Temperature and humidity control equipment and method for dry process section of hollow fiber membrane

Abstract

A temperature and humidity control device and method for a dry section of a hollow fiber membrane belong to the technical field of hollow fiber membrane manufacturing, temperature control step: heat is conducted by using a water bath and a copper coil pipe, an outer-layer thermal insulation material is adopted, continuous monitoring is performed by using a high-precision sensor, and the temperature is fed back to a constant-temperature water bath control system in real time, so that accurate control of the temperature in a dry section cover is realized; humidity control: water vapor in the dry range cover is increased or decreased by means of atomization humidification and an exhaust fan, a high-precision sensor is adopted to feed back to a humidifier and a wind power system, and rapid adjustment and long-term stability of humidity are achieved; the temperature and the humidity are independently controlled without interference, the air distribution step is optimized through the turbulence effect, and it is guaranteed that the temperature and the humidity in the dry range cover are evenly distributed. Stable and accurate temperature control is achieved through water bath temperature control, the humidity level is flexibly adjusted in cooperation with a humidity control system, and uniform distribution of the temperature and humidity in the dry range cover is ensured through efficient air distribution design.

Description

Technical Field

[0001] The invention belongs to the technical field of hollow fiber membrane production, and relates to a device and method for controlling temperature and humidity in a dry section of a hollow fiber membrane. Background Art

[0002] Hollow fiber membrane: Hollow fiber membrane is a self-supporting membrane with a fiber-like appearance and is usually made of polymer materials.

[0003] Lined hollow fiber membrane: It consists of an inner liner and a filter layer. The inner liner is usually made of polyester fibers woven from multiple strands to provide structural support, while the filter layer is the material coated on the surface of this inner liner.

[0004] Dry process: refers to the area from the spinneret to the coagulation bath during the membrane preparation process. In this area, temperature and humidity will affect the evaporation of the solvent in the membrane fiber and the structure and performance of the membrane fiber.

[0005] Phase inversion membrane preparation: This method involves the process of converting a sol or solution into a solid membrane. Immersion precipitation phase inversion membrane preparation is a typical phase inversion membrane preparation process, which immerses the solution containing the membrane material into a coagulant, so that the membrane material is precipitated in the coagulant to form a membrane.

[0006] Microfiltration membrane: The pore size is generally between 0.1 and 10 microns, and it can intercept suspended matter, bacteria, high molecular weight colloids and other substances.

[0007] Ultrafiltration membrane: usually between 0.002 and 0.1 microns, capable of retaining proteins, microorganisms, and macromolecular organic matter.

[0008] The dry section in the hollow fiber spinning process refers to the air passage from the spinneret to the air passage before entering the coagulation bath. During this stage, the hollow fiber membrane is not fully formed. The changing environmental atmosphere at this time has an important impact on the formation and performance of the fiber, which increases production costs, wastes resources, and reduces production efficiency. At present, the problems existing in the dry section in the hollow fiber spinning process are mainly concentrated in the following aspects:

[0009] (1) Temperature control: The temperature of the environment affects the spinnability of the casting solution and the formation of microporous membranes. During the drying process, if the temperature is high, the activity of water increases, which helps the evaporation of the solvent, thereby forming a thin and dense outer skin layer through the gel process. The increase in drying temperature will cause the shrinkage of larger pores and smaller pores in the membrane to occur simultaneously. The small pores are easy to shrink or even disappear, the number of membrane pores is significantly reduced, and the larger pores shrink to a limited extent. By controlling the drying conditions, a certain degree of pre-shrinkage of the membrane pores can be achieved. Therefore, the temperature control of the drying process has a significant effect on the structure and properties of the fiber. In addition, temperature changes will affect the mechanical properties, chemical stability, air permeability and separation performance of the membrane filaments. Specifically, temperature increases usually lead to thermal expansion of the membrane material, which may cause changes in the size of the membrane filaments, thereby affecting the filtration efficiency and mechanical strength of the membrane. Temperature changes in the drying process may also affect the molecular motion of the membrane material, thereby changing the pore structure and separation characteristics of the membrane. In addition, higher drying process temperatures usually lead to faster cooling rates, which help to form smaller micropore sizes and higher porosity. Lower temperatures may lead to slower cooling rates, which is conducive to the formation of larger spherulites, thereby increasing the membrane pore size. The temperature of the dry process has a significant impact on the morphology, structure, and pore size of the membrane filaments, and the control of this factor is crucial.

[0010] (2) Humidity control: Humidity control in the dry process has a significant effect on the structure and properties of the fiber. Improper humidity control may lead to uneven fiber surface or structural defects, affecting the quality of the final product. Specifically, changes in humidity will affect the solvent evaporation rate of the membrane filaments, thereby affecting the porosity and mechanical properties of the membrane filaments. In addition, humidity control also interacts with other spinning conditions (such as temperature, pressure and spinning speed) to jointly determine the microstructure and macroscopic properties of the membrane filaments. Ambient humidity also has a great influence on the spinning process. Too high humidity may cause the fiber to absorb moisture and expand, affecting its dimensional stability and mechanical properties, and has a great influence on the spinnability of hollow fiber membranes.

[0011] (3) Uneven distribution of temperature and humidity: I. Uneven membrane filament structure: If the temperature and humidity distribution in the drying process are uneven, the drying rate of the membrane filament surface may be inconsistent, thus affecting the uniformity of the membrane filament and the microstructure of the final membrane. Uneven drying may form an uneven skin layer on the surface of the membrane filament, which will affect the separation performance and mechanical strength of the membrane. II. Porosity and pore size distribution: Uneven distribution of temperature and humidity may lead to incomplete evaporation of the solvent inside the membrane filament, affecting the porosity and pore size distribution of the membrane. This will directly affect the permeability and retention efficiency of the membrane. II. Mechanical properties of the membrane: Improper control of temperature and humidity in the drying process may lead to uneven stress inside the membrane filament, thereby affecting the tensile strength and elongation at break of the membrane. This is crucial for the long-term stability and durability of the membrane. IV. Chemical stability of the membrane: Uneven drying conditions may lead to uneven chemical composition on the surface and inside of the membrane filament, affecting the chemical stability and anti-fouling ability of the membrane.

[0012] The uncontrollability of temperature and humidity in the dry process is indeed a major challenge in the preparation of hollow fiber membranes. This not only affects the stability of the membrane's appearance structure and performance, but also limits the adjustable range of the process. Especially when faced with extreme process parameters such as low temperature and high humidity, high temperature and low humidity, traditional preparation methods are often difficult to meet the needs.

[0013] The dry process control technology of hollow fiber membrane in the preparation process refers to the precise control of environmental humidity and temperature during the drying stage of membrane filaments from the spinneret outlet to the coagulation bath. The purpose is to optimize the production process of hollow fiber membranes and improve the quality and performance of membranes. By precisely controlling the temperature and humidity of the dry process section, the solvent evaporation rate of the membrane filaments can be improved, thereby affecting the porosity and mechanical properties of the membrane filaments. Such a control structure helps to improve the porous structure formed on the membrane surface and the looseness of the cross-sectional structure, thereby obtaining hollow membrane filaments with high pore size and high flux. In addition, precise control of the environmental conditions of the dry process section also helps to reduce the unevenness or structural defects on the membrane filament surface and ensure the filtration efficiency and mechanical strength of the membrane. The design of this control structure is intended to solve the complex problems of the need to adjust the formula and coagulation bath in the prior art, and at the same time use advanced technologies such as water bath temperature control system, humidity control system, air distribution system, and automatic adjustment of temperature and humidity monitoring feedback system to improve the defects of insufficient temperature and humidity control in the dry process section.

