Lithium battery electrolyte tail gas absorption device and application method thereof

Abstract

The invention relates to the technical field of equipment and the technical field of electrolyte treatment, in particular to a lithium battery electrolyte tail gas absorption device and an application method thereof. The tail gas absorption device comprises a controller, a first-stage absorption bin, an alkali liquor storage cylinder and a second-stage absorption bin, the first-stage absorption bin is connected to the second-stage absorption bin through a first-stage exhaust pipe, and the alkali liquor storage cylinder is connected with the absorption bin through a liquid feeding pipeline. The first-stage absorption bin is provided with an air inlet pipe which extends into the bottom of the first-stage absorption bin and is provided with a bubble dispersing and releasing device; the first-stage exhaust pipe extends into the bottom in the second-stage absorption bin and is provided with a bubble dispersing and releasing device, and a second-stage exhaust pipe is arranged at the top end of the second-stage absorption bin. And a mechanical stirring device and a tail gas diffusion buffer plate are arranged in each absorption bin. The device adopts the mechanical stirring device and the tail gas diffusion buffer plate to shear and stop the tail gas from rising, increases the contact time and contact area of the tail gas and alkali liquor, and adopts secondary absorption treatment, multi-level detection and automatic control to improve the tail gas treatment effect.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment and the technical field of electrolyte treatment, and in particular to a lithium battery electrolyte tail gas absorption device and an application method thereof. Background Art

[0002] The tail gas treatment device is a device that purifies tail gas under the action of a catalyst, aiming to reduce pollution to the environment. Waste lithium batteries need to be treated in a timely manner after recycling. The electrolyte is easy to flow out during treatment and may adhere to the equipment or other objects, causing partial losses. The electrolyte contains organic solvents and lithium salts, such as LiPF6, which are easily converted into other substances when heated or in contact with water. The pyrolysis temperature of some electrolytes is relatively low, about 180°C. Toxic gases such as HF and LiF may be generated during the pyrolysis process, which pollutes the surrounding environment and poses a serious threat to human health and property safety. It is particularly important to handle electrolytes efficiently and safely.

[0003] The traditional electrolyte treatment structure is relatively complex, inconvenient to maintain, the exhaust gas treatment is incomplete, the degree of change in the pH value of the electrolyte treatment pool is difficult to detect, and the treated exhaust gas still cannot meet the environmental emission indicators. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a lithium battery electrolyte tail gas absorption device and its application method. The technical solution adopted is:

[0005] A lithium battery electrolyte tail gas absorption device, comprising a controller, a primary absorption chamber and a secondary absorption chamber, wherein the primary absorption chamber and the secondary absorption chamber are both fixed and supported by a base bracket, and the primary absorption chamber is connected to the secondary absorption chamber through a primary exhaust pipe;

[0006] An air inlet pipe is arranged at the middle and upper part of the side wall of the first-level absorption bin, and the part of the air inlet pipe extending into the first-level absorption bin includes a vertical section and a horizontal section. The first-level exhaust pipe is connected from the top of the first-level absorption bin to the top entrance of the side wall of the second-level absorption bin, and the part after entering the second-level absorption bin has the same shape as the air inlet pipe, including a vertical section and a horizontal section; each of the vertical sections passes downward into the bottom along the inner wall of the absorption bin, and each of the horizontal sections diffuses into a main pipe and at least two branch pipes distributed at the bottom of the absorption bin, and each branch pipe is provided with at least one bubble dispersion and release device; a secondary exhaust pipe is arranged at the top of the second-level absorption bin; 2 branch pipes, 3 branch pipes, four branch pipes, 5 branch pipes, etc. can be arranged on the main pipe, which are evenly dispersed at the bottom of the absorption bin, and 2, 3, 4, 5, 6, etc. bubble dispersion and release devices can be arranged on each branch pipe, and they are evenly arranged according to needs and the size of the absorption bin;

[0007] A mechanical stirring device is arranged in the center of the primary absorption bin and the secondary absorption bin. The tail gas absorption device has an air inlet and outlet pipe, a secondary exhaust pipe, and other connections are sealed.

[0008] Preferably, it also includes an alkali liquid storage cylinder, which is connected to the primary absorption bin and the secondary absorption bin through an upper liquid pipeline, and the side walls of the primary absorption bin and the secondary absorption bin are respectively provided with an inlet, and the inlet is located in the middle and upper part of the side walls of the primary absorption bin and the secondary absorption bin, and each upper liquid pipeline absorbs alkali liquid upward through an upper liquid pump, and each upper liquid pump is connected to and controlled by the controller. The alkali liquid storage cylinder is provided with an alkali liquid inlet, and the alkali liquid storage cylinder is used to store fresh alkali liquid, so as to timely replenish the insufficient alkali liquid in the primary absorption bin and the secondary absorption bin.

