Operation method for hydrogen supply apparatus, and hydrogen supply apparatus

Abstract

To reduce hydrogen that may remain in a vent stack when performing nitrogen replacement of a hydrogen supply line.SOLUTION: A hydrogen supply apparatus comprises a hydrogen supply line for supplying hydrogen from a hydrogen supply source to a gas turbine, a vent stack connected to the hydrogen supply line and capable of releasing hydrogen from the hydrogen supply line to the atmosphere, and a nitrogen supply line connected to the hydrogen supply line for supplying nitrogen to the vent stack. In an operation method for this apparatus, the supply of hydrogen from the hydrogen supply source to the hydrogen supply line is stopped, and nitrogen is supplied from the nitrogen supply line to the hydrogen supply line, thereby releasing hydrogen from the vent stack. Thereafter, nitrogen is supplied from the nitrogen supply line to the vent stack.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a method for operating a hydrogen supply facility and a hydrogen supply facility.

Background Art

[0002] A gas turbine that obtains power by driving a turbine using combustion gas generated by combustion of fuel is known. In recent years, in addition to / replacing hydrocarbon gases such as conventional natural gas, the utilization of hydrogen with a high combustion rate has been studied as a fuel for gas turbines. The hydrogen used in a gas turbine is supplied by a hydrogen supply facility installed in the gas turbine.

[0003] In a hydrogen supply facility, hydrogen is supplied to a gas turbine via a hydrogen supply line connected to a hydrogen storage tank in which hydrogen is stored in advance or a hydrogen trailer connected to supply hydrogen from the outside for transportation and replenishment. Usually, the hydrogen supply line is filled with hydrogen, but when the hydrogen supply facility is stopped for a relatively long period or maintenance is performed, from the viewpoint of safety, it is required to discharge the hydrogen filled in the hydrogen supply line to the outside. At this time, in order to prevent highly flammable hydrogen from mixing with oxygen, hydrogen is released to the outside from a vent stack provided in the hydrogen supply line, and once, it is necessary to replace the hydrogen supply line with nitrogen, which is an inert gas.

[0004] For example, Patent Document 1 discloses a configuration having a vent stack for discharging hydrogen to the outside when replacing the hydrogen supply line with nitrogen, although the object to which hydrogen is supplied is a fuel cell vehicle instead of a gas turbine.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Here, since hydrogen is a gas with a relatively low specific gravity, the vent stack provided in the hydrogen supply line is designed to have an opening at its upper part for discharging hydrogen to the outside. In this way, hydrogen convection is less likely to occur in the vent stack, and smooth external discharge of hydrogen is expected. However, according to the verification by the inventor of the present invention, it has been found that even in a vent stack having such a design, when an actual operation test is carried out, a certain amount of hydrogen may remain in the vent stack.

[0007] At least one embodiment of the present disclosure has been made in view of the above circumstances, and an object thereof is to provide an operation method of a hydrogen supply facility capable of reducing hydrogen that may remain in a vent stack when replacing the hydrogen in the hydrogen supply line with nitrogen, and a hydrogen supply facility.

Means for Solving the Problems

[0008] The operation method of a hydrogen supply facility according to at least one embodiment of the present disclosure is, in order to solve the above problems, a hydrogen supply line for supplying hydrogen from a hydrogen supply source to a gas turbine, a vent stack connected to the hydrogen supply line and capable of discharging the hydrogen from the hydrogen supply line to the atmosphere, a nitrogen supply line connected to the hydrogen supply line and for supplying nitrogen to the vent stack, and is an operation method of a hydrogen supply facility comprising: a hydrogen supply stop step of stopping the supply of the hydrogen from the hydrogen supply source to the hydrogen supply line, a hydrogen discharge step of discharging the hydrogen from the vent stack by supplying the nitrogen from the nitrogen supply line to the hydrogen supply line, a nitrogen supply step of supplying the nitrogen from the nitrogen supply line to the vent stack after the hydrogen discharge step, and comprising.

[0009] In order to solve the above problems, a hydrogen supply facility according to at least one embodiment of the present disclosure includes a hydrogen supply line for supplying hydrogen from a hydrogen supply source to a gas turbine, a vent stack connected to the hydrogen supply line and capable of discharging the hydrogen from the hydrogen supply line to the atmosphere, a nitrogen supply line connected to the hydrogen supply line and for supplying nitrogen to the vent stack, and the nitrogen supply line is connected so as to be able to supply the nitrogen to a side farther from the hydrogen supply source than a first valve provided between the hydrogen supply source and the vent stack in the hydrogen supply line.

