Waste gas purification equipment for carbon dioxide recovery and purification method thereof

Abstract

The invention relates to the technical field of carbon dioxide recovery waste gas purification, in particular to waste gas purification equipment for carbon dioxide recovery and a purification method thereof.The waste gas purification equipment for carbon dioxide recovery comprises a shell assembly and further comprises a slag removal assembly, and the slag removal assembly comprises a fixed cylinder and a rotating part; the rotating component comprises a slag removal motor, a first stirring plate and a second stirring plate, a fan-shaped shell is fixedly mounted at the bottom of the outer cylinder, a water outlet part is arranged at the bottom of the fan-shaped shell, and a collecting component is arranged in the fan-shaped shell, and the waste gas purification method for carbon dioxide recovery comprises the steps of spraying, purification and the like. The device has the advantages that sediments in the lime water are continuously removed in the waste gas purification process, the negative influence of sediment accumulation on the sulfur dioxide removal efficiency is avoided, sulfur dioxide in the waste gas is effectively purified, corrosion of the sulfur dioxide to subsequent carbon dioxide recovery equipment is reduced, and the reliability and the safety of a whole waste gas treatment system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas purification for carbon dioxide recovery, and in particular to waste gas purification equipment for carbon dioxide recovery and a purification method thereof. Background Art

[0002] When recovering carbon dioxide from flue gas, the flue gas usually contains more 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 can cause serious corrosion to the recovery equipment, affecting the service life and safety of the equipment. Through effective desulfurization treatment, the sulfur dioxide content in the flue gas can be significantly reduced, reducing the corrosion to the equipment and protecting the integrity and stability of the equipment. In addition, sulfur dioxide in the flue gas will contaminate the recovered carbon dioxide and reduce its purity and quality.

[0003] At present, a traditional waste gas purification equipment for carbon dioxide recovery usually uses lime water to remove sulfur dioxide in the waste gas. The main component of lime water is calcium hydroxide, which will generate precipitation when reacting with sulfur dioxide in the waste gas. As time goes by, the generated precipitation will continue to accumulate at the bottom of the reaction container. The increase in precipitation will occupy the space of the reaction container, which will reduce the volume of the calcium hydroxide solution that can participate in the reaction and reduce the purification efficiency of the waste gas. In addition, the accumulation of precipitation will also affect the distribution and flow of the gas in the reaction container. Directly shutting down the equipment for precipitate removal means that the waste gas cannot be purified during this period, which affects the continuity and stability of the production line, causing unnecessary losses to production, and thus making the equipment less practical. Summary of the invention

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

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A waste gas purification device for carbon dioxide recovery, comprising a housing assembly, the housing assembly comprising an outer cylinder, the top of the outer cylinder is fixedly connected to an air outlet pipe, the bottom of the outer cylinder is fixedly installed with a support column, the side wall of the outer cylinder is fixedly connected to an air inlet pipe, and further comprising: A slag removal component, the slag removal component comprises a fixed cylinder and a rotating component, the fixed cylinder is fixedly mounted on the bottom of the outer cylinder, the rotating component comprises a slag removal motor, a first stirring plate and a second stirring plate, the slag removal motor is fixedly mounted on the bottom of the fixed cylinder, the output shaft of the slag removal motor is fixedly connected to the rotating plate, the outer wall of the rotating plate is slidably connected to the rotating shaft, the fixed cylinder is used to receive the rotating shaft, the first stirring plate is fixedly mounted on the side wall of the rotating shaft, a receiving groove for receiving the first stirring plate is provided on the top of the second stirring plate, and the first stirring plate is slidably connected to the receiving groove; A fan-shaped shell is fixedly installed at the bottom of the outer cylinder, a water outlet is provided at the bottom of the fan-shaped shell, a collecting component is provided inside the fan-shaped shell, the collecting component includes a third electric telescopic rod fixedly installed at the bottom of the inner wall of the fan-shaped shell, a fan-shaped plate for closing the fan-shaped shell is fixedly connected to the top of the third electric telescopic rod, a second installation frame is fixedly connected to the bottom of the fan-shaped plate, a first installation frame is provided on the side wall of the second installation frame, and screens are provided on the side walls of the first installation frame and the second installation frame, respectively.

[0006] Preferably, a first sliding groove is provided at the bottom of the inner wall of the outer cylinder, a trapezoidal sliding block is fixedly installed at the bottom of the second stirring plate, and the trapezoidal sliding block is slidably connected to the first sliding groove, a trapezoidal sliding bar is fixedly installed on the side wall of the second mounting frame, and the trapezoidal sliding bar is slidably connected to the first mounting frame, a second sliding groove is provided 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 to the second sliding groove.

[0007] Preferably, it further comprises a spraying assembly, wherein the spraying assembly comprises a connecting pipe fixedly connected to the side wall of the outer cylinder, the end of the connecting pipe is fixedly connected to a spray head, and the spray head is located above the second stirring plate.

