Fuel supply device and method

Abstract

The present invention discloses a fuel supply device for a multi-stack high-temperature methanol fuel cell system, comprising: a fuel supply unit, a heat exchanger unit, a buffer unit, and a controller. The heat exchanger unit utilizes the waste heat of the multi-stack high-temperature methanol fuel cell system to heat the fuel, and the buffer unit is used to cache the fuel and supply fuel meeting a set temperature to the multi-stack high-temperature methanol fuel cell system. The present invention utilizes the heat exchanger unit to absorb the waste heat of the multi-stack high-temperature methanol fuel cell system and heats the fuel delivered to the heat exchanger unit by the fuel supply unit, fully utilizing the waste heat of the high-temperature methanol fuel cell, greatly improving the power generation efficiency of the high-temperature methanol fuel cell, and while improving the reliability of the fuel supply system, reducing the overall energy consumption and cost of the multi-stack fuel cell system.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a fuel supply device and method for a multi-stack high-temperature methanol fuel cell system. Background Art

[0002] A high-temperature methanol fuel cell is a new type of power generation device that can directly convert methanol-water solution into electricity. It has the advantages of high energy conversion efficiency, zero pollution, and abundant raw material sources. As a next-generation power generation technology, high-temperature methanol fuel cells can be widely used in electric vehicles, distributed power generation, transportation, and other fields. Currently, the power of high-temperature methanol fuel cell stacks is relatively small. When in use, they are usually composed of multiple fuel cell stacks to increase the output power of the power generation unit to meet high-power electricity demand. To meet the fuel supply needs of multiple high-temperature methanol fuel cell stacks, a fuel supply system is usually integrated into each single stack, resulting in complexity, reduced reliability, and high cost of the fuel supply system. Moreover, the fuel of high-temperature methanol fuel cells, namely methanol-water solution, requires a high temperature environment to participate in the reaction, and fails to effectively utilize the waste heat generated by itself, resulting in low fuel cell conversion efficiency. Summary of the Invention

[0003] The present invention proposes a fuel supply device and method, which can improve the overall efficiency of a multi-stack high-temperature methanol fuel cell system, simplify the fuel supply system, improve the reliability of the fuel supply system, and reduce the overall energy consumption and cost of the multi-stack fuel cell system.

[0004] To achieve the above objectives, the present invention provides a fuel supply device and method for a multi-stack high-temperature methanol fuel cell system. The multi-stack high-temperature methanol fuel cell system includes multiple fuel cell stacks and multiple fuel cell auxiliary components connected to the fuel cell stacks in a one-to-one correspondence. The fuel supply device includes:

[0005] a fuel supply unit, for providing fuel;

[0006] a heat exchanger unit connected to the fuel supply unit pipeline and the multiple high-temperature methanol fuel cell systems, the heat exchanger unit utilizing waste heat from the multiple high-temperature methanol fuel cell systems to heat the fuel;

[0007] a buffer unit connected to the heat exchanger unit and the multi-stack high-temperature methanol fuel cell system pipeline, the buffer unit being used to buffer the fuel and supply fuel meeting a set temperature to the multi-stack high-temperature methanol fuel cell system;

[0008] and a controller, which is respectively connected to the fuel supply unit, the heat exchanger unit and the buffer unit, and is used to control the working state of the fuel supply device to ensure that the working parameters of the buffer unit are within the set parameter range.

[0009] Furthermore, the fuel supply unit includes:

[0010] a main fuel tank, in which fuel is stored;

[0011] A detection unit provided on the main fuel tank, for monitoring various parameters of the fuel in real time;

[0012] A motor pump assembly is connected to the main fuel tank pipeline and is used to pump the fuel to the heat exchanger unit.

[0013] Furthermore, a first one-way valve, a first solenoid valve, a first filter and a first flow meter are provided on the pipeline between the fuel supply unit and the heat exchanger unit.

[0014] Furthermore, the detection unit includes: a first temperature sensor, a first liquid level sensor and a second filter; the first temperature sensor is used to monitor the temperature of the fuel in the main tank, the first liquid level sensor is used to monitor the liquid level of the fuel, and the second filter is used to filter the fuel.

