Fluidized bed granulation device for urea granule production
The fluidized bed granulation device, which uses multi-stage screening and rotary drum secondary granulation, solves the particle problem caused by the increase in return material ratio, achieves efficient screening and particle size improvement, and meets the strict requirements of downstream products.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANXI LUAN COAL BASED SYNTHETIC OIL
- Filing Date
- 2025-05-16
- Publication Date
- 2026-05-05
AI Technical Summary
When processing urea particles ranging from 2.0 mm to 2.85 mm, the existing fluidized bed granulation system increases the return ratio, resulting in excessive fine powder. This leads to problems such as excessive particle agglomeration, widened particle size distribution, increased proportion of coarse particles, and rough surface clumping, making it difficult to meet the stringent requirements of downstream products for the roundness and smoothness of urea particles.
The system employs a multi-stage screening device, including a fluidized bed body, a rotary drum granulator, and multiple screening screens. Multi-stage screening and secondary granulation in the rotary drum are achieved through a vibrating frame drive assembly, ensuring that the particle size meets the requirements, avoiding excessively high return material ratios, and improving the product particle size qualification rate.
It improved the product particle size qualification rate, stabilized the process flow, reduced production fluctuations and costs, and improved the roundness and smoothness of the particles, meeting the high standard requirements of downstream products.
Smart Images
Figure CN224194640U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of urea granulation technology, and in particular to a fluidized bed granulation device for urea granulation production. Background Technology
[0002] In the field of urea production, there are currently three main granulation technologies: fluidized bed granulation, high tower granulation, and rotary drum granulation. In actual production, large-particle urea complies with the GB / T2440-2017 product standard, with particle size ranging from 2.0mm to 4.75mm. A pass rate of over 90% is considered a qualified product, and over 93% is considered a superior product. With the development of downstream urea products, the requirements for the roundness, smoothness, and particle size of urea particles are becoming increasingly stringent. The industry's standards for urea particle size are even higher than the national standards.
[0003] The existing fluidized bed granulation system returns particles smaller than 2.0 mm as seed crystals to the fluidized bed granulator for granulation, while urea particles larger than 4.75 mm are crushed and returned as seed crystals. Particles between 2.0 mm and 4.75 mm are sold as finished products. However, if urea particles between 2.0 mm and 2.85 mm are returned as seed crystals, the return ratio will increase, resulting in excessive fine powder in the returned material. This leads to problems such as excessive particle agglomeration, widened particle size distribution, increased proportion of coarse particles, rough particle surface, and even clumping.
[0004] Therefore, it is necessary to provide a new fluidized bed granulation device for urea granulation production to solve the above-mentioned technical problems. Utility Model Content
[0005] To solve the above-mentioned technical problems, this utility model provides a fluidized bed granulation device for urea granule production.
[0006] The fluidized bed granulation device for urea granulation provided by this utility model includes: a fluidized bed body, a first feed plate fixedly connected to one side of the fluidized bed body, a base provided on one side of the fluidized bed body, a first vibrating frame installed on the top of the base, a first screening screen fixedly connected inside the first vibrating frame, a second screening screen installed inside the vibrating frame, a rotary drum granulator for granulation provided on one side of the base, a support provided on one side of the rotary drum granulator, a second vibrating frame slidably connected to the top of the support, a third screening screen fixedly connected inside the second vibrating frame, a first driving component for driving the first vibrating frame, the first screening screen and the second screening screen installed on the top of the base, and a second driving component for driving the second vibrating frame installed on the top of the support.
[0007] Preferably, the first drive assembly includes: a first drive motor, a drive pulley, a rotating shaft, a driven pulley, and eccentric blocks. The first drive motor is mounted on the top of the base. The output end of the first drive motor is fixedly connected to the drive pulley. The rotating shaft is rotatably connected inside the first vibration frame. The driven pulley is fixedly connected to one end of the rotating shaft near the drive pulley. The drive pulley and the driven pulley are driven by a belt. Eccentric blocks are symmetrically fixedly connected to both sides of the rotating shaft.
[0008] Preferably, the second drive assembly includes: a second drive motor, a turntable, a rotating rod, and a connecting rod. The second drive motor is fixedly connected to the top of the bracket, the turntable is fixedly connected to the output end of the second drive motor, the rotating rod is fixedly connected to one side of the turntable, the connecting rod is rotatably connected to the outer wall of the rotating rod, and the end of the connecting rod away from the rotating rod is rotatably connected to the second vibration frame.
[0009] Preferably, a buffer seat is fixedly connected to the top of the base, a rotating plate is rotatably connected to the top of the buffer seat, the top of the rotating plate is fixedly connected to the first drive motor, a slide rod is slidably connected to the top of the buffer seat, the slide rod passes through the top of the buffer seat and slides inside the rotating plate, a tension spring is sleeved on the outer wall of the slide rod, one end of the tension spring is fixedly connected to the buffer seat, and the other end of the tension spring is fixedly connected to the slide rod.
