Hollow fiber membrane bundle and preparation method and application thereof

Abstract

The present invention relates to the technical field of hollow fiber membrane preparation, specifically to a hollow fiber membrane bundle and a preparation method and application thereof. The hollow fiber membrane bundle comprises a hollow fiber membrane, wherein the hollow fiber membrane is radially provided with a braided wire for fixing the distance between the fiber membranes, and a limiting wire is provided between the braided wires, and the limiting wire is parallel to the hollow fiber membrane. The hollow fiber membrane fixed by the braided wires and the limiting wires is rolled up radially with a hollow fiber membrane as the starting point to obtain a hollow fiber membrane bundle. The present invention forms a gap between the hollow fiber membranes by setting the braided wires and the limiting wires, and the hollow fiber membranes are always in a parallel state. The limiting wires pull the braided wires, and the braided wires will not be displaced or aggregated, which greatly improves the filtration efficiency of the hollow fiber membrane.

Description

Technical Field

[0001] The invention relates to the technical field of hollow fiber membrane preparation, in particular to a hollow fiber membrane bundle and a preparation method and application thereof. Background Art

[0002] As a self-supporting membrane material, hollow fiber membrane has been widely used in the fields of chemical industry, medicine and food due to its unique structure and excellent performance. It has a fiber-like appearance and a hollow structure inside. It not only has efficient separation ability, but also has high mechanical strength and chemical stability.

[0003] Hollow fiber membrane is an asymmetric membrane, and its structure mainly includes a dense layer and a porous support layer. The dense layer is usually located on the outer or inner surface of the fiber, and is used to achieve selective permeation of substances. The porous support layer is located under the dense layer, providing mechanical support and permeation channels for the membrane.

[0004] In actual use, hollow fiber membranes are mostly gathered into a bundle, with the liquid phase passing through the inside and the gas phase overflowing from the surface, thus achieving gas-liquid separation. However, when deoxygenating boiler water, due to the high temperature of the boiler water, the hollow fiber membrane will deform a little, causing adjacent membrane bundles to stick together, resulting in a significant reduction in deoxygenation efficiency, affecting the normal use of the boiler. Summary of the invention

[0005] In view of the above deficiencies in the prior art, the object of the present invention is to provide a hollow fiber membrane bundle. By setting braiding wires and limiting wires, gaps are formed between the hollow fiber membranes. The hollow fiber membranes are always in a parallel state. The limiting wires pull the braiding wires, and the braiding wires will not be displaced or aggregated, thereby greatly improving the filtration efficiency of the hollow fiber membranes.

[0006] Another object of the present invention is to provide a method for preparing a hollow fiber membrane bundle. By means of the "S-shaped" reciprocating arrangement of the clamp and the hollow fiber membrane, the hollow fiber membrane is always in a tensioned state during the weaving process, thus avoiding the problem of hollow fiber membrane fitting during weaving. The process is simple and is conducive to industrial production.

[0007] The third object of the present invention is to provide an application of a hollow fiber membrane bundle for use in a hollow fiber membrane assembly for deionized water deoxygenation in the chemical, pharmaceutical, and food fields, especially boiler water deoxygenation.

[0008] The present invention is achieved by adopting the following technical solutions:

[0009] The hollow fiber membrane bundle comprises a hollow fiber membrane. The hollow fiber membrane is radially provided with a braided wire for fixing the distance between the fiber membranes. Limiting lines are provided between the braided wires. The limiting lines are parallel to the hollow fiber membrane. The hollow fiber membrane fixed by the braided wires and the limiting lines is rolled up radially with one hollow fiber membrane as the starting point to obtain a hollow fiber membrane bundle.

[0010] Both ends of the hollow fiber membrane are open, and the diameter of the hollow fiber membrane is 0.35-0.40 mm.

[0011] The braided wire connection between the hollow fiber membranes is provided with a braided wire interlacing point, and the material of the braided wire is one of polyester or nylon.

[0012] The diameter of the braided wire is 0.08-0.12 mm, the diameter of the limit wire is 0.08-0.12 mm, and the limit wire and the braided wire are made of the same material.

[0013] In the hollow fiber membrane bundle, the distance between adjacent hollow fiber membranes is 0.1-0.2 mm.

