A liquid ammonia unloading system and control method for lithium battery manufacturing industry

Abstract

The present invention provides a special liquid ammonia unloading system for the lithium battery manufacturing industry and a control method thereof, comprising a control system, a liquid ammonia unloading arm and an unloading pump, wherein a liquid phase outlet is provided on the liquid ammonia unloading arm; further comprising an ammonia aqueous solution preparation device, an ammonia gas circulation pipe, an ammonia absorber and a heat dissipation system; the ammonia aqueous solution preparation device comprises a reaction barrel, which is cylindrical with its long axis arranged in a vertical direction, an ammonia aqueous solution inlet is provided at the top of the reaction barrel, a liquid ammonia or gaseous ammonia inlet is provided at the bottom of the reaction barrel, an ammonia aqueous solution outlet is provided at the bottom of the reaction barrel, and a pressure gauge is provided on the reaction barrel; the present invention aims to propose a special liquid ammonia unloading system for the lithium battery manufacturing industry and a control method thereof, which integrates liquid ammonia gasification and ammonia aqueous solution preparation in the same device, is suitable for input media of gaseous ammonia and liquid ammonia, helps to improve the preparation concentration, and has good absorption effect and stable equipment.

Description

Technical Field

[0001] The invention belongs to the field of ammonia water preparation, and in particular relates to a liquid ammonia unloading system dedicated to the lithium battery manufacturing industry and a control method thereof. Background Art

[0002] During the manufacturing process, lithium batteries must be provided with an alkaline environment. Using ammonia water to adjust the acid-base environment is a relatively common practice. Using ammonia water to adjust the acid-base environment is effective, requires a small amount, and is easy to clean. However, the large amount of ammonia water is inconvenient to transport, so liquid ammonia is usually used for transportation and then converted into ammonia water for easy use. Liquid ammonia is transported to the unloading area by tank trucks, unloaded through the unloading crane, and processed by the ammonia water preparation system. The ammonia water is output and sent to the storage tank. The currently used ammonia water preparation system may leak ammonia during the liquid ammonia gasification process, affecting the environment and posing a safety hazard. The currently used ammonia water preparation system is suitable for preparing ammonia water from liquid ammonia, and the medium is single. Summary of the Invention

[0003] In view of this, the present invention aims to propose a liquid ammonia unloading system and a control method dedicated to the lithium battery manufacturing industry, so as to integrate liquid ammonia gasification and ammonia water preparation in the same equipment. It is suitable for input media of gaseous ammonia and liquid ammonia, helps to improve the preparation concentration, and has good absorption effect and stable equipment.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] The present invention provides a liquid ammonia unloading system dedicated to the lithium battery manufacturing industry, comprising a control system, a liquid ammonia unloading arm, and an unloading pump, wherein the liquid ammonia unloading arm is provided with a liquid phase outlet; an ammonia aqueous solution preparation device, an ammonia gas circulation pipe, an ammonia absorber, and a heat dissipation system; the ammonia aqueous solution preparation device comprises a reaction barrel, which is cylindrical with its long axis arranged in a vertical direction, an ammonia aqueous solution inlet arranged at the top of the reaction barrel, a liquid ammonia or gaseous ammonia inlet arranged at the bottom of the reaction barrel, an ammonia aqueous solution outlet arranged at the bottom of the reaction barrel, and a pressure gauge provided on the reaction barrel;

[0006] The ammonia water inlet is connected to the softened water pipeline via an ammonia absorption pipe, and an ammonia absorber is provided on the ammonia absorption pipe; the softened water pipeline is connected to the softened water source in the factory area, and a thermometer, a pressure gauge, a first pneumatic regulating valve, a first flow meter and a first control valve are provided on the softened water pipeline;

[0007] The lower end of the ammonia circulation pipe is connected to the middle of the reaction barrel, and the upper end is connected to the ammonia absorber; the liquid ammonia or gaseous ammonia inlet is connected to the liquid phase outlet and the plant nitrogen source respectively through the liquid ammonia or gaseous ammonia input pipe;

[0008] The liquid ammonia or gaseous ammonia input pipe is provided with an unloading pump, a pressure gauge, a second pneumatic regulating valve, a second flow meter, a second control valve and a pressure transmitter; the ammonia outlet is connected to the storage tank through an ammonia output pipeline, and the ammonia output pipeline is provided with a concentration meter, a pressure gauge, a thermometer and a temperature transmitter;