Advantages of the Invention

[0010] According to at least one embodiment of the present disclosure, it is possible to provide an operation method of a hydrogen supply facility capable of reducing hydrogen that may remain in a vent stack when the hydrogen supply line is purged with nitrogen, and a hydrogen supply facility.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3A

Figure 3B1

Figure 3B2

Figure 3C

Figure 4

Figure 5A

Figure 5B

Figure 6

Embodiments for Carrying Out the Invention

[0012] Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the configurations described as embodiments or shown in the drawings are not intended to limit the scope of the present disclosure, but are merely illustrative examples.

[0013] FIG. 1 is a schematic configuration diagram of a hydrogen supply facility 1A according to an embodiment. The hydrogen supply facility 1A is a facility for supplying hydrogen H2 as fuel to the fuel system of the gas turbine 2.

[0014] The hydrogen supply facility 1A includes a hydrogen supply source 6 capable of supplying hydrogen H2. The hydrogen supply source 6 can use any configuration capable of supplying hydrogen H2, and may be a tank (hydrogen storage tank) in which hydrogen H2 is stored in advance, a hydrogen production facility capable of producing hydrogen H2, or a moving body such as a vehicle (hydrogen trailer) equipped with a portable tank in which hydrogen H2 is stored in advance. Further, the hydrogen supply source 6 may be configured such that hydrogen H2 can be supplied from at least one of a plurality of hydrogen supply sources, such as a hydrogen storage tank and a hydrogen trailer, by combining the plurality of hydrogen supply sources.

[0015] The hydrogen supply source 6 is connected to the fuel system of the gas turbine 2 by a hydrogen supply line 3. Valves V1 and V2 are provided in the hydrogen supply line 3. The valve V1 is installed near the outlet of the hydrogen supply source 6 in the hydrogen supply line 3, and the valve V2 is installed downstream of the valve V1 (near the gas turbine 2). In FIG. 1, the operating state during normal operation of the gas turbine 1 is shown, and both the valves V1 and V2 are in the open state, so that hydrogen H2 from the hydrogen supply source 6 is supplied to the fuel system of the gas turbine 2 via the fuel supply line 3.

[0016] From between valves V1 and V2 in the hydrogen supply line 3, a vent line 14 branches off. One end of the vent line 14 is connected to a branch point 16 on the hydrogen supply line 3, and the other end is connected to a vent stack 18. A valve V3 is provided in the vent line 14. By opening the valve V3, the atmosphere in the hydrogen supply line 3 can be discharged to the outside from the vent stack 18 via the vent line 14.

[0017] In addition, a hydrogen detector 18b for detecting hydrogen H2 in the vent stack 18 is provided in the vent stack 18. By means of this hydrogen detector 18b, it is possible to detect the hydrogen H2 discharged from the vent stack 18 to the outside.

[0018] In the hydrogen supply facility 1A having the above configuration, usually, the hydrogen supply line 3 is filled with hydrogen H2. However, when the hydrogen supply facility 1A is stopped for a relatively long period or maintenance is carried out, from the viewpoint of safety, it is required to discharge the hydrogen H2 filled in the hydrogen supply line 3 to the outside from the vent stack 18. At this time, in order to prevent the highly flammable hydrogen H2 from mixing with oxygen O2, the hydrogen supply line 3 is once replaced with nitrogen N2, which is an inert gas.

[0019] The hydrogen supply facility 1A includes a nitrogen supply line 20 for supplying nitrogen N2 used for such nitrogen replacement. A nitrogen supply source 22 is connected to the nitrogen supply line 20. By opening the valves V4 and V5 provided in the nitrogen supply line 20, nitrogen N2 can be supplied to the hydrogen supply line 3. This nitrogen supply line 20 is connected between valves V1 and V2 in the hydrogen supply line 3.

