JP2016134278A - Fuel battery system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel battery system that can enhance the system efficiency.SOLUTION: A fuel battery system 1 has a reformer 2 for introducing air to reform ammonia, a fuel battery 3 for generating power by using fuel gas and air, an ammonia tank 5 for storing ammonia under liquid state, a pump 6 for feeding out the ammonia under liquid state to the reformer 2, a vaporizer 7 which is disposed between the pump 6 and the reformer 2, and vaporizes the ammonia under liquid state, an air feeder 8 for feeding air to the reformer 2 and the fuel battery 3, a heat-exchanger 9 which is disposed between the air feeder 8 and the fuel battery 3, and heat-exchanges air to pre-heat the air, a first exhaust gas supplier 16 for supplying exhaust gas exhausted from the fuel battery 3 to the vaporizer 7, and a second exhaust gas supplier 17 for supplying exhaust gas to the heat exchanger 9. The vaporizer 7 vaporizes the ammonia under liquid state by waste heat of the exhaust gas, and the heat exchanger 9 heat-exchanges the air by the waste heat of the exhaust gas to pre-heat the air.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fuel cell system.

  As a conventional fuel cell system, for example, a technique described in Patent Document 1 is known. The fuel cell system described in Patent Document 1 includes a solid polymer fuel cell that generates power using a hydrogen-containing gas as a fuel gas, a reformer that generates ammonia by reforming ammonia, and a liquid state fuel cell system. A storage tank for storing ammonia, a pump provided between the storage tank and the reformer, for supplying liquid ammonia to the reformer, a pump for supplying air to the reformer, and air for the fuel cell And a pump for supplying

JP 2011-146174 A

  In the above prior art, liquid ammonia is vaporized by a heat exchanger provided in the reformer. Specifically, power is supplied to the heater by the secondary battery, and heat exchange is performed between the liquid ammonia and the heat of the heater by the heat exchanger, thereby heating and vaporizing the liquid ammonia. Thus, since the heater and the secondary battery are used to vaporize ammonia, the system efficiency is poor.

  An object of the present invention is to provide a fuel cell system capable of improving system efficiency.

  A fuel cell system according to an aspect of the present invention includes a reformer that generates fuel gas by introducing air to reform ammonia, and power generation using the fuel gas and air generated by the reformer. A fuel cell, an ammonia tank for storing ammonia in a liquid state, a pump for sending liquid ammonia stored in the ammonia tank toward the reformer, and the pump and the reformer, A vaporizer for vaporizing ammonia in a liquid state, an insufflator that sends air to the reformer and the fuel cell, and a heat exchanger that is arranged between the insufflator and the fuel cell to exchange heat and preheat the air And a first exhaust gas supply unit that supplies exhaust gas discharged from the fuel cell to the vaporizer, and a second exhaust gas supply unit that supplies exhaust gas to the heat exchanger, and the vaporizer is in a liquid state by exhaust heat of the exhaust gas. Vaporized ammonia The heat exchanger is characterized by preheating the air by heat exchange with the exhaust gas waste heat.

  As described above, in the fuel cell system of the present invention, the exhaust gas discharged from the fuel cell is supplied to the vaporizer by the first exhaust gas supply unit, and the liquid ammonia is vaporized by the exhaust heat of the exhaust gas in the vaporizer. Further, the exhaust gas discharged from the fuel cell is supplied to the heat exchanger by the second exhaust gas supply unit, and in the heat exchanger, air is heat-exchanged by the exhaust heat of the exhaust gas and preheated. Thus, the exhaust heat of exhaust gas is effectively used for the vaporization of ammonia and the heat exchange of air. Thereby, the system efficiency of a fuel cell system can be improved.

  The control unit further controls the air-fuel ratio of the reformer, and the control unit controls the air-fuel ratio of the reformer during start-up operation to be higher than the air-fuel ratio of the reformer during normal operation. Good. With such a configuration, the amount of air introduced into the reformer increases during start-up operation compared to during normal operation. Accordingly, since the decomposition temperature of ammonia in the reformer increases, the temperature of the fuel gas generated in the reformer and introduced into the fuel cell increases. Thereby, a fuel cell can be warmed up early at the time of start-up operation.

  The control unit may perform control so that the air-fuel ratio of the reformer during start-up operation is 1.0 or more. In this case, the decomposition temperature of ammonia in the reformer becomes sufficiently high. As a result, it is possible to reliably warm the fuel cell early during start-up operation.

