Hydrogen separation tank and water electrolysis hydrogen production system

Abstract

The hydrogen separation tank comprises a standing space, a gasification space, a water washing space, a cooling space and a dehydration gas collection space, the standing space is provided with an electrolyte inlet, an electrolyte outlet and a flow guide plate, the electrolyte inlet is formed in the tangential direction of the standing space, and the flow guide plate is arranged in the gasification space. The electrolyte outlet is arranged at the bottom of the standing space, so that the electrolyte forms rotational flow in the standing space; a collecting disc is arranged between the standing space and the gasification space, and air outlet holes are formed in the collecting disc; the washing space is communicated with the gasification space through a backwashing spray pipe; the cooling space is provided with at least one group of cooling coils, the first ends of the cooling coils are communicated with the washing space, the second ends of the cooling coils are communicated with the dehydration gas collection space, and the cooling space is provided with a cooling medium inlet and a cooling medium outlet; and the dehydration gas collection space is provided with a defoaming dehydration screen mesh and a gas outlet. The hydrogen separation tank disclosed by the invention can improve the gas-liquid separation efficiency and accelerate the gas-liquid separation.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production from electrolyte, and more specifically, to a hydrogen separation tank and a water electrolysis hydrogen production system. Background Art

[0002] Hydrogen production by electrolysis is the process of decomposing water molecules into hydrogen and oxygen by electrolysis. When current passes through the electrolyzer, water molecules undergo redox reactions at the electrodes of the electrolyzer. At the anode, water molecules lose electrons and are oxidized into oxygen; at the cathode, water molecules gain electrons and are reduced into hydrogen. This process not only achieves energy conversion, but also converts water resources into a clean and efficient energy source - hydrogen energy.

[0003] The hydrogen separator is an indispensable part of the electrolytic water 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.

[0004] The hydrogen separator is usually located downstream of the electrolyzer and receives a mixture of hydrogen and electrolyte from the electrolyzer. The mixture first passes through a series of channels or structures that use gravity and fluid dynamics to naturally separate the gas and liquid during the flow. 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 will sink to the bottom of the separator due to gravity.

[0005] The existing hydrogen separator adopts a static separation method, relying on gravity to perform gas-liquid separation. The separation effect depends on the length of the static separation time and the temperature and pressure environment, and the separation efficiency is low.

[0006] Therefore, how to improve the separation efficiency and speed of hydrogen has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0007] In view of this, an object of the present invention is to provide a hydrogen separation tank to improve the separation efficiency of hydrogen and increase the hydrogen separation speed.

[0008] Another core of the present invention is to disclose a water electrolysis hydrogen production system including the above-mentioned hydrogen separation tank.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A hydrogen separation tank comprises a static space, a gasification space, a water washing space, a cooling space and a dehydration and gas collecting space;

[0011] The static space is provided with an electrolyte inlet, an electrolyte outlet and a guide plate, the electrolyte inlet is arranged in a tangential direction of the static space so that the electrolyte forms a vortex in the static space, and the electrolyte outlet is arranged at the bottom of the static space;

[0012] A collecting plate is provided between the static space and the gasification space, and an air outlet is provided on the collecting plate;

[0013] The water washing space is connected to the gasification space through a backwash nozzle, and a water washing section is arranged in the water washing space;

[0014] The cooling space is provided with at least one group of cooling coils, the first end of the cooling coils is connected to the water washing space, the second end of the cooling coils is connected to the dehydration and gas collecting space, and the cooling space is provided with a cooling medium inlet and a cooling medium outlet;

[0015] The dehydration and gas collection space is provided with a defoaming and dehydration screen and a gas outlet.

[0016] Optionally, in the above hydrogen separation tank, a guide plate is provided in the static space.

[0017] Optionally, in the above hydrogen separation tank, the collecting plate is in the shape of a table, and the small diameter end of the collecting plate faces the gasification space, and the gas outlet is arranged at the small diameter end of the collecting plate.