[0020] Next, an operation method of the hydrogen supply facility 1A having the above configuration will be described. Here, an operation method for replacing hydrogen H2 remaining in the hydrogen supply line 3 with nitrogen N2 when the hydrogen supply facility 1A is stopped for a relatively long period or maintenance is performed will be described. FIG. 2 is a flowchart showing the operation method of the hydrogen supply facility 1A of FIG. 1, FIG. 3A is a configuration diagram showing the operating state of the hydrogen supply facility 1A corresponding to step S1 of FIG. 2, FIGS. 3B1 and 3B2 are configuration diagrams showing the operating state of the hydrogen supply facility 1A corresponding to step S2 of FIG. 2, and FIG. 3C is a configuration diagram showing the operating state of the hydrogen supply facility 1A corresponding to step S4 of FIG. 2.

[0021] In the initial state of this operation method, the hydrogen supply facility 1A is in the normal operation state. In the normal operation state, as shown in FIG. 1, valves V1 and V2 are in the open state (the other valves V3 to V5 are in the closed state), and hydrogen H2 is supplied from the hydrogen supply source 6 to the fuel system of the gas turbine 2 via the hydrogen supply line 3. In this operation method, first, the supply of hydrogen H2 from the hydrogen supply source 6 to the hydrogen supply line 3 is stopped (step S1: hydrogen supply stop step). Specifically, as shown in FIG. 3A, by operating to switch the valves V1 and V2, which were in the open state, to the closed state, the supply of hydrogen H2 from the hydrogen supply source 6 is stopped.

[0022] Subsequently, nitrogen N2 is supplied from the nitrogen supply line 20 to the hydrogen supply line 3 so that the hydrogen concentration in the hydrogen supply line 3 becomes equal to or lower than the first reference value, and the atmosphere in the hydrogen supply line 3 is discharged to the outside from the vent stack 18 (step S2: hydrogen discharge step). In step S2, first, as shown in FIG. 3B1, the valves V4 and V5 that were in the closed state are operated to be switched to the open state. As a result, nitrogen N2 is supplied from the nitrogen supply line 20 to the closed range including the portion between the valve V1 and the valve V2 in the hydrogen supply line 3 and the portion between the branch point 16 and the valve V3 in the vent line 14. In this range, the nitrogen N2 supplied from the nitrogen supply line 20 and the hydrogen H2 originally filled in this range are mixed, and the atmosphere becomes a mixed gas Gc with a reduced hydrogen concentration. Subsequently, as shown in FIG. 3B2, the valve V4 that was opened in FIG. 3B1 is switched back to the closed state, and the valve V3 that was in the closed state is operated to be switched to the open state. As a result, the mixed gas Gm in this range is discharged to the outside from the vent stack 18 via the vent line 14.

[0023] In step S2, a process including such supply of nitrogen N2 and discharge of the mixed gas Gc is repeatedly performed. By repeating this process, the hydrogen concentration of the mixed gas Gc discharged from the vent stack 18 gradually decreases. The repetition of this process is performed until the hydrogen concentration of the mixed gas Gc becomes equal to or lower than a preset first reference value. Note that the hydrogen concentration of the mixed gas Gc can be detected, for example, based on the mixed gas Gc sampled from an arbitrary line.

[0024] Here, the vent stack 18 has, at its upper part, an opening 18a through which the mixed gas Gc supplied via the vent line 14 can be discharged to the outside. Since the mixed gas Gc contains hydrogen with a relatively low specific gravity, by providing the opening 18a at the upper part of the vent stack 18, in the vent stack 18, hydrogen convection is less likely to occur inside, and it is expected to be smoothly discharged to the outside. However, according to the verification by the inventor, even in the vent stack 18 having such a design, when an actual operation test is carried out, it has been found that a certain amount of hydrogen H2 may remain in the vent stack 18. Such a problem can be preferably solved by carrying out the next nitrogen supply step.

[0025] Subsequently, nitrogen N2 is supplied from the nitrogen supply line 20 to the vent stack 18 (step S3: nitrogen supply step). Specifically, as shown in FIG. 3C, by operating to switch the valve V4 in the closed state to the open state, the nitrogen N2 from the nitrogen supply source 22 is supplied to the vent stack 18 via the nitrogen supply line 20, the hydrogen supply line 3, and the vent line 14. In this way, after the hydrogen concentration of the mixed gas Gc discharged from the vent stack 18 in the hydrogen discharge step (step S2) is reduced to the first reference value or less, by additionally supplying nitrogen N2 to the vent stack 18, the hydrogen H2 remaining in the vent stack 18 can be preferably reduced.

