Hydrogen production system

Abstract

The application discloses a hydrogen production system and belongs to the technical field of hydrogen production by water electrolysis. The hydrogen production system is applied to hydrogen production by water electrolysis and comprises at least one electrolytic tank, a circulating assembly, a gas-liquid separator and an electrolyte buffer, wherein the outlet of the circulating assembly is connected with the liquid inlet of the electrolytic tank; the inlet of the gas-liquid separator is connected with the outlet of the electrolytic tank; the inlet of the electrolyte buffer is connected with the outlet of the electrolytic tank; wherein the inlet of one of the gas-liquid separator and the electrolyte buffer is communicated with the outlet of the electrolytic tank, and the liquid return inlet of the gas-liquid separator and the outlet of the electrolyte buffer are both connected with the inlet of the circulating assembly. In the technical scheme, the electrolyte circulating loop, which is communicated with the gas-liquid separator and the electrolyte buffer, is constructed, so that useless work of a multiple-electrolytic-tank system in parallel connection during start-up can be reduced, the product quality of hydrogen production is helped to be enhanced, and the adaptability of the system to a wide power under new energy power input is helped to be enhanced.

Description

Technical Field

[0001] This application belongs to the field of water electrolysis for hydrogen production technology, and particularly relates to a hydrogen production system. Background Technology

[0002] In the scenario of green electricity to produce hydrogen, there is a fluctuation in the power generation of new energy sources, which results in a lot of wasted power when the parallel multi-electrolyzer system starts up, leaving room for improvement. Summary of the Invention

[0003] This application aims to at least address the technical problem of excessive wasted power during startup in parallel multi-electrolyzer systems in related technologies. To this end, this application proposes a hydrogen production system that can reduce wasted power during startup, thereby enhancing the system's adaptability to a wide power range under renewable energy input.

[0004] In a first aspect, this application provides a hydrogen production system for use in water electrolysis to produce hydrogen, comprising:

[0005] At least one electrolytic cell;

[0006] The circulation component has its outlet connected to the inlet of the electrolytic cell;

[0007] The gas-liquid separator has its inlet connected to the outlet of the electrolytic cell;

[0008] An electrolyte buffer, the inlet of which is connected to the outlet of the electrolytic cell; wherein,

[0009] The inlet of one of the gas-liquid separator and the electrolyte buffer is connected to the outlet of the electrolytic cell, and the return port of the gas-liquid separator and the outlet of the electrolyte buffer are both connected to the inlet of the circulation component.

[0010] In the above technical solution, by constructing an electrolyte circulation loop that connects the electrolyzer to the gas-liquid separator and the electrolyte buffer respectively, the wasted energy during the start-up of the parallel multi-electrolyzer system can be reduced, which helps to improve the product quality of hydrogen production and enhance the system's adaptability to a wide range of power inputs from new energy sources.

[0011] According to one embodiment of this application, the hydrogen production system includes a first operating mode in which the outlet of the electrolyzer is connected to the inlet of the electrolyte buffer, and the outlet of the electrolyte buffer is connected to the inlet of the circulation component.

[0012] In the above technical solution, the hydrogen production system in the first working mode can provide a basis for the subsequent start-up of the electrolyzer by utilizing components such as the heat exchanger and the circulation component, thereby realizing the effective utilization of energy and the recycling of resources.

[0013] According to one embodiment of this application, the hydrogen production system further includes a heat exchanger, a first path of which is connected between the gas-liquid separator and the circulation assembly.

[0014] In the above technical solution, the first path of the heat exchanger is connected between the gas-liquid separator and the circulation component. The electrolyte separated from the gas-liquid separator can enter the circulation component through the heat exchanger. The second path of the heat exchanger can selectively introduce external coolant to cool the overheated electrolyte.

[0015] According to one embodiment of this application, the hydrogen production system includes a second operating mode, in which the outlet of the electrolyzer is connected to the inlet of the gas-liquid separator, the return port of the gas-liquid separator is connected to the first inlet of the heat exchanger, and the first outlet of the heat exchanger is connected to the inlet of the circulation component.

[0016] The outlet of the electrolytic cell is connected to the inlet of the electrolyte buffer, and the outlet of the electrolyte buffer is connected to the inlet of the circulation component.

[0017] In the above technical solution, the second working mode of the hydrogen production system can improve the stability and efficiency of the system by precisely controlling the connection and status between the components.

[0018] According to one embodiment of this application, the return port of the gas-liquid separator is connected to the inlet of the electrolyte buffer.

[0019] In the above technical solution, the electrolyte buffer can be used to store electrolyte and can also mix electrolytes at different temperatures after the electrolytic cell is turned on, so as to maintain the stability and efficiency of the electrolysis process.

[0020] According to one embodiment of this application, the hydrogen production system includes a third operating mode, in which the outlet of the electrolyzer is connected to the inlet of the electrolyte buffer, and the outlet of the electrolyte buffer is connected to the inlet of the circulation component.

[0021] The outlet of the electrolytic cell is connected to the inlet of the gas-liquid separator, and the return port of the gas-liquid separator is connected to the inlet of the electrolyte buffer.

[0022] The return port of the gas-liquid separator is connected to the first inlet of the heat exchanger, and the first outlet of the heat exchanger is connected to the inlet of the circulation component.

[0023] In the above technical solution, the third working mode of the hydrogen production system can achieve electrolyte separation, heat exchange and recycling by precisely controlling the connection and status between the components, thereby improving the efficiency and stability of the hydrogen production system.

[0024] According to one embodiment of this application, the hydrogen production system includes a fourth operating mode, in which the outlet of the electrolyzer is connected to the inlet of the gas-liquid separator, the return port of the gas-liquid separator is connected to the first inlet of the heat exchanger, and the first outlet of the heat exchanger is connected to the inlet of the circulation component.

[0025] In the above technical solution, the fourth working mode of the hydrogen production system can achieve gas-liquid separation, heat exchange and recycling by precisely controlling the connection and status between the components, providing the system with more flexibility and adaptability to cope with different operating conditions and process requirements.

[0026] According to one embodiment of this application, the electrolyte buffer is connected sequentially to the second path of the heat exchanger.

