Power generation system or power generation method

Abstract

To provide an efficient power generation system.SOLUTION: There is provided a power generation system comprising a heat source, a reactor for producing hydrogen via low temperature heat chemical water decomposition using supplied heat, a first power generation mechanism that generates power with hydrogen produced by the reactor as fuel, and a supply part for supplying waste heat from the first power generation mechanism together with the heat from the heat source to the reactor.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a power generation system or a power generation method.

Background Art

[0002] As a conventional technique, a method of generating power using waste heat has been proposed (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Generally, waste heat often has a low temperature, and even if power is generated using waste heat, it has been difficult to achieve efficient power generation conventionally.

Means for Solving the Problems

[0006] The main invention of the present disclosure for solving the above-described problems provides, in one aspect, a power generation system including a heat source, a reactor that produces hydrogen through low-temperature thermochemical water splitting using the supplied heat, a first power generation mechanism that generates electricity using the hydrogen produced by the reactor as fuel, and a supply unit that supplies waste heat from the first power generation mechanism to the reactor in addition to the heat from the heat source.

Advantages of the Invention

[0007] According to the present invention, an efficient power generation system can be provided.

Brief Description of the Drawings

[0008]

Figure 1

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Mode for Carrying Out the Invention

[0009] <First Embodiment> While referring to FIGS. 1 to 9, a power generation system 100 which is an embodiment of a power generation method will be described as follows. FIG. 1 is a diagram showing an example of the configuration of the power generation system 100.

[0010] In the specification and drawings, the distinction between solids, liquids, and gases of substances is indicated by attaching (s), (l), and (g) respectively after the substance name.

[0011] (Overview) As shown in FIG. 1, the power generation system 100 includes a heat source 1, a heat exchanger 2, a reactor 3, a hydrogen (H2) tank 4, a compressor 5, a power generation mechanism 6, an ORC power generation mechanism 7, a fan 8, a pump 9, and supply units 10A, 10B, and 10C.

[0012] The heat source 1 includes waste heat discharged from at least one of a power plant and a factory. For example, it is waste heat from a boiler flue or manufacturing equipment. Alternatively, the heat source 1 may include a heat source derived from natural energy such as solar heat.

[0013] The temperature of the heat supplied from the heat source 1 is 100°C (100 degrees Celsius) or more and less than 400°C, and particularly in the case of waste heat from a factory or a power plant, it is 100°C or more and 200°C or less.

[0014] The heat exchanger 2 has a function of heating a medium (low-temperature heating medium) using the heat from the heat source 1. In this embodiment, water is used as the low-temperature heating medium as shown in FIG. 1. In this case, the heat exchanger 2 heats the water to generate steam (100°C or more and 150°C or less). Note that as the low-temperature heating medium that carries heat from the heat source 1, various substances other than water, such as gases like air, can be considered.

[0015] The reactor 3 receives heat supply from a heat exchanger through a low-temperature heating medium and produces hydrogen. The hydrogen production method used by the reactor 3 is low-temperature thermochemical water splitting using alkali metals such as sodium, potassium, and lithium (see Non-Patent Document 1). In this embodiment, sodium is used as the alkali metal, and the details will be described later.

[0016] The hydrogen tank 4 is a tank for storing the hydrogen produced by the reactor 3. The compressor 5 has a function of taking out hydrogen from the hydrogen tank 4, pressurizing it, and supplying it to the power generation mechanism 6.

[0017] The power generation mechanism 6 is a mechanism for generating electricity using hydrogen as fuel. The power generation mechanism 6 includes an engine 61 and a generator 62.

[0018] The engine 61 is a device that generates power using hydrogen as fuel. In this embodiment, a rotary engine is used. The generator 62 obtains power from the engine 61 and generates electricity. The engine 61 generates high-temperature waste heat.

[0019] Note that an engine other than a rotary engine, such as a reciprocating engine or a gas turbine, may be used for the engine 61, or a fuel cell may be used as the power generation mechanism 6. Although any of these devices generates heat, it is preferable to use a rotary engine with a high waste heat temperature as the engine 61. In addition, different from a reciprocating engine, a rotary engine has a large inertial force of the rotor and is suitable for steady operation.