[0009] The heat dissipation system includes a heat dissipation pipe, a water inlet pipe, and a water outlet pipe. Cooling water is provided in the heat dissipation pipe. The heat dissipation pipe extends from the top of the reaction barrel to the middle of the reaction barrel. The two ends of the heat dissipation pipe are respectively connected to the water inlet pipe and the water outlet pipe; a temperature gauge and a pressure gauge are provided on the water inlet pipe, and a temperature gauge is provided on the water outlet pipe;

[0010] The signal input end of the control system is connected to the pressure transmitter, the temperature transmitter, the concentration meter, the first flow meter and the second flow meter; the signal output end of the control system is connected to the first pneumatic regulating valve, the first control valve, the second pneumatic regulating valve and the second control valve.

[0011] Furthermore, the ammonia water preparation device also includes a liquid level meter, which is arranged below the middle of the reaction barrel and is used to measure the amount of liquid ammonia in the reaction barrel. The liquid level meter is connected to the control system.

[0012] Furthermore, the ammonia water preparation device also includes an exhaust pipe, one end of the exhaust pipe is connected to the top of the reaction barrel, and the other end is connected to the first ammonia absorption tank. The exhaust pipe is provided with an exhaust manual valve and a safety exhaust valve.

[0013] Furthermore, the ammonia water preparation device also includes a sewage pipe for connecting to a wastewater tank, and the sewage pipe is respectively connected to the middle part of the reaction barrel, the lower part of the reaction barrel and the ammonia water output pipeline.

[0014] Furthermore, a one-way valve, a temperature gauge, an exhaust manual valve and a safety exhaust valve are provided on the ammonia circulation pipe.

[0015] Furthermore, the softened water pipeline, the liquid ammonia or gaseous ammonia input pipeline and the ammonia water output pipeline are respectively provided with parallel conducting pipes, and manual valves are provided on the conducting pipes.

[0016] Furthermore, it also includes a leakage alarm, a shut-off manual valve and an emergency shut-off valve. The leakage alarm includes multiple ones, which are respectively arranged near the liquid ammonia unloading arm, the unloading pump and the liquid ammonia or gaseous ammonia input pipe. The shut-off manual valve and the emergency shut-off valve are respectively arranged at the liquid phase outlet and the gaseous ammonia return pipe.

[0017] Furthermore, a gaseous ammonia inlet is also provided on the liquid ammonia unloading arm, and the gaseous ammonia inlet is connected to the unloading pump through a gaseous ammonia return pipe. The gaseous ammonia return pipe, the liquid ammonia or gaseous ammonia input pipe are respectively connected to the second ammonia absorption tank through a diffuser pipe, and a hand valve is provided on the diffuser pipe.

[0018] The present invention also provides a control method for a liquid ammonia unloading system dedicated to the lithium battery manufacturing industry, comprising the following steps:

[0019] S1 obtains the concentration data collected by the concentration meter, obtains the flow data collected by the first flow meter and the second flow meter;

[0020] S2. Sending instructions to the first pneumatic control valve and / or the second pneumatic control valve according to the concentration data and the flow data.

[0021] Furthermore, the method further includes the following steps:

[0022] S3. Obtain pressure data collected by the pressure transmitter and temperature data collected by the temperature transmitter;

[0023] S4. Sending instructions to the first pneumatic control valve and / or the second pneumatic control valve according to the pressure data and the temperature data.

[0024] Compared with the prior art, the liquid ammonia unloading system and control method for the lithium battery manufacturing industry described in the present invention have the following advantages:

[0025] The special liquid ammonia unloading system described in the present invention can support the input of gaseous ammonia and liquid ammonia, and the system automatically produces ammonia water, with multiple medium requirements. It can directly exchange heat between low-temperature liquid ammonia and high-temperature ammonia water, eliminating the need for traditional process heat exchangers to use circulating water as a heat exchange intermediate medium, thereby improving the heat transfer driving force, greatly improving the heat exchange efficiency, and reducing the heat exchange area. The system has a compact layout and occupies a small area; the process flow is simple; the circulating water consumption is small, it is easy to operate, and the adjustable space is large; the absorption tank is provided to reduce the risk of ammonia leakage.

