Electrolytic bath gas control system and control method thereof

Abstract

The invention discloses an electrolytic bath gas control system and a control method thereof. According to the application, the first purge gas supply pipeline is arranged on the pure water supply pipeline on the anode side of the electrolytic cell, and the hydrogen concentration detector is arranged on the oxygen output pipeline on the anode side of the electrolytic cell and is used for detecting the real-time hydrogen concentration of the gas in the oxygen output pipeline; and the first purge gas supply pipeline is controlled to be opened to inject purge gas into the electrolytic cell until the real-time hydrogen concentration is smaller than a preset hydrogen concentration limit value, the hydrogen concentration of gas in the oxygen output pipeline can be effectively controlled to prolong the operation time of the electrolytic cell, and the low-load operation duration of the electrolytic cell can be prolonged.

Description

Technical Field

[0001] This application relates to the technical field of electrolytic hydrogen production, and particularly relates to an electrolytic cell gas control system and a control method thereof. Background Art

[0002] The electrolytic hydrogen production system controls direct current to pass through the electrolytic cell. The electrolytic cell undergoes an electrochemical reaction to generate hydrogen and oxygen. High-pressure hydrogen will permeate through the diaphragm into the low-pressure oxygen, and an explosive gas mixture will be generated when the hydrogen concentration in the oxygen is relatively high. When the prior art detects that the hydrogen concentration in the oxygen exceeds the standard, the system needs to shut down. Since the hydrogen concentration in the oxygen increases as the operating load of the electrolytic cell decreases, the existing electrolytic cells cannot operate at low load for a long time, which affects the adjustment range of the electrolytic cell. Therefore, how to effectively control the hydrogen concentration in the oxygen to extend the operating time of the electrolytic cell has become an urgent technical problem to be solved. Summary of the Invention

[0003] The embodiments of this application provide an electrolytic cell gas control system and a control method thereof. By controlling the hydrogen concentration in the oxygen side of the electrolytic cell through a purging method to extend the operating time of the electrolytic cell, the technical problem that the existing electrolytic cells cannot operate at low load for a long time and affect the adjustment range of the electrolytic cell can be solved.

[0004] The embodiments of this application provide an electrolytic cell gas control system, including: An electrolytic cell, which has an anode side and a cathode side; A pure water supply pipeline, which is connected to the anode side and is used to supply pure water into the electrolytic cell; An oxygen output pipeline, which is connected to the anode side and is used to discharge oxygen; A hydrogen output pipeline, which is connected to the cathode side and is used to discharge hydrogen; A hydrogen concentration detector, which is arranged on the oxygen output pipeline and is used to detect the real-time hydrogen concentration of the gas in the oxygen output pipeline; A first purging gas supply pipeline, which is connected to the pure water supply pipeline; when the real-time hydrogen concentration is less than or equal to the preset hydrogen concentration limit value, control the first purging gas supply pipeline to close; when the real-time hydrogen concentration is greater than the preset hydrogen concentration limit value, control the first purging gas supply pipeline to open and inject purging gas into the electrolytic cell until the real-time hydrogen concentration is less than the preset hydrogen concentration limit value.

[0005] Further, the pure water supply pipeline is provided with a pure water supply port, and the first purging gas supply pipeline is provided with a first purging gas supply port.

[0006] Further, the electrolytic cell gas control system further includes: A control system, connected to the first purge gas supply pipeline, is provided with a timer; when controlling the opening of the first purge gas supply pipeline to inject purge gas into the electrolytic cell, the timer is reset and started to record the purge time; when it is detected that the purge time is greater than the maximum purge duration threshold, the electrolytic cell is controlled to shut down, the pure water supply pipeline is closed, and the first purge gas supply pipeline is kept open to continue injecting purge gas into the electrolytic cell. When the hydrogen concentration detector detects that the real-time hydrogen concentration is less than the hydrogen concentration reset value, the first purge gas supply pipeline is closed to stop injecting purge gas into the electrolytic cell.

