Fuel cell auxiliary power device based on diesel reforming

Abstract

The invention provides a fuel cell auxiliary power device based on diesel reforming, which comprises an air supply unit, a water supply unit, a diesel supply unit, a diesel reforming unit and a power generation unit, the air supply unit is connected with the power generation unit and the diesel reforming unit, and is used for supplying gas to the power generation unit and the diesel reforming unit; the water supply unit is connected with the diesel oil reforming unit and used for supplying water to the diesel oil reforming unit, the diesel oil supply unit is connected with the diesel oil reforming unit and used for supplying diesel oil to the diesel oil reforming unit, and the diesel oil reforming unit is connected with the power generation unit and used for reforming the diesel oil and supplying the diesel oil to the power generation unit. The power generation unit receives the reformed diesel oil and the air supplied by the air supply unit and generates power. Diesel oil carried by an automobile is taken and reformed, chemical energy of the diesel oil is directly converted into electric energy to be used by the automobile, and energy carried by the automobile can be used for meeting the requirement for energy under the long-time stopping or parking working condition.

Description

Technical Field

[0001] This invention relates to the field of diesel reforming technology, and in particular to a fuel cell auxiliary power device based on diesel reforming. Background Technology

[0002] Currently, most vehicles, including automobiles and ships, are powered by traditional internal combustion engines such as diesel and gasoline engines, using fossil fuels like gasoline and diesel. Due to incomplete combustion, emissions from idling internal combustion engines are the most severe. Taking long-haul trucks as an example, during non-driving periods such as nighttime rest, waiting in line, and unloading cargo, truck drivers typically leave their diesel engines idling to maintain a relatively good working environment. This drives a generator to produce a small amount of electricity (approximately 3-5 kilowatts) to power onboard systems such as air conditioning, heating, refrigerators, lighting, radios, and other appliances. During this process, because the diesel engine's efficiency is lower than during normal operation, diesel consumption is significantly higher, and the resulting pollutants such as nitrogen oxides, sulfur oxides, and particulate matter are several times higher than during normal operation. Statistics show that long-haul truck diesel engines in the United States idle for more than 1456 hours annually. In recent years, due to environmental pollution issues, governments worldwide have continuously raised emission standards for transportation vehicles.

[0003] Currently, to reduce vehicle exhaust emissions and fuel consumption during idling, battery-based start-stop systems are widely used. When the vehicle is stationary (not parked), the engine stops operating (instead of traditional idling), and the battery supplies the necessary power. The engine restarts when the brake pedal is released. For example, Chinese patents CN 101238006B and CN 104553795B both employ battery-based start-stop systems.

[0004] However, due to the limited capacity of the vehicle's battery, when the vehicle is stationary, this system can only ensure the normal operation of low-power loads such as the vehicle's control system, radio, and audio system. The more power-consuming air conditioning system will switch to ventilation mode. Therefore, if the vehicle is stationary for too long, the interior will become quite stuffy. In addition, if the start-stop system operates for too long, it will automatically shut down due to low battery capacity. Therefore, the above technical solution has obvious limitations and can only be used for short-term power supply when the vehicle is waiting at traffic lights, etc. It cannot meet the energy needs of long-term stationary or parked conditions such as overnight rest, queuing, and unloading / receiving goods. Summary of the Invention

[0005] In view of this, it is necessary to provide a fuel cell auxiliary power unit based on diesel reforming that can meet the energy requirements of long-term stop or parking conditions.

[0006] This invention provides a fuel cell auxiliary power unit based on diesel reforming, comprising: An air supply unit is used to supply air. Water supply unit, used to supply water; Diesel supply unit, used to supply diesel fuel; A diesel reforming unit, connected to the air supply unit, the water supply unit, and the diesel supply unit, is used to reform diesel fuel; and The power generation unit is connected to the air supply unit and the diesel reforming unit. The power generation unit receives reformed diesel and air supplied by the air supply unit and generates electricity.

[0007] In other embodiments, the air supply unit includes a first air supply branch and a second air supply branch that are independent of each other. The first air supply branch is connected to the power generation unit and is used to supply air to the power generation unit. The second air supply branch is connected to the diesel reforming unit and is used to supply air to the diesel reforming unit.

