Hydrogen Production System

Abstract

To provide a hydrogen production system that can improve the production cost of hydrocarbon.SOLUTION: A hydrogen production system comprises a hydrogen compound member, a first container, a second container having an internal temperature that is lower than the internal temperature of the first container, and a water feeder that feeds water into the second container. The hydrogen compound member contained in the first container can be moved into the second container, and the hydrogen compound member contained in the second container can be moved into the first container.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a hydrogen production system. [Background technology]

[0002] Patent Document 1 describes a two-dimensional boron hydride sheet that releases hydrogen when heated to 150 to 200° C. Hydrogen is highly reactive and explosive, so Patent Document 1 describes a method for easily generating hydrogen even at room temperature, in which hydrogen is generated by irradiating a two-dimensional boron hydride sheet with light. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-218251 A Summary of the Invention [Problem to be solved by the invention]

[0004] In either case of heating or light irradiation, in order to properly collect the hydrogen released from the two-dimensional boron hydride sheet, it is necessary to release the hydrogen from the two-dimensional boron hydride sheet contained in a sealed container and allow the released hydrogen to flow out of the container. In this case, when releasing hydrogen by heating, not only the two-dimensional boron hydride sheet but also the container is heated, so that an extra amount of heat equivalent to the heat capacity of the container is required during heating, which reduces the thermal efficiency and increases the cost of producing hydrogen. Worsening There were issues such as:

[0005] In view of the above, an object of at least one embodiment of the present disclosure is to provide a hydrogen production system that can improve hydrogen production costs. [Means for solving the problem]

[0006] In order to achieve the above object, the hydrogen production system according to the present disclosure includes a hydrogen compound member, a first container, a second container having an internal temperature lower than an internal temperature of the first container, and a water supply device that supplies water into the second container, and is configured to be capable of moving the hydrogen compound member contained in the first container into the second container and to be capable of moving the hydrogen compound member contained in the second container into the first container. The hydrogen compound member has a chemical formula X, where X is an element other than hydrogen. m H n The powder material containing a two-dimensional arrangement of hydrogen compounds represented by the formula (1) is supported on a particulate carrier, the stoichiometric ratio m:n is 1:1 to 3:4, and the element X is boron. . Effect of the Invention

[0007] According to the hydrogen production system of the present disclosure, after releasing hydrogen from the hydrogen compound member in the first container having a high temperature, the hydrogen compound member is moved into the second container having a low temperature to store hydrogen in the hydrogen compound member, and the hydrogen compound member with the stored hydrogen can be moved back into the first container. With this operation, it is only necessary to raise and lower the temperature of the hydrogen compound member, and temperature changes in the first and second containers that house the hydrogen compound members can be suppressed as much as possible, thereby improving thermal efficiency and, as a result, improving the cost of producing hydrogen. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic diagram illustrating the configuration of a hydrogen production system according to a first embodiment of the present disclosure. [Diagram 2] FIG. 1 is a schematic diagram of an ammonia production system including a heat generation source in a hydrogen production system according to a first embodiment of the present disclosure. [Diagram 3] 1 is a schematic diagram illustrating the configuration of a power generation system including a heat generation source in a hydrogen production system according to a first embodiment of the present disclosure. [Figure 4] 1 is a schematic diagram illustrating the configuration of a power generation system including a heat generation source in a fuel cell system according to a first embodiment of the present disclosure. [Diagram 5] 1 is a schematic diagram of a configuration of an iron-making system including a heat generation source in a fuel cell system according to a first embodiment of the present disclosure. [Figure 6]1 is a schematic diagram illustrating the configuration of a sunlight collecting device serving as a heat generation source in a fuel cell system according to a first embodiment of the present disclosure. [Figure 7] 1 is a schematic diagram illustrating the configuration of a hydrogen production system according to a first embodiment of the present disclosure. [Figure 8] FIG. 2 is a schematic diagram showing the configuration of a first container, a second container, a third container, and a fourth container of the hydrogen production system according to the first embodiment of the present disclosure. [Figure 9] FIG. 2 is a cross-sectional view of a cartridge provided in the hydrogen production system according to the first embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a hydrogen production system according to an embodiment of the present disclosure will be described with reference to the drawings. The embodiment described below shows one aspect of the present disclosure, and does not limit the present disclosure. The embodiment can be modified as desired within the scope of the technical concept of the present disclosure.

[0010] (Embodiment 1) <Configuration of hydrogen production system according to embodiment 1 of the present disclosure> 1, the hydrogen production system 1 according to the first embodiment of the present disclosure includes a first container 2 and a second container 3. The first container 2 and the second container 3 are configured to be capable of accommodating a hydrogen compound member 4. The interior of either or both of the first container 2 and the second container 3 may be configured to have a labyrinth structure (2e, 3e) so that the movement path of the hydrogen compound member 4 inside the first container 2 and the second container 3 is long, for example, so that the hydrogen compound member 4 can move while repeatedly moving up and down inside the first container 2 and the second container 3.

[0011] The hydrogen compound member 4 has the chemical formula X, where X is an element other than hydrogen (H). m H nThe powder material containing a two-dimensional arrangement of hydrogen compounds represented by the formula (I) is supported on a particulate carrier, for example, beads. The stoichiometric ratio m:n is 1:1 to 3:4 (for example, XH, XH2, XH3, XH4, X2H3, X3H4). The element X is, for example, boron (B), but is not limited thereto.

[0012] The first container 2 is provided with a supply port 2a for supplying the hydrogen compound members 4 into the inside of the first container 2, and an outlet 2b for discharging the hydrogen compound members 4 accommodated inside the first container 2. The second container 3 is provided with a supply port 3a for supplying the hydrogen compound members 4 into the inside of the second container 3, and an outlet 3b for discharging the hydrogen compound members 4 accommodated inside the second container 3. A first path 5 is provided to connect the outlet 2b and the supply port 3a, and a second path 6 is provided to connect the outlet 3b and the supply port 2a.

[0013] As will be described in the operation below, the hydrogen compound material 4 moves from the first container 2 to the second container 3 via the first path 5, and the hydrogen compound material 4 moves from the second container 3 to the first container 2 via the second path 6. For this reason, a device for moving the hydrogen compound material 4, which is a particulate substance, is provided in each of the first path 5 and the second path 6. The configuration of such a device is not particularly limited, and for example, a powder feeder can be provided as such a device in each of the first path 5 and the second path 6.

