JP2006318810A - Fuel gas storage apparatus and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel gas storage apparatus and a method of storing fuel gas in which heat radiation of fuel gas is conducted without decreasing a capacity of a storage container which stores fuel gas and a temperature rise of fuel gas is controlled. <P>SOLUTION: In a fuel gas storage apparatus 4, hydrogen gas from a fuel gas station 2 is not made to flow direct into a high-pressure hydrogen storage container 12 but is to be stored in a small tank 18 temporarily, and heat radiation of the hydrogen gas in the small tank 18 is to be conducted and then the hydrogen gas is to be made to flow into the high-pressure hydrogen storage container 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fuel gas storage device and method.

  Conventionally, it is known that when a fuel cell vehicle is filled with hydrogen from a hydrogen station corresponding to a gasoline station, the temperature of the hydrogen gas rises in a high-pressure gas storage container that stores hydrogen gas.

Therefore, a high-pressure gas storage container is known in which a heat exchange fin is provided inside and heat dissipation is performed by the heat exchange fin to suppress the temperature rise of hydrogen gas during filling (see, for example, Patent Document 1). Further, a hydrogen filling method is known in which the flow rate of hydrogen gas at the time of filling is made variable to suppress the temperature rise of the hydrogen gas in the high-pressure gas storage container (see, for example, Patent Document 2).
JP 2002-181295 A JP 2001-355595 A

  However, in the high-pressure gas storage container described in Patent Document 1, since the heat exchange fins are provided inside the container, the internal volume of the container decreases and the filling capacity decreases. Moreover, since the high-pressure gas storage container described in Patent Document 1 is covered with FRP (fiber reinforced plastic), it is difficult to dissipate heat. In addition, the filling method described in Patent Document 2 does not reduce the amount of heat of the hydrogen gas itself, and is not effective as a method for suppressing temperature rise.

  These problems are not limited to filling hydrogen gas into a high-pressure gas storage container, but also when filling other fuel gas that rises in temperature due to the Joule-Thompson effect when filling the high-pressure gas storage container. Is a similar problem.

  The present invention has been made in order to solve such a conventional problem, and an object of the present invention is to dissipate the fuel gas without reducing the volume of the storage container for storing the fuel gas, and An object of the present invention is to provide a fuel gas storage device and method capable of suppressing a temperature rise of gas.

  A fuel gas storage device of the present invention stores fuel gas in a fuel cell vehicle equipped with a fuel cell that generates power using fuel gas, and includes a first tank, a supply pipe, With a tank. The first tank stores fuel gas supplied to the fuel cell, and the supply pipe leads fuel gas supplied from the outside to the first tank. The second tank is provided on the supply pipe, and temporarily stores the fuel gas before the fuel gas supplied from the outside reaches the first tank to radiate heat.

  According to the present invention, since the fuel gas supplied from the outside is provided with the second tank for temporarily storing the fuel gas before it reaches the first tank and dissipating heat, the fuel gas is radiated and the first gas is discharged. It will be stored in the tank. For this reason, fuel gas can be dissipated without providing a heat exchange member in the first tank, and the internal volume of the container is not reduced by the heat exchange member and the filling capacity is not reduced. Further, even if the first tank has a configuration in which it is difficult to dissipate heat, there is no problem in heat dissipation. Further, since the amount of heat of the fuel gas itself is reduced, the temperature rise is effectively suppressed. Therefore, it is possible to radiate the fuel gas without reducing the volume of the storage container for storing the fuel gas, thereby suppressing the temperature rise of the fuel gas.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram of a fuel gas filling system including a fuel gas storage device according to an embodiment of the present invention. The fuel gas filling system 1 includes a fuel gas station 2 corresponding to a gasoline station, and a fuel gas storage device 4 that stores fuel gas in a fuel cell vehicle 3.

  The fuel gas station 2 supplies the fuel cell vehicle 3 with fuel gas necessary for traveling of the fuel cell vehicle 3. Here, hydrogen gas corresponds to the fuel gas, and the fuel gas station 2 fills the fuel gas storage device 4 with hydrogen gas.

  As shown in the figure, the fuel gas storage device 4 includes a fuel cell 10, a high-pressure hydrogen storage container (first tank) 12, a first pipe 14, a second pipe (supply pipe) 16, a small tank ( A second tank) 18, a pressure sensor 20, a first control valve 22, and a second control valve 24.

