Power generation system

Abstract

The present disclosure provides a power generation system that cools a generator with hydrogen constituting a fuel and prevents at least a reduction in power quality. A power generation system (100) generates power by using liquefied hydrogen stored in a liquefied hydrogen tank (11). The power generation system (100) comprises a turbine (1), a generator (2), a first pipe (3), a liquefied hydrogen supply control device (4), and a second pipe (5). The turbine (1) is driven using hydrogen gas obtained by vaporizing the liquefied hydrogen. The generator (2) is driven by the turbine (1) to generate power. The first pipe (3) supplies the liquefied hydrogen from the liquefied hydrogen tank (11) to the generator (2). The liquefied hydrogen supply control device (4) is provided to the first pipe (3) and adjusts the amount of liquefied hydrogen to be supplied to the generator (2). The second pipe (5) supplies, to the turbine (1), hydrogen gas that has been made into a vapor by cooling the generator (2).

Description

Power generation system

[0001] The present disclosure relates to a hydrogen-fueled power generation system.

[0002] In recent years, hydrogen-fueled power generation systems have been considered in order to realize a carbon-neutral society. A hydrogen-fueled power generation system is disclosed, for example, in Utility Model Registration No. 3229202 (Patent Document 1). The power generation system disclosed in this document has a generator that generates electricity by rotating a turbine, and the turbine is rotated by water vapor produced by burning hydrogen, and the generator generates electricity.

[0003] Furthermore, when hydrogen is used as fuel, it is considered to use liquefied hydrogen (boiling point: 20 K) in consideration of transportation costs, etc. Therefore, Non-Patent Document 1 proposes a power generation system that generates electricity using hydrogen as fuel while utilizing the cold energy of liquefied hydrogen to cool the superconducting coil inside the generator.

[0004] Utility Model Registration No. 3229202

[0005] Yasuyuki Shirai and Masahiro Shiotsu, "Development of Liquid Hydrogen-Cooled Superconducting Energy Equipment," Cryogenic Engineering, 2020, Vol. 55, No. 1, pp. 44-52.

[0006] However, the disclosed technology simply describes the idea of ​​cooling the superconducting coil inside the generator by using the cold energy of the liquefied hydrogen fuel, and does not specifically describe the configuration of a power generation system that does not reduce power quality (frequency, voltage) or quench the superconducting coil. Therefore, a power generation system based on the disclosed technology may experience a reduction in power quality or quench of the superconducting coil.

[0007] Therefore, the present disclosure is intended to solve the above-mentioned problems and aims to provide a power generation system that cools the generator using hydrogen as fuel while at least not causing a deterioration in power quality.

[0008] The power generation system according to the present disclosure generates power using liquefied hydrogen stored in a liquefied hydrogen tank. The power generation system includes a turbine, a generator, a first pipe, a first supply control device, and a second pipe. The turbine is driven by hydrogen gas obtained by vaporizing liquefied hydrogen. The generator is driven by the turbine to generate power. The first pipe supplies liquefied hydrogen from the liquefied hydrogen tank to the generator. The first supply control device is provided in the first pipe and adjusts the amount of liquefied hydrogen supplied to the generator. The second pipe cools the generator and supplies the vaporized hydrogen gas to the turbine.

[0009] According to the present disclosure, the power generation system adjusts the amount of liquefied hydrogen supplied to the generator by the first supply control device, thereby enabling the generator to be cooled with hydrogen as fuel and generating electricity without at least causing a degradation in power quality.

[0010] Fig. 1 is a schematic diagram of a power generation system according to embodiment 1. Fig. 2 is a schematic diagram of a portion of a power generation system including an air compressor and a combustor. Fig. 3 is a schematic diagram of a power generation system according to a modified example of embodiment 1. Fig. 4 is a schematic diagram of a power generation system according to embodiment 2. Fig. 5 is a schematic diagram of a power generation system according to embodiment 3. Fig. 6 is a schematic diagram of a power generation system according to embodiment 4. Fig. 7 is a schematic diagram of a power generation system according to embodiment 5.

