JP5543232B2 - Fuel cell system - Google Patents

Description

  The present invention relates to a fuel cell system that performs water level maintenance control that maintains a water level within a predetermined range in a water storage unit that stores water used in a fuel cell.

  In a fuel cell system including a fuel cell composed of an anode and a cathode, the gas supplied to the anode is humidified, the gas supplied to the cathode is humidified, and the fuel cell is cooled for various purposes. Water is used. For example, the fuel cell system described in Patent Document 1 includes a water storage unit, and water stored in the water storage unit supplies water vapor used for steam reforming (in addition, gas supplied to the anode) In order to humidify the gas supplied to the cathode, it is used to cool the fuel cell.

  In addition, in the fuel cell system described in Patent Document 1, the water level in the water storage unit is monitored by a water level meter, and the water level of the water storage unit is controlled. For example, in FIG. 5 of Patent Document 1, a supplementary water storage unit that stores water that can be supplied to the water storage unit, a water channel that connects between the supplementary water storage unit and the water storage unit, a valve that can open and close the water channel, and A water pump is described which can energize the water in the channel. And when the water level of a water storage part becomes less than a minimum water level, the water pump is drive | operated and the opening degree of a valve is adjusted, and water is supplied to the water storage part from the supplementary water storage part.

In general, when the water level in the water storage portion decreases, the water supplied to the fuel cell decreases, and the ion conduction performance in the electrolyte between the anode and the cathode decreases, so the output voltage from the fuel cell decreases. The problem can arise. Alternatively, when the water in the water storage part is used as the cooling water for the fuel cell, the flow rate of the cooling water becomes insufficient as the water level decreases, the temperature of the fuel cell rises, and the output voltage decreases. Problems may occur. When such a problem occurs, the power generation operation of the fuel cell must be stopped in order to avoid a decrease or failure in the output voltage of the fuel cell.
However, since the fuel cell system of Patent Document 1 is configured to be able to supply water from the replenishment water storage unit to the water storage unit even when the water level of the water storage unit is lowered, avoid such a problem. The power generation operation of the fuel cell system can be continued.

International Publication No. 01/071837 (Figure 5)

  In the fuel cell system described in Patent Literature 1, measures are taken when an abnormality occurs in a valve provided in a water channel connecting between the replenishment water storage unit and the water storage unit, in particular, the water level of the water storage unit due to the valve abnormality. No measures have been taken in case of rising. Specifically, the valve opens when the valve is closed due to a foreign object biting in, or when the solenoid valve plunger remains attached to the attractor, for example. It may also occur when the valve is in an unexpected state, such as when the valve is closed despite being operated (or opened even though the valve is closed) . And when the valve is in an unexpected state in this way, the water level in the water storage section not only unexpectedly decreases, but also may increase unexpectedly. When the water level rises, there is a problem that water enters the fuel cell and the output voltage from the fuel cell decreases. When water enters the fuel cell, it may not be possible to generate power again unless maintenance such as purging the infused water with an inert gas is performed.

  Thus, in the conventional fuel cell system, when the water level in the water reservoir rises unexpectedly, the power generation operation of the fuel cell must be stopped in order to avoid a decrease in the output voltage or failure of the fuel cell. Absent. In addition, since there is no means to eliminate the state where the water level has risen after power generation is stopped, it is necessary not only to maintain the valve in an unexpected state, but also to purge the water that has entered the fuel cell. The problem that it occurs also occurs.

  The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a fuel cell system in which measures are taken when the water level of the water reservoir rises unexpectedly due to an abnormality of the valve. is there.

The characteristic configuration of the fuel cell system according to the present invention for achieving the above object is as follows:
A fuel cell power generator having a fuel cell composed of an anode and a cathode;
A humidifying water reservoir for anode for storing humidified water for humidifying the gas supplied to the anode;
A humidifying water reservoir for cathode that stores humidified water for humidifying the gas supplied to the cathode;
A water supply device for performing water level maintenance control for maintaining the water level in the humidified water reservoir for anode within a predetermined range for anode and maintaining the water level in the humidified water reservoir for cathode within a predetermined range for cathode;
Control means for controlling the operation of each device,
The water supply device is
A replenishment water storage section for storing water;
A circulation channel that continuously or intermittently circulates the water stored in the replenishment water storage unit so as to return to the replenishment water storage unit again after taking out the water stored outside by a water pump;
An anode water supply channel used when supplying water to the anode humidified water storage unit from the replenishment water storage unit via the circulation channel;
An anode drainage channel used when draining from the anode humidified water reservoir to the replenishment water reservoir;
When supplying water from the replenishment water reservoir to the humidifying water reservoir for cathode via the circulating water channel and when draining from the humidifying water reservoir for cathode to the replenishing water reservoir via the circulating water channel Cathode water supply / drainage,
An anode water supply on / off valve capable of opening and closing the anode water supply path;
An anode drainage on-off valve capable of opening and closing the anode drainage channel;
A cathode water supply / drainage on / off valve capable of opening and closing the cathode water supply / drainage channel,
The control means includes
When a state in which a first abnormal state in which one or both of the humidified water reservoir for anode and the humidified water reservoir for cathode is equal to or higher than the upper limit water level of the predetermined range is detected is detected, Continue the power generation operation of the fuel cell while performing wastewater treatment at the time of abnormality from the humidified water storage part where the abnormality occurred ,
When a state in which a second abnormal state in which one or both of the water levels of the anode humidified water reservoir and the cathode humidified water reservoir are less than the lower limit water level of the predetermined range is detected is detected, Continue the power generation operation of the fuel cell while performing an abnormal water supply process to the humidified water storage section where the abnormality has occurred,
When an abnormal state is detected in which the water level of the humidified water reservoir for anode is equal to or higher than the upper limit water level of the predetermined range for anode and the water level of the humidified water reservoir for cathode is less than the lower limit water level of the predetermined range for cathode. Anode-side drainage for closing the anode water supply on / off valve, opening the anode drainage on / off valve, and closing the cathode water supply / drainage on / off valve with the water pump stopped Performing the processing, stopping the power generation operation of the fuel cell,
When an abnormal state is detected in which the water level of the humidifying water reservoir for anode is less than the lower limit water level of the predetermined range for anode and the water level of the humidifying water reservoir for cathode is equal to or higher than the upper limit water level of the predetermined range for cathode. Cathode drainage for closing the anode water supply on / off valve, closing the anode drain on / off valve, and opening the cathode water supply / drain on / off valve with the water pump stopped The processing is performed and the power generation operation of the fuel cell is stopped .

