CN114632425A - Membrane element flow passage separation net detection device and application thereof - Google Patents

Abstract

The invention discloses a membrane element flow passage screen detection device and application thereof. The invention can directly and rapidly detect the indexes of a plurality of dimensions such as diffusivity, pollutant carrying property, energy saving property and the like of the membrane element flow passage separation net; the invention has simple structure and low manufacturing cost, does not need various instruments, and only needs the charging barrel, the charging pump, the separation net tank, the matched pipeline and the valve; the invention has low operation pressure and low requirement on the pressure-resistant grade of the material, can use transparent organic materials such as a subgrid plate, glass and the like, and does not need to use stainless steel with high pressure-resistant grade; the invention has low requirement on sealing and fixing, can achieve the sealing effect only by adopting a simple clamping and fixing mechanism, and has very simple and convenient operation.

Description

Membrane element flow channel separator net detection device and its application

technical field

The invention belongs to the technical field of membrane detection, and in particular relates to a membrane element flow channel separator detection device and its application.

Background technique

In the roll-type membrane element, the concentrated water separator not only plays the role of supporting the flow channel and diverting the liquid, but also can be used as a turbulence promoter in the module, which can effectively strengthen the turbulence and reduce the concentration polarization on the membrane surface. pollution phenomenon. However, while improving the mass transfer efficiency, the separation net increases the flow resistance of the fluid and the pressure loss, thereby increasing the energy consumption, and also brings local channel flow, dead zone and so on. In order to further adapt the membrane module to diversified application fields and prolong the service life of the membrane element, the optimal design of the separator is particularly important.

At present, the evaluation methods of separators mainly focus on geometric parameters such as the thickness of the separators, the spacing of the separators, the angle of water entry and the shape of the separators, while the evaluation of its anti-pollution performance is seldom, and most of them focus on the use of CFD technology to simulate the inner material of membrane elements The fluid distribution state of the liquid, and then evaluate the anti-fouling effect of the separator on the module; or roll the separator into the membrane sheet, and indirectly evaluate the anti-fouling of the separator through the retention rate, flux, pressure drop and other properties of the membrane element. polluting properties.

"Visualization of Fluid Flow State in Flat Membrane Modules" (Wang Tao et al., Chinese Journal of Chemical Industry, Vol. 65, No. 1, Pages 71-77, January 2014) discloses a plexiglass membrane module consisting of transparent plexiglass Made for direct observation and testing of the hydrodynamic properties of different separators. There are "V"-shaped grooves at the inlet and outlet of the membrane module, so that the fluid is evenly distributed on the surface of the membrane module and eliminates the influence of the inlet and outlet. The partition screen is installed in the middle rectangular area. The fluid is transported into the device from the water inlet through the peristaltic pump, and then collected to the water outlet from the water outlet. pressure, and calculate the pressure loss after the fluid passes through the screen. However, in the actual use process, this technical solution has many defects: 1) short flow phenomenon, the distribution of water flow is very uneven, mainly concentrated in the centerline of the water inlet and water outlet, and the water volume on both sides is small and the water flow is slow; 2 ) The levelness requirements are very strict, the entire flow channel is flat, and the device is slightly inclined in the vertical direction to the water flow. Under the condition of low flow rate, the water flow will have a serious uneven distribution, that is, the low-level water flow is concentrated and the flow rate is fast. , the high-level water flow is slow and the diffusion is poor; 3) The parameters detected by the device are single, only the fluid pressure before and after can be detected, and the pressure loss ΔP in the flow channel is calculated. However, since the detected screen area is very small compared to the membrane element, the pressure loss is very small and can hardly be detected; 4) The detection method determines the minimum flow rate of the tracer diffusion by taking pictures and visual observation, but according to the actual detection It was found that the influence of the structure of the separator is far greater than that of the flow velocity, that is, the rhombic separator can produce diffusion at very low flow rates, but the diffusion effect of parallel separators is still relatively poor at high flow rates.

