Membrane separation system

Abstract

The utility model discloses a membrane separation system, including the storage tank output, emulsion pipeline and membrane separator, the storage tank output is connected the membrane separator through emulsion pipeline, the storage tank output still is connected through the backwater pipeline and sends water pipeline, and the circulating pump is installed on the water supply pipeline, and the cleaning fluid of circulating pump output is sent from the membrane separator bottom and is washed back, this membrane separation shutdown control system, utilize nitrogen to push the emulsion in the pipeline inside to the temporary storage tank and carry out temperature control preservation, through the valve switching pipeline, and then inject clean water and nitrogen cycle back cleaning, under the action of venturi, will cleaning fluid and nitrogen fusion, hit into the membrane separator with the help of the multiple effect of air bubble and enhance cleaning power, improve cleaning effect, reduce emulsion pollution.

Description

Technical Field

[0001] This utility model relates to the technical field of dairy product production equipment, specifically a shutdown control system for a membrane separator used in dairy product production. Background Technology

[0002] A membrane separator is a device that uses a special semi-permeable membrane to selectively separate different components in dairy products. Semi-permeable membranes have different pore sizes or specific chemical properties, allowing certain molecules or particles to pass through while blocking others.

[0003] In dairy processing, membrane separation technologies (such as ultrafiltration, microfiltration, and reverse osmosis) are widely used in whey protein separation, milk concentration, and microbial removal. However, during operation, membrane fouling can occur due to protein deposition, fat adsorption, mineral precipitation, and microbial film formation, resulting in decreased flux, reduced separation efficiency, and even shortened membrane life. Therefore, it is necessary to shut down the machine and stop production. Water is then forced to flow backward through the membrane using reverse pressure (below the membrane's tolerance pressure) to "push out" the contaminants clogging the pores. This method is commonly used for microfiltration and ultrafiltration membranes. Due to the density of reverse osmosis membranes, backwashing requires strict pressure control to avoid membrane damage. The cleaning time is long, and the cleaning effect is generally poor. Furthermore, the emulsion inside the pipeline cannot be completely drained during shutdown and remains stored in the pipeline. The pipeline structure is simple and prone to deterioration. When the pipeline is circulated during production, it will contaminate the fresh emulsion. Therefore, technical improvements are needed for existing technologies. Utility Model Content

[0004] The purpose of this invention is to provide a membrane separation system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: The membrane separation system includes a storage tank output end, an emulsion pipeline, and a membrane separator. The storage tank output end is connected to the membrane separator through the emulsion pipeline. The storage tank output end is also connected to a water supply pipeline through a return water pipeline. A circulation pump is installed on the water supply pipeline. The cleaning solution output by the circulation pump is sent from the bottom of the membrane separator for backwashing.

[0006] As a further embodiment of this utility model: a Venturi tube is provided between the circulating pump and the membrane separator. The cleaning fluid enters through the inlet section of the Venturi tube, passes through the contraction section and the throat, and is output from the diffusion section to the membrane separator. The throat of the Venturi tube is connected to a nitrogen delivery pipeline.

[0007] As a further embodiment of this utility model: a buffer tank is connected between the return water pipeline and the supply water pipeline, and a nitrogen recovery pipeline a is connected to the top of the buffer tank. The end of the nitrogen delivery pipeline away from the venturi tube is connected to a gas tank, and a nitrogen pipeline a is connected to the gas tank. The nitrogen recovery pipeline a is connected to the nitrogen pipeline a, and a gas pump is installed on the nitrogen pipeline a.

[0008] As a further improvement of this utility model: a clean water pipeline and a nitrogen pipeline b are also installed on the return water pipeline. The clean water pipeline and the nitrogen pipeline b are connected to the return water pipeline through a three-way valve. A valve is installed between the return water pipeline and the buffer tank for control.

[0009] As a further embodiment of this utility model: a temporary storage tank is connected in parallel to the emulsion pipeline via a temporary storage pipeline. A valve is installed at the bottom of the temporary storage tank for control, and a nitrogen recovery pipeline b is provided at the top of the temporary storage tank, which is connected to the nitrogen pipeline a.

[0010] As a further embodiment of this utility model: the bottom of the membrane separator is connected to a product pipeline, the output end of the product pipeline is connected to the separation tank, the top of the separation tank is provided with a nitrogen recovery line c, and the bottom of the separation tank is provided with a product output line.

