S0FC quick starting method based on PEMFC auxiliary electrothermal coupling

Abstract

The invention discloses an S0FC rapid starting method based on PEMFC auxiliary electrothermal coupling, and the method comprises the following steps: starting a PEMFC electric pile, and enabling the PEMFC electric pile to have power generation capability; the SOFC electric pile is subjected to heating treatment through electric energy output and tail gas emission of the PEMFC electric pile; and after the temperature of the SOFC electric pile reaches 600-650 DEG C, starting the SOFC electric pile to generate power. The advantages of electric heating and combustion heat exchange are combined, common heating of the interior and the exterior of the electric pile is achieved, the electric pile has the advantages of being high in heating rate, small in electric pile temperature gradient, high in fuel utilization rate, high in energy efficiency, capable of protecting the electric pile structure and the like, and the electric pile heating rate is practically increased.

Description

Technical Field

[0001] The present invention relates to the field of new energy and fuel cells, and in particular to a SOFC quick start method based on PEMFC auxiliary electric-thermal coupling. Background Art

[0002] Currently reported SOFC stack startup methods include direct heating with a resistance furnace, internal electric heating wire heating, external heat source heating, combustion heat exchange, multiple stacks or batteries, etc. Direct heating with a resistance furnace is achieved by heating the resistance inside the furnace and then indirectly heating the stack surface through heat exchange. This is a traditional stack heating method that is inefficient, time-consuming and has uneven heating inside and outside the stack.

[0003] The internal heating wire heating method is to bury the heating wire inside the battery stack during assembly to achieve internal heating of the stack. The heating rate is relatively fast, but there are many factors such as the embedding position of the resistance wire and the uniformity of laying. The process is difficult to master. In addition, it will consume extra electricity and reduce efficiency. External heat source heating refers to the introduction of special flow channels inside the battery stack to allow external heat sources such as air to flow through to achieve internal heating of the stack. This method is subject to complex structure and high processing cost of the connector. In addition, solid particles in the heat source gas can easily block the flow field channel, resulting in local high temperature of the battery stack, causing battery cracking or connector warping.

[0004] The combustion heat exchange method is similar to the resistance furnace heating method. It heats the fuel stack through direct combustion of fuel and air. The disadvantage is that direct combustion can easily damage the fuel stack fixture and increase the risk of leakage. The multi-stack combination reported is two SOFC stacks, but the SOFC stack itself starts slowly. Starting one stack to heat another is inefficient and takes a long time. Summary of the invention

[0005] The object of the present invention is to provide a SOFC rapid start-up method based on PEMFC auxiliary electric and thermal coupling to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A SOFC quick start method based on PEMFC auxiliary electric and thermal coupling comprises the following steps:

[0008] Step S1, starting the PEMFC stack to enable it to have power generation capability;

[0009] Step S2, heating the SOFC stack through the power output and tail gas emission of the PEMFC stack;

[0010] Step S3, after the SOFC stack reaches 600-650° C., start the SOFC stack to generate electricity.

[0011] Furthermore, in step S1, the step of starting the PEMFC stack to enable it to have power generation capability includes:

[0012] Step S101, after the hydrogen is subjected to pressure, temperature and humidity adjustment, it is passed into the anode of the PEMFC stack, wherein the temperature of the hydrogen is adjusted to 60-85° C.;

[0013] Step S102, after adjusting the pressure, temperature and humidity of the air, the air is passed into the cathode of the PEMFC stack, wherein the air temperature is adjusted to 60-85° C.;

[0014] Step S103, after pressurizing, heating and heat exchange treatment of the cooling water channel, the cooling water channel enters the cooling channel of the PEMFC stack, and after 10 minutes, the PEMFC stack starts to generate electricity;

[0015] Furthermore, in step S2, the step of heating the SOFC stack by means of the power output and tail gas emission of the PEMFC stack includes:

[0016] Step S201, transmitting the electric energy generated by the PEMFC stack to the heating element disposed inside the SOFC stack to increase the temperature inside the SOFC stack;

[0017] Step S202, introducing the exhaust gas emitted by the PEMFC stack into the combustion chamber for combustion, and using the heat generated by the combustion to heat the outside of the SOFC stack, so that the temperature of the outside of the SOFC stack gradually increases to 500-550° C.;

[0018] Step S203, introducing natural gas and air into the combustion chamber for combustion, further heating the outside of the SOFC stack to make the outside temperature of the SOFC stack reach 580-620° C.;