[0014] The first path 5 is provided with a first heat exchanger 7 for cooling the hydrogen compound member 4 moving through the first path 5. The second path 6 is provided with a second heat exchanger 8 for heating the hydrogen compound member 4 moving through the second path 6. The heat medium that exchanges heat with the hydrogen compound member 4 in the first heat exchanger 7 and the second heat exchanger 8 can be shared. In a configuration in which the heat medium is shared, a circulation line 9 is provided through which the heat medium circulates between the first heat exchanger 7 and the second heat exchanger 8, and a pump 10 is provided in the circulation line 9 so that the heat medium circulates through the circulation line 9.

[0015] The first container 2 is provided with a gas circulation line 11, one end of which is connected to the lower part, preferably the bottom part, of the first container 2, and the other end of which is connected to the upper part, preferably the top part, of the first container 2. As will be described in the operation described later, hydrogen is released from the hydrogen compound member 4 housed in the first container 2, so that the gas flowing through the gas circulation line 11 is a gas containing hydrogen. The gas circulation line 11 is provided with a compressor 12 for pressurizing the gas, and a third heat exchanger 13 for heating the gas circulating through the gas circulation line 11. The fluid exchanging heat with the gas circulating through the gas circulation line 11 in the third heat exchanger 13 is a fluid that has absorbed heat generated in the heat generation source 19 or a fluid that has been heated by the heat generated in the heat generation source 19. The specific configuration of the heat generation source 19 will be described later. The heating fluid line 20 through which such a fluid flows extends from the heat generation source 19 to pass through the third heat exchanger 13.

[0016] Further, in order to extract a portion of the gas circulating through the gas circulation line 11, an extraction line 15 branches off from the gas circulation line 11. The position where the extraction line 15 branches off is not particularly limited, but it can be, for example, between the compressor 12 and the third heat exchanger 13. The extraction line 15 is connected to a storage tank 16 for storing the gas extracted from the gas circulation line 11 and the gas mainly composed of hydrogen.

[0017] Furthermore, the gas circulation line 11 may be provided with a dust collector 17 (such as a cyclone or a bag filter) for removing solid components from the gas flowing out of the first container 2. In order to return the solid components removed in the dust collector 17 to the supply port 2a, a recovery line 18 may be provided which communicates between the dust collector 17 and the supply port 2a.

[0018] The hydrogen production system 1 includes a water supply device 30 that supplies water into the second container 3. The water supplied by the water supply device 30 into the second container 3 is not limited to liquid water, but may be steam or a fluid containing at least one of liquid water and steam. In the following description, "water" refers to any of these. There are no particular limitations on the configuration of the water supply device 30, but in the first embodiment, as an example, the water supply device 30 is a water storage device for storing water. salary A water tank 31 and one end salary The configuration will be described as including a water supply line 32 connected to the water tank 31 and having the other end connected to the second container 3, and a water supply pump 33 provided on the water supply line 32. In this configuration, it is preferable that the other end of the water supply line 32 is connected to the second container 3 below the hydrogen compound member 4 contained in the second container 3, that is, water is supplied to the second container 3 below the hydrogen compound member 4.

[0019] A supply line 34 for supplying make-up water may be connected to the water supply line 32 between the water supply tank 31 and the water supply pump 33. A make-up pump 35 is provided in the supply line 34. In addition, the water supply line 32 may be provided with at least one heat exchanger for heating the water flowing through the water supply line 32. As such at least one heat exchanger, in the first embodiment, a first heater 36 for heating the water by heat exchange between the gas flowing through the extraction line 15 and the water, and a second heater 37 for heating the water by heat exchange between the fluid flowing through the heating fluid line 20 and the water, are provided. For this reason, the extraction line 15 extends so as to pass through the first heater 36, and the heating fluid line 20 extends so as to pass through the second heater 37.

[0020] One end of an outflow gas line 41 is connected to an upper portion, preferably the top, of the second container 3. The other end of the outflow gas line 41 is connected to a storage tank 40 for storing the gas flowing through the outflow gas line 41, that is, the gas containing oxygen as a main component as described in the operation below. The outflow gas line 41 may be configured to pass through the water supply tank 31. The outflow gas line 41 may also be provided with a dust collector 42 (such as a cyclone or a bag filter) for removing solid components from the gas flowing out of the second container 3. A recovery line 43 may be provided that communicates between the dust collector 42 and the supply port 3a in order to return the solid components removed in the dust collector 42 to the supply port 3a.

[0021] <Operation of the hydrogen production system according to the first embodiment of the present disclosure> Next, the operation of the hydrogen production system 1 according to the first embodiment of the present disclosure will be described. The hydrogen compound member 4 in which hydrogen is stored is accommodated in the first container 2. When the compressor 12 is started, the gas flows out of the first container 2, flows through the gas circulation line 11, and circulates so that the gas flows back into the first container 2. When a fluid that has absorbed heat generated in the heat generation source 19 or a fluid heated by the heat generated in the heat generation source 19 flows through the heating fluid line 20, the fluid exchanges heat with the gas flowing through the gas circulation line 11 in the third heat exchanger 13, thereby heating the latter gas. The flow rate of the fluid supplied to the third heat exchanger 13 is adjusted so that the temperature of the gas becomes about 150°C to about 300°C.

[0022] When the gas is heated in the third heat exchanger 13, the heated gas flows into the first container 2, thereby heating the hydrogen compound member 4 housed in the first container 2. When the temperature of the hydrogen compound member 4 reaches a range of about 150°C to about 300°C, hydrogen is released from the hydrogen compound member 4. When hydrogen is released from the hydrogen compound member 4, the hydrogen concentration in the gas flowing out of the first container 2, i.e., the gas circulating through the gas circulation line 11, increases, and eventually the gas whose main component is hydrogen begins to circulate. Once the gas whose main component is hydrogen begins to circulate, a portion of the circulating gas can be extracted and supplied to the storage tank 16 via the line 15, thereby storing the gas whose main component is hydrogen in the storage tank 16.

