JP2008251356A - Fuel cell system, and its operation stop method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cell system capable of preventing intrusion of an oxidizer into an anode in stopping and storing a fuel cell, and of suppressing deterioration of a cathode; and its operation stop method. <P>SOLUTION: This fuel cell system is provided with: a fuel cell having an anode and a cathode; a tank connected to an exhaust port of the anode through a first opening/closing means and a pipe; a second opening/closing means having one end connected to the exhaust port of the anode, and exhausting an exhaust gas from the other end; and a fuel gas generation part generating a hydrogen-containing gas by being supplied with a raw fuel gas to supply it to the anode through a third opening/closing means, and to the tank through a fourth opening/closing means, respectively. This operation stop method includes a first step S1 of opening the fourth opening/closing means at a predetermined time before the stopping operation of the fuel cell is started, and storing the hydrogen-containing gas in the tank, and a second step S2, S3 of closing the third and fourth opening/closing means, and opening the first opening/closing means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fuel cell system and a method for stopping the operation thereof, and more specifically, a fuel cell system capable of preventing air from being mixed into the anode when the fuel cell system is stopped and suppressing cathode deterioration and a method for stopping the operation thereof. About.

  The fuel cell includes a cell having an anode (fuel electrode) and a cathode (oxygen electrode) interposing an electrolyte membrane, supplies a hydrogen-containing gas as a fuel gas to the anode side, and oxygen as an oxidant to the cathode side. It is a device that outputs electrical energy by supplying a contained gas. Each of the anode and the cathode includes a catalyst, and is formed in a porous shape so that fuel gas or an oxidant is brought into contact with the catalyst and transmitted to the electrolyte membrane.

  In general, in such a fuel cell, when the system is stopped, air enters the anode side from the cathode side, so that air exists on both the anode side and the cathode side. Then, the potential of the cathode on the back side of the anode where air exists increases, and the electrode material of the cathode deteriorates. This deterioration is accelerated as the cell temperature of the fuel cell increases.

  A similar problem occurs when hydrogen and oxygen are mixed on the anode side in the open circuit voltage (OCV) state of the fuel cell.

  In particular, the problem becomes more serious in a fuel cell that is used at home, for example, in which a repeated operation of starting, stopping, and storing is performed in a relatively short cycle.

With respect to this problem, in the conventional technique, when the fuel cell is stopped, the oxygen consumption process is performed in which the cell is generated with the supply of the oxygen-containing gas to the cathode electrode stopped to consume oxygen at the oxygen electrode. After that, a purge process was performed in which a purge gas was present at the cathode electrode, and the fuel cell was stored (see Patent Document 1). In addition, in order to further cope with the case where air enters into the cell due to the cell temperature decreasing after the fuel cell is stopped and the inside of the cell becomes negative pressure, or gas diffusing during storage, the fuel cell A technology has also been proposed in which the main body is housed in a sealed container maintained in a reducing atmosphere or an inert atmosphere, thereby preventing oxygen from entering the cells of the fuel cell and preventing electrode deterioration (patents). Reference 2).
JP 2002-93448 A JP 2006-85931 A

  However, the above-described Patent Document 1 has a problem that it is difficult to determine how long the power generation control after the supply of the oxygen-containing gas is stopped. In addition, deterioration of the cathode side electrode due to the backflow of the outside air containing oxygen during cooling of the fuel cell or the entry of outside air during storage of the fuel cell still remains as a problem.

  Furthermore, in the above-mentioned Patent Document 2, there is a problem that manufacturing the sealed container for sealing the fuel cell main body itself leads to high cost of the fuel cell system, in addition to the disadvantage that the sealed container is disadvantageous for cooling the fuel cell. is there.

  The present invention has been made in order to solve the above-described conventional problems, and has a simple configuration and can prevent oxygen intrusion to the anode side and suppress deterioration of the cathode side electrode. And to provide a method for stopping the operation.

