JP6925209B2 - Fuel cell system - Google Patents

Description

The present invention comprises a fuel cell unit including 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, and when air containing oxygen gas is supplied to the fuel cell unit. An air line that flows through the air line, a blower that allows air to flow through 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 per unit time, and a control device. Regarding the fuel cell system to be equipped.

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

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 a prior art related to the treatment of the filter after it is clogged with foreign matter.
For example, in the fuel cell system described in Patent Document 2, a movable filter is arranged in the middle of the discharge flow path for discharging the 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 is made to prevent the discharge flow path from being blocked due to freezing of water or clogging of foreign matter. There is.
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 steam reforming of the raw material flows. .. In addition, the filter is to be cleaned by discharging the reformed water backflowed by the backflow means to the discharge line.

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

In the fuel cell system described in Patent Document 2 and Patent Document 3, the filter after being clogged with foreign matter or the like is treated to remove the foreign matter, that is, the filter is rotated or the fluid is made to flow back. However, if a mechanism for performing such measures is provided, there is a problem that the system configuration becomes very complicated. In addition, there are problems that it cannot be realized by a system that cannot reverse the fluid, and 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 matter such as dust, but also the problem that the filter is damaged. If the filter is damaged, foreign matter that cannot be removed by the filter may be supplied to the fuel cell unit.

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 capable of dealing with problems such as clogging and breakage that may occur in an air filter.

A characteristic configuration of the fuel cell system according to the present invention for achieving the above object is a fuel cell unit including 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 allows air to flow through the air line toward the fuel cell unit, and the fuel cell unit through the air line. A fuel cell system including a flow meter for measuring the flow rate of air per unit time supplied and a control device.
On the upstream or downstream side of the blower, the air line has a plurality of individual air channels that merge after air flows in parallel with each other.
An air filter and a valve are provided in each of the plurality of individual air flow paths.
The control device is
During the inspection operation, the blower is operated at a predetermined output with only one specific valve among the valves provided in each of the plurality of individual air flow paths open, and at that time, the flow meter is operated. Based on the flow rate of air per unit time measured in, it is determined 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. , With each of the plurality of valves opened in order,
During the normal power generation operation, the valve provided in the same individual air flow path as the air filter determined to have not caused an abnormality by the inspection operation is opened, and the abnormality is determined to have occurred. A target in which the flow rate of air per unit time measured by the flow meter is set according to the output power of the cell stack with the valve provided in the same individual air flow path as the air filter closed. The point is to adjust the output of the blower so that the flow rate is adjusted.

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 same individual air as the air filter in which the abnormality has occurred during normal power generation operation. By closing the valve provided in the flow path, it is possible to prevent air from flowing through the air filter in which an abnormality has occurred. In addition, if no abnormality has occurred in the air filter provided in another individual air flow path, it is provided in the same individual air flow path as the air filter in which the abnormality has not occurred during normal power generation operation . By opening the valve, the air purified by the air filter in which no abnormality has occurred can be supplied to the fuel cell section.
Therefore, it is possible to provide a fuel cell system that can deal with problems such as clogging and breakage that may occur in the air filter.

In addition , according to this feature configuration, the subsequent normal power generation operation is performed with the valve provided in the same individual air flow path as the air filter determined to have an abnormality by the inspection operation closed. Will be. As a result, power can be generated in the fuel cell unit in a state where an appropriate amount of purified oxygen gas (air) is supplied to the cathode of the fuel cell unit.

Yet 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 the reference output, and the air flow rate per unit time measured by the flow meter at that time is within the first set value when it is larger than the reference flow rate and is less than the reference flow rate. If it is within 2 set values, 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 one having a flow rate larger than the reference flow rate is the first. A point in which it is determined that an abnormality has occurred in the air filter if it is not within one set value and less than within the second set value , with each of the plurality of valves opened in order. It is in.

