A multi-stage processing battery recycling tail gas treatment system

Abstract

This invention discloses a multi-stage battery recycling exhaust gas treatment system, comprising: a primary alkaline scrubbing tower, a secondary alkaline scrubbing tower, a demister, and an activated carbon purifier. The secondary alkaline scrubbing tower includes a tower body for alkaline scrubbing, with an air inlet end including an air inlet grille at one end. A spray net is installed above the air inlet grille, and the spray net is connected to a liquid storage tank in the tower body via a circulation pipe. An adaptive slag removal structure is installed above the liquid storage tank inside the tower body, including an isolation seat surrounding the inner wall of the tower body. An adjusting member providing binding force is longitudinally installed on the inner side of the isolation seat, and a floating member is slidably installed on the outer side of the isolation seat. The bottom surface of the floating member contacts the upper liquid surface of the liquid storage tank, and the top surface of the floating member communicates with an external discharge component. This invention can perform multiple slag removal processes on the circulating alkaline scrubbing liquid during battery crushing, effectively reducing the fluorine content of the circulating liquid and the output gas.

Description

Technical Field

[0001] This invention relates to a battery recycling device, and more particularly to a multi-stage exhaust gas treatment system for battery recycling. Background Technology

[0002] During the battery crushing process, the electrolyte will evaporate as the temperature rises during the crushing and pyrolysis of the fragments. The evaporated electrolyte gas is a toxic, flammable, and explosive hazardous waste, mainly containing volatile organic compounds (VOCs) and highly toxic hydrogen fluoride (HF) gas. These waste gases cannot be directly discharged to the outside and need to be treated separately before they can be released into the atmosphere.

[0003] Traditional treatment involves passing the waste gas through an alkaline scrubbing tower for one or two alkaline scrubbing sessions. After the alkaline scrubbing process removes hydrogen fluoride, the gas is then passed through an activated carbon purifier to remove VOCs. However, during alkaline scrubbing, crystals often form, clogging the circulation system and requiring occasional shutdowns for cleaning. Existing technologies incorporate slag removal structures in the circulation system to collect and discharge some of the generated crystals. However, some small crystals are difficult to collect by the slag removal structure after formation and are easily sprayed again through the circulation structure. Consequently, they flow out from the top with the "clean gas," resulting in incomplete removal of fluorine from the discharged gas and affecting its purity.

[0004] Therefore, this invention aims to provide a multi-stage exhaust gas treatment system for battery recycling, which can not only adjust its own slag removal height according to the height of the circulating alkaline solution, but also remove slag from the circulating liquid multiple times during the circulation process, ensuring that the fluoride content of the circulating liquid and the output gas decreases. Summary of the Invention

[0005] This invention provides a multi-stage exhaust gas treatment system for battery recycling, which can effectively solve the above-mentioned problems.

[0006] This invention is implemented as follows: A multi-stage exhaust gas treatment system for battery recycling includes: A primary alkaline scrubbing tower for receiving exhaust gas, the outlet of the primary alkaline scrubbing tower being connected to a secondary alkaline scrubbing tower, the outlet of the secondary alkaline scrubbing tower being connected to a demister, the gas passing through the demister being output to an activated carbon purifier for purification; the secondary alkaline scrubbing tower includes a tower body for alkaline scrubbing, one end of the tower body being provided with an air inlet including an air inlet grille, the upper end of the air inlet grille being provided with a spray net, the spray net being connected to the liquid storage tank of the tower body through a circulation pipe. An adaptive slag removal structure is installed at the upper end of the liquid storage tank inside the tower body. The adaptive slag removal structure includes an isolation seat surrounding the inner wall of the tower body. An adjusting member that provides binding force is longitudinally installed on the inner side of the isolation seat. A floating member is slidably installed on the outer side of the isolation seat. The bottom surface of the floating member is in contact with the upper liquid surface of the liquid storage tank. The top surface of the floating member is connected to an external discharge component. After the floating member floats with the liquid surface, it is fixed by the adjusting member and the external discharge component discharges the crystals on the liquid surface.

[0007] As a further improvement, the air intake grille includes a receiving frame installed on the inside of the tower body, a rotating cage frame is provided on the receiving frame, a plurality of air intake meshes are provided on the inner side of the rotating cage frame, and an inner rotating frame is provided on the outer side of the rotating cage frame.

