JP6214364B2 - Fuel cell system - Google Patents

Description

  The present invention relates to a fuel cell system, and more specifically, a fuel cell power generation apparatus having a fuel cell main body and a fuel reforming unit that generates a fuel gas used in a power generation reaction in the fuel cell main body, and a fuel reforming unit A water supply device for supplying the reforming water used for steam reforming performed in step 1 to the fuel cell power generation device, an impurity removal device for performing an impurity removal treatment on the water used as the reforming water by the water supply device, and each of the above The present invention relates to a fuel cell system including a control device that controls operation of the device.

  Conventionally, an impurity removing device is provided in a fuel cell system, and an impurity removing process is performed on water used as reforming water. For example, impurities contained in water include ionic substances such as salts and ammonia dissolved by ionization, and organic substances such as microorganisms and oils. Among these, ions and dissolved ionic substances such as salts and ammonia can be removed by using, for example, an impurity removing apparatus including an ion exchange resin. Further, organic substances can be adsorbed and removed using an impurity removing device equipped with an adsorbent such as activated carbon.

  However, if fungi grow in the water, the fungus attaches to the ion exchange resin or adsorbent and its performance deteriorates, and the water quality after treatment with the impurity removal device may deteriorate, Stenosis can occur. Therefore, it is necessary to take measures to prevent the bacteria from degrading the performance of the impurity removing device.

Patent Document 1 describes heating the water to a temperature higher than the temperature at which the bacteria are killed in view of the problem that when the bacteria propagate in the water, the equipment and piping constituting the impurity removal device are blocked. Specifically, in the fuel cell system described in Patent Document 1, the temperature of the water is intermittently increased so that the temperature of the water is increased when a predetermined time elapses at a temperature at which the bacteria can propagate. To prevent the growth of bacteria.
Patent Document 1 describes examples of using exhaust heat from a fuel cell power generation device and examples of using heat from an electric heater as means for increasing the temperature of water. That is, in order to carry out the anti-bacterial operation of raising the temperature of water, the generated power and exhaust heat from the fuel cell power generator are used.

JP 2010-170877 A

  When operating the fuel cell power generation device, the power demand unit from the fuel cell power generation device based on the time series prediction value of the power demand in the power demand unit and the time series prediction value of the heat demand in the heat demand unit. In general, an operation plan process for deriving a time-sequential output plan value of the fuel cell power generator for supplying power to the heat supply unit and supplying heat to the heat demand unit is performed.

However, in the fuel cell system described in Patent Document 1, in addition to the power consumption in the power demand section and the heat consumption in the heat demand section, the fuel cell power generator is configured to perform the above-described bacteria countermeasure operation. It consumes generated power and exhaust heat. Therefore, the power and heat from the fuel cell power generation apparatus that should have been originally available in the power demand section and the heat demand section will change unexpectedly. And when there is a shortage of power or heat, purchase power from a commercial power system to procure the shortage of power, or operate other heat source equipment to procure the shortage of heat Etc. are required. As a result, if the power required by the power demand section and the heat required by the heat demand section are covered by the power and heat supplied from the fuel cell power generator, the operating merit should have been high, There is a problem that the driving merit is temporarily reduced in accordance with the anti-fungal operation.
That is, in the fuel cell system described in Patent Document 1, whether or not to perform the bacteria countermeasure operation is determined based on the elapsed time since the previous bacteria countermeasure operation was performed, We do not consider whether it is in state. Therefore, there is a problem that the anti-bacterial operation is performed even at an unfavorable timing in view of the operating state of the fuel cell power generation device (for example, at an unfavorable timing at which the driving merit is greatly reduced).

  The present invention has been made in view of the above-described problems, and the object thereof is to enable the anti-bacterial operation at a timing that can prevent the growth of bacteria and avoid the significant decrease in the operation merit of the fuel cell power generation device. It is in providing a fuel cell system.

In order to achieve the above object, the fuel cell system according to the present invention includes a fuel cell main body that generates power using fuel gas and an oxidant gas, and steam reforming a raw fuel containing hydrocarbons. A fuel cell power generator having a fuel reforming unit that generates the fuel gas used in a power generation reaction in the fuel cell body;
A water supply device for supplying reforming water used for steam reforming performed in the fuel reforming unit to the fuel cell power generation device;
An impurity removal device that performs an impurity removal treatment on water used as the reforming water by the water supply device;
A control device for controlling the operation of each of the devices,
The control device generates power from the fuel cell power generation device to the power demand unit based on a time series forecast value of power demand in the power demand unit and a time series forecast value of heat demand in the heat demand unit. supplying a fuel cell system that performs the operation planning process of deriving the time-series output planned value of the fuel cell power generator for supplying heat to the heat demand unit,
A water temperature adjusting device for adjusting the temperature of water to be subjected to impurity removal processing by the impurity removing device using heat output from the fuel cell power generation device;
The water temperature adjusting device is configured so that the temperature of the water to be subjected to the impurity removal process is maintained at a high temperature side reference temperature or higher during a reference period at a predetermined start timing of the bacteria countermeasure operation. implemented bacteria measures operation for operating and is configured to start timing of the next of said fungal measures operated to implement the timing determination process of determining between the implementation period of the next bacteria countermeasures operation,
In the timing determination process, the control device calculates the output planned value of the fuel cell power generation device during the execution target period of the next germ countermeasure operation, which is derived by the operation plan process, as a predetermined countermeasure operation. Deriving the degree of decrease in driving merit predicted when changing to satisfy the possible condition, and determining the timing at which the degree of decrease in driving merit is considered the smallest as the start timing of the next antimicrobial operation It is in.

According to the above characteristic configuration, the control device satisfies the predetermined countermeasure operation condition for the output planned value of the fuel cell power generation device during the execution target period of the next bacteria countermeasure operation derived by the operation planning process. A timing determination process is performed in which the degree of reduction in driving merit predicted when the change is made in this way is derived, and the timing at which the degree of reduction in driving merit is considered to be the smallest is determined as the start timing of the next antimicrobial operation. In other words, the control device changes the time condition of “being within the target period for the next fungus countermeasure operation” and “the planned output value of the fuel cell power generator so that the predetermined countermeasure operation enable condition is satisfied. The start timing of the next anti-bacterial measure operation is determined in advance based on the condition relating to the operating state of the fuel cell power generation device that the degree of decrease in the driving merit predicted when the Then, the bacteria countermeasure operation is carried out. As a result, the propagation of bacteria can be prevented by taking into account the temporal condition of “being in the target period for the next bacteria countermeasure operation”. In addition, the condition regarding the operating state of the fuel cell power generation device is that “the degree of decrease in the operation merit predicted when the planned output value of the fuel cell power generation device is changed so as to satisfy the predetermined countermeasure operation possible condition” is the smallest. By taking this into consideration, it is possible to avoid the occurrence of the problem that the anti-bacterial operation is performed at an unfavorable timing in view of the operating state of the fuel cell power generation device (that is, an unfavorable timing at which the operation merit is greatly reduced).
Therefore, it is possible to provide a fuel cell system capable of preventing germs from being propagated and capable of carrying out a germ countermeasure operation at a timing at which a significant reduction in the operation merit of the fuel cell power generator can be avoided.

