Flat sheet membrane test apparatus

Abstract

The utility model belongs to flat plate membrane test equipment technical field, concretely relates to a kind of flat plate membrane testing device, including membrane cell, and membrane cell is connected with feeding pump by pipeline, and feeding pump inlet end is connected with liquid tank by pipeline, and the inside of membrane cell is provided with flat plate membrane to be measured, and membrane cell whole is set as hollow cylinder, and several pieces of turbulence insert are set on the inner wall of membrane cell, and several pieces of turbulence insert are set around the central axis of membrane cell, and the bottom of membrane cell is provided with aeration pipe, and several groups of gas distribution pipes are connected on aeration pipe, and several groups of gas distribution pipes are symmetrically distributed on the both sides of aeration pipe with the central axis of aeration pipe as reference, and several groups of gas distribution pipes are all vertically extended and set upwards.The device can increase the turbulence intensity of the surface of flat plate membrane, solve the problem of test data distortion caused by insufficient turbulence of traditional flat plate membrane testing device.

Description

Technical Field

[0001] This utility model belongs to the technical field of flat sheet membrane testing equipment, and specifically relates to a flat sheet membrane testing device. Background Technology

[0002] Membrane separation technology is one of the core technologies in modern water treatment, material separation, and biomedicine. Before new flat-sheet membrane materials are applied industrially, their performance must be evaluated using laboratory-scale flat-sheet membrane testing equipment to obtain key parameters such as permeate flux, rejection rate, antifouling properties, and long-term operational stability. For high-pressure processes such as reverse osmosis and nanofiltration, the testing equipment typically includes a high-pressure pump, a membrane tank, and a pressure and flow measurement system. Its working principle is as follows: the high-pressure pump provides the driving force, causing the feed liquid to flow through the membrane tank under positive pressure; the solvent permeates through the membrane to become permeate, while the solute is retained as concentrate. However, in pursuit of structural simplicity and reliable sealing, traditional laboratory flat-sheet membrane testing equipment often uses a rectangular membrane tank. High-pressure feed liquid in a rectangular membrane tank tends to exhibit laminar or weakly turbulent flow, leading to severe concentration polarization during testing and failing to effectively simulate the membrane's operation in a real industrial environment. The low shear force and low turbulence conditions inside traditional devices differ significantly from the high-intensity, highly complex turbulent field induced by the mesh in large industrial membrane elements. This discrepancy leads to severely distorted laboratory test results, resulting in a high risk of failure when scaled up to industrial applications, extending the R&D cycle and increasing innovation costs.

[0003] Chinese patent CN201930727U discloses a flat sheet membrane testing device, including upper and lower bases. The lower base has a first inner cavity, and the upper base has a second inner cavity. The first and second inner cavities are connected by a sealing element. The lower base has a first inlet and an outlet, and the upper base has a second outlet. The first inlet and outlet are connected to the first inner cavity, and the second outlet is connected to the second inner cavity. The sealing element includes a first and a second sealing ring. The upper surface of the lower base and the first inner cavity form a transition surface, and the first and second sealing rings are disposed on the transition surface, with the first sealing ring fitted inside the second sealing ring. This patent has good sealing performance, and the stainless steel base can withstand greater pressure, which not only improves the design pressure but also ensures the test results. However, the patent sets multiple protruding parallel ridges at the bottom of the lower base to form flow channels, resulting in very limited turbulence intensity. This is insufficient to effectively disrupt the fluid boundary layer on the membrane surface, and the tested membrane will prematurely and rapidly undergo concentration polarization and fouling due to insufficient surface turbulence. The test data cannot accurately predict the long-term performance of the membrane in real industrial applications. Utility Model Content