[0027] In the above technical solution, the outlet of the electrolyte buffer is connected to the second inlet of the heat exchanger, and the second outlet of the heat exchanger is connected to the inlet of the electrolyte buffer, forming an independent circulation loop. In the second loop, the electrolyte in the electrolyte buffer is used as the coolant in the heat exchanger, and the heat exchanger can be used to cool the electrolyte from the gas-liquid separator to meet the needs of subsequent system processing.

[0028] According to one embodiment of this application, the hydrogen production system includes a fifth operating mode, in which the outlet of the electrolyzer is connected to the inlet of the gas-liquid separator, the return port of the gas-liquid separator is connected to the first inlet of the heat exchanger, and the first outlet of the heat exchanger is connected to the inlet of the circulation component.

[0029] The outlet of the electrolytic cell is connected to the inlet of the electrolyte buffer, the outlet of the electrolyte buffer is connected to the second inlet of the heat exchanger, and the second outlet of the heat exchanger is connected to the inlet of the electrolyte buffer.

[0030] In the above technical solution, the fifth operating mode of the hydrogen production system preheats or cools the electrolyte through the heat exchanger, which can optimize the system's heat management and help reduce the risk of system abnormalities or failures.

[0031] According to one embodiment of this application, the hydrogen production system further includes: a cooler, a first path of which is connected in parallel with the heat exchanger, and a second path of which is connected sequentially to the electrolyte buffer.

[0032] In the above technical solution, the electrolyte flowing out of the gas-liquid separator has two parallel heat exchange paths, one through the first path of the heat exchanger and the other through the first path of the cooler. This configuration can be switched between the two paths or operated simultaneously as needed to achieve different heat management objectives.

[0033] According to one embodiment of this application, the hydrogen production system includes a sixth operating mode, in which the outlet of the electrolyzer is connected to the inlet of the gas-liquid separator, the first inlet of the cooler is connected to the return port of the gas-liquid separator, and the first outlet of the cooler is connected to the inlet of the circulation component.

[0034] The outlet of the electrolytic cell is connected to the inlet of the electrolyte buffer, the outlet of the electrolyte buffer is connected to the second inlet of the cooler, and the second outlet of the cooler is connected to the inlet of the electrolyte buffer.

[0035] In the above technical solution, the sixth working mode of the hydrogen production system preheats or cools the electrolyte through the cooler or the coordinated operation of the cooler and the heat exchanger, which can optimize the heat management of the system and help reduce the risk of system abnormalities or failures.

[0036] According to one embodiment of this application, the electrolyzer includes a hydrogen-side outlet and an oxygen-side outlet, and the gas-liquid separator includes a hydrogen-side gas-liquid separator and an oxygen-side gas-liquid separator;

[0037] The hydrogen-side outlet and the inlet of the hydrogen-side gas-liquid separator are connected by a first hydrogen-side control valve.

[0038] The oxygen-side outlet and the inlet of the oxygen-side gas-liquid separator are connected by a first oxygen-side control valve.

[0039] The hydrogen-side outlet and the electrolyte buffer inlet are connected via a second hydrogen-side control valve.

[0040] The oxygen-side outlet and the electrolyte buffer inlet are connected via a second oxygen-side control valve.

[0041] The return port of the gas-liquid separator is connected to the inlet of the electrolyte buffer via a first control valve;

[0042] The outlet of the electrolyte buffer is connected to the inlet of the circulation component via a second control valve.

[0043] The hydrogen production system further includes a heat exchanger, a first connection of which is between the gas-liquid separator and the circulation assembly;

[0044] The return port of the gas-liquid separator is connected to the first inlet of the heat exchanger via a third control valve.

[0045] The first outlet of the heat exchanger is connected to the inlet of the circulation component.

[0046] In the above technical solution, the connection relationship between the gas-liquid separator, the electrolyte buffer, the circulation component and the heat exchanger can be flexibly adjusted by controlling the on / off state of multiple control valves to adapt to different operating conditions and chemical reaction requirements. At the same time, by introducing the heat exchanger for heat management, it helps to operate more systematically and efficiently and reduce safety risks.

[0047] According to one embodiment of this application, the outlet of the electrolyte buffer is connected to the second inlet of the heat exchanger via the fourth control valve;

[0048] The second outlet of the heat exchanger is connected to the inlet of the electrolyte buffer.

[0049] In the above technical solution, the connection relationship between the gas-liquid separator, the electrolyte buffer, the circulation component and the heat exchanger can be flexibly adjusted by controlling the on / off state of multiple control valves to adapt to different operating conditions and chemical reaction requirements. At the same time, by introducing the heat exchanger for heat management, it helps to operate more systematically and efficiently and reduce safety risks.

[0050] According to one embodiment of this application, the hydrogen production system further includes: a cooler, a first path of which is connected in parallel with the heat exchanger, and a second path of which is connected sequentially to the electrolyte buffer.

[0051] The return port of the gas-liquid separator is connected to the first inlet of the cooler;

[0052] The first outlet of the cooler is connected to the inlet of the circulation component;

[0053] The outlet of the electrolyte buffer is connected to the second inlet of the cooler via the fifth control valve;

[0054] The second outlet of the cooler is connected to the inlet of the electrolyte buffer.

[0055] In the above technical solution, by configuring the cooler and the heat exchanger in parallel, a variety of heat management options can be provided. The return liquid of the gas-liquid separator can be selectively cooled or exchanged for heat through the cooler or the heat exchanger to meet different operating requirements and chemical reaction conditions.

[0056] According to one embodiment of this application, the power supply for the electrolytic cell includes new energy power generation equipment.

[0057] In the above technical solution, the power supply of the electrolytic cell may include new energy power generation equipment. This combination helps to promote energy transformation and green and low-carbon development, and can also realize the efficient utilization and storage of energy.

[0058] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0059] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0060] Figure 1 This is one of the structural schematic diagrams of the hydrogen production system provided in the embodiments of this application;

[0061] Figure 2 This is a second schematic diagram of the hydrogen production system provided in the embodiments of this application;

[0062] Figure 3 This is the third schematic diagram of the hydrogen production system provided in the embodiments of this application.