[0007] Further, the electrolytic cell gas control system further includes: A first purge gas diversion pipeline, with its two ends respectively connected to the pure water supply pipeline and the oxygen output pipeline; when the electrolytic cell starts, the first purge gas diversion pipeline is controlled to be closed; when the hydrogen concentration detector detects that the real-time hydrogen concentration is less than the hydrogen concentration reset value, after closing the first purge gas supply pipeline to stop injecting purge gas into the electrolytic cell, the first purge gas diversion pipeline is opened to divert the purge gas and reduce the purge gas entering the electrolytic cell.

[0008] Further, a first cut-off valve is provided on the first purge gas diversion pipeline; the first end of the first purge gas diversion pipeline is connected to the pure water supply pipeline and is located downstream of the first purge gas supply pipeline, and the second end of the first purge gas diversion pipeline is connected to the oxygen output pipeline and is located downstream of the hydrogen concentration detector.

[0009] Further, the electrolytic cell gas control system further includes: A second purge gas supply pipeline, connected to the cathode side; when the electrolytic cell starts, the second purge gas supply pipeline is controlled to be closed; when the electrolytic cell shuts down, the second purge gas supply pipeline is opened to inject purge gas into the electrolytic cell.

[0010] Further, the electrolytic cell gas control system further includes: A second purge gas diversion pipeline, with its two ends respectively connected to the second purge gas supply pipeline and the hydrogen output pipeline; when the electrolytic cell starts, the second purge gas diversion pipeline is controlled to be opened; when the electrolytic cell shuts down, the second purge gas diversion pipeline is controlled to be closed; when the hydrogen concentration detector detects that the real-time hydrogen concentration is less than the hydrogen concentration reset value, the second purge gas diversion pipeline is closed to stop injecting purge gas into the electrolytic cell, and the second purge gas diversion pipeline is opened to divert the purge gas and reduce the purge gas entering the electrolytic cell.

[0011] Further, a second cut-off valve is provided on the second purge gas shunt pipeline, and a second purge gas supply port and a one-way valve are provided on the second purge gas supply pipeline. The one-way valve is arranged adjacent to the second purge gas supply port and is used to inject purge gas into the electrolytic cell and prevent hydrogen from discharging.

[0012] The present application also provides a control method for the electrolytic cell gas control system described above, including: Setting the lower limit of the operating power of the electrolytic cell as the first power, and the real-time required output power of the power supply as the second power. When the second power is less than the first power, controlling the electrolytic cell to shut down; otherwise, controlling the electrolytic cell to start; After the electrolytic cell starts, closing the first purge gas supply pipeline, opening the pure water supply pipeline to supply pure water to the electrolytic cell. After the pure water reacts on the anode side of the electrolytic cell, the oxygen output pipeline discharges the gas containing oxygen. The real-time hydrogen concentration of the gas in the oxygen output pipeline is detected by a hydrogen concentration detector, and the hydrogen output pipeline is opened to discharge hydrogen from the cathode side of the electrolytic cell; When the real-time hydrogen concentration is less than or equal to the preset hydrogen concentration limit value, controlling the first purge gas supply pipeline to close; when the real-time hydrogen concentration is greater than the preset hydrogen concentration limit value, controlling the first purge gas supply pipeline to open to inject purge gas into the electrolytic cell until the real-time hydrogen concentration is less than the preset hydrogen concentration limit value.

