SOFC system combined with Stirling engine

Abstract

The utility model discloses a solid oxide fuel cell (SOFC) system combined with a Stirling engine, and belongs to the technical field of SOFC systems. The device comprises an SOFC electric pile, the SOFC electric pile comprises a fuel input end, an air input end and a tail gas output end, the fuel input end is connected with a reformer, the air input end is connected with an air pump, and the tail gas output end is connected into a combustor of a Stirling engine; the air pump is divided into two paths to be connected into the air input end, one path is connected into the air input end after passing through the heat dissipation end of the Stirling engine, and the other path is directly connected into the air input end; and waste gas generated by the Stirling engine is introduced into the reformer to provide heat for the reformer. According to the utility model, tail gas generated by the SOFC electric pile is introduced into the Stirling engine for direct combustion, so that energy waste is avoided, meanwhile, the control valve is arranged for shunting air, the flow of air in different paths is controlled to control the power of the system, and energy is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of SOFC systems, and more specifically to a SOFC system combined with a Stirling engine. Background Art

[0002] Solid Oxide Fuel Cell (SOFC) is a high-temperature fuel cell that uses solid oxide as an electrolyte and can directly convert chemical energy into electrical energy. SOFC has the advantages of high efficiency, low emissions, fuel flexibility, etc., and has broad application prospects in the energy field. The working principle of SOFC is that reduction reaction and oxidation reaction occur on the anode and cathode sides respectively, and electrons generate current through the external circuit. The operating temperature range of SOFC is 650-800 degrees Celsius, and the energy utilization efficiency is higher than that of proton exchange membrane hydrogen fuel cells, but due to the high exhaust gas emission temperature, the energy loss problem of solid oxide fuel cell system is also more serious.

[0003] Since the working temperature of SOFC is relatively high, it is often necessary to heat the fuel and air in advance when starting. The existing technology generally heats the SOFC reformer first, and then uses the exhaust gas emitted by SOFC to preheat the fuel and air. However, simple heat exchange cannot make good use of the waste heat in the exhaust gas, and the residual chemical energy in the exhaust gas is not well utilized. At the same time, simply heating the fuel and air cannot accurately control the working efficiency of SOFC.

[0004] After searching, Chinese patent document CN1375627A discloses a composite energy generating device, in which a solid electrolyte fuel cell is arranged between the air channel for supplying air to the heater of the Stirling engine and the fuel channel for supplying fuel. The solid electrolyte fuel cell reacts air and fuel to generate electrical energy, and the stack exhaust gas containing unreacted sludge discharged by the solid electrolyte fuel cell is supplied to the heater of the Stirling engine to make it burn catalytically, and the heat of the fuel cell activates the Stirling engine to generate mechanical energy. The solid electrolyte fuel cell is annular in shape and is arranged to surround the heater. The reaction heat generated by the solid electrolyte fuel cell acts on the heater, which can increase the temperature of the heater. In this way, mechanical energy and electrical energy can be generated efficiently. However, in this application, the exhaust gas of the fuel cell is burned and then passed into the Stirling engine to generate mechanical energy, that is, the high-temperature exhaust gas generated by the burner is used to generate electricity. However, when the exhaust gas is burned in this way, heat will inevitably be lost through radiation or air convection during the flow process, thereby limiting the energy utilization efficiency of the system. Summary of the invention

[0005] 1. Technical problems to be solved by the utility model

[0006] In view of the problem that the exhaust gas cannot be fully utilized in the existing SOFC exhaust gas utilization scheme, resulting in the heat of the combustion exhaust gas being lost through radiation or air convection during the flow process, the utility model provides a SOFC system combined with a Stirling engine, which avoids heat loss by directly introducing the exhaust gas generated by the SOFC system into the Stirling engine.

[0007] Furthermore, in order to solve the problem that the power of SOFC and Stirling engine cannot be controlled when the Stirling engine is combined, the utility model controls the heat of SOFC and Stirling engine by air diversion, thereby controlling the power of the system.

[0008] 2. Technical solution

[0009] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is:

[0010] The utility model discloses a SOFC system combined with a Stirling engine, comprising a SOFC stack, wherein the SOFC stack comprises a fuel input end, an air input end and an exhaust gas output end, wherein the fuel input end is connected to a reformer, the air input end is connected to an air pump, and the exhaust gas output end is connected to a burner of the Stirling engine; the air pump is connected to the air input end in two ways, one way is connected to the air input end after passing through a heat dissipation end of the Stirling engine, and the other way is connected to the air input end; the exhaust gas generated by the Stirling engine is connected to the reformer to provide heat for the reformer.

