SA reaction system drying and cleaning process

Abstract

The present application relates to the technical field of chemical production, in particular to a SA reaction system drying and purifying process, through the steam heating structure combined with the chamber in the SA drying device in the SA reaction system drying and purifying process, the steam can be uniformly distributed to the chamber, the temperature of each part of the inner barrel wall is basically consistent, so that the ammonium sulfate crystals in the barrel that need to be dried are more uniformly and fully heated and dried, and then the screening and material lifting structure continuously lifts and spreads these ammonium sulfate crystals, further making these ammonium sulfate crystals more uniformly and fully heated and dried, and at the same time, the finer ammonium sulfate crystals pass through the net cylinder and fall into the inside of the net cylinder, achieving the screening effect, realizing the integrated operation of drying and screening ammonium sulfate crystals, and improving the production efficiency.

Description

Technical Field

[0001] This invention relates to the technical field of chemical production, specifically to the drying and purification process of SA reaction systems. Background Technology

[0002] Ammonium sulfate (abbreviated SA), with the chemical formula (NH4)2SO4, is a colorless, odorless, transparent crystalline solid. Industrially, it is usually produced as white or pale yellow granules, primarily through the reaction of synthetic ammonia with sulfuric acid. It is also a byproduct of industrial production processes such as coking, fertilizer production, and power plant desulfurization. In practical applications, ammonium sulfate is mainly used as a fertilizer, suitable for various soils and crops. It promotes vigorous growth of branches and leaves, improves fruit quality and yield, and is also used in textiles, leather, and pharmaceuticals. As a commonly used inorganic compound, its market demand is increasing year by year.

[0003] In the SA reaction production process, the post-processing of the finished product is crucial. As the final quality optimization step, drying directly determines the quality grade of ammonium sulfate products, the production efficiency of enterprises, and the utilization efficiency of energy resources through its process level and heating method. Currently, most ammonium sulfate production enterprises have not yet been equipped with professional drying and purification systems, resulting in frequent problems such as insufficient drying of materials and residual impurities, which seriously affect the quality stability and purity of the finished ammonium sulfate products. A few enterprises that have introduced drying equipment still generally use the traditional method of electric heating.

[0004] In traditional electric heating methods, box dryers are commonly used. While widely applied in general industrial production, box dryers have revealed several drawbacks in material handling within SA reaction systems. Box dryers employ a static drying method, converting electrical energy into heat energy through heating elements such as resistance wires, which is then transferred to the material. Although this method results in rapid heating, it suffers from uneven heating. During the drying process, materials near the heating elements are prone to deterioration and carbonization due to localized overheating, while materials further away may not dry sufficiently, leading to incomplete drying of the final ammonium sulfate product.

[0005] Secondly, during the SA reaction production process, the ammonium sulfate crystals produced have uneven particle size. In order to facilitate different production needs in the future, the ammonium sulfate crystals are usually dried and then screened using screening equipment. Since two separate steps of drying and screening are required, the drying and screening operations of ammonium sulfate crystals are cumbersome and reduce production efficiency. Summary of the Invention

[0006] The present invention aims to provide a drying and purification process for SA reaction systems, which can more uniformly and fully dry ammonium sulfate crystals and improve production efficiency.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: 1) The drying and purification process of the SA reaction system includes the following steps: Step 1, Preheating: Start the SA drying device for preheating; Step 2, Feeding: Add the ammonium sulfate crystals to be dried to the SA drying unit; Step 3, Screening and Drying: The ammonium sulfate crystals to be dried are continuously lifted and scattered by the screening and lifting structure in the SA drying device for drying, while screening is carried out at the same time, finally obtaining coarse ammonium sulfate crystals and fine ammonium sulfate crystals. Step 4: Packaging and Storage: Fill coarse and fine ammonium sulfate crystals into separate packaging bags and seal them, or further sieve and then package and seal them as needed, and store them in a dry, ventilated and dark place.

