of scrapers arranged around the rotating disk are rotatably arranged on the annular movable part, and the annular fixed part is connected with the filter screen arranged around the scrapers, the side of the scrapers is in contact with the side of the filter screen, the driving source is arranged in the cavity, the output end of the driving source is coaxially connected to the rotating disk, and the output end of the driving source is coaxially sleeved with a driving gear, the driving gear is meshed with a driven gear rotatably arranged at the bottom of the cavity, and the driven gear is meshed with a gear ring coaxially connected to the annular movable part; A collecting unit, wherein the collecting unit comprises a water collecting box and a sludge box, wherein the water collecting box and the sludge box are respectively arranged at the bottom of the tank body, the water collecting box is connected to a drainage hole opened at the bottom of the tank body through a drainage pipe, and the sludge box is connected to a slag discharge hole opened on the annular fixing member through a slag discharge pipe.

[0006] Preferably, the spray pipe includes a first annular pipe and a second annular pipe arranged concentrically, a plurality of connecting pipes are connected between the first annular pipe and the second annular pipe, the output end of the water pump is connected to the first annular pipe, and the plurality of nozzles are respectively and spaced apart on the second annular pipe.

[0007] Preferably, the rotating disk includes a truncated cone-shaped plate body, which is rotatably connected to the inner hole of the annular movable part, and a conical guide member is coaxially arranged on the side of the plate body facing the spray unit, and the end with a large diameter of the guide member is connected to the plate body.

[0008] Preferably, the annular movable member is rotatably connected to the annular fixed member and the plate body respectively through a plurality of balls.

[0009] Preferably, it further comprises a guide hopper, which is funnel-shaped, arranged in the cavity and located between the spray unit and the filter unit, and the end of the guide hopper with a large diameter faces the spray unit.

[0010] Preferably, a smoke inlet pipe and an exhaust pipe are respectively provided on the smoke inlet and the exhaust port, and valves are provided in the smoke inlet pipe and the exhaust pipe.

[0011] Preferably, a mounting seat corresponding to the position of the smoke inlet is arranged on the side of the tank body, an exhaust fan is arranged in the mounting seat, and the exhaust pipe is connected to the mounting seat.

[0012] Preferably, the scraper is L-shaped, one end of the scraper is connected to the side surface of the annular movable member, and the side surface of the scraper is in contact with the filter screen and the top surface of the annular fixed member at the same time.

[0013] Preferably, a plurality of legs arranged in a circular array are provided at the bottom of the tank body, and the water collecting tank and the sludge tank are both arranged between the legs.

[0014] A flue gas treatment method, using any of the flue gas treatment devices described above to treat flue gas, comprising the following steps: Step S1: Open the smoke inlet to allow the smoke to be treated to enter the tank from the exhaust port; Step S2: Turn on the water pump to spray the ammonia water in the ammonia water tank from each nozzle to react with the flue gas in the tank body to produce a mixed solution and gas, wherein the generated gas is output through the exhaust port and the mixed solution falls onto the rotating disk below; Step S3: Synchronously start the driving source, drive the rotating disk to rotate rapidly and drive the scraper to rotate slowly, the rapidly rotating rotating disk throws the mixed solution from its edge to the filter screen through centrifugal action, the filter screen filters the mixed solution, and the aqueous solution flows to the bottom of the tank body, and the particles blocked by the filter screen fall onto the annular fixing member or adhere to the filter screen, the rotating scraper scrapes the particles on the filter screen and drops them onto the annular fixing member, and drives the particles to repeatedly pass through the slag discharge holes on the annular fixing member; Step S4: Open the liquid discharge pipe and the slag discharge pipe, so that the filtered aqueous solution flows into the water collecting tank through the liquid discharge pipe, and the filtered particulate matter flows into the sludge tank through the slag discharge pipe.

