Fuel cell hydrogen supply system

Abstract

The invention belongs to the technical field of fuel cell systems, and discloses a fuel cell hydrogen supply system which comprises an ejector, a gas-liquid separator integrated on the outer side of the ejector, and a heater integrated in the gas-liquid separator. The heater is located on the top of the gas-liquid separator in the height direction of the gas-liquid separator. The gas-liquid separator is provided with a hydrogen-containing tail gas inlet and a hydrogen-containing tail gas outlet, in the height direction of the gas-liquid separator, the hydrogen-containing tail gas inlet is located in the bottom of the gas-liquid separator, and the hydrogen-containing tail gas outlet is located in the top of the gas-liquid separator and can be communicated with an ejection inlet of the ejector. By adopting the fuel cell hydrogen supply system, liquid in hydrogen-containing tail gas can be effectively separated, the separated hydrogen can be directly heated, and the fuel cell hydrogen supply system is high in integration level.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cell systems, and in particular to a fuel cell hydrogen supply system. Background Art

[0002] Hydrogen fuel cells are power generation devices that directly convert the chemical energy of hydrogen and oxygen into electrical energy. They have the characteristics of high efficiency, high power density, and zero emissions, and have been widely used in various fields.

[0003] The hydrogen supply system is a system for supplying hydrogen to a hydrogen fuel cell and is one of the important components of a fuel cell system. In order to improve the utilization rate of hydrogen, a fuel cell hydrogen supply system in the prior art integrates a gas-water separator on the ejector, and the hydrogen-containing tail gas discharged from the hydrogen fuel cell is passed into the gas-water separator. The gas-water separator is provided with a plurality of staggered water separation plates, and the water in the hydrogen-containing tail gas is separated by the plurality of staggered water separation plates. Although the gas-water separation of the hydrogen-containing tail gas can be achieved, the separated hydrogen cannot be directly adjusted to a suitable temperature range, and the integration of the hydrogen supply system needs to be improved. Summary of the invention

[0004] The object of the present invention is to provide a fuel cell hydrogen supply system to solve the problem that the hydrogen supply system in the prior art cannot directly adjust the temperature of the separated hydrogen to a suitable temperature range, and the integration of the hydrogen supply system needs to be improved.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A fuel cell hydrogen supply system, comprising an ejector, a gas-liquid separator integrated outside the ejector, and a heater integrated inside the gas-liquid separator;

[0007] Along the height direction of the gas-liquid separator, the heater is located at the top of the gas-liquid separator;

[0008] The gas-liquid separator is provided with a hydrogen-containing exhaust gas inlet and a hydrogen-containing exhaust gas outlet. Along the height direction of the gas-liquid separator, the hydrogen-containing exhaust gas inlet is located at the bottom of the gas-liquid separator, and the hydrogen-containing exhaust gas outlet is located at the top of the gas-liquid separator and can be connected to the ejection inlet of the ejector.

[0009] As a preferred solution of the above-mentioned fuel cell hydrogen supply system, the gas-liquid separator is also provided with a low-temperature coolant inlet and a low-temperature coolant outlet. Along the height direction of the gas-liquid separator, the low-temperature coolant inlet is located at the bottom of the gas-liquid separator, the low-temperature coolant outlet is located between the heater and the low-temperature coolant inlet, and the hydrogen-containing exhaust gas inlet is located between the low-temperature coolant inlet and the low-temperature coolant outlet.

[0010] As a preferred solution of the above fuel cell hydrogen supply system, a water dividing plate is further provided in the gas-liquid separator, and along the height direction of the gas-liquid separator, the water dividing plate is located between the low-temperature coolant outlet and the hydrogen-containing tail gas outlet.

[0011] As a preferred solution of the above-mentioned fuel cell hydrogen supply system, the heater includes a heater shell, and the heater shell is provided with a high-temperature coolant inlet and a high-temperature coolant outlet. Along the height direction of the gas-liquid separator, the high-temperature coolant outlet is located above the high-temperature coolant inlet.

[0012] As a preferred solution of the above-mentioned fuel cell hydrogen supply system, the heater further comprises an electric heating wire disposed in the heater housing, and the electric heating wire is electrically connected to a power source.

