Lithium battery coating machine NMP waste gas waste heat recoverer with purification function

Abstract

The utility model relates to a lithium battery coater NMP waste gas waste heat recoverer with a purification function, which comprises a gas inlet pipeline, a waste heat recovery box body, a connecting pipeline, a purification box body and a gas outlet pipeline, the gas inlet pipeline is communicated with one side of the waste heat recovery box body, one end of the connecting pipeline is communicated with the other side of the waste heat recovery box body, and the other end of the purification box body is communicated with the gas outlet pipeline. The other end of the connecting pipeline is communicated with one side of the purifying box body, and the other side of the purifying box body is communicated with the air outlet pipeline; a condensation pipeline is arranged in the waste heat recovery box body, the liquid inlet end of the condensation pipeline is installed on the top of the waste heat recovery box body, the liquid outlet end of the condensation pipeline is installed on the side wall of the waste heat recovery box body, and a liquid recovery assembly is arranged at the bottom of the waste heat recovery box body. An adsorption plate is arranged in the purification box body, and an adsorbent is arranged in the adsorption plate. By means of the treatment mode integrating condensation recovery and adsorption concentration, waste heat recovery in NMP waste gas is effectively achieved, recycling of heat resources is achieved, and meanwhile environmental pollution is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to a NMP waste gas waste heat recovery device for a lithium battery coating machine with a purification function. Background Art

[0002] NMP waste gas, i.e. industrial waste gas containing N-Methyl-2-pyrrolidone (NMP), mainly comes from the production process of semiconductor, chemical, electronic and other fields. Especially in the lithium-ion battery industry, NMP is often used as the main solvent of positive electrode slurry. In the coating, stirring, drying and other processes, NMP will evaporate in large quantities as the slurry dries, forming waste gas. NMP waste gas has certain toxicity, and long-term exposure may cause damage to the human nervous system, liver, etc.; NMP waste gas has high volatility and is easy to spread in the air, causing environmental pollution.

[0003] In the prior art, adsorption, combustion, catalytic oxidation and other methods are commonly used to treat NMP waste gas. The adsorption method uses an adsorbent to adsorb harmful substances in the waste gas to achieve the purpose of purification; the combustion method is to burn the harmful substances in the waste gas into carbon dioxide and water; the catalytic oxidation method uses a catalyst as a medium to oxidize the harmful substances in the waste gas into harmless substances.

[0004] However, NMP waste gas contains a lot of heat. In the prior art, it is inconvenient to recover the heat in the NMP waste gas when treating the NMP waste gas, resulting in a waste of heat resources. Utility Model Content

[0005] The purpose of the utility model is to provide a lithium battery coating machine NMP waste gas waste heat recovery device with a purification function to solve the technical problem that it is inconvenient to recover the heat in the NMP waste gas when treating the NMP waste gas in the prior art proposed in the above background technology, resulting in a waste of heat resources.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A NMP waste gas waste heat recovery device for a lithium battery coating machine with a purification function, comprising an air intake pipe, a waste heat recovery box, a connecting pipe, a purification box and an air outlet pipe;

[0008] The air inlet pipe is connected to one side of the waste heat recovery box, one end of the connecting pipe is connected to the other side of the waste heat recovery box, the other end of the connecting pipe is connected to one side of the purification box, and the other side of the purification box is connected to the air outlet pipe;

[0009] A condensation pipe is provided in the waste heat recovery box, the liquid inlet end of the condensation pipe is installed on the top of the waste heat recovery box, the liquid outlet end of the condensation pipe is installed on the side wall of the waste heat recovery box, and a liquid recovery component is provided at the bottom of the waste heat recovery box;

[0010] An adsorption plate is arranged in the purification box, and an adsorbent is arranged in the adsorption plate.

[0011] As a preferred solution, the condensation pipes are provided in a plurality of groups, two adjacent groups of the condensation pipes are interconnected, and two adjacent groups of the condensation pipes are parallel to each other, and each group of the condensation pipes is in a serpentine shape.

[0012] As a preferred solution, the liquid recovery component includes an installation groove, and inclined plates are symmetrically arranged on both sides of the installation groove. The inclined direction of the inclined plates is from the two sides of the waste heat recovery box body toward the installation groove, and a collection box is slidably installed in the installation groove.

[0013] As a preferred solution, water retaining strips are provided on both sides of the inclined plate.

[0014] As a preferred solution, guide slopes are provided on the tops of both sides of the collecting box.

[0015] As a preferred solution, a handle is provided at one end of the collection box.

