A ternary precursor material mother liquor deamination treatment system

Abstract

This utility model discloses a ternary precursor material mother liquor ammonia removal treatment system, including an ammonia removal tower, a falling film evaporator, a dilute ammonia water tank, a condenser, and an ammonia water storage tank. The top of the ammonia removal tower is connected to the shell side of the falling film evaporator section via an ammonia gas outlet pipe, and the bottom of the ammonia removal tower is connected to the gas-liquid separation section via a liquid outlet pipe. The shell side of the falling film evaporator section is connected to the cooling inlet end of the condenser via an ammonia gas outlet pipe, and the cooling outlet end of the condenser is connected to the ammonia water storage tank. A dilute ammonia water inlet pipe and a reflux pipe are connected between the shell side of the falling film evaporator section and the top of the dilute ammonia water tank. A liquid outlet pipe is connected to the gas-liquid separation section. A reflux pipe and a falling film circulation pump are connected between the liquid outlet pipe and the top of the tube side of the falling film evaporator section. A vapor compression unit is provided between the gas-liquid separation section and the ammonia removal tower. This utility model has the advantages of reducing the amount of vapor used in the ammonia removal tower, reducing energy consumption, achieving good ammonia removal effect from the mother liquor, achieving good ammonia water recovery effect, low system operating cost, and stable and reliable operation.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery wastewater treatment technology, specifically to a ternary precursor material mother liquor deammoniation treatment system. Background Technology

[0002] Current processes for treating ternary precursor wastewater involve adjusting the pH of the wash water to 5-6 and then pumping it into a wash water concentration system containing a primary ultrafiltration membrane and multiple reverse osmosis membranes using a high-pressure pump. This produces a concentrate and pure water. The concentrate obtained from the wash water is then mixed with the mother liquor produced during the ternary precursor synthesis reaction and fed into a stripping ammonia removal tower for stripping ammonia removal. Patent publication number CN207877495U discloses a lithium-ion battery cathode ternary precursor wastewater treatment device, which includes an ammonia removal tower, a condenser reflux unit, a heat exchanger, a pH adjustment tank, an ammonia washing tower, a falling film evaporator, a preheater, a gas-liquid separator, a condensate tank, a crystallization heater, a crystallization separator, a compressor, a secondary compressor, and a thickener. This device reduces energy consumption and improves the economic benefits for enterprises. However, it suffers from problems such as poor ammonia recovery, complex system structure, and poor operational stability. Utility Model Content

[0003] The technical problem this invention aims to solve is to overcome existing defects and provide a ternary precursor material mother liquor deammoniation treatment system. This system reduces heat loss from the mother liquor, significantly reduces the amount of steam used in the deammoniation tower, lowers energy consumption, and improves the system's deammoniation effect on the mother liquor. It also achieves good ammonia recovery, reduces the amount of ammonia-containing vapor processed by the condenser, and allows for adjustment of the concentration of recovered ammonia. Furthermore, the system has a simple structure, low operating costs, and stable and reliable operation, effectively solving the problems in the background technology.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a mother liquor deammoniation treatment system for ternary precursor materials, comprising a deammoniation tower, a falling film evaporator, a dilute ammonia tank, a condenser, and an ammonia storage tank. The upper side of the deammoniation tower is connected to a mother liquor inlet pipe, on which a feed pump is installed. The lower side of the deammoniation tower is connected to a steam inlet pipe. The upper section of the falling film evaporator is a falling film evaporation section, and the lower section is a gas-liquid separation section. The top of the deammoniation tower is connected to the upper side of the shell side of the falling film evaporation section via an ammonia outlet pipe. The bottom of the deammoniation tower is connected to the gas-liquid separation section via a liquid outlet pipe, on which a bottom water pump is installed. The lower side of the shell side of the falling film evaporation section is connected to the cooling inlet of the condenser via an ammonia outlet pipe, and the cooling outlet of the condenser is connected to the inlet of the ammonia storage tank. The lower side of the shell side of the falling film evaporation section is connected to the dilute ammonia storage tank. The top of the ammonia tank is connected to a dilute ammonia inlet pipe and a reflux pipe 1. The liquefied dilute ammonia at the bottom of the shell side of the falling film evaporation section flows into the dilute ammonia tank through the dilute ammonia inlet pipe. The vapor and ammonia inside the dilute ammonia tank can re-enter the shell side of the falling film evaporation section through the reflux pipe 1. The bottom of the dilute ammonia tank is equipped with a dilute ammonia outlet pipe. The bottom of the gas-liquid separation section is connected to a liquid outlet pipe 2, which is equipped with a discharge pump. The outlet end of the discharge pump is connected to two liquid outlet branch pipes with solenoid valves through a tee. The liquid outlet pipe 2 is also connected to a reflux pipe 2 with a solenoid valve. The end of the reflux pipe 2 is connected to the top of the tube side of the falling film evaporation section. The reflux pipe 2 is connected to a falling film circulation pump. A vapor compression unit is provided between the gas-liquid separation section and the deammoniation tower. The vapor compression unit is used to compress the low-temperature vapor in the gas-liquid separation section into high-temperature vapor and send it to the deammoniation tower.

