Gas-liquid separation device and hydrogen fuel system

Abstract

The invention discloses a gas-liquid separation device and a hydrogen fuel system, and belongs to the technical field of hydrogen fuel cells, the gas-liquid separation device comprises a separation shell, a separation core body, a liquid discharge shell and a distribution drainage mechanism, the separation shell is provided with a mixed liquid inlet, an exhaust port and a first liquid discharge port; the separation core body is arranged in the separation shell and is used for carrying out gas-liquid separation on the mixed fluid entering from the mixed liquid inlet; the liquid discharge shell is connected to the bottom of the separation shell and communicates with the separation shell through a first liquid discharge port, and the liquid discharge shell is provided with a second liquid discharge port; the step-by-step drainage mechanism comprises a plugging assembly arranged in the drainage shell, the plugging assembly can plug the first drainage opening and the second drainage opening, and the plugging assembly is configured to plug the second drainage opening when the first drainage opening is opened. According to the invention, back pressure loss of the anode during liquid discharge can be prevented, the pressure fluctuation amplitude of the anode is reduced, stable output of a galvanic pile is ensured, and thus stable work of a hydrogen fuel system is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen fuel cells, and in particular to a gas-liquid separation device and a hydrogen fuel system. Background Art

[0002] The hydrogen fuel system is developing towards high power. Hydrogen fuel cells are an important part of the hydrogen fuel system. High-power hydrogen fuel cells will produce a lot of water when working. Part of the generated water enters the anode through the PEM membrane. The anode of the hydrogen fuel cell is connected to a gas-water separator, which can separate liquid water through the gas-water separator, so that the remaining hydrogen from the reaction can flow back to the anode inlet through the ejector or hydrogen circulation pump. At the same time, the separated water needs to be discharged out of the system through the drain valve in the gas-water separator.

[0003] For low-power hydrogen fuel systems, less water is generated, and the caliber of the drain valve used is smaller. When the drain valve is opened, the anode pressure fluctuation of the hydrogen fuel system is small. However, for high-power hydrogen fuel systems, more water is generated, and the caliber of the required drain valve is larger, resulting in that when the hydrogen fuel system opens the drain valve to drain water, the anode gas of the hydrogen fuel system is directly connected to the external environment, which leads to a lack of anode back pressure and excessive anode pressure fluctuations, which causes drastic changes in the reaction environment of the fuel cell stack, affecting the stable output of the fuel cell stack.

[0004] Therefore, there is an urgent need for a gas-liquid separation device and a control method thereof, and a hydrogen fuel cell system to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a gas-liquid separation device and a hydrogen fuel system, which can prevent the anode from having a back pressure loss during liquid discharge, reduce the pressure fluctuation amplitude of the anode, ensure the stable output of the fuel cell stack, and further ensure the stable operation of the hydrogen fuel system.

[0006] As conceived above, the technical solution adopted by the present invention is:

[0007] A gas-liquid separation device, comprising:

[0008] A separation shell, wherein the separation shell has a mixed liquid inlet, an exhaust port and a first liquid discharge port;

[0009] A separation core body is disposed in the separation shell and is used to separate the mixed fluid entering from the mixed liquid inlet into gas and liquid;

[0010] A liquid discharge housing connected to the bottom of the separation housing and communicated with the separation housing through a first liquid discharge port, wherein the liquid discharge housing has a second liquid discharge port;

[0011] The step-by-step drainage mechanism comprises a blocking component arranged in the drainage housing, the blocking component can block the first drainage port and the second drainage port, and the blocking component is configured to block the second drainage port when the first drainage port is opened.

[0012] Optionally, the sealing assembly includes a first plug and a second plug, the first plug can seal the first drainage port, the second plug can seal the second drainage port, and the first plug and / or the second plug slide in the drainage housing.

[0013] Optionally, the step-by-step drainage mechanism further includes a connecting member and a driving member, the first plug and the second plug are connected via the connecting member, and an output end of the driving member is connected to the first plug and / or the second plug.

[0014] Optionally, the step-by-step drainage mechanism further includes two driving members, one of the two driving members is connected to the first plug, and the other is connected to the second plug.

[0015] Optionally, the separation core is rotatably disposed in the separation shell, and the separation core has a liquid drop hole, and the separated liquid falls into the liquid discharge shell through the liquid drop hole and the first liquid discharge port.

