Fuel cell engine tail emission control method and system

Abstract

The invention provides a fuel cell engine exhaust control method and system, and the system comprises a fuel cell engine system body which is provided with a water outlet at the bottom and a hydrogen outlet at the side part; the air supply assembly is provided with an auxiliary air outlet pipe and an air compressor exhaust pipe, and the air supply assembly is connected with the fuel cell engine system body; the hydrogen supply assembly is provided with a pressure relief pipeline, and the hydrogen supply assembly is connected with the fuel cell engine system body; the exhaust and drainage connector is connected with a drainage port and a hydrogen discharge port of the fuel cell engine system body, an auxiliary air outlet pipe of the air supply assembly, an air compressor exhaust pipe and a pressure relief pipeline of the hydrogen supply assembly; the cross sectional areas of the inlet and the outlet of the exhaust and drainage joint are larger than those of the intersections where the exhaust and drainage joint is connected with the drainage port and the hydrogen discharge port of the fuel cell engine system body, the auxiliary air outlet pipe of the air supply assembly, the air compressor exhaust pipe and the pressure relief pipeline of the hydrogen supply assembly, and the flow speed is increased when fluid flows through the intersections.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and in particular relates to a fuel cell engine tail exhaust control method and system thereof. Background Art

[0002] With the large-scale promotion and application of fuel cell engines in commercial vehicles, the demand for high-power fuel cell engines is becoming more and more urgent. As the power of fuel cells increases, the requirements for the size and cost of fuel cell engines become more stringent, and at the same time, higher requirements are placed on the reliability and safety of the system.

[0003] The patent application with publication number CN113013444A provides a box air purge method, which uses a three-way valve to control the flow into the box. Due to the large difference in flow between the main air circuit and the purge circuit, it is difficult to control, and there are also problems of complex structure and high cost. A tail exhaust control device for a multi-fuel cell system (CN116598549 A) ​​This patent application adds multiple detection devices and a dedicated exhaust fan to achieve full exhaust of the exhaust gas. The structure is relatively complex, the cost is high, and the reliability is relatively poor.

[0004] In order to ensure sufficient hydrogen discharge and safety of the system, the existing technology has excessive design problems, and multiple sensors are used for monitoring and separate purge fans are arranged. At the same time, complex designs are used to ensure safety and reliability, which increases the complexity of the system structure, production costs, and the difficulty and cost of subsequent maintenance. Summary of the invention

[0005] The present invention provides a fuel cell engine tail exhaust control method and system thereof, which can at least solve technical problems such as system structure complexity, increased production cost, and subsequent maintenance difficulty and cost.

[0006] The technical solution provided by the present invention is as follows: In one aspect, a fuel cell engine tail exhaust control system is provided, the fuel cell engine system comprising: The fuel cell engine system body has a water discharge port at the bottom and a hydrogen discharge port at the side; An air supply assembly having an auxiliary air outlet pipe and an air compressor exhaust pipe, wherein the air supply assembly is connected to the fuel cell engine system body; A hydrogen supply assembly having a pressure relief pipeline, wherein the hydrogen supply assembly is connected to the fuel cell engine system body; An exhaust and drainage joint connected to the drainage port and hydrogen exhaust port of the fuel cell engine system body, the auxiliary air outlet pipe of the air supply assembly, the air compressor exhaust pipe, and the pressure relief pipeline of the hydrogen supply assembly; Among them, the cross-sectional area of ​​the inlet and outlet of the exhaust and drain joint is larger than the cross-sectional area of ​​the intersection where the exhaust and drain joint is connected with the drain port and hydrogen discharge port of the fuel cell engine system body, the auxiliary air outlet pipe of the air supply component, the air compressor exhaust pipe and the pressure relief pipeline of the hydrogen supply component, and the flow velocity of the fluid increases when flowing through the intersection.

