Rotary nozzle device for urea prilling tower

Abstract

The utility model discloses a rotating shower nozzle device for urea prilling tower relates to urea prilling technical field, including the nozzle shell, the side wall thickness of nozzle shell is even gradually thick from below to above, or adopts the gradually change structure of thick below thin, to reduce the particle collision and improve the granularity uniformity, the inner surface of nozzle shell is coated with polytetrafluoroethylene anti -sticky coating, and the outer wall is covered with the heat preservation material layer, and the thickness is 80 120mm, and the upper part of nozzle shell is inverted conical frustum body structure, and the lower part is positive conical body structure, and nozzle shell 1 top is equipped with the flange for connecting prilling tower top, and the first through -hole is distributed to the side wall of inverted conical frustum body structure along nozzle shell, and the diameter of first through -hole is gradually changed distribution from the bottom to the top of conical frustum body, and the range is 0.8 2.5mm, and the angle of first through -hole's axis and conical frustum body generatrix is even incremental from the bottom 60 to the top 120, to realize the non -interlaced distribution of spraying line, and dynamically regulate flow, and reduce the particle adhesion or breakage caused by local overload.

Description

Technical Field

[0001] This utility model relates to the field of urea granulation technology, specifically to a rotary nozzle device for urea granulation towers. Background Technology

[0002] The core equipment of the urea granulation tower is the rotary nozzle device, which atomizes the molten urea solution into tiny droplets through high-speed rotation, which then cool and solidify to form uniform particles. In existing technology, traditional nozzles have the following drawbacks: The nozzles are prone to clogging: molten urea easily crystallizes after cooling, leading to nozzle clogging and requiring frequent shutdowns for cleaning.

[0003] Uneven atomization: The single-stage atomization structure results in a wide droplet size distribution and poor particle uniformity.

[0004] Lubrication failure: Insufficient lubrication of bearings under high-speed rotation leads to accelerated wear and shortened lifespan.

[0005] Maintenance is complex: the nozzles are difficult to disassemble, and cleaning and replacing parts is time-consuming.

[0006] High energy consumption: The power of the drive motor is fixed and the speed cannot be adjusted according to the working conditions, resulting in energy waste. Therefore, it is necessary to design a rotary nozzle device for urea granulation tower. Utility Model Content

[0007] The purpose of this invention is to provide a rotary nozzle device for urea granulation towers to solve the problems mentioned in the background art.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a rotary nozzle device for a urea granulation tower, comprising a nozzle housing, the upper part of which is an inverted frustum structure and the lower part of which is a regular cone structure, a flange at the top of the nozzle housing for connecting to the top of the granulation tower, and a first through hole distributed along the side wall of the inverted frustum structure, the diameter of the first through hole being gradually distributed from the bottom to the top of the frustum, ranging from 0.8 to 2.5 mm;

[0009] A rotary drive device is coaxially connected to the nozzle housing and is used to drive the nozzle housing to rotate at a speed of 100-500 rpm.

[0010] The differential transverse distribution plate is set inside the nozzle housing to evenly distribute the molten urea liquid to the first through hole on the side wall.

[0011] A flow-blocking weir is fixed to the inner surface of the side wall of the nozzle housing and is used to adjust the flow rate of the molten liquid.

[0012] Safety relief valve, installed on the top of the nozzle housing, is used to automatically relieve pressure when the system is overpressured.

[0013] According to the above technical solution, the angle between the axis of the first through hole and the generatrix of the frustum increases uniformly from 60° at the bottom to 120° at the top, so as to achieve a non-intersecting distribution of spray lines.

[0014] According to the above technical solution, the thickness of the side wall of the nozzle housing gradually increases uniformly from bottom to top, or a gradient structure with thicker top and thinner bottom is adopted to reduce particle collision and improve particle size uniformity.

[0015] According to the above technical solution, the differential transverse distribution disc has the characteristic of equal weight density spraying, which ensures that the molten liquid forms uniform droplets under the action of centrifugal force.

[0016] According to the above technical solution, the inner surface of the nozzle housing is coated with a polytetrafluoroethylene anti-stick coating, and the outer wall is covered with a thermal insulation material layer with a thickness of 80-120 mm.

[0017] According to the above technical solution, it also includes an air cooling system, with the nozzle device set at the top of the tower body at a height of 50-70 m, and a conical constriction and vibrating screening device at the bottom of the tower body for collecting and screening particles.

