Tail gas recovery tower for preparing NMP

Abstract

A tail gas recovery tower for NMP preparation is characterized by comprising a bottom frame, a gas inlet pipe is arranged on the bottom frame, a supporting plate is arranged on the bottom frame, a waterproof motor is arranged on the supporting plate, a rotating shaft is arranged below the waterproof motor, a disturbance plate is arranged on the rotating shaft, a middle-layer frame is arranged on the bottom frame, and a spraying head is arranged on the middle-layer frame. NMP waste gas enters treatment liquid of the bottom frame from the gas inlet pipe, an external controller controls a waterproof motor to drive a rotating shaft to rotate, so that a plurality of disturbance plates are driven to rotate, the NMP waste gas in the bottom frame is driven to be uniformly distributed, the NMP waste gas continues to flow upwards, and at the moment, water is supplied to a plurality of spraying heads through an external water supply pipe to perform uniform spraying; the NMP waste gas can be effectively dissolved, residual gas passes through the demisting net and the water absorption layer to remove moisture, is discharged from the exhaust port and is collected, uniform spraying is achieved, meanwhile, the structure is simple, replacement and repair are convenient when maintenance or damage is needed, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of NMP recovery, in particular to a tail gas recovery tower used for NMP preparation. Background Art

[0002] N-Methylpyrrolidone, or NMP, is an important chemical raw material. It is a polar solvent with strong selectivity and good stability. It is also a commonly used solvent in the production process of lithium batteries. In the production process of lithium batteries, NMP is often used as a solvent when making positive and negative electrode materials and lithium battery separators. During the production process, with the production of positive and negative electrode materials and separators of lithium batteries, the NMP solvent used is constantly volatilized and will be discharged with the waste gas. The waste gas containing NMP has certain toxicity and cannot be directly discharged into the environment. It needs to be recycled before it can be discharged.

[0003] There is an existing NMP waste gas recovery device CN217855452U, which includes a spray tower with an air inlet pipe on one side and an exhaust pipe on the top. A cooling water tank connected to the spray tower through a connecting pipe is provided on one side of the spray tower. A water pump for extracting cooling water from the cooling water tank is provided on the top of the cooling water tank. The water outlet of the water pump is connected to a water pipe. The inside of the spray tower is provided with a second spray pipe and a first spray pipe with nozzles evenly provided at the bottom from top to bottom. The first spray pipe and the second spray pipe are both connected to the water pipe, and the first spray pipe can be driven to swing by a swing mechanism. The NMP waste gas recovery device can make the first spray pipe swing and spray back and forth by setting a swing mechanism, and cooperate with the second spray pipe to ensure uniform spraying, so that the NMP waste gas can be effectively dissolved;

[0004] However, the equipment has a complex structure and is inconvenient to replace and repair when it needs to be overhauled or damaged. To solve the above problems, a tail gas recovery tower for NMP preparation is proposed. Utility Model Content

[0005] According to the above existing technical problems, the utility model provides a tail gas recovery tower for NMP preparation, which is characterized by comprising a base frame, an air inlet pipe, a support plate, a waterproof motor, a rotating shaft, a disturbance plate, a middle frame, a cross plate, a spray head, an upper frame, a demisting net, a water absorption layer, and an exhaust port, wherein the base frame is provided with an air inlet pipe, the base frame is provided with a support plate, the support plate is provided with a waterproof motor, the waterproof motor is provided with a rotating shaft below, the rotation shaft is provided with a disturbance plate, the base frame is provided with a middle frame, the middle frame is provided with a cross plate, the cross plate is provided with a spray head, the middle plate is provided with an upper plate, the upper plate is provided with a demisting net inside the upper plate, the water absorption layer is provided above the demisting net, and the upper frame is provided with an exhaust port;

[0006] Further, the air inlet pipe is connected to an external NMP preparation device, a support leg is provided under the base frame, an empty slot is provided in the base frame, the support plate is fixedly arranged on the side wall of the empty slot of the base frame, the waterproof motor is fixedly arranged on the support plate, the waterproof motor is connected to an external controller, the rotating shaft is connected to the output end of the waterproof motor and is driven by the waterproof motor, and there are multiple disturbance plates, which are evenly and fixedly distributed on the rotating shaft;