[0026] Subsequently, hydrogen detection by the hydrogen detector 18b provided in the vent stack 18 is started (step S5). As described above, the hydrogen detector 18b can detect hydrogen H2 in the vent stack 18. In the present embodiment, the hydrogen detector 18b has a hydrogen detection function of determining whether or not the hydrogen concentration specified by detecting hydrogen H2 in the vent stack 18 is equal to or higher than a preset second reference value. This hydrogen detection function of the hydrogen detector 18b samples the atmosphere in the vent stack 18 and, when the hydrogen concentration is equal to or higher than the second reference value, is mounted on the vent stack 18 as a function for detecting, for example, leakage hydrogen from the upstream side of the vent stack 18. Such a hydrogen detection function of the hydrogen detector 18b is made effective after the hydrogen H2 remaining in the vent stack 18 is suitably reduced by performing the nitrogen supply step (step S4), thereby preventing false detection due to the hydrogen remaining in the vent stack 18.

[0027] Subsequently, with reference to FIG. 4, the hydrogen supply facility 1B according to another embodiment will be described. FIG. 4 is a schematic configuration of the hydrogen supply facility 1B according to another embodiment.

[0028] In the hydrogen supply facility 1B, the nitrogen supply line 20 has a nitrogen branch supply line 26 that is connected to the vent stack 18 without passing through the hydrogen supply line 3. Specifically, the nitrogen branch supply line 26 is configured to be connected to the vent stack 18 from a branch point 25 provided between the valves V4 and V5 in the nitrogen supply line 20.

[0029] In this hydrogen supply facility 1B, in the above-described nitrogen supply step (step S5), by operating so as to switch the valve V6 provided on the nitrogen branch supply line 26 to the open state, nitrogen N2 from the nitrogen supply source 22 is directly supplied to the vent stack 18 via the nitrogen branch supply line 26. By directly supplying nitrogen N2 to the vent stack 18 via the nitrogen branch supply line 26 in the nitrogen supply step (step S5) in this way, the remaining hydrogen in the vent stack 18 can be suitably reduced while suppressing the consumption amount of nitrogen N2.

[0030] Figures 5A and 5B are a modified example of FIG. 4. In this modified example, the supply amount of nitrogen N2 in the nitrogen supply step (step S4) is configured to be larger than that in the hydrogen release step (step S2). As a configuration for realizing this, in this modified example, the nitrogen branch supply line 26 includes a main line 26a and a sub-line 26b provided in parallel to the main line 26a. Valves V6 and V7 are provided in the main line 26a and the sub-line 26b, respectively.

[0031] In the hydrogen release step (step S2), as shown in FIG. 5A, a switching operation is performed so that the valve V6 is in an open state and the valve V7 is in a closed state, whereby the supply of nitrogen N2 through the nitrogen branch supply line 26 is performed at a relatively small flow rate only through the main line 26a. On the other hand, in the nitrogen supply step (step S4), as shown in FIG. 5B, a switching operation is performed so that the valves V6 and V7 are in an open state, whereby the supply of nitrogen N2 through the nitrogen branch supply line 26 is performed at a larger flow rate through both the main line 26a and the sub-line 26b.

[0032] In addition, in the nitrogen supply step (step S4), for example, by making the opening degree of the valve V7 larger than the opening degree of the valve V6, the amount of nitrogen N2 supplied to the sub-line 26b may be made larger than the amount supplied to the main line 26a. In this case, in the nitrogen supply step (step S4), the amount of nitrogen N2 supplied to the vent stack 18 can be made larger than the supply amount of nitrogen N2 in the hydrogen release step (step S2).

[0033] In another embodiment, a control valve may be provided in the nitrogen supply line 20 (or the nitrogen branch supply line 26), and in the nitrogen supply step (step S4), the opening degree of the control valve may be made larger than that during the hydrogen release step (step S2). In this embodiment, in the nitrogen supply step (step S4), a larger amount of nitrogen N2 can be supplied to the vent stack 18 than during the hydrogen release step (step S2).

[0034] After reducing the hydrogen concentration in the hydrogen supply line 3 in the hydrogen release step (step S2) as described above, in the nitrogen supply step (step S4) performed thereafter, by increasing the supply amount of nitrogen N2 additionally supplied to the vent stack 18, the hydrogen remaining in the vent stack 18 can be suitably reduced.