[0016] Optionally, the separation core includes a first separation cylinder and a chassis connected to the outer periphery of the first separation cylinder, the chassis is rotatably connected to the separation shell, the bottom of the chassis and the first separation cylinder are respectively provided with the liquid drop hole, the first separation cylinder is a top opening structure, and is spaced apart from the top of the separation shell.

[0017] Optionally, it also includes a second separation cylinder, one end of which is connected to the separation shell, and the other end is located in the first separation cylinder, a first separation chamber is formed between the first separation cylinder and the inner wall of the separation shell, a second separation chamber is formed between the second separation cylinder and the first separation cylinder, the second separation chamber is connected to the first separation chamber and the second separation cylinder, the second separation cylinder is connected to the exhaust port, and the first separation chamber is connected to the mixed liquid inlet.

[0018] Optionally, the mixed liquid inlet is arranged on the side wall of the separation shell and is arranged opposite to the side wall of the first separation cylinder, and the exhaust port is arranged on the top of the separation shell and is arranged opposite to the top of the first separation cylinder.

[0019] Optionally, the separation shell has a first guiding slope, and the first guiding slope is used to guide the liquid dropped from the liquid drop hole to the first liquid discharge port; and / or

[0020] The liquid discharge housing has a second guiding slope, and the first guiding slope is located below the first liquid discharge port and is used to guide the liquid dropped thereon to the first liquid discharge port.

[0021] A hydrogen fuel system comprises a hydrogen fuel cell and the above-mentioned gas-liquid separation device, wherein the anode of the hydrogen fuel cell has a discharge port and a supply port, the mixed liquid inlet of the gas-liquid separation device is connected to the discharge port, and the exhaust port is connected to the supply port.

[0022] Beneficial effects of the present invention:

[0023] In the gas-liquid separation device and hydrogen fuel system provided by the present invention, a separation core is arranged in a separation shell, so that the mixed fluid entering the separation shell can achieve gas-liquid separation, and the liquid after gas-liquid separation can flow into the discharge shell through the first discharge port when the first discharge port is in an open state, and when the first discharge port is in an open state, the second discharge port is in a blocked state, so that the back pressure of the anode of the hydrogen fuel system is not affected during the process of discharging liquid into the discharge shell, and when the discharge shell discharges liquid through the second discharge port, the first discharge port is in a blocked state, so that the mixed liquid inlet and the discharge port connected to the anode are not connected to the external environment, thereby preventing the problem of lack of anode back pressure and excessive pressure fluctuation, so that the reaction environment of the battery stack can be relatively stable, thereby ensuring the stable output of the battery stack and the hydrogen fuel cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The structure of the gas-liquid separation device provided in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0025] Figure 2 The structure of the gas-liquid separation device provided in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0026] Figure 3 is a top view of a first separation cylinder provided in an embodiment of the present invention;

[0027] Figure 4 is a side view of a first separation cylinder provided in an embodiment of the present invention;

[0028] Figure 5 It is a schematic structural diagram of a gas-liquid separation device showing streamlines provided in an embodiment of the present invention.

[0029] In the figure:

[0030] 1. Separation shell; 11. Mixed liquid inlet; 12. Exhaust port; 13. First liquid discharge port; 14. First guide slope; 2. Separation core; 21. Liquid drop hole; 22. First separation cylinder; 23. Chassis; 3. Liquid discharge shell; 31. Second liquid discharge port; 32. Second guide slope; 4. Step-by-step drainage mechanism; 41. First plug; 42. Second plug; 43. Connector; 44. Drive member; 441. Output end; 5. Second separation cylinder; 10. First separation chamber; 20. Second separation chamber. DETAILED DESCRIPTION

[0031] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, not all.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0036] Embodiment 1

[0037] This embodiment provides a gas-liquid separation device, which can prevent the anode from having a back pressure loss when draining liquid, reduce the pressure fluctuation amplitude of the anode, ensure the stable output of the fuel cell stack, and further ensure the stable operation of the hydrogen fuel system.

[0038] like Figure 1 and Figure 2 As shown, the gas-liquid separation device includes a separation shell 1, a separation core 2, a liquid drainage shell 3 and a distribution drainage mechanism.

