A reverse osmosis membrane element testing system

Abstract

The utility model belongs to the reverse osmosis membrane test technical field provides a kind of reverse osmosis membrane element test system, comprising: raw water tank, for supplying raw water;First filter, with raw water tank through inlet conduit intercommunication, for carrying out primary filtration to raw water, inlet conduit is divided into first pipeline and second pipeline in the water outlet side of first filter;First test membrane group, with first pipeline intercommunication, for installing reverse osmosis membrane;Second test membrane group, with second pipeline intercommunication, and with first test membrane group parallelly arranged, for installing reverse osmosis membrane;First pipeline and second pipeline converge after the water outlet side of first test membrane group, second test membrane group and divide into pure water pipeline and thick water pipeline, the end of pure water pipeline is equipped with the pure water tank for collecting filtered pure water, the end of thick water pipeline is equipped with the thick water tank for collecting filtered thick water;The utility model not only can be realized in the same water quality condition to different size membrane element test, also can be realized by adjusting the membrane element quantity of first test membrane group or second test membrane group, the reverse osmosis membrane element test of multiple components, improve the adaptability of reverse osmosis membrane equipment.

Description

Technical Field

[0001] This utility model relates to the field of reverse osmosis membrane testing technology, and in particular to a reverse osmosis membrane element testing system. Background Technology

[0002] Reverse osmosis technology is one of the most advanced and energy-efficient separation technologies available today. Its application in the water treatment industry is becoming increasingly widespread and large-scale. Reverse osmosis systems are used in many fields, including seawater desalination, brackish water desalination, industrial wastewater treatment, and advanced municipal water supply treatment. A reverse osmosis membrane testing system is used to test reverse osmosis membrane elements, primarily to measure their desalination rate, recovery rate, and other indicators. Reverse osmosis membrane elements generally need to pass relevant tests before being put into use.

[0003] In related technologies, traditional reverse osmosis membrane testing equipment adopts a fixed membrane housing design, which only supports testing of membrane elements of a single size. The equipment's adaptability is limited, making it difficult to adapt to industrial-grade membrane modules of different lengths or diameters. Utility Model Content

[0004] This invention provides a reverse osmosis membrane element testing system to solve the technical problem of limited adaptability of existing reverse osmosis membrane testing equipment.

[0005] This utility model provides a reverse osmosis membrane element testing system, which includes: a raw water tank for supplying raw water;

[0006] The first filter is connected to the raw water tank through an inlet pipe and is used to perform initial filtration of the raw water. The inlet pipe is divided into a first pipe and a second pipe on the outlet side of the first filter.

[0007] The first test membrane assembly is connected to the first pipeline and is used to install the reverse osmosis membrane;

[0008] The second test membrane group is connected to the second pipeline and is arranged in parallel with the first test membrane group for installing reverse osmosis membranes;

[0009] The first pipeline and the second pipeline converge at the outlet side of the first test membrane group and the second test membrane group and then split into a pure water pipeline and a concentrated water pipeline. The end of the pure water pipeline is provided with a pure water tank for collecting pure water, and the end of the concentrated water pipeline is provided with a concentrated water tank for collecting the concentrated water produced by filtration.

[0010] In one embodiment of the present invention, the first test membrane assembly includes a plurality of first membrane housings for installing reverse osmosis membranes. The first membrane housings are connected to each other through a third pipeline. A first valve assembly is provided on the third pipeline between adjacent first membrane housings. By controlling the opening and closing of the first valve assembly, the plurality of first membrane housings can be connected in series or in parallel. The second test membrane assembly includes a plurality of second membrane housings for installing reverse osmosis membranes. The second membrane housings are connected to each other through a fourth pipeline. A second valve assembly is provided on the fourth pipeline between adjacent second membrane housings. By controlling the opening and closing of the second valve assembly, the plurality of second membrane housings can be connected in series or in parallel. The first membrane housings and the second membrane housings have different sizes.

[0011] In one embodiment of the present invention, the concentrate pipeline is provided with a first return pipeline for returning concentrate. One end of the first return pipeline is connected to the concentrate pipeline near the second test membrane assembly, and the other end of the first return pipeline is connected to the inlet pipeline near the outlet side of the first filter. The first return pipeline is provided with a first return valve for controlling the concentrate return flow rate, a flow meter for monitoring the concentrate return flow rate, and a check valve for preventing backflow.

[0012] In one embodiment of the present invention, the pure water tank is further provided with a second return pipeline for returning pure water. One end of the second return pipeline is connected to the pure water tank, and the other end of the second return pipeline is connected to the outlet side of the first pipeline near the first filter. A second return valve for controlling the return flow rate of pure water is provided on the second return pipeline.

[0013] In one embodiment of this utility model, the reverse osmosis membrane element testing system further includes a cleaning pipeline. One end of the cleaning pipeline is connected to the pure water pipeline near the pure water tank, and the other end of the cleaning pipeline is connected to the second pipeline near the inlet side of the second test membrane group. The cleaning pipeline is sequentially provided with a cleaning water tank, a cleaning pump, and a second filter. The first pipeline and the second pipeline are connected by a connecting pipeline. The cleaning pump pumps water from the cleaning water tank, which, after being filtered by the second filter, flows into the second test membrane group. The cleaning water is then diverted to the first test membrane group through the connecting pipeline to simultaneously clean both the first and second test membrane groups.