[0013] As a preferred embodiment of the above-mentioned fuel cell hydrogen supply system, the fuel cell hydrogen supply system also includes a circulation pump integrated on the outside of the ejector, the input end of the circulation pump is connected to the hydrogen-containing exhaust gas outlet, and the output end of the circulation pump is connected to the ejector inlet.

[0014] As a preferred solution of the above-mentioned fuel cell hydrogen supply system, the input end of the circulation pump is connected to the hydrogen-containing tail gas outlet through an air intake hose; and / or the output end of the circulation pump is connected to the injection inlet through a return air hose.

[0015] As a preferred embodiment of the above-mentioned fuel cell hydrogen supply system, the fuel cell hydrogen supply system also includes a hydrogen injection valve integrated at the air inlet of the ejector, and a stop valve integrated at the inlet of the hydrogen injection valve, and the stop valve, the hydrogen injection valve and the air inlet are connected in sequence.

[0016] As a preferred solution of the above-mentioned fuel cell hydrogen supply system, the ejector is provided with a drainage hole, and the drainage hole connects the mixing chamber of the ejector and the interior of the gas-liquid separator.

[0017] As a preferred solution of the above-mentioned fuel cell hydrogen supply system, the gas-liquid separator is also integrated with a drain valve. Along the height direction of the gas-liquid separator, the drain valve is located at the bottom of the gas-liquid separator, and the drain valve can connect the interior of the gas-liquid separator with the outside.

[0018] Beneficial effects of the present invention:

[0019] The present invention provides a fuel cell hydrogen supply system, which includes an ejector, a gas-liquid separator integrated on the outside of the ejector, and a heater integrated in the gas-liquid separator. Along the height direction of the gas-liquid separator, the heater is located at the top of the gas-liquid separator. The gas-liquid separator is provided with a hydrogen-containing tail gas inlet and a hydrogen-containing tail gas outlet. Along the height direction of the gas-liquid separator, the hydrogen-containing tail gas inlet is located at the bottom of the gas-liquid separator, and the hydrogen-containing tail gas outlet is located at the top of the gas-liquid separator and can be communicated with the ejection inlet of the ejector.

[0020] The fuel cell hydrogen supply system passes the hydrogen-containing tail gas discharged from the fuel cell into the gas-liquid separator from the hydrogen-containing tail gas inlet, and the hydrogen-containing tail gas is separated into gas and liquid by the gas-liquid separator; it can be understood that the separated hydrogen is lighter in weight and will flow to the top of the gas-liquid separator and accumulate, and the separated liquid is heavier in weight and will flow to the bottom of the gas-liquid separator and accumulate; by arranging a heater at the top of the gas-liquid separator, the heater can heat the separated hydrogen, so that the hydrogen is heated and then flows from the hydrogen-containing tail gas outlet to the inlet of the ejector, and is finally transported to the fuel cell by the ejector. So that compared with the prior art, it can not only effectively separate the liquid in the hydrogen-containing tail gas, but also directly heat the separated hydrogen, thereby effectively improving the efficiency of the electrochemical reaction of the fuel cell. Secondly, the heater is integrated into the top of the gas-liquid separator, which can effectively improve the integration of the fuel cell hydrogen supply system.

[0021] Therefore, by adopting the fuel cell hydrogen supply system, the liquid in the hydrogen-containing tail gas can be effectively separated, and the separated hydrogen can be directly heated, and the fuel cell hydrogen supply system has a high degree of integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a structural schematic diagram of a fuel cell hydrogen supply system provided by a specific embodiment of the present invention;

[0023] Figure 2 is a cross-sectional view of a fuel cell hydrogen supply system provided by a specific embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of a fuel cell hydrogen supply system provided by a specific embodiment of the present invention.