[0026] The control method of the dedicated liquid ammonia unloading system described in the present invention is a control system that can control the inlet ratio of liquid ammonia and softened water based on data collected by a pressure transmitter, a temperature transmitter, a concentration meter, a first flow meter, and a second flow meter; by adjusting the first pneumatic regulating valve, a first control valve, a second pneumatic regulating valve, and a second control valve, thereby controlling the mixed concentration of the ammonia water. The concentration of the ammonia water can be stabilized within a required range, and ammonia water suitable for use in the lithium battery manufacturing industry can be directly output. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 This is a schematic diagram of the overall structure of the liquid ammonia unloading system according to an embodiment of the present invention;

[0029] Figure 2This is a schematic diagram of an ammonia preparation device and its connection structure according to an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the softened water pipeline, liquid ammonia or gaseous ammonia input pipe and their connection structure according to an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the unloading pump, emergency shut-off valve and their connection structure according to an embodiment of the present invention;

[0032] Figure 5 This is a structural schematic diagram of the ammonia absorber described in an embodiment of the present invention.

[0033] Description of reference numerals:

[0034] Liquid ammonia tank truck; 2-leakage alarm; 3-unloading pump; 4-second ammonia absorption tank; 5-plant nitrogen source; 6-plant softened water source; 7-ammonia circulation pipe; 8-aqueous ammonia preparation device; 9-ammonia absorber; 10-heat dissipation system; 11-first ammonia absorption tank; 12-storage tank; 13-liquid ammonia unloading arm; 14-liquid phase outlet; 15-manual shut-off valve; 16-emergency shut-off valve; 17-liquid ammonia line; 18-nitrogen line; 19-gas diffusion pipe; 20-gas ammonia inlet; 21-gas ammonia return pipe; 101-reaction drum; 102-check valve; 103-safety exhaust valve; 104-manual exhaust valve; 105-liquid ammonia or gaseous ammonia inlet pipe; 106 - Liquid or gaseous ammonia inlet; 107 - Ammonia outlet; 108 - Ammonia output pipeline; 109 - Conducting pipe; 112 - Ammonia inlet; 113 - Ammonia suction pipe; 114 - Softened water pipeline; 116 - Exhaust pipe; 118 - Exhaust absorption pipe; 120 - Water outlet pipe; 121 - Water inlet pipe; 122 - Sewage pipe; 123 - Liquid level gauge; 130 - First pneumatic regulating valve; 131 - First flowmeter; 132 - First control valve; 133 - Second pneumatic regulating valve; 134 - Second flowmeter; 135 - Second control valve; 201 - Inlet; 202 - Single-fluid nozzle; 203 - Suction pipe; 204 - Outlet;

[0035] TG-temperature gauge;

[0036] PG-pressure gauge;

[0037] DN-hand valve;

[0038] TT-temperature transmitter;

[0039] PT-pressure transmitter. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0041] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0042] like Figures 1 to 3 As shown, a liquid ammonia unloading system for lithium battery manufacturing industry includes a control system, a liquid ammonia unloading arm 13 and an unloading pump 3. The liquid ammonia unloading arm 13 is provided with a liquid phase outlet 14; it also includes an ammonia aqueous preparation device 8, an ammonia gas circulation pipe 7, an ammonia absorber 9 and a heat dissipation system 10; the ammonia aqueous preparation device includes a reaction barrel 101, which is cylindrical with its long axis arranged in the vertical direction, an ammonia aqueous inlet 112 is provided at the top of the reaction barrel 101, a liquid ammonia or gaseous ammonia inlet 106 is provided at the bottom of the reaction barrel 101, an ammonia aqueous outlet 107 is provided at the bottom of the reaction barrel 101, and a pressure gauge PG is provided on the reaction barrel 101;

[0043] like Figure 2 、 Figure 1 As shown, the ammonia water inlet 112 is connected to the softened water pipeline 114 through the ammonia absorption pipe 113, and the ammonia absorption device 9 is set on the ammonia absorption pipe 113; the softened water pipeline 114 is connected to the softened water source 6 in the factory area, as shown in FIG. Figure 3 As shown, the softened water pipeline 114 is provided with a temperature gauge TG, a pressure gauge PG, a first pneumatic regulating valve 130, a first flow meter 131 and a first control valve 132;