CN204563945U discloses a type selection device for a feed flow channel network, including a material storage tank, a material delivery pump, a holder for the flow channel network, a feed pressure gauge and a discharge pressure gauge. The device calculates the pressure loss by detecting the pressure of the feeding and discharging materials. If the pressure difference is between 0.045 and 0.055MPa, the screen selection is suitable. If the pressure difference is less than 0.045MPa, it means that the screen selection is too large and needs to be Select a spacer with a narrower flow channel. If the pressure difference is greater than 0.055MPa, it means that the type of the spacer is too small, and a spacer with a wider flow channel needs to be selected until the pressure difference between the feed and discharge of the selected spacer is within the range. Inside. The defects of this type selection device are: 1) The detection parameters are single, and only the pressure before and after the device can be detected, and the pressure loss ΔP in the flow channel can be calculated. However, since the area of the screen to be tested is very small compared to the membrane element, the pressure loss is very small and can hardly be measured; 2) The function is single and can only be used to screen the thickness of the screen. For other performance parameters of the screen (such as Diffusion, dirt holding capacity, etc.) cannot be tested on one device, and a completed membrane element needs to be made, and the performance of the separator is evaluated by the test results of the membrane element.

CN106731864B discloses a device for detecting the anti-pollution property of thick nets, comprising a lower template, a positioning slider A, a positioning slider B and an upper template. The upper end face of the lower template is provided with an arc-shaped boss, and the The lower end face is provided with a water production outlet A that penetrates the arc-shaped boss, the lower end face of the upper template is provided with an arc-shaped groove, the upper end face is provided with a water-produced outlet B that communicates with the arc-shaped groove, and the two ends of the upper template are respectively There are raw water inlets and concentrated water outlets that communicate with the arc-shaped grooves. The positioning slider A and the positioning slider B are symmetrically arranged on both sides of the arc-shaped bosses and arc-shaped grooves of the lower template and the upper template, and are connected with the arc groove. The lower template and the upper template together form a cavity, and the cavity is respectively provided with a thick screen and two diaphragms located on both sides of the thick screen. By observing the pollution degree of the thick net in the present invention, the anti-pollution property of the thick net can be known. If the lower template and the upper template are made of transparent plexiglass, the whole process of anti-pollution of the thick net can be understood more clearly and accurately. However, the defects of this technical solution are: 1) It simulates the operation process of the real rolled membrane element, but since the feed liquid must penetrate the membrane layer to produce water, the pressure resistance level of the device is required to be high, and the microfiltration level membrane The operating pressure should be at least 3 bar or more, and if it is a reverse osmosis membrane, the operating pressure should be at least 15 bar or more, and the requirements for fixing and sealing between the upper and lower formwork are very high. , easy to crack, and the pollution process cannot be observed with stainless steel, which is difficult to achieve due to poor practicality; 2) The pollution process is slow and the test period is long. Because the device restores the operation process of the real membrane element to the greatest extent, it simulates the liquid The concentration configuration of the membrane element should also be close to the operating conditions of the membrane element, and a system with high suspended particulate matter cannot be configured, otherwise the flow channel will be blocked due to fouling and the experiment will not be able to continue.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the defects of the prior art, and to provide a membrane element flow channel separator net detection device.

Another object of the present invention is to provide a method for detecting a membrane element flow channel separator.

The technical scheme of the present invention is as follows:

A membrane element flow channel separation net detection device, comprising a stand, a material bucket, a feed pump and several separation net pool components;

Each net-separating pool assembly includes a main body, a sealing ring, an upper cover and several clamping mechanisms. The upper cover is covered on the main body through the sealing ring, and several clamping mechanisms clamp the main body and the upper cover, the main body and the upper cover. are transparent, with

A groove body is recessed on the main body, and the groove body is divided into a feeding area, a mesh placing area and a discharging area in turn from one end to the other along its length direction. The shape of the feeding area is an isosceles triangle, the depth of the feeding area is greater than the depth of the screen placing area, the depth of the discharging area is consistent with the depth of the dividing screen placing area, the bottom wall of one end of the tank body is provided with a feeding port, A guide baffle is protruded from the bottom wall of the feed zone downstream of the feed port, and a discharge port is provided on the bottom wall of the other end of the tank body;

The upper cover has a tracer inlet, the tracer inlet corresponds to the feeding area of the body and a silica gel capillary is inserted, one end of the silica gel capillary is connected to the injection device for injecting the tracer, and the other end is inserted under the upper cover and is To the edge of the screen placement area of the body that is connected to the feeding area;

A plurality of net-separation pool components are arranged on the stand and are arranged in parallel, the material barrel is connected to the feed ports of the plurality of net-separation pool components through the feeding pump, and the discharge ports of the plurality of net-separation pool components are connected to the material barrel, and the material barrel is equipped with a detection material liquid. .

In a preferred embodiment of the present invention, the body is provided with at least two positioning grooves, and the upper cover is provided with at least two positioning protrusions that fit in the two positioning grooves.

