JP2008243597A - Fuel cell device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cell device capable of supplying sufficiently a raw fuel to a fuel cell. <P>SOLUTION: The fuel cell device is equipped with a housing container 1, fuel battery cells 4a housed in the housing container 1, a reforming catalyst part 3a which reforms a raw fuel in order to supply a fuel gas to the fuel battery cells 4a housed in the housing container 1, and a raw fuel supply line for supplying the raw fuel to the reforming catalyst part 3a, and burns the gas which passes the reforming catalyst part 3a and is not used in power generation. The fuel cell device is equipped with a gas pump 18 for directly supplying the raw fuel to the fuel battery cells 4a at the downstream side than the reforming catalyst part 3a. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fuel cell device, and in particular, includes a solid oxide fuel cell and a reforming catalyst part in a storage container, and a raw fuel supply means for supplying raw fuel to the reforming catalyst part. The present invention relates to a fuel cell device.

  In recent years, fuel cells of solid polymer type, phosphoric acid type, molten carbonate type and solid oxide type have been proposed as next-generation energy. In particular, solid oxide fuel cells have advantages such as high operating temperature, high power generation efficiency, and use of exhaust heat, and research and development are being promoted.

In a conventional fuel cell device, a solid oxide fuel cell and a reformer are housed in a storage container, oxygen-containing gas supply means for supplying an oxygen-containing gas to the fuel cell, and raw fuel is supplied to the reformer A raw fuel supply means for supplying air, an air supply means for supplying air, and a water supply means for supplying water, and supplying an oxygen-containing gas to the fuel cell by the oxygen-containing gas supply means during the starting process On the other hand, the raw fuel is supplied to the fuel cell through the reformer by the raw fuel supply means, the gas not used for power generation is burned, the reformer is heated by this combustion gas, and the inside of the module Heating has been performed (see, for example, Patent Document 1).
JP 2006-86016 A

  However, in the conventional fuel cell device, since the raw fuel is supplied to the fuel cell through the reformer at the initial stage of the start-up process, the pressure loss at the reforming catalyst portion of the reformer is high. It was difficult to supply a large amount of raw fuel.

  That is, a large pressure is required for the raw fuel to pass through the reforming catalyst portion of the reformer. For this reason, if an attempt is made to increase the supply pressure, an expensive pump is required, whereas if an inexpensive pump is used. In order to reduce the raw fuel passing through the reformer, increase the module temperature, and sufficiently increase the reformer temperature in a sufficiently short time, there is a problem that the supply amount of the raw fuel is small.

  An object of this invention is to provide the fuel cell apparatus which can fully supply raw fuel to a fuel cell.

  The fuel cell device of the present invention includes a storage container, a solid oxide fuel cell stored in the storage container, and a raw material for supplying fuel gas to the solid oxide fuel cell stored in the storage container. A reforming catalyst unit for reforming the fuel; a raw fuel supply unit for supplying the raw fuel to the reforming catalyst unit; and a water supply unit for supplying water to the reforming catalyst unit. A fuel cell device for combusting a gas that has passed through the reforming catalyst part and has not been used for power generation, and a raw fuel direct supply means for directly supplying raw fuel to the solid oxide fuel cell; And a controller for controlling the raw fuel direct supply means, the raw fuel supply means, and the water supply means.

  In such a fuel cell apparatus, since the raw fuel can be supplied to the fuel cell by the raw fuel direct supply means without going through the reforming catalyst unit, the raw fuel direct supply means including an inexpensive pump having a low supply pressure is used. However, the raw fuel can be sufficiently supplied to the fuel cell, and this raw fuel can be burned, whereby the module (fuel cell) temperature and the reforming catalyst temperature can be sufficiently increased in a short time. The start-up of the device can be accelerated.

  In the fuel cell device of the present invention, the solid oxide fuel cell is an internal reforming type. In such a fuel cell device, the raw fuel that could not be completely reformed by the reforming catalyst unit can be reformed by the solid oxide fuel cell.

