A urea prilling tower tail gas treatment device

Abstract

The application provides a urea prilling tower tail gas treatment device, and relates to the technical field of tail gas treatment. The device comprises a urea prilling tower body, a tail gas treatment box is fixedly arranged in the urea prilling tower body, the upper part of the tail gas treatment box extends to the outside of the urea prilling tower body, a clean gas chamber, a tail gas treatment chamber and a prilling chamber are sequentially arranged in the tail gas treatment box from top to bottom, a tail gas inlet for connecting the tail gas treatment chamber and the inside of the urea prilling tower body is arranged on the side of the tail gas treatment box, a plurality of tail gas outlets for connecting the clean gas chamber are arranged on the top of the tail gas treatment box, an ammonia and dust removal assembly for connecting the clean gas chamber is arranged in the tail gas treatment chamber, and a spraying assembly for spraying urea solution into the urea prilling tower body is arranged in the prilling chamber. The ammonia and dust removal assembly effectively treats the smoke dust and free ammonia in the tail gas, solves the problem of smoke dust trailing at the top of the prilling tower, eliminates the interference of free ammonia peculiar smell, helps to relieve air pollution, and protects the ecological environment and human health.

Description

Technical Field

[0001] This application relates to the field of exhaust gas treatment technology, and more specifically, to a method. Background Technology

[0002] In the urea production process, the granulation tower is a crucial piece of equipment. The urea solution is sprayed into the granulation tower through nozzles, where it comes into contact with the cold air inside the tower, completing the cooling and solidification process into granules.

[0003] However, during urea granulation, some insufficiently solidified fine particles escape with the exhaust gas discharged from the top of the tower, forming visible smoke trails outside the tower. This not only causes losses of urea products and reduces production efficiency, but also seriously affects the surrounding air quality. In addition, urea decomposes during granulation to produce free ammonia, which is discharged into the atmosphere with the exhaust gas. Free ammonia not only has a strong pungent odor, causing great distress to the lives of residents in the factory area and surrounding areas and triggering odor complaints, but also participates in the formation of secondary aerosols in the atmosphere, exacerbating air pollution such as smog, increasing PM2.5 concentration, and posing a threat to human health and the ecological environment.

[0004] Therefore, a tail gas treatment device for urea granulation tower is needed to solve the above problems. Summary of the Invention

[0005] The purpose of this application is to provide a urea granulation tower tail gas treatment device, which can solve the technical problems mentioned in the background art.

[0006] This application provides a tail gas treatment device for a urea granulation tower, including a urea granulation tower body. A tail gas treatment box is fixed inside the urea granulation tower body, and the upper part of the tail gas treatment box extends outside the urea granulation tower body. The tail gas treatment box is provided with a clean gas chamber, a tail gas treatment chamber and a granulation chamber arranged sequentially from top to bottom. The side of the tail gas treatment box is provided with a tail gas inlet for communicating the tail gas treatment chamber with the interior of the urea granulation tower body. The top of the tail gas treatment box is provided with a plurality of tail gas outlets communicating with the clean gas chamber. The tail gas treatment chamber is provided with an ammonia removal and dust removal component communicating with the clean gas chamber. The granulation chamber is provided with a spray component for spraying urea solution into the urea granulation tower body.

[0007] Furthermore, the ammonia removal and dust removal assembly includes a tube sheet and a plurality of elastic filter bags evenly arranged at the bottom of the tube sheet. The tube sheet is fixed to the exhaust gas treatment box and separates the clean gas chamber from the exhaust gas treatment chamber. The surface of the elastic filter bags is provided with a catalyst.

[0008] Furthermore, the spray assembly includes a urea solution delivery pipe and an ultrasonic atomizing nozzle. The urea solution delivery pipe is located in the granulation chamber. One end of the urea solution delivery pipe bends downward and extends to the lower part of the exhaust gas treatment box and is connected to the ultrasonic atomizing nozzle. The other end of the urea solution delivery pipe extends to the body of the urea granulation tower.

