TWI740670B - High-pressure water electrolysis system - Google Patents

Abstract

A high-pressure water electrolysis system includes a water electrolysis unit, a liquid water input unit, a hydrogen output unit, and an oxygen output unit. The water electrolysis unit includes a membrane electrode assembly. The liquid water input unit is configured to pressurize liquid water to a predetermined water pressure, and then deliver to the water electrolysis unit. The hydrogen output unit is configured to receive the hydrogen generated by the water electrolysis unit and adjust the pressure of the hydrogen to a first predetermined gas pressure. The oxygen output unit is configured to receive the oxygen generated by the water electrolysis unit and adjust the pressure of the oxygen to a second predetermined gas pressure.

Description

High pressure water electrolysis system

The invention relates to a water electrolysis system, in particular to a high-pressure water electrolysis system based on a proton exchange membrane.

In the prior art, the oxygen and hydrogen produced by a water electrolysis system based on a proton exchange membrane generally do not have a high gas pressure. To store these gases in a gas storage device (such as a gas cylinder), the water electrolysis system needs to be equipped with an additional gas pressurizing device (such as a gas pressurizing pump) to pressurize these gases. However, the installation cost of a general gas pressurizing device is quite high. As a result, the overall construction cost of the proton exchange membrane water electrolysis system will be greatly increased.

Therefore, the inventor believes that the above-mentioned shortcomings can be improved, and with great concentration of research and the application of scientific principles, we finally propose an invention with reasonable design and effective improvement of the above-mentioned shortcomings.

The technical problem to be solved by the present invention is to provide a high-pressure water electrolysis system in view of the shortcomings of the prior art.

In order to solve the above technical problems, one of the technical solutions adopted by the present invention is to provide a high-pressure water electrolysis system, which includes: a water electrolysis unit including at least one membrane electrode group; a liquid water input unit, which is arranged at One side of the water electrolysis unit, and the liquid water input unit is spatially connected to the water electrolysis unit; wherein, the liquid water input The unit is configured to pressurize a liquid water to a predetermined water pressure, and then deliver the pressurized liquid water to the water electrolysis unit, so that the membrane electrode assembly contacts the pressurized liquid water; Wherein, the water electrolysis unit can electrolyze the pressurized liquid water into oxygen and hydrogen through the membrane electrode assembly; a hydrogen output unit, which is arranged on the water electrolysis unit relative to the liquid water input The other side of the unit, and the hydrogen output unit is spatially connected to the water electrolysis unit; wherein the hydrogen output unit is configured to receive the hydrogen generated by the water electrolysis unit and adjust the pressure of the hydrogen , So that the hydrogen can be maintained at a first predetermined gas pressure; and an oxygen output unit, which is arranged on the same side of the water electrolysis unit relative to the liquid water input unit, and the oxygen output unit is in the space Connected to the water electrolysis unit; wherein, the oxygen output unit is configured to receive the oxygen generated by the water electrolysis unit, and to adjust the pressure of the oxygen, so that the oxygen can be maintained at a second predetermined gas pressure .

One of the beneficial effects of the present invention is that the high-pressure water electrolysis system provided by the present invention can pressurize a liquid water to a predetermined water pressure through "the liquid water input unit is configured, and then the pressurized water The liquid water is delivered to the water electrolysis unit, so that the membrane electrode assembly contacts the pressurized liquid water", "the hydrogen output unit is configured to receive the hydrogen generated by the water electrolysis unit, and to The pressure of the hydrogen is adjusted so that the hydrogen can be maintained at a first predetermined gas pressure" and "the oxygen output unit is configured to receive the oxygen generated by the water electrolysis unit and adjust the pressure of the oxygen to The technical solution of enabling the oxygen to be maintained at a second predetermined gas pressure, so that the high-pressure water electrolysis system of this embodiment does not need to be equipped with an additional gas pressurizing device to pressurize these gases, thereby greatly reducing the gas pressure. The installation cost of the pressurizing device.

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and drawings about the present invention. However, the provided drawings are only for reference and description, and are not used to limit the present invention.

