Lithium battery recovery tail gas treatment equipment suitable for defluorination dual-alkali process
By using jet plates and conductivity sensors to control the lye circulation in the lithium battery recycling exhaust treatment equipment, the frequent replacement of lye caused by NaF saturation is solved, and the continuity and efficiency of the alkali washing process are achieved.
Patent Information
- Application Number
- CN202422157287.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-03
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-09-03
AI Technical Summary
In the defluorinated double alkali process, the saturation solubility of NaF is about 4%, which causes the alkaline liquid to be replaced regularly, affecting the treatment efficiency. In the prior art, the alkaline washing process is interrupted.
A lithium battery recycling exhaust treatment equipment is designed, including an alkaline washing tower and a flip piece. The lye liquid circulation is controlled by using a jet plate and a conductivity sensor. The lye liquid is guided to the liquid storage area through the jet plate, and the solubility is detected by using a conductivity sensor. The flip piece is triggered to drive the jet plate to change the flow direction of the lye liquid, so as to achieve the renewal of the lye liquid without interrupting the alkaline washing process.
The continuous renewal of the alkali liquid is achieved, and the efficient alkali washing process is maintained, avoiding the reduction in the treatment efficiency caused by the saturation of the alkali liquid.
Smart Images
Figure CN223082570U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of lithium battery recycling, and more specifically, to a lithium battery recycling tail gas treatment device suitable for the defluorination double-alkali process. Background Art
[0002] When recycling and treating waste lithium batteries, harmful gases such as HF will be generated. HF is greatly affected by temperature and will volatilize again when dissolved in water, so it needs to be harmlessly treated before being discharged. In the defluorination double-alkali process, NaOH is needed to absorb it to form stable NaF. This process uses multiple alkali scrubbing towers. After HF reacts with the alkali solution to form NaF, the alkali solution containing NaF will be pumped back to the top of the tower for spraying again to realize the alkali solution circulation and improve the absorption rate of the alkali solution. However, the saturated solubility of NaF is about 4% or so. When this solubility is reached, salts will precipitate, resulting in a decrease in the absorption rate. Therefore, the alkali solution in the tower needs to be replaced regularly, thus interrupting the alkali scrubbing process and affecting the treatment efficiency. Summary of the Utility Model
[0003] To make up for the above deficiencies, the present application provides a lithium battery recycling tail gas treatment device suitable for the defluorination double-alkali process, aiming to improve the problems mentioned in the above background art.
[0004] An embodiment of the present application provides a lithium battery recycling tail gas treatment device suitable for the defluorination double-alkali process, including an alkali scrubbing tower and a flipping member. There are two liquid storage areas provided at the lower part of the alkali scrubbing tower. A circulation mechanism is arranged in the alkali scrubbing tower and is communicated with the two liquid storage areas. Each liquid storage area is provided with a liquid discharge port and a conductivity sensor, and a solenoid valve is arranged on the liquid discharge port. A hollow jet plate is hinged in the alkali scrubbing tower, and air ports are arrayed on the jet plate. The flipping member drives the jet plate to tilt towards the two liquid storage areas respectively.
[0005] In a specific implementation, the alkali scrubbing tower includes a tower body, a spray pipe and a filler. An air outlet is opened at the upper end of the tower body, the spray pipe is arranged below the air outlet, and the filler is arranged below the spray pipe.
[0006] In the above implementation process, the alkali solution is sprayed into the interior of the tower body through the spray pipe and falls on the filler to increase the contact area with the HF gas and promote the absorption of HF by the alkali solution.
[0007] In a specific implementation, the circulation mechanism includes a pump body and a reversing valve. The outlet of the pump body is communicated with the spray pipe, and the inlet of the pump body is respectively communicated with the two liquid storage areas and an alkali solution supplement device through the reversing valve.
[0008] In the above implementation process, the two liquid storage areas are set as Area A and Area B. At the beginning, there is no lye in Area A. The reversing valve first switches to the lye replenishing device, and the new lye is pumped into the spray pipe through the pump body. The sprayed lye is guided to Area A through the jet plate until a certain amount of lye is stored in Area A. Then the reversing valve connects Area A with the pump body, so that the lye in Area A will circulate in the tower body. When the conductivity sensor detects that the solubility in Area A is close to 4% (which can be set to 3%), the reversing valve switches to the lye replenishing device again, and the sprayed lye is guided to Area B through the jet plate. The lye in Area B begins to accumulate and then starts to circulate. At this time, the solenoid valve in Area A can be opened to drain the lye with too high solubility, and so on in a cycle.