[0009] Furthermore, it also includes a dust removal assembly, which includes a blowpipe and multiple high-pressure jet nozzles disposed on the blowpipe. The blowpipe is disposed in the clean air chamber, and the high-pressure jet nozzles correspond one-to-one with the elastic filter bags. The air inlet end of the blowpipe extends to the outside of the exhaust gas treatment box.

[0010] Furthermore, it also includes a dust cleaning assembly for cleaning dust at the bottom of the exhaust gas treatment chamber. The dust cleaning assembly includes a flushing water tank, an annular flushing pipe, a connecting pipe, a circulating pump, a water inlet pipe, a circulating pipe, and a sludge discharge pipe. The flushing water tank is fixed within the granulation chamber, and the annular flushing pipe is fixed at the bottom of the exhaust gas treatment chamber. Multiple downward-facing dust flushing nozzles are evenly arranged on the annular flushing pipe. The connecting pipe connects the annular flushing pipe to the flushing water tank. The circulating pump is located within the granulation chamber. The connecting pipe is fixed in the granulation chamber. The upper end of the circulation pipe is connected to the bottom of the exhaust gas treatment chamber, and the lower end of the circulation pipe extends into the flushing water tank. One end of the water inlet pipe is connected to the upper part of the flushing water tank, and the other end of the water inlet pipe extends to the outside of the urea granulation tower body. The outer end of the water inlet pipe is equipped with a water inlet valve. One end of the sludge discharge pipe is connected to the lower part of the flushing water tank, and the other end of the sludge discharge pipe extends to the outside of the urea granulation tower body. The outer end of the sludge discharge pipe is equipped with a sludge discharge valve.

[0011] Furthermore, the urea granulation tower body is equipped with louvers, which are located at the bottom of the exhaust gas treatment box.

[0012] Furthermore, an induced draft fan is provided at the exhaust gas outlet.

[0013] Furthermore, an annular air guide plate is fixedly installed in the exhaust gas treatment chamber. The annular air guide plate has a Venturi tube structure, and the elastic filter bag is located inside the inner ring of the annular air guide plate.

[0014] Furthermore, it also includes multiple bag flushing assemblies, each corresponding to one of the elastic bags. The bag flushing assemblies are located on top of the exhaust gas treatment box. Each bag flushing assembly includes a bag flushing pipe, a transfer box, and multiple bag flushing nozzles. The transfer box is located above the exhaust gas treatment box. One end of the bag flushing pipe is connected to the transfer box. The multiple bag flushing nozzles are evenly fixed to the bottom of the transfer box, and the spray nozzles of the bag flushing nozzles are located in the clean gas chamber.

[0015] The beneficial effects of this utility model are:

[0016] This invention features a tail gas inlet on the side of the tail gas treatment box, connecting the tail gas treatment chamber to the interior of the urea granulation tower. The tail gas treatment chamber contains an ammonia removal and dust removal component connected to the clean gas chamber. This component treats the smoke and dust in the tail gas, effectively solving the problem of smoke trailing from the top of the granulation tower. It reduces the emission of insufficiently solidified fine urea particles into the atmosphere, lowering pollution to the surrounding environment and improving regional air quality. Furthermore, the ammonia removal and dust removal component removes free ammonia from the tail gas, preventing the irritating odor emitted by free ammonia from interfering with the lives of residents in the factory area and surrounding areas, reducing odor complaints. Simultaneously, it reduces the probability of free ammonia participating in the formation of secondary aerosols in the atmosphere, helping to alleviate smog and other air pollution problems, protecting the ecological environment and human health. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 These are schematic diagrams of structures in some embodiments of this application;

[0019] The reference numerals in the attached figures are as follows:

[0020] 1. Urea granulation tower body; 2. Tail gas treatment box; 21. Clean gas chamber; 22. Tail gas treatment chamber; 23. Granulation chamber; 3. Tail gas inlet; 4. Tail gas outlet; 5. Ammonia and dust removal components; 51. Tube plate; 52. Elastic filter bag; 521. Catalyst; 6. Spray assembly; 61. Urea solution conveying pipe; 62. Ultrasonic atomizing nozzle; 7. Dust removal assembly; 71. Blowing pipe; 72. High-pressure jet nozzle; 8. Dust cleaning assembly; 81. Flushing water tank; 82. Annular flushing pipe; 821. Dust flushing nozzle; 83. Connecting pipe; 84. Circulation pump; 85. Water inlet pipe; 86. Circulation pipe; 87. Sludge discharge pipe; 9. Louver; 10. Exhaust fan; 11. Annular air guide plate; 12. Filter bag flushing assembly; 121. Filter bag flushing pipe; 122. Transfer box; 123. Filter bag flushing nozzle. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Specific implementation examples:

[0028] like Figure 1As shown, this application provides a urea granulation tower tail gas treatment device, including a urea granulation tower body 1, a tail gas treatment box 2 fixed inside the urea granulation tower body 1, the upper part of the tail gas treatment box 2 extending outside the urea granulation tower body 1, and a clean gas chamber 21, a tail gas treatment chamber 22, and a granulation chamber 23 arranged sequentially from top to bottom inside the tail gas treatment box 2. The side of the tail gas treatment box 2 is provided with a tail gas inlet 3 for communicating the tail gas treatment chamber 22 with the interior of the urea granulation tower body 1, and the top of the tail gas treatment box 2 is provided with multiple outlets communicating with the clean gas chamber 21. The exhaust gas outlet 4 and the exhaust gas treatment chamber 22 are equipped with an ammonia removal and dust removal component 5 connected to the clean gas chamber 21. The granulation chamber 23 is equipped with a spray component 6 for spraying urea solution into the urea granulation tower body 1. In use, the spray component 6 sprays urea solution into the urea granulation tower body 1. The urea solution comes into contact with the cold air inside the urea granulation tower body 1 (the process of introducing cold air into the urea granulation tower body 1 is prior art and will not be described in detail here). After cooling, the urea solution gradually solidifies into granules, completing the urea granulation process. In the basic process of urea granulation, exhaust gas containing insufficiently solidified fine urea particles (dust) and free ammonia is generated. The exhaust gas enters the exhaust gas treatment chamber 22 of the exhaust gas treatment box 2 through the exhaust gas inlet 3. The free ammonia and dust in the exhaust gas are treated by the ammonia removal and dust removal component 5. The clean exhaust gas after treatment enters the clean gas chamber 21 and is then discharged into the external environment through multiple exhaust gas outlets 4 at the top of the exhaust gas treatment box 2. The treatment of dust in the exhaust gas by the ammonia removal and dust removal component 5 effectively solves the problem of dust trailing at the top of the granulation tower, reduces the emission of insufficiently solidified fine urea particles into the atmosphere, reduces pollution to the surrounding atmospheric environment, and improves the regional air quality. In addition, the ammonia removal and dust removal component 5 can remove free ammonia in the exhaust gas, avoiding the interference of the irritating odor emitted by free ammonia on the lives of residents in the factory area and surrounding areas, reducing odor complaints. At the same time, it reduces the probability of free ammonia participating in the formation of secondary aerosols in the atmosphere, which helps to alleviate air pollution problems such as smog and protect the ecological environment and human health.

[0029] like Figure 1As shown, the ammonia removal and dust removal component 5 includes a tube sheet 51 and multiple elastic filter bags 52 evenly arranged at the bottom of the tube sheet 51. The tube sheet 51 is fixed to the exhaust gas treatment box 2 and separates the clean gas chamber 21 from the exhaust gas treatment chamber 22. The surface of the elastic filter bags 52 is provided with a catalyst 521. Specifically, the tube sheet 51 is a plate with multiple through holes, and the elastic filter bags 52 correspond one-to-one with the through holes. The catalyst 521 is activated alumina. The activated alumina supported catalyst 521 is attached to the elastic filter bags 52 by spraying, impregnation, or other methods. Dust-laden exhaust gas enters from the exhaust gas treatment chamber 22. When the airflow passes through the elastic filter bags 52... When the filter bag 52 is in use, dust particles are intercepted and filtered by the filter bag. When ammonia passes through the elastic filter bag 52, it is adsorbed by the catalyst 521 and then undergoes an oxidation catalytic reaction under the action of the catalyst 521, and is converted into water and nitrogen, thereby achieving the effect of ammonia removal. The tube sheet 51 separates the clean gas chamber 21 from the exhaust gas treatment chamber 22, so that the clean gas after being filtered by the filter bag and ammonia removal enters the clean gas chamber 21 and is finally discharged from the exhaust gas outlet 4. The setting of the elastic filter bag 52 and the catalyst 521 realizes the simultaneous removal of ammonia and dust in the exhaust gas, improving the efficiency and quality of exhaust gas treatment.

