JP6725641B2 - Storage container for solid oxide electrolytic cell stack, hydrogen production system, power storage system - Google Patents

Description

The present invention relates to a container for a solid oxide electrolytic cell stack, a hydrogen production system, and a power storage system.

In recent years, from the perspective of environmental problems such as global warming due to depletion of fossil fuels and release of carbon dioxide into the atmosphere, energy security, etc., the introduction of renewable energy represented by sunlight, wind power, geothermal heat, etc. It is being promoted. Further, as secondary energy, hydrogen energy has attracted attention from the viewpoint of storage and transportation. Currently, the method of reforming fossil fuels is the mainstream of hydrogen production methods from the viewpoint of cost and technology.

In addition, although the introduction of renewable energy has expanded in recent years, there is a problem in that it is difficult to arbitrarily adjust the amount of power generation to meet output stabilization, power demand, etc. due to its characteristics.

Therefore, a method has been studied in which hydrogen is produced by electrolysis (electrolysis) of water using electric energy obtained from renewable energy, this hydrogen is temporarily stored, and when this stored hydrogen is used as fuel, power is generated. ing.

Among the methods for producing hydrogen by electrolysis, there is high-temperature steam electrolysis using a solid oxide electrochemical cell as a highly efficient method. The steam electrolysis is usually carried out by using a group of solid oxide electrochemical cells, which are referred to as a stack or a module, and in which a plurality of cells are bundled and integrated.

JP, 2010-232165, A

The hydrogen production method by high temperature steam electrolysis is a method of producing hydrogen by electrolyzing steam at high temperature (mainly in a temperature range of 500 to 1000° C.) using a solid oxide electrochemical cell. Generally, this solid oxide electrochemical cell is mainly composed of a solid oxide (ceramics), so that it is often disadvantageous in strength as compared with a metal material. Therefore, it is required to prevent hydrogen and oxygen from diffusing into the ambient environment from the solid oxide electrochemical cell or cell stack.

The problem to be solved by the present invention is to promptly oxidize and burn hydrogen in a container containing a solid oxide electrochemical cell stack, so that a safe solid oxide electrolytic cell in which hydrogen does not stay in the container A stack container, a hydrogen production system, and a power storage system are provided.

A container for a solid oxide electrolytic cell stack according to an embodiment of the present invention is characterized in that hydrogen existing in a space between an inner surface of the container and the solid oxide electrolytic cell stack housed in the container is stored inside the container. It is equipped with an oxidant that is oxidized by.

According to the embodiment of the present invention, in a system and a power storage system for producing hydrogen by electrolysis of water, by rapidly oxidizing and burning hydrogen in a container that houses a solid oxide electrochemical cell stack, Since hydrogen does not stay in the container, safety can be improved.

The conceptual diagram which shows the container of the solid oxide electrolysis cell stack by the 1st form of this invention. The conceptual diagram which shows a solid oxide type electrolysis cell. The conceptual diagram which shows the storage container by the 2nd form of this invention. The conceptual diagram which shows the storage container by the 3rd form of this invention. The conceptual diagram which shows the storage container by the 4th form of this invention. The conceptual diagram which shows the storage container by the 5th form of this invention. The conceptual diagram which shows the hydrogen production system and electric power storage system by embodiment of this invention.

<Container for solid oxide electrolytic cell stack>
<< First form >>
FIG. 1 shows a preferred specific example of a container for an oxide electrolytic cell stack according to an embodiment of the present invention.
The storage container 1 of the solid oxide electrolysis cell stack shown in FIG. 1 has hydrogen existing in a space 4 between an inner surface 2 of the container 1 and a solid oxide electrolysis cell stack 3 contained in the container 1. An oxidant supply device 51 for introducing an oxidant 5 for oxidizing the inside of the container 1 into the void 4 is provided.

