JP6037740B2 - Fuel cell power generator - Google Patents

Description

  The present invention relates to a fuel cell having a fuel electrode to which fuel gas is supplied and a cell including an oxygen electrode to which oxygen is supplied, a fuel cell-related device operated in connection with the operation of the fuel cell, a fuel cell, and a fuel An abnormality detection means for detecting an abnormal state in the battery-related equipment, and a control means for controlling the operation of the fuel cell and the fuel cell-related equipment, the control means of the fuel cell when the abnormality detection means detects an abnormal state The present invention relates to a fuel cell power generator configured to stop operation.

  Patent Document 1 discloses a system configured to stop the operation of a fuel cell power generator when a temperature abnormality is detected in a fuel cell-related device that is operated in association with the operation of the fuel cell during the operation of the fuel cell. Is described. Since the abnormality is detected by the abnormality detecting means and the system is stopped as described above, an effect of preventing damage to system components is expected. When the system is stopped in this way, it is preferable to prohibit the restart of the fuel cell unless the maintenance staff checks or repairs the abnormal part.

JP 2003-92127 A

When an instantaneous power failure or voltage drop occurs in the power system, the operation of the fuel cell power generator is not stopped with the fuel cell power generator disconnected from the power system. Temporarily continue operation with the grid connection inverter gate-blocked without disconnecting the fuel cell generator from the power system (temporary self-sustained operation) so that power generation can be resumed immediately after the voltage drop is recovered Operation to be performed is performed.
Moreover, when the state where the power system is interrupted continues instead of the instantaneous power failure of the power system, the fuel cell power generator can be operated independently in a state where it is disconnected from the power system.

  However, if the fuel cell power generator is operated in the above-mentioned autonomous operation state at the time of power failure, instantaneous power failure or instantaneous voltage drop, an abnormality that occurs due to the operation in the autonomous operation state appears. Sometimes.

  For example, in FIGS. 2 to 4, the fuel cell FC is connected to the power system 50, and the power consuming device 53 can be supplied with power from at least one of the power system 50 and the fuel cell FC. It is a figure which shows the structural example of a system. 2 to 4, the electric power generated by the fuel cell FC is supplied to the DC / DC converter 51 and converted into a desired voltage, and further converted into a desired AC power by the grid interconnection inverter 52. Converted. 2 to 4, two voltage lines (R phase and T phase) and one neutral line (N phase) are connected to the power system 50. Further, a neutral line is also connected to the inverter 52, and the neutral line is indicated by a broken line in the drawing. Then, the inverter 52 converts the input power from the DC / DC converter 51 into, for example, a single-phase three-wire AC200V using the N phase of the system power 50 as a neutral line at the time of a power failure, and outputs it at the time of a power failure. It is converted into single-phase, two-wire AC100V to the outlet 57 and output. Further, in the system illustrated in FIGS. 2 and 3, a switch 54 is provided between the output side of the inverter 52 and the power system 50, and the inverter 52 is used when the power system 50 is not powered by using the switch 54. The output side of the power system 50 is connected to the power system 50, and when the power system 50 is out of power, the output side of the inverter 52 can be connected to the electric outlet 57 (for example, a 100V load used in the case of a power outage can be connected). It is also possible to connect to an electrical outlet. Further, even when the output of the fuel cell FC is not consumed by the equipment connected to the electrical outlet 57 at the time of a power failure of the power system 50, the system illustrated in FIG. 2 uses the output power of the DC / DC converter 51 as the heater. The step-down converter as the control DC / DC converter 55 can be stepped down and the power can be consumed by the surplus power processing heater 56. In the system illustrated in FIG. 3, the output power of the inverter 52 is controlled by the heater. It can be consumed by the heater 59 under the control of the circuit 58.

  Even if the surplus power processing heater 56 illustrated in FIG. 2 or the heater 59 illustrated in FIG. 3 is used, only power less than the minimum generated power of the fuel cell FC may be consumed. Here, the minimum generated power of the fuel cell FC is determined by the generated power when the operation is performed that consumes the minimum fuel that can be stably operated with the amount of fuel used being reduced in a small direction.

As an example, when the minimum generated power of the fuel cell FC is 250 W and the maximum generated power is 700 W, that is, when there is no power outage (at the time of AC200V output), the generated power can be changed between 250 W and 700 W. Let us consider a case where the generated power can be changed between 250 W and 350 W at the time of AC 100 V output.
For example, in FIG. 2, the DC / DC converter 51 is configured to control its output voltage to DC 300V during a non-power failure, and to DC 150V during a power failure, and the heater control DC / DC converter 55 is stepped down. When the resistance value of the surplus power processing heater 56 is 110Ω when the surplus power processing heater 56 is 110 Ω, the surplus power processing heater 56 can consume a maximum of about 818 W of power if there is no power outage. At 56, only about 205W of power can be consumed. That is, the resistance value (110Ω) of the surplus power processing heater 56 is sufficient to consume the maximum generated power (700 W) of the fuel cell FC when there is no power failure, but the fuel cell when there is a power failure. Only about 205W less than that of the minimum generated power (250W) of FC can be consumed.
Similarly, in FIG. 3, the inverter 52 is configured to control its output voltage to 200 VAC during a non-power failure, and to 100 VAC during a power failure, and the heater control circuit 58 performs phase control, frequency division control, and the like. When the resistance value of the heater 59 is 50Ω and the heater 59 has a resistance value of 50Ω, the heater 59 can consume up to about 800 W of power when there is no power failure. Only about 200W of power can be consumed. That is, the resistance value (50Ω) of the heater 59 is a value sufficient to consume the maximum generated power (700 W) of the fuel cell FC when there is no power failure, but the minimum power generation of the fuel cell FC during a power failure. Only about 200 W less than that of the power (250 W) can be consumed.

  In the system illustrated in FIG. 4, the heater control circuit 58 and the heater 59 are provided on the output side of the inverter 52. However, if the inverter 52 is gate-blocked, the output of the fuel cell FC cannot be supplied to the heater 59.

  As described above, in any of the systems illustrated in FIGS. 2 to 4, when the fuel cell FC is operated in the self-sustaining operation state at the time of power failure, instantaneous power failure, or instantaneous voltage drop of the power system 50, In some cases, only electric power less than the generated power can be consumed, and in this case, the amount of fuel gas consumed at the fuel electrode of the fuel cell FC is reduced. As a result, the amount of fuel gas that is supplied to the fuel electrode of the fuel cell FC but is not consumed is increased. In the combustion section configured to burn the fuel electrode exhaust gas discharged from the fuel electrode, the amount of heat generated by the combustion of the fuel electrode exhaust gas increases, and an abnormality that the temperature of the combustion section becomes high may appear. There is. If the air-cooled or water-cooled radiator provided for heat dissipation of the fuel cell cooling water is not connected to the electrical outlet 57 in the self-sustained operation state of the fuel cell power generator, There may be a problem that the temperature rises abnormally, and a problem that the temperature of the heat medium of the air-cooled or water-cooled heat exchanger (not shown) that recovers the heat of the fuel electrode exhaust gas rises abnormally. Further, there may be a problem that the output voltage of the fuel cell FC is lowered due to the temperature abnormality.

