Two-phase separation tank in hydrogen production system

Abstract

The invention discloses a double-phase separation tank in a hydrogen production system, which comprises an injection device, an inner cavity and a gas guide device, and is characterized in that the injection device is used for injecting an electrolyte into a stirring separation area of the inner cavity according to a specified direction, so that a gas-liquid mixture in the stirring separation area is turned over, and the precipitation of hydrogen bubbles in the gas-liquid mixture is accelerated; the inner cavity comprises a stirring separation area, a foam area, a precipitation separation area and a gasification area, the stirring separation area is used for controlling a gas-liquid mixture to flow into the precipitation separation area according to a preset path, so that hydrogen and hydrogen bubbles are separated from the gas-liquid mixture, and the foam area is used for promoting hydrogen bubble breakage to obtain hydrogen and target liquid; the stirring separation area is used for stirring a target liquid and a gas-liquid mixture, the precipitation separation area is used for standing electrolyte formed by the target liquid and the gas-liquid mixture so that residual hydrogen in the electrolyte can be separated out, the gasification area is used for storing hydrogen from the stirring separation area, the foam area and the precipitation separation area, and the gas guiding device is used for guiding the hydrogen in the gasification area out of the double-phase separation tank.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen production, and in particular to a two-phase separation tank in a hydrogen production system. Background Art

[0002] In the electrolytic hydrogen production system, the hydrogen separator plays a vital role. It is responsible for effectively separating the hydrogen produced during the electrolysis process from the electrolyte to ensure the purity of the hydrogen and the efficiency of subsequent utilization. The hydrogen separator is usually located downstream of the electrolyzer and receives a mixture of hydrogen and electrolyte from the electrolyzer. In the electrolyzer, water molecules are decomposed into hydrogen and oxygen under the action of direct current. These two gases flow out of the electrolyzer together with the electrolyte and enter the hydrogen separator. Inside the hydrogen separator, the mixture first passes through a series of carefully designed channels or structures, which use gravity and fluid dynamics to naturally separate the gas and liquid during the flow process. Specifically, because the density of hydrogen is much smaller than that of the electrolyte, under the action of gravity, hydrogen will float upward and gather at the top of the separator, while the electrolyte sinks to the bottom of the separator due to gravity. In addition, in order to further improve the separation efficiency, the hydrogen separator may also be equipped with special washing and cooling devices. These devices use clean water or coolant to wash and cool the rising hydrogen by spraying or immersion to remove electrolyte particles and heat that may be carried in it. The washed hydrogen becomes purer and the temperature is effectively controlled, providing better conditions for subsequent processing and utilization. The washed and cooled hydrogen is finally collected through the outlet pipe at the top of the separator and transported to hydrogen storage equipment or directly used in various industrial applications. The electrolyte at the bottom of the separator is returned to the electrolyzer through a circulation pump to achieve the recycling of the electrolyte.

[0003] In the existing hydrogen production system, the traditional separation device is a static separation device, which occupies a large area and has low separation efficiency. It can only rely on gravity to separate gas and liquid. The separation effect depends on the length of the static time and the temperature and pressure environment. Therefore, a more efficient separation device is needed to solve the above problems. Summary of the invention

[0004] The present application provides a two-phase separation tank in a hydrogen production system, aiming to improve the hydrogen separation efficiency of the hydrogen production system.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A two-phase separation tank in a hydrogen production system, comprising an ejector device (1), an inner cavity (2), and a gas guide device (3);

[0007] The ejection device (1) is used to eject the electrolyte into the stirring and separation zone (6) of the inner cavity (2) in a specified direction, so that the gas-liquid mixture in the stirring and separation zone (6) tumbles, thereby accelerating the precipitation of hydrogen bubbles in the gas-liquid mixture; the gas-liquid mixture includes the electrolyte and the hydrogen bubbles;

