Hydrogen production system

Abstract

A hydrogen production system 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. The hydrogen compound member housed in the first container is configured to be movable into the second container, and the hydrogen compound member housed in the second container is configured to be movable into the first container.

Description

TECHNICAL FIELD

[0001] The present application relates to a hydrogen manufacturing system.

[0002] This application claims priority based on Japanese Patent Application No. 2021-136405 filed on August 24, 2021, and the contents thereof are incorporated herein. BACKGROUND

[0003] A two-dimensional boron fluoride sheet that releases hydrogen by being heated to 150 to 200°C is described in Patent Literature 1. Since hydrogen is highly reactive and has explosiveness, as a method that can simply generate hydrogen at normal temperature as well, a method of generating hydrogen by irradiating a two-dimensional boron fluoride sheet with light is described in Patent Literature 1.

[0004] PRIOR ART DOCUMENT

[0005] PATENT LITERATURE

[0006] Patent Literature 1: Japanese Patent Publication No. 2019-218251 SUMMARY

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] In order to appropriately recover hydrogen released from a two-dimensional boron fluoride sheet even in either case of heating or light irradiation, it is necessary to release hydrogen from a two-dimensional boron fluoride sheet housed in a sealed container and cause the released hydrogen to flow out of the container. Then, in the case of releasing hydrogen by heating, not only the two-dimensional boron fluoride sheet but also the container are heated together, so that extra heat corresponding to the heat capacity of the container is required at the time of heating, and thus there is a problem that the thermal efficiency is reduced and the cost of manufacturing hydrogen rises.

[0009] In view of the above, an object of at least one embodiment of the present application is to provide a hydrogen manufacturing system capable of improving the cost of manufacturing hydrogen.

[0010] MEANS FOR SOLVING THE PROBLEMS

[0011] In order to achieve the above object, a hydrogen manufacturing system according to the present application includes: a hydrogen compound member; a first container; a second container, the internal temperature of which is lower than the internal temperature of the first container; and a water supply device that supplies water into the second container, the hydrogen compound member housed in the first container is configured to be movable into the second container, and the hydrogen compound member housed in the second container is configured to be movable into the first container.

[0012] EFFECTS OF THE INVENTION

[0013] The hydrogen production system according to the present application can move the hydrogen compound member into the second container having a low temperature after releasing hydrogen from the hydrogen compound member in the first container having a high temperature, store hydrogen in the hydrogen compound member, and move the hydrogen compound member storing hydrogen into the first container again. By this operation, the temperature of the hydrogen compound member is raised or lowered only, and since the temperature of the first and second containers housing the hydrogen compound member can be suppressed from changing as much as possible, the thermal efficiency can be improved, and as a result, the production cost of hydrogen can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a configuration diagram of a hydrogen production system according to Embodiment 1 of the present application.

[0015] Figure 2 is a configuration diagram of an ammonia production system including a heat generating source in a hydrogen production system according to Embodiment 1 of the present application.

[0016] Figure 3 is a configuration diagram of a power generation system including a heat generating source in a hydrogen production system according to Embodiment 1 of the present application.

[0017] Figure 4 is a configuration diagram of a power generation system including a heat generating source in a fuel cell system according to Embodiment 1 of the present application.

[0018] Figure 5 is a configuration diagram of an iron production system including a heat generating source in a fuel cell system according to Embodiment 1 of the present application.

[0019] Figure 6 is a configuration diagram of a sunlight condensing device as a heat generating source in a fuel cell system according to Embodiment 1 of the present application.

[0020] Figure 7 is a configuration diagram of a hydrogen production system according to Embodiment 1 of the present application.

[0021] Figure 8 is a configuration diagram of a first container, a second container, a third container, and a fourth container of a hydrogen production system according to Embodiment 1 of the present application.

[0022] Figure 9 is a cross-sectional view of a cartridge provided in a hydrogen production system according to Embodiment 1 of the present application. DETAILED DESCRIPTION

[0023] Hereinafter, a hydrogen production system according to an embodiment of the present application will be described with reference to the drawings. The following embodiment represents one mode of the present application, and the present application is not limited to the following embodiment. The present application can be modified within the scope of the technical idea thereof.

[0024] (Implementation Method 1)

[0025] <Structure of the hydrogen production system according to Embodiment 1 of the present invention>

[0026] like Figure 1 As shown, the hydrogen production system 1 according to Embodiment 1 of the present invention includes a first container 2 and a second container 3. The first container 2 and the second container 3 are configured to accommodate a hydrogen compound component 4. The interior of either or both of the first container 2 and the second container 3 is configured as a maze structure (2e, 3e) to lengthen the movement path of the hydrogen compound component 4 inside the first container 2 and the second container 3, for example, to allow the hydrogen compound component 4 to move while repeatedly moving up and down inside the first container 2 and the second container 3.

[0027] When an element other than hydrogen (H) is designated as X, the hydrogen compound component 4 contains elements with the chemical formula X. m H n This refers to a structure in which a two-dimensional arrangement of hydrogen compounds is carried on a particle-like carrier, such as beads. The stoichiometric ratio m:n is 1:1 to 3:4 (e.g., XH, XH2, XH3, XH4, X2H3, X3H4). Although not limited, element X is, for example, boron (B).

[0028] The first container 2 is provided with a supply port 2a for supplying the hydrogen compound component 4 into the interior of the first container 2, and an outlet 2b for allowing the hydrogen compound component 4 contained inside the first container 2 to flow out. The second container 3 is provided with a supply port 3a for supplying the hydrogen compound component 4 into the interior of the second container 3, and an outlet 3b for allowing the hydrogen compound component 4 contained inside the second container 3 to flow out. A first path 5 is configured to connect the outlet 2b with the supply port 3a, and a second path 6 is configured to connect the outlet 3b with the supply port 2a.

[0029] As will be explained in the following description, the hydrogen compound component 4 moves from the first container 2 to the second container 3 via the first path 5, and moves from the second container 3 to the first container 2 via the second path 6. Therefore, devices for moving the hydrogen compound component 4, which is a particulate substance, are respectively provided in the first path 5 and the second path 6. While there are no particular limitations on the structure of such devices, for example, a powder feeder can be provided as such a device in the first path 5 and the second path 6.

