Dual-alkali desulfurization device

Abstract

The utility model provides a dual-alkali desulfurization device, which belongs to the technical field of environment-friendly desulfurization and comprises an absorption tower, a sedimentation tank and a regeneration tank which are connected in sequence, the bottom of the absorption tower is connected with a sewage inlet of the sedimentation tank through a liquid discharge pump; a clear water outlet of the sedimentation tank is connected with the regeneration tank; the middle of the absorption tower is connected with a flue gas inlet pipe, the top of the absorption tower is connected with a desulfurized flue gas treatment unit, and the bottom of the absorption tower is also connected with a spraying part at the upper part of the absorption tower through a circulating pump and is also connected with an absorption liquid inlet pipe; the regeneration tank is also connected with a calcium alkali inlet pipe; a filter screen is arranged between the sewage inlet and the clear water outlet of the sedimentation tank; a screen cleaning mechanism is arranged at the bottom of the filter screen; the net cleaning mechanism comprises a sleeve arranged on the outer side of the rotating shaft in a sleeving mode, a first brush is fixedly connected to the sleeve, and bristles of the first brush are arranged upwards and abut against the bottom of the filter net. The device is good in desulfurization effect, high in sedimentation and filtration efficiency of the sedimentation tank, good in sedimentation separation effect and remarkable in subsequent gypsum product quality improvement effect.

Description

Technical Field

[0001] The utility model relates to the technical field of environmentally friendly desulfurization, in particular to a double alkali desulfurization device. Background Art

[0002] The dual-alkali desulfurization technology uses highly active sodium hydroxide as an absorbent, which is then pressurized by a circulating pump and fed into the spray layer of an absorption tower. The spray absorbs SO₂ from the flue gas, achieving desulfurization. The resulting absorption liquid is then regenerated with calcium hydroxide. Because two different types of alkali liquor are used in the absorption and absorption liquid regeneration processes, it is called the dual-alkali method. If only one regeneration tank is provided in a dual-alkali desulfurization device, the sodium hydroxide, gypsum, and dust impurities in the flue gas generated by regeneration will mix in the regeneration tank, resulting in the calcium sulfite and calcium sulfate in the regeneration tank being contaminated with dust impurities that are difficult to remove. This results in the regenerated gypsum product being of poor quality, difficult to utilize, and becoming waste residue, resulting in a waste of resources. Therefore, in the prior art, a sedimentation tank is provided between the absorption tower and the regeneration tank to separate dust impurities in the absorption liquid through sedimentation. The precipitated absorption liquid is then regenerated to improve the quality of the gypsum product in the regeneration tank. However, when existing sedimentation tanks are used to precipitate the absorption liquid, they often only perform sedimentation but do not have a filtering function, and cannot completely separate the absorption liquid and dust impurities, resulting in poor sedimentation and separation effects, low sedimentation efficiency, and unsatisfactory effects on improving the quality of subsequent gypsum products. Utility Model Content

[0003] The utility model provides a double alkali desulfurization device, which is used to solve the problem of poor quality of gypsum products formed in the regeneration tank caused by low precipitation efficiency and poor precipitation separation effect in the double alkali desulfurization device in the prior art.

[0004] The utility model provides a double-alkali desulfurization device, comprising: an absorption tower, a sedimentation tank and a regeneration tank which are connected in sequence; the bottom of the absorption tower is connected to the sewage inlet at the bottom of the sedimentation tank through a drainage pump, and the clean water outlet at the top of the sedimentation tank is connected to the regeneration tank; the middle of the absorption tower is connected to a flue gas inlet pipe, the top of the absorption tower is connected to a desulfurization flue gas treatment unit, the bottom of the absorption tower is also connected to a spray component at the top of the absorption tower through a circulation pump, and the bottom of the absorption tower is also connected to an absorption liquid inlet pipe; the regeneration tank is also connected to a calcium alkali inlet pipe, and the sodium alkali outlet of the regeneration tank is connected to the circulating liquid inlet at the bottom of the absorption tower.

[0005] Preferably, a filter screen is provided between the sewage inlet and the clean water outlet of the sedimentation tank, a sewage outlet is provided at the center of the bottom of the sedimentation tank, and a screen cleaning mechanism is provided at the bottom of the filter screen; a support plate is installed on the top of the sedimentation tank, a motor is installed on the support plate, and the output end of the motor is connected to a rotating shaft extending to the bottom of the sedimentation tank; the screen cleaning mechanism includes a sleeve arranged on the outside of the rotating shaft, and one end of a first brush is fixed to the sleeve, and the bristles of the first brush are arranged upward and abut against the bottom of the filter screen.

