Automatic cleaning device for reverse osmosis system

Abstract

The utility model belongs to the technical field of automatic control of instruments, and discloses an automatic cleaning device for a reverse osmosis system. The device mainly comprises a security filtering water tank, a high-pressure water pump, a first-section reverse osmosis membrane, a second-section reverse osmosis membrane, a filter, a cleaning fluid pump, a cleaning fluid water tank, a valve, a cleaning fluid flowmeter, a pressure gauge, a cleaning tank liquid level meter, a cleaning tank thermometer, an electric heater and a pipeline. Through automatic control of the PLC, the purpose of automatic cleaning is achieved, and the defect that workers arrive at the site for operation is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of automatic control of instruments, and relates to an automatic cleaning device for an industrial sewage reverse osmosis system. Background Technique

[0002] At present, the reverse osmosis technology is widely used in many fields such as electric power, petrochemical industry, food, and environmental protection, and plays an indispensable role in wastewater treatment. However, as mentioned by Lai Bingbing et al. in "Reverse Osmosis Membrane Cleaning Technology and Research Progress", with the increase of the use time of the reverse osmosis membrane treatment system, the reverse osmosis membrane will inevitably be contaminated, resulting in an increase in the membrane filtration resistance, a decrease in the water production rate and desalination rate, an increase in the pressure difference, and also a shortening of the membrane service life. Therefore, it is necessary to clean the reverse osmosis membrane in time to ensure the safety and reliability of the reverse osmosis membrane system and extend the service life of the membrane element. Content of the Utility Model

[0003] The purpose of the utility model is to provide an automatic cleaning device for a reverse osmosis system.

[0004] The technical solution of the utility model:

[0005] An automatic cleaning device for a reverse osmosis system mainly consists of a security filtered water tank 1, a high-pressure water pump 2, a first-stage reverse osmosis membrane, a second-stage reverse osmosis membrane, a filter 8, a cleaning liquid pump 9, a cleaning liquid water tank 10, valves, a cleaning liquid flowmeter 21, a pressure gauge, a cleaning tank liquid level gauge 25, a cleaning tank thermometer 26, an electric heater 27 and pipelines;

[0006] Both the first-stage reverse osmosis membrane and the second-stage reverse osmosis membrane include a plurality of parallel reverse osmosis membranes;

[0007] The valves include a pre-pump valve 11, a first-stage cleaning valve 12, a first-stage water production valve 13, a second-stage cleaning valve 14, a first-stage cleaning return valve 15, a second-stage water production valve 16, a concentrated water valve 17, a second-stage cleaning return valve 18, a cleaning liquid discharge valve 19 and a post-cleaning liquid pump valve 20;

[0008] The pressure gauges include a pre-filter pressure gauge 22, a post-filter pressure gauge 23 and a post-pump pressure gauge 24;

[0009] The pipelines include a first-stage cleaning inlet pipeline 31, a second-stage cleaning inlet pipeline 32, a cleaning liquid pipeline 33, a first-stage water production pipeline 34, a second-stage water production pipeline 35, a first-stage cleaning return pipeline 36, a second-stage cleaning return pipeline 37, a reverse osmosis water production pipeline 38 and a cleaning liquid discharge pipeline 39;

[0010] The outlet at the bottom of the security filter water tank 1 is connected to the high-pressure water pump 2. The valve 11 before the pump is located in the middle pipeline between the security filter water tank 1 and the high-pressure water pump 2. The outlet of the high-pressure water pump 2 is sequentially connected to a first-stage reverse osmosis membrane and a second-stage reverse osmosis membrane; the water production outlet of the first-stage reverse osmosis membrane is divided into two branches, namely a first-stage water production pipeline 34 and a first-stage cleaning return pipeline 36. A first-stage water production valve 13 and a first-stage cleaning return valve 15 are respectively provided on the first-stage water production pipeline 34 and the first-stage cleaning return pipeline 36; the concentrated water outlet of the first-stage reverse osmosis membrane directly enters the second-stage reverse osmosis membrane. The water production outlet of the second-stage reverse osmosis membrane is connected to a second-stage water production pipeline 35. A second-stage water production valve 16 is provided on the second-stage water production pipeline 35. After the second-stage water production pipeline 35 and the first-stage water production pipeline 34 converge, they are divided into two branches, namely for subsequent use and the reverse osmosis water production pipeline 38. The reverse osmosis water production pipeline 38 is connected to the water inlet above the cleaning liquid tank 10;

