A drying apparatus for a polymer electrolyte / separator material

Abstract

This disclosure provides a drying apparatus for polymer electrolyte / membrane materials, comprising: a frame, and a conveying mechanism disposed on the frame for continuously conveying the membrane material to be dried; a plurality of functional chambers arranged sequentially and connected along the conveying direction of the membrane material, the plurality of functional chambers including a first drying zone, a second drying zone, and a stabilization zone connected sequentially to form a channel through which the membrane material can continuously pass; a heat exchange fluid circuit, the inlet of which is connected to the gas outlet of the first drying zone and the outlet of which is connected to the gas inlet of the stabilization zone, for conveying heat exchange fluid from the first drying zone to the second drying zone and the stabilization zone to achieve cascade utilization of heat; and a control system connected to the conveying mechanism, the plurality of functional chambers, and the heat exchange fluid circuit.

Description

Technical Field

[0001] This disclosure relates to the field of polymer material manufacturing equipment, and more particularly to a drying apparatus for polymer electrolyte / membrane materials. Background Technology

[0002] In the preparation of polymer electrolyte membranes or battery separators, the drying process after film formation is crucial. The drying quality directly affects the mechanical strength, pore structure, and electrochemical performance of the membrane, thus determining the safety and lifespan of devices such as lithium-ion batteries. Traditional drying equipment often uses a single system, such as hot air or vacuum drying, but it has significant limitations. Although hot air drying is widely used, direct contact between the airflow and the membrane can easily lead to the rapid evaporation of the surface solvent, forming a hard crust, while the internal solvent is trapped and difficult to escape, causing defects such as embrittlement and microcracks. Vacuum drying lowers the boiling point of the solvent through negative pressure, improving uniformity, but it is inefficient, energy-intensive, has poor sealing, and is difficult to scale up for continuous production. In addition, the cooling process is weak, and the dried membrane is prone to stress or reabsorption of ambient vapor due to sudden temperature changes, resulting in "moisture return" and affecting quality.

[0003] Existing improved technologies generally involve simply superimposing or mechanically separating processes such as heating, solvent removal, and cooling. Each functional area is relatively independent, lacking system-level continuous and stable operation, and control over drying quality and energy consumption. Therefore, there is an urgent need for a drying device for polymer electrolyte / membrane materials that can achieve gentle, efficient, continuous, and stable operation, and precisely control the drying atmosphere and thermal history.

[0004] The information disclosed in the background section is only for enhancing the understanding of the background of this utility model, and therefore may contain information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0005] To address the shortcomings of existing technologies, this disclosure provides a drying apparatus for polymer electrolyte / membrane materials.

[0006] To achieve the above objectives, the present disclosure adopts the following technical solution:

[0007] A drying apparatus for polymer electrolyte / membrane materials, comprising:

[0008] The rack, and the following mounted on the rack:

[0009] A conveying mechanism for continuously transporting membrane material to be dried;

[0010] Multiple functional chambers are arranged sequentially and connected along the conveying direction of the membrane material. The multiple functional chambers include a first drying zone, a second drying zone, and a stabilization zone that are connected sequentially to form a channel through which the membrane material can pass continuously.

[0011] The heat exchange fluid circuit has its inlet end connected to the gas outlet of the first drying zone and its outlet end connected to the gas inlet of the stable zone. It is used to transport the heat exchange fluid from the first drying zone to the second drying zone and the stable zone to achieve the cascade utilization of heat.

[0012] The control system is connected to the conveying mechanism, the plurality of functional chambers and the heat exchange fluid circuit respectively.

[0013] In the device, the pressure in the first drying zone is maintained at a slightly negative pressure of -0.01MPa to -0.03MPa; the pressure in the second drying zone is maintained at -0.05MPa to -0.09MPa; and the pressure in the stable zone is maintained at a slightly negative pressure of -0.005MPa to -0.015MPa.