[0004] The purpose of this invention is to provide a flat sheet membrane testing device that can increase the turbulence intensity on the surface of the flat sheet membrane and solve the problem of test data distortion caused by insufficient turbulence in traditional flat sheet membrane testing devices.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: A flat sheet membrane testing device includes a membrane tank, a feed pump connected to the membrane tank via a pipeline, a feed liquid tank connected to the inlet of the feed pump via a pipeline, a flat sheet membrane to be tested placed inside the membrane tank, the membrane tank being a hollow cylinder in shape, several turbulence-inducing inserts arranged on the inner wall of the membrane tank, the several turbulence-inducing inserts being arranged around the central axis of the membrane tank, an aeration pipe arranged at the bottom of the membrane tank, several sets of gas distribution pipes connected to the aeration pipe, the several sets of gas distribution pipes being symmetrically distributed on both sides of the aeration pipe with the central axis of the aeration pipe as a reference, and all the several sets of gas distribution pipes extending vertically upward.

[0006] Furthermore, the membrane pool is equipped with two parallel membrane slots, and several flat membranes to be tested are inserted between the two membrane slots.

[0007] Furthermore, several sheet membranes to be tested are arranged parallel to each other, and all of the sheet membranes to be tested are vertically inserted into the membrane slots.

[0008] Furthermore, each sheet membrane under test has a water outlet connected to a water collection pipe, and several water collection pipes are connected to a common converging pipe.

[0009] Furthermore, one end of the collecting pipe passes through the membrane tank and extends to the outside of the membrane tank.

[0010] Furthermore, the turbulence insert is arranged in a plate-like structure and is detachably mounted on the inner wall of the membrane tank by means of fasteners.

[0011] Furthermore, the fastener is a snap-fit ​​assembly, a retainer is provided on the inner wall of the membrane tank, and the edge of the turbulence insert is provided with a hook to cooperate with the retainer. The turbulence insert is detachably mounted on the inner wall of the membrane tank through the snap-fit ​​assembly.

[0012] Furthermore, the fixing component is a magnetic adsorption assembly, the turbulence insert is provided with a magnetic adsorption component, and the inner wall of the membrane tank is provided with a magnetic component. The turbulence insert is adsorbed and set on the inner wall of the membrane tank by the magnetic adsorption assembly.

[0013] Furthermore, several sets of turbulence holes are provided through the turbulence insert.

[0014] Furthermore, a controller is installed on one side of the membrane tank, and the membrane tank, feed pump, and feed tank are all electrically connected to the controller.

[0015] The beneficial effects of this utility model are as follows: This invention creates a highly uniform three-dimensional turbulent field without dead zones by designing the membrane tank as a hollow cylinder and incorporating turbulence-inducing inserts, aeration pipes, and gas distribution pipes. This fundamentally solves the problem of uneven fluid distribution inherent in traditional rectangular flow channels. The cylindrical structure eliminates corner dead zones in rectangular membrane tanks, ensuring a uniform and symmetrical fluid path. The turbulence-inducing inserts continuously cut and disturb the fluid, while the gas distribution pipes generate a uniformly rising bubble flow. The bubble flow and the horizontal turbulence generated by the turbulence-inducing inserts superimpose, collide, and shear within the membrane tank, forming a far more intense gas-liquid two-phase turbulence than traditional designs. This ensures that the surface of the sheet membrane under test is constantly subjected to uniform and high-intensity hydraulic scouring, effectively suppressing concentration polarization and pollutant deposition. The key parameters measured by this device, such as membrane flux, rejection rate, and antifouling performance, more accurately reflect the intrinsic characteristics of sheet membrane materials, improving the accuracy and reliability of predicting the long-term operating performance of industrial-grade sheet membranes. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a partial structural cross-sectional view of the membrane tank, turbulence insert, water collection pipe, and water collection pipe in this utility model; Figure 3 This is a schematic diagram of the structure of the aeration pipe, gas distribution pipe, turbulence insert, water collection pipe and converging pipe in this utility model; Figure 4 This is a schematic diagram of the diaphragm slot and the flat sheet membrane to be tested in this utility model; Figure 5 This is a schematic diagram of the structure of the turbulence insert in this utility model; Figure 6 This is a schematic diagram of the structure of the aeration pipe and the gas distribution pipe in this utility model; In the picture: 1. Membrane tank; 2. Feed pump; 3. Feed tank; 4. Turbulence insert; 5. Aeration pipe; 6. Gas distribution pipe; 7. Membrane slot; 8. Flat sheet membrane to be tested; 9. Water collection pipe; 10. Collection pipe; 11. Controller. Detailed Implementation

[0017] The present invention will now be described and illustrated in detail with reference to the embodiments.