  As described above, when the fuel cell power generation device as in Patent Document 1 is used, a temperature abnormality occurs during a self-sustaining operation at the time of power failure, instantaneous power failure, or instantaneous voltage drop. Operation may be stopped. When the operation of the fuel cell power generation apparatus is stopped due to such a temperature abnormality, the restart of the fuel cell is prohibited unless inspection or repair is performed by maintenance personnel. That is, when a fuel cell power generator as in Patent Document 1 is used, and when a self-sustained operation is performed at the time of a power failure, an instantaneous power failure, or an instantaneous voltage drop, the temperature abnormality is caused by the fuel cell and the fuel cell related device. Although it does not appear due to a failure of the device itself, there is a disadvantage that the restart of the fuel cell is prohibited even though inspection and repair by maintenance personnel are unnecessary.

  The present invention has been made in view of the above-described problems, and its purpose is that even if the abnormality detection means detects an abnormal state of the fuel cell and the fuel cell-related device, restarting is prohibited more than necessary. It is in the point which provides the fuel cell power generation device without this.

In order to achieve the above object, the fuel cell power generator according to the present invention includes a fuel cell having a fuel electrode supplied with fuel gas and a cell including an oxygen electrode supplied with oxygen, and operation of the fuel cell. A fuel cell-related device that is operated in connection with the fuel cell, an abnormality detection unit that detects an abnormal state in the fuel cell and the fuel cell-related device, and a control unit that controls operation of the fuel cell and the fuel cell-related device A fuel cell power generator comprising:
Comprising a power failure detection means for detecting that a power system connected to a power supply output destination of the fuel cell is in a power failure state,
The control means includes
When the power failure detection means has not detected the power failure state of the power system and the abnormality detection means has detected the abnormal state, the operation of the fuel cell is stopped in a state in which restart is prohibited,
When the power failure detection means detects the power failure state of the power system and the abnormality detection means detects the abnormal state, the operation of the fuel cell is stopped in a state in which restart is permitted ,
The abnormality detection means includes
As a criterion for determining whether or not it is an abnormal state, a threshold for power failure when the power failure detection means detects a power failure state of the power system, and the power failure detection means detects a power failure state of the power system. Use the threshold for non-power failure when not
When the power failure detection means is detecting the power failure state of the power system, it is determined that the abnormal state when the power failure threshold is reached,
When the power failure detection means has not detected the power failure state of the power system, it is determined that the abnormal state when the threshold for non-power failure is reached,
The power failure threshold is set to a value closer to the normal value than the non-power failure threshold.

According to the above characteristic configuration, the control means operates the fuel cell in a state where the restart is prohibited when the power failure detection means does not detect the power failure state of the power system and the abnormality detection means detects the abnormal state. Stop. In other words, the abnormal state detected by the abnormality detection means is generated regardless of the power failure state of the power system, but the control means stops the operation of the fuel cell while prohibiting the restart, It is possible to prevent the fuel cell and the fuel cell-related equipment from continuing to operate under abnormal conditions. As a result, it is possible to prevent the occurrence or worsening of the failure or the occurrence of an accident in the fuel cell power generator.
In addition, when the power failure detection means detects a power failure state of the power system and the abnormality detection means detects an abnormal state, the control means stops the operation of the fuel cell in a state where the restart is permitted. That is, the control unit allows the fuel cell to be restarted in consideration that the abnormal state detected by the abnormality detection unit is caused by a power failure state of the power system. As a result, the restarted fuel cell can be effectively used.
Therefore, even if the abnormality detection means detects an abnormal state of the fuel cell and the fuel cell-related device, it is possible to provide a fuel cell power generator in which restart is not prohibited more than necessary.
In addition, the abnormality detection means uses a power failure threshold value when the power failure detection means detects the power failure state of the power system, and the power failure detection means uses power as a reference for determining whether or not it is in an abnormal state. Different criteria are used, that is, a threshold for non-power failure when the power failure state of the system is not detected. In addition, the power failure threshold is set to a value closer to the normal value than the non-power failure threshold. That is, when the abnormality detection means determines that the abnormal state, i.e., the operating environment of the fuel cell power generator has deteriorated, and the operation of the fuel cell is stopped, the power failure state is the non-power failure state. The operating environment of the fuel cell power generation device is not relatively worse than it was at some time. As a result, it is possible to suppress as much as possible that the components of the fuel cell power generator are exposed to a harsh environment due to the power system being in a power failure state, and it is possible to suppress unnecessary damage to the components of the fuel cell power generator.

Another characteristic configuration of the fuel cell power generation device according to the present invention includes an abnormality storage unit capable of storing the abnormal state detected by the abnormality detection unit,
If the power failure detection means detects the power failure state of the power system when the abnormality detection means detects the abnormal state, the control means determines the abnormality state detected by the abnormality detection means as the abnormality. Stop the operation of the fuel cell without storing in the storage means, and the power failure detection means has not detected the power failure state of the power system when the abnormality detection means detects the abnormal state, Storing the abnormal state detected by the abnormality detection means in the abnormality storage means to stop the operation of the fuel cell;
The control means prohibits restart of the fuel cell if the operation of the fuel cell is stopped while the abnormal state is stored in the abnormal storage means, and the abnormal state is stored in the abnormal storage means. If the operation of the fuel cell is stopped while not being performed, the fuel cell is allowed to restart.

  According to the above characteristic configuration, the control unit is configured to stop the operation of the fuel cell with the abnormal state stored in the abnormal storage unit, or the fuel cell without the abnormal state stored in the abnormal storage unit. It is possible to determine whether to prohibit the restart of the fuel cell or to allow the restart of the fuel cell based on whether or not the operation is stopped. As a result, if the operation of the fuel cell is stopped with the abnormal state stored in the abnormal storage means, the restart of the fuel cell is prohibited and the occurrence or deterioration of the fuel cell power generation device or the occurrence of an accident If the operation of the fuel cell is stopped while no abnormal state is stored in the abnormal storage means, the restart of the fuel cell is permitted and the restarted fuel cell is effectively utilized. it can.

