An exhaust gas treatment device

Abstract

This application discloses a waste gas treatment device, including a shell, an inlet pipe, a liquid tank, and a spraying structure. The liquid tank is located inside the shell and contains absorbent liquid. The inlet pipe passes through the shell and communicates with the liquid tank, allowing waste gas to be introduced into the liquid tank for absorption of organic components in the waste gas by the absorbent liquid. The shell has an exhaust port, and the spraying structure is located inside the shell, between the liquid tank and the exhaust port. The spraying structure is arranged at intervals with the liquid tank and is used to spray absorbent liquid towards the liquid tank. In this application, by dual absorption of waste gas from the absorbent liquid, the treatment effect on organic components in the waste gas can be improved, thereby meeting environmental protection and safety requirements.

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] In the lithium battery manufacturing process, a vacuum pump is needed in the cell baking stage. The vacuum pump extracts some light components that volatilize during the cell baking process and then discharges them from the exhaust port of the vacuum pump.

[0003] The exhaust gas emitted by the aforementioned vacuum pump contains a small amount of NMP (dimethylpyrrolidone). In related technologies, a condenser can be installed at the end of the vacuum pump to condense and recover the NMP in the exhaust gas.

[0004] However, the above methods are not very effective at treating NMP in exhaust gas. Utility Model Content

[0005] This application aims to provide an exhaust gas treatment device that can solve the problem of poor NMP treatment effect in exhaust gas.

[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 housing, an air inlet pipe, a liquid pool, and a spraying structure;

[0008] The liquid pool is located inside the shell and contains an absorbent liquid. The air inlet pipe passes through the shell and is connected to the liquid pool. The air inlet pipe is used to introduce waste gas into the liquid pool so that the organic components in the waste gas can be absorbed by the absorbent liquid.

[0009] The housing has an exhaust port, and the spraying structure is disposed inside the housing and located between the liquid pool and the exhaust port. The spraying structure is arranged at intervals with the liquid pool and is used to spray absorbent liquid toward the liquid pool.

[0010] Optionally, the waste gas treatment device further includes an aeration structure, which includes an air pipe and multiple aeration heads;

[0011] Multiple aeration heads are connected to the air vent pipe, which is located inside the liquid pool and is connected to the air inlet pipe. The absorbent liquid in the liquid pool at least submerges the aeration heads.

[0012] Optionally, the number of aeration structures is multiple;

[0013] The liquid pool has a circumferential direction, and a plurality of aeration structures are arranged at intervals along the circumferential direction of the liquid pool; or, the liquid pool has a longitudinal direction, and a plurality of aeration structures are arranged at intervals along the longitudinal direction of the liquid pool.

[0014] The waste gas treatment device also includes a connecting member, one end of which is connected to the air pipes in the plurality of aeration structures, and the other end of which is connected to the air inlet pipe.

[0015] Optionally, the exhaust gas treatment device further includes a condenser, which is disposed inside the housing and located between the spray structure and the exhaust port.

[0016] Optionally, the exhaust gas treatment device further includes a temperature detection element and an exhaust pipe, the exhaust pipe being connected to the exhaust port, and the temperature detection element being disposed inside the exhaust pipe;

[0017] The waste gas treatment device further includes a first pipe and a first valve disposed in the first pipe. The first pipe is connected to the condenser and is used to introduce a heat exchange medium into the condenser.

[0018] The waste gas treatment device also includes a controller, which is electrically connected to the temperature detection element and the first valve.

[0019] Optionally, the condenser is a spiral condenser, which includes a condenser tube wound into a spiral shape.

[0020] Optionally, the waste gas treatment device further includes a circulation pipe, a circulation pump disposed in the circulation pipe, and a second valve disposed in the circulation pipe. One end of the circulation pipe is connected to the liquid pool, and the other end of the circulation pipe is connected to the spraying structure.

[0021] Optionally, the waste gas treatment device further includes an exhaust pipe connected to the end of the liquid pool away from the spray structure, and a third valve is provided in the exhaust pipe.

