WO2008007740A1

WO2008007740A1 - Fuel cell system

Info

Publication number: WO2008007740A1
Application number: PCT/JP2007/063912
Authority: WO
Inventors: Toyokazu Baika
Original assignee: Toyota Jidosha Kabushiki Kaisha
Priority date: 2006-07-12
Filing date: 2007-07-12
Publication date: 2008-01-17
Also published as: JP2008021500A

Abstract

A fuel cell system having an oxidant gas flow path running via an air electrode of a fuel cell, sensors provided in the oxidant gas flow path, and a chemical filter placed in the oxidant gas flow path, on the upstream side of the sensors, and adsorbing impurities contained in the oxidant gas. Since the impurities are removed by the chemical filter, the influence of the impurities to each of the sensors arranged on the downstream side of the chemical filter can be suppressed to maintain the accuracy of the sensors.

Description

Specification

Fuel cell system

Technical field

[0001] The present invention relates to a fuel cell system.

Background art

[0002] Sulfur compounds (for example, SO) from air supplied as an oxidant gas to the air electrode of a fuel cell

2 and H S) and nitrogen oxides (NOx) to remove impurities that are harmful to fuel cells.

2

Therefore, there is a chemical filter arranged on the supply path of the oxidant gas to the fuel cell (for example, Patent Document 1). The chemical filter is composed of activated carbon, etc., and adsorbs and removes impurity components.

Patent Document 1: Japanese Patent Laid-Open No. 2005-116353

Disclosure of the invention

Problems to be solved by the invention

[0003] Generally, various sensors such as a pressure sensor and a temperature sensor provided to adjust the supply amount of the oxidant gas to the fuel cell and the temperature thereof are provided on the supply path of the oxidant gas.

[0004] Conventionally, a sensor such as a pressure sensor or a temperature sensor is disposed upstream of the chemical filter, which is not the case where a chemical filter is disposed in consideration of the relationship with various sensors disposed in the oxidant gas supply path. There was.

[0005] In this case, the sensor force disposed on the upstream side of the chemical filter is exposed to impurity components (for example, SO and H 2 S) contained in the oxidant gas for a long time, and the impurities adhere to the sensor, and the sensor

twenty two

There was a risk of lowering the detection accuracy. In addition, the moisture contained in the oxidant gas may act on impurities attached to the sensor to generate acid, which may corrode the sensor.

[0006] An object of the present invention is to provide a fuel cell system capable of suppressing the detection accuracy of a sensor disposed on an oxidant gas flow path from being deteriorated due to the influence of impurities or the sensor from being deteriorated. Is to provide.

Means for solving the problem The present invention adopts the following configuration in order to solve the above-described problems.

That is, the present invention provides an oxidant gas flow path for introducing an oxidant gas into a force sword electrode of a fuel cell and discharging exhaust gas from the force sword electrode,

A plurality of sensors provided on the oxidant gas flow path;

An adsorber including a chemical filter that is disposed upstream of the plurality of sensors in the oxidant gas flow path and adsorbs impurities contained in the oxidant gas.

A fuel cell system including

According to the present invention, since the impurities are removed by the chemical filter, it is possible to suppress the action of the impurities on each of the plurality of sensors arranged on the downstream side, thereby maintaining the accuracy of the sensor and preventing the corrosion of the sensor. Can be achieved.

[0010] Preferably, the fuel cell system according to the present invention further includes a dust filter disposed on the upstream side of the chemical filter in the oxidant gas flow path.

[0011] In this case, since the particulate matter contained in the oxidant gas can be removed by the dust filter, the influence of the particulate matter on the sensor can be reduced. Further, when the oxidant gas passes through the dust filter, the moisture in the oxidant gas that reaches the chemical filter can be reduced, and the influence of moisture on the chemical filter can be suppressed.

[0012] Preferably, the fuel cell system according to the present invention comprises a measuring means for measuring the amount of oxidant gas that has passed through the adsorber,

A concentration sensor that detects the concentration of the impurities contained in the oxidant gas that has passed through the adsorber;

Estimating means for estimating the amount of the impurity adsorbed on the chemical filter based on the measured amount of the oxidant gas, the detected concentration, and a ratio obtained from the adsorption efficiency of the chemical filter;

Output control means for outputting a signal when a cumulative value of the amount of impurities exceeds a predetermined value;

Further included.