[0009] In a specific embodiment, the alkali washing tower further includes a guiding plate, which is arranged below the packing, and through grooves adapted to the jet plate are formed on the guiding plate.
[0010] In a specific embodiment, baffles are arranged on both sides of the jet plate.
[0011] In the above implementation process, the falling lye flows onto the jet plate through the guiding plate, and then enters the designated liquid storage area under the guidance of the baffle. The arrangements of the guiding plate and the baffle can effectively reduce the lye from falling into another liquid storage area.
[0012] In a specific embodiment, the air ports on the jet plate protrude from the surface of the jet plate.
[0013] In the above implementation process, when the lye flows on the jet plate, it can be prevented from entering the interior of the jet plate through the air ports. If the naturally falling lye water droplets directly fall on the air ports, they will also be blown to one side due to the air pressure, thus preventing the lye from entering the jet plate. After being blown, the water droplets will also be dispersed, thereby increasing the contact area with the gas. It should be noted that the gas is pressurized due to the limitation of the air ports to prevent the lye from entering. When the gas completely enters the tower body, it slows down due to the increase in space, thereby increasing the contact time with the lye. In another embodiment, when the air ports are arranged downward, the lye can be completely prevented from entering, but the function of dispersing the water droplets is lost.
[0014] In a specific embodiment, the flipping member includes a rotating pipe and a hydraulic cylinder. The rotating pipe is fixedly connected with the jet plate, the rotating pipe is rotatably connected with the tower body, and both ends of the hydraulic cylinder are hinged with the tower body and the rotating pipe respectively.
[0015] In a specific embodiment, a joint is rotatably connected to the rotating pipe, and the joint is fixedly connected with the tower body.
[0016] In the above implementation process, the hydraulic cylinder is used to push the rotating pipe joint to communicate with the recycling equipment, and is used to receive the tail gas. The tail gas enters the rotating pipe through the joint and then enters the jet plate. In this embodiment, the joint is sleeved on the rotating pipe, and a sealing ring is also arranged between the two. In this way, the rotating pipe can rotate in the joint while maintaining airtightness, which is also convenient for connecting the joint with the external recycling equipment.
[0017] Compared with the prior art, the beneficial effects of this application are as follows: The jet plate is used to guide the alkali solution sprayed in the alkali washing tower to one of the liquid storage areas, and the conductivity sensor is used to detect whether the solubility is close to saturation, so as to trigger the flipping member to drive the jet plate to guide the sprayed alkali solution to the other liquid storage area. In this way, the solenoid valve in the original liquid storage area is opened to discharge the saturated alkali solution, so that the alkali solution can be updated and the alkali washing process is not interrupted. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions of the embodiments of this application, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.
[0019] Figure 1 is a schematic diagram of a lithium battery recycling tail gas treatment device applicable to the defluorination dual-alkali process provided by the embodiment of this application;
[0020] Figure 2 is a schematic diagram of the connection relationship between the alkali washing tower and the circulation mechanism provided by the embodiment of this application;
[0021] Figure 3 provided by the embodiment of this application Figure 2 partial enlarged schematic diagram at A in;
[0022] Figure 4 is a schematic diagram of the connection relationship between the jet plate and the tower body provided by the embodiment of this application.
[0023] In the figure: 10 - alkali washing tower; 11 - tower body; 12 - spray pipe; 13 - packing; 14 - guiding plate; 20 - flipping member; 21 - rotating pipe; 22 - hydraulic cylinder; 23 - joint; 30 - circulation mechanism; 31 - pump body; 32 - reversing valve; 40 - conductivity sensor; 50 - solenoid valve; 60 - jet plate. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0024] The technical solutions in the embodiments of this application will be described below with reference to the drawings in the embodiments of this application.
[0025] Please refer to Figures 1-4, this application provides a lithium battery recycling tail gas treatment device applicable to the defluorination double-alkali process, including an alkali scrubbing tower 10 and a flipping member 20. There are two liquid storage areas provided at the lower part of the alkali scrubbing tower 10. A circulation mechanism 30 is arranged in the alkali scrubbing tower 10 and communicated with the two liquid storage areas. Each liquid storage area is provided with a liquid discharge port and a conductivity sensor 40. A solenoid valve 50 is arranged on the liquid discharge port. A hollow jet plate 60 is hinged in the alkali scrubbing tower 10. The jet plate 60 is arrayed with air ports. The flipping member 20 drives the jet plate 60 to tilt towards the two liquid storage areas respectively. Among them, the jet plate 60 is used to guide the alkali liquor sprayed in the alkali scrubbing tower 10 to one of the liquid storage areas, and the conductivity sensor 40 is used to detect whether the solubility is close to saturation, so as to trigger the flipping member 20 to drive the jet plate 60 to guide the sprayed alkali liquor to the other liquid storage area. In this way, the solenoid valve 50 of the original liquid storage area is opened to discharge the saturated alkali liquor, so that the alkali liquor can be kept updated and the alkali scrubbing process is not interrupted.
