Self-cleaning ultrafiltration system

Abstract

The utility model relates to the technical field of filtration, in particular to a self-cleaning ultrafiltration system which comprises a sterile filtration module, an ultrafiltration buffer module and an ultrafiltration module, and the sterile filtration module comprises a main pipeline; a production feed liquid transmission pipeline; an injection water conduit; a purified water pipeline; a liquid filter; the ultrafiltration buffer module comprises a first buffer tank; a first liquid inlet pipe; a second liquid inlet pipe; a liquid outlet pipe; the first return pipe is communicated with the bottom of the first buffer tank; a first cleaning water return pipe; the ultrafiltration module comprises an ultrafiltration column, and the ultrafiltration column is provided with an inlet end, a backflow end, an upper permeation end and a lower permeation end; a liquid inlet pump is mounted on the third liquid inlet pipe; the second return pipe is communicated with the first return pipe; the second cleaning water return pipe is communicated with the first cleaning water return pipe; the penetrating pipeline is communicated with the upper penetrating end; the circulating pipeline is communicated with the second return pipe; and the backflow discharge pipe is communicated with the second backflow pipe. The ultrafiltration column can be self-cleaned, and the effective working time of equipment is prolonged.

Description

Technical Field

[0001] This application relates to the field of filtration technology, and particularly to a self-cleaning ultrafiltration system. Background Art

[0002] As an advanced membrane separation process, ultrafiltration technology has been widely applied in the fields of water treatment, food processing, biotechnology, and medicine. However, existing self-cleaning ultrafiltration systems generally lack effective self-cleaning functions, which seriously restricts their long-term operating efficiency and economy. In traditional self-cleaning ultrafiltration systems, with the extension of usage time, organic matter, inorganic salts, and microorganisms inevitably accumulate on the membrane surface and pores, forming a contamination layer and scale that are difficult to remove. This contamination not only significantly reduces the membrane flux and sharply increases the energy consumption, but also greatly shortens the service life of the membrane module.

[0003] Currently, the commonly adopted cleaning methods in the industry mainly include regular manual backwashing and chemical cleaning. These methods not only require shutdown operations, affecting production continuity, but also have problems such as incomplete cleaning, complex operations, and large amounts of chemical agents used. More importantly, these passive cleaning methods cannot respond to membrane fouling in real time and often deal with it only after the system performance has significantly declined. This lag seriously affects the overall efficiency of the self-cleaning ultrafiltration system. In addition, frequent manual intervention and chemical cleaning also increase the operating cost, and at the same time, the use of chemical cleaning agents brings environmental pollution problems. The lack of a self-cleaning system also means that ultrafiltration equipment requires more professional maintenance, which not only increases the labor cost but also limits the application of ultrafiltration technology in some remote or areas lacking human resources. Summary of the Invention

[0004] This application aims to at least partly solve one of the above technical problems in the prior art. To this end, an embodiment of this application provides a self-cleaning ultrafiltration system, which can perform self-cleaning on the ultrafiltration buffer module and the ultrafiltration module, does not require manual removal of the corresponding equipment for cleaning, effectively improves the cleaning efficiency, reduces the equipment downtime, and increases the effective working time of the equipment.

[0005] A self-cleaning ultrafiltration system includes a sterile filtration module, an ultrafiltration buffer module, and an ultrafiltration module, wherein

[0006] The sterile filtration module includes

[0007] The main pipeline;

[0008] The production feed liquid transmission pipeline, and the production feed liquid transmission pipeline is connected to the main pipeline;

[0009] The injection water pipeline, and the injection water pipeline is connected to the main pipeline;

[0010] Purified water pipeline, the purified water pipeline is connected to the main pipeline;

[0011] Liquid filter, the liquid filter is arranged on the main pipeline;

[0012] The ultrafiltration buffer module includes

[0013] The first buffer tank, a spray ball is arranged at the inner top of the first buffer tank;

[0014] The first liquid inlet pipe, the first liquid inlet pipe is connected to the first buffer tank;

[0015] The second liquid inlet pipe, the second liquid inlet pipe is connected to the first buffer tank, and the second liquid inlet pipe is connected to the main pipeline;

[0016] The liquid outlet pipe, the liquid outlet pipe is connected to the bottom of the first buffer tank;

[0017] The first return pipe, one end of the first return pipe communicates with the bottom of the first buffer tank, and the other end is connected to the spray ball;

[0018] The lye preparation pipe, the lye preparation pipe is connected to the first buffer tank;

[0019] The first cleaning return pipe, the first cleaning return pipe is connected to the first return pipe through a first connecting pipe;

[0020] The ultrafiltration module includes

[0021] Ultrafiltration column, the ultrafiltration column has an inlet end, a return end, an upper permeate end and a lower permeate end;