[0044] like Figure 2 、 Figure 1 As shown, the lower end of the ammonia circulation pipe 7 is connected to the middle of the reaction barrel 101, and the upper end is connected to the ammonia absorber 9; the liquid ammonia or gaseous ammonia inlet 106 is connected to the liquid phase outlet 14 and the plant nitrogen source 5 respectively through the liquid ammonia or gaseous ammonia input pipe 105; specifically, as Figure 4 The liquid ammonia or gaseous ammonia input pipe 105 is connected to the liquid phase outlet 14 via a liquid ammonia line 17, and the liquid ammonia or gaseous ammonia input pipe 105 is connected to the plant nitrogen source 5 via a nitrogen line 18. This system supports both gaseous ammonia and liquid ammonia as input media, and can simultaneously support the input of both media. This system can automatically produce ammonia water, with multiple media selectivity.

[0045] like Figure 3 、 Figure 1 As shown, the liquid ammonia or gaseous ammonia input pipe 105 is provided with an unloading pump 3, a pressure gauge PG, a second pneumatic regulating valve 133, a second flow meter 134, a second control valve 135 and a pressure transmitter PT; the ammonia aqueous solution outlet 107 is connected to the storage tank 12 through an ammonia aqueous solution output pipeline 108, and the ammonia aqueous solution output pipeline 108 is provided with a concentration meter 110, a pressure gauge PG, a temperature gauge TG and a temperature transmitter TT;

[0046] like Figure 2As shown, the heat dissipation system includes a heat dissipation pipe 226, a water inlet pipe 121, and a water outlet pipe 120. Cooling water is provided in the heat dissipation pipe 226. The heat dissipation pipe 226 extends from the top of the reaction barrel 101 to the middle of the reaction barrel 101. The two ends of the heat dissipation pipe 226 are respectively connected to the water inlet pipe 121 and the water outlet pipe 120; a temperature gauge TG and a pressure gauge PG are provided on the water inlet pipe 121, and a temperature gauge TG is provided on the water outlet pipe 120.

[0047] The control system's signal input is connected to a pressure transmitter PT, a temperature transmitter TT, a concentration meter 110, a first flowmeter 131, and a second flowmeter 134. The control system's signal output is connected to a first pneumatic regulating valve 130, a first control valve 132, a second pneumatic regulating valve 133, and a second control valve 135. Specifically, the control system of this embodiment employs a distributed control system (DCS).

[0048] The present invention provides a liquid ammonia unloading system specifically designed for the lithium battery manufacturing industry. Combining an ammonia water preparation unit 8, an ammonia gas circulation pipe 7, an ammonia absorber 9, and a heat dissipation system 10, this system integrates liquid ammonia vaporization and ammonia water preparation within a single unit. This system features excellent absorption efficiency, high concentration production, and stable equipment. During the ammonia water preparation process, liquid ammonia is introduced through a liquid or gaseous ammonia inlet pipe 105. After flow regulation by a second control valve 135, it enters the shell-side space of the ammonia water preparation unit's reaction barrel 101 at a constant flow rate. Softened water is introduced through an ammonia water inlet 112. After flow regulation by a first control valve 132, it enters the shell-side space of the ammonia water preparation unit's reaction barrel 101 at a constant flow rate. The softened water is saline water. The liquid ammonia in the reaction barrel 101 absorbs high temperatures, removing heat from the saline and ammonia water, and gradually vaporizes to produce ammonia gas. The ammonia gas then flows through a connecting pipe into the elevated ammonia absorber 9, where it is uniformly mixed with the softened water flowing through a specific nozzle within the ammonia absorber 9's chamber and absorbed. The mixed ammonia water enters the ammonia water preparation tube and reaches the required ammonia water outlet mass concentration and required ammonia water outlet temperature after heat exchange and cooling. The specific nozzle can be a commonly used single-fluid nozzle.

[0049] Specifically, Figure 5 This is a structural schematic diagram of the ammonia absorber described in an embodiment of the present invention. The ammonia absorber 9 includes an inlet 201, an outlet 204, a single-fluid nozzle 202 and an intake pipe 203. The inlet 201 is connected to the softened water pipeline 114, the outlet 204 is connected to the ammonia water inlet 112, and the intake pipe 203 is connected to the ammonia circulation pipe 7.

