JP2019053828A - Fuel cell system - Google Patents

Abstract

To provide a fuel cell system arranged so as to cope with a trouble such as the clogging or break caused in an air filter.SOLUTION: A fuel cell system comprises a controller 10. The controller regulates an output of a blower 6 so that an air flow rate per unit time, measured by a flowmeter 7 becomes a target flow rate set according to an output power of a cell stack S during a normal power-generating operation. During an inspecting operation, the controller causes the blower 6 to work with a predetermined output in a state in which at least one valve 8 of valves 8 provided on a plurality of individual air flow paths L3a, L3b, L3c is closed and at least one valve 8 is left opened, and determines whether or not abnormality occurs in an air filter 9 provided on the same air flow path L3a, L3b, L3c as that the valve 8 left opened is provided on, based on an air flow rate per unit time, measured by the flowmeter 7 at that time.SELECTED DRAWING: Figure 1

Description

  The present invention provides a fuel cell unit including a cell stack in which a plurality of cells each having an anode to which fuel gas is supplied and a cathode to which oxygen gas is supplied are stacked, and when air containing oxygen gas is supplied to the fuel cell unit An air line that flows into the fuel cell unit, a blower that flows air into the air line toward the fuel cell unit, a flow meter that measures the flow rate of air supplied to the fuel cell unit through the air line, and a control device The present invention relates to a fuel cell system provided.

  In Patent Document 1, a fuel cell unit (21) including a cell having an anode to which fuel gas is supplied and a cathode to which oxygen gas is supplied, and air when oxygen gas is supplied to the fuel cell unit flows. A fuel cell system comprising an air line (27a, 27b, 27c), a blower (25) for flowing air into the air line toward the fuel cell section, and an air filter (26) provided in the middle of the air line is described. Has been. In this fuel cell system, by providing a plurality of air filter suction ports, air can be sucked from other suction ports even if one suction port is clogged with foreign matter.

  However, in the fuel cell system described in Patent Document 1, if foreign matter adheres to the air filter and becomes clogged, there is a possibility that an appropriate amount of oxygen gas (air) cannot be supplied to the cathode of the fuel cell unit thereafter. Occurs.

There is also prior art related to measures for a filter after a foreign object or the like is clogged.
For example, in the fuel cell system described in Patent Document 2, a movable filter is disposed in the middle of a discharge flow path for discharging fuel exhaust gas discharged from the fuel electrode of the fuel cell to the outside. Then, by operating the movable filter device, water and foreign matter adhering to the filter are quickly scattered by centrifugal force and vibration due to rotation, and an attempt to prevent clogging of the discharge channel due to water freezing and foreign matter clogging Yes.
In addition, the fuel cell system described in Patent Document 3 attempts to remove foreign substances in the reformed water by providing a filter in the middle of the reformed water line through which the reformed water used for the steam reforming of the raw material flows. . In addition, the filter is cleaned by discharging the reformed water backflowed by the backflow means to the discharge line.

JP 2007-299582 A International Publication No. 2011/114787 JP 2015-26540 A

  In the fuel cell systems described in Patent Document 2 and Patent Document 3, a measure for removing the foreign matter from the filter after the foreign matter is clogged, that is, rotating the filter or causing the fluid to flow backward. However, if a mechanism for performing such treatment is provided, there is a problem that the system configuration becomes very complicated. In addition, there are problems that cannot be realized in a system in which the fluid cannot flow backward, or that it cannot be removed depending on the substance collected in the filter.

  Further, the problem that occurs in the filter is not only the clogging of foreign matters such as dust, but also the problem of breakage of the filter. And when a filter is damaged, there exists a possibility that the foreign material which could not be removed with a filter may be supplied to a fuel cell part.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a fuel cell system that can cope with problems such as clogging and breakage that may occur in an air filter.