[0011] This disclosure describes an example of a power generation system that generates electricity using liquefied hydrogen stored in a liquefied hydrogen tank. In the following example, a hydrogen gas turbine power generation system is described in which hydrogen gas obtained by vaporizing liquefied hydrogen is combusted to obtain the rotational force of a turbine (gas turbine) to drive a generator. However, the power generation system of this disclosure is not limited to hydrogen gas turbine power generation. The power generation system of this disclosure may also be a steam power generation system in which hydrogen gas is combusted in a boiler, and the generated steam is used to obtain the rotational force of a turbine (steam turbine) to drive a generator. Furthermore, the power generation system of this disclosure may also be a power generation system in which a gas turbine and a steam turbine are connected in tandem to the same rotating shaft.

[0012] Although the present disclosure describes an example of a power generation system that generates electricity using only hydrogen gas obtained by vaporizing liquefied hydrogen, the power generation system of the present disclosure may be a hydrogen gas turbine power generation system that uses not only hydrogen gas but also other fuels added to the hydrogen gas and combusted to obtain rotational power for a turbine (gas turbine) to drive a generator.Furthermore, the power generation system of the present disclosure may be a steam power generation system that adds other fuels to the hydrogen gas and combusts it in a boiler, and generates steam to obtain rotational power for a turbine (steam turbine) to drive a generator.

[0013] Hereinafter, a power generation system according to an embodiment will be described with reference to the drawings. In the following description, the same components are denoted by the same reference numerals. The names and functions of the components are also the same. Therefore, detailed description thereof will not be repeated.

[0014] First Embodiment. FIG. 1 is a schematic diagram of a power generation system 100 according to a first embodiment. The power generation system 100 generates power using liquefied hydrogen stored in a liquefied hydrogen tank 11. The power generation system 100 includes a gas turbine 1, a power generator 2, a first pipe 3, a liquefied hydrogen supply control device 4 (first supply control device), a second pipe 5, and a hydrogen gas supply control device 6 (second supply control device). In the power generation system 100, the liquefied hydrogen supply control device 4 adjusts the amount of liquefied hydrogen supplied to the power generator 2, and the hydrogen gas supply control device 6 adjusts the amount of hydrogen gas supplied to the gas turbine 1. However, the power generation system 100 may be configured such that the hydrogen gas supply control device 6 is not provided, and the amount of liquefied hydrogen supplied to the power generator 2 and the amount of hydrogen gas supplied to the gas turbine 1 are adjusted only by the liquefied hydrogen supply control device 4. In other words, the liquefied hydrogen supply control device 4 adjusts the amount of liquefied hydrogen supplied to the power generator 2 so that a sufficient amount of hydrogen gas is supplied to the gas turbine 1 to cool the power generator 2 and ensure stable power generation.

[0015] The gas turbine 1 is driven by hydrogen gas obtained by vaporizing liquefied hydrogen. Specifically, the gas turbine 1 has a combustor that combusts air and hydrogen gas to generate torque by burning the hydrogen gas obtained by vaporizing liquefied hydrogen. FIG. 2 is a schematic diagram of a portion of a power generation system that includes an air compressor 7 and a combustor 8. In FIG. 2, the air compressor 7 that compresses air is provided coaxially with the gas turbine 1. Of course, the air compressor 7 is not limited to being provided coaxially with the gas turbine 1, and may be driven by a separate drive device. The air compressor 7 compresses air taken in from the outside and sends it to the valve 7 a.

[0016] On the other hand, the amount of hydrogen gas obtained by vaporizing liquefied hydrogen supplied to the gas turbine 1 is adjusted by a hydrogen gas supply control device 6. The hydrogen gas supply control device 6 includes a hydrogen gas pressurizer 61 that pressurizes hydrogen gas, a valve 62 provided in a pipe connecting the hydrogen gas pressurizer 61 and the combustor 8, and a flow rate control device 63 that controls the opening and closing of the valve 62 and the valve 7a. The flow rate control device 63 controls the amount of compressed air and pressurized hydrogen gas supplied to the combustor 8 by opening and closing the valve 62 and the valve 7a based on the amount of power generated by the generator 2, the rotation speed of the gas turbine 1, the amount of excitation current of the coil 21a, etc.