[0019] Furthermore, in step S3, after the SOFC stack reaches a specific temperature condition, the step of starting the SOFC stack to generate electricity includes:

[0020] Step S301, after decompression, desulfurization, heat exchange and flow control of natural gas, the natural gas is passed into the anode of the SOFC stack, wherein the temperature of the natural gas is adjusted to 550-600° C.;

[0021] Step S302, after pressurizing, depressurizing, exchanging heat and performing secondary heating on the air, the air is passed into the cathode of the SOFC stack, wherein the air temperature is adjusted to 580-630° C.;

[0022] Step S303, when the temperature of the SOFC stack reaches 600-650°C, the natural gas and air are reacted in the SOFC stack to generate electricity, the tail gas generated by the power generation is introduced into the burner for combustion, and the combusted gas is returned to the inlet end heat exchanger;

[0023] Furthermore, in step S101, the pressure regulation, temperature regulation and humidity regulation of hydrogen specifically include:

[0024] Step S1011, the high-pressure hydrogen first passes through a pressure reducing valve to reduce the pressure to a set value;

[0025] Step S1012, then enter the heater to raise the temperature to 60-85°C;

[0026] Step S1013, then humidifying through a humidifying tank or directly entering the anode pipeline of the PEMFC stack in the form of dry gas;

[0027] Furthermore, in step S102, the pressure regulation, temperature regulation and humidity regulation of the air specifically include:

[0028] Step S1021, the air is first pressurized to a set pressure by a compressor;

[0029] Step S1022, the pressure is reduced to a suitable pressure through a pressure reducing valve, and then the pressure is heated to 60-85°C by a heater;

[0030] Step S1023, then humidifying through a humidifying tank or directly entering the cathode pipeline of the PEMFC stack in the form of dry gas;

[0031] Furthermore, in step S201, the electric energy generated by the PEMFC stack is transmitted to the heating element provided inside the SOFC stack, specifically, the electric energy generated by the PEMFC stack is connected to the heating wire embedded inside the SOFC stack through a wire, and the heating wire generates heat under the action of the electric energy, so that the temperature inside the SOFC stack is gradually increased to 500-550° C.;

[0032] Furthermore, in step S202, the tail gas discharged by the PEMFC stack is introduced into the combustion chamber for combustion. Specifically, the tail gas and waste heat of the PEMFC stack are introduced into the closed combustion chamber through a pipeline, and are mixed with the introduced natural gas and air in the combustion chamber for combustion. The heat generated by the combustion is transferred to the outside of the SOFC stack through a heat exchanger, so that the external temperature of the SOFC stack reaches 580-620°C.

[0033] Furthermore, the step S301 is to perform pressure reduction, desulfurization, heat exchange and flow control on the natural gas, specifically, the natural gas is passed through a pressure reducing valve to reduce the pressure to a set value, the sulfur component is removed through a desulfurizer, and then the natural gas is passed through a heat exchanger for heat exchange to make the natural gas temperature reach 550-600°C, and then the water vapor is adjusted through a water tank, and finally the gas is passed through a check valve to prevent gas backflow, and then enters the anode pipeline of the SOFC stack;

[0034] Furthermore, in step S302, the air is pressurized, decompressed, heat-exchanged and reheated by first pressurizing the air to a set pressure through a compressor, then decompressing the air to a suitable pressure through a pressure reducing valve, then exchanging heat through a heat exchanger, and then entering a closed combustion chamber, and then being reheated to 580-630°C through a coil, and finally entering the cathode pipeline of the SOFC stack.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The present invention combines the advantages of electric heating and combustion heat exchange, realizes joint heating of the inside and outside of the fuel cell stack, and has the characteristics of fast heating rate, small temperature gradient of the fuel cell stack, high fuel utilization rate, high energy efficiency, and protection of the fuel cell stack structure, which effectively improves the heating rate of the fuel cell stack. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 The present invention is a schematic flow chart of a SOFC quick start method based on PEMFC assisted electrothermal coupling. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] See also Figure 1 , the present invention provides a technical solution:

[0040] A SOFC quick start method based on PEMFC auxiliary electric and thermal coupling comprises the following steps:

[0041] Step S1, starting the PEMFC stack to enable it to have power generation capability, including:

[0042] Step S101, after the hydrogen is subjected to pressure, temperature and humidity adjustment, it is passed into the anode of the PEMFC stack, wherein the temperature of the hydrogen is adjusted to 60-85° C.;