[0007] In an optional embodiment, the exhaust and drainage joints include: a drainage port joint, a hydrogen exhaust port joint, an auxiliary air outlet pipe joint, an air compressor exhaust pipe joint, and a hydrogen system exhaust joint; The drain port connector is connected to the drain port of the fuel cell engine system body; The hydrogen exhaust port connector is connected to the hydrogen exhaust port of the fuel cell engine system body; The auxiliary air outlet pipe joint is connected to the auxiliary air outlet pipe of the air supply assembly; The air compressor exhaust pipe joint is connected to the air compressor exhaust pipe of the air supply assembly; The hydrogen system exhaust joint is connected to the pressure relief pipeline of the hydrogen supply assembly.

[0008] In an optional embodiment, the length of the air compressor exhaust pipe joint is shorter than the length of the hydrogen exhaust port joint, the water outlet joint, and the auxiliary air outlet pipe joint; The diameter of the air compressor exhaust pipe joint is larger than the diameters of the hydrogen exhaust port joint, the water outlet joint, and the auxiliary air outlet pipe joint; The lengths of the water drain outlet joint, the auxiliary air outlet pipe joint and the hydrogen system exhaust joint are the same.

[0009] In an optional embodiment, the air supply assembly includes: an air source and an air compressor; The air source is connected to the air compressor, and the air compressor is connected to the air inlet and the purge port of the fuel cell engine system body; The purge port of the air compressor is used to obtain the air humidity and hydrogen concentration in the fuel cell engine system when the fuel cell engine system is initially started, purge the fuel cell engine system through the purge port according to the air humidity and hydrogen concentration in the fuel cell engine system, and inject air into the fuel cell engine system through the air inlet after the purge is completed.

[0010] In an optional embodiment, the air supply assembly further includes: an air outlet pipeline, the inlet of the air outlet pipeline is connected to the air outlet of the fuel cell engine system body, and the outlet is connected to the air compressor.

[0011] In an optional embodiment, the air supply assembly further includes: an air compressor auxiliary air inlet pipeline, the inlet of the air compressor auxiliary air inlet pipeline is arranged on the air outlet pipeline, and the outlet is connected to the air compressor.

[0012] In an optional embodiment, the hydrogen supply assembly includes: a hydrogen source and a hydrogen pump; The hydrogen source is connected to a hydrogen pump, and the hydrogen pump is connected to a hydrogen inlet of the fuel cell engine system body.

[0013] In an optional embodiment, the hydrogen supply assembly further comprises: a water vapor separator, the water vapor separator having a gas inlet, a gas outlet, an exhaust outlet and a drain outlet; The inlet of the water vapor separator is connected to the hydrogen outlet of the fuel cell engine system, the gas outlet is connected to the gas inlet of the hydrogen pump and then merged into the hydrogen inlet of the fuel cell engine system, and the exhaust outlet and the liquid discharge outlet are merged and connected to the exhaust and drainage joint.

[0014] In an optional embodiment, the hydrogen supply assembly further includes: a safety valve, wherein the safety valve is arranged on the pressure relief pipeline, one end of the pressure relief pipeline is connected to the hydrogen pump, and the other end is connected to the exhaust and drainage joint.

[0015] On the other hand, a fuel cell engine tail exhaust control method is provided, the fuel cell engine method comprising: Acquiring air humidity and hydrogen concentration in the fuel cell engine system body; Determining a purge time for the fuel cell engine system body based on the air humidity and hydrogen concentration, and performing the purge; After the purging is completed, air is provided to the fuel cell engine system body through the air supply component, hydrogen is provided to the fuel cell engine system body through the hydrogen supply component, and water vapor generated by the fuel cell engine system body is discharged through the exhaust and drainage joint.

[0016] The fuel cell engine tail exhaust control system provided by the embodiment of the present invention has at least the following beneficial effects: The fuel cell engine tail exhaust control system provided by the embodiment of the present invention realizes timely discharge of hydrogen inside the fuel cell engine to ensure safety by setting a drain port at the bottom of the fuel cell engine system body and a hydrogen discharge port at the side, and at the same time plays a role in discharging other gases and liquid water; air is provided to the fuel cell engine system body through an air supply component, and the cross-sectional area of ​​the inlet and outlet of the exhaust and drain joint is larger than the cross-sectional area of ​​the intersection where the exhaust and drain joint is connected with the drain port and hydrogen discharge port of the fuel cell engine system body, the auxiliary air outlet pipe of the air supply component, the air compressor exhaust pipe and the pressure relief pipeline of the hydrogen supply component. When the fluid flows through the intersection, the flow rate increases, and the outlet of the pipeline with small exhaust or liquid discharge can be negatively pressurized according to the Venturi principle, which is beneficial to the gas discharge of each air compressor exhaust pipe. Prevent the backflow of gas or liquid in special cases where the exhaust pipes of each air compressor have small exhaust or liquid discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present disclosure.

