JP4630837B2 - High temperature steam electrolysis apparatus and electrolysis method thereof - Google Patents

Description

  The present invention relates to a high-temperature steam electrolysis apparatus using a cylindrical steam electrolysis cell and an electrolysis method thereof.

  As this type of high temperature steam electrolysis method, a technique is known in which hydrogen and oxygen are obtained by electrolyzing water vapor at an operating temperature of about 600 to 900 ° C. (see, for example, Patent Document 1). The principle of operation uses the reverse reaction of a solid oxide fuel cell (SOFC).

  In order to perform this high-temperature steam electrolysis, an electrochemical cell in which a hydrogen electrode and an oxygen electrode are provided with a solid oxide electrolyte material in between is generally used. A structure for separating hydrogen and oxygen obtained by electrolysis of the electrochemical cell is required. Normally, the hydrogen electrode side atmosphere is mainly composed of water vapor and hydrogen as fuel, while the oxygen electrode side atmosphere is mainly composed of nitrogen and oxygen when the supply gas is air, and the supply gas is oxygen. When it does, oxygen becomes the main component. In this way, the types of gas supplied to both electrodes are completely different, and a gas supply mechanism is required for each electrode, which complicates this configuration.

  The electrochemical cell structure includes a flat plate type and a cylindrical type. The hydrogen electrode side atmosphere and the oxygen electrode side atmosphere of the electrochemical cell are separated by a dense structure of a solid oxide electrolyte, which is a constituent part of the electrochemical cell, and a gas seal at the end of the cell. By separating in this way, the atmosphere gas leakage between the hydrogen electrode side atmosphere and the oxygen electrode side atmosphere is minimized. If the electrochemical cell is used alone, gas sealing at the cell edge is relatively easy. However, when these are stacked and used as an aggregate, it is considered that the gas seal reliability at the end of the cell is lowered.

  In putting this high-temperature steam electrolysis method into practical use, it has a structure that supplies the electrolysis current uniformly and stably over a long period of time in an oxidizing / reducing atmosphere to the gas seal separating the hydrogen and oxygen and the electrode of the electrolysis cell. Has been focused.

  This conventional high-temperature steam electrolysis apparatus will be described with reference to FIGS. FIG. 3 is a longitudinal sectional view showing a schematic configuration of a conventional high-temperature steam electrolysis apparatus, and FIG. 4 is a longitudinal sectional view showing a schematic structure of a current lead portion in FIG.

  In FIG. 3, the water vapor electrolysis apparatus includes a cylindrical electrolysis cell 101 and a module housing 110 that houses the electrolysis cell 101. The module housing 110 is divided into a water vapor supply chamber 102 for supplying water vapor, a generated hydrogen discharge chamber 103 for discharging generated hydrogen, and an oxygen generation chamber 105 for generating oxygen. The water vapor from the water vapor supply chamber 102 is supplied into the electrolysis cell 101 via the water vapor injection pipe 104.

  As shown in FIG. 4, a current lead metal cap 106 is attached to one end of a cylindrical electrolytic cell 101, and a seal cap 107 is attached to the other end to form a closed structure. The supply and discharge of fuel in the electrolysis cell 101 can be performed only from one side. In addition, the electrolytic cell 101 is supported by the taper-type seal portion 108 with the tube plate 111, so that the electrolytic cell 101 can be attached and detached, and can be gas-sealed.

The current lead will be described. The lead portion on the hydrogen electrode side is taken out via the taper type sealing 108. The lead portion on the oxygen electrode side is introduced into the inside of the electrolysis cell 101 via the seal cap 107 via the cell lead portion 112 at the lower end of the electrolysis cell 101, and is taken out from the current lead metal cap 106 through the reducing atmosphere. .
Japanese Patent No. 2930326

  The above-described conventional high-temperature steam electrolysis apparatus electrolyzes high-temperature steam to obtain hydrogen gas and oxygen gas, and its operation principle uses the reverse reaction of a solid electrolyte fuel cell.

  However, the gas seal portion between the hydrogen electrode side atmosphere and the oxygen electrode side atmosphere is required at two places above and below the electrolysis cell 101, and the gas seal portion includes a cell lead portion in any case. Therefore, there has been a problem that it is difficult to realize a reliable and reliable seal.