[0015] The above technical solution of the present invention has the following beneficial effects compared with the prior art: A flue gas treatment device and a flue gas treatment method described in the present invention include a tank body, a spray unit, a filter unit and a collection unit; wherein the tank body is used to carry the flue gas and provide a reaction site, the spray unit is used to evenly spray ammonia water to react with substances in the flue gas; the filter unit is used to separate the solid and liquid of the mixed liquid produced after the reaction, and clean the filter screen while filtering to avoid clogging, and the collection unit is used to collect the liquid and fixed substances after filtration and separation. A flue gas treatment device of the present invention can efficiently remove ash, desulfurize and denitrate the flue gas generated by the boiler, and can filter the mixed solution obtained after the reaction to achieve solid-liquid separation, and can also clean the filter screen while filtering, which can not only avoid the filter screen from being blocked during the long-term operation of the equipment, but also can automatically push the cleaned particles to the position of the slag discharge hole, so that the filtered particles are finally collected in the sludge box through the slag discharge hole. The structure of the entire flue gas treatment device is compact, which can be applied to small-displacement boilers and has high practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein Figure 1 is a three-dimensional diagram of a flue gas treatment device according to a preferred embodiment of the present invention; Figure 2 is a schematic diagram of the overall structure of a flue gas treatment device according to a preferred embodiment of the present invention; Figure 3 is a schematic structural diagram of a filter unit of a flue gas treatment device according to a preferred embodiment of the present invention; Figure 4 2 is a schematic structural diagram of an annular fixing member of a flue gas treatment device according to a preferred embodiment of the present invention; Figure 5 2 is a schematic structural diagram of an annular movable part of a flue gas treatment device according to a preferred embodiment of the present invention; Figure 6 is a schematic structural diagram of a gear ring of a flue gas treatment device according to a preferred embodiment of the present invention; Figure 7 It is a schematic diagram of the connection structure of the annular movable part, the annular fixed part and the rotating disk of the flue gas treatment device in the preferred embodiment of the present invention.

[0017] Description of the accompanying drawings: 1. tank body; 11. drainage hole; 12. smoke inlet pipe; 13. exhaust pipe; 14. mounting base; 15. exhaust fan; 16. support leg; 2. spray unit; 21. spray pipe; 211. nozzle; 212. first annular pipe; 213. second annular pipe; 22. water pump; 23. ammonia tank; 3. filter unit; 31. rotating disk; 311. plate; 312. flow guide ; 32. Annular fixing part; 321. Slag discharge hole; 33. Annular movable part; 331. Ball; 332. Ball groove; 34. Filter; 35. Driving source; 351. Driving gear; 352. Driven gear; 36. Scraper; 37. Gear ring; 38. Rotating shaft; 4. Collection unit; 41. Water collecting tank; 42. Sludge tank; 43. Drain pipe; 44. Slag discharge pipe; 5. Guide bucket; 6. Annular baffle. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention. Embodiment 1

[0019] Reference Figure 1-Figure 7 As shown, a flue gas treatment device of the present invention comprises: The tank body 1 includes an internal cavity, and a smoke inlet and an exhaust port communicating with the cavity are respectively provided on the tank body; The spray unit 2 includes a spray pipe 21, a water pump 22 and an ammonia water tank 23. The spray pipe 21 is arranged at the top of the cavity. A plurality of nozzles 211 are arranged on the spray pipe 21. The water pump 22 is connected to the tank body 1. The input end of the water pump 22 is connected to the ammonia water tank 23, and the output end is connected to the spray pipe 21. The filter unit 3 includes a rotating disk 31, an annular fixed member 32, an annular movable member 33, a filter screen 34 and a driving source 35. The annular fixed member 32 is arranged at the bottom of the cavity. The annular movable member 33 is rotatably arranged on the annular fixed member 32. The rotating disk 31 and a plurality of scrapers 36 arranged around the rotating disk 31 are rotatably arranged on the annular movable member 33. The filter screen 34 arranged around the scrapers 36 is connected to the annular fixed member 32. The side of the scraper 36 is in contact with the side of the filter screen 34. The driving source 35 is arranged in the cavity. The output end of the driving source 35 is coaxially connected to the rotating disk 31. At the same time, the output end of the driving source 35 is coaxially sleeved with a driving gear 351. The driving gear 351 is meshed with a driven gear 352 rotatably arranged at the bottom of the cavity. The driven gear 352 is meshed with a gear ring 37 coaxially connected to the annular movable member 33. The collecting unit 4 includes a water collecting box 41 and a sludge box 42. The water collecting box 41 and the sludge box 42 are respectively arranged at the bottom of the tank body 1. The water collecting box 41 is connected to the drainage hole 11 opened at the bottom of the tank body 1 through a drainage pipe 43. The sludge box 42 is connected to the slag discharge hole 321 opened on the annular fixing member 32 through a slag discharge pipe 44.