[0008] The inner cavity (2) comprises the stirring and separation zone (6), the foam zone (7), the precipitation and separation zone (8) and the gasification zone (9); the stirring and separation zone (6) is used to control the gas-liquid mixture to flow into the precipitation and separation zone (8) according to a preset path, so that hydrogen and the hydrogen bubbles are separated from the gas-liquid mixture; the foam zone (7) is used to promote the rupture of the hydrogen bubbles to obtain corresponding hydrogen and target liquid; the precipitation and separation zone (8) is used to allow the target liquid and the gas-liquid mixture to stand still, so that residual hydrogen in the target liquid and the gas-liquid mixture is separated; the gasification zone (9) is used to store hydrogen from the stirring and separation zone (6), the foam zone (7) and the precipitation and separation zone (8);

[0009] The gas guide device (3) is used to guide the hydrogen in the gasification zone (9) out of the two-phase separation tank.

[0010] Optionally, the two-phase separation tank is placed horizontally, the stirring separation zone (6) and the sedimentation separation zone (8) are located in the lower area of ​​the inner cavity (2), the foam zone (7) and the gasification zone (9) are located in the upper area of ​​the inner cavity (2), and the foam zone (7) is located above the stirring separation zone (6), and the gasification zone (9) is located above the sedimentation separation zone (8).

[0011] Optionally, the ejector device (1) comprises an ejector tube (4), the ejector tube (4) being located in the stirring and separation zone (6), and the ejector tube (4) being pre-set with a plurality of ejector holes (5), the ejection directions of the plurality of ejector holes (5) all facing the stirring and separation zone (6), the ejector holes (5) being used to eject the electrolyte in the ejector tube (4) in the specified direction, so that the electrolyte enters the stirring and separation zone (6) from the ejector tube (4) in the form of foam.

[0012] Optionally, the gas guiding device (3) comprises a gas collecting screen (14), an outlet pipe (15) and a reflux pipe (16), wherein the gas collecting screen (14) is located in the gasification zone (9), the gas collecting screen (14) is used to collect hydrogen in the gasification zone (9), the outlet pipe (15) is used to guide the hydrogen collected by the gas collecting screen (14) out of the two-phase separation tank, and the reflux pipe (16) is used to guide the moisture in the gas collecting screen (14) to the sedimentation separation zone (8).

[0013] Optionally, the outlet pipe (15) comprises a defoamer (17), and the defoamer (17) is used to intercept moisture carried in the hydrogen, so that the intercepted moisture flows back into the gas collecting screen (14).

[0014] Optionally, the gas collecting screen (14) comprises a plurality of gas collecting holes (18), and the plurality of gas collecting holes (18) are all facing upward and located in the top area of ​​the gasification zone (9), so that the gas collecting screen (14) collects hydrogen in the top area.

[0015] Optionally, the foam zone (7) comprises a shielding plate (10), wherein the shielding plate (10) is used to shield hydrogen bubbles flowing from the foam zone (7) to the gasification zone (9), and to promote the rupture of hydrogen bubbles in the foam zone (7), so that the target liquid obtained after the rupture of the hydrogen bubbles flows into the precipitation separation zone (8).

[0016] Optionally, the stirring and separation zone (6) comprises a cofferdam (11), wherein the cofferdam (11) is used to guide the gas-liquid mixture to flow into the sedimentation and separation zone (8) along a preset path and promote the collapse of hydrogen bubbles in the stirring and separation zone (6).

[0017] Optionally, the stirring and separation zone (6) further comprises a drain port (12), and when a switch of the drain port (12) is turned on, the liquid in the stirring and separation zone (6) flows out of the two-phase separation tank through the drain port (12).

[0018] Optionally, the sedimentation and separation zone (8) further comprises a drain port (13), and when the switch of the drain port (13) is turned on, the liquid in the sedimentation and separation zone (8) flows from the drain port (13) back to the electrolyzer of the hydrogen production system.

