JP2015011885A - Fuel cell system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress deterioration of a catalyst in a modifier due to a situation in which at the time of partial oxidation modification operation, the catalyst locally increases to high temperature.SOLUTION: At the time of partial oxidation modification operation, the temperature of a catalyst at a gas flow upstream part in a modifier 13 locally exceeds a catalyst deterioration temperature, so that the catalyst deteriorates in an early stage. Accordingly, a fuel inlet part 181 of a combustion chamber 17 is disposed closer to a gas flow downstream side in the combustion chamber 17 than a position at which at the time of partial oxidation modification operation, the fuel inlet part 181 is adjacent to an in-modifier high-temperature region a that is subjected to a high temperature in the modifier 13. With this, part of the catalyst around the in-modifier high-temperature region a is prevented from being heated by a combustion gas in the combustion chamber 17. Also, part of the catalyst around the in-modifier high-temperature region a is cooled before air before it is mixed with fuel.

Description

  The present invention relates to a fuel cell system including a fuel cell that generates electrical energy by an electrochemical reaction between an oxidant gas and a fuel gas.

  Conventionally, a solid oxide fuel cell system including a reformer that reforms a raw material such as city gas to generate a fuel gas containing hydrogen has been proposed.

  In addition, in a fuel cell system that performs steam reforming, the temperature of the catalyst in the reformer is raised to about 600 ° C. in which the steam reforming reaction proceeds. And the oxidant gas off-gas and fuel gas off-gas are combusted and the entire reformer is uniformly heated by the heat (see, for example, Patent Document 1).

Japanese Patent No. 4369585

  Here, the broken line in FIG. 5 shows the temperature distribution characteristics in the reformer during the partial oxidation reforming operation of the conventional fuel cell system. As shown in FIG. 5, in the conventional fuel cell system, although the entire reformer is uniformly heated by the combustion heat of off-gas, the partial oxidation reforming reaction is a complete oxidation reaction of hydrocarbon and steam reforming. The reaction takes place continuously, and the complete oxidation reaction of the hydrocarbon causes the gas flow upstream portion in the reformer (that is, immediately after the reformer inlet) to have the highest temperature in the reformer.

  In the partial oxidation reforming operation, the catalyst temperature in the upstream portion of the gas flow in the reformer locally exceeds the catalyst deterioration temperature, and the catalyst deteriorates early.

  The present invention has been made in view of the above points, and an object of the present invention is to suppress catalyst deterioration due to local high temperature of a catalyst in a reformer during partial oxidation reforming operation.

  To achieve the above object, according to the first aspect of the present invention, a fuel cell (10) that generates electrical energy by an electrochemical reaction between an oxidant gas and a fuel gas, and a reforming target fluid are reformed by a catalyst. And a reformer (13) that generates fuel gas, and a combustor (17) that generates gas for raising the temperature of the reformer by burning air and fuel. And the combustor are disposed in contact with each other so that heat can be transferred, and the air inlet portion (191) in the combustor is disposed adjacent to the inlet portion (141, 161) of the fluid to be reformed in the reformer, The temperature rising gas outlet (241) in the combustor is disposed adjacent to the fuel gas outlet (111) in the reformer, and the fuel inlet (181) in the combustor is partially oxidized and reformed. High temperature part in the reformer that becomes high temperature in the reformer during operation (a) Than the adjacent positions, characterized in that it is arranged in the gas flow downstream of the combustor.

  According to this, the part of the catalyst that becomes high in the reformer during the partial oxidation reforming operation is cooled by the air supplied to the combustor, and the part that becomes high in the reformer during the partial oxidation reforming operation. The catalyst on the further downstream side is heated by a temperature raising gas generated by burning air and fuel in the combustor.