[0020] Specifically, the tank body 1 is vertically arranged, and a smoke inlet and an exhaust port are opened on the side of the tank body 1 opposite to each other. The smoke inlet is connected to the smoke output pipe of the boiler, and the exhaust port is connected to the gas collection and processing device at the rear end; the spray pipe 21 is fixed at the top position of the cavity and is located above the smoke inlet and the exhaust port, and a plurality of nozzles 211 arranged in an array are arranged at the bottom of the spray pipe 21; a guide hopper 5 is arranged below the nozzle 211, and the guide hopper 5 is located below the smoke inlet and the exhaust port, and the guide hopper 5 is used to receive and guide the ammonia water sprayed from the spray pipe 21 and the mixed solution obtained after the reaction of the ammonia water and the flue gas. The filter unit 3 is arranged below the guide bucket 5, and its driving source 35 is installed at the bottom of the cavity. The annular fixing member 32 is coaxially arranged between the guide bucket 5 and the driving source 35. An annular movable member 33 coaxial with the annular fixing member 32 is rotatably connected in the inner hole of the annular fixing member 32, and a rotating disk 31 coaxial with the annular movable member 33 is rotatably connected in the inner hole of the annular movable member 33. A plurality of scrapers 36 arranged around the rotating disk 31 are also arranged on the side of the annular movable member 33. The plurality of scrapers 36 are surrounded by the filter screen 34 arranged around the side of the annular fixing member 32. The rotating disk 31 is coaxially connected to the output end of the driving source 35 located below it, and a driven gear 352 located on one side of the driving source 35 is rotatably connected at the bottom of the cavity through a rotating shaft 38. The driven gear 352 is meshed with the driving gear 351 installed at the output end of the driving source 35, and is meshed with the gear ring 37 coaxially connected to the bottom of the annular movable member 33. The water collecting box 41 and the sludge box 42 are arranged at the bottom of the tank body 1 . The water collecting box 41 is connected to the bottom of the tank body 1 through a drain pipe 43 . The sludge box 42 is connected to a slag discharge hole 321 provided on the annular fixing member 32 through a slag discharge pipe 44 .

[0021] A flue gas treatment device of the present invention can efficiently remove ash, desulfurize and denitrate the flue gas generated by the boiler, and can filter the mixed solution obtained after the reaction to achieve solid-liquid separation. The filter screen 34 can also be cleaned during the filtering, which can not only prevent the filter screen 34 from being blocked during the long-term operation of the equipment, but also automatically push the cleaned particles to the position of the slag discharge hole 321, so that the filtered particles are finally collected in the sludge box 42 through the slag discharge hole 321. The entire flue gas treatment device has a compact structure, can be applied to small-displacement boilers, and has high practicality.

