A waste gas treatment device

Abstract

This application discloses a waste gas treatment device, including a filter. The filter includes a housing, a filter membrane, and a spray structure. The housing has a chamber, and the filter membrane is disposed within the chamber to divide the chamber into a first sub-chamber and a second sub-chamber. The filter membrane is used to filter organic components in the waste gas entering the first sub-chamber, and the second sub-chamber is used to collect the filtered waste gas. The spray structure extends at least partially into the first sub-chamber and is used to spray a desorbent onto the filter membrane to remove organic components from the filter membrane. Compared to a rotary adsorption device, the filter in the waste gas treatment device provided in this application does not require a continuously rotating rotor and does not require a large amount of steam for desorption, thus saving a significant amount of steam and the energy required for rotor rotation, thereby reducing energy consumption.

Description

Technical Field

[0001] This application belongs to the field of waste gas treatment technology, and specifically relates to a waste gas treatment device. Background Technology

[0002] The manufacturing process of lithium batteries generates waste gas containing NMP (dimethylpyrrolidone), which needs to be treated before being discharged.

[0003] In related technologies, a rotary adsorption device is usually used to adsorb and treat the waste gas, and the waste gas is discharged after the NMP concentration in the waste gas meets the standard.

[0004] However, the rotor in a rotary adsorption device rotates continuously, and the adsorption process requires the use of chilled water for cooling, while the desorption process requires the use of a large amount of steam for desorption, which results in high energy consumption for rotary adsorption devices. Utility Model Content

[0005] This application aims to provide a waste gas treatment device that can solve the problem of high energy consumption.

[0006] To solve the above-mentioned technical problems, this application is implemented as follows:

[0007] In a first aspect, embodiments of this application provide an exhaust gas treatment device, including a filter, the filter comprising a housing, a filter membrane, and a spray structure;

[0008] The housing has a chamber, and the filter membrane is disposed in the chamber to divide the chamber into a first sub-chamber and a second sub-chamber. The filter membrane is used to filter organic components in the exhaust gas introduced into the first sub-chamber, and the second sub-chamber is used to collect the filtered exhaust gas.

[0009] The spray structure extends at least partially into the first sub-cavity, and the spray structure is used to spray a desorbent onto the filter membrane to remove the organic components on the filter membrane.

[0010] Optionally, the filter further includes a purging structure that extends at least partially into the second sub-cavity, the purging structure being used to blow gas onto the filter membrane to dry the filter membrane.

[0011] Optionally, the spray structure includes a main spray pipe and a plurality of nozzle assemblies, each nozzle assembly including a sub-pipe and a nozzle communicating with the sub-pipe, and the plurality of nozzle assemblies are arranged at least at intervals along the height direction of the filter;

[0012] The end of the sub-tube away from the nozzle is connected to the main spray pipe, the end of the main spray pipe away from the sub-tube is used to introduce the desorbent, and the nozzle is used to spray the desorbent onto the filter membrane;

[0013] And / or, the purging structure includes a blowing main pipe and a plurality of blowing elements, the plurality of blowing elements being arranged at least at intervals along the height direction of the filter;

[0014] One end of the air blowing component is connected to the air blowing main pipe, and the other end has an air blowing port. The air blowing main pipe is used to introduce the gas into one end of the air blowing component so as to blow the gas to the filter membrane through the air blowing port.

[0015] Optionally, the number of filters is two, and the two filters are a first filter and a second filter, respectively;

[0016] The waste gas treatment device further includes a gas inlet pipe, a first inlet pipe, and a second inlet pipe, wherein the gas inlet pipe is used to introduce the waste gas.

[0017] One end of the first air intake pipe is connected to the gas inlet pipe, and the other end is connected to the first sub-chamber of the first filter. A first switch is provided in the first air intake pipe.

[0018] One end of the second air intake pipe is connected to the gas inlet pipe, and the other end is connected to the first sub-chamber of the second filter. A second switch is provided in the second air intake pipe.

[0019] Optionally, the exhaust gas treatment device further includes an exhaust pipe, which is connected to the second sub-chamber of the first filter and the second sub-chamber of the second filter;

[0020] The exhaust gas treatment device further includes a first connecting pipe, one end of which is connected to the purging structure of the first filter, and the other end is connected to the exhaust pipe. A third shut-off component is provided in the first connecting pipe.

[0021] And / or, the exhaust gas treatment device further includes a second connecting pipe, one end of which is connected to the purging structure of the second filter, and the other end of which is connected to the exhaust pipe. A fourth shut-off element is provided in the second connecting pipe, and the gas is the filtered exhaust gas.

[0022] Optionally, the exhaust gas treatment device further includes a connecting pipe and a booster fan;

[0023] The booster fan is located in the connecting pipe, one end of which is connected to the exhaust pipe, and the first and second connecting pipes are both connected to the other end of the connecting pipe.

[0024] Optionally, the waste gas treatment device further includes a condenser, an inlet pipe, and an outlet pipe, wherein the condenser has a gas inlet and a gas outlet;

[0025] The inlet pipe is connected to the first sub-chamber of the first filter and the first sub-chamber of the second filter, and is also connected to the gas inlet. The outlet pipe is connected to the gas outlet, and is also connected to the first sub-chamber of the first filter and the first sub-chamber of the second filter.

[0026] Optionally, the waste gas treatment device further includes a drain pipe, the first filter and the second filter both have drain ports, the condenser has an outlet, and the drain pipe is connected to the drain ports of the first filter, the second filter, and the outlet.

[0027] Optionally, the waste gas treatment device further includes a reagent inlet pipe, a booster pump, a first feed pipe, and a second feed pipe. The reagent inlet pipe is used to introduce the desorbent, and the booster pump is located in the reagent inlet pipe.

[0028] One end of the first feed pipe is connected to the reagent inlet pipe, and the other end is connected to the spray structure of the first filter. A fifth switch is provided in the first feed pipe.

