Multidirectional coating system for hollow fiber composite membrane module

Abstract

The utility model relates to the technical field of hollow fiber composite membranes, and particularly discloses a multi-directional coating system for a hollow fiber composite membrane component. Comprising a membrane casting liquid container, a main inlet pipeline connected with the membrane casting liquid container, a positive pressure pipeline connected with the main inlet pipeline, a main outlet pipeline connected with the positive pressure pipeline, and a first input pipeline with two ends respectively connected with the main outlet pipeline and the top of a hollow fiber membrane component, the first output pipeline is connected with the bottom of the hollow fiber membrane module and is matched with the first input pipeline for use; the second input pipeline is respectively connected with the main inlet pipeline and the bottom of the hollow fiber membrane module; the second output pipeline is connected with the top of the hollow fiber membrane module and is matched with the second input pipeline for use; and the recoverer is respectively communicated with the first output pipeline and the second output pipeline. According to the utility model, multidirectional flow from top to bottom or from bottom to top can be realized, the multifunctionality of the coating device is met, the adaptive category of the hollow fiber membrane module is widened, and the coating mode is more flexible.

Description

Technical Field

[0001] The utility model relates to the technical field of hollow fiber composite membranes, and more specifically, to a multi-directional coating system for a hollow fiber composite membrane component. Background Art

[0002] Membrane separation technology is a technology that uses a separation membrane with selective permeability as its core. It screens different molecules or substances through the membrane, allowing certain components in the raw materials to selectively pass through the membrane, thereby achieving mixture separation and product concentration, purification, and purification. It has the characteristics of strong selectivity, simple operation process, wide application range, and low energy consumption. It can be widely used in gas separation fields such as carbon dioxide capture and helium separation.

[0003] A membrane assembly is a device in which a membrane of a certain area is assembled in a certain form. It is the core component of a membrane separation device. The membrane assembly consists of a separation membrane, a support body for fixing the membrane, a spacer, and a container. It is the main place where the membrane separation process is carried out. Hollow fiber membrane modules are composed of multiple fiber filaments with a hollow inner cavity that are cast and assembled. They have the characteristics of high packing density per unit volume, large filtration area, small footprint, and high mechanical strength. The membrane filaments are self-supporting and can easily meet the industrial application requirements of gas membrane separation technology. In order to enhance the separation performance of hollow fiber membrane modules, a layer of high-permeability polymer dense coating is usually coated on the surface of the hollow fiber membrane filaments to obtain a composite membrane. While maintaining the permeability of the original hollow fiber membrane, the resulting polymer dense coating has selective permeability, which can achieve selective separation of the target components.

[0004] The pore size of the hollow fiber membrane is small. After coating a single membrane filament, multiple membrane filaments are cast and assembled into an outer shell. The preparation process of the hollow fiber membrane assembly is relatively complicated and inefficient. There is also a lack of devices or equipment that can achieve large-scale overall coating of large-sized hollow fiber membrane assemblies, making it difficult to achieve large-scale production of hollow fiber composite membrane assemblies. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a multi-directional coating system for a hollow fiber composite membrane module, which can realize multi-directional flow from "top to bottom" or "bottom to top", meet the multifunctionality of the coating device, broaden the adaptability category of the hollow fiber membrane module, and make the coating method more flexible;

[0006] The solution adopted by the utility model to solve the technical problem is:

[0007] A multi-directional coating system for a hollow fiber composite membrane assembly comprises a casting liquid container, a main inlet pipeline connected to the casting liquid container, a positive pressure pipeline connected to the main inlet pipeline, a main outlet pipeline connected to the positive pressure pipeline, a first input pipeline whose two ends are respectively connected to the main outlet pipeline and the top of the hollow fiber membrane assembly, a first output pipeline connected to the bottom of the hollow fiber membrane assembly and used in conjunction with the first input pipeline, a second input pipeline connected to the main inlet pipeline and the bottom of the hollow fiber membrane assembly, a second output pipeline connected to the top of the hollow fiber membrane assembly and used in conjunction with the second input pipeline, and a recoverer respectively connected to the first output pipeline and the second output pipeline.

