A fuel cell engine tailpipe control method and system

Abstract

The application provides a fuel cell engine tail exhaust control method and system, which comprises a fuel cell engine system body, a bottom of which is provided with a water outlet, and a side of which is provided with a hydrogen outlet; an air supply assembly, which is provided with an auxiliary air outlet pipe and an air compressor exhaust pipe, and is connected with the fuel cell engine system body; a hydrogen supply assembly, which is provided with a pressure relief pipeline, and is connected with the fuel cell engine system body; and an exhaust and water outlet joint, which is connected with the water outlet and the hydrogen outlet of the fuel cell engine system body, the auxiliary air outlet pipe and the air compressor exhaust pipe of the air supply assembly, and the pressure relief pipeline of the hydrogen supply assembly; and the cross-sectional area of the inlet and the outlet of the exhaust and water outlet joint is larger than that of the intersection of the exhaust and water outlet joint and the water outlet and the hydrogen outlet of the fuel cell engine system body, the auxiliary air outlet pipe and the air compressor exhaust pipe of the air supply assembly, and the pressure relief pipeline of the hydrogen supply assembly, so that the flow rate of fluid increases when the fluid flows through the intersection.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a fuel cell engine tail exhaust control method and system. BACKGROUND

[0002] With the large-scale popularization and application of fuel cell engines on commercial vehicles, the demand for high-power fuel cell engines is becoming more and more urgent. With the increase of fuel cell power, the requirements for the size and cost of the fuel cell engine are also more stringent, and the reliability and safety of the system have also been higher.

[0003] Patent application with publication number CN113013444A provides a box purging air mode, which adopts a three-way valve mode to control the flow into the box. Since the flow difference between the air main loop and the purging loop is large, the control is difficult, and there are problems of complex structure and high cost. A tail exhaust control device for a multi-fuel cell system (CN116598549 A) increases multiple detection devices and a special exhaust fan to realize sufficient exhaust of tail gas, and the structure is relatively complex, the cost is relatively high, and the reliability is relatively poor.

[0004] The prior art has the problem of excessive design to ensure the safety of the system. Multiple sensors are monitored and a separate purging fan is arranged to ensure safety and reliability, which increases the complexity of the system structure, the production cost, and the difficulty and cost of later maintenance. SUMMARY

[0005] The application provides a fuel cell engine tail exhaust control method and system, which can at least solve the technical problems of system structure complexity, high production cost, and high difficulty and cost of later maintenance.

[0006] The technical scheme provided by the application is as follows:

[0007] On the one hand, a fuel cell engine tail exhaust control system is provided, and the fuel cell engine system comprises:

[0008] The fuel cell engine system body has a drain port at the bottom and a hydrogen exhaust port at the side;

[0009] The air supply assembly has an auxiliary air outlet pipe and an air compressor exhaust pipe, and is connected with the fuel cell engine system body;

[0010] The hydrogen supply assembly has a pressure relief pipeline, and is connected with the fuel cell engine system body;

[0011] An exhaust and drain joint is connected with a drain port and a hydrogen outlet of the fuel cell engine system body, an auxiliary air outlet pipe and an air compressor exhaust pipe of the air supply assembly, and a pressure relief pipeline of the hydrogen supply assembly;

[0012] The cross-sectional area of the inlet and outlet of the exhaust and drain joint is greater than that of the intersection of the exhaust and drain joint and the drain port and the hydrogen outlet of the fuel cell engine system body, the auxiliary air outlet pipe and the air compressor exhaust pipe of the air supply assembly, and the pressure relief pipeline of the hydrogen supply assembly, so that the fluid flow rate increases when passing through the intersection.

[0013] In an alternative embodiment, the exhaust and drain joint comprises a drain port joint, a hydrogen outlet joint, an auxiliary air outlet pipe joint, an air compressor exhaust pipe joint, and a hydrogen system exhaust joint.

[0014] The drain port joint is connected with the drain port of the fuel cell engine system body.

[0015] The hydrogen outlet joint is connected with the hydrogen outlet of the fuel cell engine system body.

[0016] The auxiliary air outlet pipe joint is connected with the auxiliary air outlet pipe of the air supply assembly.

[0017] The air compressor exhaust pipe joint is connected with the air compressor exhaust pipe of the air supply assembly.

[0018] The hydrogen system exhaust joint is connected with the pressure relief pipeline of the hydrogen supply assembly.

[0019] In an alternative embodiment, the length of the air compressor exhaust pipe joint is less than that of the hydrogen outlet joint, the drain port joint, and the auxiliary air outlet pipe joint.

