Square electrolytic bath flow field runner structure

Abstract

The utility model discloses a flow field runner structure of a square electrolytic bath. The flow field runner structure comprises a square bath body, a left end pressing plate, a right end pressing plate, a hydrogen side sealing gasket, a polar plate, an oxygen side sealing gasket and a multi-stage runner system, the left end pressing plate is provided with a hydrogen side alkali liquor inlet, an oxygen side alkali liquor inlet, a hydrogen and alkali liquor outlet, an oxygen and alkali liquor outlet and a drainage long circular groove, and the right end pressing plate is provided with an oxygen side alkali liquor long circular groove; the hydrogen side sealing gasket and the oxygen side sealing gasket are communicated with the corresponding holes of the polar plate through the axial holes to form hydrogen side alkali liquor first to third channels, oxygen side alkali liquor first to third channels, hydrogen and alkali liquor first to fifth channels and oxygen and alkali liquor first to fourth channels. The hydrogen side alkali liquor and the oxygen side alkali liquor are physically isolated through independent circulation flow channels, the uniformity of a flow field is ensured through the multi-stage parallel and reverse flow design, the gas purity, the alkali liquor circulation efficiency and the mass transfer performance are effectively improved by combining the 1.6 MPa high-pressure working condition, and meanwhile energy consumption and the local overheating risk are reduced.

Description

A flow field channel structure for a square electrolytic cell Technical Field

[0001] This utility model relates to the field of water electrolysis for hydrogen production technology, specifically a flow field structure for a square electrolyzer. Background Technology

[0002] Alkaline electrolyzers, as the core equipment for green hydrogen production, suffer from problems such as high energy consumption, low gas purity, and poor flow field uniformity. In existing technologies, the mixed circulation of alkaline solutions on the hydrogen and oxygen sides easily leads to cross-contamination of gases, and low-pressure electrolyzers are large in size and inefficient. Therefore, there is an urgent need for an electrolyzer structure that can achieve independent circulation on the hydrogen and oxygen sides, improve gas purity, and enhance flow field uniformity. Summary of the Invention

[0003] The purpose of this invention is to provide a flow field structure for a square electrolytic cell, which solves the problems of low gas purity and poor circulation efficiency in the prior art through independent circulation channels for hydrogen and oxygen-side alkaline solutions and a multi-stage flow channel design.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a flow channel structure for a square electrolytic cell, comprising a square cell body, wherein a left end pressure plate and a right end pressure plate are fixedly installed at both ends of the square cell body; a hydrogen-side sealing gasket, an electrode plate, and an oxygen-side sealing gasket are sequentially arranged between the left end pressure plate and the right end pressure plate, wherein the electrode plate is located between the hydrogen-side sealing gasket and the oxygen-side sealing gasket, the hydrogen-side sealing gasket is adjacent to the left end pressure plate, and the oxygen-side sealing gasket is adjacent to the right end pressure plate;

[0005] The left end pressure plate is provided with an axial hydrogen-side alkaline solution inlet, an axial oxygen-side alkaline solution inlet, an axial hydrogen and alkaline solution outlet, and an axial oxygen and alkaline solution outlet. The inner side of the left end pressure plate is also provided with a hydrogen-side alkaline solution elongated circumferential groove, a hydrogen and alkaline solution elongated circumferential groove, and an oxygen and alkaline solution elongated circumferential groove. The inner side of the right end pressure plate is provided with an oxygen-side alkaline solution elongated circumferential groove.

[0006] The hydrogen-side sealing gasket is provided with a radial hydrogen-side alkali inflow channel and a radial hydrogen and alkali outflow channel, and the oxygen-side sealing gasket is provided with a radial oxygen-side alkali inflow channel and a radial oxygen and alkali outflow channel; the hydrogen-side sealing gasket, the electrode plate, and the oxygen-side sealing gasket are all provided with through holes for the electrode plate alkali, the oxygen-side sealing gasket alkali, the hydrogen-side sealing gasket alkali, the electrode plate hydrogen and alkali, the oxygen-side sealing gasket hydrogen and alkali, the hydrogen-side sealing gasket hydrogen and alkali, the electrode plate oxygen and alkali, the oxygen-side sealing gasket oxygen and alkali, and the hydrogen-side sealing gasket oxygen and alkali.