[0017] The compressed air and pressurized hydrogen gas may be supplied separately to the combustor 8, or may be mixed together beforehand and supplied. Although the air compressor 7 is provided to supply compressed air to the combustor 8, air may be supplied to the combustor 8 by natural aspiration. Furthermore, although the hydrogen gas supply control device 6 pressurizes hydrogen gas using the hydrogen gas pressurizer 61, hydrogen gas may be supplied to the combustor 8 without being pressurized.

[0018] The generator 2 is driven by the gas turbine 1 to generate electricity. The generator 2 includes a rotor 21, a stator 22, and a container 23 that houses the rotor 21. The rotor 21 can be cooled by supplying liquefied hydrogen to the container 23. The container 23 is a cooling container that surrounds the rotor 21, which is cooled by liquefied hydrogen, with a vacuum layer, and can maintain a low temperature by isolating it from thermal contact with the outside. The container 23 has a supply port 25 through which hydrogen is supplied from the liquefied hydrogen tank 11, and an exhaust port 26 through which hydrogen gas vaporized after cooling the rotor 21 is exhausted.

[0019] The rotor 21 is coaxial with the gas turbine 1 and includes a coil 21a wound with wire and a hollow support member 21b that supports the coil 21a. The coil 21a is preferably a superconducting coil wound with superconducting wire that becomes superconducting at the temperature of liquid hydrogen (approximately 20 K). The generator 2 in which the coil 21a is a superconducting coil is a superconducting generator, and is capable of reducing copper loss and iron loss. The superconducting wire used for the coil 21a is a material that becomes superconducting at the temperature of liquid hydrogen, such as magnesium diboride (MgB ２ ), rare earth copper oxide superconductor (REBCO), bismuth-based high temperature superconductor (Bi-2223, Bi-2212), etc. The coil 21a is not limited to a superconducting coil and may be an ordinary coil, and even an ordinary coil can be cooled to reduce copper loss and iron loss to some extent.

[0020] The first pipe 3 is a pipe that supplies liquefied hydrogen from the liquefied hydrogen tank 11 to the generator 2. The first pipe 3 is connected to a supply port 25 of the generator 2, and a liquefied hydrogen supply control device 4 is provided midway along the pipe. The liquefied hydrogen supply control device 4 is a control device that adjusts the amount of liquefied hydrogen supplied to the generator 2. The liquefied hydrogen supply control device 4 is set, for example, so that the amount of liquefied hydrogen that is reduced by cooling the generator 2 and vaporizing can be estimated in advance from the amount of power generated by the generator 2, the rotation speed of the gas turbine 1, the amount of excitation current of the coil 21 a, etc., and adjusts the amount of liquefied hydrogen supplied to the generator 2.

[0021] The second pipe 5 is a pipe that cools the generator 2 and supplies the vaporized hydrogen gas to the gas turbine 1. The second pipe 5 is connected to the exhaust port 26 of the generator 2, and a hydrogen gas supply control device 6 is provided midway along the second pipe 5. The hydrogen gas supply control device 6 is a control device that adjusts the amount of hydrogen gas supplied to the gas turbine 1. For example, the hydrogen gas supply control device 6 is set so that the amount of hydrogen gas to be supplied to the gas turbine 1 can be estimated in advance from the amount of power generated by the generator 2, the rotation speed of the gas turbine 1, etc., and adjusts the amount of liquid gas to be supplied to the gas turbine 1.

[0022] In this way, the power generation system 100 controls the amount of liquefied hydrogen supplied to the generator 2 with the liquefied hydrogen supply control device 4 and the amount of hydrogen gas supplied to the gas turbine 1 with the hydrogen gas supply control device 6, thereby stably cooling the coil 21a of the generator 2 and controlling the rotation speed of the gas turbine 1. Therefore, the power generation system 100 can suppress deterioration of power quality (frequency, voltage) and the occurrence of quenching of the superconducting coil, and can provide a power generation system that generates safe, high-quality electricity.

[0023] (Modification) In the power generation system 100, the hydrogen gas vaporized by cooling the rotor 21 is supplied to the gas turbine 1 through the second pipe 5. The hydrogen gas vaporized by cooling the rotor 21 is at a lower temperature than room temperature and can still be used as a refrigerant. Therefore, it is conceivable to further cool the stator 22 using the hydrogen gas vaporized by cooling the rotor 21. FIG. 3 is a schematic diagram of a power generation system 100a according to a modification of the first embodiment. Note that in the power generation system 100a, components similar to those in the power generation system 100 shown in FIG. 1 are designated by the same reference numerals, and description thereof will not be repeated.