[0014] The role of the hollow fiber membrane dry process control technology in improving the porosity of the membrane filament is mainly reflected in the optimization of the solvent evaporation rate by precisely controlling the temperature and humidity of the dry process, thereby promoting the formation and development of the internal space of the membrane filament. This control technology helps to achieve a more uniform membrane wall thickness and a more regular pore structure, thereby improving the porosity of the membrane filament. Specifically, appropriate humidity conditions can prevent the membrane filament from drying out prematurely and maintain sufficient plasticity, so that the internal space can be better formed and expanded during the spinning process. At the same time, temperature control helps to regulate the volatilization rate of the solvent and avoid rapid drying due to excessively high temperatures, which may hinder the formation of internal space. Through these fine controls, membrane filaments with higher porosity can be obtained, which is very beneficial for improving the filtration efficiency and mechanical strength of the membrane.

[0015] In the actual production process, the application of this control technology can be achieved by using advanced temperature and humidity control equipment, which can monitor and adjust the environmental conditions of the dry process in real time to ensure the stability and repeatability of the spinning process. In this way, the overall quality of the hollow fiber membrane can be greatly improved to meet the application requirements of high-performance filtration materials.

[0016] The coating implementation scheme that is most similar to the present invention is "A Hollow Membrane Spinning Dry Process Humidity Control Structure and Its Application" (Application Publication Number: CN 117646288 A) published by Sanda Membrane Technology (Xiamen) Co., Ltd. on December 20, 2023. A hollow membrane spinning dry process humidity control structure and its application are disclosed, including a cavity and several groups of capacitive sensing atomizers arranged therein, but there is no clear means of ambient temperature control, and the humidity control mainly relies on several groups of capacitive sensing atomizers, there is an uneven distribution, and there is a risk that the sprayed atomized liquid will directly contact the hollow membrane filaments. On the other hand, humidification can only be achieved through atomization, and dehumidification of the dry process section cannot be achieved.

[0017] The existing dry process used in the hollow fiber membrane preparation process lacks control or is not accurately controlled, and has the following disadvantages:

[0018] 1. No temperature control or inaccurate temperature control: At present, most of the dry sections of hollow fibers used in water treatment and other industries have no control methods. In actual production, with long-term operation, the appearance structure and performance of the membrane are affected by environmental factors in the dry section, and there are large changes. Equipment with temperature control usually uses electric heating for temperature control, but there is often a deviation between the actual temperature and the set temperature. This deviation may be caused by a variety of factors, including sensor failure, controller failure, or heating element failure. In addition, the electric heating method also has a temperature pulse phenomenon, that is, the temperature fluctuates above and below the set value, and stable and accurate temperature control cannot be achieved.

[0019] 2. Inaccurate humidity control: Existing equipment can only humidify according to demand, but the humidity distribution is not uniform, and there are local humidity that is too high or too low, which may have an adverse effect on product quality. For high-temperature gel tanks, the humidification effect is often minimal, and the humidity cannot be reduced in the dry process hood 1, which makes it particularly difficult to control a low-humidity environment under high temperature conditions. Similarly, in low-temperature gel tanks, the humidification effect is only weak due to the humidification effect of the gel tank, and heating humidification destroys the temperature constant system.

[0020] 3. No air distribution system: The existing equipment lacks an air distribution system, which results in the temperature and humidity of the dry section not being evenly distributed. Without an air distribution system, the temperature and humidity control of the dry section will be limited, and accurate temperature and humidity control cannot be achieved, which may affect product quality uniformity and production efficiency. At the same time, the lack of an air distribution system also means that the humidity of the dry section cannot be effectively reduced, which may have an adverse effect on the production process that requires a low humidity environment. In addition, proper air exchange in a high humidity environment can also effectively avoid the condensation of water droplets and the increase in the solubility of air solvents on the performance structure of the membrane fibers. Summary of the invention

[0021] The present invention aims at solving the problems in the prior art and provides a device and method for controlling the temperature and humidity of a hollow fiber membrane dry section.

[0022] A temperature and humidity control device for the dry section of a hollow fiber membrane, wherein an air distribution duct is connected around a dry section hood cavity, an exhaust fan is connected to one side of the top of the dry section hood cavity, another exhaust fan is connected to the other side of the top of the dry section hood cavity, a spinneret is placed at the center of the dry section hood cavity, an outer thermal insulation hood wraps the dry section hood, an atomizing humidifying device is connected to both sides of the dry section hood cavity, a core liquid port is connected to the spinneret, one end of a multi-pipe copper coil is connected to a water outlet of a constant temperature water bath, the other end of the multi-pipe copper coil is connected to a water inlet of a constant temperature water bath, the water outlet of the constant temperature water bath and the water inlet of the constant temperature water bath are respectively connected to the dry section hood cavity, the port extends out of the dry section hood cavity, and a temperature sensor and a humidity sensor are connected to the top of the dry section hood.

[0023] A method for controlling temperature and humidity in a dry section of a hollow fiber membrane comprises a temperature control step, a humidity control step and an air distribution step.

[0024] The temperature control step uses a water bath and copper coil to conduct heat, an outer layer of insulation material, and continuous monitoring with high-precision sensors, which instantly feed back to the constant temperature water bath control system to achieve precise control of the temperature inside the drying hood.

[0025] The humidity control step uses atomizing humidification and exhaust fans to increase or decrease the water vapor in the dryer hood, and uses high-precision sensors to feed back to the humidifier and wind system to achieve rapid humidity adjustment and long-term stability; the temperature and humidity are independently controlled without interfering with each other.

[0026] The air distribution step is optimized through turbulence effect to ensure uniform distribution of temperature and humidity inside the drying hood.

[0027] A method for controlling temperature and humidity in the dry process of a hollow fiber membrane is designed for higher precision and stability of hollow fiber membrane preparation technology, and mainly includes three core technologies: temperature control, humidity control, and air distribution system. Among them, temperature control uses a water bath and copper coil to conduct heat, and an outer layer of thermal insulation material, supplemented by high-precision sensors for continuous monitoring, and immediate feedback to the constant temperature water bath control system to achieve precise control of the temperature in the dry process hood 1; at the same time, humidity control uses atomization humidification and exhaust fans to increase or decrease the water vapor in the dry process hood 1, and uses high-precision sensors to feedback to the humidifier and wind system to achieve rapid humidity adjustment and long-term stability; temperature and humidity are independently controlled without interfering with each other, which is conducive to experimental exploration and extreme process parameter conditions.

[0028] In addition, by optimizing the turbulence effect, the uniform distribution of temperature and humidity in the drying hood 1 is effectively guaranteed, and the overall structure of the hollow membrane structure is complete and uniform, which is conducive to multi-filament production.

