Single-section drying unit NMP (N-Methyl Pyrrolidone) recovery device and drying system
By dividing the drying equipment into multiple drying units, each section is equipped with an independent NMP recycling device, efficient processing for different working conditions is achieved, the concentration and adaptability of NMP recycling liquid is improved, and pipeline layout and maintenance are simplified , solves the problems of poor adaptability and low concentration of centralized treatment in the prior art.
Patent Information
- Application Number
- CN202420165133.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-23
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-01-23
AI Technical Summary
The existing NMP recycling device centrally treats the exhaust gas from all section ovens, resulting in poor adaptability for different working conditions, low concentration of NMP recycling liquid, and the device is located outside the factory, and requires long pipe connections, resulting in inconvenient maintenance.
Design a single-stage drying unit NMP recycling device, which is divided into multiple-stage drying units. Each unit is equipped with a condenser, waste liquid recovery tank, exhaust pipe and liquid leakage pipeline, heat exchanger, exhaust gas processor and aerator. Through heat exchange and condensation efficiency adjustment, each drying unit can independently treat exhaust gas, improve adaptability and concentration, and reduce pipeline length.
The NMP recycling adaptability and concentration of each drying unit is improved, the air volume of exhaust treatment is reduced, the pipeline layout and maintenance is simplified, and the outdoor device volume is reduced.
Smart Images
Figure CN222211162U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of coating machines and coating ovens, in particular to a single-stage drying unit NMP recovery device and a drying system. Background Art
[0002] At present, the existing oven NMP recovery device is located outside the factory building, and all the exhaust gases from the ovens are centrally treated together. It mainly includes waste heat recovery unit, condensation recovery unit, exhaust fan and NMP absorption tower. Its working principle is to transport the high-temperature exhaust gas in the coating machine oven to the gas-gas heat exchange device outside the factory building through the centralized external exhaust pipe, so that the temperature of the gas carrying NMP is reduced and then enters the primary condenser and the secondary condenser to further reduce the temperature. When the NMP gas is lower than 60°C, it begins to liquefy and collects the liquefied NMP. A small amount of uncondensed gas passes through the spray absorption tower and uses the characteristics of NMP and water to be miscible, and is absorbed by the sprayed water to further remove the residual NMP. The collected waste liquid then enters the distillation tower, and a relatively pure NMP product is obtained after fractionation.
[0003] However, since the degree of drying of the electrode in each oven section is different, the NMP generated in the exhaust gas is also different. The existing centralized NMP treatment is to centrally treat the exhaust gas of all oven sections together, resulting in poor adaptability to different working conditions and a low concentration of the NMP recovery liquid from the centralized treatment. At the same time, the oven NMP recovery device is located outside the factory building, and the required pipeline length is relatively long. Utility Model Content
[0004] The utility model aims to provide a single-stage drying unit NMP recovery device and a drying system to solve the technical problems that the existing NMP centralized treatment is that the exhaust gas of all the drying ovens is centrally treated together, resulting in poor adaptability to different working conditions and a low concentration of the NMP recovery liquid during the centralized treatment. At the same time, the oven NMP recovery device is arranged outside the factory building, and the required pipeline length is relatively long.
[0005] The utility model provides a single-stage drying unit NMP recovery device, which is used for drying equipment, wherein the drying equipment includes multiple sections of ovens, and the drying equipment is divided into multiple sections of drying units, each section of the drying unit includes at least one section of the oven, and each section of the drying unit is provided with an exhaust port and a return air port, and the single-stage drying unit NMP recovery device includes: a condenser, a waste liquid recovery tank, an exhaust pipe and a leakage pipe;
[0006] The condensers are all arranged on the exhaust duct, and the inlet of the exhaust duct is used to communicate with the exhaust port, so that the wind in the exhaust duct can be discharged to the condenser;
[0007] The condenser has a liquid leakage port, and the liquid leakage pipeline is connected with the liquid leakage port of the condenser and the waste liquid recovery tank.
[0008] As a further technical solution, a heat exchanger and a return air pipeline are also included;
[0009] The heat exchanger is arranged on the return air duct and the exhaust air duct, the condenser is arranged on the return air duct, and the outlet of the return air duct is used to communicate with the return air port;
[0010] The air in the exhaust air duct can be discharged to the return air duct through the heat exchanger and the condenser in sequence, and the air in the return air duct can be discharged to the outlet of the return air duct through the heat exchanger;
[0011] The heat exchanger is used to perform heat exchange between the air in the exhaust duct and the air in the return duct.