  The fuel cell 10 generates power using hydrogen gas, and supplies the generated power to a motor (not shown) to generate the driving force of the fuel cell vehicle 3. The high-pressure hydrogen storage container 12 stores hydrogen gas to be supplied to the fuel cell 10, and from the fuel gas station 2 until the pressure of the hydrogen gas in the container reaches the maximum operating pressure that is the pressure at the time of maximum filling. It is designed to accept and store hydrogen gas.

  The high-pressure hydrogen storage container 12 and the fuel cell 10 are connected by a first pipe 14. The first pipe 14 is generally provided with a pressure regulating valve (not shown), and the hydrogen gas in the high-pressure hydrogen storage container 12 is supplied to the fuel cell 10 according to the opening of the pressure regulating valve. It has become so.

  The second pipe 16 guides hydrogen gas supplied from the outside to the high-pressure hydrogen storage container 12. Accordingly, the hydrogen gas supplied from the fuel gas station 2 is filled into the high-pressure hydrogen storage container 12 through the pipe 16. A small tank 18 is provided on the second pipe 16. The small tank 18 temporarily stores the hydrogen gas before the hydrogen gas supplied from the outside reaches the high-pressure hydrogen storage container 12 to radiate heat. The small tank 18 is smaller than the high-pressure hydrogen storage container 12 and has higher pressure resistance, and heat exchange fins (heat exchange members) are provided inside and outside.

  Due to such a configuration, the hydrogen gas supplied from the fuel gas station 2 is temporarily stored in the small tank 18 for heat dissipation, and then reaches the high-pressure hydrogen storage container 12.

  The pressure sensor 20 detects the pressure of the fuel gas in the small tank 18. The first control valve 22 is provided on the second pipe 16 from the high-pressure hydrogen storage container 12 to the small tank 18, and opens or shuts off the flow path of the second pipe 16. The second control valve 24 is provided on the second pipe 16 from the outside to the small tank 18 and opens or shuts off the flow path of the pipe 16. The first control valve 22 and the second control valve 24 are configured to open or block the flow path according to the pressure detected by the pressure sensor 20.

  Further, the fuel gas storage device 4 includes a third pipe 26, an exhaust pure water tank 28, a pump 30, an air conditioner 32, and a fourth pipe 34. The third pipe 26 extends from the fuel cell 10 to the vicinity of the small tank 18, and an exhaust pure water tank 28 and a pump 30 are provided on the third pipe 26. The exhaust pure water tank 28 is a tank that stores reaction product water generated by the power generation reaction of the fuel cell 10. The pump 30 is for blowing the generated water in the waste pure water tank 28 to the small tank 18 through the third pipe 26.

  The air conditioner 32 is for adjusting the temperature in the passenger compartment of the fuel cell vehicle 3, and the fourth pipe 34 extends from the air conditioner 32 to the vicinity of the small tank 18. 18 is a pipe that leads to the vicinity of 18.

  Next, the outline of the fuel gas storage method of the fuel gas storage device 4 will be described with reference to FIG. 2A and 2B are explanatory views showing an outline of the fuel gas storage method according to the present embodiment. FIG. 2A shows how the first control valve 22 is opened and closed, and FIG. 2B shows how the second control valve 24 is opened and closed. (C) shows the pressure of the hydrogen gas in the high-pressure hydrogen storage container 12 and the small tank 18.

  First, as shown in FIGS. 2A and 2B, both the first control valve 22 and the second control valve 24 are open, and the supply of hydrogen gas from the fuel gas station 2 is started. Then, the pressure detected by the pressure sensor 20 increases. And the 1st control valve 22 will be in a closed state, when the pressure detected by the pressure sensor 20 is rising, and will interrupt | block a flow path (time t1).

  In addition, the pressure in the small tank 18 increases more rapidly by blocking the flow path. Furthermore, the hydrogen gas temporarily stored in the small tank 18 due to this pressure increase rises in temperature and becomes higher than the temperature of the hydrogen gas in the high-pressure hydrogen storage container 12. When the temperature of the hydrogen gas in the small tank 18 increases, the difference between the hydrogen gas and the outside air temperature increases, and the heat is naturally radiated. Further, the heat radiation of the hydrogen gas is promoted by the heat radiation fins inside and outside the small tank 18.