[0018] Figure 1 A schematic diagram of the structure of the fuel cell engine tail exhaust control system is shown.

[0019] Figure 2 A schematic diagram of the exhaust and drainage joint structure is shown.

[0020] Wherein, the accompanying drawings are marked as follows: 1. Fuel cell engine system body, 101. Hydrogen exhaust port, 102. Drain port, 2. Air source, 20. Air compressor, 21. Auxiliary air outlet pipe, 22. Air compressor exhaust pipe, 23. Air outlet pipeline, 24. Air compressor auxiliary air inlet pipeline, 3. Hydrogen source, 31. Hydrogen pump, 32. Water vapor separator, 4. Exhaust and drain joint, 41. Hydrogen exhaust port joint, 42. Drain port joint, 43. Auxiliary air outlet pipe joint, 5. Safety valve. DETAILED DESCRIPTION

[0021] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0022] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0023] See also Figure 1 to Figure 2 An embodiment of the present invention provides a fuel cell engine tail exhaust control system, the fuel cell engine system comprising: a fuel cell engine system body 1, an air supply component, a hydrogen supply component and an exhaust and drainage joint 4.

[0024] Among them, the bottom of the fuel cell engine system body 1 is provided with a drain port 102, and the side is provided with a hydrogen discharge port 101; the air supply component is provided with an auxiliary air outlet pipe 21, an air compressor exhaust pipe 22 and an air inlet pipe, and the air supply component is connected to the fuel cell engine system body 1; the hydrogen supply component is provided with a pressure relief pipeline, and the hydrogen supply component is connected to the fuel cell engine system body 1; the exhaust and drain joint 4 is connected with the drain port 102 and the hydrogen discharge port 101 of the fuel cell engine system body 1, the auxiliary air outlet pipe 21 of the air supply component, the air compressor exhaust pipe 22 and the pressure relief pipeline of the hydrogen supply component.

[0025] Among them, the cross-sectional area of ​​the inlet and outlet of the exhaust and drain connector 4 is larger than the cross-sectional area of ​​the intersection where the exhaust and drain connector 4 is connected with the drain port 102 and the hydrogen discharge port 101 of the fuel cell engine system body 1, the auxiliary air outlet pipe 21 of the air supply component, the air compressor exhaust pipe 22 and the pressure relief pipeline of the hydrogen supply component, and the flow velocity of the fluid increases when it flows through the intersection.

[0026] The fuel cell engine tail exhaust control system provided by the embodiment of the present invention is provided with a drain port 102 at the bottom of the fuel cell engine system body 1 and a hydrogen discharge port 101 at the side, so as to timely discharge hydrogen inside the fuel cell engine to ensure safety, and at the same time discharge other gases and liquid water; the fuel cell engine system body 1 is provided with air through an air supply component, and the cross-sectional area of ​​the inlet and outlet of the exhaust and drainage joint 4 is larger than the cross-sectional area of ​​the intersection where the exhaust and drainage joint 4 is connected with the drain port 102 and the hydrogen discharge port 101 of the fuel cell engine system body 1, the auxiliary air outlet pipe 21 of the air supply component, the air compressor exhaust pipe 22, and the pressure relief pipeline of the hydrogen supply component. When the fluid flows through the intersection, the flow rate increases, and the outlet of the pipeline with small exhaust or liquid discharge can be negatively pressurized according to the Venturi principle, which is beneficial to the gas discharge of each exhaust and drainage pipeline. Prevent the backflow of gas or liquid in the special case where the exhaust or drainage of each exhaust and drainage pipeline is small.