[0011] Furthermore, a control valve is provided at the outlet of the air pump to control the air flow rate in the two passages connected to the air input end.

[0012] Furthermore, a second heat exchanger is provided between the tail gas output end of the SOFC stack and the burner, and the second heat exchanger is used to heat the air introduced into the air input end.

[0013] Furthermore, the burner of the Stirling engine is connected to the first heat exchanger for passing the exhaust gas generated in the burner into the first heat exchanger; the first heat exchanger is connected to the reformer for passing the exhaust gas into the reformer; the first heat exchanger is used to absorb the heat of the exhaust gas and heat the air passed into the air input end.

[0014] Furthermore, the reformer and the burner are respectively connected to the same fuel pump through passages, and the fuel pump is used to deliver fuel to the reformer alone or to the reformer and the burner simultaneously.

[0015] Furthermore, a first temperature sensor is arranged at the fuel input end, a second temperature sensor is arranged at the air input end, and a third temperature sensor is arranged at the exhaust gas output end.

[0016] Furthermore, the exhaust gas output end includes an anode output end and a cathode output end, the cathode output end is connected to a second heat exchanger, and the second heat exchanger is connected to a burner; the second heat exchanger is used to absorb the heat of the exhaust gas output from the cathode output end and heat the air passed into the air input end.

[0017] Furthermore, a third heat exchanger is provided between the anode output end and the burner, for absorbing the heat of the tail gas at the anode output end and preheating the fuel input to the burner and / or the reformer.

[0018] Furthermore, the fuel input end is provided with a first temperature sensor, the air input end is provided with a second temperature sensor, the anode output end is provided with a third temperature sensor, and the cathode output end is provided with a fourth temperature sensor.

[0019] Furthermore, the Stirling engine also includes a piston, and the temperature difference between the burner and the heat dissipation end drives the piston to do work.

[0020] 3. Beneficial effects

[0021] Compared with the existing known technologies, the technical solution provided by the utility model has the following beneficial effects:

[0022] (1) The utility model is a SOFC system combined with a Stirling engine, which directly introduces the exhaust gas generated by the SOFC stack into the combustion chamber of the Stirling engine, heats the hot end of the Stirling engine through combustion in the combustion chamber, and cools the cold end of the Stirling engine through air. At the same time, the air is preheated and introduced into the SOFC stack after preheating. This not only enables the Stirling engine to generate useful work by utilizing the temperature difference, but also heats the air required by the SOFC stack and fully utilizes the exhaust gas generated by the SOFC stack, thereby improving energy utilization efficiency.

[0023] (2) The utility model is a SOFC system combined with a Stirling engine, which divides air into two paths for entering the SOFC stack. One path enters the SOFC stack after being preheated at the cold end of the Stirling engine, and the other path directly enters the SOFC stack. By controlling the flow rates of the two air paths through a control valve, the temperature of the air entering the SOFC stack can be controlled, thereby controlling the working efficiency of the SOFC stack. At the same time, by controlling the amount of air entering the cold end of the Stirling engine, the power generation efficiency of the Stirling engine can be controlled, thereby enabling the staff to accurately adjust the power generation efficiency of the system.

[0024] (3) The utility model is a SOFC system combined with a Stirling engine, which is equipped with multiple temperature sensors to monitor the temperature at various locations in the system. The fuel and air flow rates are adjusted in real time based on the monitoring data, thereby accurately controlling the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the system of Example 1 disclosed in the present invention;

[0026] Figure 2 It is a structural schematic diagram of the system of Example 2 disclosed in the present invention;

[0027] Figure 3 It is a structural schematic diagram of the system of Example 3 disclosed in the present invention;

[0028] Figure 4 It is a structural schematic diagram of the system of Example 4 disclosed in the present invention;

[0029] Figure 5 It is a schematic diagram of the structure of a Stirling engine;

[0030] Figure 6 Schematic diagram of the SOFC stack structure.