S: High pressure water electrolysis system

1. 1’: Water electrolysis unit

11: Proton exchange membrane

12: anode

13: Cathode

14a: anode current collector

14b: Cathode current collector

15a: anode flow field plate

15b: Cathode flow field plate

16a, 16a’: anode end plate

161a’: curved groove

16b, 16b’: Cathode end plate

161b’: Arc groove

162: Bundle

17: Sealing element

2: Liquid water input unit

21: Liquid water supply device

22: Liquid water input pipeline

23: Liquid water pressurization device

3: Hydrogen output unit

31: Hydrogen storage device

32: The first air pressure adjustment device

33: Hydrogen output pipeline

4: Oxygen output unit

41: Oxygen storage device

42: The second air pressure adjustment device

43: Oxygen output line

5: Power supply unit

FIG. 1 is a schematic diagram of the architecture of a high-pressure water electrolysis system according to a first embodiment of the present invention.

Fig. 2 is a schematic side view of the structure of the water electrolysis unit according to the first embodiment of the present invention.

Fig. 3 is a schematic side view of the structure of a water electrolysis unit according to a second embodiment of the present invention.

Fig. 4 is a three-dimensional exploded view of the structure of a water electrolysis unit according to a second embodiment of the present invention.

Fig. 5 is a three-dimensional assembly view of a water electrolysis unit structure according to a second embodiment of the present invention.

Fig. 6 is a perspective schematic view of the structure of the water electrolysis unit according to the second embodiment of the present invention, which is fixed by winding a wire.

The following are specific specific examples to illustrate the disclosed embodiments of the present invention, and those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be based on different viewpoints and applications, and various modifications and changes can be made without departing from the concept of the present invention. In addition, the drawings of the present invention are merely schematic illustrations, and are not drawn according to actual dimensions, and are stated in advance. The following embodiments will further describe the related technical content of the present invention in detail, but the disclosed content is not intended to limit the protection scope of the present invention.

It should be understood that although terms such as "first", "second", and "third" may be used herein to describe various elements or signals, these elements or signals should not be limited by these terms. These terms are mainly used to distinguish one element from another, or one signal from another signal. In addition, the term "or" used in this document may include any one or a combination of more of the associated listed items depending on the actual situation.

[First Embodiment]

Please refer to Figure 1 and Figure 2. Figure 1 is a high-pressure water electrolysis according to the first embodiment of the present invention. A schematic diagram of the system architecture of the system, and FIG. 2 is a schematic side view of the structure of the water electrolysis unit according to the first embodiment of the present invention. The high-pressure water electrolysis system S of the first embodiment of the present invention includes: a water electrolysis unit 1, a liquid water input unit 2, a hydrogen output unit 3, an oxygen output unit 4, and a power supply unit 5. Hereinafter, the specific structure of each unit of the high-pressure water electrolysis system S will be described separately, and then the connection relationship between each unit and other units will be described in a timely manner.

As shown in Figure 2, the water electrolysis unit 1 is a proton exchange membrane (PEM) water electrolysis device. The water electrolysis unit 1 mainly includes a proton exchange membrane 11, an anode 12 and a cathode 13. The proton exchange membrane 11, the anode 12, and the cathode 13 together form a membrane electrode group, wherein the anode 12 is arranged on one side of the proton exchange membrane 11, and the cathode 13 is arranged on the opposite side of the proton exchange membrane 11. One side.

In this embodiment, the proton exchange membrane 11 is a solid electrolyte polymer membrane (such as a perfluorosulfonic acid membrane), but the present invention is not limited to this. The proton exchange membrane 11 can be used to transfer protons (such as hydrogen ion H ⁺ ), and the proton exchange membrane 11 can be used to block gas and electrons.

The anode 12 mainly includes an anode catalyst layer, and the anode catalyst layer is formed on a first surface (not labeled) of the proton exchange membrane 11. For example, the composition of the anode 12 mainly includes iridium dioxide (IrO ₂ ), but the present invention is not limited thereto. The anode catalyst layer can be, for example, ultrasonically oscillated to form an iridium dioxide dispersion liquid with a specific ratio of iridium dioxide powder, a perfluorosulfonic acid polymer solution, and at least one additive, and then disperse the iridium dioxide The liquid is stirred uniformly, and then formed on a transfer substrate by spraying. The additive in the anode catalyst layer may be, for example, a catalyst that facilitates the generation of oxygen.