[0027] The fuel cell engine tail exhaust control system provided by the embodiment of the present invention can effectively simplify the structural complexity of the fuel cell engine exhaust system, effectively reduce the system cost, improve the operational reliability and safety, improve the rationality of the system structure layout, and improve the convenience of maintenance. The exhaust structure and control method of the fuel cell engine body with high design controllability, accurate monitoring, and good exhaust and drainage effects can adapt to the reasonable purging and sufficient exhaust and drainage of the fuel cell engine body under different conditions. And by setting the exhaust and drainage joint 4, the exhaust of the air compressor 20 is fully utilized as the power source to achieve rapid and sufficient exhaust of each pipeline, which has the advantages of simplified structure, low cost, and sufficient exhaust.

[0028] There is liquid water, water vapor, air and hydrogen inside the fuel cell engine system body 1. The embodiment of the present invention is provided with dual outlets (water outlet 102 and hydrogen outlet 101) of the fuel cell engine system body 1. The water outlet 102 is mainly used to discharge the liquid water inside the fuel cell engine system body 1 in time to ensure internal insulation, and at the same time, it plays a role in discharging other gases. The hydrogen outlet 101 is provided on the upper side (side) of the fuel cell engine system body 1 to discharge the hydrogen inside the fuel cell engine system body 1 in time to ensure system safety, and at the same time, it plays a role in discharging other gases and liquid water.

[0029] The fuel cell engine system body 1 provided in the embodiment of the present invention further includes a hydrogen concentration sensor, which is arranged between the hydrogen exhaust port 101 of the fuel cell engine system body 1 and the exhaust and drainage joint 4 .

[0030] Since the hydrogen concentration is highest on the upper side of the fuel cell engine system body 1 and the gas at the hydrogen outlet is fluid, a hydrogen concentration sensor is provided at the hydrogen outlet of the fuel cell engine system body 1 to accurately detect the hydrogen concentration of the fuel cell engine system body 1 and ensure the safety of the fuel cell engine tail exhaust control system. When the hydrogen concentration at the hydrogen outlet 101 exceeds the limit, the purge flow rate is increased to reduce the hydrogen concentration to a safe range in time.

[0031] In an optional embodiment, the exhaust and drain connector 4 includes: a drain port connector 42, a hydrogen exhaust port connector 41, an auxiliary air outlet pipe connector 43, an air compressor exhaust pipe connector and a hydrogen system exhaust connector; the drain port connector 42 is connected to the drain port 102 of the fuel cell engine system body 1; the hydrogen exhaust port connector 41 is connected to the hydrogen exhaust port 101 of the fuel cell engine system body 1; the auxiliary air outlet pipe connector 43 is connected to the auxiliary air outlet pipe 21 of the air supply assembly; the air compressor exhaust pipe connector is connected to the air compressor exhaust pipe 22 of the air supply assembly; the hydrogen system exhaust connector is connected to the pressure relief pipeline of the hydrogen supply assembly.

[0032] In the embodiment of the present invention, an air compressor exhaust pipe joint is provided, and the auxiliary air outlet pipe 21 of the air supply assembly is connected to the auxiliary air outlet pipe joint 43. High-speed air enters the exhaust and drainage joint 4 and mixes with the hydrogen in the hydrogen discharge port 101 and the box drainage port 102 of the fuel cell engine system body 1 to effectively reduce the overall hydrogen concentration and quickly discharge the mixed gas.

[0033] In an optional embodiment, the length of the drain port joint 42 and the auxiliary air outlet pipe joint 43 is less than the length of the hydrogen outlet joint 41; this can effectively prevent hydrogen backflow, is safe, and has a simple structure. The diameter of the air compressor exhaust pipe joint is larger than the diameter of the hydrogen outlet joint 41, the drain port joint 42, and the auxiliary air outlet pipe joint 43; the lengths of the drain port joint 42, the auxiliary air outlet pipe joint 43 and the hydrogen system exhaust joint are the same. As an example, the diameter of the air compressor exhaust pipe joint can be 60 mm.

[0034] It should be noted that the hydrogen exhaust pipeline, the water drain pipeline and the auxiliary air outlet pipeline respectively connected to the hydrogen exhaust port joint 41, the water drain port joint 42 and the auxiliary air outlet pipe joint 43 provided in the embodiment of the present invention can be merged in advance at a preset distance before the exhaust and drain joint 4, and then connected to the corresponding joints in the exhaust and drain joint 4 after merging, so as to reduce the pressure of the exhaust and drain joint 4.