[0030] A first heat exchanger 7 for cooling the hydrogen compound member 4 moving in the first path 5 is provided in the first path 5. Also, a second heat exchanger 8 for heating the hydrogen compound member 4 moving in the second path 6 is provided in 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, respectively, can be common. In the structure in which the heat medium is common, a circulation line 9 in which the heat medium circulates between the first heat exchanger 7 and the second heat exchanger 8 is provided, and a pump 10 that circulates the heat medium in the circulation line 9 is provided in the circulation line 9.

[0031] A gas circulation line 11 is provided on the first container 2, one end of which is connected to the lower portion, preferably the bottom, of the first container 2, and the other end of which is connected to the upper portion, preferably the top, of the first container 2. As will be described later in the operation, since hydrogen is released from the hydrogen compound member 4 housed in the first container 2, the gas that flows in the gas circulation line 11 is a gas containing hydrogen. A compressor 12 for pressurizing the gas and a third heat exchanger 13 for heating the gas circulating in the gas circulation line 11 are provided in the gas circulation line 11. The fluid that exchanges heat with the gas circulating in the gas circulation line 11 in the third heat exchanger 13 is a fluid that absorbs heat generated in the heat generating source 19, or a fluid that is heated by the heat generated in the heat generating source 19. The specific structure of the heat generating source 19 will be described later. The heating fluid line 20 in which such a fluid flows extends from the heat generating source 19 through the third heat exchanger 13.

[0032] Also, a tapping line 15 is branched from the gas circulation line 11 to tap a portion of the gas circulating in the gas circulation line 11. The position at which the tapping line 15 is branched is not particularly limited, and can be, for example, between the compressor 12 and the third heat exchanger 13. The tapping line 15 is connected to a storage tank 16 that stores the gas, in which hydrogen is the main component, tapped from the gas circulation line 11.

[0033] Further, a dust collecting device 17 (cyclone, bag filter, etc.) that removes solid components from the gas flowing out of the first container 2 can be provided in the gas circulation line 11. A recovery line 18 that communicates the dust collecting device 17 and the supply port 2a can also be provided to return the solid components removed in the dust collecting device 17 to the supply port 2a.

[0034] The hydrogen production system 1 is provided with a water supply device 30 that supplies water into the second container 3. The water supplied into the second container 3 by the water supply device 30 is not limited to liquid water, but can be steam, or a fluid containing at least one of liquid water or steam, and in the following description, "water" refers to any of them. The structure of the water supply device 30 is not particularly limited, and in Embodiment 1, as an example, the water supply device 30 is described as being configured to include a water supply tank 31 that stores water, a water supply line 32 that is connected at one end to the water supply tank 31 and at the other end to the second container 3, and a water supply pump 33 that is provided in the water supply line 32. In this structure, the other end of the water supply line 32 is preferably connected to the second container 3 lower than the hydrogen compound member 4 housed in the second container 3, that is, is supplied with water lower than the hydrogen compound member 4 in the second container 3.

[0035] In the water supply line 32, a makeup line 34 for makeup water is connected between the water supply tank 31 and the water supply pump 33. A makeup pump 35 is provided in the makeup line 34. Also, at least one heat exchanger for heating water circulating in the water supply line 32 is provided in the water supply line 32. As such at least one heat exchanger, in Embodiment 1, a first heater 36 that heats water by heat exchange with gas circulating in the extraction line 15, and a second heater 37 that heats water by heat exchange with fluid circulating in the heating fluid line 20 are provided. Thus, the extraction line 15 extends through the first heater 36, and the heating fluid line 20 extends through the second heater 37.

[0036] In the upper portion of the second container 3, preferably the top portion, one end of an outflow gas line 41 is connected. The other end of the outflow gas line 41 is connected to a tank 40 for storing gas circulating in the outflow gas line 41, which is gas mainly composed of oxygen as described in the operation described later. The outflow gas line 41 can be configured to pass through the water supply tank 31. Also, a dust collector 42 (cyclone separator, bag filter, etc.) that removes solid components from gas outflowing from the second container 3 can be provided in the outflow gas line 41. In order to return the solid components removed in the dust collector 42 to the supply port 3a, a recovery line 43 that communicates the dust collector 42 and the supply port 3a can be provided.

[0037] <Operation of the hydrogen production system according to Embodiment 1 of the present invention>

[0038] Next, the operation of the hydrogen production system 1 according to Embodiment 1 will be described. The hydrogen compound member 4 in which hydrogen is stored is housed in the first container 2. If the compressor 12 is activated, gas circulates so that the gas flows out of the first container 2, circulates in the gas circulation line 11, and flows into the first container 2 again. If the fluid that has absorbed heat generated in the heat generating source 19 or the fluid that has been heated by the heat generated in the heat generating source 19 circulates in the heating fluid line 20, the fluid exchanges heat with the gas that circulates in the gas circulation line 11 in the third heat exchanger 13, and as a result, the gas is heated. The flow rate of the fluid supplied to the third heat exchanger 13 is adjusted so that the gas is heated to a temperature of about 150°C to about 300°C.

[0039] If the gas is heated in the third heat exchanger 13, the heated gas flows into the first container 2, and as a result, the hydrogen compound member 4 housed in the first container 2 is heated. If the temperature of the hydrogen compound member 4 is in the range of about 150°C to about 300°C, hydrogen is released from the hydrogen compound member 4. The gas that flows out of the first container 2 by the release of hydrogen from the hydrogen compound member 4, that is, the hydrogen concentration in the gas that circulates in the gas circulation line 11 increases, and eventually, a gas in which hydrogen is the main component circulates. If the gas in which hydrogen is the main component circulates, a part of the circulating gas is supplied to the storage tank 16 via the extraction line 15, and as a result, the gas in which hydrogen is the main component can be stored in the storage tank 16.

