Balancing unit of hydrogen production system and hydrogen production system

Abstract

The utility model provides a hydrogen production system balance unit and a hydrogen production system, the hydrogen production system balance unit comprises: a first gas-liquid separator configured to be communicated with a hydrogen outlet of an electrolytic bath; the second gas-liquid separator is configured to be communicated with an oxygen outlet of the electrolytic bath; two ends of the first pipeline are respectively communicated with the first gas-liquid separator and the second gas-liquid separator; the first one-way valve is connected to the first pipeline in series, and the first one-way valve is configured to convey liquid from the first gas-liquid separator to the second gas-liquid separator in a one-way mode; the first valve is connected to the first pipeline in series. According to the hydrogen production system, the first one-way valve and the first valve are arranged on the first pipeline, so that hydrogen and oxygen can be effectively separated, the purity of the hydrogen and the purity of the oxygen are improved, the safety of the hydrogen production system is improved, the hydrogen output pressure and the oxygen output pressure can be independently controlled, and when the hydrogen production system is maintained or troubleshot, the safety of the hydrogen production system is improved. And the maintenance cost can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen production technology, specifically to a hydrogen production system balance unit and a hydrogen production system. Background Technology

[0002] In anion exchange membrane (AEM) electrolysis hydrogen production systems, isobaric operation is commonly used to protect the anion exchange membrane from mechanical damage caused by pressure differences, prevent electrolyte leakage, and simplify system design and control. Isobaric operation is typically achieved by installing connecting pipes between the hydrogen-oxygen-liquid separators or by connecting the bottoms of the two gas-liquid separators. Isobaric operation results in a relatively simple system structure and easier control, reducing system cost and complexity.

[0003] For anion exchange membranes with sufficient mechanical strength, this isobaric operation and bottom-connected design has some limitations: first, cross-contamination of hydrogen and oxygen gases; second, difficulty in independently controlling the pressure on the hydrogen and oxygen sides; and third, the system lacks flexibility, and operation and maintenance are limited. When the system malfunctions or requires maintenance, the bottom-connected design makes it difficult to isolate the hydrogen and oxygen sides. Utility Model Content

[0004] The embodiments of this utility model provide a hydrogen production system balance unit and a hydrogen production system, which can improve the technical problems of cross-contamination of hydrogen and oxygen gases, inability to independently control hydrogen and oxygen side pressure, and inconvenience in maintaining the hydrogen production system.

[0005] In a first aspect, embodiments of the present invention provide a hydrogen production system balancing unit, comprising:

[0006] The first gas-liquid separator is configured to be connected to the hydrogen outlet of the electrolyzer;

[0007] The second gas-liquid separator is configured to be connected to the oxygen outlet of the electrolyzer;

[0008] The first pipeline has its two ends connected to the first gas-liquid separator and the second gas-liquid separator, respectively.

[0009] A first check valve is connected in series in the first pipeline, and the first check valve is configured to allow liquid to be unidirectionally delivered from the first gas-liquid separator to the second gas-liquid separator.

[0010] The first valve is connected in series on the first pipeline.

[0011] In one embodiment, the hydrogen production system balancing unit further includes a second pipeline and a liquid pump. The two ends of the second pipeline are respectively connected to the first gas-liquid separator and the second gas-liquid separator. The liquid pump is connected in series on the second pipeline and is configured to drive the liquid in the second gas-liquid separator to flow to the first gas-liquid separator.

[0012] In one embodiment, a second check valve is also connected in series on the second pipeline. The second check valve is configured to allow liquid to be unidirectionally supplied from the second gas-liquid separator to the first gas-liquid separator.

[0013] In one embodiment, the hydrogen production system balance unit further includes a third pipeline and a three-way valve. One end of the third pipeline is connected to the second pipeline through the three-way valve. The third pipeline is configured to deliver pure water to the first gas-liquid separator.

[0014] In one embodiment, the liquid pump and the second one-way valve are disposed between the three-way valve and the first gas-liquid separator.

