Hydrogen production system

Abstract

The application discloses a hydrogen production system, which comprises a liquid supply mechanism and an electrolytic hydrogen production assembly. The liquid supply mechanism comprises a liquid inlet channel, a liquid storage tank and a liquid outlet channel, and the liquid inlet channel and the liquid outlet channel are both communicated with the liquid storage tank. The electrolytic hydrogen production assembly comprises an electrolytic stack, a hydrogen outlet channel and a backflow channel, the hydrogen outlet channel is communicated with the electrolytic stack, the liquid inlet channel is communicated with the electrolytic stack, and the backflow channel is communicated between the electrolytic stack and the liquid storage tank. In the projection of the liquid storage tank in the height direction, the flow direction of the backflow channel near one end of the liquid storage tank intersects or is opposite to the flow direction of the liquid outlet channel near one end of the liquid storage tank. The hydrogen production system solves the problem of poor mixing effect of the electrolyte backflowing to the liquid storage tank and the electrolyte in the liquid storage tank in the prior art.

Description

Technical Field

[0001] This application relates to the field of hydrogen production technology, and more specifically, to a hydrogen production system. Background Technology

[0002] Existing electrolytic hydrogen production technologies include solid polymer anion exchange membrane electrolysis (AEM) technology. AEM is usually implemented using a hydrogen production system, which typically includes an electrolytic stack. Hydrogen is produced by transporting electrolyte into the electrolytic stack and decomposing the electrolyte into hydrogen and oxygen within the stack.

[0003] The hydrogen production system also includes a storage tank, an outlet channel, and a return channel. Both the outlet and return channels are connected between the storage tank and the electrolytic cell stack. The outlet channel transports the electrolyte from the storage tank to the electrolytic cell stack, while the return channel transports the electrolyte from the electrolytic cell stack, along with oxygen, back to the storage tank. However, the arrangement of the outlet and return channels results in poor mixing between the electrolyte returning to the storage tank and the electrolyte already in the tank. Utility Model Content

[0004] The main objective of this application is to provide a hydrogen production system that at least solves the problem of poor mixing between the electrolyte returned to the storage tank and the electrolyte in the storage tank in the prior art.

[0005] According to one aspect of this application, a hydrogen production system is provided, the hydrogen production system comprising:

[0006] A liquid supply mechanism, comprising an inlet channel, a storage tank, and an outlet channel, wherein the inlet channel and the outlet channel are both connected to the storage tank;

[0007] An electrolytic hydrogen production assembly, comprising an electrolytic stack, a hydrogen outlet channel, and a reflux channel, wherein the hydrogen outlet channel is connected to the electrolytic stack, the liquid inlet channel is connected to the electrolytic stack, and the reflux channel is connected between the electrolytic stack and the liquid storage tank;

[0008] Specifically, within the projection along the height of the storage tank, the flow direction of the reflux channel near the end of the storage tank intersects with or is opposite to the flow direction of the outlet channel near the end of the storage tank.

[0009] Furthermore, in the height direction of the liquid storage tank, the end of the reflux channel near the liquid storage tank and the end of the liquid outlet channel near the liquid storage tank are at the same height or at different heights.

[0010] Furthermore, the liquid storage tank is provided with a cylindrical receiving cavity, and the liquid outlet channel, the liquid return channel and the liquid inlet channel are all connected to the cylindrical receiving cavity. The end of the liquid return channel near the liquid storage tank is tangent to the inner wall of the cylindrical receiving cavity, and the end of the liquid outlet channel near the liquid storage tank is tangent to the inner wall of the cylindrical receiving cavity.

[0011] Furthermore, the storage tank is provided with an outlet and a return port. The outlet is connected to the outlet channel, and the return port is connected to the return channel. The return port is located at the top of the outlet.

[0012] Furthermore, the liquid supply mechanism also includes a detection component and a controller. The detection component is disposed in the liquid storage tank, and the detection component and the controller are electrically connected. The detection component is used at least to detect whether the electrolyte in the liquid storage tank submerges the return port.

[0013] The liquid supply mechanism also includes a switching valve, which is disposed in the liquid inlet channel and electrically connected to the controller. The controller controls the switching valve to open or close according to the signal transmitted by the detection component.