Still another characteristic configuration of the fuel cell power generator according to the present invention is an abnormality storage unit capable of storing the abnormal state detected by the abnormality detection unit;
Command receiving means for receiving a command from a user;
An error state notifying unit for notifying a user of an error state indicating that the fuel cell and the fuel cell related device have been stopped due to the abnormality detecting unit detecting the abnormal state;
When the abnormality detection unit detects the abnormal state, the control unit notifies the error state from the error state notification unit, and stores the abnormal state detected by the abnormality detection unit in the abnormality storage unit. To stop the operation of the fuel cell and the fuel cell-related equipment,
The control means, if the power failure detection means detects the power failure state of the power system when the abnormality detection means detects the abnormal state, the error state notified from the error state notification means. The user must set the state to be releasable using the command receiving means, and the power failure detection means must detect the power failure state of the power system when the abnormality detection means detects the abnormal state. For example, the error state notified from the error state notification unit is set to be unreleasable by the user using the command receiving unit,
If the abnormal condition is stored in the abnormality storage means and the operation of the fuel cell is stopped while the error state notified from the error condition notification means is not released, the control means The restart of the battery is prohibited, and the operation of the fuel cell is stopped in a state where the abnormal state is stored in the abnormality storage unit and the error state notified from the error state notification unit is released. In other words, the fuel cell is allowed to restart.

  According to the above characteristic configuration, the control means determines whether the operation of the fuel cell is stopped in a state where the error state is not released, or whether the operation of the fuel cell is stopped in a state where the error state is released. Based on this, it is possible to decide whether to prohibit the restart of the fuel cell or to allow the restart of the fuel cell. As a result, if the fuel cell operation is stopped without the error state being released, the restart of the fuel cell is prohibited to prevent the occurrence or deterioration of the fuel cell power generation device or the occurrence of an accident. If the operation of the fuel cell is stopped while the error state is released, the restart of the fuel cell is permitted and the restarted fuel cell can be effectively used.

Still another characteristic configuration of the fuel cell power generation device according to the present invention is that, when the abnormality detecting means determines whether or not the abnormal state is present , the raw fuel is steam reformed to mainly contain hydrogen. The temperature of the reforming unit that generates the fuel gas, and the combustion unit that burns the fuel electrode exhaust gas discharged from the fuel electrode after being used for the power generation reaction in the fuel cell and heats the reforming unit. The temperature, the temperature of the cooling water after cooling the cell, the temperature of the heat medium after recovering heat from the cooling water, and the temperature of the steam generating section that generates steam to be supplied to the reforming section , and the temperature of the fuel gas, and the output voltage from the cell, and the temperature of the heating medium after the heat has been recovered from the fuel electrode exhaust gas, and, in the reformed gas produced in the reforming section The temperature of the metamorphic part that converts carbon monoxide contained in it to carbon dioxide, Beauty, at the least either one is a threshold value for the time threshold or not the power failure for power failure of the temperature of the oxidation unit of carbon monoxide remaining in the gas after the shift process is oxidized to carbon dioxide by the shift converter It lies in determining said in an abnormal state.

According to the above characteristic configuration, the abnormality detection means, as a reference for determining whether or not it is in an abnormal state, a power failure threshold when the power failure detection means detects a power failure state of the power system, and As the threshold for non-power failure when the power failure detection means does not detect the power failure state of the power system, the temperature of the reforming unit that generates the fuel gas mainly composed of hydrogen by steam reforming the raw fuel, and The temperature of the combustion part that heats the reforming part by burning the fuel electrode exhaust gas discharged from the fuel electrode after being used for the power generation reaction in the fuel cell, the temperature of the cooling water after cooling the cell, and cooling The temperature of the heat medium after recovering heat from the water, the temperature of the steam generating section that generates steam to be supplied to the reforming section, the temperature of the fuel gas, the output voltage from the cell , and the fuel temperature of heating medium after the recovery of heat from the electrode exhaust gas, and, prior to The carbon monoxide contained in the reformed gas generated in the reforming section is transformed to carbon dioxide, and the carbon monoxide remaining in the gas after the transforming process in the transforming section is carbon dioxide. one at least one of the temperature of the oxidation unit for oxidizing the carbon used.

  Still another characteristic configuration of the fuel cell power generator according to the present invention is that the control unit operates so that the fuel cell is operated with the minimum generated power when the power failure detection unit detects the power failure state. is there.

  According to the above characteristic configuration, the fuel cell power generation device operates so that the fuel cell is operated with the minimum generated power. Therefore, the fuel cell emits the fuel gas discharged without being consumed at the fuel electrode from the minimum generated power. Can be relatively less than when operating at a high output. As a result, for example, in the combustion section configured to burn the fuel electrode exhaust gas discharged from the fuel electrode, the amount of heat generated by the combustion of the fuel electrode exhaust gas is prevented from being excessive, and the temperature of the combustion section is high. It is possible to reduce the possibility of occurrence of abnormalities.

It is a figure explaining the composition of a fuel cell power generator. It is a figure which shows the structural example of the system which connected the fuel cell to the electric power system. It is a figure which shows the structural example of the system which connected the fuel cell to the electric power system. It is a figure which shows the structural example of the system which connected the fuel cell to the electric power system.

<First Embodiment>
The fuel cell power generator according to the first embodiment will be described below with reference to the drawings.
FIG. 1 is a diagram illustrating the configuration of a fuel cell power generator. The fuel cell power generator includes a fuel cell FC having a cell C including a fuel electrode 3 to which fuel gas is supplied and an oxygen electrode 5 to which oxygen is supplied, and a fuel cell that is operated in connection with the operation of the fuel cell FC. And related equipment. Fuel cell-related devices are directly used for various devices used in the generation and supply process of fuel gas to be supplied to the fuel cell FC (such as the reforming unit 1, the combustion unit 2, the water vapor generating unit 9) and the cooling application of the fuel cell FC. The cooling unit 6, the heat exchanger 8, the heat exchanger 60, the hot water storage tank 7, the pumps P1, P2, and various auxiliary devices such as sensors, which are used manually or indirectly. The cell C is configured by sandwiching the electrolyte membrane 4 between the fuel electrode 3 and the oxygen electrode 5. Although only a single cell C is shown in FIG. 1 for the sake of simplicity, the fuel cell FC includes a plurality of stacked cells C.

  The cooling unit 6 is provided in the fuel cell FC for the purpose of cooling the fuel cell FC by recovering heat generated during power generation. In this embodiment, a water-cooled cooling unit 6 is employed. Specifically, water (hereinafter referred to as “cooling water”) circulated through the cooling water circulation path 17 by the pump P1 is supplied to the cooling unit 6 to cool the fuel cell FC. The cooling water whose temperature has risen by passing through the cooling unit 6 flows into the heat exchanger 8 provided in the middle of the cooling water circulation path 17. Although details will be described later, in this heat exchanger 8, the cooling water exchanges heat with a heat medium (for example, hot water) flowing through the exhaust heat recovery path 19 and passes the exhaust heat recovered from the fuel cell FC to the heat medium. . The heat medium is stored in the hot water storage tank 7 where heat is stored.