[0029] One end of the second feed pipe is connected to the reagent inlet pipe, and the other end is connected to the spray structure of the first filter. A sixth shut-off element is provided in the second feed pipe.

[0030] Optionally, the filter membrane is a hydrophobic filter membrane.

[0031] In the embodiments of this application, the filter membrane in the filter can filter organic components in the exhaust gas entering the first sub-cavity. After a certain amount of organic components accumulate on the surface of the filter membrane facing the first sub-cavity, the desorbent sprayed by the spray structure can remove the accumulated organic components on the surface of the filter membrane, thereby restoring the normal filtration performance of the filter membrane. Compared with a rotary adsorption device, the filter in the exhaust gas treatment device provided in this application does not require a continuously rotating wheel and does not require a large amount of steam for desorption, thus saving a large amount of steam and the energy required for the wheel rotation, thereby reducing energy consumption. In addition, the filter has no moving parts, making it easier to ensure sealing compared to a rotary adsorption device.

[0032] The above description is merely an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below, wherein:

[0034] Figure 1 This is a schematic diagram of the structure of the filter in the waste gas treatment device provided in the embodiments of this application;

[0035] Figure 2 This is a schematic diagram of the overall structure of the waste gas treatment device provided in the embodiments of this application;

[0036] Figure 3 This is a schematic diagram showing the flow direction of waste gas, pure water, and waste liquid during the filtration of the first filter and the desorption of the second filter in the waste gas treatment device provided in this application embodiment;

[0037] Figure 4 This is a schematic diagram showing the flow direction of waste gas, pure water, and waste liquid during the second filter filtration and the first filter desorption processes in the waste gas treatment device provided in this application embodiment.

[0038] Figure label:

[0039] 10-Filter, 11-Housing, 12-Filter membrane, 13-Spray structure, 14-Purge structure, 15-First sub-chamber, 16-Second sub-chamber; A-First filter, B-Second filter;

[0040] 20-Gas piping assembly, 21-Gas inlet pipe, 22-First inlet pipe, 23-Second inlet pipe, 24-First exhaust pipe, 25-Second exhaust pipe, 26-Gas outlet pipe, 27-First connecting pipe, 28-Second connecting pipe, 29-Connecting pipe;

[0041] 30-Condensate piping assembly, 31-First piping, 32-Second piping, 33-Third piping, 34-Fourth piping, 35-Fifth piping, 36-Sixth piping, 37-Chiller water supply piping, 38-Chiller water return piping;

[0042] 40-Liquid piping assembly, 41-Reagent inlet pipe, 42-First feed pipe, 43-Second feed pipe, 44-First drain pipe, 45-Second drain pipe, 46-Third drain pipe, 47-Liquid outlet pipe;

[0043] 50 - Condenser, 60 - Booster pump, 70 - Booster fan;

[0044] F1 - First switch, F2 - Second switch, F3 - Third switch, F4 - Fourth switch, F5 - Fifth switch, F6 - Sixth switch, F7 - Seventh switch, F8 - Eighth switch, F9 - Ninth switch, F10 - Tenth switch, F11 - Eleventh switch, F12 - Twelfth switch, F13 - Thirteenth switch, F14 - Fourteenth switch, F15 - Fifteenth switch, F16 - Sixteenth switch. Detailed Implementation

[0045] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0046] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0047] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0049] The waste gas treatment device provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0050] like Figure 1As shown, a waste gas treatment apparatus according to some embodiments of this application includes a filter 10. The filter 10 includes a housing 11, a filter membrane 12, and a spray structure 13. The housing 11 has a chamber, and the filter membrane 12 is disposed in the chamber to divide the chamber into a first sub-chamber 15 and a second sub-chamber 16. The filter membrane 12 is used to filter organic components in the waste gas entering the first sub-chamber 15, and the second sub-chamber 16 is used to collect the filtered waste gas. The spray structure 13 extends at least partially into the first sub-chamber 15 and is used to spray a desorbent onto the filter membrane 12 to remove organic components from the filter membrane 12. For example, an organic reagent can be used to dissolve the organic components on the surface of the filter membrane 12. The desorbent is a reagent that can remove organic components from the filter membrane 12, and can be a gaseous reagent or a liquid reagent. For example, taking water as the desorbent, liquid water can be directly sprayed onto the filter membrane 12 to remove the organic components on the filter membrane 12, or water vapor can be sprayed onto the filter membrane 12 to remove the organic components on the filter membrane 12.

[0051] In the embodiments of this application, the filter membrane 12 in the filter 10 can filter the organic components in the exhaust gas entering the first sub-cavity 15. After the organic components accumulated on the surface of the filter membrane 12 facing the first sub-cavity 15 reach a certain amount, the desorbent sprayed by the spray structure 13 can remove the organic components accumulated on the surface of the filter membrane 12, thereby restoring the normal filtration performance of the filter membrane 12. Compared with the rotary adsorption device, the filter 10 in the exhaust gas treatment device provided in this application does not require a continuously rotating wheel and does not require a large amount of steam for desorption, thus saving a large amount of steam and the energy required for the wheel rotation, thereby reducing energy consumption. In addition, the filter 10 has no moving parts, making it easier to ensure sealing compared to the rotary adsorption device.

[0052] The exhaust gas can be the exhaust gas emitted by the coating machine used for coating electrode paste. The exhaust gas contains organic components, which can be NMP (dimethylpyrrolidone). NMP is miscible with pure water in any proportion and has a low dew point.

[0053] The housing 11 has an opening that is not exposed to the outside. This opening is intended for pipes to pass through or connect to pipes, rather than being directly exposed, to ensure the housing 11's airtightness and prevent NMP leakage, thus improving safety. NMP is corrosive, and the housing 11 can be made of a corrosion-resistant material, such as stainless steel.