[0014] In one embodiment of the present invention, the reverse osmosis membrane element testing system further includes a dosing device disposed between the raw water tank and the first filter for adding scale inhibitor.

[0015] In one embodiment of this utility model, the concentrate pipeline is further provided with a first circulation pipeline, one end of the first circulation pipeline is connected to the concentrate pipeline near the concentrate tank, and the other end of the first circulation pipeline is connected to the raw water tank. The first circulation pipeline is provided with a third valve. The pure water pipeline is further provided with a second circulation pipeline, one end of the second circulation pipeline is connected to the pure water pipeline near the pure water tank, and the other end of the second circulation pipeline is connected to the raw water tank. The second circulation pipeline is provided with a fourth valve.

[0016] In one embodiment of the present invention, both the first pipeline and the second pipeline are equipped with high-pressure pumps for adjusting the inlet water flow.

[0017] In one embodiment of the present invention, both the first pipeline and the second pipeline are provided with check valves for preventing backflow, and the check valves are located on the outlet side of the first pipeline and the second pipeline near the high-pressure pump.

[0018] In one embodiment of this utility model, the pure water pipeline is equipped with a conductivity meter for monitoring the conductivity of pure water and a flow meter for monitoring the flow rate of pure water, and the concentrate pipeline is equipped with a flow meter for monitoring the flow rate of concentrate and a pressure gauge for monitoring the pressure of concentrate.

[0019] The beneficial effects of this utility model are as follows: The reverse osmosis membrane element testing system proposed in this utility model, by setting up a first test membrane group and a second test membrane group, allows membrane elements of different sizes to be installed in the first test membrane group and the second test membrane group respectively when testing reverse osmosis membrane elements. This not only enables the testing of membrane elements of different sizes under the same water quality conditions, but also allows for the testing of multiple reverse osmosis membrane elements by adjusting the number of membrane elements in the first or second test membrane group, thereby improving the adaptability of reverse osmosis membrane equipment. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0021] In the attached diagram:

[0022] Figure 1 This is a schematic diagram of the structure of a reverse osmosis membrane element testing system provided in an embodiment of the present invention;

[0023] Figure 2A schematic diagram of the structure of the first and second test membrane groups provided in an embodiment of the present invention under a three-membrane housing assembly;

[0024] Figure 3 This is a schematic diagram of the structure of the second test membrane assembly provided in an embodiment of the present invention, under 12 membrane housing components.

[0025] The attached figures are labeled as follows:

[0026] 1-Raw water tank; 2-Dosing device; 3-Inlet water pipe; 4-First filter; 5-First pipe; 6-Second pipe; 7-High-pressure pump; 8-First membrane housing; 9-Second membrane housing; 10-Pure water pipe; 11-Pure water tank; 12-Concentrate pipe; 13-Concentrate tank; 14-First return pipe; 15-First return valve; 16-Flow meter; 17-Check valve; 18-Second return pipe; 19-Raw water valve; 20-First path; 21-Second path; 22-Control valve; 23-Second return valve; 24-Cleaning pipe; 25-Cleaning water tank; 26-Cleaning pump; 27-Second filter; 28-First circulation pipe; 29-Third valve; 30-Second circulation pipe; 31-Fourth valve; 32-Conductivity meter; 33-Connecting pipe; 34-Fifth valve. Detailed Implementation

[0027] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0028] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0029] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0030] Please see Figure 1, Figure 1 This is a schematic diagram of a reverse osmosis membrane element testing system provided in an embodiment of the present invention, as shown below. Figure 1 As shown, this utility model exemplarily proposes a reverse osmosis membrane element testing system, comprising:

[0031] Raw water tank 1 is used to supply raw water;

[0032] The first filter 4 is connected to the raw water tank 1 through the inlet pipe 3 and is used to perform initial filtration of the raw water. The inlet pipe 3 is divided into the first pipe 5 and the second pipe 6 on the outlet side of the first filter 4.

[0033] The first test membrane assembly is connected to the first pipeline 5 and is used to install the reverse osmosis membrane.

[0034] The second test membrane group is connected to the second pipeline 6 and is set in parallel with the first test membrane group for installing reverse osmosis membranes.

[0035] The first pipeline 5 and the second pipeline 6 converge at the outlet side of the first test membrane group and the second test membrane group and then divide into a pure water pipeline 10 and a concentrated water pipeline 12. The end of the pure water pipeline 10 is provided with a pure water tank 11 for collecting the filtered pure water, and the end of the concentrated water pipeline 12 is provided with a concentrated water tank 13 for collecting the concentrated water produced by filtration.