The cathode 13 mainly includes a cathode catalyst layer, and the cathode catalyst layer is formed on a second surface (not labeled) of the proton exchange membrane 11. For example, the composition of the cathode 13 mainly includes Pt/C (platinum catalyst is supported on a carbon material), and the cathode 13 may be, for example, a gas diffusion electrode (GDE). Wherein, the above-mentioned anode 12 and cathode 13 can be, for example, combined with a hot pressing method. The sub-exchange membranes 11 are combined together, but the present invention is not limited to this.

When an operating voltage (such as an operating voltage between 1.5V and 3V) is applied to the water electrolysis unit 1, the anode 12 reacts under the catalytic action of containing iridium dioxide to produce oxygen, and its half reaction is as Formula (I) is shown, and the cathode 13 reacts under the catalysis of the cathode catalyst layer to generate hydrogen, and its half reaction is also shown in Formula (II).

2H ₂ O → O ₂ +4H ⁺ +4e ^- formula (I)

4H ^{+ +} 4e ^- → 2H ₂ of formula (II)

Please refer to FIG. 2 again, in addition to the membrane electrode group consisting of the proton exchange membrane 11, the anode 12, and the cathode 13, the water electrolysis unit 1 also includes an anode current collector 14a and a cathode current collector 14b (current collector), an anode flow field plate 15a and a cathode flow field plate 15b (field flow plate), an anode end plate 16a and a cathode end plate 16b (end plate), and a sealing element 17.

Wherein, the anode current collector 14a, the anode flow field plate 15a, and the anode end plate 16a are located on the same side as the anode 12. The cathode current collector 14b, the cathode flow field plate 15b, and the cathode end plate 16b are located on the same side as the cathode 13. Furthermore, the sealing element 17 surrounds the membrane electrode group.

In this embodiment, the anode current collector 14a and the cathode current collector 14b may be a water-permeable metal structure with electrocatalytically active particles. The anode current collector 14a and the cathode current collector 14b can be used in combination with polytetrafluoroethylene (PTFE) membranes. Both the anode flow field plate 15a and the cathode flow field plate 15b have conductivity and airtightness. The material of the anode flow field plate 15a may be titanium-coated stainless steel, and the material of the cathode flow field plate 15b may be stainless steel, but the present invention is not limited thereto. The anode end plate 16a and the cathode end plate 16b are respectively arranged on the outermost side of the water electrolysis unit 1 and have a water collection function. Furthermore, the anode end plate 16a and the cathode end plate 16b can be used to maintain a fixed and uniform pressure inside the device to stabilize the internal reaction.

Please continue to refer to Figure 1, the liquid water input unit 2 is arranged on one side of the water electrolysis unit 1, the liquid water input unit 2 is spatially connected to the water electrolysis unit 1, and the liquid The water input unit 2 is configured to provide liquid water required by the water electrolysis unit 1 to generate a water electrolysis reaction.

More specifically, the liquid water input unit 2 includes a liquid water supply device 21, a liquid water input pipeline 22, and a liquid water pressurizing device 23. The liquid water supply device 21 is configured to supply liquid water to the water electrolysis unit 1 through a liquid water input pipeline 22. In this embodiment, the liquid water supply device 21 may be, for example, an ion exchange pure water device, but the present invention is not limited to this.

The liquid water pressurizing device 23 is arranged on the water flow path of the liquid water input pipeline 22. The liquid water pressurizing device 23 is configured to pressurize the liquid water circulating in the liquid water input pipeline 22 so that the liquid water is pressurized to a predetermined water pressure. Furthermore, the liquid water pressurized to the predetermined water pressure can continue to flow into the water electrolysis unit 1 through the liquid water input pipeline 22.

