Electrolytic hydrogen production system and container building module

Abstract

An electrolytic hydrogen production system and a container building module. The electrolytic hydrogen production system comprises an electrolytic tank, a hydrogen side gas-liquid separator, an oxygen side gas-liquid separator and a liquid supplementing pump. The electrolytic tank is used for electrolyzing water into hydrogen and oxygen, and the electrolytic tank is provided with a hydrogen side outlet and an oxygen side outlet. The hydrogen side gas-liquid separator is communicated with the hydrogen side outlet; the hydrogen side gas-liquid separator is also provided with a first liquid discharge port; the oxygen side gas-liquid separator is communicated with the oxygen side outlet, and the oxygen side gas-liquid separator is further provided with a second liquid discharge port. One end of the liquid supplementing pump is communicated with the first liquid outlet and / or the second liquid outlet, and the other end of the liquid supplementing pump is communicated with the hydrogen side outlet and / or the oxygen side outlet. And the liquid supplementing pump is used for conveying liquid in the hydrogen side gas-liquid separator and / or the oxygen side gas-liquid separator to the hydrogen side outlet and / or the oxygen side outlet when the electrolytic tank is shut down, so that the liquid flows back to the electrolytic tank. According to the electrolytic hydrogen production system, gas on the hydrogen side and gas on the oxygen side of the electrolytic tank can be prevented from penetrating and mixing.

Description

Technical Field

[0001] This utility model relates to the field of electrolytic hydrogen production technology, and more specifically to an electrolytic hydrogen production system and a container building module. Background Technology

[0002] In an electrolytic hydrogen production system, hydrogen and oxygen are generated at the cathode and anode sides of the electrolytic cell, respectively, resulting in an electrolyte that is a gas-liquid mixture containing bubbles. The electrolyte and gas mixtures on the hydrogen and oxygen sides of the electrolytic cell respectively enter the hydrogen-side gas-liquid separator and the oxygen-side gas-liquid separator, where gas-liquid separation is achieved by utilizing the natural sedimentation of the electrolyte.

[0003] When water electrolysis stops, the electrolyte stops flowing due to the shutdown of the circulating pump, which may expose the diaphragm of the electrolytic cell to the gas. In this case, there is a possibility that the gases on both sides of the hydrogen and oxygen can penetrate each other, which can lead to a decrease in gas purity and, in more serious cases, cause an explosion.

[0004] Therefore, an electrolysis hydrogen production system and container building modules are needed to at least partially solve the above problems. Utility Model Content

[0005] The utility model description section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This utility model description section is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] To at least partially solve the above problems, a first aspect of this utility model provides an electrolytic hydrogen production system, the electrolytic hydrogen production system comprising:

[0007] An electrolytic cell for electrolyzing water into hydrogen and oxygen, the electrolytic cell having a hydrogen-side outlet and an oxygen-side outlet;

[0008] A hydrogen-side gas-liquid separator, wherein the hydrogen-side gas-liquid separator is connected to the hydrogen-side outlet, and the hydrogen-side gas-liquid separator further has a first liquid outlet;

[0009] An oxygen-side gas-liquid separator is connected to an oxygen-side outlet and also has a second liquid outlet.

[0010] A replenishment pump, one end of which is connected to the first liquid outlet and / or the second liquid outlet, and the other end of which is connected to the hydrogen side outlet and / or the oxygen side outlet;

[0011] The replenishment pump is used to deliver liquid from the hydrogen-side gas-liquid separator and / or the oxygen-side gas-liquid separator to the hydrogen-side outlet and / or the oxygen-side outlet when the electrolytic cell is shut down, so that the liquid flows back into the electrolytic cell.

[0012] According to the electrolytic hydrogen production system of this application, a replenishment pump is used to return liquid to the electrolytic cell after the system is shut down, thereby liquid-sealing the diaphragm in the electrolytic cell and preventing gas mixing between the hydrogen and oxygen sides. Furthermore, in this electrolytic hydrogen production system, the replenishment pump directly replenishes liquid from the hydrogen-side outlet and / or the oxygen-side outlet, eliminating the need to design a gas-liquid separator with an installation height higher than the electrolytic cell to facilitate liquid return. This allows for more flexible design and layout, avoiding limitations imposed by plant height and transportation dimensions on the electrolytic hydrogen production system.