[0063] Figure label:

[0064] Electrolytic cell 10,

[0065] Gas-liquid separator 20, hydrogen-side gas-liquid separator 210, oxygen-side gas-liquid separator 220;

[0066] Electrolyte buffer 30;

[0067] Loop component 40;

[0068] Heat exchanger 50;

[0069] Cooler 60;

[0070] First hydrogen-side control valve K11, second hydrogen-side control valve K12, first oxygen-side control valve K13, second oxygen-side control valve K14, first control valve F1, second control valve F2, third control valve F3, fourth control valve F4, fifth control valve F5. Detailed Implementation

[0071] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0072] This application aims to at least address the technical problem of excessive wasted power during startup in parallel multi-electrolyzer systems in related technologies. To this end, this application proposes a hydrogen production system that can reduce wasted power during startup, thereby enhancing the system's adaptability to a wide power range under renewable energy input.

[0073] The following is for reference. Figures 1-3 A hydrogen production system according to an embodiment of this application is described.

[0074] like Figure 1 As shown, the hydrogen production system is used for hydrogen production by water electrolysis and includes: at least one electrolyzer 10, a circulation assembly 40, a gas-liquid separator 20, and an electrolyte buffer 30.

[0075] Electrolyzer 10 is the core part of the entire hydrogen production system. It typically includes a cathode, an anode, and an electrolyte. The electrolyte is usually an alkaline solution (such as sodium hydroxide, potassium hydroxide, etc.) or pure water. When current passes through electrolyzer 10, water molecules gain electrons at the cathode and are reduced to hydrogen, while they lose electrons at the anode and are oxidized to oxygen.

[0076] The circulation component 40 is used to circulate the electrolyte in the system to maintain the continuous electrolysis process. The electrolyte can be continuously transported to the electrolytic cell 10 for electrolysis through the circulation component 40, and then sent back for regeneration or treatment after electrolysis is completed.

[0077] The main function of the gas-liquid separator 20 is to separate the hydrogen and oxygen generated during the electrolysis process from the electrolyte. In the electrolytic cell 10, hydrogen and oxygen usually exist in the electrolyte in the form of bubbles. The gas-liquid separator 20 uses the buoyancy or other physical properties of these gases to separate them from the solution. The separated gases can be further purified or used for other purposes, while the electrolyte is returned to the electrolytic cell 10 through a circulation loop.

[0078] The electrolyte buffer 30 can be used to store electrolyte or adjust the concentration or temperature of the electrolyte. During electrolysis, the temperature of the electrolyte will change. At the same time, the electrolyzer 10 is set with rated operating conditions, which limits the temperature of the electrolyte entering the electrolyzer 10. Exceeding the limit of the electrolyte temperature may affect the electrolysis efficiency and product quality. The electrolyte buffer 30 can mix electrolytes of different temperatures to maintain the stability and efficiency of the electrolysis process. In addition, the electrolyte buffer 30 can also be used to store spare electrolyte to cope with possible failures or maintenance needs in the hydrogen production system.

[0079] like Figure 1As shown, the hydrogen production system includes multiple circulation components 40 and multiple electrolyzers 10. The circulation components 40 and electrolyzers 10 are connected in a one-to-one correspondence. The electrolyte circulation loop of the hydrogen production system includes a circulation loop from the electrolyzer 10 to the gas-liquid separator 20 and a circulation loop from the electrolyzer 10 to the electrolyte buffer 30. When the electrolyzer 10 is turned on, the electrolyzer 10 is connected to the gas-liquid separator 20. When the electrolyzer 10 is turned off, the electrolyzer 10 is connected to the electrolyte buffer 30.

[0080] When the electrolytic cell 10 is turned on, the inlet of the gas-liquid separator 20 is connected to the outlet of the electrolytic cell 10, and the return port of the gas-liquid separator 20 is connected to the inlet of the circulation component 40. The mixed liquid flowing out of the electrolytic cell 10 is separated into hydrogen, oxygen and electrolyte in the gas-liquid separator 20. The hydrogen and oxygen flow out through the hydrogen outlet and oxygen outlet connected to the outside, respectively. The electrolyte re-enters the electrolytic cell 10 through the circulation component 40 to complete the electrolyte circulation.

[0081] When the electrolyzer 10 is shut down, the inlet of the electrolyte buffer 30 is connected to the outlet of the electrolyzer 10, and the outlet of the electrolyte buffer 30 is connected to the inlet of the circulation component 40. The electrolyte flowing out of the electrolyzer 10 passes through the electrolyte buffer 30 and then re-enters the electrolyzer 10 through the circulation component 40 to complete the electrolyte circulation. At this time, the hydrogen production system has been started, but the power is insufficient to support the operation of multiple electrolyzers 10. The electrolyzers 10 that are not started are set with a minimum electrolyte circulation flow rate and there is medium flow inside to maintain the pressure balance at both ends of all electrolyzers 10 and reduce the safety risks such as cross-contamination or diaphragm perforation caused by hydrogen and oxygen passing through the diaphragm in the electrolyzer 10.

[0082] In the above description, the circulation component 40 feeds liquid into the electrolytic cell 10. The liquid exiting the electrolytic cell 10 flows selectively into the gas-liquid separator 20 or the electrolyte buffer 30 through the control element. The liquid processed by the gas-liquid separator 20 or the electrolyte buffer 30 flows back to the circulation component 40, forming a closed loop. The gas-liquid separation and electrolyte buffering functions are achieved by switching.

[0083] Currently, large-scale water electrolysis hydrogen production stations typically consist of multiple electrolyzers 10 connected in parallel, all sharing a single gas-liquid separation device. However, in green electricity hydrogen production scenarios using renewable energy power generation equipment, fluctuations in renewable energy power generation can prevent the simultaneous startup of the multi-electrolyzer system. In related technologies, multiple electrolyzers 10 are typically started in stages and batches as renewable energy power generation gradually increases or reaches a certain level. This results in inconsistent flow rates of the circulating electrolyte through the system at any given time, or situations where some electrolyzers 10 are running while others are not. In such cases, the selection of the circulating electrolyte flow rate significantly impacts the safety and production efficiency of the water electrolysis hydrogen production system. If the circulating electrolyte flow rate is based on the rated flow rate of multiple electrolyzers 10, the circulation components 40 used for electrolyte circulation will perform a significant amount of wasted effort. Simultaneously, a large electrolyte flow rate and a small gas flow rate in the gas-liquid separator 20 will lead to a deterioration in separation efficiency. If the circulating electrolyte is reduced to the circulating flow rate of the electrolyzer 10 during startup, the residual gas in the non-starting electrolyzer 10 will accumulate without being carried out by the airflow, or the residual gas will pass through the diaphragm and cause cross-contamination, resulting in safety risks such as hydrogen-oxygen mixture explosion.