According to the above characteristic configuration, even if the first abnormal state occurs in which one or both of the water levels for the anode humidified water reservoir and the cathode humidified water reservoir are equal to or higher than the upper limit water level of each predetermined range, When the control means performs the above-described abnormal drainage process to reduce the water level, the water levels of the anode humidified water reservoir and the cathode humidified water reservoir can both be within the predetermined ranges. Thus, even if the first abnormal state occurs, measures are taken such that the water levels of the humidifying water reservoir for the anode and the humidifying water reservoir for the cathode are both within the predetermined ranges. Driving can be continued.
Therefore, it is possible to provide a fuel cell system in which measures are taken when the water level in the water reservoir rises unexpectedly due to an abnormal valve.
In addition, even when a second abnormal state occurs in which one or both of the anode humidified water storage unit and the cathode humidified water storage unit are below the lower limit water level within the predetermined range, the control means does not supply the abnormal time supply. By performing a water treatment to increase the water level, both the anode humidified water reservoir and the cathode humidified water reservoir can be within a predetermined range. As described above, even when the second abnormal state occurs, a measure is taken so that the water levels of the humidifying water reservoir for the anode and the humidifying water reservoir for the cathode are both within the predetermined range. Can continue.
Further, it is detected that an abnormal state has occurred in which one of the humidified water reservoirs for the anode and the humidified water reservoir for the cathodes has a water level equal to or higher than the upper limit water level in the predetermined range and the other water level is lower than the lower limit water level in the predetermined range. In this case, by stopping the power generation operation of the fuel cell, it is possible to avoid a decrease in the output voltage or failure of the fuel cell. In addition, in the humidified water reservoir for the anode and the humidified water reservoir for the cathode, there is an abnormal state in which one water level is equal to or higher than the upper limit water level of the predetermined range and the other water level is lower than the lower limit water level of the predetermined range. If detected, the power generation operation of the fuel cell is stopped, and drainage treatment from the humidified water storage part where the water level is equal to or higher than the upper limit water level is performed, so that the water level is lower than the cancellation of the state where the water level is lowered. Priority is given to the cancellation of the state of rising. As a result, it is possible to avoid water from entering the fuel cell from the humidified water storage section whose water level is equal to or higher than the upper limit water level.

Another characteristic configuration of the fuel cell system according to the present invention is:
Before Symbol control means,
When the water level of the anode humidified water storage unit is detected to be equal to or higher than the upper limit water level of the predetermined range for the anode as the first abnormal state, the water supply for the anode is stopped. The on-off valve is closed, and the anode drain on-off valve is opened.
When the state where the water level of the humidifying water storage section for the cathode is equal to or higher than the upper limit water level of the predetermined range for the cathode is detected as the first abnormal state, the water supply / drainage for the cathode is stopped in a state where the water pump is stopped It is in the point which performs the waste water treatment at the time of the said abnormality which opens an on-off valve.

  According to the above characteristic configuration, even when the first abnormal state in which the water level in the humidified water reservoir for anode is equal to or higher than the upper limit water level of the predetermined range for anode occurs, the control means stops the water pump in the state where the water pump is stopped. The anode humidified water storage part is configured to close the water supply on-off valve and open the anode drain on-off valve to reduce the water level of the anode humidified water storage part The water level can be returned to within a predetermined range for the anode. Furthermore, even if the first abnormal state occurs in which the water level in the cathode humidified water storage section is equal to or higher than the upper limit water level of the predetermined range for the cathode, the control means opens the cathode water supply / drainage on / off valve with the water pump stopped. The water level in the cathode humidified water storage section can be returned to a predetermined range for the cathode by performing an abnormal drainage treatment to perform the opening operation and reducing the water level in the cathode humidified water storage section.

Still another characteristic configuration of the fuel cell system according to the present invention is:
The control means includes
The water pump is stopped when it is detected that the water level of both the anode humidified water reservoir and the cathode humidified water reservoir is equal to or higher than the upper limit water level of the predetermined range as the first abnormal state. In this state, the anode water supply on / off valve is closed, the anode drainage on / off valve is opened, and the cathode water supply on / off valve is opened. .

  According to the above characteristic configuration, even if the first abnormal state in which the water levels of both the humidifying water reservoir for the anode and the humidifying water reservoir for the cathode are equal to or higher than the upper limit water level within the predetermined range occurs, the control means In the stopped state, the anode feed water on-off valve is closed, the anode drain on-off valve is opened, and the cathode water feed on-off valve is opened to perform the wastewater treatment at the time of abnormality, and the humidified water for anode Both the water levels of the storage unit and the humidified water storage unit for cathode can be returned to within a predetermined range.

Still another characteristic configuration of the fuel cell system according to the present invention is:
Before Symbol control means,
When the water level of the humidified water reservoir for anode is less than the lower limit water level of the predetermined range for anode as the second abnormal state, the water supply for anode is operated in the state where the water pump is operated. Opening the on-off valve, and performing the abnormal time water supply treatment to close the anode drain on-off valve,
When it is detected that the water level in the cathode humidified water reservoir is less than the lower limit water level of the predetermined range for the cathode as the second abnormal state, the water supply / drainage for the cathode is operated in the state where the water pump is operated. Perform the abnormal water supply treatment to open the on-off valve,
When the state in which the water levels of both the anode humidified water reservoir and the cathode humidified water reservoir are below the lower limit water level of the predetermined range is detected as the second abnormal state, the water pump is operated. The anode water supply on / off valve is opened, the anode drain on / off valve is closed, and the cathode water supply on / off valve is opened. .

  According to the above characteristic configuration, even when the second abnormal state in which the water level in the humidified water reservoir for anode is less than the lower limit water level of the predetermined range for anode occurs, the control means operates in the state where the water pump is operated. The anode humidified water storage part is configured to open the water supply on / off valve for the anode, and to perform the water supply treatment for abnormal conditions in which the drain discharge on / off valve for the anode is closed to raise the water level of the humidified water storage part for the anode. The water level can be returned to within a predetermined range for the anode. Furthermore, even if a second abnormal state occurs in which the water level in the cathode humidified water reservoir is less than the lower limit water level of the predetermined range for the cathode, the control means operates the water supply / drainage on / off valve for the cathode while the water pump is in operation. The water level in the cathode humidified water reservoir can be returned to a predetermined range for the cathode by performing a measure of raising the water level in the cathode humidified water reservoir by performing an abnormal time water supply treatment that opens. Furthermore, even when a second abnormal state occurs in which the water level of both the anode humidified water storage unit and the cathode humidified water storage unit is less than the lower limit water level within the predetermined range, the control means operates the water pump. The anode water supply opening / closing valve is opened, the anode drainage opening / closing valve is closed, and the cathode water supply / drainage opening / closing valve is opened. Both the water levels in the humidifying water storage section can be returned to within a predetermined range.

  Still another characteristic configuration of the fuel cell system according to the present invention is that the water supply device includes an ion exchange resin device in the middle of the circulating water channel.