Another characteristic configuration of the fuel cell system according to the present invention is that the temperature of water to be subjected to the impurity removal process is between the reference period and the control device regardless of whether or not the bacteria countermeasure operation is being performed. If the temperature is maintained at a temperature equal to or higher than the high temperature side reference temperature or below a low temperature side reference temperature lower than the high temperature side reference temperature, it is determined that the bacteria countermeasure operation is completed, and the timing determination process is performed.

The purpose of the anti-bacterial operation is to prevent the bacteria from breeding in the water to be subjected to the impurity removal process. Therefore, regardless of whether or not the control device is performing anti-bacterial operation, the temperature of the water to be subjected to the impurity removal treatment is higher than the high temperature side reference temperature or lower than the high temperature side reference temperature during the reference period. If the temperature is maintained below the reference temperature, the object of preventing the growth of bacteria is achieved. In addition, if the effect of preventing the growth of bacteria is substantially obtained as described above, but the bacteria countermeasure operation is further performed at the start timing of the next preset bacteria countermeasure operation, Preventive measures are implemented more than necessary, and energy used for anti-bacterial operation is consumed more than necessary.
Therefore, in this feature configuration, regardless of whether or not the bacteria countermeasure operation is being performed, the temperature of the water that is the target of the impurity removal treatment is higher than or equal to the high temperature side reference temperature during the reference period or the high temperature side reference temperature. If the temperature is maintained below the lower reference temperature , the timing is determined to be complete , the timing determination process is performed, and the start timing of the next bacteria countermeasure operation is determined again. That is, the countermeasure for preventing the propagation of bacteria is not carried out more than necessary, and the advantage that the energy used for the bacteria countermeasure operation is not consumed more than necessary is obtained.

  Still another characteristic configuration of the fuel cell system according to the present invention is that the control device has the smallest decrease in the driving merit during the execution target period of the next antimicrobial operation in the timing determination process. When there are a plurality of timings that can be considered, the later timing is set as the start timing of the next antimicrobial operation.

If the execution interval of the bacteria countermeasure operation is increased, the total number of executions of the bacteria countermeasure operation is reduced, and the total energy used for the bacteria countermeasure operation is also reduced. Therefore, if the target period for the next antimicrobial operation is determined, if the antimicrobial operation is performed at the end of the target period, the interval between the antimicrobial operations will be increased, as described above. It is preferable in that the total energy used for the bacteria countermeasure operation is also reduced.
Therefore, in the present feature configuration, the control device, in the timing determination process, when there are a plurality of timings when the planned output value of the fuel cell power generator satisfies the countermeasure operation enablement period during the target period for the next bacteria countermeasure operation, Therefore, the later timing is set as the start timing of the next antimicrobial operation. Thereby, the implementation interval of bacteria countermeasure driving | operation becomes long and the advantage that the total energy used for bacteria countermeasure driving | operation decreases is acquired.

It is a figure explaining the structure of a fuel cell system. It is a flowchart which shows the procedure when performing the microbe countermeasure driving | operation of a fuel cell power generation device.

The fuel cell system according to the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating the configuration of a fuel cell system.
The fuel cell system includes a fuel cell power generation device G having a fuel cell main body 10 and a fuel reforming unit 7, a water supply device S that supplies reforming water to the fuel cell power generation device G, and a water supply device S that uses reforming water. An impurity removing device R that performs an impurity removing process on water used as a control device and a control device C that controls the operation of each device.

The fuel cell power generator G includes a fuel cell main body 10 and a fuel reforming unit 7.
The fuel reforming unit 7 is a device for reforming raw fuel gas containing hydrocarbons into fuel gas containing hydrogen as a main component. In the present embodiment, the fuel reforming unit 7 includes a reformer 8 that performs steam reforming of the raw fuel gas, and a combustor 9 that generates heat supplied to the reforming reaction in the reformer 8. . The raw fuel gas is supplied to the reformer 8 of the fuel reforming unit 7 through the raw fuel gas supply path 3. The raw fuel gas supply path 3 is provided with a gas on-off valve 1 and a raw fuel pump 2 to adjust the flow rate of the raw fuel supplied to the fuel reforming unit 7. A raw fuel gas branch path 4 is provided downstream of the raw fuel pump 2, an upstream side of the raw fuel gas branch path 4 is connected to the raw fuel gas supply path 3, and a downstream side of the fuel reformer 7 is connected downstream of the raw fuel gas branch path 4. It is connected to the combustor 9. A combustion air supply path 5 is connected to the raw fuel gas branch path 4. Since air (oxygen) is sent from the combustion air blower 6 to the combustion air supply passage 5, a mixed gas of raw fuel gas and air is supplied to the combustor 9, and as a result, combustion occurs. In the vessel 9, the mixed gas is burned. Then, the combustion heat generated in the combustor 9 is transmitted to the reformer 8. Further, exhaust fuel gas (a gas containing hydrogen gas that has not been used at the anode) discharged from the anode of the fuel cell main body 10 to be described later is supplied to the combustor 9 of the fuel reforming unit 7 through the exhaust fuel gas supply path 20. Then, the exhaust fuel gas can be burned in the combustor 9.

  When the fuel cell main body 10 is constituted by, for example, a solid polymer fuel cell, the illustration is omitted, but the fuel cell main body 10 has a plurality of cells constituted by sandwiching a solid polymer electrolyte membrane between an anode and a cathode. Prepare. The anode is connected to the reformer 8 via the fuel gas supply path 19, and the cathode is connected to the cathode air supply path 24. A cathode air blower 25 is provided in the cathode air supply path 24. With such a configuration, the fuel gas mainly composed of hydrogen generated by steam reforming in the reformer 8 is supplied to the anode of the fuel cell main body 10 through the fuel gas supply path 19, and the cathode air It is supplied to the cathode of the fuel cell body 10 through the supply path 24. Then, power generation is performed by oxidation and reduction of fuel gas and air (oxygen) as an oxidizing material.