[0050] It needs to be further explained that: the top of the reaction barrel 101 is connected to the softened water pipeline 114 through the ammonia water inlet 112, the ammonia absorption pipe 113, and the ammonia absorber 9, and the ammonia absorber 9 is connected to the middle part of the reaction barrel 101 through the ammonia circulation pipe 7; its function is to convert softened water into ammonia water through the ammonia absorber 9, and the ammonia water is sent into the reaction barrel 101 through the ammonia water inlet 112. At the same time, the liquid ammonia in the reaction barrel 101 absorbs high temperature, absorbs the heat of brine and ammonia water, and gradually vaporizes into ammonia gas; the ammonia gas enters the ammonia absorber 9 set at a high position through the ammonia circulation pipe 7, and a single-fluid nozzle is set in the ammonia absorber 9. In the cavity of the ammonia absorber 9, the ammonia is evenly mixed and absorbed with the softened water passing through the single-fluid nozzle.

[0051] The present invention provides a liquid ammonia unloading system specifically designed for the lithium battery manufacturing industry. The specific cooling process is as follows: The absorption of softened water and ammonia is an exothermic process. The released heat of solution raises the temperature of the ammonia solution. This heat is used to vaporize the liquid ammonia in the inner shell of the reaction barrel 101. Because the heat of solution released during the absorption process is greater than the latent heat of vaporization of the liquid ammonia, the overall process is an exothermic reaction. To ensure the outlet temperature and concentration of the ammonia solution, the remaining heat is removed via the circulating cooling water of the heat dissipation system 10. This cooling process, through two-stage heat exchange with softened water and cooling water, can reduce the outlet temperature of the ammonia solution to 25-28°C.

[0052] The working principle of the liquid ammonia unloading system specially used in the lithium battery manufacturing industry of the present invention is: through direct heat exchange between low-temperature liquid ammonia and high-temperature ammonia water, the need for circulating water as a heat exchange intermediate medium in traditional process heat exchangers is eliminated, the heat transfer driving force is improved, the heat exchange efficiency is greatly improved, and the heat exchange area is reduced; the system layout is compact, the floor space is small, the process flow is simple, the circulating water consumption is small, the operation is easy, and the adjustable space is large.

[0053] like Figure 2 As shown, the ammonia water preparation device also includes a liquid level meter 123, which is arranged below the middle of the reaction barrel 101 and is used to measure the amount of liquid ammonia in the reaction barrel 101. The liquid level meter 123 is connected to the control system. The liquid level data collected by the liquid level meter 123 can be used to adjust the input amount of liquid ammonia.

[0054] like Figure 2 As shown, the ammonia solution preparation device further includes an exhaust pipe 116, one end of which is connected to the top of the reaction barrel 101 and the other end is connected to the first ammonia absorption tank 11. The exhaust pipe 116 is provided with an exhaust manual valve 104 and a safety exhaust valve 103. Specifically, one end of the exhaust pipe 116 is connected to the top of the reaction barrel 101, and the other end is connected to the first ammonia absorption tank 11 via an exhaust absorption pipe 118. By opening the exhaust manual valve 104 and the safety exhaust valve 103, overpressure gas is discharged to the absorption tank 11, thereby improving safety.

[0055] like Figure 2As shown, the ammonia water preparation device further includes a drain pipe 122 for connecting to the wastewater tank, and the drain pipe 122 is respectively connected to the middle of the reaction barrel 101, the lower part of the reaction barrel 101 and the ammonia water output pipeline 108. The drain pipe 122 can be used to discharge the remaining liquid ammonia or ammonia water.

[0056] like Figure 2 As shown, the ammonia circulation pipe 7 is provided with a one-way valve 102, a temperature gauge TG, an exhaust manual valve 104, and a safety exhaust valve 103. The ammonia circulation pipe 7 forms a one-way circulation channel, and the exhaust manual valve 104 and the safety exhaust valve 103 are provided to remove overpressure gas and improve safety.

[0057] like Figure 3 As shown, the softened water pipeline 114, the liquid or gaseous ammonia input pipe 105, and the ammonia output pipe 108 are respectively provided with parallel conducting pipes 109, and a manual valve is provided on the conducting pipe 109. The system provides conducting branches to facilitate maintenance in the operating state.

[0058] The system also includes a leakage alarm 2, a manual shut-off valve 15, and an emergency shut-off valve 16. The leakage alarm 2 includes multiple devices, each located near the liquid ammonia unloading arm 13, the unloading pump 3, and the liquid or gaseous ammonia inlet pipe 105. The manual shut-off valve 15 and the emergency shut-off valve 16 are located at the liquid phase outlet 14 and the gaseous ammonia return pipe 21, respectively. In the event of a leak, the pipeline is shut off immediately, reducing the risk of ammonia leakage and providing fire protection.