  According to the above characteristic configuration, since water circulates continuously or intermittently in the circulation channel, water also flows continuously or intermittently into the ion exchange resin device provided in the middle of the circulation channel. That is, since the ion exchange process of water stored in the replenishment water storage unit and circulating through the circulation channel is continuously or intermittently performed, the water supplied to the humidification water storage unit for the anode and the humidification water storage unit for the cathode is It is ensured that the water has been subjected to ion exchange treatment.

It is a schematic block diagram of the fuel cell system of this invention. It is a schematic block diagram of the fuel cell system of another embodiment.

The fuel cell system according to the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a fuel cell system of the present invention. The fuel cell system S1 (S) of the present embodiment includes a fuel cell power generation device 10A (10), a water supply device 30A (30), and a control means Z that controls the operation of each of the devices 10A and 30A.
Hereinafter, the configuration of the fuel cell power generation device 10A and the configuration of the water supply device 30A will be described.

[Configuration of fuel cell power generator]
The fuel cell power generator 10A includes a fuel cell 12 including an anode 12a, a cathode 12b, and an electrolyte 12c provided between the anode 12a and the cathode 12b. Furthermore, the fuel cell power generator 10A of the present embodiment is provided with a reformer 11 that reforms a hydrocarbon-based gas such as methane or a raw fuel such as alcohol to generate a gas mainly composed of hydrogen. ing. The fuel cell 12 is configured in the form of a cell stack in which a plurality of cells formed by sandwiching an electrolyte 12c between an anode 12a and a cathode 12b are stacked. In FIG. 1, only a single cell is shown for simplicity. A gas mainly composed of hydrogen generated by the reformer 11 is supplied to the anode 12a. Oxygen (air) is supplied to the cathode 12b.

  Furthermore, 10 A of fuel cell electric power generating apparatuses are the humidification water storage part for anodes (humidification water storage part) 13 and the humidification water storage part for cathodes (humidification water storage part) as the water storage part T which stores the water utilized with the fuel cell 12. ) 14. The gas supplied to the anode 12a is humidified in contact with the water stored in the humidification water storage section 13 for anode during the supply. That is, the anode humidified water storage unit 13 functions as an anode humidifier Wa that humidifies the gas supplied to the anode 12a. Similarly, the gas supplied to the cathode 12b comes into contact with the water stored in the cathode humidified water storage section 14 and is humidified during the supply. In other words, the cathode humidifying water reservoir 14 functions as a cathode humidifier Wb that humidifies the gas supplied to the cathode 12b.

The anode humidified water storage unit 13 is a sensor capable of detecting whether or not the water level is within a predetermined range for the anode where the water level is less than the upper limit water level and equal to or higher than the lower limit water level, that is, the stored water exceeds the upper limit water level. A level sensor 13a capable of detecting whether or not the water is stored and a level sensor 13b capable of detecting whether or not the stored water is below the lower limit water level. Similarly, a sensor capable of detecting whether the water level is within a predetermined range for the cathode where the water level is lower than the upper limit water level and equal to or higher than the lower limit water level, that is, the stored water is the upper limit in the cathode humidified water storage unit 14. A level sensor 14a capable of detecting whether or not the water level is equal to or higher than the water level and a level sensor 14b capable of detecting whether or not the stored water is lower than the lower limit water level are provided.
The capacity of the anode humidified water storage section 13 and the capacity of the cathode humidified water storage section 14 may be the same or different. Further, the predetermined range for anode (upper limit water level and lower limit water level) in the humidifying water reservoir 13 for anode and the predetermined range for cathode (upper limit water level and lower limit water level) in the humidified water reservoir for cathode 14 are set separately. Yes.

[Configuration of water supply device]
The water supply device 30 </ b> A includes a supplementary water storage unit 32 that stores water that can be supplied to the anode humidification water storage unit 13 and the cathode humidification water storage unit 14 as the water storage unit T, and the supplementary water storage unit 32 and anode. Solenoid valves V (Va, Vb, V, V, V) that can open and close water channels 33, 35, 36, and 37, and water channels 35, 36, and 37 that connect between the humidified water storage unit 13 and the cathode humidified water storage unit 14. Vc) and a water pump 34 capable of energizing water in the water channels 33, 35, 36, 37. Further, the control means Z functions to perform water level maintenance control for maintaining the water level in the water reservoir T of the water supply device 30A within a predetermined range.

  In the present embodiment, the water supply device 30 </ b> A includes a circulation water channel 33 and an anode water supply channel 35 as water channels that connect the replenishment water storage unit 32, the anode humidification water storage unit 13, and the cathode humidification water storage unit 14. And an anode drainage channel 36 and a cathode water supply / drainage channel 37. For example, in the circulation channel 33, the water stored in the replenishment water storage unit 32 is continuously or intermittently returned to the replenishment water storage unit 32 after being taken out of the replenishment water storage unit 32 by the water pump 34. Circulated.

  The anode water supply channel 35 is provided so as to connect between the circulation water channel 33 and the anode humidified water storage unit 13. The anode water supply channel 35 is connected to the anode humidification water storage unit 13 via the circulation water channel 33 from the replenishment water storage unit 32. Used when supplying water. In the middle of the anode water supply path 35, an anode water supply electromagnetic valve (an example of an anode water supply on / off valve) Va capable of opening and closing the anode water supply path 35 is provided.

  The anode drainage channel 36 is provided so as to connect between the anode humidifying water reservoir 13 and the supplementary water reservoir 32 and is used when draining from the anode humidifying water reservoir 13 to the supplementary water reservoir 32. It is done. An anode drain electromagnetic valve (an example of an anode drain on / off valve) Vb capable of opening and closing the anode drain channel 36 is provided in the middle of the anode drain channel 36.

  The cathode water supply / drainage channel 37 is provided so as to connect between the anode water supply channel 35 and the cathode humidified water storage unit 14, and passes from the replenishment water storage unit 32 through the circulation water channel 33 and the anode water supply channel 35. This is also used when supplying water to the humidifying water reservoir for cathode 14 and when draining from the humidifying water reservoir for cathode 14 to the replenishing water storing portion 32 via the anode water supply channel 35 and the circulation water channel 33. In the middle of the cathode water supply / drainage channel 37, a cathode water supply / drainage electromagnetic valve (an example of a cathode water supply / drainage open / close valve) Vc capable of opening and closing the cathode water supply / drainage channel 37 is provided.