[0084] Based on the above considerations, in order to solve the safety risks caused by unsuitable circulating electrolyte flow rate, this application proposes a hydrogen production system. In this hydrogen production system, an electrolyte buffer is provided. When the electrolyzer 10 is in different working states such as start-up or shutdown, the hydrogen production system has multiple working modes. The switching between gas-liquid separation function and electrolyte buffer function can be controlled by adjusting different valves.

[0085] According to the hydrogen production system provided in the embodiments of this application, by constructing an electrolyte circulation loop that connects the electrolyzer 10 to the gas-liquid separator 20 and the electrolyte buffer 30 respectively, the wasted energy during the start-up of the parallel multi-electrolyzer system can be reduced, which helps to improve the product quality of hydrogen production and also helps to enhance the system's adaptability to a wide power range under new energy power input.

[0086] In some embodiments, such as Figure 1 As shown, the electrolyzer 10 includes a hydrogen-side outlet and an oxygen-side outlet, and the gas-liquid separator 20 includes a hydrogen-side gas-liquid separator 210 and an oxygen-side gas-liquid separator 220. The electrolyzer 10, the gas-liquid separator 20 and the electrolyte buffer 30 are connected by valves. The hydrogen production system also includes a heat exchanger 50, and the first path of the heat exchanger 50 is connected between the gas-liquid separator 20 and the circulation assembly 40.

[0087] Electrolyzer 10 includes a hydrogen-side outlet and an oxygen-side outlet. Gas-liquid separator 20 is also divided into a hydrogen-side gas-liquid separator 210 and an oxygen-side gas-liquid separator 220, which respectively process gas and liquid mixtures from different sides. The hydrogen-side gas-liquid separator 210 is used to separate hydrogen and electrolyte from the hydrogen-side outlet of electrolyzer 10, and the oxygen-side gas-liquid separator 220 is used to separate oxygen and electrolyte from the oxygen-side outlet of electrolyzer 10.

[0088] For example, the inlet of the hydrogen-side gas-liquid separator 210 is connected to the hydrogen-side outlet of the electrolyzer 10 through a first hydrogen-side control valve K11. Hydrogen and electrolyte flow out from the hydrogen-side outlet of the electrolyzer 10 and enter the inlet of the hydrogen-side gas-liquid separator 210 through the first hydrogen-side control valve K11. The inlet of the oxygen-side gas-liquid separator 220 is connected to the oxygen-side outlet of the electrolyzer 10 through a first oxygen-side control valve K13. Oxygen and electrolyte flow out from the oxygen-side outlet of the electrolyzer 10 and enter the inlet of the oxygen-side gas-liquid separator 220 through the first oxygen-side control valve K13.

[0089] Meanwhile, the inlet of the electrolyte buffer 30 is connected to the hydrogen side outlet of the electrolyzer 10 through the second hydrogen side control valve K12. The electrolyte flows out from the hydrogen side outlet of the electrolyzer 10 and enters the electrolyte buffer 30 through the second hydrogen side control valve K12. The inlet of the electrolyte buffer 30 is connected to the oxygen side outlet of the electrolyzer 10 through the second oxygen side control valve K14. The electrolyte flows out from the hydrogen-oxygen side outlet of the electrolyzer 10 and enters the electrolyte buffer 30 through the second oxygen side control valve K14.

[0090] In addition, the hydrogen production system also includes a heat exchanger 50. The first path of the heat exchanger 50 is connected between the gas-liquid separator 20 and the circulation assembly 40. The return port of the gas-liquid separator 20 is connected to the inlet of the electrolyte buffer 30 through a first control valve F1. The outlet of the electrolyte buffer 30 is connected to the inlet of the circulation assembly 40 through a second control valve F2. At the same time, the return port of the gas-liquid separator 20 is connected to the first path of the heat exchanger 50 through a third control valve F3. The first path of the heat exchanger 50 is connected to the inlet of the circulation assembly 40.

[0091] The first control valve F1 and the third control valve F3 are mainly used to regulate the flow direction of the electrolyte flowing out of the return port of the gas-liquid separator 20. When the first control valve F1 is open and the third control valve F3 is closed, the electrolyte flowing out of the return port of the gas-liquid separator 20 flows to the electrolyte buffer 30. When the first control valve F1 is closed and the third control valve F3 is open, the electrolyte flowing out of the return port of the gas-liquid separator 20 flows to the first path of the heat exchanger 50. When both the first control valve F1 and the third control valve F3 are open, the electrolyte flowing out of the return port of the gas-liquid separator 20 flows to both the electrolyte buffer 30 and the first path of the heat exchanger 50.

[0092] The outlet of the electrolyte buffer 30 is connected to the inlet of the circulation assembly 40 through the second control valve F2. The outlet of the circulation assembly 40 is connected to the inlet of the electrolytic cell 10. The circulation assembly 40 is responsible for sending the circulating electrolyte into the electrolytic cell 10. When the second control valve F2 is open, the electrolyte flowing out of the electrolyte buffer 30 and the electrolyte flowing out of the first path of the heat exchanger 50 enter the inlet of the electrolytic cell 10 through the circulation assembly 40. When the second control valve F2 is closed, the electrolyte flowing out of the first path of the heat exchanger 50 enters the inlet of the electrolytic cell 10 through the circulation assembly 40.

