Desulfurization tower with hierarchical purification function

Abstract

The application relates to the technical field of desulfurization towers, and particularly discloses a desulfurization tower with a hierarchical purification function, which comprises a tower body, a flue gas input pipe arranged at the bottom of the tower body, a spraying mechanism comprising a pump body, a spraying pipe and a spray head, the input end of the pump body being in communication with the bottom of the tower body, the output end of the pump body being in communication with the spraying pipe, and the spray head being arranged on the spraying pipe, and a center pipe made of a heat-conducting material, the top end of the center pipe being in communication with the top of the tower body, and the bottom of the center pipe extending to the outside of the tower body, so that the flue gas input by the flue gas input pipe flows into the tower body, flows to the top end of the tower body, is subjected to sulfur removal treatment by spraying, flows into the center pipe, and is discharged through the bottom end of the center pipe. The application can make the low-temperature flue gas subjected to desulfurization treatment flow into the center pipe, the low-temperature flue gas in the center pipe exchanges heat with the high-temperature flue gas in the tower body, the cooling rate of the flue gas in the tower body can be accelerated, the solubility of sulfur dioxide is improved, and the sulfur removal effect is enhanced.

Description

Technical Field

[0001] This application relates to the field of desulfurization tower technology, and in particular to a desulfurization tower with a staged purification function. Background Technology

[0002] A desulfurization tower is a tower-type device used to treat industrial waste gas, primarily removing sulfur dioxide from flue gas. Currently, most desulfurization methods are wet desulfurization, using limestone slurry as a sulfiding agent. After reacting with sulfur dioxide in the flue gas, the slurry is further oxidized to form calcium sulfate precipitate, which is then output. Typically, a spray system is installed at the top of the desulfurization tower to allow the sulfiding agent to come into contact with the flue gas and react.

[0003] The initial temperature of the flue gas flowing into the desulfurization tower is relatively high, typically 120-160℃. Since the solubility of sulfur dioxide decreases with increasing temperature, the sprayed low-temperature slurry (usually 20-30℃) comes into contact with the high-temperature flue gas, lowering the flue gas temperature through heat transfer and moisture evaporation, creating suitable reaction conditions. However, the cooling effect of spraying is limited, especially since the flue gas temperature near the bottom of the tower remains high. The solubility of sulfur dioxide in this portion of the flue gas is low, which is detrimental to improving desulfurization efficiency. Therefore, a desulfurization tower that can further improve desulfurization efficiency is needed. Summary of the Invention

[0004] To further improve desulfurization efficiency, this application provides a desulfurization tower with a staged purification function.

[0005] The desulfurization tower with graded purification function provided in this application adopts the following technical solution:

[0006] A desulfurization tower with a graded purification function includes a tower body, and a flue gas inlet pipe is provided at the bottom of the tower body;

[0007] The spraying mechanism includes a pump body, spray pipes and nozzles. The input end of the pump body is connected to the bottom of the tower body, and the output end of the pump body is connected to the spray pipes. Multiple spray pipes are provided and arranged at intervals along the height direction of the tower body. The nozzles are provided on the spray pipes.

[0008] The central tube, made of a heat-conducting material, is installed in the tower body along the height direction. The top of the central tube is connected to the top of the tower body, and the bottom of the central tube extends to the outside of the tower body, so that the flue gas input from the flue gas inlet pipe flows into the tower body and then flows to the top of the tower body. After being treated by spray desulfurization, it flows into the central tube and is then discharged through the bottom of the central tube.

[0009] By adopting the above technical solution, the flue gas temperature is relatively high when it first enters the tower, at 120-160℃. When the high-temperature flue gas inside the tower comes into contact with the sprayed atomized slurry, the slurry evaporates, thus consuming the heat in the flue gas. After multiple spray desulfurization treatments, the flue gas temperature can drop to 50-55℃. At this point, the low-temperature flue gas flows from the top of the tower into the central pipe and then flows downwards. The low-temperature flue gas in the central pipe can exchange heat with the high-temperature flue gas inside the tower, thereby removing some of the heat from the flue gas inside the tower and accelerating the cooling rate of the flue gas inside the tower. This rapidly increases the solubility of sulfur dioxide, helping to ensure desulfurization efficiency. Because it is... The flue gas after desulfurization is fully utilized, and no other cold source is set up for cooling the flue gas in the tower, which helps to reduce energy consumption. Furthermore, due to the limitation of the water evaporation limit, the saturation temperature limit of spray cooling is 50-55℃. Therefore, during the heat exchange process between the low-temperature flue gas in the central pipe and the high-temperature flue gas in the tower, the temperature of the flue gas in the tower will only drop rapidly, and the temperature will not drop below 50℃. The saturation temperature range (50-55℃) is exactly the optimal temperature window for the desulfurization reaction, which helps to ensure the desulfurization effect and will not cause acid dew point corrosion or condensation on the surface of the demisting equipment due to excessively low temperature, thus affecting the demisting effect.