[0007] The axial hydrogen-side alkaline inlet is connected to the alkaline hole of the hydrogen-side sealing gasket via a hydrogen-side alkaline elongated groove, forming a first, second, and third hydrogen-side alkaline channel; the axial oxygen-side alkaline inlet is connected to the alkaline hole of the oxygen-side sealing gasket via an oxygen-side alkaline elongated groove, forming a first, second, and third oxygen-side alkaline channel; the axial hydrogen and alkaline outlet is connected to the hydrogen and alkaline hole of the hydrogen-side sealing gasket via a hydrogen and alkaline elongated groove, forming a first to a fifth hydrogen and alkaline channel; the axial oxygen and alkaline outlet is connected to the oxygen and alkaline hole of the oxygen-side sealing gasket via an oxygen and alkaline elongated groove, forming a first to a fourth oxygen and alkaline channel.

[0008] Preferably, the hydrogen-side alkaline solution first channel, hydrogen-side alkaline solution second channel, hydrogen-side alkaline solution third channel and oxygen-side alkaline solution third channel are arranged in parallel, with the flow direction from the left end pressure plate to the right end pressure plate.

[0009] Preferably, the oxygen-side alkaline solution first channel, oxygen-side alkaline solution second channel, hydrogen and alkaline solution first to fifth channels, and oxygen and alkaline solution first to fourth channels are arranged in parallel, with the flow direction from the right end pressure plate to the left end pressure plate.

[0010] Preferably, the hydrogen-side alkaline solution inflow channel is connected to the first, second, and third hydrogen-side alkaline solution channels, respectively, and the hydrogen and alkaline solution outflow channels are connected to the first to fifth hydrogen and alkaline solution channels, respectively; the oxygen-side alkaline solution inflow channel is connected to the first, second, and third oxygen-side alkaline solution channels, respectively, and the oxygen and alkaline solution outflow channels are connected to the first to fourth oxygen and alkaline solution channels, respectively.

[0011] Preferably, the working pressure of the electrode plate is 1.6 MPa, and the cross-sectional shape of the hydrogen-side alkaline elongated circumferential groove, the oxygen-alkaline elongated circumferential groove, and the oxygen-side alkaline elongated circumferential groove is elongated circumferential.

[0012] The working process of this utility model is as follows:

[0013] This square electrolyzer's flow field structure achieves efficient hydrogen production through independent circulation on the hydrogen and oxygen sides. The hydrogen-side alkali solution enters through the hydrogen-side alkali solution inlet on the left end plate, is diverted through the elongated circular channel to the parallel hydrogen-side alkali solution channels one, two, and three, and flows from left to right, evenly distributing to the cathode side of each electrolysis chamber. During the electrochemical reaction, the hydrogen gas generated at the cathode and the remaining alkali solution flow in opposite directions through the first to fifth hydrogen and alkali solution channels to the hydrogen and alkali solution outlet on the left end plate, entering the gas-liquid separation system. The separated alkali solution is then recirculated. The oxygen-side alkali solution enters through the oxygen-side alkali solution inlet, flows through the third oxygen-side alkali solution channel to the right end plate, is diverted to the first and second oxygen-side alkali solution channels, and flows from right to left, distributing to the anode side to generate oxygen. The oxygen and alkali solution flow in opposite directions through the first to fourth oxygen and alkali solution channels to the oxygen and alkali solution outlet on the left end plate, completing an independent circulation. The two circulations are completely isolated from the axial holes and radial channels of the electrode plates through the sealing gaskets, avoiding cross-contamination of gases. At the same time, the multi-stage parallel flow channel design ensures the uniformity of the flow field and the mass transfer efficiency, ultimately achieving the efficient production of high-purity hydrogen and oxygen and the stable operation of the system.

[0014] The beneficial effects of this utility model are as follows:

[0015] (1) This utility model avoids cross-contamination of hydrogen and oxygen gases through the physical isolation flow channel design, significantly improves gas purity, and enhances the stability of the electrolytic cell when operating at low load.

[0016] (2) This utility model adopts a multi-channel parallel layout and reverse flow design to ensure uniform distribution of the flow field inside the electrolytic cell, greatly improve the mass transfer efficiency, and effectively alleviate the problems of local overheating and excessive impedance.