[0020] The ORC power generation mechanism 7 is a mechanism for generating electricity by an organic Rankine cycle (ORC) using an organic medium that vaporizes at 100°C or lower. The ORC power generation mechanism 7 includes an evaporator 71, a turbine 72, a generator 73 driven by the turbine 72, and a condenser 74 (Figure 2).

[0021] The evaporator 71 is a device that heats and evaporates an organic medium. In FIG. 2, an example using silicone oil as the organic medium is shown. The heat source of the evaporator 71 is the heated air or steam at about 100° C. generated in the reactor 3.

[0022] The organic medium evaporated in the evaporator 71 drives the turbine 72, and the generator 73 obtains driving force from the turbine 72 to generate electricity.

[0023] The organic medium after driving the turbine 72 is condensed in the condenser 74 and supplied again to the evaporator 71 by a pump.

[0024] The fan 8 has a function of sending outside air as a cooling medium into the reactor 3.

[0025] The pump 9 has a function of supplying the water cooled in the evaporator 71 to the heat exchanger 2.

[0026] The supply unit 10A has a function of supplying the heat generated in the power generation mechanism 6 to the engine 61. In the present embodiment, the supply unit 10A generates steam at 500° C. or higher and 800° C. or lower using the waste heat of the engine 61, and supplies the generated steam to the reactor 3 through a pipe as a high-temperature heating medium.

[0027] The supply unit 10B is a pipe that supplies the heat from the heat source 1 to the reactor 3 using a low-temperature heating medium. As the low-temperature heating medium, water or air can be considered, but water is used in the present embodiment.

[0028] The supply unit 10C is a pipe that receives the supply of air from the fan 8 and supplies it to the reactor 3 as a cooling medium.

[0029] (Details of the Reactor) Details of the reactor 3 will be described below. The reactor 3 is a device that performs low-temperature thermochemical water splitting by a sodium redox cycle. As shown in FIG. 3, the reactor 3 includes a heat exchange section 31, a reaction section 32, a condensation section 33, a cooling section 34, pipes 35A, 35B, and pipes 37A, 37B, 37C, which are stored inside the storage container 30.

[0030] The storage container 30 is a container that forms the outer shell of the reactor 3 and stores the main devices that make up the reactor 3 inside. The inside of the storage container 30 is filled with an inert gas such as nitrogen to prevent fires and the spread of damage when sodium flows out.

[0031] The reaction section 32 is a sealable container where hydrogen is generated and produced inside. Sodium or a sodium compound is stored in the reaction section 32. The reaction section 32 is connected to the condensation section 33 via pipes 35A and 35B. The sodium stored in the reaction section 32 can move between the condensation section 33 via pipes 35A and 35B. Pipes 37A, 37B, and 37C are connected to the upper part of the reaction section 32, and water, oxygen, and hydrogen are discharged or supplied.

[0032] The heat exchange section 31 is a device that heats and cools the reaction section 32. The heat exchange section 31 is connected to the supply sections 10A, 10B, and 10C and receives the supply of a high-temperature heating medium, a low-temperature heating medium, and a cooling medium from each of them. Valves are provided near the connection parts of the supply sections 10A, 10B, and 10C with the heat exchange section 31, and the pipes can be opened and closed.

[0033] The condensation section 33 is a hollow container that has the function of condensing the sodium vaporized in the reaction section 32. The condensation section 33 is connected to the reaction section 32 via pipes 35A and 35B and exchanges sodium with the reaction section 32.

[0034] Valves that enable opening and closing of the pipes are provided in pipes 35A and 35B respectively. Also, pipes 35A and 35B are heated to prevent the phase change of the passing sodium.

[0035] Pipe 35A connects the upper part of the reaction section 32 and the upper part of the condensation section 33, and pipe 35A has the function of moving the vaporized sodium from the reaction section 32 to the condensation section 33.

[0036] The pipe 35B connects the lower part of the reaction section 32 and the lower part of the condensation section 33, and has a function of flowing liquid sodium from the condensation section 33 to the reaction section 32. The pipe 35B is inclined downward from the condensation section 33 toward the reaction section 32, facilitating the flow of sodium.

[0037] The cooling section 34 is a hollow container attached so as to surround the condensation section 33, and has a function of cooling the condensation section 33. The cooling section 34 is connected to the supply section 10C and receives the supply of air as a cooling medium inside. Also, the cooling section 34 is connected to the supply section 10B and receives the supply of steam (low-temperature heating medium). Therefore, the cooling section 34 can also heat the condensation section 33.