[0010] Optionally, the tower body is provided with a partitioning mechanism, which includes a fixed disk, a rotating disk, and a driving assembly. The fixed disk and the rotating disk are coaxially sleeved on the outside of the central tube. The fixed disk is located on the side of the rotating disk near the top of the tower body. The fixed disk is fixedly connected to the inner wall of the tower body. The rotating disk can rotate relative to the fixed disk. Both the fixed disk and the rotating disk have notches. There are multiple notches arranged in a circumferential array. The driving assembly is used to drive the rotating disk to rotate.

[0011] By adopting the above technical solution, the rotating disk divides the interior of the tower into multiple reaction chambers. During operation, the rotating disk rotates continuously. When the notches on the fixed disk and the rotating disk are fully aligned, all reaction chambers are connected, allowing the flue gas to flow continuously upwards and be discharged through the central pipe after desulfurization. When the notches on the fixed disk and the rotating disk are staggered, each reaction chamber is closed, allowing the flue gas in each chamber to remain for a period of time. This prolongs the heat exchange time between the high-temperature flue gas in the tower and the low-temperature flue gas in the central pipe, thereby enhancing the cooling effect on the high-temperature flue gas in the tower. During the time the flue gas remains inside the reaction chamber, the nozzles spray continuously, further extending the reaction time between the flue gas and the slurry, thus enhancing the desulfurization effect.

[0012] Optionally, multiple notches are provided along the radial direction of the fixed disk or rotating disk.

[0013] By adopting the above technical solution, the connection area between each reaction chamber can be increased, which helps the rapid flow of flue gas and thus ensures the efficiency of flue gas treatment.

[0014] Optionally, the central tube is rotatably connected to the tower body around its own axis, and the rotating disk is coaxially fixedly connected to the outer wall of the central tube. The driving assembly includes a motor, a driving gear, and a driven gear ring. The motor is fixedly mounted on the tower body, and the output shaft of the motor is coaxially connected to the driving gear. The driven gear ring is coaxially mounted on the outside of the central tube, and the driving gear meshes with the driven gear ring.

[0015] By adopting the above technical solution, the motor drives the active gear to rotate, the active gear drives the driven gear ring to rotate, the driven gear ring drives the central tube to rotate, and the central tube drives the rotating disk to rotate, thereby realizing the drive of the rotating disk. The structure is simple, stable and reliable.

[0016] Optionally, both the fixed disk and the rotating disk are made of heat-conducting material, and both the fixed disk and the rotating disk have accommodating cavities inside. The accommodating cavities inside the fixed disk and the rotating disk are connected to each other, so that some of the flue gas in the central pipe can first flow into the accommodating cavities inside the fixed disk and the rotating disk, and then flow out into the central pipe.

[0017] By adopting the above technical solution, some of the flue gas in the central tube can flow into the receiving cavity inside the fixed plate and the rotating plate, and then flow out into the central tube. Since the fixed plate and the rotating plate have a large surface area and strong thermal conductivity, they can absorb the heat in the flue gas and then transfer the heat to the low-temperature flue gas in the receiving cavity. The low-temperature flue gas in the receiving cavity is then discharged into the central tube to carry away the heat, thus helping to further improve the cooling efficiency of the flue gas inside the tower.

[0018] Optionally, both the fixed disk and the rotating disk are provided with cleaning components. The cleaning component on the fixed disk includes a push block and a spring. The push block is slidably connected to the side of the fixed disk near the rotating disk. The spring is connected between the push block and the fixed disk. The spring is used to drive the push block to slide into the notch on the rotating disk. The push block is provided with an inclined surface so that when relative sliding occurs between the push block and the rotating disk, the push block slides out from the notch on the rotating disk.

[0019] By adopting the above technical solution, when the notches on the fixed disk and the rotating disk are fully aligned, the push block on the fixed disk and the notch on the rotating disk are misaligned, so the setting of the push block will not affect the smooth flow of gas; when the notches on the fixed disk and the rotating disk are misaligned, the push block on the fixed disk slides into the notch on the rotating disk under the action of the spring, thereby pushing out the debris in the notch on the rotating disk, which can prevent the notch on the rotating disk from becoming blocked; similarly, the cleaning component on the rotating disk can clean the notch on the fixed disk, preventing the notch on the fixed disk from becoming blocked.

[0020] Optionally, a scraper is fixedly connected to the fixed plate, the scraper is arranged along the axial direction of the central tube, and one end of the scraper abuts against the outer wall of the central tube.