[0011] The concentrated water outlet of the second-stage reverse osmosis membrane is connected to a second-stage cleaning return pipeline 37. A concentrated water valve 17 and a second-stage cleaning return valve 18 are provided on the second-stage cleaning return pipeline 37; the second-stage cleaning return pipeline 37 is divided into two branches. One branch is connected to the water inlet above the cleaning liquid tank 10, and the other branch leads to subsequent concentrated water treatment; a cleaning tank liquid level gauge 25, a cleaning tank thermometer 26, and an electric heater 27 are installed inside the cleaning liquid tank 10. The lower part of the cleaning liquid tank 10 is connected to a cleaning liquid discharge pipeline 39. The water outlet at the lower part of the cleaning liquid tank 10 is connected to a cleaning liquid pump 9; the outlet of the cleaning liquid pump 9 is connected to the water inlet below the filter 8. A post-pump pressure gauge 24, a valve 20 after the cleaning liquid pump, and a post-filter pressure gauge 23 are sequentially installed on the pipeline between the two. The water outlet below the filter 8 is connected to a cleaning liquid pipeline 33. A pre-filter pressure gauge 22 and a cleaning liquid flowmeter 21 are sequentially installed on the cleaning liquid pipeline 33. After that, the cleaning liquid pipeline 33 is divided into two branches, namely a first-stage cleaning inlet pipeline 31 and a second-stage cleaning inlet pipeline 32. A first-stage cleaning valve 12 and a second-stage cleaning valve 14 are respectively provided on the first-stage cleaning inlet pipeline 31 and the second-stage cleaning inlet pipeline 32. The first-stage cleaning inlet pipeline 31 is connected to the water inlet of the first-stage reverse osmosis membrane, and the second-stage cleaning inlet pipeline 32 is connected to the water inlet of the second-stage reverse osmosis membrane.

[0012] Among them, the valves, the cleaning liquid flowmeter 21, the pressure gauges, the cleaning tank liquid level gauge 25, and the cleaning tank thermometer 26 are all connected to the programmable logic controller. The programmable logic controller realizes the control of the cleaning device through the collected signals and settings.

[0013] The effects and benefits of the present utility model are as follows: Through the automatic control of the PLC, the present utility model realizes the automatic operation of the reverse osmosis system. Different from the conventional device that requires manual chemical cleaning, this project realizes the automatic operation of operation, backwashing, chemical agent addition backwashing, and chemical cleaning, reduces the disadvantages of workers needing to operate on-site, and realizes the long-term stable operation of the system. Description of the Drawings

[0014] Figure 1 It is an automatic cleaning method for a reverse osmosis system of the present utility model.

[0015] In the figure: 1 security filter water tank, 2 high-pressure water pump, 3 first-stage reverse osmosis membrane a, 4 first-stage reverse osmosis membrane b, 5 first-stage reverse osmosis membrane n, 6 second-stage reverse osmosis membrane a, 7 second-stage reverse osmosis membrane m, 8 filter, 9 cleaning liquid pump, 10 cleaning liquid water tank, 11 valve before the pump, 12 first-stage cleaning valve, 13 first-stage product water valve, 14 second-stage cleaning valve, 15 first-stage cleaning return valve, 16 second-stage product water valve, 17 concentrated water valve, 18 second-stage cleaning return valve, 19 cleaning liquid discharge valve, 20 valve after the cleaning liquid pump, 21 cleaning liquid flowmeter, 22 pressure gauge before the filter, 23 pressure gauge after the filter, 24 pressure gauge after the pump, 25 liquid level gauge of the cleaning tank, 26 thermometer of the cleaning tank, 27 electric heater, 31 first-stage cleaning inlet pipeline, 32 second-stage cleaning inlet pipeline, 33 cleaning liquid pipeline, 34 first-stage product water pipeline, 35 second-stage product water pipeline, 36 first-stage cleaning return pipeline, 37 second-stage cleaning return pipeline, 38 reverse osmosis product water pipeline, 39 cleaning liquid discharge pipeline. Specific embodiments

[0016] The specific embodiments of the present utility model will be described in detail below in conjunction with the technical solutions and the drawings.

