Tubular microfiltration membrane and reaction tank

Abstract

The utility model provides a tubular microfiltration membrane and a reaction tank. According to the micro-filtration membrane, the spiral guide sheets are arranged in the membrane tube main body to guide the tubular bundling separation membrane to spirally extend, so that a rotational flow effect is formed to break through a traditional straight-through flow channel mode, the turbulence degree of fluid is enhanced, and concentration polarization is reduced. The split type design is adopted in the structure, an upper shell and a lower shell are welded and formed, end covers at the two ends are assembled with connecting grooves through clamping blocks, a rubber plate with holes fixes a film bundle through holes, clamping grooves in the edges of the rubber plate are embedded into grooves of guide pieces to prevent flow channel bias flow, and an additionally-arranged axial flow disturbing rod and a spiral flow channel cooperate to generate multi-stage eddy currents to strengthen boundary layer disturbance. The composite supporting structure is composed of a stainless steel wire net and a gradient pore ceramic frame, the outer net improves the mechanical strength, the inner layer ceramic frame adopts 35-60% radial gradient pore distribution to achieve progressive throttling, the transmembrane pressure difference is optimized, and membrane wires are protected.

Description

Technical Field

[0001] This utility model relates to the field of membrane separation device technology, specifically to a tubular microfiltration membrane and a reaction tank. Background Technology

[0002] Tubular microfiltration membranes are high-efficiency filtration devices based on membrane technology. Their main working principle involves forming micropores in the membrane tube wall, then using a pressure difference to force liquid through the membrane tube, thereby filtering out suspended solids, bacteria, and other microorganisms. Typically, the micropore size is between 0.1 and 10 μm. In the specific operation, the liquid to be filtered passes through the tubular microfiltration membrane, and the pressure difference isolates suspended solids, bacteria, and other microorganisms on one side of the membrane, while the purified liquid enters the tube through the membrane pores.

[0003] However, traditional tubular filter membranes use a straight flow channel, which can easily lead to concentration polarization, thereby reducing filtration efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a tubular microfiltration membrane that overcomes the adverse effects of concentration polarization caused by the straight-through flow channel in the prior art, which leads to lower filtration efficiency.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A tubular microfiltration membrane includes a membrane tube body with an inlet and a drain outlet arranged radially and vertically opposite each other. A tubular bundled separation membrane is disposed inside the membrane tube body, and a spiral guide plate is disposed inside the membrane tube body. The separation membrane extends spirally inside the membrane tube body along the spiral guide plate.

[0007] Furthermore, a first connecting end cap and a second connecting end cap are respectively provided at both ends of the membrane tube body. Both the first connecting end cap and the second connecting end cap are provided with a locking block, and the membrane tube body is provided with a connecting groove that adapts to the locking block.

[0008] Furthermore, a perforated plate is provided between the bundled separation membrane and the membrane tube body, and the bundled separation membrane passes through the holes of the perforated plate.

[0009] Furthermore, the perforated plate has a slot on its edge, and the spiral guide plate has multiple grooves evenly distributed on it, with the slot engaging with the groove.

[0010] Furthermore, the perforated plate is a rubber perforated plate, and the thickness of the rubber perforated plate is 0.5-2cm.

[0011] Furthermore, the perforated plate is provided with a turbulence bar extending axially along the main body of the membrane tube.

[0012] Furthermore, a composite support structure is provided between the membrane tube body and at least one bundle of separation membranes, wherein the composite support structure consists of a stainless steel wire mesh and a ceramic frame from the outside to the inside.

[0013] Furthermore, the porosity of the ceramic frame exhibits a gradient distribution of 35-60% from the inside to the outside along the radial direction of the bundle of separation membranes it covers.

[0014] Furthermore, the membrane tube body includes an upper shell and a lower shell, which are integrally connected by welding.

[0015] This utility model further provides a reaction tank for a tubular microfiltration membrane, which includes a tubular microfiltration membrane having at least one of the above-mentioned technical features, and a tubular microfiltration membrane array is formed by connecting multiple inlets and outlets in sequence.

[0016] The advantages and beneficial effects of this utility model are as follows:

[0017] 1. The spiral guide vanes inside the membrane tube guide the separation membrane to extend spirally, breaking the traditional straight-through flow channel pattern and creating a swirling effect. This significantly reduces concentration polarization, enhances fluid turbulence, and improves filtration efficiency.