[0043] Step S102, after adjusting the pressure, temperature and humidity of the air, the air is passed into the cathode of the PEMFC stack, wherein the air temperature is adjusted to 60-85° C.;

[0044] Step S103, after pressurizing, heating and heat exchange treatment of the cooling water channel, the cooling water channel enters the cooling channel of the PEMFC stack, and after 10 minutes, the PEMFC stack starts to generate electricity;

[0045] Furthermore, the pressure regulation, temperature regulation and humidity regulation of hydrogen specifically include:

[0046] Step S1011, the high-pressure hydrogen first passes through a pressure reducing valve to reduce the pressure to a set value;

[0047] Step S1012, then enter the heater to raise the temperature to 60-85°C;

[0048] Step S1013, then humidify through a humidification tank or directly enter the anode pipeline of the PEMFC stack in the form of dry gas.

[0049] In step S1, high-pressure hydrogen is reduced to a suitable pressure through a pressure reducing valve, and air is pressurized by a compressor and then reduced to a specific pressure through a pressure reducing valve. Precise pressure control ensures uniform distribution and stable flow of gas in the stack, which is conducive to the full progress of the electrochemical reaction and improves the power generation efficiency of the PEMFC stack. Both hydrogen and air are heated to 75°C by a heater before entering the stack. The appropriate temperature provides good kinetic conditions for the electrochemical reaction, accelerates the reaction rate, and further improves the power generation efficiency. The humidity of hydrogen and air can be adjusted to a suitable range through a humidifying tank. The appropriate humidity helps maintain the good conductivity of the proton exchange membrane and extend the service life of the membrane, thereby improving the performance stability of the PEMFC stack.

[0050] Among them, after the cooling water circuit is pressurized to 4.5 bar by the water pump, the water temperature is stabilized at 50°C through the heater and heat exchanger before entering the fuel cell stack cooling water circuit. It can not only effectively take away the heat generated by the fuel cell stack reaction and prevent the fuel cell stack from being damaged due to overheating, but also maintain the fuel cell stack working within a stable temperature range, ensuring the long-term stable operation of the PEMFC fuel cell stack.

[0051] Step S2, heating the SOFC stack through the power output and tail gas emission of the PEMFC stack, including:

[0052] Step S201, transmitting the electric energy generated by the PEMFC stack to the heating element disposed inside the SOFC stack to increase the temperature inside the SOFC stack;

[0053] In the step S201, the electric energy generated by the PEMFC stack is transmitted to the heating element provided inside the SOFC stack. Specifically, the electric energy generated by the PEMFC stack is connected to the heating wire pre-buried inside the SOFC stack through a wire. The heating wire generates heat under the action of the electric energy, so that the internal temperature of the SOFC stack gradually increases to 500-550°C.

[0054] Step S202, introducing the exhaust gas emitted by the PEMFC stack into the combustion chamber for combustion, and using the heat generated by the combustion to heat the outside of the SOFC stack, so that the temperature of the outside of the SOFC stack gradually increases to 500-550° C.;

[0055] In step S202, the exhaust gas emitted by the PEMFC stack is introduced into the combustion chamber for combustion. Specifically, the exhaust gas and waste heat of the PEMFC stack are introduced into the closed combustion chamber through a pipeline, mixed with the introduced natural gas and air in the combustion chamber and then burned. The heat generated by the combustion is transferred to the outside of the SOFC stack through a heat exchanger, so that the external temperature of the SOFC stack reaches 580-620°C.

[0056] Step S203, introducing natural gas and air into the combustion chamber for combustion, further heating the outside of the SOFC stack to make the outside temperature of the SOFC stack reach 580-620° C.;

[0057] Preferably, the pressure regulation, temperature regulation and humidity regulation of the air specifically include:

[0058] Step S1021, the air is first pressurized to a set pressure by a compressor;

[0059] Step S1022, the pressure is reduced to a suitable pressure through a pressure reducing valve, and then the pressure is heated to 60-85°C by a heater;

[0060] Step S1023, then humidify through a humidification tank or directly enter the cathode pipeline of the PEMFC stack in the form of dry gas.