[0022] Optionally, the waste gas treatment device further includes a conductivity detector and a controller. The conductivity detector is disposed in the liquid pool, and the controller is electrically connected to the conductivity detector and the third valve.

[0023] Optionally, the waste gas treatment device further includes a liquid replenishment pipe, a liquid level detection device, and a fourth valve disposed in the liquid replenishment pipe. The liquid replenishment pipe is connected to the liquid pool and is used to replenish absorbent liquid into the liquid pool.

[0024] The liquid level detection device is installed in the liquid pool, and the controller is electrically connected to the liquid level detection device and the fourth valve.

[0025] In the embodiments of this application, the absorbent in the liquid pool can absorb most of the organic components in the waste gas, and the absorbent sprayed down by the spray structure can further absorb the organic components in the waste gas. Through the dual absorption of waste gas in the absorbent, the treatment effect of organic components in the waste gas can be improved to meet environmental protection and safety requirements.

[0026] 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

[0027] 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:

[0028] Figure 1 This is a schematic diagram of the overall structure of the waste gas treatment device provided in the embodiments of this application;

[0029] Figure 2 This is a schematic diagram of the aeration structure in the main body of the waste gas treatment device provided in the embodiments of this application;

[0030] Figure 3 This is a schematic diagram of the structure of the condenser in the main body of the waste gas treatment device provided in the embodiments of this application;

[0031] Figure 4 This is a schematic diagram of the processing flow of the waste gas treatment device provided in the embodiments of this application.

[0032] Figure label:

[0033] 10-Pipeline assembly, 11-Inlet pipe, 12-Exhaust pipe, 13-First pipe, 14-Second pipe, 15-Circulation pipe, 16-Discharge pipe, 17-Replenishment pipe;

[0034] 20-Aeration component, 21-Connecting part, 22-Aeration structure, 221-Vent pipe, 222-Aeration head, 30-Treatment component, 31-Liquid tank, 32-Spraying structure, 33-Condenser, 331-Condenser pipe, 40-Shell, 41-Exhaust port;

[0035] 50-Valve assembly, 51-First valve, 52-Second valve, 53-Third valve, 54-Fourth valve, 55-Fifth valve, 56-Sixth valve; 60-Detection assembly, 61-Temperature sensor, 62-Conductivity sensor, 63-Level sensor, 64-Liquid pressure sensor, 70-Controller, 80-Circulation pump. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] like Figure 1As shown, a viscosity measuring mechanism according to some embodiments of this application includes a housing 40, an air inlet pipe 11, a liquid pool 31, and a spraying structure 32. The liquid pool 31 is disposed inside the housing 40 and contains an absorbent liquid. The air inlet pipe 11 passes through the housing 40 and communicates with the liquid pool 31. The air inlet pipe 11 is used to introduce waste gas into the liquid pool 31 so that the organic components in the waste gas can be absorbed by the absorbent liquid. The housing 40 has an exhaust port 41. The spraying structure 32 is disposed inside the housing 40 and is located between the liquid pool 31 and the exhaust port 41. The spraying structure 32 is arranged at intervals with the liquid pool 31 and is used to spray the absorbent liquid toward the liquid pool 31.

[0042] A vacuum pump is used during the cell baking process to extract some light components that evaporate during baking and discharge them from the pump's exhaust port. This exhaust gas contains organic components, such as NMP (dimethylpyrrolidone). NMP is miscible with pure water in any proportion and has a low dew point. NMP is corrosive, so the casing 40 can be made of a corrosion-resistant material, such as stainless steel. The liquid tank 31 can be made of the same material as the casing 40.

[0043] Except for the vent 41, all other openings on the housing 40 are not exposed. For example, openings for pipes to pass through are not exposed to ensure the airtightness of the housing 40, thereby preventing NMP leakage and improving safety. The housing 40 can be installed off the ground, and multiple supports can be connected to the bottom of the housing 40 to support it.