[0008] In this invention, the SA drying device is preheated in step one to raise the internal temperature to a predetermined drying temperature, ensuring that the ammonium sulfate crystals to be dried in subsequent steps are heated and dried during feeding, thus improving drying efficiency. In step three, the ammonium sulfate crystals to be dried are continuously lifted and scattered by a screening and lifting structure, keeping them dispersed and constantly tumbling during the drying process. This dynamic process not only ensures more uniform and sufficient heating of the ammonium sulfate crystals, reducing the problem of local overheating or insufficient drying, but also simultaneously achieves screening of these crystals, separating them into different sizes during the scattering process. Thus, the drying and screening processes are completed simultaneously in a single device, integrating the originally independent drying and screening processes into a single operation. This integrated design simplifies the production process, reduces equipment investment and floor space, effectively improves the overall efficiency of the entire production system, and has strong advantages for industrial application.

[0009] 2) According to the SA reaction system drying and purification process described in 1), wherein: The SA drying device includes a fixed base, on which several fixed frames are fixedly connected. An inclined barrel is fixedly connected to the fixed frames. The barrel includes an inner barrel wall and an outer barrel wall. There is a sealed chamber between the inner barrel wall and the outer barrel wall. A steam heating structure for heating is provided in the chamber. A screening and material-lifting structure for screening and lifting is provided in the barrel. The upper end of the inclined barrel is connected to a feed pipe. The other end of the barrel is connected to a first discharge pipe for coarse ammonium sulfate crystals and a second discharge pipe for fine ammonium sulfate crystals. In step one, the steam heating structure is activated to preheat the inner barrel wall. In step two, the ammonium sulfate crystals to be dried are added into the barrel through the feed pipe. In step three, the screening and sifting structure is activated to lift and scatter the ammonium sulfate crystals to be dried for drying, while screening is performed at the same time. Finally, coarse ammonium sulfate crystals are discharged from the first discharge pipe, and fine ammonium sulfate crystals are discharged from the second discharge pipe.

[0010] In this invention, the steam heating structure within the chamber is activated to preheat the inner barrel wall to an effective drying temperature, simultaneously raising the temperature of the internal environment. Then, ammonium sulfate crystals to be dried are added into the barrel through the feed pipe. The screening and sifting structure is activated to lift and scatter the ammonium sulfate crystals for drying and screening. By lifting and scattering the ammonium sulfate crystals, they are made to contact the inner barrel wall more evenly and be heated more thoroughly, achieving a more uniform and complete drying effect. Furthermore, by simultaneously performing drying and screening, the process is simplified, improving production efficiency. During the drying and screening process, because the barrel is tilted, the ammonium sulfate crystals continuously move along the tilt direction towards the first and second discharge pipes within the barrel. Finally, the coarse and fine ammonium sulfate crystals obtained after drying and screening are discharged through the first and second discharge pipes, respectively.

[0011] 3) According to the SA reaction system drying and purification process described in 2), wherein: The steam heating structure includes a steam generator, an outlet of the steam generator connected to an outlet pipe, an outlet pipe passing through a chamber and connected to a spiral steam pipe, the steam pipe being fixedly connected to the chamber, the steam pipe having several steam holes, and the chamber being connected to an exhaust pipe for steam discharge and a drain pipe for condensate discharge. In step one, the steam generator is started, and the steam generated by the steam generator enters the steam pipe through the outlet pipe, and then is injected into the chamber through the steam hole on the steam pipe, so that the inner barrel wall is heated evenly for preheating. In step three, the inner barrel wall is continuously heated to dry the ammonium sulfate crystals that need to be dried.