[0035] By setting the length of the air compressor exhaust pipe joint to be greater than the length of the drain outlet joint 42, the auxiliary air outlet joint 43 and the hydrogen system exhaust joint, the flow rate of the gas or liquid increases sharply when passing through the intersection, and the negative pressure is achieved at the joint outlet with a small exhaust or liquid discharge according to the Venturi principle, which is conducive to the discharge of gas or liquid from each air compressor exhaust pipe 22. To prevent the backflow of the joint with a small exhaust or liquid discharge, the hydrogen outlet joint 41 with a high hydrogen discharge volume is extended from the air compressor exhaust pipe joint, and is separated from other interfaces and closer to the atmospheric environment, so that the hydrogen in the fuel cell engine system body 1 can be discharged quickly.

[0036] In an optional embodiment, the air supply assembly includes: an air source 2 and an air compressor 20; the air source 2 is connected to the air compressor 20, and the air compressor 20 is connected to the air inlet and the purge port of the fuel cell engine system body 1; the purge port of the air compressor 20 is used to obtain the residual liquid amount in the fuel cell engine system when the fuel cell engine system is initially started; the fuel cell engine system is purged through the purge port according to the residual liquid amount in the fuel cell engine system, and the air inlet is used to inject air into the fuel cell engine system through the air inlet after the purge is completed.

[0037] In the embodiment of the present invention, the air output by the air compressor 20 enters the fuel cell engine system body 1 through the purge pipe, wherein a throttle valve is provided on the purge pipe to adjust the air input amount.

[0038] The embodiment of the present invention uses a large amount of air to inject into the fuel cell engine system body 1 when the fuel cell engine tail exhaust control system is initially started, so as to dry the liquid water generated during the last operation of the fuel cell engine system and discharge the residual hydrogen in the fuel cell engine system body 1, thereby effectively improving the insulation resistance of the fuel cell stack to the ground and reducing the hydrogen concentration in the fuel cell engine system body 1, thereby providing reliable guarantee for the start-up of the fuel cell engine tail exhaust control system. At the same time, the demand for a large air volume in the fuel cell engine system body 1 will have a certain alleviating effect on the surging problem of the air compressor 20 caused by the high cathode resistance in the initial operation of the fuel cell engine tail exhaust control system, and can increase the life of components.

[0039] After the fuel cell engine tail exhaust control system is normally started (after starting to work), it controls the air input of a lower flow rate inside the fuel cell engine system body 1, reducing the power consumption of this part while ensuring that the fuel cell engine system body 1 has a stable stack operating environment.

[0040] When the fuel cell engine tail exhaust control system stops running, the air flow input is increased to dry the stack and the inner surface of the box and discharge the hydrogen and water vapor inside the fuel cell engine system body 1 to protect the safety of the stack and provide guarantee for the next startup of the fuel cell engine tail exhaust control system.

[0041] In an optional embodiment, the air supply assembly further includes: an air outlet pipeline 23 , the inlet of the air outlet pipeline 23 is connected to the air outlet of the fuel cell engine system body 1 , and the outlet is connected to the air compressor 20 .

[0042] Excess air in the fuel cell engine system body 1 can be reintroduced into the air compressor 20 through the air outlet pipeline 23 for circulation.

[0043] Furthermore, the air content in the fuel cell engine system body 1 can be obtained in real time. When the air content in the fuel cell engine system body 1 is greater than a preset content, the control valve on the air outlet pipeline 23 is opened to realize air circulation through the air outlet pipeline 23.

[0044] In an optional embodiment, the air supply assembly further includes: an air compressor auxiliary air inlet pipeline 24 , the inlet of the air compressor auxiliary air inlet pipeline 24 is arranged on the air outlet pipeline 23 , and the outlet is connected to the air compressor 20 .

[0045] By setting up the air compressor auxiliary air inlet pipeline 24, the auxiliary air inlet pipeline can be opened according to the air content in the fuel cell engine system body 1 to intercept the air that is about to enter the fuel cell engine system body 1, thereby preventing excessive air from entering and affecting the operation of the fuel cell engine system body 1.