[0044] The housing 40 has a height direction, which can be referenced. Figure 1 The direction indicated by arrow A. The cross-section of the housing 40 perpendicular to its height direction can be circular, square, etc. The end of the inlet pipe 11 away from the housing 40 can be connected to the exhaust port of the vacuum pump. The inlet pipe 11 can be installed at the bottom of the housing 40, and a sixth valve 56 can be provided in the inlet pipe 11. The sixth valve 56 can be an on / off valve or an adjustable flow valve. One end of the inlet pipe 11 extends out of the housing 40 and is used to introduce exhaust gas, while the other end of the inlet pipe 11 extends into the liquid pool 31. When the sixth valve 56 is open, the exhaust gas is sent to the liquid pool 31 through the inlet pipe 11.

[0045] The height direction of the liquid pool 31 is aligned with the height direction of the shell 40. The shape of the cross-section of the liquid pool 31 perpendicular to its height direction is the same as the shape of the cross-section of the shell 40. For example, as... Figure 2 As shown, the cross-sectional shape of the liquid pool 31 is circular.

[0046] The absorbent is a solution capable of absorbing NMP from waste gas. The absorbent may include at least one of water, pure water, and alkaline solution. Absorption of NMP from waste gas by the absorbent means that the NMP in the waste gas dissolves in the absorbent. Initially, the absorbent does not contain NMP. After absorbing NMP, the absorbent contains NMP, and the concentration of NMP in the absorbent continuously increases as the absorption process continues. Since NMP is miscible with pure water in any proportion, pure water is preferably used as the absorbent to maximize the removal of NMP from the waste gas.

[0047] It should be noted that, in order to prevent the absorbent in the liquid pool 31 from flowing back into the air inlet pipe 11 along the air inlet path, a certain positive pressure must be maintained in the air inlet pipe 11.

[0048] Along the height of the housing 40, the distance between the spraying structure 32 and the liquid pool 31 can be greater than or equal to 20 cm. The absorbent sprayed by the spraying structure 32 eventually falls into the liquid pool 31. The spraying structure 32 may include a spray pipe and multiple nozzles, all of which are connected to the spray pipe and are arranged at intervals along the length of the spray pipe. Each nozzle has several spray holes, the diameter of which can be on the micrometer scale.

[0049] The absorbent sprayed by the spraying structure 32 can originate from the liquid tank 31 or from an external storage device. When the absorbent sprayed by the spraying structure 32 originates from the liquid tank 31, its composition is the same as that of the absorbent in the liquid tank 31. When the absorbent sprayed by the spraying structure 32 originates from an external storage device, its composition can differ from that of the absorbent in the liquid tank 31.

[0050] In this embodiment, the liquid pool 31, spraying structure 32, and exhaust port 41 are arranged sequentially from the lower end to the upper end of the housing 40. The waste gas containing NMP first enters the liquid pool 31 through the inlet pipe 11. Most of the NMP in the waste gas dissolves in the absorbent liquid within the liquid pool 31, meaning the absorbent liquid absorbs the NMP. Then, the waste gas containing water vapor and a small amount of NMP flows upwards, coming into counter-current contact with the absorbent liquid sprayed down by the spraying structure 32. The absorbent liquid sprayed down by the spraying structure 32 further absorbs the NMP in the waste gas. Finally, the waste gas is discharged into the atmosphere through the exhaust port 41.

[0051] In the embodiments of this application, the absorbent in the liquid pool 31 can absorb most of the organic components in the waste gas, and the absorbent sprayed by the spraying structure 32 can further absorb the organic components in the waste gas. Through the dual absorption of the waste gas in the absorbent, the treatment effect of the organic components in the waste gas can be improved to meet environmental protection and safety requirements.

[0052] In some embodiments, refer to Figure 1 and Figure 2The waste gas treatment device also includes an aeration structure 22, which includes an air pipe 221 and multiple aeration heads 222. The multiple aeration heads 222 are all connected to the air pipe 221. The air pipe 221 is located in the liquid tank 31 and is connected to the air inlet pipe 11. The absorbent liquid in the liquid tank 31 at least submerges the aeration heads 222.