  In addition, there is a problem that it is difficult to supply an electrolytic current uniformly and stably over a long period of time to an electrode of an electrolytic cell under high temperature and in an oxidizing / reducing atmosphere.

  In addition, the cylindrical steam electrolysis cell may be damaged due to mechanical shocks during assembly or thermal deformation of components at high temperatures, causing the cylindrical steam electrolysis cells to contact each other or to contact peripheral members. There was a problem of being.

  The present invention has been made in order to solve the above-mentioned problems. Steam electrolysis is stably performed at a high temperature and in an oxidizing / reducing atmosphere for a long period of time while preventing gas leakage between hydrogen and oxygen with a simple structure and preventing cell damage. It is an object of the present invention to provide a high-temperature steam electrolysis apparatus that performs a reaction and an electrolysis method thereof.

In order to achieve the above object, in the high-temperature steam electrolysis apparatus of the present invention, a hydrogen electrode that is closed at one end to form a cylindrical inner side, a cylindrical oxygen electrode provided outside the hydrogen electrode, and the hydrogen electrode At least one cylindrical steam electrolysis cell having an electronic insulating property and an oxygen ion conductivity provided between the electrode and the oxygen electrode, and supplying water vapor to the hydrogen electrode of the cylindrical steam electrolysis cell A water vapor supply chamber, a water vapor supply pipe for supplying the water vapor in the water vapor supply chamber to the inside of the cylindrical water vapor electrolysis cell, and for taking out hydrogen generated at the hydrogen electrode adjacent to the water vapor supply chamber out of the system An electrolytic current is supplied to the inside and outside of the generated hydrogen discharge chamber, the oxygen generating chamber for taking out oxygen generated on the oxygen electrode side adjacent to the generated hydrogen discharge chamber, and the cylindrical steam electrolysis cell. And an elastic power supply terminal to be fixed, and to provide conductivity to the wall surfaces of the water vapor supply chamber and the oxygen generation chamber, and to provide the water vapor supply by providing an insulating layer between the water vapor supply chamber and the oxygen generation chamber. A partition wall having an electrolytic current supply means for supplying an electrolytic current to the hydrogen electrode and the oxygen electrode of the cylindrical steam electrolysis cell through the wall surfaces of the chamber and the oxygen generation chamber, and separating the generated hydrogen discharge chamber and the oxygen generation chamber and the said cylindrical steam electrolysis cell, to structurally and electrically indirectly joined through a support tube having a thermal expansion coefficient equivalent to that of the cylindrical steam electrolytic cell, and is characterized in.

In order to achieve the above object, in the high-temperature steam electrolysis apparatus of the present invention, an oxygen electrode which is closed at one end to form a cylindrical inner side, a cylindrical hydrogen electrode provided outside the oxygen electrode, At least one cylindrical steam electrolysis cell provided between an oxygen electrode and a hydrogen electrode and having an electronic insulating property and an oxygen ion conductivity, and adjusting an oxygen electrode atmosphere of the cylindrical steam electrolysis cell An oxygen electrode atmosphere supply chamber, an oxygen electrode atmosphere supply pipe for supplying the oxygen electrode atmosphere in the oxygen electrode atmosphere supply chamber to the inside of the cylindrical steam electrolysis cell, and an oxygen electrode atmosphere supply chamber adjacent to the oxygen electrode atmosphere supply chamber. A generated oxygen discharge chamber for extracting generated oxygen out of the system, a hydrogen generation chamber for extracting hydrogen generated on the hydrogen electrode side adjacent to the generated oxygen discharge chamber, and the cylindrical water vapor Electrolytic cell An elastic power supply terminal for supplying and fixing an electrolytic current to the inside and the outside of the battery, and providing conductivity to the walls of the oxygen atmosphere supply chamber and the hydrogen generation chamber, and the oxygen atmosphere supply chamber and the hydrogen generation chamber. Provided with an electrolysis current supply means for providing an electrolysis current to the oxygen electrode and the hydrogen electrode of the cylindrical steam electrolysis cell through the wall surfaces of the oxygen atmosphere supply chamber and the hydrogen generation chamber, and the partition wall isolating the generation oxygen discharge chamber and the hydrogen generation chamber the cylindrical steam electrolysis cell, structurally and electrically indirectly via a support tube having a thermal expansion coefficient equivalent to that of the cylindrical steam electrolytic cell It is characterized by joining to.