[0017] Example:

[0018] An automatic cleaning device for a reverse osmosis system mainly consists of a security filter water tank 1, a high-pressure water pump 2, a first-stage reverse osmosis membrane, a second-stage reverse osmosis membrane, a filter 8, a cleaning liquid pump 9, a cleaning liquid water tank 10, valves, a cleaning liquid flowmeter 21, pressure gauges, a liquid level gauge 25 of the cleaning tank, a thermometer 26 of the cleaning tank, an electric heater 27 and pipelines;

[0019] Both the first-stage reverse osmosis membrane and the second-stage reverse osmosis membrane include a plurality of parallel reverse osmosis membranes;

[0020] The valves include a valve 11 before the pump, a first-stage cleaning valve 12, a first-stage product water valve 13, a second-stage cleaning valve 14, a first-stage cleaning return valve 15, a second-stage product water valve 16, a concentrated water valve 17, a second-stage cleaning return valve 18, a cleaning liquid discharge valve 19 and a valve 20 after the cleaning liquid pump;

[0021] The pressure gauges include a pressure gauge 22 before the filter, a pressure gauge 23 after the filter and a pressure gauge 24 after the pump;

[0022] The pipeline includes a first-stage cleaning inlet pipeline 31, a second-stage cleaning inlet pipeline 32, a cleaning liquid pipeline 33, a first-stage product water pipeline 34, a second-stage product water pipeline 35, a first-stage cleaning return pipeline 36, a second-stage cleaning return pipeline 37, a reverse osmosis product water pipeline 38, and a cleaning liquid discharge pipeline 39;

[0023] The water outlet at the bottom of the security filter water tank 1 is connected to the high-pressure water pump 2. The valve 11 before the pump is located in the pipeline between the security filter water tank 1 and the high-pressure water pump 2. The water outlet of the high-pressure water pump 2 is successively connected to the first-stage reverse osmosis membrane and the second-stage reverse osmosis membrane. The product water outlet of the first-stage reverse osmosis membrane is divided into two branches, namely the first-stage product water pipeline 34 and the first-stage cleaning return pipeline 36. A first-stage product water valve 13 and a first-stage cleaning return valve 15 are respectively provided on the first-stage product water pipeline 34 and the first-stage cleaning return pipeline 36. The concentrated water outlet of the first-stage reverse osmosis membrane directly enters the second-stage reverse osmosis membrane. The product water outlet of the second-stage reverse osmosis membrane is connected to the second-stage product water pipeline 35. A second-stage product water valve 16 is provided on the second-stage product water pipeline 35. After the second-stage product water pipeline 35 and the first-stage product water pipeline 34 converge, they are divided into two branches, which are respectively sent for subsequent use and the reverse osmosis product water pipeline 38. The reverse osmosis product water pipeline 38 is connected to the water inlet above the cleaning liquid tank 10;

[0024] The concentrated water outlet of the second-stage reverse osmosis membrane is connected to the second-stage cleaning return pipeline 37. A concentrated water valve 17 and a second-stage cleaning return valve 18 are provided on the second-stage cleaning return pipeline 37. The second-stage cleaning return pipeline 37 is divided into two branches. One branch is connected to the water inlet above the cleaning liquid tank 10, and the other branch leads to subsequent concentrated water treatment. A cleaning tank level gauge 25, a cleaning tank thermometer 26, and an electric heater 27 are installed inside the cleaning liquid tank 10. The cleaning liquid tank 10 is connected to the cleaning liquid discharge pipeline 39 at the bottom. The water outlet at the bottom of the cleaning liquid tank 10 is connected to the cleaning liquid pump 9. The water outlet of the cleaning liquid pump 9 is connected to the water inlet below the filter 8. A pump rear pressure gauge 24, a valve 20 after the cleaning liquid pump, and a pressure gauge 23 after the filter are successively installed on the pipeline between them. The water outlet below the filter 8 is connected to the cleaning liquid pipeline 33. A pressure gauge 22 before the filter and a cleaning liquid flowmeter 21 are successively installed on the cleaning liquid pipeline 33. Then the cleaning liquid pipeline 33 is divided into two branches, namely the first-stage cleaning inlet pipeline 31 and the second-stage cleaning inlet pipeline 32. A first-stage cleaning valve 12 and a second-stage cleaning valve 14 are respectively provided on the first-stage cleaning inlet pipeline 31 and the second-stage cleaning inlet pipeline 32. The first-stage cleaning inlet pipeline 31 is connected to the water inlet of the first-stage reverse osmosis membrane, and the second-stage cleaning inlet pipeline 32 is connected to the water inlet of the second-stage reverse osmosis membrane.