[0053] The liquid level of the absorbent in the liquid tank 31 can be approximately 20 cm above the upper surface of the aeration heads 222. The number of aeration heads 222 in the aeration structure 22 can be set according to actual needs, for example, it can be set to 4-12. Multiple aeration heads 222 in the aeration structure 22 are arranged at intervals along the length of the air pipe 221. The aeration heads 222 can be disc-shaped, and the distance between two adjacent aeration heads 222 in the aeration structure 22 can be greater than or less than the diameter of the aeration head 222.

[0054] The aeration head 222 has a gas inlet and several micropores. The gas inlet is connected to the air vent 221, and the pore size is on the micrometer scale. The waste gas containing NMP enters the air vent 221 through the air inlet 11, and then enters the aeration head 222 through the air vent 221. The waste gas is dispersed into several tiny bubbles by the several micropores, and the tiny bubbles are introduced into the absorbent liquid in the liquid tank 31 and mixed thoroughly with the absorbent liquid.

[0055] In this embodiment of the application, by setting the aeration head 222, the waste gas can be dispersed into several tiny bubbles before it enters the absorbent liquid in the liquid tank 31, so as to increase the gas-liquid contact area, so that the NMP in the waste gas can be fully dissolved in the absorbent liquid, thereby improving the treatment effect of NMP in the waste gas and increasing the dissolution rate of NMP.

[0056] In some embodiments, the number of aeration structures 22 is multiple; see reference Figure 2 The liquid pool 31 has a circumferential direction, and multiple aeration structures 22 are arranged at intervals along the circumference of the liquid pool 31; the waste gas treatment device also includes a connecting member 21, one end of which is connected to the air pipe 221 in the multiple aeration structures 22, and the other end of which is connected to the air inlet pipe 11.

[0057] The connecting member 21 and the aeration structure 22 together form the aeration assembly 20. The number of aeration structures 22 can be 3 to 10. The connecting member 21 can be a multi-port connector, and it connects to the inner end of multiple vent pipes 221 near the center of the liquid tank 31. As an example, there are 4 aeration structures 22, 4 vent pipes 221, and the connecting member 21 is a five-port connector, connecting to the 4 vent pipes 221 and also to the air inlet pipe 11. In this embodiment, the multiple aeration structures 22 can disperse the waste gas into several microbubbles that are evenly distributed within the liquid tank 31, thereby improving the dissolution rate of NMP.

[0058] In some embodiments, the liquid pool 31 has a length direction. For example, the cross-section of the liquid pool 31 is square, and the square liquid pool 31 has a length direction. A plurality of aeration structures 22 are arranged at intervals along the length direction of the liquid pool 31.

[0059] In some embodiments, the exhaust gas treatment device further includes a condenser 33, which is disposed within the housing 40 and located between the spray structure 32 and the exhaust port 41.

[0060] In this embodiment, the liquid pool 31, spray structure 32, condenser 33, and exhaust port 41 are arranged sequentially from the lower end to the upper end of the housing 40. The liquid pool 31, spray structure 32, and condenser 33 constitute the processing assembly 30. Along the height direction of the housing 40, the distance between the spray structure 32 and the condenser 33 can be greater than the distance between the spray structure 32 and the liquid pool 31. The condenser 33 is used to condense the exhaust gas containing water vapor and a small amount of NMP.