[0036] It should be noted that traditional industrial reverse osmosis membrane testing equipment has the following shortcomings: 1. Insufficient flexibility: Traditional testing equipment typically uses a fixed membrane housing design, supporting only single-size membrane elements and making it difficult to adapt to industrial-grade membrane modules of different lengths or diameters; 2. Lack of recovery rate and stage adjustment functions: Traditional testing equipment uses a fixed process and lacks a mechanism for dynamically adjusting the recovery rate, failing to simulate operating parameters under different water quality and pressure conditions in actual working conditions, resulting in low matching degree between test results and actual application scenarios; 3. Low integration of cleaning systems: Traditional testing equipment usually does not have a built-in high-efficiency cleaning module, requiring disassembly of the membrane module for manual cleaning after testing, which can easily cause secondary pollution or membrane damage, affecting testing efficiency and equipment reusability; 4. Limited pressure control: Traditional testing equipment is mostly equipped with a single pressure pump, unable to achieve alternating high and low pressure testing or composite pressure modes, making it difficult to assess the performance degradation of membrane elements under complex pressure fluctuations.

[0037] In the reverse osmosis membrane element testing system provided by this utility model, by setting up a first test membrane group and a second test membrane group, when testing reverse osmosis membrane elements, by installing membrane elements of different sizes in the first test membrane group and the second test membrane group respectively, it is possible not only to test membrane elements of different sizes under the same water quality conditions, but also to achieve multi-component reverse osmosis membrane element testing by adjusting the number of membrane elements in the first test membrane group or the second test membrane group, thereby improving the adaptability of reverse osmosis membrane equipment.

[0038] In this embodiment, the first test membrane group includes multiple first membrane housings 8 for installing reverse osmosis membranes. The first membrane housings 8 are connected to each other through a third pipeline. A first valve assembly is provided on the third pipeline between adjacent first membrane housings 8. By controlling the opening and closing of the first valve assembly, the multiple first membrane housings 8 can be connected in series or in parallel. The second test membrane group includes multiple second membrane housings 9 for installing reverse osmosis membranes. The second membrane housings 9 are connected to each other through a fourth pipeline. A second valve assembly is provided on the fourth pipeline between adjacent second membrane housings 9. By controlling the opening and closing of the second valve assembly, the multiple second membrane housings 9 can be connected in series or in parallel. The first membrane housings 8 and second membrane housings 9 have different sizes. Specifically, by setting first membrane housings 8 and second membrane housings 9 of different sizes, reverse osmosis membrane elements of different lengths or diameters can be adapted for synchronous testing. By adjusting the opening and closing of the first valve assembly or the second valve assembly, the series and parallel combination relationship between the first membrane housings 8 or the second membrane housings 9 and the number of stages of the first test membrane group or the second test membrane group can be adjusted, thereby improving the flexibility of the test system.

[0039] Specifically, the number of membrane shell connections in the first and second test membrane groups can be increased according to actual testing needs. In one embodiment, for example... Figure 2 As shown, the second membrane housing 9 of the second test membrane group is equipped with three 8040 membrane modules connected in parallel for testing. The second valve assembly includes inlet valves a1, a2, and a3; concentrate diversion valves b1 and b2; concentrate discharge valves c1, c2, c3, and c4; and pure water discharge valves d1, d2, and d3. After the test system is turned on, inlet valves a1, a2, and a3 are opened, and the opening degree of inlet valve a1 is adjusted to 25%. The inlet flow rate of the high-pressure pump 7 is set to 15 m³ / s. 3 With an inlet water pressure of 225 psi, close the concentrate diversion valves b1 and b2, and open the concentrate discharge valves c1, c2, c3, and c4. Set the opening of the concentrate discharge valve c4 to 85%, so that the concentrate flow rate monitored by the flow meter 16 at the concentrate discharge valve c4 reaches 12.75 m³ / h. 3 / h, open the pure water discharge valves d1, d2, and d3, so that the product water flow rate monitored by flow meter 16 at pure water discharge valve d1 reaches 2.25m³ / h. 3 / h, record the conductivity and pressure data of permeate and concentrate. At this time, the second test membrane group is connected in parallel to conduct membrane element testing, that is, the 15% recovery rate test of 3 membrane modules.

[0040] In one embodiment, such as Figure 3As shown, the second membrane housing 9 of the second test membrane group is equipped with 12 8040 membrane modules connected in series for testing. The second valve assembly includes inlet valves a1, a2, ..., a12, concentrate diversion valves b1, b2, ..., b11, concentrate discharge valves c1, c2, ..., c13, and pure water discharge valves d1, d2, ..., d12. After the test system is turned on, the opening degree of inlet valve a1 is opened and adjusted to 30%, and the inlet flow rate of high-pressure pump 7 is set to 18 m³ / s. 3 With an inlet water pressure of 225 psi, close inlet valves a2, ..., a12, close concentrate discharge valves c1, c2, ..., c11, open concentrate diversion valves b1, b2, ..., b11, open concentrate discharge valves c12 and c13, and adjust the opening of concentrate discharge valve c13 to 72%, so that the concentrate flow rate monitored by flow meter 16 at concentrate discharge valve c13 reaches 5.05 m³ / h. 3 / h, open the pure water discharge valves d1, d2, ..., d12, so that the product water flow rate monitored by flow meter 16 at pure water discharge valve d1 reaches 12.95m³ / h. 3 / h, record the conductivity and pressure data of permeate and concentrate. At this time, the second test membrane group is connected in series to conduct membrane element testing, that is, the 72% recovery rate test of 12 membrane modules.