[0018] According to the above technical solution, the distribution density of the first through hole is 5,000-12,000 per square meter, and the diameter of the spray hole is positively correlated with the target particle size of urea particles.

[0019] According to the above technical solution, the differential transverse distribution plate includes a first guide pipe, which is arranged along the vertical line of the longitudinal center of the nozzle housing. Several second guide pipes are arranged sequentially along the liquid flow direction of the first guide pipe. The several second guide pipes are arranged symmetrically with respect to the first guide pipe. Each second guide pipe is connected to a first through hole to ensure that the molten liquid flows out through the first through hole.

[0020] The differential horizontal distribution plate also includes a receiving groove, which is arc-shaped and has a low point in the middle that is connected to the first drainage pipe for receiving molten liquid.

[0021] According to the above technical solution, the flow-blocking weir includes a support rod for clamping and supporting the second drain pipe. The flow-blocking weir also includes a first micro valve disposed inside the second drain pipe. The first micro valve controls the flow rate of the liquid medium inside the second drain pipe to optimize the flow path of the molten liquid.

[0022] According to the above technical solution, the safety overflow valve includes a third drain pipe, which is inclined and horizontally placed inside the nozzle housing. A second micro valve is provided at the connection between the third drain pipe and the first drain pipe. The second micro valve is used to control the flow path of the molten liquid. The third drain pipe is connected to a fourth drain pipe, which is connected to a fifth drain pipe provided inside the nozzle housing. The fifth drain pipe is arranged parallel to the first drain pipe and the two are not in direct contact. A third micro valve is provided at the end of the fifth drain pipe. The third micro valve is connected to a sixth drain pipe, which is connected to a second through hole. The second through hole is provided on the side wall of the orthogonal conical structure.

[0023] Compared with the prior art, the beneficial effects achieved by this utility model are: by providing a second drainage tube, which corresponds one-to-one with the first through hole, a single blockage can be replaced independently.

[0024] With the fifth drain pipe installed, when the system pressure exceeds the limit, the second micro valve of the safety overflow valve controlled by the remote system opens, and the molten liquid is diverted to the fifth drain pipe through the third and fourth drain pipes. At this time, the system controls the third micro valve to control the overflow liquid to be discharged from the second through hole through the sixth drain pipe, so as to avoid excessive pressure inside the nozzle housing. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0026] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the planar structure of the nozzle housing of this utility model;

[0028] Figure 3 This is the utility model Figure 1 Enlarged structural diagram of region A in the middle;

[0029] In the diagram: 1. Nozzle housing; 2. Flange; 3. First through hole; 4. Rotary drive device; 5. Differential transverse distribution plate; 6. Flow-blocking weir; 7. Safety overflow valve; 8. First drain pipe; 9. Second drain pipe; 10. Receiving groove; 11. Support rod; 12. First micro valve; 13. Third drain pipe; 14. Second micro valve; 15. Fourth drain pipe; 16. Fifth drain pipe; 17. Third micro valve; 18. Sixth drain pipe; 19. Second through hole. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Please see Figure 1-3 This utility model provides a technical solution: a rotary nozzle device for a urea granulation tower, comprising a nozzle housing 1. The sidewall thickness of the nozzle housing 1 gradually increases uniformly from bottom to top, or adopts a gradient structure with a thicker top and thinner bottom to reduce particle collision and improve particle size uniformity. The inner surface of the nozzle housing 1 is coated with a polytetrafluoroethylene anti-stick coating, and the outer wall is covered with a thermal insulation material layer with a thickness of 80-120 mm. The upper part of the nozzle housing 1 has an inverted frustum structure, and the lower part has a regular cone structure. A flange 2 is provided at the top of the nozzle housing 1 for connecting to the top of the granulation tower. The flange has high strength. The nozzle housing generates a large amplitude of vibration during rotation, requiring the flange to limit its position. The nozzle housing 1 has first through holes 3 distributed along the sidewall of the inverted frustum structure. The diameter of the first through holes 3 varies from the bottom to the top of the frustum, ranging from 0.8 to 2.5 mm. mm, the angle between the axis of the first through hole 3 and the generatrix of the frustum increases uniformly from 60° at the bottom to 120° at the top, so as to achieve a non-intersecting distribution of the spray lines. The distribution density of the first through hole 3 is 5000-12000 per square meter, and the diameter of the spray hole is positively correlated with the target particle size of urea particles.

