NMP waste gas treatment device and coating and drying system

Abstract

The utility model relates to an NMP waste gas treatment device and a coating drying system, and belongs to the technical field of lithium battery production, the NMP waste gas treatment device comprises a box body, a plurality of spraying devices, a plurality of liquid storage tanks, a plurality of first pump bodies and a second pump body, the spraying devices are sequentially arranged in the box body at intervals, and the liquid storage tanks are arranged in the box body; liquid sprayed by the spraying devices absorbs NMP substances in NMP waste gas and then is converted into NMP waste liquid, the multiple liquid storage tanks are arranged at the bottoms of the multiple spraying devices in a one-to-one correspondence mode and used for collecting the NMP waste liquid, the concentration of the NMP waste liquid in the multiple liquid storage tanks is sequentially reduced in the preset horizontal direction, the first pump body is used for conveying the NMP waste liquid in the liquid storage tanks back to the spraying devices, and the second pump body is used for conveying the NMP waste liquid in the liquid storage tanks back to the spraying devices. And the second pump body is used for conveying the NMP waste liquid in the low-concentration liquid storage tank to the adjacent high-concentration liquid storage tank. According to the NMP waste gas treatment device and the coating drying system provided by the invention, recycling of NMP waste liquid is realized, the utilization rate of the NMP waste liquid is increased, and resource waste is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of lithium battery production, and in particular to an NMP waste gas treatment device and a coating and drying system. Background Art

[0002] In the field of lithium battery production and manufacturing technology, a large amount of high-temperature exhaust gas is generated during the coating and drying process of the positive electrode coating machine. The exhaust gas contains harmful volatile organic compounds such as NMP. Therefore, the NMP exhaust gas needs to be recovered and treated before being discharged into the air.

[0003] Existing coating and drying systems usually add a high tower or rotor equipment in addition to the coater, and use the absorption tower circulating spray method to absorb and treat NMP waste gas, which consumes a large amount of water resources and causes resource waste. Utility Model Content

[0004] Based on this, it is necessary to provide an NMP waste gas treatment device and a coating and drying system to solve the technical problem of resource waste in the coating and drying system in the prior art.

[0005] To this end, according to one aspect of the present application, there is provided an NMP waste gas treatment device, the NMP waste gas treatment device comprising:

[0006] The box body is provided with a gas channel along a preset horizontal direction, and the two ends of the gas channel along the preset horizontal direction are respectively an air inlet and an air outlet, and the gas channel is used for passing the NMP waste gas;

[0007] Multiple spray devices are arranged in sequence along a preset horizontal direction in the gas channel at intervals. The spray devices are arranged at the top of the gas channel. The liquid sprayed by the spray devices absorbs NMP substances in the NMP waste gas and converts it into NMP waste liquid;

[0008] Multiple liquid storage tanks are arranged at the bottom of the multiple spraying devices in a one-to-one correspondence, and the liquid storage tanks are used to collect NMP waste liquid. The concentration of the NMP waste liquid in the multiple liquid storage tanks decreases in sequence along a preset horizontal direction;

[0009] a plurality of first pump bodies, the number of which is the same as the number of the plurality of spraying devices, the first pump bodies being disposed between the corresponding spraying devices and the liquid storage tank, and the first pump bodies being used to transport the NMP waste liquid in the liquid storage tank back to the spraying devices; and

[0010] The second pump body is arranged between any two adjacent liquid storage tanks and is used to transport the NMP waste liquid in the low-concentration liquid storage tank to the adjacent high-concentration liquid storage tank.

[0011] Optionally, the NMP waste gas treatment device further comprises:

[0012] Multiple NMP concentration detection devices are disposed in the multiple liquid storage tanks in a one-to-one correspondence; and

[0013] The controller is communicatively connected to the NMP concentration detection device and the second pump body.

[0014] Optionally, the NMP waste gas treatment device further comprises:

[0015] Waste tanks; and

[0016] The third pump body is arranged between the waste liquid tank and the liquid storage tank at the head end along the preset horizontal direction, and the third pump body is communicatively connected to the controller.

[0017] Optionally, the NMP waste gas treatment device further includes a primary filter, which is arranged at the air inlet.

[0018] Optionally, the NMP waste gas treatment device further includes a wire mesh demister, which is arranged at the gas outlet.

