JP5299970B2 - Fuel cell system - Google Patents

Description

  The present invention relates to a fuel cell system.

  As a conventional fuel cell system, a reformer that generates reformed gas containing hydrogen by reforming raw fuel such as kerosene and liquefied petroleum gas, hydrogen in the reformed gas, and oxygen in the air And a fuel cell that generates electricity by causing them to undergo an electrochemical reaction (see, for example, Patent Document 1). This fuel cell system includes a desulfurizer that desulfurizes the raw fuel upstream of the reformer.

JP 2002-293504 A

  In recent years, the fuel cell system as described above has been spreading to general households, and therefore further improvement in reliability is desired. In conventional fuel cell systems, the raw fuel remaining in the piping and desulfurizer is adsorbed by the catalyst of the desulfurizer while the system is stopped, so that the internal pressure of the desulfurizer becomes negative when the system is restarted. There was a case. When the raw fuel is supplied with the desulfurizer in a negative pressure state, the raw fuel suddenly flows into the desulfurizer, which may affect the equipment on the raw fuel supply source side. As a result, the reliability of the fuel cell system may be affected.

  Therefore, an object of the present invention is to provide a fuel cell system capable of improving reliability.

  In order to solve the above problems, a fuel cell system according to the present invention includes a desulfurizer that performs desulfurization of raw fuel, a first valve disposed upstream of the desulfurizer, and a first valve and a desulfurizer. A second valve that is disposed, a storage section that is disposed between the first valve and the second valve, stores raw fuel, and a control unit that controls opening and closing of each of the first valve and the second valve; The control means stores the raw fuel in the storage portion by opening the first valve when the second valve is closed when the system is started, and the raw fuel in the storage portion. After the fuel is stored, the first valve is closed and the second valve is opened to supply the raw fuel to the desulfurizer.

  In the fuel cell system according to the present invention, the first valve, the reservoir, and the second valve are arranged in order from the upstream side on the upstream side of the desulfurizer. Further, the control means capable of controlling the first valve and the second valve is provided in the storage unit by opening the first valve when the second valve is in a closed state when the system is activated. Store raw fuel. At this time, since the second valve is closed, the raw fuel is temporarily stored in the storage portion while preventing a large amount of raw fuel from flowing into the desulfurizer from the raw fuel supply source at a time. Can do. Next, after the raw fuel is stored in the reservoir, the first valve is closed and the second valve is opened, so that a large amount of raw fuel flows from the raw fuel supply source into the desulfurizer at once. It is possible to supply the raw fuel in the reservoir to the desulfurizer while preventing the above. Thus, the pressure in a desulfurizer can be raised by supplying raw fuel to a desulfurizer. Furthermore, the control means can gradually increase the pressure in the desulfurizer by repeatedly opening and closing the first valve and the second valve, and finally can eliminate the negative pressure in the desulfurizer. Further, the negative pressure in the desulfurizer can be eliminated by only two valves arranged on the downstream side of the desulfurizer without providing a special device. As described above, it is possible to prevent the raw fuel from suddenly flowing into the desulfurizer from the supply source at the time of starting the system at a low cost, thereby improving the reliability of the fuel cell system.

  The fuel cell system according to the present invention further includes a third valve disposed downstream of the desulfurizer and controlled to be opened and closed by the control means. The control means closes the third valve when the system is stopped. It is preferable to open the third valve after the negative pressure in the desulfurizer is eliminated at the time of starting the system. As a result, it is possible to prevent the remaining gas from being adsorbed on the downstream piping of the desulfurizer while the system is stopped, and the range where the negative pressure is generated when the system is started is reduced in the desulfurizer and in the desulfurizer. It can be limited to the upstream side only.

  According to the present invention, it is possible to improve the reliability of the fuel cell system.

1 is a schematic configuration diagram of an embodiment of a fuel cell system according to the present invention. It is the structure schematic in the characteristic part of the fuel cell system of this embodiment. It is a flowchart which shows operation | movement of the fuel cell system which concerns on this embodiment. It is a figure which shows the result of the Example of the fuel cell system of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same or an equivalent part, and the overlapping description is abbreviate | omitted.

  FIG. 1 is a schematic configuration diagram of an embodiment of a fuel cell system according to the present invention. As shown in FIG. 1, a fuel cell system 1 includes a reformer 2 that generates reformed gas by reforming raw fuel, and a polymer electrolyte fuel cell that generates power using the reformed gas. 3 is provided. The fuel cell system 1 is used as a household power supply source, and liquefied petroleum gas (LPG) is used as a raw fuel.