[0013] By doing so, a signal is output when the amount of impurities adsorbed on the chemical filter reaches a predetermined value, for example, to inform the outside that the chemical filter has reached the end of its life. can do.

[0014] Further, the fuel cell system according to the present invention can be configured such that the adsorber is provided upstream of all sensors provided on the oxidant gas flow path.

[0015] With this configuration, impurities contained in the oxidant gas are removed by the chemical filter, so that it is possible to prevent impurities from adhering to all sensors and affecting their measurement accuracy.

The invention's effect

[0016] According to the present invention, there is provided a fuel cell system capable of suppressing the detection accuracy of a sensor arranged on the flow path of an oxidant gas from being lowered due to the influence of impurities or the sensor from being deteriorated. Can be provided.

Brief Description of Drawings

FIG. 1 is a diagram showing a configuration example of a fuel cell system according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an example of chemical filter life determination processing by the ECU.

Explanation of symbols

1 ... Fuel cell

2 "• Solid polymer electrolyte membrane

3.'Fuel electrode

4 •• Air electrode

5 ... 'Fuel electrode side separator

6 ... 'Air electrode side separator

11 ... Air intake pipe

12 ... Dust filter

13 Chemical filter

14, 19, 22, 25, 27, 30… Piping

15 ... Air flow meter

16, 29 ... Pressure sensor

17, 24, 26 ... Temperature sensor 18 'Concentration sensor

20 'air pump

21 · Motor

23 · Intercooler

28 ·, Regulator

31 'Muffler

32ECU

33 • Warning light

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The configuration of the embodiment is an exemplification, and the present invention is not limited to the configuration of the embodiment.

FIG. 1 is a diagram showing a configuration example of a fuel cell system in an embodiment of the present invention. This fuel cell system is mounted on a moving body (for example, a vehicle). As the fuel cell 1 in FIG. 1, a polymer electrolyte fuel cell (PEFC) is applied. The fuel cell 1 is composed of a cell stack formed by stacking a plurality of cells (however, FIG. 1 schematically shows the configuration of a single cell in the fuel cell 1).

The cell includes a solid polymer electrolyte membrane 2, a fuel electrode (anode) 3 and an air electrode (oxidizer electrode: force sword electrode) 4 that sandwich the solid polymer electrolyte membrane 2 on both sides, and a fuel electrode 3. And a fuel electrode side separator 5 and an air electrode side separator 6 sandwiching the air electrode 4.

The fuel electrode 3 has a diffusion layer and a catalyst layer. A fuel (fuel gas) containing hydrogen such as hydrogen gas or hydrogen rich gas is supplied to the fuel electrode 3 by a fuel supply system. The fuel gas supplied to the fuel electrode 3 is diffused in the diffusion layer and reaches the catalyst layer. In the catalyst layer, hydrogen in the fuel gas is separated into protons (hydrogen ions) and electrons. Hydrogen ions move to the air electrode 4 through the solid polymer electrolyte membrane 2, and electrons move to the air electrode 4 through an external circuit (not shown).

On the other hand, the air electrode 4 has a diffusion layer and a catalyst layer. An oxidant gas such as air is supplied to the air electrode 4 by an oxidant supply system. The oxidant gas supplied to the air electrode 4 is diffused in the diffusion layer and reaches the catalyst layer. In the catalyst layer, oxidant gas and solid polymer electrolyte membrane 2 are Water is generated through a reaction between hydrogen ions that have passed through the air electrode 4 and electrons that have reached the air electrode 4 through an external circuit.

[0024] Electrons passing through an external circuit during the reaction in the fuel electrode 3 and the air electrode 4 as described above are used as electric power for a load connected between both terminals of the fuel cell 1.

FIG. 1 shows an oxidant gas flow path that passes through the air electrode 4 of the fuel cell 1. The oxidizing agent gas flow path includes an air electrode 4 of the fuel cell 1, an oxidant supply system provided upstream of the air electrode 4, and an oxidant discharge system provided downstream of the air electrode 4. Consists of

In FIG. 1, the oxidant supply system includes a dust filter 12 into which outside air (air) taken in from the air intake pipe 11 is introduced, and a chemical filter 13 disposed on the downstream side of the dust filter 12. I have. The inlet of the air intake pipe 11 is arranged so as to open toward the outside air inlet provided in the vehicle. In the air introduced into the air intake pipe 11, impurity components (sulfur compounds (eg, SO and H 2 S), nitrogen compounds, etc.)

twenty two

), Liquid, solid (granular, powdery).