  In the present embodiment, the fuel cell system includes a water supply device S for supplying reforming water used for steam reforming of the raw fuel gas to the reformer 8 of the fuel reforming unit 7. The water supply device S includes a water tank 21, a reforming water supply path 22, and a reforming water pump 23. In addition, the fuel cell system includes an impurity removing device R that performs an impurity removing process on water stored in the water tank 21, that is, water used as water for reforming by the water supply device S.

  In the water supply device S, one end side of the reforming water supply path 22 is connected to the water tank 21, and the other end side is connected to the reformer 8. Accordingly, when the reforming water pump 23 operates, the water in the water tank 21 is supplied to the reformer 8 through the reforming water supply path 22, and the water vapor is generated by vaporizing the water in the reformer 8. Thus, the raw fuel gas supplied through the raw fuel gas supply path 3 is steam reformed, and the fuel gas mainly composed of steam reformed hydrogen is supplied to the anode of the fuel cell main body 10 as described above.

The impurity removing device R is configured so that water stored in the water tank 21 circulates, an impurity removing unit 30 provided in the middle of the water treating channel 29, and water flows through the impurity removing unit 30. A treated water pump 31 for flowing water to the water treatment path 29 is provided. The impurity removing unit 30 includes, for example, an ion exchange resin that can remove ions as impurities dissolved in the treated water. Or you may further provide the adsorbent etc. which can adsorb | suck the organic substance etc. as an impurity which exists in treated water. The ion exchange resin exchanges electrolyte ions dissolved in the treated water (for example, salts and ammonia dissolved by ionization) with, for example, H ⁺ and OH ⁻ , so that the electrolyte contained in the treated water It functions to make the concentration relatively low (ie, lower the electrical conductivity). The adsorbent is composed of, for example, activated carbon, and has a function of adsorbing an adsorbent such as an organic substance (for example, siloxane, nonpolar or polar organic molecule, microorganism or microbial secretion, oil, etc.) contained in the treated water. Demonstrate.
With such a configuration, when the treated water pump 31 operates, the water in the water tank 21 flows through the water treatment path 29, is treated by the impurity removal unit 30, and then returns to the water tank 21.

  The fuel cell main body 10 also includes a cooling unit (not shown) that cools the fuel cell by recovering heat generated during power generation. Specifically, cooling water that circulates in a cooling water circulation path 16 to be described later is supplied to the cooling unit, and the fuel cell main body 10 is cooled. The cooling water that has recovered the exhaust heat from the fuel cell power generator G in this way flows into a heat exchanger 18 provided in the middle of the cooling water circulation path 16. In this heat exchanger 18, the cooling water exchanges heat with the hot water circulating in the hot water storage circuit 26 and passes the exhaust heat recovered from the fuel cell power generator G to the hot water. The hot water flowing through the hot water storage circuit 26 is stored in a hot water storage tank 27 where heat is stored.

  The hot water stored in the hot water storage tank 27 is supplied to the heat demand section 35 through the hot water supply path 33. Specifically, the fuel cell system includes a hot water supply path 33 through which hot water stored in the hot water storage tank 27 circulates between the hot water storage tank 27 and the heat demand unit 35. The flow rate of warm water in the warm water supply path 33 is adjusted by a warm water pump 34. When the heat demand unit 35 is a floor heating device or an air conditioner that uses only the heat of hot water, the hot water after the heat is used in the heat demand unit 35 returns to the hot water storage tank 27 through the hot water circulation path. Alternatively, when the heat demand unit 35 is a hot water supply device using hot water itself, the hot water does not return to the hot water storage tank 27.

  The power generated by the fuel cell main body 10 of the fuel cell power generation apparatus G is output to the power line 14 via the inverter 11 and is consumed by the power demand unit 13 connected to the power line 14. In the present embodiment, the commercial power system 12 is also connected to the power line 14. That is, the power demand unit 13 is configured to be able to receive power from at least one of the fuel cell power generator G and the commercial power system 12.

  Furthermore, the fuel cell system according to the present embodiment includes a water temperature adjusting device A that adjusts the temperature of water to be subjected to impurity removal processing by the impurity removing device R using heat output from the fuel cell power generator G. Here, the water to be subjected to the impurity removal process is water that flows from the water tank 21 to the water treatment path 29 and flows along the path leading to the impurity removal unit 30. In the present embodiment, the water temperature adjusting device A can be realized by using the functions of the cooling water pump 17, the heat exchanger 18, the water tank 21, the circulation pump 28, the treated water pump 31, and the like.

For example, when the control device C controls the operation of the circulation pump 28 to reduce the flow rate of hot water flowing through the hot water storage circuit 26, the amount of heat that the hot water receives from the cooling water flowing through the cooling water circuit 16 in the heat exchanger 18 is increased. Less. And the temperature of the cooling water which flows into the water tank 21 from the heat exchanger 18 through the cooling water circulation path 16 becomes relatively high. As a result, the temperature of the water flowing from the water tank 21 into the water treatment path 29 is also relatively high.
When the control device C controls the operation of the cooling water pump 17 to increase the flow rate of the cooling water flowing through the cooling water circulation path 16, the amount of heat taken away by the hot water flowing through the hot water storage circulation path 26 in the heat exchanger 18. Less. And the temperature of the cooling water which flows into the water tank 21 from the heat exchanger 18 through the cooling water circulation path 16 becomes relatively high. As a result, the temperature of the water flowing from the water tank 21 into the water treatment path 29 is also relatively high.
When the control device C controls the operation of the treated water pump 31 to increase the flow rate of treated water flowing through the water treatment path 29, that is, when the treated water flowing into the impurity removing unit 30 increases, the impurity removing unit 30 More heat is received. And the temperature of the impurity removal part 30 becomes relatively high. As a result, the temperature of the treated water flowing through the water treatment path 29 also becomes relatively high.