[0019] The technical solution provided by the present application includes an ejection device, an inner cavity and a gas guide device. The ejection device is used to eject the electrolyte into the stirring and separation zone of the inner cavity in a specified direction, so that the gas-liquid mixture in the stirring and separation zone rolls and accelerates the precipitation of hydrogen bubbles in the gas-liquid mixture. The inner cavity includes a stirring and separation zone, a foam zone, a precipitation separation zone and a gasification zone. The stirring and separation zone is used to control the gas-liquid mixture to flow into the precipitation separation zone along a preset path so that hydrogen and hydrogen bubbles are separated from the gas-liquid mixture. The foam zone is used to promote the rupture of hydrogen bubbles to obtain hydrogen and a target liquid. The precipitation separation zone is used to allow the electrolyte composed of the target liquid and the gas-liquid mixture to stand still so that the residual hydrogen in the electrolyte is separated. The gasification zone is used to store hydrogen from the stirring and separation zone, the foam zone and the precipitation separation zone. The gas guide device is used to lead the hydrogen in the gasification zone out of the two-phase separation tank. The present application makes full use of stirring precipitation and gravity precipitation to effectively separate gas (i.e., hydrogen) and liquid (i.e., electrolyte), thereby solving the problems of large footprint, single separation means, and low separation efficiency of traditional separation devices, and improving the hydrogen separation efficiency of the hydrogen production system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the architecture of a two-phase separation tank in a hydrogen production system provided in an embodiment of the present application;

[0022] Figure 2 A schematic diagram of the architecture of a hydrogen production system provided in an embodiment of the present application;

[0023] Figure 3 A schematic diagram of an improved structure of a two-phase separation tank provided in an embodiment of the present application;

[0024] Among them, the two-phase separation tank includes an ejector device 1, an inner cavity 2, a gas guide device 3, an ejector pipe 4, an ejector hole 5, a stirring separation zone 6, a foam zone 7, a sedimentation separation zone 8, a gasification zone 9, a baffle 10, a cofferdam 11, a sewage outlet 12, a liquid outlet 13, a gas collecting screen 14, an outlet pipe 15, a reflux pipe 16, a defoamer 17, a gas collecting hole 18, and a liquid level sensor 19. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] In this application, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "comprise one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0027] like Figure 1 As shown, it is a schematic diagram of the architecture of a two-phase separation tank in a hydrogen production system provided in an embodiment of the present application, which includes the following components.

[0028] An ejection device 1, an inner cavity 2 and a gas guide device 3.

[0029] Among them, the ejection device 1 is used to eject the electrolyte into the stirring and separation zone 6 of the inner cavity 2 in a specified direction, so that the gas-liquid mixture in the stirring and separation zone 6 rolls, accelerating the precipitation of hydrogen bubbles in the gas-liquid mixture, and the gas-liquid mixture includes electrolyte and hydrogen bubbles.

[0030] It should be noted that the ejection device 1 ejects the electrolyte into the stirring and separation zone 6 of the inner cavity 2 in a specified direction, so that the gas-liquid mixture in the stirring and separation zone 6 rolls, and the gas-liquid mixture in the stirring and separation zone 6 may appear to be boiling. The rolling of the gas-liquid mixture can be regarded as the gas-liquid mixture being in a state of violent motion, which can accelerate the precipitation and rupture of hydrogen bubbles in the gas-liquid mixture, so that hydrogen can be separated from the gas-liquid mixture faster, and the separation efficiency of hydrogen can be effectively improved.

[0031] In some examples, the types of hydrogen bubbles include bubbles and foams, and when the hydrogen bubbles burst, hydrogen gas and a target liquid are generated, and the target liquid includes an electrolyte and / or water. In a possible implementation, the type of the electrolyte may be an alkaline solution.

[0032] Optionally, the ejector device 1 includes an ejector tube 4, which is located in the stirring and separation zone 6, and a plurality of ejector holes 5 are preset on the ejector tube 4, and the ejection directions of the plurality of ejector holes 5 are all facing the stirring and separation zone 6. The ejection holes 5 are used to eject the electrolyte in the ejector tube 4 in a specified direction, so that the electrolyte enters the stirring and separation zone 6 from the ejector tube 4 in a foamy form.