[0061] In step S2, after the PEMFC stack starts to generate electricity, the electric energy is directly used to heat the electric heating wire inside the SOFC stack, so that the internal temperature of the stack quickly rises to about 525°C. This method of directly using electric energy for heating has a fast response speed, can quickly increase the internal temperature of the SOFC stack, and shorten the startup time. The tail gas and two-way waste heat of the PEMFC stack are introduced into the closed combustion chamber for combustion, and are used for external heat exchange of the SOFC stack. The waste heat of the tail gas emitted by the PEMFC stack is fully utilized to improve the efficiency of energy utilization, and also helps to speed up the temperature rise rate outside the SOFC stack. After a series of treatments, the natural gas enters the combustion chamber for combustion and heat exchange, and works together with electric heating and tail gas waste heat to further increase the external temperature of the SOFC stack to about 600°C. The synergistic effect of multiple heating methods realizes the rapid heating of the inside and outside of the SOFC stack, greatly shortening the startup time of the SOFC stack.

[0062] Among them, the natural gas is desulfurized by a desulfurizer before entering the combustion chamber, reducing the sulfur content to less than 5ppm, effectively avoiding the corrosion and poisoning of sulfur on the SOFC stack electrodes and electrolyte materials, extending the service life of the SOFC stack and ensuring the long-term stable operation of the system.

[0063] Step S3, after the SOFC stack reaches 600-650° C., starting the SOFC stack to generate electricity, including:

[0064] Step S301, after decompression, desulfurization, heat exchange and flow control of natural gas, the natural gas is passed into the anode of the SOFC stack, wherein the temperature of the natural gas is adjusted to 550-600°C;

[0065] Step S302, after pressurizing, depressurizing, exchanging heat and performing secondary heating on the air, the air is passed into the cathode of the SOFC stack, wherein the air temperature is adjusted to 580-630° C.;

[0066] Step S303, when the temperature of the SOFC stack reaches 600-650°C, the natural gas and air are reacted in the SOFC stack to generate electricity, the tail gas generated by the power generation is introduced into the burner for combustion, and the combusted gas is returned to the inlet end heat exchanger;

[0067] Preferably, the natural gas is subjected to decompression, desulfurization, heat exchange and flow control treatments, specifically, the natural gas is passed through a pressure reducing valve to reduce the pressure to a set value, the sulfur component therein is removed through a desulfurizer, and then heat exchanged through a heat exchanger to make the natural gas temperature reach 550-600°C, and then water vapor is regulated through a water tank, and finally through a check valve to prevent gas backflow, and then enter the anode pipeline of the SOFC stack;

[0068] Furthermore, the air is pressurized, decompressed, heat-exchanged and reheated. Specifically, the air is first pressurized to a set pressure by a compressor, then decompressed to an appropriate pressure by a pressure reducing valve, then heat-exchanged by a heat exchanger, and then enters a closed combustion chamber, where it is reheated to 580-630°C by a coil, and finally enters the cathode pipeline of the SOFC stack.

[0069] In step S3, the natural gas enters the anode pipeline of the SOFC stack after the pressure is adjusted to 1.5 bar by the pressure reducing valve, desulfurized by the desulfurizer, the temperature is adjusted to 575°C by the heat exchanger, and the water vapor content is adjusted by the water tank. The above natural gas processing process ensures that the natural gas has suitable pressure, temperature and humidity when entering the stack, provides ideal conditions for the electrochemical reaction, and improves the power generation efficiency of the SOFC stack. The air is pressurized to 3.5 bar by the compressor, reduced to 1.5 bar by the pressure reducing valve, and heat exchanged to 450°C by the heat exchanger before entering the closed combustion chamber, and then heated to 600°C by the coil to enter the cathode pipeline of the stack. The above air processing process enables the air to participate in the electrochemical reaction under suitable conditions, fully react with the natural gas, and further improve the power generation efficiency of the SOFC stack.

[0070] Among them, the anode and cathode tail gas is burned in the burner and then returned to the inlet heat exchanger to complete the power generation cycle. The closed-loop system allows the internal energy and materials to be recycled, reduces the impact of external interference on the system, maintains the stable operation of the system, and improves the reliability and stability of the entire system. At the same time, the cyclic combustion of tail gas also makes full use of the residual energy in the tail gas, further improving the efficiency of energy utilization.