  As described above, in the present embodiment, the fuel cell system has the cooling water circulation path 16 that circulates the cooling water in the fuel cell power generation apparatus G, and the fuel cell power generation apparatus using the cooling water flowing through the cooling water circulation path 16. A cooling means for recovering heat output from G is provided. That is, the cooling means referred to here is configured using the cooling water circulation path 16, the cooling water pump 17, the heat exchanger 18, the water tank 21, and the like. Then, the water temperature adjusting device A obtains a part of the exhaust heat recovered from the fuel cell power generator G by the cooling means from the cooling water flowing through the cooling water circulation path 16, and removes impurities using a part of the exhaust heat. Adjust the temperature of the water to be treated. In the present embodiment, the water temperature adjusting device A obtains a part of the exhaust heat from the water tank 21 that constitutes a part of the cooling water circuit 16.

  Further, the fuel cell system acquires the exhaust heat recovered from the fuel cell power generator G by the cooling means by exchanging heat with the coolant flowing through the coolant circulation path 16, and stores the exhaust heat in the heat storage device (hot water storage tank 27). A recovery device is provided. That is, the exhaust heat recovery apparatus referred to here is configured using the heat exchanger 18, the hot water storage circuit 26, the hot water storage tank 27, the circulation pump 28, and the like. And in the middle of the cooling water circulation path 16, a heat acquisition part (part where the water tank 21 is provided) from which the above-described water temperature adjustment apparatus A acquires a part of the exhaust heat recovered from the fuel cell power generation apparatus G, A heat recovery part (part where the heat exchanger 18 is provided) from which the above-described exhaust heat recovery apparatus acquires the exhaust heat recovered from the fuel cell power generator G is provided, and the heat acquisition part (water tank 21) is It is on the downstream side of the heat recovery site (heat exchanger 18).

Next, operation control of the fuel cell power generator G by the controller C will be described.
The control device C derives a time-series predicted value of power demand in the power demand unit 13 with reference to time-series power demand data in the past power demand unit 13. For example, the power measurement unit 15 provided in the power line 14 measures actual power demand data in the power demand unit 13 and stores the data in the storage device M. And the control apparatus C refers to the time-sequential power demand data in the past power demand part 13 memorize | stored in the memory | storage device M, and the time-sequential predicted value of the power demand in the power demand part 13 Is derived.

  Further, the control device C derives a time-series predicted value of power demand in the heat demand unit 35 with reference to time-series heat demand data in the past heat demand unit 35. For example, a flow rate sensor 36 for detecting the flow rate of hot water flowing into the heat demanding part 35 and a temperature sensor 37 for detecting temperature are provided in the hot water supply path 33 upstream of the heat demanding part 35. A temperature sensor 38 that detects the flow rate of the hot water flowing out is provided in the hot water supply path 33 on the downstream side of the heat demand section 35. Then, the detection results of the flow sensor 36, the temperature sensor 37, and the temperature sensor 38 are stored in the storage device M. As a result, the control device C can derive the amount of heat consumed by the heat demand unit 35 from the flow rate of the hot water flowing into the heat demand unit 35 and the temperature before and after flowing through the heat demand unit 35, and is stored in the storage device M. The amount of heat can be stored. In this way, the control device C refers to the time-series heat demand data in the past heat demand section 35 stored in the storage device M, and the time series of the heat demand in the heat demand section 35. Deduced predictive value.

Based on the time-series predicted value of power demand in the power demand unit 13 and the time-series predicted value of heat demand in the heat demand unit 35, the control device C sends the power demand unit 13 to the power demand unit 13. The operation plan process for deriving a time-series output plan value of the fuel cell power generator G for supplying power to the heat demanding unit 35 and supplying heat to the heat demanding unit 35 is performed. For example, the control device C derives a time-series planned value of the power generation output of the fuel cell power generation device G every hour up to 24 hours at a set timing such as midnight, and stores the planned value. Store in device M. In this operation planning process, when the control device C operates the fuel cell power generation device G, purchases power from the commercial power system 12, and receives heat supply from another auxiliary heat source machine (not shown). Occurring when the time-series forecast value of power demand and the time-series forecast value of heat demand are covered in consideration of the primary energy consumption, cost, and environmental load (for example, CO ₂ emissions) A time-series output plan value of the fuel cell power generator G is derived so that at least one of the primary energy consumption, cost, and environmental load (for example, CO ₂ emission amount) is minimized.

Further, the control device C can also derive an operation merit obtained when the fuel cell power generation device G is operated with the output plan value derived in the operation plan process. Here, the operation merit is the merit obtained by operating the fuel cell power generator G (for example, merit that the primary energy consumption can be reduced, merit that the cost can be reduced, environmental load (CO ₂ emission amount, etc.) ) And so on. That is, primary energy when all of the power demand in the power demand section 13 and the heat demand in the heat demand section 35 are covered by power purchased from the external commercial power system 12 and heat supplied from other auxiliary heat source machines. Consumption, cost, and environmental load are different from primary energy consumption, cost, and environmental load when at least a part of power demand and heat demand is covered by the output of the fuel cell power generator G. The apparatus C derives the operation merit by comparing them. It should be noted that what value is regarded as the driving merit and how the driving merit is derived can be appropriately set.

Next, bacteria countermeasure operation will be described.
In the present embodiment, when the control device C reaches the start timing of the antibacterial countermeasure operation determined in advance, the temperature of the water to be subjected to the impurity removal process is equal to or higher than the high temperature side reference temperature during the reference period (for example, 1 hour). The anti-bacterial operation for operating the water temperature control device A so as to be maintained (for example, 40 ° C. or higher) is performed. As described above, the water temperature adjusting device A can be realized by using the functions of the cooling water pump 17, the heat exchanger 18, the water tank 21, the circulation pump 28, the treated water pump 31, and the like. Specifically, the control device C can adjust the temperature of the water to be subjected to the impurity removal process by controlling the operation of at least one of the cooling water pump 17, the circulation pump 28, and the treated water pump 31. In the present embodiment, a temperature sensor 32 is provided at a location where the temperature of the treated water before flowing into the impurity removing unit 30 after flowing out of the water tank 21 in the middle of the water treatment path 29 can be measured. By monitoring the 32 detection results, the control device C can know the temperature of the water to be subjected to the impurity removal process.