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

Furthermore, the control device, in the test operation, a plurality of the said blower in a state in which only an open particular one valve of the valve provided on each of the individual air passages people to operate at the reference output , then the above if the air flow rate per unit time measured by the flow meter Kere multi exceeds the first set value than the reference flow rate, the same the individual air passages and a valve in the open state the air filter is provided, it is determined that abnormal tear becomes large airflow rate occurs, if Kere little beyond the second set value than the reference flow rate, the same as the valve in the open state It can also be determined that the air filter provided in the individual air flow path has a clogging abnormality in which the air flow rate is reduced.

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

The fuel cell system according to the 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 comprises a fuel cell unit 4 having a cell stack S in which a plurality of cells C having an anode 1 to which fuel gas is supplied and a cathode 2 to which oxygen gas is supplied are stacked, and oxygen gas. It is supplied to the fuel cell unit 4 through the air line L3 that flows when the contained air is supplied to the fuel cell unit 4, the blower 6 that causes air to flow through the air line L3 toward the fuel cell unit 4, and 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 generated power of the fuel cell unit 4 can be supplied to, for example, a power load device or a power system in a house 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, the power conversion unit, and the like 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 by using various types of cells C, such as a solid oxide cell C and a solid polymer cell C. The fuel gas supplied to the anode 1 of the fuel cell unit 4 is generated by the reforming unit 5. For example, a raw material fuel gas containing a hydrocarbon such as city gas (methane or the like) is supplied to the reforming unit 5 via the raw material fuel line L1. An electrolyte section 3 is provided between the anode 1 and the cathode 2. Then, in the reforming section 5, the raw fuel gas is steam reformed to generate a fuel gas containing hydrogen as a main component, and the fuel gas is supplied to the fuel cell section 4 via the fuel line L2. The operation of the reforming unit 5 is controlled by the control device 10.

Although not shown, various auxiliary machines are provided in the fuel cell system. For example, a pump used to circulate cooling water that recovers heat generated in the fuel cell unit 4 while operating a fuel cell, or a pump that circulates hot water stored in a tank to dissipate 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 an interconnected state or an idling state. For example, the interconnection state is a state in which the generated power of the fuel cell unit 4 is supplied to the above-mentioned power load device or power system, and the idling state is a state in which the generated power of the fuel cell unit 4 is supplied to the above-mentioned power load device or power system. It is in a state of being internally consumed by the above-mentioned auxiliary equipment without supplying it to the system. That is, since power is consumed even by the auxiliary equipment that operates while the fuel cell unit 4 is operating, the fuel cell even if the power generated by the fuel cell unit 4 is not supplied to the power load device, the power system, or the like. The operation of the fuel cell unit 4 can be continued while consuming the electric power generated by the unit 4 by 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, L3c that merge after the air flows in parallel with each other. The plurality of individual air flow paths L3a, L3b, L3c may be provided on the upstream side of the blower 6. Further, 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 has 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. It will be provided. The operation of these valves 8 is controlled by the control device 10. As the air filter 9, for example, a cloth-shaped fiber is used. For the valve 8, for example, a solenoid valve or the like is used.

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 operating state of the fuel cell system to the above-mentioned 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, and in the present embodiment, the operating state of the fuel cell system is set to the above-mentioned idling state.

[Normal power generation operation]
During normal power generation operation, the control device 10 has a flow rate of fuel gas per unit time supplied to the anode 1 of the fuel cell unit 4 and a flow rate of oxygen gas per unit time supplied 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 material 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 of the cell stack S becomes a target flow rate set according to the output power of the cell stack S. However, the target flow rate includes the amount of oxygen (air amount) consumed by the cathode 2 of the fuel cell unit 4 for the power generation reaction and the amount of oxygen (air) for burning the anode exhaust gas discharged from the anode 1, for example. Amount) and both may be included. By such control, fuel gas and oxygen gas in an amount 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 during the normal power generation operation.

