Hydrogen production system

Abstract

The utility model provides a hydrogen production system. In the application, the liquid storage device provides electrolyte for the electrolytic cell, the electrolytic cell electrolyzes water in the electrolyte to generate hydrogen and oxygen, and the hydrogen entraining the electrolyte flows into the hydrogen gas-liquid separator through the first hydrogen exhaust pipeline; the air pressure in the hydrogen gas-liquid separator is greater than that in the liquid storage device, and the electrolyte in the hydrogen gas-liquid separator can flow back into the liquid storage device through the water return pipeline under the action of the air pressure difference, so that cyclic utilization of the electrolyte is realized, and the electrolyte in the hydrogen gas-liquid separator can be conveyed back into the liquid storage device without arranging a water pump; energy for operating the water pump can be saved, the structure of the hydrogen production system is simplified, and energy consumption and cost of the hydrogen production system are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen production by water electrolysis, and in particular to a hydrogen production system. BACKGROUND

[0002] The hydrogen production system by water electrolysis is a hydrogen production technology that has attracted much attention in recent years. The system uses a proton exchange membrane as an electrolyte, under the condition of power supply, water molecules are decomposed into hydrogen and oxygen, thereby realizing clean and efficient hydrogen production. The hydrogen production system usually includes an alkali tank, an electrolytic tank and a hydrogen gas-liquid separator which are connected with each other. The alkali tank is used to provide electrolyte for the electrolytic tank. The electrolytic tank electrolyzes water in the electrolyte to produce hydrogen and oxygen. Hydrogen and part of the electrolyte flow into the hydrogen gas-liquid separator. After gas-liquid separation, hydrogen is discharged from the gas-liquid separator, and the electrolyte remains in the hydrogen gas-liquid separator.

[0003] In the related art, hydrogen produced in the electrolytic tank is mixed with electrolyte in gas-liquid phase and enters the hydrogen gas-liquid separator. When the electrolyte in the hydrogen gas-liquid separator accumulates to a certain amount, the electrolyte needs to be pumped back to the alkali tank by a circulating pump to realize the recycling of the electrolyte. However, the use of the circulating pump to pump the electrolyte back to the alkali tank needs to consume electric energy or other forms of energy to operate the circulating pump, thereby increasing the energy consumption and cost of the hydrogen production system. CONTENT OF THE UTILITY MODEL

[0004] In the related art, the use of the circulating pump to pump the electrolyte in the hydrogen gas-liquid separator back to the alkali tank needs to consume electric energy or other forms of energy to operate the circulating pump, thereby increasing the energy consumption and cost of the hydrogen production system, which needs to be further improved.

[0005] To solve the above problems, the embodiments of the present application provide a hydrogen production system, which can improve the technical problem that the use of the circulating pump to pump the electrolyte back to the alkali tank needs to consume electric energy or other forms of energy to operate the circulating pump, thereby increasing the energy consumption and cost of the hydrogen production system.

[0006] The embodiments of the present application provide a hydrogen production system, which comprises:

[0007] An electrolytic tank, which is used to electrolyze water in electrolyte to produce hydrogen and oxygen;

[0008] A liquid storage device, which is communicated with the electrolytic tank through a liquid supply pipeline to supply electrolyte to the electrolytic tank;

[0009] A hydrogen gas-liquid separator, which is communicated with the electrolytic tank and the liquid storage device through a first hydrogen exhaust pipeline and a water return pipeline, respectively;

[0010] The gas pressure in the hydrogen gas-liquid separator is greater than the gas pressure in the liquid storage device.

[0011] In an embodiment, the hydrogen production system further comprises a hydrogen receiving device and a second hydrogen exhaust pipeline, the hydrogen gas-liquid separator is in communication with the hydrogen receiving device through the second hydrogen exhaust pipeline, and a pressure controller is arranged on the second hydrogen exhaust pipeline, the pressure controller being configured to control the gas pressure in the hydrogen gas-liquid separator.

[0012] In an embodiment, a first pressure detector is arranged on the hydrogen gas-liquid separator, the first pressure detector being configured to detect the gas pressure in the hydrogen gas-liquid separator.

