Apparatus and method for testing the impact resistance of industrial membrane elements

Abstract

The application provides a device and a test method for impact resistance test of an industrial membrane element, and belongs to the technical field of water treatment. The device comprises a raw material liquid system, a temperature adjusting system, an impact test system, a reverse osmosis membrane system, a bypass pipe system and a control system. The temperature adjusting system comprises a cold water supply device and a heat exchange device. The impact test system comprises a water inlet pump, a high-pressure pump and a timing start-stop device. The reverse osmosis membrane system comprises a plurality of membrane shells, and an industrial membrane element is installed in each membrane shell. The bypass pipe system comprises a bypass pipe, a booster pump and a plurality of valves. The application can test the impact resistance of the industrial membrane element, find out the possible weak points and the service life of the industrial membrane element under impact conditions before the industrial membrane element is delivered, so as to improve the user experience by upgrading or slowing down the failure rate of the industrial membrane element.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water treatment, in particular to the technical field of performance testing of water treatment equipment, and especially to a device and method for testing the impact resistance of industrial membrane elements. BACKGROUND

[0002] Industrial membrane technology has the advantages of high separation efficiency, low cost and environmental friendliness, and is widely used in various industrial fields. Industrial membrane elements, such as reverse osmosis membrane elements, are not only widely used in traditional seawater and brackish water desalination industries, but also widely used in special industrial fields such as pure water preparation, wastewater treatment and material separation and concentration.

[0003] Currently, in the prior art, reverse osmosis membranes are used in large quantities in systems arranged in a specific ratio. These systems have a large amount of membrane stacks and long water flow processes, requiring large water supply pumps and high-pressure pumps to provide sufficient water pressure. In addition, some users may ignore the high-pressure pump frequency converter during system design and actual use. Starting the raw water pump to fill the pipeline and then suddenly increasing the pressure may not cause water hammer phenomenon to damage the reverse osmosis membrane, but the sudden impact of the liquid on the reverse osmosis membrane may cause the reverse osmosis membrane to appear compacted, back pressure, telescope phenomenon, glass steel burst and other faults, affecting the normal use of the system.

[0004] Therefore, in order to find out the possible weak points of the industrial membrane elements before they are shipped and their service life under impact conditions, so as to upgrade or slow down the failure rate of the industrial membrane elements in advance, and improve the user experience, it is necessary to test the impact resistance of the industrial membrane elements. A device and method for testing the impact resistance of industrial membrane elements are needed to test the impact resistance of the industrial membrane elements. SUMMARY

[0005] The present application provides a device and method for testing the impact resistance of industrial membrane elements, which can test the impact resistance of industrial membrane elements, find out the possible weak points of the industrial membrane elements before they are shipped and their service life under impact conditions, so as to upgrade or slow down the failure rate of the industrial membrane elements in advance, and improve the user experience.

[0006] In a first aspect, the present application provides a device for testing the impact resistance of industrial membrane elements, comprising: a raw material liquid system, a temperature adjusting system, an impact testing system, a reverse osmosis membrane system, a bypass pipe system and a control system;

[0007] The temperature adjusting system comprises a cold water supply device and a heat exchange device, the impact testing system comprises a water inlet pump, a high-pressure pump and a timing start-stop device, the reverse osmosis membrane system comprises a plurality of membrane shells, the membrane shells are installed with industrial membrane elements, and the bypass pipe system comprises a bypass pipe, a booster pump and a plurality of valves.

[0008] The raw material liquid system is communicated with the water inlet pump through a first pipeline, the water inlet pump is communicated with the heat exchange device through a second pipeline, the heat exchange device is communicated with the cold water liquid supply device through a third pipeline, the heat exchange device is communicated with the high-pressure pump through a fourth pipeline, the high-pressure pump is communicated with the plurality of membrane shells through a fifth pipeline, the high-pressure pump is communicated with the booster pump through the bypass pipeline, the plurality of membrane shells are each communicated with the raw material liquid system through a sixth pipeline, the membrane shell is further communicated with the raw material liquid system through a seventh pipeline, the seventh pipeline is communicated with the booster pump through the bypass pipeline; the first pipeline is provided with a first conductivity detection device, the fourth pipeline is provided with a first flow detection device, the fifth pipeline is provided with a pressure detection device, the sixth pipeline and the passage of each membrane shell are each provided with a second conductivity detection device and a second flow detection device, the seventh pipeline is provided with a concentrated water adjusting valve, the plurality of valves are installed on the bypass pipeline at positions on both sides of the booster pump, and the bypass pipeline and the passage of each membrane shell are each provided with a third flow detection device.

[0009] The control system is electrically connected with the temperature adjusting system, the impact test system, the reverse osmosis membrane system, the bypass pipeline system, the pressure detection device, the first flow detection device, the second flow detection device, the third flow detection device, the first conductivity detection device and the second conductivity detection device.

[0010] In a possible implementation manner, the control system comprises a controller and a start-stop device; the controller is electrically connected with the start-stop device, the water inlet pump, the cold water liquid supply device, the heat exchange device, the high-pressure pump, the timing start-stop device, the booster pump, the plurality of valves, the pressure detection device, the first flow detection device, the second flow detection device, the third flow detection device, the first conductivity detection device and the second conductivity detection device. The start-stop device is used to set the start-stop times for the raw material liquid system, the temperature adjusting system, the impact test system, the reverse osmosis membrane system and the bypass pipeline system.

[0011] In a possible implementation manner, the timing start-stop device is a time control switch, and the time control switch is used to start and stop the water inlet pump and the high-pressure pump according to pre-stored start-stop time data.

[0012] In a second aspect, the application provides a test method using the device for testing the impact resistance of an industrial membrane element described in the first aspect, applied to the control system in the device, and the method comprises the following steps:

[0013] Controlling the water inlet pump to be turned on, so that the test solution in the device flows in a cycle according to a preset cycle time length;

[0014] Controlling the plurality of valves on the bypass pipeline and the booster pump to be started and run within the preset cycle time length.