[0033] It can be understood that the electrolyte is allowed to enter the stirring and separation zone 6 through the ejector device 1 first, because the electrolyte enters the inner cavity 2 from the ejector tube 4 in a foamy state, which is a sudden release process. The foam entrained with hydrogen will be ejected to the stirring and separation zone 6 in a specified direction by the ejector hole 5 on the ejector tube 4, causing the gas-liquid mixture in the stirring and separation zone 6 to roll and boil, thereby accelerating the precipitation and rupture of hydrogen bubbles, so that the hydrogen can be more fully separated from the gas-liquid mixture.

[0034] The inner cavity 2 includes a stirring and separation zone 6, a foam zone 7, a precipitation and separation zone 8, and a vaporization zone 9. The stirring and separation zone 6 is used to control the gas-liquid mixture to flow into the precipitation and separation zone 8 according to a preset path, so that hydrogen and hydrogen bubbles are separated from the gas-liquid mixture. The foam zone 7 is used to promote the rupture of hydrogen bubbles to obtain corresponding hydrogen and target liquid. The precipitation and separation zone 8 is used to allow the target liquid and the gas-liquid mixture to stand still, so that the residual hydrogen in the target liquid and the gas-liquid mixture is separated. The vaporization zone 9 is used to store hydrogen from the stirring and separation zone 6, the foam zone 7, and the precipitation and separation zone 8.

[0035] Optionally, the two-phase separation tank is placed horizontally, the stirring separation zone 6 and the sedimentation separation zone 8 are located in the lower area of ​​the inner cavity 2, the foam zone 7 and the gasification zone 9 are located in the upper area of ​​the inner cavity 2, and the foam zone 7 is located above the stirring separation zone 6, and the gasification zone 9 is located above the sedimentation separation zone 8.

[0036] It can be understood that, since the electrolyte and the gas-liquid mixture are liquids, and the hydrogen and hydrogen bubbles are gases, when the hydrogen and hydrogen bubbles are separated from the gas-liquid mixture in the stirring and separation zone 6, they will flow to the upper area of ​​the stirring and separation zone 6, and for this reason, the foam zone 7 is set above the stirring and separation zone 6. Similarly, when the hydrogen is separated from the target liquid in the precipitation and separation zone 8, it will flow to the upper area of ​​the precipitation and separation zone 8, and for this reason, the vaporization zone 9 is set above the precipitation and separation zone 8.

[0037] Optionally, the foam zone 7 includes a shielding plate 10, which is used to shield hydrogen bubbles flowing from the foam zone 7 to the gasification zone 9 and promote the rupture of hydrogen bubbles in the foam zone 7, so that the target liquid obtained after the rupture of the hydrogen bubbles flows into the precipitation separation zone 8.

[0038] It can be understood that the hydrogen bubbles and hydrogen gas generated in the stirring and separation zone 6 flow into the foam zone 7. The foam zone 7 is adjacent to the gasification zone 9. In order to prevent the hydrogen bubbles from flowing into the gasification zone 9, a baffle plate 10 is arranged between the foam zone 7 and the gasification zone 9. When the hydrogen bubbles touch the baffle plate 10, the hydrogen bubbles are physically collided and burst to produce corresponding hydrogen gas and target liquid. The hydrogen gas will flow to the gasification zone 9, and the target liquid will flow into the sedimentation and separation zone 8 under the influence of gravity, thereby realizing the isolation between the hydrogen bubbles and the hydrogen gas.

[0039] Optionally, the stirring and separation zone 6 includes a cofferdam 11 , which is used to guide the gas-liquid mixture to flow into the sedimentation and separation zone 8 along a preset path and promote the rupture of hydrogen bubbles in the stirring and separation zone 6 .

[0040] It can be understood that a preset path can be formed based on the layout of the cofferdam 11. When the gas-liquid mixture flows into the sedimentation separation zone 8 according to the preset path, the gas-liquid mixture is in a flowing state, thereby accelerating the separation efficiency of hydrogen and hydrogen bubbles from the gas-liquid mixture, and also accelerating the efficiency of hydrogen bubble rupture.

