WO2019188294A1 - Fuel cell device, control device, and control program - Google Patents

Abstract

This fuel cell device is provided with: a first tank for storing water recovered from exhaust gas; a water level detection device for detecting the height of the water surface in the first tank; a control device for controlling the operations of a fuel cell and each auxiliary machine; and a water refilling device for refilling water into the first tank from the outside. The control device performs at least one of a first control and a second control when the water level in the first tank becomes a first predetermined water level or less, said first control performing control so that the amount of water recovered from the exhaust gas increases, said second control performing control so that the amount of water supplied to the fuel cell decreases. After the start of the control, if the water level in the first tank is not recovered after a first predetermined time has elapsed, the control device performs refill water control for refilling external water into the first tank by using the water refilling device.

Description

FUEL CELL DEVICE, CONTROL DEVICE, AND CONTROL PROGRAM

The present disclosure relates to a fuel cell device, a control device, and a control program.

A fuel cell module is known that includes a cell stack in which a plurality of fuel cells that can obtain electric power using a fuel gas that is a hydrogen-containing gas and air that is an oxygen-containing gas are stacked in a storage container. Various fuel cell devices have been proposed in which the fuel cell module and auxiliary equipment necessary for its operation are accommodated in a housing such as an outer case.

In such a fuel cell device, surplus fuel gas that has not been used for power generation is burned, and the exhaust gas after combustion is passed through a heat exchanger or the like to be cooled. At the time of this heat exchange, the condensed water produced by the condensation of water vapor contained in the exhaust gas is purified by an ion exchange resin or the like and stored in a water tank such as a reforming water tank. And so-called water self-sustained operation is performed in which the stored water is supplied as reformed water to a reformer that steam reforms raw fuel such as natural gas.

Regarding such operation and control of a fuel cell using reformed water, Patent Document 1 describes that when the amount of reformed water stored in a water tank is insufficient due to, for example, high outside air temperature, It is disclosed that the amount of reaction air supplied per unit time supplied to the cathode is reduced to increase the air utilization rate of the fuel cell. Thus, a fuel cell system is described that increases the amount of condensed water to be recovered, which is reformed water, and recovers the amount of stored water.

Further, in Patent Document 2, in a fuel cell device including a condensing unit that generates condensed water by heat exchange with low-temperature water that is a heat medium or a refrigerant, according to the amount of reformed water stored in a water tank, A fuel cell device is disclosed in which the amount of reforming water stored in a water tank is suppressed by controlling the amount of heat medium supplied to the heat exchanger.

JP 2008-234869 A JP 2012-1119086 A

The fuel cell device of the present disclosure includes a fuel cell, a first tank that stores water collected from exhaust gas discharged from the fuel cell, and supplies the fuel cell to the fuel cell, and a water surface height in the first tank. A water level detecting device for detecting the fuel, a control device for controlling the operation of the fuel cell and each auxiliary device associated with the fuel cell, and a water replenishing device for replenishing the first tank from the outside.
The controller is
When the water level in the first tank falls below a predetermined first predetermined water level,
First control for controlling the operation of each auxiliary machine so that the amount of water recovered from the exhaust gas increases, and so that the amount of water supplied from the first tank to the fuel cell decreases. Water recovery operation control for performing at least one of the second controls for controlling the operation of each auxiliary machine is executed.
The control device is configured such that a water level in the first tank measured by the water level detection device is equal to or lower than the first predetermined water level after a predetermined first predetermined time has elapsed since the start of the water recovery operation control. If it is, the water replenishment control for replenishing the first tank with a predetermined amount of external water by the water replenishing device is executed.

A control device of the present disclosure is a control device that controls a fuel cell device including a fuel cell,
First control for controlling the operation of each auxiliary device associated with the fuel cell so that the amount of water recovered from the exhaust gas discharged from the fuel cell increases, and water recovered from the exhaust gas discharged from the fuel cell A second control for controlling the operation of each auxiliary device associated with the fuel cell so that the amount of water supplied to the fuel cell from a first tank stored for supplying the fuel cell to the fuel cell decreases; Water replenishment control for replenishing the first tank with a predetermined amount of external water can be performed by a water replenishing device that replenishes the first tank with water from the outside.
The control device performs water recovery operation control for performing at least one of the first control and the second control when the water level in the first tank is equal to or lower than a predetermined first predetermined water level. Execute. After the water recovery operation control is executed and continued for a predetermined first predetermined time, when the water level in the first tank is equal to or lower than the first predetermined water level, the water replenishment control is executed.

Further, the control program of the present disclosure is provided in a control device that controls a fuel cell device including a fuel cell.
When the water level stored in the first tank for storing the water recovered from the exhaust gas discharged from the fuel cell is equal to or lower than a predetermined first predetermined water level, the water is recovered from the exhaust gas. A first water recovery operation control step for performing a first control for controlling the operation of each auxiliary device associated with the fuel cell so that the amount of water increases;
Each of the fuel cells is associated with the fuel cell so that the amount of water supplied from the first tank to the fuel cell is reduced when the water level in the first tank is equal to or lower than a predetermined first predetermined water level. A second water recovery operation control step for performing a second control for controlling the operation of the auxiliary machine;
After at least one of the first water recovery operation control step and the second water recovery operation control step continues for a predetermined first predetermined time, the water level in the first tank is changed to the first predetermined water level. In the following cases, a water replenishment control step of replenishing the first tank with a predetermined amount of external water is performed by a water replenishing device that replenishes the first tank with water from the outside.

On the other hand, a fuel cell device according to the present disclosure includes a fuel cell, a first tank that stores water collected from exhaust gas discharged from the fuel cell, and supplies water to the fuel cell, and a water surface in the first tank. A water level detection device for detecting the height; and a control device for controlling the operation of the fuel cell and the auxiliary devices attached to the fuel cell.
The controller controls the operation of each auxiliary device so that the amount of water recovered from the exhaust gas increases when the water level in the first tank is equal to or lower than a predetermined second predetermined water level. At least one of a first control to be controlled and a second control to control the operation of each auxiliary device is performed so that the amount of water supplied from the first tank to the fuel cell is reduced. Execute water recovery operation control.
The control device is configured such that a water level in the first tank measured by the water level detection device is less than or equal to the second predetermined water level after a predetermined third predetermined time has elapsed since the start of the water recovery operation control. In some cases, control for stopping the power generation operation of the fuel cell device is executed.