The water supply device 30 </ b> A includes an ion exchange resin device 31 in the middle of the circulation water channel 33. During normal operation when power generation is performed in the fuel cell power generation apparatus 10A, the anode water supply electromagnetic valve Va, the anode water discharge electromagnetic valve Vb, and the cathode water supply and discharge electromagnetic valve Vc are closed, and the humidified water storage for the anode is stored. Both the unit 13 and the cathode humidified water storage unit 14 are isolated from the replenishment water storage unit 32.
During the normal operation of the fuel cell power generator 10A, the water supply device 30A circulates the water stored in the replenishment water storage unit 32 through the circulation channel 33 while the water pump 34 is operated. That is, since the water stored in the replenishment water storage unit 32 passes through the ion exchange resin device 31 while circulating in the circulation water channel 33, the ion exchange process is continuously performed. As a result, it is ensured that the water supplied to the anode humidified water reservoir 13 and the cathode humidified water reservoir 14 is water that has been subjected to the ion exchange treatment.

[Normal operation of fuel cell power generator]
If the power generation operation of the fuel cell power generator 10A is continued, the water level in the anode humidified water storage section 13 and the water level in the cathode humidified water storage section 14 will decrease. This is because the water in the anode humidified water reservoir 13 is used to humidify the gas supplied to the anode 12a, and the water in the cathode humidified water reservoir 14 is used to humidify the gas supplied to the cathode 12b. This is because it is used. Therefore, when the control means Z became less than the lower limit water level based on the output result of the level sensor 13b which can detect whether the water stored in the humidification water storage part 13 for anodes is less than a lower limit water level. If it determines, the water supply process to the humidification water storage part 13 for anodes mentioned later is performed. Similarly, the control means Z becomes less than the lower limit water level based on the output result of the level sensor 14b that can detect whether or not the water stored in the humidified water reservoir for cathode 14 is less than the lower limit water level. If it is determined that the water has been supplied, a water supply process to the humidifying water reservoir for cathode 14 as described later is performed.

  In addition, in the fuel cell system S1 of the present embodiment, at least a part of the water stored in the anode humidified water storage unit 13 is periodically replaced and stored in the cathode humidified water storage unit 14. At least a portion of the water is replaced. At that time, the control means Z performs the waste water treatment from the humidifying water reservoir for anode 13 and the waste water treatment from the humidifying water reservoir for cathode 14 as described later. For the purpose of replacing the water stored in the humidifying water reservoir 13 for the anode and the humidifying water reservoir 14 for the cathode, the components in the gas supplied to the anode 12a and the components in the gas supplied to the cathode 12b are different. It exists in the point which melt | dissolves in the water currently stored by the humidification water storage parts 13 and 14, and is utilized in the state where the electrical conductivity of water has risen.

  Below, the control means Z performs the water level maintenance control (water supply to the anode humidified water storage unit 13) for maintaining the water level in the water storage unit T within a predetermined range, which is performed during the normal operation of the fuel cell power generator 10A. The contents of the treatment, the drainage treatment from the humidification water reservoir for anode 13, the water supply treatment to the humidification water reservoir for cathode 14, and the drainage treatment from the humidification water reservoir for cathode 14) will be described.

[Water supply to the humidified water reservoir for the anode]
When the control means Z determines that the water level of the humidifying water reservoir for anode 13 has become lower than the lower limit water level based on the detection result of the level sensor 13b as described above, the anode water supply channel with the water pump 34 operated. The anode water supply electromagnetic valve Va provided at 35 is opened. In the present embodiment, the control means Z controls the amount of water delivered per unit time from the water pump 34 to be constant and opens the anode water supply electromagnetic valve Va for a predetermined time, so that the upper limit water level is exceeded. Supply water to a level below the water level. That is, the control means Z manages the water supply amount to the humidification water storage part 13 for anodes by water supply time. As a result, a predetermined amount of water is supplied from the replenishment water reservoir 32 to the anode humidified water reservoir 13, and the water level in the anode humidified water reservoir 13 is maintained within the anode predetermined range.
In this way, during the normal operation of the fuel cell power generation device 10A, the water level stored in the anode humidified water storage unit 13 does not exceed the upper limit water level and is lower than the lower limit water level. Does not continue beyond the first set time. The first set time is from when it is detected that the water level of the humidifying water reservoir for anode 13 is less than the lower limit water level until the water level of the humidifying water reservoir for anode 13 becomes equal to or higher than the lower limit water level by the water supply process. Is equivalent to

[Water supply to the humidified water reservoir for the cathode]
If the control means Z determines that the water level of the humidifying water reservoir for cathode 14 is lower than the lower limit water level based on the detection result of the level sensor 14b as described above, the water supply channel for cathode is operated with the water pump 34 being operated. The cathode water supply / drainage electromagnetic valve Vc provided at the opening is opened. In the present embodiment, the control means Z controls the amount of water delivered per unit time from the water pump 34 to be constant and opens the cathode water supply / drainage electromagnetic valve Vc for a predetermined time, thereby opening the upper limit water level above the lower limit water level. Supply water to a level that is less than That is, the control means Z manages the water supply amount to the cathode humidified water storage unit 14 by the water supply time. As a result, a predetermined amount of water is supplied from the replenishment water reservoir 32 to the cathode humidified water reservoir 14, and the water level in the cathode humidified water reservoir 14 is maintained within the predetermined range for the cathode.
As described above, during the normal operation of the fuel cell power generation device 10A, the water level stored in the cathode humidified water storage unit 14 does not exceed the upper limit water level and is lower than the lower limit water level. Does not continue beyond the second set time. The second set time is from when it is detected that the water level of the humidifying water reservoir for cathode 14 is less than the lower limit water level until the water level of the humidifying water reservoir for cathode 14 becomes equal to or higher than the lower limit water level by the water supply process. Is equivalent to

[Drainage treatment from humidified water reservoir for anode]
When the control means Z reaches the replacement timing of the water stored in the humidifying water storage section 13 for anodes (for example, once every 10 minutes, etc.), the draining electromagnetic for anode provided in the anode drain passage 36 is provided. For example, the valve Vb is opened until the water level of the humidified water reservoir for anode 13 is less than the lower limit water level. Since the anode drainage channel 36 is isolated from the circulating water channel 33, the water pump 34 may remain operated. As a result, drainage from the humidifying water reservoir for anode 13 to the supplementary water reservoir 32 is performed. However, not all of the water in the anode humidified water storage unit 13 is discharged, but water that can humidify the reformed gas (hydrogen) flowing into the anode humidified water storage unit 13 is left in the anode humidified water storage unit 13. It is necessary to keep.
When the waste water treatment is completed, the control unit Z performs the water supply process to the anode humidified water storage unit 13 and supplies the ion-exchanged water from the replenishment water storage unit 32 to the anode humidified water storage unit. 13 is supplied. The time from when the drainage treatment is performed and the water level of the humidification water reservoir for anode 13 becomes less than the lower limit water level until the water level of the humidification water reservoir for anode 13 becomes equal to or higher than the lower limit water level by the water supply treatment is the first time. Corresponds to the set time.