[0014] In the device, the first drying zone and the second drying zone are each independently provided with a heating unit, and the heating unit is located at the bottom of the corresponding functional chamber.

[0015] In the device described above, a solvent vapor inlet is provided in the first drying zone.

[0016] In the device described above, a vacuum system is provided in the second drying zone.

[0017] In the device, a temperature gradient structure is provided in the stable region along the conveying direction of the membrane material.

[0018] The device further includes a return pipeline, the inlet of which is connected to the gas outlet of the second drying zone, and the outlet of which is connected to the gas inlet of the first drying zone.

[0019] In the device described above, the heat exchange fluid circuit is a single heat exchange pipeline, which includes a pipe structure or an air duct structure.

[0020] In the device, the gas outlet of the stable zone is connected to a tail gas treatment system, which includes a condensation recovery device or an absorption tower.

[0021] In the device, the first drying zone, the second drying zone, and the stabilization zone are rigidly connected by flange connection, welding, or bolt connection.

[0022] Compared with the prior art, the beneficial effects of this disclosure are as follows:

[0023] This disclosure provides a drying apparatus for polymer electrolyte / membrane materials. Through rigid three-zone connection and a single heat exchange pipeline, it achieves tiered utilization of heat from the first drying zone to the second drying zone and the stabilization zone, significantly reducing energy consumption. Furthermore, the apparatus integrates atmosphere control, negative pressure drying, tiered heat exchange, and gradient cooling, resulting in a compact structure, high degree of automation, and excellent drying quality, continuous production capacity, and system stability.

[0024] The description provided is merely an overview of the technical solution disclosed herein. In order to make the technical means of this disclosure clearer and more understandable, to the point that those skilled in the art can implement it according to the contents of the specification, and in order to make the described and other objects, features and advantages of this disclosure more obvious and understandable, specific embodiments of this disclosure are illustrated below. Attached Figure Description

[0025] Various other advantages and benefits of this disclosure will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of a drying device for a polymer electrolyte / membrane material provided in this disclosure;

[0027] Figure 2 This is a partial structural schematic diagram of the first drying zone in a drying apparatus for a polymer electrolyte / membrane material provided in this disclosure;

[0028] Figure 3 This is a schematic diagram of the working process of a drying device for a polymer electrolyte / membrane material provided in this disclosure;

[0029] Figure 4 This is a schematic diagram of a drying method for a drying apparatus based on a polymer electrolyte / membrane material provided in this disclosure;

[0030] Figure 5 A comparative data chart of the performance of hot air drying and vacuum drying in one embodiment of this disclosure is provided. Detailed Implementation

[0031] The following will be combined with the appendix Figures 1 to 5The embodiments described herein are provided in detail and are intended to explain, rather than limit, this disclosure. While specific embodiments of this disclosure are shown in the accompanying drawings, it should be understood that this disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art.

[0032] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that different terms may be used to refer to the same component. This specification and claims do not distinguish components based on differences in terminology, but rather on differences in function. The terms "comprising" or "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising but not limited to." The following descriptions of preferred embodiments of this disclosure are for the purpose of implementing the general principles of the specification and are not intended to limit the scope of this disclosure. The scope of protection of this disclosure is determined by the appended claims.

[0033] To facilitate understanding of the embodiments of this disclosure, the following will provide further explanation and description with reference to the accompanying drawings and several specific embodiments, and the accompanying drawings do not constitute a limitation on the embodiments of this disclosure.

[0034] A drying apparatus for polymer electrolyte / membrane materials, comprising:

[0035] The rack, and the following mounted on the rack:

[0036] A conveying mechanism for continuously transporting membrane material to be dried;

[0037] Multiple functional chambers are arranged sequentially and connected along the conveying direction of the membrane material. The multiple functional chambers include a first drying zone, a second drying zone, and a stabilization zone that are connected sequentially to form a channel through which the membrane material can pass continuously.

