A coagulation tank with a flow guide structure

Abstract

This utility model discloses a coagulation tank with a flow guiding structure, relating to the field of composite diaphragm production equipment. By setting inlet and outlet at the bottom of the tank, and cooperating with inlet guide plates, outlet guide plates, and diaphragm flow field protection guide plates, the horizontal flow field is transformed into a vertical flow field, reducing the impact on the composite diaphragm and solving the problems of uneven diaphragm thickness and unstable surface resistivity in the prior art. This utility model has a simple structure, can significantly improve the preparation quality of composite diaphragms, and is suitable for the industrial production of composite diaphragms for alkaline electrolytic cells.

Description

Technical Field

[0001] This utility model relates to the field of composite membrane production equipment, specifically to a coagulation tank with a flow guiding structure for the preparation of composite membranes for alkaline electrolysis cells. Background Technology

[0002] Currently, alkaline composite membranes are mainly prepared using phase separation methods. This process requires phase separation in a coagulation tank, where a non-solvent phase needs to be added simultaneously with the precipitation of the solvent phase. Traditional coagulation tanks typically employ a square tank design, including a tank body, a liquid level control system, and inlets and outlets. The non-solvent phase in the coagulation bath flows primarily horizontally. However, during the preparation of composite membranes, the membrane material has relatively weak mechanical strength in the early stages of phase transition. The impact of the horizontal flow field leads to uneven membrane thickness and surface roughness, with thickness differences reaching 50–100 micrometers and sheet resistivity differences reaching 0.07 Ω·cm² in severe cases. This defect not only affects the electrochemical performance of the membrane but also restricts the industrial production efficiency and cost control of alkaline electrolyzers.

[0003] In existing technologies, some solutions attempt to improve the flow field by adjusting the inlet and outlet positions or adding baffles. However, since the dominant direction of the horizontal flow field is not fundamentally changed, it is difficult to effectively solve the problems of unstable membrane thickness and surface resistivity. Therefore, there is an urgent need to develop a solidification tank structure that can convert the horizontal flow field into a vertical or inclined flow field to reduce the impact of the flow field on the membrane and improve the membrane preparation quality. Utility Model Content

[0004] In view of the above-mentioned defects in the prior art, the present invention aims to solve the technical problems of uneven composite membrane thickness and unstable surface resistance caused by the horizontal flow field of the coagulation bath in the prior art, and provides a coagulation tank that optimizes the flow field distribution through a flow guiding structure, so as to achieve precise control of the flow field impact during the membrane preparation process.

[0005] To achieve the above objectives, this utility model provides a coagulation tank with a flow guiding structure, including a tank body and a flow guiding structure; the flow guiding structure is disposed in the tank body to convert the horizontal flow field of the coagulation bath into a vertical or inclined flow field, so as to reduce the impact of the horizontal flow field on the composite diaphragm and improve the thickness uniformity of the composite diaphragm.

[0006] Preferably, the flow guiding structure includes an inlet guide plate, a front guide plate, a rear guide plate, and an outlet guide plate; the bottom of the tank is provided with an inlet and an outlet on both sides, the inlet guide plate is located at the inlet, the outlet guide plate is located at the outlet, and the front guide plate and the rear guide plate are located on the front and rear sides of the composite diaphragm, respectively.

[0007] Preferably, the inlet guide plate, the front guide plate, the rear guide plate, and the outlet guide plate are perforated or non-perforated plates; wherein, the upper and lower ends of the front guide plate and the rear guide plate are provided with perforated flow field distribution plates, the shape of the holes is circular or other shapes, the diameter of the holes is 1mm to 10mm, and the opening area is 5% to 90%.

[0008] Preferably, the inlet guide plate, front guide plate, rear guide plate and outlet guide plate are flat plates or curved plates with a rectangular or other uniform cross-sectional shape; the upper part of the inlet guide plate has an opening to make the inlet fluid flow in a vertical direction, and the upper side of the outlet guide plate has an opening but no opening on the side, and its height is slightly higher than that of the guide roller.

