Online particle cleaning system for tubular membrane

Abstract

The utility model provides a tubular membrane on-line particle cleaning system which comprises a raw water inlet pipeline, the raw water inlet pipeline is connected with an inlet of a tubular membrane component, a concentrated water outlet of the tubular membrane component is connected with a first concentrated water branch and a second concentrated water branch in parallel, the first concentrated water branch is connected with a first particle recoverer, and the second concentrated water branch is connected with a second particle recoverer. The first concentrated water branch is connected with a first particle recoverer, the second concentrated water branch is connected with a second particle recoverer, a circulating pipeline is arranged between the first particle recoverer and the raw water inlet pipeline, the second particle recoverer is connected with a first concentrated water return pipeline, and the first particle recoverer and the second particle recoverer are both connected with a particle adder through particle recovery pipelines. A second concentrated water return pipeline is arranged between the particle adder and the first concentrated water return pipeline, a particle adding pipeline is arranged between the particle adder and the raw water inlet pipeline, and the particle adder is connected with the clear water tank through a clear water pipeline. Therefore, the membrane system can be cleaned on line without shutdown.

Description

Technical Field

[0001] The utility model belongs to the technical field of membrane cleaning, in particular to a tubular membrane online particle cleaning system. Background Art

[0002] There are two existing tubular membrane cleaning methods: chemical cleaning and physical cleaning. Chemical cleaning methods include acid cleaning, alkaline cleaning and complex cleaning, etc., which are mainly used for seriously polluted membrane systems. Their operation must be under high temperature and high alkaline or extremely acidic conditions to ensure the cleaning effect, which will seriously affect the service life of the tubular membrane; physical cleaning methods include gas cleaning, backwashing and intermittent cleaning of spherical particles, etc. At present, these methods have the disadvantages of incomplete cleaning, intermittent cleaning process and low operating efficiency. Moreover, the implementation of the above cleaning methods requires shutdown and switching the system to cleaning mode, which affects the normal operation of the system. Summary of the Invention

[0003] The problem to be solved by the utility model is to provide an online particle cleaning system for a tubular membrane, which can clean the particles of the membrane system while realizing material filtration, so that the membrane system can be cleaned online without stopping, and the membrane system can maintain a high operating flux, thereby ensuring the efficient and stable operation of the tubular membrane system. In addition, no chemical detergent is used, and a large amount of cleaning wastewater will not be generated, thereby improving the service life of the membrane and achieving obvious cleaning effect.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a tubular membrane online particle cleaning system, including a raw water inlet pipeline, the raw water inlet pipeline is sequentially provided with valve one, a circulation pump and valve two at the water inlet, the outlet of the raw water inlet pipeline is connected to the inlet of the tubular membrane assembly, the concentrated water outlet of the tubular membrane assembly is connected in parallel with a first concentrated water branch and a second concentrated water branch, the outlet of the first concentrated water branch is connected to a first particle collector, the outlet of the second concentrated water branch is connected to a second particle collector, a valve three is provided on the first concentrated water branch, a valve four is provided on the second concentrated water branch, a circulation pipeline is provided between the first particle collector and the raw water inlet pipeline, a valve five is provided on the circulation pipeline, and a valve is connected to the second particle collector. A first concentrated water return pipeline, a valve six is ​​provided on the first concentrated water return pipeline, the first particle recoverer is connected to the particle adder through the first particle recovery pipeline, a valve seven is provided on the first particle recovery pipeline, a second particle recovery pipeline is provided between the second particle recoverer and the particle adder, a valve eight is provided on the second particle recovery pipeline, a second concentrated water return pipeline is provided between the particle adder and the first concentrated water return pipeline, valves nine and valve ten are provided at the inlet and outlet of the second concentrated water return pipeline respectively, a particle dosing pipeline is provided between the particle adder and the raw water inlet pipeline, a valve eleven is provided on the particle dosing pipeline, the particle adder is connected to the clean water tank through a clean water pipeline, and a clean water pump and valve twelve are provided on the clean water pipeline.