[0012] In this invention, after the steam generator is started, the steam generated by the steam generator enters the steam pipe through the outlet pipe and is then sprayed into the chamber through the steam holes on the steam pipe, thereby raising the temperature of the inner barrel wall to reach the effective drying temperature and increasing the temperature of the internal environment of the barrel. In step three, steam is continuously sprayed into the chamber to maintain the temperature of the inner barrel wall and dry the ammonium sulfate crystals that need to be dried. Since the steam pipe is fixedly connected to the chamber in a spiral structure, the steam sprayed from the steam holes on the steam pipe can be distributed more evenly in the chamber, so that the temperature of each part of the inner barrel wall is basically the same, thereby making the ammonium sulfate crystals that need to be dried more evenly heated and dried. During the above process, excess steam in the chamber is discharged from the exhaust pipe, and the condensate generated by the cooling of the steam in the chamber is discharged from the drain pipe.

[0013] 4) According to the SA reaction system drying and purification process described in 3), wherein: The screening and material-lifting structure includes a screen cylinder set inside the barrel, with both ends of the screen cylinder slidably connected to both ends of the barrel. Several material-lifting plates are fixedly connected to both the inner and outer sides of the screen cylinder. It also includes a drive component for driving the screen cylinder to rotate. In step three, the drive component is activated to drive the screen cylinder to rotate. The screen cylinder drives the material-lifting plates to rotate. During the rotation of the material-lifting plates, the material-lifting plates lift up and sprinkle the ammonium sulfate crystals that need to be dried for drying. At the same time, the finer ammonium sulfate crystals pass through the screen cylinder and fall into the inside of the screen cylinder.

[0014] In this invention, when the drive unit is activated to rotate the screen cylinder, the screen cylinder drives the lifting plate to rotate, lifting and scattering the ammonium sulfate crystals that need to be dried. This allows the ammonium sulfate crystals to be heated and dried more evenly and fully. At the same time, the finer ammonium sulfate crystals pass through the screen cylinder and fall into the inside of the screen cylinder, achieving a screening effect. Since the finer ammonium sulfate crystals are easier to dry than the coarser ones, after screening, the coarser ammonium sulfate crystals are more likely to come into direct contact with the inner wall of the screen cylinder and be heated and dried, while the finer ammonium sulfate crystals are dried inside the screen cylinder due to the high temperature of the internal environment of the barrel. Therefore, screening and drying can achieve a good drying effect for ammonium sulfate crystals of different sizes. By simultaneously drying and screening these ammonium sulfate crystals, the process is simplified and production efficiency is improved.

[0015] 5) According to the SA reaction system drying and purification process described in 4), wherein: It also includes a blower, the blower's air outlet is connected to an air supply pipe, the air supply pipe passes through the chamber and is connected to a preheating air pipe with a spiral structure, the preheating air pipe is fixedly connected to the chamber, the other end of the preheating air pipe passes out of the chamber and is connected to a connecting pipe, the connecting pipe is rotatably connected to and connected to a ventilation pipe, the ventilation pipe passes through the barrel and is located inside the mesh cylinder, the ventilation pipe is rotatably connected to the barrel, the ventilation pipe is connected to several ventilation branch pipes, the ventilation branch pipes pass through the mesh cylinder and are fixedly connected to the mesh cylinder, the ventilation pipe and ventilation branch pipes have several ventilation holes, and the driving component is used to drive the ventilation pipe to rotate; In step one, the blower is started, and air is forced from the air supply pipe into the preheating air pipe. As the air flows through the preheating air pipe, it is heated by the steam in the chamber and becomes hot air. Then, it enters the ventilation pipe through the connecting pipe and enters the barrel and mesh cylinder through the ventilation holes on the ventilation pipe and ventilation branch pipe for preheating. In step three, the blower continuously supplies hot air to the barrel and mesh cylinder. At the same time, the motor is started to drive the ventilation pipe to rotate, which causes the ventilation branch pipe on the ventilation pipe to drive the mesh cylinder to rotate. The mesh cylinder drives the lifting plate to rotate, lifting up and scattering the ammonium sulfate crystals that need to be dried for drying. Meanwhile, the finer ammonium sulfate crystals pass through the mesh cylinder and fall into the inside of the mesh cylinder.