[0008] In other embodiments, the diesel reforming unit includes a diesel reforming component, a super heater, an air heater, a steam generator, a desulfurization reactor, and a reforming heater. The inlet end of the diesel reforming component is connected to the diesel supply unit, the outlet end of the diesel reforming component is connected to the super heater, the air heater is connected to the super heater and the air supply unit, the steam generator is connected to the air heater, the desulfurization reactor is connected to the steam generator, and the reforming heater is connected to the desulfurization reactor.

[0009] In other embodiments, the diesel reforming assembly includes a start-up heater and a reformer, the start-up heater being connected to the air supply unit and the diesel supply unit, the outlet of the start-up heater being connected to the power generation unit via a connecting pipe, and the reformer being connected to the diesel supply unit.

[0010] In other embodiments, the cold-side outlet of the steam generator is connected in sequence to the cold-side inlet of the superheater and the reformer via a connecting pipe; the steam generator uses the heat carried by the high-temperature reforming gas from the reformer to heat the water from the water supply unit and convert it into steam.

[0011] In other embodiments, the power generation unit includes a power generation module, a residual gas burner, and a cathode air preheater. The power generation module is connected to the diesel reforming unit and is used to generate reformed gas from the diesel reforming unit for power generation. The residual gas burner is connected to the power generation module and is used to receive and burn the gas remaining in the power generation module. The inlet of the cathode air preheater is connected to the air supply unit and the residual gas burner, and the outlet of the cathode air preheater is connected to the power generation module. The cathode air preheater is used to heat the air supplied by the air supply unit using the heat generated by the combustion of the residual gas burner, and then sends the heated air to the power generation module.

[0012] In other embodiments, the power generation module includes a preheater and a fuel cell stack, the outlet of which is directly connected to the external environment; the anode outlet and cathode outlet of the fuel cell stack are respectively connected to a residual gas burner via connecting pipes; the preheater surrounds the fuel cell stack or is attached to the surface of the fuel cell stack; the preheater can utilize the high-temperature exhaust gas from the start-up heater to provide heat for the start-up of the fuel cell stack.

[0013] In other embodiments, the first air supply branch includes a first air filter, a first air compressor, and a first air flow meter. The outlet of the first air filter is connected to the inlet of the first air compressor, the outlet of the first air compressor is connected to the inlet of the first air flow meter, and the outlet of the first air flow meter is connected to the power generation unit.

[0014] In other embodiments, the second air supply branch includes a second air filter, a second air compressor, a second air flow meter, and an air three-way valve. The outlet of the second air filter is connected to the inlet of the second air compressor, the outlet of the second air compressor is connected to the inlet of the second air flow meter, the outlet of the second air flow meter is connected to the inlet of the air three-way valve, and the outlet of the air three-way valve is connected to the diesel reforming unit.

[0015] In other embodiments, the water supply unit includes a condenser, a water tank, a water pump, and a water flow meter connected sequentially via connecting pipes. The condenser is used to condense water vapor into liquid and send it to the water tank. The water pump draws liquid from the water tank and sends it to the diesel reforming unit. The water flow meter is used to count the liquid flow rate in the water supply unit.

[0016] The beneficial effects of this invention are as follows: This invention includes an air supply unit, a water supply unit, a diesel supply unit, a diesel reforming unit, and a power generation unit. The air supply unit is connected to the power generation unit and the diesel reforming unit, supplying them with gas. The water supply unit is connected to the diesel reforming unit, supplying it with water. The diesel supply unit is also connected to the diesel reforming unit, supplying it with diesel fuel. The diesel reforming unit is connected to the power generation unit, reforming the diesel fuel and supplying it to the power generation unit. The power generation unit receives the reformed diesel fuel and the air supplied by the air supply unit and generates electricity. In this invention, the system utilizes diesel fuel from the vehicle itself, reforming it to directly convert the chemical energy of the diesel into electrical energy for vehicle use. This allows the vehicle's onboard energy to meet the energy needs of prolonged periods of inactivity or parking. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a fuel cell auxiliary power unit based on diesel reforming in this invention. Wherein: 1-Air supply unit, 11-First air supply branch, 111-First air filter, 112-First air compressor, 113-First air flow meter, 12-Second air supply branch, 121-Second air filter, 122-Second air compressor, 123-Second air flow meter, 124-Air three-way valve. 2-Water supply unit, 21-Condenser, 22-Water tank, 23-Water pump, 24-Water flow meter; 3-Diesel supply unit, 31-Inlet valve, 32-Diesel pump, 33-Diesel flow meter, 34-Diesel three-way valve; 4-Diesel reforming unit, 41-Diesel reforming assembly, 411-Start-up heater, 412-Reformer, 42-Super heater, 43-Air heater, 44-Steam generator, 45-Desulfurization reactor, 46-Reformer heater; 5-Power generation unit, 51-Power generation module, 511-Preheater, 512-Electric stack, 52-Residual gas burner, 53-Cathode air preheater. Detailed Implementation