In a preferred embodiment of the present invention, the plurality of clamping mechanisms are G-clamps.

In a preferred embodiment of the present invention, a transition slope is provided at the junction of the feeding zone and the separating net placement zone.

In a preferred embodiment of the present invention, the depth of the feeding zone is 5-15mm, and the depth of the screen placement zone is 2-5mm.

Further preferably, the depth of the feeding zone is 10 mm, and the depth of the screen placement zone is 6.5 mm.

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

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

Another technical scheme of the present invention is as follows:

A membrane element flow channel partition detection method, using the membrane element flow channel partition detection device according to any one of claims 1 to 8 to detect the dirt holding performance and diffusion performance of the membrane element flow channel partition to be tested. and energy saving performance.

In a preferred embodiment of the present invention, when testing the dirt-holding performance of the membrane element flow channel separator, it is characterized by the difference in turbidity before and after testing the material liquid; when testing the diffusion performance of the membrane element flow channel separator, It is characterized by testing the diffusion degree of the test material dyed with the tracer; when testing the energy-saving performance of the membrane element flow channel separator, it is characterized by testing the difference in the flow rate of the test material liquid by the separator.

The beneficial effects of the present invention are:

1. The present invention can directly and quickly detect indicators of multiple dimensions such as the diffusivity, dirt-holding capacity, and energy-saving performance of the membrane element flow channel separator.

2. The structure of the present invention is simple, the production cost is low, and all kinds of instruments are not needed, only the feeding barrel, the feeding pump, the separation net pool, the supporting pipeline and the valve are required.

3. The operating pressure of the present invention is low, and the pressure resistance level of the material is low, and transparent organic materials such as sub-grid and glass can be used, and stainless steel with a high pressure resistance level is not required.

4. The present invention also has low requirements for sealing and fixing, and only needs to adopt a simple clamping and fixing mechanism to achieve the sealing effect, and the operation is very simple.

Description of drawings

FIG. 1 is a schematic structural diagram of a membrane element flow channel separator detection device according to Embodiment 1 of the present invention.

FIG. 2 is a schematic three-dimensional structural diagram of the membrane element flow channel separator screen detection device according to Embodiment 1 of the present invention.

FIG. 3 is a schematic three-dimensional structure diagram of a net-separating pool assembly in Example 1 of the present invention.

FIG. 4 is a schematic structural diagram of the body of the net-separating pool assembly in Embodiment 1 of the present invention.

FIG. 5 is a schematic structural diagram of the upper cover in Embodiment 1 of the present invention.

FIG. 6 is one of the experimental result diagrams of Example 2 of the present invention.

FIG. 7 is the second diagram of the experimental results of Example 2 of the present invention.

FIG. 8 is the third diagram of the experimental results of Example 2 of the present invention.

FIG. 9 is the fourth diagram of the experimental results of Example 2 of the present invention.

FIG. 10 is one of the experimental result diagrams of Example 3 of the present invention.

FIG. 11 is the second diagram of the experimental results of Example 3 of the present invention.

Figure 12 is a photograph of a sample of the separator in Example 4 of the present invention.

FIG. 13 is an experimental result diagram of Example 4 of the present invention.

Detailed ways

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

Example 1

As shown in Figures 1 and 2, a membrane element flow channel separation net detection device includes a stand 2, a material barrel 3, a feed pump 4 and two separation net pool assemblies 1.

As shown in FIGS. 3 and 4 , each net-separating pool assembly 1 includes a main body 10 , a sealing ring 11 , an upper cover 13 and four G-type clips 14 , and the upper cover 13 is covered on the main body 10 through the sealing ring 11 , In addition, the four G-type clips 14 clamp the main body 10 and the upper cover 13, and both the main body 10 and the upper cover 13 are transparent.

