Solid oxide fuel cell coupled with organic rankine cycle power generation system

Abstract

The application discloses a solid oxide fuel cell and organic Rankine cycle device coupled power generation system, which comprises a solid oxide fuel cell, a cathode inlet of which is connected with an external air source; a fuel preheater, a primary side of which is connected with an external fuel gas source and an anode inlet of the solid oxide fuel cell respectively, and a secondary side inlet of which is connected with an anode tail gas outlet of the solid oxide fuel cell; a burner, an inlet of which is connected with a secondary side outlet of the fuel preheater and a cathode tail gas outlet of the solid oxide fuel cell respectively; and an organic Rankine cycle device, which is connected with an outlet of the burner, so that waste heat of anode tail gas and cathode tail gas of the solid oxide fuel cell is utilized, and overall energy utilization rate is improved; and the anode tail gas is made to pass through the fuel preheater before entering the burner, so that fuel gas supplied to the anode of the solid oxide fuel cell is preheated, external fuel consumption is reduced, and waste heat of the anode tail gas of the solid oxide fuel cell is further utilized.

Description

Technical Field

[0001] This application relates to the field of power generation system technology, and in particular to a power generation system coupled with a solid oxide fuel cell and an organic Rankine cycle device. Background Technology

[0002] Solid oxide fuel cells (SOFCs), as a novel and highly efficient energy device, directly convert chemical energy into electrical energy through the electrochemical reaction of gas and air under high-temperature conditions. Their conversion efficiency is significantly superior to traditional gas internal combustion engines and gas micro-engines, among other distributed energy generation methods. SOFCs not only have wide fuel adaptability, utilizing various types of gas, but also offer the environmental advantage of low pollutant emissions, making them suitable for various distributed energy supply scenarios such as buildings, hospitals, residences, and isolated islands. However, the high-temperature flue gas generated during SOFC power generation still maintains a temperature of 150-220℃. Direct emission of this gas would lead to a significant waste of low-grade heat energy, impacting overall energy utilization efficiency.

[0003] Therefore, existing technologies still need to be improved and developed. Utility Model Content

[0004] The technical problem to be solved by this application is to provide a power generation system coupled with a solid oxide fuel cell and an organic Rankine cycle device, which aims to improve energy utilization efficiency, in order to address the above-mentioned deficiencies of the prior art.

[0005] The technical solution adopted by this application to solve the technical problem is as follows: A solid oxide fuel cell coupled with an organic Rankine cycle power generation system, comprising: Solid oxide fuel cells have their cathode inlet connected to an external air source. The fuel preheater has its primary side connected to an external gas source and the anode inlet of the solid oxide fuel cell, and its secondary side inlet connected to the anode exhaust outlet of the solid oxide fuel cell. The burner has its inlet connected to the secondary side outlet of the fuel preheater and the cathode exhaust outlet of the solid oxide fuel cell, respectively. An organic Rankine cycle device is connected to the outlet of the burner.

[0006] The solid oxide fuel cell coupled with the organic Rankine cycle power generation system further includes: The air preheater has its primary side connected to an external air source and the cathode inlet of the solid oxide fuel cell, and its secondary side connected to the outlet of the burner and the organic Rankine cycle device.

[0007] The solid oxide fuel cell coupled with the organic Rankine cycle power generation system further includes: The gas-water-steam reforming unit is connected to an external water source, the primary side of the fuel preheater, and the anode inlet of the solid oxide fuel cell, respectively, to perform gas-water-steam reforming.

[0008] The solid oxide fuel cell coupled with the organic Rankine cycle power generation system includes a gas steam reforming unit comprising: A steam generator is connected to an external water source and the primary inlet of the fuel preheater, respectively. The reformer is connected to the primary side outlet of the fuel preheater and the anode inlet of the solid oxide fuel cell, respectively.

[0009] The solid oxide fuel cell is coupled to an organic Rankine cycle power generation system, wherein the reformer is connected to the burner.

[0010] The solid oxide fuel cell coupled with the organic Rankine cycle device in the power generation system, wherein the steam generator includes: The steam generator heat exchanger has its primary side connected to an external water source and the primary inlet of the fuel preheater, and its secondary side connected to the burner and the organic Rankine cycle device.