[0040] If the gas passes through the hydrogen compound member 4 from the lower portion to the upper portion in the first container 2, the hydrogen compound member 4 can be configured as a fluidized bed by the flow of the gas. As a result, the particles that configure the hydrogen compound member 4 rub against each other, and dust or the like can be generated. If the dust reaches the compressor 12 along with the gas that flows out of the first container 2, it can become a cause of failure of the compressor 12. If the dust collecting device 17 is provided in the gas circulation line 11 between the compressor 12 and the first container 2, the dust or the like is removed by the dust collecting device 17, and as a result, the possibility of failure of the compressor 12 can be reduced. The dust or the like recovered by the dust collecting device 17 can be discarded, but since there is a possibility that the dust or the like contains a two-dimensionally arranged component that contains a hydrogen compound, it can be returned to the supply port 2a via the recovery line 18 and supplied again into the first container 2 to be reused.

[0041] The hydrogen compound member 4, which releases hydrogen in the first container 2, flows out from the first container 2 via the outlet 2b and is supplied into the second container 3 via the first passage 5. As the hydrogen compound member 4 passes through the first passage 5, the hydrogen compound member 4 is cooled by heat exchange with the 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 member 4 becomes a temperature of less than about 150°C, preferably about 80°C or higher and less than about 150°C. If the hydrogen compound member 4 of such a temperature range is supplied into the second container 3, the internal temperature of the second container 3 becomes lower than the internal temperature of the first container 2.

[0042] The temperature in the second container 3 is less than about 150°C, preferably about 80°C or higher and less than about 150°C, and in a state in which the hydrogen compound member 4 is accommodated in the second container 3, the water supply device 30 supplies water into the second container 3. Specifically, by activating the water supply pump 33, water of an appropriate temperature (less than about 150°C, preferably about 80°C or higher and less than about 150°C) is supplied from the water supply tank 31 into the second container 3 via the water supply line 32. 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 during the passage in the water supply line 32. In this case, the energy consumption for heating the water in the water supply tank 31 is suppressed, and in addition, the heat of the gas flowing in the extraction line 15 and the fluid flowing in the heating fluid line 20 can be effectively utilized, so that the thermal efficiency of the entire hydrogen production system 1 can be improved. In addition, depending on the amount of water in the water supply tank 31, by appropriately activating the makeup pump 35, makeup water can be supplied to the water supply line 32 via the makeup line 34.

[0043] If 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 absorbed in the hydrogen compound member 4. Thus, the hydrogen compound member 4 becomes a state in which hydrogen is stored. The oxygen flows out from the second container 3 and passes through the outlet gas line 41, and is supplied to the storage tank 40 and stored.

[0044] If the dust collecting device 42 is provided in the outlet gas line 41, dust and the like are removed by the dust collecting device 42, so that the dust and the like flowing into the storage tank 40 can be reduced. The treatment of the dust and the like recovered by the dust collecting device 42 is the same as that of the dust collecting device 17. Also, if the outlet gas line 41 is configured to pass through the water supply tank 31, water contained in the gas flowing in the outlet gas line 41 can be captured by the water supply tank 31, so that the storage of water in the storage tank 40 can be suppressed.

[0045] The hydrogen compound member 4 in the state that hydrogen is stored in the second container 3 is discharged from the second container 3 via the outlet 3b and is supplied into the first container 2 via the second path 6. When the hydrogen compound member 4 passes through the second path 6, the hydrogen compound member 4 is heated by heat exchange with the 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 member 4 becomes a temperature of about 150°C to about 300°C.

[0046] Thus, in the hydrogen manufacturing system 1 according to Embodiment 1, after hydrogen is released from the hydrogen compound member 4 in the first container 2 in which the temperature is high, the hydrogen compound member 4 is moved into the second container 3 in which the temperature is low so that hydrogen is stored in the hydrogen compound member 4, and the hydrogen compound member 4 in which hydrogen is stored can be moved into the first container 2 again. By this action, only the temperature of the hydrogen compound member 4 is raised or lowered, and since the temperature change of the first container 2 and the second container 3 in which the hydrogen compound member 4 is accommodated can be suppressed as much as possible, the thermal efficiency can be improved, and as a result, the manufacturing cost of hydrogen can be improved. Further, if a replacement unit 38 for taking out the hydrogen compound member 4 moving in the first path 5 or the second path 6 and supplying a new hydrogen compound member 4 to the first path 5 and the second path 6, that is, for replacing the hydrogen compound member 4 is provided in at least one of the first path 5 or the second path 6, when the hydrogen compound member 4 moves between the first container 2 and the second container 3, by taking out the hydrogen compound member 4 from the hydrogen manufacturing system 1 and supplying a new hydrogen compound member 4 to the hydrogen manufacturing system 1, the replacement of the hydrogen compound member 4 can be easily performed. In addition, the replacement unit 38 can be provided at any position of the first path 5 and the second path 6. Further, the replacement unit 38 can be provided, for example, as a pipe with an on-off valve, but is not limited to this structure.

[0047] <Embodiment 1 of the hydrogen manufacturing system according to the present application>

[0048] In the above operation, the hydrogen compound member 4 flows into and out of the first container 2 and the second container 3 in a batch manner, but is not limited to this manner. The hydrogen manufacturing system 1 can also be operated so that the hydrogen compound member 4 is filled in the first container 2, the first passage 15, the second container 3, and the second passage 6, and the hydrogen compound member 4 is circulated between the first container 2 and the second container 3. That is, the hydrogen compound member 4 can also flow into and out of the first container 2 and the second container 3 continuously. In the case of this manner, by sharing the heat medium that exchanges heat with the hydrogen compound member 4 in the first heat exchanger 7 and the second heat exchanger 8, respectively, it is possible to heat the hydrogen compound member 4 moving from the second container 3 to the first container 2 by the heat of the hydrogen compound member 4 moving from the first container 2 to the second container 3, and thus it is possible to further improve the thermal efficiency, as a result of which it is possible to further improve the manufacturing cost of hydrogen.

[0049] Also, in the case of the manner in which the hydrogen compound member 4 flows into and out of the first container 2 and the second container 3 continuously, by configuring the inside of the first container 2 and the second container 3 as a labyrinth structure 2e, 3e, it is possible to secure the residence time of the hydrogen compound member 4 in each container, and it is possible to more reliably perform the release of hydrogen and the storage of hydrogen.