[0014] In the hollow fiber membrane bundle, the distance between adjacent braided wires is 3-5 mm, and a limit line is set every 3-8 hollow fiber membranes.

[0015] The method for preparing the hollow fiber membrane bundle comprises the following steps:

[0016] a. The hollow fiber membrane is set in an "S-shaped" reciprocating manner. When it reaches one end, it is fixed by a clamp, and then the hollow fiber membrane is pulled back, and this process is repeated;

[0017] b. In the radial direction of the hollow fiber membrane, a braiding wire is provided, by which the hollow fiber membrane is woven into a membrane sheet, and a limit wire is provided between adjacent braiding wires;

[0018] c. Roll up the woven membrane sheet radially with a hollow fiber membrane as the starting point. While rolling up, apply a sealant layer to both sides of the membrane sheet to obtain a hollow fiber membrane bundle semi-finished product. Then, cut off the bends at both ends of the semi-finished product to obtain a hollow fiber membrane bundle.

[0019] The clamp is used to fix the hollow fiber membrane and generate an outward force thereto, so as to increase the tension of the hollow fiber membrane during weaving so that the membranes do not fit each other.

[0020] In the hollow fiber membrane bundle, the weaving method is one of crochet or interweaving.

[0021] The hollow fiber membrane bundle is used for a hollow fiber membrane assembly, a shell is provided outside the hollow fiber membrane assembly, a hollow fiber membrane bundle is provided inside the shell, a water inlet and a water outlet are provided at both ends of the shell, a vacuum port is provided on the shell, and the vacuum port is located between two sealing layers. The length of the hollow fiber membrane assembly is 1-1.5m. The sealing layer is used to bond the hollow fiber membrane and play a sealing role.

[0022] The hollow fiber membrane bundle is used for deionizing water and removing oxygen.

[0023] The hollow fiber membrane bundle is used in the fields of chemical industry, medicine and food, and is preferably used for deoxygenation of boiler water.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The present invention forms a gap between the hollow fiber membranes by setting the braiding wires and the limiting wires. The hollow fiber membranes are always in a parallel state. The limiting wires pull the braiding wires, and the braiding wires will not be displaced or aggregated, which greatly improves the filtration efficiency of the hollow fiber membranes.

[0026] (2) The method for preparing a hollow fiber membrane bundle provided by the present invention uses an "S-shaped" reciprocating arrangement of a clamp and a hollow fiber membrane so that the hollow fiber membrane is always in a tensioned state during the weaving process, thereby avoiding the problem of the hollow fiber membrane being fitted together during weaving. The process is simple and is conducive to industrial production.

[0027] (3) The hollow fiber membrane bundle provided by the present invention is used in a hollow fiber membrane module, which is used in the chemical, pharmaceutical and food fields, especially in boiler water deoxygenation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a cross-sectional view of a hollow fiber membrane bundle of the present invention;

[0029] Figure 2 It is a partial enlarged view of the hollow fiber membrane bundle of the present invention;

[0030] Figure 3 It is a schematic diagram of the structure of the hollow fiber membrane after weaving of the present invention;

[0031] Figure 4 It is a schematic diagram of the structure of the hollow fiber membrane of the present invention when it is woven;

[0032] Figure 5 It is a schematic structural diagram of the hollow fiber membrane module of the present invention;

[0033] In the figure: 1. hollow fiber membrane; 2. braided wire; 3. braided wire interlacing point; 4. limit line; 5. clamp; 6. sealant layer; 7. water inlet; 8. vacuum port; 9. water outlet. DETAILED DESCRIPTION

[0034] In order to make the purpose and technical solution of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0035] Example 1

[0036] Both ends of the hollow fiber membrane 1 are open, and the diameter of the hollow fiber membrane 1 is 0.38mm. A braided wire interlacing point 3 is provided at the connection of the braided wires 2 between the hollow fiber membranes 1, and the material of the braided wires 2 is polyester. The diameter of the braided wire 2 is 0.1mm, and the diameter of the limit wire 4 is 0.1mm. The limit wire 4 is made of the same material as the braided wire 2. The distance between adjacent hollow fiber membranes 1 is 0.15mm. The distance between adjacent braided wires 2 is 4mm, and a limit wire 4 is set every 5 hollow fiber membranes. The weaving method is interlacing.

