Hydrogen circulation device and hydrogen circulation method

Abstract

The hydrogen recycling unit recovers hydrogen from the generator via a hydrogen recovery pipeline and stores it in the first storage tank. The hydrogen stored in the first storage tank is compressed by a compressor and stored in the second storage tank. The hydrogen stored in the second storage tank is supplied to the generator via a hydrogen supply pipeline.

Description

Technical Field

[0001] This invention relates to a hydrogen recycling device and a hydrogen recycling method.

[0002] This application claims priority based on Japanese Patent Application No. 2023-208187, filed with the Japan Patent Office on December 11, 2023, the contents of which are incorporated herein by reference. Background Technology

[0003] The generator, driven by power in the power generation equipment, has a cooling structure that cools the device by exchanging heat with hydrogen supplied as a cooling medium, thereby suppressing heat generation during operation. Hydrogen can be supplied from external gas cylinders, but as the remaining amount in the cylinders decreases, they need to be replaced as needed to maintain cooling performance.

[0004] Patent Document 1 discloses an example of a rotating machine that can cool hydrogen as a cooling medium. In this document, it is argued that excess hydrogen can be recovered by a pump according to the load of the rotating machine and stored in a storage tank, and then supplied from the storage tank to the rotating equipment as needed, thereby suppressing the atmospheric emission of hydrogen.

[0005] Previous technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 60-74944 Summary of the Invention

[0008] The technical problem to be solved by the invention

[0009] In generators, as power generation increases, so does heat generation. Therefore, the pressure of hydrogen supplied to the generator for cooling is adjusted to ensure adequate cooling during rated operation when heat generation is at its maximum. However, when the generator operates at partial load, the hydrogen pressure within the generator becomes higher than necessary because heat generation is relatively low. This excessive hydrogen pressure is a major cause of increased hydrogen consumption due to increased hydrogen leakage from the generator to the outside, or decreased performance due to increased wind losses in the generator.

[0010] To address this issue, as in Patent Document 1 mentioned above, excess hydrogen from the generator can be recovered into a tank and then supplied back to the generator as needed. However, in Patent Document 1, since a pump is used to recover hydrogen from the generator, the recovery rate depends on the pump's performance. Therefore, to recover excess hydrogen responsively according to the generator's operating conditions, improved pump performance is required, which risks increasing equipment costs.

[0011] At least one embodiment of the present invention was made in view of the above circumstances, and its object is to provide a hydrogen recycling device and a hydrogen recycling method capable of recovering / supplying hydrogen according to the operating state of the generator and with good responsiveness.

[0012] means for solving technical problems

[0013] To address the aforementioned issues, at least one embodiment of the present invention relates to a hydrogen recycling device for recycling hydrogen used to cool a generator. The hydrogen recycling device comprises: a hydrogen recovery pipeline for recovering hydrogen from the generator; a first storage tank for storing the hydrogen recovered from the hydrogen recovery pipeline; a compressor for compressing the hydrogen stored in the first storage tank; a second storage tank for storing the hydrogen compressed by the compressor; and a hydrogen supply pipeline for supplying the hydrogen stored in the second storage tank to the generator.

[0014] To address the aforementioned issues, at least one embodiment of the present invention relates to a hydrogen recycling method for recycling hydrogen used to cool a generator. The hydrogen recycling method includes: a step of storing the hydrogen recovered from the generator in a first storage tank; a step of compressing the hydrogen stored in the first storage tank and storing it in a second storage tank; and a step of supplying the hydrogen stored in the second storage tank to the generator.

[0015] Invention Effects

[0016] According to at least one embodiment of the present invention, a hydrogen recycling device and a hydrogen recycling method are provided that can recover / supply hydrogen with good responsiveness based on the operating status of the generator. Attached Figure Description

[0017] Figure 1 This is a schematic diagram showing the structure of a power generation device 1 according to one embodiment.

[0018] Figure 2 It means Figure 1 A flowchart of the operation method of the hydrogen cycle unit during normal operation of the power generation equipment 1.

[0019] Figure 3 It means and Figure 2 The structure diagram of the action state corresponding to step S3.

[0020] Figure 4 It means and Figure 2 The structure diagram of the action state corresponding to step S4.

[0021] Figure 5 It means and Figure 2 The structure diagram of the action state corresponding to step S8.