[0018] Optionally, in the above hydrogen separation tank, a gravity separation module is arranged on the collection plate, and the gravity separation module includes a plurality of gravity separation units arranged at intervals, and the gravity separation units correspond one-to-one to the gas outlets arranged on the collection plate and are connected to the gas outlets.

[0019] Optionally, in the above hydrogen separation tank, the gravity separation unit is fixedly connected or movably connected to the collecting plate.

[0020] Optionally, in the above hydrogen separation tank, a baffle is provided at the bottom of the gravity separation unit, and an air inlet hole is opened on the side wall of the gravity separation unit.

[0021] Optionally, in the above hydrogen separation tank, a partition is provided in the gravity separation unit, and the number of the partition is at least one. When the number of the partition is multiple, two adjacent partitions are staggered to form a gas channel.

[0022] Optionally, in the above hydrogen separation tank, a dehydration tray is provided in the water washing space, and the hydrogen is dehydrated through the dehydration tray after being washed with water in the water washing section.

[0023] Optionally, in the above hydrogen separation tank, the dehydration tray includes a plurality of blades, and any two adjacent blades are stacked to form a gas channel for hydrogen to pass through.

[0024] Optionally, in the above hydrogen separation tank, the static space is provided with a liquid level gauge, the water washing space is provided with a water supply pipe and an overflow pipe, one end of the overflow pipe is connected to the water washing space, and the other end is connected to the static space.

[0025] A water electrolysis hydrogen production system comprises the above-mentioned hydrogen separation tank.

[0026] It can be seen from the above scheme that in the hydrogen separation tank disclosed by the present invention, the hydrogen-containing electrolyte enters along the tangential direction of the static space, and the guide plate and the electrolyte inlet cooperate to make the hydrogen-containing electrolyte rotate in the static space. Under the action of centrifugal force, the electrolyte sinks to the bottom of the static space, and the bubbles in the hydrogen-containing electrolyte and the released hydrogen gather toward the top center of the static space. Compared with the static separation method in the prior art (gas-liquid separation is achieved only by gravity), the gas-liquid separation efficiency can be improved and the gas-liquid separation can be accelerated; the hydrogen separation tank disclosed in the embodiment of the present invention integrates the traditional water washing device, cooling device and hydrogen separation tank into one, with high integration, which can reduce the floor space, save space and reduce the difficulty of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 This is a schematic diagram of the structure of a hydrogen separation tank disclosed in an embodiment of the present invention;

[0029] Figure 2 A top view of a hydrogen separation tank disclosed in an embodiment of the present invention;

[0030] Figure 3 It is a schematic diagram of the structure of the water electrolysis hydrogen production system disclosed in an embodiment of the present invention.

[0031] Among them, 10, electrolyzer, 20, oxygen separation device, 30, circulation pump, 40, hydrogen separation tank, 50, cooler;

[0032] 100. static space, 110. electrolyte inlet, 120. electrolyte outlet, 130. collecting tray, 140. gravity separation module, 141. gravity separation unit, 150. liquid level meter;

[0033] 200, gasification space;

[0034] 300, water washing space, 310, water washing section, 320, backwashing nozzle, 330, dehydration tray, 340, water supply pipe, 350, overflow pipe;

[0035] 400, cooling space, 410, cooling coil, 420, cooling medium inlet, 430, cooling medium outlet;

[0036] 500, dehydration gas collecting space, 510, gas outlet. DETAILED DESCRIPTION

[0037] In addition to the problems mentioned in the background technology, the prior art also has the following problems: the hydrogen separator needs to be equipped with separate water washing and dehydration equipment to assist in completing the separation work, which occupies a large area and has low integration.

[0038] The core of the present invention is to disclose a hydrogen separation tank to improve the separation efficiency of hydrogen and increase the separation speed of hydrogen.

[0039] Another core of the present invention is to disclose a water electrolysis hydrogen production system including the above-mentioned hydrogen separation tank.

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] like Figure 1 As shown, the hydrogen separation tank disclosed in the embodiment of the present invention includes a static space 100, a vaporization space 200, a water washing space 300, a cooling space 400 and a dehydration and gas collecting space 500. The static space 100, the vaporization space 200, the water washing space 300, the cooling space 400 and the dehydration and gas collecting space 500 are arranged in the tank body in sequence and connected.