[0023] If the first container 2 is configured such that the gas passes through the hydrogen compound member 4 from below to above, the hydrogen compound member 4 may form a fluidized bed due to the flow of the gas. This may cause particles constituting the hydrogen compound member 4 to rub against each other, generating dust and the like. If this dust is entrained in the gas and flows out of the first container 2 to reach the compressor 12, it may cause the compressor 12 to malfunction. If a dust collector 17 is provided in the gas circulation line 11 between the compressor 12 and the first container 2, the dust collector 17 removes the dust and the like, thereby reducing the risk of the compressor 12 malfunctioning. The dust and the like collected by the dust collector 17 may be discarded, but since the dust and the like may contain components containing two-dimensional arrangements of hydrogen compounds, they may be returned to the supply port 2a via the collection line 18 and resupplied to the first container 2 for reuse.

[0024] The hydrogen compound material 4 that has released hydrogen in the first container 2 flows out of the first container 2 through the outlet 2b and is supplied into the second container 3 through the first path 5. When the hydrogen compound material 4 passes through the first path 5, the hydrogen compound material 4 is cooled by heat exchange with a heat medium in the first heat exchanger 7. In the first heat exchanger 7, the flow rate of the heat medium in the first heat exchanger 7 is adjusted so that the hydrogen compound material 4 has a temperature less than about 150°C, preferably between about 80°C and about 150°C. When the hydrogen compound material 4 in such a temperature range is supplied into the second container 3, the temperature inside the second container 3 becomes lower than the temperature inside the first container 2.

[0025] The water supply device 30 supplies water into the second container 3 in a state where the temperature in the second container 3 is less than about 150°C, preferably between about 80°C and about 150°C, and the hydrogen compound member 4 is accommodated in the second container 3. Specifically, by starting the water supply pump 33, water of an appropriate temperature (less than about 150°C, preferably between about 80°C and about 150°C) is supplied from the water supply tank 31 through the water supply line 32 into the second container 3. If the first heater 36 and the second heater 37 are provided, the water is heated in the first heater 36 and the second heater 37 while flowing through the water supply line 32. In this case, the consumption of energy for heating the water in the water supply tank 31 is suppressed, and further, the heat of the gas flowing through the extraction line 15 and the heat of the fluid flowing through the heating fluid line 20 can be effectively utilized, so that the thermal efficiency of the entire hydrogen production system 1 can be improved. Depending on the amount of water in the water tank 31, the make-up water can be supplied to the water supply line 32 via the make-up water line 34 by starting the make-up pump 35 as needed.

[0026] When water is supplied into the second container 3, the water is decomposed into hydrogen and oxygen in the presence of the hydrogen compound member 4, and the hydrogen is occluded in the hydrogen compound member 4. This puts the hydrogen compound member 4 in a state of storing hydrogen. The oxygen flows out of the second container 3 and flows through the outflow gas line 41, and is supplied to and stored in the storage tank 40.

[0027] If the outflow gas line 41 is provided with a dust collector 42, dust and the like are removed by the dust collector 42, so that the amount of dust and the like flowing into the storage tank 40 can be reduced. The dust and the like collected by the dust collector 42 is handled in the same manner as the dust collector 17. In addition, if the outflow gas line 41 is configured to pass through the water supply tank 31, the water contained in the gas flowing through the outflow gas line 41 can be trapped by the water supply tank 31, so that accumulation of water in the storage tank 40 can be suppressed.

[0028] The hydrogen compound members 4, which have hydrogen stored in the second container 3, flow out of the second container 3 through the outlet 3b and are supplied into the first container 2 through the second path 6. When the hydrogen compound members 4 pass through the second path 6, the hydrogen compound members 4 are heated by heat exchange with a heat medium in the second heat exchanger 8. In the second heat exchanger 8, the flow rate of the heat medium in the second heat exchanger 8 is adjusted so that the hydrogen compound members 4 have a temperature of about 150°C to about 300°C.

[0029] In this way, in the hydrogen production system 1 according to the first embodiment, after releasing hydrogen from the hydrogen compound member 4 in the first container 2 having a high temperature, the hydrogen compound member 4 is moved into the second container 3 having a low temperature to store hydrogen in the hydrogen compound member 4, and the hydrogen compound member 4 having stored hydrogen can be moved back into the first container 2. With this operation, it is only necessary to increase and decrease the temperature of the hydrogen compound member 4, and temperature changes in the first container 2 and the second container 3 that house the hydrogen compound member 4 can be suppressed as much as possible, so that the thermal efficiency can be improved, and as a result, the cost of producing hydrogen can be improved. Furthermore, if an exchange unit 38 for removing the hydrogen compound member 4 moving through the first path 5 or the second path 6 and supplying new hydrogen compound member 4 to the first path 5 and the second path 6, i.e., for replacing the hydrogen compound member 4, is provided in at least one of the first path 5 and the second path 6, the hydrogen compound member 4 can be easily replaced by removing the hydrogen compound member 4 from the hydrogen production system 1 and supplying new hydrogen compound member 4 to the hydrogen production system 1 when the hydrogen compound member 4 moves between the first container 2 and the second container 3. The exchange unit 38 may be provided at any position in the first path 5 and the second path 6. Furthermore, the exchange unit 38 may be, for example, a pipe with an on-off valve, but is not limited to this configuration.

[0030] <Modifications of the hydrogen production system according to the first embodiment of the present disclosure> In the above operation, the hydrogen compound material 4 flows into and out of the first container 2 and the second container 3 in a batch manner, but the present invention is not limited to this. The hydrogen production system 1 can be operated such that the hydrogen compound material 4 is filled into the first container 2, the first path 15, the second container 3, and the second path 6, and the hydrogen compound material 4 is circulated between the first container 2 and the second container 3. That is, the hydrogen compound material 4 can be continuously flowed into and out of the first container 2 and the second container 3. In this case, by sharing the heat medium that exchanges heat with the hydrogen compound material 4 in each of the first heat exchanger 7 and the second heat exchanger 8, the hydrogen compound material 4 that moves from the second container 3 to the first container 2 can be heated by the heat of the hydrogen compound material 4 that moves from the first container 2 to the second container 3, so that the thermal efficiency can be further improved, and as a result, the hydrogen production cost can be further improved.

[0031] Furthermore, in the case where the hydrogen compound material 4 flows continuously into and out of the first container 2 and the second container 3, the interiors of the first container 2 and the second container 3 can be configured to have labyrinth structures 2e, 3e, thereby ensuring the residence time of the hydrogen compound material 4 in each container, and hydrogen can be released and stored more reliably.