  In order to solve the above problems, a fuel cell system (1) according to the present invention is connected to an exhaust port of the anode via a fuel cell having an anode and a cathode and a pipe in which a first opening / closing means is arranged. A tank having one end connected to the exhaust port of the anode and exhaust gas discharged from the other end, and a raw fuel gas is supplied to generate a hydrogen-containing gas, and the generated hydrogen-containing gas A fuel gas generation unit that supplies gas to the anode via third opening / closing means and to the tank via fourth opening / closing means, and for a predetermined time before the stop operation of the fuel cell is started Further, the fourth opening / closing means is opened, the hydrogen-containing gas is stored in the tank, and when the stop operation is started, the third and fourth opening / closing means are closed and the first opening / closing means is opened. Yes.

  The fuel cell system (2) according to the present invention includes a fuel cell having an anode and a cathode, a tank connected to the exhaust port of the anode via a pipe in which a first opening / closing means is disposed, and one end of the tank A second opening / closing means connected to the exhaust port of the anode, and exhaust gas is discharged from the other end; a raw fuel gas is supplied to generate a hydrogen-containing gas; and the generated hydrogen-containing gas is supplied to a third opening / closing means. And a fuel gas generation unit that supplies the anode to the anode, and the first opening / closing means opens before the fuel cell stop operation starts, and the exhaust gas is discharged from the exhaust port of the anode. When the tank is stored and the stop operation is started, the third opening / closing means is closed.

  The fuel cell system (3) according to the present invention is characterized in that, in the fuel cell system (1) or (2), the second opening / closing means is closed when the stop operation is started.

  The fuel cell system (4) according to the present invention further includes a temperature detection unit for detecting the temperature of the fuel cell in the fuel cell system (1) or (2), and is detected by the temperature detection unit. The second opening / closing means is closed when the measured temperature is below a predetermined value.

  Furthermore, the fuel cell system (5) according to the present invention is characterized in that, in any of the fuel cell systems (1) to (4), a catalyst is further provided in the vicinity of the exhaust port of the anode.

  The fuel cell system (6) according to the present invention is the fuel cell system (1) to (5) described above, wherein the tank includes pressure adjusting means for adjusting the pressure in the tank. Means is connected to the pipe for supplying the raw fuel gas via the fifth opening / closing means, and when the first opening / closing means is open, the fifth opening / closing means is opened and the raw fuel is supplied to the pressure regulating means. The pressure of the tank is increased by supplying the gas.

  Further, the fuel cell system shutdown method (1) according to the present invention includes a fuel cell having an anode and a cathode, a tank connected to the exhaust port of the anode via a first opening / closing means and a pipe, and one end thereof. A second opening / closing means connected to the exhaust port of the anode and exhausting exhaust gas from the other end; a raw fuel gas is supplied to generate a hydrogen-containing gas; and the generated hydrogen-containing gas is third-opened / closed. A fuel gas generation unit that supplies the anode to the anode via a means and supplies the tank to the tank via a fourth opening / closing means, a predetermined time before starting the stop operation of the fuel cell, When the first step of opening the fourth opening / closing means and storing the hydrogen-containing gas in the tank and the stop operation are started, the third and fourth opening / closing means are closed and the first opening / closing means is opened. A step, to include are characterized.

  A fuel cell system operation stop method (2) according to the present invention includes a fuel cell having an anode and a cathode, a tank connected to an exhaust port of the anode via a first opening / closing means and a pipe, and one end of the anode A second opening / closing means that is connected to the exhaust port and exhaust gas is discharged from the other end; a raw fuel gas is supplied to generate a hydrogen-containing gas; and the generated hydrogen-containing gas is passed through the third opening / closing means. In the fuel cell system comprising a fuel gas generation unit that supplies the anode to the anode, the first opening / closing means is opened and the exhaust gas from the exhaust port of the anode is opened before a predetermined time for starting the stop operation of the fuel cell. Is stored in the tank, and a second step of closing the third opening / closing means when the stop operation is started.

