MVR evaporator for processing lithium carbonate positive electrode material

Abstract

The utility model relates to the technical field of lithium carbonate positive electrode material processing, in particular to an MVR (mechanical vapor recompression) evaporator for lithium carbonate positive electrode material processing. The MVR evaporator for processing the lithium carbonate positive electrode material comprises a heat insulation barrel, a discharging pipe, an electromagnetic valve I, an evaporation chamber and a connecting pipe I. The bottom in the heat insulation barrel is connected with the discharging pipe extending outwards, the electromagnetic valve I is installed at the upper end of the discharging pipe, the evaporation chamber is fixedly connected to the lower portion in the heat insulation barrel, and the right side of the upper portion of the evaporation chamber is connected with the connecting pipe I. By arranging the purification mechanism, steam is discharged into a spraying bin, a water pump operates to pump an oxidizing agent in a liquid storage box into a connecting pipe III, then the oxidizing agent is conveyed into a double-end pipe and sprayed into the spraying bin from two spraying heads to spray steam, steam purification is achieved, harmful substances of gas in the steam are removed, and the evaporator has the purification function; the problem that waste heat gas cannot be used immediately due to the fact that the waste heat gas needs to be treated additionally is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium carbonate cathode material processing, in particular to an MVR evaporator for lithium carbonate cathode material processing. Background Art

[0002] Lithium carbonate cathode materials generally refer to materials used as positive electrode active substances in lithium-ion batteries or lithium metal batteries. However, it is not directly used as a cathode material itself, but participates in the preparation process of the cathode material as one of the raw materials. In the processing of lithium carbonate cathode materials, the use of an MVR evaporator is mainly to remove moisture from the lithium carbonate solution, concentrate the lithium carbonate solution, and improve the purity of the lithium carbonate solution.

[0003] Currently, the steps of concentrating lithium carbonate solution using an MVR evaporator are as follows: First, the preheated lithium carbonate solution is fed into the evaporation chamber of the MVR evaporator. The MVR evaporator heats the solution to promote the evaporation of water, thereby starting to concentrate the lithium carbonate solution. The steam generated during the heating process is guided to an external steam separator for preliminary gas-liquid separation to ensure that there are no liquid droplets in the steam. The steam after preliminary separation is extracted and compressed by an external compressor to increase its temperature and pressure, and then sent back to the evaporation chamber of the MVR evaporator as a heating source to participate in the evaporation process again. After the concentrated lithium carbonate solution reaches the predetermined concentration, it is directly discharged from the evaporator and enters the subsequent processing link. However, during the process of steam recycling, the finally discharged gas still carries a certain amount of heat. This part of the waste heat gas can be collected in the factory and used for preheating systems or other heat energy requirements to achieve multi-level utilization of energy. However, the waste heat gas may contain harmful substances and does not meet the requirements of environmental protection regulations, so additional treatment of the waste heat gas is required, resulting in the waste heat gas not being immediately usable.

[0004] Therefore, there is a particular need for an MVR evaporator for lithium carbonate cathode material processing to solve the problems existing in the prior art. Summary of the Utility Model

[0005] In order to overcome the disadvantages that the waste heat gas may contain harmful substances and does not meet the requirements of environmental protection regulations, and additional treatment of the waste heat gas is required, resulting in the waste heat gas not being immediately usable, the utility model provides an MVR evaporator for lithium carbonate cathode material processing.

[0006] The present utility model is achieved through the following technical means: an MVR evaporator for processing lithium carbonate cathode materials, which includes a heat insulation cylinder, a discharge pipe, solenoid valve I, an evaporation chamber, connecting pipe I, solenoid valve II, an air outlet, heating pipes, connecting pipe V, solenoid valve V, an air outlet pipe and solenoid valve III. The bottom inside the heat insulation cylinder is connected to an extended discharge pipe, and a solenoid valve I is installed at the upper end of the discharge pipe. The lower part inside the heat insulation cylinder is fixedly connected to an evaporation chamber. The upper right side of the evaporation chamber is connected to connecting pipe I, and connecting pipe I passes out of the heat insulation cylinder to the outside, and a solenoid valve II is installed at the left end. The top of the evaporation chamber is fixedly connected to an air outlet. The lower part inside the heat insulation cylinder is provided with heating pipes. The upper left side of the evaporation chamber is connected to connecting pipe V, and connecting pipe V passes out of the heat insulation cylinder to the outside, and a solenoid valve V is installed at the right end. The upper part of the heat insulation cylinder is connected to an air outlet pipe, and a solenoid valve III is connected to the lower end of the air outlet pipe. It further includes a purification mechanism, and a purification mechanism for purifying steam is arranged inside the heat insulation cylinder.