[0008] Preferably, it also includes a dispersion component, which includes a first dispersion disk and a second dispersion disk, and the inner wall of the outer cylinder is fixedly mounted with a first electric telescopic rod, the first dispersion disk is fixedly mounted on the bottom of the first electric telescopic rod, and the bottom of the first dispersion disk is rotatably connected to the second dispersion disk through a rotating ring, the first dispersion disk is located below the nozzle, and the second dispersion disk is located above the pipe opening of the air inlet pipe.

[0009] Preferably, a fixed plate is fixedly installed at the bottom of the second dispersion plate, and the fixed plate is rotatably connected to the top of the rotating shaft. A plurality of first strip-shaped dispersion holes are penetrated through the top of the first dispersion plate, and a plurality of second strip-shaped dispersion holes are penetrated through the top of the second dispersion plate. The first dispersion holes and the second dispersion holes are the same in shape and size, and the plurality of first dispersion holes and the plurality of second dispersion holes are perpendicular to form a grid-like hole.

[0010] Preferably, the inner wall of the outer cylinder is provided with four arc-shaped guide grooves for controlling the second dispersion disk to rotate 90°, and the side wall of the second dispersion disk is fixedly installed with four embedded rods, the four embedded rods are distributed in a circular array on the side wall of the second dispersion disk, and the four embedded rods are slidably connected to the four arc-shaped guide grooves respectively.

[0011] Preferably, a scraping assembly is further included, which 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 mounted on the side wall of the outer cylinder, and the output end of the driving motor is fixedly connected to a threaded rod. A guide rod is fixedly mounted inside the outer cylinder, and the guide rod is parallel to the threaded rod.

[0012] Preferably, the scraping component includes a fixed shell, a threaded block is fixedly installed inside the fixed shell, the threaded block is threadedly connected to the threaded rod, the fixed shell is slidably connected to the guide rod, and a plurality of U-shaped scrapers are arranged at the bottom of the fixed shell, and the plurality of U-shaped scrapers correspond to a plurality of first dispersion holes.

[0013] Preferably, a second electric telescopic rod is fixedly installed on the inner wall of the fixed shell, and the telescopic end of the second electric telescopic rod is fixedly connected to a transmission plate. The transmission plate is located inside the fixed shell and is slidably connected to the fixed shell, and the tops of the multiple U-shaped scrapers are fixedly connected to the bottom of the transmission plate.

[0014] A method for purifying waste gas for carbon dioxide recovery, comprising the above-mentioned waste gas purification equipment for carbon dioxide recovery, and further comprising the following steps: S1, spraying, spraying lime water into the outer cylinder through the connecting pipe and the nozzle, the lime water accumulates at the bottom of the inner part of the outer cylinder, and when the liquid level is higher than the upper end of the first dispersion disk, the exhaust gas is introduced into the outer cylinder through the air inlet pipe; S2, purification, the waste gas entering the outer cylinder reacts with lime water to generate calcium sulfite and calcium sulfate precipitation, sulfur dioxide in the waste gas is removed, and the gas after reacting with lime water flows toward the nozzle through the grid holes formed by the first dispersion hole and the second dispersion hole, and the lime water sprayed by the nozzle further purifies the gas; 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 in the outer cylinder, and stir the exhaust gas bubbles entering the inner part of the outer cylinder; S4, adjustment, after purification for a period of time, the first electric telescopic rod drives the first dispersing disc to move upward, the first dispersing disc drives the second dispersing disc to rotate and move upward through the rotating ring, the four embedded rods installed on the side wall of the second dispersing disc slide along the four arc-shaped guide grooves respectively during the upward movement of the second dispersing disc, the second dispersing disc rotates °, the plurality of second dispersing holes and the plurality of first dispersing holes overlap, the first dispersing disc and the second dispersing disc are both separated from the lime water liquid surface, the U-shaped scraper is embedded in the first dispersing hole, the first electric telescopic rod drives the first dispersing disc and the second dispersing disc to move upward, and the U-shaped scraper is embedded in the second dispersing hole; S5, scraping, the driving unit drives the fixed housing to move, and the multiple U-shaped scrapers move along the inner walls of the first dispersion hole and the second dispersion hole to scrape off the sediment adhered to the inner walls of the dispersion holes, and the second electric telescopic rod drives the transmission plate to move back and forth horizontally, and the multiple U-shaped scrapers follow the transmission plate to scrape back and forth, and the lime water sprayed by the nozzle flushes the sediment scraped by the U-shaped scrapers into the accumulated lime water; S6, slag removal, the second dispersing disc moves upward and pulls the rotating shaft to move upward, the first stirring plate is pulled out from the inside of the second stirring plate by the rotating shaft, the third electric telescopic rod pushes the fan-shaped plate to drive the second mounting frame to slide upward along the side wall of the first mounting frame, after the trapezoidal sliding block slides to the upper end of the second sliding groove, the second mounting frame pulls the first mounting frame to move upward, the second stirring plate and the second mounting frame are located on the same side of the fan-shaped shell, the upper ends of the first stirring plate and the first mounting frame both extend out of the liquid surface of the lime water, the slag removal motor is started, the first stirring plate and the second stirring plate rotate to the other side of the fan-shaped shell, pushing the precipitate into the fan-shaped shell, after the fan-shaped plate moves down to close the fan-shaped shell, the water outlet discharges slag.