[0005] Furthermore, the first particle collector and the second particle collector each include a recovery tank, a first inlet and a first outlet arranged on the recovery tank, and a particle discharge outlet arranged below the recovery tank. A first filter is provided at the first outlet. The outlets of the first concentrated water branch and the second concentrated water branch are respectively connected to the first inlets of the first particle collector and the second particle collector. One end of the circulation pipeline is connected to the first outlet of the first particle collector, and the other end of the circulation pipeline is connected to the raw water inlet pipeline between valve 1 and the circulation pump. The first concentrated water return pipeline is connected to the first outlet of the second particle collector.

[0006] Furthermore, the particle additive includes an additive tank body, in which cleaning particles are provided, a second inlet, a third inlet and a second outlet are provided on the additive tank body, a particle addition port and a drain outlet are provided below the additive tank body, a second filter is provided at the third inlet, the second outlet and the drain outlet, one end of the first particle recovery pipeline and the second particle recovery pipeline are respectively connected to the particle discharge outlets of the first particle recoverer and the second particle recoverer, the other end of the first particle recovery pipeline and the second particle recovery pipeline are both connected to the second inlet, the second concentrated water return pipeline is connected to the second outlet, one end of the particle addition pipeline is connected to the particle addition port, the other end of the particle addition pipeline is connected to the raw water inlet pipeline between valve two and the tubular membrane assembly, the clean water pipeline is connected to the third inlet, a drainage pipeline is provided on the drain outlet, and a valve thirteen is provided on the drainage pipeline.

[0007] Furthermore, the mesh diameters of the first filter screen and the second filter screen are smaller than the diameter of the cleaning particles.

[0008] Furthermore, a first connecting pipeline is provided between the circulation pipeline and the concentrated water outlet of the tubular membrane assembly, and a valve 14 is provided on the first connecting pipeline. A second connecting pipeline is provided between the concentrated water outlet of the tubular membrane assembly and the first concentrated water return pipeline, and a valve 15 is provided on the second connecting pipeline. A third connecting pipeline is provided between the clean water pipeline and the second concentrated water return pipeline. A fourth connecting pipeline is provided between the first concentrated water branch and the second concentrated water return pipeline, and a valve 16 is provided on the fourth connecting pipeline.

[0009] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0010] 1. The tubular membrane online particle cleaning system of the utility model can realize the normal operation of the tubular membrane system when not cleaning by controlling the opening of each valve, thereby achieving the purpose of raw water filtration. When the tubular membrane is contaminated and particle cleaning is required, the cleaning particles are transported to the filtration system without affecting the raw water filtration. The particles of the membrane system are cleaned while the material is filtered, so that the membrane system can be cleaned online without stopping the machine. On the one hand, the membrane system maintains a high operating flux, ensuring the efficient and stable operation of the tubular membrane system. On the other hand, the cleaning system does not use chemical detergents, thereby increasing the service life of the membrane and at the same time does not generate a large amount of cleaning wastewater, effectively reducing the cost of wastewater treatment.

[0011] 2. The tubular membrane online particle cleaning system of the utility model, after the cleaning particles have completed one cleaning and returned to the particle feeder, the water in the clean water tank is pumped into the particle feeder through the clean water pump to clean the particles, which is convenient for the next particle addition of the cleaning system, so that the cleaning system can repeatedly perform cleaning operations on the tubular membrane components. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural diagram of Example 1 of a tubular membrane online particle cleaning system of the present invention.

[0013] Figure 2 This is a structural diagram of Example 2 of a tubular membrane online particle cleaning system of the present invention.

[0014] Figure 3 The utility model is a structural schematic diagram of a particle collector of a tubular membrane online particle cleaning system.

[0015] Figure 4 The utility model is a structural schematic diagram of a particle feeder of a tubular membrane online particle cleaning system.