[0022] Figure 6 It means and Figure 2 The structure diagram of the action state corresponding to step S11.

[0023] Figure 7 It means Figure 1 A structural diagram of the operating state in another operating method of the hydrogen cycle unit.

[0024] Figure 8 It means Figure 1 A structural diagram of the operating state in another operating method of the hydrogen cycle unit. Detailed Implementation

[0025] Hereinafter, several embodiments of the present invention will be described with reference to the accompanying drawings. However, the structures described or illustrated as embodiments are not intended to limit the scope of the present invention, but are merely illustrative examples.

[0026] First, refer to Figure 1 The following describes a power generation device 1 that includes a hydrogen cycle device according to at least one embodiment of the present invention. Figure 1 This is a schematic diagram showing the structure of a power generation device 1 according to one embodiment.

[0027] The power generation equipment 1 includes a gas turbine 2 and a generator 4 that is connected to the gas turbine 2 and is able to generate electricity using the power output from the gas turbine 2.

[0028] The gas turbine 2 includes a compressor 6, a combustor 8, and a turbine 10. The compressor 6 generates compressed air by compressing combustion air A (e.g., outside air). In the combustor 8, hydrogen H2 is supplied as fuel F from a fuel supply system 12. The fuel supply system 12 is capable of supplying fuel F (hydrogen H2) to the combustor 8 via a fuel supply line 16 connected to a hydrogen supply device 14. The hydrogen supply device 14 is a device for supplying hydrogen H2 to the gas turbine 2, such as a hydrogen energy zone device including hydrogen cylinders or hydrogen production equipment.

[0029] The burner 8 generates combustion gases by mixing and burning fuel F supplied from the fuel supply system 12 with compressed air from the compressor 6. The combustion gases drive the turbine 10, and the completed combustion gases are discharged to the outside as exhaust gas Gex through an exhaust pipe not shown.

[0030] The generator 4 has a generator rotor 20 integrally formed with the gas turbine rotor 18 of the gas turbine 2. The generator rotor 20 is rotatably supported on both sides relative to the generator housing 22 by a pair of bearings 24. Furthermore, a sealing member 26 is provided inside the pair of bearings 24 to prevent oil leakage encapsulated inside the generator housing 22.

[0031] The generator 4 has a cooling structure that uses hydrogen (H2) as the cooling medium. The cooling structure provides cooling performance to the flow path located inside the generator housing 22 through heat exchange with the hydrogen (H2) sealed at a predetermined pressure P. Figure 1 The diagram shows the operating state of the power generation unit 1 under normal operating conditions. A portion of the hydrogen (H2) supplied as fuel from the hydrogen supply unit 14 to the gas turbine 2 is pre-sealed into the generator 4 via a fuel branch line 33 branching from the fuel supply line 16. Figure 1 In this configuration, hydrogen (H2) is supplied to the generator 4 via fuel branch line 33, and therefore fuel branch line 33 is shown as being shut off by closing valve V5. Thus, by configuring hydrogen (H2) as part of the fuel supplied to the gas turbine 2 to be supplied as a cooling medium to the cooling structure, there is no need to provide an additional supply source for supplying hydrogen (H2) as a cooling medium outside of the hydrogen supply equipment 14, effectively reducing equipment costs.

[0032] Furthermore, as described later, through the recovery or supply of hydrogen H2 based on the hydrogen circulation device 30, the pressure P of the hydrogen H2 sealed in the generator 4 is controlled within an allowable range for maintaining the appropriate operating condition of the generator 4. This allowable range is defined by a first reference value Pref1 as the upper limit and a second reference value Pref2 as the lower limit.

[0033] In addition, the pressure P of hydrogen H2 in generator 4 can be detected by pressure sensor 29 installed in generator housing 22.

[0034] The hydrogen circulation device 30 is a device for circulating hydrogen H2 supplied to the generator 4 as a cooling medium, and it includes a first storage tank 32, a second storage tank 34 and a compressor 36.

[0035] If the hydrogen (H2) pressure P in generator 4 is greater than the first reference value Pref1, the excess hydrogen (H2) in generator 4 can be recovered into the first storage tank 32. (See reference...) Figure 3 As will be described later, the recovery of hydrogen (H2) is carried out by opening valves V6 and V7 on the hydrogen recovery pipelines (pipelines 40 and 41) connecting generator 4 and first storage tank 32. In this way, excess hydrogen (H2) in generator 4 is recovered into first storage tank 32 via the hydrogen recovery pipeline, thereby eliminating the need for atmospheric emission.