  Furthermore, the fuel cell device of the present invention comprises an oxygen-containing gas direct supply means for directly supplying an oxygen-containing gas to the solid oxide fuel cell. In such a fuel cell device, by supplying an oxygen-containing gas to the fuel cell together with the raw fuel, the raw fuel is combusted, the vicinity of the combustion gas of the fuel cell is heated, and the solid oxide fuel cell is heated. Internal reforming begins to be performed in part, and carbon begins to precipitate together with this, but since the oxygen-containing gas is supplied, the carbon is oxidized and released as carbon dioxide, thereby preventing carbon deposition. Further, when an internal reforming type solid oxide fuel cell is used, the partial oxidation reaction occurs not in the reforming catalyst but in the solid oxide fuel cell, thus preventing deterioration of the reforming catalyst due to heat generation. be able to.

  In the fuel cell device of the present invention, the control unit controls the raw fuel directly to the solid oxide fuel cell by the raw fuel direct supply means at the initial stage of the startup processing step. To do. In such a fuel cell device, by burning the raw fuel at the initial stage of the start-up process step, the fuel cell can be heated and the reforming catalyst section can be heated, so that the start-up of the fuel cell can be accelerated and modified. It is possible to accelerate the reforming in the quality device.

  Furthermore, in the fuel cell device of the present invention, the control unit supplies the raw material to the solid oxide fuel cell by the raw fuel direct supply means until the temperature of the reforming catalyst unit reaches a predetermined temperature at which steam reforming is possible. Control is performed so that fuel is directly supplied, and when the temperature of the reforming catalyst section reaches a predetermined temperature at which steam reforming is possible, the raw fuel is supplied by the raw fuel supply means, and water is supplied by the water supply means. It controls to supply to a part.

  In such a fuel cell device, in the start-up process step, the raw fuel is supplied to the fuel cell using the raw fuel direct supply means and burned, thereby increasing the temperature inside the module and the temperature of the reforming catalyst section. However, when the raw fuel is supplied by the raw fuel direct supply means until the temperature of the reforming catalyst section reaches a predetermined temperature at which steam reforming can be performed, and the temperature of the reforming catalyst section reaches a predetermined temperature at which steam reforming can be performed. The raw fuel supply means and the water supply means can supply the raw fuel and water to the reforming catalyst unit to perform steam reforming, which is an endothermic reaction, until the steam reforming with the highest reforming efficiency is performed. You can save time.

  Further, the fuel cell device of the present invention includes an oxygen-containing gas supply means for supplying an oxygen-containing gas to the reforming catalyst unit, and the control unit is configured such that the temperature of the reforming catalyst unit is partially oxidized. Control is performed so that the raw fuel is directly supplied to the solid oxide fuel cell by the raw fuel direct supply means until the reformable temperature reaches a predetermined temperature, and the temperature of the reforming catalyst can be partially oxidized and reformed. When the temperature reaches a predetermined temperature, the raw fuel is supplied by the raw fuel supply means and the oxygen-containing gas is supplied by the oxygen-containing gas supply means to the reforming catalyst unit.

  In such a fuel cell device, in the start-up process step, the raw fuel is supplied to the fuel cell using the raw fuel direct supply means and burned, thereby increasing the temperature inside the module and the temperature of the reforming catalyst section. However, the raw fuel is directly supplied by the raw fuel direct supply means until the temperature of the reforming catalyst part reaches a predetermined temperature at which partial oxidation reforming is possible. When the temperature reaches, the raw fuel supply means and the oxygen-containing gas supply means can supply the raw fuel and the oxygen-containing gas to the reforming catalyst section, and can perform partial oxidation reforming which is an exothermic reaction until the reforming is performed. Can be shortened. After that, when the temperature of the reforming catalyst part reaches a predetermined temperature at which steam reforming is possible, the supply of oxygen-containing gas to the reforming catalyst part is stopped, while the supply of water to the reforming catalyst part is started. In addition, steam reforming with the highest reforming efficiency can be performed.

