Hollow fiber membrane dehumidifier based on sine ripple structure and using method thereof

Abstract

The invention relates to the technical field of filtering membranes, and discloses a hollow fiber membrane dehumidifier based on a sinusoidal ripple structure and a using method of the hollow fiber membrane dehumidifier. The hollow fiber membrane filament bundle comprises a plurality of hollow fiber membrane filaments with sine curve shapes, and each hollow fiber membrane filament is provided with an inner cavity; and the variation ranges of the sine curve amplitude and wavelength absolute value of the adjacent parallel hollow fiber membrane filaments in the hollow fiber membrane filament bundle are both 25%-75%. According to the efficient hollow fiber membrane dehumidifier based on the sine ripple structure, the dehumidification efficiency of the assembly can be improved, the occupied space of the assembly structure can be reduced, and therefore the energy cost and the operation cost are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of filter membranes, and particularly relates to a hollow fiber membrane dehumidifier based on a sinusoidal corrugated structure and a method for using the same. Background Art

[0002] Traditional hollow fiber membrane dehumidifiers usually adopt a straight tube structure, with low mass transfer efficiency. For example, the straight tube structure results in a limited contact area between the wet air and the membrane surface, a short diffusion path for water vapor, which limits the dehumidification efficiency; the air flow distribution is uneven, such as the straight tube arrangement is prone to cause air flow short circuit or dead zones, with too high or too low humidity in local areas, affecting the overall dehumidification uniformity; the structural strength is insufficient, such as the straight tube membrane filaments are prone to break when bent or vibrated, especially under high humidity or high flow rate conditions, with poor stability. Summary of the Invention

[0003] To solve the existing problems, the present invention provides a hollow fiber membrane dehumidifier based on a sinusoidal corrugated structure, aiming to increase the membrane area and air-side air flow disturbance under the same volume, thereby improving the air dehumidification efficiency; it can replace traditional condensation or adsorption dehumidification equipment, meet the high-efficiency and low-energy consumption dehumidification requirements, be applicable to environments with limited space and sensitive to humidity fluctuations, and provide support for the efficient removal of air moisture in practical engineering.

[0004] To achieve the above object, the present invention provides the following technical solutions.

[0005] The present invention discloses a hollow fiber membrane dehumidifier based on a sinusoidal corrugated structure, which includes a plurality of hollow fiber membrane filaments; the hollow fiber membrane filaments include a plurality of hollow fiber membrane filaments with a sinusoidal curve shape, and the hollow fiber membrane filaments have an inner cavity; the absolute value change range of the amplitude and wavelength of the sinusoidal curves of adjacent parallel hollow fiber membrane filaments in the same hollow fiber membrane filament bundle is between 25% and 75%.

[0006] As a further improvement of the present invention, the amplitude of the sinusoidal curve formed by the hollow fiber membrane filaments is 0.5 - 2 times its outer diameter, and the wavelength of the sinusoidal curve formed by the hollow fiber membrane filaments is 50 - 150 times its outer diameter.

[0007] As a further improvement of the present invention, the hollow fiber membrane filament bundle includes two hollow fiber membrane filaments with a sinusoidal curve shape, and the phase difference between the sinusoidal curves formed by the two hollow fiber membrane filaments is 180°.

[0008] As a further improvement of the present invention, the hollow fiber membrane filament bundle includes three hollow fiber membrane filaments with a sinusoidal curve shape, the amplitudes of the sinusoidal curves formed by the three hollow fiber membrane filaments are A, 1 / 2A, and A in sequence; the wavelengths of the sinusoidal curves formed by the three hollow fiber membrane filaments are λ, 1 / 2λ, and λ in sequence; the phase differences between the sinusoidal curves formed by the three hollow fiber membrane filaments and the hollow fiber membrane filament bundle placed in the first place are 0, 0, and 180° in sequence.