[0035] In addition, in FIGS. 5A and 5B, the case where the nitrogen branch supply line 26 is duplicated by the main line 26a and the sub-line 26b is illustrated. However, the above-described nitrogen supply line 20 may be duplicated into a main line and a sub-line and the same operation may be performed.

[0036] FIG. 6 is another modification of FIG. 4. In this modification, the nitrogen branch supply line 26 branched from the branch point 25 is connected to the downstream side of the valve V3 in the vent line 14 (in other words, the inlet side of the vent stack 18). Even in such a configuration, since nitrogen N2 can be directly supplied to the vent stack 18 via the nitrogen branch supply line 26 in the nitrogen supply step (step S4), the hydrogen remaining in the vent stack 18 can be suitably reduced.

[0037] As described above, according to each of the above embodiments, by supplying nitrogen N2 to the hydrogen supply line 3 in which the hydrogen supply from the hydrogen supply source 6 has been stopped, the hydrogen concentration in the hydrogen supply line 3 is reduced to be equal to or lower than the first reference value. Thereafter, by additionally supplying nitrogen N2 to the vent stack 18 and discharging the hydrogen H2 remaining in the vent stack 18 to the outside from the vent stack 18, the hydrogen H2 remaining in the vent stack 18 can be suitably reduced.

[0038] In addition, without departing from the spirit of the present disclosure, it is possible to appropriately replace the components in the above-described embodiments with well-known components, and the above-described embodiments may be appropriately combined.

[0039] The content described in each of the above embodiments is understood as follows, for example.

[0040] (1) The operation method of a hydrogen supply facility according to one aspect is a hydrogen supply line for supplying hydrogen from a hydrogen supply source to a gas turbine, a vent stack connected to the hydrogen supply line and capable of discharging the hydrogen from the hydrogen supply line to the atmosphere, a nitrogen supply line connected to the hydrogen supply line for supplying nitrogen to the vent stack, and is an operation method of a hydrogen supply facility comprising: a hydrogen supply stop step of stopping the supply of the hydrogen from the hydrogen supply source to the hydrogen supply line; a hydrogen discharge step of discharging the hydrogen from the vent stack by supplying the nitrogen from the nitrogen supply line to the hydrogen supply line; a nitrogen supply step of supplying the nitrogen from the nitrogen supply line to the vent stack after the hydrogen discharge step. It comprises.

[0041] According to the aspect of (1) above, by supplying nitrogen to the hydrogen supply line in which the hydrogen supply from the hydrogen supply source has been stopped, the hydrogen concentration in the hydrogen supply line is reduced. Then, by additionally supplying nitrogen to the vent stack and discharging the hydrogen remaining in the vent stack to the outside from the vent stack, the hydrogen remaining in the vent stack can be suitably reduced.

[0042] (2) In another aspect, in the aspect of (1) above, in the hydrogen discharge step, the hydrogen is discharged from the vent stack so that the hydrogen concentration in the hydrogen supply line becomes equal to or lower than a first reference value.

[0043] According to the aspect of (2) above, by supplying nitrogen to the hydrogen supply line in which the hydrogen supply from the hydrogen supply source has been stopped, the hydrogen concentration in the hydrogen supply line is reduced to be equal to or lower than the first reference value. Then, by additionally supplying nitrogen to the vent stack and discharging the hydrogen remaining in the vent stack to the outside from the vent stack, the hydrogen remaining in the vent stack can be suitably reduced.

[0044] (3) In another aspect, in the aspect of (1) or (2) above, In the hydrogen release step, a process of supplying the nitrogen from the nitrogen supply line to the hydrogen supply line and discharging the mixed gas of the hydrogen and the nitrogen from the vent stack is repeatedly performed until the hydrogen concentration becomes equal to or lower than the first reference value.

[0045] According to the aspect of (3) above, by repeatedly performing the supply of nitrogen from the nitrogen supply line and the discharge of the atmosphere (mixed gas of hydrogen and nitrogen) in the hydrogen supply line from the vent stack with respect to the hydrogen supply line in which the hydrogen supply has been stopped, the hydrogen concentration in the hydrogen supply line can be suitably reduced.