As shown in FIG. 4 , a groove body 101 is recessed on the main body 10 , and the groove body 101 is divided into a feeding area 1011 , a mesh placing area 1012 and a discharging area in turn from one end to the other end along the length direction of the groove body 101 . The shape of the zone 1013, the feed zone 1011 is a semicircle, and the shape of the discharge zone 1013 is an isosceles triangle (its apex angle is 90°-150°). The shape of the spacer placement area 1012 is a rectangle, the depth of the feeding area 1011 is 10mm, and the depth of the spacer placement area 1012 is 3.5mm (the membrane element flow channel spacer with a thickness of up to 120mil can be tested, if there is a larger thickness The membrane element flow channel separator can increase the depth of the tank body 101 as required. When measuring membrane element flow channel separators with different thicknesses, the number of gaskets can be increased or decreased in the separator placement area 1012 (thick gaskets 2- 3mm thickness, thin gasket 0.2-1mm thickness) and adjust the appropriate height according to the corresponding type), the drop between the feeding area 1011 and the screen placement area 1012 is 6.5mm, the depth of the discharge area 1013 and the screen The depth of the placement area 1012 is the same. The bottom wall of one end of the tank body 101 is provided with a feeding port 102, and the bottom wall of the feeding area 1011 downstream of the feeding port 102 is protruded with a guide baffle 1014. The tank body 101 The bottom wall of the other end is provided with a discharge port 103, and a transition slope 1015 is provided at the junction of the feeding area 1011 and the screen placing area 1012. If there are suspended particles in the detected feed liquid, the suspended particles will fall off the wall when entering the screen placement area 1012, resulting in the phenomenon that suspended particles are enriched in the feeding area 1011. After setting the transition slope 1015, this can be eliminated. an impact.

The function of the above-mentioned feeding area 1011 is to adjust the uniformity of the concentration and flow rate of the detected feed liquid. Therefore, the larger the water inlet area 1011, the more favorable it is to mix the concentration and flow rate. Set its shape to a semicircle. The function of the above-mentioned deflector baffle 1014 is to avoid the phenomenon that the detection material liquid forms a short flow in the connection line between the feed port 102 and the discharge port 103, so that the material is fed in the middle area of the separator to be tested, and the material is not fed on both sides.

As shown in FIG. 5 , the upper cover 13 has a tracer inlet 130 , the tracer inlet 130 corresponds to the feeding area 1011 of the main body 10 and a silica gel capillary 132 is inserted, and one end of the silica gel capillary 132 is connected to inject the tracer The other end of the injection device 5 is inserted under the upper cover 13 and faces the edge of the screen placement area 1012 of the main body 10 that is connected to the feeding area 1011;

Two locating grooves 104 are provided at two diagonal ends of the main body 10 , and two locating protrusions 131 are provided on the upper cover 13 that fit into the two locating grooves 104 .

As shown in FIGS. 1 and 2 , the two-separation net pool assembly 1 is arranged on the stand 2 and is arranged in parallel, the material barrel 3 is connected to the feed port 102 of the second-separation net pool assembly 1 through the feed pump 4 , and the second net-separation pool assembly 1 The discharge port 103 is connected to the material barrel 3, and the material barrel 3 is equipped with a detection material liquid.

Example 2

This embodiment uses the membrane element flow channel separator screen detection device of Example 1 to detect the dirt-holding performance of the separator screen, which is as follows:

(1) Cut the sample of the partition mesh, the size is suitable for the size of the partition mesh placement area 1012, put it in the partition mesh placement area 1012, place the sealing ring 11, cover the upper cover 13, and seal and fix it with the G-clamp 14 , connect the pipelines between the feeding barrel 3, the feeding pump 4, and the two-separation net pool assembly 1 to form a closed circulation system;

(2) Preparation of detection feed liquid: the detection feed liquid is prepared with 25nm TiO ₂ , the volume of the detection feed liquid is 1L, and the turbidity T ₀ is measured;

(3) open feed pump 4, adjust flow rate, record running time, close feed pump 4, measure the turbidity T _i of the suspension in feed barrel 3;

(4) Calculate the retention rate R=(T ₀ -T _i )/T ₀ .

Best Operating Conditions Screening:

A. Screening of liquid concentration detection

Comparing the retention rates of the two types of separators with the same thickness and different shapes, when other conditions are the same and the concentrations of the detected feed liquid are different, the difference in the retention rates is the largest, and the detection feed liquid of this concentration is most conducive to evaluating the separators. dirt holding performance.

Table 1

project 100ppm 50ppm 20ppm 46mil-square rejection rate 60.26% 56.47% 66.25% 46mil-diamond rejection 67.16% 77.07% 73.40% 46mil-square throttling turbidity 323 131 64 46mil-rhombus retention turbidity 360 178.8 70.9 Turbidity retention difference (NTU) of different separators 37 47.8 6.9

As shown in Table 1 and Figure 6 below, when the concentration of TiO ₂ in the detected feed liquid is 50ppm, the difference in the turbidity retention rate of the two separators is the largest, and the turbidity retention difference is 47.8NTU. When 20ppm, the turbidity The degree of rejection difference is only 6.9NTU. Therefore, it is determined that the concentration of the best detection feed liquid is 50 ppm.