[0013] Optionally, the electrolysis hydrogen production system further includes:

[0014] A hydrogen-side level gauge, connected to the hydrogen-side outlet, for detecting the liquid level at the hydrogen-side outlet; and / or,

[0015] An oxygen-side level gauge is connected to the oxygen-side outlet to detect the liquid level at the oxygen-side outlet.

[0016] Optionally, the electrolysis hydrogen production system further includes a controller;

[0017] The controller is signal-connected to the electrolytic cell and the replenishment pump;

[0018] The controller is also signal-connected to the hydrogen-side level gauge and / or the oxygen-side level gauge;

[0019] The controller is used to control the replenishment pump to start when the electrolytic cell is shut down, and to control the replenishment pump to stop when the hydrogen-side level gauge and / or the oxygen-side level gauge detects a liquid level signal.

[0020] Optionally, the electrolysis hydrogen production system further includes:

[0021] A hydrogen-side output pipeline, which is connected to the hydrogen-side gas-liquid separator and the hydrogen-side outlet;

[0022] An oxygen-side output pipeline is connected to the oxygen-side gas-liquid separator and the oxygen-side outlet.

[0023] The hydrogen-side level gauge is connected to one end of the hydrogen-side output pipeline near the hydrogen-side outlet, and the replenishment pump is connected to the hydrogen-side output pipeline; and / or,

[0024] The oxygen-side level gauge is connected to one end of the oxygen-side output pipeline near the oxygen-side outlet, and the replenishment pump is connected to the oxygen-side output pipeline.

[0025] Optionally, the hydrogen-side outlet is located at the top of the electrolyzer; and / or,

[0026] The oxygen-side outlet is located at the top of the electrolytic cell.

[0027] Optionally, the first liquid outlet and / or the second liquid outlet are located at a position not higher than the top of the electrolytic cell.

[0028] Optionally, the electrolytic cell has a liquid inlet;

[0029] The electrolytic hydrogen production system also includes a circulation pump, one end of which is connected to the first liquid outlet and the second liquid outlet, and the other end of which is connected to the liquid inlet.

[0030] The circulating pump is used to transport the liquid in the hydrogen-side gas-liquid separator and the oxygen-side gas-liquid separator to the inlet when the electrolytic hydrogen production system is started, so that the liquid flows back to the electrolytic cell.

[0031] Optionally, the electrolysis hydrogen production system further includes:

[0032] A one-way valve is provided between the liquid inlet and the circulation pump, and the one-way valve is used to prevent liquid from flowing from the liquid inlet to the circulation pump.

[0033] Optionally, the electrolytic cell, the hydrogen-side gas-liquid separator, the oxygen-side gas-liquid separator, and the replenishment pump are detachably connected by pipelines.

[0034] A second aspect of this application provides a container building module, the container building module including the electrolysis hydrogen production system described in the first aspect above.

[0035] The container building module according to this utility model has similar technical effects to the container building module described in the first aspect above. Attached Figure Description

[0036] The following drawings, which are incorporated herein by reference as part of this invention, are provided for understanding the invention. The drawings illustrate embodiments of the invention and their descriptions, serving to explain the principles of the invention.

[0037] In the attached image:

[0038] Figure 1 This is a schematic diagram of an electrolytic hydrogen production system according to one embodiment of this application during the start-up of the electrolytic cell, the start-up of the circulating pump, and the shutdown of the replenishment pump.

[0039] Figure 2This is a schematic diagram of an electrolytic hydrogen production system according to one embodiment of this application when the electrolytic cell is shut down, the circulating pump is shut down, and the replenishment pump is started.

