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

Abstract

A temperature and humidity control device for a dry process section of a hollow fiber membrane belongs to the technical field of hollow fiber membrane manufacturing, an air distribution pipe is connected to the periphery in a dry process cover cavity, an exhaust fan is connected to one side of the top in the dry process cover cavity, and the other exhaust fan is connected to the other side of the top in the dry process cover cavity. The spinneret plate is placed in the center in a cavity of the dry-range cover, the dry-range cover is wrapped by the outer-layer heat preservation cover, the atomization humidification device is connected to the two sides in the cavity of the dry-range cover, the core liquid opening is connected with the spinneret plate, one end of the multi-pipeline copper coil pipe is connected with a water outlet of the constant-temperature water bath, and the other end of the multi-pipeline copper coil pipe is connected with a water inlet of the constant-temperature water bath. And the constant-temperature water bath water outlet and the constant-temperature water bath water inlet are respectively connected with the dry range cover cavity. 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 even distribution of the temperature and humidity in the dry range cover is guaranteed through efficient air distribution design.

Description

Technical Field

[0001] The utility model belongs to the technical field of hollow fiber membrane production, and relates to a temperature and humidity control device for 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 fiber woven from multiple strands to provide structural support, while the filter layer is the material coated on the surface of this inner liner.

[0004] Drying process: refers to the area between the spinneret and the coagulation bath during membrane preparation. In this area, the temperature and humidity affect the evaporation of the solvent in the membrane filaments and the structure and properties of the membrane filaments.

[0005] Phase inversion membrane formation: This method involves converting a sol or solution into a solid membrane. Immersion precipitation is a typical phase inversion membrane formation process, where a solution containing the membrane material is immersed in a coagulant, causing the membrane material to precipitate 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, large molecular weight colloids and other substances.

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

[0008] The dry section in the hollow fiber spinning process refers to the air passage from the extrusion of 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 a significant impact on the formation and performance of the fiber, which increases production costs, wastes resources, and reduces production efficiency. Currently, the problems existing in the dry section in the hollow fiber spinning process mainly focus on the following aspects:

[0009] (1) Temperature control: The temperature of the environment will affect 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 proceed 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 the size of the membrane filaments to change, 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 result in slower cooling rates, favoring the formation of larger spherulites, which may increase 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, making control of this factor crucial.

[0010] (2) Humidity control: Humidity control in the dry process has a significant impact 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 filament, thereby affecting the porosity and mechanical properties of the membrane filament. 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 filament. 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 the hollow fiber membrane.

[0011] (3) Uneven temperature / humidity distribution: 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, thereby affecting the uniformity of the membrane filament and the microstructure of the final membrane. Uneven drying may form an uneven cortex on the membrane filament surface, which will affect the separation performance and mechanical strength of the membrane. II. Porosity and pore size distribution: Uneven temperature and humidity distribution 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 temperature and humidity control 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, or high temperature and low humidity, traditional preparation methods are often difficult to meet the requirements.

[0013] Dry-stage control technology in the hollow fiber membrane manufacturing process involves precise control of the ambient humidity and temperature during the drying phase of the membrane filaments from the spinneret outlet to the coagulation bath. This technology aims to optimize the hollow fiber membrane production process and improve membrane quality and performance. Precise control of the temperature and humidity during the dry-stage process improves the solvent evaporation rate of the membrane filaments, thereby affecting the membrane filament's porosity and mechanical properties. This control structure helps enhance the porous structure formed on the membrane surface and increase the looseness of the cross-sectional structure, thereby producing hollow membrane filaments with high pore size and high flux. Furthermore, precise control of the environmental conditions during the dry-stage process helps minimize surface unevenness or structural defects on the membrane filaments, ensuring the membrane's filtration efficiency and mechanical strength. This control structure is designed to address the complexities of the existing technology, which require adjustments to the formulation and coagulation bath. It also utilizes advanced technologies such as a water bath temperature control system, a humidity control system, an air distribution system, and automatic adjustment of the temperature and humidity monitoring feedback system to address the inadequate temperature and humidity control during the dry-stage process.