[0015] controlling the temperature regulation system to regulate the temperature of the test solution to a preset temperature for a preset cycle length;

[0016] controlling the high-pressure pump to be turned on to adjust the test pressure to a preset pressure and maintain the preset test length, the test pressure being collected in real time by the pressure detection device, the first test flow data being obtained in real time from the first flow detection device, the third flow detection device, the second test flow data being obtained in real time from the second flow detection device, and the test conductivity data being obtained in real time from the first conductivity detection device and the second conductivity detection device, to generate an initial performance test result;

[0017] controlling the opening degree of the concentrated water regulating valve to change based on the first test flow data, so that the proportion of concentrated water outflow and concentrated water backflow is within a preset concentrated water flow proportion interval;

[0018] adjusting the timing start-stop device to set the start-stop time interval of the water inlet pump and the high-pressure pump to a preset start-stop interval threshold, and starting the timing start-stop device to control the start-stop of the water inlet pump and the high-pressure pump according to the preset start-stop interval threshold to complete a start-stop cycle;

[0019] when the number of start-stop cycles is detected to reach a preset cycle number, the timing start-stop device is controlled to be turned off; and based on the test conductivity data and the second test flow data, an end-point performance test result of the industrial membrane element installed in the membrane shell is determined.

[0020] In a possible implementation, the second test flow data is obtained in real time from the second flow detection device, and the test conductivity data is obtained in real time from the first conductivity detection device and the second conductivity detection device to generate an initial performance test result, which includes: obtaining the second test flow data in real time from the second flow detection device, and determining an initial water production flow based on the second test flow data; obtaining the test conductivity data in real time from the first conductivity detection device and the second conductivity detection device, and determining an initial desalination rate based on the conductivity data; when the initial water production flow is detected to be within a preset standard initial water production flow range and the initial desalination rate is greater than a preset initial desalination rate threshold, an initial performance test result indicating that the initial performance is qualified is generated.

[0021] In a possible implementation, the test conductivity data includes water inlet conductivity data collected by the first conductivity detection device in real time and water outlet conductivity data collected by the second conductivity detection device in real time, and the second test flow data includes initial water outlet flow data collected by the second flow detection device in real time and end-point water outlet flow data; accordingly, the method of determining the end-point performance test result of the industrial membrane element installed in the membrane shell according to the test conductivity and the test flow data includes: determining a desalination rate value according to the water inlet conductivity data and the water outlet conductivity data; and when it is detected that the desalination rate value is lower than a preset desalination rate threshold and / or the end-point water outlet flow data is greater than the initial water outlet flow data, generating the end-point performance test result of the industrial membrane element.

[0022] In a possible implementation, the calculation formula of determining the desalination rate value according to the water inlet conductivity data and the water outlet conductivity data is as follows:

[0023]

[0024] In the formula, SRR is the desalination rate value, Out is a value in the water outlet conductivity data, and In is a value in the water inlet conductivity data.

[0025] In a possible implementation, the preset start-stop interval threshold includes a first preset start-stop interval threshold from starting to stopping and a second preset start-stop interval threshold from the last time of stopping to starting again; accordingly, the method of controlling the start and stop of the water inlet pump and the high-pressure pump according to the preset start-stop interval threshold includes: controlling the start and stop of the water inlet pump and the high-pressure pump from starting to stopping according to the first preset start-stop interval threshold; and controlling the start and stop of the water inlet pump and the high-pressure pump from the last time of stopping to starting again according to the second preset start-stop interval threshold.

[0026] In a possible implementation, the preset cycle length is in a range of 1 to 60 minutes, the preset temperature is in a range of 10 to 30 degrees Celsius, the preset pressure is in a range of 0.5 to 4.1 MPa, the first preset start-stop time interval is in a range of 0.1 to 1 hour, the preset cycle number is in a range of 200 to 20,000 times, the first preset start-stop interval threshold is in a range of 5 minutes to 10 hours, and the second preset start-stop interval threshold is in a range of 10 seconds to 1 hour.

[0027] In a possible implementation, the method further includes: determining a reverse osmosis membrane flux decline amplitude according to the initial water outlet flow data and the end-point water outlet flow data, and performing display processing on the reverse osmosis membrane flux decline amplitude, so that a user can improve the product according to the reverse osmosis membrane flux decline amplitude.

[0028] The application provides a device and a test method for testing the impact resistance of an industrial membrane element. The device can be used for testing the impact resistance of the industrial membrane element. During the test, the device can increase the flow through the industrial membrane element while keeping the pressure unchanged. When multiple membrane housings are tested in parallel, the device can balance the flow and the pressure, improve the test accuracy, test multiple industrial membrane elements at one time, reduce the cost of testing multiple reverse osmosis membranes, improve the work efficiency, reduce the labor intensity, and overcome the problem of insufficient flow when multiple membrane housings are tested in parallel without increasing the number and power of high-pressure pumps. The existence of the super tube system greatly reduces the test cost when multiple industrial membrane elements are tested for impact resistance at the same time. The device provides a perfect basis for the production and improvement of industrial membrane elements. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative labor.

[0030] Figure 1 The overall connection structure schematic diagram of the device for testing the impact resistance of an industrial membrane element provided by the embodiments of the application is shown in the figure.

[0031] Figure 2 The flowchart of the test method for testing the impact resistance of an industrial membrane element provided by the embodiments of the application is shown in the figure.

[0032] Reference signs:

[0033] 1-raw material liquid system; 101-first pipeline; 102-first conductivity detection device; 103-maintenance valve;

[0034] 2-temperature adjustment system; 21-cold water supply device; 22-heat exchange device; 201-third pipeline; 202-fourth pipeline; 203-first flow detection device;

[0035] 3-impact test system; 31-water inlet pump; 32-high-pressure pump; 33-timed start-stop device; 301-second pipeline; 302-fifth pipeline; 303-pressure detection device;

[0036] 4-reverse osmosis membrane system; 41-membrane housing; 401-sixth pipeline; 402-seventh pipeline; 403-second conductivity detection device; 404-second flow detection device; 405-concentrated water adjustment valve; 406-third flow detection device;

[0037] 5 - bypass pipe system; 51 - bypass pipe; 52 - booster pump; 53 - valve;

[0038] 6 - control system; 61 - controller; 62 - start-stop device. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0040] At present, the inventor finds that the range of the water inflow of the reverse osmosis membrane is wide, which can reach 2 to 19 m3 / h, and the test pressure is between 0.5 to 2.5 MPa. When multiple membrane shells are tested in parallel, it is difficult to balance the flow and pressure. If good test results are to be achieved, a very high test cost needs to be spent. Therefore, how to increase the flow under the condition of constant pressure, reduce the cost and the number of tests, improve the work efficiency, reduce the work intensity of the detection personnel, and ensure the stability of the detection rate and the product quality, has become a problem to be solved by the present application.