  According to the high-temperature steam electrolysis apparatus and the electrolysis method of the present invention, the inner pole of the cylindrical steam electrolysis cell is maintained in a sealed state from the container wall surface, and the outer electrode is insulated from another insulated container wall surface. By flowing an electrolysis current through the power supply terminal, gas leakage between hydrogen and oxygen can be prevented with a simple structure, and the electrolysis current can be stably and stably applied to the cell electrode over a long period of time under high temperature and in an oxidizing / reducing atmosphere. Can be supplied.

  Embodiments of a high-temperature steam electrolysis apparatus and an electrolysis method thereof according to the present invention will be described below with reference to the drawings. Here, the same or similar parts are denoted by common reference numerals, and redundant description is omitted.

  FIG. 1 is a longitudinal sectional view showing a schematic configuration of a high-temperature steam electrolysis apparatus according to a first embodiment of the present invention.

  As shown in this figure, the water vapor electrolysis apparatus has at least one cylindrical water vapor electrolysis cell 1 and a container 40 for storing the cylindrical water vapor electrolysis cell 1.

  The cylindrical steam electrolysis cell 1 is composed of a cylindrical cell having one end closed and the other end open. The inside of this cell is formed from the hydrogen electrode 21. The outside of the cell is formed from the oxygen electrode 31. An electrolyte layer 45 having electronic insulation and oxygen ion conductivity is interposed between the hydrogen electrode 21 and the oxygen electrode 31.

  On the other hand, a steam supply chamber 2 for supplying steam 41 to the hydrogen electrode 21 of the cylindrical steam electrolysis cell 1 is provided at the lower part of the container 40. The water vapor 41 in the water vapor supply chamber 2 is introduced into the cylindrical water vapor electrolysis cell 1 through the water vapor supply pipe 3. A generated hydrogen discharge chamber 4 for taking out hydrogen 42 generated in the hydrogen electrode 21 out of the system is provided in the middle portion of the vessel 40 adjacent to the water vapor supply chamber 2. In addition, an oxygen generation chamber 5 for taking out oxygen 43 generated by introducing an oxygen electrode atmosphere 47 on the oxygen electrode 31 side of the cylindrical steam electrolysis cell 1 while adjusting the oxygen electrode atmosphere 47 is provided at the upper part of the container 40. ing. A partition wall 6 is provided between the generated hydrogen discharge chamber 4 and the oxygen generation chamber 5.

  The partition wall 6 and the cylindrical steam electrolysis cell 1a may be directly joined structurally and electrically as shown on the left side of the figure. Moreover, as shown on the right side of this figure, you may join structurally and electrically indirectly through the support tube 7 which has a thermal expansion coefficient equivalent to the cylindrical water-vapor-electrolysis cell 1b. However, in any case, the gas inside and outside the cell does not leak to each other at the junction, the oxygen electrode 31 and the partition wall 6 of the cylindrical steam electrolysis cell 1 are electrically insulated, and When the support tube 7 is used, it is necessary that the inside and outside of the support tube 7 are insulated.

  In addition, an insulating layer 8 is provided to electrically insulate at least a part of the wall surface of the oxygen generation chamber 5 from the partition walls 6 of the generated hydrogen discharge chamber 4 and the oxygen generation chamber 5. By providing this insulating layer 8, an electrolytic current can be passed through both electrodes of the cylindrical steam electrolysis cell 1 with a simple reaction vessel structure.

In addition, the hydrogen electrode 21 inside the cylindrical steam electrolysis cell 1 is in contact with the steam supply pipe 3 inserted into the cylindrical steam electrolysis cell 1 through the elastic power supply terminal 22. Further, the oxygen electrode 31 outside the cylindrical steam electrolysis cell 1 is in contact with the guide plate 10 via the elastic power supply terminal 32. The elastic feeding terminal 22 and the resilient feed terminal 32 is, for example, platinum, silver or nickel or the like is used which is processed into a spring-like. In addition to the spring-like structure, the above-described material processed into a mesh or felt shape may be used.