[0009] As a further improvement of the present invention, the hollow fiber membrane filament bundle comprises four hollow fiber membrane filaments with a sinusoidal curve shape, and the amplitudes of the sinusoidal curves formed by the four hollow fiber membrane filaments are A, 1 / 2A, 1 / 2A, and A in sequence; the wavelengths of the sinusoidal curves formed by the four hollow fiber membrane filaments are λ, 1 / 2λ, 1 / 2λ, and λ in sequence; the phase differences between the sinusoidal curves formed by the four hollow fiber membrane filaments and the hollow fiber membrane filament bundle placed at the first position are 0, 0, 180°, and 180° in sequence.

[0010] As a further improvement of the present invention, the plurality of hollow fiber membrane filament bundles are arranged in an unfolded manner to form a layer of hollow fiber membrane, and the distance between the hollow fiber membranes is 1 - 10 times the outer diameter of the hollow fiber membrane filaments, and multiple layers of hollow fiber membranes form a three-dimensional structure.

[0011] As a further improvement of the present invention, the hollow fiber membrane filament material is a polyvinyl alcohol / polyvinylidene fluoride composite membrane (PVA / PVDF).

[0012] As a further improvement of the present invention, it further comprises a closed-end base, a vacuum buffer container, and a vacuum pump; the inner cavities of the hollow fiber membrane filament bundles are respectively communicated with the inner cavities of the closed-end base and the vacuum buffer container provided at both ends of the hollow fiber membrane filament bundles, and the inner cavity of the vacuum buffer container is connected to the vacuum pump.

[0013] As a further improvement of the present invention, the absolute pressure in the inner cavity of the hollow fiber membrane filament is in the range of 0.5 - 5 kPa.

[0014] The present invention also discloses a method for using a hollow fiber membrane dehumidifier based on a sinusoidal corrugated structure, comprising the following steps: The length direction of the hollow fiber membrane filament bundle is perpendicular to the external air flow direction.

[0015] The present invention has the following beneficial effects: The sinusoidal corrugated structure increases the effective surface area of the membrane filaments, extends the water vapor diffusion path length, promotes the contact between the wet air and the membrane surface, and improves the mass transfer efficiency; the periodic corrugations can guide the uniform distribution of the air flow, reduce the dead zone, avoid local over-wetting or drying, and improve the overall dehumidification uniformity; the absolute value change ranges of the amplitudes and wavelengths of the sinusoidal curves of adjacent membrane filaments are both between 25% and 75%, which is beneficial to retaining the voids for gas flow, and at the same time avoids the formation of a slope backflow by the row of membrane filaments, weakening the dehumidification effect of the membrane filaments arranged at the back.

[0016] Preferably, the amplitude and wavelength parameter ranges ensure a balance between the mechanical strength and flexibility of the corrugated structure, avoiding the fracture or collapse of the membrane filaments caused by excessive bending; this parameter range facilitates the formation of the sinusoidal corrugations through processes such as heat setting and mechanical stretching, reducing the manufacturing difficulty.

[0017] Optionally, the asymmetric channel structure generated by the phase difference arrangement can break the laminar boundary layer and induce periodic eddy currents; the secondary flow effect enhances radial mixing and reduces the concentration polarization phenomenon; the air flow trajectory changes from a straight line to a spiral shape, and the contact time is extended by 30 - 50%.

[0018] Preferably, the combination of different amplitudes and wavelengths can break the laminar boundary layer, induce the air flow to generate multi-scale eddy currents, enhance the turbulence degree of the gas-film interface, and reduce the concentration polarization phenomenon; the combination of different wavelengths and amplitudes can arrange the membrane filaments more closely in a limited space, increasing the effective membrane area per unit volume; the non-periodic bending can adapt to different wind speed conditions and still maintain a good disturbance effect at low flow rates, avoiding the formation of "dead zones"; the dynamic disturbance can reduce pollutant deposition, delay membrane fouling, reduce the cleaning frequency, and lower the maintenance cost.

[0019] Preferably, the combination of four filament bundles further refines the dehumidification area, realizes multi-dimensional fluid regulation through different amplitudes, wavelengths and phase differences, and adapts to complex working conditions; it can still maintain a good disturbance effect at low flow rates, avoiding the formation of "dead zones".

