A drum fluidized bed granulator

Abstract

The utility model discloses a kind of roller fluidized bed granulator, it is related to the technical field of granulator, including fluidized bed, the outside of fluidized bed is equipped with roller, the front end of roller is provided with feed inlet, the bottom end of feed inlet is inserted inside roller, the fluidized bed includes fluidizing gas pipe, gas distribution chamber, back plate, gas distribution plate, front plate and curtain adjusting plate, the gas distribution chamber is set above fluidizing gas pipe, the utility model is equipped by the setting of fluidizing gas pipe and gas distribution chamber, gas distribution chamber receives the fluidizing air of fluidizing gas pipe input, it is evenly distributed to subsequent gas distribution structure, solve the problem of insufficient original air intake, poor cooling effect, provide sufficient gas source for material cooling, cooperate with gas distribution plate and guide material to be evenly distributed on plate, avoid the air output from upper air hole of gas distribution chamber, improve gas utilization, strengthen the cooling effect of material particle.

Description

Technical Field

[0001] This utility model relates to the field of granulator technology, and in particular to a drum fluidized bed granulator. Background Technology

[0002] Currently, the main production methods for nitro compound fertilizers such as large-particle ammonium nitrate, calcium ammonium nitrate, and ammonium nitrate phosphate in China are high-tower granulation and drum fluidized bed granulation. High-tower granulation has disadvantages such as large investment in production equipment, small particle size, poor particle strength, easy agglomeration, and poor appearance. Drum fluidized bed granulation technology has the advantages of large particle size, high particle strength, good particle roundness, and less agglomeration.

[0003] In the rotary fluidized bed melt granulation process, the factors affecting granulation include: the atomization state of the fluidized bed, the fluidizing air volume, the spraying pressure, the concentration and temperature of the slurry, the granulation temperature, the tilt angle of the drum, the rotation speed of the drum, the height of the baffle plate, the ambient temperature, and the return ratio. The fluidized bed is the core component of the rotary fluidized bed granulator, and the atomization state of the fluidized bed liquid nozzle, the spraying pressure, and the fluidizing air volume directly affect the granulation quality and output within the granulator.

[0004] However, in the existing technology, the existing rotary fluidized bed granulator, designed and manufactured for an annual output of 100,000 tons, is prone to slurry adhering to the granulator's lifting plates and inner shell wall during operation, crystallizing and forming scales. Some of these scales fall off and form lumps. After being lifted by the lifting plates, these lumps fall onto the fluidized bed gas distribution plate and then roll down between the lower part of the fluidized bed gas distribution plate and the material curtain regulating plate, causing blockages and affecting the formation of the material curtain. At the same time, the liquid nozzles are prone to clogging, affecting the spraying of the slurry. It is necessary to stop the machine regularly to clean the internal lumps and scales and clean the blocked liquid nozzles, which affects the long-term normal operation of the equipment and the quality and output of granulation. Utility Model Content

[0005] The purpose of this invention is to solve the problems of scaling, clumping, and easy clogging of the liquid nozzle in the operation of existing equipment, and to propose a drum fluidized bed granulator.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a drum fluidized bed granulator, comprising a fluidized bed, a drum sleeved on the outside of the fluidized bed, a feed inlet at the front end of the drum, the bottom end of the feed inlet inserted into the interior of the drum, the fluidized bed comprising a fluidizing gas pipe, a gas distribution chamber, a rear side plate, a gas distribution plate, a front side plate, and a material curtain adjusting plate, the gas distribution chamber being disposed above the fluidizing gas pipe, the bottom ends of the rear side plate and the front side plate being fixedly connected to the side wall of the fluidizing gas pipe, the gas distribution plate being fixedly connected to the top ends of the rear side plate and the front side plate, the material curtain adjusting plate being movably installed on the top surface of the gas distribution plate, a liquid feed pipe disposed below the front side plate, a steam pipe being fixedly connected to the bottom surface of the liquid feed pipe, an insulation pipe sleeved on the outer wall of the liquid feed pipe, a connecting pipe being fixedly connected to one side of the liquid feed pipe, a liquid feed nozzle being installed at one end of the connecting pipe, and an insulation jacket being sleeved on the outer wall of the connecting pipe.