[0011] The solid oxide fuel cell coupled with the organic Rankine cycle device to generate electricity, wherein the organic Rankine cycle device includes: Expander; The condenser, whose primary inlet is connected to the expander; A working fluid pump is connected to the primary side outlet of the condenser; The evaporator has its primary inlet connected to the working fluid pump, its primary outlet connected to the expander, and its secondary inlet connected to the secondary outlet of the steam heat exchanger.

[0012] The solid oxide fuel cell is coupled to an organic Rankine cycle device to generate electricity, wherein the solid oxide fuel cell is a planar solid oxide fuel cell.

[0013] The solid oxide fuel cell coupled with the organic Rankine cycle power generation system further includes: The first inverter is connected to the solid oxide fuel cell.

[0014] The solid oxide fuel cell coupled with the organic Rankine cycle power generation system further includes: The second inverter is connected to the organic Rankine cycle device.

[0015] Beneficial Effects: In this application, the exhaust gases generated at the cathode and anode of a solid oxide fuel cell are combusted in a burner, significantly increasing the exhaust gas temperature. This further releases the chemical energy in the anode and cathode exhaust gases into heat energy, improving the temperature level and quality of low-grade heat energy, making it more suitable for driving the vaporization of the organic working fluid in an organic Rankine cycle device. This not only allows the exhaust gases from the solid oxide fuel cell to be utilized but also increases the total heat transferred to the organic Rankine cycle device, improving the overall system thermal efficiency. Simultaneously, by maximizing the release of chemical and heat energy from the cathode and anode exhaust gases through the burner for power generation in the organic Rankine cycle device, the overall system efficiency is significantly improved, fuel consumption is reduced, economic benefits are enhanced, and the stable output and efficient operation of the organic Rankine cycle device are ensured.

[0016] In this application, the fuel gas is preheated by a fuel preheater before being supplied to the anode of the solid oxide fuel cell by an external fuel gas source. To further utilize the waste heat of the anode exhaust gas, the anode exhaust gas passes through a fuel preheater before entering the burner, thereby preheating the fuel gas supplied to the anode of the solid oxide fuel cell, reducing external fuel consumption, further effectively utilizing the waste heat of the anode exhaust gas of the solid oxide fuel cell, and improving the overall energy efficiency of the system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the solid oxide fuel cell coupled with the organic Rankine cycle device in this application. Detailed Implementation

[0018] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or wireless coupling. The term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

[0019] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0020] The inventors of this application discovered through research that solid oxide fuel cells operate at high temperatures (typically 600℃~900℃). Although the electrochemical reaction converts some chemical energy into electrical energy, the emitted cathode and anode exhaust gases still maintain relatively high temperatures (generally, cathode exhaust gas is about 150~220℃, and anode exhaust gas temperature depends on the system design). These high-temperature gases contain a large amount of thermal energy. Although the exhaust gas temperature is high, it is significantly lower than the high-temperature heat source required for power generation, and thus belongs to low-grade thermal energy. Traditional boilers or heat exchange equipment are generally designed for high-temperature heat sources, but the low-grade thermal energy emitted by solid oxide fuel cells is difficult to generate a sufficient temperature difference to drive heat exchange. Therefore, traditional boilers or heat exchange equipment cannot efficiently recover and convert it into useful energy (such as steam or electrical energy). Consequently, the prior art directly emits the exhaust gases generated by the anode and cathode of solid oxide fuel cells, reducing the overall energy utilization efficiency.

[0021] To address the aforementioned technical problems, this application provides a power generation system coupled with a solid oxide fuel cell and an organic Rankine cycle device, such as... Figure 1 As shown ( Figure 1 The solid oxide fuel cell coupled with the organic Rankine cycle device (the middle arrow indicates the working fluid flow direction) power generation system includes: solid oxide fuel cell 1, fuel preheater 2, burner 3 and organic Rankine cycle device 4; the cathode inlet of solid oxide fuel cell 1 is connected to an external air source; the primary side of fuel preheater 2 is connected to an external gas source and the anode inlet of solid oxide fuel cell 1 respectively, and the secondary side inlet of fuel preheater 2 is connected to the anode exhaust outlet of solid oxide fuel cell 1; the inlet of burner 3 is connected to the secondary side outlet of fuel preheater 2 and the cathode exhaust outlet of solid oxide fuel cell 1 respectively, and the organic Rankine cycle device 4 is connected to the outlet of burner 3.

