A filter membrane performance detection device and method for water treatment in power plants

Abstract

The present application provides a device and method for detecting the performance of filter membranes used in water treatment in power plants, wherein the device includes: a pipeline, a booster module, a desalted water module, a first counting module, a filtration module, a second counting module, and a control module, which are sequentially arranged in the pipeline from the liquid inlet to the liquid outlet. The booster module includes a variable frequency booster pump and a metering pump. The desalted water module desalinates the test liquid. The filtration module includes a filter membrane fixture and a detection component. The filter membrane fixture installs the filter membrane to be tested so that the filter membrane to be tested filters the test liquid. The detection component detects the inlet and outlet flow and pressure of the filter membrane fixture. The first counting module and the second counting module respectively detect particulate matter in the test liquid before and after filtration. The control module automatically controls the booster module, the desalted water module, the filtration module, the first counting module and the second counting module, and records data. The device can conveniently, quickly and accurately evaluate performance indicators such as flux, bubble point and interception rate of the filter membrane.

Description

Technical Field

[0001] The present application relates to the field of water treatment technology, and in particular to a device and method for detecting the performance of filter membranes used in water treatment in power plants. Background Art

[0002] Filter membranes are core components of filter elements in power plant water treatment systems, widely used in condensate pretreatment, demineralized water pretreatment, and boiler feed water treatment. Their performance directly impacts filtration effectiveness and system efficiency. Currently, membrane performance testing relies heavily on laboratory-scale testing equipment, which presents challenges such as complex operation, long testing cycles, and low data accuracy. Summary of the Invention

[0003] The embodiments of the present application at least provide a device and method for detecting the performance of filter membranes for water treatment in power plants, which can conveniently, quickly and accurately evaluate performance indicators such as flux, bubble point and interception rate of the filter membrane.

[0004] In a first aspect, an embodiment of the present application provides a filter membrane performance detection device for water treatment in a power plant, comprising: a pipeline, a booster module, a desalted water module, a first counting module, a filtration module, a second counting module, and a control module, which are sequentially arranged in the pipeline from a liquid inlet to a liquid outlet;

[0005] The pipeline is provided with a first bypass connected across the two ends of the desalted water module, a second bypass connected across the two ends of the first counting module, and a third bypass connected across the two ends of the second counting module. A liquid storage bottle is connected between the liquid inlet and the liquid outlet of the pipeline;

[0006] The boosting module includes a variable frequency boosting pump and a metering pump, wherein the variable frequency boosting pump is used to boost the pressure of the experimental liquid entering the pipeline, and the metering pump is used to control the flow rate of the experimental liquid;

[0007] The desalted water module is used to desalinate the experimental liquid;

[0008] The filtration module includes a filter membrane fixture and a detection component, the filter membrane fixture is installed with the filter membrane to be tested so that the filter membrane to be tested filters the experimental liquid, and the detection component is used to detect the inlet and outlet flow and pressure of the filter membrane fixture;

[0009] The first counting module and the second counting module are respectively used to detect particles in the experimental liquid before and after filtration;

[0010] The control module is used for automatically controlling the boosting module, the desalted water module, the filtration module, the first counting module, the second counting module and data recording.

[0011] In an optional embodiment, the variable frequency booster pump and the metering pump are both configured to be capable of bidirectional operation to achieve forward filtering and reverse backwashing functions.

[0012] In an optional embodiment, the pipeline is provided with a first sample inspection port and a second sample inspection port, the first sample inspection port is located at the inlet of the filtration module, and the second sample inspection port is located at the outlet of the filtration module.

[0013] In an optional embodiment, the control module integrates flux calculation, bubble point calculation and interception rate calculation functions.