  According to the present invention, in the fuel cell system, when the operation is stopped, the hydrogen-containing gas previously stored in another tank is caused to flow to the anode in the fuel cell so that the pressure in the cell stack of the fuel cell is removed as much as possible. By making the pressure higher than the atmospheric pressure, mixing of outside air containing oxygen in the stopped state can be prevented, and deterioration of the fuel cell, particularly deterioration on the cathode side can be suppressed.

  In addition, even if the outside air flows backward, oxygen is burned by the catalyst provided at the outlet on the anode side and the exhaust pipe in the vicinity thereof, and the cathode side electrode can be prevented from deteriorating.

  Furthermore, when the fuel cell is stored, the gas stored in the tank is used to maintain the atmospheric pressure in the cell stack of the fuel cell at a predetermined level, thereby more easily preventing the entry of outside air during storage. There is an effect that can be.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram showing a schematic configuration of a fuel cell system according to a first embodiment of the present invention.

  As shown in FIG. 1, the fuel cell system according to the first embodiment shows a fuel cell 1, a fuel gas generation unit 2, an oxygen supply unit 3, a tank 4, a temperature detection unit 5, and these units. Are provided with opening / closing means V1 to V7 arranged in pipes connected to each other, a control part 6 for controlling these parts (including opening / closing means), and a catalyst 7. FIG. 1 shows a configuration necessary for explaining the first embodiment of the present invention, and other components are omitted, but the fuel cell system realizes a function of supplying power. It has the usual components needed above.

  The fuel cell 1 includes a cell stack in which a plurality of cells having an anode (hydrogen electrode) and a cathode (oxygen electrode) interposing an electrolyte membrane are connected in series, and a hydrogen-containing gas is supplied to the anode. This is an apparatus for generating electricity by supplying an oxygen-containing gas to a cathode and causing an electrochemical reaction between the hydrogen-containing gas and the oxygen-containing gas. In FIG. 1, only one unit cell is shown in the cell stack of the fuel cell 1 for the sake of brevity and ease of explanation, but the present invention is not limited thereto.

  The fuel gas generator 2 is means for supplying a hydrogen-containing gas that is a fuel gas to the fuel cell 1. For example, it is embodied as a reformer and reforms a raw fuel gas (for example, CH4) such as city gas (13A) to generate a hydrogen-containing gas as a fuel. The generated hydrogen-containing gas is supplied to the anode in the cell stack through the piping and the opening / closing means V3, and is supplied to the tank 4 through the piping and the opening / closing means V4. Is done. The supply amount and supply timing of the hydrogen-containing gas to the anode and the tank 4 are controlled by opening / closing the opening / closing means V3 or the opening / closing means V4 according to a control signal from the control unit 6 according to the power generation status of the fuel cell 1. .

  The oxygen supply unit 3 is means for supplying oxygen or an oxygen-containing gas to the cathode of the cell stack in the fuel cell 1 through piping and opening / closing means V6. For example, it is embodied as an air fan or an air blower, ON / OFF is controlled by a control signal from the control unit 6, and air is supplied to the cathode of the cell stack as an oxygen-containing gas. Further, the gas containing oxygen remaining in the fuel cell 1 after the reaction is discharged through a predetermined exhaust path (not shown).

  The tank 4 is a container that contains a gas containing hydrogen, and is configured to store the hydrogen-containing gas supplied from the fuel gas generator 2 in the present embodiment. When the operation of the fuel cell 1 is stopped, the stored hydrogen-containing gas automatically flows to the anode side of the fuel cell 1 through the piping and the opening / closing means V1 as the pressure in the cell stack is reduced by cooling the fuel cell. Go.

  The tank 4 may be a simple container for containing gas, but in the present embodiment, the tank 4 further includes components such as opening / closing means and a piston so that the tank 4 can be pressurized by the raw fuel gas. Suppose that That is, in the pressurized state, the opening / closing means V5 is opened and the opening / closing means V7 is closed to increase the pressure in the tank 4. Otherwise, the opening / closing means V5 is closed and the opening / closing means V7 is opened, for example, the gas stored in the tank 4 can be in equilibrium with the outside air.

