Water electrolysis hydrogen production system

Abstract

The utility model discloses a water electrolysis hydrogen production system, and relates to the technical field of hydrogen production, the water electrolysis hydrogen production system is provided with a gas outlet, the water electrolysis hydrogen production system comprises an electrolytic bath, a gas-liquid separator, a gas-water separator and a buffer container, and the gas-water separator, the buffer container and the gas-liquid separator are sequentially distributed from top to bottom; and at least one of the gas-water separator and the gas-liquid separator can be communicated with the buffer container through the balance pipe to form a balance gas path. According to the technical scheme, at least one of the gas-water separator and the gas-liquid separator can be communicated with the buffer container through the balance pipe to form the balance gas path, so that the pressure in the buffer container is balanced with the pressure of at least one of the gas-water separator and the gas-liquid separator; therefore, the whole process of discharging the liquid phase in the gas-water separator to the gas-liquid separator is smoother, and the liquid discharging efficiency between the gas-water separator and the gas-liquid separator is improved.

Description

Technical Field

[0001] This application relates to the field of hydrogen production technology by water electrolysis, and in particular to a hydrogen production system by water electrolysis. Background Technology

[0002] In the water electrolysis hydrogen production process, the liquid phase separated by the gas-liquid separator needs to be discharged into the gas-liquid separator to achieve liquid phase recovery and reuse. In related technologies, the bottom of the gas-liquid separator is directly connected to the gas-liquid separator and extends below the liquid surface. However, this direct discharge method requires a significant height difference between the gas-liquid and gas-liquid separators, and the discharge process is often inefficient and incomplete. Utility Model Content

[0003] The main objective of this application is to propose a water electrolysis hydrogen production system that aims to improve the liquid discharge efficiency between the gas-water separator and the gas-liquid separator.

[0004] To achieve the above objectives, the water electrolysis hydrogen production system proposed in this application has a gas outlet, including:

[0005] The electrolytic cell is connected to the gas outlet via an electrolysis product flow path;

[0006] A gas-liquid separator and a gas-water separator are distributed sequentially from upstream to downstream along the electrolysis product flow path. The gas-water separator is also connected to the gas-liquid separator through a drainage flow path, and the drainage flow path is equipped with a switch valve.

[0007] The buffer container, the gas-liquid separator, and the gas-water separator are distributed sequentially from top to bottom and along the upstream to downstream of the drainage path. At least one of the gas-liquid separator and the gas-liquid separator can be connected to the buffer container through a balance pipe to form a balanced gas path.

[0008] In one embodiment, the balancing pipe includes a first balancing pipe, and the buffer container is connected to the gas-water separator through the first balancing pipe.

[0009] In one embodiment, the buffer container is connected to the gas-liquid separator via a first drain pipe, and the switching valve includes a first switching valve disposed on the first drain pipe.

[0010] In one embodiment, one end of the first balance tube is connected to the gas-water separator, and the other end is connected to the liquid inlet of the first switching valve.

[0011] In one embodiment, the first switching valve is positioned close to the buffer container.

[0012] In one embodiment, the water electrolysis hydrogen production system further includes a scrubber distributed between the gas-liquid separator and the gas-water separator in the electrolysis product flow path, and the buffer container is configured as the shell of the scrubber.

[0013] In one embodiment, the water electrolysis hydrogen production system further includes a scrubber, which is distributed between the gas-liquid separator and the gas-water separator in the electrolysis product flow path, and the buffer container is set independently of the scrubber.

[0014] In one embodiment, the balancing pipe includes a second balancing pipe, and the buffer container is connected to the gas-liquid separator through the second balancing pipe.

[0015] In one embodiment, the buffer container is connected to the gas-liquid separator via a second drain pipe, and the switching valve includes a second switching valve disposed on the second drain pipe.

[0016] In one embodiment, one end of the second balance tube is connected to the buffer container, and the other end is connected to the inlet of the second switching valve.

[0017] In one embodiment, the second switching valve is located near the gas-liquid separator.