  In the fuel cell device of the present invention, the raw fuel can be supplied to the fuel cell by the raw fuel direct supply means without going through the reforming catalyst section. Therefore, even if an inexpensive pump with a low supply pressure is used, The battery can be sufficiently supplied and the raw fuel is burned, whereby the module temperature and the reforming catalyst temperature can be sufficiently increased in a short time, and the start-up of the fuel cell device can be accelerated.

  Hereinafter, an embodiment of the fuel cell device of the present invention will be described. FIG. 1 is a schematic configuration diagram showing an outline of a fuel cell device.

  As shown in FIG. 1, the fuel cell device is configured such that a reformer 3 and a cell stack 4 are accommodated in a storage container 1. The reformer 3 includes a reforming catalyst unit 3a for reforming raw fuel. A water vaporization unit 3b is formed on the upstream side of the reforming catalyst unit 3a, and a gas preheating unit 3c is formed on the downstream side of the reforming catalyst unit 3a. The cell stack 4 is configured by standing a plurality of fuel cells (fuel cells) 4a on a gas manifold 4b.

  The reformer 3 of the storage container 1 can be supplied with raw fuel such as city gas and propane gas from the outside by the gas pump 2, can be supplied with water by the water pump 7, and is further supplied by the air pump 9. In addition, an oxygen-containing gas such as air can be supplied.

  The reformer 3 is capable of partial oxidation reforming and steam reforming using raw fuel, water, and oxygen-containing gas, and the fuel gas reformed by the reformer 3 is supplied to the fuel cell 4a of the cell stack 4. It is configured to be supplied. The gas pump 2, the water pump 7, and the air pump 9 can be controlled by the control unit 10. The broken line in FIG. 1 indicates a main signal from the control device 10 or a main signal to the control unit 10.

  In addition, air (oxygen-containing gas) for power generation is supplied into the storage container 1 through the air introduction pipe 13 by the air blower 11.

  That is, the reformer 3 and the gas manifold 4b are connected by the pipe 14, and the fuel gas reformed by the reforming catalyst portion 3a of the reformer 3 is supplied to the gas manifold 4b. Yes. The fuel battery cell 4a has a gas passage through which fuel gas flows, and the fuel gas is passed through the gas passage of the fuel battery cell 4a from within the manifold 4b and used for the power generation reaction. Is discharged above the fuel cell 4a (combustion region F) through the gas passage. On the other hand, air is supplied into the storage container 1 from the air introduction pipe 13 by the air blower 11, and the air that has not been used for the power generation reaction is directed upward of the fuel cell 4a.

  In this embodiment, the surplus fuel gas released above the fuel cell 4a (combustion region F) is used as the combustion fuel gas.

  That is, in this embodiment, the combustion region F in which surplus fuel gas discharged above the cell stack 4 burns, in other words, the ignition heater 15 as ignition means, the combustion state of the fuel gas, above the cell stack 4. Is provided above the combustion region F, and the reformer 3 is heated by the combustion of the fuel gas discharged from the cell stack 4. It is configured. The fuel cell 4a is, for example, a hollow plate type solid oxide fuel cell 4a, in which a fuel electrode layer mainly composed of Ni is formed inside an electrolyte made of solid oxide, and an air electrode is formed outside. The gas passing through the inside of the fuel cell 4a is internally reformed.

  Since the temperature of the reformer 3 is low in the initial stage of the start-up, the raw fuel is not reformed even if it is supplied to the reformer 3 until the reformer 3 performs reforming. The fuel cell 4a is discharged from above through the gas manifold 4b and burned.