[0054] The chamber of the housing 11 can be a cuboid or a cube. Specifically, the filter membrane 12 divides the chamber into a first sub-chamber 15 and a second sub-chamber 16 along a first direction. The first direction is perpendicular to the height direction of the filter 10, which can be referenced... Figure 1 The direction indicated by the arrow C in the middle can be referenced in the first direction. Figure 1 The direction indicated by the arrow D in the middle. The volumes of the first sub-cavity 15 and the second sub-cavity 16 may be equal or unequal.

[0055] The filter membrane 12 is used to filter NMP from exhaust gas. The filter membrane 12 has a number of micropores, the diameter of which can be less than or equal to 0.5 μm. Air can pass through the micropores on the filter membrane 12, while NMP is trapped on the filter membrane 12, thereby achieving the filtration of NMP from the exhaust gas.

[0056] As one example, the spray structure 13 is entirely located within the first sub-cavity 15. As another example, the spray structure 13 is partially located within the first sub-cavity 15 and partially extends outside the first sub-cavity 15. The desorbent can be a solution capable of dissolving NMP, and may include at least one of water, pure water, and an alkaline solution. Since NMP is miscible with pure water in any proportion, pure water is preferably used as the desorbent to maximize the dissolution of NMP. The filter membrane 12 is impermeable to the desorbent.

[0057] After the filter membrane 12 filters the exhaust gas, NMP will remain on the surface of the filter membrane 12 facing the first sub-cavity 15. When the amount of NMP accumulated on the surface of the filter membrane 12 facing the first sub-cavity 15 reaches a certain level, a desorbent needs to be sprayed onto the filter membrane 12 through the spray structure 13 to dissolve the NMP accumulated on the surface of the filter membrane 12, thereby restoring the normal filtration performance of the filter membrane 12.

[0058] In some embodiments, the filter 10 further includes a purge structure 14 that extends at least partially into the second sub-cavity 16, the purge structure 14 being used to blow gas onto the filter membrane 12 to dry the filter membrane 12.

[0059] As one example, the purging structure 14 is entirely located within the second sub-cavity 16. As another example, the purging structure 14 is partially located within the second sub-cavity 16 and partially extends outside the second sub-cavity 16. The gas can be dried air introduced from the outside or exhaust gas filtered by another filter 10.

[0060] After the spray structure 13 sprays the desorbent onto the filter membrane 12, the desorbent will remain on the surface of the filter membrane 12 facing the first sub-cavity 15. In order to avoid the desorbent residue affecting the normal filtration performance of the filter membrane 12, gas needs to be blown onto the filter membrane 12 through the purging structure 14. The gas passes through the filter membrane 12 and enters the first sub-cavity 15, thereby drying the surface of the filter membrane 12 facing the first sub-cavity 15 and restoring the normal filtration performance of the filter membrane 12, so that the filter membrane 12 can repeatedly filter the organic components in the exhaust gas.

[0061] In some embodiments, the spray structure 13 includes a main spray pipe and a plurality of nozzle assemblies. Each nozzle assembly includes a sub-pipe and nozzles communicating with the sub-pipes. The plurality of nozzle assemblies are arranged at intervals along the height direction of the filter 10. The end of the sub-pipe away from the nozzles is connected to the main spray pipe, and the end of the main spray pipe away from the sub-pipes is used to introduce a desorbent. The nozzles are used to spray the desorbent onto the filter membrane 12. In this embodiment, the arrangement of multiple nozzle assemblies improves the uniformity of the desorbent spray, thereby ensuring sufficient dissolution of organic components on the surface of the filter membrane 12.

[0062] The main spray pipe extends along the height direction of the filter 10, and the sub-pipes extend along a first direction. As an example, the nozzle assembly includes multiple sub-pipes and multiple nozzles respectively connected to the multiple sub-pipes. The multiple sub-pipes are connected to the main spray pipe via an intermediate pipe. The multiple sub-pipes and multiple nozzles in the nozzle assembly are arranged at intervals along a second direction, with the intermediate pipe extending along the second direction. The second direction is perpendicular to the first direction and also perpendicular to the height direction of the filter 10. As another example, the nozzle assembly includes only one sub-pipe and one nozzle connected to that sub-pipe; the nozzle is a wide-angle nozzle.

[0063] In some embodiments, the purging structure 14 includes a main blowing pipe and a plurality of blowing elements, which are arranged at intervals along the height direction of the filter 10. One end of each blowing element is connected to the main blowing pipe, and the other end has a blowing port. The main blowing pipe is used to introduce gas into one end of the blowing element to blow gas onto the filter membrane 12 through the blowing port. In this embodiment, the arrangement of multiple blowing elements can improve the uniformity of gas blowing, thereby ensuring the drying effect on the filter membrane 12.

[0064] The main air blowing pipe can extend along the height direction of the filter 10. As an example, the air blowing component specifically includes multiple air blowing ports, which are spaced apart along a second direction. The air blowing component may include a main pipe section and multiple branch pipe sections connected to the main pipe section. The main pipe section is connected to the main air blowing pipe, and each branch pipe section has an air blowing port at its end furthest from the main pipe section. The main pipe section extends along the second direction, and the branch pipe sections extend along a first direction. The air blowing component may also consist only of a tubular structure extending along the second direction, on which multiple air blowing ports are provided.

[0065] As another example, the blowing element has only one blowing port, the blowing element is a tubular structure, and the blowing element can extend along a first direction.

[0066] In some embodiments, such as Figure 2As shown, there are two filters 10, namely the first filter A and the second filter B. The exhaust gas treatment device also includes a gas inlet pipe 21, a first air inlet pipe 22 and a second air inlet pipe 23. The gas inlet pipe 21 is used to introduce exhaust gas. One end of the first air inlet pipe 22 is connected to the gas inlet pipe 21 and the other end is connected to the first sub-cavity 15 of the first filter A. A first on / off element F1 is provided in the first air inlet pipe 22. One end of the second air inlet pipe 23 is connected to the gas inlet pipe 21 and the other end is connected to the first sub-cavity 15 of the second filter B. A second on / off element F2 is provided in the second air inlet pipe 23.