[0009] Preferably, the height of the front guide plate is higher than the solidification bath liquid level, the upper part has no holes or has raised triangular holes, the bottom has round holes and the hole position is not higher than the guide roller; the rear guide plate is located above the guide roller, the whole has no holes, and has rectangular or triangular guide channels in the vertical direction.

[0010] Preferably, it also includes a stirring device located at the bottom of the tank body to assist in uniformizing the concentration field and flow field of the coagulation bath, and to further reduce the influence of the horizontal flow field in conjunction with the flow guiding structure.

[0011] Beneficial technical effects:

[0012] This invention transforms the horizontal flow field into a vertical or inclined flow field through a flow-guiding structure, allowing the coagulation bath fluid to act on the composite diaphragm more uniformly and significantly reducing flow field impact. Tests show that the thickness difference of the composite diaphragm prepared using this coagulation tank can be controlled within 5 micrometers, and the surface resistivity difference is less than 0.01 Ω·cm², representing an improvement of over 80% compared to traditional coagulation tanks. Simultaneously, the addition of a stirring device further optimizes the concentration uniformity of the coagulation bath, ensuring stable phase separation of the diaphragm and making it suitable for large-scale industrial production.

[0013] The following will further explain the concept, specific structure and technical effects of this utility model in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of this utility model. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the solidification tank of this utility model;

[0015] Figure 2 This is a schematic diagram of the cross-section of the flow guiding structure (rectangular cross-section);

[0016] Figure 3 This is a schematic diagram of the cross-section of the flow guiding structure (square sawtooth cross-section).

[0017] Figure 4This is a schematic diagram of the cross-section of the flow guiding structure (triangular sawtooth cross-section).

[0018] Figure 5 This is a side view of the flow guiding structure (circular hole);

[0019] Figure 6 This is a side view of the flow guiding structure (triangular hole).

[0020] The components are: 1. Coating unit; 2. Composite diaphragm; 3. Coagulation bath; 4. Guide roller; 5. Traction roller; 6. Inlet; 7. Inlet guide plate; 8. Front guide plate; 9. Rear guide plate; 10. Outlet guide plate; 11. Outlet; 12. Tank. Detailed Implementation

[0021] The following description, with reference to the accompanying drawings, illustrates several preferred embodiments of the present invention to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0022] In the accompanying drawings, components with the same structure are indicated by the same numerical designation, and components with similar structures or functions are indicated by similar numerical designations. The dimensions and thicknesses of each component shown in the drawings are arbitrary, and this invention does not limit the dimensions and thicknesses of each component. To make the illustrations clearer, the thickness of some components has been appropriately exaggerated in the drawings.

[0023] like Figure 1 As shown, this utility model provides a coagulation tank with a flow guiding structure, including a tank body 12 and a flow guiding structure; the flow guiding structure is disposed in the tank body 12 and is used to convert the horizontal flow field of the coagulation bath 3 into a vertical or inclined flow field, so as to reduce the impact of the horizontal flow field on the composite diaphragm 2 and improve the thickness uniformity of the composite diaphragm 2.

[0024] like Figure 1 As shown, the flow guiding structure includes an inlet guide plate 7, a front guide plate 8, a rear guide plate 9, and an outlet guide plate 10; the bottom of the tank 12 is provided with an inlet 6 and an outlet 11 on both sides, the inlet guide plate 7 is located at the inlet 6, the outlet guide plate 10 is located at the outlet 11, and the front guide plate 8 and the rear guide plate 9 are located on the front and rear sides of the composite diaphragm 2, respectively.

[0025] The inlet guide plate 7, the front guide plate 8, the rear guide plate 9, and the outlet guide plate 10 are perforated or non-perforated plates; wherein, the upper and lower ends of the front guide plate 8 and the rear guide plate 9 are provided with perforated flow field distribution plates, the shape of the holes is circular or other shapes, the diameter of the holes is 1mm~10mm, and the opening area is 5%~90%.