[0032] <Configuration of heat source 19> FIG. 2 shows a schematic diagram of an ammonia production system 110 including a heat generation source 19. The ammonia production system 110 includes a raw material preparation section 111, an ammonia synthesis section 112, and an ammonia recovery section 113. The ammonia synthesis section 112 includes a heat exchanger 114 that cools a mixed gas of ammonia gas generated from hydrogen and nitrogen and hydrogen and nitrogen, which are the remaining raw materials, before supplying the mixed gas to the ammonia recovery section 113. A fluid that has been heat exchanged with the mixed gas in the heat exchanger 114 is supplied to the hydrogen production system 1 via a heating fluid line 20. In this embodiment, the heat exchanger 114 is a heat generating device serving as the heat generation source 19, and exhaust heat accompanying the ammonia synthesis reaction is used to heat gas in the third heat exchanger 13 (see FIG. 1) and to heat water in the second heater 37 (see FIG. 1). In this embodiment, hydrogen stored in the storage tank 16 can also be supplied to the raw material preparation section 111 and used as a raw material for ammonia synthesis.

[0033] FIG. 3 shows a schematic diagram of a power generation system 120 including a heat generation source 19. The power generation system 120 includes a gas turbine 121 and a generator 122. In the gas turbine 121, air compressed by a compressor 121a is supplied to a combustor 121b to combust fuel, and a turbine 121c is driven by combustion gas generated by the combustion of the fuel. The generator 122 is driven by the turbine 121c to generate power. A part of the exhaust gas from the turbine 121c may be supplied to the hydrogen production system 1 via a heating fluid line 20, or a fluid heated by heat exchange with the exhaust gas in a heat exchanger (not shown) may be supplied to the hydrogen production system 1 via the heating fluid line 20. In this embodiment, the gas turbine 121 is a heat generating device serving as the heat generation source 19, and exhaust heat from the gas turbine 121 is used to heat gas in the third heat exchanger 13 (see FIG. 1) and to heat water in the second heater 37 (see FIG. 1). In this embodiment, the hydrogen stored in the storage tank 16 can also be used as the fuel supplied to the combustor 121b or as a part of the fuel.

[0034] FIG. 4 shows a schematic diagram of a fuel cell system 130 including a heat generation source 19. The fuel cell system 130 includes a solid oxide fuel cell (SOFC) 131. In the fuel cell 131, electricity is generated by a reaction between air and a fuel such as city gas, and exhaust gas is generated after the reaction. Since the exhaust gas contains reaction heat of this reaction, a part of the exhaust gas from the fuel cell 131 may be supplied to the hydrogen production system 1 via the heating fluid line 20, or a fluid heated by heat exchange with the exhaust gas in a heat exchanger (not shown) may be supplied to the hydrogen production system 1 via the heating fluid line 20. In this embodiment, the fuel cell 131 is a heat generating device serving as the heat generation source 19, and the reaction heat in the fuel cell 131 is used to heat gas in the third heat exchanger 13 (see FIG. 1) and to heat water in the second heater 37 (see FIG. 1). In this embodiment, hydrogen stored in the storage tank 16 may be used as the fuel supplied to the fuel cell 131 or as a part thereof.

[0035] FIG. 5 shows a schematic diagram of an iron-making system 140 including a heat source 19. The iron-making system 140 includes a furnace 141 for reducing iron oxide, a reformer 142 for reforming natural gas, and a heat exchanger 143. Heat generated by burning natural gas is used as heat supplied for the reforming reaction of natural gas in the reformer 142. The heat exchanger 143 exchanges heat between the natural gas to be reformed in the reformer 142 and the combustion gas of natural gas. The combustion gas from the heat exchanger 143 is supplied to the hydrogen production system 1 via the heating fluid line 20. In this embodiment, the reformer 142 is a heat generator serving as the heat source 19, and part of the combustion reaction of natural gas used for reforming natural gas is used to heat gas in the third heat exchanger 13 (see FIG. 1) and to heat water in the second heater 37 (see FIG. 1). In this embodiment, the hydrogen stored in the storage tank 16 can also be used for the reduction reaction of iron oxide in the furnace 141 (Fe2O3+3H2→2Fe+3H2O).

[0036] FIG. 6 shows a schematic diagram of a solar light concentrating device 150 as a heat generation source 19. The solar light concentrating device 150 heats the fluid flowing through the heating fluid line 20 by concentrating and irradiating the fluid with sunlight. The configuration of the solar light concentrating device 150 is not particularly limited, and any type of device such as a parabolic trough, a solar power generation tower, or a parabolic dish can be used, but considering the maximum heating temperature, cost, etc., a parabolic trough type device is preferable. In this form, the heat of sunlight is used to heat the gas in the third heat exchanger 13 (see FIG. 1) and the water in the second heater 37 (see FIG. 1).

[0037] (Embodiment 2) Next, a hydrogen production system according to embodiment 2 will be described. The hydrogen production system according to embodiment 2 is different from embodiment 1 in that the configurations of the first container 2 and the second container 3 are changed. In embodiment 2, the same components as those in embodiment 1 are given the same reference symbols, and detailed descriptions thereof will be omitted.

[0038] <Configuration of hydrogen production system according to embodiment 2 of the present disclosure> 7, the hydrogen production system 1 according to the second embodiment of the present disclosure includes a third container 44 and a fourth container 45 in addition to the first container 2 and the second container 3. The third container 44 is provided between the first container 2 and the second container 3, and the fourth container 45 is provided on the opposite side of the second container 3 to the third container 44.

[0039] As shown in Fig. 8, the first container 2 has inlets 2c and 2d that open at positions opposite to each other. Similarly, the second container 3, the third container 44, and the fourth container 45 each have inlets 3c, 44c, and 45c and outlets 3d, 44d, and 45d that open at positions opposite to each other, respectively. The outlet 2d of the first container 2 and the inlet 44c of the third container 44 are connected, the outlet 44d of the third container 44 and the inlet 3c of the second container 3 are connected, and the outlet 3d of the second container 3 and the inlet 45c of the fourth container 45 are connected. Although not shown in either Fig. 7 or 8, the outlet 45d of the fourth container 45 is configured to communicate with the inlet 2c of the first container 2 via a path not shown.

