A granulation tower tail gas treatment device and method for sulfur-based compound fertilizer production

Abstract

The present invention relates to the technical field of tail gas treatment, and discloses a tail gas treatment device and method for a granulation tower for producing sulfur-based compound fertilizers. The tail gas treatment device comprises a granulation tower body, a plurality of bases arranged in an annular array at the top of the granulation tower body, a dehumidification mechanism arranged at the top of the base, and a dust removal mechanism arranged inside the dehumidification mechanism for cleaning the tail gas. The dehumidification mechanism comprises a spray chamber arranged at the top of the base, the interior of the spray chamber being capable of accommodating tail gas and water, a liquefaction chamber arranged at the top of the spray chamber being capable of accommodating condensed water, a condensation unit arranged on the inner wall of the liquefaction chamber for condensing water vapor, a copper tube arranged at the top of the condensation unit, the interior of the copper tube forming a refrigerant circulation channel, and a compression unit arranged at the bottom end of the copper tube for promoting the flow of the refrigerant. The provision of the dehumidification mechanism achieves water resource recycling and reduces the need for additional water sources.

Description

Technical Field

[0001] The present invention relates to the technical field of tail gas treatment, and in particular to a tail gas treatment device and method for a granulation tower used 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 discharge will pollute the atmospheric environment and endanger human health. Tail gas treatment equipment can effectively remove these pollutants and ensure that the emissions meet environmental standards.

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

[0004] In view of the problems in the existing technology that the tail gas treatment equipment cannot utilize the moisture in the tail gas and the dust removal process requires an additional water source, a granulation tower tail gas treatment equipment for sulfur-based compound fertilizer production is proposed.

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

[0006] The technical solution of the present invention is a granulation tower tail gas treatment device for sulfur-based compound fertilizer production, comprising a granulation tower body, a plurality of bases arranged in an annular array on the top of the granulation tower body, 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;

[0007] The dehumidification mechanism includes a spray chamber arranged on the top of the base, the interior of the spray chamber can accommodate exhaust gas and water, a liquefaction chamber arranged on the top of the spray chamber, the liquefaction chamber can accommodate condensed water, a condensation unit arranged on the inner wall of the liquefaction chamber for condensing water vapor, a copper tube arranged on the top of the condensation unit, a refrigerant circulation channel is formed inside the copper tube, a compression unit arranged at the bottom of the copper tube for promoting the flow of refrigerant, a cover arranged on the side of the spray chamber close to the compression unit, the cover provides protection for the components inside, an air inlet arranged on the side of the spray chamber away from the compression unit, the exhaust gas enters the interior of the spray chamber from the air inlet, an exhaust port arranged on the top of the liquefaction chamber, the exhaust gas is discharged through the exhaust port, and a drain port is arranged at the bottom of the spray chamber, the condensed water flows to the outside of the spray chamber through the drain port.

[0008] Furthermore, the condensing unit includes a guide plate arranged on the inner wall of the liquefaction chamber, and a heat exchange tube arranged on the inner side of the guide plate.

[0009] Furthermore, the guide plate is composed of a plurality of guide plates, the guide plates at the same level have vent holes with the same shape on the top, and the vent holes of the guide plates in two adjacent levels have different shapes.

[0010] Furthermore, the compression unit includes a cylinder sleeve arranged at the bottom end of the copper tube, a piston arranged on the inner wall of the cylinder sleeve, a connecting rod arranged at the bottom of the piston, a swing arm arranged at the bottom of the connecting rod, a dual-axis motor arranged on the side of the swing arm away from the spray chamber, the bottom of the dual-axis motor is fixedly connected to the bottom inner wall of the cover, a fan arranged on the side of the dual-axis motor away from the spray chamber, and a coil arranged at the top of the cylinder sleeve, and the top of the coil is fixedly connected to the top of the condensing unit.

[0011] Furthermore, two one-way valves are provided on the top of the cylinder sleeve, the bottom end of the copper tube is fixedly connected to the top of the one-way valve at the rear, and the bottom end of the coil is fixedly connected to the top of the one-way valve at the front.

