Electrolytic hydrogen generation system

Abstract

The application provides an electrolytic hydrogen production system, comprising: an alkaline electrolysis assembly, a proton exchange membrane electrolysis assembly, a first hydrogen separator, a first oxygen separator, a second hydrogen separator, a second oxygen separator, a third hydrogen separator, and a third oxygen separator; the processing capacity of the third hydrogen separator is lower than that of the first hydrogen separator, and the processing capacity of the third oxygen separator is lower than that of the first oxygen separator. In the application, the alkaline electrolysis assembly is connected with the third hydrogen separator with a processing capacity lower than that of the first hydrogen separator and the third oxygen separator with a processing capacity lower than that of the first oxygen separator, so that the starting rate of the alkaline electrolysis assembly side under a low load state can be effectively improved, the gas production separation efficiency and purity can be improved, the circulation alkali flow can be reduced, and the gas-liquid separation effect of the electrolytic hydrogen production system can be ensured.

Description

Technical Field

[0001] This application relates to the field of electrolysis system technology, and more particularly to an electrolysis hydrogen production system. Background Technology

[0002] Increasingly, hydrogen production projects using water electrolysis are sourcing power from renewable energy sources. This necessitates that the water electrolysis hydrogen production equipment be large-scale, stable in operation, technologically mature, cost-effective, and capable of rapidly adjusting to and adapting to power fluctuations. This provides a foundation for the operation of combined alkaline electrolyzers and proton exchange membrane electrolyzers in hydrogen production systems. Consequently, the combination of alkaline electrolyzers and proton exchange membrane electrolyzers is becoming a new trend in large-scale green hydrogen projects.

[0003] However, in actual use, the new energy power supply equipment cannot provide stable power when the electrolysis hydrogen production system is started. At this time, the electrolysis hydrogen production system is in a low load state and cannot provide sufficient power to the alkaline electrolyzer side. This results in the alkaline electrolyzer in the system having a slow response such as temperature rise during startup, which in turn leads to a low gas production in the electrolysis hydrogen production system and cannot guarantee the gas-liquid separation effect of the electrolysis hydrogen production system.

[0004] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Utility Model Content

[0005] The main objective of this application is to provide an electrolytic hydrogen production system that addresses the technical problem in the prior art where the electrolytic hydrogen production system operates under low load conditions and the alkaline electrolyzer's slow temperature rise during startup fails to guarantee the gas-liquid separation effect.

[0006] To achieve the above objectives, this application provides an electrolytic hydrogen production system, comprising: an alkaline electrolysis component, a proton exchange membrane electrolysis component, a first hydrogen separator, a first oxygen separator, a second hydrogen separator, a second oxygen separator, a third hydrogen separator, and a third oxygen separator; wherein the processing capacity of the third hydrogen separator is lower than that of the first hydrogen separator, and the processing capacity of the third oxygen separator is lower than that of the first oxygen separator; The power supply terminals of the alkaline electrolysis component and the proton exchange membrane electrolysis component are both connected to the power output terminal of the new energy power supply equipment. The hydrogen output terminal of the alkaline electrolysis unit is connected to the first hydrogen separator via a first valve and to the third hydrogen separator via a second valve; the oxygen output terminal of the alkaline electrolysis unit is connected to the first oxygen separator via a third valve and to the third oxygen separator via a fourth valve. The hydrogen output terminal of the proton exchange membrane electrolysis unit is connected to the second hydrogen separator, and the oxygen output terminal of the proton exchange membrane electrolysis unit is connected to the second oxygen separator.

[0007] Optionally, the electrolytic hydrogen production system further includes: a fifth valve, a sixth valve, an alkali cooler, and an alkali circulation pump; The first end of the fifth valve is connected to the liquid output end of the first hydrogen separator and the liquid output end of the first oxygen separator. The first end of the sixth valve is connected to the liquid output end of the third hydrogen separator and the liquid output end of the third oxygen separator. The second end of the fifth valve is connected to the second end of the sixth valve and the input end of the alkali cooler. The output end of the alkali cooler is connected to the input end of the alkali circulation pump. The output end of the alkali circulation pump is connected to the alkali return end of the alkaline electrolysis component.

[0008] Optionally, the electrolytic hydrogen production system further includes: a heat exchanger, a seventh valve, an eighth valve, and a pure water circulation pump; The first end of the seventh valve is connected to the liquid output end of the second hydrogen separator and the liquid output end of the second oxygen separator, and the first end of the eighth valve is connected to the second end of the sixth valve, the second end of the fifth valve, and the input end of the alkali cooler; The second end of the seventh valve is connected to the first end of the heat exchanger, the second end of the heat exchanger is connected to the input end of the pure water circulation pump, and the output end of the pure water circulation pump is connected to the pure water return end of the proton exchange membrane electrolysis assembly. The second end of the eighth valve is connected to the third end of the heat exchanger, and the fourth end of the heat exchanger is connected to the input end of the alkali circulation pump.

[0009] Optionally, the electrolysis hydrogen production system further includes: a pure water cooler; The input end of the pure water cooler is connected to the liquid output end of the second hydrogen separator, the liquid output end of the second oxygen separator, and the first end of the seventh valve; the output end of the pure water cooler is connected to the input end of the pure water circulation pump.

[0010] Optionally, the electrolytic hydrogen production system further includes: a ninth valve and a tenth valve; The first end of the ninth valve is connected to the second end of the second valve and the hydrogen output end of the first hydrogen separator, and the second end of the ninth valve is connected to the third hydrogen separator. The first end of the tenth valve is connected to the second end of the fourth valve and the oxygen output end of the first oxygen separator, and the second end of the tenth valve is connected to the third oxygen separator.

[0011] Optionally, the electrolytic hydrogen production system further includes: an eleventh valve and a twelfth valve; The first end of the eleventh valve is connected to the hydrogen output end of the proton exchange membrane electrolysis assembly, and the second end of the eleventh valve is connected to the third hydrogen separator. The first end of the twelfth valve is connected to the oxygen output end of the proton exchange membrane electrolysis assembly, and the second end of the twelfth valve is connected to the third oxygen separator.

[0012] Optionally, the electrolytic hydrogen production system further includes: a thirteenth valve, a fourteenth valve, and a fifteenth valve; The first end of the thirteenth valve is connected to the liquid output end of the third hydrogen separator and the liquid output end of the third oxygen separator, and the second end of the thirteenth valve is connected to the input end of the pure water circulation pump in the proton exchange membrane electrolysis assembly. The first end of the fourteenth valve is connected to the first end of the eleventh valve and the hydrogen output end of the proton exchange membrane electrolysis assembly, and the second end of the fourteenth valve is connected to the input end of the second hydrogen separator. The first end of the fifteenth valve is connected to the first end of the twelfth valve and the oxygen output end of the proton exchange membrane electrolysis assembly, and the second end of the fifteenth valve is connected to the input end of the second oxygen separator.