[0038] The heat exchange fluid circuit has its inlet end connected to the gas outlet of the first drying zone and its outlet end connected to the gas inlet of the stable zone. It is used to transport the heat exchange fluid from the first drying zone to the second drying zone and the stable zone to achieve the cascade utilization of heat.

[0039] The control system is connected to the conveying mechanism, the plurality of functional chambers and the heat exchange fluid circuit respectively.

[0040] In this embodiment, the rigid connection of the three zones and a single heat exchange pipeline enable the cascade utilization of heat from the first drying zone to the second drying zone and the stable zone, significantly reducing energy consumption. Furthermore, the device provided in this disclosure organically integrates atmosphere control, negative pressure drying, cascade heat exchange, and gradient cooling, resulting in a compact structure, high degree of automation, and excellent drying quality, continuous production capacity, and system stability.

[0041] In a preferred embodiment of the device, the pressure in the first drying zone is maintained at a slightly negative pressure of -0.01 MPa to -0.03 MPa; the pressure in the second drying zone is maintained at -0.05 MPa to -0.09 MPa; and the pressure in the stable zone is maintained at a slightly negative pressure of -0.005 MPa to -0.015 MPa.

[0042] In a preferred embodiment of the device, the first drying zone and the second drying zone are each independently provided with a heating unit, and the heating unit is located at the bottom of the corresponding functional chamber.

[0043] In a preferred embodiment of the device, a solvent vapor inlet is provided in the first drying zone.

[0044] In a preferred embodiment of the device, a vacuum system is provided in the second drying zone.

[0045] In a preferred embodiment of the device, a temperature gradient structure is provided in the stable region along the conveying direction of the membrane material.

[0046] In a preferred embodiment of the device, the device further includes a return pipeline, wherein the inlet end of the return pipeline is connected to the gas outlet of the second drying zone, and the outlet end is connected to the gas inlet of the first drying zone.

[0047] In a preferred embodiment of the device, the heat exchange fluid circuit is a single heat exchange pipeline, which includes a pipe structure or an air duct structure.

[0048] In a preferred embodiment of the device, the gas outlet of the stable zone is connected to a tail gas treatment system, which includes a condensation recovery device or an absorption tower.

[0049] In a preferred embodiment of the device, the first drying zone, the second drying zone, and the stabilization zone are rigidly connected by flange connection, welding, or bolt connection.

[0050] In one embodiment, a schematic diagram of the overall structure of the drying device for the polymer electrolyte / membrane material is shown below. Figure 1 It mainly includes a frame 1, a conveying mechanism 5, a first drying zone 10, a second drying zone 19, a stabilization zone 25, a control system 30, and an exhaust gas treatment system 34.

[0051] The frame 1 provides a supporting framework for the entire device, and may be made of steel or aluminum alloy, among other things. Support legs 2, crossbeams 3, and connecting plates 4 are sequentially mounted on the frame 1 to ensure the stability and rigidity of the overall structure.

[0052] The conveying mechanism 5 employs a high-temperature resistant mesh belt or roller system, running through the first drying zone 10, the second drying zone 19, and the stabilization zone 25, to carry and transport the substrate coated with a wet film. The conveying mechanism 5 is sequentially equipped with a drive motor 6, a belt 7, rollers 8, and a support 9. The material flow direction adopts a counter-current design, meaning the material moves from the first drying zone 10 to the stabilization zone 25, while the heat flow direction is opposite, forming counter-current heat exchange and improving thermal efficiency.

[0053] The first drying zone 10 is a sealed chamber, see schematic diagram. Figure 2 The first drying zone 10 is rigidly connected to the second drying zone 19 via methods including but not limited to flange connections. The interior of the first drying zone 10 is sequentially equipped with: a solvent vapor inlet 11 for introducing reflux solvent gas; a concentration sensor 12 for real-time monitoring of the solvent gas concentration within the chamber; a gas pressure sensor 13 for real-time monitoring of the pressure within the chamber; and a temperature sensor 14 for real-time monitoring of the temperature within the chamber.