[0009] Preferably, at least one layer of exhaust gas diffusion buffer plate is installed in the first-level absorption bin and the second-level absorption bin, and the exhaust gas diffusion buffer plate is set in the alkaline solution; a horizontal fixed support plate is set on the inner wall of the first-level absorption bin and the second-level absorption bin, and the exhaust gas diffusion buffer plate is installed on the fixed support plate by screws, and the lowermost fixed support plate supports the horizontal section of the intake pipe and the first-level exhaust pipe; a plurality of air holes are evenly arranged on the exhaust gas diffusion buffer plate, and an opening is arranged in the center thereof.

[0010] Preferably, each of the mechanical stirring devices comprises a motor, a connecting shaft and a stirring paddle, each motor is arranged at the outer bottom of the absorption bin, each motor is connected to a controller and is controlled by the controller; the connecting shaft is arranged in the center of the bin and vertically upward, the opening arranged in the center of the tail gas diffusion buffer plate is adapted to the diameter of the connecting shaft, and the stirring paddle is arranged on the connecting shaft through a fitting device. The height of the connecting shaft is close to the height of the liquid level.

[0011] Preferably, a plurality of groups of stirring paddles are arranged on the connecting shaft, and a group of stirring paddles is arranged below each layer of the exhaust gas diffusion buffer plate, and the number of groups of stirring paddles is the same as the number of layers of the exhaust gas diffusion buffer plate.

[0012] Preferably, the bottom end surface of the bubble dispersion and release device is arc-shaped, and a plurality of hole structures are evenly arranged thereon.

[0013] Preferably, an electric valve is provided at the entrance of the air inlet pipe into the first-level absorption bin and an electric valve is provided at the entrance of the first-level exhaust pipe into the second-level absorption bin; a waste liquid discharge outlet and an electric valve are provided at the side bottom of the first-level absorption bin and the second-level absorption bin; sound and light alarms are installed on the outside of the first-level absorption bin and the second-level absorption bin; the electric valve and the sound and light alarm are connected to a controller.

[0014] Preferably, a pH value detection sensor is installed in the side bottom of the first-level absorption bin and the second-level absorption bin; an acidic substance detection sensor is set on the outer section of the absorption bin of the first-level exhaust pipe and the second-level exhaust pipe; the pH value detection sensor and the acidic substance detection sensor are connected to the controller and transmit the monitored data signal to the controller.

[0015] Preferably, ultrasonic liquid level detection sensors are arranged at the top of the primary absorption bin and the secondary absorption bin; contact liquid level detection sensors are installed on the pipes connected to the alkali solution storage cylinder through the upper liquid pipe and entering the primary absorption bin and the secondary absorption bin, and on the top of the alkali solution storage cylinder; the ultrasonic liquid level detection sensor and the contact liquid level detection sensor are connected to the controller and transmit the monitored data signals to the controller.

[0016] An application method of a lithium battery electrolyte tail gas absorption device. Before use, a controller sets the thresholds of an audible and visual alarm device, an acidic substance detection sensor, a pH value detection sensor, a contact liquid level detection sensor or an ultrasonic liquid level detection sensor to facilitate control. Each threshold is set according to actual needs. The application method comprises the following steps:

[0017] (1) The tail gas enters the inner bottom of the primary absorption chamber through the air intake pipe, diffuses into the alkali solution through the hole structure on the bubble dispersion and release device, and floats up; during the floating process, it is sheared into smaller bubbles by the stirring paddle and evenly dispersed in the alkali solution, increasing the contact area with the alkali solution and absorbing;

[0018] (2) The remaining gas is blocked by the tail gas diffusion plate buffer plate, and is evenly dispersed into smaller bubbles and rises in a curve, passes through the alkali solution on the upper layer, enters the first-level absorption chamber above the alkali solution level, and enters the first-level exhaust pipe. After being detected by the acid substance detection sensor, the concentration of the detected acid substance is large, and enters the second-level absorption chamber through the first-level exhaust pipe;