[0022] The third liquid inlet pipe, the third liquid inlet pipe communicates with the liquid outlet pipe, the third liquid inlet pipe communicates with the inlet end, and a liquid inlet pump is installed on the third liquid inlet pipe;

[0023] The second return pipe, the second return pipe communicates with the first return pipe, and the second return pipe communicates with the return end;

[0024] The second cleaning return pipe, the second cleaning return pipe communicates with the first cleaning return pipe, and the second cleaning return pipe communicates with the third liquid inlet pipe;

[0025] The permeate pipeline, the permeate pipeline communicates with the upper permeate end;

[0026] The circulation pipeline, one end of the circulation pipeline communicates with the third liquid inlet pipe, and the other end communicates with the second return pipe;

[0027] The return discharge pipe, one end of the return discharge pipe communicates with the second return pipe, and the other end communicates with the permeate pipeline.

[0028] In an optional or preferred embodiment, the first liquid inlet pipe and the first return pipe are communicated through a second connecting pipe, and the second liquid inlet pipe is connected to the second connecting pipe.

[0029] In an optional or preferred embodiment, the self-cleaning ultrafiltration system further includes a waste water discharge pipe, which communicates with the main pipe, the waste water discharge pipe communicates with the first cleaning return pipe, the waste water discharge pipe communicates with the lower permeate end, and the waste water discharge pipe communicates with the permeate pipe.

[0030] In an optional or preferred embodiment, the self-cleaning ultrafiltration system further includes a condensate discharge pipe, which is connected to the first connecting pipe through a third connecting pipe, the condensate discharge pipe communicates with the second liquid inlet pipe, the condensate discharge pipe communicates with the second cleaning return pipe, the condensate discharge pipe communicates with the first buffer tank, and the condensate discharge pipe communicates with the steam pipe.

[0031] In an optional or preferred embodiment, a heating device is installed on the first buffer tank. The heating device includes a sandwich surrounding the first buffer tank, a first temperature control pipe and a second temperature control pipe. The first temperature control pipe is connected to the bottom of the sandwich, and the second temperature control pipe is connected to the top of the sandwich.

[0032] In an optional or preferred embodiment, the ultrafiltration buffer module further includes a ventilation pipe, which is connected to the first buffer tank, and a compressed air pipe and an exhaust pipe are connected to the ventilation pipe.

[0033] In an optional or preferred embodiment, the ultrafiltration module further includes a second buffer tank, the permeate pipe communicates with the second buffer tank, and the bottom of the second buffer tank communicates with the waste water discharge pipe.

[0034] In an optional or preferred embodiment, a plurality of ultrafiltration columns are provided. The third liquid inlet pipe is communicated with the inlet ends of the respective ultrafiltration columns through a first liquid collecting pipe, and the return ends of the respective ultrafiltration columns are communicated with the second return pipe through a second liquid collecting pipe.

[0035] In an optional or preferred embodiment, the self-cleaning ultrafiltration system further includes a feed liquid transfer pipe, one end of which is connected to the third liquid inlet pipe and the other end is directly used to connect to a production feed liquid storage tank.

[0036] In an optional or preferred embodiment, the sterile filtration module further includes a first steam pipe, which communicates with the main pipe.

[0037] Based on the above technical solution, the embodiments of the present application have at least the following beneficial effects: In the above technical solution, when it is necessary to clean the first buffer tank, first perform a clean water wash. The liquid inlet pump on the second liquid inlet pipe operates, and clean water enters the main pipe through the injection water pipe or the purified water pipe. After being aseptically filtered by the liquid filter in the main pipe, the clean water passes through the first liquid inlet pipe from the main pipe and is sprayed inside the first buffer tank through the spray ball to perform the primary cleaning of the inside of the first buffer tank. During the cleaning process, the water will flow out from the liquid outlet pipe at the bottom of the first buffer tank, pass through the third liquid inlet pipe, the second cleaning return pipe, and the first cleaning return pipe, and then be discharged. Then, clean the first buffer tank with an alkaline cleaning solution. The liquid inlet pump on the second liquid inlet pipe operates, and the alkaline solution is introduced into the first buffer tank through the alkaline solution preparation pipe. Clean water enters the main pipe through the injection water pipe or the purified water pipe, enters the first buffer tank from the main pipe through the first liquid inlet pipe. After the clean water and the alkaline solution are mixed in the first buffer tank, they flow out from the liquid outlet pipe and enter the third liquid inlet pipe, and then re-flow back into the first buffer tank after passing through the circulation pipe, the second return pipe, and the first return pipe. In this way, the alkaline cleaning solution can be prepared by the circulating flow of the alkaline solution and the clean water. After the alkaline cleaning solution is prepared, start the cleaning program. The alkaline cleaning solution inside the first buffer tank flows out from the liquid outlet pipe, passes through the third liquid inlet pipe, the circulation pipe, the second return pipe, and the first return pipe, and then sprays out from the spray ball at the top of the first buffer tank to clean the inside of the first buffer tank with the alkaline cleaning solution, thereby realizing the self-cleaning of the first buffer tank.

