JP2019110031A - Fuel cell system and operation method therefor - Google Patents

Abstract

To provide a reliable fuel cell system capable of accurately determining discharge abnormality of anode off-gas from a fuel gas circulation path via a discharge valve.SOLUTION: A fuel cell system comprises: an anode off-gas discharge path 7 that branches from a fuel gas circulation path 5 and has a tip opening to the atmosphere; a sensor 8 for measuring a concentration of impurities in anode off-gas; a discharge valve 9 that is provided on the anode off-gas discharge path 7 and opens/closes the anode off-gas discharge path 7; a first electrode 11 and second electrode 12 arranged so as to interpose the discharge valve 9 therebetween on the anode off-gas discharge path 7 and be capable of coming into contact with the anode off-gas; an insulation unit 10 provided on the anode off-gas discharge path 7 so as to insulate the first electrode 11 from the second electrode 12; a voltmeter 13 connected to the first electrode 11 and second electrode 12; and a controller 14 that determines abnormality in the case that a voltage measured by the voltmeter 13 at the time of opening the discharge valve 9 on the basis of a measured value of the sensor 8 does not become equal to or lower than a predetermined value.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fuel cell system that discharges an anode off gas containing a high concentration of impurities from a fuel gas circulation path for using the anode off gas discharged from the fuel cell as a fuel gas, and a method of operating the same.

  In a fuel cell system that generates electricity by supplying hydrogen as a fuel gas to the anode of a fuel cell using a polymer electrolyte membrane and air as an oxidant gas to the cathode, the anode off gas discharged from the fuel cell is circulated and used In this case, nitrogen permeates and accumulates from the cathode side to the anode side through the polymer electrolyte membrane and the output of the fuel cell system is reduced, so it is necessary to discharge the nitrogen accumulated on the anode side.

  If the anode off gas is discharged in a state where the hydrogen concentration in the anode off gas is high when the anode off gas is discharged, the hydrogen is excessively discharged and the power generation efficiency of the fuel cell system is reduced. In addition, if the hydrogen concentration is excessively low and then discharged, the output of the fuel cell system may be reduced or the catalyst layer on the anode side may be degraded.

  Therefore, as a conventional example of a fuel cell operating method for improving power generation efficiency while minimizing emitted hydrogen, for example, there is the one disclosed in Patent Document 1. FIG. 6 is a block diagram of a conventional fuel cell system disclosed in Patent Document 1. As shown in FIG.

  As shown in FIG. 6, the conventional fuel cell system 101 includes a fuel cell 102, a fuel gas supplier 103 for supplying fuel gas to the anode of the fuel cell 102, a fuel gas supply path 104, and the fuel cell 102. The fuel gas circulation path 105 for circulating the anode off gas not consumed to the fuel supply path, the circulation pump 106 for circulating the anode off gas in the fuel gas circulation path 105, and the impurities not used in the reaction in the fuel cell 102 An anode off gas exhaust path 107 for exhausting from 105 and a controller 113 are provided.

  Further, a first discharge valve 108 and a second discharge valve 109 downstream of the first discharge valve 108 are provided in the anode off gas discharge path 107, and the pressure between the first discharge valve 108 and the second discharge valve 109 is purged. The gas density is detected by the line pressure sensor 112, and the gas density in the anode off gas discharge path 107 is estimated by the time change of pressure, and the opening and closing of the first discharge valve 108 and the second discharge 109 are controlled based on the estimation result. Exhausting was to minimize the emitted hydrogen.

Unexamined-Japanese-Patent No. 2006-324058

  The prior art disclosed in Patent Document 1 is provided with a first discharge valve and a second discharge valve in the anode off gas discharge path, and the gas from the time change of the measured pressure between the first discharge valve and the second discharge valve The density is estimated. The gas density decreases as the hydrogen concentration increases, and increases as the hydrogen concentration decreases.

  In the conventional configuration, when the blockade by water occurs between the first discharge valve and the second discharge valve and the hydrogen concentration of the anode off gas becomes higher than the estimated hydrogen concentration, the hydrogen is excessively discharged. Power generation efficiency is reduced. On the other hand, when the hydrogen concentration of the anode off gas is lower than the estimated hydrogen concentration, the anode off gas containing impurities is not sufficiently discharged, and the hydrogen concentration in the anode off gas path remains low. The output decreases, or the catalyst layer on the anode side is degraded by impurities.

