NMP-containing tail gas recovery device

Abstract

The utility model discloses an NMP (N-Methyl Pyrrolidone)-containing tail gas recovery device, which belongs to the technical field of tail gas recovery and comprises a box body, mutually connected arc-shaped filter screens are fixedly mounted on two sides of the top end in the box body, a rotating shaft is movably connected to the middle of the lower part of each arc-shaped filter screen through a bearing, and a scraper is arranged on the periphery of each rotating shaft. The tail ends of the scraping plates make contact with the surfaces of the bottoms of the arc-shaped filter screens, a sedimentation tank is arranged at the bottom of the box body, a flow guide cover is arranged above the sedimentation tank, an air guide opening is formed in the top of the flow guide cover, and the air guide opening extends to the position under the connecting position of the two arc-shaped filter screens. The rotating shaft and the scraping plate are arranged below the arc-shaped filter screen, the flow guide cover is used for gathering precipitated gas, and the gas is blown to the scraping plate on one side through the gas guide opening, so that the scraping plate and the rotating shaft are driven to rotate, the rotating scraping plate is used for scraping the surface of the arc-shaped filter screen, and the situation that the arc-shaped filter screen is used for a long time, many attachments are caused, and blockage is caused is avoided; the filtering efficiency is influenced.

Description

Technical Field

[0001] This utility model belongs to the field of exhaust gas recovery technology, specifically relating to an exhaust gas recovery device containing NMP. Background Technology

[0002] In the lithium battery production process, NMP is an important auxiliary material used to fuse various electrode materials, such as positive electrode binders, active materials, and conductive agents, together, ensuring that the binder is in full contact with other substances and is evenly distributed. However, NMP is highly volatile and has certain impacts on the environment and human health, therefore it needs to be treated and recycled. NMP, or N-methylpyrrolidone, is an organic compound with the chemical formula C5H9NO. It is a colorless to pale yellow transparent liquid with a slight ammonia odor. It is miscible with water in any proportion and soluble in ether, acetone, esters, halogenated hydrocarbons, aromatic hydrocarbons, and various other organic solvents, and is almost completely mixed with all solvents.

[0003] Currently, existing NMP-containing exhaust gas recovery devices filter the gas. However, due to prolonged use, a large amount of dust accumulates on the surface of the filter plates, causing them to become clogged and reducing the filtration effect and efficiency. Furthermore, the filter plates are installed inside the device, making them difficult to disassemble and clean, which makes the filter plate clogging problem difficult to solve. Therefore, we propose an NMP-containing exhaust gas recovery device. Utility Model Content

[0004] The purpose of this invention is to provide an NMP-containing exhaust gas recovery device to solve the existing problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an NMP exhaust gas recovery device, comprising a housing, an arc-shaped filter screen, and a scraper. The inner top of the housing has two interconnected arc-shaped filter screens fixedly installed on both sides. The outer periphery of the arc-shaped filter screen is fixedly and sealed to the inner wall of the housing. A rotating shaft is movably connected to the lower center of the arc-shaped filter screen via a bearing. A scraper is provided around the outer periphery of the rotating shaft, with the end of the scraper contacting the bottom surface of the arc-shaped filter screen. A sedimentation tank is provided at the bottom of the housing, and a flow guide hood is fixedly installed above the sedimentation tank. An air guide port is opened at the top of the flow guide hood, extending directly below the connection point of the two arc-shaped filter screens.

[0006] Preferably, the top two sides of the flow guide shroud are provided with outer inclined surfaces, and a return groove is provided at the lowest point of the outer inclined surface. The return groove passes through the flow guide shroud and connects to the top of both ends of the sedimentation tank.

[0007] Preferably, a connecting pipe is fixedly installed in the middle of the inner part of the box, and a nozzle is inclined on one side of the connecting pipe, with the nozzle inclined towards the outward slope. An external water pipe is provided on one side of the middle of the outer part of the box, and the external water pipe is sealed and connected to the connecting pipe.

[0008] Preferably, a through groove is formed on the surface of the scraper near the rotating shaft, and the through groove extends through both sides of the scraper.