[0046] In an optional embodiment, the hydrogen supply assembly includes: a hydrogen source 3 and a hydrogen pump 31 ; the hydrogen source 3 is connected to the hydrogen pump 31 , and the hydrogen pump 31 is connected to the hydrogen inlet of the fuel cell engine system body 1 .

[0047] In an optional embodiment, the hydrogen supply assembly also includes: a water vapor separator 32, the water vapor separator 32 has an inlet, a gas outlet, an exhaust outlet and a liquid discharge outlet; the inlet of the water vapor separator 32 is connected to the hydrogen outlet of the fuel cell engine system, the gas outlet is connected to the hydrogen inlet of the fuel cell engine system, and the exhaust outlet and the liquid discharge outlet are connected to the exhaust and drain connector 4 after being combined.

[0048] In an optional embodiment, the hydrogen supply assembly further includes: a safety valve 5 , which is arranged on a pressure relief pipeline, one end of which is connected to the hydrogen pump 31 , and the other end of which is connected to the exhaust and drainage connector 4 .

[0049] The pressure relief pipeline is used to relieve the pressure and exhaust gas for protection when the pressure of new hydrogen is too high. The exhaust outlet and the liquid discharge outlet of the water vapor separator 32 are used to exhaust gas for hydrogen reuse during the operation of the fuel cell engine tail exhaust control system.

[0050] When the pressure of the new hydrogen input exceeds the preset pressure, the hydrogen pump pressure relief valve set on the pressure relief pipeline is fully opened, allowing hydrogen to reach the drain and exhaust joint through the pressure relief pipeline. During the pressure relief process, the exhaust outlet and the drain outlet of the water vapor separator 32 are completely closed and prohibited from opening, ensuring that hydrogen only enters the exhaust outlet and the drain outlet. When the fuel cell engine tail exhaust control system works normally, the hydrogen pump pressure relief valve on the pressure relief pipeline is in a completely closed state.

[0051] The exhaust valve at the exhaust outlet and the drain valve at the drain outlet of the water vapor separator 32 are set to the same switching frequency and cycle, and are opened alternately. Under this condition, only one of the three outlets will be exhausted without overlapping, so as to ensure smooth exhaust.

[0052] See also Figure 2 The auxiliary air outlet pipe 21, the air compressor exhaust pipe 22 and the hydrogen system exhaust pipe provided in the embodiment of the present invention are arranged in parallel.

[0053] On the other hand, a fuel cell engine tail exhaust control method is provided, the fuel cell engine method comprising: Obtaining air humidity and hydrogen concentration in the fuel cell engine system body 1; Determine the purge time for the fuel cell engine system body 1 based on the air humidity and hydrogen concentration, and perform the purge; After the purging is completed, air is provided to the fuel cell engine system body 1 through the air supply component, hydrogen is provided to the fuel cell engine system body 1 through the hydrogen supply component, and water vapor generated by the fuel cell engine system body 1 is discharged through the exhaust and drainage joint 4.

[0054] Air humidity can be obtained by a hygrometer, and hydrogen concentration can be obtained by a hydrogen content detector.

[0055] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A fuel cell engine tail exhaust control system, characterized in that: The fuel cell engine tail exhaust control system comprises: The fuel cell engine system body has a water discharge port at the bottom and a hydrogen discharge port at the side; An air supply assembly having an auxiliary air outlet pipe and an air compressor exhaust pipe, wherein the air supply assembly is connected to the fuel cell engine system body; A hydrogen supply assembly having a pressure relief pipeline, wherein the hydrogen supply assembly is connected to the fuel cell engine system body; An exhaust and drainage joint connected to the drainage port and hydrogen exhaust port of the fuel cell engine system body, the auxiliary air outlet pipe of the air supply assembly, the air compressor exhaust pipe, and the pressure relief pipeline of the hydrogen supply assembly; Among them, the cross-sectional area of ​​the inlet and outlet of the exhaust and drain joint is larger than the cross-sectional area of ​​the intersection where the exhaust and drain joint is connected with the drain port and hydrogen discharge port of the fuel cell engine system body, the auxiliary air outlet pipe of the air supply component, the air compressor exhaust pipe and the pressure relief pipeline of the hydrogen supply component, and the flow velocity of the fluid increases when flowing through the intersection.