[0050] <Structure of heat generating source 19>

[0051] Figure 2 A configuration diagram of an ammonia manufacturing system 110 including the heat generating source 19 is described in the above. The ammonia manufacturing system 110 is provided with a raw material preparation section 111, an ammonia synthesis section 112, and an ammonia recovery section 113. The ammonia synthesis section 112 is provided with a heat exchanger 114 that cools the ammonia gas generated from hydrogen and nitrogen before supplying the mixed gas of the remaining part of the raw material, that is, hydrogen and nitrogen, to the ammonia recovery section 113. The fluid that has exchanged heat with the mixed gas in the heat exchanger 114 is supplied to the hydrogen manufacturing system 1 via the heating fluid line 20. In this manner, the heat exchanger 114 is a heating device as the heat generating source 19, and the waste heat accompanying the ammonia synthesis reaction is used in the heating of the gas in the third heat exchanger 13 (refer to Figure 1 ) and the heating of the water in the second heater 37 (refer to Figure 1 ). In addition, in this manner, it is also possible to supply the hydrogen stored in the storage tank 16 to the raw material preparation section 111 to be used as the ammonia synthesis raw material.

[0052] Figure 3A configuration diagram of a power generation system 120 including the heat source 19 is described in FIG. 1. The power generation system 120 is provided with 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 cause a fuel to burn, and a turbine 121c is driven by combustion gas generated by the burning of the fuel. The generator 122 is driven by the turbine 121c to generate power. A portion of exhaust gas from the turbine 121c can 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 by a not-illustrated heat exchanger can be supplied to the hydrogen production system 1 via the heating fluid line 20. In this mode, the gas turbine 121 is a heating device as the heat source 19, and waste heat of the gas turbine 121 is used in heating of the gas in the third heat exchanger 13 (refer to Figure 1 ) and heating of the water in the second heater 37 (refer to Figure 1 ). In addition, in this mode, hydrogen stored in the storage tank 16 can also be used as the fuel or a portion thereof supplied to the combustor 121b.

[0053] Figure 4 A configuration diagram of a fuel cell system 130 including the heat source 19 is described in FIG. 2. The fuel cell system 130 is provided with a solid oxide fuel cell (SOFC) 131. In the fuel cell 131, electricity is generated by a reaction of air and a fuel such as city gas, and exhaust gas after the reaction is generated. Since reaction heat of the reaction is included in the exhaust gas, a portion of the exhaust gas from the fuel cell 131 can 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 by a not-illustrated heat exchanger can be supplied to the hydrogen production system 1 via the heating fluid line 20. In this mode, the fuel cell 131 is a heating device as the heat source 19, and reaction heat in the fuel cell 131 is used in heating of the gas in the third heat exchanger 13 (refer to Figure 1 ) and heating of the water in the second heater 37 (refer to Figure 1 ). In addition, in this mode, hydrogen stored in the storage tank 16 can also be used as the fuel or a portion thereof supplied to the fuel cell 131.

[0054] Figure 5The document contains 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 modification device 142 for modifying natural gas, and a heat exchanger 143. The heat supplied for the modification reaction of the natural gas in the modification device 142 is generated by burning the natural gas. The heat exchanger 143 allows heat exchange between the modified natural gas in the modification device 142 and the combustion gas of the natural gas. The combustion gas from the heat exchanger 143 is supplied to the hydrogen production system 1 via a heated fluid line 20. In this configuration, the modification device 142 is a heat source 19, and part of the combustion reaction of the natural gas for modification is carried out in a third heat exchanger 13 (see reference). Figure 1 Heating of the gas in the first heater 37 (reference) Figure 1 It is used for heating water in the furnace. In addition, in this method, hydrogen stored in storage tank 16 can also be used for the reduction reaction of iron oxide in furnace 141 (Fe2O3+3H2→2Fe+3H2O).

[0055] Figure 6 The document includes a schematic diagram of a solar concentrator 150, which serves as a heat source 19. The solar concentrator 150 heats the fluid by focusing sunlight onto it and directing it through a heating fluid conduit 20. The structure of the solar concentrator 150 is not particularly limited; for example, any type of device, such as a parabolic trough, solar power tower, or parabolic disk, can be used. However, considering factors such as maximum heating temperature and cost, a parabolic trough type device is preferred. In this configuration, the heat from the sunlight is transferred to the third heat exchanger 13 (see reference 13). Figure 1 Heating of the gas in the first heater 37 (reference) Figure 1 It is used for heating water in )

[0056] (Implementation Method 2)

[0057] Next, the hydrogen production system according to Embodiment 2 will be described. The hydrogen production system according to Embodiment 2 differs from Embodiment 1 in that the structures of the first container 2 and the second container 3 are modified. Furthermore, in Embodiment 2, the same reference numerals are used to denote components that are identical to those in Embodiment 1, and their detailed descriptions are omitted.

[0058] <Structure of the hydrogen production system according to Embodiment 2 of the present invention>

[0059] like Figure 7As shown, the hydrogen production system 1 according to Embodiment 2 of the present invention 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 disposed between the first container 2 and the second container 3, and the fourth container 45 is disposed on the side opposite to the third container 44 relative to the second container 3.

[0060] like Figure 8 As shown, the first container 2 has inlets 2c and 2d that open at opposite positions. Similarly, the second container 3, the third container 44, and the fourth container 45 also have inlets 3c, 44c, and 45c that open at opposite positions, and outlets 3d, 44d, and 45d, respectively. The outlet 2d of the first container 2 is connected to the inlet 44c of the third container 44, the outlet 44d of the third container 44 is connected to the inlet 3c of the second container 3, and the outlet 3d of the second container 3 is connected to the inlet 45c of the fourth container 45. Figure 7 and Figure 8 None of them are shown in the figure, but the outlet 45d of the fourth container 45 is configured to connect to the inlet 2c of the first container 2 via a path not shown.