[0008] In some possible embodiments, a pump inlet valve and a solution pump are sequentially arranged on the positive pressure pipeline; the pump inlet valve is arranged between the solution pump and the main inlet pipeline; an upper liquid inlet valve is arranged on the first input pipeline; a first liquid recovery valve is arranged on the first output pipeline; a lower liquid inlet valve is arranged on the second input pipeline; and a second liquid recovery valve is arranged on the second output pipeline.

[0009] In some possible embodiments, it also includes a return liquid pipeline with its two ends connected to the recoverer and the positive pressure pipeline respectively, and a circulation pipeline with its two ends connected to the main outlet pipeline and the casting liquid container respectively; the connection point of the return liquid pipeline and the positive pressure pipeline is set between the pump inlet valve and the solution pump.

[0010] In some possible implementations, a loop liquid return valve is provided on the circulation pipeline; and a liquid return valve is provided on the liquid return pipeline.

[0011] In some possible implementations, the system further includes a vacuum pump connected to the recovery device, and a negative pressure pipeline with both ends connected to the main inlet pipeline and the main outlet pipeline.

[0012] In some possible implementations, a vacuum bypass valve is provided on the negative pressure pipeline.

[0013] In some possible embodiments, the top pipeline further includes one end connected to the top of the hollow fiber membrane assembly; the other end of the top pipeline is connected to the first input pipeline and the second output pipeline respectively; the end of the top pipeline away from the hollow fiber membrane assembly is externally connected to a vent valve.

[0014] In some possible embodiments, the system further includes a bottom pipeline having one end connected to the bottom of the hollow fiber membrane module and the other end connected to the first output pipeline and the second input pipeline, respectively.

[0015] In some possible implementations, a breathing valve is installed in the casting liquid container.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The utility model realizes the coating of the hollow fiber membrane assembly by effectively conveying the casting liquid "from top to bottom" or "from bottom to top" under positive pressure conditions through the cooperation of the main inlet pipeline, the positive pressure pipeline, the main outlet pipeline, the first input pipeline, the second input pipeline, the first output pipeline, the second output pipeline, and the hollow fiber membrane assembly;

[0018] The utility model effectively realizes the coating of the hollow fiber membrane assembly by transporting the casting liquid "from top to bottom" or "from bottom to top" under negative pressure conditions through the cooperation of the main inlet pipeline, the negative pressure pipeline, the main outlet pipeline, the first input pipeline, the second input pipeline, the first output pipeline, the second output pipeline, the vacuum pump, and the hollow fiber membrane assembly;

[0019] The utility model effectively realizes the recovery of the casting liquid through the coordination of the return liquid pipeline, the circulation pipeline and the positive pressure pipeline, and uses the existing solution pump as a drive, thereby improving the utilization rate of the casting liquid and saving the operating cost of the system;

[0020] The utility model can make the excess casting liquid in the hollow fiber membrane assembly enter the recovery device under the influence of gravity or vacuum by cooperating with the vent valve, the first liquid recovery valve, the solution pump or the vacuum pump, so as to realize the cleaning of the interior of the hollow fiber composite membrane assembly and the recovery of the solution after the coating is completed;

[0021] The utility model can balance the pressure change caused by the increase and decrease of the casting liquid in the casting liquid container through the breathing valve, thereby protecting the casting liquid container and reducing the evaporation loss of the casting liquid in the casting liquid container.

[0022] The utility model sets a solution pump and a vacuum pump, designs a solution positive / negative pressure and multi-directional drive transmission pipeline, and can select a suitable coating method according to different types of casting liquids and hollow fiber membrane components with different characteristic adaptability to achieve efficient and stable preparation of composite membranes, and the coating method is flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the connection relationship of the utility model;