[0015] In one embodiment, the hydrogen production system balance unit further includes a water tank, and the other end of the third pipeline is connected to the water tank.

[0016] In one embodiment, the hydrogen production system balance unit further includes a water purifier and a fourth pipeline. The water purifier is connected to the water tank through the fourth pipeline, and the water purifier is configured to deliver pure water to the water tank. A second valve is connected in series on the fourth pipeline.

[0017] In one embodiment, a first liquid level gauge is provided on the first gas-liquid separator, the first liquid level gauge being configured to monitor the liquid level in the first gas-liquid separator; and / or

[0018] The second gas-liquid separator is equipped with a second liquid level gauge, which is configured to monitor the liquid level in the second gas-liquid separator; and / or

[0019] A third liquid level gauge is installed on the water tank, and the third liquid level gauge is configured to monitor the liquid level in the water tank.

[0020] In one embodiment, the hydrogen production system balance unit further includes a controller, which is communicatively connected to the first liquid meter, the second liquid meter, the third liquid meter, the first valve, the second valve, and the three-way valve, and the controller is configured to regulate the opening and closing of the first valve, the second valve, and the three-way valve based on the monitoring results of the first liquid meter, the second liquid meter, and the third liquid meter.

[0021] In one embodiment, a drain valve is also connected in series on the first pipeline.

[0022] Secondly, embodiments of this utility model provide a hydrogen production system, including the aforementioned hydrogen production system balancing unit and an electrolyzer. The electrolyzer has a hydrogen outlet and an oxygen outlet. A first gas-liquid separator is connected to the hydrogen outlet of the electrolyzer, and a second gas-liquid separator is connected to the oxygen outlet of the electrolyzer.

[0023] The beneficial effects of the embodiments of this utility model are as follows:

[0024] In embodiments of this utility model, by setting a first one-way valve and a first valve on the first pipeline, hydrogen and oxygen can be effectively isolated, improving the purity of hydrogen and oxygen and enhancing the safety of the hydrogen production system. At the same time, the output pressure of hydrogen and oxygen can be controlled separately. During maintenance or troubleshooting of the hydrogen production system, the hydrogen side and oxygen side can be operated independently, thereby reducing maintenance costs and improving the availability and maintenance efficiency of the system. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the balance unit of the hydrogen production system provided in an embodiment of this utility model.

[0027] Explanation of reference numerals in the attached drawings: 1-First gas-liquid separator, 2-Second gas-liquid separator, 3-First liquid meter, 4-Second liquid meter, 5-Second check valve, 6-First check valve, 7-First valve, 8-Drain valve, 9-Liquid pump, 10-Second valve, 11-Three-way valve, 12-Water tank, 13-Pure water machine, 14-Inlet valve. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0029] Anion exchange membrane (AEM) electrolysis hydrogen production systems operating at isobaric pressure and with bottom connection (referring to bottom connection of the hydrogen-oxygen-liquid separator) have the following limitations:

[0030] Cross-contamination of hydrogen and oxygen gases: Even under ideal isobaric conditions, hydrogen and oxygen gases can still diffuse and permeate each other due to concentration differences and pressure fluctuations. On the one hand, due to the concentration difference, hydrogen and oxygen can permeate each other, affecting applications in fields requiring extremely high purity of hydrogen and oxygen (such as medical and scientific research), and increasing the complexity of gas analysis. On the other hand, in actual operation, the gas production rate and system pressure fluctuate dynamically, and instantaneous pressure differences can also lead to the permeation of hydrogen and oxygen. When hydrogen and oxygen mix, they form an explosive mixture, posing a potential explosion risk even at low concentrations, especially in confined spaces or in the presence of ignition sources, and traditional safety measures are insufficient for effective detection. During long-term operation, even trace amounts of hydrogen diffusion can accumulate to dangerous concentrations, increasing safety risks and potentially accelerating the corrosion of certain materials in the hydrogen production system, reducing system lifespan.