[0007] Preferably, a feed box is fitted on the outer wall of the front end of the roller, a sealing device is provided between the feed box and the outer wall of the roller, and multiple sets of lifting plates are installed on the inner wall of the roller.

[0008] Preferably, an inner return spiral tube is fixedly connected to the inner wall of the drum, a baffle is fixedly connected to the outer wall of the tail end of the inner return spiral tube, a cleaning port is opened on the outer wall of the inner return spiral tube, a feed baffle is fixedly connected to the inner wall of the front end of the drum, a guide spiral plate is provided on one side of the feed baffle, a gap of 300mm is provided between the feed baffle and the guide spiral plate, and the guide spiral plate is fixedly connected to the inner wall of the drum.

[0009] Preferably, the outer wall of the roller is fixedly fitted with a first rolling ring and a second rolling ring. The bottom surface of the first rolling ring is connected to a support device, the bottom surface of the roller is connected to a stop wheel device, the outer wall of the roller is fixedly connected with a large gear ring, the bottom surface of the large gear ring is meshed with a small gear assembly, and a transmission device is provided below the roller. The output shaft end of the transmission device is connected to the small gear assembly.

[0010] Preferably, the lifting plates are set in segments on the inner wall of the drum, with the front lifting plate having an inclination angle of 2°, the middle lifting plate having an inclination angle of 3°, and the rear lifting plate having an inclination angle of 4°.

[0011] Preferably, hand holes are provided every 1 meter along the length of the outer wall of the rear side plate and the front side plate, and a cover plate two is provided on the outside of the hand holes, and the cover plate two is installed on the outer wall of the rear side plate and the front side plate.

[0012] Preferably, a cleaning port is provided through the inner wall of the tail end of the roller, and a cover plate is provided outside the cleaning port. The cover plate is fixed to the outer wall of the roller by bolts.

[0013] Preferably, a vibrator is installed on the outer wall of the roller, and a discharge box is provided at the tail end of the roller.

[0014] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0015] 1. In this utility model, by setting up a fluidizing gas pipe and a gas distribution chamber, the gas chamber receives the fluidizing air input from the fluidizing gas pipe and distributes it evenly to the subsequent gas distribution structure, which solves the problems of insufficient air intake and poor cooling effect in the original system, provides sufficient gas source for material cooling, and guides the material to be evenly distributed on the plate in conjunction with the gas distribution plate, avoiding the loss of air output from the gas distribution chamber from the upper holes, improving gas utilization rate, and enhancing the cooling effect on material particles.

[0016] 2. In this utility model, a liquid feed pipe is used to transport high-concentration nitric acid compound fertilizer molten liquid. The heat insulation pipe sleeved on the outer wall of the liquid feed pipe can initially maintain the temperature of the liquid feed. A heat insulation jacket is sleeved on the outer wall of a connecting pipe connected to one side of the liquid feed pipe. The heat insulation jacket is connected to a steam pipe. Steam can enter the heat insulation jacket through the steam pipe to continuously heat and keep the connecting pipe warm, preventing the liquid feed from cooling to the crystallization temperature in the connecting pipe. This solves the problem of liquid feed nozzle blockage from the source and ensures stable liquid feed spraying.

[0017] 3. In this utility model, by setting the segmented tilt angle of the lifting plate, the residence time of the material in different areas of the drum can be precisely controlled: the small tilt angle in the front section slows down the material movement speed, allowing the seed particles to be fully coated by the liquid; the medium tilt angle in the middle section maintains stable material flow and ensures uniform granulation; the large tilt angle in the rear section accelerates material movement, and combined with the extended cooling length, achieves efficient cooling, ultimately improving the roundness and strength of the product particles. Attached Figure Description

[0018] Figure 1 This utility model provides a structural schematic diagram of a drum fluidized bed granulator;

[0019] Figure 2 This utility model provides an unfolded view of the drum of a drum fluidized bed granulator;