[0036] Furthermore, the first storage tank 32 is set to a pressure sufficiently low (e.g., atmospheric pressure) compared to the pressure P of hydrogen H2 in the generator 4. Therefore, through the pressure difference between the generator 4 and the first storage tank 32, the first storage tank 32 can rapidly recover hydrogen H2 from the generator 4. Thus, in the event of an excess of hydrogen H2 in the generator 4 depending on its operating state, the excess hydrogen H2 can be recovered from the generator 4 to the first storage tank 32 with good responsiveness.

[0037] The hydrogen (H2) stored in the first storage tank 32 can be compressed by the compressor 36. (See reference...) Figure 4 As will be described later, compressor 36 is connected to first storage tank 32 via lines 41 and 42, and compresses hydrogen H2 in first storage tank 32 by opening valves V7 and V8 on these lines. Hydrogen H2 compressed by compressor 36 is stored in second storage tank 34 via lines 43, 44, and 45.

[0038] As needed, the hydrogen (H2) stored in the second storage tank can be supplied to the generator 4 via hydrogen supply pipelines (pipelines 45, 42, 41, 40). Therefore, if the pressure of the hydrogen (H2) in the generator 4 is lower than the second reference value Pref2 and exceeds the allowable range, as per reference... Figure 5 As will be described later, hydrogen H2 is supplied from the second storage tank 34 to the generator 4 by opening the valves V8 and V10 on the hydrogen supply line, thus making up for the shortfall without the need for additional hydrogen H2 from the outside.

[0039] The hydrogen recycling device 30 may also include a hydrogen supply source 50 for supplementing the supply of hydrogen (H2) to the generator 4. The hydrogen supply source 50 is a removable hydrogen cylinder and is connected to the fuel branch line 33 via a pipe 46. As described above, in the power generation unit 1, by including the hydrogen recycling device 30, in the event of an excess or deficiency of hydrogen (H2) in the generator 4, the problem can be addressed by recovering or supplying hydrogen between the generator 4 and the generator. However, even so, if the required hydrogen (H2) in the generator 4 is still insufficient, as referenced... Figure 6 As will be described later, by opening valves V5 and V11, additional hydrogen (H2) can be supplied from hydrogen supply source 50 to compensate.

[0040] The power generation equipment 1 includes a control device 100 for controlling the aforementioned structures. The control device 100 comprises, for example, a CPU (Central Processing Unit), RAM (Random Access Memory), ROM (Read Only Memory), and a computer-readable storage medium. Furthermore, a series of processes for implementing various functions, as an example, are implemented by storing the program in the storage medium, having the CPU read the program into RAM, and performing information processing and arithmetic operations to achieve various functions. Alternatively, the program may be pre-installed in ROM or other storage media, provided in a state stored in a computer-readable storage medium, or distributed via wired or wireless communication units. The computer-readable storage medium includes disks, optical disks, CD-ROMs, DVD-ROMs, semiconductor memories, etc.

[0041] In addition, in each figure, the control device 100 is connected to each structure of the power generation equipment 1 that is the object of control via signal lines, but the connection lines are omitted for the sake of simplifying the illustration.

[0042] Next, the operation method of the hydrogen circulation device 30 during normal operation of the power generation equipment 1 having the above structure will be described. Figure 2 It means Figure 1 A flowchart illustrating the operation method of the hydrogen cycle unit during normal operation of power generation equipment 1. Figure 3 It means and Figure 2 The structure diagram of the action state corresponding to step S3. Figure 4 It means and Figure 2 The structure diagram of the action state corresponding to step S4. Figure 5 It means and Figure 2 The structure diagram of the action state corresponding to step S8. Figure 6 It means and Figure 2 The structure diagram of the action state corresponding to step S11.

[0043] In addition, the following description illustrates the case where the hydrogen recycling device 30 is operated (controlled) automatically by the control device 100, but these actions can also be performed manually by personnel.