[0025] In the figure:

[0026] 100. Fuel cells;

[0027] 1. Ejector; 11. Drain hole; 12. Mixing chamber; 13. Air outlet;

[0028] 2. Gas-liquid separator; 21. Hydrogen-containing tail gas inlet; 22. Low-temperature coolant inlet; 23. Low-temperature coolant outlet;

[0029] 3. Heater housing; 31. High-temperature coolant inlet; 32. High-temperature coolant outlet;

[0030] 41. Circulation pump; 42. Motor;

[0031] 51. Air intake hose; 52. Air return hose;

[0032] 61. Hydrogen injection valve; 62. Stop valve;

[0033] 7. Drain valve;

[0034] 8. Safety valve;

[0035] 91. A first pressure sensor; 92. A second pressure sensor; 93. A third pressure sensor. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be 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 ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] like Figure 1-3 As shown, the present invention provides a fuel cell hydrogen supply system, which includes an ejector 1, a gas-liquid separator 2 integrated on the outside of the ejector 1, and a heater integrated in the gas-liquid separator 2. Along the height direction of the gas-liquid separator 2, the heater is located at the top of the gas-liquid separator 2. The gas-liquid separator 2 is provided with a hydrogen-containing tail gas inlet 21 and a hydrogen-containing tail gas outlet. Along the height direction of the gas-liquid separator 2, the hydrogen-containing tail gas inlet 21 is located at the bottom of the gas-liquid separator 2, and the hydrogen-containing tail gas outlet is located at the top of the gas-liquid separator 2 and can be communicated with the ejection inlet of the ejector 1.

[0041] The fuel cell hydrogen supply system passes the hydrogen-containing tail gas discharged from the fuel cell 100 into the gas-liquid separator 2 through the hydrogen-containing tail gas inlet 21, and the hydrogen-containing tail gas is separated into gas and liquid by the gas-liquid separator 2; it can be understood that the weight of the separated hydrogen is lighter, and it will flow to the top of the gas-liquid separator 2 and accumulate, and the weight of the separated liquid is heavier, and it will flow to the bottom of the gas-liquid separator 2 and accumulate; by arranging a heater at the top of the gas-liquid separator 2, the heater can heat the separated hydrogen, so that the hydrogen is heated and then flows from the hydrogen-containing tail gas outlet to the inlet of the ejector 1, and finally transported to the fuel cell 100 by the ejector 1. Compared with the prior art, it can not only effectively separate the liquid in the hydrogen-containing tail gas, but also directly heat the separated hydrogen, so as to effectively improve the efficiency of the electrochemical reaction of the fuel cell 100. Secondly, the heater is integrated in the top of the gas-liquid separator 2, which can effectively improve the integration of the fuel cell hydrogen supply system.

[0042] Therefore, by adopting the fuel cell hydrogen supply system, the liquid in the hydrogen-containing tail gas can be effectively separated, and the separated hydrogen can be directly heated, and the fuel cell hydrogen supply system has a high degree of integration.

[0043] Alternatively, if Figure 1 and Figure 2As shown, the gas-liquid separator 2 is further provided with a low-temperature coolant inlet 22 and a low-temperature coolant outlet 23. Along the height direction of the gas-liquid separator 2, the low-temperature coolant inlet 22 is located at the bottom of the gas-liquid separator 2, the low-temperature coolant outlet 23 is located between the heater and the low-temperature coolant inlet 22, and the hydrogen-containing tail gas inlet 21 is located between the low-temperature coolant inlet 22 and the low-temperature coolant outlet 23. Specifically, when the hydrogen-containing tail gas discharged from the fuel cell 100 is to be introduced into the gas-liquid separator 2 through the hydrogen-containing tail gas inlet 21, the low-temperature coolant is introduced into the gas-liquid separator 2 through the low-temperature coolant inlet 22, and the hydrogen-containing tail gas contacts the low-temperature coolant, so that the liquid in the hydrogen-containing tail gas can be condensed, and the separated hydrogen flows to the top of the gas-liquid separator 2 and accumulates, and the separated liquid is mixed with the low-temperature coolant and can flow out from the low-temperature coolant outlet 23 together with the low-temperature coolant. So that the gas-liquid separation can be effectively performed.

[0044] Further optionally, a water divider is further provided in the gas-liquid separator 2, and the water divider is located between the low-temperature coolant outlet 23 and the hydrogen-containing tail gas outlet along the height direction of the gas-liquid separator 2. The hydrogen-containing tail gas separated by the low-temperature coolant can be further separated by the water divider for gas-liquid separation, thereby further improving the separation effect of the gas-liquid separation of the hydrogen-containing tail gas. Specifically, the water divider is fixedly connected to the inner peripheral wall of the gas-liquid separator 2, and is arranged at an angle to the height direction of the gas-liquid separator 2.