[0013] In an embodiment, a first valve is arranged on the water return pipeline, the first valve being configured to open or close the water return pipeline.

[0014] In an embodiment, a first liquid level detector is arranged on the hydrogen gas-liquid separator, the first liquid level detector being configured to detect the liquid level of the electrolyte in the hydrogen gas-liquid separator, so as to open or close the first valve.

[0015] In an embodiment, a first cooler is arranged on the first hydrogen exhaust pipeline.

[0016] In an embodiment, the hydrogen production system further comprises a first oxygen exhaust pipeline and a second oxygen exhaust pipeline.

[0017] One end of the first oxygen exhaust pipeline is configured to output oxygen, and the other end of the first oxygen exhaust pipeline is in communication with the liquid storage device.

[0018] One end of the second oxygen exhaust pipeline is in communication with the liquid storage device, and the other end of the second oxygen exhaust pipeline is in communication with the electrolytic cell.

[0019] In an embodiment, a second pressure detector is arranged on the first oxygen exhaust pipeline, the second pressure detector being configured to detect the gas pressure in the liquid storage device.

[0020] In an embodiment, a water pump is arranged on the liquid supply pipeline, the water pump being configured to deliver the electrolyte in the liquid storage device to the electrolytic cell, and / or the water pump being configured to deliver the electrolyte in the electrolytic cell back to the liquid storage device through the second oxygen exhaust pipeline.

[0021] In an embodiment, a second cooler is further arranged on the liquid supply pipeline, the second cooler being located between the water pump and the electrolytic cell.

[0022] In an embodiment, the liquid supply pipeline is further provided with a temperature sensor, which is located between the second cooler and the electrolytic tank, and is used to detect the temperature of the electrolyte in the liquid supply pipeline.

[0023] In an embodiment, the hydrogen production system further comprises a water supply device, which is in communication with the liquid storage device through a water supply pipeline, and the water supply pipeline is provided with a second valve, which is used to open or close the water supply pipeline.

[0024] In an embodiment, the liquid storage device is provided with a second liquid level detector, which is used to detect the liquid level of the electrolyte in the liquid storage device, so as to open or close the second valve.

[0025] The beneficial effects of the embodiments of the present application are as follows:

[0026] In the present application, the liquid storage device provides electrolyte for the electrolytic tank, the electrolytic tank electrolyzes water in the electrolyte to produce hydrogen and oxygen, the hydrogen entrains the electrolyte and flows to the hydrogen gas-liquid separator through the first hydrogen exhaust pipeline; the gas pressure in the hydrogen gas-liquid separator is greater than the gas pressure in the liquid storage device, and the electrolyte in the hydrogen gas-liquid separator can flow back to the liquid storage device through the backwater pipeline under the action of the pressure difference, so as to realize the recycling of the electrolyte, without the need to set a water pump to transport the electrolyte in the hydrogen gas-liquid separator back to the liquid storage device, which can save the energy for operating the water pump, simplify the structure of the hydrogen production system, and reduce the energy consumption and cost of the hydrogen production system. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 is a structural schematic diagram of a hydrogen production system provided by an embodiment of the present application;

[0029] Figure 2 is a structural schematic diagram of a hydrogen production system provided by another embodiment of the present application;

[0030] Figure 3 is a structural schematic diagram of a hydrogen production system provided by another embodiment of the present application;

[0031] Figure 4 is a structural schematic diagram of a hydrogen production system provided by another embodiment of the present application;

[0032] Figure 5is a structural schematic diagram of a hydrogen production system provided by another embodiment of the present application.

[0033] Reference signs:

[0034] 100, hydrogen production system; 1, liquid storage device; 11, liquid supply pipeline; 12, first oxygen exhaust pipeline; 13, second oxygen exhaust pipeline; 14, second pressure detector; 15, water pump; 16, second cooler; 17, temperature sensor; 2, electrolytic cell; 3, hydrogen gas-liquid separator; 31, first hydrogen exhaust pipeline; 32, water return pipeline; 33, second hydrogen exhaust pipeline; 34, pressure controller; 35, first pressure detector; 36, first valve; 37, first liquid level detector; 38, first cooler; 4, hydrogen receiving device; 5, water supply device; 51, water supply pipeline; 52, second valve; 53, second liquid level detector. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the outline of the device.