[0015] Compared with the prior art, the advantages of the present invention are: The present invention installs devices such as a fan-shaped shell, a screen and a fan-shaped plate. The rotating shaft drives the first stirring plate and the second stirring plate to rotate from one side of the fan-shaped shell to the other side, so that the sediment is pushed to the fan-shaped shell. The sediment is discharged after the fan-shaped plate is closed. The sediment in the lime water is continuously removed during the exhaust gas purification process to avoid floating sediment clogging the first dispersion holes and the second dispersion holes, affecting the exhaust gas circulation efficiency, and avoiding the negative impact of sediment accumulation on the sulfur dioxide removal efficiency. At the same time, it helps to maintain the liquid level inside the outer cylinder stable and avoid the liquid level being too high. It not only reduces the potential overflow risk, but also ensures the effective contact and reaction between the exhaust gas and the lime water, effectively purifies the sulfur dioxide in the exhaust gas, reduces its corrosion to the subsequent carbon dioxide recovery equipment, and improves the reliability and safety of the entire exhaust gas treatment system.

[0016] The present invention installs devices such as a nozzle, an outer cylinder and an air inlet pipe, and the exhaust gas enters the outer cylinder to undergo a preliminary reaction with the accumulated lime water, thereby removing most of the sulfur dioxide. The exhaust gas continues to rise and contacts the fresh lime water sprayed from the nozzle again, and a secondary reaction occurs. 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 undergo a full reaction, sulfur dioxide is more effectively absorbed and converted, thereby enhancing the purification effect of the exhaust gas, significantly reducing the sulfur dioxide content in the exhaust gas, and thus reducing the risk of equipment corrosion.

[0017] The present invention forms a grid-like hole by vertically forming the strip-shaped first dispersion hole and the second dispersion hole through the installation of the first dispersion plate and the second dispersion plate. When the exhaust gas bubbles pass through the grid-like hole, they are divided into more small bubbles, which effectively increases the contact area between the exhaust gas and the 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 helping to achieve effective mixing and reaction of the exhaust gas and the lime water in the entire reaction area, thereby enhancing the purification effect of the equipment.

[0018] The present invention installs devices such as U-shaped scrapers, fixed shells and transmission plates. Multiple groups of U-shaped scrapers scrape inside the first dispersion hole and the second dispersion hole to scrape off the sediment adhered to the inner wall of the dispersion hole. During the movement of the fixed shell, the second electric telescopic rod drives the transmission plate to move horizontally, so that the U-shaped scraper reciprocates along the inner wall of the fixed shell, which promotes the scraping of the sediment adhered to the inner wall of the dispersion hole by the U-shaped scraper, prevents the dispersion hole from being blocked due to the accumulation of sediment, ensures that the exhaust gas can flow smoothly, and improves the efficiency and effect of the exhaust gas treatment. The lime water sprayed by the nozzle flushes the sediment scraped by the U-shaped scraper into the accumulated lime water, thereby enhancing the cleaning effect of the dispersion hole.

[0019] The present invention installs a first stirring plate and a second stirring plate and other devices. After the slag removal motor is started, the rotating shaft drives the first stirring plate and the second stirring plate to rotate, and stirs the lime water gathered in the outer cylinder, so that the calcium hydroxide in the lime water and the sulfur dioxide in the exhaust gas are more fully contacted and mixed, and the reaction area between the two is increased, thereby increasing the rate of the chemical reaction. The stirring enables the sulfur dioxide in the exhaust gas to react with the lime water more comprehensively, so that it is 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, thereby realizing the coordinated purification of multiple components. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a waste gas purification device for carbon dioxide recovery and a purification method thereof proposed in the present invention.

[0021] Figure 2 This is a cross-sectional view of the overall structure of a waste gas purification device for carbon dioxide recovery and a purification method thereof proposed by the present invention.

[0022] Figure 3 This is a cross-sectional view of a shell component and an intake pipe structure of a waste gas purification device for carbon dioxide recovery and a purification method thereof proposed by the present invention.

[0023] Figure 4 This is a schematic structural diagram of a scraping component and a dispersing component of a waste gas purification device for carbon dioxide recovery and a purification method thereof proposed in the present invention.

[0024] Figure 5 This is a schematic diagram of the scraping component structure of a waste gas purification device for carbon dioxide recovery and a purification method thereof proposed in the present invention.

[0025] Figure 6 This is a schematic diagram of the dispersed component structure of a waste gas purification device for carbon dioxide recovery and a purification method thereof proposed in the present invention.

[0026] Figure 7 The present invention provides a waste gas purification device and a purification method for carbon dioxide recovery. Figure 6 Enlarged detail of point A in the middle.

[0027] Figure 8 This is a schematic diagram of the structure of the slag removal component of a waste gas purification device for carbon dioxide recovery and a purification method thereof proposed in the present invention.

[0028] Fig. 9 This is a schematic diagram of the disassembly of the rotating parts structure of a waste gas purification device for carbon dioxide recovery and a purification method thereof proposed in the present invention.