[0012] Furthermore, the middle portion of the coil is spiral, and the spiral portion of the coil is fixedly connected to the inner wall of the housing.

[0013] Furthermore, the dust removal mechanism includes an impeller arranged on the side of the rotary arm close to the spray chamber, a bracket arranged on the outside of the cylinder liner, a pump casing arranged at the bottom of the bracket, the side of the bracket close to the spray chamber is fixedly connected to the inner wall of the cover casing, a bent pipe arranged on the side of the pump casing close to the spray chamber, the top of the bent pipe is fixedly connected to the bottom of the liquefaction chamber, and a nozzle arranged at the bottom of the pump casing.

[0014] Furthermore, the middle portion of the curved pipe is U-shaped, and a transverse pipe is provided at the bottom of the U-shaped portion of the curved pipe.

[0015] Another object of the present invention is to provide a method for treating tail gas from a granulation tower used in the production of sulfur-based compound fertilizers, the purpose of which is to separate moisture and solid particles in the tail gas through the tail gas treatment equipment.

[0016] To achieve the above object, the present invention provides the following technical solution: a method for treating tail gas from a granulation tower used in the production of sulfur-based compound fertilizers, comprising the following steps:

[0017] First, the exhaust gas enters the spray chamber through the air inlet, and then passes through the water curtain generated by the dust removal mechanism to separate the solid impurities it carries;

[0018] Then, the cleaned tail gas enters the liquefaction chamber and comes into contact with the condensation unit, where the moisture carried in the tail gas condenses when it encounters cold.

[0019] Continuing, the condensed water produced by the exhaust gas cooling down by the dehumidification mechanism drops to the bottom of the liquefaction chamber;

[0020] Finally, the condensed water at the bottom of the liquefaction chamber is extracted by the dust removal mechanism and sprayed out in the spray chamber to clean the subsequent exhaust gas.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. By setting up a dehumidification mechanism, the exhaust gas temperature is lowered, and the water in the form of water vapor is condensed 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 exhaust gas, creating favorable conditions for subsequent exhaust gas treatment processes. The collected condensed water can be recycled in the production process, saving water resources. This measure helps to reduce water resource consumption in the production process, reduce the operating costs of the enterprise, and at the same time reduce the burden of wastewater treatment, thereby realizing the effective utilization of water resources and improving environmental benefits.

[0023] 2. By setting up a dust removal mechanism, the collected condensed water is sprayed into the exhaust gas. The water droplets come into contact with the dust particles in the exhaust gas, capture them and settle them down to achieve the purpose of dust removal. Since the spray dust removal process utilizes the condensed water recovered during the exhaust gas treatment process, the demand for additional water sources is reduced. This design not only removes dust from the exhaust gas, but also utilizes the water that was originally discarded, simplifies the water treatment process, and reduces wastewater discharge.

[0024] 3. The purpose of setting up the drainage plate 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 gathers at the bottom of the liquefaction chamber, avoiding the condensed water from directly entering the spray chamber and interfering with the normal operation of the spray dust removal. The design of the drainage plate allows the condensed water to be collected in a centralized manner, which is convenient for subsequent storage and utilization, improves the stability and reliability of the equipment operation, ensures the smooth progress of the exhaust gas treatment process, and at the same time, creates favorable conditions for the recycling of condensed water. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the overall three-dimensional structure of the exhaust gas treatment equipment of the present invention;

[0026] Figure 2 This is a schematic diagram of the overall structure of the dehumidification mechanism of the tail gas treatment equipment of the present invention;

[0027] Figure 3 This is a schematic diagram of the internal structure of the liquefaction chamber of the tail gas treatment equipment of the present invention;

[0028] Figure 4 A cross-sectional view of a spray chamber of an exhaust gas treatment device according to the present invention;

[0029] Figure 5 This is a schematic diagram of the heat exchange tube and guide plate structure of the tail gas treatment equipment of the present invention;