  As described above, in the above-described conventional configuration, when the blockade by water occurs between the first discharge valve and the second discharge valve, the anode off gas is different from the hydrogen concentration of the anode off gas and the estimated hydrogen concentration. There is a problem that it can not be determined whether the anode off gas is properly discharged due to excessive discharge or insufficient discharge.

  An object of the present invention is to solve the conventional problems, and it is an object of the present invention to provide a highly reliable fuel cell system capable of accurately determining whether anode off gas is properly discharged and its operation method.

  In order to solve the conventional problems, the fuel cell system of the present invention comprises a fuel cell, a fuel gas supply unit for supplying a fuel gas to an anode, and an anode off gas exhausted from the anode as a fuel gas supply path. A fuel gas circulation path for returning, an anode off gas discharge path branched from the fuel gas circulation path and having the tip open to the atmosphere, a discharge valve provided in the anode off gas discharge path to open and close the anode off gas discharge path, and contact with the anode off gas A second electrode disposed in the anode off-gas discharge path between the discharge valve and the tip of the anode off-gas discharge path, and one end connected to the first electrode The controller includes a voltmeter whose end is connected to the second electrode, and the controller is configured to control the concentration of impurities contained in the anode off gas to a predetermined concentration. If the voltage measured by the voltmeter does not fall below a predetermined value when the exhaust valve is opened before the exhaust valve is reached, it is determined that the anode off gas has an abnormality or the fuel cell system Informing the state or abnormality or stopping the operation.

  With this configuration, when the anode off gas discharge path is not clogged and discharge of the anode off gas is normally performed, the gas in contact with the first electrode and the gas in contact with the second electrode are used. Since the composition is the same, there is no difference in chemical potential between the electrodes.

  Since the difference in chemical potential is expressed as an electromotive force according to the Nernst equation, when the voltage between the electrodes is measured, the voltage shows a predetermined value or less. On the other hand, when clogging occurs in the discharge path, the chemical potential is different because the gas composition in contact with the first electrode and the gas composition in contact with the second electrode are different.

  Therefore, since the voltage measured between the electrodes does not fall below a predetermined value, it is possible to provide a highly reliable fuel cell system which can accurately determine whether the anode off gas is properly discharged.

  The fuel cell system according to the present invention can detect the gas composition on the basis of a change in voltage detected by a voltmeter, and can determine whether or not the discharge of the anode off gas is normally performed. As a result, the anode off gas can be properly discharged, so the fuel cell system can be made more reliable.

Block diagram of fuel cell system according to the first embodiment of the present invention Block diagram of anode off gas discharge path of fuel cell system according to the first embodiment of the present invention Flow chart showing an anode off gas discharge control process of the fuel cell system according to the first embodiment of the present invention The block diagram of the anode off-gas discharge path of the fuel cell system in Example 2 of Embodiment 1 of this invention Configuration diagram of anode off gas discharge path of fuel cell system according to Embodiment 2 of the present invention Block diagram of conventional fuel cell system

  According to a first aspect of the present invention, there is provided a fuel cell, a fuel gas supply device for supplying a fuel gas to the anode of the fuel cell, a fuel gas supply path for supplying the fuel gas to the anode, and an anode off gas discharged from the anode. A fuel gas circulation path for returning to the fuel gas supply path as a gas, an anode off gas discharge path branched from the fuel gas circulation path and having a tip open to the atmosphere, and a discharge valve provided in the anode off gas discharge path to open and close the anode off gas discharge path A first electrode disposed in contact with the anode off gas, a second electrode disposed in contact with the gas in the anode off gas exhaust path between the exhaust valve and the tip of the anode off gas exhaust path, and one end thereof A fuel cell system comprising a voltmeter connected to a first electrode and the other end connected to a second electrode, and a controller, the controller comprising: When the discharge valve is opened and the discharge valve is opened before the concentration of impurities contained in the do-off gas reaches the predetermined concentration, if the voltage measured by the voltmeter does not fall below the predetermined value, the discharge of the anode off gas is abnormal. It is a fuel cell system that determines that there is a condition or reports the state or abnormality of the fuel cell system, or stops operation.