[0020] Preferably, the multi-layer hollow fiber membrane forms a three-dimensional structure, which can further increase the effective surface area between the membrane filaments and the air, promote the contact between the humid air and the membrane surface, and improve the mass transfer efficiency; the periodic corrugations can guide the uniform distribution of the air flow, avoid local over-wetting or drying, and enhance the overall dehumidification uniformity.

[0021] Preferably, the PVA / PVDF composite membrane combines hydrophilicity (PVA) and chemical resistance (PVDF) to achieve efficient water vapor permeation and long-term stability; the PVDF matrix enhances the tensile and tear resistance of the membrane, adapting to the complex deformation of the sinusoidal corrugated structure.

[0022] Preferably, the buffer container balances the air extraction rate of the vacuum pump and the pressure change in the inner cavity of the membrane filament, avoiding the decrease in dehumidification efficiency caused by pressure fluctuations.

[0023] Preferably, the pressure range of 0.5 - 5 kPa ensures that a sufficient transmembrane pressure difference is formed on both sides of the membrane, driving water vapor to diffuse from the humid air side to the vacuum side, while avoiding the collapse of the membrane filaments caused by excessive pressure; on the premise of meeting the dehumidification efficiency, it reduces the energy consumption of the vacuum pump and improves the energy efficiency ratio of the system.

[0024] The present invention also discloses a method for using a hollow fiber membrane dehumidifier based on a sinusoidal corrugated structure. The vertical arrangement enables the humid air to fully contact the surface of the membrane filaments, extends the mass transfer path, and improves the dehumidification efficiency; the vertical arrangement reduces the direct impact of the air flow on the membrane filaments, avoids local overload, and ensures the uniform distribution of the air flow; the vertical arrangement saves space, facilitates the arrangement of more membrane filaments in a limited volume, and enhances the dehumidification capacity per unit volume. Description of the Drawings

[0025] The accompanying drawings described herein are for illustrative purposes only and do not limit the scope of the disclosure of the present invention in any way. Additionally, the shapes and proportional dimensions of the components in the drawings are only schematic and are used to assist in understanding the present invention, rather than specifically defining the shapes and proportional dimensions of the components of the present invention. In the drawings: Figure 1 is an external schematic view of a hollow fiber membrane dehumidifier based on a sine corrugated structure in an embodiment of the present invention; Figure 2 is a schematic view of the periodic arrangement of a single-layer hollow fiber membrane filament bundle in an embodiment of the present invention; Figure 3 is a schematic view of the structure of a single bent hollow fiber membrane filament in an embodiment of the present invention; Figure 4 is a schematic view of the comparison of periodic unit structures in an embodiment of the present invention; Wherein, 1. Closed-end base; 2. Hollow fiber membrane filament bundle; 3. Vacuum buffer container; 4. Vacuum pump; 5. Fiber unit; 6. Membrane tube; 7. Inner cavity; 8. Single straight fiber unit; 9. Single bent fiber unit; 10. Double bent fiber unit; 11. Triple bent fiber unit; 12. Quadruple bent fiber unit. Detailed implementation manners

[0026] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can also be an intervening element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0029] AsFigure 1 As shown in the figure, a hollow fiber membrane dehumidifier based on a sine corrugated structure includes a plurality of hollow fiber membrane bundles 2, a closed-end base 1, a vacuum buffer container 3, and a vacuum pump 4. The hollow fiber membrane bundles 2 include a plurality of hollow fiber membrane filaments with a sine curve shape. The absolute value change ranges of the sine curve amplitude and wavelength of adjacent parallel hollow fiber membrane filaments in the same hollow fiber membrane bundle 2 are both between 25% and 75%. The inner cavity 7 of the hollow fiber membrane bundle 2 is respectively connected to the inner cavities 7 of the closed-end base 1 and the vacuum buffer container 3 provided at both ends of the hollow fiber membrane bundle 2, and the inner cavity 7 of the vacuum buffer container 3 is connected to the vacuum pump 4.