  Further, the elastic power supply terminal 22 does not hinder the relative position change between the cylindrical steam electrolysis cell 1 and the steam supply pipe 3 due to the flow of steam gas inside the cylindrical steam electrolysis cell 1 and the temperature change. Gaps may be provided radially from the center of the cylindrical steam electrolysis cell.

  Further, by using the water vapor introduction pipe 3 as a conductive material, electrical contact is secured to the hydrogen electrode 21 of the cylindrical water vapor electrolysis cell 1 through two current supply paths of the partition wall 6 and the water vapor supply pipe 3. At the same time, the cylindrical steam electrolysis cell 1 is fixed at two points, that is, the tip portion and the root portion, so that the stability can be improved structurally.

  Further, by replacing a part of the water vapor supply pipe 3 connected to the partition wall 44 between the water vapor supply chamber 2 and the generated hydrogen discharge chamber 4 with an elastic structure 9 having elasticity, a cylinder due to material deformation or the like at the time of assembly or at a high temperature. The type steam electrolysis cell 1 can be effectively prevented from being damaged. The elastic structure 9 can be formed of a metal tube processed by bellows, a metal tube bent by a spiral, or the like.

  Furthermore, the side surface of the cylindrical steam electrolysis cell 1 can be supported by the guide plate 10 provided on the wall surface of the oxygen generation chamber 5 insulated from the partition wall 6 by the insulating layer 8. By providing this guide plate 10, the oxygen electrode 31 on the side surface of the cylindrical steam electrolysis cell 1 can be brought into mechanical and electrical contact via the elastic power supply terminal 32. As the elastic power supply terminal 32, for example, platinum, silver, or oxidation-resistant metal processed into a spring shape can be used. In addition to the spring-like structure, the material processed into a mesh or felt may be used. With these structures, the position of the cylindrical steam electrolysis cell 1 is fixed from the outside to prevent mechanical shock / breakage due to contact with the members outside the cylindrical steam electrolysis cell 1, and the electrical property on the oxygen electrode 31 side is prevented. Contact can be ensured.

  According to the present embodiment, the hydrogen electrode 21 maintains a sealing function from the vessel wall surface, and the oxygen electrode 31 is another wall surface insulated from the vessel wall surface electrically connected to the hydrogen electrode 21. By flowing an electrolysis current from through the power supply terminal, gas leakage between hydrogen and oxygen can be prevented with a simple structure. In addition, the electrolytic current can be supplied to the cell electrode uniformly and stably over a long period of time at a high temperature and in an oxidizing / reducing atmosphere. Furthermore, high temperature steam electrolysis can be performed efficiently and stably while preventing damage to the cell due to material deformation or the like at the time of assembly or at a high temperature.

  FIG. 2 is a longitudinal sectional view showing a schematic configuration of the high temperature steam electrolyzer according to the second embodiment of the present invention.

  As shown in this figure, the water vapor electrolysis apparatus has at least one cylindrical water vapor electrolysis cell 51 and a container 40 that stores the cylindrical water vapor electrolysis cell 51.

  The cylindrical steam electrolysis cell 51 is composed of a cylindrical electrolysis cell having one end closed and the other end open. The inside of this cell is formed from the oxygen electrode 31. The outside of the cell is formed from a hydrogen electrode 21. An electrolyte layer 45 having electronic insulation and oxygen ion conductivity is interposed between the hydrogen electrode 21 and the oxygen electrode 31.