[0013] Optionally, the electrolytic hydrogen production system further includes: a first and a second temperature transmitter; The first temperature transmitter is installed at the hydrogen output end of the first hydrogen separator or the oxygen output end of the first oxygen separator. The second temperature transmitter is located at the hydrogen output end of the second hydrogen separator or the oxygen output end of the second oxygen separator.

[0014] Optionally, the electrolysis hydrogen production system further includes: a controller; The controller is connected to each valve, circulating pump, and heat exchanger in the electrolysis hydrogen production system, and is used to control the opening degree of each valve, each circulating pump, and the heat exchanger during the start-up process of the alkaline electrolysis component and the proton exchange membrane electrolysis component.

[0015] Optionally, the controller is connected to the pure water circulation pump in the electrolytic hydrogen production system, and is also used to control the seventh valve and the eighth valve to shut off when the alkaline solution circulation temperature is higher than the pure water circulation temperature, and to control the flow rate of the pure water circulation process through the pure water circulation pump.

[0016] This application provides an electrolytic hydrogen production system, comprising: an alkaline electrolysis component, a proton exchange membrane electrolysis component, a first hydrogen separator, a first oxygen separator, a second hydrogen separator, a second oxygen separator, a third hydrogen separator, and a third oxygen separator; the processing capacity of the third hydrogen separator is lower than that of the first hydrogen separator, and the processing capacity of the third oxygen separator is lower than that of the first oxygen separator; the power supply terminals of the alkaline electrolysis component and the proton exchange membrane electrolysis component are both connected to the power output terminal of a new energy power supply device; the hydrogen output terminal of the alkaline electrolysis component is connected to the first hydrogen separator via a first valve and to the third hydrogen separator via a second valve; the oxygen output terminal of the alkaline electrolysis component is connected to the first oxygen separator via a third valve and to the third oxygen separator via a fourth valve; the hydrogen output terminal of the proton exchange membrane electrolysis component is connected to the second hydrogen separator, and the oxygen output terminal of the proton exchange membrane electrolysis component is connected to the second oxygen separator. In this application, when the alkaline electrolysis component is under low load, the second valve and the fourth valve are in a conducting state. By connecting the alkaline electrolysis component with a third hydrogen separator whose processing capacity is lower than that of the first hydrogen separator and a third oxygen separator whose processing capacity is lower than that of the first oxygen separator, the heating rate on one side of the alkaline electrolysis component under low load can be effectively increased, the gas separation efficiency and purity can be improved, the circulating alkali flow rate can be reduced, and the gas-liquid separation effect of the electrolysis hydrogen production system can be guaranteed. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the first embodiment of the electrolytic hydrogen production system proposed in this application; Figure 2 This is a schematic diagram of the structure of the second embodiment of the electrolytic hydrogen production system proposed in this application; Figure 3 This is a first structural schematic diagram of the third embodiment of the electrolytic hydrogen production system proposed in this application; Figure 4 This is a second structural schematic diagram of the third embodiment of the electrolytic hydrogen production system proposed in this application; Figure 5 This is a schematic diagram of the third structure of the third embodiment of the electrolytic hydrogen production system proposed in this application; Figure 6This is a schematic diagram of the fourth embodiment of the electrolytic hydrogen production system proposed in this application.

[0019] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application.

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0023] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0024] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of the electrolytic hydrogen production system proposed in the first embodiment of the electrolytic hydrogen production system of this application. Based on Figure 1 The first embodiment of the electrolytic hydrogen production system of this application is presented.

[0025] In this embodiment, the electrolytic hydrogen production system includes: an alkaline electrolysis component 20, a proton exchange membrane electrolysis component 10, a first hydrogen separator G1, a first oxygen separator G2, a second hydrogen separator G3, a second oxygen separator G4, a third hydrogen separator G5, and a third oxygen separator G6; the processing capacity of the third hydrogen separator G5 is lower than that of the first hydrogen separator G1, and the processing capacity of the third oxygen separator G6 is lower than that of the first oxygen separator G2. The power supply terminals of the alkaline electrolysis unit 20 and the proton exchange membrane electrolysis unit 10 are both connected to the power output terminal of the new energy power supply equipment. The hydrogen output end of the alkaline electrolysis unit 20 is connected to the first hydrogen separator G1 through the first valve F1 and to the third hydrogen separator G5 through the second valve F2; the oxygen output end of the alkaline electrolysis unit 20 is connected to the first oxygen separator G2 through the third valve F3 and to the third oxygen separator G6 through the fourth valve F4. The hydrogen output end of the proton exchange membrane electrolysis unit 10 is connected to the second hydrogen separator G3, and the oxygen output end of the proton exchange membrane electrolysis unit 10 is connected to the second oxygen separator G4. When the alkaline electrolysis unit 10 is under low load, the second valve F2 and the fourth valve F4 are in the conducting state.

[0026] It should be noted that electrolytic hydrogen production systems include alkaline electrolysis and proton exchange membrane (PEM) electrolysis. PEM electrolysis typically produces a limited amount of hydrogen, while alkaline electrolysis, although producing a larger volume, requires larger equipment and a longer start-up time for heating the alkaline solution. A hybrid approach can simultaneously utilize both alkaline and PEM methods. However, this approach faces several disadvantages and technical challenges in practical application. For example, there are system compatibility issues: alkaline and PEM electrolyzers use different electrolytes, operate under different conditions, and have different response times, making system coupling difficult and increasing the factors affecting system stability; joint operation control becomes more complex. Another example is system energy issues: the fluctuating characteristics of renewable energy and the inherent features of large-scale power plants mean that the system is prone to operating with large equipment and low loads. The low load state refers to the state where the power received by the alkaline electrolysis component 20 is too low. For example, when the power received by the alkaline electrolysis component 20 from the new energy power supply equipment is only 10% of the full power of the alkaline electrolysis component 20, the alkaline electrolysis component 20 cannot start normally.

[0027] In the actual use of a hybrid electrolysis hydrogen production system that combines alkaline electrolysis and proton exchange membrane electrolysis, during the start-up phase of the entire electrolysis hydrogen production system, insufficient power from the new energy power supply equipment causes the alkaline solution to heat up too slowly during the start-up process of the alkaline electrolysis cell on the alkaline side. This results in a low gas production rate in the electrolysis hydrogen production system, which cannot guarantee the gas-liquid separation effect of the electrolysis hydrogen production system.

