A membrane element flow channel spacer detection device and its application

Abstract

The present invention discloses a membrane element flow channel spacer detection device and its application, which includes a workbench, a material barrel, a feed pump and a plurality of spacer pool components. The present invention can directly and quickly detect indexes in multiple dimensions such as the diffusivity, dirt-holding capacity and energy-saving performance of the membrane element flow channel spacer; the structure of the present invention is simple, the manufacturing cost is low, and various instruments are not required. Only a material barrel, a feed pump, a spacer pool and supporting pipelines and valves are needed; the operating pressure of the present invention is low, the requirement for the pressure-resistant grade of materials is low, and transparent organic materials such as acrylic plates and glass can be used, and high-pressure-resistant stainless steel is not required; the requirement for sealing and fixing of the present invention is also low, and only a simple clamping and fixing mechanism is needed to achieve the sealing effect, and the operation is very simple.

Description

Technical Field

[0001] The present invention belongs to the technical field of membrane detection, and particularly relates to a membrane element flow channel spacer detection device and its application. Background Art

[0002] In a spiral wound membrane element, the concentrate spacer not only plays a role in supporting the flow channel and guiding the liquid, but also can be used as a turbulence promoter in the module. While effectively enhancing turbulence, it reduces the concentration polarization and fouling phenomenon on the membrane surface. However, while improving the mass transfer efficiency, the spacer increases the flow resistance of the fluid and the pressure loss, thereby increasing the energy consumption, and also brings local channeling, dead zones, etc. In order to make the membrane module further adapt to diversified application fields and extend the service life of the membrane element, the optimized design of the spacer is particularly important.

[0003] Currently, the evaluation methods for spacers mainly focus on geometric parameters such as spacer thickness, spacer pitch, inlet angle, and spacer shape, and there is little evaluation of their anti-fouling performance. It mostly focuses on using CFD technology to simulate the fluid distribution state of the feed liquid in the membrane element, and then evaluate the anti-fouling effect of the spacer on the module; or winding the spacer into the membrane sheet, and indirectly evaluating the anti-fouling performance of the spacer through the performance of the membrane element such as rejection rate, flux, and pressure drop.

[0004] "Visualization of Fluid Flow State inside Flat Membrane Module" (Wang Tao et al., CIESC Journal, Vol. 65, No. 1, pp. 71 - 77, January 2014) discloses a plexiglass membrane module made of transparent plexiglass, which is used to directly observe and test the hydrodynamic performance of different spacers. "V"-shaped grooves are left at both the inlet and outlet of the membrane module, so that the fluid is evenly distributed on the surface of the membrane module, eliminating the influence of the inlet and outlet. The spacer is installed in the middle rectangular area. The fluid is transported into the device from the inlet through a peristaltic pump, and then converges to the outlet and flows out of the device from the outlet. Pressure gauges are installed on both the inlet pipeline and the outlet pipeline of the device to detect the inlet and outlet pressures and calculate the pressure loss of the fluid after passing through the spacer. However, in the actual use process, this technical solution has many defects: 1) Short-circuit phenomenon, the distribution of the water flow is very uneven, mainly concentrated in the center line position of the inlet and outlet, with less water volume and slower water flow on both sides; 2) It has very strict requirements for the levelness. The whole flow channel is flat. If the device is slightly inclined in the direction perpendicular to the water flow, under low flow velocity conditions, the water flow will be distributed unevenly more seriously, that is, the water flow at the lower position is concentrated and the flow velocity is fast, while the water flow at the higher position is slow and the diffusion is poor; 3) The parameters detected by the device are single, and it can only detect the fluid pressures before and after, and calculate the pressure loss ΔP in the flow channel. However, since the spacer area detected is very small relative to the membrane element, the pressure loss is very small and almost undetectable; 4) The detection method is to take pictures and visually observe to determine the lowest flow velocity at which the tracer diffuses. However, according to the actual detection results, the influence of the spacer structure is much greater than that of the flow velocity. That is, for a diamond-shaped spacer, diffusion can occur at a very low flow velocity, while for a parallel spacer, the diffusion effect is still relatively poor at a high flow velocity.