[0018] 2. The end caps at both ends are connected to the membrane tube body using a slot structure. The membrane tube body is welded to the upper and lower shells. The two end caps can be welded or glued to the membrane tube body, which facilitates easier processing and manufacturing.

[0019] 3. The perforated rubber plate secures the separation membrane bundle through its holes, and its edge grooves engage with the grooves of the spiral guide plate to suppress membrane vibration and displacement, preventing flow channel deviation. The perforated plate is equipped with turbulence bars, which, together with the spiral flow channel, form multi-stage vortices, enhancing boundary layer disturbance and reducing the decrease in membrane flux caused by concentration polarization.

[0020] 4. The separation membrane is equipped with stainless steel wire mesh and a ceramic core with gradient gaps from the outside to the inside, which respectively provide mechanical shock resistance and progressive throttling, while protecting the membrane fibers and optimizing the transmembrane pressure distribution. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the perforated plate of this utility model;

[0024] Figure 4 This is a cross-sectional structural schematic diagram of the separation membrane of this utility model;

[0025] In the picture:

[0026] 1-Membrane tube body, 11-Inlet, 12-Drain outlet, 13-Connecting groove, 14-Upper shell, 15-Lower shell, 2-Separation membrane, 3-Spiral guide plate, 31-Groove, 4-First connecting end cap, 5-Second connecting end cap, 41-Card block, 6-Perforated plate, 61-Orifice, 62-Card groove, 63-Break bar, 7-Composite support structure, 71-Stainless steel wire mesh, 72-Ceramic frame. Detailed Implementation

[0027] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0028] like Figures 1 to 4 As shown, the tubular microfiltration membrane of this embodiment includes a membrane tube body 1, a separation membrane 2, a spiral guide plate 3, a first connecting end cap 4, a second connecting end cap 5, a perforated plate 6, and a composite support structure 7. The membrane tube body 1 is composed of a split upper shell 14 and a lower shell 15, which are welded together to ensure structural sealing. The upper and lower radial sides of the membrane tube body 1 are respectively provided with an inlet 11 and a drain 12 for the input of wastewater fluid and the discharge of waste material.

[0029] A spiral guide plate 3 is installed axially inside the membrane tube body 1. The spiral angle is 15°-45°, which is used to guide the separation membrane 2 to extend in a spiral shape to form a swirling channel.

[0030] The separation membrane 2 consists of multiple tubular membrane filaments bundled together and passing through the perforations 61 of the perforated plate 6. The perforated plate 6 is made of rubber with a thickness of 0.5-2 cm and has grooves 62 on its edges that fit into the grooves 31 on the surface of the spiral guide plate 3 to prevent membrane filament vibration or flow channel deviation. Turbulence bars 63, with a diameter of 3-8 mm, are provided along the axial direction of the perforated plate 6 and extend from the membrane tube body 1. These turbulence bars, working together with the spiral guide plate 3, create multi-stage eddies in the fluid, enhancing boundary layer disturbance.

[0031] The first connecting end cap 4 and the second connecting end cap 5 are assembled with the connecting groove 13 of the membrane tube body 1 via a locking block 41. The locking block 41 and the connecting groove 13 are fixed by interference fit or adhesive bonding to ensure the sealing of the end caps.

[0032] The composite support structure 7 comprises, from the outside in, a stainless steel wire mesh 71 and a gradient-pore ceramic frame 72. The stainless steel wire mesh 71 has a mesh density of 20-40 mesh, used to improve overall mechanical strength. The porosity of the ceramic frame 72 is distributed radially from the inside to the outside of the separation membrane 2 in a gradient distribution of 35%-60%, for example, 60% porosity in the inner layer and 35% in the outer layer, achieving gradual throttling, optimizing transmembrane pressure distribution, and protecting the membrane fibers.

[0033] This embodiment also provides a tubular microfiltration membrane reactor, which consists of an array of multiple tubular microfiltration membranes as described in Embodiment 1, connected in series or in parallel through an inlet 11 and a drain 12. The specific implementation steps are as follows:

[0034] 1. Connect the inlet 11 of a single tubular microfiltration membrane to the upstream pump via a pipe, and connect the outlet 12 to the downstream waste liquid collection system.

[0035] 2. Multiple membrane tube bodies 1 are quickly assembled with the end cap's locking block 41 and connecting groove 13 to form a modular array, improving processing capacity.

[0036] 3. During operation, the liquid to be filtered enters the membrane tube body 1 from the inlet 11 and forms a swirling flow under the guidance of the spiral guide plate 3. The degree of fluid turbulence is significantly enhanced, and the concentration polarization phenomenon is suppressed.