Furthermore, the predetermined water pressure may be, for example, between 150 bar and 350 bar, preferably between 160 bar and 340 bar, and particularly preferably between 170 bar and 330 bar. In other words, the liquid water pressurized by the liquid water pressurizing device 23 can have a water pressure between 150 bar and 350 bar. In this embodiment, the liquid water pressurizing device 23 may be, for example, a hydraulic pressurized pump or a hydraulic pressurized motor, but the present invention is not limited to this.

It is worth mentioning that in the prior art, the oxygen and hydrogen produced by the water electrolysis system based on the proton exchange membrane generally do not have a high gas pressure. To store these gases in a gas storage device (such as a gas cylinder), the water electrolysis system needs to be equipped with an additional gas pressurizing device (such as a gas pressurizing pump) to pressurize these gases. However, the installation cost of a general gas pressurizing device is quite high. As a result, the overall construction cost of the proton exchange membrane water electrolysis system will be greatly increased.

Compared with the prior art, in this embodiment, since the liquid water flowing into the water electrolysis unit 1 is pressurized high-pressure liquid water, the oxygen generated by the reaction of the water electrolysis unit 1 can have a high gas pressure, and The hydrogen generated by the reaction of the water electrolysis unit 1 can also have a high gas pressure.

In this way, the above-mentioned oxygen with high gas pressure can be directly stored in an oxygen storage device (such as an oxygen cylinder), and the above-mentioned hydrogen with high gas pressure can be directly stored in a hydrogen storage device (such as a hydrogen cylinder) middle. In this way, the high-pressure water electrolysis system S of this embodiment does not need to be provided with an additional gas pressurizing device to pressurize these gases, thereby greatly reducing the installation cost of the gas pressurizing device.

Please continue to refer to FIG. 1, the hydrogen output unit 3 is arranged on the other side of the water electrolysis unit 1. In this embodiment, the hydrogen output unit 3 is arranged on the other side of the water electrolysis unit 1 relative to the liquid water input unit 2. The hydrogen output unit 3 is spatially connected to the water electrolysis unit 1, and the hydrogen output unit 3 is configured to receive the hydrogen generated by the reaction of the water electrolysis unit 1.

More specifically, the hydrogen output unit 3 includes a hydrogen storage device 31, a first gas pressure adjusting device 32, and a hydrogen output pipeline 33. The hydrogen storage device 31 is configured to receive and store the hydrogen generated by the reaction of the electrolysis unit 1 through the hydrogen output pipeline 33. In this embodiment, the hydrogen storage device 31 may be, for example, a hydrogen gas cylinder, which can be used to store hydrogen with a high gas pressure, but the present invention is not limited thereto.

The first air pressure adjusting device 32 is arranged on the gas flow path of the hydrogen output pipe 33. The first air pressure adjusting device 32 is configured to adjust the pressure of the hydrogen flowing in the hydrogen output pipeline 33 so that the hydrogen in the pipeline can be maintained at a first predetermined gas pressure. Furthermore, the hydrogen maintained at the first predetermined gas pressure can continuously flow in through the hydrogen output pipe 33 and be stored in the hydrogen storage device 31.

Furthermore, the first predetermined gas pressure may be, for example, between 150 bar and 350 bar, preferably between 160 bar and 340 bar, and particularly preferably between 170 bar and 330 bar. That is to say, the hydrogen gas that has been pressure-adjusted by the first gas pressure adjusting device 32 can have a gas pressure between 150 bar and 350 bar. In this embodiment, the first air pressure adjusting device 32 may be, for example, a back pressure valve (back pressure valve), but the present invention is not limited to this.

Please continue to refer to FIG. 1, the oxygen output unit 4 is arranged on one side of the water electrolysis unit 1. In this embodiment, the oxygen output unit 4 is arranged on the same side of the water electrolysis unit 1 relative to the liquid water input unit 2. The oxygen output unit 4 is spatially connected to the water electrolysis unit 1, and the oxygen output unit 4 is configured to receive oxygen generated by the reaction of the water electrolysis unit 1.

More specifically, the oxygen output unit 4 includes an oxygen storage device 41, a second gas pressure adjusting device 42, and an oxygen output pipeline 43. The oxygen storage device 41 is configured to receive and store the oxygen generated by the reaction of the electrolysis unit 1 through the oxygen output pipeline 43. In this embodiment, the oxygen storage device 41 may be, for example, an oxygen gas cylinder, which can be used to store oxygen with a high gas pressure, but the present invention is not limited to this.

