Ammonium nitrate granulation tower

Abstract

The utility model discloses an ammonium nitrate prilling tower and belongs to the technical field of ammonium nitrate production. The round conveying pipe is used as a conveying pipeline of ammonium nitrate solution, and the square conveying pipe is used for conveying hot air blown by the air blower. A frustum-shaped steel structure platform frame is adopted to replace a traditional steel-concrete structure, higher structural stability is brought, a heating pipe in the electric heater enlarges the heat dissipation area, a first nozzle on a circular conveying pipe is of a conical structure, a plurality of second nozzles with different heights are arranged on a square conveying pipe, exhaust outlets are formed in the second nozzles, and therefore the heat dissipation efficiency of the electric heater is improved. Ammonium nitrate solution drops can be in full contact with hot air flow during falling, so that the heat of the air is effectively utilized, and the production efficiency of ammonium nitrate granulation is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of ammonium nitrate production, and particularly relates to an ammonium nitrate granulation tower. Background Art

[0002] Ammonium nitrate, abbreviated as AN, has a wide range of uses in industrial and agricultural production. The ammonium nitrate granulation tower can cool ammonium nitrate solution to produce granular solid products with a diameter of 1.0 - 2.5 mm. The ammonium nitrate granulation tower of the traditional process is supported by a steel-concrete structure. The height of the nitric acid granulation tower exceeds 64 meters. Therefore, the investment in the steel-concrete structure is large, which greatly increases the equipment investment. The air entering the granulation tower is heated by hot air, and the pipeline setting in the granulation tower does not fully consider the gas-liquid contact problem, which affects the production efficiency of ammonium nitrate granulation. Therefore, to meet the actual production needs of small-output ammonium nitrate abroad, there is an urgent need for a new type of ammonium nitrate granulation tower that can effectively reduce production costs, save resources, and ensure safe production. Summary of the Utility Model

[0003] The purpose of the utility model is to provide an ammonium nitrate granulation tower, which can improve the problem of high production cost of the existing ammonium nitrate granulation tower, and enhance the absorption and utilization rate of heat energy by improving the heating method and the setting of the internal pipeline and nozzle of the granulation tower, so as to improve the granulation efficiency of ammonium nitrate.

[0004] To achieve the above purpose, the technical scheme adopted by the utility model is as follows: an ammonium nitrate granulation tower, the ammonium nitrate granulation tower includes a granulation tower body, a circular conveying pipe and a square conveying pipe are arranged inside the granulation tower body, the circular conveying pipe is fixedly connected with a granulation feed pump through a pipeline, the square conveying pipe is fixedly connected with a blower through a pipeline, and the blower is fixedly connected with an electric heater through a pipeline.

[0005] When the utility model is in use, the ammonium nitrate solution is first transported to the circular conveying pipe by the granulation feed pump through the pipeline. The high-concentration molten ammonium nitrate solution is sprayed into a thin stream by the first nozzle on the circular conveying pipe and freely falls in the state of single droplets. The outside air is heated by the electric heater, and then the heated air is transported to the square conveying pipe by the granulation blower through the pipeline. The hot air is ejected by the second nozzle on the square conveying pipe. Since the density of the hot air is less than that of the cold air, the hot air flow will rise after being ejected, so as to mix with the ammonium nitrate solution in the state of droplets in a countercurrent manner to complete granulation.

[0006] The circular conveying pipe is a pipe with a circular cross-section, which has excellent toughness and ductility. The circular cross-section shape makes it have good bearing capacity and corrosion resistance, and it is easier to be used as the conveying pipeline of ammonium nitrate solution. The square conveying pipe is a pipe with a rectangular cross-section. The rectangular cross-section shape makes it have good rigidity. When the blower blows the hot air flow into the pipeline, the square conveying pipe can withstand greater pressure and torque.

[0007] As an optimization, the granulation tower body is a frustum-shaped framework.

[0008] When this optimization solution is in use, a frustum-shaped steel structure platform framework is adopted to replace the traditional steel-concrete structure. On the one hand, it avoids the defect of large investment in steel-concrete structure buildings and reduces production costs. On the other hand, the frustum-shaped granulation tower body structure has stronger stability, more excellent stress performance and seismic performance, ensuring safe production.

[0009] As an optimization, the electric heater is internally provided with heating tubes, and the heating tubes are composed of several U-shaped tubes arranged in a "W" shape.

[0010] When this optimization solution is in use, a more environmentally friendly electric heating method is adopted to replace the traditional hot air heating. And the electric heater is internally provided with U-shaped heating tubes arranged in a "W" shape, which can expand the heat dissipation area of the electric heating tubes, facilitate rapid and instant heating. At the same time, the "W" shape structure setting of the heating tubes also makes the air heating more uniform and enhances the heat transfer efficiency.

