Equipment and method for treating tail gas of granulation tower for producing sulfur-based compound fertilizer

Abstract

The invention relates to the technical field of tail gas treatment, and discloses granulation tower tail gas treatment equipment and method.The granulation tower tail gas treatment equipment for sulfur-based compound fertilizer production comprises a granulation tower body and a plurality of bases arranged at the top of the granulation tower body in an annular array mode; the dehumidification mechanism is arranged at the top of the base table, and the dust removal mechanism is arranged in the dehumidification mechanism and used for cleaning tail gas; the dehumidifying mechanism comprises a spraying chamber arranged at the top of the base station, a liquefying chamber arranged at the top of the spraying chamber, a condensing unit arranged on the inner wall of the liquefying chamber and used for condensing water vapor, and a copper pipe arranged at the top of the condensing unit, the spraying chamber can contain tail gas and water, the liquefying chamber can contain condensed water, and a circulating channel of a refrigerant is formed in the copper pipe; the compression unit is arranged at the bottom end of the copper pipe and used for pushing refrigerant to flow. And by arranging the dehumidification mechanism, recycling of water resources is achieved, and the requirement for extra water sources is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of tail gas treatment, and particularly to a tail gas treatment device and method for a granulation tower in the production of sulfur-based compound fertilizers. Background Art

[0002] The tail gas generated during the granulation process usually contains pollutants such as dust, sulfur dioxide, and nitrogen oxides. Direct emission will pollute the atmospheric environment and endanger human health. Tail gas treatment equipment can effectively remove these pollutants and make the emission meet environmental protection standards.

[0003] Traditional tail gas treatment equipment is widely used in the engineering field. However, due to the limitations of its structure and working principle, there are often some problems that cannot be ignored. For example, when traditional tail gas treatment equipment treats the tail gas of a granulation tower, it often ignores the utilization value of the large amount of moisture carried in the tail gas. This moisture usually exists in the tail gas in the form of water vapor or tiny water droplets and is discharged into the atmosphere as part of the waste gas, resulting in a waste of water resources. At the same time, in the dust removal process, traditional tail gas treatment equipment usually requires an additional water source supply. For example, a wet dust collector needs spray water to capture dust, which not only increases the consumption of water resources but also generates a large amount of waste water that needs further treatment, increasing the environmental protection pressure. Summary of the Invention

[0004] In view of the problems in the prior art that the tail gas treatment equipment cannot utilize the moisture in the tail gas and the dust removal process requires an additional water source to be set up, a tail gas treatment device for a granulation tower in the production of sulfur-based compound fertilizers is proposed.

[0005] Its purpose is to collect moisture while dehumidifying the tail gas and use the collected moisture for dust removal to reduce resource waste.

[0006] The technical solution of the present invention is a tail gas treatment device for a granulation tower in the production of sulfur-based compound fertilizers, which includes a granulation tower main body, a number of bases annularly arranged on the top of the granulation tower main body, and further includes a dehumidification mechanism arranged on the top of the base and a dust removal mechanism arranged inside the dehumidification mechanism for cleaning the tail gas; The dehumidification mechanism includes a spray chamber disposed at the top of the base platform. The interior of the spray chamber can accommodate tail gas and water. There is a liquefaction chamber disposed at the top of the spray chamber, which can hold condensed water. A condensation unit is provided on the inner wall of the liquefaction chamber for condensing water vapor. There is a copper tube disposed at the top of the condensation unit, and a circulation channel for the refrigerant is formed inside the copper tube. A compression unit is provided at the bottom end of the copper tube for pushing the refrigerant to flow. A housing is disposed on one side of the spray chamber close to the compression unit, and the housing provides protection for the components inside. An air inlet is provided on the side of the spray chamber away from the compression unit, and the tail gas enters the interior of the spray chamber through the air inlet. An exhaust port is provided at the top of the liquefaction chamber, and the tail gas is discharged through the exhaust port. And a drain port is provided at the bottom of the spray chamber, and the condensed water flows out of the spray chamber through the drain port.

[0007] Further, the condensation unit includes a drainage plate disposed on the inner wall of the liquefaction chamber, and a heat exchange tube disposed inside the drainage plate.

[0008] Further, the drainage plate is composed of several guide plates. Vent holes with the same shape are opened at the tops of the guide plates at the same height, and the shapes of the vent holes of adjacent two layers of guide plates are different.