[0016] In the figure: 1-raw water inlet pipeline; 2-valve one; 3-circulation pump; 4-valve two; 5-tubular membrane module; 6-first concentrated water branch; 7-second concentrated water branch; 8-first particle collector; 9-second particle collector; 10-valve three; 11-valve four; 12-circulation pipeline; 13-valve five; 14-first concentrated water return pipeline; 15-valve six; 16-first particle recovery pipeline; 17-particle feeder; 18-valve seven; 19-second particle recovery pipeline; 20-valve eight; 21-second concentrated water return pipeline; 22-valve nine; 23-valve ten; 24-particle dosing pipeline; 25-valve eleven; 26-clean water pipeline; 27-clean water tank; 28-clean water pump; 29-valve 12; 30-recovery tank; 31-first inlet; 32-first outlet; 33-particle outlet; 34-first filter; 35-adder tank; 36-cleaning particles; 37-second inlet; 38-third inlet; 39-second outlet; 40-particle addition port; 41-drain outlet; 42-second filter; 43-drain pipeline; 44-valve 13; 45-first connecting pipeline; 46-valve 14; 47-second connecting pipeline; 48-valve 15; 49-third connecting pipeline; 50-fourth connecting pipeline; 51-valve 16. DETAILED DESCRIPTION

[0017] The specific implementation of the present utility model is described in detail below with reference to the accompanying drawings.

[0018] Example 1

[0019] like Figure 3 and Figure 4As shown, the tubular membrane online particle cleaning system includes a particle collector and a particle additive, wherein the particle collector includes a recovery tank 30, a first inlet 31 and a first outlet 32 ​​arranged on the recovery tank 30, and a particle discharge outlet 33 arranged below the recovery tank 30, and a first filter screen 34 is provided at the first outlet 32; the particle additive 17 includes an additive tank body 35, cleaning particles 36 are provided in the additive tank body 35, a second inlet 37, a third inlet 38 and a second outlet 39 are provided on the additive tank body 35, a particle addition port 40 and a drain outlet 41 are provided below the additive tank body 35, and a second filter screen 42 is provided at the third inlet 38, the second outlet 39 and the drain outlet 41.

[0020] like Figure 1As shown, a tubular membrane online particle cleaning system includes a raw water inlet pipeline 1, the raw water inlet pipeline 1 is sequentially provided with a valve 1 2, a circulation pump 3 and a valve 2 4 at the water inlet, the outlet of the raw water inlet pipeline 1 is connected to the inlet of the tubular membrane assembly 5, the concentrated water outlet of the tubular membrane assembly 5 is connected in parallel with a first concentrated water branch 6 and a second concentrated water branch 7, the outlet of the first concentrated water branch 6 is connected to the first inlet 31 of the first particle recovery device 8, the outlet of the second concentrated water branch 7 is connected to the first inlet 31 of the second particle recovery device 9, the first concentrated water branch 6 is provided with a valve 3 10, the second concentrated water branch 7 is provided with a valve 4 11, and a valve 6 is provided between the first particle recovery device 8 and the raw water inlet pipeline 1. A circulation pipeline 12 is provided, one end of the circulation pipeline 12 is connected to the first outlet 32 ​​of the first particle collector 8, the other end of the circulation pipeline 12 is connected to the raw water inlet pipeline 1 between the valve 1 2 and the circulation pump 3, a valve 5 13 is provided on the circulation pipeline 12, the first outlet 32 ​​of the second particle collector 9 is connected to the first concentrated water return pipeline 14, the first concentrated water return pipeline 14 is provided with a valve 6 15, the first particle collector 8 is connected to the particle feeder 17 through the first particle recovery pipeline 16, the first particle recovery pipeline 16 is provided with a valve 7 18, a second particle recovery pipeline 19 is provided between the second particle collector 9 and the particle feeder 17, the second particle recovery pipeline 19 is provided between the second particle collector 9 and the particle feeder 17, and the second particle recovery pipeline 19 is provided between the second particle collector 9 and the particle feeder 17. A valve eight 20 is provided on the pipeline 19. One end of the first particle recovery pipeline 16 and the second particle recovery pipeline 19 are connected to the particle discharge outlet 33 of the first particle collector 8 and the second particle collector 9, respectively. The other ends of the first particle recovery pipeline 16 and the second particle recovery pipeline 19 are both connected to the second inlet 37 of the particle feeder 17. A second concentrated water return pipeline 21 is provided between the particle feeder 17 and the first concentrated water return pipeline 14. A valve nine 22 and a valve ten 23 are provided at the inlet and outlet of the second concentrated water return pipeline 21, respectively. One end of the second concentrated water return pipeline 21 is connected to the second outlet 39 of the particle feeder 17, and the other end is connected to the first concentrated water return pipeline 14. A particle adding pipeline 24 is provided between the particle additive 17 and the raw water inlet pipeline 1, and a valve 11 25 is provided on the particle adding pipeline 24. One end of the particle adding pipeline 24 is connected to the particle adding port 40, and the other end of the particle adding pipeline 24 is connected to the raw water inlet pipeline 1 between the valve 2 4 and the tubular membrane assembly 5. The particle additive 17 is connected to the clean water tank 27 through the clean water pipeline 26, and a clean water pump 28 and a valve 12 29 are provided on the clean water pipeline 26. The outlet of the clean water pipeline 26 is connected to the third inlet 38 of the particle additive 17, and a drainage pipeline 43 is provided on the drainage outlet 41 of the particle additive 17, and a valve 13 44 is provided on the drainage pipeline 43.