[0041] In some embodiments, the concentrate pipeline 12 is provided with a first return pipeline 14 for returning concentrate. One end of the first return pipeline 14 is connected to the concentrate pipeline 12 near the second test membrane assembly, and the other end of the first return pipeline 14 is connected to the inlet pipeline 3 near the outlet side of the first filter 4. The first return pipeline 14 is provided with a first return valve 15 for controlling the concentrate return flow rate, a flow meter 16 for monitoring the concentrate return flow rate, and a check valve 17 for preventing backflow. The check valve 17 can prevent the concentrate in the first return pipeline 14 from flowing back to the second test membrane assembly or the first test membrane assembly. Specifically, the concentrate is returned to the inlet pipeline 3 through the first return pipeline 14. The first return valve 15 can adjust the concentrate return flow rate and control the return ratio, thereby adjusting the inlet flow rate and inlet pressure of the inlet pipeline 3, realizing dynamic adjustment of the recovery rate of the reverse osmosis membrane assembly during the test.

[0042] In this embodiment, the pure water tank 11 is also provided with a second return pipe 18 for returning pure water. One end of the second return pipe 18 is connected to the pure water tank 11, and the other end of the second return pipe 18 is connected to the outlet side of the first pipe 5 near the first filter 4. The second return pipe 18 is provided with a second return valve 23 to control the return flow rate of pure water. The filtered pure water is returned to the first pipe 5 or the second pipe 6 through the second return pipe 18, which can perform a secondary desalination performance test on the filtered pure water. Specifically, the inlet pipe 3 is provided with a raw water valve 19 on the inlet side of the first filter 4 to control the opening and closing of the inlet pipe 3. When a secondary desalination performance test of pure water is required, the raw water valve 19 is closed, and the raw water tank 1 no longer supplies raw water. The second return pipe 18 is divided into the first branch 2. The first line 20 is connected to the inlet side of the first pipeline 5 near the high-pressure pump 7, and the second line 21 is connected to the inlet side of the second pipeline 6 near the high-pressure pump 7. Both the first line 20 and the second line 21 are equipped with control valves 22. By controlling the opening and closing of the first line 20 and the second line 21 through the control valves 22, the pure water in the second return pipeline 18 is controlled to flow into the first line 20 or the second line 21. The pure water enters the first pipeline 5 or the second pipeline 6, and after passing through the high-pressure pump 7, it re-enters the first test membrane group or the second test membrane group to realize the pure water secondary desalination performance test of the reverse osmosis membrane element. At the same time, the second return valve 23 can control the pure water return flow rate and can also achieve dynamic adjustment during the pure water secondary desalination performance test, so that the test system can meet the test requirements of higher desalination performance.

[0043] In one embodiment, such as Figure 2 As shown, the first test membrane assembly includes three first membrane housings 8, with three membrane units installed. The first valve assembly includes inlet valves e1, e2, and e3; concentrate diversion valves f1 and f2; concentrate discharge valves g1, g2, and g3; and pure water discharge valves h1, h2, and h3. When it is necessary to test the pure water secondary desalination performance of the membrane elements of the first test membrane assembly, the control valve 22 of the first path 20 of the second return pipeline 18 is opened, the control valve 22 of the second path 21 of the second return pipeline 18 is closed, the inlet valves e1, e2, and e3 are opened, the pure water discharge valves h1, h2, and h3 are opened, the concentrate diversion valves f1 and f2 are closed, and the concentrate discharge valves g1, g2, and g3 are closed. The pure water from the pure water tank 11 enters the first pipeline 5 through the first path 20 of the second return pipeline 18, and then enters the first test membrane assembly for the pure water secondary desalination performance test.

[0044] Furthermore, when it is necessary to test the secondary desalination performance of the membrane elements of the second test membrane group, the second test membrane group includes three second membrane housings 9, three membrane groups are installed, the control valve 22 of the second path 21 of the second return pipeline 18 is opened, the control valve 22 of the first path 20 of the second return pipeline 18 is closed, the inlet valves a1, a2, and a3 are opened, the pure water discharge valves d1, d2, and d3 are opened, the concentrate diversion valves b1 and b2 are closed, and the concentrate discharge valves c1, c2, c3, and c4 are closed. The pure water in the pure water tank 11 enters the second pipeline 6 through the second path 21 of the second return pipeline 18, and then enters the second test membrane group for the secondary desalination performance test of pure water.