[0020] Figure 3 This utility model provides a schematic diagram of the fluidized bed end face structure of a drum fluidized bed granulator;

[0021] Figure 4 This utility model provides a structural schematic diagram of a baffle for a drum fluidized bed granulator;

[0022] Figure 5 This utility model provides a schematic diagram of the insulation structure of a drum fluidized bed granulator;

[0023] Figure 6 This utility model provides a schematic diagram of the lifting plate structure of a drum fluidized bed granulator;

[0024] Figure 7 This utility model provides a schematic diagram of the gap between the feed baffle and the guide spiral plate of a drum fluidized bed granulator;

[0025] Figure 8 This utility model provides a schematic diagram of the cleaning hole of a drum fluidized bed granulator;

[0026] Figure 9 This utility model provides a schematic diagram of the hand hole of a drum fluidized bed granulator.

[0027] Legend: 1. Fluidized bed; 101. Fluidizing gas pipe; 102. Gas distribution chamber; 103. Rear side plate; 104. Gas distribution plate; 105. Front side plate; 106. Material curtain adjusting plate; 2. Feed inlet; 3. Feed box; 4. Sealing device; 5. Roller ring one; 6. Inner return spiral pipe; 601. Baffle; 7. Vibrator; 8. Drum; 9. Large gear ring; 10. Roller ring two; 11. Discharge box ; 12. Baffle wheel device; 13. Pinion gear assembly; 14. Transmission device; 15. Support device; 16. Feed baffle plate; 17. Guide spiral plate; 18. Cleaning port; 19. Lifting plate; 20. Cleaning port; 21. Steam pipe; 22. Liquid pipe; 23. Liquid nozzle; 24. Connecting pipe; 25. Insulation pipe; 26. Insulation jacket; 27. Cover plate one; 28. Hand hole; 29. ​​Cover plate two. Detailed Implementation

[0028] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0030] Example 1: As Figure 1 - Figure 9As shown, this utility model provides a rotary fluidized bed granulator, including a fluidized bed 1, with a drum 8 sleeved on the outside of the fluidized bed 1. A feed inlet 2 is provided at the front end of the drum 8, and the bottom end of the feed inlet 2 is inserted into the interior of the drum 8. The fluidized bed 1 includes a fluidizing gas pipe 101, a gas distribution chamber 102, a rear side plate 103, a gas distribution plate 104, a front side plate 105, and a material curtain adjusting plate 106. The gas distribution chamber 102 is located above the fluidizing gas pipe 101. The bottom ends of the rear side plate 103 and the front side plate 105 are fixedly connected to the side wall of the fluidizing gas pipe 101. The gas distribution plate 104 is fixedly connected to the top ends of the rear side plate 103 and the front side plate 105. The material curtain adjustment plate 106 is movably installed on the top surface of the gas distribution plate 104. A material pipe 22 is provided below the front side plate 105. A steam pipe 21 is fixedly connected to the bottom surface of the material pipe 22. An insulation pipe 25 is sleeved on the outer wall of the material pipe 22. A connecting pipe 24 is fixedly connected to one side of the material pipe 22. A material nozzle 23 is installed at one end of the connecting pipe 24. An insulation jacket 26 is sleeved on the outer wall of the connecting pipe 24. Hand holes 28 are opened every 1 meter along the length direction on the outer walls of the rear side plate 103 and the front side plate 105. A cover plate 29 is provided on the outside of the hand holes 28. The cover plate 29 is installed on the outer walls of the rear side plate 103 and the front side plate 105.