[0044] First, the control device 100 acquires the pressure P of hydrogen H2 in the generator 4 detected by the pressure sensor 29 (step S1), and determines whether it exceeds the upper limit of the allowable range, i.e., the first reference value Pref1 (step S2). If it is determined that the pressure P is higher than the first reference value Pref1 (step S2: "Yes"), the control device 100 controls the hydrogen recycling device 30 to recover excess hydrogen H2 from the generator 4 (step S3). Figure 3 As shown, in step S3, the control device 100 controls the hydrogen circulation device 30 by opening valves V6 and V7, so that excess hydrogen H2 is recovered from the generator 4 to the first storage tank 32 via hydrogen recovery pipelines (pipelines 40 and 41 shown in emphasis).

[0045] Then, the hydrogen (H2) recovered in the first storage tank 32 is compressed by the compressor 36 and stored in the second storage tank 34 (step S4). Figure 4 As shown, in step S4, by using the control device 100 to open valves V7 and V8, hydrogen H2 from the first storage tank 32 is introduced into the second storage tank 34 through the compressor 36.

[0046] Then, the control device 100 again acquires the pressure P of the hydrogen H2 in the generator 4 detected by the pressure sensor 29 (step S5), and again determines whether the pressure P is higher than the first reference value Pref1 (step S5). As a result, if it is determined that the pressure P is lower than the first reference value Pref1 (step S5: "No"), the process returns to step S1, and the series of processes are repeated. On the other hand, if it is determined that the pressure P is still higher than the first reference value Pref1 (step S6: "Yes"), the process returns to step S3, and the hydrogen H2 from the generator 4 is recovered again in the first storage tank 32. In this case, the hydrogen consumption in the generator 4 can be reduced.

[0047] On the other hand, if the pressure P is determined to be below the upper limit of the allowable range, i.e., the first reference value Pref1 (step S2: "No"), the control device 100 determines whether the pressure P is below the lower limit of the allowable range, i.e., the second reference value Pref2 (step S7). If the pressure P is determined to be below the second reference value Pref2 (step S7: "Yes"), insufficient hydrogen H2 is supplied to the generator 4 through the hydrogen circulation device 30 (step S8). Figure 5 As shown, in step S8, the control device 100 controls the hydrogen circulation device 30 by opening valves V8 and V10 to supply insufficient hydrogen H2 from the second storage tank 34 to the generator 4 via hydrogen supply lines (emphasized lines 45, 44, 40).

[0048] Then, the control device 100 again acquires the pressure P of hydrogen H2 in the generator 4 detected by the pressure sensor 29 (step S9), and again determines whether the pressure P is lower than the second reference value Pref2 (step S10). As a result, if it is determined that the pressure P is higher than the second reference value Pref2 (step S10: "No"), the process returns to step S1, and the series of processes is repeated. On the other hand, if it is determined that the pressure P is still lower than the second reference value Pref2 (step S10: "Yes"), the insufficient amount of hydrogen H2 is supplied from the hydrogen supply source 50 (step S11). Figure 6 As shown, in step S11, the control device 100 supplies hydrogen H2 from the hydrogen supply source 50 to the generator 4 via pipelines 46 and 40 by opening valves V5 and V11. Thus, when the hydrogen H2 pre-recovered by the hydrogen recycling device 30 is insufficient to compensate for the insufficient amount in the generator 4, supplementary supply from the hydrogen supply source 50 can effectively suppress hydrogen consumption based on the hydrogen supply source 50.

[0049] Next, as another operating method of the hydrogen recycling device 30, the case in which the hydrogen H2 supplied to the generator 4 is replaced with inactive gases such as carbon dioxide CO2 or nitrogen N2 when the power generation equipment 1 is stopped will be described. Figure 7 and Figure 8 It means Figure 1 A structural diagram of the operating state of another operating method of the hydrogen recycling unit 30.

[0050] When power generation equipment 1 stops, fuel supply to the combustor 8 of gas turbine 2 is stopped by closing valves V1 and V4. In this state, as... Figure 7 As shown, by opening valves V6 and V7, the hydrogen H2 remaining in generator 4 is recovered from generator 4 into the first storage tank 32. Furthermore, by opening valves V8 and V9, any remaining hydrogen H2 that cannot be fully recovered in the first storage tank 32 is recovered into the second storage tank 34. As described above, the second storage tank 34 stores hydrogen H2 compressed by compressor 36, maintaining a higher pressure than the first storage tank 32. By preferentially supplying the hydrogen H2 recovered from the first and second storage tanks 34 to generator 4, it is possible to temporarily operate without accepting hydrogen H2 from hydrogen supply equipment 14, suppressing the amount of hydrogen H2 supplied, thereby improving equipment efficiency.