[0021] By adopting the above technical solution, the scraper and the fixed plate are in a stationary state, while the central tube is in a rotating state. Therefore, relative movement can occur between the scraper and the central tube, thereby scraping off the slurry adhering to the outer wall of the central tube by the scraper, which can achieve cleaning of the outer wall of the central tube and help ensure the heat exchange efficiency of the central tube.

[0022] Optionally, a stirring rod is provided at the bottom end of the central tube.

[0023] By adopting the above technical solution, the rotation of the central tube drives the stirring rod to rotate, and the stirring rod can stir the slurry at the bottom of the tower, so that the air introduced into the slurry can be fully mixed with the slurry, thereby better oxidizing the calcium sulfite in the slurry into calcium sulfate, thus continuously promoting the desulfurization reaction.

[0024] Optionally, a discharge port is provided on the side wall of the tower body above the fixed plate.

[0025] By adopting the above technical solution, the slurry above the fixed plate can be discharged through the discharge port, avoiding excessive accumulation of slurry on the fixed plate, thereby ensuring the unobstructed flow of the gaps on the fixed plate and the rotating plate, so that the flue gas in the flue gas tower can flow upward smoothly.

[0026] Optionally, a demister is provided inside the tower body at the top of the central pipe, and the spray pipes are all located on the side of the demister near the bottom of the tower body.

[0027] By adopting the above technical solutions, the demister can remove droplets from the flue gas, preventing the droplets from causing acidic corrosion to subsequent components; it can also prevent the droplets from condensing and falling due to the decrease in temperature after being discharged with the flue gas, thus avoiding the formation of gypsum rain and adverse environmental impact.

[0028] In summary, this application includes the following beneficial technical effects:

[0029] 1. When the flue gas in the tower comes into contact with the slurry, the slurry evaporates, thus reducing the temperature of the flue gas during the desulfurization process. The desulfurized flue gas flows into the central pipe, where the low-temperature flue gas can exchange heat with the high-temperature flue gas in the tower, further accelerating the cooling rate of the flue gas in the tower, thereby rapidly increasing the solubility of sulfur dioxide and enhancing the desulfurization effect.

[0030] 2. When the notches on the fixed plate and the rotating plate are staggered, the flue gas will stay in the area between the two rotating plates for a period of time, thereby prolonging the heat exchange time between the high-temperature flue gas in the tower and the low-temperature flue gas in the central tube, which helps to further enhance the cooling rate of the high-temperature flue gas in the tower; it can also prolong the contact time between the flue gas and the slurry in the tower, thereby enhancing the desulfurization effect.

[0031] 3. Low-temperature flue gas can circulate in the accommodating cavities inside the fixed and rotating discs, and the heat from the high-temperature flue gas in the tower body can be transferred to the low-temperature flue gas in the accommodating cavities, thereby further enhancing the cooling effect on the high-temperature flue gas in the tower body.

[0032] 4. When the rotating disk and the fixed disk rotate relative to each other, the pusher on the fixed disk can intermittently insert into the notch on the rotating disk and then slide out of the notch, thereby cleaning the notch on the rotating disk and preventing the notch on the rotating disk from becoming blocked, thus ensuring that the flue gas in the tower can flow upward smoothly. Attached Figure Description

[0033] Figure 1 This is a cross-sectional view of an embodiment of this application;

[0034] Figure 2 This is a cross-sectional view of the sprinkler pipe used in an embodiment of this application;

[0035] Figure 3 yes Figure 1 Enlarged view of point A in the middle;

[0036] Figure 4 This is a top view of the fixed disk in an embodiment of this application;

[0037] Figure 5 This is a bottom view of the fixed disk in an embodiment of this application;

[0038] Figure 6 This is a top view of the embodiment of this application with the tower body hidden;

[0039] Figure 7 yes Figure 6 A cross-sectional view along the aa direction;

[0040] Figure 8 yes Figure 6 A cross-sectional view along the bb direction;

[0041] Figure 9 yes Figure 6 The cross-sectional view along the cc direction is intended to show a structural schematic diagram of the notches on the fixed disk and the rotating disk being aligned.

[0042] Figure 10 yes Figure 6 The cross-sectional view along the cc direction is intended to show a structural schematic diagram of the notches on the fixed disk and the rotating disk being staggered.