[0054] The first heating unit 15, employing a heating plate, infrared heater, or hot air circulation system, is located at the bottom of the cavity and is used for preliminary heating of the membrane material. The heat exchange pipeline outlet 16 is connected to a single heat exchange pipeline 29, and the heat is discharged through the air pump 17 and the heat exchanger 18. The first drying zone 10 is regulated by the control system 30 to maintain the internal pressure at a slightly negative pressure state of -0.01MPa to -0.03MPa to prevent the leakage of harmful gases.

[0055] The second drying zone 19 is a sealed chamber, rigidly connected to the first drying zone 10 and the stabilization zone 25 via methods including but not limited to flange connections. Inside the second drying zone 19 are sequentially installed: a vacuum system interface 20, connected to a vacuum pump 24, used to establish and maintain a negative pressure environment within the chamber; a second heating unit 21, located at the bottom of the chamber, providing the main drying heat energy; a return pipe 22, one end connected to the gas outlet of the second drying zone 19, and the other end connected to the solvent vapor inlet 11 of the first drying zone 10, used to return some solvent gas to the first drying zone 10; and a first heat exchange pipe inlet 23, connected to a single heat exchange pipe 29, receiving hot gas from the first drying zone 10. The second drying zone 19 is connected to the vacuum pump 24 via the vacuum system interface 20, maintaining the internal pressure at a negative pressure state of -0.05MPa to -0.09MPa.

[0056] The stabilization zone 25 is a sealed chamber rigidly connected to the second drying zone 19 via methods including but not limited to flange connections. Inside the stabilization zone 25, the following components are installed sequentially: a second heat exchange pipe inlet 26, connected to a single heat exchange pipe 29, receiving heat exchange gas from the second drying zone 19; a temperature gradient structure 27, employing a special flow channel or heat dissipation structure, positioned along the material conveying direction, causing the temperature of the incoming heat exchange gas to gradually decrease as it flows along the length of the chamber, forming a temperature field from high to low; and a gas outlet 28, located at the end of the stabilization zone 25, connected to the exhaust gas treatment system 34. The stabilization zone 25 is regulated by the control system 30 to maintain the internal pressure at a slightly negative pressure state of -0.005MPa to -0.015MPa.

[0057] The inlet of a single heat exchange pipe 29 is connected to the outlet 16 of the heat exchange pipe in the first drying zone 10. The main body of the pipe passes sequentially through the second drying zone 19 and the stabilization zone 25, forming heat exchange sections in both zones. The outlet of the pipe is connected to the inlet 26 of the second heat exchange pipe in the stabilization zone 25. A pump 17 and a heat exchanger 18 are installed on the single heat exchange pipe 29 to drive the flow of the heat exchange fluid and perform heat exchange.

[0058] The control system 30 integrates a PLC (Programmable Logic Controller) 31 and a touch screen 32. The signal acquisition unit 33 receives signals from all sensors, including the concentration sensor 12, gas pressure sensor 13, and temperature sensor 14, and transmits them to the PLC 31. The PLC 31 calculates based on preset process parameters and the real-time acquired signals, outputting control signals. These signals form electrical connections and closed-loop control with the sensors, the first heating unit 15, the second heating unit 21, the vacuum pump 24, the gas pump 17, and the heat exchange pipeline valves, thereby automatically and in real-time adjusting the power of each heating unit, the vacuum pump speed, and the heat exchange fluid flow rate.

[0059] The exhaust gas treatment system 34 is connected to the gas outlet 28 of the stabilization zone 25 and uses a condensation recovery device or absorption tower to recover or purify the final exhaust gas.

[0060] In one embodiment, the operation of the device mainly includes three paths, see [link to relevant documentation]. Figure 3 This includes: heat flow path, membrane material transport path, and solvent recovery path.