[0051] Thus, as Figure 8As shown, if hydrogen recovery from the first storage tank 32 and the second storage tank 34 begins, a displacement inert gas (such as carbon dioxide CO2 or nitrogen N2) is supplied from the inert gas supply source 60 to the generator 4. At this time, the control device 100 performs displacement by supplying inert gas to the generator 4 by opening the valve V12 located in the inert gas supply pipeline 62 connecting the inert gas supply source 60 and the generator 4.

[0052] As explained above, according to the embodiments described, in the event of excess hydrogen (H2) for cooling in the generator 4, the excess hydrogen (H2) is recovered to the first storage tank 32 via a hydrogen recovery pipeline. The first storage tank 32 is at a lower pressure than the generator 4, thereby enabling rapid recovery of excess hydrogen (H2) using the pressure difference. The hydrogen recovered to the first storage tank 32 is pressurized by the compressor 36 and then stored in the second storage tank 34. Therefore, hydrogen (H2) with increased pressure can be supplied to the generator 4 from the second storage tank 34 as needed.

[0053] Furthermore, the structural elements in the above embodiments can be appropriately replaced with well-known structural elements without departing from the spirit of the present invention, and the above embodiments can be appropriately combined.

[0054] The contents described in the above embodiments are as follows.

[0055] (1) A hydrogen recycling device according to one method is for recycling hydrogen used to cool a generator, the hydrogen recycling device comprising: a hydrogen recovery pipeline for recovering the hydrogen from the generator; a first storage tank for storing the hydrogen recovered from the hydrogen recovery pipeline; a compressor for compressing the hydrogen stored in the first storage tank; a second storage tank for storing the hydrogen compressed by the compressor; and a hydrogen supply pipeline for supplying the hydrogen stored in the second storage tank to the generator.

[0056] According to the method described in (1) above, in the event of excess hydrogen for cooling in the generator, the excess hydrogen is recovered to the first storage tank via a hydrogen recovery pipeline. The first storage tank is in a state where the pressure of hydrogen in the generator is lower, thereby enabling the rapid recovery of excess hydrogen using the pressure difference. The hydrogen recovered to the first storage tank is pressurized by a compressor and then stored in the second storage tank. Thus, hydrogen with increased pressure can be supplied to the generator from the second storage tank as needed.

[0057] (2) In another manner, in the manner described in (1) above, the hydrogen is recovered from the generator to the first storage tank via the hydrogen recovery pipeline when the pressure of the hydrogen in the generator is above a predetermined reference value.

[0058] According to the method described in (2) above, when the hydrogen pressure in the generator is above the reference value, excess hydrogen is recovered from the generator to the first storage tank. Thus, by preventing the hydrogen pressure in the generator from becoming too high, it is possible to effectively prevent an increase in hydrogen leakage or a decrease in efficiency due to increased wind loss in the generator.

[0059] (3) In another manner, in the manner described in (1) or (2) above, the hydrogen is supplied from the second storage tank to the generator via the hydrogen supply line when the pressure of the hydrogen in the generator is less than a preset reference value.

[0060] According to the method described in (3) above, when the hydrogen pressure in the generator is less than the reference value, hydrogen is supplied from the second storage tank to the generator where hydrogen is insufficient. Thus, when the hydrogen pressure in the generator is insufficient, it can be effectively compensated by the supply of hydrogen from the second storage tank.

[0061] (4) In another manner, in any of the manners (1) to (3) above,

[0062] The hydrogen recovery pipeline includes a hydrogen recovery branch pipeline, which branches out from the generator to the second storage tank without passing through the first storage tank.

[0063] According to the method described in (4) above, the hydrogen present in the generator can be recovered to the second storage tank via the hydrogen recovery branch line without going through the first storage tank. Thus, for example, when recovering hydrogen from the generator during a relatively long period of generator shutdown or maintenance, the hydrogen present in the generator can be properly recovered via the hydrogen recovery branch line.

[0064] (5) In another embodiment, in any of the embodiments (1) to (4) above, a hydrogen supply source is provided that is connected to the hydrogen supply pipeline.