[0009] Preferably, a fan is fixedly installed at the bottom of one side of the outer side of the box, the fan is provided with an air inlet pipe at the air inlet end, the fan is sealed and connected to an air guide pipe at the exhaust end, the air guide pipe extends to the bottom of the internal liquid surface of the sedimentation tank, and a check valve is provided at the top of the air guide pipe.

[0010] Preferably, a drain outlet is provided at the bottom of the outer side of the box away from the air inlet pipe, the drain outlet is connected to the bottom of the sedimentation tank, and a valve body is provided inside the drain outlet.

[0011] Preferably, an exhaust port is provided at the center of the top of the box, and the exhaust port is connected to the top of the inside of the box.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. By improving the traditional filter plate into an arc-shaped filter screen and setting a rotating shaft and scraper below it, the gas after sedimentation is gathered by the guide hood and blown to the scraper on one side through the air inlet, thereby driving the scraper and rotating shaft to rotate. The rotating scraper scrapes the surface of the arc-shaped filter screen, avoiding the situation where there are too many deposits after long-term use, causing blockage and affecting the filtration efficiency.

[0014] 2. By setting a channel on one side of the scraper to facilitate the discharge of scraped-off deposits, and by using a spray nozzle to rinse the outer slope, the deposits that fall onto its surface are washed away and fall into the sedimentation tank through the return trough for centralized collection and treatment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a multi-angle structural schematic diagram of the present invention;

[0017] Figure 3 This is a schematic diagram of the bottom structure of the air guide cover of this utility model.

[0018] In the diagram: 1. Housing; 2. Air inlet pipe; 3. Fan; 4. Air guide pipe; 5. Check valve; 6. Sedimentation tank; 7. Drain outlet; 8. Flow guide hood; 9. Air guide port; 10. Outer slope; 11. Falling trough; 12. Arc-shaped filter screen; 13. Rotating shaft; 14. Scraper; 15. Through groove; 16. Exhaust outlet; 17. Connecting pipe; 18. Nozzle; 19. External water pipe. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-3 This utility model provides a technical solution for an NMP exhaust gas recovery device: it includes a housing 1, an arc-shaped filter screen 12, and a scraper 14. The arc-shaped filter screens 12 are fixedly installed on both sides of the top of the housing 1. The outer periphery of the arc-shaped filter screen 12 is fixed and sealed to the inner wall of the housing 1. A rotating shaft 13 is movably connected to the lower middle part of the arc-shaped filter screen 12 through a bearing. A scraper 14 is provided around the outer periphery of the rotating shaft 13. The end of the scraper 14 contacts the bottom surface of the arc-shaped filter screen 12. A sedimentation tank 6 is provided at the bottom of the housing 1. A flow guide hood 8 is fixedly installed above the sedimentation tank 6. An air guide port 9 is opened at the top of the flow guide hood 8 and extends to directly below the connection point of the two arc-shaped filter screens 12.

[0021] Specifically, the top two sides of the flow guide hood 8 are provided with outer inclined surfaces 10, and the lowest point of the outer inclined surface 10 is provided with a return groove 11, which passes through the flow guide hood 8 and connects to the top of both ends of the sedimentation tank 6.

[0022] Specifically, a connecting pipe 17 is fixedly installed in the middle of the interior of the housing 1. A nozzle 18 is inclined on one side of the connecting pipe 17 and faces the outward inclined surface 10. An external water pipe 19 is installed on one side of the middle of the exterior of the housing 1. The external water pipe 19 is sealed and connected to the connecting pipe 17.

[0023] Specifically, a through groove 15 is provided on the surface of the scraper 14 near the rotating shaft 13, and the through groove 15 extends through both sides of the scraper 14.

[0024] Specifically, a blower 3 is fixedly installed on the bottom of one side of the outer side of the box 1. An air inlet pipe 2 is provided at the air inlet end of the blower 3. An air guide pipe 4 is sealed and connected to the exhaust end of the blower 3. The air guide pipe 4 extends to the bottom of the liquid surface inside the sedimentation tank 6. A check valve 5 is provided at the top of the air guide pipe 4.

[0025] Specifically, a drain outlet 7 is provided at the bottom of the outer side of the box 1 away from the air inlet pipe 2. The drain outlet 7 is connected to the bottom of the sedimentation tank 6. A valve body is provided inside the drain outlet 7.