The interval between the bacteria countermeasure operation will be described. In order to suppress the growth of bacteria in the impurity removing device R, it is necessary to perform the bacteria countermeasure operation at least periodically. However, if the bacteria countermeasure operation is performed more frequently than necessary, the energy used for the bacteria countermeasure operation is consumed more than necessary. Therefore, once the anti-bacterial operation is performed, the control device C should wait for the next anti-bacterial operation, and how long should it be until the next anti-bacterial operation. In order to prescribe the above, the implementation period for the next antimicrobial operation is defined. For example, the control device C performs a period after a predetermined time has elapsed after the bacteria countermeasure operation is completed (for example, a period after 13 hours to 26 hours after the bacteria countermeasure operation is completed) for the next bacteria countermeasure operation. Is set as the implementation target period, and the next anti-bacteria operation is performed during that period. Thereby, the propagation of bacteria in the impurity removing device R can be suppressed, and frequent implementation of bacteria countermeasure operation can be avoided.

In addition, there is a timing when the bacteria countermeasure operation cannot be performed even within the implementation target period of the bacteria countermeasure operation.
Specifically, in the present embodiment, the water temperature adjustment device A is configured to adjust the temperature of the water that is the target of the impurity removal process by the impurity removal device R using the heat output from the fuel cell power generation device G. Has been. Therefore, when the amount of heat output from the fuel cell power generation device G is small, that is, when the power generation output of the fuel cell power generation device G is small, the temperature of the water to be subjected to the impurity removal treatment can be maintained above the high temperature side reference temperature. Can not. For example, if the power generation output of the fuel cell power generation device G is less than 350 W, the control device C determines that the temperature of the water to be subjected to the impurity removal process cannot be maintained above the high temperature side reference temperature.
In addition, the water temperature adjusting device A uses cooling water (cooling water stored in the water tank 21) for cooling the fuel cell main body 10. Therefore, when the antimicrobial operation is performed when the amount of heat output from the fuel cell power generation device G is large, that is, when the power generation output of the fuel cell power generation device G is large, the temperature of the cooling water becomes too high at the same time, and the fuel cell main body 10 May not be sufficiently cooled. For example, if the power generation output of the fuel cell power generation device G is greater than 500 W, the control device C determines that the temperature of the cooling water becomes too high and the fuel cell main body 10 cannot be sufficiently cooled.

  From the above, the control device C must be at a timing at which the output value of the fuel cell power generation device G satisfies a predetermined countermeasure operation enabling condition (for example, the power generation output of the fuel cell power generation device G is 350 W or more and 500 W or less). If this is the case, it is said that the bacteria countermeasure operation cannot be performed.

  Note that, even if the control device C controls the operation of the above-described water temperature control device A to perform the bacteria countermeasure operation, the bacteria countermeasure operation may be substantially performed. That is, the control device C constantly monitors the detection result of the temperature sensor 32, and the temperature of the water to be subjected to the impurity removal process is higher than the high temperature side reference temperature (for example, 40 hours) during the reference period (for example, 1 hour). If it is maintained at (° C. or higher), it is determined that the antimicrobial operation has been completed. Alternatively, the control device C constantly monitors the detection result of the temperature sensor 32, and the temperature of the water to be subjected to the impurity removal process is lower than the low temperature side reference temperature lower than the high temperature side reference temperature during the reference period (for example, If it is maintained at 25 ° C. or lower), it is determined that the bacteria countermeasure operation has been completed.

  In addition, the control device C performs the anti-bacterial operation and performs a timing determination process for determining the start timing of the next anti-bacterial operation during the execution target period of the next anti-bacterial operation. Specifically, in this timing determination process, the control device C obtains a predetermined output plan value of the fuel cell power generator G during the execution target period of the next anti-bacterial operation derived by the operation plan process. The degree of decrease in driving merit predicted when the countermeasure operation enabling condition is changed is derived, and the timing at which the degree of decrease in driving merit is considered to be the smallest is determined as the start timing of the next bacteria countermeasure driving.

If it demonstrates with reference to Table 1, when the output plan value of the fuel cell power generation apparatus G derived | led-out by the said operation plan process is less than 350W, the control apparatus C is the nearest which can satisfy | fill the said countermeasure driving | operation possible condition. The value (that is, 350 W) is set as the output planned value after the change accompanying the bacteria countermeasure operation. For example, in the case of time 18 in Table 1, the output planned value of the fuel cell power generation apparatus G derived by the operation planning process is 250 W, and therefore, the closest value that can satisfy the countermeasure operation enabling condition: 350 W It is the output plan value after the change due to fungus countermeasure operation. In this case, the change width of the output plan value is + 100W.
Further, when the output planned value of the fuel cell power generation device G derived by the operation planning process is greater than 500 W, the control device C obtains the closest value (that is, 500 W) that can satisfy the countermeasure operation enabling condition, It is the output plan value after the change due to fungus countermeasure operation. For example, at time 13 in Table 1, since the output planned value of the fuel cell power generator G derived by the operation planning process is 600 W, the closest value that can satisfy the countermeasure operation enabling condition: 500 W, It is the output plan value after the change due to fungus countermeasure operation. In this case, the output plan value change width is −100 W.
Furthermore, when the output planned value of the fuel cell power generation device G derived by the operation planning process is 350 W or more and 500 W or less, the control device C already satisfies the countermeasure operation enabling condition. The value as it is is set as the output planned value after the change due to the bacteria countermeasure operation. In the case of time 21 in Table 1, since the output planned value of the fuel cell power generator G derived by the operation planning process is 350 W, the output planned value already satisfies the countermeasure operation enabling condition, and remains as it is. Is the planned output value after the change due to antimicrobial operation. In this case, the change width of the planned output value is ± 0 W.
And the control apparatus C derives the said driving | operation merit regarding the output plan value after the change accompanying microbe countermeasure driving | operation.

  For example, as shown in Table 1, if the bacteria countermeasure operation is completed at time 0, the control device C sets the period after 13 hours to 26 hours as the execution target period of the next bacteria countermeasure operation. Then, the control device C derives (A) the operation merit at the initial output plan value and (B) the operation merit at the output plan value after the change due to the bacteria countermeasure operation, and “(A) − ( B) ”is derived as the degree of decrease in driving merit. In Table 1, at each time, the value of “(A) Operation merit at the initial output planned value” is converted to the reference value: 1, and “(B) Output planned value after change due to bacteria countermeasure operation is changed. The value of “operating merit” is expressed as a ratio to the value of “(A) driving merit at the initial output planned value”. Then, as the timing determination process, the control device C follows the start timing of the next anti-bacterial operation, the timing at which the degree of decrease in driving merit (the value of “(A) − (B)” in Table 1) is the smallest. Decide on the start timing of anti-bacteria operation.