[0061] The hot air flow path is as follows: In the first drying zone 10, the hot air generated by the first heating unit 15 is transported to the heat exchanger 18 via a single heat exchange pipe 29 and a pump 17 for preliminary heat exchange, and then enters the first heat exchange pipe inlet 23 of the second drying zone 19. In the second drying zone 19, the hot airflow undergoes sufficient heat exchange with the membrane material, providing heat for deep drying. The cooled gas continues to be transported through the single heat exchange pipe 29 to the second heat exchange pipe inlet 26 of the stabilization zone 25. In the stabilization zone 25, the airflow flows along the temperature gradient structure 27, forming a temperature field from high to low, providing gradient cooling for the membrane material. Finally, the cooled exhaust gas is discharged from the gas outlet 28 to the tail gas treatment system 34 for solvent recovery or purification.

[0062] The membrane material transport path is as follows: the wet membrane substrate passes sequentially through the first drying zone 10, the second drying zone 19, and the stabilization zone 25 via the conveying mechanism 5. The membrane material travels in the opposite direction to the hot air flow, forming a counter-current heat exchange design, which significantly improves thermal energy utilization efficiency.

[0063] Specifically, the membrane material first enters the first drying zone 10. Within the first drying zone 10, reflux solvent gas introduced through the solvent vapor inlet 11 comes into contact with the membrane material, establishing a controllable solvent vapor atmosphere. Simultaneously, the first heating unit 15 gently heats the membrane material from the bottom. Under the combined effect of the controllable atmosphere and bottom heating, the solvent evaporation rate on the membrane surface is effectively suppressed, achieving gentle initial surface drying and avoiding defects such as skinning and embrittlement caused by excessively rapid drying of the membrane surface.

[0064] Next, the membrane material enters the second drying zone 19. Within the second drying zone 19, a vacuum pump 24 connected via a vacuum system interface 20 maintains a deep negative pressure environment of -0.05 MPa to -0.09 MPa, significantly reducing the solvent boiling point; simultaneously, the second heating unit 21 heats the membrane material from the bottom. Under the combined effect of deep negative pressure and heating, the deep solvent inside the membrane material is rapidly and efficiently removed, achieving deep drying.

[0065] Finally, the membrane material enters the stabilization zone 25. Within the stabilization zone 25, the heat exchange gas from the second drying zone 19 flows along the temperature gradient structure 27, forming a temperature field from high to low, allowing the membrane material temperature to gradually and uniformly drop to room temperature. The gradient cooling design effectively avoids internal stress caused by sudden temperature changes in the membrane material and prevents the cooled membrane material from absorbing moisture or solvent vapor from the environment, thus avoiding moisture reabsorption.

[0066] The solvent recovery path is as follows: a portion of the solvent-rich gas in the second drying zone 19 is returned to the solvent vapor inlet 11 of the first drying zone 10 via the reflux pipe 22 to establish and maintain a suitable solvent atmosphere in the first drying zone 10; the remaining gas flows into the stabilization zone 25 along the hot gas flow path, and finally enters the tail gas treatment system 34 through the gas outlet 28. The tail gas treatment system 34 recovers the solvent through condensation recovery or an absorption tower, which reduces solvent consumption and environmental pollution.

[0067] Throughout the entire operation, the control system 30 collects signals from sensors such as the concentration sensor 12, gas pressure sensor 13, and temperature sensor 14 in real time and compares them with preset process parameters. When any parameter deviates from the preset range, the PLC 31 automatically outputs adjustment signals: adjusting the power of the first heating unit 15 and the second heating unit 21 to control the temperature; adjusting the pumping speed of the vacuum pump 24 to control the pressure of the second drying zone 19; adjusting the speed of the air pump 17 or the opening of the heat exchange pipeline valves to control the flow rate of the heat exchange fluid; and adjusting the speed of the drive motor 6 to control the membrane material transfer speed. Through the above closed-loop control, the entire drying process is ensured to operate stably and accurately under optimal process conditions.