[0059] like Figure 1 As shown, the liquid ammonia unloading arm 13 is also provided with a gaseous ammonia inlet 20, which is connected to the unloading pump 3 via a gaseous ammonia return pipe 21. The gaseous ammonia return pipe 21 and the liquid ammonia or gaseous ammonia inlet pipe 105 are respectively connected to the second ammonia absorption tank 4 via a gas diffusion pipe 19. The gas diffusion pipe 19 is provided with a manual valve DN. The gaseous ammonia return pipe 21 can increase the pressure of the tank truck, and the ammonia is absorbed by the second ammonia absorption tank 4 to prevent leakage.

[0060] The present invention also provides a control method for a liquid ammonia unloading system dedicated to the lithium battery manufacturing industry, comprising the following steps:

[0061] S1 obtains the concentration data collected by the concentration meter 110, obtains the flow data collected by the first flow meter 131 and the second flow meter 134;

[0062] S2. Sending instructions to the first pneumatic control valve 130 and / or the second pneumatic control valve 133 according to the concentration data and the flow data.

[0063] As a preferred solution of this embodiment, the following steps are also included:

[0064] S3 obtains pressure data collected by the pressure transmitter PT and temperature data collected by the temperature transmitter TT;

[0065] S4. Send instructions to the first pneumatic control valve 130 and / or the second pneumatic control valve 133 according to the pressure data and the temperature data.

[0066] The present invention provides a control method for a liquid ammonia unloading system specifically designed for the lithium battery manufacturing industry. According to the above steps, the control system can, based on data collected by the pressure transmitter PT, temperature transmitter TT, concentration meter 110, first flowmeter 131, and second flowmeter 134, control the influent ratio of liquid ammonia to softened water by adjusting the first pneumatic regulating valve 130, first control valve 132, second pneumatic regulating valve 133, and second control valve 135 to achieve control of the mixed concentration of the ammonia solution, thereby stabilizing the ammonia solution concentration within a desired range. Furthermore, by adjusting the first control valve 132 and second control valve 135, the influent amounts of liquid ammonia and softened water can be controlled to control the amount of ammonia solution synthesized. In this embodiment, an ammonia concentration meter and temperature transmitter TT or platinum resistance thermometer are preferably provided at the outlet of the ammonia solution preparation device, and the data are remotely transmitted to the control system for remote monitoring, display, and fine-tuning.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A liquid ammonia unloading system for lithium battery manufacturing, comprising a control system, a liquid ammonia unloading arm (13) and an unloading pump (3), wherein a liquid phase outlet (14) is provided on the liquid ammonia unloading arm (13); characterized in that: It also includes an ammonia water preparation device (8), an ammonia circulation pipe (7), an ammonia absorber (9) and a heat dissipation system (10); the ammonia water preparation device includes a reaction barrel (101), the reaction barrel (101) is cylindrical and its long axis is arranged in the vertical direction, an ammonia water inlet (112) is arranged at the top of the reaction barrel (101), a liquid ammonia or gaseous ammonia inlet (106) is arranged at the bottom of the reaction barrel (101), an ammonia water outlet (107) is arranged at the bottom of the reaction barrel (101), and a pressure gauge is arranged on the reaction barrel (101); The ammonia water inlet (112) is connected to the softened water pipeline (114) via the ammonia absorption pipe (113), and the ammonia absorption pipe (113) is provided with an ammonia absorber (9); the softened water pipeline (114) is connected to the softened water source (6) in the factory area, and the softened water pipeline (114) is provided with a temperature gauge, a pressure gauge, a first pneumatic regulating valve (130), a first flow meter (131) and a first control valve (132); The lower end of the ammonia circulation pipe (7) is connected to the middle of the reaction barrel (101), and the upper end is connected to the ammonia absorber (9); the liquid ammonia or gaseous ammonia inlet (106) is connected to the liquid phase outlet (14) and the plant nitrogen source (5) respectively through the liquid ammonia or gaseous ammonia input pipe (105); the ammonia circulation pipe (7) is provided with a one-way valve (102), a temperature gauge, an exhaust manual valve (104) and a safety exhaust valve (103); The liquid ammonia or gaseous ammonia input pipe (105) is provided with an unloading pump (3), a pressure gauge, a second pneumatic regulating valve (133), a second flow meter (134), a second control valve (135) and a pressure transmitter; the ammonia water outlet (107) is connected to the storage tank (12) via an ammonia water output pipe (108); the ammonia water output pipe (108) is provided with a concentration meter (110), a pressure gauge, a temperature gauge and a temperature transmitter; The heat dissipation system comprises a heat dissipation pipe (226), a water inlet pipe (121) and a water outlet pipe (120); cooling water is provided in the heat dissipation pipe (226); the heat dissipation pipe (226) extends from the top of the reaction barrel (101) to the middle of the reaction barrel (101); both ends of the heat dissipation pipe (226) are respectively connected to the water inlet pipe (121) and the water outlet pipe (120); a temperature gauge and a pressure gauge are provided on the water inlet pipe (121); and a temperature gauge is provided on the water outlet pipe (120); The signal input end of the control system is connected to the pressure transmitter, the temperature transmitter, the concentration meter (110), the first flow meter (131), and the second flow meter (134); the signal output end of the control system is connected to the first pneumatic regulating valve (130), the first control valve (132), the second pneumatic regulating valve (133), and the second control valve (135); The liquid ammonia unloading arm (13) is also provided with an ammonia gas inlet (20), which is connected to the unloading pump (3) via an ammonia gas return pipe (21). The ammonia gas return pipe (21) and the liquid ammonia or ammonia gas input pipe (105) are respectively connected to the second ammonia absorption tank (4) via an air diffusion pipe (19), and a hand valve is provided on the air diffusion pipe (19).