The solid oxide type electrolysis cell stack 3 uses a solid oxide having ion conductivity as an electrolyte, and a plurality of electrolysis cells composed of the solid oxide electrolyte sandwiched between a hydrogen electrode and an oxygen electrode are stacked. It will be. As shown in FIG. 2, one electrolysis cell 30 is configured by sandwiching an electrolyte 31 made of a solid oxide between a hydrogen electrode 32 and an oxygen electrode 33, and water (H ₂ O) is provided on the hydrogen electrode 32 side. ) Is usually supplied in the form of water vapor, and hydrogen is produced by the reaction of H ₂ O+2e ⁻ →H ₂ +O ^{2 −} at the hydrogen electrode 32, while O ² → →1/2O ₂ +2e ^{− at the} oxygen electrode 33. As a result of the generation of oxygen by the reaction, the water supplied to the electrolysis cell 30 is electrolyzed into hydrogen and oxygen.

The solid oxide electrolytic cell stack 3 can be formed by stacking a plurality of the electrolytic cells 30 (single cells). In addition, a separator (not shown) is further arranged between the individual cells as necessary.

One accommodating container 1 can accommodate one or a plurality of solid oxide electrolytic cell stacks 3.

The oxide electrolysis cell stack 3 according to the embodiment shown in FIG. 1 includes a fuel supply pipe 6 for supplying water (water vapor), a hydrogen outflow pipe 7 for outflowing hydrogen generated in the cell stack 3, and, as the case may be, An oxygen outflow pipe (not shown) for outflowing oxygen from the cell stack 3 is connected. Further, a power supply line (not shown) for supplying power for electrolyzing water is connected to the cell stack 3.

The container 1 of the solid oxide electrolytic cell stack is provided with a heater (not shown) for heating the cell stack 3 housed in the container 1. The container 1 is preferably made of a heat insulating material.

If there is a leaked substance (for example, hydrogen, oxygen, or water vapor) from the cell stack 3, it will leak into the void 4.

In the container 1 of the solid oxide electrolysis cell stack, the oxidant 5 that oxidizes hydrogen existing in the voids 4 inside the container 1 is specifically a fluid oxidant. Since this oxidant is "a substance that aids in the combustion of combustible substances (especially hydrogen)", it may be referred to as "flammable material" in the present specification (the hydrogen gas is Exclude from "flammable materials").

The above “flammability supporting material” preferably has a higher oxidizing power than air, but this is not essential, and the oxidizing power may be lower than air. Further, the “fluid” means a substance or mixture having fluidity under the temperature and pressure conditions when being introduced into the container 1. In particular, a gas is preferable.

In the embodiment of the present invention, particularly preferable examples of the fluid combustion-supporting material include oxygen gas and oxygen-containing gas (for example, air).

Then, it is preferable that the material of the combustion-supporting material introduced into the container 1 has a high temperature. As a result, it is possible to suppress the temperature decrease inside the container 1 due to the introduction of the combustion supporting material.

In the embodiment of the present invention, it is preferable to burn the hydrogen leaked into the void 4 as quickly and surely as possible. From this point of view, it is preferable that the amount of the combustion-supporting substance be greater than or equal to the amount required for burning the leaked hydrogen in the void 4 of the storage container 1. Therefore, it is preferable to supply the combustion-supporting substance to the voids 4 at least during the operation of the cell stack 3 (that is, while electrolysis is being performed in the cell stack 3). Then, even when the cell stack 3 is stopped, it is preferable to supply the combustion-supporting substance to the gap 4 in order to quickly burn the leaked hydrogen.

As described above, according to the container 1 of the oxide-type electrolytic cell stack according to the first embodiment, the hydrogen leaked from the solid oxide-type electrolytic cell stack 3 to the void 4 can be promptly changed by the extremely simple oxidizing device 5. It can be burned reliably and gently. This is because when a very small amount of hydrogen leaks, it diffuses into the surrounding rich abundant combustion-supporting substances, so that a so-called diffusion combustion occurs stably, and by maintaining it, it is possible to maintain a calm atmosphere. It is speculated that this is due to the achievement of slow combustion. As a result, the retention of hydrogen in the void 4 of the storage container 1 is suppressed, so that the safety of the hydrogen production system and the power storage system can be improved.