  A valve that adjusts the flow rate of the air supplied from the insufflator to the reformer is disposed between the insufflator and the reformer, and the control unit controls the opening degree of the valve. The air-fuel ratio of the reformer may be controlled. By using the valve for adjusting the air flow rate in this way, the air-fuel ratio of the reformer can be easily controlled.

  The apparatus further includes a combustor that combusts the exhaust gas discharged from the fuel cell, the first exhaust gas supply unit supplies the exhaust gas burned by the combustor to the vaporizer, and the second exhaust gas supply unit is combusted by the combustor. Exhaust gas may be supplied to the heat exchanger. When the exhaust gas discharged from the fuel cell is burned by the combustor, the temperature of the exhaust gas increases. Therefore, it is possible to effectively perform ammonia vaporization and air heat exchange using exhaust heat of exhaust gas.

  ADVANTAGE OF THE INVENTION According to this invention, the fuel cell system which can improve system efficiency is provided.

It is a system configuration figure showing a fuel cell system concerning one embodiment. It is a flowchart which shows the procedure of the control processing performed by a control apparatus at the time of starting operation of a fuel cell system.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a system configuration diagram showing a fuel cell system according to an embodiment. In FIG. 1, a fuel cell system 1 of the present embodiment includes an ATR (Auto Thermal Reforming) type reformer 2 and a solid oxide fuel cell (SOFC) 3.

The reformer 2 introduces air to reform ammonia (NH ₃ ), thereby generating a fuel gas containing hydrogen. The reformer 2 includes an NH ₃ oxidation unit 2a and an NH ₃ decomposition unit 2b arranged on the downstream side of the NH ₃ oxidation unit 2a. The NH ₃ oxidation unit 2a generates heat by oxidizing ammonia. The NH ₃ decomposition unit 2b generates hydrogen by decomposing ammonia by heat generated in the NH ₃ oxidation unit 2a.

Here, when the reformer 2 has the NH ₃ oxidation unit 2a and NH ₃ decomposing unit 2b, the use of active catalyst in both the reaction of oxidation and decomposition of NH ₃ is NH ₃ An integrated reformer 2 having both functions of oxidizing and decomposing NH ₃ may be used without separating the oxidizing unit and the NH ₃ decomposing unit. In this case, since the oxidation reaction generally takes place earlier than the decomposition reaction, the same reaction as described above occurs.

  The fuel cell 3 is connected to the reformer 2 via a fuel gas supply pipe 4. The fuel cell 3 generates power using the fuel gas and air generated by the reformer 2. The fuel cell 3 has a stack structure in which a plurality of single cells are stacked. The single cell includes an anode (fuel electrode) 3a, a cathode (air electrode) 3b, and an electrolyte (not shown) disposed between the anode 3a and the cathode 3b. The fuel gas supply pipe 4 is connected to the anode 3a. Fuel gas is introduced into the anode 3a. Air is introduced into the cathode 3b. The electrolyte is made of a ceramic such as stabilized zirconia.

The fuel cell system 1 includes a liquid NH ₃ tank 5, a pump 6, a vaporizer 7, an air blower 8, a heat exchanger 9, and a combustor 10.

The liquid NH ₃ tank 5 is an ammonia tank that stores ammonia in a liquid state. The liquid NH ₃ tank 5 stores ammonia at, for example, room temperature (20 ° C. to 25 ° C.) and several atmospheres (8 atmospheres to 10 atmospheres). Since the liquid NH ₃ tank 5 stores ammonia in a liquid state instead of a gas, the ammonia storage efficiency is good, and the operating time of the fuel cell system 1 can be extended. In addition, ammonia can be easily supplied to the liquid NH ₃ tank 5.

The pump 6 is connected to the reformer 2 via an ammonia supply pipe 11. The pump 6 sends out liquid ammonia (hereinafter, liquid ammonia) stored in the liquid NH ₃ tank 5 toward the reformer 2.

  The vaporizer 7 is disposed in the ammonia supply pipe 11. That is, the vaporizer 7 is disposed between the pump 6 and the reformer 2. The vaporizer 7 vaporizes liquid ammonia.