  A raw fuel containing hydrocarbons (for example, city gas containing methane) is supplied to the reforming unit 1 via the raw material gas passage 11, and water vapor generated by the water vapor generating unit 9 is supplied to the reforming unit 1. Supplied via line 18. In the present embodiment, the water supply path 18 is a flow path branched from the cooling water circulation path 17, and the water that is the basis of the water vapor generated in the water vapor generation unit 9 is the same as the water circulating in the cooling water circulation path 17. is there. When the fuel cell FC is operated, the valve V1 is opened and water is supplied to the water vapor generating unit 9, and when the fuel cell FC is operated, the valve V1 is closed and water is not supplied to the water vapor generating unit 9. The reforming unit 1 performs steam reforming of the raw fuel by using the combustion heat provided from the combusting unit 2 provided therewith. The fuel gas mainly composed of hydrogen obtained by steam reforming in the reforming unit 1 is supplied to the fuel electrode 3 through the fuel gas passage 12. Moreover, although not shown in figure, it can be made to generate | occur | produce water vapor | steam by supplying the combustion heat generated in the combustion part 2 also to the water vapor | steam generation part 9. FIG.

In the fuel electrode 3, not all the supplied fuel gas is consumed in the power generation reaction. Therefore, fuel gas components such as hydrogen remain in the fuel electrode exhaust gas discharged from the fuel electrode 3. Therefore, fuel electrode exhaust gas is used as the combustion gas in the combustion section 2. Specifically, the fuel electrode exhaust gas is supplied from the fuel electrode 3 to the combustion unit 2 through the fuel electrode exhaust gas passage 13. The combustion exhaust gas after being combusted in the combustion unit 2 is discharged to the outside through the combustion exhaust gas passage 14. A heat exchanger 60 is provided in the middle of the fuel electrode exhaust gas passage 13. In the heat exchanger 60, the fuel electrode exhaust gas flowing through the fuel electrode exhaust gas passage 13 exchanges heat with the heat medium flowing through the exhaust heat recovery passage 19, and passes the heat held by the fuel electrode exhaust gas to the heat medium. The heat medium is stored in the hot water storage tank 7 where heat is stored.
Oxygen (air) is supplied to the oxygen electrode 5 through the air passage 15. The gas used for the power generation reaction at the oxygen electrode 5 is discharged through the exhaust air passage 16.
Although not shown, moisture contained in the fuel electrode exhaust gas, the gas discharged from the oxygen electrode 5 and the combustion exhaust gas is recovered and supplied to the cooling water and water vapor generating section 9 flowing through the cooling water circulation path 17. It can be reused as water.

  The exhaust heat recovered from the cooling water in the heat exchanger 8 (that is, exhaust heat recovered from the fuel cell FC) and the exhaust heat recovered from the fuel electrode exhaust gas in the heat exchanger 60 are passed through the exhaust heat recovery path 19. It is given to the flowing heat medium, and the heat medium is stored in the hot water storage tank 7. Then, the heat medium stored in the hot water storage tank 7 circulates between the hot water storage tank 7, the heat exchanger 8, and the heat exchanger 60 through the exhaust heat recovery path 19. The flow rate of the heat medium in the exhaust heat recovery path 19 is adjusted by the pump P2. Further, the heat medium stored in the hot water storage tank 7 is supplied to the heat utilization device 10 through the heat medium circulation path 20. The flow rate of the heat medium in the heat medium circuit 20 is adjusted by the pump P3. When the heat utilization device 10 is a floor heating device or the like that uses only the heat of the heat medium, the heat medium after the heat is utilized by the heat utilization device 10 returns to the hot water storage tank 7 through the heat medium circulation path 20. . Alternatively, when the heat utilization device 10 is a hot water supply device using the heat medium itself, the heat medium does not return to the hot water storage tank 7.

  The electric power generated by the fuel cell FC is supplied to the DC / DC converter 51, converted into a desired voltage, and further converted into desired AC power by the inverter 52. The power output from the inverter 52 is supplied to the power consuming device 53. A power system 50 is also connected to the power consuming device 53. That is, the power consuming device 53 can be supplied with power from at least one of the fuel cell FC and the power system 50. Thus, the power system 50 is a system connected to the supply destination of the generated power of the fuel cell FC. In FIG. 1, two voltage lines (R phase and T phase) and one neutral line (N phase) are connected to the power system 50. Further, a neutral line is also connected to the inverter 52, and the neutral line is indicated by a broken line in the drawing.

  A switch 54 is provided between the output side of the inverter 52 and the power system 50. The switch 54 is switched between a switching state in which the output side of the inverter 52 is connected to the power system 50 and a switching state in which the output side of the inverter 52 is connected to the electrical outlet 57. The electrical outlet 57 is, for example, an electrical outlet that can connect a 100V load used during a power failure.

  The operation control device 30 performs the switching operation of the switch 54, the operation of the DC / DC converter 51, and the operation of the heater control DC / DC converter 55 (in this embodiment, a step-down converter) as described later.

  The fuel cell power generator includes a remote control device 40 having command receiving means 41, display means 42, and audio output means 43. The remote control device 40 is provided inside a house or facility where the fuel cell power generation device is installed. The command receiving means 41 can be used, for example, to change a setting such as a command for starting / stopping the fuel cell FC and a power generation possible time zone. The display means 42 can display, for example, the operating state of the fuel cell FC, the heat utilization device 10, and the power consumption device 53. The voice output unit 43 can output information by voice or sound, for example.

Next, the configuration of the operation control device 30 provided in the fuel cell power generator will be described.
The operation control device 30 includes an abnormality detection unit 31 that detects an abnormal state in the fuel cell FC and the fuel cell related device, a control unit 32 that controls the operation of the fuel cell FC and the fuel cell related device, and power generation of the fuel cell FC. A power failure detection means 33 for detecting that the power system 50 connected to the output supply destination is in a power failure state. Furthermore, the fuel cell power generator of this embodiment includes an abnormality storage unit 34 that can store the abnormal state detected by the abnormality detection unit 31. Then, when the power failure detection unit 33 has not detected the power failure state of the power system 50 and the abnormality detection unit 31 has detected the abnormal state, the control unit 32 prohibits the restarting of the fuel cell FC and the fuel cell. When the operation of the related equipment is stopped, the power failure detection means 33 detects the power failure state of the power system 50, and the abnormality detection means 31 detects the abnormality state, the fuel cell FC and the fuel cell are allowed in the restarting state. Control to stop the operation of related equipment.