[0010] Preferably, a vibration spring is fixedly connected to the top of the base, and the top of the vibration spring is fixedly connected to the first vibration frame.
[0011] Preferably, the mesh diameters of the first, second, and third screening screens decrease in that order.
[0012] Preferably, a feeding chute is fixedly connected to the side of the first vibrating frame near the rotary drum granulator, and a storage box is provided on the side of the first vibrating frame near the rotary drum granulator.
[0013] Compared with related technologies, the fluidized bed granulation device for urea granule production provided by this utility model has the following beneficial effects:
[0014] Improve product particle size qualification rate:
[0015] By performing secondary granulation on urea particles of 2.0mm to 3.0mm in the fluidized bed urea product, the pass rate of the product particle size grade reaching 3.0mm to 4.75mm is improved, which meets the strict requirements of downstream products for urea particle size and improves product quality.
[0016] Stable process flow:
[0017] This device avoids fluctuations in the original fluidized bed granulation process caused by excessively high return material ratios, ensuring the stability of the production process and reducing production problems and cost increases caused by process fluctuations.
[0018] High-efficiency screening and grading:
[0019] The device is equipped with multiple screening screens with decreasing mesh diameters, which can effectively screen and classify urea particles, ensuring that the particles entering the rotary drum granulator and the particle size of the final product meet the requirements, thus improving the accuracy and reliability of the entire granulation process. Attached Figure Description
[0020] Figure 1 A schematic diagram of the fluidized bed granulation device for urea granulation provided by this utility model;
[0021] Figure 2 for Figure 1 One of the structural schematic diagrams of the first vibration frame shown;
[0022] Figure 3 for Figure 2 The second schematic diagram of the first vibration frame is shown.
[0023] Figure 4 for Figure 3 The diagram shows the structure of the first driving component.
[0024] Figure 5 for Figure 1 The schematic diagram of the second vibration frame shown.
[0025] Figure 6 for Figure 5 The diagram shows the structure of the second drive component.
[0026] The following are the labeling elements in the diagram: 1. Fluidized bed body; 2. First feed plate; 3. First vibrating frame; 4. First screening screen; 5. Second screening screen; 6. Rotary drum granulator; 7. Support; 8. Second vibrating frame; 9. Third screening screen; 10. Base; 21. First drive motor; 22. Drive pulley; 23. Rotating shaft; 24. Driven pulley; 25. Eccentric block; 31. Second drive motor; 32. Turntable; 33. Rotating rod; 34. Connecting rod; 41. Buffer seat; 42. Rotating plate; 43. Slide rod; 44. Tension spring; 51. Vibration spring; 71. Feed trough; 72. Storage box. Detailed Implementation
[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.
[0028] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.
[0029] Please see Figures 1 to 6A fluidized bed granulation apparatus for urea granulation production includes: a fluidized bed body 1, a first feed plate 2 fixedly connected to one side of the fluidized bed body 1, a base 10 provided on one side of the fluidized bed body 1, a first vibrating frame 3 mounted on the top of the base 10, a first screening screen 4 fixedly connected inside the first vibrating frame 3, a second screening screen 5 installed inside the vibrating frame, a rotary drum granulator 6 for granulation provided on one side of the base 10, a support 7 provided on one side of the rotary drum granulator 6, a second vibrating frame 8 slidably connected to the top of the support 7, and a second vibrating frame 8 fixedly connected inside the second vibrating frame 8. A third screening screen 9 is connected. A first driving component for driving the first vibrating frame 3, the first screening screen 4, and the second screening screen 5 is installed on the top of the base 10. A second driving component for driving the second vibrating frame 8 is installed on the top of the bracket 7. A vibration spring 51 is fixedly connected to the top of the base 10. The top of the vibration spring 51 is fixedly connected to the first vibrating frame 3. The mesh diameters of the first screening screen 4, the second screening screen 5, and the third screening screen 9 decrease in that order. A feeding chute 71 is fixedly connected to the side of the first vibrating frame 3 near the rotary drum granulator 6. A storage box 72 is provided on the side of the first vibrating frame 3 near the rotary drum granulator 6.
[0030] It should be noted that when the first vibrating frame 3 vibrates, it will transmit force to the vibrating spring 51. The elastic force of the vibrating spring 51 will improve the vibration effect of the first vibrating frame 3 and improve the screening efficiency of the first screening screen 4 and the second screening screen 5. There are two storage boxes 72, one for collecting particles with a diameter greater than 4.75mm and the other for collecting particles with a diameter between 3mm and 4.75mm for packaging and sale.