  On the other hand, an oxygen atmosphere supply chamber 46 for supplying an oxygen atmosphere 47 to the oxygen electrode 31 of the cylindrical steam electrolysis cell 51 is provided at the lower part of the container 40. The oxygen atmosphere 47 in the oxygen atmosphere supply chamber 46 is introduced into the cylindrical steam electrolysis cell 1 through the oxygen atmosphere supply pipe 50. A generated oxygen discharge chamber 48 for taking out oxygen generated in the oxygen electrode 31 out of the system is provided in the middle portion of the container 40 adjacent to the oxygen atmosphere supply chamber 46. In addition, a hydrogen generation chamber 49 for taking out hydrogen 42 generated from the water vapor 41 at the hydrogen electrode of the cylindrical water vapor electrolysis cell 1 is provided in the upper part of the container 40. A partition wall 6 a is provided between the generated oxygen discharge chamber 48 and the hydrogen generation chamber 49.

  The partition wall 6a and the cylindrical steam electrolysis cell 51a may be directly joined structurally and electrically as shown on the left side of the figure. In addition, as shown on the right side of the figure, it may be structurally and electrically indirectly joined through a support tube 7 having a thermal expansion coefficient equivalent to that of the cylindrical steam electrolysis cell 51b. However, in any case, the gas inside and outside the cell does not leak to each other at the junction, the hydrogen electrode 21 and the partition wall 6a of the cylindrical steam electrolysis cell 51 are electrically insulated, When the support tube 7 is used, it is necessary that the inside and outside of the support tube 7 are insulated.

  In addition, an insulating layer 8 is provided to electrically insulate at least a part of the wall surface of the hydrogen generation chamber 49 from the generated oxygen discharge chamber 48 and the partition wall 6 a of the hydrogen generation chamber 49. By providing this insulating layer 8, an electrolytic current can be passed through both electrodes of the cylindrical steam electrolysis cell 1 with a simple reaction vessel structure.

The oxygen electrode 31 inside the cylindrical steam electrolysis cell 1 is in contact with an oxygen atmosphere supply pipe 50 inserted into the cylindrical steam electrolysis cell 51 via the elastic power supply terminal 22. The hydrogen electrode 21 outside the cylindrical steam electrolysis cell 51 is in contact with the guide plate 10 via the elastic power supply terminal 32. For example, platinum, silver, or nickel processed into a spring shape is used for the elastic power supply terminal 22 and the elastic power supply terminal 32. In addition to the spring-like structure, the above-described material processed into a mesh or felt shape may be used.

  Further, the elastic power supply terminal 22 does not hinder the relative position change between the cylindrical steam electrolysis cell 51 and the oxygen atmosphere supply pipe 50 due to the flow of oxygen gas inside the cylindrical steam electrolysis cell 51 and the temperature change. The gaps may be provided radially from the center of the cylindrical steam electrolysis cell 51.

  Further, by using the oxygen atmosphere supply pipe 50 as a conductive material, the oxygen electrode 31 of the cylindrical steam electrolysis cell 51 is secured in electrical contact by two current supply paths of the partition wall 6a and the oxygen atmosphere supply pipe 50. In addition, since the fixation of the cylindrical steam electrolysis cell 51 is performed at two points, that is, the tip portion and the root portion, the structural stability can be improved.

  Further, by replacing a part of the oxygen atmosphere supply pipe 50 connected to the partition wall 44a between the oxygen atmosphere supply chamber 46 and the generated oxygen discharge chamber 48 with an elastic structure 9 having elasticity, material deformation at the time of assembling and at a high temperature, etc. The cylindrical steam electrolysis cell 1 can be effectively prevented from being damaged. The elastic structure 9 can be formed of a metal tube processed by bellows, a metal tube bent by a spiral, or the like.

  Further, the side surface of the cylindrical steam electrolysis cell 51 can be supported by the guide plate 10 provided on the wall surface of the oxygen generation chamber 5 insulated from the partition wall 6a by the insulating layer 8. By providing the guide plate 10, the hydrogen electrode 21 on the side surface of the cylindrical steam electrolysis cell 51 can be brought into mechanical and electrical contact via the elastic power supply terminal 32. As the elastic power supply terminal 32, for example, platinum, silver, or oxidation-resistant metal processed into a spring shape can be used. In addition to the spring-like structure, the material processed into a mesh or felt may be used. With these structures, the position of the cylindrical steam electrolysis cell 1 is fixed from the outside to prevent mechanical shock / breakage due to contact with the outer member of the cylindrical steam electrolysis cell 51, and the electrical property on the hydrogen electrode 21 side is prevented. Contact can be ensured.