[0018] In one embodiment, the water electrolysis hydrogen production system further includes a liquid level sensor, which is located in the gas-water separator and is capable of acquiring the liquid level within the gas-water separator.

[0019] In one embodiment, the switching valve includes a first switching valve and a second switching valve. The first switching valve is located between the gas-liquid separator and the buffer container, and the second switching valve is located between the buffer container and the gas-liquid separator. At least one of the first switching valve and the second switching valve is electrically connected to the liquid level sensor.

[0020] The technical solution of this application enables at least one of the gas-liquid separator and the gas-water separator to form a balanced gas path through a balance pipe and a buffer container. This balances the pressure in the buffer container with the pressure of at least one of the gas-liquid separator and the gas-water separator, making the overall process of liquid phase discharge from the gas-liquid separator to the gas-liquid separator smoother. This improves the liquid discharge efficiency between the gas-liquid separator and the gas-liquid separator, reduces the height difference requirement between the gas-liquid separator and the gas-liquid separator, and avoids excessively high skids in the water electrolysis hydrogen production system, thereby reducing the equipment cost of the water electrolysis hydrogen production system. Attached Figure Description

[0021] 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.

[0022] Figure 1 A water electrolysis hydrogen production system according to an embodiment of this application;

[0023] Figure 2 Another embodiment of the water electrolysis hydrogen production system provided in this application;

[0024] Figure 3 Another embodiment of the water electrolysis hydrogen production system provided in this application;

[0025] Figure 4 This application provides another embodiment of a water electrolysis hydrogen production system;

[0026] Figure 5 A water electrolysis hydrogen production system according to another embodiment of this application.

[0027] Explanation of icon numbers:

[0028] 10. Water electrolysis hydrogen production system; 100. Electrolyzer; 200. Gas-liquid separator; 300. Gas-water separator; 400. Buffer container; 500. Scrubber; 600. Liquid level sensor; 710. First balance pipe; 720. Second balance pipe; 810. First drain pipe; 820. Second drain pipe; 910. First switch valve; 920. Second switch valve.

[0029] 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

[0030] 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 implementation methods obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0031] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are 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 with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0033] This application proposes a water electrolysis hydrogen production system 10.

[0034] Please see Figures 1 to 4 In one embodiment of this application, the water electrolysis hydrogen production system 10 has a gas outlet. The water electrolysis hydrogen production system 10 includes an electrolyzer 100, a gas-liquid separator 200, a gas-water separator 300, and a buffer container 400. The electrolyzer 100 is connected to the gas outlet through an electrolysis product flow path. The gas-liquid separator 200 and the gas-water separator 300 are distributed sequentially from upstream to downstream along the electrolysis product flow path. The gas-water separator 300 is also connected to the gas-liquid separator 200 through a drainage flow path, and the drainage flow path is equipped with a switch valve. The gas-water separator 300, the buffer container 400, and the gas-liquid separator 200 are distributed sequentially from top to bottom and from upstream to downstream along the drainage flow path. At least one of the gas-water separator 300 and the gas-liquid separator 200 can be connected to the buffer container 400 through a balance pipe to form a balanced gas path.

[0035] Specifically, the electrolyzer 100 is used to decompose water into hydrogen and oxygen. The electrolyzer 100 typically includes a pair of electrodes (cathode and anode) and an electrolyte solution. Taking an alkaline electrolyzer 100 as an example, the electrolyte solution is usually KOH alkaline solution. When direct current is applied to the electrodes, the water in the electrolyzer 100 decomposes on the electrode surface and is reduced to hydrogen and hydroxide ions at the cathode, and oxidized to oxygen and hydrogen ions at the anode. The gas generated on the corresponding electrode surface of the electrolyzer 100 carries a small amount of alkaline solution. The gas-liquid mixture exiting the electrolysis product outlet of the electrolyzer 100 is either a hydrogen-alkali gas-liquid mixture or an oxygen-alkali gas-liquid mixture. The gas-liquid mixture flows between the electrolysis product outlet of the electrolyzer 10 and the gas outlet of the water electrolysis hydrogen production system 10, undergoing sequential gas-liquid separation, washing and cooling, and gas-water separation. This flow path is the electrolysis product flow path of the water electrolysis hydrogen production system 10.

