Special granulator for production process of high-tower urea-based compound fertilizer

Abstract

The utility model relates to a special pelletizer for a production process of a high-tower urea-based compound fertilizer, which relates to the field of pelletizers and comprises a tower body, a shearing and emulsifying unit and a pelletizing unit, the shearing and emulsifying unit and the pelletizing unit are mounted at the top end of the tower body, and two opposite auger conveyors are arranged at the top of the shearing and emulsifying unit. Two auger conveyors are arranged in the shearing and emulsifying unit, feeding pipes are arranged at the bottoms of the two auger conveyors, the two feeding pipes are respectively communicated with an inner cavity of the shearing and emulsifying unit, and the granulating unit is positioned below the shearing and emulsifying unit and is communicated or sealed with the inner cavity of the shearing and emulsifying unit through an opening and closing unit. The packing auger conveying can enable materials to flow more smoothly, the phenomenon of feeding blockage is avoided, the two packing auger conveyors can convey different raw materials respectively, and the conveying efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of granulators, and in particular to a special granulator for the production process of high-tower urea-based compound fertilizer. Background Technology

[0002] Common granulation processes for compound fertilizers include: rotary drum granulation, disc granulation, spray granulation, and granulation tower granulation. Granulation tower granulation involves using a bucket elevator to lift highly corrosive raw materials such as nitrogen, phosphorus, and potassium to the top of the tower for melting and granulation. Solid urea or ammonium nitrate (such as ammonium nitrate phosphate) is heated and melted into a molten liquid. Appropriate phosphate fertilizers, potassium fertilizers, fillers, and additives are added to the molten liquid to create a mixed slurry. This slurry is then fed into the granulation tower granulator for spray granulation. The granulated material, sprayed into the granulation tower, interacts with the rising gas resistance as it descends, exchanging heat before falling to the bottom. The granules at the bottom are then screened and surface-treated to obtain granular compound fertilizer.

[0003] The main equipment for tower-type compound fertilizer production consists of three parts: First, the tower body: the granulation tower is the main equipment for producing granular compound fertilizer. The main function of the granulation tower is to allow the compound fertilizer to crystallize and exchange heat within the tower. The diameter and height of the granulation tower are the main indicators of the equipment, which are closely related to the production capacity and quality of the product. Second, the granulation unit: the granulator can meet the requirements of various slurries for compound fertilizer granulation as needed, especially for the granulation of medium and low nitrogen compound fertilizers, where it has excellent performance. Third, the shearing emulsification unit: its main function is to fully stir and mix the materials within the equipment to prepare a slurry with good flowability. Currently, because the materials are usually prepared as liquid raw materials and transported to the top of the tower, and the liquid raw materials have a certain viscosity, material blockage can easily occur when entering the shearing emulsification unit.

[0004] Therefore, it is necessary to provide a new granulator specifically designed for the production process of high-tower urea-based compound fertilizers to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a special granulator for the production process of high-tower urea-based compound fertilizer.

[0006] This utility model provides a special granulator for the production process of high-tower urea-based compound fertilizer, including a tower body, a shearing emulsification unit installed at the top of the tower body, and a granulation unit. The top of the shearing emulsification unit is provided with two opposing auger conveyors, and the bottom of each of the two auger conveyors is provided with a feed pipe. The two feed pipes are respectively connected to the inner cavity of the shearing emulsification unit. The granulation unit is located below the shearing emulsification unit and is connected to or closed with its inner cavity through an opening and closing unit.

[0007] Furthermore, the shear emulsification unit includes a first fixed plate, a support base, an emulsification tank, and a stirring mechanism. The first fixed plate is fixedly installed on the inner side wall of the tower body, the support base is fixedly connected to the top of the first fixed plate, the emulsification tank is fixedly installed on the support base, and the bottom of the emulsification tank has an opening. The stirring mechanism is located inside the emulsification tank.

[0008] Furthermore, the opening and closing unit is located at the opening at the bottom of the emulsifying tank, and a connecting pipe is provided directly below the opening and closing unit. One end of the connecting pipe passes through the first fixing plate and is connected to the inner cavity of the granulation unit.