  Thus, when the anode off gas is normally discharged, the composition of the gas in contact with the first electrode is the same as the composition of the gas in contact with the second electrode, so that the voltage is less than a predetermined value. Since the composition of the gas in contact with the first electrode is different from the composition of the gas in contact with the second electrode when discharge of the anode off gas is not normally performed, the voltage shows a predetermined value or more, It can be determined whether or not the offgas discharge is performed normally.

  According to a second aspect of the present invention, in the anode off gas discharge path of the first aspect, a portion on the fuel cell side with respect to the exhaust valve, or a portion on the exhaust valve and the fuel cell side as the first electrode, and a portion on the air open side with respect to the exhaust valve Alternatively, the discharge valve and the part on the air release side are used as the second electrode, and the first electrode and the second electrode are insulated.

  As a result, by integrating each electrode with the pipe instead of the individual parts, the device configuration can be simplified and the reliability can be improved.

According to a third aspect of the present invention, there is provided a fuel cell, a fuel gas supplier for supplying a fuel gas to the anode of the fuel cell, a fuel gas supply path for supplying the fuel gas to the anode, and an anode off gas exhausted from the anode. A fuel gas circulation path for returning to the fuel gas supply path as a gas, an anode off gas discharge path branched from the fuel gas circulation path and whose tip is open to the atmosphere, and an anode off gas discharge path provided in the anode off gas discharge path A valve, a first electrode disposed in contact with the anode off gas, and a second electrode disposed in contact with the gas in the anode off gas discharge path between the exhaust valve and the tip of the anode off gas discharge path; Is a method of operating a fuel cell system comprising a voltmeter connected to the first electrode and the other end connected to the second electrode, the anode being off If the voltage measured by the voltmeter does not fall below a predetermined value when the discharge valve is opened and the discharge valve is opened before the concentration of nitrogen contained in the gas reaches the predetermined concentration, the anode off gas is discharged It is determined that the fuel cell system has an abnormality, or the state or abnormality of the fuel cell system is notified, or the operation method of the fuel cell system is to stop the operation.

  Thus, when the anode off gas is being discharged normally, the composition of the gas in contact with the first electrode and the composition of the gas in contact with the second electrode are the same, so the voltage is less than a predetermined value. On the other hand, when the anode off gas is not properly discharged, the composition of the gas in contact with the first electrode and the composition of the gas in contact with the second electrode are different, and the voltage shows a predetermined value or more. According to the present invention, it is possible to provide a method of operating a fuel cell system capable of determining whether the discharge of anode off gas is normally performed. Furthermore, there is no concern that the reliability of the measurement results will be reduced, and the reliability of the fuel cell system can be increased.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited by the embodiments.

Embodiment 1
FIG. 1 is a block diagram of a fuel cell system according to Embodiment 1 of the present invention.

  FIG. 2 is a configuration diagram of an anode off gas discharge path of the fuel cell system according to Embodiment 1 of the present invention.

  FIG. 3 is a flowchart showing an anode off gas discharge control process of the fuel cell system according to Embodiment 1 of the present invention.

  As shown in FIGS. 1 and 2, the fuel cell system 1 of the present embodiment includes a fuel cell 2, a fuel gas supply device 3 for supplying hydrogen as a fuel gas to the anode of the fuel cell 2, and An oxidant gas supply unit 15 for supplying hydrogen as an oxidant gas to the cathode, a fuel gas supply path 4 for supplying hydrogen from the fuel gas supply unit 3 to the anode, and an anode off gas discharged from the anode for the fuel gas supply A fuel gas circulation path 5 for returning to the path 4, a circulation pump 6 provided in the fuel gas circulation path 5, an anode off gas discharge path 7 branched from the fuel gas circulation path 5 and open at the tip to the atmosphere, a fuel gas A sensor 8 provided in the circulation path 5 for measuring the concentration of impurities in the anode off gas, and an exhaust provided in the anode off gas exhaust path 7 for opening and closing the anode off gas exhaust path 7 9, an insulating portion 10 provided on the downstream side of the exhaust valve 9 and the insulating portion 10 in the anode off gas exhaust path 7, and an anode off gas on the upstream side of the exhaust valve 9 in the anode off gas exhaust path 7 A first electrode 11, a second electrode 12 disposed in contact with the anode off gas in the anode off gas discharge path 7 downstream of the discharge valve 9, and a voltmeter connected to the first electrode 11 and the second electrode 12 13 and a controller 14.