[0036] The gas-liquid separator 200 is used for the initial separation of alkaline solution from the gas-liquid mixture. The gas-water separator 300 separates moisture from the washed gas, ensuring that the gas discharged from the outlet is as dry as possible, which helps to reduce the impact of the gas's moisture content on subsequent processing or storage equipment.

[0037] After the gas-liquid mixture leaves the electrolytic cell 100, it enters the gas-liquid separator 200 along the electrolysis product flow path. After preliminary separation in the gas-liquid separator 200, the liquid phase remains in the gas-liquid separator 200, while the gas phase, after washing and cooling, enters the gas-liquid separator 300. After gas-liquid separation in the gas-liquid separator 300, crude hydrogen or crude oxygen is obtained. The crude hydrogen or crude oxygen leaves the water electrolysis hydrogen production system 10 from the gas outlet. The liquid phase inside the gas-liquid separator 300 flows into the gas-liquid separator 200, merges with the original liquid phase in the gas-liquid separator 200, and then flows back into the electrolytic cell 100 to continue the electrolysis reaction.

[0038] A drainage path is provided between the gas-liquid separator 300 and the gas-liquid separator 200, allowing the liquid phase within the gas-liquid separator 300 to flow into the gas-liquid separator 200 through the drainage path. The drainage path is equipped with a switch valve, which can control the opening and closing of a portion of the drainage path between the gas-liquid separator 300 and the buffer container 400, and / or control the opening and closing of a portion of the drainage path between the gas-liquid separator 200 and the buffer container 400.

[0039] The buffer container 400 can be a hollow shell, such as a water tank; or it can be an enlarged pipe, container, or other structure capable of storing materials. The buffer container 400 serves to prevent backflow, avoiding the direct backflow of gas and liquid phases from the gas-liquid separator 200 into the gas-liquid separator 300.

[0040] In one embodiment, the gas-liquid separator 300 is connected to the buffer container 400 via a balance pipe to form a balanced gas path. When it is necessary to discharge the liquid phase in the gas-liquid separator 300 into the buffer container 400, the liquid phase at the bottom of the gas-liquid separator 300 flows into the gas phase space of the buffer container 400 through a partial drainage path. When the liquid phase flow stops, the end of the drainage path near the buffer container 400 is in the gas phase, and the other end near the gas-liquid separator 300 is in the liquid phase. The drainage process is not smooth and sufficient, and the liquid phase in the gas-liquid separator 300 is difficult to completely drain. This application solves this problem by setting a balance pipe between the gas-liquid separator 300 and the buffer container 400, so that the gas phase space of the gas-liquid separator 300 and the gas phase space of the buffer container 400 are connected, so that the pressure of the gas-liquid separator 300 and the pressure of the buffer container 400 are balanced, reducing the drainage resistance between the gas-liquid separator 300 and the buffer container 400, and achieving efficient drainage of the gas-liquid separator 300.

[0041] In another embodiment, the gas-liquid separator 200 can be connected to the buffer container 400 through a balance pipe to form a balanced gas path. When it is necessary to discharge the liquid phase in the buffer container 400 into the gas-liquid separator 200, the liquid phase in the buffer container 400 flows into the gas phase space of the gas-liquid separator 200 through a partial drainage path. When the liquid phase flow stops, the end of the drainage path near the gas-liquid separator 200 is the gas phase, and the other end near the buffer container 400 is the liquid phase. The drainage process is not smooth and sufficient, and the liquid phase in the buffer container 400 is difficult to be completely discharged. This application connects the gas phase space of the gas-liquid separator 200 and the buffer container 400 by setting a balance pipe between them, so that the pressure of the gas-liquid separator 200 and the buffer container 400 is balanced, reducing the drainage resistance between the buffer container 400 and the gas-liquid separator 200, and achieving efficient drainage of the buffer container 400.