[0009] Furthermore, the stirring mechanism includes a motor, a stirring shaft, and multiple stirring blades. The motor is fixedly installed on the top of the emulsifying tank, the output end of the motor is fixedly connected to the top end of the stirring shaft, the bottom end of the stirring shaft extends into the interior of the emulsifying tank, and the surface of the stirring shaft is rotatably connected to the emulsifying tank. The multiple stirring blades are circumferentially arranged around the outer surface of the stirring shaft.

[0010] Furthermore, the opening and closing unit includes a sealing plate and a telescopic electric cylinder. The telescopic electric cylinder is fixedly installed at the bottom of the emulsifying tank. The output end of the telescopic electric cylinder is fixedly connected to one end of the sealing plate, and the sealing plate is slidably installed at the bottom of the emulsifying tank. The size of the sealing plate is larger than the size of the bottom opening of the emulsifying tank.

[0011] Furthermore, the granulation unit includes a second fixed plate, a storage tank, a granulation nozzle, and an air supply pump. The second fixed plate is fixedly installed on the inner side wall of the tower body. The storage tank is installed between the first fixed plate and the second fixed plate. The granulation nozzle is connected to the inner cavity of the storage tank, and the bottom of the granulation nozzle passes through the bottom of the second fixed plate. The air supply pump is installed on the outer surface of the storage tank, and the output end of the air supply pump is connected to the inner cavity of the storage tank.

[0012] The use of a specialized granulator for the production process of high-tower urea-based compound fertilizers has brought the following positive effects to the production process:

[0013] This specialized granulator features an optimized granulation process, resulting in more uniform and efficient granulation and improved fertilizer granule quality. The auger conveyor design ensures smoother material flow, reducing blockages within the shearing emulsification unit and guaranteeing a continuous and stable production process. Two opposing auger conveyors can transport different raw materials separately, improving material conveying efficiency and accelerating the entire production process. The mixing mechanism within the shearing emulsification unit ensures thorough mixing of materials, improving the uniformity of the slurry and resulting in a more even distribution of nutrients in the fertilizer. The specialized granulator design reduces the risk of high-temperature material ejection during production, protecting operator safety. By increasing granulation efficiency and reducing material waste, production costs are lowered, improving economic benefits. The coating process gives the fertilizer granules a slow-release effect, improving fertilizer utilization and reducing nutrient loss. The fertilizer granules produced by this specialized granulator have better physical stability, reducing breakage and degradation during storage and transportation.

[0014] This specialized granulator can adjust parameters according to different production needs, exhibiting good flexibility and adaptability, and is suitable for producing high-tower urea-based compound fertilizers.

[0015] The special granulator for the production process of high-tower urea-based compound fertilizer provided by this utility model has the following beneficial effects: This utility model uses two auger conveyors to transport materials into the shearing emulsification unit. The auger conveyor can make the material flow more smoothly and avoid the phenomenon of material blockage. Moreover, the two auger conveyors can transport different raw materials separately, which can speed up the conveying efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a granulator specifically designed for the production process of this high-tower urea-based compound fertilizer, as shown in Example 1.

[0017] Figure 2 This is a schematic diagram of the combined structure of the shearing emulsification unit and the granulation unit in an embodiment of the special granulator for the production process of this high-tower urea-based compound fertilizer.

[0018] Figure 3 This is a schematic diagram of the shearing emulsification unit in an embodiment of the granulator used in the production process of this high-tower urea-based compound fertilizer. Figure 1 ;

[0019] Figure 4 This is a schematic diagram of the shearing emulsification unit in an embodiment of the granulator used in the production process of this high-tower urea-based compound fertilizer. Figure 2 ;

[0020] Figure 5 This is a cross-sectional structural diagram of the granulator used in the production process of this high-tower urea-based compound fertilizer.

[0021] Figure 6 for Figure 5 The enlarged structural diagram at point A is shown below;

[0022] Figure 7 for Figure 5 The enlarged structural diagram at point B is shown.

[0023] Labels in the diagram: 1. Tower body; 2. Screw conveyor; 3. Feed pipe; 4. First fixed plate; 5. Support base; 6. Emulsifying tank; 7. Connecting pipe; 8. Motor; 9. Stirring shaft; 10. Stirring blades; 11. Sealing plate; 12. Telescopic electric cylinder; 13. Second fixed plate; 14. Storage tank; 15. Granulation nozzle; 16. Air supply pump; 17. Connecting pipe. Detailed Implementation

[0024] Example 1

[0025] High-tower urea-based compound fertilizer includes: 75% nitrogen source, 10% phosphorus source, 10% potassium source, 1% calcium powder, 1% functional additives, and filler to make up the remainder to 100%.