[0030] Specifically, as Figure 2 shown in the figure, the hollow fiber membrane bundles 2 are cyclically repeated in space to form a uniform single-layer periodic arrangement, and multiple layers of arrangement can fix both ends to form a three-dimensional structure. Through this periodic arrangement structure, the laminar boundary layer can be effectively destroyed, inducing controllable vortex disturbances in the external air and improving the overall mass transfer effect. At the same time, through the spatial curved surface arrangement design, the membrane surface area is greatly increased compared with the straight filament structure under the same component volume, and the dehumidification capacity of the component per unit volume is improved.

[0031] Specifically, as Figure 3 shown in the figure, the outer shape of the hollow fiber membrane filament is a sine curve, and its shape can be determined by the amplitude A and wavelength λ of the sine curve. There is a phase difference φ between adjacent parallel hollow fiber membrane filaments in the same hollow fiber membrane bundle 2. As Figure 3 shown in the figure, the sine curve of the hollow fiber membrane filament can be expressed as A*sin(pi*x / λ) or A*sin(pi*(x + φ) / λ) along the length variable x, amplitude A, and wavelength λ, that is, the distance of the hollow fiber membrane filament from the center line. The external air flow direction of the hollow fiber membrane filament is perpendicular to the normal of the hollow fiber membrane filament, and the inner diameter of the membrane tube 6 of the hollow fiber membrane filament is uniform along the length, and the air in the inner cavity 7 is discharged through the vacuum pump 4.

[0032] The amplitude of the sine curve of the hollow fiber membrane filament is 0.5 - 2 times its outer diameter, and the wavelength of the sine curve of the hollow fiber membrane filament is 50 - 150 times its outer diameter.

[0033] The material of the hollow fiber membrane filament is a polyvinyl alcohol / polyvinylidene fluoride composite membrane (PVA / PVDF).

[0034] When the hollow fiber membrane dehumidifier works, the gas to be treated flows in a direction perpendicular to the axial direction of the membrane module, and its flow vector is orthogonal to the normal direction of the surface of the hollow fiber membrane filament. The inner cavity 7 of the hollow fiber membrane filament is connected to the vacuum pump 4 through the vacuum buffer container 3, and the vacuum pump 4 maintains a dynamic negative pressure environment with an absolute pressure of 0.5 - 5 kPa in the inner cavity 7 of the hollow fiber membrane filament.

[0035] The hollow fiber membrane filament bundle 2 can be composed of several hollow fiber membrane filaments with a sinusoidal curve shape, which can be one, two, three, four, or even more than four filaments.

[0036] Preferably, as Figure 2 shown, four curved hollow fiber membrane filaments a, b, c, and d form a periodic unit structure, the fiber unit 5. The sinusoidal curve forms of the multiple filaments in the fiber unit 5 can be referred to Table 1 below. The shapes of the filaments c and d in the fiber unit 5 are centrosymmetric with respect to the shapes of the filaments a and b in the fiber unit 5.

[0037] Table 1 Sinusoidal curve forms of the fiber unit 5

[0038] Example 1 As Figure 4 shown, the hollow fiber membrane filament bundle 2 is composed of a single curved fiber unit 9. The sinusoidal curve of the filament in the single curved fiber unit 9 can be expressed as 0.65*sin(pi*x / 65). A number of hollow fiber membrane filament bundles 2 are arranged periodically and parallelly along a straight line to form a layer of hollow fiber membrane in Example 1. Through simulation analysis, compared with the comparative example, the dehumidification capacity of the hollow fiber membrane in Example 1 decreases by 1.11% under steady state, the corresponding effective membrane area increases by 0.02%; the fluid pressure drop decreases by 18.8%; the efficiency ratio of the membrane area increment to the change in dehumidification capacity (ΔS / ΔQ) is -45.06.

[0039] It can be seen that by using a single curved fiber unit 9, the membrane area of the hollow fiber membrane slightly increases while the dehumidification efficiency decreases reversely. Although the pressure drop decreases by 18.8%, the comprehensive efficiency ratio shows a negative shift.