[0067] The first shut-off element F1 and the second shut-off element F2 can be on / off valves. When the first shut-off element F1 is open and the second shut-off element F2 is closed, the exhaust gas enters the first sub-chamber 15 of the first filter A through the gas inlet pipe 21 and the first inlet pipe 22. At this time, the first filter A filters the exhaust gas. When the first shut-off element F1 is closed and the second shut-off element F2 is open, the exhaust gas enters the first sub-chamber 15 of the second filter B through the gas inlet pipe 21 and the second inlet pipe 23. At this time, the second filter B filters the exhaust gas.

[0068] Initially, exhaust gas can be filtered through the first filter A. After the NMP accumulated on the surface of the first filter A reaches a certain amount, the system switches to the second filter B to filter the exhaust gas. During the filtration process of the second filter B, a desorbent is sprayed onto the filter membrane 12 through the spray structure 13 of the first filter A. Then, gas is blown onto the filter membrane 12 through the purging structure 14. After the filter membrane 12 in the first filter A is cleaned and dried, and after the NMP accumulated on the surface of the second filter B reaches a certain amount, the system switches back to the first filter A to filter the exhaust gas. During the filtration process of the first filter A, a desorbent is sprayed onto the filter membrane 12 through the spray structure 13 of the second filter B. Then, gas is blown onto the filter membrane 12 through the purging structure 14.

[0069] In this embodiment, the exhaust gas is filtered alternately by the first filter A and the second filter B, and the filter 10 is cleaned and dried during the non-exhaust gas filtration process. This enables continuous treatment of the exhaust gas, ensuring that the exhaust gas treatment process is uninterrupted, thereby avoiding the impact of maintenance of the exhaust gas treatment device on the normal operation of the production line.

[0070] In some embodiments, such as Figure 2As shown, the exhaust gas treatment device also includes an exhaust pipe, which is connected to the second sub-cavity 16 of the first filter A and the second sub-cavity 16 of the second filter B; the exhaust gas treatment device also includes a first connecting pipe 27, one end of which is connected to the purging structure 14 of the first filter A and the other end of which is connected to the exhaust pipe, and a third shut-off element F3 is provided in the first connecting pipe 27; the exhaust gas treatment device also includes a second connecting pipe 28, one end of which is connected to the purging structure 14 of the second filter B and the other end of which is connected to the exhaust pipe, and a fourth shut-off element F4 is provided in the second connecting pipe 28, and the gas is the filtered exhaust gas.

[0071] The exhaust pipe includes a first exhaust pipe 24, a second exhaust pipe 25, and a gas discharge pipe 26. One end of the first exhaust pipe 24 is connected to the second sub-cavity 16 of the first filter A, and the other end is connected to the gas discharge pipe 26. A seventh shut-off element F7 is provided in the first exhaust pipe 24. One end of the second exhaust pipe 25 is connected to the second sub-cavity 16 of the second filter B, and the other end is connected to the gas discharge pipe 26. An eighth shut-off element F8 is provided in the second exhaust pipe 25.

[0072] The end of the first connecting pipe 27 away from the first filter A and the end of the second connecting pipe 28 away from the second filter B are both connected to the gas discharge pipe 26. For example, they are connected to the end of the gas discharge pipe 26 used to connect the first exhaust pipe 24 and the second exhaust pipe 25. At this time, the first connecting pipe 27 and the second connecting pipe 28 are also connected to the first exhaust pipe 24 and the second exhaust pipe 25.

[0073] The aforementioned third shut-off element F3, fourth shut-off element F4, seventh shut-off element F7 and eighth shut-off element F8 can be on / off type valves.

[0074] When the first shut-off element F1 and the seventh shut-off element F7 are open, the second shut-off element F2 and the eighth shut-off element F8 are closed, the third shut-off element F3 is closed, and the fourth shut-off element F4 is open, the exhaust gas enters the first sub-cavity 15 of the first filter A through the gas inlet pipe 21 and the first air inlet pipe 22. The first filter A filters the exhaust gas. The filtered qualified exhaust gas is discharged to the atmosphere through the first exhaust pipe 24 and the gas discharge pipe 26. The qualified exhaust gas flowing through the gas discharge pipe 26 or the junction of the gas discharge pipe 26 and the first exhaust pipe 24 flows in reverse into the second connecting pipe 28 through the fan, and is then introduced into the purging structure 14 of the second filter B through the second connecting pipe 28.

[0075] When the first shut-off element F1 and the seventh shut-off element F7 are closed, the second shut-off element F2 and the eighth shut-off element F8 are open, the third shut-off element F3 is open, and the fourth shut-off element F4 is closed, the exhaust gas enters the first sub-cavity 15 of the second filter B through the gas inlet pipe 21 and the second inlet pipe 23. The first filter B filters the exhaust gas. The filtered qualified exhaust gas is discharged to the atmosphere through the second exhaust pipe 25 and the gas discharge pipe 26. The qualified exhaust gas flowing through the gas discharge pipe 26 or the junction of the gas discharge pipe 26 and the first exhaust pipe 24 flows back into the first connecting pipe 27 through the fan, and is then introduced into the purging structure 14 of the first filter A through the first connecting pipe 27.

[0076] In this embodiment, the qualified exhaust gas filtered by one filter 10 can be used to dry the filter membrane of another filter 10, without the need to introduce dried air from the outside, which helps to simplify the structure of the exhaust gas treatment device.

[0077] In some embodiments, such as Figure 2 As shown, the exhaust gas treatment device also includes a connecting pipe 29 and a booster fan 70; the booster fan 70 is located in the connecting pipe 29, one end of the connecting pipe 29 is connected to the exhaust pipe (the exhaust pipe includes a first exhaust pipe 24, a second exhaust pipe 25 and a gas discharge pipe 26), and the first connecting pipe 27 and the second connecting pipe 28 are both connected to the other end of the connecting pipe 29.