[0031] Independent control of hydrogen and oxygen side pressure is difficult: The isobaric operation and bottom connection design limit the independent control of hydrogen and oxygen side pressure. When there is a demand for gas pressure on both sides of hydrogen and oxygen, it is impossible to adjust the output pressure on both sides separately. Furthermore, it is impossible to independently control the pressure of hydrogen and oxygen side to ensure safety and stability during system startup, shutdown, or abnormal operating conditions.

[0032] The system lacks flexibility, and its operation and maintenance are limited: the bottom-connected design makes it difficult to isolate operations on the hydrogen-oxygen side when the system malfunctions or requires maintenance. For example, if it is necessary to clean or replace the gas-liquid separator on one side, the entire system must be shut down and emptied first, increasing the complexity and cost of maintenance.

[0033] The AEM hydrogen production system is an alkaline ion-exchange membrane water-based hydrogen production technology. It mainly uses an electrolyzer to produce hydrogen and oxygen. However, the hydrogen and oxygen produced are not simply hydrogen and oxygen, but rather a mixture of hydrogen and electrolyte, as well as a mixture of oxygen and electrolyte, which are generated from its positive and negative electrodes.

[0034] Please see Figure 1 In a first aspect, embodiments of the present invention provide a hydrogen production system balancing unit, comprising:

[0035] The first gas-liquid separator 1 is configured to be connected to the hydrogen outlet of the electrolyzer;

[0036] The second gas-liquid separator 2 is configured to be connected to the oxygen outlet of the electrolyzer;

[0037] The first pipeline has its two ends connected to the first gas-liquid separator 1 and the second gas-liquid separator 2, respectively.

[0038] A first check valve 6 is connected in series in the first pipeline, and the first check valve 6 is configured to unidirectionally deliver liquid from the first gas-liquid separator 1 to the second gas-liquid separator 2.

[0039] The first valve 7 is connected in series on the first pipeline.

[0040] It is understandable that when the hydrogen production system is running, closing the first valve 7 on the first pipeline allows the first gas-liquid separator 1 and the second gas-liquid separator 2 to operate independently. However, after the hydrogen production system has been running for a period of time, the liquid levels in the first gas-liquid separator 1 and the second gas-liquid separator 2 will gradually deviate from the baseline value. When the liquid level in the first gas-liquid separator 1 is higher than the liquid level in the second gas-liquid separator 2 and reaches the threshold, the first one-way valve 6 and the first valve 7 open. The liquid level balance of the first gas-liquid separator 1 and the second gas-liquid separator 2 can be achieved through the first pipeline (first liquid level balance mechanism), and the alkaline concentration of the first gas-liquid separator 1 and the second gas-liquid separator 2 can be balanced at the same time. Therefore, by using the first pipeline and the first one-way valve 6 and the first valve 7 on the first pipeline, hydrogen and oxygen can be effectively separated, improving the purity of hydrogen and oxygen and enhancing the safety of the hydrogen production system. At the same time, the output pressure of hydrogen and oxygen can be controlled separately. During the maintenance or troubleshooting of the hydrogen production system, the hydrogen side and the oxygen side can be operated independently, thereby reducing maintenance costs and improving the availability and maintenance efficiency of the system.

[0041] It can be understood that when the liquid level in the first gas-liquid separator 1 is higher than the liquid level in the second gas-liquid separator 2, and a threshold is reached, it refers to the maximum value by which the liquid level in the first gas-liquid separator 1 is higher than the liquid level in the second gas-liquid separator 2. This threshold can be set as needed. The first gas-liquid separator 1 is used to connect to the hydrogen outlet of the electrolyzer in the hydrogen production system, and the second gas-liquid separator 2 is used to connect to the oxygen outlet of the electrolyzer.