[0030] Figure 6 This is a schematic diagram of the coil structure of the exhaust gas treatment equipment of the present invention;

[0031] Figure 7 This is a schematic diagram of the connection between the dual-shaft motor and the fan of the exhaust gas treatment equipment of the present invention;

[0032] Figure 8 This is a schematic diagram of the rotary arm and connecting rod structure of the exhaust gas treatment equipment of the present invention;

[0033] Figure 9 This is a schematic diagram of the connection between the bracket, pump casing and cylinder liner of the exhaust gas treatment equipment of the present invention;

[0034] Figure 10 This is a schematic diagram of the connection between the pump housing and the elbow of the exhaust gas treatment equipment of the present invention;

[0035] Figure 11 This is a schematic diagram of the nozzle structure of the exhaust gas treatment equipment of the present invention;

[0036] Figure 12 This is a schematic diagram of the elbow structure of the tail gas treatment equipment of the present invention.

[0037] In the picture:

[0038] 1. Granulating tower body; 2. Base; 3. Dehumidification mechanism; 4. Dust removal mechanism; 31. Spray chamber; 32. Liquefaction chamber; 33. Copper tube; 34. Cover; 35. Air inlet; 36. Exhaust port; 37. Drain port; 38. Drain plate; 39. Heat exchange tube; 310. Cylinder liner; 311. Piston; 312. Connecting rod; 313. Swing arm; 314. Dual-axis motor; 315. Fan; 316. Coil; 41. Impeller; 42. Bracket; 43. Pump casing; 44. Elbow; 45. Nozzle. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0040] Example 1, reference Figures 1-12 , which is the first embodiment of the present invention, provides a granulation tower tail gas treatment equipment for sulfur-based compound fertilizer production, including a granulation tower body 1, a plurality of annular arrays fixedly connected to the base 2 on the top of the granulation tower body 1, 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 spray chamber 31 can accommodate tail gas and water, a liquefaction chamber 32 fixedly connected to the top of the spray chamber 31, the liquefaction chamber 32 can accommodate condensed water, a condensation unit installed on the inner wall of the liquefaction chamber 32 for condensing water vapor, and a condensation unit fixedly connected to the cold The copper tube 33 at the top of the condensing unit forms a refrigerant circulation channel inside the copper tube 33. A compression unit is installed at the bottom of the copper tube 33 to promote the flow of refrigerant. The cover 34 is fixedly connected to the spray chamber 31 on the side close to the compression unit. The cover 34 provides protection for the internal components. The air inlet 35 is fixedly connected to the spray chamber 31 on the side away from the compression unit. The exhaust gas enters the spray chamber 31 from the air inlet 35. The exhaust port 36 is fixedly connected to the top of the liquefaction chamber 32. The exhaust gas is discharged through the exhaust port 36. The drain port 37 is fixedly connected to the bottom of the spray chamber 31. The condensed water flows to the outside of the spray chamber 31 through the drain port 37.

[0041] Specifically, the base 2 provides stable support for the exhaust gas treatment equipment. The internal space of the spray chamber 31 can accommodate a mixture of exhaust gas and condensed water. Water exists in the exhaust gas in the form of a mixture of gas and steam, thereby realizing the separation of solid particles in the exhaust gas. The liquefaction chamber 32 can accommodate condensed water. The refrigerant moves to the cylinder liner 310 through the copper tube 33. The cover 34 provides protection for the fan 315. The exhaust gas enters the interior of the spray chamber 31 through the air inlet 35 and is discharged through the exhaust port 36. After the condensed water cleans the exhaust gas, it is discharged from the spray chamber 31 through the drain port 37.

[0042] Reference Figure 3-Figure 5 The condensing unit includes a guide 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 guide plate 38 .

[0043] Specifically, the guide plate 38 can guide the condensed water to flow toward the side wall of the liquefaction chamber 32 to prevent the condensed water from falling directly into the spray chamber 31, and the guide plate 38 can transfer heat, and the heat exchange tube 39 can transfer heat from the internal refrigerant and the external exhaust gas.