[0045] In some embodiments, the reverse osmosis membrane element testing system further includes a cleaning pipeline 24. One end of the cleaning pipeline 24 is connected to the pure water pipeline 10 near the pure water tank 11, and the other end is connected to the second pipeline 6 near the inlet side of the second test membrane group. The cleaning pipeline 24 is sequentially equipped with a cleaning water tank 25, a cleaning pump 26, and a second filter 27. A control valve 22 for controlling the opening and closing of the cleaning pipeline 24 is provided on the inlet side of the cleaning water tank 25. The first pipeline 5 and the second pipeline 6 are connected by a connecting pipeline 33. The cleaning pump 26 pumps water from the cleaning water tank 25, which, after being filtered by the second filter 27, flows into the second test membrane group. The cleaning water is then diverted to the first test membrane group via the connecting pipeline 33 to simultaneously clean both the first and second test membrane groups. Specifically, when the control valve 22 of the cleaning pipeline 24 is opened, at least a portion of the filtered pure water flows into and is stored in the cleaning water tank 25 through the pure water pipeline 10. When the testing system needs cleaning, the cleaning pump... 26. Water from the cleaning tank 25 is pumped into the cleaning pipeline 24, filtered by the second filter 27, and then enters the second pipeline 6. The first pipeline 5 and the second pipeline 6 are connected by the connecting pipeline 33. A fifth valve 34 is installed on the connecting pipeline 33. Opening the fifth valve 34 opens all valves of the first and second test membrane groups, allowing the cleaning water flow to be diverted to both test membrane groups simultaneously. Closing the fifth valve 34 and opening all valves of the second test membrane group allows for cleaning of the second test membrane group alone. Opening the fifth valve 34, opening all valves of the first test membrane group, and closing the inlet valve a1 of the second test membrane group allows for cleaning of the first test membrane group alone. By integrating the cleaning function into the testing system, a high-efficiency cleaning membrane pore is built into the testing system. After testing, the membrane components can be automatically cleaned without disassembling them, avoiding secondary contamination or damage to the membrane elements, improving testing efficiency and the reusability of the testing system.

[0046] In this embodiment, the reverse osmosis membrane element testing system also includes a dosing device 2 disposed between the raw water tank 1 and the first filter 4, for adding scale inhibitor. The scale inhibitor added by the dosing device 2 can disperse the sparingly soluble inorganic salts in the raw water and prevent or interfere with the precipitation and scaling of the sparingly soluble inorganic salts on the metal surface. The raw water in the raw water tank 1 is filtered by the first filter 4 after the scale inhibitor is added by the dosing device 2, thereby reducing the impact of water quality on the test results.

[0047] In the above embodiment, the concentrate pipeline 12 is further provided with a first circulation pipeline 28. One end of the first circulation pipeline 28 is connected to the concentrate pipeline 12 near the concentrate tank 13, and the other end of the first circulation pipeline 28 is connected to the raw water tank 1. A third valve 29 is provided on the first circulation pipeline 28. The pure water pipeline 10 is further provided with a second circulation pipeline 30. One end of the second circulation pipeline 30 is connected to the pure water pipeline 10 near the pure water tank 11, and the other end of the second circulation pipeline 30 is connected to the raw water tank 1. A fourth valve 31 is provided on the second circulation pipeline 30. Specifically, the concentrate produced by the filtration of the first test membrane group and / or the second test membrane group can enter the concentrate pipeline. The water can be circulated from tank 13 or into raw water tank 1 via the first circulation pipe 28. The pure water filtered by the first test membrane group and / or the second test membrane group can enter pure water tank 11 or circulate into raw water tank 1 via the second circulation pipe 30. Since the test process of the reverse osmosis membrane element is long, the concentrated water and pure water can be returned to raw water tank 1 through the first circulation pipe 28 and the second circulation pipe 30, which can ensure the water flow circulation supply throughout the test process. At the same time, the first return pipe 14 can adjust the return flow rate to realize the dynamic adjustment function, which can simulate the operating parameters under different water quality and pressure conditions in actual working conditions, and improve the matching degree between the test results and the actual application scenario.

[0048] In this embodiment, both the first pipeline 5 and the second pipeline 6 are equipped with high-pressure pumps 7 for adjusting the inlet water flow. By setting high-pressure pumps 7 on the first pipeline 5 and the second pipeline 6 respectively, it is possible to perform high and low pressure alternating tests or composite pressure mode tests on the membrane element. At the same time, the two high-pressure pumps 7 can control the pressure of the water flow entering the first pipeline 5 and the second pipeline 6 respectively, which can simulate the operating parameters of the membrane element under different pressure conditions, thereby evaluating the performance degradation of the membrane element under complex pressure fluctuations and improving the flexibility of the test system.

[0049] In detail, both the first pipeline 5 and the second pipeline 6 are equipped with conductivity meters 32 on the inlet side of the high-pressure pump 7 to monitor the conductivity of the inlet water. The pure water pipeline 10 is equipped with a conductivity meter 32 to monitor the conductivity of the pure water and a flow meter 16 to monitor the flow rate of the pure water. The concentrate pipeline 12 is equipped with a flow meter 16 to monitor the flow rate of the concentrate and a pressure gauge to monitor the pressure of the concentrate. It can be understood that the desalination rate is calculated by monitoring the conductivity data of the inlet water and the conductivity data of the pure water. The flow meter 16 of the pure water pipeline 10 monitors the flow rate of the permeate water, and the flow meter 16 of the concentrate pipeline 12 monitors the flow rate of the concentrate water, so as to facilitate adjustment to achieve the permeate water flow rate and concentrate water flow rate required for the test. The pressure gauge of the concentrate pipeline 12 monitors the concentrate water pressure to ensure that the concentrate water pressure is within a suitable range, avoiding the concentrate water pressure being too low, which would reduce the amount of water molecules permeating the reverse osmosis membrane and affect the test results, and avoiding the concentrate water pressure being too high, which would damage the reverse osmosis membrane.