[0040] As shown in FIG. 7, the hydrogen production system 1 according to the second embodiment uses a cartridge 50 containing a hydrogen compound member 4 (see FIG. 9). The cartridge 50 includes a porous cylindrical member 51 and two lids 52, 52 that close both open ends of the cylindrical member 51. A seal member 53 such as an O-ring is provided on the outer circumferential surface of each of the lids 52, 52. The cartridge 50 can be installed in the first container 2 such that the lids 52, 52 of the cartridge 50 are fitted to the inlet 2c and outlet 2d (see FIG. 8) of the first container 2, respectively, and the cylindrical member 51 is positioned inside the first container 2. The gaps between each lid 52 and the inlet 2c and the outlet 2d are sealed by the seal member 53. The cartridge 50 can be installed in the second container 3, the third container 44, and the fourth container 45 in the same manner.

[0041] 9, the hydrogen compound member 4 is accommodated inside the cylindrical member 51. The size of the holes formed in the cylindrical member 51 is smaller than the particle size of the hydrogen compound member 4 so that the hydrogen compound member 4 does not escape from the holes formed in the cylindrical member 51. Since the hydrogen compound member 4 is accommodated inside the cylindrical member 51, the hydrogen compound member 4 is accommodated in each of the first container 2, the second container 3, the third container 44, and the fourth container 45 by placing the cartridge 50 in each of the first container 2, the second container 3, the third container 44, and the fourth container 45 as shown in FIG.

[0042] 7, a first purge line 61 is connected to the third container 44. The first purge line 61 is connected to the storage tank 16. An on-off valve 62, a tank 63 storing water, a surge tank 64, and a vacuum pump 65 are sequentially provided on the first purge line 61 in the direction from the third container 44 toward the storage tank 16. A branch line 71 branched from the water supply line 32 and a second purge line 72 connected to the outflow gas line 41 are connected to the fourth container 45. The other configurations are the same as those of the first embodiment.

[0043] <Operation of the hydrogen production system according to the second embodiment of the present disclosure> Next, the operation of the hydrogen production system 1 according to the second embodiment of the present disclosure will be described with reference to Fig. 7. The cartridge 50 housing the hydrogen compound member 4 with hydrogen stored therein is placed in the first container 2. In the same operation as in the first embodiment, when the gas heated in the third heat exchanger 13 flows into the first container 2, the cylindrical member 51 of the cartridge 50 placed in the first container 2 is porous, so that the heated gas flows into the cylindrical member 51 and heats the hydrogen compound member 4. As a result, hydrogen is released from the hydrogen compound member 4, and the gas mainly composed of hydrogen is stored in the storage tank 16 in the same operation as in the first embodiment.

[0044] When the release of hydrogen in the first container 2 is completed, the cartridge 50 installed in the first container 2 is moved to the third container 44 and installed in the third container 44. At the same time as this operation, another cartridge 50 housing a hydrogen compound member 4 in which hydrogen is stored is installed in the first container 2, and the release of hydrogen can be continued in the first container 2 by the above-mentioned operation.

[0045] After the cartridge 50 is placed in the third container 44, the on-off valve 62 is opened and the vacuum pump 65 is started to allow the gas inside the third container 44 to flow out from the third container 44. Since the cylindrical member 51 of the cartridge 50 is porous, the gas inside the cartridge 50, mainly hydrogen, also flows out from the cylindrical member 51 and flows out from the third container 44. The temperature of the gas inside the cartridge 50 immediately after being moved from the first container 2 is about 150°C to about 300°C, but by allowing the gas inside the cartridge 50 to flow out, the temperature inside the cartridge 50, i.e., the hydrogen compound member 4, is lowered. The hydrogen compound member 4 is preferably cooled to a temperature of less than about 150°C, preferably about 80°C or higher and less than about 150°C. The gas flowing out from the third container 44, mainly hydrogen, flows through the first purge line 61 and is supplied to the storage tank 16. While flowing through the first purge line 61, the moisture contained in the gas is trapped in the tank 63. Furthermore, in cases where the amount of gas flowing through the first purge line 61 increases suddenly, such as immediately after the vacuum pump 65 is started, the surge tank 64 can regulate the flow of gas.

[0046] Next, the cartridge 50 installed in the third container 44 is moved to the second container 3 and installed in the second container 3. At the same time as this operation, the cartridge 50 installed in the first container 2 is moved to the third container 44 and installed in the third container 44, and the gas inside the cartridge 50 can be removed by the above-mentioned operation. Furthermore, another cartridge 50 containing a hydrogen compound member 4 in which hydrogen is stored is installed in the first container 2, and the release of hydrogen can be continued in the first container 2 by the above-mentioned operation.

[0047] After the cartridge 50 is installed in the second container 3, when the water supply device 30 supplies water at an appropriate temperature into the second container 3, the water flows into the cartridge 50 installed in the second container 3. As a result, hydrogen is absorbed into the hydrogen compound member 4 according to the principle described in the first embodiment, and the hydrogen compound member 4 is in a state of storing hydrogen. In addition, since the cartridge 50 installed in the second container 3 has hydrogen removed in the third container 44, the second container 3 is prevented from carrying hydrogen by the cartridge 50. If a reaction occurs in which water is decomposed into hydrogen and oxygen in a state in which hydrogen is brought into the second container 3, there is a risk of explosion due to the reaction between oxygen and hydrogen in the second container 3, but this risk can be reduced. The oxygen generated when hydrogen is absorbed into the hydrogen compound member 4 flows out of the second container 3 and is stored in the storage tank 40 in the same manner as in the first embodiment.

[0048] Next, the cartridge 50 installed in the second container 3 is moved to the fourth container 45 and installed in the fourth container 45. At the same time as this operation, the cartridge 50 installed in the third container 44 is moved to the second container 3 and installed in the second container 3. Install At the same time, the cartridge 50 installed in the first container 2 is moved to the third container 44 and installed in the third container 44, and by the above-mentioned operation, hydrogen is absorbed in the hydrogen compound member 4 in the cartridge 50 installed in the second container 3 and the gas inside the cartridge 50 installed in the third container 44 can be removed. Furthermore, another cartridge 50 containing the hydrogen compound member 4 in which hydrogen is stored is installed in the first container 2, and hydrogen can be continuously released from the first container 2 by the above-mentioned operation.