[0005] CN204563945U discloses a device for selecting the type of feed flow channel network, including a storage tank, a feed pump, a fixer for the flow channel network, an inlet pressure gauge and an outlet pressure gauge. The device calculates the pressure loss by detecting the inlet and outlet pressures. If the pressure difference is between 0.045 and 0.055 MPa, the spacer type selection is suitable. If the pressure difference is less than 0.045 MPa, it means that the selected spacer is too large and a spacer with a narrower flow channel needs to be selected. If the pressure difference is greater than 0.055 MPa, it means that the selected spacer is too small and a spacer with a wider flow channel needs to be selected until the inlet and outlet pressure difference of the selected spacer is within the range. The defects of this type selection device are as follows: 1) The detected parameters are single, and it can only detect the pressures before and after the device and calculate the pressure loss ΔP in the flow channel. However, since the spacer area detected is very small relative to the membrane element, the pressure loss is very small and almost undetectable; 2) The function is single, and it can only be used to screen the spacer thickness. For other performance parameters of the spacer (such as diffusivity, fouling resistance, etc.), they cannot be detected on one device and need to be made into a complete membrane element, and the performance of the spacer is evaluated through the detection results of the membrane element.

[0006] CN106731864B discloses a device for detecting the anti-pollution property of a dense net, which comprises a lower template, a positioning slider A, a positioning slider B and an upper template. An arc-shaped boss is arranged on the upper end surface of the lower template, and a water production outlet A penetrating through the arc-shaped boss is arranged on the lower end surface of the lower template. An arc-shaped groove is arranged on the lower end surface of the upper template, and a water production outlet B communicating with the arc-shaped groove is arranged on the upper end surface. A raw water inlet and a concentrated water outlet communicating with the arc-shaped groove are respectively arranged at two ends of the upper template. The positioning slider A and the positioning slider B are symmetrically arranged on both sides of the arc-shaped boss and the arc-shaped groove of the lower template and the upper template respectively, and together with the lower template and the upper template, form a cavity. A dense net and two membrane sheets located on both side surfaces of the dense net are respectively arranged in the cavity. Through observing the pollution degree of the dense net in the present invention, the anti-pollution property of the dense net can be understood. If the lower template and the upper template are made of transparent organic glass, the whole process of the anti-pollution of the dense net can be understood more clearly and accurately. However, the defects of this technical solution are as follows: 1) The operation process of a real spiral wound membrane element is simulated. However, since the feed liquid needs to penetrate the membrane layer to produce water, the requirement for the pressure resistance level of the device is high. The operating pressure of a microfiltration-level membrane sheet is at least above 3 bar. If it is a reverse osmosis membrane, the operating pressure is at least above 15 bar. The requirements for the fixation and sealing between the upper and lower templates are very high. If the material of the template is selected as transparent organic glass, the pressure resistance level is insufficient and it is easy to crack. If stainless steel is used, the pollution process cannot be observed and the practical operation performance is poor, and it is very difficult to achieve; 2) The pollution process is slow and the test period is long. Since this device restores the operation process of the real membrane element to the greatest extent, the concentration configuration of the simulated feed liquid also needs to be close to the operation conditions of the membrane element. A high suspended particulate matter system cannot be configured, otherwise the flow channel will be blocked due to fouling and the experiment cannot continue. The membrane fouling takes a relatively long time, and at least one day of operation is required for one cycle. Summary of the Invention

[0007] The purpose of the present invention is to overcome the defects of the prior art and provide a device for detecting the spacer grid in the flow channel of a membrane element.

[0008] Another purpose of the present invention is to provide a method for detecting the spacer grid in the flow channel of a membrane element.