  The ignition heater 15 uses the generated heat as an ignition source for combustion, and the ignition heater 15 made of ceramic becomes a high temperature of about 1000 ° C. and functions sufficiently as an ignition source. Accordingly, the ignition heater 15 is preferably a ceramic heater from the viewpoint of durability. For example, a heating element made of W, Mo or the like is covered with a ceramic such as alumina, silicon carbide, or silicon nitride.

  As the temperature sensor 17, a K-type thermocouple that can measure a temperature of 1000 ° C. or higher and that is fast in response and inexpensive can be used. Further, the temperature sensor 17 is arranged so as not to detect the radiant heat from the ignition heater 15 as much as possible. Therefore, the fuel gas blown out from the cell stack 4 is ignited by the ignition heater 15, the fuel gas is combusted, the temperature of the reformer 3 is increased, and the raw fuel is reformed. The combusted exhaust gas is discharged from the exhaust pipe 19 to the outside of the storage container 1. A signal from the temperature sensor 17 is sent to the control unit 10, and energization of the ignition heater 15 can be controlled by the control unit 10.

  In the fuel cell device according to the present invention, the raw fuel is supplied to the gas manifold 4b separately from the raw fuel supply line L1 for supplying the raw fuel to the reformer 3 in the pipe 14 downstream of the reforming catalyst portion 3a. The raw fuel direct supply line L2 for releasing the fuel cell 4a above the fuel cell 4a, in other words, the raw fuel is directly supplied to the fuel cell 4a without passing the raw fuel through the reforming catalyst unit 3a. The fuel direct supply line L2 is connected, and the gas pump 18 provided in the line L2 is controlled by the control unit 10.

  A method for starting the fuel cell device configured as described above will be described with reference to FIG. When activation of the fuel cell device is started, first, activation processing that is preparation for power generation is performed.

  First, in S <b> 1, the air blower 11 is activated to supply air into the storage container 1. Here, at the time of ignition operation, if the supply amount by the air blower 11 is large, the flame may be blown out. Therefore, the flow rate is set small (for example, 40 L / min). Since the air supply by the air blower 11 reaches the combustion region F above the fuel battery cell 4a and there is a risk of blowing out the flame of the fuel battery cell 4a, the air supply amount by the air blower 11 is reduced, so that the combustion region The amount of air supplied to F can be reduced. Thereafter, in S2, the ignition heater 15 is energized to preheat the ignition heater 15.

  Thereafter, in S3, the gas pump 18 of the raw fuel direct supply line L2 is driven to supply the raw fuel to the pipe 14 on the downstream side of the reforming catalyst portion 3a of the reformer 3, and the raw fuel is supplied via the gas manifold 4b. The fuel cell 4a is discharged upward, and the mixed gas of air and raw fuel by the air blower 11 is ignited and burned by the heat generated by the ignition heater 15, and the temperature in the storage container 1 is increased by the combustion gas. And the reformer 3 is heated.

  Since the raw fuel is discharged above the fuel cell 4a from the pipe 14 downstream of the reforming catalyst unit 3a without passing through the reforming catalyst unit 3a of the reformer 3, the supply of the raw fuel is hindered. There is nothing, and it can be smoothly discharged upward from the fuel cell 4a. As a result, a large amount of raw fuel can be easily supplied at a low pressure as a combustion gas for heating the fuel cell 4a and the reformer 3, and the fuel cell 4a and the reformer 3 Heating can be performed quickly.

  Thereafter, it is determined whether or not partial oxidation reforming is possible in S4. Whether or not partial oxidation reforming is possible is determined, for example, when the module temperature is 100 ° C. or higher and the temperature inside the reformer is 200 ° C. or higher.

  If it is determined that partial oxidation reforming is possible, the gas pump 2 and the air pump 9 are driven in S5 to supply raw fuel and air to the reformer 3 to perform partial oxidation reforming. Thereafter, the gas pump 18 is stopped in S6. The fuel gas reformed by the reforming catalyst unit 3a of the reformer 3 passes through the gas passage of the fuel cell 4a via the manifold 4b, and the surplus fuel gas that has not been used for the power generation reaction is in the combustion region. The fuel cell 4a and the reformer 3 are heated.