[0038] When it is necessary to clean the ultrafiltration column of the ultrafiltration module, the liquid inlet pump on the second liquid inlet pipe starts to operate. Clean water enters the main pipe through the injection water pipe or the purified water pipe. After being aseptically filtered by the liquid filter in the main pipe, it enters the first buffer tank through the main pipe and the second liquid inlet pipe, and then flows out from the liquid outlet pipe, passes through the third liquid inlet pipe, and enters the ultrafiltration column from the inlet end. The cleaning of the ultrafiltration column is carried out by the full discharge method at the return end, the upper permeate end, and the lower permeate end, that is, the clean water entering the ultrafiltration column is completely discharged from the return end, the upper permeate end, and the lower permeate end. The clean water discharged from the return end flows through the second return pipe, the return discharge pipe, and the permeate pipe and is discharged. The cleaning water discharged from the upper permeate end flows through the permeate pipe and is discharged. The water flowing out from the lower permeate end is directly discharged, thus completing the self-cleaning of the ultrafiltration column. When it is necessary to clean the ultrafiltration module with an alkaline cleaning solution, the liquid inlet pump on the second liquid inlet pipe starts to operate, and the flow path of the alkaline cleaning solution in the ultrafiltration module is the same as the flow path in the above clean water cleaning process. This self-cleaning ultrafiltration system can perform self-cleaning on the ultrafiltration buffer system and the ultrafiltration system, without the need for manual disassembly of the corresponding equipment for cleaning, effectively improving the cleaning efficiency, reducing the equipment downtime, and increasing the effective working time of the equipment. Description of the Drawings

[0039] The following further describes the present application in conjunction with the drawings and embodiments;

[0040] Figure 1 It is a schematic diagram of the self-cleaning ultrafiltration system provided by the embodiments of the present application;

[0041] Figure 2 is Figure 1 a schematic diagram of the sterile filtration module in the illustrated embodiment;

[0042] Figure 3 is Figure 1 a schematic diagram of the ultrafiltration buffer module in the illustrated embodiment;

[0043] Figure 4 is Figure 1 a schematic diagram of the ultrafiltration module in the illustrated embodiment. Specific Embodiments

[0044] In order to enable those skilled in the art to better understand the technical solutions in the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.

[0045] The following further describes in detail the embodiments of the present application with reference to the drawings and embodiments. The following embodiments are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0046] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0047] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0048] In the embodiments of the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0049] As an advanced membrane separation process, ultrafiltration technology has been widely applied in the fields of water treatment, food processing, biotechnology and medicine. However, existing self-cleaning ultrafiltration systems generally lack effective self-cleaning functions, and this defect seriously restricts their long-term operation efficiency and economy. In traditional self-cleaning ultrafiltration systems, with the extension of the usage time, organic substances, inorganic salts and microorganisms inevitably accumulate on the membrane surface and in the pores, forming a pollution layer and scale that are difficult to remove. This kind of pollution not only leads to a significant decrease in membrane flux and a sharp increase in energy consumption, but also greatly shortens the service life of the membrane module.

[0050] Currently, the cleaning methods commonly adopted in the industry mainly include regular manual backwashing and chemical cleaning. These methods not only require shutdown operations, affecting production continuity, but also have problems such as incomplete cleaning, complex operations and large consumption of chemical agents. More importantly, these passive cleaning methods cannot respond to membrane pollution in real time, and often deal with it only after the system performance has significantly declined. This lag seriously affects the overall efficiency of the self-cleaning ultrafiltration system. In addition, frequent manual intervention and chemical cleaning also increase the operating cost, and at the same time, the use of chemical cleaning agents also brings environmental pollution problems. The lack of a self-cleaning system also means that ultrafiltration equipment requires more professional maintenance, which not only increases the labor cost, but also limits the application of ultrafiltration technology in some remote or areas lacking human resources.

[0051] Referring to Figures 1 to 4 , the present application provides a self-cleaning ultrafiltration system, including a sterile filtration module, an ultrafiltration buffer module and an ultrafiltration module.

[0052] The sterile filtration module includes a main pipeline 1, a production feed liquid transmission pipeline 2, an injection water pipeline 6, a purified water pipeline 7 and a liquid filter 8. The production feed liquid transmission pipeline 2 is connected to the main pipeline 1, the injection water pipeline 6 is connected to the main pipeline 1, the purified water pipeline 7 is connected to the main pipeline 1, and the liquid filter 8 is arranged on the main pipeline 1.