[0041] In a possible implementation, the layout of the cofferdam 11 can be a vortex, so that the gas-liquid mixture flowing in the preset path exhibits a stirring and separation effect. The so-called stirring and separation can be understood as stirring the gas-liquid mixture to improve the separation efficiency of hydrogen and hydrogen bubbles.

[0042] Optionally, the stirring and separation zone 6 further includes a drain port 12 . When the switch of the drain port 12 is turned on, the liquid in the stirring and separation zone 6 flows out of the two-phase separation tank from the drain port 12 .

[0043] In some examples, the shape, size and installation position of the sewage outlet 12 can be set by technicians according to actual conditions.

[0044] It is understandable that when the hydrogen production system completes the hydrogen production task, the switch of the drain port 12 can be opened to allow the liquid in the stirring and separation zone 6 to flow out of the two-phase separation tank from the drain port 12, ensuring that there is no impurity influence in the stirring and separation zone 6 when the next hydrogen production task is performed.

[0045] It should be noted that the hydrogen bubbles in the stirring and separation zone 6 flow into the foam zone 7, and the hydrogen generated by the bursting of the hydrogen bubbles flows into the vaporization zone 9 through physical collision with the baffle plate 10 in the foam zone 7, and the target liquid generated by the bursting of the hydrogen bubbles flows into the precipitation and separation zone 8, so that the precipitation and separation zone 8 stores a solution composed of the target liquid and a gas-liquid mixture. The solution (which can be regarded as an electrolyte) is subjected to secondary separation in the precipitation and separation zone 8, and the residual hydrogen in the solution is separated by standing.

[0046] Optionally, the sedimentation and separation zone 8 further includes a drain port 13. When the switch of the drain port 13 is turned on, the liquid in the sedimentation and separation zone 8 flows back from the drain port 13 to the electrolyzer of the hydrogen production system.

[0047] In some examples, the architecture of a hydrogen production system (e.g., an electrolysis hydrogen production system) can be found in Figure 2 As shown, the hydrogen separator (equivalent to the two-phase separation tank shown in this application) is an indispensable part of the electrolytic hydrogen production system. Its main function is to effectively separate the hydrogen and oxygen produced after electrolysis. The hydrogen separator separates the gas from the electrolyte through a series of processes to ensure the purity and quality of the hydrogen. Specifically, when the switch of the drain port 13 is turned on, the liquid in the sedimentation separation zone 8 flows back from the drain port 13 to the circulation pump of the hydrogen production system, and the circulation pump will then merge the liquid in the oxygen separator and the liquid in the sedimentation separation zone 8 to the electrolyzer to achieve the recycling of the electrolyte.

[0048] The gas guide device 3 is used to guide the hydrogen in the gasification zone 9 out of the two-phase separation tank.

[0049] Optionally, the gas guiding device 3 includes a gas collecting screen 14, an outlet pipe 15 and a reflux pipe 16. The gas collecting screen 14 is located in the gasification zone 9. The gas collecting screen 14 is used to collect hydrogen in the gasification zone 9. The outlet pipe 15 is used to lead the hydrogen collected by the gas collecting screen 14 out of the two-phase separation tank. The reflux pipe 16 is used to drain the moisture in the gas collecting screen 14 to the sedimentation separation zone 8.

[0050] Optionally, the outlet pipe 15 includes a defoamer 17 , and the defoamer 17 is used to intercept moisture carried in the hydrogen so that the intercepted moisture flows back into the gas collecting screen 14 .

[0051] In some examples, the type of the defoamer 17 includes but is not limited to a dehydration screen. Generally speaking, when the outlet pipe 15 leads the hydrogen carrying water out of the two-phase separation tank, the built-in dehydration screen can be used to intercept the water, so that the intercepted water is stored in the gas collecting screen 14 and flows into the precipitation separation zone 8 through the reflux pipe 16.