[0019] (3) The remaining gas enters the inner bottom of the secondary absorption chamber, diffuses into the alkali solution through the hole structure on the bubble dispersion and release device, and floats up; during the floating process, it is sheared into smaller bubbles by the stirring paddle and evenly dispersed in the alkali solution, increasing the contact area with the alkali solution and absorbing; then it passes through the tail gas diffusion plate buffer plate, is evenly dispersed into smaller bubbles, passes through the upper alkali solution into the secondary absorption chamber above the alkali solution surface, and enters the secondary exhaust pipe. After being detected by the acidic substance detection sensor, if the detected acidic substance concentration is high, it is re-introduced into the primary absorption chamber. If the detected acidic substance concentration meets the requirements, it is discharged into the atmosphere;

[0020] (4) When the pH value detection sensor detects that the pH value of the primary absorption chamber and the secondary absorption chamber is about 5.5 to 7, the controller opens the electric valve of the waste liquid outlet to discharge the waste liquid; when the pH value detection sensor detects an abnormal signal, the sound and light alarm sounds; the contact liquid level detection sensor or the ultrasonic liquid level detection sensor detects a drop in the liquid level and transmits the signal to the controller, and the controller starts the liquid pump to input the alkali liquid in the alkali liquid storage tank into the absorption chamber; if the alkali liquid level in the alkali liquid storage tank is too low, alkali liquid is input from the alkali liquid inlet.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The lithium battery electrolyte tail gas absorption system of the present invention adopts a tail gas diffusion buffer plate to block the tail gas from rising, and makes the tail gas diffuse evenly and rise in a curve, thereby increasing the contact time and contact area between the tail gas and the alkali solution and improving the treatment effect of the tail gas.

[0023] The lithium battery electrolyte tail gas absorption system of the present invention adopts a stirring paddle with high power to stir the gas and liquid more fully, and shear the gas, so that the bubbles of tail gas in the liquid are more easily broken into multiple small bubbles, thereby increasing the contact area between the tail gas and the alkali solution.

[0024] The lithium battery electrolyte tail gas absorption system of the present invention adopts a two-stage absorption chamber for treatment, and the tail gas is introduced into the inner bottom and then rises layer by layer, so that the tail gas treatment is more complete, the absorption effect is better, and the efficiency is higher.

[0025] The lithium battery electrolyte tail gas absorption system of the present invention uses multi-level detection and automatic control, such as acidic substance detection sensors, ultrasonic liquid level detection sensors, contact liquid level detection sensors, sound and light alarms, etc. The whole system has a high degree of integration, and the control and monitoring are more scientific and reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall main structure of the present invention;

[0027] Figure 2 It is a front view schematic diagram of the bubble dispersion and release device of the present invention;

[0028] Figure 3 It is a bottom view schematic diagram of the bubble dispersion and release device of the present invention;

[0029] Figure 4 It is a schematic top view of the structure of the mechanical stirring device of the present invention.

[0030] Figure 5 It is a top view of the horizontal section of the air intake pipe or the first-stage exhaust pipe of the present invention.

[0031] In the figure: 1. air intake pipe; 2. electric valve; 3. exhaust gas diffusion buffer plate; 4. connecting shaft; 5. contact liquid level detection sensor; 6. alkali solution feed port; 7. stirring paddle; 8. waste liquid discharge port 9. base bracket; 10. motor; 11. screw; 12. fixed support plate; 13. pH value detection sensor; 14. sound and light alarm; 15. upper liquid pump; 16. alkali solution inlet; 17. alkali solution storage tank; 18. interlocking device; 19. bubble dispersion and release device; 20. acidic substance detection sensor; 21. hole structure; 22. primary absorption chamber; 23. secondary absorption chamber; 24. air intake pipe; 25. upper liquid pipeline; 26. primary exhaust pipe; 27. ultrasonic liquid level detection sensor; 28. secondary exhaust pipe. DETAILED DESCRIPTION

[0032] The drawings are for illustrative purposes only; for those skilled in the art, some well-known structures and their descriptions in the drawings may be omitted, and therefore, they cannot be understood as limitations on the present invention. In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; the terms "upper", "lower", "left", "right", "side", "outer", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the present invention.

[0033] It should be understood that “first”, “second”, etc. are only for the convenience of description and do not refer to certain technical features and cannot be understood as limitations on the present invention.

[0034] The principles and features of the present invention are described below in conjunction with the examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention. If no specific conditions are specified in the examples, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturers of the instruments and equipment used are not specified, they are all conventional products that can be purchased commercially. Other technical methods not described adopt existing technologies.

