A nanofiltration membrane filtration device

Abstract

This invention belongs to the field of nanofiltration membrane filtration technology, and more particularly to a nanofiltration membrane filtration device, including a cleaning tank, a pipeline assembly installed on the cleaning tank, a booster pump installed on the pipeline assembly, a membrane module installed on one side of the booster pump, and a feed pump installed on one side of the membrane module. Through the coordinated use of a controller, membrane module, booster pump, feed pump, heat exchanger, sensor, pressure gauge, and pressure regulating valve, this invention enables the feed liquid to flow at high speed across the surface of the membrane module. Under pressure, the feed liquid undergoes molecular-level separation, thereby forming a clear liquid and a concentrated liquid. The controller can monitor and adjust the pressure in real time. Furthermore, when the membrane is fouled, material flushing, chemical cleaning, and chemical rinsing can thoroughly flush the entire device, thereby preventing increased fouling or damage to the membrane module, maintaining the membrane's performance, and eliminating the need for manual cleaning, thus improving cleaning efficiency.

Description

Technical Field

[0001] This utility model relates to the field of nanofiltration membrane filtration technology, specifically to a nanofiltration membrane filtration device. Background Technology

[0002] Membrane filtration technology is widely used for the separation, concentration, and purification of liquid solutions. Nanofiltration is a pressure-driven membrane process that operates between reverse osmosis and ultrafiltration, capable of separating molecules of different sizes and charges.

[0003] Traditional nanofiltration equipment typically requires significant human intervention for operation, monitoring, and cleaning. The lack of integrated and automated control systems can lead to inconsistent operation, increased risk of membrane fouling or damage, and substantial maintenance downtime. Furthermore, the cleaning process in many existing systems is often performed manually, which can be very time-consuming, inefficient, and inconsistent, resulting in a decline in membrane performance over time. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a nanofiltration membrane filtration device that solves the problem that current nanofiltration devices typically require a large amount of manual intervention for operation, monitoring, and cleaning. The lack of an integrated and automated control system may lead to inconsistent operation, increased risk of membrane fouling or damage, and significant maintenance downtime. Furthermore, the cleaning process in many existing devices is usually performed manually, which can be very time-consuming, inefficient, and may not be performed consistently, resulting in a decline in membrane performance over time.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a nanofiltration membrane filtration device, comprising a cleaning tank, a pipeline assembly installed on the cleaning tank, a booster pump installed on the pipeline assembly, a membrane module installed on one side of the booster pump, a feed pump installed on one side of the membrane module, a controller installed on one side of the feed pump, a heat exchanger installed on one side of the controller, the heat exchanger being connected to the pipeline assembly, and a pressure sensor, a pressure gauge, and a pressure regulating valve respectively installed on the pipeline assembly.

[0006] As a preferred embodiment of this utility model, the pipeline assembly includes a clear liquid pipeline and a concentrated liquid pipeline, with one end of the clear liquid pipeline and the concentrated liquid pipeline respectively installed on both sides of the upper surface of the cleaning tank.

[0007] As a preferred embodiment of this utility model, a clear liquid external interface is installed on the upper part of the outer wall of the clear liquid pipeline, and a clear liquid flow meter is installed on the middle part of the outer wall of the clear liquid pipeline.

[0008] As a preferred embodiment of this utility model, a clear liquid sampling valve is installed on the lower part of the outer wall of the clear liquid pipeline, and a clear liquid drain port is installed on the lower part of the outer wall of the clear liquid pipeline.

[0009] As a preferred embodiment of this utility model, a concentrated liquid external interface is installed on the upper part of the outer wall of the concentrated liquid pipeline, and a concentrated liquid flow meter is installed on the middle part of the outer wall of the concentrated liquid pipeline.

[0010] As a preferred embodiment of this utility model, a concentrated liquid sampling valve is installed on the lower part of the outer wall of the concentrated liquid pipeline, and a concentrated liquid vent is installed on the lower part of the outer wall of the concentrated liquid pipeline.

[0011] Compared with the prior art, the present invention provides a nanofiltration membrane filtration device, which has the following beneficial effects: This nanofiltration membrane filtration equipment, through the coordinated use of a controller, membrane module, booster pump, feed pump, heat exchanger, sensor, pressure gauge, and pressure regulating valve, enables the feed liquid to flow at high speed across the membrane module surface. Under pressure, the feed liquid undergoes molecular-level separation, thereby forming clear liquid and concentrated liquid respectively. The controller can monitor and adjust the pressure in real time. At the same time, when the membrane is fouled, the entire equipment can be thoroughly flushed through material washing, chemical cleaning, and chemical rinsing, thereby avoiding increased fouling or damage to the membrane module, ensuring that the membrane performance does not decline, and eliminating the need for manual cleaning, thus improving cleaning efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the present invention.