[0042] like Figure 3 As shown, the hydrogen separation tank 40 is located downstream of the electrolytic cell 10, and a mixture of hydrogen and electrolyte (hereinafter referred to as hydrogen-containing electrolyte for convenience of explanation) enters the hydrogen separation tank 40, where the electrolyte and hydrogen are separated into gas and liquid.

[0043] The static space 100 is provided with an electrolyte inlet 110, an electrolyte outlet 120 and a guide plate. Specifically, the electrolyte inlet 110 is arranged in the tangent direction of the static space 100. Figure 2As shown, a guide plate is provided in the static space 100, and the guide plate guides the flow of the hydrogen-containing electrolyte so that the hydrogen-containing electrolyte enters the static space 100 along the tangential direction. The guide plate and the electrolyte inlet 110 jointly guide the electrolyte to rotate naturally in the static space 100. The electrolyte outlet 120 is provided at the bottom of the static space 100. The electrolyte outlet 120 is connected to the inlet of the electrolytic cell 10, and the electrolyte from which the hydrogen is separated is transported back to the electrolytic cell 10 for recycling.

[0044] The guide plate is preferably spiral-shaped to provide a guiding effect on the flow of the hydrogen-containing electrolyte. The provision of the guide plate can increase the flow path of the mixture and reduce the flow rate, so that hydrogen bubbles can be separated from the electrolyte.

[0045] A collecting tray 130 is provided between the static space 100 and the gasification space 200. The collecting tray 130 is used to collect hydrogen released from the hydrogen-containing electrolyte. An outlet hole is provided on the collecting tray 130 to connect the static space 100 and the gasification space 200. The hydrogen enters the gasification space 200 through the outlet hole on the collecting tray 130.

[0046] The water washing space 300 is connected to the gasification space 200 through the backwash nozzle 320. A water washing section 310 is arranged in the water washing space 300, that is, the first end of the backwash nozzle 320 is connected to the gasification space 200, and the second end is connected to the water washing section 310. Pure water is contained in the water washing section 310. The backwash nozzle 320 may include a plurality of backwash nozzles 320 arranged at intervals along the circumferential direction. The hydrogen entering the gasification space 200 enters the water washing space 300 through the backwash nozzle 320 and is washed with pure water to remove the residual electrolyte in the hydrogen.

[0047] The cooling space 400 is provided with at least one group of cooling coils 410, the first end of the cooling coils 410 is connected to the water washing space 300, the second end of the cooling coils 410 is connected to the dehydration and gas collection space 500, and the cooling space 400 is provided with a cooling medium inlet 420 and a cooling medium outlet 430, and the cooling medium is preferably cooling water. The cooling coils 410 are preferably spiral coils. When the number of cooling coils 410 includes multiple groups, the multiple groups of cooling coils 410 can be wound in a concentric manner, and the winding radius is arranged in sequence from small to large, or a non-concentric winding manner can be used, and the winding radius can be the same or different. The dehydration and gas collection space 500 is provided with a defoaming and dehydration screen and a gas outlet 510.

[0048] It should be noted that the backwash nozzle 320 blows hydrogen into pure water through the pressure difference, so that the electrolyte carried by the hydrogen is dissolved in the pure water, thereby preventing the electrolyte from corroding the equipment in the subsequent process. The second end of the backwash nozzle 320 is preferably extended into the water washing section 310 by setting an elbow or a bend.