  According to the present embodiment, the oxygen electrode 31 maintains a sealing function from the container wall surface, and the hydrogen electrode 21 is another wall surface insulated from the container wall surface electrically connected to the oxygen electrode 31. By flowing an electrolysis current from the power supply terminal through the power supply terminal, gas leakage between hydrogen and oxygen can be prevented with a simple structure. In addition, the electrolytic current can be supplied to the cell electrode uniformly and stably over a long period of time at a high temperature and in an oxidizing / reducing atmosphere. Furthermore, high temperature steam electrolysis can be performed efficiently and stably while preventing damage to the cell due to material deformation at the time of assembly and at high temperatures.

  Furthermore, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention by combining the embodiments of the present invention. it can.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view which shows schematic structure of the high temperature steam electrolysis apparatus of the 1st Embodiment of this invention. The longitudinal cross-sectional view which shows schematic structure of the high temperature steam electrolyzer of the 2nd Embodiment of this invention. The longitudinal cross-sectional view which shows schematic structure of the conventional high temperature steam electrolysis apparatus. FIG. 4 is a longitudinal sectional view showing a schematic structure of a current lead portion in FIG. 3.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Cylindrical steam electrolysis cell, 2 ... Steam supply chamber, 3 ... Steam supply pipe, 4 ... Production hydrogen discharge chamber, 5 ... Oxygen production chamber, 6 ... Partition between production hydrogen exhaust chamber and oxygen production chamber, 6a ... Production Separation of oxygen discharge chamber and hydrogen generation chamber, 7 ... support pipe, 8 ... insulating layer, 9 ... elastic structure, 10 ... guide plate, 21 ... hydrogen electrode, 22 ... elastic feeding terminal, 31 ... oxygen electrode, 32 ... Elastic power supply terminal, 40 ... container, 41 ... water vapor, 42 ... hydrogen, 43 ... oxygen, 44 ... partition wall between water vapor supply chamber and product hydrogen discharge chamber, 44a ... partition wall between oxygen atmosphere supply chamber and product oxygen discharge chamber, 45 ... electrolyte layer, 46 ... oxygen atmosphere supply chamber, 47 ... oxygen atmosphere, 48 ... generated oxygen discharge chamber, 49 ... hydrogen generation chamber, 50 ... oxygen atmosphere supply pipe.

Claims (8)