[0050] In the above embodiment, both the first pipeline 5 and the second pipeline 6 are provided with check valves 17 for preventing backflow. The check valves 17 are located on the outlet side of the first pipeline 5 and the second pipeline 6 near the high-pressure pump 7. By providing check valves 17 on the first pipeline 5 and the second pipeline 6, the check valves 17 can prevent concentrated water from flowing back to the high-pressure pump 7 when concentrated water flows back.

[0051] Example 1

[0052] The reverse osmosis membrane element testing system has a feed water flow rate of 5 tons / hour to simulate and test the desalination and water production performance of a 4-inch brackish water RO membrane module under a standard 15% recovery rate.

[0053] The inlet pressure of high-pressure pump 7 is set to 1.5 MPa, and the inlet flow rate is 5 m³ / s. 3 / h, feed water salt concentration 2000ppm (NaCl test solution), two 4040 reverse osmosis membrane elements are installed in the first membrane housing 8 of the first test membrane group to form two 4040 reverse osmosis membrane modules.

[0054] The 2000ppm test solution is initially filtered from the raw water tank 1 through the first filter 4, which has a filtration accuracy of 5μm. The inlet valve a1 of the second test membrane group and the fifth valve 34 of the connecting pipe 33 are closed. The inlet valve e1 of the first test membrane group is opened. The high-pressure pump 7 of the first pipe 5 pumps the test solution into the first test membrane group. The inlet valve e2 and the pure water discharge valve h1 are closed. The fourth valve 31 of the second circulation pipe 30 is closed. The pure water after testing and filtration enters the pure water tank 11 after the conductivity meter 32 and flow meter 16 on the pure water pipe 10 record the water quality. The concentrate discharge valve c4 of the second test membrane group is closed. The concentrate discharge valve g3 of the first test membrane group is opened. The first return valve 15 of the first return pipe 14 is closed. The third valve 29 of the first circulation pipe 28 is closed. The concentrate produced by filtration enters the concentrate tank 13 through the concentrate pipe 12.

[0055] The test system ran continuously for 24 hours, recording the stable water production and desalination rate at 30-minute intervals. The water production was 0.74 m³. 3 / h, recovery rate 14.8%, average desalination rate 99.48%.

[0056] Example 2

[0057] Pre-test preparation: Membrane housing arrangement: 4 eight-inch membrane housings, supporting series / parallel switching; Recovery rate adjustment: The first reflux valve 15 of the concentrate line 12 is adjustable from 0-100% opening; Dosing device 2: Scale inhibitor concentration of 2ppm, pH adjuster (±1.0 accuracy); Cleaning pump 26 is set to a cleaning water flow rate of 5m³ / h. 3 / h, pressure is 0.3MPa;

[0058] The inlet pressure of the high-pressure pump 7 is set to 1.5 MPa, and the inlet flow rate for low recovery rate is set to 20 m³ / h. 3 / h, feed water salt concentration 2000ppm (NaCl test solution), four 8040 reverse osmosis membrane elements are installed in the second membrane housing 9 of the second test membrane group to form four 8040 reverse osmosis membrane modules.

[0059] The prepared 2000ppm test solution is initially filtered from the raw water tank 1 through the first filter 4, which has a filtration accuracy of 5μm. The inlet valve e1 of the first test membrane group and the fifth valve 34 of the connecting pipe 33 are closed. The inlet valve a1 of the second test membrane group is opened, and the high-pressure pump 7 of the second pipe 6 pumps the test solution into the second test membrane group. The inlet valves a2 and a3 of the second test membrane group and the pure water discharge valves d1, d2, and d3 are opened. The concentrate diversion valves b1 and b2 of the second test membrane group are closed, and the second circulation pipe is opened. The fourth valve 31 of the pipeline 30 is closed, the inlet of the pure water tank 11 is closed, and the pure water after testing and filtration is circulated into the raw water tank 1 after the conductivity meter and flow meter 16 on the purified water pipeline record the quality of the produced water. The concentrated water discharge valve g3 of the first test membrane group is closed, the concentrated water discharge valve c4 of the second test membrane group is opened, the third valve 29 of the first circulation pipeline 28 is opened, the first return valve 15 of the first return pipeline 14 is closed, the inlet of the concentrated water tank 13 is closed, and the concentrated water produced by filtration is circulated into the raw water tank 1 through the first circulation pipeline 28.