[0014] The role of hollow fiber membrane dry process control technology in improving the porosity of membrane filaments is mainly reflected in the optimization of the evaporation rate of the solvent by precisely controlling the temperature and humidity of the dry process, thereby promoting the formation and development of the internal space of the membrane filaments. 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 filaments. Specifically, appropriate humidity conditions can prevent the membrane filaments 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 adjustments, 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 actual production, this control technology can be implemented through the use of advanced temperature and humidity control equipment. These devices can monitor and adjust the environmental conditions of the drying 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 most similar coating implementation scheme to the present invention is the "A Hollow Membrane Spinning Dry Process Humidity Control Structure and Its Application" (Application Publication No.: CN117646288 A) published by Sanda Membrane Technology (Xiamen) Co., Ltd. on December 20, 2023. Disclosed is a hollow membrane spinning dry process humidity control structure and its application, including a through cavity and several groups of capacitive sensing atomizers arranged therein, but there is no clear means of controlling the ambient temperature, and the humidity control mainly relies on several groups of capacitive sensing atomizers, which are unevenly distributed and accompanied by the risk that the sprayed atomized liquid will directly contact the hollow membrane filaments. On the other hand, it can only humidify by atomization, and cannot dehumidify the dry process.

[0017] The existing methods used in the preparation of hollow fiber membranes lack control or have inaccurate control during the dry process, and have the following disadvantages:

[0018] 1. No or inaccurate temperature control: Currently, the dry-end section of hollow fiber membranes used in industries like water treatment is largely unregulated. In actual production, over time, the membrane's appearance, structure, and performance are significantly affected by environmental factors in the dry-end section. Temperature-controlled equipment typically uses electric heating, but the actual temperature often deviates from the set point. This deviation can be caused by a variety of factors, including sensor failure, controller failure, or heating element failure. Furthermore, electric heating can experience temperature pulsation, where the temperature fluctuates around the set point, making stable, precise temperature control impossible.

[0019] 2. Inaccurate humidity control: Existing equipment can only humidify according to demand, but the humidity distribution is uneven, and there may be localized areas where the humidity is too high or too low, which may have a negative impact on product quality. For high-temperature gel tanks, the humidification effect is often minimal, and the humidity cannot be reduced within the dry process hood 1, making it particularly difficult to control a low-humidity environment under high-temperature conditions. Similarly, in low-temperature gel tanks, the humidification effect is weak due to the humidification effect of the gel tank alone, and heating and humidification destroy the temperature constant system.

[0020] 3. Lack of an air distribution system: Existing equipment lacks an air distribution system, which results in uneven temperature and humidity distribution in the dry section. Without an air distribution system, temperature and humidity control in the dry section is limited, making precise temperature and humidity control impossible, potentially impacting product quality uniformity and production efficiency. Furthermore, the lack of an air distribution system also means that humidity in the dry section cannot be effectively reduced, which can negatively impact production processes that require a low-humidity environment. Furthermore, proper air exchange in high-humidity environments can effectively prevent condensation and the increased solubility of airborne solvents, which can affect membrane fiber performance and structure. Summary of the Invention

[0021] The utility model aims to solve the problems in the prior art and provides a device for controlling temperature and humidity in the dry section of a hollow fiber membrane.

[0022] A temperature and humidity control device for the dry section of a hollow fiber membrane, wherein air distribution ducts are connected on all sides of the 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 in the center of the dry section hood cavity, an outer thermal insulation cover wraps the dry section hood, an atomizing and humidifying device is connected on 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 the water outlet of a constant temperature water bath, the other end of the multi-pipe copper coil is connected to the water inlet of a constant temperature water bath, the water outlet and the water inlet of a constant temperature water bath are respectively connected to the dry section hood cavity, the ports extend 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 provide instant feedback 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 drying hood, and adopts high-precision sensors to feedback to the humidifier and wind system to achieve rapid adjustment and long-term stability of humidity; temperature and humidity are independently controlled without interfering with each other.

[0026] The air distribution step is optimized by the turbulent effect to ensure the uniform distribution of temperature and humidity in the dry run cover.

[0027] A hollow fiber membrane dry run section temperature and humidity control method is designed for higher precision and stability of hollow fiber membrane preparation technology, mainly including three core technologies of temperature control, humidity control and air distribution system. Among them, the temperature control uses water bath and copper coil conduction heat, outer insulation material, supplemented by high-precision sensor continuous monitoring, instant feedback to the constant temperature water bath control system, realizes the accurate control of the temperature in the dry run cover 1; at the same time, the humidity control increases and decreases the water vapor in the dry run cover 1 by means of atomizing humidification and exhaust fan, and adopts high-precision sensor feedback to the humidifier and the wind system, so as to achieve rapid adjustment and long-term stability of humidity; the temperature and humidity are independently controlled and do not interfere with each other, which is beneficial to experimental research and extreme process parameter conditions.