[0018] Example 1 like Figure 1-6As shown, the flat sheet membrane testing device includes a membrane tank 1, a feed pump 2 connected to the membrane tank 1 via a pipeline, a feed tank 3 connected to the inlet end of the feed pump 2 via a pipeline, a flat sheet membrane 8 to be tested being placed inside the membrane tank 1, the membrane tank 1 being a hollow cylinder, several baffles 4 being arranged on the inner wall of the membrane tank 1, the baffles 4 being arranged around the central axis of the membrane tank 1, an aeration pipe 5 being arranged at the bottom of the membrane tank 1, several gas distribution pipes 6 being connected to the aeration pipe 5, the gas distribution pipes 6 being symmetrically distributed on both sides of the aeration pipe 5 with the central axis of the aeration pipe 5 as the reference, and all the gas distribution pipes 6 extending vertically upward.

[0019] The membrane pool 1 has two parallel membrane slots 7 inside, and several flat membranes 8 to be tested are inserted between the two membrane slots 7.

[0020] Several flat sheet membranes 8 to be tested are arranged in parallel to each other, and all of the flat sheet membranes 8 to be tested are vertically inserted into the membrane slots 7.

[0021] Each sheet membrane 8 under test has a water outlet connected to a water collection pipe 9, and several water collection pipes 9 are connected to a common converging pipe 10.

[0022] One end of the collecting pipe 10 passes through the membrane tank 1 and extends to the outside of the membrane tank 1.

[0023] The turbulence insert 4 is generally plate-shaped and is detachably mounted on the inner wall of the membrane tank 1 by means of fasteners.

[0024] The fastener is a snap-fit ​​assembly. A retainer is provided on the inner wall of the membrane tank 1. The edge of the turbulence insert 4 is provided with a hook to cooperate with the retainer. The turbulence insert 4 is detachably mounted on the inner wall of the membrane tank 1 through the snap-fit ​​assembly.

[0025] The fixing component is a magnetic adsorption assembly. The turbulence insert 4 is equipped with a magnetic adsorption component, and the inner wall of the membrane tank 1 is equipped with a magnetic component. The turbulence insert 4 is adsorbed and set on the inner wall of the membrane tank 1 by the magnetic adsorption assembly.

[0026] Several sets of turbulence holes are provided through the turbulence insert 4.

[0027] A controller 11 is installed on one side of the membrane tank 1. The membrane tank 1, the feed pump 2 and the liquid tank 3 are all electrically connected to the controller 11.

[0028] Working principle and process: I. Preparation and Launch Phase The feed tank 3 stores the feed liquid to be processed. The device is started by the controller 11, and the feed pump 2 starts to work, drawing the feed liquid out of the feed tank 3 and transporting it to the membrane tank 1 through the pipeline.

[0029] II. Membrane Testing Stage After the feed liquid enters the hollow cylindrical membrane tank 1, it flows within the tank. As the feed liquid passes through several turbulence-inducing inserts 4 arranged around the central axis of the membrane tank 1, it is continuously cut and disturbed, forming high-intensity horizontal turbulence. Simultaneously, the aeration pipe 5 begins to supply gas, which is released through several sets of vertically upward-extending gas distribution pipes 6, forming a uniformly rising bubble flow at the bottom of the membrane tank 1. The rising bubble flow and the horizontal turbulence generated by the turbulence-inducing inserts 4 strongly superimpose, collide, and shear within the membrane tank 1, jointly creating a three-dimensional gas-liquid two-phase turbulent field with no dead zones and a high degree of uniformity.