[0027] The dust filter 12 removes particulate matter in the air. The chemical filter 13 is made of activated carbon or the like, and contains impurity components (sulfur compounds (eg, SO and H 2 S), nitrogen compounds) contained in the air.

twenty two

Etc.) is removed by adsorbing it to itself.

[0028] The dust filter 12 and the chemical filter 13 are configured as one unit having both. In the example shown in FIG. 1, the dust filter 12 and the chemical filter 13 are stored in the storage container 13A joined so that the air intake pipe 11 and the pipe 14 communicate with each other inside, and are received from the air intake pipe 11. The air introduced into the container 13A passes through the dust filter 12 and then passes through the chemical filter 13 and is sent out into the pipe 14. The storage container 13A functions as an adsorber that stores a chemical filter.

[0029] In the container 13A, the dust filter 12 and the chemical filter 13 may be disposed in contact with each other, or may be disposed with a distance therebetween. Further, the dust filter 12 and the chemical filter 13 may be arranged in different storage containers. In this case, the two storage containers may be integrally formed, and the internal space of each storage container may be communicated. The internal space of each storage container communicates with the internal space of the pipe. It may be configured as follows.

The air that has passed through the chemical filter 13 is sucked into the air flow meter 15 connected to the pipe 14 via the pipe 14. The pipe 14 is provided with a pressure sensor 16 for detecting the pressure (air pressure) in the pipe 14 and a temperature sensor 17 for detecting the temperature in the pipe 14. Further, the pipe 14 is provided with a concentration sensor 18 for detecting the concentration of a specific impurity component contained in the air that has passed through the chemical filter 13.

[0031] The air flow meter 15 measures the amount of intake air (the amount of air passing through itself). The air that has passed through the air flow meter 15 is introduced into an air pump (air conditioner) 20 connected via a pipe 19. The air pump 20 operates by driving the motor 21 and sends air to the fuel cell 1 side. The air pump 20 is connected to the intercooler 23 through the pipe 22, and the air sent out from the air pump 20 is introduced into the intercooler 23 through the pipe 22. The pipe 22 is provided with a temperature sensor 24 that detects the temperature in the pipe 22 (the temperature of the air flowing through the pipe 22).

The intercooler 23 cools the air introduced therein and discharges it to the pipe 25. The pipe 25 is connected to the oxidant gas inlet of the fuel cell 1. The pipe 25 is provided with a temperature sensor 26 that detects the temperature in the pipe 25 (the temperature of the air discharged from the intercooler 23). The air introduced into the oxidant gas inlet diffuses to the air electrode 4 through the flow path provided in the air electrode side separator 6. The air that has passed through the air electrode 4 is discharged as an exhaust gas from the oxidant gas outlet of the fuel cell 1 to the outside.

In FIG. 1, the oxidant discharge system is configured as follows. A pipe 27 is connected to the oxidant gas outlet of the fuel cell 1, and the pipe 27 is connected to a regulator (back pressure adjusting valve) 28. The pipe 27 is provided with a pressure sensor 29 that detects the pressure in the pipe 27. The regulator 28 adjusts the back pressure of the air pump 20 by changing the opening of the valve. A muffler 31 is connected to the regulator 28 via a pipe 30, and the air that has passed through the muffler 31 is discharged into the outside air.

[0034] The fuel cell system includes an ECU (Electronic Control Unit: computer) 32 as a control system (control means) for controlling the oxidant supply system and the oxidant discharge system described above. The ECU 32 is implemented by a processor such as a CPU (Central Processing Unit). An input / output interface (αζο) and the like between a program to be executed and a memory (storage device) that stores data used when the program is executed, a sensor, and the like are also configured.

The ECU 32 receives output signals from the air flow meter 15, pressure sensor 16, temperature sensor 17, concentration sensor 18, temperature sensor 24, temperature sensor 26, and pressure sensor 29 described above. The ECU 32 executes the program stored in the CPU power memory, and based on the output signals from the air flow meter 15 and each sensor, the operation of the air pump 20, the air cooling capacity by the intercooler 23, and the opening of the regulator 28 Control the degree.