[0014] Furthermore, the storage tank is provided with a first pipe and a second pipe, the first end of the first pipe being connected to the top of the storage tank, and the first end of the second pipe being connected to the bottom of the storage tank. The detection component includes:

[0015] A first pressure detection element is disposed at the second end of the first pipe to detect the pressure inside the first pipe.

[0016] The second pressure detection element is disposed at the second end of the second pipe to detect the pressure inside the second pipe;

[0017] The calculation module is electrically connected to the first pressure detection device, the second pressure detection device, and the controller. The calculation module calculates the difference between the liquid level of the electrolyte in the storage tank and the height of the reflux port based on the signals transmitted by the first pressure detection device, the signals transmitted by the second pressure detection device, the height from the first end of the second pipeline to the bottom of the storage tank, and the height from the reflux port to the bottom of the storage tank. The controller controls the opening or closing of the switch valve based on the difference between the liquid level of the electrolyte in the storage tank and the height of the reflux port.

[0018] Furthermore, the liquid supply mechanism also includes a plugging component;

[0019] The liquid outlet includes multiple outlets, which are spaced apart along the circumferential and / or height direction of the storage tank. The liquid outlet channel is detachably connected to one of the multiple outlets, and the plug is detachably connected to the remaining outlets that are not connected to the liquid outlet channel; and / or,

[0020] The reflux ports include multiple ports, which are spaced apart along the circumferential and / or height directions of the liquid storage tank. The reflux channel is detachably connected to one of the multiple reflux ports, and the plug is detachably connected to the remaining reflux ports that are not connected to the reflux channel.

[0021] Furthermore, along the height direction of the liquid storage tank, the vertical distance L1 between the reflux port and the outlet and the maximum height L of the liquid storage tank satisfy the following relationship: 0.364≤L1 / L≤0.600.

[0022] Furthermore, within the projection along the height direction of the storage tank, the angle A between the end of the reflux channel near the storage tank and the end of the outlet channel near the storage tank satisfies the following relationship: 30°≤A≤150°.

[0023] Furthermore, the liquid supply mechanism also includes an oxygen venting channel, which is connected to the top of the liquid storage tank.

[0024] Compared to existing technologies, in this application, within the projection along the height of the storage tank, the flow direction of the reflux channel near the storage tank end intersects or is opposite to the flow direction of the outlet channel near the storage tank end. That is, the electrolyte flowing into the storage tank through the reflux channel comes into contact with the electrolyte in the storage tank and flows through a certain angle before exiting the storage tank through the outlet channel. This allows the electrolyte flowing into the storage tank through the reflux channel sufficient time to mix with the electrolyte in the storage tank, thereby improving the mixing effect of the electrolyte. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0026] Figure 1 This is a schematic diagram of the hydrogen production system disclosed in this application;

[0027] Figure 2 This is a schematic diagram of the liquid supply mechanism and return channel disclosed in this application from a first-view perspective.

[0028] Figure 3This is a schematic diagram of the liquid supply mechanism and return channel disclosed in this application from a second-view perspective.

[0029] Figure 4 This is a simplified cross-sectional view of the first type of liquid storage tank disclosed in this application;

[0030] Figure 5 This is a simplified cross-sectional view of the second type of liquid storage tank disclosed in this application;

[0031] Figure 6 This is a simplified cross-sectional view of the third type of liquid storage tank disclosed in this application.

[0032] The above figures include the following reference numerals:

[0033] 11. Liquid inlet channel; 12. Storage tank; 13. Liquid outlet channel; 14. Oxygen exhaust channel; 15. First pipeline; 16. Second pipeline; 17. Liquid discharge channel; 21. Electrolytic cell stack; 22. Hydrogen outlet channel; 23. Reflux channel; 30. Detection component; 31. Calculation module; 32. First pressure detection element; 33. Second pressure detection element; 121. Cylindrical cavity; 122. Reflux port; 123. Liquid outlet; 124. Redundancy area. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0036] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0037] See Figures 1 to 6 As shown, according to an embodiment of this application, a hydrogen production system is provided, which includes a liquid supply mechanism and an electrolysis hydrogen production component.

[0038] The liquid supply mechanism includes an inlet channel 11, a storage tank 12, and an outlet channel 13, both of which are connected to the storage tank 12. The electrolytic hydrogen production assembly includes an electrolytic cell stack 21, a hydrogen outlet channel 22, and a reflux channel 23. The hydrogen outlet channel 22 is connected to the electrolytic cell stack 21, the inlet channel 11 is connected to the electrolytic cell stack 21, and the reflux channel 23 connects the electrolytic cell stack 21 and the storage tank 12. Within the projection of the storage tank 12 along its height, the flow direction of the reflux channel 23 near the storage tank 12 intersects with or is opposite to the flow direction of the outlet channel 13 near the storage tank 12.