  Further, when the pressure of the small tank 18 is rising, water discharged from the fuel cell 10 is blown to the small tank 18, and air cooled by the air conditioner 32 of the fuel cell vehicle 3 is blown to the small tank 18. . Therefore, further heat dissipation is performed.

  Then, the value of the hydrogen pressure in the small tank 18 reaches the first pressure value set below the maximum operating pressure (time t2). At this time, the 1st control valve 22 will be in an open state, and will open a flow path. That is, the first control valve 22 opens the flow path before the pressure detected by the pressure sensor 20 reaches the maximum operating pressure. At time t2, the second control valve 24 is closed and the flow path is shut off. Therefore, at time t2, new hydrogen gas is not supplied, and the hydrogen gas in the small tank 18 is filled in the high-pressure hydrogen storage container 12. When the pressure in the small tank 18 is decreasing, the spraying of water discharged from the fuel cell 10 and the spraying of cooled air are stopped.

  Thereafter, the hydrogen gas in the small tank 18 is filled into the high-pressure hydrogen storage container 12, and the hydrogen gas pressures in the small tank 18 and the high-pressure hydrogen storage container 12 become equal. That is, the pressure detected by the pressure sensor 20 remains constant (time t3). At this time, the first control valve 22 is closed to block the flow path, and the second control valve 24 is opened to open the flow path. That is, the first control valve 22 keeps the flow path open until the pressure detected by the pressure sensor 20 remains constant after the flow path is opened. Further, in the stage where the pressure is kept constant, the spraying of the pure water and the cooling air are stopped, but the operation of the valves 22 and 24 supplies new hydrogen gas to the small tank 18 and the pressure sensor 20. Since the detected pressure increases, the spraying of the purified water and the cooling air are resumed.

  Thereafter, the fuel gas storage device 4 repeats the operation from time t1 to t3 described above. When the pressure detected by the pressure sensor 20 remains constant and the pressure value is equal to or higher than the second pressure value, which is a pressure value less than the first pressure value, both the first and second control valves 22 and 24 are Both are opened and the flow path is opened (time t4). That is, when the pressure at the time of keeping constant is equal to or higher than the second pressure value, the hydrogen gas is directly stored in the high pressure hydrogen storage container 12 without being temporarily stored in the small tank 18. For this reason, the heat release is hardly performed and the influence of the temperature rise of the hydrogen gas is considered, but since the pressure value is equal to or higher than the second pressure value, the influence of the temperature rise is small and the time until the completion of filling is shortened. .

  When the pressure value detected by the pressure sensor 20 reaches the maximum operating pressure, the supply of the hydrogen gas from the fuel gas station 2 is finished, and the filling of the hydrogen gas into the high-pressure hydrogen storage container 12 is finished. Become.

  Next, details of the fuel gas storage method according to the present embodiment will be described with reference to FIG. FIG. 3 is a flowchart showing the operation of the fuel gas storage device 4 according to this embodiment. In the flowchart shown in FIG. 3, a control unit (not shown) executes each process, and opens and closes the first and second control valves 24. Further, it is assumed that both the first control valve 22 and the second control valve 24 are in the open state at the start point of FIG.

  First, it is determined whether or not the pressure detected by the pressure sensor 20 is increasing (ST1). Here, when the supply of hydrogen gas from the fuel gas station 2 is started, the pressure detected by the pressure sensor 20 increases (ST1: YES), so the process moves to step ST2. On the other hand, when the detected pressure of the pressure sensor 20 does not increase (ST1: NO), this process is repeated until it is determined that the pressure has increased.

  In step ST2, the first control valve 22 is closed as shown at time t1 in FIG. 2 to block the flow path (ST2). As a result, the hydrogen gas is temporarily stored in the small tank 18 to dissipate heat. In addition, after the first control valve 22 is closed, water discharged from the fuel cell 10 is sprayed onto the small tank 18 and air cooled by the air conditioner 32 of the fuel cell vehicle 3 is sprayed onto the small tank 18. (ST3).