[0031] The specific settings and functions of this embodiment are described below. The fluidizing air pipe 101 adopts a φ1016×10mm specification, which significantly increases the air intake volume compared to the original pipe diameter. The air distribution chamber 102 receives the fluidizing air input from the fluidizing air pipe 101 and distributes it evenly to the subsequent gas distribution structure, solving the problems of insufficient air intake and poor cooling effect in the original system, and providing a sufficient air source for material cooling. The angle between the gas distribution plate 104 and the horizontal plane is controlled at 25°-30°, which avoids material stagnation due to too small an angle and also prevents material residence time from being too short due to too large an angle. At the same time, the number of gas distribution holes in the upper 1 / 3 area of ​​the gas distribution plate 104 is reduced by 50%, and the number of holes in the lower 2 / 3 area is increased accordingly, which can guide the material to be evenly distributed on the plate, prevent the air output from the air distribution chamber 102 from being lost through the upper holes, improve gas utilization, and enhance the cooling effect on material particles. The material curtain adjustment plate 106 can be adjusted according to the material quantity and material curtain thickness. The device allows for flexible adjustment of the position and auxiliary control of the material curtain shape, ensuring that the liquid material accurately coats the surface of the material curtain particles, reducing material waste or sticking to the wall. The liquid material pipe 22 is used to transport high-concentration nitric acid compound fertilizer molten liquid, and the heat-insulating pipe 25 on its outer wall can initially maintain the temperature of the liquid material. The connecting pipe 24 connected to one side of the liquid material pipe 22 is fitted with a heat-insulating jacket 26 on its outer wall, and the heat-insulating jacket 26 is connected to the steam pipe 21. Steam can enter the heat-insulating jacket 26 through the steam pipe 21 to continuously heat and insulate the connecting pipe 24, preventing the liquid material from cooling to the crystallization temperature in the connecting pipe 24. This solves the problem of blockage of the liquid material nozzle 23 from the source and ensures stable spraying of the liquid material. The manhole 28 is designed so that the cover plate 29 can close the manhole 28 during normal operation of the device, ensuring the fluidized bed is sealed. When shutting down for cleaning, the cover plate 29 can be opened to clean the leaked material in the gas distribution chamber 102 through the manhole 28, avoiding the formation of cleaning dead corners and reducing shutdown cleaning time.

[0032] Example 2: Figure 1 - Figure 9As shown, a feed box 3 is fitted onto the outer wall of the front end of the roller 8. A sealing device 4 is provided between the feed box 3 and the outer wall of the roller 8. Multiple sets of lifting plates 19 are installed on the inner wall of the roller 8. The lifting plates 19 are segmented on the inner wall of the roller 8, with the front section of the lifting plates 19 having an inclination angle of 2°, the middle section having an inclination angle of 3°, and the rear section having an inclination angle of 4°. An inner return spiral tube 6 is fixedly connected to the inner wall of the roller 8. A baffle 601 is fixedly connected to the outer wall of the tail end of the inner return spiral tube 6. A cleaning port 20 is opened on the outer wall of the inner return spiral tube 6. A feed baffle 16 is fixedly connected to the inner wall of the front end of the roller 8. A guide spiral plate 17 is provided on one side of the feed baffle 16. A 300mm width gap is provided between the feed baffle 16 and the guide spiral plate 17. The gap is filled. The guide spiral plate 17 is fixedly connected to the inner wall of the drum 8. Roller ring 1 5 and roller ring 2 10 are fixedly sleeved on the outer wall of the drum 8. The bottom surface of roller ring 1 5 is connected to the support device 15. The bottom surface of the drum 8 is connected to the thrust wheel device 12. The outer wall of the drum 8 is fixedly connected to the large gear ring 9. The bottom surface of the large gear ring 9 is connected to the small gear combination 13. The bottom of the drum 8 is connected to the transmission device 14. The output shaft end of the transmission device 14 is connected to the small gear combination 13. The inner wall of the tail end of the drum 8 is provided with a cleaning port 18. The outside of the cleaning port 18 is provided with a cover plate 27. The cover plate 27 is fixed to the outer wall of the drum 8 by bolts. The outer wall of the drum 8 is equipped with a vibrator 7. The tail end of the drum 8 is provided with a discharge box 11.