[0039] The separation shell 1 is a hollow shell, and has a mixed liquid inlet 11, an exhaust port 12 and a first liquid discharge port 13. The mixed liquid inlet 11 is used to communicate with the exhaust port of the hydrogen fuel cell, so that the mixed fluid discharged from the anode of the hydrogen fuel cell can flow into the separation shell 1 through the mixed liquid inlet 11. The exhaust port 12 is used to discharge the gas after the separation of gas and water. The exhaust port 12 is used to communicate with the supply port of the anode of the hydrogen fuel cell, so that the separated gas (such as hydrogen) can return to the anode. The first liquid discharge port 13 is used to supply the liquid after the gas-liquid separation.

[0040] The separation core 2 is disposed in the separation shell 1 and is used to separate the mixed fluid entering through the mixed liquid inlet 11 from gas to liquid. The liquid discharge shell 3 is connected to the bottom of the separation shell 1 and communicates with the separation shell 1 through the first liquid discharge port 13. The liquid discharged from the first liquid discharge port 13 can fall into the liquid discharge shell 3. The liquid discharge shell 3 has a second liquid discharge port 31, which is used to discharge the liquid in the liquid discharge shell 3.

[0041] Please continue to see Figure 1, the step-by-step drainage mechanism 4 includes a plugging component arranged in the drainage housing 3. The plugging component can plug the first drain port 13 and the second drain port 31, and the plugging component is configured to plug the second drain port 31 when the first drain port 13 is in an open state, so that the first drain port 13 and the second drain port 31 will not be in a state of being opened at the same time, so that the second drain port 31 will not affect the back pressure of the anode when draining, and will not affect the reaction environment of the fuel cell stack. When the first drain port 13 is in an open state, the working state of the first drain port 13 is different from the working state of the second drain port 31. The working state of the first drain port 13 includes a plugged state and an open state, and the working state of the second drain port 31 includes a plugged state and an open state. When the first drain port 13 is in a blocked state, the second drain port 31 can be in an open state or a blocked state. It should be noted that the opening state of the first liquid discharge port 13 includes partially opening and fully opening. When the first liquid discharge port 13 is partially opening, the second liquid discharge port 31 is also in a blocked state. Only when the first liquid discharge port 13 is in a fully blocked state can the second liquid discharge port 31 be in an open state.

[0042] In the gas-liquid separation device provided in the present embodiment, a separation core 2 is arranged in the separation shell 1, so that the mixed fluid entering the separation shell 1 can achieve gas-liquid separation, and the liquid after gas-liquid separation can flow into the discharge shell 3 through the first discharge port 13 when the first discharge port 13 is in an open state, and when the first discharge port 13 is in an open state, the second discharge port 31 is in a blocked state. Therefore, the back pressure of the anode of the hydrogen fuel system will not be affected during the process of discharging liquid into the discharge shell 3. When the discharge shell 3 discharges liquid through the second discharge port 31, the first discharge port 13 is in a blocked state, so that the mixed liquid inlet 11 and the discharge port connected to the anode will not be connected to the external environment, thereby preventing the problem of lack of anode back pressure and excessive pressure fluctuation, so that the reaction environment of the fuel cell stack can be relatively stable, thereby ensuring the stable output of the fuel cell stack and the hydrogen fuel cell.

[0043] Optionally, see Figure 1 and Figure 2 The plugging assembly includes a first plug 41 and a second plug 42. The first plug 41 is used to plug the first drain port 13, and the second plug 42 is used to plug the second drain port 31. In some embodiments, the first plug 41 and the second plug 42 can be made of elastic materials such as rubber and silicone to have a better plugging effect.

[0044] In this embodiment, the first plug 41 and / or the second plug 42 slide in the liquid discharge housing 3 to facilitate driving the first plug 41 and the second plug 42. The sliding connection between the first plug 41 and the second plug 42 and the liquid discharge housing 3 is not limited to a slide rail slider structure, a gear rack structure, etc., and this embodiment does not limit this.

[0045] Further optionally, if Figure 1 As shown, the step-by-step drainage mechanism 4 also includes a connecting member 43 and a driving member 44. Among them, the first plug 41 and the second plug 42 are connected by the connecting member 43, so that the first plug 41 and the second plug 42 can move synchronously. The output end 441 of the driving member 44 is connected to the first plug 41 and / or the second plug 42. In this embodiment, the output end 441 of the driving member 44 is connected to the second plug 42. It should be noted that the driving member 44 is arranged outside the drainage housing 3, and the output end 441 of the driving member 44 is sealed and penetrated in the drainage housing 3. The driving member 44 is exemplified by components such as a cylinder and a motor.