[0049] After the cartridge 50 is installed in the fourth container 45, a part of the water flowing through the water supply line 32 is made to flow into the fourth container 45 via the branch line 71. The water supplied to the second container 3 may be liquid water, steam, or a fluid containing at least one of liquid water and steam, but when the fourth container 45 is provided, it is preferable that the water is in the form of steam (water vapor). When water vapor is made to flow into the fourth container 45, the water vapor flows into the inside of the cartridge 50 installed in the fourth container 45, and the gas, mainly oxygen, that was inside the cartridge 50 flows out from the cartridge 50. The oxygen that flows out from the cartridge 50 flows out from the fourth container 45 together with the water vapor, flows into the outflow gas line 41 via the second purge line 72, and is stored in the storage tank 40 together with the oxygen from the second container 3 in the same operation as in the first embodiment.

[0050] If the cartridge 50 installed in the fourth container 45 is moved to the first container 2 again and installed in the first container 2, hydrogen can be released again by the above-mentioned operation. At the same time, the cartridges 50 installed in the second container 3, the third container 44, and the first container 2 can be moved and installed in the fourth container 45, the second container 3, and the third container 44, respectively, and the above-mentioned operations can be continued. In addition, since oxygen has been removed from the inside of the cartridge 50 in the fourth container 45, the cartridge 50 installed again in the first container 2 is suppressed from bringing oxygen into the first container 2. If hydrogen is released in a state where oxygen has been brought into the first container 2, there is a risk of explosion due to a reaction between oxygen and hydrogen in the first container 2, but such a risk can be reduced.

[0051] As described above, in the hydrogen production system 1 according to the second embodiment, the hydrogen compound member 4 can be moved between the first container 2 and the third container 44, between the third container 44 and the second container 3, between the second container 3 and the fourth container 45, and between the fourth container 45 and the first container 2 by moving the cartridge 50, so that the movement of the hydrogen compound member 4 can be easily performed. In addition, the hydrogen compound member 4 can be replaced by replacing the cartridge 50, so that the replacement of the hydrogen compound member 4 can be easily performed.

[0052] <Modification of the hydrogen production system according to the second embodiment of the present disclosure> In the second embodiment, the hydrogen production system 1 includes a third container 44 and a fourth container 45 in addition to the first container 2 and the second container 3, but is not limited to this embodiment. The hydrogen production system 1 may include only the first container 2 and the second container 3, or may include the third container 44 in addition to the first container 2 and the second container 3, or may include the fourth container 45 in addition to the first container 2 and the second container 3. However, by including the third container 44 and the fourth container 45, the risk of explosion due to the reaction between hydrogen and oxygen can be reduced, as described above.

[0053] In the second embodiment, the outlet 45d of the fourth container 45 and the inlet 2c of the first container 2 are connected to each other via a path not shown, but the present invention is not limited to this embodiment. In addition to the container group consisting of the first container 2, the third container 44, the second container 3, and the fourth container 45, another container group having the same configuration may be provided, and the outlet 45d of the fourth container 45 of one container group may be connected to the inlet 2c of the first container 2 of the other container group. The number of container groups is not limited to two, and three or more container groups may be provided.

[0054] The contents described in each of the above embodiments can be understood, for example, as follows.

[0055] [1] A hydrogen production system according to one embodiment includes: A hydrogen compound member (4); A first container (2); a second container (3) whose internal temperature is lower than the internal temperature of the first container (1); a water supply device (30) for supplying water into the second container (3); Equipped with The hydrogen compound material (4) contained in the first container (2) is movable into the second container (3), and the hydrogen compound material (4) contained in the second container (3) is movable into the first container (2).

[0056] According to the hydrogen production system of the present disclosure, after releasing hydrogen from the hydrogen compound member in the first container having a high temperature, the hydrogen compound member is moved into the second container having a low temperature to store hydrogen in the hydrogen compound member, and the hydrogen compound member with the stored hydrogen can be moved back into the first container. With this operation, it is only necessary to raise and lower the temperature of the hydrogen compound member, and temperature changes in the first and second containers that house the hydrogen compound members can be suppressed as much as possible, thereby improving thermal efficiency and, as a result, improving the cost of producing hydrogen.

[0057] [2] A hydrogen production system according to another embodiment is the hydrogen production system according to [1], a first path (5) through which the hydrogen compound material (4) moves from the first container (2) to the second container (3); a second path (6) through which the hydrogen compound material (4) moves from the second container (3) to the first container (2); a first heat exchanger (7) for cooling the hydrogen compound member (4) moving through the first path (5); a second heat exchanger (8) for heating the hydrogen compound member (4) moving through the second path (6); a circulation line (9) through which a heat medium that exchanges heat with the hydrogen compound member (4) in the first heat exchanger (7) and the second heat exchanger (8) circulates between the first heat exchanger (7) and the second heat exchanger (8); Equipped with.

[0058] According to this configuration, the heat of the hydrogen compound material moving from the first container to the second container can be used to heat the hydrogen compound material moving from the second container to the first container, thereby further improving the thermal efficiency and, as a result, further improving the cost of producing hydrogen.

[0059] [3] A hydrogen production system according to yet another embodiment is the hydrogen production system according to [2], At least one of the first path (5) or the second path (6) is provided with an exchange section (38) for removing the hydrogen compound material (4) moving through the first path (5) or the second path (6) and for supplying new hydrogen compound material (4) different from the removed hydrogen compound material (4) to the first path (5) or the second path (6).

[0060] With this configuration, when the hydrogen compound material moves between the first container and the second container, the hydrogen compound material can be easily replaced by removing the hydrogen compound material from the hydrogen production system and supplying a new hydrogen compound material to the hydrogen production system.

[0061] [4] A hydrogen production system according to yet another embodiment is any one of the hydrogen production systems [1] to [3], Either or both of the first container (2) and the second container (3) are configured to have a labyrinth structure (2e, 3e) inside.

[0062] According to such a configuration, it is possible to ensure the residence time of the hydrogen compound member inside either or both of the first container and the second container, and it is possible to more reliably release and store hydrogen.

[0063] [5] A hydrogen production system according to yet another embodiment is any one of the hydrogen production systems [1] to [4], a gas circulation line (11) through which the gas in the first container (2) circulates so that the gas flows out of the first container (2) and flows back into the first container (2); a dust collector (17) provided in the gas circulation line (11) for removing solid components from the gas flowing through the gas circulation line (11); Equipped with.

[0064] If the first container is configured such that the gas passes from below to above the hydrogen compound member, the hydrogen compound member may form a fluidized bed due to the gas flow. This may cause particles constituting the hydrogen compound member to rub against each other, generating dust and the like. If this dust is entrained in the gas and flows out of the first container, and if a compressor is provided to pressurize the gas, the dust may reach the compressor and cause the compressor to malfunction. In contrast, if a dust collector is provided in the gas circulation line between the compressor and the first container, the dust collector removes the dust and the like, reducing the risk of the compressor malfunctioning.