[0024] Among them: 1-breathing valve, 2-casting liquid container, 3-loop return valve, 4-pump inlet valve, 5-solution pump, 6-vacuum bypass valve, 7-return valve, 8-upper liquid inlet valve, 9-vent valve, 10-hollow fiber membrane assembly, 11-lower liquid inlet valve, 12-first liquid recovery valve, 13-second liquid recovery valve, 14-recovery device, 15-vacuum pump, 20-main inlet pipeline, 30-positive pressure pipeline, 40-main outlet pipeline, 50-first input pipeline, 60-first output pipeline, 70-second input pipeline, 80-second output pipeline, 90-return pipeline, 100-circulation pipeline, 110-negative pressure pipeline, 120-top pipeline, 130-bottom pipeline. DETAILED DESCRIPTION

[0025] In this application, unless otherwise specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integration; they can refer to direct connections or indirect connections through an intermediary; they can refer to internal communication between two components or interactions between two components. The terms "first," "second," and similar terms mentioned in this application do not denote any order, quantity, or importance; they are simply used to distinguish between different components. Similarly, terms such as "a" or "an" do not indicate a quantitative limitation; rather, they indicate the presence of at least one. In the implementation of this application, "and / or" describes an association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. In the description of the embodiments of this application, unless otherwise specified, "plurality" means two or more. For example, "plurality" refers to two or more positioning posts. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0026] The utility model is described in detail below.

[0027] like Figure 1 As shown:

[0028] A multi-directional coating system for a hollow fiber composite membrane assembly includes a casting liquid container 2, a main inlet pipeline 20 connected to the casting liquid container 2, a positive pressure pipeline 30 connected to the main inlet pipeline 20, a negative pressure pipeline 110 connected to the main inlet pipeline 20, a main outlet pipeline 40 connected to the positive pressure pipeline 30 and the negative pressure pipeline 110, a first input pipeline 50 whose two ends are respectively connected to the main outlet pipeline 40 and the top of the hollow fiber membrane assembly 10, a first output pipeline 60 connected to the bottom of the hollow fiber membrane assembly 10 and used in conjunction with the first input pipeline 50, a second input pipeline 70 connected to the main inlet pipeline 20 and the bottom of the hollow fiber membrane assembly 10, a second output pipeline 80 connected to the top of the hollow fiber membrane assembly 10 and used in conjunction with the second input pipeline 70, and a recoverer 14 respectively connected to the first output pipeline 60 and the second output pipeline 80.

[0029] When coating the hollow fiber membrane assembly 10 under positive pressure, the hollow fiber membrane assembly 10 can be coated from top to bottom or from bottom to top.

[0030] When coating the hollow fiber membrane assembly 10 from top to bottom, the casting liquid enters the positive pressure line 30 through the main inlet line 20, enters the top of the hollow fiber membrane assembly 10 along the first input line 50, flows from top to bottom in the hollow fiber membrane assembly 10 to coat, and flows out from the first output line 60 provided at the bottom of the hollow fiber membrane assembly 10 to enter the recovery device 14; during this process, the second input line 70 and the second output line 80 are in a closed state;

[0031] When the hollow fiber membrane module 10 is coated "from bottom to top", the casting liquid enters the positive pressure pipeline 30 through the main inlet pipeline 20, enters the bottom of the hollow fiber membrane module 10 along the second input pipeline 70, flows from bottom to top in the hollow fiber membrane module 10 for coating, and flows out from the second output pipeline 80 provided at the top of the hollow fiber membrane module 10 and enters the recovery device 14; during this process, the first input pipeline 50 and the first output pipeline 60 are in a closed state;

[0032] In some possible embodiments, in order to effectively realize the coating of the hollow fiber membrane assembly 10 "from top to bottom" or "from bottom to top" under positive pressure conditions through the positive pressure pipeline 30; a pump inlet valve 4 and a solution pump 5 are sequentially arranged on the positive pressure pipeline 30; the pump inlet valve 4 is arranged between the solution pump 5 and the main inlet pipeline 20; an upper liquid inlet valve 8 is arranged on the first input pipeline 50; a first liquid recovery valve 12 is arranged on the first output pipeline 60; a lower liquid inlet valve 11 is arranged on the second input pipeline 70; and a second liquid recovery valve 13 is arranged on the second output pipeline 80.