[0042] It is understood that the first valve 7 only opens when the liquid level in the first gas-liquid separator 1 is higher than the liquid level in the second gas-liquid separator 2, and reaches a threshold. After opening, because the hydrogen side pressure in the hydrogen production system is greater than the oxygen side pressure, the first one-way valve 6 opens under the action of the pressure difference. Utilizing the pressure difference between the two sides, liquid can be unidirectionally supplied from the first gas-liquid separator 1 to the second gas-liquid separator 2, thereby balancing the liquid levels in the first gas-liquid separator 1 and the second gas-liquid separator 2. At the same time, utilizing the hydrogen-oxygen side pressure difference to supply liquid can effectively reduce the energy consumption of the hydrogen production system. When the liquid levels in the first gas-liquid separator 1 and the second gas-liquid separator 2 reach equilibrium again, the first valve 7 closes.

[0043] It is understandable that water is produced at the anode and consumed at the cathode in an electrolytic cell (such as an anion exchange membrane electrolytic cell). Therefore, the liquid levels in the first gas-liquid separator 1 and the second gas-liquid separator 2 will gradually deviate from their baseline values. If the liquid levels in the first gas-liquid separator 1 and the second gas-liquid separator 2 are too high, it will affect the gas-liquid separation efficiency; if the liquid levels are too low, gas may be drawn away by the alkali circulation pump (used to transport the liquid separated in the first gas-liquid separator 1 and the second gas-liquid separator 2 back to the electrolytic cell), thus entering the electrolytic cell and affecting its working efficiency. Therefore, the first liquid level balancing mechanism can control the liquid levels in the first gas-liquid separator 1 and the second gas-liquid separator 2, while also making full use of the liquid separated by the first gas-liquid separator 1 and the second gas-liquid separator 2. Meanwhile, as the electrolytic cell operates, the concentration of the alkali solution at the cathode increases and the concentration of the alkali solution at the anode decreases, thereby increasing the concentration difference of the liquid in the first gas-liquid separator 1 and the second gas-liquid separator 2. The concentration of the alkali solution in the first gas-liquid separator 1 and the second gas-liquid separator 2 can be balanced through the first liquid level balancing mechanism, thereby controlling the concentration of the alkali solution returning to the electrolytic cell (both excessively low and excessively high alkali solution concentrations will affect the electrolysis efficiency of the electrolytic cell).

[0044] It is understood that the first valve 7 is used to control the opening and closing of the first pipeline. As an example, the first valve 7 can be a solenoid valve. The combination of the check valve and the first valve 7 can prevent liquid backflow and achieve precise control over the flow direction and opening and closing time of the first pipeline. Both the first gas-liquid separator 1 and the second gas-liquid separator 2 are gravity separation tanks.

[0045] In one embodiment, the hydrogen production system balance unit further includes a second pipeline and a liquid pump 9. The two ends of the second pipeline are respectively connected to the first gas-liquid separator 1 and the second gas-liquid separator 2. The liquid pump 9 is connected in series on the second pipeline and is configured to drive the liquid in the second gas-liquid separator 2 to flow to the first gas-liquid separator 1.

[0046] It is understandable that by setting up a second pipeline, when the liquid level in the second gas-liquid separator 2 is higher than the liquid level in the first gas-liquid separator 1 and reaches a threshold, liquid can be supplied to the first gas-liquid separator 1 through the second pipeline and the liquid pump 9 (second liquid level balancing mechanism) to balance the liquid levels in the first gas-liquid separator 1 and the second gas-liquid separator 2.

[0047] It is understood that when the liquid level in the second gas-liquid separator 2 is higher than the liquid level in the first gas-liquid separator 1, and a threshold is reached, it refers to the maximum value by which the liquid level in the second gas-liquid separator 2 is higher than the liquid level in the first gas-liquid separator 1. This threshold can be set as needed. The liquid pump 9 is used to pressurize the liquid, so that the liquid in the second gas-liquid separator 2 can be transported to the first gas-liquid separator 1.