[0031] Explanation of the symbols in the schematic diagram:

[0032] 1. First fuel pump; 2. Reformer; 3. SOFC stack; 31. Fuel input terminal; 32. Air input terminal; 33. Anode output terminal; 34. Cathode output terminal; 4. First heat exchanger; 5. Second heat exchanger; 6. Stirling engine; 61. Burner; 62. Piston; 63. Heat dissipation terminal; 64. Power output terminal; 7. Second fuel pump; 8. Air pump; 9. Controller; 10. Control valve; 11. Third heat exchanger;

[0033] 100, pipeline passage; 200, control passage; 300, power output passage;

[0034] T1, first temperature sensor; T2, second temperature sensor; T3, third temperature sensor; T4, fourth temperature sensor. DETAILED DESCRIPTION

[0035] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the drawings and embodiments.

[0036] Example 1

[0037] Combination Figure 1The SOFC system combined with the Stirling engine of the present embodiment includes a SOFC stack 3 and a Stirling engine 6, wherein the Stirling engine 6 includes a burner 61, a piston 62, a heat sink 63 and a power output end 64 (see Figure 5 ); In this embodiment, the burner 61 recovers the thermal energy and chemical energy of the exhaust gas of the SOFC stack 3 through combustion, and the heat dissipation end 63 is cooled by air. The temperature difference between the hot end and the cold end causes the working gas in the Stirling engine 6 to compress and expand. The gas compression and expansion can drive one or more pistons 62 that drive the rotating shaft to do work, thereby generating additional electricity outside the SOFC stack 3. The electricity is coupled to the generator head output by the power output end 64.

[0038] Furthermore, the SOFC stack 3 includes a fuel input terminal 31, an air input terminal 32 and an exhaust gas output terminal (an anode output terminal 33 and a cathode output terminal 34), wherein the fuel input terminal 31 is connected to the reformer 2, the air input terminal 32 is connected to the air pump 8, and the exhaust gas output terminal is connected to the burner 61 of the Stirling engine 6. The air pump 8 is connected to the air input terminal 32 in two ways, one way is connected to the air input terminal 32 after passing through the heat dissipation terminal 63 of the Stirling engine 6, and the other way is directly connected to the air input terminal 32; the exhaust gas generated by the Stirling engine 6 is connected to the reformer 2 to provide heat for the reformer 2. In this embodiment, a control valve 10 is set at the outlet of the air pump 8 to control the air flow rate in the two paths connected to the air input terminal 32.

[0039] In this embodiment, two heat exchangers are provided, namely, the first heat exchanger 4 and the second heat exchanger 5, wherein the first heat exchanger 4 is provided between the reformer 2 and the burner 61, and the second heat exchanger 5 is provided between the tail gas output end and the burner 61. The tail gas at the tail gas output end enters the second heat exchanger 5 to exchange heat with the air. After the heat exchange, the tail gas at the tail gas output end enters the burner 61 for combustion. The exhaust gas generated after the burner 61 is burned enters the first heat exchanger 4 to exchange heat with the air from the second heat exchanger 5. After the heat exchange, the combustion tail gas generated by the burner 61 enters the reformer 2 to heat the reformer 2, and the air enters the SOFC stack 3 through the air input end 32.

[0040] The air is divided into two paths controlled by the control valve 10. After one of the paths is heated by the heat dissipation end 63, the two air paths merge. The merged air enters the second heat exchanger 5 (for heat exchange with the exhaust gas generated by the SOFC stack 3) and the first heat exchanger 4 (for heat exchange with the exhaust gas generated after combustion in the burner 61) in turn for preheating, and then enters the SOFC stack 3 through the air input end 32.

[0041] In this embodiment, the reformer 2 is connected to the first fuel pump 1 for reforming the fuel from the first fuel pump 1 .

[0042] Furthermore, the SOFC system is further provided with a second fuel pump 7, which is connected to the burner 61 and is used to provide fuel to the burner 61 of the Stirling engine.

[0043] In this embodiment, a first temperature sensor T1, a second temperature sensor T2 and a third temperature sensor T3 are respectively arranged at the fuel input end 31, the air input end 32 and the exhaust gas output end of the SOFC stack 3. The three temperature sensors are electrically connected to the controller 9 through the control passage 200 to report the temperature to the controller 9. The controller 9 is also electrically connected to the second fuel pump 7, the air pump 8 and the control valve 10. The controller 9 is used to control the opening of the second fuel pump 7, the air pump 8 and the control valve 10 according to the temperature feedback from the first temperature sensor T1, the second temperature sensor T2 and the third temperature sensor T3, thereby adjusting the flow of fuel and air entering the system, as well as the flow of air entering the heat dissipation end 63 of the Stirling engine 6.