[0044] Reference Figure 5The guide plate 38 is composed of several guide plates. The tops of the guide plates at the same height have vents with the same shape, and the vents of the two adjacent guide plates have different shapes.

[0045] Specifically, the guide plate has the function of guiding and conducting heat, and the guide plate can block the exhaust gas, and by cooperating with the vent hole, the length of the exhaust gas movement path is increased, so that the moisture in the exhaust gas can be fully condensed and thus separated.

[0046] Reference Figure 3-Figure 9 The compression unit includes a cylinder sleeve 310 fixedly connected to the bottom end of the copper tube 33, a piston 311 slidably connected to the inner wall of the cylinder sleeve 310, a connecting rod 312 rotatably connected to the bottom of the piston 311, a rotary arm 313 rotatably connected to the bottom of the connecting rod 312, a dual-axis motor 314 fixedly connected to the side of the rotary arm 313 away from the spray chamber 31, the bottom of the dual-axis motor 314 is fixedly connected to the bottom inner wall of the cover 34, a fan 315 fixedly connected to the side of the dual-axis motor 314 away from the spray chamber 31, and a coil 316 fixedly connected to the top of the cylinder sleeve 310, and the top of the coil 316 is fixedly connected to the top of the condensing unit.

[0047] Specifically, the piston 311 extends and contracts in the cylinder liner 310, which can cause the interior of the cylinder liner 310 to cyclically cycle between positive pressure and negative pressure, thereby driving the flow circulation of the refrigerant. The dual-axis motor 314 can drive the rotary arm 313 to rotate. While the rotary arm 313 rotates, it pushes the piston 311 to move through the connecting rod 312. After starting, the dual-axis motor 314 can drive the fan 315 to rotate. The airflow generated by the fan 315 blows the coil 316, so that the heat carried by the coil 316 and the refrigerant therein is taken away, and the cooled refrigerant flows back to the interior of the heat exchange tube 39 under the action of the compression unit.

[0048] Reference Figure 6 Two one-way valves are provided on the top of the cylinder sleeve 310. The bottom end of the copper tube 33 is fixedly connected to the top of the one-way valve at the rear, and the bottom end of the coil 316 is fixedly connected to the top of the one-way valve at the front.

[0049] 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 cylinder liner 310, and when the pressure inside the cylinder liner 310 is positive, the refrigerant is discharged to the coil 316.

[0050] Reference Figure 3-Figure 6 The middle portion of the coil 316 is spiral, and the spiral position of the coil 316 is fixedly connected to the inner wall of the cover 34.

[0051] Specifically, most of the spiral coil 316 is located within the flow area of ​​the fan 315 , thereby increasing the heat exchange area, and the inner wall of the cover 34 provides support for the coil 316 .

[0052] Example 2, reference Figure 2-Figure 12 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the dust removal mechanism 4 includes an impeller 41 fixedly connected to the side of the rotary arm 313 close to the spray chamber 31, a bracket 42 fixedly connected to the outside of the cylinder sleeve 310, a pump casing 43 fixedly connected to the bottom of the bracket 42, the side of the bracket 42 close to the spray chamber 31 is fixedly connected to the inner wall of the cover casing 34, a bend 44 fixedly connected to the side of the pump casing 43 close to the spray chamber 31, the top of the bend 44 is fixedly connected to the bottom of the liquefaction chamber 32, and a nozzle 45 fixedly connected to the bottom of the pump casing 43.

[0053] Specifically, the condensed water in the liquefaction chamber 32 enters the pump casing 43 through the bent pipe 44, and the impeller 41 can rotate with the rotary arm 313. While the impeller 41 rotates, the condensed water in the pump casing 43 is thrown toward the side wall of the pump through centrifugal force. The condensed water is sprayed into the interior of the spray chamber 31 through the nozzle 45. The sprayed condensed water mixes with the exhaust gas passing through the spray chamber 31 and absorbs solid particles in the exhaust gas. Then the condensed water falls to the bottom of the spray chamber 31 and is discharged through the drain port 37.

