Tail gas treatment device of urea prilling tower

Abstract

The invention belongs to the technical field of urea prilling towers, and particularly relates to a tail gas treatment device of a urea prilling tower, which is characterized by comprising a treatment main body which comprises a treatment shell, one side of the lower end of the treatment shell is provided with a gas inlet, the upper end of the treatment shell is provided with a gas outlet, and the middle part of the inner side of the treatment shell is fixedly provided with a treatment middle column; the treatment mechanism comprises an electrostatic dust collection unit; the problems needing to be solved in the scheme are that dust removal is not thorough when an existing granulation tower is used for spraying and filtering, secondary pollution risks exist, equipment maintenance is difficult, and organic matter degradation is insufficient. According to the scheme, through the designed treatment mechanism, the rotary cleaning mechanism and the spraying mechanism, through coupling of three mechanisms of electrostatic dust collection (physical), photocatalytic oxidation (chemical) and mechanical cleaning (dynamic), the bottleneck of a single technology is broken through, and electrostatic adsorption is carried out through cooperation of an electrostatic dust collection cathode plate and an electrostatic dust collection anode plate during use; and a guide extension channel matched with the rotary spiral sheet ensures that the adsorption treatment is more sufficient.

Description

Technical Field

[0001] The present invention belongs to the technical field of urea granulation towers, and particularly relates to an exhaust gas treatment device for a urea granulation tower. Background Art

[0002] A urea granulation tower is a device for manufacturing granular urea; the urea solution is evaporated and concentrated to more than 99.5%, and the obtained urea melt is pumped to the top of the granulation tower, sprayed into droplets by a nozzle and dropped, in countercurrent contact with air, cooled and solidified into granular urea with a particle size of 0.8 - 2.5 mm; in order to prevent urea dust from polluting the environment, a filter or a water spray wet dust removal device is installed at the top of the granulation tower; Currently, the treatment of the exhaust gas from urea granulation towers mainly uses wet spray dust removal or mechanical filtration technology, but there are still the following key defects: Incomplete dust removal: The traditional spray technology has a low capture efficiency (only 60% - 70%) for micron-sized urea dust (<10 μm), and it is easy to form aerosol escape; Risk of secondary pollution: The urea-containing wastewater generated by wet dust removal needs to be treated additionally, increasing the operating cost; Difficult equipment maintenance: Dust is easily adhered to the tower wall and the electrode plate, and it is necessary to frequently stop the machine for cleaning, affecting the production efficiency; Insufficient degradation of organic substances: Ammonia and trace formaldehyde and other VOCs in the exhaust gas cannot be removed by conventional electrostatic or filtration methods, and subsequent combustion treatment (high energy consumption) is required; Therefore, it is necessary to design an exhaust gas treatment device for a urea granulation tower to solve the above problems. Summary of the Invention

[0003] The purpose of the present invention is to provide an exhaust gas treatment device for a urea granulation tower to solve the problems mentioned in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: An exhaust gas treatment device for a urea granulation tower, characterized by comprising: A treatment main body, which includes a treatment outer shell, an air inlet is arranged on one side of the lower end of the treatment outer shell, an air outlet is arranged at the upper end, and a treatment middle column is fixedly installed in the middle of the inner side; A treatment mechanism, which includes an electrostatic dust removal unit, including an electrostatic dust removal cathode plate fixed on the inner wall of the treatment outer shell and an electrostatic dust removal anode plate fixedly installed on the surface of the treatment middle column, and both the electrostatic dust removal cathode plate and the electrostatic dust removal anode plate are of annular structures and are fixed through installation grooves; The treatment mechanism further includes a UV photocatalytic oxidation unit, including a UV light decomposition lamp installed on the surface of the treatment middle column and a photocatalyst layer coated on the surface of the electrostatic dust removal anode plate, and the photocatalyst layer is a TiO 2 nanometer coating, and the electrostatic dust removal anode plate adopts a honeycomb structure; The rotary cleaning mechanism includes a rotary seat rotatably mounted on the top of the treatment middle column, a rotary motor for driving the rotary seat, a cleaning scraper rod fixed to the edge of the rotary seat, and a rotary spiral blade arranged in a spiral shape. Silicone scraper blades are provided on the cleaning scraper rod and the rotary spiral blade; The spraying mechanism includes a spraying pump, a spraying pipe and a spraying head arranged inside the treatment middle column, and is used for circulating spraying and treating the adsorbed urea particles; The filtering mechanism is installed at the upper end of the treatment housing and includes a filtering housing and a built-in filter element, and is used for adsorbing water vapor in the tail gas.