  Next, discharge control processing of the anode off gas by the fuel cell system 1 of the present embodiment configured as described above will be described based on the flowchart of FIG.

  First, in a state where the fuel cell 2 is generating electricity, the concentration of impurities contained in the anode off gas of the fuel gas circulation path 5 is determined using the sensor 8 (S01).

  Next, it is determined whether the concentration of impurities contained in the anode off gas of the fuel gas circulation path 5 reaches a predetermined upper limit concentration (S02). In the present embodiment, the predetermined upper limit concentration is 40%.

When the concentration of the impurities reaches the upper limit concentration, the discharge valve 9 is opened (S03), and the voltage measurement indicated by the voltmeter 13 is started (S04). If the concentration of impurities has not reached the upper limit concentration, S01 is performed again.
Return to

  Next, it is determined whether the voltage of the voltmeter 13 is equal to or more than a predetermined value (S05). The predetermined value is a voltage indicated when the composition of the gas in contact with the first electrode 11 and the composition of the gas in contact with the second electrode 12 is 0 V.

  If the voltage indicated by the voltmeter 13 is larger than the predetermined value in S05, it is determined that there is an abnormality in the discharge of the anode off gas, and the abnormality is notified (S06). Next, the discharge valve 9 is closed (S07), and the operation is stopped (S08).

  On the other hand, when the voltage indicated by the voltmeter 13 is equal to or less than the predetermined value, it is determined that there is no abnormality in the discharge of the anode off gas (S09). Next, it is determined whether or not the concentration of impurities in the anode off gas discharge path 7 has become equal to or less than a predetermined lower limit concentration (S10). In the present embodiment, the lower limit concentration is 10%.

  If the concentration of the impurities in the fuel gas circulation path 5 falls below the predetermined lower limit concentration, the discharge valve 9 is closed (S11), the discharge processing is ended, and the process returns to S01. If the concentration does not fall below the lower limit concentration, the process returns to S05 again. By performing such control, the concentration of impurities contained in the anode off gas can be accurately grasped, and appropriate processing can be performed.

  As described above, the fuel cell system 1 of the present embodiment includes the discharge valve 9 for opening and closing the anode off gas discharge passage 7 provided in the anode off gas discharge passage 7, and the downstream side of the discharge valve 9 in the anode off gas discharge passage 7. , An anode off gas discharge path 7, a first electrode 11 disposed in contact with the anode off gas on the upstream side of the discharge valve 9, a discharge valve 9, an insulator 10 and an anode off gas discharge path 7. A second electrode 12 disposed in contact with the gas in the anode off-gas discharge path 7 between the first electrode 11 and the tip of the second electrode 12; and a voltmeter 13 having one end connected to the first electrode 11 and the other end connected to the second electrode 12; The fuel cell system 1 is provided with the controller 14 and the discharge of the anode off gas is normal by detecting the gas composition by the change of the voltage detected by the voltmeter 13 It is possible to determine whether or not made.

  In addition, since the difference between the hydrogen concentration of the anode off gas and the estimated hydrogen concentration becomes smaller compared to the method of detecting the discharge of the anode off gas by the flow rate or pressure, the reliability of the measurement result due to the blockage of the flowmeter or pressure gauge The fuel cell system 1 can be operated with high reliability without concern that the sex may be reduced.

  Although hydrogen is used as the fuel gas in the present embodiment, it is not limited to hydrogen gas, and any gas may be used as long as it can be implemented in the present embodiment.

  In the present embodiment, any material may be selected as the material of the voltmeter as long as it has corrosion resistance to gas.

  In the present embodiment, after it is determined that there is an abnormality, the fuel cell system 1 reports an abnormality and then stops the operation. However, if the fuel cell system 1 determines that there is an abnormality or there is an abnormality After the determination, the fuel cell system 1 may be notified of an abnormality.

  Further, although the impurity gas sensor is used as the sensor 8 in the present embodiment, it may be the sensor 8 that directly detects the hydrogen gas concentration.

Hereinafter, more specific contents of the first embodiment will be described using an example. The present invention is not limited by this embodiment.

