Double-effect concentration system for liquid ammonium nitrate

Abstract

The utility model relates to a double-effect concentration system for liquid ammonium nitrate, which comprises a first-effect flash tank and a second-effect flash tank which are connected in sequence, a gas outlet of the first-effect flash tank is connected with a gas inlet of the second-effect flash tank, and liquid inlets of the first-effect flash tank and the second-effect flash tank are both provided with rotary nozzles. The spraying device is used for uniformly spraying an entered ammonium nitrate solution upwards; and air inlets of the first-effect flash tank and the second-effect flash tank are arranged below the liquid inlet. The rotary nozzles are arranged at the liquid inlets of the first-effect flash tank and the second-effect flash tank, and the openings of the nozzles are fan-shaped, so that an ammonium nitrate solution can be uniformly sprayed upwards, the liquid coverage area and the gas-liquid contact area are increased, the heat transfer effect is enhanced, and the evaporation efficiency is improved; the application of the rotary nozzle enables the liquid to be uniformly distributed, so that the liquid is prevented from being accumulated on the tank wall, the risk of scaling is reduced, the cleaning and maintenance cost of the equipment is reduced, and the service life of the equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of ammonium nitrate production equipment, in particular to a liquid ammonium nitrate double-effect concentration system. Background Art

[0002] In traditional processes, the concentration of ammonium nitrate usually adopts a single-effect evaporation method, but this method consumes a lot of steam and has low energy utilization efficiency, resulting in high production costs. In addition, the heating efficiency and evaporation efficiency of the flash tank in the existing technology are often limited by factors such as the gas-liquid contact area, the liquid flow path, and the heat transfer efficiency. The design of the traditional flash tank adopts a fixed liquid inlet and a straight-through air intake method. The liquid is injected from the top or side and flows down along the tank wall, while the heating steam introduced from the bottom rises and contacts the liquid for heat transfer. Due to the uneven flow of the liquid in the tank, insufficient gas-liquid contact or stagnation occurs in some areas, resulting in low heating efficiency and unsatisfactory evaporation effect. In addition, the liquid spraying and airflow distribution are uneven, which easily leads to local overheating and scaling problems, further affecting the working efficiency and service life of the flash tank. Therefore, in order to improve the flash evaporation efficiency, it is particularly important to optimize the internal structure of the flash tank. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the utility model provides a liquid ammonium nitrate double-effect concentration system, which solves the problems of high energy consumption and low efficiency in the existing technology by optimizing the internal structure of the flash tank, improving the gas-liquid contact area and heat transfer efficiency.

[0004] The utility model is realized by the following technical scheme, which is a liquid ammonium nitrate double-effect concentration system, characterized in that: it comprises a first-effect flash tank and a second-effect flash tank connected in sequence, the air outlet of the first-effect flash tank is connected to the air inlet of the second-effect flash tank, and the liquid outlet of the first-effect flash tank is connected to the liquid inlet of the second-effect flash tank; the liquid inlets of the first-effect flash tank and the second-effect flash tank are both provided with a rotating nozzle for uniformly spraying the incoming ammonium nitrate solution upward; the air inlets of the first-effect flash tank and the second-effect flash tank are arranged below the liquid inlet.

[0005] When in use, the utility model utilizes the secondary steam of the first-effect flash tank to heat the second-effect flash tank, thereby making full use of thermal energy, reducing steam consumption, and achieving energy conservation and consumption reduction. A rotating nozzle is provided to spray the liquid evenly, thereby increasing the gas-liquid contact area. In addition, the movement of the rotating nozzle can generate turbulence, which helps to avoid the accumulation of liquid on the tank wall, reduces the risk of scaling, reduces cleaning and maintenance costs, and extends the service life of the equipment.

[0006] As an optimization, the rotary spray head includes at least one nozzle, and the opening of the nozzle is arranged in a fan shape.

[0007] By adopting the above technical solution, the opening of the nozzle is set to be fan-shaped, which increases the coverage area of the liquid, improves the gas-liquid contact efficiency, avoids the concentrated spraying or local liquid accumulation that may occur when traditional nozzles spray, ensures that the liquid forms a uniform liquid film inside the equipment, and improves the heat transfer effect.

[0008] As an optimization, a plurality of square guide plates are fixedly installed on the inner walls of the first-effect flash tank and the second-effect flash tank. The plurality of guide plates are alternately arranged to tilt downward, and the tilt angle is 30°-45°.

[0009] By adopting the above technical solution, the guide plates are set at an inclined angle and installed in a staggered manner, so that the gas in the tank has a spiral upward flow pattern, forcing the gas to continuously change its flow direction, forming turbulence, and improving the gas-liquid contact efficiency. The inclined guide plates can allow the gas to continue to mix with the liquid during the rising process, and prolong the contact time between the two, thereby increasing the heat transfer efficiency.

[0010] As an optimization, guide holes are provided on the guide plate.