[0022] Reference Figure 2As shown, further, the spray pipe 21 includes a first annular pipe 212 and a second annular pipe 213 arranged concentrically, a plurality of connecting pipes are connected between the first annular pipe and the second annular pipe, the output end of the water pump 22 is connected to the first annular pipe, and a plurality of nozzles 211 are arranged on the second annular pipe at intervals. Specifically, the outer diameter of the first annular pipe is smaller than the outer diameter of the second annular pipe, the side of the second annular pipe is connected to the inner wall of the tank body 1, and the first annular pipe is coaxially connected to the second annular pipe through a plurality of connecting pipes uniformly arranged around its circumference; the first annular pipe is connected to the output end of the water pump 22 through a water pipe, and a plurality of vertically downward nozzles 211 are vertically connected to the bottom of the second annular pipe, and the plurality of nozzles 211 are uniformly arranged along the second annular pipe. The nozzle 211 adopts a nozzle 211 that can spray fan-shaped water flow, and the nozzle 211 can spray a fan-shaped ammonia water curtain to increase the contact area between the ammonia water and the flue gas, so that the ammonia water and the flue gas can fully contact and react, and better realize the ash removal, desulfurization and denitrification operations of the flue gas.

[0023] Reference Figure 3 As shown, further, the rotating disk 31 includes a truncated cone-shaped plate body 311, the plate body 311 is rotatably connected to the inner hole of the annular movable member 33, and a conical guide member 312 is coaxially arranged on the surface of the plate body 311 facing the spray unit 2, and the end of the guide member 312 with a large diameter is connected to the plate body 311. Specifically, the guide member 312 is coaxially arranged with the guide bucket 5, and after the mixed liquid guided by the guide bucket 5 flows to the top of the guide member 312, the inclined surface of the guide member 312 can play a secondary guiding role on the mixed liquid, and the mixed liquid is evenly guided to the rotating disk 31.

[0024] Reference Figure 7 As shown, further, the annular movable member 33 is rotatably connected to the annular fixed member 32 and the plate body 311 through a plurality of balls 331. Specifically, ball grooves 332 are symmetrically provided on both sides of the annular movable member 33, and the annular fixed member 32 and the plate body 311 are also provided with ball grooves 332 for use in conjunction with each other, and the rotatable connection is achieved through the cooperation between the ball grooves 332 and the balls 331.

[0025] Reference Figure 1 and Figure 2 As shown, further, it also includes a guide hopper 5, which is funnel-shaped, arranged in the cavity and located between the spray unit 2 and the filter unit 3, and the end of the guide hopper 5 with a large diameter faces the spray unit 2. The outer diameter of the guide hopper 5 matches the inner diameter of the tank body 1.

[0026] Furthermore, a smoke inlet pipe 12 and an exhaust pipe 13 are respectively provided on the smoke inlet and the exhaust port, and valves are provided in the smoke inlet pipe 12 and the exhaust pipe 13 .

[0027] Furthermore, a mounting seat 14 corresponding to the position of the smoke inlet is provided on the side of the tank body 1, an exhaust fan 15 is provided in the mounting seat 14, and the exhaust pipe 13 is connected to the mounting seat 14. The exhaust fan 15 can accelerate the circulation of gas. Specifically, the driving source 35, the water pump 22, and the exhaust fan 15 are all connected to the controller and the power supply through wires, and each component can be automatically controlled by the controller. In addition, a guide hole for the wire routing is provided on the tank body 1, and a sealant is provided in the guide hole for filling, which plays the role of sealing and fixing the wire.

[0028] Furthermore, the scraper 36 is L-shaped, one end of the scraper 36 is connected to the side of the annular movable part 33, and the side of the scraper 36 is in contact with the filter screen 34 and the top surface of the annular fixing part 32. Specifically, the side of the scraper 36 is in contact with the inner surface of the filter screen 34, and the bottom surface of the scraper 36 is in contact with the top surface of the annular fixing part 32; during the rotation of the scraper 36, not only can the particles attached to the filter screen 34 be scraped off, but also the particles falling on the top of the annular fixing part 32 can be pushed to the position of the slag discharge hole 321 opened thereon, so that the filtered particles are finally collected in the sludge box 42.

[0029] Furthermore, an annular baffle 6 surrounding the driving source 35, the rotating shaft 38 and the driven gear 352 is also provided at the bottom of the cavity. The annular baffle 6 can play a protective role to prevent the aqueous solution from contacting the driving motor.

