CN219246733U

CN219246733U - Fuel cell system

Info

Publication number: CN219246733U
Application number: CN202320137045.8U
Authority: CN
Inventors: 蒋恩杰; 何一凡; 施昕; 王�琦; 翟双
Original assignee: Shanghai Re Fire Energy and Technology Co Ltd
Current assignee: Shanghai Re Fire Energy and Technology Co Ltd
Priority date: 2023-01-13
Filing date: 2023-01-13
Publication date: 2023-06-23
Anticipated expiration: 2033-01-13

Abstract

The application provides a fuel cell system, including the electric pile, the air compressor machine, the intercooler, the water knockout drum, humidifier and tail calandria, the humidifier has first entry, first export, second entry and second export, the air compressor machine passes through intercooler and first entry intercommunication, first export and the negative pole entry intercommunication of electric pile, the negative pole export and the second entry intercommunication of electric pile, the air flows through the air compressor machine in proper order, the intercooler, first entry, first export, the negative pole entry of electric pile, the negative pole export of electric pile, the second entry, the second export back is discharged from the tail calandria, the positive pole and the water knockout drum intercommunication of electric pile, water knockout drum and second entry intercommunication. The humidifier can make full use of water generated by the humidifier, continuously recycle, and finally ensure the air entering the cathode of the electric pile to meet the reaction requirement through the wet heat exchange and the moisture transmission between the dry side inlet and the wet side inlet of the humidifier, so as to ensure the service life of the system.

Description

Fuel cell system

Technical Field

The present application relates to the field of fuel cell technology, and in particular, to a fuel cell system.

Background

With the increasing increase of air pollution, green energy without pollution is actively searched for all countries around the world in recent years. Because the fuel of the fuel cell is hydrogen and oxygen, the product is clean water, and the fuel cell does not produce carbon monoxide and carbon dioxide and does not discharge sulfur and particles, thus being a real green energy source.

Temperature and humidity are critical to the use of the fuel cell, improper control can seriously affect the performance and life of the fuel cell, and for a counter-current fuel cell, excessive intake air temperature can easily cause the inlet membrane electrode to dry out and fail; too low relative humidity can also easily lead to drying of the membrane electrode, performance degradation, pinhole formation, hydrogen-air channeling, flooding due to too high relative humidity, and performance degradation.

Along with commercialization of high-power fuel cells, especially high-power heavy truck service conditions, the high-power heavy truck service conditions are limited by the arrangement space of the whole vehicle, and the heat dissipation capacity is limited, so that the operating temperature of the system is required to be continuously increased, the dry side inlet temperature (equivalent to the cooling inlet temperature of a galvanic pile) of the humidifier and the wet side inlet temperature (equivalent to the cooling outlet temperature of the galvanic pile) of the humidifier are caused to be increased, the air temperature at the cathode inlet is synchronously increased, the relative humidity is reduced, and the water content of a membrane electrode is gradually reduced due to concentration difference effect, so that the membrane dry burning and penetrating failure finally occurs.

Therefore, there is a need in the art to address the problem of excessive cathode inlet temperature of the stack due to excessive humidifier dry side inlet temperature.

Disclosure of Invention

In order to solve the problem that in the prior art, the temperature of a cathode inlet of a galvanic pile is too high, which is caused by insufficient heat dissipation, and dry burning of a membrane electrode is caused, the temperature of a dry side inlet of a humidifier is reduced by utilizing water evaporation and heat dissipation through introducing water in a water separator into a wet side inlet of the humidifier, so that the aim of reducing the temperature of the cathode inlet of the galvanic pile is fulfilled.