Further, a control device of the present disclosure corresponding to the fuel cell device described above is a control device that controls a fuel cell device including a fuel cell,
First control for controlling the operation of each auxiliary device associated with the fuel cell so that the amount of water recovered from the exhaust gas discharged from the fuel cell increases, and water recovered from the exhaust gas discharged from the fuel cell A second control for controlling the operation of each auxiliary device associated with the fuel cell so that the amount of water supplied to the fuel cell from the first tank stored for supplying the fuel cell to the fuel cell is reduced. It is feasible.
The control device performs water recovery operation control that performs at least one of the first control and the second control when the water level in the first tank is equal to or lower than a predetermined second predetermined water level. When the water level in the first tank is equal to or lower than the second predetermined water level after the water recovery operation control is executed and continued for a predetermined third predetermined time, the power generation operation of the fuel cell device is performed. The control to stop is executed.

Furthermore, a control program of the present disclosure corresponding to the fuel cell device described above is provided in a control device that controls a fuel cell device including a fuel cell.
When the water level in the first tank for storing the water recovered from the exhaust gas discharged from the fuel cell is less than or equal to a predetermined second predetermined water level, the water is recovered from the exhaust gas. A first water recovery operation control step for performing a first control for controlling the operation of each auxiliary device associated with the fuel cell so that the amount of water increases;
Each of the fuel cells is associated with the fuel cell so that the amount of water supplied from the first tank to the fuel cell is reduced when the water level in the first tank is equal to or lower than a predetermined second predetermined water level. A second water recovery operation control step for performing a second control for controlling the operation of the auxiliary machine;
After at least one of the first water recovery operation control step and the second water recovery operation control step continues for a predetermined third predetermined time, the water level in the first tank is set to the second predetermined water level. When it is below, a power generation operation stop step for stopping the power generation operation of the fuel cell device is executed.

Objects, features and advantages of the present disclosure will become more apparent from the following detailed description and drawings.
It is a schematic block diagram of the fuel cell apparatus of embodiment. It is explanatory drawing of the periphery of the reforming water tank of a fuel cell apparatus which expanded F part of FIG. 1 is an external perspective view of a fuel cell device. It is a flowchart of the water collection | recovery driving | operation control and the supplementary water control in the fuel cell apparatus of 1st Embodiment. It is an example of the flowchart of the driving | operation restart control in the fuel cell apparatus of 1st Embodiment, and is a figure which shows the flow of 1st driving | operation restart control. It is another example of the flowchart of operation resumption control in the fuel cell device of a 1st embodiment, and is a figure showing the flow of the 2nd operation resumption control. It is a flowchart of the water collection | recovery driving | operation control in the fuel cell apparatus of 2nd Embodiment. It is an example of the flowchart of the operation resumption control in the fuel cell apparatus of 2nd Embodiment, and is a figure which shows the flow of 1st operation resumption control. It is an example of the flowchart of the operation resumption control in the fuel cell apparatus of 2nd Embodiment, and is a figure which shows the flow of 2nd operation resumption control. It is another example of the flowchart of the driving | operation restart control in the fuel cell apparatus of 2nd Embodiment, and is a figure which shows the flow of heat-medium cooling control and starting preparation control.

Hereinafter, the fuel cell device of the embodiment will be described with reference to the drawings.
1, 2 and 3 are diagrams for explaining the schematic configuration of the fuel cell device according to the embodiment. FIG. 2 is a schematic configuration around the reforming water tank, showing the F section of FIG. 1 in an enlarged manner.

The fuel cell device 100 according to the embodiment includes power supply by operation of a fuel cell module 1 that generates power using raw fuel such as natural gas and LP gas and air, a heat exchanger 3, a radiator 4, and a heat medium circulation. Hot water is supplied using an exhaust heat recovery system (also referred to as a heat cycle HS) including a pump P2 and a heat storage tank 5 or the like. In addition, said heat storage tank 5 is corresponded to the 2nd tank of this indication. Moreover, it can also be set as a so-called monogeneration system which does not supply hot water.

The fuel cell device 100 includes a reformed water tank 6, a power conditioner 20, a control device 30, a storage device 40, and the like as auxiliary devices in addition to the fuel cell module 1 described above. Further, the fuel cell device 100 includes a reforming water channel R including a reforming water pump P1, a drain channel D, and various sensors. As the sensors, a water detector WL ₁ located at a middle water level, which is a water level detection device, a water detector WL ₂ located at a low water level, a water temperature meter TS _{1 as} a heat medium temperature measuring device, and reformed water An electrical conductivity meter WC ₁ or the like that is a water quality measuring device for measuring water quality.

The fuel cell module 1 is accommodated in a storage container 10. A cell stack 11 in which a plurality of fuel cells are stacked, a reformer 12 that performs steam reforming of raw fuel using steam, and an ignition heater (not shown) for igniting surplus fuel gas And an exhaust gas catalyst filled in the catalyst container 2. As shown in FIG. 3, the fuel cell module 1 is disposed in a case 50 including each frame 51 and an exterior panel (not shown).

Although not shown in FIG. 3, a gas pump B1 for feeding raw fuel such as natural gas to the reformer, as illustrated in FIG. Air blower B2 fed to the stack, reforming water pump P1 for supplying reforming water in the reforming water tank 6 to the reformer 12 as raw water for steam reforming, surplus in the reforming water tank 6 A drainage channel D and the like for discharging water are disposed.

Further, in the case 50, the power conditioner 20 linked with the system power supply, the control device 30 including the control board for controlling the entire device, the storage device 40, etc., and the operation of the fuel cell as described above are controlled. Various sensors used for this purpose are also arranged.

In the fuel cell device 100 configured as described above, the heat exchanger 3 disposed adjacent to the fuel cell module 1, the exhaust gas discharged from the fuel cell module 1, water flowing in the heat exchanger 3, etc. Heat exchange is performed with the heat medium or refrigerant, and moisture contained in the exhaust gas is condensed to produce condensed water.

The generated condensed water is separated by a gas-liquid separator or the like and introduced into the reformed water tank 6 that collects and stores the condensed water via the condensed water channel C. The reforming water tank 6 corresponds to the first tank of the present disclosure.

The exhaust gas from which moisture has been removed is exhausted outside the fuel cell device via the exhaust gas flow path E. Further, the reformed water stored in the reformed water tank 6 is supplied to the reformer 12 in the fuel cell module 1 via the reformed water flow path R and the reformed water pump P1, and uses the reformed water. Used for steam reforming of raw fuel.