  The air blower 8 is connected to the reformer 2 and the fuel cell 3 via air supply pipes 12 and 13. One end of the air supply pipe 13 is branched and connected to the air supply pipe 12, and the other end of the air supply pipe 13 is connected to the cathode 3 b of the fuel cell 3. The air blower 8 is an air supply device that blows out air and sends it to the reformer 2 and the fuel cell 3.

  A valve 14 is disposed in the air supply pipe 12. That is, the valve 14 is disposed between the air blower 8 and the reformer 2. The valve 14 is an electromagnetic flow rate adjusting valve that adjusts the flow rate of air supplied from the air blower 8 to the reformer 2.

  The heat exchanger 9 is disposed in the air supply pipe 13. That is, the heat exchanger 9 is disposed between the air blower 8 and the fuel cell 3. The heat exchanger 9 preheats the air sent to the fuel cell 3 by exchanging heat.

  The combustor 10 is connected to the anode 3 a and the cathode 3 b of the fuel cell 3 through the exhaust pipe 15. In the exhaust pipe 15, a mixed gas of unreacted fuel gas discharged from the anode 3a and unreacted air discharged from the cathode 3b flows as exhaust gas (off gas). The combustor 10 burns exhaust gas. Specifically, the combustor 10 burns unburned fuel gas remaining in the exhaust gas. When exhaust gas is burned by the combustor 10, the temperature of the exhaust gas rises.

  In addition, the fuel cell system 1 includes an exhaust gas supply pipe 16 that constitutes a first exhaust gas supply unit that supplies exhaust gas burned by the combustor 10 to the carburetor 7, and the exhaust gas burned by the combustor 10 as a heat exchanger 9. And an exhaust gas supply pipe 17 constituting a second exhaust gas supply unit for supplying to the exhaust gas.

  The vaporizer 7 vaporizes liquid ammonia by exhaust heat of exhaust gas flowing through the exhaust gas supply pipe 16. The exhaust gas flowing through the exhaust gas supply pipe 16 is released to the atmosphere. The heat exchanger 9 preheats the heat by exchanging air with the exhaust heat of the exhaust gas flowing through the exhaust gas supply pipe 17. The exhaust gas flowing through the exhaust gas supply pipe 17 is released to the atmosphere.

  Furthermore, the fuel cell system 1 detects the temperature of the fuel cell 3 and the electric heater 18 for starting to heat the reformer 2 during the starting operation, the electric heater 19 for starting to heat the fuel cell 3 during the starting operation. The temperature sensor 20 which performs and the control apparatus 21 (control part) are provided. The temperature sensor 20 detects, for example, the temperature near the outlet where unreacted fuel gas in the fuel cell 3 is discharged.

  The control device 21 controls the entire system during operation of the fuel cell system 1. Specifically, the control device 21 controls the pump 6, the air blower 8, the valve 14, and the electric heaters 18 and 19 based on the detection value of the temperature sensor 20.

During normal operation of the fuel cell system 1 as described above, when liquid ammonia stored in the liquid NH ₃ tank 5 is discharged from the pump 6, the liquid ammonia is sent to the vaporizer 7 through the ammonia supply pipe 11. It is done. In the vaporizer 7, the liquid ammonia is heated and vaporized by the exhaust heat of the exhaust gas flowing through the exhaust gas supply pipe 16. The vaporized ammonia is supplied to the reformer 2 through the ammonia supply pipe 11. On the other hand, air is supplied to the reformer 2 through the air supply pipe 12 by the air blower 8.

When ammonia and air are introduced into the reformer 2, in the NH ₃ oxidation section 2a of the reformer 2, a part of ammonia and oxygen in the air chemically react as shown in the following formula, and the oxidation of the ammonia Heat is generated by the reaction (exothermic reaction).
NH ₃ + 3 / 4O ₂ → 1 / 2N ₂ + 3 / 2H ₂ O

Then, in the NH ₃ decomposition section 2b of the reformer 2, the remaining ammonia is decomposed by the heat generated in the NH ₃ oxidation section 2a as shown in the following formula (endothermic reaction), and the fuel gas is rich in hydrogen. Is generated. The fuel gas is supplied to the anode 3 a of the fuel cell 3 through the fuel gas supply pipe 4. The temperature of the fuel gas at this time is about 600 ° C., for example.
NH ₃ → 3 / 2H ₂ + 1 / 2N ₂

  Also, air at room temperature is sent to the heat exchanger 9 through the air supply pipes 12 and 13 by the air blower 8. In the heat exchanger 9, air at normal temperature is heat-exchanged by the exhaust heat of the exhaust gas flowing through the exhaust gas supply pipe 17 and preheated. The preheated air is supplied to the cathode 3 b of the fuel cell 3 through the air supply pipe 13. Note that the temperature of the air at this time is approximately the same as the temperature of the fuel gas, for example.