A hydrogen electrode that closes one end and forms a cylindrical inner side, a cylindrical oxygen electrode provided outside the hydrogen electrode, and an electronic insulating property and oxygen ion conductivity provided between the hydrogen electrode and the oxygen electrode An electrolyte layer having: at least one cylindrical steam electrolysis cell having:
A steam supply chamber for supplying steam to the hydrogen electrode of the cylindrical steam electrolysis cell;
A steam supply pipe for supplying the steam in the steam supply chamber to the inside of the cylindrical steam electrolysis cell;
A generated hydrogen discharge chamber adjacent to the water vapor supply chamber for taking out the hydrogen generated at the hydrogen electrode out of the system;
An oxygen generation chamber for taking out oxygen generated on the oxygen electrode side adjacent to the generated hydrogen discharge chamber;
An elastic power supply terminal for supplying and fixing an electrolytic current to the inside and the outside of the cylindrical steam electrolysis cell;
With
Conductivity is provided to the wall surfaces of the water vapor supply chamber and the oxygen generation chamber, and an insulating layer is provided between the water vapor supply chamber and the oxygen generation chamber. Comprising an electrolytic current supply means for supplying an electrolytic current to the hydrogen electrode and oxygen electrode of the cylindrical steam electrolysis cell;
And The partition wall that isolates the generation hydrogen discharge chamber and oxygen generating chamber the cylindrical steam electrolysis cell, structurally and electrically indirectly via a support tube having a thermal expansion coefficient equivalent to that of the cylindrical steam electrolytic cell A high temperature steam electrolyzer characterized by the fact that they are joined together.   The insulating layer electrically insulates the wall surface of the oxygen generation chamber to which the elastic electrode terminal on the oxygen electrode side is connected and the wall surface of the water vapor supply chamber to which the elastic electrode terminal on the hydrogen electrode side is connected. The high-temperature steam electrolyzer according to claim 1, wherein   The elastic power supply terminal is an elastic power supply terminal having elasticity and electronic conductivity that contacts the inside of the cylindrical steam electrolysis cell and the outside of the water vapor supply pipe, and the water supply pipe is connected to the water supply chamber and the generated hydrogen. The high-temperature steam electrolysis apparatus according to claim 1 or 2, further comprising an elastic structure provided at a portion connected to a partition wall separated from the discharge chamber. The elastic power supply terminal is an elastic power supply terminal having elasticity and electronic conductivity that is provided in the oxygen generation chamber and contacts an oxygen electrode outside the cylindrical steam electrolysis cell, and is installed on the wall surface of the oxygen generation chamber The high-temperature steam electrolysis apparatus according to claim 1 or 2 , further comprising a conductive guide plate that supports the cylindrical steam electrolysis cell via the power supply terminal. An oxygen electrode that closes one end and forms a cylindrical inner side, a cylindrical hydrogen electrode that is provided outside the oxygen electrode, and an electronic insulating property and oxygen ion conductivity that are provided between the oxygen electrode and the hydrogen electrode. An electrolyte layer having: at least one cylindrical steam electrolysis cell having:
An oxygen electrode atmosphere supply chamber for adjusting the oxygen electrode atmosphere of the cylindrical steam electrolysis cell;
An oxygen electrode atmosphere supply pipe for supplying the oxygen electrode atmosphere in the oxygen electrode atmosphere supply chamber to the inside of the cylindrical steam electrolysis cell;
A generated oxygen discharge chamber for taking out oxygen generated at the oxygen electrode adjacent to the oxygen electrode atmosphere supply chamber;
A hydrogen generating chamber for taking out hydrogen generated on the hydrogen electrode side adjacent to the generated oxygen discharge chamber, and
An elastic power supply terminal for supplying and fixing an electrolytic current to the inside and the outside of the cylindrical steam electrolysis cell;
With
The walls of the oxygen atmosphere supply chamber and the hydrogen generation chamber are made conductive, and an insulating layer is provided between the oxygen atmosphere supply chamber and the hydrogen generation chamber, so that the walls of the oxygen atmosphere supply chamber and the hydrogen generation chamber are provided. An electrolysis current supply means for supplying electrolysis current to the oxygen electrode and the hydrogen electrode of the cylindrical steam electrolysis cell through
And The partition wall that isolates the generation oxygen discharge chamber and the hydrogen generation chamber the cylindrical steam electrolysis cell, structurally and electrically indirectly via a support tube having a thermal expansion coefficient equivalent to that of the cylindrical steam electrolytic cell High-temperature steam electrolysis apparatus characterized by jointing.   The insulating layer electrically insulates the wall surface of the hydrogen generation chamber to which the elastic feed terminal on the hydrogen electrode side is connected and the wall surface of the generated oxygen discharge chamber to which the elastic feed terminal on the oxygen electrode side is connected. The high-temperature steam electrolysis apparatus according to claim 5, wherein   The elastic power supply terminal is an elastic power supply terminal having elasticity and electronic conductivity for contacting the inside of the cylindrical steam electrolysis cell and the outside of the oxygen electrode atmosphere supply pipe, and the oxygen electrode atmosphere supply pipe is connected to the oxygen electrode 7. The high-temperature steam electrolysis apparatus according to claim 5, further comprising an elastic structure provided at a portion connected to a partition wall that is separated into an atmosphere supply chamber and a product oxygen discharge chamber. The elastic power supply terminal is an elastic power supply terminal having elasticity and electronic conductivity that is provided in the hydrogen generation chamber and is in contact with a hydrogen electrode outside the cylindrical steam electrolysis cell, and is installed on a wall surface of the hydrogen generation chamber The high temperature steam electrolysis apparatus according to claim 5 or 6 , further comprising a conductive guide plate that supports the cylindrical steam electrolysis cell via the power supply terminal.

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