[0012] As a further technical solution, it also includes an exhaust gas processor, the outlet of the exhaust pipe is connected to the exhaust gas processor, and the wind in the exhaust pipe can be discharged to the exhaust gas processor through the heat exchanger and the condenser in sequence.
[0013] As a further technical solution, a fresh air inlet is provided on the return air duct, and the fresh air inlet is located between the heat exchanger and the condenser.
[0014] As a further technical solution, it also includes an anemometer, which is arranged on the return air duct and located downstream of the heat exchanger. The anemometer is used to detect the wind speed in the return air duct.
[0015] As a further technical solution, it further comprises a controller, and the condenser and the anemometer are both electrically connected to the controller;
[0016] The controller can adjust the heat exchange efficiency of the condenser according to the wind speed detected by the anemometer.
[0017] The utility model provides a drying system, comprising a drying device and the single-stage drying unit NMP recovery device;
[0018] The single-stage drying unit NMP recovery device is provided in plurality and corresponds one to one with the drying units, and the single-stage drying unit NMP recovery device is provided on one side of the drying unit.
[0019] As a further technical solution, each section of the drying unit includes a section of the oven.
[0020] As a further technical solution, it also includes a first confluence pipe, and the outlets of all the exhaust pipes are connected to the first confluence pipe.
[0021] As a further technical solution, it also includes a second confluence pipeline, all of the leakage pipelines are connected to the second confluence pipeline, and the second confluence pipeline is connected to the waste liquid recovery pool.
[0022] Compared with the prior art, the technical advantages of the single-stage drying unit NMP recovery device and drying system provided by the utility model are:
[0023] The utility model provides a single-stage drying unit NMP recovery device, which is used for drying equipment. The drying equipment includes a plurality of drying ovens, and the drying equipment is divided into a plurality of drying units. Each drying unit includes at least one drying oven, and each drying unit is provided with an exhaust port and a return air port. The single-stage drying unit NMP recovery device includes: a condenser, a waste liquid recovery tank, an exhaust air pipeline and a liquid leakage pipeline. The condensers are all arranged on the exhaust air pipeline, and the inlet of the exhaust air pipeline is used to be connected with the exhaust air outlet, and the wind in the exhaust air pipeline can be discharged to the condenser. The condenser has a liquid leakage port, and the liquid leakage pipeline is connected with the liquid leakage port of the condenser and the waste liquid recovery tank.
[0024] Since the drying equipment is divided into multiple drying units, each drying unit includes at least one oven, and the single-stage drying unit NMP recovery device is used in conjunction with the single-stage drying unit, so that the exhaust gas of each drying unit can be processed by the single-stage drying unit NMP recovery device matched therewith, and the NMP is processed separately according to the working condition of each drying unit, which has higher adaptability than the centralized processing of the exhaust gas of all ovens, reduces the air volume of the external exhaust processing, and the exhaust gas of each drying unit is processed separately according to the working condition to make the concentration of NMP recovery higher, and at the same time, the single-stage drying unit NMP recovery device can be directly arranged on one side of the single-stage drying unit, reducing the number and length of pipelines, and convenient and simple maintenance, and reducing the volume of the outdoor processing device.
[0025] The drying system provided by the utility model comprises a drying device and the above-mentioned single-stage drying unit NMP recovery device; the single-stage drying unit NMP recovery device is provided in multiple and corresponds to the drying unit one by one, and the single-stage drying unit NMP recovery device is provided on one side of the drying unit. Therefore, the technical advantages and effects achieved by the above-mentioned single-stage drying unit NMP recovery device include the technical advantages and effects achieved by the above-mentioned single-stage drying unit NMP recovery device, which will not be elaborated in detail here.
[0026] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0028] Figure 1 A schematic diagram of the structure of a single-stage drying unit NMP recovery device provided in an embodiment of the utility model;
[0029] Figure 2 A schematic diagram of the structure of a single-stage drying unit NMP recovery device with a first confluence pipeline provided in an embodiment of the utility model;
[0030] Figure 3 A schematic flow chart of a single-stage drying unit NMP recovery device provided in an embodiment of the utility model.
[0031] Icons: 1- oven; 2- condenser; 3- waste liquid recovery tank; 4- exhaust pipe; 5- heat exchanger; 6- first confluence pipe; 7- tail gas treatment tower; 8- temperature sensor; 9- flow meter; 10- electric ball valve; 11- exhaust air duct; 12- return air duct; 13- NMP waste liquid line. DETAILED DESCRIPTION
[0032] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0035] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0036] The present invention will be further described in detail below through specific implementation examples in conjunction with the accompanying drawings.