[0033] Specifically, under positive pressure conditions, when coating the hollow fiber membrane assembly 10 from top to bottom:

[0034] Open the pump inlet valve 4 on the positive pressure pipeline 30, the solution pump 5, the upper liquid inlet valve 8 on the first input pipeline 50, and the first liquid recovery valve 12 on the first output pipeline 60. The casting liquid in the casting liquid container 2 can be driven by the solution pump 5 and pass through the main inlet pipeline 20, the positive pressure pipeline 30, and the main outlet pipeline 40 in sequence, and then enter the interior of the hollow fiber membrane component 10 from the top through the first input pipeline 50 provided with the upper liquid inlet valve 8, and realize "top-down" coating under positive pressure conditions (10-30 kPa, gauge pressure), and flow out through the first output pipeline 60 provided with the first liquid recovery valve 12 and connected to the bottom of the hollow fiber membrane component 10, and enter the recoverer 14 for recovery. During this process, the remaining valves are in a closed state.

[0035] Specifically, under positive pressure conditions, when coating the hollow fiber membrane assembly 10 from bottom to top:

[0036] Open the pump inlet valve 4, the solution pump 5, the lower liquid inlet valve 11, and the second liquid recovery valve 13 on the positive pressure pipeline 30. The casting liquid in the casting liquid container 2 can be driven by the solution pump 5 and pass through the main inlet pipeline 20, the positive pressure pipeline 30, the main outlet pipeline 40 in sequence, and then pass through the second input pipeline 70 provided with the lower liquid inlet valve 11, enter the interior of the hollow fiber membrane component 10 from the bottom and realize "from bottom to top" coating under positive pressure conditions (10~30kPa, gauge pressure) in the hollow fiber membrane component 10, and flow out through the second output pipeline 80 provided with the second liquid recovery valve 13 and connected to the top of the hollow fiber membrane component 10, and then enter the recoverer 14 for recovery. During this process, it and the valve are in a closed state.

[0037] In some possible embodiments, in order to effectively realize the recycling of the casting liquid in the recovery device 14: the multi-directional coating system of the hollow fiber composite membrane assembly also includes a return liquid pipeline 90 connected to the recovery device 14 and the positive pressure pipeline 30 at both ends, and a circulation pipeline 100 connected to the main outlet pipeline 40 and the casting liquid container 2 at both ends; the connection point between the return liquid pipeline 90 and the positive pressure pipeline 30 is set between the pump inlet valve 4 and the solution pump 5; a loop return liquid valve 3 is provided on the circulation pipeline 100; and a return liquid valve 7 is provided on the return liquid pipeline 90.

[0038] When recovering the casting liquid, open the loop return valve 3, the return valve 7, and the solution pump 5. The casting liquid in the recoverer 14 can be transported to the circulation pipeline 100 through the return pipeline 90 connected to the bottom of the recoverer 14 through the power of the solution pump 5, and returned to the casting liquid container 2 through the loop return valve 3 to be coated and reused.

[0039] In some possible embodiments, in order to effectively achieve "from top to bottom" or "from bottom to top" coating of the hollow fiber membrane assembly 10 under negative pressure conditions; the negative pressure pipeline 110 is connected to the recoverer 14 vacuum pump 15, and both ends are connected to the main inlet pipeline 20 and the main outlet pipeline 40 and are in parallel with the positive pressure pipeline 30; a vacuum bypass valve 6 is provided on the negative pressure pipeline 110.

[0040] Specifically, under negative pressure conditions, when coating the hollow fiber membrane assembly 10 from top to bottom:

[0041] Open the vacuum bypass valve 6, the upper liquid inlet valve 8 on the first input pipeline 50, the first liquid recovery valve 12 on the first output pipeline 60, and the vacuum pump 15 connected to the inside of the recoverer 14. At this time, the entire system is under negative pressure under the action of the vacuum pump 15. The casting liquid enters the main inlet pipeline 20, the negative pressure pipeline 110, and the main outlet pipeline 40 under negative pressure drive, and then passes through the first input pipeline 50 provided with the upper liquid inlet valve 8, enters the top of the hollow fiber membrane module 10, flows in the hollow fiber membrane module 10, and realizes "top-down" coating under negative pressure conditions. It is then recovered to the recoverer 14 through the first output pipeline 60 connected to the bottom of the hollow fiber membrane module 10 and provided with the first liquid recovery valve 12. During this process, it and the valve and solution pump 5 are in a closed state;