[0009] Further, the compression unit includes a cylinder sleeve disposed at the bottom end of the copper tube, a piston disposed on the inner wall of the cylinder sleeve, a connecting rod disposed at the bottom of the piston, a rotating arm disposed at the bottom of the connecting rod, a double-shaft motor disposed on the side of the rotating arm away from the spray chamber, the bottom of the double-shaft motor is fixedly connected to the inner wall of the bottom of the housing, a fan disposed on the side of the double-shaft motor away from the spray chamber, and a coil pipe disposed at the top of the cylinder sleeve. The top end of the coil pipe is fixedly connected to the top of the condensation unit.

[0010] Further, two one-way valves are provided at the top of the cylinder sleeve. The bottom end of the copper tube is fixedly connected to the top of the rear one-way valve, and the bottom end of the coil pipe is fixedly connected to the top of the front one-way valve.

[0011] Further, the middle part of the coil pipe is spiral, and the spiral position of the coil pipe is fixedly connected to the inner wall of the housing.

[0012] Further, the dust removal mechanism includes an impeller disposed on the side of the rotating arm close to the spray chamber, a bracket disposed outside the cylinder sleeve, a pump housing disposed at the bottom of the bracket, one side of the bracket close to the spray chamber is fixedly connected to the inner wall of the housing, a bent pipe disposed on the side of the pump housing close to the spray chamber, the top of the bent pipe is fixedly connected to the bottom of the liquefaction chamber, and a spray pipe disposed at the bottom of the pump housing.

[0013] Further, the middle part of the bent pipe is U-shaped, and a cross pipe is provided at the bottom of the U-shaped position of the bent pipe.

[0014] Another object of the present invention is to provide a method for treating the tail gas of a granulation tower used in the production of sulfur-based compound fertilizers, and the purpose is to separate the moisture and solid particles in the tail gas through tail gas treatment equipment.

[0015] To achieve the above object, the present invention provides the following technical solution: A method for treating the tail gas of a granulation tower used in the production of sulfur-based compound fertilizers, including the following steps: First, the tail gas enters the interior of the spray chamber through the air inlet, and then is washed by the water curtain generated by the dust removal mechanism to separate the carried solid impurities; Then, the washed tail gas enters the liquefaction chamber and contacts the condensation unit, and the moisture carried in the tail gas condenses upon cooling; Continuing, the condensed water droplets generated by cooling the tail gas through the dehumidification mechanism fall to the bottom of the liquefaction chamber; Finally, after the condensed water at the bottom of the liquefaction chamber is extracted by the dust removal mechanism, it is sprayed in the spray chamber to wash the subsequent tail gas.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up a dehumidification mechanism, the temperature of the tail gas is reduced, so that the moisture existing in the form of water vapor therein condenses into liquid water, thereby realizing the recycling of water resources. This process not only reduces the waste of water resources, but also reduces the moisture content in the tail gas, creating favorable conditions for the subsequent tail gas treatment process. The collected condensed water can be recycled and used in the production process, saving water resources. This measure helps to reduce the water consumption in the production process, lower the operating cost of the enterprise, and at the same time reduce the burden of wastewater treatment, realizing the effective utilization of water resources and the improvement of environmental protection benefits.

[0017] 2. By setting up a dust removal mechanism, the collected condensed water is sprayed into the tail gas. The water droplets contact the dust particles in the tail gas, capture and settle them, achieving the purpose of dust removal. Since the spray dust removal process uses the condensed water recovered during the tail gas treatment process, the need for additional water sources is reduced. This design not only removes the dust in the tail gas, but also utilizes the originally wasted moisture, simplifies the water treatment process, and reduces wastewater discharge.

[0018] 3. By setting up a drainage plate, the purpose is to optimize the collection and management of condensed water. The function of the drainage plate is to guide the flow of condensed water so that it converges at the bottom of the liquefaction chamber, avoiding the direct entry of condensed water into the spray chamber and interfering with the normal operation of spray dust removal. The design of the drainage plate enables the condensed water to be centrally collected, facilitating subsequent storage and utilization, improving the stability and reliability of equipment operation, ensuring the smooth progress of the tail gas treatment process, and at the same time creating favorable conditions for the recycling of condensed water. Description of the Drawings