[0078] One end of the connecting pipe 29 is specifically connected to the gas discharge pipe 26, meaning that both the first connecting pipe 27 and the second connecting pipe 28 are connected to the gas discharge pipe 26 via the connecting pipe 29. The booster fan 70 is used to pressurize the qualified waste gas flowing within the connecting pipe 29, ensuring that the qualified waste gas entering the purging structure 14 of the first filter A or the second filter B has a certain pressure, thereby guaranteeing the drying effect on the filter membrane 12. Furthermore, since both the first connecting pipe 27 and the second connecting pipe 28 are connected to the gas discharge pipe 26 via the connecting pipe 29, only one booster fan 70 needs to be installed in the connecting pipe 29, which simplifies the structure of the waste gas treatment device.

[0079] The gas inlet pipe 21, the first inlet pipe 22, the second inlet pipe 23, the first exhaust pipe 24, the second exhaust pipe 25, the gas outlet pipe 26, the first connecting pipe 27, the second connecting pipe 28 and the connecting pipe 29 constitute the gas pipeline assembly 20.

[0080] In some embodiments, such as Figure 2As shown, the waste gas treatment device also includes a condenser 50, an inlet pipe and an outlet pipe. The condenser 50 has a gas inlet and a gas outlet. The inlet pipe is connected to the first sub-cavity 15 of the first filter A and the first sub-cavity 15 of the second filter B, and is also connected to the gas inlet. The outlet pipe is connected to the gas outlet and is also connected to the first sub-cavity 15 of the first filter A and the first sub-cavity 15 of the second filter B.

[0081] The condenser 50 is used for condensing the gas. The exhaust gas treatment device also includes a chilled water supply line 37 and a chilled water return line 38, both of which are connected to the condenser 50. The chilled water supply line 37 is used to supply chilled water to the condenser 50, and the chilled water return line 38 is used to supply chilled water to the outlet. The chilled water supply line 37 is equipped with a sixteenth shut-off component F16, and the chilled water return line 38 is equipped with a seventeenth shut-off component F17.

[0082] The inlet pipes include a first pipe 31, a second pipe 32, and a third pipe 33. One end of the first pipe 31 is connected to the gas inlet of the condenser 50, and the other end of the first pipe 31 is connected to the second pipe 32 and the third pipe 33. The end of the second pipe 32 away from the first pipe 31 is connected to the first sub-cavity 15 of the first filter A. The second pipe 32 is provided with an eleventh shut-off element F11. The end of the third pipe 33 away from the first pipe 31 is connected to the first sub-cavity 15 of the second filter B. The third pipe 33 is provided with a thirteenth shut-off element F13.

[0083] The outlet pipes include a fourth pipe 34, a fifth pipe 35, and a sixth pipe 36. One end of the fourth pipe 34 is connected to the gas outlet of the condenser 50, and the other end of the fourth pipe 34 is connected to the fifth pipe 35 and the sixth pipe 36. The end of the fifth pipe 35 away from the fourth pipe 34 is connected to the first sub-cavity 15 of the first filter A. The fiveth pipe 35 is provided with a fourteenth shut-off element F14. The end of the sixth pipe 36 away from the fourth pipe 34 is connected to the first sub-cavity 15 of the second filter B. The sixth pipe 36 is provided with a twelfth shut-off element F12.

[0084] The aforementioned eleventh shut-off element F11, twelfth shut-off element F12, thirteenth shut-off element F13, fourteenth shut-off element F14, sixteenth shut-off element F16, and seventeenth shut-off element F17 can be on / off type valves. The aforementioned first pipeline 31, second pipeline 32, third pipeline 33, fourth pipeline 34, fifth pipeline 35, sixth pipeline 36, chilled water supply pipeline 37, and chilled water return pipeline 38 constitute the condensate pipeline assembly 30.

[0085] The filter 10, which is undergoing drying, has a purging structure 14 that blows qualified waste gas filtered by another filter 10. After the qualified waste gas dries the filter membrane 12, it will contain water vapor and flow out from the first sub-cavity 15. When the sixteenth and seventeenth shut-off components F16 and F17 are opened, the condenser 50 performs a condensation function. The waste gas containing water vapor and NMP flowing out of the first sub-cavity 15 of the first filter A or the second filter B passes through the second pipe 32 or the third pipe 33, and then through the first pipe 31 and enters the condenser 50 through the gas inlet. In the condenser 50, the water vapor condenses into liquid water. During the condensation process, the water vapor can absorb some NMP, thereby forming waste liquid containing NMP. The gas outlet of the condenser 50 discharges low-humidity waste gas containing NMP. The low-humidity waste gas containing NMP is then passed into the first sub-cavity 15 of the second filter B or the first filter A for further filtration.

[0086] In this embodiment, the exhaust gas containing water vapor and NMP flowing out of the first sub-chamber 15 of the filter 10 undergoing drying is introduced into the condenser 50. After condensation treatment by the condenser 50, the gas outlet of the condenser 50 discharges low-humidity exhaust gas containing NMP. The low-humidity exhaust gas containing NMP is then passed into the filter 10 that is filtering exhaust gas for further filtration. There is no need to set up other filtration structures to filter the low-humidity exhaust gas containing NMP after condensation by the condenser 50, which helps to simplify the structure of the exhaust gas treatment device.

[0087] In some embodiments, such as Figure 2 As shown, the waste gas treatment device also includes a drain pipe, the first filter A and the second filter B both have drain ports, the condenser 50 has an outlet, and the drain pipe is connected to the drain port of the first filter A, the drain port of the second filter B, and the outlet.