[0007] Furthermore, the purification mechanism includes a spray chamber, a double-headed pipe, spray nozzles, a liquid storage tank, a return pipe, a water pump, connecting pipe III, piston I and piston II. The upper part inside the heat insulation cylinder is fixedly connected to a spray chamber, and the end of the air outlet pipe is connected to the top of the spray chamber. The upper part of the heat insulation cylinder is connected to a double-headed pipe. Two spray nozzles are connected to the left end of the double-headed pipe, and the spray nozzles are communicated with the spray chamber. A liquid storage tank is connected to the outside of connecting pipe I, a return pipe is connected between the liquid storage tank and the spray chamber, a water pump is installed on the right side of the liquid storage tank, the right end of the double-headed pipe is connected to the right side of the water pump, and connecting pipe III is connected to the left side of the water pump. Connecting pipe III is located inside the liquid storage tank. Piston I for sealing is plugged at the upper part of the liquid storage tank, and piston II for sealing is plugged at the lower part of the liquid storage tank.

[0008] Furthermore, it further includes a filtering mechanism. A filtering mechanism for initially purifying steam is arranged in the middle part inside the heat insulation cylinder. The filtering mechanism includes a filtering chamber, connecting pipe II, activated carbon and a lifting plate. A filtering chamber is fixedly connected to the middle part inside the heat insulation cylinder. The filtering chamber is located between the spray chamber and the evaporation chamber. Connecting pipe II is fixedly connected between the filtering chamber and the spray chamber. Activated carbon is placed inside the filtering chamber. A lifting plate is slidably connected to the upper left side of the heat insulation cylinder.

[0009] Furthermore, both piston I and piston II are made of vacuum-sealed rubber material.

[0010] Furthermore, it further includes a controller. A controller is installed on the upper left side of the heat insulation cylinder. The controller is electrically connected to solenoid valve I, solenoid valve II, the heating pipes, solenoid valve III, the water pump and solenoid valve V.

[0011] Furthermore, the end of connecting pipe III is close to the bottom inside the liquid storage tank.

[0012] From the above description of the structure of the present utility model, the design starting point, concept and advantages of the present utility model are as follows: 1. By setting up a purification mechanism, steam is discharged into the spray chamber. The water pump operates to pump the oxidant in the liquid storage tank into the connecting pipe III, and then it is transported to the double-headed pipe and sprayed out from the two nozzles into the spray chamber to spray the steam, realizing the purification of the steam and removing the harmful substances in the gas in the steam, so that the evaporator has a self-purification function, effectively solving the problem that the waste heat gas needs to be additionally treated, resulting in the waste heat gas being unable to be used immediately.

[0013] 2. By setting up a filtering mechanism, the steam rises and is discharged from the air outlet into the filtering chamber. The steam is initially purified through activated carbon to achieve a better purification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a three-dimensional structural schematic diagram of the present utility model.

[0015] Figure 2 is a first partial sectional view of the present utility model.

[0016] Figure 3 is a second partial sectional view of the present utility model.

[0017] Figure 4 is a third partial sectional view of the present utility model.

[0018] The names of the reference numerals in the figure: 1. Heat insulation cylinder, 2. Solenoid valve I, 3. Discharge pipe, 4. Solenoid valve II, 5. Connecting pipe I, 6. Lifting plate, 7. Air outlet pipe, 8. Controller, 9. Evaporation chamber, 901. Air outlet, 10. Heating pipe, 11. Filtering chamber, 12. Activated carbon, 13. Connecting pipe II, 15. Spray chamber, 16. Solenoid valve III, 17. Nozzle, 18. Double-headed pipe, 19. Return pipe, 20. Liquid storage tank, 21. Water pump, 22. Connecting pipe III, 23. Piston I, 2301. Piston II, 24. Connecting pipe V, 25. Solenoid valve V. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following further illustrates the technical solution with specific embodiments. It should be noted that: The words indicating directions such as up, down, left, and right mentioned in this article are only in terms of the positions in the corresponding drawings of the shown structures. The serial numbers assigned to the components in this article itself, for example: first, second, etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the connections and couplings mentioned in this application, unless otherwise specified, all include direct and indirect connections.

