A control method of a ship ballast water treatment system with a pressurized hydrogen removal electrolysis system

Abstract

This invention discloses a control method for a pressurized hydrogen removal electrolysis system in a ship ballast water treatment system. The method includes: injecting seawater into an electrolysis cell via a booster pump; the resulting gas-liquid mixture entering a cyclone separator through an inlet pipe for pressurized gas-liquid separation; monitoring the liquid level in the cyclone separator in real time using a level gauge; and automatically interlocking control by adjusting the opening of the automatic hydrogen regulating valve on the hydrogen discharge pipe and the automatic chemical dosing valve on the chemical dosing pipe, thereby maintaining the pressurized pressure range within the cyclone separator at 2-7 bar. Compared with existing technologies, the advantages of this invention are: its control logic is simple, its safety and reliability are high, and the hardware does not require buffer tanks, variable frequency chemical dosing devices, etc., offering advantages such as fewer devices, smaller size, and higher reliability.

Description

Technical Field

[0001] This invention belongs to the field of marine environmental engineering technology, specifically relating to a control method for a pressurized hydrogen removal electrolysis system in a ship ballast water treatment system. Background Technology

[0002] Electrolysis-based ballast water management systems are a crucial method in ship ballast water treatment technology, holding a significant market share. Among electrolysis methods, branch line electrolysis offers substantial advantages for ballast water treatment in large vessels. Branch line electrolysis involves taking a small amount of seawater from the ship's main pipeline for electrolysis, separating the byproduct hydrogen gas from the electrolytic disinfectant solution, and then reinjecting the electrolyte into the main pipeline. The disinfectant solution generated during electrolysis disinfects and sterilizes the ballast water. The core equipment of branch line electrolysis is the electrolysis unit. Currently, the electrolysis unit in branch line electrolysis technology uses a cyclone separator to separate hydrogen gas from the sodium hypochlorite solution, depressurizes it, and then uses a variable frequency dosing device to extract the sodium hypochlorite solution and inject it into the ballast water main pipeline, thereby inactivating microorganisms in the seawater in the main pipeline.

[0003] Currently, electrolytic hydrogen removal units are atmospheric pressure systems, requiring large-volume buffer tanks, variable frequency dosing devices, etc., which have disadvantages such as large size, many devices, and low reliability. Summary of the Invention

[0004] Details of one or more embodiments of the present invention are set forth in the following drawings and description to make other features, objects and advantages of the present application more readily apparent.

[0005] This invention provides a control method for a pressurized hydrogen removal electrolysis system in a ship ballast water treatment system. The control method has simple logic, high safety and reliability, and the hardware does not require the configuration of buffer tanks, variable frequency dosing devices, etc., which has the advantages of fewer devices, small size, and high reliability.

[0006] This invention discloses a control method for a pressurized hydrogen removal electrolysis system in a ship ballast water treatment system, comprising:

[0007] Seawater is injected into the electrolyzer via a booster pump. The resulting gas-liquid mixture enters the cyclone separator through the inlet pipe for pressurized gas-liquid separation. The liquid level in the cyclone separator is monitored in real time by a level gauge. Automatic interlocking control is achieved by adjusting the opening of the hydrogen automatic regulating valve on the hydrogen discharge line and the chemical dosing automatic regulating valve on the chemical dosing line of the cyclone separator, thereby maintaining the pressurized pressure range in the cyclone separator between 2 and 7 bar.

[0008] In some implementations, the hydrogen separated by the cyclone separator is regulated by an automatic hydrogen regulating valve on the hydrogen discharge pipeline to keep the hydrogen flow rate within the range of 0.5-15 m / s.

[0009] In some implementations, an explosion-proof fan is connected to the hydrogen exhaust pipeline, and a hydrogen sensor and a pressure switch are installed between the hydrogen exhaust pipeline and the explosion-proof fan. The hydrogen sensor is used to detect the concentration of hydrogen in the hydrogen exhaust pipeline, and then the explosion-proof fan is used to inject gas to dilute the concentration of hydrogen, so as to ensure that the concentration of hydrogen discharged from the hydrogen exhaust pipeline meets the safety specifications.