In order to achieve the above object, the fuel cell system according to the present invention includes a fuel cell unit comprising a cell stack in which a plurality of cells having an anode to which fuel gas is supplied and a cathode to which oxygen gas is supplied are stacked. , An air line that flows when air containing the oxygen gas is supplied to the fuel cell unit, a blower that flows air through the air line toward the fuel cell unit, and the fuel cell unit through the air line A fuel cell system comprising a flow meter for measuring a flow rate of air supplied per unit time and a control device,
On the upstream side or downstream side of the blower, the air line has a plurality of individual air flow paths that merge after the air flows in parallel with each other,
Each of the plurality of individual air flow paths is provided with an air filter and a valve,
The controller is
During normal power generation operation, the output of the blower is adjusted so that the flow rate of air per unit time measured by the flow meter becomes a target flow rate set according to the output power of the cell stack,
During the inspection operation, the blower is operated at a predetermined output with at least one of the valves provided in each of the plurality of individual air flow paths closed and at least one valve opened, Whether or not an abnormality has occurred in the air filter provided in the same individual air flow path as the valve in the open state based on the air flow rate per unit time measured by the flow meter at that time It is in the point of judging.

According to the above characteristic configuration, even if an abnormality occurs in any of the air filters provided in each of the plurality of individual air flow paths, the air filter is provided in the same individual air flow path as the air filter in which the abnormality has occurred. By closing the valve, it is possible to prevent air from flowing through the air filter in which an abnormality has occurred. In addition, if there is no abnormality in the air filter provided in another individual air flow path, by opening the valve provided in the same individual air flow path as the air filter in which the abnormality has not occurred, Air purified by an air filter in which no abnormality has occurred can be supplied to the fuel cell unit.
Therefore, it is possible to provide a fuel cell system that can cope with problems such as clogging and breakage that may occur in the air filter.

  Another characteristic configuration of the fuel cell system according to the present invention is that, when the control device determines that an abnormality has occurred in the air filter in the inspection operation, the air that has been determined to have the abnormality has occurred. The subsequent normal power generation operation is performed with the valve provided in the same individual air flow path as the filter closed.

  According to the above characteristic configuration, the subsequent normal power generation operation is performed in a state where the valve provided in the same individual air flow path as that of the air filter that is determined to be abnormal is closed. As a result, power generation in the fuel cell unit can be performed in a state where an appropriate amount of purified oxygen gas (air) is supplied to the cathode of the fuel cell unit.

  Still another characteristic configuration of the fuel cell system according to the present invention is that the control device opens only one specific valve among the valves provided in each of the plurality of individual air flow paths in the inspection operation. In this state, the blower is operated at a reference output, and at that time, the air flow rate per unit time measured by the flowmeter is within the first set value when the flow rate is higher than the reference flow rate, and when the flow rate is lower, the second flow rate is decreased. If it is within the set value, it is determined that no abnormality has occurred in the air filter provided in the same individual air flow path as the valve in the open state, and the first setting is set to the larger one from the reference flow rate. If it is not within the value and less than the second set value, it is determined that an abnormality has occurred in the air filter.

If the air filter is not excessively clogged with foreign matter and the air filter is not damaged, an appropriate pressure loss will occur in the air filter. When the blower is operated at the reference output with only one of the provided valves opened, the air flow rate per unit time measured by the flow meter is close to the predetermined reference flow rate. Should be.
Therefore, in this feature configuration, if the air flow rate per unit time measured by the flow meter is within the first set value when the flow rate is larger than the reference flow rate and within the second set value when it is less than the reference flow rate, the air flow is opened. It is determined that no abnormality has occurred in the air filter provided in the same individual air flow path as a certain valve. On the other hand, if the air flow rate per unit time measured by the flow meter is not within the first set value when the air flow is higher than the reference flow rate and is not within the second set value when it is less than the second set value, an abnormality occurs in the air filter It is determined that By performing such verification, it is possible to accurately determine whether the air filter is normal or abnormal.

  Further, the control device operates the blower at the reference output with only one specific valve among the valves provided in each of the plurality of individual air flow paths open in the inspection operation, and the flow rate at that time If the air flow rate per unit time measured by the meter is larger than the first set value from the reference flow rate, the air flow rate is large in the air filter provided in the same individual air flow path as the valve in the open state. It can also be determined that a breaking abnormality has occurred, and if the reference flow rate is smaller than the second set value, it can be determined that a clogging abnormality that reduces the air flow rate in the air filter has occurred.

It is a figure which shows the structure of a fuel cell system. It is a flowchart explaining an inspection driving process. It is a graph which shows the relationship between a blower output and an air flow rate.