The second air pressure adjusting device 42 is arranged on the air flow path of the oxygen output pipe 43. The second air pressure adjusting device 42 is configured to adjust the pressure of the oxygen circulating in the oxygen output pipe 43 so that the oxygen in the pipe can be maintained at a second predetermined gas pressure. Furthermore, the oxygen maintained at the second predetermined gas pressure can continue to flow in through the oxygen output pipe 43 and be stored in the oxygen storage device 41.

Furthermore, the second predetermined gas pressure may be, for example, between 150 bar and 350 bar, preferably between 160 bar and 340 bar, and particularly preferably between 170 bar and 330 bar. In other words, the oxygen gas that is pressure-adjusted by the second air pressure adjusting device 42 can have an air pressure between 150 bar and 350 bar. In this embodiment, the second air pressure adjusting device 42 may be, for example, a back pressure valve (back pressure valve), but the present invention is not limited to this.

It is worth mentioning that since the liquid water flowing into the water electrolysis unit 1 is pressurized high-pressure liquid water, the oxygen generated by the reaction of the water electrolysis unit 1 can have a high gas pressure, and passes through the water electrolysis The hydrogen produced by the reaction of unit 1 can also have a high gas pressure. However, the above-mentioned oxygen or hydrogen may be quickly released after being output from the water electrolysis unit 1. In this way, the pressure on both sides of the membrane electrode group (including the proton exchange membrane 11, the anode 12, and the cathode 13) in the water electrolysis unit 1 The force difference may become too large, causing structural damage to the membrane electrode assembly.

In order to overcome the above technical problems, the high-pressure water electrolysis system S of this embodiment is provided with a first air pressure adjusting device 32 on the air flow path of the hydrogen output pipe 33, and a second air pressure is provided on the air flow path of the oxygen output pipe 43. Adjusting device 42. Thereby, the pressure of the hydrogen gas output from the water electrolysis unit 1 can be maintained at the first predetermined gas pressure by the first gas pressure adjustment device 32, and the pressure of the oxygen gas output from the water electrolysis unit 1 can be adjusted by the second gas pressure adjustment device 42. Maintain at the second predetermined gas pressure.

In an embodiment of the present invention, the predetermined water pressure set by the liquid water pressurizing device 23 is not less than the first predetermined gas pressure set by the first air pressure adjusting device 32, and is not less than the second air pressure adjusting device 42. The set second predetermined gas pressure. Furthermore, the absolute value of the difference between the predetermined water pressure and the first predetermined gas pressure is not greater than 10 bar, and preferably not greater than 5 bar. In addition, the absolute value of the difference between the predetermined water pressure and the second predetermined gas pressure is not more than 10 bar, and preferably not more than 5 bar, but the present invention is not limited to this.

According to the above configuration, the pressure difference between the two sides of the membrane electrode group (including the proton exchange membrane 11, the anode 12, and the cathode 13) in the water electrolysis unit 1 can be maintained within a certain range, so that the membrane in the water electrolysis unit 1 The electrode group can be in a high pressure but stable pressure environment. Thereby, the structural damage of the membrane electrode assembly can be avoided, and the reliability of the membrane electrode assembly can be improved.

Furthermore, the power supply unit 5 is electrically connected to the anode 12 and the cathode 13 of the water electrolysis unit 1 to form an electrical circuit. The power supply unit 5 is configured to provide the operating voltage required by the water electrolysis unit 1 to generate a water electrolysis reaction. In this embodiment, the operating voltage provided by the power supply unit 5 may be, for example, between 1.5V and 3.0V, but the present invention is not limited to this.

[Second Embodiment]

Please refer to FIGS. 3 to 6. FIG. 3 is a schematic side view of the structure of the water electrolysis unit according to the second embodiment of the present invention, and FIG. 4 is a three-dimensional decomposition of the structure of the water electrolysis unit according to the second embodiment of the present invention. 5 is a three-dimensional assembly diagram of a water electrolysis unit structure according to a second embodiment of the present invention, and FIG. 6 is a three-dimensional schematic diagram of a water electrolysis unit structure according to the second embodiment of the present invention fixed by winding a wire.