[0006] Preferably, the screen cleaning mechanism further comprises a second brush, one end of the second brush is fixedly connected to the sleeve, and the bristles of the second brush are arranged downward and abut against the top of the filter screen.

[0007] Preferably, the sedimentation tank is a cylindrical structure; the rotating shaft is arranged at the center of the sedimentation tank, and the rotating shaft passes through the filter screen.

[0008] Preferably, the filter screen is formed by splicing two symmetrical semicircular arc filter screens.

[0009] Preferably, a scraping mechanism is provided at the bottom of the sedimentation tank, and the scraping mechanism includes auxiliary plates symmetrically fixed on both sides of the rotating shaft, and two fixed cylinders are symmetrically provided on each auxiliary plate, and a spring is installed inside each fixed cylinder. A connecting rod is also slidably connected in each fixed cylinder, and the two ends of the spring are respectively connected to the top wall of the fixed cylinder and the top of the connecting rod; the bottom of the two connecting rods connected to the same auxiliary plate is connected to the same scraping plate, and the bottom of the scraping plate abuts against the bottom surface of the sedimentation tank.

[0010] Preferably, each scraper blade is arc-shaped, and bulges toward a side away from the advancing direction.

[0011] Preferably, a plurality of openings are provided on the lower side of each scraper blade, and a guide plate is fixed to each opening, and the guide plate is arranged on the back side of the forward direction of the scraper blade.

[0012] Preferably, the guide plate is L-shaped or arc-shaped, and the openings between the guide plate and the scraper plate are both oriented toward the rotation axis located at the center of the sedimentation tank.

[0013] The dual-alkali desulfurization device provided by the utility model provides a sedimentation tank between the absorption tower and the regeneration tank, and provides a filter screen in the sedimentation tank, so that the absorption liquid performs an initial precipitation on impurities such as dust and solid particles contained in the flue gas in the sedimentation tank, and then passes through the filter screen for a secondary filtration upward to further remove impurities. This can not only improve the quality of the gypsum in the regeneration tank, but also improve the quality of the sodium-alkali absorption liquid in the regeneration cycle, which is beneficial to improving the desulfurization effect of the absorption tower, so that the desulfurization efficiency of the dual-alkali desulfurization device can reach more than 90%.

[0014] The screen cleaning mechanism in the sedimentation tank of the dual-alkali desulfurization device can brush and clean the filter screen on both the upper and lower sides so that the filter screen can quickly restore its filtering effect, ensuring that solid impurities in the absorption liquid are filtered while also ensuring that the speed at which the filter screen filters the absorption liquid will not be affected by solid sediment, thereby improving the separation effect and sedimentation separation rate of the sedimentation tank, and further improving the quality of the gypsum formed in the subsequent regeneration tank, so that the gypsum with improved quality can be comprehensively utilized as waste, thereby reducing the operating costs of the dual-alkali desulfurization device.

[0015] The scraping mechanism in the sedimentation tank of the dual-alkali desulfurization device can prevent the slurry in the sedimentation tank from easily hardening and solidifying or the formation of sludge in dead corners during sewage discharge, thereby affecting the sedimentation efficiency. The scraper can move smoothly and continuously, thereby better scraping and loosening the slurry or sludge, so that more impurities can be discharged through the sewage outlet in time, improving the sewage discharge efficiency and sewage discharge effect, thereby leaving enough space to effectively precipitate the impurity particles carried in the absorption liquid, and while scraping the sludge efficiently, it can extend the service life of the scraper and save the cost of repairing and replacing the scraper. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic structural diagram of a dual alkali desulfurization device provided in one embodiment of the present invention;

[0018] Figure 2 A schematic structural diagram of a sedimentation tank provided in one embodiment of the present invention;

[0019] Figure 3 A schematic structural diagram of a mud scraping mechanism for a sedimentation tank provided in one embodiment of the present utility model;

[0020] Figure 4 This is a schematic structural diagram of a mud scraper provided in one embodiment of the present invention.