  Thereafter, it is determined in S7 whether autothermal reforming (ATR) is possible. Autothermal reforming is a combined operation of partial oxidation reforming and steam reforming. When changing directly from partial oxidation reforming to steam reforming, the gas type and amount of gas change abruptly. Whether or not autothermal reforming (ATR) is possible is, for example, the module temperature is 200 ° C. or higher and the temperature inside the reformer is 650 ° C. or higher. If possible, it is determined to be possible. Partial oxidation reforming is an exothermic reaction, but steam reforming is an endothermic reaction, so if the temperature rises above a certain level so that the module temperature and reformer temperature can be maintained even after shifting to steam reforming. Judge that autothermal reforming (ATR) is possible.

  If it is determined that autothermal reforming (ATR) is possible, the water pump 7 is driven in S8 to supply water (to become steam) to the reformer 3, while the air supply amount by the air pump 9 The autothermal reforming (ATR) is performed in the reformer.

  Thereafter, it is determined whether or not steam reforming is possible in S9. Since steam reforming is an endothermic reaction, whether steam reforming is possible or not is determined as possible, for example, when the module temperature is 400 ° C. or higher and the temperature inside the reformer is 550 ° C. or higher. .

  If it is determined that steam reforming is possible, the drive of the air pump 9 is stopped in S10, and the air supply by the air pump 9 is stopped. On the other hand, the amount of water supplied by the water pump 7 is increased to perform steam reforming.

  Then, after the air pump 9 is stopped, energization to the ignition heater 15 is stopped after a lapse of a certain time. The fixed time is a temperature at which the module temperature is sufficiently high and spontaneous ignition occurs.

  In the fuel cell device as described above, since the raw fuel can be supplied to the fuel cell 4a by the gas pump 18 without going through the reforming catalyst portion 3a, the raw fuel can be used even if the inexpensive gas pump 18 having a low supply pressure is used. Can be sufficiently supplied to the fuel battery cell 4a, and this raw fuel is burned, whereby the temperature of the fuel battery cell 4a can be increased and the temperature of the reformer 3 can be sufficiently increased in a short time. Can be started earlier.

  In addition, the control unit 10 energizes the ignition heater 15 during the startup process, and ignites and burns the gas that has not been used in the power generation reaction, but the control unit 10 continues to the ignition heater 15 during the startup process. Since energization is performed, the ignition reliability during the startup process can be improved with simple control.

  That is, the partial oxidation reforming of the raw fuel is performed, for example, by supplying a predetermined amount of air and raw fuel to the reformer 3, and the steam reforming is performed, for example, by supplying water and raw fuel to the reformer. Since the gas type and the amount of gas used in each reforming are different, the autothermal reforming (ATR) is performed even if the ignition heater is ignited once during partial oxidation reforming. ) Or in the steam reforming stage, but in the present invention, the ignition heater 15 is energized continuously during the start-up process. Reignition can improve ignition reliability.

  FIG. 3 shows another embodiment of the present invention. In this embodiment, a raw fuel direct supply line L2 for supplying raw fuel is connected to the pipe 14, and the fuel is disposed downstream of the reforming catalyst section 3a. An oxygen-containing gas direct supply means for directly supplying the oxygen-containing gas to the battery cell 4a, in other words, for supplying the oxygen-containing gas directly to the fuel battery cell 4a to the pipe 14 on the downstream side of the reforming catalyst portion 3a. The oxygen-containing gas direct supply line L3 is connected, and the air pump 25 provided in the oxygen-containing gas direct supply line is controlled by the control unit 10.

  In such a fuel cell apparatus, as shown in FIG. 4, first, in S <b> 1, the air blower 11 is activated to supply air into the storage container 1. Thereafter, in S2, the ignition heater 15 is energized to preheat the ignition heater 15.