[0048] In one embodiment, a second check valve 5 is also connected in series on the second pipeline. The second check valve 5 is configured to allow liquid to be unidirectionally delivered from the second gas-liquid separator 2 to the first gas-liquid separator 1.

[0049] It is understandable that by connecting the second check valve 5 in series on the second pipeline, the flow direction of the liquid can be controlled to prevent backflow.

[0050] In one embodiment, the hydrogen production system balance unit further includes a third pipeline and a three-way valve 11. One end of the third pipeline is connected to the second pipeline through the three-way valve 11. The third pipeline is configured to deliver pure water to the first gas-liquid separator 1.

[0051] It is understandable that the hydrogen production system consumes water during operation. A third pipeline can be installed to replenish the system with pure water. This replenished water is then transported to the first gas-liquid separator 1, allowing adjustment of the alkaline solution concentration within the separator, thereby controlling the overall alkaline solution concentration in the hydrogen production system. Connecting one end of the third pipeline to the second pipeline using a three-way valve 11 allows the pure water supplied by the third pipeline to be transported to the first gas-liquid separator 1 via the second pipeline, simplifying the equipment and saving materials. The two ends of the three-way valve 11 are connected in series on the second pipeline, and the other end of the valve is connected to one end of the third pipeline, thus enabling communication between the two pipelines.

[0052] It is understood that when the liquid level in the second gas-liquid separator 2 is higher than the liquid level in the first gas-liquid separator 1 and reaches a threshold, the three-way valve 11 is connected in series at both ends of the second pipeline, allowing liquid to be supplied from the second gas-liquid separator 2 to the first gas-liquid separator 1 through the second pipeline. When the liquid level in the second gas-liquid separator 2 reaches equilibrium with the liquid level in the first gas-liquid separator 1, the three-way solenoid valve closes. When the liquid levels in the first gas-liquid separator 1 and the second gas-liquid separator 2 are lower, the end of the three-way valve 11 connected to the third pipeline and the end connected to the first gas-liquid separator 1 are connected, allowing pure water to be supplied to the first gas-liquid separator 1 through the third pipeline and the second pipeline between the three-way valve 11 and the first gas-liquid separator 1. After a certain period of time, the three-way valve 11 closes.

[0053] As an example, when the sum of the liquid levels in the first gas-liquid separator 1 and the second gas-liquid separator 2 is less than a threshold, the end of the three-way valve 11 connected to the third pipeline and the end connected to the first gas-liquid separator 1 are connected, and pure water is supplied to the first gas-liquid separator 1 through the third pipeline and the second pipeline between the three-way valve 11 and the first gas-liquid separator 1. One end of the third pipeline is connected to the three-way valve 11, and the other end can be connected to the water tank 12 or to a faucet.

[0054] In one embodiment, the liquid pump 9 and the second one-way valve 5 are disposed between the three-way valve 11 and the first gas-liquid separator 1.

[0055] It is understandable that by placing the liquid pump 9 and the second one-way valve 5 between the three-way valve 11 and the first gas-liquid separator 1, the liquid pump 9 can be used to pressurize the liquid and the second one-way valve 5 can be used to control the liquid flow direction when water is replenished through the third pipeline and when the liquid level is balanced through the second liquid level balancing mechanism.

[0056] In one embodiment, the hydrogen production system balance unit further includes a water tank 12, and the other end of the third pipeline is connected to the water tank 12.

[0057] It is understandable that by setting up water tank 12, pure water can be stored for replenishing the hydrogen production system, thereby making the replenishment of water to the hydrogen production system more efficient.

[0058] In one embodiment, the hydrogen production system balance unit further includes a water purifier 13 and a fourth pipeline. The water purifier 13 is connected to the water tank 12 through the fourth pipeline, and the water purifier 13 is configured to deliver pure water to the water tank 12. A second valve 10 is connected in series on the fourth pipeline.