[0042] Specifically, under negative pressure conditions, when coating the hollow fiber membrane assembly 10 from bottom to top:

[0043] Open the vacuum bypass valve 6, the lower liquid inlet valve 11, the second liquid recovery valve 13 and the vacuum pump 15 to generate a negative pressure in the system (10-90 kPa, vacuum degree). Driven by the negative pressure, the casting liquid enters the main inlet pipeline 20, the negative pressure pipeline 110, and the main outlet pipeline 40, passes through the second input pipeline 70 provided with the lower liquid inlet valve 11, and enters from the bottom of the hollow fiber membrane assembly 10, realizing "from bottom to top" coating under negative pressure conditions, and is recovered to the recovery device 14 through the second output pipeline 80 provided with the second liquid recovery valve 13; during this process, the remaining valves and the solution pump 5 are in a closed state.

[0044] In some possible embodiments, in order to effectively achieve the communication between the hollow fiber membrane module 10 and the first input pipeline 50, the second input pipeline 70, the first output pipeline 60, and the second output pipeline 80; a top pipeline 120 having one end connected to the top of the hollow fiber membrane module 10 and a bottom pipeline 130 having one end connected to the bottom of the hollow fiber membrane module 10 are further included;

[0045] The other end of the top pipeline 120 is connected to the first input pipeline 50 and the second output pipeline 80 respectively; the end of the top pipeline 120 away from the hollow fiber membrane module 10 is externally connected to a vent valve 9; the first input pipeline 50, the second output pipeline 80, and the vent valve 9 are connected to the top pipeline 120 via a four-way joint; the provision of the vent valve 9 facilitates the emptying of excess coating liquid in the hollow fiber composite membrane module after coating is completed;

[0046] The utility model can effectively drive the casting liquid through the system pressure to completely infiltrate the hollow fiber membrane in the membrane assembly and maintain the coating in the hollow fiber membrane for 10 to 30 seconds;

[0047] After the coating is completed, open the drain valve 9 and the first liquid recovery valve 12, close the solution pump 5 or the vacuum pump 15, the upper liquid inlet valve 8, the lower liquid inlet valve 11, and the second liquid recovery valve 13, and the excess casting liquid in the hollow fiber membrane assembly 10 can enter the recovery device 14 under the drive of gravity or the opening of the vacuum pump 15, so as to realize the cleaning of the interior of the hollow fiber membrane assembly 10 and the recovery of the remaining solution; after the coating is completed, a hollow fiber composite membrane assembly with a high permeability selective layer thickness in the range of 100 to 200 nm can be obtained for subsequent processing and application.

[0048] In some possible implementations, a breathing valve 1 is installed in the casting liquid container 2;

[0049] Specifically, the bottom of the breathing valve 1 is not in contact with the casting liquid in the casting liquid container 2; when the membrane assembly is coated, the casting liquid in the casting liquid container 2 decreases, and a slight negative pressure is present in the casting liquid container; when the casting liquid is recycled, the solution in the casting liquid container 2 increases, and a slight positive pressure is present in the casting liquid container 2;

[0050] The setting of the breathing valve 1 can balance the pressure changes caused by the increase or decrease of the solution in the casting liquid container 2. Compared with the setting of the vent hole in the prior art, the setting of the breathing valve 1 can also reduce the evaporation loss of the casting liquid in the casting liquid container 2.

