Method for detecting and repairing broken filaments of hollow fiber air separation membrane module

Abstract

The invention relates to a broken yarn detection and repair method for a hollow fiber air separation membrane module. The method comprises the following steps: step 1, mounting a detection tool; step 2, detecting and marking a broken wire part of the air inlet epoxy sealing head; thirdly, a detection sight glass flange is detached, and an air inlet end cover is installed and sealed; the hollow fiber air separation membrane assembly is inverted, and a retentate gas outlet of the end face needing to be detected faces upwards; and 4, repeating the process, and then completing the broken wire detection and repair work of the gas outlet epoxy end socket. And step 5, putting the hollow fiber air separation membrane component subjected to the steps into a constant temperature control system, and completely curing the sealant such as epoxy resin coated on the damaged and broken wire part of the hollow fiber membrane after a certain time, thereby completing the broken wire detection and repair work of the hollow fiber air separation membrane component. According to the detection and repair method disclosed by the invention, the damage and breakage conditions of a certain filament in the membrane module can be detected, and the filament is repaired, so that the qualification rate of the membrane module is improved.

Description

Technical Field

[0001] The invention relates to the technical field of preparation of a hollow fiber gas separation membrane component, and in particular to a detection and repair method for a hollow fiber air separation membrane component. Background Art

[0002] Hollow fiber air separation membrane is composed of tens to hundreds of thousands of hollow fiber membranes (see Figure 1 ), the hollow fiber membrane is placed in a pressure-bearing shell. Compressed air enters the hollow fiber air separation membrane from the air inlet 1, and the oxygen, carbon dioxide, and water vapor therein selectively and preferentially permeate through the hollow fiber membrane wall. Fast gases such as water vapor, carbon dioxide, and oxygen permeate out from the permeate gas (oxygen-rich) port 2, while slow gases such as nitrogen and argon flow out from the residual gas (nitrogen) outlet 3 of the hollow fiber membrane.

[0003] The manufacturing process of existing hollow fiber air separation membrane modules is generally to first bundle the hollow fiber membrane fibers according to specifications, and then seal the two ends with adhesive (epoxy resin). Excess sealing materials on the end face are cut off, and the membrane is placed in the membrane shell, and then it becomes a finished membrane module after passing the inspection. In the production process of hollow fiber air separation membrane fibers, product defects will directly enter the membrane module preparation process along with the membrane fibers, directly affecting the performance of the membrane module product; in addition, the hollow fiber membrane fibers may be broken or damaged due to operational reasons during the preparation process of the membrane module, resulting in performance degradation and damage to the membrane module.

[0004] The general structure of hollow fiber air separation membrane module is as follows: Figure 1 As shown. The membrane assembly is composed of tens of thousands to hundreds of thousands of hollow fiber membrane filaments. The two ends of the hollow fiber membrane filament bundle are cast with epoxy resin. The hollow fiber membrane filament bundle is placed in a pressure-bearing shell, similar to a shell-and-tube heat exchanger. Compressed air enters the hollow fiber air separation membrane assembly from the air inlet (compressed air) port 1, and the oxygen, carbon dioxide, and water vapor therein selectively and preferentially permeate through the hollow fiber membrane wall. Fast gases such as water vapor, carbon dioxide, and oxygen permeate out from the permeate gas (oxygen-rich) port 2, while slow gases such as nitrogen and argon flow out from the residual gas (nitrogen) outlet 3 of the hollow fiber membrane. Due to the inevitable damage and breakage of the hollow fiber membrane filaments during the production of the hollow fiber membrane and the assembly of the membrane assembly, the separation performance of the air separation assembly is greatly reduced, resulting in defective products. Summary of the invention

[0005] The object of the present invention is to provide a method for detecting and repairing broken wires in a hollow fiber air separation membrane module, which can detect the damage and broken wire of a certain wire in the membrane module and repair the wire to improve the qualified rate of the membrane module.