  When the fuel gas and air are introduced into the fuel cell 3, in the fuel cell 3, hydrogen in the fuel gas and oxygen in the air chemically react to generate water, and DC power is generated. The DC power generated in the fuel cell 3 is converted into AC power by the inverter 22. Then, AC power is supplied to the power load 23.

  Further, exhaust gas (off-gas) is discharged from the fuel cell 3. The temperature of the exhaust gas at this time is, for example, about 700 ° C to 800 ° C. The exhaust gas is supplied to the combustor 10 through the exhaust pipe 15 and burned by the combustor 10. The temperature of the exhaust gas after combustion is, for example, about 1000 ° C. to 1100 ° C.

  The exhaust gas combusted in the combustor 10 is supplied to the vaporizer 7 through the exhaust gas supply pipe 16. The exhaust heat of the exhaust gas is used for vaporizing liquid ammonia by the vaporizer 7. Further, the exhaust gas combusted by the combustor 10 is supplied to the heat exchanger 9 through the exhaust gas supply pipe 17. The exhaust heat of the exhaust gas is used for heat exchange of air by the heat exchanger 9.

  FIG. 2 is a flowchart showing a procedure of control processing executed by the control device 21 during start-up operation of the fuel cell system 1. When a power switch (not shown) of the fuel cell system 1 is turned on, execution of this process is started.

  In the initial state when the execution of this process is started, the opening degree of the valve 14 is an opening degree that ensures the air-fuel ratio (A / F) of the reformer 2 during normal operation. . The air-fuel ratio of the reformer 2 is a ratio between the amount of air present in the reformer 2 and the amount of fuel gas. The air-fuel ratio of the reformer 2 during normal operation is, for example, 0.75 (75% of air with respect to 100% of fuel gas).

  Here, the normal operation is an operation performed when the temperature of the fuel cell 3 reaches an operating temperature (for example, about 700 ° C.). The start-up operation is an operation that is performed before the temperature of the fuel cell 3 reaches the operating temperature.

  In FIG. 2, the control device 21 first controls the starting electric heaters 18 and 19 to be turned on (step S101). Then, the temperature of the reformer 2 rises and the temperature of the fuel cell 3 rises.

  Subsequently, the control device 21 controls the pump 6 so that a small amount of liquid ammonia is sent out toward the reformer 2 by the pump 6 (step S102). When a small amount of liquid ammonia is discharged from the pump 6, the supply pressure of the liquid ammonia decreases to, for example, normal pressure (atmospheric pressure). For this reason, even if liquid ammonia is in a normal temperature state, liquid ammonia is vaporized by the vaporizer 7. The vaporized ammonia is supplied to the reformer 2.

  Subsequently, the control device 21 controls the air blower 8 so that air is blown out by the air blower 8 (step S103). Then, air is supplied to the reformer 2 and the fuel cell 3.

  Subsequently, the control device 21 controls the air-fuel ratio of the reformer 2 to be higher than that during normal operation by controlling the opening of the valve 14 to be larger than that during normal operation (step S104). ). Specifically, the control device 21 performs control so that the air-fuel ratio of the reformer 2 is 1.0 or more (A / F ≧ 1.0), for example. By increasing the air-fuel ratio of the reformer 2 in this way, the amount of air supplied to the reformer 2 becomes larger than during normal operation.

  When ammonia and air are supplied to the reformer 2, fuel gas is generated by the reformer 2. Thereafter, when fuel gas and air are supplied to the fuel cell 3, power generation is performed by the fuel cell 3. Then, the exhaust gas discharged from the fuel cell 3 is combusted by the combustor 10, and the exhaust gas after combustion is supplied to the vaporizer 7 and the heat exchanger 9. Thereby, the normal temperature air sent by the air blower 8 is preheated by the exhaust heat of the exhaust gas in the heat exchanger 9.