[Inspection operation]
Since the air filter 9 is installed for the purpose of catching foreign matter in the air, foreign matter gradually accumulates on the air filter 9. That is, the air filter 9 may be clogged with a small amount of airflow. In this case, since the pressure loss in the air filter 9 becomes large, the flow rate of air per unit time measured by the flow meter 7 is set to be the target flow rate set according to the output power of the cell stack S. The blower output must be increased. In addition, holes may be formed in the cloth-shaped air filter 9. In this case, the air filter 9 may have a tear abnormality in which the air volume increases. Then, there may be a problem that the foreign matter in the air is supplied to the fuel cell unit 4 without being removed.

Since there is such a problem, it is necessary to perform an inspection operation at a predetermined timing to determine whether or not an abnormality has occurred in the air filter 9. 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 at least one valve 8 during the inspection operation. The blower 6 is operated at a predetermined output in the open state, and the same individual air flow path as the valve 8 in the open state is obtained based on the flow rate of air per unit time measured by the flow meter 7 at that time. It is determined whether or not an abnormality has occurred in the air filters 9 provided in L3a, L3b, and L3c. However, when the blower 6 is operated at a predetermined output during the inspection operation, the fuel cell unit 4 needs to be supplied with the necessary oxygen (air).

FIG. 2 is a flowchart illustrating an inspection operation process.
In step # 10, the control device 10 determines whether or not it is time to perform the inspection operation. For example, the control device 10 determines that it is the timing to perform the inspection operation once a day at a predetermined time such as 2:00 am (determined as "Yes" in step # 10). , Move to step # 11. If it is not the timing to perform the inspection operation (when it is determined as "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 the idling state.
Next, the control device 10 operates the blower 6 at 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 or not the amount of air per unit time measured by the flow meter 7 is appropriate (Step # 13). Here, the air filter 9 provided in the same individual air flow paths L3a, L3b, L3c as the opened valve 8 is not excessively clogged with foreign matter, and the air filter 9 is also damaged. If this is not the case, an appropriate pressure loss will occur 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, and L3c is open. When the blower 6 is operated at the reference output, the flow rate of air 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 the 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 flow rate of air when incorporated in the device as shown in FIG. 1 (that is, when there is a pressure loss in the air filter 9 or the like) is different. It becomes a value. Therefore, the control device 10 sets 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 operated, 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.

Then, in the inspection operation, the control device 10 outputs the blower 6 as a reference while opening only one specific valve 8 among the valves 8 provided in each of the plurality of individual air flow paths L3a, L3b, and L3c. If the flow rate of air per unit time measured by the flow meter 7 is within the first set value when it is larger than the reference flow rate and within the second set value when it is less than the reference flow rate. It is determined that no abnormality has occurred in the air filters 9 provided in the same individual air flow paths L3a, L3b, L3c as the valve 8 in the open state, and the one having a flow rate higher than the reference flow rate is within the first set value. If it is absent and less than the second set value, it is determined that an abnormality has occurred in the air filter 9 (steps # 12 to # 15). At this time, since it is premised that the fuel cell unit 4 is supplied with the above-mentioned reference flow rate of air, the power generation in the cell stack S is also controlled to the electric power corresponding to the amount of air.

Specifically, 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. Is operated at the reference output, and if the flow rate of air per unit time measured by the flow meter 7 is larger than the reference flow rate by more than the first set value, it is the same as the valve 8 in the open state. It is determined that the air filter 9 provided in the air flow paths L3a, L3b, L3c has a tear abnormality in which the air flow rate increases.
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. When operating at the reference output, if the flow rate of air per unit time measured by the flow meter 7 is less than the reference flow rate by more than the second set value, the same individual air as the valve 8 in the open state. It is determined that the air filter 9 provided in the flow paths L3a, L3b, L3c has a clogging abnormality in which the air flow rate is reduced. 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 of 60% in FIG. Then, the control device 10 compares the flow rate of air per unit time measured by the flow meter 7 at that time with the reference flow rate to the air filter 9a provided in the same individual air flow path L3a as the valve 8a. Determine if an abnormality has occurred.