[0051] Example 1:

[0052] This embodiment mainly realizes the coating of the casting liquid from top to bottom in the hollow fiber membrane module 10 under positive pressure conditions:

[0053] When operating under positive pressure conditions, close the loop return valve 3, vacuum bypass valve 6, return liquid valve 7, vent valve 9, lower liquid inlet valve 11, second liquid recovery valve 13 and vacuum pump 15, open the pump inlet valve 4 and solution pump 5, upper liquid inlet valve 8 and first liquid recovery valve 12, and the casting liquid in the casting liquid container 2 can be driven by the solution pump 5, pass through the upper liquid inlet valve 8, enter the hollow fiber membrane assembly 10 to realize "from top to bottom" coating under positive pressure conditions (10~30kPa, gauge pressure), and enter the recovery device 14 through the first liquid recovery valve 12 for recovery.

[0054] Example 2:

[0055] This embodiment mainly realizes the coating of the casting liquid in the hollow fiber membrane module 10 from bottom to top under positive pressure conditions:

[0056] When operating under positive pressure conditions, close the loop return valve 3, vacuum bypass valve 6, return liquid valve 7, upper liquid inlet valve 8, vent valve 9, first liquid recovery valve 12, and vacuum pump 15, open the pump inlet valve 4 and solution pump 5, lower liquid inlet valve 11 and second liquid recovery valve 13, and the casting liquid in the casting liquid container 2 can be driven by the solution pump 5, pass through the lower liquid inlet valve 11, enter the hollow fiber membrane assembly 10 to realize "from bottom to top" coating under positive pressure conditions (10~30kPa, gauge pressure), and enter the recovery device 14 through the second liquid recovery valve 13 to realize recovery.

[0057] Example 3:

[0058] This embodiment mainly realizes that the casting liquid is coated "from top to bottom" in the hollow fiber membrane module 10 under negative pressure conditions:

[0059] When operating under negative pressure conditions, close the loop return valve 3, pump inlet valve 4, solution pump 5, return liquid valve 7, vent valve 9, lower liquid inlet valve 11, and second liquid recovery valve 13, and open the vacuum bypass valve 6, upper liquid inlet valve 8, first liquid recovery valve 12 and vacuum pump 15. The entire system generates vacuum negative pressure (10-90 kPa, vacuum degree). The casting liquid enters the pipeline under negative pressure drive, passes through the upper liquid inlet valve 8, and enters the hollow fiber membrane assembly 10 to realize "from top to bottom" coating under negative pressure conditions, and is recovered to the recovery device 14 through the first liquid recovery valve 12.

[0060] Example 3:

[0061] This embodiment mainly realizes that the casting liquid is coated "from bottom to top" in the hollow fiber membrane module 10 under negative pressure conditions:

[0062] When operating under negative pressure conditions, close the loop return valve 3, pump inlet valve 4, solution pump 5, return liquid valve 7, vent valve 9, upper liquid inlet valve 8 and first liquid recovery valve 12, open the vacuum bypass valve 6, lower liquid inlet valve 11, first liquid recovery valve 12 and vacuum pump 15, generate system negative pressure (10~90kPa, vacuum degree), and the casting liquid enters the pipeline under negative pressure drive, passes through the lower liquid inlet valve 11, and enters the hollow fiber membrane assembly 10 to realize "from bottom to top" coating under negative pressure conditions, and is recovered to the recovery device 14 through the second liquid recovery valve 13.

[0063] Example 5:

[0064] After coating is completed by any of the methods in Examples 1-4, the drain valve 9 and the first liquid recovery valve 12 are opened, the solution pump 5 or the vacuum pump 15, the upper liquid inlet valve 8, the lower liquid inlet valve 11, and the second liquid recovery valve 13 are closed, and the excess casting liquid in the hollow fiber membrane assembly 10 can enter the recovery device 14 under gravity or by turning on the vacuum pump 15, thereby achieving internal cleaning and solution recovery of the hollow fiber membrane assembly 10;

[0065] After coating is completed, a hollow fiber composite membrane component with a high permeability selective layer thickness in the range of 100 to 200 nm can be obtained for subsequent processing and application.