[0033] The overall effect of this embodiment is that the feed box 3 is fitted onto the outer wall of the front end of the drum 8, providing a transition space for the seed crystals conveyed by the feed inlet 2; the sealing device 4 between the two can prevent air and material leakage when the drum 8 rotates, ensuring a stable fluidization environment inside the drum, avoiding material waste and pollution of the production environment; by setting the lifting plate 19 with an inclination angle of 2° for the first 1-3 turns, 3° for the middle 4-6 turns, and 4° for the rear 7-12 turns, the residence time of the material in different areas of the drum 8 can be precisely controlled: the small inclination angle at the front slows down the material movement speed, allowing the seed crystal particles to fully receive the liquid coating; the medium inclination angle at the middle maintains stable material flow and ensures uniform granulation; the large inclination angle at the rear accelerates material movement, and with the extended cooling length, achieves efficient cooling, ultimately improving the roundness and strength of the product particles; the inner return spiral tube 6 is fixed to the inner wall of the drum 8, used to transport the small-diameter particles at the bottom of the discharge end of the drum 8 back to the feed end; because the lifting plate 19 moves forward 0.8 meters, and the inner return spiral tube 6 moves forward synchronously. The baffle 601 fixed on the outer wall of its tail end can prevent the return material from being thrown into the feed box 3 due to inertia, completely solving the problem of material leakage and improving the material recovery rate. Through the feed baffle 16 and the guide spiral plate 17, the guide spiral plate 17 can guide the seed crystals input from the feed port 2 to be evenly dispersed into the inside of the drum 8. The feed baffle 16 prevents the material from flowing back. The 300mm gap avoids the formation of a cleaning dead corner between the two, reduces material agglomeration and reduces the difficulty of cleaning after shutdown. Through the setting of the cleaning port 18, after shutdown, the cover plate 27 can be opened, and the residual material inside the drum 8 can be directly cleaned through the cleaning port 18. The vibrator 7 installed on the outer wall of the drum 8 can slightly vibrate the drum wall during operation, reducing the material from sticking to the inner wall of the drum 8 and forming scars, which helps to improve the granulation quality and reduce the difficulty of cleaning. The discharge box 11 is set at the tail end of the drum 8 to receive qualified particles and transport them to the subsequent screening stage.

[0034] The operation and working principle of this device are as follows: Seed granules are fed into the drum 8 through the feed inlet 2, and the seeds are evenly dispersed by the guide spiral plate 17. The transmission device 14 is activated, driving the small gear assembly 13 to mesh with the large gear ring 9, causing the drum 8 to rotate at a set speed. Simultaneously, the fluidizing fan is activated, allowing fluidizing air to enter the gas distribution chamber 102 through the fluidizing gas pipe 101, and then forming a uniform airflow through the distribution holes of the gas distribution plate 104. The liquid pump is activated, transporting the high-concentration nitric acid compound fertilizer molten liquid through the liquid pipe 22 and connecting pipe 24 to the liquid nozzle 23, forming atomized droplets. During granulation, the formation of the material curtain inside the drum 8 is observed, and the thickness of the material curtain is finely adjusted using the material curtain adjustment plate 106. The material outlet temperature of the drum is monitored using a temperature sensor; if the temperature is too high, the airflow in the fluidizing gas pipe 101 can be appropriately increased. The liquid nozzle is observed. 23. During the spraying process, if signs of impending blockage appear, such as uneven spraying, check if the steam supply to the insulation jacket 26 is normal. Larger particles on the upper layer of the compliant granules enter the discharge box 11 through the grading structure at the tail end of the drum 8 and are then conveyed to the drum screen for sieving. After sieving, particles meeting the required size enter the cooling stage. Particles that are too large are crushed by the crusher and returned to the feed inlet 2, while particles that are too small are directly returned to the feed inlet 2. Smaller particles at the bottom of the discharge end of the drum 8 return to the feed end through the internal return spiral pipe 6, achieving material circulation granulation. After the equipment stops, turn off the steam supply and all power devices. Open the second cover plate 29 and clean the leaked material in the gas distribution chamber 102 through the handhole 28. Open the first cover plate 27 and clean the residual material and small amount of scale inside the drum 8 through the cleaning port 18. If there is a lot of material adhering to the inner wall of the drum 8, the vibrator 7 can be activated to assist in cleaning.

