Calcium ammonium nitrate production system

Abstract

The utility model belongs to a calcium ammonium nitrate production system. Comprising a calcium ammonium nitrate production unit and an oil ring type vacuumizing unit connected with the calcium ammonium nitrate production unit, the calcium ammonium nitrate production unit at least comprises a single-effect condensate separator, a gas phase outlet of the single-effect condensate separator is connected with a single-effect evaporator, a gas phase outlet of the single-effect evaporator is connected with a single-effect evaporation separator, a gas phase of the single-effect evaporation separator is connected with a single-effect evaporation condenser, and a gas phase of the single-effect evaporation condenser is connected with a gas phase outlet of the single-effect evaporator. A gas phase outlet of the single-effect evaporative condenser is connected with the oil ring type vacuumizing unit; the oil ring type vacuumizing unit at least comprises a membrane type separation assembly capable of realizing oil-water separation; the device has the characteristics that the energy consumption is low, the efficiency is high, cavitation and icing phenomena are avoided, the running state of the device is stable, circulating oil can flow back and be recycled, waste is reduced, and the cost is saved.

Description

Technical Field

[0001] This utility model belongs to the field of ammonium calcium nitrate production technology, and specifically relates to an ammonium calcium nitrate production system. Background Technology

[0002] The production process of calcium ammonium nitrate includes acid hydrolysis, neutralization and pressure filtration, proportioning, evaporation and concentration, granulation, sieving, and cooling. A water jet vacuum pump is typically used to evacuate the evaporation system. The working principle of the water jet vacuum pump is based on the water jet effect; when water enters the high-speed nozzle, the sudden reduction in cross-sectional area causes a rapid increase in water velocity, resulting in changes in the water's static pressure and kinetic energy. After the water flows out of the nozzle, the flow velocity rapidly decreases, and energy is transferred in different ways. Kinetic energy is converted into the impact force of the jet water, and the resulting pressure can be used to expel gas. The theoretical efficiency of the water jet vacuum pump is only about 33%, even if considered an ideal pump. Maintaining a continuous water flow during the vacuuming process leads to relatively high energy consumption. Furthermore, since the working medium of the water jet vacuum pump is water, it is sensitive to temperature changes. In low-temperature environments, the water may freeze, affecting the pump's normal operation; in high-temperature environments, cavitation is prone to occur, leading to a reduction in pump flow rate and head, thus lowering the equipment's efficiency. Furthermore, since the gas phase contains a large amount of water, when an oil ring vacuum pump is used, the combination of oil and water will cause the circulating oil to separate and emulsify, resulting in a large waste of circulating oil and thus increasing the production cost of calcium ammonium nitrate. Utility Model Content

[0003] The purpose of this invention is to overcome the defects in the prior art and provide a calcium ammonium nitrate production system.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0005] A calcium ammonium nitrate production system includes a calcium ammonium nitrate production unit and an oil-ring vacuum unit connected to the calcium ammonium nitrate production unit. The calcium ammonium nitrate production unit includes at least a single-effect condensate separator. The gas phase outlet of the single-effect condensate separator is connected to a single-effect evaporator, the gas phase outlet of the single-effect evaporator is connected to a single-effect evaporator separator, the gas phase outlet of the single-effect evaporator separator is connected to a single-effect evaporator condenser, and the gas phase outlet of the single-effect evaporator condenser is connected to the oil-ring vacuum unit. The oil-ring vacuum unit includes at least a membrane separation component capable of separating oil and water.

[0006] The beneficial effects of this utility model are as follows: It abandons the technical solution of using a water jet vacuum pump in the traditional technology, and improves the efficiency and reduces the impact of temperature on the vacuum pumping unit by using an oil ring vacuum pumping unit. Furthermore, by setting a membrane separation component, it can separate the circulating oil and water in time after vacuuming, so as to ensure that it can be used for a long time.

[0007] Preferably, the oil ring vacuum unit includes a vacuum pump, the material inlet of which is connected to the gas phase outlet of the single-effect evaporator condenser, the gas phase outlet of which is connected to a gas exhaust pipe, the medium outlet of which is connected to a membrane separation component, and the circulating oil outlet of the membrane separation component is connected to the medium inlet of the vacuum pump through a heat exchanger and an oil storage tank.

