Urea particle recovery device

Abstract

The utility model relates to the field of chemical engineering, in particular to a urea particle recovery device, which is characterized in that urea particles scattered outside a lower air window of a granulation tower are introduced into a recovery tank through a collecting pipe, and the recovery tank is also connected with a desalted water pipeline for dissolving the urea particles; a stirring assembly is coaxially arranged in the recovery tank, the exterior of a tank body of the recovery tank and / or the stirring assembly is connected with a heat source to heat urea particles, and an openable and closable recovery pipeline is further arranged at the bottom of the recovery tank to recover a urea solution. According to the utility model, the urea particles are recycled, the production ammonia consumption is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of chemical industry, in particular to a urea particle recovery device. Background Art

[0002] Granulation tower, also known as tower crystallizer, is used for the production of urea and ammonium nitrate crystals in nitrogen fertilizer plants. In urea production, molten urine is beaten into the granulation tower, and the granulation nozzle rotates. The granulation nozzle has small holes of equal diameter, and the molten urine is sprayed out from the small holes. The granulation tower is divided into upper and lower wind windows to form convection wind to cool the molten urea particles. Urea particles are formed by falling and cooling through the granulation tower. Due to ventilation problems, the lower wind window of the granulation tower needs to be opened. Due to the centrifugal force problem of the nozzle, some urea particles fly out of the granulation tower from the lower wind window and scatter on the bottom of the granulation tower.

[0003] Scattered urea particles can easily cause environmental pollution, and if the scattered particles are not recovered, the ammonia consumption in production will be greatly increased, resulting in waste and reducing production efficiency, so it is urgent to solve the problem. Summary of the invention

[0004] In order to avoid and overcome the technical problems existing in the prior art, the utility model provides a urea particle recovery device. The utility model realizes the recovery of urea particles, reduces the production ammonia consumption, and improves the production efficiency.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A urea particle recovery device, wherein urea particles scattered outside a wind window below a granulation tower are passed into a recovery tank through a collecting pipe, and the recovery tank is also connected to a desalted water pipeline for dissolving the urea particles; a stirring assembly is coaxially arranged in the recovery tank, the tank body of the recovery tank and / or the stirring assembly are connected to a heat source to heat the urea particles, and an openable and closable recovery pipeline is also arranged at the bottom of the recovery tank to recover the urea solution.

[0007] As a further solution of the utility model: the stirring assembly includes a stirring shaft arranged coaxially with the recovery tank, stirring rods are evenly spaced along the length direction of the stirring shaft, and the stirring shaft and each stirring rod are arranged in a hollow shape; an outer coil is arranged outside the tank body of the recovery tank, and the outer coil and the stirring shaft are connected to the return pipeline; the heat source is split after passing through the heating pipeline, and a part of the split enters the return pipeline after passing through the outer coil, and the other part of the split passes through the stirring rod and the stirring shaft in turn and enters the return pipeline.

[0008] As a further solution of the utility model: the end of the stirring rod away from the stirring shaft is the heat source inlet, and a rotary joint is coaxially arranged in the recovery tank. After the heat supply pipeline is diverted, it is connected to the diversion pipe through the rotary joint. The diversion pipe is U-shaped, and diversion ports corresponding to the number of stirring rods are opened on the diversion pipe, and each diversion port is connected to the heat source inlet of each stirring rod.

[0009] As a further solution of the utility model: one end of the stirring shaft extends outside the recovery tank, and the stirring shaft is coaxially fixed with a driven gear on the shaft body of the recovery tank, the recovery tank is equipped with a drive motor, the motor shaft of the drive motor is arranged parallel to the stirring shaft, and a driving gear meshing with the driven gear is coaxially fixed on the motor shaft of the drive motor.

[0010] As a further solution of the utility model: solenoid valves are installed on the desalted water pipeline, the heating pipeline and the reflux pipeline to adjust the pipeline flow, and a temperature sensor and a liquid level sensor are installed in the recovery tank.

[0011] As a further solution of the utility model: an inclined chute is arranged at the bottom of the downwind window of the granulation tower, and the pipe mouth of the collecting pipe is connected with the bottom of the inclined chute.