[0013] Further, the control method of the electrolytic cell gas control system further includes: After the electrolytic cell starts, closing the second purge gas supply pipeline, opening the second purge gas shunt pipeline to communicate with the hydrogen output pipeline to discharge hydrogen from the cathode side of the electrolytic cell; Setting the hydrogen concentration reset value to be less than the preset hydrogen concentration limit value, and setting the maximum purge duration threshold; when the real-time hydrogen concentration is greater than the preset hydrogen concentration limit value, resetting and starting the timer to record the purge time; When the hydrogen concentration detector detects that the real-time hydrogen concentration is less than the hydrogen concentration reset value, after closing the first purge gas supply pipeline to stop injecting purge gas into the electrolytic cell, opening the first purge gas shunt pipeline to shunt the purge gas and reduce the purge gas entering the electrolytic cell; When it is detected that the purge time is greater than the maximum purge duration threshold, controlling the electrolytic cell to shut down, closing the pure water supply pipeline, keeping the first purge gas supply pipeline open to continue injecting purge gas into the electrolytic cell, and when the hydrogen concentration detector detects that the real-time hydrogen concentration is less than the hydrogen concentration reset value, closing the first purge gas supply pipeline to stop injecting purge gas into the electrolytic cell; When the electrolytic cell shuts down, control the second purge gas diversion pipeline to close; when the hydrogen concentration detector detects that the real-time hydrogen concentration is less than the hydrogen concentration reset value, close the second purge gas diversion pipeline to stop injecting purge gas into the electrolytic cell, and open the second purge gas diversion pipeline to divert the purge gas, reducing the purge gas entering the electrolytic cell.

[0014] The electrolytic cell gas control system and its control method provided by the embodiments of the present application set a first purge gas supply pipeline on the pure water supply pipeline on the anode side of the electrolytic cell, and set a hydrogen concentration detector on the oxygen output pipeline on the anode side of the electrolytic cell to detect the real-time hydrogen concentration of the gas in the oxygen output pipeline. When the real-time hydrogen concentration is greater than the preset hydrogen concentration limit value, control the first purge gas supply pipeline to open and inject purge gas into the electrolytic cell until the real-time hydrogen concentration is less than the preset hydrogen concentration limit value, which can effectively control the hydrogen concentration of the gas in the oxygen output pipeline to extend the operation time of the electrolytic cell and can improve the low-load operation duration of the electrolytic cell. Description of the Drawings

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0016] Figure 1 It is a schematic structural diagram of the electrolytic cell gas control system provided by the embodiments of the present application.

[0017] The markings in the figure are as follows: Electrolytic cell 1, Anode side 11, Cathode side 12, Pure water supply pipeline 2, Pure water supply port 21, Oxygen output pipeline 3, Hydrogen output pipeline 4, Hydrogen concentration detector 5, First purge gas supply pipeline 6, First purge gas supply port 61, First purge gas diversion pipeline 7, First cut-off valve 71, Second purge gas supply pipeline 8, Second purge gas supply port 81, Check valve 82, Second purge gas diversion pipeline 9, Second cut-off valve 91. Detailed Embodiments

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0019] In the description of the present application, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0020] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection, or a connection capable of mutual communication; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0021] Please refer to Figure 1 , an electrolytic cell gas control system provided by an embodiment of the present application includes: An electrolytic cell 1, provided with an anode side 11 and a cathode side 12; A pure water supply pipeline 2, connected to the anode side 11, for supplying pure water into the electrolytic cell 1; An oxygen output pipeline 3, connected to the anode side 11, for discharging oxygen; A hydrogen output pipeline 4, connected to the cathode side 12, for discharging hydrogen; A hydrogen concentration detector 5, provided on the oxygen output pipeline 3, for detecting the real-time hydrogen concentration of the gas in the oxygen output pipeline 3; A first purge gas supply pipeline 6, connected to the pure water supply pipeline 2; when the real-time hydrogen concentration is less than or equal to a preset hydrogen concentration limit value, controlling the first purge gas supply pipeline 6 to close; when the real-time hydrogen concentration is greater than the preset hydrogen concentration limit value, controlling the first purge gas supply pipeline 6 to open and inject purge gas into the electrolytic cell 1 until the real-time hydrogen concentration is less than the preset hydrogen concentration limit value.

[0022] Preferably, the purge gas may be oxygen, air, or nitrogen.

