An exhaust gas purification device for carbon dioxide recovery and its purification method

Abstract

The present invention relates to the technical field of carbon dioxide recovery and waste gas purification, and particularly relates to a waste gas purification device for carbon dioxide recovery and its purification method. A waste gas purification device for carbon dioxide recovery includes a housing assembly and also includes a slag removal assembly. The slag removal assembly includes a fixed cylinder and a rotating member. The rotating member includes a slag removal motor, a first stirring plate, and a second stirring plate. A fan-shaped housing is fixedly installed at the bottom of the outer cylinder. A water outlet part is arranged at the bottom of the fan-shaped housing. A collection member is arranged inside the fan-shaped housing. A waste gas purification method for carbon dioxide recovery includes steps such as spraying and purification. The advantages are as follows: During the waste gas purification process, the precipitates in the lime water are continuously removed, avoiding the negative impact of precipitate accumulation on the sulfur dioxide removal efficiency, effectively purifying the sulfur dioxide in the waste gas, reducing its corrosion to the subsequent carbon dioxide recovery equipment, and improving the reliability and safety of the entire waste gas treatment system.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide recovery and waste gas purification, and particularly relates to an exhaust gas purification device for carbon dioxide recovery and a purification method thereof. Background Art

[0002] When recovering carbon dioxide from flue gas, the flue gas usually contains a large amount of sulfur dioxide. Sulfur dioxide is a corrosive gas that can react with water to form sulfurous acid, which is then oxidized to sulfuric acid. These acidic substances will cause serious corrosion to the recovery equipment, affecting the service life and safety of the equipment. Through effective desulfurization treatment, the content of sulfur dioxide in the flue gas can be significantly reduced, the corrosion effect on the equipment can be alleviated, and the integrity and stability of the equipment can be protected. In addition, sulfur dioxide in the flue gas will contaminate the recovered carbon dioxide, reducing its purity and quality.

[0003] Currently, a traditional exhaust gas purification device for carbon dioxide recovery usually uses lime water to remove sulfur dioxide from the exhaust gas. The main component of lime water is calcium hydroxide, which will form a precipitate when reacting with sulfur dioxide in the exhaust gas. Over time, the formed precipitate will continuously accumulate at the bottom of the reaction vessel. The increase in the precipitate will occupy the space of the reaction vessel, reducing the volume of the calcium hydroxide solution that can participate in the reaction and lowering the purification efficiency of the exhaust gas. In addition, the accumulation of the precipitate will also affect the distribution and flow of the gas in the reaction vessel. Directly shutting down the equipment for precipitate removal means that the exhaust gas cannot be purified during this period, thus affecting the continuity and stability of the production line and bringing unnecessary losses to the production, making the practicality of the equipment poor. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem of poor practicality of the equipment in the prior art, and to propose an exhaust gas purification device for carbon dioxide recovery and a purification method thereof.

[0005] In order to achieve the above purpose, the present invention adopts the following technical scheme:

[0006] An exhaust gas purification device for carbon dioxide recovery, including a housing assembly. The housing assembly includes an outer cylinder. The top of the outer cylinder is fixedly communicated with an air outlet pipe. The bottom of the outer cylinder is fixedly installed with support columns. The side wall of the outer cylinder is fixedly communicated with an air inlet pipe. It further includes:

[0007] Dross removal component, the dross removal component includes a fixed cylinder and a rotating member, the fixed cylinder is fixedly installed at the bottom of the outer cylinder, the rotating member includes a dross removal motor, a first stirring plate and a second stirring plate, the dross removal motor is fixedly installed at the bottom of the fixed cylinder, the output shaft of the dross removal motor is fixedly connected with a rotating plate, the outer wall of the rotating plate is slidably connected with a rotating shaft, the fixed cylinder is used for accommodating the rotating shaft, the first stirring plate is fixedly installed on the side wall of the rotating shaft, a receiving groove for accommodating the first stirring plate is opened at the top of the second stirring plate, and the first stirring plate is slidably connected with the receiving groove;

[0008] A sector-shaped housing is fixedly installed at the bottom of the outer cylinder, a water outlet part is arranged at the bottom of the sector-shaped housing, a collecting component is arranged inside the sector-shaped housing, the collecting component includes a third electric telescopic rod fixedly installed at the bottom of the inner wall of the sector-shaped housing, the top of the third electric telescopic rod is fixedly connected with a sector-shaped plate for closing the sector-shaped housing, the bottom of the sector-shaped plate is fixedly connected with a second mounting frame, a first mounting frame is arranged on the side wall of the second mounting frame, and wire meshes are respectively arranged on the side walls of the first mounting frame and the second mounting frame.

[0009] Preferably, a first sliding groove is opened at the bottom of the inner wall of the outer cylinder, a trapezoidal slider is fixedly installed at the bottom of the second stirring plate, and the trapezoidal slider is slidably connected with the first sliding groove. A trapezoidal sliding strip is fixedly installed on the side wall of the second mounting frame, and the trapezoidal sliding strip is slidably connected with the first mounting frame. A second sliding groove is opened on the side wall of the first mounting frame, a trapezoidal sliding block is fixedly installed on the side wall of the second mounting frame, and the trapezoidal sliding block is slidably connected with the second sliding groove.

[0010] Preferably, it further includes a spraying component, the spraying component includes a communicating pipe fixedly communicated with the side wall of the outer cylinder, the end of the communicating pipe is fixedly communicated with a spray head, and the spray head is located above the second stirring plate.

[0011] Preferably, it further includes a dispersing component, the dispersing component includes a first dispersing disk and a second dispersing disk, a first electric telescopic rod is fixedly installed on the inner wall of the outer cylinder, the first dispersing disk is fixedly installed at the bottom of the first electric telescopic rod, the bottom of the first dispersing disk is rotationally connected with the second dispersing disk through a rotating ring, the first dispersing disk is located below the spray head, and the second dispersing disk is located above the pipe orifice of the air inlet pipe.

[0012] Preferably, a fixed disk is fixedly installed at the bottom of the second dispersing disk, the fixed disk is rotationally connected to the top of the rotating shaft, a plurality of strip-shaped first dispersing holes are formed through the top of the first dispersing disk, a plurality of strip-shaped second dispersing holes are formed through the top of the second dispersing disk, and the shapes and sizes of the first dispersing holes and the second dispersing holes are the same. The plurality of first dispersing holes and the plurality of second dispersing holes are perpendicular to form a grid-like hole.

[0013] Preferably, four arc-shaped guide grooves for controlling the second dispersion plate to rotate 90° are provided on the inner wall of the outer cylinder. Four embedding rods are fixedly installed on the side wall of the second dispersion plate. The four embedding rods are circumferentially and arrayedly distributed on the side wall of the second dispersion plate, and the four embedding rods are respectively slidably connected with the four arc-shaped guide grooves.