  The anomaly detection means 31 uses the temperature of the reforming unit 1 that generates a fuel gas mainly composed of hydrogen by steam reforming the raw fuel, and the fuel electrode 3 after being used for the power generation reaction in the fuel cell FC. The temperature of the combustion section 2 for burning the discharged fuel electrode exhaust gas to heat the reforming section 1, and the temperature of the cooling water after cooling the cell C (that is, after recovering heat from the cell C), The temperature of the heat medium flowing out of the heat exchanger 8 for recovering heat from the cooling water and flowing through the exhaust heat recovery path 19 (that is, the temperature of the heat medium after recovering heat from the cooling water), and reforming Outflow from the heat exchanger 60 that recovers heat from the temperature of the water vapor generating unit 9 that generates water vapor to be supplied to the unit 1, the temperature of the fuel gas, the output voltage from the cell C, and the fuel electrode exhaust gas. The temperature of the heat medium flowing through the exhaust heat recovery path 19 (that is, after recovering heat from the fuel electrode exhaust gas) Monitoring the temperature) of the medium determines reaches the threshold set each is abnormal state. That is, the abnormality detection means 31 indicates whether or not an abnormal state has occurred in the fuel cell FC, and the fuel cell-related equipment such as the cooling system having the reforming unit 1, the combustion unit 2, and the cooling unit 6, and the steam generation unit 9. Judging.

  Specifically, the temperature of the reforming unit 1 is measured by the reforming unit temperature sensor 21. The temperature of the combustion unit 2 is measured by the combustion unit temperature sensor 22. The temperature of the cooling water after cooling the cell C is measured by a cooling water temperature sensor 23 provided near the cooling water outlet from the cooling unit 6. The temperature of the heat medium after recovering heat from the cooling water is measured by a heat medium temperature sensor 24 provided in the vicinity of the heat medium outlet from the heat exchanger 8. The temperature of the water vapor generation unit 9 is measured by the water vapor generation unit temperature sensor 25. The temperature of the fuel gas is measured by a fuel gas temperature sensor 26 provided near the fuel gas inlet to the fuel electrode 3. The output voltage from the cell C is measured by an output voltage sensor 27 provided between the cell C and the DC / DC converter 51. The temperature of the heat medium after recovering heat from the fuel electrode exhaust gas is measured by a heat medium temperature sensor 29 provided in the vicinity of the heat medium outlet from the heat exchanger 60.

  For example, the power failure detection means 33 refers to the voltage value of the power of the power system 50 detected by the power system voltage sensor 28 or refers to the interval between the zero cross points of the voltage waveform, so that the power system 50 is in a power failure state. It is determined whether or not. For example, the power failure detection means 33 determines that the power system 50 is in a power failure state when the voltage value of the power of the power system 50 becomes less than a predetermined voltage, and the power voltage value of the power system 50 rises above the predetermined voltage. Then, it is determined that the power has been restored (that is, from the power failure state to the non-power failure state). Alternatively, the power failure detection means 33 determines that the power system 50 is in a power failure state if the interval between the zero cross points of the power of the power system 50 exceeds, for example, 10 msec. When the power frequency of the power system 50 is 60 Hz, zero cross points should be detected at intervals of about 8.3 msec. Then, the power failure detection means 33 determines that the power system 50 has recovered if the interval between the zero cross points of the power of the power system 50 is shorter than, for example, 8.5 msec (that is, the power failure state has changed to the non-power failure state). To do.

When the power failure detection means 33 detects the instantaneous power failure state of the power system 50, the operation of the fuel cell power generation device is not stopped in a state where the fuel cell power device is disconnected from the power system 50, but from the instantaneous power failure. In order to restart the power generation immediately after the power recovery, the operation of allowing the fuel cell power generator to continue operation temporarily (temporary self-sustained operation) with the inverter 52 gate-blocked without disconnecting from the power system 50 is performed. Done. In this case, the control means 32 uses an electric circuit provided in the inverter 52, from the inverter 52 that is electrically connected without interrupting the electrical connection between the output side of the inverter 52 and the power system 50. Makes no output at all. Then, the control means 32 reduces the output power of the DC / DC converter 51 using the heater control DC / DC converter (step-down converter) 55 while continuing the operation of the fuel cell power generation device (fuel cell FC). The power is consumed by the surplus power processing heater 56.
In addition, when the power failure state of the power system 50 continues, the control means 32 can cause the fuel cell power generator to be disconnected from the power system 50 and operate independently. In this case, the control means 32 switches the switch 54 provided between the output side of the inverter 52 and the power system 50 to a state where the output side of the inverter 52 and the electrical outlet 57 are connected. As a result, power supply to the electrical outlet 57 can be continued.

  In addition, when the fuel cell power generator is operated in the above-described self-sustaining operation state at the time of a power outage and an instantaneous power outage of the power system 50 as described above, abnormalities caused by the operation in the self-sustaining operation state are abnormal. It may be detected by the detection means 31. For example, in the self-sustaining operation state performed at the time of an instantaneous power failure of the power system 50, the power consuming device 53 is not connected to the fuel cell FC, and the generated power of the fuel cell FC is consumed using the surplus power processing heater 56. Is done. Moreover, in the self-sustaining operation state performed at the time of a power failure of the power system 50, only a highly important power consuming device (not shown) that needs to be operated at the time of a power failure is connected to the electrical outlet 57. Further, even when the output of the fuel cell FC is not consumed by a device connected to the electrical outlet 57 at the time of a power failure of the power system 50, the output power of the DC / DC converter 51 is converted into a DC / DC converter for heater control (step-down type). The converter 55 can be stepped down and the power can be consumed by the surplus power processing heater 56.

  However, the resistance value of the surplus power processing heater 56 as shown in FIG. 1 is large enough to consume all the power generated by the fuel cell FC when AC200V output is performed during a non-power failure. Even when the fuel cell FC is operated with the minimum generated power during the self-sustained operation in which AC 100V output is being performed to the outlet 57 at times, the output is not large enough to be consumed. For example, when the minimum generated power of the fuel cell FC is 250 W and the maximum generated power is 700 W, that is, when there is no power outage (at the time of AC200V output), the generated power can be changed between 250 W and 700 W. Consider a case where the generated power can be changed between 250 W and 350 W at the time of AC 100 V output. In this case, the DC / DC converter 51 is configured to control its output voltage to DC 300 V during a non-power failure and to DC 150 V during a power failure, and the surplus power processing heater 56 has a resistance value of 110Ω. At the time of non-power outage, the surplus power processing heater 56 can consume up to about 818 W of power, but the surplus power processing heater 56 can consume up to about 205 W of power at the time of power outage. That is, the resistance value (110Ω) of the surplus power processing heater 56 is sufficient to consume the maximum generated power (700 W) of the fuel cell FC when there is no power failure, but the fuel cell when there is a power failure. Only about 205W less than that of the minimum generated power (250W) of FC can be consumed.