[0042] In another embodiment, both the gas-liquid separator 300 and the gas-liquid separator 200 can be connected through a balance pipe and a buffer container 400 to form a balanced gas path. The drainage process and principle between the gas-liquid separator 300 and the buffer container 400, and between the buffer container 400 and the gas-liquid separator 200, are the same as in the above embodiments, and will not be repeated here.

[0043] The technical solution of this application enables at least one of the gas-liquid separator 300 and the gas-liquid separator 200 to form a balanced gas path through a balance pipe and a buffer container 400. This balances the pressure in the buffer container 400 with the pressure of at least one of the gas-liquid separator 300 and the gas-liquid separator 200, thus making the overall process of liquid phase discharge from the gas-liquid separator 300 to the gas-liquid separator 200 smoother. This improves the liquid discharge efficiency between the gas-liquid separator 300 and the gas-liquid separator 200, reduces the height difference requirement between the gas-liquid separator 300 and the gas-liquid separator 200, and avoids the skid of the water electrolysis hydrogen production system 10 being too high, thereby reducing the equipment cost of the water electrolysis hydrogen production system 10.

[0044] In one implementation, please refer to Figure 1 and Figure 2 The balance pipe includes a first balance pipe 710, and the buffer container 400 is connected to the gas-water separator 300 through the first balance pipe 710.

[0045] The gas-liquid separator 300 can be connected to the buffer container 400 through the first balance pipe 710 to form a balanced gas path. Through the first balance pipe 710, the pressure in the buffer container 400 can be synchronized with the pressure in the gas-liquid separator 300, thereby promoting the smooth discharge of the liquid phase in the gas-liquid separator 300 into the buffer container 400 and improving the liquid discharge efficiency between the buffer container 400 and the gas-liquid separator 300.

[0046] In one implementation, please refer to Figure 1 and Figure 2 The buffer container 400 is connected to the gas-liquid separator 300 through the first drain pipe 810. The switching valve includes a first switching valve 910, which is located on the first drain pipe 810.

[0047] The first drain pipe 810 connects the buffer container 400 and the gas-liquid separator 300, ensuring that the liquid phase in the gas-liquid separator 300 can be discharged into the buffer container 400. The distance between the gas-liquid separator 300 and the buffer container 400 can be flexibly adjusted via the first drain pipe 810. A first switching valve 910 is installed on the first drain pipe 810 to control the opening and closing of the drainage path between the gas-liquid separator 300 and the buffer container 400, thereby flexibly controlling the timing and flow rate of liquid phase discharge from the gas-liquid separator 300 and ensuring the stable operation of the water electrolysis hydrogen production system 10.

[0048] In other embodiments, the gas-water separator 300 and the buffer container 400 can also be connected by welding or by flange.

[0049] In one implementation, please refer to Figure 1 and Figure 2 One end of the first balance pipe 710 is connected to the gas-water separator 300, and the other end is connected to the liquid inlet of the first switching valve 910.

[0050] The first switch valve 910, connected to the inlet of the first balance pipe 710, controls the opening and closing of the balance air path between the gas-liquid separator 300 and the buffer container 400. By using a single first switch valve 910, both the first balance pipe 710 and the first drain pipe 810 can be controlled simultaneously, reducing the number of first switch valves 910 required. The first switch valve 910 can be configured with two outlets: one outlet connected to the gas-liquid separator 300 via the first balance pipe 710, and the other outlet connected to the gas-liquid separator 300 via the first drain pipe 810; alternatively, the first switch valve 910 can be configured with one outlet, connected to the gas-liquid separator 300 via the first drain pipe 810, with the first balance pipe 710 connected to the first drain pipe 810.

[0051] In other embodiments, a switching valve may be provided on the first balance pipe 710 to independently control the on / off state of the first balance pipe 710.

[0052] In one implementation, please refer to Figure 1 and Figure 2 The first switching valve 910 is positioned near the buffer container 400.

[0053] The first switching valve 910 is located near the buffer container 400. The pressure at the end of the first balancing pipe 710 near the buffer container 400 is closer to the pressure inside the buffer container 400. As a result, the pressure inside the buffer container 400 is closer to the pressure inside the gas-water separator 300, and they are relatively more balanced. Consequently, the liquid discharge process of the gas-water separator 300 is smoother.