[0029] Fig.10 This is a schematic diagram of the disassembly of the collection component structure of a waste gas purification device for carbon dioxide recovery and a purification method thereof proposed in the present invention.

[0030] Fig.11 The present invention provides a waste gas purification device and a purification method for carbon dioxide recovery. Fig.10 Enlarged detail of point B in the middle.

[0031] In the figure: 1 shell assembly, 11 outer cylinder, 12 air outlet pipe, 13 support column, 14 arc guide groove, 15 first sliding groove, 2 scraping assembly, 21 driving part, 22 scraping component, 221 fixed shell, 222 thread block, 223 second electric telescopic rod, 224 transmission plate, 225 U-shaped scraper, 3 slag removal assembly, 31 fixed cylinder, 32 rotating component, 321 slag removal motor, 322 rotating plate, 323 rotating shaft, 324 fixed plate, 325 first stirring plate, 326 second stirring plate, 33 Collecting component, 331 third electric telescopic rod, 332 fan-shaped plate, 333 first installation frame, 334 second installation frame, 335 trapezoidal sliding bar, 336 trapezoidal sliding block, 337 second sliding groove, 338 screen, 34 fan-shaped shell, 35 water outlet, 4 air inlet pipe, 5 spray assembly, 51 connecting pipe, 52 nozzle, 6 dispersion assembly, 61 first electric telescopic rod, 62 first dispersion disk, 621 first dispersion hole, 63 second dispersion disk, 631 second dispersion hole, 64 embedded rod, 65 rotating ring. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] Reference Figures 1 to 11A waste gas purification device for carbon dioxide recovery includes a shell component 1, the shell component 1 includes an outer cylinder 11, the top of the outer cylinder 11 is fixedly connected with an outlet pipe 12, the bottom of the outer cylinder 11 is fixedly installed with a support column 13, the side wall of the outer cylinder 11 is fixedly connected with an inlet pipe 4, and the inner part of the outer cylinder 11 is provided with a spray component 5, the spray component 5 includes 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 with a nozzle 52, the nozzle 52 is located in the inner part of the outer cylinder 11, and is used for spraying lime water. The sulfur dioxide gas in the waste gas is a reducing and weakly oxidizing gas, and is also an acidic oxide, which can react with alkali to generate corresponding salt and water. The main component of lime water is hydrogen Calcium oxide, sulfur dioxide and calcium hydroxide react in an aqueous solution to generate calcium sulfite and water. The generated calcium sulfite is slightly soluble, so it will exist in the solution in the form of precipitation. The calcium sulfite is further oxidized to calcium sulfate. Calcium sulfate is insoluble and will also exist in the solution in the form of precipitation. The outer cylinder 11 is provided with a dispersion component 6 inside. The dispersion component 6 includes a first dispersion disk 62 and a second dispersion disk 63. The first dispersion disk 62 is located above the second dispersion disk 63. A plurality of first strip-shaped dispersion holes 621 are formed through the top of the first dispersion disk 62. A plurality of second strip-shaped dispersion holes 631 are formed through the top of the second dispersion disk 63. The first dispersion holes 621 and the second dispersion holes 631 are vertically formed in a grid shape. The first dispersion hole 621 and the second dispersion hole 631 have the same shape and size. The nozzle 52 is located above the first dispersion plate 62, and the nozzle 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 to react with the lime water at the bottom of the inner wall of the outer cylinder 11, passes through the second dispersion hole 631 and the first dispersion hole 621 from bottom to top, and finally reacts with the lime water sprayed by the nozzle 52 and is discharged from the air outlet pipe 12. The exhaust gas reacts with the accumulated lime water to remove most of the sulfur dioxide. The exhaust gas continues to rise and contacts with the fresh lime water sprayed by the nozzle 52 again to react with the secondary reaction. This continuous reaction process significantly increases the contact opportunity between sulfur dioxide and lime water, thereby improving The reaction efficiency is improved, so that the exhaust gas and lime water react fully, and sulfur dioxide is more effectively absorbed and converted, thereby enhancing the purification effect of the exhaust gas. The grid-like holes vertically formed by 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 helping to achieve effective mixing and reaction of the exhaust gas and lime water in the entire reaction area. The exhaust gas will produce a turbulent effect when passing through the grid-like holes. 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 than holes of other shapes (such as circular holes).

[0034] The inner wall of the outer cylinder 11 is fixedly mounted with a first electric telescopic rod 61, the bottom of the first electric telescopic rod 61 is fixedly connected to the top of the first dispersion disc 62, the inner wall of the outer cylinder 11 is provided with four arc-shaped guide grooves 14, the side wall of the second dispersion disc 63 is fixedly mounted with four embedded rods 64, the four embedded rods 64 are arranged in a circular array on the side wall of the second dispersion disc 63, the four embedded rods 64 are respectively slidably connected with the four arc-shaped guide grooves 14, the bottom of the first dispersion disc 62 is rotatably connected with the second dispersion disc 63 through a rotating ring 65, the cross section of the rotating ring 65 is The second dispersion disk 63 is trapezoidal in shape to prevent the second dispersion disk 63 from separating from the first dispersion disk 62. The first electric telescopic rod 61 pulls the first dispersion disk 62 upward, and the second dispersion disk 63 rotates upward under the action of the rotating ring 65. The four embedded rods 64 installed on the side wall of the second dispersion disk 63 slide along the corresponding arc-shaped guide grooves 14. The second dispersion disk 63 rotates 90° under the action of the embedded rods 64 and the arc-shaped guide grooves 14, so that the first dispersion hole 621 and the second dispersion hole 631 coincide with each other. At this time, the first dispersion disk 62 and the second dispersion disk 63 are separated from the lime water liquid surface.