[0041] To solve the above technical problems, the embodiments of the present application provide the following technical concepts for solving the problems: through the cooperation of the equipment for testing the impact resistance of the membrane element and the test method for the impact resistance, the to-be-tested liquid intermittently impacts the industrial membrane element at high pressure, the use conditions under the system conditions can be simulated under the laboratory conditions, the strength and service life of the production process and materials such as the glue line of the membrane element, the surface of the membrane sheet, the thick net, the thin net, and the glass fiber after long-term use are verified at one time through multiple impacts, the defects of the industrial membrane element after long-term operation are exposed early, the product can be improved before leaving the factory, and the product competitiveness is enhanced. Meanwhile, the test equipment provided by the present application can test multiple industrial membrane elements in parallel at the same time through the design of the bypass pipe and the booster pump, which reduces the equipment cost, improves the work efficiency, reduces the work intensity of the detection personnel, and ensures the stability of the detection rate and the product quality.

[0042] It should be noted that the description of the connection, connection or front end, rear end and the like in the embodiments of the present application is intended to facilitate the understanding of the specific content in the embodiments of the present application, and is not a limitation on the technical solutions of the present application. For example: the connection includes the direct connection of two devices through the threaded connection or welding of the pipeline interface, and the connection can be achieved by means of electrical connection or communication connection to realize the function of transmitting data and control instructions.

[0043] Figure 1The overall connection structure diagram of the device for testing the impact resistance of industrial membrane elements provided by the embodiments of the present application is shown in the figure.

[0044] Referring to Figure 1 , the device for testing the impact resistance of industrial membrane elements comprises a raw liquid system 1, a temperature adjusting system 2, an impact testing system 3, a reverse osmosis membrane system 4, a bypass pipe system 5 and a control system 6.

[0045] Referring to Figure 1 , the temperature adjusting system 2 comprises a cold water supply device 21 and a heat exchange device 22, the impact testing system 3 comprises a water inlet pump 31, a high-pressure pump 32 and a timing start-stop device 33, the reverse osmosis membrane system 4 comprises a plurality of membrane housings 41, the membrane housings 41 are installed with industrial membrane elements, and the bypass pipe system 5 comprises a bypass pipe 51, a booster pump 52 and a plurality of valves 53.

[0046] Referring to Figure 1 , the raw liquid system 1 is communicated with the water inlet pump 31 through a first pipe 101, the water inlet pump 31 is communicated with the heat exchange device 22 through a second pipe 301, the heat exchange device 22 is communicated with the cold water supply device 21 through a third pipe 201, the heat exchange device 22 is communicated with the high-pressure pump 32 through a fourth pipe 202, the high-pressure pump 32 is communicated with the plurality of membrane housings 41 through a fifth pipe 302, the high-pressure pump 32 is communicated with the booster pump 52 through the bypass pipe 51, the plurality of membrane housings 41 are all communicated with the raw liquid system 1 through a sixth pipe 401, the membrane housings 41 are also communicated with the raw liquid system 1 through a seventh pipe 402, the seventh pipe 402 is communicated with the booster pump 52 through the bypass pipe 51; the first pipe 101 is provided with a first conductivity detection device 102, the fourth pipe 202 is provided with a first flow detection device 203, the fifth pipe 302 is provided with a pressure detection device 303, the sixth pipe 401 and the passage of each membrane housing 41 are provided with a second conductivity detection device 403 and a second flow detection device 404, the seventh pipe 402 is provided with a concentrated water adjusting valve 405, the plurality of valves 53 are installed on the bypass pipe 51 at positions on both sides of the booster pump 52, and the seventh pipe 402 and the passage of each membrane housing are provided with a third flow detection device 406.

[0047] Referring to Figure 1 , the control system 6 is electrically connected with the temperature adjusting system 2, the impact testing system 3, the reverse osmosis membrane system 4, the bypass pipe system 5, the pressure detection device 303, the first flow detection device 203, the second flow detection device 404, the third flow detection device 406, the first conductivity detection device 102 and the second conductivity detection device 403.

[0048] Referring to Figure 1The control system 6 comprises a controller 61 and a start-stop device 62; the controller 61 is electrically connected with the start-stop device 62, the water inlet pump 31, the cold water supply device 21, the heat exchange device 22, the high-pressure pump 32, the timing start-stop device 33, the booster pump 52, the plurality of valves 53, the pressure detection device 303, the first flow detection device 203, the second flow detection device 404, the third flow detection device 406, the first conductivity detection device 102 and the second conductivity detection device 403. The start-stop device 62 is used to set the start-stop times of the raw material liquid system 1, the temperature adjustment system 2, the impact test system 3, the reverse osmosis membrane system 4 and the bypass pipe system 5.

[0049] The following will be described in combination with Figure 1 The flow direction of the test solution is as shown by the arrow in Figure 1 .

[0050] As shown in Figure 1 , in the embodiment, the raw material liquid system 1 can be a container for containing the test solution, for example, the container can be a raw water tank or a raw water barrel. In an optional embodiment of the present application, a maintenance valve 103 is further arranged on the first pipeline 101 in communication with the raw material liquid system 1. When the entire device needs to stop running, the entire device can be stopped circulating by controlling the maintenance valve 103, so as to facilitate the operation of maintenance, maintenance, test or cleaning of the device.

[0051] In the embodiment, the first conductivity detection device 102 on the first pipeline 101 can be a conductivity meter, which is used to detect the water inlet conductivity of the test solution flowing from the first pipeline 101 and send the collected water inlet conductivity to the control system 6. In the embodiment, the maintenance valve 103 can be an electrically controlled valve, and when the device for testing the impact resistance of the industrial membrane element needs to stop running, the control system 6 can send a control instruction to the maintenance valve 103 to make the maintenance valve 103 close.