The ECU 32 measures the amount of oxidant gas (air) supplied to the fuel cell using the output signal from the air flow meter 15 and the sensor output signals from the pressure sensor 16 and the temperature sensor 17. That is, the air flow meter 15 provides an electric signal corresponding to the intake air amount to the ECU 32 as an output signal. The electric signal given at this time indicates the amount of air under atmospheric pressure and temperature conditions as predetermined standards. In contrast, air density depends on pressure and temperature. Therefore, the ECU 32 corrects the amount of air obtained from the air flow meter 15 with the pressure and temperature received from the pressure sensor 16 and the temperature sensor 17. In this way, the ECU 32 measures an accurate air amount. The measured air amount is used, for example, for controlling the amount of air supplied to the fuel cell 1 by the air pump 20.

Further, the ECU 32 controls the operation of the air pump 20 using an output signal from the temperature sensor 24 (temperature in the pipe 22). That is, the ECU 32 monitors the temperature of the air discharged (discharged) from the air pump 20 using the output signal from the temperature sensor 24. If the temperature of the exhaust air becomes a predetermined value or more, it means that an excessive load is applied to the air pump 20, and if such a state continues, the air pump 20 may break down. For this reason, when the temperature reaches a predetermined value or more, the ECU 32 gives a control signal to the motor 21 to reduce the rotation amount of the air pump 20 or stop the operation of the air pump 20.

Further, the ECU 32 controls the cooling capacity of the intercooler 23 using an output signal from the temperature sensor 26 (temperature in the pipe 25). The operating temperature of the fuel cell 1 suitable for power generation is determined, and if the fuel cell 1 is heated more than necessary by the air supplied to the fuel cell 1, there is a possibility that proper power generation of the fuel cell 1 may be hindered. The ECU 32, for example, gives a control signal to the intercooler 23 when the temperature of the air from which the intercooler 23 power is also discharged exceeds a predetermined value. The cooling capacity of the intercooler 23 is increased so that air below a predetermined value is supplied to the fuel cell 1. For example, if the intercooler 23 is air-cooled, the rotation amount of the fan included in the intercooler 23 is increased by a control signal, the flow rate of cooling air by the fan is increased, and the air (oxidant gas) passing through the intercooler 23 is increased. Ensure that heat dissipation is promoted.

Further, the ECU 32 controls the opening degree (back pressure) of the regulator 28 using the output signal from the pressure sensor 29 (pressure in the pipe 27). For example, the ECU 32 monitors the pressure in the pipe 27 received from the pressure sensor 29, and if the pressure (back pressure) exceeds a predetermined value (upper limit value), it gives a control signal to the regulator 28 to determine its opening degree. Increase the back pressure. Alternatively, when the pressure falls below a predetermined value (lower limit value), the ECU 32 gives a control signal to the regulator 28 to reduce its opening and increase the back pressure. The ECU 32 performs the back pressure control as described above according to the power generation amount of the fuel cell 1 so that proper operation is performed.

Further, the fuel cell system shown in FIG. 1 has a configuration that detects the life of the chemical filter 13 and outputs an alarm (corresponding to “signal” of the present invention). That is, the ECU 32 determines the amount of air obtained from the output signal force of the air flow meter 15, the pressure sensor 16 and the temperature sensor 17, the concentration of impurity components in the air in the pipe 14 obtained by the concentration sensor 18, and the chemical filter 13. Based on the ratio obtained from the trap efficiency (adsorption efficiency), the accumulated amount (accumulated amount) of the impurity component adsorbed on the chemical filter 13 is estimated (calculated), and when this accumulated amount exceeds the predetermined value, An alarm is output as the chemical filter 13 has reached the end of its service life (replacement time).

FIG. 2 is a flowchart showing a life determination process of the chemical filter 13 realized by executing a program in the ECU 32. The process shown in FIG. 2 can be started when, for example, the operation of the air pump 20 is turned on.

[0042] As preconditions for the following processing, the air amount, pressure, temperature, and concentration based on the output signals from the air flow meter 15 and the sensors 16, 17 and 18 are the air amount data, pressure data, Temperature data and concentration data are recorded (stored) in memory as needed. In the following steps, the ECU 32 reads out necessary data from the memory, and calculates Q1, Tl, PI, and G1, which will be described later, with temporal synchronization. That is, there is a time lag between the measurement and recording of air volume, temperature, pressure, and concentration and the calculations described in the following steps. [0043] When the processing is started, the ECU 32 takes in an output signal (air flow meter signal: air amount data) of the air flow meter 15, and obtains an intake air amount Q1 per unit time (step Sl). The intake air amount Q1 is stored in a work area of a memory included in the ECU 32.