[0010] In some implementations, two explosion-proof fans are configured and connected in parallel to form a standby configuration.

[0011] In some implementations, the liquid level in the cyclone separator is adjusted by setting 5 control points within the range of the liquid level gauge.

[0012] The low liquid level alarm is set to 5%-15% of the liquid level metering range, at which point the system will alarm and shut down.

[0013] The low and medium liquid level alarm is set to 15%-25% of the liquid level metering range, and the system will not stop shutting down when the alarm is triggered.

[0014] The intermediate stability point is set at 50±5% of the liquid level metering range, and the system will not alarm or stop.

[0015] The high liquid level alarm is set to 75%-85% of the liquid level metering range, and the system will not shut down when the alarm is triggered.

[0016] The high-high liquid level alarm is set to 85%-95% of the liquid level metering range, at which point the system will alarm and shut down.

[0017] When the liquid level metering range is between the middle stable point and the low liquid level alarm, the lower the liquid level, the larger the valve opening. The adjustment range of the automatic hydrogen regulating valve on the hydrogen discharge pipeline is 1%-5%, and the adjustment increment is 1%-2% each time.

[0018] When the liquid level metering range is between the middle stable point and the high liquid level alarm, the higher the liquid level, the smaller the valve opening. The adjustment range of the automatic hydrogen regulating valve on the hydrogen discharge pipeline is 1%-5%, and the adjustment increment is 1%-2% each time.

[0019] When the liquid level metering range is at the middle stable point, the state of the automatic hydrogen regulating valve on the hydrogen discharge pipeline remains unchanged.

[0020] In some implementations, the electrolytic cell is started up as follows:

[0021] The booster pump starts, and seawater enters the electrolytic cell through the automatic inlet regulating valve, flow meter, conductivity meter, and pressure sensor PT21, and then enters the cyclone separator;

[0022] When the pressure of pressure sensor PT21 or pressure of pressure sensor PT22 at the dosing line reaches 1-2 bar, or the range of the level gauge reaches 60%-90%, the automatic dosing regulating valve of the dosing line will open.

[0023] When the flow meter and conductivity meter reach the set values ​​and the air pressure switch signal is stable, the electrolytic cell starts to be electrolyzed by DC power, and the automatic water inlet regulating valve is adjusted by the flow meter to ensure that the water inlet flow of the electrolytic cell is stable at the rated flow.

[0024] In some implementations, the method for stopping the electrolytic cell is as follows:

[0025] The DC electrolysis in the electrolytic cell stops, and the booster pump continues to supply water to stabilize the liquid level in the cyclone separator until the high-concentration sodium hypochlorite solution in the electrolytic cell and cyclone separator is replaced with seawater. Then, the booster pump stops, the automatic water inlet regulating valve and the automatic chemical dosing regulating valve are closed, and the explosion-proof fan continues to inject gas to dilute the hydrogen concentration until the hydrogen in the hydrogen discharge pipeline is emptied. Finally, the automatic hydrogen regulating valve and the explosion-proof fan are closed.

[0026] In some implementations, the method for adjusting the opening of the automatic dosing regulating valve is as follows:

[0027] After electrolysis begins, when the hydrogen automatic regulating valve opens and the liquid level in the cyclone separator continues to drop, the opening of the dosing automatic regulating valve decreases. The faster the liquid level drops, the larger the adjustment range of the automatic regulating valve, with a single adjustment range of 1%-5% and an adjustment frequency of once every 2-10 seconds. When the hydrogen automatic regulating valve closes and the liquid level in the cyclone separator continues to rise, the opening of the dosing automatic regulating valve increases. The faster the liquid level rises, the larger the adjustment range of the dosing automatic regulating valve, with a single adjustment range of 1%-5% and an adjustment frequency of once every 2-10 seconds, to ensure the stability of the liquid level in the cyclone separator.