[0052] In the embodiment, the cold water supply device 21 in the temperature adjustment system 2 can be a machine capable of providing cold water for the heat exchange device 22, for example, the cold water supply device 21 can be a cold water machine. The heat exchange device 22 can be an assembly capable of reducing the temperature of the test solution flowing from the heat exchange device 22, for example, the heat exchange device 22 can be a plate heat exchanger, a coil heat exchanger, a tube heat exchanger. It is known from the practice of the inventor that the tube heat exchanger has better effect. In an optional embodiment of the present application, the heat exchange device 22 adopts the tube heat exchanger. The first flow detection device 203 can be an instrument capable of detecting the flow in unit time from the fourth pipeline 202, for example, the first flow detection device 203 can be a flow meter.

[0053] Please continue to refer to Figure 1In this embodiment, the feed water pump 31 in the impact test system 3 is used to deliver the test solution from the raw material liquid system 1 to the heat exchange device 22, and the high-pressure pump 32 is used to provide liquid pressure, so that the liquid pressure in the fourth pipeline 202 is less than the liquid pressure in the fifth pipeline 302. The timing start-stop device 33 can be a switch or a control element that can control the start-stop of the feed water pump 31 and the high-pressure pump 32, for example: the timing start-stop device 33 can be a timing switch or a start-stop instruction sending module connected to a PLC controller, etc. The pressure detection device 303 can be an instrument that can detect the fluid pressure in the fifth pipeline 302, for example: the pressure detection device 303 can include but not limited to a digital pressure gauge, an electric contact pressure gauge, a pressure difference meter and a pressure recorder.

[0054] Please continue to refer to Figure 1 The membrane shell 41 in the reverse osmosis membrane system 4 is a sealed shell for installing the industrial membrane element to be tested. In an optional embodiment of the present application, the shell can be made of glass fiber reinforced plastic or stainless steel. Each membrane shell 41 can accommodate at least one industrial membrane element. In this example, the number of industrial membrane elements in the membrane shell 41 is 2. The number of membrane shells 41 is multiple, and multiple membrane shells 41 can be connected in series or in parallel. In this embodiment, the number of membrane shells 41 is 3, and the three modules 41 are arranged in parallel.

[0055] The second conductivity detection device 403 can be a conductivity meter, which is used to detect the product water conductivity of the test solution flowing from the sixth pipeline 401 and send the collected product water conductivity to the control system 6. The second flow detection device 404 and the third detection device 406 can use the same instrument as the first flow detection device 203. The second flow detection device 404 is used to detect the flow rate per unit time from the sixth pipeline 401. The third flow detection device 406 is used to detect the flow rate per unit time from the seventh pipeline 402.

[0056] In this embodiment, the concentrated water regulating valve 405 can be an electric regulating valve, which can be used to adjust the proportion of concentrated water outflow and concentrated water backflow.

[0057] Please continue to refer to Figure 1In the embodiment, the function of the bypass pipe system 5 is to return the concentrated water after the membrane shell 41 to the front end of the membrane shell 41, so as to increase the flow of the fluid output by the high-pressure pump 32. Since the pressure drop in the module 41 is small, such as ≤0.5 bar, the booster pump 52 does not need to select a high-pressure and high-power pump body to meet the requirements, and the flow of the returned concentrated water can reach several times, generally 1 to 5 times, of the water inlet flow. At the same time, the existence of the bypass pipe system 5 can also make the test solution continuously impact the industrial membrane element in the membrane shell 41, so as to enhance the impact. In the embodiment, the booster pump 52 can be a water pump with a lift range of 0.1 to 4.1 Mpa. For example, in the practice of the inventor, the lift of the booster pump 52 is 0.5 to 1.55 Mpa.

[0058] In the embodiment, the valve 53 can be an electrically controlled valve. In the embodiment, the number of the valve 53 is two. One valve 53 is installed on the bypass pipe 51 between the booster pump 52 and the outlet of the membrane shell 41, and the other valve 53 is installed on the bypass pipe 51 between the booster pump 52 and the fifth pipeline 302 connected with the high-pressure pump 32.

[0059] In the embodiment, the controller 61 in the control system 6 can be a device or a chip that can receive data and process the data to obtain the test results of the performance and impact resistance. For example, the controller 61 can be a PLC controller.

[0060] In summary, the device for testing the impact resistance of the industrial membrane element provided in the embodiment of the application can be used by the user to test the impact resistance of the industrial membrane element. During the test, the entire device can increase the flow through the industrial membrane element under the condition that the pressure is unchanged, and can balance the flow and the pressure when multiple membrane shells 41 are tested in parallel, so as to improve the test accuracy, test multiple industrial membrane elements at one time, reduce the cost of testing multiple reverse osmosis membranes, improve the work efficiency, and reduce the work intensity of the artificial. The existence of the bypass pipe system 5 solves the problem of insufficient flow when multiple membrane shells 41 are tested in parallel without increasing the number and power of the high-pressure pump, greatly reduces the test cost when multiple industrial membrane elements are tested for impact resistance at the same time, and provides a perfect basis for the production and improvement of the industrial membrane element.

[0061] In an optional embodiment of the application, a device for testing the impact resistance of an industrial membrane element is also provided. The difference between the device and the above-mentioned embodiment is that the device can not include the control system 6, that is, the test is only manually operated.

[0062] Figure 2 The flowchart of the method for testing the impact resistance of the industrial membrane element provided in the embodiment of the application is shown.

[0063] The embodiment of the present application provides a method for testing the impact resistance of an industrial membrane element, which uses the device for testing the impact resistance of the industrial membrane element as shown in Figure 1 The embodiment described above can be used for testing the impact resistance of the industrial membrane element, and the execution subject of the testing method can be Figure 1 The control system 6 in the embodiment can also be other computer-related devices, and the embodiment is not particularly limited.

[0064] As shown in Figure 2 The method comprises the following steps.

[0065] S201: The water inlet pump 31 is controlled to be started, so that the test solution in the device flows in a preset circulation time length.