[0020] Embodiment: An MVR evaporator for processing lithium carbonate cathode materials, refer to Figures 1-4As shown in the figure, it includes a heat insulation cylinder 1, a discharge pipe 3, a solenoid valve I 2, an evaporation chamber 9, a connecting pipe I 5, a solenoid valve II 4, an air outlet 901, a heating pipe 10, a connecting pipe V 24, a solenoid valve V 25, an air outlet pipe 7 and a solenoid valve III 16. The bottom inside the heat insulation cylinder 1 is connected to an extended discharge pipe 3. The upper end of the discharge pipe 3 is connected to the solenoid valve I 2 by bolts. The lower part inside the heat insulation cylinder 1 is connected to the evaporation chamber 9 by welding. The upper right side of the evaporation chamber 9 is connected to the connecting pipe I 5. The connecting pipe I 5 passes through to the outside of the heat insulation cylinder 1, and the left end is connected to the solenoid valve II 4 by bolts. The top of the evaporation chamber 9 is connected to the air outlet 901 by welding. The lower part inside the heat insulation cylinder 1 is connected to the heating pipe 10 by bolts. The heating pipe 10 is close to the inner wall of the heat insulation cylinder 1 and surrounds the evaporation chamber 9. The upper left side of the evaporation chamber 9 is connected to the connecting pipe V 24. The connecting pipe V 24 passes through to the outside of the heat insulation cylinder 1, and the right end is connected to the solenoid valve V 25 by bolts. The upper part of the heat insulation cylinder 1 is connected to the air outlet pipe 7. The lower end of the air outlet pipe 7 is connected to the solenoid valve III 16. It further includes a purification mechanism, and a purification mechanism for purifying the steam is arranged inside the heat insulation cylinder 1.

[0021] Refer to Figures 2-4 As shown in the figure, the purification mechanism includes a spray chamber 15, a double-headed pipe 18, a spray head 17, a liquid storage tank 20, a return pipe 19, a water pump 21, a connecting pipe III 22, a piston I 23 and a piston II 2301. The upper part inside the heat insulation cylinder 1 is connected to the spray chamber 15 by welding. The end of the air outlet pipe 7 is connected to the top of the spray chamber 15. The upper part of the heat insulation cylinder 1 is connected to the double-headed pipe 18. The left end of the double-headed pipe 18 is connected to two spray heads 17. The spray heads 17 are communicated with the spray chamber 15. The outside of the connecting pipe I 5 is connected to the liquid storage tank 20. A return pipe 19 is connected between the left side of the liquid storage tank 20 and the bottom of the spray chamber 15. The right side of the liquid storage tank 20 is connected to the water pump 21 by bolts. The right end of the double-headed pipe 18 is connected to the right side of the water pump 21. The left side of the water pump 21 is connected to the connecting pipe III 22. The connecting pipe III 22 is located inside the liquid storage tank 20 and the end is close to the inner bottom of the liquid storage tank 20. The upper part of the liquid storage tank 20 is plugged with a piston I 23 for sealing. The lower part of the liquid storage tank 20 is plugged with a piston II 2301 for sealing. Both the piston I 23 and the piston II 2301 are made of vacuum-sealed rubber material, having a relatively slow compressive stress and being able to achieve a good sealing effect. By operating the water pump 21, the oxidant inside the liquid storage tank 20 is pumped into the connecting pipe III 22 and then conveyed to the inside of the double-headed pipe 18 and sprayed out from the spray heads 17 into the spray chamber 15.