[0093] It should be noted that the liquid flowing out of the outlet of the gas-liquid separator 20 and into the inlet of the electrolytic cell 10 is electrolyte, while the liquid flowing out of the outlet of the electrolytic cell 10 and into the inlet of the gas-liquid separator 20 is hydrogen, oxygen and electrolyte. In addition, the first path of the heat exchanger 50 is electrolyte from the gas-liquid separator 20, and the second path of the heat exchanger 50 is connected to the outside and is supplied with external coolant to cool the overheated electrolyte.

[0094] Understandably, by adjusting the on / off states of multiple control valves, the connection relationships between the gas-liquid separator 20, the electrolyte buffer 30, the circulation component 40, and the heat exchanger 50 can be flexibly adjusted to adapt to different operating conditions and chemical reaction requirements. At the same time, by introducing the heat exchanger 50 for heat management, it helps to operate the system more efficiently and reduce safety risks.

[0095] In some embodiments, the hydrogen production system has multiple operating modes, including but not limited to:

[0096] Example 1: The hydrogen production system includes a first operating mode.

[0097] In this embodiment, as shown in the figure, in the first working mode, the outlet of the electrolytic cell 10 is connected to the inlet of the electrolyte buffer 30, and the outlet of the electrolyte buffer 30 is connected to the inlet of the circulation component 40.

[0098] At this time, the electrolytic cell 10 is in a stopped state, the first control valve F1 and the third control valve F3 are closed, the second control valve F2 is open, the outlet of the electrolytic cell 10 is connected to the inlet of the electrolyte buffer 30 through the second hydrogen side control valve K12, and the outlet of the electrolyte buffer 30 is connected to the inlet of the circulation component 40 through the second control valve F2.

[0099] The electrolyte flowing out of the electrolyzer 10 passes through the electrolyte buffer 30 and then re-enters the electrolyzer 10 through the circulation component 40, completing the electrolyte circulation to maintain the balance and stable supply of electrolyte in the system. At this time, all the electrolyzers 10 in the hydrogen production system are not turned on. The electrolyzers 10 that are not turned on are set with a minimum electrolyte circulation flow rate and there is medium flow inside to maintain the pressure balance at both ends of all electrolyzers 10 and reduce the safety risks such as cross-contamination or diaphragm perforation caused by hydrogen and oxygen passing through the diaphragm in the electrolyzer 10.

[0100] Understandably, the hydrogen production system in the first operating mode can provide a foundation for the subsequent start-up of the electrolyzer 10 by utilizing components such as the heat exchanger 50 and the circulation component 40, thereby achieving efficient energy utilization and resource recycling.

[0101] Example 2: The hydrogen production system includes a second operating mode.

[0102] In this embodiment, as shown in the figure, the hydrogen production system also includes a heat exchanger 50. The first path of the heat exchanger 50 is connected between the gas-liquid separator 20 and the circulation component 40. In the second operating mode, the outlet of the electrolyzer 10 is connected to the inlet of the gas-liquid separator 20, the return port of the gas-liquid separator 20 is connected to the first path inlet of the heat exchanger 50, and the first path outlet of the heat exchanger 50 is connected to the inlet of the circulation component 40. At the same time, the outlet of the electrolyzer 10 is connected to the inlet of the electrolyte buffer 30, and the outlet of the electrolyte buffer 30 is connected to the inlet of the circulation component 40.

[0103] Heat exchanger 50 is a device used for heat exchange between different media. In a hydrogen production system, the main function of heat exchanger 50 is to regulate and stabilize the temperature of the fluid in the system so that each component can operate within a suitable temperature range, thereby improving the overall efficiency and stability of the system.

[0104] The first path of the heat exchanger 50 is connected between the gas-liquid separator 20 and the circulation assembly 40. The electrolyte separated from the gas-liquid separator 20 can enter the circulation assembly 40 through the heat exchanger 50. The second path of the heat exchanger 50 can selectively introduce external coolant to cool the overheated electrolyte.

[0105] In the second working mode, the first control valve F1 is closed, the second control valve F2 and the third control valve F3 are open, the return port of the gas-liquid separator 20 is connected to the first inlet of the heat exchanger 50, and at the same time, the outlet of the electrolytic cell 10 is connected to the inlet of the electrolyte buffer 30, and the outlet of the electrolyte buffer 30 is connected to the inlet of the circulation component 40.

[0106] At this time, due to the initial power limitation, some electrolytic cells 10 are in a shutdown state, while other electrolytic cells 10 are in an on state. The electrolytic cells 10 that have been turned on have not yet reached the rated working conditions. The electrolyte temperature flowing out of both the off-state and on-state electrolytic cells 10 is lower than the rated working temperature. All the electrolyte flowing out of the gas-liquid separator 20 enters the first path of the heat exchanger 50, while the second path of the heat exchanger 50 is not supplied with coolant.

[0107] As the power increases, the amount of electrolyte required to maintain circulation in each electrolytic cell 10 increases. By adjusting the opening of the second control valve F2, more electrolyte stored in the electrolyte buffer 30 can enter the circulation.

[0108] Understandably, the second operating mode of the hydrogen production system can improve the system's stability and efficiency by precisely controlling the connections and states between the components.

[0109] Example 3: The hydrogen production system includes a third operating mode.

[0110] In this embodiment, as shown in the figure, the return port of the gas-liquid separator 20 is connected to the inlet of the electrolyte buffer 30. In the third working mode, the outlet of the electrolytic cell 10 is connected to the inlet of the electrolyte buffer 30, and the outlet of the electrolyte buffer 30 is connected to the inlet of the circulation component 40; the outlet of the electrolytic cell 10 is connected to the inlet of the gas-liquid separator 20, and the return port of the gas-liquid separator 20 is connected to the inlet of the electrolyte buffer 30; the return port of the gas-liquid separator 20 is connected to the first inlet of the heat exchanger 50, and the first outlet of the heat exchanger 50 is connected to the inlet of the circulation component 40.

[0111] The main function of the gas-liquid separator 20 is to separate gas and liquid mixtures, ensuring the purity of the gas and the recovery of the liquid. Its return port is usually designed to return the separated liquid to an appropriate location in the system for further processing or reuse. The electrolyte buffer 30 can be used to store electrolyte and mix electrolytes at different temperatures to maintain the stability and efficiency of the electrolysis process.