In order to solve the technical problem, the application provides a fuel cell system, including electric pile, air compressor machine, intercooler, water knockout drum, humidifier and tail calandria, the humidifier has first entry, first export, second entry and second export, the air compressor machine pass through the intercooler with first entry intercommunication, first export with the negative pole entry intercommunication of electric pile, the negative pole export of electric pile with the second entry intercommunication, the air flow in proper order air compressor machine, intercooler first entry the first export the negative pole entry of electric pile, the negative pole export of electric pile, the second entry the second export back is followed tail calandria is discharged, the positive pole of electric pile with the water knockout drum intercommunication, the water knockout drum with the second entry intercommunication. According to the water separator and the anode of the galvanic pile, the water separator is used for separating and storing liquid water generated by the anode of the galvanic pile, the water separator is communicated with the second inlet (wet side inlet) of the humidifier, water in the water separator can flow into the second inlet of the humidifier, water entering the humidifier from the second inlet evaporates and absorbs heat, the air temperature at the first inlet (dry side inlet) can be effectively reduced, and meanwhile, more moisture is transmitted from the second inlet to the first inlet to improve the air humidity entering from the first inlet, so that the temperature and the humidity of air flowing out from the first outlet can meet the use requirement of the galvanic pile, and the membrane electrode is not burnt out due to drying. The humidifier can make full use of water generated by the humidifier, continuously recycle, and finally ensure the service life of the system by enabling air entering the cathode of the galvanic pile to meet the reaction requirement through wet heat exchange and moisture transmission between the dry side inlet (first inlet) and the wet side inlet (second inlet) of the humidifier. Compared with other humidification schemes, the humidifier does not need additional power consumption, is high in system efficiency and long in service life.

Preferably, a first electromagnetic valve is arranged on the water separator, and the water separator is communicated with the second inlet through the first electromagnetic valve. Through setting up first solenoid valve between water knockout drum and second entry, can switch on between through first solenoid valve control water knockout drum and the second entry, can be selectively open first solenoid valve when the cathode entry department temperature or humidity of electric pile does not satisfy the work demand of electric pile, the water in the water knockout drum can be let in the second entry this moment, and then takes place damp heat exchange with first entry department for from the air of first export discharge satisfies the user demand.

Preferably, a second electromagnetic valve is arranged on the water separator, and the water separator is communicated with the tail drain pipe through the second electromagnetic valve. The water knockout drum is switched on with the tail calandria through the second solenoid valve, and when the temperature and the humidity of the air of the cathode entrance of electric pile satisfy the reaction demand, need not the air condition of adjustment electric pile cathode entrance this moment, so first solenoid valve is closed, in order to be convenient for the water discharge in the water knockout drum, sets up the second solenoid valve between water knockout drum and tail calandria, and control second solenoid valve at this moment switches on and can accomplish the water discharge in the water knockout drum.

Preferably, the device further comprises a controller, wherein the controller can control the first electromagnetic valve or the second electromagnetic valve to be opened and closed. According to the method and the device, the controller is arranged, and the first electromagnetic valve or the second electromagnetic valve can be selectively opened according to the air state of the cathode inlet of the electric pile so as to determine whether to change the air state of the cathode inlet of the electric pile.

Preferably, a third electromagnetic valve is arranged at the first inlet, a fourth electromagnetic valve is arranged at the second outlet, and when the air compressor stops working, the third electromagnetic valve and the fourth electromagnetic valve are closed. Because part of hydrogen can enter the humidifier through the first electromagnetic valve, when the air compressor stops working, the first inlet and the second outlet of the humidifier are required to be closed, so that the hydrogen cannot flow into a high-pressure device, and the function of sealing and retaining hydrogen is realized while the safety is ensured.

Preferably, a fifth electromagnetic valve is arranged between the intercooler and the tail drain. The intercooler and the tail calandria are communicated, a fifth electromagnetic valve is arranged between the intercooler and the tail calandria, partial air flow can be bypassed when the fifth electromagnetic valve is opened, surging is prevented from occurring, hydrogen in the tail calandria can be diluted, and safety problems caused by overhigh hydrogen emission concentration are prevented.

Preferably, a bypass pipeline is arranged between the second inlet and the second outlet, and a sixth electromagnetic valve is arranged on the bypass pipeline. When the air humidity at the cathode inlet of the electric pile is too high, the sixth electromagnetic valve can be opened at the moment, so that part of wet air bypasses the humidifier, and finally the flow of the wet air entering the second inlet of the humidifier is reduced, so that the moisture transmission between the wet side and the dry side of the humidifier is reduced, and finally the air humidity at the cathode inlet of the electric pile is improved.