[0054] In other embodiments, the first switching valve 910 may also be located near the middle of the first balancing pipe 710 or near the gas-water separator 300.

[0055] In one implementation, please refer to Figure 2 and Figure 4 The water electrolysis hydrogen production system 10 also includes a scrubber 500, which is distributed between the gas-liquid separator 200 and the gas-water separator 300 in the electrolysis product flow path, and the buffer container 400 is configured as the shell of the scrubber 500.

[0056] The gas-liquid separator 200 and the scrubber 500 are connected by a balance pipe to form a balanced gas path, which balances the pressure inside the scrubber 500 with the pressure inside the gas-liquid separator 300. This makes the discharge of liquid phase from the gas-liquid separator 300 to the scrubber 500 smoother and improves the drainage efficiency between the gas-liquid separator 300 and the scrubber 500. Simultaneously, the liquid phase from the gas-liquid separator 300 flows into the scrubber 500 through a drainage path, increasing the water volume inside the scrubber 500 and thus reducing the alkali content in the crude gas. Furthermore, by configuring the buffer container 400 as the shell of the scrubber 500, the buffer container 400 and the scrubber 500 are integrated, reducing the number of devices, pipes, and valves, lowering the complexity and leakage risk of the water electrolysis hydrogen production system 10, improving the reliability of the water electrolysis hydrogen production system 10, simplifying equipment installation and maintenance, and reducing manufacturing and maintenance costs.

[0057] In one implementation, please refer to Figure 1 and Figure 3 The water electrolysis hydrogen production system 10 also includes a scrubber 500, which is distributed between the gas-liquid separator 200 and the gas-water separator 300 in the electrolysis product flow path. The buffer container 400 is set independently of the scrubber 500.

[0058] The buffer container 400 and the scrubber 500 are two separate devices, installed independently. The scrubber 500 is located in the electrolysis product flow path and connected to a pure water source. It is used to wash and dealkalize the gas-liquid mixture to remove alkaline solutions. The pure water also serves as a supplement to the electrolyte solution. The temperature of the gas-liquid mixture exiting the electrolytic cell 100 is typically high, reaching over 60°C, while the pure water is usually at room temperature or low temperature, below 25°C. When the pure water enters the scrubber 500 to wash and dealkalize the gas-liquid mixture, it also cools the mixture, thus the scrubber 500 acts as a cooler, integrating washing and cooling functions. After preliminary separation in the gas-liquid separator 200, the liquid phase remains in the separator, while the gas phase enters the scrubber 500 for washing, dealkalization, and cooling. The washed and cooled gas phase then enters the gas-liquid separator 300 for gas-liquid separation.

[0059] A buffer container 400 is installed in the drainage path. At least one of the gas-liquid separators 300 and 200 can be connected to the buffer container 400 via a balance pipe to form a balanced gas path, making the drainage between the gas-liquid separator 300 and the gas-liquid separator 200 smoother and improving their drainage efficiency. The buffer container 400 is installed independently of the scrubber 500, which not only ensures the overall pressure balance within the water electrolysis hydrogen production system 10 but also reduces mutual interference between devices, enhancing the overall stability of the water electrolysis hydrogen production system 10.

[0060] In one implementation, please refer to Figure 1 and Figure 3 The balance pipe includes a second balance pipe 720, and the buffer container 400 is connected to the gas-liquid separator 200 through the second balance pipe 720.

[0061] The gas-liquid separator 200 can be connected to the buffer container 400 through the second balance pipe 720 to form a balanced gas path. Through the second balance pipe 720, the pressure inside the buffer container 400 can be synchronized with the pressure inside the gas-liquid separator 200, thereby promoting the smooth discharge of the liquid phase in the buffer container 400 into the gas-liquid separator 200 and improving the drainage efficiency between the buffer container 400 and the gas-liquid separator 200.