[0014] In a second aspect, an embodiment of the present application further provides a method for detecting flux of a filter membrane for water treatment in a power plant, which is applicable to the aforementioned filter membrane performance detection device for water treatment in a power plant, and the method comprises the following steps:

[0015] Step 1: Install the filter membrane to be tested in the filtration module;

[0016] Step 2: Open the liquid inlet and outlet, input water into the liquid inlet, and after pressurization and desalination, the water enters the filter module through the second bypass, and then flows out of the liquid outlet through the third bypass. When the pipeline is full, close the liquid inlet and outlet to allow the water to continue to circulate in the pipeline;

[0017] Step 3: Control the boost module to adjust the flow rate at the inlet end of the filter membrane fixture, and obtain a flow-pressure differential characteristic curve based on the inlet and outlet flow rates and pressure of the filter membrane fixture;

[0018] Step 4: Determine the flow rate of the filter membrane to be tested under the specified pressure difference according to the flow-pressure differential characteristic curve, and calculate the flux of the filter membrane to be tested under the specified pressure difference based on this.

[0019] In an optional embodiment, the method further comprises the following steps:

[0020] Step 5: Control the boost module to run in reverse to backwash the filter membrane to be tested;

[0021] Step 6: After the backwash is completed, repeat steps 2 to 4 and obtain the flux of the filter membrane under the specified pressure difference again;

[0022] Step 7: Calculate the flux recovery rate based on the two fluxes to determine the backwash effect.

[0023] In an optional embodiment, an acid or alkaline solution is added to the water during the backwash process to enhance the cleaning effect.

[0024] In a third aspect, an embodiment of the present application further provides a method for detecting the bubble point of a filter membrane for water treatment in a power plant, which is applicable to the aforementioned filter membrane performance detection device for water treatment in a power plant, and the method comprises the following steps:

[0025] Step 1: Install the filter membrane to be tested in the filtration module;

[0026] Step 2: Open the liquid inlet, close the liquid outlet, and input isopropyl alcohol into the liquid inlet. After being pressurized, the isopropyl alcohol enters the filtration module through the first bypass and the second bypass in sequence, and then flows into the liquid storage bottle through the third bypass. When the pipeline is full, close the booster module;

[0027] Step 3: Input compressed air into the liquid inlet and slowly increase the pressure of the compressed air. When the first string of continuous bubbles emerges from the filter membrane to be tested, record the system pressure value corresponding to the bubble emergence. This system pressure value is the bubble point.

[0028] In a fourth aspect, embodiments of the present application further provide a method for detecting the interception rate of a filter membrane for water treatment in a power plant for pollutants of different particle sizes, which is applicable to the aforementioned filter membrane performance detection device for water treatment in a power plant, and the method comprises the following steps:

[0029] Step 1: Install the filter membrane to be tested in the filtration module;

[0030] Step 2: Prepare a standard particle solution according to the nominal accuracy of the filter membrane to be tested;

[0031] Step 3: Open the liquid inlet and the liquid outlet, input the standard particulate matter solution into the liquid inlet, and the standard particulate matter solution passes through the first counting module, the filtering module, and the second counting module in sequence after being pressurized, and flows out from the liquid outlet;

[0032] Step 4: Control the boost module to adjust the flow rate at the inlet end of the filter membrane fixture. After the flow rate stabilizes, record the number of particles of different particle sizes in the first counting module and the second counting module.

[0033] Step 5: Calculate the filtration efficiency of the filter membrane to be tested for particles of different sizes based on the recorded number of particles of different sizes.

[0034] In an optional embodiment, the method further comprises the following steps:

[0035] Step 6: inspect samples through the first inspection port and the second inspection port respectively;

[0036] Step 7: Calculate the interception rate of the filter membrane to be tested for the target substance based on the test sample results.

[0037] The above technical solution of this application has the following beneficial technical effects:

[0038] The power plant water treatment membrane performance testing device described in this application integrates a pressurization module, a desalination module, a filtration module, and a counting module, combined with automated control, to achieve efficient and accurate testing of membrane flux, bubble point, and interception rate. This device is easy to operate and suitable for rapid on-site testing, overcoming the limitations of traditional laboratory testing.

[0039] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. The drawings herein are incorporated into and constitute a part of the specification. These drawings illustrate embodiments consistent with the present application and, together with the specification, are used to illustrate the technical solutions of the present application. It should be understood that the following drawings only illustrate certain embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without inventive effort.