[0022] Refer to Figure 1 and Figure 2As shown in the figure, it further includes a filtering mechanism. A filtering mechanism for the primary purification of steam is provided in the middle of the heat insulation cylinder 1. The filtering mechanism includes a filtering chamber 11, a connecting pipe II 13, activated carbon 12, and a lifting plate 6. The filtering chamber 11 is connected to the middle of the heat insulation cylinder 1 by welding. The filtering chamber 11 is located between the spraying chamber 15 and the evaporation chamber 9. A connecting pipe II 13 is connected between the top of the filtering chamber 11 and the left middle part of the spraying chamber 15 by welding. Activated carbon 12 is placed inside the filtering chamber 11. The bottom surface of the activated carbon 12 is in contact with the top surface of the air outlet 901. A lifting plate 6 is slidably connected to the upper left side of the heat insulation cylinder 1.

[0023] Refer to Figure 1 As shown in the figure, it further includes a controller 8. The controller 8 is connected to the solenoid valve I 2, solenoid valve II 4, heating pipe 10, solenoid valve III 16, water pump 21, and solenoid valve V 25 by bolts.

[0024] First, the staff member pulls out the piston I 23 to open the liquid storage tank 20, pours the oxidant into the liquid storage tank 20, plugs the piston I 23 back after pouring to close the liquid storage tank 20. Subsequently, connect the pipeline of the compressor to the connecting pipe V 24, control the solenoid valve V 25 to open the connecting pipe V 24 through the controller 8, then connect the external delivery pipe to the connecting pipe I 5, and transport the lithium carbonate solution into the connecting pipe I 5. Then, control the solenoid valve II 4 to open the connecting pipe I 5, so that the lithium carbonate solution in the connecting pipe I 5 flows into the evaporation chamber 9. After an appropriate amount of lithium carbonate solution flows in, control the solenoid valve II 4 to close the connecting pipe I 5 to stop transporting the lithium carbonate solution. Then, turn on the heating pipe 10 and the water pump 21. The heating pipe 10 operates to heat the lithium carbonate solution in the evaporation chamber 9, promoting the concentration of the lithium carbonate solution. During the heating process, steam will be generated in the evaporation chamber 9, and the steam rises and is discharged from the air outlet 901 into the filtration chamber 11. The steam is initially purified by the activated carbon 12, and the purified steam is discharged into the spray chamber 15 through the connecting pipe II 13. At this time, the water pump 21 operates to pump the oxidant in the liquid storage tank 20 into the connecting pipe III 22, and then transports it to the double-headed pipe 18 and sprays it from the two nozzles 17 into the spray chamber 15 to spray the steam, realizing the secondary purification of the steam and removing the harmful substances in the gas in the steam. The purified steam is discharged from the outlet pipe 7 into the separator for gas-liquid separation. The separated dry gas is sent back to the evaporation chamber 9 by the compressor through the connecting pipe V 24 to participate in the recycling. During the spraying process, the oxidant in the spray chamber 15 flows back into the liquid storage tank 20 through the return pipe 19, realizing the recycling of the oxidant. When the lithium carbonate solution is concentrated to the predetermined concentration, turn off the heating pipe 10, then control the solenoid valve I 2 to open the discharge pipe 3, so that the concentrated lithium carbonate solution is discharged from the discharge pipe 3. After the discharge is completed, control the solenoid valve I 2 to close the discharge pipe 3. Wait for a period of time to ensure that the gas in the spray chamber 15 is completely purified and discharged, then turn off the water pump 21. Finally, control the solenoid valve III 16 and the solenoid valve V 25 to close the outlet pipe 7 and the connecting pipe V 24 respectively. When it is necessary to replace the activated carbon 12, pull up the lifting plate 6 to open the heat insulation cylinder 1, directly take out the old activated carbon 12, replace it with a new one, and push down the lifting plate 6 to reset and close the heat insulation cylinder 1. When it is necessary to clean the liquid storage tank 20, simultaneously move the piston I 23 and the piston II 2301, then inject clean water into the liquid storage tank 20 for cleaning. The used clean water is discharged from the lower right side of the liquid storage tank 20. After cleaning, plug the piston I 23 and the piston II 2301 back.