[0013] In the diagram: 1. Cleaning tank; 2. Piping assembly; 201. Clarified liquid pipeline; 202. Concentrated liquid pipeline; 3. Booster pump; 4. Membrane module; 5. Feed pump; 6. Controller; 7. Heat exchanger; 8. Pressure sensor; 9. Pressure gauge; 10. Pressure regulating valve; 11. Concentrated liquid drain port; 12. Clarified liquid external interface; 13. Concentrated liquid external interface; 14. Clarified liquid flow meter; 15. Concentrated liquid flow meter; 16. Clarified liquid sampling valve; 17. Concentrated liquid sampling valve; 18. Clarified liquid drain port. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Example 1 Please see Figure 1In this embodiment: a nanofiltration membrane filtration device includes a cleaning tank 1, a pipeline assembly 2 installed on the cleaning tank 1, a booster pump 3 installed on the pipeline assembly 2, a membrane module 4 installed on one side of the booster pump 3, a feed pump 5 installed on one side of the membrane module 4, a controller 6 installed on one side of the feed pump 5, a heat exchanger 7 installed on one side of the controller 6, the heat exchanger 7 being connected to the pipeline assembly 2, and a pressure sensor 8, a pressure gauge 9, and a pressure regulating valve 10 respectively installed on the pipeline assembly 2; In this embodiment, the controller 6 sets key parameters such as filtration pressure and temperature. Then, the liquid to be treated is introduced into the equipment. The operator starts the booster pump 3 and the feed pump 5. After the circulation pump 3 starts, it begins to pressurize the liquid and drive it to circulate in the filtration loop. The liquid flows at high speed across the surface of the membrane module 4 in a "cross-flow filtration" manner. Under pressure, small molecules smaller than the nanofiltration membrane pore size penetrate the membrane layer, forming a clear liquid, which is collected. Large molecules larger than the membrane pore size are retained in the main fluid, forming a concentrated liquid. The concentrated liquid continues to circulate in the loop. As the concentration increases, controller 6 monitors the equipment pressure in real time via pressure sensor 8. If the pressure deviates from the operator-set target value, controller 6 automatically adjusts the opening of electric regulating valve 10 to quickly stabilize the pressure at the set value. When the temperature sensor detects that the liquid temperature is too high, controller 6 can introduce external cooling medium through heat exchanger 7 to cool the circulating concentrate, ensuring the liquid operates within the set safe temperature range. Throughout the filtration process, controller 6 monitors pressure, temperature, and the liquid level in cleaning tank 1. If excessively high / low pressure, excessive temperature, or abnormal liquid level occurs, the controller will take action. In cases such as these situations, controller 6 will immediately trigger an audible and visual alarm. In extreme cases, such as when pressure or temperature exceeds the limit, controller 6 will execute a preset protection program, automatically shutting down booster pump 3 to ensure equipment and personnel safety. When booster pump 3 stops, regulating valve 10 will automatically open fully to prevent pressure surges during the next startup. When a filtration task is completed or membrane flux decreases due to fouling, the pressure parameter of regulating valve 10 will be set to 0, all valves will be closed, purified water will be added to cleaning tank 1, and feed pump 6 and booster pump 3 will be started to begin equipment flushing. After flushing is complete, the flushing solution will be discharged. After the material is rinsed, a pre-prepared chemical cleaning solution is pumped into the cleaning tank 1. The chemical cleaning solution is generally alkaline water with a pH of about 10.5-11. The cleaning is carried out at a temperature of less than 50°C. The pressure parameter of the pressure regulating valve 10 is set to 0, and the membrane surface is circulated and rinsed. Then, the pressure parameter of the pressure regulating valve 10 is gradually increased until the permeate has a sufficient flow rate to clean the contaminants clogging the membrane pores of the membrane module 4. After the chemical cleaning is completed, the entire loop is thoroughly rinsed with a large amount of purified water until the pH value of the discharged water becomes neutral to ensure that there is no chemical cleaning agent residue.

[0016] Furthermore, the pipeline assembly 2 includes a clear liquid pipeline 201 and a concentrated liquid pipeline 202, with one end of the clear liquid pipeline 201 and the concentrated liquid pipeline 202 respectively installed on both sides of the upper surface of the cleaning tank 1; a clear liquid external interface 12 is installed on the upper part of the outer wall of the clear liquid pipeline 201, and a clear liquid flow meter 14 is installed in the middle part of the outer wall of the clear liquid pipeline 201; a clear liquid sampling valve 16 is installed in the lower middle part of the outer wall of the clear liquid pipeline 201, and a clear liquid drain port 18 is installed in the lower part of the outer wall of the clear liquid pipeline 201; a concentrated liquid external interface 13 is installed on the upper part of the outer wall of the concentrated liquid pipeline 202, and a concentrated liquid flow meter 15 is installed in the middle part of the outer wall of the concentrated liquid pipeline 202; a concentrated liquid sampling valve 17 is installed in the lower middle part of the outer wall of the concentrated liquid pipeline 202, and a concentrated liquid drain port 11 is installed in the lower part of the outer wall of the concentrated liquid pipeline 202.