[0008] As a further improvement, the isolation seat includes several L-shaped plates fixed to the inner wall of the tower body, the L-shaped plates forming a circular structure, and a movable slit is opened on the inner side of the L-shaped plate, and the floating component is slidably disposed in the movable slit.

[0009] As a further improvement, the adjusting member includes a power supply disposed inside the isolation seat, and an electromagnet is disposed on the output end of the power supply.

[0010] As a further improvement, the electromagnet is a longitudinally elongated strip structure.

[0011] As a further improvement, the floating component includes a movable shaft that slides up and down within the movable slot. An adsorption magnet is provided at the end of the movable shaft near the adjusting component, and an extension shaft is provided at the end of the movable shaft away from the adjusting component. The extension shaft is hollow, and a floating suction device is provided at the bottom of the extension shaft.

[0012] As a further improvement, the floating suction device includes a suction box disposed at the lower end of the extension shaft, a floating plate being disposed at the bottom of the suction box, and the inlet of the suction box being in contact with the liquid surface of the storage tank.

[0013] As a further improvement, the suction box has a Z-shaped structure.

[0014] As a further improvement, the external discharge assembly includes an elastic conduit disposed on top of the floating component, the other end of which is connected to a fixed pipe that extends to the outside of the tower body and is connected to an external negative pressure suction structure.

[0015] The beneficial effects of this invention are: In existing technologies, the fine crystals generated during the alkaline washing of waste gas are difficult to collect by the slag removal structure after formation. They are easily sprayed again by the circulation structure and then flow out from the top with the "clean gas," resulting in the fluoride in the discharged gas not being completely removed, which can easily affect the purity of the discharged gas. Therefore, this invention uses an adaptive slag removal structure with a floating component at the upper end of the storage tank. The floating component can change with the liquid level in the storage tank, and the fine crystals floating on the liquid surface are sucked in by the discharge component. However, due to its adaptability, the floating component is prone to fluctuation in position when sucking in crystals, which can easily lead to the omission of some crystals. Therefore, this invention also fixes the floating component with an adjusting component after the floating component is adjusted, so that the floating component can maintain its stability when sucking in crystals.

[0016] When exhaust gas is first introduced, the intake grille can evenly disperse the exhaust gas and allow it to rise to contact the packing. However, during alkaline washing, some of the crystals generated fall onto the intake grille, which not only easily obstructs the air intake but also allows the sprayed liquid to come into contact with the crystals multiple times. Therefore, this invention sets the rotating cage on the receiving frame, so that the incoming exhaust gas drives the rotating cage to rotate through the inner rotating frame, thereby allowing the crystals that fall onto the intake grille to continuously tumble until they fall into the liquid storage tank, thus improving the air intake efficiency and liquid return efficiency.

[0017] Although the adjusting component is not a precision electronic component, it is still necessary to avoid direct contact with hydrogen fluoride in an environment containing hydrogen fluoride gas. Therefore, the adjusting component of this invention is set inside the isolation seat. The L-shaped plate of the isolation seat covers the adjusting component and guides the liquid after spraying, leaving only a movable slit for the floating component to pass through.

[0018] Because it is in a corrosive environment, it is not suitable to set up a lot of power structures, otherwise it will be very easy to be affected by acidic conditions. However, without a fixed structure, the overall structure will inevitably become unstable due to the back suction force during suction. Therefore, the adjustment component of this invention is a simple electrical switch combined with an electromagnet, which can be energized when in use and is not afraid of acid mist corrosion when not in use.

[0019] The height of the spray liquid varies in different devices, and the liquid level also changes in real time. Installers cannot predict the liquid level during use during the installation phase. Therefore, the floating component of this invention is set as a floating suction device with buoyancy. It can float on the top of the spray liquid and change with the liquid level. When suction is needed, it is fixed by the cooperation of the adjusting component and the adsorption magnet, thereby forming a stable structure and ensuring the effect of suction crystallization.