[0028] In some implementations, the hydrogen production rate of the electrolyzer is 2.5-20% of the electrolyzer inlet water flow rate.

[0029] In some implementations, the initial opening of the hydrogen automatic control valve and the chemical dosing automatic control valve is 50% of their maximum opening.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] 1. An innovative design transforms the traditional atmospheric cyclone separator into a pressurized cyclone separator, with the pressure parameters set within a range of 2-7 bar to meet the basic design specifications of all existing ship structures. Specific pressure parameters are adjusted based on the ship's specifications and operational experience. The pressure in the pressurized cyclone separator originates entirely from a booster pump injected with seawater at the front end. This eliminates the need for subsequent buffer tanks and pump sets, allowing the separated sodium hypochlorite to be pumped directly to the ballast water main for inactivation and sterilization. This significantly optimizes the hardware components and control logic of the overall control system, making control more convenient and response more reliable.

[0032] 2. Based on the above main logic framework, further designs were made for the liquid level adjustment method in the cyclone separator, the start-up and shutdown method of the electrolytic cell, and the dosing adjustment method of the automatic dosing regulating valve. A rapid chain reaction linkage between multiple modules was formed, which not only ensures the safety and controllability of the system, but also makes it more stable, thereby achieving efficient control operation. Attached Figure Description

[0033] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0034] Figure 1 This is a schematic diagram of the pressurized hydrogen removal electrolysis system of the ship ballast water treatment system of the present invention.

[0035] Figure 2 This is a schematic diagram of the electrolysis start-up process of the present invention.

[0036] Figure 3 This is a schematic diagram of the electrolysis shutdown process of the present invention.

[0037] Figure descriptions: 1. Electrolytic cell; 2. Temperature sensor; 3. Automatic hydrogen regulating valve; 4. Gas-water separator valve; 5. Hydrogen sensor; 6. Air pressure switch; 7. Explosion-proof fan; 8. Pressure sensor; 9. Level gauge; 10. Cyclone separator; 11. Conductivity meter; 12. Flow meter; 13. Pressure sensor; 14. Automatic dosing regulating valve; 15. Automatic water inlet regulating valve; 16. Booster pump. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. All other embodiments obtained by those skilled in the art based on the embodiments provided by this invention without inventive effort are within the scope of protection of this invention.

[0039] Obviously, the accompanying drawings described below are merely some examples or embodiments of the present invention. Those skilled in the art can apply the present invention to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this invention, modifications to design, manufacturing, or production based on the technical content disclosed in this invention are merely conventional technical means and should not be construed as insufficient disclosure of the present invention.

[0040] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention may be combined with other embodiments without conflict.

[0041] Combination Figure 1 Its specific control system includes:

[0042] A booster pump 16, an electrolytic cell 1, and a cyclone separator 10 are sequentially connected, along with corresponding inlet water pipes, hydrogen discharge pipes, chemical dosing pipes, and a level gauge 9. The cyclone separator 10 separates sodium hypochlorite solution and hydrogen gas. The inlet water pipe is connected to the cyclone separator 10 and tangential to its side cylinder. The inlet water pipe transports the solution containing sodium hypochlorite and hydrogen gas from the electrolytic cell 1 to the cylinder of the cyclone separator 10. The hydrogen discharge pipe is connected to the top of the cyclone separator 10 and is equipped with an automatic hydrogen regulating valve 3. The hydrogen discharge pipe passes through the cyclone separator 10... The separated hydrogen is output; level gauge 9 is connected to cyclone separator 10 to monitor the liquid level inside cyclone separator 10; the bottom of cyclone separator 10 is connected to the ballast water main pipeline via a chemical dosing pipeline, and the sodium hypochlorite solution separated by cyclone separator 10 flows into the ballast water main pipeline to inactivate microorganisms in the pipeline; automatic hydrogen regulating valve 3 and automatic chemical dosing regulating valve 14 are connected to level gauge 9, and the opening degree of automatic hydrogen regulating valve 3 and automatic chemical dosing regulating valve 14 is adjusted according to the data monitored by level gauge 9 to control the pressure inside the cylinder of cyclone separator 10 at 2-7 bar. Furthermore, a temperature sensor 2 is also installed on the inlet pipeline. The parameter setting of 2-7 bar can meet the working condition design requirements under the existing ship structure. The pressure setting requirements of ships of different sizes and specifications are different, and the specific differences can be adjusted according to working condition experience. Current technology uses a cyclone separator 10 to separate hydrogen from sodium hypochlorite solution, depressurize and store it in a buffer tank, and then inject the sodium hypochlorite solution into the main pipeline via a dosing unit to inactivate microorganisms in the seawater in the main pipeline. However, this system has many modules, increasing the risk of malfunctions during operation. To simplify the system, upgrades are needed to improve its reliability. The present invention, through structural design and control of flow rate, pressure, and hydrogen flow rate, ensures complete separation of hydrogen and sodium hypochlorite solution. Simultaneously, a regulating valve ensures that the pressurized sodium hypochlorite solution discharged from the cyclone separator 10 enters the main pipeline directly, eliminating the need for depressurization, buffer tank storage, and injection of sodium hypochlorite solution into the main pipeline via a dosing unit. This ensures efficient separation of hydrogen and sodium hypochlorite solution while simplifying the device structure and process.Specifically, the inlet pipe of the cyclone separator 10 is tangential to the cylinder body, causing the incoming water to form a vortex, achieving the purpose of separating hydrogen. Its hydrogen outlet is equipped with an automatic hydrogen regulating valve 3 and a gas-water separator. Pressurized seawater is electrolyzed by the electrolytic cell 1 into a mixed solution of sodium hypochlorite and hydrogen, which enters the cyclone separator 10. A vortex is formed in the solution in the cyclone separator 10, and hydrogen accumulates at the top of the cyclone separator 10. A hydrogen discharge pipe is installed at the top of the cyclone separator 10, and the hydrogen is discharged after being diluted to a safe concentration by the explosion-proof fan 7. The automatic hydrogen regulating valve 3 stabilizes the discharge of hydrogen by adjusting the valve opening, ensuring that the liquid level in the cyclone separator 10 is stable within a certain range. The sodium hypochlorite solution is discharged through the chemical dosing pipe of the cyclone separator 10, realizing the direct injection of the pressurized sodium hypochlorite solution produced after hydrogen removal by the electrolytic device into the ballast water main pipeline.

[0043] In conjunction with the above-mentioned control system, this invention discloses a control method for a pressurized hydrogen removal electrolysis system in a ship ballast water treatment system, comprising:

[0044] Seawater is injected into the electrolysis cell 1 via a booster pump 16. The electrolyzed gas-liquid mixture enters the cyclone separator 10 through the water inlet pipe for pressurized gas-liquid separation. The liquid level in the cyclone separator 10 is monitored in real time by a level gauge 9. Automatic interlocking control is achieved by adjusting the opening of the hydrogen automatic regulating valve 3 on the hydrogen discharge pipe and the chemical dosing automatic regulating valve 14 on the chemical dosing pipe of the cyclone separator 10 in real time, thereby keeping the pressurized pressure range in the cyclone separator 10 between 2-7 bar.

[0045] Specifically, the hydrogen separated by the cyclone separator 10 is regulated by the automatic hydrogen regulating valve 3 on the hydrogen discharge pipeline to keep the hydrogen flow rate within the range of 0.5-15 m / s. The hydrogen production of the electrolyzer 1 is 2.5-20% of the influent flow rate of the electrolyzer 1.

[0046] By setting the parameters mentioned above, the gas release rate is ensured to be lower than the hydrogen production rate, thus ensuring the pressurized state. This, combined with the above system and method, reduces system cost and improves system reliability.