[0035] Example 1

[0036] A lithium battery electrolyte tail gas absorption device, comprising a controller, a primary absorption chamber 22 and a secondary absorption chamber 23, both of which are fixed and supported by a base bracket 9, wherein the primary absorption chamber 22 is connected to the secondary absorption chamber 23 via a primary exhaust pipe 26;

[0037] An air inlet pipe 1 is arranged at the middle and upper part of the side wall of the first-level absorption bin 22, and the part of the air inlet pipe 1 after extending into the first-level absorption bin 22 includes a vertical section and a horizontal section. The first-level exhaust pipe 26 is connected from the top of the first-level absorption bin 22 to the top entrance of the side wall of the second-level absorption bin 23, and the part after entering the second-level absorption bin 23 has the same shape as the air inlet pipe 1, including a vertical section and a horizontal section; each of the vertical sections passes downward along the inner wall of the absorption bin into the bottom, and each of the horizontal sections is diffused into a main pipe and two branch pipes distributed at the bottom of the absorption bin, and each branch pipe is provided with two bubble dispersion and release devices 19; a second-level exhaust pipe 28 is arranged at the top of the second-level absorption bin 23 to discharge the final gas.

[0038] A mechanical stirring device is provided in the center of the primary absorption bin 22 and the secondary absorption bin 23. The exhaust gas absorption device has an air inlet and outlet pipe, a secondary exhaust pipe, and other connections are sealed. A controller can control the operation of the device.

[0039] Example 2

[0040] A lithium battery electrolyte tail gas absorption device, comprising a controller, a primary absorption chamber 22 and a secondary absorption chamber 23, both of which are fixed and supported by a base bracket 9, wherein the primary absorption chamber 22 is connected to the secondary absorption chamber 23 via a primary exhaust pipe 26;

[0041] The first-level absorption chamber 22 is provided with an air inlet pipe 1 at the middle and upper part of the side wall. The part of the air inlet pipe 1 extending into the first-level absorption chamber 22 includes a vertical section and a horizontal section. The first-level exhaust pipe 26 is connected from the top of the first-level absorption chamber 22 to the top entrance of the side wall of the second-level absorption chamber 23. The part after entering the second-level absorption chamber 23 has the same shape as the air inlet pipe 1, including a vertical section and a horizontal section. Each of the vertical sections passes downward along the inner wall of the absorption chamber into the bottom. Each of the horizontal sections is diffused into a main pipe and three branch pipes evenly distributed at the bottom of the absorption chamber. Three bubble dispersion and release devices 19 are provided on each branch pipe. The bottom end face of the bubble dispersion and release device 19 is arc-shaped, and a number of hole structures 21 are evenly provided thereon. A second-level exhaust pipe 28 is provided at the top of the second-level absorption chamber 23 to discharge the final gas.

[0042] A mechanical stirring device is provided in the center of the primary absorption bin 22 and the secondary absorption bin 23. Each of the mechanical stirring devices comprises a motor 10, a connecting shaft 4 and a stirring paddle 7. Each motor 10 is provided at the outer bottom of the absorption bin, and each motor 10 is connected to a controller and is controlled by the controller; the connecting shaft 4 is provided in the bin and vertically upward, and a stirring paddle 7 is provided on the connecting shaft 4 through an interlocking device 18. The height of the connecting shaft 4 is close to the height of the liquid level. Two groups of stirring paddles 7 are provided on the connecting shaft 4. The stirring paddle 7 is connected to 3 to 5 blades through an interlocking device 18, and each blade has a sharp corner and a sharp edge, which can shear and break bubbles.

[0043] The exhaust gas absorption device has an air inlet and outlet pipe, a secondary exhaust pipe, and other joints that are all sealed.

[0044] The tail gas absorption device also includes an alkali liquid storage cylinder 17, which is connected to the primary absorption bin 22 and the secondary absorption bin 23 through an upper liquid pipeline 25. The side walls of the primary absorption bin 22 and the secondary absorption bin 23 are respectively provided with inlets, which are located in the middle and upper parts of the side walls of the primary absorption bin 22 and the secondary absorption bin 23. Each upper liquid pipeline 25 absorbs alkali liquid upward through an upper liquid pump 15, and each upper liquid pump 15 is connected to and controlled by a controller. The alkali liquid storage cylinder 17 is provided with an alkali liquid inlet 16, and the alkali liquid storage cylinder 17 is used to store fresh alkali liquid so as to timely supplement the insufficient alkali liquid in the primary absorption bin 22 and the secondary absorption bin 23.

