Improved cooling device of granulator

Abstract

The utility model relates to the technical field of coal synthesis ammonia and urea production, in particular to an improved cooling device of a pelletizer, which comprises a fluidization fan, one end of the fluidization fan is fixedly connected with a fluidization air inlet pipe, the other end of the fluidization fan is fixedly connected with a fluidization air outlet pipe, and one end of the fluidization air outlet pipe is fixedly connected with the pelletizer. One end of the pelletizer is fixedly connected with a molten urea pipe and a hopper discharging pipe, one end of the hopper discharging pipe is fixedly connected with an anti-blocking hopper assembly, the other end of the pelletizer is fixedly connected with a large-particle urea discharging pipe, the middle part of the fluidized air outlet pipe is fixedly connected with a CO2 pipe, one end of the CO2 pipe is fixedly connected with a CO2 desorption tower, and one end of the fluidized air outlet pipe is provided with an emptying pipe; according to the improved cooling device of the pelletizer, the emptying amount of CO2 gas is effectively reduced mainly through the arrangement of an improved circulating structure, environmental pollution is avoided, and the situation that equipment cannot operate due to blockage of raw materials is avoided through the arrangement of the anti-blocking hopper assembly.

Description

Technical Field

[0001] This utility model relates to the field of coal-to-synthetic ammonia and urea production technology, specifically to an improved cooling device for a granulator. Background Technology

[0002] A granulator for urea production is a machine used to produce uniform urea granules during urea production and processing.

[0003] In the coal-to-ammonia and urea production processes, CO2 byproducts are present in the syngas produced from coal. Furthermore, at excessively high temperatures, during the granulation process in the production of large-particle urea, some seed crystals become pulverized. This seed crystal powder adheres to the inner wall of the granulator drum, causing severe scaling and affecting the normal operation of the granulator. The pulverization of urea seed crystals significantly impacts the appearance quality of the large-particle finished product. Current common methods involve using a low-temperature methanol washing process to remove CO2 from the syngas, followed by a CO2 desorption tower to desorb the CO2 absorbed in the methanol. The desorbed CO2 gas has a temperature of approximately 25°C and a pressure of approximately 0.17 MPa. Most of this gas is used as feedstock for urea production, while the excess is vented directly, resulting in CO2 waste and environmental pollution. There is a lack of appropriate structures to reduce CO2 waste and maintain normal equipment operation, necessitating improvement and optimization. Utility Model Content

[0004] The purpose of this invention is to provide an improved cooling device for a granulator to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A granulator cooling improvement device includes a fluidizing blower, one end of which is fixedly connected to a fluidizing air inlet pipe, and the other end of which is fixedly connected to a fluidizing air outlet pipe. A granulator is fixedly connected to one end of the fluidizing air outlet pipe, one end of which is fixedly connected to a molten urea pipe and a hopper discharge pipe, one end of which is fixedly connected to an anti-clogging hopper assembly, and the other end of which is fixedly connected to a large-particle urea discharge pipe. A CO2 pipe is fixedly connected to the middle of the fluidizing air outlet pipe, one end of which is fixedly connected to a CO2 desorption tower, and one end of the fluidizing air outlet pipe is provided with a vent pipe.

[0006] Preferably, an automatic regulating valve is fixedly connected to the middle of the CO2 pipe, and a pressure gauge is fixedly connected to the middle of the fluidized air outlet pipe.

[0007] Preferably, a belt is provided above the anti-clogging hopper assembly.

[0008] Preferably, the anti-clogging hopper assembly includes a hopper, the lower end of which is fixedly connected to the hopper discharge pipe, and two sets of fixing grooves symmetrically arranged on both sides of the upper end of the hopper. A support rod is inserted into the fixing groove, and a motor is fixedly connected to the support rod. A rotating shaft is inserted into the lower end of the motor, and a stirring rod is fixedly connected to the middle of the rotating shaft. A connecting inclined rod is fixedly connected to one end of the stirring rod, and a scraping rubber strip is inserted into one end of the connecting inclined rod.

[0009] Preferably, a positioning pin is fixedly connected to the fixing groove, and a locking groove is provided in the middle of the positioning pin.

[0010] Preferably, the support rod has symmetrical positioning holes at both ends, and slots are provided in the positioning holes. Locking pins are movably inserted into the slots, and a first spring is fixedly connected to one end of the locking pin. The first spring is fixedly connected to the inner wall of the slot at one end.

[0011] Preferably, a pressing column is inserted into the slot, a second spring is fixedly connected to the middle of the pressing column, one end of the second spring is fixedly connected to the inner wall of the slot, and a pressing body is fixedly connected to one end of the pressing column.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] The improved cooling device for a granulator proposed in this utility model mainly reduces the amount of CO2 gas released by setting an improved circulation structure, thus avoiding environmental pollution. The anti-clogging hopper component also prevents the equipment from malfunctioning due to raw material blockage. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of an improved cooling device for a granulator;

[0015] Figure 2 A schematic diagram of the anti-clogging hopper assembly of a granulator cooling improvement device;

[0016] Figure 3 A structural disassembly diagram of the anti-clogging hopper assembly of a granulator cooling improvement device;

[0017] Figure 4 for Figure 3 Enlarged diagram of part A in the middle;

[0018] Figure 5 This is a partial cross-sectional view of the anti-clogging hopper assembly of a granulator cooling improvement device.