[0014] Preferably, it further includes a scraping assembly. The scraping assembly is located above the dispersion assembly. The scraping assembly includes a driving part and a scraping part. The driving part includes a driving motor fixedly installed on the side wall of the outer cylinder. The output end of the driving motor is fixedly connected with a threaded rod. A guide rod is fixedly installed inside the outer cylinder, and the guide rod is parallel to the threaded rod.

[0015] Preferably, the scraping part includes a fixed housing. A threaded block is fixedly installed inside the fixed housing. The threaded block is threadedly connected with the threaded rod. The fixed housing is slidably connected with the guide rod. A plurality of U-shaped scrapers are arranged at the bottom of the fixed housing. The plurality of U-shaped scrapers correspond to the plurality of first dispersion holes.

[0016] Preferably, a second electric telescopic rod is fixedly installed on the inner wall of the fixed housing. The telescopic end of the second electric telescopic rod is fixedly connected with a transmission plate. The transmission plate is located inside the fixed housing and is slidably connected with the fixed housing. The tops of the plurality of U-shaped scrapers are fixedly connected with the bottom of the transmission plate.

[0017] An exhaust gas purification method for carbon dioxide recovery includes the above-mentioned exhaust gas purification equipment for carbon dioxide recovery, and further includes the following steps:

[0018] S1. Spraying: Spray lime water into the inner part of the outer cylinder through a communicating pipe and a nozzle. The lime water accumulates at the bottom inside the outer cylinder. When the liquid level is higher than the upper end of the first dispersion plate, exhaust gas is introduced into the outer cylinder through an air inlet pipe.

[0019] S2. Purifying: The exhaust gas entering the outer cylinder reacts with the lime water to generate calcium sulfite and calcium sulfate precipitates. Sulfur dioxide in the exhaust gas is removed. The gas after reacting with the lime water flows towards the nozzle through the grid holes formed by the first dispersion holes and the second dispersion holes. The lime water sprayed by the nozzle further purifies the gas.

[0020] S3. Stirring: The slag removal motor drives the rotating plate, the rotating shaft, the first stirring plate and the second stirring plate to rotate, stir the lime water inside the outer cylinder, and stir the exhaust gas bubbles entering the inner part of the outer cylinder.

[0021] S4. Adjustment: After purification for a period of time, the first electric telescopic rod drives the first dispersion plate to move upward. The first dispersion plate drives the second dispersion plate to rotate and move upward through the rotating ring. The four embedding rods installed on the side wall of the second dispersion plate slide along the four arc-shaped guide grooves respectively during the upward movement of the second dispersion plate. The second dispersion plate rotates by °, and multiple second dispersion holes coincide with multiple first dispersion holes. Both the first dispersion plate and the second dispersion plate are separated from the lime water liquid level. The U-shaped scraper is embedded in the first dispersion holes. The first electric telescopic rod drives the first dispersion plate and the second dispersion plate to continue moving upward, and the U-shaped scraper is embedded in the second dispersion holes.

[0022] S5. Scraping: The driving part drives the fixed housing to move. Multiple U-shaped scrapers move along the inner walls of the first dispersion holes and the second dispersion holes to scrape the precipitates adhering to the inner walls of the dispersion holes. The second electric telescopic rod simultaneously drives the transmission plate to move horizontally back and forth, and multiple U-shaped scrapers scrape back and forth following the transmission plate. The lime water sprayed by the nozzle flushes the precipitates scraped by the U-shaped scraper into the accumulated lime water.

[0023] S6. Slag removal: The upward movement of the second dispersion plate pulls the rotating shaft upward, and the first stirring plate is pulled out of the second stirring plate by the rotating shaft. The third electric telescopic rod pushes the sector plate to drive the second installation frame to slide upward along the side wall of the first installation frame. After the trapezoidal sliding block slides to the upper end of the second sliding groove, the second installation frame pulls the first installation frame upward. The second stirring plate and the second installation frame are on the same side of the sector-shaped housing. Both the upper end of the first stirring plate and the first installation frame extend out of the lime water liquid level. Start the slag removal motor, and the first stirring plate and the second stirring plate rotate to the other side of the sector-shaped housing to push the precipitates into the sector-shaped housing. After the sector plate moves down to close the sector-shaped housing, the water outlet part discharges the slag.

[0024] Compared with the existing technology, the advantages of the present invention are as follows:

[0025] By installing devices such as a sector-shaped housing, a sieve mesh, and a sector plate, the present invention rotates the first stirring plate and the second stirring plate from one side of the sector-shaped housing to the other side through the rotating shaft, so that the precipitates are pushed into the sector-shaped housing. After the sector plate is closed, the precipitates are discharged. During the waste gas purification process, the precipitates in the lime water are continuously removed, avoiding the floating precipitates from blocking the first dispersion holes and the second dispersion holes, which affects the waste gas circulation efficiency. At the same time, it avoids the negative impact of precipitate accumulation on the sulfur dioxide removal efficiency, and helps to maintain the liquid level stability inside the outer cylinder, avoiding the liquid level from being too high. This not only reduces the potential overflow risk, but also ensures the effective contact and reaction between the waste gas and the lime water, effectively purifies the sulfur dioxide in the waste gas, reduces its corrosion to the subsequent carbon dioxide recovery equipment, and improves the reliability and safety of the entire waste gas treatment system.

[0026] In the present invention, by installing devices such as spray nozzles, outer cylinders, and intake pipes, the exhaust gas enters the outer cylinder and undergoes a preliminary reaction with the accumulated lime water, removing most of the sulfur dioxide. The exhaust gas then continues to rise and comes into contact again with the fresh lime water sprayed by the spray nozzles, undergoing a secondary reaction. This continuous reaction process increases the contact opportunity between sulfur dioxide and lime water, thereby improving the reaction efficiency. Since the exhaust gas and lime water have undergone a sufficient reaction, sulfur dioxide has been more effectively absorbed and converted, thus enhancing the purification effect of the exhaust gas, significantly reducing the sulfur dioxide content in the exhaust gas, and thereby reducing the risk of equipment corrosion.

[0027] In the present invention, by installing devices such as a first dispersion plate and a second dispersion plate, the strip-shaped first dispersion holes and second dispersion holes are vertically formed into a grid-like pattern of holes. When the bubbles of the exhaust gas pass through the grid-like holes, they are divided into more small bubbles, effectively increasing the contact area between the exhaust gas and lime water. At the same time, the exhaust gas is evenly dispersed in all directions during the rising process, avoiding the concentration of gas in certain areas, and contributing to the effective mixing and reaction of the exhaust gas and lime water throughout the reaction area, thereby enhancing the purification effect of the equipment.