[0035] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A rotary fluidized bed granulator, comprising a fluidized bed (1), characterized in that: The fluidized bed (1) is fitted with a roller (8) on its outside. The front end of the roller (8) is provided with a feed inlet (2), and the bottom end of the feed inlet (2) is inserted into the interior of the roller (8). The fluidized bed (1) includes a fluidizing gas pipe (101), a gas distribution chamber (102), a rear side plate (103), a gas distribution plate (104), a front side plate (105), and a material curtain adjusting plate (106). The gas distribution chamber (102) is located above the fluidizing gas pipe (101). The bottom ends of the rear side plate (103) and the front side plate (105) are fixedly connected to the side wall of the fluidizing gas pipe (101). The gas distribution plate (104) is fixedly connected to the side wall of the fluidizing gas pipe (101). 04) The material curtain adjustment plate (106) is fixedly connected to the top of the rear side plate (103) and the front side plate (105). The material curtain adjustment plate (106) is movably installed on the top surface of the gas distribution plate (104). A material pipe (22) is provided below the front side plate (105). A steam pipe (21) is fixedly connected to the bottom surface of the material pipe (22). A heat insulation pipe (25) is sleeved on the outer wall of the material pipe (22). A connecting pipe (24) is fixedly connected to one side of the material pipe (22). A material nozzle (23) is installed at one end of the connecting pipe (24). A heat insulation jacket (26) is sleeved on the outer wall of the connecting pipe (24).

2. The rotary fluidized bed granulator according to claim 1, characterized in that: The front end of the roller (8) is fitted with a feed box (3), and a sealing device (4) is provided between the feed box (3) and the outer wall of the roller (8). Multiple sets of lifting plates (19) are installed on the inner wall of the roller (8).

3. A rotary fluidized bed granulator according to claim 2, characterized in that: The inner wall of the roller (8) is fixedly connected to an inner return spiral tube (6), and a baffle (601) is fixedly connected to the outer wall of the tail end of the inner return spiral tube (6). A cleaning port (20) is opened on the outer wall of the inner return spiral tube (6). A feed baffle (16) is fixedly connected to the inner wall of the front end of the roller (8). A guide spiral plate (17) is provided on one side of the feed baffle (16). A gap of 300mm is provided between the feed baffle (16) and the guide spiral plate (17). The guide spiral plate (17) is fixedly connected to the inner wall of the roller (8).

4. A rotary fluidized bed granulator according to claim 3, characterized in that: Roller (8) is fixedly fitted with a first rolling ring (5) and a second rolling ring (10). The bottom surface of the first rolling ring (5) is connected to a support device (15). The bottom surface of the roller (8) is connected to a wheel stop device (12). The outer wall of the roller (8) is fixedly connected with a large gear ring (9). The bottom surface of the large gear ring (9) is connected to a small gear assembly (13). A transmission device (14) is provided below the roller (8). The output shaft end of the transmission device (14) is connected to the small gear assembly (13).

5. A rotary fluidized bed granulator according to claim 2, characterized in that: The lifting plates (19) are set in sections on the inner wall of the drum (8). The lifting plate (19) in the front section has an inclination angle of 2°, the lifting plate (19) in the middle section has an inclination angle of 3°, and the lifting plate (19) in the rear section has an inclination angle of 4°.

6. A rotary fluidized bed granulator according to claim 1, characterized in that: Hand holes (28) are provided every 1 meter along the length of the outer walls of the rear side plate (103) and the front side plate (105). A cover plate (29) is provided on the outside of the hand holes (28). The cover plate (29) is installed on the outer walls of the rear side plate (103) and the front side plate (105).

7. A rotary fluidized bed granulator according to claim 1, characterized in that: A cleaning port (18) is provided through the inner wall of the tail end of the roller (8), and a cover plate (27) is provided on the outside of the cleaning port (18). The cover plate (27) is fixed to the outer wall of the roller (8) by bolts.

8. A rotary fluidized bed granulator according to claim 1, characterized in that: The outer wall of the roller (8) is equipped with a vibrator (7), and the tail end of the roller (8) is provided with a discharge box (11).

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