[0023] In this application, a first purge gas supply pipeline 6 is provided on the pure water supply pipeline 2 on the anode side 11 of the electrolytic cell 1, and a hydrogen concentration detector 5 is provided on the oxygen output pipeline 3 on the anode side 11 of the electrolytic cell 1 to detect the real-time hydrogen concentration of the gas in the oxygen output pipeline 3. When the real-time hydrogen concentration is greater than the preset hydrogen concentration limit value, the first purge gas supply pipeline 6 is controlled to open to inject purge gas into the electrolytic cell 1 until the real-time hydrogen concentration is less than the preset hydrogen concentration limit value. It can effectively control the hydrogen concentration of the gas in the oxygen output pipeline 3 to extend the operation time of the electrolytic cell 1 and can improve the low-load operation duration of the electrolytic cell 1.

[0024] Please refer to Figure 1 , the pure water supply pipeline 2 is provided with a pure water supply port 21, and the first purge gas supply pipeline 6 is provided with a first purge gas supply port 61.

[0025] Please refer to Figure 1 , the electrolytic cell gas control system further includes: A control system, connected to the first purge gas supply pipeline 6, and a timer is provided in the control system; when the first purge gas supply pipeline 6 is controlled to open to inject purge gas into the electrolytic cell 1, the timer is reset and started to record the purge time; when it is detected that the purge time is greater than the maximum purge duration threshold, the electrolytic cell 1 is controlled to stop, the pure water supply pipeline 2 is closed, and the first purge gas supply pipeline 6 is kept open to continue injecting purge gas into the electrolytic cell 1. When the hydrogen concentration detector 5 detects that the real-time hydrogen concentration is less than the hydrogen concentration reset value, the first purge gas supply pipeline 6 is closed to stop injecting purge gas into the electrolytic cell 1.

[0026] To ensure the safety of the hydrogen production system, the preset hydrogen concentration limit value is set to be 5-20% less than the lower explosion limit concentration of hydrogen in oxygen. The hydrogen concentration reset value is set to be less than the preset hydrogen concentration limit value.

[0027] Please refer to Figure 1 , the electrolytic cell gas control system further includes: A first purge gas diversion pipeline 7, the two ends of which are respectively connected to the pure water supply pipeline 2 and the oxygen output pipeline 3; when the electrolytic cell 1 is started, the first purge gas diversion pipeline 7 is controlled to close; when the hydrogen concentration detector 5 detects that the real-time hydrogen concentration is less than the hydrogen concentration reset value, after the first purge gas supply pipeline 6 is closed to stop injecting purge gas into the electrolytic cell 1, the first purge gas diversion pipeline 7 is opened to make the purge gas divert, reducing the purge gas entering the electrolytic cell 1.

[0028] Among them, the first purge gas diversion pipeline 7 diverts the purge gas, reducing the amount of purge gas entering the electrolyzer 1 and preventing the electrolyzer 1 from being dried out, which affects the service life of the electrolyzer 1.

[0029] Please refer to Figure 1 , a first cut-off valve 71 is provided on the first purge gas diversion pipeline 7; the first end of the first purge gas diversion pipeline 7 is connected to the pure water supply pipeline 2 and is located downstream of the first purge gas supply pipeline 6, and the second end of the first purge gas diversion pipeline 7 is connected to the oxygen output pipeline 3 and is located downstream of the hydrogen concentration detector 5.

[0030] Please refer to Figure 1 , the electrolyzer gas control system further includes: A second purge gas supply pipeline 8, which is connected to the cathode side 12; when the electrolyzer 1 starts up, the second purge gas supply pipeline 8 is controlled to be closed; when the electrolyzer 1 shuts down, the second purge gas supply pipeline 8 is opened to inject purge gas into the electrolyzer 1.

[0031] Please refer to Figure 1 , the electrolyzer gas control system further includes: A second purge gas diversion pipeline 9, the two ends of which are respectively connected to the second purge gas supply pipeline 8 and the hydrogen output pipeline 4; when the electrolyzer 1 starts up, the second purge gas diversion pipeline 9 is controlled to be opened; when the electrolyzer 1 shuts down, the second purge gas diversion pipeline 9 is controlled to be closed; when the hydrogen concentration detector 5 detects that the real-time hydrogen concentration is less than the hydrogen concentration reset value, the second purge gas diversion pipeline 9 is closed to stop injecting purge gas into the electrolyzer 1, and the second purge gas diversion pipeline 9 is opened to divert the purge gas and reduce the purge gas entering the electrolyzer 1.