[0020] The diameter of the air compressor exhaust pipe joint is greater than that of the hydrogen outlet joint, the drain port joint, and the auxiliary air outlet pipe joint.

[0021] The lengths of the drain port joint, the auxiliary air outlet pipe joint, and the hydrogen system exhaust joint are the same.

[0022] In an alternative embodiment, the air supply assembly comprises an air source and an air compressor.

[0023] The air source is connected with the air compressor, and the air compressor is connected with an air inlet and a purge port of the fuel cell engine system body.

[0024] The purge port of the air compressor is used to obtain the air humidity and hydrogen concentration in the fuel cell engine system during the initial start of the fuel cell engine system, and the fuel cell engine system is purged through the purge port according to the air humidity and hydrogen concentration in the fuel cell engine system, and air is injected into the fuel cell engine system through the air inlet after the purge is completed.

[0025] In an alternative embodiment, the air supply assembly further comprises: an air outlet pipeline, the inlet of the air outlet pipeline is connected with the air outlet of the fuel cell engine system body, and the outlet is connected with the air compressor.

[0026] In an alternative embodiment, the air supply assembly further comprises: 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 with the air compressor.

[0027] In an alternative embodiment, the hydrogen supply assembly comprises: a hydrogen source and a hydrogen pump;

[0028] The hydrogen source is connected with the hydrogen pump, and the hydrogen pump is connected with the hydrogen inlet of the fuel cell engine system body.

[0029] In an alternative embodiment, the hydrogen supply assembly further comprises: a water vapor separator, the water vapor separator has a gas inlet, a gas outlet, an exhaust outlet and a liquid outlet;

[0030] The inlet of the water vapor separator is connected with the hydrogen outlet of the fuel cell engine system, the gas outlet is connected with the gas inlet of the hydrogen pump, and then the hydrogen inlet of the fuel cell engine system is connected, the exhaust outlet and the liquid outlet are connected with the exhaust and drainage joint after being collected.

[0031] In an alternative embodiment, the hydrogen supply assembly further comprises: a safety valve, the safety valve is arranged on the pressure relief pipeline, one end of the pressure relief pipeline is connected with the hydrogen pump, and the other end is connected with the exhaust and drainage joint.

[0032] On the other hand, a fuel cell engine tail exhaust control method is provided, the fuel cell engine method comprises:

[0033] Obtaining the air humidity and hydrogen concentration in the fuel cell engine system body;

[0034] Determining the purging time of the fuel cell engine system body based on the air humidity and hydrogen concentration, and purging;

[0035] After purging, the fuel cell engine system body is supplied with air by the air supply assembly, supplied with hydrogen by the hydrogen supply assembly, and the water vapor generated by the fuel cell engine system body is discharged through the exhaust and water drain joint.

[0036] The fuel cell engine tail exhaust control system provided by the embodiment of the present application has at least the following beneficial effects:

[0037] The fuel cell engine tail exhaust control system provided by the embodiment of the present application has at least the following beneficial effects: The fuel cell engine tail exhaust control system provided by the embodiment of the present application has at least the following beneficial effects: The fuel cell engine tail exhaust control system provided by the embodiment of the present application has at least the following beneficial effects:

[0038] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which like reference characters refer to like parts throughout the figures, and wherein:

[0039] Fig. 1 The structure of the fuel cell engine tail exhaust control system is shown.

[0040] Fig. 2 The structure of the exhaust and water drain joint is shown.

[0041] In the drawings, the same reference numbers refer to the same components throughout the drawings.

[0042] 1. fuel cell engine system body, 101. hydrogen discharge port, 102. water discharge port, 2. air source, 20. air compressor, 21. auxiliary air outlet pipe, 22. air compressor exhaust pipe, 23. air outlet pipe line, 24. air compressor auxiliary air inlet pipe line, 3. hydrogen source, 31. hydrogen pump, 32. water vapor separator, 4. exhaust and water drain joint, 41. hydrogen discharge port joint, 42. water discharge port joint, 43. auxiliary air outlet pipe joint, 5. safety valve. DETAILED DESCRIPTION

[0043] Embodiments of the present disclosure will be described below in greater detail with reference to the accompanying drawings. While embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0044] The term "comprising" and variations thereof as used herein are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to those elements, but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an overly literal or overly formal sense unless expressly so defined herein.

