JP6440545B2 - Accumulator unit, hydrogen station, and hydrogen filling method - Google Patents

Description

  The present invention relates to a pressure accumulator unit capable of storing hydrogen filled in a hydrogen fuel tank, a hydrogen station including the pressure accumulator unit, and a method for filling hydrogen into a hydrogen fuel tank from the pressure accumulator unit.

  Patent Document 1 discloses a technique for filling hydrogen (compressed hydrogen gas) into a hydrogen fuel tank (on-vehicle container) mounted on a vehicle such as a fuel cell vehicle (FCV). Specifically, Patent Document 1 discloses a compressed hydrogen gas filling device that fills a hydrogen fuel tank with hydrogen from a pressure accumulator unit. The accumulator unit includes a plurality of accumulator banks. In Patent Document 1, hydrogen of different pressure values is stored in each bank. Moreover, in patent document 1, at the time of hydrogen filling from the pressure accumulator unit to the hydrogen fuel tank, the hydrogen stored in the hydrogen fuel tank is filled with hydrogen stored in order from the pressure accumulator bank having a low pressure value.

JP 2008-064160 A

  By the way, when the hydrogen fuel tank is filled with hydrogen at the hydrogen station, the hydrogen in the hydrogen fuel tank is often considerably reduced. Therefore, as described in Patent Document 1, when hydrogen stored in the hydrogen fuel tank is filled in order from the pressure accumulator bank having a low pressure value, the hydrogen stored in the accumulator bank having a low pressure value is stored. Will be used first, and hydrogen stored in the high pressure accumulator bank will be used to make up for the lack. Therefore, when the hydrogen fuel tank is filled with hydrogen, the amount of hydrogen discharged from the pressure accumulator bank having a high pressure value is smaller than the amount of hydrogen discharged from the pressure accumulator bank having a low pressure value.

  However, the pressure accumulator bank having a high pressure value described in Patent Document 1 has a volume equivalent to that of the pressure accumulator bank having a low pressure value even though the amount of hydrogen discharged is relatively small. ) Is used. As described above, for a pressure accumulator bank having a high pressure value, an accumulator having an excessively large volume with respect to the amount of hydrogen discharged is often used, resulting in an increase in manufacturing cost of the accumulator itself. The manufacturing cost of the entire pressure accumulator unit has been increased.

In addition, if the volume of the pressure accumulator constituting the pressure accumulator bank having a high pressure value is excessively large, it takes time to replenish hydrogen to the pressure accumulator. It was difficult to boost the pressure quickly.
In view of such a situation, an object of the present invention is to reduce the manufacturing cost of the pressure accumulator unit and to improve the working efficiency when hydrogen is replenished to the pressure accumulator.

Therefore, in the first aspect of the present invention, the pressure accumulator unit can store hydrogen filled in the hydrogen fuel tank. The accumulator unit includes one or more first accumulators, which are cylindrical pressure vessels capable of storing hydrogen, and can fill the hydrogen fuel tank with hydrogen when the internal pressure of the hydrogen fuel tank is low. When the first pressure accumulator bank and one or more second pressure accumulators that are cylindrical pressure vessels capable of storing hydrogen are provided, and the internal pressure of the hydrogen fuel tank is higher than the low pressure state. The hydrogen fuel tank includes a second pressure accumulator bank that can be filled with hydrogen, and one or more third pressure accumulators that are cylindrical pressure vessels capable of storing hydrogen. And a third pressure accumulator bank capable of filling the hydrogen fuel tank with hydrogen when the intermediate pressure state is higher than the low pressure state and lower than the high pressure state. The volume of the third pressure accumulator is smaller than the volume of the first pressure accumulator and larger than the volume of the second pressure accumulator. The internal pressure of the third pressure accumulator is higher than the internal pressure of the first pressure accumulator and lower than the internal pressure of the second pressure accumulator. When filling the hydrogen fuel tank from the accumulator unit, the hydrogen from the first accumulator bank is first filled into the hydrogen fuel tank, and then the hydrogen from the third accumulator bank is filled into the hydrogen fuel tank. The hydrogen fuel tank is then filled with hydrogen from the second pressure accumulator bank. The time when the hydrogen fuel tank is filled with hydrogen from the second pressure accumulator bank is shorter than the time when the hydrogen fuel tank is filled with hydrogen from the third pressure accumulator bank. The time for filling the hydrogen fuel tank from the third pressure accumulator bank with hydrogen is shorter than the time for filling the hydrogen fuel tank with hydrogen from the first pressure accumulator bank.

  In a second aspect of the present invention, the hydrogen station includes the accumulator unit, and fills a hydrogen fuel tank with hydrogen stored in the accumulator unit.

In the third aspect of the present invention, as a method of filling hydrogen into a hydrogen fuel tank from an accumulator unit configured to include a plurality of accumulators each having a different volume, the large volume is increased along the order of the volume. In turn, filling the hydrogen fuel tank with the stored hydrogen, starting from the pressure accumulator. Here, the smaller the volume of the pressure accumulator, the higher the internal pressure of the pressure accumulator. In this method, the smaller the volume of the pressure accumulator, the shorter the time for filling the hydrogen fuel tank from the pressure accumulator with hydrogen.

  According to the first aspect and the second aspect of the present invention, the volume of the second pressure accumulator configuring the second pressure accumulator bank is the volume of the first pressure accumulator configuring the first pressure accumulator bank. Smaller than. Thereby, since the 2nd pressure accumulator can be restrained to the magnitude | size corresponding to the discharge amount of the hydrogen, the manufacturing cost of a 2nd pressure accumulator can be reduced, and the manufacturing cost of an accumulator unit by extension. Can be reduced. Moreover, since the second pressure accumulator can be quickly boosted by reducing the size of the second pressure accumulator when the second pressure accumulator is refilled with hydrogen, the working efficiency at the time of replenishing hydrogen to the second pressure accumulator is increased. Can be improved.

  According to the third aspect of the present invention, when hydrogen is charged from the pressure accumulator unit to the hydrogen fuel tank, the stored hydrogen is removed from the hydrogen accumulator in the order of the volume of the pressure accumulator in order from the large volume accumulator. Fill the tank. As a result, the pressure accumulator that can be used at the end of the hydrogen filling from the pressure accumulator unit to the hydrogen fuel tank can be reduced to a size corresponding to the amount of hydrogen discharged, thus reducing the manufacturing cost of the pressure accumulator. As a result, the manufacturing cost of the pressure accumulator unit can be reduced. In addition, by reducing the size of the pressure accumulator that can be used at the end stage, the pressure accumulator can be quickly boosted when hydrogen is replenished to the pressure accumulator, so that the work efficiency at the time of hydrogen replenishment to the pressure accumulator is improved. be able to.