[0047] In some embodiments, an explosion-proof fan 7 is connected externally to the hydrogen exhaust pipeline, and a hydrogen sensor 5 and a pressure switch 6 are installed between the hydrogen exhaust pipeline and the explosion-proof fan 7. The hydrogen sensor 5 detects the concentration of hydrogen in the hydrogen exhaust pipeline, and then the explosion-proof fan 7 injects gas to dilute the hydrogen concentration, ensuring that the concentration of hydrogen discharged from the hydrogen exhaust pipeline meets safety regulations. Specifically, two explosion-proof fans 7 are configured and connected in parallel to form a standby configuration.

[0048] In some embodiments, the method for adjusting the liquid level inside the cyclone separator 10 is as follows: five control points are set within the range of the level gauge 9.

[0049] The low liquid level alarm is set to 5%-15% of the liquid level gauge's range, at which point the system will alarm and shut down.

[0050] The low and medium liquid level alarm is set to 15%-25% of the liquid level gauge's range 9, and the system will not shut down when an alarm is triggered.

[0051] The intermediate stable point is set to 50±5% of the level gauge's 9-range, and the system will not alarm or stop.

[0052] The high liquid level alarm is set to 75%-85% of the liquid level gauge's range; the system will not shut down when an alarm is triggered.

[0053] The high-high liquid level alarm is set to 85%-95% of the liquid level gauge's 9-range, at which point the system will alarm and shut down.

[0054] When the level gauge 9 is between the middle stable point and the low liquid level alarm, the lower the liquid level, the larger the valve opening. The adjustment range of the hydrogen automatic regulating valve 3 on the hydrogen discharge pipeline is 1%-5%, and the adjustment increment is 1%-2% each time.

[0055] When the level gauge 9 is between the middle stable point and the high level alarm, the higher the liquid level, the smaller the valve opening. The adjustment range of the automatic hydrogen regulating valve 3 on the hydrogen discharge pipeline is 1%-5%, and the adjustment increment is 1%-2% each time.

[0056] When the level gauge 9 is at the middle stable point, the state of the hydrogen automatic regulating valve 3 on the hydrogen discharge pipeline remains unchanged.

[0057] In some embodiments, the method for starting the electrolytic cell is as follows:

[0058] When the booster pump 16 is started, seawater enters the electrolytic cell 1 through the automatic inlet regulating valve 15, flow meter 12, conductivity meter 11, and pressure sensor PT21 13, and then enters the cyclone separator 1.

[0059] When the pressure of pressure sensor PT21 or pressure of pressure sensor PT22 at the dosing line reaches 1-2 bar, or the range of level gauge 9 reaches 60%-90%, the automatic dosing regulating valve 14 of the dosing line will open.

[0060] When the flow meter 12 and conductivity meter 11 reach the set value and the air pressure switch 6 signal is stable, the electrolytic cell 1 starts to be electrolyzed by DC power, and the automatic water inlet regulating valve 15 is adjusted by the flow meter 12 to ensure that the water inlet flow of the electrolytic cell 1 is stable at the rated flow.

[0061] In some embodiments, the method for stopping the electrolytic cell is as follows:

[0062] When the DC electrolysis in electrolytic cell 1 stops, the booster pump 16 continues to supply water to stabilize the liquid level in the cyclone separator 10 until the high-concentration sodium hypochlorite solution in electrolytic cell 1 and cyclone separator 10 is replaced with seawater. Then, the booster pump 16 stops, the automatic water inlet regulating valve 15 and the automatic chemical dosing regulating valve 14 are closed, and the explosion-proof fan 7 continues to inject gas to dilute the concentration of hydrogen until the hydrogen in the hydrogen discharge pipeline is emptied. Then, the automatic hydrogen regulating valve 3 and the explosion-proof fan 7 are closed.

[0063] For example, after the DC electrolysis of electrolytic cell 1 stops, the booster pump 16 continues to supply water for 30 seconds to ensure the stability of the liquid level; later, the hydrogen automatic regulating valve 3 closes after a delay of 10 minutes so that the residual hydrogen in the system's hydrogen discharge pipeline can be vented by the explosion-proof fan 7.