FIG. 2 is an enlarged view of a portion related to the power generation operation of the fuel cell and the reformed water used in the fuel cell device 100, that is, the inside of the two-dot chain line F in FIG.

The reformed water tank 6 that purifies and stores the condensed water is composed of a first reformed water tank 61 for purification treatment and a second reformed water tank 62 for storage. The first reforming water tank 61 and the second reforming water tank 62 are connected by a lower water pipe 65 to communicate with each other.

A reforming water outlet 62a connected to the suction port of the reforming water pump P1 is provided at the bottom or bottom of the second reforming water tank 62 that stores the generated reforming water. An excess water outlet 62 b connected to the drainage channel D is provided on the upper side surface of the second reformed water tank 62.

At the bottom of the second reforming water tank 62, water on a water level of the pooled reforming water, water detectors WL ₂ for detecting that has reached the empty water level is the lower limit water level is arranged . In addition, the black circle of each sensor in a figure shows the arrangement | positioning position of a sensor, or the detection position of tips, such as a probe.

The first reformed water tank 61 that collects and purifies condensed water to produce reformed water is filled with an ion exchange resin for purifying the condensed water collected from the heat exchanger 3. 1 ion exchange resin container 63 and a second ion exchange resin container filled with an ion exchange resin for purifying tap water or the like (hereinafter referred to as external water) replenished from the outside when the reforming water is insufficient 64 is disposed.

At a predetermined intermediate position of the first reforming water tank 61, a water detector WL that detects that the upper water surface, which is the water level of the stored reforming water, has reached the intermediate water level, which is a predetermined set water level. ₁ is disposed. As shown in FIG. 2, a second electrical conductivity meter WC ₂ for measuring the conductivity (unit: μS / cm) of the reformed water that is the stored water is arranged in the first reformed water tank 61. You may set up.

In the fuel cell device 100 of the present embodiment, as shown in FIG. 2, as a water supply device for supplying water to the water tank from the outside, a reformed water tank 6 and a waterworks (Waterworks) that is an external water source. between the like, water refilling channel G containing water stop valve V ₁ of the solenoid-operated is provided.

The end, which is the downstream end of the water supply channel G, is connected to an external water receiving port 61 a provided at the lower part of the first reformed water tank 61. The external water that has flowed in from the external water receiving port 61a is supplied from the external water introducing port 64a provided at the bottom of the second ion exchange resin container 64 through the extension pipe 61b provided inside the tank. It is introduced into the reformed water tank 61.

The second ion exchange resin container 64 is filled with an ion exchange resin for external water purification. While the external water passes through the ion exchange resin layer, impurities contained in tap water and the like are removed, and deionized water having a conductivity of about 1 μS / cm, that is, supplementary water for reformed water is purified. ing.

In addition, the electric conductivity meter WC ₁ in the figure is an example of a breakthrough determination device that determines whether or not the above-described ion exchange resin has broken through. This electric conductivity meter WC ₁ is disposed on the upper part of the second ion exchange resin container 64 where the replenishment water stays so that the conductivity of the replenishment water which is deionized water after the purification treatment can be measured. Yes.

The purified replenishing water flows out from the purified water outlet 64b provided on the upper side surface of the second ion exchange resin container 64, flows down to the water storage section in the first reformed water tank 61, and reformed water. As stored.

In the fuel cell device 100 of the present embodiment, when the reformed water in the reformed water tank 6 is insufficient, external water such as the tap water described above is purified through ion exchange resin or the like, and then used as supplementary water. It is introduced into the reformed water tank 6. The conditions and control for rehydration will be described later.

The fuel cell device 100 includes a control device 30 that includes at least one processor to provide control and processing capabilities for performing various functions, as will be described in detail below.

According to various embodiments, the at least one processor may be implemented as a single integrated circuit or as a plurality of communicatively connected integrated circuits and / or discrete circuits. The at least one processor can be implemented according to various known techniques.

In one embodiment, the processor includes one or more circuits or units configured to perform one or more data computation procedures or processes, for example, by executing instructions stored in associated memory. In other embodiments, the processor may be firmware, such as a discrete logic component, configured to perform one or more data computation procedures or processes.

According to various embodiments, the processor may include one or more processors, controllers, microprocessors, microcontrollers, application specific integrated circuits, digital signal processors, programmable logic devices, field programmable gate arrays, or these devices or The functions described below may be performed, including any combination of configurations, or other known device and configuration combinations.

The control device 30 includes a storage device 40, a power conditioner 20, a fuel cell module 1, a raw fuel supply device such as a gas pump B1, an oxygen-containing gas supply device such as an air blower B2, and a reforming water pump P1. water supply device, the water supply device, such as a water replenishment passage G containing Tomesuiben V _1, and, the medium-level water detector WL _1, the water level detector, such as a water detector WL ₂ low water level, water temperature gauge It is connected to various sensors such as a heat medium temperature measuring device such as TS _{1 and} a water quality measuring device such as electric conductivity meter WC ₁ , and controls and manages the entire fuel cell device 100 including these functional units. The control device 30 obtains a program stored in the storage device 40 and executes this program, thereby realizing various functions related to each part of the fuel cell device 100.

When transmitting a control signal or various types of information from the control device 30 to another function unit or device, the control device 30 and the other function unit may be connected by wire or wireless. Control characteristic of this embodiment performed by the control device 30 will be described later. In the present embodiment, the control device 30 particularly controls replenishment of the external water described above to the reforming water storage unit. Moreover, in each figure, illustration of the connection line which connects the control apparatus 30 and the memory | storage device 40, each apparatus and each sensor which comprise a fuel cell may be abbreviate | omitted.

The storage device 40 can store programs and data. The storage device 40 may also be used as a work area for temporarily storing processing results. The storage device 40 includes a recording medium. The recording medium may include any non-transitory storage medium such as a semiconductor storage medium and a magnetic storage medium. The storage device 40 may include a plurality of types of storage media. The storage device 40 may include a combination of a portable storage medium such as a memory card, an optical disk, or a magneto-optical disk, and a storage reading device. The storage device 40 may include a storage device used as a temporary storage area such as a RAM (Random Access Memory).

Next, water recovery operation control for recovering the amount of reformed water and supplemental water control when the reformed water is insufficient by the fuel cell device having the above-described configuration are performed as follows. The following description will be made based on the flowcharts of FIGS. 4, 5A, and 5B. Each step in the flowchart is abbreviated as “S”. For example, Step 1, Step 2... Are referred to as [S1], [S2]. The same notation is used in the figure.