[0020] Because the entire floating suction device needs to float on the spray liquid and also needs to have a suction effect, the floating suction device of the present invention not only has a suction box, but also needs to be equipped with a floating plate at the bottom of the suction box, so that the entire floating suction device floats on the spray liquid through the floating plate. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is an overall schematic diagram of the present invention.

[0023] Figure 2 This is a three-dimensional structural diagram of the two-stage alkaline washing tower of the present invention.

[0024] Figure 3 This is a top view schematic diagram of the two-stage alkaline washing tower of the present invention.

[0025] Figure 4 This is the present invention. Figure 3 Cross-sectional view at point AA.

[0026] Figure 5 This is the present invention. Figure 4 A magnified view of region A in the middle.

[0027] Figure 6 This is the present invention. Figure 4 A magnified view of region B in the middle.

[0028] Figure 7 This is a schematic diagram of the structure of the floating suction device of the present invention.

[0029] In the picture: 10. Primary alkaline washing tower, 20. Secondary alkaline washing tower, 21. Tower body, 22. Air inlet grille, 221. Receiving frame, 222. Rotating cage, 223. Air inlet net, 224. Air inlet end, 23. Spray net, 24. Adaptive slag removal structure, 25. Isolation seat, 251. L-shaped plate, 2512. Movable joint, 252. Adjusting component, 2521. Electromagnet, 2522. Floating component, 253. Moving shaft, 2531. Adsorption magnet, 2532. Extension shaft, 2533. Floating suction device, 2534. Suction box, 25341. Floating plate, 25342. External discharge assembly, 254. Elastic conduit, 2541. Fixed pipe, 2542. Demister, 30. Activated carbon purifier, 40. Detailed Implementation

[0030] All embodiments of the present invention are intended to fall within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating that the purpose, technical solution, and advantages of the method are clearer. The technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort indicate or imply the relative importance of the indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] Reference Figures 1 to 7 As shown, a multi-stage battery recycling exhaust gas treatment system includes: a primary alkaline scrubbing tower 10 for receiving exhaust gas, the outlet of the primary alkaline scrubbing tower 10 being connected to a secondary alkaline scrubbing tower 20, the outlet of the secondary alkaline scrubbing tower 20 being connected to a demister 30, and the gas passing through the demister 30 being output to an activated carbon purifier 40 for purification; the secondary alkaline scrubbing tower 20 includes a tower body 21 for alkaline scrubbing, one end of the tower body 21 being provided with an air inlet 23 including an air inlet grille 22, the upper end of the air inlet grille 22 being provided with a spray net 24, the spray net 24 being connected to a liquid storage tank of the tower body 21 through a circulation pipe. Connected; an adaptive slag removal structure 25 is disposed at the upper end of the liquid storage tank inside the tower body 21. The adaptive slag removal structure 25 includes an isolation seat 251 surrounding the inner wall of the tower body 21. An adjusting member 252 providing binding force is longitudinally installed on the inner side of the isolation seat 251. A floating member 253 is slidably installed on the outer side of the isolation seat 251. The bottom surface of the floating member 253 is in contact with the upper liquid surface of the liquid storage tank. The top surface of the floating member 253 communicates with an external discharge component 254. After the floating member 253 floats with the liquid surface, it is fixed by the adjusting member 252 and the crystals on the liquid surface are discharged by the external discharge component 254.

[0033] During the battery breakage process and the pyrolysis of the fragments, the electrolyte gas volatilized first enters the primary alkaline washing tower 10 and the secondary alkaline washing tower 20 for alkaline washing to remove hydrogen fluoride. Then, after being defoamed by the demister 30, it enters the activated carbon purifier 40 for purification to remove VOCs. The purified exhaust gas is then burned and discharged into the atmosphere.

[0034] In existing technologies, the fine crystals generated during the alkaline washing of waste gas are difficult to collect by the slag removal structure after formation. They are easily sprayed again by the circulation structure and then flow out from the top with the "clean gas," resulting in the fluorine in the discharged gas not being completely cleaned, which can easily affect the purity of the discharged gas. Therefore, this embodiment uses an adaptive slag removal structure 25 and a floating element 253 at the upper end of the storage tank. The floating element 253 can change with the liquid level in the storage tank, and the fine crystals floating on the liquid surface are sucked in by the discharge component 254 through the floating element 253. However, due to its adaptability, the floating element 253 is prone to fluctuation in position when sucking in crystals, which can easily lead to the omission of some crystals. Therefore, this invention also fixes the floating element 253 with an adjusting element 252 after the position is adjusted, so that the floating element 253 can maintain its stability when sucking crystals.