[0028] In addition, by optimizing the turbulent effect, the temperature and humidity in the dry run cover 1 are effectively ensured to be uniformly distributed, the overall structure of the hollow membrane structure is realized to be complete and uniform, and the multi-wire production is facilitated.

[0029] The advantages of the utility model are: the sponge hole structure and the relatively uniform pore size open up a road for the fine production of hollow fiber membranes. By adjusting the temperature and humidity, the solidification rate and mode of the membrane material can be controlled, so that a uniform and stable sponge hole structure is formed, and the permeability and selectivity of the membrane are enhanced. The sponge hole 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 accurate control of temperature and humidity, the environmental conditions during membrane solidification can be ensured to be 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, avoiding the decrease of separation efficiency and shortening of membrane life caused by uneven pore size. Under the accurate control of temperature and humidity, through effective adjustment of related parameters, the structure and performance of the hollow fiber membrane can be finely controlled, the formation of the sponge hole structure and the uniformity of the pore size are realized, and strong technical support is provided for the high-quality and high-efficiency production of the hollow fiber membrane.

[0030] Accurate temperature and humidity control can optimize the microenvironment during membrane solidification and promote the formation of pore structure. Through the accurate control of the utility model, related parameters can be effectively adjusted, extreme conditions can be controlled, and fine regulation of the membrane structure can be realized to achieve the desired sponge hole structure and relatively uniform pore size, which opens up a road for the fine production of hollow fiber membranes.

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

[0032] 1. Precise and rapid temperature and humidity control: The utility model discloses through the water bath temperature control system of integration, humidification system and the air distribution system of careful design, realized the accurate control to the temperature and humidity in dry journey cover 1. Compared with traditional means, the utility model discloses can respond to temperature and humidity change more quickly, ensure the environmental condition in small space reaches and maintains at the set value rapidly, improve the long time stability and efficiency of production process significantly.

[0033] 2. Uniform temperature and humidity distribution: The air distribution system of the utility model and water bath temperature control system, humidification system are distributed reasonably, under the joint action, can effectively promote the uniform distribution of temperature and humidity in dry journey cover 1. This not only avoids the problem of local overheating or overwetting, ensures the stability of hollow fiber membrane performance, 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 journey cover 1 of the utility model is initially designed for the production of hollow fiber membranes, its excellent temperature and humidity control capability makes it have wide applicability. Whether it is biopharmaceuticals, food processing, electronics manufacturing or other industries with strict requirements on environmental conditions, the utility model can provide stable, uniform and precise temperature and humidity control to meet diverse production needs.

[0035] The utility model adopts water bath temperature control to realize stable and accurate temperature control, and cooperates with humidity control system to flexibly adjust humidity level, and is assisted by efficient air distribution design to ensure uniform distribution of temperature and humidity inside dry journey cover 1. The utility model precisely adjusts and controls the temperature and humidity of dry journey section, optimizes and perfects the membrane production process, gives the hollow fiber membrane structure high adjustability and controllability, and realizes the adjustment of outer layer thickness and structure.

[0036] In summary, the utility model has significant advantages over traditional methods in terms of accuracy, response speed and 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, demonstrating its broad potential and innovative value in industrial applications. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor. As shown in the figure:

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

[0039] Figure 2 , temperature and humidity control to adjust the thickness of the outer surface layer.

[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 optimization section.

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

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

[0044] Figure 7 , temperature and humidity control add external surface opening status diagram.

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

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

[0047] Figure 10 , a flow chart of the control method steps of the present utility model.

[0048] Figure 11 , SE2 detector and Inl ens detector location diagram.

[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 port 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 embodiments described 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 making creative efforts 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 、 Figure 9 and Figure 10 As shown, a temperature and humidity control device 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 described. This method has important application value in many industrial processes requiring precise environmental control, such as the manufacture of biopharmaceutical membranes.

[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 maintain 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 achieved primarily through two methods. First, the volatilization of moisture in the gel tank can increase the humidity of the drying section. Second, the humidity of the drying section can be further increased by adding humidification equipment. In addition, by adjusting the wind speed through the air distribution system, the humidity can be increased or decreased in conjunction with humidity control. 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 wind force and direction have a significant impact on the temperature and humidity distribution of the drying section. By adjusting the wind force through the air distribution system, the temperature and humidity distribution of the drying 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 Figure 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 turbulent air to be evenly distributed in the dry section cover 1.