[0025] Among them, the valves, the cleaning liquid flowmeter 21, the pressure gauges, the cleaning tank level gauge 25, and the cleaning tank thermometer 26 are all connected to the programmable logic controller. The programmable logic controller controls the cleaning device through the collected signals and settings.

[0026] During normal operation: Close the first-stage cleaning valve 12, second-stage cleaning valve 14, first-stage cleaning return valve 15, and second-stage cleaning return valve 18. Open the pre-pump valve 11, first-stage product water valve 13, second-stage product water valve 16, and concentrate water valve 17. Start the high-pressure water pump 2. The upstream wastewater first passes through the security filter 1 and then enters the first-stage reverse osmosis membrane under the action of the high-pressure water pump 2. The product water outlet is connected to the first-stage product water pipeline 34. The concentrate water continues to enter the second-stage reverse osmosis membrane. The product water outlet of the second-stage reverse osmosis membrane is connected to the second-stage product water pipeline 35, which converges with the first-stage product water pipeline 34 and leads to the subsequent process for use.

[0027] During cleaning operation: Close the pre-pump valve 11 to stop the upstream wastewater from entering the high-pressure water pump 2. The remaining water is treated by reverse osmosis. The product water enters the cleaning liquid tank 10 through the reverse osmosis product water pipeline 38 as cleaning liquid. Close the first-stage product water valve 13 and concentrate water valve 17. Open the first-stage cleaning valve 12, second-stage cleaning valve 14, first-stage cleaning return valve 15, and second-stage cleaning return valve 18. Start the cleaning liquid pump 9. In the cleaning liquid tank 10, the cleaning tank level gauge 25 is used to monitor the liquid level of the cleaning liquid tank, the electric heater 27 is used to heat the cleaning liquid, and the cleaning tank thermometer 26 is used to monitor the temperature of the cleaning liquid. Control the electric heater 27. The water pump 9 operates to draw the cleaning liquid from the lower outlet of the cleaning liquid tank 10 and introduce it into the cleaning pipeline 33. The 10μm filter 8 is used to filter impurities. There are a pre-filter pressure gauge 22, a post-filter pressure gauge 23, and a post-pump pressure gauge 24 on both sides of the 10μm filter 8 and before the cleaning liquid pump 9 to monitor the pipeline pressure. The cleaning liquid flowmeter 21 on the cleaning liquid pipeline 33 is used to monitor the pipeline flow rate and control the cleaning liquid flow rate. Then, the cleaning liquid enters the first-stage reverse osmosis membrane and the second-stage reverse osmosis membrane through the first-stage cleaning inlet pipeline 31 and the second-stage cleaning inlet pipeline 32 respectively. After the first-stage reverse osmosis membrane is cleaned, the cleaning liquid is discharged into the cleaning liquid tank through the second-stage cleaning return pipeline 37 from the upper inlet of the cleaning liquid tank. After the cleaning work is completed, the cleaning liquid is discharged from the cleaning liquid tank through the lower cleaning liquid discharge pipeline 39.