[0054] Reference Figure 12 The middle portion of the curved pipe 44 is U-shaped, and a horizontal pipe is provided at the bottom of the U-shaped portion of the curved pipe 44 .

[0055] Specifically, when there is no need to clean the exhaust gas with condensed water, the condensed water can be discharged through the transverse pipe, and the transverse pipe can be connected to an external water source to supply water to the dust removal mechanism 4, so that it can adapt to different working conditions. The rest of the structure is the same as that of Example 1.

[0056] Based on Examples 1-2, the working principle of the present invention is as follows: the dual-axis motor 314 is started to rotate the rotary arm 313 and the fan 315, and the rotary arm 313 drives the piston 311 to move through the connecting rod 312. The piston 311 cooperates with the cylinder sleeve 310 to drive the condenser to circulate between the copper tube 33, the heat exchange tube 39 and the coil 316. When the fan 315 rotates, an air flow is generated to blow toward the coil 316, so that the coil 316 is cooled, and then the exhaust gas is discharged. During the exhaust gas discharge process, the exhaust gas enters the interior of the spray chamber 31 through the air inlet 35, and enters the liquefaction chamber 32 upward, and is finally discharged through the exhaust port 36. In the process of passing through the spray chamber 31, the exhaust gas passes through the water curtain sprayed by the nozzle 45. After the exhaust gas contacts the water curtain, the solid particles carried by the exhaust gas are captured by the water curtain and are discharged along with the water curtain. It falls at the bottom of the spray chamber 31 and is finally discharged through the drain port 37. After the cleaned tail gas enters the liquefaction chamber 32, it contacts the guide plate 38 and the heat exchange tube 39. Since the heat exchange tube 39 is filled with a condensing agent, the temperature is relatively low. After the tail gas contacts the guide plate 38 and the heat exchange tube 39, the water vapor carried therein is condensed into liquid condensed water when it is cooled. After the condensed water gathers into a certain volume, it drips along the guide plate 38. After the tail gas passes through the condensation unit, the water it carries will be separated and the rotation will drive the impeller 41 to rotate. At the same time, the impeller 41 extracts the deposited condensed water inside the liquefaction chamber 32 through the bend pipe 44 and pumps it to the nozzle 45. The nozzle 45 sprays the condensed water into the interior of the spray chamber 31 to clean the tail gas passing through the spray chamber 31, thereby removing dust.

[0057] Example 3, reference Figures 1-10 , which is a third embodiment of the present invention, provides: a method for treating tail gas from a granulation tower used in the production of sulfur-based compound fertilizers, comprising the following steps:

[0058] S1, first, the tail gas enters 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 by it. The pollutants carried by the separated tail gas are reduced.

[0059] S2, the cleaned tail gas enters the liquefaction chamber 32 and contacts the condensation unit. The water carried in the tail gas condenses when it is cold. Utilizing the condensed water will be more environmentally friendly.

[0060] S3, the condensed water generated by the exhaust gas cooled by the dehumidification mechanism 3 drops to the bottom of the liquefaction chamber 32, and the collected condensed water will be used by the dust removal mechanism 4.

[0061] S4. Finally, the condensed water at the bottom of the liquefaction chamber 32 is extracted by the dust removal mechanism 4 and sprayed out in the spray chamber 31 to clean the subsequent exhaust gas. The exhaust gas is cleaned with the moisture carried by the exhaust gas, thereby fully utilizing water resources.