[0036] Reference Figure 1The hydrogen production system 100 of the present application comprises an electrolytic cell 2, a liquid storage device 1 and a hydrogen gas-liquid separator 3. The electrolytic cell 2 is used to electrolyze water in electrolyte to produce hydrogen and oxygen. The liquid storage device 1 is in communication with the electrolytic cell 2 through a liquid supply pipeline 11 to supply electrolyte to the electrolytic cell 2. The hydrogen gas-liquid separator 3 is in communication with the electrolytic cell 2 and the liquid storage device 1 through a first hydrogen exhaust pipeline 31 and a water return pipeline 32 respectively, wherein the gas pressure in the hydrogen gas-liquid separator 3 is greater than the gas pressure in the liquid storage device 1. Specifically, the electrolyte in the liquid storage device 1 can flow to the electrolytic cell 2 through the liquid supply pipeline 11. The electrolytic cell 2 electrolyzes water in the electrolyte to produce hydrogen and oxygen. The hydrogen gas entrains part of the electrolyte and flows to the hydrogen gas-liquid separator 3 through the first hydrogen exhaust pipeline 31. After the hydrogen gas and the electrolyte are separated in the hydrogen gas-liquid separator 3, the electrolyte remains in the hydrogen gas-liquid separator 3. When the amount of electrolyte in the hydrogen gas-liquid separator 3 reaches a certain amount, the electrolyte in the hydrogen gas-liquid separator 3 needs to be discharged to the liquid storage device 1. In this embodiment, the gas pressure in the hydrogen gas-liquid separator 3 is greater than the gas pressure in the liquid storage device 1. The electrolyte in the hydrogen gas-liquid separator 3 can flow back to the liquid storage device 1 under the action of the pressure difference, so as to realize the recycling of the electrolyte. Without the need to set a water pump 15, the electrolyte in the hydrogen gas-liquid separator 3 can be transported back to the liquid storage device 1, which can save the energy for operating the water pump 15, simplify the structure of the hydrogen production system 100, and reduce the energy consumption and cost of the hydrogen production system 100.

[0037] In this embodiment, the concentration of the electrolyte is not limited. Optionally, the concentration of the electrolyte can be 5%wt of alkaline solution. The 5%wt of alkaline solution can reduce the corrosion of the electrolyte to the electrolytic cell 2 and reduce the corrosion resistance requirement of the material of the electrolytic cell 2. In this embodiment, the type of catalyst for electrolyzing water in the electrolytic cell 2 is not limited. Optionally, the catalyst uses a non-noble metal material, which can effectively reduce the hydrogen production cost.

[0038] In an embodiment, referring to Figure 2 , the hydrogen production system 100 further comprises a hydrogen receiving device 4 and a second hydrogen exhaust pipeline 33. The hydrogen gas-liquid separator 3 is in communication with the hydrogen receiving device 4 through the second hydrogen exhaust pipeline 33. The second hydrogen exhaust pipeline 33 is provided with a pressure controller 34 for controlling the gas pressure in the hydrogen gas-liquid separator 3. In this embodiment, after the hydrogen gas and the electrolyte are separated in the hydrogen gas-liquid separator 3, the hydrogen gas in the hydrogen gas-liquid separator 3 flows to the hydrogen receiving device 4 through the second hydrogen exhaust pipeline 33. The pressure controller 34 can adjust the valve opening degree of the second hydrogen exhaust pipeline 33 according to the gas pressure requirement of different hydrogen products, so as to control the gas pressure in the hydrogen gas-liquid separator 3 and the gas pressure of the hydrogen gas discharged from the second hydrogen exhaust pipeline 33. Optionally, the gas pressure of the hydrogen gas discharged from the second hydrogen exhaust pipeline 33 is greater than 0 and less than 1.6 MPa.

[0039] In an embodiment, referring to Figure 2 , the hydrogen gas-liquid separator 3 is provided with a first pressure detector 35, and the first pressure detector 35 is used to detect the gas pressure in the hydrogen gas-liquid separator 3. In this embodiment, the first pressure detector 35 can monitor the gas pressure in the hydrogen gas-liquid separator 3, prevent safety accidents, improve the reliability of the equipment, and ensure that the hydrogen production system 100 is always in the best working state.