[0039] The hydrogen production process of the hydrogen production system is as follows: Water enters the storage tank 12 through the inlet channel 11, and then mixes with the catalyst in the storage tank 12 to form an electrolyte. The electrolyte flows into the electrolytic stack 21 through the outlet channel 13. The electrolytic stack 21 electrolyzes part of the electrolyte into hydrogen and oxygen. The hydrogen is transported through the hydrogen outlet channel 22, while the oxygen and the remaining electrolyte flow back into the storage tank 12 through the return channel 23. In a conventional layout, because the flow direction of the return channel 23 near the storage tank 12 is the same as the flow direction of the outlet channel 13 near the storage tank 12 within the projection of the storage tank 12's height, the electrolyte returning to the storage tank 12 may not be mixed evenly with the electrolyte in the storage tank 12 and flows out through the outlet channel 13. This results in a lower conductivity of the electrolyte flowing into the electrolytic stack 21, thereby reducing the hydrogen production efficiency of the hydrogen production system.

[0040] In this embodiment, within the projection along the height of the storage tank 12, the flow direction of the reflux channel 23 near the storage tank 12 intersects or is opposite to the flow direction of the outlet channel 13 near the storage tank 12. That is, the electrolyte flowing into the storage tank 12 through the reflux channel 23 comes into contact with the electrolyte in the storage tank 12 and flows through a certain angle before exiting the storage tank 12 through the outlet channel 13. This allows the electrolyte flowing into the storage tank 12 through the reflux channel 23 sufficient time to mix with the electrolyte in the storage tank 12, thereby improving the mixing effect of the electrolyte.

[0041] In some embodiments, along the height direction of the storage tank 12, the end of the return channel 23 near the storage tank 12 and the end of the outlet channel 13 near the storage tank 12 are at the same height or at different heights.

[0042] Understandably, in the height direction of the storage tank 12, when the end of the reflux channel 23 near the storage tank 12 is higher than the end of the outlet channel 13 near the storage tank 12, the electrolyte flowing back into the storage tank 12 will be fully mixed with the electrolyte in the storage tank 12 under the action of gravity before flowing out through the outlet channel 13. Conversely, when the end of the reflux channel 23 near the storage tank 12 is lower than the end of the outlet channel 13 near the storage tank 12, the refluxed electrolyte needs to rise to the height of the outlet channel 13 first, during which it will naturally mix fully with the electrolyte in the tank, thus ensuring the conductivity of the electrolyte flowing out of the outlet channel 13. When the end of the reflux channel 23 near the storage tank 12 and the end of the outlet channel 13 near the storage tank 12 are on the same plane, since the flow directions of the reflux channel 23 and the outlet channel 13 are opposite or intersecting, the electrolyte flowing back to the storage tank 12 can also mix with the electrolyte in the storage tank 12 before flowing into the outlet channel 13.

[0043] Furthermore, a cylindrical receiving cavity 121 is provided inside the liquid storage tank 12. The liquid outlet channel 13, the return channel 23 and the liquid inlet channel 11 are all connected to the cylindrical receiving cavity 121. The end of the return channel 23 near the liquid storage tank 12 is tangent to the inner wall of the cylindrical receiving cavity 121, and the end of the liquid outlet channel 13 near the liquid storage tank 12 is tangent to the inner wall of the cylindrical receiving cavity 121.

[0044] Specifically, when the end of the return channel 23 near the storage tank 12 is tangent to the inner wall of the cylindrical cavity 121, and the end of the outlet channel 13 near the storage tank 12 is tangent to the inner wall of the cylindrical cavity 121, the electrolyte returning to the cylindrical cavity 121 flows tangentially to the storage tank 12 from the inner wall of the cylindrical cavity 121. After flowing along the inner wall of the cylindrical cavity 121, it drives the electrolyte in the cylindrical cavity 121 to move, causing the electrolyte in the cylindrical cavity 121 to swirl, thereby improving the mixing effect of the electrolyte returning to the cylindrical cavity 121 and the electrolyte in the storage tank 12. In some embodiments, a spherical cavity may also be provided inside the storage tank 12.