[0016] In this invention, after the blower is started, it forces air from the air supply pipe into the preheating air pipe. As the air flows through the preheating air pipe, it is heated by the steam in the chamber, becoming hot air. This hot air then enters the ventilation pipe through the connecting pipe, and through the ventilation holes on the ventilation pipe and branch pipes, it enters the barrel and mesh cylinder, filling them with hot air. When the motor drives the ventilation pipe to rotate, the branch pipes on the ventilation pipe rotate the mesh cylinder, which in turn rotates the lifting plate, lifting and scattering the ammonium sulfate crystals to be dried. Simultaneously, finer ammonium sulfate crystals pass through the mesh cylinder and fall inside, achieving a sieving effect. The hot air flowing inside the barrel and mesh cylinder ensures that the ammonium sulfate crystals are heated more evenly and removes the water vapor evaporated during drying, thus improving the drying efficiency.

[0017] 6) According to the SA reaction system drying and purification process described in 5), wherein: The driving component includes a motor bracket fixedly connected to a fixed base, a motor mounted on the motor bracket, a first bevel gear fixedly connected to the output shaft of the motor, a second bevel gear meshing with the first bevel gear, and a ventilation duct fixedly connected to the second bevel gear. In step three, the motor is started to drive the first bevel gear to rotate, the first bevel gear drives the second bevel gear to rotate, the second bevel gear drives the ventilation pipe to rotate, the ventilation branch pipe on the ventilation pipe drives the mesh cylinder to rotate, the mesh cylinder drives the lifting plate to rotate, lifting up and scattering the ammonium sulfate crystals that need to be dried for drying, while the finer ammonium sulfate crystals pass through the mesh cylinder and fall into the inside of the mesh cylinder.

[0018] In this invention, after the motor is started, the motor drives the first bevel gear to rotate, the first bevel gear drives the second bevel gear to rotate, the second bevel gear drives the ventilation pipe to rotate, causing the ventilation branch pipe on the ventilation pipe to drive the screen cylinder to rotate, and the screen cylinder drives the lifting plate to rotate, lifting and scattering the ammonium sulfate crystals that need to be dried, promoting more uniform and sufficient heating and drying of these ammonium sulfate crystals. During the rotation of the ventilation pipe and ventilation branch pipe, the hot air sprayed from the ventilation holes is more evenly distributed into the screen cylinder and the barrel, further enabling these ammonium sulfate crystals to be heated and dried more evenly and fully. At the same time, the finer ammonium sulfate crystals pass through the screen cylinder and fall into the screen cylinder to achieve a screening effect.

[0019] Compared with the prior art, the present invention also has the following technical effects: In this invention, the steam heating structure combined with the chamber in the SA drying device enables steam to be evenly distributed within the chamber, ensuring that the temperature of each part of the inner barrel wall remains essentially consistent. This allows the ammonium sulfate crystals inside the barrel to be dried more evenly and thoroughly. Furthermore, the sieving and scattering structure continuously lifts and scatters these ammonium sulfate crystals, further ensuring even and thorough drying. Simultaneously, finer ammonium sulfate crystals pass through the mesh cylinder and fall inside, achieving a sieving effect. This integrates drying and sieving of ammonium sulfate crystals, improving production efficiency. Finally, by introducing hot air into the barrel, the ammonium sulfate crystals are dried evenly and thoroughly. The hot air flow also carries away the water vapor evaporated during drying, further enhancing the drying efficiency.

[0020] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the steps in the drying and purification process of the SA reaction system of the present invention; Figure 2 This is a schematic diagram of the SA drying device in the SA reaction system drying and purification process of the present invention; Figure 3 for Figure 2 A cross-sectional view of the AA surface; Figure 4 for Figure 2 Enlarged diagram of point B in the middle.