[0049] The hydrogen-containing electrolyte enters the static space 100 along the tangent direction through the electrolyte inlet 110. Since the hydrogen-containing electrolyte enters the static space 100 from the pipeline in the form of foam, the pressure is reduced, the bubbles burst, and the hydrogen inside is released. Under the joint ejection effect of the guide plate and the electrolyte inlet 110, the hydrogen-containing electrolyte rotates around the axis of the static space 100. Since the density of hydrogen is less than that of the electrolyte, the centrifugal forces generated by hydrogen and the electrolyte are different. The electrolyte with a larger density moves outward and descends along the wall of the static space 100. The bubbles with a smaller density and the released hydrogen are concentrated in the inner circle of the vortex, continue to move upward, and continuously gather toward the top center of the static space 100. Under the action of mutual compression of hydrogen bubbles, the bubbles will burst for a second time, thereby releasing the hydrogen inside. The remaining hydrogen that has not yet been precipitated from the electrolyte will gradually precipitate during the static state. Finally, the hydrogen released from the electrolyte gathers at the top center of the static space 100.

[0050] Then, the hydrogen at the top of the static space 100 enters the gasification space 200 through the air outlet on the collecting plate 130, and then the hydrogen enters the water washing section 310 in the water washing space 300 through the backwash nozzle 320. In the water washing section 310, it is rinsed with pure water to remove the residual electrolyte in the hydrogen. The hydrogen after water washing in the water washing space 300 enters the cooling coil 410, and is cooled by the cooling medium in the cooling space 400, so that the water vapor in the hydrogen condenses into water droplets, and the hydrogen is dried. The cooled hydrogen enters the dehydration gas collection space 500, and the defoaming and dehydration screen intercepts the water droplets carried in the hydrogen, and it is discharged from the gas outlet 510 after defoaming and dehydration. What flows out from the gas outlet 510 is pure and dry hydrogen, which is transported to hydrogen storage equipment or directly used in various industrial applications.

[0051] In the hydrogen separation tank disclosed in the embodiment of the present invention, the hydrogen-containing electrolyte enters along the tangential direction of the static space 100, and the guide plate and the electrolyte inlet 110 cooperate to make the hydrogen-containing electrolyte rotate in the static space 100. Under the action of centrifugal force, the electrolyte sinks to the bottom of the static space 100, and the bubbles in the hydrogen-containing electrolyte and the released hydrogen gather toward the top center of the static space 100. Compared with the static separation method in the prior art (gas-liquid separation is achieved only by gravity), the gas-liquid separation efficiency can be improved and the gas-liquid separation can be accelerated. The hydrogen separation tank disclosed in the embodiment of the present invention integrates the traditional water washing device, cooling device and hydrogen separation tank into one, with high integration, which can reduce the floor space, save space and reduce the difficulty of operation.

[0052] In some specific embodiments, the static space 100 may include a guide chamber and a collecting chamber, the electrolyte inlet 110 is arranged in the guide chamber, the electrolyte outlet 120 is arranged in the collecting chamber, the guide plate is arranged in the guide chamber, the guide chamber and the collecting chamber are separated by a partition, and a liquid outlet is arranged on the partition.

[0053] Furthermore, in order to enable the collecting plate 130 to better collect hydrogen and gather the hydrogen, the collecting plate 130 is shaped like a table, which can be a truncated cone or a prism, preferably a truncated cone. The small diameter end of the collecting plate 130 faces the vaporization space 200, and the air outlet is arranged at the small diameter end of the collecting plate 130, so that the center of the collecting plate 130 is higher than the two ends. The hydrogen gathers at the top center of the collecting plate 130 and enters the vaporization space 200 through the air outlet on the collecting plate 130.

[0054] Furthermore, a gravity separation module 140 is provided on the collection plate 130, and the gravity separation module 140 includes a plurality of gravity separation units 141 arranged at intervals, and the gravity separation units 141 correspond to the gas outlets one by one and are connected with the gas outlets to connect the static space 100 and the gasification space 200. Hydrogen enters the gravity separation unit 141, and the electrolyte carried by the hydrogen is preliminarily separated in the gravity separation unit 141.

[0055] Furthermore, the gravity separation unit 141 is fixedly connected or movably connected to the collection tray 130, preferably movably connected.