[0021] Description of reference numerals:

[0022] 1. Absorption tower, 2. Sedimentation tank, 3. Regeneration tank, 4. Drain pump, 5. Flue gas inlet pipe, 6. Circulation pump, 7. Absorption liquid inlet pipe, 8. Calcium alkali inlet pipe, 9. Circulating liquid inlet, 21. Sewage inlet, 22. Clean water outlet, 23. Filter, 24. Sewage outlet, 25. Support plate, 26. Motor, 27. Rotating shaft, 281. Sleeve, 282. First brush, 283. Second brush, 291. Auxiliary plate, 292. Fixed cylinder, 293. Spring, 294. Connecting rod, 295. Scraper, 296. Guide plate. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts also fall within the scope of protection of the present invention.

[0024] like Figure 1 and Figure 2 The utility model is a dual-alkali desulfurization device, comprising: an absorption tower 1, a sedimentation tank 2 and a regeneration tank 3 connected in sequence; the bottom of the absorption tower 1 is connected to the sewage inlet 21 at the bottom of the sedimentation tank 2 through a drainage pump 4, and the clean water outlet 22 at the top of the sedimentation tank 2 is connected to the regeneration tank 3; a flue gas inlet pipe 5 is connected to the middle of the absorption tower 1, the top of the absorption tower 1 is connected to the desulfurization flue gas treatment unit, the bottom of the absorption tower 1 is also connected to the spray component at the top of the absorption tower 1 through a circulation pump 6, and the bottom of the absorption tower 1 is also connected to an absorption liquid inlet pipe 7; the regeneration tank 3 is also connected to a calcium alkali inlet pipe 8, and the sodium alkali outlet of the regeneration tank 3 is connected to the circulating liquid inlet 9 at the bottom of the absorption tower 1.

[0025] like Figure 2 Preferably, a filter screen 23 is provided between the sewage inlet 21 and the clean water outlet 22 of the sedimentation tank 2, a sewage outlet 24 is opened at the center position of the bottom of the sedimentation tank 2, and a screen cleaning mechanism is provided at the bottom of the filter screen 23; a support plate 25 is installed on the top of the sedimentation tank 2, and a motor 26 is installed on the support plate 25, and the output end of the motor 26 is connected to a rotating shaft 27 extending to the bottom of the sedimentation tank 2; the screen cleaning mechanism includes a sleeve 281 sleeved on the outside of the rotating shaft 27, and one end of a first brush 282 is fixed to the sleeve 281, and the bristles of the first brush 282 are arranged upward and abut against the bottom of the filter screen 23.

[0026] Flue gas enters absorption tower 1 through flue gas inlet pipe 5 connected to the middle of absorption tower 1. It comes into contact with the absorption liquid in the spray component, which is delivered by circulation pump 6 at the bottom of absorption tower 1. (The absorption liquid is usually sodium alkali, which can be replenished into absorption tower 1 through absorption liquid inlet pipe 7 for circulation.) The sodium alkali reacts with sulfides (such as sulfur dioxide) in the flue gas and converts them into water-soluble sulfide salts, which are ultimately collected at the bottom of absorption tower 1. The desulfurized flue gas is then delivered to the desulfurization flue gas treatment unit through the top of absorption tower 1 for treatment and discharge. When the sulfide content collected in the absorption liquid at the bottom of the absorption tower 1 is high, the absorption liquid at the bottom of the tower is sent to the sedimentation tank 2 through the drainage pump 4 and the sewage inlet 21. After the absorption liquid performs the initial precipitation of impurities such as dust and solid particles contained in the flue gas in the sedimentation tank 2, it is further filtered upward through the filter 23 for secondary filtration to remove impurities, and then discharged into the regeneration tank 3 from the clean water outlet 22 at the upper part of the sedimentation tank 2. The absorption liquid after impurity removal reacts with the calcium alkali from the calcium alkali inlet pipe 8 in the regeneration tank 3 to generate precipitates such as calcium sulfite and calcium sulfate. The sodium alkali formed by regeneration is returned to the absorption tower 1 through the circulating liquid inlet 9 for recycling. Removing impurities from the absorption liquid by the sedimentation tank 2 can not only improve the quality of the gypsum in the regeneration tank 3, but also improve the quality of the regenerated sodium alkali absorption liquid, which is beneficial to improving the desulfurization effect of the absorption tower 1, so that the desulfurization efficiency of the dual alkali desulfurization device can reach more than 90%.