[0071] Working principle: First, during the startup phase of the PEMFC stack, the high-pressure hydrogen is reduced to 2 bar by the pressure reducing valve and then enters the heater to heat the hydrogen to 75°C. Subsequently, if humidification is selected, the relative humidity of the hydrogen reaches 65% through the humidification tank before entering the anode pipeline of the PEMFC stack; if dry gas is selected, it directly enters the anode pipeline. At the same time, the air is first pressurized to 3.5 bar by the compressor, and then decompressed to 1.5 bar by the pressure reducing valve before entering the heater to heat the air to 75°C. If humidification is performed, the relative humidity of the air reaches 55% before entering the cathode pipeline of the PEMFC stack; if it is in the form of dry gas, it directly enters the cathode pipeline. After the cooling water circuit is pressurized to 4.5 bar by the water pump, it passes through the heater (raising the water temperature to 50°C) and the heat exchanger (ensuring that the water temperature is stable at 50°C) in turn, and then enters the cooling water circuit of the stack. After a 10-minute heating process, the PEMFC stack has the ability to generate electricity and begins to generate electricity normally. Next, the SOFC stack is heated by electric-thermal coupling. An electric heating wire is pre-buried inside the SOFC stack connector. When the PEMFC stack starts to generate electricity, the generated electricity is directly transmitted to the heating wire of the SOFC stack. The heating wire is energized and heated to heat the inside of the SOFC stack, gradually raising the temperature inside the SOFC stack to 525°C. At the same time, the exhaust gas (including unreacted hydrogen and air) emitted by the PEMFC stack and the two-way waste heat are introduced into the closed combustion chamber for combustion. The heat released by the combustion is used to heat the outside of the SOFC stack, gradually raising the temperature outside the SOFC stack to 525°C. In addition, the natural gas enters the combustion chamber after the pressure is adjusted to 1.5 bar by the pressure reducing valve, desulfurized by the desulfurizer (to reduce the sulfur content to less than 5 ppm), heat exchanged by the heat exchanger (to increase the temperature of the natural gas to 450°C), and the check valve prevents backflow. The air is also pressurized to 3.5 bar by the compressor, reduced to 1.5 bar by the pressure reducing valve, heat exchanged by the heat exchanger (to increase the air temperature to 450°C), and then enters the combustion chamber for combustion and heat exchange, further raising the external temperature of the SOFC stack to 600°C. The three heating methods of electric heating, PEMFC tail gas waste heat and combustion heat exchange, and natural gas combustion heat exchange work together to accelerate the heating of the inside and outside of the SOFC stack to 625°C. Finally, when the temperature of the SOFC stack reaches 625°C, the SOFC stack starts.At this time, the natural gas enters the anode pipeline of the SOFC stack after passing through the pressure reducing valve (reducing the pressure to 1.5 bar), desulfurizer (making the sulfur content lower than 5 ppm), heat exchanger (adjusting the natural gas temperature to 575°C), water tank (adjusting the water vapor content of the natural gas to make the water-carbon ratio 2.5) and check valve. The air enters the closed combustion chamber after being pressurized to 3.5 bar by the compressor, reduced to 1.5 bar by the pressure reducing valve, and heat exchanged by the heat exchanger (raising the air temperature to 450°C). It is then heated again by the coil (making the air temperature reach 600°C) and then enters the cathode pipeline of the stack. Inside the SOFC stack, natural gas and air react to generate electricity. The cathode and anode tail gases generated during the power generation process are burned by the burner and returned to the heat exchanger at the inlet end, thus completing the entire power generation cycle. Through the thermoelectric coupling method, the rapid startup and stable operation of the PEMFC-SOFC system are achieved.

[0072] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0073] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A SOFC quick start method based on PEMFC assisted electric and thermal coupling, characterized in that: The following steps are involved: Step S1, starting the PEMFC stack to enable it to have power generation capability; Step S2, heating the SOFC stack through the power output and tail gas emission of the PEMFC stack; Step S3, after the SOFC stack reaches 600-650° C., start the SOFC stack to generate electricity.

2. The SOFC quick start method based on PEMFC auxiliary electric and thermal coupling according to claim 1, characterized in that: In step S1, the step of starting the PEMFC stack to enable it to have power generation capability includes: Step S101, after the hydrogen is subjected to pressure, temperature and humidity adjustment, it is passed into the anode of the PEMFC stack, wherein the temperature of the hydrogen is adjusted to 60-85° C.; Step S102, after adjusting the pressure, temperature and humidity of the air, the air is passed into the cathode of the PEMFC stack, wherein the air temperature is adjusted to 60-85° C.; Step S103, after pressurizing, heating and heat exchange treatment of the cooling water channel, it enters the cooling channel of the PEMFC stack, and after 10 minutes, the PEMFC stack starts to generate electricity.