[0061] Reference Figure 4 The waste gas containing NMP first enters the liquid tank 31 through the inlet pipe 11. Most of the NMP in the waste gas dissolves into the absorbent liquid in the liquid tank 31, meaning the absorbent liquid absorbs the NMP. Then, the waste gas containing water vapor and a small amount of NMP flows upwards, coming into counter-current contact with the absorbent liquid sprayed down by the spray structure 32. The absorbent liquid sprayed down by the spray structure 32 further absorbs the NMP in the waste gas. Afterwards, the waste gas containing water vapor and trace amounts of NMP flows upwards through the condenser 33, where it condenses the waste gas containing water vapor and a small amount of NMP. Finally, the waste gas is discharged into the atmosphere through the exhaust port 41. When the condenser 33 condenses the waste gas containing water vapor and a small amount of NMP, the water vapor condenses into condensate, which falls into the liquid tank 31. In this embodiment, the condenser 33 can condense the waste gas containing water vapor and a small amount of NMP. During the condensation process, the water vapor can absorb some of the NMP, further treating the NMP in the waste gas.

[0062] The waste gas treatment device also includes a first pipe 13 and a second pipe 14, both of which are connected to a condenser 33. The first pipe 13 is used to introduce a heat exchange medium into the condenser 33, and the second pipe 14 is used to supply the heat exchange medium for outflow. A first valve 51 is provided in the first pipe 13, and a fifth valve 55 is provided in the second pipe 14. The first valve 51 can be an adjustable flow valve, and the fifth valve 55 can be an on / off valve. The heat exchange medium can be chilled water.

[0063] In some embodiments, the exhaust gas treatment device further includes a temperature detection element 61 and an exhaust pipe 12, the exhaust pipe 12 being connected to an exhaust port 41, and the temperature detection element 61 being disposed inside the exhaust pipe 12; the exhaust gas treatment device further includes a first pipe 13 and a first valve 51 disposed in the first pipe 13, the first pipe 13 being connected to a condenser 33, and the first pipe 13 being used to introduce a heat exchange medium into the condenser 33; the exhaust gas treatment device further includes a controller 70, the controller 70 being electrically connected to the temperature detection element 61 and the first valve 51.

[0064] Temperature detection element 61 can be a temperature sensor, used to detect the real-time temperature of exhaust gas passing through exhaust pipe 12. First valve 51 is an adjustable flow valve. Controller 70 can be a programmable logic controller (PLC). Controller 70 is also electrically connected to fifth valve 55.

[0065] When the condenser 33 condenses the exhaust gas, it lowers the temperature of the exhaust gas; that is, the temperature of the exhaust gas decreases after passing through the condenser 33. If the temperature of the exhaust gas after passing through the condenser 33 is less than or equal to the first set value, it indicates that the condenser 33 has a good condensation effect. If the temperature of the exhaust gas passing through the exhaust pipe 12 is high, it indicates that the condenser 33 has an insufficient condensation effect, and the high-temperature exhaust gas will undergo uncontrolled condensation in subsequent pipes.

[0066] The controller 70 controls the opening of the first valve 51 based on the real-time temperature detected by the temperature sensor 61. For example, if the real-time temperature detected by the temperature sensor 61 is greater than a first set value, the opening of the first valve 51 is increased to ensure the condensation effect. In this embodiment, by detecting the temperature of the exhaust gas passing through the exhaust pipe 12 and controlling the opening of the first valve 51 accordingly, the condensation effect of the condenser 33 can be ensured, and the temperature of the discharged exhaust gas can be controlled to prevent the discharged exhaust gas from condensing at subsequent pipes.

[0067] In some embodiments, refer to Figure 3 The condenser 33 is a spiral condenser, which includes a condenser tube 331, which is coiled into a spiral shape.

[0068] Specifically, the spiral condenser is planar and spiral-shaped. Multiple spiral condensers can be arranged at intervals along the height of the shell 40. The number of spiral condensers can be 2 to 4. In this embodiment, the spiral condenser has good condensation effect, and the spiral structure guides the condensate to fall naturally, preventing it from splashing out.

[0069] In some embodiments, the exhaust gas treatment device further includes a circulation pipe 15, a circulation pump 80 disposed in the circulation pipe 15, and a second valve 52 disposed in the circulation pipe 15. One end of the circulation pipe 15 is connected to the liquid pool 31, and the other end of the circulation pipe 15 is connected to the spraying structure 32.