[0006] To achieve the above object, the technical solution of the present invention is: a method for detecting and repairing broken wires in a hollow fiber air separation membrane module, the steps of which are:

[0007] Step 1: Install the inspection tooling

[0008] Remove the end cover of the air inlet of the end face to be inspected, install the inspection mirror flange, and expose the air inlet epoxy head of the end face to be inspected in the field of vision;

[0009] Step 2: Detect and mark the broken wire parts of the air inlet epoxy head

[0010] Seal the residual gas outlet, let clean low-pressure compressed air into the permeation port, and apply a leak-detecting agent on the air inlet epoxy head on the detection end face; control the pressure of the clean compressed air according to the permeability of the hollow fiber air separation membrane, and detect the broken wire parts of the air inlet epoxy head according to the difference in the gas flow rate permeated from the hollow fiber, and mark the damaged and broken wire parts of the air inlet epoxy seal hollow fiber membrane with a marker, and then remove the leak-detecting agent; apply epoxy resin sealant to the marked damaged and broken wire parts of the hollow fiber membrane on the air inlet epoxy head;

[0011] Step 3: Remove the inspection mirror flange, install the air inlet end cover and seal it; turn the hollow fiber air separation membrane module upside down, with the residual gas outlet of the end face to be inspected facing upward;

[0012] Step 4: Repeat the above process to complete the broken wire detection and repair work of the outlet epoxy head;

[0013] Step 5: Place the hollow fiber air separation membrane assembly that has completed the above steps into a constant temperature control system. After a certain period of time, the epoxy resin or other sealant coated on the damaged and broken wire parts of the hollow fiber membrane will be completely cured, completing the broken wire detection and repair work of the hollow fiber air separation membrane assembly.

[0014] Furthermore, in step one, before installing the testing tooling, the hollow fiber air separation membrane assembly to be tested is placed vertically, with the air inlet of the end face to be tested facing upward.

[0015] Furthermore, in step 2, clean low-pressure compressed air is introduced, and the air supply is stopped after a period of time to ensure that no leak-collecting agent remains.

[0016] Further, in step 2, the leak-collecting agent is a soap bubble leak-collecting agent.

[0017] The beneficial effects of the present invention are:

[0018] The present invention provides a method for detecting and repairing a hollow fiber membrane assembly, which can detect damage and broken wires of a certain wire in the membrane assembly, and repair the wire, thereby improving the qualified rate of the membrane assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of a hollow fiber air separation membrane module;

[0020] In the figure: air inlet (compressed air) port 1, permeate gas (oxygen-rich gas) port 2, residual gas (nitrogen) outlet 3, air inlet epoxy head 4, air epoxy head 5, hollow fiber membrane 6. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] See attached Figure 1 , an embodiment of the present invention provides a method for detecting and repairing broken wires of a hollow fiber air separation membrane, the steps of which are:

[0023] Step 1: Place the hollow fiber air separation membrane assembly to be tested vertically, with the end surface to be tested, such as the air inlet (compressed air) port 1 in the attached figure, facing upward;

[0024] Step 2: Remove the end face to be tested, such as the end cover of the air inlet (compressed air) port 1 in the attached figure, and install the testing tool (remove the end cover to cover the hollow fiber filament, and keep the fastening connection part, similar to the sight glass flange), which is to ensure that the air inlet epoxy head 4 does not cause abnormality due to reverse pressure. In this way, the end face to be tested (air inlet epoxy head 4) can be exposed to the field of vision.

[0025] Step 3: Connect the permeate gas (oxygen-rich gas) port 2 to a clean compressed air pipeline, and seal the retentate gas (nitrogen) outlet 3.