[0030] like Figure 1 As shown, the spray assembly 6 includes a urea solution delivery pipe 61 and an ultrasonic atomizing nozzle 62. The urea solution delivery pipe 61 is located inside the granulation chamber 23. One end of the urea solution delivery pipe 61 bends downward and extends to the lower part of the exhaust gas treatment box 2 and connects to the ultrasonic atomizing nozzle 62. The other end of the urea solution delivery pipe 61 extends to the outside of the urea granulation tower body 1. Specifically, the outer end of the urea solution delivery pipe 61 is used to connect to the urea solution supply source. The urea solution is delivered to the ultrasonic atomizing nozzle 62 through the urea solution delivery pipe 61. The ultrasonic atomizing nozzle 62 can efficiently atomize the urea solution into tiny droplets, increasing the contact area between the urea solution and the cold air inside the urea granulation tower body 1, thereby improving the granulation efficiency.

[0031] like Figure 1 As shown, the urea granulation tower tail gas treatment device of this application also includes a dust removal component 7. The dust removal component 7 includes a blow pipe 71 and a plurality of high-pressure jet nozzles 72 disposed on the blow pipe 71. The blow pipe 71 is disposed in the clean air chamber 21. The high-pressure jet nozzles 72 correspond one-to-one with the elastic filter bags 52. The air inlet end of the blow pipe 71 extends to the outside of the tail gas treatment box 2. The outer end of the blow pipe 71 is used to connect to an external high-pressure air source. When it is necessary to clean the elastic filter bags 52, the high-pressure air source introduces high-pressure gas into the blow pipe 71. The high-pressure gas is sprayed onto the elastic filter bags 52 in the form of high-speed airflow through the high-pressure jet nozzles 72, causing the filter bags to deform and vibrate instantaneously. The dust particles attached to the surface of the filter bags fall off under the action of impact and vibration, thereby achieving the purpose of dust removal.

[0032] like Figure 1As shown, the urea granulation tower tail gas treatment device of this application also includes a dust cleaning component 8 for cleaning dust at the bottom of the tail gas treatment chamber 22. The dust cleaning component 8 includes a flushing water tank 81, an annular flushing pipe 82, a connecting pipe 83, a circulating pump 84, a water inlet pipe 85, a circulating pipe 86, and a sludge discharge pipe 87. The flushing water tank 81 is fixed inside the granulation chamber 23, and the annular flushing pipe 82 is fixed at the bottom of the tail gas treatment chamber 22. The annular flushing pipe 82 has a plurality of downward-facing nozzles evenly arranged on it. A dust flushing nozzle 821 and a connecting pipe 83 are used to connect the annular flushing pipe 82 to the flushing water tank 81. A circulating pump 84 is installed on the connecting pipe 83 and fixed inside the granulation chamber 23. The upper end of the circulating pipe 86 is connected to the bottom of the exhaust gas treatment chamber 22, and the lower end of the circulating pipe 86 extends into the flushing water tank 81. One end of the water inlet pipe 85 is connected to the upper part of the flushing water tank 81, and the other end of the water inlet pipe 85 extends to the outside of the urea granulation tower body 1. The outer end of the water inlet pipe 85 is provided with a water inlet. A valve (not shown in the figure) is provided at one end of the sludge discharge pipe 87, which is connected to the lower part of the flushing water tank 81. The other end of the sludge discharge pipe 87 extends to the outside of the urea granulation tower body 1. A sludge discharge valve (not shown in the figure) is provided at the outer end of the sludge discharge pipe 87. During the dust removal process, the detached dust will fall into the bottom of the exhaust gas treatment chamber 22. By opening the water inlet valve, external water can flow into the flushing water tank 81 through the water inlet pipe 85. When the water in the flushing water tank 81 reaches the required water level, the water inlet valve is closed, and the circulation pump 84 will flush the water. Water in water tank 81 is transported to annular flushing pipe 82 through connecting pipe 83, and then sprayed out at high speed from dust flushing nozzle 821 to flush the dust accumulated at the bottom of exhaust gas treatment chamber 22, so that the dust and water are mixed to form a slurry. After flushing, the water containing dust flows back to flushing water tank 81 through circulation pipe 86 under the action of gravity. When draining sludge, the sludge draining valve and water inlet valve are opened and the circulation pump 84 is closed. The dust and sludge in flushing water tank 81 are discharged by simultaneously supplying water and draining sludge.