[0061] like Figure 7 As shown, the hydrogen production system 1 according to Embodiment 2 uses a component 4 containing hydrogen compounds (see reference 4). Figure 9 The container 50 has a porous cylindrical component 51 and two caps 52, 52 that block the openings of the cylindrical component 51 at both ends. O-rings or other sealing components 53 are provided on the outer circumferential surfaces of each cap 52, 52. The inlet 2c and outlet 2d of the first container 2 (see reference) Figure 8 The lids 52 and 52 of the box 50 are respectively fitted onto the first container 2, and the box 50 can be disposed in the first container 2 such that the cylindrical member 51 is located inside the first container 2. Each lid 52 is sealed with a sealing member 53 between itself and the inlet 2c and the outlet 2d. The box 50 can also be disposed in the second container 3, the third container 44 and the fourth container 45 in the same manner.

[0062] like Figure 9 As shown, a hydrogen compound component 4 is housed inside the cylindrical component 51. The size of the pores formed in the cylindrical component 51 is smaller than the particle size of the hydrogen compound component 4, so that the hydrogen compound component 4 will not escape from the pores formed in the cylindrical component 51. Because the hydrogen compound component 4 is housed inside the cylindrical component 51, therefore... Figure 7 As shown, by placing the box 50 in the first container 2, the second container 3, the third container 44 and the fourth container 45 respectively, the hydrogen compound component 4 is respectively contained in the first container 2, the second container 3, the third container 44 and the fourth container 45.

[0063] like Figure 7As shown, the first purge line 61 is connected to the third container 44. The first purge line 61 is connected to the tank 16. On the first purge line 61, in the direction from the third container 44 toward the tank 16, an on-off valve 62, a tank 63 in which water is stored, a buffer tank 64, and a vacuum pump 65 are provided in this order. On the fourth container 45, 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. The other structures are the same as in Embodiment 1.

[0064] <Operation of the hydrogen production system according to Embodiment 2>

[0065] Next, the operation of the hydrogen production system 1 according to Embodiment 2 will be described with reference to FIG. 6. Figure 7 The operation of the hydrogen production system 1 according to Embodiment 2 will be described. The cartridge 50 in which the hydrogen compound member 4 in the state in which hydrogen is stored is accommodated inside is set in the first container 2. By the same operation as in Embodiment 1, if the gas heated by the third heat exchanger 13 flows into the first container 2, since the cylindrical member 51 of the cartridge 50 set in the first container 2 is porous, the heated gas flows into the cylindrical member 51 and heats the hydrogen compound member 4. Thereby, hydrogen is released from the hydrogen compound member 4, and by the same operation as in Embodiment 1, the gas in which hydrogen is a main component is stored in the tank 16.

[0066] After the release of hydrogen is completed in the first container 2, the cartridge 50 set in the first container 2 is moved to the third container 44 to be set in the third container 44. At the same time with this operation, another cartridge 50 in which the hydrogen compound member 4 in the state in which hydrogen is stored is accommodated inside is set in the first container 2, and in the first container 2, the release of hydrogen can be continued by the above operation.

[0067] After the cartridge 50 is set in the third container 44, the on-off valve 62 is opened, and by activating the vacuum pump 65, the gas inside the third container 44 flows 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 from the third container 44. The temperature of the gas inside the cartridge 50 immediately after the cartridge 50 is moved from the first container 2 is about 150°C to about 300°C or so, but by flowing out the gas inside the cartridge 50, the temperature of the inside of the cartridge 50, that is, 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 more and less than about 150°C. The gas (mainly hydrogen) flowing out from the third container 44 flows in the first purge line 61 and is supplied to the tank 16. During the flow in the first purge line 61, the moisture contained in the gas is captured by the tank 63. Also, in the case where the amount of the gas flowing in the first purge line 61 increases sharply as immediately after the vacuum pump 65 is activated, the gas flow can be adjusted in the buffer tank 64.

[0068] Next, the cartridge 50 disposed in the third container 44 is moved to the second container 3 to be disposed in the second container 3. Simultaneously with this operation, the cartridge 50 disposed in the first container 2 is moved to the third container 44 to be disposed in the third container 44, and the internal gas of the cartridge 50 can be removed by the above operation. Further, another cartridge 50 in which the hydrogen storage state hydrogen compound member 4 is housed inside is disposed in the first container 2, and the release of hydrogen can be continued in the first container 2 by the above operation.

[0069] After the cartridge 50 is disposed in the second container 3, if the water supply device 30 supplies water of an appropriate temperature into the second container 3, the water flows into the inside of the cartridge 50 disposed in the second container 3. Thus, according to the principle explained in Embodiment 1, hydrogen is absorbed in the hydrogen storage state hydrogen compound member 4, and the hydrogen storage state hydrogen compound member 4 is formed. In addition, since the cartridge 50 disposed in the second container 3 is removed of hydrogen in the third container 44, the hydrogen is suppressed from being brought into the second container 3 through the cartridge 50. If the reaction of water into hydrogen and oxygen occurs in a state in which hydrogen is brought into the second container 3, the risk of explosion due to the reaction of oxygen and hydrogen is generated in the second container 3, but this risk can be reduced. The oxygen generated when hydrogen is absorbed in the hydrogen compound member 4 is stored in the tank 40 after flowing out from the second container 3, in the same operation as Embodiment 1.

[0070] Next, the cartridge 50 disposed in the second container 3 is moved to the fourth container 45 to be disposed in the fourth container 45. Simultaneously with this operation, the cartridge 50 disposed in the third container 44 is moved to the second container 3 to be disposed in the second container 3, and the cartridge 50 disposed in the first container 2 is moved to the third container 44 to be disposed in the third container 44, and the hydrogen compound member 4 in the cartridge 50 disposed in the second container 3 is caused to absorb hydrogen by the above operation, and the internal gas of the cartridge 50 disposed in the third container 44 can be removed. Further, another cartridge 50 in which the hydrogen storage state hydrogen compound member 4 is housed inside is disposed in the first container 2, and the release of hydrogen can be continued in the first container 2 by the above operation.

[0071] After the cartridge 50 is set in the fourth container 45, a portion of the water flowing in the water supply line 32 is caused to flow into the fourth container 45 via the branch line 71. The water supplied to the second container 3 can be liquid water, steam, a fluid containing at least one of liquid water or steam, but in the case where the fourth container 45 is provided, it is preferable that the water be in the form of steam (water vapor). If water vapor is caused to flow into the fourth container 45, by the water vapor flowing into the inside of the cartridge 50 provided in the fourth container 45, the gas (mainly oxygen) present in the inside of the cartridge 50 flows out of the cartridge 50. The oxygen that has flowed out of the cartridge 50 flows out of the fourth container 45 together with the water vapor, and flows into the effluent 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 by the same action as in Embodiment 1.