[0044] In the system of this embodiment, the SOFC stack 3 is connected to the burner 61 of the Stirling engine 6 through a pipeline passage through a heat exchanger, and the tail gas generated by the SOFC stack 3 is passed into the burner 61 for combustion; the reformer 2 is connected to the SOFC stack 3 through a pipeline passage, and the heated and reformed reformed gas is delivered to the SOFC stack 3; the Stirling engine 6 is connected to the reformer 2 through a pipeline passage through a heat exchanger to heat the fuel; the air pump 8 connects the SOFC stack 3 and the Stirling engine 6 through a pipeline passage, uses air to cool the cold end of the Stirling engine 6 and delivers the heated air into the SOFC stack 3 for power generation. In the system of this embodiment, the fuel and air are also respectively passed into the SOFC stack 3 and the Stirling engine 6 through the pipeline passage. Multiple temperature sensors, air pump 8, a fuel pump for inputting fuel, and a control valve 10 are electrically connected to the controller 9 through a control passage 200; the SOFC stack 3 and the Stirling engine 6 output electrical energy to the outside through a power output passage 300.

[0045] In this embodiment, in the startup phase, the fuel first enters the burner 61 in the Stirling engine 6 through the second fuel pump 7 for combustion, at which time the Stirling engine 6 starts to generate power, and the exhaust gas generated by the burner 61 enters the reformer 2 to heat the reformer 2; in the working phase, when the reformer 2 reaches the set temperature, the fuel enters the reformer 2 through the first fuel pump 1, the reformer 2 reforms the fuel, and the reformed gas obtained by the reforming is input into the SOFC stack 3, the air pump 8 and the control valve 10 are started at the same time, and the air is passed into the SOFC stack 3, and at this time the SOFC stack 3 starts to work. The exhaust gas generated by the SOFC stack 3 and the fuel from the second fuel pump 7 are simultaneously passed into the burner 61 for combustion. The air is divided into two paths through the control valve 10. One path is preheated through the heat dissipation end 63 and provides a cold source for the Stirling engine 6 at the same time, so that a temperature difference is formed between the burner 61 end and the heat dissipation end 63, so that the internal gas is compressed and expanded, so that the Stirling engine 6 generates electricity; the other path is not heated; after the air is preheated through the heat dissipation end 63, it merges with the unpreheated air through the pipeline passage 100 and enters the second heat exchanger 5 and the first heat exchanger 4 in turn for preheating, and then passes into the SOFC stack 3.

[0046] This embodiment can adjust the total air flow and the air bypass flow without preheating respectively by controlling the air pump 8 and the control valve 10. The air pump 8 controls the total air flow, and the control valve 10 controls the air bypass flow. When it is detected that the temperature of the tail gas output end of the SOFC stack 3 is high, the air pump 8 is controlled to increase the total air flow, and the control valve 10 is adjusted to keep the air flow at the cold end (i.e., the heat dissipation end 63) of the Stirling engine 6 unchanged, and increase the air bypass flow. At this time, the temperature of the air input end 32 of the SOFC stack 3 is reduced. The control valve 10 can also be adjusted to control the air flow at the cold end (i.e., the heat dissipation end 63) of the Stirling engine 6 to increase, and the air bypass flow remains unchanged, so that the cooling rate of the Stirling engine 6 is increased, and the power generation is increased. At this time, the hot end of the Stirling engine 6 needs to absorb more heat, so that the temperature of the exhaust gas discharged by the burner 61 is reduced, and the temperature of the fuel input end 31 after reforming heat exchange is reduced, thereby reducing the power of the SOFC stack 3. When it is detected that the temperature of the exhaust gas output end is low, the air flow rate of the heat dissipation end 63 is reduced, and the temperature of the air input end 32 can be increased. At this time, the cooling rate of the Stirling engine 6 is reduced, the power generation capacity is reduced, and the hot end of the Stirling engine 6 needs to absorb less heat, thereby increasing the temperature of the exhaust gas discharged by the burner 61. Then, the temperature of the fuel input end 31 after reforming heat exchange increases, thereby increasing the power of the SOFC stack 3.