[0045] Example 3

[0046] like Figure 1As shown, a lithium battery electrolyte tail gas absorption device includes a controller (omitted in the figure, the controller uses a computer control program), and also includes a primary absorption chamber 22 and a secondary absorption chamber 23, both of which are fixed and supported by a base bracket 9, and the primary absorption chamber 22 is connected to the secondary absorption chamber 23 through a primary exhaust pipe 26;

[0047] The first-level absorption bin 22 is provided with an air inlet pipe 1 at the middle and upper part of the side wall. The part of the air inlet pipe 1 extending into the first-level absorption bin 22 includes a vertical section and a horizontal section. The first-level exhaust pipe 26 is connected from the top of the first-level absorption bin 22 to the top entrance of the side wall of the second-level absorption bin 23. The part after entering the second-level absorption bin 23 has the same shape as the air inlet pipe 1, including a vertical section and a horizontal section. Each of the vertical sections extends downward along the inner wall of the absorption bin to the bottom. Each of the horizontal sections is diffused into a main pipe and four branch pipes distributed at the bottom of the absorption bin. Four bubble dispersion and release devices 19 are provided on each branch pipe. The bottom end face of the bubble dispersion and release device 19 is arc-shaped, and a number of hole structures 21 are evenly arranged on it. Figure 2 , 3 As shown, the gas in the air inlet pipe 1 enters the bubble dispersion and release device 19 and is discharged into the absorption chamber through the hole structure 21. A secondary exhaust pipe 28 is arranged at the top of the secondary absorption chamber 23 to discharge the final gas.

[0048] A mechanical stirring device is provided in the center of the primary absorption bin 22 and the secondary absorption bin 23. Each of the mechanical stirring devices comprises a motor 10, a connecting shaft 4 and a stirring paddle 7. Each motor 10 is provided at the outer bottom of the absorption bin. Each motor 10 is connected to a controller and is controlled by the controller. Each motor 10 provides power to accelerate the breaking of bubbles through external force, thereby increasing the contact area between the bubbles and the alkali solution. The connecting shaft 4 is provided in the bin and vertically upward, and a stirring paddle 7 is provided on the connecting shaft 4 through a fitting device 18. The height of the connecting shaft 4 is close to the height of the liquid level.

[0049] like Figure 4 As shown, three groups of stirring paddles 7 are arranged on the connecting shaft 4. The stirring paddles 7 are connected to five blades through an interlocking device 18, and each blade has a sharp corner and a sharp edge, which can shear and break the bubbles.

[0050] The exhaust gas absorption device has an air inlet and outlet pipe, a secondary exhaust pipe, and other joints are all sealed.

[0051] The tail gas absorption device also includes an alkali liquid storage cylinder 17, which is connected to the primary absorption bin 22 and the secondary absorption bin 23 through an upper liquid pipeline 25. The side walls of the primary absorption bin 22 and the secondary absorption bin 23 are respectively provided with inlets, which are located in the middle and upper parts of the side walls of the primary absorption bin 22 and the secondary absorption bin 23. Each upper liquid pipeline 25 absorbs alkali liquid upward through an upper liquid pump 15, and each upper liquid pump 15 is connected to a controller and controlled by the controller. Each upper liquid pump 15 is installed on a fixed support plate 12 extending from the primary absorption bin 22 and the secondary absorption bin 23, and is connected by screws. Each upper liquid pipeline 25 is inserted into the alkali liquid feed port 6 inside the absorption bin and is equipped with a contact liquid level detection sensor 5.

[0052] The first-level absorption bin 22 and the second-level absorption bin 23 have three layers of tail gas diffusion buffer plates 3, and the tail gas diffusion buffer plates 3 are set in the alkali solution; the inner walls of the first-level absorption bin 22 and the second-level absorption bin 23 are provided with horizontal fixed support plates 12, and the tail gas diffusion buffer plates 3 are installed on the fixed support plates 12 by screws, and the lowermost fixed support plates 12 in the bin support the horizontal sections of the intake pipe 1 and the first-level exhaust pipe 26; a plurality of air holes are evenly arranged on each tail gas diffusion buffer plate 3, and an opening is arranged in the center thereof. The tail gas diffusion buffer plate 3 is arranged above the stirring paddle 7, and the number of groups of the stirring paddle 7 is the same as the number of layers of the tail gas diffusion buffer plate 3, and the opening in the middle of the tail gas diffusion buffer plate 3 is adapted to the connecting shaft 4.