[0019] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0020] like Figure 1 As shown, an embodiment of the present invention provides a fuel cell auxiliary power device based on diesel reforming, comprising: an air supply unit 1, a water supply unit 2, a diesel supply unit 3, a diesel reforming unit 4, and a power generation unit 5. The air supply unit 1 is connected to the power generation unit 5 and the diesel reforming unit 4, and is used to supply gas to the power generation unit 5 and the diesel reforming unit 4. The water supply unit 2 is connected to the diesel reforming unit 4, and is used to supply water to the diesel reforming unit 4. The diesel supply unit 3 is connected to the diesel reforming unit 4, and is used to supply diesel to the diesel reforming unit 4. The diesel reforming unit 4 is connected to the power generation unit 5, and is used to reform the diesel and supply it to the power generation unit 5. The power generation unit 5 receives the reformed diesel and the air supplied by the air supply unit 1 and generates electricity.

[0021] In use, the air supply unit 1 supplies air to the power generation unit 5 and the diesel reforming unit 4, the water supply unit 2 supplies water to the diesel reforming unit 4, and the diesel supply unit 3 supplies diesel to the diesel reforming unit 4. The diesel reforming unit 4 receives the diesel supplied by the diesel supply unit 3, the air supplied by the air supply unit 1, and the water supplied by the water supply unit 2 to reform the diesel. The power generation unit 5 receives the reformed diesel from the diesel reforming unit 4 and the air supplied by the air supply unit 1, and generates electricity.

[0022] In this invention, there are an air supply unit 1, a water supply unit 2, a diesel supply unit 3, a diesel reforming unit 4, and a power generation unit 5. The diesel fuel carried by the vehicle is taken and reformed to directly convert the chemical energy of the diesel fuel into electrical energy for the vehicle to use. The energy carried by the vehicle can meet the energy demand for long-term stop or parking conditions.

[0023] Specifically, the air supply unit 1 includes a first air supply branch 11 and a second air supply branch 12 that are independent of each other. The first air supply branch 11 is connected to the power generation unit 5 and is used to supply air to the power generation unit 5. The second air supply branch 12 is connected to the diesel reforming unit 4 and is used to supply air to the diesel reforming unit 4.

[0024] Furthermore, the first air supply branch 11 includes a first air filter 111, a first air compressor 112, and a first air flow meter 113. The outlet of the first air filter 111 is connected to the inlet of the first air compressor 112, the outlet of the first air compressor 112 is connected to the inlet of the first air flow meter 113, and the outlet of the first air flow meter 113 is connected to the power generation unit 5. After being filtered by the first air filter 111, the air is compressed by the first air compressor 112 and sent to the power generation unit 5. The first air flow meter 113 is used to count the air flow of the first air supply branch 11.

[0025] Furthermore, the second air supply branch 12 includes a second air filter 121, a second air compressor 122, a second air flow meter 123, and an air three-way valve 124. The outlet of the second air filter 121 is connected to the inlet of the second air compressor 122, the outlet of the second air compressor 122 is connected to the inlet of the second air flow meter 123, the outlet of the second air flow meter 123 is connected to the inlet of the air three-way valve 124, and the outlet of the air three-way valve 124 is connected to the diesel reforming unit 4. After being filtered by the second air filter 121, the air is compressed by the second air compressor 122 and sent to the diesel reforming unit 4. The second air flow meter 123 is used to count the air flow of the second air supply branch 12.