[0047] The fuel source of this embodiment includes but is not limited to natural gas, methane, ethane, propane, etc.

[0048] In this embodiment, the SOFC stack is composed of a plurality of SOFC cells connected in series or in parallel. The present application does not specifically limit the type of the SOFC single cell. The SOFC cell may be a tubular SOFC cell or a flat SOFC cell.

[0049] Example 2

[0050] Combination Figure 2 and Figure 6 In the present embodiment, a SOFC system combined with a Stirling engine is optimized for the system of Embodiment 1, and the exhaust gas output end is divided into an anode output end 33 and a cathode output end 34. The exhaust gas at the cathode output end 34 enters the burner 61 after heat exchange with the air through the second heat exchanger 5; the exhaust gas at the anode output end 33 is first connected to the third heat exchanger 11 for heat exchange with the fuel from the second fuel pump 7, and then enters the burner 61.

[0051] In this embodiment, the third heat exchanger 11 preheats the fuel input to the burner 61 or the reformer 2 .

[0052] In this embodiment, the fuel input end 31 is provided with a first temperature sensor T1, the air input end 32 is provided with a second temperature sensor T2, the anode output end 33 is provided with a third temperature sensor T3, and the cathode output end 34 is provided with a fourth temperature sensor T4. The four temperature sensors are electrically connected to the controller 9 through the control passage 200 to report the temperature to the controller 9. The controller 9 is also electrically connected to the second fuel pump 7, the air pump 8 and the control valve 10. The controller 9 controls the opening of the second fuel pump 7, the air pump 8 and the control valve 10 according to the temperature feedback of the four temperature sensors, thereby adjusting the flow of fuel and air entering the system, as well as the flow of air entering the heat dissipation end 63 of the Stirling engine 6 and the flow of the air bypass.

[0053] In this embodiment, when the temperature of the anode output end 33 is detected to be reduced, the second fuel pump 7 is controlled to increase the amount of fuel in the burner 61 of the Stirling engine, so that the combustion is more complete and the exhaust gas temperature is higher, thereby increasing the fuel input temperature of the SOFC stack 3. At this time, the efficiency of the Stirling engine 6 is increased, the heat dissipation power of the heat dissipation end 63 is increased, the outflow temperature of the air at the cold end is increased, and the power generation efficiency of the Stirling engine 6 is improved. In order to maintain the temperature of the air input end 32, the control valve 10 is adjusted to increase the bypass air volume. Otherwise, the opposite control is performed.

[0054] Example 3

[0055] Combination Figure 3This embodiment is further optimized on the basis of Embodiment 1 or Embodiment 2, the first fuel pump 1 is deleted, and only the second fuel pump 7 is retained; in this embodiment, the second fuel pump 7 is first connected to the third heat exchanger 11, and then connected to the reformer 2 from the third heat exchanger 11, and the fuel is input into the reformer 2 for reforming after heat exchange through the third heat exchanger 11. The tail gas at the anode output end 33 is first connected to the third heat exchanger 11 for heat exchange with the fuel from the second fuel pump 7, and then enters the burner 61, so as to preheat the fuel delivered by the second fuel pump 7.

[0056] When the system is working, the second fuel pump 7 directly sends the fuel to the reformer 2 for fuel reforming after heat exchange through the third heat exchanger 11. At this time, the Stirling engine 6 is not started, and the SOFC stack 3 is started. The tail gas generated when the SOFC stack 3 is working exchanges heat with the fuel in the third heat exchanger 11, so that the fuel enters the reformer 2 and reaches a certain temperature, thereby improving the efficiency of the SOFC stack 3. The tail gas after heat exchange enters the burner 61 for combustion. At this time, the Stirling engine 6 starts to generate power, and the exhaust gas generated by the burner 61 enters the reformer 2 to heat the reformer 2.