[0037] The method for preparing a hollow fiber membrane bundle comprises the following steps:

[0038] a. The hollow fiber membrane 1 is set to be "S-shaped" reciprocatingly, and when it reaches one end, it is fixed by the clamp 5, and then the hollow fiber membrane 1 is pulled back, and so on;

[0039] b. In the radial direction of the hollow fiber membrane 1, a braided wire 2 is provided, and the hollow fiber membrane 1 is woven into a membrane by the braided wire 2, and a limit wire 4 is provided between adjacent braided wires 2;

[0040] c. The woven membrane sheet is rolled up radially with a hollow fiber membrane 1 as the starting point. While rolling up, a sealant layer 6 is applied to both sides of the membrane sheet to obtain a hollow fiber membrane bundle semi-finished product. The bends at both ends of the semi-finished product are then cut off to obtain a hollow fiber membrane bundle A.

[0041] Example 2

[0042] Both ends of the hollow fiber membrane 1 are open, and the diameter of the hollow fiber membrane 1 is 0.40 mm. A braided wire interlacing point 3 is provided at the connection of the braided wires 2 between the hollow fiber membranes 1, and the material of the braided wires 2 is nylon. The diameter of the braided wire 2 is 0.12 mm, and the diameter of the limit wire 4 is 0.12 mm. The limit wire 4 is made of the same material as the braided wire 2. The distance between adjacent hollow fiber membranes 1 is 0.2 mm. The distance between adjacent braided wires 2 is 5 mm, and a limit wire 4 is provided for every 8 hollow fiber membranes. The weaving method is hook weaving.

[0043] The method for preparing a hollow fiber membrane bundle comprises the following steps:

[0044] a. The hollow fiber membrane 1 is set to be "S-shaped" reciprocatingly, and when it reaches one end, it is fixed by the clamp 5, and then the hollow fiber membrane 1 is pulled back, and so on;

[0045] b. In the radial direction of the hollow fiber membrane 1, a braided wire 2 is provided, and the hollow fiber membrane 1 is woven into a membrane by the braided wire 2, and a limit wire 4 is provided between adjacent braided wires 2;

[0046] c. The woven membrane sheet is rolled up radially with a hollow fiber membrane 1 as the starting point. While rolling up, a sealant layer 6 is applied to both sides of the membrane sheet to obtain a hollow fiber membrane bundle semi-finished product. The bends at both ends of the semi-finished product are then cut off to obtain a hollow fiber membrane bundle B.

[0047] Example 3

[0048] Both ends of the hollow fiber membrane 1 are open, and the diameter of the hollow fiber membrane 1 is 0.35mm. A braided wire interlacing point 3 is provided at the connection of the braided wires 2 between the hollow fiber membranes 1, and the material of the braided wires 2 is polyester. The diameter of the braided wire 2 is 0.08mm, and the diameter of the limit wire 4 is 0.08mm. The limit wire 4 is made of the same material as the braided wire 2. The distance between adjacent hollow fiber membranes 1 is 0.1mm. The distance between adjacent braided wires 2 is 3mm, and a limit wire 4 is set every 3 hollow fiber membranes. The weaving method is interlacing.

[0049] The method for preparing a hollow fiber membrane bundle comprises the following steps:

[0050] a. The hollow fiber membrane 1 is set to be "S-shaped" reciprocatingly, and when it reaches one end, it is fixed by the clamp 5, and then the hollow fiber membrane 1 is pulled back, and so on;

[0051] b. In the radial direction of the hollow fiber membrane 1, a braided wire 2 is provided, and the hollow fiber membrane 1 is woven into a membrane by the braided wire 2, and a limit wire 4 is provided between adjacent braided wires 2;

[0052] c. The woven membrane is rolled up radially with a hollow fiber membrane 1 as the starting point. While rolling up, a sealant layer 6 is applied to both sides of the membrane to obtain a hollow fiber membrane bundle semi-finished product. The bends at both ends of the semi-finished product are then cut off to obtain a hollow fiber membrane bundle C.

[0053] Application Example 1

[0054] The hollow fiber membrane bundle is used for the hollow fiber membrane assembly. The length of the hollow fiber membrane assembly is 1.3m. A shell is provided on the outside of the hollow fiber membrane assembly. The hollow fiber membrane bundle is provided in the shell. A water inlet 7 and a water outlet 9 are provided at both ends of the shell. A vacuum port 8 is provided on the shell, and the vacuum port 8 is located between two sealant layers 6.