[0045] See Figs. 1-2 The embodiments of the present disclosure provide a fuel cell engine tail exhaust control system, which comprises a fuel cell engine system body 1, an air supply assembly, a hydrogen supply assembly, and an exhaust and drainage joint 4.

[0046] The bottom of the fuel cell engine system body 1 has a drainage port 102, and the side has a hydrogen discharge port 101; the air supply assembly has an auxiliary air outlet pipe 21, an air compressor exhaust pipe 22, and an air inlet pipe, and is connected to the fuel cell engine system body 1; the hydrogen supply assembly has a pressure relief pipe, and is connected to the fuel cell engine system body 1; the exhaust and drainage joint 4 is connected to the drainage port 102 and the hydrogen discharge port 101 of the fuel cell engine system body 1, the auxiliary air outlet pipe 21 and the air compressor exhaust pipe 22 of the air supply assembly, and the pressure relief pipe of the hydrogen supply assembly.

[0047] The cross-sectional area of the inlet and outlet of the exhaust and drainage joint 4 is greater than the cross-sectional area of the intersection where the exhaust and drainage joint 4 is connected to the drainage port 102 and the hydrogen discharge port 101 of the fuel cell engine system body 1, the auxiliary air outlet pipe 21 and the air compressor exhaust pipe 22 of the air supply assembly, and the pressure relief pipe of the hydrogen supply assembly, and the flow rate increases when fluid flows through the intersection.

[0048] The fuel cell engine tail exhaust control system provided by the embodiment of the present application achieves timely discharge of hydrogen in the fuel cell engine to ensure safety, and simultaneously achieves discharge of other gases and liquid water by arranging a drain port 102 at the bottom of the fuel cell engine system body 1 and arranging a hydrogen discharge port 101 at the side of the fuel cell engine system body 1; the air supply assembly provides air for the fuel cell engine system body 1, the cross-sectional area of the intersection of the auxiliary air outlet pipe 21 of the air supply assembly, the air compressor exhaust pipe 22 and the pressure relief pipe connected with the hydrogen supply assembly is greater than the cross-sectional area of the inlet and outlet of the exhaust and drain connector 4 and the cross-sectional area of the drain port 102 and the hydrogen discharge port 101 of the fuel cell engine system body 1, the flow rate of fluid increases when the fluid flows through the intersection, the outlet of the small pipeline for exhaust or liquid discharge is under negative pressure according to the Venturi principle, and the gas in each exhaust and drain pipeline is discharged.

[0049] The fuel cell engine tail exhaust control system provided by the embodiment of the present application can effectively simplify the structural complexity of the exhaust system of the fuel cell engine, effectively reduce the system cost, improve the operation reliability and safety, improve the rationality of the system structure arrangement, and improve the maintenance convenience. The exhaust structure and control method of the fuel cell engine body with high controllability, accurate monitoring, good exhaust and drain effect can adapt to reasonable purging and sufficient exhaust and drain of the fuel cell engine body under different conditions. And by arranging the exhaust and drain connector 4, the exhaust of the air compressor 20 is used as a power source to realize rapid and sufficient exhaust of each pipeline, and the fuel cell engine tail exhaust control system has the advantages of simplified structure, low cost and sufficient exhaust.

[0050] There are liquid water, water vapor, air and hydrogen in the fuel cell engine system body 1, the fuel cell engine system body 1 is provided with double outlets (the drain port 102 and the hydrogen discharge port 101), the drain port 102 mainly achieves timely discharge of liquid water in the fuel cell engine system body 1 to ensure internal insulation, and simultaneously achieves discharge of other gases. The hydrogen discharge port 101 is arranged at the upper side (the side) of the fuel cell engine system body 1, and achieves timely discharge of hydrogen in the fuel cell engine system body 1 to ensure system safety, and simultaneously achieves discharge of other gases and liquid water.

[0051] The fuel cell engine system body 1 provided by the embodiment of the present application further comprises a hydrogen concentration sensor, which is arranged between the hydrogen discharge port 101 of the fuel cell engine system body 1 and the exhaust and drain connector 4.

[0052] The hydrogen concentration sensor is arranged at the hydrogen outlet position of the fuel cell engine system body 1, so that the hydrogen concentration of the fuel cell engine system body 1 can be accurately detected, and the safety of the fuel cell engine tail exhaust control system is ensured. When the hydrogen concentration of the hydrogen exhaust port 101 exceeds the limit, the purge flow is increased to timely reduce the hydrogen concentration to the safe range.