[Drainage treatment from humidified water storage for cathode]
When it is time to replace the water stored in the cathode humidified water storage section 14 (for example, once every 10 minutes), the control means Z stops the water pump 34 and stops the water supply / drain channel 37 for the cathode. For example, the cathode water supply / drainage electromagnetic valve Vc is opened until the water level of the humidification water reservoir for cathode 14 becomes less than the lower limit water level. As a result, drainage from the humidifying water reservoir for cathode 14 to the circulation water channel 33 is performed. However, not all the water in the cathode humidified water storage unit 14 is discharged, but water that can humidify oxygen (air) flowing into the cathode humidified water storage unit 14 is left in the cathode humidified water storage unit 14. There is a need.
When the waste water treatment is completed, the control unit Z performs the water supply process to the cathode humidified water storage unit 14 described above to supply the ion-exchanged water from the replenishment water storage unit 32 to the cathode humidified water storage unit 14. To supply. The time from when the drainage treatment is performed and the water level of the humidifying water reservoir for cathode 14 becomes less than the lower limit water level until the water level of the humidifying water reservoir for cathode 14 becomes equal to or higher than the lower limit water level due to the water supply treatment is the second time. Corresponds to the set time.

As described above, if the control unit Z performs the water level maintenance control as described above during the normal operation of the fuel cell power generation apparatus 10A, the anode humidification water storage unit 13 and the cathode humidification water storage unit 14 are provided. The water level of the stored water never exceeds the upper limit water level, and the state in which the water level of the humidification water storage section for anode 13 is less than the lower limit water level continues for the first set time or more and the humidification water storage for cathode The state where the water level of the section 14 is less than the lower limit water level does not continue for the second set time or longer.
Therefore, the control means Z detects that the water level in the anode humidified water storage section 13 or the cathode humidified water storage section 14 cannot be maintained within a predetermined range even when the water level maintenance control is performed, that is, the upper limit water level. When it has been detected that the water level in the anode humidified water storage unit 13 is lower than the lower limit water level, or when the water level in the cathode humidified water storage unit 14 is lower than the lower limit water level. If it is detected that the state of less than the second set time has continued, it is determined that an abnormality has occurred.

In the present embodiment, it is assumed that the above abnormalities are caused by abnormalities in the valves (anode water supply electromagnetic valve Va, anode drainage electromagnetic valve Vb, cathode water supply electromagnetic valve Vc). That is, the control means Z estimates that the water level of the anode humidified water reservoir 13 or the cathode humidified water reservoir 14 has unexpectedly increased or decreased due to an abnormality of these valves.
Below, abnormalities in which the water level stored in the humidifying water reservoir for anode 13 or the humidifying water reservoir for cathode 14 becomes higher than the upper limit water level due to the abnormality of these valves, and the humidifying water reservoir for anode 13 The reason why an abnormality in which the state where the water level is less than the lower limit water level continues for the first set time or an abnormality in which the state where the water level in the cathode humidifying water reservoir 14 is less than the lower limit water level continues for the second set time or more will be described. .

[Abnormal humidity level in the humidified water reservoir for the anode exceeds the upper limit level]
This abnormality may occur when the anode water supply electromagnetic valve Va is opened despite being closed.
Specifically, the control means Z attempts to stop water supply to the anode humidified water storage unit 13 by closing the anode water supply electromagnetic valve Va. However, for example, the anode water supply electromagnetic valve Va may actually be in an open state due to biting of foreign matter. In this case, during the normal operation of the fuel cell power generator 10A, the water pump 34 is continuously operated except for the time period during which the water pump 34 is stopped in the above-described water level maintenance control. The water that has passed through the anode water supply electromagnetic valve Va continues to be supplied to the anode humidified water reservoir 13. As a result, an abnormality occurs in which the water level of the anode humidified water storage unit 13 becomes equal to or higher than the upper limit water level.

[Abnormality in which the water level of the humidifying water reservoir for anode is below the lower limit water level continues for the first set time or longer]
This abnormality may occur when the anode water supply electromagnetic valve Va is closed despite being opened, or when the anode drainage electromagnetic valve Vb is closed but opened. .
Specifically, the control means Z tries to start water supply to the anode humidified water storage unit 13 by opening the anode water supply electromagnetic valve Va. However, for example, the plunger of the anode water supply electromagnetic valve Va may remain in a closed state despite the fact that the plunger is still attached to the suction element, even though the valve opening operation is being performed. In this case, since the water supply to the humidification water storage part 13 for anodes is not performed, the abnormality which the state where the water level of the humidification water storage part 13 for anodes becomes less than a minimum water level continues more than 1st setting time generate | occur | produces.
Alternatively, the control means Z attempts to stop drainage from the anode humidified water storage section 13 by closing the anode drain electromagnetic valve Vb. However, for example, the anode drain electromagnetic valve Vb may actually be in an open state due to a foreign object biting in. In this case, the water that has passed through the anode humidifying water storage section 13 and the anode drain electromagnetic valve Vb continues to be drained to the supplementary water storage section 32. As a result, an abnormality occurs in which the state in which the water level of the humidifying water reservoir for anode 13 is less than the lower limit water level continues for the first set time or longer.

(Abnormality when the water level in the humidifying water reservoir for the cathode exceeds the upper limit level)
This abnormality may occur when the cathode water supply / drainage electromagnetic valve Vc is opened despite being closed.
Specifically, the control means Z attempts to stop the water supply to the cathode humidified water storage section 14 by closing the cathode water supply / drainage electromagnetic valve Vc. However, for example, the cathode water supply / drainage electromagnetic valve Vc may actually be in an open state due to the biting of foreign matter. In this case, during the normal operation of the fuel cell power generator 10A, the water pump 34 is continuously operated except for the time period during which the water pump 34 is stopped in the above-described water level maintenance control. The water that has passed through the cathode water supply / drainage electromagnetic valve Vc continues to be supplied to the cathode humidification water reservoir 14. As a result, an abnormality occurs in which the water level of the humidifying water reservoir for cathode 14 becomes equal to or higher than the upper limit water level.

[Abnormality in which the water level in the humidifying water reservoir for the cathode is below the lower limit water level continues for the second set time or longer]
This abnormality may occur when the cathode water supply / drainage electromagnetic valve Vc is opened but closed.
Specifically, the control means Z tries to start the water supply to the cathode humidified water storage unit 14 by opening the cathode water supply / drainage electromagnetic valve Vc. However, for example, the plunger of the cathode water supply / drainage electromagnetic valve Vc may remain in a closed state despite the fact that the plunger is still attached to the suction element, even though the valve opening operation is being performed. In this case, since water supply to the humidification water reservoir 14 for cathodes is not performed, the abnormality which the state where the water level of the humidification water storage part 14 for cathodes becomes less than a minimum water level continues more than 2nd setting time generate | occur | produces.