[0028] In the present invention, by installing devices such as U-shaped scrapers, fixed shells, and drive plates, multiple groups of U-shaped scrapers scrape inside the first dispersion holes and second dispersion holes to remove the precipitates adhering to the inner walls of the dispersion holes. During the movement of the fixed shell, the second electric telescopic rod drives the drive plate to move horizontally, causing the U-shaped scrapers to perform reciprocating motions along the inner wall of the fixed shell, promoting the scraping of the precipitates adhering to the inner walls of the dispersion holes by the U-shaped scrapers, preventing the dispersion holes from being blocked due to the accumulation of precipitates, ensuring the smooth flow of the exhaust gas, improving the efficiency and effect of exhaust gas treatment, and the lime water sprayed by the spray nozzles flushes the precipitates scraped by the U-shaped scrapers into the accumulated lime water, thereby enhancing the cleaning effect of the dispersion holes.

[0029] In the present invention, by installing devices such as a first stirring plate and a second stirring plate, after the slag removal motor is started, the rotating shaft drives the first stirring plate and the second stirring plate to rotate, stirring the lime water accumulated inside the outer cylinder, enabling calcium hydroxide in the lime water to come into more sufficient contact and mixing with sulfur dioxide in the exhaust gas, increasing the reaction area between the two, thereby improving the rate of the chemical reaction. Stirring enables sulfur dioxide in the exhaust gas to react more comprehensively with the lime water, and thus be more thoroughly absorbed and converted, reducing the emission concentration of sulfur dioxide in the exhaust gas, improving the purification effect of the exhaust gas, and also helping to accelerate the mixing speed of other pollutants (such as dust, etc.) in the exhaust gas with the lime water, achieving the synergistic purification of multiple components. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of an exhaust gas purification device and its purification method for carbon dioxide recovery proposed by the present invention.

[0031] Figure 2 The overall structural sectional view of an exhaust gas purification device and its purification method for carbon dioxide recovery proposed by the present invention.

[0032] Figure 3 The sectional view of the housing assembly and the intake pipe structure of an exhaust gas purification device and its purification method for carbon dioxide recovery proposed by the present invention.

[0033] Figure 4 The schematic diagram of the scraping component and the dispersion component structure of an exhaust gas purification device and its purification method for carbon dioxide recovery proposed by the present invention.

[0034] Figure 5 The schematic diagram of the scraping component structure of an exhaust gas purification device and its purification method for carbon dioxide recovery proposed by the present invention.

[0035] Figure 6 The schematic diagram of the dispersion component structure of an exhaust gas purification device and its purification method for carbon dioxide recovery proposed by the present invention.

[0036] Figure 7 For an exhaust gas purification device and its purification method for carbon dioxide recovery proposed by the present invention Figure 6 The enlarged detail view of part A.

[0037] Figure 8 The schematic diagram of the slag removal component structure of an exhaust gas purification device and its purification method for carbon dioxide recovery proposed by the present invention.

[0038] Figure 9 The schematic diagram of the split structure of the rotating component of an exhaust gas purification device and its purification method for carbon dioxide recovery proposed by the present invention.

[0039] Figure 10 The schematic diagram of the split structure of the collection component of an exhaust gas purification device and its purification method for carbon dioxide recovery proposed by the present invention.

[0040] Figure 11 For an exhaust gas purification device and its purification method for carbon dioxide recovery proposed by the present invention Figure 10 The enlarged detail view of part B.

[0041] In the figure: 1 housing assembly, 11 outer cylinder, 12 air outlet pipe, 13 support column, 14 arc-shaped guide groove, 15 first sliding groove, 2 scraping assembly, 21 driving part, 22 scraping member, 221 fixed housing, 222 threaded block, 223 second electric telescopic rod, 224 transmission plate, 225 U-shaped scraper, 3 slag removal assembly, 31 fixed cylinder, 32 rotating member, 321 slag removal motor, 322 rotating plate, 323 rotating shaft, 324 fixed disk, 325 first stirring plate, 326 second stirring plate, 33 collecting member, 331 third electric telescopic rod, 332 sector plate, 333 first mounting frame, 334 second mounting frame, 335 trapezoidal sliding bar, 336 trapezoidal sliding block, 337 second sliding groove, 338 sieve, 34 sector-shaped housing, 35 water outlet part, 4 air inlet pipe, 5 spraying assembly, 51 connecting pipe, 52 nozzle, 6 dispersing assembly, 61 first electric telescopic rod, 62 first dispersing disk, 621 first dispersing hole, 63 second dispersing disk, 631 second dispersing hole, 64 embedding rod, 65 rotating ring. Detailed implementation manner

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0043] Refer to Figures 1 to 11, An exhaust gas purification device for carbon dioxide recovery, including a housing assembly 1. The housing assembly 1 includes an outer cylinder 11. The top of the outer cylinder 11 is fixedly communicated with an air outlet pipe 12. The bottom of the outer cylinder 11 is fixedly installed with support columns 13. The side wall of the outer cylinder 11 is fixedly communicated with an air inlet pipe 4. A spraying assembly 5 is arranged inside the outer cylinder 11. The spraying assembly 5 includes a communicating pipe 51 fixedly communicated with the side wall of the outer cylinder 11. The end of the communicating pipe 51 is fixedly communicated with a spray head 52. The spray head 52 is located inside the outer cylinder 11 and is used for spraying lime water. Sulfur dioxide gas in the exhaust gas is a gas with reducibility and weak oxidizing property, and at the same time is an acidic oxide, which can react with alkali to form corresponding salts and water. The main component of lime water is calcium hydroxide. Sulfur dioxide reacts with calcium hydroxide in aqueous solution to form calcium sulfite and water. The formed calcium sulfite is slightly soluble, so it will exist in the form of precipitation in the solution. Calcium sulfite is further oxidized to calcium sulfate. Calcium sulfate is insoluble and will also exist in the form of precipitation in the solution. A dispersion assembly 6 is arranged inside the outer cylinder 11. The dispersion assembly 6 includes a first dispersion plate 62 and a second dispersion plate 63. The first dispersion plate 62 is located above the second dispersion plate 63. A plurality of strip-shaped first dispersion holes 621 are formed through the top of the first dispersion plate 62. A plurality of strip-shaped second dispersion holes 631 are formed through the top of the second dispersion plate 63. And the first dispersion holes 621 and the second dispersion holes 631 are perpendicular to form a grid-like hole. The shapes and sizes of the first dispersion holes 621 and the second dispersion holes 631 are the same. The spray head 52 is located above the first dispersion plate 62. The pipe orifice of the air inlet pipe 4 is located below the second dispersion plate 63. The exhaust gas enters the outer cylinder 11 from the air inlet pipe 4 and reacts with the lime water at the bottom of the inner wall of the outer cylinder 11. It sequentially passes through the second dispersion holes 631 and the first dispersion holes 621 from bottom to top, and finally reacts with the lime water sprayed by the spray head 52 and is discharged from the air outlet pipe 12. The exhaust gas reacts with the accumulated lime water for a preliminary reaction, removing most of the sulfur dioxide. The exhaust gas continues to rise and contacts the fresh lime water sprayed by the spray head 52 again for a secondary reaction. This continuous reaction process significantly increases the contact opportunity between sulfur dioxide and lime water, thereby improving the reaction efficiency, enabling the exhaust gas to react fully with the lime water, and making the sulfur dioxide more effectively absorbed and converted, thus enhancing the purification effect of the exhaust gas. The grid-like holes formed by the perpendicularity of the first dispersion holes 621 and the second dispersion holes 631 enable the exhaust gas to be evenly dispersed in all directions during the rising process, avoiding the concentration of gas in certain areas, and contributing to the effective mixing and reaction of the exhaust gas and lime water in the entire reaction area. When the exhaust gas passes through the grid-like holes, a turbulence effect will be generated. Turbulence can further promote the mass transfer and heat transfer between the exhaust gas and lime water, making the reaction more complete and rapid. In addition, the grid-like hole design is less likely to be blocked compared to holes of other shapes (such as circular holes).