[0041] Figure 1 A schematic diagram of a filter membrane performance detection device for water treatment in a power plant provided in an embodiment of the present application is shown;

[0042] In the figure: 10, pipeline; 11, first bypass; 12, second bypass; 13, third bypass; 14, liquid storage bottle; 15, first sample inspection port; 16, second sample inspection port; 20, booster module; 21, variable frequency booster pump; 22, metering pump; 30, desalted water module; 31, coarse filter pleated filter element; 32, reverse osmosis membrane; 33, ultraviolet lamp; 40, first counting module; 50, filtration module; 51, filter membrane fixture; 52, first pressure transmitter; 53, second pressure transmitter; 54, first electromagnetic flowmeter; 55, second electromagnetic flowmeter; 60, second counting module; 70, control module; 80, casing. DETAILED DESCRIPTION

[0043] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0044] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0045] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0046] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0047] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0048] The embodiments of the present application provide a device and method for detecting the performance of filter membranes for water treatment in power plants. The device can conveniently, quickly and accurately evaluate performance indicators such as flux, bubble point and interception rate of the filter membrane.

[0049] Specifically, the filter membrane performance detection device for power plant water treatment includes: a pipeline 10, a booster module 20, a desalted water module 30, a first counting module 40, a filtration module 50, a second counting module 60, and a control module 70, which are sequentially arranged in series in the direction from the liquid inlet to the liquid outlet. The pipeline 10 is provided with a first bypass 11 spanning the two ends of the desalted water module 30, a second bypass 12 spanning the two ends of the first counting module 40, and a third bypass 13 spanning the two ends of the second counting module 60. A liquid storage bottle 14 is connected between the liquid inlet and the liquid outlet of the pipeline 10. The booster module 20 includes a variable frequency booster pump 21 and a metering pump 22. The variable frequency booster pump 21 is used to boost the test liquid entering the pipeline 10, and the metering pump 22 is used to control the flow rate of the test liquid. The desalted water module 30 is used to desalinate the test liquid. The filtration module 50 includes a filter membrane fixture 51 and a detection component. The filter membrane fixture 51 is used to install the filter membrane to be tested so that the filter membrane to be tested can filter the experimental liquid. The detection component is used to detect the inlet and outlet flow and pressure of the filter membrane fixture 51. The first counting module 40 and the second counting module 60 are respectively used to detect particulate matter in the experimental liquid before and after filtration. The control module 70 is used to automatically control the boosting module 20, the desalted water module 30, the filtration module 50, the first counting module 40, the second counting module 60, and data recording.

[0050] The power plant water treatment membrane performance testing device of the present application integrates a pressurization module 20, a desalted water module 30, a filtration module 50, and a counting module, and combines automated control to achieve efficient and accurate testing of membrane flux, bubble point, and interception rate. The device is easy to operate and suitable for rapid on-site testing, overcoming the limitations of traditional laboratory testing.

[0051] Optionally, in some embodiments, a first valve is provided at the inlet end of the liquid storage bottle 14, and a second valve is provided at the outlet end of the liquid storage bottle 14. When the experimental liquid normally enters and exits through the liquid inlet and liquid outlet, the first valve and the second valve are in a closed state. When the experimental liquid needs to circulate in the circulation path formed by the liquid storage bottle 14 and the pipeline 10, the liquid inlet and liquid outlet, as well as the first valve and the second valve, can be opened.

[0052] Optionally, in some embodiments, the pipeline 10 is provided with a first sampling port 15 and a second sampling port 16, wherein the first sampling port 15 is located at the inlet of the filtration module 50, and the second sampling port 16 is located at the outlet of the filtration module 50. Specifically, during use, the first sampling port 15 and the second sampling port 16 are used to sample the experimental liquid before and after filtration, respectively, and the interception rate of the test filter membrane for the target substance can be determined based on the concentration of the target substance in the two samples.

[0053] Optionally, in some embodiments, the variable frequency booster pump 21 and the metering pump 22 are configured to operate in both directions to achieve forward filtration and reverse backwashing functions. Specifically, the variable frequency booster pump 21 and the metering pump 22 are capable of both forward and reverse operation. During forward operation, the test liquid enters from the liquid inlet and can pass through the filtration module 50 to filter the test liquid. During reverse operation, the test liquid enters from the liquid outlet and can pass through the filtration module 50 to reverse wash the filter membrane to be tested.