[0029] The advantages of the present invention are: sponge pore structure and relatively uniform pore size, which paves the way for the refined production of hollow fiber membranes. By adjusting the temperature and humidity, the curing rate and mode of the membrane material can be controlled, thereby forming a uniform and stable sponge pore structure, and enhancing the permeability and selectivity of the membrane. The sponge pore structure of the hollow fiber membrane is the key to its high separation performance and durability. The uniformity of the pore size directly affects the separation efficiency and stability of the hollow fiber membrane. Through the precise control of temperature and humidity, it is possible to ensure that the environmental conditions during the membrane curing process are consistent, thereby promoting the uniform distribution of pore size. This not only improves the filtration performance of the membrane, but also enhances the long-term use stability of the membrane, and avoids the decrease in separation efficiency and shortening of membrane life caused by uneven pore size. Under the precise control of temperature and humidity, through the effective adjustment of relevant parameters, the structure and performance of the hollow fiber membrane can be finely regulated, and the formation of the sponge pore structure and the uniformity of the pore size are realized, which provides a strong technical support for the high-quality and high-efficiency production of the hollow fiber membrane.

[0030] Precise temperature and humidity control can optimize the microenvironment during the membrane curing process and promote the formation of pore structure. Through the precise control of the present invention, relevant parameters can be effectively adjusted, and the limit conditions can be controlled, thereby achieving fine control of the membrane structure to achieve the desired sponge pore structure and relatively uniform pore size, which opens the way for the refined production of hollow fiber membranes.

[0031] Compared with the traditional dry section temperature and humidity control method, the innovative design of the present invention has significant advantages in many aspects:

[0032] 1. Accurate and rapid temperature and humidity control: The present invention realizes precise control of the temperature and humidity in the drying hood 1 through an integrated water bath temperature control system, a humidification system, and a carefully designed air distribution system. Compared with traditional methods, the present invention can respond to temperature and humidity changes more quickly, ensuring that the environmental conditions in a small space quickly reach and maintain the set values, significantly improving the long-term stability and efficiency of the production process.

[0033] 2. Uniform temperature and humidity distribution: The air distribution system, water bath temperature control system and humidification system of the present invention are reasonably distributed, and under their joint action, they can effectively promote the uniform distribution of temperature and humidity in the drying hood 1. This not only avoids the problem of local overheating or overhumidity, ensures the stability of the performance of the hollow fiber membrane, but also provides more uniform and controllable environmental conditions for other production processes that require temperature and humidity control.

[0034] 3. Wide applicability: Although the dry process cover 1 of the present invention is originally designed for the production of hollow fiber membranes, its excellent temperature and humidity control capabilities make it widely applicable. Whether it is biopharmaceuticals, food processing, electronic manufacturing or other industries with strict requirements on environmental conditions, the present invention can provide stable, uniform and accurate temperature and humidity control to meet diverse production needs.

[0035] The present invention adopts water bath temperature control to achieve temperature stability and precise control, and is matched with a humidity control system to flexibly adjust the humidity level, supplemented by an efficient air distribution design to ensure uniform distribution of temperature and humidity inside the dry process hood 1; the present invention accurately adjusts and controls the temperature and humidity of the dry process section, optimizes and improves the membrane making process, gives the hollow fiber membrane structure a high degree of adjustability and controllability, and realizes the adjustment of the thickness and structure of the outer layer.

[0036] In summary, the present invention has shown significant advantages over traditional methods in terms of accuracy, response speed and distribution uniformity of temperature and humidity control. It not only provides an ideal environment for the production of hollow fiber membranes, but also opens up new possibilities for other production fields that require temperature and humidity control, reflecting its wide potential and innovative value in industrial applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. As shown in the figure:

[0038] Figure 1 , schematic diagram of hollow fiber dry process temperature and humidity control equipment.

[0039] Figure 2 , temperature and humidity control to adjust the thickness of the surface layer and the indoor environment atmosphere state diagram.

[0040] Figure 3 , temperature and humidity control to adjust the thickness of the outer surface layer. Control temperature and humidity status diagram.

[0041] Figure 4 , high temperature and high humidity structure diagram of the temperature and humidity control optimized section.

[0042] Figure 5 , temperature and humidity control optimization section's control temperature and humidity structure diagram.

[0043] Figure 6 , temperature and humidity control to increase the state of the outer surface without openings.

[0044] Figure 7 , temperature and humidity control and increase the outer surface opening status diagram.

[0045] Figure 8 , temperature and humidity control to optimize the air environment status of pore size distribution.

[0046] Fig. 9 , temperature and humidity control to optimize the pore size distribution in the narrow pore size distribution state diagram.

[0047] Fig.10 , a flow chart of the control method steps of the present invention.

[0048] Fig.11 , Schematic diagram of the locations of SE2 detector and Inl ens detector.

[0049] Air distribution duct, outer thermal insulation cover 2, spinneret 3, water bath temperature control outlet 4, exhaust fan 5, humidification atomization device 6, temperature sensor and humidity sensor 7, core liquid outlet 8, water bath temperature control circulation copper conduit 9, water bath temperature control water inlet 10. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] Example 1: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 and Fig.10 As shown, a temperature and humidity control device and method for the dry section of a hollow fiber membrane.

[0052] A method for controlling the temperature and humidity of the dry section of a hollow fiber membrane is provided. This method has important application value for many industrial processes requiring precise environmental control, such as the manufacture of biomedical membranes. The method is described in detail as follows:

[0053] (1) Temperature control: The temperature control of the dry section mainly relies on the external circulation water heating unit. This unit can provide stable heat and keep the temperature of the dry section within the set range through precise temperature regulation. The advantage of this method is that it can achieve high-precision temperature control, thereby ensuring the stability and consistency of product quality.

[0054] (2) Humidity control: Humidity control is mainly achieved in two ways. First, the volatilization of moisture in the gel tank can increase the humidity of the dry process. Second, the humidity of the dry process can be further increased by adding humidification equipment. In addition, the wind speed can be adjusted by the air distribution system to cooperate with humidity control to increase or decrease the humidity. The advantage of this method is that it can achieve high-precision humidity control, thereby ensuring the stability and consistency of product quality.

[0055] (3) Air distribution system: The size and direction of wind force have a significant impact on the temperature and humidity distribution of the dry section. By adjusting the wind force through the air distribution system, the temperature and humidity distribution of the dry section can be changed. The turbulence formed by the small air volume of the air distribution duct can effectively achieve a uniform distribution of temperature and humidity, thereby achieving more precise environmental control.

[0056] like Fig.10 As shown, a method for controlling temperature and humidity in the dry section of a hollow fiber membrane comprises the following steps: the air distribution pipe of the air distribution system causes turbulence of air so as to be evenly distributed in the dry section cover 1.

[0057] Humidity control steps: increase humidity or reduce humidity, increase humidity through the atomizing humidifier 6, reduce humidity through the exhaust fan 5, the humidity of the dry process hood 1 is detected by the humidity sensor 7, the humidity sensor 7 increases the atomizing power to the atomizing humidifier 6 according to the humidity, and the humidity sensor 7 increases the wind force to the exhaust fan 5 according to the humidity, so as to control and adjust the humidity of the dry process hood 1.

[0058] Temperature control steps: adjust through the constant temperature unit, the constant temperature unit is connected to the constant temperature water bath water inlet 10, the constant temperature water bath water inlet 10 is connected to the multi-pipe copper coil 9, the multi-pipe copper coil 9 is used to heat or cool the air, the multi-pipe copper coil 9 is connected to the constant temperature water bath outlet 4, the temperature of the dry process hood 1 is sensed by the temperature sensor 7 to the constant temperature unit, and the temperature output of the constant temperature unit is adjusted according to the temperature difference feedback from the temperature sensor 7.