[0053] The air inlet pipe 1 is provided with an electric valve 2 at the entrance of the first-level absorption bin 22, and the first-level exhaust pipe 26 is provided with an electric valve 2 at the entrance of the second-level absorption bin 23; the first-level absorption bin 22 and the second-level absorption bin 23 are provided with a waste liquid discharge outlet 8 and an electric valve at the side bottom; an audible and visual alarm 14 is installed on the outside of the first-level absorption bin 22 and the second-level absorption bin 23; the electric valve 2 and the audible and visual alarm 14 are connected to the controller.

[0054] As a further preference, a pH value detection sensor 13 is installed in the side bottom of the first-level absorption chamber 22 and the second-level absorption chamber 23; an acidic substance detection sensor 20 is set on the outer section of the absorption chamber of the first-level exhaust pipe 26 and the second-level exhaust pipe 28; the pH value detection sensor 13 and the acidic substance detection sensor 20 are connected to the controller and transmit the monitored data signal to the controller.

[0055] As a further preference, ultrasonic liquid level detection sensors 27 are provided at the top of the primary absorption bin 22 and the secondary absorption bin 23; the ultrasonic liquid level detection sensor 27 and the contact liquid level detection sensor 5 are connected to the controller and transmit the monitored data signals to the controller.

[0056] An application method of a lithium battery electrolyte tail gas absorption device. Before use, the controller sets the thresholds of the sound and light alarm device 14, the acid substance detection sensor 20, the pH value detection sensor 13, the contact liquid level detection sensor 5 or the ultrasonic liquid level detection sensor 27 for easy control. Each threshold is set according to actual needs. The primary absorption chamber 22 and the secondary absorption chamber 23 should have sufficient alkaline solution during the working process, such as Ca(OH)2 solution, NaOH solution, KOH solution, etc. The application method comprises the following steps:

[0057] (1) The exhaust gas enters the inner bottom of the primary absorption chamber 22 through the air inlet pipe 1, diffuses into the alkali solution through the hole structure 21 on the bubble dispersion and release device 19, and floats up; during the floating process, the exhaust gas is sheared into smaller bubbles by the stirring paddle 7 and evenly dispersed in the alkali solution, thereby increasing the contact area with the alkali solution and absorbing it;

[0058] (2) The remaining gas passes through the tail gas diffusion plate buffer plate 3, slowing down the speed of upward diffusion, and is evenly dispersed into smaller bubbles and rises in a curve, passes through the upper alkali solution into the first-level absorption chamber 22 above the alkali solution surface, and enters the first-level exhaust pipe 26. After being detected by the acidic substance detection sensor 20, if the detected acidic substance concentration is high, it enters the second-level absorption chamber through the first-level exhaust pipe 26;

[0059] (3) The remaining gas enters the inner bottom of the secondary absorption chamber 23, diffuses into the alkali solution through the hole structure on the bubble dispersion and release device 19, and floats up; in the process of floating up, it is sheared into smaller bubbles by the stirring paddle 7 and evenly dispersed in the alkali solution, increasing the contact area with the alkali solution and absorbing; then it is blocked by the tail gas diffusion plate buffer plate 3, evenly dispersed into smaller bubbles and rises in a curve, passes through the alkali solution on the upper layer, enters the alkali solution surface of the secondary absorption chamber, and enters the secondary exhaust pipe 28. After being detected by the acidic substance detection sensor 20, if the detected acidic substance concentration is large, it is re-introduced into the primary absorption chamber. If the detected acidic substance concentration meets the requirements, it is discharged into the atmosphere;

[0060] (4) The pH value detection sensor detects that the pH value of the primary absorption chamber 22 and the secondary absorption chamber 23 is about 7 or 6, and the controller opens the electric valve of the waste liquid discharge port 8 to discharge the waste liquid; when the pH value detection sensor 13 detects an abnormal signal (either too large or too small, too large, for example, when the pH value is always 13 or 14, it means that the absorption tail gas is weak, and if the pH value is below 5, the alkali solution will soon become saturated), the sound and light alarm alarm 14; the contact liquid level detection sensor 5 or the ultrasonic liquid level detection sensor 27 detects that the liquid level has dropped, and transmits the signal to the controller, and the controller starts the liquid pump 15 to input the fresh alkali solution in the alkali solution storage tank 17 into the absorption chamber; if the alkali solution level in the alkali solution storage tank 17 is too low, alkali solution is input from the alkali solution inlet 16.