[0005] Preferably, an inner strengthening frame and a connecting block are provided inside the rotary spiral blade, and installation slots are formed on its surface to be clamped and fixed with the installation blocks of the silicone scraper blade.

[0006] Preferably, the spraying mechanism further includes a filter screen frame arranged at the lower end of the treatment middle column and a cleaning scraper frame slidably matched with the filter screen frame. The cleaning scraper frame is linked with the rotary seat through a cleaning connecting rod.

[0007] Preferably, an inner strengthening column is arranged inside the treatment middle column, the spraying pipe passes through the inner strengthening column, is connected to the spraying head at the upper end and is connected to the spraying pump at the lower end.

[0008] Preferably, a positioning frame is arranged inside the filter seat of the filtering mechanism to fix the filter element, and the bottom is connected to the discharge port through a discharge ball valve.

[0009] Preferably, a partition plate and a top guide plate are arranged inside the upper end of the treatment middle column for optimizing the air flow distribution.

[0010] Preferably, an intake fan and an exhaust fan are respectively arranged at the intake port and the exhaust port for controlling the air flow rate.

[0011] Preferably, the wavelength of the UV photocatalytic decomposition lamp is 254 nm, and it decomposes organic substances in synergy with the TiO 2 nanocoating.

[0012] Preferably, a filter outlet is formed at the upper end of the filter seat, and the position of the filter outlet corresponds to the position of the exhaust port. A filter inlet is arranged at the lower end of the filter seat.

[0013] Preferably, an installation box is fixedly installed on the upper side of the filter housing. The rotary motor in the installation box is connected to the rotary seat through a rotary shaft for driving the rotary seat, and a cleaning brush blade is fixedly installed inside the rotary spiral blade.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. Through the designed processing mechanism, rotary cleaning mechanism and spraying mechanism, through the coupling of three mechanisms of electrostatic dust removal (physical) + photocatalytic oxidation (chemical) + mechanical cleaning (dynamic), the single - technology bottleneck is broken through. When in use, electrostatic adsorption is carried out through the cooperation of the electrostatic precipitator cathode plate and the electrostatic precipitator anode plate, and the guiding extension channel of the rotating spiral blade is used to ensure more sufficient adsorption treatment. The electrostatic precipitator anode plate adopts a honeycomb structure and is coated with TiO 2 / g - C 3 N 4 composite catalyst. Under the irradiation of UV lamps, hydroxyl radicals are generated to realize the simultaneous progress of dust adsorption and organic matter oxidation. UV photolysis replaces the traditional combustion method, without CO 2 secondary emission.

[0015] 2. Through the designed spraying mechanism, when in use, the spraying liquid is pumped from the bottom inside the processing shell by the spraying pump and sprayed through the spraying head to spray - wash the dust, so as to cooperate with the electrostatic precipitator cathode plate and the electrostatic precipitator anode plate to enhance the dust removal effect.

[0016] 3. Through the designed rotary cleaning mechanism, when in use, the rotating shaft and the rotating seat are driven to rotate by the rotating motor. The rotating seat drives the cleaning scraping rod and the rotating spiral blade to rotate. The surface of the processing middle column and the inner wall of the processing shell are cleaned by the cleaning scraping rod and the silica gel scraping blade, and the adsorbed urea particles are cleaned in cooperation with the spraying of the spraying head, so as to facilitate recycling and reuse.