[0022] The reference numerals in the accompanying drawings include: 1. Fixing base; 2. Fixing frame; 3. Barrel body; 4. Feed pipe; 5. First discharge pipe; 6. Second discharge pipe; 7. Mesh cylinder; 8. Feeding plate; 9. Chamber; 10. Exhaust pipe; 11. Steam pipe; 12. Preheating air pipe; 13. Steam hole; 14. Air outlet pipe; 15. Air supply pipe; 16. Connecting pipe; 17. Drain pipe; 18. Ventilation pipe; 19. Ventilation branch pipe; 20. Ventilation hole; 21. Exhaust fan; 22. Leakage prevention mesh; 23. Motor bracket; 24. Motor; 25. First bevel gear; 26. Second bevel gear. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0025] 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.

[0026] In the above description of the present invention, it should be noted that the terms "one side," "the other side," 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 in which the product of the invention is conventionally placed during use. These terms are used only for the convenience of describing the present invention and for 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. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0028] See the example. Figure 1 As shown, this embodiment describes the drying and purification process of the SA reaction system, which includes the following steps: Step 1: Preheating: Start the SA drying device for preheating; Step 2, Feeding: Add the ammonium sulfate crystals to be dried to the SA drying unit; Step 3, Screening and Drying: The ammonium sulfate crystals to be dried are continuously lifted and scattered by the screening and lifting structure in the SA drying device for drying, while screening is carried out at the same time, finally obtaining coarse ammonium sulfate crystals and fine ammonium sulfate crystals. Step 4: Packaging and Storage: Fill coarse and fine ammonium sulfate crystals into separate packaging bags and seal them, or further sieve and then package and seal them as needed, and store them in a dry, ventilated and dark place.

[0029] The coarse ammonium sulfate crystals obtained by drying in the above steps were tested, and the results are shown in Table 1:

[0030] The fine ammonium sulfate crystals obtained by drying in the above steps were tested, and the results are shown in Table 2.

[0031] As shown in Tables 1 and 2, the moisture content of both coarse and fine ammonium sulfate crystals met the requirements for ammonium sulfate products in the "Fertilizer Grade Ammonium Sulfate" (GB / T 535-2020). This means that through the drying and purification process of the SA reaction system in this embodiment, coarse and fine ammonium sulfate crystals that meet the standards can be effectively dried and screened.

[0032] See Figure 2 , Figure 3 and Figure 4 As shown, the SA drying device includes a fixed base 1, several fixed frames 2 are welded on the fixed base 1, and an inclined barrel 3 is welded on the fixed frame 2. The upper end of the barrel 3 in the inclined direction is connected to a feed pipe 4, and the other end of the barrel 3 is connected to a first discharge pipe 5 for coarse ammonium sulfate crystal discharge and a second discharge pipe 6 for fine ammonium sulfate crystal discharge. A mesh cylinder 7 is coaxially arranged inside the barrel 3. Annular grooves are opened at both ends of the barrel 3 corresponding to the two ends of the mesh cylinder 7. Sliding blocks are slidably connected in the annular grooves. The two ends of the mesh cylinder 7 are welded to the sliding blocks in the corresponding annular grooves. Several L-shaped lifting plates 8 are welded on both the inner and outer sides of the mesh cylinder 7. The barrel body 3 includes an inner barrel wall and an outer barrel wall. There is a sealed chamber 9 between the inner barrel wall and the outer barrel wall. The chamber 9 is connected to an exhaust pipe 10 for steam discharge and a drain pipe 17 for condensate discharge. A steam pipe 11 and a preheating air pipe 12 are welded inside the chamber 9. Both the steam pipe 11 and the preheating air pipe 12 have a spiral structure. The steam pipe 11 has several steam holes 13. It also includes a steam generator and a blower. The outlet of the steam generator is connected to an exhaust pipe 14. The exhaust pipe 14 passes through the chamber 9 and is connected to the steam pipe 11. The air outlet of the blower is connected to an air supply pipe 15. The air supply pipe 15 passes through the chamber 9 and is connected to the preheating air pipe 12. The other end of the preheating air pipe 12 passes out of the chamber 9 and is connected to a connecting pipe 16. A ventilation pipe 18 is rotatably connected to and connected to the connecting pipe 16 via a rotary joint. The ventilation pipe 18 passes through the barrel body 3 and is located inside the mesh cylinder 7. The ventilation pipe 18 and the barrel body 3 are rotatably connected via a bearing. Several ventilation branch pipes 19 are connected to the ventilation pipe 18. The ventilation branch pipes 19 pass through the mesh cylinder 7 and are welded and fixed to the mesh cylinder 7. Several ventilation holes 20 are opened on the ventilation pipe 18 and the ventilation branch pipes 19. A ventilation opening is opened on the barrel body 3. An exhaust fan 21 is installed in the ventilation opening via bolts and nuts. A leak-proof net 22 is welded on the exhaust fan 21 to prevent the leakage of ammonium sulfate crystals. It also includes a motor bracket 23 welded to the fixed base 1. A motor 24 is installed on the motor bracket 23 via bolts and nuts. The output shaft of the motor 24 is keyed to a first bevel gear 25. The first bevel gear 25 meshes with a second bevel gear 26. The second bevel gear 26 is keyed to the ventilation pipe 18.