[0035] The outer cylinder 11 is provided with a scraping assembly 2 inside, and the scraping assembly 2 includes a driving part 21 and a scraping component 22. The driving part 21 includes a threaded rod, a driving motor and a guide rod. The driving motor is fixedly mounted on the outer wall of the outer cylinder 11, and the threaded rod is fixedly connected to the output shaft of the motor. The guide rod is fixedly mounted on the inner wall of the outer cylinder 11, and the guide rod is parallel to the threaded rod. The scraping component 22 includes a fixed shell 221, and a threaded block 222 is fixedly mounted inside the fixed shell 221. The threaded block 222 is threadedly connected to the threaded rod, and the fixed shell 221 is slidably connected to the guide rod. The inner wall of the fixed shell 221 is fixedly mounted with a first The second electric telescopic rod 223, the telescopic end of the second electric telescopic rod 223 is fixedly connected with a transmission plate 224, the transmission plate 224 is slidably connected to the inner wall of the fixed shell 221, and a plurality of U-shaped scrapers 225 are fixedly installed at the bottom of the transmission plate 224, and the plurality of U-shaped scrapers 225 are located outside the fixed shell 221 and correspond to the plurality of first dispersion holes 621. After the first dispersion holes 621 and the second dispersion holes 631 overlap, the first electric telescopic rod 61 pulls the first dispersion disc 62 and the second dispersion disc 63 to move upward again, and the end of the arc guide groove 14 is vertically upward, and the embedded rod 64 moves along the arc guide groove 1 The first sliding movement drives the second dispersion plate 63 to adjust the angle, and the second sliding movement along the arc-shaped guide groove 14 only moves vertically upward, so that the U-shaped scraper 225 can be embedded in the first dispersion hole 621 and the second dispersion hole 631. The fixed housing 221 reciprocates under the action of the driving part 21, and the plurality of U-shaped scrapers 225 move synchronously with the fixed housing 221 to scrape off the sediment adhered to the inner wall of the first dispersion hole 621 and the second dispersion hole 631, so that the sediment adhered to the inner wall of the dispersion hole can be removed in an all-round and deep manner, thereby ensuring the thoroughness of cleaning and effectively preventing the accumulation of sediments and the resulting The blockage problem caused by this is eliminated, and at the same time, the second electric telescopic rod 223 is started, so that the transmission plate 224 reciprocates on the inner wall of the fixed shell 221, and the U-shaped scraper 225 moves synchronously with the transmission plate 224, so that the U-shaped scraper 225 moves along the inner walls of the first dispersion hole 621 and the second dispersion hole 631 while moving back and forth itself, further enhancing the cleaning effect, ensuring that the dispersion holes are unobstructed, and improving the efficiency and effect of exhaust gas treatment. The lime water sprayed by the nozzle 52 flushes the scraped sediment into the accumulated lime water at the lower end of the outer cylinder 11, thereby enhancing the cleaning effect of the dispersion holes.

[0036] The outer cylinder 11 is provided with a slag removal assembly 3 inside, and the slag removal assembly 3 includes a fixed cylinder 31 and a rotating component 32, the fixed cylinder 31 is fixedly installed at the bottom center of the outer cylinder 11, and the rotating component 32 includes a slag removal motor 321, and the slag removal motor 321 is fixedly installed at the bottom of the fixed cylinder 31, and the output end of the slag removal motor 321 is fixedly connected with a rotating plate 322, and the outer wall of the rotating plate 322 is sleeved with a rotating shaft 323, and the rotating shaft 323 is slidably connected with the rotating plate 322, and the rotating shaft 323 is located inside the fixed cylinder 31, and the top of the rotating shaft 323 is rotatably connected with a fixed disk 324, and the fixed disk 3 The top of the outer cylinder 11 is fixedly connected to the bottom of the second dispersing disk 63. When the second dispersing disk 63 moves upward, the rotating shaft 323 is also pulled upward by the fixed disk 324, so that the rotating shaft 323 extends out of the fixed cylinder 31. The side wall of the rotating shaft 323 is fixedly installed with a first stirring plate 325. The bottom of the inner wall of the outer cylinder 11 is provided with a first sliding groove 15. The inner part of the outer cylinder 11 is provided with a second stirring plate 326. The bottom of the second stirring plate 326 is fixedly installed with a trapezoidal slider. 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. The second stirring plate 326 is fixedly installed with a trapezoidal slider. 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. The top of the mixing plate 326 is provided with a receiving groove for receiving the first stirring plate 325, and the first stirring plate 325 is slidably connected to the receiving groove. When the rotating shaft 323 extends upward from the inside of the fixed cylinder 31, it drives the first stirring plate 325 to extend from the second stirring plate 326. The slag removal motor 321 is started, and 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 to stir the lime water in the outer cylinder 11. The first sliding groove 15 is not a complete circle, and the second The stirring plate 326 rotates alternately clockwise and counterclockwise continuously, stirring the lime water continuously, so that the calcium hydroxide in the lime water and the sulfur dioxide in the exhaust gas can contact and mix more fully, increasing the reaction area between the two, thereby increasing the rate of the chemical reaction. Through stirring, the sulfur dioxide in the exhaust gas can react with the lime water more comprehensively, thereby being more thoroughly absorbed and converted, which helps to reduce the emission concentration of sulfur dioxide in the exhaust gas and improve the purification effect of the exhaust gas. Stirring also helps to mix other pollutants in the exhaust gas (such as dust, etc.) with the lime water to achieve multi-component synergistic purification.