[0026] Please refer to Figures 1-4 , the alkali scrubbing tower 10 includes a tower body 11, a spray pipe 12 and a packing 13. An air outlet is opened at the upper end of the tower body 11. The spray pipe 12 is arranged below the air outlet. The packing 13 is arranged below the spray pipe 12. The alkali liquor is sprayed into the interior of the tower body 11 through the spray pipe 12 and falls on the packing 13 to increase the contact area with HF gas and promote the absorption of HF by the alkali liquor.
[0027] Please refer to Figures 1-4 , the circulation mechanism 30 includes a pump body 31 and a reversing valve 32. The outlet of the pump body 31 is communicated with the spray pipe 12. The inlet of the pump body 31 is respectively communicated with the two liquid storage areas and an alkali liquor replenishing device through the reversing valve 32. The two liquid storage areas are set as areas A and B. At the beginning, there is no alkali liquor in area A. The reversing valve 32 first switches to the alkali liquor replenishing device. The new alkali liquor is pumped into the spray pipe 12 through the pump body 31, and the sprayed alkali liquor is guided to area A through the guidance of the jet plate 60 until a certain amount of alkali liquor is stored in area A. Then the reversing valve 32 connects area A with the pump body 31 again. In this way, the alkali liquor in area A will circulate in the tower body 11. When the conductivity sensor 40 detects that the solubility in area A is close to 4% (which can be set to 3%), the reversing valve 32 switches to the alkali liquor replenishing device again, and the sprayed alkali liquor is guided to area B through the guidance of the jet plate 60. The alkali liquor in area B begins to accumulate and then starts to circulate. At this time, the solenoid valve 50 in area A can be opened to drain the alkali liquor with too high solubility, and so on in a cycle.
[0028] Please refer to Figures 1-4, the caustic scrubber 10 further includes a guiding plate 14 which is arranged below the packing 13. A through groove adapted to the jet plate 60 is formed on the guiding plate 14. Baffles are arranged on both sides of the jet plate 60. The falling caustic liquid flows onto the jet plate 60 through the guiding plate 14 and then enters the designated liquid storage area under the guidance of the baffles. The arrangements of the guiding plate 14 and the baffles can effectively prevent the caustic liquid from falling into another liquid storage area.
[0029] Please refer to Figures 1-4 , the air nozzles on the jet plate 60 protrude from the surface of the jet plate 60. When the caustic liquid flows on the jet plate 60, it can be prevented from entering the interior of the jet plate 60 through the air nozzles. If the natural falling caustic liquid drops directly land on the air nozzles, they will also be blown to one side due to the air pressure, thus preventing the caustic liquid from entering the jet plate 60. After being blown, the water drops will also be dispersed, thereby increasing the contact area with the gas. It should be noted that the gas is pressurized due to the restriction of the air nozzles to prevent the caustic liquid from entering. When the gas completely enters the tower body 11, it slows down due to the increase in space, thereby increasing the contact time with the caustic liquid. In another embodiment, the air nozzles are arranged downward, which can completely prevent the caustic liquid from entering, but the function of dispersing the water drops is lost.
[0030] Please refer to Figures 1-4 , the flipping member 20 includes a rotating pipe 21 and a hydraulic cylinder 22. The rotating pipe 21 is fixedly connected to the jet plate 60 and rotatably connected to the tower body 11. Both ends of the hydraulic cylinder 22 are hinged to the tower body 11 and the rotating pipe 21 respectively. A joint 23 is rotatably connected to the rotating pipe 21, and the joint 23 is fixedly connected to the tower body 11. The hydraulic cylinder 22 is used to push the rotating pipe 21 to connect the joint 23 with the recovery device for receiving the tail gas. The tail gas enters the rotating pipe 21 through the joint 23 and then enters the jet plate 60. In this embodiment, the joint 23 is sleeved on the rotating pipe 21, and a sealing ring is also arranged between them. In this way, the rotating pipe 21 can rotate within the joint 23 while maintaining airtightness, which is also convenient for connecting the joint 23 with an external recovery device.