[0046] It should be noted that the gas-liquid separation device may also include a controller, which is connected to the driving member 44. After receiving the drainage instruction, the controller controls the driving member 44 to drive the first plug 41 and the second plug 42 to move in the drainage shell 3, and opens the second drainage port 31 after closing the first drainage port 13, so that the liquid in the drainage shell 3 can flow out smoothly from the second drainage port 31.

[0047] Please continue to see Figure 2 , the liquid discharge housing 3 has a second guiding slope 32, and the second guiding slope 32 is located below the first liquid discharge port 13. The liquid at the first liquid discharge port 13 falls on the second guiding slope 32 under the action of gravity. The second guiding slope 32 is used to guide the liquid dropped thereon to the second liquid discharge port 31 to facilitate the discharge of the liquid. In some embodiments, the second guiding slope 32 is a wall surface of the liquid discharge housing 3 to reduce the material. It should be noted that the wall of the liquid discharge housing 3 that sets the second liquid discharge port 31 is a horizontal wall to facilitate the movement of the second plug 42. The liquid guided by the second guiding slope 32 can flow to the horizontal wall and then be discharged from the second liquid discharge port 31. In some optional embodiments, the cross-section of the liquid discharge housing 3 is trapezoidal.

[0048] The separation core 2 in this embodiment is rotatably disposed in the separation shell 1 to achieve a better gas-liquid separation effect. Figures 3 to 5 As shown, the separation core 2 has a liquid drop hole 21, and the separated liquid falls into the liquid discharge housing 3 through the liquid drop hole 21 and the first liquid discharge port 13. A plurality of liquid drop holes 21 are arranged at intervals to allow more liquid and liquid at different positions to flow through.

[0049] Further optionally, Figure 3 and Figure 4 For a separation core 2 provided in this embodiment, please continue to refer to Figure 3 and Figure 4The separation core 2 includes a first separation cylinder 22 and a chassis 23 connected to the outer periphery of the first separation cylinder 22. The chassis 23 is connected to the outer wall of the first separation cylinder 22, and the chassis 23 is rotatably connected to the separation shell 1. There are many ways for the chassis 23 to be rotatably connected to the separation shell 1, such as being connected to the inner wall of the separation shell 1 through a bearing or other components. The rotation of the chassis 23 can drive the first separation cylinder 22 to rotate, and then can provide centrifugal force for the mixed fluid in the separation shell 1, which is conducive to easing the gas-liquid separation of the fluid. The gas-liquid separation device may also include a motor or other components for driving the chassis 23 to rotate.

[0050] See also Figure 3 The bottom of the bottom plate 23 and the first separation cylinder 22 are respectively provided with liquid drop holes 21, so that the liquid on the inner wall of the separation shell 1 and the outer wall of the first separation cylinder 22 can drip from the liquid drop holes 21 on the bottom plate 23, and the liquid on the inner wall of the first separation cylinder 22 can drip from the liquid drop holes 21 on the bottom of the first separation cylinder 22. The first separation cylinder 22 is a top opening structure, and is spaced apart from the top of the separation shell 1, so that the mixed fluid can flow from the outside of the first separation cylinder 22 through the gap between the first separation cylinder 22 and the top of the separation shell 1 to the inside of the first separation cylinder 22, thereby making the mixed fluid have a longer separation path to improve the separation effect.