[0040] Explanation of reference numerals in the attached figures:

[0041] 100: Electrolysis hydrogen production system; 101: First reflux pipeline

[0042] 102: Second reflux line; 110: Electrolytic cell

[0043] 111: Hydrogen-side outlet; 112: Oxygen-side outlet

[0044] 113: Hydrogen-side level gauge; 114: Oxygen-side level gauge

[0045] 115: Hydrogen-side output pipeline; 116: Oxygen-side output pipeline

[0046] 117: Liquid inlet; 120: Hydrogen-side gas-liquid separator

[0047] 121: First liquid outlet 122: First liquid discharge pipeline

[0048] 130: Oxygen-side gas-liquid separator; 131: Second liquid outlet.

[0049] 132: Second liquid discharge line; 140: Make-up pump

[0050] 141: First replenishment line; 142: Second replenishment line

[0051] 143: First branch road 144: Second branch road

[0052] 150: Circulation pump; 160: Check valve Detailed Implementation

[0053] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0054] 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 the present invention. 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 the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0055] The ordinal numbers such as "first" and "second" used in this invention are merely identifiers and do not have any other meaning, such as a specific order. Furthermore, for example, the term "first component" does not imply the existence of a "second component," and the term "second component" does not imply the existence of a "first component." It should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "inner," "outer," and similar expressions used herein are for illustrative purposes only and are not intended to be limiting.

[0056] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings.

[0057] refer to Figure 1 and Figure 2 The first aspect of this utility model provides an electrolytic hydrogen production system 100. The electrolytic hydrogen production system 100 includes an electrolytic cell 110, a hydrogen-side gas-liquid separator 120, an oxygen-side gas-liquid separator 130, and a makeup pump 140. The electrolytic cell 110 is used to electrolyze water into hydrogen and oxygen, and has a hydrogen-side outlet 111 and an oxygen-side outlet 112. The hydrogen-side gas-liquid separator 120 is connected to the hydrogen-side outlet 111 and also has a first liquid outlet 121. The oxygen-side gas-liquid separator 130 is connected to the oxygen-side outlet 112 and also has a second liquid outlet 131. One end of the makeup pump 140 is connected to the first liquid outlet 121 and / or the second liquid outlet 131, and the other end of the makeup pump 140 is connected to the hydrogen-side outlet 111 and / or the oxygen-side outlet 112. The replenishment pump 140 is used to deliver liquid from the hydrogen-side gas-liquid separator 120 and / or the oxygen-side gas-liquid separator 130 to the hydrogen-side outlet 111 and / or the oxygen-side outlet 112 when the electrolytic cell 110 is shut down, so that the liquid flows back into the electrolytic cell 110.

[0058] According to the electrolytic hydrogen production system 100 of this application, a replenishment pump 140 is used to return liquid to the electrolytic cell 110 after the system is shut down, so that the diaphragm in the electrolytic cell 110 is liquid-sealed, preventing the gases on the hydrogen side and oxygen side from mixing through the diaphragm, thus avoiding a decrease in purity and dangerous situations. Furthermore, in the electrolytic hydrogen production system 100 of this application, the replenishment pump 140 directly replenishes liquid from the hydrogen side outlet 111 and / or the oxygen side outlet 112, eliminating the need to design a gas-liquid separator with an installation height higher than the electrolytic cell to facilitate liquid return. This allows for a more flexible design layout and avoids limitations imposed by plant height and transportation dimensions on the electrolytic hydrogen production system.

[0059] It should be noted that as long as the replenishment pump 140 can return the liquid from at least one of the hydrogen-side gas-liquid separator 120 and the oxygen-side gas-liquid separator 130 to the electrolytic cell 110, thereby liquid-sealing the diaphragm in the electrolytic cell 110, it is sufficient. In other words, there are multiple ways to connect the replenishment pump 140, the hydrogen-side gas-liquid separator 120, the oxygen-side gas-liquid separator 130, and the electrolytic cell 110.

[0060] In this embodiment, one end of the replenishment pump 140 is connected to the first liquid outlet 121 and the second liquid outlet 131, and the other end of the replenishment pump 140 is connected to the hydrogen side outlet 111 and the oxygen side outlet 112.