[0053] The ultrafiltration buffer module includes a first buffer tank 9, a first liquid inlet pipe 10, a second liquid inlet pipe 11, a liquid outlet pipe 12, a first return pipe 13, an alkali solution preparation pipe 14, and a first cleaning return water pipe 15. A spray ball 16 is arranged at the inner top of the first buffer tank 9. The first liquid inlet pipe 10 is connected to the first buffer tank 9. The second liquid inlet pipe 11 is connected to the first buffer tank 9. The second liquid inlet pipe 11 is connected to the main pipeline 1. The liquid outlet pipe 12 is connected to the bottom of the first buffer tank 9. One end of the first return pipe 13 communicates with the bottom of the first buffer tank 9, and the other end is connected to the spray ball 16. The alkali solution preparation pipe 14 is connected to the first buffer tank 9. The first cleaning return water pipe 15 is connected to the first return pipe 13 through a first connecting pipe 17.

[0054] The ultrafiltration module includes an ultrafiltration column 18, a third liquid inlet pipe 19, a second return pipe 20, a second cleaning return water pipe 21, a permeate pipeline 22, a circulation pipeline 23, and a return discharge pipe 24. The ultrafiltration column 18 has an inlet end 25, a return end 26, an upper permeate end 27, and a lower permeate end 28. The third liquid inlet pipe 19 communicates with the liquid outlet pipe 12, the third liquid inlet pipe 19 communicates with the inlet end 25, and a liquid inlet pump 29 is installed on the third liquid inlet pipe 19. The second return pipe 20 communicates with the first return pipe 13, the second return pipe 20 communicates with the return end 26. The second cleaning return water pipe 21 communicates with the first cleaning return water pipe 15, the second cleaning return water pipe 21 communicates with the third liquid inlet pipe 19. The permeate pipeline 22 communicates with the upper permeate end 27. One end of the circulation pipeline 23 communicates with the third liquid inlet pipe 19, and the other end communicates with the second return pipe 20. One end of the return discharge pipe 24 communicates with the second return pipe 20, and the other end communicates with the permeate pipeline 22.

[0055] When ultrafiltration work needs to be carried out, the production feed liquid enters the first liquid inlet pipe 10 after passing through the production feed liquid transmission pipeline 2 and the main pipeline 1, and then enters the first buffer tank 9. After the production feed liquid entering the first buffer tank 9 reaches the set weight, the ultrafiltration program runs. The production feed liquid in the first buffer tank 9 flows out from the liquid outlet pipe 12, passes through the third liquid inlet pipe 19, and enters the ultrafiltration column 18 from the inlet end 25. After being filtered by the ultrafiltration column 18, the wastewater is discharged through the lower permeate end 28. The filtered water during the ultrafiltration process flows out through the upper permeate end 27 and is discharged through the permeate pipeline 22. The filtered production feed liquid enters the second return pipe 20 through the return end 26, and then continues to flow to the first buffer tank 9 through the first return pipe 13, thus forming a circulating filtration.

[0056] When the first buffer tank 9 needs to be cleaned, first perform a water rinse. The liquid inlet pump 29 on the second liquid inlet pipe 11 operates, and the clear water enters the main pipe 1 through the injection water pipe 6 or the purified water pipe 7. After being aseptically filtered by the liquid filter 8 in the main pipe 1, the clear water passes through the first liquid inlet pipe 11 from the main pipe 1 and is sprayed inside the first buffer tank 9 through the spray ball 16 to perform a primary cleaning of the inside of the first buffer tank 9. During the cleaning process, the water will flow out from the liquid outlet pipe 12 at the bottom of the first buffer tank 9, pass through the third liquid inlet pipe 19, the second cleaning return pipe 21, and the first cleaning return pipe 15, and then be discharged. Then, clean the first buffer tank 9 with an alkaline cleaning solution. The liquid inlet pump 29 on the second liquid inlet pipe 11 operates, and the alkaline solution is introduced into the first buffer tank 9 through the alkaline solution preparation pipe 14. The clear water enters the main pipe 1 through the injection water pipe 6 or the purified water pipe 7, enters the first buffer tank 9 from the main pipe 1 through the first liquid inlet pipe 11. After the clear water and the alkaline solution are mixed inside the first buffer tank 9, they flow out from the liquid outlet pipe 12 and enter the third liquid inlet pipe 19, and then re-flow back into the first buffer tank 9 after passing through the circulation pipe 23, the second return pipe 20, and the first return pipe 13. In this way, the circulation of the alkaline solution and the clear water can complete the preparation of the alkaline cleaning solution. After the alkaline cleaning solution is prepared, start the cleaning program. The alkaline cleaning solution inside the first buffer tank 9 flows out from the liquid outlet pipe 12, passes through the third liquid inlet pipe 19, the circulation pipe 23, the second return pipe 20, and the first return pipe 13, and then is sprayed out from the spray ball 16 at the top of the first buffer tank 9 to clean the inside of the first buffer tank 9, thereby realizing the self-cleaning of the first buffer tank 9.