Preferably, a first temperature and pressure sensor is arranged between the first outlet and the cathode inlet of the electric pile, and a second temperature and pressure sensor is arranged between the second inlet and the cathode outlet of the electric pile. The first temperature and pressure sensor is arranged between the first outlet of the humidifier and the cathode inlet of the electric pile and can detect the temperature and pressure of air at the cathode inlet of the electric pile, and the second temperature and pressure sensor is arranged between the cathode outlet of the electric pile and the second inlet of the humidifier and can detect the temperature and pressure of air at the cathode outlet of the electric pile.

Preferably, the cooling liquid inlet of the electric pile is provided with a first temperature sensor, and the cooling liquid outlet of the electric pile is provided with a second temperature sensor. The first temperature sensor and the second temperature sensor are capable of detecting the temperature of the coolant flowing into and out of the stack.

Preferably, a flowmeter is further arranged at the air inlet of the air compressor. Through setting up the flowmeter in the entrance of air compressor machine, the flowmeter can calculate the air flow that gets into the air compressor machine.

Compared with the prior art, the application has at least the following technical effects: according to the water separator and the anode of the galvanic pile, the water separator is used for separating and storing liquid water generated by the anode of the galvanic pile, the water separator is communicated with the second inlet (wet side inlet) of the humidifier, water in the water separator can flow into the second inlet of the humidifier, water entering the humidifier from the second inlet evaporates and absorbs heat, the air temperature at the first inlet (dry side inlet) can be effectively reduced, and meanwhile, more moisture is transmitted from the second inlet to the first inlet to improve the air humidity entering from the first inlet, so that the temperature and the humidity of air flowing out from the first outlet can meet the use requirement of the galvanic pile, and the membrane electrode is not burnt out due to drying. The humidifier can make full use of water generated by the humidifier, continuously recycle, and finally ensure the service life of the system by enabling air entering the cathode of the galvanic pile to meet the reaction requirement through wet heat exchange and moisture transmission between the dry side inlet (first inlet) and the wet side inlet (second inlet) of the humidifier. Compared with other humidification schemes, the humidifier does not need additional power consumption, is high in system efficiency and long in service life.

Drawings

Fig. 1 is a schematic structural view of a fuel cell system of the present application.

The names of the various components marked in the figures are as follows: 1. a controller; 2. a flow meter; 3. an air compressor; 4. an intercooler; 5. a humidifier; 51. a first inlet; 52. a first outlet; 53. a second inlet; 54. a second outlet; 6. a first temperature and pressure sensor; 7. a second temperature and pressure sensor; 8. a third electromagnetic valve; 9. a fourth electromagnetic valve; 10. a fifth electromagnetic valve; 11. a sixth electromagnetic valve; 12. a first electromagnetic valve; 13. a water separator; 14. a galvanic pile; 15. a water pump; 16. a first temperature sensor; 17. a second temperature sensor; 18. a waterway flowmeter; 19. and a second electromagnetic valve.

Detailed Description

In order to more clearly illustrate the general concepts of the present application, a detailed description is provided below by way of example in connection with the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced otherwise than as described herein, and thus the scope of the present application is not limited by the specific embodiments disclosed below.

In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. The positional relationship of "upstream", "downstream" and the like is based on the positional relationship when the fluid normally flows.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The application provides a fuel cell system, which comprises a galvanic pile 14, an air compressor 3, an intercooler 4, a humidifier 5, a tail drain pipe and the like, wherein the humidifier 5 is provided with a first inlet 51, a first outlet 52, a second inlet 53 and a second outlet 54, the air outlet of the air compressor 3 is communicated with the air inlet of the intercooler 4, the air outlet of the intercooler 4 is communicated with the first inlet 51 (i.e. a dry side inlet) of the humidifier 5, the first outlet 52 (i.e. a dry side outlet) of the humidifier 5 is communicated with the cathode inlet of the galvanic pile 14, the cathode outlet of the galvanic pile 14 is communicated with the second inlet 53 (i.e. a wet side inlet) of the humidifier 5, the second outlet 54 (i.e. a wet side outlet) of the humidifier 5 is communicated with the tail drain pipe, high-temperature air compressed by the air compressor 3 flows into the humidifier 5 from the first inlet 51 of the humidifier 5 after being cooled by the intercooler 4, flows out of the first outlet 52 of the humidifier 5 after being humidified in the humidifier 5 and is communicated with the cathode inlet of the galvanic pile 14, the wet air after being discharged from the cathode outlet 14 is discharged from the second outlet 53 to the tail drain pipe of the humidifier 5 from the humidifier 5.