[0044] A first electric telescopic rod 61 is fixedly installed on the inner wall of the outer cylinder 11. The bottom of the first electric telescopic rod 61 is fixedly connected to the top of the first dispersion disc 62. Four arc-shaped guide grooves 14 are formed in the inner wall of the outer cylinder 11. Four embedding rods 64 are fixedly installed on the side wall of the second dispersion disc 63. The four embedding rods 64 are circumferentially arrayed on the side wall of the second dispersion disc 63. The four embedding rods 64 are respectively slidably connected to the four arc-shaped guide grooves 14. The bottom of the first dispersion disc 62 is rotationally connected to the second dispersion disc 63 through a rotating ring 65. The cross-section of the rotating ring 65 is trapezoidal to prevent the second dispersion disc 63 from separating from the first dispersion disc 62. The first electric telescopic rod 61 pulls the first dispersion disc 62 upward. The second dispersion disc 63 rotates upward under the action of the rotating ring 65. The four embedding rods 64 installed on the side wall of the second dispersion disc 63 slide along the corresponding arc-shaped guide grooves 14. The second dispersion disc 63 rotates 90° under the action of the embedding rods 64 and the arc-shaped guide grooves 14, so that the first dispersion holes 621 and the second dispersion holes 631 coincide. At this time, the first dispersion disc 62 and the second dispersion disc 63 are separated from the lime water liquid level.

[0045] Inside the outer cylinder 11, a scraping component 2 is provided. The scraping component 2 includes a driving part 21 and a scraping member 22. The driving part 21 includes a threaded rod, a driving motor, and a guide rod. The driving motor is fixedly installed on the outer wall of the outer cylinder 11. The threaded rod is fixedly connected to the output shaft of the motor. The guide rod is fixedly installed on the inner wall of the outer cylinder 11 and is parallel to the threaded rod. The scraping member 22 includes a fixed housing 221. Inside the fixed housing 221, a threaded block 222 is fixedly installed. The threaded block 222 is threadedly connected to the threaded rod, and the fixed housing 221 is slidably connected to the guide rod. Inside the inner wall of the fixed housing 221, a second electric telescopic rod 223 is fixedly installed. The telescopic end of the second electric telescopic rod 223 is fixedly connected to a transmission plate 224. The transmission plate 224 is slidably connected to the inner wall of the fixed housing 221. At the bottom of the transmission plate 224, a plurality of U-shaped scrapers 225 are fixedly installed. The plurality of U-shaped scrapers 225 are located outside the fixed housing 221 and correspond to a plurality of first dispersion holes 621. After the first dispersion holes 621 and the second dispersion holes 631 coincide, the first electric telescopic rod 61 pulls the first dispersion disk 62 and the second dispersion disk 63 to move upward again. The end of the arc-shaped guide groove 14 is vertically upward. When the embedding rod 64 initially slides along the arc-shaped guide groove 14, it drives the second dispersion disk 63 to make an angle adjustment. When sliding along the arc-shaped guide groove 14 again, it only moves vertically upward, so that the U-shaped scrapers 225 can be embedded into the first dispersion holes 621 and the second dispersion holes 631. The fixed housing 221 makes a reciprocating motion under the action of the driving part 21. The plurality of U-shaped scrapers 225 move synchronously with the fixed housing 221 to scrape the sediment adhered to the inner walls of the first dispersion holes 621 and the second dispersion holes 631, which can comprehensively and deeply remove the sediment adhered to the inner walls of the dispersion holes, ensuring the thoroughness of cleaning, effectively preventing the blockage problem caused by the accumulation of sediment. At the same time, the second electric telescopic rod 223 is started, so that the transmission plate 224 makes a reciprocating motion on the inner wall of the fixed housing 221. The U-shaped scrapers 225 move synchronously with the transmission plate 224, so that the U-shaped scrapers 225 move back and forth while moving along the inner walls of the first dispersion holes 621 and the second dispersion holes 631, further enhancing the cleaning effect, ensuring the unobstructedness of the dispersion holes, and improving the efficiency and effect of waste gas treatment. The lime water sprayed by the spray head 52 flushes the scraped sediment into the accumulated lime water at the lower end inside the outer cylinder 11, thereby enhancing the cleaning effect of the dispersion holes.