[0060] After the test system ran continuously for 24 hours, the stable water production and desalination rate were recorded. The water production was 3.1 m³. 3 / h, recovery rate 15.5%, system average desalination rate 99.38%;

[0061] The inlet pressure of the high-pressure pump 7 is set to 1.5 MPa, and the low recovery rate flow rate is set to 12 m³ / s. 3 / h, feed water salt concentration 2000ppm (NaCl test solution), four 8040 reverse osmosis membrane elements are installed in the second membrane housing 9 of the second test membrane group to form four 8040 reverse osmosis membrane modules.

[0062] The prepared 2000ppm test solution is initially filtered from the raw water tank 1 through the first filter 4, which has a filtration accuracy of 5μm. The inlet valve e1 of the first test membrane group and the fifth valve 34 of the connecting pipeline 33 are closed. The inlet valve a1 of the second test membrane group is opened, and the high-pressure pump 7 of the second pipeline 6 pumps the test solution into the second test membrane group. The inlet valves a2, a3, and a4 of the second test membrane group are closed. The concentrate diversion valves b1, b2, and b3 and the pure water discharge valves d1, d2, and d3 of the second test membrane group are opened. The fourth valve 31 of the second circulation pipeline 30 is opened. Close the inlet of the pure water tank 11. After the filtered pure water is tested, the conductivity meter and flow meter 16 on the pure water pipeline 10 record the quality of the produced water and then circulate it into the raw water tank 1. Close the concentrate discharge valve g3 of the first test membrane group and open the concentrate discharge valve c4 of the second test membrane group. Open the first return valve 15 of the first return pipeline 14 and the third valve 29 of the first circulation pipeline 28. Close the inlet of the concentrate tank 13. The concentrate produced by filtration is divided into two parts. Part of it flows back to the second pipeline 6 through the first return pipeline 14, and the other part flows into the raw water tank 1 through the first circulation pipeline 28.

[0063] The test system ran continuously for 24 hours, recording the stable water production and desalination rate at 30-minute intervals. The water production was 4.82 m³. 3 / h, recovery rate 74.6%, concentrate reflux ratio 77.3%, system average desalination rate 98.3%.

[0064] Example 3

[0065] The reverse osmosis membrane element testing system has a feed water flow rate of 15 tons / hour to simulate and test the secondary desalination and permeate performance of a 4-inch RO membrane module under a standard 15% recovery rate.

[0066] The inlet pressure of high-pressure pump 7 is set to 1.5 MPa, and the inlet flow rate is set to 15 m³ / s. 3 / h, feed water salt concentration 2000ppm (NaCl test solution), two 8040 reverse osmosis membrane elements are installed in the second membrane housing 9 of the second test membrane group to form two 8040 reverse osmosis membrane modules.

[0067] The 2000ppm test solution is initially filtered from the raw water tank 1 through the first filter 4, which has a filtration accuracy of 5μm. The inlet valve e1 of the first test membrane group and the fifth valve 34 of the connecting pipe 33 are closed. The inlet valve a1 of the second test membrane group is opened. The high-pressure pump 7 of the second pipe 6 pumps the test solution into the second test membrane group. The inlet valve e2 and the pure water discharge valve h1 are closed. The fourth valve 31 of the second circulation pipe 30 is closed. The pure water after filtration is recorded by the conductivity meter and flow meter 16 on the pure water pipe 10 and then enters the pure water tank 11. The concentrate discharge valve c4 of the second test membrane group is closed. The concentrate discharge valve g3 of the first test membrane group is opened. The first return valve 15 of the first return pipe 14 is closed. The third valve 29 of the first circulation pipe 28 is closed. The concentrate produced by filtration enters the concentrate tank 13 through the concentrate pipe 12.

[0068] Close the raw water valve 19, and the test solution will no longer enter the raw water tank 1. Open the second return valve 23 of the second return pipeline 18 and the control valve 22 of the first path 20 of the second return pipeline 18. Close the control valve 22 of the second path 21 of the second return pipeline 18. Start the high-pressure pump 7 of the first pipeline 5. Adjust the opening of the inlet valve e1 of the first test membrane group to make the inlet flow rate 3.6m³. 3With an inlet water pressure of 1.03 MPa, open the inlet valves e2 and e3 of the first test membrane group, open the pure water discharge valves h1, h2, and h3 of the first test membrane group, close the fifth valve 34 of connecting pipe 33 and the concentrate flow valves f1 and f2 of the first test membrane group, open the concentrate discharge valves g1, g2, and g3 of the first test membrane group, close the concentrate discharge valve c4 of the second test membrane group, and adjust the opening degree of the concentrate discharge valve g3 of the first test membrane group to 82%, so that the concentrate flow rate is 3.05 m³ / h. 3 / h, pure water flow rate reaches 0.54m³ / h. 3 The test system runs continuously for 24 hours, recording the pressure of the influent and concentrate, and the conductivity of the influent and product water at 30-minute intervals.

[0069] In summary, the reverse osmosis membrane element testing system provided by this utility model, by setting up a first test membrane group and a second test membrane group, when conducting reverse osmosis membrane element testing, membrane elements of different sizes are installed in the first test membrane group and the second test membrane group respectively. This not only enables the testing of membrane elements of different sizes under the same water quality conditions, but also enables the testing of multiple reverse osmosis membrane elements by adjusting the number of membrane elements in the first test membrane group or the second test membrane group, thereby improving the adaptability of reverse osmosis membrane equipment.