[0044] Next, the ECU 32 takes in an output signal (air temperature signal: temperature data) from the temperature sensor 17, and obtains an air temperature T1 of the air amount Q1 obtained in step S1 (step S2). The air temperature T1 is stored in the work area of the memory included in the ECU 32.

Next, the ECU 32 takes an output signal (air pressure signal: pressure data) from the pressure sensor 16 and obtains the air pressure (air pressure) P1 of the air amount Q1 obtained in step S1 (step 1 S 3). The air pressure P1 is stored in a work area of a memory included in the ECU 32.

[0046] Next, the ECU 32 takes in an output signal (concentration signal: concentration data) from the concentration sensor 18, and a certain type of impurity contained in the air of the air amount Q1 obtained in step S1 ( Obtain the concentration G1 of impurity X (step S4). The concentration Gl is stored in the memory area of the memory included in the ECU 32.

Next, the ECU 32 performs air flow rate correction calculation (step S5). That is, the ECU 32 calculates the intake air amount Q2 (air flow rate: correction value) Q2 obtained by correcting the intake air amount Q1 stored in the work area with the air temperature T1 and air pressure P1 stored in the work area, and the work area To store.

Next, the ECU 32 calculates a passing impurity amount (step S6). That is, the ECU 32 multiplies the intake air amount Q2 and the concentration G1 stored in the work area, thereby passing through the chemical filter 13 and passing through the chemical filter 13 into the pipe 14. The amount of impurity X that has arrived is calculated as passing impurity amount G2, and stored in the work area.

Next, the ECU 32 calculates a cumulative amount of passing impurities (step S7). That is, the ECU 32 reads the value of the accumulated amount of passing impurities G3 stored in the nonvolatile memory (storage means) included in the ECU 32, and calculates the amount of passing impurities G2 stored in the work area to the value of G3. Then, a new accumulated amount of passing impurities G3 is calculated, and the new accumulated amount of passing impurities G3 is stored in the nonvolatile memory (overwriting the value of G3) and stored in the work area.

[0050] The accumulated amount of passing impurities G3 stored in the non-volatile memory is configured to be set to zero when an unused chemical filter 13 is newly set. Each time step 7 is executed, the amount of passing impurities G2 is added to the value of G3. As described above, the accumulated amount of impurities G3 indicates the accumulated amount of impurities X that have passed through the storage container 13A (adsorber) while the same chemical filter 13 is being used.

[0051] Next, the ECU 32 calculates the trap impurity accumulation amount (step S8). Here, the trap efficiency with respect to the impurity X by the chemical filter 13, that is, the ratio at which the chemical filter 13 is adsorbed when a certain amount of the impurity X passes through the storage container 13 A is determined in advance by an experiment or the like. It has been demanded. From this trapping efficiency, the amount of impurity X adsorbed (trapped) by the chemical filter 13 when a certain amount of impurity X passes through the container 13A (referred to as M) and the container 13A without being trapped. The ratio (M: N) to the amount of impurities X passing through (assuming N) is obtained.

[0052] On the non-volatile memory (storage means) included in the ECU 32, for example, the value of M when the value of N is 1 is stored in advance. The ECU 32 reads the value of M from the non-volatile memory and multiplies the accumulated amount of passing impurities G3 (calculates the ratio) so that the accumulated amount of trapped impurities G4 to the accumulated amount of trapped impurities G3 (adsorbed by the chemical filter 13). The amount of impurities X) is calculated and stored in the work area. Thus, the trap impurity accumulation amount G4 is determined based on the trap efficiency.

Next, the ECU 32 performs filter life determination (step S9). That is, the ECU 32 determines whether or not the trap impurity accumulation amount G4 stored in the work area is equal to or less than a predetermined value (determination value GO) stored in advance in the nonvolatile memory. The judgment value GO indicates the cumulative amount of trapped impurities that can be judged to have reached the end of the life of the chemical filter 13 specified through experiments and the like.

[0054] When the trapped impurity accumulation amount G4 is equal to or smaller than the determination value GO (S9; YES), the process proceeds to step S11. On the other hand, when the trap impurity accumulated amount G4 exceeds the determination value GO (S9; NO), the ECU 32 performs an alarm output process (step S10).