[0031] Please see Figure 1 and Figure 4 The first drive assembly includes: a first drive motor 21, a drive pulley 22, a rotating shaft 23, a driven pulley 24, and an eccentric block 25. The first drive motor 21 is mounted on the top of the base 10. The output end of the first drive motor 21 is fixedly connected to the drive pulley 22. The rotating shaft 23 is rotatably connected inside the first vibration frame 3. The driven pulley 24 is fixedly connected to one end of the rotating shaft 23 near the drive pulley 22. The drive pulley 22 and the driven pulley 24 are driven by a belt. Eccentric blocks 25 are symmetrically fixedly connected to both sides of the rotating shaft 23. A buffer seat 41 is fixedly connected to the top of the base 10. A rotating plate 42 is rotatably connected to the top of the buffer seat 41. The top of the rotating plate 42 is fixedly connected to the first drive motor 21. A sliding rod 43 is slidably connected to the top of the buffer seat 41. The sliding rod 43 passes through the top of the buffer seat 41 and slides inside the rotating plate 42. A tension spring 44 is sleeved on the outer wall of the sliding rod 43. One end of the tension spring 44 is fixedly connected to the buffer seat 41, and the other end of the tension spring 44 is fixedly connected to the sliding rod 43.
[0032] It should be noted that: the top of the slide bar 43 is fixedly connected to a limit ball, the limit ball is located above the rotating plate 42 and presses the rotating plate 42, and the tension spring 44 is initially in a contracted state;
[0033] Please see Figure 1 , Figure 5 and Figure 6 The second drive assembly includes: a second drive motor 31, a turntable 32, a rotating rod 33, and a connecting rod 34. The second drive motor 31 is fixedly connected to the top of the bracket 7. The turntable 32 is fixedly connected to the output end of the second drive motor 31. The rotating rod 33 is fixedly connected to one side of the turntable 32. The connecting rod 34 is rotatably connected to the outer wall of the rotating rod 33. The end of the connecting rod 34 away from the rotating rod 33 is rotatably connected to the second vibration frame 8.
[0034] It should be noted that the rotating rod 33 is not located at the axis of the turntable 32. When the rotating rod 33 rotates, it will drive the second vibrating frame 8 to slide back and forth on the support 7 through the connecting rod 34. The back and forth movement of the third screening screen 9 in the second vibrating frame 8 screens the particles after the drum granulation. Particles with a diameter of 3.0mm to 4.75mm are sold as products, while particles smaller than 3.0mm are collected by the staff and returned to the drum granulator 6 for granulation.
[0035] The working principle of the fluidized bed granulation device for urea granulation production provided by this utility model is as follows:
[0036] Fluidized bed granulation stage:
[0037] In the fluidized bed body 1, fine particles are first added to the porous plate as seed crystals. Heated air is introduced from below the porous plate to form a fluidized bed. Nozzles buried in the fluidized bed layer spray molten urea with a concentration of 95% to 97%. The molten urea is atomized into extremely fine droplets by the hot air and adheres to the surface of the seed crystal particles. After a certain period of time, the urea seed crystals grow to the specified size. After being cooled inside the granulator, they are cooled from 110-120°C to 90°C by air. Then, they are discharged from the first feeding plate 2 into the first screening screen 4 on the first vibrating frame 3.
[0038] Initial screening:
[0039] The first drive motor 21 drives the active pulley 22 to rotate, which in turn drives the driven pulley 24 to rotate via belt transmission. The driven pulley 24 drives the rotating shaft 23 to rotate, and the eccentric blocks 25 on both sides of the rotating shaft 23 rotate accordingly, generating periodic centrifugal force, causing the rotating shaft 23 to vibrate. The rotating shaft 23 drives the first vibrating frame 3, the first screening screen 4, and the second screening screen 5 to vibrate. The vibration of the rotating shaft 23 drives the driven pulley 24 to vibrate. When the driven pulley 24 moves downward, the belt on the driven pulley 24 loses its support. Since the tension spring 44 is always in a contracted state, the tension spring 44 compresses the slide rod 43, causing the slide rod 43 to move towards the bottom of the buffer seat 41. The limiting ball at the top of the slide rod 43 compresses the rotating plate 42, and the rotating plate 42 rotates with the buffer seat 41. The shaft rotates around the center of rotation, and the rotating plate 42 drives the first drive motor 21 to rotate, thereby driving the active pulley 22 to descend. Since both the active pulley 22 and the driven pulley 24 descend, the belt remains taut to ensure the transmission effect. During the vibration of the first vibrating frame 3, the urea particles are screened through the first screening screen 4 and the second screening screen 5. The first screening screen 4 screens out particles larger than 4.75mm, which fall into the storage box 72 from the feed chute 71. After being crushed in the crusher, they re-enter the fluidized bed body 1 for granulation. Particles with a diameter of 3.0mm to 4.75mm enter another storage box 72 to await subsequent packaging and sales, while particles with a diameter of 2.0mm to 3.0mm enter the rotary drum granulator 6 for secondary granulation.