[0024] In the power generation system 100a, instead of supplying the hydrogen gas vaporized by cooling the rotor 21 directly to the gas turbine 1 from the second piping 5, an exhaust path 5a is provided that supplies the hydrogen gas exhausted from the exhaust port 26 to the second piping 5 through the stator 22, as shown in Fig. 3. Therefore, in the power generation system 100a, by cooling the stator 22 with hydrogen gas, heat generation in the generator 2 is suppressed, enabling stable power generation.

[0025] Second Embodiment The power generation system 100 described in the first embodiment only has a route for supplying liquefied hydrogen stored in the liquefied hydrogen tank 11 to the gas turbine 1 via the generator 2. Therefore, in a power generation system according to a second embodiment, a configuration will be described in which a separate route is provided to supply liquefied hydrogen stored in the liquefied hydrogen tank 11 to the gas turbine 1.

[0026] Figure 4 is a schematic diagram of a power generation system 200 according to a second embodiment. In the power generation system 200, components similar to those of the power generation system 100 shown in Figure 1 and the power generation system 100a shown in Figure 3 are denoted by the same reference numerals, and description thereof will not be repeated. As shown in Figure 4, the power generation system 200 has a third pipe 3a as a path for supplying liquefied hydrogen stored in a liquefied hydrogen tank 11 to the gas turbine 1. A vaporizer 10 is provided midway along the third pipe 3a. The vaporizer 10 is a device that vaporizes the liquefied hydrogen supplied from the liquefied hydrogen tank 11 into hydrogen gas.

[0027] In the power generation system 200, by providing a route that passes through the third pipe 3a in addition to the route that supplies liquefied hydrogen stored in the liquefied hydrogen tank 11 to the gas turbine 1 via the generator 2, it becomes possible to stably supply a larger amount of hydrogen gas to the gas turbine 1. In particular, the power generation system 200 has a configuration that is useful when a large-sized gas turbine 1 is employed.

[0028] Vaporizer 10 is a type of heat exchanger, and can be used as a cooling device by utilizing the cold generated when liquefied hydrogen is vaporized into hydrogen gas. For example, the cold generated by vaporizer 10 may be used in a refrigeration facility in power generation system 200.

[0029] (Modification) In the power generation system 200, the third pipe 3a is provided as a separate path for the purpose of increasing the amount of liquefied hydrogen supplied to the gas turbine 1. However, the purpose of providing the separate path is not limited to increasing the amount of liquefied hydrogen supplied to the gas turbine 1. For example, the separate path may be provided for the purpose of cooling power generation-related equipment other than the generator 2. Figure 5 is a schematic diagram of a power generation system 200a according to a modification of the second embodiment. Note that in the power generation system 200a, components similar to those in the power generation system 200 shown in Figure 4 are designated by the same reference numerals, and description thereof will not be repeated.

[0030] 5, the power generation system 200a further includes a fourth pipe 3b as a path for supplying liquefied hydrogen stored in the liquefied hydrogen tank 11 to the gas turbine 1. Power generation-related equipment 12 is provided along the fourth pipe 3b. The power generation-related equipment 12 includes, for example, at least one of a flywheel battery, a superconducting power storage device, and a synchronous phase modifier.

[0031] In the power generation system 200a, the power generation related equipment 12 is provided for the purpose of contributing to stabilizing power quality by suppressing frequency fluctuations and voltage drops. Since the power generation related equipment 12 also generates heat when operated and needs to be cooled, the power generation related equipment 12 can be cooled by supplying liquefied hydrogen stored in the liquefied hydrogen tank 11 via the fourth piping 3b. By cooling the power generation related equipment 12 and supplying the vaporized hydrogen gas to the gas turbine 1 via the fourth piping 3b, it is also possible to stably supply a larger amount of hydrogen gas to the gas turbine 1.

[0032] Furthermore, if the power generation-related equipment 12 uses a material that becomes superconductive at liquid hydrogen temperature, the superconducting state can be stably maintained by supplying liquefied hydrogen stored in the liquefied hydrogen tank 11 via the fourth pipe 3b.