[0037] A fan-shaped shell 34 is fixedly installed at the bottom of the outer cylinder 11, and a water outlet 35 is arranged at the bottom of the fan-shaped shell 34. Both sides of the fan-shaped shell 34 correspond to the first sliding groove 15. A collecting component 33 is arranged inside the fan-shaped shell 34. The collecting component 33 includes a third electric telescopic rod 331 fixedly installed at the bottom of the inner wall of the fan-shaped shell 34. The top of the third electric telescopic rod 331 is fixedly connected with a fan-shaped plate 332, and the fan-shaped plate 332 is used to close the fan-shaped shell 34. A first mounting frame 333 and a second mounting frame 334 are arranged at the bottom of the fan-shaped plate 332. The top of the second mounting frame 334 is fixedly connected to the bottom of the fan-shaped plate 332. A trapezoidal sliding bar 335 is fixedly installed on the side wall of the second mounting frame 334. The trapezoidal sliding bar 335 is connected to the first mounting frame 333. The first mounting frame 333 is slidably connected, the side wall of the first mounting frame 333 is provided with a vertical second sliding groove 337, the second mounting frame 334 is fixedly provided with a trapezoidal sliding block 336 on one side close to the first mounting frame 333, the trapezoidal sliding block 336 is slidably connected with the second sliding groove 337, the side walls of the first mounting frame 333 and the second mounting frame 334 are respectively provided with a screen 338, when the second dispersion disk 63 moves upward, the rotating shaft 323 drives the first stirring plate 325 to move upward at the same time, the third electric telescopic rod 331 pushes the fan-shaped plate 332 to move upward to open the fan-shaped shell 34, and the fan-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 After that, the second mounting frame 334 pulls the first mounting frame 333 to move upward together, and the second mounting frame 334 is flush with the side of the fan-shaped plate 332. Before the U-shaped scraper 225 scrapes off the sediment on the inner wall of the first dispersion hole 621 and the second dispersion hole 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 surface of the lime water. The slag removal motor 321 is started to rotate the first stirring plate 325 and the second stirring plate 326 to the other side of the fan-shaped housing 34, and the lime water passes through the screens 338 on the first mounting frame 333 and the second mounting frame 334. The sediment is intercepted by the screen 338 and remains on the first stirring plate 325 and the second stirring plate 32 6. Between the first mounting frame 333 and the second mounting frame 334, after the U-shaped scraper 225 finishes scraping, the second dispersing disc 63 moves downward to reset, the third electric telescopic rod 331 retracts, the fan-shaped plate 332 moves downward to close the fan-shaped shell 34, and the sediment enters the fan-shaped shell 34. The water and sediment inside the fan-shaped shell 34 are discharged through the water outlet 35. During the exhaust gas purification process, the sediment in the lime water is continuously removed to avoid the negative impact of the sediment accumulation on the sulfur dioxide removal efficiency. The regular discharge of part of the solution and sediment helps to maintain the liquid level inside the outer cylinder 11 stable and avoid the liquid level being too high. It not only reduces the potential overflow risk, but also ensures the effective contact and reaction between the exhaust gas and the lime water, and effectively purifies the sulfur dioxide in the exhaust gas.The corrosion to the subsequent carbon dioxide recovery equipment is reduced, the service life of the equipment is extended, the maintenance cost is reduced, and the reliability and safety of the entire exhaust gas treatment system are improved. The reduction of particulate impurities in the purified exhaust gas means that the impurity content in the recovered carbon dioxide is also reduced accordingly, which improves the recovery quality of carbon dioxide and makes it more suitable for subsequent application and storage. The lime water sprayed by the nozzle 52 is not only used to react with the exhaust gas, but also used to reduce dust on the precipitated dust with finer particle size, realizing the effective utilization of resources and reducing the emission of wastewater and exhaust gas.