[0057] When it is necessary to clean the ultrafiltration column 18 of the ultrafiltration module, the liquid inlet pump 29 on the second liquid inlet pipe 11 starts to work. Clear water enters the main pipe 1 through the injection water pipe 6 or the purified water pipe 7. After being aseptically filtered by the liquid filter 8 in the main pipe 1, the liquid enters the first buffer tank 9 through the main pipe 1 and the second liquid inlet pipe 11, and then flows out from the liquid outlet pipe 12, enters the ultrafiltration column 18 from the inlet end 25 through the third liquid inlet pipe 19. The cleaning of the ultrafiltration column 18 is carried out by the full discharge method at the reflux end 26, the upper permeate end 27 and the lower permeate end 28, that is, the clear water entering the ultrafiltration column 18 is completely discharged from the reflux end 26, the upper permeate end 27 and the lower permeate end 28. The clear water discharged from the reflux end 26 flows through the reflux pipe 3, the reflux discharge pipe 24 and the permeate pipe 22 and is discharged. The cleaning water discharged from the upper permeate end 27 flows through the permeate pipe 22 and is discharged. The waste water discharged from the lower permeate end 28 is directly discharged, thus completing the self-cleaning of the ultrafiltration column 18. When it is necessary to clean the ultrafiltration module with an alkaline cleaning solution, the liquid inlet pump 29 on the second liquid inlet pipe 11 starts to work. The flow path of the alkaline cleaning solution in the ultrafiltration buffer module and the ultrafiltration module is the same as that in the above-mentioned clear water cleaning process. This self-cleaning ultrafiltration system can realize self-cleaning of the ultrafiltration buffer module and the ultrafiltration module, without manual removal of the corresponding equipment for cleaning, effectively improving the cleaning efficiency, reducing the equipment downtime, and increasing the effective working time of the equipment.

[0058] In some embodiments, an automatic valve is provided on the injection water pipe 6.

[0059] When cleaning the ultrafiltration column 18, the injection water enters the main pipe 1 through the injection water pipe 6. After being aseptically filtered by the liquid filter 8 in the main pipe 1, it enters the first buffer tank 9 through the second liquid inlet pipe 11 to store water in the first buffer tank 9 first. When the water volume in the first buffer tank 9 reaches the set weight, the cleaning program of the ultrafiltration column 18 starts to run. During the running of the cleaning program of the ultrafiltration column 18, the automatic valve on the injection water pipe 6 will automatically open and close to replenish water to the first buffer tank 9, so that the water volume in the first buffer tank 9 always remains within the set parameter range.

[0060] In some embodiments, a proportional regulating valve is provided on the first liquid inlet pipe 10. When performing ultrafiltration work, the proportional regulating valve provided on the first liquid inlet pipe 10 will automatically adjust the opening degree to control the transmission speed of the production feed liquid, so as to keep the weight of the production feed liquid in the first buffer tank 9 always within the set parameter range until the production feed liquid is completely transmitted, and the ultrafiltration program continues to run until the set ultrafiltration concentration completion weight is reached, and the ultrafiltration program ends.

[0061] In some embodiments, an automatic valve is provided on the production feed liquid transfer pipeline 2. When the ultrafiltration column column balance procedure needs to be carried out: the automatic valve on the production feed liquid transfer pipeline 2 will automatically open, and the production feed liquid passes through the liquid filter 8 of the main pipeline 1 for sterile filtration from the production feed liquid transfer pipeline 2, and then enters the first buffer tank 9 through the first liquid inlet pipe 10, so as to perform column balance on the ultrafiltration column. After the ultrafiltration column column balance is completed, the ultrafiltration column column balance procedure ends.

[0062] In some embodiments, the first liquid inlet pipe 10 and the first return pipe 13 are communicated through a second connecting pipe 30, and the second liquid inlet pipe 11 is connected to the second connecting pipe 30. When ultrafiltration work needs to be carried out, the production feed liquid can enter the buffer tank 1 through the first liquid inlet pipe 10 and the second connecting pipe 30, or can enter the buffer tank 1 through the spray ball 16 after passing through the first liquid inlet pipe 10 and the second connecting pipe 30. In this way, the way for the production feed liquid to enter the buffer tank 1 is more diversified. The production feed liquid is sprayed more evenly during the process of entering the buffer tank 1 through the spray ball 16.