[0032] The rotary drive device 4 is coaxially connected to the nozzle housing 1 and is used to drive the nozzle housing 1 to rotate at a speed of 100-500 rpm. The system remotely controls the operation of the rotary drive device 4, which in turn drives the nozzle housing 1 to rotate as a whole, so as to achieve the effect of uniform spraying of molten liquid. The spraying range of molten liquid can also be controlled by controlling the rotation speed of the rotary drive device 4. Through the synergistic effect of equal weight density separation and centrifugal force, the droplet size is consistent and the standard deviation of urea particle size is small.

[0033] The differential transverse distribution plate 5 is disposed inside the nozzle housing 1 and is used to evenly distribute the urea melt to the first through hole 3 on the side wall. The differential transverse distribution plate 5 has the characteristic of equal weight density spraying, ensuring that the melt forms uniform droplets under the action of centrifugal force. The differential transverse distribution plate 5 includes a first guide pipe 8, which is arranged along the vertical line of the longitudinal center of the nozzle housing 1. Several second guide pipes 9 are arranged sequentially along the liquid flow direction of the first guide pipe 8. The several second guide pipes 9 are symmetrically arranged with respect to the first guide pipe 8. Each second guide pipe 9 is connected to a first through hole 3 to ensure that the melt flows out through the first through hole 3. The differential transverse distribution plate 5 also includes a receiving groove 10, which is arc-shaped and the middle recessed low point of the receiving groove 10 is connected to the first guide pipe 8 for receiving the melt. The second guide pipes 9 correspond one-to-one with the first through hole 3, and a single blockage can be replaced independently.

[0034] The flow-restricting weir 6 is fixed to the inner surface of the side wall of the nozzle housing 1 and is used to adjust the flow rate of the molten liquid. The flow-restricting weir 6 includes a support rod 11, which is used to clamp and support the second drain pipe 9. The flow-restricting weir 6 also includes a first micro valve 12 disposed in the second drain pipe 9. The first micro valve 12 controls the flow rate of the liquid medium in the second drain pipe 9 and is used to optimize the flow path of the molten liquid. The flow-restricting weir 6 fixes the second drain pipe 9 through the support rod 11. The first micro valve 12 inside it dynamically adjusts the flow rate of each second drain pipe 9 to avoid local overload and reduce particle adhesion or breakage caused by local overload.

[0035] A safety relief valve 7 is installed on the top of the nozzle housing 1 to automatically release pressure when the system is overpressured. The safety relief valve 7 includes a third drain pipe 13, which is inclined and horizontally placed inside the nozzle housing 1. A second micro valve 14 is provided at the connection between the third drain pipe 13 and the first drain pipe 8. The second micro valve 14 is used to control the flow path of the molten liquid. The third drain pipe 13 is connected to a fourth drain pipe 15, which is connected to a fifth drain pipe 16 located inside the nozzle housing 1. The fifth drain pipe 16 is arranged parallel to the first drain pipe 8 and there is no direct contact between them. The end of the fifth drain pipe 16 is provided with... A third micro valve 17 is installed, which is connected to a sixth drain pipe 18. The sixth drain pipe 18 is connected to a second through hole 19, which is located on the side wall of the orthogonal cone structure. When the system pressure exceeds the limit, the remote system controls the second micro valve 14 of the safety overflow valve 7 to open. The molten liquid is diverted to the fifth drain pipe 16 through the third drain pipe 13 and the fourth drain pipe 15. At this time, the system controls the third micro valve 17 to control the overflow liquid to be discharged from the second through hole 19 through the sixth drain pipe 18, so as to avoid excessive pressure inside the nozzle housing 1 and to quickly relieve pressure through the independent overflow channel (fifth drain pipe 16).

[0036] When the system does not detect excessive pressure, the molten liquid enters the second drain pipe 9 through the first drain pipe 8 and is finally discharged through the first through hole 3;