  In the case shown in Table 1, at time 21, time 22, time 23, and time 24, the degree of decrease in driving merit (value of “(A)-(B)” in Table 1) is the minimum “0”. Further, in the timing determination process, when there are a plurality of timings at which the degree of reduction in driving merit is considered to be the smallest during the execution target period of the next germ countermeasure driving, Set to the start timing of anti-bacteria operation. Therefore, in the example of Table 1, since the time 21, the time 22, the time 23, and the time 24 are the same timing that it can be considered that the degree of decrease in driving merit is the smallest, the control device C sets the timing of the time 24. Set to the start timing of the next antimicrobial operation.

  In addition, in the case shown in Table 1, since the initial output planned value of the fuel cell power generator G is 350 W or more and 500 W or less at the timing of time 24, the output plan value after the change accompanying the germ countermeasure operation is used as it is. Value. That is, the control device C can perform the timing determination process without redoing the operation plan process of the fuel cell power generator G.

  Next, the procedure when the control device C performs the bacteria countermeasure operation of the fuel cell power generation device G will be described. FIG. 2 is a flowchart showing a procedure when the control device C performs the anti-bacterial operation of the fuel cell power generator G. When the operation of the fuel cell power generator G is started, the control device C starts the flowchart shown in FIG.

  In step # 10, the control device C determines whether or not the completion condition for the bacteria countermeasure operation is satisfied. The control device C constantly monitors the detection result of the temperature sensor 32 regardless of whether or not the bacteria countermeasure operation is being performed, and the temperature of the water to be subjected to the impurity removal process is the high-temperature side reference during the reference period. If the temperature is maintained above the temperature, or if the temperature of the water to be subjected to the impurity removal process is maintained below the low temperature side reference temperature lower than the high temperature side reference temperature during the reference period, It is determined that the operation is complete. In other words, when the completion condition is satisfied by the control device C performing the bacteria countermeasure operation, or when the control device C does not perform the bacteria countermeasure operation, the completion condition of the bacteria countermeasure operation is substantially satisfied. There can be either of the cases when satisfied. Then, if the control device C determines that the condition for completion of the bacteria countermeasure operation is satisfied, the control device C proceeds to step # 12, and if it determines that it is not satisfied, the control device C proceeds to step # 22.

  In Step # 12, the control device C determines whether or not the bacteria countermeasure operation is being performed. And control apparatus C will transfer to process # 14, and will carry out process antimicrobial operation, and will transfer to process # 16 after that when microbe countermeasure operation is underway. Further, the control device C proceeds to step # 16 when the bacteria countermeasure operation is not being performed (that is, although the bacteria countermeasure operation is not performed but the bacteria countermeasure operation is substantially completed).

  In step # 16, the control device C resets the time counter. As described above, the control device C manages the execution interval of the bacteria countermeasure operation, and for that purpose, counts the elapsed time since the previous bacteria countermeasure operation was completed. Therefore, the control device C resets the count of the elapsed time at the timing when the bacteria countermeasure operation is completed this time (that is, “elapsed time = 0”).

  Next, in step # 18, the control device C performs a timing determination process for determining the start timing of the next bacteria countermeasure operation. Specifically, as described with reference to Table 1 above, the control device C derives the fuel cell power generation device G during the execution target period of the next antimicrobial operation derived from the operation planning process. Deriving the expected degree of decrease in driving merit when the output plan value is changed so as to satisfy the predetermined countermeasure driving enablement condition, and the timing at which the degree of decrease in driving merit is considered to be the smallest is Decide on the start timing.

Here, when the output plan value of the fuel cell power generator G is changed to satisfy a predetermined countermeasure operation enabling condition in order to derive the degree of decrease in the operation merit of the fuel cell power generator G in the timing determination process, the change The width is either “± 0 W” as described above, or a width other than “± 0 W”. Then, when the timing when the change width is “± 0 W” is determined as the start timing of the next antimicrobial operation, the output plan value of the fuel cell power generator G is the initial output plan value derived by the operation plan process. You can leave it. On the other hand, when the timing at which the change width is other than “± 0 W” is determined as the start timing of the next bacteria countermeasure operation, it is necessary to actually change the output planned value of the fuel cell power generator G.
That is, when the control device C determines a timing at which the change width of the output plan value of the fuel cell power generation device G is other than “± 0 W” as the start timing of the next anti-bacterial operation in the timing determination process, The operation plan process of actually changing the output plan value of the fuel cell power generator G is performed.

  When this timing determination process is completed and the start timing of the next anti-bacterial operation is determined, the control device C then proceeds to step # 20 and waits for a predetermined time (denoted as “X minutes” in FIG. 2). Return to the beginning of this flowchart.

Further, when the control device C determines in step # 10 that the conditions for completing the bacteria countermeasure operation are not satisfied, the control device C proceeds to step # 22 and determines whether or not the bacteria countermeasure operation is being performed. Then, when the bacteria countermeasure operation is being performed, the control device C proceeds to step # 24 and waits for a predetermined time (indicated as “X minutes” in FIG. 2), and then returns to the beginning of this flowchart. That is, although the water temperature control apparatus A is operated and the bacteria countermeasure operation is being carried out, the bacteria countermeasure operation has not yet been completed (“the temperature of the water to be subjected to the impurity removal process is high during the reference period. This is a state in which it is in a standby state.
On the other hand, when it determines with the control apparatus C having implemented the microbe countermeasure driving | operation in process # 22, it transfers to process # 26 and determines whether it is the implementation timing of microbe countermeasure driving | operation. . That is, the control device C confirms the count of elapsed time, and determines whether or not the start timing of the next bacteria countermeasure operation has been reached.

And if control apparatus C determines with it being the start timing of the following microbe countermeasure driving | operation at process # 26, it will transfer to process # 28 and will start microbe countermeasure driving | operation.
On the other hand, if the control device C determines in step # 26 that it is not the start timing of the next anti-bacterial operation, the process proceeds to step # 30 and waits for a predetermined time (denoted as “X minutes” in FIG. 2). Return to the beginning of this flowchart.

In addition, the control apparatus C may also perform the said driving | operation plan process, when performing the said timing determination process.
In the above-described example, the start timing of the anti-bacterial operation determined in the timing determination process is such that the planned output value of the fuel cell power generator G derived by the operation plan process performed in advance satisfies the above-described countermeasure operation enable condition. It was the timing I had. For example, since the output plan value of the fuel cell power generation device G derived by the operation plan process performed in advance has already satisfied the above countermeasure operation enabling condition (350 W or more and 500 W or less), the value as it is is associated with the bacteria countermeasure operation. This was the case where the output planned value after the change was made (that is, the change range of the output planned value was ± 0 W).
However, when the control device C determines the start timing of the anti-bacterial operation in the timing determination process, the output plan value of the fuel cell power generation device G may have to be changed.