[0017] 4. Through the designed filtering mechanism, the discharged gas is filtered by the filter element in the filter seat, and at the same time, the moisture in the gas is filtered out and discharged through the discharge ball valve and the discharge port, reducing the discharge of water vapor when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the structural schematic diagram of the present invention; Figure 2 is the processing structural schematic diagram of the present invention; Figure 3 is the cleaning structural schematic diagram of the present invention; Figure 4 is the installation structural schematic diagram of the silica gel scraping blade of the present invention; Figure 5 is the structural schematic diagram of the processing middle column of the present invention; Figure 6 is the top - guiding structural schematic diagram of the present invention; Figure 7 is the top - buffering structural schematic diagram of the present invention; Figure 8 is the spraying - water - absorbing structural schematic diagram of the present invention; Figure 9 is the internal structural schematic diagram of the filter housing of the present invention; Figure 10 Schematic diagram of the filter seat structure of the present invention; Figure 11 Schematic diagram of the electric dust removal anode plate structure of the present invention; In the figure: 1. Processing main body; 11. Processing housing; 12. Air inlet; 13. Air outlet; 14. Processing middle column; 15. Air outlet fan; 16. Air inlet fan; 17. Inner strengthening column; 18. Partition plate; 19. Top guide plate; 2. Filter mechanism; 21. Filter housing; 22. Filter seat; 23. Filter element; 24. Positioning frame; 25. Discharge ball valve; 26. Discharge port; 27. Filter inlet; 28. Filter outlet; 3. Rotary cleaning mechanism; 31. Installation box; 32. Rotary motor; 33. Rotary shaft; 34. Rotary seat; 35. Cleaning scraping rod; 36. Rotary spiral blade; 361. Inner strengthening frame; 362. Connecting block; 37. Silicone scraping blade; 371. Installation clamping block; 372. Installation slot; 38. Cleaning brush blade; 4. Processing mechanism; 41. Electric dust removal cathode plate; 42. Electric dust removal anode plate; 421. Photocatalyst layer; 43. Installation groove; 44. UV light decomposition lamp; 5. Spraying mechanism; 51. Spraying head; 52. Spraying pipe; 53. Spraying pump; 54. Filter mesh frame; 55. Cleaning scraping frame; 56. Cleaning connecting rod. Specific embodiments

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] Embodiment 1: Please refer to Figures 1 to 11 , the present invention provides a technical solution: a tail gas treatment device for a urea granulation tower, including a processing main body 1, a filter mechanism 2 is installed at the upper end of the processing main body 1, a rotary cleaning mechanism 3 is arranged in the middle of the processing main body 1, and a processing mechanism 4 is installed inside the processing main body 1; The processing main body 1 includes a processing housing 11, an air inlet 12 is arranged on one side of the lower end of the processing housing 11, the filter mechanism 2 is installed at the upper end of the processing housing 11, an air outlet 13 is arranged on one side of the filter mechanism 2, the middle part of the inner side of the processing housing 11 is fixedly installed with a processing middle column 14 through bolts, a spraying mechanism 5 is arranged inside the processing middle column 14, an air outlet fan 15 is installed inside the air outlet 13, an air inlet fan 16 is installed inside the air inlet 12, a partition plate 18 is arranged inside the upper end of the processing middle column 14, and a top guide plate 19 is arranged between the partition plates 18. During use, the support is strengthened by the partition plate 18 and the top guide plate 19, so as to ensure more stability during use; The processing mechanism 4 includes an electrostatic precipitator unit and a UV photocatalytic oxidation unit. The electrostatic precipitator unit includes an electrostatic precipitator cathode plate 41 fixed to the inner wall of the processing housing 11 and an electrostatic precipitator anode plate 42 fixedly installed on the surface of the processing central column 14. The electrostatic precipitator anode plate 42 has a honeycomb structure with 200 - 300 pores per square inch. Installation grooves 43 are provided on both the inner wall of the processing housing 11 and the surface of the processing central column 14. The electrostatic precipitator cathode plate 41 and the electrostatic precipitator anode plate 42 are both fixed in the installation grooves 43 by screws. A UV light decomposition lamp 44 is fixedly installed on the surface of the processing central column 14 by screws, and a photocatalyst layer 421 is coated on the surface of the electrostatic precipitator anode plate 42. The photocatalyst layer is a TiO 2 nanometer coating. The wavelength of the UV light decomposition lamp 44 is 254 nm, which decomposes organic substances synergistically with the TiO 2 nanometer coating. Dust is adsorbed and recovered by the static electricity generated by the electrostatic precipitator cathode plate 41 and the electrostatic precipitator anode plate 42 for particulate matters such as urea in the tail gas. At the same time, the irradiation of the UV light decomposition lamp 44 decomposes and oxidizes the organic substances in the tail gas, converting them into low-molecular compounds, water, and carbon dioxide, thereby realizing the purification of the tail gas. The TiO 2 coated with the nanometer coating 2 / g-C 3 N 4 composite catalyst generates hydroxyl radicals (·OH) under the irradiation of the UV light decomposition lamp 44 (254 nm), realizing the simultaneous progress of dust adsorption and organic substance oxidation. The shapes of the electrostatic precipitator cathode plate 41 and the electrostatic precipitator anode plate 42 are both set to be annular, and the electrostatic precipitator cathode plate 41 and the electrostatic precipitator anode plate 42 are both connected to an external power supply through built-in connecting wires, ensuring better effects when the electrostatic precipitator cathode plate 41 and the electrostatic precipitator anode plate 42 are in use; From the above description, it can be seen that the present invention has the following beneficial effects: During use, electrostatic adsorption is carried out through the cooperation of the electrostatic precipitator cathode plate 41 and the electrostatic precipitator anode plate 42, and the guiding extension channel cooperating with the rotating spiral blade 36 ensures more sufficient adsorption treatment. At the same time, the cooperation with the UV light decomposition lamp 44 can achieve the purpose of simultaneous electrostatic adsorption and photocatalytic oxidation, so that the urea dust is directly degraded to CO 2 and H 2 O, avoiding secondary accumulation.