[0033] A flywheel battery, an example of power generation-related equipment 12, is a power storage device that temporarily converts electrical energy into the physical energy of rotational motion, stores it, and then generates electrical energy from the rotational motion when electricity is needed. Flywheel batteries utilize the inertia of the built-in flywheel, thereby suppressing frequency fluctuations and voltage drops, contributing to improved power quality. However, because flywheel batteries store electrical energy as the physical energy of rotational motion, they face the challenge of reduced efficiency due to mechanical loss in the bearings. Therefore, flywheel batteries utilize a material that becomes superconducting at liquid hydrogen temperatures in the magnetic bearing portion (specifically, a superconducting bulk body is built into the rotating shaft, and superconducting coils are used in the bearings) to achieve contactless operation. This allows flywheel batteries to reduce energy loss and maintenance costs.

[0034] A superconducting magnetic energy storage (SMES), which is an example of the power generation-related facility 12, is a device that stores electrical energy in a coil made of superconducting wire. The superconducting magnetic energy storage device extracts electrical energy stored in the coil, allowing power to be input and output in a short time, and is a power generation-related facility that is useful for stabilizing power systems that require large output in a short time, preventing momentary voltage drops, and responding to load fluctuations.

[0035] A synchronous phase modifier, which is an example of power generation-related equipment 12, is power generation-related equipment installed for purposes such as voltage control and power factor improvement in a power system. A synchronous phase modifier is a no-load synchronous motor that has inertia, which can suppress frequency fluctuations and voltage drops, contributing to improved power quality. Although a synchronous phase modifier generates energy loss during operation, this energy loss can be reduced by cooling the rotating field coil and armature with the cold energy of liquefied hydrogen.

[0036] Embodiment 3 In a power generation system according to Embodiment 3, a configuration will be described in which the amount of liquefied hydrogen supplied from the liquefied hydrogen tank 11 is controlled based on the amount of liquefied hydrogen in the container. Figure 6 is a schematic diagram of a power generation system 300 according to Embodiment 3. Note that in the power generation system 300, components similar to those in the power generation system 200 shown in Figure 4 are designated by the same reference numerals, and description thereof will not be repeated.

[0037] As shown in Fig. 6, the power generation system 300 further includes a level gauge 13 that measures the amount of liquefied hydrogen in the vessel 23. The liquefied hydrogen supply control device 4 adjusts the amount of liquefied hydrogen supplied to the generator 2 based on the measurement result of the level gauge 13. Note that the level gauge 13 is not the only measuring instrument that can measure the amount of liquefied hydrogen used to cool the generator 2, and other measuring instruments such as a pressure gauge that measures the pressure inside the vessel 23 or a flow meter that measures the flow rate of hydrogen gas supplied to the gas turbine 1 may be used. Furthermore, the power generation system 300 may use the level gauge 13 in combination with other measuring instruments.

[0038] The liquefied hydrogen supply control device 4 includes a liquefied hydrogen pressurizing device 41 that pressurizes liquefied hydrogen, a valve 42 provided in a pipe connecting the liquefied hydrogen pressurizing device 41 and the vaporizer 10, a valve 43 provided in a pipe connecting the liquefied hydrogen pressurizing device 41 and the generator 2, and a flow rate control device 44 that controls the opening and closing of the valves 42 and 43. The flow rate control device 44 controls the amount of liquefied hydrogen supplied to the generator 2 by opening and closing the valve 43 based on the measurement results of the level gauge 13. Furthermore, the flow rate control device 44 controls the amount of liquefied hydrogen supplied to the vaporizer 10 by opening and closing the valve 42 based on the amount of power generated by the generator 2, the rotation speed of the gas turbine 1, the amount of excitation current of the coil 21a, etc.

[0039] In this way, power generation system 300 adjusts the amount of liquefied hydrogen supplied to generator 2 using flow control device 44 and valve 43, so that if generator 2 is a superconducting coil, the occurrence of quenching can be suppressed, providing a power generation system that generates safe, high-quality electricity. Furthermore, power generation system 300 adjusts the amount of liquefied hydrogen supplied to vaporizer 10 using flow control device 44 and valve 42, so that a greater amount of hydrogen gas can be stably supplied to gas turbine 1.