[0021] The mesh diameters of the first filter 34 and the second filter 42 are smaller than the diameter of the cleaning particles 36 , which can effectively intercept the cleaning particles 36 and facilitate the circulation and recovery of the cleaning particles 36 .

[0022] The working process of a tubular membrane online particle cleaning system of the present invention is as follows: when a new system is just started and particle cleaning is not required, the clean water pump 28 is not started, valve one 2, valve two 4, valve three 10, valve four 11, valve five 13 and valve six 15 are opened, and other valves are closed. The circulation pump 3 is started to pump raw water into the tubular membrane assembly 5 for filtration. After the filtered concentrated water comes out of the concentrated water outlet, it is divided into two paths. One path passes through the first concentrated water branch 6, the first particle recoverer 8 and the circulation pipeline 12 and then returns to the raw water inlet pipeline 1 for circulation filtration. The other path passes through the second concentrated water branch 7, the second particle recoverer 9 and the first concentrated water return pipeline 14 and then returns to the raw water for circulation filtration, thereby realizing normal membrane filtration of the raw water.

[0023] When the membrane filtration system is contaminated and needs to be cleaned, open valve 12 29, start the clean water pump 28, and then open valve 11 25. Use the clean water pump 28 to add the cleaning particles 36 in the particle adder to the raw water inlet pipe 1 through the particle adding pipe 24. After all the cleaning particles have entered the system, close valve 11 25 and valve 12 29, turn off the clean water pump 28, and the cleaning particles 36 enter the tubular membrane assembly 5 with the raw water to clean the membrane, and then enter the particle collector. When all the cleaning particles 36 have entered the first particle collector 8 and the second particle collector 9, open valve 7 18, valve 8 20, valve 9 22 and valve 10 2 3. The cleaning particles 36 enter the particle feeder 17 together with the concentrated water through the first particle recovery line 16 and the second particle recovery line 19. The concentrated water returns to the raw water through the second concentrated water return line 21 and the first concentrated water return line 14. All the cleaning particles 36 return to the particle feeder 17. Then, close valve seven 18, valve eight 20, valve nine 22 and valve ten 23, start the clean water pump 28, open valve twelve 29 and valve thirteen 44, and use clean water to rinse the cleaning particles 36. This completes one tubular membrane online particle cleaning. The above process can be repeated until the membrane flux recovers to the target flux, thus achieving online particle cleaning without shutting down the membrane system.

[0024] Example 2

[0025] like Figure 2 As shown, the difference from Example 1 is that a first connecting pipeline 45 is set between the circulation pipeline 12 and the concentrated water outlet of the tubular membrane module 5, and a valve 14 46 is provided on the first connecting pipeline 45; a second connecting pipeline 47 is set between the concentrated water outlet of the tubular membrane module 5 and the first concentrated water return pipeline 14, and a valve 15 48 is provided on the second connecting pipeline 47; a third connecting pipeline 49 is set between the clean water pipeline 26 and the second concentrated water return pipeline 21; a fourth connecting pipeline 50 is set between the first concentrated water branch 6 and the second concentrated water return pipeline 21, and a valve 16 51 is provided on the fourth connecting pipeline 50.