[0019] Figure 1Schematic diagram of the overall three-dimensional structure of the tail gas treatment equipment of the present invention; Figure 2 Schematic diagram of the overall structure of the dehumidification mechanism of the tail gas treatment equipment of the present invention; Figure 3 Schematic diagram of the internal structure of the liquefaction chamber of the tail gas treatment equipment of the present invention; Figure 4 Cross-sectional view of the spray chamber of the tail gas treatment equipment of the present invention; Figure 5 Schematic diagram of the heat exchange tube and the drainage plate structure of the tail gas treatment equipment of the present invention; Figure 6 Schematic diagram of the coil pipe structure of the tail gas treatment equipment of the present invention; Figure 7 Schematic diagram of the connection between the double-shaft motor and the fan of the tail gas treatment equipment of the present invention; Figure 8 Schematic diagram of the structure of the rotating arm and the connecting rod of the tail gas treatment equipment of the present invention; Figure 9 Schematic diagram of the connection between the bracket and the pump housing and the cylinder liner of the tail gas treatment equipment of the present invention; Figure 10 Schematic diagram of the connection between the pump housing and the elbow pipe of the tail gas treatment equipment of the present invention; Figure 11 Schematic diagram of the nozzle structure of the tail gas treatment equipment of the present invention; Figure 12 Schematic diagram of the elbow pipe structure of the tail gas treatment equipment of the present invention.

[0020] In the figure: 1. Granulation tower main body; 2. Base; 3. Dehumidification mechanism; 4. Dust removal mechanism; 31. Spray chamber; 32. Liquefaction chamber; 33. Copper pipe; 34. Housing; 35. Air inlet; 36. Exhaust port; 37. Drainage port; 38. Drainage plate; 39. Heat exchange tube; 310. Cylinder liner; 311. Piston; 312. Connecting rod; 313. Rotating arm; 314. Double-shaft motor; 315. Fan; 316. Coil pipe; 41. Impeller; 42. Bracket; 43. Pump housing; 44. Elbow pipe; 45. Nozzle. Detailed implementation manners

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the following will make a detailed description of the specific implementation manners of the present invention with reference to the accompanying drawings of the specification.

[0022] Example 1, refer to Figures 1-12, which is the first embodiment of the present invention, provides a tail gas treatment device for the production of sulfur-based compound fertilizers, including a granulation tower main body 1, several bases 2 fixedly connected to the top of the granulation tower main body 1 in an annular array, and further including a dehumidification mechanism 3 installed on the top of the base 2 and a dust removal mechanism 4 installed inside the dehumidification mechanism 3 for cleaning the tail gas; the dehumidification mechanism 3 includes a spray chamber 31 fixedly connected to the top of the base 2, the interior of the spray chamber 31 can accommodate the tail gas and water, a liquefaction chamber 32 fixedly connected to the top of the spray chamber 31, the liquefaction chamber 32 can accommodate the condensed water, a condensation unit assembled on the inner wall of the liquefaction chamber 32 for condensing water vapor, a copper pipe 33 fixedly connected to the top of the condensation unit, a refrigerant circulation channel is formed inside the copper pipe 33, a compression unit assembled at the bottom end of the copper pipe 33 for pushing the refrigerant to flow, a housing 34 fixedly connected to the side of the spray chamber 31 close to the compression unit, the housing 34 provides protection for the components inside, an air inlet 35 fixedly connected to the side of the spray chamber 31 away from the compression unit, the tail gas enters the interior of the spray chamber 31 through the air inlet 35, an exhaust port 36 fixedly connected to the top of the liquefaction chamber 32, the tail gas is discharged through the exhaust port 36, and a drain port 37 fixedly connected to the bottom of the spray chamber 31, the condensed water flows out of the spray chamber 31 through the drain port 37.

[0023] Specifically, the base 2 provides stable support for the tail gas treatment device. The internal space of the spray chamber 31 can accommodate the mixture of the tail gas and the condensed water. The moisture exists in the tail gas in the form of a mixture of gaseous and vapor states, realizing the separation of solid particles in the tail gas. The liquefaction chamber 32 can accommodate the condensed water. The refrigerant moves to the cylinder sleeve 310 through the copper pipe 33. The housing 34 provides protection for the fan 315. The tail gas enters the interior of the spray chamber 31 through the air inlet 35 and is discharged through the exhaust port 36. After the tail gas is washed by the condensed water, it is discharged from the spray chamber 31 through the drain port 37.

[0024] Refer to Figures 3-5 , the condensation unit includes a drainage plate 38 fixedly connected to the inner wall of the liquefaction chamber 32 and a heat exchange tube 39 fixedly connected to the inner side of the drainage plate 38.

[0025] Specifically, the drainage plate 38 can guide the condensed water to flow towards the side wall of the liquefaction chamber 32, preventing the condensed water from directly falling into the spray chamber 31, and the drainage plate 38 can transfer heat. The heat exchange tube 39 can transfer the heat from the internal refrigerant and the external tail gas.