[0063] In some embodiments, multiple ultrafiltration columns 18 are provided. The third liquid inlet pipe 19 is communicated with the inlet ends 25 of each ultrafiltration column 18 through a first liquid collecting pipe 31, and the return ends 26 of each ultrafiltration column 18 are communicated with the second return pipe 20 through a second liquid collecting pipe 32. In this way, filtering work through multiple ultrafiltration columns 18 can improve the filtering efficiency.

[0064] In some embodiments, the ultrafiltration module further includes a feed liquid transfer pipeline 33. One end of the feed liquid transfer pipeline 33 is connected to the third liquid inlet pipe 19, and the other end is directly used to connect to the production feed liquid storage tank. When the production feed liquid needs to be transferred, the production feed liquid entering the liquid inlet pipe 2 is directly transferred to the production feed liquid storage tank through the feed liquid transfer pipeline 33 for storage.

[0065] In some embodiments, a first pressure sensor 34, a first conductivity sensor 35 and an electromagnetic flowmeter 36 are provided on the second return pipe 20. The first pressure sensor 34, the first conductivity sensor 35 and the electromagnetic flowmeter 36 are respectively used to monitor the pressure, conductivity and flow rate of the liquid flowing in the second return pipe 20, so as to monitor the cleaning situation in real time.

[0066] In some embodiments, a second pressure sensor 37, a second conductivity sensor 38, a mass flowmeter 39 and a pH sensor 40 are provided on the permeate pipeline 22. The second pressure sensor 37, the second conductivity sensor 38, the mass flowmeter 39 and the pH sensor 40 are respectively used to test the pressure, conductivity, flow rate and pH value of the liquid flowing in the permeate pipeline 22. When the cleaning of the ultrafiltration module reaches the set requirements of the second pressure sensor 37, the second conductivity sensor 38, the mass flowmeter 39 and the second pH sensor 40, the cleaning procedure of the ultrafiltration column 18 ends.

[0067] In some embodiments, a third conductivity sensor 41 is installed at the end of the first cleaning return pipe 15. The third conductivity sensor 41 monitors the conductivity at the end of the first cleaning return pipe 15. When the conductivity at the end reaches the cleaning requirement, the cleaning program of the first buffer tank 9 ends.

[0068] In some embodiments, the self-cleaning ultrafiltration system further includes a wastewater discharge pipe 42. The wastewater discharge pipe 42 is connected to the main pipe 1, the wastewater discharge pipe 42 is connected to the first cleaning return pipe 15, the wastewater discharge pipe 42 is connected to the lower permeate end 28, and the wastewater discharge pipe 42 is connected to the permeate pipe 22.

[0069] During the cleaning of the ultrafiltration column 18, the cleaning water discharged from the reflux end 26 flows through the second reflux pipe 20, the reflux discharge pipe 24 and the permeate pipe 22 and then is discharged from the wastewater discharge pipe 42. The cleaning water discharged from the upper permeate end 27 flows through the permeate pipe 22 and then is discharged from the wastewater discharge pipe 42. The cleaning water discharged from the lower permeate end 28 is directly discharged from the wastewater discharge pipe 42. The water passing through the first cleaning return pipe 15 will be discharged from the wastewater discharge pipe 42.

[0070] In some embodiments, a heating device 90 is installed on the first buffer tank 9. The heating device 90 includes a sandwich layer 91 surrounding the first buffer tank 9, a first temperature control pipe 92 and a second temperature control pipe 93. The first temperature control pipe 92 is connected to the bottom of the sandwich layer 91, and the second temperature control pipe 93 is connected to the top of the sandwich layer 91.

[0071] Specifically, during the heating process, hot water enters the sandwich layer 91 from the first temperature control pipe 92, exchanges heat with the first buffer tank 9, and then flows out from the second temperature control pipe 93.

[0072] In some embodiments, the ultrafiltration buffer module further includes a ventilation pipe 48. The ventilation pipe 48 is connected to the first buffer tank 9, and a compressed air pipe 49 and an exhaust pipe 50 are connected to the ventilation pipe 48.

[0073] When it is necessary to inflate and maintain pressure in the buffer tank 1 and the self-cleaning ultrafiltration system, compressed air is introduced into the compressed air pipe 49. The compressed air enters the inside of the buffer tank 1 through the compressed air pipe 49 and the ventilation pipe 48, and then enters each pipe and the ultrafiltration column 18 of the self-cleaning ultrafiltration system through the liquid outlet pipe 12 and the third inlet pipe 19. After the pressure in the buffer tank 1 and each pipe and the ultrafiltration column 18 of the self-cleaning ultrafiltration system stabilizes, the compressed air pipe 49 is closed. At this time, the buffer tank 1 and the self-cleaning ultrafiltration system can be maintained under pressure. When it is necessary to release the pressure, the gas can be directly discharged through the exhaust pipe 50.