[0017] (3) This utility model reduces the volume of the electrolyzer and energy consumption by operating under a high voltage of 1.6MPa, adapting to the large-scale hydrogen production demand under the scenario of renewable energy fluctuations, and taking into account both efficiency and safety. Attached Figure Description

[0018] Figure 1 is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 is a schematic diagram of the left end pressure plate structure;

[0020] Figure 3 is a schematic diagram of the assembly of the electrode plate and the sealing gasket;

[0021] Figure 4 is a schematic diagram of the hydrogen-side circulation channel;

[0022] Figure 5 is a schematic diagram of the oxygen-side circulation channel;

[0023] In the diagram: 1. Left end pressure plate; 11. Hydrogen-side alkaline solution inlet; 12. Oxygen-side alkaline solution inlet; 13. Hydrogen and alkaline solution outlet; 14. Oxygen and alkaline solution outlet; 15. Hydrogen-side alkaline solution elongated groove; 16. Hydrogen and alkaline solution elongated groove; 17. Oxygen and alkaline solution elongated groove; 2. Square tank; 3. Electrode plate; 31. Electrode plate oxygen and alkaline solution hole; 32. Electrode plate hydrogen and alkaline solution hole; 33. Electrode plate alkaline solution hole; 4. Oxygen-side sealing gasket; 41. Oxygen-side sealing gasket oxygen and alkaline solution hole; 42. Oxygen-side sealing gasket hydrogen and alkaline solution hole; 43. Oxygen and alkaline solution outflow channel; 44. Oxygen-side sealing gasket alkaline solution hole; 45. Oxygen-side alkaline solution inflow channel; 5. Right end pressure plate; 51. Oxygen-side alkaline solution elongated groove; 6. Hydrogen-side sealing gasket; 61. Hydrogen-side sealing gasket oxygen and... 62. Alkali solution orifice, 63. Hydrogen-side sealing gasket hydrogen and alkali solution orifice, 64. Hydrogen-side sealing gasket alkali solution orifice, 65. Hydrogen-side alkali solution inflow channel, A1. Hydrogen-side alkali solution first channel, A2. Hydrogen-side alkali solution second channel, A3. Hydrogen-side alkali solution third channel, B1. Oxygen-side alkali solution first channel, B2. Oxygen-side alkali solution second channel, B3. Oxygen-side alkali solution third channel, C1. Oxygen and alkali solution first channel, C2. Oxygen and alkali solution second channel, C3. Oxygen and alkali solution third channel, C4. Oxygen and alkali solution fourth channel, D1. Hydrogen and alkali solution first channel, D2. Hydrogen and alkali solution second channel, D3. Hydrogen and alkali solution third channel, D4. Hydrogen and alkali solution fourth channel, D5. Hydrogen and alkali solution fifth channel. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings.

[0025] As shown in Figures 1-5, a flow channel structure for a square electrolytic cell includes a square tank 2. A left end pressure plate 1 and a right end pressure plate 5 are fixedly installed at both ends of the square tank 2. A hydrogen-side sealing gasket 6, an electrode plate 3, and an oxygen-side sealing gasket 4 are sequentially arranged between the left end pressure plate 1 and the right end pressure plate 5. The electrode plate 3 is located between the hydrogen-side sealing gasket 6 and the oxygen-side sealing gasket 4. The hydrogen-side sealing gasket 6 is adjacent to the left end pressure plate 1, and the oxygen-side sealing gasket 4 is adjacent to the right end pressure plate 5. The left end pressure plate 1 has an axial hydrogen-side alkali inlet 11, an axial oxygen-side alkali inlet 12, an axial hydrogen and alkali outlet 13, and an axial oxygen and alkali outlet 14. The inner side of the left end pressure plate 1 also has a hydrogen-side alkali elongated groove 15, a hydrogen and alkali elongated groove 16, and an oxygen outlet. The alkali solution elongated trough 17 is provided with an oxygen-side alkali solution elongated trough 51 on the inner side of the right end pressure plate 5; the hydrogen-side sealing gasket 6 is provided with a radial hydrogen-side alkali solution inflow channel 65 and a radial hydrogen and alkali solution outflow channel 63, and the oxygen-side sealing gasket 4 is provided with a radial oxygen-side alkali solution inflow channel 45 and a radial oxygen and alkali solution outflow channel 43; the hydrogen-side sealing gasket 6, the electrode plate 3, and the oxygen-side sealing gasket 4 are all provided with electrode plate alkali solution holes 33, oxygen-side sealing gasket alkali solution holes 44, hydrogen-side sealing gasket alkali solution holes 64, electrode plate hydrogen and alkali solution holes 32, oxygen-side sealing gasket hydrogen and alkali solution holes 42, hydrogen-side sealing gasket hydrogen and alkali solution holes 62, and electrode plate oxygen and alkali solution holes 31, oxygen-side sealing gasket oxygen and alkali solution holes 41, and hydrogen-side sealing gasket oxygen and alkali solution holes 61;