[0045] Further optionally, there are multiple water divider plates, which are alternately distributed along the height direction of the gas-liquid separator 2. This can further improve the gas-liquid separation effect of hydrogen-containing tail gas.

[0046] As an alternative, a condenser or the like may also be provided in the gas-liquid separator 2. It is sufficient that the hydrogen-containing tail gas can be separated into gas and liquid.

[0047] In this embodiment, if Figure 1 and Figure 2 As shown, it is exemplified that the gas-liquid separator 2 is provided with a low-temperature coolant inlet 22 and a low-temperature coolant outlet 23 .

[0048] It can be understood that, for the gas-liquid separator 2 that is only provided with a low-temperature coolant inlet 22 and a low-temperature coolant outlet 23, the low-temperature coolant can effectively condense and separate the liquid in the hydrogen-containing tail gas when the temperature of the hydrogen-containing tail gas is higher than the temperature of the low-temperature coolant flowing into the gas-liquid separator 2 from the low-temperature coolant inlet 22. For the gas-liquid separator 2 that is only provided with a low-temperature coolant inlet 22, a low-temperature coolant outlet 23 and a water separator, when the temperature of the hydrogen-containing tail gas is lower than the temperature of the low-temperature coolant flowing into the gas-liquid separator 2 from the low-temperature coolant inlet 22, the water separator performs gas-liquid separation on the hydrogen-containing tail gas.

[0049] Alternatively, if Figure 1 and Figure 2 As shown, the heater includes a heater housing 3, and the heater housing 3 is provided with a high-temperature coolant inlet 31 and a high-temperature coolant outlet 32. Along the height direction of the gas-liquid separator 2, the high-temperature coolant outlet 32 ​​is located above the high-temperature coolant inlet 31. The high-temperature coolant is introduced into the heater housing 3 through the high-temperature coolant inlet 31, and the hydrogen flowing to the top of the gas-liquid separator 2 is heated by heat exchange with the high-temperature coolant, so that the separated hydrogen can be effectively heated.

[0050] Further optionally, the heater also includes an electric heating wire disposed in the heater housing 3, and the electric heating wire is electrically connected to the power supply. When the high-temperature coolant is not sufficient to heat the separated hydrogen, the separated hydrogen is heated by the electric heating wire so that the separated hydrogen can be effectively heated to the expected temperature and energy consumption can be effectively reduced. The electric heating wire can also be turned on synchronously when the high-temperature coolant is introduced into the heater housing 3 through the high-temperature coolant inlet 31. The electric heating wire can also be turned on directly without introducing the high-temperature coolant into the heater housing 3.

[0051] As an alternative, an electric heater may be directly selected and arranged at the top of the gas-liquid separator 2 as a heater, which can also effectively heat the separated hydrogen to a desired temperature.

[0052] In this embodiment, if Figure 1 and Figure 2 As shown, it is exemplified that the heater housing 3 is provided with a high-temperature coolant inlet 31 and a high-temperature coolant outlet 32 ​​.

[0053] Preferably, a one-way valve is provided at the hydrogen-containing tail gas inlet 21, a one-way valve is provided at the low-temperature coolant inlet 22, and a one-way valve is provided at the high-temperature coolant inlet 31 to prevent backflow.

[0054] Alternatively, if Figure 1-3 As shown, the fuel cell hydrogen supply system also includes a circulation pump 41 integrated on the outside of the ejector 1, the input end of the circulation pump 41 is connected to the outlet of the hydrogen-containing tail gas, and the output end of the circulation pump 41 is connected to the ejector inlet. This allows the flow rate of hydrogen injected into the ejector 1 to be adjusted, thereby adjusting the flow rate of hydrogen delivered to the fuel cell 100; secondly, the integration of the fuel cell hydrogen supply system can be further improved. Specifically, the circulation pump 41 is driven by a motor 42, and the motor 42 is integrated on the outside of the ejector 1.

[0055] Preferably, if Figure 1-3 As shown, the input end of the circulation pump 41 is connected to the outlet of the hydrogen-containing tail gas through an air intake hose 51. And / or, the output end of the circulation pump 41 is connected to the ejector inlet through a return air hose 52. The circulation pump 41 is conveniently arranged so that the circulation pump 41 can effectively eject the separated hydrogen to the ejector 1.