The control device 30 in the fuel cell device according to the first embodiment shown in FIGS. 4, 5 </ b> A, and 5 </ b> B is used for the reforming water tank 6, which is the first tank, at normal or normal time when no abnormality is detected in the system. until the water detection signal of water detectors WL ₁ disposed in a predetermined intermediate position is transmitting is interrupted, i.e., be received water detection signal from the water detector WL ₁ of the water level in the first is a predetermined water level Until there is no more, the system waits while repeating the loop of [S1] for determining whether or not the water detection signal is received, that is, the left side of the flowchart of FIG. 4 in [S1].

Here, the loop in the [S1], when water detection signal of water detectors WL ₁ of medium water level to send is not received, the control unit 30 starts the following water recovery operation control [S2] .

Water recovery operation control is performed for the purpose of recovering the amount of reformed water in the reformed water tank 6. In [S2] and thereafter, the control suppresses the power generation output of the fuel cell and also controls other auxiliary machines to continue the power generation operation of the fuel cell.

Specifically, at least one of the first control for increasing the amount of water recovered from the exhaust gas and the second control for reducing the amount of water supplied from the reforming water tank 6 to the fuel cell module 1. Control.

In addition to suppressing the power generation output of the fuel cell as described above, the first control, for example, maximizes the water flow rate, which is the delivery amount of the heat medium HS heat medium circulation pump P2, and the fan of the radiator 4 The operation duty ratio of the pump and fan of the heat medium circulation system is increased, for example, by raising the rotation of the motor to the rated maximum speed.

In order to increase the oxygen utilization rate by lowering the fuel utilization rate, the gas flow rate that is the delivery amount of the gas pump B1 that feeds raw fuel to the reformer and the delivery of the air blower B2 that delivers air to the cell stack Control to increase the operating duty ratio of the pump and blower of the raw material supply system, such as controlling the air flow rate that is a quantity. As a result, the condensed water can be recovered with maximum efficiency.

The second control is, for example, a control for reducing as much as possible the amount of reformed water delivered by the reformed water pump P1, which is a device for supplying water to the fuel cell module 1.

In addition, the water recovery operation control described in [S2] and thereafter is performed by performing at least one of the first control and the second control at the same time, if possible, simultaneously, so that the condensate water is maximally efficient. Can be recovered.

The duration of the water recovery operation control, the control device 30, the water detector WL ₂ of low water position is drought position of the reforming water tank 6 confirms whether or not the outgoing water detection signal S3! . If, in (S3), and if the water detection signal from the water detector WL ₂ low level position Todaere, water amount of the reforming water reforming water tank 6 is reduced to a dangerous level determination Then, the control shifts to the control for stopping the power generation operation (see the drought alert in [S12]). In addition, when the drought alert is issued and the power generation operation is stopped [S12], the operation can be resumed through maintenance by human hands.

Next, the control apparatus 30 confirms the recovery | restoration degree of the water level of stored reforming water in [S4]. That is, in this case, the control unit 30, the water detection signal from the water detector WL ₁ is received, if it is confirmed that the water level of the reservoir reforming water is restored to the first predetermined level, in [S13], the aforementioned water The recovery operation control is terminated, and the state returns to the initial state before [S1] in which the rated power generation operation is possible.

On the other hand, in (S5), after the first predetermined time T1 has elapsed from the start of the water recovery operation control also, water detection signal from the water detector WL ₁ medium water level was not to be received, i.e. reservoir When the recovery of the water level of the reforming water is not sufficient, the control device 30 starts the water replenishment control [S7] for replenishing external water. The first predetermined time T1 indicates a predetermined period of, for example, about 3 hours.

Here, the control device 30 may execute breakthrough determination control for determining whether or not external water can be replenished before executing the water replenishment control [S7].

As a specific example of breakthrough determination control, the control device 30 determines whether or not the ion exchange resin for external water purification used for replenishment is “breakthrough”, that is, the replenishment ion exchange resin reaches the end of its life. It is detected and determined using an electric conductivity meter as a breakthrough determination device, in this example, a breakthrough detection device.

As an example, in the case of the fuel cell device 100 of the first embodiment, in the flow chart of FIG. 4, the ion exchange resin for replenishment is provided between the first predetermined time T1 [S5] and the start of replenishment control [S7]. Breakthrough determination control [S6] is performed to determine whether the breakthrough occurs.

Breakthrough determination control (S6), using an electric conductivity meter WC ₁ disposed on the upper portion of the second ion-exchange resin container 64, leaving the purification treated in the second ion-exchange resin container 64 It is confirmed whether or not the conductivity J of ionic water is a value equal to or lower than a predetermined conductivity J1 determined in advance.

Then, in the breakthrough determination control [S6], when the measured conductivity J is equal to or lower than the predetermined conductivity J1, that is, “No (Good)” that does not breakthrough, the control device 30 is for purifying external water. It is determined that the ion exchange resin has not reached the end of its life and is functioning normally, and replenishment water control [S7] described later is started or executed.

Further, in the breakthrough determination control [S6], when the measured conductivity J exceeds the predetermined conductivity J1, that is, the ion exchange resin for external water purification has reached the end of its life and is broken through “Yes (No If it is determined that “Good)”, the replenishment using the external water is stopped, and the fuel cell shifts from the power generation operation to the control for stopping the operation [standby state: S14]. In other words, the power generation operation is stopped before the amount of reformed water stored in the reforming water tank 6 is lowered to a dangerous level, in other words, before the power generation operation is stopped with a drought alert.

In the above example, the breakthrough determination control [S6] is performed using the conductivity J of the purified deionized water as a reference or determination item, but other measurement values may be used as the determination condition. it can. For example, when a flow meter that measures the amount of inflow per hour into the second ion exchange resin container 64 or tap water that is external water, or a water meter is provided, values obtained from these sensors, That is, the water amount is integrated, and the value of the accumulated water amount may be used as an index for determining breakthrough of the ion exchange resin for water replenishment.

Further, for example, the tap water is the external water, the inflow into the second ion-exchange resin container 64, the time and the water replenishment passage water stop valve V ₁ disposed in G is opened If the calculation can be performed based on the water pressure or flow rate of the external water flowing in the water supply passage G, the accumulated value obtained by integrating the valve opening time flows into the second ion exchange resin container 64. The accumulated water amount may be used for the determination of breakthrough of the ion exchange resin for water replenishment.