  For example, when the timing at which the output plan value of the fuel cell power generator G derived by the operation plan process performed in advance is 250 W is determined as the start timing of the anti-bacterial operation, the output plan value is the above-described countermeasure operation enable condition. Therefore, the output planned value of the fuel cell power generator G at that timing is a value that satisfies the above-described countermeasure operation possible condition: 350 W (that is, the above-described output planned value after the change accompanying the "(B) bacteria countermeasure operation") It is necessary to change to the output plan value after change due to the anti-bacterial operation used for derivation of the "operating merit". That is, the control device C performs the timing determination process and also executes the operation plan process for changing and determining the output plan value of the fuel cell power generation apparatus G. That is, in this case, the control device C also performs the operation plan process in the timing determination process performed in step # 18 shown in FIG.

  As described above, the control device C satisfies the predetermined countermeasure operation possible condition for the output planned value of the fuel cell power generator G during the execution target period of the next bacteria countermeasure operation derived by the operation planning process. A timing determination process is performed in which the degree of reduction in driving merit predicted when the change is made in this way is derived, and the timing at which the degree of reduction in driving merit is considered to be the smallest is determined as the start timing of the next antimicrobial operation. That is, the control device C has a temporal condition of “being within the target period of the next fungus countermeasure operation” and “the output planned value of the fuel cell power generator G is set so as to satisfy a predetermined countermeasure operation condition. Based on the condition relating to the operating state of the fuel cell power generation apparatus G that the degree of decrease in the operating merit predicted when the change is made to the smallest is determined in advance, When the timing comes, anti-bacteria operation will be implemented. As a result, the propagation of bacteria can be prevented by taking into account the temporal condition of “being in the target period for the next bacteria countermeasure operation”. Further, the present invention relates to the operating state of the fuel cell power generator G that “the degree of decrease in the driving merit predicted when the planned output value of the fuel cell power generator G is changed to satisfy the predetermined countermeasure operating condition” is the smallest. By taking the conditions into consideration, the problem that the anti-bacterial operation is performed at an unfavorable timing in view of the operating state of the fuel cell power generation device G (that is, an unfavorable timing at which the operation merit is greatly reduced) is generated. Can be avoided. Therefore, it is possible to provide a fuel cell system capable of preventing germs from being propagated and capable of carrying out germ countermeasure operation at a timing at which a significant decrease in the operation merit of the fuel cell power generator G can be avoided.

<Another embodiment>
<1>
In the above-described embodiment, there are cases where the planned output value of the fuel cell power generation apparatus G during the execution target period of the next anti-bacterial operation is sequentially updated or undecided. Further, as described in the above embodiment, although the control device C does not perform the bacteria countermeasure operation, it may be considered that the bacteria countermeasure operation is substantially completed. The contents of the timing determination process in these cases will be described below with specific examples.

[Example 1]
The control device C performs the operation plan process as needed to change the output plan value of the fuel cell power generator G once determined. For example, as shown in Table 2, the planned output value of the fuel cell power generator G after time 20 is updated when time 19 ends between time 13 and time 26, which is the implementation target period.

  In the case shown in Table 2, the output planned value of the fuel cell power generator G at time 24 is changed to 550 W, and at the same time, the degree of decrease in driving merit at time 24 (“(A)-(B)” in Table 1). Is changed to “0.14”. Therefore, in the case shown in Table 2, at time 21, time 22, and time 23, the degree of decrease in driving merit (value of “(A)-(B)” in Table 1) is the minimum “0”. The device C sets the timing of time 23, which is the latest timing, as the start timing of the next germ countermeasure operation. That is, the control device C is not performing the anti-bacterial operation separately from the timing determination process performed in the process # 18 illustrated in FIG. 2 (for example, the process proceeds from the process # 22 to the process # 26 in FIG. 2). Timing) is also performed. Then, when determining whether or not it is the execution timing of the anti-bacterial operation in step # 26 of FIG. 2, the control device C determines the time 23 (that is, determined by a new timing determination process) based on the elapsed time count. It is determined whether or not the antibacterial countermeasure operation start timing) has been reached.

[Example 2]
As another example, when the control device C performs the timing determination process, there may be a case where the planned output value of the fuel cell power generation device G during the execution target period of the next bacteria countermeasure operation is not yet determined. Table 3 shows an example in which the output plan value is determined by the operation plan process until time 17, but the output plan value is not yet determined after time 18. However, although the output plan value has not yet been determined after time 18, the control device C determines the degree of decrease in driving merit (value of “(A) − (B)”) as “0”. Therefore, in the case shown in Table 3, since the degree of decrease in driving merit (value of “(A) − (B)”) is “0” which is the minimum from time 18 to time 26, the control device C The timing of time 26, which is the latest timing, is set as the start timing of the next antimicrobial operation.

  As described in [Example 1] above, when the control device C sequentially performs the operation plan process, the initially planned output value of the fuel cell power generation device G, which has not been determined, is newly determined. The timing determination process described above is performed based on the planned output value. That is, when output plan values after time 18 that have not been determined in Table 3 are newly determined, and output plan values from time 13 to time 26 as shown in Tables 1 and 2 are determined, those plan values are determined. The start timing of the next antimicrobial operation is determined based on the planned output value. Also in this case, the control device C is not performing the anti-bacterial operation separately from the timing determination process performed in the process # 18 shown in FIG. 2 (for example, the process shifts from the process # 22 to the process # 26 in FIG. 2). The timing determination process is also performed.