[0045] In addition, the storage tank 12 is provided with an outlet 123 and a return port 122. The outlet 123 is connected to the outlet channel 13, and the return port 122 is connected to the return channel 23. The return port 122 is located on top of the outlet 123.

[0046] Specifically, the electrolyte in the reflux channel 23 flows into the storage tank 12 after passing through the reflux port 122. Since the reflux port 122 is located at the top of the outlet port 123, the electrolyte returning to the storage tank 12 can be fully mixed with the electrolyte in the storage tank 12 before flowing into the outlet channel 13 through the outlet port 123, ensuring the conductivity of the electrolyte flowing into the outlet channel 13. At the same time, since the electrolyte after electrolysis may contain a lot of impurities, the reflux port 122 being located at the top of the outlet port 123 allows the electrolyte returning to the storage tank 12 to have a certain amount of time to settle, thereby depositing the impurities in the electrolyte at the bottom of the storage tank 12.

[0047] In some embodiments, the liquid supply mechanism further includes a detection component 30 and a controller. The detection component 30 is disposed in the liquid storage tank 12 and is electrically connected to the controller. The detection component 30 is used at least to detect whether the electrolyte in the liquid storage tank 12 has submerged the return port 122. The liquid supply mechanism also includes a switching valve, which is disposed in the liquid inlet channel 11 and is electrically connected to the controller. The controller controls the switching valve to open or close according to the signal transmitted by the detection component 30.

[0048] Specifically, when the detection component 30 detects that the electrolyte level in the storage tank 12 has submerged the return port 122, the detection component 30 sends a first electrical signal to the controller. At this time, the controller closes the switch valve to prevent water from entering the storage tank 12. When the detection component 30 detects that the electrolyte level in the storage tank 12 is lower than the return port 122, the detection component 30 sends a second electrical signal to the controller. The controller then opens the switch valve, allowing water to enter the storage tank 12 through the inlet channel 11. It is understandable that since the return channel 23 not only returns the electrolyzed electrolyte to the storage tank 12 but also returns oxygen, if the electrolyte level in the storage tank 12 submerges the return port 122, the oxygen returning to the storage tank 12 will easily dissolve in the electrolyte, thus affecting the electrolysis effect of the hydrogen production system. Meanwhile, it is understood that the electrolytic cell stack 21 consumes electrolyte, therefore the amount of electrolyte entering the electrolytic cell stack 21 is always higher than the amount flowing out of the electrolytic cell stack 21. To prevent excessive oxygen from dissolving in the electrolyte in the storage tank 12, this application requires controlling the water inflow into the storage tank 12. When the electrolyte level in the storage tank 12 submerges the return port 122, the switch valve needs to be switched to the closed state in a timely manner to prevent water from continuing to enter the storage tank 12, thus ensuring that the electrolyte level in the storage tank 12 is lower than the return port 122. When the electrolyte level in the storage tank 12 is too low, water needs to be added to the storage tank 12, at which point the controller will then control the switch valve to be in the open state.

[0049] Furthermore, the storage tank 12 is provided with a first pipe 15 and a second pipe 16. The first end of the first pipe 15 is connected to the top of the storage tank 12, and the first end of the second pipe 16 is connected to the bottom of the storage tank 12. The detection component 30 includes a first pressure detection element 32, a second pressure detection element 33, and a calculation module 31. The first pressure detection element 32 is disposed at the second end of the first pipe 15 to detect the pressure within the first pipe 15, and the second pressure detection element 33 is disposed at the second end of the second pipe 16 to detect the pressure within the second pipe 16. The calculation module 31 is electrically connected to the first pressure detection element 32, the second pressure detection element 33, and the controller. The calculation module 31 calculates the difference between the liquid level of the electrolyte in the storage tank 12 and the height of the reflux port 122 based on the signals transmitted by the first pressure detection element 32, the signals transmitted by the second pressure detection element 33, the height from the first end of the second pipeline 16 to the bottom of the storage tank 12, and the height from the reflux port 122 to the bottom of the storage tank 12. The controller controls the opening or closing of the switch valve based on the difference between the liquid level of the electrolyte in the storage tank 12 and the height of the reflux port 122.