[0028] It should be understood that the alkaline electrolysis unit 20 is used to perform alkaline electrolysis for hydrogen production. Multiple alkaline electrolysis cells (ALKs) can be installed within the alkaline electrolysis unit 20. These ALKs can be connected in series or in parallel. Alternatively, some ALKs can be connected in series, while others are connected in parallel. The proton exchange membrane electrolysis unit 10 is used to produce hydrogen through proton exchange membrane electrolysis. Multiple proton exchange membrane electrolysis cells (PEMs) can also be installed within the proton exchange membrane electrolysis unit 10. These PEMs can be connected in series, in parallel, or a combination of series and parallel connections. The new energy power supply equipment is equipment that generates electricity using sunlight, wind power, hydropower, etc. The electricity generated by this new energy power supply equipment is related to external factors such as sunlight, wind power, and hydropower. During load startup, the new energy power supply equipment typically cannot provide sufficient power to the load; that is, the load needs to be in a low-load state for a period of time during startup.

[0029] It should be noted that the separator is a device used to separate the gas generated during electrolysis from the liquid carried out from the electrolytic cell. By setting up this separator, the gas and liquid after electrolysis can be effectively separated, thereby increasing the amount of gas generated during the electrolysis process. The first hydrogen separator G1 is used to separate hydrogen and alkali solution during alkaline electrolysis. The hydrogen or oxygen output after separation can be fed into the purification unit for further purification. The first oxygen separator G2 is used to separate oxygen and alkali solution during alkaline electrolysis. The second hydrogen separator G3 is used to separate hydrogen and pure water during proton exchange membrane electrolysis. The second oxygen separator G4 is used to separate oxygen and pure water during proton exchange membrane electrolysis. Because alkaline electrolyzers are generally larger than PEM electrolyzers, the amount of gas generated during alkaline electrolysis is greater than that generated during proton exchange membrane electrolysis. Therefore, the processing capacity of the first hydrogen separator G1 is usually greater than that of the second hydrogen separator G3, and the processing capacity of the first oxygen separator G2 is greater than that of the second oxygen separator G4. The third hydrogen separator G5 and the third oxygen separator G6 are backup separators during electrolysis. Considering that the third hydrogen separator G5 and the third oxygen separator G6 can be used to replace the first hydrogen separator G1 and the first oxygen separator G2, or to replace the second hydrogen separator G3 and the second oxygen separator G4, the processing capacity refers to the amount of gas that the separator can process per unit time. Considering that the processing capacity of separators of different volumes is not the same, the larger the volume of the separator, the greater the gas-liquid separation processing capacity, and the smaller the volume, the smaller the gas-liquid separation processing capacity. Therefore, in this embodiment, the volume of the separator can also be limited. The third hydrogen separator G5 is selected with a volume smaller than that of the first hydrogen separator G1, and the third oxygen separator G6 is selected with a volume smaller than that of the first oxygen separator G2.

[0030] In practical use, the processing capacity of the third hydrogen separator G5 can be set lower than that of the first hydrogen separator G1, and the processing capacity of the third oxygen separator G6 can be set lower than that of the first oxygen separator G2. During the startup process on the alkaline electrolysis unit 20 side, the third hydrogen separator G5 and the third oxygen separator G6 can be used instead of the first hydrogen separator G1 and the first oxygen separator G2. During the startup process of the electrolytic hydrogen production system, the system is in a low-load state due to insufficient power provided by the new energy power supply equipment. Since the processing capacity of the third hydrogen separator G5 and the third oxygen separator G6 is relatively low, no excessive power is required for startup, thus avoiding slow startup of the devices on the alkaline electrolysis unit 20 side of the electrolytic hydrogen production system. Considering that the new energy power supply equipment can provide a faster response speed for the proton exchange membrane electrolysis module 10 during the start-up process of the electrolysis hydrogen production system, the proton exchange membrane electrolysis module 10 can generally be started first when the power provided by the overall new energy power supply equipment is insufficient to stably start both the proton exchange membrane electrolysis module 10 and the alkaline electrolysis module 10 at the same time. At this time, a relatively sufficient power can be provided to one side of the proton exchange membrane electrolysis module 10. Therefore, the third hydrogen separator G5 and the third oxygen separator G6 can adopt separators with the same processing capacity as the second hydrogen separator G3 and the second oxygen separator G4.

[0031] Furthermore, the first valve F1 is located between the hydrogen output terminal of the alkaline electrolysis assembly 10 and the first hydrogen separator G1. This first valve F1 controls the flow and specific flow rate of the gas-liquid mixture between the hydrogen output terminal of the alkaline electrolysis assembly 10 and the first hydrogen separator G1. The second valve F2 is located between the hydrogen output terminal of the alkaline electrolysis assembly 10 and the third hydrogen separator G5. This second valve F2 controls the flow and specific flow rate of the gas-liquid mixture between the hydrogen output terminal of the alkaline electrolysis assembly 10 and the third hydrogen separator G5. Similarly, the third valve F3 is located between the oxygen output terminal of the alkaline electrolysis assembly 10 and the first oxygen separator G2. This third valve F3 controls the flow and specific flow rate of the gas-liquid mixture between the oxygen output terminal of the alkaline electrolysis assembly 10 and the first oxygen separator G2. The fourth valve F4 is located between the oxygen output terminal of the alkaline electrolysis assembly 10 and the third oxygen separator G6. This fourth valve F4 controls the flow and specific flow rate of the gas-liquid mixture between the oxygen output terminal of the alkaline electrolysis assembly 10 and the third oxygen separator G6. These first to fourth valves can be mechanically controlled, electronically controlled, or magnetically controlled. When the first valve F1 and the third valve F3 are open, the gas-liquid mixture output from the alkaline electrolysis assembly 20 can be output to the first hydrogen separator G1 and the first oxygen separator G2 for gas-liquid separation. With the second valve F2 and the fourth valve F4 in operation, the gas-liquid mixture output from the alkaline electrolysis unit 20 can be output to the third hydrogen separator G5 and the third oxygen separator G6 for gas-liquid separation.

[0032] During the actual startup of the hydrogen electrolysis system, considering the relatively low power requirement of the proton exchange membrane electrolyzer 10, it is advisable to start the proton exchange membrane electrolyzer 10 first, and then start the alkaline electrolyzer 20 after the proton exchange membrane electrolyzer 10 has finished starting. If the total energy provided by the new energy power supply equipment is sufficient to start the alkaline electrolyzer 20, starting the alkaline electrolyzer 20 can be achieved by reducing the power on the proton exchange membrane electrolyzer 10 side, allowing the proton exchange membrane electrolyzer 10 to accommodate subsequent power fluctuations from the new energy power supply equipment, while minimizing power fluctuations on the alkaline electrolyzer 20 side.

[0033] In the specific operation process, the new energy power supply equipment can first input power into the electrolyzer inside the proton exchange membrane electrolyzer assembly 10, controlling one side of the proton exchange membrane electrolyzer assembly 10 to start up normally for hydrogen production. Once the proton exchange membrane electrolyzer assembly 10 is operating normally and stably for hydrogen production, i.e., the startup is complete, the second valve F2 and the fourth valve F4 can be controlled to be in the conducting state, while the first valve F1 and the third valve F3 are in the closed state. Then, the new energy power supply equipment inputs power into the alkaline electrolyzer assembly 20, controlling it to start up. At this time, the power required for the startup process of the alkaline electrolyzer assembly 20 is reduced because it uses the third hydrogen separator G5 and the third oxygen separator G6, which have lower processing capacities.