[0005] Furthermore, the steam compression unit includes a primary steam compressor, a buffer tank, and a secondary steam compressor connected in sequence via pipelines. The gas-liquid separation section is connected to the inlet of the primary steam compressor via a steam delivery pipe, and the outlet of the secondary steam compressor is connected to the lower side of the deammoniation tower via a steam reflux pipe.

[0006] Furthermore, an anti-surge pipe is provided between the steam delivery pipe and the steam return pipe, and an anti-surge valve is also provided on the anti-surge pipe.

[0007] Furthermore, a dilute ammonia pump is connected to the dilute ammonia outlet pipe of the dilute ammonia tank. The dilute ammonia outlet pipe is connected to a dilute ammonia reflux pipe with a solenoid valve and a dilute ammonia delivery pipe via a tee. The dilute ammonia reflux pipe is connected to the upper side of the deammoniation tower, and the dilute ammonia delivery pipe is connected to the tail end of the ammonia outlet pipe two. A reflux pipe four with a solenoid valve is connected to the side wall of the ammonia storage tank. An ammonia delivery pump is installed on the reflux pipe four, and the reflux pipe four is connected to the dilute ammonia reflux pipe.

[0008] Furthermore, the liquid outlet pipe is connected to a reflux pipe five equipped with a solenoid valve, and the reflux pipe five is connected to the upper side of the deammoniation tower.

[0009] Furthermore, an alkali inlet pipe is connected to the mother liquor inlet pipe, and an alkali pump is connected to the alkali inlet pipe.

[0010] Furthermore, the steam inlet pipe is equipped with a steam branch pipe with a solenoid valve, and the steam branch pipe is connected to the gas-liquid separation section.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: This ternary precursor material mother liquor deammoniation treatment system utilizes the heat in the mother liquor to convert it into steam for the deammoniation tower through a falling film evaporator and a vapor compression unit, reducing heat loss from the mother liquor, greatly reducing the amount of steam used in the deammoniation tower, reducing energy consumption, and improving the system's deammoniation effect on the mother liquor; the falling film evaporator lowers the temperature of the ammonia-containing vapor flowing out from the top of the deammoniation tower, improving the cooling and liquefaction effect of the ammonia-containing vapor after entering the condenser, and improving the ammonia water recovery effect; the dilute ammonia water collected in the shell side of the falling film evaporator by the dilute ammonia water tank reduces the amount of ammonia-containing vapor processed by the condenser, and can adjust the concentration of the recovered ammonia water. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present utility model;

[0013] Figure 2 This is a schematic diagram of the pipeline connection for the ammonia removal tower of this utility model;

[0014] Figure 3 This is a schematic diagram of the piping connection of the falling film evaporator of this utility model;

[0015] Figure 4 This is a schematic diagram of the structure of the second embodiment of the present utility model.