As described above, the humidified water reservoir for anode 13 or the cathode is caused by any one of the abnormality that is opened despite the closing operation and the abnormality that is closed despite the opening operation. An abnormality in which the water level stored in the humidifying water storage unit 14 is higher than the upper limit water level and an abnormality in which the water level is lower than the lower limit water level may continue for the first set time or the second set time.
Table 1 below shows the abnormality of the water level occurring in the humidifying water reservoir 13 for the anode or the humidifying water reservoir 14 for the cathode, the abnormal state of the valve when the abnormal state is detected, and the measures for the abnormal state Describe.
However, in Table 1, an abnormality where the water level is higher than the upper limit water level is described as “high water level abnormality”, and the state where the water level is lower than the lower limit water level continues for the set time or longer (the first set time or the second set time or longer). This abnormality is described as “low water level abnormality”.

[First abnormal state (abnormal states A, C, G)]
As shown in Table 1, the control means Z is a first abnormal state in which one or both of the anode humidified water reservoir 13 and the cathode humidified water reservoir 14 are equal to or higher than the upper limit water level within a predetermined range. When a state in which (abnormal state A, C, G) has occurred is detected, the power generation operation of the fuel cell 12 is continued while performing an abnormal drainage process from the water storage unit where the abnormality has occurred.
As described above, even when the first abnormal state occurs in which one or both of the anode humidified water storage unit 13 and the cathode humidified water storage unit 14 exceed the upper limit water level within the predetermined range, the control means When Z performs the above-described wastewater treatment at the time of abnormality and lowers the water level, the water levels of the humidifying water reservoir for anode 13 and the humidifying water reservoir for cathode 14 can both be within a predetermined range. As a result, the power generation operation of the fuel cell 12 can be continued.

Specifically, the control unit Z detects a state in which an abnormal state A in which the water levels of both the anode humidified water storage unit 13 and the cathode humidified water storage unit 14 are equal to or higher than the upper limit water level within a predetermined range is detected. In addition, in the state where the water pump 34 is stopped, the anode humidified water storage unit 13 tries to lower the water level (that is, the anode water supply electromagnetic valve Va is closed, and the anode drain electromagnetic valve Vb). In addition, an abnormal drainage process is performed, and the cathode humidified water storage unit 14 attempts to lower the water level (that is, the cathode supply / drain electromagnetic valve Vc is opened). .
Furthermore, the control means Z is the state which stopped the water pump 34, when the state which the abnormal state C into which only the water level of the humidification water storage part 13 for anodes becomes more than the upper limit water level of the predetermined range for anodes was detected is detected. In the humidifying water storage section 13 for anode, an abnormal drainage process is performed to lower the water level (that is, the anode feed solenoid valve Va is closed and the anode drain solenoid valve Vb is opened). .
Furthermore, the control means Z stops the water pump 34 when an abnormal state G is detected in which only the water level in the cathode humidified water reservoir 14 is equal to or higher than the upper limit water level of the predetermined range for the cathode. In this state, an abnormal drainage process is performed on the cathode humidified water storage unit 14 to lower the water level (that is, to open the cathode water supply / drainage electromagnetic valve Vc).
The control means Z operates the solenoid valve V so that both the supply and discharge of water are stopped if there is no abnormality in the water levels of the anode humidifying water storage section 13 and the cathode humidifying water storage section 14.

[Second abnormal state (abnormal states E, F, H)]
The control means Z includes a second abnormal state (abnormal state E, F, or the like) in which one or both of the anode humidified water storage unit 13 and the cathode humidified water storage unit 14 are below a lower limit water level within a predetermined range. When the state in which H) occurs is detected, the power generation operation of the fuel cell 12 is continued while performing an abnormal water supply process to the water storage section where the abnormality has occurred.
As described above, even when the second abnormal state in which one or both of the water levels of the humidifying water reservoir 13 for the anode and the humidifying water reservoir 14 for the cathode is less than the lower limit water level within the predetermined range occurs, the control means When Z performs the above-described abnormal water supply process to increase the water level, the water levels of the anode humidified water reservoir 13 and the cathode humidified water reservoir 14 can both be within a predetermined range. As a result, the power generation operation of the fuel cell 12 can be continued.

Specifically, the control means Z has caused a second abnormal state (abnormal state E) in which the water levels of both the humidifying water reservoir for anode 13 and the humidifying water reservoir for cathode 14 are less than the lower limit water level within a predetermined range. When the state is detected, the water level of the humidifying water reservoir for anode 13 is to be raised with the water pump 34 operated (that is, the anode water supply electromagnetic valve Va is opened, and the anode Abnormal water supply treatment is performed, and the cathode humidified water storage unit 14 is to increase the water level (that is, the cathode water supply / drain electromagnetic valve Vc is opened). Perform water treatment.
Further, the control means detects the water pump 34 when a state in which the second abnormal state (abnormal state F) in which only the water level of the humidifying water reservoir for anode 13 is less than the lower limit water level of the predetermined range for anode is detected is detected. In the state of operating the humidifying water reservoir for anode 13, an abnormality is attempted to raise the water level (that is, the anode water supply electromagnetic valve Va is opened and the anode drainage electromagnetic valve Vb is closed). Perform hourly water treatment.
Still further, the control means detects the water pump when a state in which the second abnormal state (abnormal state H) in which only the water level of the humidifying water reservoir for cathode 14 is lower than the lower limit water level of the predetermined range for cathode is detected. In the state where 34 is operated, the water supply process at the time of abnormality is performed for the humidifying water reservoir for cathode 14 to increase the water level (that is, to open the cathode water supply / drainage electromagnetic valve Vc).
The control means Z operates the solenoid valve V so that both the supply and discharge of water are stopped if there is no abnormality in the water levels of the anode humidifying water storage section 13 and the cathode humidifying water storage section 14.

[Third abnormal state (abnormal state B, D)]
The control means Z includes a third abnormality in which one of the anode humidified water reservoir 13 and the cathode humidified water reservoir 14 is equal to or higher than an upper limit water level within a predetermined range and the other water level is lower than a lower limit water level within a predetermined range. When the state (abnormal state B, D) is detected, the power generation operation of the fuel cell 12 is stopped. As a result, it is possible to avoid a decrease or failure in the output voltage of the fuel cell 12.