[0031] The working principle of the lithium battery recycling tail gas treatment equipment applicable to the defluorinated double-alkali process is as follows: At the beginning, there is no alkali solution in the liquid storage area A. The reversing valve 32 first switches to the alkali solution replenishment equipment. The new alkali solution is pumped into the spray pipe 12 through the pump body 31 and reacts with the internal HF through adsorption. The alkali solution guides the sprayed alkali solution to area A through the guiding of the jet plate 60 until a certain amount of alkali solution is stored in area A. Then the reversing valve 32 connects area A with the pump body 31. In this way, the alkali solution in area A will circulate in the tower body 11. When the conductivity sensor 40 detects that the solubility in area A is close to 4% (which can be set to 3%), the reversing valve 32 switches to the alkali solution replenishment equipment again, and guides the sprayed alkali solution to area B through the guiding of the jet plate 60. The alkali solution in area B starts to accumulate and then starts to circulate. At this time, the solenoid valve 50 in area A can be opened to drain the alkali solution with too high solubility. Through such a cycle, in summary, the jet plate 60 is used to guide the sprayed alkali solution in the alkali washing tower 10 to one of the liquid storage areas, and the conductivity sensor 40 is used to detect whether the solubility is close to saturation, so as to trigger the flipping member 20 to drive the jet plate 60 to guide the sprayed alkali solution to the other liquid storage area. In this way, the solenoid valve 50 in the original liquid storage area is opened to drain the saturated alkali solution, so that the alkali solution can be kept updated and the alkali washing process is not interrupted.
[0032] The above are only embodiments of the present application and are not used to limit the protection scope of the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, improvement or equivalent replacement made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
Claims
1. A lithium battery recycling tail gas treatment device applicable to the defluorination double-alkali process, characterized in that, It includes an alkali washing tower (10) and a flipping member (20). There are two liquid storage areas provided at the lower part of the alkali washing tower (10). A circulation mechanism (30) is arranged in the alkali washing tower (10) and is communicated with the two liquid storage areas. Each liquid storage area is provided with a drain port and a conductivity sensor (40). A solenoid valve (50) is arranged on the drain port. A hollow air jet plate (60) is hinged in the alkali washing tower (10). Air ports are arrayed on the air jet plate (60). The flipping member (20) drives the air jet plate (60) to tilt towards the two liquid storage areas respectively.
2. The lithium battery recycling tail gas treatment equipment applicable to the defluorination double-alkali process according to claim 1, characterized in that, The alkali washing tower (10) includes a tower body (11), a spray pipe (12) and packing (13). An air outlet is opened at the upper end of the tower body (11). The spray pipe (12) is arranged below the air outlet. The packing (13) is arranged below the spray pipe (12).
3. The lithium battery recycling tail gas treatment equipment applicable to the defluorination double-alkali process according to claim 2, characterized in that, The circulation mechanism (30) includes a pump body (31) and a reversing valve (32). The outlet of the pump body (31) is communicated with the spray pipe (12). The inlet of the pump body (31) is respectively communicated with the two liquid storage areas and an alkali liquid replenishing device through the reversing valve (32).
4. The lithium battery recycling tail gas treatment equipment applicable to the defluorinated double-alkali process according to claim 3, wherein, The alkali washing tower (10) further includes a guiding plate (14). The guiding plate (14) is arranged below the packing (13). A through groove adapted to the air jet plate (60) is opened on the guiding plate (14).
5. The lithium battery recycling tail gas treatment equipment applicable to the defluorination double-alkali process according to claim 4, characterized in that, Baffles are arranged on both sides of the air jet plate (60).
6. The lithium battery recycling tail gas treatment equipment applicable to the defluorinated double-alkali process according to claim 5, wherein, The air ports on the air jet plate (60) protrude from the surface of the air jet plate (60).
7. The lithium battery recycling tail gas treatment equipment applicable to the defluorination double-alkali process according to claim 6, wherein, The flipping member (20) includes a rotating pipe (21) and a hydraulic cylinder (22). The rotating pipe (21) is fixedly connected with the air jet plate (60). The rotating pipe (21) is rotatably connected with the tower body (11). Both ends of the hydraulic cylinder (22) are respectively hinged with the tower body (11) and the rotating pipe (21).
8. The lithium battery recycling tail gas treatment equipment applicable to the defluorination double-alkali process according to claim 7, characterized in that, A joint (23) is rotatably connected to the rotating pipe (21). The joint (23) is fixedly connected with the tower body (11).