[0009] The technical solution of the present invention is as follows:

[0010] A device for detecting the spacer grid in the flow channel of a membrane element, comprising a frame, a feed tank, a feed pump and a plurality of spacer grid pool assemblies;

[0011] Each spacer grid pool assembly comprises a body, a sealing ring, an upper cover and a plurality of clamping mechanisms. The upper cover is covered on the body through the sealing ring, and the plurality of clamping mechanisms clamp the body and the upper cover. Both the body and the upper cover are transparent, wherein

[0012] A groove is recessed on the body. The groove is sequentially divided into a feeding area, a separator net placement area, and a discharging area from one end to the other end along its length direction. The shape of the feeding area is semi-circular, and the shape of the discharging area is an isosceles triangle. The depth of the feeding area is greater than that of the separator net placement area, and the depth of the discharging area is the same as that of the separator net placement area. A feeding port is provided on the bottom wall at one end of the groove, and a diversion baffle is protruded on the bottom wall of the feeding area downstream of the feeding port. A discharging port is provided on the bottom wall at the other end of the groove;

[0013] The upper cover has a tracer inlet, which corresponds to the feeding area of the body and inserts a silica gel capillary tube. One end of the silica gel capillary tube is connected to an injection device for injecting the tracer, and the other end is inserted under the upper cover and faces the edge of the separator net placement area of the body that is connected to the feeding area;

[0014] A number of separator net pool components are arranged on the rack and are arranged in parallel. The feed tank is connected to the feeding ports of the number of separator net pool components through a feed pump, and the discharging ports of the number of separator net pool components are connected to the feed tank. The feed tank is filled with a detection liquid;

[0015] In a preferred embodiment of the present invention, at least two positioning grooves are provided on the body, and at least two positioning protrusions adapted to the two positioning grooves are provided on the upper cover.

[0016] In a preferred embodiment of the present invention, the number of clamping mechanisms is a G clamp.

[0017] In a preferred embodiment of the present invention, a transition slope is provided at the junction of the feeding area and the separator net placement area.

[0018] In a preferred embodiment of the present invention, the depth of the feeding area is 5-15 mm, and the depth of the separator net placement area is 2-5 mm.

[0019] Further preferably, the depth of the feeding area is 10 mm, and the depth of the separator net placement area is 6.5 mm.

[0020] In a preferred embodiment of the present invention, at least one gasket is further provided in the separator net placement area to adapt to separator nets of different thicknesses.

[0021] Further preferably, the thickness of the at least one gasket is 0.2-3 mm.

[0022] Another technical solution of the present invention is as follows:

[0023] A method for detecting a separator net of a membrane element flow channel uses a membrane element flow channel separator net detection device to detect the fouling resistance performance, diffusion performance, and energy-saving performance of a separator net of a membrane element to be detected.

[0024] In a preferred embodiment of the present invention, when detecting the fouling resistance of the flow channel spacer of the membrane element, it is characterized by testing the difference in turbidity of the detection liquid before and after; when detecting the diffusion performance of the flow channel spacer of the membrane element, it is characterized by testing the diffusion degree of the detection liquid stained with a tracer; when detecting the energy-saving performance of the flow channel spacer of the membrane element, it is characterized by testing the difference in the flow rate of the detection liquid through the spacer.

[0025] The beneficial effects of the present invention are as follows:

[0026] 1. The present invention can directly and quickly detect indexes in multiple dimensions such as the diffusivity, fouling resistance, and energy-saving performance of the flow channel spacer of the membrane element.

[0027] 2. The structure of the present invention is simple, with low manufacturing cost. Without various instruments, only a material bucket, a feed pump, a spacer pool, and supporting pipelines and valves are needed.

[0028] 3. The operating pressure of the present invention is low, and the requirement for the pressure resistance level of the material is low. Transparent organic materials such as acrylic plates and glass can be used, and high-pressure-resistant stainless steel is not required.

[0029] 4. The requirement for sealing and fixing of the present invention is also low. Only a simple clamping and fixing mechanism is needed to achieve the sealing effect, and the operation is very simple. Brief Description of the Drawings

[0030] Figure 1 It is a schematic structural diagram of the flow channel spacer detection device of the membrane element in Embodiment 1 of the present invention.

[0031] Figure 2 It is a three-dimensional structural diagram of the flow channel spacer detection device of the membrane element in Embodiment 1 of the present invention.

[0032] Figure 3 It is a three-dimensional structural diagram of the spacer pool assembly in Embodiment 1 of the present invention.

[0033] Figure 4 It is a schematic structural diagram of the body of the spacer pool assembly in Embodiment 1 of the present invention.