[0062] In one implementation, please refer to Figure 1 and Figure 3 The buffer container 400 is connected to the gas-liquid separator 200 through the second drain pipe 820. The switching valve includes a second switching valve 920, which is located on the second drain pipe 820.

[0063] The second drain pipe 820 connects the buffer container 400 and the gas-liquid separator 200, ensuring that the liquid phase in the buffer container 400 can be discharged into the gas-liquid separator 200. The distance between the gas-liquid separator 200 and the buffer container 400 can be flexibly adjusted via the second drain pipe 820. A second switching valve 920 is installed on the second drain pipe 820 to control the opening and closing of the drainage path between the gas-liquid separator 200 and the buffer container 400, thereby flexibly controlling the timing and flow rate of liquid phase discharge from the buffer container 400 and ensuring the stable operation of the water electrolysis hydrogen production system 10. In other embodiments, the gas-liquid separator 200 and the buffer container 400 can also be connected by welding or by a flange.

[0064] Understandably, please refer to Figure 1 In an embodiment where the buffer container 400 and the washer 500 are independently configured, the buffer container 400 is connected to the gas-liquid separator 300 via a first drain pipe 810 and a first balance pipe 710, and to the gas-liquid separator 200 via a second drain pipe 820 and a second balance pipe 720. When the first switch valve 910 is open, the second switch valve 920 is closed, allowing the liquid phase in the gas-liquid separator 300 to be smoothly discharged into the buffer container 400 through the first drain pipe 810 under the facilitating action of the first balance pipe 710. Since the second switch valve 920 is closed at this time, neither the gas phase nor the liquid phase in the gas-liquid separator 200 can be drawn back into the buffer container 400 or the gas-liquid separator 300. When the second switch valve 920 is open, the first switch valve 910 is closed, allowing the liquid phase in the buffer container 400 to be smoothly discharged into the gas-liquid separator 200 through the second drain pipe 820 under the facilitating action of the second balance pipe 720. Since the first switch valve 910 is closed at this time, neither the gas phase nor the liquid phase in the gas-liquid separator 200 can be drawn back into the gas-water separator 300.

[0065] Please see Figure 2 In another embodiment where the buffer container 400 is configured as the housing of the washer 500, the washer 500 is connected to the gas-water separator 300 through the first drain pipe 810 and the first balance pipe 710. When the first switch valve 910 is opened, the liquid phase in the gas-water separator 300 can be smoothly discharged into the washer 500 through the first drain pipe 810 under the promotion of the first balance pipe 710.

[0066] Please see Figure 4A partial electrolysis product flow path is formed between the scrubber 500 and the gas-liquid separator 200 to achieve gas connection between the scrubber 500 and the gas-liquid separator 200. A partial return liquid flow path is also formed between the scrubber 500 and the gas-liquid separator 200, through which pure water in the scrubber 500 flows back to the electrolytic cell 100 after passing through the gas-liquid separator 200. The electrolysis product flow path between the scrubber 500 and the gas-liquid separator 200 serves as a balancing gas path, and the scrubber 500 and the gas-liquid separator 200 serve as a drainage flow path. Therefore, it is not necessary to additionally install a second drain pipe 820, a second balancing pipe 720, and a second switching valve 920 between the scrubber 500 and the gas-liquid separator 200, further reducing the number of devices.

[0067] In one implementation, please refer to Figure 1 and Figure 3 One end of the second balance tube 720 is connected to the buffer container 400, and the other end is connected to the liquid inlet of the second switch valve 920.

[0068] The second balancing pipe 720 is connected to the inlet of the second switching valve 920, which controls the opening and closing of the balancing gas path between the gas-liquid separator 200 and the buffer container 400. By using a single second switching valve 920, the second balancing pipe 720 and the second drain pipe 820 can be controlled simultaneously, reducing the number of second switching valves 920 required. The second switching valve 920 can be configured with two outlets: one outlet connected to the buffer container 400 via the second balancing pipe 720, and the other outlet connected to the buffer container 400 via the second drain pipe 820; alternatively, the second switching valve 920 can be configured with one outlet, connected to the buffer container 400 via the second drain pipe 820, with the second balancing pipe 720 connected to the second drain pipe 820.