The positive pole of the electric pile 14 of the fuel cell system of this application is provided with water knockout drum 13, and water knockout drum 13 is used for separating and collecting the liquid water that electric pile 14 positive pole produced, and water knockout drum 13 and the second entry 53 intercommunication of humidifier 5, and liquid water in the water knockout drum 13 can be let in the second entry 53 of humidifier 5, and the liquid water evaporation that lets in the humidifier 5 can reduce the temperature of the air that the humidifier 5 first entry 51 (dry side entrance) got into, also can improve the humidity of the dry air that flows in from first entry 51 (dry side entrance) simultaneously for the temperature and the humidity of the air that lets in electric pile 14 negative pole entrance can satisfy the user demand, are unlikely to make the membrane electrode dry burn out.

The humidifier 5 of this application can make full use of the water that self generated, constantly cyclic utilization, through the wet heat exchange and the moisture transmission between humidifier 5 dry side entry (first entry 51) and the wet side entry (second entry 53), finally makes the air that gets into the electric pile 14 negative pole satisfy the reaction requirement, ensures system life. Compared with other humidification schemes, the humidifier 5 has the advantages of no additional power consumption, high system efficiency and long service life.

The stack 14 of the fuel cell system of the present application has a coolant inlet and a coolant outlet, a circulation path is formed between the coolant inlet, the stack 14, and the coolant outlet, and a water pump 15 is further provided between the coolant inlet and the coolant outlet, and the water pump 15 can drive the coolant to circulate between the coolant inlet and the coolant outlet of the stack 14, thereby cooling the stack 14. Further, a waterway flowmeter 18 is arranged between the water pump 15 and the pile 14, and the waterway flowmeter 18 can measure and calculate the flow of the cooling liquid. In addition, in the present application, the cooling inlet of the electric pile 14 is further provided with a first temperature sensor 16, the cooling liquid outlet of the electric pile 14 is provided with a second temperature sensor 17, and the first temperature sensor 16 and the second temperature sensor 17 can detect the temperatures of the cooling liquid inlet and the cooling liquid outlet for monitoring the temperature condition of the electric pile 14.

In the present application, the water separator 13 is provided with a first electromagnetic valve 12, and the water separator 13 communicates with the second inlet 53 of the humidifier 5 through the first electromagnetic valve 12. By arranging the first electromagnetic valve 12 between the water separator 13 and the second inlet 53, whether the water separator 13 is conducted with the second inlet 53 or not can be controlled by the first electromagnetic valve 12, the first electromagnetic valve 12 can be selectively opened when the temperature or the humidity of the cathode inlet of the electric pile 14 does not meet the working requirement of the electric pile 14, and at the moment, water in the water separator 13 can be introduced into the second inlet 53 and then subjected to wet heat exchange with the first inlet 51, so that the air discharged from the first outlet 52 meets the use requirement.

In the application, the water separator 13 is also provided with a second electromagnetic valve 19, and the water separator 13 is communicated with the tail drain pipe through the second electromagnetic valve 19. The water separator 13 is communicated with the tail drain pipe through the second electromagnetic valve 19, when the temperature and the humidity of air at the cathode inlet of the electric pile 14 meet the reaction requirement, the air state at the cathode inlet of the electric pile 14 is not required to be adjusted at the moment, so that the first electromagnetic valve 12 is closed, and in order to facilitate the water discharge in the water separator 13, the second electromagnetic valve 19 is arranged between the water separator 13 and the tail drain pipe, and the water discharge in the water separator 13 can be completed by controlling the second electromagnetic valve 19 to be communicated at the moment.