[0074] In some embodiments, a plurality of gas filters 51 are serially arranged on the ventilation pipe 48. The gas filters 51 are used to filter the compressed air to reduce the entry of pollutants attached to the air into the buffer tank 1 or the self-cleaning ultrafiltration system.

[0075] In some embodiments, the ultrafiltration module further includes a second buffer tank 52, which is connected to the second buffer tank 52 through the permeate pipe 22, and the bottom of the second buffer tank 52 is connected to the wastewater discharge pipe 42.

[0076] Specifically, the bottom of the second buffer tank 52 is connected to the wastewater discharge pipe 42 through the third liquid collecting pipe 53. The liquid flowing out of the permeate pipe 22 is first buffered by the second buffer tank 52 and then discharged from the wastewater discharge pipe 42 after passing through the second buffer tank 52.

[0077] In some embodiments, the sterile filtration module further includes a first steam pipe 45, and the first steam pipe 45 is connected to the main pipe 1.

[0078] Steam passes through the first steam pipe 45, the main pipe 1, and the second liquid inlet pipe 11 into the first buffer tank 9, and then sterilizes the first buffer tank 9.

[0079] In some embodiments, the ultrafiltration module further includes a second steam pipe 46. The second steam pipe 46 is connected to the second return pipe 20, and the second steam pipe 46 is connected to the permeate pipe 22

[0080] When the ultrafiltration module needs to be sterilized, steam enters from the second steam pipe 46 to sterilize the second return pipe 20, the circulation pipe 23, the permeate pipe 22, and the second buffer tank pipe 52.

[0081] In some embodiments, the self-cleaning ultrafiltration system further includes a condensate discharge pipe 43. The condensate discharge pipe 43 is connected to the first connecting pipe 17 through a third connecting pipe 44. The condensate discharge pipe 43 is connected to the third liquid inlet pipe 19, and the condensate discharge pipe 43 is connected to the second cleaning return pipe 21.

[0082] High-temperature steam passes through the permeate pipe 22 and the second buffer tank 52 to perform high-temperature sterilization on the permeate pipe 22 and the second buffer tank 52. The sterilized condensate is discharged from the bottom of the second buffer tank 52 through the condensate discharge pipe 43.

[0083] After the first buffer tank 9 is sterilized by high-temperature steam, the condensate in the first buffer tank 9 will be discharged through the first return pipe 13, the first connecting pipe 17, and the third connecting pipe 44 and then discharged from the condensate discharge pipe 43.

[0084] Further, a steam trap is installed on the connecting pipe communicating the condensate discharge pipe 43 with the third liquid inlet pipe 19, a steam trap is installed on the connecting pipe communicating the condensate discharge pipe 43 with the second cleaning return pipe 21, and a steam trap is installed on the connecting pipe communicating the condensate discharge pipe 43 with the buffer tank 13.

[0085] The condensate discharge pipe 43 is communicated with the second steam pipe 46, and a steam trap is installed on the connecting pipe communicating the condensate discharge pipe 43 with the second steam pipe 46. The condensate is discharged to the condensate discharge pipe 43 through the steam trap.

[0086] In some embodiments, a liquid filter 54 is installed on the lye preparation pipe 14 to filter the incoming lye.

[0087] In some embodiments, a magnetic stirrer 55 is installed at the bottom of the first buffer tank 9. During the preparation of the alkaline cleaning solution, starting the magnetic stirrer 55 for stirring can make the preparation of the alkaline cleaning solution more uniform.

[0088] In some embodiments, a sampling valve is further provided on the permeate pipe 22 for convenient sampling.

[0089] In some embodiments, the self-cleaning ultrafiltration system further includes a control system. The control system includes an operation screen, which is used to operate the entire self-cleaning ultrafiltration system. Ultrafiltration operations can be performed through automatic programs, semi-automatic, and manual controls. During the ultrafiltration process, the control system receives data transmitted by the first pressure sensor 34, the first conductivity sensor 35, the electromagnetic flowmeter 36, the second pressure sensor 37, the second conductivity sensor 38, the mass flowmeter 39, and the pH sensor 40. According to these feedback data, the control system can automatically adjust the valve opening of the proportional regulating valve and the flow rate of the liquid inlet pump 29, thereby adjusting the transmembrane pressure and realizing the automatic control of the ultrafiltration process. The control system also includes a storage function. The control system can perform online monitoring and archiving of all process control data, which can be traced within the storage period, and the recorded data cannot be modified.