[0017] The working principle and usage process of this utility model are as follows: The controller 6 sets key parameters such as filtration pressure and temperature. Then, the liquid to be treated is introduced into the equipment. The operator starts the booster pump 3 and the feed pump 5. After the circulation pump 3 starts, it begins to pressurize the liquid and drive it to circulate in the filtration loop. The liquid flows at high speed across the surface of the membrane module 4 in a "cross-flow filtration" manner. Under pressure, small molecules smaller than the nanofiltration membrane pore size penetrate the membrane layer, forming a clear liquid, which is collected. Large molecules larger than the membrane pore size are retained in the main fluid, forming a concentrated liquid. The concentrated liquid continues to be collected. The solution circulates in the loop, continuously increasing in concentration. Controller 6 monitors the equipment pressure in real time via pressure sensor 8. If the pressure deviates from the operator-set target value, controller 6 automatically adjusts the opening of electric regulating valve 10 to quickly stabilize the pressure at the set value. When the temperature sensor detects that the liquid temperature is too high, controller 6 can introduce external cooling medium through heat exchanger 7 to cool the circulating concentrate, ensuring the liquid operates within the set safe temperature range. Throughout the filtration process, controller 6 monitors pressure, temperature, and the liquid level in cleaning tank 1. If excessively high / low pressure or excessively high / low temperature occurs, the controller will take action. In case of abnormal liquid levels or other situations, controller 6 will immediately trigger an audible and visual alarm. In extreme cases, such as when pressure or temperature exceeds the limit, controller 6 will execute a preset protection program, automatically shutting down booster pump 3 to ensure equipment and personnel safety. When booster pump 3 stops, regulating valve 10 will automatically open fully to prevent pressure surges during the next startup. When a filtration task is completed or membrane flux decreases due to fouling, the pressure parameter of regulating valve 10 is set to 0, all valves are closed, purified water is added to cleaning tank 1, and feed pump 6 and booster pump 3 are started to begin equipment flushing. After flushing, the flushing solution is... After the material is discharged and rinsed, a pre-prepared chemical cleaning solution is pumped into the cleaning tank 1. The chemical cleaning solution is generally alkaline water with a pH of about 10.5-11, and the cleaning is carried out at a temperature of less than 50°C. The pressure parameter of the pressure regulating valve 10 is set to 0, and the membrane surface is circulated and rinsed. Then, the pressure parameter of the pressure regulating valve 10 is gradually increased until the permeate has a sufficient flow rate to clean the contaminants clogging the membrane pores of the membrane module 4. After the chemical cleaning is completed, the entire loop is thoroughly rinsed with a large amount of purified water until the pH value of the discharged water becomes neutral to ensure that there is no chemical cleaning agent residue.

[0018] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A nanofiltration membrane filtration device, comprising a cleaning tank (1), characterized in that: The cleaning tank (1) is equipped with a pipeline assembly (2), a booster pump (3) is installed on the pipeline assembly (2), a membrane module (4) is installed on one side of the booster pump (3), a feed pump (5) is installed on one side of the membrane module (4), a controller (6) is provided on one side of the feed pump (5), a heat exchanger (7) is installed on one side of the controller (6), the heat exchanger (7) is connected to the pipeline assembly (2), and a pressure sensor (8), a pressure gauge (9) and a pressure regulating valve (10) are respectively installed on the pipeline assembly (2).

2. The nanofiltration membrane filtration device according to claim 1, characterized in that: The pipeline assembly (2) includes a clear liquid pipeline (201) and a concentrated liquid pipeline (202), with one end of the clear liquid pipeline (201) and the concentrated liquid pipeline (202) respectively installed on both sides of the upper surface of the cleaning tank (1).

3. The nanofiltration membrane filtration device according to claim 2, characterized in that: A clear liquid external interface (12) is installed on the upper part of the outer wall of the clear liquid pipe (201), and a clear liquid flow meter (14) is installed on the middle part of the outer wall of the clear liquid pipe (201).

4. The nanofiltration membrane filtration device according to claim 3, characterized in that: A liquid sampling valve (16) is installed on the lower part of the outer wall of the liquid pipe (201), and a liquid drain port (18) is installed on the lower part of the outer wall of the liquid pipe (201).

5. A nanofiltration membrane filtration device according to claim 2, characterized in that: A concentrated liquid external interface (13) is installed on the upper part of the outer wall of the concentrated liquid pipeline (202), and a concentrated liquid flow meter (15) is installed on the middle part of the outer wall of the concentrated liquid pipeline (202).

6. A nanofiltration membrane filtration device according to claim 5, characterized in that: A concentrated liquid sampling valve (17) is installed on the lower part of the outer wall of the concentrated liquid pipeline (202), and a concentrated liquid drain port (11) is installed on the lower part of the outer wall of the concentrated liquid pipeline (202).

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