[0038] The pipes 37A, 37B, and 37C are connected to the reaction section 32. Each of the pipes 37A, 37B, and 37C is provided with a valve that enables opening and closing of the pipe. The pipe 37A has a function of supplying water to the reaction section 32, and the pipe 37B has a function of discharging oxygen (g) from the reaction section 32. The pipe 37C connects the reaction section 32 and the hydrogen tank 4 and has a function of supplying hydrogen from the reaction section 32 to the hydrogen tank 4.

[0039] (Hydrogen production) The hydrogen production in the reactor 3 is composed of four processes, namely reaction 1 to reaction 4. Briefly stated, reaction 1 is a process of reacting an alkali metal (sodium in this embodiment) and an alkali metal hydroxide to produce an alkali metal oxide and hydrogen. Reaction 2 is a process of decomposing the alkali metal oxide to produce an alkali metal peroxide and an alkali metal. Reaction 3 is a process of condensing the alkali metal and is carried out in parallel with reaction 2. Reaction 4 is a process of reacting the alkali metal peroxide and water to generate an alkali metal hydroxide and oxygen.

[0040] The details of each reaction will be sequentially described below with reference to FIGS. 4 to 8.

[0041] [Reaction 1] In Reaction 1, first, a low-temperature heating medium and a high-temperature heating medium are supplied to the heat exchange unit 31 by the supply units 10A and 10B, and the reaction unit 32 is heated to 350°C (Fig. 4(a)). Both pipes 35A and 35B are closed.

[0042] With the heating of the reaction unit 32, the liquid sodium and sodium hydroxide (s) stored in the reaction unit 32 are heated, and sodium oxide (s) and hydrogen (g) are generated (Fig. 4(b), (c)). This is an endothermic reaction. The generated hydrogen (g) is taken out from the reaction unit 32 through the pipe 37C and supplied to the hydrogen tank 4.

[0043] 〔Reaction 2〕 Next, using the low-temperature heating medium and the high-temperature heating medium, the reaction unit 32 and the sodium oxide (s) inside it are further heated to 400°C (Fig. 5(a)). On the other hand, a cooling medium is supplied to the cooling unit 34 through the supply unit 10C, and the condensation unit 33 is maintained at 100°C or lower.

[0044] By being heated, sodium oxide (s) decomposes into sodium peroxide (s) and sodium (g) (Fig. 5(b)). Along with the generation of sodium (g), the pipe 37A is opened, and sodium (g) moves to the condensation unit 33.

[0045] When the movement of the generated sodium (g) is completed, the pipe 35A is closed again (Fig. 5(c)).

[0046] By moving all the sodium (g) to the condensation unit 33 in Reaction 2, it is prevented that water and sodium react explosively in Reaction 4 in the subsequent process.

[0047] 〔Reaction 3〕 The sodium (g) that has moved to the condensation unit 33 is cooled to 100°C or lower and condensed into sodium (l, s) (Fig. 5(b)). If sodium (s) is included, the condensation unit 33 may be heated by the cooling unit 34 later to melt the sodium (s).

[0048] 〔Reaction 4〕 In Reaction 4, first, a cooling medium is supplied from the supply unit 10C to the heat exchange unit 31, and the reaction unit 32 is maintained at 110°C (Fig. 6(a)). On the other hand, the condensation unit 33 is kept at 100°C or lower, and sodium (l, s) is retained inside. At the same time, water (l) is injected into the reaction unit 32 from the pipe 37A.

[0049] Inside the reaction unit 32, sodium peroxide (s) reacts with water (l) to produce oxygen (g) and sodium hydroxide (s) (Fig. 6(b)). The injection of water (l) continues until all the sodium peroxide (s) has reacted (Fig. 6(c)). The generated oxygen (g) is discharged from the reaction unit 32 through the pipe 37B.

[0050] After all the sodium peroxide (s) has reacted, the pipe 35B is opened, and sodium (l) moves from the condensation unit 33 to the reaction unit 32 (Fig. 7(a)). After the movement of sodium (l) is completed, the pipe 35B is closed.

[0051] After the completion of Reaction 4, as shown in Fig. 7(b), it is in the same state as at the start of Reaction 1. Fig. 8(a) shows the temperature change of the reactor 3 in Reactions 1 to 4. As shown in this figure, by repeating the cycles of Reactions 1 to 4 in the reactor 3, the production of hydrogen is continued.