Example 1
Using the fuel cell system 1 shown in FIGS. 1 and 2, in the anode off gas discharge path 7, as shown in detail in FIG. 2, the discharge valve 9, the insulator 10, the first electrode 11, and the second electrode 12 are installed. It was composition. Further, the voltage between the first electrode 11 and the second electrode 12 was measured by the voltmeter 13.

  The insulating portion 10 is a gasket made of an insulating material such as PTFE (TOMBO NO. 9000 made by Nichias), and an insulating bolt is used for connection with the discharge valve 9, and the first electrode 11, the discharge valve 9 and the second electrode Insulated from 12.

  For the first electrode 11 and the second electrode 12, a 3 mm square gold plate that can be installed in the anode off gas piping path was used. A signal line for measuring a voltage from the gold plate to a voltmeter was taken out and connected to the voltmeter 13.

  The voltmeter 13 used digital multimeter CDM-2000D made from COSTOM CORPORATION.

  In this configuration, the voltmeter showed 77.5 mV as a result of measuring the voltage in advance as hydrogen in contact with the first electrode 11, gas in contact with the second electrode 12, and air. Further, the gas in contact with the first electrode 11 was pure hydrogen, and the gas in contact with the second electrode 12 was also pure hydrogen, and the voltage was measured in advance. As a result, the voltmeter showed 0 mV.

  The nitrogen concentration of the sensor 8 was measured using an ultrasonic gas concentration meter (US100 manufactured by Daiichi Hakken Co., Ltd.).

  First, hydrogen as a fuel gas and air as an oxidant gas were supplied to the fuel cell 2, and the anode off gas was circulated to start power generation. When the nitrogen concentration of the sensor 8 indicates 40%, the discharge valve 9 is actuated to discharge the anode off gas. At that time, the voltmeter 13 showed 0 mV. Thereafter, when the nitrogen concentration of the sensor 8 showed 10%, it was confirmed that the discharge valve 9 was closed.

  As a result, when the gas contacting the first electrode 11 and the second electrode 12 is the same, it can be confirmed that the discharge process of the anode off gas can be normally performed.

(Example 2)
FIG. 4 is a block diagram of the anode off gas discharge path of the fuel cell system 1 of the second embodiment. As shown in FIG. 4, the same as in Example 1 except that the insulating part 10 is disposed not on the discharge valve 9 and the atmosphere open side but on the anode off gas discharge path 7 on the fuel cell 2 side of the discharge valve 9 The voltage at the time of anode off gas discharge was measured in the same manner as in Example 1.

  First, hydrogen was supplied as fuel cell 2 fuel gas and air was supplied as oxidant gas, and the anode off gas was circulated to start power generation. When the nitrogen concentration of the sensor 8 indicates 40%, the discharge valve 9 is actuated to discharge the anode off gas. At that time, the voltmeter 13 showed 0 mV. Thereafter, when the nitrogen concentration of the sensor 8 showed 10%, it was confirmed that the discharge valve 9 was closed.

  As a result, when the gas contacting the first electrode 11 and the second electrode 12 is the same, it can be confirmed that the discharge process of the anode off gas can be normally performed.

Second Embodiment
FIG. 5 shows a configuration diagram of an anode off gas discharge path of the fuel cell system of Embodiment 2. As shown in FIG.

  The present embodiment is the same as Embodiment 1 except for the configuration of the anode off gas discharge path shown in FIG.

  As shown in FIG. 5, in the anode off gas discharge path 7, one terminal of the voltmeter 13 is connected to a pipe of the anode off gas discharge path 7 closer to the fuel cell 2 than the discharge valve 9 to form a first electrode 11; The terminal was connected to the pipe of the anode off gas discharge path 7 on the air release side of the discharge valve 9 and used as the second electrode 12.

  The connection between the first electrode 11 and the discharge valve 9, and the connection between the second electrode 12 and the discharge valve 9 are both insulating pipes between pipings using insulating gaskets (TOMBO NO. 9000 made by Nichias) and insulating bolts. Provided. The pipe was a pipe made of SUS304, which is a conductive material. In this configuration, the voltage at the time of discharging the anode off gas was measured in the same manner as in Example 1.

  First, hydrogen as a fuel gas and air as an oxidant gas were supplied to the fuel cell 2, and the anode off gas was circulated to start power generation. When the nitrogen concentration of the sensor 8 indicates 40%, the discharge valve 9 is actuated to discharge the anode off gas. At that time, the voltmeter was 0 mV. Thereafter, when the nitrogen concentration of the sensor 8 showed 10%, it was confirmed that the discharge valve 9 was closed.