  In other words, the catalyst at the high temperature site in the reformer during the partial oxidation reforming operation is cooled, and the catalyst at the low temperature site in the reformer during the partial oxidation reforming operation is heated. The catalyst temperature distribution in the reformer during the quality operation is smoothed, and the catalyst in the reformer can be prevented from becoming locally hot during the partial oxidation reforming operation, thereby suppressing the deterioration of the catalyst. it can.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

1 is an overall configuration diagram of a fuel cell system according to a first embodiment of the present invention. It is a perspective view of the reformer and combustor of FIG. It is a flowchart of the program at the time of system starting performed in 1st Embodiment. It is a time chart with which it uses for operation | movement description of the fuel cell system which concerns on 1st Embodiment. It is a figure which shows the temperature distribution in the reformer at the time of a partial oxidation reforming operation. It is a figure which shows the temperature distribution in the reformer at the time of a steam reforming driving | operation. It is a block diagram of the reformer and combustor of the fuel cell system which concerns on 2nd Embodiment of this invention. It is a block diagram of the reformer and combustor of the fuel cell system which concerns on 3rd Embodiment of this invention. It is a perspective view of the reformer and combustor of FIG. It is a block diagram of the reformer and combustor of the fuel cell system which concerns on 4th Embodiment of this invention. It is a perspective view of the reformer and combustor of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS.

  This fuel cell system generates electric energy by electrochemically reacting a fuel gas containing hydrogen (and carbon monoxide) generated by steam reforming the fuel and oxygen (oxidant gas) contained in the air. A fuel cell 10 is provided. The fuel cell 10 of the present embodiment is configured by a solid oxide fuel cell (SOFC) whose operating temperature is high.

  The fuel cell 10 is supplied with hydrocarbon-based fuel (including fuel gas containing water vapor) and air as supply fluids. Specifically, an FC fuel supply path 11 for supplying fuel gas is connected to the fuel electrode side of the fuel cell 10, and an FC air supply for supplying air is supplied to the air electrode side of the fuel cell 10. The path 12 is connected.

  In the fuel cell 10, fuel gas containing hydrogen is supplied via the FC fuel supply path 11, and air containing oxygen is supplied via the FC air supply path 12, thereby causing the following electrochemical reaction. Electric energy is generated.

(Fuel electrode) H ₂ + O ²⁻ → H ₂ O + 2e ⁻
(Air electrode) 1 / 2O ₂ + 2e ⁻ → O ²⁻
The fuel cell 10 includes a fuel cell temperature sensor 101 that detects the temperature of the fuel cell 10 and outputs an electric signal corresponding to the temperature to an electronic control device (not shown). The fuel cell temperature sensor 101 is disposed at a portion where the average temperature of the fuel cell 10 is detected. For example, a thermocouple can be used as the fuel cell temperature sensor 101. The electronic control unit includes a known microcomputer including a CPU, RAM, ROM, EEPROM, and the like, and performs arithmetic processing according to a program stored in the microcomputer.

  A reformer 13 is provided on the fuel flow upstream side of the FC fuel supply path 11. The reformer 13 is supplied with a hydrocarbon-based fuel via a reformer fuel supply path 14, supplied with air via a reformer air supply path 15, and passed through a reformer steam supply path 16. The water vapor is supplied through.

  The container of the reformer 13 is a rectangular parallelepiped, and is made of metal (for example, SUS). The reformer fuel supply path 14, the reformer air supply path 15, and the reformer steam supply path 16 are connected to one end surface of the reformer 13. Further, the FC fuel supply path 11 is connected to the other end surface of the reformer 13. An arrow A in FIG. 1 indicates the gas flow in the reformer 13.

  In the reformer 13, a catalyst having both a partial oxidation reforming function and a steam reforming function is accommodated in a reformer vessel, and a mixed gas as a reforming target fluid is reformed by the catalyst to generate hydrogen. And a fuel gas containing carbon monoxide.

  Note that the portion 141 where the reformer fuel supply path 14 is connected to the container of the reformer 13 and the portion 161 where the reformer steam supply path 16 is connected to the container of the reformer 13 are modified according to the present invention. It corresponds to the inlet of the target fluid (mixed gas of water vapor and fuel). The portion 111 where the FC fuel supply path 11 is connected to the container of the reformer 13 corresponds to the fuel gas outlet of the present invention.

  The reformer 13 detects a catalyst temperature or the like in the reformer 13 and outputs an electric signal corresponding to the temperature to the electronic control device. The reformer first temperature sensor 131 and the reformer second temperature sensor 132, a reformer third temperature sensor 133, and a reformer fourth temperature sensor 134 are provided.

  The reformer first temperature sensor 131 is disposed at the inlet of the mixed gas in the reformer 13 and detects the temperature of the mixed gas at that portion (hereinafter referred to as the reformer inlet gas temperature).