  As described above, the power consumption becomes relatively small at any time of the power failure of the power system 50, the instantaneous power failure, and the instantaneous voltage drop. Therefore, when the fuel cell power generator is operated in a self-sustaining operation at the time of a power failure, an instantaneous power failure, or an instantaneous voltage drop, the fuel that is supplied to the fuel electrode 3 of the fuel cell FC but is discharged without being consumed. More gas. As a result, in the combustion part 2 configured to burn the fuel electrode exhaust gas discharged from the fuel electrode 3, the amount of heat generated by the combustion of the fuel electrode exhaust gas increases, and the temperature of the combustion part 2 becomes high. May appear. In addition, when an air-cooled or water-cooled radiator (not shown) provided for heat dissipation of the cooling water is not connected to the electrical outlet 57 in the self-sustaining operation state of the fuel cell power generator, the cooling water Problems such as an abnormal increase in temperature and problems such as an abnormal increase in the temperature of the heat medium flowing out of the heat exchanger 60 that recovers the heat of the fuel electrode exhaust gas may occur. Further, there may be a problem that the output voltage of the fuel cell FC is lowered due to the temperature abnormality.

  As described above, the abnormal state detected by the abnormality detection means 31 is caused due to the power failure of the power system 50 and is generated regardless of the power failure of the power system 50 (that is, the fuel cell FC and the fuel). It can be presumed to be caused by a failure of a battery-related device or the like, and it is a real problem). If an abnormal state that can be estimated to be caused by a failure of the fuel cell FC or fuel cell-related equipment is detected, the operation of the fuel cell power generator is stopped and measures such as inspection and repair by maintenance personnel are taken. It is actually necessary to receive. On the other hand, if an abnormal state caused by a power failure of the power system 50 is detected, it can be assumed that it is not caused by a failure of the fuel cell FC and fuel cell related equipment. The fuel cell FC may be allowed to restart without taking measures such as repairs.

  Therefore, in this embodiment, the control means 32 is in a state in which the restart is prohibited when the power failure detection means 33 does not detect the power failure state of the power system 50 and the abnormality detection means 31 detects the abnormal state. The operation of the fuel cell FC is stopped. In other words, the abnormal state detected by the abnormality detection unit 31 is generated regardless of the power failure state of the power system 50, but the control unit 32 stops the operation of the fuel cell FC in a state where the restart is prohibited. By doing so, it is possible to prevent the fuel cell FC and the fuel cell-related equipment from continuing to operate under abnormal conditions. As a result, it is possible to prevent the occurrence or worsening of the failure or the occurrence of an accident in the fuel cell power generator. In addition, when the power failure detection means 33 detects the power failure state of the power system 50 and the abnormality detection means 31 detects the abnormality state, the control means 32 operates the fuel cell FC in a state in which restart is permitted. Stop. That is, the control unit 32 allows the fuel cell FC to be restarted in consideration that the abnormal state detected by the abnormality detection unit 31 is caused by the power failure state of the power system 50. . As a result, the restarted fuel cell FC can be used effectively.

  When the operation of the fuel cell FC is stopped when the power failure detection means 33 has not detected the power failure state of the power system 50 and the abnormality detection means 31 has detected the abnormality state, the conventional abnormality detection means 31 is stopped. As in the case of detecting an abnormal condition, the system will not be restarted unless it is inspected and repaired by maintenance personnel. On the other hand, when the operation of the fuel cell FC is stopped when the power failure detection unit 33 detects the power failure state of the power system 50 and the abnormality detection unit 31 detects the abnormal state, The restart is possible without going through the same inspection / repair by maintenance personnel as when the power failure detection means 33 detects the power failure state. When the control unit 32 refers to the detection result of the power failure detection unit 33 and determines that the power supply of the power system 50 has been restored, the control unit 32 automatically restarts the fuel cell FC and the fuel cell related device.

  More specifically, in the present embodiment, the control unit 32 prohibits the restart of the fuel cell FC if the operation of the fuel cell FC is stopped while the abnormal storage unit 34 stores the abnormal state. It is configured as follows. However, if the power failure detection means 33 detects the power failure state of the electric power system 50 when the abnormality detection means 31 detects the abnormal state, the control means 32 stores the abnormal state detected by the abnormality detection means 31 as the abnormality storage means. If the operation of the fuel cell FC is stopped without being stored in 34, and the power failure detection means 33 does not detect the power failure state of the power system 50 when the abnormality detection means 31 detects an abnormal condition, the abnormality detection means The abnormal state detected by 31 is stored in the abnormality storage means 34 to stop the operation of the fuel cell FC.

  As described above, the control unit 32 is configured to stop the operation of the fuel cell FC in the state where the abnormal state is stored in the abnormality storage unit 34 or the fuel in the state where the abnormal state is not stored in the abnormality storage unit 34. Based on whether the operation of the battery FC is stopped, it can be determined whether the restart of the fuel cell FC is prohibited or the restart of the fuel cell FC is allowed. As a result, if the operation of the fuel cell FC is stopped with the abnormal state stored in the abnormality storage means 34, the restart of the fuel cell FC is prohibited and the failure or deterioration of the fuel cell power generation device is The occurrence of an accident can be prevented, and if the operation of the fuel cell FC is stopped with no abnormal state stored in the abnormality storage means 34, the fuel cell FC is allowed to restart and restarted. The fuel cell FC can be used effectively.

  Note that the control means 32 operates so that the fuel cell FC is operated with the lowest generated power (the lowest value of the output power) when the power failure detection means 33 detects the power failure state. That is, the fuel cell power generation device operates so that the fuel cell FC operates independently with the minimum generated power, and therefore, the fuel gas discharged without being consumed by the fuel electrode 3 can be relatively reduced. As a result, for example, in the combustion unit 2 configured to burn the fuel electrode exhaust gas discharged from the fuel electrode 3, the amount of heat generated by the combustion of the fuel electrode exhaust gas is prevented from being excessive, The possibility that an abnormality in which the temperature becomes high appears can be reduced.

Second Embodiment
The fuel cell power generator according to the second embodiment is different from the first embodiment in the manner of stopping the operation of the fuel cell FC by the control means 32. The fuel cell power generator according to the second embodiment will be described below, but the description of the same configuration as that of the first embodiment will be omitted.

  In the present embodiment, the fuel cell power generation apparatus includes an abnormality storage unit 34 that can store an abnormal state detected by the abnormality detection unit 31, a command reception unit 41 that receives a command from a user, and the abnormality detection unit 31 that has detected an abnormal state. Error state notifying means (display means 42, sound output means 43) for notifying the user of an error state indicating that the fuel cell FC and the fuel cell related device have been stopped in accordance with the detection. Then, the error state notification means continues to notify the error state until the error state is canceled.