[0030] III. Filtering Stage Driven by pressure, the solvent in the feed solution permeates through the sheet membrane 8 to be tested and becomes the permeate. The sheet membrane 8 is vertically inserted into the membrane slot 7, and its surface is subjected to uniform and high-intensity turbulence, which can effectively suppress concentration polarization and pollutant deposition.

[0031] The permeate enters the collection pipe 9 connected to the sheet membrane 8 through the product water outlet, then flows into the collection pipe 10, and is finally discharged from the outlet end of the collection pipe 10 that runs through the membrane tank 1 and collected for calculating performance parameters such as permeate flux; the unfiltered concentrate remains in the membrane tank 1 and continues to flow.

[0032] IV. Conclusion Throughout the test, controller 11 continuously monitors and controls key parameters such as the flow rate and pressure of feed pump 2 and the air volume of aeration pipe 5. After the test, the air supply to feed pump 2 and aeration pipe 5 is turned off sequentially to complete one test cycle.

Claims

1. A flat sheet membrane testing device, comprising a membrane tank (1), a feed pump (2) connected to the membrane tank (1) via a pipeline, a feed liquid tank (3) connected to the inlet end of the feed pump (2) via a pipeline, and a flat sheet membrane (8) to be tested disposed inside the membrane tank (1), characterized in that, The membrane tank (1) is set in a hollow cylindrical shape. Several baffles (4) are set on the inner wall of the membrane tank (1). Several baffles (4) are set around the central axis of the membrane tank (1). An aeration pipe (5) is set at the bottom of the membrane tank (1). Several sets of gas distribution pipes (6) are connected to the aeration pipe (5). Several sets of gas distribution pipes (6) are symmetrically distributed on both sides of the aeration pipe (5) with the central axis of the aeration pipe (5) as the reference. Several sets of gas distribution pipes (6) are all set to extend vertically upward.

2. The flat sheet membrane testing device according to claim 1, characterized in that, The membrane pool (1) has two parallel membrane slots (7) inside, and several flat membranes (8) to be tested are inserted between the two membrane slots (7).

3. The flat sheet membrane testing device according to claim 2, characterized in that, Several flat sheet membranes (8) to be tested are arranged in parallel to each other, and several flat sheet membranes (8) to be tested are inserted vertically into the membrane slot (7).

4. The flat sheet membrane testing device according to claim 2, characterized in that, Each sheet membrane (8) to be tested has a water outlet connected to a water collection pipe (9), and several water collection pipes (9) are connected to a common converging pipe (10).

5. The flat sheet membrane testing device according to claim 4, characterized in that, One end of the collecting pipe (10) passes through the membrane tank (1) and extends to the outside of the membrane tank (1).

6. The flat sheet membrane testing device according to claim 1, characterized in that, The turbulence insert (4) is set in a plate-like structure and is detachably set on the inner wall of the membrane tank (1) by means of fasteners.

7. The flat sheet membrane testing apparatus according to claim 6, characterized in that, The fastener is a snap-fit ​​assembly. A seat is provided on the inner wall of the membrane pool (1). The edge of the turbulence insert (4) is fitted with a hook to cooperate with the seat. The turbulence insert (4) is detachably mounted on the inner wall of the membrane pool (1) through the snap-fit ​​assembly.

8. The flat sheet membrane testing apparatus according to claim 6, characterized in that, The fixing component is a magnetic adsorption component. The turbulence insert (4) is provided with a magnetic adsorption component, and the inner wall of the membrane pool (1) is provided with a magnetic component. The turbulence insert (4) is adsorbed and set on the inner wall of the membrane pool (1) by the magnetic adsorption component.

9. The flat sheet membrane testing apparatus according to claim 6, characterized in that, Several sets of turbulence holes are provided through the turbulence insert (4).

10. The flat sheet membrane testing device according to claim 1, characterized in that, A controller (11) is installed on one side of the membrane tank (1). The membrane tank (1), the feed pump (2) and the liquid tank (3) are all electrically connected to the controller (11).

Images