[0051] Further optionally, the gas-liquid separation device also includes a second separation cylinder 5. One end of the second separation cylinder 5 is connected to the separation shell 1, and the other end is located in the first separation cylinder 22. In some optional embodiments, the second separation cylinder 5 extends from the top of the first separation cylinder 22 into the first separation cylinder 22, and extends to the middle and lower part of the first separation cylinder 22. The bottom of the second separation cylinder 5 is spaced apart from the bottom of the first separation cylinder 22. A first separation chamber 10 is formed between the outer wall of the first separation cylinder 22 and the inner wall of the separation shell 1, and a second separation chamber 20 is formed between the outer wall of the second separation cylinder 5 and the inner wall of the first separation cylinder 22. The second separation chamber 20 is connected to the first separation chamber 10 and the second separation cylinder 5. The second separation cylinder 5 is connected to the exhaust port 12, and the first separation chamber 10 is connected to the mixed liquid inlet 11. Figure 5As shown, the mixed fluid flowing out of the mixed liquid inlet 11 first enters the first separation chamber 10, and after preliminary gas-liquid separation in the first separation chamber 10, enters the second separation chamber 20 through the gap between the first separation cylinder 22 and the top of the separation shell 1, and flows into the second separation cylinder 5 through the gap between the second separation cylinder 5 and the bottom of the first separation cylinder 22 after gas-liquid separation in the second separation chamber 20. After the final gas-liquid separation in the second separation cylinder 5, the gas is discharged from the exhaust port 12, and the liquid in the separation process falls to the first liquid discharge port 13 through the bottom plate 23 and the liquid drop hole 21 on the first separation cylinder 22. When the first liquid discharge port 13 is blocked by the first plug 41, the liquid gathers at the bottom of the separation shell 1; when the first liquid discharge port 13 is not blocked by the first plug 41, the liquid falls directly into the liquid discharge shell 3 through the first liquid discharge port 13 and gathers in the liquid discharge shell 3.

[0052] It should be noted that liquid level detectors may be provided in both the separation housing 1 and the drainage housing 3 to monitor the liquid levels of the separation housing 1 and the drainage housing 3 in real time to prevent the liquid level from being too high.

[0053] Alternatively, if Figure 1 , Figure 2 and Figure 5 As shown, the mixed liquid inlet 11 is arranged on the side wall of the separation shell 1 and is arranged opposite to the side wall of the first separation cylinder 22, so that the mixed fluid flowing into the mixed liquid inlet 11 can impact on the outer wall of the first separation cylinder 22 to achieve impact separation of gas and liquid. The liquid after impact separation adheres to the outer wall of the first separation cylinder 22 and slides down under the action of gravity, and finally drips through the drop hole 21 on the bottom plate 23. It should be noted that in the radial direction of the separation shell 1, the mixed liquid inlet 11 is arranged opposite to the side wall of the first separation cylinder 22. The exhaust port 12 is arranged at the top of the separation shell 1 and is arranged opposite to the top of the first separation cylinder 22, which is conducive to the discharge of gas.

[0054] In some optional embodiments, the separation shell 1 has a first guiding slope 14, and the first guiding slope 14 is used to guide the liquid dropped from the liquid drop hole 21 to the first liquid discharge port 13, so that the liquid is concentrated and discharged from the first liquid discharge port 13, and the liquid is prevented from being retained in the separation shell 1. In this embodiment, the upper half of the separation shell 1 is columnar, and the lower half is conical, and the first guiding slope 14 is the wall surface of the lower half of the separation shell 1.

[0055] For example, the separation housing 1 and the liquid discharge housing 3 in this embodiment may be an integrally formed structure.

[0056] Embodiment 2

[0057] The difference between this embodiment and the first embodiment lies in that the step-by-step drainage mechanism is different.

[0058] Specifically, the step-by-step drainage mechanism in this embodiment includes two driving members, one of which is connected to the first plug to drive the first plug to block or open the first drainage port, and the other is connected to the second plug to drive the second plug to block or open the second drainage port. The two driving members can drive the first plug and the second plug to move at the same time, or one driving member can first drive the first plug to move to block the first drainage port, and then the other driving member drives the second plug to move to open the second drainage port for drainage. After the drainage is completed, the other driving member first drives the second plug to move to block the second drainage port, and then the first driving member drives the first plug to move to open the first drainage port.

[0059] The other structures in this embodiment are the same as those in the first embodiment and have similar beneficial effects, and will not be described in detail here.

[0060] Embodiment 3

[0061] This embodiment provides a hydrogen fuel system, including a hydrogen fuel cell and the gas-liquid separation device in the first or second embodiment.