[0090] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0091] The embodiments of the present application have been described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present application within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A self-cleaning ultrafiltration system, characterized in that: It includes a sterile filtration module, an ultrafiltration buffer module and an ultrafiltration module, wherein The sterile filtration module comprises Main pipeline; A production liquid transmission pipeline, wherein the production liquid transmission pipeline is connected to the main pipeline; An injection water pipeline, the injection water pipeline being connected to the main pipeline; A purified water pipeline, the purified water pipeline being connected to the main pipeline; A liquid filter, wherein the liquid filter is arranged on the main pipeline; The ultrafiltration buffer module comprises A first buffer tank, wherein a spray ball is arranged on the inner top of the first buffer tank; A first liquid inlet pipe, wherein the first liquid inlet pipe is connected to the first buffer tank; a second liquid inlet pipe, the second liquid inlet pipe being connected to the first buffer tank, and the second liquid inlet pipe being connected to the main pipeline; a liquid outlet pipe connected to the bottom of the first buffer tank; A first reflux pipe, one end of which is connected to the bottom of the first buffer tank, and the other end of which is connected to the spray ball; an alkali solution preparation pipe connected to the first buffer tank; a first cleaning water return pipe, the first cleaning water return pipe being connected to the first return pipe via a first connecting pipe; The ultrafiltration module comprises An ultrafiltration column, the ultrafiltration column having an inlet end, a reflux end, an upper permeate end and a lower permeate end; a third liquid inlet pipe, the third liquid inlet pipe being connected to the liquid outlet pipe, the third liquid inlet pipe being connected to the inlet end, and a liquid inlet pump being installed on the third liquid inlet pipe; a second reflux pipe, the second reflux pipe being connected to the first reflux pipe, and the second reflux pipe being connected to the reflux end; a second cleaning water return pipe, the second cleaning water return pipe being connected to the first cleaning water return pipe, and the second cleaning water return pipe being connected to the third liquid inlet pipe; a permeate pipe, the permeate pipe being connected to the upper permeate end; a circulation pipe, one end of which is connected to the third liquid inlet pipe, and the other end of which is connected to the second return pipe; A reflux discharge pipe, one end of which is connected to the second reflux pipe, and the other end of which is connected to the permeate pipe.

2. The self-cleaning ultrafiltration system according to claim 1, characterized in that: The first liquid inlet pipe is connected to the first reflux pipe through a second connecting pipe, and the second liquid inlet pipe is connected to the second connecting pipe.

3. The self-cleaning ultrafiltration system according to claim 1, characterized in that: The self-cleaning ultrafiltration system also includes a wastewater discharge pipe, which is connected to the main pipeline, the first cleaning return pipe, the lower permeate end, and the permeate pipeline.

4. The self-cleaning ultrafiltration system according to claim 1, characterized in that: The self-cleaning ultrafiltration system also includes a condensate discharge pipe, which is connected to the first connecting pipe through a third connecting pipe, the condensate discharge pipe is connected to the second liquid inlet pipe, the condensate discharge pipe is connected to the second cleaning return pipe, and the condensate discharge pipe is connected to the first buffer tank.

5. The self-cleaning ultrafiltration system according to claim 1, characterized in that: A heating device is installed on the first buffer tank, and the heating device includes an interlayer surrounding the first buffer tank and a first temperature control pipe and a second temperature control pipe. The first temperature control pipe is connected to the bottom of the interlayer, and the second temperature control pipe is connected to the top of the interlayer.

6. The self-cleaning ultrafiltration system according to claim 1, characterized in that: The ultrafiltration buffer module also includes a ventilation pipeline, which is connected to the first buffer tank, and the ventilation pipeline is connected to a compressed air pipeline and an exhaust pipeline.

7. The self-cleaning ultrafiltration system according to claim 3, characterized in that: The ultrafiltration module further includes a second buffer tank, the permeate pipeline is connected to the second buffer tank, and the bottom of the second buffer tank is connected to the wastewater discharge pipe.

8. The self-cleaning ultrafiltration system according to claim 1, characterized in that: A plurality of ultrafiltration columns are provided, the third liquid inlet pipe is connected to the inlet end of each ultrafiltration column through a first liquid collecting pipe, and the reflux end of each ultrafiltration column is connected to the second reflux pipe through a second liquid collecting pipe.

9. The self-cleaning ultrafiltration system according to claim 1, characterized in that: The self-cleaning ultrafiltration system also includes a feed liquid transfer pipeline, one end of which is connected to the third liquid inlet pipe, and the other end is directly used to connect to the production feed liquid storage tank.

10. The self-cleaning ultrafiltration system according to claim 1, characterized in that: The sterile filtration module further includes a first steam pipe, which is connected to the main pipe.

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