[0033] In this embodiment, the specific implementation method of the drying and purification process of the SA reaction system is as follows: Step 1, Preheating: Start the steam generator, so that the steam generated by the steam generator enters the steam pipe 11 through the steam outlet 14, and then is injected into the chamber 9 through the steam hole 13 on the steam pipe 11, thereby raising the temperature of the inner barrel wall to reach the effective drying temperature. At the same time, start the blower, so that the blower can send air from the air supply pipe 15 into the preheating air pipe 12. As the air flows through the preheating air pipe 12, it is heated by the steam in the chamber 9 and becomes hot air. Then it enters the ventilation pipe 18 through the connecting pipe 16, and enters the barrel 3 and the mesh cylinder 7 through the ventilation holes 20 on the ventilation pipe 18 and the ventilation branch pipe 19. At the same time, start the exhaust fan 21 to accelerate the outward flow of hot air in the barrel 3, so that the barrel 3 and the mesh cylinder 7 are filled with rapidly flowing hot air. After the steam generator, blower and exhaust fan 21 are started, they continue to run until the end of step three. Since the steam pipe 11 is welded to the chamber 9 in a spiral structure, the steam sprayed from the steam hole 13 on the steam pipe 11 can be distributed more evenly into the chamber 9, so that the temperature of each part of the inner barrel wall is basically the same, so that the ammonium sulfate crystals that need to be dried in the subsequent steps are heated and dried more evenly. During the above process, the excess steam in the chamber 9 is discharged from the exhaust pipe 10, and the condensate generated by the steam cooling in the chamber 9 is discharged from the drain pipe 17.

[0034] Step 2, Feeding: Add the ammonium sulfate crystals that need to be dried into the barrel 3 through the feed pipe 4.