[0026] The axial hydrogen-side alkaline inlet 11 is connected to the hydrogen-side sealing gasket alkaline hole 64 via the hydrogen-side alkaline elongated groove 15, forming the hydrogen-side alkaline first channel A1, the hydrogen-side alkaline second channel A2, and the hydrogen-side alkaline third channel A3; the axial oxygen-side alkaline inlet 12 is connected to the oxygen-side sealing gasket alkaline hole 44 via the oxygen-side alkaline elongated groove 51, forming the oxygen-side alkaline first channel B1, the oxygen-side alkaline second channel B2, and the oxygen-side alkaline third channel B3; the axial hydrogen and alkaline outlet 13 is connected to the hydrogen and alkaline hole 62 of the hydrogen-side sealing gasket via the hydrogen and alkaline elongated groove 16, forming the hydrogen and alkaline first channel D1 to the fifth channel D5; the axial oxygen and alkaline outlet 14 is connected to the oxygen and alkaline hole 41 of the oxygen-side sealing gasket via the oxygen and alkaline elongated groove 17, forming the oxygen and alkaline first channel C1 to the fourth channel C4.

[0027] The hydrogen-side alkaline solution first channel A1, hydrogen-side alkaline solution second channel A2, hydrogen-side alkaline solution third channel A3 and oxygen-side alkaline solution third channel B3 are arranged in parallel, with the flow direction from the left end pressure plate 1 to the right end pressure plate 5.

[0028] The oxygen-side alkaline solution first channel B1, the oxygen-side alkaline solution second channel B2, the hydrogen and alkaline solution first channel D1 to the fifth channel D5, and the oxygen and alkaline solution first channel C1 to the fourth channel C4 are arranged in parallel, with the flow direction from the right end pressure plate 5 to the left end pressure plate 1.

[0029] The hydrogen-side alkaline solution inflow channel 65 is connected to the first hydrogen-side alkaline solution channel A1, the second hydrogen-side alkaline solution channel A2, and the third hydrogen-side alkaline solution channel A3, respectively. The hydrogen and alkaline solution outflow channel 63 is connected to the first hydrogen and alkaline solution channel D1 to the fifth channel D5, respectively. The oxygen-side alkaline solution inflow channel 45 is connected to the first oxygen-side alkaline solution channel B1, the second oxygen-side alkaline solution channel B2, and the third oxygen-side alkaline solution channel B3, respectively. The oxygen and alkaline solution outflow channel 43 is connected to the first oxygen and alkaline solution channel C1 to the fourth channel C4, respectively.

[0030] The working pressure of the electrode plate 3 is 1.6 MPa, and the cross-sectional shape of the hydrogen-side alkaline elongated circumferential groove 15, the oxygen and alkaline elongated circumferential groove 17, and the oxygen-side alkaline elongated circumferential groove 51 is elongated circumferential.