[0011] As a further improvement of this utility model: the bottom of the membrane separator is also connected to a concentrate output line, and valves are provided to control the output ends of the product line, the concentrate output line, the venturi tube, and the membrane separator.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This membrane separation system uses nitrogen to push the emulsion inside the pipeline into a temporary storage tank for temperature-controlled preservation. By switching the pipeline through valves, clean water and nitrogen are injected for backwashing. Under the action of the venturi tube, the cleaning fluid and nitrogen are mixed and injected into the membrane separator. The multiple effects of the bubbles enhance the cleaning power, improve the cleaning effect, and reduce emulsion contamination. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a membrane separation system.

[0014] In the diagram: 1. Storage tank output end; 2. Emulsion pipeline; 3. Membrane separator; 4. Clean water pipeline; 5. Nitrogen pipeline b; 6. Buffer tank; 7. Temporary storage tank; 8. Nitrogen recovery line c; 9. Product output line; 10. Return water pipeline; 11. Water delivery pipeline; 12. Circulation pump; 13. Venturi tube; 14. Nitrogen delivery pipeline; 15. Gas tank; 16. Gas pump; 17. Nitrogen recovery pipeline a; 18. Nitrogen pipeline a; 19. Product pipeline; 20. Separator tank; 21. Temporary storage pipeline; 22. Nitrogen recovery pipeline b. Detailed Implementation

[0015] Please see Figure 1In this embodiment of the present invention, the membrane separation system includes a storage tank output end 1, an emulsion pipeline 2, and a membrane separator 3. The storage tank output end 1 is connected to the membrane separator 3 through the emulsion pipeline 2. The storage tank output end 1 is also connected to a water supply pipeline 11 through a return water pipeline 10. A circulation pump 12 is installed on the water supply pipeline 11. The cleaning liquid output by the circulation pump 12 is sent from the bottom of the membrane separator 3 for backwashing. Under the action of the circulation pump 12, the water supply pipeline 11 can clean the emulsion pipeline 2 as well, reducing bacterial growth and scaling inside the pipeline, thus preventing emulsion contamination and ensuring food safety.

[0016] In a preferred embodiment, a Venturi tube 13 is provided between the circulating pump 12 and the membrane separator 3. The cleaning solution enters through the inlet section of the Venturi tube 13, passes through the contraction section and throat, and is output from the diffusion section to the membrane separator 3. The throat of the Venturi tube 13 is connected to a nitrogen delivery line 14. During the circulation process, nitrogen gas is injected into the cleaning solution through the Venturi tube 13. Under the action of the Venturi tube 13, the nitrogen gas mixes with the cleaning solution to form bubbles. The cleaning power is enhanced by the multiple effects of the bubbles. When the bubbles burst on the surface of the filter membrane or in the pores, they will... It generates localized high-pressure micro-jet and instantaneous impact force, which can penetrate deep pores and peel off stubborn pollutants such as attached biofilms and colloidal clusters. When bubbles rise or flow in water, they disrupt the water flow pattern, forming irregular turbulence, which enhances the "stirring" of the filter membrane surface and prevents pollutants from accumulating locally. The surface tension of the bubbles can adsorb some hydrophobic pollutants such as oils and organic matter, promoting their detachment from the membrane surface, thereby improving the cleaning effect in many ways. Nitrogen does not react with milk, so even if there is residual nitrogen in the milk, it will not affect the quality of the milk.

[0017] In a preferred embodiment, a buffer tank 6 is connected between the return water pipeline 10 and the supply water pipeline 11. The top of the buffer tank 6 is connected to a nitrogen recovery pipeline a17. The end of the nitrogen delivery pipeline 14 away from the venturi tube 13 is connected to a gas tank 15. A nitrogen pipeline a18 is connected to the gas tank 15. The nitrogen recovery pipeline a17 is connected to the nitrogen pipeline a18. A gas pump 16 is installed on the nitrogen pipeline a18. The buffer tank 6 serves to recover nitrogen and buffer the cleaning fluid. After the nitrogen enters the buffer tank 6, the cleaning fluid accumulates at the bottom of the buffer tank 6, and the nitrogen accumulates at the top of the buffer tank 6, achieving separation. The nitrogen is recovered and re-enters the nitrogen delivery pipeline 14 to mix with the cleaning fluid.