[0059] A method for controlling temperature and humidity in the dry section of a hollow fiber membrane, Figure 2-Figure 9 The effect of temperature and humidity control is shown.

[0060] Figure 2 Explanation: 20μm is the ruler, and the unit length is 20 microns; Acceleration voltage (EHT) = 2 kV. Generally, the higher the acceleration voltage, the higher the image resolution. When the sample has good conductivity and is not easily damaged by the electron beam, a high acceleration voltage can be selected; but if the acceleration voltage is too high, the electron beam has too much penetration into the sample, the sample surface information is missing, and the sample looks like jade. Only by flexibly selecting the acceleration voltage according to your own requirements can you get an ideal electron microscope image. Working distance (WD) = 4.9 mm, which is the distance from the pole shoe under the objective lens to the sample surface.

[0061] S i gna l A = InLens, signal source, annular secondary electron detector (Inl ens detector) installed in the objective lens, located in the electron beam light path, operating at a small working distance (WD < 5mm) or low accelerating voltage, SE1 is accelerated by the electrostatic lens installed at the bottom of the objective lens, straight up from the inner hole of the objective lens pole shoe, and converged to the detector surface, and SE2 and other electrons are repelled. It only receives secondary electrons from the incident area of ​​the electron beam, so the resolution is high and the image quality is good. Magnification (Mag) = 600 times, Date: 1Feb 2024; Date: February 1, 2024, Time: 16:23:36; Time: 16:23:36.

[0062] Figure 3 Explanation: 10μm is the ruler, the unit length is 10 microns; acceleration voltage (EHT) = 2 kV, working distance (WD) = 5 mm, which is the distance from the pole shoe under the objective lens to the sample surface. Signa lA = InLens, the annular secondary electron detector (Inl ens detector) installed in the objective lens, magnification (Mag) = 650 times, Date: 1Feb 2024; Date: February 1, 2024, Time: 16:24:25; Time: 16:24:25.

[0063] Figure 4Explanation: 20μm is the ruler, the unit length is 20 microns; acceleration voltage (EHT) = 2 kV, working distance (WD) = 4.6 mm, which is the distance from the pole shoe under the objective lens to the sample surface. Sign A = SE 2. The SE2 detector is usually mounted on the side of the sample chamber. In addition to receiving secondary electrons, it also receives transmitted electrons and some backscattered electrons. Magnification (Mag) = 518 times, Date: 27Mar2024; Date: May 27, 2024, Time: 16:20:39; Time: 16:20:39.

[0064] Figure 5 Explanation: 10μm is the ruler, the unit length is 10 microns; acceleration voltage (EHT) = 2 kV, working distance (WD) = 5 mm, which is the distance from the pole shoe under the objective lens to the sample surface. Signa lA = InLens, the annular secondary electron detector (Inl ens detector) installed in the objective lens, magnification (Mag) = 650 times, Date: 1Feb 2024; Date: February 1, 2024, Time: 16:24:25; Time: 16:24:25.

[0065] Figure 6 Explanation: 500nm is the ruler, the unit length is 500 nanometers; acceleration voltage (EHT) = 2 kV, working distance (WD) = 4.9 mm, which is the distance from the pole shoe under the objective lens to the sample surface. Signa lA = SE 2, the SE2 detector is often mounted on the side of the sample chamber, in addition to receiving secondary electrons, it also receives transmitted electrons and some backscattered electrons. Magnification (Mag) = 20,000 times, Date: 8Sep 2023; Date: September 8, 2023, Time: 17:26:53; Time: 17:26:53.

[0066] Figure 7 Explanation: 500nm is the ruler, the unit length is 500 nanometers; acceleration voltage (EHT) = 2 kV, working distance (WD) = 5.1 mm, which is the distance from the pole shoe under the objective lens to the sample surface. Sign A = SE 2, the SE2 detector is often mounted on the side of the sample chamber, in addition to receiving secondary electrons, it also receives transmitted electrons and some backscattered electrons. Magnification (Mag) = 20,000 times, Date: 18Sep2023; Date: September 18, 2023, Time: 16:55:58; Time: 16:55:58.

[0067] Figure 8 Explanation: Horizontal axis: Diameter microns, unit: microns; Vertical axis: PORE SIZE DISTRIBUTION, pore size distribution.

[0068] Fig. 9 Explanation: Horizontal axis: Diameter microns, unit: microns; Vertical axis: PORE SIZE DISTRIBUTION, pore size distribution.

[0069] right Figure 2-Figure 9 Explanation, such as Fig.11 As shown in the figure, in the high vacuum tube, the electron beam generated by the electron gun is focused into a thin beam by the electron convergence lens, and then scans and bombards the sample surface point by point, generating a series of electronic information (secondary electrons, back-reflected electrons, transmitted electrons, absorbed electrons, etc.). The detector receives various electronic signals, amplifies them by the electronic amplifier, and then inputs them into the cathode ray tube controlled by the cathode ray tube grid. The SE2 detector is often installed on the side of the sample chamber. In addition to receiving secondary electrons, it also receives transmitted electrons and some backscattered electrons. The annular secondary electron detector (Inl ens detector) installed in the objective lens is located in the electron beam optical path. When operating at a small working distance (WD<5mm) or low acceleration voltage, SE1 is accelerated by the electrostatic lens installed at the bottom of the objective lens, goes straight up from the inner hole of the objective lens pole shoe, and converges to the detector surface. SE2 and other electrons are repelled. It only receives secondary electrons from the incident area of ​​the electron beam, so the resolution is high and the image quality is good, but the three-dimensional sense is poor. The role of the objective lens: to make the final focus of the electron beam, reduce the electron beam again and focus it on the uneven sample surface. The function of the scanning coil is to deflect the electron beam and make regular sweeps on the sample surface. The function of the pole shoe is to reduce electron energy loss and contamination of the electron optical path and increase the life of the filament.

[0070] Example 2: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 and Fig.11 As shown, a temperature and humidity control device and method for the dry section of a hollow fiber membrane.

[0071] The structure of a temperature and humidity control device for the dry section of a hollow fiber membrane:

[0072] 1. In view of the inaccurate temperature control of electric heating: The present invention proposes to use an external circulation water heating unit as an alternative to solve the temperature control problem of electric heating. The external circulation water heating unit can provide more stable and accurate temperature control. Its working principle is to control the temperature inside the equipment through an external circulating water system. This system can avoid the temperature pulse problem of electric heating and provide a more uniform and stable temperature, thereby improving the accuracy of the production process and product quality.

[0073] 2. Humidity control in the drying section: The present invention proposes to use effective humidification means and air distribution system to solve the problem of inaccurate humidity control in the drying section. Humidification means can increase the humidity in the drying section, while the air distribution system can ensure that the temperature and humidity are evenly distributed in the drying section, avoiding production problems caused by uneven humidity distribution.

[0074] 3. For uneven temperature and humidity distribution: The air distribution system can effectively control the temperature and humidity of the dry process section by evenly distributing the wind force with a small air volume, thus improving the stability of the production process and product quality. In addition, the air distribution system can also reduce the humidity of the dry process section, which is especially important for production processes that require a low humidity environment. Due to the existence of the temperature and humidity control system and the air distribution system, extreme dry process environments such as high temperature and low humidity, low temperature and high humidity can be tested.