[0022] Specifically, the solid oxide fuel cell 1 has a cathode and an anode. Its cathode inlet is connected to an external air source, and its cathode exhaust outlet is connected to a burner 3, thus supplying the cathode exhaust gas to the burner 3, where it is heated by combustion before being discharged. The primary side of the fuel preheater 2 is connected to both an external gas source and the anode inlet of the solid oxide fuel cell 1, while the secondary side is connected to both the anode exhaust outlet of the solid oxide fuel cell 1 and the burner 3. This not only supplies the anode exhaust gas to the burner 3 for heating and discharge but also allows for preheating of the gas supplied to the anode of the solid oxide fuel cell 1 using the high-temperature waste heat of the anode exhaust gas, thus raising the gas temperature before it enters the anode of the solid oxide fuel cell 1. The gas heated by combustion in the burner 3 then enters the organic Rankine cycle device 4 for utilization, thereby improving overall energy efficiency.

[0023] In this application, the exhaust gases generated at the cathode and anode of the solid oxide fuel cell 1 are combusted by burner 3, significantly increasing the exhaust gas temperature. This further releases the chemical energy in the anode and cathode exhaust gases into heat energy, improving the temperature level and quality of the low-grade heat energy, making it more suitable for driving the vaporization of the organic working fluid in the organic Rankine cycle device 4. This not only allows the exhaust gases from the solid oxide fuel cell 1 to be utilized but also increases the total heat transferred to the organic Rankine cycle device 4, improving the overall system thermal efficiency. Simultaneously, by maximizing the release of chemical and heat energy from the cathode and anode exhaust gases through burner 3 for power generation in the organic Rankine cycle device, the overall system efficiency is significantly improved, fuel consumption is reduced, economic benefits are enhanced, and the stable output and efficient operation of the organic Rankine cycle device are guaranteed.

[0024] The solid oxide fuel cell 1 operates at a high internal temperature, where the fuel undergoes a chemical reaction with the electrolyte at the anode. If the gas temperature is too low, the initial reaction rate will be slow, resulting in low fuel conversion and reduced power generation efficiency. Therefore, in this application, the gas is preheated by a fuel preheater 2 before being supplied to the anode of the solid oxide fuel cell 1 by an external gas source. Since the anode exhaust gas of the solid oxide fuel cell 1 has a high temperature, to further utilize the waste heat of the anode exhaust gas, this application connects the secondary side inlet of the fuel preheater 2 to the anode exhaust gas outlet of the solid oxide fuel cell 1, and connects the secondary side outlet of the fuel preheater 2 to the inlet of the burner 3. Thus, the anode exhaust gas passes through the fuel preheater 2 before entering the burner 3, thereby preheating the gas supplied to the anode of the solid oxide fuel cell 1, reducing external fuel consumption, further effectively utilizing the waste heat of the anode exhaust gas of the solid oxide fuel cell 1, and improving the overall energy efficiency of the system.

[0025] In one embodiment of this application, the solid oxide fuel cell coupled with the organic Rankine cycle device power generation system further includes an air preheater 5. The primary side of the air preheater 5 is connected to an external air source and the cathode inlet of the solid oxide fuel cell 1, respectively, and the secondary side of the air preheater 5 is connected to the outlet of the burner 3 and the organic Rankine cycle device 4, respectively.

[0026] Specifically, the air preheater 5 is used to preheat the air entering the cathode of the solid oxide fuel cell 1, increasing its temperature and making the reaction of the solid oxide fuel cell 1 more efficient, thereby improving the overall performance and efficiency of the solid oxide fuel cell 1. Furthermore, the high temperature generated after the combustion of the cathode and anode exhaust gases by the burner 3 is used to exchange heat with the air in the air preheater 5, reducing external fuel consumption and further effectively utilizing the waste heat from the anode and cathode exhaust gases of the solid oxide fuel cell 1, thus improving energy utilization.

[0027] In one embodiment of this example, a blower 8 is also connected between the air preheater 5 and the external air source.

[0028] In one embodiment of this application, the solid oxide fuel cell coupled with the organic Rankine cycle device power generation system further includes a gas-water steam reforming device, which is connected to an external water source, the primary side of the fuel preheater 2 and the anode inlet of the solid oxide fuel cell 1, respectively, to perform gas-water steam reforming.