  Next, it is determined whether or not the detected pressure value of the pressure sensor 20 has reached the first pressure value (ST4). When it is determined that the detected pressure value has not reached the first pressure value (ST4: NO), this process is repeated until it is determined that the first pressure value has been reached. When it is determined that the value of the detected pressure has reached the first pressure value (ST4: YES), the first control valve 22 is opened and the second control valve is closed as shown at time t2 in FIG. A state is entered (ST5). Then, the spraying of the exhaust pure water and the cooling air is stopped (ST6).

  Next, it is determined whether or not the detected pressure of the pressure sensor 20 is constant (ST7). Here, when it is determined that it is not constant (ST7: NO), this process is repeated until it is determined that it is constant. On the other hand, when it is determined that the pressure is constant (ST7: YES), it is determined whether or not the pressure value that is constant is equal to or greater than the second pressure value (ST8).

  When it is determined that the constant pressure value is not equal to or higher than the second pressure value (ST8: NO), as shown at time t3 in FIG. 2, the first control valve 22 is closed and the second control valve is It will be in an open state (ST9). Then, the process returns to step ST3. Conversely, when it is determined that the constant pressure value is equal to or greater than the second pressure value (ST8: NO), the second control valve 24 is opened (ST10). Thereby, as shown also at the time t4 of FIG. 2, both the 1st and 2nd control valves 22 and 24 will be in an open state.

  Next, it is determined whether or not the detected pressure value of the pressure sensor 20 is the maximum operating pressure (ST11). When it is determined that the detected pressure value is not the maximum operating pressure (ST11: NO), this process is repeated until it is determined that the detected pressure value of the pressure sensor 20 is the maximum operating pressure. On the other hand, when it is determined that the value of the pressure detected by the pressure sensor 20 is the maximum operating pressure (ST11: YES), the hydrogen gas filling operation by the fuel gas storage device 4 ends.

  Thus, according to the fuel gas storage device 4 and the method according to the present embodiment, the hydrogen gas supplied from the outside temporarily stores the hydrogen gas until it reaches the high-pressure hydrogen storage container 12 to dissipate heat. Since the small tank 18 is provided, the hydrogen gas is radiated and stored in the high-pressure hydrogen storage container 12. For this reason, hydrogen gas can be dissipated without providing a heat exchange member in the high-pressure hydrogen storage container 12, and the internal volume of the container is not reduced by the heat exchange member and the filling capacity is not reduced. Moreover, even if the high-pressure hydrogen storage container 12 has a configuration in which it is difficult to perform heat dissipation, there is no problem in heat dissipation. Further, since the amount of heat of the hydrogen gas itself is reduced, the temperature rise is effectively suppressed. Therefore, the heat release of the hydrogen gas can be performed without reducing the volume of the storage container 12 that stores the hydrogen gas, and the temperature rise of the hydrogen gas can be suppressed.

  The small tank 18 is smaller than the high-pressure hydrogen storage container 12 and has a structure with improved pressure resistance. For this reason, the pressure of the hydrogen gas in the small tank 18 can be raised early, the difference between the temperature of the hydrogen gas in the small tank 18 and the outside air temperature is increased, and heat can be efficiently radiated.

  Moreover, since the small tank 18 has the heat exchange fin which has a heat exchange function, it can perform heat dissipation more efficiently.

  Further, in order to make the temperature of the hydrogen gas temporarily stored in the small tank 18 higher than the temperature of the hydrogen gas stored in the high-pressure hydrogen storage container 12, the temperature of the hydrogen gas and the outside air temperature in the small tank 18 are The difference between the two becomes large, and heat can be efficiently dissipated.

  In addition, since the first control valve 22 opens or shuts off the flow path according to the pressure detected by the pressure sensor 20, it is possible to automatically fill the high-pressure hydrogen storage container 12 with appropriately radiated hydrogen gas. .

  The first control valve 22 opens the flow path before the pressure detected by the pressure sensor 20 reaches the maximum operating pressure that is the pressure at the time of maximum filling of the high-pressure hydrogen storage container 12. . Here, the fuel gas station 2 corresponding to the gasoline station stops the supply of the hydrogen gas when the pressure of the hydrogen gas on the fuel cell vehicle side reaches the maximum operating pressure. For this reason, if the first control valve 22 is opened until the pressure in the small tank 18 reaches the maximum operating pressure, the hydrogen gas can be continuously supplied without stopping the supply of the hydrogen gas from the fuel gas station 2. Thus, the completion of hydrogen gas filling can be accelerated. In this case, as shown in FIG. 2B, the second control valve 24 may be throttled without being completely closed.