  Here, a broken line a in FIG. 1 indicates a high temperature portion in the reformer that is the highest temperature in the reformer 13 during the partial oxidation reforming operation. Incidentally, the high temperature portion a in the reformer is located immediately after the mixed gas inlet portion in the reformer 13.

  The reformer second temperature sensor 132 as temperature detecting means is disposed at a site where the catalyst temperature of the high temperature site a in the reformer (hereinafter referred to as the high temperature catalyst temperature) is detected.

  The reformer third temperature sensor 133 is disposed at a portion where an average catalyst temperature in the reformer 13 (hereinafter referred to as an average catalyst temperature) is detected during the partial oxidation reforming operation.

  Furthermore, the reformer fourth temperature sensor 134 is disposed at the fuel gas outlet of the reformer 13 and detects the catalyst temperature at that portion (hereinafter referred to as outlet catalyst temperature).

  The fuel cell system includes a combustor 17. The combustor 17 is supplied with hydrocarbon-based fuel via a combustor fuel supply path 18 and supplied with air via a combustor air supply path 19. The combustor air supply path 19 is provided with a flow rate adjusting valve 20 that adjusts the flow rate of air supplied to the combustor 17 via the combustor air supply path 19. The combustor 17 includes a spark plug 21, and the supplied air / fuel mixture is ignited by the spark plug 21, and the mixture is combusted to generate a high-temperature combustion gas as a temperature raising gas. .

  Further, unreacted hydrogen (hereinafter referred to as “off gas”) contained in the fuel electrode side exhaust gas of the fuel cell 10 is supplied to the combustor 17 via the first off gas supply path 22, and is supplied to the air electrode side exhaust gas of the fuel cell 10. Unreacted air contained (hereinafter referred to as off-gas) is supplied through the second off-gas supply path 23. And the combustor 17 burns off gas and produces | generates high temperature combustion gas.

  The container of the combustor 17 is a rectangular parallelepiped and is made of metal (for example, SUS). The combustor air supply path 19, the first offgas supply path 22, and the second offgas supply path 23 are connected to one end face of the combustor 17. A combustion gas path 24 for discharging high-temperature combustion gas generated in the combustor 17 to the outside is connected to the other end surface of the combustor 17. Further, the combustor fuel supply path 18 is connected to a surface different from the surface to which the combustor air supply path 19 and the combustion gas path 24 are connected. An arrow B in FIG. 1 indicates a gas flow in the combustor 17.

  The portion 181 where the combustor fuel supply path 18 is connected to the container of the combustor 17 corresponds to the fuel inlet of the present invention. The portion 191 where the combustor air supply path 19 is connected to the container of the combustor 17 corresponds to the air inlet of the present invention. Further, the part 241 where the combustion gas path 24 is connected to the container of the combustor 17 corresponds to the outlet for the temperature raising gas of the present invention.

  The reformer 13 and the combustor 17 are integrated with each other so that heat can be transferred between the reformer 13 and the combustor 17. The reformer 13 and the combustor 17 are arranged so that the reformer gas flow A and the combustor gas flow B are parallel flows.

  More specifically, the air inlet portion 191 and the off-gas inlet portion in the combustor 17 are disposed adjacent to the mixed gas inlet portions 141 and 161 in the reformer 13. The combustion gas outlet 241 in the combustor 17 is disposed adjacent to the fuel gas outlet 111 in the reformer 13. Further, the fuel inlet 181 in the combustor 17 is arranged on the downstream side of the gas flow B in the combustor 17 with respect to the position adjacent to the high temperature portion a in the reformer.

  The combustor 17 includes a combustor first temperature sensor 171 and a combustor second temperature sensor 172 that detect the temperature in the combustor 17 and output an electric signal corresponding to the temperature to the electronic control device.

  The combustor first temperature sensor 171 is disposed at the inlet of air and off-gas in the combustor 17 and detects the combustion temperature of off-gas at that portion (hereinafter referred to as combustor off-gas combustion temperature).

  The combustor second temperature sensor 172 is disposed at the fuel inlet of the combustor 17 and detects the combustion temperature of the air-fuel mixture at that portion (hereinafter referred to as the combustor air-fuel mixture combustion temperature).

  Next, the control at the time of system startup executed in the present embodiment will be described based on FIG. 3 with reference to FIG. 4 and FIG. Note that the solid line in FIG. 5 indicates the temperature distribution characteristics in the reformer during the partial oxidation reforming operation of the fuel cell system of this embodiment.