[0019] Optionally, the NMP waste gas treatment device further includes two refrigerated surface coolers, which are respectively arranged at the air inlet and the air outlet.

[0020] Optionally, the NMP waste gas treatment device further includes a plurality of packing devices for adsorbing NMP substances, the number of the plurality of packing devices is consistent with the number of the plurality of spray devices, and the packing devices are arranged between the corresponding spray devices and the liquid storage tank.

[0021] Optionally, a baffle is provided on a side of the filler device close to the air inlet.

[0022] Optionally, the NMP waste gas treatment device further includes an activated carbon filter box, which is connected to the gas outlet.

[0023] According to another aspect of the present application, a coating and drying system is provided, which includes a coater, an air-to-air heat exchanger and the NMP waste gas treatment device as described above, wherein the coater, the air-to-air heat exchanger and the NMP waste gas treatment device are connected together in sequence.

[0024] The beneficial effects of the NMP waste gas treatment device and coating drying system provided in the present application are as follows: compared with the prior art, the NMP waste gas treatment device of the present application includes a box body, multiple spray devices, multiple liquid storage tanks, multiple first pump bodies and a second pump body, the multiple spray devices are arranged in sequence in the box body, and the multiple liquid storage tanks are arranged one-to-one at the bottom of the multiple spray devices. The first pump body is used to transport the NMP waste liquid in the liquid storage tank back to the spray device, thereby realizing the recycling of the NMP waste liquid and avoiding resource waste; the second pump body is used to transport the NMP waste liquid in the low-concentration liquid storage tank to the adjacent high-concentration liquid storage tank, thereby improving the utilization rate of the NMP waste liquid and further avoiding resource waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1 This is a schematic diagram of the main structure of the NMP waste gas treatment device provided in an embodiment of the present application;

[0027] Figure 2 This is a schematic diagram of the main structure of the coating and drying system provided in an embodiment of the present application.

[0028] Description of reference numerals:

[0029] 1. Box body; 110. Gas channel; 120. Air inlet; 130. Air outlet; 140. Inspection window; 2. Spraying device; 3. Liquid storage tank; 4. First pump body; 5. Second pump body; 6. NMP concentration detection device; 7. Waste liquid tank; 8. Third pump body; 9. Primary filter; 10. Wire mesh demister; 11. Refrigerated surface cooler; 12. Filling device; 13. Baffle; 14. Activated carbon filter box; 15. Exhaust fan; 16. Purified water pipeline

[0030] 100. NMP waste gas treatment device; 200. Coating machine; 300. Gas-to-gas heat exchanger. DETAILED DESCRIPTION

[0031] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0032] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 should not be understood as a limitation on the present application.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0034] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0035] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0037] According to one aspect of the present application, an embodiment of the present application provides an NMP waste gas treatment device 100, see Figure 1 The NMP waste gas treatment device 100 includes a housing 1, a plurality of spray devices 2, a plurality of liquid storage tanks 3, a plurality of first pump bodies 4 and a second pump body 5. The housing 1 is formed with a gas channel 110 along a preset horizontal direction. The two ends of the gas channel 110 along the preset horizontal direction are an air inlet 120 and an air outlet 130, respectively. The gas channel 110 is used to allow NMP waste gas to pass through; a plurality of spray devices 2 are arranged in sequence along a preset horizontal direction in the gas channel 110. The spray device 2 is arranged at the top of the gas channel 110. The liquid sprayed by the spray device 2 absorbs the NMP substance in the NMP waste gas and converts it into NMP waste gas. liquid; multiple liquid storage tanks 3 are arranged at the bottom of the multiple spraying devices 2 in a one-to-one correspondence, the liquid storage tanks 3 are used to collect NMP waste liquid, and the concentration of the NMP waste liquid in the multiple liquid storage tanks 3 decreases successively along the preset horizontal direction; the number of the multiple first pump bodies 4 is consistent with the number of the multiple spraying devices 2, the first pump body 4 is arranged between the corresponding spraying device 2 and the liquid storage tank 3, and the first pump body 4 is used to transport the NMP waste liquid in the liquid storage tank 3 back to the spraying device 2; the second pump body 5 is arranged between any two adjacent liquid storage tanks 3, and the second pump body 5 is used to transport the NMP waste liquid in the low-concentration liquid storage tank 3 to the adjacent high-concentration liquid storage tank 3.