[0040] Example 2 As Figure 4 shown, the hollow fiber membrane filament bundle 2 is composed of two curved fiber filaments a and b; the two curved fiber filaments a and b form a double-curved fiber unit 10, which serves as a periodic unit structure; the sinusoidal curves of the filaments a and b in the double-curved fiber unit 10 can be expressed as 0.65*sin(pi*x / 65) and -0.65*sin(pi*x / 65) respectively. The phase difference of the sinusoidal curves presented by the two hollow fiber membrane filaments is 180°. A number of hollow fiber membrane filament bundles 2 are arranged periodically and parallelly along a straight line to form a layer of hollow fiber membrane in Example 2. Through simulation analysis, compared with the comparative example, the dehumidification capacity of the hollow fiber membrane in Example 2 increases by 0.08% under steady state, the corresponding effective membrane area increases by 0.02%; the fluid pressure drop increases by 93%; the efficiency ratio of the membrane area increment to the change in dehumidification capacity (ΔS / ΔQ) is 3.38.

[0041] It can be seen that by using double-root group hollow fiber membrane filaments, the hollow fiber membrane can achieve a positive gain in dehumidification efficiency, but the increase in pressure drop is significant, restricting the feasibility of practical applications.

[0042] Example 3 In this embodiment, the hollow fiber membrane filament bundle 2 includes three hollow fiber membrane filaments with a sinusoidal curve shape. The amplitudes of the sinusoidal curves of the three hollow fiber membrane filaments are A, 1 / 2A, and A in sequence; the wavelengths of the sinusoidal curves of the three hollow fiber membrane filaments are λ, 1 / 2λ, and λ in sequence; the phase differences between the sinusoidal curves of the three hollow fiber membrane filaments and the first hollow fiber membrane filament bundle are 0, 0, and 180° in sequence.

[0043] Specifically, as Figure 4 shown, the hollow fiber membrane filament bundle 2 is composed of three curved fiber membrane filaments a, b, and c; the three curved fiber membrane filaments a, b, and c form a three-curved fiber unit 11, which serves as a periodic unit structure; the sinusoidal curves of the membrane filaments a, b, and c in the three-curved fiber unit 11 can be respectively expressed as 0.65*sin(pi*x / 65), 0.325*sin(pi*x / 32.5), and -0.65*sin(pi*x / 65). A number of hollow fiber membrane filament bundles 2 are arranged periodically and parallelly along a straight line to form a layer of hollow fiber membrane in Example 3. Through simulation analysis, compared with the comparative example, the dehumidification capacity of the hollow fiber membrane in Example 3 increases by 0.24% under steady state, and the corresponding effective membrane area increases by 0.02%; the fluid pressure drop increases by 68.3%; the efficiency ratio (ΔS / ΔQ) of the membrane area increment to the change in dehumidification capacity is 10.54.

[0044] It can be seen that by using three-group hollow fiber membrane filaments, the increase in fluid pressure drop is reduced by 24.7% compared with Example 3.

[0045] Example 4 The hollow fiber membrane filament bundle 2 includes four hollow fiber membrane filaments with a sinusoidal curve shape. The amplitudes of the sinusoidal curves of the four hollow fiber membrane filaments are A, 1 / 2A, 1 / 2A, and A in sequence; the wavelengths of the sinusoidal curves of the four hollow fiber membrane filaments are λ, 1 / 2λ, 1 / 2λ, and λ in sequence; the phase differences between the sinusoidal curves of the four hollow fiber membrane filaments and the first hollow fiber membrane filament bundle are 0, 0, 180°, and 180° in sequence.

[0046] Specifically, as Figure 4 shown, the hollow fiber membrane filament bundle 2 is composed of four curved fiber membrane filaments a, b, c, and d; the four curved fiber membrane filaments a, b, c, and d form a four-curved fiber unit 12, which serves as a periodic unit structure; the sinusoidal curve form of the four-curved fiber unit 12 can be referred to Table 2 below.