[0052] It can be understood that the defoaming effect provided by the defoamer 17 can ensure that the outlet pipe 15 can lead pure and dry hydrogen to the outside.

[0053] Obviously, the two-phase separation tank optimizes the overall structure of the hydrogen separator, improves the separation efficiency, maximizes the use of the physical properties of gas-liquid, utilizes the stirring effect of the stirring separation zone 6 to precipitate hydrogen, and then through the joint action of the baffle plate 10 and the cofferdam 11, most of the hydrogen bubbles are squeezed out to separate the hydrogen from the electrolyte, and the excess water carried in the hydrogen will be completely discharged through the defoamer 17 on the outlet pipe 15, and the collected water droplets will flow back to the precipitation separation zone 8 through the reflux pipe 16, so that the electrolyte can be recycled.

[0054] Optionally, the gas collecting screen 14 includes a plurality of gas collecting holes 18, and the plurality of gas collecting holes 18 are all facing upward and located in the top area of ​​the gasification zone 9, so that the gas collecting screen 14 collects hydrogen in the top area.

[0055] It is understandable that hydrogen and hydrogen bubbles may exist in the gasification zone 9 at the same time, and the mass of hydrogen bubbles is heavier than the weight of hydrogen. Therefore, hydrogen is in the top area of ​​the gasification zone 9, and hydrogen bubbles may gather in other areas below the top area. Since the gas collecting holes 18 of the gas collecting screen 14 face upward and are located in the top area of ​​the gasification zone 9, only the hydrogen in the top area can be sucked into the gas collecting holes 18, and the slightly heavier hydrogen bubbles will settle to the precipitation separation zone 8 located below the gasification zone 9.

[0056] Optional, see Figure 3 In the improved architecture shown, the two-phase separation tank also includes a liquid level sensor 19, which is used to monitor the liquid level of the gas-liquid mixture in the stirring and separation zone 6. When the liquid level meets a preset threshold, the ejection device 1 stops ejecting electrolyte into the stirring and separation zone 6.

[0057] It can be understood that, by utilizing the liquid level monitoring provided by the liquid level sensor 19, the automatic injection of the ejector device 1 can be achieved, ensuring that the volume of the gas-liquid mixture in the stirring and separation zone 6 is maintained within the calibrated range.

[0058] Based on the architecture of the two-phase separation tank shown above, the problems of large floor space, single separation means and low separation efficiency of traditional separation devices are solved. The two-phase separation tank changes the traditional static separation into stirring separation + static separation, making full use of the stirring precipitation and gravity precipitation effects, effectively separating the gas (i.e. hydrogen) and the liquid (i.e. electrolyte). The cofferdam and baffle are added to allow the stirred electrolyte to flow into the precipitation separation area along the preset path for static standing, and further separate the residual hydrogen in the electrolyte. In addition, the separation efficiency is greatly increased under the same volume, and the two separation methods of stirring and static standing are comprehensively utilized, so that the hydrogen in the electrolyte is fully separated on the preset path. The two-phase separation tank does not rely on electronic equipment to provide monitoring, and only needs to set up a liquid level sensor, which is more efficient than traditional separation devices.

[0059] Although several specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present application. Certain features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination.

[0060] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other to form a technical solution.

Claims

1. A two-phase separation tank in a hydrogen production system, characterized in that: It comprises an ejection device (1), an inner cavity (2) and a gas guide device (3); The ejection device (1) is used to eject the electrolyte into the stirring and separation zone (6) of the inner cavity (2) in a specified direction, so that the gas-liquid mixture in the stirring and separation zone (6) tumbles, thereby accelerating the precipitation of hydrogen bubbles in the gas-liquid mixture; the gas-liquid mixture includes the electrolyte and the hydrogen bubbles; The inner cavity (2) comprises the stirring and separation zone (6), the foam zone (7), the precipitation and separation zone (8) and the gasification zone (9); the stirring and separation zone (6) is used to control the gas-liquid mixture to flow into the precipitation and separation zone (8) according to a preset path, so that hydrogen and the hydrogen bubbles are separated from the gas-liquid mixture; the foam zone (7) is used to promote the rupture of the hydrogen bubbles to obtain corresponding hydrogen and target liquid; the precipitation and separation zone (8) is used to allow the target liquid and the gas-liquid mixture to stand still, so that residual hydrogen in the target liquid and the gas-liquid mixture is separated; the gasification zone (9) is used to store hydrogen from the stirring and separation zone (6), the foam zone (7) and the precipitation and separation zone (8); The gas guide device (3) is used to guide the hydrogen in the gasification zone (9) out of the two-phase separation tank.