[0057] Humidity control steps: increase or decrease humidity, increase humidity through the atomizing humidifying device 6, and reduce humidity through the exhaust fan 5. The humidity of the drying hood 1 is measured by the humidity sensor 7. The humidity sensor 7 increases the atomizing power to the atomizing humidifying device 6 according to the humidity, and the humidity sensor 7 increases the wind speed to the exhaust fan 5 according to the humidity, so as to achieve the control and regulation of the humidity of the drying 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 cover 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 is provided. Figure 2-Figure 9 The effect of temperature and humidity control is shown.

[0060] Figure 2 Explanation: 20μm is the ruler, with a unit length of 20 microns; Accelerating Voltage (EHT) = 2 kilovolts. Generally, higher accelerating voltages yield higher image resolution. High accelerating voltages are recommended for samples with good conductivity and less susceptible to electron beam damage. However, excessively high accelerating voltages can lead to excessive electron beam penetration, resulting in a loss of surface information and a jade-like appearance. Flexibly selecting the accelerating voltage based on your specific needs will yield ideal electron microscope images. Working Distance (WD) = 4.9 mm, the distance from the lower pole piece of the objective lens to the sample surface.

[0061] Signal A = InLens, signal source. The annular secondary electron detector (Inlens detector) mounted within the objective lens is located in the electron beam path. Operating at a small working distance (WD < 5 mm) or low accelerating voltage, electrons SE1 are accelerated by an electrostatic lens mounted below the objective lens, passing directly upward from the inner aperture of the objective lens pole piece and converging onto the detector surface. Electrons SE2 and other electrons are repelled. The detector receives only secondary electrons from the electron beam incident region, resulting in high resolution and excellent image quality. Magnification (Mag) = 600x, Date: 1 February 2024, Time: 16:23:36.

[0062] Figure 3 Explanation: 10 μm is the ruler, with a unit length of 10 microns; accelerating voltage (EHT) = 2 kilovolts, working distance (WD) = 5 mm, the distance from the objective lens lower pole piece to the sample surface. Signa lA = InLens, the annular secondary electron detector (Inl ens detector) installed in the objective lens, magnification (Mag) = 650x, Date: 1 February 2024, Time: 16:24:25.

[0063] Figure 4Explanation: 20μm is the scale, with a unit length of 20 microns; accelerating voltage (EHT) = 2 kV, working distance (WD) = 4.6 mm, the distance from the objective lens lower pole piece to the sample surface. Sign A = SE 2. The SE2 detector is often mounted sideways on the sample chamber and receives secondary electrons as well as transmitted electrons and some backscattered electrons. Magnification (Mag) = 518x, Date: 27 Mar 2024, Time: 16:20:39.

[0064] Figure 5 Explanation: 10 μm is the ruler, with a unit length of 10 microns; accelerating voltage (EHT) = 2 kilovolts, working distance (WD) = 5 mm, the distance from the objective lens lower pole piece to the sample surface. Signa lA = InLens, the annular secondary electron detector (Inl ens detector) installed in the objective lens, magnification (Mag) = 650x, Date: 1 February 2024, Time: 16:24:25.

[0065] Figure 6 Explanation: 500nm is the ruler, with a unit length of 500 nanometers; accelerating voltage (EHT) = 2 kV, working distance (WD) = 4.9 mm, the distance from the objective lens lower pole piece to the sample surface. Signa lA = SE 2. The SE2 detector is usually mounted sideways on the sample chamber and receives secondary electrons, as well as transmitted electrons and some backscattered electrons. Magnification (Mag) = 20,000x, Date: 8 Sep 2023, Time: 17:26:53.

[0066] Figure 7 Explanation: 500nm is the ruler, with a unit length of 500 nanometers; accelerating voltage (EHT) = 2 kV, working distance (WD) = 5.1 mm, the distance from the objective lens lower pole piece to the sample surface. Sign A = SE 2. The SE2 detector is often mounted sideways on the sample chamber and receives secondary electrons, as well as transmitted electrons and some backscattered electrons. Magnification (Mag) = 20,000x, Date: 18 Sep 2023, Time: 16:55:58.