A fuel cell system according to an embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a fuel cell system. As shown in the figure, the fuel cell system includes a fuel cell unit 4 including a cell stack S in which a plurality of cells C each having an anode 1 to which fuel gas is supplied and a cathode 2 to which oxygen gas is supplied, and oxygen gas. An air line L3 that flows when the contained air is supplied to the fuel cell unit 4, a blower 6 that flows air into the air line L3 toward the fuel cell unit 4, and a fuel cell unit 4 that is supplied through the air line L3. A flow meter 7 for measuring the flow rate of air per unit time and a control device 10 are provided. The power generated by the fuel cell unit 4 can be supplied, for example, to a power load device in a house or a power system via a power conversion unit (not shown) having an inverter or the like. The control device 10 controls the operations of the fuel cell unit 4, the blower 6, and the power conversion unit described above. Further, the measurement result of the flow meter 7 is transmitted to the control device 10.

  The fuel cell unit 4 can be configured using various types of cells C such as a solid oxide cell C and a solid polymer cell C, for example. The fuel gas supplied to the anode 1 of the fuel cell unit 4 is generated by the reforming unit 5. For example, raw fuel gas containing hydrocarbons such as city gas (methane or the like) is supplied to the reforming unit 5 through the raw fuel line L1. An electrolyte part 3 is provided between the anode 1 and the cathode 2. Then, the raw fuel gas is steam reformed in the reforming unit 5 to generate a fuel gas mainly composed of hydrogen, and the fuel gas is supplied to the fuel cell unit 4 through the fuel line L2. The operation of the reforming unit 5 is controlled by the control device 10.

  Although illustration is omitted, various auxiliary machines are provided in the fuel cell system. For example, while operating the fuel cell, a pump used to circulate cooling water that recovers the heat generated in the fuel cell unit 4 or hot water stored in a tank is circulated to generate heat from the cooling water. A pump or the like used for recovery is provided as an auxiliary machine. The operation of these auxiliary machines is controlled by the control device 10.

  The control device 10 can switch the operating state of the fuel cell system to either the interconnected state or the idling state. For example, the interconnected state is a state in which the power generated by the fuel cell unit 4 is supplied to the above-described power load device or power system, and the idling state is the power load device or power that has been generated by the fuel cell unit 4 described above. This is a state in which the above-mentioned auxiliary machine or the like is internally consumed without being supplied to the system or the like. That is, since power is consumed even in an auxiliary machine that operates while the fuel cell unit 4 is in operation, the fuel cell can be used even if the power generated by the fuel cell unit 4 is not supplied to a power load device or a power system. The operation of the fuel cell unit 4 can be continued while consuming the electric power generated by the unit 4 with the auxiliary machine.

  Further, in the fuel cell system of the present embodiment, on the upstream side of the blower 6, the air line L3 has a plurality of individual air flow paths L3a, L3b, and L3c that merge after the air flows in parallel with each other. The plurality of individual air flow paths L3a, L3b, and L3c may be provided on the upstream side of the blower 6. An air filter 9 (9a, 9b, 9c) and a valve 8 (8a, 8b, 8c) are provided in each of the plurality of individual air flow paths L3a, L3b, L3c. Specifically, in the example shown in FIG. 1, the air line L3 includes three individual air flow paths L3a, L3b, and L3c. The individual air flow path L3a is provided with a valve 8a and an air filter 9a, the individual air flow path L3b is provided with a valve 8b and an air filter 9b, and the individual air flow path L3c is provided with a valve 8c and an air filter 9c. Provided. The operation of these valves 8 is controlled by the control device 10. As the air filter 9, for example, a fabric made of fibers is used. For example, an electromagnetic valve or the like is used as the valve 8.

  In the fuel cell system of the present embodiment, the control device 10 can switch between the normal power generation operation and the inspection operation. The normal power generation operation is an operation when the control device 10 sets the operation state of the fuel cell system to the above-described interconnection state or idling state and controls the generated power of the fuel cell unit 4 to a desired value. The inspection operation is an operation when the control device 10 inspects the air filter 9. In this embodiment, the operation state of the fuel cell system is set to the idling state described above.