The fuel cell system of the present application has a controller 1 (FCU), and the controller 1 can monitor in real time each item of data of the stack 14 to control opening and closing of the first solenoid valve 12 and the second solenoid valve 19. When the temperature and pressure at the cathode inlet of the electric pile 14 meet the normal operation requirement of the electric pile 14, the air state at the cathode inlet of the electric pile 14 does not need to be adjusted at this time, so the controller 1 controls the first electromagnetic valve 12 to maintain the closed state, and controls the second electromagnetic valve 19 to open at regular time to introduce the redundant liquid water in the water separator 13 into the tail drain pipe. When the temperature or pressure at the cathode inlet of the stack 14 does not meet the normal reaction requirements of the stack 14, the controller 1 can control the first solenoid valve 12 to open at this time, and liquid water in the water separator 13 is injected into the second inlet 53 (wet side inlet) of the humidifier 5 to thereby adjust the temperature and humidity of the dry air flowing out from the first outlet 52 (dry side outlet) of the humidifier 5.

In this application, when the first electromagnetic valve 12 is opened, part of hydrogen can be carried out, and when the air compressor 3 stops working, if the first inlet 51 and the second outlet 54 of the humidifier 5 are not plugged, the hydrogen is easy to overflow, and potential safety hazard is generated. According to the humidifier, the third electromagnetic valve 8 and the fourth electromagnetic valve 9 are arranged at the first inlet 51 and the second outlet 54 of the humidifier 5, when the air compressor 3 stops working, the controller 1 controls the third electromagnetic valve 8 and the fourth electromagnetic valve 9 to maintain a closed state, so that hydrogen entering the humidifier 5 cannot overflow and flow into a high-pressure device, and the function of sealing and retaining hydrogen is guaranteed while the safety of the hydrogen is guaranteed.

In this application, be provided with fifth solenoid valve 10 between intercooler 4 and the tail calandria, intercooler 4 and tail calandria intercommunication can bypass partial air flow when fifth solenoid valve 10 opens, prevent to take place surging, can dilute the hydrogen in the tail calandria in addition, prevent that hydrogen emission concentration from being too high from leading to the safety problem.

In the present application, a bypass line is provided between the second inlet 53 and the second outlet 54 of the humidifier 5, and a sixth solenoid valve 11 is provided on the bypass line. When the air humidity at the cathode inlet of the stack 14 is too high, the sixth solenoid valve 11 may be opened at this time so that a portion of the humid air bypasses the humidifier 5, and eventually the flow of humid air into the second inlet 53 of the humidifier 5 is reduced, thereby reducing the moisture transfer between the wet side and the dry side of the humidifier 5, and eventually reducing the air humidity at the cathode inlet of the stack 14.

In order to facilitate monitoring of the operation of the stack 14, a first temperature and pressure sensor 6 is arranged between the first outlet 52 of the humidifier 5 and the cathode inlet of the stack 14, and a second temperature and pressure sensor 7 is arranged between the second inlet 53 of the humidifier 5 and the cathode outlet of the stack 14. The first temperature and pressure sensor 6 is capable of detecting the temperature and pressure of the air at the cathode inlet of the stack 14 and the second temperature and pressure sensor 7 is capable of detecting the temperature and pressure of the air at the cathode outlet of the stack 14. The controller 1 can judge whether the air at the cathode inlet of the electric pile 14 and the cathode outlet of the electric pile 14 meets the normal reaction requirement according to the readings fed back by the first temperature-pressure sensor 6 and the second temperature-pressure sensor 7, and open the first electromagnetic valve 12 to adjust the air state when the working requirement is not met. Further, the air inlet of the air compressor 3 is also provided with a flowmeter 2. By arranging the flowmeter 2 at the inlet of the air compressor 3, the flowmeter 2 can measure and calculate the air flow entering the air compressor 3.

The controller 1 of the fuel cell system can calculate the humidity of the air at the cathode inlet of the electric pile 14 according to the data such as the air flow, the temperature and the pressure of the cathode inlet of the electric pile 14, the temperature and the pressure of the cathode outlet of the electric pile 14, the temperature of the cooling liquid at the cooling liquid inlet and the cooling liquid outlet of the electric pile 14, and control the opening and closing of the first electromagnetic valve 12, the second electromagnetic valve 19 and the sixth electromagnetic valve 11 in real time according to the calculated humidity data so as to adjust the air state at the cathode inlet of the electric pile 14, so that the safety use requirement is met.