[0056] In this embodiment, if Figure 1-3 As shown, the input end of the circulation pump 41 is preferably connected to the hydrogen-containing tail gas outlet through an intake hose 51 , and the output end of the circulation pump 41 is connected to the injection inlet through a return hose 52 .

[0057] In this embodiment, if Figure 1 and Figure 2 As shown, along the height direction of the gas-liquid separator 2 , the gas-liquid separator 2 is exemplarily arranged to be located below the ejector 1 , and the circulation pump 41 and the motor 42 are both located above the ejector 1 .

[0058] As an alternative, the input end of the circulation pump 41 may be connected to the hydrogen-containing tail gas outlet, and the output end of the circulation pump 41 may be connected to the ejector outlet. In this case, the circulation pump 41 is connected in parallel with the ejector 1. The flow rate of hydrogen delivered to the fuel cell 100 can also be adjusted.

[0059] Among them, Figure 1-3 As shown, the fuel cell hydrogen supply system also includes a hydrogen injection valve 61 integrated at the air inlet of the ejector 1, and a stop valve 62 integrated at the inlet of the hydrogen injection valve 61, and the stop valve 62, the hydrogen injection valve 61 and the air inlet are connected in sequence. The stop valve 62 can switch on and off the hydrogen source and the hydrogen injection valve 61, and can prevent the backflow of hydrogen. The hydrogen injection valve 61 can adjust the flow rate of hydrogen delivered to the ejector 1, thereby further adjusting the flow rate of hydrogen delivered to the fuel cell 100; secondly, the integration of the fuel cell hydrogen supply system can be further improved.

[0060] Among them, Figure 2 As shown, the ejector 1 is provided with a drain hole 11, and the drain hole 11 connects the mixing chamber 12 of the ejector 1 with the inside of the gas-liquid separator 2. The condensed liquid in the mixing chamber 12 can flow directly into the gas-liquid separator 2, so as to discharge the condensed liquid in the mixing chamber 12. Specifically, the aperture of the drain hole 11 is calculated by CFD simulation, and the aperture of the drain hole 11 cannot be too large or too small. If it is too small, it is not conducive to drainage. If it is too large, the hydrogen gas pressurized by the circulating pump 41 will be rushed back into the gas-liquid separator 2 through the drain hole 11, which will reduce the utilization rate of hydrogen.

[0061] Preferably, if Figure 2 As shown, along the height direction of the gas-liquid separator 2, the drainage hole 11 is located at the bottom of the mixing chamber 12, so that the condensed liquid in the mixing chamber 12 directly flows into the gas-liquid separator 2 under the action of gravity.

[0062] Preferably, if Figure 1-3As shown, the gas-liquid separator 2 is also integrated with a drain valve 7, which is located at the bottom of the gas-liquid separator 2 along the height direction of the gas-liquid separator 2, and the drain valve 7 can connect the inside of the gas-liquid separator 2 with the outside, so that the condensed liquid in the mixing chamber 12 can be discharged from the gas-liquid separator 2, which further improves the integration of the fuel cell hydrogen supply system.

[0063] Preferably, if Figure 1 and Figure 3 As shown, the ejector 1 is integrated with a safety valve 8, which is located at the gas outlet 13 of the ejector 1 and is connected to the gas outlet 13. When the pressure of the hydrogen flowing out of the ejector 1 is greater than the safety pressure, the safety valve 8 automatically opens to discharge a portion of the hydrogen to improve the safety of the fuel cell hydrogen supply system. Specifically, the output end of the safety valve 8 can be selectively connected to a structure such as a hydrogen source or a hydrogen recovery bottle to enable the recovery of the portion of hydrogen.

[0064] Alternatively, if Figure 1-3 As shown, a first pressure sensor 91 is integrated at the outlet of the stop valve 62. Alternatively, a first pressure sensor 91 is provided on the pipeline connecting the stop valve 62 and the hydrogen injection valve 61 to monitor the pressure of hydrogen delivered to the hydrogen injection valve 61.

[0065] Alternatively, if Figure 1-3 As shown, the second pressure sensor 92 is integrated at the gas outlet 13 of the ejector 1. Alternatively, the second pressure sensor 92 is provided on the pipeline connecting the gas outlet 13 of the ejector 1 and the fuel cell 100 to monitor the pressure of hydrogen delivered to the fuel cell 100.