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

[0068] Figure 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 Figure 11 As shown in the figure, within a high vacuum tube, the electron beam generated by the electron gun is focused into a thin beam by an electron converging lens. It then scans and bombards the sample surface point by point, generating a series of electron signals (secondary electrons, backreflected electrons, transmitted electrons, absorbed electrons, etc.). These various electron signals are received by a detector, amplified by an electronic amplifier, and then input into a picture tube (CRT) controlled by a cathode ray tube (CRT) grid. The SE2 detector is often mounted sideways on 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) mounted within the objective lens is located in the electron beam path. Operating at a small working distance (WD < 5 mm) or low accelerating voltage, SE1 is accelerated by an electrostatic lens mounted below the objective lens, passing directly upward from the inner aperture of the objective lens pole piece and converging onto the detector surface. SE2 and other electrons are repelled. The objective lens receives only secondary electrons from the electron beam incident zone, resulting in high resolution and good image quality, but poor three-dimensional perception. The objective lens's function is to provide final focusing of the electron beam, further reducing and focusing the beam onto 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 the electron energy loss and the pollution of the electron light path, and to 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 、 Figure 9 、 Figure 10 and Figure 11 As shown, a temperature and humidity control device 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. Addressing the inaccurate temperature control of electric heating: This utility model proposes an external circulation water heating unit as an alternative to address the temperature control issues of electric heating. This unit provides more stable and precise temperature control by controlling the internal temperature of the equipment through an external circulating water system. This system avoids the temperature fluctuations associated with electric heating, providing a more uniform and stable temperature, thereby improving production process precision and product quality.

[0073] Second, humidity control in the drying section: This utility model proposes the use of effective humidification methods and an air distribution system to address the issue of inaccurate humidity control in the drying section. Humidification methods increase the humidity in the drying section, while the air distribution system ensures uniform temperature and humidity distribution within the drying section, avoiding production problems caused by uneven humidity distribution.

[0074] 3. Addressing uneven temperature and humidity distribution: The air distribution system evenly distributes air with low air volumes, effectively controlling the temperature and humidity of the drying process, improving production process stability and product quality. Furthermore, the air distribution system can reduce humidity in the drying process, which is particularly important for production processes requiring a low-humidity environment. The temperature and humidity control system and air distribution system enable testing in extreme drying environments, such as high temperature and low humidity, or low temperature and high humidity.

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

[0076] From the outlet of the spinneret liquid to the liquid level of the gel tank, all are within the closed small space of the dry process cover 1.

[0077] (1) Temperature control: In terms of temperature control inside 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 drying hood 1. The water bath system heats water to a predetermined temperature using an external heating device. A circulating pump then delivers the hot water into the drying hood 1. The hot water then transfers heat through copper conduits within the drying hood 1, maintaining the desired temperature. This temperature control method has the advantage of water's high heat capacity, providing a stable heat source and ensuring a stable temperature inside the drying hood 1. For sub-zero temperatures, the heat transfer medium can be replaced.

[0079] Copper conduit heat transfer: The copper conduit has excellent thermal conductivity, quickly and evenly transferring the heat from the hot water to the air inside the dryer hood 1, rapidly bringing the temperature inside the dryer hood 1 to the desired level. Furthermore, the copper conduit has excellent thermal stability, maintaining good thermal conductivity even in high-temperature environments for extended periods, thereby ensuring a stable temperature inside the dryer hood 1. The multi-coil design allows heat to be transferred through multiple paths, resulting in more even heat distribution within the dryer hood 1. Furthermore, the multi-coil design increases the contact area between the copper conduit and the air inside the dryer hood 1, improving heat exchange efficiency and thus increasing thermal efficiency and saving energy. This provides a clearer layout, facilitating maintenance and inspection, and reducing maintenance costs.

[0080] Temperature sensor feedback: A temperature sensor is installed inside the drying hood 1 to monitor the temperature inside the hood in real time and feed the temperature data back to the control system. If the temperature inside the drying hood 1 drops below or rises above a predetermined temperature, the control system automatically adjusts the heating power of the water bath to ensure a stable temperature inside the drying hood 1.

[0081] Manual Adjustment: Although the control system can automatically adjust the water bath's heating power, it may be necessary to manually adjust the water bath's temperature based on production needs or special circumstances. Using the control panel, the operator can manually adjust the water bath's temperature based on feedback from the temperature sensor to ensure that the desired temperature is reached within the drying hood 1 within a short period of 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: A comprehensive and intelligent control strategy is adopted to control the humidity in the drying hood 1, as follows:

[0084] Humidity Control by Gel Tank Evaporation: Since the hollow fiber spinning gel tank typically maintains a certain temperature, moisture naturally evaporates, creating a certain humidity environment. Adjusting the exhaust volume of the condensing fan during this process can control the basic humidity level within the drying chamber 1. If gel tank evaporation causes excessive humidity, exceeding the set range within the drying chamber 1, the exhaust fan activates to reduce the humidity within the drying chamber 1 to the set level. The exhaust fan quickly and effectively reduces humidity, preventing excessive humidity from adversely affecting the production process.