[0015] Further, the heat exchanger unit includes a first heat exchanger and a second heat exchanger;

[0016] The first heat exchanger includes: a first heated source inlet, a first heated source outlet, a first heat source inlet, and a first heat source outlet, wherein the first heat source inlet is connected to the outlet end of the heat dissipation tail exhaust of each of the electric propulsion auxiliary components to utilize the waste heat of the electric propulsion auxiliary components to heat the fuel, and the first heat source outlet is connected to the atmosphere; the first heated source inlet is connected to the fuel supply unit, and the first heated source outlet is connected to the second heat exchanger pipeline;

[0017] The second heat exchanger includes: a second heated source inlet, a second heated source outlet, a third heated source inlet, a third heated source outlet, a second heat source inlet and a second heat source outlet; the second heat source inlet is connected to the outlet pipe of the reaction gas tail exhaust of each fuel cell stack to utilize the waste heat of the cathode reactor of the fuel cell stack to heat the fuel, and the second heat source outlet is connected to the atmosphere; the second heated source inlet is connected to the first heated source outlet, and the second heated source outlet is connected to the input end of the buffer unit; the third heated source inlet is connected to the output end of the buffer unit through a second solenoid valve, and the third heated source outlet is connected to the second heating source inlet through a second one-way valve;

[0018] The output end of the buffer unit, the third heated source inlet, the third heated source outlet, the second one-way valve, the second heated source inlet, the second heated source outlet, and the input end of the buffer unit together constitute the first circulation loop for fuel temperature regulation.

[0019] Furthermore, a second temperature sensor is provided at the outlet of the first heat source, and a third temperature sensor is provided at the outlet of the second heat source, for detecting the waste heat temperature of the first heat exchanger and the second heat exchanger respectively;

[0020] The second heat source outlet is further connected to the first heat source inlet via a temperature control valve, and the temperature control valve is used to selectively connect the second heat source outlet to the atmosphere or the first heat source inlet according to the waste heat temperature of the first heat exchanger and the waste heat temperature of the second heat exchanger;

[0021] A third one-way valve is further provided between the second heat source outlet and the first heat source inlet.

[0022] Furthermore, the output end of the buffer unit is also connected to the cathode of each fuel cell stack through a third solenoid valve, and is also connected to the fuel supply unit pipeline through a fourth solenoid valve; the output end of the buffer unit, the fuel supply unit, the first heat exchanger, the second heat exchanger and the input end of the buffer unit together constitute the second circulation loop for fuel temperature regulation.

[0023] Furthermore, the buffer unit includes: a buffer tank, and a fourth temperature sensor provided on the buffer tank, wherein the fourth temperature sensor is used to monitor the temperature of the fuel in the buffer tank.

[0024] Furthermore, an overflow valve is provided between the buffer unit and the fuel supply unit.

[0025] Based on the same inventive concept, the present invention also proposes a fuel supply method for a multi-stack high-temperature methanol fuel cell system, comprising the following steps:

[0026] Providing the above-mentioned fuel supply device to supply fuel to multiple high-temperature methanol fuel cell systems;

[0027] If the temperature of the fuel in the buffer tank is lower than the set temperature, the opening of the second solenoid valve is controlled to operate the first circulation loop for fuel temperature regulation;

[0028] If the temperature of the fuel in the buffer tank is higher than the set temperature, the openings of the second solenoid valve and the fourth solenoid valve are controlled, and the first circulation loop and the second circulation loop for regulating the fuel temperature are operated simultaneously.

[0029] Furthermore, the fuel supply method further comprises the following steps:

[0030] If the waste heat temperature of the second heat exchanger is greater than the waste heat temperature of the first heat exchanger, the temperature control valve is controlled to connect the second heat source outlet with the second heat source inlet.

[0031] The present invention has the following advantages:

[0032] The present invention utilizes a heat exchanger unit to absorb waste heat from multiple high-temperature methanol fuel cell systems, heats the fuel delivered to the heat exchanger unit by the fuel supply unit, and then supplies fuel meeting the set temperature to the multiple high-temperature methanol fuel cell systems through the buffer unit. This utilizes the waste heat of the high-temperature methanol fuel cell, greatly improving the power generation efficiency of the high-temperature methanol fuel cell, while improving the reliability of the fuel supply system and reducing the overall energy consumption and cost of the multiple fuel cell systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic structural diagram of a fuel supply device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims. It should be noted that the drawings are greatly simplified and not to exact ratios, and are intended solely to facilitate and clearly illustrate the embodiments of the present invention.