[0019] In the diagram: 1. Fluidizing blower; 2. Granulator; 3. Belt; 4. Anti-clogging hopper assembly; 401. Hopper; 402. Fixing groove; 403. Support rod; 404. Motor; 405. Rotating shaft; 406. Stirring rod; 407. Connecting inclined rod; 408. Scraping rubber strip; 409. Positioning pin; 410. Locking groove; 411. Positioning hole; 412. Slot; 413. Locking pin; 414. First spring; 415. Extrusion column; 416. Second spring; 417. Pressing body; 5. CO2 desorption tower; 6. Automatic regulating valve; 7. Pressure gauge; 8. Fluidizing air inlet pipe; 9. Fluidizing air outlet pipe; 10. Molten urea pipe; 11. Large particle urea discharge pipe; 12. CO2 pipe; 13. Vent pipe; 14. Hopper discharge pipe. Detailed Implementation

[0020] The technical solutions in the embodiments of this utility model will be clearly and completely described below. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] Please see Figures 1 to 5 This utility model provides two technical solutions:

[0022] Example 1: A cooling improvement device for a granulator includes a fluidizing blower 1. One end of the fluidizing blower 1 is fixedly connected to a fluidizing air inlet pipe 8, and the other end is fixedly connected to a fluidizing air outlet pipe 9. One end of the fluidizing air outlet pipe 9 is fixedly connected to a granulator 2. One end of the granulator 2 is fixedly connected to a molten urea pipe 10 and a hopper discharge pipe 14. One end of the hopper discharge pipe 14 is fixedly connected to an anti-clogging hopper assembly 4. The other end of the granulator 2 is fixedly connected to a large-particle urea discharge pipe 11. A CO2 pipe 12 is fixedly connected to the middle of the fluidizing air outlet pipe 9. One end of the CO2 pipe 12 is fixedly connected to a CO2 desorption tower 5. A vent pipe 13 is provided at one end of the fluidizing air outlet pipe 9. An automatic regulating valve 6 is fixedly connected to the middle of the CO2 pipe 12. A pressure gauge 7 is fixedly connected to the middle of the fluidizing air outlet pipe 9. A belt 3 is provided above the anti-clogging hopper assembly 4.

[0023] In operation, small urea particles, acting as seed crystals, are conveyed via belt 3 to the anti-clogging hopper assembly 4, and then through the hopper discharge pipe 14 to the granulator 2. Entering from one end of the granulator 2's drum, they are lifted and propelled onto the fluidized bed by the rotation of the lifting plates and drum, forming a uniform fluidized layer. Under the action of fluidizing air, the urea particles leave the bed surface from the lower end and fall down by gravity, forming a "material curtain." Molten urea is conveyed to the granulator 2 through the molten urea pipe 10, entering the molten urea main pipe from both ends of the granulator 2. Passing through specially designed molten urea nozzles evenly distributed on the main pipe, it is sprayed at a certain angle onto the urea "material curtain," uniformly coating the urea particles. It is then collected by the lifting plates below and moves axially with the rotation of the drum, continuously increasing in size until it reaches the specifications of large particles. Qualified large urea particles are conveyed to the next process through the large urea discharge pipe 11. The outlet end of the CO2 desorption tower 5 is connected to the CO2 pipe 12. CO2 gas desorbed from the CO2 desorption tower at a temperature of approximately 25°C and a pressure of approximately 0.17 MPa is transported to the fluidizing air through CO2 pipe 12, reducing the temperature of the fluidizing air entering the granulator. Pressure gauge 7 is used to monitor and control the pressure of the fluidizing air entering the granulator 2 at 0.007 MPa, providing a slight positive pressure for the granulator 2. Automatic regulating valve 6 and pressure gauge 7 are set up in an automatic regulating loop, which reduces the pressure of the CO2 gas desorbed from the CO2 desorption tower at a temperature of approximately 25°C and a pressure of approximately 0.17 MPa to 0.007 MPa before sending it into the fluidizing air. Vent pipe 13 is used to vent the fluidizing air in case of system abnormalities. The fluidizing air provides power for the fluidization of urea particles while also being in a good gas-solid phase heat transfer state with the fluidized urea particles, timely removing the crystallization heat and sensible heat of urea, so that the temperature of the large urea particles exiting the granulator drops to about 90°C.