  A desulfurizer 4 is disposed between the raw fuel supply source and the reformer 2. The desulfurizer 4 desulfurizes the raw fuel introduced from the outside with a desulfurization catalyst. On the upstream side of the desulfurizer 4, a first electromagnetic valve (first valve) 21 that controls the supply of raw fuel to the fuel cell system 1, a tank (reservoir) 22 for storing raw fuel, and a second electromagnetic A valve (second valve) 23 is provided in order. On the other hand, a third electromagnetic valve (third valve) 24 is provided on the downstream side of the desulfurizer 4. When the fuel cell system 1 is stopped, the third electromagnetic valve 24 is closed and the first electromagnetic valve 21 and the second electromagnetic valve 23 are closed. The internal pressure of the desulfurizer 4 is reduced by the desulfurization catalyst. To do. For this reason, when the fuel cell system 1 is started, by controlling the opening and closing of the solenoid valves 21 and 23, a sudden flow of raw fuel into the fuel cell system 1 is prevented (details will be described later). . A fuel pump 25 is provided on the downstream side of the desulfurizer 4 and the electromagnetic valve 24. The fuel pump 25 supplies raw fuel to the reformer 2.

  The reformer 2 reforms the raw fuel with the reforming catalyst to generate a reformed gas containing hydrogen. The reformer 2 has a vaporizer (not shown) that vaporizes water supplied by the water pump 27, and generates reformed gas using steam and gaseous raw fuel.

  Since the steam reforming reaction is an endothermic reaction, the reformer 2 is provided with a burner 10 for heating the reforming catalyst. The burner 10 is connected to a supply path for raw fuel introduced by the fuel pump 25 described above. The downstream side of the fuel pump 25 described above is branched into a fuel supply path to the reformer 2 and a fuel supply path to the burner 10, and the fuel supply path is selected by opening / closing operation of the electromagnetic valve 26. Controlled. In addition, air that has been pumped by the air pump 28 is introduced into the burner 10. The exhaust gas generated by the combustion of the burner 10 is recovered through the heat exchanger 31 and exhausted to the outside.

  The reformed gas generated by the reformer 2 is introduced into a CO remover 6 disposed on the downstream side of the reformer 2. The CO remover 6 selectively oxidizes carbon monoxide contained in the reformed gas and converts it into carbon dioxide in order to reduce the carbon monoxide concentration in the reformed gas. The CO remover 6 selectively oxidizes using the air fed by the air pump 29.

  The reformed gas processed by the CO remover 6 is introduced into a humidifier 7 disposed on the upstream side of the fuel cell 3. The humidifier 7 stores water therein, and humidifies the reformed gas by allowing the introduced reformed gas to pass through as bubbles. The humidified reformed gas is supplied to the anode of the fuel cell 3.

  Further, the air pumped by the air pump 8 is introduced into the humidifier 9 disposed on the upstream side of the fuel cell 3. The humidifier 9 stores water therein and humidifies the air by passing the introduced air as bubbles. The humidified air is supplied to the cathode of the fuel cell 3.

  The fuel cell 3 is configured as a stack structure in which a plurality of battery cells are stacked. Each battery cell has an anode, a cathode, and a polymer membrane disposed therebetween. As described above, the reformed gas and air supplied to the fuel cell 3 are humidified because the polymer membrane is humidified in order to maintain high conductivity of the polymer membrane that is the electrolyte of the fuel cell 3. It is necessary to do this. In each battery cell of the fuel cell 3, hydrogen in the reformed gas supplied to the anode and oxygen in the air supplied to the cathode cause an electrochemical reaction to generate DC power.

  The electric power generated in the fuel cell 3 is supplied to the home via a converter and an inverter (not shown). The converter transforms the voltage of DC power. The inverter converts the transformed power from direct current to alternating current.

  By the way, surplus of the water vaporized in the reformed gas and supplied to the anode of the fuel cell 3 circulates and returns to the water recovery tank 13. On the other hand, the surplus (cathode drain) of the water vaporized in the air and supplied to the cathode of the fuel cell 3 is stored in the water recovery tank 13. The water stored in the humidifier 9 is supplied to the fuel cell 3 by the water pump 34 as cooling water. The cooling water is heated by the heat generated by the fuel cell 3 and returned to the humidifier 9.