[0112] In the third working mode, the first control valve F1, the second control valve F2, and the third control valve F3 are all open. The return port of the gas-liquid separator 20 is connected to the first inlet of the heat exchanger 50 and the inlet of the electrolyte buffer 30, respectively. The first outlet of the heat exchanger 50 is connected to the inlet of the circulation component 40, and the outlet of the electrolyte buffer 30 is connected to the inlet of the circulation component 40.

[0113] At this time, some electrolytic cells 10 are in a stopped state, while others are in a powered-on state. The powered-on electrolytic cells 10 have reached their rated operating conditions, and the electrolyte flowing out of the powered-on electrolytic cells 10 has a temperature not lower than the rated operating temperature. However, the electrolyte flowing out of the powered-on electrolytic cells 10 has a temperature lower than the rated operating temperature. The electrolyte flowing into the electrolyte buffer 30 from the gas-liquid separator 20 and the electrolyte flowing into the electrolyte buffer 30 from the electrolytic cells 10 are uniformly mixed in the electrolyte buffer 30. The electrolyte with a temperature not lower than the rated operating temperature is cooled down by direct thermal convection, while the electrolyte with a temperature lower than the rated operating temperature is preheated, which is beneficial for the rapid heating of the powered-on electrolytic cells 10.

[0114] Another portion of the electrolyte flowing out of the gas-liquid separator 20 enters the first path of the heat exchanger 50, while the second path of the heat exchanger 50 is circulated with coolant. The mixed electrolyte and the electrolyte flowing from the gas-liquid separator 20 into the first path of the heat exchanger 50 merge before entering the circulation assembly 40, and return to the electrolytic cell 10 at a moderate temperature.

[0115] Understandably, the third operating mode of the hydrogen production system can achieve electrolyte separation, heat exchange, and recycling by precisely controlling the connections and states between components, thereby improving the system's efficiency and stability.

[0116] Example 4: The hydrogen production system includes a fourth operating mode.

[0117] In this embodiment, as shown in the figure, in the fourth working mode, the first control valve F1 and the second control valve F2 are closed, the third control valve F3 is open, the outlet of the electrolytic cell 10 is connected to the inlet of the gas-liquid separator 20, the first inlet of the heat exchanger 50 is connected to the return port of the gas-liquid separator 20, and the first outlet of the heat exchanger 50 is connected to the inlet of the circulation component 40.

[0118] At this time, all electrolytic cells 10 are in the start-up state, and the electrolytic cells 10 that have been started up have reached the rated working conditions. The temperature of the electrolyte flowing out of the electrolytic cells 10 that have been started up is not lower than the rated working temperature. At the same time, the second channel of the heat exchanger 50 is supplied with coolant. The heat exchanger 50 cools down the electrolyte that is not lower than the rated working temperature, which is beneficial to the stable operation of the electrolytic cells 10 that have been started up.

[0119] Understandably, the fourth operating mode of the hydrogen production system can achieve gas-liquid separation, heat exchange, and recycling by precisely controlling the connection and status between various components, providing the system with greater flexibility and adaptability to cope with different operating conditions and process requirements.

[0120] Exemplarily, when any electrolyzer 10 is started up, there is a minimum value for the circulating electrolyte flow rate of each electrolyzer 10. When the input power Pi < Pset, Fi = Pset / Ps×Fs = Fmin; when Pi ≥ Pset, Fi = Pi / Ps×Fs.

[0121] Where i is the number of started-up electrolyzers 10, Pi is the input power of each electrolyzer 10, Fi is the circulating electrolyte flow rate of each electrolyzer 10, Pset is the set lower limit power. When the input power is lower than this lower limit power, the circulating electrolyte flow rate is the lower limit flow rate Fmin, Ps is the rated power of a single electrolyzer 10, Fs is the rated flow rate of the circulating electrolyte. In addition, Pset can be determined according to the lowest start-up power of the actual equipment and the lowest value in the operation flexibility range.

[0122] Taking the example of multiple electrolyzers 10 starting up in sequence, when the new energy power generation is low, the new energy power is not sufficient to start up multiple electrolyzers 10 simultaneously. At this time, only some electrolyzers 10 are started up. When the initial power of the started-up electrolyzers 10 is less than Pset, the circulating electrolyte flow rate of the set started-up electrolyzers 10 is set to Fmin. At this time, the unstarted electrolyzers 10 are also set to maintain the lowest electrolyte circulation flow rate to maintain the pressure balance at both ends of the remaining unstarted electrolyzers 10 and the internal medium flow, and reduce safety problems such as gas cross-flow or diaphragm perforation caused by hydrogen or oxygen passing through the diaphragm in the electrolyzer 10. When the power of the started-up electrolyzers 10 gradually increases, the electrolyte flow rate flowing out of the electrolyte buffer 30 increases, and the flow rate of the circulating electrolyte flowing to the started-up electrolyzers 10 increases to maintain a reasonable heating rate of the started-up electrolyzers 10.

[0123] In some embodiments, as Figure 1 shown, the outlet of the electrolyte buffer 30 is connected to the second inlet of the heat exchanger 50 through the fourth control valve F4, the second outlet of the heat exchanger 50 is connected to the inlet of the electrolyte buffer 30, the outlet of the electrolyte buffer 30 is connected to the inlet of the circulation component 40 through the second control valve F2, and the liquid return port of the gas-liquid separator 20 is connected to the first path of the heat exchanger 50 through the third control valve F3.

[0124] The inlet of the electrolyte buffer 30 is connected to the hydrogen side outlet of the electrolyzer 10 through the second hydrogen side control valve K12. The electrolyte flows out from the hydrogen side outlet of the electrolyzer 10 and enters the electrolyte buffer 30 through the second hydrogen side control valve K12. The inlet of the electrolyte buffer 30 is connected to the oxygen side outlet of the electrolyzer 10 through the second oxygen side control valve K14. The electrolyte flows out from the hydrogen-oxygen side outlet of the electrolyzer 10 and enters the electrolyte buffer 30 through the second oxygen side control valve K14.

