Electrolysis water hydrogen PEM electrolytic cell flow field structure

Abstract

The utility model discloses a kind of electrolytic water hydrogen production PEM electrolytic cell flow field structure, belong to distributed hydrogen production especially electrolytic water hydrogen production technical field. Including located at the import and import of square flow field plate two sides, import is sequentially communicated import by the first flow guide area that surface is equipped with plating, flow equalization area, parallel flow field area, mixed flow area and second flow guide area;Flow equalization area includes several different lengths second bar flow guide strip, and several dot flow guide blocks, parallel flow field area includes several fourth bar flow guide strip of parallel distribution, mixed flow area includes several dot flow guide blocks;Fluid in flow field plate is radiated by the outer surface of second bar flow guide strip, dot flow guide block, fourth bar flow guide strip.The beneficial effects of the utility model are: guarantee the uniformity of fluid in flow field, can effectively radiate simultaneously, guarantee the stable operation of system, by the parallel connection of several flow field plates, meet the requirement of effective reaction area of electrolytic cell, guarantee the serviceability of flow field plate simultaneously.

Description

Technical Field

[0001] This utility model relates to a flow field structure of a PEM electrolyzer for hydrogen production by water electrolysis, belonging to the field of distributed hydrogen production, especially water electrolysis hydrogen production technology. Background Technology

[0002] PEM electrolyzers are developing towards higher power and hydrogen production capacities, correspondingly requiring larger effective reaction areas. The current uniformity of large-area PEM electrolyzers depends on the uniformity of the reactant and product fluids. The fluids within the electrolyzer involve a gas-liquid two-phase flow, and the uniformity of this two-phase flow distribution is highly dependent on the flow field, posing a greater challenge to the flow field design of the bipolar plates. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a flow field structure for a PEM electrolyzer for hydrogen production via water electrolysis. This structure expands the effective reaction area of ​​the electrolyzer while ensuring the uniformity of the fluid within the flow field, and also effectively dissipates heat, thus guaranteeing the stable operation of the system.

[0004] This utility model provides a flow field structure for a PEM electrolyzer for hydrogen production via water electrolysis, including an inlet and an outlet located on both sides of a square flow field plate. The inlet is connected to a first flow guiding zone, a flow equalization zone, a parallel flow field zone, a mixing flow zone, and a second flow guiding zone, all of which have coatings on their surfaces. The flow equalization zone includes several second strip-shaped flow guiding strips of different lengths and several point-shaped flow guiding blocks. The parallel flow field zone includes several parallel fourth strip-shaped flow guiding strips, and the mixing flow zone includes several point-shaped flow guiding blocks. The fluid in the flow field plate dissipates heat through the outer surfaces of the second strip-shaped flow guiding strips, point-shaped flow guiding blocks, and fourth strip-shaped flow guiding strips.

[0005] According to one embodiment of the present invention, both the first and second flow guiding areas include a plurality of first strip-shaped flow guiding strips, a support plate is provided on the first strip-shaped flow guiding strips, and a sealing gasket is provided on the support plate. The second flow guiding area includes a plurality of third strip-shaped flow guiding strips, and the fluid in the flow field plate is also cooled through the first and third strip-shaped flow guiding strips.

[0006] According to one embodiment of the present invention, the heat dissipation area per square meter of the flow field plate is not less than 1.5 m2.

[0007] According to one embodiment of the present invention, the contact area between the flow fields on both sides of the flow field plate and the membrane electrode is not less than 0.1 m2 per square meter of projected area.

[0008] According to one embodiment of the present invention, several flow field plates are arranged in a parallel manner to form an expanded flow field.

[0009] According to one embodiment of the present invention, the first flow guiding zone, the flow equalization zone, the parallel flow field zone, the mixed flow zone, and the second flow guiding zone are all processed by stamping, mechanical engraving, chemical etching, or electrochemical etching processes.

[0010] According to one embodiment of the present invention, the coating is applied by CVD, PVD, electroplating, or chemical plating.

[0011] According to one embodiment of the present invention, the coating is a precious metal platinum or an alloy of platinum.

[0012] According to one embodiment of the present invention, the flow field plate is made of titanium, stainless steel, or a graphite / titanium composite material.

[0013] According to one embodiment of the present invention, the contact resistance of the electrolytic cell flow field is not greater than 0.1 mΩ·cm.

[0014] The beneficial effects of this utility model are: ensuring the uniformity of the fluid in the flow field, effectively dissipating heat, ensuring the stable operation of the system, and meeting the requirements of the effective reaction area of ​​the electrolyzer by arranging several flow field plates in parallel, while ensuring the performance of the flow field plates in the distributed hydrogen production process. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the present invention.

[0016] The attached diagram is labeled as follows: 1. Flow field plate, 2. Inlet, 3. Outlet, 4. First guide zone, 5. Flow equalization zone, 6. Parallel flow field zone, 7. Mixed flow zone, 8. Second guide zone, 9. First strip guide bar, 10. Dot guide block, 11. Fourth strip guide bar, 12. Third strip guide bar. Detailed Implementation

[0017] The following is in conjunction with the appendix Figure 1 Further explanation of this utility model:

[0018] A flow field structure for a PEM electrolyzer for hydrogen production via water electrolysis includes an inlet 2 and an outlet 3 located on both sides of a square titanium flow field plate 1. The inlet 2 is connected to a flow equalization zone 5 via a first flow guiding zone 4. The flow equalization zone 5 is connected to a parallel flow field zone 6. The parallel flow field zone 6 is connected to a mixing zone 7. The mixing zone 7 is connected to a second flow guiding zone 8. The second flow guiding zone 8 is connected to the outlet 3. Both the first flow guiding zone 4 and the second flow guiding zone 8 include a plurality of first strip-shaped flow guiding strips 9. A support plate is provided on the first strip-shaped flow guiding strips 9, and a sealing gasket is provided on the support plate. The flow equalization zone 5 includes a plurality of second strip-shaped flow guiding strips of different lengths and a plurality of point-shaped flow guiding blocks 10. The parallel flow field zone 6 includes a plurality of parallel fourth strip-shaped flow guiding strips 11. The mixing zone 7 includes a plurality of point-shaped flow guiding blocks 10. The second flow guiding zone 8 includes a plurality of third strip-shaped flow guiding strips 12. The fluid enters from inlet 2, passes through the first guide zone 4 and enters the flow equalization zone 5. Under the flow equalization effect of the flow equalization zone, the fluid enters the parallel flow field zone 6 evenly. The fluid flows from the parallel flow field zone 6 to the second guide zone 8 and then flows out from outlet 3.

[0019] The fluid in the flow field plate 1 dissipates heat through the outer surfaces of the first strip-shaped guide bar 9, the second strip-shaped guide bar, the fourth strip-shaped guide bar 11, the dot-shaped guide block 10, and the third strip-shaped guide bar 12. The heat dissipation area per square meter of the projected area of ​​the flow field plate 1 is not less than 1.5m². 2 The contact area between the flow field on both sides of the flow field plate and the membrane electrode is not less than 0.1 m² per square meter of projected area. 2 This ensures smooth heat conduction, guarantees effective heat dissipation, and ensures stable system operation.

[0020] Several flow field plates 1 are connected in parallel to form an expanded flow field. This satisfies the effective reaction area requirements of the electrolyzer while ensuring the performance of the flow field plates.

[0021] The first flow guiding zone 4, the flow equalization zone 5, the parallel flow field zone 6, the mixed flow zone 7, and the second flow guiding zone 8 are all processed by stamping, mechanical engraving, chemical etching, or electrochemical etching processes.

[0022] The surfaces of the first flow guiding zone 4, the flow equalization zone 5, the parallel flow field zone 6, the flow mixing zone 7, and the second flow guiding zone 8 are all coated with a coating, which is applied by CVD, PVD, electroplating, or chemical plating.

[0023] The coating is made of the precious metal platinum. The contact resistance of the platinum coating in the electrolytic cell flow field is no greater than 0.1 mΩ·cm.

[0024] 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 flow field structure for a PEM electrolyzer for hydrogen production via water electrolysis, characterized in that, The flow field plate (1) includes an inlet (2) and an outlet (3) located on both sides. The inlet (2) is connected to the outlet (3) through a first guide zone (4), a flow equalization zone (5), a parallel flow field zone (6), a mixing zone (7), and a second guide zone (8), all of which have coatings on their surfaces. The flow equalization zone (5) includes several second strip guides of different lengths and several point guide blocks (10). The parallel flow field zone (6) includes several parallel fourth strip guides (11). The mixing zone (7) includes several point guide blocks (10). The fluid in the flow field plate (1) is cooled by the outer surfaces of the second strip guides, point guide blocks (10), and fourth strip guides (11).

2. The flow field structure of the PEM electrolyzer for hydrogen production via water electrolysis according to claim 1, characterized in that, The first guide zone (4) and the second guide zone (8) each include a number of first strip guide strips (9), a support plate is provided on the first strip guide strip (9), and a sealing gasket is provided on the support plate. The second guide zone (8) includes a number of third strip guide strips (12). The fluid in the flow field plate (1) is also cooled by the first strip guide strip (9) and the third strip guide strip (12).

3. The flow field structure of the PEM electrolyzer for hydrogen production via water electrolysis according to claim 2, characterized in that, The heat dissipation area of ​​the flow field plate (1) per square meter of projected area is not less than 1.5m². 2 .

4. The flow field structure of the PEM electrolyzer for hydrogen production via water electrolysis according to claim 3, characterized in that, Between the flow field on both sides of the flow field plate (1) and the membrane electrode, the contact area per square meter of projected area is not less than 0.1 m². 2 .

5. The flow field structure of the PEM electrolyzer for hydrogen production via water electrolysis according to claim 1, characterized in that, Several flow field plates (1) are arranged in a parallel manner to form an expanded flow field.

6. The flow field structure of the PEM electrolyzer for hydrogen production via water electrolysis according to claim 1, characterized in that, The first flow guiding zone (4), the flow equalization zone (5), the parallel flow field zone (6), the mixed flow zone (7), and the second flow guiding zone (8) are all processed by stamping, mechanical engraving, chemical etching, or electrochemical etching processes.

7. The flow field structure of the PEM electrolyzer for hydrogen production via water electrolysis according to claim 1, characterized in that, The coating is applied using CVD, PVD, electroplating, or chemical plating.

8. The flow field structure of the PEM electrolyzer for hydrogen production via water electrolysis according to claim 7, characterized in that, The coating is made of the precious metal platinum or an alloy of platinum.

9. The flow field structure of the PEM electrolyzer for hydrogen production via water electrolysis according to claim 1, characterized in that, The flow field plate (1) is made of titanium, stainless steel, or a composite material of graphite and titanium.

10. The flow field structure of the PEM electrolyzer for hydrogen production via water electrolysis according to claim 9, characterized in that, The contact resistance of the electrolytic cell flow field is no greater than 0.1 mΩ·cm.

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