  Thereafter, in S3, the gas pump 18 and the air pump 25 are driven to supply the raw fuel and air to the pipe 14 on the downstream side of the reforming catalyst portion 3a of the reformer 3, and the raw fuel and air are supplied to the gas manifold 4b. Through the fuel cell 4a, and the mixed gas of air and raw fuel is ignited by the heat generated by the ignition heater 15 and combusted. With this combustion gas, the temperature in the storage container 1 rises, and The reformer 3 is heated.

  Since the raw fuel is discharged above the fuel cell 4a from the pipe 14 downstream of the reforming catalyst unit 3a without passing through the reforming catalyst unit 3a of the reformer 3, the supply of the raw fuel is hindered. There is nothing, and it can be smoothly discharged upward from the fuel cell 4a. As a result, a large amount of raw fuel can be easily supplied as a combustion gas for heating the fuel cell 4a and the reformer 3, and the fuel cell 4a and the reformer 3 can be heated quickly. Can be done.

  Further, since air is discharged through the fuel cell 4a from the pipe 14 on the downstream side of the reforming catalyst unit 3a without passing through the reforming catalyst unit 3a of the reformer 3, the supply of air is performed. There is nothing to block, and a large amount of air can be smoothly discharged upward from the fuel cell 4a. Therefore, by supplying air to the fuel cell together with the raw fuel, the raw fuel is combusted, the vicinity of the combustion gas of the fuel cell is heated, and internal reforming is performed in the heated portion of the solid oxide fuel cell. At first, there is a possibility that carbon is deposited along with this. However, since air is supplied at the same time, the carbon is oxidized and released as carbon dioxide, and the carbon deposition at the fuel electrode of the fuel cell 4a can be suppressed.

  FIG. 5 shows still another embodiment of the present invention. In this embodiment, a raw fuel direct supply line L2 for supplying raw fuel is connected to the gas manifold 4b, and an oxygen-containing gas direct supply line is connected to the gas manifold 4b. L3 is connected. Even in such a fuel cell device, it is possible to obtain substantially the same effect as in the above embodiment, but in this embodiment, the portion to which the raw fuel direct supply line L2 and the oxygen-containing gas direct supply line L3 are further connected is a pipe. Since it is connected to the gas manifold 4b having a wider space (having a larger cross-sectional area), it becomes easier to supply the gas and a pump with a low supply pressure can be used.

  In the above embodiment, the raw fuel direct supply line L2 and the oxygen-containing gas direct supply line L3 are connected to the pipe 14 and the gas manifold 4b. However, in the present invention, the downstream side of the reforming catalyst section 3a. On the side, for example, a reformer may be used.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to such embodiments, and various modifications and corrections can be made without departing from the scope of the present invention. It goes without saying that this is possible.

  For example, in the above embodiment, the two gas pumps 2 and 18 for pumping the raw fuel, that is, the gas pump 2 of the raw fuel supply line L1 and the gas pump 18 of the raw fuel direct supply line L2 are described. A changeover switch or the like may be provided so that the raw fuel is supplied to the reformer 3 or the pipe 14 with two gas pumps. In such a fuel cell device, since there is only one gas pump, it can be inexpensive, and when it is necessary to supply a large amount of raw fuel, it is supplied without going through the reforming catalyst section, so the gas pump has a high supply capacity However, an inexpensive gas pump can be used.

  3 and 5, the two air pumps 9 and 25 for pumping air have been described. However, air is supplied to the reformer 3 or the pipe 14 with one air pump. For example, a changeover switch or the like may be provided. In such a fuel cell device, since there is only one air pump, it can be made inexpensive, and when it is necessary to supply a large amount of air, it is supplied without going through the reforming catalyst unit, so a high supply to the air pump An inexpensive air pump can be used without requiring a capacity.

  In the above embodiment, the fuel cell device provided with a specific reformer above the cell stack has been described. However, the present invention can be applied even when the reformer is provided outside the cell stack. .