[0066] Optionally, a third pressure sensor 93 is integrated at the hydrogen-containing tail gas outlet of the gas-liquid separator 2. Figure 3 As shown, a third pressure sensor 93 is provided on the pipeline connecting the hydrogen-containing tail gas outlet of the gas-liquid separator 2 and the circulation pump 41 to monitor the hydrogen pressure output by the gas-liquid separator 2 .

[0067] Among them, the specific structure of the ejector 1 belongs to the existing technology and will not be repeated here.

[0068] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A fuel cell hydrogen supply system, characterized in that: It comprises an ejector (1), a gas-liquid separator (2) integrated on the outside of the ejector (1), and a heater integrated in the gas-liquid separator (2); Along the height direction of the gas-liquid separator (2), the heater is located at the top of the gas-liquid separator (2); The gas-liquid separator (2) is provided with a hydrogen-containing tail gas inlet (21) and a hydrogen-containing tail gas outlet. Along the height direction of the gas-liquid separator (2), the hydrogen-containing tail gas inlet (21) is located at the bottom of the gas-liquid separator (2), and the hydrogen-containing tail gas outlet is located at the top of the gas-liquid separator (2) and can be communicated with the ejector inlet of the ejector (1).

2. The fuel cell hydrogen supply system according to claim 1, characterized in that: The gas-liquid separator (2) is also provided with a low-temperature coolant inlet (22) and a low-temperature coolant outlet (23). Along the height direction of the gas-liquid separator (2), the low-temperature coolant inlet (22) is located at the bottom of the gas-liquid separator (2), the low-temperature coolant outlet (23) is located between the heater and the low-temperature coolant inlet (22), and the hydrogen-containing tail gas inlet (21) is located between the low-temperature coolant inlet (22) and the low-temperature coolant outlet (23).

3. The fuel cell hydrogen supply system according to claim 2, characterized in that: A water dividing plate is also provided in the gas-liquid separator (2). Along the height direction of the gas-liquid separator (2), the water dividing plate is located between the low-temperature coolant outlet (23) and the hydrogen-containing tail gas outlet.

4. The fuel cell hydrogen supply system according to claim 1, characterized in that: The heater comprises a heater housing (3), the heater housing (3) being provided with a high-temperature coolant inlet (31) and a high-temperature coolant outlet (32), and along the height direction of the gas-liquid separator (2), the high-temperature coolant outlet (32) being located above the high-temperature coolant inlet (31).

5. The fuel cell hydrogen supply system according to claim 4, characterized in that: The heater also includes an electric heating wire arranged in the heater housing (3), and the electric heating wire is electrically connected to a power source.

6. The fuel cell hydrogen supply system according to any one of claims 1 to 5, characterized in that: The fuel cell hydrogen supply system further comprises a circulation pump (41) integrated on the outside of the ejector (1), wherein the input end of the circulation pump (41) is connected to the hydrogen-containing tail gas outlet, and the output end of the circulation pump (41) is connected to the ejector inlet.

7. The fuel cell hydrogen supply system according to claim 6, characterized in that: The input end of the circulation pump (41) is connected to the hydrogen-containing tail gas outlet via an air intake hose (51); and / or the output end of the circulation pump (41) is connected to the injection inlet via a return air hose (52).

8. The fuel cell hydrogen supply system according to any one of claims 1 to 5, characterized in that: The fuel cell hydrogen supply system further comprises a hydrogen injection valve (61) integrated at the air inlet of the ejector (1), and a stop valve (62) integrated at the inlet of the hydrogen injection valve (61), wherein the stop valve (62), the hydrogen injection valve (61) and the air inlet are connected in sequence.

9. The fuel cell hydrogen supply system according to any one of claims 1 to 5, characterized in that: The ejector (1) is provided with a drainage hole (11), and the drainage hole (11) connects the mixing chamber (12) of the ejector (1) and the interior of the gas-liquid separator (2).

10. The fuel cell hydrogen supply system according to claim 9, characterized in that: The gas-liquid separator (2) is also integrated with a drain valve (7). The drain valve (7) is located at the bottom of the gas-liquid separator (2) along the height direction of the gas-liquid separator (2), and the drain valve (7) can connect the inside of the gas-liquid separator (2) with the outside.

Images