[0011] By adopting the above technical solution, the guide holes on the guide plate help reduce the steam flow resistance and enhance the gas-liquid mixing effect.

[0012] As an optimization, the guide holes on the guide plate are circular holes with a diameter of 5-20 mm, which are evenly distributed on the guide plate.

[0013] As an optimization, the air outlet of the first-effect flash tank and the air inlet of the second-effect flash tank are connected through a heat pump.

[0014] By adopting the above technical solution, the heat pump compresses and condenses the secondary steam, raising its temperature and pressure so that it reaches usable heating conditions again.

[0015] As an optimization, the double-effect evaporation system for ammonium nitrate solution concentration further includes a preheater, and the air outlet of the second-effect flash tank is connected to the air inlet of the preheater.

[0016] By adopting the above technical solution, the secondary steam of the second-effect flash tank is used to preheat the material entering the system, thereby increasing the initial temperature of the material and reducing the total energy consumption of the system.

[0017] As an optimization, the gas outlet of the second-effect flash tank and the gas inlet of the preheater are connected through a heat pump.

[0018] As an optimization, the double-effect evaporation system for ammonium nitrate solution concentration further includes a heating tank for supplying heat to the first-effect flash tank, and the air outlet of the preheater is connected to the air inlet of the heating tank.

[0019] By adopting the above technical solution, the secondary steam generated by the second-effect flash tank is used to preheat the material in the preheater. The steam generated during the preheating process then enters the heating tank to provide heat energy for the first-effect flash tank, so that the steam in the entire system is circulated between different equipment, effectively reducing the emission and waste of steam, realizing the multi-stage recycling of steam, further improving the thermal energy utilization rate of the system, and achieving the purpose of energy saving and consumption reduction.

[0020] The beneficial effects of the utility model are:

[0021] 1. By installing rotating nozzles at the liquid inlets of the first-effect and second-effect flash tanks, and the nozzle openings are designed in a fan shape, the ammonium nitrate solution can be sprayed upward evenly, increasing the liquid coverage area and the gas-liquid contact area, enhancing the heat transfer effect, and improving the evaporation efficiency; the application of rotating nozzles enables the liquid to be evenly distributed, avoiding liquid accumulation on the tank wall, reducing the risk of scaling, reducing the cleaning and maintenance costs of the equipment, and extending the service life of the equipment.

[0022] 2. Square guide plates with an angle of 30-45 degrees are fixed to the inner wall of the flash tank, and are alternately arranged with circular holes with a diameter of 5-20 mm. The design of the guide plates causes the gas to flow in a spiral upward pattern within the tank, forming turbulence, enhancing gas-liquid mixing, extending the contact time between the two, and further improving heat transfer efficiency.

[0023] 3. The secondary steam from the first-effect flash tank is used to heat the second-effect flash tank through a heat pump to increase the temperature and pressure of the secondary steam, making full use of the thermal energy. The secondary steam from the second-effect flash tank is used to preheat the material, and the steam generated during the preheating process is used to heat the first-effect flash tank, forming a multi-stage recycling process, which significantly reduces steam consumption and achieves the purpose of energy saving and consumption reduction. By setting up a heat pump and a preheater, the steam utilization method is optimized, the overall thermal energy utilization rate of the system is improved, the production efficiency is improved, and the production cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall process of the utility model;

[0025] Figure 2 It is a structural diagram of the first-effect flash tank and the second-effect flash tank.

[0026] As shown in the figure:

[0027] 1. Heating tank, 2. Preheater, 3. First-effect flash tank, 4. Second-effect flash tank, 5. Rotating nozzle, 6. Guide plate. DETAILED DESCRIPTION

[0028] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0029] Refer to the attached Figure 1-2 This application is described in further detail.

[0030] The present application discloses a liquid ammonium nitrate double-effect concentration system.

[0031] Reference Figure 1 A liquid ammonium nitrate double-effect concentration system includes a heating tank 1, a preheater 2, a first-effect flash tank 3, and a second-effect flash tank 4. The ammonium nitrate solution enters the liquid inlet of the preheater 2 through a pipeline, flows out from the liquid outlet after preheating, and enters the first-effect flash tank 3. The liquid outlet of the first-effect flash tank 3 is connected to the liquid inlet of the second-effect flash tank 4. The gas outlet of the first-effect flash tank 3 is connected to the gas inlet of the second-effect flash tank 4 via a heat pump. The gas outlet of the second-effect flash tank 4 is also connected to the gas inlet of the preheater 2 via a heat pump. The secondary steam of the second-effect flash tank 4 is used to preheat the ammonium nitrate solution entering the system. The gas outlet of the preheater 2 is connected to the gas inlet of the heating tank 1. The steam generated during the preheating process enters the heating tank 1, providing heating steam for the first-effect flash tank 3.