[0043] Reference numerals: 1. Tower body; 11. Flue gas inlet pipe; 12. Reaction chamber; 13. Discharge port; 2. Spraying mechanism; 21. Pump body; 22. Spray pipe; 221. Annular pipe; 222. Branch pipe; 23. Nozzle; 3. Central pipe; 31. Air inlet; 32. Exhaust outlet; 4. Separating mechanism; 41. Fixed plate; 411. Connecting ring; 412. Slide groove; 42. Rotating plate; 421. Mounting groove; 43. Drive assembly; 431. Motor; 432. Drive gear; 433. Driven gear ring; 5. Receiving chamber; 6. Notch; 7. Cleaning assembly; 71. Push block; 72. Spring; 8. Scraper; 9. Stirring rod; 10. Demisting component. Detailed Implementation

[0044] The following combination Figures 1-10 This application will be described in further detail.

[0045] This application discloses a desulfurization tower with a staged purification function. (Refer to...) Figure 1 The desulfurization tower with graded purification function includes a tower body 1, a spraying mechanism 2, and a central pipe 3. The tower body 1 is vertically oriented, and a flue gas inlet pipe 11 is fixedly connected to the bottom of the tower body 1 to transport high-temperature flue gas into the tower body 1. The spraying mechanism 2 sprays atomized limestone slurry downwards. Sulfur dioxide in the flue gas first dissolves in the limestone slurry to form sulfurous acid; the sulfurous acid then reacts with calcium carbonate in the slurry to form calcium sulfite. An air inlet pipe is installed at the bottom of the tower body 1, and a Roots blower is connected to the end of the air inlet pipe. The Roots blower can deliver compressed air to the slurry pool at the bottom of the tower body 1 through the air inlet pipe, so that the calcium sulfite in the slurry pool reacts with oxygen to form calcium sulfate. The oxidation reaction can maintain the chemical balance of the slurry and promote the dissolution of limestone and the absorption of sulfur dioxide. A discharge pipe is also installed at the bottom of the tower body 1, and a valve is installed at the end of the discharge pipe. Opening the valve facilitates the discharge of slurry from the tower body 1.

[0046] Inside the tower body 1, at the top of the central tube 3, is a demister 10. The demister 10 is a baffle plate type demister. When the flue gas passes through the tortuous flow channel, the droplets are captured by impacting the plate wall due to inertia. After the droplets accumulate, they fall along the plate surface and return to the slurry pool at the bottom of the tower body 1. The demister 10 can remove the droplets in the flue gas, preventing the droplets mixed in with the discharged flue gas from condensing and falling due to the decrease in temperature, thus forming gypsum rain.

[0047] Reference Figure 2 The spraying mechanism 2 includes a pump body 21, spray pipes 22, and nozzles 23. The pump body 21 is located on the outside of the tower body 1, and the spray pipes 22 are located inside the tower body 1, below the demister 10. Multiple sets of spray pipes 22 are arranged at intervals along the vertical direction. Each spray pipe 22 includes an annular pipe 221 and branch pipes 222. The annular pipe 221 is circular and coaxial with the tower body 1, and is fixedly connected to the inner wall of the tower body 1. The branch pipes 222 are straight and horizontally arranged. Multiple branch pipes 222 are arranged parallel at intervals, located inside the annular pipe 221. Both ends of the branch pipe 222 are fixedly connected to and communicate with the interior of the annular pipe 221. The nozzles 23 are fixedly connected to the bottom end of the branch pipes 222 and communicate with the interior of the branch pipes 222. The input end of the pump body 21 is connected to the bottom of the tower body 1, and the output end of the pump body 21 is connected to the inside of the annular pipe 221. Therefore, the pump body 21 can transport the slurry at the bottom of the tower body 1 to the annular pipe 221. The slurry in the annular pipe 221 flows into the branch pipe 222 and then is sprayed downward through the nozzle 23. The downward sprayed limestone slurry comes into contact with the rising sulfur-containing high-temperature flue gas, so that the sulfur dioxide in the flue gas reacts with the limestone slurry, thereby removing the sulfur dioxide in the flue gas.

[0048] Since multiple sets of spray pipes 22 are arranged vertically, and the branch pipes 222 in adjacent sets of spray pipes 22 are staggered, it helps to increase the coverage of the sprayed slurry, thereby enhancing the desulfurization effect on flue gas.

[0049] The central tube 3 is made of copper alloy; in other embodiments, other materials with high thermal conductivity may also be used. The central tube 3 is coaxially arranged inside the tower body 1, with its top end connected to the top of the tower body 1 and located above the demister 10. The bottom end of the central tube 3 extends to the outside of the tower body 1. Therefore, the flue gas flowing into the tower body 1 through the flue gas inlet pipe 11 will first rise inside the tower body 1 and react with the slurry sprayed from the nozzle 23 to complete the desulfurization treatment. Then, the desulfurized flue gas flows into the interior of the central tube 3 from its top end, then flows downward along the central tube 3, and finally exits from the bottom end of the central tube 3 to complete the flue gas discharge.