[0035] The multi-stack high-temperature methanol fuel cell system includes multiple fuel cell stacks and multiple fuel cell auxiliary components connected to each of the fuel cell stacks. The present invention proposes a fuel supply device that utilizes the waste heat of the multi-stack high-temperature methanol fuel cell system to heat the fuel, thereby supplying fuel to the multi-stack high-temperature methanol fuel cell system at a set temperature. This device improves the overall efficiency of the multi-stack high-temperature methanol fuel cell system while simplifying the fuel supply system, reducing the overall energy consumption and cost of the multi-stack fuel cell system.

[0036] like Figure 1 As shown, the fuel supply device includes:

[0037] a fuel supply unit, for providing fuel;

[0038] a heat exchanger unit connected to the fuel supply unit pipeline and the multi-stack high-temperature methanol fuel cell system pipeline, the heat exchanger unit utilizing waste heat from the multi-stack high-temperature methanol fuel cell system to heat the fuel;

[0039] a buffer unit connected to the heat exchanger unit and the multi-stack high-temperature methanol fuel cell system 23 by pipeline, the buffer unit being used to buffer the fuel and supply fuel meeting a set temperature to the multi-stack high-temperature methanol fuel cell system 23;

[0040] A controller is connected to the fuel supply unit, the heat exchanger unit and the buffer unit respectively, and is used to control the working state of the fuel supply device to ensure that the working parameters of the buffer unit are within the set parameter range.

[0041] The fuel supply unit includes: a main fuel tank 1, which stores fuel; a detection unit arranged on the main fuel tank 1, used to monitor various parameters of the fuel in real time; a motor pump assembly 2, which is connected to the pipeline of the main fuel tank 1, and is used to pump the fuel to the heat exchanger unit; and a first one-way valve 6, a first solenoid valve 9, a first filter 7 and a first flow meter 8 arranged on the pipeline between the main fuel tank 1 and the heat exchanger unit.

[0042] The motor pump assembly 2 includes two sets of motor pumps that serve as backup for each other to improve the reliability of the fuel supply unit. The detection unit includes a first temperature sensor 3, a first liquid level sensor 4, and a second filter 5. The first temperature sensor 3 is used to monitor the temperature of the fuel in the main fuel tank 1, the first liquid level sensor 4 is used to monitor the liquid level of the fuel, and the second filter 5 is used to filter the fuel. Furthermore, the detection unit, motor pump assembly 2, first solenoid valve 9, and first flowmeter 8 are all connected to the controller. The controller can control the operating state of the fuel supply unit by controlling the detection unit, motor pump assembly 2, first solenoid valve 9, and first flowmeter 8.

[0043] The heat exchanger unit includes a first heat exchanger 10 and a second heat exchanger 14, which are connected in series. The first heat exchanger 10 is used to absorb waste heat from auxiliary components of the fuel cell stack to heat the fuel transferred to the first heat exchanger 10, and the second heat exchanger 14 is used to absorb waste heat from the cathode reactor of the fuel cell stack 24 to heat the fuel transferred to the second heat exchanger 14.

[0044] The first heat exchanger 10 includes a first heated source inlet L1, a first heated source outlet L11, a first heat source inlet H1, and a first heat source outlet H11. The first heat source inlet H1 is connected to the outlet of the heat dissipation tail pipe of each auxiliary component of the stack to utilize the waste heat of the auxiliary component to heat the fuel. The first heat source outlet H11 is connected to the atmosphere to discharge waste heat from the first heat exchanger 10. The first heated source inlet L1 is connected to the fuel supply pipeline, and the first heated source outlet L11 is connected to the second heat exchanger 14. Furthermore, a fourth one-way valve 27 is provided in the pipeline between the first heat source inlet H1 and the outlet of the heat dissipation tail pipe of each auxiliary component of the stack.