[0033] like Figure 1 As shown, a louver 9 is fixed inside the urea granulation tower body 1. The louver 9 is located at the bottom of the exhaust gas treatment box 2. The blades of the louver 9 will block and divert the exhaust gas, so that the exhaust gas moves upward in a more uniform manner. To a certain extent, the exhaust gas entering the exhaust gas treatment box 2 is more uniform, which helps to improve the efficiency and effect of the subsequent exhaust gas treatment process.

[0034] like Figure 1 As shown, an induced draft fan 10 is installed at the four exhaust gas outlets. The induced draft fan 10 can provide power for the exhaust gas, ensuring that the treated exhaust gas can be smoothly discharged from the urea granulation tower, avoiding the accumulation of exhaust gas in the tower, and ensuring the normal operation of the exhaust gas treatment system.

[0035] like Figure 1As shown, an annular air guide plate 11 is fixedly installed in the exhaust gas treatment chamber 22. The annular air guide plate 11 has a Venturi tube structure. The elastic filter bag 52 is located in the inner ring of the annular air guide plate 11. The annular air guide plate 11 with Venturi tube structure consists of a converging section, a throat and a diffuser section, which can accelerate the airflow through the perforated plate 51 and improve the exhaust gas treatment efficiency.

[0036] like Figure 1 As shown, the urea granulation tower tail gas treatment device of this application also includes multiple bag flushing assemblies 12, each corresponding to an elastic filter bag 52. The bag flushing assemblies 12 are located on top of the tail gas treatment box 2. Each bag flushing assembly 12 includes a bag flushing pipe 121, a transfer box 122, and multiple bag flushing nozzles 123. The transfer box 122 is located above the tail gas treatment box 2. One end of the bag flushing pipe 121 is connected to the transfer box 122. The multiple bag flushing nozzles 123 are evenly fixed to the bottom of the transfer box 122, and the spray nozzles of the bag flushing nozzles 123 are located inside the clean gas chamber 21. The filter bag flushing pipe 121 is used to connect to an external water supply. When the elastic filter bag 52 needs to be flushed, the granulation process stops. Water enters the transfer box 122 through the filter bag flushing pipe 121 and is then sprayed out by the filter bag flushing nozzle 123 to flush the elastic filter bag 52, removing dust, impurities and other pollutants that may accumulate on the surface of the elastic filter bag 52. In conjunction with the dust removal component 7, a high-pressure airflow is sprayed to dry the elastic filter bag 52, restoring the air permeability and filtration performance of the elastic filter bag 52, reducing the frequency of filter bag replacement due to clogging, and extending the service life of the elastic filter bag 52.

[0037] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A tail gas treatment device for urea granulation tower, characterized in that: The system includes a urea granulation tower body, within which a tail gas treatment box is fixed. The upper part of the tail gas treatment box extends outside the urea granulation tower body. The tail gas treatment box contains, from top to bottom, a clean gas chamber, a tail gas treatment chamber, and a granulation chamber. The side of the tail gas treatment box has a tail gas inlet for connecting the tail gas treatment chamber to the interior of the urea granulation tower body. The top of the tail gas treatment box has multiple tail gas outlets connected to the clean gas chamber. The tail gas treatment chamber contains an ammonia removal and dust removal assembly connected to the clean gas chamber. The granulation chamber contains a spray assembly for spraying urea solution into the urea granulation tower body.