[0024] Example 2: Based on Example 1, the anti-clogging hopper assembly 4 includes a hopper 401. The lower end of the hopper 401 is fixedly connected to the hopper discharge pipe 14. Two sets of fixing grooves 402 are symmetrically arranged on both sides of the upper end of the hopper 401. A support rod 403 is inserted into the fixing groove 402. A motor 404 is fixedly connected to the support rod 403. A rotating shaft 405 is inserted into the lower end of the motor 404. A stirring rod 406 is fixedly connected to the middle of the rotating shaft 405. A connecting inclined rod 407 is fixedly connected to one end of the stirring rod 406. A scraping rubber strip 408 is inserted into one end of the connecting inclined rod 407. A positioning pin is fixedly connected to the fixing groove 402. 409, the positioning pin 409 has a locking groove 410 in the middle; the support rod 403 has positioning holes 411 symmetrically provided at both ends, the positioning holes 411 have slots 412 in the positioning holes 411, the slots 412 are movably inserted with locking pins 413, one end of the locking pin 413 is fixedly connected with a first spring 414, one end of the first spring 414 is fixedly connected with the inner wall of the slot 412; a pressing column 415 is inserted into the slot 412, the middle of the pressing column 415 is fixedly connected with a second spring 416, one end of the second spring 416 is fixedly connected with the inner wall of the slot 412, and one end of the pressing column 415 is fixedly connected with a pressing body 417.

[0025] In use, the motor 404 on the anti-clogging hopper assembly 4 drives the rotating shaft 405 to rotate, and the rotating shaft 405 drives the stirring rod 406 and the scraping rubber strip 408 to rotate. The rotation of the stirring rod 406 prevents the bottom of the hopper 401 from becoming clogged. The scraping rubber strip 408 rotates close to the hopper 401 to scrape the inner wall of the hopper 401 to prevent particles from sticking to the wall. When installing the support rod 403, the positioning hole 411 is aligned with the positioning pin 409 and inserted. The first spring 414 squeezes the locking pin 413 and inserts it into the locking groove 410 on the positioning pin 409 to lock it. When disassembling, the pressing body 417 is pressed at the same time, and the pressing column 415 squeezes the inclined surface in the middle of the locking pin 413 to make the locking pin 413 disengage from the locking groove 410 and pull the support rod 403 upward to complete the disassembly.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A granulator cooling improvement device characterized by: The utility model relates to a kind of urea production equipment, including fluidization fan (1), one end of the fluidization fan (1) is fixedly connected with fluidization air inlet pipe (8), the other end of the fluidization fan (1) is fixedly connected with fluidization air outlet pipe (9), one end of the fluidization air outlet pipe (9) is fixedly connected with granulator (2), one end of the granulator (2) is fixedly connected with molten urea pipe (10) and hopper discharge pipe (14), one end of the hopper discharge pipe (14) is fixedly connected with anti-blocking hopper assembly (4), the other end of the granulator (2) is fixedly connected with large particle urea discharge pipe (11), middle part of the fluidization air outlet pipe (9) is fixedly connected with CO2 pipe (12), one end of the CO2 pipe (12) is fixedly connected with CO2 desorption tower (5), one end of the fluidization air outlet pipe (9) is equipped with vent pipe (13).

2. A granulator cooling improvement device according to claim 1, characterized in that: Middle part of the CO2 pipe (12) is fixedly connected with automatic regulating valve (6), middle part of the fluidization air outlet pipe (9) is fixedly connected with pressure gauge (7).

3. A granulator cooling improvement device according to claim 1, characterized in that: The anti-blocking hopper assembly (4) is equipped with a belt (3) above.

4. A granulator cooling improvement device according to claim 1, characterized in that: The anti-blocking hopper assembly (4) includes hopper (401), the lower end of the hopper (401) is fixedly connected to hopper discharge pipe (14), the upper end of the hopper (401) is symmetrically provided with two groups of fixed slots (402), the fixed slots (402) are inserted with support rods (403), the support rods (403) are fixedly connected with motors (404), the lower end of the motors (404) is inserted with rotating shafts (405), the rotating shafts (405) are fixedly connected with stirring rods (406) in the middle part, one end of the stirring rods (406) is fixedly connected with connecting inclined rods (407), one end of the connecting inclined rods (407) is inserted with sweeping and scraping rubber strips (408).

5. A granulator cooling improvement device according to claim 4, characterized in that: The fixed slots (402) are fixedly connected with positioning pins (409), and the positioning pins (409) are provided with locking grooves (410) in the middle part.

6. A pellet cooler improvement device according to claim 4, characterized in that: The support rods (403) are symmetrically provided with positioning holes (411) at both ends, the positioning holes (411) are provided with insertion grooves (412) inside, the insertion grooves (412) are movably inserted with locking pins (413), one end of the locking pins (413) is fixedly connected with first springs (414), and one end of the first springs (414) is fixedly connected to the inner wall of the insertion groove (412).

7. A pellet cooler improvement device according to claim 6, characterized in that: The insertion groove (412) is inserted with extrusion cylinders (415), the extrusion cylinders (415) are fixedly connected with second springs (416) in the middle part, one end of the second springs (416) is fixedly connected to the inner wall of the insertion groove (412), and one end of the extrusion cylinders (415) is fixedly connected with pressing bodies (417).

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