[0054] Optionally, in some embodiments, the desalinated water module 30 implements multi-stage desalination and sterilization through a coarse filtration pleated filter element 31, a reverse osmosis membrane 32, and an ultraviolet lamp 33. Specifically, when the experimental liquid passes through the desalinated water module 30, it is sequentially filtered, desalinated, and sterilized by the coarse filtration pleated filter element 31, the reverse osmosis membrane 32, and the ultraviolet lamp 33.

[0055] Optionally, in some embodiments, the filter membrane fixture 51 of the filtration module 50 is configured to be able to unfold the filter membrane to be tested through mechanical tension, and the mechanical tension of the filter membrane fixture 51 is adjustable. This configuration allows the filter membrane fixture 51 to be suitable for unfolding filter membranes of different specifications and models, helping to improve applicability. For example, the mechanical tension required for unfolding a PP membrane is 5 MPa, the mechanical tension required for unfolding a PES membrane is 10 MPa, and the mechanical tension required for unfolding a PVDF membrane is 15 MPa. Of course, a filter membrane fixture 51 capable of changing the mechanical tension is conventional technology and will not be described in detail in this embodiment.

[0056] Optionally, in some embodiments, the detection component of the filter module 50 includes a first pressure transmitter 52, a second pressure transmitter 53, a first electromagnetic flowmeter 54, and a second electromagnetic flowmeter 55. The first pressure transmitter 52 is located at the inlet end of the filter membrane fixture 51, and the first pressure transmitter 52 is used to detect the inlet pressure of the filter membrane fixture 51. The second pressure transmitter 53 is located at the outlet end of the filter membrane fixture 51, and the second pressure transmitter 53 is used to detect the outlet pressure of the filter membrane fixture 51. The first electromagnetic flowmeter 54 is located at the inlet end of the filter membrane fixture 51, and the first electromagnetic flowmeter 54 is used to detect the inlet flow of the filter membrane fixture 51. The second electromagnetic flowmeter 55 is located at the outlet end of the filter membrane fixture 51, and the second electromagnetic flowmeter 55 is used to detect the outlet flow of the filter membrane fixture 51.

[0057] Optionally, in some embodiments, the control module 70 integrates flux calculation, bubble point calculation, and interception rate calculation functions. In other words, the control module 70 can automatically calculate the flux, bubble point, and interception rate of the filter membrane to be tested based on the detection results.

[0058] Optionally, in some embodiments, the device further comprises a housing 80, in which the pipeline 10, the boosting module 20, the desalted water module 30, the first counting module 40, the filtration module 50, the second counting module 60, and the control module 70 are all integrated. This arrangement facilitates the storage and portability of the filter membrane performance testing device for power plant water treatment. Of course, for ease of use, in a specific configuration, the liquid inlet, liquid outlet, first sample inspection port 15, and second sample inspection port 16 of the pipeline 10 may extend to the exterior or outer surface of the housing 80.

[0059] Example 1

[0060] A method for detecting flux of a filter membrane for water treatment in a power plant, applicable to the aforementioned filter membrane performance detection device for water treatment in a power plant, comprises the following steps:

[0061] Step 1: Install the filter membrane to be tested in the filter module 50 (the filter membrane holder 51);

[0062] Step 2: Open the liquid inlet and outlet (of pipeline 10) and input water into the liquid inlet. The water is pressurized by the boosting module 20 and desalinated by the desalted water module 30. After that, the water enters the filtration module 50 through the second bypass 12 and then flows out of the liquid outlet through the third bypass 13. When the pipeline 10 is full, close the liquid inlet and outlet to allow the (desalted) water to continue to circulate in the pipeline 10.