  The water stored in the humidifiers 7 and 9 is introduced into the water treatment system 30 including the water recovery tank 13, the water pump 41, and the ion exchanger 14 every predetermined time. The water introduced from the humidifiers 7 and 9 into the water treatment system 30 is circulated and supplied to the ion exchanger 14 by the water pump 41 and then returned to the humidifiers 7 and 9. The water pump 27 that supplies water to the reformer 2 is connected to the water treatment system 30, and the drain contained in the exhaust gas of the burner 10 is accommodated in the water recovery tank 13.

  In addition, the surplus (so-called off-gas) of the reformed gas supplied to the anode of the fuel cell 3 is recovered through the heat exchanger 33, and then the reformer 2 is used to heat the reforming catalyst. It is used as fuel for the burner 10 provided in When the fuel cell system 1 is started, the raw fuel desulfurized by the desulfurizer 4 by switching the electromagnetic valve 26 is used as the fuel for the burner 10. On the other hand, the surplus of the air supplied to the cathode of the fuel cell 3 is recovered through the heat exchanger 32 and exhausted to the outside.

  Further, the fuel cell system 1 is connected to a hot water storage unit A in which household water is stored. The water stored in the hot water storage unit A is introduced into the heat recovery system from the inlet 15, circulated through the heat recovery system by the water pump 35, and then returned to the hot water storage unit A from the outlet 16. This heat recovery system is provided with heat exchangers 32 and 33 for recovering exhaust heat of the fuel cell 3, a heat exchanger 31 for recovering heat from the exhaust gas of the burner 10, and a cooling circuit for cooling the fuel cell 3 body. A heat exchanger (not shown) and the like are included. Hot water is transferred through the heat recovery system.

  The operation of the components of the fuel cell system 1 described above is controlled by electrical devices (not shown). The electrical equipment controls the constituent equipment according to the sensors provided in the fuel cell system 1 and the usage status of the user. Examples of the sensors include a thermometer 36 that detects the ambient temperature, a pressure gauge 37 that is disposed between the solenoid valves 21 and 23, a flow meter 38 that is provided downstream of the fuel pump 25, and a downstream of the air pump 29. A flow meter 39 provided on the side, a flow meter 51 provided on the downstream side of the air pump 28, and the like are used.

  The outline of the basic operation of the fuel cell system 1 will be described. The fuel cell system 1 performs a negative pressure elimination process of the desulfurizer 4 after the system is started. Thereafter, raw fuel and air are supplied to the burner 10 by the fuel pump 25 and the air pump 28. In addition, water is circulated by the water pump 41 in the water treatment system 30, and the cooling water of the fuel cell 3 is circulated by the water pump 34.

  On the other hand, when the temperature of the reformer 2 is stabilized by the combustion of the burner 10, the supply path of the raw fuel is changed by the electromagnetic valve 26 and the raw fuel is supplied to the reformer 2. Further, water of the water treatment system 30 is supplied to the reformer 2 by the water pump 27. The reformer 2 generates a reformed gas using raw fuel and water, and supplies the generated reformed gas to the CO remover 6. In addition, air is supplied to the CO remover 6 by the air pump 29. Then, the reformed gas from which CO has been removed by the CO remover 6 is supplied to the humidifier 7, humidified and supplied to the anode. Then, the anode off gas is supplied to the burner 10. In addition, air is supplied to the humidifier 9 by the air pump 8, humidified and supplied to the cathode. As a result, power is generated in the fuel cell 3 and electric power is supplied to the home. The electrical equipment controls the amount of raw fuel and water supplied to the reformer 2, the amount of air supplied to the CO remover 6, the pump output, etc., based on the power used by the user and the output of the sensors. To perform stable operation and optimum operation.

  Next, the structure in the characteristic part of embodiment of this invention is demonstrated in detail with reference to FIG. FIG. 2 is a schematic configuration diagram of a characteristic portion of the fuel cell system according to the present embodiment. FIG. 2 shows the connection relationship between a control unit (control means) 100 that controls the entire fuel cell system 1, the first electromagnetic valve 21, the second electromagnetic valve 23, the third electromagnetic valve 24, and the pressure gauge 37. It is shown with a dashed-dotted line. Although not shown in FIG. 2, other devices of the fuel cell system 1 are also connected to the control unit 100.