<< Second form >>
FIG. 3 shows a preferred specific example of a container for an oxide electrolytic cell stack according to an embodiment of the present invention.
The storage container 1 of the solid oxide electrolysis cell stack shown in FIG. 3 has hydrogen existing in the space 4 between the inner surface 2 of the container 1 and the solid oxide electrolysis cell stack 3 contained in the container 1. Is provided inside the container 1, and the oxidant is a solid oxidant 52 disposed in the void 4.

The container 1 of the solid oxide electrolytic cell stack shown in FIG. 3 uses the “solid oxidant 52 ”and is not provided with the oxidant supply device 51 in FIG. 1. It is the same as the storage container 1 shown. Therefore, except for the solid oxidizer 52, the same ones as described above can be used for the first embodiment. This oxidant is also "a substance that helps the combustion of combustible substances (especially hydrogen)."

In the embodiment of the present invention, the solid combustion-supporting material is not particularly limited as long as it can oxidize hydrogen, but an oxide is preferable. Particularly preferable examples include iron oxide, nickel oxide, and solid materials containing these.

Such a solid oxidant 52 can be arranged in the void 4 so as to come into contact with hydrogen existing in the void 4 in the form of particles or powder, or in any shape, or in the form of a molded product. .. For example, the inner surface 2 of the container 1 (for example, the wall surface, the floor surface, or the ceiling surface of the container) or the outer wall surface of the cell stack 3 may be attached or coated, or the container 1 may be filled with particles or powder. it can.

In the embodiment of the present invention, it is preferable to oxidize hydrogen existing in the voids 4 quickly and reliably. From this point of view, it is preferable that in the void 4 of the container 1, oxygen is present in the container 1 in an amount equal to or more than the amount necessary for oxidizing the leaked hydrogen.

In the second mode as described above, the leaked hydrogen can be discharged not only during the operation of the cell stack 3 (that is, during the period when electrolysis is performed in the cell stack 3) but also during the operation stop of the cell stack 3. Oxidation can be performed.

The temperature sensor 8 may be arranged on the solid combustion-supporting substance 52. In such an embodiment, the temperature sensor 8 detects the temperature change due to the reaction of the solid combustion-supporting substance with hydrogen, so that the presence or absence of leakage of hydrogen from the electrolysis cell stack 3 and/or hydrogen is immediately detected. It becomes possible to accurately determine the leakage amount of the.

According to the container 1 of the oxide type electrolysis cell stack according to the second embodiment described above, the hydrogen leaked from the solid oxide type electrolysis cell stack 3 into the void 4 can be swiftly and reliably stored by the extremely simple oxidation device. It can be gently oxidized. As a result, the retention of hydrogen in the void 4 of the storage container 1 is suppressed, so that the safety of the hydrogen production system and the power storage system can be improved.

<< Third form >>
FIG. 4 shows a preferred specific example of a container for an oxide electrolytic cell stack according to an embodiment of the present invention.
The container 1 of the solid oxide electrolysis cell stack shown in FIG. 4 is the solid oxide shown in FIG. 1 except that the combustion catalyst 53 for burning the hydrogen existing in the void 4 is installed in the void 4. It has the same contents as the container 1 of the shaped electrolytic cell stack. Therefore, except for the combustion catalyst 53, the same one as described above with respect to the first embodiment can be used.

In the embodiment of the present invention, the combustion catalyst 53 is not particularly limited in material, shape, installation location, or the like. As for the material, a material containing a noble metal component such as Pt or Ru is desirable. The shape may be a particle shape, a cylindrical shape, a honeycomb shape, or the like, but is not particularly limited. The installation location is also not particularly limited, and examples thereof include the vicinity of the inlet of the combustion-supporting gas pipe 51 and the outer wall surface of the cell stack 3. As a result, the leaked hydrogen instantly burns and reacts, and it is possible to prevent the hydrogen from staying inside the container 1.

According to the container 1 for an oxide electrolytic cell stack according to the third aspect of the present invention described above, the effects obtained in the first aspect described above can be achieved more highly and reliably.