[0072] If the cartridge 50 provided in the fourth container 45 is moved again to the first container 2 to be set in the first container 2, hydrogen can be released again by the above action. At the same time, by moving the cartridges 50 provided in the second container 3, the third container 44, and the first container 2 to be provided in the fourth container 45, the second container 3, and the third container 44, respectively, the above respective actions can be continued. In addition, the cartridge 50 set again in the first container 2 has the oxygen removed from the inside of the cartridge 50 in the fourth container 45, so the oxygen is suppressed from being carried into the first container 2 by the cartridge 50. If hydrogen is released in a state where oxygen is carried into the first container 2, there is a risk that an explosion due to the reaction of oxygen and hydrogen will occur in the first container 2, but this risk can be reduced.

[0073] Thus, in the hydrogen production system 1 according to Embodiment 2, by moving the cartridge 50, 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, respectively, so the movement of the hydrogen compound member 4 can be easily performed. In addition, by replacing the cartridge 50, the hydrogen compound member 4 can also be replaced, so the replacement of the hydrogen compound member 4 can be easily performed.

[0074] <Modification of the hydrogen production system according to Embodiment 2 of the present application>

[0075] In Embodiment 2, the hydrogen production system 1 has the third container 44 and the fourth container 45 in addition to the first container 2 and the second container 3, but is not limited to this. It can be a configuration having only the first container 2 and the second container 3, or a configuration having the third container 44 in addition to the first container 2 and the second container 3, or a configuration having the fourth container 45 in addition to the first container 2 and the second container 3. However, by providing the third container 44 and the fourth container 45, as described above, the risk of an explosion due to the reaction of hydrogen and oxygen can be reduced.

[0076] In Embodiment 2, the outlet 45d of the fourth container 45 is connected to the inlet 22c of the first container 2 via a path not shown, but the present application is not limited to this. Another container group having the same structure can be provided in addition to the container group composed of the first container 2, the third container 44, the second container 3, and the fourth container 45, and the outlet 45d of the fourth container 45 of one container group can be connected to the inlet 22c of the first container 2 of another container group. The number of container groups is not limited to two, and three or more container groups can be provided.

[0077] The contents described in each of the above embodiments can be grasped as follows, for example.

[0078] [1] A hydrogen production system according to one aspect, comprising:

[0079] a hydrogen compound member (4);

[0080] a first container (2);

[0081] a second container (3) having an internal temperature lower than that of the first container (1); and

[0082] a water supply device (30) that supplies water into the second container (3),

[0083] the hydrogen compound member (4) housed in the first container (2) is configured to be movable into the second container (3), and the hydrogen compound member (4) housed in the second container (3) is configured to be movable into the first container (2).

[0084] The hydrogen production system according to the present application can move the hydrogen compound member into the second container having a low temperature after releasing hydrogen from the hydrogen compound member in the first container having a high temperature to store hydrogen in the hydrogen compound member, and can move the hydrogen compound member storing hydrogen into the first container again. By this action, only the temperature of the hydrogen compound member is raised or lowered, and since the temperature of the first and second containers housing the hydrogen compound member can be suppressed as much as possible, the thermal efficiency can be improved, and as a result, the production cost of hydrogen can be reduced.

[0085] [2] A hydrogen production system according to another aspect in the hydrogen production system according to [1], comprising:

[0086] a first path (5) through which the hydrogen compound member (4) moves from the first container (2) to the second container (3);

[0087] a second path (6) through which the hydrogen compound member (4) moves from the second container (3) to the first container (2);

[0088] a first heat exchanger (7) that cools the hydrogen compound member (4) moving in the first path (5);

[0089] a second heat exchanger (8) that heats the hydrogen compound member (4) moving in the second path (6); and

[0090] a circulation line (9) in 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).

[0091] According to this structure, the hydrogen compound member moving from the first container to the second container can heat the hydrogen compound member moving from the second container to the first container, and therefore the thermal efficiency can be further improved, and as a result, the manufacturing cost of hydrogen can be further improved.

[0092] [3] The hydrogen manufacturing system according to the still another aspect is the hydrogen manufacturing system according to any one of [1] to [2], in which

[0093] A replacement unit (38) is provided in at least one of the first path (5) or the second path (6), and the replacement unit (38) is used to take out the hydrogen compound member (4) moving in the first path (5) or the second path (6), and supply a new hydrogen compound member (4) different from the taken-out hydrogen compound member (4) to the first path (5) or the second path (6).

[0094] According to this structure, when the hydrogen compound member moves between the first container and the second container, the replacement of the hydrogen compound member can be easily performed by taking out the hydrogen compound member from the hydrogen manufacturing system and supplying a new hydrogen compound member to the hydrogen manufacturing system.

[0095] [4] The hydrogen manufacturing system according to the still another aspect is the hydrogen manufacturing system according to any one of [1] to [3], in which

[0096] Either one or both of the first container (2) and the second container (3) has a labyrinth structure (2e, 3e) in the inside thereof.

[0097] According to this structure, the residence time of the hydrogen compound member in the inside of either one or both of the first container and the second container can be ensured, and the release of hydrogen and the storage of hydrogen can be more reliably performed.

[0098] [5] The hydrogen manufacturing system according to the still another aspect is the hydrogen manufacturing system according to any one of [1] to [4], in which

[0099] a gas circulation line (11) through which a gas is circulated to flow out of the first container (2) and to flow into the first container (2) again.

[0100] a dust collecting device (17) provided in the gas circulation line (11) to remove solid components from the gas flowing through the gas circulation line (11).

[0101] If the gas is caused to pass through the hydrogen compound member from below to above in the first container, the hydrogen compound member can be configured as a fluidized bed by the flow of the gas. Then, the particles configuring the hydrogen compound member can rub against each other to generate dust and the like. If the dust is discharged from the first container along with the gas, the dust can reach the compressor to cause a failure of the compressor in the case where the compressor is provided to pressurize the gas. In this regard, if the dust collecting device is provided in the gas circulation line between the compressor and the first container, the dust and the like are removed by the dust collecting device, so that the possibility of the failure of the compressor can be reduced.