[0065] [6] A hydrogen production system according to yet another embodiment is the hydrogen production system according to [5], A recovery line (18) is provided for supplying the solid components removed by the dust collector (17) to the hydrogen compound component (4) moving from the second container (3) to the first container (2).

[0066] Since the dust etc. removed by the dust collector may contain components containing two-dimensional arrangements of hydrogen compounds, the dust etc. can be reused in the first container by supplying the dust etc. via a recovery line to the hydrogen compound material moving from the second container to the first container.

[0067] [7] A hydrogen production system according to yet another embodiment is the hydrogen production system according to [1], The hydrogen compound member (4) is accommodated inside a cartridge (50) having a porous cylindrical member (51) with both ends closed with lids (52), The first container (2) and the second container (3) have an inlet (2c / 3c) and an outlet (2d / 3d), the cartridge (50) is installed in the first container (2) such that the lid (52) of the cartridge (50) is fitted into the inlet (2c) and the outlet (2d) of the first container (2), respectively, and the cylindrical member (51) is positioned inside the first container (2), thereby allowing the hydrogen compound member (4) to be accommodated in the first container (2); the cartridge (50) is installed in the second container (3) such that the lid (52) of the cartridge (50) is fitted into the inlet (3c) and the outlet (3d) of the second container (3), respectively, and the cylindrical member (51) is positioned inside the second container (3), thereby allowing the hydrogen compound member (4) to be accommodated in the second container (3); The cartridge (50) installed in the first container (2) is configured to be movable so as to be installed in the second container (3), and the cartridge (50) installed in the second container (3) is configured to be movable so as to be installed in the first container (2).

[0068] According to this configuration, the hydrogen compound member can be moved between the first container and the second container by moving the cartridge, so that the hydrogen compound member can be easily moved between the first container and the second container. In addition, the hydrogen compound member can be replaced by replacing the cartridge, so that the hydrogen compound member can be easily replaced.

[0069] [8] A hydrogen production system according to yet another embodiment is the hydrogen production system according to [7], a third container (44) having an inlet (44c) and an outlet (44d) is provided between the first container (2) and the second container (3); the cartridge (50) is installed in the third container (44) such that the lid (52) of the cartridge (50) is fitted into the inlet (44c) and the outlet (44d) of the third container (44), respectively, and the cylindrical member (51) is positioned inside the third container (44), thereby allowing the hydrogen compound member (4) to be accommodated in the third container (44); the cartridge (50) installed in the first container (2) is configured to be movable to be installed in the third container (44), and the cartridge (50) installed in the third container (44) is configured to be movable to be installed in the second container (3), The hydrogen production system (1) includes a first purge line (61) through which gas in the third vessel (44) is purged.

[0070] With this configuration, hydrogen remaining in the cartridge can be purged in the third container before the hydrogen compound material is moved to the second container, thereby suppressing hydrogen flow into the second container and, as a result, reducing the risk of an explosion due to a reaction between oxygen and hydrogen in the second container.

[0071] [9] A hydrogen production system according to yet another embodiment is the hydrogen production system according to [7] or [8], a fourth container (45) having an inlet (45c) and an outlet (45d) is provided between the second container (3) and the first container (2); the cartridge (50) is installed in the fourth container (45) such that the lid (52) of the cartridge (50) is fitted into the inlet (45c) and the outlet (45d) of the fourth container (45), respectively, and the cylindrical member (51) is positioned inside the fourth container (45), thereby allowing the hydrogen compound member (4) to be accommodated in the fourth container (45); the cartridge (50) installed in the second container (3) is configured to be movable to be installed in the fourth container (45), and the cartridge (50) installed in the fourth container (45) is configured to be movable to be installed in the first container (2), The hydrogen production system (1) includes a second purge line (72) through which gas in the fourth vessel (45) is purged.

[0072] According to this configuration, oxygen remaining in the cartridge can be purged in the fourth container before the hydrogen compound material is moved to the first container, thereby suppressing the flow of oxygen into the first container and, as a result, reducing the risk of an explosion due to a reaction between oxygen and hydrogen in the first container.

[0073]

[10] A hydrogen production system according to yet another embodiment is any one of the hydrogen production systems [1] to [9], a gas circulation line (11) through which the gas in the first container (2) circulates so that the gas flows out of the first container (2) and flows back into the first container (2); a withdrawal line (15) for withdrawing a portion of the gas circulating through the gas circulation line (11); a first heater (36) for heating the water by heat exchange between the gas flowing through the extraction line (15) and the water supplied to the second container (3) by the water supply device (30); Equipped with.

[0074] According to this configuration, the heat of the gas flowing through the extraction line can be effectively utilized to heat the water supplied to the second container, thereby improving the thermal efficiency of the entire hydrogen production system.

[0075]

[11] A hydrogen production system according to yet another embodiment is any one of the hydrogen production systems [1] to

[10] , a gas circulation line (11) through which the gas in the first container (2) circulates so that the gas flows out of the first container (2) and flows back into the first container (2); A heat generating device (heat generating source 19); a third heat exchanger (13) in which the gas circulating through the gas circulation line (11) exchanges heat with a fluid that has absorbed heat generated in the heat generating device (19); Equipped with.

[0076] According to such a configuration, the hydrogen compound member is heated by the heat generated in the heat generating device, so that the thermal efficiency can be further improved, and as a result, the cost of producing hydrogen can be further improved.

[0077]

[12] A hydrogen production system according to yet another embodiment is the hydrogen production system according to

[11] , The apparatus further includes a second heater (37) that heats the water by exchanging heat between the fluid that has exchanged heat with the gas in the third heat exchanger (13) and the water that is supplied to the second container (3) by the water supply device (30).

[0078] With this configuration, the heat of the fluid that has exchanged heat with the gas in the third heat exchanger can be effectively utilized to heat the water supplied to the second container, thereby improving the thermal efficiency of the entire hydrogen production system.

[0079]

[13] A hydrogen production system according to yet another embodiment is any one of the hydrogen production systems [1] to

[10] , a gas circulation line (11) through which the gas circulates so that the gas that has flowed into the first container (2) flows out of the first container (2) and then flows back into the first container (2); A solar light concentrating device (150) for concentrating sunlight; a third heat exchanger (13) in which heat is exchanged between the gas circulating through the gas circulation line (11) and a fluid heated by being irradiated with the sunlight concentrated by the sunlight collecting device (150); Equipped with.