Next, in the above-described breakthrough determination control [S6] for determining breakthrough of the ion exchange resin for water replenishment, if it is determined “No” that there is no breakthrough, the external water is reformed water that is the first tank. “Replenishment control” [from S7 to S10] for replenishing the tank 6 is started.

Rehydration control, as shown in the flowchart of FIG. 4, first, as [S8], opened for external water introduction, the water stop valve V ₁ of the solenoid-operated disposed in the water supply passage G, external Tap water, which is water, is introduced into the second ion exchange resin container 64, and water replenishment is started. Hereinafter, external water is referred to as “tap water”.

Next, the tap water is supplemented while confirming the amount of the stored reformed water in the reformed water tank 6. That is, in [S9] of the flowchart, as described above, whether or not the amount of reformed water stored in the reforming water tank 6 has decreased to a dangerous drought level, whether or not the low water level position is set. while checking the water detection signal of the water detector WL _2, continues the rehydration of tap water.

If the water detection signal from the water detector WL ₂ at the low water level is interrupted during replenishment, the replenishment is interrupted as drought or some abnormality has occurred, and the power generation operation is stopped along with the drought alert. [S15]. In addition, when the power generation operation is stopped at the same time that the drought alert is issued [S15], the operation can be resumed through manual maintenance.

Then, in [S10] of the flow chart, the control unit 30, when possible to receive the water detection signal from the water detector WL ₁ of water level in a first predetermined level, storage reforming the reforming water tank 6 it is determined that the amount of water quality water has been restored, close the Tomesuiben V _1, to stop the introduction of tap water [S11]. And the above-mentioned water replenishment control and the water collection | recovery driving | operation control which performed power generation output suppression etc. are complete | finished, and it returns to [S1] which is a steady operation.

As described above, the fuel cell device 100 according to the present embodiment uses the external water when the amount of reforming water is insufficient and the water recovery operation control is performed for a certain period of time. By replenishing water, power generation operation can be continued.

That is, in the fuel cell device having the conventional configuration, if water necessary for the power generation operation cannot be secured even if the water amount recovery operation or control of the reforming water is performed, the device is forcibly stopped, and maintenance by human hands is not possible. There were many cases where operation could not be resumed until completion.

The fuel cell device, the control device, and the control program according to the present embodiment avoid the stoppage of the device with maintenance even when the water amount recovery operation or control of the reforming water is performed or when the water necessary for the power generation operation cannot be secured. The Thereby, efficient power generation operation can be continued.

In addition, by performing water recovery operation control before replenishing water, the number of times of replenishing external water can be reduced as much as possible, the deterioration of the function of the ion exchange resin for external water purification can be suppressed, and the life of the ion exchange resin can be extended. it can.

Next, as illustrated in the flowchart of FIG. 4 described above, when the water replacement cannot be performed due to breakthrough of the ion exchange resin for water replenishment and the power generation operation of the fuel cell device is stopped, that is, from [S6] to [S14 in the flowchart. , The fuel cell device in the operation standby state has a first power generation restart control flow shown in FIG. 5A described later or a second power generation restart control flow shown in FIG. 5B. It is programmed or controlled to automatically resume power generation operation.

More specifically, as an example, when the flow shown in FIG. 5A is applied, the fuel cell device that is in a standby state is first in [S20], during a period T2 that is a predetermined second predetermined time. Wait while the power generation operation of the fuel cell is stopped. The second predetermined time T2 is a predetermined period, for example, about one day.

When the above-described standby period T2 ends, the control device 30 starts the first operation resumption control [S21-1]. In [S22-1], the first operation resumption control [S21-1] is based on the current time based on the standard time of the location where the fuel cell device is installed, such as the Japanese standard time, from an external time server via a built-in clock or communication line The time, so-called local time, is acquired, and the first predetermined time set in advance in a time zone in which the outside temperature is estimated to be relatively low, such as 2:00 am or 3:00 am at midnight, The fuel cell device is executed when it reaches for the first time after the end of the waiting period T2, and the fuel cell device shifts from the standby state to the startup preparation control for resuming the power generation operation.

On the other hand, when the flow of the second operation resumption control shown in FIG. 5B is applied, the fuel cell device in the standby state is first determined in advance in [S20] as in the first operation resumption control of FIG. 5A. During the period T2, which is the second predetermined time, the fuel cell is stopped while the power generation operation is stopped.

Next, when the standby period T2 ends, the control device 30 starts the second operation resumption control [S21-2]. Second operation restart control [S21-2], in [S22-2], a second tank, confirms the temperature of the heat storage tank 5 is disposed a water thermometer TS ₁ of the heat cycle HS system, its If the water temperature is equal to or lower than a first predetermined temperature M1 determined in advance, the fuel cell device shifts from the standby state described above to start-up preparation control for resuming the power generation operation.

The start preparation control is a mode in which preparation for resuming the power generation operation is performed, and for example, the air blower B2 that sends air into the fuel cell module is started. Further, the standby [S20] with the power generation operation stopped during the period T2 which is the second predetermined time can be omitted. That is, after stopping the power generation operation in [S14], the first operation resumption control (refer to the flow chart 5A) or the second operation resumption control (refer to the flow chart 5B) may be executed immediately.

The first predetermined temperature M1 is 47 ° C., for example. Moreover, in this embodiment, when the measured water temperature M exceeds 47 degreeC, the control apparatus 30 may perform the heat medium cooling control for reducing the temperature of the heat medium in the thermal storage tank 5. FIG.

With the heat medium cooling control, for example, the temperature of the heat medium in the heat storage tank 5 is lowered between the stop of the power generation operation and the start of the preparation preparation control, and the amount of condensed water recovered increases after the power generation operation is restarted. Control to prepare. The heat medium can be cooled by operating a cooling device. As an example of the cooling device, there is a heat medium HS-based heat medium circulation pump P <b> 2 and a radiator 4. For example, the heat cycle HS heat medium circulation pump P2 may be operated and the radiator 4 may be controlled to operate.

Further, the heat medium cooling control may be executed between the stop of the power generation operation and the start of the start preparation control. As shown in the flow chart 5A, after the first predetermined time has passed [S22-1], before the power generation operation is restarted [S23], the heat medium cooling control is started and the heat medium cooling control is performed for a predetermined time. It may be continued or until the heat medium becomes the first predetermined temperature or lower. Further, as shown in the flow chart 5B, after the second operation resumption control [S21-2] is started, the heat medium cooling control is started and continued until the heat medium becomes equal to or lower than the first predetermined temperature [S22-2]. May be.