<< Fourth Form >>
FIG. 5 shows a preferred specific example of a container for an oxide electrolytic cell stack according to an embodiment of the present invention.
The storage container 1 of the solid oxide electrolysis cell stack shown in FIG. 5 has hydrogen existing in the space 4 between the inner surface 2 of the container 1 and the solid oxide electrolysis cell stack 3 contained in the container 1. In the container 1 of the first embodiment shown in FIG. 1, further comprising an oxidant for oxidizing the inside of the container 1,
(1) A temperature sensor 9, which measures the temperature of the solid oxide electrolytic cell stack 3,
(2) Hydrogen concentration sensor 10 for measuring the concentration of hydrogen existing in the void 4,
(3) Oxygen concentration sensor 11, which measures the concentration of oxygen existing in the void 4,
(4) (a) Temperature of the solid oxide electrolytic cell stack 3 obtained from the temperature sensor 9, (b) Concentration of hydrogen existing in the voids 4 obtained from the hydrogen concentration sensor 10, (c) From oxygen concentration sensor 11 The presence or absence of hydrogen leakage from the solid oxide electrolytic cell stack 3 and/or the amount of hydrogen leakage is determined based on one or two or more selected from the concentration of oxygen existing in the obtained voids 4. Determination device 12,
(5) A control device 13 for adjusting the amount of the combustion-supporting substance introduced into the solid oxide electrolytic cell storage container 3 based on the determination by the determination device 12.
1 shows a container 1 for a solid oxide electrolytic cell stack further including the above.

The solid oxide electrolytic cell stack 3 and the oxidant supply device 51 shown in FIG. 5 may be the same as those described above with respect to the first embodiment.

The temperature sensor 9, the hydrogen concentration sensor 10, the oxygen concentration sensor 11, and the determination device 12 do not always have to be provided in the storage container 1 at the same time, and can be provided as needed.

Preferably, for example, in the determination device 12, according to the data used when determining the presence or absence of hydrogen leakage from the cell stack 3 and/or the amount of hydrogen leakage, a sensor or device necessary for acquiring the data. Etc. can be provided. That is, for example, when the determination device 12 is provided, when the determination device 12 determines the presence/absence of hydrogen leakage and/or the amount of hydrogen leakage based only on the temperature data of the cell stack 3, at least the temperature sensor 9 is used. However, it is not necessary to further include the hydrogen concentration sensor 10, the oxygen concentration sensor 12, other devices, and the like in addition to them.

The storage container 1 may be provided with different types of sensors or devices, or may be provided with a plurality of the same types of sensors or devices.

The temperature sensor 9, the hydrogen concentration sensor 10, the oxygen concentration sensor 11, the determination device 12, and the control device 13 are not particularly limited in their installation locations. For example, various sensors (9, 10, 11) and the container 1 It is possible to appropriately select an optimum installation position in consideration of specific contents, types, objects to be measured, accuracy of measurement results, stability, reliability, and the like. Preferably, for example, the hydrogen concentration sensor 10 is provided at or near a location where the concentration of leaked hydrogen quickly increases (for example, preferably, the surface of the cell stack 3, the vicinity thereof, or the ceiling inside the container 1). For example, the oxygen concentration sensor 11 can be provided at a place where the oxygen concentration tends to be low, or at a place where the average oxygen concentration is inside the container 1.

Generally, the temperature sensor 9, the hydrogen concentration sensor 10, the oxygen concentration sensor 11 and the like are preferably installed inside the housing container 1, but the gas state of the gap 4 can be detected with a required accuracy or at a level that does not hinder. In that case, the desired measurement data can be obtained by installing the gas in the gap 4 and installing it outside the housing container 1.

In the determination device 12, any one selected from (a) temperature of the solid oxide electrolytic cell stack 3, (b) concentration of hydrogen present in the void 4, and (c) concentration of oxygen present in the void 4 Alternatively, the presence or absence of leakage of hydrogen from the solid oxide electrolytic cell stack 3 and/or the amount of leakage of hydrogen can be determined based on two or more. Among these, it is preferable to determine the presence/absence of hydrogen leakage and/or the amount of hydrogen leakage from the “concentration of hydrogen existing in the void 4” in (b).