[0125] At this time, the fourth control valve F4 is used to regulate the flow direction of the electrolyte flowing out of the outlet of the electrolyte buffer 30, and the third control valve F3 is mainly used to regulate the flow direction of the electrolyte flowing out of the return port of the gas-liquid separator 20.

[0126] In this embodiment, such as Figure 2 As shown, the electrolyte buffer 30 is connected to the second path of the heat exchanger 50 in sequence.

[0127] The outlet of the electrolyte buffer 30 is connected to the second inlet of the heat exchanger 50, and the second outlet of the heat exchanger 50 is connected to the inlet of the electrolyte buffer 30, forming an independent circulation loop. In the second loop, the electrolyte in the electrolyte buffer 30 is used as the coolant in the heat exchanger 50, which can be used to cool the electrolyte from the gas-liquid separator 20 to meet the needs of subsequent system processing.

[0128] For example, the hydrogen production system includes a fifth operating mode.

[0129] In the fifth operating mode, the first control valve F1 and the third control valve F3 are open, the second control valve F2 is closed, the outlet of the electrolytic cell 10 is connected to the inlet of the gas-liquid separator 20, the return port of the gas-liquid separator 20 is connected to the first inlet of the heat exchanger 50, the first outlet of the heat exchanger 50 is connected to the inlet of the circulation component 40, and at the same time, the outlet of the electrolytic cell 10 is connected to the inlet of the electrolyte buffer 30, the outlet of the electrolyte buffer 30 is connected to the second inlet of the heat exchanger 50, and the second outlet of the heat exchanger 50 is connected to the inlet of the electrolyte buffer 30.

[0130] At this time, some electrolytic cells 10 are in a stopped state, while other electrolytic cells 10 are in a powered-on state. The powered-on electrolytic cells 10 have reached their rated operating conditions. The electrolyte flowing out of the powered-on electrolytic cells 10 enters the first path of the heat exchanger 50, and the electrolyte flowing out of the electrolyte buffer 30 enters the second path of the heat exchanger 50 to act as a coolant. The two exchange heat in the heat exchanger 50 to cool the electrolyte flowing out of the powered-on electrolytic cells 10 and preheat the electrolyte flowing out of the electrolyte buffer 30.

[0131] Understandably, the fifth operating mode of the hydrogen production system preheats or cools the electrolyte through heat exchanger 50, which can optimize the system's heat management and help reduce the risk of system anomalies or malfunctions.

[0132] In some embodiments, such as Figure 3 As shown, the hydrogen production system also includes a cooler 60. The first path of the cooler 60 is connected in parallel with the heat exchanger 50, and the second path of the cooler 60 is connected sequentially to the electrolyte buffer 30.

[0133] In this embodiment, the return port of the gas-liquid separator 20 is connected to the first path of the cooler 60, the outlet of the electrolyte buffer 30 is connected to the second path of the cooler 60 through the fifth control valve F5, the outlet of the electrolyte buffer 30 is connected to the inlet of the circulation component 40 through the second control valve F2, and the return port of the gas-liquid separator 20 is connected to the first path of the heat exchanger 50 through the third control valve F3.

[0134] The electrolyte flowing out of the gas-liquid separator 20 has two parallel heat exchange paths, one through the first path of the heat exchanger 50 and the other through the first path of the cooler 60. This configuration allows for switching between the two paths or simultaneous operation as needed to achieve different heat management objectives.

[0135] At this time, the second path of heat exchanger 50 is connected to the external coolant, and the second path of cooler 60 is connected to electrolyte buffer 30 in sequence to form an independent circulation loop. The outlet of electrolyte buffer 30 is connected to the inlet of the second path of cooler 60 through the fifth control valve F5, and the outlet of the second path of cooler 60 is connected to the inlet of electrolyte buffer 30. In the second path, the electrolyte in electrolyte buffer 30 is used as the coolant in cooler 60. Cooler 60 can also be used to cool the electrolyte from gas-liquid separator 20 and preheat the electrolyte from electrolyte buffer 30.

[0136] For example, the hydrogen production system includes a sixth operating mode.

[0137] In the sixth operating mode, the fifth control valve F5 and the second control valve F2 are open, the third control valve F3 is closed, the first inlet of the cooler 60 is connected to the return port of the gas-liquid separator 20, the first outlet of the cooler 60 is connected to the inlet of the circulation component 40, the outlet of the electrolyte buffer 30 is connected to the second inlet of the cooler 60, and the second outlet of the cooler 60 is connected to the inlet of the electrolyte buffer 30.

[0138] At this time, some electrolytic cells 10 are in a stopped state, while other electrolytic cells 10 are in a powered-on state. The powered-on electrolytic cells 10 have reached their rated operating conditions. The electrolyte flowing out of the powered-on electrolytic cells 10 enters the first path of the cooler 60, while the electrolyte flowing out of the powered-off electrolytic cells 10 enters the second path of the cooler 60, serving as coolant. The two exchange heat in the cooler 60 to cool the electrolyte flowing out of the powered-on electrolytic cells 10 and preheat the electrolyte flowing out of the powered-off electrolytic cells 10.

[0139] Understandably, the parallel configuration of cooler 60 and heat exchanger 50 can provide a variety of heat management options. The return liquid from gas-liquid separator 20 can be selectively cooled or heat exchanged through cooler 60 or heat exchanger 50 to meet different operating requirements and chemical reaction conditions.

[0140] In some embodiments, the power supply for the electrolytic cell 10 includes new energy power generation equipment.

[0141] During electrolysis, when an electric current passes through the electrolyte, it causes a predetermined chemical reaction on the electrodes. The power supply is used to provide power for this process, and the power supply can include new energy power generation equipment, such as solar photovoltaic panels or wind turbines.

[0142] New energy power generation equipment has advantages such as environmental protection and sustainability. Compared with traditional fossil fuel power generation, it does not produce a large amount of greenhouse gases and other harmful substances, which helps to reduce environmental pollution and the impact of climate change. At the same time, the combination of new energy power generation equipment and electrolytic cell 10 can realize the efficient utilization and storage of energy.

[0143] It is understandable that the power supply for the electrolytic cell 10 may include new energy power generation equipment. This combination helps to promote energy transformation and green and low-carbon development, and can also achieve efficient energy utilization and storage.