[0026] Specifically, the water supply unit 2 includes a condenser 21, a water tank 22, a water pump 23, and a water flow meter 24 connected sequentially by connecting pipes. The condenser 21 is used to condense water vapor into liquid and send it to the water tank 22. The water pump 23 draws liquid from the water tank 22 and sends it to the diesel reforming unit 4. The water flow meter 24 is used to count the liquid flow rate in the water supply unit 2.

[0027] Specifically, the diesel supply unit 3 includes an inlet valve 31, a diesel pump 32, a diesel flow meter 33, and a diesel three-way valve 34. The inlet end of the inlet valve 31 is connected to the vehicle's fuel tank, the outlet end of the inlet valve 31 is connected to the inlet end of the diesel pump 32, the outlet end of the diesel pump 32 is connected to the inlet end of the diesel flow meter 33, the outlet end of the diesel flow meter 33 is connected to the inlet end of the diesel three-way valve 34, and the outlet end of the diesel three-way valve 34 is connected to the diesel reforming unit 4. The diesel supply unit 3 extracts diesel fuel from the vehicle's fuel tank and delivers it to the diesel reforming unit 4.

[0028] Specifically, the diesel reforming unit 4 includes a diesel reforming component 41, a super heater 42, an air heater 43, a steam generator 44, a desulfurization reactor 45, and a reforming heater 46. The oil inlet of the diesel reforming component 41 is connected to the diesel supply unit 3, and the oil outlet of the diesel reforming component 41 is connected to the super heater 42. The air heater 43 is connected to the super heater 42 and the second air supply branch 12. The steam generator 44 is connected to the air heater 43. The desulfurization reactor 45 is connected to the steam generator 44. The reforming heater 46 is connected to the desulfurization reactor 45. In use, the diesel reforming assembly 41 reforms diesel fuel, the super heater 42 heats steam, the air heater 43 heats the gas supplied by the second gas supply branch 12, the steam generator 44 generates reformed gas to adapt to the subsequent desulfurization reaction, the desulfurization reactor 45 desulfurizes the reformed gas, and the reforming heater 46 heats the desulfurized reformed gas and sends it to the power generation unit 5.

[0029] Furthermore, the diesel reforming assembly 41 includes a starter heater 411 and a reformer 412. The starter heater 411 is connected to the second gas supply branch 12 and the diesel supply unit 3. The outlet of the starter heater 411 is connected to the power generation unit 5 through a connecting pipe. The reformer 412 is connected to the diesel supply unit 3.

[0030] Furthermore, the start-up heater 411 is disposed inside or around the reformer 412; the start-up heater 411 can convert the chemical energy of diesel and air into heat energy through combustion, and transfer the generated heat energy to the reformer 412 for preheating the reformer 412; the output temperature of the start-up heater 411 can be adjusted between 400-1000℃ as required; the start-up heater 411 is turned on during the start-up phase of the reformer 412, and automatically turns off after the reformer 412 is successfully started.

[0031] Furthermore, the reformer 412 is loaded with one or more of the following diesel reforming catalysts: Ni-based, Pt-based, Ru-based, Rh-based, and Pd-based; the reformer 412 can convert diesel, air, and water into reformed gas rich in hydrogen, carbon monoxide, methane, and other components.

[0032] Furthermore, the cold-side outlet of the steam generator 44 is connected in sequence to the cold-side inlet of the super heater 42 and the reformer 412 via a connecting pipe; the steam generator 44 utilizes the heat carried by the high-temperature reformed gas from the reformer 412 to heat the water from the water supply unit 2 and convert it into steam.

[0033] Furthermore, the super heater 42 utilizes the heat carried by the high-temperature reformed gas from the reformer 412 to further increase the temperature of the steam from the steam generator 44.

[0034] Furthermore, the cold-side outlet of the air heater 43 is connected to the reformer 412 via a connecting pipe. The outlet reformed gas temperature of the reformer 412 is approximately 800°C; the super heater 42, air heater 43, and steam generator 44 can progressively cool the reformed gas from the reformer 412 to approximately 400°C to accommodate subsequent desulfurization reactions.

[0035] The desulfurization reactor 45 can remove part or all of the sulfides in the reformed gas; the desulfurizing agent used in the desulfurization reactor 45 is zinc oxide or other components.