[0016] In the diagram: 1. Ammonia removal tower; 2. Mother liquor inlet pipe; 3. Feed pump; 4. Steam inlet pipe; 41. Steam branch pipe; 5. Ammonia outlet pipe 1; 6. Falling film evaporator; 61. Falling film evaporation section; 62. Gas-liquid separation section; 7. Liquid outlet pipe 1; 8. Bottom water pump; 9. Dilute ammonia water tank; 10. Dilute ammonia water inlet pipe; 11. Reflux pipe 1; 12. Ammonia outlet pipe 2; 13. Condenser; 14. Ammonia water storage tank; 15. Liquid outlet pipe 2; 16. Feed pump; 17. 18. Outlet branch pipe; 19. Return pipe II; 20. Falling film circulation pump; 21. Steam delivery pipe; 22. First-stage steam compressor; 23. Buffer tank; 24. Second-stage steam compressor; 25. Steam return pipe; 26. Anti-surge pipe; 27. Anti-surge valve; 28. Alkali inlet pipe; 29. ​​Alkali pump; 30. Dilute ammonia water return pipe; 31. Dilute ammonia water pump; 32. Ammonia water delivery pipe; 33. Return pipe IV; 34. Return pipe V. Detailed Implementation

[0017] 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. Example 1

[0018] Please see Figure 1-3 This utility model provides a technical solution: a ternary precursor material mother liquor deammoniation treatment system, including a deammoniation tower 1, a falling film evaporator 6, a dilute ammonia water tank 9, a condenser 13, and an ammonia water storage tank 14. The upper side of the deammoniation tower 1 is connected to a mother liquor inlet pipe 2, and a feed pump 3 is installed on the mother liquor inlet pipe 2. An alkali inlet pipe 27 is connected to the mother liquor inlet pipe 2, and an alkali pump 28 is connected to the alkali inlet pipe 27. A steam inlet pipe 4 is connected to the lower side of the deammoniation tower 1.

[0019] The upper section of the falling film evaporator 6 is the falling film evaporation section 61, and the lower section is the gas-liquid separation section 62. The top of the ammonia removal tower 1 is connected to the upper side of the shell side of the falling film evaporation section 61 via an ammonia outlet pipe 5. The bottom of the ammonia removal tower 1 is connected to the gas-liquid separation section 62 via a liquid outlet pipe 7. A tower bottom water pump 8 is installed on the liquid outlet pipe 7. The lower side of the shell side of the falling film evaporation section 61 is connected to the cooling inlet end of the condenser 13 via an ammonia outlet pipe 12. The cooling outlet end of the condenser 13 is connected to the inlet end of the ammonia storage tank 14. A dilute ammonia inlet pipe 10 and a reflux pipe 11 are connected between the lower side of the shell side of the falling film evaporation section 61 and the top of the dilute ammonia tank 9. The liquefied dilute ammonia at the bottom of the shell side of the falling film evaporation section 61 can flow into the dilute ammonia tank 9 through the dilute ammonia inlet pipe 10. The steam and ammonia inside the dilute ammonia tank 9 can re-enter the shell side of the falling film evaporation section 61 through the reflux pipe 11. The bottom of the dilute ammonia tank 9 is equipped with a dilute ammonia outlet pipe. The bottom of the gas-liquid separation section 62 is connected to the liquid outlet pipe 15, and the liquid outlet pipe 15 is equipped with a discharge pump 16. The outlet end of the discharge pump 16 is connected to two liquid outlet branch pipes 17 with solenoid valves through a tee. The liquid outlet pipe 15 is also connected to the reflux pipe 18 with a solenoid valve. The end of the reflux pipe 18 is connected to the top of the tube side of the falling film evaporation section 61, and the reflux pipe 18 is connected to the falling film circulation pump 19. A steam compression unit is provided between the gas-liquid separation section 62 and the deammoniation tower 1. The steam compression unit is used to compress the low-temperature steam in the gas-liquid separation section 62 into high-temperature steam and send it into the deammoniation tower 1.

[0020] The steam compression unit includes a primary steam compressor 21, a buffer tank 22, and a secondary steam compressor 23 connected in sequence by pipelines. The gas-liquid separation section 62 is connected to the inlet of the primary steam compressor 21 via a steam delivery pipe 20, and the outlet of the secondary steam compressor 23 is connected to the lower side of the deammoniation tower 1 via a steam return pipe 24. An anti-surge pipe 25 is provided between the steam delivery pipe 20 and the steam return pipe 24, and an anti-surge valve 26 is also provided on the anti-surge pipe 25.