[0088] The drainage system includes a liquid outlet pipe 47, a first drainage pipe 44, a second drainage pipe 45, and a third drainage pipe 46. One end of the first drainage pipe 44 is connected to the drainage port of the first filter A, and the other end is connected to the liquid outlet pipe 47. One end of the second drainage pipe 45 is connected to the drainage port of the second filter B, and the other end is connected to the liquid outlet pipe 47. One end of the third drainage pipe 46 is connected to the outlet of the condenser 50, and the other end is connected to the liquid outlet pipe 47. The first drainage pipe 44 is equipped with a ninth shut-off element F9, the second drainage pipe 45 is equipped with a tenth shut-off element F10, and the third drainage pipe 46 is equipped with a fifteenth shut-off element F15. The ninth shut-off element F9, the tenth shut-off element F10, and the fifteenth shut-off element F15 can be on / off valves.

[0089] In this embodiment of the application, the desorbent (e.g., water) containing NMP dissolved in the first sub-cavity 15 of the first filter A and the second filter B, i.e., the waste liquid containing NMP, can be drawn out through the drain pipe. It can also draw out the waste liquid containing NMP discharged from the outlet of the condenser 50, so as to facilitate the centralized recycling and treatment of the waste liquid containing NMP in the future.

[0090] In some embodiments, such as Figure 2 As shown, the waste gas treatment device also includes a reagent inlet pipe 41, a booster pump 60, a first feed pipe 42, and a second feed pipe 43. The reagent inlet pipe 41 is used to introduce the desorbent, and the booster pump 60 is located in the reagent inlet pipe 41. One end of the first feed pipe 42 is connected to the reagent inlet pipe 41, and the other end is connected to the spray structure 13 of the first filter A. A fifth shut-off element F5 is provided in the first feed pipe 42. One end of the second feed pipe 43 is connected to the reagent inlet pipe 41, and the other end is connected to the spray structure 13 of the second filter B. A sixth shut-off element F6 is provided in the second feed pipe 43.

[0091] The fifth shut-off component F5 and the sixth shut-off component F6 can be switch-type valves. The booster pump 60 is used to pressurize the desorbent flowing in the reagent inlet pipe 41 so that the desorbent entering the spray structure 13 of the first filter A or the second filter B has a certain pressure to ensure that the NMP on the surface of the filter membrane 12 is fully dissolved, thereby ensuring the cleaning effect of the filter membrane 12.

[0092] The above-mentioned reagent inlet tube 41, first feed tube 42, second feed tube 43, first drain tube 44, second drain tube 45, third drain tube 46 and liquid outlet tube 47 constitute the liquid pipeline assembly 40.

[0093] In some embodiments, the filter membrane 12 is a hydrophobic filter membrane.

[0094] The hydrophobic filter membrane possesses both hydrophobic and oleophobic properties. In this embodiment, the material of the filter membrane 12 includes, but is not limited to, PTFE (polytetrafluoroethylene), ePTFE (expanded polytetrafluoroethylene), and hydrophobic PVDF (polyvinylidene fluoride). In this embodiment, after the spray structure 13 sprays the desorbent onto the filter membrane 12, the desorbent does not easily penetrate into the interior of the filter membrane 12, ensuring the subsequent normal drying of the filter membrane 12 and avoiding any impact on the drying effect caused by the desorbent penetrating into the interior of the filter membrane 12.

[0095] like Figure 3As shown, the treatment process of filtration by the first filter A and desorption by the second filter B can be as follows: High-concentration NMP waste gas enters the first filter A and is filtered through the filter membrane 12 of the first filter A. After filtration, the qualified waste gas is discharged into the atmosphere. The booster pump 60 pressurizes pure water and sends it to the spray structure 13 of the second filter B. The pure water spray dissolves the NMP on the surface of the filter membrane 12 of the second filter B and carries it away. The waste liquid containing NMP is discharged from the second filter B. The booster fan 70 draws out the waste gas filtered from the first filter A. The qualified exhaust gas is pressurized and sent to the purging structure 14 of the second filter B. The qualified exhaust gas back-purges the filter membrane 12 of the second filter B to dry the filter membrane 12. The exhaust gas containing water vapor and NMP flowing out of the first sub-chamber 15 of the second filter B is introduced into the condenser 50. After condensation treatment by the condenser 50, the waste liquid containing NMP is discharged from the condenser 50. The gas outlet of the condenser 50 discharges low-humidity exhaust gas containing NMP. The low-humidity exhaust gas containing NMP is passed into the first filter A for further filtration.

[0096] like Figure 4 As shown, the treatment process of filtration by the second filter B and desorption by the first filter A can be as follows: High-concentration NMP waste gas enters the second filter B and is filtered through the filter membrane 12 of the second filter B. After filtration, the qualified waste gas is discharged into the atmosphere. The booster pump 60 pressurizes pure water and sends it to the spray structure 13 of the first filter A. The pure water spray dissolves the NMP on the surface of the filter membrane 12 of the first filter A and carries it away. The waste liquid containing NMP is discharged from the first filter A. The booster fan 70 draws a portion of the waste gas from the second filter B. The filtered qualified exhaust gas is pressurized and sent to the purging structure 14 of the first filter A. The qualified exhaust gas back-purges the filter membrane 12 of the first filter A to dry the filter membrane 12. The exhaust gas containing water vapor and NMP flowing out of the first sub-chamber 15 of the first filter A is introduced into the condenser 50. After condensation treatment by the condenser 50, the waste liquid containing NMP is discharged from the condenser 50. The gas outlet of the condenser 50 discharges low-humidity exhaust gas containing NMP. The low-humidity exhaust gas containing NMP is passed into the second filter B for further filtration.

[0097] It should be noted that the desorption treatment of the first filter A and the second filter B refers to the cleaning and drying treatment of the first filter A and the second filter B.