[0026] Nitrogen fertilizer is composed of urea and ammonium chloride; phosphate fertilizer is diammonium phosphate; potassium fertilizer is potassium sulfate; functional additives are composed of anti-caking agents, humic acid, zinc, and boron; and filler is talc.

[0027] The production process of high-tower urea-based compound fertilizer includes the following steps:

[0028] Step 1: The nitrogen source is supplied to the melting tank in proportion and heated to melt;

[0029] Step 2: Using different metering belt scales, phosphorus source, potassium source, calcium powder, filler, etc. are first transported to the molten liquid in step 1 to form a mixed slurry. The mixed slurry is granulated by a granulator, cooled and then falls into the collection hopper to obtain coarse particles.

[0030] Step 3: The coarse particles from Step 2 are fed into a coating kiln, and functional additives are added for coating. After packaging, the high-tower urea-based compound fertilizer is obtained.

[0031] This embodiment describes a granulator specifically designed for the production process of the aforementioned high-tower urea-based compound fertilizer, specifically for step two of the production process.

[0032] Please refer to the following: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 as well as Figure 6 ,in, Figure 1 A schematic diagram of the structure of a special granulator for the production process of high-tower urea-based compound fertilizer provided by this utility model; Figure 2 A schematic diagram of the combined structure of the shear emulsification unit and the granulation unit provided by this utility model; Figure 3 Schematic diagram of the shear emulsification unit provided by this utility model Figure 1 ; Figure 4 Schematic diagram of the shear emulsification unit provided by this utility model Figure 2 ; Figure 5 A cross-sectional structural schematic diagram of the special granulator for the production process of high-tower urea-based compound fertilizer provided by this utility model; Figure 6 for Figure 5 The enlarged structural diagram at point A is shown below; Figure 7 for Figure 5 The enlarged structural diagram at point B is shown.

[0033] In the specific implementation process, such as Figures 1-7 As shown, the special granulator for the production process of high-tower urea-based compound fertilizer includes a tower body 1, a shearing emulsification unit installed at the top of the tower body 1, and a granulation unit. The top of the shearing emulsification unit is equipped with two opposing auger conveyors 2, and the bottom of each of the two auger conveyors 2 is equipped with a feed pipe 3. The two feed pipes 3 are respectively connected to the inner cavity of the shearing emulsification unit. The granulation unit is located below the shearing emulsification unit and is connected to or closed to its inner cavity through an opening and closing unit. The material is transported into the shearing emulsification unit by the two auger conveyors 2. The auger conveyor can make the material flow more smoothly and avoid the phenomenon of feeding blockage. Moreover, the two auger conveyors 2 can transport different raw materials separately, thereby speeding up the conveying efficiency.

[0034] It should be noted that the shear emulsification unit includes a first fixed plate 4, a support base 5, an emulsification tank 6, and a stirring mechanism. The first fixed plate 4 is fixedly installed on the inner side wall of the tower body 1, the support base 5 is fixedly connected to the top of the first fixed plate 4, the emulsification tank 6 is fixedly installed on the support base 5, and the bottom of the emulsification tank 6 has an opening. The stirring mechanism is located inside the emulsification tank 6.

[0035] The opening and closing unit is located at the opening at the bottom of the emulsifying tank 6. A connecting pipe 7 is provided directly below the opening and closing unit. One end of the connecting pipe 7 passes through the first fixing plate 4 and is connected to the inner cavity of the granulation unit.

[0036] The mixing mechanism includes a motor 8, a mixing shaft 9, and multiple mixing blades 10. The motor 8 is fixedly installed on the top of the emulsification tank 6. The output end of the motor 8 is fixedly connected to the top end of the mixing shaft 9. The bottom end of the mixing shaft 9 extends into the interior of the emulsification tank 6, and the surface of the mixing shaft 9 is rotatably connected to the emulsification tank 6. Multiple mixing blades 10 are arranged circumferentially around the outer surface of the mixing shaft 9. By starting the motor 8, the mixing shaft 9 is driven to rotate, and the mixing shaft 9 drives the multiple mixing blades 10 to rotate to mix and emulsify the compound fertilizer raw materials.