  When a power switch (not shown) is turned on, the electronic control device starts control at the time of system startup shown in FIG.

  First, in step S100, the fuel supply to the combustor 17 is started (see FIG. 4a), the air supply to the combustor 17 is started, and the air-fuel mixture is ignited by the spark plug 21 and burned. The device 17 is activated. Thereby, the heat in the combustor 17 is transmitted to the reformer 13, and the average catalyst temperature gradually increases (see FIG. 4b). At this time, air and water vapor are not supplied to the reformer 13 (see FIGS. 4c and d).

  Subsequently, in step S110, the average catalyst temperature detected by the reformer third temperature sensor 133 is compared with the POX start temperature that is the temperature at which the partial oxidation reforming reaction by the catalyst can proceed. The POX startup temperature is stored in advance in the microcomputer.

  Immediately after the system is activated, the average catalyst temperature is lower than the POX activation temperature. At this time, it is determined NO in step S110, and the determination in step S110 is repeated until it is determined YES in step S110. When the average catalyst temperature is equal to or higher than the POX start temperature, YES is determined in step S110, and the process proceeds to step S120.

  In step S120, air supply to the reformer 13 is started (see FIG. 4c), and fuel supply to the reformer 13 is started. Thereby, the reformer 13 starts partial oxidation reforming. Then, the temperature of the catalyst is raised by the partial oxidation reforming reaction heat (see FIG. 4 b), and the reformed gas is supplied to the fuel electrode of the fuel cell 10 to raise the temperature of the fuel cell 10.

  In step S120, fuel, air, and off-gas are supplied to the combustor 17. Then, the catalyst in the reformer 13 is heated with the combustion gas of air and fuel and the combustion gas of off-gas.

  Here, since the fuel inlet portion in the combustor 17 is arranged on the downstream side of the gas flow B in the combustor 17 with respect to the position adjacent to the high temperature portion a in the reformer, the combustion gas of air and fuel Heats the catalyst on the downstream side of the gas flow A in the reformer with respect to the high temperature portion a in the reformer.

  In other words, the catalyst in the vicinity of the high temperature region a in the reformer and the catalyst upstream of the reformer gas flow A from the high temperature region a in the reformer are not heated by the combustion gas of air and fuel. Further, the catalyst in the vicinity of the high temperature portion a in the reformer and the catalyst on the upstream side of the reformer gas flow A from the high temperature portion a in the reformer are cooled by the air before mixing with the fuel.

  Therefore, as shown in FIG. 5, the catalyst in the vicinity of the reformer high temperature portion a and the catalyst in the reformer gas flow A upstream side of the reformer high temperature portion a are prevented from rising in temperature. The catalyst temperature distribution in the reformer during the oxidation reforming operation is smoothed.

  At this time, if the high-temperature part catalyst temperature detected by the reformer second temperature sensor 132 or the combustor mixture combustion temperature detected by the combustor second temperature sensor 172 exceeds a set value, catalyst protection is performed. Therefore, it is desirable to adjust the amount of air supplied to the combustor 17 by the flow rate adjusting valve 20 to lower the combustion temperature of the air-fuel mixture.

  Subsequently, in step S130, the average catalyst temperature detected by the reformer third temperature sensor 133, the reformer inlet gas temperature detected by the reformer first temperature sensor 131, and the autothermal reforming by the catalyst. The ATR starting temperature, which is the temperature at which the quality reaction can proceed, is compared. The ATR start temperature is stored in advance in the microcomputer.

  When at least one of the average catalyst temperature and the reformer inlet gas temperature is lower than the ATR start temperature, NO is determined in step S130, and the determination in step S130 is repeated until YES is determined in step S130. When the average catalyst temperature and the reformer inlet gas temperature rise and both of these temperatures become equal to or higher than the ATR starting temperature, YES is determined in step S130 and the process proceeds to step S140.

  In step S140, supply of water vapor to the reformer 13 is started (see FIG. 4d), and fuel and air are supplied to the reformer 13. Thereby, the reformer 13 starts autothermal reforming. Note that, as indicated by a broken line in FIG. 4 d, the steam supply amount to the reformer 13 may be gradually increased as the average catalyst temperature increases after the start of the autothermal reforming.

  Further, fuel, air, and off-gas are continuously supplied to the combustor 17. Then, the catalyst in the reformer 13 is heated with the combustion gas of air and fuel and the combustion gas of off-gas.