[0053] In an alternative embodiment, the exhaust and drainage joint 4 comprises a drainage port joint 42, a hydrogen exhaust port joint 41, an auxiliary air outlet pipe joint 43, an air compressor exhaust pipe joint and a hydrogen system exhaust joint; the drainage port joint 42 is connected with the drainage port 102 of the fuel cell engine system body 1; the hydrogen exhaust port joint 41 is connected with the hydrogen exhaust port 101 of the fuel cell engine system body 1; the auxiliary air outlet pipe joint 43 is connected with the auxiliary air outlet pipe 21 of the air supply assembly; the air compressor exhaust pipe joint is connected with the air compressor exhaust pipe 22 of the air supply assembly; and the hydrogen system exhaust joint is connected with the pressure relief pipeline of the hydrogen supply assembly.

[0054] In the embodiment of the present application, the air compressor exhaust pipe joint is arranged, the auxiliary air outlet pipe 21 of the air supply assembly is connected with the auxiliary air outlet pipe joint 43, high-speed air enters the exhaust and drainage joint 4, mixes with hydrogen in the hydrogen exhaust port 101 and the drainage port 102 of the fuel cell engine system body 1, effectively reduces the overall hydrogen concentration, and makes the mixed gas quickly discharged.

[0055] In an alternative embodiment, the lengths of the drainage port joint 42 and the auxiliary air outlet pipe joint 43 are less than the length of the hydrogen exhaust port joint 41; in this way, hydrogen backflow can be effectively prevented, which is safe and simple in structure. The diameter of the air compressor exhaust pipe joint is greater than the diameters of the hydrogen exhaust port joint 41, the drainage port joint 42 and the auxiliary air outlet pipe joint 43; the lengths of the drainage 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.

[0056] It should be noted that the hydrogen exhaust pipe, the drainage pipe and the auxiliary air outlet pipe connected with the hydrogen exhaust port joint 41, the drainage port joint 42 and the auxiliary air outlet pipe joint 43 respectively provided in the embodiment of the present application can be combined at a preset distance before the exhaust and drainage joint 4, and then connected with the corresponding joint in the exhaust and drainage joint 4, so as to reduce the pressure of the exhaust and drainage joint 4.

[0057] By setting the length of the air compressor exhaust pipe joint to be greater than the length of the drain port joint 42, the auxiliary air outlet pipe joint 43, and the hydrogen system exhaust joint, the flow rate of the gas or liquid flowing through the intersection is sharply increased, and according to the Venturi principle, the outlet of the joint with small exhaust or drainage volume is under negative pressure, which is beneficial to the discharge of the gas or liquid from the air compressor exhaust pipe 22. The backflow of the joint with small exhaust or drainage volume is prevented, the hydrogen exhaust port joint 41 with high hydrogen exhaust volume is lengthened and spaced apart from other interfaces, and is closer to the atmospheric environment, so that the hydrogen in the fuel cell engine system body 1 can be quickly discharged.

[0058] In an alternative embodiment, the air supply assembly comprises: 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 amount of liquid residue 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 amount of liquid residue 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 purging is completed.

[0059] In the embodiment of the application, the air output by the air compressor 20 enters the fuel cell engine system body 1 through the purge pipe, and a throttle valve is arranged on the purge pipe to adjust the air input amount.

[0060] In the embodiment of the application, a large amount of air is injected into the fuel cell engine system body 1 when the fuel cell engine tail gas control system is initially started, the liquid water generated during the last operation of the fuel cell engine system is blown dry, and the residual hydrogen in the fuel cell engine system body 1 is discharged, which effectively improves the insulation resistance of the stack to the ground, reduces the hydrogen concentration in the fuel cell engine system body 1, and provides reliable protection for the start of the fuel cell engine tail gas control system. At the same time, the demand for a large amount of air in the fuel cell engine system body 1 can alleviate the air compressor 20 surge problem caused by high resistance in the cathode at the initial stage of the operation of the fuel cell engine tail gas control system, and can increase the service life of the parts.

[0061] After the fuel cell engine tail gas control system is normally started (after starting), the air input in the fuel cell engine system body 1 is controlled to be low, which reduces the power consumption of this part while ensuring a stable stack operating environment in the fuel cell engine system body 1.

[0062] The air supply assembly increases the air flow input during the shutdown process of the fuel cell engine tail exhaust control system, blows dry the inner surface of the fuel cell engine system body 1, and discharges hydrogen and water vapor in the fuel cell engine system body 1, thereby protecting the safety of the fuel cell engine system body 1 and providing protection for the next start of the fuel cell engine tail exhaust control system.