[0075] 1. Technical solution for temperature and humidity control in the dry process:

[0076] From the outlet of the spinning plate liquid to the liquid level of the gel tank, they are all in the closed small space of the dry process cover 1.

[0077] (1) Temperature control: In terms of temperature control in the drying hood 1, an efficient and accurate water bath temperature control system is adopted. Compared with electric heating, it avoids rapid temperature rise, and the temperature control is more stable, more accurate, safer, and easier to maintain. The specific working principle is as follows:

[0078] Water bath circulation temperature control: A water bath circulation system is used to control the temperature inside the dry process hood 1. The water bath system heats water to a predetermined temperature through an external heating device, and then sends the hot water into the dry process hood 1 through a circulation pump. The hot water transfers heat through the copper conduit in the dry process hood 1, so that the temperature inside the dry process hood 1 reaches a predetermined temperature. The advantage of this temperature control method is that water has a large heat capacity and can provide a stable heat source, thereby ensuring the temperature inside the dry process hood 1 is stable. For environments requiring sub-zero temperatures, this can be achieved by replacing the heat transfer medium.

[0079] Copper pipe heat transfer: The copper pipe has good thermal conductivity, which can quickly and evenly transfer the heat of hot water to the air in the dryer hood 1, so that the temperature in the dryer hood 1 quickly reaches the predetermined temperature. At the same time, the copper pipe also has good thermal stability, and can maintain good thermal conductivity in a high temperature environment for a long time, thereby ensuring the temperature stability in the dryer hood 1. The multi-way coil design means that heat can be transferred through multiple paths, which makes the heat distribution in the dryer hood 1 more even. At the same time, the multi-way coil design increases the contact area between the copper pipe and the air in the dryer hood 1, improves the heat exchange efficiency, thereby improving thermal efficiency and saving energy. The layout is clearer, maintenance and inspection are more convenient, and maintenance costs are reduced.

[0080] Temperature sensor feedback: The drying hood 1 is equipped with a temperature sensor, which can monitor the temperature inside the drying hood 1 in real time and feed back the temperature data to the control system. When the temperature inside the drying hood 1 is lower than or higher than the preset temperature, the control system will automatically adjust the heating power of the water bath to ensure that the temperature inside the drying hood 1 is stable.

[0081] Manual adjustment: Although the control system can automatically adjust the heating power of the water bath, it may be necessary to manually adjust the temperature of the water bath according to production requirements or special circumstances. Through the control panel, the operator can manually adjust the temperature of the water bath according to the feedback data of the temperature sensor to ensure that the drying hood 1 can reach the expected temperature in a short time.

[0082] In summary, through water bath circulation temperature control, copper conduit heat transfer, temperature sensor feedback and manual adjustment, the temperature inside the drying hood 1 can be accurately controlled to ensure the temperature inside the drying hood 1 is stable, thereby improving the stability of the production process and product quality.

[0083] (2) Humidity control: The invention adopts a comprehensive and intelligent control strategy for humidity control in the drying hood 1, as follows:

[0084] Gel tank volatilization controls humidity: Since the hollow fiber spinning gel tank generally has a certain temperature, the water will naturally volatilize to form a certain humidity environment. At this time, by adjusting the exhaust volume of the condensation fan, the basic humidity level in the dry process hood 1 can be controlled. When the volatilization of the gel tank causes excessive humidity, causing the humidity in the dry process hood 1 to exceed the set range, the exhaust fan will start to reduce the humidity in the dry process hood 1 by exhausting air to reach the set humidity level. The use of the exhaust fan can quickly and effectively reduce the humidity and prevent excessive humidity from having adverse effects on the production process.

[0085] Humidifier assists in increasing humidity: When the evaporation of the gel tank does not meet the set humidity requirement, the humidifier will automatically start and increase the humidity in the drying hood 1 by spraying to reach the set humidity level. The use of a humidifier can quickly and effectively increase humidity to meet production needs.

[0086] Humidity sensor feedback control: The dry process hood 1 is equipped with a humidity sensor, which can monitor the humidity in the dry process hood 1 in real time and feed back the humidity data to the control system. The control system will automatically adjust the spray volume of the humidifier and the exhaust volume of the exhaust fan according to the feedback data of the humidity sensor to maintain a stable humidity environment in the dry process hood 1, thereby improving the stability of the production process and product quality.

[0087] (3) Air distribution system: By adopting a hollow air distribution duct and using a small amount of turbulent air to stir the environment inside the drying hood 1, the uniform distribution of temperature and humidity in the drying hood 1 is achieved, the stability of the production process and the product quality are improved, and it is an efficient and practical air distribution system design.

[0088] Air distribution duct design: The air distribution duct adopts a hollow design, which can ensure that the air can flow out evenly from all parts of the air distribution duct, forming turbulent air with a small air volume. This turbulent air can effectively stir the environment inside the dry process hood 1, making the temperature and humidity distribution more uniform.

[0089] Air distribution duct position: The air distribution duct is not only located between the water bath heating circulation copper tube and the humidifier, but this position design allows the heated and humidified air to first pass through the air distribution duct and be evenly blown to the surroundings. The air distribution duct is also distributed in other surroundings to blow the conditioned air to specific parts. This design can avoid local overheating or overhumidification, and ensure that the temperature and humidity distribution in the dry process hood 1 is more uniform.

[0090] When faced with low humidity process requirements, the air distribution system can adjust its air volume output, increase the air flow rate, and thus enhance the air exchange efficiency. With the operation of the exhaust fan, the high humidity air in the dry process hood 1 is quickly exhausted, and more dry air is introduced, thereby quickly reducing the humidity level in the dry process hood 1 to achieve the low humidity environment required by the process. Improve production efficiency and product quality: The air distribution system can improve the stability of the production process and product quality by achieving uniform distribution of temperature and humidity in the dry process hood 1, while also improving production efficiency.

[0091] Example 3: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 and Fig.11 As shown, a temperature and humidity control device and method for the dry section of a hollow fiber membrane.

[0092] Temperature and humidity control to adjust the thickness of the outer layer:

[0093] like Figure 1 As shown, a temperature and humidity control device for the dry section of a hollow fiber membrane includes: a temperature control system (a thermostat, a water bath circulation copper conduit), a humidity control system (a humidifier, an exhaust fan), an air distribution system, a temperature and humidity detection feedback system (a temperature and humidity sensor), and other devices. Figure 1As shown, a drying hood 1, an air distribution duct, an outer heat-insulating hood 2, a spinneret 3, a constant temperature water bath outlet 4, an exhaust fan 5, an atomizing humidifying device 6, a temperature sensor and a humidity sensor 7, a core liquid outlet 8, a multi-pipe copper coil 9, and a constant temperature water bath inlet 10.