[0021] Working principle:

[0022] The mother liquor is fed to the upper side of the deammoniation tower 1 through the mother liquor inlet pipe 2 and the feed pump 3, and steam is fed to the lower side of the deammoniation tower 1 through the steam inlet pipe 4. The mother liquor is deammonerated by the high-temperature steam. The ammonia gas in the mother liquor enters the upper part of the shell side of the falling film evaporation section 61 through the ammonia gas outlet pipe 1 5. At the same time, the mother liquor at the bottom of the deammoniation tower 1 enters the gas-liquid separation section 62 through the liquid outlet pipe 1 7 and the tower bottom water pump 8. A portion of the mother liquor in the gas-liquid separation section 62 is sent to the tube side of the falling film evaporation section 61 through the falling film circulation pump 19 and the reflux pipe 2 18. The ammonia-containing vapor entering the shell side of the falling film evaporation section 61 exchanges heat with the mother liquor entering the tube side of the falling film evaporation section 61, which cools down the ammonia-containing vapor in the shell side of the falling film evaporation section 61. A portion of the ammonia-containing vapor in the shell side of the falling film evaporation section 61 liquefies into dilute ammonia water, and the portion of the ammonia-containing vapor and dilute ammonia water in the shell side of the falling film evaporation section 61 passes through the dilute ammonia water. The inlet pipe 10 enters the dilute ammonia water tank 9. The ammonia vapor entering the dilute ammonia water tank 9 will further reduce the temperature. The unliquefied ammonia vapor in the dilute ammonia water tank 9 and the ammonia gas volatilized from the dilute ammonia water inside the tank will flow back to the shell side of the falling film evaporation section 61 through the return pipe 11, which can further reduce the temperature of the ammonia vapor inside the shell side of the falling film evaporation section 61. Most of the gaseous ammonia vapor inside the shell side of the falling film evaporation section 61 will enter the condenser 13 through the ammonia gas outlet pipe 12. After being cooled by the condenser 13, the ammonia vapor will liquefy into ammonia water and enter the ammonia water storage tank 14. Another part of the mother liquor in the gas-liquid separation section 62 will be sent to the liquid outlet branch pipe 17 through the discharge pump 16. There are two liquid outlet branches 17. One liquid outlet branch pipe 17 can be used to send the mother liquor to the next mother liquor treatment equipment, and the other liquid outlet branch pipe 17 can be used to send the mother liquor that fails the ammonia removal to the ammonia removal tower 1 for circulating ammonia removal treatment.

[0023] The mother liquor in the falling film evaporation section 61 is heated by heat exchange and enters the gas-liquid separation section 62. The steam in the gas-liquid separation section 62 is heated and pressurized by the first-stage steam compressor 21 and sent to the buffer tank 22. Then, it is further heated and pressurized by the second-stage steam compressor 23 and sent to the deammoniation tower 1 through the steam return pipe 24. The heat in the mother liquor is converted into steam for the deammoniation tower 1, reducing the heat loss of the mother liquor and greatly reducing the amount of steam used in the deammoniation tower 1, thus reducing energy consumption. When the amount of steam in the gas-liquid separation section 62 is small, in order to avoid surge phenomenon in the first-stage steam compressor 21 and the second-stage steam compressor 23, the anti-surge valve 26 is in the open state when the deammoniation treatment system starts running, and its opening is gradually closed until it is completely closed during normal operation, so that the first-stage steam compressor 21 and the second-stage steam compressor 23 can operate normally.

[0024] Alkali can be added to the mother liquor inlet pipe 2 through the alkali inlet pipe 27 and the alkali pump 28 to adjust the pH of the mother liquor and ensure the ammonia stripping effect.