B. Screening of feeding flow rate

Comparing the retention rates of the two types of separators with the same thickness and different shapes, when other conditions are the same and the feed flow rates are different, the difference in retention rates is stable and there is no significant change, then the operating time is the most efficient. It is helpful to evaluate the dirt holding performance of the separator.

As shown in Figure 7, in the case of low flow rate, suspended particles are easily stuck in the separator and are not easily flushed out, so the difference in retention rate between the two separators is small. It is not easy to settle, and part of the particles will be taken out of the separator. The interception rate of the two separators is very different, which is more conducive to evaluating the dirt-holding performance of the separator. The feed flow rate can be selected to be larger than 1.0LPM, but there are obvious differences under the condition of 1.0LPM, and considering the requirements of energy saving and high flow rate for the device, 1.0LPM is determined as the optimal operating flow rate.

C. Screening of feeding time

Comparing the retention rates of the two types of separators with the same thickness and different shapes, when other conditions are the same and the cycle running time is different, the difference in the retention rate is stable and there is no significant change, then the running time is the most efficient. It is helpful to evaluate the dirt holding performance of the separator.

As shown in Figure 8, the difference in retention rate is not significant when running for 10 minutes. When running for 30 minutes, the difference in retention rate is relatively large, and with the extension of running time, the difference in retention rate does not change significantly, so 30 minutes is determined as the most The optimal operating time is more conducive to evaluating the dirt-holding performance of the separator.

Contamination-holding test of several kinds of separators: Test the dirt-holding capacity of several separators with the above-determined optimal concentration of the detection material, the best operating flow rate and the best operating time as the parameters.

As shown in Figure 9, the interception of suspended particulates by some of the separators was tested, and the evaluation result of the pollution holding capacity of the separators was obtained: the separators with large wave plates have the least interception of pollutants. Under the condition of the same thickness, the interception rate of the suspended particles by the diamond-shaped screen is larger than that of the oblique and square screen.

Example 3

This embodiment uses the membrane element flow channel separator screen detection device of Example 1 to detect the diffusion performance of the separator screen, as follows:

(1) Cut the sample of the partition screen and the sample of the film, the size is the same as the size of the spacer screen placement area 1012, first place the film sheet in the spacer screen placement area 1012 with the film surface facing up, and then place the spacer screen to be tested. Put it on the top of the diaphragm, put the sealing ring 11, cover the upper cover 13, seal and fix it with the G-clamp 14, and connect the pipeline between the feeding barrel 3, the feeding pump 4, and the two-separator pool assembly 1. , forming a closed circulatory system;

(2) Use pure water as the detection feed liquid, turn on the feed pump 4, adjust the flow rate, and let the system run stably;

(3) Prepare the video camera, adjust the focal length and angle of view, and start the video recording;

(4) inject the red ink tracer into the silica gel capillary 132 with the injection device, and observe the diffusion;

(5) Play back the video, cut out the picture that spreads to the maximum distance, calculate the number N of grids spanned, and measure the spread width D.

The test results are shown in Table 2 below and Figures 10 to 11. The diffusivity of the square separator is relatively poor. Under the same Reynolds number, the number of spanning grids is small, and the diffusion width is small; the rhombic separator has good diffusivity, regardless of the high and low Reynolds numbers. The diffusion effects are all very good and relatively close. The characteristics of diffusion are related to the configuration of the separator: the vertical vitex of the square separator is thick and horizontal, and the flow direction of the fluid will be relatively concentrated. , and the horizontal and vertical vitex nodes are thick and thin, and the water flow is relatively uniform in all directions, but the relative resistance will also be relatively large.

Table 2

Example 4

This embodiment uses the membrane element flow channel separator screen detection device of Example 1 to detect the energy-saving performance of the separator screen, as follows:

(1) Cut different separator mesh samples (as shown in Figure 12) and film samples, the size is the same as the size of the separator screen placement area 1012, first place the membrane sheet in the separator screen placement area 1012, with the film side up , and then place the screen to be tested on the top of the diaphragm, put the sealing ring 11, cover the upper cover 13, seal and fix it with the G-clamp 14, and connect the feeding barrel 3, the feeding pump 4, and the second separator. The pipeline between the pool components 1 forms a closed circulation system;

(2) Use pure water as the detection feed liquid, turn on the feed pump 4, adjust to the maximum flow rate, and let the system run stably;

(3) Measure the water production Q _i in 1 min of each group of separator pool components 1 with a measuring cylinder and a stopwatch; when the resistance of the test separator is close, the water production time can be appropriately extended, and the difference is more obvious.