[0065] According to the method described in (5) above, hydrogen can be supplied to the generator from a hydrogen supply source connected to the hydrogen supply pipeline. Therefore, if the supply of hydrogen recovered from the first or second storage tank is insufficient to replenish the hydrogen required by the generator, the insufficient hydrogen can be supplemented from the hydrogen supply source. In this case, since the hydrogen required by the generator is replenished by recovering hydrogen from the first or second storage tank to the extent possible, the amount of hydrogen supplied from the hydrogen supply source can be saved.

[0066] (6) In another embodiment, in any of the embodiments (1) to (5) above, the hydrogen supply line is connected to a fuel supply line for supplying hydrogen as fuel from the hydrogen supply equipment to a gas turbine connected to the generator.

[0067] According to the above (6), in the generator connected to the gas turbine which is supplied with hydrogen as fuel, hydrogen used to cool the generator can be supplied to the gas turbine from the fuel supply line.

[0068] (7) A hydrogen recycling method according to one aspect is used to recycle hydrogen used to cool a generator, the hydrogen recycling method comprising: storing the hydrogen recovered from the generator in a first storage tank; compressing the hydrogen stored in the first storage tank and storing it in a second storage tank; and supplying the hydrogen stored in the second storage tank to the generator.

[0069] According to the method described in (7) above, in the event of excess hydrogen for cooling in the generator, the excess hydrogen is recovered to the first storage tank via a hydrogen recovery pipeline. The first storage tank is in a state where the pressure of hydrogen in the generator is lower, thereby enabling the rapid recovery of excess hydrogen using the pressure difference. The hydrogen recovered to the first storage tank is pressurized by a compressor and then stored in the second storage tank. Thus, hydrogen with increased pressure can be supplied to the generator from the second storage tank as needed.

[0070] Symbol Explanation

[0071] 1-Power generation equipment, 2-Gas turbine, 4-Generator, 6-Compressor, 8-Burner, 10-Turbine, 12-Fuel supply system, 14-Hydrogen supply equipment, 16-Fuel supply pipeline, 18-Gas turbine rotor, 20-Generator rotor, 22-Generator housing, 24-Bearing, 26-Sealing components, 29-Pressure sensor, 30-Hydrogen circulation device, 32-First storage tank, 34-Second storage tank, 36-Compressor, 60-Inactive gas supply source, 62-Inactive gas supply pipeline, 100-Control device.

Claims

1. A hydrogen recycling device for recycling hydrogen used to cool a generator, said hydrogen recycling device comprising: Hydrogen recovery pipeline for recovering hydrogen from the generator; The first storage tank is used to store the hydrogen recovered from the hydrogen recovery pipeline; A compressor for compressing the hydrogen stored in the first storage tank; The second storage tank is used to store the hydrogen compressed by the compressor; and A hydrogen supply pipeline is used to supply the hydrogen stored in the second storage tank to the generator.

2. The hydrogen recycling device according to claim 1, wherein, The system is configured such that, when the pressure of the hydrogen in the generator is above a preset reference value, the hydrogen is recovered from the generator to the first storage tank via the hydrogen recovery pipeline.

3. The hydrogen recycling device according to claim 1 or 2, wherein, The system is configured such that, when the pressure of the hydrogen in the generator is less than a preset reference value, the hydrogen is supplied from the second storage tank to the generator via the hydrogen supply pipeline.

4. The hydrogen recycling device according to claim 1 or 2, wherein, The hydrogen recovery pipeline includes a hydrogen recovery branch pipeline, which branches out from the generator to the second storage tank without passing through the first storage tank.

5. The hydrogen recycling apparatus according to claim 1 or 2, wherein it comprises a hydrogen supply source connected to the hydrogen supply pipeline.

6. The hydrogen recycling device according to claim 1 or 2, wherein, The hydrogen supply line is connected to a fuel supply line, which supplies hydrogen as fuel from the hydrogen supply equipment to the gas turbine connected to the generator.

7. A hydrogen recycling method for recycling hydrogen used to cool a generator, said hydrogen recycling method comprising: The process of storing the hydrogen recovered from the generator in the first storage tank; The process of compressing the hydrogen stored in the first storage tank and storing it in the second storage tank; and The process of supplying the hydrogen stored in the second storage tank to the generator.

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