[0062] Among them, the anode of the hydrogen fuel cell has a discharge port and a supply port, the mixed liquid inlet 11 of the gas-liquid separation device is connected to the discharge port, and the exhaust port 12 is connected to the supply port. The hydrogen fuel system provided in this embodiment will not have large pressure fluctuations or back pressure water shortage during the drainage process, and has high stability and reliability. Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made to those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may also include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A gas-liquid separation device, characterized in that: include: A separation shell (1), wherein the separation shell (1) has a mixed liquid inlet (11), an exhaust port (12) and a first liquid discharge port (13); A separation core (2) is disposed in the separation shell (1) and is used to separate gas and liquid from the mixed fluid entering through the mixed liquid inlet (11); A liquid discharge housing (3) connected to the bottom of the separation housing (1) and in communication with the separation housing (1) via a first liquid discharge port (13); the liquid discharge housing (3) having a second liquid discharge port (31); The step-by-step drainage mechanism (4) comprises a blocking component arranged in the drainage housing (3), the blocking component being capable of blocking the first drainage port (13) and the second drainage port (31), and the blocking component being configured to block the second drainage port (31) when the first drainage port (13) is open.

2. The gas-liquid separation device according to claim 1, characterized in that: The sealing assembly comprises a first plug (41) and a second plug (42); the first plug (41) can seal the first liquid discharge port (13); the second plug (42) can seal the second liquid discharge port (31); the first plug (41) and / or the second plug (42) slide in the liquid discharge housing (3).

3. The gas-liquid separation device according to claim 2, characterized in that: The step-by-step drainage mechanism (4) further comprises a connecting member (43) and a driving member (44); the first plug (41) and the second plug (42) are connected via the connecting member (43); and an output end (441) of the driving member (44) is connected to the first plug (41) and / or the second plug (42).

4. The gas-liquid separation device according to claim 2, characterized in that: The step-by-step drainage mechanism (4) further comprises two driving members (44), one of the two driving members (44) being connected to the first plug (41) and the other being connected to the second plug (42).

5. The gas-liquid separation device according to any one of claims 1 to 4, characterized in that: The separation core (2) is rotatably disposed in the separation shell (1), and the separation core (2) has a liquid drop hole (21), and the separated liquid falls into the liquid discharge shell (3) through the liquid drop hole (21) and the first liquid discharge port (13).

6. The gas-liquid separation device according to claim 5, characterized in that: The separation core (2) comprises a first separation cylinder (22) and a bottom plate (23) connected to the outer periphery of the first separation cylinder (22); the bottom plate (23) is rotatably connected to the separation shell (1); the bottom of the bottom plate (23) and the first separation cylinder (22) are respectively provided with the liquid drop hole (21); the first separation cylinder (22) is a top opening structure and is spaced apart from the top of the separation shell (1).

7. The gas-liquid separation device according to claim 6, characterized in that: The invention also comprises a second separation cylinder (5), one end of which is connected to the separation shell (1), and the other end of which is located in the first separation cylinder (22); a first separation chamber (10) is formed between the first separation cylinder (22) and the inner wall of the separation shell (1); a second separation chamber (20) is formed between the second separation cylinder (5) and the first separation cylinder (22); the second separation chamber (20) is communicated with the first separation chamber (10) and the second separation cylinder (5); the second separation cylinder (5) is communicated with the exhaust port (12); and the first separation chamber (10) is communicated with the mixed liquid inlet (11).

8. The gas-liquid separation device according to claim 6, characterized in that: The mixed liquid inlet (11) is arranged on the side wall of the separation shell (1) and is arranged opposite to the side wall of the first separation cylinder (22); the exhaust port (12) is arranged on the top of the separation shell (1) and is arranged opposite to the top of the first separation cylinder (22).

9. The gas-liquid separation device according to claim 6, characterized in that: The separation shell (1) has a first guiding slope (14), and the first guiding slope (14) is used to guide the liquid dropped from the liquid drop hole (21) to the first liquid discharge port (13); and / or The liquid discharge housing (3) has a second guiding slope (32), and the first guiding slope (14) is located below the first liquid discharge port (13) and is used to guide the liquid dropped thereon to the first liquid discharge port (13).

10. A hydrogen fuel system, characterized in that: It comprises a hydrogen fuel cell and a gas-liquid separation device as described in any one of claims 1 to 9, wherein the anode of the hydrogen fuel cell has a discharge port and a supply port, the mixed liquid inlet (11) of the gas-liquid separation device is connected to the discharge port, and the exhaust port (12) is connected to the supply port.

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