[0046] (4) In another aspect, in any one of the aspects of (1) to (3) above, In the nitrogen supply step, the supply amount of the nitrogen from the nitrogen supply line to the vent stack is increased compared to the supply amount of the nitrogen from the nitrogen supply line to the vent stack in the hydrogen release step.

[0047] According to the aspect of (4) above, after reducing the hydrogen concentration in the hydrogen supply line, by increasing the supply amount of the nitrogen additionally supplied to the vent stack, the hydrogen remaining in the vent stack can be suitably reduced.

[0048] (5) In another aspect, in any one of the aspects of (1) to (4) above, The nitrogen supply line includes a main line and a sub-line provided in parallel to the main line and in the hydrogen release step, the nitrogen is supplied through the main line, and in the nitrogen supply step, the nitrogen is supplied through the main line and the sub-line.

[0049] According to the aspect (5) above, in the hydrogen release step, nitrogen is supplied through the main line among the nitrogen supply lines, so that the amount of nitrogen supplied by the nitrogen supply line is relatively small. On the other hand, in the nitrogen supply step, nitrogen is supplied through both the main line and the sub-line among the nitrogen supply lines, so that the amount of nitrogen supplied by the nitrogen supply line is increased, and the hydrogen remaining in the vent stack can be preferably reduced.

[0050] (6) In another aspect, in any one of the aspects (1) to (5) above, The vent stack is provided with a hydrogen detector for detecting hydrogen in the vent stack.

[0051] According to the aspect (5) above, since the vent stack is provided with a hydrogen detector for detecting hydrogen in the vent stack, hydrogen discharged from the vent stack to the outside can be detected.

[0052] (7) In another aspect, in the aspect (6) above, The hydrogen detector detects the concentration of the hydrogen in the vent stack after the nitrogen supply step is carried out.

[0053] According to the aspect (7) above, after the hydrogen remaining in the vent stack is reduced by carrying out the nitrogen supply step, the hydrogen is detected by the hydrogen detector. Thereby, the presence or absence of hydrogen leakage from each line communicating with the vent stack can be preferably detected by the hydrogen detector.

[0054] (8) In another aspect, in any one of the aspects (1) to (7) above, The nitrogen supply line includes a nitrogen branch supply line connected to the vent stack without passing through the hydrogen supply line, In the nitrogen supply step, the nitrogen is supplied from the nitrogen branch supply line to the vent stack.

[0055] According to the aspect (8) above, the supply of nitrogen to the vent stack in the nitrogen supply step is performed via the nitrogen branched supply line. The nitrogen branched supply line is connected to the vent stack without passing through the hydrogen supply line. As a result, in the nitrogen supply step, nitrogen can be directly supplied to the vent stack via the nitrogen branched supply line, so that the hydrogen remaining in the vent stack can be more suitably reduced.

[0056] (9) In another aspect, in any one of the aspects (1) to (8) above, the hydrogen supply source includes at least one of a hydrogen storage tank in which the hydrogen is stored, a hydrogen production facility, or a hydrogen trailer capable of transporting the hydrogen.

[0057] According to the aspect (9) above, in a hydrogen supply facility including at least one of a hydrogen storage tank in which hydrogen is stored, a hydrogen production facility, or a hydrogen trailer capable of transporting hydrogen, the hydrogen remaining in the vent stack can be suitably reduced.

[0058] (10) A hydrogen supply facility according to one aspect includes a hydrogen supply line for supplying hydrogen from a hydrogen supply source to a gas turbine, a vent stack connected to the hydrogen supply line and capable of discharging the hydrogen from the hydrogen supply line to the atmosphere, a nitrogen supply line connected to the hydrogen supply line and for supplying nitrogen to the vent stack, and is provided with the nitrogen supply line is connected so as to be able to supply nitrogen on the side farther from the hydrogen supply source than a first valve provided between the hydrogen supply source and the vent stack in the hydrogen supply line.

[0059] According to the aspect (10) above, by supplying nitrogen to the hydrogen supply line from which hydrogen supply has been stopped from the hydrogen supply source, the hydrogen concentration in the hydrogen supply line is reduced. Then, by additionally supplying nitrogen to the vent stack and discharging the hydrogen remaining in the vent stack to the outside from the vent stack, the hydrogen remaining in the vent stack can be suitably reduced.