[0030] Furthermore, a plurality of legs 16 arranged in a circular array are provided at the bottom of the tank body 1, and the water collecting tank 41 and the sludge tank 42 are both provided between the legs 16. Not only the space between the legs 16 is utilized to further reduce the working space occupied by the equipment, but the legs 16 can also play a certain protective role for the water collecting tank 41 and the sludge tank 42. Embodiment 2

[0031] The present invention also discloses a flue gas treatment method, which uses the flue gas treatment device of the first embodiment to treat the flue gas, comprising the following steps: Step S1: Open the smoke inlet (the smoke inlet pipe 12 is sealed and connected to the smoke outlet pipe of the boiler), so that the smoke to be treated is input into the tank body 1 from the exhaust port at a predetermined flow rate; Step S2: Turn on the water pump 22. Under the action of the water pump 22, the ammonia water in the ammonia water tank 23 is sprayed out from each nozzle 211 to react with the flue gas in the tank body 1. The sulfur dioxide and nitrogen monoxide in the flue gas fully contact and react with the ammonia water to produce ammonium sulfate solution, ammonium sulfite solution, nitrogen and water. The generated nitrogen is output to the gas collection device at the rear end through the exhaust port under the action of the exhaust fan 15 for subsequent treatment. The ammonium sulfate solution, ammonium sulfite solution and water are converged and guided by the guide bucket 5 below to form a mixed solution, which is guided to the rotating disk 31. Step S3: Synchronously start the driving source 35, drive the rotating disk 31 to rotate at a first speed and drive the scraper 36 to rotate at a second speed (the first speed is greater than the second speed), the rotating disk 31 that rotates rapidly throws the mixed solution that falls thereon from its edge to the filter screen 34 through centrifugal action, the filter screen 34 filters the mixed solution, and the aqueous solution finally flows to the bottom of the tank body 1 through the filter holes of the filter screen 34; while the particles in the mixed solution are blocked by the filter screen 34 and fall onto the annular fixing member 32 or adhere to the filter screen 34, the scraper 36 that rotates slowly scrapes the particles on the filter screen 34 onto the annular fixing member 32, and can drive the particles on the annular fixing member 32 to repeatedly pass through the slag discharge holes 321 on the annular fixing member 32; Specifically, the diameter of the driven gear 352 is larger than the diameter of the driving gear 351. During the rotation process, the transmission ratios of the two gears are different. When the driving gear 351 drives the driven gear 352 to rotate, the driving gear 351 with a small diameter rotates multiple times before the driven gear 352 with a large diameter rotates one circle, that is, the driving gear 351 rotates fast and the driven gear 352 rotates slowly. Therefore, the high-speed rotation of the rotating disk 31 and the slow rotation of the scraper 36 can be achieved by driving a driving motor, which not only realizes the centrifugal effect on the mixed solution, but also realizes the slow scraping action of the scraper 36, which meets multiple usage requirements and makes the structure of the entire equipment more compact.

[0032] Step S4: Open the liquid discharge pipe 43 and the slag discharge pipe 44 to allow the filtered aqueous solution to flow into the water collection tank 41 through the liquid discharge pipe 43 , while the filtered particulate matter flows into the sludge tank 42 through the slag discharge pipe 44 .

[0033] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A flue gas treatment device, characterized in that: include, A tank body, the tank body comprising an internal cavity, the tank body being provided with a smoke inlet and an exhaust port connected to the cavity; A spray unit, the spray unit comprising a spray pipe, a water pump and an ammonia water tank, the spray pipe being arranged at the top of the cavity, the spray pipe being provided with a plurality of nozzles, the water pump being connected to the tank body, the input end of the water pump being connected to the ammonia water tank, and the output end being connected to the spray pipe; A filter unit, the filter unit comprising a rotating disk, an annular fixed part, an annular movable part, a filter screen and a driving source, the annular fixed part is arranged at the bottom of the cavity, the annular fixed part is rotatably arranged with the annular movable part, the rotating disk and a plurality of scrapers arranged around the rotating disk are rotatably arranged on the annular movable part, and the annular fixed part is connected with the filter screen arranged around the scrapers, the side of the scrapers is in contact with the side of the filter screen, the driving source is arranged in the cavity, the output end of the driving source is coaxially connected to the rotating disk, and the output end of the driving source is coaxially sleeved with a driving gear, the driving gear is meshed with a driven gear rotatably arranged at the bottom of the cavity, and the driven gear is meshed with a gear ring coaxially connected to the annular movable part; A collecting unit, wherein the collecting unit comprises a water collecting box and a sludge box, wherein the water collecting box and the sludge box are respectively arranged at the bottom of the tank body, the water collecting box is connected to a drainage hole opened at the bottom of the tank body through a drainage pipe, and the sludge box is connected to a slag discharge hole opened on the annular fixing member through a slag discharge pipe.