[0050] The flue gas flowing in through the flue gas inlet pipe 11 has a temperature of 120-160℃, which is relatively high. During the desulfurization process, when the high-temperature flue gas (120-160℃) comes into contact with the slurry, the slurry will evaporate, thus lowering the temperature of the flue gas. After the desulfurization process is completed, the temperature of the flue gas is 50-55℃. Therefore, the flue gas flowing in the central pipe 3 can exchange heat with the flue gas inside the tower body 1, which lowers the temperature of the flue gas that just enters the tower body 1, thereby increasing the solubility of sulfur dioxide in the flue gas and thus improving the desulfurization efficiency.

[0051] Reference Figure 1 and Figure 3 The tower body 1 is also equipped with a partitioning mechanism 4, which includes a fixed disk 41, a rotating disk 42, and a drive assembly 43. Multiple fixed disks 41 and rotating disks 42 are provided, and the number of fixed disks 41 and rotating disks 42 is the same, with each fixed disk 41 corresponding to one rotating disk 42. The fixed disks 41 and rotating disks 42 divide the interior of the tower body 1 into multiple reaction chambers 12. Both the fixed disks 41 and rotating disks 42 are circular disks, coaxially sleeved on the outside of the central tube 3. The outer diameter of both the fixed disks 41 and rotating disks 42 is the same as the inner diameter of the tower body 1, and the inner diameter of both the fixed disks 41 and rotating disks 42 is the same as the outer diameter of the central tube 3. The fixed disk 41 is located above the rotating disk 42 and is fixedly connected to the inner wall of the tower body 1, allowing the rotating disk 42 to rotate relative to the inner wall of the tower body 1.

[0052] Reference Figure 4 and Figure 5 Both the fixed disk 41 and the rotating disk 42 have notches 6, which are arranged in a circular array. Multiple notches 6 are spaced radially along the fixed disk 41 or the rotating disk 42. The number and arrangement of notches 6 on the fixed disk 41 and the rotating disk 42 are the same, thus ensuring that the notches 6 on the fixed disk 41 and the rotating disk 42 are perfectly aligned. The drive assembly 43 is disposed in the tower body 1 and is used to drive the rotating disk 42 to rotate.

[0053] During operation, the fixed disk 41 remains stationary, while the rotating disk 42 rotates continuously. When the notches 6 on the fixed disk 41 and the rotating disk 42 are fully aligned, they are connected, allowing the flue gas below the rotating disk 42 to flow upwards through the notches 6. As the rotating disk 42 rotates, the notches 6 on the fixed disk 41 and the rotating disk 42 become staggered, reducing the area of ​​connection between them until they are completely misaligned. This results in the multiple reaction chambers 12 inside the tower body 1 being closed, allowing the flue gas in each reaction chamber 12 to remain for a period of time. Simultaneously, the nozzles 23 on the spray pipes 22 in each reaction chamber 12 continuously spray, thus extending the cooling and desulfurization time of the flue gas and improving desulfurization efficiency. As the rotating disk 42 continues to rotate, the notch 6 on the fixed disk 41 and the rotating disk 42 reconnects, allowing the flue gas to continue rising. Finally, the flue gas is discharged outward through the central pipe 3 after undergoing desulfurization treatment in multiple reaction chambers 12.

[0054] Each fixed plate 41 is provided with a discharge port 13 on the side wall of the tower body 1. The end of the discharge port 13 is connected to a branch pipe, and the end of the branch pipe is connected to a collection box to facilitate the collection of the discharged slurry. This facilitates the discharge of slurry above the fixed plate 41 and avoids the continuous accumulation of slurry above the fixed plate 41.

[0055] Reference Figure 2 The central tube 3 is rotatably connected to the inside of the tower body 1 around its own axis, and the rotating disk 42 is coaxially fixedly connected to the outer wall of the central tube 3. The drive assembly 43 includes a motor 431, a driving gear 432, and a driven gear ring 433. The motor 431 is fixedly connected to the bottom wall of the tower body 1, and the output shaft of the motor 431 faces vertically downward. The driving gear 432 is coaxially fixedly connected to the output shaft of the motor 431, and the driven gear ring 433 is coaxially fixedly connected to the outer wall of the bottom end of the central tube 3, meshing with the driving gear 432. Therefore, after the motor 431 starts, it can drive the driving gear 432 to rotate, the driving gear 432 drives the driven gear ring 433 to rotate, the driven gear ring 433 drives the central tube 3 to rotate, and the central tube 3 drives the rotating disk 42 to rotate, thereby realizing the drive of the rotating disk 42.