[0085] Humidifier Assisted Humidity Increase: When the gel tank evaporation fails to meet the set humidity requirement, the humidifier automatically activates and sprays to increase the humidity inside the drying hood 1 to the set humidity level. The use of a humidifier can quickly and effectively increase humidity to meet production needs.

[0086] Humidity sensor feedback control: A humidity sensor is installed inside drying hood 1, which monitors the humidity inside in real time and feeds this data back to the control system. Based on this feedback, the control system automatically adjusts the humidifier spray volume and exhaust fan air volume to maintain a stable humidity environment inside drying hood 1, thereby improving production process stability 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, which improves the stability of the production process and product quality. It is an efficient and practical air distribution system design.

[0088] Air distribution duct design: The air distribution duct adopts a hollow design. This design ensures that air can flow evenly from all parts of the air distribution duct, forming a small amount of turbulent air. This turbulent air effectively stirs the environment inside the drying hood 1, making the temperature and humidity distribution more uniform.

[0089] Air Distribution Duct Positioning: The air distribution duct is located between the water bath heating circuit copper tubes and the humidifier. This placement ensures that heated and humidified air first passes through the duct and is evenly distributed throughout the hood. Furthermore, air distribution ducts are located around the hood to direct conditioned air to specific locations. This design prevents localized overheating or overhumidification, ensuring more uniform temperature and humidity distribution within the drying hood.

[0090] When low-humidity processes are required, the air distribution system can adjust its air volume output, increasing air velocity and thus enhancing air exchange efficiency. In conjunction with the exhaust fan, the highly humid air within the drying hood 1 is quickly expelled while simultaneously drawing in more dry air, rapidly reducing the humidity level within the drying hood 1 to achieve the low-humidity environment required by the process. Improving production efficiency and product quality: By ensuring uniform temperature and humidity distribution within the drying hood 1, the air distribution system can improve production process stability and product quality, while also increasing production efficiency.

[0091] Example 3: Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 As shown, a temperature and humidity control device 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 and feedback system (a temperature and humidity sensor), and other devices. Figure 1As shown, the drying process cover 1, the air distribution duct, the outer insulation cover 2, the spinneret 3, the constant temperature water bath outlet 4, the exhaust fan 5, the atomizing humidifying device 6, the temperature sensor and the humidity sensor 7, the core liquid port 8, the multi-pipe copper coil 9, and the 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-pipe copper coil 9 is connected to the constant temperature water bath outlet 4, and the other end of the multi-pipe 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. 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 distribution 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 drying cover 1. The air distribution duct is located between the multi-pipe copper coil 9 and the temperature sensor and humidity sensor 7, forming turbulence to promote uniform distribution of temperature and humidity. The outer insulation cover 2 is located outside the drying cover 1 to play a role in insulation. The spinneret 3 is located in the center of the drying cover 1.

[0099] The bottom of the drying hood 1 is close to the liquid level in the gel tank, forming a small, sealed space between the liquid level and the drying hood 1, enabling temperature and humidity control in the drying section. The spinneret is located in the center of the drying hood 1. The height of the drying hood 1 can be adjusted up or down according to process requirements. Of course, it can be composed of multiple spinnerets, rather than just one.

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

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

[0102] The humidity sensor adjusts the exhaust fan and humidifier settings to maintain the set humidity. Simultaneously, a thermostat circulates a heat transfer medium (water or thermal oil, etc.) through the water inlet and into the copper conduit before discharging the water. The temperature inside dry cover 1 reaches the set temperature within 10 minutes, with the time increasing as the temperature deviates from ambient temperature. Heat dissipation is controlled through the outer insulation cover to maintain the set temperature. After maintaining the temperature and humidity constant for 10 minutes, spinning experiments are conducted.

[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] To prepare the casting solution, DMAC, PVP-K12, K30, and PES were mixed uniformly in a mass ratio of 25:5:5:65. After degassing, the solution was prepared. Spinning experiments were conducted using water as the coagulation fluid. The casting solution and core solution passed through the spinneret channels and into the spinneret dry-process control structure that enclosed the hollow membrane fibers. The dry-process height was maintained at 30 cm, the humidity was adjusted to 60%, and the temperature was adjusted to 15°C. The fibers then entered the gel bath for coagulation, resulting in a membrane with a finger-like pore structure in cross-section.