The figure which shows the structure of the hydrogen station in 1st Embodiment of this invention. Side view and front view of the pressure accumulator unit in the first embodiment. The flowchart which shows an example of the hydrogen filling method to the hydrogen fuel tank from the pressure accumulator unit in the said 1st Embodiment. The figure which shows the relationship between the internal pressure of a hydrogen fuel tank at the time of hydrogen filling in the said 1st Embodiment, and time. The figure which shows the structure of the hydrogen station in 2nd Embodiment of this invention. Side view and front view of the pressure accumulator unit in the second embodiment. The figure which shows the structure of the hydrogen station in 3rd Embodiment of this invention. Side view and front view of the pressure accumulator unit in the third embodiment. The figure which shows the structure of the hydrogen station in 4th Embodiment of this invention. Side view and front view of the pressure accumulator unit in the fourth embodiment. The flowchart which shows an example of the hydrogen filling method from the pressure accumulator unit to the hydrogen fuel tank in the said 4th Embodiment. The figure which shows the relationship between the internal pressure of a hydrogen fuel tank at the time of hydrogen filling in the said 4th Embodiment, and time. The figure which shows the structure of the hydrogen station in 5th Embodiment of this invention. Side view and front view of the pressure accumulator unit in the fifth embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a hydrogen station in the first embodiment of the present invention. FIG. 2 (A) is a side view of the pressure accumulator unit constituting the hydrogen station, and FIG. 2 (B) is a front view of the pressure accumulator unit. Here, about FIG. 2 (A) and FIG. 2 (B), only the rack and the some accumulator which comprise an accumulator unit are illustrated.
In this embodiment, as an example of the hydrogen station according to the present invention, an off-site type hydrogen station to which hydrogen produced in another place is transported will be described. However, the configuration of the hydrogen station is not limited to this. Absent.

  As shown in FIG. 1, the hydrogen station 1 in this embodiment includes a compressor 2 that boosts hydrogen (hydrogen gas), a pressure accumulator unit 3 that can store the pressure boosted by the compressor 2, and a pressure accumulator unit. 3 is provided with a dispenser 6 that fills a hydrogen fuel tank 5 mounted on a vehicle 4 such as a fuel cell vehicle (FCV), and a control device 8.

  The pressure accumulator unit 3 has an inlet portion 3 a through which hydrogen flows into the pressure accumulator unit 3 and an outlet portion 3 b through which hydrogen flows out from the pressure accumulator unit 3. One end of the connecting pipe 9 is connected to the inlet 3 a of the pressure accumulator unit 3. The connecting pipe 9 is provided with a compressor 2 in the middle thereof. The other end of the connecting pipe 9 is connected to an unloading container 10 provided in the hydrogen station 1. The unloading container 10 is composed of, for example, a plurality of high-pressure hydrogen containers (not shown), and each of these high-pressure hydrogen containers can store, for example, 45 MPa of hydrogen. The unloading container 10 can be filled with hydrogen from a hydrogen transport container (not shown) transported by a transport vehicle such as a tractor or a truck. At the time of filling, hydrogen from the hydrogen transport container may be pressurized by a compressor (not shown) provided in the hydrogen station 1, and the pressurized hydrogen may be supplied to the unloading container 10. Here, the hydrogen transport container includes a hydrogen trailer, a hydrogen curdle, a hydrogen tank, and the like.

In the present embodiment, the unloading container 10 is connected to the other end of the connecting pipe 9, but instead, the other end of the connecting pipe 9 is configured to be detachable. In addition, the aforementioned hydrogen transport container may be attached. In this case, the aforementioned hydrogen transport container is connected to the pressure accumulator unit 3 via the connecting pipe 9.
One end of the connection pipe 11 is connected to the outlet 3 b of the pressure accumulator unit 3, and the other end of the connection pipe 11 is connected to the dispenser 6.

The accumulator unit 3 includes a low pressure bank 31, an intermediate pressure bank 32, and a high pressure bank 33. In the present embodiment, the accumulator unit 3 has a three-bank configuration including a low-pressure bank 31, an intermediate-pressure bank 32, and a high-pressure bank 33.
The low-pressure bank 31 may include one or more accumulators 311 that can store hydrogen. Here, this embodiment shows an example in which the low-pressure bank 31 includes one accumulator 311. In the fifth embodiment of the present invention described later, an example in which the low-pressure bank 31 includes a plurality of (for example, two) pressure accumulators 311 is shown. The fifth embodiment will be described later with reference to FIGS. 13 and 14.
The low pressure bank 31 can fill the hydrogen fuel tank 5 with hydrogen when the internal pressure of the hydrogen fuel tank 5 (in other words, the pressure of hydrogen in the hydrogen fuel tank 5) is in a low pressure state. Here, the pressure accumulator 311 corresponds to the “first pressure accumulator” of the present invention. The low pressure bank 31 corresponds to the “first pressure accumulator bank” of the present invention.

The intermediate pressure bank 32 may be configured to include one or more accumulators 321 capable of storing hydrogen. Here, this embodiment shows an example in which the intermediate pressure bank 32 includes one accumulator 321. In the fifth embodiment of the present invention described later, an example in which the intermediate pressure bank 32 includes a plurality of (for example, two) pressure accumulators 321 is shown.
The intermediate pressure bank 32 can fill the hydrogen fuel tank 5 with hydrogen when the internal pressure of the hydrogen fuel tank 5 is in an intermediate pressure state higher than the low pressure state. Here, the pressure accumulator 321 corresponds to the “third pressure accumulator” of the present invention. The intermediate pressure bank 32 corresponds to the “third accumulator bank” of the present invention.

The high pressure bank 33 may include one or more accumulators 331 capable of storing hydrogen. Here, this embodiment shows an example in which the high-pressure bank 33 includes one accumulator 331. In the fifth embodiment of the present invention described later, an example in which the high-pressure bank 33 includes a plurality of (for example, two) pressure accumulators 331 is shown.
The high pressure bank 33 can fill the hydrogen fuel tank 5 with hydrogen when the internal pressure of the hydrogen fuel tank 5 is higher than the intermediate pressure. Here, the pressure accumulator 331 corresponds to the “second pressure accumulator” of the present invention. The high-pressure bank 33 corresponds to the “second accumulator bank” of the present invention.