[0027] During long-term operation, a large amount of impurities such as dust and solid particles will accumulate at the bottom of the sedimentation tank 2. The slurry or sludge formed by these impurities needs to be regularly removed through the sewage outlet 24. The mesh size of the filter 23 is selected according to the particle size of the dust and solid particles entrained in the flue gas, which is not limited here. During long-term filtering work, dirt will inevitably form on the filter screen 23. In order to avoid the problem of scaling of the filter screen 23 affecting the filtering efficiency, the motor 26 on the support plate 25 drives the rotating shaft 27 to rotate, thereby driving the sleeve 281 mounted on the rotating shaft 27 to rotate, and then driving the first brush 282 to rotate. During the rotation process, the bristles of the first brush 282 contact the bottom of the filter screen 23 and can clean the dirt deposited on the bottom of the filter screen 23 and the meshes, thereby restoring the filtering effect of the filter screen 23, ensuring the filtration of solid impurities in the absorption liquid, and also ensuring that the speed of the filter screen 23 filtering the absorption liquid will not be affected by the solid precipitation, thereby improving the precipitation filtration efficiency and precipitation separation effect of the sedimentation tank 2, and then improving the quality of the gypsum formed in the subsequent regeneration tank 3, so that the improved quality gypsum can be comprehensively utilized for waste, thereby reducing the operating cost of the dual alkali desulfurization device.

[0028] like Figure 2Preferably, the screen cleaning mechanism further includes a second brush 283. One end of the second brush 283 is fixedly connected to the sleeve 281, and the bristles of the second brush 283 are arranged downward and abut against the top of the filter screen 23. The second brush 283 and the first brush 282 are clamped on both sides of the filter screen 23. As the second brush 283 rotates with the rotating shaft 27, they can brush and clean the filter screen 23 from both sides, thereby quickly restoring the filtration effect of the filter screen 23, improving the separation effect of the sedimentation tank 2, and increasing the sedimentation separation rate of the sedimentation tank 2. The second brush 283 and the first brush 282 can be arranged symmetrically or staggered, and the cleaning effect can be achieved.

[0029] Preferably, the sedimentation tank 2 is a cylindrical structure; the rotating shaft 27 is arranged at the center of the sedimentation tank 2 , and the rotating shaft 27 passes through the filter screen 23 .

[0030] Preferably, the filter screen 23 is composed of two symmetrical semicircular filter screens. The screen cleaning mechanism performs a circular motion around the rotating shaft 27. In order to fully clean the filter screen 23 without leaving any dead corners, the sedimentation tank 2 and the filter screen 23 are both configured to have a circular cross-section. The circular sedimentation tank 2 occupies a relatively small area, has a simple structure, is easy to maintain, and has relatively low operating and maintenance costs.

[0031] like Figure 3 Preferably, a scraping mechanism is provided at the bottom of the sedimentation tank 2, and the scraping mechanism includes auxiliary plates 291 symmetrically fixed on both sides of the rotating shaft 27, and two fixed cylinders 292 are symmetrically provided on each auxiliary plate 291, and a spring 293 is installed inside each fixed cylinder 292. A connecting rod 294 is also slidably connected in each fixed cylinder 292, and the two ends of the spring 293 are respectively connected to the top wall of the fixed cylinder 292 and the top of the connecting rod 294; the bottom of the two connecting rods 294 connected to the same auxiliary plate 291 is connected to the same scraping plate 295, and the bottom of the scraping plate 295 is in contact with the bottom surface of the sedimentation tank 2.

[0032] To prevent the slurry in sedimentation tank 2 from hardening or forming sludge in dead corners during sewage discharge, which can affect sedimentation efficiency, a scraping mechanism is installed at the bottom of sedimentation tank 2. The scraping mechanism also rotates in a circular motion along with rotating shaft 27. Rotating shaft 27 drives scraper blade 295 to rotate, scraping the slurry or sludge deposited at the bottom of sedimentation tank 2, loosening it and facilitating its discharge. During the rotation of the scraping mechanism, driven by auxiliary plate 291, the fixed cylinder 292, spring 293, and connecting rod 294 work together to buffer the resistance of scraper blade 295 when scraping the slurry or sludge, allowing scraper blade 295 to move smoothly and continuously, thereby effectively scraping and loosening the slurry or sludge. This allows more impurities to be discharged promptly through sewage outlet 24, leaving sufficient space for the effective sedimentation of impurity particles carried in the absorption liquid. A sliding seal structure is provided between fixed cylinder 292 and connecting rod 294, which is a conventional arrangement in the art and is not specifically limited here.