[0025] The ternary precursor material mother liquor ammonia removal system disclosed in this embodiment lowers the temperature of ammonia-containing vapor flowing from the top of the ammonia removal tower 1 through the falling film evaporator 6, improving the cooling and liquefaction effect of the ammonia-containing vapor after entering the condenser 13 and enhancing the ammonia water recovery effect. The dilute ammonia water tank 9 collects the liquefied dilute ammonia water within the shell side of the falling film evaporator 6, reducing the amount of ammonia-containing vapor processed by the condenser 13. Furthermore, the dilute ammonia water tank 9 further lowers the temperature of the ammonia-containing vapor inside the shell side of the falling film evaporator section 61, further improving the cooling and liquefaction effect of the ammonia-containing vapor after entering the condenser 13. The system effectively recovers high-ammonia water; by using a falling film evaporator 6 and a steam compression unit to convert the heat in the mother liquor into steam for the deammoniation tower 1, it reduces heat loss from the mother liquor, significantly reduces the amount of steam used in the deammoniation tower 1, lowers energy consumption, and improves the system's deammoniation effect on the mother liquor; and a buffer tank 22, an anti-surge pipe 25, and an anti-surge valve 26 are installed between the primary steam compressor 21 and the secondary steam compressor 23 to ensure the stable operation of the steam compression unit and avoid surge phenomena; the ternary precursor material mother liquor deammoniation treatment system has a simple structure, low system operating cost, and stable and reliable operation. Example 2

[0026] Please refer to the following: Figure 4This utility model also provides a technical solution: a ternary precursor material mother liquor deammoniation treatment system. In this embodiment, compared to Embodiment 1, a dilute ammonia pump 30 is connected to the dilute ammonia outlet pipe of the dilute ammonia tank 9. The dilute ammonia outlet pipe is connected via a tee to a dilute ammonia return pipe 29 with a solenoid valve and a dilute ammonia delivery pipe 31. The dilute ammonia return pipe 29 is connected to the upper side of the deammoniation tower 1, and the dilute ammonia delivery pipe 31 is connected to the tail end of the ammonia outlet pipe 2 12. A return pipe 4 33 with a solenoid valve is connected to the side wall of the ammonia storage tank 14. An ammonia delivery pump 32 is installed on the return pipe 4 33, and the return pipe 4 33 is connected to the dilute ammonia return pipe 29. In the dilute ammonia tank 9... The dilute ammonia water can be sent back to the top of the deammoniation tower 1 for deammoniation treatment via the dilute ammonia water pump 30 and the dilute ammonia water return pipe 29. The ammonia water in the ammonia water storage tank 14 can be sent back to the top of the deammoniation tower 1 for deammoniation treatment via the ammonia water transfer pump 32 and the return pipe 33, thereby increasing the concentration of ammonia water recovered by the system and improving the deammoniation effect of the system on the mother liquor. The dilute ammonia water in the dilute ammonia water tank 9 can also be sent to the ammonia gas outlet pipe 12 via the dilute ammonia water transfer pipe 31. This not only adjusts the concentration of ammonia water in the ammonia water storage tank 14, but also further reduces the temperature of the ammonia gas after the dilute ammonia water mixes with the ammonia vapor in the ammonia gas outlet pipe 12, thereby further improving the ammonia water recovery effect.

[0027] The outlet pipe 7 is connected to a reflux pipe 34 with a solenoid valve, and the reflux pipe 34 is connected to the upper side of the deammoniation tower 1. The mother liquor transported by the outlet pipe 7 can be sent back to the top of the deammoniation tower 1 through the reflux pipe 34 for deammoniation treatment, further improving the deammoniation effect of the system on the mother liquor.

[0028] The steam inlet pipe 4 is equipped with a steam branch pipe 41 with a solenoid valve, which is connected to the gas-liquid separation section 62. When the ammonia removal treatment system starts to run, the solenoid valve on the steam branch pipe 41 is opened, and the steam compression unit can be quickly put into operation through the steam branch pipe 41. After the steam compression unit is running normally, the solenoid valve on the steam branch pipe 41 is adjusted to a smaller opening to reduce the amount of steam used.