[0026] The working process of a tubular membrane online particle cleaning system of the present invention is as follows: when a new system is just started and particle cleaning is not required, the clean water pump 28 is not started, valve 1 2, valve 2 4, valve 14 46 and valve 15 48 are opened, and other valves are closed. The circulation pump 3 is started to pump raw water into the tubular membrane assembly 5 for filtration, and the concentrated water is divided into two paths through the concentrated water outlet. One path passes through the first connecting pipeline 45 and the circulation pipeline 12 and then enters the raw water inlet pipeline 1 for circulation filtration, and the other path passes through the second connecting pipeline 47 and the first concentrated water return pipeline 14 and then enters the raw water for circulation filtration, thereby realizing normal membrane filtration of the raw water.

[0027] When the membrane filtration system is contaminated and needs to be cleaned, first open valve three 10, valve four 11, valve five 13 and valve six 15, close valve fourteen 46 and valve fifteen 48, then open valve eleven 25 and valve twelve 29, start the clean water pump 28, and use the clean water pump 28 to add the cleaning particles 36 in the particle feeder 17 to the raw water inlet pipe 1 through the particle feeding pipe 24. After all the cleaned particles 36 enter the system, close valve eleven 25 and valve twelve 29, turn off the clean water pump 28, and clean the particles. 36 enters the tubular membrane assembly 5 with the raw water to clean the membrane. Then, the cleaning particles 36 follow the concentrated water through the first concentrated water branch 6 and the second concentrated water branch 7 and enter the first particle recovery device 8 and the second particle recovery device 9. The concentrated water entering the first particle recovery device 8 enters the raw water inlet pipe 1 through the circulation pipe 12. The concentrated water entering the second particle recovery device 9 returns to the raw water through the first concentrated water return pipe 14. When all the cleaning particles 36 enter the first particle recovery device 8 and the second particle recovery device 9, first open the Valve 14 46 and valve 15 48 are closed, valve 3 10, valve 4 11, valve 5 13 and valve 6 15 are closed, then valve 10 23, valve 8 20, valve 7 18, valve 16 51 and valve 13 44 are opened, the clean water pump 28 is started, and a portion of the clean water passes through the clean water pipe 26, the third connecting pipe 49, the second concentrated water return pipe 21, and the first concentrated water return pipe 14 into the second particle collector 9 to flush the cleaned particles 36 back to the particle feeder 17 through the second particle recovery pipe 19, and a portion of the clean water is returned to the particle feeder 17 through the second particle recovery pipe 19. The clean water enters the first particle recoverer 8 through the clean water pipeline 26, the third connecting pipeline 49, the second concentrated water return pipeline 21, the fourth connecting pipeline 50 and the first concentrated water branch 6, and the cleaned particles 36 are flushed back to the particle feeder 17 through the first particle recovery pipeline 16. The excess water is discharged through the drainage pipeline 43. When all the cleaned particles 36 return to the particle feeder 17, the online particle cleaning of the tubular membrane is completed. The above process can be repeated until the membrane flux recovers to the target flux, thereby realizing online particle cleaning without shutting down the membrane system.

[0028] When the membrane flux after cleaning reaches the target flux, all the cleaned particles 36 return to the particle feeder 17, close valve 10 23, valve 8 20, valve 7 18 and valve 16 51, open valve 12 29 and valve 13 44, start the clean water pump 28, rinse the particles with clean water until no dirt is discharged, stop the clean water pump, close valve 12 29 and valve 13 44, and wait for the next cleaning.

[0029] Compared with Example 1, in Example 2, the raw water filtration system no longer passes through the particle recovery device, and when the cleaned particles are flushed back to the particle feeder, they are directly flushed back with clean water, which plays a certain cleaning role while recycling and can directly enter the next cleaning system.

[0030] The above describes an embodiment of the present invention in detail. However, the above content is only a preferred embodiment of the present invention and should not be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent application of the present invention.