  Moreover, the 1st control valve 22 will interrupt | block a flow path, when the pressure detected by the pressure sensor 20 is rising. For this reason, when hydrogen gas is supplied from the outside and the internal pressure increases, the first control valve 22 is closed. Therefore, the hydrogen gas that has not been dissipated does not reach the high-pressure hydrogen storage container 12. Further, the opening of the flow path is maintained until the pressure detected by the pressure sensor 20 is kept constant after the flow path is opened. For this reason, when the one-end flow path is opened, the first control valve 22 is opened until the hydrogen gas reaches the high-pressure hydrogen storage container 12 and the pressure becomes constant. Therefore, the high-pressure hydrogen storage container 12 can be reliably filled with hydrogen gas. Therefore, it is possible to appropriately perform filling while suppressing the temperature rise by performing heat radiation.

  In addition, when the pressure detected by the pressure sensor 20 is rising, the air cooled by the air conditioner 32 of the fuel cell vehicle 3 is blown onto the small tank 18. For this reason, when hydrogen gas should be enclosed in the small tank 18 and heat radiation should be performed, the cooling air is blown to the small tank 18 and further heat radiation can be performed. In addition, when the pressure detected by the pressure sensor 20 is kept constant or decreases, the blowing of the air cooled by the air conditioner 32 of the fuel cell vehicle 3 to the small tank 18 is stopped. For this reason, the blowing of the cooling air is stopped when there is little need for heat dissipation, that is, the stage of sending the hydrogen gas in the small tank 18 to the high-pressure hydrogen storage container 12. Therefore, the support can be performed efficiently while supporting the heat dissipation.

  In addition, when the pressure detected by the pressure sensor 20 is rising, water discharged from the fuel cell 10 is sprayed onto the small tank 18. For this reason, when hydrogen gas should be enclosed in the small tank 18 and heat radiation should be performed, water can be sprayed onto the small tank 18 to further dissipate heat. In addition, when the pressure detected by the pressure sensor 20 remains constant or decreases, spraying of water discharged from the fuel cell 10 to the small tank 18 is stopped. For this reason, the spraying of water is stopped when there is little necessity for heat dissipation, ie, the stage of sending the hydrogen gas in the small tank 18 to the high-pressure hydrogen storage container 12. Therefore, the support can be efficiently performed while supporting the heat radiation.

  When the pressure detected by the pressure sensor 20 is constant, the first control valve 22 and the second control valve 24 are equal to or greater than a second pressure value that is a pressure value less than the first pressure value. Is supposed to open the flow path. That is, when the pressure becomes constant at or above the second pressure value, the first control valve 22 and the second control valve 24 are opened, and the hydrogen gas is sent directly to the high-pressure hydrogen storage container 12 without being temporarily stored in the small tank 18. It will be. For this reason, the heat release is hardly performed and the influence of the temperature rise of the hydrogen gas can be considered, but since the pressure value is equal to or higher than the second pressure value, the influence of the temperature rise is small, and the time until the filling is completed is shortened. Therefore, it is possible to shorten the time until the filling is completed with almost no influence of the temperature rise.

  As described above, the present invention has been described based on the embodiment, but the present invention is not limited to the above embodiment, and may be modified without departing from the gist of the present invention. For example, although hydrogen gas is mentioned as an example of hydrogen gas in the present embodiment, the present invention is not limited to this, and other hydrogen gas that rises in temperature due to the Joule-Thompson effect during gas filling may be used.

  In the present embodiment, the process shown in FIG. 3 is executed by a control unit (not shown). However, the present invention is not limited to this, and a similar operation may be executed by a mechanical configuration. Furthermore, in the present embodiment, the operation of closing the second control valve 24 may not be performed, and the second control valve 24 may be throttled.