For example, as shown in FIG. 1, a warning lamp 33 is connected to the ECU 32. The warning lamp 33 is turned off when the trapped impurity accumulation amount G4 is not more than the judgment value GO. In step S10, the E CU 32 gives a warning signal to the warning lamp 33 and turns on the warning lamp 33. In this way, when the ECU 32 outputs an alarm, the fuel filter system user (vehicle user) has reached the end of the life of the chemical filter 13 (it is time to replace it). Can be notified.

[0056] When the warning lamp 33 is turned on, the lighting state is maintained unless a special operation such as a light-off switch operation by the user is performed (except for the power-off state). When step S10 ends, the process returns to step S1.

On the other hand, when the process proceeds to step S11, the ECU 32 determines whether or not the air pump 20 is turned off. When the air pump 20 is on (Sl 1; NO), the process returns to step S1, and when it is off (S11; YES), the life determination process ends.

[0058] In the fuel cell system according to the present embodiment, the chemical filter 13 includes a plurality of sensors (pressure sensor 16) (which are arranged in the oxidant gas flow path) that constitute an oxidant supply system and an oxidant discharge system. , Temperature sensor 17, concentration sensor 18, temperature sensor 24, temperature sensor 26, and pressure sensor 29) are arranged upstream of all of them. Thereby, since the impurity component contained in the air is removed by the chemical filter 13, it is prevented that the impurity component is attached to each sensor and affects the measurement accuracy. Further, since the chemical filter 13 is provided on the upstream side of the air flow meter 15! /, It is possible to suppress the impurity component from affecting the intake air amount detection of the air flow meter 15.

In addition, a dust filter 12 is provided on the upstream side of the chemical filter 13. Since particulate matter in the air is removed by the dust filter 12, it is possible to prevent the particulate matter from affecting the measurement accuracy of each sensor flow meter 15. Further, since the dust filter 12 is arranged upstream of the chemical filter 13, moisture in the air stays in the dust filter 12, so that the chemical filter 13 is connected directly to the air intake pipe 11. In addition, the amount of moisture introduced into the chemical filter 13 is reduced. Thereby, it is possible to suppress moisture from affecting the adsorption function of the chemical filter 13. In addition, since the amount of water discharged downstream of the chemical filter 13 is reduced, the moisture in the air acts on impurities attached to the sensor and the air flow meter 15 to generate an acid, and this acid is generated in the sensor air flow. One meter 15 can be prevented from corroding.

Furthermore, according to the present embodiment, the air flow meter 15 functions as a measurement unit, the concentration sensor 18 functions as a detection unit, and the ECU 32 functions as an estimation unit and an output control unit. The amount of adsorption is accurately estimated and the key is Rahm can be put out.

In the process shown in FIG. 2, the order of steps S1, S2, S3, and S4 is arbitrary. Further, the concentration sensor 18 is prepared for each type of impurity for which the cumulative amount is to be calculated. However, when a plurality of types of impurities can be shared by a single concentration sensor, the concentration of the plurality of types of impurities is detected by a single concentration sensor. The processing shown in Fig. 2 can be configured to be executed in parallel for each type of impurity.

[0062] Further, instead of the warning lamp 33, a display device may be prepared so that the display device indicates that the life (replacement time) has come. Also, instead of or in addition to the warning light 33 and the display device, the ECU 32 may output a sound (alarm sound) to a warning buzzer or the like!

[0063] Alternatively, instead of a configuration in which the chemical filter 13 is replaced according to its life, a heating unit such as a heater is provided around the chemical filter 13, and the ECU 32 controls the operation of the heating unit, so that the chemical filter 13 The heat regeneration process may be performed.

[0064] Further, the fuel cell system according to the present invention can be applied not only to mounting on a vehicle but also to a fuel cell fixedly mounted. The type of fuel cell is not limited to PEFC.

Claims

The scope of the claims

[1] An oxidant gas flow path for introducing an oxidant gas into the power sword pole of the fuel cell and discharging exhaust gas as much as possible;

A plurality of sensors provided on the oxidant gas flow path;

Including fuel cell system.

[2] The oxidant gas flow path further includes a dust filter disposed upstream of the chemical filter.

The fuel cell system according to claim 1.

[3] Measuring means for measuring the amount of oxidant gas that has passed through the adsorber;

The fuel cell system according to claim 1, further comprising:

[4] The adsorber is provided on the upstream side of all sensors provided on the oxidant gas flow path.

The fuel cell system according to any one of claims 1 to 3.