With the above control, the fuel cell device 100 according to the present embodiment can restart operation after stopping the operation before the drought alert is issued and recovering the water level even when water replenishment is not possible. Can do.

That is, the fuel cell device 100 can restart the power generation operation without performing manual maintenance even if the water amount recovery operation or control of the reforming water is performed or water necessary for the power generation operation cannot be secured. Can do. As a result, the power generation operation can be performed efficiently.

It should be noted that the control device 30 and the storage device 40 of the fuel cell device 100 can also be realized as a configuration provided outside the fuel cell device 100. Further, it can be realized as a control method including a characteristic control process in the control device 30 according to the present disclosure, or can be realized as a control program for causing a computer to execute the above process.

In addition, the cell stack device and the fuel cell module are not limited to the SOFC. For example, the polymer electrolyte fuel cell [Polymer Electrolyte Fuel Cell (PEFC)], the phosphoric acid fuel cell [Phosphoric Acid Fuel Cell (PAFC)], and Alternatively, a fuel cell such as a molten carbonate fuel cell (Molten Carbonate Fuel Cell (MCFC)) may be used.

Next, control of the fuel cell device according to the second embodiment shown in FIGS. 6 and 7A, 7B, and 7C will be described. Note that the configuration of the fuel cell device of the second embodiment is the same as that of the first embodiment described above, and therefore, detailed description regarding the configuration, reference numerals, and the like is omitted unless particularly required.

The fuel cell device, control device, and control program of the second embodiment are different from the first embodiment in that the water recovery operation is performed for the purpose of recovering the amount of reformed water in the reformed water tank, which is the first tank. If it is not possible to recover the amount of reforming water necessary for continuing power generation operation even after control, the purified external water is not replenished as reformed water, and the power generation operation of the fuel cell device is stopped. It is a point to do.

Therefore, the external water receiving port 61a, the extended pipe 61b, and external water introduction, which are necessary as the water supply device for supplying water to the water tank from the outside, are necessary in the fuel cell device of the first embodiment. mouth 64a, and the water refilling channel G containing Tomesuiben V ₁ etc., the second ion-exchange resin container 64, and the electrical conductivity meter WC ₁ disposed in a second ion-exchange resin container 64, The fuel cell device according to the second embodiment is not an essential configuration.

The control of the fuel cell device according to the second embodiment will be described in detail.
In the fuel cell device of the second embodiment as well, as shown in the flowchart of FIG. 6, the control device 30 controls the predetermined amount of the reforming water tank 6 that is the first tank during normal or normal time when no abnormality is detected in the system. of monitors water detection signal from the water detector WL ₁ disposed in the intermediate position, when it is interrupted, to start water recovery operation control [S2].

As in the first embodiment, the water recovery operation control [S2] includes the first control for increasing the amount of water recovered from the exhaust gas, and the amount of water supplied from the reforming water tank 6 to the fuel cell module 1. At least one of the second controls to be reduced is performed. In addition, since the content of 1st control and 2nd control is the same as 1st Embodiment, description is abbreviate | omitted.

The water recovery operation control [S2] can recover condensed water with maximum efficiency by simultaneously performing at least one of the first control and the second control, if possible. The possible points are similar.

Also, the duration of the water recovery operation control [S2], the control unit 30, in the (S3), interrupted water detection signal from the water detector WL ₂ of low water position is drought position of the reforming water tank 6 If it does, it will transfer to the control which stops an electric power generation driving | operation (refer the drought alert of [S12]).

Further, in (S4), if the water detector WL ₁ is located in the middle level received water detection signal, in [S13], to exit the water recovery operation control described above, in which can be rated generating operating state [S1] The same is true for returning to the initial state. Furthermore, as in the first embodiment, when a drought alert is issued and the power generation operation is stopped [S12], the operation can be resumed through manual maintenance thereafter.

Then, in the (S5), after the third predetermined time T3 has elapsed from the start of the water recovery operation control also, water detection signal from the water detector WL ₁ medium water level was not to be received, i.e. reservoir When recovery of the water level of the reforming water is not sufficient, the control device 30 shifts to control for stopping the power generation operation [S30]. In this case, since there is water above the low water level, which is the drought position of the reformed water tank 6, the power generation operation is stopped without a drought alert.

Next, as described above, when the power generation operation of the fuel cell device is stopped because the water level of the reformed water is not sufficiently recovered even if the water recovery operation control is performed, the fuel of the second embodiment in the standby state is stopped. As the next step, the battery device is programmed or controlled so as to automatically aim at resuming the power generation operation in the flow shown in FIG. 7A, FIG. 7B or FIG. 7C described later.

More specifically, as an example, when the flow shown in FIG. 7A is applied, in [S40], the fuel cell device that is in a standby state is first set to a predetermined fourth predetermined time period T4. Then, the fuel cell is on standby while the power generation operation of the fuel cell is stopped. The fourth predetermined time T4 is a predetermined period, for example, about one day.

When the above-described waiting period T4 ends, the control device 30 starts the first operation resumption control [S41-1]. As in the first embodiment, the first operation resumption control [S41-1] is the same as that of the first embodiment. In [S42-1], the fuel cell device such as a Japanese standard time is received from an external time server via a built-in clock or communication line. The current time based on the standard time of the installation location, so-called local time, is acquired, and the current time is preset in a time zone in which the outside air temperature is estimated to be relatively low, such as midnight or 3:00, for example, at midnight. The second predetermined time is executed at the first time after the end of the waiting period T4, and the fuel cell device shifts from the standby state to the start-up preparation control for resuming the power generation operation.

The control device 30 may perform heat medium cooling control for reducing the temperature of the heat medium in the heat storage tank 5. As in the first embodiment, after the second predetermined time has passed [S42-1], the above-described heat medium cooling control is started before the start preparation control [S43] for restarting the power generation operation is started. Then, the heat medium cooling control may be continued for a predetermined time, or may be continued until the heat medium becomes a predetermined temperature or lower.

The start preparation control is a mode in which preparation for resuming the power generation operation is performed, and for example, the air blower B2 that sends air into the fuel cell module is started. Moreover, during the period T4 that is the fourth predetermined time, the standby [S40] with the power generation operation stopped can be omitted. That is, after the power generation operation is stopped in [S30], the first operation resumption control (see FIG. 7A) or the second operation resumption control (see FIG. 7B) may be executed immediately.