[0050] Specifically, the first pressure detection component is used to detect the pressure of the gas above the electrolyte surface, the second pressure detection component is used to detect the pressure between the second pipe 16 and the electrolyte, and the calculation module 31 is used to calculate the height difference based on the pressure difference, that is, using the liquid pressure formula P = ρgh (ρ is the density of the electrolyte, g is the acceleration due to gravity, and h is the height difference between the detected pressures), that is, the height difference between the first end of the second pipe 16 and the electrolyte surface is:

[0051] h1 = (P1 - P0) / (ρ * g), where P1 is the pressure detected by the second pressure sensor 33, and P0 is the pressure detected by the first pressure sensor 32, i.e., P0 is the pressure of the oxygen and air mixture. Meanwhile, since the heights from the first end of the second pipe 16 to the bottom of the storage tank 12 and from the return port 122 to the bottom of the storage tank 12 are known distances, the difference between the electrolyte level and the height of the return port 122 can be calculated. When the difference between the electrolyte level and the height of the return port 122 is positive, it indicates that the electrolyte has submerged the return port 122, and the controller closes the valve; conversely, when the difference is negative, it indicates that the electrolyte level is lower than the return port 122, and the controller opens the valve. In some embodiments, the height from the first end of the second pipe 16 to the bottom of the storage tank 12 refers to the height from the first end of the second pipe 16 to the bottom of the cylindrical accommodating cavity 121. Similarly, the height from the reflux port 122 to the bottom of the storage tank 12 refers to the height from the reflux port 122 to the bottom of the cylindrical accommodating cavity 121.

[0052] Furthermore, the liquid supply mechanism also includes a blocking component; the liquid outlet 123 includes multiple outlets 123, which are spaced apart along the circumferential direction and / or height direction of the liquid storage tank 12, the liquid outlet channel 13 is detachably connected to one of the multiple outlets 123, and the blocking component is detachably connected to the remaining outlets 123 that are not connected to the liquid outlet channel 13.

[0053] It should be noted that "multiple liquid outlets 123 are spaced apart along the circumferential and / or vertical directions of the storage tank 12" refers to one of the following: multiple liquid outlets 123 are spaced apart along the circumferential direction of the storage tank 12; multiple liquid outlets 123 are spaced apart along the vertical direction of the storage tank 12; or multiple liquid outlets 123 are spaced apart both along the circumferential and vertical directions of the storage tank 12. In this embodiment, by setting multiple liquid outlets 123, the installation position of the liquid outlet channel 13 can be adjusted according to the installation position of the storage tank 12 and the installation positions of other components in the hydrogen production system, thereby improving the adaptability and space utilization of the hydrogen production equipment and avoiding interference between the liquid outlet channel 13 and other components of the previous system.

[0054] Optionally, the reflux port 122 includes multiple reflux ports 122, which are spaced apart along the circumferential direction and / or height direction of the liquid storage tank 12. The reflux channel 23 is detachably connected to one of the multiple reflux ports 122, and multiple plugs are detachably connected to the remaining reflux ports 122 that are not connected to the reflux channel 23.

[0055] Similarly, the connection position between the reflux channel 23 and the storage tank 12 can be changed according to the installation position of the storage tank 12 or the installation position of other components in the hydrogen production system, thereby improving the space utilization and adaptability of the hydrogen production system to a certain extent.

[0056] Furthermore, along the height direction of the storage tank 12, the vertical distance L1 between the return port 122 and the outlet 123 satisfies the relationship between the maximum height L of the storage tank 12 and the formula: 0.364≤L1 / L≤0.600.

[0057] In this embodiment, when the ratio of L1 to L satisfies the above-mentioned relationship, the vertical distance between the reflux port 122 and the outlet port 123 will not be too large, preventing the outlet port 123 from being too close to the bottom of the storage tank 12, and avoiding impurities deposited at the bottom of the outlet port 123 from entering the outlet channel 13. Simultaneously, the vertical distance between the reflux port 122 and the outlet port 123 will not be too low compared to the maximum height of the storage tank 12, resulting in a shorter mixing time between the electrolyte flowing back into the storage tank 12 and the electrolyte in the storage tank 12, thus affecting the hydrogen production efficiency of the hydrogen production system. The value of L1 / L can be 0.364, 0.400, 0.450, 0.500, 0.550, and 0.600. The value of L1 can be 0.8m, 0.9m, 1m, 1.1m, and 1.2m. The value of L can be 2m, 2.05m, 2.1m, 2.15m, and 2.2m.