[0094] like Figure 1 As shown, the air distribution duct is connected to the four sides of the dry process hood 1 cavity, the exhaust fan 5 is connected to one side of the top of the dry process hood 1 cavity, and another exhaust fan 5 is connected to the other side of the top of the dry process hood 1 cavity. The spinneret 3 is placed in the center of the dry process hood 1 cavity, the outer thermal insulation cover 2 wraps the dry process hood 1, the atomizing humidifying device 6 is connected to both sides of the dry process hood 1 cavity, the core liquid port 8 is connected to the spinneret 3, one end of the multi-channel copper coil 9 is connected to the constant temperature water bath outlet 4, and the other end of the multi-channel copper coil 9 is connected to the constant temperature water bath inlet 10, the constant temperature water bath outlet 4 and the constant temperature water bath inlet 10 are respectively connected to the dry process hood 1 cavity, and the ports extend out of the dry process hood 1 cavity, and the temperature sensor and the humidity sensor 7 are connected to the top of the dry process hood 1.

[0095] Temperature control: constant temperature water bath water inlet 10, multi-pipe copper coil 9, constant temperature water bath outlet 4, temperature sensor and humidity sensor 7. The temperature sensor and humidity sensor can be an integrated structure or a split structure, and are respectively connected to the dry process cover 1.

[0096] Humidity control: air duct, exhaust fan 5, atomizing humidifying device 6, temperature sensor and humidity sensor 7.

[0097] Others: outer thermal insulation cover 2, spinneret 3, core liquid port 8.

[0098] The air distribution duct is located around the dry process hood 1, and the air distribution duct is located between the multi-pipe copper coil 9 and the temperature sensor and the humidity sensor 7, forming turbulence to promote uniform distribution of temperature and humidity. The outer insulation cover 2 is located outside the dry process hood 1 to keep warm, and the spinneret 3 is located in the center of the dry process hood 1.

[0099] The bottom of the dry process cover 1 is close to the liquid level of the gel tank, so that the liquid level and the dry process cover 1 form a closed small space to achieve temperature and humidity control in the dry process section. The spinneret is located in the center of the dry process cover 1. The height of the dry process cover 1 can be adjusted up and down according to the process requirements. Of course, it can be more than one spinneret, but can also be multiple.

[0100] First, the small volume turbulent gas in the air distribution duct is always open to stir the air and water vapor in the hood so that the temperature and humidity in the hood are evenly distributed.

[0101] A plurality of atomizing and humidifying devices 6 are evenly distributed on both sides of the dry process cover 1. After starting, the humidity reaches 100% within 5 minutes, and the atomizing effect is guaranteed, and the atomizing effect will not be directly sprayed onto the membrane wire.

[0102] Through the humidity sensor, the gear of the exhaust fan and humidifier is adjusted to control the humidity to the set value. At the same time, the thermostat circulates the heat transfer medium (water or heat transfer oil, etc.) through the water inlet in the copper conduit and then discharges the water. The temperature in the dry process cover 1 reaches the set temperature within 10 minutes. The more the temperature deviates from the ambient temperature, the longer the time required. The heat dissipation is controlled by the outer insulation cover to maintain the set temperature. The spinning experiment is carried out after the temperature and humidity are constant for 10 minutes.

[0103] Specifically, the temperature of the drying hood 1 is set to 15° C., the humidity is set to 60%, and the drying height is set to 30 cm.

[0104] Preparation of casting solution: DMAC, PVP-K12, K30, and PES were mixed evenly at a mass ratio of 25:5:5:65, and the casting solution was prepared after degassing, and the spinning experiment was carried out with water as the coagulation liquid. The casting solution and the core liquid entered the hollow membrane spinning dry process control structure through the hollow spinneret channel, and the dry process height was maintained at 30 cm, the humidity was adjusted to 60%, and the temperature was 15°C, and then entered the gel bath for coagulation, and the cross section of the membrane was a finger-like hole structure.

[0105] The thickness of the outer layer of the hollow fiber membrane has a significant effect on its key performance indicators such as permeation flux, retention rate, mechanical strength and durability. The experimental results show that the reduction of the outer layer thickness can significantly increase the permeation flux of the membrane. This phenomenon can be attributed to the thinner outer layer reducing the resistance of the substance through the membrane, thereby accelerating the permeation process. However, the reduction in the thickness of the outer layer has a relatively small effect on the retention rate, which indicates that within a certain range, the retention performance is mainly determined by the pore size distribution and structure of the membrane, rather than relying solely on the thickness of the outer layer. In addition, it is worth noting that the reduction in the thickness of the outer layer can also unexpectedly improve the mechanical strength and durability of the membrane. This may be because the thinner outer layer reduces the stress concentration inside the membrane to a certain extent, thereby enhancing the overall structural stability of the membrane, making it show better durability in long-term use.

[0106] The present invention opens up a new path for adjusting the thickness of the outer layer of the hollow fiber membrane by precisely controlling the temperature and humidity. Under the same formula liquid core liquid formula system, fine-tuning of temperature and humidity can finely affect the membrane formation process, thereby achieving effective regulation of the thickness of the outer layer of the hollow fiber membrane.

[0107] In the traditional preparation process of hollow fiber membranes, high temperature gel tanks are usually accompanied by high humidity environments, which to a certain extent limits the optimization of membrane performance. Although high temperature can accelerate the gelation process of the membrane and promote the formation of the membrane structure, the high humidity environment often causes the outer surface layer of the membrane to be too thick, thereby affecting the key properties of the membrane such as permeability and mechanical strength. However, the independent regulation of temperature and humidity in the present invention provides an innovative solution for improving the performance of hollow fiber membranes, making it possible to reduce humidity in a high temperature environment, thereby effectively controlling the formation process of the outer surface layer of the membrane.

[0108] The present invention has brought revolutionary changes to the preparation process of hollow fiber membranes, which not only optimizes membrane performance, but also broadens its application scope in water treatment, biopharmaceuticals, food industry, etc. For example, in the field of water treatment, by reducing the thickness of the outer surface of the membrane, higher water flux can be achieved, filtration efficiency can be improved, and energy consumption can be reduced; in the biopharmaceutical industry, the optimized mechanical strength and durability can ensure that the membrane remains stable during the complex biological fluid treatment process, and improve the purity and yield of the product.

[0109] Example 4: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 and Fig.11 As shown, a temperature and humidity control device and method for the dry section of a hollow fiber membrane.

[0110] Temperature and humidity control to optimize cross-section structure:

[0111] The sponge pore structure has a higher porosity and lower flow resistance, which makes the material perform better in applications such as liquid absorption and gas permeation. The pores of the sponge pore structure are interconnected to form a three-dimensional network similar to a sponge. This structure helps to improve the mechanical strength and pressure resistance of the material. Therefore, by increasing the temperature of the gel tank, the sponge pore structure shown in the figure below can be obtained. Subsequently, the dry process cover 1 is added to set the temperature to 70°C and the humidity to 90%, which can achieve the transition from finger-like pores to sponge pores, and the overall structure is complete and uniform.

[0112] When preparing hollow fiber membranes under high temperature and high humidity, the local temperature and humidity inhomogeneity often become the key factors affecting the integrity and performance of the membrane structure. This inhomogeneity may cause the membrane to form non-ideal structures during the curing process, such as finger-like pores or vesicle structures, rather than the desired sponge pore structure. These non-ideal structures will not only reduce the permeability of the membrane, but also may affect the retention efficiency of the membrane, resulting in a decrease in the production quality of the membrane.