[0026] Refer to Figure 5 , the drainage plate 38 is composed of several guide plates. The top of the guide plates at the same height is provided with ventilation holes with the same shape, and the ventilation holes of adjacent two layers of guide plates have different shapes.

[0027] Specifically, the guide plate has the functions of draining and conducting heat, and can block the exhaust gas. By cooperating with the ventilation holes, it increases the length of the exhaust gas movement path, enabling the moisture in the exhaust gas to be fully condensed and thus separated.

[0028] Referring to Figures 3-9 , the compression unit includes a cylinder liner 310 fixedly connected to the bottom end of the copper tube 33, a piston 311 slidably connected to the inner wall of the cylinder liner 310, a connecting rod 312 rotatably connected to the bottom of the piston 311, a swing arm 313 rotatably connected to the bottom of the connecting rod 312, a dual-axis motor 314 fixedly connected to the side of the swing arm 313 away from the spray chamber 31, the bottom of the dual-axis motor 314 being fixedly connected to the inner wall of the bottom of the housing 34, a fan 315 fixedly connected to the side of the dual-axis motor 314 away from the spray chamber 31, and a coil pipe 316 fixedly connected to the top of the cylinder liner 310. The top end of the coil pipe 316 is fixedly connected to the top of the condensation unit.

[0029] Specifically, the piston 311 expands and contracts within the cylinder liner 310, enabling the interior of the cylinder liner 310 to cycle periodically between positive pressure and negative pressure, thereby driving the flow cycle of the refrigerant. The dual-axis motor 314 can drive the swing arm 313 to rotate. While the swing arm 313 rotates, it pushes the piston 311 to move through the connecting rod 312. After the dual-axis motor 314 starts, it drives the fan 315 to rotate. The airflow generated by the fan 315 blows towards the coil pipe 316, taking away the heat carried by the refrigerant inside the coil pipe 316 and its interior. The cooled refrigerant reflows into the interior of the heat exchange tube 39 under the action of the compression unit.

[0030] Referring to Figure 6 , two one-way valves are provided at the top of the cylinder liner 310. The bottom end of the copper tube 33 is fixedly connected to the top of the rear one-way valve, and the bottom end of the coil pipe 316 is fixedly connected to the top of the front one-way valve.

[0031] Specifically, the one-way valve near the rear of the cylinder liner 310 only allows the refrigerant to enter the cylinder liner 310, and the one-way valve near the front of the cylinder liner 310 only allows the refrigerant to flow out of the cylinder liner 310. When the pressure inside the cylinder liner 310 is negative, the refrigerant is sucked into the interior of the cylinder liner 310, and when the pressure inside the cylinder liner 310 is positive, the refrigerant is discharged to the coil pipe 316.

[0032] Referring to Figures 3-6 , the middle part of the coil pipe 316 is spiral, and the spiral position of the coil pipe 316 is fixedly connected to the inner wall of the housing 34.

[0033] Specifically, most of the spiral coil pipe 316 is within the flow area of the airflow of the fan 315, increasing the heat exchange area, and the inner wall of the housing 34 provides support for the coil pipe 316.

[0034] Example 2, referring to Figures 2-12, which is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the dust removal mechanism 4 includes an impeller 41 fixedly connected to the side of the swing arm 313 close to the spray chamber 31, a bracket 42 fixedly connected to the outer side of the cylinder liner 310, a pump housing 43 fixedly connected to the bottom of the bracket 42, one side of the bracket 42 close to the spray chamber 31 is fixedly connected to the inner wall of the housing 34, a bent pipe 44 fixedly connected to the side of the pump housing 43 close to the spray chamber 31, the top of the bent pipe 44 is fixedly connected to the bottom of the liquefaction chamber 32, and a spray pipe 45 fixedly connected to the bottom of the pump housing 43.

[0035] Specifically, the condensed water in the liquefaction chamber 32 enters the pump housing 43 through the bent pipe 44. The impeller 41 can rotate with the swing arm 313. While the impeller 41 rotates, the condensed water in the pump housing 43 is thrown to the side wall of the pump by centrifugal force. The condensed water is sprayed into the interior of the spray chamber 31 through the spray pipe 45. The sprayed condensed water is mixed with the tail gas passing through the spray chamber 31 and adsorbs the solid particles in the tail gas. Then the condensed water falls to the bottom of the spray chamber 31 and is discharged through the drain port 37.