  The capacity of the tank 4 is determined by the output capacity of the fuel cell. For example, in the case of a fuel cell with a household output of about 1 kW, it is in the range of about several tens to several hundred mL.

  The temperature detector 5 is a means for detecting the temperature of the cell stack of the fuel cell 1 and may be, for example, a thermocouple or a resistance temperature detector disposed at the exhaust port of the anode of the cell stack.

  V <b> 1 to V <b> 7 are opening / closing means for controlling the passage of gas, such as an electromagnetic valve, and opening / closing is controlled by a control signal from the control unit 6.

  The control unit 6 is connected to each of the above-described units and includes an interface unit (not shown) with each unit, and the amount of the hydrogen-containing gas supplied to the fuel cell 1 or the oxygen-containing gas when the fuel cell is operated. It is configured to control the amount, temperature, etc., and to control the stopping operation when stopping and the storage state of the fuel cell 1 in the stopped state.

  The catalyst 7 is a platinum-based metal catalyst applied to the outside of the exhaust port of the anode of the cell stack and a part of the pipe 11 connected to the exhaust port. When the outside air containing oxygen flows backward from the exhaust pipe 11 through the valve V2, it burns at the outlet of the anode to prevent backflow of oxygen to the anode.

  With the above configuration, the fuel cell system stores the hydrogen-containing gas, which is the fuel gas, in the tank 4 in advance before the operation is stopped, and the stored hydrogen-containing gas is supplied to the anode of the fuel cell 1 as the stop operation starts. By flowing toward the anode, mixing and intrusion of the oxidant into the anode is prevented, and thus deterioration of the cathode electrode material is suppressed. Hereinafter, a method for stopping the operation of the fuel cell system according to the present embodiment will be specifically described.

  FIG. 2 is a flowchart for explaining a method of stopping the operation of the fuel cell system according to the first embodiment shown in FIG. In the following description, V1 to V7 are described as valves.

  During the normal operation of the fuel cell system, in step S0, the valves V1, V4 and V5 are closed and the valves V2, V3 and V6 are opened by the control of the control unit 6. The fuel gas generation unit 2 is supplied with city gas 13A as raw fuel to generate a hydrogen-containing gas and outputs it to the anode of the cell stack in the fuel cell 1, and the oxygen supply unit 3 supplies air to the fuel cell 1 The fuel cell 1 is supplied with electric power. In step S1, the valve V4 is opened for a predetermined time before the fuel cell system stops, and the tank 4 is filled with the hydrogen-containing gas output from the fuel gas generator 2.

  In step S2, the fuel gas generation unit 2 and the oxygen supply unit 3 are controlled to stop the supply of the hydrogen-containing gas and air, the valves V3, V4, and V6 are controlled and closed, and the operation of the fuel cell is stopped. At the same time, the valve V1 is controlled and opened, and the hydrogen-containing gas stored in the tank 4 automatically flows to the anode through the piping due to the decompression in the cell stack accompanying the cooling of the fuel cell 1. At this time, since the fuel cell 1 is being cooled, the valve V2 is controlled to be kept open.

  In step S3, the fuel cell 1 is placed in a cooling state. That is, the valves V3, V4, V6 are closed, the valves V1, V2 are open, and the pressure in the cell stack decreases as the temperature of the fuel cell 1 decreases. A hydrogen-containing gas flows into the cell stack.

  In step S <b> 4, the temperature detection unit 5 detects the temperature of the fuel cell 1.

  In step S5, the control unit 6 determines whether or not the temperature of the fuel cell 1 detected by the temperature detection unit 5 in step S4 has decreased to a predetermined temperature, for example, the temperature of the outside air. When it falls to the predetermined temperature, the process proceeds to step S6. If the temperature has not decreased to the predetermined temperature, the process returns to step S3 and the fuel cell 1 is continuously cooled.