[0105] The outer layer thickness of a hollow fiber membrane significantly affects key performance indicators such as its permeation flux, retention rate, mechanical strength, and durability. Experimental results show that reducing the outer layer thickness can significantly increase the membrane's permeation flux. This phenomenon can be attributed to the thinner outer layer reducing the resistance of substances passing through the membrane, thereby accelerating the permeation process. However, the effect of reducing the outer layer thickness on the retention rate is relatively small, indicating 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 outer layer thickness. In addition, it is worth noting that reducing the outer layer thickness 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 exhibit better durability in long-term use.

[0106] This new technology opens up a new path for adjusting the thickness of the outer layer of hollow fiber membranes through precise control of temperature and humidity. Under the same liquid-core liquid formulation, fine-tuning of temperature and humidity can subtly influence the membrane formation process, thereby effectively regulating the outer layer thickness of the hollow fiber membrane.

[0107] In the traditional hollow fiber membrane preparation process, 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, high-humidity environments often lead to excessive thickness of the membrane outer layer, thereby affecting key properties such as the membrane's permeability and mechanical strength. However, the independent regulation of temperature and humidity in the present utility model 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 membrane outer layer.

[0108] This utility model revolutionizes the preparation process of hollow fiber membranes, not only optimizing membrane performance but also broadening their application in fields such as water treatment, biopharmaceuticals, and the food industry. For example, in water treatment, reducing the thickness of the membrane's outer surface layer can achieve higher water flux, improve filtration efficiency, and reduce energy consumption. In the biopharmaceutical industry, optimized mechanical strength and durability ensure membrane stability during complex biofluid processing, improving product purity and yield.

[0109] Example 4: Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 As shown, a temperature and humidity control device 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 high porosity and low flow resistance, which enables the material to exhibit better performance in applications such as liquid absorption and gas permeation. The pores in the sponge pore structure are interconnected, forming a sponge-like three-dimensional network. This structure helps improve the material's mechanical strength and pressure resistance. Therefore, by increasing the temperature of the gel tank, the sponge pore structure shown in the figure below can be obtained. Subsequently, by adding a dry process cover 1 and setting the temperature to 70°C and the humidity to 90%, the transition from finger-like pores to sponge pores can be achieved, and the overall structure is complete and uniform.

[0112] When preparing hollow fiber membranes in high-temperature, high-humidity environments, localized temperature and humidity nonuniformity often becomes a key factor affecting the membrane's structural integrity and performance. This nonuniformity can lead to the formation of nonideal structures during the curing process, such as finger-like pores or vesicles, rather than the desired sponge-like pore structure. These nonideal structures not only reduce the membrane's permeability but also affect its retention efficiency, resulting in reduced membrane production quality.

[0113] The present invention effectively solves the problem of uneven local temperature and humidity in high-temperature and high-humidity environments 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 fine retention 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 clogging, 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, reduce production costs, and provide 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 、 Figure 9 、 Figure 10 and Figure 11 As shown, a temperature and humidity control device for the dry section of a hollow fiber membrane.

[0115] During the preparation of hollow fiber membranes, low-temperature gel tanks are typically accompanied by low-humidity environments, which pose a challenge to improving membrane performance. While low temperatures help control the membrane's curing rate and ensure the formation of the membrane structure, low humidity often prevents the membrane's surface pores from fully opening, thereby affecting key membrane properties such as permeability and selectivity. Under low-temperature conditions, appropriately increasing the humidity through a humidification system can promote the full opening of the membrane's surface pores, raising the humidity within the dry process hood 1 from 20% to 70%. This is because moderate humidity can provide sufficient moisture to maintain a certain plasticity of the membrane material during the curing process, thereby facilitating the formation and expansion of membrane pores. The humidity regulation technology of the present invention can create a humidity condition that is more conducive to the formation of membrane pores in a low-temperature environment, ensuring the full opening of the membrane's surface pores, reducing the resistance of substances passing through the membrane, and thus significantly improving the membrane's permeability and increasing the membrane's flux. By precisely controlling the humidity, the size and distribution of the membrane pores can be adjusted, optimizing the membrane's selectivity, improving the retention efficiency of specific substances, and achieving a more refined separation effect.

[0116] Example 6: Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 As shown, a temperature and humidity control device 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 hollow fiber membranes 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, which is the critical 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 vary, which limits the application of membranes in the field of high-precision separation. By precisely controlling 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, while precise temperature control ensures stable conditions for the formation of membrane pores. Under these combined effects, the membrane pore size can be evenly distributed within a narrow range, greatly improving the separation accuracy of the membrane. Hollow fiber membranes with uniform pore size have more stable and reliable separation performance, and can achieve high-precision retention of specific molecules or particles while allowing other substances to pass freely. This characteristic has enormous application potential in industries requiring extremely high filtration precision, 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, improving drug purity and yield. In the water treatment field, membranes with uniform pore size can effectively remove microorganisms and pollutants from water, ensuring water quality safety.