The accumulators 311 to 331 are accommodated in the three-stage rack 34 constituting the accumulator unit 3. In this embodiment, the pressure accumulator 311 is stored in the lower stage of the rack 34, the pressure accumulator 321 is stored in the middle stage of the rack 34, and the pressure accumulator 331 is stored in the upper stage of the rack 34.
The accumulators 311 to 331 are cylindrical high-pressure hydrogen containers. The accumulators 311 to 331 may be a composite pressure vessel formed by winding carbon fiber reinforced plastic (CFRP) around an inner vessel such as aluminum or resin, or may be a steel pressure vessel.

In the present embodiment, the volume of one pressure accumulator 321 is smaller than the volume of one pressure accumulator 311 and larger than the volume of one pressure accumulator 331.
In the present embodiment, each of the pressure accumulators 311 to 331 has the same shape in a cross section perpendicular to the longitudinal direction (that is, an annular shape), and the length in the longitudinal direction is different from each other. That is, the pressure accumulator 321 is shorter than the pressure accumulator 311 and longer than the pressure accumulator 331.
In this embodiment, for example, the volume of one pressure accumulator 311 is 300 liters, the volume of one pressure accumulator 321 is 230 liters, and the volume of one pressure accumulator 331 is 150 liters. The volumes of the containers 311 to 331 are not limited to these.

  In the present embodiment, the internal pressure of the pressure accumulator 321 (in other words, the pressure of hydrogen in the pressure accumulator 321) is higher than the internal pressure of the pressure accumulator 311 (in other words, the pressure of hydrogen in the pressure accumulator 311). Is set to The internal pressure of the pressure accumulator 331 (in other words, the hydrogen pressure in the pressure accumulator 331) is set to be higher than the internal pressure of the pressure accumulator 321.

  In the present embodiment, for example, the internal pressure of the pressure accumulator 311 is set to 60 MPa, the internal pressure of the pressure accumulator 321 is set to 70 MPa, and the internal pressure of the pressure accumulator 331 is set to 82 MPa. However, the setting of the internal pressure of the pressure accumulators 311 to 331 is not limited to these. In other words, in this embodiment, for example, the pressure accumulator 311 is set to store 60 MPa hydrogen, the pressure accumulator 321 is set to store 70 MPa hydrogen, and the pressure accumulator 331 stores 82 MPa hydrogen. However, the setting of the pressure of hydrogen stored in each of the pressure accumulators 311 to 331 is not limited to these.

  In the present embodiment, the set pressures of the pressure accumulators 311 to 331 are made different, but the set pressures of some or all of the pressure accumulators 311 to 331 may be set to be the same. Specifically, for example, each of the pressure accumulators 311 to 331 may be set to store 82 MPa of hydrogen. Alternatively, the pressure accumulator 311 may be set to store 60 MPa of hydrogen, and each of the pressure accumulators 321 and 331 may be set to store 82 MPa of hydrogen. Alternatively, each of the pressure accumulators 311 and 321 may be set to store 70 MPa of hydrogen, and the pressure accumulator 331 may be set to store 82 MPa of hydrogen.

  A dedicated valve mechanism (for example, an electromagnetic valve) 35 and a pressure detection unit 40 are provided at the inlet / outlet portion serving as the hydrogen filling port and the discharge port of each of the pressure accumulators 311 to 331. Each of the pressure accumulators 311 to 331 is connected to the pressure accumulator unit 3 via a dedicated valve mechanism 35 provided at the entrance and exit, and a check valve 36 and a valve mechanism 37 provided for each of the banks 31 to 33. It is connected to the inlet 3a. In addition, each of the pressure accumulators 311 to 331 is connected to a pressure accumulator unit via a dedicated valve mechanism 35 provided at the entrance and exit, and a valve mechanism 38 and a check valve 39 provided for each of the banks 31 to 33. 3 is connected to the outlet 3b. The check valve 36 prevents hydrogen from flowing from the banks 31 to 33 to the inlet 3a, and the check valve 39 prevents hydrogen from flowing from the outlet 3b to the banks 31 to 33. Is.

  Thereby, in the pressure accumulator unit 3, when the valve mechanism 37 and the valve mechanism 35 are selectively opened in a state where the valve mechanism 38 is closed, hydrogen boosted by the compressor 2 is supplied to the predetermined banks 31 to 33. When the valve mechanism 37 or the valve mechanism 35 filled in the pressure accumulators 311 to 331 is closed, the filling of hydrogen into the predetermined pressure accumulators 311 to 331 is stopped. Further, when the valve mechanism 38 and the valve mechanism 35 are selectively opened while the valve mechanism 37 is closed, hydrogen is released from the predetermined pressure accumulators 311 to 331 in the predetermined banks 31 to 33, and the valve mechanism is opened. When the valve 38 or the valve mechanism 35 is closed, the release of hydrogen from the predetermined pressure accumulators 311 to 331 is stopped. The valve mechanisms 35, 37, and 38 include, for example, an electromagnetic on-off valve and a flow rate adjustment valve.

The dispenser 6 is a device that can fill the hydrogen fuel tank 5 with hydrogen. Specifically, the dispenser 6 fills the hydrogen fuel tank 5 with hydrogen released from the pressure accumulators 311 to 331. The dispenser 6 receives information about the hydrogen fuel tank 5 from the vehicle 4 (internal pressure (residual pressure) P _f measured by a pressure sensor or the like, a preset maximum use pressure, etc.). . In the present embodiment, the hydrogen fuel tank 5 is configured to be able to be filled with, for example, 70 MPa hydrogen.

The control device 8 includes the internal pressure (residual pressure) of the pressure accumulators 311 to 331 detected by the pressure detector 40 and information (internal pressure P _f , maximum working pressure, etc.) regarding the hydrogen fuel tank 5 input to the dispenser 6. Various information is input. Then, the control device 8 appropriately controls the compressor 2, the valve mechanisms 35, 37, 38, and the like based on various input information and an operation command by the operator.

Here, an example of the hydrogen filling process to the hydrogen fuel tank 5 among various processes performed by the control device 8 will be described with reference to FIG.
FIG. 3 is a flowchart illustrating an example of a method for filling hydrogen from the pressure accumulator unit 3 to the hydrogen fuel tank 5 in the present embodiment. In this example, the internal pressure P _f of the hydrogen fuel tank 5 to reach 70 MPa, to fill the hydrogen to the hydrogen fuel tank 5.