[0061] The exhaust gas enters the primary absorption chamber 22 through the air intake pipe 1, and is subdivided by the bubble dispersion and release device 19 before entering the alkaline solution inside the primary absorption chamber 22. The stirring paddle 7 below performs secondary crushing and refinement to reach the first layer of exhaust gas diffusion buffer plate 3. The first layer of exhaust gas diffusion buffer plate 3 uses the pores to perform tertiary crushing and refinement to reach the second layer. Then, after multiple crushing and refinement by the stirring paddle 7 and the exhaust gas diffusion buffer plate 3, the exhaust gas enters the secondary absorption chamber 23 through the primary exhaust pipe 26. The above process is repeated to achieve secondary absorption and detection of the exhaust gas.

[0062] The contact type liquid level detection sensor 5 is screwed onto the pipe of the alkali solution feed port 6. When the liquid level in the primary absorption bin 22 or the secondary absorption bin 23 is out of the height detected by the contact type liquid level detection sensor 5, the controller controls the upper liquid pump 15 to start working, replenishing the alkali solution in the primary absorption bin 22 or the secondary absorption bin 23 until the liquid level returns to a detectable height.

[0063] The probe of the acidic substance detection sensor 20 extends into the first-stage exhaust pipe 26 and the second-stage exhaust pipe 28 to detect the concentration value of the gas inside the first-stage exhaust pipe 26 and the second-stage exhaust pipe 28 in real time.

[0064] The ultrasonic liquid level detection sensor 27 is fixed on the cover plates on the top of the primary absorption bin 22 and the secondary absorption bin 23 by threads. When the contact liquid level detection sensor 5 works abnormally, the ultrasonic liquid level detection sensor 27 starts to work and determines the liquid level height by ultrasonic signal detection.

[0065] Example 4

[0066] The electric valve on the primary exhaust pipe is replaced with a three-way valve, and the other pipeline of the three-way valve is connected to the atmosphere and enters the primary exhaust pipe 26. After detection by the acid substance detection sensor 20, if the detected acid substance concentration is small and meets the index, it is discharged to the atmosphere.

[0067] Other unmentioned parts are the same as those in Example 3.

[0068] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A lithium battery electrolyte tail gas absorption device, comprising a controller, characterized in that: It also includes a primary absorption bin and a secondary absorption bin, wherein the primary absorption bin and the secondary absorption bin are both fixed and supported by a base bracket, and the primary absorption bin is connected to the secondary absorption bin through a primary exhaust pipe; The first-level absorption bin is provided with an air inlet pipe at the middle and upper part of the side wall, and the part of the air inlet pipe extending into the first-level absorption bin includes a vertical section and a horizontal section. The first-level exhaust pipe is connected from the top of the first-level absorption bin to the top entrance of the side wall of the second-level absorption bin, and the part after entering the second-level absorption bin has the same shape as the air inlet pipe, including a vertical section and a horizontal section; each of the vertical sections passes downward along the inner wall of the absorption bin into the bottom, and each of the horizontal sections is diffused into a main pipe and at least two branch pipes distributed at the bottom of the absorption bin, and each branch pipe is provided with at least one bubble dispersion and release device; a second-level exhaust pipe is provided at the top of the second-level absorption bin; Mechanical stirring devices are arranged inside the first-level absorption bin and the second-level absorption bin.

2. A lithium battery electrolyte tail gas absorption device according to claim 1, characterized in that: It also includes an alkali liquid storage cylinder, which is connected to the primary absorption bin and the secondary absorption bin through an upper liquid pipeline. The side walls of the primary absorption bin and the secondary absorption bin are respectively provided with inlets, and the inlets are located in the middle and upper parts of the side walls of the primary absorption bin and the secondary absorption bin. Each upper liquid pipeline absorbs the alkali liquid upward through an upper liquid pump, and each upper liquid pump is connected to a controller and controlled by the controller.

3. A lithium battery electrolyte tail gas absorption device according to claim 1, characterized in that: At least one layer of exhaust gas diffusion buffer plate is installed in the first-level absorption bin and the second-level absorption bin, and the exhaust gas diffusion buffer plate is set in the alkaline solution; the inner walls of the first-level absorption bin and the second-level absorption bin are provided with horizontal fixed support plates, and the exhaust gas diffusion buffer plate is installed on the fixed support plates by screws, and the lowermost fixed support plate supports the horizontal sections of the intake pipe and the first-level exhaust pipe; a plurality of air holes are evenly arranged on the exhaust gas diffusion buffer plate, and an opening is arranged in the center thereof.