[0063] Step 3: Control the boost module 20 (via the control module 70) to adjust the flow rate at the inlet of the membrane holder 51 by adjusting the output of the variable frequency boost pump 21 and the opening of the electromagnetic regulating valve, and obtain a flow-pressure differential characteristic curve based on the inlet and outlet flow rates and pressure of the membrane holder 51;

[0064] Step 4: Determine the flow rate of the filter membrane under the specified pressure differential based on the flow-pressure differential characteristic curve, and use this to calculate the flux of the filter membrane under the specified pressure differential, thereby determining the volume of filtrate passing through the unit membrane area per unit time. The flux calculation formula is as follows:

[0065] J= V / A

[0066] Among them, J is membrane flux, the unit is m 3 / (m 2 .h);

[0067] V——Flow rate under specified pressure difference, in m 3 / h;

[0068] A——Effective filtration area of ​​the membrane in the filter holder, in m 2 .

[0069] Furthermore, the method may further include:

[0070] Step 5: Control the boost module to run in reverse to backwash the filter membrane to be tested;

[0071] Step 6: After the backwash is completed, repeat steps 2 to 4 and obtain the flux of the filter membrane under the specified pressure difference again;

[0072] Step 7: Calculate the flux recovery rate based on the two fluxes to determine the backwash effect. The calculation formula for the flux recovery rate is as follows:

[0073] R (%) = (J2-J1) / J1

[0074] Where, R is the flux recovery rate, in %;

[0075] J1——Filter membrane flux before backwash cleaning, unit is m 3 / (m 2 .h);

[0076] J2——Filter membrane flux after backwash cleaning, unit is m 3 / (m 2 .h).

[0077] That is to say, the filter membrane to be tested may be an old filter membrane that has been used. By testing the flux of the filter membrane to be tested before and after backwashing, the backwashing effect of the old filter membrane can be judged.

[0078] Furthermore, controlling the boost module 20 to reversely operate to backwash the filter membrane under test actually controls the variable frequency boost pump 21 and metering pump 22 to operate in reverse. When the variable frequency boost pump 21 and metering pump 22 operate in reverse, water enters from the liquid outlet and can pass through the filter module 50 to reversely clean the filter membrane under test. Of course, to enhance the backwash cleaning effect, an acid or alkaline solution can also be added to the water during the backwash process.

[0079] Example 2

[0080] A method for detecting the bubble point of a filter membrane used in power plant water treatment is applicable to the aforementioned power plant water treatment filter membrane performance detection device, and the method comprises the following steps:

[0081] Step 1: Install the filter membrane to be tested in the filter module 50 (the filter membrane holder 51);

[0082] Step 2: Open the liquid inlet (of pipeline 10), close the liquid outlet, and input isopropyl alcohol into the liquid inlet. After being pressurized, the isopropyl alcohol passes through the first bypass 11 and the second bypass 12 in sequence into the filtration module 50, and then flows into the liquid storage bottle 14 through the third bypass 13. When pipeline 10 is full, close the pressurizing module 20;

[0083] Step 3: Input compressed air into the liquid inlet and slowly increase the pressure of the compressed air. When the first string of continuous bubbles emerges from the filter membrane to be tested, record the system pressure value corresponding to the bubble emergence. This system pressure value is the bubble point.

[0084] After recording the bubble point, slowly increase the compressed air pressure to observe whether the system pressure value continues to rise. If so, wait for a group of bubbles to appear and then turn off the air source to release the pressure. It should be noted that bubbles may be adsorbed or retained on the outer surface of the filter membrane to be tested, resulting in a small number of false bubbles. These bubbles should be ignored.

[0085] In addition, when the bubble point is determined, the maximum pore size of the filter membrane can be calculated according to the Young-Laplace equation. The specific formula is as follows:

[0086] d = (4γcosθ) / ΔP

[0087] Among them, ΔP is the bubble point pressure, which is the minimum pressure required for gas to penetrate the membrane pores, in Pa;

[0088] γ is the surface tension of the liquid in mN / m, for example, isopropyl alcohol is about 21.3 mN / m at 20°C;

[0089] θ - contact angle between liquid and membrane material, reflecting wettability. When fully wetted, cosθ=1.

[0090] d - membrane pore size, i.e. the theoretical maximum pore size (the maximum pore size measured by the bubble point method), unit is mm.