[0033] like Figure 4 Preferably, each scraper blade 295 is arc-shaped and convex toward the side away from the forward direction. The arc-shaped scraper blade 295 is also designed to cushion the slurry or silt on the front side of the rotation direction during the rotation and scraping process, thereby effectively scraping the mud while extending the service life of the scraper blade 295 and saving the cost of repairing and replacing the scraper blade 295.

[0034] Preferably, a plurality of openings are provided on the lower side of each scraper 295 , and a guide plate 296 is fixed to each opening. The guide plate 296 is provided on the back side of the scraper 295 in the forward direction.

[0035] Preferably, the guide plate 296 is L-shaped or arc-shaped, and the openings between the guide plate 296 and the scraper plate 295 are both oriented toward the rotation axis 27 located at the center of the sedimentation tank 2. The openings and guide plate 296 provided on the scraper plate 295 are also intended to reduce the resistance experienced by the scraper plate 295 during rotation. The presence of the guide plate 296 can direct the slurry or sludge at the openings of the guide plate 296 and the scraper plate 295 toward the rotation axis 27, that is, toward the sewage outlet 24, thereby improving sewage discharge efficiency and effectiveness, thereby enabling the space at the bottom of the sedimentation tank 2 to be emptied more quickly, thereby effectively settling impurity particles and the like carried in the absorption liquid.

[0036] In the dual-alkali desulfurization device of the present invention, flue gas enters absorption tower 1 through flue gas inlet pipe 5 connected to the middle of absorption tower 1. It is pumped by circulating pump 6 at the bottom of absorption tower 1 to contact the absorption liquid-sodium alkali in the spray component. Sodium alkali can also be added to absorption tower 1 through absorption liquid inlet pipe 7 for circulation. The sodium alkali reacts with sulfur dioxide and other substances in the flue gas, converting them into water-soluble sulfide salts, which are ultimately collected at the bottom of absorption tower 1. The desulfurized flue gas is then sent through the top of absorption tower 1 to the desulfurization flue gas treatment unit for treatment and discharge.

[0037] When the sulfide content collected in the absorption liquid at the bottom of the absorption tower 1 is high, the absorption liquid at the bottom of the tower is sent to the sedimentation tank 2 through the drainage pump 4 and the sewage inlet 21. After the absorption liquid performs initial precipitation on impurities such as dust and solid particles entrained in the flue gas in the sedimentation tank 2, it is further filtered upward through the filter 23 for secondary filtration to remove impurities, and then discharged into the regeneration tank 3 from the clean water outlet 22 at the upper part of the sedimentation tank 2. The absorption liquid after impurity removal reacts with the calcium alkali from the calcium alkali inlet pipe 8 in the regeneration tank 3 to generate precipitates such as calcium sulfite and calcium sulfate. The sodium alkali formed by regeneration is returned to the absorption tower 1 through the circulating liquid inlet 9 for recycling.

[0038] During long-term filtering work, dirt will inevitably form on the filter screen 23. In order to avoid the problem of scaling of the filter screen 23 affecting the filtering efficiency, the motor 26 on the support plate 25 drives the rotating shaft 27 to rotate, thereby driving the sleeve 281 mounted on the rotating shaft 27 to rotate, and then driving the first brush 282 and the second brush 283 to rotate. During the rotation process, the bristles of the first brush 282 and the second brush 283 are clamped on both sides of the filter screen 23, and the upper and lower sides of the filter screen 23 are brushed and cleaned, which can clean the dirt deposited on the upper and lower sides of the filter screen 23 and the mesh, thereby restoring the filtering effect of the filter screen 23.

[0039] Similarly, during long-term operation of the sedimentation tank 2, a large amount of impurities such as dust and solid particles will accumulate at the bottom of the sedimentation tank 2. The slurry or sludge formed by these impurities needs to be regularly removed through the sewage outlet 24. During sewage discharge, the scraper 295 is rotated by the rotating shaft 27, and is also driven by the auxiliary plate 291. The fixed cylinder 292, the spring 293 and the connecting rod 294 cooperate to buffer the resistance of the scraper 295 when scraping the slurry or sludge, so that the scraper 295 can move smoothly and continuously, thereby better scraping and loosening the slurry or sludge. The guide plate 296 on it can guide the slurry or sludge at the opening between the guide plate 296 and the scraper 295 to the rotating shaft 27, that is, to the sewage outlet 24, thereby improving sewage discharge efficiency and effect, allowing more impurities to be discharged through the sewage outlet 24 in a timely manner, and thus leaving sufficient space for the effective precipitation of impurity particles and the like carried in the absorption liquid.