[0040] Rotary drum granulation stage:
[0041] In the rotary drum granulator 6, molten urea is sprayed onto the surface of urea granules of 2.0 mm to 3.0 mm. The rotation of the drum causes the granules to roll and adhere, forming large granules.
[0042] Secondary screening:
[0043] After being granulated by the rotary drum granulator 6, the granules enter the second vibrating frame 8. The second drive motor 31 drives the turntable 32 to rotate, and the rotating rod 33 on the turntable 32 rotates accordingly. Since the rotating rod 33 is not located at the axis of the turntable 32, the rotation of the rotating rod 33 will drive the second vibrating frame 8 to slide back and forth on the support 7 through the connecting rod 34. The third screening screen 9, which moves back and forth in the second vibrating frame 8, screens the granules after the rotary drum granulation. Particles with a diameter of 3.0mm to 4.75mm are sold as products, while particles smaller than 3.0mm are collected by the staff and returned to the rotary drum granulator 6 for granulation.
[0044] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. A fluidized bed granulation apparatus for urea granulation production, characterized in that, include: Fluidized bed body (1), and a first feed plate (2) is fixedly connected to one side of the fluidized bed body (1); The base (10) is provided on one side of the fluidized bed body (1). The first vibrating frame (3) is installed on the top of the base (10). The first vibrating frame (3) is fixedly connected to the inside of the first vibrating frame (3). The second vibrating frame (5) is installed inside the vibrating frame. A rotary drum granulator (6) is provided on one side of the base (10) for granulation. Support (7), a support (7) is provided on one side of the rotary drum granulator (6), a second vibrating frame (8) is slidably connected to the top of the support (7), and a third screening screen (9) is fixedly connected inside the second vibrating frame (8). The first drive assembly is mounted on the top of the base (10) for driving the first vibrating frame (3), the first screening screen (4), and the second screening screen (5); The second drive assembly is mounted on the top of the bracket (7) for driving the second vibration frame (8).
2. The fluidized bed granulation apparatus for urea granulation production according to claim 1, characterized in that, The first drive assembly includes: a first drive motor (21), a drive pulley (22), a rotating shaft (23), a driven pulley (24), and an eccentric block (25). The first drive motor (21) is mounted on the top of the base (10). The output end of the first drive motor (21) is fixedly connected to the drive pulley (22). The rotating shaft (23) is rotatably connected inside the first vibration frame (3). The driven pulley (24) is fixedly connected to one end of the rotating shaft (23) near the drive pulley (22). The drive pulley (22) and the driven pulley (24) are driven by a belt. The eccentric blocks (25) are symmetrically fixedly connected to both sides of the rotating shaft (23).
3. The fluidized bed granulation apparatus for urea granulation production according to claim 1, characterized in that, The second drive assembly includes: a second drive motor (31), a turntable (32), a rotating rod (33), and a connecting rod (34). The second drive motor (31) is fixedly connected to the top of the bracket (7). The turntable (32) is fixedly connected to the output end of the second drive motor (31). The rotating rod (33) is fixedly connected to one side of the turntable (32). The connecting rod (34) is rotatably connected to the outer wall of the rotating rod (33). The end of the connecting rod (34) away from the rotating rod (33) is rotatably connected to the second vibration frame (8).
4. The fluidized bed granulation apparatus for urea granulation production according to claim 2, characterized in that, A buffer seat (41) is fixedly connected to the top of the base (10). A rotating plate (42) is rotatably connected to the top of the buffer seat (41). The top of the rotating plate (42) is fixedly connected to the first drive motor (21). A sliding rod (43) is slidably connected to the top of the buffer seat (41). The sliding rod (43) passes through the top of the buffer seat (41) and slides inside the rotating plate (42). A tension spring (44) is sleeved on the outer wall of the sliding rod (43). One end of the tension spring (44) is fixedly connected to the buffer seat (41), and the other end of the tension spring (44) is fixedly connected to the sliding rod (43).
5. The fluidized bed granulation apparatus for urea granulation production according to claim 1, characterized in that, A vibration spring (51) is fixedly connected to the top of the base (10), and the top of the vibration spring (51) is fixedly connected to the first vibration frame (3).
6. The fluidized bed granulation apparatus for urea granulation production according to claim 1, characterized in that, The mesh diameters of the first screening mesh (4), the second screening mesh (5), and the third screening mesh (9) decrease progressively.
7. The fluidized bed granulation apparatus for urea granulation production according to claim 1, characterized in that, The first vibrating frame (3) is fixedly connected to a feeding trough (71) on the side near the rotary drum granulator (6), and a storage box (72) is provided on the side of the first vibrating frame (3) near the rotary drum granulator (6).