[0144] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0145] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0146] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0147] In the description of this application, "multiple" means two or more.

[0148] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0149] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0150] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0151] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A hydrogen production system for use in water electrolysis to produce hydrogen, characterized in that, include: At least one electrolytic cell; The circulation component has its outlet connected to the inlet of the electrolytic cell; The gas-liquid separator has its inlet connected to the outlet of the electrolytic cell; An electrolyte buffer is provided, with its inlet connected to the outlet of the electrolytic cell; wherein, The inlet of one of the gas-liquid separator and the electrolyte buffer is connected to the outlet of the electrolytic cell, and the return port of the gas-liquid separator and the outlet of the electrolyte buffer are both connected to the inlet of the circulation component.

2. The hydrogen production system according to claim 1, characterized in that, The hydrogen production system includes a first operating mode, in which the outlet of the electrolyzer is connected to the inlet of the electrolyte buffer, and the outlet of the electrolyte buffer is connected to the inlet of the circulation component.

3. The hydrogen production system according to claim 1, characterized in that, Also includes: A heat exchanger, the first path of which is connected between the gas-liquid separator and the circulation assembly.

4. The hydrogen production system according to claim 3, characterized in that, The hydrogen production system includes a second operating mode. In the second operating mode, the outlet of the electrolyzer is connected to the inlet of the gas-liquid separator, the return port of the gas-liquid separator is connected to the first inlet of the heat exchanger, and the first outlet of the heat exchanger is connected to the inlet of the circulation component. The outlet of the electrolytic cell is connected to the inlet of the electrolyte buffer, and the outlet of the electrolyte buffer is connected to the inlet of the circulation component.

5. The hydrogen production system according to claim 3, characterized in that, The return port of the gas-liquid separator is connected to the inlet of the electrolyte buffer.

6. The hydrogen production system according to claim 5, characterized in that, The hydrogen production system includes a third operating mode, in which the outlet of the electrolyzer is connected to the inlet of the electrolyte buffer, and the outlet of the electrolyte buffer is connected to the inlet of the circulation component. The outlet of the electrolytic cell is connected to the inlet of the gas-liquid separator, and the return port of the gas-liquid separator is connected to the inlet of the electrolyte buffer. The return port of the gas-liquid separator is connected to the first inlet of the heat exchanger, and the first outlet of the heat exchanger is connected to the inlet of the circulation component.

7. The hydrogen production system according to claim 3, characterized in that, The hydrogen production system includes a fourth operating mode, in which the outlet of the electrolyzer is connected to the inlet of the gas-liquid separator, the return port of the gas-liquid separator is connected to the first inlet of the heat exchanger, and the first outlet of the heat exchanger is connected to the inlet of the circulation component.

8. The hydrogen production system according to claim 3, characterized in that, The inlet of the electrolyte buffer is connected sequentially to the second path of the heat exchanger.

9. The hydrogen production system according to claim 8, characterized in that, The hydrogen production system includes a fifth operating mode, in which the outlet of the electrolyzer is connected to the inlet of the gas-liquid separator, the return port of the gas-liquid separator is connected to the first inlet of the heat exchanger, and the first outlet of the heat exchanger is connected to the inlet of the circulation component. The outlet of the electrolytic cell is connected to the inlet of the electrolyte buffer, the outlet of the electrolyte buffer is connected to the second inlet of the heat exchanger, and the second outlet of the heat exchanger is connected to the inlet of the electrolyte buffer.

10. The hydrogen production system according to claim 3, characterized in that, Also includes: The cooler has a first path connected in parallel with the heat exchanger, and a second path connected sequentially with the electrolyte buffer.

11. The hydrogen production system according to claim 10, characterized in that, The hydrogen production system includes a sixth operating mode, in which the outlet of the electrolyzer is connected to the inlet of the gas-liquid separator, the return port of the gas-liquid separator is connected to the first inlet of the cooler, and the first outlet of the cooler is connected to the inlet of the circulation component. The outlet of the electrolytic cell is connected to the inlet of the electrolyte buffer, the outlet of the electrolyte buffer is connected to the second inlet of the cooler, and the second outlet of the cooler is connected to the inlet of the electrolyte buffer.

12. The hydrogen production system according to claim 1, characterized in that, The electrolyzer includes a hydrogen-side outlet and an oxygen-side outlet, and the gas-liquid separator includes a hydrogen-side gas-liquid separator and an oxygen-side gas-liquid separator. The hydrogen-side outlet and the inlet of the hydrogen-side gas-liquid separator are connected by a first hydrogen-side control valve. The oxygen-side outlet and the inlet of the oxygen-side gas-liquid separator are connected by a first oxygen-side control valve. The hydrogen-side outlet and the electrolyte buffer inlet are connected via a second hydrogen-side control valve. The oxygen-side outlet and the electrolyte buffer inlet are connected via a second oxygen-side control valve. The return port of the gas-liquid separator is connected to the inlet of the electrolyte buffer via a first control valve; The outlet of the electrolyte buffer is connected to the inlet of the circulation component via a second control valve. The hydrogen production system further includes a heat exchanger, a first connection of which is between the gas-liquid separator and the circulation assembly; The return port of the gas-liquid separator is connected to the first inlet of the heat exchanger via a third control valve. The first outlet of the heat exchanger is connected to the inlet of the circulation component.

13. The hydrogen production system according to claim 12, characterized in that, The outlet of the electrolyte buffer is connected to the second inlet of the heat exchanger via the fourth control valve; The second outlet of the heat exchanger is connected to the inlet of the electrolyte buffer.

14. The hydrogen production system according to claim 12, characterized in that, Also includes: The cooler has a first path connected in parallel with the heat exchanger and a second path connected sequentially with the electrolyte buffer. The return port of the gas-liquid separator is connected to the first inlet of the cooler; The first outlet of the cooler is connected to the inlet of the circulation component; The outlet of the electrolyte buffer is connected to the second inlet of the cooler via the fifth control valve; The second outlet of the cooler is connected to the inlet of the electrolyte buffer.

15. The hydrogen production system according to any one of claims 1-14, characterized in that, The power supply for the electrolytic cell includes new energy power generation equipment.

Images