[0040] In this embodiment, the type of the first pressure detector 35 is not limited, and the first pressure detector 35 can be one of a piezoelectric pressure sensor, a capacitive pressure sensor, and a semiconductor pressure sensor. The number of the first pressure detector 35 is not limited, and the number of the first pressure detector 35 can be one or more.

[0041] In an embodiment, referring to Figure 2 , the water return pipeline 32 is provided with a first valve 36, and the first valve 36 is used to open or close the water return pipeline 32. In this embodiment, when the first valve 36 is in an open state, the electrolyte in the hydrogen gas-liquid separator 3 can flow back into the liquid storage device 1 under the action of the gas pressure difference through the water return pipeline 32; when the first valve 36 is in a closed state, the water return pipeline 32 is blocked, and the electrolyte in the hydrogen gas-liquid separator 3 cannot flow back into the liquid storage device 1 under the action of the gas pressure difference through the water return pipeline 32.

[0042] In an embodiment, referring to Figure 2 , the hydrogen gas-liquid separator 3 is provided with a first liquid level detector 37, and the first liquid level detector 37 is used to detect the liquid level height of the electrolyte in the hydrogen gas-liquid separator 3, so as to open and close the first valve 36. In this embodiment, the hydrogen gas-liquid separator 3 is provided with a preset liquid level height, and when the first liquid level detector 37 detects that the liquid level height of the electrolyte reaches the preset liquid level height, the hydrogen production system 100 controls the first valve 36 to be opened, and the electrolyte in the hydrogen gas-liquid separator 3 can flow back into the liquid storage device 1 under the action of the gas pressure difference through the water return pipeline 32, so as to timely discharge the electrolyte in the hydrogen gas-liquid separator 3.

[0043] In this embodiment, the type of the first liquid level detector 37 is not limited, and the first liquid level detector 37 can be one of a magnetic float liquid level meter, a float liquid level meter, a radar liquid level meter, and an ultrasonic liquid level meter. The number of the first liquid level detector 37 is not limited, and the number of the first liquid level detector 37 can be one or more.

[0044] In an embodiment, referring to Figure 2The first hydrogen exhaust pipeline 31 is provided with a first cooler 38. The first cooler 38 can dissipate heat of hydrogen and electrolyte entrained in the hydrogen in the first hydrogen exhaust pipeline 31, so as to prevent the temperature of hydrogen and electrolyte entering the hydrogen gas-liquid separator 3 from being too high. In the embodiment, the type of the first cooler 38 is not limited, and the first cooler 38 can be one of a serpentine cooler, a finned radiator, and a jacketed cooler.

[0045] In an embodiment, referring to Figure 3 and Figure 4 , the hydrogen production system 100 further comprises a first oxygen exhaust pipeline 12 and a second oxygen exhaust pipeline 13. One end of the first oxygen exhaust pipeline 12 is configured to output oxygen, and the other end is in communication with the liquid storage device 1. One end of the second oxygen exhaust pipeline 13 is in communication with the liquid storage device 1, and the other end is in communication with the electrolytic cell 2. Specifically, oxygen generated in the electrolytic cell 2 can flow to the liquid storage device 1 through the second oxygen exhaust pipeline 13, and the oxygen in the liquid storage device 1 is separated from the liquid and then discharged to an oxygen collection device or the external atmosphere through the first oxygen exhaust pipeline 12. Alternatively, one end of the first oxygen exhaust pipeline 12 is configured to communicate with the external atmosphere, and the other end is in communication with the liquid storage device 1. Oxygen in the liquid storage device 1 can be directly discharged to the external atmosphere, without the need for an additional oxygen collection device, thereby simplifying the structure of the hydrogen production system 100.