[0061] As another optional implementation, one end of the replenishment pump 140 is connected to the first liquid outlet 121, and the other end of the replenishment pump 140 is connected to the hydrogen-side outlet 111. Alternatively, one end of the replenishment pump 140 is connected to the second liquid outlet 131, and the other end of the replenishment pump 140 is connected to the oxygen-side outlet 112. Alternatively, one end of the replenishment pump 140 is connected to the first liquid outlet 121, and the other end of the replenishment pump 140 is connected to the oxygen-side outlet 112. Alternatively, one end of the replenishment pump 140 is connected to the second liquid outlet 131, and the other end of the replenishment pump 140 is connected to the hydrogen-side outlet 111. Alternatively, one end of the replenishment pump 140 is connected to the first liquid outlet 121 and the second liquid outlet 131, and the other end of the replenishment pump 140 is connected to the hydrogen-side outlet 111. Alternatively, one end of the replenishment pump 140 is connected to the first liquid outlet 121 and the second liquid outlet 131, and the other end of the replenishment pump 140 is connected to the oxygen-side outlet 112. Alternatively, one end of the replenishment pump 140 is connected to the first liquid outlet 121, and the other end of the replenishment pump 140 is connected to the hydrogen-side outlet 111 and the oxygen-side outlet 112. Alternatively, one end of the replenishment pump 140 is connected to the second liquid outlet 131, and the other end of the replenishment pump 140 is connected to the hydrogen-side outlet 111 and the oxygen-side outlet 112.

[0062] The electrolytic hydrogen production system 100 may also be equipped with a level gauge on at least one side of the electrolytic cell 110, either the hydrogen side or the oxygen side, and a controller to control the start and stop of the replenishment pump 140 based on the liquid level detected by the level gauge. In other words, the electrolytic hydrogen production system 100 may include a hydrogen-side level gauge 113 and / or an oxygen-side level gauge 114, as well as a controller. The hydrogen-side level gauge 113 is connected to the hydrogen-side outlet 111 to detect the liquid level at the hydrogen-side outlet 111. The oxygen-side level gauge 114 is connected to the oxygen-side outlet 112 to detect the liquid level at the oxygen-side outlet 112.

[0063] The controller is signal-connected to the electrolytic cell 110 and the replenishment pump 140. Furthermore, the controller is also signal-connected to the hydrogen-side level gauge 113 and / or the oxygen-side level gauge 114. The controller is used to control the replenishment pump 140 to start when the electrolytic cell 110 is shut down, and to control the replenishment pump 140 to stop when the hydrogen-side level gauge 113 and / or the oxygen-side level gauge 114 detects a liquid level signal. It should be noted that when the electrolytic hydrogen production system 100 has a hydrogen-side level gauge 113, the controller is signal-connected to the hydrogen-side level gauge 113; when the electrolytic hydrogen production system 100 has an oxygen-side level gauge 114, the controller is signal-connected to the oxygen-side level gauge 114.

[0064] In this embodiment, both hydrogen-side level gauge 113 and oxygen-side level gauge 114 are simultaneously configured. When both hydrogen-side level gauge 113 and oxygen-side level gauge 114 detect a liquid level signal, the controller stops the replenishment pump 140. Alternatively, the controller can be configured to stop the replenishment pump 140 only when either hydrogen-side level gauge 113 or oxygen-side level gauge 114 detects a liquid level signal.

[0065] In addition, when the other end of the replenishment pump 140 is connected to both the hydrogen-side outlet 111 and the oxygen-side outlet 112, either the hydrogen-side level gauge 113 or the oxygen-side level gauge 114 can be selected.

[0066] In other alternative embodiments, when the other end of the replenishment pump 140 is connected to either the hydrogen-side outlet 111 or the oxygen-side outlet 112, only the hydrogen-side level gauge 113 or the oxygen-side level gauge 114 may be provided accordingly.