[0026] The inlet guide plate 7, the front guide plate 8, the rear guide plate 9, and the outlet guide plate 10 are flat or curved plates with rectangular or other uniform cross-sectional shapes. See details. Figures 2-4 The inlet guide plate 7 has an opening at the top to direct the inlet fluid to flow vertically. The outlet guide plate 10 has an opening on the top but no opening on the sides, and its height is slightly higher than that of the guide roller 4. See details. Figure 1 .

[0027] like Figure 1 As shown, the height of the front guide plate 8 is higher than the liquid level of the coagulation bath 3, the upper part has no holes or has raised triangular holes, the bottom has round holes and the hole position is not higher than the guide roller 4; the rear guide plate 9 is located above the guide roller 4, the whole has no holes, and has rectangular or triangular guide channels in the vertical direction.

[0028] This utility model also includes a stirring device, which is located at the bottom inside the tank 12 to assist in uniformizing the concentration field and flow field of the coagulation bath 3, and further reduce the influence of the horizontal flow field in conjunction with the flow guiding structure.

[0029] This invention transforms the horizontal flow field into a vertical or inclined flow field through a flow-guiding structure, allowing the fluid in the coagulation bath 3 to act on the composite diaphragm 2 more uniformly, significantly reducing flow field impact. Tests show that the thickness difference of the composite diaphragm 2 prepared using this coagulation tank can be controlled within 5 micrometers, and the surface resistivity difference is less than 0.01 Ω·cm², an improvement of over 80% compared to traditional coagulation tanks. Simultaneously, the addition of a stirring device further optimizes the concentration uniformity of the coagulation bath 3, ensuring stable phase separation of the diaphragm and making it suitable for large-scale industrial production.

[0030] Example 1: Solidification tank with perforated guide plate

[0031] The coagulation bath inlet is located at the front and lower part of the tank. An inlet guide plate with 2cm diameter, evenly distributed, has a circular hole at its top to direct the fluid flow vertically. The front guide plate, positioned in front of the composite diaphragm, has a 2cm diameter circular hole at its bottom, no higher than the guide roller. The front guide plate has no holes at its top to reduce the impact of horizontal water flow on the diaphragm and should be 2cm higher than the coagulation bath level. A rectangular flow channel is provided vertically. The rear guide plate, located behind the composite diaphragm and above the guide roller, has no holes and a rectangular flow channel vertically. Its height can be slightly lower than the coagulation bath level (2cm). An outlet guide plate with a circular hole at its top and no holes on the sides is provided, and its height is slightly higher than the guide roller (3cm). A paddle agitator is installed at the bottom of the tank, with a rotation speed controlled at 100-150 r / min.

[0032] In the preparation of the composite diaphragm, the support layer is coated with a slurry of a certain thickness on both sides in a coating unit, then enters a coagulation bath. After coagulation and molding, it is washed, its thickness is measured, and then it is wound up. A sample is taken to test the surface resistivity.

[0033] Test results: The difference in membrane thickness was 4.2 micrometers, and the difference in sheet resistance was 0.008 Ω·cm².

[0034] Example 2: Solidification tank with triangular perforated guide plate

[0035] The coagulation bath inlet is located at the front and lower part of the tank. An inlet guide plate is installed at the inlet, with raised triangular holes at the top to direct the flow of inlet fluid vertically. The holes are 2cm in diameter and evenly distributed. The front guide plate is located in front of the composite diaphragm, with round holes at the bottom. The holes are not higher than the guide rollers, and are 2cm in diameter and evenly distributed. The raised triangular holes at the top of the front guide plate reduce the impact of horizontal water flow on the diaphragm, and its height should be higher than the coagulation bath level. A triangular guide channel is provided vertically. The rear guide plate is located behind the composite diaphragm and above the guide rollers. It is not perforated and has a rectangular guide channel vertically. Its height can be slightly lower than the coagulation bath level. An outlet guide plate is installed at the outlet, with a round hole on the top and no holes on the sides. Its height is slightly higher than the guide rollers.