[0012] As a further solution of the utility model: a centrifugal pump for conveying urea solution is installed on the recovery pipeline.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The utility model collects the urea particles scattered outside the wind window under the granulation tower and passes them into the recovery tank. After double heating inside and outside, they are dissolved and stirred by passing desalted water to become urea solution again. After being recovered through the recovery pipeline, they enter the urea tank of the production system for reuse, thereby realizing the recovery of urea particles, reducing production ammonia consumption, and improving production efficiency.

[0015] 2. The utility model sets the stirring shaft and stirring rod in the recovery tank to be hollow and connected. After being connected with the heat source, the stirring system can be heated by the heat source, thereby improving the melting rate of urea particles. In addition, a heat coil is arranged outside the recovery tank. After the heat source is diverted through the heating pipeline, it passes through the stirring shaft and the heat coil respectively, thereby performing double heating on the recovery tank inside and outside, thereby greatly improving the recovery rate.

[0016] 3. The stirring shaft of the utility model is connected to the recovery tank through a rotary joint, and the heat source can be evenly distributed while rotating; the end of the stirring shaft extends outside the recovery tank and is directly connected to the reflux pipeline. The stirring shaft is driven to rotate by the driving motor through gear meshing, so as to avoid interference between the end thereof and the power source when transporting the heat source.

[0017] 4. The utility model sets the bottom of the wind window under the granulation tower as an inclined chute to facilitate the collection of urea particles; when working, the flow of the heat source is adjusted according to the change of temperature, and the opening and closing of the centrifugal pump on the recovery pipeline is controlled according to the liquid level in the recovery tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a structural schematic diagram of the utility model.

[0019] In the figure: 1, granulation tower; 11, collection pipe;

[0020] 2. Recovery tank; 21. External coil; 22. Agitator shaft; 221. Driven gear;

[0021] 23. Stirring rod; 24. Diverter tube; 25. Rotary joint;

[0022] 26. Driving motor; 261. Driving gear;

[0023] 3. Heating pipeline; 4. Desalted water pipeline; 5. Reflux pipeline; 6. Recovery pipeline. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1 In the embodiment of the utility model, a urea particle recovery device is provided, a four-degree inclined chute is provided at the bottom of the downwind window of the granulation tower 1, a collecting pipe 11 is arranged at the bottom of the inclined chute, and the urea particles are discharged into the recovery tank 2 after passing through the collecting pipe 11. A desalted water pipeline 4 is connected to the top of the recovery tank 2.

[0026] The outer circle of the recovery tank 2 is arranged with a spirally distributed outer coil 21, and a stirring shaft 22 is coaxially installed in the recovery tank 2. Stirring rods 23 are evenly spaced along the length direction on the stirring shaft 22, and the stirring rods 23 are arranged horizontally. The stirring shaft 22 and the stirring rods 23 are both hollow, and the hollow cavities are connected to each other.

[0027] A rotating joint 25 is coaxially installed at the bottom of the recovery tank 2, and a U-shaped diverter tube 24 is coaxially fixed on the rotating joint 25. Diverter ports are arranged inside the diverter tube 24, and each diverter port is connected to an opening on the side of the stirring rod 23 away from the stirring shaft 22. The top of the stirring shaft 22 extends to the outside of the recovery tank 2.

[0028] After the heating pipeline 3 is split, it is connected to the outer coil 21 and the rotary joint 25 respectively. After the heat source passes through the heating pipeline 3, a part of it is split and passed into the outer coil 21, and the other part passes through the rotary joint 25, the split pipe 24, the stirring rod 23 and the stirring shaft 22 in turn. After leaving the outer coil 21 and the stirring shaft 22, the heat source flows back to the reflux pipeline 5, and after being heated, it is passed into the heating pipeline 3 again, thereby forming a cycle.

[0029] The power source of the stirring shaft 22 is not limited. It is preferred that a driven gear 221 is coaxially fixed on the shaft body outside the recovery tank 2, and a drive motor 26 is installed outside the recovery tank 2, so that the motor shaft of the drive motor 26 is arranged parallel to the stirring shaft 22, and a driving gear 261 is coaxially fixed on the motor shaft of the drive motor 26, and the driving gear 261 is meshed with the driven gear 221, so that the stirring shaft 22 is driven to rotate when the drive motor 26 is working. When the stirring shaft 22 rotates, it drives the diverter pipe 24 to rotate synchronously.