[0091] Example 3

[0092] A method for detecting the interception rate of a filter membrane used for water treatment in a power plant for pollutants of different particle sizes is applicable to the aforementioned filter membrane performance detection device for water treatment in a power plant. The method comprises the following steps:

[0093] Step 1: Install the filter membrane to be tested in the filter module 50 (the filter membrane holder 51);

[0094] Step 2: Prepare a standard particle solution according to the nominal accuracy of the filter membrane to be tested;

[0095] Step 3: Open the liquid inlet and the liquid outlet, input the standard particulate matter solution into the liquid inlet, and the standard particulate matter solution passes through the first counting module 40, the filtering module 50, and the second counting module 60 in sequence after being pressurized, and flows out from the liquid outlet;

[0096] Step 4: Control the boost module 20 to adjust the flow rate at the inlet end of the filter membrane fixture 51. After the flow rate stabilizes, record the number of particles of different particle sizes in the first counting module 40 and the second counting module 60.

[0097] Step 5: Calculate the filtration efficiency of the filter membrane to be tested for particles of different sizes based on the recorded number of particles of different sizes.

[0098] For example, the standard particle solution can be a standard particle solution with a concentration of 1g / L, which contains five particles with different particle sizes, which are recorded as A1, A2, A3, A4 and A5. During the filtration process, the filtration flow rate can be controlled at 0.5m 3 / h (±20%).

[0099] When calculating filtration efficiency, 5 pairs of upstream and downstream particle size distribution comparison data can be grouped together, totaling 20 pairs of upstream and downstream particle size distribution comparison data, totaling 4 groups. The average number of particles in each particle size channel of the 4 groups is calculated to calculate the filtration efficiency of the required accuracy. The calculation formula is as follows:

[0100]

[0101] Wherein, η is the filtration efficiency of the required precision, in units of %;

[0102] ——The average number of particles larger than the required precision particle size in the four sets of data recorded by the upstream particle counter, in pieces / ml;

[0103] ——The average number of particles larger than the required precision particle size in the four sets of data recorded by the downstream particle counter, in pieces / ml.

[0104] Furthermore, the method may further include:

[0105] Step 6: inspect samples through the first inspection port 15 and the second inspection port 16 respectively;

[0106] Step 7: Calculate the interception rate of the test filter membrane for the target substance based on the test sample results. The calculation formula for the interception rate of the target substance is as follows:

[0107]

[0108] in, ——Interception rate of target substances, in %;

[0109] ——Upstream target substance concentration, in mmol / L;

[0110] ——Concentration of downstream target substance, in mmol / L;

[0111] In other words, the above method can be used to test the interception rate of a test filter for other target substances. For example, to test the interception rate of tetracycline antibiotics, samples can be taken from upstream and downstream external ports, and concentrations can be measured upstream and downstream using a UV-visible spectrophotometer to calculate the interception rate of the filter for the target substance.

[0112] The one or more embodiments of this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this specification shall be included within the scope of protection of this application.

[0113] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A filter membrane performance detection device for water treatment in a power plant, characterized in that: include: A pipeline, a booster module, a desalted water module, a first counting module, a filter module, a second counting module, and a control module are sequentially arranged in series in the direction from the liquid inlet to the liquid outlet; The pipeline is provided with a first bypass connected across the two ends of the desalted water module, a second bypass connected across the two ends of the first counting module, and a third bypass connected across the two ends of the second counting module. A liquid storage bottle is connected between the liquid inlet and the liquid outlet of the pipeline; The boosting module includes a variable frequency boosting pump and a metering pump, wherein the variable frequency boosting pump is used to boost the pressure of the experimental liquid entering the pipeline, and the metering pump is used to control the flow rate of the experimental liquid; The desalted water module is used to desalinate the experimental liquid; The filtration module includes a filter membrane fixture and a detection component, the filter membrane fixture is installed with the filter membrane to be tested so that the filter membrane to be tested filters the experimental liquid, and the detection component is used to detect the inlet and outlet flow and pressure of the filter membrane fixture; The first counting module and the second counting module are respectively used to detect particles in the experimental liquid before and after filtration; The control module is used for automatically controlling the boosting module, the desalted water module, the filtration module, the first counting module, the second counting module and data recording.