[0056] In some specific embodiments, each gravity separation unit 141 is provided with an air inlet, a baffle is provided at the bottom of the gravity separation unit 141, and the air inlet is provided on the side wall of the gravity separation unit 141. The air inlet may include a plurality of air inlets arranged along the circumference of the gravity separation unit 141. Hydrogen flows upward from the static space 100, is blocked by the baffle of the gravity separation unit 141, and flows toward the side wall, the air flow direction changes, and the residual electrolyte in the hydrogen falls along the collection plate 130 to the bottom of the static space 100, and flows out through the electrolyte outlet 120. The gravity separation unit 141 may be cylindrical or prismatic.

[0057] In other specific embodiments, a partition is provided in the gravity separation unit 141, an opening is provided at the bottom of the gravity separation unit 141, the number of the partitions includes at least one, and the partitions can be arranged in a spiral shape. When there are multiple partitions, two adjacent partitions are arranged in a staggered manner to form a gas channel for hydrogen flow. Under the action of the partition, the direction of the gas flow changes, and the residual electrolyte in the hydrogen falls to the bottom of the gravity separation unit 141 under the obstruction of the partition, falls into the static space 100 through the opening at the bottom of the gravity separation unit 141, and flows out through the electrolyte outlet 120.

[0058] Furthermore, in order to dry the hydrogen after washing in the washing space 300, a dehydration tray 330 is provided in the washing space 300, and the dehydration tray 330 is provided at the upper part of the washing section 310. The hydrogen enters the dehydration tray 330 after being washed with pure water, and enters the cooling space 400 for cooling after being dehydrated at the dehydration tray 330.

[0059] Specifically, in some specific embodiments, the dehydration tray 330 includes a plurality of blades, and two adjacent blades are stacked to form a flow channel for hydrogen to pass through, which refers to the partial stacking of two adjacent blades, so that the dehydration tray 330 is in the shape of a shutter as a whole. When hydrogen passes through the dehydration tray 330, the flow direction of hydrogen changes due to the partial stacking of two adjacent blades, and the residual electrolyte in the hydrogen is separated under the action of gravity and drips into the water washing section 310, thereby playing a role in dehydration.

[0060] Specifically, the blades may be zigzag, fan-shaped, trapezoidal, or rectangular. Several blades may be arranged concentrically, so that the dehydration tray 330 is circular as a whole; or several blades may be stacked coaxially, so that the dehydration tray 330 is cylindrical as a whole; or several blades may be stacked in parallel, so that the dehydration tray 330 is rectangular as a whole.

[0061] Further, in order to monitor the liquid level of the electrolyte in the static space 100, the static space 100 is provided with a liquid level meter 150, and the water washing space 300 is provided with a water supply pipe 340 and an overflow pipe 350. The water supply pipe 340 is connected to the water supply device, and one end of the overflow pipe 350 is connected to the water washing space 300, and the other end is connected to the static space 100. When the liquid level meter 150 detects that the liquid level in the static space 100 is lower than the preset liquid level, the water supply device is started, and water is supplied to the water washing space 300 through the water supply pipe 340. After the water in the water washing section 310 reaches the preset liquid level, when water supply continues, pure water flows into the static space 100 through the overflow pipe 350 until the liquid level in the static space 100 reaches the preset liquid level, and the water supply device stops supplying water. The liquid level meter 150 can be a magnetic flap liquid level meter, a float liquid level meter, or an ultrasonic liquid level meter, and the specific type is not specifically limited. The setting of the liquid level meter 150 and the overflow pipe 350 can maintain a constant liquid level of the electrolyte in the static space 100. Since the water electrolysis hydrogen production system produces hydrogen by decomposing water, the amount of water in the system is constantly being consumed. The pure water replenished through the overflow pipe 350 is also a source of replenishment for the water electrolysis hydrogen production system, which can ensure the stable operation of the water electrolysis hydrogen production system. At the same time, the setting of the liquid level meter 150 and the overflow pipe 350 is simple in structure and easy to use.