[0034] Figure 5 It is a schematic structural diagram of the upper cover in Embodiment 1 of the present invention.

[0035] Figure 6 It is one of the experimental result diagrams of Embodiment 2 of the present invention.

[0036] Figure 7 It is the second experimental result diagram of Embodiment 2 of the present invention.

[0037] Figure 8 It is the third experimental result diagram of Embodiment 2 of the present invention.

[0038] Figure 9 It is the fourth experimental result diagram of Embodiment 2 of the present invention.

[0039] Figure 10 It is one of the experimental result diagrams of Embodiment 3 of the present invention.

[0040] Figure 11 It is the second experimental result diagram of Embodiment 3 of the present invention.

[0041] Figure 12 It is a photo of the septum sample in Embodiment 4 of the present invention.

[0042] Figure 13 It is the experimental result diagram of Embodiment 4 of the present invention. Specific Embodiments

[0043] The technical solution of the present invention will be further described and illustrated below through specific embodiments in conjunction with the accompanying drawings.

[0044] Embodiment 1

[0045] As Figure 1 and 2 shown, a membrane element flow channel septum detection device includes a frame 2, a material barrel 3, a feed pump 4, and two septum pool assemblies 1.

[0046] As Figure 3 and 4 shown, each septum pool assembly 1 includes a body 10, a sealing ring, an upper cover 13, and four G-type clamps 14. The upper cover 13 is covered on the body 10 through the sealing ring, and the four G-type clamps 14 clamp the body 10 and the upper cover 13. Both the body 10 and the upper cover 13 are transparent.

[0047] As Figure 4As shown, a groove body 101 is recessed on the main body 10, and the groove body 101 is divided into a feed area 1011, a screen placement area 1012 and a discharge area 1013 along its length direction from one end to the other end. The shape of the feed area 1011 is semicircular, and the shape of the discharge area 1013 is an isosceles triangle (its vertex angle is 90°-150°). The shape of the screen placement area 1012 is rectangular, the depth of the feed area 1011 is 10mm, and the depth of the screen placement area 1012 is 3.5mm (the maximum thickness of the membrane element flow path screen that can be tested is 120mil. If there is a thicker membrane element flow path screen, the depth of the groove body 101 can be increased as needed. When measuring membrane element flow path screens of different thicknesses, the number of gaskets can be increased or decreased in the screen placement area 1012 (thick gaskets are 2-3mm thick, and thin gaskets are 0.2-1mm thick) and selected as needed. The height is adjusted appropriately according to the corresponding type), the height difference between the feed area 1011 and the screen placement area 1012 is 6.5mm, the depth of the discharge area 1013 is consistent with the depth of the screen placement area 1012, a feed port 102 is provided on the bottom wall of one end of the tank body 101, a guide baffle 1014 is convexly provided on the bottom wall of the feed area 1011 downstream of the feed port 102, a discharge port 103 is provided on the bottom wall of the other end of the tank body 101, and a transition slope 1015 is provided at the junction of the feed area 1011 and the screen placement area 1012. If there are suspended particles in the test liquid, the suspended particles will hit the wall and fall when entering the screen placement area 1012, causing the suspended particles to be enriched in the feed area 1011. The provision of the transition slope 1015 can eliminate this effect.

[0048] The function of the feed area 1011 is to adjust the uniformity of the concentration and flow rate of the test liquid. Therefore, the larger the feed area 1011 is, the more conducive it is to evenly adjust the concentration and flow rate. However, it is also necessary to avoid a polygonal shape that would cause a dead zone in the flow. Therefore, its shape is set to be semicircular. The function of the guide baffle 1014 is to prevent the test liquid from forming a short flow in the line connecting the feed port 102 and the discharge port 103, so that the test liquid flows in the middle area of the screen to be tested, but does not flow on both sides.