[0036] The support layer was introduced into the coagulation bath at a 15° angle, and the remaining process tests were the same as in Example 1.

[0037] Test results: The membrane thickness difference was 3.8 micrometers and the sheet resistance difference was 0.007 Ω·cm², which is a further optimization compared to Example 1.

[0038] Example 3: Solidification tank with simplified guide plate structure

[0039] The coagulation bath inlet is located at the front and lower part of the tank. There is no guide plate at the inlet. The front guide plate is located in front of the composite diaphragm, with a round hole at the bottom. The hole is no higher than the guide roller, and the diameter of the hole is 2cm, evenly distributed. The upper part of the front guide plate has raised triangular holes to reduce the impact of horizontal water flow on the diaphragm, and its height should be higher than the coagulation bath level. A triangular guide channel is provided vertically. The rear guide plate is located behind the composite diaphragm, above the guide roller. It has no holes and a rectangular guide channel vertically. Its height can be slightly lower than the coagulation bath level. There is no guide plate at the outlet.

[0040] The process testing was the same as in Example 1.

[0041] Test structure: The membrane thickness difference is 6.5 micrometers and the surface resistivity difference is 0.012 Ω·cm², indicating that the inlet and outlet guide vanes play an auxiliary role in flow field optimization.

[0042] Comparative Example: Traditional Solidification Tank

[0043] It adopts a conventional square tank, with the inlet and outlet located at the front and rear of the tank respectively, and has no guide plate or stirring device.

[0044] The process testing was the same as in Example 1.

[0045] Test results: The difference in membrane thickness was 60 micrometers and the difference in surface resistivity was 0.065 Ω·cm², which verified the significant advantages of the flow guiding structure of this utility model.

[0046] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A solidification tank with a flow guiding structure, characterized in that, It includes a tank and a flow guiding structure; the flow guiding structure is set in the tank and is used to convert the horizontal flow field of the coagulation bath into a vertical or inclined flow field, so as to reduce the impact of the horizontal flow field on the composite membrane and improve the thickness uniformity of the composite membrane. The flow guiding structure includes an inlet guide plate, a front guide plate, a rear guide plate, and an outlet guide plate; the bottom of the tank is provided with an inlet and an outlet on both sides, the inlet guide plate is located at the inlet, the outlet guide plate is located at the outlet, and the front guide plate and the rear guide plate are located on the front and rear sides of the composite diaphragm, respectively.

2. The solidification tank with a flow guiding structure according to claim 1, characterized in that, The inlet guide plate, front guide plate, rear guide plate and outlet guide plate are perforated plates or non-perforated plates; wherein, the upper and lower ends of the front guide plate and the rear guide plate are provided with perforated flow field distribution plates, the shape of the holes is circular, the diameter of the holes is 1mm~10mm, and the opening area is 5%~90%.

3. The solidification tank with a flow guiding structure according to claim 1, characterized in that, The inlet guide plate, front guide plate, rear guide plate and outlet guide plate are flat plates or curved plates with rectangular or uniform cross-sectional shapes; the upper part of the inlet guide plate has an opening to make the inlet fluid flow in a vertical direction, the upper side of the outlet guide plate has an opening but no opening on the side, and its height is higher than the guide roller.

4. The solidification tank with a flow guiding structure according to claim 1, characterized in that, The height of the front guide plate is higher than the solidification bath liquid level. The upper part has no holes or has raised triangular holes, and the bottom has round holes and the hole position is not higher than the guide roller. The rear guide plate is located above the guide roller, has no holes, and has rectangular or triangular guide channels in the vertical direction.

5. The solidification tank with a flow guiding structure according to any one of claims 1 to 4, characterized in that, It also includes a stirring device located at the bottom of the tank body, which is used to assist in uniformizing the concentration field and flow field of the coagulation bath, and further reduce the influence of the horizontal flow field in conjunction with the flow guiding structure.

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