[0035] Step 3, Screening and Drying: During the feeding process in Step 2, the motor 24 is started. The motor 24 drives the first bevel gear 25 to rotate, the first bevel gear 25 drives the second bevel gear 26 to rotate, and the second bevel gear 26 drives the ventilation pipe 18 to rotate. This causes the ventilation branch pipe 19 on the ventilation pipe 18 to drive the screen cylinder 7 to rotate, and the screen cylinder 7 drives the lifting plate 8 to rotate, lifting and scattering the ammonium sulfate crystals that need to be dried. This allows the ammonium sulfate crystals to be heated and dried more evenly and fully. During the scattering process, the finer ammonium sulfate crystals pass through the screen cylinder 7 and fall into the screen cylinder 7 to achieve the screening effect. During the drying and screening process of the ammonium sulfate crystals that need to be dried, since the barrel 3 is set at an inclination, these ammonium sulfate crystals move continuously along the inclination direction towards the first discharge pipe 5 and the second discharge pipe 6 in the barrel 3. Finally, the coarse ammonium sulfate crystals and fine ammonium sulfate crystals obtained after drying and screening are discharged through the first discharge pipe 5 and the second discharge pipe 6, respectively. Since finer ammonium sulfate crystals are easier to dry than coarser ones, after sieving, the coarser ammonium sulfate crystals are more likely to come into direct contact with the inner wall of the mesh cylinder 7 and be heated and dried, while the finer ammonium sulfate crystals are dried inside the mesh cylinder 7 by the high temperature and fast-flowing hot air inside the barrel 3. Therefore, sieving and drying can achieve good drying results for ammonium sulfate crystals of different sizes. By drying and sieving these ammonium sulfate crystals at the same time, the process is simplified and production efficiency is improved. Meanwhile, as the ventilation pipe 18 and ventilation branch pipe 19 rotate, the hot air ejected from the ventilation hole 20 can be more evenly distributed into the mesh cylinder 7 and barrel 3, further enabling the ammonium sulfate crystals to be heated and dried more evenly and fully. The rapidly flowing hot air can also carry away the water vapor evaporated during the drying of the ammonium sulfate crystals, thereby improving the drying efficiency of the ammonium sulfate crystals.

[0036] Step 4: Packaging and Storage: Fill coarse and fine ammonium sulfate crystals into separate packaging bags and seal them, or further sieve and then package and seal them as needed, and store them in a dry, ventilated and dark place.

[0037] The above are merely embodiments of the present invention. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this invention. These modifications and improvements should also be considered within the scope of protection of this invention, and will not affect the effectiveness of the implementation of this invention or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. The drying and purification process of the SA reaction system, characterized in that, Includes the following steps: Step 1: Preheating: Start the SA drying device for preheating; Step 2, Feeding: Add the ammonium sulfate crystals to be dried to the SA drying unit; Step 3, Screening and Drying: The ammonium sulfate crystals to be dried are continuously lifted and scattered by the screening and lifting structure in the SA drying device for drying, while screening is carried out at the same time, finally obtaining coarse ammonium sulfate crystals and fine ammonium sulfate crystals. Step 4: Packaging and Storage: Fill coarse and fine ammonium sulfate crystals into separate packaging bags and seal them, or further sieve and then package and seal them as needed, and store them in a dry, ventilated and dark place.

2. The drying and purification process for the SA reaction system according to claim 1, characterized in that: The SA drying device includes a fixed base, on which several fixed frames are fixedly connected. An inclined barrel is fixedly connected to each fixed frame. The barrel includes an inner barrel wall and an outer barrel wall, with a sealed chamber between the inner and outer barrel walls. A steam heating structure for heating is provided in the chamber. A screening and material-lifting structure for screening and lifting is provided in the barrel. A feed pipe is connected to the upper end of the inclined barrel. The other end of the barrel is connected to a first discharge pipe for coarse ammonium sulfate crystals and a second discharge pipe for fine ammonium sulfate crystals. In step one, the steam heating structure is activated to preheat the inner barrel wall. In step two, the ammonium sulfate crystals to be dried are added into the barrel through the feed pipe. In step three, the screening and sifting structure is activated to lift and scatter the ammonium sulfate crystals to be dried for drying, while screening is performed at the same time. Finally, coarse ammonium sulfate crystals are discharged from the first discharge pipe, and fine ammonium sulfate crystals are discharged from the second discharge pipe.