[0049] like Figure 5 As shown, the upper cover 13 has a tracer inlet 130, which corresponds to the feed area 1011 of the body 10 and is inserted with a silicone capillary 132, one end of which is connected to the injection device 5 for injecting the tracer, and the other end is inserted under the upper cover 13 and faces the edge of the mesh placement area 1012 of the body 10 that is connected to the feed area 1011;

[0050] Two positioning grooves 104 are formed at two diagonal ends of the body 10 , and two positioning protrusions 131 adapted to fit in the two positioning grooves 104 are formed on the upper cover 13 .

[0051] As Figure 1 and 2 shown, the two-separated mesh tank assemblies 1 are arranged on the gantry 2 in parallel. The material barrel 3 is connected to the feed inlet 102 of the two-separated mesh tank assemblies 1 through the feed pump 4, and the discharge outlet 103 of the two-separated mesh tank assemblies 1 is connected to the material barrel 3. The material barrel 3 is filled with the detection liquid.

[0052] Embodiment 2

[0053] In this embodiment, the fouling resistance performance of the mesh is detected by using the mesh element flow channel mesh detection device of Embodiment 1, specifically as follows:

[0054] (1) Cut the mesh sample to a size adapted to the size of the mesh placement area 1012, place it in the mesh placement area 1012, place the sealing ring, cover the upper cover 13, and seal and fix it with the G-type clamp 14. Connect the pipelines between the material barrel 3, the feed pump 4, and the two-separated mesh tank assemblies 1 to form a closed circulation system;

[0055] (2) Prepare the detection liquid: Prepare the detection liquid with 25nm TiO2, with a volume of 1L of the detection liquid, and measure the turbidity T0;

[0056] (3) Turn on the feed pump 4, adjust the flow rate, record the running time, turn off the feed pump 4, and measure the turbidity T of the suspension in the material barrel 3 i ;

[0057] (4) Calculate the rejection rate R = (T0 - T i ) / T0.

[0058] Optimal operating condition screening:

[0059] A. Detection liquid concentration screening

[0060] Compare the rejection rates of two meshes with the same thickness but different shapes. When other conditions are the same and the concentrations of the detection liquid are different, the difference in the rejection rate is the largest. Then the detection liquid with this concentration is most conducive to evaluating the fouling resistance performance of the mesh.

[0061] Table 1

[0062] Item 100 ppm 50 ppm 20 ppm 46 mil - Square rejection rate 60.26％ 56.47％ 66.25％ 46 mil - Diamond rejection rate 67.16％ 77.07％ 73.40％ 46 mil - Square throttling turbidity 323 131 64 46 mil - Diamond rejection turbidity 360 178.8 70.9 Turbidity rejection difference of different spacer meshes (NTU) 37 47.8 6.9

[0063] As shown in Table 1 below and Figure 6 shown, when the concentration of TiO2 in the detection liquid is 50ppm, the difference in the rejection rate of turbidity for the two meshes is the largest, with a turbidity rejection difference of 47.8 NTU. When it is 20ppm, the turbidity rejection difference is only 6.9 NTU. Therefore, the optimal concentration of the detection liquid is determined to be 50ppm.

[0064] B. Feed flow rate screening

[0065] Compare the rejection rates of two separator meshes with the same thickness but different shapes. When other conditions are the same and the feed flow rates are different, if the difference in rejection rates is stable and there is no longer a significant change, then this operating time is most conducive to evaluating the pollutant retention performance of the separator mesh.

[0066] As Figure 7 shown, at low flow rates, suspended particulate matter is likely to get stuck in the separator mesh and is not easily flushed out. Therefore, the difference in rejection rates between the two separator meshes is small. At high flow rates, the turbulence of the water flow is good, and suspended particulate matter is not easily settled. Some particulate matter will be carried out of the separator mesh, and the difference in rejection rates between the two separator meshes is large, which is more conducive to evaluating the pollutant retention performance of the separator mesh. The feed flow rate can be selected to be greater than 1.0 LPM, but there is already an obvious difference at 1.0 LPM. Considering energy conservation and the requirements of the device for high flow rates, 1.0 LPM is determined as the optimal operating flow rate.

[0067] C. Screening of feed time

[0068] Compare the rejection rates of two separator meshes with the same thickness but different shapes. When other conditions are the same and the cycle operating times are different, if the difference in rejection rates is stable and there is no longer a significant change, then this operating time is most conducive to evaluating the pollutant retention performance of the separator mesh.