[0063] In an optional embodiment, the air supply assembly further comprises an air outlet pipeline 23, the inlet of the air outlet pipeline 23 is connected with the air outlet of the fuel cell engine system body 1, and the outlet is connected with the air compressor 20.

[0064] The excess air in the fuel cell engine system body 1 can be introduced into the air compressor 20 for circulation through the air outlet pipeline 23.

[0065] Further, the content of the air in the fuel cell engine system body 1 can be obtained in real time, and when the content of the air in the fuel cell engine system body 1 is greater than a preset content, a control valve on the air outlet pipeline 23 is opened to realize circulation of the air through the air outlet pipeline 23.

[0066] In an optional embodiment, the air supply assembly further comprises 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 with the air compressor 20.

[0067] By arranging the air compressor auxiliary air inlet pipeline 24, the auxiliary air inlet pipeline can be selectively opened according to the content of the air in the fuel cell engine system body 1 to intercept the air about to enter the fuel cell engine system body 1, so as to avoid too much air from entering and affecting the operation of the fuel cell engine system body 1.

[0068] In an optional embodiment, the hydrogen supply assembly comprises a hydrogen source 3 and a hydrogen pump 31; the hydrogen source 3 is connected with the hydrogen pump 31, and the hydrogen pump 31 is connected with the hydrogen inlet of the fuel cell engine system body 1.

[0069] In an optional embodiment, the hydrogen supply assembly further comprises a water vapor separator 32, the water vapor separator 32 has an inlet, a gas outlet, an exhaust outlet, and a liquid outlet; the inlet of the water vapor separator 32 is connected with the hydrogen outlet of the fuel cell engine system, the gas outlet is connected with the hydrogen inlet of the fuel cell engine system, and the exhaust outlet and the liquid outlet are connected with the exhaust and drainage joint 4 after being collected.

[0070] In an optional embodiment, the hydrogen supply assembly further comprises a safety valve 5, the safety valve 5 is arranged on a pressure relief pipeline, one end of the pressure relief pipeline is connected with the hydrogen pump 31, and the other end is connected with the exhaust and drainage joint 4.

[0071] The pressure relief pipeline is used to relieve the pressure when the new hydrogen pressure is too high. The exhaust outlet and the liquid outlet of the water vapor separator 32 are used to exhaust the hydrogen for reuse.

[0072] When the input new hydrogen pressure exceeds the preset pressure, the hydrogen pump pressure relief valve on the pressure relief pipeline is fully opened, so that the hydrogen gas passes through the pressure relief pipeline to the water and exhaust joint. During the pressure relief process, the exhaust outlet and the liquid outlet of the water vapor separator 32 are fully closed and prohibited to be opened, so as to ensure that the hydrogen gas only enters the exhaust outlet and the liquid outlet. When the fuel cell engine exhaust control system is normally working, the hydrogen pump pressure relief valve on the pressure relief pipeline is in a fully closed state.

[0073] The exhaust valve of the exhaust outlet and the liquid valve of the liquid outlet of the water vapor separator 32 are set to have the same switching frequency and period, and are alternately opened. Under this condition, only one of the three outlets is used for exhaust, and there is no overlap, so as to ensure smooth exhaust.

[0074] Please refer to Fig. 2 The auxiliary air outlet pipe 21, the air compressor exhaust pipe 22 and the hydrogen system exhaust pipe are arranged in parallel.

[0075] On the other hand, a fuel cell engine exhaust control method is provided, and the fuel cell engine method comprises:

[0076] The air humidity and the hydrogen concentration in the fuel cell engine system body 1 are obtained;

[0077] The purging time of the fuel cell engine system body 1 is determined based on the air humidity and the hydrogen concentration, and the purging is performed;

[0078] After the purging is completed, the air supply assembly is used to supply air to the fuel cell engine system body 1, the hydrogen supply assembly is used to supply hydrogen to the fuel cell engine system body 1, and the exhaust and water joint 4 is used to exhaust the water vapor generated by the fuel cell engine system body 1.

[0079] The air humidity can be obtained by a humidity meter, and the hydrogen concentration can be obtained by a hydrogen content detector.