  In step S6, the valve V2 is closed and the fuel cell 1 is maintained in the storage state. That is, in this storage mode, the valves V2, V3, V4, and V6 arranged in the pipe connected to the fuel cell 1 are closed to keep the fuel cell 1 in the storage state.

  Further, if necessary, in order to prevent the outside air containing oxygen from entering from outside in the storage state, the valve V5 that stops the raw fuel gas is opened, the valve V7 is closed, and the tank 4 is pressurized. The pressure in the battery 1 may be maintained constant, i.e., slightly higher than the external pressure. Thereby, mixing of outside air can be avoided more reliably.

  As described above, according to the fuel cell system and the operation stopping method thereof according to the first embodiment, the tank connected to the outlet of the anode of the fuel cell is provided, and the tank is connected to the tank before the operation of the fuel cell is stopped. The hydrogen-containing gas, which is a combustion gas, is filled, and simultaneously with the stop operation, the gas stored in the tank automatically flows out to the anode due to the pressure difference. It is possible to prevent outside air from entering the anode due to a decrease in pressure in the stack. At the same time, the pressure in the cell stack of the fuel cell can be maintained at a constant level even in the storage state, so that the entry of outside air can be prevented more reliably. Thereby, it becomes possible to reduce deterioration of the electrode material on the cathode side.

  Further, when the pressure in the fuel cell stack is not so different from the outside air pressure, even if outside air enters a little through, for example, the valve V2, the catalyst 7 is provided at the outlet of the anode, etc. Since it burns, it does not cause deterioration of the electrode material on the cathode side.

(Second Embodiment)
FIG. 3 is a block diagram showing a schematic configuration of a fuel cell system according to the second embodiment of the present invention. The fuel cell system has a configuration similar to that of the fuel cell system according to the first embodiment shown in FIG. 1. In FIG. 3, components having the same functions as those in FIG. ing. That is, the fuel cell system shown in FIG. 3 is configured to store the exhaust gas on the anode side of the cell stack of the fuel cell 1 that normally contains hydrogen in the tank 4 and the catalyst 7 is omitted. 1 in that it differs from the fuel cell system shown in FIG.

  With the above configuration, in the fuel cell system, the tank 4 stores the exhaust gas on the anode side of the cell stack of the fuel cell in advance before the operation is stopped, and the stored exhaust gas containing hydrogen is again fueled when the stop operation is started. By flowing toward the anode of the battery 1, the oxidant is prevented from entering and entering the anode, thereby suppressing deterioration of the cathode electrode material. Hereinafter, the operation stop method will be specifically described.

  FIG. 4 is a flowchart for explaining a stop operation of the fuel cell system shown in FIG. In the following, processing similar to the processing described with reference to FIG. 2 will be described briefly.

  In step S10, as in step S0 of FIG. 2, when the fuel cell system is normally operated, the valves V1 and V5 are closed and the valves V2, V3, and V6 are opened by the control of the control unit 6. Is done. The fuel gas generation unit 2 is supplied with city gas 13A as raw fuel to generate a hydrogen-containing gas and outputs it to the anode of the cell stack in the fuel cell 1, and the oxygen supply unit 3 supplies air to the fuel cell 1 The fuel cell 1 supplies power to the cathode of the cell stack.

  In step S <b> 11, the valve V <b> 1 is opened and the tank 4 is filled with the exhaust gas on the anode side of the cell stack of the fuel cell 1 before the predetermined time when the fuel cell system stops.

  In step S12, the fuel gas generation unit 2 and the oxygen supply unit 3 are controlled to stop the supply of the hydrogen-containing gas and air, the valves V3 and V6 are controlled and closed, and the operation of the fuel cell is stopped. As the fuel cell 1 is cooled, the pressure reduction in the cell stack starts gradually, and the valve V1 remains open, so that the exhaust gas stored in the tank 4 automatically flows to the anode side through the piping. At this time, since the fuel cell 1 is being cooled, the valve V2 is controlled to be continuously opened.