[0030] After internal and external heating, dissolution in desalted water and stirring by the stirring rod 23, the urea particles become urea solution, which is recovered through the recovery pipeline 6 at the bottom of the recovery tank 2 and reused. A centrifugal pump is installed on the recovery pipeline 6 to adjust the recovery flow rate.

[0031] Solenoid valves are installed on the desalted water pipeline 4, the heating pipeline 3 and the return pipeline 5 to adjust the pipeline flow, and a temperature sensor and a liquid level sensor are installed in the recovery tank 2. The flow of the heat source is adjusted according to the temperature change, and the opening and closing of the centrifugal pump on the recovery pipeline 6 is controlled according to the liquid level in the recovery tank 2. The heat source is preferably steam condensate, and the recovered urea solution is returned to the urea tank of the production system for reuse.

[0032] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0033] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0034] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0035] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0036] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A urea particle recovery device, characterized in that: Urea particles scattered outside the lower windshield of the granulation tower (1) are passed into a recovery tank (2) through a collecting pipe (11), and the recovery tank (2) is also connected to a desalted water pipeline (4) for dissolving the urea particles; a stirring assembly is coaxially arranged inside the recovery tank (2), the outside of the recovery tank (2) and / or the stirring assembly are connected to a heat source to heat the urea particles, and an openable and closable recovery pipeline (6) is also arranged at the bottom of the recovery tank (2) to recover the urea solution.

2. A urea particle recovery device according to claim 1, characterized in that: The stirring assembly comprises a stirring shaft (22) arranged coaxially with the recovery tank (2), stirring rods (23) are evenly spaced along the length direction of the stirring shaft (22), and the stirring shaft (22) and each stirring rod (23) are arranged in a hollow shape; an outer coil (21) is arranged outside the recovery tank (2), and the outer coil (21) and the stirring shaft (22) are both connected to the return pipeline (5); the heat source is split after passing through the heating pipeline (3), and a part of the split flows through the outer coil (21) and enters the return pipeline (5), and another part of the split flows through the stirring rod (23) and the stirring shaft (22) in sequence and enters the return pipeline (5).

3. A urea particle recovery device according to claim 2, characterized in that: The end of the stirring rod (23) away from the stirring shaft (22) is a heat source inlet. A rotary joint (25) is coaxially arranged in the recovery tank (2). After the heat supply pipeline (3) is split, it is connected to the split pipe (24) through the rotary joint (25). The split pipe (24) is U-shaped. The split pipe (24) is provided with split ports corresponding to the number of the stirring rods (23). Each split port is correspondingly connected to the heat source inlet of each stirring rod (23).

4. A urea particle recovery device according to claim 2 or 3, characterized in that: One end of the stirring shaft (22) extends outside the recovery tank (2), and the stirring shaft (22) is coaxially fixed with a driven gear (221) on the shaft body of the recovery tank (2), and the recovery tank (2) is equipped with a drive motor (26), the motor shaft of the drive motor (26) is arranged in parallel with the stirring shaft (22), and a driving gear (261) meshing with the driven gear (221) is coaxially fixed on the motor shaft of the drive motor (26).

5. A urea particle recovery device according to any one of claims 1 to 3, characterized in that: Solenoid valves are installed on the desalted water pipeline (4), the heating pipeline (3) and the return pipeline (5) to adjust the pipeline flow, and a temperature sensor and a liquid level sensor are installed in the recovery tank (2).

6. A urea particle recovery device according to any one of claims 1 to 3, characterized in that: An inclined chute is provided at the bottom of the lower wind window of the granulation tower (1), and the pipe mouth of the collection pipe (11) is connected to the bottom of the inclined chute.

7. A urea particle recovery device according to any one of claims 1 to 3, characterized in that: The recovery pipeline (6) is provided with a centrifugal pump for conveying urea solution.

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