On the other hand, when the flow of the second operation resumption control shown in FIG. 7B is applied, the fuel cell device that is in the standby state is first set to a predetermined fourth predetermined value in [S40] as in the first embodiment. During the period T4, which is a time, the fuel cell is stopped while the power generation operation is stopped.

Next, when the standby period T4 ends, the control device 30 starts the second operation resumption control [S41-2]. Second operation restart control [S41-2], in [S42-2], a second tank, confirms the temperature of the heat storage tank 5 is disposed a water thermometer TS ₁ of the heat cycle HS system, its If the water temperature is equal to or lower than the predetermined second predetermined temperature M2, the fuel cell device shifts from the standby state described above to start-up preparation control for resuming the power generation operation. The second predetermined temperature M2 is 47 ° C., for example.

Next, as another example, when the flow shown in FIG. 7C is applied, as in the above example, the fuel cell device that is in the standby state is first set to a predetermined fourth predetermined time in [S40]. During a certain period T4, the power generation operation of the fuel cell is stopped and the apparatus is on standby.

Next, when the standby period T4 ends, the control device 30 applies the heat cycle HS heat storage tank 5 as the second tank in [S42-3] as in [S42-2] of the second operation resumption control. confirms the provided temperature of the water temperature gauge TS _1, if the water temperature is a second predetermined temperature M2 is less than or equal to a predetermined fuel cell apparatus from the standby state described above, for the resumption of the power generation operation The process proceeds to start preparation control [S44].

However, in the above [S42-3], when the temperature of the water thermometer TS ₁ which is disposed in the second tank exceeds the 47 ° C. a second predetermined temperature M2, control device 30, the following description After performing the heat medium cooling control [from S50 to S56] to lower the temperature of the heat medium in the heat storage tank 5, the process proceeds to start preparation control [S44]. Note that the heat medium cooling control [from S50 to S56] can be executed as a subroutine independent of other conditions.

When the heat medium cooling control [from S50 to S56] starts in [S50], first, as shown in the flowchart of FIG. 7C, in [S51], the heat medium HS heat medium circulation pump P2 is operated, and [ In S52], control for operating the fan of the radiator 4 is performed.

In [S53], the heat medium circulation pump P2 and the fan of the radiator 4 are operated during a period T5 which is a predetermined fifth predetermined time in which the temperature of the heat medium in the heat storage tank 5 is sufficiently lowered. After waiting, the fan of the radiator 4 is stopped [S54], the heat medium circulation pump P2 is stopped [S55], and the heat medium cooling control is ended [S56].

This heat medium cooling control [from S50 to S56] lowers the temperature of the heat medium in the heat storage tank 5 as much as possible, and prepares so that the recovered amount of condensed water increases after restarting the power generation operation described above.

With the above control, the fuel cell device 100 according to the second embodiment can be restarted after the operation is stopped and the water level can be recovered before the drought alert is issued. That is, the fuel cell device 100 can efficiently perform the power generation operation by resuming the power generation operation without maintenance.

Note that, similarly to the first embodiment, also in the second embodiment, the control device 30 and the storage device 40 of the fuel cell device 100 can be realized as a configuration provided outside the fuel cell device 100. Further, it can be realized as a control method including a characteristic control process in the control device 30 according to the present disclosure, or can be realized as a control program for causing a computer to execute the above process.

Further, the cell stack device and the fuel cell module are not limited to SOFC, and for example, a polymer electrolyte fuel cell (Polymer Electrolyte Fuel Cell (PEFC)), a phosphoric acid fuel cell (Phosphoric Acid Fuel Cell (PAFC)), and Alternatively, a fuel cell such as a molten carbonate fuel cell (Molten Carbonate Fuel Cell (MCFC)) may be used.

Furthermore, the present disclosure can be implemented in various other forms without departing from the spirit or main features thereof. Therefore, the above-described embodiments are merely examples in all respects, and the scope of the present disclosure is set forth in the claims, and is not limited to the text of the specification. Further, all modifications and changes belonging to the claims are within the scope of the present disclosure.

1 Fuel cell module 5 Thermal storage tank (second tank)
6 Reformed water tank (first tank)
61 First Reformed Water Tank 62 Second Reformed Water Tank 63 First Ion Exchange Resin Container 64 Second Ion Exchange Resin Container 30 Control Device 40 Storage Device 100 Fuel Cell Device

V ₁ Water stop valve G Water supply flow path R Reformed water flow path P1 Reformed water pump TS ₁ Water temperature gauge WC ₁ Electric conductivity meter WL ₁ Water detector (Medium water level sensor)
WL ₂ water detector (low water level sensor)

Claims (14)