After that, in step # 16, whether or not the control device 10 has inspected all the air filters 9, that is, whether or not the steps # 12 and # 13 have been inspected with all the air filters 9 opened separately. If there is an air filter 9 that has not been inspected yet, the process proceeds to step # 12. On the other hand, if the control device 10 has inspected all the air filters 9, the process proceeds to step # 17.

In step # 17, the control device 10 reads out 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. Then, the control device 10 opens only the valves 8 provided in the same individual air flow paths L3a, L3b, and L3c as the air filter 9 in which the abnormality has occurred, and the same individual air as the air filter 9 in which the abnormality has occurred. The valves 8 provided in the flow paths L3a, L3b, and L3c are closed. After that, the control device 10 releases the idling state of the fuel cell unit 4 and ends the inspection operation process 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 same individual air flow paths L3a, L3b, as the air filter 9 having determined that the abnormality has occurred, With the valve 8 provided in L3c closed, the subsequent normal power generation operation will be performed.

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, and 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, it is possible to prevent air from flowing through the air filter 9 in which the abnormality has occurred. In addition, if no abnormality has occurred in the air filters 9 provided in the other individual air passages L3a, L3b, L3c, the same individual air passages L3a, L3b, as the air filter 9 in which the abnormality has not occurred, 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 specific examples, but the configuration can be changed as appropriate.
For example, in the above embodiment, the example in which the individual air flow paths L3a, L3b, and L3c are three has been described, but when the individual air flow paths are composed of two individual air flow paths, the individual air flow paths are composed of four or more individual air flow paths. It can be changed as appropriate, such as in some cases.

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

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

<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 exemplification purposes and can be changed as appropriate.

<5>
The configurations disclosed in the above embodiment (including other embodiments, the same shall apply hereinafter) can be applied in combination with the configurations disclosed in other embodiments as long as there is no contradiction, and are disclosed in the present specification. The embodiment is an example, 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.

The present invention can be used in fuel cell systems that can address problems such as clogging and breakage that can occur in air filters.

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

Claims (3)

A fuel cell unit including 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, and an air containing the oxygen gas flows when the fuel cell unit is supplied with air. An air line, a blower for flowing air into the air line toward the fuel cell unit, a flow meter for measuring the flow rate of air supplied to the fuel cell unit through the air line per unit time, and a control device. It is a fuel cell system equipped with
On the upstream or downstream side of the blower, the air line has a plurality of individual air channels that merge after air flows in parallel with each other.
An air filter and a valve are provided in each of the plurality of individual air flow paths.
The control device is
During the inspection operation, the blower is operated at a predetermined output with only one specific valve among the valves provided in each of the plurality of individual air flow paths open, and at that time, the flow meter is operated. Based on the flow rate of air per unit time measured in, it is determined 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. , With each of the plurality of valves opened in order,
During the normal power generation operation, the valve provided in the same individual air flow path as the air filter determined to have not caused an abnormality by the inspection operation is opened, and the abnormality is determined to have occurred. A target in which the flow rate of air per unit time measured by the flow meter is set according to the output power of the cell stack with the valve provided in the same individual air flow path as the air filter closed. A fuel cell system that adjusts the output of the blower so that it has a flow rate. The control device is used in the inspection operation.
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, and the unit time measured by the flow meter at that time. If the flow rate of air per hit is within the first set value when the flow rate is higher than the reference flow rate and within the second set value when the flow rate is lower 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 if the flow rate is greater than the reference flow rate and is not within the first set value and less than the second set value, the air filter is abnormal. The fuel cell system according to claim 1, wherein the determination of occurrence is performed with each of the plurality of the valves opened in order. The control device is used in the inspection operation.
A unit measured by the flow meter 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 larger than the reference flow rate by more than 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 amount of airflow. If it is determined that a tear abnormality has occurred and the flow rate is less than the reference flow rate by more than the second set value, the air filter provided in the same individual air flow path as the valve in the open state is used. The fuel cell system according to claim 2, wherein it is determined that a clogging abnormality in which the air flow rate is reduced has occurred.

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