Claims

1. An automatic cleaning device for a reverse osmosis system, characterized in that, The automatic cleaning device for the reverse osmosis system mainly consists of a security filtered water tank (1), a high-pressure water pump (2), a first-stage reverse osmosis membrane, a second-stage reverse osmosis membrane, a filter (8), a cleaning liquid pump (9), a cleaning liquid water tank (10), valves, a cleaning liquid flowmeter (21), a pressure gauge, a cleaning tank liquid level gauge (25), a cleaning tank thermometer (26), an electric heater (27) and pipelines; Both the first-stage reverse osmosis membrane and the second-stage reverse osmosis membrane include multiple parallel reverse osmosis membranes; The valves include a pre-pump valve (11), a first-stage cleaning valve (12), a first-stage product water valve (13), a second-stage cleaning valve (14), a first-stage cleaning return valve (15), a second-stage product water valve (16), a concentrated water valve (17), a second-stage cleaning return valve (18), a cleaning liquid discharge valve (19) and a post-cleaning liquid pump valve (20); The pressure gauges include a pre-filter pressure gauge (22), a post-filter pressure gauge (23) and a post-pump pressure gauge (24); The pipelines include a first-stage cleaning inlet pipeline (31), a second-stage cleaning inlet pipeline (32), a cleaning liquid pipeline (33), a first-stage product water pipeline (34), a second-stage product water pipeline (35), a first-stage cleaning return pipeline (36), a second-stage cleaning return pipeline (37), a reverse osmosis product water pipeline (38) and a cleaning liquid discharge pipeline (39); The lower water outlet of the security filtered water tank (1) is connected to the high-pressure water pump (2), and the pre-pump valve (11) is located in the middle pipeline between the security filtered water tank (1) and the high-pressure water pump (2). The water outlet of the high-pressure water pump (2) is sequentially connected to the first-stage reverse osmosis membrane and the second-stage reverse osmosis membrane. The product water outlet of the first-stage reverse osmosis membrane is divided into two branches, namely the first-stage product water pipeline (34) and the first-stage cleaning return pipeline (36). A first-stage product water valve (13) and a first-stage cleaning return valve (15) are respectively provided on the first-stage product water pipeline (34) and the first-stage cleaning return pipeline (36). The concentrated water outlet of the first-stage reverse osmosis membrane directly enters the second-stage reverse osmosis membrane. The product water outlet of the second-stage reverse osmosis membrane is connected to the second-stage product water pipeline (35). A second-stage product water valve (16) is provided on the second-stage product water pipeline (35). After the second-stage product water pipeline (35) and the first-stage product water pipeline (34) converge, they are divided into two branches, which are respectively sent for subsequent use and the reverse osmosis product water pipeline (38). The reverse osmosis product water pipeline (38) is connected to the water inlet above the cleaning liquid water tank (10); The concentrated water outlet of the second-stage reverse osmosis membrane is connected to the second-stage cleaning return pipeline (37). A concentrated water valve (17) and a second-stage cleaning return valve (18) are provided on the second-stage cleaning return pipeline (37). The second-stage cleaning return pipeline (37) is divided into two branches. One branch is connected to the water inlet above the cleaning liquid tank (10), and the other branch leads to subsequent concentrated water treatment. A cleaning tank liquid level gauge (25), a cleaning tank thermometer (26) and an electric heater (27) are installed inside the cleaning liquid tank (10). The cleaning liquid tank (10) is connected to a cleaning liquid discharge pipeline (39) below, and the water outlet below the cleaning liquid tank (10) is connected to a cleaning liquid pump (9). The water outlet of the cleaning liquid pump 9 is connected to the water inlet below the filter (8), and a post-pump pressure gauge (24), a valve after the cleaning liquid pump (20), and a pressure gauge after the filter (23) are successively installed on the pipeline between the two. The water outlet below the filter (8) is connected to a cleaning liquid pipeline (33). A pressure gauge before the filter (22) and a cleaning liquid flowmeter (21) are successively installed on the cleaning liquid pipeline (33). After that, the cleaning liquid pipeline (33) is divided into two branches, namely a first-stage cleaning inlet pipeline (31) and a second-stage cleaning inlet pipeline (32). A first-stage cleaning valve (12) and a second-stage cleaning valve (14) are respectively provided on the first-stage cleaning inlet pipeline (31) and the second-stage cleaning inlet pipeline (32). The first-stage cleaning inlet pipeline (31) is connected to the water inlet of the first-stage reverse osmosis membrane, and the second-stage cleaning inlet pipeline (32) is connected to the water inlet of the second-stage reverse osmosis membrane.

2. The automatic cleaning device for a reverse osmosis system according to claim 1, characterized in that, The valve, the cleaning liquid flowmeter (21), the pressure gauge, the cleaning tank liquid level gauge (25), and the cleaning tank thermometer (26) are all connected to the programmable logic controller. The programmable logic controller controls the cleaning device through the collected signals and settings.

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