  In step S150, the outlet catalyst temperature detected by the reformer fourth temperature sensor 134, the temperature of the fuel cell 10 detected by the fuel cell temperature sensor 101, and the temperature at which the steam reforming reaction by the catalyst can proceed. Compare with some SR start-up temperature. The SR startup temperature is stored in advance in the microcomputer.

  When at least one of the outlet catalyst temperature and the temperature of the fuel cell 10 is lower than the SR start temperature, NO is determined in step S150, and the determination in step S150 is repeated until YES is determined in step S150.

  When the outlet catalyst temperature and the temperature of the fuel cell 10 rise, and both of these temperatures become equal to or higher than the SR startup temperature, YES is determined in step S150, and the control at the time of system startup ends.

  After the control at the time of starting the system is completed, the process shifts to the steam reforming operation. Specifically, the supply of air to the reformer 13 is stopped (see FIG. 4c), the supply of fuel and steam to the reformer 13 is continued, and steam reforming is started. As shown by a broken line in FIG. 4c, the air supply amount to the reformer 13 may be gradually decreased as the average catalyst temperature rises after starting the autothermal reforming.

  Further, as shown in FIG. 6, during the steam reforming operation, the catalyst temperature immediately after the reformer inlet is lowered due to the endothermic reaction, so off gas is supplied to the combustor 17 and the off gas is burned at the inlet of the combustor 17. The catalyst immediately after the reformer inlet is heated. At this time, when the combustor off-gas combustion temperature detected by the combustor first temperature sensor 171 becomes a set value (for example, 1000 ° C.) or more, air is supplied to the combustor 17 to protect the catalyst and the off-gas. It is desirable to lower the combustion temperature.

  According to the present embodiment, the catalyst at the portion that becomes high in the reformer 13 during the partial oxidation reforming operation is cooled, and the catalyst at the portion that becomes low in the reformer 13 is heated during the partial oxidation reforming operation. Therefore, the catalyst temperature distribution in the reformer 13 during the partial oxidation reforming operation is smoothed, and the catalyst in the reformer 13 can be prevented from locally becoming hot during the partial oxidation reforming operation. Can be prevented.

  Also, during the steam reforming operation, the catalyst temperature immediately after the reformer inlet decreases due to the endothermic reaction. High reforming rate can be obtained.

(Second Embodiment)
A second embodiment of the present invention will be described. In the present embodiment, the configuration of the combustor 17 is changed, and the other parts are the same as those in the first embodiment. Therefore, only different portions from the first embodiment will be described.

  As shown in FIG. 7, many fins 173 are provided on the upstream side of the gas flow in the combustor 17. Further, two baffle plates 174 that zigzag the in-combustor gas flow B are provided on the downstream side of the gas flow in the combustor 17.

  Since the substantial surface area of the container of the combustor 17 is increased by the fins 173, heat transfer between the container of the combustor 17 and the combustion gas in the combustor 17 is promoted, and as a result, the reformer 13 and the combustion are combusted. Heat transfer to and from the vessel 17 is facilitated.

  Further, since the combustion gas whose flow is zigzag by the baffle plate 174 collides with the container of the combustor 17, heat transfer between the container of the combustor 17 and the combustion gas in the combustor 17 is promoted, and as a result Heat transfer between the mass device 13 and the combustor 17 is promoted.

  Therefore, according to the present embodiment, the heat exchange efficiency between the reformer 13 and the combustor 17 is improved, and the same effect as that of the first embodiment can be obtained.

(Third embodiment)
A third embodiment of the present invention will be described. In the present embodiment, the configuration of the combustor 17 is changed, and the other parts are the same as those in the first embodiment. Therefore, only different portions from the first embodiment will be described.

  As shown in FIGS. 8 and 9, the combustor 17 has an L shape, and two adjacent surfaces (in this embodiment, a lower surface and a side surface) in the reformer 13 and two adjacent surfaces in the combustor 17. The surfaces are in contact with each other so that heat can be transferred.

  The reformer fuel supply path 14, the reformer air supply path 15, and the reformer steam supply path 16 are connected near the lower part of the reformer 13.

  The combustor air supply path 19, the first offgas supply path 22, and the second offgas supply path 23 are connected to the lower surface of the combustor 17 so that air and offgas flow toward the lower surface of the reformer 13. It is configured.