[0045] The second heat exchanger 14 includes: a second heated source inlet L2, a second heated source outlet L22, a third heated source inlet L3, a third heated source outlet L33, a second heat source inlet H2, and a second heat source outlet H22. The second heat source inlet H2 is connected to the outlet pipeline of the reaction gas tail exhaust of each fuel cell stack 24 to utilize the waste heat of the cathode reactor of the fuel cell stack 24 to heat the fuel. The second heat source outlet H22 is connected to the atmosphere for discharging the waste heat in the second heat exchanger 14. The second heated source inlet L2 is connected to the first heated source outlet L11 by pipeline, and the second heated source outlet L22 is connected to the input end of the buffer unit. The third heated source inlet L3 is connected to the output end pipeline of the buffer unit via a second solenoid valve 28, and the third heated source outlet L33 is connected to the second heated source inlet L2 by pipeline via a second one-way valve 13.

[0046] The output end of the buffer unit, the third heated source inlet L3, the third heated source outlet L33, the second one-way valve 13, the second heated source inlet L2, the second heated source outlet L22, and the input end of the buffer unit together constitute the first circulation loop for fuel temperature regulation.

[0047] The second heat source outlet H22 is also connected to the first heat source inlet H1 through a second one-way valve 25. A second temperature sensor 11 is provided at the first heat source outlet H11 for monitoring the waste heat temperature of the first heat exchanger 10. A third temperature sensor 12 is provided at the second heat source outlet H22 for detecting the waste heat temperature of the second heat exchanger 14. The second temperature sensor 11, the third temperature sensor 12 and the second one-way valve 25 are all connected to the controller, and the controller controls the connection state of the second one-way valve 25 according to the waste heat temperature of the first heat exchanger 10 and the waste heat temperature of the second heat exchanger 14, thereby selectively connecting the second heat source outlet H22 to the atmosphere or the first heat source inlet H1. Furthermore, a third one-way valve 26 is also provided between the second heat source outlet H22 and the first heat source inlet H1.

[0048] The output of the buffer unit is also connected to the cathode of each fuel cell stack 24 via a third solenoid valve 22, and is also connected to the fuel supply unit pipeline via a fourth solenoid valve 20. The output of the buffer unit, the fuel supply unit, the first heat exchanger 10, the second heat exchanger 14, and the input of the buffer unit together form a second circulation loop for regulating the fuel temperature. Furthermore, a relief valve 19 is provided between the buffer unit and the fuel supply unit, and a second flow meter 21 is provided between the buffer unit and the multiple high-temperature methanol fuel cell systems 23.

[0049] The buffer unit includes a buffer tank 15, a fourth temperature sensor 17, a pressure sensor 18, and a second liquid level sensor 16, disposed on the buffer tank 15. The fourth temperature sensor 17 is used to monitor the temperature of the fuel within the buffer tank 15. The second solenoid valve 28, the fourth solenoid valve 20, and the fourth temperature sensor 17 are all connected to the controller. The controller determines whether the fuel within the buffer unit meets a set temperature based on the temperature of the fourth temperature sensor 17, and controls the openings of the second solenoid valve 28 and the fourth solenoid valve 20, thereby selecting the first and second circulation loops to operate and thereby regulating the temperature of the fuel within the buffer unit.

[0050] Based on the same inventive concept, the present invention also proposes a fuel supply method for a multi-stack high-temperature methanol fuel cell system 23, comprising the following steps:

[0051] Providing the above-mentioned fuel supply device to supply fuel to the multi-stack high-temperature methanol fuel cell system 23;

[0052] If the temperature of the fuel in the buffer tank 15 is lower than the set temperature, the opening of the second solenoid valve 28 is controlled to operate the first circulation loop;

[0053] If the temperature of the fuel in the buffer tank 15 is higher than the set temperature, the openings of the second solenoid valve 28 and the fourth solenoid valve 20 are controlled to operate the first circulation loop and the second circulation loop at the same time;

[0054] If the waste heat temperature of the second heat exchanger 14 is greater than the temperature of the heat source inside the first heat exchanger 10 , the second one-way valve 25 is controlled to connect the second heat source outlet H22 with the second heat source inlet H2 .