[0029] Specifically, the electrochemical reaction at the anode of the solid oxide fuel cell 1 mainly consumes hydrogen and carbon monoxide, while commonly used fuel gas mainly contains hydrocarbons, which cannot directly and efficiently participate in the reaction. Therefore, in this application, before the fuel gas enters the anode of the solid oxide fuel cell 1, it is necessary to perform steam reforming to convert hydrocarbons into hydrogen and carbon monoxide, thereby improving fuel utilization and battery output power.

[0030] It should be noted that the gas-water vapor reforming device in this application is not only used for reforming gas and water vapor, but also for evaporating water at high temperature to generate water vapor, which is then combined with the gas before the gas is preheated; that is, the water vapor and gas are combined in the gas-water vapor reforming device before entering the fuel preheater 2 for preheating, so as to avoid the sudden temperature change caused by direct contact between the preheated high-temperature gas and the relatively cold water vapor, as well as the local overheating or decomposition of the water vapor; the pre-mixing and joint preheating results in a more uniform temperature change and better protects the safety of subsequent equipment.

[0031] In one embodiment of this example, the gas steam reforming device includes a steam generator and a reformer 7; the steam generator is connected to an external water source and the primary inlet of the fuel preheater 2, and the reformer 7 is connected to the primary outlet of the fuel preheater 2 and the anode inlet of the solid oxide fuel cell 1.

[0032] Specifically, the steam generator is connected to an external water source and exchanges heat with the water to generate steam. The steam generator is also connected to the primary side inlet of the fuel preheater 2, thus providing steam to the primary side of the fuel preheater 2 and allowing the steam to combine with the fuel gas before preheating. The reformer 7 is located between the fuel preheater 2 and the anode of the solid oxide fuel cell 1, and is connected to both the primary side outlet of the fuel preheater 2 and the anode inlet of the solid oxide fuel cell 1. Through the reaction of steam with the fuel gas, it generates a large amount of hydrogen and carbon monoxide, improving the quality of the fuel gas and the power generation efficiency. This helps to improve the electrochemical performance of the anode reaction in the solid oxide fuel cell 1 and enhances the overall system efficiency.

[0033] It should be noted that the steam reforming reaction in the reformer 7 is an endothermic reaction and requires heating. In this application, the reformer 7 is connected to the burner 3, and the exhaust gas after combustion in the burner 3 is used as a heat source to provide the required heat to the reformer 7, avoiding the need for additional heating equipment, further reducing fuel consumption and operating costs, and improving thermal utilization.

[0034] In one embodiment of this application, the steam generator includes a steam generating heat exchanger 6. The primary side of the steam generating heat exchanger 6 is connected to an external water source and the primary inlet of the fuel preheater 2, respectively. The secondary side of the steam generating heat exchanger 6 is connected to a burner 3 and an organic Rankine cycle device 4, respectively.

[0035] Specifically, the primary inlet of the steam generating heat exchanger 6 is connected to an external water source, and the primary outlet of the steam generating heat exchanger 6 is connected to the primary inlet of the fuel preheater 2; the secondary inlet of the steam generating heat exchanger 6 is connected to the secondary outlet of the air preheater 5, and the secondary outlet of the steam generating heat exchanger 6 is connected to the organic Rankine cycle device 4.

[0036] In this application, the anode exhaust gas of the solid oxide fuel cell 1 enters the burner 3 after passing through the fuel preheater 2, and the cathode exhaust gas of the solid oxide fuel cell 1 enters the burner 3. After the burner 3 burns the anode exhaust gas and the cathode exhaust gas, it first preheats the exhaust gas with the air in the air preheater 5, and then supplies the exhaust gas to the steam generator heat exchanger 6 to exchange heat with water to generate steam, and finally discharges it to the organic Rankine cycle device 4.

[0037] The anode exhaust gas temperature of the solid oxide fuel cell 1 reaches as high as 720°C. After passing through the fuel preheater 2, it is cooled to 450°C. The flue gas exiting the burner 3 is 760°C, which is reduced to 440°C after passing through the air preheater 5. It is further reduced to 220°C after heat exchange in the steam generator heat exchanger 6, and finally reduced to 60°C through the organic Rankine cycle device 4. Since both the anode exhaust gas and the flue gas exiting the burner 3 are high-temperature heat sources, this system does not directly and drastically reduce the exhaust gas temperature to 60°C. Instead, it performs staged heat exchange on various fluids according to different temperature ranges, avoiding direct and large-scale heat loss and achieving graded temperature utilization.