Control unit 8, first, in step S1, the internal pressure P _f of the hydrogen fuel tank 5 determines whether the difference is less than the first threshold value P _L. Here, the first threshold value P _L, a threshold value for determining whether to hydrogen charging from the low pressure bank 31 to the hydrogen fuel tank 5, is set in advance. Here, the first threshold value P _L , the second threshold value P _M described later, and the third threshold value P _H described later are set in advance so as to satisfy the following expression (1).
P _L <P _M <P _H (1)
In the present embodiment, for example, the first threshold value P _L is 40 MPa, the second threshold value P _M is 60 MPa, and the third threshold value P _H is 70 MPa, but the threshold values P _L , P _M , P _H is not limited to these values.

If the internal pressure P _f of the hydrogen fuel tank 5 is smaller than the first threshold value P _L in step S1, it is determined that hydrogen filling from the low pressure bank 31 to the hydrogen fuel tank 5 is performed, and the process proceeds to step S2, where the low pressure bank The hydrogen fuel tank 5 is filled with hydrogen by differential pressure filling from 31 (pressure accumulator 311). The hydrogen filling from the low pressure bank 31 to the hydrogen fuel tank 5, the internal pressure P _f of the hydrogen fuel tank 5 is continued until it reaches the first threshold value P _L. Further, when the hydrogen filling, compared with the internal pressure P _f and the first threshold value P _L of the hydrogen fuel tank 5 is intermittently performed.

When the internal pressure P _f of the hydrogen fuel tank 5 reaches the first threshold value P _L, stop filling hydrogen from the low-pressure bank 31 to the hydrogen fuel tank 5, the process proceeds to step S3.
In step S3, the internal pressure P _f of the hydrogen fuel tank 5 is equal to or second threshold value P _M or less. Here, the second threshold value P _M, a threshold value for determining whether to hydrogen filling from the intermediate pressure bank 32 to the hydrogen fuel tank 5, is set in advance.

When the internal pressure P _f of the hydrogen fuel tank 5 is less than the second threshold value P _M at step S3, determines to perform the hydrogen filling from the intermediate pressure bank 32 to the hydrogen fuel tank 5, the process proceeds to step S4, Medium Hydrogen is filled from the pressure bank 32 (accumulator 321) to the hydrogen fuel tank 5 by differential pressure filling. The medium pressure hydrogen filling from the bank 32 to the hydrogen fuel tank 5, the internal pressure P _f of the hydrogen fuel tank 5 is continued until it reaches the second threshold value P _M. Further, when the hydrogen filling, compared with the internal pressure P _f and the second threshold value P _M of the hydrogen fuel tank 5 is intermittently performed.

When the internal pressure P _f of the hydrogen fuel tank 5 reaches the second threshold value P _M, to stop the hydrogen filling from the intermediate pressure bank 32 to the hydrogen fuel tank 5, the process proceeds to step S5.
In step S5, the internal pressure P _f of the hydrogen fuel tank 5 is equal to or third threshold value P or _H smaller. Here, the third threshold value P _H, a threshold value for determining whether to filling hydrogen from the high-pressure bank 33 to the hydrogen fuel tank 5, is set in advance.

When the internal pressure P _f of the hydrogen fuel tank 5 is less than the third threshold value P _H at step S5, determines to perform the hydrogen filling from the high pressure bank 33 to the hydrogen fuel tank 5, the process proceeds to step S6, a high pressure bank The hydrogen fuel tank 5 is filled with hydrogen by differential pressure filling from 33 (pressure accumulator 331). The hydrogen filling from the high pressure bank 33 to the hydrogen fuel tank 5, the internal pressure P _f of the hydrogen fuel tank 5 is continued until it reaches the third threshold value P _H. Further, when the hydrogen filling, compared with the internal pressure P _f and the third threshold value P _H of the hydrogen fuel tank 5 is intermittently performed.

When the internal pressure P _f of the hydrogen fuel tank 5 reaches a third threshold value P _H, stop filling hydrogen from the high-pressure bank 33 to the hydrogen fuel tank 5, ends the hydrogen filling from the pressure accumulator unit 3 to the hydrogen fuel tank 5 To do.

FIG. 4 shows how the internal pressure P _f of the hydrogen fuel tank 5 is changed from the pressure P ₀ smaller than the first threshold value P _{L to} the first pressure P ₀ using the hydrogen filling method from the pressure accumulator unit 3 to the hydrogen fuel tank 5 shown in FIG. when pressurized to 3 threshold P _H, is a diagram showing the relationship between the internal pressure P _f and time of the hydrogen fuel tank 5.
Here, the time t _L from time t ₀ to time t ₁ shown in FIG. 4 is the time required to increase the internal pressure P _f of the hydrogen fuel tank 5 from the pressure P ₀ to the first threshold value P _L. . At this time t _L , the hydrogen fuel tank 5 is filled with hydrogen from the low pressure bank 31 (pressure accumulator 311).

The time t _M from time t ₁ to time t _{2 is} the time required to increase the internal pressure P _f of the hydrogen fuel tank 5 from the first threshold value P _L to the second threshold value P _M. In the time _{t M,} hydrogen is charged from medium pressure bank 32 (accumulator 321) to the hydrogen fuel tank 5.
The time _{t H} from time _{t 2} to time _{t 3,} the internal pressure _{P f} of the hydrogen fuel tank 5, a time required for the step-up from the second threshold value _{P M} to the third threshold value _{P H.} At this time t _H , hydrogen is filled from the high-pressure bank 33 (pressure accumulator 331) into the hydrogen fuel tank 5.

As shown in FIG. 4, shorter than the time _{t H} is the time _{t M,} the time _{t M} shorter than the time _{t L.} This tendency is the same for the amount of hydrogen dispensed in each of the banks 31-33. That is, the amount of hydrogen discharged from the high pressure bank 33 is smaller than the amount of hydrogen discharged from the intermediate pressure bank 32, and the amount of hydrogen discharged from the intermediate pressure bank 32 is smaller than the amount of hydrogen discharged from the low pressure bank 31. Therefore, in this embodiment, the volume of the pressure accumulator (bank) with a smaller amount of hydrogen dispensed is smaller. Thereby, since the pressure accumulator can be suppressed to a size corresponding to the amount of hydrogen discharged, the manufacturing cost of the pressure accumulator can be reduced, and consequently the manufacturing cost of the pressure accumulator unit 3 can be reduced. it can. In addition, since the pressure accumulator can be quickly boosted when the accumulator is refilled with hydrogen, the working efficiency when the accumulator is refilled with hydrogen can be improved.