[0064] In some embodiments, the method for adjusting the opening of the automatic dosing regulating valve 14 is as follows:

[0065] After electrolysis begins in the electrolyzer, when the automatic hydrogen regulating valve 3 opens and the liquid level in the cyclone separator 10 continues to drop, the opening of the automatic chemical dosing regulating valve 14 decreases. The faster the liquid level drops, the larger the adjustment range of the automatic regulating valve 14, with a single adjustment range of 1%-5% and an adjustment frequency of once every 2-10 seconds. When the automatic hydrogen regulating valve 3 closes and the liquid level in the cyclone separator 10 continues to rise, the opening of the automatic chemical dosing regulating valve 14 increases. The faster the liquid level rises, the larger the adjustment range of the automatic chemical dosing regulating valve 14, with a single adjustment range of 1%-5% and an adjustment frequency of once every 2-10 seconds, to ensure the stability of the liquid level within the cyclone separator 10. When the influent flow rate and the liquid level in the cyclone separator are stable, the system's chemical dosing stability can be guaranteed. This control scheme can ensure the stability of chemical dosing even when the system's back pressure is constantly changing.

[0066] In the above embodiments, the initial opening degree of the hydrogen automatic regulating valve 3 and the chemical dosing automatic regulating valve 14 is 50% of their maximum opening degree. This facilitates the overall up and down control of the valves.

[0067] In summary, during operation, the entire system ensures that the inlet flow rate of electrolyzer 1 is kept stable at the rated flow rate by adjusting the automatic water inlet regulating valve 15. The interlocking control of the automatic hydrogen regulating valve 3 and the level gauge 9 ensures that the liquid level in the cyclone separator 10 is relatively stable, thereby achieving a pressure-maintaining effect. The interlocking control of the automatic hydrogen regulating valve 3 and the automatic chemical dosing regulating valve 14 ensures the stability of chemical dosing. When the liquid level cannot be stabilized during the normal hydrogen discharge process of the automatic hydrogen regulating valve 3, the automatic chemical dosing regulating valve 14 can be used for overall control.

[0068] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for a pressurized hydrogen removal electrolysis system in a ship ballast water treatment system, characterized in that, include: Seawater is injected into the electrolytic cell via a booster pump. The resulting gas-liquid mixture enters the cyclone separator through the inlet pipe for pressurized gas-liquid separation. The hydrogen discharge pipeline is connected to the top of the cyclone separator, and the hydrogen discharge pipeline is equipped with an automatic hydrogen regulating valve and an air pressure switch; the bottom of the cyclone separator is connected to the ballast water main pipeline through a chemical dosing pipeline. The booster pump starts, and seawater enters the electrolytic cell through the automatic inlet regulating valve, flow meter, conductivity meter, and pressure sensor PT21. When the pressure of pressure sensor PT21 or pressure of pressure sensor PT22 at the dosing line reaches 1-2 bar, or the range of the level gauge reaches 60%-90%, the automatic dosing regulating valve of the dosing line will open. When the flow meter and conductivity meter reach the set values ​​and the air pressure switch signal is stable, the electrolytic cell starts to be electrolyzed by DC power, and the automatic water inlet regulating valve is adjusted by the flow meter to ensure that the water inlet flow of the electrolytic cell is stable at the rated flow. The gas-liquid mixture after electrolysis enters the cyclone separator through the water inlet pipeline for pressurized gas-liquid separation. The liquid level in the cyclone separator is monitored in real time by a level gauge. The opening of the hydrogen automatic regulating valve in the hydrogen discharge pipeline and the chemical dosing automatic regulating valve in the chemical dosing pipeline on the cyclone separator are adjusted in real time to achieve automatic interlock control, so that the pressure range in the cyclone separator is 2-7 bar.

2. The control method according to claim 1, characterized in that, The hydrogen separated by the cyclone separator is regulated by an automatic hydrogen regulating valve on the hydrogen discharge pipeline to keep the hydrogen flow rate within the range of 0.5-15 m / s.