[0069] As Figure 8 shown, when operating for 10 min, the difference in rejection rates is not significant. When operating for 30 min, the difference in rejection rates is relatively large, and as the operating time extends, the difference in rejection rates does not change significantly. Then, 30 min is determined as the optimal operating duration, which is more conducive to evaluating the pollutant retention performance of the separator mesh.

[0070] Pollutant retention tests of several separator meshes: Use the determined optimal concentration of the detection feed liquid, optimal operating flow rate, and optimal operating duration as the determined parameters to test the pollutant retention performance of several separator meshes.

[0071] As Figure 9 shown, the retention of suspended particulate matter by some separator meshes was tested, and the evaluation results of the pollutant retention performance of the separator meshes were obtained: The separator mesh of the large corrugated plate has the least retention of pollutants. Under the same thickness, the rejection rate of the diamond-shaped separator mesh for suspended particulate matter is greater than that of the inclined and square separator meshes.

[0072] Example 3

[0073] In this example, the diffusion performance of the separator mesh of the membrane element flow channel in Example 1 was detected using the detection device, as follows:

[0074] (1) Cut the spacer grid sample and the membrane sample to the same size as the size of the spacer grid placement area 1012. First, place the membrane on the spacer grid placement area 1012 with the membrane surface facing up, then place the spacer grid to be tested above the membrane, place the sealing ring properly, cover the upper cover 13, and fix it tightly with the G-type clamp 14. Connect the pipelines between the material bucket 3, the feeding pump 4, and the two-spacer grid pool assembly 1 to form a closed circulation system;

[0075] (2) Use pure water as the detection liquid, start the feeding pump 4, and adjust the flow rate to make the system run stably;

[0076] (3) Prepare a video camera, adjust the focus and viewing angle, and start recording;

[0077] (4) Inject the red ink tracer into the silica capillary 132 with an injection device and observe the diffusion situation;

[0078] (5) Play back the video, capture the picture of the diffusion to the widest distance, calculate the number of grids N crossed, and measure the diffusion width D.

[0079] The test results are as shown in Table 2 below and Figures 10 to 11 As shown, the diffusivity of the square spacer grid is relatively poor. At the same Reynolds number, the number of grids crossed is small and the diffusion width is small; the diffusivity of the diamond-shaped spacer grid is good, and its diffusion effect is very good and relatively close at both high and low Reynolds numbers. The diffusion characteristics are related to the configuration of the spacer grid: the longitudinal strips of the square spacer grid are thick and the transverse strips are thin, and the flow direction of the fluid will be relatively concentrated across the transverse strips, and it is difficult for longitudinal strip transitions to occur; the transverse and longitudinal strips of the diamond-shaped spacer grid are of the same thickness, the water inlet angle is 90°, and the nodes of the transverse and longitudinal strips are thick and the flow channels are thin, and the water flow diffuses relatively evenly in all directions, but the relative resistance will be relatively large.

[0080] Table 2

[0081]

[0082] Example 4

[0083] In this example, the energy-saving performance of the spacer grid is detected by using the spacer grid detection device for the membrane element flow channel of Example 1, which is specifically as follows:

[0084] (1) Cut different spacer grid samples (as Figure 12 shown) and membrane samples to the same size as the size of the spacer grid placement area 1012. First, place the membrane on the spacer grid placement area 1012 with the membrane surface facing up, then place the spacer grid to be tested above the membrane, place the sealing ring 11 properly, cover the upper cover 13, and fix it tightly with the G-type clamp 14. Connect the pipelines between the material bucket 3, the feeding pump 4, and the two-spacer grid pool assembly 1 to form a closed circulation system;

[0085] (2) Use pure water as the detection liquid, start the feeding pump 4, and adjust it to the maximum flow rate to make the system run stably;

[0086] (3) Measure the water production volume Q of each group of partition net pool components 1 in 1 minute with a graduated cylinder and a stopwatch. i ; When the measured partition net resistance is close, the water production time can be appropriately extended for more obvious differences.