  Further, in the above embodiment, the case where air is supplied to the outer surface of the fuel cell and the fuel gas is supplied to the inside is described. However, the present invention is a case where air is supplied to the inside of the fuel cell and fuel gas is supplied to the outside. It can be applied even if it exists. In this case, it goes without saying that an air electrode is formed inside the fuel cell and a fuel electrode is formed outside.

  In the above embodiment, the present invention is applied when steam reforming is performed after partial oxidation reforming. However, the present invention also applies when steam reforming is performed without performing partial oxidation reforming. Applicable. In this case, the time until the steam reforming with the highest reforming efficiency can be shortened. Moreover, since the partial oxidation reaction occurs not in the reforming catalyst but in the solid oxide fuel cell, it is possible to prevent the reforming catalyst from being deteriorated due to heat generation.

It is sectional drawing which shows embodiment of the fuel cell apparatus of this invention. It is a flowchart which shows the starting method of the fuel cell apparatus of this invention. It is sectional drawing which shows the other form of this invention which connected the oxygen-containing gas direct supply line also to piping. It is a flowchart which shows the starting method of the fuel cell apparatus of FIG. FIG. 7 is a cross-sectional view showing still another embodiment of the present invention in which a raw fuel direct supply line and an oxygen-containing gas direct supply line are connected to a gas manifold.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Storage container 2, 18 ... Gas pump 3 ... Reformer 3a ... Reforming catalyst part 4 ... Cell stack 4a ... Fuel cell (fuel cell)
7 ... Water pump 9, 25 ... Air pump 10 ... Control unit 15 ... Ignition heater F ... Combustion region

Claims (6)

A storage container, a solid oxide fuel cell stored in the storage container, and a reforming catalyst stored in the storage container for reforming raw fuel to supply fuel gas to the solid oxide fuel cell And a raw fuel supply means for supplying raw fuel to the reforming catalyst section, and a water supply means for supplying water to the reforming catalyst section. A fuel cell apparatus for combusting gas that has passed and was not used for power generation, wherein the raw fuel direct supply means for directly supplying raw fuel to the solid oxide fuel cell, the raw fuel direct supply means, A fuel cell apparatus comprising: a raw fuel supply unit; and a control unit that controls the water supply unit. 2. The fuel cell device according to claim 1, wherein the solid oxide fuel cell is an internal reforming type. 3. The fuel cell device according to claim 2, further comprising an oxygen-containing gas direct supply means for directly supplying an oxygen-containing gas to the solid oxide fuel cell. 4. The control unit according to claim 1, wherein the control unit performs control so that the raw fuel is directly supplied to the solid oxide fuel cell by the raw fuel direct supply unit at an initial stage of the startup processing step. The fuel cell device described in 1. The control unit performs control so that the raw fuel is directly supplied to the solid oxide fuel cell by the raw fuel direct supply unit until the temperature of the reforming catalyst unit reaches a predetermined temperature capable of steam reforming. When the temperature of the reforming catalyst part reaches a predetermined temperature at which steam reforming is possible, the raw fuel supply means is controlled to supply raw fuel, and the water supply means is controlled to supply water to the reforming catalyst part. 5. The fuel cell device according to claim 1, wherein the fuel cell device is a fuel cell device. Oxygen-containing gas supply means for supplying oxygen-containing gas to the reforming catalyst unit, the control unit, until the temperature of the reforming catalyst unit reaches a predetermined temperature capable of partial oxidation reforming, When the raw fuel is directly supplied to the solid oxide fuel cell by the raw fuel direct supply means, the raw fuel supply is performed when the temperature of the reforming catalyst part reaches a predetermined temperature at which partial oxidation reforming is possible. 5. The fuel cell device according to claim 1, wherein raw fuel is controlled by the means, and oxygen-containing gas is supplied to the reforming catalyst unit by the oxygen-containing gas supply means.

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