[0037] 4. The purified liquid permeates into the water collection chamber through the micropores of the separation membrane 2, while the trapped pollutants are discharged from the drain outlet 12.

[0038] This invention's tubular microfiltration membrane significantly improves filtration efficiency and suppresses concentration polarization by optimizing the flow channel structure and support design. Its core working principle is that after the filtered liquid enters through the inlet 11 of the membrane tube body 1, it forms a swirling flow along the spiral flow channel (pitch 15°-45°) under the guidance of the spiral guide plate 3. The swirling effect breaks the laminar flow state of the traditional straight-through flow channel, increasing the tangential velocity of the fluid and enhancing the degree of turbulence. During this process, the centrifugal force of the fluid migrates suspended matter towards the membrane tube wall, reducing the deposition of pollutants on the membrane surface. The axial turbulence-inducing rods 63 set on the perforated plate 6 work synergistically with the spiral flow channel to generate multi-stage eddies in the fluid. The eddies continuously disturb the boundary layer on the membrane surface, disrupting the formation of the concentration polarization layer, reducing transmembrane resistance, and thus increasing the flux of the separation membrane 2. After the fluid completes turbulence enhancement within the spiral flow channel, the pure liquid permeates through the micropores (0.1-10 μm) of the separation membrane 2 and is finally discharged from the outlet.

[0039] The trapped pollutants (such as suspended solids and microorganisms) migrate to the bottom of the membrane tube due to the swirling flow and are periodically discharged through the drain outlet 12.

[0040] Tests showed that this tubular microfiltration membrane has a filtration efficiency that is about 30% higher than that of the traditional straight-through flow channel, a 25% improvement in the uniformity of transmembrane pressure distribution, and a 20% extension in membrane fiber life. The synergistic effect of the spiral flow channel and the turbulence bar effectively reduces boundary layer resistance and minimizes the decrease in membrane flux caused by concentration polarization.

[0041] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A tubular microfiltration membrane, comprising a membrane tube body (1), characterized in that: The membrane tube body (1) is provided with an inlet (11) and a drain (12) arranged radially and vertically. The membrane tube body (1) is provided with a tubular bundled separation membrane (2). The membrane tube body (1) is provided with a spiral guide plate (3). The separation membrane (2) extends spirally inside the membrane tube body along the spiral guide plate (3).

2. The tubular microfiltration membrane according to claim 1, characterized in that: The membrane tube body (1) is provided with a first connecting end cap (4) and a second connecting end cap (5) at both ends. Both the first connecting end cap (4) and the second connecting end cap (5) are provided with a locking block (41). The membrane tube body (1) is provided with a connecting groove (13) adapted to the locking block (41).

3. The tubular microfiltration membrane according to claim 1, characterized in that: A perforated plate (6) is provided between the bundled separation membrane (2) and the membrane tube body (1), and the separation membrane (2) passes through the holes (61) of the perforated plate (6).

4. The tubular microfiltration membrane according to claim 3, characterized in that: The perforated plate (6) has a slot (62) on its edge, and the spiral guide plate (3) has multiple grooves (31) evenly distributed on its surface. The slot (62) engages with the groove (31).

5. The tubular microfiltration membrane according to claim 3, characterized in that: The perforated plate is provided with a turbulence bar (63) extending axially along the membrane tube body (1).

6. The tubular microfiltration membrane according to claim 3, characterized in that: The perforated plate (6) is made of rubber and has a thickness of 0.5-2cm.

7. The tubular microfiltration membrane according to claim 1, characterized in that: A composite support structure (7) is provided between the membrane tube body (1) and the separation membrane (2). The composite support structure (7) includes a stainless steel wire mesh (71) and a ceramic frame (72) from the outside to the inside.

8. The tubular microfiltration membrane according to claim 7, characterized in that: The porosity of the ceramic frame (72) is distributed in a gradient of 35-60% from the inside to the outside along the radial direction of the separation membrane (2) it covers.

9. The tubular microfiltration membrane according to claim 1, characterized in that: The membrane tube body (1) includes an upper shell (14) and a lower shell (15), which are connected together by welding.

10. A tubular microfiltration membrane reactor, characterized in that, It includes a tubular microfiltration membrane array formed by sequentially connecting the tubular microfiltration membranes described in any one of claims 1-9 through an inlet and a outlet.

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