[0055] Specifically, fuel is supplied by the fuel supply unit, heated by the first and second heat exchangers 10 and 14, and then enters the buffer tank 15 within the buffer unit. When the fuel temperature in the buffer tank 15 falls below the set temperature, a portion of the fuel flows through the third solenoid valve 22 and enters each fuel cell stack 24. Another portion of the fuel flows through the second solenoid valve 28 and into the second heat exchanger 14, where it is heated again. The remaining portion then flows out of the third heated source outlet L33 and, along with the fuel flowing out of the first heat exchanger 10, flows into the second heat exchanger 14 for further heating, forming a first circulation loop. When the fuel temperature in the buffer tank 15 rises above the set temperature, the controller controls the opening of the fourth solenoid valve 20, maintaining the first circulation loop, to allow the heated portion of the fuel to flow back into the main fuel tank 1, heating the fuel there and improving the utilization of the high-temperature methanol fuel cell tail exhaust preheating.

[0056] When the value of the third temperature sensor 12 is greater than the value of the second temperature sensor 11, the controller controls the second one-way valve 25 to allow the high-temperature gas from the second heat source outlet H22 of the second heat exchanger 14 to directly enter the first heat source inlet H1 of the first heat exchanger 10, and after heat exchange, it is discharged into the atmosphere through the pipeline from the first heat source outlet H11.

[0057] Example

[0058] Taking a fixed power station as an example, the maximum power demand of multiple high-temperature methanol fuel cells 23 is 240 kW. Four high-temperature methanol fuel cell stacks 24 are used to supply power. The number of individual high-temperature methanol fuel cell stacks 24 is 12, and the power demand of the fixed power station is P. Using the optimized stacking method, it is calculated that 48 individual fuel cell stacks with a power of 5 kW (P2) are required. Combining these 12 individual stacks into a single unit results in a multi-stack fuel cell unit with a power of 60 kW (P1). This satisfies the total power demand of 240 kW (P = 4 × P1 = 4 × (12 × P2)). Based on the output power of the individual fuel cell stacks 24, the stack characteristics, and the characteristics of the actuators, the pressure range of the buffer tank 15 is calculated to be 1.1 bar to 2.4 bar, and the temperature range of the buffer tank 15 is 40°C to 60°C. According to the temperature and pressure control strategy of the buffer tank, when the temperature inside the buffer tank is lower than 40°C, the heat exchange system executes the first circulation loop and controls the motor pump assembly to control the flow rate; when it is higher than 60°C, the heat exchange system executes the second circulation loop and controls the motor pump assembly to recover more waste heat from the high-temperature methanol fuel cell and improve the overall power generation efficiency of the system.

[0059] The present invention utilizes a heat exchanger unit to absorb waste heat from multiple high-temperature methanol fuel cell systems, heats the fuel delivered to the heat exchanger unit by the fuel supply unit, and then supplies fuel meeting the set temperature to the multiple high-temperature methanol fuel cell systems through a buffer unit. This fully utilizes the waste heat of the high-temperature methanol fuel cell, greatly improves the power generation efficiency of the high-temperature methanol fuel cell, and while improving the reliability of the fuel supply system, reduces the overall energy consumption and cost of the multiple fuel cell systems.

[0060] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description is not intended to limit the present invention. After reading the above description, various modifications and substitutions of the present invention will become apparent to those skilled in the art. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A fuel supply device for a multi-stack high-temperature methanol fuel cell system, wherein the multi-stack high-temperature methanol fuel cell system comprises a plurality of fuel cell stacks and a plurality of fuel cell stack auxiliary components connected one-to-one with the fuel cell stacks, characterized in that: The fuel supply device comprises: a fuel supply unit, for providing fuel; a heat exchanger unit connected to the fuel supply unit pipeline and the multi-stack high-temperature methanol fuel cell system pipeline, the heat exchanger unit utilizing waste heat from the multi-stack high-temperature methanol fuel cell system to heat the fuel; a buffer unit connected to the heat exchanger unit and the multi-stack high-temperature methanol fuel cell system pipeline, the buffer unit being used to buffer the fuel and supply fuel meeting a set temperature to the multi-stack high-temperature methanol fuel cell system; a controller, connected to the fuel supply unit, the heat exchanger unit, and the buffer unit, respectively, for controlling the working state of the fuel supply device to ensure that the working parameters of the buffer unit are within a set parameter range; The heat exchanger unit includes a first heat exchanger and a second heat exchanger; The second heat exchanger includes: a second heated source inlet, a second heated source outlet, a third heated source inlet, a third heated source outlet, a second heat source inlet, and a second heat source outlet; the third heated source outlet is connected to the second heated source inlet via a second one-way valve; The output end of the buffer unit, the third heated source inlet, the third heated source outlet, the second one-way valve, the second heated source inlet, the second heated source outlet, and the input end of the buffer unit together constitute a first circulation loop for regulating the fuel temperature; The output end of the buffer unit, the fuel supply unit, the first heat exchanger, the second heat exchanger and the input end of the buffer unit together form a second circulation loop for regulating the fuel temperature.