Specifically, the control means Z is configured so that the water level in the anode humidified water storage section 13 is equal to or higher than the upper limit water level of the anode predetermined range and the water level in the cathode humidified water storage section 14 is lower than the lower limit water level of the cathode predetermined range. When a state where an abnormal state (abnormal state B) has occurred is detected, the power generation operation of the fuel cell is stopped. However, the control means Z closes the anode water supply electromagnetic valve Va with the water pump 34 stopped, opens the anode water discharge electromagnetic valve Vb, and turns off the cathode water supply electromagnetic valve Vc. Anode side drainage treatment is performed. That is, the control means Z tries to lower the water level of the humidification water reservoir 13 for anode by the waste water treatment, and keep the water level of the humidification water reservoir 14 for cathode as it is.
Further, the control means Z provides a third abnormality in which the water level in the cathode humidifying water storage section 14 is equal to or higher than the upper limit water level of the cathode predetermined range and the water level in the anode humidifying water storage section 13 is lower than the lower limit water level in the anode predetermined range. When the state (abnormal state D) is detected, the power generation operation of the fuel cell is stopped. However, the control means Z closes the anode water supply electromagnetic valve Va, closes the anode water discharge electromagnetic valve Vb, and turns off the cathode water supply and discharge electromagnetic valve Vc with the water pump 34 stopped. The cathode side drainage treatment is performed. That is, the control means Z tries to maintain the water level of the humidifying water reservoir for anode 13 as it is, and tries to lower the water level of the humidifying water reservoir for cathode 14 by drainage treatment.
As described above, when the third abnormal state occurs, the power generation operation of the fuel cell 12 is stopped, and the water level is lowered by performing the drainage treatment from the humidified water storage portion whose water level is equal to or higher than the upper limit water level. The water from the anode humidified water storage section 13 or the cathode humidified water storage section 14 to the fuel cell 12 (fuel cell) is prioritized over the cancellation of the state in which the water level has risen over the cancellation of the completed state. Can be avoided.

<Another embodiment>
<1>
In the above embodiment, the configuration example of the fuel cell system S has been described with reference to the drawings. However, the configuration of the fuel cell system S can be modified. Specifically, if the fuel cell system S according to the present invention includes the humidifying water reservoir 13 for the anode, the humidifying water reservoir 14 for the cathode, and the water supply device 30, other configurations and the like are appropriately modified. Is possible.

  For example, FIG. 2 is a schematic configuration diagram of a fuel cell system according to another embodiment. The fuel cell system S2 (S) of this other embodiment includes a fuel cell power generation device 10B (10), a water supply device 30B (30), and a control means Z that controls the operation of each device 10B, 30B. In the present embodiment, the fuel cell 12 is provided with a cooling unit 12d capable of cooling a cell formed by sandwiching the electrolyte 12c between the anode 12a and the cathode 12b. That is, a cell stack is formed in which a plurality of cells formed by sandwiching the electrolyte 12c and the cooling unit 12d are stacked between the anode 12a and the cathode 12b.

  A portion of the water stored in the cathode humidified water storage section 14 is supplied to the cooling section 12d through the cooling water circulation path 20 while being energized by the cooling water pump 21. The water discharged from the cooling unit 12d reaches the anode humidified water storage unit 13 through the cooling water circulation path 20, and exchanges heat with the water stored in the anode humidified water storage unit 13. However, the water flowing through the cooling water circulation path 20 and the water stored in the humidifying water storage section 13 for anode are not mixed by merely exchanging heat. The water after the heat exchange in the anode humidified water storage unit 13 returns to the cathode humidified water storage unit 14 through the cooling water circulation path 20 and is mixed with the water stored in the cathode humidified water storage unit 14. Thus, the cooling water circulation path 20 through which the water stored in the cathode humidifying water storage unit 14 circulates as the cooling water is the cathode humidifying water storing unit 14 to the cooling unit 12d and the anode humidifying water storing unit 13 in order. A flow path that passes back to the cathode humidified water reservoir 14 is formed. As a result, the heat recovered by the cooling unit 12d of the fuel cell 12 is transferred to the water stored in the anode humidified water storage unit 13 and used to increase the temperature of the water stored in the anode humidified water storage unit 13. Is done.

  As described above, the fuel cell system S2 of this another embodiment includes the device configuration that can cool the fuel cell 12 and the device configuration that can raise the temperature of the water stored in the humidifying water storage section 13 for the anode as described above. However, it is different from the fuel cell system S1 of the above-described embodiment, and other device configurations and operation modes are the same as those of the fuel cell system S1 of the above-described embodiment.

  In addition, the internal configuration of the fuel cell system S, the configuration of the water channel, the arrangement of the valves, and the like can be modified as appropriate. For example, the form of water supply from the water supply device 30 to the humidifying water reservoir for anode 13 and the humidifying water reservoir for cathode 14 (configuration of water supply path, form of water supply treatment, etc.), the humidifying water reservoir for anode 13 and The discharge form of the water from the humidifying water reservoir for cathode 14 (configuration of drainage channels, drainage treatment, etc.) can be modified as appropriate. Moreover, the structure of the said circulation water channel 33 and the said ion exchange resin apparatus 31, and those presence or absence can be changed suitably. For example, unlike the configuration illustrated in FIG. 1 and FIG. 2, regarding the anode side (anode humidified water storage unit 13), a single unit connecting the water supply device 30 and the anode humidified water storage unit 13. This fuel cell system also has a structure in which water is supplied from the water supply device 30 to the anode humidified water storage unit 13 and drained from the anode humidification water storage unit 13 to the water supply device 30 in the dual water supply / drainage channel. The invention is available. Regarding the cathode side (cathode humidified water storage unit 14), the water supply device 30 and the cathode humidified water storage unit 14 supply water from the water supply device 30 to the cathode humidified water storage unit 14. The present invention can also be used in a fuel cell system having a configuration in which a drainage channel for draining water from the channel and the humidifying water reservoir for cathode 14 to the water supply device 30 is separately provided. Further, the fuel cell system may be configured such that the above-described single dual-purpose water supply / drainage channel is provided separately for the anode side and the cathode side, or the combination of the above-mentioned water supply channel / drainage channel is an anode. You may comprise the fuel cell system which was separately provided with respect to the side and the cathode side.

<2>
In the above embodiment, although the solenoid valve V is opened unexpectedly despite the valve closing operation, the state in which the solenoid valve V bites foreign matter is illustrated as an example. Depending on the cause, the solenoid valve V may open unexpectedly. For example, in the case of an electromagnetic valve that closes when the plunger moves away from the attractor, the plunger remains attached to the attractor, but the valve is opened despite the valve closing operation. Sometimes.

<3>
In the above embodiment, the control means Z determines several criteria for determining that a state in which the water level in the water reservoir T cannot be maintained within a predetermined range (that is, a state in which an abnormality has occurred in the water level in the water reservoir T) has been detected. Although illustrated, you may determine with the state which cannot maintain the water level in the water storage part T within the predetermined range based on another reference | standard. If an example is given, in the said embodiment, when the control means Z detects with the level sensor that the water level of the water storage part T became more than an upper limit water level, the state which abnormality occurred in the water level of the water storage part T However, the control means Z detects a state in which an abnormality has occurred in the water level of the water reservoir T when the state where the water level of the water reservoir T has reached the upper limit water level continues for a set time. It is also possible to modify such that it is determined that it has been done.