[0021] Further, reference can be made to Figures 1 to 11, the rotary cleaning mechanism 3 includes a rotary seat 34 rotatably mounted on the top of the treatment middle column 14 and a mounting box 31 fixedly mounted on the top of the filtering mechanism 2. A rotary motor 32 is fixedly mounted inside the mounting box 31. The rotary motor 32 is fixedly mounted with a rotary shaft 33 through an output shaft. One end of the rotary shaft 33 is fixedly mounted with the rotary seat 34 by bolts. A cleaning scraper rod 35 is fixedly mounted on the edge of the rotary seat 34 by bolts. A rotary spiral blade 36 is arranged on the outer side of the cleaning scraper rod 35. Silicone scraper blades 37 are arranged on the inner side of the cleaning scraper rod 35 and the outer side of the rotary spiral blade 36. A cleaning brush blade 38 is fixedly mounted on the inner side of the rotary spiral blade 36. The rotary motor 32 drives the rotary shaft 33 and the rotary seat 34 to rotate. The rotary seat 34 drives the cleaning scraper rod 35 and the rotary spiral blade 36 to rotate. The particles adsorbed on the inner wall of the treatment housing 11 and the surface of the treatment middle column 14 are scraped off by the cleaning scraper rod 35 and the silicone scraper blade 37. An inner reinforcing frame 361 is fixedly mounted on the inner side of the rotary spiral blade 36. A connecting block 362 is fixedly mounted on one side of the inner reinforcing frame 361. One end of the connecting block 362 is fixed on the cleaning scraper rod 35. When in use, the inner reinforcing frame 361 ensures that the rotary spiral blade 36 will not be deformed during use, and the connection between the rotary spiral blade 36 and the cleaning scraper rod 35 is strengthened by the connecting block 362. Installation slots 372 are formed on the surface of the rotary spiral blade 36. Installation blocks 371 are arranged on the inner side of the silicone scraper blade 37. The installation blocks 371 are fitted in the installation slots 372 to ensure more stable fixation of the silicone scraper blade 37 during installation.

[0022] For the rotary cleaning mechanism 3 adopting the above technical solution, when in use, the rotary motor 32 drives the rotary shaft 33 and the rotary seat 34 to rotate. The rotary seat 34 drives the cleaning scraper rod 35 and the rotary spiral blade 36 to rotate. The surface of the treatment middle column 14 and the inner wall of the treatment housing 11 are cleaned by the cleaning scraper rod 35 and the silicone scraper blade 37, and the urea particles adsorbed are cleaned in cooperation with the spraying of the spray head 51, so as to facilitate recycling and reuse.

[0023] Embodiment 2: Please refer to Figures 1 to 11As shown, based on the first embodiment, the present invention provides a technical solution: an inner strengthening column 17 is installed inside the treatment middle column 14. The inner strengthening column 17 is fixedly connected to the treatment middle column 14 through a support block. The spraying mechanism 5 includes a spraying pump 53 installed at the inner bottom of the treatment middle column 14, a spraying pipe 52 installed inside the inner strengthening column 17, and a spraying head 51 installed on the treatment middle column 14. Both ends of the spraying pipe 52 are connected to the spraying head 51 and the spraying pump 53. By operating the spraying pump 53, the spraying liquid is pumped out from the inner bottom of the treatment outer shell 11 and sprayed out through the spraying pipe 52 and the spraying head 51 for spraying. While washing the residual particles in the tail gas with water, the urea scraped from the inner wall of the treatment outer shell 11 and the surface of the treatment middle column 14 is washed down; a filter screen frame 54 is fixedly installed on the outer side of the lower end of the treatment middle column 14. One end of the spraying pump 53 is communicated with the inner side of the filter screen frame 54. The filter screen frame 54 filters the spraying liquid and then extracts it for reuse; a cleaning scraping frame 55 is slidably installed on the outer side of the filter screen frame 54. A cleaning connecting rod 56 is fixedly installed on the upper side of the cleaning scraping frame 55 by screws. The upper end of the cleaning connecting rod 56 is fixedly connected to the rotating seat 34 by bolts. By rotating the cleaning scraping rod 35, the cleaning connecting rod 56 and the cleaning scraping frame 55 are driven to clean the surface of the filter screen frame 54; The spraying mechanism 5 adopting the above technical solution, when in use, extracts the spraying liquid from the inner bottom of the treatment outer shell 11 through the spraying pump 53 and sprays it out through the spraying head 51 to spray and wash the dust, thereby cooperating with the electrostatic precipitation cathode plate 41 and the electrostatic precipitation anode plate 42 to enhance the dust removal effect.