  The error state notification means can be realized by using at least one of the display means 42 and the sound output means 43 that the remote control device 40 has. For example, information indicating an error state such as “Power generation stopped. Please contact the maintenance company” is reported as text information using the display means 42 (for example, displayed until the error state is cleared). Etc.) and can be notified as audio information using the audio output means 43 (for example, output audio at predetermined timing until the error state is canceled).

When the abnormality detection unit 31 detects an abnormal state, the control unit 32 notifies the error state from the error state notification unit as described above, and stores the abnormal state detected by the abnormality detection unit 31 in the abnormality storage unit 34. To stop the operation of the fuel cell FC.
Furthermore, if the power failure detection means 33 detects the power failure state of the power system 50 when the abnormality detection means 31 detects the abnormal state, the control means 32 will indicate the error state notified from the error state notification means. Is set to a releasable state using the command receiving means 41, and if the power failure detection means 33 does not detect the power failure state of the power system 50 when the abnormality detection means 31 detects the abnormal state, an error state The user sets the error state notified from the notification means using the command receiving means 41 so that it cannot be canceled. That is, when a maintenance company is contacted and a maintenance person visits to perform inspection / repair, the maintenance person can release the error state notified from the error state notification means.

  Then, if the abnormality state is stored in the abnormality storage unit 34 and the operation of the fuel cell FC is stopped in a state where the error state notified from the error state notification unit has not been released, the control unit 32 stops the fuel cell FC. If the operation of the fuel cell FC is stopped in a state where the abnormal state is stored in the abnormality storage unit 34 and the error state notified from the error state notification unit is released, the fuel cell FC is stopped. Allow FC restart. In this way, if the operation of the fuel cell FC is stopped in a state where the error state has not been canceled, the restart of the fuel cell FC is prohibited, and the occurrence or deterioration of the fuel cell power generation device or the occurrence of an accident occurs. If the operation of the fuel cell FC is stopped while the error state is released, the restart of the fuel cell FC is permitted, and the restarted fuel cell FC can be used effectively.

<Third Embodiment>
The fuel cell power generator of the third embodiment is different from the above embodiment in the abnormality detection means 31 for determining the abnormal state of the fuel cell FC and the fuel cell-related equipment. The fuel cell power generator according to the third embodiment will be described below, but the description of the same configuration as that of the embodiments described so far will be omitted.

In the present embodiment, the abnormality detection means 31 switches between a plurality of threshold values of a power failure threshold value and a non-power failure threshold value in order to detect an abnormal state in the fuel cell FC and the fuel cell related device. Specifically, when the power failure detection means 33 detects the power failure state of the power system 50, the abnormality detection means 31 determines the temperature of the reforming unit 1, the temperature of the combustion unit 2, and the cell C. The temperature of the cooling water after cooling, the temperature of the heat medium after recovering heat from the cooling water, the temperature of the water vapor generating unit 9, the temperature of the fuel gas, and the output voltage from the cell C, And when at least any one of the temperature of the heating medium after recovering heat from the fuel electrode exhaust gas reaches the respective power outage threshold, it is determined that the state is abnormal. In addition, when the power failure detection means 33 has not detected the power failure state of the power system 50, the abnormality detection means 31 has cooled the temperature of the reforming unit 1, the temperature of the combustion unit 2, and the cell C. The temperature of the subsequent cooling water, the temperature of the heat medium after recovering heat from the cooling water, the temperature of the water vapor generation unit 9, the temperature of the fuel gas, the output voltage from the cell C, the fuel electrode exhaust gas When at least one of the temperatures of the heat medium after recovering the heat from each becomes a threshold for non-power failure different from the threshold for power failure, it is determined that the state is abnormal.
Table 1 below illustrates the threshold for non-power failure, the threshold for power failure, and the normal value (normal range during normal operation).

  As described above, each power failure threshold value is different from each non-power failure threshold value and is more normal than each non-power failure threshold value (that is, a low temperature side for temperature and a high voltage side for output voltage). ). Thus, based on either the power failure threshold or the non-power failure threshold, the abnormality detection means 31 operates the operating environment of the fuel cell FC according to the occurrence of a power failure in the power system 50 or the normal power supply state. When the degree of deterioration does not progress relatively, it is determined as an abnormal state, and as a result, the operation of the fuel cell FC is stopped. That is, when it is determined by the abnormality detection means 31 that there is an abnormal state, that is, a state where the operating environment of the fuel cell power generation device has deteriorated, and the operation of the fuel cell FC is stopped, the power failure state is better. The operating environment of the fuel cell power generation device is not relatively deteriorated compared to the state. As a result, it is possible to suppress as much as possible that the components of the fuel cell power generator are exposed to a harsh environment due to the power system 50 being in a power failure state, and it is possible to suppress unnecessary damage to the components of the fuel cell power generator. .

<Another embodiment>
<1>
In the said embodiment, although the specific example was given and demonstrated about the structure of the fuel cell electric power generating apparatus, the structure is not limited to what was mentioned above, It can change suitably. For example, the carbon monoxide contained in the reformed gas (gas containing hydrogen as a main component) generated in the reforming unit 1 is converted into carbon dioxide, or the gas remaining in the gas after the conversion process. You may provide the oxidation part etc. which oxidize carbon oxide to a carbon dioxide. Further, the connection position of the power consuming device 53, the connection position of the surplus power processing heater 56, and the like can be changed as appropriate.

<2>
In the said embodiment, although illustrated about the detection target of the abnormality detection means 31, it is good also considering a thing other than what was mentioned above as a detection target. For example, the abnormality detection means 31 may be configured to detect a temperature abnormality in the above-described metamorphic part or oxidation part. Furthermore, the numerical values exemplified for the above-described threshold for power failure, threshold for non-power failure, and normal range during normal operation can be changed as appropriate.

<3>
In the said embodiment, if the power failure detection means 33 raises the voltage value of the electric power of the electric power grid | system 50 to more than predetermined voltage, or if the space | interval of the zero crossing point of the electric power of the electric power grid | system 50 becomes shorter than 8.5 msec, for example. The example in which it is determined that the power system 50 has recovered from power (that is, from the power failure state to the non-power failure state) has been described. However, when determining that the power system 50 has changed from the power failure state to the non-power failure state, Other information may be referred to in addition to the value and the zero cross point interval.
For example, for the purpose of confirming that the power system 50 has stabilized after power recovery, if the power failure detection means 33 increases the voltage value of the power of the power system 50 to a predetermined voltage or higher and the state continues for a predetermined period of time. Alternatively, if the interval between the zero cross points of the electric power in the electric power system 50 is shorter than 8.5 msec, for example, and the state continues for a predetermined period, the electric power system 50 is restored (that is, from the power failure state to the non-power failure state). May be determined. In this case, the autonomous operation of the fuel cell FC is continued until the power failure detection means 33 determines that the power system 50 has recovered from the power failure state to the non-power failure state. In the second embodiment, the abnormality detection means 31 and the power failure detection means 33 until the power system 50 determines that the power system 50 has recovered from the power failure state to the non-power failure state. The power outage threshold is used to detect an abnormal state at the power source, and the power outage threshold is used after determining that the power system 50 has recovered from the power outage state to the non-power outage state.