[0057] In the working stage of the system of this embodiment, the fuel enters the reformer 2 through the second fuel pump 7, the reformer 2 reforms the fuel, and the reformed gas obtained by the reforming is input into the SOFC stack 3. The air pump 8 and the control valve 10 are started at the same time to pass the air into the SOFC stack 3, and the SOFC stack 3 starts to work. The tail gas generated by the SOFC stack 3 is passed into the burner 61 for combustion. The air is divided into two paths through the control valve 10. One path is preheated through the heat dissipation end 63, and at the same time, a cold source is provided for the Stirling engine 6, so that a temperature difference is formed between the burner 61 end and the heat dissipation end 63, so that the internal gas is compressed and expanded, so that the Stirling engine 6 generates electricity; the other path is not heated; after the air is preheated at the heat dissipation end 63, it merges with the unpreheated air through the pipeline passage 100, and then enters the second heat exchanger 5 and the first heat exchanger 4 in sequence for preheating, and then passes into the SOFC stack 3.

[0058] Example 4

[0059] Combination Figure 4This embodiment is further optimized on the basis of embodiment 3. After the second fuel pump 7 is connected to the third heat exchanger 11, it is divided into two paths, one path is connected to the reformer 2, and the other path is connected to the burner 61. The second fuel pump 7 is connected to the reformer 2 and the burner 61 at the same time. The third heat exchanger 11 preheats the fuel input to the burner 61 and the reformer 2 at the same time. One path of fuel gas enters the reformer 2 after heat exchange, and the other path of fuel gas enters the burner 61 after merging with the anode tail gas, thereby improving the reforming and combustion rates. At this time, the working process of this embodiment is similar to that of embodiment 2. In the startup stage, the second fuel pump 7 first passes the fuel into the burner 61; in the working stage, the second fuel pump 7 passes the fuel into the reformer 2 and the burner 61 at the same time.

[0060] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A SOFC system combined with a Stirling engine, characterized in that: The SOFC stack (3) comprises a fuel input end (31), an air input end (32) and an exhaust gas output end, wherein the fuel input end (31) is connected to a reformer (2), the air input end (32) is connected to an air pump (8), and the exhaust gas output end is connected to a burner (61) of a Stirling engine (6); the air pump (8) is connected to the air input end (32) in two ways, one way is connected to the air input end (32) after passing through a heat dissipation end (63) of the Stirling engine (6), and the other way is connected to the air input end (32); the exhaust gas generated by the Stirling engine (6) is connected to the reformer (2).

2. A SOFC system combined with a Stirling engine according to claim 1, characterized in that: The outlet of the air pump (8) is provided with a control valve (10) to control the air flow in the two passages connected to the air input end (32).

3. The SOFC system combined with a Stirling engine according to claim 1, characterized in that: A second heat exchanger (5) is provided between the tail gas output end of the SOFC stack (3) and the burner (61).

4. The SOFC system combined with a Stirling engine according to claim 3, characterized in that: The burner (61) of the Stirling engine (6) is connected to the first heat exchanger (4); the first heat exchanger (4) is connected to the reformer (2).

5. The SOFC system combined with a Stirling engine according to claim 4, characterized in that: The reformer (2) and the burner (61) are respectively connected to the same fuel pump through passages, and the fuel pump is used to deliver fuel to the reformer (2) alone or to deliver fuel to the reformer (2) and the burner (61) simultaneously.

6. The SOFC system combined with a Stirling engine according to claim 4, characterized in that: The fuel input end (31) is provided with a first temperature sensor (T1), the air input end (32) is provided with a second temperature sensor (T2), and the exhaust gas output end is provided with a third temperature sensor (T3).

7. The SOFC system combined with a Stirling engine according to claim 3, characterized in that: The tail gas output end comprises an anode output end (33) and a cathode output end (34), and a second heat exchanger (5) is arranged between the cathode output end (34) and the burner (61), and the second heat exchanger (5) is used to absorb the heat of the tail gas outputted from the cathode output end (34).

8. The SOFC system combined with a Stirling engine according to claim 7, characterized in that: A third heat exchanger (11) is provided between the anode output end (33) and the burner (61).

9. The SOFC system combined with a Stirling engine according to claim 7, characterized in that: The fuel input end (31) is provided with a first temperature sensor (T1), the air input end (32) is provided with a second temperature sensor (T2), the anode output end (33) is provided with a third temperature sensor (T3), and the cathode output end (34) is provided with a fourth temperature sensor (T4).

10. The SOFC system combined with a Stirling engine according to claim 1, characterized in that: The Stirling engine (6) further comprises a piston (62), and the burner (61) and the heat dissipation end (63) generate a temperature difference to drive the piston (62) to perform work.

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