[0068] On the other hand, this disclosure also provides a drying method based on the aforementioned apparatus, comprising the following steps:

[0069] Step S100: The membrane material to be dried is continuously conveyed through a plurality of sequentially arranged and interconnected functional chambers, the plurality of functional chambers including a first drying zone, a second drying zone and a stabilization zone;

[0070] Step S200: During the conveying process, the heat exchange fluid flows sequentially through the first drying zone, the second drying zone, and the stabilization zone to achieve cascade utilization of heat;

[0071] Step S300: Establish and maintain a negative pressure environment in the first drying zone, the second drying zone and the stabilization zone, so that the membrane material sequentially goes through the first drying stage, the second drying stage and the stabilization stage.

[0072] Step S400: The gas discharged from the stable zone is transported to the exhaust gas treatment system for solvent recovery or purification.

[0073] To better understand this disclosure, the following more specific embodiments are provided to illustrate the technical effects of this disclosure.

[0074] The specific experimental method and sample parameters for this embodiment are as follows:

[0075] A polymer electrolyte membrane wet film produced in the same batch was selected as the experimental sample. Its thickness was 100 μm, its width was 1 m, and its initial solvent mass fraction was 60%. Drying was performed using the drying apparatus described in this disclosure. Key process parameters were set as follows: the conveyor speed was constant at 0.25 m / min; the temperature of the first drying zone was set at 80°C, and the chamber pressure was maintained at -0.01 MPa. Simultaneously, the solvent vapor partial pressure inside the chamber was adjusted and maintained at 0.008 MPa through the solvent vapor reflux pipeline to control the surface solvent evaporation rate; the temperature of the second drying zone was set at 60°C, and the chamber pressure was maintained at -0.025 MPa to significantly reduce the solvent boiling point and promote internal solvent removal; the stabilization zone formed a linear cooling gradient from 45°C to 25°C through a temperature gradient structure and maintained a slight negative pressure of -0.005 MPa. The device is started, and after the temperature, pressure and atmosphere parameters of each functional chamber reach the above-mentioned set values ​​and stabilize, the prepared wet film sample is sent in by the conveying mechanism, so that it passes through the first drying zone, the second drying zone and the stabilization zone in sequence to complete the entire drying and cooling process. The final product is collected at the outlet of the stabilization zone.

[0076] To objectively evaluate the technical effectiveness of the disclosed device, two conventional drying processes were set up as controls: conventional hot air drying: drying under normal pressure at 100°C and a wind speed of 2 m / s; conventional vacuum drying: drying under static negative pressure of -0.03 MPa and at 60°C. The comparative experiments used the same wet film samples as the above experiments, and the endpoint of all drying processes was determined by the stabilization of the film material mass change (i.e., a mass change rate of less than 0.1% / min).

[0077] Testing and characterization methods:

[0078] Drying time: For the apparatus described in this disclosure and conventional hot air drying processes, the drying time per unit area (min / m²) is... 2 The drying time is calculated based on the respective stable production cycle time (i.e., belt speed and effective drying width). For static vacuum drying, the drying time is directly measured through timing experiments and converted into the processing time per unit area.

[0079] Mechanical properties: The tensile strength (MPa) of the dried film was measured using a universal testing machine according to the national standard GB / T 1040.3-2006 "Determination of tensile properties of plastics" at a tensile speed of 10 mm / min.

[0080] Solvent residue rate: determined by gas chromatography (GC). The mass of the dried membrane material was accurately weighed, and after complete solvent extraction, the mass of residual solvent was calculated using a standard curve, and the percentage of residual solvent to the total mass of the membrane material was calculated.

[0081] Unit energy consumption: Record the total power consumption of the device during the entire drying cycle, divide it by the total mass of the oven-dried membrane material processed in that cycle, and obtain the energy consumption per unit mass of product (kWh / kg).