The water electrolysis unit 1'of this embodiment is substantially the same as the above-mentioned first embodiment. The difference is that the anode end plate 16a' and the cathode end plate 16b' (end plate) of the water electrolysis unit 1'of this embodiment have special features. The structure is designed so that the water electrolysis unit 1'of this embodiment can maintain a fixed and uniform pressure inside the device by winding and fixing the wire, so that the internal reaction is stable.

Specifically, the side surface of the anode end plate 16a' away from the proton exchange membrane 11 (or membrane electrode group) is an arc-shaped surface, and the arc-shaped surface protrudes away from the proton exchange membrane 11 ( As shown in Figure 3). The anode end plate 16a' has a plurality of arc-shaped grooves 161a' recessed inward from its arc-shaped surface, and the plurality of arc-shaped grooves 161a' are spaced apart from each other (Figures 4 and 5).

The side surface of the cathode end plate 16b' away from the proton exchange membrane 11 (or membrane electrode group) is an arc-shaped surface, and the arc-shaped surface protrudes in a direction away from the proton exchange membrane 11 (Figure 3) . In this embodiment, the arc-shaped surface of the anode end plate 16a' and the arc-shaped surface of the cathode end plate 16b' protrude away from each other. From another perspective, the arc-shaped surface of the anode end plate 16a' and the arc-shaped surface of the cathode end plate 16b' are arranged in mirror images relative to the proton exchange membrane 11 (or membrane electrode group), but the present invention is not limited to this.

The cathode end plate 16b' has a plurality of arc-shaped grooves 161b' recessed from its arc-shaped surface, and the plurality of arc-shaped grooves 161b' are spaced apart from each other (as shown in Figs. 4 and 5). In this embodiment, the arc-shaped grooves 161a' of the anode end plate 16a' and the arc-shaped grooves 161b' of the cathode end plate 16b' correspond to each other in position and number.

According to the above configuration, as shown in FIG. 6, the arc-shaped grooves 161a' of the anode end plate 16a' and the arc-shaped grooves 161b' of the cathode end plate 16b' can be matched with each other to provide at least one bundle The wire 162 is wound around a plurality of the arc-shaped grooves 161a' and 161b'. Thereby, the water electrolysis unit 1'can maintain a fixed and uniform pressure inside the device through the binding wire 162 in a winding and fixing manner, so that the internal The response is stable.

It is worth mentioning that in the prior art, the anode end plate and the cathode end plate of the general water electrolysis device are mainly fixed by screws to fix the internal stacked structure of the water electrolysis device. However, since the water electrolysis unit provided by the embodiment of the present invention is in a state of relatively high pressure during operation, if the internal stack structure of the water electrolysis device is only fixed by screw locking, it is There may be a problem that high-pressure liquid or high-pressure gas is easy to leak.

In order to overcome the above technical problems, the water electrolysis unit 1'of this embodiment can pass through its anode end plate 16a' and cathode end plate 16b' (end plate) with a special structural design, so that the water electrolysis unit 1'can pass through The binding wire is wound and fixed to maintain a fixed and uniform pressure inside the device and stabilize the internal reaction. That is to say, fixing the internal stack structure of the water electrolysis device by winding and fixing has a better fixing effect than fixing the internal stack structure of the water electrolysis device by screw locking, which can be effective. Improve the problem of easy leakage of high-pressure liquid or high-pressure gas.

[Beneficial effects of the embodiment]

One of the beneficial effects of the present invention is that the high-pressure water electrolysis system provided by the present invention can pressurize a liquid water to a predetermined water pressure through "the liquid water input unit is configured, and then the pressurized water The liquid water is delivered to the water electrolysis unit, so that the membrane electrode assembly contacts the pressurized liquid water", "the hydrogen output unit is configured to receive the hydrogen generated by the water electrolysis unit, and to The pressure of the hydrogen is adjusted so that the hydrogen can be maintained at a first predetermined gas pressure" and "the oxygen output unit is configured to receive the oxygen generated by the water electrolysis unit and adjust the pressure of the oxygen to The technical solution of enabling the oxygen to be maintained at a second predetermined gas pressure, so that the high-pressure water electrolysis system of this embodiment does not need to be equipped with an additional gas pressurizing device to pressurize these gases, thereby greatly reducing the gas pressure. The installation cost of the pressurizing device.