[0080] According to this configuration, the hydrogen compound member is heated by the heat of sunlight, so that the thermal efficiency can be further improved, and as a result, the cost of producing hydrogen can be further improved. [Explanation of symbols]

[0081] 1 Hydrogen production system 2 1st container 2c (First container) inlet 2d (First container) outlet 2e Labyrinth structure 3 Second container 3c (2nd container) inlet 3d (2nd container) outlet 3e Labyrinth structure 4 Hydrogen compound materials 5. Route 1 6. Route 2 7 First heat exchanger 8 Second heat exchanger 9 Circulation Line 11 Gas circulation line 13 Third heat exchanger 15 Extraction Line 17 Dust collector 18 Collection Line 19 Heat source (heat generating device) 30 Water supply equipment 36 1st heater 37 Second heater 38 Exchange section 44 Third container 44c (3rd vessel) entrance 44d (third vessel) outlet 45 4th container 45c (4th container) inlet 45d (4th vessel) outlet 50 Cartridges 51 Cylindrical member 52 Lid 61 No. 1 Purge Line 72 No. 2 Purge Line 150 Solar concentrator

Claims

1. A hydrogen compound member; A first container; a second container having an internal temperature lower than the internal temperature of the first container; a water supply device for supplying water into the second container; Equipped with the hydrogen compound member accommodated in the first container can be moved into the second container, and the hydrogen compound member accommodated in the second container can be moved into the first container; The hydrogen compound member has a configuration in which a powder containing a two-dimensional arrangement of a hydrogen compound represented by a chemical formula XmHn, where X is an element other than hydrogen, is supported on a particulate carrier, the stoichiometric ratio m:n being 1:1 to 3:4, and the element X is boron.

2. a first path along which the hydrogen compound component moves from the first container to the second container; a second path through which the hydrogen compound component moves from the second container to the first container; a first heat exchanger that cools the hydrogen compound member moving through the first path; a second heat exchanger that heats the hydrogen compound member moving through the second path; a circulation line through which a heat medium that exchanges heat with the hydrogen compound member in the first heat exchanger and the second heat exchanger circulates between the first heat exchanger and the second heat exchanger; The hydrogen production system according to claim 1 .

3. 3. The hydrogen production system according to claim 2, wherein at least one of the first path or the second path is provided with an exchange unit for removing the hydrogen compound material moving through the first path or the second path and supplying new hydrogen compound material different from the removed hydrogen compound material to the first path or the second path.

4. The hydrogen production system according to any one of claims 1 to 3, wherein the inside of either or both of the first container and the second container is configured to have a labyrinth structure.

5. a gas circulation line through which the gas in the first container circulates so that the gas flows out of the first container and flows back into the first container; a dust collector provided in the gas circulation line and configured to remove solid components from the gas flowing through the gas circulation line; The hydrogen production system according to any one of claims 1 to 4, comprising:

6. The hydrogen production system according to claim 5 , further comprising a recovery line that supplies the solid components removed by the dust collector to the hydrogen compound component moving from the second container to the first container.

7. The hydrogen compound member is contained in a cartridge having a porous cylindrical member with both ends closed with lids, the first vessel and the second vessel have an inlet and an outlet; the cartridge is placed in the first container such that the inlet and the outlet of the first container are fitted with the lids of the cartridge, respectively, and the cylindrical member is positioned inside the first container, thereby allowing the hydrogen compound member to be accommodated in the first container; the cartridge is placed in the second container such that the lids of the cartridge are fitted to the inlet and the outlet of the second container, respectively, and the cylindrical member is positioned inside the second container, thereby allowing the hydrogen compound member to be accommodated in the second container; 2. The hydrogen production system according to claim 1, wherein the cartridge installed in the first container is movable to be installed in the second container, and the cartridge installed in the second container is movable to be installed in the first container.

8. a third vessel having an inlet and an outlet disposed between the first vessel and the second vessel; the cartridge is placed in the third container such that the inlet and the outlet of the third container are fitted with the lids of the cartridge, respectively, and the cylindrical member is positioned inside the third container, thereby allowing the hydrogen compound member to be accommodated in the third container; The cartridge installed in the first container is movable to be installed in the third container, and the cartridge installed in the third container is movable to be installed in the second container, The hydrogen production system according to claim 7 , further comprising a first purge line through which gas in the third vessel is purged.

9. a fourth vessel having an inlet and an outlet disposed between the second vessel and the first vessel; the cartridge is placed in the fourth container such that the inlet and the outlet of the fourth container are fitted to the lids of the cartridge, respectively, and the cylindrical member is positioned inside the fourth container, thereby allowing the hydrogen compound member to be accommodated in the fourth container; The cartridge installed in the second container is movable to be installed in the fourth container, and the cartridge installed in the fourth container is movable to be installed in the first container, The hydrogen production system according to claim 7 or 8, further comprising a second purge line through which gas in the fourth container is purged.

10. a gas circulation line through which the gas in the first container circulates so that the gas flows out of the first container and flows back into the first container; an extraction line for extracting a portion of the gas circulating through the gas circulation line; a first heater that heats the water by exchanging heat between the gas flowing through the extraction line and the water supplied to the second container by the water supply device; The hydrogen production system according to any one of claims 1 to 9, comprising:

11. a gas circulation line through which the gas in the first container circulates so that the gas flows out of the first container and flows back into the first container; A heat generating device; a third heat exchanger in which the gas circulating through the gas circulation line exchanges heat with a fluid that has absorbed heat generated by the heat generating device; The hydrogen production system according to any one of claims 1 to 10, comprising:

12. 12. The hydrogen production system according to claim 11, further comprising a second heater that heats the water by exchanging heat between the fluid that has exchanged heat with the gas in the third heat exchanger and the water supplied to the second container by the water supply device.

13. a gas circulation line through which the gas circulates so that the gas that has flowed into the first container flows out of the first container and then flows back into the first container; A sunlight concentrating device that concentrates sunlight; a third heat exchanger in which heat is exchanged between the gas circulating through the gas circulation line and a fluid heated by being irradiated with the sunlight concentrated by the sunlight collecting device; The hydrogen production system according to any one of claims 1 to 10, comprising:

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