[0066] In the embodiment, the test solution can be a pre-configured conductive solution. Before step S201 is performed, the industrial membrane element needs to be manually installed into the membrane shell 41, and the test solution also needs to be manually configured and poured into the raw material system.

[0067] In an optional embodiment of the present application, the test solution is a 2000±25ppm sodium chloride solution. For example, the test solution configured by the inventor during testing can be a 1975ppm sodium chloride solution, a 2025ppm sodium chloride solution, or a 2000ppm sodium chloride solution.

[0068] Please refer to Figure 1 and Figure 2 In the embodiment, the control system 6 sends a control instruction to the water inlet pump 31 to start the water inlet pump 31. In the embodiment, after the water inlet pump 31 is started, the air in the pipelines for the test solution to flow in the entire device, such as the first pipeline 101, the second pipeline 301, and the bypass pipeline 51, is discharged as the test solution flows. The preset circulation time length can be a preset time for the test solution to flow in the entire device. In an optional embodiment of the present application, the preset circulation time length ranges from 1 minute to 60 minutes. For example, the preset circulation time length can be 1 minute, 45 minutes, or 60 minutes.

[0069] In an optional embodiment of the present application, the preset circulation time length ranges from 5 minutes to 10 minutes.

[0070] S202: The multiple valves 53 and the booster pump 52 on the bypass pipeline 51 are controlled to be started and run in the preset circulation time length.

[0071] In the embodiment, the control system 6 sends a control instruction to the multiple valves 53 and the booster pump 52 on the bypass pipeline 51, so that the valves 53 and the booster pump 52 are opened and kept running in the preset circulation time length, to increase the flow of the test solution into the membrane shell 41.

[0072] S203: controlling the temperature adjustment system 2 to adjust the temperature of the test solution to a preset temperature within a preset cycle length.

[0073] In this embodiment, the heat exchange device 22 in the temperature adjustment system 2 is controlled to exchange heat between the test solution and the fluid in the cold water supply device 21, so as to adjust the temperature of the test solution to the preset temperature. In this embodiment, the preset temperature can be a constant temperature that can complete the impact resistance test of the industrial membrane element. In an optional embodiment of the present application, the preset temperature is in the range of 10-30°C. For example, the preset temperature can be 10°C, 20°C or 30°C. According to the inventor's practice, it is more beneficial to improve the test efficiency and test accuracy when the preset temperature is set to 20-25°C.

[0074] S204: controlling the high-pressure pump 32 to be turned on, so as to adjust the test pressure to a preset pressure and maintain the preset test length. The test pressure is obtained by real-time collection by the pressure detection device 303, and the first test flow data is obtained by real-time acquisition by the first flow detection device 203 and the third flow detection device 406, the second test flow data is obtained by real-time acquisition by the second flow detection device 404, and the test conductivity data is obtained by real-time acquisition by the first conductivity detection device 102 and the second conductivity detection device 403, so as to generate an initial performance test result.

[0075] In this embodiment, the test pressure refers to the pressure detected by the pressure detection device 303 on the test solution in the fifth pipeline 302 during the impact resistance performance test of the industrial membrane element. The preset pressure refers to a preset pressure value. When the test pressure reaches the pressure value, it indicates that the impact force on the reverse osmosis element during the impact reaches the expected test requirement in the test environment.

[0076] In an optional embodiment of the present application, the preset pressure is in the range of 0.5-4.1 MPa. For example, the preset pressure can be 0.5 MPa, 2 MPa or 4.1 MPa. According to the inventor's practice, in order to achieve better test results, the preset pressure is generally set in the range of 0.69-1.55 MPa.

[0077] In this embodiment, the preset test length can be a preset time period for a complete impact resistance test. In an optional embodiment of the present application, the preset test length can be 0.1-5 hours, for example, 0.1 hour, 3 hours or 5 hours. According to the inventor's practice, in order to achieve better test results, the preset test length is generally set in the range of 0.5-1 hour.

[0078] In an optional embodiment of the present application, the step S204 of acquiring the second test flow data from the second flow detection device and the test conductivity data from the first conductivity detection device and the second conductivity detection device in real time to generate the initial performance test result includes:

[0079] The step A of acquiring the second test flow data from the second flow detection device in real time and determining the initial water production flow according to the second flow test data.

[0080] The step B of acquiring the test conductivity data from the first conductivity detection device and the second conductivity detection device in real time and determining the initial desalination rate according to the conductivity data.

[0081] The step C of generating the initial performance test result indicating that the initial performance is qualified when it is detected that the initial water production flow is within the preset standard initial water production flow range and the initial desalination rate is greater than the preset initial desalination rate threshold.

[0082] In the embodiment, the process of determining the initial water production flow according to the second flow test data refers to the process of reading the water production flow value corresponding to the initial time after the high-pressure pump 32 is started from all the second flow test data acquired in real time. In the embodiment, the process of determining the initial desalination rate according to the conductivity data can be the calculation result obtained by using a component desalination performance calculation formula. For example, the calculation formula can be [1-(the conductivity value at the initial time collected by the second conductivity detection device 403) / (the conductivity value at the initial time collected by the first conductivity detection device 102)]x100%. The preset initial desalination rate threshold can be a parameter of an industrial membrane element preset in advance, for example, the preset initial desalination rate threshold can be 99.5%. The preset standard initial water production flow range can be a flow parameter of a qualified industrial membrane element preset in advance, for example, the preset standard initial water production flow range can be 8900-13500(gallons per day: GPD).

[0083] The step C is to generate the initial performance test result indicating that the initial performance is qualified. In an optional embodiment of the present application, the step D of generating the initial performance test result indicating that the initial performance is qualified when it is detected that the initial water production flow is not within the preset standard initial water production flow range or the initial desalination rate is less than the preset initial desalination rate threshold.

[0084] In the embodiment, the initial water production rate can be determined according to the second test flow data collected by the second flow detection device 404, and the initial desalination rate can be determined according to the test conductivity data within the time period of a complete impact test. When the initial water production rate is detected to be within the preset standard initial water production rate range and the desalination rate is greater than the preset initial desalination rate threshold, an initial performance test result of the initial performance of the industrial membrane element is obtained, and the subsequent step can be continued. Otherwise, an initial performance test result of the initial performance of the industrial membrane element is generated, and the corresponding industrial membrane element in the membrane shell 41 needs to be replaced and the test is restarted in step S201.