<4>
In the above embodiment, the method of monitoring the voltage value of the power system 50 and the interval between the zero cross points is exemplified as the method of detecting the power failure by the power failure detection means 33. However, other determination methods may be used. For example, from the method of detecting a power failure by increasing or decreasing the harmonic component of the voltage of the power system 50, or the frequency change rate of the voltage or current of the power system 50, the reactive power is injected sharply so as to further promote the frequency change, A method of detecting a power failure depending on whether or not a frequency abnormality occurs can be used.

  The present invention can be applied to a fuel cell power generation apparatus in which restart is not prohibited more than necessary even when the abnormality detection means detects an abnormal state of the fuel cell and the fuel cell related device.

1 Reformer (fuel cell equipment)
2 Combustion section (fuel cell equipment)
3 Fuel electrode (cell C)
4 Electrolyte membrane (cell C)
5 Oxygen electrode (cell C)
6 Cooling section (fuel cell related equipment)
7 Hot water storage tank (fuel cell related equipment)
8 Heat exchanger (fuel cell equipment)
9 Water vapor generator (fuel cell equipment)
31 Abnormality detection means 32 Control means 33 Power failure detection means 34 Abnormality storage means 41 Command reception means 42 Display means (error state notification means)
43 Voice output means (error status notification means)
50 Power system 60 Heat exchanger

Claims (5)

A fuel cell having a cell including a fuel electrode to which fuel gas is supplied and an oxygen electrode to which oxygen is supplied;
Fuel cell-related equipment operated in connection with the operation of the fuel cell;
An abnormality detecting means for detecting an abnormal state in the fuel cell and the fuel cell-related device;
A fuel cell power generation device comprising control means for controlling operation of the fuel cell and the fuel cell-related equipment,
Comprising a power failure detection means for detecting that a power system connected to a power supply output destination of the fuel cell is in a power failure state,
The control means includes
When the power failure detection means does not detect the power failure state of the power system and the abnormality detection means detects the abnormal state, the fuel cell and the fuel cell related device are operated in a state in which restart is prohibited. Stop
When the power failure detection unit detects the power failure state of the power system and the abnormality detection unit detects the abnormal state, the fuel cell and the fuel cell related device are operated in a state in which restart is permitted. Stop ,
The abnormality detection means includes
As a criterion for determining whether or not it is an abnormal state, a threshold for power failure when the power failure detection means detects a power failure state of the power system, and the power failure detection means detects a power failure state of the power system. Use the threshold for non-power failure when not
When the power failure detection means is detecting the power failure state of the power system, it is determined that the abnormal state when the power failure threshold is reached,
When the power failure detection means has not detected the power failure state of the power system, it is determined that the abnormal state when the threshold for non-power failure is reached,
The power failure threshold, the fuel cell power generation system than a non power failure threshold that is set to the side of the value close to the normal value. An abnormality storage means capable of storing the abnormal state detected by the abnormality detection means;
If the power failure detection means detects the power failure state of the power system when the abnormality detection means detects the abnormal state, the control means determines the abnormality state detected by the abnormality detection means as the abnormality. Stop the operation of the fuel cell without storing in the storage means, and the power failure detection means has not detected the power failure state of the power system when the abnormality detection means detects the abnormal state, Storing the abnormal state detected by the abnormality detection means in the abnormality storage means to stop the operation of the fuel cell;
The control means prohibits restart of the fuel cell if the operation of the fuel cell is stopped while the abnormal state is stored in the abnormal storage means, and the abnormal state is stored in the abnormal storage means. 2. The fuel cell power generator according to claim 1, wherein the fuel cell is allowed to restart if the operation of the fuel cell is stopped while the fuel cell is not operated. Abnormality storage means capable of storing the abnormal state detected by the abnormality detection means;
Command receiving means for receiving a command from a user;
An error state notifying unit for notifying a user of an error state indicating that the fuel cell and the fuel cell related device have been stopped due to the abnormality detecting unit detecting the abnormal state;
When the abnormality detection unit detects the abnormal state, the control unit notifies the error state from the error state notification unit, and stores the abnormal state detected by the abnormality detection unit in the abnormality storage unit. To stop the operation of the fuel cell and the fuel cell-related equipment,
The control means, if the power failure detection means detects the power failure state of the power system when the abnormality detection means detects the abnormal state, the error state notified from the error state notification means. The user must set the state to be releasable using the command receiving means, and the power failure detection means must detect the power failure state of the power system when the abnormality detection means detects the abnormal state. For example, the error state notified from the error state notification unit is set to be unreleasable by the user using the command receiving unit,
If the abnormal condition is stored in the abnormality storage means and the operation of the fuel cell is stopped while the error state notified from the error condition notification means is not released, the control means The restart of the battery is prohibited, and the operation of the fuel cell is stopped in a state where the abnormal state is stored in the abnormality storage unit and the error state notified from the error state notification unit is released. The fuel cell power generator according to claim 1, wherein the fuel cell is allowed to restart. The abnormality detection means includes
When determining whether or not the fuel cell is in an abnormal state, the temperature of the reforming unit that generates the fuel gas mainly composed of hydrogen by steam reforming the raw fuel and the power generation reaction in the fuel cell The temperature of the combustion part for burning the fuel electrode exhaust gas discharged from the fuel electrode after being used to heat the reforming part, the temperature of the cooling water after cooling the cell, and the heat from the cooling water The temperature of the heating medium after recovering the temperature, the temperature of the steam generating section that generates steam to be supplied to the reforming section, the temperature of the fuel gas, the output voltage from the cell, and the fuel The temperature of the heat medium after recovering heat from the polar exhaust gas, the temperature of the shift section that converts carbon monoxide contained in the reformed gas generated in the reformer section into carbon dioxide, and the shift section Carbon monoxide remaining in the gas after the transformation treatment at The fuel cell according to claim 1 wherein at least one one will be determined to be the abnormal state to be a time threshold or non-power failure threshold power failure of the temperature of the oxidation unit for oxidizing the Power generation device.   5. The fuel cell power generator according to claim 1, wherein when the power failure detection unit detects the power failure state, the control unit operates so that the fuel cell is operated with a minimum generated power.

Images