[0029] 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 deammoniation treatment system for ternary precursor material mother liquor, comprising a deammoniation tower, a falling film evaporator, a dilute ammonia water tank, a condenser, and an ammonia water storage tank, characterized in that: The upper side of the ammonia removal tower is connected to a mother liquor inlet pipe, which is equipped with a feed pump. The lower side of the ammonia removal tower is connected to a steam inlet pipe. The upper section of the falling film evaporator is a falling film evaporation section, and the lower section is a gas-liquid separation section. The top of the ammonia removal tower is connected to the upper side of the shell side of the falling film evaporation section via an ammonia outlet pipe. The bottom of the ammonia removal tower is connected to the gas-liquid separation section via a liquid outlet pipe, which is equipped with a bottom water pump. The lower side of the shell side of the falling film evaporation section is connected to the cooling inlet of the condenser via an ammonia outlet pipe, and the cooling outlet of the condenser is connected to the inlet of the ammonia storage tank. A dilute ammonia inlet pipe and a reflux pipe are connected between the lower side of the shell side of the falling film evaporation section and the top of the dilute ammonia tank. The bottom of the shell side of the falling film evaporation section is liquefied. Dilute ammonia water can flow into the dilute ammonia water tank through the dilute ammonia water inlet pipe. The vapor and ammonia gas inside the dilute ammonia water tank can re-enter the shell side of the falling film evaporation section through the reflux pipe one. The bottom of the dilute ammonia water tank is equipped with a dilute ammonia water outlet pipe. The bottom of the gas-liquid separation section is connected to the liquid outlet pipe two, which is equipped with a discharge pump. The outlet end of the discharge pump is connected to two liquid outlet branch pipes with solenoid valves through a tee. The liquid outlet pipe two is also connected to the reflux pipe two with a solenoid valve. The end of the reflux pipe two is connected to the top of the tube side of the falling film evaporation section, and the reflux pipe two is connected to a falling film circulation pump. A vapor compression unit is provided between the gas-liquid separation section and the deammoniation tower. The vapor compression unit is used to compress the low-temperature vapor in the gas-liquid separation section into high-temperature vapor and send it to the deammoniation tower.

2. The ternary precursor material mother liquor deammoniation treatment system according to claim 1, characterized in that: The steam compression unit includes a primary steam compressor, a buffer tank, and a secondary steam compressor connected in sequence by pipelines. The gas-liquid separation section is connected to the inlet of the primary steam compressor via a steam delivery pipe, and the outlet of the secondary steam compressor is connected to the lower side of the deammoniation tower via a steam reflux pipe.

3. The ternary precursor material mother liquor deammoniation treatment system according to claim 2, characterized in that: An anti-surge pipe is provided between the steam delivery pipe and the steam return pipe, and an anti-surge valve is also provided on the anti-surge pipe.

4. The ternary precursor material mother liquor deammoniation treatment system according to claim 1, characterized in that: A dilute ammonia pump is connected to the dilute ammonia outlet pipe of the dilute ammonia tank. The dilute ammonia outlet pipe is connected to a dilute ammonia reflux pipe with a solenoid valve and a dilute ammonia delivery pipe through a tee. The dilute ammonia reflux pipe is connected to the upper side of the deammoniation tower, and the dilute ammonia delivery pipe is connected to the tail end of the ammonia outlet pipe two. A reflux pipe four with a solenoid valve is connected to the side wall of the ammonia storage tank. An ammonia delivery pump is installed on the reflux pipe four, and the reflux pipe four is connected to the dilute ammonia reflux pipe.

5. The ternary precursor material mother liquor deammoniation treatment system according to claim 1, characterized in that: The liquid outlet pipe is connected to a reflux pipe five equipped with a solenoid valve, and the reflux pipe five is connected to the upper side of the deammoniation tower.

6. The ternary precursor material mother liquor deammoniation treatment system according to claim 1, characterized in that: The mother liquor inlet pipe is connected to an alkali inlet pipe, and the alkali inlet pipe is connected to an alkali pump.

7. The ternary precursor material mother liquor deammoniation treatment system according to claim 1, characterized in that: The steam inlet pipe is equipped with a steam branch pipe with a solenoid valve, which is connected to the gas-liquid separation section.

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