1. A fuel cell;
   A first tank for storing water recovered from the exhaust gas discharged from the fuel cell to supply the fuel cell;
   A water level detection device for detecting the height of the water surface in the first tank;
   A control device for controlling the operation of the fuel cell and the auxiliary devices attached to the fuel cell;
   A water supply device for supplying water to the first tank from the outside,
   The controller is
   A first control for controlling the operation of each auxiliary device so that the amount of water recovered from the exhaust gas increases when the water level in the first tank is equal to or lower than a predetermined first predetermined water level. ,and,
   Of the second control for controlling the operation of each auxiliary device so that the amount of water supplied from the first tank to the fuel cell is reduced,
   Execute water recovery operation control to perform at least one control,
   After a predetermined first predetermined time has elapsed since the start of the water recovery operation control, when the water level in the first tank measured by the water level detection device is equal to or lower than the first predetermined water level, A fuel cell device that executes water replenishment control for replenishing a predetermined amount of external water to the first tank by a water replenishment device.
2. The water supply device is
   A water replenishment passage for allowing water replenished from the outside to flow through the first tank;
   An ion exchange resin located in the water supply channel;
   A breakthrough determination device for determining that the ion exchange resin has broken through,
   The control device performs breakthrough determination control to determine whether or not the ion exchange resin is broken by the breakthrough determination device before performing the water replenishment control,
   2. The fuel cell device according to claim 1, wherein, in the breakthrough determination control, when it is determined that the ion exchange resin does not breakthrough, the water replenishment control is executed.
3. 3. The fuel cell according to claim 2, wherein the control device executes control for stopping a power generation operation of the fuel cell device when it is determined in the breakthrough determination control that the ion exchange resin is broken. 4. apparatus.
4. A second tank for storing a heat medium that exchanges heat with the exhaust gas;
   A heat medium temperature measuring device for measuring the temperature of the heat medium in the second tank,
   The controller is
   A first operation resumption control for restarting the power generation operation of the fuel cell device when a predetermined first time is reached;
   A second operation resumption control for restarting the power generation operation of the fuel cell device when the heat medium temperature measured by the heat medium temperature measuring device is equal to or lower than a first predetermined temperature determined in advance.
   The said control apparatus performs the driving | operation restart control of any one among the said 1st driving | operation restart control and the said 2nd driving | running restart control after performing the control which stops the said electric power generation driving | operation. Fuel cell device.
5. The control device executes either one of the first operation resumption control and the second operation resumption control after waiting for a predetermined second predetermined time from the stop of the power generation operation. The fuel cell device according to claim 4.
6. A cooling device for cooling the heat medium in the second tank;
   The control device executes a start preparation control that is a preparation for performing a power generation operation of the fuel cell device, which is executed after the control for stopping the power generation operation and after the operation resumption control is executed. The fuel cell device according to claim 4 or 5, wherein heat medium cooling control for cooling the heat medium is executed before.
7. A control device for controlling a fuel cell device including a fuel cell,
   A first control for controlling the operation of each auxiliary device associated with the fuel cell so that the amount of water recovered from the exhaust gas discharged from the fuel cell increases;
   Each auxiliary device attached to the fuel cell so that the amount of water supplied to the fuel cell from the first tank that stores the water recovered from the exhaust gas discharged from the fuel cell is reduced. A second control for controlling the operation of
   Replenishment control for replenishing the first tank with a predetermined amount of external water by a water replenishing device for replenishing the first tank with water from the outside;
   Is possible and
   When the water level in the first tank is equal to or lower than a predetermined first predetermined water level, water recovery operation control is performed to perform at least one of the first control and the second control,
   A control device that executes the replenishment control when the water level in the first tank is equal to or lower than the first predetermined water level after the water recovery operation control is executed and continues for a predetermined first predetermined time.
8. In a control device for controlling a fuel cell device including a fuel cell,
   When the water level stored in the first tank for storing the water recovered from the exhaust gas discharged from the fuel cell is equal to or lower than a predetermined first predetermined water level, the water is recovered from the exhaust gas. A first water recovery operation control step for performing a first control for controlling the operation of each auxiliary device associated with the fuel cell so that the amount of water increases;
   Each of the fuel cells is associated with the fuel cell so that the amount of water supplied from the first tank to the fuel cell is reduced when the water level in the first tank is equal to or lower than a predetermined first predetermined water level. A second water recovery operation control step for performing a second control for controlling the operation of the auxiliary machine;
   After at least one of the first water recovery operation control step and the second water recovery operation control step continues for a predetermined first predetermined time, the water level in the first tank is changed to the first predetermined water level. A water replenishment control step of replenishing the first tank with a predetermined amount of external water by a water replenishing device that replenishes the first tank with water from the outside,
   A control program that executes
9. A fuel cell;
   A first tank for storing water recovered from the exhaust gas discharged from the fuel cell to supply the fuel cell;
   A water level detection device for detecting the height of the water surface in the first tank;
   A control device for controlling the operation of the fuel cell and the auxiliary devices attached to the fuel cell;
   With
   The controller is
   A first control for controlling the operation of each auxiliary device so that the amount of water recovered from the exhaust gas increases when the water level in the first tank is equal to or lower than a predetermined second predetermined water level. ,and,
   Of the second control for controlling the operation of each auxiliary device so that the amount of water supplied from the first tank to the fuel cell is reduced,
   Execute water recovery operation control to perform at least one control,
   When a predetermined third predetermined time has elapsed since the start of the water recovery operation control and the water level in the first tank measured by the water level detection device is equal to or lower than the second predetermined water level, a fuel cell A fuel cell device that executes control to stop the power generation operation of the device.
10. A second tank for storing a heat medium that exchanges heat with the exhaust gas;
    A heat medium temperature measuring device for measuring the temperature of the heat medium in the second tank,
    The controller is
    A first operation resumption control for restarting the power generation operation of the fuel cell device when a predetermined second time is reached;
    A second operation resumption control for restarting the power generation operation of the fuel cell device when the heat medium temperature measured by the heat medium temperature measuring device is equal to or lower than a predetermined second predetermined temperature;
    10. The control device according to claim 9, wherein the control device executes any one of the first operation resumption control and the second operation resumption control after executing the control for stopping the power generation operation. Fuel cell device.
11. The control device executes either one of the first operation resumption control and the second operation resumption control after waiting for a predetermined fourth predetermined time after the power generation operation is stopped. The fuel cell device according to claim 10.
12. A cooling device for cooling the heat medium in the second tank;
    The control device executes a start preparation control that is a preparation for performing a power generation operation of the fuel cell device, which is executed after the control for stopping the power generation operation and after the operation resumption control is executed. The fuel cell device according to claim 10 or 11, wherein heat medium cooling control for cooling the heat medium is executed before.
13. A control device for controlling a fuel cell device including a fuel cell,
    A first control for controlling the operation of each auxiliary device associated with the fuel cell so that the amount of water recovered from the exhaust gas discharged from the fuel cell increases;
    Each auxiliary device attached to the fuel cell so that the amount of water supplied to the fuel cell from the first tank that stores the water recovered from the exhaust gas discharged from the fuel cell is reduced. A second control for controlling the operation of
    Is possible and
    When the water level in the first tank is equal to or lower than a predetermined second predetermined water level, water recovery operation control is performed to perform at least one of the first control and the second control,
    Control that stops the power generation operation of the fuel cell device when the water level in the first tank is equal to or lower than the second predetermined water level after the water recovery operation control is executed and continued for a predetermined third predetermined time. To execute the control device.
14. In a control device for controlling a fuel cell device including a fuel cell,
    When the water level in the first tank for storing the water recovered from the exhaust gas discharged from the fuel cell is less than or equal to a predetermined second predetermined water level, the water is recovered from the exhaust gas. A first water recovery operation control step for performing a first control for controlling the operation of each auxiliary device associated with the fuel cell so that the amount of water increases;
    Each of the fuel cells is associated with the fuel cell so that the amount of water supplied from the first tank to the fuel cell is reduced when the water level in the first tank is equal to or lower than a predetermined second predetermined water level. A second water recovery operation control step for performing a second control for controlling the operation of the auxiliary machine;
    After at least one of the first water recovery operation control step and the second water recovery operation control step continues for a predetermined third predetermined time, the water level in the first tank is set to the second predetermined water level. A power generation operation stop step for stopping the power generation operation of the fuel cell device,
    A control program that executes

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