[0102] [6] The hydrogen production system according to the still another aspect in the hydrogen production system according to [5], wherein

[0103] a recovery line (18) that supplies the solid components removed by the dust collecting device (17) to the hydrogen compound member (4) moving from the second container (3) to the first container (2).

[0104] Since the dust and the like removed by the dust collecting device can include components arranged in two dimensions that contain hydrogen compounds, the dust and the like can be reused in the first container by being supplied to the hydrogen compound member moving from the second container to the first container through the recovery line.

[0105] [7] The hydrogen production system according to the still another aspect in the hydrogen production system according to [1],

[0106] the hydrogen compound member (4) is housed in the inside of a case (50) that plugs both ends of a porous cylindrical member (51) with a lid (52),

[0107] the first container (2) and the second container (3) have an inlet (2c / 3c) and an outlet (2d / 3d),

[0108] the case (50) is provided in the first container (2) so as to fit the lid (52) of the case (50) to the inlet (2c) and the outlet (2d) of the first container (2), respectively, and the cylindrical member (51) is located in the inside of the first container (2), whereby the hydrogen compound member (4) is housed in the first container (2),

[0109] The cartridge (50) is disposed in the second container (3) so that the lid (52) of the cartridge (50) is fitted on the inlet (3c) and the outlet (3d) of the second container (3), respectively, and the cylindrical member (51) is located inside the second container (3), whereby the hydrogen compound member (4) can be accommodated in the second container (3),

[0110] The cartridge (50) disposed in the first container (2) is movably configured to be disposed in the second container (3), and the cartridge (50) disposed in the second container (3) is movably configured to be disposed in the first container (2).

[0111] According to this configuration, the hydrogen compound member is moved between the first container and the second container by moving the cartridge, so the hydrogen compound member is easily moved between the first container and the second container. Also, the hydrogen compound member can be replaced by replacing the cartridge, so replacement of the hydrogen compound member can be easily performed.

[0112] [8] The hydrogen production system according to the further aspect is the hydrogen production system according to [7], in which

[0113] A third container (44) having an inlet (44c) and an outlet (44d) is disposed between the first container (2) and the second container (3),

[0114] The cartridge (50) is disposed in the third container (44) so that the lid (52) of the cartridge (50) is fitted on the inlet (44c) and the outlet (44d) of the third container (44), respectively, and the cylindrical member (51) is located inside the third container (44), whereby the hydrogen compound member (4) can be accommodated in the third container (44),

[0115] The cartridge (50) disposed in the first container (2) is movably configured to be disposed in the third container (44), and the cartridge (50) disposed in the third container (44) is movably configured to be disposed in the second container (3),

[0116] The hydrogen production system (1) is provided with a first purge line (61) through which a gas in the third container (44) is purged.

[0117] According to this configuration, the hydrogen remaining in the cartridge can be purged in the third container before the hydrogen compound member is moved to the second container, so the inflow of hydrogen into the second container can be suppressed, and as a result, the risk of explosion in the second container due to the reaction of oxygen and hydrogen can be reduced.

[0118] [9] Another aspect relates to a hydrogen production system in the hydrogen production system of [7] or [8],

[0119] A fourth container (45) having an inlet (45c) and an outlet (45d) is provided between the second container (3) and the first container (2),

[0120] The cartridge (50) is provided in the fourth container (45) so as to fit the lid (52) of the cartridge (50) to the inlet (45c) and the outlet (45d) of the fourth container (45), respectively, and the cylindrical member (51) is located inside the fourth container (45), whereby the hydrogen compound member (4) can be accommodated in the fourth container (45),

[0121] The cartridge (50) provided in the second container (3) is movably configured to be provided in the fourth container (45), and the cartridge (50) provided in the fourth container (45) is movably configured to be provided in the first container (2),

[0122] The hydrogen production system (1) is provided with a second purge line (72) through which a gas in the fourth container (45) is purged.

[0123] According to this configuration, oxygen remaining in the cartridge can be purged in the fourth container before the hydrogen compound member is moved to the first container, so that the inflow of oxygen into the first container can be suppressed, and as a result, the risk of explosion in the first container due to the reaction of oxygen and hydrogen can be reduced.

[0124]

[10] Another aspect relates to a hydrogen production system in the hydrogen production system of any one of [1] to [9], comprising:

[0125] a gas circulation line (11) through which a gas is circulated so as to flow out of the first container (2) and again flow into the first container (2),

[0126] an extraction line (15) through which a portion of the gas circulating in the gas circulation line (11) is extracted, and

[0127] a first heater (36) that heats water supplied to the second container (3) by the water supply device (30) by heat exchange with the gas flowing through the extraction line (15).

[0128] 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, so that the thermal efficiency of the entire hydrogen production system can be improved.

[0129]

[11] The hydrogen production system according to any one of [1] to

[10] , further comprising:

[0130] a gas circulation line (11) through which a gas circulating so that the gas in the first container (2) flows out of the first container (2) and flows into the first container (2) again;

[0131] a heat generating device (heat generating source 19); and

[0132] a third heat exchanger (13) through which the gas circulating in the gas circulation line (11) exchanges heat with a fluid that has absorbed heat generated in the heat generating device (19).

[0133] According to this 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 hydrogen production cost can be further improved.

[0134]

[12] The hydrogen production system according to

[11] , further comprising:

[0135] a second heater (37) that heats the water supplied to the second container (3) by the water supply device (30) by exchanging heat between the fluid that has exchanged heat with the gas in the third heat exchanger (13) and the water.

[0136] According to this configuration, the heat of the fluid that has exchanged heat with the gas in the third heat exchanger is effectively used to heat the water supplied to the second container, so that the thermal efficiency of the entire hydrogen production system can be improved.