2. The fuel supply device according to claim 1, wherein: The fuel supply unit comprises: a main fuel tank, in which fuel is stored; A detection unit provided on the main fuel tank, for monitoring various parameters of the fuel in real time; a motor pump assembly connected to the main tank pipeline for pumping the fuel to the heat exchanger unit; and A first one-way valve, a first solenoid valve, a first filter and a first flow meter are arranged on the pipeline between the motor pump assembly and the heat exchanger unit.

3. The fuel supply device according to claim 2, wherein: The detection unit includes: a first temperature sensor, a first liquid level sensor and a second filter; the first temperature sensor is used to monitor the temperature of the fuel in the main tank, the first liquid level sensor is used to monitor the liquid level of the fuel, and the second filter is used to filter the fuel.

4. The fuel supply device according to claim 1, wherein: The first heat exchanger includes: a first heated source inlet, a first heated source outlet, a first heat source inlet, and a first heat source outlet. The first heat source inlet is connected to the outlet pipe of the heat dissipation tail pipe of each of the auxiliary components of the fuel stack to heat the fuel by utilizing the waste heat of the auxiliary components of the fuel stack. The first heat source outlet is connected to the atmosphere. The first heated source inlet is connected to the pipeline of the fuel supply unit, and the first heated source outlet is connected to the pipeline of the second heat exchanger. The second heat source inlet is connected to the outlet pipeline of the reaction gas tail exhaust of each fuel cell stack to utilize the waste heat of the cathode reactor of the fuel cell stack to heat the fuel, and the second heat source outlet is connected to the atmosphere; the second heated source inlet is connected to the first heated source outlet, and the second heated source outlet is connected to the input end pipeline of the buffer unit; the third heated source inlet is connected to the output end of the buffer unit through a second solenoid valve.

5. The fuel supply device according to claim 4, wherein: A second temperature sensor is provided at the outlet of the first heat source, and a third temperature sensor is provided at the outlet of the second heat source, for detecting the waste heat temperature of the first heat exchanger and the waste heat temperature of the second heat exchanger respectively; The second heat source outlet is further connected to the first heat source inlet via a temperature control valve, and the temperature control valve is used to selectively connect the second heat source outlet to the atmosphere or the first heat source inlet according to the waste heat temperature of the first heat exchanger and the waste heat temperature of the second heat exchanger; A third one-way valve is further provided between the second heat source outlet and the first heat source inlet.

6. The fuel supply device according to claim 4, wherein: The output end of the buffer unit is also connected to the cathode of each fuel cell stack through a third solenoid valve, and is connected to the pipeline of the fuel supply unit through a fourth solenoid valve.

7. The fuel supply device according to claim 6, wherein: The buffer unit includes: a buffer tank and a fourth temperature sensor provided on the buffer tank, wherein the fourth temperature sensor is used to monitor the temperature of the fuel in the buffer tank.

8. The fuel supply device according to claim 6, wherein: An overflow valve is further provided between the buffer unit and the fuel supply unit.

9. A fuel supply method for a multi-stack high-temperature methanol fuel cell system, characterized in that: The following steps are involved: Providing a fuel supply device according to any one of claims 1 to 8 to supply fuel to a multi-stack high-temperature methanol fuel cell system; If the temperature of the fuel in the buffer tank is lower than the set temperature, the opening of the second solenoid valve is controlled to operate the first circulation loop for fuel temperature regulation; If the temperature of the fuel in the buffer tank is higher than the set temperature, the openings of the second solenoid valve and the fourth solenoid valve are controlled, and the first circulation loop and the second circulation loop for regulating the fuel temperature are operated simultaneously.

10. The fuel supply method according to claim 9, wherein: The following steps are also included: If the waste heat temperature of the second heat exchanger is greater than the waste heat temperature of the first heat exchanger, the temperature control valve is controlled to connect the second heat source outlet with the second heat source inlet.

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