[0035] When the exhaust gas is first introduced, the air intake grille 22 can evenly disperse the exhaust gas and allow it to rise to contact the packing. However, during alkaline washing, some of the generated crystals fall onto the air intake grille 22, which not only easily obstructs the air intake but also allows the sprayed liquid to come into contact with the crystals multiple times. Therefore, in this embodiment, the air intake grille 22 includes a receiving frame 221 installed inside the tower body 21. A rotating cage 222 is installed on the receiving frame 221. Several air intake nets 223 are provided on the inner side of the rotating cage 222, and an inner rotating frame 224 is provided on the outer side of the rotating cage 222. The rotating cage 222 is placed on the receiving frame 221, so that the incoming exhaust gas drives the rotating cage 222 to rotate through the inner rotating frame 224. This allows the crystals that fall onto the air intake nets 223 to continuously tumble until they fall into the liquid storage tank, thereby improving the air intake efficiency and liquid return efficiency.

[0036] Although the adjusting component 252 is not a precision electronic component, direct contact with hydrogen fluoride should be avoided as much as possible in an environment with hydrogen fluoride gas. Therefore, the isolation seat 251 in this embodiment includes several L-shaped plates 2511 fixed to the inner wall of the tower body 21. The several L-shaped plates 2511 form a circular structure. A movable slit 2512 is opened on the inner side of the L-shaped plate 2511. The floating component 253 is slidably disposed in the movable slit 2512. The adjusting component 252 is disposed inside the isolation seat 251. The L-shaped plates 2511 of the isolation seat 251 cover the adjusting component 252 and guide the liquid after spraying, leaving only a movable slit 2512 for the floating component 253 to pass through.

[0037] Because it is in a corrosive environment, it is not suitable to set up a lot of power structures, otherwise it will be very easy to be affected by acidic conditions. However, without a fixed structure, the overall structure will inevitably become unstable due to the back suction force during suction. Therefore, the adjusting member 252 in this embodiment includes a power supply 2521 set inside the isolation seat 251. An electromagnet 2522 is set on the output end of the power supply 2521. The adjusting member 252 is a simple power supply 2521 with an electromagnet 2522, which can be energized when in use and is not afraid of acid mist corrosion when not in use. In this embodiment, the power supply 2521 is only a simple circuit structure and has been treated with anti-corrosion.

[0038] To ensure the effective cooperation between the electromagnet 2522 and the floating component 253 and to prevent disengagement during single-point cooperation, the electromagnet 2522 is specifically designed as a longitudinal elongated structure, which allows the floating component 253 to cooperate with the electromagnet 2522 regardless of its position.

[0039] The height of the spray liquid varies in different devices, and the liquid level changes in real time. Installers cannot predict the liquid level during use during the installation phase. Therefore, the floating component 253 in this embodiment includes a movable shaft 2531 that slides up and down within the movable joint 2512. An adsorption magnet 2532 is provided at the end of the movable shaft 2531 near the adjusting component 252, and an extension shaft 2533 is provided at the end of the movable shaft 2531 away from the adjusting component 252. The extension shaft 2533 is hollow, and a floating suction device 2534 is provided at the bottom of the extension shaft 2533. The floating component 253 is configured as a floating suction device 2534 with buoyancy, which can float on the upper part of the spray liquid and change with the liquid level. When suction is required, it is fixed by the cooperation of the adjusting component 252 and the adsorption magnet 2532, thereby forming a stable structure and ensuring the effect of suction crystallization.

[0040] Because the entire floating suction device 2534 needs to float on the spray liquid and also needs to have a suction effect, the floating suction device 2534 in this embodiment includes a suction box 25341 disposed at the lower end of the extension shaft 2533. A floating plate 25342 is disposed at the bottom of the suction box 25341. The inlet of the suction box 25341 is in contact with the liquid surface of the storage tank. The floating suction device 2534 not only has a suction box 25341, but also needs to be provided with a floating plate 25342 at the bottom of the suction box 25341. The floating plate 25342 is used to float the entire floating suction device 2534 on the spray liquid.