[0037] Specific structure such as Figures 1 to 3 shown.
[0038] The present embodiment provides a single-stage drying unit NMP recovery device, which is used for drying equipment. The drying equipment includes a multi-section oven 1, and the drying equipment is divided into a multi-section drying unit, each section of the drying unit includes at least one section of the oven 1, and each section of the drying unit is provided with an exhaust port and a return air port. The single-stage drying unit NMP recovery device includes: a condenser 2, a waste liquid recovery tank 3, an exhaust air pipeline 4 and a liquid leakage pipeline; the condensers 2 are all arranged on the exhaust air pipeline 4, and the inlet of the exhaust air pipeline 4 is used to communicate with the exhaust air outlet, and the wind in the exhaust air pipeline 4 can be discharged to the condenser 2; the condenser 2 has a liquid leakage port, and the liquid leakage pipeline connects the liquid leakage port of the condenser 2 and the waste liquid recovery tank 3.
[0039] In this embodiment, since the drying equipment is divided into multiple drying units, each drying unit includes at least one oven 1, and the single-stage drying unit NMP recovery device is used in conjunction with the single-stage drying unit, so that the exhaust gas of each drying unit can be processed by the single-stage drying unit NMP recovery device matched therewith, and the NMP is processed separately according to the working conditions of each drying unit. Compared with the centralized treatment of the exhaust gas of all the ovens 1, the adaptability is higher, the air volume of the external exhaust treatment is reduced, and the exhaust gas of each drying unit is processed separately according to the working conditions to make the concentration of NMP recovery higher. At the same time, the single-stage drying unit NMP recovery device can be directly arranged on one side of the single-stage drying unit, reducing the number and length of pipelines, making maintenance convenient and simple, and reducing the volume of the outdoor treatment device.
[0040] The optional technical solution of this embodiment also includes a heat exchanger 5 and a return air duct; the heat exchanger 5 is arranged on the return air duct and the exhaust air duct 4, the condenser 2 is arranged on the return air duct, and the outlet of the return air duct is used to communicate with the return air port; the wind in the exhaust air duct 4 can be discharged to the return air duct through the heat exchanger 5 and the condenser 2 in turn, and the wind in the return air duct can be discharged to the outlet of the return air duct through the heat exchanger 5; the heat exchanger 5 is used to perform heat exchange between the wind in the exhaust air duct 4 and the wind in the return air duct.
[0041] In this embodiment, the heat exchanger 5 and the condenser 2 are fixedly connected by bolts, and the exhaust gas in the drying unit enters the exhaust duct 4 through the exhaust port, and flows through the heat exchanger 5 and the condenser 2 in sequence, and then enters the return air duct. The air in the return air duct then flows through the heat exchanger 5 and exchanges heat with the air in the exhaust duct 4 to above 70°C through the heat exchanger 5, and then flows back into the return air port, thereby realizing the recycling of hot air. Among them, the air in the exhaust duct 4 enters the condenser 2 after heat exchange with the air in the return air duct to cool the exhaust gas to about 25°C, and the NMP in the exhaust gas is cooled and liquefied. Due to the influence of gravity, it is discharged to the leakage duct through the leakage port at the bottom of the condenser 2.
[0042] In this embodiment, the heat exchanger 5 is composed of an inner core and a shell, wherein the inner core adopts a cross-type heat exchange, that is, the hot air channel and the cold air channel are arranged in a cross shape, and are fixed to the shell by welding to form a heat exchange component.
[0043] The optional technical solution of this embodiment also includes an exhaust gas processor, the outlet of the exhaust duct 4 is connected to the exhaust gas processor, and the wind in the exhaust duct 4 can be discharged to the exhaust gas processor through the heat exchanger 5 and the condenser 2 in sequence.
[0044] In this embodiment, a part of the air in the exhaust duct 4 enters the return air duct after passing through the condenser 2, and the other part enters the exhaust gas processor through the exhaust duct 4, and is further processed before being discharged to avoid polluting the environment.