  As shown in FIG. 2, the control unit 100 is electrically connected to the first solenoid valve 21, the second solenoid valve 23, and the third solenoid valve 24, and a signal for opening and closing each valve at a predetermined timing. It has a function to output. Specifically, when the fuel cell system 1 is started, the control unit 100 opens the first electromagnetic valve 21 when the second electromagnetic valve 23 is in the closed state, thereby supplying the raw fuel to the tank 22. And after the raw fuel is stored in the tank 22, the first electromagnetic valve 21 is closed and the second electromagnetic valve 23 is opened to supply the raw fuel to the desulfurizer 4. Yes. Furthermore, the control part 100 can repeat the opening / closing control of the 1st electromagnetic valve 21 and the 2nd electromagnetic valve 23, when the negative pressure of the desulfurizer 4 is not eliminated. The size of the tank 22 is not particularly limited, and it is sufficient that at least the volume of the tank 22 is smaller than the volume of the desulfurizer 4. Since the amount of raw fuel that can be supplied to the desulfurizer 4 by one opening / closing control decreases as the volume of the tank 22 becomes smaller, it is necessary to increase the number of times of opening / closing control. Since the amount of raw fuel flowing in from a short time is small, the influence on the system on the supply source side can be reduced.

  Further, the control unit 100 closes the third electromagnetic valve 24 when the fuel cell system 1 is stopped, and sets the third electromagnetic valve 24 after the negative pressure in the desulfurizer 4 is eliminated when the fuel cell system 1 is started. It has a function to make it open. Further, the control unit 100 has a function of closing the first electromagnetic valve 21 or the second electromagnetic valve 23 when the fuel cell system 1 is stopped.

  The control unit 100 is electrically connected to the pressure gauge 37 and has a function of acquiring the pressure in the pipe detected by the pressure gauge 37. Specifically, when the first solenoid valve 21 and the third solenoid valve 24 are in the closed state and the second solenoid valve 23 is in the open state, the gap between the first solenoid valve 21 and the third solenoid valve 24 is set. And the pressure in the desulfurizer 4 can be acquired. When the second electromagnetic valve 23 is closed and the first electromagnetic valve 21 is open, the pressure in the pipe between the raw fuel supply source and the second electromagnetic valve 23 is acquired. Can do. Based on the pressure acquired by the pressure gauge 37, the control unit 100 can determine whether or not raw fuel has been stored in the tank 22 when the first electromagnetic valve 21 is opened. Further, the control unit 100 can determine whether or not the negative pressure of the desulfurizer 4 has been eliminated based on the pressure acquired by the pressure gauge 37.

  Next, the operation of the fuel cell system 1 according to the present embodiment will be described with reference to FIG. FIG. 3 is a flowchart showing the operation of the fuel cell system 1 according to the present embodiment. The process of FIG. 3 is executed in the control unit 100 and executed when the fuel cell system 1 is activated. In the previous operation, when the fuel cell system 1 is stopped, the control unit 100 closes the first electromagnetic valve 21, the second electromagnetic valve 23, and the third electromagnetic valve 24. Therefore, the process of FIG. 3 is started when the first electromagnetic valve 21 is closed, the second electromagnetic valve 23 is closed, and the third electromagnetic valve 24 is closed.

  As shown in FIG. 3, the control unit 100 maintains the closed state of the third electromagnetic valve 24 as the fuel cell system 1 is activated (step S <b> 10). Next, the control unit 100 maintains the closed state of the second electromagnetic valve 23 (step S12). As a result, the internal pressure in the piping between the first electromagnetic valve 21 and the second electromagnetic valve 23 and the internal pressure in the tank 22 is separated from the internal pressure in the desulfurizer 4 between the second electromagnetic valve 23 and the third electromagnetic valve 24. Is done. Therefore, the pressure gauge 37 can detect only the change in the internal pressure in the pipe 22 and the tank 22 between the first electromagnetic valve 21 and the second electromagnetic valve 23 regardless of the internal pressure of the desulfurizer 4. .

  After the process of S12, the control unit 100 waits for one second (step S14), and opens the first electromagnetic valve 21 (step S16). As a result, the raw fuel is supplied from the supply source into the piping between the first electromagnetic valve 21 and the second electromagnetic valve 23 and the tank 22, and the internal pressure in the pipe rises.