[0037] The granulation unit includes a second fixed plate 13, a storage tank 14, a granulation nozzle 15, and an air supply pump 16. The second fixed plate 13 is fixedly installed on the inner wall of the tower body 1. The storage tank 14 is installed between the first fixed plate 4 and the second fixed plate 13. The granulation nozzle 15 is connected to the inner cavity of the storage tank 14, and the bottom of the granulation nozzle 15 passes through the bottom of the second fixed plate 13. The air supply pump 16 is installed on the outer surface of the storage tank 14, and the output end of the air supply pump 16 is connected to the inner cavity of the storage tank 14. Air can be supplied to the inside of the storage tank 14 through the air supply pump 16, so that the pressure inside the storage tank 14 increases and the emulsified material is sprayed out through the granulation nozzle 15. After falling inside the tower by gravity, since the height of the tower body 1 is generally high, it cools and solidifies during the falling process to form compound fertilizer. During the operation of the air supply pump 16, the inner cavities of the granulation unit and the shear emulsification unit are closed through the opening and closing unit.

[0038] It should be noted that there are many types of granulation nozzles on the market, meaning that the appropriate type can be selected based on specific application needs.

[0039] The opening and closing unit includes a sealing plate 11 and a telescopic electric cylinder 12. The telescopic electric cylinder 12 is fixedly installed at the bottom of the emulsifying tank 6. The output end of the telescopic electric cylinder 12 is fixedly connected to one end of the sealing plate 11, and the sealing plate 11 is slidably installed at the bottom of the emulsifying tank 6. The size of the sealing plate 11 is larger than the size of the bottom opening of the emulsifying tank 6. The telescopic electric cylinder 12 can drive the sealing plate 11 to slide at the bottom of the emulsifying tank 6, thereby opening and closing the bottom opening of the emulsifying tank 6. When the bottom opening of the emulsifying tank 6 is open, its inner cavity is connected to the inner cavity of the storage tank 14.

[0040] Example 2

[0041] In the specific implementation process, unlike Example 1, the reference is... Figure 6 As shown, the tops of the two auger conveyors 2 are enclosed, and the tops of the two auger conveyors 2 are equipped with connecting pipes 17. These connecting pipes 17 are used to connect to the raw material conveying pipes that convey raw materials to the top of the tower body 1, which can make the material flow smoothly while preventing high-temperature materials from spraying out and scalding employees.

[0042] The working principle of this utility model is as follows: The material is transported to the shearing emulsification unit by two auger conveyors 2. The auger conveyor can make the material flow more smoothly and avoid the phenomenon of material blockage. The two auger conveyors 2 can transport different raw materials respectively, which can speed up the conveying efficiency. The air supply pump 16 can supply air into the storage tank 14, which increases the pressure inside the storage tank 14 and sprays the emulsified material out through the granulation nozzle 15. After falling into the tower by gravity, since the height of the tower body 1 is generally high, it cools and solidifies during the falling process to form compound fertilizer.

[0043] Comparative Example 1

[0044] The raw materials used are the same as those in Example 1. However, the granulator used in Example 1 is not used in the granulation process. Instead, a conventional granulator is used to obtain the comparative fertilizer D1, N-P2O5-K2O:30-5-5.

[0045] I. Evaluation Test (Sieve Test):

[0046] 1) Experimental objective: To understand the particle size of fertilizer granules;

[0047] 2) Experimental fertilizers: The high-tower urea-based compound fertilizer N5 from Example 1 and the control fertilizer D1 were selected;

[0048] 3) Experimental method: Select the continuous production granulation process for 1 hour, and then sieve the fertilizer through a sieve of 1.00mm to 4.75mm according to GB / T15063-2020 "Compound Fertilizer" at the discharge port. Each process was repeated 5 times. The return rate = return amount / input amount. The return rate results of different processes are shown in Table 1.

[0049] Table 1. Return rate for different processes

[0050]

[0051]

[0052] Evaluation test (testing test):

[0053] 1) Experimental objective: To understand the uniformity of fertilizer nutrient distribution;

[0054] 2) Experimental fertilizers: The high-tower urea-based compound fertilizer N5 (N-P2O5-K2O:30-5-5) from Example 1 and the control fertilizer D1 (N-P2O5-K2O:30-5-5) were selected.