[0085] S205: controlling the opening degree change of the concentrated water adjusting valve based on the first test flow data to adjust the ratio of the concentrated water outflow and the concentrated water backflow within the preset concentrated water flow ratio range.

[0086] In the embodiment, the first test flow data includes the water inflow collected by the first flow detection device 203 and the backflow concentrated water flow collected by the third flow detection device 406. The control system 6 can obtain the target opening degree of the concentrated water adjusting valve 405 according to the real-time ratio between the water inflow and the backflow concentrated water flow and the preset backflow water inflow ratio, and then control the opening degree adjustment of the concentrated water adjusting valve 405 to the target opening degree, so that the ratio between the concentrated water outflow and the concentrated water backflow is within the preset concentrated water flow ratio range, i.e. between 0.1 and 10. For example, the ratio between the concentrated water outflow and the concentrated water backflow can be 0.1, 2, 3, 5 or 10. It is known from the practice of the inventors that, in order to achieve better test results, in an optional embodiment of the present application, the preset concentrated water flow ratio range can be 0.5 to 3.

[0087] In an optional embodiment of the present application, the ratio of the backflow concentrated water flow to the water inflow is 1:1 to 1:5.

[0088] S206: adjusting the timing start-stop device 33 to set the start-stop time interval of the water inflow pump 31 and the high-pressure pump 32 to a preset start-stop interval threshold, and starting the timing start-stop device 33 to control the start-stop of the water inflow pump 31 and the high-pressure pump 32 according to the preset start-stop interval threshold to complete a start-stop cycle.

[0089] In the embodiment, the preset start-stop interval threshold can be the interval length between the start and stop of the water inflow pump 31 or the high-pressure pump 32, and the interval length between the previous stop and the re-start of the water inflow pump 31 or the high-pressure pump 32. A start-stop cycle means that the test solution has performed an impact test on the industrial membrane element.

[0090] In an optional embodiment of the present application, the preset start-stop interval threshold includes a first preset start-stop interval threshold from start to stop and a second preset start-stop interval threshold from the last stop to the re-start.

[0091] Accordingly, the step S206 of starting the timing start-stop device to control the start and stop of the water inlet pump and the high-pressure pump according to the preset start-stop interval threshold value includes:

[0092] S206a: The timing start-stop device 33 is started to control the water inlet pump 31 and the high-pressure pump 32 from starting to stopping according to the first preset start-stop interval threshold value.

[0093] S206b: The timing start-stop device is started to control the water inlet pump and the high-pressure pump from the last time of stopping to starting again according to the second preset start-stop interval threshold value.

[0094] In an optional embodiment of the present application, the first preset start-stop interval threshold value is in the range of 5 minutes to 10 hours, and the second preset start-stop interval threshold value is in the range of 10 seconds to 1 hour.

[0095] In the present embodiment, the first preset start-stop interval threshold value can be 5 minutes, 3 hours, or 10 hours. The second preset start-stop interval threshold value can be 10 seconds, 5 minutes, or 1 hour.

[0096] According to the inventor's practice, in order to improve the test efficiency while ensuring the quality of the performance test results, the first preset start-stop interval threshold value can be in the range of 15 minutes to 2 hours, and the second preset start-stop interval threshold value can be in the range of 15 seconds to 10 minutes.

[0097] For example, the time interval from the last time of stopping to starting again of the high-pressure pump 32 is 7 minutes, and the time interval from starting to stopping again of the high-pressure pump 32 is 30 minutes.

[0098] S207: When it is detected that the number of start-stop cycles reaches the preset cycle number, the timing start-stop device is controlled to be closed.

[0099] In the present embodiment, the preset cycle number refers to the preset number of start-stop cycles required from generating the initial performance test results to obtaining the terminal performance test results. In an optional embodiment of the present application, the preset start-stop number can be in the range of 200 to 20000, for example, the preset start-stop number can be 200, 1000, 10000, or 20000.

[0100] According to the inventor's practice, in order to improve the test efficiency while ensuring the quality of the performance test results, in an optional embodiment of the present application, the preset start-stop number is set in the range of 500 to 5000.

[0101] S208: According to the test conductivity data and the second test flow data, the terminal performance test results of the industrial membrane element installed in the membrane shell 41 are determined.

[0102] In the embodiment, the test conductivity data and the second test flow data are obtained in the manner of step S204 after the process of repeatedly steps S201 to S204 and the timing start-stop device 33 is closed. The end-point performance test is performed after the timing start-stop device 33 is closed. Because, the tested solution continuously circulates and frequently impacts on the installed industrial membrane element in the module 41, the water production flow of the undamaged industrial membrane element will decrease, and the desalination rate will increase or decrease.

[0103] Specifically, in an optional embodiment of the application, the test conductivity data includes the water inlet conductivity data collected by the first conductivity detection device 102 in real time and the water production conductivity data collected by the second conductivity detection device 403 in real time, and the second test flow data includes the initial water production flow data collected by the second flow detection device 404 in real time and the end-point water production flow data.

[0104] Correspondingly, the step S208 includes:

[0105] S208a: determining the desalination rate value according to the water inlet conductivity data and the water production conductivity data.

[0106] S208b: generating the end-point performance test result of the industrial membrane element when it is detected that the desalination rate value reaches below the preset desalination rate threshold and / or the end-point water production flow data is greater than the initial water production flow data.

[0107] In the embodiment, the preset desalination rate threshold can be the end-point desalination rate value corresponding to the undamaged industrial membrane element which is preset. For example, the preset desalination rate value can be 99%. The end-point water production flow data greater than the initial water production flow data indicates that the flux of the industrial membrane element greatly increases. At this time, the tested industrial membrane element needs to be further analyzed to improve the impact resistance performance and improve the product for re-production.