[Example 3]
Although Table 4 does not mean that the control device C has performed the anti-bacterial operation, an example in which the anti-bacterial operation has been substantially completed will be described. That is, the control device C constantly monitors the detection result of the temperature sensor 32 regardless of whether or not the bacteria countermeasure operation is being performed. As a result, at time 22, the temperature of the water to be subjected to the impurity removal process is During the reference period, it is determined that the temperature is maintained at a temperature higher than the high temperature side reference temperature, or the temperature of water to be subjected to the impurity removal treatment is lower than the low temperature side reference temperature lower than the high temperature side reference temperature during the reference period. It determines with having been maintained, and determines that microbe countermeasure driving | operation was completed (in step # 10 of FIG. 2, "Yes"). And the control apparatus C resets the count of the elapsed time at the timing when the microbe countermeasure driving | operation was completed (process # 16 of FIG. 2), and performs the timing determination process for determining the start timing of the following microbe countermeasure driving | operation. (Step # 18 in FIG. 2). In the example shown in Table 4, the control device C sets the period between time 35 and time 48 corresponding to 13 hours to 26 hours after the completion of the bacteria countermeasure operation at time 22 as the implementation target period. Then, as in the case of [Example 2], the control device C has the minimum degree of decrease in driving merit (value of “(A) − (B)”) at time 42 to time 48 in the case shown in Table 4. Therefore, the control device C sets the timing of the time 48, which is the latest timing, as the start timing of the next antimicrobial operation.

<2>
In the above embodiment, the configuration of the fuel cell system has been described with a specific example, but the configuration can be changed as appropriate.
For example, the water flowing into the water tank 21 from the cooling water circulation path 16 (that is, the water holding the heat output from the fuel cell power generator G) is divided into, for example, two systems of water inside the water tank 21. You may let them. Then, water from one system is supplied as cooling water to the fuel cell main body 10 via the cooling water circulation path 16, and water from the other system is supplied to the impurity removing process in the impurity removing device R and used as reforming water. You may comprise so that it may be supplied to the fuel reforming part 7. FIG. Thus, the flow mode of various water (heat medium) such as the above-described cooling water and reforming water can be changed as appropriate.
Further, the water temperature control device A uses not only the heat output from the fuel cell power generation device G but also the power output from the fuel cell power generation device G to control the temperature of the water to be subjected to the impurity removal processing by the impurity removal device R. It may be configured to adjust. For example, the control device C directly or indirectly sets the temperature of the water to be subjected to the impurity removal processing by the impurity removal device R by an electric heater that consumes the electric power output from the fuel cell power generation device G and generates Joule heat. You may adjust it.

<3>
In the above embodiment, several numerical values have been exemplified for explaining the present invention, but these numerical values can be appropriately changed. For example, when explaining the numerical value of “after 13 hours to 26 hours” illustrated for the execution target period of the next bacteria countermeasure operation after the bacteria countermeasure operation is completed, or whether the bacteria countermeasure operation is completed. Measured operation is possible for the reference period (1 hour), the high temperature side reference temperature (40 ° C), the low temperature side reference temperature (25 ° C), the output value of the fuel cell power generator G when performing antimicrobial operation The numerical values for the conditions (350 W to 500 W) can be appropriately changed.
In the above embodiment, when deriving the degree of decrease in driving merit, the value of “(A) driving merit at the initial output planned value” is converted to the reference value: 1 at each time, and “(B) Although the example which shows the value of "the driving merit in the output plan value after the change accompanying the bacteria countermeasure driving" with the value of "(A) the driving merit in the initial output plan value" has been described, Rather than deriving the ratio, the value of “(A) Operation merit at the initial output plan value” and “(B) Operation merit at the output plan value after change due to bacteria countermeasure operation” You may simply compare.

  INDUSTRIAL APPLICABILITY The present invention can be used in a fuel cell system that can prevent germs from growing and that can perform a germ countermeasure operation at a timing that can avoid a significant decrease in the operating merit of the fuel cell power generator.

7 Fuel reforming unit 10 Fuel cell main body 13 Electric power demand unit 16 Cooling water circulation path 17 Cooling water pump (water temperature adjusting device A)
18 Heat exchanger (water temperature control device A)
21 Water tank (water temperature control device A, water supply device S)
22 Water supply path for reforming (water supply device S)
23 Water pump for reforming (Water supply device S)
28 Circulation pump (water temperature control device A)
29 Water treatment path (impurity removal device R)
30 Impurity remover (impurity remover R)
31 Treated water pump (water temperature control device A, impurity removal device R)
35 Heat demand part A Water temperature control device C Control device G Fuel cell power generation device R Impurity removal device S Water supply device

Claims (3)

A fuel cell body that generates power using a fuel gas and an oxidant gas, and a fuel that steam-reforms a raw fuel containing hydrocarbons to generate the fuel gas used in a power generation reaction in the fuel cell body A fuel cell power generator having a reforming unit;
A water supply device for supplying reforming water used for steam reforming performed in the fuel reforming unit to the fuel cell power generation device;
An impurity removal device that performs an impurity removal treatment on water used as the reforming water by the water supply device;
A control device for controlling the operation of each of the devices,
The control device generates power from the fuel cell power generation device to the power demand unit based on a time series forecast value of power demand in the power demand unit and a time series forecast value of heat demand in the heat demand unit. supplying a fuel cell system that performs the operation planning process of deriving the time-series output planned value of the fuel cell power generator for supplying heat to the heat demand unit,
A water temperature adjusting device for adjusting the temperature of water to be subjected to impurity removal processing by the impurity removing device using heat output from the fuel cell power generation device;
The water temperature adjusting device is configured so that the temperature of the water to be subjected to the impurity removal process is maintained at a high temperature side reference temperature or higher during a reference period at a predetermined start timing of the bacteria countermeasure operation. implemented bacteria measures operation for operating and is configured to start timing of the next of said fungal measures operated to implement the timing determination process of determining between the implementation period of the next bacteria countermeasures operation,
In the timing determination process, the control device calculates the output planned value of the fuel cell power generation device during the execution target period of the next germ countermeasure operation, which is derived by the operation plan process, as a predetermined countermeasure operation. A fuel that derives the degree of decrease in driving merit that is predicted when the condition is changed so as to satisfy a possible condition, and determines the timing at which the degree of decrease in driving merit is considered to be the smallest as the start timing of the next antimicrobial operation Battery system. Regardless of whether or not the anti-bacterial operation is being performed, the control device is configured so that the temperature of the water to be subjected to the impurity removal process is equal to or higher than the high temperature side reference temperature or higher than the high temperature side reference temperature during the reference period 2. The fuel cell system according to claim 1, wherein if the temperature is maintained below a lower low temperature side reference temperature, it is determined that the anti-bacterial operation has been completed, and the timing determination process is performed.   In the timing determination process, when there are a plurality of timings at which the degree of decrease in the driving merit is considered to be the smallest during the execution target period of the next germ countermeasure driving, The fuel cell system according to claim 1, wherein the fuel cell system is set at a start timing of the next antimicrobial operation.

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