[0056] Reference Figure 3Furthermore, to enhance the cooling effect on the flue gas and increase the solubility of sulfur dioxide in the flue gas in the slurry, both the fixed disk 41 and the rotating disk 42 are made of a material with high thermal conductivity, such as copper alloy. In other embodiments, other thermally conductive materials may also be used. Both the fixed disk 41 and the rotating disk 42 have internal cavities 5 for accommodating the flue gas. Multiple air inlets 31 are arranged in a circular array on the side wall of the central tube 3. The air inlets 31 are at the same height as the fixed disk 41 and communicate with the internal cavity 5 of the fixed disk 41. Multiple exhaust holes 32 are also provided on the side wall of the central tube 3, arranged in a circular array. The exhaust holes 32 are at the same height as the rotating disk 42 and communicate with the internal cavity 5 of the rotating disk 42. A connecting ring 411 is coaxially fixed at the bottom end of the fixed disk 41. The connecting ring 411 is circular and open at the bottom end. A circular mounting groove 421 is coaxially formed on the top wall of the rotating disk 42. The mounting groove 421 communicates with the receiving cavity 5 inside the rotating disk 42. The connecting ring 411 is inserted into the mounting groove 421 and rotatably connected to the inner wall of the mounting groove 421, so that the receiving cavity 5 inside the fixed disk 41 and the receiving cavity 5 inside the rotating disk 42 are in a state of mutual communication.

[0057] Therefore, when the flue gas in the central tube 3 flows downward, a portion of the flue gas will flow into the receiving cavity 5 inside the fixed plate 41 through the air inlet 31. Then, the flue gas in the receiving cavity 5 inside the fixed plate 41 flows into the receiving cavity 5 inside the rotating plate 42 through the connecting ring 411. Then, the flue gas in the receiving cavity 5 inside the rotating plate 42 flows out back into the central tube 3. That is, the receiving cavities 5 inside the fixed plate 41 and the rotating plate 42 continuously carry low-temperature flue gas after desulfurization treatment. The high-temperature flue gas in the tower body 1 outside the central tube 3 can transfer heat to the fixed plate 41 and the rotating plate 42. The low-temperature flue gas inside the fixed plate 41 and the rotating plate 42 then carries away this part of the heat, thereby further enhancing the cooling effect on the flue gas that has just entered the tower body 1, which can increase the solubility of sulfur dioxide and thus improve the desulfurization efficiency.

[0058] Furthermore, a first guide tube is fixedly installed on the inner wall of the central tube 3 at the end of the air inlet 31. The first guide tube is L-shaped, with one end horizontally connected to the air inlet 31 and the other end vertically with its opening facing upwards. A second guide tube is fixedly installed on the inner wall of the central tube 3 at the end of the exhaust port 32. The second guide tube is L-shaped, with one end horizontally connected to the exhaust port 32 and the other end vertically with its opening facing downwards. This design guides the flow of flue gas, allowing the low-temperature flue gas in the central tube 3 to flow more effectively in a unidirectional direction from the fixed disk 41 to the rotating disk 42.

[0059] Reference Figure 6 , Figure 7 and Figure 8 Cleaning components 7 are provided on the fixed disk 41 and the rotating disk 42. Taking the cleaning component 7 on the fixed disk 41 as an example, the cleaning component 7 includes push blocks 71 and springs 72. A vertical groove 412 is formed on the bottom wall of the fixed disk 41. Multiple grooves 412 are arranged in a circumferential array. The grooves 412 are not connected to the receiving cavity 5 inside the fixed disk 41. The number of push blocks 71 is the same as the number of grooves 412, and each push block 71 corresponds to one groove 412. The push blocks 71 are vertically slidably connected in the grooves 412, and the height of the push blocks 71 is less than the depth of the grooves 412, so that the push blocks 71 can slide completely into the grooves 412. Multiple springs 72 are provided, and each spring 72 corresponds to one push block 71. The springs 72 are fixedly connected between the top wall of the push block 71 and the bottom wall of the groove 412. The springs 72 are in a compressed state, causing the push blocks 71 to tend to slide to the outside of the grooves 412. Both ends of the push block 71 are provided with inclined surfaces for abutting against the end sidewall of the notch 6 on the rotating disk 42.

[0060] Reference Figure 9 When the notches 6 on the fixed disk 41 and the rotating disk 42 are aligned, the push block 71 is located in the slide groove 412, and the push block 71 and the notches 6 are misaligned. (Refer to...) Figure 10 As the rotating disk 42 rotates, when the notch 6 on the fixed disk 41 and the notch 6 on the rotating disk 42 are completely misaligned, the spring 72 can drive the bottom end of the push block 71 to insert into the notch 6 on the rotating disk 42. At this time, the push block 71 can push out the debris in the notch 6 on the rotating disk 42, thereby preventing the notch 6 on the rotating disk 42 from being blocked. Then, as the rotating disk 42 rotates, the inclined surface at the end of the push block 71 abuts against the side wall at the end of the notch 6, allowing the push block 71 to slide upward and slide out of the notch 6 on the rotating disk 42, thereby realizing the reset process of the push block 71.