[0008] Preferably, the membrane separation assembly includes a membrane separation shell, a baffle is provided in the lower inner part of the membrane separation shell, the baffle and the lower inner part of the membrane separation shell together form a water guide channel, an outlet is provided on the membrane separation shell corresponding to the lower part of the water guide channel, an inlet is provided on the baffle, a water-permeable membrane column is installed on the inlet, an oil-water mixture inlet is provided at one end of the membrane separation shell, and a circulating oil outlet is provided at the other end of the membrane separation shell.

[0009] Preferably, the permeable membrane columns and the water inlet holes are arranged in a one-to-one correspondence. There are several permeable membrane columns, which are arranged in a row between the oil-water mixture inlet and the circulating oil outlet. Each row of permeable membrane columns is provided with a rotatable spiral guide plate at the front.

[0010] Preferably, the gas phase outlet of the single-effect evaporator condenser is connected to the material inlet of the vacuum pump via a buffer tank and a valve assembly.

[0011] Preferably, the gas exhaust pipe is equipped with an exhaust tank, and the outlet of the exhaust tank is connected to the scrubbing tower.

[0012] Preferably, the liquid phase outlet of the single-effect condensate separator is connected to the proportioning tank.

[0013] Preferably, the liquid phase outlet at the bottom of the single-effect evaporator is connected to the circulation inlet of the single-effect condensate separator, and the circulation inlet at the bottom of the single-effect evaporator is connected to the liquid phase outlet at the bottom of the single-effect evaporator separator.

[0014] Preferably, the liquid phase outlet of the single-effect evaporator condenser is connected to the process condensate tank.

[0015] Preferably, the single-effect evaporator condenser is further provided with a circulating water heat exchange channel, the inlet of which is connected to the circulating water inlet pipe, and the outlet of which is connected to the circulating water return pipe.

[0016] The ammonium calcium nitrate production system described above contains water. Therefore, a water jet vacuum pump is commonly used during the vacuuming process. This method suffers from low efficiency and susceptibility to temperature fluctuations. At low temperatures, the water may freeze, affecting the pump's normal operation; at high temperatures, cavitation can occur, reducing the pump's flow rate and head, thus lowering equipment efficiency. Therefore, this invention abandons the traditional approach and adopts an oil ring vacuum unit. This method offers advantages such as high efficiency and minimal temperature influence. Furthermore, to overcome the impact of water on the circulating oil, this invention employs a combination of a membrane separation component and a buffer tank. In this method, the buffer tank is positioned at the front end... This invention enables the separation of large quantities of water and gas, thereby reducing the operating load of the oil-ring vacuum unit and the separation load of the membrane separation component. The circulating oil after passing through the vacuum pump immediately enters the subsequent membrane separation component to achieve rapid oil-water separation, thus ensuring the service life of the circulating oil. The membrane separation component described in this invention also includes a spiral guide plate. Based on the different densities of oil and water, the spiral guide plate can generate centrifugal force between the oil and water while keeping the water on the outside, thus facilitating its rapid passage through the water-permeable membrane column and improving the oil-water separation efficiency. It features low energy consumption, high efficiency, no cavitation or icing, stable equipment operation, and the ability to recirculate and reuse the circulating oil, reducing waste and saving costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the structure of the membrane separation component of this utility model.

[0020] Figure 3 for Figure 2 AA view in the middle.

[0021] In the image above:

[0022] 1. Single-effect condensate separator; 2. Single-effect evaporator; 3. Single-effect evaporator separator; 4. Single-effect evaporator condenser; 5. Membrane separation module; 6. Buffer tank; 7. Vacuum pump; 8. Heat exchanger; 9. Oil storage tank; 10. Membrane separation shell; 11. Baffle; 12. Circulating water inlet pipe; 13. Circulating water return pipe; 14. Water guide channel; 15. Water outlet; 16. Circulating oil outlet; 17. Permeable membrane column; 18. Oil-water mixture inlet; 19. Spiral guide plate; 20. Valve assembly; 21. Exhaust tank; 22. Scrubber; 23. Proportioning tank; 24. Process condensate tank. Detailed Implementation