[0055] 3) Test method: 100g of sample was randomly selected and crushed. Then, the nitrogen, phosphorus and potassium contents of the fertilizer to be tested were detected according to GB / T15063-2020 "Compound Fertilizer". Five tests were randomly selected for each fertilizer variety. The nutrient results are shown in Table 2.

[0056] Table 2 Nutrient content in fertilizers

[0057]

[0058] As shown in Table 1, the return rate of the high-tower urea-based compound fertilizer produced in Example 1 is significantly lower than that in Comparative Example 1. The high-tower urea-based compound fertilizer and granulator provided by this invention can improve the quality of granules and the granulation efficiency.

[0059] As shown in Table 2, the fertilizer produced according to the solution provided by this utility model has a lower nutrient content and a larger nutrient fluctuation rate compared to the fertilizer. The technical solution of this utility model can make the mixture of materials with higher viscosity more uniform and reduce nutrient fluctuation.

[0060] The above descriptions are merely two embodiments of this utility model. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the principle of this utility model, and these should also be considered to fall within the protection scope of this utility model.

Claims

1. A granulator specifically designed for the production process of high-tower urea-based compound fertilizer, characterized in that: It includes a tower body (1), a shear emulsification unit installed at the top of the tower body (1), and a granulation unit; The top of the shear emulsification unit is provided with two opposing auger conveyors (2), and the bottom of the two auger conveyors (2) is provided with feed pipes (3). The two feed pipes (3) are respectively connected to the inner cavity of the shear emulsification unit. The granulation unit is located below the shear emulsification unit and is connected to or closed with its inner cavity through an opening and closing unit.

2. The granulator for the production process of high-tower urea-based compound fertilizer according to claim 1, characterized in that: The shear emulsification unit includes a first fixing plate (4), a support base (5), an emulsification tank (6), and a stirring mechanism. The first fixing plate (4) is fixedly installed on the inner side wall of the tower body (1). The support base (5) is fixedly connected to the top of the first fixing plate (4). The emulsification tank (6) is fixedly installed on the support base (5), and the bottom of the emulsification tank (6) has an opening. The stirring mechanism is located inside the emulsification tank (6).

3. The granulator for the production process of high-tower urea-based compound fertilizer according to claim 2, characterized in that: The opening and closing unit is located at the opening at the bottom of the emulsifying tank (6). A connecting pipe (7) is provided directly below the opening and closing unit. One end of the connecting pipe (7) passes through the first fixing plate (4) and is connected to the inner cavity of the granulation unit.

4. The granulator for the production process of high-tower urea-based compound fertilizer according to claim 3, characterized in that: The stirring mechanism includes a motor (8), a stirring shaft (9), and multiple stirring blades (10). The motor (8) is fixedly installed on the top of the emulsifying tank (6). The output end of the motor (8) is fixedly connected to the top end of the stirring shaft (9). The bottom end of the stirring shaft (9) extends into the interior of the emulsifying tank (6), and the surface of the stirring shaft (9) is rotatably connected to the emulsifying tank (6). The multiple stirring blades (10) are arranged circumferentially around the outer surface of the stirring shaft (9).

5. The granulator for the production process of high-tower urea-based compound fertilizer according to claim 4, characterized in that: The opening and closing unit includes a sealing plate (11) and a telescopic electric cylinder (12). The telescopic electric cylinder (12) is fixedly installed at the bottom of the emulsifying tank (6). The output end of the telescopic electric cylinder (12) is fixedly connected to one end of the sealing plate (11). The sealing plate (11) is slidably installed at the bottom of the emulsifying tank (6). The size of the sealing plate (11) is larger than the size of the bottom opening of the emulsifying tank (6).

6. The granulator for the production process of high-tower urea-based compound fertilizer according to claim 3, characterized in that: The granulation unit includes a second fixed plate (13), a storage tank (14), a granulation nozzle (15), and an air supply pump (16). The second fixed plate (13) is fixedly installed on the inner wall of the tower body (1). The storage tank (14) is installed between the first fixed plate (4) and the second fixed plate (13). The granulation nozzle (15) is connected to the inner cavity of the storage tank (14), and the bottom of the granulation nozzle (15) passes through the bottom of the second fixed plate (13). The air supply pump (16) is installed on the outer surface of the storage tank (14), and the output end of the air supply pump (16) is connected to the inner cavity of the storage tank (14).

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