[0052] (Thermal efficiency) The power generation efficiency in the power generation system 100 configured as described above will be explained with reference to Fig. 9. In Fig. 9, the movement of heat quantity in the power generation system 100 is indicated by arrows, and the heat quantity consumed in each device and mechanism is calculated.

[0053] The numbers in the parentheses in Fig. 9 indicate the heat quantity supplied to each device and mechanism, and are normalized with the heat quantity supplied from the heat source 1 to the reactor 3 as 100.

[0054] In Fig. 9, it is assumed that 35% of the heat quantity supplied to the reactor 3 is used for hydrogen production, and 65% of the heat quantity is discharged.

[0055] In the ORC power generation mechanism 7, 60% of the heat quantity discharged from the reactor 3 is utilized, and 19% of that 60% of the heat quantity is converted into electricity. Also, in the power generation mechanism 6, a rotary engine is used as the engine 61, and 30% of the heat quantity generated by the combustion of hydrogen is converted into electricity.

[0056] Under such a premise, the heat quantity used and discharged in the hydrogen production in the reactor 3, as well as the power generation efficiency in the ORC power generation mechanism 7 and the power generation mechanism 6, are calculated as shown in FIG. 9.

[0057] Specifically, since the waste heat of the rotary engine which is the engine 61 is at a high temperature, steam (high-temperature heating medium) of 500 °C or higher and 800 °C or lower is generated from the waste heat of the engine, and in addition to the steam (low-temperature heating medium) of 100 °C supplied from the heat source 1, steam of 400 °C or higher can be obtained. By using steam of 400 °C or higher in the reactor 3, low-temperature thermochemical water decomposition that requires a temperature of 400 °C or higher can be carried out.

[0058] In this case, the heat quantity to be supplied from the engine 61 is about 22% of the heat quantity from the heat source 1 (about 75% of the engine waste heat), which is sufficient. This is obvious because the specific enthalpy of superheated steam at 400 °C at 0.1 MPa (1 atmosphere) (3279 kJ / kg) is about 122% of the specific enthalpy of superheated steam at 100 °C (2676 kJ / kg).

[0059] The power generation efficiency of the entire power generation system 100 can be derived as 21.8% by adding the power generation amount 12.8 in the power generation mechanism 6 and the power generation amount 9.0 in the ORC power generation mechanism 7, and since the total power generation amount of the system is 21.8. The power generation system 100 realizes such high-efficiency power generation while using waste heat at 100 °C.

[0060] In addition, when the heat from the heat source 1 is 150°C, the heat supplied to the reactor 3 can be 450°C. Therefore, as shown in Fig. 9(b), the power generation efficiency is further increased to 22.6%. Thus, the higher the temperature supplied from the heat source 1, the higher the power generation efficiency of the system.

[0061] Since the temperature of the heat supplied from the heat source 1 is less than 400°C, hydrogen production cannot be carried out even if this heat is used directly. When hydrogen production is not possible, only ORC power generation can be carried out from the waste heat at 100°C, and the power generation efficiency of the entire system can only be expected to be about 11%.

[0062] On the other hand, in the power generation system 100, by incorporating a power generation mechanism 6 that generates high-temperature waste heat, a temperature of 400°C or higher is realized, enabling hydrogen production by low-temperature thermochemical water decomposition. Then, by carrying out power generation using the produced hydrogen as fuel, high-efficiency power generation as described above is realized.

[0063] In particular, it should be noted that the power generation efficiency of the power generation mechanism 6 is 12.8%, which is more efficient than the ORC power generation mechanism 7. This suggests that only the system of heat source 1 - reactor 3 - power generation mechanism 6 realizes a power generation efficiency equal to or higher than that of the conventional system.

[0064] <Second Embodiment> In the first embodiment, steam is used as the low-temperature heating medium. However, as shown below as the second embodiment, it is also possible to use air as the low-temperature heating medium.

[0065] Fig. 10 shows a power generation system 101 that uses air as the low-temperature heating medium according to the second embodiment. In the power generation system 101, air is used as the low-temperature heating medium heated by the heat exchanger 2. The air heated by the heat exchanger 2 is supplied to the reactor 3 by the supply unit 10B as heated air at 100°C or higher and 150°C or lower.