[0067] Continue to refer to Figure 1 and Figure 2 The electrolytic hydrogen production system 100 also includes a circulation pump 150, and the electrolytic cell 110 has a liquid inlet 117. One end of the circulation pump 150 is connected to a first liquid outlet 121 and a second liquid outlet 131, and the other end of the circulation pump 150 is connected to the liquid inlet 117. The circulation pump 150 is used to transport the liquid in the hydrogen-side gas-liquid separator 120 and the oxygen-side gas-liquid separator 130 to the liquid inlet 117 when the electrolytic hydrogen production system 100 is started, so that the liquid flows back to the electrolytic cell 110.

[0068] As an alternative implementation method, continue to refer to Figure 1 and Figure 2 The electrolytic cell 110, hydrogen-side gas-liquid separator 120, oxygen-side gas-liquid separator 130, and replenishment pump 140 are detachably connected via pipelines. Specifically, the electrolytic hydrogen production system 100 also includes a hydrogen-side output pipeline 115 and an oxygen-side output pipeline 116. The hydrogen-side output pipeline 115 is connected to the hydrogen-side gas-liquid separator 120 and the hydrogen-side outlet 111, and the oxygen-side output pipeline 116 is connected to the oxygen-side gas-liquid separator 130 and the oxygen-side outlet 112. The hydrogen-side outlet 111 and the oxygen-side outlet 112 can both be located at the top of the electrolytic cell 110. Furthermore, the hydrogen-side level gauge 113 is connected to the end of the hydrogen-side output pipeline 115 near the hydrogen-side outlet 111, the oxygen-side level gauge 114 is connected to the end of the oxygen-side output pipeline 116 near the oxygen-side outlet 112, the replenishment pump 140 is connected to the hydrogen-side output pipeline 115, and the replenishment pump 140 is connected to the oxygen-side output pipeline 116.

[0069] The electrolytic hydrogen production system 100 also includes a first liquid discharge line 122, a second liquid discharge line 132, a first return line 101, a second return line 102, a first replenishment line 141, a second replenishment line 142, a first branch line 143, and a second branch line 144.

[0070] The first liquid discharge pipe 122 is connected to the first liquid outlet 121, and the first return pipe 101 is connected to the first liquid discharge pipe 122. The second liquid discharge pipe 132 is connected to the second liquid outlet 131, and the first return pipe 101 is connected to the second liquid discharge pipe 132. Furthermore, the first return pipe 101 is connected to the inlet of the circulation pump 150, and the second return pipe 102 is connected to the outlet of the circulation pump 150. The second return pipe 102 is also connected to the liquid inlet 117 of the electrolytic cell 110. Preferably, the electrolytic cell 110 has two liquid inlets 117, corresponding to the hydrogen side and the oxygen side respectively. The second return pipe 102 is connected to both the hydrogen-side and oxygen-side liquid inlets 117 via two branches. A one-way valve 160 is installed in the second return pipe 102.

[0071] The first replenishment line 141 is connected to the first return line 101 and also to the inlet of the replenishment pump 140. The second replenishment line 142 is connected to the outlet of the replenishment pump 140. Furthermore, the first branch line 143 and the second branch line 144 are both connected to the second replenishment line 142. The first branch line 143 is also connected to the hydrogen-side level gauge 113, and the second branch line 144 is also connected to the oxygen-side level gauge 114.

[0072] It's worth noting that existing alkaline water electrolysis hydrogen production systems are mostly designed with two or more layers. For example, the electrolysis cell is designed on the first layer, while the hydrogen-side gas-liquid separator and oxygen-side gas-liquid separator are located on the second layer. When water electrolysis stops, the alkaline solution is returned by gravity, ensuring that the electrolysis cell is full of electrolyte and preventing the diaphragm from being exposed to gas. However, as the hydrogen production capacity of electrolysis hydrogen production equipment increases, the size of the electrolysis cell and gas-liquid separator also increases, and the overall height of the alkaline solution circulation system also increases, making production, manufacturing, and transportation very inconvenient. Due to the limitations of plant height and transportation dimensions, large-scale hydrogen production equipment usually designs the gas-liquid separation and electrolyte circulation system into upper and lower parts. During transportation, the upper and lower layers are separated and then connected on-site, increasing the cost of connectors and labor.