[0060] (11) In another aspect, in the aspect (10) above, it further includes a nitrogen branch supply line connected from the hydrogen supply line to the vent stack without passing through the hydrogen supply line.

[0061] According to the aspect (11) above, by directly supplying nitrogen to the vent stack through the nitrogen branch supply line, the hydrogen remaining in the vent stack can be more suitably reduced.

Explanation of Signs

[0062] 1A, 1B Hydrogen supply facilities 2 Gas turbine 3 Hydrogen supply line 6 Hydrogen supply source 14 Vent line 16 Branch point 18 Vent stack 18a Opening 18b Hydrogen detector 20 Nitrogen supply line 22 Nitrogen supply source 25 Branch point 26 Nitrogen branch supply line V1~V7 Valves

Claims

1. A hydrogen supply line for supplying hydrogen from a hydrogen supply source to a gas turbine, a vent stack connected to the hydrogen supply line and capable of discharging the hydrogen from the hydrogen supply line to the atmosphere, a nitrogen supply line connected to the hydrogen supply line for supplying nitrogen to the vent stack, and an operating method for a hydrogen supply facility comprising: a hydrogen supply stop step of stopping the supply of the hydrogen from the hydrogen supply source to the hydrogen supply line; a hydrogen discharge step of discharging the hydrogen from the vent stack by supplying the nitrogen from the nitrogen supply line to the hydrogen supply line; a nitrogen supply step of supplying the nitrogen from the nitrogen supply line to the vent stack after the hydrogen discharge step; and an operating method for a hydrogen supply facility.

2. The operating method for a hydrogen supply facility according to claim 1, wherein in the hydrogen discharge step, the hydrogen is discharged from the vent stack such that the hydrogen concentration in the hydrogen supply line becomes equal to or less than a first reference value.

3. The operating method for a hydrogen supply facility according to claim 2, wherein in the hydrogen discharge step, the process of supplying the nitrogen from the nitrogen supply line to the hydrogen supply line and discharging the mixed gas of the hydrogen and the nitrogen from the vent stack is repeatedly performed until the hydrogen concentration becomes equal to or less than the first reference value.

4. The operating method for a hydrogen supply facility according to claim 1 or 2, wherein in the nitrogen supply step, the amount of nitrogen supplied from the nitrogen supply line to the vent stack is increased as compared with the amount of nitrogen supplied from the nitrogen supply line to the vent stack in the hydrogen discharge step.

5. The nitrogen supply line includes a main line, and a sub-line provided in parallel with the main line, and in the hydrogen discharge step, the nitrogen is supplied via the main line, and in the nitrogen supply step, the nitrogen is supplied via the main line and the sub-line. The operating method for a hydrogen supply facility according to claim 1 or 2.

6. The operating method for a hydrogen supply facility according to claim 1 or 2, wherein the vent stack is provided with a hydrogen detector for detecting hydrogen in the vent stack.

7. The operating method for a hydrogen supply facility according to claim 6, wherein the hydrogen detector detects the hydrogen concentration in the vent stack after the nitrogen supply step is performed.

8. ​ The nitrogen supply line includes a nitrogen branch supply line connected to the vent stack without passing through the hydrogen supply line. The method for operating a hydrogen supply facility according to claim 1 or 2, wherein in the nitrogen supply step, the nitrogen is supplied from the nitrogen branch supply line to the vent stack.

9. The method for operating a hydrogen supply facility according to claim 1 or 2, wherein the hydrogen supply source includes at least one of a hydrogen storage tank in which the hydrogen is stored, a hydrogen production facility, or a hydrogen trailer capable of transporting the hydrogen.

10. A hydrogen supply line for supplying hydrogen from a hydrogen supply source to a gas turbine; A vent stack connected to the hydrogen supply line and capable of discharging the hydrogen from the hydrogen supply line to the atmosphere; A nitrogen supply line connected to the hydrogen supply line and for supplying nitrogen to the vent stack; comprising The nitrogen supply line is connected so as to be able to supply the nitrogen on the side farther from the hydrogen supply source than a first valve provided between the hydrogen supply source and the vent stack among the hydrogen supply lines, a hydrogen supply facility.

11. The hydrogen supply facility according to claim 10, further comprising a nitrogen branch supply line connected from the hydrogen supply line to the vent stack without passing through the hydrogen supply line.

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