[0023] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0024] Reference Figure 1 This invention relates to a calcium ammonium nitrate production system, comprising a calcium ammonium nitrate production unit and an oil-ring vacuum unit connected to the calcium ammonium nitrate production unit. The calcium ammonium nitrate production unit includes at least a single-effect condensate separator 1, the gas phase outlet of which is connected to a single-effect evaporator 2. The gas phase outlet of the single-effect evaporator 2 is connected to a single-effect evaporator separator 3, and the gas phase outlet of the single-effect evaporator separator 3 is connected to a single-effect evaporator condenser 4. The gas phase outlet of the single-effect evaporator condenser 4 is connected to the oil-ring vacuum unit. The oil-ring vacuum unit includes at least a membrane separation component 5 capable of separating oil and water. This invention utilizes the oil-ring vacuum unit to vacuum a single-effect evaporation system. Compared to traditional water jet vacuum pumps, this process offers higher efficiency and avoids the influence of temperature. Furthermore, by incorporating the membrane separation component 5 capable of separating oil and water, this invention can promptly separate water from the circulating oil, thereby preventing water from affecting the circulating oil and ensuring the long-term stable operation of the oil-ring vacuum unit.

[0025] Furthermore, the oil-ring type vacuum unit includes a vacuum pump 7. The material inlet of the vacuum pump 7 is connected to the gas phase outlet of the single-effect evaporator condenser 4, the gas phase outlet of the vacuum pump 7 is connected to a gas exhaust pipe, and the medium outlet of the vacuum pump 7 is connected to a membrane separation component 5. The circulating oil outlet 16 of the membrane separation component 5 is connected to the medium inlet of the vacuum pump 7 through a heat exchanger 8 and an oil storage tank 9. This invention employs an oil-ring type vacuum unit. Due to the presence of the oil ring, a sealed space is formed inside the pump, allowing the gas to be effectively compressed and discharged. Simultaneously, the circulating oil in the oil-ring type vacuum unit also has lubricating, sealing, and cooling functions, thereby protecting the pump impeller and other components from damage.

[0026] Furthermore, referring to Figure 2 , 3 The membrane separation assembly 5 includes a membrane separation housing 10. A baffle 11 is provided in the lower inner part of the membrane separation housing 10. The baffle 11 and the lower inner part of the membrane separation housing 10 together form a water guide channel 14. A water outlet 15 is provided on the membrane separation housing 10 corresponding to the lower part of the water guide channel 14. A water inlet is provided on the baffle 11. A water permeable membrane column 17 is installed on the water inlet. An oil-water mixture inlet 18 is provided at one end of the membrane separation housing 10. A circulating oil outlet 16 is provided at one end of the membrane separation housing 10. This invention achieves the purpose of separating oil and water by setting up a membrane separation component 5. Specifically, by setting up a permeable membrane column 17, water in the oil-water separation process can pass through the permeable membrane column 17 and enter the water guide channel 14 formed by the baffle 11 and the lower part of the membrane separation shell 10 under its own gravity through the water inlet hole, and be discharged through the water outlet 15. Meanwhile, the circulating oil that cannot pass through the permeable membrane column 17 enters the heat exchanger 8 through the circulating oil outlet 16 for subsequent circulation.

[0027] Furthermore, referring to Figure 2 , 3 The permeable membrane columns 17 and the water inlet holes are arranged in a one-to-one correspondence. There are several permeable membrane columns 17 arranged in rows between the oil-water mixture inlet 18 and the circulating oil outlet 16. Each row of permeable membrane columns 17 has a rotatable spiral guide plate 19 at its front. In this invention, there are multiple permeable membrane columns 17 arranged in rows, preferably with the same number of permeable membrane columns 17 in each row. The rotatable spiral guide plate 19 is located at the front of each row of permeable membrane columns 17. The rotation of the spiral guide plate 19 generates centrifugal force on the oil-water mixture, thereby accelerating oil-water separation. During the separation process, the water in the oil-water mixture enters the water inlet hole through the permeable membrane columns 17, while the oil travels to the other end of the membrane separation housing 10 through the gaps between adjacent permeable membrane columns 17. The above structure can effectively improve the oil-water separation efficiency and achieve the normal operation of the oil ring vacuum unit while ensuring the quality of the circulating oil.