[0070] The second valve 52 can be an on / off valve or a valve with adjustable flow rate. The controller 70 is electrically connected to the circulating pump 80 and the second valve 52. The controller 70 is used to control the start, stop and speed of the circulating pump 80, and to control the opening and closing of the second valve 52.

[0071] The circulation pump 80 is used to pump the absorbent liquid in the liquid pool 31 into the spray structure 32, thereby realizing the recycling of the absorbent liquid and stabilizing the liquid level of the absorbent liquid in the liquid pool 31 within a certain range, avoiding the continuous accumulation of absorbent liquid and continuous rise in liquid level in the liquid pool 31 caused by the continuous introduction of absorbent liquid from the outside into the spray structure 32.

[0072] In some embodiments, the waste gas treatment device further includes a liquid pressure detection element 64, which is disposed in the circulation pipe 15 and located on the pump outlet side of the circulation pump 80. The liquid pressure detection element 64 is used to detect the pressure of the absorbent pumped out by the circulation pump 80. The pressure of the absorbent supplied to the spray structure 32 needs to be stabilized within a certain range. By detecting the pressure of the absorbent pumped out by the circulation pump 80 and controlling the rotation speed of the circulation pump 80 accordingly, the pressure of the absorbent supplied to the spray structure 32 can be stabilized within a certain range.

[0073] In some embodiments, the exhaust gas treatment device further includes an exhaust pipe 16, which is connected to the end of the liquid pool 31 away from the spray structure 32, and a third valve 53 is provided in the exhaust pipe 16.

[0074] The third valve 53 can be an on / off valve. The controller 70 is electrically connected to the third valve 53 and is used to control the opening and closing of the third valve 53. The absorbent liquid in the liquid pool 31 can be discharged through the discharge pipe 16, thereby facilitating the subsequent replacement of the absorbent liquid.

[0075] In some embodiments, the exhaust gas treatment device further includes a conductivity detector 62 and a controller 70. The conductivity detector 62 is disposed in the liquid pool 31, and the controller 70 is electrically connected to the conductivity detector 62 and the third valve 53.

[0076] The conductivity detection element 62 can be a conductivity sensor, used to detect the conductivity of the absorbent in the liquid pool 31. The conductivity of the absorbent reflects the concentration of NMP in the absorbent. If the conductivity of the absorbent is greater than a second set value, it indicates that the NMP concentration in the absorbent is high, and the absorbent needs to be replaced.

[0077] The controller 70 specifically controls the opening and closing of the third valve 53 based on the conductivity of the absorbent in the liquid pool 31 detected by the conductivity detector 62. For example, when the conductivity of the absorbent in the liquid pool 31 detected by the conductivity detector 62 is greater than a second set value, the controller controls the third valve 53 to open; when the conductivity of the absorbent in the liquid pool 31 detected by the conductivity detector 62 is less than or equal to the second set value, the controller controls the third valve 53 to remain closed. In this embodiment, when the NMP concentration in the absorbent is high, the controller 70 will control the third valve 53 to open to discharge the absorbent, preventing the treatment effect of NMP in the exhaust gas from being affected by the absorbent with a high NMP concentration remaining in the liquid pool 31.

[0078] In some embodiments, the exhaust gas treatment device further includes a replenishment pipe 17, a liquid level detection element 63, and a fourth valve 54 disposed in the replenishment pipe 17. The replenishment pipe 17 is connected to the liquid pool 31 and is used to replenish the absorbent liquid into the liquid pool 31. The liquid level detection element 63 is disposed in the liquid pool 31, and the controller 70 is electrically connected to the liquid level detection element 63 and the fourth valve 54.

[0079] Specifically, the replenishment pipe 17 is used to replenish the liquid pool 31 with an absorbent solution that does not contain NMP, such as pure water. The end of the replenishment pipe 17 away from the housing 40 is connected to an external liquid storage device, which is used to store the absorbent solution that does not contain NMP, such as pure water.