[0032] Among them, the second purge gas diversion pipeline 9 diverts the purge gas, reducing the amount of purge gas entering the electrolyzer 1 and preventing the electrolyzer 1 from being dried out, which affects the service life of the electrolyzer 1. When the electrolyzer 1 starts up, the second purge gas diversion pipeline 9 is opened, which can also increase the hydrogen passage into the hydrogen output pipeline 4.

[0033] Please refer to Figure 1 , a second cut-off valve 91 is provided on the second purge gas diversion pipeline 9, a second purge gas supply port 81 and a check valve 82 are provided on the second purge gas supply pipeline 8, the check valve 82 is arranged adjacent to the second purge gas supply port 81, and the check valve 82 is used to inject purge gas into the electrolyzer 1 and prevent hydrogen from discharging.

[0034] This application also provides a control method for the electrolyzer gas control system described above, including: Set the lower limit of the operating power of the electrolyzer 1 as the first power, and the real-time required output power of the power supply as the second power. When the second power is less than the first power, control the electrolyzer 1 to shut down; otherwise, control the electrolyzer 1 to start up; After the electrolyzer 1 starts up, close the first purge gas supply pipeline 6, open the pure water supply pipeline 2 to supply pure water to the electrolyzer 1. After the pure water reacts on the anode side 11 of the electrolyzer 1, the oxygen output pipeline 3 discharges the gas containing oxygen. The real-time hydrogen concentration of the gas in the oxygen output pipeline 3 is detected by the hydrogen concentration detector 5, and the hydrogen output pipeline 4 is opened to discharge hydrogen from the cathode side 12 of the electrolyzer 1; When the real-time hydrogen concentration is less than or equal to the preset hydrogen concentration limit value, control the first purge gas supply pipeline 6 to close; when the real-time hydrogen concentration is greater than the preset hydrogen concentration limit value, control the first purge gas supply pipeline 6 to open and inject purge gas into the electrolyzer 1 until the real-time hydrogen concentration is less than the preset hydrogen concentration limit value.

[0035] Furthermore, the control method of the electrolyzer gas control system further includes: After the electrolyzer 1 starts up, close the second purge gas supply pipeline 8, open the second purge gas shunt pipeline 9 to connect to the hydrogen output pipeline 4 to discharge hydrogen from the cathode side 12 of the electrolyzer 1; Set the hydrogen concentration reset value to be less than the preset hydrogen concentration limit value, and set the maximum purge duration threshold; when the real-time hydrogen concentration is greater than the preset hydrogen concentration limit value, reset and start the timer to record the purge time; When the hydrogen concentration detector 5 detects that the real-time hydrogen concentration is less than the hydrogen concentration reset value, after closing the first purge gas supply pipeline 6 to stop injecting purge gas into the electrolyzer 1, open the first purge gas shunt pipeline 7 to make the purge gas shunt and reduce the purge gas entering the electrolyzer 1; When it is detected that the purge time is greater than the maximum purge duration threshold, control the electrolyzer 1 to shut down, close the pure water supply pipeline 2, keep the first purge gas supply pipeline 6 open and continue to inject purge gas into the electrolyzer 1. When the hydrogen concentration detector 5 detects that the real-time hydrogen concentration is less than the hydrogen concentration reset value, close the first purge gas supply pipeline 6 to stop injecting purge gas into the electrolyzer 1; When the electrolyzer 1 shuts down, control the second purge gas shunt pipeline 9 to close; when the hydrogen concentration detector 5 detects that the real-time hydrogen concentration is less than the hydrogen concentration reset value, close the second purge gas shunt pipeline 9 to stop injecting purge gas into the electrolyzer 1, and open the second purge gas shunt pipeline 9 to make the purge gas shunt and reduce the purge gas entering the electrolyzer 1.