[Normal power generation operation]
During the normal power generation operation, the control device 10 controls the flow rate of fuel gas per unit time supplied to the anode 1 of the fuel cell unit 4 and the flow rate of oxygen gas supplied per unit time to the cathode 2 of the fuel cell unit 4. Is adjusted to a predetermined target value set according to the output power of the cell stack S. Specifically, the control device 10 sets the raw fuel supplied to the reforming unit 5 to a target value set according to the output power of the cell stack S, and air per unit time measured by the flow meter 7. The output of the blower 6 is adjusted so that the flow rate becomes the target flow rate set according to the output power of the cell stack S. However, the target flow rate includes an oxygen amount (air amount) consumed at the cathode 2 of the fuel cell unit 4 for a power generation reaction, and an oxygen amount (air) for burning anode exhaust gas discharged from the anode 1, for example. In some cases. With such control, during normal power generation operation, fuel gas and oxygen gas in amounts corresponding to the output power of the cell stack S are supplied to the anode 1 and the cathode 2 of the fuel cell unit 4.

[Inspection operation]
Since the air filter 9 is installed for the purpose of catching foreign matter in the air, the foreign matter gradually accumulates on the air filter 9. That is, the air filter 9 may have a clogging abnormality that reduces the air flow rate. In this case, since the pressure loss in the air filter 9 is increased, the air flow rate per unit time measured by the flow meter 7 is set to a target flow rate set according to the output power of the cell stack S. In order to achieve this, the blower output must be increased. Further, a hole may be formed in the cloth-shaped air filter 9. In this case, the air filter 9 may have a breakage abnormality that increases the air flow rate. And the problem that the foreign material in air is not removed but the fuel cell part 4 is supplied may arise.

  Because of such a problem, it is necessary to perform an inspection operation for determining whether or not an abnormality has occurred in the air filter 9 at a predetermined timing. In the present embodiment, the control device 10 closes at least one of the valves 8 provided in each of the plurality of individual air flow paths L3a, L3b, and L3c and performs at least one valve 8 during the inspection operation. The blower 6 is operated at a predetermined output with the valve open, and based on the air flow rate per unit time measured by the flow meter 7 at that time, the same individual air flow path as the valve 8 in the open state It is determined whether or not an abnormality has occurred in the air filter 9 provided in L3a, L3b, and L3c. However, when the blower 6 is operated at a predetermined output during the inspection operation, oxygen (air) necessary for the fuel cell unit 4 needs to be supplied.

FIG. 2 is a flowchart for explaining the inspection operation process.
In step # 10, the control device 10 determines whether it is time to perform the inspection operation. For example, the control device 10 determines that it is time to perform the inspection operation once a day at a predetermined time such as 2 am (determines “Yes” in step # 10). Then, the process proceeds to step # 11. When it is not the timing for performing the inspection operation (when it is determined “No” in Step # 10), the process returns to the beginning of the flowchart of FIG.

In step # 11, the control device 10 sets the operating state of the fuel cell system to an idling state.
Next, the control device 10 operates the blower 6 with the reference output with only one specific valve 8 among the valves 8 provided in each of the plurality of individual air flow paths L3a, L3b, and L3c open. (Step # 12), it is determined whether the amount of air per unit time measured by the flowmeter 7 is appropriate (step # 13). Here, the air filter 9 provided in the same individual air flow path L3a, L3b, L3c as the opened valve 8 is not clogged with excessive foreign matters, and the air filter 9 is also damaged. If not, an appropriate pressure loss occurs in the air filter 9, so that only one specific valve 8 among the valves 8 provided in each of the plurality of individual air flow paths L3a, L3b, L3c is opened. When the blower 6 is operated at the reference output, the air flow rate per unit time measured by the flow meter 7 should be close to a predetermined reference flow rate.

  FIG. 3 is a graph showing the relationship between the blower output and the air flow rate. As shown in the figure, as the blower output increases, the flow rate of air per unit time flowing through the air line L3 by the blower 6 increases. When the blower 6 is operated at a blower output of 60% in FIG. 3, about 33 L / min of air can flow per unit time. However, this flow rate is an operating characteristic of the blower 6 alone, and the air flow rate when it is incorporated in the apparatus as shown in FIG. 1 (that is, when there is a pressure loss in the air filter 9 etc.) is different. Value. Therefore, the control device 10 uses the blower 6 as a reference output in a state where only one specific valve 8 among the valves 8 provided in each of the plurality of individual air flow paths L3a, L3b, and L3c is opened in advance. When the operation is performed, the value (reference flow rate) of the air flow rate per unit time measured by the flow meter 7 is grasped and stored in the storage device 11.