[0087] (4) Compare the magnitudes of the water production volumes, determine the magnitudes of the partition net resistances, and finally judge the energy-saving performance of the partition nets.

[0088] Test results Figure 13 As shown, for partition nets with the same thickness but different structures, there are significant differences in their resistances. Under the condition of equal flow-through pressure, for the two parallel partition net pool components 1, the flow rate on the side with smaller resistance is larger, and the flow rate on the side with larger resistance is smaller. Through this simple device and rapid qualitative test method, when the water production volume of one side of the partition net is large, it can be qualitatively determined that the resistance of the partition net on this side is small, and the resistance of the prepared component to the fluid is small, with a small pressure drop, so it is more energy-saving.

[0089] The above is only a preferred embodiment of the present invention, and thus the scope of implementation of the present invention cannot be limited thereby. That is, equivalent changes and modifications made according to the scope of the present invention patent and the content of the specification should still fall within the scope covered by the present invention.

Claims

1. A membrane element flow channel spacer detection device, characterized in that: It is used to detect the pollution holding performance, diffusion performance and energy saving performance of the flow channel screen of the membrane element to be tested, including a stand, a material barrel, a feed pump and several screen tank components; Each screen pool assembly includes a body, a sealing ring, an upper cover and a plurality of clamping mechanisms. The upper cover is covered on the body through the sealing ring, and the plurality of clamping mechanisms clamp the body and the upper cover. Both the body and the upper cover are transparent. A trough body is recessed on the main body, and the trough body is divided into a feeding area, a screen placement area and a discharging area in sequence from one end to the other end along its length direction. The shape of the feeding area is semicircular, and the shape of the discharging area is an isosceles triangle. The depth of the feeding area is greater than the depth of the screen placement area, and the depth of the discharging area is consistent with the depth of the screen placement area. A feeding port is provided on the bottom wall of one end of the trough body, and a guide baffle is convexly provided on the bottom wall of the feeding area downstream of the feeding port, and a discharging port is provided on the bottom wall of the other end of the trough body; a transition slope is provided at the junction of the feeding area and the screen placement area, the depth of the feeding area is 10mm, the depth of the screen placement area is 3.5mm, and the height difference between the feeding area and the screen placement area is 6.5mm; The upper cover has a tracer inlet, which corresponds to the feed area of the body and is provided with a silicone capillary, one end of which is connected to an injection device for injecting the tracer, and the other end of which is inserted under the upper cover and faces the edge of the mesh placement area of the body connected to the feed area; A plurality of screen-separating pool components are arranged on a platform and in parallel, a material barrel is connected to the feed ports of the plurality of screen-separating pool components through a feed pump, and a plurality of discharge ports of the plurality of screen-separating pool components are connected to the material barrel, and the material barrel is filled with a test liquid.

2. The membrane element flow channel spacer detection device according to claim 1, wherein: The body is provided with at least two positioning grooves, and the upper cover is provided with at least two positioning protrusions matched with the two positioning grooves.

3. The membrane element flow channel spacer detection device according to claim 1, characterized in that: The plurality of clamping mechanisms are G-type clamps.

4. The membrane element flow channel spacer detection device according to claim 1, characterized in that: At least one gasket is also arranged in the partition net placement area to accommodate partition nets of different thicknesses.

5. The membrane element flow channel spacer detection device according to claim 4, characterized in that: The thickness of the at least one gasket is 0.2-3 mm.

6. A method for detecting the flow channel spacer of a membrane element, characterized in that: The membrane element flow channel screen detection device described in any one of claims 1 to 5 is used to detect the pollution holding performance, diffusion performance and energy-saving performance of the flow channel screen of the membrane element to be tested.

7. A method for detecting the flow channel spacer of a membrane element according to claim 6, characterized in that: When testing the pollution absorption performance of the membrane element flow channel partition, it is characterized by testing the difference in turbidity before and after the test liquid; when testing the diffusion performance of the membrane element flow channel partition, it is characterized by testing the diffusion degree of the test liquid dyed with a tracer; when testing the energy-saving performance of the membrane element flow channel partition, it is characterized by testing the difference in the flow rate of the test liquid to the partition.

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