[0046] Inside the outer cylinder 11, a slag removal component 3 is provided. The slag removal component 3 includes a fixed cylinder 31 and a rotating member 32. The fixed cylinder 31 is fixedly installed at the center of the bottom of the outer cylinder 11. The rotating member 32 includes a slag removal motor 321. The slag removal motor 321 is fixedly installed at the bottom of the fixed cylinder 31. The output end of the slag removal motor 321 is fixedly connected to a rotating plate 322. A rotating shaft 323 is sleeved on the outer wall of the rotating plate 322. The rotating shaft 323 is slidably connected to the rotating plate 322. The rotating shaft 323 is located inside the fixed cylinder 31. The top of the rotating shaft 323 is rotatably connected to a fixed disk 324. The top of the fixed disk 324 is fixedly connected to the bottom of the second dispersion disk 63. When the second dispersion disk 63 moves upward, the rotating shaft 323 is pulled upward through the fixed disk 324, so that the rotating shaft 323 extends out of the fixed cylinder 31. A first stirring plate 325 is fixedly installed on the side wall of the rotating shaft 323. A first sliding groove 15 is opened at the bottom of the inner wall of the outer cylinder 11. A second stirring plate 326 is provided inside the outer cylinder 11. A trapezoidal slider is fixedly installed at the bottom of the second stirring plate 326. The trapezoidal slider is slidably connected to the first sliding groove 15. The second stirring plate 326 is located below the first stirring plate 325. A storage groove for receiving the first stirring plate 325 is opened at the top of the second stirring plate 326. And the first stirring plate 325 is slidably connected to the storage groove. When the rotating shaft 323 extends upward from inside the fixed cylinder 31, the first stirring plate 325 is driven to extend out of the second stirring plate 326. When the slag removal motor 321 is started, the first stirring plate 325 and the second stirring plate 326 are driven to rotate through the rotating plate 322 and the rotating shaft 323. The second stirring plate 326 moves along the first sliding groove 15 under the action of the trapezoidal slider, stirring the lime water in the outer cylinder 11. The first sliding groove 15 is not a complete circle. The second stirring plate 326 continuously rotates in the clockwise and counterclockwise directions alternately, continuously stirring the lime water, so that calcium hydroxide in the lime water contacts and mixes more fully with sulfur dioxide in the waste gas, increasing the reaction area between the two, thereby improving the rate of the chemical reaction. Through stirring, sulfur dioxide in the waste gas can react more comprehensively with the lime water, and thus be absorbed and converted more thoroughly, helping to reduce the emission concentration of sulfur dioxide in the waste gas and improve the purification effect of the waste gas. Stirring also helps to mix other pollutants (such as dust, etc.) in the waste gas with the lime water to achieve the synergistic purification of multiple components.

[0047] A sector-shaped housing 34 is fixedly installed at the bottom of the outer cylinder 11. An outlet part 35 is arranged at the bottom of the sector-shaped housing 34. The two sides of the sector-shaped housing 34 correspond to the first sliding grooves 15. A collecting component 33 is arranged inside the sector-shaped housing 34. The collecting component 33 includes a third electric telescopic rod 331 fixedly installed at the bottom of the inner wall of the sector-shaped housing 34. The top of the third electric telescopic rod 331 is fixedly connected to a sector-shaped plate 332. The sector-shaped plate 332 is used to close the sector-shaped housing 34. A first mounting frame 333 and a second mounting frame 334 are arranged at the bottom of the sector-shaped plate 332. The top of the second mounting frame 334 is fixedly connected to the bottom of the sector-shaped plate 332. A trapezoidal sliding strip 335 is fixedly installed on the side wall of the second mounting frame 334. The trapezoidal sliding strip 335 is slidably connected to the first mounting frame 333. A vertical second sliding groove 337 is arranged on the side wall of the first mounting frame 333. A trapezoidal sliding block 336 is fixedly installed on the side of the second mounting frame 334 close to the first mounting frame 333. The trapezoidal sliding block 336 is slidably connected to the second sliding groove 337. Sieve meshes 338 are respectively arranged on the side walls of the first mounting frame 333 and the second mounting frame 334. When the second dispersion disc 63 moves upward, the rotating shaft 323 drives the first stirring plate 325 to move upward simultaneously. The third electric telescopic rod 331 pushes the sector-shaped plate 332 to move upward to open the sector-shaped housing 34. The sector-shaped plate 332 drives the second mounting frame 334 to slide upward along the side wall of the first mounting frame 333. Until the trapezoidal sliding block 336 slides to the upper end of the second sliding groove 337, the second mounting frame 334 pulls the first mounting frame 333 to move upward together. The second mounting frame 334 is flush with the side of the sector-shaped plate 332. Before the U-shaped scraper 225 scrapes the precipitates on the inner walls of the first dispersion holes 621 and the second dispersion holes 631, the second stirring plate 326 moves to the end of the first sliding groove 15 and fits with the second mounting frame 334. The upper ends of the first stirring plate 325 and the first mounting frame 333 both extend out of the liquid level of the lime water. The slag removal motor 321 is started to make the first stirring plate 325 and the second stirring plate 326 rotate to the other side of the sector-shaped housing 34. The lime water passes through the sieve meshes 338 on the first mounting frame 333 and the second mounting frame 334. The precipitates are intercepted by the sieve meshes 338 and remain between the first stirring plate 325, the second stirring plate 326, the first mounting frame 333 and the second mounting frame 334. After the U-shaped scraper 225 finishes scraping, the second dispersion disc 63 moves downward to reset. The third electric telescopic rod 331 retracts. The sector-shaped plate 332 moves downward to close the sector-shaped housing 34. The precipitates enter the sector-shaped housing 34. The water liquid and the precipitates inside the sector-shaped housing 34 are discharged through the outlet part 35. During the waste gas purification process, the precipitates in the lime water are continuously removed, avoiding the negative impact of the accumulation of precipitates on the sulfur dioxide removal efficiency. Regularly discharging part of the solution and the precipitates helps to maintain the liquid level stability inside the outer cylinder 11, avoiding the potential overflow risk caused by too high a liquid level and ensuring the effective contact and reaction between the waste gas and the lime water, effectively purifying the sulfur dioxide in the waste gas.Reduce its corrosion to subsequent carbon dioxide recovery equipment, extend the service life of the equipment, reduce the maintenance cost, and improve the reliability and safety of the entire waste gas treatment system. The reduction of particulate impurities in the purified waste gas means that the impurity content in the recovered carbon dioxide is also correspondingly reduced, improving the recovery quality of carbon dioxide and making it more suitable for subsequent applications and storage. The lime water sprayed by the nozzle 52 is not only used to react with the waste gas, but also used to reduce the dust of the precipitated dust with finer particle size, realizing the effective utilization of resources and reducing the discharge of waste water and waste gas.

[0048] An exhaust gas purification method for carbon dioxide recovery, applying the above-mentioned exhaust gas purification equipment for carbon dioxide recovery, mainly includes the following steps:

[0049] S1. Spraying: Spray the lime water into the interior of the outer cylinder 11 through the connecting pipe 51 and the nozzle 52. The lime water accumulates at the bottom inside the outer cylinder 11. When the liquid level is higher than the upper end of the first dispersion plate 62, introduce the waste gas into the outer cylinder 11 through the air inlet pipe 4.

[0050] S2. Purifying: The waste gas entering the outer cylinder 11 reacts with the lime water to generate calcium sulfite and calcium sulfate precipitates, and the sulfur dioxide in the waste gas is removed. The gas after reacting with the lime water flows towards the nozzle 52 through the grid holes formed by the first dispersion holes 621 and the second dispersion holes 631. The lime water sprayed by the nozzle 52 further purifies the gas.