[0073] Therefore, to save design dimensions, reduce overall design height, and avoid limitations imposed by plant height and transportation dimensions on the electrolytic hydrogen production system 100, the locations of the first liquid outlet 121 and / or the second liquid outlet 131 can be set no higher than the top of the electrolytic cell 110. Preferably, the hydrogen-side gas-liquid separator 120 and the oxygen-side gas-liquid separator 130 are located no higher than the electrolytic cell 110. Alternatively, the hydrogen-side gas-liquid separator 120, the oxygen-side gas-liquid separator 130, and the electrolytic cell 110 are arranged on the same floor.

[0074] Furthermore, the electrolytic hydrogen production system 100 also includes a one-way valve 160 disposed between the inlet 117 and the circulation pump 150. The one-way valve 160 is used to prevent liquid from flowing from the inlet 117 to the circulation pump 150. This arrangement can prevent liquid from flowing out from the bottom after being replenished from the top of the electrolytic cell 110, especially when the first liquid outlet 121 and / or the second liquid outlet 131 are below the electrolytic cell 110.

[0075] When the electrolysis hydrogen production system 100 performs electrolysis, refer to Figure 1When the electrolytic cell 110 operates, it generates gas, the circulation pump 150 starts, and the replenishment pump 140 stops. Under the action of the circulation pump 150, the hydrogen-liquid mixture and the oxygen-liquid mixture in the electrolytic cell 110 are discharged from the hydrogen-side outlet 111 and the oxygen-side outlet 112, respectively. The hydrogen-liquid mixture enters the hydrogen-side output pipeline 115 from the hydrogen-side outlet 111, and then flows into the hydrogen-side gas-liquid separator 120 for gas-liquid separation. The separated liquid enters the first liquid discharge pipeline 122 through the first liquid discharge outlet 121, then flows to the first return pipeline 101, and after passing through the circulation pump 150, it enters the second return pipeline 102. After passing through the one-way valve 160, it returns to the electrolytic cell 110 through the liquid inlet 117. The oxygen-liquid mixture enters the oxygen-side output pipeline 116 from the oxygen-side outlet 112, and then flows into the oxygen-side gas-liquid separator 130 for gas-liquid separation. The separated liquid enters the second liquid discharge pipeline 132 through the second liquid discharge outlet 131, then flows to the first return pipeline 101, and after passing through the circulation pump 150, it enters the second return pipeline 102. After passing through the one-way valve 160, it returns to the electrolytic cell 110 through the liquid inlet 117.

[0076] When the electrolysis hydrogen production system 100 stops electrolysis, refer to Figure 2 Electrolytic cell 110 is shut down, circulation pump 150 is shut down, and replenishment pump 140 is started. The liquid discharged from hydrogen-side gas-liquid separator 120 and oxygen-side gas-liquid separator 130 enters first replenishment pipeline 141 through first liquid discharge pipeline 122 and second liquid discharge pipeline 132, respectively, and then enters second replenishment pipeline 142 through replenishment pump 140. After that, it enters hydrogen-side output pipeline 115 and oxygen-side output pipeline 116 through first branch 143 and second branch 144, respectively, and thus enters electrolytic cell 110.

[0077] A second aspect of this application provides a container building module, which includes the electrolysis hydrogen production system 100 described in the first aspect. The container building module can be a skid.

[0078] The container building module according to this application has similar technical effects to the electrolytic hydrogen production system 100 of the first aspect described above.

[0079] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the scope of the invention. Features described in one embodiment may be applied, alone or in combination with other features, to another embodiment, unless that feature is not applicable in that other embodiment or is otherwise stated.

[0080] This utility model has been described through the above embodiments. However, it should be understood that the above embodiments are only for illustrative purposes. This utility model is not limited to the above embodiments. Many variations and modifications can be made based on the teachings of this utility model, and all such variations and modifications fall within the scope of protection claimed by this utility model.