[0036] The electrolytic cell gas control system and its control method provided by the embodiments of the present application set a first purge gas supply pipeline 6 on the pure water supply pipeline 2 on the anode side 11 of the electrolytic cell 1, and set a hydrogen concentration detector 5 on the oxygen output pipeline 3 on the anode side 11 of the electrolytic cell 1 to detect the real-time hydrogen concentration of the gas in the oxygen output pipeline 3. When the real-time hydrogen concentration is greater than the preset hydrogen concentration limit value, control the first purge gas supply pipeline 6 to open to inject purge gas into the electrolytic cell 1 until the real-time hydrogen concentration is less than the preset hydrogen concentration limit value, which can effectively control the hydrogen concentration of the gas in the oxygen output pipeline 3 to extend the operation time of the electrolytic cell 1 and can improve the low-load operation duration of the electrolytic cell 1.

[0037] In the above embodiments, the descriptions of the respective embodiments have their own focuses. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0038] The above has introduced in detail an electrolytic cell gas control system and its control method provided by the embodiments of the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electrolytic cell gas control system, characterized in that: include: an electrolytic cell having an anode side and a cathode side; A pure water supply pipeline, connected to the anode side, for providing pure water to the electrolytic cell; an oxygen output pipeline, connected to the anode side, for discharging oxygen; A hydrogen output pipeline, connected to the cathode side, for discharging hydrogen; A hydrogen concentration detector, disposed on the oxygen output pipeline, for detecting the real-time hydrogen concentration of the gas in the oxygen output pipeline; a first purge gas supply pipeline connected to the pure water supply pipeline; when the real-time hydrogen concentration is less than or equal to a preset hydrogen concentration limit, the first purge gas supply pipeline is controlled to be closed; when the real-time hydrogen concentration is greater than the preset hydrogen concentration limit, the first purge gas supply pipeline is controlled to be opened to inject purge gas into the electrolyzer until the real-time hydrogen concentration is less than the preset hydrogen concentration limit.

2. The electrolyzer gas control system according to claim 1, characterized in that: The pure water supply pipeline is provided with a pure water supply port, and the first purge gas supply pipeline is provided with a first purge gas supply port.

3. The electrolyzer gas control system according to claim 1, characterized in that: Also includes: A control system is connected to the first purge gas supply pipeline, and a timer is provided in the control system; when the first purge gas supply pipeline is controlled to be opened to inject purge gas into the electrolyzer, the timer is reset and started to record the purge time; when it is detected that the purge time is greater than a maximum purge time threshold, the electrolyzer is controlled to shut down, the pure water supply pipeline is closed, the first purge gas supply pipeline is kept open to continue injecting purge gas into the electrolyzer, and when the hydrogen concentration detector detects that the real-time hydrogen concentration is less than a hydrogen concentration reset value, the first purge gas supply pipeline is closed to stop injecting purge gas into the electrolyzer.

4. The electrolyzer gas control system according to claim 3, characterized in that: Also includes: A first purge gas diversion pipeline, two ends of which are respectively connected to the pure water supply pipeline and the oxygen output pipeline; When the electrolyzer is started, the first purge gas diversion pipeline is controlled to be closed; when the hydrogen concentration detector detects that the real-time hydrogen concentration is less than the hydrogen concentration reset value, after closing the first purge gas supply pipeline to stop injecting purge gas into the electrolyzer, the first purge gas diversion pipeline is opened to divert the purge gas, thereby reducing the purge gas entering the electrolyzer.

5. The electrolyzer gas control system according to claim 4, characterized in that: A first shut-off valve is provided on the first purge gas diversion pipeline; a first end of the first purge gas diversion pipeline is connected to the pure water supply pipeline and is located downstream of the first purge gas supply pipeline, and a second end of the first purge gas diversion pipeline is connected to the oxygen output pipeline and is located downstream of the hydrogen concentration detector.

6. The electrolyzer gas control system according to claim 3, characterized in that: Also includes: a second purge gas supply pipeline connected to the cathode side; when the electrolytic cell is started, the second purge gas supply pipeline is controlled to be closed; When the electrolytic cell is shut down, the second purge gas supply pipeline is opened to inject purge gas into the electrolytic cell.