[0046] In an embodiment, referring to Figure 3 and Figure 4 , the first oxygen exhaust pipeline 12 is provided with a second pressure detector 14, which is configured to detect the gas pressure in the liquid storage device 1. In the embodiment, when the second pressure detector 14 detects that the gas pressure in the liquid storage device 1 is too high or too low, a signal is sent to the controller of the hydrogen production system 100. The controller controls the electrolytic current of the electrolytic cell 2 to control the amount of gas produced by electrolysis of water, thereby regulating the gas pressure in the liquid storage device 1 and improving the reliability of the equipment.

[0047] In the embodiment, the type of the first pressure detector 35 is not limited, and the first pressure detector 35 can be one of a piezoelectric pressure sensor, a capacitive pressure sensor, and a semiconductor pressure sensor. The number of the first pressure detector 35 is not limited, and the number of the first pressure detector 35 can be one or more.

[0048] In an embodiment, referring to Figure 4 , the liquid supply pipeline 11 is provided with a water pump 15, which is configured to deliver electrolyte in the liquid storage device 1 to the electrolytic cell 2. In the embodiment, the water pump 15 can provide stable pressure, so as to ensure that the electrolyte is delivered to the electrolytic cell 2 at a certain flow rate and flow volume, so as to meet the demand of the electrolytic cell 2 for electrolyte.

[0049] In an embodiment, the water pump 15 is also used to deliver the electrolyte in the electrolysis tank 2 back to the liquid storage device 1 through the second oxygen exhaust pipeline 13. In this embodiment, only one water pump 15 is needed to realize the circulation of the electrolyte between the electrolysis tank 2 and the liquid storage device 1, which can save the number of water pumps 15, simplify the structure of the hydrogen production system 100, and reduce the cost of hydrogen production.

[0050] In an embodiment, referring to Figure 4 , the liquid supply pipeline 11 is further provided with a second cooler 16, and the second cooler 16 is located between the water pump 15 and the electrolysis tank 2. In this embodiment, the second cooler 16 can dissipate heat of the electrolyte in the liquid supply pipeline 11, so as to prevent the temperature of the electrolyte entering the electrolysis tank 2 from being too high. In this embodiment, the type of the second cooler 16 is not limited, and the second cooler 16 can be one of a serpentine cooler, a finned radiator, and a jacketed cooler.

[0051] In an embodiment, referring to Figure 4 , the liquid supply pipeline 11 is further provided with a temperature sensor 17, and the temperature sensor 17 is located between the second cooler 16 and the electrolysis tank 2. The temperature sensor 17 is used to detect the temperature of the electrolyte in the liquid supply pipeline 11 after flowing through the second cooler 16. The temperature sensor 17 can monitor the cooling effect of the second cooler 16, so as to facilitate subsequent adjustment of the second cooler 16 according to the cooling effect, ensure that the electrolyte in the electrolysis tank 2 is within a suitable temperature range, and prolong the service life of the electrolysis tank 2. In this embodiment, the type of the temperature sensor 17 is not limited, and the temperature sensor 17 can be one of a thermocouple sensor, a resistance temperature detector, and a thermistor sensor.

[0052] In an embodiment, referring to Figure 5 , the hydrogen production system 100 further comprises a water supply device 5, and the water supply device 5 is in communication with the liquid storage device 1 through a water supply pipeline 51. The water supply pipeline 51 is provided with a second valve 52, and the second valve 52 is used to open or close the water supply pipeline 51. In this embodiment, when the second valve 52 is in an open state, water in the water supply device 5 can flow to the liquid storage device 1 through the water supply pipeline 51; when the second valve 52 is in a closed state, the water supply pipeline 51 is blocked, and water in the water supply device 5 cannot flow to the liquid storage device 1.

[0053] In an embodiment, referring to Figure 5The second liquid level detector 53 is used to detect the liquid level height of the electrolyte in the liquid storage device 1, so as to open and close the second valve 52. In the embodiment, the liquid storage device 1 is provided with a preset liquid level height. When the second liquid level detector 53 detects that the liquid level height of the electrolyte reaches the preset liquid level height, the hydrogen production system 100 controls the second valve 52 to be opened, so that the water in the water supply device 5 can flow to the liquid storage device 1 through the water supply pipe 51, and the liquid storage device 1 is timely watered, thereby effectively controlling the ion concentration balance of the electrolyte in the liquid storage device 1.