[0034] Furthermore, after the alkaline electrolysis unit 20 has successfully started up, if the power received by the alkaline electrolysis unit 20 relative to its full load reaches a preset ratio, then the alkaline electrolysis unit 20 can stably produce hydrogen, and the new energy power supply equipment will not experience insufficient power supply during startup. The preset ratio is a pre-defined limit used to determine if the alkaline electrolysis unit 20 can normally perform the hydrogen production process. For example, if the alkaline electrolysis unit 20 can normally perform the hydrogen production process at 30% full power, and the power received by the alkaline electrolysis unit 20 from the new energy power supply equipment reaches 30% of its full load, then the alkaline electrolysis unit 20 is considered to be able to normally perform the hydrogen production process, and even if there are some power fluctuations, these fluctuations can be absorbed by the proton exchange membrane electrolysis unit 10. Therefore, when the power received by the alkaline electrolysis unit 20 relative to its full load reaches the preset ratio, considering the low processing capacity of the third hydrogen separator G5 and the third oxygen separator G6, although hydrogen production can be stable, the hydrogen production volume is low. Therefore, when the alkaline electrolysis unit 20 is started and running stably, the second valve F2 and the fourth valve F4 can be controlled to be closed, while the first valve F1 and the third valve F3 can be controlled to be open. At this time, the separator on the alkaline electrolysis unit 20 is switched from the third hydrogen separator G5 and the third oxygen separator G6 to the first hydrogen separator G1 and the first oxygen separator G2, thereby effectively increasing the hydrogen production on the alkaline electrolysis unit 20.

[0035] Based on the first embodiment of the electrolytic hydrogen production system described above, a second embodiment of the electrolytic hydrogen production system of this application is proposed. (Refer to...) Figure 2 , Figure 2 This is a schematic diagram of the second embodiment of the electrolytic hydrogen production system proposed in this application.

[0036] In this embodiment, the electrolytic hydrogen production system further includes: a fifth valve F5, a sixth valve F6, an alkali cooler E1, and an alkali circulation pump P1; The first end of the fifth valve F5 is connected to the liquid output end of the first hydrogen separator G1 and the liquid output end of the first oxygen separator G2. The first end of the sixth valve F6 is connected to the liquid output end of the third hydrogen separator G5 and the liquid output end of the third oxygen separator G6. The second end of the fifth valve F5 is connected to the second end of the sixth valve F6 and the input end of the alkali cooler E1. The output end of the alkali cooler E1 is connected to the input end of the alkali circulation pump P1. The output end of the alkali circulation pump P1 is connected to the alkali return end of the alkaline electrolysis component 20.

[0037] It should be understood that during the electrolytic hydrogen production process, the liquid separated by the separator will flow back to the electrolytic cell through a liquid circulation pipeline, thereby preventing the rapid loss of electrolyte in the electrolytic cell. On the alkaline electrolysis component 20 side of the electrolytic hydrogen production system, considering that different hydrogen separators and oxygen separators will be used during startup, two liquid circulation pipelines need to be installed on the alkaline electrolysis component 20 side.

[0038] It should be noted that the fifth valve F5 is located between the liquid output end of the first hydrogen separator G1 and the alkali cooler E1, and between the liquid output end of the first oxygen separator G2 and the alkali cooler E1. This fifth valve F5 controls the flow of alkali solution between the first hydrogen separator G1, the first oxygen separator G2, and the alkali cooler E1. The sixth valve F5 is located between the liquid output end of the third hydrogen separator G5 and the alkali cooler E1, and between the liquid output end of the third oxygen separator G6 and the alkali cooler E1. This sixth valve F6 controls the flow of alkali solution between the third hydrogen separator G5, the third oxygen separator G6, and the alkali cooler E1. The alkali cooler E1 is used to cool the alkali solution after gas-liquid separation. This alkali cooler E1 prevents the alkali solution from being at a high temperature after the gas-liquid separation process. If this portion of the alkali solution flows back into the electrolytic cell within the electrolysis assembly 10, it may affect the temperature inside the electrolytic cell and thus the electrolysis process. The alkali circulation pump P1 is a device used to control the flow of alkali in the alkali circulation pipeline. The alkali circulation pump P1 can control the flow rate of alkali in the alkali circulation pipeline under different alkali reflux requirements.

[0039] It should be understood that, in actual use, considering that the hydrogen separator and oxygen separator used in the alkaline electrolysis unit 20 are different during startup and stable operation, the on / off state between different separators and the alkali cooler E1 can be controlled at different stages of the alkaline electrolysis unit 20. When one side of the alkaline electrolysis unit 20 is in the startup stage, the sixth valve F6 can be opened and the fifth valve F5 can be closed. The alkali solution obtained after separation by the third hydrogen separator G5 and the third oxygen separator G6 can flow into the alkali cooler E1 through the sixth valve F6. The alkali solution cooled by the alkali cooler E1 can be returned to the alkali return end of the alkaline electrolysis unit 20 through the alkali circulation pump P1. When the alkaline electrolysis unit 20 is in a stable operating phase, the fifth valve F5 can be opened and the sixth valve F6 can be closed. The alkaline solution obtained after separation by the first hydrogen separator G1 and the first oxygen separator G62 can flow into the alkaline solution cooler E1 through the fifth valve F5. The alkaline solution cooled by the alkaline solution cooler E1 can be returned to the alkaline solution return end of the alkaline electrolysis unit 20 through the alkaline solution circulation pump P1.

[0040] In this embodiment, the electrolytic hydrogen production system also includes: heat exchanger E2, seventh valve F7, eighth valve F8, and pure water circulation pump P2; The first end of the seventh valve F7 is connected to the liquid output end of the second hydrogen separator G3 and the liquid output end of the second oxygen separator G4. The first end of the eighth valve F8 is connected to the second end of the sixth valve F6, the second end of the fifth valve F5, and the input end of the alkali cooler E1. The second end of the seventh valve F7 is connected to the first end of the heat exchanger E2, the second end of the heat exchanger E2 is connected to the input end of the pure water circulation pump P2, and the output end of the pure water circulation pump P2 is connected to the pure water return end of the proton exchange membrane electrolysis module 10. The second end of the eighth valve F8 is connected to the third end of the heat exchanger E2, and the fourth end of the heat exchanger E2 is connected to the input end of the alkali circulation pump P1.