[0018] In a preferred embodiment, a clean water pipeline 4 and a nitrogen pipeline b5 are also installed on the return water pipeline 10. The clean water pipeline 4 and the nitrogen pipeline b5 are connected to the return water pipeline 10 via a three-way valve. A valve is installed between the return water pipeline 10 and the buffer tank 6 for control. A temporary storage tank 7 is connected in parallel to the emulsion pipeline 2 via a temporary storage pipeline 21. A valve is installed at the bottom of the temporary storage tank 7 for control. A nitrogen recovery pipeline b22 connected to the nitrogen pipeline a18 is provided at the top of the temporary storage tank 7. Through the valve control, nitrogen is first injected into the emulsion pipeline 2 to... The emulsion inside is pushed to the temporary storage tank 7, which is an insulated tank. The temperature of the insulated tank is adjusted to keep the emulsion fresh and prevent it from deteriorating. Nitrogen is injected until the emulsion is completely pushed out. Then the valve is switched, and nitrogen enters the membrane separator 3 to push the emulsion in the membrane separator 3 to the separation tank 20 until it is completely pushed out. Then the valve is switched again to cut off the nitrogen pipeline b5, the separation tank 20 and the temporary storage tank 7. Clean water is injected and distributed into the return water pipeline 10, the temporary storage pipeline 21 and the water supply pipeline 11. The circulation pump 12 is turned on to perform backwashing circulation.

[0019] In a preferred embodiment, the bottom of the membrane separator 3 is connected to a product line 19, the output end of the product line 19 is connected to the separation tank 20, the top of the separation tank 20 is provided with a nitrogen recovery line c8, and the bottom of the separation tank 20 is provided with a product output line 9, through which nitrogen and emulsion are separated.

[0020] In a preferred embodiment, the bottom of the membrane separator 3 is also connected to a concentrate output line. The product line 19, the concentrate output line, the output end of the venturi tube 13 and the output end of the membrane separator 3 are all equipped with valves for control. After a certain period of circulation, the cleaning liquid stops circulating and is switched to nitrogen gas. The cleaning liquid is pushed into the buffer tank 6 or pushed out from the concentrate output line, and then clean water is injected for rinsing.

[0021] It should be noted that all the above embodiments belong to the same utility model concept, and the descriptions of each embodiment have different focuses. Where the description in a particular embodiment is not detailed, please refer to the description in other embodiments.

[0022] The embodiments described above merely illustrate the implementation of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A membrane separation system, comprising a storage tank outlet (1), an emulsion line (2), and a membrane separator (3), wherein the storage tank outlet (1) is connected to the membrane separator (3) via the emulsion line (2), characterized in that, The tank output end (1) is also connected to the water supply pipeline (11) through the return water pipeline (10). A circulation pump (12) is installed on the water supply pipeline (11). The cleaning liquid output by the circulation pump (12) is sent from the bottom of the membrane separator (3) for backwashing. A venturi tube (13) is provided between the circulation pump (12) and the membrane separator (3). The cleaning liquid enters through the inlet section of the venturi tube (13), passes through the contraction section and the throat, and is output from the diffusion section to the membrane separator (3). The throat of the venturi tube (13) is connected to the nitrogen delivery pipeline (14).

2. The membrane separation system according to claim 1, characterized in that, The return water pipeline (10) is connected to the water supply pipeline (11) by a buffer tank (6). The top of the buffer tank (6) is connected to a nitrogen recovery pipeline a (17). The end of the nitrogen delivery pipeline (14) away from the venturi tube (13) is connected to a gas tank (15). A nitrogen pipeline a (18) is connected to the gas tank (15). The nitrogen recovery pipeline a (17) is connected to the nitrogen pipeline a (18). A gas pump (16) is installed on the nitrogen pipeline a (18).

3. The membrane separation system according to claim 1, characterized in that, The return water pipeline (10) is also equipped with a clean water pipeline (4) and a nitrogen pipeline b (5). The clean water pipeline (4) and the nitrogen pipeline b (5) are connected to the return water pipeline (10) through a three-way valve. A valve is installed between the return water pipeline (10) and the buffer tank (6) for control.

4. The membrane separation system according to claim 3, characterized in that, The emulsion pipeline (2) is connected in parallel with a temporary storage tank (7) via a temporary storage pipeline (21). A valve is installed at the bottom of the temporary storage tank (7) for control. A nitrogen recovery pipeline (22) connected to the nitrogen pipeline a (18) is provided at the top of the temporary storage tank (7).

5. The membrane separation system according to claim 3, characterized in that, The bottom of the membrane separator (3) is connected to a product line (19), the output end of the product line (19) is connected to the separation tank (20), the top of the separation tank (20) is provided with a nitrogen recovery line c (8), and the bottom of the separation tank (20) is provided with a product output line (9).

6. The membrane separation system according to claim 5, characterized in that, The bottom of the membrane separator (3) is also connected to a concentrate output line. The output ends of the product line (19), the concentrate output line, the venturi tube (13), and the membrane separator (3) are all equipped with valves for control.

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