2. The filter membrane performance detection device for water treatment in power plants according to claim 1, characterized in that: The variable frequency booster pump and the metering pump are both configured to be capable of bidirectional operation to achieve forward filtering and reverse backwashing functions.

3. The filter membrane performance detection device for water treatment in power plants according to claim 1, characterized in that: The pipeline is provided with a first sample detection port and a second sample detection port, wherein the first sample detection port is located at the inlet of the filtration module, and the second sample detection port is located at the outlet of the filtration module.

4. The filter membrane performance detection device for water treatment in power plants according to claim 1, characterized in that: The control module integrates flux calculation, bubble point calculation and interception rate calculation functions.

5. A method for detecting flux of a filter membrane for water treatment in a power plant, applicable to the filter membrane performance detection device for water treatment in a power plant according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: Step 1: Install the filter membrane to be tested in the filtration module; Step 2: Open the liquid inlet and outlet, input water into the liquid inlet, and after pressurization and desalination, the water enters the filter module through the second bypass, and then flows out of the liquid outlet through the third bypass. When the pipeline is full, close the liquid inlet and outlet to allow the water to continue to circulate in the pipeline; Step 3: Control the boost module to adjust the flow rate at the inlet end of the filter membrane fixture, and obtain a flow-pressure differential characteristic curve based on the inlet and outlet flow rates and pressure of the filter membrane fixture; Step 4: Determine the flow rate of the filter membrane to be tested under the specified pressure difference according to the flow-pressure differential characteristic curve, and calculate the flux of the filter membrane to be tested under the specified pressure difference based on this.

6. The method according to claim 5, characterized in that The method further comprises the following steps: Step 5: Control the boost module to run in reverse to backwash the filter membrane to be tested; Step 6: After the backwash is completed, repeat steps 2 to 4 and obtain the flux of the filter membrane under the specified pressure difference again; Step 7: Calculate the flux recovery rate based on the two fluxes to determine the backwash effect.

7. The method according to claim 6, characterized in that During the backwash process, acid or alkaline solutions are added to the water to enhance the cleaning effect.

8. A method for detecting the bubble point of a filter membrane for water treatment in a power plant, applicable to the filter membrane performance detection device for water treatment in a power plant according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: Step 1: Install the filter membrane to be tested in the filtration module; Step 2: Open the liquid inlet, close the liquid outlet, and input isopropyl alcohol into the liquid inlet. After being pressurized, the isopropyl alcohol enters the filtration module through the first bypass and the second bypass in sequence, and then flows into the liquid storage bottle through the third bypass. When the pipeline is full, close the booster module; Step 3: Input compressed air into the liquid inlet and slowly increase the pressure of the compressed air. When the first string of continuous bubbles emerges from the filter membrane to be tested, record the system pressure value corresponding to the bubble emergence. This system pressure value is the bubble point.

9. A method for detecting the interception rate of a filter membrane for water treatment in a power plant for pollutants of different particle sizes, applicable to the performance detection device for a filter membrane for water treatment in a power plant according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: Step 1: Install the filter membrane to be tested in the filtration module; Step 2: Prepare a standard particle solution according to the nominal accuracy of the filter membrane to be tested; Step 3: Open the liquid inlet and the liquid outlet, input the standard particulate matter solution into the liquid inlet, and the standard particulate matter solution passes through the first counting module, the filtering module, and the second counting module in sequence after being pressurized, and flows out from the liquid outlet; Step 4: Control the boost module to adjust the flow rate at the inlet end of the filter membrane fixture. After the flow rate stabilizes, record the number of particles of different particle sizes in the first counting module and the second counting module. Step 5: Calculate the filtration efficiency of the filter membrane to be tested for particles of different sizes based on the recorded number of particles of different sizes.

10. The method according to claim 9, characterized in that The method further comprises the following steps: Step 6: inspect samples through the first inspection port and the second inspection port respectively; Step 7: Calculate the interception rate of the filter membrane to be tested for the target substance based on the test sample results.

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