[0119] The key feature of this utility model lies in its device structure, specifically designed for temperature and humidity control within the drying hood 1, demonstrating that the device is optimized for a specific application scenario. The device's inventiveness includes its ability to precisely adjust temperature and humidity, demonstrating high-precision environmental control capabilities to meet the requirements of temperature- and humidity-sensitive processes or storage systems. These capabilities likely involve advanced sensor technology, intelligent control systems, and precise actuator design to ensure stable operation within set ranges and rapid adjustment as needed.

[0120] The working principle of the dry run cover 1 temperature and humidity control device mainly relies on high-precision sensors, intelligent controllers, and efficient refrigeration dehumidification and humidification heating systems. These devices usually use PID (Proportional-Integral-Derivative) control algorithms to achieve fast response and precise regulation, ensuring temperature stability. Humidity control is more complex and needs to consider the influence of temperature on humidity. The system has built-in humidity sensors that continuously monitor indoor humidity levels and compare them with the set value. When the humidity is too high, the dehumidification mechanism starts to reduce the moisture content in the air through condensation dehumidification or adsorption dehumidification, etc. Conversely, if the humidity is too low, the humidification system is started to increase the indoor humidity using steam humidification or ultrasonic humidification technology. These control strategies ensure the accuracy and efficiency of humidity regulation.

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

[0122] Temperature control: electric heating is used for temperature control; water bath circulating medium can use other liquids to achieve lower or higher dry run temperature;

[0123] Humidity adjustment: humidifier and dehumidifier are used.

[0124] Example 7: as shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 A hollow fiber membrane dry run section temperature and humidity control method, containing the following steps:

[0125] At the beginning of the operation, first, according to the process requirements, preset the target temperature and humidity parameters, then the air distribution system is automatically activated to form a turbulent flow (the airflow is small and does not affect the membrane filaments), the air regulated by the copper coil pipe and the moderate humidification gas released by the humidifier are fully mixed and evenly distributed to the entire dry run cover 1 internal space, promoting the randomness of gas flow, accelerating the uniform distribution of temperature and humidity, making the temperature and humidity in the cover tend to be uniform.

[0126] When the temperature sensor detects that the actual temperature inside the dry run cover 1 deviates from the pre-set target value, the constant temperature water bath system responds immediately, and according to the deviation direction, intelligently starts heating or cooling to adjust the temperature of the circulating water. Thanks to the excellent heat conduction characteristics of the copper pipe coil, the adjusted temperature can be quickly and effectively transmitted to the inside of the dry run cover 1. This dynamic balance mechanism relies on continuous monitoring and immediate feedback of the sensor to ensure that the temperature inside the cover always closely matches the established standard and maintains an ideal constant state.

[0127] During operation, if the humidity sensor shows that the relative humidity inside the dry run cover 1 is lower than the expected set value, the atomizing humidifying device 6 immediately increases the working intensity and accelerates the water evaporation rate, effectively improving the humidity level inside the cover. Conversely, when the sensor indicates that the actual humidity exceeds the target value, the humidifier timely reduces the water vapor output, inhibits the accumulation of additional humidity, and promotes the recovery of the cover environment to the ideal state.

[0128] In the face of abnormally high humidity conditions, even if the atomizing humidifying device 6 is already in a shutdown state, but 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 of the target humidity, the system intelligently adjusts the exhaust volume to quickly remove excess humid air from the dry run cover 1 until the humidity inside the cover returns to the set range.

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

[0130] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. 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 atomizing and humidifying 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 water outlet of the constant temperature water bath, and the other end of the multi-pipe copper coil is connected to the water inlet of the constant temperature water bath. The water outlet and the water inlet of the constant temperature water bath are respectively connected to the dry process hood cavity, and the ports extend out of the dry process hood cavity. The temperature sensor and the humidity sensor are connected to the top of the dry process hood.

2. The temperature and humidity control device for the dry section of a hollow fiber membrane according to claim 1, characterized in that: The air distribution duct is located between the multi-pipe copper coil and the temperature sensor and humidity sensor.

3. The temperature and humidity control device for the dry section of a hollow fiber membrane according to claim 2, characterized in that: The air distribution duct adopts a hollow structure.

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