  Subsequently, the control device 21 acquires the detection value of the temperature sensor 20 (step S105). Then, the control device 21 determines whether or not the temperature of the fuel cell 3 has reached the operating temperature (step S106). When the temperature of the fuel cell 3 has not reached the operating temperature, step S105 is repeatedly executed.

  When the temperature of the fuel cell 3 reaches the operating temperature, the control device 21 performs control so as to turn off the electric heaters 18 and 19 for starting (step S107).

  Subsequently, the control device 21 controls the pump 6 so that a certain amount of liquid ammonia is sent out toward the reformer 2 by the pump 6 (step S108). The amount of liquid ammonia sent out at this time is sufficiently larger than that during execution of the above-described procedure S102. A certain amount of liquid ammonia is vaporized by the exhaust heat of the exhaust gas in the vaporizer 7.

  Subsequently, the control device 21 controls the opening degree of the valve 14 to return to the opening degree in the initial state (during normal operation), so that the air-fuel ratio of the reformer 2 is returned to the air-fuel ratio in the initial state. Control (step S109). As described above, the normal operation of the fuel cell system 1 described above is performed.

  As described above, in the present embodiment, the exhaust gas discharged from the fuel cell 3 is supplied to the vaporizer 7 through the exhaust gas supply pipe 16. Then, the liquid ammonia sent out by the pump 6 is vaporized by the exhaust heat of the exhaust gas in the vaporizer 7. The exhaust gas discharged from the fuel cell 3 is supplied to the heat exchanger 9 through the exhaust gas supply pipe 17. And the air sent by the air blower 8 is heat-exchanged by the exhaust heat of exhaust gas in the heat exchanger 9, and is preheated. Thus, exhaust heat of exhaust gas is effectively used for vaporization of liquid ammonia and heat exchange of air. Therefore, an electric heater for vaporizing liquid ammonia, an electric heater for exchanging heat of air, and a power source for supplying electric power to these electric heaters are not required. Thereby, the system efficiency of the fuel cell system 1 can be improved.

  Further, since the heat exchanger 9 preheats the air using the exhaust heat of the exhaust gas, there is a temperature difference between the fuel gas introduced into the anode 3a of the fuel cell 3 and the air introduced into the cathode 3b of the fuel cell 3. Get smaller. Therefore, since the temperature difference between the anode 3a and the cathode 3b becomes small, it becomes difficult for heat stress distribution to occur in the electrolyte (not shown) disposed between the anode 3a and the cathode 3b. As a result, the performance and reliability of the fuel cell 3 can be increased.

  Further, the control device 21 controls the air-fuel ratio of the reformer 2 during the start-up operation to be higher than the air-fuel ratio of the reformer 2 during the normal operation. For this reason, at the start-up operation, the amount of air introduced into the reformer 2 is increased compared to the normal operation. Accordingly, since the decomposition temperature of ammonia in the reformer 2 is increased, the temperature of the fuel gas generated in the reformer 2 and introduced into the fuel cell 3 is increased. Thereby, the fuel cell 3 can be warmed up early at the time of starting operation.

  At this time, the control device 21 performs control so that the air-fuel ratio of the reformer 2 is 1.0 or more, so that the decomposition temperature of ammonia in the reformer 2 becomes sufficiently high. Accordingly, it is possible to reliably warm the fuel cell 3 early during the start-up operation.

  Further, the control device 21 controls the opening degree of the valve 14 that adjusts the flow rate of the air supplied from the air blower 8 to the reformer 2. Thereby, the air-fuel ratio of the reformer 2 can be easily controlled.

  Further, the exhaust gas after being combusted by the combustor 10 is supplied to the vaporizer 7 and the heat exchanger 9. When the exhaust gas discharged from the fuel cell 3 is combusted by the combustor 10, the temperature of the exhaust gas increases. Therefore, the vaporization of liquid ammonia and the heat exchange of air using the exhaust heat of exhaust gas can be performed effectively.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, the control device 21 controls the air-fuel ratio of the reformer 2 by controlling the opening of the valve 14 that adjusts the flow rate of air supplied from the air blower 8 to the reformer 2. However, the form is not particularly limited. For example, the fuel cell system 1 may include two air blowers with different air blowing amounts per unit time. In such a configuration, the control device 21 operates an air blower with a large amount of blown out air during start-up operation, and operates an air blower with a small amount of blown out air during normal operation, so that the control device 21 operates during start-up operation and normal operation. The air-fuel ratio of the reformer 2 is controlled. In this case, the valve 14 becomes unnecessary.