[0024] Further, refer to Figures 1 to 11 , the filtering mechanism 2 includes a filtering outer shell 21 fixedly installed on the treatment outer shell 11 by bolts and a filtering seat 22 installed inside the filtering outer shell 21. The installation box 31 and the rotating motor 32 are installed on the filtering outer shell 21. The rotating shaft 33 is installed inside the filtering outer shell 21. The lower end of the filtering seat 22 is communicated with the inside of the treatment outer shell 11 and is provided with a discharge ball valve 25 and a discharge port 26. The upper end of the filtering seat 22 is provided with a filtering outlet 28, and the position of the filtering outlet 28 corresponds to the position of the air outlet 13. The lower end of the filtering seat 22 is provided with a filtering inlet 27. When in use, the tail gas after spraying and adsorption enters the inner side of the filtering seat 22 through the filtering inlet 27 and is adsorbed by the filter element 23, thereby adsorbing the water vapor and discharging it through the filtering outlet 28; a positioning frame 24 is fixedly installed inside the filtering seat 22 by screws. The filter element 23 is arranged inside the positioning frame 24. The discharge port 26 is connected to the lower end of the filter element 23 through the discharge ball valve 25, which is convenient for installing and using the filter element 23 during use and ensures that the filter element 23 is installed more stably.

[0025] The filtering mechanism 2 adopting the above technical solution filters the discharged gas through the filter element 23 in the filter seat 22, and at the same time filters out the moisture in the gas, and discharges it through the discharge ball valve 25 and the discharge port 26, reducing the discharge of water vapor during use.

[0026] The working principle and usage process of the present invention: During use, the air inlet 12 is connected to the exhaust gas outlet of the urea granulation tower. In cooperation with a blower, etc. and the intake air fan 16, the exhaust gas enters the treatment housing 11. The exhaust gas is guided to flow through the rotating spiral blades 36 outside the treatment middle column 14. The static electricity generated by the electrostatic precipitation cathode plate 41 and the electrostatic precipitation anode plate 42 adsorbs dust, adsorbing and recovering particulate matters such as urea in the exhaust gas. At the same time, the irradiation of the UV light decomposition lamp 44 decomposes and oxidizes the organic matters in the exhaust gas, converting them into low-molecular compounds, water and carbon dioxide, thereby realizing the purification of the exhaust gas. At the same time, the rotating motor 32 drives the rotating shaft 33 and the rotating seat 34 to rotate. The rotating seat 34 drives the cleaning scraping rod 35 and the rotating spiral blades 36 to rotate. The cleaning scraping rod 35 and the silica gel scraping blade 37 scrape off the particles adsorbed on the inner wall of the treatment housing 11 and the surface of the treatment middle column 14, and guide them to fall through the rotating spiral blades 36. The liquid is pumped out from the inner bottom of the treatment housing 11 through the spray pump 53, sprayed through the spray pipe 52 and the spray head 51 for spraying. While washing the residual particles of the exhaust gas with water, the urea scraped off from the inner wall of the treatment housing 11 and the surface of the treatment middle column 14 is washed down. At the same time, the filter mesh frame 54 filters the spray liquid for re-extraction and use, and the cleaning scraping rod 35 rotates to drive the cleaning connecting rod 56 and the cleaning scraping frame 55 to clean the surface of the filter mesh frame 54, thus ensuring more convenience when extracting the spray liquid. The exhaust gas after spray adsorption is adsorbed by the filter element 23 in the filter seat 22, and then discharged through the filter outlet 28 and the air outlet 13.