<4>
In the above embodiment, the electromagnetic valve V is cited as an example of the electric on-off valve. However, a motor valve that controls the opening degree of the valve body by the operation control of the stepping motor that drives the valve body is used as the on-off valve. May be. In this case as well, there may be a problem that foreign matter adheres to the surface of the valve body and the water channel cannot be closed despite the closing operation. Even when this problem occurs, the foreign matter can be discharged by performing the opening operation of the motor valve (or alternately repeating the opening operation and the closing operation) in the same manner as described above.

  INDUSTRIAL APPLICABILITY The present invention can be used in a fuel cell system including a water supply device that can supply water from a supplementary water storage unit to a water storage unit that stores water used in a fuel cell.

10 (10A, 10B) Fuel cell power generator 12 Fuel cell 12a Anode 12b Cathode 13 Humidified water reservoir for anode (water reservoir (humidified water reservoir) T)
14 Humidified water storage part for cathode (Water storage part (humidified water storage part) T)
30 (30A, 30B) Water supply device 31 Ion exchange resin device 32 Replenishment water storage unit 33 Circulating water channel (water channel)
33a Water supply channel (water channel)
33b Drainage channel (water channel)
34 Water pump 35 Anode water supply channel (water channel)
36 Anode drainage channel (water channel)
37 Cathode water supply / drainage channel (water channel)
Z Control means S (S1, S2) Fuel cell system V Solenoid valve (open / close valve)
Va anode water supply solenoid valve (solenoid valve V, anode water supply on / off valve)
Vb Anode drainage solenoid valve (solenoid valve V, anode drainage open / close valve)
Vc Cathode water supply / drainage solenoid valve (Solenoid valve V, Cathode supply / drainage valve)

Claims (5)

A fuel cell power generator having a fuel cell composed of an anode and a cathode;
A humidifying water reservoir for anode for storing humidified water for humidifying the gas supplied to the anode;
A humidifying water reservoir for cathode that stores humidified water for humidifying the gas supplied to the cathode;
A water supply device for performing water level maintenance control for maintaining the water level in the humidified water reservoir for anode within a predetermined range for anode and maintaining the water level in the humidified water reservoir for cathode within a predetermined range for cathode;
Control means for controlling the operation of each device,
The water supply device is
A replenishment water storage section for storing water;
A circulation channel that continuously or intermittently circulates the water stored in the replenishment water storage unit so as to return to the replenishment water storage unit again after taking out the water stored outside by a water pump;
An anode water supply channel used when supplying water to the anode humidified water storage unit from the replenishment water storage unit via the circulation channel;
An anode drainage channel used when draining from the anode humidified water reservoir to the replenishment water reservoir;
When supplying water from the replenishment water reservoir to the humidifying water reservoir for cathode via the circulating water channel and when draining from the humidifying water reservoir for cathode to the replenishing water reservoir via the circulating water channel Cathode water supply / drainage,
An anode water supply on / off valve capable of opening and closing the anode water supply path;
An anode drainage on-off valve capable of opening and closing the anode drainage channel;
A cathode water supply / drainage on / off valve capable of opening and closing the cathode water supply / drainage channel,
The control means includes
When a state in which a first abnormal state in which one or both of the humidified water reservoir for anode and the humidified water reservoir for cathode is equal to or higher than the upper limit water level of the predetermined range is detected is detected, Continue the power generation operation of the fuel cell while performing wastewater treatment at the time of abnormality from the humidified water storage part where the abnormality occurred ,
When a state in which a second abnormal state in which one or both of the water levels of the anode humidified water reservoir and the cathode humidified water reservoir are less than the lower limit water level of the predetermined range is detected is detected, Continue the power generation operation of the fuel cell while performing an abnormal water supply process to the humidified water storage section where the abnormality has occurred,
When an abnormal state is detected in which the water level of the humidified water reservoir for anode is equal to or higher than the upper limit water level of the predetermined range for anode and the water level of the humidified water reservoir for cathode is less than the lower limit water level of the predetermined range for cathode. Anode-side drainage for closing the anode water supply on / off valve, opening the anode drainage on / off valve, and closing the cathode water supply / drainage on / off valve with the water pump stopped Performing the processing, stopping the power generation operation of the fuel cell,
When an abnormal state is detected in which the water level of the humidifying water reservoir for anode is less than the lower limit water level of the predetermined range for anode and the water level of the humidifying water reservoir for cathode is equal to or higher than the upper limit water level of the predetermined range for cathode. Cathode drainage for closing the anode water supply on / off valve, closing the anode drain on / off valve, and opening the cathode water supply / drain on / off valve with the water pump stopped A fuel cell system that performs processing and stops the power generation operation of the fuel cell. Before Symbol control means,
When the water level of the anode humidified water storage unit is detected to be equal to or higher than the upper limit water level of the predetermined range for the anode as the first abnormal state, the water supply for the anode is stopped. The on-off valve is closed, and the anode drain on-off valve is opened.
When the state where the water level of the humidifying water storage section for the cathode is equal to or higher than the upper limit water level of the predetermined range for the cathode is detected as the first abnormal state, the water supply / drainage for the cathode is stopped in a state where the water pump is stopped The fuel cell system according to claim 1, wherein the abnormality drainage treatment is performed to open the on-off valve. The control means includes
The water pump is stopped when it is detected that the water level of both the anode humidified water reservoir and the cathode humidified water reservoir is equal to or higher than the upper limit water level of the predetermined range as the first abnormal state. 3. The abnormal drainage treatment is performed in which the anode water supply on / off valve is closed, the anode drainage on / off valve is opened, and the cathode water supply on / off valve is opened. The fuel cell system described. The control means includes
When the water level of the humidified water reservoir for anode is less than the lower limit water level of the predetermined range for anode as the second abnormal state, the water supply for anode is operated in the state where the water pump is operated. Opening the on-off valve, and performing the abnormal time water supply treatment to close the anode drain on-off valve,
When it is detected that the water level in the cathode humidified water reservoir is less than the lower limit water level of the predetermined range for the cathode as the second abnormal state, the water supply / drainage for the cathode is operated in the state where the water pump is operated. Perform the abnormal water supply treatment to open the on-off valve,
When the state in which the water levels of both the anode humidified water reservoir and the cathode humidified water reservoir are below the lower limit water level of the predetermined range is detected as the second abnormal state, the water pump is operated. 2. The abnormal-time water supply treatment is performed in which the anode water supply on / off valve is opened, the anode drainage on / off valve is closed, and the cathode water supply on / off valve is opened. The fuel cell system according to any one of to 3. The fuel cell system according to any one of claims 1 to 4, wherein the water supply device includes an ion exchange resin device in the middle of the circulation water channel.

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