[0059] It is understandable that by setting up a water purifier 13, water can be purified to provide pure water for the hydrogen production system. The opening and closing of the water purifier 13 can be controlled by connecting a second valve 10 in series on the fourth pipeline. When the amount of pure water in the water tank 12 reaches the lower limit, the second valve 10 and the water purifier 13 are opened to replenish water into the water tank 12. When the amount of pure water in the water tank 12 reaches the upper limit, the second valve 10 and the water purifier 13 are closed to stop replenishing water into the water tank 12.

[0060] As an example, the inlet of the water purifier 13 is connected to a tap water pipe, and an inlet valve 14 is installed on the tap water pipe.

[0061] In one embodiment, a first liquid level gauge 3 is provided on the first gas-liquid separator 1, and the first liquid level gauge 3 is configured to monitor the liquid level in the first gas-liquid separator 1.

[0062] It is understandable that by setting a first liquid meter 3 on the first gas-liquid separator 1, the liquid level in the first gas-liquid separator 1 can be monitored, and the opening and closing of the first valve 7 and the three-way valve 11 can be controlled according to the monitoring results of the second liquid meter 4.

[0063] In one embodiment, a second liquid level gauge 4 is provided on the second gas-liquid separator 2, and the second liquid level gauge 4 is configured to monitor the liquid level in the second gas-liquid separator 2.

[0064] It is understandable that by installing a second liquid gauge 4 on the second gas-liquid separator 2, the liquid level in the second gas-liquid separator 2 can be monitored, and the opening and closing of the first valve 7 and the three-way valve 11 can be controlled according to the monitoring results of the second liquid gauge 4.

[0065] In one embodiment, a third liquid level gauge is provided on the water tank 12, and the third liquid level gauge is configured to monitor the liquid level in the water tank 12.

[0066] It is understandable that by installing a third liquid level gauge on the water tank 12, the liquid level in the water tank 12 can be monitored, and the opening and closing of the second valve 10 can be controlled according to the monitoring results of the third liquid level gauge.

[0067] In one embodiment, the hydrogen production system balance unit further includes a controller, which is communicatively connected to a first liquid meter 3, a second liquid meter 4, a third liquid meter, a first valve 7, a second valve 10, and a three-way valve 11, and is configured to regulate the opening and closing of the first valve 7, the second valve 10, and the three-way valve 11 based on the monitoring results of the first liquid meter 3, the second liquid meter 4, and the third liquid meter.

[0068] It is understandable that by setting up a controller, the monitoring results of the first liquid level gauge 3, the second liquid level gauge 4, and the third liquid level gauge can be obtained through the controller, and the first valve 7, the second valve 10, and the three-way valve 11 can be opened and closed according to the monitoring results, thereby realizing the automatic control of the hydrogen production system balance unit. The first liquid level gauge 3, the second liquid level gauge 4, and the third liquid level gauge are all mechanical liquid level gauges.

[0069] As an example, the controller can be a programmable logic controller (PLC), and the first valve 7, the second valve 10, and the three-way valve 11 are all solenoid valves.

[0070] In one embodiment, the water supply pump is communicatively connected to the controller.

[0071] As an example, when the three-way valve 11 is open, the controller controls the water supply pump to start; when the three-way valve 11 is closed, the controller controls the water supply pump to stop.

[0072] In one embodiment, a drain valve 8 is also connected in series on the first pipeline.

[0073] It is understandable that by setting up vent valve 8, when the hydrogen production system needs maintenance and cleaning, the alkaline solution in the system can be discharged by opening vent valve 8.

[0074] Secondly, embodiments of this utility model provide a hydrogen production system, including the aforementioned hydrogen production system balancing unit and an electrolyzer. The electrolyzer has a hydrogen outlet and an oxygen outlet. A first gas-liquid separator 1 is connected to the hydrogen outlet of the electrolyzer, and a second gas-liquid separator 2 is connected to the oxygen outlet of the electrolyzer.

[0075] In one embodiment, the liquid outlet of the first gas-liquid separator 1 and the liquid outlet of the second gas-liquid separator 2 are connected to the electrolyte inlet of the electrolytic cell.