[0041] It should be understood that when the proton exchange membrane electrolysis unit 10 is started up, and the alkaline electrolysis unit 20 is started up, the proton exchange membrane electrolysis unit 10 is already in a stable hydrogen production state. The pure water separated by the second hydrogen separator G3 and the second oxygen separator G4 is at a relatively high temperature and requires cooling. However, during the start-up of the alkaline electrolysis unit 20, the alkaline solution temperature is typically low and requires heating before the alkaline electrolysis unit 20 can operate normally and stably.

[0042] It should be noted that heat exchanger E2 is a device used to exchange heat between the pure water separated by the separator on one side of the proton exchange membrane electrolysis unit 10 and the alkaline solution on the other side of the alkaline electrolysis unit 20. With the installation of heat exchanger E2, during the startup or initial stable operation of the alkaline electrolysis unit 20, when the temperature of the alkaline solution has not yet reached the temperature required for stable hydrogen production, the pure water that needs cooling on one side of the proton exchange membrane electrolysis unit 20 can be used to heat the alkaline solution that needs heating on the other side. Because the alkaline solution in the alkaline electrolysis unit 20 is preheated by the pure water within the proton exchange membrane electrolysis unit 20, the startup time is reduced, and the required power for heating is reduced. This effectively increases the rate of temperature rise of the alkaline solution on one side of the alkaline electrolysis unit 20, further accelerating the startup rate of the alkaline electrolysis unit 20. Furthermore, during the startup process of the alkaline electrolysis unit 20, no additional cooling structure is required for the proton exchange membrane electrolysis unit 10.

[0043] It should be understood that the seventh valve F7 is located between the second hydrogen separator G3 and the heat exchanger E2, and between the second oxygen separator G4 and the heat exchanger E2. The seventh valve F7 controls the flow of pure water generated in the second hydrogen separator G3 and the second oxygen separator G4 into the heat exchanger E2. The eighth valve F8 is located between the first hydrogen separator G1 or the third hydrogen separator G5 and the heat exchanger E2, and between the first oxygen separator G2 or the third oxygen separator G6 and the heat exchanger E2. The eighth valve F8 controls the flow of pure water generated in the first hydrogen separator G1 and the first oxygen separator G2, or the third hydrogen separator G5 or the third oxygen separator G6, into the heat exchanger E2. The pure water circulation pump P2 is a device used to control the flow state of pure water that needs to be returned to the pure water return end of the proton exchange membrane electrolysis module 10.

[0044] In the specific implementation process, when the alkaline solution on one side of the alkaline electrolysis component 20 needs to be heated and the pure water on the one side of the proton exchange membrane electrolysis component 10 needs to be cooled, the pure water and alkaline solution can be input to the heat exchanger E2 for heat exchange by controlling the opening of the seventh valve F7 and the eighth valve F8, and when either the fifth valve F5 or the sixth valve F6 is open.

[0045] The section between the first and second ends of heat exchanger E2 is the pure water flow section inside heat exchanger E2; the section between the third and fourth ends of heat exchanger E2 is the alkaline solution flow section inside heat exchanger E2.

[0046] In this embodiment, the electrolytic hydrogen production system further includes: a pure water cooler E3; The input end of the pure water cooler E3 is connected to the liquid output end of the second hydrogen separator G3, the liquid output end of the second oxygen separator G4, and the first end of the seventh valve F7; the output end of the pure water cooler E3 is connected to the input end of the pure water circulation pump P2.

[0047] It is understandable that after the alkaline solution on the alkaline electrolysis component 20 no longer needs to be heated, the pure water produced by the separator on the proton exchange membrane electrolysis component 10 still needs to be cooled. At this time, the heat exchanger E2 cannot properly cool the pure water, so an additional cooler is needed to cool the pure water on the proton exchange membrane electrolysis component 10.

[0048] It should be noted that the pure water cooler E3 is a device used to cool the pure water produced by the separator on one side of the proton exchange membrane electrolysis module 10. This pure water cooling module E3 can directly receive the pure water produced by the second hydrogen separator G3 and the second oxygen separator G4, thereby cooling the pure water on one side of the proton exchange membrane electrolysis module 10.

[0049] During operation, after the proton exchange membrane electrolysis unit 10 is started, valves F2, F4, F6, F8, and F7 are opened. In this state, the devices on the alkaline electrolysis unit 20 are activated. The alkaline solution separated by the third hydrogen separator G5 and the third oxygen separator G6 flows into the heat exchanger E2 through valves F6 and F8; the pure water separated by the second hydrogen separator G3 and the second oxygen separator G4 flows into the heat exchanger E2 through valve F7. After heat exchange in the heat exchanger E2, the pure water is returned to the pure water return end on the proton exchange membrane electrolysis unit 10 through the pure water circulation pump P2; the alkaline solution is returned to the alkaline solution return end on the alkaline electrolysis unit 20 through the alkaline solution circulation pump P1. After the devices on one side of the alkaline electrolysis assembly 20 have started up, the second valve F2 and the fourth valve F4 are closed, while the first valve F1, the third valve F3, and the fifth valve F5 are opened. At this time, the temperature of the alkaline solution has usually risen to the stable electrolysis temperature, and the seventh valve F7 and the eighth valve F8 are closed. In this state, the pure water flowing out of the separator on one side of the proton exchange membrane electrolysis assembly 10 can be cooled by the pure water cooler E3, and then the cooled pure water is returned to the pure water return end on the proton exchange membrane electrolysis assembly 10 through the pure water circulation pump P2. The alkaline solution produced by the first hydrogen separator G1 and the first oxygen separator G2 on one side of the alkaline electrolysis assembly 20 can be input to the alkaline solution cooler E1 through the fifth valve F5, and the cooled alkaline solution can be returned to the alkaline solution return end on the alkaline electrolysis assembly 20 through the alkaline solution circulation pump P1.

[0050] Based on the first or second embodiment of the electrolytic hydrogen production system described above, a third embodiment of the electrolytic hydrogen production system of this application is proposed.

[0051] Reference Figure 3 , Figure 3 This is a first structural schematic diagram of the third embodiment of the electrolytic hydrogen production system proposed in this application. In this embodiment, the electrolytic hydrogen production system further includes: a ninth valve F9 and a tenth valve F10; The first end of the ninth valve F9 is connected to the second end of the second valve F2 and the hydrogen output end of the first hydrogen separator G1, and the second end of the ninth valve F9 is connected to the third hydrogen separator G5; the first end of the tenth valve F10 is connected to the second end of the fourth valve F4 and the oxygen output end of the first oxygen separator G2, and the second end of the tenth valve F10 is connected to the third oxygen separator G6.

[0052] It should be understood that after the alkaline electrolysis unit 20 is started up, the first hydrogen separator G1 and the first oxygen separator G2 are used for gas-liquid separation on the alkaline electrolysis unit 20 side. At this time, the third hydrogen separator G5 and the third oxygen separator G6 are idle, resulting in a waste of resources from the unused third hydrogen separator G5 and the third oxygen separator G6.