  In step S13, the fuel cell 1 is placed in a cooled state. That is, the valves V3 and V6 are closed, the valves V1 and V2 are opened, and as the temperature of the fuel cell 1 decreases, the pressure in the cell stack decreases. The contained exhaust gas flows into the cell stack.

  In step S <b> 14, the temperature detection unit 5 detects the temperature of the fuel cell 1.

  In step S15, the control unit 6 determines whether or not the temperature of the fuel cell 1 detected by the temperature detection unit 5 in step S14 has decreased to a predetermined temperature, for example, the temperature of the outside air. When it falls to the predetermined temperature, the process proceeds to step S16. If the temperature has not fallen to the predetermined temperature, the process returns to step S13 to continue cooling the fuel cell 1.

  In step S16, the valve V2 is closed and the fuel cell 1 is maintained in the storage state. That is, in this storage mode, the valves V2, V3, V6 arranged in the pipe connected to the fuel cell 1 are closed, and the fuel cell 1 is maintained in the storage state.

  Further, if necessary, in order to prevent the outside air containing oxygen from entering from outside in the storage state, the valve V5 that stops the raw fuel gas is opened, the valve V7 is closed, and the tank 4 is pressurized. The pressure in the battery 1 may be kept constant. Thereby, mixing of outside air can be avoided more reliably.

  As described above, according to the fuel cell system and the operation stopping method thereof according to the second embodiment, the tank connected to the outlet of the anode of the cell stack of the fuel cell is provided, and before the operation of the fuel cell is stopped. After filling the tank with the exhaust gas of the fuel cell containing hydrogen and stopping the operation, the exhaust gas stored in the tank automatically flows out to the anode due to the pressure difference. It is possible to prevent outside air from entering the anode due to a decrease in pressure accompanying a decrease in temperature. At the same time, since the pressure in the cell stack of the fuel cell can be maintained at a constant level even in the storage state, the intrusion of outside air can be prevented more reliably. Thereby, it becomes possible to reduce deterioration of the electrode material on the cathode side.

  Of course, in the second embodiment, as in the first embodiment, the catalyst 7 is provided on the anode outlet side, and the pressure in the cell stack is not so different from the external pressure. In this case, even if outside air enters a little through, for example, the valve V2, the catalyst 7 burns oxygen, so that the cathode-side electrode material is not deteriorated.

  Further, in the first and second embodiments described above, the gas supply from the tank to the anode was automatically performed by the depressurization of the cell stack accompanying the cooling of the fuel cell. And the tank may be brought into equilibrium pressure with the supply line of the city gas for raw fuel.

  Further, at the start of power generation of the fuel cell, the gas in the tank may be purged with raw fuel gas such as city gas.

  In the above, the present invention has been described by way of specific embodiments. However, the present invention is in no way limited thereto, and the fuel cell system and the method for stopping the operation according to the present invention are within the scope of the present invention. Various modifications can be made without departing from the scope.

  For example, in the first embodiment, the valve V <b> 3 may be disposed in a pipe between the point where the pipe from the fuel gas generation unit 2 branches and the fuel gas generation unit 2.

  In the first and second embodiments, the temperature detection unit is used to detect the temperature of the fuel cell and the valve V2 is closed after the fuel cell 1 is sufficiently cooled. The valve V2 may be closed without waiting. For example, when the operation is stopped, the valve V2 may be controlled to close simultaneously with the valve V3 and the valve V6 in step S2 or S12. That is, it is not necessary to distinguish between the cooling mode and the storage mode. In this case, the temperature detection unit can be omitted.