[0036] Furthermore, the power generation unit 5 includes a power generation module 51, a residual gas burner 52, and a cathode air preheater 53. The power generation module 51 is connected to the diesel reforming unit 4 and is used to generate reformed gas from the diesel reforming unit 4 for power generation. The residual gas burner 52 is connected to the power generation module 51 and is used to receive and burn the remaining gas from the power generation module 51. The inlet of the cathode air preheater 53 is connected to the first gas supply branch 11 and the residual gas burner 52, and the outlet of the cathode air preheater 53 is connected to the power generation module 51. The cathode air preheater 53 is used to heat the air supplied by the first gas supply branch 11 using the heat generated by the combustion of the residual gas burner 52, and then sends the heated air to the power generation module 51.

[0037] Furthermore, the power generation module 51 includes a preheater 511 and a fuel cell stack 512. The outlet of the preheater 51 is directly connected to the external environment. The anode outlet and cathode outlet of the fuel cell stack 512 are respectively connected to the residual gas burner 52 via connecting pipes. The preheater 511 surrounds the fuel cell stack 512 or is in close contact with the surface of the fuel cell stack 512. The preheater 511 can utilize the high-temperature exhaust gas from the start-up heater 411 to provide heat for the start-up of the fuel cell stack 512. The preheater 511 is turned on during the system start-up phase and automatically turns off after the fuel cell stack 512 has successfully started up.

[0038] The fuel cell stack 512 is a solid oxide fuel cell that can convert the chemical energy of diesel reformate and air into electrical energy through an electrochemical reaction.

[0039] The residual gas at the anode of the fuel cell stack 512 still contains some unreacted hydrogen, carbon monoxide, etc., and the residual gas at the cathode still contains excess unused oxygen. The tail gas temperature at both the cathode and anode is approximately 800°C. The residual gas burner 52 converts the chemical energy of the residual gas at the cathode and anode of the fuel cell stack 512 into thermal energy through combustion, further improving the system's energy conversion efficiency.

[0040] The cathode air preheater 53 can use the high-temperature exhaust gas from the residual gas burner 52 to preheat the air from the first gas supply branch 11.

[0041] Specifically, the present invention also includes a DC-DC converter 6 and a control module 7. The output interface of the DC-DC converter 5 is connected to an external electrical load via a wire. The control module 7 is connected to the air supply unit 1, the water supply unit 2, the diesel supply unit 3, the diesel reforming unit 4, the power generation unit 5, and the DC-DC converter 6 via signal lines. The control module 7 can receive external commands and can start or stop the fuel cell auxiliary power unit according to the external commands. The control module 7 can control and monitor the start-up, operation, and stop states of the air supply unit 1, the water supply unit 2, the diesel supply unit 3, the diesel reforming unit 4, the power generation unit 5, and the DC-DC converter 6. The DC-DC converter 6 can convert the output electrical energy of the fuel cell stack 512 into DC power and then output the electrical energy to the external electrical load.

[0042] The beneficial effects of this invention are: This invention includes an air supply unit, a water supply unit, a diesel supply unit, a diesel reforming unit, and a power generation unit. The air supply unit is connected to the power generation unit and the diesel reforming unit, supplying them with gas. The water supply unit is connected to the diesel reforming unit, supplying it with water. The diesel supply unit is also connected to the diesel reforming unit, supplying it with diesel fuel. The diesel reforming unit is connected to the power generation unit, reforming the diesel fuel and supplying it to the power generation unit. The power generation unit receives the reformed diesel fuel and the air supplied by the air supply unit and generates electricity. In this invention, the system utilizes diesel fuel from the vehicle itself, reforming it to directly convert the chemical energy of the diesel into electrical energy for vehicle use. This allows the vehicle's onboard energy to meet the energy needs of prolonged periods of inactivity or parking.

[0043] In the description of this application, it should be noted that the terms "upper" and "lower," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the module or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0044] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A diesel reforming based fuel cell auxiliary power unit, characterized by, The application relates to a diesel reforming system, which comprises: an air supply unit for supplying air; a water supply unit for supplying water; a diesel supply unit for supplying diesel; a diesel reforming unit connected with the air supply unit, the water supply unit and the diesel supply unit, for reforming diesel; and a power generation unit connected with the air supply unit and the diesel reforming unit, which receives the reformed diesel and the air supplied by the air supply unit and generates power.