[0053] Therefore, in this embodiment, after the alkaline electrolysis component 20 has been started normally, the third hydrogen separator G5 can be used to perform secondary separation of the hydrogen separated by the first hydrogen separator G1, and the third oxygen separator G6 can be used to perform secondary separation of the oxygen separated by the first oxygen separator G2, thereby using the third hydrogen separator G5 and the third oxygen separator G6 in the idle state to further increase the amount of gas generated on the alkaline electrolysis component 20.

[0054] It should be noted that the ninth valve, F9, is located between the hydrogen output end of the first hydrogen separator G1 and the input end of the third hydrogen separator G5, and is used to control the hydrogen flow between these two locations. The tenth valve, F10, is located between the oxygen output end of the first oxygen separator G2 and the input end of the third oxygen separator G6, and is used to control the oxygen flow between these two locations.

[0055] In practical implementation, since the alkaline electrolysis unit 20 is in a stable operating state, the second valve F2 and the fourth valve F4 are in the closed state, while the first valve F1 and the third valve F3 are in the open state. By controlling the opening of the ninth valve F9 and the tenth valve F10, the third hydrogen separator G5 can receive the hydrogen separated by the first hydrogen separator G1 and perform secondary gas-liquid separation; the third oxygen separator G6 can receive the oxygen separated by the first oxygen separator G2 and perform secondary gas-liquid separation. During this process, considering the alkali reflux, it is necessary to control both the fifth valve F5 and the sixth valve F6 to be in the open state.

[0056] Reference Figure 4 , Figure 4 This is a second structural schematic diagram of the third embodiment of the electrolytic hydrogen production system proposed in this application. In this embodiment, the electrolytic hydrogen production system further includes: an eleventh valve F11 and a twelfth valve F12; The first end of the eleventh valve F11 is connected to the hydrogen output end of the proton exchange membrane electrolysis assembly 10, and the second end of the eleventh valve F11 is connected to the input end of the third hydrogen separator G5. The first end of the twelfth valve F12 is connected to the oxygen output end of the proton exchange membrane electrolysis assembly 10, and the second end of the twelfth valve F12 is connected to the input end of the third oxygen separator G6.

[0057] Understandably, when the alkaline electrolysis unit 20 is operating stably, the third hydrogen separator G5 and the third oxygen separator G6, which are in an idle state, can not only serve as secondary separation devices for hydrogen and oxygen, but also as backup separators for the second hydrogen separator G3 and the second oxygen separator G4. For example, if the second hydrogen separator G3 or the second oxygen separator G4 malfunctions and cannot perform gas-liquid separation normally during hydrogen production, the third hydrogen separator G5 or the third oxygen separator G6 can be used to replace the corresponding second hydrogen separator G3 or the second oxygen separator G4 for gas-liquid separation, thereby avoiding a reduction in the hydrogen production of the entire electrolysis hydrogen production system due to a separator malfunction on the proton exchange membrane electrolysis unit 10 side.

[0058] It should be noted that the second end of the eleventh valve F11 can be directly connected to the input end of the third hydrogen separator G5, and the twelfth valve F12 can be directly connected to the input end of the third oxygen separator G6. By controlling the eleventh valve F11 and the twelfth valve F12, the third hydrogen separator G5 can be used as a backup separator for the second hydrogen separator G3, and the third oxygen separator G6 can be used as a backup separator for the second oxygen separator G4.

[0059] Reference Figure 5 , Figure 5This is a third structural schematic diagram of the third embodiment of the electrolytic hydrogen production system proposed in this application. When the ninth valve F9 and the tenth valve F10 are provided, the second end of the eleventh valve F11 can also be connected to the first end or the second end of the ninth valve F9, and the second end of the twelfth valve F12 can also be connected to the first end or the second end of the tenth valve F10.

[0060] It is understandable that, with the eleventh valve F11 and the twelfth valve F12 installed, the eleventh valve F11 is a valve installed between the hydrogen output end of the proton exchange membrane electrolysis assembly 10 and the third hydrogen separator G5, used to control the hydrogen flow between the hydrogen output end of the proton exchange membrane electrolysis assembly 10 and the third hydrogen separator G5; the twelfth valve F12 is a valve installed between the oxygen output end of the proton exchange membrane electrolysis assembly 10 and the third oxygen separator G6, used to control the oxygen flow between the oxygen output end of the proton exchange membrane electrolysis assembly 10 and the third oxygen separator G6.

[0061] In practical implementation, if a malfunction is detected in either the second hydrogen separator G3 or the second oxygen separator G4, the corresponding eleventh valve F11 or twelfth valve F12 can be opened to control the third hydrogen separator G5 or the third oxygen separator G6 to replace the malfunctioning second hydrogen separator G3 or second oxygen separator G4. Alternatively, if a malfunction is detected in either the second hydrogen separator G3 or the second oxygen separator G4, both the eleventh valve F11 and the twelfth valve F12 can be opened simultaneously, directly using the third hydrogen separator G5 and the third oxygen separator G6 to replace the second hydrogen separator G3 and the second oxygen separator G4. This avoids a reduction in hydrogen production from the electrolysis hydrogen production system due to malfunctions in the second hydrogen separator G3 and the second oxygen separator G4. For example, if the second hydrogen separator G3 malfunctions, the eleventh valve F11 can be opened to replace the second hydrogen separator G3 with the third hydrogen separator G5, while the second oxygen separator G4 can be used normally. Or, if the second hydrogen separator G3 malfunctions, both the eleventh valve F11 and the twelfth valve F12 can be opened to replace the second hydrogen separator G3 with the third hydrogen separator G5, and the second oxygen separator G4 with the third oxygen separator G6.

[0062] Furthermore, in this embodiment, considering the use of a third hydrogen separator G5 instead of a second hydrogen separator G3 and a third oxygen separator G6 instead of a second oxygen separator G4, the third hydrogen separator G5 and the third oxygen separator G6 will generate pure water during the gas-liquid separation process. The generated pure water needs to be returned to the pure water return end on the proton exchange membrane electrolysis assembly 10 side.

[0063] Therefore, in this embodiment, the electrolytic hydrogen production system also includes: the thirteenth valve F13, the fourteenth valve F14, and the fifteenth valve F15; The first end of the thirteenth valve F13 is connected to the liquid output end of the third hydrogen separator G5 and the liquid output end of the third oxygen separator G6, and the second end of the thirteenth valve F13 is connected to the input end of the pure water circulation pump inside the proton exchange membrane electrolysis assembly 10.

[0064] The first end of the fourteenth valve F14 is connected to the first end of the eleventh valve F11 and the hydrogen output end of the proton exchange membrane electrolysis assembly 10, and the second end of the fourteenth valve F14 is connected to the input end of the second hydrogen separator G3. The first end of the fifteenth valve F15 is connected to the first end of the twelfth valve F12 and the oxygen output end of the proton exchange membrane electrolysis assembly 10, and the second end of the fifteenth valve F15 is connected to the input end of the second oxygen separator G4.