[0028] Furthermore, the gas phase outlet of the single-effect evaporator condenser 4 is connected to the material inlet of the vacuum pump 7 via a buffer tank 6 and a valve assembly 20. This invention, by setting up the buffer tank 6, can buffer the gas phase, simultaneously separate moisture from the gas phase, and remove impurities and particulate matter. This process reduces the operating load of the vacuum pump 7 and the oil-water separation load of the subsequent membrane separation component 5. Furthermore, it prevents impurities and particulate matter from entering the vacuum pump 7, affecting its normal operation and service life, and reduces friction between vacuum pump components, extending its service life. The valve assembly 20 in this invention may include an electrically operated butterfly valve, a ball valve, and a low-resistance return valve. The electrically operated butterfly valve is connected to an automated control system to achieve remote control and automatic adjustment, improving efficiency and control accuracy.

[0029] Furthermore, the gas exhaust pipe is equipped with an exhaust tank 21, and the outlet of the exhaust tank 21 is connected to the scrubbing tower 22. By setting the exhaust tank 21, the gas can be buffered, so as to achieve the characteristic of being sent into the scrubbing tower 22 for scrubbing treatment under a stable pressure.

[0030] Furthermore, the liquid phase outlet of the single-effect condensate separator 1 is connected to the proportioning tank 23.

[0031] Furthermore, the liquid phase outlet at the bottom of the single-effect evaporator 2 is connected to the circulation inlet of the single-effect condensate separator 1, and the circulation inlet at the bottom of the single-effect evaporator 2 is connected to the liquid phase outlet at the bottom of the single-effect evaporator separator 3.

[0032] Furthermore, the liquid phase outlet of the single-effect evaporator condenser 4 is connected to the process condensate tank 24.

[0033] Furthermore, the single-effect evaporator condenser 4 is also provided with a circulating water heat exchange channel. The inlet of the circulating water heat exchange channel is connected to the circulating water inlet pipe 12, and the outlet of the circulating water heat exchange channel is connected to the circulating water return pipe 13.

[0034] The working principle of this invention is as follows: The ammonium calcium nitrate solution completes the evaporation process in a single-effect evaporator 2, reaching the evaporation endpoint. The operating pressure of the single-effect evaporation system is -0.076 MPa, and the evaporation endpoint temperature is 125℃. The negative pressure of the system is maintained by an oil-ring type vacuum unit. The condensate enters the single-effect condensate separator 1 from the single-effect evaporator 2, and then enters the proportioning tank 23 from the lower outlet of the single-effect condensate separator 1. The steam re-enters the single-effect evaporator 2 from the gas phase outlet of the single-effect condensate separator 1. The ammonium calcium nitrate solution enters the single-effect evaporator separator 3 and circulates between the single-effect evaporator 2 and the single-effect evaporator separator 3 for evaporation. The evaporated liquid enters the separator and is pumped to the main granulator. The secondary steam from the single-effect evaporator separator 3 enters the single-effect evaporator condenser 4, where it is indirectly condensed using circulating water. The condensate is collected in the process condensate tank 24. The vapor phase outlet of the shell side of the single-effect evaporator condenser 4 is connected to the buffer tank 6. The buffer tank 6 is used to buffer the vapor phase. During the buffering process, impurities and particulate matter are separated from the vapor phase along with some water, thereby reducing the operating load of the oil ring vacuum unit and the separation load of the membrane separation component 5. At the same time, it can also improve the medium drawn into the vacuum pump 7, thereby extending the service life of the vacuum pump 7. The outlet of the vacuum pump 7 is circulated sequentially through the membrane separation component 5, the heat exchanger 8, and the oil storage tank 9. When the circulating oil volume is low, it can be replenished through the oil storage tank 9. The membrane separation component 5 is a pipeline-type oil-gas-water membrane separator. Specifically... The oil-water mixture enters the membrane separation shell 10 through the vacuum pump 7 and the oil-water mixture inlet 18. The rotation of the spiral guide plate 19 generates centrifugal force on the oil-water mixture. Since the density of water is greater than that of oil, the water is on the outside and the oil is on the inside when centrifugal force is generated. At this time, the water first contacts the permeable membrane column 17 and enters the permeable membrane column 17. Under its own gravity, the water enters the water guide trough 14 and is finally discharged through the outlet 15. The circulating oil cannot pass through the permeable membrane column 17, so it enters the heat exchanger 8 through the circulating oil outlet 16 at the other end of the membrane separation shell 10. The heat exchanger 8 is preferably a plate heat exchanger. After heat exchange, it enters the oil storage tank 9. In actual use, since calcium ammonium nitrate is easily soluble in water, the membrane separation component 5 can absorb the residual calcium ammonium nitrate while achieving oil-water separation. It has the characteristics of high efficiency, no cavitation or icing, stable equipment operation, and the ability to realize circulating oil return and recycling.