[0066] Example 6:

[0067] When the casting liquid in the recoverer 14 is recycled, the pump inlet valve 4, the vacuum bypass valve 6, the upper liquid inlet valve 8, the vent valve 9, the lower liquid inlet valve 11, the first liquid recovery valve 12, the second liquid recovery valve 13 and the vacuum pump 15 are closed; the loop liquid return valve 3 and the liquid return valve 7 are opened, and the casting liquid in the recoverer 14 can pass through the liquid return pipeline 90 provided at the bottom of the recoverer 14, and be powered by the solution pump 5 to the circulation pipeline 100, and return to the casting liquid container 2 through the loop liquid return valve 3 to be coated and reused again.

[0068] The present invention is not limited to the aforementioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A multi-directional coating system for a hollow fiber composite membrane module, characterized in that: The invention comprises a casting liquid container (2), a main inlet pipeline (20) connected to the casting liquid container (2), a positive pressure pipeline (30) connected to the main inlet pipeline (20), a main outlet pipeline (40) connected to the positive pressure pipeline (30), a first input pipeline (50) whose two ends are respectively connected to the main outlet pipeline (40) and the top of the hollow fiber membrane assembly (10), a first output pipeline (60) connected to the bottom of the hollow fiber membrane assembly (10) and used in conjunction with the first input pipeline (50), a second input pipeline (70) connected to the main inlet pipeline (20) and the bottom of the hollow fiber membrane assembly (10), a second output pipeline (80) connected to the top of the hollow fiber membrane assembly (10) and used in conjunction with the second input pipeline (70), and a recovery device (14) respectively connected to the first output pipeline (60) and the second output pipeline (80).

2. A multi-directional coating system for hollow fiber composite membrane modules according to claim 1, characterized in that: A pump inlet valve (4) and a solution pump (5) are sequentially arranged on the positive pressure pipeline (30); the pump inlet valve (4) is arranged between the solution pump (5) and the main inlet pipeline (20); an upper liquid inlet valve (8) is arranged on the first input pipeline (50); a first liquid recovery valve (12) is arranged on the first output pipeline (60); a lower liquid inlet valve (11) is arranged on the second input pipeline (70); and a second liquid recovery valve (13) is arranged on the second output pipeline (80).

3. A multi-directional coating system for hollow fiber composite membrane modules according to claim 2, characterized in that: It also includes a liquid return pipeline (90) whose two ends are respectively connected to the recovery device (14) and the positive pressure pipeline (30), and a circulation pipeline (100) whose two ends are respectively connected to the main outlet pipeline (40) and the casting liquid container (2); the connection point between the liquid return pipeline (90) and the positive pressure pipeline (30) is set between the pump inlet valve (4) and the solution pump (5).

4. A multi-directional coating system for hollow fiber composite membrane modules according to claim 3, characterized in that: A loop liquid return valve (3) is provided on the circulation pipeline (100); and a liquid return valve (7) is provided on the liquid return pipeline (90).

5. The multi-directional coating system for hollow fiber composite membrane modules according to claim 2, characterized in that: It also includes a vacuum pump (15) connected to the recovery device (14), and a negative pressure pipeline (110) with two ends connected to the main inlet pipeline (20) and the main outlet pipeline (40).

6. A multi-directional coating system for hollow fiber composite membrane modules according to claim 5, characterized in that: A vacuum bypass valve (6) is provided on the negative pressure pipeline (110).

7. The multi-directional coating system for hollow fiber composite membrane modules according to claim 1, characterized in that: It also includes a top pipeline (120) with one end connected to the top of the hollow fiber membrane assembly (10); the other end of the top pipeline (120) is connected to the first input pipeline (50) and the second output pipeline (80), respectively, and the end of the top pipeline (120) away from the hollow fiber membrane assembly (10) is externally connected to a vent valve (9).

8. A multi-directional coating system for hollow fiber composite membrane modules according to claim 7, characterized in that: It also includes a bottom pipeline (130) having one end in communication with the bottom of the hollow fiber membrane assembly (10) and the other end connected to the first output pipeline (60) and the second input pipeline (70), respectively.

9. The multi-directional coating system for hollow fiber composite membrane modules according to claim 1, characterized in that: A breathing valve (1) is installed in the casting liquid container (2).

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