[0080] The above has described the embodiments of the present disclosure, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles, practical applications or technical improvements in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. A fuel cell engine tailpipe control system, characterized by, The fuel cell engine tail exhaust control system comprises: a fuel cell engine system body, the bottom of which is provided with a water outlet, and the side of which is provided with a hydrogen outlet; an air supply assembly, which is provided with an auxiliary air outlet pipe and an air compressor exhaust pipe, and is connected with the fuel cell engine system body; a hydrogen supply assembly, which is provided with a pressure relief pipe, and is connected with the fuel cell engine system body; an exhaust and water joint, which is connected with the water outlet and the hydrogen outlet of the fuel cell engine system body, the auxiliary air outlet pipe and the air compressor exhaust pipe of the air supply assembly, and the pressure relief pipe of the hydrogen supply assembly; wherein the cross-sectional area of the inlet and outlet of the exhaust and water joint is larger than that of the intersection of the exhaust and water joint and the water outlet and the hydrogen outlet of the fuel cell engine system body, the auxiliary air outlet pipe and the air compressor exhaust pipe of the air supply assembly, and the pressure relief pipe of the hydrogen supply assembly, and the flow rate of the fluid increases when flowing through the intersection; the exhaust and water joint comprises a water outlet joint, a hydrogen outlet joint, an auxiliary air outlet pipe joint, an air compressor exhaust pipe joint, and a hydrogen system exhaust joint; the water outlet joint is connected with the water outlet of the fuel cell engine system body; the hydrogen outlet joint is connected with the hydrogen outlet of the fuel cell engine system body; the auxiliary air outlet pipe joint is connected with the auxiliary air outlet pipe of the air supply assembly; the air compressor exhaust pipe joint is connected with the air compressor exhaust pipe of the air supply assembly; the hydrogen system exhaust joint is connected with the pressure relief pipe of the hydrogen supply assembly; the length of the water outlet joint and the auxiliary air outlet pipe joint is smaller than that of the hydrogen outlet joint; the diameter of the air compressor exhaust pipe joint is larger than that of the hydrogen outlet joint, the water outlet joint, and the auxiliary air outlet pipe joint; the length of the water outlet joint, the auxiliary air outlet pipe joint, and the hydrogen system exhaust joint is the same; the length of the air compressor exhaust pipe joint is larger than that of the water outlet joint, the auxiliary air outlet pipe joint, and the hydrogen system exhaust joint.

2. The fuel cell engine tailpipe control system of claim 1, wherein, the air supply assembly comprises an air source and an air compressor; the air source is connected with the air compressor, and the air compressor is connected with 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 the hydrogen concentration in the fuel cell engine system when the fuel cell engine system is initially started, and the fuel cell engine system is purged through the purge port according to the air humidity and the hydrogen concentration in the fuel cell engine system, and air is injected into the fuel cell engine system through the air inlet after the purging is completed.

3. The fuel cell engine tailpipe control system of claim 2, wherein, the air supply assembly further comprises an air outlet pipe line, the inlet of which is connected with the air outlet of the fuel cell engine system body, and the outlet of which is connected with the air compressor.

4. The fuel cell engine tailpipe control system of claim 3, wherein, the air supply assembly further comprises an air compressor auxiliary air inlet pipe line, the inlet of which is arranged on the air outlet pipe line, and the outlet of which is connected with the air compressor.

5. The fuel cell engine tailpipe control system of claim 1, wherein, the hydrogen supply assembly comprises a hydrogen source and a hydrogen pump; The hydrogen source is connected with a hydrogen pump, and the hydrogen pump is connected with a hydrogen inlet of the fuel cell engine system body.

6. The fuel cell engine tailpipe control system of claim 5, wherein, The hydrogen supply assembly further comprises a water vapor separator having a gas inlet, a gas outlet, an exhaust outlet and a liquid outlet. The gas inlet of the water vapor separator is connected with a hydrogen outlet of the fuel cell engine system, and the gas outlet is connected with the gas inlet of the hydrogen pump and then merged into the hydrogen inlet of the fuel cell engine system.

7. The fuel cell engine tailpipe control system of claim 6, wherein, The hydrogen supply assembly further comprises a safety valve arranged on a pressure relief pipeline, one end of the pressure relief pipeline being connected with the hydrogen pump, and the other end being connected with the exhaust and drainage joint.

8. A method of controlling the exhaust of a fuel cell engine according to any one of claims 1 to 7, characterized by, The method comprises the following steps: acquiring air humidity and hydrogen concentration in the fuel cell engine system body; determining purging time of the fuel cell engine system body based on the air humidity and hydrogen concentration, and performing purging; after purging is completed, providing air for the fuel cell engine system body through an air supply assembly, providing hydrogen for the fuel cell engine system body through a hydrogen supply assembly, and discharging water vapor generated by the fuel cell engine system body through an exhaust and drainage joint.

Images