[0045] Specifically, the front end of the drying equipment is provided with a feed port for the electrode to enter, and the rear end of the drying equipment is provided with a discharge port for the electrode to exit. The feed port and the discharge port are connected to the outside world. During operation, the air pressure inside the drying equipment must be lower than the external air pressure, otherwise the NMP-containing waste gas generated will be discharged to the external environment along the feed port and the discharge port. When the waste gas is discharged to the exhaust duct 4 through the exhaust port of each section of the drying unit, some gas will enter the feed port and the discharge port of the drying equipment, but it is impossible to detect how much gas has entered, so part of the air coming out of the condenser 2 enters the return air duct, and part of it is discharged to the exhaust gas processor through the exhaust duct 4, so as to ensure the air pressure inside each section of the drying unit.
[0046] In this embodiment, the wind from the exhaust port passes through the heat exchanger, the condenser 2 and the tail gas treatment tower 7 in sequence to form an exhaust air path 11, wherein a part of the wind discharged from the condenser 2 enters the tail gas treatment tower 7 to participate in the formation of the exhaust air path 11, and the other part passes through the heat exchanger 5 in sequence and then flows back to the return air port to form a return air path 12, and the NMP waste liquid discharged from the leakage port of the condenser 2 flows to the waste liquid recovery tank 3 to form an NMP waste liquid liquid path 13.
[0047] In this embodiment, the exhaust gas processor may be an exhaust gas treatment tower 7 arranged outside the factory building, but is not limited thereto and may also be other devices capable of treating exhaust gas as long as the requirements are met.
[0048] In the optional technical solution of this embodiment, a fresh air inlet is provided on the return air duct, and the fresh air inlet is located between the heat exchanger 5 and the condenser 2. The wind in the return air duct has a certain flow rate so that the pressure in the return air duct is lower than the external pressure, so that the external fresh air can enter the return air duct through the fresh air inlet and flow back after passing through the heat exchanger 5. The setting of the fresh air inlet can effectively maintain the air pressure in the drying unit.
[0049] The optional technical solution of this embodiment also includes an anemometer, which is arranged on the return air duct and located downstream of the heat exchanger 5. The anemometer is used to detect the wind speed in the return air duct. The heat exchange efficiency of the condenser 2 is adjusted according to the wind speed information in the return air duct to improve the NMP recovery effect and the stability of the overall air pressure of the system.
[0050] The optional technical solution of this embodiment further includes a controller, and the condenser 2 and the anemometer are both electrically connected to the controller; the controller can adjust the heat exchange efficiency of the condenser 2 according to the wind speed detected by the anemometer.
[0051] Specifically, the condenser 2 is mainly used for surface cooling heat exchange of hot air after waste heat exchange in the exhaust pipe 4. The condenser 2 is mainly composed of a surface cooler, a wire mesh demister and a sealing plate shell. The surface cooler is welded by fin tubes, and the first-stage surface cooler, the second-stage surface cooler and the wire mesh demister are fixed in sequence through the shell. The surface cooler is externally connected to a cooling water pipe, a liquid temperature sensor 8, a flow meter 9 and an electric ball valve 10.
[0052] Among them, the condensation efficiency, i.e., the heat exchange efficiency, of the condenser 2 is controlled by the flow rate of cooling water. The amount of water entering the condenser 2 is controlled by the detection of the flow meter 9 and the opening and closing angle of the electric ball valve 10, so as to match the condensation requirements of the single-stage drying unit with different air volumes. The anemometer is preferably arranged at the return air port, and the detected return air volume information is fed back to the controller, and the controller controls the opening and closing degree of the electric ball valve 10 to adapt to the current demand. The cooling water flow rate is individually adjustable to achieve individual control of the single-stage drying unit under different working conditions, so that the air volume of the exhaust duct 4 and the capacity of the condenser 2 are closed-loop controlled by the controller according to the different working conditions of the single-stage drying unit.
[0053] The present embodiment provides a drying system, comprising a drying device and the above-mentioned single-stage drying unit NMP recovery device; the single-stage drying unit NMP recovery device is provided in multiple and corresponds to the drying unit one by one, and the single-stage drying unit NMP recovery device is provided on one side of the drying unit. Therefore, the technical advantages and effects achieved by the drying system include the technical advantages and effects achieved by the above-mentioned single-stage drying unit NMP recovery device, which will not be repeated here.
[0054] In the optional technical solution of this embodiment, each drying unit includes an oven 1. Since the NMP generated in the exhaust gas of each oven 1 is different, each oven 1 is equipped with a single-stage drying unit NMP recovery device, which can be set according to the different working conditions of each oven 1. The concentration of NMP recovery is high, and the individual control of the single oven 1 under different working conditions is also realized.