[0031] The working process of this utility model is as follows:

[0032] The flow field structure of this square electrolyzer achieves efficient hydrogen production through independent circulation on the hydrogen and oxygen sides. The hydrogen-side alkali solution enters from the hydrogen-side alkali solution inlet 11 of the left end pressure plate 1, and is diverted through the hydrogen-side alkali solution elongated groove 15 to the parallel hydrogen-side alkali solution first channel A1, hydrogen-side alkali solution second channel A2, and hydrogen-side alkali solution third channel A3. It flows from the left end pressure plate 1 to the right end pressure plate 5, and is evenly distributed to the cathode side of each electrolysis chamber through the radial hydrogen-side alkali solution inflow channel 65 of the hydrogen-side sealing gasket 6. In the electrochemical reaction, the hydrogen gas generated at the cathode and the remaining alkali solution flow out through the hydrogen gas and alkali solution outflow channel 63 of the hydrogen-side sealing gasket 6, enter the hydrogen gas and alkali solution first channel D1 to fifth channel D5, and flow back to the hydrogen gas and alkali solution elongated groove 16 of the left end pressure plate 1. Finally, it is discharged from the hydrogen gas and alkali solution outlet 13 and enters the downstream gas-liquid separation system. The separated alkali solution is recirculated to the hydrogen-side alkali solution inlet 11.

[0033] Oxygen-side alkaline solution enters through oxygen-side alkaline solution inlet 12, flows through oxygen-side alkaline solution third channel B3 to right end pressure plate 5, and is divided through oxygen-side alkaline solution elongated trough 51 to oxygen-side alkaline solution first channel B1 and oxygen-side alkaline solution second channel B2. It flows from right end pressure plate 5 to left end pressure plate 1 and is distributed to the anode side through the radial oxygen-side alkaline solution inflow channel 45 of oxygen-side sealing gasket 4. The oxygen generated at the anode and the remaining alkaline solution flow out through oxygen-side sealing gasket 44 oxygen-alkaline solution outflow channel 43, enter oxygen-alkaline solution first channel C1 to fourth channel C4, and flow in reverse to oxygen-alkaline solution elongated trough 17 of left end pressure plate 1, and finally exit from oxygen-alkaline solution outlet 14, completing independent circulation.

[0034] The hydrogen-side sealing gasket 6 and the oxygen-side sealing gasket 4 are connected to the corresponding holes of the electrode plate 3 through axial alkaline solution holes, axial hydrogen and alkaline solution holes, and axial oxygen and alkaline solution holes, forming physically isolated independent flow channels. The multi-stage parallel channel and reverse flow design ensures the uniformity of the flow field. Combined with the 1.6MPa high-pressure working condition of the electrode plate 3, it significantly improves gas purity, circulation efficiency and system stability.

[0035] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, based on the technical teachings provided by this utility model and as common knowledge in the field, other equivalent modifications and improvements can be made, and these should also be considered within the protection scope of this utility model.