[0055] Boiler water (deionized water, water inlet pressure 0.5 MPa, vacuum degree 55 Torr) at 50°C was passed into the hollow fiber membrane module for a deoxygenation test.

[0056] Application Comparative Example 1

[0057] A hollow fiber membrane bundle (there is no physical interval between the hollow fiber membranes, and in the initial stage, the distance between adjacent hollow fiber membranes 1 is 0.15 mm) is placed in a high-pressure resistant metal shell, and 50°C boiler water (deionized water, water inlet pressure 0.5 MPa, vacuum degree 55 Torr) is passed into the hollow fiber membrane bundle for a deoxygenation test.

[0058] The test data of Application Example 1 and Application Comparative Example 1 are shown in Table 1.

[0059] Table 1 Test data of application example 1 and application comparative example 1

[0060]

[0061] By comparing the test data of Application Example 1 with that of Comparative Example 1, it can be seen that the hollow fiber membrane bundle prepared by the present invention still maintains a relatively high deoxygenation efficiency after 120 hours of operation, with an oxygen removal rate of up to 99%.

Claims

1. A hollow fiber membrane bundle, characterized in that: The hollow fiber membrane (1) comprises a braided wire (2) radially provided on the hollow fiber membrane (1) for fixing the distance between the fiber membranes, a braided wire interlacing point (3) is provided at the connection of the braided wires (2) between the hollow fiber membranes (1), and a limiting wire (4) is provided between the braided wires (2), the limiting wire (4) is parallel to the hollow fiber membrane (1), and the hollow fiber membrane (1) fixed by the braided wires (2) and the limiting wires (4) is rolled up in a radial direction with one hollow fiber membrane (1) as the starting point, thereby obtaining a hollow fiber membrane bundle; The diameter of the braided wire (2) is 0.08-0.12 mm, the diameter of the limit wire (4) is 0.08-0.12 mm, the limit wire (4) and the braided wire (2) are made of the same material, and the distance between adjacent hollow fiber membranes (1) is 0.1-0.2 mm; In the hollow fiber membrane bundle, the distance between adjacent braided wires (2) is 3-5 mm, and a limit line (4) is provided every 3-8 hollow fiber membranes; The method for preparing the hollow fiber membrane bundle comprises the following steps: a. The hollow fiber membrane (1) is set in an "S-shaped" reciprocating manner. When it reaches one end, it is fixed by a clamp (5), and then the hollow fiber membrane (1) is pulled back, and so on; b. In the radial direction of the hollow fiber membrane (1), a braiding wire (2) is provided, the hollow fiber membrane (1) is woven into a membrane sheet by the braiding wire (2), and a limiting wire (4) is provided between adjacent braiding wires (2); c. The woven membrane is rolled up radially with a hollow fiber membrane (1) as the starting point. While rolling up, a sealant layer (6) is applied to both sides of the membrane to obtain a hollow fiber membrane bundle semi-finished product. The bent parts at both ends of the semi-finished product are then cut off to obtain a hollow fiber membrane bundle; The hollow fiber membrane bundle is used in a hollow fiber membrane assembly. A shell is provided on the outside of the hollow fiber membrane assembly, and a hollow fiber membrane bundle is provided inside the shell. A water inlet (7) and a water outlet (9) are provided at both ends of the shell. A vacuum port (8) is provided on the shell, and the vacuum port (8) is located between two sealing rubber layers (6). The length of the hollow fiber membrane assembly is 1-1.5 m. The hollow fiber membrane bundle is used for deionizing water and removing oxygen.

2. The hollow fiber membrane bundle according to claim 1, characterized in that: Both ends of the hollow fiber membrane (1) are open, and the diameter of the hollow fiber membrane (1) is 0.35-0.40 mm.

3. The hollow fiber membrane bundle according to claim 1, characterized in that: The material of the braided wire (2) is one of polyester or nylon.

4. The hollow fiber membrane bundle according to claim 1, characterized in that: In the hollow fiber membrane bundle, the weaving method is one of crochet or interweaving.

5. The hollow fiber membrane bundle according to claim 1, characterized in that: Used in chemical, pharmaceutical and food fields.

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