[0113] The present invention effectively solves the problem of uneven local temperature and humidity under high temperature and high humidity environment by precisely controlling temperature and humidity, thereby ensuring that the hollow fiber membrane forms an ideal sponge pore structure during the curing process. The sponge pore structure is characterized by uniform pore size distribution and high porosity, which can effectively intercept molecules of a specific size, which is not only conducive to improving the permeation flux of the membrane, but also can achieve refined interception of substances, ensuring that the membrane has good separation performance. The hollow fiber membrane with a uniform sponge pore structure has high structural stability, can maintain stable performance during long-term operation, reduce the risk of membrane damage and blockage, and extend the service life of the membrane. The precise control of temperature and humidity achieved by the present invention, the stable membrane structure and the excellent performance indicators can not only meet the high requirements of different application scenarios, but also reduce the unqualified rate in the production process, improve production efficiency, and reduce production costs, providing a solid guarantee for the competitiveness of membrane products in the market.

[0114] Example 5: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 and Fig.11 As shown, a temperature and humidity control device and method for the dry section of a hollow fiber membrane.

[0115] In the preparation process of hollow fiber membrane, low temperature gel tank is usually accompanied by low humidity environment, which poses a challenge to the performance improvement of membrane. Although low temperature helps to control the curing speed of membrane and ensure the formation of membrane structure, low humidity environment often leads to the failure of membrane surface pores to fully open, thus affecting the key performance of membrane such as permeability and selectivity. Under low temperature conditions, the proper increase of humidity through the humidification system can promote the full opening of membrane surface pores, and increase the humidity in the dry process cover 1 from 20% to 70%. This is because moderate humidity can provide enough moisture to keep the membrane material in a certain plasticity during the curing process, which is conducive to the formation and expansion of membrane pores. Through the humidity regulation technology of the present invention, a humidity condition that is more conducive to the formation of membrane pores can be created under low temperature environment, ensuring the full opening of membrane surface pores, reducing the resistance of substances passing through the membrane, thereby significantly improving the permeability of the membrane and increasing the flux of the membrane. By precisely controlling the humidity, the size and distribution of the membrane pores can be adjusted, the selectivity of the membrane can be optimized, the interception efficiency of specific substances can be improved, and a more refined separation effect can be achieved.

[0116] Example 6: Figure 1 , Figure 2 , Figure 3 , Figure 4, Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 and Fig.11 As shown, a temperature and humidity control device and method for the dry section of a hollow fiber membrane.

[0117] Temperature and humidity control to optimize pore size distribution:

[0118] The present invention achieves significant optimization of the pore size distribution of the hollow fiber membrane by precisely controlling the temperature and humidity of the dry section. This breakthrough is of great significance for improving the accuracy and efficiency of membrane separation technology. In the dry section, that is, the key stage of membrane curing and pore formation, slight changes in temperature and humidity will have a profound impact on the microstructure of the membrane. In the traditional preparation process, due to the lack of precise control of temperature and humidity, the membrane pore size distribution is often wide and the pore sizes are different, which limits the application of the membrane in the field of high-precision separation. Through the precise control of the temperature and humidity of the dry section, the distribution range of the membrane pore size can be effectively narrowed and the pore size can be uniformed. Specifically, suitable humidity can promote the uniform expansion of the membrane material during the curing process, and precise temperature control ensures the stable conditions for the formation of membrane pores. Under the combined effect, the membrane pore size can be evenly distributed within a narrow range, greatly improving the separation accuracy of the membrane. The hollow fiber membrane with uniform pore size has a more stable and reliable separation performance, which can achieve high-precision interception of specific molecules or particles while allowing other substances to pass freely. This feature has great application potential for industries that require extremely high filtration accuracy, such as pharmaceuticals, biotechnology, fine chemicals, food processing, and water treatment. For example, in the pharmaceutical industry, high-precision membrane separation technology can be used to purify active ingredients and improve the purity and yield of drugs; in the field of water treatment, membranes with uniform pore size can effectively remove microorganisms and pollutants in water to ensure water quality safety.

[0119] The key point of the present invention is its device structure, which is specially used for the temperature and humidity control of the drying hood 1, which shows that the invention is optimized for a specific application scenario. The creativity includes the function of accurately raising and lowering the temperature and humidity that the device can achieve, which means that the invention has high-precision environmental control capabilities and can meet the requirements of processes or storage that are sensitive to temperature and humidity. The realization of these functions may involve advanced sensor technology, intelligent control systems, and precise actuator design to ensure that environmental parameters can operate stably within the set range and can be quickly adjusted as needed.

[0120] The working principle of the temperature and humidity control equipment of the dry process hood 1 mainly relies on high-precision sensors, intelligent controllers, and efficient refrigeration, dehumidification, and humidification and heating systems. These devices usually use PID (proportional-integral-differential) control algorithms to achieve fast response and precise adjustment to ensure temperature stability. Humidity control is more complicated and needs to consider the impact of temperature on humidity at the same time. The system's built-in humidity sensor continuously monitors the indoor humidity level and compares it with the set value. When the humidity is too high, the dehumidification mechanism is activated to reduce the moisture content in the air through condensation dehumidification or adsorption dehumidification; conversely, if the humidity is too low, the humidification system is activated to increase the indoor humidity using steam humidification or ultrasonic humidification technology. These control strategies ensure accurate and efficient humidity regulation.

[0121] In addition, these devices also have self-diagnosis and protection functions, which can promptly detect and handle potential faults, such as refrigerant leakage, filter blockage, etc., to ensure long-term stable operation of the system. At the same time, they support remote monitoring and operation, and users can view indoor environmental parameters at any time through the Internet, adjust set values, and realize intelligent management.

[0122] Temperature control: Electric heating is used for temperature control; other liquids can be used as the water bath circulation medium to achieve a lower or higher dry process temperature;

[0123] Humidity regulation: Use humidifiers and dehumidifiers.

[0124] Example 7: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 and Fig.11 As shown, a method for controlling the temperature and humidity of a hollow fiber membrane dry section comprises the following steps:

[0125] At the beginning of the operation, the target temperature and humidity parameters are first preset according to the process requirements. Then, the air distribution system is automatically activated to form turbulence (the airflow is small and does not affect the membrane filaments). The air regulated by the copper coil is fully mixed with the moderately humidified gas released by the humidifier and evenly diffused to the entire internal space of the dry process hood 1, which promotes the randomness of the gas flow, accelerates the balanced distribution of temperature and humidity, and makes the temperature and humidity in the hood tend to be uniform.

[0126] The temperature sensor detects that the actual temperature inside the dry process hood 1 deviates from the preset target value, and the constant temperature water bath system responds immediately. According to the deviation direction, it intelligently turns on heating or cooling to adjust the temperature of the circulating water. Thanks to the excellent heat conduction characteristics of the copper conduit coil, the adjusted temperature can be quickly and effectively transmitted to the inside of the dry process hood 1. This dynamic balance mechanism relies on the continuous monitoring and instant feedback of the sensor to ensure that the temperature inside the hood always closely meets the established standards and maintains an ideal constant state.

[0127] During operation, if the humidity sensor indicates that the relative humidity in the dry process hood 1 is lower than the expected set value, the atomizing humidification device 6 will immediately increase the working intensity, accelerate the evaporation rate of water, and effectively increase the humidity level in the hood. On the contrary, when the sensor indicates that the actual humidity exceeds the target value, the humidifier will reduce the water vapor production in time, inhibit the accumulation of additional humidity, and restore the environment in the hood to an ideal state.