[0047] Table 2 Curve forms of four bent fiber units 12

[0048] A number of hollow fiber membrane filaments 2 are arranged periodically and parallelly along a straight line to form a layer of hollow fiber membrane in Example 4. Through simulation analysis, compared with the comparative example, the dehumidification capacity of the hollow fiber membrane in Example 4 increases by 0.38% under steady state, corresponding to an increase in the effective membrane area of 0.02%; the fluid pressure drop increases by 59.8%; the efficiency ratio (ΔS / ΔQ) of the membrane area increment to the change in dehumidification capacity is 17.29.

[0049] It can be seen that by using the four-group hollow fiber membrane filaments, the hollow fiber membrane achieves the highest dehumidification gain and the optimal pressure drop control under the condition of the smallest increase in membrane area, and the efficiency ratio reaches 17.29.

[0050] Comparative example As Figure 4 shown, the hollow fiber membrane filament bundle 2 is composed of a single straight fiber unit 8, and a number of hollow fiber membrane filament bundles 2 are arranged periodically and parallelly along a straight line to form the hollow fiber membrane in the comparative example. Through simulation analysis, the dehumidification capacity under steady state is the reference value Q, corresponding to the effective membrane area being the reference value S; the fluid pressure drop is the reference value P. The membrane area increment can be obtained by taking the difference between the membrane area measured in the example and the membrane area measured in the comparative example; the change in dehumidification capacity can be obtained by taking the difference between the dehumidification capacity measured in the example and the dehumidification capacity measured in the comparative example; the efficiency ratio of the membrane area increment to the change in dehumidification capacity can be obtained by dividing the membrane area increment by the change in dehumidification capacity.

[0051] For the comparison of the key data of the above Examples 1-4 and the comparative example, see Table 3 below.

[0052] Table 3 Results of Comparative Examples 1-4 and the Comparative Example

[0053] The membrane area increment is the proportion of the membrane area increased by the designed structure compared with the traditional straight membrane filament structure; the change in dehumidification capacity is the proportion of the change in dehumidification capacity of the designed structure compared with the traditional straight membrane filament structure; dividing the proportion of the increased membrane area of the designed structure by the proportion of the change in dehumidification capacity can obtain the impact of the increased membrane area on the overall dehumidification effect. If the efficiency ratio is positive, it indicates that the increase in membrane area has improved the dehumidification effect; if it is negative, it indicates that the increase in area has worsened the dehumidification effect; the use of the efficiency ratio can help determine which arrangement method achieves the best balance between the membrane area and the dehumidification effect, so as to select the optimal scheme.

[0054] Fluid pressure drop refers to the situation where, when fluid passes through a membrane module, due to reasons such as friction, bending, and narrow channels, the pressure between the inlet and the outlet will decrease, and this pressure difference is the pressure drop. The magnitude of the pressure drop will affect the overall energy consumption of the system, system stability, and system performance balance. When the pressure drop is too large, a larger fan and more energy consumption are required to allow the fluid to pass through. At the same time, an excessive pressure drop may cause pipeline vibration, noise, and even equipment damage; while when the pressure drop is too small, the fluid may flow quickly over the membrane surface, resulting in poor dehumidification effect. Therefore, it is necessary to comprehensively consider the fluid pressure drop and dehumidification performance, and select a suitable component structure to achieve the best dehumidification effect and less energy consumption.

[0055] In summary, by comparing the comprehensive effects of different periodic arrangement methods on the dehumidification efficiency, effective membrane area, and fluid pressure drop under the same volume constraint, the technical solution with the optimal efficiency ratio and pressure drop balance is selected, that is, the four bent fiber units 12 in Embodiment 4. At the same time, since the single bent fiber unit 9 in Embodiment 1 is inferior to the single straight fiber unit 8, the single bent fiber unit 9 is not recommended.

[0056] The present invention also discloses a method for using a hollow fiber membrane dehumidifier based on a sine corrugated structure, including the following steps: The length direction of the hollow fiber membrane filament bundle 2 is perpendicular to the external air flow direction.