[0011] As an optimization, a number of conical first nozzles are threadedly installed on the circular conveying pipe, and a number of second nozzles are threadedly installed on the square conveying pipe.

[0012] When this optimization solution is in use, a number of the first nozzles on the circular conveying pipe are conical structures. When the ammonium nitrate solution is sprayed out through the conical first nozzles, an annular spray area will be formed, so that the contact area with the hot air flow can be increased in a short time. At the same time, a number of second nozzles with different heights are arranged on the square conveying pipe, so that an appropriate amount of hot air is blown out at different height positions, facilitating the full contact of the ammonium nitrate solution droplets with the hot air flow when falling.

[0013] And both the first nozzles and the second nozzles are threadedly connected to the conveying pipes, which is convenient for disassembly and easy to replace when the nozzles are damaged during daily use.

[0014] As an optimization, the second nozzle is provided with an air outlet.

[0015] When this optimization solution is in use, the hot air flow is discharged through the air outlet on the second nozzle. The design of the air outlet can control the discharge flow rate of the hot air to a certain extent, so that the heat of the air is effectively utilized, ensuring the production efficiency of ammonium nitrate granulation.

[0016] As an optimization, an internal ladder is provided inside the granulation tower body.

[0017] When this optimization solution is in use, through the provided internal ladder, it is convenient for technicians to carry out maintenance and daily safety inspections.

[0018] By adopting the above technical solution, the beneficial effects of the utility model are:

[0019] 1. Use a round delivery pipe as the delivery pipe for ammonium nitrate solution. The round cross-sectional shape gives it good load-bearing capacity and corrosion resistance, making it easier to use as a delivery pipe for ammonium nitrate solution. The square delivery pipe can withstand greater pressure and torque and is easier to deliver the hot air blown in by the blower.

[0020] 2. The utility model adopts a frustum-shaped steel structure platform frame to replace the traditional steel-concrete structure. On the one hand, it avoids the defect of large investment in the steel-concrete structure and reduces production costs. On the other hand, the frustum-shaped granulation tower body structure is more stable and has more superior stress-bearing performance and earthquake-resistant performance, ensuring safe production.

[0021] 3. The utility model adopts a more environmentally friendly electric heating method to replace the traditional hot air heating, and the electric heater is provided with a U-shaped heating tube arranged in a "W" shape, which can expand the heat dissipation area of the electric heating tube and facilitate rapid and instant heating. At the same time, the "W"-shaped structure of the heating tube also makes the air heating more uniform and enhances the heat transfer efficiency.

[0022] 4. The first nozzle is a conical structure, so that the sprayed ammonium nitrate solution forms an annular spray area, thereby increasing the contact area with the hot air flow in a short time. A number of second nozzles at different heights are arranged on the square conveying pipe. The second nozzle is provided with an exhaust port, which can control the exhaust flow rate of the hot air to a certain extent, so that an appropriate amount of hot air can be blown out at different heights, which is convenient for the ammonium nitrate solution droplets to fully contact with the hot air flow when falling, so that the heat of the air is effectively utilized, and the production efficiency of the ammonium nitrate granulation is guaranteed.

[0023] 5. Both the first and second nozzles are connected to the delivery pipe by threads, which is easy to disassemble and can be easily replaced when the nozzle is damaged during daily use. A built-in ladder is set inside the granulation tower body to facilitate technicians to carry out maintenance and daily safety inspections. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the utility model.

[0025] Figure 2 It is a schematic diagram of a ladder built into the granulation tower body of the utility model.

[0026] Figure 3 It is a diagram showing the arrangement of a circular conveying pipe and a square conveying pipe in a granulating tower body of the utility model.

[0027] Figure 4 It is a schematic diagram of a square conveying pipe of the utility model.

[0028] Figure 5This is a schematic diagram of the second nozzle of the present utility model.

[0029] In the figure: 1, granulation feed pump; 2, granulation tower body; 3, electric heater; 4, heating pipe; 5, blower; 6, built-in ladder; 7, circular conveying pipe; 8, first nozzle; 9, square conveying pipe; 10, second nozzle; 11, air outlet. Specific embodiments

[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0031] As Figures 1 - 5 Shown, the present utility model: a ammonium nitrate granulation tower, the ammonium nitrate granulation tower includes a granulation tower body 2, a circular conveying pipe 7 and a square conveying pipe 9 are arranged inside the granulation tower body 2, the circular conveying pipe 7 is fixedly connected to a granulation feed pump 1 through a pipeline, the square conveying pipe 9 is fixedly connected to a blower 5 through a pipeline, and the blower 5 and the electric heater 4 are fixedly connected through a pipeline.