[0058] Furthermore, within the projection along the height of the storage tank 12, the angle A between the end of the return channel 23 near the storage tank 12 and the end of the outlet channel 13 near the storage tank 12 satisfies the following relationship: 30°≤A≤150°.

[0059] Understandably, when the angle A between the end of the return channel 23 near the storage tank 12 and the end of the outlet channel 13 near the storage tank 12 in the projection along the height direction of the storage tank 12 is less than 30°, the electrolyte returning to the storage tank 12 may not have fully mixed with the electrolyte in the storage tank 12 before flowing into the outlet channel 13. If the angle A is greater than 150°, it will affect the installation position of the outlet channel 13 and the inlet channel 11, potentially reducing the space utilization of the hydrogen production system. An angle between 30° and 150° balances the space utilization of the hydrogen production system while allowing the electrolyte returning to the storage tank 12 to mix sufficiently with the electrolyte in the storage tank 12 to a certain extent. The value of A can be 30°, 40°, 50°, 60°, 70°, 80°, 90°, 100°, 110°, 120°, 130°, 140° and 150°.

[0060] In addition, in some embodiments, the storage tank 12 is also provided with a redundant area 124, which is located at the bottom of the storage tank 12. The redundant area 124 is used to accumulate impurities and debris deposited in the electrolyte. The liquid supply mechanism also includes a drain channel 17, which is used to drain the storage tank 12. The drain channel 17 is connected to the side of the storage tank 12 away from the redundant area 124 to prevent impurities or debris in the redundant area 124 from clogging the drain channel 17.

[0061] Since the return channel 23 needs to guide oxygen into the storage tank 12, to avoid excessive oxygen dissolving in the electrolyte and thus affecting the hydrogen production efficiency of the hydrogen production system, the liquid supply mechanism in this embodiment also includes an oxygen exhaust channel 14, which is connected to the top of the storage tank 12. That is, the oxygen returning to the storage tank 12 can be discharged through the oxygen exhaust channel 14. Of course, a gas storage tank can also be connected to the oxygen exhaust channel 14 to collect oxygen.

[0062] In summary, the hydrogen production system of this application improves the mixing effect of the electrolyte returning to the storage tank 12 with the electrolyte in the storage tank 12 by ensuring that the flow direction of the reflux channel 23 near the storage tank 12 intersects or is opposite to the flow direction of the outlet channel 13 near the storage tank 12 within the projection along the height direction of the storage tank 12, thereby preventing a decrease in the hydrogen production efficiency of the system. Furthermore, along the height direction of the storage tank 12, the reflux port 122 is located at the top of the outlet port 123, allowing the electrolyte returning to the storage tank 12 to mix thoroughly with the electrolyte in the storage tank 12 under gravity, ensuring the conductivity of the electrolyte flowing into the outlet channel 13. On the other hand, in this application, the end of the reflux channel 23 near the storage tank 12 is tangent to the inner wall of the cylindrical cavity 121, and the end of the outlet channel 13 near the storage tank 12 is tangent to the inner wall of the cylindrical cavity 121. This arrangement causes the electrolyte flowing back into the cylindrical cavity 121 to generate a swirling flow, thereby ensuring thorough mixing of the electrolyte. Furthermore, this application also includes a detection component 30, a controller, and a switching valve. By detecting whether the electrolyte submerges the reflux port 122, excessive oxygen dissolves in the electrolyte, thus preventing it from affecting the hydrogen production efficiency of the hydrogen production system.

[0063] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0064] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0065] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A hydrogen production system, characterized in that, include: The liquid supply mechanism includes an inlet channel (11), a storage tank (12), and an outlet channel (13), both of which are connected to the storage tank (12). An electrolytic hydrogen production assembly, comprising an electrolytic stack (21), a hydrogen outlet channel (22), and a reflux channel (23), wherein the hydrogen outlet channel (22) is connected to the electrolytic stack (21), the liquid inlet channel (11) is connected to the electrolytic stack (21), and the reflux channel (23) is connected between the electrolytic stack (21) and the liquid storage tank (12); In the projection of the liquid storage tank (12) in the height direction, the flow direction of the return channel (23) near the end of the liquid storage tank (12) intersects or is opposite to the flow direction of the liquid outlet channel (13) near the end of the liquid storage tank (12).

2. The hydrogen production system according to claim 1, characterized in that, In the height direction of the liquid storage tank (12), the end of the return channel (23) near the liquid storage tank (12) and the end of the outlet channel (13) near the liquid storage tank (12) are at the same height or at different heights.