2. The urea granulation tower tail gas treatment device according to claim 1, characterized in that: The ammonia removal and dust removal assembly includes a tube sheet and a plurality of elastic filter bags evenly arranged at the bottom of the tube sheet. The tube sheet is fixed to the exhaust gas treatment box and separates the clean gas chamber from the exhaust gas treatment chamber. The surface of the elastic filter bags is provided with a catalyst.

3. The urea granulation tower tail gas treatment device according to claim 1, characterized in that: The spray assembly includes a urea solution delivery pipe and an ultrasonic atomizing nozzle. The urea solution delivery pipe is located in the granulation chamber. One end of the urea solution delivery pipe bends downward and extends to the lower part of the exhaust gas treatment box and is connected to the ultrasonic atomizing nozzle. The other end of the urea solution delivery pipe extends to the body of the urea granulation tower.

4. The urea granulation tower tail gas treatment device according to claim 2, characterized in that: It also includes a dust removal assembly, which includes a blowpipe and multiple high-pressure jet nozzles disposed on the blowpipe. The blowpipe is disposed in the clean air chamber, and the high-pressure jet nozzles correspond one-to-one with the elastic filter bags. The air inlet end of the blowpipe extends to the outside of the exhaust gas treatment box.

5. The urea granulation tower tail gas treatment device according to claim 4, characterized in that: It also includes a dust cleaning assembly for cleaning dust at the bottom of the exhaust gas treatment chamber. The dust cleaning assembly includes a flushing water tank, an annular flushing pipe, a connecting pipe, a circulating pump, a water inlet pipe, a circulating pipe, and a sludge discharge pipe. The flushing water tank is fixed in the granulation chamber, and the annular flushing pipe is fixed at the bottom of the exhaust gas treatment chamber. Multiple downward-facing dust flushing nozzles are evenly arranged on the annular flushing pipe. The connecting pipe connects the annular flushing pipe to the flushing water tank. The circulating pump is mounted on the connecting pipe and fixed in the granulation chamber. The upper end of the circulating pipe is connected to the bottom of the exhaust gas treatment chamber, and the lower end of the circulating pipe extends into the flushing water tank. One end of the water inlet pipe is connected to the upper part of the flushing water tank, and the other end of the water inlet pipe extends to the outside of the urea granulation tower body. An inlet valve is provided at the outer end of the water inlet pipe. One end of the sludge discharge pipe is connected to the lower part of the flushing water tank, and the other end of the sludge discharge pipe extends to the outside of the urea granulation tower body. A sludge discharge valve is provided at the outer end of the sludge discharge pipe.

6. The urea granulation tower tail gas treatment device according to claim 1, characterized in that: The urea granulation tower body is equipped with louvers, which are located at the bottom of the exhaust gas treatment box.

7. The urea granulation tower tail gas treatment device according to claim 1, characterized in that: An induced draft fan is installed at the exhaust gas outlet.

8. The urea granulation tower tail gas treatment device according to claim 2, characterized in that: An annular air guide plate is fixedly installed in the exhaust gas treatment chamber. The annular air guide plate has a Venturi tube structure, and the elastic filter bag is located inside the inner ring of the annular air guide plate.

9. The urea granulation tower tail gas treatment device according to claim 2, characterized in that: It also includes multiple bag flushing assemblies, each corresponding to one of the elastic bags. The bag flushing assemblies are located on the top of the exhaust gas treatment box. Each bag flushing assembly includes a bag flushing pipe, a transfer box, and multiple bag flushing nozzles. The transfer box is located above the exhaust gas treatment box. One end of the bag flushing pipe is connected to the transfer box. The multiple bag flushing nozzles are evenly fixed to the bottom of the transfer box. The spray nozzles of the bag flushing nozzles are located in the clean gas chamber.

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