1 is a block diagram showing a schematic configuration of a fuel cell system according to a first embodiment of the present invention. It is a flowchart explaining the operation stop method of the fuel cell system which concerns on the 1st Embodiment of this invention. It is a block diagram which shows schematic structure of the fuel cell system which concerns on the 2nd Embodiment of this invention. It is a flowchart explaining the operation stop method of the fuel cell system which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel cell 2 Fuel gas production | generation part 3 Oxygen supply part 4 Tank 5 Temperature detection part 6 Control part 7 Catalyst 11 (Exhaust) piping V1-V7 Opening / closing means (valve)

Claims (8)

A fuel cell having an anode and a cathode;
A tank connected to the exhaust port of the anode via a pipe in which the first opening / closing means is disposed;
A second opening / closing means having one end connected to the exhaust port of the anode and exhaust gas discharged from the other end;
A fuel gas supplied with raw fuel gas to generate a hydrogen-containing gas, and the generated hydrogen-containing gas is supplied to the anode via a third opening / closing means and supplied to the tank via a fourth opening / closing means A generator,
The fourth opening / closing means opens, stores the hydrogen-containing gas in the tank, and starts the stopping operation before a predetermined time for starting the stopping operation of the fuel cell. When the stopping operation starts, the third and fourth opening / closing means The fuel cell system is closed and the first opening / closing means is opened. A fuel cell having an anode and a cathode;
A tank connected to the exhaust port of the anode via a pipe in which the first opening / closing means is disposed;
A second opening / closing means having one end connected to the exhaust port of the anode and exhaust gas discharged from the other end;
A fuel gas generation unit that is supplied with raw fuel gas to generate a hydrogen-containing gas, and supplies the generated hydrogen-containing gas to the anode via a third opening and closing means;
The first opening / closing means opens and stores the exhaust gas from the exhaust port of the anode in the tank before a predetermined time for starting the stop operation of the fuel cell. A fuel cell system characterized in that the means is closed.   3. The fuel cell system according to claim 1, wherein when the stop operation is started, the second opening / closing means is closed. A temperature detector for detecting the temperature of the fuel cell;
3. The fuel cell system according to claim 1, wherein the second opening / closing means is closed when a temperature detected by the temperature detection unit is equal to or lower than a predetermined value.   The fuel cell system according to any one of claims 1 to 4, further comprising a catalyst in the vicinity of the exhaust port of the anode. The tank includes pressure adjusting means for adjusting the pressure in the tank,
The pressure adjusting means is connected to a pipe for supplying the raw fuel gas via a fifth opening / closing means;
2. The tank according to claim 1, wherein when the first opening / closing means is open, the fifth opening / closing means is opened and the raw fuel gas is supplied to the pressure adjusting means, thereby boosting the tank. The fuel cell system according to claim 5. A fuel cell having an anode and a cathode, a tank connected to the exhaust port of the anode via a first opening / closing means and a pipe, one end connected to the exhaust port of the anode, and exhaust gas discharged from the other end A second opening / closing means, and a raw fuel gas is supplied to generate a hydrogen-containing gas, the generated hydrogen-containing gas is supplied to the anode via a third opening / closing means, and the hydrogen-containing gas is supplied via a fourth opening / closing means. In a fuel cell system comprising a fuel gas generation unit to be supplied to a tank,
A first step of opening the fourth opening / closing means and storing the hydrogen-containing gas in the tank, a predetermined time before starting the stopping operation of the fuel cell;
And a second step of closing the third and fourth opening / closing means and opening the first opening / closing means when the stop operation is started, and a method of stopping the operation of the fuel cell system. A fuel cell having an anode and a cathode, a tank connected to the exhaust port of the anode via a first opening / closing means and a pipe, one end connected to the exhaust port of the anode, and exhaust gas discharged from the other end A fuel cell system comprising: a second opening / closing means; and a fuel gas generating section for supplying a raw fuel gas to generate a hydrogen-containing gas and supplying the generated hydrogen-containing gas to the anode via a third opening / closing means. In
A first step of opening the first opening / closing means and storing the exhaust gas from the exhaust port of the anode in the tank, a predetermined time before starting the operation of stopping the fuel cell;
And a second step of closing the third opening / closing means when the stop operation is started.

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