[0038] A method for purifying waste gas for carbon dioxide recovery, using the above-mentioned waste gas purification equipment for carbon dioxide recovery, mainly comprises the following steps: S1, spraying, spraying lime water into the outer tube 11 through the connecting pipe 51 and the nozzle 52, the lime water accumulates at the bottom of the outer tube 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 tube 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 reacting with lime water flows toward the nozzle 52 through the grid holes formed by the first dispersion holes 621 and the second dispersion holes 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 dispersing disc 62 to move upward, the first dispersing disc 62 drives the second dispersing disc 63 to rotate and move upward through the rotating ring 65, and the four embedded rods 64 installed on the side wall of the second dispersing disc 63 slide along the four arc-shaped guide grooves 14 respectively during the upward movement of the second dispersing disc 63, the second dispersing disc 63 rotates 90°, the plurality of second dispersing holes 631 overlap with the plurality of first dispersing holes 621, the first dispersing disc 62 and the second dispersing disc 63 are separated from the lime water liquid surface, the U-shaped scraper 225 is embedded in the first dispersing hole 621, the first electric telescopic rod 61 drives the first dispersing disc 62 and the second dispersing disc 63 to move upward, and the U-shaped scraper 225 is embedded in the second dispersing hole 631; S5, scraping. The driving unit 21 drives the fixed housing 221 to move, and the multiple 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. The second electric telescopic rod 223 drives the transmission plate 224 to move back and forth horizontally. The multiple U-shaped scrapers 225 follow the transmission plate 224 to scrape back and forth. The lime water sprayed by the nozzle 52 flushes the sediment scraped by the U-shaped scraper 225 into the accumulated lime water. S6, slag removal, the second dispersing disk 63 moves upward to pull the rotating shaft 323 to move 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 to move upward, the second stirring plate 326 and the second mounting frame 334 are located on the same side of the fan-shaped shell 34, the upper ends of the first stirring plate 325 and the first mounting frame 333 both extend 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 rotate to the other side of the fan-shaped shell 34, pushing the precipitate into the fan-shaped shell 34, after the fan-shaped plate 332 moves down to close the fan-shaped shell 34, the water outlet 35 discharges slag.

[0039] In the present invention, when in use, firstly, lime water is sprayed into the outer cylinder 11 through the connecting pipe 51 and the nozzle 52, and the lime water accumulates at the lower end of the outer cylinder 11 for a period of time, so that the liquid level of the lime water in the outer cylinder 11 is higher than the upper end of the first dispersion plate 62, and the exhaust gas is introduced into the outer cylinder 11 through the air inlet pipe 4. Since the height of the 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, and the sulfur dioxide in the exhaust gas contacting with the lime water will react with the lime water to generate calcium sulfite and calcium sulfate precipitation, thereby being able to It is able to remove sulfur dioxide from the exhaust gas. Since the first dispersion hole 621 and the second dispersion hole 631 are vertically arranged at this time, the overlapping position of the first dispersion hole 621 and the second dispersion hole 631 forms a smaller gap. The exhaust gas bubbles will be divided into more small bubbles when passing through the gap, which can effectively increase the contact area between the exhaust gas and the lime water. As the exhaust gas bubbles continue to rise, the bubbles will move upward to above the lime water surface, 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 from the exhaust gas.

[0040] After the device is used for a period of time, the first dispersing disc 62 is moved upward by the first electric telescopic rod 61. Since the second dispersing disc 63 is rotatably connected to the lower end of the first dispersing disc 62 through the rotating ring 65, and the cross section of the rotating ring 65 is trapezoidal, the second dispersing disc 63 can be prevented from separating from the first dispersing disc 62. When the first dispersing disc 62 moves upward, the second dispersing disc 63 can also be driven to move upward. At the same time, since the four sets of embedded rods 64 are respectively embedded and slidably connected with the four sets of arc-shaped guide grooves 14, when the second dispersing disc 63 moves upward, the four sets of embedded rods 64 are respectively embedded and slidably connected with the four sets of arc-shaped guide grooves 14. The arc-shaped guide groove 14 can guide the four groups of rotating rings 65 respectively, so that the second dispersion plate 63 rotates 90 degrees, so that the second dispersion hole 631 and the first dispersion hole 621 can overlap. At this time, the U-shaped scraper 225 is embedded in the first dispersion hole 621, and the first dispersion plate 62 and the second dispersion plate 63 are separated from the lime water liquid surface. Then, the first dispersion plate 62 continues to move upward through the first electric telescopic rod 61, so that the U-shaped scraper 225 can penetrate the first dispersion hole 621 and the second dispersion hole 631. The fixed housing 221 is arranged inside the fixed housing 221, and the fixed housing 221 can be driven to move along the length direction of the first dispersion hole 621 through the driving part 21, so that the multiple groups of U-shaped scrapers 225 can scrape inside the first dispersion hole 621 and the second dispersion hole 631 respectively, and the sediment adhered to the inner wall of the first dispersion hole 621 and the second dispersion hole 631 can be scraped off. At the same time, during the movement of the fixed housing 221, the transmission plate 224 can be driven to move horizontally back and forth through the multiple groups of second electric telescopic rods 223, so that the U-shaped scraper 225 can move in the first dispersion hole 621 and the second dispersion hole 631. Scraping the inner walls of the dispersion holes 621 and the second dispersion holes 631 back and forth 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 generated precipitates clogging the first dispersion holes 621 and the second dispersion holes 631, resulting in the exhaust gas being unable to flow smoothly. The lime water sprayed by the nozzle 52 can flush the precipitates scraped off by the U-shaped scraper 225 into the lime water accumulated at the lower end of the outer tube 11. By collecting the lime water sprayed from the nozzle 52 and reusing it, the resource utilization rate can be improved and the waste of lime water can be reduced.