2. The two-phase separation tank according to claim 1, characterized in that: The two-phase separation tank is placed horizontally, the stirring separation zone (6) and the sedimentation separation zone (8) are located in the lower area of ​​the inner cavity (2), the foam zone (7) and the gasification zone (9) are located in the upper area of ​​the inner cavity (2), and the foam zone (7) is located above the stirring separation zone (6), and the gasification zone (9) is located above the sedimentation separation zone (8).

3. The two-phase separation tank according to claim 1, characterized in that: The ejector device (1) comprises an ejector tube (4), the ejector tube (4) being located in the stirring and separation zone (6), and the ejector tube (4) being pre-set with a plurality of ejector holes (5), the ejection directions of the plurality of ejector holes (5) all facing the stirring and separation zone (6), the ejector holes (5) being used to eject the electrolyte in the ejector tube (4) in the specified direction, so that the electrolyte enters the stirring and separation zone (6) from the ejector tube (4) in the form of foam.

4. The two-phase separation tank according to claim 1, characterized in that: The gas guide device (3) comprises a gas collecting screen (14), an outlet pipe (15) and a reflux pipe (16); the gas collecting screen (14) is located in the gasification zone (9); the gas collecting screen (14) is used to collect hydrogen in the gasification zone (9); the outlet pipe (15) is used to guide the hydrogen collected by the gas collecting screen (14) out of the two-phase separation tank; and the reflux pipe (16) is used to guide the moisture in the gas collecting screen (14) to the sedimentation separation zone (8).

5. The two-phase separation tank according to claim 4, characterized in that: The outlet pipe (15) comprises a defoamer (17), and the defoamer (17) is used to intercept moisture carried in the hydrogen, so that the intercepted moisture flows back into the gas collecting screen (14).

6. The two-phase separation tank according to claim 4, characterized in that: The gas collecting screen (14) comprises a plurality of gas collecting holes (18), and the plurality of gas collecting holes (18) are all directed upward and located in the top area of ​​the gasification zone (9), so that the gas collecting screen (14) collects hydrogen in the top area.

7. The two-phase separation tank according to claim 1, characterized in that: The foam zone (7) comprises a shielding plate (10), wherein the shielding plate (10) is used to shield hydrogen bubbles flowing from the foam zone (7) to the gasification zone (9), and to promote the rupture of hydrogen bubbles in the foam zone (7), so that target liquid obtained after the rupture of the hydrogen bubbles flows into the precipitation separation zone (8).

8. The two-phase separation tank according to claim 1, characterized in that: The stirring and separation zone (6) comprises a cofferdam (11), wherein the cofferdam (11) is used to guide the gas-liquid mixture to flow into the sedimentation and separation zone (8) along a preset path and to promote the collapse of hydrogen bubbles in the stirring and separation zone (6).

9. The two-phase separation tank according to claim 1, characterized in that: The stirring and separation zone (6) further comprises a sewage outlet (12). When the switch of the sewage outlet (12) is turned on, the liquid in the stirring and separation zone (6) flows out of the two-phase separation tank through the sewage outlet (12).

10. The two-phase separation tank according to claim 1, characterized in that: The precipitation and separation zone (8) further comprises a liquid discharge port (13). When the switch of the liquid discharge port (13) is turned on, the liquid in the precipitation and separation zone (8) flows back from the liquid discharge port (13) to the electrolyzer of the hydrogen production system.

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