[0041] In order to make way for the floating plate 25342, the suction box 25341 has a Z-shaped structure, and the inner side of the suction box 25341 can make way for the floating plate 25342.

[0042] When the external discharge component 254 is discharging, only the front half needs to be movable, while the rear half can be fixed. Specifically, the external discharge component 254 includes an elastic conduit 2541 disposed on the top of the floating component 253. The other end of the elastic conduit 2541 is connected to a fixed pipe 2542. The fixed pipe 2542 extends to the outside of the tower body 21 and is connected to the external negative pressure suction structure. The design of the elastic conduit 2541 allows the floating component 253 to have a certain degree of mobility when moving up and down.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A multi-stage exhaust gas treatment system for battery recycling, characterized in that, include: A primary alkaline scrubbing tower (10) for receiving tail gas, the outlet of the primary alkaline scrubbing tower (10) is connected to a secondary alkaline scrubbing tower (20), the outlet of the secondary alkaline scrubbing tower (20) is connected to a demister (30), and the gas passing through the demister (30) is output to an activated carbon purifier (40) for purification; the secondary alkaline scrubbing tower (20) includes a tower body (21) for alkaline scrubbing, one end of the tower body (21) is provided with an inlet end (23) including an inlet grille (22), the... A spray net (24) is provided at the upper end of the air intake grille (22). The spray net (24) is connected to the liquid storage tank of the tower body (21) through a circulation pipe. The air intake grille (22) includes a receiving frame (221) installed on the inner side of the tower body (21). A rotating cage (222) is provided on the receiving frame (221). Several air intake nets (223) are provided on the inner side of the rotating cage (222). An inner rotating frame (224) is provided on the outer side of the rotating cage (222). An adaptive slag removal structure (25) is installed at the upper end of the liquid storage tank inside the tower body (21). The adaptive slag removal structure (25) includes an isolation seat (251) surrounding the inner wall of the tower body (21). An adjusting member (252) that provides binding force is longitudinally installed on the inner side of the isolation seat (251). A floating member (253) is slidably installed on the outer side of the isolation seat (251). The bottom surface of the floating member (253) is in contact with the upper liquid surface of the liquid storage tank. The top surface of the floating member (253) is connected to an external discharge assembly (254). The floating member (253) floats with the liquid surface. Then, it is fixed by the adjusting member (252), and the crystals on the liquid surface are discharged by the discharge assembly (254). The isolation seat (251) includes several L-shaped plates (2511) fixed to the inner wall of the tower body (21). The several L-shaped plates (2511) form a circular structure. A movable slot (2512) is opened on the inner side of the L-shaped plate (2511). The floating member (253) is slidably disposed in the movable slot (2512). The adjusting member (252) includes a power supply (2521) disposed on the inner side of the isolation seat (251). The power supply (2521) An electromagnet (2522) is provided on the output end of the 521), and the floating component (253) includes a movable shaft (2531) that slides up and down in the movable slot (2512). An adsorption magnet (2532) is provided at the end of the movable shaft (2531) near the adjusting component (252), and an extension shaft (2533) is provided at the end of the movable shaft (2531) away from the adjusting component (252). The extension shaft (2533) is hollow, and a floating suction device (2534) is provided at the bottom of the extension shaft (2533). The floating suction device (2534) is... 534) includes a suction box (25341) disposed at the lower end of the extension shaft (2533), a floating plate (25342) is disposed at the bottom of the suction box (25341), the inlet of the suction box (25341) is in contact with the liquid surface of the storage tank, the external discharge assembly (254) includes an elastic conduit (2541) disposed at the top of the floating part (253), the other end of the elastic conduit (2541) is connected to a fixed pipe (2542), the fixed pipe (2542) extends to the outside of the tower body (21) and is connected to the external negative pressure suction structure.

2. The multi-stage battery recycling exhaust gas treatment system according to claim 1, characterized in that, The electromagnet (2522) is a longitudinal strip structure.

3. The multi-stage battery recycling exhaust gas treatment system according to claim 1, characterized in that, The suction box (25341) has a Z-shaped structure.

Images