3. The hydrogen production system according to claim 1, characterized in that, The storage tank (12) is provided with a cylindrical receiving cavity (121). The liquid outlet channel (13), the return channel (23) and the liquid inlet channel (11) are all connected to the cylindrical receiving cavity (121). The end of the return channel (23) near the storage tank (12) is tangent to the inner wall of the cylindrical receiving cavity (121), and the end of the liquid outlet channel (13) near the storage tank (12) is tangent to the inner wall of the cylindrical receiving cavity (121).

4. The hydrogen production system according to claim 1, characterized in that, The storage tank (12) is provided with an outlet (123) and a return port (122). The outlet (123) is connected to the outlet channel (13), and the return port (122) is connected to the return channel (23). The return port (122) is located at the top of the outlet (123).

5. The hydrogen production system according to claim 4, characterized in that, The liquid supply mechanism also includes a detection component (30) and a controller. The detection component (30) is disposed in the liquid storage tank (12). The detection component (30) and the controller are electrically connected. The detection component (30) is used at least to detect whether the electrolyte in the liquid storage tank (12) submerges the return port (122). The liquid supply mechanism also includes a switching valve, which is disposed in the liquid inlet channel (11). The switching valve is electrically connected to the controller, which controls the switching valve to open or close according to the signal transmitted by the detection component (30).

6. The hydrogen production system according to claim 5, characterized in that, The storage tank (12) is provided with a first pipe (15) and a second pipe (16). The first end of the first pipe (15) is connected to the top of the storage tank (12), and the first end of the second pipe (16) is connected to the bottom of the storage tank (12). The detection component (30) includes: The first pressure detection element (32) is disposed at the second end of the first pipe (15) to detect the pressure inside the first pipe (15); The second pressure detection component (33), the second pressure detection component (33) is arranged at the second end of the second pipeline (16) for detecting the pressure in the second pipeline (16); A calculation module (31), the calculation module (31) is electrically connected to the first pressure detection component (32), the second pressure detection component (33) and the controller respectively. The calculation module (31) calculates the difference between the liquid level height of the electrolyte in the liquid storage tank (12) and the height of the reflux port (122) according to the signals transmitted by the first pressure detection component (32), the signals transmitted by the second pressure detection component (33), the height from the first end of the second pipeline (16) to the bottom of the liquid storage tank (12), and the height from the reflux port (122) to the bottom of the liquid storage tank (12). The controller controls the opening or closing of the switching valve according to the difference between the liquid level height of the electrolyte in the liquid storage tank (12) and the height of the reflux port (122).

7. The hydrogen production system according to claim 4, characterized in that, The liquid supply mechanism further includes a plugging component; The liquid outlet (123) includes a plurality of them, and the plurality of liquid outlets (123) are arranged at intervals along the circumferential direction and / or the height direction of the liquid storage tank (12). The liquid outlet channel (13) is detachably communicated with one of the plurality of liquid outlets (123), and the plugging component is detachably connected in the other liquid outlets (123) that are not communicated with the liquid outlet channel (13); and / or, The reflux port (122) includes a plurality of them, and the plurality of reflux ports (122) are arranged at intervals along the circumferential direction and / or the height direction of the liquid storage tank (12). The reflux channel (23) is detachably communicated with one of the plurality of reflux ports (122), and the plugging component is detachably connected in the other reflux ports (122) that are not communicated with the reflux channel (23).

8. The hydrogen production system according to claim 4, characterized in that, Along the height direction of the liquid storage tank (12), the vertical distance L1 between the reflux port (122) and the liquid outlet (123) satisfies the relationship: 0.364 ≤ L1 / L ≤ 0.600 with respect to the maximum height L of the liquid storage tank (12).

9. The hydrogen production system according to any one of claims 1 to 8, characterized in that, Within the projection in the height direction of the liquid storage tank (12), the included angle A between the end of the reflux channel (23) close to the liquid storage tank (12) and the end of the liquid outlet channel (13) close to the liquid storage tank (12) satisfies the relationship: 30° ≤ A ≤ 150°.

10. The hydrogen production system according to any one of claims 1 to 8, characterized in that, The liquid supply mechanism further includes an oxygen discharge channel (14), and the oxygen discharge channel (14) is communicated with the top of the liquid storage tank (12).

Images