[0036] Referring to Figure 12 , the middle of the bent pipe 44 is U-shaped, and a horizontal pipe is provided at the bottom of the U-shaped position of the bent pipe 44.

[0037] Specifically, when it is not necessary to clean the tail gas with condensed water, the condensed water can be discharged through the horizontal pipe, and the horizontal pipe is connected to an external water source to supply water to the dust removal mechanism 4, so as to adapt to different working conditions. The rest of the structure is the same as that of Embodiment 1.

[0038] Combining Embodiments 1-2, the working principle of the present invention is as follows: Start the dual-axis motor 314 to rotate the swing arm 313 and the fan 315. The swing arm 313 drives the piston 311 to move through the connecting rod 312. The piston 311 cooperates with the cylinder liner 310 to drive the refrigerant to circulate between the copper tube 33, the heat exchange tube 39, and the coil 316. While the fan 315 rotates, it generates an air flow that blows towards the coil 316, cooling the coil 316. Then, the tail gas is discharged. During the process of tail gas discharge, it enters the interior of the spray chamber 31 through the air inlet 35 and then enters the liquefaction chamber 32 upward, and finally is discharged through the exhaust port 36. During the process of the tail gas passing through the spray chamber 31, it passes through the water curtain ejected from the spray pipe 45. After the tail gas contacts the water curtain, the solid particles it carries are captured by the water curtain and fall to the bottom of the spray chamber 31 along with the water curtain, and finally are discharged through the drain port 37. After the cleaned tail gas enters the liquefaction chamber 32, it contacts the diversion plate 38 and the heat exchange tube 39. Since the heat exchange tube 39 is filled with refrigerant, its temperature is relatively low. After the tail gas contacts the diversion plate 38 and the heat exchange tube 39, the water vapor it carries condenses into liquid condensate. After the condensate converges into a certain volume, it drips along the diversion plate 38. After the tail gas passes through the condensation unit, the moisture it carries will be separated. While rotating, it drives the impeller 41 to rotate. At the same time, the impeller 41 pumps out the deposited condensate water inside the liquefaction chamber 32 through the elbow 44 and pumps it to the spray pipe 45. The spray pipe 45 sprays the condensate water into the interior of the spray chamber 31 to clean the tail gas passing through the spray chamber 31, thereby performing dust removal.

[0039] Embodiment 3, referring to Figures 1-10 , which is the third embodiment of the present invention, provides: A method for treating the tail gas of a granulation tower for producing sulfur-based compound fertilizer, including the following steps: S1. First, the tail gas enters the interior of the spray chamber 31 through the air inlet 35, and then is cleaned by the water curtain generated by the dust removal mechanism 4 to separate the solid impurities carried. The pollutants carried by the separated tail gas are reduced.

[0040] S2. The cleaned tail gas enters the liquefaction chamber 32 and contacts the condensation unit. The moisture carried in the tail gas condenses. Utilizing the condensate water will be more environmentally friendly.

[0041] S3. The condensed water droplets generated by cooling the tail gas by the dehumidification mechanism 3 fall to the bottom of the liquefaction chamber 32, and the collected condensed water will be used by the dust removal mechanism 4.

[0042] S4. Finally, after the condensed water at the bottom of the liquefaction chamber 32 is extracted by the dust removal mechanism 4, it is sprayed in the spray chamber 31 to clean the subsequent tail gas. Utilizing the moisture carried by the tail gas to clean the tail gas realizes the full utilization of water resources.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. An exhaust gas treatment device for a granulation tower in the production of sulfur-based compound fertilizers, comprising a granulation tower main body (1), and a number of bases (2) arranged in an annular array on the top of the granulation tower main body (1), characterized in that: It further includes a dehumidifying mechanism (3) arranged on the top of the base (2), and a dust removal mechanism (4) arranged inside the dehumidifying mechanism (3) for cleaning the tail gas; The dehumidifying mechanism (3) includes a spray chamber (31) arranged on the top of the base (2). The inside of the spray chamber (31) can accommodate the tail gas and water. A liquefaction chamber (32) is arranged on the top of the spray chamber (31). The liquefaction chamber (32) can accommodate condensed water. A condensation unit is arranged on the inner wall of the liquefaction chamber (32) for condensing water vapor. A copper tube (33) is arranged on the top of the condensation unit. A circulation channel for the refrigerant is formed inside the copper tube (33). A compression unit is arranged at the bottom end of the copper tube (33) for promoting the flow of the refrigerant. A housing (34) is arranged on one side of the spray chamber (31) close to the compression unit. The housing (34) provides protection for the components inside. An air inlet (35) is arranged on one side of the spray chamber (31) away from the compression unit. The tail gas enters the inside of the spray chamber (31) from the air inlet (35). An exhaust port (36) is arranged on the top of the liquefaction chamber (32). The tail gas is discharged through the exhaust port (36), and a drain port (37) is arranged at the bottom of the spray chamber (31). The condensed water flows out of the spray chamber (31) through the drain port (37).