[0026] Specifically, an exhaust port 16 is provided at the center of the top of the housing 1, and the exhaust port 16 is connected to the top of the interior of the housing 1.

[0027] In this embodiment, during use, the cooled exhaust gas passes through the inlet pipe 2 and, under the action of the fan 3, is introduced into the sedimentation tank 6 at the bottom of the housing 1. The gas is then injected below the liquid surface inside the sedimentation tank 6 via the air guide pipe 4, causing impurities and other particulate matter in the gas to settle inside the sedimentation tank 6. The settled gas then flows through the guide hood 8 to the air guide port 9 at its top, and is blown through the air guide port 9 onto the scraper 14 below the arc-shaped filter screen 12. The wind power drives the scraper 14, causing the rotating shaft 13 to rotate, allowing the scraper 14 on the rotating shaft 13 to... During the rotation process, the arc-shaped filter screen 12 is scraped off, and the impurities that are deposited on the surface of the arc-shaped filter screen 12 are hung off and floated down through the channel 15. At the same time, external water is drawn from the external water source through the external water pipe 19 and injected into the nozzle 18 through the connecting pipe 17. The nozzle 18 is used to treat the dust and wash the impurities that fall onto the outer inclined surface 10, so that they fall into the interior of the sedimentation tank 6 with the water flow. The treated gas is discharged from the box 1 through the exhaust port 16, and the sewage in the sedimentation tank 6 is discharged through the sewage outlet 7.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A NMP tail gas containing recovery device comprising a box (1), an arc-shaped filter screen (12) and a scraper (14), characterized in that: The inside top end of the box (1) is fixedly provided with two arc-shaped filter screens (12) connected with each other, the outer periphery of the arc-shaped filter screen (12) is fixedly and sealingly connected with the inner wall of the box (1), the lower middle position of the arc-shaped filter screen (12) is movably connected with a rotating shaft (13) through a bearing, the outer periphery of the rotating shaft (13) is provided with a peripheral scraper (14), the end of the scraper (14) is in contact with the bottom surface of the arc-shaped filter screen (12), the bottom of the box (1) is provided with a sedimentation tank (6), the upper portion of the sedimentation tank (6) is fixedly provided with a flow guide cover (8), the top of the flow guide cover (8) is provided with a gas guide opening (9), and the gas guide opening (9) extends to the position directly below the connecting portion of the two arc-shaped filter screens (12).

2. The NMP off-gas containing recovery apparatus according to claim 1, characterized by: The top of the flow guide cover (8) is provided with an outer inclined surface (10) on each side, the lowest position of the outer inclined surface (10) is provided with a falling groove (11), and the falling groove (11) penetrates the flow guide cover (8) and communicates with the upper portions of the two ends of the sedimentation tank (6).

3. The NMP off-gas containing recovery apparatus according to claim 1, characterized in that: The inside middle end of the box (1) is fixedly provided with a communication pipe (17), one side of the communication pipe (17) is obliquely provided with a spray head (18), the spray head (18) is obliquely directed to the outer inclined surface (10), and the outside middle end of the box (1) is provided with an external water pipe (19) on one side.

4. The NMP off-gas containing recovery apparatus according to claim 1, characterized by: The surface of one side of the scraper (14) close to the rotating shaft (13) is provided with a through groove (15), and the through groove (15) penetrates the two sides of the scraper (14).

5. The NMP off-gas containing recovery apparatus according to claim 1, characterized by: The bottom end of one side of the box (1) is fixedly provided with a fan (3), the air inlet end of the fan (3) is provided with an air inlet pipe (2), the air outlet end of the fan (3) is sealingly communicated with a gas guide pipe (4), the gas guide pipe (4) extends to the position below the liquid level in the sedimentation tank (6), and the top end of the gas guide pipe (4) is provided with a check valve (5).

6. The NMP off-gas containing recovery apparatus according to claim 1, characterized by: The bottom end of one side of the box (1) away from the air inlet pipe (2) is provided with a blow-off port (7), the blow-off port (7) is in communication with the inside bottom end of the sedimentation tank (6), and the inside of the blow-off port (7) is provided with a valve body.

7. The NMP off-gas recovery unit of claim 1, wherein: The top center position of the box (1) is provided with an air outlet (16), and the air outlet (16) is in communication with the inside top end of the box (1).

Images