Claims

1. A flow field channel structure for a square electrolytic cell, characterized in that, The system includes a square tank (2), with a left end pressure plate (1) and a right end pressure plate (5) fixedly installed at both ends of the square tank (2); a hydrogen-side sealing gasket (6), an electrode plate (3), and an oxygen-side sealing gasket (4) are arranged sequentially between the left end pressure plate (1) and the right end pressure plate (5), wherein the electrode plate (3) is located between the hydrogen-side sealing gasket (6) and the oxygen-side sealing gasket (4), the hydrogen-side sealing gasket (6) is adjacent to the left end pressure plate (1), and the oxygen-side sealing gasket (4) is adjacent to the right end pressure plate (5); the left end pressure plate (1) is provided with an axial hydrogen-side alkaline inlet (11), an axial oxygen-side alkaline inlet (12), an axial hydrogen and alkaline outlet (13), and an axial oxygen and... The alkaline outlet (14) is provided with a hydrogen-side alkaline elongated groove (15), a hydrogen and alkaline elongated groove (16), and an oxygen and alkaline elongated groove (17) on the inner side of the left end pressure plate (1); an oxygen-side alkaline elongated groove (51) is provided on the inner side of the right end pressure plate (5); the hydrogen-side sealing gasket (6) is provided with a radial hydrogen-side alkaline inflow channel (65) and a radial hydrogen and alkaline outflow channel (63), and the oxygen-side sealing gasket (4) is provided with a radial oxygen-side alkaline inflow channel (45) and a radial oxygen and alkaline outflow channel (43); the hydrogen-side sealing gasket (6), the electrode plate (3), and the oxygen-side sealing gasket (4) are all provided with electrode plate alkaline holes (33) and oxygen-side sealing gaskets (4). Alkali solution hole (44) on the sealing gasket, alkali solution hole (64) on the hydrogen side sealing gasket, hydrogen and alkali solution hole (32) on the electrode plate, hydrogen and alkali solution hole (42) on the oxygen side sealing gasket, hydrogen and alkali solution hole (62) on the hydrogen side sealing gasket, oxygen and alkali solution hole (31) on the electrode plate, oxygen and alkali solution hole (41) on the oxygen side sealing gasket, and oxygen and alkali solution hole (61) on the hydrogen side sealing gasket; the axial hydrogen side alkali solution inlet (11) is connected to the alkali solution hole (64) on the hydrogen side sealing gasket through the hydrogen side alkali solution elongated groove (15), forming the first hydrogen side alkali solution channel (A1), the second hydrogen side alkali solution channel (A2), and the third hydrogen side alkali solution channel (A3); the axial oxygen side alkali solution inlet (12 ... (44), the second hydrogen side alkali solution channel (64), the third hydrogen side alkali solution channel (A3), and the third hydrogen side alkali solution channel (A3) on the hydrogen side sealing gasket (44), the second hydrogen side alkali solution channel (64), the third hydrogen side alkali solution channel (A3), and the third hydrogen side alkali solution channel (A3) on the hydrogen side sealing gasket (44), the second hydrogen side alkali solution channel (64), the third hydrogen side alkali solution channel (A3), and the third hydrogen side alkali solution channel (A3) on the hydrogen side sealing The oxygen-side alkaline elongated groove (51) is connected to the oxygen-side sealing gasket alkaline hole (44) to form the oxygen-side alkaline first channel (B1), oxygen-side alkaline second channel (B2) and oxygen-side alkaline third channel (B3); the axial hydrogen and alkaline outlet (13) is connected to the hydrogen-side sealing gasket hydrogen and alkaline hole (62) through the hydrogen and alkaline elongated groove (16) to form the hydrogen and alkaline first channel (D1) to the fifth channel (D5); the axial oxygen and alkaline outlet (14) is connected to the oxygen-side sealing gasket oxygen and alkaline hole (41) through the oxygen and alkaline elongated groove (17) to form the oxygen and alkaline first channel (C1) to the fourth channel (C4).

2. The flow field channel structure of a square electrolytic cell according to claim 1, characterized in that: The hydrogen-side alkaline solution first channel (A1), hydrogen-side alkaline solution second channel (A2), hydrogen-side alkaline solution third channel (A3) and oxygen-side alkaline solution third channel (B3) are arranged in parallel, and the flow direction is from the left end pressure plate (1) to the right end pressure plate (5).

3. The flow field channel structure of a square electrolytic cell according to claim 1 or 2, characterized in that: The oxygen-side alkaline solution first channel (B1), oxygen-side alkaline solution second channel (B2), hydrogen and alkaline solution first channel (D1) to fifth channel (D5), and oxygen and alkaline solution first channel (C1) to fourth channel (C4) are arranged in parallel, with the flow direction from the right end pressure plate (5) to the left end pressure plate (1).

4. The flow field channel structure of a square electrolytic cell according to claim 3, characterized in that: The hydrogen-side alkaline solution inflow channel (65) is connected to the first hydrogen-side alkaline solution channel (A1), the second hydrogen-side alkaline solution channel (A2), and the third hydrogen-side alkaline solution channel (A3), respectively. The hydrogen and alkaline solution outflow channel (63) is connected to the first hydrogen and alkaline solution channel (D1) to the fifth channel (D5), respectively. The oxygen-side alkaline solution inflow channel (45) is connected to the first oxygen-side alkaline solution channel (B1), the second oxygen-side alkaline solution channel (B2), and the third oxygen-side alkaline solution channel (B3), respectively. The oxygen and alkaline solution outflow channel (43) is connected to the first oxygen and alkaline solution channel (C1) to the fourth channel (C4), respectively.

5. The flow field channel structure of a square electrolytic cell according to claim 4, characterized in that: The working pressure of the electrode plate (3) is 1.6 MPa, and the cross-sectional shape of the hydrogen-side alkaline elongated circumferential groove (15), the oxygen and alkaline elongated circumferential groove (17), and the oxygen-side alkaline elongated circumferential groove (51) is elongated circumferential.

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