  Moreover, in the said embodiment, although the control apparatus 21 controls the air fuel ratio of the reformer 2 by controlling the flow volume of the air supplied to the reformer 2, it is not restricted to the form in particular. The air / fuel ratio of the reformer 2 may be controlled by controlling the flow rate of ammonia supplied to the reformer 2. In this case, a valve for adjusting the flow rate of ammonia supplied to the reformer 2 is disposed in the ammonia supply pipe 11.

  Moreover, in the said embodiment, although the control apparatus 21 is controlling so that the air fuel ratio of the reformer 2 at the time of starting operation is made higher than the air fuel ratio of the reformer 2 at the time of normal operation, especially the form However, the air-fuel ratio of the reformer 2 during start-up operation may be equal to the air-fuel ratio of the reformer 2 during normal operation when early warm-up of the fuel cell 3 is not required. In this case, the control process executed by the control device 21 can be simplified.

  Furthermore, in the above embodiment, the fuel cell system 1 includes the combustor 10 that combusts the exhaust gas discharged from the fuel cell 3, but the exhaust heat of the exhaust gas immediately after being discharged from the fuel cell 3 is directly used as liquid ammonia. The combustor 10 may be omitted as long as it can be used for vaporization of air and heat exchange of air. In this case, the configuration of the fuel cell system 1 can be simplified.

  Moreover, in the said embodiment, although the control apparatus 21 determines whether it switches from starting operation to normal operation based on the detected value of the temperature sensor 20 which detects the temperature of the fuel cell 3, especially in that form. Is not limited. For example, the power generation amount of the fuel cell 3 increases as the temperature of the fuel cell 3 increases. Therefore, the fuel cell system 1 may include a sensor that detects the amount of power generated by the fuel cell 3 instead of the temperature sensor 20. In such a configuration, the control device 21 determines whether to switch from the startup operation to the normal operation based on the power generation amount of the fuel cell 3.

1 ... fuel cell system, 2 ... reformer, 3 ... fuel cell, 5 ... liquid NH ₃ tank (ammonia tank), 6 ... pump, 7 ... vaporizer, 8 ... air blower (air supply unit), 9 ... heat Exchanger, 10 ... combustor, 16 ... exhaust gas supply pipe (first exhaust gas supply part), 17 ... exhaust gas supply pipe (second exhaust gas supply part), 21 ... control device (control part).

Claims (5)

A reformer that generates fuel gas by introducing air to reform ammonia; and
A fuel cell that generates power using the fuel gas and air generated by the reformer;
An ammonia tank for storing the ammonia in a liquid state;
A pump for feeding the liquid ammonia stored in the ammonia tank toward the reformer;
A vaporizer disposed between the pump and the reformer to vaporize the liquid ammonia;
An insufflator for sending the air to the reformer and the fuel cell;
A heat exchanger disposed between the air supply device and the fuel cell, for exchanging heat of the air and preheating;
A first exhaust gas supply unit configured to supply exhaust gas discharged from the fuel cell to the vaporizer;
A second exhaust gas supply unit for supplying the exhaust gas to the heat exchanger,
The vaporizer vaporizes the liquid ammonia by exhaust heat of the exhaust gas,
The fuel cell system, wherein the heat exchanger preheats the air by exchanging heat with the exhaust heat of the exhaust gas. A control unit for controlling the air-fuel ratio of the reformer;
The fuel cell system according to claim 1, wherein the control unit controls the air-fuel ratio of the reformer during start-up operation to be higher than the air-fuel ratio of the reformer during normal operation.   The fuel cell system according to claim 2, wherein the control unit controls the air-fuel ratio of the reformer during the start-up operation to be 1.0 or more. Between the insufflator and the reformer, a valve for adjusting the flow rate of the air supplied from the insufflator to the reformer is disposed,
4. The fuel cell system according to claim 2, wherein the control unit controls an air-fuel ratio of the reformer by controlling an opening degree of the valve. Further comprising a combustor for combusting the exhaust gas discharged from the fuel cell;
The first exhaust gas supply unit supplies the exhaust gas burned by the combustor to the vaporizer,
The fuel cell system according to any one of claims 1 to 4, wherein the second exhaust gas supply unit supplies the exhaust gas burned by the combustor to the heat exchanger.

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