[0065] It should be understood that the thirteenth valve F13 is used to control the pure water reflux between the liquid output end of the third hydrogen separator G5 and the liquid output end of the third oxygen separator G6 and the pure water reflux end of the proton exchange membrane electrolysis unit 10. The fourteenth valve F14 is used to control the connection between the hydrogen output end of the proton exchange membrane electrolysis unit 10 and the second hydrogen separator G3, and the fifteenth valve F15 is used to control the connection between the oxygen output end of the proton exchange membrane electrolysis unit 10 and the second oxygen separator G4. When the eleventh valve F11 and the twelfth valve F12 are closed, and the thirteenth valve F13, fourteenth valve F14, and fifteenth valve F15 are open, gas-liquid separation can be performed using the second hydrogen separator G3 and the second oxygen separator G4, and the pure water obtained after separation can be refluxed through the thirteenth valve F13. With valves F11, F12, and F13 open and valves F14 and F15 closed, gas-liquid separation can be performed using the third hydrogen separator G5 and the third oxygen separator G6. The pure water obtained after separation can be returned through valve F13.

[0066] When the third hydrogen separator G5 replaces the second hydrogen separator G3 and the third oxygen separator G6 replaces the second oxygen separator G4, the thirteenth valve F13 can be opened. The pure water produced by the third hydrogen separator G5 and the third oxygen separator G6 can be directly returned to the pure water return end of the proton exchange membrane electrolysis module 10 through the opened thirteenth valve F13.

[0067] In addition, considering the cooling and flow control of pure water, the second end of the thirteenth valve F13 can be connected to the input end of the pure water cooler E3. The pure water through the opened thirteenth valve F13 can be cooled by the pure water cooler E3 and then flow back to the pure water return end of the proton exchange membrane electrolysis module 10 after the pure water circulation pump P2 controls the flow state.

[0068] Based on any of the above embodiments of the electrolytic hydrogen production system, a fourth embodiment of the electrolytic hydrogen production system of this application is proposed. (Refer to...) Figure 6 , Figure 6 This is a schematic diagram of the fourth embodiment of the electrolytic hydrogen production system proposed in this application.

[0069] In this embodiment, the electrolytic hydrogen production system further includes: a first and a second temperature transmitter; The first temperature transmitter T1 is installed at the hydrogen output end of the first hydrogen separator G1 or the oxygen output end of the first oxygen separator G2. The second temperature transmitter T2 is installed at the hydrogen output end of the second hydrogen separator G3 or the oxygen output end of the second oxygen separator G4. The controller is also connected to the seventh valve F7, the eighth valve F8, and the alkali circulation pump P1 in the electrolysis hydrogen production system.

[0070] It should be noted that during the process of heating the alkaline solution with pure water through heat exchanger E2, the heat exchange capacity of heat exchanger E2 needs to be strictly controlled to prevent the pure water temperature from being too low or too high due to unsuitable heat exchange. For example, if the pure water needs to be cooled from the first temperature to the second temperature, but the temperature of the alkaline solution is too low or too high, causing the pure water to cool from the second temperature to the third temperature, the pure water at the third temperature will flow back to the pure water return end of the proton exchange membrane electrolysis module 10. This will result in an unsuitable temperature inside the electrolyzer, affecting the electrolysis process.

[0071] To control the heat exchange process, this embodiment includes a first temperature transmitter T1 and a second temperature transmitter T2. The first temperature transmitter T1 can be a single transmitter located at the hydrogen output terminal of the first hydrogen separator G1 or the oxygen output terminal of the first oxygen separator G2, or two transmitters located at the hydrogen output terminals of the first hydrogen separator G1 and the oxygen output terminals of the first oxygen separator G2, respectively, to collect the alkaline solution circulation temperature of the alkaline electrolysis unit 20. Similarly, the second temperature transmitter T2 can be a single transmitter located at the hydrogen output terminal of the second hydrogen separator G3 or the oxygen output terminal of the second oxygen separator G4; or two transmitters located at the hydrogen output terminal of the second hydrogen separator G3 or the oxygen output terminal of the second oxygen separator G4, respectively, to collect the pure water circulation temperature of the proton exchange membrane electrolysis unit 10.

[0072] The first temperature transmitter T1 and the second temperature transmitter T2 can use thermistors as core components to collect the circulating temperatures of the alkali solution and the pure water. After detecting the temperature of the corresponding area, the first temperature transmitter T1 and the second temperature transmitter T2 can provide feedback to control various valves, pumps, and heat exchangers based on the corresponding pure water and alkali temperatures, ensuring that the electrolytic hydrogen production is in a stable temperature state.

[0073] In addition, the electrolysis hydrogen production system also includes a controller ( Figure 6 (Not shown), the controller is connected to each valve, circulating pump and heat exchanger in the electrolysis hydrogen production system, and is used to control the opening degree of each valve, each circulating pump and the heat exchanger during the start-up of the alkaline electrolysis component and the proton exchange membrane electrolysis component.

[0074] Both the first temperature transmitter T1 and the second temperature transmitter T2 are connected to the controller. The controller can determine the alkaline solution circulation temperature and the pure water circulation temperature based on the temperature signals corresponding to the alkaline solution circulation temperature and the pure water circulation temperature output by the first temperature transmitter T1 and the second temperature transmitter T2.

[0075] Understandably, during the heat exchange process via heat exchanger E2, the seventh valve F7, the eighth valve F8, and the alkali circulation pump P1 can all control the amount of heat exchanged. Specifically, the seventh valve F7 and the eighth valve F8 control the flow rate of pure water and alkali solution during the heat exchange process, while the alkali circulation pump P1 controls the flow rate of the alkali solution.

[0076] Therefore, during the startup of the alkaline electrolysis unit 20, the controller can control the opening of the seventh valve, the eighth valve, and the alkaline circulation pump based on the alkaline circulation temperature collected by the first temperature transmitter T1 and the pure water circulation temperature collected by the second temperature transmitter T2. This controls the pure water flow rate, alkaline flow rate, and alkaline flow rate during the heat exchange process, ensuring that the pure water circulation temperature after heat exchange is the temperature required for return to the proton exchange membrane electrolysis unit 10. For example, during the startup of the alkaline electrolysis unit 20, the alkaline circulation temperature continuously increases. As the alkaline circulation temperature rises, the cooling effect on the pure water gradually deteriorates. To ensure the cooling effect of the pure water, the opening of the eighth valve F8 can be increased or the power of the alkaline circulation pump P1 can be increased to avoid insufficient cooling of the pure water. In addition, the controller can also be connected to any of the above-mentioned valves, circulation pumps, and heat exchangers to control the operating status of each valve, circulation pump, and heat exchanger.