[0016] It can be seen from the technical solution provided by the utility model that the utility model provides a lithium battery coating machine NMP waste heat recovery device with purification function, compared with the prior art, the beneficial effects are:

[0017] The waste gas containing NMP is recovered through the condensation pipe in the waste heat recovery box. At the same time, the temperature difference is used to convert most of the NMP from gas to liquid for recovery, thereby reducing the concentration of NMP in the waste gas. The remaining waste gas containing a small amount of NMP is further connected through the connecting pipe to the purification box equipped with an adsorbent (such as molecular sieve or modified activated carbon). The adsorbent can effectively adsorb NMP, and finally the waste gas is converted into tail gas that meets the emission standards and is discharged. This treatment method that integrates condensation recovery and adsorption concentration effectively realizes the recovery of waste heat in NMP waste gas, realizes the recycling of heat resources, and reduces environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the overall structure of a NMP waste heat recovery device for a lithium battery coating machine with a purification function provided in an embodiment of the utility model;

[0019] Figure 2 A schematic side view of the overall structure of a NMP waste heat recovery device for a lithium battery coating machine with a purification function provided in an embodiment of the utility model;

[0020] Figure 3 A schematic cross-sectional view of the internal structure of a NMP waste heat recovery device for a lithium battery coating machine with a purification function provided in an embodiment of the utility model;

[0021] Figure 4 The embodiment of the utility model provides Figure 3 A schematic diagram of the structure at the center part A;

[0022] Figure 5 A schematic diagram of the condensing pipeline structure of the NMP waste gas waste heat recovery device of a lithium battery coating machine with purification function provided in an embodiment of the utility model.

[0023] In the figure: 1. air inlet pipe; 2. waste heat recovery box; 21. condensation pipe; 211. liquid inlet end; 212. liquid outlet end; 22. inclined plate; 23. collection box; 24. water retaining bar; 25. guide slope; 26. handle; 3. connecting pipe; 4. purification box; 41. adsorption plate; 5. air outlet pipe. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0025] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0026] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0028] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] See also Figures 1 to 5 The embodiment of the present application provides a waste heat recovery device for NMP waste gas of a lithium battery coating machine with a purification function, comprising an air intake pipe 1, a waste heat recovery box 2, a connecting pipe 3, a purification box 4 and an air outlet pipe 5. The air intake pipe 1 is connected to one side of the waste heat recovery box 2, one end of the connecting pipe 3 is connected to the other side of the waste heat recovery box 2, the other end of the connecting pipe 3 is connected to one side of the purification box 4, and the other side of the purification box 4 is connected to the air outlet pipe 5; a condensation pipe 21 is provided in the waste heat recovery box 2, a liquid inlet end 211 of the condensation pipe 21 is installed on the top of the waste heat recovery box 2, a liquid outlet end 212 of the condensation pipe 21 is installed on the side wall of the waste heat recovery box 2, and a liquid recovery component is provided at the bottom of the waste heat recovery box 2; an adsorption plate 41 is provided in the purification box 4, and an adsorbent is provided in the adsorption plate 41.

[0030] Furthermore, the adsorbent may be a molecular sieve or activated carbon.

[0031] Working principle and effect: First, cold water is injected from the liquid inlet end 211 of the condensing pipe 21, so that the cold water fills the condensing pipe 21, and the waste gas containing NMP is discharged from the air inlet pipe 1 into the waste heat recovery box 2. When the NMP waste gas with heat contacts the condensing pipe 21, the heat is transferred to the cold water in the condensing pipe 21, so that the cold water is discharged from the liquid outlet of the condensing pipe 21 after heating, thereby collecting waste heat; secondly, when the NMP waste gas with heat contacts the condensing pipe 21, the NMP waste gas Condensed water droplets will be generated on the outer surface of the condensation pipe 21, and the condensed water droplets will drip into the liquid recovery component at the bottom of the waste heat recovery box 2, thereby converting most of the waste gas containing NMP into liquid; furthermore, the remaining part of the NMP waste gas enters the purification box 4 through the connecting pipe 3, and when the NMP waste gas passes through the adsorption plate 41 in the purification box 4, the NMP in the NMP waste gas can be absorbed by the adsorbent in the adsorption plate 41; finally, the exhaust gas after condensation and adsorption treatment is discharged through the outlet pipe 5.