[0070] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A reverse osmosis membrane element testing system, characterized in that, include: Raw water tank, used to supply raw water; The first filter is connected to the raw water tank through an inlet pipe and is used to perform initial filtration of the raw water. The inlet pipe is divided into a first pipe and a second pipe on the outlet side of the first filter. The first test membrane assembly is connected to the first pipeline and is used to install the reverse osmosis membrane; The second test membrane group is connected to the second pipeline and is arranged in parallel with the first test membrane group for installing reverse osmosis membranes; The first pipeline and the second pipeline converge at the outlet side of the first test membrane group and the second test membrane group and then split into a pure water pipeline and a concentrated water pipeline. The end of the pure water pipeline is provided with a pure water tank for collecting pure water, and the end of the concentrated water pipeline is provided with a concentrated water tank for collecting the concentrated water produced by filtration. Membrane elements of different sizes are respectively installed in the first test membrane group and the second test membrane group; the first test membrane group includes multiple first membrane housings for installing reverse osmosis membranes, which are connected to each other through a third pipeline, and the multiple first membrane housings are connected in series or in parallel; the second test membrane group includes multiple second membrane housings for installing reverse osmosis membranes, which are connected to each other through a fourth pipeline, and the multiple second membrane housings are connected in series or in parallel; the first membrane housings and the second membrane housings have different sizes.

2. The reverse osmosis membrane element testing system according to claim 1, characterized in that, A first valve assembly is provided on the third pipeline between adjacent first membrane shells. By controlling the opening and closing of the first valve assembly, multiple first membrane shells can be connected in series or in parallel. A second valve assembly is provided on the fourth pipeline between adjacent second membrane shells. By controlling the opening and closing of the second valve assembly, multiple second membrane shells can be connected in series or in parallel.

3. The reverse osmosis membrane element testing system according to claim 1, characterized in that, The concentrate pipeline is provided with a first return pipeline for returning concentrate. One end of the first return pipeline is connected to the concentrate pipeline near the second test membrane assembly, and the other end of the first return pipeline is connected to the inlet pipeline near the outlet side of the first filter. The first return pipeline is provided with a first return valve for controlling the concentrate return flow rate, a flow meter for monitoring the concentrate return flow rate, and a check valve for preventing backflow.

4. The reverse osmosis membrane element testing system according to claim 1, characterized in that, The pure water tank is also equipped with a second return pipeline for returning pure water. One end of the second return pipeline is connected to the pure water tank, and the other end of the second return pipeline is connected to the outlet side of the first pipeline near the first filter. A second return valve is provided on the second return pipeline to control the return flow rate of pure water.

5. The reverse osmosis membrane element testing system according to claim 1, characterized in that, It also includes a cleaning pipeline, one end of which is connected to the pure water pipeline near the pure water tank, and the other end of which is connected to the second pipeline near the inlet side of the second test membrane group. The cleaning pipeline is provided with a cleaning water tank, a cleaning pump, and a second filter in sequence. The first pipeline and the second pipeline are connected by a connecting pipeline. The cleaning pump pumps water out of the cleaning water tank, and after being filtered by the second filter, the cleaning water flows into the second test membrane group. The cleaning water flow is diverted to the first test membrane group through the connecting pipeline so as to clean the first test membrane group and the second test membrane group simultaneously.

6. The reverse osmosis membrane element testing system according to claim 1, characterized in that, It also includes a dosing device disposed between the raw water tank and the first filter for adding scale inhibitor.

7. The reverse osmosis membrane element testing system according to claim 1, characterized in that, The concentrate pipeline is also equipped with a first circulation pipeline. One end of the first circulation pipeline is connected to the concentrate pipeline near the concentrate tank, and the other end of the first circulation pipeline is connected to the raw water tank. The first circulation pipeline is equipped with a third valve. The pure water pipeline is also equipped with a second circulation pipeline. One end of the second circulation pipeline is connected to the pure water pipeline near the pure water tank, and the other end of the second circulation pipeline is connected to the raw water tank. The second circulation pipeline is equipped with a fourth valve.

8. The reverse osmosis membrane element testing system according to claim 1, characterized in that, Both the first pipeline and the second pipeline are equipped with high-pressure pumps for regulating the inlet water flow.

9. The reverse osmosis membrane element testing system according to claim 8, characterized in that, Both the first pipeline and the second pipeline are equipped with check valves to prevent backflow. The check valves are located on the outlet side of the first pipeline and the second pipeline near the high-pressure pump.

10. The reverse osmosis membrane element testing system according to claim 1, characterized in that, The pure water pipeline is equipped with a conductivity meter for monitoring the conductivity of pure water and a flow meter for monitoring the flow rate of pure water. The concentrated water pipeline is equipped with a flow meter for monitoring the flow rate of concentrated water and a pressure gauge for monitoring the pressure of concentrated water.

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