  After the process of S <b> 16, the control unit 100 determines the pressure between the pipe between the first electromagnetic valve 21 and the second electromagnetic valve 23 and the pressure in the tank 22 based on the pressure value detected by the pressure gauge 37 ( Step S18). Specifically, the control unit 100 determines whether or not the pressure value P of the pressure gauge 37 is greater than a preset threshold value 1 kPa. When the control unit 100 determines that the pressure value P is equal to or less than the threshold value 1 kPa, the control unit 100 determines that sufficient raw fuel is not stored in the tank 22, continues to maintain the open state of the first electromagnetic valve 21, and again The process of S18 is performed.

  On the other hand, when determining that the pressure value P is larger than the threshold value 1 kPa in the process of S18, the control unit 100 determines that sufficient raw fuel is stored in the tank 22, and closes the first electromagnetic valve 21 (step S1). S20). Thereafter, the control unit 100 waits for one second (step S22), and opens the second electromagnetic valve 23 (step S24). As a result, the raw fuel stored in the tank 22 is supplied to the desulfurizer 4. The pressure gauge 37 can detect the internal pressure in the pipe, the tank 22 and the desulfurizer 4 between the first electromagnetic valve 21 and the third electromagnetic valve 24 when the second electromagnetic valve 23 is in the open state. The internal pressure in the piping between the first electromagnetic valve 21 and the third electromagnetic valve 24, the tank 22 and the desulfurizer 4 is the internal pressure around the desulfurizer 4 at the start of the process of FIG. Higher than. Therefore, the control unit 100 determines whether or not the negative pressure of the desulfurizer 4 has been eliminated based on the pressure value of the pressure gauge 37 (step S26). Specifically, the control unit 100 determines whether or not the pressure value P detected by the pressure gauge 37 is greater than 0 kPa. If it determines with the pressure value P being 0 kPa or less in the process of S26, the control part 100 will determine that the negative pressure of the desulfurizer 4 is not eliminated, will return to S12 again, and will repeat the opening / closing control of S12-S24. . When the first electromagnetic valve 21 is opened next, the pressure in the tank 22 is negative, but the volume of the tank 22 is very small compared to the volume of the desulfurizer 4, so that the system on the supply source side The raw fuel that affects the fuel does not flow.

  On the other hand, when determining that the pressure value P is greater than 0 kPa in the process of S26, the control unit 100 determines that the negative pressure of the desulfurizer 4 has been eliminated, and opens the first electromagnetic valve 21 and the third electromagnetic valve 24. (Step S28). When the process of S28 is executed, the process shown in FIG. 3 is completed, the raw fuel desulfurized is supplied downstream of the desulfurizer 4, and the operation of the fuel cell system 1 is started as usual. The process shown in FIG. 3 is an example of the control process of the present invention. For example, the standby time of S14 and S22 may be changed as appropriate, and the threshold of S18 and the threshold of S26 may be changed as appropriate.

  Next, the operation and effect of the fuel cell system 1 according to this embodiment will be described. In the fuel cell system 1 according to the present embodiment, a first electromagnetic valve 21, a tank 22, and a second electromagnetic valve 23 are arranged in order from the upstream between the desulfurizer 4 and the raw fuel supply source. Further, the control unit 100 capable of controlling the first electromagnetic valve 21 and the second electromagnetic valve 23 is configured such that the first electromagnetic valve 23 is closed when the fuel cell system 1 is activated. The raw fuel is stored in the tank 22 by opening the valve 21. At this time, since the second electromagnetic valve 23 is closed, the raw fuel is temporarily stored in the tank 22 while preventing a large amount of raw fuel from flowing from the supply source into the desulfurizer 4 at one time. Can do. Next, after the raw fuel is stored in the tank 22, the first electromagnetic valve 21 is closed and the second electromagnetic valve 23 is opened, so that a large amount of raw fuel is supplied from the supply source to the desulfurizer 4 at a time. The raw fuel in the tank 22 can be supplied to the desulfurizer 4 while being prevented from flowing in. In this way, by supplying the raw fuel to the desulfurizer 4, the pressure in the desulfurizer 4 can be increased. Furthermore, the controller 100 can gradually increase the pressure in the desulfurizer 4 by repeatedly opening and closing the first electromagnetic valve 21 and the second electromagnetic valve 23, and finally eliminate the negative pressure in the desulfurizer 4. can do. In addition, the negative pressure in the desulfurizer 4 can be eliminated by only two valves disposed upstream of the desulfurizer 4 without providing a special device. As described above, it becomes possible to prevent the raw fuel from abruptly flowing into the desulfurizer 4 from the supply source at the start-up of the fuel cell system 1 at a low cost, thereby improving the reliability of the fuel cell system 1. Can do.