[0025] The above has introduced the present application in detail. Specific examples are used in this text to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. An MVR evaporator for processing lithium carbonate positive electrode materials, comprising an insulation tube (1), a discharge pipe (3), a solenoid valve I (2), an evaporation chamber (9), a connecting pipe I (5), a solenoid valve II (4), an air outlet (901), a heating pipe (10), a connecting pipe V (24), a solenoid valve V (25), an air outlet pipe (7) and a solenoid valve III (16), wherein the bottom of the insulation tube (1) is connected to an outwardly extending discharge pipe (3), the upper end of the discharge pipe (3) is equipped with a solenoid valve I (2), the lower part of the insulation tube (1) is fixedly connected to an evaporation chamber (9), and the upper part of the evaporation chamber (9) is The right side is connected with a connecting pipe I (5), the connecting pipe I (5) passes through to the outside of the insulation tube (1), and a solenoid valve II (4) is installed at the left end. The top of the evaporation chamber (9) is fixedly connected with an air outlet (901), a heating pipe (10) is installed in the lower part of the insulation tube (1), the upper left side of the evaporation chamber (9) is connected with a connecting pipe V (24), the connecting pipe V (24) passes through to the outside of the insulation tube (1), and a solenoid valve V (25) is installed at the right end. The upper part of the insulation tube (1) is connected with an air outlet pipe (7), and the lower end of the air outlet pipe (7) is connected with a solenoid valve III (16), characterized in that: It also includes a purification mechanism, and the heat-insulating cylinder (1) is provided with a purification mechanism for purifying steam.

2. The MVR evaporator for processing lithium carbonate positive electrode materials according to claim 1, characterized in that: The purification mechanism comprises a spray chamber (15), a double-headed pipe (18), a nozzle (17), a liquid storage tank (20), a return pipe (19), a water pump (21), a connecting pipe III (22), a piston I (23) and a piston II (2301); the spray chamber (15) is fixedly connected to the upper inner part of the heat-insulating cylinder (1); the air outlet pipe (7) is connected to the spray chamber (15); the upper part of the heat-insulating cylinder (1) is connected to the double-headed pipe (18); the left end of the double-headed pipe (18) is connected to two nozzles (17); the nozzles (17) are connected to the spray chamber (15) The connecting pipe I (5) is externally connected to a liquid storage tank (20), a return pipe (19) is connected between the liquid storage tank (20) and the spray chamber (15), a water pump (21) is installed on the right side of the liquid storage tank (20), the double-headed pipe (18) is connected to the water pump (21), the left side of the water pump (21) is connected to a connecting pipe III (22), the connecting pipe III (22) is located inside the liquid storage tank (20), the upper part of the liquid storage tank (20) is plugged with a piston I (23) for sealing, and the lower part of the liquid storage tank (20) is plugged with a piston II (2301) for sealing.

3. The MVR evaporator for processing lithium carbonate positive electrode materials according to claim 2, characterized in that: The invention also comprises a filtering mechanism. The filtering mechanism for initially purifying steam is arranged in the middle of the heat-insulating cylinder (1). The filtering mechanism comprises a filtering chamber (11), a connecting pipe II (13), activated carbon (12) and a lifting plate (6). The filtering chamber (11) is fixedly connected in the middle of the heat-insulating cylinder (1). The filtering chamber (11) is located between the spray chamber (15) and the evaporation chamber (9). A connecting pipe II (13) is fixedly connected between the filtering chamber (11) and the spray chamber (15). Activated carbon (12) is placed in the filtering chamber (11). The lifting plate (6) is slidably connected to the left side of the upper part of the heat-insulating cylinder (1).

4. The MVR evaporator for processing lithium carbonate positive electrode material according to claim 3, characterized in that: Piston Ⅰ (23) and piston Ⅱ (2301) are both made of vacuum sealing rubber.

5. The MVR evaporator for processing lithium carbonate positive electrode material according to claim 4, characterized in that: The invention also comprises a controller (8), which is installed on the left side of the upper part of the heat-insulating cylinder (1), and the controller (8) is electrically connected to the electromagnetic valve I (2), the electromagnetic valve II (4), the heating pipe (10), the electromagnetic valve III (16), the water pump (21) and the electromagnetic valve V (25).

6. The MVR evaporator for processing lithium carbonate positive electrode material according to claim 5, characterized in that: The end of the connecting pipe III (22) is close to the bottom of the liquid storage tank (20).

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