[0051] S3. Stirring: The slag removal motor 321 drives the rotating plate 322, the rotating shaft 323, the first stirring plate 325 and the second stirring plate 326 to rotate, stir the lime water inside the outer cylinder 11, and agitate the waste gas bubbles entering the interior of the outer cylinder 11.

[0052] S4. Adjusting: After purifying for a period of time, the first electric telescopic rod 61 drives the first dispersion plate 62 to move upward. The first dispersion plate 62 drives the second dispersion plate 63 to rotate and move upward through the rotating ring 65. The four embedding rods 64 installed on the side wall of the second dispersion plate 63 slide along the four arc-shaped guide grooves 14 respectively during the upward movement of the second dispersion plate 63. The second dispersion plate 63 rotates 90°. A plurality of second dispersion holes 631 and a plurality of first dispersion holes 621 coincide. Both the first dispersion plate 62 and the second dispersion plate 63 are separated from the lime water liquid level. The U-shaped scraper 225 is embedded in the first dispersion holes 621. The first electric telescopic rod 61 drives the first dispersion plate 62 and the second dispersion plate 63 to continue moving upward, and the U-shaped scraper 225 is embedded in the second dispersion holes 631.

[0053] S5. Scraping: The driving part 21 drives the fixed housing 221 to move, and multiple U-shaped scrapers 225 move along the inner walls of the first dispersion holes 621 and the second dispersion holes 631 to scrape the sediment adhering to the inner walls of the dispersion holes. Meanwhile, the second electric telescopic rod 223 drives the transmission plate 224 to reciprocate horizontally, and multiple U-shaped scrapers 225 scrape back and forth following the transmission plate 224. The lime water sprayed by the nozzle 52 flushes the sediment scraped by the U-shaped scrapers 225 into the accumulated lime water.

[0054] S6. Slag removal: The second dispersion plate 63 moves upward to pull the rotating shaft 323 upward, and the first stirring plate 325 is pulled out of the second stirring plate 326 by the rotating shaft 323. The third electric telescopic rod 331 pushes the sector plate 332 to drive the second mounting frame 334 to slide upward along the side wall of the first mounting frame 333. After the trapezoidal sliding block 336 slides to the upper end of the second sliding groove 337, the second mounting frame 334 pulls the first mounting frame 333 upward. The second stirring plate 326 and the second mounting frame 334 are on the same side of the sector housing 34. The upper ends of the first stirring plate 325 and the first mounting frame 333 both extend out of the liquid level of the lime water. The slag removal motor 321 is started, and the first stirring plate 325 and the second stirring plate 326 rotate to the other side of the sector housing 34 to push the sediment into the sector housing 34. After the sector plate 332 moves downward to close the sector housing 34, the water outlet part 35 discharges the slag.

[0055] In the present invention, during use, first, the lime water is sprayed into the inner part of the outer cylinder 11 through the connecting pipe 51 and the nozzle 52. The lime water accumulates at the lower end inside the outer cylinder 11 for a period of time, so that the liquid level of the lime water inside the outer cylinder 11 is higher than the upper end of the first dispersion plate 62. Exhaust gas is introduced into the inner part of the outer cylinder 11 through the air inlet pipe 4. Since the height of the air outlet end of the air inlet pipe 4 is lower than the height of the second dispersion plate 63, the exhaust gas discharged through the air inlet pipe 4 will form bubbles in the lime water. Sulfur dioxide in the exhaust gas in contact with the lime water will react with the lime water to generate calcium sulfite and calcium sulfate precipitates, thereby being able to remove sulfur dioxide in the exhaust gas. Since the first dispersion holes 621 and the second dispersion holes 631 are vertically arranged at this time, a relatively small gap is formed at the overlapping position of the first dispersion holes 621 and the second dispersion holes 631. When the bubbles of the exhaust gas pass through the gap, they will be divided into more small bubbles, which can effectively increase the contact area between the exhaust gas and the lime water. As the bubbles of the exhaust gas continue to rise, the bubbles will move upward above the liquid level of the lime water, and the exhaust gas will contact the lime water sprayed by the nozzle 52, which can further remove the residual sulfur dioxide gas in the exhaust gas and improve the efficiency of removing sulfur dioxide in the exhaust gas.

[0056] After the device has been used for a period of time, the first electric telescopic rod 61 is used to move the first dispersion disc 62 upward. Since the second dispersion disc 63 is rotatably connected to the lower end of the first dispersion disc 62 through the rotating ring 65, and the cross-section of the rotating ring 65 is trapezoidal, the separation of the second dispersion disc 63 from the first dispersion disc 62 can be avoided. When the first dispersion disc 62 moves upward, it can drive the second dispersion disc 63 to move upward as well. At the same time, since the four embedding rods 64 are respectively embedded and slidably connected to the four arc-shaped guide grooves 14, when the second dispersion disc 63 moves upward, the four arc-shaped guide grooves 14 can respectively guide the four rotating rings 65, causing the second dispersion disc 63 to rotate 90°, so that the second dispersion holes 631 and the first dispersion holes 621 can coincide. At this time, the U-shaped scraper 225 is embedded inside the first dispersion holes 621, and both the first dispersion disc 62 and the second dispersion disc 63 are separated from the lime water surface. Subsequently, the first electric telescopic rod 61 is used to continue moving the first dispersion disc 62 upward, so that the U-shaped scraper 225 can penetrate the first dispersion holes 621 and the second dispersion holes 631. Since the threaded block 222 is fixedly arranged inside the fixed housing 221, the driving part 21 can drive the fixed housing 221 to move along the length direction of the first dispersion holes 621, so that multiple U-shaped scrapers 225 can respectively scrape inside the first dispersion holes 621 and the second dispersion holes 631, and the precipitates adhered to the inner walls of the first dispersion holes 621 and the second dispersion holes 631 can be scraped off. At the same time, during the movement of the fixed housing 221, the multiple second electric telescopic rods 223 can drive the transmission plate 224 to move horizontally back and forth, so that the U-shaped scraper 225 can scrape back and forth on the inner walls of the first dispersion holes 621 and the second dispersion holes 631, which can promote the scraping of the precipitates adhered to the inner walls of the first dispersion holes 621 and the second dispersion holes 631, and avoid the blockage of the first dispersion holes 621 and the second dispersion holes 631 by the generated precipitates, resulting in the unsmooth flow of waste gas. The lime water sprayed by the nozzle 52 can wash the precipitates scraped off by the U-shaped scraper 225 into the lime water accumulated at the lower end inside the outer cylinder 11. By collecting the lime water sprayed by the nozzle 52 and reusing it, the resource utilization rate can be improved and the waste of lime water can be reduced.