  As a result, when the gas contacting the first electrode 11 and the second electrode 12 is the same, it can be confirmed that the discharge process of the anode off gas can be normally performed.

(Modification)
In the structure of Example 2, water was previously put in the discharge valve 9 to be in a closed state, and the voltage was measured by the voltmeter 13 at the time of anode off gas discharge. First, hydrogen as a fuel gas and air as an oxidant gas were supplied to the fuel cell 2, and the anode off gas was circulated to start power generation.

  When the nitrogen concentration of the sensor 8 indicates 40%, the discharge valve 9 is actuated to discharge the anode off gas. After one minute, the voltmeter 13 showed 5 mV and at the same time the controller's warning buzzer was activated.

  Thereby, when the gas which contacts the 1st electrode 11 and the 2nd electrode 12 differs, it has checked that an alarm could be notified.

  As described above, the fuel cell system of the present invention can accurately determine whether the anode off gas is properly discharged and has high reliability. Therefore, a polymer electrolyte membrane is used as the fuel cell electrolyte, and the fuel cell system is discharged from the fuel cell The fuel cell system according to the present invention is suitable for applications requiring reliability in a fuel cell system in which an anode off gas containing a high concentration of impurities is discharged through a discharge valve from a fuel gas circulation path for using the anode off gas as fuel gas.

DESCRIPTION OF SYMBOLS 1 fuel cell system 2 fuel cell 3 fuel gas supply apparatus 4 fuel gas supply path 5 fuel gas circulation path 6 circulation pump 7 anode off gas exhaust path 8 sensor 9 exhaust valve 10 insulating part 11 first electrode 12 second electrode 13 voltmeter 14 Controller 15 Oxidizer gas feeder

Claims (3)

  A fuel cell, a fuel gas supply device for supplying a fuel gas to the anode of the fuel cell, a fuel gas supply path for supplying the fuel gas to the anode, and an anode off gas discharged from the anode The fuel gas circulation path for returning to the fuel gas supply path, the anode off gas discharge path branched from the fuel gas circulation path and having the tip open to the atmosphere, and the anode off gas discharge path provided on the anode off gas discharge path And a first electrode disposed in contact with the anode off gas, and a gas in the anode off gas exhaust path between the exhaust valve and the tip of the anode off gas exhaust path. A second electrode, a voltmeter having one end connected to the first electrode and the other end connected to the second electrode, and a controller The controller is configured to open the discharge valve before the concentration of impurities contained in the anode off gas reaches a predetermined concentration and to measure the voltage by the voltmeter when the discharge valve is opened. A fuel cell system that determines that there is an abnormality in the discharge of the anode off gas, reports a state or abnormality of the fuel cell system, or stops operation if the obtained voltage does not fall below a predetermined value.   In the anode off gas discharge path, a portion closer to the fuel cell than the discharge valve, or a portion closer to the fuel cell than the discharge valve and the discharge valve is a first electrode, a portion closer to the atmosphere than the discharge valve, or the discharge valve 2. The fuel cell system according to claim 1, wherein a portion on the air release side of the exhaust valve is used as a second electrode, and the first electrode and the second electrode are insulated.   A fuel cell, a fuel gas supply device for supplying a fuel gas to the anode of the fuel cell, a fuel gas supply path for supplying the fuel gas to the anode, and an anode off gas discharged from the anode The fuel gas circulation path for returning to the fuel gas supply path, the anode off gas discharge path branched from the fuel gas circulation path and having the tip open to the atmosphere, and the anode off gas discharge path provided on the anode off gas discharge path And a first electrode disposed in contact with the anode off gas, and a gas in the anode off gas exhaust path between the exhaust valve and the tip of the anode off gas exhaust path. And a voltmeter having one end connected to the first electrode and the other end connected to the second electrode. In the method of operating a fuel cell system, when the discharge valve is opened and the discharge valve is opened before the concentration of impurities contained in the anode off gas reaches a predetermined concentration, the voltage measured by the voltmeter is a predetermined value. When it does not become below, it determines with there being abnormality in discharge of the said anode off gas, or reports the state or abnormality of the said fuel cell system, or the operating method of the fuel cell system which stops operation | movement.

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