2. The liquid ammonia unloading system for lithium battery manufacturing according to claim 1 is characterized in that: The ammonia water preparation device further comprises a liquid level meter (123), which is arranged below the middle of the reaction barrel (101) and is used to measure the amount of liquid ammonia in the reaction barrel (101). The liquid level meter (123) is connected to the control system.

3. The liquid ammonia unloading system for lithium battery manufacturing according to claim 1 is characterized in that: The ammonia water preparation device further comprises an exhaust pipe (116), one end of the exhaust pipe (116) is connected to the top of the reaction barrel (101), and the other end is connected to the first ammonia absorption tank (11), and an exhaust manual valve (104) and a safety exhaust valve (103) are provided on the exhaust pipe (116).

4. The liquid ammonia unloading system for lithium battery manufacturing according to claim 1 is characterized in that: The ammonia water preparation device further includes a sewage pipe (122) for connecting to a wastewater tank, wherein the sewage pipe (122) is connected to the middle of the reaction barrel (101), the lower part of the reaction barrel (101) and the ammonia water output pipeline (108).

5. The liquid ammonia unloading system for lithium battery manufacturing industry according to claim 1 is characterized in that: The softened water pipeline (114), the liquid ammonia or gaseous ammonia input pipeline (105) and the ammonia water output pipeline (108) are respectively provided with parallel conducting pipes (109), and a manual valve is provided on the conducting pipes (109).

6. The liquid ammonia unloading system for lithium battery manufacturing according to claim 1 is characterized in that: It also includes a leakage alarm (2), a shut-off manual valve (15) and an emergency shut-off valve (16). The leakage alarm (2) includes a plurality of devices, which are respectively arranged near the liquid ammonia unloading arm (13), the unloading pump (3) and the liquid ammonia or gaseous ammonia input pipe (105). The shut-off manual valve (15) and the emergency shut-off valve (16) are respectively arranged at the liquid phase outlet (14) and the gaseous ammonia return pipe (21).

7. The control method of the liquid ammonia unloading system for lithium battery manufacturing industry according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Acquire concentration data collected by the concentration meter (110), and acquire flow data collected by the first flow meter (131) and the second flow meter (134); S2. Sending instructions to the first pneumatic regulating valve (130) and the second pneumatic regulating valve (133) based on the concentration data and the flow data.

8. The control method of the liquid ammonia unloading system for lithium battery manufacturing industry according to claim 7 is characterized in that: The following steps are also included: S3. Obtain pressure data collected by the pressure transmitter and temperature data collected by the temperature transmitter; S4. Sending instructions to the first pneumatic regulating valve (130) and the second pneumatic regulating valve (133) based on the pressure data and the temperature data.

Images