According to the present embodiment, the pressure accumulator unit 3 can store hydrogen filled in the hydrogen fuel tank 5. Accumulator unit 3, hydrogen is configured to include a storable one or more accumulator 311 (first accumulator), the internal pressure P _f of the hydrogen fuel tank 5 is low pressure (e.g., shown in FIG. 4 the first threshold value P low bank 31 fillable hydrogen to the hydrogen fuel tank 5 when _L less than a is a state) (first accumulator bank), which can store hydrogen at least one accumulator 331 is configured to include a (second accumulator), the internal pressure P _f of the hydrogen fuel tank 5, the high-pressure state than a low pressure (for example, a second threshold value P _M or more shown in FIG. 4, and comprises a third threshold value P _H less than a which is state) high pressure bank 33 fillable hydrogen to the hydrogen fuel tank 5 when it (second accumulator bank), the. The volume of the pressure accumulator 331 is smaller than the volume of the pressure accumulator 311. Thereby, since the pressure accumulator 331 can be suppressed to a size corresponding to the amount of hydrogen discharged, the manufacturing cost of the pressure accumulator 331 can be reduced, and consequently the manufacturing cost of the pressure accumulator unit 3 can be reduced. be able to. Moreover, since the pressure accumulator 331 can be quickly boosted when the accumulator 331 is refilled with hydrogen due to the downsizing of the accumulator 331, the working efficiency when the accumulator 331 is refilled with hydrogen can be improved.

Further, according to the present embodiment, the pressure accumulator unit 3 includes one or more pressure accumulators 321 (third pressure accumulator) capable of storing hydrogen, and the internal pressure P _f of the hydrogen fuel tank 5 is the higher than a low pressure, and the pressure condition within less than a high pressure (for example, a first threshold value P _L or more shown in FIG. 4, and the state is less than the second threshold value P _M) is The hydrogen fuel tank 5 is sometimes further provided with an intermediate pressure bank 32 (third pressure accumulator bank) that can be filled with hydrogen. As a result, even if the internal pressure of the pressure accumulator 311 is reduced when the hydrogen fuel tank 5 is filled with hydrogen from the low pressure bank 31 and the flow rate of hydrogen is reduced, the low pressure bank 31 is smoothly switched from the low pressure bank 31 to the intermediate pressure bank 32. The filling of hydrogen into the tank 5 can be continued.

  According to the present embodiment, the pressure accumulator 321 (third pressure accumulator) has a volume smaller than that of the pressure accumulator 311 (first pressure accumulator) and the pressure accumulator 331 (second pressure accumulator). Larger than the volume of the container. Thereby, since the pressure accumulators 311 to 331 can be suppressed to a size corresponding to the amount of each hydrogen dispensed, the manufacturing cost of the pressure accumulators 311 to 331 can be reduced.

  Moreover, according to this embodiment, the internal pressure of the pressure accumulator 321 (third pressure accumulator) is higher than the internal pressure of the pressure accumulator 311 (first pressure accumulator). Thereby, higher pressure hydrogen can be discharged from the pressure accumulator 321 (intermediate pressure bank 32) after discharge of hydrogen from the pressure accumulator 311 (low pressure bank 31).

  Moreover, according to this embodiment, the internal pressure of the pressure accumulator 321 (third pressure accumulator) is lower than the internal pressure of the pressure accumulator 331 (second pressure accumulator). Thereby, higher pressure hydrogen can be discharged from the pressure accumulator 331 (high pressure bank 33) after the hydrogen is discharged from the pressure accumulator 321 (intermediate pressure bank 32).

  Further, according to the present embodiment, when the hydrogen fuel tank 5 is filled with hydrogen from the pressure accumulator unit 3, first, hydrogen from the low pressure bank 31 (first pressure accumulator bank) is filled into the hydrogen fuel tank 5 (step S2). Next, hydrogen from the intermediate pressure bank 32 (third pressure accumulator bank) is filled in the hydrogen fuel tank 5 (step S4), and then hydrogen from the high pressure bank 33 (second pressure accumulator bank). Is filled in the hydrogen fuel tank 5 (step S6). By thus filling the hydrogen fuel tank 5 with hydrogen from the pressure accumulator unit 3, it is possible to suppress an excessive increase in the differential pressure between the pressure accumulator unit 3 (banks 31 to 33) and the hydrogen fuel tank 5. Therefore, heat generation in the hydrogen fuel tank 5 at the time of hydrogen filling due to the Joule-Thomson effect and adiabatic compression can be suppressed.

  According to the present embodiment, the hydrogen fuel tank 5 is mounted on a vehicle 4 such as a fuel cell vehicle (FCV). Thereby, the hydrogen fuel tank 5 mounted on the vehicle 4 can be efficiently filled with hydrogen from the pressure accumulator unit 3.

  According to the present embodiment, the hydrogen station 1 includes the pressure accumulator unit 3 and fills the hydrogen fuel tank 5 with the hydrogen stored in the pressure accumulator unit 3. As a result, the hydrogen station 1 can quickly increase the pressure of the high-pressure bank 33 when the high-pressure bank 33 (accumulator 331) constituting the accumulator unit 3 is replenished with hydrogen. Work efficiency can be improved.

  Moreover, according to this embodiment, the hydrogen station 1 is further provided with the compressor 2 which pressurizes hydrogen. The pressure accumulators 311 to 331 constituting the pressure accumulator unit 3 can store hydrogen boosted by the compressor 2. Thereby, in this embodiment, the compressed hydrogen gas of about 82 MPa can be stored in the pressure accumulators 311 to 331, for example.

  Moreover, according to this embodiment, as a method of filling the hydrogen fuel tank 5 with hydrogen from the pressure accumulator unit 3 including a plurality of pressure accumulators 311 to 331 having different volumes, the volume of the pressure accumulators 311 to 331 is used. In this order, the hydrogen storage tank 5 is filled with the stored hydrogen in order from the large volume accumulator (for example, in the order of the accumulator 311, the accumulator 321, and the accumulator 331). Accordingly, when the hydrogen fuel tank 5 is filled with hydrogen from the pressure accumulator unit 3, the pressure accumulator 331 that can be used at the end of the pressure accumulator unit 3 can be suppressed to a size corresponding to the hydrogen discharge amount. The manufacturing cost can be reduced, and consequently the manufacturing cost of the pressure accumulator unit 3 can be reduced. Further, by reducing the size of the pressure accumulator 331 that can be used in the end stage, the pressure accumulator 331 can be quickly boosted when the accumulator 331 is refilled with hydrogen, so that the work efficiency when the accumulator 331 is refilled with hydrogen is improved. Can be made.

  Moreover, according to this embodiment, the internal pressure of the pressure accumulators 311 to 331 is higher as the volume is smaller. Thereby, it is possible to prevent the differential pressure between the pressure accumulator unit 3 (banks 31 to 33) and the hydrogen fuel tank 5 from becoming excessively large when hydrogen is charged from the pressure accumulator unit 3 to the hydrogen fuel tank 5. Therefore, heat generation in the hydrogen fuel tank 5 at the time of hydrogen filling due to the Joule-Thomson effect and adiabatic compression can be suppressed.