[0077] Furthermore, during the cooling of the alkali solution using pure water via heat exchanger E2, as the circulating temperature of the alkali solution within the alkaline electrolysis unit 20 continuously rises, once the circulating temperature reaches the pure water circulating temperature, it becomes impossible to heat the alkali solution using heat exchanger E2. Moreover, after the alkaline electrolysis unit 20 has completed startup, the circulating temperature of the alkali solution will also exceed the pure water circulating temperature, at which point the pure water circulating temperature cannot be effectively cooled by the heat exchanger.

[0078] Therefore, in this embodiment, the controller is connected to the pure water circulation pump P2 in the electrolysis hydrogen production system. It is also used to control the seventh valve F7 and the eighth valve F8 to stop the input of pure water and alkali to the heat exchanger E2 when the alkaline solution circulation temperature is higher than the pure water circulation temperature. It also controls the pure water circulation pump P2 to start, and uses the pure water circulation pump P2 to control the flow rate of pure water circulation and the pure water cooler E3 to cool and control the pure water circulation temperature.

[0079] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An electrolytic hydrogen production system, characterized in that, include: The system comprises an alkaline electrolysis unit, a proton exchange membrane electrolysis unit, a first hydrogen separator, a first oxygen separator, a second hydrogen separator, a second oxygen separator, a third hydrogen separator, and a third oxygen separator; wherein the processing capacity of the third hydrogen separator is lower than that of the first hydrogen separator, and the processing capacity of the third oxygen separator is lower than that of the first oxygen separator. The power supply terminals of the alkaline electrolysis component and the proton exchange membrane electrolysis component are both connected to the power output terminal of the new energy power supply equipment. The hydrogen output terminal of the alkaline electrolysis unit is connected to the first hydrogen separator via a first valve and to the third hydrogen separator via a second valve; the oxygen output terminal of the alkaline electrolysis unit is connected to the first oxygen separator via a third valve and to the third oxygen separator via a fourth valve. The hydrogen output terminal of the proton exchange membrane electrolysis unit is connected to the second hydrogen separator, and the oxygen output terminal of the proton exchange membrane electrolysis unit is connected to the second oxygen separator.

2. The electrolytic hydrogen production system as described in claim 1, characterized in that, The electrolytic hydrogen production system also includes: a fifth valve, a sixth valve, an alkali cooler, and an alkali circulation pump; The first end of the fifth valve is connected to the liquid output end of the first hydrogen separator and the liquid output end of the first oxygen separator. The first end of the sixth valve is connected to the liquid output end of the third hydrogen separator and the liquid output end of the third oxygen separator. The second end of the fifth valve is connected to the second end of the sixth valve and the input end of the alkali cooler. The output end of the alkali cooler is connected to the input end of the alkali circulation pump. The output end of the alkali circulation pump is connected to the alkali return end of the alkaline electrolysis component.

3. The electrolytic hydrogen production system as described in claim 2, characterized in that, The electrolytic hydrogen production system also includes: a heat exchanger, a seventh valve, an eighth valve, and a pure water circulation pump; The first end of the seventh valve is connected to the liquid output end of the second hydrogen separator and the liquid output end of the second oxygen separator, and the first end of the eighth valve is connected to the second end of the sixth valve, the second end of the fifth valve, and the input end of the alkali cooler; The second end of the seventh valve is connected to the first end of the heat exchanger, the second end of the heat exchanger is connected to the input end of the pure water circulation pump, and the output end of the pure water circulation pump is connected to the pure water return end of the proton exchange membrane electrolysis assembly. The second end of the eighth valve is connected to the third end of the heat exchanger, and the fourth end of the heat exchanger is connected to the input end of the alkali circulation pump.

4. The electrolytic hydrogen production system as described in claim 3, characterized in that, The electrolytic hydrogen production system also includes: a pure water cooler; The input end of the pure water cooler is connected to the liquid output end of the second hydrogen separator, the liquid output end of the second oxygen separator, and the first end of the seventh valve; the output end of the pure water cooler is connected to the input end of the pure water circulation pump.

5. The electrolytic hydrogen production system as described in claim 3, characterized in that, The electrolytic hydrogen production system also includes: a ninth valve and a tenth valve; The first end of the ninth valve is connected to the second end of the second valve and the hydrogen output end of the first hydrogen separator, and the second end of the ninth valve is connected to the third hydrogen separator. The first end of the tenth valve is connected to the second end of the fourth valve and the oxygen output end of the first oxygen separator, and the second end of the tenth valve is connected to the third oxygen separator.

6. The electrolytic hydrogen production system as described in claim 5, characterized in that, The electrolytic hydrogen production system also includes: an eleventh valve and a twelfth valve; The first end of the eleventh valve is connected to the hydrogen output end of the proton exchange membrane electrolysis assembly, and the second end of the eleventh valve is connected to the third hydrogen separator. The first end of the twelfth valve is connected to the oxygen output end of the proton exchange membrane electrolysis assembly, and the second end of the twelfth valve is connected to the third oxygen separator.

7. The electrolytic hydrogen production system as described in claim 6, characterized in that, The electrolytic hydrogen production system also includes: a thirteenth valve, a fourteenth valve, and a fifteenth valve; The first end of the thirteenth valve is connected to the liquid output end of the third hydrogen separator and the liquid output end of the third oxygen separator, and the second end of the thirteenth valve is connected to the input end of the pure water circulation pump in the proton exchange membrane electrolysis assembly. The first end of the fourteenth valve is connected to the first end of the eleventh valve and the hydrogen output end of the proton exchange membrane electrolysis assembly, and the second end of the fourteenth valve is connected to the input end of the second hydrogen separator. The first end of the fifteenth valve is connected to the first end of the twelfth valve and the oxygen output end of the proton exchange membrane electrolysis assembly, and the second end of the fifteenth valve is connected to the input end of the second oxygen separator.

8. The electrolytic hydrogen production system according to any one of claims 3 to 7, characterized in that, The electrolytic hydrogen production system also includes: a first and a second temperature transmitter; The first temperature transmitter is installed at the hydrogen output end of the first hydrogen separator or the oxygen output end of the first oxygen separator. The second temperature transmitter is located at the hydrogen output end of the second hydrogen separator or the oxygen output end of the second oxygen separator.

9. The electrolytic hydrogen production system as described in claim 8, characterized in that, The electrolysis hydrogen production system also includes: a controller; The controller is connected to each valve, circulating pump, and heat exchanger in the electrolysis hydrogen production system, and is used to control the opening degree of each valve, each circulating pump, and the heat exchanger during the start-up process of the alkaline electrolysis component and the proton exchange membrane electrolysis component.

10. The electrolytic hydrogen production system as described in claim 9, characterized in that, The controller is connected to the pure water circulation pump in the electrolytic hydrogen production system, and is also used to control the seventh valve and the eighth valve to shut down when the alkaline solution circulation temperature is higher than the pure water circulation temperature.

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