[0032] The circular conveying pipe 7 is a pipe with a circular cross-section, having excellent toughness and ductility. The circular cross-sectional shape gives it good load-bearing capacity and corrosion resistance, and it is more suitable as a conveying pipeline for ammonium nitrate solution. The square conveying pipe 9 is a pipe with a rectangular cross-section, and the rectangular cross-sectional shape gives it good rigidity. When the blower 5 blows hot air flow into the pipeline, the square conveying pipe 9 can withstand greater pressure and torque.

[0033] The granulation tower body 2 is a frustum-shaped frame, which makes the structure of the granulation tower body more stable, has more excellent stress performance and seismic performance, and ensures safe production. The electric heater 3 is internally provided with a heating pipe 4, and the heating pipe 4 is composed of a number of U-shaped pipes, arranged in a "W" shape, which can expand the heat dissipation area of the electric heating pipe, facilitate rapid and timely heating, and at the same time, the "W" shape structure setting of the heating pipe also makes the air heating more uniform and enhances the heat transfer efficiency.

[0034] A number of conical first nozzles 8 are threadedly installed on the circular conveying pipe 7, and a number of second nozzles 10 are threadedly installed on the square conveying pipe 9. The second nozzle 10 is provided with an air outlet 11.

[0035] A number of first nozzles 8 on the circular conveying pipe 7 are of a conical structure. When the ammonium nitrate solution is ejected from the conical first nozzles 8, an annular spray area will be formed, so that the contact area with the hot air flow can be increased in a short time. At the same time, a number of second nozzles 10 with different heights are arranged on the square conveying pipe 9. An air discharge port 11 is provided on the second nozzles 10. The design of the air discharge port 11 can control the discharge flow of the hot air to a certain extent, so that an appropriate amount of hot air is blown out at different height positions, which is convenient for the ammonium nitrate solution droplets to fully contact the hot air flow when falling, making the heat of the air effectively utilized and ensuring the production efficiency of ammonium nitrate granulation. And both the first nozzles 8 and the second nozzles 10 are connected to the conveying pipe by threads, which is convenient for disassembly. When the nozzles are damaged during daily use, they can be easily replaced.

[0036] An internal ladder 6 is provided inside the granulation tower body 2, which is convenient for technicians to carry out maintenance and daily safety inspections.

[0037] Working principle: When the present utility model is in use, the ammonium nitrate solution is first transported by a granulation feed pump through a pipeline to the circular conveying pipe. The high-concentration molten ammonium nitrate solution is sprayed into a thin stream with an annular spray area by the conical first nozzles on the circular conveying pipe and then falls freely in a single droplet state. The outside air is heated by the heating pipes in the electric heater, and then the heated air is transported by the granulation blower through a pipeline to the square conveying pipe. The air discharge ports provided on the second nozzles at different height positions on the square conveying pipe can control the flow of the hot air to a certain extent, so that an appropriate amount of hot air is discharged from the second nozzles at different height positions. Since the density of the hot air is less than that of the cold air, the hot air flow will rise after being ejected, so as to mix with the ammonium nitrate solution in a droplet state in a countercurrent manner to complete granulation.

[0038] Of course, the above description is not limited to the above examples. The technical features not described in the present utility model can be realized by or adopted the prior art, and will not be elaborated here; the above embodiments and the drawings are only used to illustrate the technical solutions of the present utility model and are not a limitation to the present utility model. The present utility model has been described in detail with reference to the preferred embodiments. Those of ordinary skill in the art should understand that any changes, modifications, additions or substitutions made by those of ordinary skill in the art within the scope of the essence of the present utility model do not depart from the purpose of the present utility model and should also fall within the scope of the claims of the present utility model.

Claims

1. An ammonium nitrate granulation tower, characterized in that, The ammonium nitrate granulation tower includes a granulation tower body (2). Inside the granulation tower body (2), there are a circular conveying pipe (7) and a square conveying pipe (9). The circular conveying pipe (7) is fixedly connected to a granulation feed pump (1) through a pipeline. The square conveying pipe (9) is fixedly connected to a blower (5) through a pipeline. The blower (5) is fixedly connected to an electric heater (3) through a pipeline.

2. The ammonium nitrate granulation tower according to claim 1, characterized in that, The granulation tower body (2) is a frustum-shaped framework.

3. The ammonium nitrate granulation tower according to claim 1, characterized in that, Inside the electric heater (3), there is a heating pipe (4). The heating pipe (4) is composed of a number of U-shaped pipes and is arranged in a "W" shape.

4. The ammonium nitrate granulation tower according to claim 1, characterized in that, A number of conical first nozzles (8) are threadedly installed on the circular conveying pipe (7), and a number of second nozzles (10) are threadedly installed on the square conveying pipe (9).

5. The ammonium nitrate granulation tower according to claim 4, characterized in that, An air outlet (11) is provided on the second nozzle (10).

6. The ammonium nitrate granulation tower according to claim 1, wherein, An internal ladder (6) is provided inside the granulation tower body (2).

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