[0038] Therefore, this application achieves tiered waste heat recovery by utilizing tail gas heat energy in different temperature ranges, avoiding the waste of heat energy caused by a one-time large-scale cooling, and improving the system's thermal efficiency and power generation efficiency. Tiered temperature utilization not only meets the needs of various processes such as fuel preheating, air preheating, and steam generation, but also fully leverages the electrical energy conversion capability of the organic Rankine cycle unit 4 for low-temperature waste heat, achieving dual optimization of economy and environmental protection.

[0039] In this application, the organic Rankine cycle device 4 includes an expander 41, a condenser 42, a working fluid pump 43, and an evaporator 44; the primary inlet of the condenser 42 is connected to the expander 41, the working fluid pump 43 is connected to the primary outlet of the condenser 42, the primary inlet of the evaporator 44 is connected to the working fluid pump 43, the primary outlet of the evaporator 44 is connected to the expander 41, and the secondary inlet of the evaporator 44 is connected to the secondary outlet of the steam generating heat exchanger 6.

[0040] Specifically, the expander 41, condenser 42, working fluid pump 43 and evaporator 44 are connected in series along the working fluid flow direction to form a circulating flow path; the primary side of the evaporator 44 is located in this circulating flow path, and the secondary side of the evaporator 44 is connected to the burner 3 through a steam generator heat exchanger 6, thereby utilizing the waste heat of the anode and cathode exhaust gases generated by the solid oxide fuel cell 1 to improve the overall energy efficiency of the system.

[0041] In one embodiment of this application, the solid oxide fuel cell 1 is a planar solid oxide fuel cell. Planar solid oxide fuel cells are compact, easy to manufacture and modularly integrate, and operate under slightly positive pressure conditions. Combined with a gas steam reforming device, the single-cell power generation efficiency can reach 60%. The rated power output of the planar solid oxide fuel cell 1 is 100 kW, and the gas flow rate at the anode inlet is 15.4 m³ / h. 3The exhaust flow rate is 0.16 kg / s, and the temperature after passing through the steam generator heat exchanger 6 is approximately 200°C. The working fluid in the organic Rankine cycle unit 4 is R141b, with an evaporation temperature of 140°C and a condensation temperature of 35°C. Experiments show that the organic Rankine cycle unit 4 can output an additional 7 kW of electricity, based on the natural gas calorific value of 35 MJ / Nm³. 3 According to calculations, after the anode tail gas and cathode tail gas enter the organic Rankine cycle device 4, they achieve efficient recovery and power conversion of low-grade preheating, improving the overall system power generation efficiency to 69%.

[0042] It should be noted that the organic Rankine cycle device 4 in this application adopts a single-stage structure. The temperature of the exhaust gas after heat exchange in the steam generator heat exchanger 6 reaches 220°C, that is, the temperature of the exhaust gas entering the organic Rankine cycle device 4 reaches 220°C; according to the temperature of the heat source, R141b is selected as the working fluid in the organic Rankine cycle device 4, and the single-stage organic Rankine cycle device 4 can achieve a high energy efficiency.

[0043] The solid oxide fuel cell coupled with the organic Rankine cycle device power generation system also includes a first inverter 9 and a second inverter 10; the first inverter 9 is connected to the solid oxide fuel cell 1, and the second inverter 10 is connected to the organic Rankine cycle device 4.

[0044] Specifically, the solid oxide fuel cell 1 outputs direct current (DC), while the daily power grid and most household or industrial equipment use alternating current (AC). Therefore, the solid oxide fuel cell 1 is connected to the first inverter 9 to convert the DC power to AC power output. In the organic Rankine cycle device 4, due to the efficiency and voltage mismatch between the output power of the expander 41 and the grid demand, the expander 41 of the organic Rankine cycle device 4 is connected to the second inverter 10 for conversion and regulation.