(4) Compare the size of water production, determine the resistance of the screen, and finally determine the energy-saving performance of the screen.

The test results are shown in Figure 13. The resistances of the meshes with the same thickness and different structures are quite different. When the overcurrent pressure is equal, the two meshes in parallel pool 1, the side with the smaller resistance has the larger overflow and the larger resistance. One side overflow is small. Through this simple device and rapid qualitative test method, when the water production of one side screen is large, it can be qualitatively determined that the resistance of the side screen is small, the prepared component has low resistance to fluid, and pressure drop Smaller and therefore more energy efficient.

The above descriptions are only preferred embodiments of the present invention, so the scope of implementation of the present invention cannot be limited accordingly. That is, equivalent changes and modifications made according to the patent scope of the present invention and the contents of the description should still be covered by the present invention. In the range.

Claims (10)

1. The utility model provides a membrane element runner separates net detection device which characterized in that: comprises a stand, a charging bucket, a feeding pump and a plurality of screen pool components;

each screen cell component comprises a body, a sealing ring, an upper cover and a plurality of clamping mechanisms, the upper cover is arranged on the body through the sealing ring cover, the plurality of clamping mechanisms clamp the body and the upper cover, the body and the upper cover are transparent, wherein,

the groove body is concavely provided with a groove body, the groove body is sequentially divided into a feeding area, a separation net placing area and a discharging area from one end to the other end along the length direction of the groove body, the feeding area is semicircular, the discharging area is isosceles triangle-shaped, the depth of the feeding area is greater than that of the separation net placing area, the depth of the discharging area is consistent with that of the separation net placing area, the bottom wall of one end of the groove body is provided with a feeding hole, the bottom wall of the feeding area at the downstream of the feeding hole is convexly provided with a flow guide baffle, and the bottom wall of the other end of the groove body is provided with a discharging hole;

the upper cover is provided with a tracer inlet, the tracer inlet corresponds to the feeding area of the body, a silica gel capillary is inserted in the feeding area, one end of the silica gel capillary is communicated with an injection device for injecting tracer, and the other end of the silica gel capillary is inserted below the upper cover and is opposite to the edge of the separation net placing area of the body, which is connected with the feeding area;

the plurality of screen pool components are arranged on the stand and are arranged in parallel, the charging bucket is communicated with the feeding holes of the plurality of screen pool components through a feeding pump, the discharging holes of the plurality of screen pool components are communicated with the charging bucket, and the charging bucket is internally provided with a detection feed liquid.

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

3. The membrane element flow channel spacer mesh detection device of claim 1, wherein: the clamping mechanisms are G-shaped clamps.

4. The membrane element flow channel spacer mesh detection device of claim 1, wherein: and a transition slope is arranged at the junction of the feeding area and the partition net placing area.

5. The membrane element flow channel spacer mesh detection device of claim 1, wherein: the depth of the feeding area is 5-15mm, and the depth of the mesh separation placing area is 2-5 mm.

6. The membrane element flow channel spacer mesh detection device of claim 5, wherein: the depth of the feeding area is 10mm, and the depth of the separation net placing area is 6.5 mm.

7. The membrane element flow channel spacer mesh detection device of claim 1, wherein: at least one gasket is arranged in the separation net placing area to adapt to separation nets with different thicknesses.

8. The membrane element flow channel spacer mesh detection device of claim 7, wherein: the thickness of the at least one gasket is 0.2-3 mm.

9. A membrane element flow passage separation net detection method is characterized in that: the membrane element flow channel barrier detection device as claimed in any one of claims 1 to 8 is used for detecting the dirt receiving performance, the diffusion performance and the energy saving performance of the membrane element flow channel barrier to be detected.

10. The method for detecting a membrane element flow passage screen of claim 9, wherein: when the dirt containing performance of the flow passage separation net of the membrane element is detected, the detection is characterized by testing the front and back turbidity difference of the detection liquid; when the diffusion performance of the membrane element flow passage separation net is detected, the diffusion performance is characterized by testing the diffusion degree of detection feed liquid dyed by a tracer; when the energy-saving performance of the membrane element flow channel separation net is detected, the representation is carried out by testing the over-flow difference of the separation net to the detection feed liquid.

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