[0061] The cleaning component 7 on the fixed disk 41 is used to clean the notch 6 on the rotating disk 42. Similarly, the cleaning component 7 on the rotating disk 42 is used to clean the notch 6 on the fixed disk 41, thereby preventing the notch 6 on the fixed disk 41 from becoming blocked. The cleaning component 7 on the rotating disk 42 has the same structure as the cleaning component 7 on the fixed disk 41, and also includes a push block 71 and a spring 72. The working principle is the same, so it will not be described in detail here.

[0062] Reference Figure 2A scraper 8 is also fixedly connected to the top wall of the fixed plate 41. The scraper 8 is arranged vertically, and there are two scrapers 8 arranged symmetrically. One end of the scraper 8 abuts against the inner wall of the central tube 3. Therefore, when the central tube 3 rotates, the scraper 8 can move relative to the central tube 3, thereby scraping off the slurry adhering to the outer wall of the central tube 3, thus cleaning the outer wall of the central tube 3; this ensures the heat exchange efficiency between the low-temperature flue gas in the central tube 3 and the high-temperature flue gas in the tower body 1.

[0063] A stirring rod 9 is also vertically fixed to the bottom end of the central tube 3. The stirring rod 9 is located inside the tower body 1. Therefore, when the central tube 3 rotates, it can drive the stirring rod 9 to rotate, thereby stirring the slurry at the bottom of the tower body 1, so that the slurry can come into more full contact with oxygen in the air and improve the oxidation efficiency of calcium sulfite in the slurry.

[0064] The implementation principle of a desulfurization tower with a graded purification function in this application embodiment is as follows: High-temperature flue gas containing sulfur dioxide flows into the bottom of the tower body 1 through the flue gas inlet pipe 11, and the flue gas flows upward inside the tower body 1; the nozzles 23 on the spray pipe 22 spray atomized limestone slurry downward. When the slurry comes into contact with the flue gas, sulfur dioxide dissolves in the water to form sulfurous acid. The sulfurous acid reacts with the calcium carbonate in the slurry to form calcium sulfite, thereby removing sulfur dioxide from the flue gas. The flue gas after desulfurization flows through the demister 10 for demisting treatment. The demisted flue gas then flows into the central pipe 3 from the top opening of the central pipe 3, and then flows downward along the central pipe 3. Since the slurry evaporates when the high-temperature flue gas comes into contact with it, the temperature of the flue gas after desulfurization is low, that is, the temperature of the flue gas in the central pipe 3 is low. The low-temperature flue gas in the central pipe 3 exchanges heat with the high-temperature flue gas in the tower body 1, thereby further cooling the flue gas in the tower body 1, which can increase the solubility of sulfur dioxide and thus increase the reaction rate.

[0065] During the upward flow of flue gas inside tower 1, the central pipe 3 continuously rotates, driving the rotating disk 42 to rotate. When the notch 6 on the rotating disk 42 is connected to the notch 6 on the fixed disk 41, the reaction chambers 12 between the rotating disks 42 are interconnected, allowing the flue gas to flow into the central pipe 3 after desulfurization. When the notch 6 on the rotating disk 42 is not connected to the notch 6 on the fixed disk 41, the reaction chambers 12 between the rotating disks 42 are separated, causing the flue gas to flow into the reaction chambers 12. During the period when the flue gas remains inside the reaction chamber 12, the nozzles 23 on the spray pipe 22 continuously spray the slurry, thus prolonging the reaction time between the atomized droplets and the flue gas, thereby enhancing the reaction effect. At the same time, the flue gas in the central pipe 3 can also flow into the receiving cavity 5 inside the fixed disk 41 and the rotating disk 42. The fixed disk 41 and the rotating disk 42 have high thermal conductivity, thus they can remove some of the heat from the flue gas, thereby further enhancing the cooling effect on the flue gas, increasing the solubility of sulfur dioxide, and thus enhancing the desulfurization effect.

[0066] During the rotation of the rotating disk 42, the push block 71 on the fixed disk 41 can be intermittently inserted into the notch 6 on the rotating disk 42, thereby pushing out the debris in the notch 6 on the rotating disk 42, thus cleaning the notch 6 on the rotating disk 42 and preventing blockage; similarly, the push block 71 on the rotating disk 42 can also be intermittently inserted into the notch 6 on the fixed disk 41, thereby pushing out the debris in the notch 6 on the fixed disk 41, thus cleaning the notch 6 on the fixed disk 41 and preventing blockage.