The control device 13 is a control device that adjusts the amount of the combustion-supporting substance introduced into the solid oxide electrolytic cell storage container 3 based on the determination by the determination device 12. Preferred examples of the control device 13 include a feed pump for the combustion supporting substance, a control valve for controlling the amount of the combustion supporting substance supplied, and the like. Only one of the supply pump and the control valve can be provided, or both of them can be provided.

According to the container 1 for an oxide-type electrolysis cell stack according to the fourth aspect of the present invention described above, hydrogen leaked from the solid oxide-type electrolysis cell stack 3 into the void 4 can be swiftly discharged by an extremely simple oxidation device. In addition, it can be reliably and gently oxidized. As a result, the leaked hydrogen instantly burns and reacts, and it is possible to prevent the hydrogen from staying inside the container 1.

Then, according to the container 1 of the oxide electrolysis cell stack according to the fourth aspect of the present invention which further includes various sensors, a determination device, a control device, etc., as necessary, the presence or absence of hydrogen leakage and (or ) It is possible to judge the leakage amount of hydrogen. Then, based on this, the supply amount of the combustion supporting substance can be controlled. As a result, it is possible to effectively reduce the amount of the combustion-supporting substance introduced into the container 1 and effectively prevent the temperature inside the container 1 from decreasing.

<<< Another specific example of the fourth form >>>
The oxide-type electrolytic cell stack housing container 1 according to the fourth embodiment described above can further include a combustion catalyst 53 and a temperature sensor 14 that measures the temperature of the combustion catalyst 53, if necessary. The combustion catalyst 53 may be the same as that described above with respect to the third embodiment.

As described above, as the determination device 12 when the storage container 1 further includes the combustion catalyst 53, (a) the temperature of the solid oxide electrolytic cell stack 3 obtained from the temperature sensor 9, and (b) the hydrogen concentration sensor 10 From the concentration of hydrogen present in the void 4 obtained from (c) the concentration of oxygen present in the void 4 obtained from the oxygen concentration sensor 11, and (d) the temperature of the combustion catalyst 53 obtained from the temperature sensor 14. A determination device 12 for determining the presence/absence of leakage of hydrogen from the solid oxide electrolytic cell stack 3 and/or the amount of leakage of hydrogen based on one or two or more may be used.

According to the container 1 for an oxide-type electrolysis cell stack according to the fourth aspect of the present invention described above, hydrogen leaked from the solid oxide-type electrolysis cell stack 3 into the void 4 can be swiftly discharged by an extremely simple oxidation device. In addition, it can be reliably and gently oxidized. As a result, the leaked hydrogen burns and reacts instantly, and it is possible to prevent the hydrogen from staying inside the container 1, and it is possible to improve the safety of the hydrogen production system and the power storage system.

Then, according to the container 1 of the oxide electrolysis cell stack according to the fourth aspect of the present invention which further includes various sensors, a determination device, a control device, etc., as necessary, the presence or absence of hydrogen leakage and (or ) It is possible to judge the leakage amount of hydrogen and control the supply amount of the combustion-supporting substance. As a result, it is possible to effectively reduce the amount of the combustion-supporting substance introduced into the container 1 and effectively prevent the temperature inside the container 1 from decreasing.

<< Fifth form >>
FIG. 6 shows a preferred specific example of a container for an oxide electrolytic cell stack according to an embodiment of the present invention.
The storage container 1 of the solid oxide electrolytic cell stack shown in FIG. 6 is specifically the storage container 1 of the first embodiment shown in FIG.
(6) Flow sensor 15 for measuring the amount of water flowing into the solid oxide electrolytic cell stack 3, flow sensor 16 for measuring the amount of hydrogen flowing out from the outlet of the solid oxide electrolytic cell stack 3, flow sensor A determination device 17 for determining the presence/absence of leakage of hydrogen from the solid oxide electrolytic cell stack 3 and/or the amount of leakage of hydrogen based on the calculation of data acquired from the flow sensor 15 and the flow sensor 16.
(7) A solid oxide electrolysis cell further comprising a control device 13 for adjusting the amount of the combustion-supporting substance introduced into the solid oxide electrolysis cell accommodating container 3 based on the judgment by the judgment device 17. 1 shows a container 1 of a stack.
The solid oxide electrolytic cell stack 3 and the oxidant supply device 51 shown in FIG. 6 may be the same as those described above with respect to the first embodiment.