[0080] The level detection element 63 can be a level sensor, used to detect the level of the absorbent liquid in the liquid pool 31. The fourth valve 54 can be an on / off valve. The controller 70 is used to control the opening and closing of the fourth valve 54. The controller 70 controls the fourth valve 54 to open simultaneously with the third valve 53. At this time, absorbent liquid without NMP is added to the liquid pool 31 until the conductivity of the absorbent liquid in the liquid pool 31 detected by the conductivity detection element 62 is less than or equal to the second set value, and the level of the absorbent liquid in the liquid pool 31 detected by the level detection element 63 is within the set range, then the fourth valve 54 is controlled to close.

[0081] In this embodiment, the liquid level detection element 63 can detect the liquid level of the absorbent in the liquid tank 31, thereby controlling the amount of water replenished, so that the liquid level of the replaced absorbent is within a set range. In addition, the simultaneous opening of the third valve 53 and the fourth valve 54, during the process of discharging the absorbent while replenishing the absorbent without NMP, will not affect the treatment of NMP in the waste gas, thus enabling continuous treatment of waste gas containing NMP.

[0082] The aforementioned intake pipe 11, exhaust pipe 12, first pipe 13, second pipe 14, circulation pipe 15, discharge pipe 16, and replenishment pipe 17 constitute a pipeline assembly 10. The aforementioned first valve 51, second valve 52, third valve 53, fourth valve 54, fifth valve 55, and sixth valve 56 constitute a valve assembly 50. The aforementioned temperature detection element 61, conductivity detection element 62, liquid level detection element 63, and liquid pressure detection element 64 constitute a detection assembly 60.

[0083] As an example, the process of treating waste gas using the waste gas treatment device provided in the embodiments of this application can be as follows:

[0084] Initially, the sixth valve 56 is open, the third valve 53 and the fourth valve 54 are closed, the first valve 51 and the second valve 52 are open, and the circulation pump 80 is started.

[0085] The NMP-containing waste gas first enters the ventilation pipe 221 through the inlet pipe 11, and then enters the aeration head 222 through the ventilation pipe 221. The waste gas is dispersed into several micro-bubbles by several micro-holes in the aeration head 222. These micro-bubbles are then introduced into the absorbent liquid in the liquid pool 31. Most of the NMP in the waste gas dissolves into the absorbent liquid in the liquid pool 31, that is, the absorbent liquid absorbs NMP. Afterward, the waste gas containing water vapor and a small amount of NMP flows upward and comes into counter-current contact with the absorbent liquid sprayed down by the spray structure 32. The absorbent liquid sprayed down by the spray structure 32 further absorbs the NMP in the waste gas. Afterward, the waste gas containing water vapor and trace amounts of NMP flows upward and passes through the condenser 33. The condenser 33 condenses the waste gas containing water vapor and a small amount of NMP. The water vapor condenses into condensate, which falls into the liquid pool 31. Finally, the waste gas is discharged into the atmosphere through the exhaust port 41.

[0086] After the absorbent liquid sprayed by the spraying structure 32 falls into the liquid pool 31, the circulating pump 80 pumps the absorbent liquid back into the spraying structure 32 to continuously supply absorbent liquid to the spraying structure 32.

[0087] When the conductivity of the absorbent in the liquid pool 31 detected by the conductivity detector 62 is greater than the second set value, the controller 70 controls the third valve 53 to open and simultaneously controls the fourth valve 54 to open. At this time, absorbent without NMP is added to the liquid pool 31 to replace the absorbent until the conductivity of the absorbent in the liquid pool 31 detected by the conductivity detector 62 is less than or equal to the second set value. Then, the controller controls the third valve 53 to close. After that, when the liquid level of the absorbent in the liquid pool 31 detected by the liquid level detector 63 is within the set range, the controller controls the fourth valve 54 to close.

[0088] 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.