[0069] In other embodiments, a switching valve may also be provided on the second balance pipe 720 to independently control the on / off state of the second balance pipe 720.

[0070] In one implementation, please refer to Figure 1 and Figure 3 The second switching valve 920 is located near the gas-liquid separator 200.

[0071] The second switch valve 920 is located near the gas-liquid separator 200. The pressure at the end of the second balance pipe 720 near the gas-liquid separator 200 is closer to the pressure inside the gas-liquid separator 200. As a result, the pressure inside the buffer container 400 is closer to the pressure inside the gas-liquid separator 200, and they are relatively more balanced. Consequently, the drainage process of the buffer container 400 is smoother.

[0072] In other embodiments, the second switching valve 920 may also be located near the middle of the second balancing pipe 720 or near the buffer container 400.

[0073] In one implementation, please refer to Figure 5 The water electrolysis hydrogen production system 10 also includes a liquid level sensor 600, which is located in the gas-water separator 300 and can obtain the liquid level in the gas-water separator 300.

[0074] The liquid level sensor 600 can acquire the liquid level in the gas-liquid separator 300, and play an alarm and interlock role to ensure the safety and reliability of the liquid discharge process of the water electrolysis hydrogen production system 10. At the same time, by monitoring the liquid level in real time, potential problems can be detected in advance, system failures can be prevented, and the reliability and safety of the water electrolysis hydrogen production system 10 can be improved.

[0075] In one implementation, please refer to Figure 3 and Figure 4 The switching valve includes a first switching valve 910 and a second switching valve 920. The first switching valve 910 is located between the gas-liquid separator 300 and the buffer container 400, and the second switching valve 920 is located between the buffer container 400 and the gas-liquid separator 200. At least one of the first switching valve 910 and the second switching valve 920 is electrically connected to the liquid level sensor 600.

[0076] The liquid level sensor 600 acquires liquid level information within the gas-liquid separator 300, which can be used in an automatic control system to automatically control the opening and closing of the first switching valve 910 and / or the second switching valve 920 based on changes in the liquid level within the gas-liquid separator 300, thereby achieving intelligent management and reducing manual intervention.

[0077] Please see Figure 3 In the embodiment where the buffer container 400 and the scrubber 500 are set independently, when the liquid level in the gas-liquid separator 300 reaches the upper limit, the water electrolysis hydrogen production system 10 starts to drain the liquid from the gas-liquid separator 300 based on the liquid level information obtained by the liquid level sensor 600. At this time, the first switch valve 910 is opened and the second switch valve 920 is closed, so that the liquid phase in the gas-liquid separator 300 is discharged into the buffer container 400; when the liquid level in the gas-liquid separator 300 reaches the lower limit, the second switch valve 920 is opened and the first switch valve 910 is closed. After a certain period of time, the liquid phase inside the buffer container 400 flows into the gas-liquid separator 200 through the second drain pipe 820. The specific time for the buffer container 400 to discharge can be selected according to the actual situation.

[0078] Please see Figure 4In the embodiment where the buffer container 400 is configured as the housing of the scrubber 500, when the liquid level in the gas-liquid separator 300 reaches the upper limit, the water electrolysis hydrogen production system 10 begins to drain liquid from the gas-liquid separator 300 based on the liquid level information obtained by the liquid level sensor 600. At this time, the first switch valve 910 is opened, allowing the liquid phase in the gas-liquid separator 300 to be discharged into the scrubber 500; when the liquid level in the gas-liquid separator 300 reaches the lower limit, the first switch valve 910 is closed.

[0079] In other embodiments, the water electrolysis hydrogen production system 10 may also employ a timed liquid discharge scheme.

[0080] In the embodiment where the buffer container 400 and the scrubber 500 are set up independently, after the water electrolysis hydrogen production system 10 has been running for a certain period of time, the gas-liquid separator 300 begins to discharge liquid. The first switch valve 910 is opened and the second switch valve 920 is closed and maintained for a period of time. The liquid phase in the gas-liquid separator 300 flows into the buffer container 400. After a period of time, the second switch valve 920 is opened and the first switch valve 910 is closed. After a certain period of time, the liquid phase inside the buffer container 400 flows into the gas-liquid separator 200 through the second drain pipe 820. The specific discharge time is selected according to the actual situation.