[0055] The optional technical solution of this embodiment also includes a first converging pipe 6, and the outlets of all exhaust pipes 4 are connected to the first converging pipe 6. After the flow is concentrated and converging, it is discharged together to reduce the laying of pipes. It should be noted that the outlet of the exhaust pipe 4 refers to the port of the exhaust pipe 4 located downstream of the condenser 2.
[0056] The optional technical solution of this embodiment also includes a second confluence pipeline, all leaking pipelines are connected to the second confluence pipeline, and the second confluence pipeline is connected to the waste liquid recovery pool 3. After the concentrated confluence, the waste liquid is discharged together to reduce the laying of pipelines.
[0057] In this embodiment, the tail gas treatment tower 7 and the waste liquid recovery pool 3 are located outside the factory building, the drying equipment is set in the factory building, the heat exchanger 5 and the condenser 2 are set in the factory building and located on one side of the single-stage drying unit, which is convenient and simple to maintain, and at the same time reduces the volume of the outdoor treatment device. All exhaust pipes 4 are connected to the tail gas treatment tower 7 through the first confluence pipe 6, and all leakage pipes are connected to the waste liquid recovery pool 3 through the second confluence pipe, reducing the laying of pipes.
[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.
Claims
1. A single-stage drying unit NMP recovery device, used for a drying device, the drying device comprising a plurality of drying ovens (1), and the drying device is divided into a plurality of drying units, each drying unit comprising at least one drying oven (1), each drying unit being provided with an exhaust port and a return air port, characterized in that: The single-stage drying unit NMP recovery device comprises: a condenser (2), a waste liquid recovery tank (3), an exhaust pipeline (4) and a liquid leakage pipeline; The condensers (2) are all arranged on the exhaust duct (4), and the inlet of the exhaust duct (4) is used to communicate with the exhaust port, so that the wind in the exhaust duct (4) can be discharged to the condensers (2); The condenser (2) has a liquid leakage port, and the liquid leakage pipeline is connected to the liquid leakage port of the condenser (2) and the waste liquid recovery pool (3).
2. The single-stage drying unit NMP recovery device according to claim 1, characterized in that: It also includes a heat exchanger (5) and a return air pipeline; The heat exchanger (5) is arranged on the return air pipeline and the exhaust air pipeline (4), the condenser (2) is arranged on the return air pipeline, and the outlet of the return air pipeline is used to communicate with the return air port; The air in the exhaust air pipeline (4) can be discharged to the return air pipeline through the heat exchanger (5) and the condenser (2) in sequence, and the air in the return air pipeline can be discharged to the outlet of the return air pipeline through the heat exchanger (5); The heat exchanger (5) is used to perform heat exchange between the air in the exhaust duct (4) and the air in the return duct.
3. The single-stage drying unit NMP recovery device according to claim 2, characterized in that: It also includes an exhaust gas processor, the outlet of the exhaust pipe (4) is connected to the exhaust gas processor, and the wind in the exhaust pipe (4) can be discharged to the exhaust gas processor through the heat exchanger (5) and the condenser (2) in sequence.
4. The single-stage drying unit NMP recovery device according to claim 3, characterized in that: The return air duct is provided with a fresh air inlet, and the fresh air inlet is located between the heat exchanger (5) and the condenser (2).
5. The single-stage drying unit NMP recovery device according to claim 2, characterized in that: It also includes an anemometer, which is arranged on the return air duct and located downstream of the heat exchanger (5), and is used to detect the wind speed in the return air duct.
6. The single-stage drying unit NMP recovery device according to claim 5, characterized in that: It also includes a controller, and the condenser (2) and the anemometer are both electrically connected to the controller; The controller can adjust the heat exchange efficiency of the condenser (2) through the wind speed detected by the anemometer.
7. A drying system, characterized in that: It comprises a drying device and a single-stage drying unit NMP recovery device according to any one of claims 1 to 6; The single-stage drying unit NMP recovery device is provided in plurality and corresponds one to one with the drying units, and the single-stage drying unit NMP recovery device is provided on one side of the drying unit.
8. The drying system according to claim 7, characterized in that: Each section of the drying unit comprises a section of the drying oven (1).
9. The drying system according to claim 7, characterized in that: It also comprises a first converging pipeline (6), and the outlets of all the exhaust pipelines (4) are connected to the first converging pipeline (6).
10. The drying system according to claim 7, characterized in that: It also includes a second confluence pipeline, all of the leaking pipelines are connected to the second confluence pipeline, and the second confluence pipeline is connected to the waste liquid recovery pool (3).