FIG. 5 is a diagram showing the configuration of the hydrogen station in the second embodiment of the present invention. FIG. 6 (A) is a side view of the pressure accumulator unit constituting the hydrogen station, and FIG. 6 (B) is a front view of the pressure accumulator unit. Here, about FIG. 6 (A) and FIG. 6 (B), only the rack and the several accumulator which comprise an accumulator unit are illustrated.
Differences from the first embodiment will be described.

In this embodiment, the volume of one pressure accumulator 321 is larger than the volume of one pressure accumulator 331 and is the same as the volume of one pressure accumulator 311.
In this embodiment, the shape of each of the pressure accumulators 311 to 331 in the cross section perpendicular to the longitudinal direction is the same (that is, annular), the length of the pressure accumulators 311 and 321 in the longitudinal direction, and the pressure accumulator The lengths of 331 in the longitudinal direction are different from each other. That is, the pressure accumulators 311 and 321 are longer than the pressure accumulator 331.
In this embodiment, for example, the volume of one pressure accumulator 311 and the volume of one pressure accumulator 321 are each 300 liters, and the volume of one pressure accumulator 331 is 150 liters. The volumes of 311 to 331 are not limited to these.

  In particular, according to the present embodiment, the volume of the pressure accumulator 321 (third pressure accumulator) is the same as the volume of the pressure accumulator 311 (first pressure accumulator). Thereby, since the thing of the same dimension as the accumulator 311 can be used as the accumulator 321, for example, the accumulator 311 is switched for the intermediate pressure bank 32, and the accumulator 321 is switched for the low pressure bank 31, The accumulator unit 3 can be operated. Therefore, the choice of the operation mode of the pressure accumulator unit 3 can be increased.

FIG. 7 is a diagram showing a configuration of a hydrogen station in the third embodiment of the present invention. FIG. 8A is a side view of the pressure accumulator unit constituting the hydrogen station, and FIG. 8B is a front view of the pressure accumulator unit. Here, about FIG. 8 (A) and FIG. 8 (B), only the rack and the some accumulator which comprise an accumulator unit are illustrated.
Differences from the first embodiment will be described.

In this embodiment, the volume of one pressure accumulator 321 is smaller than the volume of one pressure accumulator 311 and is the same as the volume of one pressure accumulator 331.
In this embodiment, the shape of each of the accumulators 311 to 331 in the cross section perpendicular to the longitudinal direction is the same (that is, an annular shape), the length of the accumulator 311 in the longitudinal direction, the accumulator 321, The lengths of 331 in the longitudinal direction are different from each other. That is, the pressure accumulator 311 is longer than the pressure accumulators 321 and 331.
In this embodiment, for example, the volume of one pressure accumulator 311 is 300 liters, and the volume of one pressure accumulator 321 and the volume of one pressure accumulator 331 are 150 liters, respectively. The volumes of 311 to 331 are not limited to these.

  In particular, according to the present embodiment, the volume of the pressure accumulator 321 (third pressure accumulator) is the same as the volume of the pressure accumulator 331 (second pressure accumulator). Thereby, since the thing of the same dimension as the pressure accumulator 331 can be used as the pressure accumulator 321, for example, the accumulator 331 is switched for the intermediate pressure bank 32, and the accumulator 321 is switched for the high pressure bank 33, The accumulator unit 3 can be operated. Therefore, the choice of the operation mode of the pressure accumulator unit 3 can be increased.

FIG. 9 is a diagram showing the configuration of the hydrogen station in the fourth embodiment of the present invention. FIG. 10 (A) is a side view of the pressure accumulator unit constituting the hydrogen station, and FIG. 10 (B) is a front view of the pressure accumulator unit. Here, about FIG. 10 (A) and FIG. 10 (B), only the rack and the several accumulator which comprise an accumulator unit are illustrated.
Differences from the first embodiment will be described.

In the present embodiment, the above-described intermediate pressure bank 32 is omitted, and the accumulator unit 3 has a two-bank configuration including a low pressure bank 31 and a high pressure bank 33.
In the present embodiment, the rack 34 is of a two-stage type, and the rack 34 stores pressure accumulators 311 and 331. In the present embodiment, the pressure accumulator 311 is housed in the lower stage of the rack 34, and the pressure accumulator 331 is housed in the upper stage of the rack 34.

  In this embodiment, for example, the internal pressure of the pressure accumulator 311 is set to be 70 MPa, and the internal pressure of the pressure accumulator 331 is set to be 82 MPa, but the internal pressure settings of the pressure accumulators 311 and 331 are set to these. Not exclusively. In other words, in this embodiment, for example, the pressure accumulator 311 is set to store 70 MPa hydrogen and the pressure accumulator 331 is set to store 82 MPa hydrogen. The setting of the pressure of hydrogen stored in each is not limited to these.

  In the present embodiment, the set pressures of the pressure accumulators 311 and 331 are different, but the set pressures of all the pressure accumulators 311 and 331 may be set to be the same. Specifically, for example, each of the pressure accumulators 311 and 331 may be set to store 82 MPa of hydrogen.

FIG. 11 is a flowchart showing an example of a method for filling hydrogen from the pressure accumulator unit 3 to the hydrogen fuel tank 5 in the present embodiment. In this example, the internal pressure P _f of the hydrogen fuel tank 5 to reach 70 MPa, to fill the hydrogen to the hydrogen fuel tank 5.

The hydrogen filling method from the pressure accumulator unit 3 to the hydrogen fuel tank 5 shown in FIG. 11 is step S3 of the hydrogen filling method from the pressure accumulator unit 3 to the hydrogen fuel tank 5 in the first embodiment shown in FIG. And step S4 is omitted. Here, in the present embodiment, for example, the first threshold P _L is 60 MPa and the third threshold P _H is 70 MPa, but the thresholds P _L and P _H are not limited to these values.

FIG. 12 shows how the internal pressure P _f of the hydrogen fuel tank 5 is changed from the pressure P ₀ smaller than the first threshold value P _{L to} the first pressure P ₀ using the hydrogen filling method from the pressure accumulator unit 3 to the hydrogen fuel tank 5 shown in FIG. when pressurized to 3 threshold P _H, is a diagram showing the relationship between the internal pressure P _f and time of the hydrogen fuel tank 5.
Here, the time t _L from time t ₀ to time t ₁₁ shown in FIG. 12 is the time required to increase the internal pressure P _f of the hydrogen fuel tank 5 from the pressure P ₀ to the first threshold value P _L. . At this time t _L , the hydrogen fuel tank 5 is filled with hydrogen from the low pressure bank 31 (pressure accumulator 311).