[0082] Figure 4 The comparison data chart of drying performance shows that, in terms of drying efficiency, this disclosure reduces the drying time to 4 min / m. 2 The drying process, compared to traditional methods, reduces drying time by approximately 40-70%, demonstrating the high efficiency of the three-zone continuous design. In terms of product quality, the tensile strength of the dried membrane reaches 30 MPa, and the solvent residue rate is as low as below 0.5%, confirming that a gentle and controllable drying process can effectively avoid material damage and achieve efficient removal of deep solvents. Furthermore, the unit energy consumption is reduced to 0.9 kWh / kg, indicating the effectiveness of the heat cascade utilization system.

[0083] In summary, this disclosure achieves tiered utilization of heat from the first drying zone to the second drying zone and the stable zone through a rigid three-zone connection and a single heat exchange pipeline, significantly reducing energy consumption. Furthermore, the device provided by this disclosure organically integrates atmosphere control, negative pressure drying, tiered heat exchange, and gradient cooling, featuring a compact structure, high degree of automation, and excellent drying quality, continuous production capacity, and system stability.

[0084] Although the embodiments of this disclosure have been described above in conjunction with the accompanying drawings, this disclosure is not limited to the specific embodiments and application fields described above. The specific embodiments described above are merely illustrative and instructive, and not restrictive. Those skilled in the art can make many other forms based on the teachings of this specification and without departing from the scope of protection of the claims of this disclosure, and all of these are within the scope of protection of this disclosure.

Claims

1. A drying apparatus for a polymer electrolyte / membrane material, characterized in that, include: The rack, and the following mounted on the rack: A conveying mechanism for continuously transporting membrane material to be dried; Multiple functional chambers are arranged sequentially and connected along the conveying direction of the membrane material. The multiple functional chambers include a first drying zone, a second drying zone, and a stabilization zone that are connected sequentially to form a channel through which the membrane material can pass continuously. The heat exchange fluid circuit has its inlet end connected to the gas outlet of the first drying zone and its outlet end connected to the gas inlet of the stable zone. It is used to transport the heat exchange fluid from the first drying zone to the second drying zone and the stable zone to achieve the cascade utilization of heat. The control system is connected to the conveying mechanism, the plurality of functional chambers and the heat exchange fluid circuit respectively.

2. The drying apparatus according to claim 1, characterized in that, The pressure in the first drying zone is maintained at a slightly negative pressure of -0.01MPa to -0.03MPa; the pressure in the second drying zone is maintained at -0.05MPa to -0.09MPa; and the pressure in the stable zone is maintained at a slightly negative pressure of -0.005MPa to -0.015MPa.

3. The apparatus according to claim 1, characterized in that, The first drying zone and the second drying zone are each independently equipped with a heating unit, which is located at the bottom of the corresponding functional chamber.

4. The apparatus according to claim 1, characterized in that, The first drying zone is equipped with a solvent vapor inlet.

5. The apparatus according to claim 1, characterized in that, A vacuum system is installed in the second drying zone.

6. The apparatus according to claim 1, characterized in that, A temperature gradient structure is provided along the conveying direction of the membrane material within the stable region.

7. The apparatus according to claim 1, characterized in that, The device also includes a return pipeline, the inlet of which is connected to the gas outlet of the second drying zone, and the outlet of which is connected to the gas inlet of the first drying zone.

8. The apparatus according to claim 1, characterized in that, The heat exchange fluid circuit is a single heat exchange pipeline, which includes a pipe structure or an air duct structure.

9. The apparatus according to claim 1, characterized in that, The gas outlet of the stable zone is connected to a tail gas treatment system, which includes a condensation recovery device or an absorption tower.

10. The apparatus according to claim 1, characterized in that, The first drying zone, the second drying zone, and the stabilization zone are rigidly connected by flanges, welding, or bolts.

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