[0038] In an embodiment of the present application, the NMP waste gas treatment device 100 includes a housing 1, multiple spray devices 2, multiple liquid storage tanks 3, multiple first pump bodies 4 and a second pump body 5. The multiple spray devices 2 are arranged in sequence in the housing 1, and the multiple liquid storage tanks 3 are arranged one by one at the bottom of the multiple spray devices 2. The first pump body 4 is used to transport the NMP waste liquid in the liquid storage tank 3 back to the spray device 2, thereby realizing the recycling of the NMP waste liquid and avoiding waste of resources; the second pump body 5 is used to transport the NMP waste liquid in the low-concentration liquid storage tank 3 to the adjacent high-concentration liquid storage tank 3, thereby improving the utilization rate of the NMP waste liquid and further avoiding waste of resources.

[0039] In one embodiment, see Figure 1The NMP waste gas treatment device 100 further includes a plurality of NMP concentration detection devices 6 and a controller. The plurality of NMP concentration detection devices 6 are arranged in a one-to-one correspondence in the plurality of liquid storage tanks 3. The controller is communicatively connected to the NMP concentration detection devices 6 and the second pump body 5 respectively.

[0040] Through the above arrangement, when the NMP concentration of the NMP waste liquid in the low-concentration liquid storage tank 3 reaches a preset value, the NMP concentration detection device 6 sends a signal to the controller. After receiving the signal, the controller controls the second pump body 5 to start, thereby realizing automatic concentration control.

[0041] In one embodiment, see Figure 1 The NMP waste gas treatment device 100 further includes a waste liquid tank 7 and a third pump body 8. The third pump body 8 is disposed between the waste liquid tank 7 and the liquid storage tank 3 at the head end along a preset horizontal direction. The third pump body 8 is communicatively connected to the controller.

[0042] Through the above configuration, when the NMP concentration of the NMP waste liquid in the liquid storage tank 3 at the head end reaches the maximum threshold, the controller controls the third pump body 8 to transport the high-concentration NMP waste liquid to the waste liquid tank 7 for storage, thereby timely reducing the NMP concentration of the NMP waste liquid in the liquid storage tank 3 and ensuring the NMP adsorption effect of the spray device 2.

[0043] In one embodiment, see Figure 1 The NMP waste gas treatment device 100 further includes a primary filter 9, which is disposed at the air inlet 120 and is used to intercept particulate matter in the NMP waste gas.

[0044] In one embodiment, see Figure 1 The NMP waste gas treatment device 100 further includes a wire mesh demister 10, which is disposed at the gas outlet 130. The primary filter 9 is used to intercept water droplets splashing in the NMP waste gas and reduce the humidity of the purified NMP waste gas.

[0045] In one embodiment, see Figure 1 The NMP waste gas treatment device 100 further includes two refrigerated surface coolers 11, which are respectively arranged at the air inlet 120 and the air outlet 130. The refrigerated surface coolers 11 are used to reduce the temperature of the NMP waste gas and condense NMP mist in the NMP waste gas.

[0046] In one embodiment, see Figure 1The NMP waste gas treatment device 100 also includes a plurality of packing devices 12 for adsorbing NMP substances. The number of the plurality of packing devices 12 is the same as the number of the plurality of spray devices 2. The packing devices 12 are arranged between the corresponding spray devices 2 and the liquid storage tank 3. The function of the packing devices 12 is to adsorb NMP substances in the NMP waste gas, and it also has a function of dispersing wind.

[0047] In one embodiment, see Figure 1 A baffle 13 is provided on one side of the packing device 12 close to the air inlet 120. The baffle 13 can intercept NMP droplets that are not dripped in time and mixed in the NMP exhaust gas, thereby achieving the purpose of isolating the spray droplets in different concentration ranges.

[0048] In one embodiment, see Figure 1 The NMP waste gas treatment device 100 further includes an activated carbon filter box 14, which is connected to the gas outlet 130. The activated carbon filter box 14 is used to adsorb trace tail gas in the treated NMP waste gas to ensure that the treated NMP waste gas meets environmental emission standards.

[0049] In one embodiment, see Figure 1 A maintenance window 140 is also provided on the side of the box body 1 corresponding to the spray device 2 to facilitate maintenance of the internal components of the box body 1.