[0076] It is understood that the liquid outlet of the first gas-liquid separator 1 and the liquid outlet of the second gas-liquid separator 2 are connected to the electrolyte inlet of the electrolytic cell via pipelines. The alkaline solution separated by the first gas-liquid separator 1 and the second gas-liquid separator 2 can be returned to the electrolytic cell via an alkaline solution circulation pump.

[0077] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A balance unit for a hydrogen production system, characterized in that, include: The first gas-liquid separator is configured to be connected to the hydrogen outlet of the electrolyzer; The second gas-liquid separator is configured to be connected to the oxygen outlet of the electrolyzer; The first pipeline has its two ends connected to the first gas-liquid separator and the second gas-liquid separator, respectively. A first check valve is connected in series in the first pipeline, and the first check valve is configured to allow liquid to be unidirectionally delivered from the first gas-liquid separator to the second gas-liquid separator. The first valve is connected in series on the first pipeline.

2. The hydrogen production system balance unit according to claim 1, characterized in that, The hydrogen production system balance unit also includes a second pipeline and a liquid pump. The two ends of the second pipeline are respectively connected to the first gas-liquid separator and the second gas-liquid separator. The liquid pump is connected in series on the second pipeline and is configured to drive the liquid in the second gas-liquid separator to flow to the first gas-liquid separator.

3. The hydrogen production system balance unit according to claim 2, characterized in that, A second check valve is also connected in series on the second pipeline. The second check valve is configured to allow liquid to be unidirectionally supplied from the second gas-liquid separator to the first gas-liquid separator.

4. The hydrogen production system balance unit according to claim 3, characterized in that, The hydrogen production system balance unit also includes a third pipeline and a three-way valve. One end of the third pipeline is connected to the second pipeline through the three-way valve. The third pipeline is configured to deliver pure water to the first gas-liquid separator.

5. The hydrogen production system balance unit according to claim 4, characterized in that, The liquid pump and the second one-way valve are located between the three-way valve and the first gas-liquid separator.

6. The hydrogen production system balance unit according to claim 5, characterized in that, The hydrogen production system balance unit also includes a water tank, and the other end of the third pipeline is connected to the water tank.

7. The hydrogen production system balance unit according to claim 6, characterized in that, The hydrogen production system balance unit also includes a water purifier and a fourth pipeline. The water purifier is connected to the water tank through the fourth pipeline, and the water purifier is configured to deliver pure water to the water tank. A second valve is connected in series on the fourth pipeline.

8. The hydrogen production system balance unit according to claim 7, characterized in that, The first gas-liquid separator is equipped with a first liquid level gauge, which is configured to monitor the liquid level in the first gas-liquid separator; and / or The second gas-liquid separator is equipped with a second liquid level gauge, which is configured to monitor the liquid level in the second gas-liquid separator. and / or A third liquid level gauge is installed on the water tank, and the third liquid level gauge is configured to monitor the liquid level in the water tank.

9. The hydrogen production system balance unit according to claim 8, characterized in that, The hydrogen production system balance unit also includes a controller, which is communicatively connected to the first liquid meter, the second liquid meter, the third liquid meter, the first valve, the second valve, and the three-way valve. The controller is configured to regulate the opening and closing of the first valve, the second valve, and the three-way valve based on the monitoring results of the first liquid meter, the second liquid meter, and the third liquid meter.

10. The hydrogen production system balance unit according to claim 1, characterized in that, An air vent valve is also connected in series on the first pipeline.

11. A hydrogen production system, characterized in that, The system includes a hydrogen production system balancing unit and an electrolyzer as described in any one of claims 1-10, wherein the electrolyzer has a hydrogen outlet and an oxygen outlet, the first gas-liquid separator is connected to the hydrogen outlet of the electrolyzer, and the second gas-liquid separator is connected to the oxygen outlet of the electrolyzer.

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