[0108] In an optional embodiment of the application, the calculation formula of step S206a of determining the desalination rate value according to the water inlet conductivity data and the water production conductivity data is:

[0109]

[0110] In the formula, SRR is the desalination rate value, Out is the value in the water production conductivity data, and In is the value in the water inlet conductivity data.

[0111] Based on the above embodiment, in an optional embodiment of the application, the step S206 further includes: generating the end-point performance test result of the industrial membrane element when it is detected that the desalination rate value reaches below the preset desalination rate threshold and / or the end-point water production flow data is less than the initial water production flow data.

[0112] In an optional embodiment of the present application, the decline of the reverse osmosis membrane flux is determined according to the initial water production flow data and the end water production flow data, and the decline of the reverse osmosis membrane flux is displayed to enable the user to improve the product according to the decline of the reverse osmosis membrane flux.

[0113] In the present embodiment, the display processing can be visual processing of the decline of the reverse osmosis membrane flux, which can include but is not limited to display in the form of a data table, a chart, text, voice, and a numerical value on a display for the user to view.

[0114] In the present embodiment, unlike step S206b, in the present embodiment, the end water production flow data is less than the initial water production flow data, indicating that the decline of the flux of the industrial membrane element is significantly reduced. At this time, the end performance test result of the industrial membrane element can also be generated. In addition, the decline of the flux of the industrial membrane element represents that the industrial membrane element has a tendency to have a flux decline during use after leaving the factory, although it does not represent damage and failure, but is an effective reference for the development and production of the assembly in which the industrial membrane element is installed, and targeted improvement of the test result of such industrial membrane element is beneficial to improve the performance and quality of the assembly.

[0115] The following will be described in combination with specific examples and Figure 1 The above method embodiment is described.

[0116] Example 1: First, configure a 2000 ppm sodium chloride test solution, install the industrial membrane element into four parallel membrane shells 41, open the water inlet pump 31 to exhaust the air on the fluid flow path in the device, and make the test solution flow and circulate in the fluid direction for 1 minute. Then open the valve 53 in the bypass pipe system 5, start the booster pump 52, and keep it running during the test solution circulation period. Then, start the temperature adjusting system 2, and adjust the temperature of the test solution to 10℃ during the test solution circulation period. Then, start the high-pressure pump 32, adjust the test pressure to 0.5 MPa, and set the test time to 0.1 h. Control the concentrated water adjusting valve 405 to adjust the proportion of concentrated water outlet and concentrated water reflux, and control the proportion of concentrated water outlet and concentrated water reflux to be 0.1. Set the timing start-stop device 33 to set the start-stop time interval of the water inlet pump 31 and the high-pressure pump 32, and then start the timing start-stop device 33. The time interval from the last stop to the next start of the high-pressure pump 32 is 10 seconds, and the time interval from the start to the next stop is 5 minutes. Set the preset cycle number to be one start-stop cycle from the start to the stop, and set the preset cycle number to be 20000 times. After 20000 cycles, turn off the timing start-stop device 33, perform the end performance test, and generate the end performance test result of the reverse osmosis membrane.

[0117] Example two: the same overall operation process and steps as example one, this example is not described here, example two and example one are different in that: the cycle length is set to 60 minutes, the preset temperature is set to adjust the temperature of the test solution to the preset temperature of 30℃. The preset pressure is set to 4.1Mpa, and the test time is set to 5 hours. The concentrated water outlet and concentrated water reflux ratio is set to 10. The time interval from the last stop to the restart of the high-pressure pump 32 is 1 hour, and the time interval from the start to the stop is 10 hours. The preset cycle number is set to 200 times.

[0118] Example three: example three is an extreme test scenario example of example one, which is different from example one in that the start-stop cycling device 33 is not set to work in example three, so that the pressure value collected by the pressure detection device 303 in the whole device is kept at the test pressure of 0.5Mpa, and the test is continuously run for 1660 hours, and then the end performance test is performed.

[0119] Example four: example four is an extreme test scenario example of example one, which is different from example two in that the start-stop cycling device 33 is not set to work, so that the pressure value collected by the pressure detection device 303 in the whole device is kept at the test pressure of 4.1Mpa.

[0120] Based on the test scenarios shown in examples one to four, the inventors have obtained the test data shown in Table 1.

[0121]

[0122] Table 1

[0123] According to the test results in Table 1, the device method for testing the impact resistance of industrial membrane elements provided by the embodiments of the application can quickly and accurately find the possible weak points of industrial membrane elements and the product life under impact conditions, and the super tube system 5 can efficiently test more parallel membrane shells, thereby improving the test efficiency.

[0124] Those skilled in the art can understand that all or part of the steps of the above-mentioned method embodiments can be completed by program instruction related hardware. The foregoing program can be stored in a computer readable storage medium. The program executes the steps of the above-mentioned method embodiments when executed; and the foregoing storage medium includes ROM, RAM, magnetic disc or optical disc and various storage medium that can store program codes.

[0125] The technical solutions of the present application are described above by way of illustration but not as a limitation; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An apparatus for testing the impact resistance of industrial membrane elements, characterized in that, include: Feed system, temperature control system, shock testing system, reverse osmosis membrane system, bypass tube system, and control system; The temperature control system includes a cold water supply device and a heat exchange device; the impact test system includes an inlet pump, a high-pressure pump and a timed start-stop device; the reverse osmosis membrane system includes multiple membrane housings, each housing an industrial membrane element; and the bypass tube system includes a bypass tube, a booster pump and multiple valves. The feed liquid system is connected to the inlet pump via a first pipe. The inlet pump is connected to the heat exchanger via a second pipe. The heat exchanger is connected to the cold water supply device via a third pipe. The heat exchanger is connected to the high-pressure pump via a fourth pipe. The high-pressure pump is connected to multiple membrane housings via a fifth pipe. The high-pressure pump is connected to the booster pump via a bypass pipe. Each of the multiple membrane housings is connected to the feed liquid system via a sixth pipe. Each membrane housing is also connected to the feed liquid system via a seventh pipe. The seventh pipe is connected to the booster pump via the bypass pipe. A first conductivity detection device is installed on the first pipe. A first flow detection device is installed on the fourth pipe. A pressure detection device is installed on the fifth pipe. A second conductivity detection device and a second flow detection device are installed in the passage between the sixth pipe and each membrane housing. A concentrate regulating valve is installed on the seventh pipe. Multiple valves are installed on the bypass pipe at positions on both sides of the booster pump. A third flow detection device is installed in the passage between the bypass pipe and each membrane housing. The control system is electrically connected to the temperature regulation system, the impact testing system, the reverse osmosis membrane system, the overpass tube system, the pressure detection device, the first flow detection device, the second flow detection device, the third flow detection device, the first conductivity detection device, and the second conductivity detection device. The timed start-stop device is a time control switch, which is used to start and stop the water inlet pump and the high pressure pump according to the pre-stored start-stop time data. Adjust the timer start / stop device to set the start / stop time interval between the water inlet pump and the high-pressure pump as a preset start / stop interval threshold, and start the timer start / stop device to control the start / stop of the water inlet pump and the high-pressure pump according to the preset start / stop interval threshold to complete one start / stop cycle; When the number of start-stop cycles is detected to reach the preset number of cycles, the timed start-stop device is controlled to shut down.