[0040] (Modification) Figure 7 is a schematic diagram of a power generation system 300a according to a modification of Embodiment 3. In power generation system 300a, components similar to those of power generation system 300 shown in Figure 6 are denoted by the same reference numerals, and description thereof will not be repeated. As shown in Figure 7, power generation system 300a uses a hydrogen gas supply control device 6 to adjust the amount of hydrogen gas supplied to gas turbine 1.

[0041] The hydrogen gas supply control device 6 includes a hydrogen gas pressurizing device 61 that pressurizes hydrogen gas, a valve 62 provided in a pipe connecting the hydrogen gas pressurizing device 61 and the gas turbine 1, and a flow rate control device 63 that controls the opening and closing of the valve 62. The flow rate control device 63 controls the amount of pressurized hydrogen gas supplied to the gas turbine 1 by opening and closing the valve 62 based on the amount of power generated by the generator 2, the rotation speed of the gas turbine 1, the amount of excitation current of the coil 21a, etc. Note that although the configuration of the combustor, air compressor, etc. is not shown in the figure, the power generation system 300a has a similar configuration to that shown in FIG.

[0042] In this way, the power generation system 300a adjusts the amount of hydrogen gas supplied to the gas turbine 1 using the flow control device 63 and the valve 62, making it possible to stably supply hydrogen gas to the gas turbine 1, thereby providing a power generation system that generates safe, high-quality electricity.

[0043] Fourth Embodiment In the power generation system 100 described in the first embodiment, hydrogen gas is supplied from the generator 2 to the gas turbine 1, but the hydrogen gas supplied to the gas turbine 1 is at a temperature lower than room temperature and can still be used as a refrigerant. Therefore, it is conceivable to use the hydrogen gas for some kind of cooling. Figure 8 is a schematic diagram of a power generation system 400 according to a fourth embodiment. Note that in the power generation system 400, components similar to those in the power generation system 300a shown in Figure 7 are designated by the same reference numerals, and description thereof will not be repeated.

[0044] In the power generation system 400, instead of supplying the hydrogen gas vaporized by cooling the generator 2 directly to the gas turbine 1 through the second pipe 5, a heat exchanger 14 is provided in the second pipe 5 as shown in Fig. 8. Because the hydrogen gas passing through the second pipe 5 has a low temperature, the heat exchanger 14 can utilize the cold energy as a chiller to cool other equipment. The chiller can, for example, cool the intake air of the gas turbine 1 or cool devices other than the power generation system 400.

[0045] Embodiment 5. A power generation system to which a protection circuit is added when the generator is a superconducting generator will be described. Fig. 9 is a schematic diagram of a power generation system 500 according to embodiment 5. Note that in power generation system 500, components similar to those in power generation system 300a shown in Fig. 7 are designated by the same reference numerals, and description thereof will not be repeated.

[0046] As shown in FIG. 9 , the generator 2 has an excitation power supply 15 and slip rings 16 for exciting the rotor 21. The generator 2 has the excitation power supply 15 and slip rings 16, which allow it to vary the current value of the rotating field coil and contribute to stabilizing the power system by supplying lagging reactive power. However, if the rotating field coil is a superconducting coil, if the generator 2 is no longer able to be cooled by liquefied hydrogen and a quench occurs, a large amount of heat is generated inside the coil, causing the coil to burn out. Therefore, the power generation system 500 is provided with a protection circuit in the excitation power supply 15 to prevent large amounts of heat from being generated inside the coil even if the generator 2 is no longer able to be cooled by liquefied hydrogen and a quench occurs. The protection circuit is a circuit that cuts off the current to prevent large amounts of heat from being generated inside the coil. This allows the power generation system 500 to provide a power generation system that generates safe, high-quality electricity.

[0047] The above-described embodiments and modifications may be freely combined as long as there are no restrictions on the combinations. For example, the power generation system 200a according to the modification of the second embodiment may be combined with the configuration of the fourth embodiment or the configuration of the fifth embodiment.

[0048] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present disclosure is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims.