In the determination device 17, the amount of water flowing into the solid oxide electrolysis cell stack obtained from the flow rate sensor 15 and the amount of hydrogen flowing out from the outlet of the solid oxide electrolysis cell stack obtained from the flow rate sensor 16. The presence or absence of leakage of hydrogen from the solid oxide electrolysis cell stack 3 and/or the amount of leakage of hydrogen are determined based on the calculation of the respective data. That is, in the determination device 17, hydrogen leakage from the cell stack 3 occurs from the material balance of the raw material (that is, water) supplied to the cell stack 3 and the product (that is, hydrogen and oxygen) that is a decomposition product of water. The presence or absence and/or the amount of hydrogen leakage is determined. Here, the "water flowing into the solid oxide electrolysis cell stack" is usually water in the form of water vapor or a mixture of water in the form of water vapor and water in the liquid state (water droplets).

When determining the presence/absence of hydrogen leakage from the solid oxide electrolytic cell stack 3 and/or the amount of hydrogen leakage, for example, based on the data acquired from the flow rate sensor 15 and the flow rate sensor 16, for example, the container 1 It can be appropriately performed in consideration of the specific contents and the operating condition of electrolysis performed in the cell stack 3 and the like, taking into consideration condition parameters and the like appropriately determined as necessary.

The control device 13 is a control device that adjusts the amount of the combustion-supporting substance introduced into the solid oxide electrolytic cell storage container 3 based on the determination by the determination device 17. Preferred examples of the control device 13 include a feed pump for the combustion supporting substance, a control valve for controlling the amount of the combustion supporting substance supplied, and the like. Only one of the supply pump and the control valve can be provided, or both of them can be provided.

<<< Another specific example of the fifth mode >>>
The above-mentioned oxide type electrolytic cell stack housing container 1 according to the fifth embodiment of the present invention further includes, as necessary, a combustion catalyst 53 and a temperature sensor 14 for measuring the temperature of the combustion catalyst 53. You can The combustion catalyst 53 may be the same as that described above with respect to the third embodiment.

Further, the oxide-type electrolytic cell stack container 1 according to the fifth embodiment of the present invention further includes a determination device 17, a determination device 12 and a sensor described in the fourth embodiment in addition to the determination device 17. can do.

According to the container 1 of the oxide type electrolytic cell stack according to the fifth aspect of the present invention described above, the hydrogen leaked from the solid oxide type electrolytic cell stack 3 into the void 4 can be more promptly discharged by the extremely simple oxidizing device. In addition, it can be reliably and gently oxidized.

Then, according to the container 1 of the oxide electrolysis cell stack according to the fifth embodiment of the present invention which further includes various sensors, a determination device, a control device, etc., as necessary, the presence or absence of hydrogen leakage and (or ) It is possible to judge the leakage amount of hydrogen and control the supply amount of the combustion-supporting substance. As a result, it is possible to effectively reduce the amount of the combustion-supporting substance introduced into the container 1 and effectively prevent the temperature inside the container 1 from decreasing.

<Hydrogen production system and power storage system>
FIG. 7 is a conceptual diagram of a hydrogen production system and a power storage system.
As shown in FIG. 7, the hydrogen production system uses a power generation unit (or an electric energy supply source) A and electric power generated by the power generation unit A to decompose water into hydrogen and oxygen to produce hydrogen. And a disassembling section B. Further, the power storage system includes a power generation unit (or an electric energy supply source) A, an electrolysis unit B that decomposes water into hydrogen and oxygen to produce hydrogen by using electric power from the power generation unit A, and electrolysis. The storage unit C includes a storage unit C that stores the hydrogen produced in the unit B and a power generation unit D that uses the stored hydrogen as a fuel to generate electric power. The oxygen generated in the electrolysis section B can be stored in the storage section E as necessary, and the oxygen can also be used as a fluid-like combustion supporting substance.