[0067] The above are optional embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A desulfurization tower having a function of hierarchical purification, characterized by comprising: include: Tower body (1), with a flue gas inlet pipe (11) provided at the bottom of the tower body (1). The spraying mechanism (2) includes a pump body (21), a spray pipe (22) and a nozzle (23). The input end of the pump body (21) is connected to the bottom of the tower body (1), and the output end of the pump body (21) is connected to the spray pipe (22). Multiple spray pipes (22) are provided and arranged at intervals along the height direction of the tower body (1). The nozzle (23) is provided on the spray pipe (22). The central tube (3) is made of heat-conducting material and is set in the tower body (1) along the height direction of the tower body (1). The top of the central tube (3) is connected to the top of the tower body (1), and the bottom of the central tube (3) extends to the outside of the tower body (1) so that the flue gas input by the flue gas input pipe (11) flows into the tower body (1) and then flows to the top of the tower body (1). After being treated by spray desulfurization, it flows into the central tube (3) and is discharged through the bottom of the central tube (3). The tower body (1) is provided with a partition mechanism (4). The partition mechanism (4) includes a fixed disk (41), a rotating disk (42), and a drive assembly (43). The fixed disk (41) and the rotating disk (42) are coaxially sleeved on the outside of the central tube (3). The fixed disk (41) is located on the side of the rotating disk (42) near the top of the tower body (1). The fixed disk (41) is fixedly connected to the inner wall of the tower body (1). The rotating disk (42) can rotate relative to the fixed disk (41). The fixed disk (41) and the rotating disk (42) are provided with notches (6). There are multiple notches (6) arranged in a circular array. The drive assembly (43) is used to drive the rotating disk (42) to rotate. The central tube (3) is rotatably connected to the tower body (1) around its own axis, and the rotating disk (42) is coaxially fixedly connected to the outer wall of the central tube (3); Both the fixed disk (41) and the rotating disk (42) are made of heat-conducting material. Both the fixed disk (41) and the rotating disk (42) have a receiving cavity (5) inside. The receiving cavities (5) inside the fixed disk (41) and the rotating disk (42) are connected to the inside of the central tube (3). The receiving cavities (5) inside the fixed disk (41) and the receiving cavities (5) inside the rotating disk (42) are connected to each other so that some of the flue gas in the central tube (3) can first flow into the receiving cavities (5) inside the fixed disk (41) and the receiving cavities (5) inside the rotating disk (42), and then flow out into the central tube (3). The fixed disc (41) and the rotating disc (42) are provided with cleaning assemblies (7), the cleaning assembly (7) on the fixed disc (41) comprises a push block (71) and a spring (72), the push block (71) is slidingly connected to one side of the fixed disc (41) close to the rotating disc (42), the spring (72) is connected between the push block (71) and the fixed disc (41), the spring (72) is used for driving the push block (71) to slide into the notch (6) on the rotating disc (42), and the push block (71) is provided with an inclined surface, so that when the push block (71) and the rotating disc (42) slide relative to each other, the push block (71) slides out of the notch (6) on the rotating disc (42).

2. The desulfurizing tower with hierarchical purification function according to claim 1, characterized in that: The notch (6) is provided with a plurality of notches along the radial direction of the fixed disc (41) or the rotating disc (42).

3. The desulfurizing tower with hierarchical purification function according to claim 1, characterized in that: The driving assembly (43) comprises a motor (431), a driving gear (432) and a driven gear ring (433), the motor (431) is fixedly arranged on the tower body (1), the output shaft of the motor (431) is coaxially connected with the driving gear (432), and the driven gear ring (433) is coaxially arranged on the outer side of the central pipe (3).

4. The desulfurizing tower with hierarchical purification function according to claim 3, characterized in that: The fixed disc (41) is fixedly connected with a scraper (8), the scraper (8) is arranged along the axis direction of the central pipe (3), and one end of the scraper (8) abuts against the outer wall of the central pipe (3).

5. The desulfurizing tower with hierarchical purification function according to claim 3, characterized in that: The bottom end of the central pipe (3) is provided with a stirring rod (9).

6. The desulfurizing tower with hierarchical purification function according to claim 1, characterized in that: The sidewall of the tower body (1) is provided with a discharge port (13) above the fixed disc (41).

7. The desulfurizing tower with hierarchical purification function according to claim 1, characterized in that: The top end of the central pipe (3) in the tower body (1) is provided with a demisting piece (10), and the spray pipes (22) are located on one side of the demisting piece (10) close to the bottom end of the tower body (1).

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