[0128] In the face of abnormally high humidity, even if the mist humidification device 6 is in shutdown state, if the humidity sensor still reports a value exceeding the set value, the exhaust fan will be automatically activated. At this time, according to the specific difference in target humidity, the system intelligently adjusts the exhaust volume to quickly extract excess humid air from the dry process hood 1 until the humidity in the hood returns to the set range.

[0129] By adjusting the temperature and humidity of the dry section respectively, the thickness of the outer layer of the hollow fiber membrane can be controlled to control the membrane selectivity and durability; the outer structure can be adjusted, the membrane surface texture can be optimized, the anti-pollution ability and chemical stability can be enhanced; the cross-sectional structure can be optimized to improve the permeation efficiency and separation efficiency; the pore size distribution uniformity can be improved, etc., to achieve high-precision separation of the membrane.

[0130] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling temperature and humidity in the dry section of a hollow fiber membrane, characterized in that: Including temperature control step, humidity control step, and air distribution step, The temperature control step uses a water bath and copper coil to conduct heat, and the outer layer of insulation material is supplemented by high-precision sensors for continuous monitoring, which instantly feeds back to the constant temperature water bath control system to achieve precise control of the temperature inside the dry process hood. The humidity control step uses atomizing humidification and exhaust fans to increase or decrease the water vapor in the dryer hood, and uses high-precision sensors to feed back to the humidifier and wind system to achieve rapid humidity adjustment and long-term stability; the temperature and humidity are independently controlled without interfering with each other. The air distribution step is optimized through turbulence effect to ensure uniform distribution of temperature and humidity inside the drying hood.

2. A method for controlling temperature and humidity in the dry section of a hollow fiber membrane according to claim 1, characterized in that: Temperature control steps: The temperature control of the dry section mainly depends on the external circulation water heating unit. The unit provides stable heat and keeps the temperature of the dry section within the set range through precise temperature regulation. Humidity control steps: It can be achieved in two ways. The moisture in the gel tank evaporates to increase the humidity of the dry section. The humidity of the dry section can be further increased by adding humidification equipment. The wind force can be adjusted by the air distribution system, and the humidity can be increased or decreased in conjunction with humidity control. Air distribution steps: The wind force is adjusted through the air distribution system to change the temperature and humidity distribution of the drying section. The turbulence formed by the small air volume of the air distribution duct can effectively achieve a uniform distribution of temperature and humidity, and realize more precise environmental control.

3. A method for controlling temperature and humidity in the dry section of a hollow fiber membrane according to claim 1, characterized in that: The temperature control step includes a water bath circulation temperature control step: a water bath circulation system is used to control the temperature in the drying hood. The water bath system heats water to a predetermined temperature through an external heating device, and then sends the hot water into the drying hood through a circulation pump. The hot water transfers heat through the copper conduit in the drying hood, so that the temperature in the drying hood reaches the predetermined temperature. The temperature control step includes a copper conduit heat transfer step: the copper conduit has good thermal conductivity, and can quickly and evenly transfer the heat of hot water to the air in the dry process hood, so that the temperature in the dry process hood quickly reaches a predetermined temperature. The copper conduit also has good thermal stability, and can maintain good thermal conductivity in a high temperature environment for a long time, thereby ensuring the temperature stability in the dry process hood. The heat can be transferred through multiple paths through the multi-way coil, which makes the heat distribution in the dry process hood more uniform. The multi-way coil design increases the contact area between the copper conduit and the air in the dry process hood, thereby improving the heat exchange efficiency. The process includes a temperature sensor feedback step: a temperature sensor is installed in the drying hood to monitor the temperature in the drying hood in real time and feed back the temperature data to the control system. When the temperature in the drying hood is lower than or higher than the preset temperature, the control system will automatically adjust the heating power of the water bath to ensure the temperature in the drying hood is stable. The process includes manual adjustment steps: manually adjusting the temperature of the water bath according to production requirements or special circumstances; through the control panel, the operator manually adjusts the temperature of the water bath according to feedback data from the temperature sensor to ensure that the expected temperature in the drying hood can be reached in a short time.

4. A method for controlling temperature and humidity in the dry section of a hollow fiber membrane according to claim 1, characterized in that: The humidity control step includes a gel tank volatilization humidity control step: when the gel tank volatilizes and causes the humidity to be too high, causing the humidity in the dry process hood to exceed the set range, the exhaust fan will start to reduce the humidity in the dry process hood by exhausting air to reach the set humidity level. Contains a humidifier to assist in increasing humidity: When the evaporation of the gel tank does not meet the set humidity requirement, the humidifier will automatically start to increase the humidity in the dry process hood by spraying to reach the set humidity level. Contains humidity sensor feedback control steps: a humidity sensor is installed in the dry process hood to monitor the humidity in the dry process hood in real time and feed back the humidity data to the control system. The control system automatically adjusts the spray volume of the humidifier and the exhaust volume of the exhaust fan according to the feedback data of the humidity sensor to maintain a stable humidity environment in the dry process hood.

5. A method for controlling temperature and humidity in the dry section of a hollow fiber membrane according to claim 1, characterized in that: The air distribution step uses a hollow air distribution pipe to stir the environment inside the drying hood with a small amount of turbulent air, thereby achieving uniform distribution of temperature and humidity inside the drying hood. The air distribution duct adopts a hollow structure, which can ensure that the air can flow out evenly from all parts of the air distribution duct, forming a small amount of turbulent air. This turbulent air can effectively stir the environment inside the dryer hood, making the temperature and humidity distribution more uniform. Air distribution duct position: The air distribution duct is located between the water bath heating circulation copper tube, i.e., the multi-channel copper coil, and the atomizing humidification device. This position design allows the heated air and the humidified air to first pass through the air distribution duct and be evenly blown to the surroundings. The air distribution duct is distributed around the dry process hood and can blow the conditioned air to specific parts. When faced with low-humidity process requirements, the air distribution system adjusts its air volume output, increases the air flow rate, and thus enhances the air exchange efficiency. With the operation of the exhaust fan, the high-humidity air in the dry process hood is quickly discharged, and at the same time more dry air is introduced to quickly reduce the humidity level in the dry process hood and achieve a low-humidity environment.

6. A temperature and humidity control device for the dry section of a hollow fiber membrane, characterized in that: The air distribution duct is connected to the four sides of the dry process hood cavity, the exhaust fan is connected to one side of the top of the dry process hood cavity, and another exhaust fan is connected to the other side of the top of the dry process hood cavity. The spinneret is placed in the center of the dry process hood cavity, the outer insulation cover wraps the dry process hood, the atomization humidification device is connected to both sides of the dry process hood cavity, the core liquid port is connected to the spinneret, one end of the multi-pipe copper coil is connected to the outlet of the constant temperature water bath, the other end of the multi-pipe copper coil is connected to the inlet of the constant temperature water bath, the outlet of the constant temperature water bath and the inlet of the constant temperature water bath are respectively connected to the dry process hood cavity, the port extends out of the dry process hood cavity, and the temperature sensor and the humidity sensor are connected to the top of the dry process hood.

7. A hollow fiber membrane dry section temperature and humidity control device according to claim 6, characterized in that: The air distribution duct is located between the multi-pipe copper coil and the temperature sensor and humidity sensor.

8. The temperature and humidity control device for the dry section of a hollow fiber membrane according to claim 7, characterized in that: The air distribution duct adopts a hollow structure.

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