The humidity of the air at the cathode inlet of the stack 14 during normal operation of the fuel cell system of the present application needs to satisfy the prescribed ranges RH1 to RH2, and specifically, the control logic of the fuel cell system of the present application is as follows:

when the system is started in normal operation, air at the cathode outlet of the electric pile 14 is introduced into the second inlet 53 of the humidifier 5 and finally discharged from the tail drain, the first electromagnetic valve 12 is kept closed, and the second electromagnetic valve 19 is opened at regular time according to the instruction of the controller 1 so as to periodically discharge liquid water in the water separator 13 to the tail drain.

In the running process of the system, when the controller 1 measures that the humidity at the cathode inlet of the electric pile 14 is smaller than RH1, the controller 1 controls the first electromagnetic valve 12 to be opened, liquid water in the water separator 13 is injected into the second inlet 53 (dry side inlet) of the humidifier 5, so that the moisture transmission from the wet side to the dry side of the humidifier 5 is improved, and the air humidity at the cathode inlet of the electric pile 14 is improved to be gradually larger than RH1; when the controller 1 measures that the humidity at the cathode inlet of the electric pile 14 is larger than RH2, the controller 1 controls the sixth electromagnetic valve 11 to open the bypass part wet side flow so as to reduce the moisture transmission between the wet side and the dry side of the humidifier 5; if the humidity at the cathode inlet of the stack 14 is still higher than RH2 when the sixth electromagnetic valve 11 is fully opened, the controller 1 controls the first electromagnetic valve 12 to be closed and controls the second electromagnetic valve 19 to be opened to inject the water in the water separator 13 into the tail drain pipe; in addition, when the temperature at the cathode inlet of the stack 14 is greater than the threshold value, the controller 1 may also control the first solenoid valve 12 to open the second inlet 53 (wet side inlet) of the humidifier 5 to inject the liquid water in the water separator 13, thereby reducing the dry side temperature of the humidifier 5 by evaporating the heat absorption, and making the air temperature at the cathode inlet of the stack 14 lower than the threshold value.

The foregoing description is only illustrative of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, i.e. all equivalent changes and modifications that may be made in accordance with the present utility model are covered by the appended claims, which are not intended to be construed as limiting.

Claims

1. The utility model provides a fuel cell system, includes electric pile, air compressor machine, intercooler, water knockout drum, humidifier and tail calandria, the humidifier has first entry, first export, second entry and second export, the air compressor machine pass through the intercooler with first entry intercommunication, first export with the negative pole entry intercommunication of electric pile, the negative pole export of electric pile with the second entry intercommunication, air flow in proper order air compressor machine, intercooler, first entry first export the negative pole entry of electric pile, the negative pole export of electric pile, the second entry the follow after the second export tail calandria is discharged, its characterized in that, the positive pole of electric pile with water knockout drum intercommunication, water knockout drum with the second entry intercommunication.

2. The fuel cell system according to claim 1, wherein a first electromagnetic valve is provided on the water separator, and the water separator communicates with the second inlet through the first electromagnetic valve.

3. The fuel cell system according to claim 2, wherein a second electromagnetic valve is provided on the water separator, and the water separator communicates with the tail pipe through the second electromagnetic valve.

4. The fuel cell system according to claim 3, further comprising a controller capable of controlling opening and closing of the first solenoid valve or the second solenoid valve.

5. The fuel cell system according to any one of claims 1 to 4, wherein a third electromagnetic valve is provided at the first inlet, a fourth electromagnetic valve is provided at the second outlet, and the third electromagnetic valve and the fourth electromagnetic valve are closed when the air compressor stops operating.

6. The fuel cell system according to claim 5, wherein a fifth electromagnetic valve is provided between the intercooler and the tail stack.

7. The fuel cell system according to claim 1, wherein a bypass line is provided between the second inlet and the second outlet, and a sixth solenoid valve is provided on the bypass line.

8. The fuel cell system according to claim 5, wherein a first temperature-pressure sensor is provided between the first outlet and the cathode inlet of the stack, and a second temperature-pressure sensor is provided between the second inlet and the cathode outlet of the stack.

9. The fuel cell system according to claim 5, wherein the coolant inlet of the stack is provided with a first temperature sensor, and the coolant outlet of the stack is provided with a second temperature sensor.

10. The fuel cell system according to claim 5, wherein a flow meter is further provided at an air inlet of the air compressor.