3. The drying and purification process for the SA reaction system according to claim 2, characterized in that: The steam heating structure includes a steam generator, the steam generator's outlet is connected to an outlet pipe, the outlet pipe passes through a chamber and is connected to a spiral-shaped steam pipe, the steam pipe is fixedly connected to the chamber, the steam pipe has several steam holes, and the chamber is connected to an exhaust pipe for steam discharge and a drain pipe for condensate discharge. In step one, the steam generator is started, and the steam generated by the steam generator enters the steam pipe through the outlet pipe, and then is injected into the chamber through the steam hole on the steam pipe, so that the inner barrel wall is heated evenly for preheating. In step three, the inner barrel wall is continuously heated to dry the ammonium sulfate crystals that need to be dried.

4. The drying and purification process for the SA reaction system according to claim 3, characterized in that: The screening and material lifting structure includes a screen cylinder disposed inside the barrel body, the two ends of the screen cylinder being slidably connected to the two ends of the barrel body, and several material lifting plates being fixedly connected to both the inner and outer sides of the screen cylinder, and also includes a driving component for driving the screen cylinder to rotate. In step three, the drive unit is activated to drive the mesh cylinder to rotate, and the mesh cylinder drives the lifting plate to rotate. During the rotation of the lifting plate, the lifting plate picks up the ammonium sulfate crystals that need to be dried and throws them for drying. At the same time, the finer ammonium sulfate crystals pass through the mesh cylinder and fall into the inside of the mesh cylinder.

5. The drying and purification process for the SA reaction system according to claim 4, characterized in that: It also includes a blower, the blower's air outlet being connected to an air supply pipe, the air supply pipe passing through the chamber and being connected to a preheating air pipe with a spiral structure, the preheating air pipe being fixedly connected to the chamber, the other end of the preheating air pipe passing out of the chamber and being connected to a connecting pipe, the connecting pipe being rotatably connected to and connected to a ventilation pipe, the ventilation pipe passing through the barrel and located inside the mesh cylinder, the ventilation pipe being rotatably connected to the barrel, the ventilation pipe being connected to several ventilation branch pipes, the ventilation branch pipes passing through the mesh cylinder and being fixedly connected to the mesh cylinder, the ventilation pipe and the ventilation branch pipes having several ventilation holes, and the driving component being used to drive the ventilation pipe to rotate; In step one, the blower is started, and air is forced from the air supply pipe into the preheating air pipe. As the air flows through the preheating air pipe, it is heated by the steam in the chamber and becomes hot air. Then, it enters the ventilation pipe through the connecting pipe and enters the barrel and mesh cylinder through the ventilation holes on the ventilation pipe and ventilation branch pipe for preheating. In step three, the blower continuously supplies hot air to the barrel and mesh cylinder. At the same time, the motor is started to drive the ventilation pipe to rotate, which causes the ventilation branch pipe on the ventilation pipe to drive the mesh cylinder to rotate. The mesh cylinder drives the lifting plate to rotate, lifting up and scattering the ammonium sulfate crystals that need to be dried for drying. Meanwhile, the finer ammonium sulfate crystals pass through the mesh cylinder and fall into the inside of the mesh cylinder.

6. The drying and purification process for the SA reaction system according to claim 5, characterized in that: The driving component includes a motor bracket fixedly connected to a fixed base, a motor mounted on the motor bracket, a first bevel gear fixedly connected to the output shaft of the motor, the first bevel gear meshing with a second bevel gear, and the second bevel gear fixedly connected to a ventilation pipe; In step three, the motor is started to drive the first bevel gear to rotate, the first bevel gear drives the second bevel gear to rotate, the second bevel gear drives the ventilation pipe to rotate, the ventilation branch pipe on the ventilation pipe drives the mesh cylinder to rotate, the mesh cylinder drives the lifting plate to rotate, lifting up and scattering the ammonium sulfate crystals that need to be dried for drying, while the finer ammonium sulfate crystals pass through the mesh cylinder and fall into the inside of the mesh cylinder.

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