[0007] Furthermore, the middle frame has a through opening, the bottom of the middle frame has a convex ring, the middle frame is connected to the bottom frame through the convex ring, the convex ring of the middle frame has a sealing ring, the cross plate is fixedly arranged on the top of the middle frame opening, and there are a plurality of spray heads, which are evenly distributed on the lower surface of the cross plate and connected to the external water supply pipe;

[0008] Furthermore, the upper frame has a through opening, the bottom of the upper frame has a convex ring, the upper frame is connected to the middle frame via the convex ring, the convex ring of the upper frame has a sealing ring, the demisting net is fixedly arranged in the opening of the upper frame, the demisting net has a number of small gaps, and the water absorption layer is fixedly arranged in the opening of the upper frame and above the demisting net.

[0009] Beneficial effects of the utility model:

[0010] The utility model allows NMP waste gas to enter the treatment liquid of the bottom frame from the air inlet pipe, and an external controller controls a waterproof motor to drive the rotating shaft to rotate, thereby driving a plurality of disturbance plates to rotate, driving the NMP waste gas in the bottom frame to be evenly distributed, and the NMP waste gas continues to flow upward. At this time, a plurality of spray heads are supplied with water by an external water supply pipe to perform uniform spraying, so that the NMP waste gas can be effectively dissolved, and the remaining gas passes through a demisting net and a water absorption layer to remove moisture, and is discharged from an exhaust port and collected. While achieving uniform spraying, the utility model has a simple structure, is convenient to replace and repair when maintenance is required or damaged, and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the overall structure of a tail gas recovery tower for NMP preparation according to the utility model;

[0012] Figure 2 This is a schematic diagram of the explosion structure of a tail gas recovery tower for NMP preparation according to the utility model;

[0013] Figure 3 This is a schematic diagram of the base frame structure of a tail gas recovery tower for NMP preparation according to the utility model;

[0014] Figure 4 This is a schematic diagram of the middle frame structure of a tail gas recovery tower for NMP preparation in the utility model;

[0015] Figure 5 This is a schematic diagram of the upper frame structure of a tail gas recovery tower for NMP preparation according to the utility model;

[0016] As shown in the figure: 1 bottom frame, 2 air inlet pipe, 3 support plate, 4 waterproof motor, 5 rotating shaft, 6 disturbance plate, 7 middle frame, 8 cross plate, 9 spray head, 10 upper frame, 11 demisting net, 12 water absorption layer, 13 exhaust port. DETAILED DESCRIPTION

[0017] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0019] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0020] Example 1

[0021] The utility model provides a tail gas recovery tower for NMP preparation, which is characterized by comprising a base frame 1, an air inlet pipe 2, a support plate 3, a waterproof motor 4, a rotating shaft 5, a disturbance plate 6, a middle frame 7, a cross plate 8, a spray head 9, an upper frame 10, a demisting net 11, a water absorbing layer 12, and an exhaust port 13. The base frame 1 is provided with the air inlet pipe 2, the base frame 1 is provided with the support plate 3, the waterproof motor 4 is provided on the support plate 3, the waterproof motor 4 is provided below the rotating shaft 5, the disturbance plate 6 is provided on the rotating shaft 5, the base frame 1 is provided with the middle frame 7, the middle frame 7 is provided with the cross plate 8, the spray head 9 is provided on the cross plate 8, the upper plate is provided on the middle plate, the demisting net 11 is provided inside the upper plate, the water absorbing layer 12 is provided above the demisting net 11, and the exhaust port 13 is provided on the upper frame 10;

[0022] Further, the air inlet pipe 2 is connected to the external NMP preparation device, a support leg is provided below the base frame 1, an empty slot is provided in the base frame 1, a support plate 3 is fixedly provided on the side wall of the empty slot of the base frame 1, a waterproof motor 4 is fixedly provided on the support plate 3, the waterproof motor 4 is connected to the external controller, a rotating shaft 5 is connected to the output end of the waterproof motor 4, and is driven by the waterproof motor 4, and a plurality of disturbance plates 6 are provided, and are evenly and fixedly distributed on the rotating shaft 5;