[0032] Reference Figure 2 The first-effect flash tank 3 and the second-effect flash tank 4 of the present application have the same structure. The liquid inlet of each flash tank is equipped with a rotary nozzle 5 with a fan-shaped opening nozzle, which is used to spray the incoming ammonium nitrate solution evenly upward. The rotary nozzle 5 includes at least one nozzle, and two are shown in this embodiment; the air inlet is arranged below the liquid inlet, and the heating steam enters from the bottom and contacts the liquid in the opposite direction. A plurality of square guide plates 6 with an inclination angle of 30° and alternating downward are fixedly installed on the inner wall of the flash tank. Circular holes with a diameter of 10 mm are evenly distributed on the guide plates 6, which guide the steam to rise in a spiral manner, enhance gas-liquid mixing, and improve heat transfer efficiency. Through the above-mentioned sequential connection and structural optimization, efficient recycling of materials and steam is achieved, the thermal energy utilization rate of the system is significantly improved, and the purpose of energy saving and consumption reduction is achieved.

[0033] Working principle:

[0034] The ammonium nitrate solution first enters the preheater 2 through the liquid inlet. It is preheated using secondary steam from the second-effect flash tank 4, raising the material temperature and reducing the energy required for subsequent evaporation. The preheated ammonium nitrate solution then enters the first-effect flash tank 3 through a rotating nozzle 5. The rotating nozzle 5 evenly sprays the liquid upward, forming a uniform liquid film and increasing the gas-liquid contact area. Steam provided by the heating tank 1 enters the air inlet of the first-effect flash tank 3, where it comes into countercurrent contact with the liquid to transfer heat. An inclined guide plate 6 guides the steam upward in a spiral, creating turbulent flow, enhancing gas-liquid mixing, extending contact time, and improving heat transfer efficiency. The secondary steam generated in the first-effect flash tank 3 is compressed by a heat pump, raising its temperature and pressure, before entering the second-effect flash tank 4 as a heating medium. The process within the second-effect flash tank 4 is similar to that of the first-effect flash tank. The design of the rotating nozzle 5 and guide plate 6 further improves heat transfer and evaporation efficiency. The secondary steam generated in the second-effect flash tank 4 is compressed by the heat pump and then enters the preheater 2 to preheat the incoming material. Steam generated in preheater 2 enters heating tank 1, providing steam for the first-effect flash tank 3. The heat pump and preheater 2 achieve multi-stage steam recycling within the system, maximizing thermal energy efficiency and reducing steam emissions and waste. After double-effect evaporation and concentration, the ammonium nitrate solution reaches the desired concentration and is ready for subsequent granulation, drying, and other processes.

Claims

1. A liquid ammonium nitrate double-effect concentration system, characterized by: The invention comprises a first-effect flash tank (3) and a second-effect flash tank (4) connected in sequence, wherein the air outlet of the first-effect flash tank (3) is connected to the air inlet of the second-effect flash tank (4), and the liquid outlet of the first-effect flash tank (3) is connected to the liquid inlet of the second-effect flash tank (4); the liquid inlets of the first-effect flash tank (3) and the second-effect flash tank (4) are both provided with a rotating nozzle (5) for uniformly spraying the incoming ammonium nitrate solution upwards; and the air inlets of the first-effect flash tank (3) and the second-effect flash tank (4) are arranged below the liquid inlet.

2. A liquid ammonium nitrate double-effect concentration system according to claim 1, characterized in that: The rotating spray head (5) comprises at least one nozzle, and the opening of the nozzle is arranged in a fan shape.

3. A liquid ammonium nitrate double-effect concentration system according to claim 1, characterized in that: A plurality of square guide plates (6) are fixedly mounted on the inner walls of the first-effect flash tank (3) and the second-effect flash tank (4), and the plurality of guide plates (6) are alternately arranged with a downward tilt, and the tilt angle is 30°-45°.

4. A liquid ammonium nitrate double-effect concentration system according to claim 3, characterized in that: The guide plate (6) is provided with a guide hole.

5. A liquid ammonium nitrate double-effect concentration system according to claim 4, characterized in that: The guide holes on the guide plate (6) are circular holes with a diameter of 5-20 mm and are evenly distributed on the guide plate (6).

6. A liquid ammonium nitrate double-effect concentration system according to claim 1, characterized in that: The air outlet of the first-effect flash tank (3) and the air inlet of the second-effect flash tank (4) are connected via a heat pump.

7. The liquid ammonium nitrate double-effect concentration system according to claim 1, characterized in that: The liquid ammonium nitrate double-effect concentration system further comprises a preheater (2), and the air outlet of the second-effect flash tank (4) is connected to the air inlet of the preheater (2).

8. The liquid ammonium nitrate double-effect concentration system according to claim 1, characterized in that: The air outlet of the second-effect flash tank (4) and the air inlet of the preheater (2) are connected via a heat pump.

9. The liquid ammonium nitrate double-effect concentration system according to claim 1, characterized in that: The liquid ammonium nitrate double-effect concentration system further comprises a heating tank (1) for supplying heat to the first-effect flash tank (3), and the air outlet of the preheater (2) is connected to the air inlet of the heating tank (1).

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