[0050] In one embodiment, see Figure 1 The NMP waste gas treatment device 100 further includes a tail exhaust fan 15, which is arranged on a side of the activated carbon filter box 14 away from the box body 1, and is used to discharge the treated NMP waste gas into the air.

[0051] In one embodiment, see Figure 1 The NMP waste gas treatment device 100 further includes a pure water pipeline 16 for replenishing pure water into the liquid storage tank 3 at the tail end of the pure water pipeline 16 .

[0052] According to another aspect of this application, please also refer to Figure 2 An embodiment of the present application further provides a coating and drying system, which includes a coater 200, an air-to-air heat exchanger 300 and the NMP waste gas treatment device 100 as described above, and the coater 200, the air-to-air heat exchanger 300 and the NMP waste gas treatment device 100 are connected together in sequence.

[0053] In an embodiment of the present application, the coating and drying system includes the NMP waste gas treatment device 100 as described above, so that the coating and drying system can realize the recycling of water resources, and low-concentration waste liquid can also be transported to high-concentration waste liquid for reuse, thereby improving resource utilization.

[0054] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. An NMP waste gas treatment device, characterized in that, include: The box body is formed with a gas channel along a preset horizontal direction, and the two ends of the gas channel along the preset horizontal direction are an air inlet and an air outlet respectively, and the gas channel is used to allow NMP waste gas to pass through; A plurality of spray devices are arranged in sequence along the preset horizontal direction in the gas channel at intervals, the spray devices are arranged at the top of the gas channel, and the liquid sprayed by the spray devices absorbs NMP substances in the NMP waste gas and converts it into NMP waste liquid; A plurality of liquid storage tanks are provided at the bottom of the plurality of spraying devices in a one-to-one correspondence, the liquid storage tanks are used to collect the NMP waste liquid, and the concentration of the NMP waste liquid in the plurality of liquid storage tanks decreases sequentially along the preset horizontal direction; a plurality of first pump bodies, the number of which is the same as the number of the plurality of spraying devices, the first pump bodies being disposed between the corresponding spraying devices and the liquid storage tank, and the first pump bodies being used to transport the NMP waste liquid in the liquid storage tank back to the spraying devices; as well as The second pump body is arranged between any two adjacent liquid storage tanks, and the second pump body is used to transport the NMP waste liquid in the low-concentration liquid storage tank to the adjacent high-concentration liquid storage tank.

2. The NMP waste gas treatment device according to claim 1, characterized in that The NMP waste gas treatment device also includes: A plurality of NMP concentration detection devices are disposed in the plurality of liquid storage tanks in a one-to-one correspondence; and The controller is communicatively connected to the NMP concentration detection device and the second pump body respectively.

3. The NMP waste gas treatment device according to claim 2, characterized in that The NMP waste gas treatment device also includes: Waste tanks; and The third pump body is arranged between the waste liquid tank and the liquid storage tank at the head end along the preset horizontal direction, and the third pump body is communicatively connected to the controller.

4. The NMP waste gas treatment device according to claim 1, characterized in that The NMP waste gas treatment device further includes a primary filter, which is arranged at the air inlet.

5. The NMP waste gas treatment device according to claim 1, characterized in that The NMP waste gas treatment device further includes a wire mesh demister, which is arranged at the gas outlet.

6. The NMP waste gas treatment device according to claim 1, characterized in that The NMP waste gas treatment device further includes two refrigerated surface coolers, which are respectively arranged at the air inlet and the air outlet.

7. The NMP waste gas treatment device according to claim 1, characterized in that The NMP waste gas treatment device further includes a plurality of packing devices for adsorbing the NMP substance. The number of the plurality of packing devices is consistent with the number of the plurality of spray devices. The packing devices are arranged between the corresponding spray devices and the liquid storage tank.

8. The NMP waste gas treatment device according to claim 7, characterized in that A baffle is provided on one side of the filler device close to the air inlet.

9. The NMP waste gas treatment device according to claim 1, characterized in that The NMP waste gas treatment device further includes an activated carbon filter box, which is connected to the gas outlet.

10. A coating and drying system, characterized in that: The invention comprises a coating machine, an air-to-air heat exchanger and the NMP waste gas treatment device according to any one of claims 1 to 9, wherein the coating machine, the air-to-air heat exchanger and the NMP waste gas treatment device are connected together in sequence.

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