[0023] Furthermore, there is a through opening in the middle frame 7, a convex ring is provided at the bottom of the middle frame 7, the middle frame 7 is connected to the bottom frame 1 through the convex ring, a sealing ring is provided inside the convex ring of the middle frame 7, a cross plate 8 is fixedly arranged at the top of the opening of the middle frame 7, and there are a plurality of spray heads 9, which are evenly distributed on the lower surface of the cross plate 8 and connected to the external water supply pipe;

[0024] Furthermore, there is a through opening in the upper frame 10, a convex ring is provided at the bottom of the upper frame 10, the upper frame 10 is connected to the middle frame 7 through the convex ring, a sealing ring is provided in the convex ring of the upper frame 10, a demisting net 11 is fixedly arranged in the opening of the upper frame 10, a plurality of small gaps are provided on the demisting net 11, and a water absorbing layer 12 is fixedly arranged in the opening of the upper frame 10 and above the demisting net 11.

[0025] Example 2

[0026] When in use, the base frame 1 is filled with a treatment liquid, the height of the treatment liquid is higher than the height of the air inlet pipe 2, and the NMP waste gas enters the treatment liquid of the base frame 1 from the air inlet pipe 2. The external controller controls the waterproof motor 4 to drive the rotating shaft 5 to rotate, thereby driving a plurality of disturbance plates 6 to rotate, driving the NMP waste gas in the base frame 1 to be evenly distributed, and the NMP waste gas continues to flow upward. At this time, a plurality of spray heads 9 are supplied with water by an external water supply pipe to perform uniform spraying, so that the NMP waste gas can be effectively dissolved, and the remaining gas passes through the demisting net 11 and the water absorption layer 12 to remove moisture, and is discharged from the exhaust port 13 and collected, thereby completing the recovery of the tail gas prepared by NMP.

[0027] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. The various components mentioned in the utility model are common technologies in the existing field. The technicians in this industry should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only to illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A tail gas recovery tower for NMP preparation, characterized in that It includes a base frame, an air inlet pipe is arranged on the base frame, a support plate is arranged on the base frame, a waterproof motor is arranged on the support plate, a rotating shaft is arranged below the waterproof motor, a disturbance plate is arranged on the rotating shaft, a middle frame is arranged on the base frame, a cross plate is arranged on the middle frame, a spray head is arranged on the cross plate, an upper frame is arranged on the middle frame, a demisting net is arranged in the upper frame, a water absorption layer is arranged above the demisting net, and an exhaust port is arranged on the upper frame.

2. A tail gas recovery tower for NMP preparation according to claim 1, characterized in that, The air inlet pipe is connected to an external NMP preparation device, a support leg is provided under the base frame, an empty slot is provided in the base frame, the support plate is fixedly provided on the side wall of the empty slot of the base frame, the waterproof motor is fixedly provided on the support plate, the waterproof motor is connected to an external controller, the rotating shaft is connected to the output end of the waterproof motor and is driven by the waterproof motor, and there are multiple disturbance plates, which are evenly and fixedly distributed on the rotating shaft.

3. A tail gas recovery tower for NMP preparation according to claim 2, characterized in that, There is a through opening in the middle frame, a convex ring is provided at the bottom of the middle frame, the middle frame is connected to the bottom frame through the convex ring, a sealing ring is provided in the convex ring of the middle frame, the cross plate is fixedly arranged on the top of the opening of the middle frame, there are several spray heads, which are evenly distributed on the lower surface of the cross plate and are connected to the external water supply pipe.

4. A tail gas recovery tower for NMP preparation according to claim 3, characterized in that, The upper frame has a through opening, the bottom of the upper frame has a convex ring, the upper frame is connected to the middle frame through the convex ring, the convex ring of the upper frame has a sealing ring, the demisting net is fixedly arranged in the opening of the upper frame, the demisting net has a plurality of small gaps, and the water absorption layer is fixedly arranged in the opening of the upper frame and above the demisting net.

Images