[0098] The working principle of the above-mentioned waste gas treatment device can be summarized as follows:

[0099] Initially, the first shut-off component F1 and the seventh shut-off component F7 are open, the second shut-off component F2 and the eighth shut-off component F8 are closed, the third shut-off component F3, the fourth shut-off component F4, the fifth shut-off component F5, and the sixth shut-off component F6 are closed, the ninth shut-off component F9, the tenth shut-off component F10, and the fifteenth shut-off component F15 are open, and the eleventh shut-off component F11, the twelfth shut-off component F12, the thirteenth shut-off component F13, the fourteenth shut-off component F14, the sixteenth shut-off component F16, and the seventeenth shut-off component F17 are closed. The booster pump 60 and the booster fan 70 are not running.

[0100] S1, high-concentration NMP exhaust gas enters the first filter A through the gas inlet pipe 21 and the first inlet pipe 22, and is filtered through the filter membrane 12 of the first filter A. After filtration, the qualified exhaust gas is discharged to the atmosphere through the first exhaust pipe 24 and the gas discharge pipe 26.

[0101] S2, after the NMP accumulated on the surface of the filter membrane 12 of the first filter A reaches a certain amount, the second shut-off element F2 and the eighth shut-off element F8 are opened, and the first shut-off element F1 and the seventh shut-off element F7 are closed. The high-concentration NMP exhaust gas enters the second filter B through the gas inlet pipe 21 and the second inlet pipe 23, and is filtered through the filter membrane 12 of the second filter B. After filtration, the qualified exhaust gas is discharged to the atmosphere through the second exhaust pipe 25 and the gas discharge pipe 26.

[0102] S3, booster pump 60 is running, fifth switch F5 is opened, booster pump 60 pressurizes pure water and sends it to spray structure 13 of first filter A through first feed pipe 42. Spray structure 13 sprays pure water onto the surface of filter membrane 12 of first filter A, dissolving and carrying away NMP on the surface of filter membrane 12 to clean filter membrane 12 of first filter A. Waste liquid containing NMP is discharged through drain port of first filter A, first drain pipe 44 and liquid outlet pipe 47.

[0103] S4, after the filter membrane 12 of the first filter A is cleaned, the booster pump 60 stops running, the fifth shut-off component F5 is closed, the sixteenth shut-off component F16 and the seventeenth shut-off component F17 are opened, the eleventh shut-off component F11 and the twelfth shut-off component F12 are opened, the third shut-off component F3 is opened, the booster fan 70 runs, the booster fan 70 draws out part of the qualified waste gas filtered by the second filter B and pressurizes it, the qualified waste gas is sent into the purging structure 14 of the first filter A through the first connecting pipe 27, the qualified waste gas back-blowing the filter membrane 12 of the first filter A to dry the filter membrane 12;

[0104] S5, the exhaust gas containing water vapor and NMP flowing out of the first sub-chamber 15 of the first filter A is introduced into the condenser 50 through the second pipe 32 and the first pipe 31. After being condensed by the condenser 50, the waste liquid containing NMP is discharged through the liquid outlet of the condenser 50, the third drain pipe 46 and the liquid outlet pipe 47.

[0105] S6, the gas outlet of condenser 50 discharges low-humidity exhaust gas containing NMP. The low-humidity exhaust gas containing NMP is introduced into the second filter B through the fourth pipe 34 and the sixth pipe 36 for further filtration. After the filter membrane 12 of the first filter A is dried, the sixteenth and seventeenth shut-off components F16 and F17 are closed, the eleventh and twelfth shut-off components F11 and F12 are closed, the third shut-off component F3 is closed, and the booster fan 70 stops running.

[0106] S7, after the NMP accumulated on the surface of the filter membrane 12 of the second filter B reaches a certain amount, the first shut-off element F1 and the seventh shut-off element F7 are opened, and the second shut-off element F2 and the eighth shut-off element F8 are closed. The high-concentration NMP exhaust gas enters the first filter A through the gas inlet pipe 21 and the first inlet pipe 22, and is filtered through the filter membrane 12 of the first filter A. After filtration, the qualified exhaust gas is discharged to the atmosphere through the first exhaust pipe 24 and the gas discharge pipe 26.

[0107] S8, booster pump 60 runs, sixth shut-off component F6 opens, booster pump 60 pressurizes pure water and sends it to spray structure 13 of second filter B through second feed pipe 43. Spray structure 13 sprays pure water onto the surface of filter membrane 12 of second filter B, dissolving and carrying away NMP on the surface of filter membrane 12 to clean filter membrane 12 of second filter B. Waste liquid containing NMP is discharged through drain port of second filter B, second drain pipe 45 and liquid outlet pipe 47.

[0108] S9, after the filter membrane 12 of the second filter B is cleaned, the booster pump 60 stops running, the sixth shut-off component F6 is closed, the sixteenth shut-off component F16 and the seventeenth shut-off component F17 are opened, the thirteenth shut-off component F13 and the fourteenth shut-off component F14 are opened, the fourth shut-off component F4 is opened, the booster fan 70 runs, the booster fan 70 draws out part of the qualified waste gas filtered by the first filter A and pressurizes it, the qualified waste gas is sent into the purging structure 14 of the second filter B through the second connecting pipe 28, the qualified waste gas back-blowing the filter membrane 12 of the second filter B to dry the filter membrane 12;

[0109] S10, the exhaust gas containing water vapor and NMP flowing out of the first sub-chamber 15 of the second filter B is introduced into the condenser 50 through the third pipe 33 and the first pipe 31. After being condensed by the condenser 50, the waste liquid containing NMP is discharged through the liquid outlet of the condenser 50, the third drain pipe 46 and the liquid outlet pipe 47.

[0110] S11, the gas outlet of condenser 50 discharges low-humidity exhaust gas containing NMP. The low-humidity exhaust gas containing NMP is introduced into the first filter A through the fourth pipe 34 and the fifth pipe 35 for further filtration. After the filter membrane 12 of the second filter B is dried, the sixteenth and seventeenth shut-off components F16 and F17 are closed, the thirteenth and fourteenth shut-off components F13 and F14 are closed, the fourth shut-off component F4 is closed, and the booster fan 70 stops running.