2. The diesel reforming based fuel cell auxiliary power unit of claim 1, wherein, The air supply unit comprises a first air supply branch and a second air supply branch, which are independent of each other, the first air supply branch is connected with the power generation unit and is used for supplying air to the power generation unit, and the second air supply branch is connected with the diesel reforming unit and is used for supplying air to the diesel reforming unit.

3. The diesel reforming based fuel cell auxiliary power unit of claim 1, wherein, The diesel reforming unit comprises a diesel reforming assembly, a superheater, an air heater, a steam generator, a desulfurization reactor and a reforming heater, the oil inlet end of the diesel reforming assembly is connected with the diesel supply unit, the oil outlet end of the diesel reforming assembly is connected with the superheater, the air heater is connected with the superheater and the air supply unit, the steam generator is connected with the air heater, the desulfurization reactor is connected with the steam generator, and the reforming heater is connected with the desulfurization reactor.

4. The diesel reforming based fuel cell auxiliary power unit of claim 3, wherein, The diesel reforming assembly comprises a start-up heater and a reformer, the start-up heater is connected with the air supply unit and the diesel supply unit, the outlet of the start-up heater is connected with the power generation unit through a connecting pipe, and the reformer is connected with the diesel supply unit.

5. The diesel reforming based fuel cell auxiliary power unit of claim 4, wherein, The cold side outlet of the steam generator is connected with the cold side inlet of the superheater and the reformer through connecting pipes in sequence; the steam generator uses the heat carried by the high-temperature reforming gas from the reformer to heat the water from the water supply unit and convert the water into water vapor.

6. The diesel reforming based fuel cell auxiliary power unit of claim 1, wherein, The power generation unit comprises a power generation module, a residual gas combustor and a cathode air preheater, the power generation module is connected with the diesel reforming unit and is used for generating power by using the reforming gas formed by the diesel reforming unit, the residual gas combustor is connected with the power generation module and is used for receiving and burning the residual gas of the power generation module, the air inlet of the cathode air preheater is connected with the air supply unit and the residual gas combustor, the air outlet of the cathode air preheater is connected with the power generation module, and the cathode air preheater is used for heating the air supplied by the air supply unit by using the heat generated by the residual gas combustor and sending the heated air to the power generation module.

7. The diesel reforming based fuel cell auxiliary power unit of claim 6, wherein, The power generation module comprises a preheater and a stack, the outlet of the preheater is directly connected with the external environment, the anode outlet and the cathode outlet of the stack are respectively connected with the residual gas combustor through connecting pipes, the preheater surrounds the stack or is closely attached to the surface of the stack, and the preheater can use the high-temperature tail gas from the start-up heater to provide heat for the start-up of the stack.

8. The diesel reforming based fuel cell auxiliary power unit of claim 2, wherein, The first air supply branch comprises a first air filter, a first air compressor, and a first air flow meter, the air outlet end of the first air filter is connected with the air inlet end of the first air compressor, the air outlet end of the first air compressor is connected with the air inlet end of the first air flow meter, and the air outlet end of the first air flow meter is connected with the power generation unit.

9. The diesel reforming based fuel cell auxiliary power unit of claim 2, wherein, The second air supply branch comprises a second air filter, a second air compressor, a second air flow meter, and an air three-way valve, the air outlet end of the second air filter is connected with the air inlet end of the second air compressor, the air outlet end of the second air compressor is connected with the air inlet end of the second air flow meter, the air outlet end of the second air flow meter is connected with the air inlet of the air three-way valve, and the air outlet of the air three-way valve is connected with the diesel reforming unit.

10. The diesel reforming based fuel cell auxiliary power unit of claim 1, wherein, The water supply unit comprises a condenser, a water tank, a water pump, and a water flow meter connected in sequence through a connecting pipe, the condenser is used for condensing water vapor into liquid and sending the liquid to the water tank, the water pump is used for pumping the liquid in the water tank to the diesel reforming unit, and the water flow meter is used for counting the liquid flow in the water supply unit.

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