[0057] During the process of waste gas continuously entering the lime water accumulated inside the outer cylinder 11 through the intake pipe 4, since the rotating shaft 323 is fixedly connected to the first stirring plate 325, the second stirring plate 326 is arranged in contact with the outer surface of the rotating shaft 323, and the first stirring plate 325 is movably embedded at the upper end of the second stirring plate 326, the slag removal motor 321 can drive the rotating plate 322, the rotating shaft 323, the first stirring plate 325 and the second stirring plate 326 to rotate, thereby being able to stir the waste gas bubbles entering the inside of the outer cylinder 11, promoting the dispersion of the bubbles and the contact reaction between the waste gas and the limestone, and thus being able to improve the removal efficiency of sulfur dioxide. Since the rotating shaft 323 is engaged and rotatably connected to the fixed disk 324, and the upper end of the fixed disk 324 is fixedly connected to the lower end of the second dispersion disk 63, the lower end of the second stirring plate 326 is slidably connected to the first sliding groove 15 through a trapezoidal slider, and both ends of the first sliding groove 15 are flush with both sides of the sector plate 332. When the second dispersion disk 63 moves upward, it can pull the rotating shaft 323 to move upward as well, so that the first stirring plate 325 is pulled out from the inside of the second stirring plate 326. The third electric telescopic rod 331 can push the sector plate 332 upward, thereby causing the second mounting frame 334 to slide upward on one side of the first mounting frame 333. Until the trapezoidal sliding block 336 slides to the upper end of the second sliding groove 337, the second mounting frame 334 will pull the first mounting frame 333 to move upward together. The second mounting frame 334 is flush with the side of the sector plate 332. Before the U-shaped scraper 225 scrapes the precipitates on the inner walls of the first dispersion holes 621 and the second dispersion holes 631, the second stirring plate 326 is moved to one end of the first sliding groove 15 close to the second mounting frame 334. During the scraping process of the U-shaped scraper 225, the upper end of the first stirring plate 325 will extend out of the liquid level of the lime water, and the third electric telescopic rod 331 causes the first mounting frame 333 and the second mounting frame 334 to move upward, so that the second mounting frame 334 fits with the second stirring plate 326. At this time, the upper end of the first mounting frame 333 also extends out of the liquid level of the lime water. Subsequently, the slag removal motor 321 causes the first stirring plate 325 and the second stirring plate 326 to rotate, which can stir the lime water to pass through the sieve 338, so that the precipitates remain between the first stirring plate 325, the second stirring plate 326, the first mounting frame 333 and the second mounting frame 334. When the scraping of the U-shaped scraper 225 is completed, the second dispersion disk 63 moves downward to reset, and at the same time, the third electric telescopic rod 331 causes the sector plate 332 to move downward as well, which can scrape the precipitates into the sector-shaped housing 34. After the sector plate 332 contacts the inner wall of the lower end of the outer cylinder 11, it can seal the top of the sector-shaped housing 34 of the outer cylinder 11 again. At this time, through the water outlet part 35, the water liquid and the precipitates inside the sector-shaped housing 34 can be discharged, which can remove the precipitates in the lime water without stopping the gas purification process, avoid the adverse effects of excessive precipitates on the reaction between sulfur dioxide and lime water, and at the same time avoid the floating precipitates from blocking the first dispersion holes 621 and the second dispersion holes 631. By regularly discharging the precipitates,It can discharge part of the solution inside the outer cylinder 11 while discharging the precipitate, which can prevent the liquid level inside the outer cylinder 11 from being too high. The limestone sprayed by the spray head 52 can also suppress the dust of the finer precipitated dust, reduce the precipitate discharged with the purified waste gas, and effectively reduce the particulate impurities inside during carbon dioxide recovery. By purifying sulfur dioxide in the waste gas, sulfur dioxide corrosion of the carbon dioxide recovery equipment can be avoided, thereby reducing the impurity content of the recovered carbon dioxide.

[0058] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A waste gas purification device for carbon dioxide recovery, comprising a housing assembly (1), the housing assembly (1) comprising an outer cylinder (11), the top of the outer cylinder (11) being fixedly connected to an air outlet pipe (12), the bottom of the outer cylinder (11) being fixedly mounted with a support column (13), and the side wall of the outer cylinder (11) being fixedly connected to an air inlet pipe (4), characterized in that: Also includes: A slag removal component (3), the slag removal component (3) comprising a fixed cylinder (31) and a rotating component (32), the fixed cylinder (31) being fixedly mounted on the bottom of the outer cylinder (11), the rotating component (32) comprising a slag removal motor (321), a first stirring plate (325) and a second stirring plate (326), the slag removal motor (321) being fixedly mounted on the bottom of the fixed cylinder (31), the output shaft of the slag removal motor (321) being fixedly connected to the rotating plate (322), the outer wall of the rotating plate (322) being slidably connected to a rotating shaft (323), the fixed cylinder (31) being used to receive the rotating shaft (323), the first stirring plate (325) being fixedly mounted on the side wall of the rotating shaft (323), the top of the second stirring plate (326) being provided with a receiving groove for receiving the first stirring plate (325), and the first stirring plate (325) being slidably connected to the receiving groove; A fan-shaped shell (34) is fixedly mounted on the bottom of the outer cylinder (11), a water outlet (35) is provided on the bottom of the fan-shaped shell (34), a collecting component (33) is provided inside the fan-shaped shell (34), the collecting component (33) comprises a third electric telescopic rod (331) fixedly mounted on the bottom of the inner wall of the fan-shaped shell (34), a fan-shaped plate (332) for closing the fan-shaped shell (34) is fixedly connected to the top of the third electric telescopic rod (331), a second installation frame (334) is fixedly connected to the bottom of the fan-shaped shell (34), a first installation frame (333) is provided on the side wall of the second installation frame (334), and screens (338) are provided on the side walls of the first installation frame (333) and the second installation frame (334); The device also comprises a dispersion assembly (6), wherein the dispersion assembly (6) comprises a first dispersion disc (62) and a second dispersion disc (63); a first electric telescopic rod (61) is fixedly mounted on the inner wall of the outer cylinder (11); the first dispersion disc (62) is fixedly mounted on the bottom of the first electric telescopic rod (61); the bottom of the first dispersion disc (62) is rotatably connected to the second dispersion disc (63) via a rotating ring (65); the first dispersion disc (62) is located below the nozzle (52); and the second dispersion disc (63) is located above the pipe opening of the air inlet pipe (4); A fixed disk (324) is fixedly installed at the bottom of the second dispersion disk (63), and the fixed disk (324) is rotatably connected to the top of the rotating shaft (323); a plurality of first strip-shaped dispersion holes (621) are penetrated through the top of the first dispersion disk (62), and a plurality of second strip-shaped dispersion holes (631) are penetrated through the top of the second dispersion disk (63); the first dispersion holes (621) and the second dispersion holes (631) are of the same shape and size, and the plurality of first dispersion holes (621) and the plurality of second dispersion holes (631) are perpendicularly connected to form a grid-like hole; The inner wall of the outer cylinder (11) is provided with four arc-shaped guide grooves (14) for controlling the second dispersion disc (63) to rotate (90) degrees; four embedded rods (64) are fixedly mounted on the side wall of the second dispersion disc (63); the four embedded rods (64) are distributed in a circular array on the side wall of the second dispersion disc (63); the four embedded rods (64) are respectively slidably connected to the four arc-shaped guide grooves (14); The scraping assembly (2) is also included. The scraping assembly (2) is located above the dispersion assembly (6). The scraping assembly (2) includes a driving part (21) and a scraping part (22). The driving part (21) includes a driving motor fixedly mounted on the side wall of the outer cylinder (11). The output end of the driving motor is fixedly connected to a threaded rod. A guide rod is fixedly mounted inside the outer cylinder (11), and the guide rod is parallel to the threaded rod. The scraping component (22) comprises a fixed shell (221), a threaded block (222) is fixedly installed inside the fixed shell (221), the threaded block (222) is threadedly connected to the threaded rod, the fixed shell (221) is slidably connected to the guide rod, and a plurality of U-shaped scrapers (225) are arranged at the bottom of the fixed shell (221), and the plurality of U-shaped scrapers (225) correspond to the plurality of first dispersion holes (621).