  In the inspection operation, the control device 10 outputs the blower 6 as a reference output in a state in which only one specific valve 8 among the valves 8 provided in each of the plurality of individual air flow paths L3a, L3b, and L3c is opened. If the air flow rate per unit time measured by the flow meter 7 at that time is within the first set value when the flow rate is greater than the reference flow rate and within the second set value when the flow rate is less than the reference flow rate, It is determined that no abnormality has occurred in the air filter 9 provided in the same individual air flow path L3a, L3b, L3c as the valve 8 in the opened state, and within the first set value in a direction larger than the reference flow rate If it is not less than the second set value, it is determined that an abnormality has occurred in the air filter 9 (step # 12 to step # 15). At this time, since it is assumed that the fuel cell unit 4 is supplied with the air at the reference flow rate, the power generation in the cell stack S is also controlled to the power corresponding to the amount of air.

Specifically, the control device 10 opens the blower 6 with only one specific valve 8 among the valves 8 provided in each of the plurality of individual air flow paths L3a, L3b, and L3c in the inspection operation. If the air flow rate per unit time measured by the flow meter 7 at that time exceeds the first set value by more than the first set value, the same individual as the valve 8 in the open state It is determined that the air filter 9 provided in the air flow paths L3a, L3b, and L3c has a breakage abnormality that increases the air flow rate.
On the other hand, in the inspection operation, the control device 10 opens the blower 6 with only one specific valve 8 among the valves 8 provided in each of the plurality of individual air flow paths L3a, L3b, and L3c open. If the flow rate of air per unit time measured by the flow meter 7 is less than the second set value than the reference flow rate, the same individual air as the valve 8 in the open state is operated. It is determined that the air filter 9 provided in the flow paths L3a, L3b, and L3c has a clogging abnormality that reduces the air flow rate. Then, the control device 10 stores the inspection result of the air filter 9 in the storage device 11.

  For example, in the inspection operation, the control device 10 opens only the valve 8a provided in the individual air flow path L3a, and opens the valve 8b provided in the individual air flow path L3b and the valve 8c provided in the individual air flow path L3c. In the closed state, the blower 6 is operated at the blower output 60% of FIG. Then, the control device 10 compares the air flow rate per unit time measured by the flow meter 7 at that time with the reference flow rate and applies it to the air filter 9a provided in the same individual air flow path L3a as the valve 8a. It is determined whether an abnormality has occurred.

  Thereafter, in step # 16, the control device 10 has inspected all the air filters 9, that is, has inspected step # 12 and step # 13 with all the air filters 9 opened separately. If the air filter 9 that has not been inspected still remains, the process proceeds to step # 12. On the other hand, the control apparatus 10 will transfer to process # 17, if the test | inspection of all the air filters 9 is performed.

  In step # 17, the control device 10 reads the inspection results of all the air filters 9 stored in the storage device 11, and identifies the air filter 9 in which no abnormality has occurred. And the control apparatus 10 opens only the valve 8 provided in the same individual air flow path L3a, L3b, L3c as the air filter 9 in which no abnormality has occurred, and the same individual air as the air filter 9 in which the abnormality has occurred. The valve 8 provided in the flow paths L3a, L3b, L3c is closed. Thereafter, the control device 10 releases the idling state of the fuel cell unit 4 and ends the inspection operation processing at the current inspection timing. As described above, when the control device 10 determines that an abnormality has occurred in the air filter 9 during the inspection operation, the individual air flow paths L3a, L3b, Subsequent normal power generation operation is performed with the valve 8 provided at L3c closed.

  As described above, even if an abnormality occurs in any of the air filters 9 provided in each of the plurality of individual air flow paths L3a, L3b, L3c, the same individual air flow path as the air filter 9 in which the abnormality has occurred By closing the valves 8 provided in L3a, L3b, and L3c, air can be prevented from flowing through the air filter 9 in which an abnormality has occurred. In addition, if there is no abnormality in the air filter 9 provided in another individual air flow path L3a, L3b, L3c, the same individual air flow path L3a, L3b, By opening the valve 8 provided in L3c, the air purified by the air filter 9 in which no abnormality has occurred can be supplied to the fuel cell unit 4.

<Another embodiment>
<1>
In the above embodiment, the configuration of the fuel cell system has been described with a specific example, but the configuration can be appropriately changed.
For example, the example in which the number of the individual air flow paths L3a, L3b, and L3c is three has been described in the above-described embodiment. The case can be appropriately changed.