[0049] 1 Gas turbine, 2 Generator, 3 First pipe, 3a Third pipe, 3b Fourth pipe, 4 Liquefied hydrogen supply control device, 5 Second pipe, 5a Exhaust path, 6 Hydrogen gas supply control device, 7 Air compressor, 7a, 42, 43, 62 Valve, 8 Combustor, 10 Vaporizer, 11 Liquefied hydrogen tank, 12 Power generation related equipment, 13 Liquid level gauge, 14 Heat exchanger, 15 Excitation power source, 16 Slip ring, 21 Rotor, 21a Coil, 21b Support material, 22 Stator, 23 Container, 25 Supply port, 26 Exhaust port, 41 Liquefied hydrogen pressurizer, 44, 63 Flow rate control device, 61 Hydrogen gas pressurizer, 100, 100a, 200, 200a, 300, 300a, 400, 500 Power generation system.

Claims

1. A power generation system that generates electricity using liquefied hydrogen stored in a liquefied hydrogen tank, comprising: a turbine driven by hydrogen gas formed by vaporization of liquefied hydrogen; a generator driven by the turbine to generate electricity; a first pipe that supplies liquefied hydrogen from the liquefied hydrogen tank to the generator; a first supply control device provided on the first pipe that adjusts the amount of liquefied hydrogen supplied to the generator; and a second pipe that cools the generator and supplies vaporized hydrogen gas to the turbine.

2. The power generation system according to claim 1, further comprising a second supply control device provided in said second piping for adjusting the amount of hydrogen gas supplied to said turbine.

3. The power generation system according to claim 1 or 2, further comprising a heat exchanger provided midway along said second pipe, said heat exchanger using the hydrogen gas supplied to said turbine as a coolant.

4. The power generation system according to any one of claims 1 to 3, further comprising: a third pipe connecting the first supply control device and the turbine; and a vaporizer provided midway along the third pipe for vaporizing liquefied hydrogen supplied from the liquefied hydrogen tank.

5. The power generation system according to any one of claims 1 to 4, further comprising: a fourth pipe connecting the first supply control device and the turbine; and power generation-related equipment provided midway along the fourth pipe and cooled by liquefied hydrogen supplied from the liquefied hydrogen tank.

6. The power generation system according to claim 5, wherein the power generation-related equipment includes at least one of a flywheel battery, a superconducting power storage device, and a synchronous modifier.

7. A power generation system as described in any one of claims 1 to 6, further comprising a measuring instrument that measures the amount of liquefied hydrogen used to cool the generator, and the first supply control device adjusts the amount of liquefied hydrogen supplied to the generator based on the measurement result of the measuring instrument.

8. The power generation system according to any one of claims 1 to 7, wherein the generator includes a rotor, a stator, and a container that contains the rotor and is supplied with liquefied hydrogen, the rotor is coaxial with the turbine and includes a coil wound with wire, and a hollow support material that supports the coil, and the container has a supply port connected to the first piping and through which liquefied hydrogen is supplied, and an exhaust port that cools the rotor and exhausts vaporized hydrogen gas.

9. The power generation system according to claim 8, wherein the generator has an exhaust path that supplies hydrogen gas exhausted from the exhaust port to the second pipe through the stator.

10. The power generation system according to claim 8 or 9, wherein the generator further includes a level gauge that measures the amount of liquefied hydrogen in the container.

11. The power generation system according to any one of claims 8 to 10, wherein the generator is a superconducting generator, and the coil is a superconducting coil formed by winding a superconducting wire.

12. The power generation system according to claim 11, wherein an excitation power supply for exciting the coil has a protection circuit.

13. A power generation system as described in any one of claims 1 to 12, wherein the first supply control device includes a first pressurizing device that pressurizes the liquefied hydrogen supplied from the liquefied hydrogen tank, and a first control valve that controls the amount of liquefied hydrogen supplied to the generator.

14. The power generation system of claim 2, wherein the second supply control device includes a second compression device that compresses the amount of hydrogen gas supplied to the turbine, and a second control valve that controls the amount of hydrogen gas supplied to the turbine.

15. A power generation system according to any one of claims 1 to 14, further comprising: an air compressor that compresses air; and a combustor that combusts the air compressed by the air compressor with hydrogen gas supplied from the liquefied hydrogen tank, wherein the turbine is rotated by the combustion gas supplied from the combustor.

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