[0026] Step four, clean low-pressure compressed air is introduced into the permeate gas (oxygen-rich) port 2, and a pre-prepared leak detection agent (generally a soap bubble leak detection agent) is coated on the detection end face (such as the air intake epoxy head 4 in the attached figure). The pressure of the clean compressed air introduced is controlled according to the permeability (J value) of the hollow fiber air separation membrane. The gas permeated by a normal hollow fiber membrane is uniform, and the soap bubbles reacted are uniform. If the hollow fiber membrane is damaged or broken, the soap bubbles at the fiber membrane site on the air intake epoxy head 4 will be abnormal. According to the difference in the gas flow rate permeated by the hollow fiber, the damaged and broken parts of the hollow fiber membrane on the air intake epoxy head 4 can be marked by soap bubble detection.

[0027] Step 5: Use a marker pen or other tool to mark the damaged and broken parts of the hollow fiber membrane on the air inlet epoxy seal 4, and completely remove the leak-collecting agent. Continue to introduce clean low-pressure compressed air, and stop supplying air after a period of time to ensure that there is no residual leak-collecting agent. Apply epoxy resin or other sealant to the marked damaged and broken parts of the hollow fiber membrane on the air inlet epoxy seal 4.

[0028] Step 6. Remove the inspection tooling, install the end cover of the air inlet (compressed air) port 1 and seal it.

[0029] Step seven, invert the hollow fiber air separation membrane module, with the end surface to be inspected, such as the retentate gas (nitrogen) outlet 3 in the attached figure, facing upward.

[0030] Step eight, repeat the above work to complete the broken wire detection and repair work of the air outlet epoxy head 5.

[0031] Step nine, placing the hollow fiber air separation membrane assembly that has completed the above work into a constant temperature control system, allowing the epoxy resin or other sealant coated on the damaged and broken wire parts of the hollow fiber membrane to completely solidify after a suitable period of time, thereby completing the broken wire detection and repair work of the hollow fiber air separation membrane assembly.

[0032] The above embodiments are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A method for detecting and repairing broken wires in a hollow fiber air separation membrane module, characterized in that: The steps are: Step 1: Install the inspection tooling Remove the end cover of the air inlet of the end face to be inspected, install the inspection mirror flange, and expose the air inlet epoxy head of the end face to be inspected in the field of vision; Step 2: Detect and mark the broken wire parts of the air inlet epoxy head Seal the residual gas outlet, let clean low-pressure compressed air into the permeate port, and apply leak-detecting agent on the air inlet epoxy seal of the detection end face; Control the pressure of the clean compressed air according to the permeability of the hollow fiber air separation membrane, detect the broken wire parts of the air inlet epoxy seal according to the difference in the gas flow rate permeated from the hollow fiber, and mark the damaged and broken wire parts of the air inlet epoxy seal hollow fiber membrane with a marker, and then remove the leak-detecting agent; apply epoxy resin sealant to the marked damaged and broken wire parts of the hollow fiber membrane on the air inlet epoxy seal; Step 3: Remove the inspection mirror flange, install the air inlet end cover and seal it; turn the hollow fiber air separation membrane module upside down, with the residual gas outlet of the end face to be inspected facing upward; Step 4: Repeat the above process to complete the broken wire detection and repair work of the outlet epoxy head; Step 5: Place the hollow fiber air separation membrane assembly that has completed the above steps into a constant temperature control system. After a certain period of time, the epoxy resin or other sealant coated on the damaged and broken wire parts of the hollow fiber membrane will be completely cured, completing the broken wire detection and repair work of the hollow fiber air separation membrane assembly.

2. The method for detecting and repairing broken wires in a hollow fiber air separation membrane module according to claim 1, characterized in that: In step 1, before installing the testing tooling, the hollow fiber air separation membrane assembly to be tested is placed vertically with the air inlet of the end face to be tested facing upward.

3. The method for detecting and repairing broken wires in a hollow fiber air separation membrane module according to claim 1, characterized in that: In step 2, clean low-pressure compressed air is introduced, and the air supply is stopped after a period of time to ensure that no leak-collecting agent remains.

4. The method for detecting and repairing broken wires in a hollow fiber air separation membrane module according to claim 1, characterized in that: In step 2, the leak-collecting agent is a soap bubble leak-collecting agent.

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