[0081] Please see Figure 5 In the embodiment where the buffer container 400 is configured as the shell of the scrubber 500, after the water electrolysis hydrogen production system 10 has been running for a certain period of time, the gas-liquid separator 300 begins to discharge liquid, the first switch valve 910 is opened and maintained for a period of time, and the liquid phase in the gas-liquid separator 300 flows into the scrubber 500; after a period of time, the first switch valve 910 is closed, and the specific discharge time is selected according to the actual situation.

[0082] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A water electrolysis hydrogen production system, having a gas outlet, characterized in that, include: The electrolytic cell is connected to the gas outlet via an electrolysis product flow path; A gas-liquid separator and a gas-water separator are distributed sequentially from upstream to downstream along the electrolysis product flow path. The gas-water separator is also connected to the gas-liquid separator through a drainage flow path, and the drainage flow path is equipped with a switch valve. The buffer container, the gas-liquid separator, and the gas-water separator are distributed sequentially from top to bottom and along the upstream to downstream of the drainage path. At least one of the gas-liquid separator and the gas-liquid separator can be connected to the buffer container through a balance pipe to form a balanced gas path.

2. The water electrolysis hydrogen production system as described in claim 1, characterized in that, The balancing pipe includes a first balancing pipe, and the buffer container is connected to the gas-water separator through the first balancing pipe.

3. The water electrolysis hydrogen production system as described in claim 2, characterized in that, The buffer container is connected to the gas-liquid separator through a first drain pipe, and the switching valve includes a first switching valve, which is located on the first drain pipe.

4. The water electrolysis hydrogen production system as described in claim 3, characterized in that, One end of the first balance tube is connected to the gas-water separator, and the other end is connected to the liquid inlet of the first switching valve.

5. The water electrolysis hydrogen production system as described in claim 4, characterized in that, The first switching valve is positioned close to the buffer container.

6. The water electrolysis hydrogen production system according to any one of claims 1 to 5, characterized in that, The water electrolysis hydrogen production system also includes a scrubber, which is distributed between the gas-liquid separator and the gas-water separator in the electrolysis product flow path, and the buffer container is configured as the shell of the scrubber.

7. The water electrolysis hydrogen production system according to any one of claims 1 to 5, characterized in that, The water electrolysis hydrogen production system also includes a scrubber, which is distributed between the gas-liquid separator and the gas-water separator in the electrolysis product flow path, and the buffer container is set independently of the scrubber.

8. The water electrolysis hydrogen production system as described in claim 7, characterized in that, The balancing pipe includes a second balancing pipe, and the buffer container is connected to the gas-liquid separator through the second balancing pipe.

9. The water electrolysis hydrogen production system as described in claim 8, characterized in that, The buffer container is connected to the gas-liquid separator through a second drain pipe, and the switching valve includes a second switching valve, which is located on the second drain pipe.

10. The water electrolysis hydrogen production system as described in claim 9, characterized in that, One end of the second balance tube is connected to the buffer container, and the other end is connected to the inlet of the second switch valve.

11. The water electrolysis hydrogen production system as described in claim 10, characterized in that, The second switching valve is located near the gas-liquid separator.

12. The water electrolysis hydrogen production system according to any one of claims 1 to 5, 8 to 11, characterized in that, The water electrolysis hydrogen production system also includes a liquid level sensor, which is located in the gas-water separator and can obtain the liquid level in the gas-water separator.

13. The water electrolysis hydrogen production system as described in claim 12, characterized in that, The switching valve includes a first switching valve and a second switching valve. The first switching valve is located between the gas-liquid separator and the buffer container, and the second switching valve is located between the buffer container and the gas-liquid separator. At least one of the first switching valve and the second switching valve is electrically connected to the liquid level sensor.

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