The hydrogen production system is a hydrogen production system comprising an electrolysis section B including a solid oxide electrolysis cell stack that produces hydrogen by electrolysis of water, wherein the solid oxide electrolysis cell stack comprises: It is stored in a storage container.

The electric power storage system includes an electrolysis unit B including a solid oxide electrolytic cell stack that produces hydrogen by electrolysis of water, a storage unit C that stores hydrogen produced by the electrolysis unit B, and a storage unit. In the power storage system, the solid oxide electrolytic cell stack is housed in a housing container.

Here, preferable specific examples of the container include those described in the first to fifth forms.

In the hydrogen production system and the electric power storage system according to the embodiment of the present invention, since the retention of hydrogen in the voids of the storage container is suppressed, the safety of the hydrogen production system and the electric power storage system can be improved.

Although some embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modified examples are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalent scope thereof.

1: container, 3: solid oxide electrolytic cell stack, 30: electrolytic cell, 31: solid oxide electrolyte, 32: hydrogen electrode, 33: oxygen electrode, 4: void, 51: supply of fluid oxidant Device, 52: Solid oxidizer, 53: Combustion catalyst, 6: Fuel supply pipe, 7: Hydrogen outflow pipe, 8: Temperature sensor, 9: Temperature sensor, 10: Hydrogen concentration sensor, 11: Oxygen concentration sensor, 12 : Determination device, 13: control device, 14: temperature sensor, 15: flow rate sensor, 16: flow rate sensor, 17: determination device, A: power generation unit, B: electrolysis unit, C: hydrogen storage unit, D: power generation unit , E: Oxygen storage

Claims (9)

A container for a solid oxide electrolytic cell stack,
Housing of a solid oxide electrolytic cell stack, comprising an oxidant that oxidizes hydrogen present in the void between the inner surface of the container and the solid oxide electrolytic cell stack housed in the container inside the container. container. The storage container according to claim 1, wherein the storage container further comprises an oxidant supply device that introduces the fluid oxidant into the void. The container according to claim 1, wherein the oxidant is a solid oxidant arranged in the void. The container according to claim 2, further comprising a combustion catalyst installed in the space for burning hydrogen. Any one selected from the temperature of the solid oxide electrolytic cell stack, the concentration of hydrogen existing in the void, the concentration of oxygen existing in the void, the temperature of the solid combustion-supporting substance, and the temperature of the combustion catalyst. The method according to any one of claims 1 to 4, further comprising a determination device for determining at least one of the presence or absence of leakage of hydrogen from the solid oxide electrolytic cell stack and the amount of leakage of hydrogen based on one or two or more. The container according to any one of 1. The amount of water flowing into the solid oxide electrolysis cell stack and the amount of hydrogen flowing out of the outlet of the solid oxide electrolysis cell stack, based on the calculation of the respective data, the solid oxide The container according to any one of claims 1 to 5, further comprising a determination device that determines at least one of the presence/absence of leakage of hydrogen from the shaped electrolytic cell stack and the leakage amount of hydrogen. The control device for adjusting the amount of the combustion-supporting substance introduced into the solid oxide electrolytic cell storage container based on the determination by the determination device, further comprising: The storage container described. A hydrogen production system comprising an electrolysis section comprising a solid oxide electrolytic cell stack for producing hydrogen by electrolysis of water,
A hydrogen production system in which the solid oxide electrolytic cell stack is housed in the housing container according to any one of claims 1 to 7. An electrolysis section including a solid oxide electrolysis cell stack that produces hydrogen by electrolysis of water, a storage section that stores the hydrogen produced in the electrolysis section, and power generation using the stored hydrogen as fuel A power storage system comprising a power generation unit,
A power storage system in which the solid oxide electrolytic cell stack is housed in the housing container according to any one of claims 1 to 7.

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