Claims

1. A tubular membrane online particle cleaning system, characterized by: The invention comprises a raw water inlet pipeline, wherein the raw water inlet pipeline is provided with valve 1, a circulation pump and valve 2 in sequence at the water inlet, the outlet of the raw water inlet pipeline is connected to the inlet of the tubular membrane assembly, the concentrated water outlet of the tubular membrane assembly is connected in parallel with a first concentrated water branch and a second concentrated water branch, the outlet of the first concentrated water branch is connected to a first particle collector, the outlet of the second concentrated water branch is connected to a second particle collector, a valve 3 is provided on the first concentrated water branch, a valve 4 is provided on the second concentrated water branch, a circulation pipeline is provided between the first particle collector and the raw water inlet pipeline, a valve 5 is provided on the circulation pipeline, the second particle collector is connected to a first concentrated water return pipeline, the first concentrated water return pipeline A valve six is ​​provided on it, the first particle collector is connected to the particle additive through a first particle recovery pipeline, a valve seven is provided on the first particle recovery pipeline, a second particle recovery pipeline is provided between the second particle collector and the particle additive, a valve eight is provided on the second particle recovery pipeline, a second concentrated water return pipeline is provided between the particle additive and the first concentrated water return pipeline, valves nine and valve ten are provided at the inlet and outlet of the second concentrated water return pipeline respectively, a particle dosing pipeline is provided between the particle additive and the raw water inlet pipeline, a valve eleven is provided on the particle dosing pipeline, the particle additive is connected to the clean water tank through a clean water pipeline, and a clean water pump and valve twelve are provided on the clean water pipeline.

2. The tubular membrane online particle cleaning system according to claim 1, characterized in that: The first particle collector and the second particle collector each include a recovery tank, a first inlet and a first outlet arranged on the recovery tank, and a particle discharge outlet arranged below the recovery tank. A first filter is provided at the first outlet. The outlets of the first concentrated water branch and the second concentrated water branch are respectively connected to the first inlets of the first particle collector and the second particle collector. One end of the circulation pipeline is connected to the first outlet of the first particle collector, and the other end of the circulation pipeline is connected to the raw water inlet pipeline between valve 1 and the circulation pump. The first concentrated water return pipeline is connected to the first outlet of the second particle collector.

3. The tubular membrane online particle cleaning system according to claim 2, characterized in that: The particle additive includes an additive tank body, in which cleaning particles are provided, a second inlet, a third inlet and a second outlet are provided on the additive tank body, a particle addition port and a drain outlet are provided below the additive tank body, a second filter screen is provided at the third inlet, the second outlet and the drain outlet, one end of the first particle recovery pipeline and the second particle recovery pipeline are respectively connected to the particle discharge outlets of the first particle collector and the second particle collector, the other ends of the first particle recovery pipeline and the second particle recovery pipeline are both connected to the second inlet, the second concentrated water return pipeline is connected to the second outlet, one end of the particle addition pipeline is connected to the particle addition port, the other end of the particle addition pipeline is connected to the raw water inlet pipeline between valve 2 and the tubular membrane assembly, the clean water pipeline is connected to the third inlet, a drainage pipeline is provided on the drain outlet, and a valve thirteen is provided on the drainage pipeline.

4. The tubular membrane online particle cleaning system according to claim 3, characterized in that: The mesh diameters of the first filter screen and the second filter screen are smaller than the diameter of the cleaning particles.

5. The tubular membrane online particle cleaning system according to any one of claims 1 to 4, characterized in that: A first connecting pipeline is provided between the circulation pipeline and the concentrated water outlet of the tubular membrane assembly, and a valve 14 is provided on the first connecting pipeline. A second connecting pipeline is provided between the concentrated water outlet of the tubular membrane assembly and the first concentrated water return pipeline, and a valve 15 is provided on the second connecting pipeline. A third connecting pipeline is provided between the clean water pipeline and the second concentrated water return pipeline. A fourth connecting pipeline is provided between the first concentrated water branch and the second concentrated water return pipeline, and a valve 16 is provided on the fourth connecting pipeline.

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