Furthermore, the high-pressure water electrolysis system of this embodiment is provided with a first air pressure adjusting device on the air flow path of the hydrogen output pipeline, and is provided on the air flow path of the oxygen output pipeline. Equipped with a second air pressure adjusting device. Thereby, the pressure of the hydrogen gas output from the water electrolysis unit can be maintained at the first predetermined gas pressure by the first gas pressure adjusting device, and the pressure of the oxygen gas output from the water electrolysis unit can be maintained at the second gas pressure by the second gas pressure adjusting device. Predetermined gas pressure. According to the above configuration, the pressure difference between the two sides of the membrane electrode group in the water electrolysis unit can be maintained within a certain range, so that the membrane electrode group in the water electrolysis unit can be in a high pressure but stable pressure environment. Thereby, the structural damage of the membrane electrode assembly can be avoided, and the reliability of the membrane electrode assembly can be improved.

Furthermore, the water electrolysis unit of this embodiment can be designed with a special structure of the anode end plate and the cathode end plate, so that the water electrolysis unit can maintain a fixed and uniform pressure inside the device by winding and fixing the wire. , Make the internal reaction stable. That is to say, fixing the internal stack structure of the water electrolysis device by winding and fixing has a better fixing effect than fixing the internal stack structure of the water electrolysis device by screw locking, which can be effective. Improve the problem of easy leakage of high-pressure liquid or high-pressure gas.

The content disclosed above is only the preferred and feasible embodiments of the present invention, and does not limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made using the description and schematic content of the present invention are included in the application of the present invention. Within the scope of the patent.

S: High pressure water electrolysis system

1: Water electrolysis unit

11: Proton exchange membrane

12: anode

13: Cathode

2: Liquid water input unit

21: Liquid water supply device

22: Liquid water input pipeline

23: Liquid water pressurization device

3: Hydrogen output unit

31: Hydrogen storage device

32: The first air pressure adjustment device

33: Hydrogen output pipeline

4: Oxygen output unit

41: Oxygen storage device

42: The second air pressure adjustment device

43: Oxygen output line

5: Power supply unit

Claims (10)