[0137]

[13] The hydrogen production system according to any one of [1] to

[10] , further comprising:

[0138] a gas circulation line (11) through which a gas circulating so that the gas flowing into the first container (2) flows out of the first container (2) and flows into the first container (2) again;

[0139] a sunlight condensing device (150) that condenses sunlight;

[0140] a third heat exchanger (13) through which the gas circulating in the gas circulation line (11) exchanges heat with a fluid that is heated by being irradiated with the sunlight condensed by the sunlight condensing device (150).

[0141] According to this configuration, the hydrogen compound member is heated by the heat of the sunlight, so that the thermal efficiency can be further improved, and as a result, the hydrogen production cost can be further improved.

[0142] Explanation of symbols

[0143] 1-hydrogen production system, 2-first container, 2c-inlet of first container, 2d-outlet of first container, 2e-maze structure, 3-second container, 3c-inlet of second container, 3d-outlet of second container, 3e-maze structure, 4-hydrogen compound member, 5-first path, 6-second path, 7-first heat exchanger, 8-second heat exchanger, 9-circulation line, 11-gas circulation line, 13-third heat exchanger, 15-extraction line, 17-dust collecting device, 18-recovery line, 19-heat generating source (heat generating device), 30-water supply device, 36-first heater, 37-second heater, 38-replacement unit, 44-third container, 44c-inlet of third container, 44d-outlet of third container, 45-fourth container, 45c-inlet of fourth container, 45d-outlet of fourth container, 50-box, 51-cylindrical member, 52-cover, 61-first purge line, 72-second purge line, 150-solar light condensing device.

Claims

1. A hydrogen production system comprising: a hydrogen compound member; a first container; a second container, an inside temperature of which is lower than an inside temperature of the first container; and a water supply device that supplies water into the second container, the hydrogen compound member housed in the first container is configured to be movable into the second container, and the hydrogen compound member housed in the second container is configured to be movable into the first container, the hydrogen production system comprising: a first path through which the hydrogen compound member moves from the first container to the second container; a second path through which the hydrogen compound member moves from the second container to the first container; a first heat exchanger that cools the hydrogen compound member moving in the first path; a second heat exchanger that heats the hydrogen compound member moving in the second path; and 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.

3. The hydrogen production system according to claim 2, wherein a replacement section for taking out the hydrogen compound member moving in at least one of the first path or the second path and supplying a new hydrogen compound member different from the taken-out hydrogen compound member to the first path or the second path is provided in the at least one of the first path or the second path.

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

5. The hydrogen production system according to any one of claims 1 to 3, comprising: a gas circulation line through which a gas circulates so that the gas in the first container flows out of the first container and flows into the first container again; and a dust collecting device provided in the gas circulation line that removes a solid component from the gas flowing in the gas circulation line. the hydrogen production system comprising: a recovery line that supplies the solid component removed by the dust collecting device to the hydrogen compound member moving from the second container to the first container.

7. The hydrogen production system according to claim 1, wherein the hydrogen compound member is housed in an inside of a case that plugs both ends of a porous cylindrical member with a lid, the first container and the second container have an inlet and an outlet, the case is provided in the first container so that the lid of the case is fitted on the inlet and the outlet of the first container, respectively, and the cylindrical member is located in an inside of the first container, whereby the hydrogen compound member is housed in the first container, the case is provided in the second container so that the lid of the case is fitted on the inlet and the outlet of the second container, respectively, and the cylindrical member is located in an inside of the second container, whereby the hydrogen compound member is housed in the second container. When an element other than hydrogen is denoted as X, the hydrogen compound component has a structure in which a two-dimensional array of a powder of a hydrogen compound represented by the chemical formula X m H n is supported on a particulate carrier.

2. The hydrogen producing system according to claim 1, wherein ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 6. The hydrogen producing system according to claim 5, wherein ​ ​ ​ ​ ​ ​ ​ The cartridge provided in the first container is movably configured to be provided in the second container, and the cartridge provided in the second container is movably configured to be provided in the first container.

8. The hydrogen producing system according to claim 7, wherein a third container having an inlet and an outlet is provided between the first container and the second container, the cartridge is provided in the third container so as to fit the lid of the cartridge on the inlet and the outlet of the third container, respectively, and the cylindrical member is located inside the third container, whereby the hydrogen compound member is accommodated in the third container, the cartridge provided in the first container is movably configured to be provided in the third container, and the cartridge provided in the third container is movably configured to be provided in the second container, the hydrogen producing system is provided with a first purge line in which a gas in the third container is purged.

9. The hydrogen producing system according to claim 7 or 8, wherein a fourth container having an inlet and an outlet is provided between the second container and the first container, the cartridge is provided in the fourth container so as to fit the lid of the cartridge on the inlet and the outlet of the fourth container, respectively, and the cylindrical member is located inside the fourth container, whereby the hydrogen compound member is accommodated in the fourth container, the cartridge provided in the second container is movably configured to be provided in the fourth container, and the cartridge provided in the fourth container is movably configured to be provided in the first container, the hydrogen producing system is provided with a second purge line in which a gas in the fourth container is purged.

10. The hydrogen producing system according to any one of claims 1 to 3, 7 and 8, wherein, provided with: a gas circulation line in which a gas is circulated so as to flow out of the first container and flow into the first container again; an extraction line that extracts a part of the gas circulated in the gas circulation line; and a first heater that heats water supplied to the second container by the water supply device by heat exchange with the gas flowing in the extraction line.

11. The hydrogen producing system according to any one of claims 1 to 3, 7 and 8, wherein, provided with: a gas circulation line in which a gas is circulated so as to flow out of the first container and flow into the first container again; a heat generating device; and a third heat exchanger that heat-exchanges the gas circulated in the gas circulation line with a fluid that has absorbed heat generated in the heat generating device.

12. The hydrogen producing system according to claim 11, wherein, provided with: a second heater that heats water supplied to the second container by the water supply device by heat exchange with the fluid that has heat-exchanged with the gas in the third heat exchanger.

13. The hydrogen producing system according to any one of claims 1 to 3, 7 and 8, wherein, provided with: a gas circulation line in which a gas is circulated so as to flow out of the first container and flow into the first container again; a sunlight condensing device that condenses sunlight; and a third heat exchanger that heat-exchanges the gas circulated in the gas circulation line with a fluid that has been heated by being irradiated with the sunlight condensed by the sunlight condensing device.

Images