4. A lithium battery electrolyte tail gas absorption device according to claim 3, characterized in that: Each of the mechanical stirring devices includes a motor, a connecting shaft and a stirring paddle. Each motor is arranged at the outer bottom of the absorption bin. Each motor is connected to a controller and controlled by the controller. The connecting shaft is arranged in the center of the bin and vertically upward. The opening arranged in the center of the exhaust gas diffusion buffer plate is adapted to the diameter of the connecting shaft, and multiple groups of stirring paddles are arranged on the connecting shaft.

5. A lithium battery electrolyte tail gas absorption device according to claim 4, characterized in that: The number of the stirring paddles is the same as the number of the layers of the exhaust gas diffusion buffer plates, and a group of stirring paddles is arranged below each layer of the exhaust gas diffusion buffer plates.

6. A lithium battery electrolyte tail gas absorption device according to claim 1, characterized in that: The bottom end surface of the bubble dispersion and release device is arc-shaped, and a plurality of hole structures are evenly arranged on it.

7. A lithium battery electrolyte tail gas absorption device according to claim 1, characterized in that: An electric valve is arranged at the entrance of the air inlet pipe into the first-level absorption bin and at the entrance of the first-level exhaust pipe into the second-level absorption bin; a waste liquid discharge outlet and an electric valve are arranged at the side bottom of the first-level absorption bin and the second-level absorption bin; sound and light alarms are installed on the outside of the first-level absorption bin and the second-level absorption bin; the electric valve and the sound and light alarm are connected to a controller.

8. The lithium battery electrolyte tail gas absorption device according to claim 1, characterized in that: A pH value detection sensor is installed in the side bottom of the first-level absorption bin and the second-level absorption bin; an acid substance detection sensor is arranged on the outer section of the absorption bin of the first-level exhaust pipe and the second-level exhaust pipe; the pH value detection sensor and the acid substance detection sensor are connected to the controller and transmit the monitored data signal to the controller.

9. A lithium battery electrolyte tail gas absorption device according to claim 1, characterized in that: Ultrasonic liquid level detection sensors are arranged at the top of the primary absorption bin and the secondary absorption bin; contact liquid level detection sensors are installed on the pipes connected to the alkali solution storage cylinder through the upper liquid pipe and entering the primary absorption bin and the secondary absorption bin, as well as on the top of the alkali solution storage cylinder. The ultrasonic liquid level detection sensor and the contact liquid level detection sensor are connected to the controller and transmit the monitored data signals to the controller.

10. The application method of the lithium battery electrolyte tail gas absorption device according to any one of claims 1 to 9, characterized in that: The steps include: (1) The tail gas enters the inner bottom of the primary absorption chamber through the air intake pipe, diffuses into the alkali solution through the hole structure on the bubble dispersion and release device, and floats up; during the floating process, it is sheared into smaller bubbles by the stirring paddle and evenly dispersed in the alkali solution, increasing the contact area with the alkali solution and absorbing; (2) The remaining gas is blocked by the tail gas diffusion plate buffer plate, and is evenly dispersed into smaller bubbles and rises in a curve, passes through the alkali solution on the upper layer, enters the first-level absorption chamber above the alkali solution level, and enters the first-level exhaust pipe. After being detected by the acidic substance detection sensor, if the detected acidic substance concentration is high, it enters the second-level absorption chamber through the first-level exhaust pipe; (3) The remaining gas enters the inner bottom of the secondary absorption chamber, diffuses into the alkali solution through the hole structure on the bubble dispersion and release device, and floats up; during the floating process, it is sheared into smaller bubbles by the stirring paddle and evenly dispersed in the alkali solution, increasing the contact area with the alkali solution and absorbing; then it passes through the tail gas diffusion plate buffer plate, is evenly dispersed into smaller bubbles, passes through the upper alkali solution into the secondary absorption chamber above the alkali solution surface, and enters the secondary exhaust pipe. After being detected by the acidic substance detection sensor, if the detected acidic substance concentration is high, it is re-introduced into the primary absorption chamber. If the detected acidic substance concentration meets the requirements, it is discharged into the atmosphere; (4) When the pH value detection sensor detects that the pH value of the primary absorption tank and the secondary absorption tank is 5.5-7, the controller opens the electric valve of the waste liquid outlet to discharge the waste liquid; the contact liquid level detection sensor or the ultrasonic liquid level detection sensor detects that the liquid level has dropped, transmits the signal to the controller, and the sound and light alarm sounds. The controller starts the liquid pump to input the alkali liquid in the alkali liquid storage tank into the absorption tank; if the alkali liquid level in the alkali liquid storage tank is too low, alkali liquid is input from the alkali liquid inlet.

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