[0111] By repeating steps S2-S11 above, high-concentration NMP waste gas can be continuously processed.

[0112] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0113] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A waste gas treatment device, characterized in that, Includes a filter (10), which includes a housing (11), a filter membrane (12), and a spray structure (13); The housing (11) has a chamber, and the filter membrane (12) is disposed in the chamber to divide the chamber into a first sub-chamber (15) and a second sub-chamber (16). The filter membrane (12) is used to filter the organic components in the exhaust gas introduced into the first sub-chamber (15), and the second sub-chamber (16) is used to collect the filtered exhaust gas. The spray structure (13) extends at least partially into the first sub-cavity (15), and the spray structure (13) is used to spray a desorbent onto the filter membrane (12) to remove the organic components on the filter membrane (12).

2. The waste gas treatment device according to claim 1, characterized in that, The filter (10) further includes a purging structure (14) that extends at least partially into the second sub-cavity (16) and is used to blow gas onto the filter membrane (12) to dry the filter membrane (12).

3. The waste gas treatment device according to claim 2, characterized in that, The spray structure (13) includes a main spray pipe and a plurality of nozzle assemblies. Each nozzle assembly includes a sub-pipe and a nozzle communicating with the sub-pipe. The plurality of nozzle assemblies are arranged at intervals along the height direction of the filter (10). The end of the sub-tube away from the nozzle is connected to the main spray pipe. The end of the main spray pipe away from the sub-tube is used to introduce the desorbent. The nozzle is used to spray the desorbent onto the filter membrane (12). And / or, the purging structure (14) includes a blowing main pipe and a plurality of blowing elements, the plurality of blowing elements being arranged at intervals along the height direction of the filter (10); One end of the blowing element is connected to the blowing main pipe, and the other end has a blowing port. The blowing main pipe is used to introduce the gas into one end of the blowing element so as to blow the gas to the filter membrane (12) through the blowing port.

4. The waste gas treatment device according to claim 2, characterized in that, The number of filters (10) is two, and the two filters (10) are a first filter (A) and a second filter (B); The waste gas treatment device further includes a gas inlet pipe (21), a first inlet pipe (22), and a second inlet pipe (23), wherein the gas inlet pipe (21) is used to introduce the waste gas; One end of the first air inlet pipe (22) is connected to the gas inlet pipe (21), and the other end is connected to the first sub-cavity (15) of the first filter (A). A first switch (F1) is provided in the first air inlet pipe (22). One end of the second air inlet pipe (23) is connected to the gas inlet pipe (21), and the other end is connected to the first sub-cavity (15) of the second filter (B). A second switch (F2) is provided in the second air inlet pipe (23).

5. The waste gas treatment device according to claim 4, characterized in that, The exhaust gas treatment device further includes exhaust pipes (24, 25, 26), which are connected to the second sub-chamber (16) of the first filter (A) and the second sub-chamber (16) of the second filter (B); The exhaust gas treatment device further includes a first connecting pipe (27), one end of which is connected to the purging structure (14) of the first filter (A), and the other end is connected to the exhaust pipe. A third shut-off component (F3) is provided in the first connecting pipe (27). And / or, the exhaust gas treatment device further includes a second connecting pipe (28), one end of which is connected to the purging structure (14) of the second filter (B), and the other end is connected to the exhaust pipe. A fourth shut-off element (F4) is provided in the second connecting pipe (28), and the gas is the filtered exhaust gas.

6. The waste gas treatment device according to claim 5, characterized in that, The exhaust gas treatment device also includes a connecting pipe (29) and a booster fan (70); The booster fan (70) is located in the connecting pipe (29), one end of the connecting pipe (29) is connected to the exhaust pipe, and the first connecting pipe (27) and the second connecting pipe (28) are both connected to the other end of the connecting pipe (29).

7. The waste gas treatment apparatus according to any one of claims 4 to 6, characterized in that, The waste gas treatment device further includes a condenser (50), inlet pipes (31, 32, 33) and outlet pipes (34, 35, 36), wherein the condenser (50) has a gas inlet and a gas outlet; The inlet pipes (31, 32, 33) are connected to the first sub-cavity (15) of the first filter (A) and the first sub-cavity (15) of the second filter (B), and are also connected to the gas inlet. The outlet pipes (34, 35, 36) are connected to the gas outlet, and are also connected to the first sub-cavity (15) of the first filter (A) and the first sub-cavity (15) of the second filter (B).

8. The waste gas treatment device according to claim 7, characterized in that, The waste gas treatment device further includes drain pipes (44, 45, 46, 47), the first filter (A) and the second filter (B) both have drain ports, the condenser (50) has an outlet, and the drain pipes (44, 45, 46, 47) are connected to the drain ports of the first filter (A), the drain ports of the second filter (B), and the outlet.

9. The waste gas treatment apparatus according to any one of claims 4 to 6, characterized in that, The waste gas treatment device also includes a reagent inlet pipe (41), a booster pump (60), a first feed pipe (42), and a second feed pipe (43). The reagent inlet pipe (41) is used to introduce the desorbent, and the booster pump (60) is located in the reagent inlet pipe (41). One end of the first feed pipe (42) is connected to the reagent inlet pipe (41), and the other end is connected to the spray structure (13) of the first filter (A). A fifth shut-off element (F5) is provided in the first feed pipe (42). One end of the second feed pipe (43) is connected to the reagent inlet pipe (41), and the other end is connected to the spray structure (13) of the first filter (A). A sixth shut-off element (F6) is provided in the second feed pipe (43).

10. The waste gas treatment apparatus according to any one of claims 1 to 6, characterized in that, The filter membrane (12) is a hydrophobic filter membrane.

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