[0035] 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 calcium ammonium nitrate production system, characterized by: The production system includes a calcium ammonium nitrate production unit and an oil ring vacuum unit connected to the calcium ammonium nitrate production unit. The ammonium calcium nitrate production unit includes at least a single-effect condensate separator (1), the gas phase outlet of the single-effect condensate separator (1) is connected to a single-effect evaporator (2), the gas phase outlet of the single-effect evaporator (2) is connected to a single-effect evaporator separator (3), the gas phase of the single-effect evaporator separator (3) is connected to a single-effect evaporator condenser (4), and the gas phase outlet of the single-effect evaporator condenser (4) is connected to an oil ring vacuum unit. The oil ring vacuum unit includes at least a membrane separation component (5) capable of separating oil and water.

2. The calcium ammonium nitrate production system of claim 1, wherein: The oil ring vacuum unit includes a vacuum pump (7), the material inlet of the vacuum pump (7) is connected to the gas phase outlet of the single-effect evaporator condenser (4), the gas phase outlet of the vacuum pump (7) is connected to the gas exhaust pipe, the medium outlet of the vacuum pump (7) is connected to the membrane separation component (5), and the circulating oil outlet (16) of the membrane separation component (5) is connected to the medium inlet of the vacuum pump (7) through a heat exchanger (8) and an oil storage tank (9).

3. The calcium ammonium nitrate production system of claim 2, wherein: The membrane separation assembly (5) includes a membrane separation housing (10), a baffle (11) is provided in the lower part of the membrane separation housing (10), the baffle (11) and the lower part of the membrane separation housing (10) together form a water guide channel (14), an outlet (15) is provided on the membrane separation housing (10) corresponding to the lower part of the water guide channel (14), an inlet hole is provided on the baffle (11), a water permeable membrane column (17) is installed on the inlet hole, an oil-water mixture inlet (18) is provided at one end of the membrane separation housing (10), and a circulating oil outlet (16) is provided at one end of the membrane separation housing (10).

4. The ammonium calcium nitrate production system according to claim 3, characterized in that: The permeable membrane column (17) and the water inlet are arranged in a one-to-one correspondence. There are several permeable membrane columns (17), and the several permeable membrane columns (17) are arranged in a row between the oil-water mixture inlet (18) and the circulating oil outlet (16). Each row of permeable membrane columns (17) is provided with a rotatable spiral guide plate (19) at the front.

5. The calcium ammonium nitrate production system of claim 2, wherein: The gas phase outlet of the single-effect evaporator condenser (4) is connected to the material inlet of the vacuum pump (7) through a buffer tank (6) and a valve group (20).

6. The calcium ammonium nitrate production system of claim 2, wherein: The gas exhaust pipe is equipped with an exhaust tank (21), and the outlet of the exhaust tank (21) is connected to the scrubbing tower (22).

7. The calcium ammonium nitrate production system of claim 1, wherein: The liquid phase outlet of the single-effect condensate separator (1) is connected to the proportioning tank (23).

8. The calcium ammonium nitrate production system of claim 1, wherein: The liquid phase outlet at the bottom of the single-effect evaporator (2) is connected to the circulation inlet of the single-effect condensate separator (1), and the circulation inlet at the bottom of the single-effect evaporator (2) is connected to the liquid phase outlet at the bottom of the single-effect evaporator separator (3).

9. The calcium ammonium nitrate production system of claim 1, wherein: The liquid phase outlet of the single-effect evaporator condenser (4) is connected to the process condensate tank (24).

10. The calcium ammonium nitrate production system of claim 9, wherein: The single-effect evaporator condenser (4) is also provided with a circulating water heat exchange channel. The inlet of the circulating water heat exchange channel is connected to the circulating water inlet pipe (12), and the outlet of the circulating water heat exchange channel is connected to the circulating water return pipe (13).

Images