2. The tail gas treatment equipment for the production of sulfur-based compound fertilizer granulation tower according to claim 1, characterized in that: The condensation unit includes a diversion plate (38) arranged on the inner wall of the liquefaction chamber (32), and a heat exchange tube (39) arranged inside the diversion plate (38).

3. The tail gas treatment equipment for granulation tower in the production of sulfur-based compound fertilizer according to claim 2, characterized in that: The diversion plate (38) is composed of several guide plates. Vent holes with the same shape are opened at the tops of the guide plates at the same height, and the shapes of the vent holes of adjacent two layers of guide plates are different.

4. The tail gas treatment equipment for the production of sulfur-based compound fertilizer granulation tower according to claim 1, characterized in that: The compression unit includes a cylinder sleeve (310) arranged at the bottom end of the copper tube (33), a piston (311) arranged on the inner wall of the cylinder sleeve (310), a connecting rod (312) arranged at the bottom of the piston (311), a rotating arm (313) arranged at the bottom of the connecting rod (312), a double-shaft motor (314) arranged on the side of the rotating arm (313) away from the spray chamber (31). The bottom of the double-shaft motor (314) is fixedly connected to the bottom inner wall of the housing (34). A fan (315) is arranged on the side of the double-shaft motor (314) away from the spray chamber (31), and a coil pipe (316) is arranged on the top of the cylinder sleeve (310). The top end of the coil pipe (316) is fixedly connected to the top of the condensation unit.

5. The tail gas treatment equipment for granulation tower in the production of sulfur-based compound fertilizer according to claim 4, characterized in that: Two one-way valves are arranged at the top of the cylinder sleeve (310). The bottom end of the copper tube (33) is fixedly connected to the top of the rear one-way valve, and the bottom end of the coil pipe (316) is fixedly connected to the top of the front one-way valve.

6. The tail gas treatment equipment for the production of sulfur-based compound fertilizer granulation tower according to claim 5, characterized in that: The middle part of the coil pipe (316) is spiral, and the spiral position of the coil pipe (316) is fixedly connected to the inner wall of the housing (34).

7. The tail gas treatment equipment for granulation tower in the production of sulfur-based compound fertilizer according to claim 1, characterized in that: The dust removal mechanism (4) includes an impeller (41) arranged on one side of the rotating arm (313) close to the spray chamber (31), a bracket (42) arranged outside the cylinder liner (310), a pump housing (43) arranged at the bottom of the bracket (42), one side of the bracket (42) close to the spray chamber (31) is fixedly connected to the inner wall of the housing (34), an elbow pipe (44) arranged on one side of the pump housing (43) close to the spray chamber (31), the top of the elbow pipe (44) is fixedly connected to the bottom of the liquefaction chamber (32), and a spray pipe (45) arranged at the bottom of the pump housing (43).

8. The tail gas treatment equipment for granulation tower in the production of sulfur-based compound fertilizer according to claim 7, characterized in that: The middle part of the elbow pipe (44) is U-shaped, and a horizontal pipe is arranged at the bottom of the U-shaped position of the elbow pipe (44).

9. A method for treating the tail gas of a granulation tower used in the production of sulfur-based compound fertilizers, which is applied to the tail gas treatment equipment of the granulation tower for the production of sulfur-based compound fertilizers according to any one of claims 1-8, characterized in that, It includes the following steps: First, the tail gas enters the interior of the spray chamber (31) through the air inlet (35), and then is washed by the water curtain generated by the dust removal mechanism (4) to separate the carried solid impurities; Then, the washed tail gas enters the liquefaction chamber (32) and contacts the condensation unit, and the moisture carried in the tail gas condenses upon cooling; Continuously, the condensed water droplets generated by cooling the tail gas by the dehumidification mechanism (3) fall on the bottom of the liquefaction chamber (32); Finally, the condensed water at the bottom of the liquefaction chamber (32) is extracted by the dust removal mechanism (4) and sprayed in the spray chamber (31) to wash the subsequent tail gas.

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