2. The flue gas treatment device according to claim 1, characterized in that: The spray pipe includes a first annular pipe and a second annular pipe which are arranged concentrically, a plurality of connecting pipes are connected between the first annular pipe and the second annular pipe, the output end of the water pump is connected to the first annular pipe, and the plurality of nozzles are arranged on the second annular pipe at intervals.

3. The flue gas treatment device according to claim 1, characterized in that: The rotating disk includes a truncated cone-shaped plate body, which is rotatably connected to the inner hole of the annular movable member, and a conical guide member is coaxially arranged on one surface of the plate body facing the spray unit, and one end of the guide member with a large diameter is connected to the plate body.

4. The flue gas treatment device according to claim 3, characterized in that: The annular movable part is rotatably connected to the annular fixed part and the plate body respectively through a plurality of balls.

5. The flue gas treatment device according to claim 1, characterized in that: It also includes a guide hopper, which is funnel-shaped, arranged in the cavity and located between the spray unit and the filter unit, and the end of the guide hopper with a large diameter faces the spray unit.

6. The flue gas treatment device according to claim 1, characterized in that: The smoke inlet and the exhaust port are respectively provided with a smoke inlet pipe and an exhaust pipe, and valves are provided in the smoke inlet pipe and the exhaust pipe.

7. The flue gas treatment device according to claim 6, characterized in that: A mounting seat corresponding to the position of the smoke inlet is arranged on the side of the tank body, an exhaust fan is arranged in the mounting seat, and the exhaust pipe is connected to the mounting seat.

8. The flue gas treatment device according to claim 1, characterized in that: The scraper is L-shaped, one end of the scraper is connected to the side surface of the annular movable member, and the side surface of the scraper is in contact with the filter screen and the top surface of the annular fixing member at the same time.

9. The flue gas treatment device according to claim 1, characterized in that: The bottom of the tank body is provided with a plurality of supporting legs arranged in a circular array, and the water collecting tank and the sludge tank are both arranged between the supporting legs.

10. A flue gas treatment method, using the flue gas treatment device according to any one of claims 1 to 9 to treat flue gas, characterized in that: The following steps are included: Step S1: Open the smoke inlet to allow the smoke to be treated to enter the tank from the exhaust port; Step S2: Turn on the water pump to spray the ammonia water in the ammonia water tank from each nozzle to react with the flue gas in the tank body to produce a mixed solution and gas, wherein the generated gas is output through the exhaust port and the mixed solution falls onto the rotating disk below; Step S3: Synchronously start the driving source, drive the rotating disk to rotate rapidly and drive the scraper to rotate slowly, the rapidly rotating rotating disk throws the mixed solution from its edge to the filter screen through centrifugal action, the filter screen filters the mixed solution, and the aqueous solution flows to the bottom of the tank body, and the particles blocked by the filter screen fall onto the annular fixing member or adhere to the filter screen, the rotating scraper scrapes the particles on the filter screen and drops them onto the annular fixing member, and drives the particles to repeatedly pass through the slag discharge holes on the annular fixing member; Step S4: Open the liquid discharge pipe and the slag discharge pipe, so that the filtered aqueous solution flows into the water collecting tank through the liquid discharge pipe, and the filtered particulate matter flows into the sludge tank through the slag discharge pipe.

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