The time _{t H} from time _{t 11} to time _{t 12,} the internal pressure _{P f} of the hydrogen fuel tank 5, a time required for the step-up from the first threshold value _{P L} to the third threshold value _{P H.} At this time t _H , hydrogen is filled from the high-pressure bank 33 (pressure accumulator 331) into the hydrogen fuel tank 5.

As shown in FIG. 12, the time t _H is shorter than the time t _L. This tendency is the same for the amount of hydrogen dispensed in each of the banks 31 and 33. That is, the amount of hydrogen discharged from the high-pressure bank 33 is smaller than the amount of hydrogen discharged from the low-pressure bank 31. Therefore, in this embodiment, the volume of the pressure accumulator (bank) with a smaller amount of hydrogen dispensed is smaller. Thereby, since the pressure accumulator can be suppressed to a size corresponding to the amount of hydrogen discharged, the manufacturing cost of the pressure accumulator can be reduced, and consequently the manufacturing cost of the pressure accumulator unit 3 can be reduced. it can. In addition, since the pressure accumulator can be quickly boosted when the accumulator is refilled with hydrogen, the working efficiency when the accumulator is refilled with hydrogen can be improved.

  In particular, according to the present embodiment, when hydrogen is charged from the accumulator unit 3 to the hydrogen fuel tank 5, hydrogen from the high-pressure bank 33 (second accumulator bank) is filled into the hydrogen fuel tank 5 (step S6). Prior to this, hydrogen from the low pressure bank 31 (first accumulator bank) is filled into the hydrogen fuel tank 5 (step S2). By thus filling the hydrogen fuel tank 5 with hydrogen from the pressure accumulator unit 3, it is possible to suppress an excessive increase in the differential pressure between the pressure accumulator unit 3 (banks 31 and 33) and the hydrogen fuel tank 5. Therefore, heat generation in the hydrogen fuel tank 5 at the time of hydrogen filling due to the Joule-Thomson effect and adiabatic compression can be suppressed.

  Moreover, according to this embodiment, the internal pressure of the pressure accumulator 331 (second pressure accumulator) is higher than the internal pressure of the pressure accumulator 311 (first pressure accumulator). Thereby, higher pressure hydrogen can be discharged from the pressure accumulator 331 (high pressure bank 33) after the hydrogen is discharged from the pressure accumulator 311 (low pressure bank 31).

FIG. 13 is a diagram showing a configuration of a hydrogen station in the fifth embodiment of the present invention. FIG. 14A is a side view of a pressure accumulator unit constituting the hydrogen station, and FIG. 14B is a front view of the pressure accumulator unit. Here, about FIG. 14 (A) and FIG. 14 (B), only the rack and the several accumulator which comprise an accumulator unit are illustrated.
Differences from the first embodiment will be described.

In the present embodiment, the low-pressure bank 31 includes a plurality of (for example, two) pressure accumulators 311. The intermediate pressure bank 32 includes a plurality of (for example, two) accumulators 321. The high pressure bank 33 includes a plurality of (for example, two) pressure accumulators 331. Thus, each of the banks 31 to 33 can be constituted by a plurality of pressure accumulators.
In the second to fourth embodiments described above, it goes without saying that each bank may be composed of a plurality of pressure accumulators as in the present embodiment.

  In the first to fifth embodiments described above, the number of pressure accumulators constituting each bank is the same. However, the number of pressure accumulators constituting each bank may be different for each bank.

  In the first to fifth embodiments described above, the pressure accumulators 311 to 331 are each provided with an inlet / outlet portion serving as a hydrogen filling port and a discharge port on one end side in the longitudinal direction. The configuration of the vessel is not limited to this. For example, the pressure accumulators 311 to 331 may include an inlet portion serving as a hydrogen filling port on one end side in the longitudinal direction and an outlet portion serving as a hydrogen discharge port on the other end side. Good. In this case, the valve mechanism 35 and the pressure detector 40 described above are provided at both the inlet and outlet of the pressure accumulators 311 to 331. In addition, each of the pressure accumulators 311 to 331 is connected to a pressure accumulator unit via a dedicated valve mechanism 35 provided at an inlet portion thereof, and a check valve 36 and a valve mechanism 37 provided for each of the banks 31 to 33. 3 is connected to the inlet 3a. Further, each of the pressure accumulators 311 to 331 is connected to a pressure accumulator unit via a dedicated valve mechanism 35 provided at the outlet portion thereof, and a valve mechanism 38 and a check valve 39 provided for each of the banks 31 to 33. 3 outlets 3b.

  In the first to fifth embodiments described above, the accumulator unit 3 has a two-bank configuration or a three-bank configuration. However, the configuration of the accumulator unit 3 is not limited to these, and the accumulator unit 3 has four configurations. You may comprise by the above bank.

  In the first to fifth embodiments described above, as an example of the hydrogen station according to the present invention, an off-site type hydrogen station to which hydrogen produced in another place is transported has been described. The configuration is not limited to this, and may be, for example, an on-site type hydrogen station that produces hydrogen on the spot. Alternatively, it may be a hydrogen station having both off-site and on-site functions.