3. The SOFC quick start method based on PEMFC auxiliary electric and thermal coupling according to claim 2, characterized in that: In step S2, the step of heating the SOFC stack by means of the power output and tail gas emission of the PEMFC stack includes: Step S201, transmitting the electric energy generated by the PEMFC stack to the heating element disposed inside the SOFC stack to increase the temperature inside the SOFC stack; Step S202, introducing the exhaust gas emitted by the PEMFC stack into the combustion chamber for combustion, and using the heat generated by the combustion to heat the outside of the SOFC stack, so that the temperature of the outside of the SOFC stack gradually increases to 500-550° C.; Step S203, introducing natural gas and air into the combustion chamber for combustion, further heating the outside of the SOFC stack so that the external temperature of the SOFC stack reaches 580-620°C.

4. The SOFC quick start method based on PEMFC auxiliary electric and thermal coupling according to claim 3, characterized in that: In step S3, after the SOFC stack reaches a specific temperature condition, the step of starting the SOFC stack to generate electricity includes: Step S301, after decompression, desulfurization, heat exchange and flow control of natural gas, the natural gas is passed into the anode of the SOFC stack, wherein the temperature of the natural gas is adjusted to 550-600°C; Step S302, after pressurizing, depressurizing, exchanging heat and performing secondary heating on the air, the air is passed into the cathode of the SOFC stack, wherein the air temperature is adjusted to 580-630° C.; Step S303, when the temperature of the SOFC stack reaches 600-650°C, the natural gas and air react in the SOFC stack to generate electricity, the tail gas generated by the power generation is introduced into the burner for combustion, and the combusted gas is returned to the inlet end heat exchanger.

5. The SOFC quick start method based on PEMFC auxiliary electric and thermal coupling according to claim 2, characterized in that: In step S101, the pressure regulation, temperature regulation and humidity regulation of hydrogen specifically include: Step S1011, the high-pressure hydrogen first passes through a pressure reducing valve to reduce the pressure to a set value; Step S1012, then enter the heater to raise the temperature to 60-85°C; Step S1013, then humidify through a humidification tank or directly enter the anode pipeline of the PEMFC stack in the form of dry gas.

6. The SOFC quick start method based on PEMFC auxiliary electric and thermal coupling according to claim 2, characterized in that: In step S102, the pressure regulation, temperature regulation and humidity regulation of the air specifically include: Step S1021, the air is first pressurized to a set pressure by a compressor; Step S1022, the pressure is reduced to a suitable pressure through a pressure reducing valve, and then the pressure is heated to 60-85°C by a heater; Step S1023, then humidify through a humidification tank or directly enter the cathode pipeline of the PEMFC stack in the form of dry gas.

7. The SOFC quick start method based on PEMFC auxiliary electric and thermal coupling according to claim 3, characterized in that: In the step S201, the electric energy generated by the PEMFC stack is transmitted to the heating element provided inside the SOFC stack. Specifically, the electric energy generated by the PEMFC stack is connected to the heating wire pre-buried inside the SOFC stack through a wire. The heating wire generates heat under the action of the electric energy, so that the internal temperature of the SOFC stack gradually increases to 500-550°C.

8. The SOFC quick start method based on PEMFC auxiliary electric and thermal coupling according to claim 3, characterized in that: In step S202, the exhaust gas emitted by the PEMFC stack is introduced into the combustion chamber for combustion. Specifically, the exhaust gas and waste heat of the PEMFC stack are introduced into the closed combustion chamber through a pipeline, mixed with the introduced natural gas and air in the combustion chamber and then burned. The heat generated by the combustion is transferred to the outside of the SOFC stack through a heat exchanger, so that the external temperature of the SOFC stack reaches 580-620°C.

9. The SOFC quick start method based on PEMFC auxiliary electric and thermal coupling according to claim 4, characterized in that: The step S301 is to perform pressure reduction, desulfurization, heat exchange and flow control on the natural gas. Specifically, the natural gas is passed through a pressure reducing valve to reduce the pressure to a set value, the sulfur component is removed through a desulfurizer, and then heat is exchanged through a heat exchanger to make the natural gas temperature reach 550-600°C. After that, the water vapor is adjusted through a water tank, and finally the gas is passed through a check valve to prevent backflow of the gas, and then enters the anode pipeline of the SOFC stack.

10. The SOFC quick start method based on PEMFC auxiliary electric and thermal coupling according to claim 4, characterized in that: The step S302, pressurizing, decompressing, heat exchanging and secondary heating the air, specifically, the air is first pressurized to a set pressure by a compressor, then decompressed to a suitable pressure by a pressure reducing valve, then heat exchanged by a heat exchanger, then enters a closed combustion chamber, and is secondary heated to 580-630°C by a coil, and finally enters the cathode pipeline of the SOFC stack.

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