  Further, in the fuel cell system 1 according to the present embodiment, the fuel cell system 1 further includes a third electromagnetic valve 24 that is disposed on the downstream side of the desulfurizer 4 and that is controlled to be opened and closed by the control unit 100. The third electromagnetic valve 24 can be closed when the fuel cell system 1 is stopped, and the third electromagnetic valve 24 can be opened after the negative pressure in the desulfurizer 4 is eliminated when the fuel cell system 1 is started. As a result, it is possible to prevent the remaining gas from being adsorbed in the downstream piping of the desulfurizer 4 while the system is stopped. It can be limited only to the upstream side of the vessel 4.

  An embodiment of the present invention will be described with reference to FIG. FIG. 4 is a diagram showing the results of the example of the fuel cell system 1 of the present invention. In FIG. 4, a graph P showing the pressure value P detected by the pressure gauge 37, a graph V1 showing the open / closed state of the first electromagnetic valve 21, a graph V2 showing the open / closed state of the second electromagnetic valve 23, and a third A graph V3 showing the open / close state of the electromagnetic valve 24 is shown. The horizontal axis of FIG. 4 indicates time, the vertical axis indicates the pressure value (kPa) for the graph P, and indicates open / close for the graphs V1 to V3 (the upper stage is open and the lower stage is open). Is closed).

  First, in the initial state, the first solenoid valve 21 is closed as shown in the graph V1, the second solenoid valve 23 is closed as shown in the graph V2, and the first solenoid valve 21 is closed as shown in the graph V3. The three solenoid valves are closed. At this time, as shown in the graph P, the pressure value P becomes zero. Next, when the first electromagnetic valve 21 is opened as shown in the graph V1 and the closed state of the second electromagnetic valve 23 is maintained as shown in the graph V2, the raw fuel is stored in the tank 22 as shown in the graph P. As a result, the pressure value P increases. Thereafter, when the first electromagnetic valve 21 is closed as shown in the graph V1 and the second electromagnetic valve 23 is opened as shown in the graph V2, a small amount of raw fuel is supplied to the desulfurizer 4 as shown in the graph P. When supplied, the pressure value P becomes negative. The pressure value P at this time is eliminated from the pressure value around the desulfurizer 4 in the initial state by supplying a small amount of raw fuel. Thereafter, each time the opening / closing control of the first solenoid valve 21 and the second solenoid valve 23 is repeated, the negative pressure is gradually eliminated, and finally the negative pressure is eliminated at the position indicated by A in the figure. After the negative pressure is eliminated, the first solenoid valve 21, the second solenoid valve 23, and the third solenoid valve 24 are all opened, and the normal operation of the fuel cell system 1 is performed.

  The present invention is not limited to the embodiment described above.

  For example, in the above-described embodiment, the second electromagnetic valve 23 is closed when the fuel cell system 1 is stopped, but the second electromagnetic valve 23 may be opened. In the above-described embodiment, the third electromagnetic valve 24 is provided. However, the object of the present invention can be achieved with at least the first electromagnetic valve 21 and the second electromagnetic valve 23 alone, and the third electromagnetic valve can be achieved. The valve 24 may be omitted.

  DESCRIPTION OF SYMBOLS 1 ... Fuel cell system, 4 ... Desulfurizer, 21 ... 1st solenoid valve (1st valve), 22 ... Tank (storage part), 23 ... 2nd solenoid valve (2nd valve), 24 ... 3rd solenoid valve ( Third valve), 100... Control unit (control value output means).

Claims (2)

A desulfurizer for desulfurizing raw fuel,
A first valve disposed upstream of the desulfurizer;
A second valve disposed between the first valve and the desulfurizer;
A storage section that is disposed between the first valve and the second valve and stores the raw fuel;
Control means for controlling the opening and closing of each of the first valve and the second valve,
The control means, at the time of starting the system,
Storing the raw fuel in the reservoir by opening the first valve when the second valve is closed;
After the raw fuel is stored in the storage part, the first valve is closed and the second valve is opened to supply the raw fuel to the desulfurizer. . A third valve disposed downstream of the desulfurizer and controlled to be opened and closed by the control means;
The control means closes the third valve when the system is stopped, and opens the third valve after the negative pressure in the desulfurizer is eliminated when the system is started. Item 4. The fuel cell system according to Item 1.

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