[0041] In the process of exhaust 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 in 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, so that the exhaust gas bubbles entering the outer cylinder 11 can be stirred, and the dispersion of the bubbles and the contact reaction of the exhaust gas with the limestone can be promoted, so as to improve the removal efficiency of sulfur dioxide. Since the rotating shaft 323 is engaged and rotatably connected with the fixed disk 324, and the upper end of the fixed disk 324 is fixed to the lower end of the second dispersion disk 63 The second dispersing plate 63 is connected to the second dispersing plate 63 by sliding connection, and the lower end of the second stirring plate 326 is slidably connected to the first sliding groove 15 through a trapezoidal slider. The two ends of the first sliding groove 15 are flush with the two sides of the fan-shaped plate 332. When the second dispersing plate 63 moves upward, the rotating shaft 323 can be pulled upward as well, so that the first stirring plate 325 is pulled out from the inside of the second stirring plate 326. The fan-shaped plate 332 can be pushed upward by the third electric telescopic rod 331, so that the second mounting frame 334 slides 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, and the second mounting frame 334 will be flush with the side of the fan-shaped plate 332. When the U-shaped scraper 225 scrapes the first dispersing hole 62 1 and the second dispersion hole 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 surface of the lime water, and the first mounting frame 333 and the second mounting frame 334 are moved upward by the third electric telescopic rod 331, so that the second mounting frame 334 is fitted with the second stirring plate 326. At this time, the upper end of the first mounting frame 333 also extends out of the liquid surface of the lime water. Subsequently, the first stirring plate 325 and the second stirring plate 326 are rotated by the slag removal motor 321, so that the lime water can be moved to pass through the screen 338, so that the precipitate remains on the first stirring plate 325, the second stirring plate 326, and the first mounting frame 333. and the second mounting frame 334. When the U-shaped scraper 225 finishes scraping, the second dispersion disc 63 moves downward to reset. At the same time, the fan-shaped plate 332 is also moved downward by the third electric telescopic rod 331, so that the sediment can be scraped into the fan-shaped shell 34. After the fan-shaped plate 332 contacts the inner wall of the lower end of the outer cylinder 11, the top of the fan-shaped shell 34 of the outer cylinder 11 can be closed again. At this time, the water and sediment in the fan-shaped shell 34 can be discharged through the water outlet 35. The sediment in the lime water can be removed without stopping the gas purification process, so as to avoid the adverse effect of excessive sediment on the reaction of sulfur dioxide and lime water. At the same time, it can avoid the floating sediment from clogging the first dispersion hole 621 and the second dispersion hole 631. By discharging the sediment regularly,The solution inside the outer cylinder 11 can be partially discharged while discharging the precipitate, which can prevent the liquid level inside the outer cylinder 11 from being too high. The limestone sprayed by the nozzle 52 can also reduce the finer precipitate dust, reduce the precipitate discharged with the purified exhaust gas, and effectively reduce the internal particulate impurities during carbon dioxide recovery. By purifying sulfur dioxide in the exhaust gas, sulfur dioxide can be prevented from corroding the carbon dioxide recovery equipment, thereby reducing the impurity content of the recovered carbon dioxide.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should 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 at 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), respectively.

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 is fixedly mounted on 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 mounted 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 mounted 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 comprises a spraying assembly (5), the spraying assembly (5) comprising a connecting pipe (51) fixedly connected to the side wall of the outer cylinder (11), the end of the connecting pipe (51) being fixedly connected to a spray head (52), the spray head (52) being located above the second stirring plate (326).

4. The waste gas purification equipment for carbon dioxide recovery according to claim 3, characterized in that: The invention 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).

5. The waste gas purification equipment for carbon dioxide recovery according to claim 4, characterized in that: 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.

6. The waste gas purification equipment for carbon dioxide recovery according to claim 5, characterized in that: 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).

7. The waste gas purification equipment for carbon dioxide recovery according to claim 6, characterized in that: The device further comprises a scraping assembly (2), the scraping assembly (2) being located above the dispersion assembly (6), the scraping assembly (2) comprising a driving unit (21) and a scraping component (22), the driving unit (21) comprising a driving motor fixedly mounted on the side wall of the outer cylinder (11), the output end of the driving motor being fixedly connected to a threaded rod, and a guide rod being fixedly mounted inside the outer cylinder (11), and the guide rod being parallel to the threaded rod.

8. The waste gas purification equipment for carbon dioxide recovery according to claim 7, characterized in that: 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).

9. The waste gas purification equipment for carbon dioxide recovery according to claim 8, 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).

10. 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 9 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 plate (62), 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 precipitates, 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 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 embedded 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) degrees, the plurality of second dispersion holes (631) and the plurality of first dispersion holes (621) overlap, the first dispersion plate (62) and the second dispersion plate (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 plate (62) and the second dispersion plate (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 plate (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 fan-shaped housing (34) is 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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