[0037] It also includes an air cooling system, with the nozzle device located at the top of the tower at a height of 50-70 m. The bottom of the tower is equipped with a conical constriction and a vibrating screening device for collecting and screening particles, which works in conjunction with the rotating nozzle.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A rotary nozzle device for a urea granulation tower, characterized in that, include: The nozzle housing (1) has an upper part in the shape of an inverted frustum and a lower part in the shape of a cone. The nozzle housing (1) is provided with a flange (2) at the top for connecting to the top of the granulation tower. The flange has high stability. The nozzle housing vibrates a lot during rotation, so the flange is needed to limit its position. The nozzle housing (1) has a first through hole (3) distributed along the side wall of the inverted frustum structure. The diameter of the first through hole (3) varies from the bottom to the top of the frustum, ranging from 0.8 to 2.5 mm. A rotary drive device (4) is coaxially connected to the nozzle housing (1) and is used to drive the nozzle housing (1) to rotate at a speed of 100-500 rpm. Differential transverse distribution plate (5), the differential transverse distribution plate (5) is disposed inside the nozzle housing (1) and is used to uniformly distribute urea melt to the first through hole (3) on the side wall. A flow-blocking weir (6) is fixed to the inner surface of the side wall of the nozzle housing (1) and is used to adjust the flow rate of the molten liquid. Safety relief valve (7), which is installed on the top of the nozzle housing (1), is used to automatically relieve pressure when the system is overpressured.

2. The rotary nozzle device for urea granulation tower according to claim 1, characterized in that, The angle between the axis of the first through hole (3) and the generatrix of the truncated cone increases uniformly from 60° at the bottom to 120° at the top, so as to achieve a non-intersecting distribution of spray lines.

3. The rotary nozzle device for urea granulation tower according to claim 1, characterized in that, The thickness of the sidewall of the nozzle housing (1) gradually increases uniformly from bottom to top, or a gradient structure with thicker top and thinner bottom is adopted to reduce particle collision and improve particle size uniformity.

4. The rotary nozzle device for urea granulation tower according to claim 1, characterized in that, The differential transverse distribution plate (5) has the characteristic of equal weight density spraying, which ensures that the melt forms uniform droplets under the action of centrifugal force.

5. The rotary nozzle device for urea granulation tower according to claim 1, characterized in that, The inner surface of the nozzle housing (1) is coated with a polytetrafluoroethylene anti-stick coating, and the outer wall is covered with a thermal insulation material layer with a thickness of 80-120 mm.

6. The rotary nozzle device for urea granulation tower according to claim 1, characterized in that, It also includes an air cooling system. The nozzle device is located at the top of the tower body, which is 50-70 m high. The bottom of the tower body is equipped with a conical constriction and a vibrating screening device for collecting and screening particles.

7. The rotary nozzle device for urea granulation tower according to claim 1, characterized in that, The distribution density of the first through hole (3) is 5,000-12,000 per square meter, and the diameter of the spray hole is positively correlated with the target particle size of urea particles.

8. The rotary nozzle device for urea granulation tower according to claim 4, characterized in that, The differential transverse distribution plate (5) includes a first drainage pipe (8), which is arranged along the vertical line of the longitudinal center of the nozzle housing (1). Several second drainage pipes (9) are arranged sequentially along the liquid flow direction of the first drainage pipe (8). The several second drainage pipes (9) are arranged symmetrically with respect to the first drainage pipe (8). Each second drainage pipe (9) is connected to a first through hole (3) to ensure that the molten liquid flows out through the first through hole (3). The differential horizontal distribution plate (5) also includes a receiving groove (10), which is arc-shaped and has a low point in the middle that is connected to the first drain pipe (8) for receiving molten liquid.

9. The rotary nozzle device for a urea granulation tower according to claim 8, characterized in that, The flow-blocking weir (6) includes a support rod (11) for clamping and supporting the second drain pipe (9). The flow-blocking weir (6) also includes a support rod (11) and a first micro valve (12) disposed in the second drain pipe (9). The first micro valve (12) controls the flow rate of the liquid medium in the second drain pipe (9) to optimize the flow path of the molten liquid.

10. The rotary nozzle device for a urea granulation tower according to claim 9, characterized in that, The safety overflow valve (7) includes a third drain pipe (13), which is inclined and horizontally placed inside the nozzle housing (1). A second micro valve (14) is provided at the connection between the third drain pipe (13) and the first drain pipe (8). The second micro valve (14) is used to control the flow path of the molten liquid. The third drain pipe (13) is connected to a fourth drain pipe (15). The fourth drain pipe (15) is connected to a fifth drain pipe (16) provided inside the nozzle housing (1). The fifth drain pipe (16) is arranged parallel to the first drain pipe (8) and the two are not in direct contact. A third micro valve (17) is provided at the end of the fifth drain pipe (16). The third micro valve (17) is connected to a sixth drain pipe (18). The sixth drain pipe (18) is connected to a second through hole (19). The second through hole (19) is provided on the side wall of the orthogonal conical structure.

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