[0066] In the power generation system 101, since the fan 8 supplies air to the heat exchanger 2 instead of the pump 9, the pump 9 is omitted, resulting in a simple configuration. Other configurations are the same as those of the power generation system 100 of the first embodiment.

[0067] Also in the power generation system 101 as described above, similar to the first embodiment, high-efficiency power generation using hydrogen production by low-temperature thermochemical water splitting can be performed.

[0068] <Modification example> In the first and second embodiments, the power generation systems 100 and 101 are configured to include one reactor 3. However, as a modification example, as shown in FIGS. 11 and 12, a configuration using a plurality of reactors 3 may be employed.

[0069] FIGS. 11 and 12 show power generation systems 100A and 101A in which the low-temperature heating medium is steam and air, respectively. Both systems include a plurality of reactors 3 arranged in parallel.

[0070] In the power generation systems 100A and 101A, the phases of the cycles of reactions 1 to 4 in the hydrogen production process are shifted among the plurality of reactors 3. FIGS. 8(a) to (c) show the cycles of hydrogen production by three reactors 3 (designated as the first to third reactors in the figure), and reaction 1 occurs sequentially in the three reactors 3, resulting in a state where hydrogen is constantly produced in the entire system.

[0071] In the power generation systems 100A and 101A, reaction 1 occurs in one of the reactors 3, and hydrogen is constantly produced and supplied. Since hydrogen is constantly supplied to the power generation mechanism 6, stable power generation can be performed without reducing the power generation efficiency. In addition, high-temperature and low-temperature heating media can always be supplied to one of the reactors 3, reducing the retention of the heating medium and the accompanying heat loss. Therefore, high-efficiency hydrogen production or high-efficiency power generation can be achieved in the power generation systems 100A and 101A.

[0072] (Other modification examples) In each of the above embodiments and modified examples, although the ORC power generation mechanism 7 uses the waste heat of the reactor 3, it may use the waste heat of the power generation mechanism 6. Further, the ORC power generation mechanism 7 may use the waste heat of both the reactor 3 and the power generation mechanism 6. In addition, the ORC power generation mechanism 7 may perform binary power generation instead of organic Rankine cycle power generation.

[0073] In each of the above embodiments and modified examples, if necessary, a compressor for sucking hydrogen from the reactor 3 may be installed between the reactor 3 and the hydrogen tank 4.

[0074] <Effect> The power generation systems 100, 101, 100A, and 101A in the above-described embodiments and modified examples include a reactor 3 that performs hydrogen production by low-temperature thermochemical water splitting using the supplied heat, a power generation mechanism 6 (corresponding to the first power generation mechanism) that generates power using the hydrogen produced by the reactor 3 as fuel, and supply units 10A and 10B. The supply units 10A and 10B supply the waste heat of the power generation mechanism 6 to the reactor 3 in addition to the heat from the heat source 1.

[0075] In the above configuration, by utilizing the waste heat of the power generation mechanism 6, hydrogen production by low-temperature thermochemical water splitting and power generation using hydrogen as fuel are realized. By adopting such a system, power generation using hydrogen as fuel becomes possible even if the heat supplied from the heat source 1 is low-temperature waste heat. In addition, high power generation efficiency can be achieved.

[0076] The power generation systems 100, 101, 100A, and 101A include an ORC power generation mechanism 7 (second power generation mechanism) that generates power using the waste heat of at least one of the power generation mechanism 6 and the reactor 3. The ORC power generation mechanism 7 performs power generation by an organic Rankine cycle.

[0077] In the above configuration, since power generation is performed not only by the power generation mechanism 6 but also by the ORC power generation mechanism 7, waste heat can be effectively utilized and power generation efficiency can be improved. In particular, the organic Rankine cycle can be used for power generation even with low-temperature waste heat of 100°C or lower, so it is suitable for use in the power generation systems 100, 101, 100A, and 101A.

[0078] In the power generation systems 100, 101, 100A, and 101A, waste heat from power plants and factories that was previously discarded unused or inefficiently utilized due to low temperatures is being utilized.

[0079] With the above configuration, since the power generation systems 100, 101, 100A, and 101A effectively utilize waste heat, it becomes possible to improve the resource utilization efficiency and power generation efficiency across society as a whole.