2. A waste gas purification device for carbon dioxide recovery according to claim 1, characterized in that: A first sliding groove (15) is provided at the bottom of the inner wall of the outer cylinder (11); a trapezoidal sliding block (336) is fixedly installed at the bottom of the second stirring plate (326), and the trapezoidal sliding block is slidably connected to the first sliding groove (15); a trapezoidal sliding bar (335) is fixedly installed on the side wall of the second mounting frame (334), and the trapezoidal sliding bar (335) is slidably connected to the first mounting frame (333); a second sliding groove (337) is provided on the side wall of the first mounting frame (333); a trapezoidal sliding block (336) is fixedly installed on the side wall of the second mounting frame (334), and the trapezoidal sliding block (336) is slidably connected to the second sliding groove (337).

3. The waste gas purification equipment for carbon dioxide recovery according to claim 1, characterized in that: It also includes a spraying assembly (5), the spraying assembly (5) including a connecting pipe (51) fixedly connected to the side wall of the outer cylinder (11), the end of the connecting pipe (51) is fixedly connected to a spray head (52), and the spray head (52) is located above the second stirring plate (326).

4. The waste gas purification equipment for carbon dioxide recovery according to claim 1, characterized in that: A second electric telescopic rod (223) is fixedly mounted on the inner wall of the fixed shell (221); a telescopic end of the second electric telescopic rod (223) is fixedly connected to a transmission plate (224); the transmission plate (224) is located inside the fixed shell (221) and is slidably connected to the fixed shell (221); and the tops of the plurality of U-shaped scrapers (225) are fixedly connected to the bottom of the transmission plate (224).

5. A method for purifying waste gas for carbon dioxide recovery, characterized in that: The waste gas purification device for carbon dioxide recovery according to claim 4 further comprises the following steps: S1, spraying, spraying lime water into the interior of the outer cylinder (11) through the connecting pipe (51) and the nozzle (52), the lime water accumulates at the bottom of the inner part of the outer cylinder (11), and when the liquid level is higher than the upper end of the first dispersion disk (62), the exhaust gas is introduced into the outer cylinder (11) through the air inlet pipe (4); S2, purification, the waste gas entering the outer cylinder (11) reacts with lime water to generate calcium sulfite and calcium sulfate precipitation, sulfur dioxide in the waste gas is removed, and the gas after the reaction with the lime water flows toward the nozzle (52) through the grid holes formed by the first dispersion hole (621) and the second dispersion hole (631), and the lime water sprayed by the nozzle (52) further purifies the gas; S3, stirring, the slag removal motor (321) drives the rotating plate (322), the rotating shaft (323), the first stirring plate (325) and the second stirring plate (326) to rotate, stirring the lime water in the outer cylinder (11) and stirring the exhaust gas bubbles entering the inner part of the outer cylinder (11); S4, adjustment, after purification for a period of time, the first electric telescopic rod (61) drives the first dispersion disc (62) to move upward, the first dispersion disc (62) drives the second dispersion disc (63) to rotate and move upward through the rotating ring (65), the four embedded rods (64) installed on the side wall of the second dispersion disc (63) slide along the four arc-shaped guide grooves (14) respectively during the upward movement of the second dispersion disc (63), the second dispersion disc (63) rotates (90) degrees, the plurality of second dispersion holes (631) and the plurality of first dispersion holes (621) overlap, the first dispersion disc (62) and the second dispersion disc (63) are both separated from the lime water liquid surface, the U-shaped scraper (225) is embedded in the first dispersion hole (621), the first electric telescopic rod (61) drives the first dispersion disc (62) and the second dispersion disc (63) to move upward, and the U-shaped scraper (225) is embedded in the second dispersion hole (631); S5, scraping, the driving unit (21) drives the fixed housing (221) to move, and the plurality of U-shaped scrapers (225) move along the inner walls of the first dispersion hole (621) and the second dispersion hole (631) to scrape off the sediment adhered to the inner walls of the dispersion holes, and the second electric telescopic rod (223) drives the transmission plate (224) to move horizontally back and forth, and the plurality of U-shaped scrapers (225) follow the transmission plate (224) to scrape back and forth, and the lime water sprayed by the nozzle (52) flushes the sediment scraped off by the U-shaped scrapers (225) into the accumulated lime water; S6, slag removal, the second dispersing disc (63) moves upward to pull the rotating shaft (323) upward, the first stirring plate (325) is pulled out from the inside of the second stirring plate (326) by the rotating shaft (323), the third electric telescopic rod (331) pushes the fan-shaped plate (332) to drive the second mounting frame (334) to slide upward along the side wall of the first mounting frame (333), after the trapezoidal sliding block (336) slides to the upper end of the second sliding groove (337), the second mounting frame (334) pulls the first mounting frame (333) upward The first stirring plate (325) and the second stirring plate (326) are moved upward, the second stirring plate (326) and the second mounting frame (334) are located on the same side of the fan-shaped housing (34), the upper ends of the first stirring plate (325) and the first mounting frame (333) are both extended out of the liquid surface of the lime water, the slag removal motor (321) is started, the first stirring plate (325) and the second stirring plate (326) are rotated to the other side of the fan-shaped housing (34), and the sediment is pushed into the fan-shaped housing (34), and after the fan-shaped plate (332) moves downward to close the fan-shaped housing (34), the water outlet (35) is discharged.

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