3. The control method according to claim 1, characterized in that, An explosion-proof fan is connected to the hydrogen exhaust pipeline, and a hydrogen sensor and a pressure switch are installed between the hydrogen exhaust pipeline and the explosion-proof fan. The hydrogen sensor detects the concentration of hydrogen in the hydrogen exhaust pipeline, and then the explosion-proof fan injects gas to dilute the concentration of hydrogen, so as to ensure that the concentration of hydrogen discharged from the hydrogen exhaust pipeline meets the safety specifications.

4. The control method according to claim 3, characterized in that, Two explosion-proof fans are set up and connected in parallel to form a backup fan.

5. The control method according to claim 1, characterized in that, The method for adjusting the liquid level inside the cyclone separator is as follows: set 5 control points within the range of the liquid level gauge; The low liquid level alarm is set to 5%-15% of the liquid level metering range, at which point the system will alarm and shut down. The low and medium liquid level alarm is set to 15%-25% of the liquid level metering range, and the system will not stop shutting down when the alarm is triggered. The intermediate stability point is set to 50±5% of the liquid level metering range, and the system will not alarm or stop. The high liquid level alarm is set to 75%-85% of the liquid level metering range, and the system will not shut down when the alarm is triggered. The high-high liquid level alarm is set to 85%-95% of the liquid level metering range, at which point the system will alarm and shut down. When the liquid level metering range is between the middle stable point and the low liquid level alarm, the lower the liquid level, the larger the valve opening. The adjustment range of the automatic hydrogen regulating valve on the hydrogen discharge pipeline is 1%-5%, and the adjustment increment is 1%-2% each time. When the liquid level metering range is between the intermediate stable point and the high liquid level alarm, the higher the liquid level, the smaller the valve opening. The adjustment range of the automatic hydrogen regulating valve on the hydrogen discharge pipeline is 1%-5%, and the adjustment increment is 1%-2% each time. When the liquid level metering range is at the middle stable point, the state of the automatic hydrogen regulating valve on the hydrogen discharge pipeline remains unchanged.

6. The control method according to claim 3, characterized in that, The method for stopping an electrolytic cell is as follows: The DC electrolysis in the electrolytic cell stops, and the booster pump continues to supply water to stabilize the liquid level in the cyclone separator until the high-concentration sodium hypochlorite solution in the electrolytic cell and cyclone separator is replaced with seawater. Then, the booster pump stops, the automatic water inlet regulating valve and the automatic chemical dosing regulating valve are closed, and the explosion-proof fan continues to inject gas to dilute the hydrogen concentration until the hydrogen in the hydrogen discharge pipeline is emptied. Finally, the automatic hydrogen regulating valve and the explosion-proof fan are closed.

7. The control method according to claim 1, characterized in that, The method for adjusting the opening of the automatic dosing regulating valve is as follows: After electrolysis begins, when the hydrogen automatic regulating valve opens and the liquid level in the cyclone separator continues to drop, the opening of the dosing automatic regulating valve decreases. The faster the liquid level drops, the larger the adjustment range of the automatic regulating valve, with a single adjustment range of 1%-5% and an adjustment frequency of once every 2-10 seconds. When the hydrogen automatic regulating valve closes and the liquid level in the cyclone separator continues to rise, the opening of the dosing automatic regulating valve increases. The faster the liquid level rises, the larger the adjustment range of the dosing automatic regulating valve, with a single adjustment range of 1%-5% and an adjustment frequency of once every 2-10 seconds, to ensure the stability of the liquid level in the cyclone separator.

8. The control method according to claim 1, characterized in that, The hydrogen production rate of the electrolyzer is 2.5-20% of the influent flow rate of the electrolyzer.

9. The control method according to claim 1, characterized in that, The initial opening degree of the hydrogen automatic regulating valve and the chemical dosing automatic regulating valve is 50% of their maximum opening degree.

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