2. The fuel cell engine tail exhaust control system according to claim 1, characterized in that: The exhaust and drainage joints include: a drainage port joint, a hydrogen exhaust port joint, an auxiliary air outlet pipe joint, an air compressor exhaust pipe joint, and a hydrogen system exhaust joint; The drain port connector is connected to the drain port of the fuel cell engine system body; The hydrogen exhaust port connector is connected to the hydrogen exhaust port of the fuel cell engine system body; The auxiliary air outlet pipe joint is connected to the auxiliary air outlet pipe of the air supply assembly; The air compressor exhaust pipe joint is connected to the air compressor exhaust pipe of the air supply assembly; The hydrogen system exhaust joint is connected to the pressure relief pipeline of the hydrogen supply assembly.

3. The fuel cell engine tail exhaust control system according to claim 2, characterized in that: The lengths of the water outlet joint and the auxiliary air outlet pipe joint are shorter than the length of the hydrogen outlet joint; The diameter of the air compressor exhaust pipe joint is larger than the diameters of the hydrogen exhaust port joint, the water outlet joint, and the auxiliary air outlet pipe joint; The lengths of the water drain outlet joint, the auxiliary air outlet pipe joint and the hydrogen system exhaust joint are the same.

4. The fuel cell engine tail exhaust control system according to claim 1, characterized in that: The air supply assembly includes: an air source and an air compressor; The air source is connected to the air compressor, and the air compressor is connected to the air inlet and the purge port of the fuel cell engine system body; The purge port of the air compressor is used to obtain the air humidity and hydrogen concentration in the fuel cell engine system when the fuel cell engine system is initially started, purge the fuel cell engine system through the purge port according to the air humidity and hydrogen concentration in the fuel cell engine system, and inject air into the fuel cell engine system through the air inlet after the purge is completed.

5. The fuel cell engine tail exhaust control system according to claim 4, characterized in that: The air supply assembly further includes an air outlet pipeline, the inlet of which is connected to the air outlet of the fuel cell engine system body, and the outlet of which is connected to the air compressor.

6. The fuel cell engine tail exhaust control system according to claim 5, characterized in that: The air supply assembly also includes: an air compressor auxiliary air inlet pipeline, the inlet of the air compressor auxiliary air inlet pipeline is arranged on the air outlet pipeline, and the outlet is connected to the air compressor.

7. The fuel cell engine tail exhaust control system according to claim 1, characterized in that: The hydrogen supply assembly comprises: a hydrogen source and a hydrogen pump; The hydrogen source is connected to a hydrogen pump, and the hydrogen pump is connected to a hydrogen inlet of the fuel cell engine system body.

8. The fuel cell engine tail exhaust control system according to claim 7, characterized in that: The hydrogen supply assembly further comprises: a water vapor separator having a gas inlet, a gas outlet, an exhaust outlet and a liquid discharge outlet; The inlet of the water vapor separator is connected to the hydrogen outlet of the fuel cell engine system, the gas outlet is connected to the gas inlet of the hydrogen pump and then merged into the hydrogen inlet of the fuel cell engine system, and the exhaust outlet and the liquid discharge outlet are merged and connected to the exhaust and drainage joint.

9. The fuel cell engine tail exhaust control system according to claim 7, characterized in that: The hydrogen supply assembly further includes a safety valve, which is arranged on the pressure relief pipeline. One end of the pressure relief pipeline is connected to the hydrogen pump, and the other end is connected to the exhaust and drainage joint.

10. A fuel cell engine tail exhaust control method, characterized in that: The fuel cell engine method comprises: Acquiring air humidity and hydrogen concentration in the fuel cell engine system body; Determining a purge time for the fuel cell engine system body based on the air humidity and hydrogen concentration, and performing the purge; After the purging is completed, air is provided to the fuel cell engine system body through the air supply component, hydrogen is provided to the fuel cell engine system body through the hydrogen supply component, and water vapor generated by the fuel cell engine system body is discharged through the exhaust and drainage joint.

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