[0027] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0028] The above is only used to illustrate the technical solution of the present invention and not to limit it. Any other modifications or equivalent substitutions made by those of ordinary skill in the art to the technical solution of the present invention shall be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A tail gas treatment device for a urea granulation tower, characterized in that: include: A processing body (1) comprises a processing shell (11), wherein an air inlet (12) is arranged on one side of the lower end of the processing shell (11), an air outlet (13) is arranged on the upper end, and a processing center column (14) is fixedly installed in the middle of the inner side; A processing mechanism (4) comprising an electrostatic precipitator unit, comprising an electrostatic precipitator cathode plate (41) fixed to the inner wall of a processing housing (11) and an electrostatic precipitator anode plate (42) fixedly mounted on the surface of a processing center column (14), wherein the electrostatic precipitator cathode plate (41) and the electrostatic precipitator anode plate (42) are both annular structures and are fixed via a mounting groove (43); The treatment mechanism (4) also includes a UV photocatalytic oxidation unit, including a UV photodecomposition lamp (44) installed on the surface of the treatment column (14) and a photocatalyst layer (421) coated on the surface of the electrostatic precipitator anode plate (42), wherein the photocatalyst layer is a TiO2 nano-coating, and the electrostatic precipitator anode plate (42) adopts a honeycomb structure; A rotary cleaning mechanism (3) comprises a rotary seat (34) rotatably mounted on the top of the processing center column (14), a rotary motor (32) driving the rotary seat (34), a cleaning scraper rod (35) fixed to the edge of the rotary seat (34), and a spirally arranged rotary spiral blade (36), wherein a silicone scraper blade (37) is arranged on the cleaning scraper rod (35) and the rotary spiral blade (36); A spray mechanism (5) comprising a spray pump (53), a spray pipe (52) and a spray head (51) arranged inside the treatment center column (14), and used for circulating spray treatment of adsorbed urea particles; The filter mechanism (2) is installed at the upper end of the processing housing (11), and comprises a filter housing (21) and a built-in filter element (23), and is used to absorb water vapor in the exhaust gas.

2. The tail gas treatment device of the urea granulation tower according to claim 1, characterized in that: An inner reinforcing frame (361) and a connecting block (362) are provided on the inner side of the rotating spiral blade (36), and a mounting groove (372) is provided on the surface thereof for engaging and fixing with the mounting block (371) of the silicone scraper blade (37).

3. The tail gas treatment device of the urea granulation tower according to claim 1, characterized in that: The spray mechanism (5) further comprises a filter rack (54) arranged at the lower end of the processing center column (14) and a cleaning scraper (55) slidably matched therewith, and the cleaning scraper (55) is linked to the rotating seat (34) via a cleaning connecting rod (56).

4. The tail gas treatment device of the urea granulation tower according to claim 1, characterized in that: An inner reinforcement column (17) is provided inside the processing middle column (14), and a spray pipe (52) is passed through the inner reinforcement column (17), with an upper end connected to a spray head (51) and a lower end connected to a spray pump (53).

5. The tail gas treatment device of the urea granulation tower according to claim 1, characterized in that: A positioning frame (24) is provided inside the filter seat (22) of the filter mechanism (2) to fix the filter core (23), and the bottom is connected to a discharge port (26) via a discharge ball valve (25).

6. The tail gas treatment device of the urea granulation tower according to claim 5, characterized in that: A partition plate (18) and a top guide plate (19) are provided on the inner side of the upper end of the processing center column (14) for optimizing airflow distribution.

7. The tail gas treatment device of the urea granulation tower according to claim 6, characterized in that: The air inlet (12) and the air outlet (13) are respectively provided with an air inlet fan (16) and an air outlet fan (15) for controlling the air flow rate.

8. The tail gas treatment device of the urea granulation tower according to claim 1, characterized in that: The UV light decomposition lamp (44) has a wavelength of 254 nm and works synergistically with the TiO2 nano-coating to decompose organic matter.

9. The tail gas treatment device of the urea granulation tower according to claim 5, characterized in that: A filter outlet (28) is provided at the upper end of the filter seat (22), and the position of the filter outlet (28) corresponds to the position of the air outlet (13), and a filter inlet (27) is provided at the lower end of the filter seat (22).

10. The tail gas treatment device of the urea granulation tower according to claim 1, characterized in that: A mounting box (31) is fixedly mounted on the upper side of the filter housing (21); a rotating motor (32) in the mounting box (31) is connected to a rotating seat (34) via a rotating shaft (33) and is used to drive the rotating seat (34); a cleaning brush (38) is fixedly mounted on the inner side of the rotating spiral sheet (36).

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