1 is a configuration diagram of a fuel gas filling system including a fuel gas storage device according to an embodiment of the present invention. It is explanatory drawing which shows the outline of the fuel gas storage method which concerns on this embodiment, (a) shows the mode of opening and closing of a 1st control valve, (b) shows the mode of opening and closing of a 2nd control valve, (c ) Indicates the pressure of the hydrogen gas in the high-pressure hydrogen storage container and the small tank. It is a flowchart which shows operation | movement of the fuel gas storage apparatus which concerns on this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Fuel gas filling system 2 ... Fuel gas station 3 ... Fuel cell vehicle 4 ... Fuel gas storage apparatus 10 ... Fuel cell 12 ... High pressure hydrogen storage container (1st tank)
14 ... 1st piping 16 ... 2nd piping (supply piping)
18 ... Small tank (second tank)
DESCRIPTION OF SYMBOLS 20 ... Pressure sensor 22 ... 1st control valve 24 ... 2nd control valve 26 ... 3rd piping 28 ... Waste pure water tank 30 ... Pump 32 ... Air conditioner 34 ... 4th piping

Claims (11)

A fuel gas storage device that stores fuel gas in a fuel cell vehicle equipped with a fuel cell that generates power using fuel gas,
A first tank for storing fuel gas to be supplied to the fuel cell;
A supply pipe for guiding fuel gas supplied from the outside to the first tank;
A second tank that is provided on the supply pipe and that stores the fuel gas temporarily until the fuel gas supplied from the outside reaches the first tank;
A fuel gas storage device comprising:   2. The fuel gas storage device according to claim 1, wherein the second tank has a structure that is smaller than the first tank and has improved pressure resistance.   The fuel gas storage device according to claim 2, wherein the second tank has a heat exchange member having a heat exchange function.   The fuel gas storage device according to claim 2, wherein the temperature of the fuel gas temporarily stored in the second tank is set higher than the temperature of the fuel gas stored in the first tank. A pressure sensor for detecting the pressure of the fuel gas in the second tank;
A first control valve provided on a supply pipe from the second tank to the first tank and opening or shutting off a flow path of the pipe;
The fuel gas storage device according to any one of claims 1 to 4, wherein the first control valve opens or closes the flow path in accordance with a pressure detected by the pressure sensor. .   The first control valve opens the flow path before the pressure detected by the pressure sensor reaches a maximum operating pressure which is a pressure at the time of maximum filling of the first tank. 5. The fuel gas storage device according to 5.   The first control valve shuts off the flow path when the pressure detected by the pressure sensor is rising, and does not flow until the pressure detected by the pressure sensor remains constant after the flow path is opened. The fuel gas storage device according to claim 6, wherein the passage is maintained open.   When the pressure detected by the pressure sensor is rising, the air cooled by the air conditioner of the fuel cell vehicle is blown to the second tank, and the pressure detected by the pressure sensor is kept constant or decreases. The fuel gas storage device according to any one of claims 5 to 7, wherein the air cooled to the second tank by the air conditioner of the fuel cell vehicle is stopped.   Water discharged from the fuel cell is sprayed onto the second tank when the pressure detected by the pressure sensor is rising, and the fuel is detected when the pressure detected by the pressure sensor is kept constant or decreases. The fuel gas storage device according to any one of claims 5 to 8, wherein spraying of water discharged from the battery onto the second tank is stopped. A second control valve which is provided in a supply pipe from the outside to the second tank and opens or shuts off a flow path of the pipe;
When the pressure value detected by the pressure sensor reaches a first pressure value that is less than the maximum operating pressure, which is the pressure at the time of maximum filling of the first tank, the first control valve opens the flow path. And the second control valve blocks the flow path,
When the pressure detected by the pressure sensor remains constant, the first control valve shuts off the flow path, and the second control valve opens the flow path;
When the pressure value when the pressure detected by the pressure sensor is kept constant is equal to or greater than a second pressure value that is a pressure value less than the first pressure value, the first control valve and the second control valve are The fuel gas storage device according to any one of claims 5 to 9, wherein the flow path is opened. A fuel gas storage method for storing fuel gas in a fuel cell vehicle equipped with a fuel cell that generates power using fuel gas,
A fuel gas storage method comprising: temporarily storing fuel gas in a second tank to dissipate heat before supplying the fuel gas to a first tank that stores fuel gas supplied to the fuel cell.

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