[0054] In the embodiment, the type of the second liquid level detector 53 is not limited, and the second liquid level detector 53 can be one of a magnetic flap liquid level meter, a float ball liquid level meter, a radar liquid level meter, and an ultrasonic liquid level meter. The number of the second liquid level detector 53 is not limited, and the number of the second liquid level detector 53 can be one or more.

[0055] The above describes the embodiments of the present application in detail, and the principles and implementation manners of the present application are described by applying specific examples. The above embodiment is only used to help understand the method of the present application and the core idea thereof; meanwhile, for those skilled in the art, the specific implementation manner and application range can be changed according to the idea of the present application. In conclusion, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A hydrogen production system, characterized in that, include: An electrolytic cell used to electrolyze water in an electrolyte to produce hydrogen and oxygen; A liquid storage device is connected to the electrolytic cell via a liquid supply pipeline to supply electrolyte to the electrolytic cell; A hydrogen gas-liquid separator, wherein the hydrogen gas-liquid separator is connected to the electrolytic cell and the liquid storage device through a first hydrogen exhaust pipe and a return water pipe, respectively. The gas pressure in the hydrogen gas-liquid separator is greater than the gas pressure in the liquid storage device.

2. The hydrogen production system according to claim 1, characterized in that, The hydrogen production system also includes a hydrogen receiving device and a second hydrogen exhaust pipeline. The hydrogen gas-liquid separator is connected to the hydrogen receiving device through the second hydrogen exhaust pipeline. A pressure controller is provided on the second hydrogen exhaust pipeline to control the gas pressure in the hydrogen gas-liquid separator.

3. The hydrogen production system according to claim 1 or 2, characterized in that, The hydrogen gas-liquid separator is equipped with a first pressure detector, which is used to detect the gas pressure in the hydrogen gas-liquid separator.

4. The hydrogen production system according to claim 1 or 2, characterized in that, The return water pipeline is equipped with a first valve, which is used to open or close the return water pipeline.

5. The hydrogen production system according to claim 4, characterized in that, The hydrogen gas-liquid separator is equipped with a first liquid level detector, which is used to detect the liquid level of the electrolyte in the hydrogen gas-liquid separator, so as to open or close the first valve.

6. The hydrogen production system according to claim 1 or 2, characterized in that, A first cooler is provided on the first hydrogen exhaust pipe.

7. The hydrogen production system according to claim 1 or 2, characterized in that, The hydrogen production system also includes a first oxygen exhaust pipe and a second oxygen exhaust pipe. One end of the first oxygen exhaust pipe is used to output oxygen, and the other end is connected to the liquid storage device; One end of the second oxygen exhaust pipe is connected to the liquid storage device, and the other end is connected to the electrolytic cell.

8. The hydrogen production system according to claim 7, characterized in that, A second pressure detector is provided on the first oxygen exhaust pipe, and the second pressure detector is used to detect the gas pressure in the liquid storage device.

9. The hydrogen production system according to claim 7, characterized in that, A water pump is provided on the liquid supply pipeline. The water pump is used to transport the electrolyte in the liquid storage device to the electrolytic cell, and / or, the water pump is used to transport the electrolyte in the electrolytic cell back to the liquid storage device through the second oxygen exhaust pipeline.

10. The hydrogen production system according to claim 9, characterized in that, A second cooler is also provided on the liquid supply pipeline, which is located between the water pump and the electrolytic cell.

11. The hydrogen production system according to claim 10, characterized in that, A temperature sensor is also provided on the liquid supply pipeline. The temperature sensor is located between the second cooler and the electrolytic cell. The temperature sensor is used to detect the temperature of the electrolyte in the liquid supply pipeline.

12. The hydrogen production system according to claim 1 or 2, characterized in that, The hydrogen production system also includes a water supply device, which is connected to the liquid storage device via a water supply pipe. The water supply pipe is equipped with a second valve, which is used to open or close the water supply pipe.

13. The hydrogen production system according to claim 12, characterized in that, The liquid storage device is equipped with a second liquid level detector, which is used to detect the liquid level of the electrolyte in the liquid storage device in order to open or close the second valve.

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