[0032] Compared with the prior art, the waste gas containing NMP is recovered through the condensation pipe 21 in the waste heat recovery box 2. At the same time, the temperature difference is used to convert most of the NMP from gas to liquid for recovery, thereby reducing the NMP concentration in the waste gas. The remaining waste gas containing a small amount of NMP further enters the purification box 4 containing the adsorbent through the connecting pipe 3. The adsorbent can effectively adsorb NMP. Finally, the waste gas is converted into exhaust gas that meets the emission standards and is discharged. Through this treatment method that integrates condensation recovery and adsorption concentration, the waste heat in the NMP waste gas is effectively recovered, the recycling and utilization of heat resources are realized, and environmental pollution is reduced.

[0033] In one embodiment, Figure 5 As shown, there are multiple groups of condensing pipes 21, and two adjacent groups of condensing pipes 21 are interconnected and parallel to each other, and each group of condensing pipes 21 is in a serpentine shape. The multiple groups of condensing pipes 21 in a serpentine shape are arranged parallel to the side wall of the waste heat recovery box 2 (such as Figure 1 or Figure 3 As shown in the figure), when the exhaust gas enters the waste heat recovery box 2, the contact surface between the exhaust gas and the condensation pipe 21 can be increased, so that the effects of waste heat recovery and condensation can be increased.

[0034] In one embodiment, Figure 1 As shown, the liquid recovery assembly includes a mounting groove, and inclined plates 22 are symmetrically arranged on both sides of the mounting groove. The inclined direction of the inclined plates 22 is from the two sides of the waste heat recovery box 2 to the mounting groove, and a collection box 23 is slidably installed in the mounting groove. The waste gas is converted into liquid water droplets, which drip from the outer surface of the condensation pipe 21 onto the inclined plate 22, and flow into the collection box 23 through the inclined plate 22. The collection box 23 is slidably connected to the mounting groove, which is convenient for taking the collection box 23.

[0035] In one embodiment, Figure 1 or Figure 3 As shown, water retaining strips 24 are provided on both sides of the inclined plate 22. Water retaining strips 24 are provided on both sides of the inclined plate 22 to ensure that the water flow can flow into the collection box 23 completely.

[0036] In one embodiment, Figure 4 As shown, the tops of both sides of the collection box 23 are provided with guide slopes 25. The guide slopes 25 are provided to facilitate water flow into the collection box 23 from both sides.

[0037] In one embodiment, Figure 1 As shown, a handle 26 is provided at one end of the collection box 23. The handle 26 is provided to facilitate pulling the collection box 23.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A NMP waste gas waste heat recovery device for a lithium battery coating machine with purification function, characterized in that: It comprises an air intake pipe (1), a waste heat recovery box (2), a connecting pipe (3), a purification box (4) and an air outlet pipe (5); The air inlet pipe (1) is connected to one side of the waste heat recovery box (2), one end of the connecting pipe (3) is connected to the other side of the waste heat recovery box (2), the other end of the connecting pipe (3) is connected to one side of the purification box (4), and the other side of the purification box (4) is connected to the air outlet pipe (5); A condensation pipe (21) is provided in the waste heat recovery box (2), a liquid inlet end (211) of the condensation pipe (21) is installed on the top of the waste heat recovery box (2), a liquid outlet end (212) of the condensation pipe (21) is installed on the side wall of the waste heat recovery box (2), and a liquid recovery component is provided at the bottom of the waste heat recovery box (2); An adsorption plate (41) is provided in the purification box (4), and an adsorbent is provided in the adsorption plate (41).

2. The NMP waste gas waste heat recovery device for lithium battery coating machine with purification function according to claim 1 is characterized in that: The condensation pipes (21) are provided in a plurality of groups, two adjacent groups of the condensation pipes (21) are interconnected, and two adjacent groups of the condensation pipes (21) are parallel to each other, and each group of the condensation pipes (21) is in a serpentine winding shape.

3. The NMP waste gas waste heat recovery device for lithium battery coating machine with purification function according to claim 2 is characterized in that: The liquid recovery component comprises an installation groove, and inclined plates (22) are symmetrically arranged on both sides of the installation groove. The inclined direction of the inclined plates (22) is inclined from both sides of the waste heat recovery box (2) toward the installation groove, and a collection box (23) is slidably installed in the installation groove.

4. The NMP waste gas waste heat recovery device for lithium battery coating machine with purification function according to claim 3 is characterized in that: Water retaining strips (24) are provided on both sides of the inclined plate (22).

5. The NMP waste gas waste heat recovery device for lithium battery coating machine with purification function according to claim 4 is characterized in that: The tops of both sides of the collecting box (23) are provided with flow guiding inclined surfaces (25).

6. The NMP waste gas waste heat recovery device for lithium battery coating machine with purification function according to claim 5 is characterized in that: A handle (26) is provided at one end of the collection box (23).

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