[0057] The above embodiments are merely one of the implementation manners capable of implementing the technical solution of the present invention. The scope of protection required by the present invention is not limited only by this embodiment, but also includes any changes, substitutions, and other implementation manners that are easily conceivable by those skilled in the art within the technical scope disclosed by the present invention. Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hollow fiber membrane dehumidifier based on a sinusoidal corrugated structure, characterized in that, It includes a plurality of hollow fiber membrane filament bundles; each of the hollow fiber membrane filament bundles includes a plurality of hollow fiber membrane filaments with a sinusoidal curve shape, and the hollow fiber membrane filaments have inner cavities; the absolute value change ranges of the amplitudes and wavelengths of the sinusoidal curves of the adjacent and parallel hollow fiber membrane filaments in the same hollow fiber membrane filament bundle are both between 25% and 75%.

2. The hollow fiber membrane dehumidifier based on a sine corrugated structure according to claim 1, characterized in that, The amplitude of the sinusoidal curve formed by the hollow fiber membrane filament is 0.5 - 2 times its outer diameter, and the wavelength of the sinusoidal curve formed by the hollow fiber membrane filament is 50 - 150 times its outer diameter.

3. The hollow fiber membrane dehumidifier based on a sinusoidal corrugated structure according to claim 2, wherein The hollow fiber membrane filament bundle includes two hollow fiber membrane filaments with a sinusoidal curve shape, and the phase difference between the sinusoidal curves formed by the two hollow fiber membrane filaments is 180°.

4. The hollow fiber membrane dehumidifier based on a sine corrugated structure according to claim 2, characterized in that, The hollow fiber membrane filament bundle includes three hollow fiber membrane filaments with a sinusoidal curve shape. The amplitudes of the sinusoidal curves formed by the three hollow fiber membrane filaments are A, 1 / 2A, and A in sequence; the wavelengths of the sinusoidal curves formed by the three hollow fiber membrane filaments are λ, 1 / 2λ, and λ in sequence; the phase differences between the sinusoidal curves formed by the three hollow fiber membrane filaments and the hollow fiber membrane filament bundle placed in the first position are 0, 0, and 180° in sequence.

5. The hollow fiber membrane dehumidifier based on a sine corrugated structure according to claim 2, wherein The hollow fiber membrane filament bundle includes four hollow fiber membrane filaments with a sinusoidal curve shape. The amplitudes of the sinusoidal curves formed by the four hollow fiber membrane filaments are A, 1 / 2A, 1 / 2A, and A in sequence. The wavelengths of the sinusoidal curves formed by the four hollow fiber membrane filaments are λ, 1 / 2λ, 1 / 2λ, and λ in sequence; the phase differences between the sinusoidal curves formed by the four hollow fiber membrane filaments and the hollow fiber membrane filament bundle placed in the first position are 0, 0, 180°, and 180° in sequence.

6. The hollow fiber membrane dehumidifier based on a sine corrugated structure according to claim 1, wherein The plurality of hollow fiber membrane filament bundles are arranged in an unfolded manner to form a layer of hollow fiber membrane. The spacing of the hollow fiber membrane is 1 - 10 times the outer diameter of the hollow fiber membrane filament, and multiple layers of hollow fiber membranes form a three-dimensional structure.

7. The hollow fiber membrane dehumidifier based on a sine corrugated structure according to claim 1, wherein The material of the hollow fiber membrane filament is a polyvinyl alcohol / polyvinylidene fluoride composite membrane.

8. The hollow fiber membrane dehumidifier based on a sinusoidal corrugated structure according to claim 1, characterized in that It further includes a closed-end base, a vacuum buffer container, and a vacuum pump; the inner cavities of the hollow fiber membrane filaments are respectively communicated with the inner cavities of the closed-end base and the vacuum buffer container provided at both ends of the hollow fiber membrane filament bundle, and the inner cavity of the vacuum buffer container is connected to the vacuum pump.

9. The hollow fiber membrane dehumidifier based on a sinusoidal corrugated structure according to claim 8, wherein, The absolute pressure in the inner cavity of the hollow fiber membrane filament is between 0.5 - 5 kPa.

10. The usage method of a hollow fiber membrane dehumidifier based on a sine corrugated structure according to any one of claims 1 to 9, characterized in that, It includes the following steps: The length direction of the hollow fiber membrane filament bundle is perpendicular to the external air flow direction.

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