[0040] It should be noted that in the present application, the detailed structure of part of the equipment is not described in detail, but it is the prior art known to those skilled in the art, so it will not be described here. In addition, the parts not involved in the device are the same as the prior art or can be realized by using the prior art.

[0041] It should be noted that the conveying pipeline inside the device is provided with pressure sensors, flow meters or temperature sensors between different units and equipment, and is also provided with different valves, such as pressure relief valves, pressure regulating valves, safety valves and the like for adjusting and stabilizing the pressure of the whole device. The opening of the valve can also be adjusted to adjust the material flow in the pipeline.

[0042] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that; it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A double alkali desulfurization device, characterized in that: include: An absorption tower, a sedimentation tank, and a regeneration tank are connected in sequence; the bottom of the absorption tower is connected to the sewage inlet at the bottom of the sedimentation tank via a drainage pump, and the clean water outlet at the top of the sedimentation tank is connected to the regeneration tank; a flue gas inlet pipe is connected to the middle of the absorption tower, the top of the absorption tower is connected to a desulfurization flue gas treatment unit, the bottom of the absorption tower is also connected to the spray component at the top of the absorption tower via a circulation pump, and the bottom of the absorption tower is also connected to an absorption liquid inlet pipe; the regeneration tank is also connected to a calcium alkali inlet pipe, and the sodium alkali outlet of the regeneration tank is connected to the circulating liquid inlet at the bottom of the absorption tower; A filter screen is provided between the sewage inlet and the clean water outlet of the sedimentation tank, a sewage outlet is opened at the center position of the bottom of the sedimentation tank, and a screen cleaning mechanism is provided at the bottom of the filter screen; a support plate is installed on the top of the sedimentation tank, a motor is installed on the support plate, and the output end of the motor is connected to a rotating shaft extending to the bottom of the sedimentation tank; the screen cleaning mechanism includes a sleeve mounted on the outside of the rotating shaft, and one end of a first brush is fixed to the sleeve, and the bristles of the first brush are arranged upward and abut against the bottom of the filter screen.

2. The dual alkali desulfurization device according to claim 1, characterized in that: The screen cleaning mechanism further includes a second brush, one end of which is fixedly connected to the sleeve, and the bristles of the second brush are arranged downward and abut against the top of the filter screen.

3. The dual alkali desulfurization device according to claim 2, characterized in that: The sedimentation tank is a cylindrical structure; the rotating shaft is arranged at the center of the sedimentation tank, and the rotating shaft passes through the filter screen.

4. The dual alkali desulfurization device according to claim 2, characterized in that: The filter screen is formed by splicing two symmetrical semicircular arc filter screens.

5. The dual alkali desulfurization device according to any one of claims 1 to 4, characterized in that: A scraping mechanism is provided at the bottom of the sedimentation tank, and the scraping mechanism includes auxiliary plates symmetrically fixedly connected to both sides of the rotating shaft, two fixed cylinders are symmetrically provided on each of the auxiliary plates, a spring is installed inside each of the fixed cylinders, and a connecting rod is also slidably connected in each of the fixed cylinders, and the two ends of the spring are respectively connected to the top wall of the fixed cylinder and the top of the connecting rod; the same scraping plate is connected to the bottom of the two connecting rods connected to the same auxiliary plate, and the bottom of the scraping plate abuts against the bottom surface of the sedimentation tank.

6. The dual alkali desulfurization device according to claim 5, characterized in that: Each of the scraper blades is arc-shaped and bulges toward a side away from the forward direction.

7. The dual alkali desulfurization device according to claim 5, characterized in that: A plurality of openings are provided on the lower side of each of the scrapers, and a guide plate is fixedly connected to each of the openings. The guide plate is arranged on the back side of the forward direction of the scraper.

8. The dual alkali desulfurization device according to claim 7, characterized in that: The guide plate is L-shaped or arc-shaped, and the openings between the guide plate and the scraper are both oriented toward the rotating shaft located at the center of the sedimentation tank.

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