As can be seen from the above, the first to fifth embodiments described above are merely illustrative of the present invention, and the present invention is within the scope of the claims in addition to those directly shown by the described embodiments. Needless to say, the present invention includes various improvements and modifications made by those skilled in the art.
The claims at the beginning of the application were as follows.
Claim 1:
A pressure accumulator unit capable of storing hydrogen filled in a hydrogen fuel tank,
A first pressure accumulator bank configured to include one or more first pressure accumulators capable of storing hydrogen and capable of filling the hydrogen fuel tank with hydrogen when the internal pressure of the hydrogen fuel tank is in a low pressure state When,
One or more second pressure accumulators capable of storing hydrogen are configured, and the hydrogen fuel tank can be filled with hydrogen when the internal pressure of the hydrogen fuel tank is higher than the low pressure state. A second accumulator bank,
With
The second pressure accumulator is a pressure accumulator unit having a volume smaller than that of the first pressure accumulator.
Claim 2:
When one or more third pressure accumulators capable of storing hydrogen are included, and the internal pressure of the hydrogen fuel tank is higher than the low pressure state and lower than the high pressure state. The accumulator unit according to claim 1, further comprising a third accumulator bank capable of filling the hydrogen fuel tank with hydrogen.
Claim 3:
The accumulator unit according to claim 2, wherein the third accumulator has a volume smaller than that of the first accumulator and larger than that of the second accumulator.
Claim 4:
The pressure accumulator unit according to claim 2, wherein the third pressure accumulator has the same volume as that of the first pressure accumulator.
Claim 5:
The accumulator unit according to claim 2, wherein the third accumulator has the same volume as that of the second accumulator.
Claim 6:
The accumulator unit according to any one of claims 2 to 5, wherein the third accumulator has an internal pressure higher than an internal pressure of the first accumulator.
Claim 7:
The accumulator unit according to any one of claims 2 to 6, wherein an inner pressure of the third accumulator is lower than an inner pressure of the second accumulator.
Claim 8:
When filling the hydrogen fuel tank from the pressure accumulator unit, first, the hydrogen from the first pressure accumulator bank is filled into the hydrogen fuel tank, and then the hydrogen from the third pressure accumulator bank is filled. The accumulator unit according to any one of claims 2 to 7, wherein the hydrogen fuel tank is filled, and then hydrogen from the second accumulator bank is filled into the hydrogen fuel tank.
Claim 9:
The pressure accumulator unit according to claim 1, wherein the second pressure accumulator has an internal pressure higher than an internal pressure of the first pressure accumulator.
Claim 10:
When filling the hydrogen fuel tank from the pressure accumulator unit, the hydrogen from the first pressure accumulator bank is filled with the hydrogen from the second pressure accumulator bank before the hydrogen fuel tank is filled with hydrogen. The accumulator unit according to claim 1 or 9, which is filled in a hydrogen fuel tank.
Claim 11:
The accumulator unit according to any one of claims 1 to 10, wherein the hydrogen fuel tank is mounted on a vehicle.
Claim 12:
A hydrogen station comprising the accumulator unit according to any one of claims 1 to 11, and filling the hydrogen fuel tank with hydrogen stored in the accumulator unit.
Claim 13:
A compressor for boosting hydrogen;
The hydrogen station according to claim 12, wherein the pressure accumulator constituting the pressure accumulator unit can store hydrogen boosted by the compressor.
Claim 14:
A method of filling a hydrogen fuel tank with hydrogen from a pressure accumulator unit comprising a plurality of pressure accumulators each having a different volume,
A hydrogen filling method including filling the hydrogen fuel tank with the stored hydrogen in order from the largest volume accumulator in order of the volume.
Claim 15:
15. The hydrogen filling method according to claim 14, wherein the internal pressure of the pressure accumulator increases as the volume thereof decreases.
Claim 16:
The hydrogen filling method according to claim 14 or 15, wherein the hydrogen fuel tank is mounted on a vehicle.
Claim 17:
The hydrogen storage method according to any one of claims 14 to 16, wherein the pressure accumulator is capable of storing hydrogen boosted by a compressor.

DESCRIPTION OF SYMBOLS 1 Hydrogen station 2 Compressor 3 Accumulator unit 3a Inlet part 3b Outlet part 4 Vehicle 5 Hydrogen fuel tank 6 Dispenser 8 Control device 9 Connecting pipe 10 Unloading container 11 Connecting pipe 31 Low pressure bank 32 Medium pressure bank 33 High pressure bank 34 Rack 35 , 37, 38 Valve mechanism 36, 39 Check valve 40 Pressure detector 311, 321, 331 Accumulator

Claims (8)

A pressure accumulator unit capable of storing hydrogen filled in a hydrogen fuel tank,
One or more first pressure accumulators that are cylindrical pressure vessels capable of storing hydrogen are provided, and the hydrogen fuel tank can be filled with hydrogen when the internal pressure of the hydrogen fuel tank is low. Accumulator bank,
One or more second pressure accumulators, which are cylindrical pressure vessels capable of storing hydrogen, are provided, and hydrogen is supplied to the hydrogen fuel tank when the internal pressure of the hydrogen fuel tank is higher than the low pressure. A second accumulator bank that can be filled with
One or more third pressure accumulators that are cylindrical pressure vessels capable of storing hydrogen are provided, and the internal pressure of the hydrogen fuel tank is higher than the low pressure state and lower than the high pressure state. A third pressure accumulator bank capable of filling the hydrogen fuel tank with hydrogen,
With
Said third accumulator volume is smaller than the volume of said first accumulator, and much larger than the volume of the second accumulator,
The internal pressure of the third pressure accumulator is higher than the internal pressure of the first pressure accumulator and lower than the internal pressure of the second pressure accumulator,
When filling the hydrogen fuel tank from the pressure accumulator unit, first, the hydrogen from the first pressure accumulator bank is filled into the hydrogen fuel tank, and then the hydrogen from the third pressure accumulator bank is filled. The hydrogen fuel tank is filled, and then hydrogen from the second accumulator bank is filled into the hydrogen fuel tank,
The time when the hydrogen fuel tank is filled with hydrogen from the second pressure accumulator bank is shorter than the time when the hydrogen fuel tank is filled with hydrogen from the third pressure accumulator bank,
The accumulator unit, wherein a time during which the hydrogen fuel tank is filled with hydrogen from the third pressure accumulator bank is shorter than a time during which the hydrogen fuel tank is filled with hydrogen from the first pressure accumulator bank .   The length in the longitudinal direction of the third pressure accumulator is shorter than the length in the longitudinal direction of the first pressure accumulator and longer than the length in the longitudinal direction of the second pressure accumulator. The accumulator unit described. The pressure accumulator unit according to claim 1 or 2 , wherein the hydrogen fuel tank is mounted on a vehicle. A hydrogen station comprising the accumulator unit according to any one of claims 1 to 3 and filling the hydrogen fuel tank with hydrogen stored in the accumulator unit. A compressor for boosting hydrogen;
5. The hydrogen station according to claim 4 , wherein the pressure accumulator constituting the pressure accumulator unit can store hydrogen boosted by the compressor. A method of filling a hydrogen fuel tank with hydrogen from a pressure accumulator unit comprising a plurality of pressure accumulators each having a different volume,
Filling the hydrogen fuel tank with the stored hydrogen in order from the largest volume accumulator along the order of the volume,
The smaller the volume of the accumulator, the higher the internal pressure of the accumulator,
The hydrogen filling method of shortening the time for filling the hydrogen fuel tank from the pressure accumulator with a smaller volume of the pressure accumulator. The hydrogen filling method according to claim 6 , wherein the hydrogen fuel tank is mounted on a vehicle. The hydrogen filling method according to claim 6 or 7 , wherein the pressure accumulator can store hydrogen boosted by a compressor.

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