7. The electrolyzer gas control system according to claim 6, characterized in that: Also includes: a second purge gas shunt pipeline, whose two ends are respectively connected to the second purge gas supply pipeline and the hydrogen output pipeline; when the electrolyzer is started, the second purge gas shunt pipeline is controlled to be opened; when the electrolyzer is shut down, the second purge gas shunt pipeline is controlled to be closed; when the hydrogen concentration detector detects that the real-time hydrogen concentration is less than the hydrogen concentration reset value, the second purge gas shunt pipeline is closed to stop injecting purge gas into the electrolyzer, and the second purge gas shunt pipeline is opened to divert the purge gas, thereby reducing the purge gas entering the electrolyzer.

8. The electrolyzer gas control system according to claim 7, characterized in that: A second shut-off valve is provided on the second purge gas diversion pipeline, and a second purge gas supply port and a one-way valve are provided on the second purge gas supply pipeline. The one-way valve is arranged adjacent to the second purge gas supply port, and the one-way valve is used to inject purge gas into the electrolytic cell and prevent hydrogen from being discharged.

9. A control method for an electrolytic cell gas control system according to any one of claims 1 to 8, characterized in that: include: The lower limit of the operating power of the electrolytic cell is set to a first power, and the real-time required output power of the power supply is set to a second power. When the second power is less than the first power, the electrolytic cell is controlled to stop, otherwise, the electrolytic cell is controlled to start; When the electrolyzer is started, the first purge gas supply pipeline is closed, and the pure water supply pipeline is opened to provide pure water to the electrolyzer, and after the pure water reacts on the anode side of the electrolyzer, the oxygen output pipeline discharges gas containing oxygen, and the real-time hydrogen concentration of the gas in the oxygen output pipeline is detected by a hydrogen concentration detector, and the hydrogen output pipeline is opened to discharge hydrogen from the cathode side of the electrolyzer; When the real-time hydrogen concentration is less than or equal to the preset hydrogen concentration limit, the first purge gas supply pipeline is controlled to be closed; when the real-time hydrogen concentration is greater than the preset hydrogen concentration limit, the first purge gas supply pipeline is controlled to be opened to inject purge gas into the electrolyzer until the real-time hydrogen concentration is less than the preset hydrogen concentration limit.

10. The control method of the electrolytic cell gas control system according to claim 9, characterized in that: Also includes: When the electrolyzer is started, the second purge gas supply pipeline is closed, and the second purge gas diversion pipeline is opened to connect to the hydrogen output pipeline so that hydrogen is discharged from the cathode side of the electrolyzer; The hydrogen concentration reset value is set to be less than the preset hydrogen concentration limit, and the maximum purge time threshold is set; when the real-time hydrogen concentration is greater than the preset hydrogen concentration limit, the timer is reset and started to record the purge time; When the hydrogen concentration detector detects that the real-time hydrogen concentration is less than the hydrogen concentration reset value, after closing the first purge gas supply pipeline to stop injecting purge gas into the electrolyzer, the first purge gas diversion pipeline is opened to divert the purge gas, thereby reducing the purge gas entering the electrolyzer; When it is detected that the purge time is greater than the maximum purge time threshold, the electrolytic cell is controlled to stop, the pure water supply pipeline is closed, the first purge gas supply pipeline is kept open to continue injecting purge gas into the electrolytic cell, and when the hydrogen concentration detector detects that the real-time hydrogen concentration is less than the hydrogen concentration reset value, the first purge gas supply pipeline is closed to stop injecting purge gas into the electrolytic cell; When the electrolyzer is shut down, the second purge gas shunt pipeline is controlled to be closed; when the hydrogen concentration detector detects that the real-time hydrogen concentration is less than the hydrogen concentration reset value, the second purge gas shunt pipeline is closed to stop injecting purge gas into the electrolyzer, and the second purge gas shunt pipeline is opened to divert the purge gas, thereby reducing the purge gas entering the electrolyzer.

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