[0062] In addition, the present invention also discloses a water electrolysis hydrogen production system. Figure 3As shown, it specifically includes an electrolyzer 10, an oxygen separation device 20, a hydrogen separation tank 40, a circulation pump 30 and a cooler 50, wherein the oxygen separation device 20 is connected to the anode side of the electrolyzer 10, the hydrogen separation tank 40 is connected to the cathode side of the electrolyzer 10, the electrolyte outlet of the oxygen separation device 20 and the electrolyte outlet 120 of the hydrogen separation tank 40 are connected to the cooler 50, the cooler 50 is connected to the circulation pump 30, the circulation pump 30 is connected to the inlet of the electrolyzer 10, the circulation pump 30 provides power for the electrolyte to flow back to the electrolyzer 10, and the hydrogen separation tank 40 is the hydrogen separation tank disclosed in the above embodiment. It should be noted that in order to facilitate the distinction between the oxygen separation device 20 and the hydrogen separation tank 40, in Figure 2 The hydrogen separation tank 40 is numbered in the figure, but it is not numbered in the above text.

[0063] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0064] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0065] It should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present invention and simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the embodiments of the present invention.

[0066] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A hydrogen separation tank, characterized in that: It includes a static space (100), a gasification space (200), a water washing space (300), a cooling space (400) and a dehydration and gas collection space (500); The static space (100) is provided with an electrolyte inlet (110), an electrolyte outlet (120) and a guide plate; the electrolyte inlet (110) is arranged in a tangential direction of the static space (100) so that the electrolyte forms a vortex in the static space (100); and the electrolyte outlet (120) is arranged at the bottom of the static space (100); A collecting plate (130) is provided between the static space (100) and the gasification space (200), and an air outlet hole is provided on the collecting plate (130); The water washing space (300) is connected to the gasification space (200) via a backwash nozzle (320), and a water washing section (310) is provided in the water washing space (300); The cooling space (400) is provided with at least one group of cooling coils (410), a first end of the cooling coils (410) is connected to the water washing space (300), a second end of the cooling coils (410) is connected to the dehydration and gas collecting space (500), and the cooling space (400) is provided with a cooling medium inlet (420) and a cooling medium outlet (430); The dehydration and gas collection space (500) is provided with a defoaming and dehydration screen and a gas outlet (510).

2. The hydrogen separation tank according to claim 1, characterized in that: The shape of the collecting plate (130) is a table shape, and the small-diameter end of the collecting plate (130) faces the gasification space (200), and the gas outlet is arranged at the small-diameter end of the collecting plate (130).

3. The hydrogen separation tank according to claim 2, characterized in that: A gravity separation module (140) is arranged on the collection tray (130), and the gravity separation module (140) comprises a plurality of gravity separation units (141) arranged at intervals, and the gravity separation units (141) correspond one-to-one to the air outlet holes arranged on the collection tray (130) and are connected to the air outlet holes.

4. The hydrogen separation tank according to claim 3, characterized in that: The gravity separation unit (141) is fixedly connected or movably connected to the collection tray (130).

5. The hydrogen separation tank according to claim 4, characterized in that: A baffle is provided at the bottom of the gravity separation unit (141), and an air inlet hole is provided on the side wall of the gravity separation unit (141).

6. The hydrogen separation tank according to claim 5, characterized in that: A partition is provided in the gravity separation unit (141), and the number of the partition is at least one. When the number of the partition is plural, two adjacent partitions are staggered to form a gas channel.

7. The hydrogen separation tank according to claim 1, characterized in that: The water washing space (300) is provided with a dehydration tray (330), and the hydrogen is dehydrated through the dehydration tray (330) after being washed with water in the water washing section (310).

8. The hydrogen separation tank according to claim 7, characterized in that: The dehydration tray (330) comprises a plurality of blades, and any two adjacent blades are stacked to form a gas channel for hydrogen to pass through.

9. The hydrogen separation tank according to claim 1, characterized in that: The static space (100) is provided with a liquid level meter (150), and the water washing space (300) is provided with a water supply pipe (340) and an overflow pipe (350); one end of the overflow pipe (350) is connected to the water washing space (300), and the other end is connected to the static space (100).

10. A system for producing hydrogen by electrolysis of water, characterized in that: It comprises the hydrogen separation tank as described in any one of claims 1 to 9.

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