[0089] 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, It includes a housing (40), an air inlet pipe (11), a liquid pool (31), and a spraying structure (32); The liquid pool (31) is located inside the shell (40), and the liquid pool (31) contains an absorbent liquid. The air inlet pipe (11) passes through the shell (40) and is connected to the liquid pool (31). The air inlet pipe (11) is used to introduce waste gas into the liquid pool (31) so that the organic components in the waste gas can be absorbed by the absorbent liquid. The housing (40) has an exhaust port (41), and the spraying structure (32) is disposed inside the housing (40) and located between the liquid pool (31) and the exhaust port (41). The spraying structure (32) is arranged at intervals with the liquid pool (31), and the spraying structure (32) is used to spray absorbent liquid toward the liquid pool (31).

2. The waste gas treatment device according to claim 1, characterized in that, The waste gas treatment device also includes an aeration structure (22), which includes an air pipe (221) and multiple aeration heads (222); Multiple aeration heads (222) are connected to the air pipe (221), which is located in the liquid pool (31) and is connected to the air inlet pipe (11). The absorbent liquid in the liquid pool (31) at least submerges the aeration heads (222).

3. The waste gas treatment device according to claim 2, characterized in that, The number of aeration structures (22) is multiple; The liquid pool (31) has a circumferential direction, and a plurality of aeration structures (22) are arranged at intervals along the circumferential direction of the liquid pool (31); or, the liquid pool (31) has a length direction, and a plurality of aeration structures (22) are arranged at intervals along the length direction of the liquid pool (31). The waste gas treatment device also includes a connecting member (21), one end of which is connected to the air pipes (221) in the plurality of aeration structures (22), and the other end of which is connected to the air inlet pipe (11).

4. The waste gas treatment apparatus according to any one of claims 1 to 3, characterized in that, The waste gas treatment device also includes a condenser (33), which is disposed inside the housing (40) and located between the spray structure (32) and the exhaust port (41).

5. The waste gas treatment device according to claim 4, characterized in that, The exhaust gas treatment device also includes a temperature detection element (61) and an exhaust pipe (12), the exhaust pipe (12) being connected to the exhaust port (41), and the temperature detection element (61) being disposed inside the exhaust pipe (12); The waste gas treatment device further includes a first pipe (13) and a first valve (51) disposed in the first pipe (13). The first pipe (13) is connected to the condenser (33) and the first pipe (13) is used to introduce heat exchange medium into the condenser (33). The exhaust gas treatment device also includes a controller (70), which is electrically connected to the temperature detection element (61) and the first valve (51).

6. The waste gas treatment device according to claim 4, characterized in that, The condenser (33) is a spiral condenser, which includes a condenser tube that is coiled into a spiral shape.

7. The waste gas treatment apparatus according to any one of claims 1 to 3, characterized in that, The waste gas treatment device also includes a circulation pipe (15), a circulation pump (80) disposed in the circulation pipe (15), and a second valve (52) disposed in the circulation pipe (15). One end of the circulation pipe (15) is connected to the liquid pool (31), and the other end of the circulation pipe (15) is connected to the spraying structure (32).

8. The waste gas treatment device according to claim 7, characterized in that, The exhaust gas treatment device also includes an exhaust pipe (16), which is connected to the end of the liquid pool (31) away from the spray structure (32), and a third valve (53) is provided in the exhaust pipe (16).

9. The waste gas treatment device according to claim 8, characterized in that, The waste gas treatment device also includes a conductivity detector (62) and a controller (70). The conductivity detector (62) is located in the liquid pool (31), and the controller (70) is electrically connected to the conductivity detector (62) and the third valve (53).

10. The waste gas treatment device according to claim 9, characterized in that, The waste gas treatment device also includes a liquid replenishment pipe (17), a liquid level detection device (63), and a fourth valve (54) disposed in the liquid replenishment pipe (17). The liquid replenishment pipe (17) is connected to the liquid pool (31) and is used to replenish the absorbent liquid into the liquid pool (31). The liquid level detection device (63) is located in the liquid pool (31), and the controller (70) is electrically connected to the liquid level detection device (63) and the fourth valve (54).

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