  Thus, since the air and off-gas supplied to the combustor 17 flow toward the lower surface of the reformer 13, the heat exchange efficiency between the air and off-gas and the catalyst immediately after the reformer inlet is improved.

  More specifically, during the partial oxidation reforming operation, the catalyst in the vicinity of the high temperature region in the reformer and the catalyst on the upstream side of the reformer gas flow A from the high temperature region in the reformer are supplied to the combustor 17. The air is cooled efficiently.

  Further, during the steam reforming operation, the heat exchange efficiency is improved by heating the lower surface and the side surface of the reformer 13 with the off gas supplied to the combustor 17.

  According to this embodiment, the heat exchange efficiency between the reformer 13 and the combustor 17 is improved, and the same effect as that of the first embodiment can be obtained.

(Fourth embodiment)
A fourth embodiment of the present invention will be described. In the present embodiment, the configuration of the combustor 17 is changed, and the other parts are the same as those in the first embodiment. Therefore, only different portions from the first embodiment will be described.

  As shown in FIGS. 10 and 11, the reformer 13 is provided with a partition wall 175 so that the gas flow in the reformer 13 is U-shaped. The combustor 17 is U-shaped so that the gas flow in the reformer 13 is U-shaped.

  Then, by sandwiching the reformer 13 with the combustor 17, heat radiation from the reformer 13 to the outside during the steam reforming operation is suppressed.

  According to the present embodiment, it is possible to suppress the heat radiation to the outside during the steam reforming operation and to obtain the same effect as that of the first embodiment.

(Other embodiments)
The present invention is not limited to the embodiment described above, and can be appropriately changed within the scope described in the claims.

  The above embodiments are not irrelevant to each other and can be combined as appropriate unless the combination is clearly impossible.

  In each of the above-described embodiments, it is needless to say that elements constituting the embodiment are not necessarily essential unless explicitly stated as essential and clearly considered essential in principle. Yes.

  Further, in each of the above embodiments, when numerical values such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment are mentioned, it is clearly limited to a specific number when clearly indicated as essential and in principle. The number is not limited to the specific number except for the case.

  Further, in each of the above embodiments, when referring to the shape, positional relationship, etc. of the component, etc., the shape, unless otherwise specified and in principle limited to a specific shape, positional relationship, etc. It is not limited to the positional relationship or the like.

DESCRIPTION OF SYMBOLS 10 Fuel cell 13 Reformer 17 Combustor 111 Fuel gas outlet part 141 Reformation target fluid inlet part 161 Reformation target fluid inlet part 181 Fuel inlet part 191 Air inlet part 241 Heating gas outlet part

Claims (4)

A fuel cell (10) for generating electrical energy by an electrochemical reaction between an oxidant gas and a fuel gas;
A reformer (13) that reforms a fluid to be reformed with a catalyst to generate the fuel gas;
A combustor (17) for generating a temperature raising gas for raising the temperature of the reformer by burning air and fuel,
The reformer and the combustor are arranged in contact with each other so that heat can be transferred,
The inlet portion (191) of the air in the combustor is disposed adjacent to the inlet portion (141, 161) of the reforming target fluid in the reformer,
The temperature raising gas outlet (241) in the combustor is disposed adjacent to the fuel gas outlet (111) in the reformer,
The fuel inlet portion (181) in the combustor is located in the combustor rather than a position adjacent to the high temperature portion (a) in the reformer that becomes high in the reformer during the partial oxidation reforming operation. A fuel cell system, wherein the fuel cell system is disposed downstream of a gas flow. Temperature detecting means (132) for detecting the temperature of the high temperature portion in the reformer;
A flow rate adjusting valve (20) for changing the flow rate of the air supplied to the combustor,
2. The fuel cell system according to claim 1, wherein the flow rate of the air is adjusted by operating the flow rate adjustment valve in accordance with the temperature of the high temperature portion in the reformer detected by the temperature detection unit. .   The fuel cell system according to claim 1 or 2, wherein the combustor includes a fin (173) that promotes heat transfer between the reformer and the combustor. The reformer is a rectangular parallelepiped,
The combustor is L-shaped,
4. The fuel cell according to claim 1, wherein two adjacent surfaces of the reformer and two adjacent surfaces of the combustor are in contact with each other so as to allow heat transfer. system.

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