2. The device according to claim 1, characterized in that, The control system includes a controller and a start / stop device; the controller is electrically connected to the start / stop device, the inlet pump, the cold water supply device, the heat exchange device, the high-pressure pump, the timed start / stop device, the booster pump, multiple valves, the pressure detection device, the first flow detection device, the second flow detection device, the third flow detection device, the first conductivity detection device, and the second conductivity detection device; the start / stop device is used to set the number of start / stop cycles for the feed liquid system, the temperature control system, the impact testing system, the reverse osmosis membrane system, and the bypass pipe system.

3. A method for testing the impact resistance of industrial membrane elements, using the equipment for testing the impact resistance of industrial membrane elements as described in claim 1, characterized in that, The method is applied to the control system of the device, and the method includes: The inlet pump is turned on to ensure that the test solution in the device circulates for a preset cycle time. Within a preset cycle time, control the start-up and operation of multiple valves and booster pumps on the overpass pipe; The temperature control system adjusts the temperature of the test solution to a preset temperature within a preset cycle time. The high-pressure pump is turned on to adjust the test pressure to a preset pressure and maintain it for a preset test duration. The test pressure is collected in real time by the pressure detection device. The first test flow data is obtained in real time from the first flow detection device and the third flow detection device, the second test flow data is obtained in real time from the second flow detection device, and the test conductivity data is obtained in real time from the first conductivity detection device and the second conductivity detection device to generate the initial performance test results. Based on the first test flow data, the opening of the concentrate regulating valve is controlled to adjust the ratio of concentrate outlet and concentrate return within a preset concentrate flow ratio range. Adjust the timer start / stop device to set the start / stop time interval between the water inlet pump and the high-pressure pump as a preset start / stop interval threshold, and start the timer start / stop device to control the start / stop of the water inlet pump and the high-pressure pump according to the preset start / stop interval threshold to complete one start / stop cycle; When the number of start-stop cycles is detected to have reached the preset number of cycles, the timed start-stop device is controlled to shut down. Based on the test conductivity data and the second test flow rate data, the endpoint performance test results of the industrial membrane element installed inside the membrane housing are determined.

4. The method according to claim 3, characterized in that, The step of acquiring first test flow data in real time from the first flow detection device and the third flow detection device, acquiring second test flow data in real time from the second flow detection device, and acquiring test conductivity data in real time from the first conductivity detection device and the second conductivity detection device to generate initial performance test results includes: The second test flow rate data is acquired in real time from the second flow rate detection device, and the initial production water flow rate is determined based on the second flow rate test data. Test conductivity data is acquired in real time from the first conductivity detection device and the second conductivity detection device, and the initial desalination rate is determined based on the conductivity data. When the initial permeate flow rate is detected to be within the preset standard initial permeate flow rate range and the initial desalination rate is greater than the preset initial desalination rate threshold, an initial performance test result indicating that the initial performance is qualified is generated.

5. The method according to claim 3, characterized in that, The test conductivity data includes influent conductivity data collected in real time by the first conductivity detection device and product water conductivity data collected in real time by the second conductivity detection device. The second test flow rate data includes initial product water flow rate data and final product water flow rate data collected in real time by the second flow rate detection device. Accordingly, determining the endpoint performance test results of the industrial membrane element installed inside the membrane housing based on the tested conductivity and the tested flow rate data includes: The desalination rate is determined based on the conductivity data of the influent and the conductivity data of the product water. When the desalination rate is detected to be lower than the preset desalination rate threshold and / or the final permeate flow rate is greater than the initial permeate flow rate, the final performance test result of the industrial membrane element is generated.

6. The method according to claim 5, characterized in that, The formula for determining the desalination rate based on the influent conductivity data and the product water conductivity data is as follows: In the formula, SRR is the desalination rate, Out is the product water conductivity data, and In is the influent conductivity data.

7. The method according to any one of claims 3 to 6, characterized in that, The preset start-stop interval threshold includes a first preset start-stop interval threshold from start to stop and a second preset start-stop interval threshold from the last stop to the next start. Accordingly, the start-stop timing device controls the start and stop of the inlet pump and the high-pressure pump according to a preset start-stop interval threshold, including: The timed start-stop device is activated to control the water inlet pump and the high-pressure pump from start to stop according to the first preset start-stop interval threshold. The timed start-stop device is activated to control the water inlet pump and the high-pressure pump from the last stop to the next start according to the second preset start-stop interval threshold.

8. The method according to claim 7, characterized in that, The preset cycle duration ranges from 1 to 60 minutes, the preset temperature ranges from 10 to 30°C, the preset pressure ranges from 0.5 to 4.1 MPa, the first preset start-stop time interval ranges from 0.1 to 1 hour, the preset number of cycles ranges from 200 to 20,000, the first preset start-stop interval threshold ranges from 5 minutes to 10 hours, and the second preset start-stop interval threshold ranges from 10 seconds to 1 hour.

9. The method according to claim 5, characterized in that, Also includes: Based on the initial and final permeate flow rates, the rate of decrease in reverse osmosis membrane flux is determined and displayed so that users can make product improvements based on the rate of decrease.

Images