[0045] In summary, this application provides a power generation system coupled with a solid oxide fuel cell and an organic Rankine cycle device, comprising: a solid oxide fuel cell, the cathode inlet of which is connected to an external air source; a fuel preheater, the primary side of which is connected to an external gas source and the anode inlet of the solid oxide fuel cell, and the secondary side inlet of which is connected to the anode exhaust outlet of the solid oxide fuel cell; a burner, the inlet of which is connected to the secondary side outlet of the fuel preheater and the cathode exhaust outlet of the solid oxide fuel cell; and an organic Rankine cycle device connected to the outlet of the burner. In this application, the exhaust gases generated by the cathode and anode of the solid oxide fuel cell are burned by the burner, significantly increasing the exhaust gas temperature. This further releases the chemical energy in the anode and cathode exhaust gases into heat energy, improving the temperature level and quality of the low-grade heat energy, making it more suitable for driving the vaporization of the organic working fluid in the organic Rankine cycle device. This not only allows the exhaust gas discharged from the solid oxide fuel cell to be utilized, but also increases the total heat transferred to the organic Rankine cycle device, improving the thermal efficiency of the entire system. Simultaneously, by maximizing the release of chemical and thermal energy from the cathode and anode exhaust gases through the burner and utilizing them for power generation in the Meckelken cycle unit, the overall system efficiency is significantly improved, fuel consumption is reduced, economic benefits are enhanced, and the stable output and efficient operation of the Meckelken cycle unit are ensured. Furthermore, in this application, the fuel gas is preheated by a fuel preheater before being supplied to the anode of the solid oxide fuel cell by an external fuel source. To further fully utilize the waste heat of the anode exhaust gas, the anode exhaust gas passes through a fuel preheater before entering the burner, thereby preheating the fuel gas supplied to the anode of the solid oxide fuel cell, reducing external fuel consumption, further effectively utilizing the waste heat of the anode exhaust gas of the solid oxide fuel cell, and improving the overall energy efficiency of the system.

[0046] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A power generation system coupled with a solid oxide fuel cell and an organic Rankine cycle device, characterized in that, It includes: Solid oxide fuel cells have their cathode inlet connected to an external air source. The fuel preheater has its primary side connected to an external gas source and the anode inlet of the solid oxide fuel cell, and its secondary side inlet connected to the anode exhaust outlet of the solid oxide fuel cell. The burner has its inlet connected to the secondary side outlet of the fuel preheater and the cathode exhaust outlet of the solid oxide fuel cell, respectively. An organic Rankine cycle device is connected to the outlet of the burner.

2. The system of claim 1, wherein the system further comprises a heat exchanger. It also includes: The air preheater has its primary side connected to an external air source and the cathode inlet of the solid oxide fuel cell, and its secondary side connected to the outlet of the burner and the organic Rankine cycle device.

3. The system of claim 2, wherein the system further comprises a heat exchanger. It also includes: The gas-water-steam reforming unit is connected to an external water source, the primary side of the fuel preheater, and the anode inlet of the solid oxide fuel cell, respectively, to perform gas-water-steam reforming.

4. The system of claim 3, wherein the system further comprises a heat exchanger disposed between the SOFC and the ORC. The gas-fired steam reforming device includes: A steam generator is connected to an external water source and the primary inlet of the fuel preheater, respectively. The reformer is connected to the primary side outlet of the fuel preheater and the anode inlet of the solid oxide fuel cell, respectively.

5. The system of claim 4, wherein the system further comprises a heat exchanger. The reformer is connected to the burner.

6. The system of claim 4, wherein the system further comprises a heat exchanger. The steam generator includes: The steam generator heat exchanger has its primary side connected to an external water source and the primary inlet of the fuel preheater, and its secondary side connected to the burner and the organic Rankine cycle device.

7. The solid oxide fuel cell coupled with an organic Rankine cycle power generation system according to claim 6, characterized in that, The organic Rankine cycle device includes: Expander; The condenser, whose primary inlet is connected to the expander; A working fluid pump is connected to the primary side outlet of the condenser; The evaporator has its primary inlet connected to the working fluid pump, its primary outlet connected to the expander, and its secondary inlet connected to the secondary outlet of the steam heat exchanger.

8. The system of claim 1, wherein the system further comprises a heat exchanger. The solid oxide fuel cell is a planar solid oxide fuel cell.

9. The system of claim 1, wherein the system further comprises a heat exchanger. It also includes: The first inverter is connected to the solid oxide fuel cell.

10. The system of claim 1, wherein the system further comprises a heat exchanger. It also includes: The second inverter is connected to the organic Rankine cycle device.

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