<2>
In the above embodiment, an example is described in which the timing such as 2:00 am once a day is set to the timing for performing the inspection operation, but the frequency of the inspection operation, the execution time, and the like can be appropriately changed. is there. For example, it may be set at 5 am every Monday as the timing for performing the inspection operation, or at 5 am on the 15th of every month as the timing for performing the inspection operation.

<3>
In the above-described embodiment, the example in which the operation state of the fuel cell system is set to the idling state when performing the inspection operation has been described. However, the inspection operation may be performed while the operation state of the fuel cell system remains in the connected state. However, when the blower 6 is operated at a predetermined output during the inspection operation, oxygen (air) necessary for performing the power generation operation in the fuel cell unit 4 needs to be supplied.

<4>
In the above embodiment, the relationship between the blower output and the air flow rate is shown in FIG. 3, but the relationship is described for the purpose of illustration and can be changed as appropriate.

<5>
The configurations disclosed in the above-described embodiments (including other embodiments, the same applies hereinafter) can be applied in combination with the configurations disclosed in the other embodiments as long as no contradiction arises, and are disclosed in this specification. The embodiment is an exemplification, and the embodiment of the present invention is not limited to this, and can be appropriately modified without departing from the object of the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be used for a fuel cell system that can cope with problems such as clogging and breakage that may occur in an air filter.

DESCRIPTION OF SYMBOLS 1 Anode 2 Cathode 4 Fuel cell part 6 Blower 7 Flowmeter 8 Valve 8a Valve 8b Valve 8c Valve 9 Air filter 9a Air filter 9b Air filter 9c Air filter 10 Control apparatus C Cell S Cell stack L3 Air line L3a Individual air flow path L3b Individual air flow path L3c Individual air flow path

Claims (4)

A fuel cell unit including a cell stack in which a plurality of cells each having an anode to which fuel gas is supplied and a cathode to which oxygen gas is supplied is stacked, and flows when air containing the oxygen gas is supplied to the fuel cell unit An air line, a blower for flowing air into the air line toward the fuel cell unit, a flow meter for measuring a flow rate of air supplied to the fuel cell unit through the air line, and a control device A fuel cell system comprising:
On the upstream side or downstream side of the blower, the air line has a plurality of individual air flow paths that merge after the air flows in parallel with each other,
Each of the plurality of individual air flow paths is provided with an air filter and a valve,
The controller is
During normal power generation operation, the output of the blower is adjusted so that the flow rate of air per unit time measured by the flow meter becomes a target flow rate set according to the output power of the cell stack,
During the inspection operation, the blower is operated at a predetermined output with at least one of the valves provided in each of the plurality of individual air flow paths closed and at least one valve opened. Whether or not an abnormality has occurred in the air filter provided in the same individual air flow path as the valve in the open state, based on the air flow rate per unit time sometimes measured by the flow meter A fuel cell system for judging.   When the control device determines that an abnormality has occurred in the air filter during the inspection operation, the control device is provided in the same individual air flow path as the air filter that has been determined to have the abnormality. The fuel cell system according to claim 1, wherein the normal power generation operation is performed after the valve is closed. The control device, in the inspection operation,
A unit time measured by the flowmeter at the time when the blower is operated at a reference output with only one specific valve among the valves provided in each of the plurality of individual air flow paths open. If the flow rate of the hit air is within the first set value when it is greater than the reference flow rate and within the second set value when it is less than the reference flow rate, it is provided in the same individual air flow path as the valve in the open state. It is determined that no abnormality has occurred in the air filter, and there is no abnormality in the air filter if it is not within the first set value in the direction larger than the reference flow rate and not within the second set value in the smaller direction. The fuel cell system according to claim 1, wherein the fuel cell system is determined to have occurred. The control device, in the inspection operation,
A unit that is measured by the flowmeter at the time when the blower is operated at the reference output with only one specific valve among the valves provided in each of the plurality of individual air flow paths open. If the flow rate of air per hour is greater than the reference flow rate and exceeds the first set value, the air filter provided in the same individual air flow path as the valve in the open state has a large air flow rate. If it is determined that a breakage abnormality has occurred and the second set value is less than the reference flow rate, the air filter provided in the same individual air flow path as the valve in the open state is provided. The fuel cell system according to claim 3, wherein it is determined that a clogging abnormality in which the air flow rate decreases is occurring.

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