[0062] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A granulation tower tail gas treatment device for sulfur-based compound fertilizer production, comprising a granulation tower body (1), a plurality of annular arrays arranged on a base (2) at the top of the granulation tower body (1), characterized in that: It also includes a dehumidification mechanism (3) disposed on the top of the base (2), and a dust removal mechanism (4) disposed inside the dehumidification mechanism (3) for cleaning exhaust gas; The dehumidification mechanism (3) includes a spray chamber (31) arranged on the top of the base (2), the spray chamber (31) can accommodate exhaust gas and water, a liquefaction chamber (32) arranged on the top of the spray chamber (31), the liquefaction chamber (32) can accommodate condensed water, a condensation unit arranged on the inner wall of the liquefaction chamber (32) for condensing water vapor, a copper tube (33) arranged on the top of the condensation unit, the copper tube (33) forming a circulation channel for the refrigerant, a compression unit arranged at the bottom end of the copper tube (33) for promoting the flow of the refrigerant, and a condensation unit arranged on the inner wall of the liquefaction chamber (32) for condensing water vapor. The shower chamber (31) has a cover (34) on one side close to the compression unit, and the cover (34) provides protection for the components inside. An air inlet (35) is provided on the side of the shower chamber (31) away from the compression unit, and exhaust gas enters the shower chamber (31) from the air inlet (35). An exhaust port (36) is provided on the top of the liquefaction chamber (32), and exhaust gas is discharged through the exhaust port (36). A drain port (37) is provided at the bottom of the shower chamber (31), and condensed water flows to the outside of the shower chamber (31) through the drain port (37); The condensing unit includes a guide plate (38) arranged on the inner wall of the liquefaction chamber (32), and a heat exchange tube (39) arranged on the inner side of the guide plate (38); The guide plate (38) is composed of a plurality of guide plates. The guide plates at the same level have vent holes with the same shape on their tops, and the vent holes of the guide plates at two adjacent levels have different shapes.

2. The granulation tower tail gas treatment equipment for sulfur-based compound fertilizer production according to claim 1, characterized in that: The compression unit comprises 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 rotary arm (313) arranged at the bottom of the connecting rod (312), a dual-axis motor (314) arranged on the side of the rotary arm (313) away from the spray chamber (31), the bottom of the dual-axis motor (314) is fixedly connected to the bottom inner wall of the cover (34), a fan (315) is arranged on the side of the dual-axis motor (314) away from the spray chamber (31), and a coil (316) arranged at the top of the cylinder sleeve (310), the top of the coil (316) is fixedly connected to the top of the condensing unit.

3. The granulation tower tail gas treatment equipment for sulfur-based compound fertilizer production according to claim 2, characterized in that: Two one-way valves are provided on 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 (316) is fixedly connected to the top of the front one-way valve.

4. The granulation tower tail gas treatment equipment for sulfur-based compound fertilizer production according to claim 3, characterized in that: The middle portion of the coil (316) is spiral-shaped, and the spiral position of the coil (316) is fixedly connected to the inner wall of the cover (34).

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

6. The granulation tower tail gas treatment equipment for sulfur-based compound fertilizer production according to claim 5, characterized in that: The middle portion of the curved pipe (44) is U-shaped, and a transverse pipe is provided at the bottom of the U-shaped portion of the curved pipe (44).

7. A method for treating tail gas from a granulation tower for producing sulfur-based compound fertilizers, applied to the tail gas treatment equipment for a granulation tower for producing sulfur-based compound fertilizers according to claim 1, characterized in that: The following steps are involved: First, the exhaust gas enters the spray chamber (31) through the air inlet (35), and then passes through the water curtain generated by the dust removal mechanism (4) to separate the solid impurities carried by it; Then, the cleaned tail gas enters the liquefaction chamber (32) and contacts the condensation unit, where the water carried in the tail gas condenses when it encounters cold. Continue; the condensed water generated by the exhaust gas cooling by the dehumidification mechanism (3) drops to 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 out in the spray chamber (31) to clean the subsequent tail gas.

8. The method for treating tail gas from a granulation tower for producing sulfur-based compound fertilizer according to claim 7, wherein: After the tail gas is processed by the dust removal mechanism (4) and the dehumidification mechanism (3), the moisture and solid impurities carried by the tail gas are separated, making it easier to carry out subsequent processing.

Images