A high-pressure water electrolysis system, comprising: a water electrolysis unit, which includes at least one membrane electrode group; a liquid water input unit, which is arranged on one side of the water electrolysis unit, and the liquid water input unit is spatially Connected to the water electrolysis unit; wherein the liquid water input unit is configured to pressurize a liquid water to a predetermined water pressure, and then deliver the pressurized liquid water to the water electrolysis unit, so that The membrane electrode assembly contacts the pressurized liquid water; wherein the water electrolysis unit can electrolyze the pressurized liquid water into oxygen and hydrogen through the membrane electrode assembly; a hydrogen output unit, which Is arranged on the other side of the water electrolysis unit relative to the liquid water input unit, and the hydrogen output unit is spatially connected to the water electrolysis unit; wherein the hydrogen output unit is configured to receive the The hydrogen generated by the water electrolysis unit, and the pressure of the hydrogen is adjusted so that the hydrogen can be maintained at a first predetermined gas pressure; and an oxygen output unit, which is disposed on the water electrolysis unit relative to the liquid The same side of the water input unit, and the oxygen output unit is spatially connected to the water electrolysis unit; wherein the oxygen output unit is configured to receive the oxygen generated by the water electrolysis unit and press the oxygen Adjust so that the oxygen can be maintained at a second predetermined gas pressure. The high-pressure water electrolysis system according to claim 1, wherein the predetermined water pressure set by the liquid water input unit is not less than the first predetermined gas pressure set by the hydrogen output unit and is not less than The second predetermined gas pressure set by the oxygen output unit; wherein the absolute value of the difference between the predetermined water pressure and the first predetermined gas pressure is not greater than 10 bar, and the predetermined water pressure is The absolute value of the difference of the second predetermined gas pressure is not more than 10 bar. The high-pressure water electrolysis system according to claim 1, wherein the liquid water input unit includes: a liquid water supply device; a liquid water input pipeline; wherein the liquid water supply device is configured to pass through the liquid water An input pipeline transports the liquid water to the water electrolysis unit; and a liquid water pressurizing device arranged on the water flow path of the liquid water input pipeline; wherein the liquid water pressurizing device is configured The liquid water circulating in the liquid water input pipeline is pressurized, so that the liquid water is pressurized to the predetermined water pressure, and the pressurized liquid water can continue to pass through the Liquid water is fed into the pipeline to be transported to the water electrolysis unit; wherein the predetermined water pressure is between 150 bar and 350 bar. The high-pressure water electrolysis system according to claim 1, wherein the hydrogen output unit includes: a hydrogen storage device; a hydrogen output pipeline, and the hydrogen storage device is configured to receive and store the hydrogen through the hydrogen output pipeline The hydrogen produced by the reaction of the electrolysis unit; and a first gas pressure adjusting device, which is arranged on the gas flow path of the hydrogen output pipe; wherein the first gas pressure adjusting device is configured to circulate in the hydrogen output pipe oppositely The pressure of the hydrogen in the circuit is adjusted so that the hydrogen can be maintained at the first predetermined gas pressure, and the hydrogen with the first predetermined gas pressure can be continuously input through the hydrogen output pipeline and stored in the The hydrogen storage device; wherein the first predetermined gas pressure is between 150 bar and 350 bar. The high-pressure water electrolysis system according to claim 4, wherein the oxygen output unit includes: an oxygen storage device; An oxygen output pipeline, the oxygen storage device is configured to receive and store the oxygen generated by the reaction of the electrolysis unit through the oxygen output pipeline; and a second gas pressure adjusting device is arranged on the oxygen output pipeline The gas flow path; wherein the second gas pressure adjustment device is configured to adjust the pressure of the oxygen circulating in the oxygen output pipeline, so that the oxygen can be maintained at the second predetermined gas pressure, and has all The oxygen at the second predetermined gas pressure can be continuously input through the oxygen output pipeline and stored in the oxygen storage device; wherein, the second predetermined gas pressure is between 150 bar and 350 bar. The high-pressure water electrolysis system according to claim 1, wherein the water electrolysis unit further includes an anode end plate and a cathode end plate, and the anode end plate and the cathode end plate are respectively disposed on the membrane electrode assembly Wherein, the water electrolysis unit can pass through the anode end plate and the cathode end plate to clamp the membrane electrode assembly in a fixed manner by winding a wire. The high-pressure water electrolysis system according to claim 6, wherein the side surface of the anode end plate away from the membrane electrode group is an arc-shaped surface, and the arc-shaped surface faces in a direction away from the membrane electrode group The anode end plate has a plurality of arc-shaped grooves concavely formed from the arc-shaped surface of the anode end plate, and the plurality of arc-shaped grooves are spaced apart from each other. The high-pressure water electrolysis system according to claim 7, wherein the side surface of the cathode end plate away from the membrane electrode group is an arc-shaped surface, and the arc-shaped surface of the cathode end plate faces away from The direction of the membrane electrode group is convex; wherein, the arc-shaped surface of the anode end plate and the arc-shaped surface of the cathode end plate are convex in a direction away from each other, and are opposite to the membrane electrode The group is set up in a mirror image. The high-pressure water electrolysis system according to claim 8, wherein the cathode end plate has a plurality of arc-shaped grooves recessed inward from its arc-shaped surface, and a plurality of the arcs The arc-shaped grooves are arranged at intervals from each other; wherein the plurality of arc-shaped grooves of the anode end plate and the plurality of arc-shaped grooves of the cathode end plate correspond to each other in position and quantity. The high-pressure water electrolysis system according to claim 9, wherein the arc-shaped grooves of the anode end plate and the arc-shaped grooves of the cathode end plate can be matched with each other to provide at least A binding wire is wound on the plurality of arc-shaped grooves.

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