Claims

1. An electrolytic hydrogen production system, characterized in that, The electrolytic hydrogen production system includes: An electrolytic cell for electrolyzing water into hydrogen and oxygen, the electrolytic cell having a hydrogen-side outlet and an oxygen-side outlet; A hydrogen-side gas-liquid separator, wherein the hydrogen-side gas-liquid separator is connected to the hydrogen-side outlet, and the hydrogen-side gas-liquid separator also has a first liquid outlet; An oxygen-side gas-liquid separator is connected to an oxygen-side outlet and also has a second liquid outlet. A replenishment pump, one end of which is connected to the first liquid outlet and / or the second liquid outlet, and the other end of which is connected to the hydrogen side outlet and / or the oxygen side outlet; The replenishment pump is used to deliver liquid from the hydrogen-side gas-liquid separator and / or the oxygen-side gas-liquid separator to the hydrogen-side outlet and / or the oxygen-side outlet when the electrolytic cell is shut down, so that the liquid flows back into the electrolytic cell.

2. The electrolytic hydrogen production system according to claim 1, characterized in that, The electrolytic hydrogen production system also includes: A hydrogen-side level gauge, connected to the hydrogen-side outlet, for detecting the liquid level at the hydrogen-side outlet; and / or, An oxygen-side level gauge is connected to the oxygen-side outlet to detect the liquid level at the oxygen-side outlet.

3. The electrolytic hydrogen production system according to claim 2, characterized in that, The electrolysis hydrogen production system also includes a controller; The controller is signal-connected to the electrolytic cell and the replenishment pump; The controller is also signal-connected to the hydrogen-side level gauge and / or the oxygen-side level gauge; The controller is used to control the replenishment pump to start when the electrolytic cell is shut down, and to control the replenishment pump to stop when the hydrogen-side level gauge and / or the oxygen-side level gauge detects a liquid level signal.

4. The electrolytic hydrogen production system according to claim 2, characterized in that, The electrolytic hydrogen production system also includes: A hydrogen-side output pipeline, which is connected to the hydrogen-side gas-liquid separator and the hydrogen-side outlet; An oxygen-side output pipeline is connected to the oxygen-side gas-liquid separator and the oxygen-side outlet. The hydrogen-side level gauge is connected to one end of the hydrogen-side output pipeline near the hydrogen-side outlet, and the replenishment pump is connected to the hydrogen-side output pipeline; and / or, The oxygen-side level gauge is connected to one end of the oxygen-side output pipeline near the oxygen-side outlet, and the replenishment pump is connected to the oxygen-side output pipeline.

5. The electrolytic hydrogen production system according to any one of claims 1-4, characterized in that, The hydrogen-side outlet is located at the top of the electrolytic cell; and / or, The oxygen-side outlet is located at the top of the electrolytic cell.

6. The electrolytic hydrogen production system according to claim 5, characterized in that, The first liquid outlet and / or the second liquid outlet are located at a position not higher than the top of the electrolytic cell.

7. The electrolytic hydrogen production system according to claim 1, characterized in that, The electrolytic cell has a liquid inlet; The electrolytic hydrogen production system also includes a circulation pump, one end of which is connected to the first liquid outlet and the second liquid outlet, and the other end of which is connected to the liquid inlet. The circulating pump is used to transport the liquid in the hydrogen-side gas-liquid separator and the oxygen-side gas-liquid separator to the inlet when the electrolytic hydrogen production system is started, so that the liquid flows back to the electrolytic cell.

8. The electrolytic hydrogen production system according to claim 7, characterized in that, The electrolytic hydrogen production system also includes: A one-way valve is provided between the liquid inlet and the circulation pump, and the one-way valve is used to prevent liquid from flowing from the liquid inlet to the circulation pump.

9. The electrolytic hydrogen production system according to claim 1, characterized in that, The electrolytic cell, the hydrogen-side gas-liquid separator, the oxygen-side gas-liquid separator, and the replenishment pump are detachably connected by pipelines.

10. A container building module, characterized in that, The container building module includes an electrolytic hydrogen production system according to any one of claims 1-9.

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