[0080] The power generation mechanism 6 includes a rotary engine as a motor 61 that is driven using hydrogen produced by the reactor 3 as fuel, and a generator 62 that generates electricity using the power obtained from the rotary engine.

[0081] By using the rotary engine as the motor 61, it is possible to obtain high-temperature waste heat while supplying power to the generator 62. The high-temperature waste heat facilitates heat supply to the reactor 3 at 400°C or higher, thereby increasing the efficiency of hydrogen production and thus improving the power generation efficiency of the entire system. Also, since the rotary engine is equipped with a rotor with a large inertial force, high operating efficiency can be obtained when operating at a constant rotational speed. It is suitable as a drive source for the generator 62.

[0082] The temperature of the heat supplied from the heat source 1 is above 100°C and below 400°C. In particular, the temperature of the heat supplied from the heat source 1 is above 100°C and below 200°C.

[0083] The power generation systems 100, 101, 100A, and 101A enable hydrogen production even with waste heat below 400°C where hydrogen production was not possible conventionally, and enable high-efficiency power generation. Since superheated steam can be used to efficiently supply heat of 400°C or higher to the reactor 3, the waste heat is preferably 100°C or higher. The temperature of waste heat in general factories and power plants is 100°C or higher and 200°C or lower, and such waste heat can be utilized efficiently.

[0084] As shown in the modification example, the power generation systems 100A and 101A are equipped with a plurality of reactors 3. Also, the phases of the cycles of the hydrogen production process are different among the plurality of reactors 3.

[0085] With such a configuration, the power generation systems 100, 101, 100A, and 101A can constantly produce hydrogen. Since hydrogen can always be supplied to the power generation mechanism 6, stable power generation becomes possible. Also, the low-temperature and high-temperature heating media can always be supplied to any one of the reactors 3, reducing the retention of the heating media and the accompanying heat loss. Therefore, highly efficient hydrogen production or highly efficient power generation can be realized in the power generation systems 100A and 101A.

Explanation of Reference Numerals

[0086] Power generation systems 100, 101, 100A, 101A Heat source 1 Heat exchanger 2 Reactor 3 Hydrogen tank 4 Compressor 5 Power generation mechanism 6 Engine 61 Generator 62 ORC power generation mechanism 7 Fan 8 Pump 9 Supply units 10A, 10B, 10C

Claims

1. A heat source, a plurality of reactors that use the supplied heat to produce hydrogen by low-temperature thermochemical water splitting using an alkali metal, a first power generation mechanism that generates electricity using the hydrogen produced by the plurality of reactors as fuel, a supply unit that supplies waste heat from the first power generation mechanism to the plurality of reactors in addition to the heat from the heat source, and the phase of the hydrogen production cycle is different among the plurality of reactors, a power generation system.

2. The first power generation mechanism is a device that generates heat, selected from a rotary engine, a reciprocating engine, and a gas turbine that are driven using the hydrogen produced by the plurality of reactors as fuel, a generator that generates electricity using the power obtained from the device, the power generation system according to claim 1.

3. The power generation system according to claim 1 or 2, further comprising a second power generation mechanism that generates electricity using waste heat from at least one of the first power generation mechanism and the plurality of reactors.

4. The second power generation mechanism performs power generation by an organic Rankine cycle or binary power generation, the power generation system according to claim 3.

5. The heat source includes waste heat from at least one of a power plant and a factory, the power generation system according to any one of claims 1 to 4.

6. The temperature of the heat supplied from the heat source is 100 degrees Celsius or more and less than 400 degrees Celsius, the power generation system according to any one of claims 1 to 5.

7. The temperature of the heat supplied from the heat source is 100 degrees Celsius or more and 200 degrees Celsius or less, the power generation system according to any one of claims 1 to 6.

8. The first power generation mechanism has a fuel cell, the power generation system according to any one of claims 1 to 7.

9. A manufacturing process in which a plurality of reactors perform hydrogen production by low-temperature thermochemical water splitting using an alkali metal using the supplied heat, a first power generation process that generates electricity using the hydrogen produced by the manufacturing process as fuel, a second power generation process that generates electricity using waste heat discharged in at least one of the manufacturing process and the first power generation process, a process of adding the waste heat discharged in the first power generation process to the heat from the heat source and supplying it to the manufacturing process, and the phase of the hydrogen production cycle is different among the plurality of reactors, a power generation method.

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